19 files changed, 7814 insertions, 0 deletions

diff --git a/kernel/arch/arm/common/Kconfig b/kernel/arch/arm/common/Kconfig
new file mode 100644
index 000000000..c3a4e9ceb
--- /dev/null
+++ b/kernel/arch/arm/common/Kconfig
@@ -0,0 +1,22 @@
+config ICST
+	bool
+
+config SA1111
+	bool
+	select DMABOUNCE if !ARCH_PXA
+
+config DMABOUNCE
+	bool
+	select ZONE_DMA
+
+config SHARP_LOCOMO
+	bool
+
+config SHARP_PARAM
+	bool
+
+config SHARP_SCOOP
+	bool
+
+config TI_PRIV_EDMA
+	bool
diff --git a/kernel/arch/arm/common/Makefile b/kernel/arch/arm/common/Makefile
new file mode 100644
index 000000000..70b1eff47
--- /dev/null
+++ b/kernel/arch/arm/common/Makefile
@@ -0,0 +1,21 @@
+#
+# Makefile for the linux kernel.
+#
+
+obj-y				+= firmware.o
+
+obj-$(CONFIG_ICST)		+= icst.o
+obj-$(CONFIG_SA1111)		+= sa1111.o
+obj-$(CONFIG_DMABOUNCE)		+= dmabounce.o
+obj-$(CONFIG_SHARP_LOCOMO)	+= locomo.o
+obj-$(CONFIG_SHARP_PARAM)	+= sharpsl_param.o
+obj-$(CONFIG_SHARP_SCOOP)	+= scoop.o
+obj-$(CONFIG_PCI_HOST_ITE8152)  += it8152.o
+obj-$(CONFIG_ARM_TIMER_SP804)	+= timer-sp.o
+obj-$(CONFIG_MCPM)		+= mcpm_head.o mcpm_entry.o mcpm_platsmp.o vlock.o
+CFLAGS_REMOVE_mcpm_entry.o	= -pg
+AFLAGS_mcpm_head.o		:= -march=armv7-a
+AFLAGS_vlock.o			:= -march=armv7-a
+obj-$(CONFIG_TI_PRIV_EDMA)	+= edma.o
+obj-$(CONFIG_BL_SWITCHER)	+= bL_switcher.o
+obj-$(CONFIG_BL_SWITCHER_DUMMY_IF) += bL_switcher_dummy_if.o
diff --git a/kernel/arch/arm/common/bL_switcher.c b/kernel/arch/arm/common/bL_switcher.c
new file mode 100644
index 000000000..37dc0fe10
--- /dev/null
+++ b/kernel/arch/arm/common/bL_switcher.c
@@ -0,0 +1,802 @@
+/*
+ * arch/arm/common/bL_switcher.c -- big.LITTLE cluster switcher core driver
+ *
+ * Created by:	Nicolas Pitre, March 2012
+ * Copyright:	(C) 2012-2013  Linaro Limited
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/atomic.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/cpu_pm.h>
+#include <linux/cpu.h>
+#include <linux/cpumask.h>
+#include <linux/kthread.h>
+#include <linux/wait.h>
+#include <linux/time.h>
+#include <linux/clockchips.h>
+#include <linux/hrtimer.h>
+#include <linux/tick.h>
+#include <linux/notifier.h>
+#include <linux/mm.h>
+#include <linux/mutex.h>
+#include <linux/smp.h>
+#include <linux/spinlock.h>
+#include <linux/string.h>
+#include <linux/sysfs.h>
+#include <linux/irqchip/arm-gic.h>
+#include <linux/moduleparam.h>
+
+#include <asm/smp_plat.h>
+#include <asm/cputype.h>
+#include <asm/suspend.h>
+#include <asm/mcpm.h>
+#include <asm/bL_switcher.h>
+
+#define CREATE_TRACE_POINTS
+#include <trace/events/power_cpu_migrate.h>
+
+
+/*
+ * Use our own MPIDR accessors as the generic ones in asm/cputype.h have
+ * __attribute_const__ and we don't want the compiler to assume any
+ * constness here as the value _does_ change along some code paths.
+ */
+
+static int read_mpidr(void)
+{
+	unsigned int id;
+	asm volatile ("mrc p15, 0, %0, c0, c0, 5" : "=r" (id));
+	return id & MPIDR_HWID_BITMASK;
+}
+
+/*
+ * bL switcher core code.
+ */
+
+static void bL_do_switch(void *_arg)
+{
+	unsigned ib_mpidr, ib_cpu, ib_cluster;
+	long volatile handshake, **handshake_ptr = _arg;
+
+	pr_debug("%s\n", __func__);
+
+	ib_mpidr = cpu_logical_map(smp_processor_id());
+	ib_cpu = MPIDR_AFFINITY_LEVEL(ib_mpidr, 0);
+	ib_cluster = MPIDR_AFFINITY_LEVEL(ib_mpidr, 1);
+
+	/* Advertise our handshake location */
+	if (handshake_ptr) {
+		handshake = 0;
+		*handshake_ptr = &handshake;
+	} else
+		handshake = -1;
+
+	/*
+	 * Our state has been saved at this point.  Let's release our
+	 * inbound CPU.
+	 */
+	mcpm_set_entry_vector(ib_cpu, ib_cluster, cpu_resume);
+	sev();
+
+	/*
+	 * From this point, we must assume that our counterpart CPU might
+	 * have taken over in its parallel world already, as if execution
+	 * just returned from cpu_suspend().  It is therefore important to
+	 * be very careful not to make any change the other guy is not
+	 * expecting.  This is why we need stack isolation.
+	 *
+	 * Fancy under cover tasks could be performed here.  For now
+	 * we have none.
+	 */
+
+	/*
+	 * Let's wait until our inbound is alive.
+	 */
+	while (!handshake) {
+		wfe();
+		smp_mb();
+	}
+
+	/* Let's put ourself down. */
+	mcpm_cpu_power_down();
+
+	/* should never get here */
+	BUG();
+}
+
+/*
+ * Stack isolation.  To ensure 'current' remains valid, we just use another
+ * piece of our thread's stack space which should be fairly lightly used.
+ * The selected area starts just above the thread_info structure located
+ * at the very bottom of the stack, aligned to a cache line, and indexed
+ * with the cluster number.
+ */
+#define STACK_SIZE 512
+extern void call_with_stack(void (*fn)(void *), void *arg, void *sp);
+static int bL_switchpoint(unsigned long _arg)
+{
+	unsigned int mpidr = read_mpidr();
+	unsigned int clusterid = MPIDR_AFFINITY_LEVEL(mpidr, 1);
+	void *stack = current_thread_info() + 1;
+	stack = PTR_ALIGN(stack, L1_CACHE_BYTES);
+	stack += clusterid * STACK_SIZE + STACK_SIZE;
+	call_with_stack(bL_do_switch, (void *)_arg, stack);
+	BUG();
+}
+
+/*
+ * Generic switcher interface
+ */
+
+static unsigned int bL_gic_id[MAX_CPUS_PER_CLUSTER][MAX_NR_CLUSTERS];
+static int bL_switcher_cpu_pairing[NR_CPUS];
+
+/*
+ * bL_switch_to - Switch to a specific cluster for the current CPU
+ * @new_cluster_id: the ID of the cluster to switch to.
+ *
+ * This function must be called on the CPU to be switched.
+ * Returns 0 on success, else a negative status code.
+ */
+static int bL_switch_to(unsigned int new_cluster_id)
+{
+	unsigned int mpidr, this_cpu, that_cpu;
+	unsigned int ob_mpidr, ob_cpu, ob_cluster, ib_mpidr, ib_cpu, ib_cluster;
+	struct completion inbound_alive;
+	long volatile *handshake_ptr;
+	int ipi_nr, ret;
+
+	this_cpu = smp_processor_id();
+	ob_mpidr = read_mpidr();
+	ob_cpu = MPIDR_AFFINITY_LEVEL(ob_mpidr, 0);
+	ob_cluster = MPIDR_AFFINITY_LEVEL(ob_mpidr, 1);
+	BUG_ON(cpu_logical_map(this_cpu) != ob_mpidr);
+
+	if (new_cluster_id == ob_cluster)
+		return 0;
+
+	that_cpu = bL_switcher_cpu_pairing[this_cpu];
+	ib_mpidr = cpu_logical_map(that_cpu);
+	ib_cpu = MPIDR_AFFINITY_LEVEL(ib_mpidr, 0);
+	ib_cluster = MPIDR_AFFINITY_LEVEL(ib_mpidr, 1);
+
+	pr_debug("before switch: CPU %d MPIDR %#x -> %#x\n",
+		 this_cpu, ob_mpidr, ib_mpidr);
+
+	this_cpu = smp_processor_id();
+
+	/* Close the gate for our entry vectors */
+	mcpm_set_entry_vector(ob_cpu, ob_cluster, NULL);
+	mcpm_set_entry_vector(ib_cpu, ib_cluster, NULL);
+
+	/* Install our "inbound alive" notifier. */
+	init_completion(&inbound_alive);
+	ipi_nr = register_ipi_completion(&inbound_alive, this_cpu);
+	ipi_nr |= ((1 << 16) << bL_gic_id[ob_cpu][ob_cluster]);
+	mcpm_set_early_poke(ib_cpu, ib_cluster, gic_get_sgir_physaddr(), ipi_nr);
+
+	/*
+	 * Let's wake up the inbound CPU now in case it requires some delay
+	 * to come online, but leave it gated in our entry vector code.
+	 */
+	ret = mcpm_cpu_power_up(ib_cpu, ib_cluster);
+	if (ret) {
+		pr_err("%s: mcpm_cpu_power_up() returned %d\n", __func__, ret);
+		return ret;
+	}
+
+	/*
+	 * Raise a SGI on the inbound CPU to make sure it doesn't stall
+	 * in a possible WFI, such as in bL_power_down().
+	 */
+	gic_send_sgi(bL_gic_id[ib_cpu][ib_cluster], 0);
+
+	/*
+	 * Wait for the inbound to come up.  This allows for other
+	 * tasks to be scheduled in the mean time.
+	 */
+	wait_for_completion(&inbound_alive);
+	mcpm_set_early_poke(ib_cpu, ib_cluster, 0, 0);
+
+	/*
+	 * From this point we are entering the switch critical zone
+	 * and can't take any interrupts anymore.
+	 */
+	local_irq_disable();
+	local_fiq_disable();
+	trace_cpu_migrate_begin(ktime_get_real_ns(), ob_mpidr);
+
+	/* redirect GIC's SGIs to our counterpart */
+	gic_migrate_target(bL_gic_id[ib_cpu][ib_cluster]);
+
+	tick_suspend_local();
+
+	ret = cpu_pm_enter();
+
+	/* we can not tolerate errors at this point */
+	if (ret)
+		panic("%s: cpu_pm_enter() returned %d\n", __func__, ret);
+
+	/* Swap the physical CPUs in the logical map for this logical CPU. */
+	cpu_logical_map(this_cpu) = ib_mpidr;
+	cpu_logical_map(that_cpu) = ob_mpidr;
+
+	/* Let's do the actual CPU switch. */
+	ret = cpu_suspend((unsigned long)&handshake_ptr, bL_switchpoint);
+	if (ret > 0)
+		panic("%s: cpu_suspend() returned %d\n", __func__, ret);
+
+	/* We are executing on the inbound CPU at this point */
+	mpidr = read_mpidr();
+	pr_debug("after switch: CPU %d MPIDR %#x\n", this_cpu, mpidr);
+	BUG_ON(mpidr != ib_mpidr);
+
+	mcpm_cpu_powered_up();
+
+	ret = cpu_pm_exit();
+
+	tick_resume_local();
+
+	trace_cpu_migrate_finish(ktime_get_real_ns(), ib_mpidr);
+	local_fiq_enable();
+	local_irq_enable();
+
+	*handshake_ptr = 1;
+	dsb_sev();
+
+	if (ret)
+		pr_err("%s exiting with error %d\n", __func__, ret);
+	return ret;
+}
+
+struct bL_thread {
+	spinlock_t lock;
+	struct task_struct *task;
+	wait_queue_head_t wq;
+	int wanted_cluster;
+	struct completion started;
+	bL_switch_completion_handler completer;
+	void *completer_cookie;
+};
+
+static struct bL_thread bL_threads[NR_CPUS];
+
+static int bL_switcher_thread(void *arg)
+{
+	struct bL_thread *t = arg;
+	struct sched_param param = { .sched_priority = 1 };
+	int cluster;
+	bL_switch_completion_handler completer;
+	void *completer_cookie;
+
+	sched_setscheduler_nocheck(current, SCHED_FIFO, &param);
+	complete(&t->started);
+
+	do {
+		if (signal_pending(current))
+			flush_signals(current);
+		wait_event_interruptible(t->wq,
+				t->wanted_cluster != -1 ||
+				kthread_should_stop());
+
+		spin_lock(&t->lock);
+		cluster = t->wanted_cluster;
+		completer = t->completer;
+		completer_cookie = t->completer_cookie;
+		t->wanted_cluster = -1;
+		t->completer = NULL;
+		spin_unlock(&t->lock);
+
+		if (cluster != -1) {
+			bL_switch_to(cluster);
+
+			if (completer)
+				completer(completer_cookie);
+		}
+	} while (!kthread_should_stop());
+
+	return 0;
+}
+
+static struct task_struct *bL_switcher_thread_create(int cpu, void *arg)
+{
+	struct task_struct *task;
+
+	task = kthread_create_on_node(bL_switcher_thread, arg,
+				      cpu_to_node(cpu), "kswitcher_%d", cpu);
+	if (!IS_ERR(task)) {
+		kthread_bind(task, cpu);
+		wake_up_process(task);
+	} else
+		pr_err("%s failed for CPU %d\n", __func__, cpu);
+	return task;
+}
+
+/*
+ * bL_switch_request_cb - Switch to a specific cluster for the given CPU,
+ *      with completion notification via a callback
+ *
+ * @cpu: the CPU to switch
+ * @new_cluster_id: the ID of the cluster to switch to.
+ * @completer: switch completion callback.  if non-NULL,
+ *	@completer(@completer_cookie) will be called on completion of
+ *	the switch, in non-atomic context.
+ * @completer_cookie: opaque context argument for @completer.
+ *
+ * This function causes a cluster switch on the given CPU by waking up
+ * the appropriate switcher thread.  This function may or may not return
+ * before the switch has occurred.
+ *
+ * If a @completer callback function is supplied, it will be called when
+ * the switch is complete.  This can be used to determine asynchronously
+ * when the switch is complete, regardless of when bL_switch_request()
+ * returns.  When @completer is supplied, no new switch request is permitted
+ * for the affected CPU until after the switch is complete, and @completer
+ * has returned.
+ */
+int bL_switch_request_cb(unsigned int cpu, unsigned int new_cluster_id,
+			 bL_switch_completion_handler completer,
+			 void *completer_cookie)
+{
+	struct bL_thread *t;
+
+	if (cpu >= ARRAY_SIZE(bL_threads)) {
+		pr_err("%s: cpu %d out of bounds\n", __func__, cpu);
+		return -EINVAL;
+	}
+
+	t = &bL_threads[cpu];
+
+	if (IS_ERR(t->task))
+		return PTR_ERR(t->task);
+	if (!t->task)
+		return -ESRCH;
+
+	spin_lock(&t->lock);
+	if (t->completer) {
+		spin_unlock(&t->lock);
+		return -EBUSY;
+	}
+	t->completer = completer;
+	t->completer_cookie = completer_cookie;
+	t->wanted_cluster = new_cluster_id;
+	spin_unlock(&t->lock);
+	wake_up(&t->wq);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(bL_switch_request_cb);
+
+/*
+ * Activation and configuration code.
+ */
+
+static DEFINE_MUTEX(bL_switcher_activation_lock);
+static BLOCKING_NOTIFIER_HEAD(bL_activation_notifier);
+static unsigned int bL_switcher_active;
+static unsigned int bL_switcher_cpu_original_cluster[NR_CPUS];
+static cpumask_t bL_switcher_removed_logical_cpus;
+
+int bL_switcher_register_notifier(struct notifier_block *nb)
+{
+	return blocking_notifier_chain_register(&bL_activation_notifier, nb);
+}
+EXPORT_SYMBOL_GPL(bL_switcher_register_notifier);
+
+int bL_switcher_unregister_notifier(struct notifier_block *nb)
+{
+	return blocking_notifier_chain_unregister(&bL_activation_notifier, nb);
+}
+EXPORT_SYMBOL_GPL(bL_switcher_unregister_notifier);
+
+static int bL_activation_notify(unsigned long val)
+{
+	int ret;
+
+	ret = blocking_notifier_call_chain(&bL_activation_notifier, val, NULL);
+	if (ret & NOTIFY_STOP_MASK)
+		pr_err("%s: notifier chain failed with status 0x%x\n",
+			__func__, ret);
+	return notifier_to_errno(ret);
+}
+
+static void bL_switcher_restore_cpus(void)
+{
+	int i;
+
+	for_each_cpu(i, &bL_switcher_removed_logical_cpus) {
+		struct device *cpu_dev = get_cpu_device(i);
+		int ret = device_online(cpu_dev);
+		if (ret)
+			dev_err(cpu_dev, "switcher: unable to restore CPU\n");
+	}
+}
+
+static int bL_switcher_halve_cpus(void)
+{
+	int i, j, cluster_0, gic_id, ret;
+	unsigned int cpu, cluster, mask;
+	cpumask_t available_cpus;
+
+	/* First pass to validate what we have */
+	mask = 0;
+	for_each_online_cpu(i) {
+		cpu = MPIDR_AFFINITY_LEVEL(cpu_logical_map(i), 0);
+		cluster = MPIDR_AFFINITY_LEVEL(cpu_logical_map(i), 1);
+		if (cluster >= 2) {
+			pr_err("%s: only dual cluster systems are supported\n", __func__);
+			return -EINVAL;
+		}
+		if (WARN_ON(cpu >= MAX_CPUS_PER_CLUSTER))
+			return -EINVAL;
+		mask |= (1 << cluster);
+	}
+	if (mask != 3) {
+		pr_err("%s: no CPU pairing possible\n", __func__);
+		return -EINVAL;
+	}
+
+	/*
+	 * Now let's do the pairing.  We match each CPU with another CPU
+	 * from a different cluster.  To get a uniform scheduling behavior
+	 * without fiddling with CPU topology and compute capacity data,
+	 * we'll use logical CPUs initially belonging to the same cluster.
+	 */
+	memset(bL_switcher_cpu_pairing, -1, sizeof(bL_switcher_cpu_pairing));
+	cpumask_copy(&available_cpus, cpu_online_mask);
+	cluster_0 = -1;
+	for_each_cpu(i, &available_cpus) {
+		int match = -1;
+		cluster = MPIDR_AFFINITY_LEVEL(cpu_logical_map(i), 1);
+		if (cluster_0 == -1)
+			cluster_0 = cluster;
+		if (cluster != cluster_0)
+			continue;
+		cpumask_clear_cpu(i, &available_cpus);
+		for_each_cpu(j, &available_cpus) {
+			cluster = MPIDR_AFFINITY_LEVEL(cpu_logical_map(j), 1);
+			/*
+			 * Let's remember the last match to create "odd"
+			 * pairings on purpose in order for other code not
+			 * to assume any relation between physical and
+			 * logical CPU numbers.
+			 */
+			if (cluster != cluster_0)
+				match = j;
+		}
+		if (match != -1) {
+			bL_switcher_cpu_pairing[i] = match;
+			cpumask_clear_cpu(match, &available_cpus);
+			pr_info("CPU%d paired with CPU%d\n", i, match);
+		}
+	}
+
+	/*
+	 * Now we disable the unwanted CPUs i.e. everything that has no
+	 * pairing information (that includes the pairing counterparts).
+	 */
+	cpumask_clear(&bL_switcher_removed_logical_cpus);
+	for_each_online_cpu(i) {
+		cpu = MPIDR_AFFINITY_LEVEL(cpu_logical_map(i), 0);
+		cluster = MPIDR_AFFINITY_LEVEL(cpu_logical_map(i), 1);
+
+		/* Let's take note of the GIC ID for this CPU */
+		gic_id = gic_get_cpu_id(i);
+		if (gic_id < 0) {
+			pr_err("%s: bad GIC ID for CPU %d\n", __func__, i);
+			bL_switcher_restore_cpus();
+			return -EINVAL;
+		}
+		bL_gic_id[cpu][cluster] = gic_id;
+		pr_info("GIC ID for CPU %u cluster %u is %u\n",
+			cpu, cluster, gic_id);
+
+		if (bL_switcher_cpu_pairing[i] != -1) {
+			bL_switcher_cpu_original_cluster[i] = cluster;
+			continue;
+		}
+
+		ret = device_offline(get_cpu_device(i));
+		if (ret) {
+			bL_switcher_restore_cpus();
+			return ret;
+		}
+		cpumask_set_cpu(i, &bL_switcher_removed_logical_cpus);
+	}
+
+	return 0;
+}
+
+/* Determine the logical CPU a given physical CPU is grouped on. */
+int bL_switcher_get_logical_index(u32 mpidr)
+{
+	int cpu;
+
+	if (!bL_switcher_active)
+		return -EUNATCH;
+
+	mpidr &= MPIDR_HWID_BITMASK;
+	for_each_online_cpu(cpu) {
+		int pairing = bL_switcher_cpu_pairing[cpu];
+		if (pairing == -1)
+			continue;
+		if ((mpidr == cpu_logical_map(cpu)) ||
+		    (mpidr == cpu_logical_map(pairing)))
+			return cpu;
+	}
+	return -EINVAL;
+}
+
+static void bL_switcher_trace_trigger_cpu(void *__always_unused info)
+{
+	trace_cpu_migrate_current(ktime_get_real_ns(), read_mpidr());
+}
+
+int bL_switcher_trace_trigger(void)
+{
+	int ret;
+
+	preempt_disable();
+
+	bL_switcher_trace_trigger_cpu(NULL);
+	ret = smp_call_function(bL_switcher_trace_trigger_cpu, NULL, true);
+
+	preempt_enable();
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(bL_switcher_trace_trigger);
+
+static int bL_switcher_enable(void)
+{
+	int cpu, ret;
+
+	mutex_lock(&bL_switcher_activation_lock);
+	lock_device_hotplug();
+	if (bL_switcher_active) {
+		unlock_device_hotplug();
+		mutex_unlock(&bL_switcher_activation_lock);
+		return 0;
+	}
+
+	pr_info("big.LITTLE switcher initializing\n");
+
+	ret = bL_activation_notify(BL_NOTIFY_PRE_ENABLE);
+	if (ret)
+		goto error;
+
+	ret = bL_switcher_halve_cpus();
+	if (ret)
+		goto error;
+
+	bL_switcher_trace_trigger();
+
+	for_each_online_cpu(cpu) {
+		struct bL_thread *t = &bL_threads[cpu];
+		spin_lock_init(&t->lock);
+		init_waitqueue_head(&t->wq);
+		init_completion(&t->started);
+		t->wanted_cluster = -1;
+		t->task = bL_switcher_thread_create(cpu, t);
+	}
+
+	bL_switcher_active = 1;
+	bL_activation_notify(BL_NOTIFY_POST_ENABLE);
+	pr_info("big.LITTLE switcher initialized\n");
+	goto out;
+
+error:
+	pr_warn("big.LITTLE switcher initialization failed\n");
+	bL_activation_notify(BL_NOTIFY_POST_DISABLE);
+
+out:
+	unlock_device_hotplug();
+	mutex_unlock(&bL_switcher_activation_lock);
+	return ret;
+}
+
+#ifdef CONFIG_SYSFS
+
+static void bL_switcher_disable(void)
+{
+	unsigned int cpu, cluster;
+	struct bL_thread *t;
+	struct task_struct *task;
+
+	mutex_lock(&bL_switcher_activation_lock);
+	lock_device_hotplug();
+
+	if (!bL_switcher_active)
+		goto out;
+
+	if (bL_activation_notify(BL_NOTIFY_PRE_DISABLE) != 0) {
+		bL_activation_notify(BL_NOTIFY_POST_ENABLE);
+		goto out;
+	}
+
+	bL_switcher_active = 0;
+
+	/*
+	 * To deactivate the switcher, we must shut down the switcher
+	 * threads to prevent any other requests from being accepted.
+	 * Then, if the final cluster for given logical CPU is not the
+	 * same as the original one, we'll recreate a switcher thread
+	 * just for the purpose of switching the CPU back without any
+	 * possibility for interference from external requests.
+	 */
+	for_each_online_cpu(cpu) {
+		t = &bL_threads[cpu];
+		task = t->task;
+		t->task = NULL;
+		if (!task || IS_ERR(task))
+			continue;
+		kthread_stop(task);
+		/* no more switch may happen on this CPU at this point */
+		cluster = MPIDR_AFFINITY_LEVEL(cpu_logical_map(cpu), 1);
+		if (cluster == bL_switcher_cpu_original_cluster[cpu])
+			continue;
+		init_completion(&t->started);
+		t->wanted_cluster = bL_switcher_cpu_original_cluster[cpu];
+		task = bL_switcher_thread_create(cpu, t);
+		if (!IS_ERR(task)) {
+			wait_for_completion(&t->started);
+			kthread_stop(task);
+			cluster = MPIDR_AFFINITY_LEVEL(cpu_logical_map(cpu), 1);
+			if (cluster == bL_switcher_cpu_original_cluster[cpu])
+				continue;
+		}
+		/* If execution gets here, we're in trouble. */
+		pr_crit("%s: unable to restore original cluster for CPU %d\n",
+			__func__, cpu);
+		pr_crit("%s: CPU %d can't be restored\n",
+			__func__, bL_switcher_cpu_pairing[cpu]);
+		cpumask_clear_cpu(bL_switcher_cpu_pairing[cpu],
+				  &bL_switcher_removed_logical_cpus);
+	}
+
+	bL_switcher_restore_cpus();
+	bL_switcher_trace_trigger();
+
+	bL_activation_notify(BL_NOTIFY_POST_DISABLE);
+
+out:
+	unlock_device_hotplug();
+	mutex_unlock(&bL_switcher_activation_lock);
+}
+
+static ssize_t bL_switcher_active_show(struct kobject *kobj,
+		struct kobj_attribute *attr, char *buf)
+{
+	return sprintf(buf, "%u\n", bL_switcher_active);
+}
+
+static ssize_t bL_switcher_active_store(struct kobject *kobj,
+		struct kobj_attribute *attr, const char *buf, size_t count)
+{
+	int ret;
+
+	switch (buf[0]) {
+	case '0':
+		bL_switcher_disable();
+		ret = 0;
+		break;
+	case '1':
+		ret = bL_switcher_enable();
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	return (ret >= 0) ? count : ret;
+}
+
+static ssize_t bL_switcher_trace_trigger_store(struct kobject *kobj,
+		struct kobj_attribute *attr, const char *buf, size_t count)
+{
+	int ret = bL_switcher_trace_trigger();
+
+	return ret ? ret : count;
+}
+
+static struct kobj_attribute bL_switcher_active_attr =
+	__ATTR(active, 0644, bL_switcher_active_show, bL_switcher_active_store);
+
+static struct kobj_attribute bL_switcher_trace_trigger_attr =
+	__ATTR(trace_trigger, 0200, NULL, bL_switcher_trace_trigger_store);
+
+static struct attribute *bL_switcher_attrs[] = {
+	&bL_switcher_active_attr.attr,
+	&bL_switcher_trace_trigger_attr.attr,
+	NULL,
+};
+
+static struct attribute_group bL_switcher_attr_group = {
+	.attrs = bL_switcher_attrs,
+};
+
+static struct kobject *bL_switcher_kobj;
+
+static int __init bL_switcher_sysfs_init(void)
+{
+	int ret;
+
+	bL_switcher_kobj = kobject_create_and_add("bL_switcher", kernel_kobj);
+	if (!bL_switcher_kobj)
+		return -ENOMEM;
+	ret = sysfs_create_group(bL_switcher_kobj, &bL_switcher_attr_group);
+	if (ret)
+		kobject_put(bL_switcher_kobj);
+	return ret;
+}
+
+#endif  /* CONFIG_SYSFS */
+
+bool bL_switcher_get_enabled(void)
+{
+	mutex_lock(&bL_switcher_activation_lock);
+
+	return bL_switcher_active;
+}
+EXPORT_SYMBOL_GPL(bL_switcher_get_enabled);
+
+void bL_switcher_put_enabled(void)
+{
+	mutex_unlock(&bL_switcher_activation_lock);
+}
+EXPORT_SYMBOL_GPL(bL_switcher_put_enabled);
+
+/*
+ * Veto any CPU hotplug operation on those CPUs we've removed
+ * while the switcher is active.
+ * We're just not ready to deal with that given the trickery involved.
+ */
+static int bL_switcher_hotplug_callback(struct notifier_block *nfb,
+					unsigned long action, void *hcpu)
+{
+	if (bL_switcher_active) {
+		int pairing = bL_switcher_cpu_pairing[(unsigned long)hcpu];
+		switch (action & 0xf) {
+		case CPU_UP_PREPARE:
+		case CPU_DOWN_PREPARE:
+			if (pairing == -1)
+				return NOTIFY_BAD;
+		}
+	}
+	return NOTIFY_DONE;
+}
+
+static bool no_bL_switcher;
+core_param(no_bL_switcher, no_bL_switcher, bool, 0644);
+
+static int __init bL_switcher_init(void)
+{
+	int ret;
+
+	if (!mcpm_is_available())
+		return -ENODEV;
+
+	cpu_notifier(bL_switcher_hotplug_callback, 0);
+
+	if (!no_bL_switcher) {
+		ret = bL_switcher_enable();
+		if (ret)
+			return ret;
+	}
+
+#ifdef CONFIG_SYSFS
+	ret = bL_switcher_sysfs_init();
+	if (ret)
+		pr_err("%s: unable to create sysfs entry\n", __func__);
+#endif
+
+	return 0;
+}
+
+late_initcall(bL_switcher_init);
diff --git a/kernel/arch/arm/common/bL_switcher_dummy_if.c b/kernel/arch/arm/common/bL_switcher_dummy_if.c
new file mode 100644
index 000000000..3f47f1203
--- /dev/null
+++ b/kernel/arch/arm/common/bL_switcher_dummy_if.c
@@ -0,0 +1,71 @@
+/*
+ * arch/arm/common/bL_switcher_dummy_if.c -- b.L switcher dummy interface
+ *
+ * Created by:	Nicolas Pitre, November 2012
+ * Copyright:	(C) 2012-2013  Linaro Limited
+ *
+ * Dummy interface to user space for debugging purpose only.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <asm/uaccess.h>
+#include <asm/bL_switcher.h>
+
+static ssize_t bL_switcher_write(struct file *file, const char __user *buf,
+			size_t len, loff_t *pos)
+{
+	unsigned char val[3];
+	unsigned int cpu, cluster;
+	int ret;
+
+	pr_debug("%s\n", __func__);
+
+	if (len < 3)
+		return -EINVAL;
+
+	if (copy_from_user(val, buf, 3))
+		return -EFAULT;
+
+	/* format: <cpu#>,<cluster#> */
+	if (val[0] < '0' || val[0] > '9' ||
+	    val[1] != ',' ||
+	    val[2] < '0' || val[2] > '1')
+		return -EINVAL;
+
+	cpu = val[0] - '0';
+	cluster = val[2] - '0';
+	ret = bL_switch_request(cpu, cluster);
+
+	return ret ? : len;
+}
+
+static const struct file_operations bL_switcher_fops = {
+	.write		= bL_switcher_write,
+	.owner	= THIS_MODULE,
+};
+
+static struct miscdevice bL_switcher_device = {
+	MISC_DYNAMIC_MINOR,
+	"b.L_switcher",
+	&bL_switcher_fops
+};
+
+static int __init bL_switcher_dummy_if_init(void)
+{
+	return misc_register(&bL_switcher_device);
+}
+
+static void __exit bL_switcher_dummy_if_exit(void)
+{
+	misc_deregister(&bL_switcher_device);
+}
+
+module_init(bL_switcher_dummy_if_init);
+module_exit(bL_switcher_dummy_if_exit);
diff --git a/kernel/arch/arm/common/dmabounce.c b/kernel/arch/arm/common/dmabounce.c
new file mode 100644
index 000000000..1143c4d5c
--- /dev/null
+++ b/kernel/arch/arm/common/dmabounce.c
@@ -0,0 +1,579 @@
+/*
+ *  arch/arm/common/dmabounce.c
+ *
+ *  Special dma_{map/unmap/dma_sync}_* routines for systems that have
+ *  limited DMA windows. These functions utilize bounce buffers to
+ *  copy data to/from buffers located outside the DMA region. This
+ *  only works for systems in which DMA memory is at the bottom of
+ *  RAM, the remainder of memory is at the top and the DMA memory
+ *  can be marked as ZONE_DMA. Anything beyond that such as discontiguous
+ *  DMA windows will require custom implementations that reserve memory
+ *  areas at early bootup.
+ *
+ *  Original version by Brad Parker (brad@heeltoe.com)
+ *  Re-written by Christopher Hoover <ch@murgatroid.com>
+ *  Made generic by Deepak Saxena <dsaxena@plexity.net>
+ *
+ *  Copyright (C) 2002 Hewlett Packard Company.
+ *  Copyright (C) 2004 MontaVista Software, Inc.
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License
+ *  version 2 as published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/page-flags.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmapool.h>
+#include <linux/list.h>
+#include <linux/scatterlist.h>
+
+#include <asm/cacheflush.h>
+
+#undef STATS
+
+#ifdef STATS
+#define DO_STATS(X) do { X ; } while (0)
+#else
+#define DO_STATS(X) do { } while (0)
+#endif
+
+/* ************************************************** */
+
+struct safe_buffer {
+	struct list_head node;
+
+	/* original request */
+	void		*ptr;
+	size_t		size;
+	int		direction;
+
+	/* safe buffer info */
+	struct dmabounce_pool *pool;
+	void		*safe;
+	dma_addr_t	safe_dma_addr;
+};
+
+struct dmabounce_pool {
+	unsigned long	size;
+	struct dma_pool	*pool;
+#ifdef STATS
+	unsigned long	allocs;
+#endif
+};
+
+struct dmabounce_device_info {
+	struct device *dev;
+	struct list_head safe_buffers;
+#ifdef STATS
+	unsigned long total_allocs;
+	unsigned long map_op_count;
+	unsigned long bounce_count;
+	int attr_res;
+#endif
+	struct dmabounce_pool	small;
+	struct dmabounce_pool	large;
+
+	rwlock_t lock;
+
+	int (*needs_bounce)(struct device *, dma_addr_t, size_t);
+};
+
+#ifdef STATS
+static ssize_t dmabounce_show(struct device *dev, struct device_attribute *attr,
+			      char *buf)
+{
+	struct dmabounce_device_info *device_info = dev->archdata.dmabounce;
+	return sprintf(buf, "%lu %lu %lu %lu %lu %lu\n",
+		device_info->small.allocs,
+		device_info->large.allocs,
+		device_info->total_allocs - device_info->small.allocs -
+			device_info->large.allocs,
+		device_info->total_allocs,
+		device_info->map_op_count,
+		device_info->bounce_count);
+}
+
+static DEVICE_ATTR(dmabounce_stats, 0400, dmabounce_show, NULL);
+#endif
+
+
+/* allocate a 'safe' buffer and keep track of it */
+static inline struct safe_buffer *
+alloc_safe_buffer(struct dmabounce_device_info *device_info, void *ptr,
+		  size_t size, enum dma_data_direction dir)
+{
+	struct safe_buffer *buf;
+	struct dmabounce_pool *pool;
+	struct device *dev = device_info->dev;
+	unsigned long flags;
+
+	dev_dbg(dev, "%s(ptr=%p, size=%d, dir=%d)\n",
+		__func__, ptr, size, dir);
+
+	if (size <= device_info->small.size) {
+		pool = &device_info->small;
+	} else if (size <= device_info->large.size) {
+		pool = &device_info->large;
+	} else {
+		pool = NULL;
+	}
+
+	buf = kmalloc(sizeof(struct safe_buffer), GFP_ATOMIC);
+	if (buf == NULL) {
+		dev_warn(dev, "%s: kmalloc failed\n", __func__);
+		return NULL;
+	}
+
+	buf->ptr = ptr;
+	buf->size = size;
+	buf->direction = dir;
+	buf->pool = pool;
+
+	if (pool) {
+		buf->safe = dma_pool_alloc(pool->pool, GFP_ATOMIC,
+					   &buf->safe_dma_addr);
+	} else {
+		buf->safe = dma_alloc_coherent(dev, size, &buf->safe_dma_addr,
+					       GFP_ATOMIC);
+	}
+
+	if (buf->safe == NULL) {
+		dev_warn(dev,
+			 "%s: could not alloc dma memory (size=%d)\n",
+			 __func__, size);
+		kfree(buf);
+		return NULL;
+	}
+
+#ifdef STATS
+	if (pool)
+		pool->allocs++;
+	device_info->total_allocs++;
+#endif
+
+	write_lock_irqsave(&device_info->lock, flags);
+	list_add(&buf->node, &device_info->safe_buffers);
+	write_unlock_irqrestore(&device_info->lock, flags);
+
+	return buf;
+}
+
+/* determine if a buffer is from our "safe" pool */
+static inline struct safe_buffer *
+find_safe_buffer(struct dmabounce_device_info *device_info, dma_addr_t safe_dma_addr)
+{
+	struct safe_buffer *b, *rb = NULL;
+	unsigned long flags;
+
+	read_lock_irqsave(&device_info->lock, flags);
+
+	list_for_each_entry(b, &device_info->safe_buffers, node)
+		if (b->safe_dma_addr <= safe_dma_addr &&
+		    b->safe_dma_addr + b->size > safe_dma_addr) {
+			rb = b;
+			break;
+		}
+
+	read_unlock_irqrestore(&device_info->lock, flags);
+	return rb;
+}
+
+static inline void
+free_safe_buffer(struct dmabounce_device_info *device_info, struct safe_buffer *buf)
+{
+	unsigned long flags;
+
+	dev_dbg(device_info->dev, "%s(buf=%p)\n", __func__, buf);
+
+	write_lock_irqsave(&device_info->lock, flags);
+
+	list_del(&buf->node);
+
+	write_unlock_irqrestore(&device_info->lock, flags);
+
+	if (buf->pool)
+		dma_pool_free(buf->pool->pool, buf->safe, buf->safe_dma_addr);
+	else
+		dma_free_coherent(device_info->dev, buf->size, buf->safe,
+				    buf->safe_dma_addr);
+
+	kfree(buf);
+}
+
+/* ************************************************** */
+
+static struct safe_buffer *find_safe_buffer_dev(struct device *dev,
+		dma_addr_t dma_addr, const char *where)
+{
+	if (!dev || !dev->archdata.dmabounce)
+		return NULL;
+	if (dma_mapping_error(dev, dma_addr)) {
+		dev_err(dev, "Trying to %s invalid mapping\n", where);
+		return NULL;
+	}
+	return find_safe_buffer(dev->archdata.dmabounce, dma_addr);
+}
+
+static int needs_bounce(struct device *dev, dma_addr_t dma_addr, size_t size)
+{
+	if (!dev || !dev->archdata.dmabounce)
+		return 0;
+
+	if (dev->dma_mask) {
+		unsigned long limit, mask = *dev->dma_mask;
+
+		limit = (mask + 1) & ~mask;
+		if (limit && size > limit) {
+			dev_err(dev, "DMA mapping too big (requested %#x "
+				"mask %#Lx)\n", size, *dev->dma_mask);
+			return -E2BIG;
+		}
+
+		/* Figure out if we need to bounce from the DMA mask. */
+		if ((dma_addr | (dma_addr + size - 1)) & ~mask)
+			return 1;
+	}
+
+	return !!dev->archdata.dmabounce->needs_bounce(dev, dma_addr, size);
+}
+
+static inline dma_addr_t map_single(struct device *dev, void *ptr, size_t size,
+		enum dma_data_direction dir)
+{
+	struct dmabounce_device_info *device_info = dev->archdata.dmabounce;
+	struct safe_buffer *buf;
+
+	if (device_info)
+		DO_STATS ( device_info->map_op_count++ );
+
+	buf = alloc_safe_buffer(device_info, ptr, size, dir);
+	if (buf == NULL) {
+		dev_err(dev, "%s: unable to map unsafe buffer %p!\n",
+		       __func__, ptr);
+		return DMA_ERROR_CODE;
+	}
+
+	dev_dbg(dev, "%s: unsafe buffer %p (dma=%#x) mapped to %p (dma=%#x)\n",
+		__func__, buf->ptr, virt_to_dma(dev, buf->ptr),
+		buf->safe, buf->safe_dma_addr);
+
+	if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL) {
+		dev_dbg(dev, "%s: copy unsafe %p to safe %p, size %d\n",
+			__func__, ptr, buf->safe, size);
+		memcpy(buf->safe, ptr, size);
+	}
+
+	return buf->safe_dma_addr;
+}
+
+static inline void unmap_single(struct device *dev, struct safe_buffer *buf,
+		size_t size, enum dma_data_direction dir)
+{
+	BUG_ON(buf->size != size);
+	BUG_ON(buf->direction != dir);
+
+	dev_dbg(dev, "%s: unsafe buffer %p (dma=%#x) mapped to %p (dma=%#x)\n",
+		__func__, buf->ptr, virt_to_dma(dev, buf->ptr),
+		buf->safe, buf->safe_dma_addr);
+
+	DO_STATS(dev->archdata.dmabounce->bounce_count++);
+
+	if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL) {
+		void *ptr = buf->ptr;
+
+		dev_dbg(dev, "%s: copy back safe %p to unsafe %p size %d\n",
+			__func__, buf->safe, ptr, size);
+		memcpy(ptr, buf->safe, size);
+
+		/*
+		 * Since we may have written to a page cache page,
+		 * we need to ensure that the data will be coherent
+		 * with user mappings.
+		 */
+		__cpuc_flush_dcache_area(ptr, size);
+	}
+	free_safe_buffer(dev->archdata.dmabounce, buf);
+}
+
+/* ************************************************** */
+
+/*
+ * see if a buffer address is in an 'unsafe' range.  if it is
+ * allocate a 'safe' buffer and copy the unsafe buffer into it.
+ * substitute the safe buffer for the unsafe one.
+ * (basically move the buffer from an unsafe area to a safe one)
+ */
+static dma_addr_t dmabounce_map_page(struct device *dev, struct page *page,
+		unsigned long offset, size_t size, enum dma_data_direction dir,
+		struct dma_attrs *attrs)
+{
+	dma_addr_t dma_addr;
+	int ret;
+
+	dev_dbg(dev, "%s(page=%p,off=%#lx,size=%zx,dir=%x)\n",
+		__func__, page, offset, size, dir);
+
+	dma_addr = pfn_to_dma(dev, page_to_pfn(page)) + offset;
+
+	ret = needs_bounce(dev, dma_addr, size);
+	if (ret < 0)
+		return DMA_ERROR_CODE;
+
+	if (ret == 0) {
+		arm_dma_ops.sync_single_for_device(dev, dma_addr, size, dir);
+		return dma_addr;
+	}
+
+	if (PageHighMem(page)) {
+		dev_err(dev, "DMA buffer bouncing of HIGHMEM pages is not supported\n");
+		return DMA_ERROR_CODE;
+	}
+
+	return map_single(dev, page_address(page) + offset, size, dir);
+}
+
+/*
+ * see if a mapped address was really a "safe" buffer and if so, copy
+ * the data from the safe buffer back to the unsafe buffer and free up
+ * the safe buffer.  (basically return things back to the way they
+ * should be)
+ */
+static void dmabounce_unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
+		enum dma_data_direction dir, struct dma_attrs *attrs)
+{
+	struct safe_buffer *buf;
+
+	dev_dbg(dev, "%s(dma=%#x,size=%d,dir=%x)\n",
+		__func__, dma_addr, size, dir);
+
+	buf = find_safe_buffer_dev(dev, dma_addr, __func__);
+	if (!buf) {
+		arm_dma_ops.sync_single_for_cpu(dev, dma_addr, size, dir);
+		return;
+	}
+
+	unmap_single(dev, buf, size, dir);
+}
+
+static int __dmabounce_sync_for_cpu(struct device *dev, dma_addr_t addr,
+		size_t sz, enum dma_data_direction dir)
+{
+	struct safe_buffer *buf;
+	unsigned long off;
+
+	dev_dbg(dev, "%s(dma=%#x,sz=%zx,dir=%x)\n",
+		__func__, addr, sz, dir);
+
+	buf = find_safe_buffer_dev(dev, addr, __func__);
+	if (!buf)
+		return 1;
+
+	off = addr - buf->safe_dma_addr;
+
+	BUG_ON(buf->direction != dir);
+
+	dev_dbg(dev, "%s: unsafe buffer %p (dma=%#x off=%#lx) mapped to %p (dma=%#x)\n",
+		__func__, buf->ptr, virt_to_dma(dev, buf->ptr), off,
+		buf->safe, buf->safe_dma_addr);
+
+	DO_STATS(dev->archdata.dmabounce->bounce_count++);
+
+	if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL) {
+		dev_dbg(dev, "%s: copy back safe %p to unsafe %p size %d\n",
+			__func__, buf->safe + off, buf->ptr + off, sz);
+		memcpy(buf->ptr + off, buf->safe + off, sz);
+	}
+	return 0;
+}
+
+static void dmabounce_sync_for_cpu(struct device *dev,
+		dma_addr_t handle, size_t size, enum dma_data_direction dir)
+{
+	if (!__dmabounce_sync_for_cpu(dev, handle, size, dir))
+		return;
+
+	arm_dma_ops.sync_single_for_cpu(dev, handle, size, dir);
+}
+
+static int __dmabounce_sync_for_device(struct device *dev, dma_addr_t addr,
+		size_t sz, enum dma_data_direction dir)
+{
+	struct safe_buffer *buf;
+	unsigned long off;
+
+	dev_dbg(dev, "%s(dma=%#x,sz=%zx,dir=%x)\n",
+		__func__, addr, sz, dir);
+
+	buf = find_safe_buffer_dev(dev, addr, __func__);
+	if (!buf)
+		return 1;
+
+	off = addr - buf->safe_dma_addr;
+
+	BUG_ON(buf->direction != dir);
+
+	dev_dbg(dev, "%s: unsafe buffer %p (dma=%#x off=%#lx) mapped to %p (dma=%#x)\n",
+		__func__, buf->ptr, virt_to_dma(dev, buf->ptr), off,
+		buf->safe, buf->safe_dma_addr);
+
+	DO_STATS(dev->archdata.dmabounce->bounce_count++);
+
+	if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL) {
+		dev_dbg(dev, "%s: copy out unsafe %p to safe %p, size %d\n",
+			__func__,buf->ptr + off, buf->safe + off, sz);
+		memcpy(buf->safe + off, buf->ptr + off, sz);
+	}
+	return 0;
+}
+
+static void dmabounce_sync_for_device(struct device *dev,
+		dma_addr_t handle, size_t size, enum dma_data_direction dir)
+{
+	if (!__dmabounce_sync_for_device(dev, handle, size, dir))
+		return;
+
+	arm_dma_ops.sync_single_for_device(dev, handle, size, dir);
+}
+
+static int dmabounce_set_mask(struct device *dev, u64 dma_mask)
+{
+	if (dev->archdata.dmabounce)
+		return 0;
+
+	return arm_dma_ops.set_dma_mask(dev, dma_mask);
+}
+
+static struct dma_map_ops dmabounce_ops = {
+	.alloc			= arm_dma_alloc,
+	.free			= arm_dma_free,
+	.mmap			= arm_dma_mmap,
+	.get_sgtable		= arm_dma_get_sgtable,
+	.map_page		= dmabounce_map_page,
+	.unmap_page		= dmabounce_unmap_page,
+	.sync_single_for_cpu	= dmabounce_sync_for_cpu,
+	.sync_single_for_device	= dmabounce_sync_for_device,
+	.map_sg			= arm_dma_map_sg,
+	.unmap_sg		= arm_dma_unmap_sg,
+	.sync_sg_for_cpu	= arm_dma_sync_sg_for_cpu,
+	.sync_sg_for_device	= arm_dma_sync_sg_for_device,
+	.set_dma_mask		= dmabounce_set_mask,
+};
+
+static int dmabounce_init_pool(struct dmabounce_pool *pool, struct device *dev,
+		const char *name, unsigned long size)
+{
+	pool->size = size;
+	DO_STATS(pool->allocs = 0);
+	pool->pool = dma_pool_create(name, dev, size,
+				     0 /* byte alignment */,
+				     0 /* no page-crossing issues */);
+
+	return pool->pool ? 0 : -ENOMEM;
+}
+
+int dmabounce_register_dev(struct device *dev, unsigned long small_buffer_size,
+		unsigned long large_buffer_size,
+		int (*needs_bounce_fn)(struct device *, dma_addr_t, size_t))
+{
+	struct dmabounce_device_info *device_info;
+	int ret;
+
+	device_info = kmalloc(sizeof(struct dmabounce_device_info), GFP_ATOMIC);
+	if (!device_info) {
+		dev_err(dev,
+			"Could not allocated dmabounce_device_info\n");
+		return -ENOMEM;
+	}
+
+	ret = dmabounce_init_pool(&device_info->small, dev,
+				  "small_dmabounce_pool", small_buffer_size);
+	if (ret) {
+		dev_err(dev,
+			"dmabounce: could not allocate DMA pool for %ld byte objects\n",
+			small_buffer_size);
+		goto err_free;
+	}
+
+	if (large_buffer_size) {
+		ret = dmabounce_init_pool(&device_info->large, dev,
+					  "large_dmabounce_pool",
+					  large_buffer_size);
+		if (ret) {
+			dev_err(dev,
+				"dmabounce: could not allocate DMA pool for %ld byte objects\n",
+				large_buffer_size);
+			goto err_destroy;
+		}
+	}
+
+	device_info->dev = dev;
+	INIT_LIST_HEAD(&device_info->safe_buffers);
+	rwlock_init(&device_info->lock);
+	device_info->needs_bounce = needs_bounce_fn;
+
+#ifdef STATS
+	device_info->total_allocs = 0;
+	device_info->map_op_count = 0;
+	device_info->bounce_count = 0;
+	device_info->attr_res = device_create_file(dev, &dev_attr_dmabounce_stats);
+#endif
+
+	dev->archdata.dmabounce = device_info;
+	set_dma_ops(dev, &dmabounce_ops);
+
+	dev_info(dev, "dmabounce: registered device\n");
+
+	return 0;
+
+ err_destroy:
+	dma_pool_destroy(device_info->small.pool);
+ err_free:
+	kfree(device_info);
+	return ret;
+}
+EXPORT_SYMBOL(dmabounce_register_dev);
+
+void dmabounce_unregister_dev(struct device *dev)
+{
+	struct dmabounce_device_info *device_info = dev->archdata.dmabounce;
+
+	dev->archdata.dmabounce = NULL;
+	set_dma_ops(dev, NULL);
+
+	if (!device_info) {
+		dev_warn(dev,
+			 "Never registered with dmabounce but attempting"
+			 "to unregister!\n");
+		return;
+	}
+
+	if (!list_empty(&device_info->safe_buffers)) {
+		dev_err(dev,
+			"Removing from dmabounce with pending buffers!\n");
+		BUG();
+	}
+
+	if (device_info->small.pool)
+		dma_pool_destroy(device_info->small.pool);
+	if (device_info->large.pool)
+		dma_pool_destroy(device_info->large.pool);
+
+#ifdef STATS
+	if (device_info->attr_res == 0)
+		device_remove_file(dev, &dev_attr_dmabounce_stats);
+#endif
+
+	kfree(device_info);
+
+	dev_info(dev, "dmabounce: device unregistered\n");
+}
+EXPORT_SYMBOL(dmabounce_unregister_dev);
+
+MODULE_AUTHOR("Christopher Hoover <ch@hpl.hp.com>, Deepak Saxena <dsaxena@plexity.net>");
+MODULE_DESCRIPTION("Special dma_{map/unmap/dma_sync}_* routines for systems with limited DMA windows");
+MODULE_LICENSE("GPL");
diff --git a/kernel/arch/arm/common/edma.c b/kernel/arch/arm/common/edma.c
new file mode 100644
index 000000000..5662a8726
--- /dev/null
+++ b/kernel/arch/arm/common/edma.c
@@ -0,0 +1,1873 @@
+/*
+ * EDMA3 support for DaVinci
+ *
+ * Copyright (C) 2006-2009 Texas Instruments.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/edma.h>
+#include <linux/dma-mapping.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/of_dma.h>
+#include <linux/of_irq.h>
+#include <linux/pm_runtime.h>
+
+#include <linux/platform_data/edma.h>
+
+/* Offsets matching "struct edmacc_param" */
+#define PARM_OPT		0x00
+#define PARM_SRC		0x04
+#define PARM_A_B_CNT		0x08
+#define PARM_DST		0x0c
+#define PARM_SRC_DST_BIDX	0x10
+#define PARM_LINK_BCNTRLD	0x14
+#define PARM_SRC_DST_CIDX	0x18
+#define PARM_CCNT		0x1c
+
+#define PARM_SIZE		0x20
+
+/* Offsets for EDMA CC global channel registers and their shadows */
+#define SH_ER		0x00	/* 64 bits */
+#define SH_ECR		0x08	/* 64 bits */
+#define SH_ESR		0x10	/* 64 bits */
+#define SH_CER		0x18	/* 64 bits */
+#define SH_EER		0x20	/* 64 bits */
+#define SH_EECR		0x28	/* 64 bits */
+#define SH_EESR		0x30	/* 64 bits */
+#define SH_SER		0x38	/* 64 bits */
+#define SH_SECR		0x40	/* 64 bits */
+#define SH_IER		0x50	/* 64 bits */
+#define SH_IECR		0x58	/* 64 bits */
+#define SH_IESR		0x60	/* 64 bits */
+#define SH_IPR		0x68	/* 64 bits */
+#define SH_ICR		0x70	/* 64 bits */
+#define SH_IEVAL	0x78
+#define SH_QER		0x80
+#define SH_QEER		0x84
+#define SH_QEECR	0x88
+#define SH_QEESR	0x8c
+#define SH_QSER		0x90
+#define SH_QSECR	0x94
+#define SH_SIZE		0x200
+
+/* Offsets for EDMA CC global registers */
+#define EDMA_REV	0x0000
+#define EDMA_CCCFG	0x0004
+#define EDMA_QCHMAP	0x0200	/* 8 registers */
+#define EDMA_DMAQNUM	0x0240	/* 8 registers (4 on OMAP-L1xx) */
+#define EDMA_QDMAQNUM	0x0260
+#define EDMA_QUETCMAP	0x0280
+#define EDMA_QUEPRI	0x0284
+#define EDMA_EMR	0x0300	/* 64 bits */
+#define EDMA_EMCR	0x0308	/* 64 bits */
+#define EDMA_QEMR	0x0310
+#define EDMA_QEMCR	0x0314
+#define EDMA_CCERR	0x0318
+#define EDMA_CCERRCLR	0x031c
+#define EDMA_EEVAL	0x0320
+#define EDMA_DRAE	0x0340	/* 4 x 64 bits*/
+#define EDMA_QRAE	0x0380	/* 4 registers */
+#define EDMA_QUEEVTENTRY	0x0400	/* 2 x 16 registers */
+#define EDMA_QSTAT	0x0600	/* 2 registers */
+#define EDMA_QWMTHRA	0x0620
+#define EDMA_QWMTHRB	0x0624
+#define EDMA_CCSTAT	0x0640
+
+#define EDMA_M		0x1000	/* global channel registers */
+#define EDMA_ECR	0x1008
+#define EDMA_ECRH	0x100C
+#define EDMA_SHADOW0	0x2000	/* 4 regions shadowing global channels */
+#define EDMA_PARM	0x4000	/* 128 param entries */
+
+#define PARM_OFFSET(param_no)	(EDMA_PARM + ((param_no) << 5))
+
+#define EDMA_DCHMAP	0x0100  /* 64 registers */
+
+/* CCCFG register */
+#define GET_NUM_DMACH(x)	(x & 0x7) /* bits 0-2 */
+#define GET_NUM_PAENTRY(x)	((x & 0x7000) >> 12) /* bits 12-14 */
+#define GET_NUM_EVQUE(x)	((x & 0x70000) >> 16) /* bits 16-18 */
+#define GET_NUM_REGN(x)		((x & 0x300000) >> 20) /* bits 20-21 */
+#define CHMAP_EXIST		BIT(24)
+
+#define EDMA_MAX_DMACH           64
+#define EDMA_MAX_PARAMENTRY     512
+
+/*****************************************************************************/
+
+static void __iomem *edmacc_regs_base[EDMA_MAX_CC];
+
+static inline unsigned int edma_read(unsigned ctlr, int offset)
+{
+	return (unsigned int)__raw_readl(edmacc_regs_base[ctlr] + offset);
+}
+
+static inline void edma_write(unsigned ctlr, int offset, int val)
+{
+	__raw_writel(val, edmacc_regs_base[ctlr] + offset);
+}
+static inline void edma_modify(unsigned ctlr, int offset, unsigned and,
+		unsigned or)
+{
+	unsigned val = edma_read(ctlr, offset);
+	val &= and;
+	val |= or;
+	edma_write(ctlr, offset, val);
+}
+static inline void edma_and(unsigned ctlr, int offset, unsigned and)
+{
+	unsigned val = edma_read(ctlr, offset);
+	val &= and;
+	edma_write(ctlr, offset, val);
+}
+static inline void edma_or(unsigned ctlr, int offset, unsigned or)
+{
+	unsigned val = edma_read(ctlr, offset);
+	val |= or;
+	edma_write(ctlr, offset, val);
+}
+static inline unsigned int edma_read_array(unsigned ctlr, int offset, int i)
+{
+	return edma_read(ctlr, offset + (i << 2));
+}
+static inline void edma_write_array(unsigned ctlr, int offset, int i,
+		unsigned val)
+{
+	edma_write(ctlr, offset + (i << 2), val);
+}
+static inline void edma_modify_array(unsigned ctlr, int offset, int i,
+		unsigned and, unsigned or)
+{
+	edma_modify(ctlr, offset + (i << 2), and, or);
+}
+static inline void edma_or_array(unsigned ctlr, int offset, int i, unsigned or)
+{
+	edma_or(ctlr, offset + (i << 2), or);
+}
+static inline void edma_or_array2(unsigned ctlr, int offset, int i, int j,
+		unsigned or)
+{
+	edma_or(ctlr, offset + ((i*2 + j) << 2), or);
+}
+static inline void edma_write_array2(unsigned ctlr, int offset, int i, int j,
+		unsigned val)
+{
+	edma_write(ctlr, offset + ((i*2 + j) << 2), val);
+}
+static inline unsigned int edma_shadow0_read(unsigned ctlr, int offset)
+{
+	return edma_read(ctlr, EDMA_SHADOW0 + offset);
+}
+static inline unsigned int edma_shadow0_read_array(unsigned ctlr, int offset,
+		int i)
+{
+	return edma_read(ctlr, EDMA_SHADOW0 + offset + (i << 2));
+}
+static inline void edma_shadow0_write(unsigned ctlr, int offset, unsigned val)
+{
+	edma_write(ctlr, EDMA_SHADOW0 + offset, val);
+}
+static inline void edma_shadow0_write_array(unsigned ctlr, int offset, int i,
+		unsigned val)
+{
+	edma_write(ctlr, EDMA_SHADOW0 + offset + (i << 2), val);
+}
+static inline unsigned int edma_parm_read(unsigned ctlr, int offset,
+		int param_no)
+{
+	return edma_read(ctlr, EDMA_PARM + offset + (param_no << 5));
+}
+static inline void edma_parm_write(unsigned ctlr, int offset, int param_no,
+		unsigned val)
+{
+	edma_write(ctlr, EDMA_PARM + offset + (param_no << 5), val);
+}
+static inline void edma_parm_modify(unsigned ctlr, int offset, int param_no,
+		unsigned and, unsigned or)
+{
+	edma_modify(ctlr, EDMA_PARM + offset + (param_no << 5), and, or);
+}
+static inline void edma_parm_and(unsigned ctlr, int offset, int param_no,
+		unsigned and)
+{
+	edma_and(ctlr, EDMA_PARM + offset + (param_no << 5), and);
+}
+static inline void edma_parm_or(unsigned ctlr, int offset, int param_no,
+		unsigned or)
+{
+	edma_or(ctlr, EDMA_PARM + offset + (param_no << 5), or);
+}
+
+static inline void set_bits(int offset, int len, unsigned long *p)
+{
+	for (; len > 0; len--)
+		set_bit(offset + (len - 1), p);
+}
+
+static inline void clear_bits(int offset, int len, unsigned long *p)
+{
+	for (; len > 0; len--)
+		clear_bit(offset + (len - 1), p);
+}
+
+/*****************************************************************************/
+
+/* actual number of DMA channels and slots on this silicon */
+struct edma {
+	/* how many dma resources of each type */
+	unsigned	num_channels;
+	unsigned	num_region;
+	unsigned	num_slots;
+	unsigned	num_tc;
+	enum dma_event_q 	default_queue;
+
+	/* list of channels with no even trigger; terminated by "-1" */
+	const s8	*noevent;
+
+	struct edma_soc_info *info;
+
+	/* The edma_inuse bit for each PaRAM slot is clear unless the
+	 * channel is in use ... by ARM or DSP, for QDMA, or whatever.
+	 */
+	DECLARE_BITMAP(edma_inuse, EDMA_MAX_PARAMENTRY);
+
+	/* The edma_unused bit for each channel is clear unless
+	 * it is not being used on this platform. It uses a bit
+	 * of SOC-specific initialization code.
+	 */
+	DECLARE_BITMAP(edma_unused, EDMA_MAX_DMACH);
+
+	unsigned	irq_res_start;
+	unsigned	irq_res_end;
+
+	struct dma_interrupt_data {
+		void (*callback)(unsigned channel, unsigned short ch_status,
+				void *data);
+		void *data;
+	} intr_data[EDMA_MAX_DMACH];
+};
+
+static struct edma *edma_cc[EDMA_MAX_CC];
+static int arch_num_cc;
+
+/* dummy param set used to (re)initialize parameter RAM slots */
+static const struct edmacc_param dummy_paramset = {
+	.link_bcntrld = 0xffff,
+	.ccnt = 1,
+};
+
+static const struct of_device_id edma_of_ids[] = {
+	{ .compatible = "ti,edma3", },
+	{}
+};
+
+/*****************************************************************************/
+
+static void map_dmach_queue(unsigned ctlr, unsigned ch_no,
+		enum dma_event_q queue_no)
+{
+	int bit = (ch_no & 0x7) * 4;
+
+	/* default to low priority queue */
+	if (queue_no == EVENTQ_DEFAULT)
+		queue_no = edma_cc[ctlr]->default_queue;
+
+	queue_no &= 7;
+	edma_modify_array(ctlr, EDMA_DMAQNUM, (ch_no >> 3),
+			~(0x7 << bit), queue_no << bit);
+}
+
+static void assign_priority_to_queue(unsigned ctlr, int queue_no,
+		int priority)
+{
+	int bit = queue_no * 4;
+	edma_modify(ctlr, EDMA_QUEPRI, ~(0x7 << bit),
+			((priority & 0x7) << bit));
+}
+
+/**
+ * map_dmach_param - Maps channel number to param entry number
+ *
+ * This maps the dma channel number to param entry numberter. In
+ * other words using the DMA channel mapping registers a param entry
+ * can be mapped to any channel
+ *
+ * Callers are responsible for ensuring the channel mapping logic is
+ * included in that particular EDMA variant (Eg : dm646x)
+ *
+ */
+static void map_dmach_param(unsigned ctlr)
+{
+	int i;
+	for (i = 0; i < EDMA_MAX_DMACH; i++)
+		edma_write_array(ctlr, EDMA_DCHMAP , i , (i << 5));
+}
+
+static inline void
+setup_dma_interrupt(unsigned lch,
+	void (*callback)(unsigned channel, u16 ch_status, void *data),
+	void *data)
+{
+	unsigned ctlr;
+
+	ctlr = EDMA_CTLR(lch);
+	lch = EDMA_CHAN_SLOT(lch);
+
+	if (!callback)
+		edma_shadow0_write_array(ctlr, SH_IECR, lch >> 5,
+				BIT(lch & 0x1f));
+
+	edma_cc[ctlr]->intr_data[lch].callback = callback;
+	edma_cc[ctlr]->intr_data[lch].data = data;
+
+	if (callback) {
+		edma_shadow0_write_array(ctlr, SH_ICR, lch >> 5,
+				BIT(lch & 0x1f));
+		edma_shadow0_write_array(ctlr, SH_IESR, lch >> 5,
+				BIT(lch & 0x1f));
+	}
+}
+
+static int irq2ctlr(int irq)
+{
+	if (irq >= edma_cc[0]->irq_res_start && irq <= edma_cc[0]->irq_res_end)
+		return 0;
+	else if (irq >= edma_cc[1]->irq_res_start &&
+		irq <= edma_cc[1]->irq_res_end)
+		return 1;
+
+	return -1;
+}
+
+/******************************************************************************
+ *
+ * DMA interrupt handler
+ *
+ *****************************************************************************/
+static irqreturn_t dma_irq_handler(int irq, void *data)
+{
+	int ctlr;
+	u32 sh_ier;
+	u32 sh_ipr;
+	u32 bank;
+
+	ctlr = irq2ctlr(irq);
+	if (ctlr < 0)
+		return IRQ_NONE;
+
+	dev_dbg(data, "dma_irq_handler\n");
+
+	sh_ipr = edma_shadow0_read_array(ctlr, SH_IPR, 0);
+	if (!sh_ipr) {
+		sh_ipr = edma_shadow0_read_array(ctlr, SH_IPR, 1);
+		if (!sh_ipr)
+			return IRQ_NONE;
+		sh_ier = edma_shadow0_read_array(ctlr, SH_IER, 1);
+		bank = 1;
+	} else {
+		sh_ier = edma_shadow0_read_array(ctlr, SH_IER, 0);
+		bank = 0;
+	}
+
+	do {
+		u32 slot;
+		u32 channel;
+
+		dev_dbg(data, "IPR%d %08x\n", bank, sh_ipr);
+
+		slot = __ffs(sh_ipr);
+		sh_ipr &= ~(BIT(slot));
+
+		if (sh_ier & BIT(slot)) {
+			channel = (bank << 5) | slot;
+			/* Clear the corresponding IPR bits */
+			edma_shadow0_write_array(ctlr, SH_ICR, bank,
+					BIT(slot));
+			if (edma_cc[ctlr]->intr_data[channel].callback)
+				edma_cc[ctlr]->intr_data[channel].callback(
+					channel, EDMA_DMA_COMPLETE,
+					edma_cc[ctlr]->intr_data[channel].data);
+		}
+	} while (sh_ipr);
+
+	edma_shadow0_write(ctlr, SH_IEVAL, 1);
+	return IRQ_HANDLED;
+}
+
+/******************************************************************************
+ *
+ * DMA error interrupt handler
+ *
+ *****************************************************************************/
+static irqreturn_t dma_ccerr_handler(int irq, void *data)
+{
+	int i;
+	int ctlr;
+	unsigned int cnt = 0;
+
+	ctlr = irq2ctlr(irq);
+	if (ctlr < 0)
+		return IRQ_NONE;
+
+	dev_dbg(data, "dma_ccerr_handler\n");
+
+	if ((edma_read_array(ctlr, EDMA_EMR, 0) == 0) &&
+	    (edma_read_array(ctlr, EDMA_EMR, 1) == 0) &&
+	    (edma_read(ctlr, EDMA_QEMR) == 0) &&
+	    (edma_read(ctlr, EDMA_CCERR) == 0))
+		return IRQ_NONE;
+
+	while (1) {
+		int j = -1;
+		if (edma_read_array(ctlr, EDMA_EMR, 0))
+			j = 0;
+		else if (edma_read_array(ctlr, EDMA_EMR, 1))
+			j = 1;
+		if (j >= 0) {
+			dev_dbg(data, "EMR%d %08x\n", j,
+					edma_read_array(ctlr, EDMA_EMR, j));
+			for (i = 0; i < 32; i++) {
+				int k = (j << 5) + i;
+				if (edma_read_array(ctlr, EDMA_EMR, j) &
+							BIT(i)) {
+					/* Clear the corresponding EMR bits */
+					edma_write_array(ctlr, EDMA_EMCR, j,
+							BIT(i));
+					/* Clear any SER */
+					edma_shadow0_write_array(ctlr, SH_SECR,
+								j, BIT(i));
+					if (edma_cc[ctlr]->intr_data[k].
+								callback) {
+						edma_cc[ctlr]->intr_data[k].
+						callback(k,
+						EDMA_DMA_CC_ERROR,
+						edma_cc[ctlr]->intr_data
+						[k].data);
+					}
+				}
+			}
+		} else if (edma_read(ctlr, EDMA_QEMR)) {
+			dev_dbg(data, "QEMR %02x\n",
+				edma_read(ctlr, EDMA_QEMR));
+			for (i = 0; i < 8; i++) {
+				if (edma_read(ctlr, EDMA_QEMR) & BIT(i)) {
+					/* Clear the corresponding IPR bits */
+					edma_write(ctlr, EDMA_QEMCR, BIT(i));
+					edma_shadow0_write(ctlr, SH_QSECR,
+								BIT(i));
+
+					/* NOTE:  not reported!! */
+				}
+			}
+		} else if (edma_read(ctlr, EDMA_CCERR)) {
+			dev_dbg(data, "CCERR %08x\n",
+				edma_read(ctlr, EDMA_CCERR));
+			/* FIXME:  CCERR.BIT(16) ignored!  much better
+			 * to just write CCERRCLR with CCERR value...
+			 */
+			for (i = 0; i < 8; i++) {
+				if (edma_read(ctlr, EDMA_CCERR) & BIT(i)) {
+					/* Clear the corresponding IPR bits */
+					edma_write(ctlr, EDMA_CCERRCLR, BIT(i));
+
+					/* NOTE:  not reported!! */
+				}
+			}
+		}
+		if ((edma_read_array(ctlr, EDMA_EMR, 0) == 0) &&
+		    (edma_read_array(ctlr, EDMA_EMR, 1) == 0) &&
+		    (edma_read(ctlr, EDMA_QEMR) == 0) &&
+		    (edma_read(ctlr, EDMA_CCERR) == 0))
+			break;
+		cnt++;
+		if (cnt > 10)
+			break;
+	}
+	edma_write(ctlr, EDMA_EEVAL, 1);
+	return IRQ_HANDLED;
+}
+
+static int reserve_contiguous_slots(int ctlr, unsigned int id,
+				     unsigned int num_slots,
+				     unsigned int start_slot)
+{
+	int i, j;
+	unsigned int count = num_slots;
+	int stop_slot = start_slot;
+	DECLARE_BITMAP(tmp_inuse, EDMA_MAX_PARAMENTRY);
+
+	for (i = start_slot; i < edma_cc[ctlr]->num_slots; ++i) {
+		j = EDMA_CHAN_SLOT(i);
+		if (!test_and_set_bit(j, edma_cc[ctlr]->edma_inuse)) {
+			/* Record our current beginning slot */
+			if (count == num_slots)
+				stop_slot = i;
+
+			count--;
+			set_bit(j, tmp_inuse);
+
+			if (count == 0)
+				break;
+		} else {
+			clear_bit(j, tmp_inuse);
+
+			if (id == EDMA_CONT_PARAMS_FIXED_EXACT) {
+				stop_slot = i;
+				break;
+			} else {
+				count = num_slots;
+			}
+		}
+	}
+
+	/*
+	 * We have to clear any bits that we set
+	 * if we run out parameter RAM slots, i.e we do find a set
+	 * of contiguous parameter RAM slots but do not find the exact number
+	 * requested as we may reach the total number of parameter RAM slots
+	 */
+	if (i == edma_cc[ctlr]->num_slots)
+		stop_slot = i;
+
+	j = start_slot;
+	for_each_set_bit_from(j, tmp_inuse, stop_slot)
+		clear_bit(j, edma_cc[ctlr]->edma_inuse);
+
+	if (count)
+		return -EBUSY;
+
+	for (j = i - num_slots + 1; j <= i; ++j)
+		memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(j),
+			&dummy_paramset, PARM_SIZE);
+
+	return EDMA_CTLR_CHAN(ctlr, i - num_slots + 1);
+}
+
+static int prepare_unused_channel_list(struct device *dev, void *data)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	int i, count, ctlr;
+	struct of_phandle_args  dma_spec;
+
+	if (dev->of_node) {
+		count = of_property_count_strings(dev->of_node, "dma-names");
+		if (count < 0)
+			return 0;
+		for (i = 0; i < count; i++) {
+			if (of_parse_phandle_with_args(dev->of_node, "dmas",
+						       "#dma-cells", i,
+						       &dma_spec))
+				continue;
+
+			if (!of_match_node(edma_of_ids, dma_spec.np)) {
+				of_node_put(dma_spec.np);
+				continue;
+			}
+
+			clear_bit(EDMA_CHAN_SLOT(dma_spec.args[0]),
+				  edma_cc[0]->edma_unused);
+			of_node_put(dma_spec.np);
+		}
+		return 0;
+	}
+
+	/* For non-OF case */
+	for (i = 0; i < pdev->num_resources; i++) {
+		if ((pdev->resource[i].flags & IORESOURCE_DMA) &&
+				(int)pdev->resource[i].start >= 0) {
+			ctlr = EDMA_CTLR(pdev->resource[i].start);
+			clear_bit(EDMA_CHAN_SLOT(pdev->resource[i].start),
+				  edma_cc[ctlr]->edma_unused);
+		}
+	}
+
+	return 0;
+}
+
+/*-----------------------------------------------------------------------*/
+
+static bool unused_chan_list_done;
+
+/* Resource alloc/free:  dma channels, parameter RAM slots */
+
+/**
+ * edma_alloc_channel - allocate DMA channel and paired parameter RAM
+ * @channel: specific channel to allocate; negative for "any unmapped channel"
+ * @callback: optional; to be issued on DMA completion or errors
+ * @data: passed to callback
+ * @eventq_no: an EVENTQ_* constant, used to choose which Transfer
+ *	Controller (TC) executes requests using this channel.  Use
+ *	EVENTQ_DEFAULT unless you really need a high priority queue.
+ *
+ * This allocates a DMA channel and its associated parameter RAM slot.
+ * The parameter RAM is initialized to hold a dummy transfer.
+ *
+ * Normal use is to pass a specific channel number as @channel, to make
+ * use of hardware events mapped to that channel.  When the channel will
+ * be used only for software triggering or event chaining, channels not
+ * mapped to hardware events (or mapped to unused events) are preferable.
+ *
+ * DMA transfers start from a channel using edma_start(), or by
+ * chaining.  When the transfer described in that channel's parameter RAM
+ * slot completes, that slot's data may be reloaded through a link.
+ *
+ * DMA errors are only reported to the @callback associated with the
+ * channel driving that transfer, but transfer completion callbacks can
+ * be sent to another channel under control of the TCC field in
+ * the option word of the transfer's parameter RAM set.  Drivers must not
+ * use DMA transfer completion callbacks for channels they did not allocate.
+ * (The same applies to TCC codes used in transfer chaining.)
+ *
+ * Returns the number of the channel, else negative errno.
+ */
+int edma_alloc_channel(int channel,
+		void (*callback)(unsigned channel, u16 ch_status, void *data),
+		void *data,
+		enum dma_event_q eventq_no)
+{
+	unsigned i, done = 0, ctlr = 0;
+	int ret = 0;
+
+	if (!unused_chan_list_done) {
+		/*
+		 * Scan all the platform devices to find out the EDMA channels
+		 * used and clear them in the unused list, making the rest
+		 * available for ARM usage.
+		 */
+		ret = bus_for_each_dev(&platform_bus_type, NULL, NULL,
+				prepare_unused_channel_list);
+		if (ret < 0)
+			return ret;
+
+		unused_chan_list_done = true;
+	}
+
+	if (channel >= 0) {
+		ctlr = EDMA_CTLR(channel);
+		channel = EDMA_CHAN_SLOT(channel);
+	}
+
+	if (channel < 0) {
+		for (i = 0; i < arch_num_cc; i++) {
+			channel = 0;
+			for (;;) {
+				channel = find_next_bit(edma_cc[i]->edma_unused,
+						edma_cc[i]->num_channels,
+						channel);
+				if (channel == edma_cc[i]->num_channels)
+					break;
+				if (!test_and_set_bit(channel,
+						edma_cc[i]->edma_inuse)) {
+					done = 1;
+					ctlr = i;
+					break;
+				}
+				channel++;
+			}
+			if (done)
+				break;
+		}
+		if (!done)
+			return -ENOMEM;
+	} else if (channel >= edma_cc[ctlr]->num_channels) {
+		return -EINVAL;
+	} else if (test_and_set_bit(channel, edma_cc[ctlr]->edma_inuse)) {
+		return -EBUSY;
+	}
+
+	/* ensure access through shadow region 0 */
+	edma_or_array2(ctlr, EDMA_DRAE, 0, channel >> 5, BIT(channel & 0x1f));
+
+	/* ensure no events are pending */
+	edma_stop(EDMA_CTLR_CHAN(ctlr, channel));
+	memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(channel),
+			&dummy_paramset, PARM_SIZE);
+
+	if (callback)
+		setup_dma_interrupt(EDMA_CTLR_CHAN(ctlr, channel),
+					callback, data);
+
+	map_dmach_queue(ctlr, channel, eventq_no);
+
+	return EDMA_CTLR_CHAN(ctlr, channel);
+}
+EXPORT_SYMBOL(edma_alloc_channel);
+
+
+/**
+ * edma_free_channel - deallocate DMA channel
+ * @channel: dma channel returned from edma_alloc_channel()
+ *
+ * This deallocates the DMA channel and associated parameter RAM slot
+ * allocated by edma_alloc_channel().
+ *
+ * Callers are responsible for ensuring the channel is inactive, and
+ * will not be reactivated by linking, chaining, or software calls to
+ * edma_start().
+ */
+void edma_free_channel(unsigned channel)
+{
+	unsigned ctlr;
+
+	ctlr = EDMA_CTLR(channel);
+	channel = EDMA_CHAN_SLOT(channel);
+
+	if (channel >= edma_cc[ctlr]->num_channels)
+		return;
+
+	setup_dma_interrupt(channel, NULL, NULL);
+	/* REVISIT should probably take out of shadow region 0 */
+
+	memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(channel),
+			&dummy_paramset, PARM_SIZE);
+	clear_bit(channel, edma_cc[ctlr]->edma_inuse);
+}
+EXPORT_SYMBOL(edma_free_channel);
+
+/**
+ * edma_alloc_slot - allocate DMA parameter RAM
+ * @slot: specific slot to allocate; negative for "any unused slot"
+ *
+ * This allocates a parameter RAM slot, initializing it to hold a
+ * dummy transfer.  Slots allocated using this routine have not been
+ * mapped to a hardware DMA channel, and will normally be used by
+ * linking to them from a slot associated with a DMA channel.
+ *
+ * Normal use is to pass EDMA_SLOT_ANY as the @slot, but specific
+ * slots may be allocated on behalf of DSP firmware.
+ *
+ * Returns the number of the slot, else negative errno.
+ */
+int edma_alloc_slot(unsigned ctlr, int slot)
+{
+	if (!edma_cc[ctlr])
+		return -EINVAL;
+
+	if (slot >= 0)
+		slot = EDMA_CHAN_SLOT(slot);
+
+	if (slot < 0) {
+		slot = edma_cc[ctlr]->num_channels;
+		for (;;) {
+			slot = find_next_zero_bit(edma_cc[ctlr]->edma_inuse,
+					edma_cc[ctlr]->num_slots, slot);
+			if (slot == edma_cc[ctlr]->num_slots)
+				return -ENOMEM;
+			if (!test_and_set_bit(slot, edma_cc[ctlr]->edma_inuse))
+				break;
+		}
+	} else if (slot < edma_cc[ctlr]->num_channels ||
+			slot >= edma_cc[ctlr]->num_slots) {
+		return -EINVAL;
+	} else if (test_and_set_bit(slot, edma_cc[ctlr]->edma_inuse)) {
+		return -EBUSY;
+	}
+
+	memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(slot),
+			&dummy_paramset, PARM_SIZE);
+
+	return EDMA_CTLR_CHAN(ctlr, slot);
+}
+EXPORT_SYMBOL(edma_alloc_slot);
+
+/**
+ * edma_free_slot - deallocate DMA parameter RAM
+ * @slot: parameter RAM slot returned from edma_alloc_slot()
+ *
+ * This deallocates the parameter RAM slot allocated by edma_alloc_slot().
+ * Callers are responsible for ensuring the slot is inactive, and will
+ * not be activated.
+ */
+void edma_free_slot(unsigned slot)
+{
+	unsigned ctlr;
+
+	ctlr = EDMA_CTLR(slot);
+	slot = EDMA_CHAN_SLOT(slot);
+
+	if (slot < edma_cc[ctlr]->num_channels ||
+		slot >= edma_cc[ctlr]->num_slots)
+		return;
+
+	memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(slot),
+			&dummy_paramset, PARM_SIZE);
+	clear_bit(slot, edma_cc[ctlr]->edma_inuse);
+}
+EXPORT_SYMBOL(edma_free_slot);
+
+
+/**
+ * edma_alloc_cont_slots- alloc contiguous parameter RAM slots
+ * The API will return the starting point of a set of
+ * contiguous parameter RAM slots that have been requested
+ *
+ * @id: can only be EDMA_CONT_PARAMS_ANY or EDMA_CONT_PARAMS_FIXED_EXACT
+ * or EDMA_CONT_PARAMS_FIXED_NOT_EXACT
+ * @count: number of contiguous Paramter RAM slots
+ * @slot  - the start value of Parameter RAM slot that should be passed if id
+ * is EDMA_CONT_PARAMS_FIXED_EXACT or EDMA_CONT_PARAMS_FIXED_NOT_EXACT
+ *
+ * If id is EDMA_CONT_PARAMS_ANY then the API starts looking for a set of
+ * contiguous Parameter RAM slots from parameter RAM 64 in the case of
+ * DaVinci SOCs and 32 in the case of DA8xx SOCs.
+ *
+ * If id is EDMA_CONT_PARAMS_FIXED_EXACT then the API starts looking for a
+ * set of contiguous parameter RAM slots from the "slot" that is passed as an
+ * argument to the API.
+ *
+ * If id is EDMA_CONT_PARAMS_FIXED_NOT_EXACT then the API initially tries
+ * starts looking for a set of contiguous parameter RAMs from the "slot"
+ * that is passed as an argument to the API. On failure the API will try to
+ * find a set of contiguous Parameter RAM slots from the remaining Parameter
+ * RAM slots
+ */
+int edma_alloc_cont_slots(unsigned ctlr, unsigned int id, int slot, int count)
+{
+	/*
+	 * The start slot requested should be greater than
+	 * the number of channels and lesser than the total number
+	 * of slots
+	 */
+	if ((id != EDMA_CONT_PARAMS_ANY) &&
+		(slot < edma_cc[ctlr]->num_channels ||
+		slot >= edma_cc[ctlr]->num_slots))
+		return -EINVAL;
+
+	/*
+	 * The number of parameter RAM slots requested cannot be less than 1
+	 * and cannot be more than the number of slots minus the number of
+	 * channels
+	 */
+	if (count < 1 || count >
+		(edma_cc[ctlr]->num_slots - edma_cc[ctlr]->num_channels))
+		return -EINVAL;
+
+	switch (id) {
+	case EDMA_CONT_PARAMS_ANY:
+		return reserve_contiguous_slots(ctlr, id, count,
+						 edma_cc[ctlr]->num_channels);
+	case EDMA_CONT_PARAMS_FIXED_EXACT:
+	case EDMA_CONT_PARAMS_FIXED_NOT_EXACT:
+		return reserve_contiguous_slots(ctlr, id, count, slot);
+	default:
+		return -EINVAL;
+	}
+
+}
+EXPORT_SYMBOL(edma_alloc_cont_slots);
+
+/**
+ * edma_free_cont_slots - deallocate DMA parameter RAM slots
+ * @slot: first parameter RAM of a set of parameter RAM slots to be freed
+ * @count: the number of contiguous parameter RAM slots to be freed
+ *
+ * This deallocates the parameter RAM slots allocated by
+ * edma_alloc_cont_slots.
+ * Callers/applications need to keep track of sets of contiguous
+ * parameter RAM slots that have been allocated using the edma_alloc_cont_slots
+ * API.
+ * Callers are responsible for ensuring the slots are inactive, and will
+ * not be activated.
+ */
+int edma_free_cont_slots(unsigned slot, int count)
+{
+	unsigned ctlr, slot_to_free;
+	int i;
+
+	ctlr = EDMA_CTLR(slot);
+	slot = EDMA_CHAN_SLOT(slot);
+
+	if (slot < edma_cc[ctlr]->num_channels ||
+		slot >= edma_cc[ctlr]->num_slots ||
+		count < 1)
+		return -EINVAL;
+
+	for (i = slot; i < slot + count; ++i) {
+		ctlr = EDMA_CTLR(i);
+		slot_to_free = EDMA_CHAN_SLOT(i);
+
+		memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(slot_to_free),
+			&dummy_paramset, PARM_SIZE);
+		clear_bit(slot_to_free, edma_cc[ctlr]->edma_inuse);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(edma_free_cont_slots);
+
+/*-----------------------------------------------------------------------*/
+
+/* Parameter RAM operations (i) -- read/write partial slots */
+
+/**
+ * edma_set_src - set initial DMA source address in parameter RAM slot
+ * @slot: parameter RAM slot being configured
+ * @src_port: physical address of source (memory, controller FIFO, etc)
+ * @addressMode: INCR, except in very rare cases
+ * @fifoWidth: ignored unless @addressMode is FIFO, else specifies the
+ *	width to use when addressing the fifo (e.g. W8BIT, W32BIT)
+ *
+ * Note that the source address is modified during the DMA transfer
+ * according to edma_set_src_index().
+ */
+void edma_set_src(unsigned slot, dma_addr_t src_port,
+				enum address_mode mode, enum fifo_width width)
+{
+	unsigned ctlr;
+
+	ctlr = EDMA_CTLR(slot);
+	slot = EDMA_CHAN_SLOT(slot);
+
+	if (slot < edma_cc[ctlr]->num_slots) {
+		unsigned int i = edma_parm_read(ctlr, PARM_OPT, slot);
+
+		if (mode) {
+			/* set SAM and program FWID */
+			i = (i & ~(EDMA_FWID)) | (SAM | ((width & 0x7) << 8));
+		} else {
+			/* clear SAM */
+			i &= ~SAM;
+		}
+		edma_parm_write(ctlr, PARM_OPT, slot, i);
+
+		/* set the source port address
+		   in source register of param structure */
+		edma_parm_write(ctlr, PARM_SRC, slot, src_port);
+	}
+}
+EXPORT_SYMBOL(edma_set_src);
+
+/**
+ * edma_set_dest - set initial DMA destination address in parameter RAM slot
+ * @slot: parameter RAM slot being configured
+ * @dest_port: physical address of destination (memory, controller FIFO, etc)
+ * @addressMode: INCR, except in very rare cases
+ * @fifoWidth: ignored unless @addressMode is FIFO, else specifies the
+ *	width to use when addressing the fifo (e.g. W8BIT, W32BIT)
+ *
+ * Note that the destination address is modified during the DMA transfer
+ * according to edma_set_dest_index().
+ */
+void edma_set_dest(unsigned slot, dma_addr_t dest_port,
+				 enum address_mode mode, enum fifo_width width)
+{
+	unsigned ctlr;
+
+	ctlr = EDMA_CTLR(slot);
+	slot = EDMA_CHAN_SLOT(slot);
+
+	if (slot < edma_cc[ctlr]->num_slots) {
+		unsigned int i = edma_parm_read(ctlr, PARM_OPT, slot);
+
+		if (mode) {
+			/* set DAM and program FWID */
+			i = (i & ~(EDMA_FWID)) | (DAM | ((width & 0x7) << 8));
+		} else {
+			/* clear DAM */
+			i &= ~DAM;
+		}
+		edma_parm_write(ctlr, PARM_OPT, slot, i);
+		/* set the destination port address
+		   in dest register of param structure */
+		edma_parm_write(ctlr, PARM_DST, slot, dest_port);
+	}
+}
+EXPORT_SYMBOL(edma_set_dest);
+
+/**
+ * edma_get_position - returns the current transfer point
+ * @slot: parameter RAM slot being examined
+ * @dst:  true selects the dest position, false the source
+ *
+ * Returns the position of the current active slot
+ */
+dma_addr_t edma_get_position(unsigned slot, bool dst)
+{
+	u32 offs, ctlr = EDMA_CTLR(slot);
+
+	slot = EDMA_CHAN_SLOT(slot);
+
+	offs = PARM_OFFSET(slot);
+	offs += dst ? PARM_DST : PARM_SRC;
+
+	return edma_read(ctlr, offs);
+}
+
+/**
+ * edma_set_src_index - configure DMA source address indexing
+ * @slot: parameter RAM slot being configured
+ * @src_bidx: byte offset between source arrays in a frame
+ * @src_cidx: byte offset between source frames in a block
+ *
+ * Offsets are specified to support either contiguous or discontiguous
+ * memory transfers, or repeated access to a hardware register, as needed.
+ * When accessing hardware registers, both offsets are normally zero.
+ */
+void edma_set_src_index(unsigned slot, s16 src_bidx, s16 src_cidx)
+{
+	unsigned ctlr;
+
+	ctlr = EDMA_CTLR(slot);
+	slot = EDMA_CHAN_SLOT(slot);
+
+	if (slot < edma_cc[ctlr]->num_slots) {
+		edma_parm_modify(ctlr, PARM_SRC_DST_BIDX, slot,
+				0xffff0000, src_bidx);
+		edma_parm_modify(ctlr, PARM_SRC_DST_CIDX, slot,
+				0xffff0000, src_cidx);
+	}
+}
+EXPORT_SYMBOL(edma_set_src_index);
+
+/**
+ * edma_set_dest_index - configure DMA destination address indexing
+ * @slot: parameter RAM slot being configured
+ * @dest_bidx: byte offset between destination arrays in a frame
+ * @dest_cidx: byte offset between destination frames in a block
+ *
+ * Offsets are specified to support either contiguous or discontiguous
+ * memory transfers, or repeated access to a hardware register, as needed.
+ * When accessing hardware registers, both offsets are normally zero.
+ */
+void edma_set_dest_index(unsigned slot, s16 dest_bidx, s16 dest_cidx)
+{
+	unsigned ctlr;
+
+	ctlr = EDMA_CTLR(slot);
+	slot = EDMA_CHAN_SLOT(slot);
+
+	if (slot < edma_cc[ctlr]->num_slots) {
+		edma_parm_modify(ctlr, PARM_SRC_DST_BIDX, slot,
+				0x0000ffff, dest_bidx << 16);
+		edma_parm_modify(ctlr, PARM_SRC_DST_CIDX, slot,
+				0x0000ffff, dest_cidx << 16);
+	}
+}
+EXPORT_SYMBOL(edma_set_dest_index);
+
+/**
+ * edma_set_transfer_params - configure DMA transfer parameters
+ * @slot: parameter RAM slot being configured
+ * @acnt: how many bytes per array (at least one)
+ * @bcnt: how many arrays per frame (at least one)
+ * @ccnt: how many frames per block (at least one)
+ * @bcnt_rld: used only for A-Synchronized transfers; this specifies
+ *	the value to reload into bcnt when it decrements to zero
+ * @sync_mode: ASYNC or ABSYNC
+ *
+ * See the EDMA3 documentation to understand how to configure and link
+ * transfers using the fields in PaRAM slots.  If you are not doing it
+ * all at once with edma_write_slot(), you will use this routine
+ * plus two calls each for source and destination, setting the initial
+ * address and saying how to index that address.
+ *
+ * An example of an A-Synchronized transfer is a serial link using a
+ * single word shift register.  In that case, @acnt would be equal to
+ * that word size; the serial controller issues a DMA synchronization
+ * event to transfer each word, and memory access by the DMA transfer
+ * controller will be word-at-a-time.
+ *
+ * An example of an AB-Synchronized transfer is a device using a FIFO.
+ * In that case, @acnt equals the FIFO width and @bcnt equals its depth.
+ * The controller with the FIFO issues DMA synchronization events when
+ * the FIFO threshold is reached, and the DMA transfer controller will
+ * transfer one frame to (or from) the FIFO.  It will probably use
+ * efficient burst modes to access memory.
+ */
+void edma_set_transfer_params(unsigned slot,
+		u16 acnt, u16 bcnt, u16 ccnt,
+		u16 bcnt_rld, enum sync_dimension sync_mode)
+{
+	unsigned ctlr;
+
+	ctlr = EDMA_CTLR(slot);
+	slot = EDMA_CHAN_SLOT(slot);
+
+	if (slot < edma_cc[ctlr]->num_slots) {
+		edma_parm_modify(ctlr, PARM_LINK_BCNTRLD, slot,
+				0x0000ffff, bcnt_rld << 16);
+		if (sync_mode == ASYNC)
+			edma_parm_and(ctlr, PARM_OPT, slot, ~SYNCDIM);
+		else
+			edma_parm_or(ctlr, PARM_OPT, slot, SYNCDIM);
+		/* Set the acount, bcount, ccount registers */
+		edma_parm_write(ctlr, PARM_A_B_CNT, slot, (bcnt << 16) | acnt);
+		edma_parm_write(ctlr, PARM_CCNT, slot, ccnt);
+	}
+}
+EXPORT_SYMBOL(edma_set_transfer_params);
+
+/**
+ * edma_link - link one parameter RAM slot to another
+ * @from: parameter RAM slot originating the link
+ * @to: parameter RAM slot which is the link target
+ *
+ * The originating slot should not be part of any active DMA transfer.
+ */
+void edma_link(unsigned from, unsigned to)
+{
+	unsigned ctlr_from, ctlr_to;
+
+	ctlr_from = EDMA_CTLR(from);
+	from = EDMA_CHAN_SLOT(from);
+	ctlr_to = EDMA_CTLR(to);
+	to = EDMA_CHAN_SLOT(to);
+
+	if (from >= edma_cc[ctlr_from]->num_slots)
+		return;
+	if (to >= edma_cc[ctlr_to]->num_slots)
+		return;
+	edma_parm_modify(ctlr_from, PARM_LINK_BCNTRLD, from, 0xffff0000,
+				PARM_OFFSET(to));
+}
+EXPORT_SYMBOL(edma_link);
+
+/**
+ * edma_unlink - cut link from one parameter RAM slot
+ * @from: parameter RAM slot originating the link
+ *
+ * The originating slot should not be part of any active DMA transfer.
+ * Its link is set to 0xffff.
+ */
+void edma_unlink(unsigned from)
+{
+	unsigned ctlr;
+
+	ctlr = EDMA_CTLR(from);
+	from = EDMA_CHAN_SLOT(from);
+
+	if (from >= edma_cc[ctlr]->num_slots)
+		return;
+	edma_parm_or(ctlr, PARM_LINK_BCNTRLD, from, 0xffff);
+}
+EXPORT_SYMBOL(edma_unlink);
+
+/*-----------------------------------------------------------------------*/
+
+/* Parameter RAM operations (ii) -- read/write whole parameter sets */
+
+/**
+ * edma_write_slot - write parameter RAM data for slot
+ * @slot: number of parameter RAM slot being modified
+ * @param: data to be written into parameter RAM slot
+ *
+ * Use this to assign all parameters of a transfer at once.  This
+ * allows more efficient setup of transfers than issuing multiple
+ * calls to set up those parameters in small pieces, and provides
+ * complete control over all transfer options.
+ */
+void edma_write_slot(unsigned slot, const struct edmacc_param *param)
+{
+	unsigned ctlr;
+
+	ctlr = EDMA_CTLR(slot);
+	slot = EDMA_CHAN_SLOT(slot);
+
+	if (slot >= edma_cc[ctlr]->num_slots)
+		return;
+	memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(slot), param,
+			PARM_SIZE);
+}
+EXPORT_SYMBOL(edma_write_slot);
+
+/**
+ * edma_read_slot - read parameter RAM data from slot
+ * @slot: number of parameter RAM slot being copied
+ * @param: where to store copy of parameter RAM data
+ *
+ * Use this to read data from a parameter RAM slot, perhaps to
+ * save them as a template for later reuse.
+ */
+void edma_read_slot(unsigned slot, struct edmacc_param *param)
+{
+	unsigned ctlr;
+
+	ctlr = EDMA_CTLR(slot);
+	slot = EDMA_CHAN_SLOT(slot);
+
+	if (slot >= edma_cc[ctlr]->num_slots)
+		return;
+	memcpy_fromio(param, edmacc_regs_base[ctlr] + PARM_OFFSET(slot),
+			PARM_SIZE);
+}
+EXPORT_SYMBOL(edma_read_slot);
+
+/*-----------------------------------------------------------------------*/
+
+/* Various EDMA channel control operations */
+
+/**
+ * edma_pause - pause dma on a channel
+ * @channel: on which edma_start() has been called
+ *
+ * This temporarily disables EDMA hardware events on the specified channel,
+ * preventing them from triggering new transfers on its behalf
+ */
+void edma_pause(unsigned channel)
+{
+	unsigned ctlr;
+
+	ctlr = EDMA_CTLR(channel);
+	channel = EDMA_CHAN_SLOT(channel);
+
+	if (channel < edma_cc[ctlr]->num_channels) {
+		unsigned int mask = BIT(channel & 0x1f);
+
+		edma_shadow0_write_array(ctlr, SH_EECR, channel >> 5, mask);
+	}
+}
+EXPORT_SYMBOL(edma_pause);
+
+/**
+ * edma_resume - resumes dma on a paused channel
+ * @channel: on which edma_pause() has been called
+ *
+ * This re-enables EDMA hardware events on the specified channel.
+ */
+void edma_resume(unsigned channel)
+{
+	unsigned ctlr;
+
+	ctlr = EDMA_CTLR(channel);
+	channel = EDMA_CHAN_SLOT(channel);
+
+	if (channel < edma_cc[ctlr]->num_channels) {
+		unsigned int mask = BIT(channel & 0x1f);
+
+		edma_shadow0_write_array(ctlr, SH_EESR, channel >> 5, mask);
+	}
+}
+EXPORT_SYMBOL(edma_resume);
+
+int edma_trigger_channel(unsigned channel)
+{
+	unsigned ctlr;
+	unsigned int mask;
+
+	ctlr = EDMA_CTLR(channel);
+	channel = EDMA_CHAN_SLOT(channel);
+	mask = BIT(channel & 0x1f);
+
+	edma_shadow0_write_array(ctlr, SH_ESR, (channel >> 5), mask);
+
+	pr_debug("EDMA: ESR%d %08x\n", (channel >> 5),
+		 edma_shadow0_read_array(ctlr, SH_ESR, (channel >> 5)));
+	return 0;
+}
+EXPORT_SYMBOL(edma_trigger_channel);
+
+/**
+ * edma_start - start dma on a channel
+ * @channel: channel being activated
+ *
+ * Channels with event associations will be triggered by their hardware
+ * events, and channels without such associations will be triggered by
+ * software.  (At this writing there is no interface for using software
+ * triggers except with channels that don't support hardware triggers.)
+ *
+ * Returns zero on success, else negative errno.
+ */
+int edma_start(unsigned channel)
+{
+	unsigned ctlr;
+
+	ctlr = EDMA_CTLR(channel);
+	channel = EDMA_CHAN_SLOT(channel);
+
+	if (channel < edma_cc[ctlr]->num_channels) {
+		int j = channel >> 5;
+		unsigned int mask = BIT(channel & 0x1f);
+
+		/* EDMA channels without event association */
+		if (test_bit(channel, edma_cc[ctlr]->edma_unused)) {
+			pr_debug("EDMA: ESR%d %08x\n", j,
+				edma_shadow0_read_array(ctlr, SH_ESR, j));
+			edma_shadow0_write_array(ctlr, SH_ESR, j, mask);
+			return 0;
+		}
+
+		/* EDMA channel with event association */
+		pr_debug("EDMA: ER%d %08x\n", j,
+			edma_shadow0_read_array(ctlr, SH_ER, j));
+		/* Clear any pending event or error */
+		edma_write_array(ctlr, EDMA_ECR, j, mask);
+		edma_write_array(ctlr, EDMA_EMCR, j, mask);
+		/* Clear any SER */
+		edma_shadow0_write_array(ctlr, SH_SECR, j, mask);
+		edma_shadow0_write_array(ctlr, SH_EESR, j, mask);
+		pr_debug("EDMA: EER%d %08x\n", j,
+			edma_shadow0_read_array(ctlr, SH_EER, j));
+		return 0;
+	}
+
+	return -EINVAL;
+}
+EXPORT_SYMBOL(edma_start);
+
+/**
+ * edma_stop - stops dma on the channel passed
+ * @channel: channel being deactivated
+ *
+ * When @lch is a channel, any active transfer is paused and
+ * all pending hardware events are cleared.  The current transfer
+ * may not be resumed, and the channel's Parameter RAM should be
+ * reinitialized before being reused.
+ */
+void edma_stop(unsigned channel)
+{
+	unsigned ctlr;
+
+	ctlr = EDMA_CTLR(channel);
+	channel = EDMA_CHAN_SLOT(channel);
+
+	if (channel < edma_cc[ctlr]->num_channels) {
+		int j = channel >> 5;
+		unsigned int mask = BIT(channel & 0x1f);
+
+		edma_shadow0_write_array(ctlr, SH_EECR, j, mask);
+		edma_shadow0_write_array(ctlr, SH_ECR, j, mask);
+		edma_shadow0_write_array(ctlr, SH_SECR, j, mask);
+		edma_write_array(ctlr, EDMA_EMCR, j, mask);
+
+		pr_debug("EDMA: EER%d %08x\n", j,
+				edma_shadow0_read_array(ctlr, SH_EER, j));
+
+		/* REVISIT:  consider guarding against inappropriate event
+		 * chaining by overwriting with dummy_paramset.
+		 */
+	}
+}
+EXPORT_SYMBOL(edma_stop);
+
+/******************************************************************************
+ *
+ * It cleans ParamEntry qand bring back EDMA to initial state if media has
+ * been removed before EDMA has finished.It is usedful for removable media.
+ * Arguments:
+ *      ch_no     - channel no
+ *
+ * Return: zero on success, or corresponding error no on failure
+ *
+ * FIXME this should not be needed ... edma_stop() should suffice.
+ *
+ *****************************************************************************/
+
+void edma_clean_channel(unsigned channel)
+{
+	unsigned ctlr;
+
+	ctlr = EDMA_CTLR(channel);
+	channel = EDMA_CHAN_SLOT(channel);
+
+	if (channel < edma_cc[ctlr]->num_channels) {
+		int j = (channel >> 5);
+		unsigned int mask = BIT(channel & 0x1f);
+
+		pr_debug("EDMA: EMR%d %08x\n", j,
+				edma_read_array(ctlr, EDMA_EMR, j));
+		edma_shadow0_write_array(ctlr, SH_ECR, j, mask);
+		/* Clear the corresponding EMR bits */
+		edma_write_array(ctlr, EDMA_EMCR, j, mask);
+		/* Clear any SER */
+		edma_shadow0_write_array(ctlr, SH_SECR, j, mask);
+		edma_write(ctlr, EDMA_CCERRCLR, BIT(16) | BIT(1) | BIT(0));
+	}
+}
+EXPORT_SYMBOL(edma_clean_channel);
+
+/*
+ * edma_clear_event - clear an outstanding event on the DMA channel
+ * Arguments:
+ *	channel - channel number
+ */
+void edma_clear_event(unsigned channel)
+{
+	unsigned ctlr;
+
+	ctlr = EDMA_CTLR(channel);
+	channel = EDMA_CHAN_SLOT(channel);
+
+	if (channel >= edma_cc[ctlr]->num_channels)
+		return;
+	if (channel < 32)
+		edma_write(ctlr, EDMA_ECR, BIT(channel));
+	else
+		edma_write(ctlr, EDMA_ECRH, BIT(channel - 32));
+}
+EXPORT_SYMBOL(edma_clear_event);
+
+/*
+ * edma_assign_channel_eventq - move given channel to desired eventq
+ * Arguments:
+ *	channel - channel number
+ *	eventq_no - queue to move the channel
+ *
+ * Can be used to move a channel to a selected event queue.
+ */
+void edma_assign_channel_eventq(unsigned channel, enum dma_event_q eventq_no)
+{
+	unsigned ctlr;
+
+	ctlr = EDMA_CTLR(channel);
+	channel = EDMA_CHAN_SLOT(channel);
+
+	if (channel >= edma_cc[ctlr]->num_channels)
+		return;
+
+	/* default to low priority queue */
+	if (eventq_no == EVENTQ_DEFAULT)
+		eventq_no = edma_cc[ctlr]->default_queue;
+	if (eventq_no >= edma_cc[ctlr]->num_tc)
+		return;
+
+	map_dmach_queue(ctlr, channel, eventq_no);
+}
+EXPORT_SYMBOL(edma_assign_channel_eventq);
+
+static int edma_setup_from_hw(struct device *dev, struct edma_soc_info *pdata,
+			      struct edma *edma_cc, int cc_id)
+{
+	int i;
+	u32 value, cccfg;
+	s8 (*queue_priority_map)[2];
+
+	/* Decode the eDMA3 configuration from CCCFG register */
+	cccfg = edma_read(cc_id, EDMA_CCCFG);
+
+	value = GET_NUM_REGN(cccfg);
+	edma_cc->num_region = BIT(value);
+
+	value = GET_NUM_DMACH(cccfg);
+	edma_cc->num_channels = BIT(value + 1);
+
+	value = GET_NUM_PAENTRY(cccfg);
+	edma_cc->num_slots = BIT(value + 4);
+
+	value = GET_NUM_EVQUE(cccfg);
+	edma_cc->num_tc = value + 1;
+
+	dev_dbg(dev, "eDMA3 CC%d HW configuration (cccfg: 0x%08x):\n", cc_id,
+		cccfg);
+	dev_dbg(dev, "num_region: %u\n", edma_cc->num_region);
+	dev_dbg(dev, "num_channel: %u\n", edma_cc->num_channels);
+	dev_dbg(dev, "num_slot: %u\n", edma_cc->num_slots);
+	dev_dbg(dev, "num_tc: %u\n", edma_cc->num_tc);
+
+	/* Nothing need to be done if queue priority is provided */
+	if (pdata->queue_priority_mapping)
+		return 0;
+
+	/*
+	 * Configure TC/queue priority as follows:
+	 * Q0 - priority 0
+	 * Q1 - priority 1
+	 * Q2 - priority 2
+	 * ...
+	 * The meaning of priority numbers: 0 highest priority, 7 lowest
+	 * priority. So Q0 is the highest priority queue and the last queue has
+	 * the lowest priority.
+	 */
+	queue_priority_map = devm_kzalloc(dev,
+					  (edma_cc->num_tc + 1) * sizeof(s8),
+					  GFP_KERNEL);
+	if (!queue_priority_map)
+		return -ENOMEM;
+
+	for (i = 0; i < edma_cc->num_tc; i++) {
+		queue_priority_map[i][0] = i;
+		queue_priority_map[i][1] = i;
+	}
+	queue_priority_map[i][0] = -1;
+	queue_priority_map[i][1] = -1;
+
+	pdata->queue_priority_mapping = queue_priority_map;
+	/* Default queue has the lowest priority */
+	pdata->default_queue = i - 1;
+
+	return 0;
+}
+
+#if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_DMADEVICES)
+
+static int edma_xbar_event_map(struct device *dev, struct device_node *node,
+			       struct edma_soc_info *pdata, size_t sz)
+{
+	const char pname[] = "ti,edma-xbar-event-map";
+	struct resource res;
+	void __iomem *xbar;
+	s16 (*xbar_chans)[2];
+	size_t nelm = sz / sizeof(s16);
+	u32 shift, offset, mux;
+	int ret, i;
+
+	xbar_chans = devm_kzalloc(dev, (nelm + 2) * sizeof(s16), GFP_KERNEL);
+	if (!xbar_chans)
+		return -ENOMEM;
+
+	ret = of_address_to_resource(node, 1, &res);
+	if (ret)
+		return -ENOMEM;
+
+	xbar = devm_ioremap(dev, res.start, resource_size(&res));
+	if (!xbar)
+		return -ENOMEM;
+
+	ret = of_property_read_u16_array(node, pname, (u16 *)xbar_chans, nelm);
+	if (ret)
+		return -EIO;
+
+	/* Invalidate last entry for the other user of this mess */
+	nelm >>= 1;
+	xbar_chans[nelm][0] = xbar_chans[nelm][1] = -1;
+
+	for (i = 0; i < nelm; i++) {
+		shift = (xbar_chans[i][1] & 0x03) << 3;
+		offset = xbar_chans[i][1] & 0xfffffffc;
+		mux = readl(xbar + offset);
+		mux &= ~(0xff << shift);
+		mux |= xbar_chans[i][0] << shift;
+		writel(mux, (xbar + offset));
+	}
+
+	pdata->xbar_chans = (const s16 (*)[2]) xbar_chans;
+	return 0;
+}
+
+static int edma_of_parse_dt(struct device *dev,
+			    struct device_node *node,
+			    struct edma_soc_info *pdata)
+{
+	int ret = 0;
+	struct property *prop;
+	size_t sz;
+	struct edma_rsv_info *rsv_info;
+
+	rsv_info = devm_kzalloc(dev, sizeof(struct edma_rsv_info), GFP_KERNEL);
+	if (!rsv_info)
+		return -ENOMEM;
+	pdata->rsv = rsv_info;
+
+	prop = of_find_property(node, "ti,edma-xbar-event-map", &sz);
+	if (prop)
+		ret = edma_xbar_event_map(dev, node, pdata, sz);
+
+	return ret;
+}
+
+static struct of_dma_filter_info edma_filter_info = {
+	.filter_fn = edma_filter_fn,
+};
+
+static struct edma_soc_info *edma_setup_info_from_dt(struct device *dev,
+						      struct device_node *node)
+{
+	struct edma_soc_info *info;
+	int ret;
+
+	info = devm_kzalloc(dev, sizeof(struct edma_soc_info), GFP_KERNEL);
+	if (!info)
+		return ERR_PTR(-ENOMEM);
+
+	ret = edma_of_parse_dt(dev, node, info);
+	if (ret)
+		return ERR_PTR(ret);
+
+	dma_cap_set(DMA_SLAVE, edma_filter_info.dma_cap);
+	dma_cap_set(DMA_CYCLIC, edma_filter_info.dma_cap);
+	of_dma_controller_register(dev->of_node, of_dma_simple_xlate,
+				   &edma_filter_info);
+
+	return info;
+}
+#else
+static struct edma_soc_info *edma_setup_info_from_dt(struct device *dev,
+						      struct device_node *node)
+{
+	return ERR_PTR(-ENOSYS);
+}
+#endif
+
+static int edma_probe(struct platform_device *pdev)
+{
+	struct edma_soc_info	**info = pdev->dev.platform_data;
+	struct edma_soc_info    *ninfo[EDMA_MAX_CC] = {NULL};
+	s8		(*queue_priority_mapping)[2];
+	int			i, j, off, ln, found = 0;
+	int			status = -1;
+	const s16		(*rsv_chans)[2];
+	const s16		(*rsv_slots)[2];
+	const s16		(*xbar_chans)[2];
+	int			irq[EDMA_MAX_CC] = {0, 0};
+	int			err_irq[EDMA_MAX_CC] = {0, 0};
+	struct resource		*r[EDMA_MAX_CC] = {NULL};
+	struct resource		res[EDMA_MAX_CC];
+	char			res_name[10];
+	struct device_node	*node = pdev->dev.of_node;
+	struct device		*dev = &pdev->dev;
+	int			ret;
+	struct platform_device_info edma_dev_info = {
+		.name = "edma-dma-engine",
+		.dma_mask = DMA_BIT_MASK(32),
+		.parent = &pdev->dev,
+	};
+
+	if (node) {
+		/* Check if this is a second instance registered */
+		if (arch_num_cc) {
+			dev_err(dev, "only one EDMA instance is supported via DT\n");
+			return -ENODEV;
+		}
+
+		ninfo[0] = edma_setup_info_from_dt(dev, node);
+		if (IS_ERR(ninfo[0])) {
+			dev_err(dev, "failed to get DT data\n");
+			return PTR_ERR(ninfo[0]);
+		}
+
+		info = ninfo;
+	}
+
+	if (!info)
+		return -ENODEV;
+
+	pm_runtime_enable(dev);
+	ret = pm_runtime_get_sync(dev);
+	if (ret < 0) {
+		dev_err(dev, "pm_runtime_get_sync() failed\n");
+		return ret;
+	}
+
+	for (j = 0; j < EDMA_MAX_CC; j++) {
+		if (!info[j]) {
+			if (!found)
+				return -ENODEV;
+			break;
+		}
+		if (node) {
+			ret = of_address_to_resource(node, j, &res[j]);
+			if (!ret)
+				r[j] = &res[j];
+		} else {
+			sprintf(res_name, "edma_cc%d", j);
+			r[j] = platform_get_resource_byname(pdev,
+						IORESOURCE_MEM,
+						res_name);
+		}
+		if (!r[j]) {
+			if (found)
+				break;
+			else
+				return -ENODEV;
+		} else {
+			found = 1;
+		}
+
+		edmacc_regs_base[j] = devm_ioremap_resource(&pdev->dev, r[j]);
+		if (IS_ERR(edmacc_regs_base[j]))
+			return PTR_ERR(edmacc_regs_base[j]);
+
+		edma_cc[j] = devm_kzalloc(&pdev->dev, sizeof(struct edma),
+					  GFP_KERNEL);
+		if (!edma_cc[j])
+			return -ENOMEM;
+
+		/* Get eDMA3 configuration from IP */
+		ret = edma_setup_from_hw(dev, info[j], edma_cc[j], j);
+		if (ret)
+			return ret;
+
+		edma_cc[j]->default_queue = info[j]->default_queue;
+
+		dev_dbg(&pdev->dev, "DMA REG BASE ADDR=%p\n",
+			edmacc_regs_base[j]);
+
+		for (i = 0; i < edma_cc[j]->num_slots; i++)
+			memcpy_toio(edmacc_regs_base[j] + PARM_OFFSET(i),
+					&dummy_paramset, PARM_SIZE);
+
+		/* Mark all channels as unused */
+		memset(edma_cc[j]->edma_unused, 0xff,
+			sizeof(edma_cc[j]->edma_unused));
+
+		if (info[j]->rsv) {
+
+			/* Clear the reserved channels in unused list */
+			rsv_chans = info[j]->rsv->rsv_chans;
+			if (rsv_chans) {
+				for (i = 0; rsv_chans[i][0] != -1; i++) {
+					off = rsv_chans[i][0];
+					ln = rsv_chans[i][1];
+					clear_bits(off, ln,
+						  edma_cc[j]->edma_unused);
+				}
+			}
+
+			/* Set the reserved slots in inuse list */
+			rsv_slots = info[j]->rsv->rsv_slots;
+			if (rsv_slots) {
+				for (i = 0; rsv_slots[i][0] != -1; i++) {
+					off = rsv_slots[i][0];
+					ln = rsv_slots[i][1];
+					set_bits(off, ln,
+						edma_cc[j]->edma_inuse);
+				}
+			}
+		}
+
+		/* Clear the xbar mapped channels in unused list */
+		xbar_chans = info[j]->xbar_chans;
+		if (xbar_chans) {
+			for (i = 0; xbar_chans[i][1] != -1; i++) {
+				off = xbar_chans[i][1];
+				clear_bits(off, 1,
+					   edma_cc[j]->edma_unused);
+			}
+		}
+
+		if (node) {
+			irq[j] = irq_of_parse_and_map(node, 0);
+			err_irq[j] = irq_of_parse_and_map(node, 2);
+		} else {
+			char irq_name[10];
+
+			sprintf(irq_name, "edma%d", j);
+			irq[j] = platform_get_irq_byname(pdev, irq_name);
+
+			sprintf(irq_name, "edma%d_err", j);
+			err_irq[j] = platform_get_irq_byname(pdev, irq_name);
+		}
+		edma_cc[j]->irq_res_start = irq[j];
+		edma_cc[j]->irq_res_end = err_irq[j];
+
+		status = devm_request_irq(dev, irq[j], dma_irq_handler, 0,
+					  "edma", dev);
+		if (status < 0) {
+			dev_dbg(&pdev->dev,
+				"devm_request_irq %d failed --> %d\n",
+				irq[j], status);
+			return status;
+		}
+
+		status = devm_request_irq(dev, err_irq[j], dma_ccerr_handler, 0,
+					  "edma_error", dev);
+		if (status < 0) {
+			dev_dbg(&pdev->dev,
+				"devm_request_irq %d failed --> %d\n",
+				err_irq[j], status);
+			return status;
+		}
+
+		for (i = 0; i < edma_cc[j]->num_channels; i++)
+			map_dmach_queue(j, i, info[j]->default_queue);
+
+		queue_priority_mapping = info[j]->queue_priority_mapping;
+
+		/* Event queue priority mapping */
+		for (i = 0; queue_priority_mapping[i][0] != -1; i++)
+			assign_priority_to_queue(j,
+						queue_priority_mapping[i][0],
+						queue_priority_mapping[i][1]);
+
+		/* Map the channel to param entry if channel mapping logic
+		 * exist
+		 */
+		if (edma_read(j, EDMA_CCCFG) & CHMAP_EXIST)
+			map_dmach_param(j);
+
+		for (i = 0; i < edma_cc[j]->num_region; i++) {
+			edma_write_array2(j, EDMA_DRAE, i, 0, 0x0);
+			edma_write_array2(j, EDMA_DRAE, i, 1, 0x0);
+			edma_write_array(j, EDMA_QRAE, i, 0x0);
+		}
+		edma_cc[j]->info = info[j];
+		arch_num_cc++;
+
+		edma_dev_info.id = j;
+		platform_device_register_full(&edma_dev_info);
+	}
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int edma_pm_resume(struct device *dev)
+{
+	int i, j;
+
+	for (j = 0; j < arch_num_cc; j++) {
+		struct edma *cc = edma_cc[j];
+
+		s8 (*queue_priority_mapping)[2];
+
+		queue_priority_mapping = cc->info->queue_priority_mapping;
+
+		/* Event queue priority mapping */
+		for (i = 0; queue_priority_mapping[i][0] != -1; i++)
+			assign_priority_to_queue(j,
+						 queue_priority_mapping[i][0],
+						 queue_priority_mapping[i][1]);
+
+		/*
+		 * Map the channel to param entry if channel mapping logic
+		 * exist
+		 */
+		if (edma_read(j, EDMA_CCCFG) & CHMAP_EXIST)
+			map_dmach_param(j);
+
+		for (i = 0; i < cc->num_channels; i++) {
+			if (test_bit(i, cc->edma_inuse)) {
+				/* ensure access through shadow region 0 */
+				edma_or_array2(j, EDMA_DRAE, 0, i >> 5,
+					       BIT(i & 0x1f));
+
+				setup_dma_interrupt(i,
+						    cc->intr_data[i].callback,
+						    cc->intr_data[i].data);
+			}
+		}
+	}
+
+	return 0;
+}
+#endif
+
+static const struct dev_pm_ops edma_pm_ops = {
+	SET_LATE_SYSTEM_SLEEP_PM_OPS(NULL, edma_pm_resume)
+};
+
+static struct platform_driver edma_driver = {
+	.driver = {
+		.name	= "edma",
+		.pm	= &edma_pm_ops,
+		.of_match_table = edma_of_ids,
+	},
+	.probe = edma_probe,
+};
+
+static int __init edma_init(void)
+{
+	return platform_driver_probe(&edma_driver, edma_probe);
+}
+arch_initcall(edma_init);
+
diff --git a/kernel/arch/arm/common/firmware.c b/kernel/arch/arm/common/firmware.c
new file mode 100644
index 000000000..27ddccb11
--- /dev/null
+++ b/kernel/arch/arm/common/firmware.c
@@ -0,0 +1,18 @@
+/*
+ * Copyright (C) 2012 Samsung Electronics.
+ * Kyungmin Park <kyungmin.park@samsung.com>
+ * Tomasz Figa <t.figa@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/suspend.h>
+
+#include <asm/firmware.h>
+
+static const struct firmware_ops default_firmware_ops;
+
+const struct firmware_ops *firmware_ops = &default_firmware_ops;
diff --git a/kernel/arch/arm/common/icst.c b/kernel/arch/arm/common/icst.c
new file mode 100644
index 000000000..2dc6da70a
--- /dev/null
+++ b/kernel/arch/arm/common/icst.c
@@ -0,0 +1,100 @@
+/*
+ *  linux/arch/arm/common/icst307.c
+ *
+ *  Copyright (C) 2003 Deep Blue Solutions, Ltd, All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ *  Support functions for calculating clocks/divisors for the ICST307
+ *  clock generators.  See http://www.idt.com/ for more information
+ *  on these devices.
+ *
+ *  This is an almost identical implementation to the ICST525 clock generator.
+ *  The s2div and idx2s files are different
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+
+#include <asm/hardware/icst.h>
+
+/*
+ * Divisors for each OD setting.
+ */
+const unsigned char icst307_s2div[8] = { 10, 2, 8, 4, 5, 7, 3, 6 };
+const unsigned char icst525_s2div[8] = { 10, 2, 8, 4, 5, 7, 9, 6 };
+EXPORT_SYMBOL(icst307_s2div);
+EXPORT_SYMBOL(icst525_s2div);
+
+unsigned long icst_hz(const struct icst_params *p, struct icst_vco vco)
+{
+	return p->ref * 2 * (vco.v + 8) / ((vco.r + 2) * p->s2div[vco.s]);
+}
+
+EXPORT_SYMBOL(icst_hz);
+
+/*
+ * Ascending divisor S values.
+ */
+const unsigned char icst307_idx2s[8] = { 1, 6, 3, 4, 7, 5, 2, 0 };
+const unsigned char icst525_idx2s[8] = { 1, 3, 4, 7, 5, 2, 6, 0 };
+EXPORT_SYMBOL(icst307_idx2s);
+EXPORT_SYMBOL(icst525_idx2s);
+
+struct icst_vco
+icst_hz_to_vco(const struct icst_params *p, unsigned long freq)
+{
+	struct icst_vco vco = { .s = 1, .v = p->vd_max, .r = p->rd_max };
+	unsigned long f;
+	unsigned int i = 0, rd, best = (unsigned int)-1;
+
+	/*
+	 * First, find the PLL output divisor such
+	 * that the PLL output is within spec.
+	 */
+	do {
+		f = freq * p->s2div[p->idx2s[i]];
+
+		if (f > p->vco_min && f <= p->vco_max)
+			break;
+	} while (i < 8);
+
+	if (i >= 8)
+		return vco;
+
+	vco.s = p->idx2s[i];
+
+	/*
+	 * Now find the closest divisor combination
+	 * which gives a PLL output of 'f'.
+	 */
+	for (rd = p->rd_min; rd <= p->rd_max; rd++) {
+		unsigned long fref_div, f_pll;
+		unsigned int vd;
+		int f_diff;
+
+		fref_div = (2 * p->ref) / rd;
+
+		vd = (f + fref_div / 2) / fref_div;
+		if (vd < p->vd_min || vd > p->vd_max)
+			continue;
+
+		f_pll = fref_div * vd;
+		f_diff = f_pll - f;
+		if (f_diff < 0)
+			f_diff = -f_diff;
+
+		if ((unsigned)f_diff < best) {
+			vco.v = vd - 8;
+			vco.r = rd - 2;
+			if (f_diff == 0)
+				break;
+			best = f_diff;
+		}
+	}
+
+	return vco;
+}
+
+EXPORT_SYMBOL(icst_hz_to_vco);
diff --git a/kernel/arch/arm/common/it8152.c b/kernel/arch/arm/common/it8152.c
new file mode 100644
index 000000000..5114b68e9
--- /dev/null
+++ b/kernel/arch/arm/common/it8152.c
@@ -0,0 +1,355 @@
+/*
+ * linux/arch/arm/common/it8152.c
+ *
+ * Copyright Compulab Ltd, 2002-2007
+ * Mike Rapoport <mike@compulab.co.il>
+ *
+ * The DMA bouncing part is taken from arch/arm/mach-ixp4xx/common-pci.c
+ * (see this file for respective copyrights)
+ *
+ * Thanks to Guennadi Liakhovetski <gl@dsa-ac.de> for IRQ enumberation
+ * and demux code.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/ptrace.h>
+#include <linux/interrupt.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/export.h>
+
+#include <asm/mach/pci.h>
+#include <asm/hardware/it8152.h>
+
+#define MAX_SLOTS		21
+
+static void it8152_mask_irq(struct irq_data *d)
+{
+	unsigned int irq = d->irq;
+
+       if (irq >= IT8152_LD_IRQ(0)) {
+	       __raw_writel((__raw_readl(IT8152_INTC_LDCNIMR) |
+			    (1 << (irq - IT8152_LD_IRQ(0)))),
+			    IT8152_INTC_LDCNIMR);
+       } else if (irq >= IT8152_LP_IRQ(0)) {
+	       __raw_writel((__raw_readl(IT8152_INTC_LPCNIMR) |
+			    (1 << (irq - IT8152_LP_IRQ(0)))),
+			    IT8152_INTC_LPCNIMR);
+       } else if (irq >= IT8152_PD_IRQ(0)) {
+	       __raw_writel((__raw_readl(IT8152_INTC_PDCNIMR) |
+			    (1 << (irq - IT8152_PD_IRQ(0)))),
+			    IT8152_INTC_PDCNIMR);
+       }
+}
+
+static void it8152_unmask_irq(struct irq_data *d)
+{
+	unsigned int irq = d->irq;
+
+       if (irq >= IT8152_LD_IRQ(0)) {
+	       __raw_writel((__raw_readl(IT8152_INTC_LDCNIMR) &
+			     ~(1 << (irq - IT8152_LD_IRQ(0)))),
+			    IT8152_INTC_LDCNIMR);
+       } else if (irq >= IT8152_LP_IRQ(0)) {
+	       __raw_writel((__raw_readl(IT8152_INTC_LPCNIMR) &
+			     ~(1 << (irq - IT8152_LP_IRQ(0)))),
+			    IT8152_INTC_LPCNIMR);
+       } else if (irq >= IT8152_PD_IRQ(0)) {
+	       __raw_writel((__raw_readl(IT8152_INTC_PDCNIMR) &
+			     ~(1 << (irq - IT8152_PD_IRQ(0)))),
+			    IT8152_INTC_PDCNIMR);
+       }
+}
+
+static struct irq_chip it8152_irq_chip = {
+	.name		= "it8152",
+	.irq_ack	= it8152_mask_irq,
+	.irq_mask	= it8152_mask_irq,
+	.irq_unmask	= it8152_unmask_irq,
+};
+
+void it8152_init_irq(void)
+{
+	int irq;
+
+	__raw_writel((0xffff), IT8152_INTC_PDCNIMR);
+	__raw_writel((0), IT8152_INTC_PDCNIRR);
+	__raw_writel((0xffff), IT8152_INTC_LPCNIMR);
+	__raw_writel((0), IT8152_INTC_LPCNIRR);
+	__raw_writel((0xffff), IT8152_INTC_LDCNIMR);
+	__raw_writel((0), IT8152_INTC_LDCNIRR);
+
+	for (irq = IT8152_IRQ(0); irq <= IT8152_LAST_IRQ; irq++) {
+		irq_set_chip_and_handler(irq, &it8152_irq_chip,
+					 handle_level_irq);
+		set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
+	}
+}
+
+void it8152_irq_demux(unsigned int irq, struct irq_desc *desc)
+{
+       int bits_pd, bits_lp, bits_ld;
+       int i;
+
+       while (1) {
+	       /* Read all */
+	       bits_pd = __raw_readl(IT8152_INTC_PDCNIRR);
+	       bits_lp = __raw_readl(IT8152_INTC_LPCNIRR);
+	       bits_ld = __raw_readl(IT8152_INTC_LDCNIRR);
+
+	       /* Ack */
+	       __raw_writel((~bits_pd), IT8152_INTC_PDCNIRR);
+	       __raw_writel((~bits_lp), IT8152_INTC_LPCNIRR);
+	       __raw_writel((~bits_ld), IT8152_INTC_LDCNIRR);
+
+	       if (!(bits_ld | bits_lp | bits_pd)) {
+		       /* Re-read to guarantee, that there was a moment of
+			  time, when they all three were 0. */
+		       bits_pd = __raw_readl(IT8152_INTC_PDCNIRR);
+		       bits_lp = __raw_readl(IT8152_INTC_LPCNIRR);
+		       bits_ld = __raw_readl(IT8152_INTC_LDCNIRR);
+		       if (!(bits_ld | bits_lp | bits_pd))
+			       return;
+	       }
+
+	       bits_pd &= ((1 << IT8152_PD_IRQ_COUNT) - 1);
+	       while (bits_pd) {
+		       i = __ffs(bits_pd);
+		       generic_handle_irq(IT8152_PD_IRQ(i));
+		       bits_pd &= ~(1 << i);
+	       }
+
+	       bits_lp &= ((1 << IT8152_LP_IRQ_COUNT) - 1);
+	       while (bits_lp) {
+		       i = __ffs(bits_lp);
+		       generic_handle_irq(IT8152_LP_IRQ(i));
+		       bits_lp &= ~(1 << i);
+	       }
+
+	       bits_ld &= ((1 << IT8152_LD_IRQ_COUNT) - 1);
+	       while (bits_ld) {
+		       i = __ffs(bits_ld);
+		       generic_handle_irq(IT8152_LD_IRQ(i));
+		       bits_ld &= ~(1 << i);
+	       }
+       }
+}
+
+/* mapping for on-chip devices */
+int __init it8152_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+	if ((dev->vendor == PCI_VENDOR_ID_ITE) &&
+	    (dev->device == PCI_DEVICE_ID_ITE_8152)) {
+		if ((dev->class >> 8) == PCI_CLASS_MULTIMEDIA_AUDIO)
+			return IT8152_AUDIO_INT;
+		if ((dev->class >> 8) == PCI_CLASS_SERIAL_USB)
+			return IT8152_USB_INT;
+		if ((dev->class >> 8) == PCI_CLASS_SYSTEM_DMA)
+			return IT8152_CDMA_INT;
+	}
+
+	return 0;
+}
+
+static unsigned long it8152_pci_dev_base_address(struct pci_bus *bus,
+						 unsigned int devfn)
+{
+	unsigned long addr = 0;
+
+	if (bus->number == 0) {
+			if (devfn < PCI_DEVFN(MAX_SLOTS, 0))
+				addr = (devfn << 8);
+	} else
+		addr = (bus->number << 16) | (devfn << 8);
+
+	return addr;
+}
+
+static int it8152_pci_read_config(struct pci_bus *bus,
+				  unsigned int devfn, int where,
+				  int size, u32 *value)
+{
+	unsigned long addr = it8152_pci_dev_base_address(bus, devfn);
+	u32 v;
+	int shift;
+
+	shift = (where & 3);
+
+	__raw_writel((addr + where), IT8152_PCI_CFG_ADDR);
+	v = (__raw_readl(IT8152_PCI_CFG_DATA)  >> (8 * (shift)));
+
+	*value = v;
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int it8152_pci_write_config(struct pci_bus *bus,
+				   unsigned int devfn, int where,
+				   int size, u32 value)
+{
+	unsigned long addr = it8152_pci_dev_base_address(bus, devfn);
+	u32 v, vtemp, mask = 0;
+	int shift;
+
+	if (size == 1)
+		mask = 0xff;
+	if (size == 2)
+		mask = 0xffff;
+
+	shift = (where & 3);
+
+	__raw_writel((addr + where), IT8152_PCI_CFG_ADDR);
+	vtemp = __raw_readl(IT8152_PCI_CFG_DATA);
+
+	if (mask)
+		vtemp &= ~(mask << (8 * shift));
+	else
+		vtemp = 0;
+
+	v = (value << (8 * shift));
+	__raw_writel((addr + where), IT8152_PCI_CFG_ADDR);
+	__raw_writel((v | vtemp), IT8152_PCI_CFG_DATA);
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+struct pci_ops it8152_ops = {
+	.read = it8152_pci_read_config,
+	.write = it8152_pci_write_config,
+};
+
+static struct resource it8152_io = {
+	.name	= "IT8152 PCI I/O region",
+	.flags	= IORESOURCE_IO,
+};
+
+static struct resource it8152_mem = {
+	.name	= "IT8152 PCI memory region",
+	.start	= 0x10000000,
+	.end	= 0x13e00000,
+	.flags	= IORESOURCE_MEM,
+};
+
+/*
+ * The following functions are needed for DMA bouncing.
+ * ITE8152 chip can address up to 64MByte, so all the devices
+ * connected to ITE8152 (PCI and USB) should have limited DMA window
+ */
+static int it8152_needs_bounce(struct device *dev, dma_addr_t dma_addr, size_t size)
+{
+	dev_dbg(dev, "%s: dma_addr %08x, size %08x\n",
+		__func__, dma_addr, size);
+	return (dma_addr + size - PHYS_OFFSET) >= SZ_64M;
+}
+
+/*
+ * Setup DMA mask to 64MB on devices connected to ITE8152. Ignore all
+ * other devices.
+ */
+static int it8152_pci_platform_notify(struct device *dev)
+{
+	if (dev_is_pci(dev)) {
+		if (dev->dma_mask)
+			*dev->dma_mask = (SZ_64M - 1) | PHYS_OFFSET;
+		dev->coherent_dma_mask = (SZ_64M - 1) | PHYS_OFFSET;
+		dmabounce_register_dev(dev, 2048, 4096, it8152_needs_bounce);
+	}
+	return 0;
+}
+
+static int it8152_pci_platform_notify_remove(struct device *dev)
+{
+	if (dev_is_pci(dev))
+		dmabounce_unregister_dev(dev);
+
+	return 0;
+}
+
+int dma_set_coherent_mask(struct device *dev, u64 mask)
+{
+	if (mask >= PHYS_OFFSET + SZ_64M - 1)
+		return 0;
+
+	return -EIO;
+}
+
+int __init it8152_pci_setup(int nr, struct pci_sys_data *sys)
+{
+	/*
+	 * FIXME: use pci_ioremap_io to remap the IO space here and
+	 * move over to the generic io.h implementation.
+	 * This requires solving the same problem for PXA PCMCIA
+	 * support.
+	 */
+	it8152_io.start = (unsigned long)IT8152_IO_BASE + 0x12000;
+	it8152_io.end	= (unsigned long)IT8152_IO_BASE + 0x12000 + 0x100000;
+
+	sys->mem_offset = 0x10000000;
+	sys->io_offset  = (unsigned long)IT8152_IO_BASE;
+
+	if (request_resource(&ioport_resource, &it8152_io)) {
+		printk(KERN_ERR "PCI: unable to allocate IO region\n");
+		goto err0;
+	}
+	if (request_resource(&iomem_resource, &it8152_mem)) {
+		printk(KERN_ERR "PCI: unable to allocate memory region\n");
+		goto err1;
+	}
+
+	pci_add_resource_offset(&sys->resources, &it8152_io, sys->io_offset);
+	pci_add_resource_offset(&sys->resources, &it8152_mem, sys->mem_offset);
+
+	if (platform_notify || platform_notify_remove) {
+		printk(KERN_ERR "PCI: Can't use platform_notify\n");
+		goto err2;
+	}
+
+	platform_notify = it8152_pci_platform_notify;
+	platform_notify_remove = it8152_pci_platform_notify_remove;
+
+	return 1;
+
+err2:
+	release_resource(&it8152_io);
+err1:
+	release_resource(&it8152_mem);
+err0:
+	return -EBUSY;
+}
+
+/* ITE bridge requires setting latency timer to avoid early bus access
+   termination by PCI bus master devices
+*/
+void pcibios_set_master(struct pci_dev *dev)
+{
+	u8 lat;
+
+	/* no need to update on-chip OHCI controller */
+	if ((dev->vendor == PCI_VENDOR_ID_ITE) &&
+	    (dev->device == PCI_DEVICE_ID_ITE_8152) &&
+	    ((dev->class >> 8) == PCI_CLASS_SERIAL_USB))
+		return;
+
+	pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
+	if (lat < 16)
+		lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency;
+	else if (lat > pcibios_max_latency)
+		lat = pcibios_max_latency;
+	else
+		return;
+	printk(KERN_DEBUG "PCI: Setting latency timer of device %s to %d\n",
+	       pci_name(dev), lat);
+	pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
+}
+
+
+EXPORT_SYMBOL(dma_set_coherent_mask);
diff --git a/kernel/arch/arm/common/locomo.c b/kernel/arch/arm/common/locomo.c
new file mode 100644
index 000000000..b55c3625d
--- /dev/null
+++ b/kernel/arch/arm/common/locomo.c
@@ -0,0 +1,914 @@
+/*
+ * linux/arch/arm/common/locomo.c
+ *
+ * Sharp LoCoMo support
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This file contains all generic LoCoMo support.
+ *
+ * All initialization functions provided here are intended to be called
+ * from machine specific code with proper arguments when required.
+ *
+ * Based on sa1111.c
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/io.h>
+
+#include <mach/hardware.h>
+#include <asm/irq.h>
+#include <asm/mach/irq.h>
+
+#include <asm/hardware/locomo.h>
+
+/* LoCoMo Interrupts */
+#define IRQ_LOCOMO_KEY		(0)
+#define IRQ_LOCOMO_GPIO		(1)
+#define IRQ_LOCOMO_LT		(2)
+#define IRQ_LOCOMO_SPI		(3)
+
+/* M62332 output channel selection */
+#define M62332_EVR_CH	1	/* M62332 volume channel number  */
+				/*   0 : CH.1 , 1 : CH. 2        */
+/* DAC send data */
+#define	M62332_SLAVE_ADDR	0x4e	/* Slave address  */
+#define	M62332_W_BIT		0x00	/* W bit (0 only) */
+#define	M62332_SUB_ADDR		0x00	/* Sub address    */
+#define	M62332_A_BIT		0x00	/* A bit (0 only) */
+
+/* DAC setup and hold times (expressed in us) */
+#define DAC_BUS_FREE_TIME	5	/*   4.7 us */
+#define DAC_START_SETUP_TIME	5	/*   4.7 us */
+#define DAC_STOP_SETUP_TIME	4	/*   4.0 us */
+#define DAC_START_HOLD_TIME	5	/*   4.7 us */
+#define DAC_SCL_LOW_HOLD_TIME	5	/*   4.7 us */
+#define DAC_SCL_HIGH_HOLD_TIME	4	/*   4.0 us */
+#define DAC_DATA_SETUP_TIME	1	/*   250 ns */
+#define DAC_DATA_HOLD_TIME	1	/*   300 ns */
+#define DAC_LOW_SETUP_TIME	1	/*   300 ns */
+#define DAC_HIGH_SETUP_TIME	1	/*  1000 ns */
+
+/* the following is the overall data for the locomo chip */
+struct locomo {
+	struct device *dev;
+	unsigned long phys;
+	unsigned int irq;
+	int irq_base;
+	spinlock_t lock;
+	void __iomem *base;
+#ifdef CONFIG_PM
+	void *saved_state;
+#endif
+};
+
+struct locomo_dev_info {
+	unsigned long	offset;
+	unsigned long	length;
+	unsigned int	devid;
+	unsigned int	irq[1];
+	const char *	name;
+};
+
+/* All the locomo devices.  If offset is non-zero, the mapbase for the
+ * locomo_dev will be set to the chip base plus offset.  If offset is
+ * zero, then the mapbase for the locomo_dev will be set to zero.  An
+ * offset of zero means the device only uses GPIOs or other helper
+ * functions inside this file */
+static struct locomo_dev_info locomo_devices[] = {
+	{
+		.devid 		= LOCOMO_DEVID_KEYBOARD,
+		.irq		= { IRQ_LOCOMO_KEY },
+		.name		= "locomo-keyboard",
+		.offset		= LOCOMO_KEYBOARD,
+		.length		= 16,
+	},
+	{
+		.devid		= LOCOMO_DEVID_FRONTLIGHT,
+		.irq		= {},
+		.name		= "locomo-frontlight",
+		.offset		= LOCOMO_FRONTLIGHT,
+		.length		= 8,
+
+	},
+	{
+		.devid		= LOCOMO_DEVID_BACKLIGHT,
+		.irq		= {},
+		.name		= "locomo-backlight",
+		.offset		= LOCOMO_BACKLIGHT,
+		.length		= 8,
+	},
+	{
+		.devid		= LOCOMO_DEVID_AUDIO,
+		.irq		= {},
+		.name		= "locomo-audio",
+		.offset		= LOCOMO_AUDIO,
+		.length		= 4,
+	},
+	{
+		.devid		= LOCOMO_DEVID_LED,
+		.irq 		= {},
+		.name		= "locomo-led",
+		.offset		= LOCOMO_LED,
+		.length		= 8,
+	},
+	{
+		.devid		= LOCOMO_DEVID_UART,
+		.irq		= {},
+		.name		= "locomo-uart",
+		.offset		= 0,
+		.length		= 0,
+	},
+	{
+		.devid		= LOCOMO_DEVID_SPI,
+		.irq		= {},
+		.name		= "locomo-spi",
+		.offset		= LOCOMO_SPI,
+		.length		= 0x30,
+	},
+};
+
+static void locomo_handler(unsigned int irq, struct irq_desc *desc)
+{
+	struct locomo *lchip = irq_get_chip_data(irq);
+	int req, i;
+
+	/* Acknowledge the parent IRQ */
+	desc->irq_data.chip->irq_ack(&desc->irq_data);
+
+	/* check why this interrupt was generated */
+	req = locomo_readl(lchip->base + LOCOMO_ICR) & 0x0f00;
+
+	if (req) {
+		/* generate the next interrupt(s) */
+		irq = lchip->irq_base;
+		for (i = 0; i <= 3; i++, irq++) {
+			if (req & (0x0100 << i)) {
+				generic_handle_irq(irq);
+			}
+
+		}
+	}
+}
+
+static void locomo_ack_irq(struct irq_data *d)
+{
+}
+
+static void locomo_mask_irq(struct irq_data *d)
+{
+	struct locomo *lchip = irq_data_get_irq_chip_data(d);
+	unsigned int r;
+	r = locomo_readl(lchip->base + LOCOMO_ICR);
+	r &= ~(0x0010 << (d->irq - lchip->irq_base));
+	locomo_writel(r, lchip->base + LOCOMO_ICR);
+}
+
+static void locomo_unmask_irq(struct irq_data *d)
+{
+	struct locomo *lchip = irq_data_get_irq_chip_data(d);
+	unsigned int r;
+	r = locomo_readl(lchip->base + LOCOMO_ICR);
+	r |= (0x0010 << (d->irq - lchip->irq_base));
+	locomo_writel(r, lchip->base + LOCOMO_ICR);
+}
+
+static struct irq_chip locomo_chip = {
+	.name		= "LOCOMO",
+	.irq_ack	= locomo_ack_irq,
+	.irq_mask	= locomo_mask_irq,
+	.irq_unmask	= locomo_unmask_irq,
+};
+
+static void locomo_setup_irq(struct locomo *lchip)
+{
+	int irq = lchip->irq_base;
+
+	/*
+	 * Install handler for IRQ_LOCOMO_HW.
+	 */
+	irq_set_irq_type(lchip->irq, IRQ_TYPE_EDGE_FALLING);
+	irq_set_chip_data(lchip->irq, lchip);
+	irq_set_chained_handler(lchip->irq, locomo_handler);
+
+	/* Install handlers for IRQ_LOCOMO_* */
+	for ( ; irq <= lchip->irq_base + 3; irq++) {
+		irq_set_chip_and_handler(irq, &locomo_chip, handle_level_irq);
+		irq_set_chip_data(irq, lchip);
+		set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
+	}
+}
+
+
+static void locomo_dev_release(struct device *_dev)
+{
+	struct locomo_dev *dev = LOCOMO_DEV(_dev);
+
+	kfree(dev);
+}
+
+static int
+locomo_init_one_child(struct locomo *lchip, struct locomo_dev_info *info)
+{
+	struct locomo_dev *dev;
+	int ret;
+
+	dev = kzalloc(sizeof(struct locomo_dev), GFP_KERNEL);
+	if (!dev) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	/*
+	 * If the parent device has a DMA mask associated with it,
+	 * propagate it down to the children.
+	 */
+	if (lchip->dev->dma_mask) {
+		dev->dma_mask = *lchip->dev->dma_mask;
+		dev->dev.dma_mask = &dev->dma_mask;
+	}
+
+	dev_set_name(&dev->dev, "%s", info->name);
+	dev->devid	 = info->devid;
+	dev->dev.parent  = lchip->dev;
+	dev->dev.bus     = &locomo_bus_type;
+	dev->dev.release = locomo_dev_release;
+	dev->dev.coherent_dma_mask = lchip->dev->coherent_dma_mask;
+
+	if (info->offset)
+		dev->mapbase = lchip->base + info->offset;
+	else
+		dev->mapbase = 0;
+	dev->length = info->length;
+
+	dev->irq[0] = (lchip->irq_base == NO_IRQ) ?
+			NO_IRQ : lchip->irq_base + info->irq[0];
+
+	ret = device_register(&dev->dev);
+	if (ret) {
+ out:
+		kfree(dev);
+	}
+	return ret;
+}
+
+#ifdef CONFIG_PM
+
+struct locomo_save_data {
+	u16	LCM_GPO;
+	u16	LCM_SPICT;
+	u16	LCM_GPE;
+	u16	LCM_ASD;
+	u16	LCM_SPIMD;
+};
+
+static int locomo_suspend(struct platform_device *dev, pm_message_t state)
+{
+	struct locomo *lchip = platform_get_drvdata(dev);
+	struct locomo_save_data *save;
+	unsigned long flags;
+
+	save = kmalloc(sizeof(struct locomo_save_data), GFP_KERNEL);
+	if (!save)
+		return -ENOMEM;
+
+	lchip->saved_state = save;
+
+	spin_lock_irqsave(&lchip->lock, flags);
+
+	save->LCM_GPO     = locomo_readl(lchip->base + LOCOMO_GPO);	/* GPIO */
+	locomo_writel(0x00, lchip->base + LOCOMO_GPO);
+	save->LCM_SPICT   = locomo_readl(lchip->base + LOCOMO_SPI + LOCOMO_SPICT);	/* SPI */
+	locomo_writel(0x40, lchip->base + LOCOMO_SPI + LOCOMO_SPICT);
+	save->LCM_GPE     = locomo_readl(lchip->base + LOCOMO_GPE);	/* GPIO */
+	locomo_writel(0x00, lchip->base + LOCOMO_GPE);
+	save->LCM_ASD     = locomo_readl(lchip->base + LOCOMO_ASD);	/* ADSTART */
+	locomo_writel(0x00, lchip->base + LOCOMO_ASD);
+	save->LCM_SPIMD   = locomo_readl(lchip->base + LOCOMO_SPI + LOCOMO_SPIMD);	/* SPI */
+	locomo_writel(0x3C14, lchip->base + LOCOMO_SPI + LOCOMO_SPIMD);
+
+	locomo_writel(0x00, lchip->base + LOCOMO_PAIF);
+	locomo_writel(0x00, lchip->base + LOCOMO_DAC);
+	locomo_writel(0x00, lchip->base + LOCOMO_BACKLIGHT + LOCOMO_TC);
+
+	if ((locomo_readl(lchip->base + LOCOMO_LED + LOCOMO_LPT0) & 0x88) && (locomo_readl(lchip->base + LOCOMO_LED + LOCOMO_LPT1) & 0x88))
+		locomo_writel(0x00, lchip->base + LOCOMO_C32K); 	/* CLK32 off */
+	else
+		/* 18MHz already enabled, so no wait */
+		locomo_writel(0xc1, lchip->base + LOCOMO_C32K); 	/* CLK32 on */
+
+	locomo_writel(0x00, lchip->base + LOCOMO_TADC);		/* 18MHz clock off*/
+	locomo_writel(0x00, lchip->base + LOCOMO_AUDIO + LOCOMO_ACC);			/* 22MHz/24MHz clock off */
+	locomo_writel(0x00, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);			/* FL */
+
+	spin_unlock_irqrestore(&lchip->lock, flags);
+
+	return 0;
+}
+
+static int locomo_resume(struct platform_device *dev)
+{
+	struct locomo *lchip = platform_get_drvdata(dev);
+	struct locomo_save_data *save;
+	unsigned long r;
+	unsigned long flags;
+
+	save = lchip->saved_state;
+	if (!save)
+		return 0;
+
+	spin_lock_irqsave(&lchip->lock, flags);
+
+	locomo_writel(save->LCM_GPO, lchip->base + LOCOMO_GPO);
+	locomo_writel(save->LCM_SPICT, lchip->base + LOCOMO_SPI + LOCOMO_SPICT);
+	locomo_writel(save->LCM_GPE, lchip->base + LOCOMO_GPE);
+	locomo_writel(save->LCM_ASD, lchip->base + LOCOMO_ASD);
+	locomo_writel(save->LCM_SPIMD, lchip->base + LOCOMO_SPI + LOCOMO_SPIMD);
+
+	locomo_writel(0x00, lchip->base + LOCOMO_C32K);
+	locomo_writel(0x90, lchip->base + LOCOMO_TADC);
+
+	locomo_writel(0, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KSC);
+	r = locomo_readl(lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
+	r &= 0xFEFF;
+	locomo_writel(r, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
+	locomo_writel(0x1, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KCMD);
+
+	spin_unlock_irqrestore(&lchip->lock, flags);
+
+	lchip->saved_state = NULL;
+	kfree(save);
+
+	return 0;
+}
+#endif
+
+
+/**
+ *	locomo_probe - probe for a single LoCoMo chip.
+ *	@phys_addr: physical address of device.
+ *
+ *	Probe for a LoCoMo chip.  This must be called
+ *	before any other locomo-specific code.
+ *
+ *	Returns:
+ *	%-ENODEV	device not found.
+ *	%-EBUSY		physical address already marked in-use.
+ *	%0		successful.
+ */
+static int
+__locomo_probe(struct device *me, struct resource *mem, int irq)
+{
+	struct locomo_platform_data *pdata = me->platform_data;
+	struct locomo *lchip;
+	unsigned long r;
+	int i, ret = -ENODEV;
+
+	lchip = kzalloc(sizeof(struct locomo), GFP_KERNEL);
+	if (!lchip)
+		return -ENOMEM;
+
+	spin_lock_init(&lchip->lock);
+
+	lchip->dev = me;
+	dev_set_drvdata(lchip->dev, lchip);
+
+	lchip->phys = mem->start;
+	lchip->irq = irq;
+	lchip->irq_base = (pdata) ? pdata->irq_base : NO_IRQ;
+
+	/*
+	 * Map the whole region.  This also maps the
+	 * registers for our children.
+	 */
+	lchip->base = ioremap(mem->start, PAGE_SIZE);
+	if (!lchip->base) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	/* locomo initialize */
+	locomo_writel(0, lchip->base + LOCOMO_ICR);
+	/* KEYBOARD */
+	locomo_writel(0, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
+
+	/* GPIO */
+	locomo_writel(0, lchip->base + LOCOMO_GPO);
+	locomo_writel((LOCOMO_GPIO(1) | LOCOMO_GPIO(2) | LOCOMO_GPIO(13) | LOCOMO_GPIO(14))
+			, lchip->base + LOCOMO_GPE);
+	locomo_writel((LOCOMO_GPIO(1) | LOCOMO_GPIO(2) | LOCOMO_GPIO(13) | LOCOMO_GPIO(14))
+			, lchip->base + LOCOMO_GPD);
+	locomo_writel(0, lchip->base + LOCOMO_GIE);
+
+	/* Frontlight */
+	locomo_writel(0, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
+	locomo_writel(0, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALD);
+
+	/* Longtime timer */
+	locomo_writel(0, lchip->base + LOCOMO_LTINT);
+	/* SPI */
+	locomo_writel(0, lchip->base + LOCOMO_SPI + LOCOMO_SPIIE);
+
+	locomo_writel(6 + 8 + 320 + 30 - 10, lchip->base + LOCOMO_ASD);
+	r = locomo_readl(lchip->base + LOCOMO_ASD);
+	r |= 0x8000;
+	locomo_writel(r, lchip->base + LOCOMO_ASD);
+
+	locomo_writel(6 + 8 + 320 + 30 - 10 - 128 + 4, lchip->base + LOCOMO_HSD);
+	r = locomo_readl(lchip->base + LOCOMO_HSD);
+	r |= 0x8000;
+	locomo_writel(r, lchip->base + LOCOMO_HSD);
+
+	locomo_writel(128 / 8, lchip->base + LOCOMO_HSC);
+
+	/* XON */
+	locomo_writel(0x80, lchip->base + LOCOMO_TADC);
+	udelay(1000);
+	/* CLK9MEN */
+	r = locomo_readl(lchip->base + LOCOMO_TADC);
+	r |= 0x10;
+	locomo_writel(r, lchip->base + LOCOMO_TADC);
+	udelay(100);
+
+	/* init DAC */
+	r = locomo_readl(lchip->base + LOCOMO_DAC);
+	r |= LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
+	locomo_writel(r, lchip->base + LOCOMO_DAC);
+
+	r = locomo_readl(lchip->base + LOCOMO_VER);
+	printk(KERN_INFO "LoCoMo Chip: %lu%lu\n", (r >> 8), (r & 0xff));
+
+	/*
+	 * The interrupt controller must be initialised before any
+	 * other device to ensure that the interrupts are available.
+	 */
+	if (lchip->irq != NO_IRQ && lchip->irq_base != NO_IRQ)
+		locomo_setup_irq(lchip);
+
+	for (i = 0; i < ARRAY_SIZE(locomo_devices); i++)
+		locomo_init_one_child(lchip, &locomo_devices[i]);
+	return 0;
+
+ out:
+	kfree(lchip);
+	return ret;
+}
+
+static int locomo_remove_child(struct device *dev, void *data)
+{
+	device_unregister(dev);
+	return 0;
+} 
+
+static void __locomo_remove(struct locomo *lchip)
+{
+	device_for_each_child(lchip->dev, NULL, locomo_remove_child);
+
+	if (lchip->irq != NO_IRQ) {
+		irq_set_chained_handler(lchip->irq, NULL);
+		irq_set_handler_data(lchip->irq, NULL);
+	}
+
+	iounmap(lchip->base);
+	kfree(lchip);
+}
+
+static int locomo_probe(struct platform_device *dev)
+{
+	struct resource *mem;
+	int irq;
+
+	mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
+	if (!mem)
+		return -EINVAL;
+	irq = platform_get_irq(dev, 0);
+	if (irq < 0)
+		return -ENXIO;
+
+	return __locomo_probe(&dev->dev, mem, irq);
+}
+
+static int locomo_remove(struct platform_device *dev)
+{
+	struct locomo *lchip = platform_get_drvdata(dev);
+
+	if (lchip) {
+		__locomo_remove(lchip);
+		platform_set_drvdata(dev, NULL);
+	}
+
+	return 0;
+}
+
+/*
+ *	Not sure if this should be on the system bus or not yet.
+ *	We really want some way to register a system device at
+ *	the per-machine level, and then have this driver pick
+ *	up the registered devices.
+ */
+static struct platform_driver locomo_device_driver = {
+	.probe		= locomo_probe,
+	.remove		= locomo_remove,
+#ifdef CONFIG_PM
+	.suspend	= locomo_suspend,
+	.resume		= locomo_resume,
+#endif
+	.driver		= {
+		.name	= "locomo",
+	},
+};
+
+/*
+ *	Get the parent device driver (us) structure
+ *	from a child function device
+ */
+static inline struct locomo *locomo_chip_driver(struct locomo_dev *ldev)
+{
+	return (struct locomo *)dev_get_drvdata(ldev->dev.parent);
+}
+
+void locomo_gpio_set_dir(struct device *dev, unsigned int bits, unsigned int dir)
+{
+	struct locomo *lchip = dev_get_drvdata(dev);
+	unsigned long flags;
+	unsigned int r;
+
+	if (!lchip)
+		return;
+
+	spin_lock_irqsave(&lchip->lock, flags);
+
+	r = locomo_readl(lchip->base + LOCOMO_GPD);
+	if (dir)
+		r |= bits;
+	else
+		r &= ~bits;
+	locomo_writel(r, lchip->base + LOCOMO_GPD);
+
+	r = locomo_readl(lchip->base + LOCOMO_GPE);
+	if (dir)
+		r |= bits;
+	else
+		r &= ~bits;
+	locomo_writel(r, lchip->base + LOCOMO_GPE);
+
+	spin_unlock_irqrestore(&lchip->lock, flags);
+}
+EXPORT_SYMBOL(locomo_gpio_set_dir);
+
+int locomo_gpio_read_level(struct device *dev, unsigned int bits)
+{
+	struct locomo *lchip = dev_get_drvdata(dev);
+	unsigned long flags;
+	unsigned int ret;
+
+	if (!lchip)
+		return -ENODEV;
+
+	spin_lock_irqsave(&lchip->lock, flags);
+	ret = locomo_readl(lchip->base + LOCOMO_GPL);
+	spin_unlock_irqrestore(&lchip->lock, flags);
+
+	ret &= bits;
+	return ret;
+}
+EXPORT_SYMBOL(locomo_gpio_read_level);
+
+int locomo_gpio_read_output(struct device *dev, unsigned int bits)
+{
+	struct locomo *lchip = dev_get_drvdata(dev);
+	unsigned long flags;
+	unsigned int ret;
+
+	if (!lchip)
+		return -ENODEV;
+
+	spin_lock_irqsave(&lchip->lock, flags);
+	ret = locomo_readl(lchip->base + LOCOMO_GPO);
+	spin_unlock_irqrestore(&lchip->lock, flags);
+
+	ret &= bits;
+	return ret;
+}
+EXPORT_SYMBOL(locomo_gpio_read_output);
+
+void locomo_gpio_write(struct device *dev, unsigned int bits, unsigned int set)
+{
+	struct locomo *lchip = dev_get_drvdata(dev);
+	unsigned long flags;
+	unsigned int r;
+
+	if (!lchip)
+		return;
+
+	spin_lock_irqsave(&lchip->lock, flags);
+
+	r = locomo_readl(lchip->base + LOCOMO_GPO);
+	if (set)
+		r |= bits;
+	else
+		r &= ~bits;
+	locomo_writel(r, lchip->base + LOCOMO_GPO);
+
+	spin_unlock_irqrestore(&lchip->lock, flags);
+}
+EXPORT_SYMBOL(locomo_gpio_write);
+
+static void locomo_m62332_sendbit(void *mapbase, int bit)
+{
+	unsigned int r;
+
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r &=  ~(LOCOMO_DAC_SCLOEB);
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
+	udelay(DAC_DATA_HOLD_TIME);	/* 300 nsec */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r &=  ~(LOCOMO_DAC_SCLOEB);
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
+	udelay(DAC_SCL_LOW_HOLD_TIME);	/* 4.7 usec */
+
+	if (bit & 1) {
+		r = locomo_readl(mapbase + LOCOMO_DAC);
+		r |=  LOCOMO_DAC_SDAOEB;
+		locomo_writel(r, mapbase + LOCOMO_DAC);
+		udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
+	} else {
+		r = locomo_readl(mapbase + LOCOMO_DAC);
+		r &=  ~(LOCOMO_DAC_SDAOEB);
+		locomo_writel(r, mapbase + LOCOMO_DAC);
+		udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
+	}
+
+	udelay(DAC_DATA_SETUP_TIME);	/* 250 nsec */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r |=  LOCOMO_DAC_SCLOEB;
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
+	udelay(DAC_SCL_HIGH_HOLD_TIME);	/*  4.0 usec */
+}
+
+void locomo_m62332_senddata(struct locomo_dev *ldev, unsigned int dac_data, int channel)
+{
+	struct locomo *lchip = locomo_chip_driver(ldev);
+	int i;
+	unsigned char data;
+	unsigned int r;
+	void *mapbase = lchip->base;
+	unsigned long flags;
+
+	spin_lock_irqsave(&lchip->lock, flags);
+
+	/* Start */
+	udelay(DAC_BUS_FREE_TIME);	/* 5.0 usec */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r |=  LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
+	udelay(DAC_SCL_HIGH_HOLD_TIME);	/* 4.0 usec */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r &=  ~(LOCOMO_DAC_SDAOEB);
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_START_HOLD_TIME);	/* 5.0 usec */
+	udelay(DAC_DATA_HOLD_TIME);	/* 300 nsec */
+
+	/* Send slave address and W bit (LSB is W bit) */
+	data = (M62332_SLAVE_ADDR << 1) | M62332_W_BIT;
+	for (i = 1; i <= 8; i++) {
+		locomo_m62332_sendbit(mapbase, data >> (8 - i));
+	}
+
+	/* Check A bit */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r &=  ~(LOCOMO_DAC_SCLOEB);
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
+	udelay(DAC_SCL_LOW_HOLD_TIME);	/* 4.7 usec */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r &=  ~(LOCOMO_DAC_SDAOEB);
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r |=  LOCOMO_DAC_SCLOEB;
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
+	udelay(DAC_SCL_HIGH_HOLD_TIME);	/* 4.7 usec */
+	if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) {	/* High is error */
+		printk(KERN_WARNING "locomo: m62332_senddata Error 1\n");
+		goto out;
+	}
+
+	/* Send Sub address (LSB is channel select) */
+	/*    channel = 0 : ch1 select              */
+	/*            = 1 : ch2 select              */
+	data = M62332_SUB_ADDR + channel;
+	for (i = 1; i <= 8; i++) {
+		locomo_m62332_sendbit(mapbase, data >> (8 - i));
+	}
+
+	/* Check A bit */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r &=  ~(LOCOMO_DAC_SCLOEB);
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
+	udelay(DAC_SCL_LOW_HOLD_TIME);	/* 4.7 usec */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r &=  ~(LOCOMO_DAC_SDAOEB);
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r |=  LOCOMO_DAC_SCLOEB;
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
+	udelay(DAC_SCL_HIGH_HOLD_TIME);	/* 4.7 usec */
+	if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) {	/* High is error */
+		printk(KERN_WARNING "locomo: m62332_senddata Error 2\n");
+		goto out;
+	}
+
+	/* Send DAC data */
+	for (i = 1; i <= 8; i++) {
+		locomo_m62332_sendbit(mapbase, dac_data >> (8 - i));
+	}
+
+	/* Check A bit */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r &=  ~(LOCOMO_DAC_SCLOEB);
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
+	udelay(DAC_SCL_LOW_HOLD_TIME);	/* 4.7 usec */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r &=  ~(LOCOMO_DAC_SDAOEB);
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r |=  LOCOMO_DAC_SCLOEB;
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
+	udelay(DAC_SCL_HIGH_HOLD_TIME);	/* 4.7 usec */
+	if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) {	/* High is error */
+		printk(KERN_WARNING "locomo: m62332_senddata Error 3\n");
+	}
+
+out:
+	/* stop */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r &=  ~(LOCOMO_DAC_SCLOEB);
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
+	udelay(DAC_SCL_LOW_HOLD_TIME);	/* 4.7 usec */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r |=  LOCOMO_DAC_SCLOEB;
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
+	udelay(DAC_SCL_HIGH_HOLD_TIME);	/* 4 usec */
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r |=  LOCOMO_DAC_SDAOEB;
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
+	udelay(DAC_SCL_HIGH_HOLD_TIME);	/* 4 usec */
+
+	r = locomo_readl(mapbase + LOCOMO_DAC);
+	r |=  LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
+	locomo_writel(r, mapbase + LOCOMO_DAC);
+	udelay(DAC_LOW_SETUP_TIME);	/* 1000 nsec */
+	udelay(DAC_SCL_LOW_HOLD_TIME);	/* 4.7 usec */
+
+	spin_unlock_irqrestore(&lchip->lock, flags);
+}
+EXPORT_SYMBOL(locomo_m62332_senddata);
+
+/*
+ *	Frontlight control
+ */
+
+void locomo_frontlight_set(struct locomo_dev *dev, int duty, int vr, int bpwf)
+{
+	unsigned long flags;
+	struct locomo *lchip = locomo_chip_driver(dev);
+
+	if (vr)
+		locomo_gpio_write(dev->dev.parent, LOCOMO_GPIO_FL_VR, 1);
+	else
+		locomo_gpio_write(dev->dev.parent, LOCOMO_GPIO_FL_VR, 0);
+
+	spin_lock_irqsave(&lchip->lock, flags);
+	locomo_writel(bpwf, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
+	udelay(100);
+	locomo_writel(duty, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALD);
+	locomo_writel(bpwf | LOCOMO_ALC_EN, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
+	spin_unlock_irqrestore(&lchip->lock, flags);
+}
+EXPORT_SYMBOL(locomo_frontlight_set);
+
+/*
+ *	LoCoMo "Register Access Bus."
+ *
+ *	We model this as a regular bus type, and hang devices directly
+ *	off this.
+ */
+static int locomo_match(struct device *_dev, struct device_driver *_drv)
+{
+	struct locomo_dev *dev = LOCOMO_DEV(_dev);
+	struct locomo_driver *drv = LOCOMO_DRV(_drv);
+
+	return dev->devid == drv->devid;
+}
+
+static int locomo_bus_suspend(struct device *dev, pm_message_t state)
+{
+	struct locomo_dev *ldev = LOCOMO_DEV(dev);
+	struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
+	int ret = 0;
+
+	if (drv && drv->suspend)
+		ret = drv->suspend(ldev, state);
+	return ret;
+}
+
+static int locomo_bus_resume(struct device *dev)
+{
+	struct locomo_dev *ldev = LOCOMO_DEV(dev);
+	struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
+	int ret = 0;
+
+	if (drv && drv->resume)
+		ret = drv->resume(ldev);
+	return ret;
+}
+
+static int locomo_bus_probe(struct device *dev)
+{
+	struct locomo_dev *ldev = LOCOMO_DEV(dev);
+	struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
+	int ret = -ENODEV;
+
+	if (drv->probe)
+		ret = drv->probe(ldev);
+	return ret;
+}
+
+static int locomo_bus_remove(struct device *dev)
+{
+	struct locomo_dev *ldev = LOCOMO_DEV(dev);
+	struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
+	int ret = 0;
+
+	if (drv->remove)
+		ret = drv->remove(ldev);
+	return ret;
+}
+
+struct bus_type locomo_bus_type = {
+	.name		= "locomo-bus",
+	.match		= locomo_match,
+	.probe		= locomo_bus_probe,
+	.remove		= locomo_bus_remove,
+	.suspend	= locomo_bus_suspend,
+	.resume		= locomo_bus_resume,
+};
+
+int locomo_driver_register(struct locomo_driver *driver)
+{
+	driver->drv.bus = &locomo_bus_type;
+	return driver_register(&driver->drv);
+}
+EXPORT_SYMBOL(locomo_driver_register);
+
+void locomo_driver_unregister(struct locomo_driver *driver)
+{
+	driver_unregister(&driver->drv);
+}
+EXPORT_SYMBOL(locomo_driver_unregister);
+
+static int __init locomo_init(void)
+{
+	int ret = bus_register(&locomo_bus_type);
+	if (ret == 0)
+		platform_driver_register(&locomo_device_driver);
+	return ret;
+}
+
+static void __exit locomo_exit(void)
+{
+	platform_driver_unregister(&locomo_device_driver);
+	bus_unregister(&locomo_bus_type);
+}
+
+module_init(locomo_init);
+module_exit(locomo_exit);
+
+MODULE_DESCRIPTION("Sharp LoCoMo core driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>");
diff --git a/kernel/arch/arm/common/mcpm_entry.c b/kernel/arch/arm/common/mcpm_entry.c
new file mode 100644
index 000000000..5f8a52ac7
--- /dev/null
+++ b/kernel/arch/arm/common/mcpm_entry.c
@@ -0,0 +1,486 @@
+/*
+ * arch/arm/common/mcpm_entry.c -- entry point for multi-cluster PM
+ *
+ * Created by:  Nicolas Pitre, March 2012
+ * Copyright:   (C) 2012-2013  Linaro Limited
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/irqflags.h>
+#include <linux/cpu_pm.h>
+
+#include <asm/mcpm.h>
+#include <asm/cacheflush.h>
+#include <asm/idmap.h>
+#include <asm/cputype.h>
+#include <asm/suspend.h>
+
+extern unsigned long mcpm_entry_vectors[MAX_NR_CLUSTERS][MAX_CPUS_PER_CLUSTER];
+
+void mcpm_set_entry_vector(unsigned cpu, unsigned cluster, void *ptr)
+{
+	unsigned long val = ptr ? virt_to_phys(ptr) : 0;
+	mcpm_entry_vectors[cluster][cpu] = val;
+	sync_cache_w(&mcpm_entry_vectors[cluster][cpu]);
+}
+
+extern unsigned long mcpm_entry_early_pokes[MAX_NR_CLUSTERS][MAX_CPUS_PER_CLUSTER][2];
+
+void mcpm_set_early_poke(unsigned cpu, unsigned cluster,
+			 unsigned long poke_phys_addr, unsigned long poke_val)
+{
+	unsigned long *poke = &mcpm_entry_early_pokes[cluster][cpu][0];
+	poke[0] = poke_phys_addr;
+	poke[1] = poke_val;
+	__sync_cache_range_w(poke, 2 * sizeof(*poke));
+}
+
+static const struct mcpm_platform_ops *platform_ops;
+
+int __init mcpm_platform_register(const struct mcpm_platform_ops *ops)
+{
+	if (platform_ops)
+		return -EBUSY;
+	platform_ops = ops;
+	return 0;
+}
+
+bool mcpm_is_available(void)
+{
+	return (platform_ops) ? true : false;
+}
+
+/*
+ * We can't use regular spinlocks. In the switcher case, it is possible
+ * for an outbound CPU to call power_down() after its inbound counterpart
+ * is already live using the same logical CPU number which trips lockdep
+ * debugging.
+ */
+static arch_spinlock_t mcpm_lock = __ARCH_SPIN_LOCK_UNLOCKED;
+
+static int mcpm_cpu_use_count[MAX_NR_CLUSTERS][MAX_CPUS_PER_CLUSTER];
+
+static inline bool mcpm_cluster_unused(unsigned int cluster)
+{
+	int i, cnt;
+	for (i = 0, cnt = 0; i < MAX_CPUS_PER_CLUSTER; i++)
+		cnt |= mcpm_cpu_use_count[cluster][i];
+	return !cnt;
+}
+
+int mcpm_cpu_power_up(unsigned int cpu, unsigned int cluster)
+{
+	bool cpu_is_down, cluster_is_down;
+	int ret = 0;
+
+	if (!platform_ops)
+		return -EUNATCH; /* try not to shadow power_up errors */
+	might_sleep();
+
+	/* backward compatibility callback */
+	if (platform_ops->power_up)
+		return platform_ops->power_up(cpu, cluster);
+
+	pr_debug("%s: cpu %u cluster %u\n", __func__, cpu, cluster);
+
+	/*
+	 * Since this is called with IRQs enabled, and no arch_spin_lock_irq
+	 * variant exists, we need to disable IRQs manually here.
+	 */
+	local_irq_disable();
+	arch_spin_lock(&mcpm_lock);
+
+	cpu_is_down = !mcpm_cpu_use_count[cluster][cpu];
+	cluster_is_down = mcpm_cluster_unused(cluster);
+
+	mcpm_cpu_use_count[cluster][cpu]++;
+	/*
+	 * The only possible values are:
+	 * 0 = CPU down
+	 * 1 = CPU (still) up
+	 * 2 = CPU requested to be up before it had a chance
+	 *     to actually make itself down.
+	 * Any other value is a bug.
+	 */
+	BUG_ON(mcpm_cpu_use_count[cluster][cpu] != 1 &&
+	       mcpm_cpu_use_count[cluster][cpu] != 2);
+
+	if (cluster_is_down)
+		ret = platform_ops->cluster_powerup(cluster);
+	if (cpu_is_down && !ret)
+		ret = platform_ops->cpu_powerup(cpu, cluster);
+
+	arch_spin_unlock(&mcpm_lock);
+	local_irq_enable();
+	return ret;
+}
+
+typedef void (*phys_reset_t)(unsigned long);
+
+void mcpm_cpu_power_down(void)
+{
+	unsigned int mpidr, cpu, cluster;
+	bool cpu_going_down, last_man;
+	phys_reset_t phys_reset;
+
+	if (WARN_ON_ONCE(!platform_ops))
+	       return;
+	BUG_ON(!irqs_disabled());
+
+	/*
+	 * Do this before calling into the power_down method,
+	 * as it might not always be safe to do afterwards.
+	 */
+	setup_mm_for_reboot();
+
+	/* backward compatibility callback */
+	if (platform_ops->power_down) {
+		platform_ops->power_down();
+		goto not_dead;
+	}
+
+	mpidr = read_cpuid_mpidr();
+	cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
+	cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
+	pr_debug("%s: cpu %u cluster %u\n", __func__, cpu, cluster);
+
+	__mcpm_cpu_going_down(cpu, cluster);
+
+	arch_spin_lock(&mcpm_lock);
+	BUG_ON(__mcpm_cluster_state(cluster) != CLUSTER_UP);
+
+	mcpm_cpu_use_count[cluster][cpu]--;
+	BUG_ON(mcpm_cpu_use_count[cluster][cpu] != 0 &&
+	       mcpm_cpu_use_count[cluster][cpu] != 1);
+	cpu_going_down = !mcpm_cpu_use_count[cluster][cpu];
+	last_man = mcpm_cluster_unused(cluster);
+
+	if (last_man && __mcpm_outbound_enter_critical(cpu, cluster)) {
+		platform_ops->cpu_powerdown_prepare(cpu, cluster);
+		platform_ops->cluster_powerdown_prepare(cluster);
+		arch_spin_unlock(&mcpm_lock);
+		platform_ops->cluster_cache_disable();
+		__mcpm_outbound_leave_critical(cluster, CLUSTER_DOWN);
+	} else {
+		if (cpu_going_down)
+			platform_ops->cpu_powerdown_prepare(cpu, cluster);
+		arch_spin_unlock(&mcpm_lock);
+		/*
+		 * If cpu_going_down is false here, that means a power_up
+		 * request raced ahead of us.  Even if we do not want to
+		 * shut this CPU down, the caller still expects execution
+		 * to return through the system resume entry path, like
+		 * when the WFI is aborted due to a new IRQ or the like..
+		 * So let's continue with cache cleaning in all cases.
+		 */
+		platform_ops->cpu_cache_disable();
+	}
+
+	__mcpm_cpu_down(cpu, cluster);
+
+	/* Now we are prepared for power-down, do it: */
+	if (cpu_going_down)
+		wfi();
+
+not_dead:
+	/*
+	 * It is possible for a power_up request to happen concurrently
+	 * with a power_down request for the same CPU. In this case the
+	 * CPU might not be able to actually enter a powered down state
+	 * with the WFI instruction if the power_up request has removed
+	 * the required reset condition.  We must perform a re-entry in
+	 * the kernel as if the power_up method just had deasserted reset
+	 * on the CPU.
+	 */
+	phys_reset = (phys_reset_t)(unsigned long)virt_to_phys(cpu_reset);
+	phys_reset(virt_to_phys(mcpm_entry_point));
+
+	/* should never get here */
+	BUG();
+}
+
+int mcpm_wait_for_cpu_powerdown(unsigned int cpu, unsigned int cluster)
+{
+	int ret;
+
+	if (WARN_ON_ONCE(!platform_ops || !platform_ops->wait_for_powerdown))
+		return -EUNATCH;
+
+	ret = platform_ops->wait_for_powerdown(cpu, cluster);
+	if (ret)
+		pr_warn("%s: cpu %u, cluster %u failed to power down (%d)\n",
+			__func__, cpu, cluster, ret);
+
+	return ret;
+}
+
+void mcpm_cpu_suspend(u64 expected_residency)
+{
+	if (WARN_ON_ONCE(!platform_ops))
+		return;
+
+	/* backward compatibility callback */
+	if (platform_ops->suspend) {
+		phys_reset_t phys_reset;
+		BUG_ON(!irqs_disabled());
+		setup_mm_for_reboot();
+		platform_ops->suspend(expected_residency);
+		phys_reset = (phys_reset_t)(unsigned long)virt_to_phys(cpu_reset);
+		phys_reset(virt_to_phys(mcpm_entry_point));
+		BUG();
+	}
+
+	/* Some platforms might have to enable special resume modes, etc. */
+	if (platform_ops->cpu_suspend_prepare) {
+		unsigned int mpidr = read_cpuid_mpidr();
+		unsigned int cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
+		unsigned int cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1); 
+		arch_spin_lock(&mcpm_lock);
+		platform_ops->cpu_suspend_prepare(cpu, cluster);
+		arch_spin_unlock(&mcpm_lock);
+	}
+	mcpm_cpu_power_down();
+}
+
+int mcpm_cpu_powered_up(void)
+{
+	unsigned int mpidr, cpu, cluster;
+	bool cpu_was_down, first_man;
+	unsigned long flags;
+
+	if (!platform_ops)
+		return -EUNATCH;
+
+	/* backward compatibility callback */
+	if (platform_ops->powered_up) {
+		platform_ops->powered_up();
+		return 0;
+	}
+
+	mpidr = read_cpuid_mpidr();
+	cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
+	cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
+	local_irq_save(flags);
+	arch_spin_lock(&mcpm_lock);
+
+	cpu_was_down = !mcpm_cpu_use_count[cluster][cpu];
+	first_man = mcpm_cluster_unused(cluster);
+
+	if (first_man && platform_ops->cluster_is_up)
+		platform_ops->cluster_is_up(cluster);
+	if (cpu_was_down)
+		mcpm_cpu_use_count[cluster][cpu] = 1;
+	if (platform_ops->cpu_is_up)
+		platform_ops->cpu_is_up(cpu, cluster);
+
+	arch_spin_unlock(&mcpm_lock);
+	local_irq_restore(flags);
+
+	return 0;
+}
+
+#ifdef CONFIG_ARM_CPU_SUSPEND
+
+static int __init nocache_trampoline(unsigned long _arg)
+{
+	void (*cache_disable)(void) = (void *)_arg;
+	unsigned int mpidr = read_cpuid_mpidr();
+	unsigned int cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
+	unsigned int cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
+	phys_reset_t phys_reset;
+
+	mcpm_set_entry_vector(cpu, cluster, cpu_resume);
+	setup_mm_for_reboot();
+
+	__mcpm_cpu_going_down(cpu, cluster);
+	BUG_ON(!__mcpm_outbound_enter_critical(cpu, cluster));
+	cache_disable();
+	__mcpm_outbound_leave_critical(cluster, CLUSTER_DOWN);
+	__mcpm_cpu_down(cpu, cluster);
+
+	phys_reset = (phys_reset_t)(unsigned long)virt_to_phys(cpu_reset);
+	phys_reset(virt_to_phys(mcpm_entry_point));
+	BUG();
+}
+
+int __init mcpm_loopback(void (*cache_disable)(void))
+{
+	int ret;
+
+	/*
+	 * We're going to soft-restart the current CPU through the
+	 * low-level MCPM code by leveraging the suspend/resume
+	 * infrastructure. Let's play it safe by using cpu_pm_enter()
+	 * in case the CPU init code path resets the VFP or similar.
+	 */
+	local_irq_disable();
+	local_fiq_disable();
+	ret = cpu_pm_enter();
+	if (!ret) {
+		ret = cpu_suspend((unsigned long)cache_disable, nocache_trampoline);
+		cpu_pm_exit();
+	}
+	local_fiq_enable();
+	local_irq_enable();
+	if (ret)
+		pr_err("%s returned %d\n", __func__, ret);
+	return ret;
+}
+
+#endif
+
+struct sync_struct mcpm_sync;
+
+/*
+ * __mcpm_cpu_going_down: Indicates that the cpu is being torn down.
+ *    This must be called at the point of committing to teardown of a CPU.
+ *    The CPU cache (SCTRL.C bit) is expected to still be active.
+ */
+void __mcpm_cpu_going_down(unsigned int cpu, unsigned int cluster)
+{
+	mcpm_sync.clusters[cluster].cpus[cpu].cpu = CPU_GOING_DOWN;
+	sync_cache_w(&mcpm_sync.clusters[cluster].cpus[cpu].cpu);
+}
+
+/*
+ * __mcpm_cpu_down: Indicates that cpu teardown is complete and that the
+ *    cluster can be torn down without disrupting this CPU.
+ *    To avoid deadlocks, this must be called before a CPU is powered down.
+ *    The CPU cache (SCTRL.C bit) is expected to be off.
+ *    However L2 cache might or might not be active.
+ */
+void __mcpm_cpu_down(unsigned int cpu, unsigned int cluster)
+{
+	dmb();
+	mcpm_sync.clusters[cluster].cpus[cpu].cpu = CPU_DOWN;
+	sync_cache_w(&mcpm_sync.clusters[cluster].cpus[cpu].cpu);
+	sev();
+}
+
+/*
+ * __mcpm_outbound_leave_critical: Leave the cluster teardown critical section.
+ * @state: the final state of the cluster:
+ *     CLUSTER_UP: no destructive teardown was done and the cluster has been
+ *         restored to the previous state (CPU cache still active); or
+ *     CLUSTER_DOWN: the cluster has been torn-down, ready for power-off
+ *         (CPU cache disabled, L2 cache either enabled or disabled).
+ */
+void __mcpm_outbound_leave_critical(unsigned int cluster, int state)
+{
+	dmb();
+	mcpm_sync.clusters[cluster].cluster = state;
+	sync_cache_w(&mcpm_sync.clusters[cluster].cluster);
+	sev();
+}
+
+/*
+ * __mcpm_outbound_enter_critical: Enter the cluster teardown critical section.
+ * This function should be called by the last man, after local CPU teardown
+ * is complete.  CPU cache expected to be active.
+ *
+ * Returns:
+ *     false: the critical section was not entered because an inbound CPU was
+ *         observed, or the cluster is already being set up;
+ *     true: the critical section was entered: it is now safe to tear down the
+ *         cluster.
+ */
+bool __mcpm_outbound_enter_critical(unsigned int cpu, unsigned int cluster)
+{
+	unsigned int i;
+	struct mcpm_sync_struct *c = &mcpm_sync.clusters[cluster];
+
+	/* Warn inbound CPUs that the cluster is being torn down: */
+	c->cluster = CLUSTER_GOING_DOWN;
+	sync_cache_w(&c->cluster);
+
+	/* Back out if the inbound cluster is already in the critical region: */
+	sync_cache_r(&c->inbound);
+	if (c->inbound == INBOUND_COMING_UP)
+		goto abort;
+
+	/*
+	 * Wait for all CPUs to get out of the GOING_DOWN state, so that local
+	 * teardown is complete on each CPU before tearing down the cluster.
+	 *
+	 * If any CPU has been woken up again from the DOWN state, then we
+	 * shouldn't be taking the cluster down at all: abort in that case.
+	 */
+	sync_cache_r(&c->cpus);
+	for (i = 0; i < MAX_CPUS_PER_CLUSTER; i++) {
+		int cpustate;
+
+		if (i == cpu)
+			continue;
+
+		while (1) {
+			cpustate = c->cpus[i].cpu;
+			if (cpustate != CPU_GOING_DOWN)
+				break;
+
+			wfe();
+			sync_cache_r(&c->cpus[i].cpu);
+		}
+
+		switch (cpustate) {
+		case CPU_DOWN:
+			continue;
+
+		default:
+			goto abort;
+		}
+	}
+
+	return true;
+
+abort:
+	__mcpm_outbound_leave_critical(cluster, CLUSTER_UP);
+	return false;
+}
+
+int __mcpm_cluster_state(unsigned int cluster)
+{
+	sync_cache_r(&mcpm_sync.clusters[cluster].cluster);
+	return mcpm_sync.clusters[cluster].cluster;
+}
+
+extern unsigned long mcpm_power_up_setup_phys;
+
+int __init mcpm_sync_init(
+	void (*power_up_setup)(unsigned int affinity_level))
+{
+	unsigned int i, j, mpidr, this_cluster;
+
+	BUILD_BUG_ON(MCPM_SYNC_CLUSTER_SIZE * MAX_NR_CLUSTERS != sizeof mcpm_sync);
+	BUG_ON((unsigned long)&mcpm_sync & (__CACHE_WRITEBACK_GRANULE - 1));
+
+	/*
+	 * Set initial CPU and cluster states.
+	 * Only one cluster is assumed to be active at this point.
+	 */
+	for (i = 0; i < MAX_NR_CLUSTERS; i++) {
+		mcpm_sync.clusters[i].cluster = CLUSTER_DOWN;
+		mcpm_sync.clusters[i].inbound = INBOUND_NOT_COMING_UP;
+		for (j = 0; j < MAX_CPUS_PER_CLUSTER; j++)
+			mcpm_sync.clusters[i].cpus[j].cpu = CPU_DOWN;
+	}
+	mpidr = read_cpuid_mpidr();
+	this_cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
+	for_each_online_cpu(i) {
+		mcpm_cpu_use_count[this_cluster][i] = 1;
+		mcpm_sync.clusters[this_cluster].cpus[i].cpu = CPU_UP;
+	}
+	mcpm_sync.clusters[this_cluster].cluster = CLUSTER_UP;
+	sync_cache_w(&mcpm_sync);
+
+	if (power_up_setup) {
+		mcpm_power_up_setup_phys = virt_to_phys(power_up_setup);
+		sync_cache_w(&mcpm_power_up_setup_phys);
+	}
+
+	return 0;
+}
diff --git a/kernel/arch/arm/common/mcpm_head.S b/kernel/arch/arm/common/mcpm_head.S
new file mode 100644
index 000000000..e02db4b81
--- /dev/null
+++ b/kernel/arch/arm/common/mcpm_head.S
@@ -0,0 +1,233 @@
+/*
+ * arch/arm/common/mcpm_head.S -- kernel entry point for multi-cluster PM
+ *
+ * Created by:  Nicolas Pitre, March 2012
+ * Copyright:   (C) 2012-2013  Linaro Limited
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ *
+ * Refer to Documentation/arm/cluster-pm-race-avoidance.txt
+ * for details of the synchronisation algorithms used here.
+ */
+
+#include <linux/linkage.h>
+#include <asm/mcpm.h>
+#include <asm/assembler.h>
+
+#include "vlock.h"
+
+.if MCPM_SYNC_CLUSTER_CPUS
+.error "cpus must be the first member of struct mcpm_sync_struct"
+.endif
+
+	.macro	pr_dbg	string
+#if defined(CONFIG_DEBUG_LL) && defined(DEBUG)
+	b	1901f
+1902:	.asciz	"CPU"
+1903:	.asciz	" cluster"
+1904:	.asciz	": \string"
+	.align
+1901:	adr	r0, 1902b
+	bl	printascii
+	mov	r0, r9
+	bl	printhex2
+	adr	r0, 1903b
+	bl	printascii
+	mov	r0, r10
+	bl	printhex2
+	adr	r0, 1904b
+	bl	printascii
+#endif
+	.endm
+
+	.arm
+	.align
+
+ENTRY(mcpm_entry_point)
+
+ ARM_BE8(setend        be)
+ THUMB(	adr	r12, BSYM(1f)	)
+ THUMB(	bx	r12		)
+ THUMB(	.thumb			)
+1:
+	mrc	p15, 0, r0, c0, c0, 5		@ MPIDR
+	ubfx	r9, r0, #0, #8			@ r9 = cpu
+	ubfx	r10, r0, #8, #8			@ r10 = cluster
+	mov	r3, #MAX_CPUS_PER_CLUSTER
+	mla	r4, r3, r10, r9			@ r4 = canonical CPU index
+	cmp	r4, #(MAX_CPUS_PER_CLUSTER * MAX_NR_CLUSTERS)
+	blo	2f
+
+	/* We didn't expect this CPU.  Try to cheaply make it quiet. */
+1:	wfi
+	wfe
+	b	1b
+
+2:	pr_dbg	"kernel mcpm_entry_point\n"
+
+	/*
+	 * MMU is off so we need to get to various variables in a
+	 * position independent way.
+	 */
+	adr	r5, 3f
+	ldmia	r5, {r0, r6, r7, r8, r11}
+	add	r0, r5, r0			@ r0 = mcpm_entry_early_pokes
+	add	r6, r5, r6			@ r6 = mcpm_entry_vectors
+	ldr	r7, [r5, r7]			@ r7 = mcpm_power_up_setup_phys
+	add	r8, r5, r8			@ r8 = mcpm_sync
+	add	r11, r5, r11			@ r11 = first_man_locks
+
+	@ Perform an early poke, if any
+	add	r0, r0, r4, lsl #3
+	ldmia	r0, {r0, r1}
+	teq	r0, #0
+	strne	r1, [r0]
+
+	mov	r0, #MCPM_SYNC_CLUSTER_SIZE
+	mla	r8, r0, r10, r8			@ r8 = sync cluster base
+
+	@ Signal that this CPU is coming UP:
+	mov	r0, #CPU_COMING_UP
+	mov	r5, #MCPM_SYNC_CPU_SIZE
+	mla	r5, r9, r5, r8			@ r5 = sync cpu address
+	strb	r0, [r5]
+
+	@ At this point, the cluster cannot unexpectedly enter the GOING_DOWN
+	@ state, because there is at least one active CPU (this CPU).
+
+	mov	r0, #VLOCK_SIZE
+	mla	r11, r0, r10, r11		@ r11 = cluster first man lock
+	mov	r0, r11
+	mov	r1, r9				@ cpu
+	bl	vlock_trylock			@ implies DMB
+
+	cmp	r0, #0				@ failed to get the lock?
+	bne	mcpm_setup_wait		@ wait for cluster setup if so
+
+	ldrb	r0, [r8, #MCPM_SYNC_CLUSTER_CLUSTER]
+	cmp	r0, #CLUSTER_UP			@ cluster already up?
+	bne	mcpm_setup			@ if not, set up the cluster
+
+	@ Otherwise, release the first man lock and skip setup:
+	mov	r0, r11
+	bl	vlock_unlock
+	b	mcpm_setup_complete
+
+mcpm_setup:
+	@ Control dependency implies strb not observable before previous ldrb.
+
+	@ Signal that the cluster is being brought up:
+	mov	r0, #INBOUND_COMING_UP
+	strb	r0, [r8, #MCPM_SYNC_CLUSTER_INBOUND]
+	dmb
+
+	@ Any CPU trying to take the cluster into CLUSTER_GOING_DOWN from this
+	@ point onwards will observe INBOUND_COMING_UP and abort.
+
+	@ Wait for any previously-pending cluster teardown operations to abort
+	@ or complete:
+mcpm_teardown_wait:
+	ldrb	r0, [r8, #MCPM_SYNC_CLUSTER_CLUSTER]
+	cmp	r0, #CLUSTER_GOING_DOWN
+	bne	first_man_setup
+	wfe
+	b	mcpm_teardown_wait
+
+first_man_setup:
+	dmb
+
+	@ If the outbound gave up before teardown started, skip cluster setup:
+
+	cmp	r0, #CLUSTER_UP
+	beq	mcpm_setup_leave
+
+	@ power_up_setup is now responsible for setting up the cluster:
+
+	cmp	r7, #0
+	mov	r0, #1		@ second (cluster) affinity level
+	blxne	r7		@ Call power_up_setup if defined
+	dmb
+
+	mov	r0, #CLUSTER_UP
+	strb	r0, [r8, #MCPM_SYNC_CLUSTER_CLUSTER]
+	dmb
+
+mcpm_setup_leave:
+	@ Leave the cluster setup critical section:
+
+	mov	r0, #INBOUND_NOT_COMING_UP
+	strb	r0, [r8, #MCPM_SYNC_CLUSTER_INBOUND]
+	dsb	st
+	sev
+
+	mov	r0, r11
+	bl	vlock_unlock	@ implies DMB
+	b	mcpm_setup_complete
+
+	@ In the contended case, non-first men wait here for cluster setup
+	@ to complete:
+mcpm_setup_wait:
+	ldrb	r0, [r8, #MCPM_SYNC_CLUSTER_CLUSTER]
+	cmp	r0, #CLUSTER_UP
+	wfene
+	bne	mcpm_setup_wait
+	dmb
+
+mcpm_setup_complete:
+	@ If a platform-specific CPU setup hook is needed, it is
+	@ called from here.
+
+	cmp	r7, #0
+	mov	r0, #0		@ first (CPU) affinity level
+	blxne	r7		@ Call power_up_setup if defined
+	dmb
+
+	@ Mark the CPU as up:
+
+	mov	r0, #CPU_UP
+	strb	r0, [r5]
+
+	@ Observability order of CPU_UP and opening of the gate does not matter.
+
+mcpm_entry_gated:
+	ldr	r5, [r6, r4, lsl #2]		@ r5 = CPU entry vector
+	cmp	r5, #0
+	wfeeq
+	beq	mcpm_entry_gated
+	dmb
+
+	pr_dbg	"released\n"
+	bx	r5
+
+	.align	2
+
+3:	.word	mcpm_entry_early_pokes - .
+	.word	mcpm_entry_vectors - 3b
+	.word	mcpm_power_up_setup_phys - 3b
+	.word	mcpm_sync - 3b
+	.word	first_man_locks - 3b
+
+ENDPROC(mcpm_entry_point)
+
+	.bss
+
+	.align	CACHE_WRITEBACK_ORDER
+	.type	first_man_locks, #object
+first_man_locks:
+	.space	VLOCK_SIZE * MAX_NR_CLUSTERS
+	.align	CACHE_WRITEBACK_ORDER
+
+	.type	mcpm_entry_vectors, #object
+ENTRY(mcpm_entry_vectors)
+	.space	4 * MAX_NR_CLUSTERS * MAX_CPUS_PER_CLUSTER
+
+	.type	mcpm_entry_early_pokes, #object
+ENTRY(mcpm_entry_early_pokes)
+	.space	8 * MAX_NR_CLUSTERS * MAX_CPUS_PER_CLUSTER
+
+	.type	mcpm_power_up_setup_phys, #object
+ENTRY(mcpm_power_up_setup_phys)
+	.space  4		@ set by mcpm_sync_init()
diff --git a/kernel/arch/arm/common/mcpm_platsmp.c b/kernel/arch/arm/common/mcpm_platsmp.c
new file mode 100644
index 000000000..92e54d7c6
--- /dev/null
+++ b/kernel/arch/arm/common/mcpm_platsmp.c
@@ -0,0 +1,103 @@
+/*
+ * linux/arch/arm/mach-vexpress/mcpm_platsmp.c
+ *
+ * Created by:  Nicolas Pitre, November 2012
+ * Copyright:   (C) 2012-2013  Linaro Limited
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Code to handle secondary CPU bringup and hotplug for the cluster power API.
+ */
+
+#include <linux/init.h>
+#include <linux/smp.h>
+#include <linux/spinlock.h>
+
+#include <asm/mcpm.h>
+#include <asm/smp.h>
+#include <asm/smp_plat.h>
+
+static void cpu_to_pcpu(unsigned int cpu,
+			unsigned int *pcpu, unsigned int *pcluster)
+{
+	unsigned int mpidr;
+
+	mpidr = cpu_logical_map(cpu);
+	*pcpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
+	*pcluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
+}
+
+static int mcpm_boot_secondary(unsigned int cpu, struct task_struct *idle)
+{
+	unsigned int pcpu, pcluster, ret;
+	extern void secondary_startup(void);
+
+	cpu_to_pcpu(cpu, &pcpu, &pcluster);
+
+	pr_debug("%s: logical CPU %d is physical CPU %d cluster %d\n",
+		 __func__, cpu, pcpu, pcluster);
+
+	mcpm_set_entry_vector(pcpu, pcluster, NULL);
+	ret = mcpm_cpu_power_up(pcpu, pcluster);
+	if (ret)
+		return ret;
+	mcpm_set_entry_vector(pcpu, pcluster, secondary_startup);
+	arch_send_wakeup_ipi_mask(cpumask_of(cpu));
+	dsb_sev();
+	return 0;
+}
+
+static void mcpm_secondary_init(unsigned int cpu)
+{
+	mcpm_cpu_powered_up();
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+
+static int mcpm_cpu_kill(unsigned int cpu)
+{
+	unsigned int pcpu, pcluster;
+
+	cpu_to_pcpu(cpu, &pcpu, &pcluster);
+
+	return !mcpm_wait_for_cpu_powerdown(pcpu, pcluster);
+}
+
+static int mcpm_cpu_disable(unsigned int cpu)
+{
+	/*
+	 * We assume all CPUs may be shut down.
+	 * This would be the hook to use for eventual Secure
+	 * OS migration requests as described in the PSCI spec.
+	 */
+	return 0;
+}
+
+static void mcpm_cpu_die(unsigned int cpu)
+{
+	unsigned int mpidr, pcpu, pcluster;
+	mpidr = read_cpuid_mpidr();
+	pcpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
+	pcluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
+	mcpm_set_entry_vector(pcpu, pcluster, NULL);
+	mcpm_cpu_power_down();
+}
+
+#endif
+
+static struct smp_operations __initdata mcpm_smp_ops = {
+	.smp_boot_secondary	= mcpm_boot_secondary,
+	.smp_secondary_init	= mcpm_secondary_init,
+#ifdef CONFIG_HOTPLUG_CPU
+	.cpu_kill		= mcpm_cpu_kill,
+	.cpu_disable		= mcpm_cpu_disable,
+	.cpu_die		= mcpm_cpu_die,
+#endif
+};
+
+void __init mcpm_smp_set_ops(void)
+{
+	smp_set_ops(&mcpm_smp_ops);
+}
diff --git a/kernel/arch/arm/common/sa1111.c b/kernel/arch/arm/common/sa1111.c
new file mode 100644
index 000000000..5cc779c8e
--- /dev/null
+++ b/kernel/arch/arm/common/sa1111.c
@@ -0,0 +1,1456 @@
+/*
+ * linux/arch/arm/common/sa1111.c
+ *
+ * SA1111 support
+ *
+ * Original code by John Dorsey
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This file contains all generic SA1111 support.
+ *
+ * All initialization functions provided here are intended to be called
+ * from machine specific code with proper arguments when required.
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/dma-mapping.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+
+#include <mach/hardware.h>
+#include <asm/mach/irq.h>
+#include <asm/mach-types.h>
+#include <asm/sizes.h>
+
+#include <asm/hardware/sa1111.h>
+
+/* SA1111 IRQs */
+#define IRQ_GPAIN0		(0)
+#define IRQ_GPAIN1		(1)
+#define IRQ_GPAIN2		(2)
+#define IRQ_GPAIN3		(3)
+#define IRQ_GPBIN0		(4)
+#define IRQ_GPBIN1		(5)
+#define IRQ_GPBIN2		(6)
+#define IRQ_GPBIN3		(7)
+#define IRQ_GPBIN4		(8)
+#define IRQ_GPBIN5		(9)
+#define IRQ_GPCIN0		(10)
+#define IRQ_GPCIN1		(11)
+#define IRQ_GPCIN2		(12)
+#define IRQ_GPCIN3		(13)
+#define IRQ_GPCIN4		(14)
+#define IRQ_GPCIN5		(15)
+#define IRQ_GPCIN6		(16)
+#define IRQ_GPCIN7		(17)
+#define IRQ_MSTXINT		(18)
+#define IRQ_MSRXINT		(19)
+#define IRQ_MSSTOPERRINT	(20)
+#define IRQ_TPTXINT		(21)
+#define IRQ_TPRXINT		(22)
+#define IRQ_TPSTOPERRINT	(23)
+#define SSPXMTINT		(24)
+#define SSPRCVINT		(25)
+#define SSPROR			(26)
+#define AUDXMTDMADONEA		(32)
+#define AUDRCVDMADONEA		(33)
+#define AUDXMTDMADONEB		(34)
+#define AUDRCVDMADONEB		(35)
+#define AUDTFSR			(36)
+#define AUDRFSR			(37)
+#define AUDTUR			(38)
+#define AUDROR			(39)
+#define AUDDTS			(40)
+#define AUDRDD			(41)
+#define AUDSTO			(42)
+#define IRQ_USBPWR		(43)
+#define IRQ_HCIM		(44)
+#define IRQ_HCIBUFFACC		(45)
+#define IRQ_HCIRMTWKP		(46)
+#define IRQ_NHCIMFCIR		(47)
+#define IRQ_USB_PORT_RESUME	(48)
+#define IRQ_S0_READY_NINT	(49)
+#define IRQ_S1_READY_NINT	(50)
+#define IRQ_S0_CD_VALID		(51)
+#define IRQ_S1_CD_VALID		(52)
+#define IRQ_S0_BVD1_STSCHG	(53)
+#define IRQ_S1_BVD1_STSCHG	(54)
+#define SA1111_IRQ_NR		(55)
+
+extern void sa1110_mb_enable(void);
+extern void sa1110_mb_disable(void);
+
+/*
+ * We keep the following data for the overall SA1111.  Note that the
+ * struct device and struct resource are "fake"; they should be supplied
+ * by the bus above us.  However, in the interests of getting all SA1111
+ * drivers converted over to the device model, we provide this as an
+ * anchor point for all the other drivers.
+ */
+struct sa1111 {
+	struct device	*dev;
+	struct clk	*clk;
+	unsigned long	phys;
+	int		irq;
+	int		irq_base;	/* base for cascaded on-chip IRQs */
+	spinlock_t	lock;
+	void __iomem	*base;
+	struct sa1111_platform_data *pdata;
+#ifdef CONFIG_PM
+	void		*saved_state;
+#endif
+};
+
+/*
+ * We _really_ need to eliminate this.  Its only users
+ * are the PWM and DMA checking code.
+ */
+static struct sa1111 *g_sa1111;
+
+struct sa1111_dev_info {
+	unsigned long	offset;
+	unsigned long	skpcr_mask;
+	bool		dma;
+	unsigned int	devid;
+	unsigned int	irq[6];
+};
+
+static struct sa1111_dev_info sa1111_devices[] = {
+	{
+		.offset		= SA1111_USB,
+		.skpcr_mask	= SKPCR_UCLKEN,
+		.dma		= true,
+		.devid		= SA1111_DEVID_USB,
+		.irq = {
+			IRQ_USBPWR,
+			IRQ_HCIM,
+			IRQ_HCIBUFFACC,
+			IRQ_HCIRMTWKP,
+			IRQ_NHCIMFCIR,
+			IRQ_USB_PORT_RESUME
+		},
+	},
+	{
+		.offset		= 0x0600,
+		.skpcr_mask	= SKPCR_I2SCLKEN | SKPCR_L3CLKEN,
+		.dma		= true,
+		.devid		= SA1111_DEVID_SAC,
+		.irq = {
+			AUDXMTDMADONEA,
+			AUDXMTDMADONEB,
+			AUDRCVDMADONEA,
+			AUDRCVDMADONEB
+		},
+	},
+	{
+		.offset		= 0x0800,
+		.skpcr_mask	= SKPCR_SCLKEN,
+		.devid		= SA1111_DEVID_SSP,
+	},
+	{
+		.offset		= SA1111_KBD,
+		.skpcr_mask	= SKPCR_PTCLKEN,
+		.devid		= SA1111_DEVID_PS2_KBD,
+		.irq = {
+			IRQ_TPRXINT,
+			IRQ_TPTXINT
+		},
+	},
+	{
+		.offset		= SA1111_MSE,
+		.skpcr_mask	= SKPCR_PMCLKEN,
+		.devid		= SA1111_DEVID_PS2_MSE,
+		.irq = {
+			IRQ_MSRXINT,
+			IRQ_MSTXINT
+		},
+	},
+	{
+		.offset		= 0x1800,
+		.skpcr_mask	= 0,
+		.devid		= SA1111_DEVID_PCMCIA,
+		.irq = {
+			IRQ_S0_READY_NINT,
+			IRQ_S0_CD_VALID,
+			IRQ_S0_BVD1_STSCHG,
+			IRQ_S1_READY_NINT,
+			IRQ_S1_CD_VALID,
+			IRQ_S1_BVD1_STSCHG,
+		},
+	},
+};
+
+/*
+ * SA1111 interrupt support.  Since clearing an IRQ while there are
+ * active IRQs causes the interrupt output to pulse, the upper levels
+ * will call us again if there are more interrupts to process.
+ */
+static void
+sa1111_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+	unsigned int stat0, stat1, i;
+	struct sa1111 *sachip = irq_get_handler_data(irq);
+	void __iomem *mapbase = sachip->base + SA1111_INTC;
+
+	stat0 = sa1111_readl(mapbase + SA1111_INTSTATCLR0);
+	stat1 = sa1111_readl(mapbase + SA1111_INTSTATCLR1);
+
+	sa1111_writel(stat0, mapbase + SA1111_INTSTATCLR0);
+
+	desc->irq_data.chip->irq_ack(&desc->irq_data);
+
+	sa1111_writel(stat1, mapbase + SA1111_INTSTATCLR1);
+
+	if (stat0 == 0 && stat1 == 0) {
+		do_bad_IRQ(irq, desc);
+		return;
+	}
+
+	for (i = 0; stat0; i++, stat0 >>= 1)
+		if (stat0 & 1)
+			generic_handle_irq(i + sachip->irq_base);
+
+	for (i = 32; stat1; i++, stat1 >>= 1)
+		if (stat1 & 1)
+			generic_handle_irq(i + sachip->irq_base);
+
+	/* For level-based interrupts */
+	desc->irq_data.chip->irq_unmask(&desc->irq_data);
+}
+
+#define SA1111_IRQMASK_LO(x)	(1 << (x - sachip->irq_base))
+#define SA1111_IRQMASK_HI(x)	(1 << (x - sachip->irq_base - 32))
+
+static void sa1111_ack_irq(struct irq_data *d)
+{
+}
+
+static void sa1111_mask_lowirq(struct irq_data *d)
+{
+	struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
+	void __iomem *mapbase = sachip->base + SA1111_INTC;
+	unsigned long ie0;
+
+	ie0 = sa1111_readl(mapbase + SA1111_INTEN0);
+	ie0 &= ~SA1111_IRQMASK_LO(d->irq);
+	writel(ie0, mapbase + SA1111_INTEN0);
+}
+
+static void sa1111_unmask_lowirq(struct irq_data *d)
+{
+	struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
+	void __iomem *mapbase = sachip->base + SA1111_INTC;
+	unsigned long ie0;
+
+	ie0 = sa1111_readl(mapbase + SA1111_INTEN0);
+	ie0 |= SA1111_IRQMASK_LO(d->irq);
+	sa1111_writel(ie0, mapbase + SA1111_INTEN0);
+}
+
+/*
+ * Attempt to re-trigger the interrupt.  The SA1111 contains a register
+ * (INTSET) which claims to do this.  However, in practice no amount of
+ * manipulation of INTEN and INTSET guarantees that the interrupt will
+ * be triggered.  In fact, its very difficult, if not impossible to get
+ * INTSET to re-trigger the interrupt.
+ */
+static int sa1111_retrigger_lowirq(struct irq_data *d)
+{
+	struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
+	void __iomem *mapbase = sachip->base + SA1111_INTC;
+	unsigned int mask = SA1111_IRQMASK_LO(d->irq);
+	unsigned long ip0;
+	int i;
+
+	ip0 = sa1111_readl(mapbase + SA1111_INTPOL0);
+	for (i = 0; i < 8; i++) {
+		sa1111_writel(ip0 ^ mask, mapbase + SA1111_INTPOL0);
+		sa1111_writel(ip0, mapbase + SA1111_INTPOL0);
+		if (sa1111_readl(mapbase + SA1111_INTSTATCLR0) & mask)
+			break;
+	}
+
+	if (i == 8)
+		pr_err("Danger Will Robinson: failed to re-trigger IRQ%d\n",
+		       d->irq);
+	return i == 8 ? -1 : 0;
+}
+
+static int sa1111_type_lowirq(struct irq_data *d, unsigned int flags)
+{
+	struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
+	void __iomem *mapbase = sachip->base + SA1111_INTC;
+	unsigned int mask = SA1111_IRQMASK_LO(d->irq);
+	unsigned long ip0;
+
+	if (flags == IRQ_TYPE_PROBE)
+		return 0;
+
+	if ((!(flags & IRQ_TYPE_EDGE_RISING) ^ !(flags & IRQ_TYPE_EDGE_FALLING)) == 0)
+		return -EINVAL;
+
+	ip0 = sa1111_readl(mapbase + SA1111_INTPOL0);
+	if (flags & IRQ_TYPE_EDGE_RISING)
+		ip0 &= ~mask;
+	else
+		ip0 |= mask;
+	sa1111_writel(ip0, mapbase + SA1111_INTPOL0);
+	sa1111_writel(ip0, mapbase + SA1111_WAKEPOL0);
+
+	return 0;
+}
+
+static int sa1111_wake_lowirq(struct irq_data *d, unsigned int on)
+{
+	struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
+	void __iomem *mapbase = sachip->base + SA1111_INTC;
+	unsigned int mask = SA1111_IRQMASK_LO(d->irq);
+	unsigned long we0;
+
+	we0 = sa1111_readl(mapbase + SA1111_WAKEEN0);
+	if (on)
+		we0 |= mask;
+	else
+		we0 &= ~mask;
+	sa1111_writel(we0, mapbase + SA1111_WAKEEN0);
+
+	return 0;
+}
+
+static struct irq_chip sa1111_low_chip = {
+	.name		= "SA1111-l",
+	.irq_ack	= sa1111_ack_irq,
+	.irq_mask	= sa1111_mask_lowirq,
+	.irq_unmask	= sa1111_unmask_lowirq,
+	.irq_retrigger	= sa1111_retrigger_lowirq,
+	.irq_set_type	= sa1111_type_lowirq,
+	.irq_set_wake	= sa1111_wake_lowirq,
+};
+
+static void sa1111_mask_highirq(struct irq_data *d)
+{
+	struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
+	void __iomem *mapbase = sachip->base + SA1111_INTC;
+	unsigned long ie1;
+
+	ie1 = sa1111_readl(mapbase + SA1111_INTEN1);
+	ie1 &= ~SA1111_IRQMASK_HI(d->irq);
+	sa1111_writel(ie1, mapbase + SA1111_INTEN1);
+}
+
+static void sa1111_unmask_highirq(struct irq_data *d)
+{
+	struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
+	void __iomem *mapbase = sachip->base + SA1111_INTC;
+	unsigned long ie1;
+
+	ie1 = sa1111_readl(mapbase + SA1111_INTEN1);
+	ie1 |= SA1111_IRQMASK_HI(d->irq);
+	sa1111_writel(ie1, mapbase + SA1111_INTEN1);
+}
+
+/*
+ * Attempt to re-trigger the interrupt.  The SA1111 contains a register
+ * (INTSET) which claims to do this.  However, in practice no amount of
+ * manipulation of INTEN and INTSET guarantees that the interrupt will
+ * be triggered.  In fact, its very difficult, if not impossible to get
+ * INTSET to re-trigger the interrupt.
+ */
+static int sa1111_retrigger_highirq(struct irq_data *d)
+{
+	struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
+	void __iomem *mapbase = sachip->base + SA1111_INTC;
+	unsigned int mask = SA1111_IRQMASK_HI(d->irq);
+	unsigned long ip1;
+	int i;
+
+	ip1 = sa1111_readl(mapbase + SA1111_INTPOL1);
+	for (i = 0; i < 8; i++) {
+		sa1111_writel(ip1 ^ mask, mapbase + SA1111_INTPOL1);
+		sa1111_writel(ip1, mapbase + SA1111_INTPOL1);
+		if (sa1111_readl(mapbase + SA1111_INTSTATCLR1) & mask)
+			break;
+	}
+
+	if (i == 8)
+		pr_err("Danger Will Robinson: failed to re-trigger IRQ%d\n",
+		       d->irq);
+	return i == 8 ? -1 : 0;
+}
+
+static int sa1111_type_highirq(struct irq_data *d, unsigned int flags)
+{
+	struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
+	void __iomem *mapbase = sachip->base + SA1111_INTC;
+	unsigned int mask = SA1111_IRQMASK_HI(d->irq);
+	unsigned long ip1;
+
+	if (flags == IRQ_TYPE_PROBE)
+		return 0;
+
+	if ((!(flags & IRQ_TYPE_EDGE_RISING) ^ !(flags & IRQ_TYPE_EDGE_FALLING)) == 0)
+		return -EINVAL;
+
+	ip1 = sa1111_readl(mapbase + SA1111_INTPOL1);
+	if (flags & IRQ_TYPE_EDGE_RISING)
+		ip1 &= ~mask;
+	else
+		ip1 |= mask;
+	sa1111_writel(ip1, mapbase + SA1111_INTPOL1);
+	sa1111_writel(ip1, mapbase + SA1111_WAKEPOL1);
+
+	return 0;
+}
+
+static int sa1111_wake_highirq(struct irq_data *d, unsigned int on)
+{
+	struct sa1111 *sachip = irq_data_get_irq_chip_data(d);
+	void __iomem *mapbase = sachip->base + SA1111_INTC;
+	unsigned int mask = SA1111_IRQMASK_HI(d->irq);
+	unsigned long we1;
+
+	we1 = sa1111_readl(mapbase + SA1111_WAKEEN1);
+	if (on)
+		we1 |= mask;
+	else
+		we1 &= ~mask;
+	sa1111_writel(we1, mapbase + SA1111_WAKEEN1);
+
+	return 0;
+}
+
+static struct irq_chip sa1111_high_chip = {
+	.name		= "SA1111-h",
+	.irq_ack	= sa1111_ack_irq,
+	.irq_mask	= sa1111_mask_highirq,
+	.irq_unmask	= sa1111_unmask_highirq,
+	.irq_retrigger	= sa1111_retrigger_highirq,
+	.irq_set_type	= sa1111_type_highirq,
+	.irq_set_wake	= sa1111_wake_highirq,
+};
+
+static int sa1111_setup_irq(struct sa1111 *sachip, unsigned irq_base)
+{
+	void __iomem *irqbase = sachip->base + SA1111_INTC;
+	unsigned i, irq;
+	int ret;
+
+	/*
+	 * We're guaranteed that this region hasn't been taken.
+	 */
+	request_mem_region(sachip->phys + SA1111_INTC, 512, "irq");
+
+	ret = irq_alloc_descs(-1, irq_base, SA1111_IRQ_NR, -1);
+	if (ret <= 0) {
+		dev_err(sachip->dev, "unable to allocate %u irqs: %d\n",
+			SA1111_IRQ_NR, ret);
+		if (ret == 0)
+			ret = -EINVAL;
+		return ret;
+	}
+
+	sachip->irq_base = ret;
+
+	/* disable all IRQs */
+	sa1111_writel(0, irqbase + SA1111_INTEN0);
+	sa1111_writel(0, irqbase + SA1111_INTEN1);
+	sa1111_writel(0, irqbase + SA1111_WAKEEN0);
+	sa1111_writel(0, irqbase + SA1111_WAKEEN1);
+
+	/*
+	 * detect on rising edge.  Note: Feb 2001 Errata for SA1111
+	 * specifies that S0ReadyInt and S1ReadyInt should be '1'.
+	 */
+	sa1111_writel(0, irqbase + SA1111_INTPOL0);
+	sa1111_writel(SA1111_IRQMASK_HI(IRQ_S0_READY_NINT) |
+		      SA1111_IRQMASK_HI(IRQ_S1_READY_NINT),
+		      irqbase + SA1111_INTPOL1);
+
+	/* clear all IRQs */
+	sa1111_writel(~0, irqbase + SA1111_INTSTATCLR0);
+	sa1111_writel(~0, irqbase + SA1111_INTSTATCLR1);
+
+	for (i = IRQ_GPAIN0; i <= SSPROR; i++) {
+		irq = sachip->irq_base + i;
+		irq_set_chip_and_handler(irq, &sa1111_low_chip,
+					 handle_edge_irq);
+		irq_set_chip_data(irq, sachip);
+		set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
+	}
+
+	for (i = AUDXMTDMADONEA; i <= IRQ_S1_BVD1_STSCHG; i++) {
+		irq = sachip->irq_base + i;
+		irq_set_chip_and_handler(irq, &sa1111_high_chip,
+					 handle_edge_irq);
+		irq_set_chip_data(irq, sachip);
+		set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
+	}
+
+	/*
+	 * Register SA1111 interrupt
+	 */
+	irq_set_irq_type(sachip->irq, IRQ_TYPE_EDGE_RISING);
+	irq_set_handler_data(sachip->irq, sachip);
+	irq_set_chained_handler(sachip->irq, sa1111_irq_handler);
+
+	dev_info(sachip->dev, "Providing IRQ%u-%u\n",
+		sachip->irq_base, sachip->irq_base + SA1111_IRQ_NR - 1);
+
+	return 0;
+}
+
+/*
+ * Bring the SA1111 out of reset.  This requires a set procedure:
+ *  1. nRESET asserted (by hardware)
+ *  2. CLK turned on from SA1110
+ *  3. nRESET deasserted
+ *  4. VCO turned on, PLL_BYPASS turned off
+ *  5. Wait lock time, then assert RCLKEn
+ *  7. PCR set to allow clocking of individual functions
+ *
+ * Until we've done this, the only registers we can access are:
+ *   SBI_SKCR
+ *   SBI_SMCR
+ *   SBI_SKID
+ */
+static void sa1111_wake(struct sa1111 *sachip)
+{
+	unsigned long flags, r;
+
+	spin_lock_irqsave(&sachip->lock, flags);
+
+	clk_enable(sachip->clk);
+
+	/*
+	 * Turn VCO on, and disable PLL Bypass.
+	 */
+	r = sa1111_readl(sachip->base + SA1111_SKCR);
+	r &= ~SKCR_VCO_OFF;
+	sa1111_writel(r, sachip->base + SA1111_SKCR);
+	r |= SKCR_PLL_BYPASS | SKCR_OE_EN;
+	sa1111_writel(r, sachip->base + SA1111_SKCR);
+
+	/*
+	 * Wait lock time.  SA1111 manual _doesn't_
+	 * specify a figure for this!  We choose 100us.
+	 */
+	udelay(100);
+
+	/*
+	 * Enable RCLK.  We also ensure that RDYEN is set.
+	 */
+	r |= SKCR_RCLKEN | SKCR_RDYEN;
+	sa1111_writel(r, sachip->base + SA1111_SKCR);
+
+	/*
+	 * Wait 14 RCLK cycles for the chip to finish coming out
+	 * of reset. (RCLK=24MHz).  This is 590ns.
+	 */
+	udelay(1);
+
+	/*
+	 * Ensure all clocks are initially off.
+	 */
+	sa1111_writel(0, sachip->base + SA1111_SKPCR);
+
+	spin_unlock_irqrestore(&sachip->lock, flags);
+}
+
+#ifdef CONFIG_ARCH_SA1100
+
+static u32 sa1111_dma_mask[] = {
+	~0,
+	~(1 << 20),
+	~(1 << 23),
+	~(1 << 24),
+	~(1 << 25),
+	~(1 << 20),
+	~(1 << 20),
+	0,
+};
+
+/*
+ * Configure the SA1111 shared memory controller.
+ */
+void
+sa1111_configure_smc(struct sa1111 *sachip, int sdram, unsigned int drac,
+		     unsigned int cas_latency)
+{
+	unsigned int smcr = SMCR_DTIM | SMCR_MBGE | FInsrt(drac, SMCR_DRAC);
+
+	if (cas_latency == 3)
+		smcr |= SMCR_CLAT;
+
+	sa1111_writel(smcr, sachip->base + SA1111_SMCR);
+
+	/*
+	 * Now clear the bits in the DMA mask to work around the SA1111
+	 * DMA erratum (Intel StrongARM SA-1111 Microprocessor Companion
+	 * Chip Specification Update, June 2000, Erratum #7).
+	 */
+	if (sachip->dev->dma_mask)
+		*sachip->dev->dma_mask &= sa1111_dma_mask[drac >> 2];
+
+	sachip->dev->coherent_dma_mask &= sa1111_dma_mask[drac >> 2];
+}
+#endif
+
+static void sa1111_dev_release(struct device *_dev)
+{
+	struct sa1111_dev *dev = SA1111_DEV(_dev);
+
+	kfree(dev);
+}
+
+static int
+sa1111_init_one_child(struct sa1111 *sachip, struct resource *parent,
+		      struct sa1111_dev_info *info)
+{
+	struct sa1111_dev *dev;
+	unsigned i;
+	int ret;
+
+	dev = kzalloc(sizeof(struct sa1111_dev), GFP_KERNEL);
+	if (!dev) {
+		ret = -ENOMEM;
+		goto err_alloc;
+	}
+
+	device_initialize(&dev->dev);
+	dev_set_name(&dev->dev, "%4.4lx", info->offset);
+	dev->devid	 = info->devid;
+	dev->dev.parent  = sachip->dev;
+	dev->dev.bus     = &sa1111_bus_type;
+	dev->dev.release = sa1111_dev_release;
+	dev->res.start   = sachip->phys + info->offset;
+	dev->res.end     = dev->res.start + 511;
+	dev->res.name    = dev_name(&dev->dev);
+	dev->res.flags   = IORESOURCE_MEM;
+	dev->mapbase     = sachip->base + info->offset;
+	dev->skpcr_mask  = info->skpcr_mask;
+
+	for (i = 0; i < ARRAY_SIZE(info->irq); i++)
+		dev->irq[i] = sachip->irq_base + info->irq[i];
+
+	/*
+	 * If the parent device has a DMA mask associated with it, and
+	 * this child supports DMA, propagate it down to the children.
+	 */
+	if (info->dma && sachip->dev->dma_mask) {
+		dev->dma_mask = *sachip->dev->dma_mask;
+		dev->dev.dma_mask = &dev->dma_mask;
+		dev->dev.coherent_dma_mask = sachip->dev->coherent_dma_mask;
+	}
+
+	ret = request_resource(parent, &dev->res);
+	if (ret) {
+		dev_err(sachip->dev, "failed to allocate resource for %s\n",
+			dev->res.name);
+		goto err_resource;
+	}
+
+	ret = device_add(&dev->dev);
+	if (ret)
+		goto err_add;
+	return 0;
+
+ err_add:
+	release_resource(&dev->res);
+ err_resource:
+	put_device(&dev->dev);
+ err_alloc:
+	return ret;
+}
+
+/**
+ *	sa1111_probe - probe for a single SA1111 chip.
+ *	@phys_addr: physical address of device.
+ *
+ *	Probe for a SA1111 chip.  This must be called
+ *	before any other SA1111-specific code.
+ *
+ *	Returns:
+ *	%-ENODEV	device not found.
+ *	%-EBUSY		physical address already marked in-use.
+ *	%-EINVAL	no platform data passed
+ *	%0		successful.
+ */
+static int __sa1111_probe(struct device *me, struct resource *mem, int irq)
+{
+	struct sa1111_platform_data *pd = me->platform_data;
+	struct sa1111 *sachip;
+	unsigned long id;
+	unsigned int has_devs;
+	int i, ret = -ENODEV;
+
+	if (!pd)
+		return -EINVAL;
+
+	sachip = kzalloc(sizeof(struct sa1111), GFP_KERNEL);
+	if (!sachip)
+		return -ENOMEM;
+
+	sachip->clk = clk_get(me, "SA1111_CLK");
+	if (IS_ERR(sachip->clk)) {
+		ret = PTR_ERR(sachip->clk);
+		goto err_free;
+	}
+
+	ret = clk_prepare(sachip->clk);
+	if (ret)
+		goto err_clkput;
+
+	spin_lock_init(&sachip->lock);
+
+	sachip->dev = me;
+	dev_set_drvdata(sachip->dev, sachip);
+
+	sachip->pdata = pd;
+	sachip->phys = mem->start;
+	sachip->irq = irq;
+
+	/*
+	 * Map the whole region.  This also maps the
+	 * registers for our children.
+	 */
+	sachip->base = ioremap(mem->start, PAGE_SIZE * 2);
+	if (!sachip->base) {
+		ret = -ENOMEM;
+		goto err_clk_unprep;
+	}
+
+	/*
+	 * Probe for the chip.  Only touch the SBI registers.
+	 */
+	id = sa1111_readl(sachip->base + SA1111_SKID);
+	if ((id & SKID_ID_MASK) != SKID_SA1111_ID) {
+		printk(KERN_DEBUG "SA1111 not detected: ID = %08lx\n", id);
+		ret = -ENODEV;
+		goto err_unmap;
+	}
+
+	pr_info("SA1111 Microprocessor Companion Chip: silicon revision %lx, metal revision %lx\n",
+		(id & SKID_SIREV_MASK) >> 4, id & SKID_MTREV_MASK);
+
+	/*
+	 * We found it.  Wake the chip up, and initialise.
+	 */
+	sa1111_wake(sachip);
+
+	/*
+	 * The interrupt controller must be initialised before any
+	 * other device to ensure that the interrupts are available.
+	 */
+	if (sachip->irq != NO_IRQ) {
+		ret = sa1111_setup_irq(sachip, pd->irq_base);
+		if (ret)
+			goto err_unmap;
+	}
+
+#ifdef CONFIG_ARCH_SA1100
+	{
+	unsigned int val;
+
+	/*
+	 * The SDRAM configuration of the SA1110 and the SA1111 must
+	 * match.  This is very important to ensure that SA1111 accesses
+	 * don't corrupt the SDRAM.  Note that this ungates the SA1111's
+	 * MBGNT signal, so we must have called sa1110_mb_disable()
+	 * beforehand.
+	 */
+	sa1111_configure_smc(sachip, 1,
+			     FExtr(MDCNFG, MDCNFG_SA1110_DRAC0),
+			     FExtr(MDCNFG, MDCNFG_SA1110_TDL0));
+
+	/*
+	 * We only need to turn on DCLK whenever we want to use the
+	 * DMA.  It can otherwise be held firmly in the off position.
+	 * (currently, we always enable it.)
+	 */
+	val = sa1111_readl(sachip->base + SA1111_SKPCR);
+	sa1111_writel(val | SKPCR_DCLKEN, sachip->base + SA1111_SKPCR);
+
+	/*
+	 * Enable the SA1110 memory bus request and grant signals.
+	 */
+	sa1110_mb_enable();
+	}
+#endif
+
+	g_sa1111 = sachip;
+
+	has_devs = ~0;
+	if (pd)
+		has_devs &= ~pd->disable_devs;
+
+	for (i = 0; i < ARRAY_SIZE(sa1111_devices); i++)
+		if (sa1111_devices[i].devid & has_devs)
+			sa1111_init_one_child(sachip, mem, &sa1111_devices[i]);
+
+	return 0;
+
+ err_unmap:
+	iounmap(sachip->base);
+ err_clk_unprep:
+	clk_unprepare(sachip->clk);
+ err_clkput:
+	clk_put(sachip->clk);
+ err_free:
+	kfree(sachip);
+	return ret;
+}
+
+static int sa1111_remove_one(struct device *dev, void *data)
+{
+	struct sa1111_dev *sadev = SA1111_DEV(dev);
+	device_del(&sadev->dev);
+	release_resource(&sadev->res);
+	put_device(&sadev->dev);
+	return 0;
+}
+
+static void __sa1111_remove(struct sa1111 *sachip)
+{
+	void __iomem *irqbase = sachip->base + SA1111_INTC;
+
+	device_for_each_child(sachip->dev, NULL, sa1111_remove_one);
+
+	/* disable all IRQs */
+	sa1111_writel(0, irqbase + SA1111_INTEN0);
+	sa1111_writel(0, irqbase + SA1111_INTEN1);
+	sa1111_writel(0, irqbase + SA1111_WAKEEN0);
+	sa1111_writel(0, irqbase + SA1111_WAKEEN1);
+
+	clk_disable(sachip->clk);
+	clk_unprepare(sachip->clk);
+
+	if (sachip->irq != NO_IRQ) {
+		irq_set_chained_handler(sachip->irq, NULL);
+		irq_set_handler_data(sachip->irq, NULL);
+		irq_free_descs(sachip->irq_base, SA1111_IRQ_NR);
+
+		release_mem_region(sachip->phys + SA1111_INTC, 512);
+	}
+
+	iounmap(sachip->base);
+	clk_put(sachip->clk);
+	kfree(sachip);
+}
+
+struct sa1111_save_data {
+	unsigned int	skcr;
+	unsigned int	skpcr;
+	unsigned int	skcdr;
+	unsigned char	skaud;
+	unsigned char	skpwm0;
+	unsigned char	skpwm1;
+
+	/*
+	 * Interrupt controller
+	 */
+	unsigned int	intpol0;
+	unsigned int	intpol1;
+	unsigned int	inten0;
+	unsigned int	inten1;
+	unsigned int	wakepol0;
+	unsigned int	wakepol1;
+	unsigned int	wakeen0;
+	unsigned int	wakeen1;
+};
+
+#ifdef CONFIG_PM
+
+static int sa1111_suspend(struct platform_device *dev, pm_message_t state)
+{
+	struct sa1111 *sachip = platform_get_drvdata(dev);
+	struct sa1111_save_data *save;
+	unsigned long flags;
+	unsigned int val;
+	void __iomem *base;
+
+	save = kmalloc(sizeof(struct sa1111_save_data), GFP_KERNEL);
+	if (!save)
+		return -ENOMEM;
+	sachip->saved_state = save;
+
+	spin_lock_irqsave(&sachip->lock, flags);
+
+	/*
+	 * Save state.
+	 */
+	base = sachip->base;
+	save->skcr     = sa1111_readl(base + SA1111_SKCR);
+	save->skpcr    = sa1111_readl(base + SA1111_SKPCR);
+	save->skcdr    = sa1111_readl(base + SA1111_SKCDR);
+	save->skaud    = sa1111_readl(base + SA1111_SKAUD);
+	save->skpwm0   = sa1111_readl(base + SA1111_SKPWM0);
+	save->skpwm1   = sa1111_readl(base + SA1111_SKPWM1);
+
+	sa1111_writel(0, sachip->base + SA1111_SKPWM0);
+	sa1111_writel(0, sachip->base + SA1111_SKPWM1);
+
+	base = sachip->base + SA1111_INTC;
+	save->intpol0  = sa1111_readl(base + SA1111_INTPOL0);
+	save->intpol1  = sa1111_readl(base + SA1111_INTPOL1);
+	save->inten0   = sa1111_readl(base + SA1111_INTEN0);
+	save->inten1   = sa1111_readl(base + SA1111_INTEN1);
+	save->wakepol0 = sa1111_readl(base + SA1111_WAKEPOL0);
+	save->wakepol1 = sa1111_readl(base + SA1111_WAKEPOL1);
+	save->wakeen0  = sa1111_readl(base + SA1111_WAKEEN0);
+	save->wakeen1  = sa1111_readl(base + SA1111_WAKEEN1);
+
+	/*
+	 * Disable.
+	 */
+	val = sa1111_readl(sachip->base + SA1111_SKCR);
+	sa1111_writel(val | SKCR_SLEEP, sachip->base + SA1111_SKCR);
+
+	clk_disable(sachip->clk);
+
+	spin_unlock_irqrestore(&sachip->lock, flags);
+
+#ifdef CONFIG_ARCH_SA1100
+	sa1110_mb_disable();
+#endif
+
+	return 0;
+}
+
+/*
+ *	sa1111_resume - Restore the SA1111 device state.
+ *	@dev: device to restore
+ *
+ *	Restore the general state of the SA1111; clock control and
+ *	interrupt controller.  Other parts of the SA1111 must be
+ *	restored by their respective drivers, and must be called
+ *	via LDM after this function.
+ */
+static int sa1111_resume(struct platform_device *dev)
+{
+	struct sa1111 *sachip = platform_get_drvdata(dev);
+	struct sa1111_save_data *save;
+	unsigned long flags, id;
+	void __iomem *base;
+
+	save = sachip->saved_state;
+	if (!save)
+		return 0;
+
+	/*
+	 * Ensure that the SA1111 is still here.
+	 * FIXME: shouldn't do this here.
+	 */
+	id = sa1111_readl(sachip->base + SA1111_SKID);
+	if ((id & SKID_ID_MASK) != SKID_SA1111_ID) {
+		__sa1111_remove(sachip);
+		platform_set_drvdata(dev, NULL);
+		kfree(save);
+		return 0;
+	}
+
+	/*
+	 * First of all, wake up the chip.
+	 */
+	sa1111_wake(sachip);
+
+#ifdef CONFIG_ARCH_SA1100
+	/* Enable the memory bus request/grant signals */
+	sa1110_mb_enable();
+#endif
+
+	/*
+	 * Only lock for write ops. Also, sa1111_wake must be called with
+	 * released spinlock!
+	 */
+	spin_lock_irqsave(&sachip->lock, flags);
+
+	sa1111_writel(0, sachip->base + SA1111_INTC + SA1111_INTEN0);
+	sa1111_writel(0, sachip->base + SA1111_INTC + SA1111_INTEN1);
+
+	base = sachip->base;
+	sa1111_writel(save->skcr,     base + SA1111_SKCR);
+	sa1111_writel(save->skpcr,    base + SA1111_SKPCR);
+	sa1111_writel(save->skcdr,    base + SA1111_SKCDR);
+	sa1111_writel(save->skaud,    base + SA1111_SKAUD);
+	sa1111_writel(save->skpwm0,   base + SA1111_SKPWM0);
+	sa1111_writel(save->skpwm1,   base + SA1111_SKPWM1);
+
+	base = sachip->base + SA1111_INTC;
+	sa1111_writel(save->intpol0,  base + SA1111_INTPOL0);
+	sa1111_writel(save->intpol1,  base + SA1111_INTPOL1);
+	sa1111_writel(save->inten0,   base + SA1111_INTEN0);
+	sa1111_writel(save->inten1,   base + SA1111_INTEN1);
+	sa1111_writel(save->wakepol0, base + SA1111_WAKEPOL0);
+	sa1111_writel(save->wakepol1, base + SA1111_WAKEPOL1);
+	sa1111_writel(save->wakeen0,  base + SA1111_WAKEEN0);
+	sa1111_writel(save->wakeen1,  base + SA1111_WAKEEN1);
+
+	spin_unlock_irqrestore(&sachip->lock, flags);
+
+	sachip->saved_state = NULL;
+	kfree(save);
+
+	return 0;
+}
+
+#else
+#define sa1111_suspend NULL
+#define sa1111_resume  NULL
+#endif
+
+static int sa1111_probe(struct platform_device *pdev)
+{
+	struct resource *mem;
+	int irq;
+
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!mem)
+		return -EINVAL;
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return -ENXIO;
+
+	return __sa1111_probe(&pdev->dev, mem, irq);
+}
+
+static int sa1111_remove(struct platform_device *pdev)
+{
+	struct sa1111 *sachip = platform_get_drvdata(pdev);
+
+	if (sachip) {
+#ifdef CONFIG_PM
+		kfree(sachip->saved_state);
+		sachip->saved_state = NULL;
+#endif
+		__sa1111_remove(sachip);
+		platform_set_drvdata(pdev, NULL);
+	}
+
+	return 0;
+}
+
+/*
+ *	Not sure if this should be on the system bus or not yet.
+ *	We really want some way to register a system device at
+ *	the per-machine level, and then have this driver pick
+ *	up the registered devices.
+ *
+ *	We also need to handle the SDRAM configuration for
+ *	PXA250/SA1110 machine classes.
+ */
+static struct platform_driver sa1111_device_driver = {
+	.probe		= sa1111_probe,
+	.remove		= sa1111_remove,
+	.suspend	= sa1111_suspend,
+	.resume		= sa1111_resume,
+	.driver		= {
+		.name	= "sa1111",
+	},
+};
+
+/*
+ *	Get the parent device driver (us) structure
+ *	from a child function device
+ */
+static inline struct sa1111 *sa1111_chip_driver(struct sa1111_dev *sadev)
+{
+	return (struct sa1111 *)dev_get_drvdata(sadev->dev.parent);
+}
+
+/*
+ * The bits in the opdiv field are non-linear.
+ */
+static unsigned char opdiv_table[] = { 1, 4, 2, 8 };
+
+static unsigned int __sa1111_pll_clock(struct sa1111 *sachip)
+{
+	unsigned int skcdr, fbdiv, ipdiv, opdiv;
+
+	skcdr = sa1111_readl(sachip->base + SA1111_SKCDR);
+
+	fbdiv = (skcdr & 0x007f) + 2;
+	ipdiv = ((skcdr & 0x0f80) >> 7) + 2;
+	opdiv = opdiv_table[(skcdr & 0x3000) >> 12];
+
+	return 3686400 * fbdiv / (ipdiv * opdiv);
+}
+
+/**
+ *	sa1111_pll_clock - return the current PLL clock frequency.
+ *	@sadev: SA1111 function block
+ *
+ *	BUG: we should look at SKCR.  We also blindly believe that
+ *	the chip is being fed with the 3.6864MHz clock.
+ *
+ *	Returns the PLL clock in Hz.
+ */
+unsigned int sa1111_pll_clock(struct sa1111_dev *sadev)
+{
+	struct sa1111 *sachip = sa1111_chip_driver(sadev);
+
+	return __sa1111_pll_clock(sachip);
+}
+EXPORT_SYMBOL(sa1111_pll_clock);
+
+/**
+ *	sa1111_select_audio_mode - select I2S or AC link mode
+ *	@sadev: SA1111 function block
+ *	@mode: One of %SA1111_AUDIO_ACLINK or %SA1111_AUDIO_I2S
+ *
+ *	Frob the SKCR to select AC Link mode or I2S mode for
+ *	the audio block.
+ */
+void sa1111_select_audio_mode(struct sa1111_dev *sadev, int mode)
+{
+	struct sa1111 *sachip = sa1111_chip_driver(sadev);
+	unsigned long flags;
+	unsigned int val;
+
+	spin_lock_irqsave(&sachip->lock, flags);
+
+	val = sa1111_readl(sachip->base + SA1111_SKCR);
+	if (mode == SA1111_AUDIO_I2S) {
+		val &= ~SKCR_SELAC;
+	} else {
+		val |= SKCR_SELAC;
+	}
+	sa1111_writel(val, sachip->base + SA1111_SKCR);
+
+	spin_unlock_irqrestore(&sachip->lock, flags);
+}
+EXPORT_SYMBOL(sa1111_select_audio_mode);
+
+/**
+ *	sa1111_set_audio_rate - set the audio sample rate
+ *	@sadev: SA1111 SAC function block
+ *	@rate: sample rate to select
+ */
+int sa1111_set_audio_rate(struct sa1111_dev *sadev, int rate)
+{
+	struct sa1111 *sachip = sa1111_chip_driver(sadev);
+	unsigned int div;
+
+	if (sadev->devid != SA1111_DEVID_SAC)
+		return -EINVAL;
+
+	div = (__sa1111_pll_clock(sachip) / 256 + rate / 2) / rate;
+	if (div == 0)
+		div = 1;
+	if (div > 128)
+		div = 128;
+
+	sa1111_writel(div - 1, sachip->base + SA1111_SKAUD);
+
+	return 0;
+}
+EXPORT_SYMBOL(sa1111_set_audio_rate);
+
+/**
+ *	sa1111_get_audio_rate - get the audio sample rate
+ *	@sadev: SA1111 SAC function block device
+ */
+int sa1111_get_audio_rate(struct sa1111_dev *sadev)
+{
+	struct sa1111 *sachip = sa1111_chip_driver(sadev);
+	unsigned long div;
+
+	if (sadev->devid != SA1111_DEVID_SAC)
+		return -EINVAL;
+
+	div = sa1111_readl(sachip->base + SA1111_SKAUD) + 1;
+
+	return __sa1111_pll_clock(sachip) / (256 * div);
+}
+EXPORT_SYMBOL(sa1111_get_audio_rate);
+
+void sa1111_set_io_dir(struct sa1111_dev *sadev,
+		       unsigned int bits, unsigned int dir,
+		       unsigned int sleep_dir)
+{
+	struct sa1111 *sachip = sa1111_chip_driver(sadev);
+	unsigned long flags;
+	unsigned int val;
+	void __iomem *gpio = sachip->base + SA1111_GPIO;
+
+#define MODIFY_BITS(port, mask, dir)		\
+	if (mask) {				\
+		val = sa1111_readl(port);	\
+		val &= ~(mask);			\
+		val |= (dir) & (mask);		\
+		sa1111_writel(val, port);	\
+	}
+
+	spin_lock_irqsave(&sachip->lock, flags);
+	MODIFY_BITS(gpio + SA1111_GPIO_PADDR, bits & 15, dir);
+	MODIFY_BITS(gpio + SA1111_GPIO_PBDDR, (bits >> 8) & 255, dir >> 8);
+	MODIFY_BITS(gpio + SA1111_GPIO_PCDDR, (bits >> 16) & 255, dir >> 16);
+
+	MODIFY_BITS(gpio + SA1111_GPIO_PASDR, bits & 15, sleep_dir);
+	MODIFY_BITS(gpio + SA1111_GPIO_PBSDR, (bits >> 8) & 255, sleep_dir >> 8);
+	MODIFY_BITS(gpio + SA1111_GPIO_PCSDR, (bits >> 16) & 255, sleep_dir >> 16);
+	spin_unlock_irqrestore(&sachip->lock, flags);
+}
+EXPORT_SYMBOL(sa1111_set_io_dir);
+
+void sa1111_set_io(struct sa1111_dev *sadev, unsigned int bits, unsigned int v)
+{
+	struct sa1111 *sachip = sa1111_chip_driver(sadev);
+	unsigned long flags;
+	unsigned int val;
+	void __iomem *gpio = sachip->base + SA1111_GPIO;
+
+	spin_lock_irqsave(&sachip->lock, flags);
+	MODIFY_BITS(gpio + SA1111_GPIO_PADWR, bits & 15, v);
+	MODIFY_BITS(gpio + SA1111_GPIO_PBDWR, (bits >> 8) & 255, v >> 8);
+	MODIFY_BITS(gpio + SA1111_GPIO_PCDWR, (bits >> 16) & 255, v >> 16);
+	spin_unlock_irqrestore(&sachip->lock, flags);
+}
+EXPORT_SYMBOL(sa1111_set_io);
+
+void sa1111_set_sleep_io(struct sa1111_dev *sadev, unsigned int bits, unsigned int v)
+{
+	struct sa1111 *sachip = sa1111_chip_driver(sadev);
+	unsigned long flags;
+	unsigned int val;
+	void __iomem *gpio = sachip->base + SA1111_GPIO;
+
+	spin_lock_irqsave(&sachip->lock, flags);
+	MODIFY_BITS(gpio + SA1111_GPIO_PASSR, bits & 15, v);
+	MODIFY_BITS(gpio + SA1111_GPIO_PBSSR, (bits >> 8) & 255, v >> 8);
+	MODIFY_BITS(gpio + SA1111_GPIO_PCSSR, (bits >> 16) & 255, v >> 16);
+	spin_unlock_irqrestore(&sachip->lock, flags);
+}
+EXPORT_SYMBOL(sa1111_set_sleep_io);
+
+/*
+ * Individual device operations.
+ */
+
+/**
+ *	sa1111_enable_device - enable an on-chip SA1111 function block
+ *	@sadev: SA1111 function block device to enable
+ */
+int sa1111_enable_device(struct sa1111_dev *sadev)
+{
+	struct sa1111 *sachip = sa1111_chip_driver(sadev);
+	unsigned long flags;
+	unsigned int val;
+	int ret = 0;
+
+	if (sachip->pdata && sachip->pdata->enable)
+		ret = sachip->pdata->enable(sachip->pdata->data, sadev->devid);
+
+	if (ret == 0) {
+		spin_lock_irqsave(&sachip->lock, flags);
+		val = sa1111_readl(sachip->base + SA1111_SKPCR);
+		sa1111_writel(val | sadev->skpcr_mask, sachip->base + SA1111_SKPCR);
+		spin_unlock_irqrestore(&sachip->lock, flags);
+	}
+	return ret;
+}
+EXPORT_SYMBOL(sa1111_enable_device);
+
+/**
+ *	sa1111_disable_device - disable an on-chip SA1111 function block
+ *	@sadev: SA1111 function block device to disable
+ */
+void sa1111_disable_device(struct sa1111_dev *sadev)
+{
+	struct sa1111 *sachip = sa1111_chip_driver(sadev);
+	unsigned long flags;
+	unsigned int val;
+
+	spin_lock_irqsave(&sachip->lock, flags);
+	val = sa1111_readl(sachip->base + SA1111_SKPCR);
+	sa1111_writel(val & ~sadev->skpcr_mask, sachip->base + SA1111_SKPCR);
+	spin_unlock_irqrestore(&sachip->lock, flags);
+
+	if (sachip->pdata && sachip->pdata->disable)
+		sachip->pdata->disable(sachip->pdata->data, sadev->devid);
+}
+EXPORT_SYMBOL(sa1111_disable_device);
+
+/*
+ *	SA1111 "Register Access Bus."
+ *
+ *	We model this as a regular bus type, and hang devices directly
+ *	off this.
+ */
+static int sa1111_match(struct device *_dev, struct device_driver *_drv)
+{
+	struct sa1111_dev *dev = SA1111_DEV(_dev);
+	struct sa1111_driver *drv = SA1111_DRV(_drv);
+
+	return dev->devid & drv->devid;
+}
+
+static int sa1111_bus_suspend(struct device *dev, pm_message_t state)
+{
+	struct sa1111_dev *sadev = SA1111_DEV(dev);
+	struct sa1111_driver *drv = SA1111_DRV(dev->driver);
+	int ret = 0;
+
+	if (drv && drv->suspend)
+		ret = drv->suspend(sadev, state);
+	return ret;
+}
+
+static int sa1111_bus_resume(struct device *dev)
+{
+	struct sa1111_dev *sadev = SA1111_DEV(dev);
+	struct sa1111_driver *drv = SA1111_DRV(dev->driver);
+	int ret = 0;
+
+	if (drv && drv->resume)
+		ret = drv->resume(sadev);
+	return ret;
+}
+
+static void sa1111_bus_shutdown(struct device *dev)
+{
+	struct sa1111_driver *drv = SA1111_DRV(dev->driver);
+
+	if (drv && drv->shutdown)
+		drv->shutdown(SA1111_DEV(dev));
+}
+
+static int sa1111_bus_probe(struct device *dev)
+{
+	struct sa1111_dev *sadev = SA1111_DEV(dev);
+	struct sa1111_driver *drv = SA1111_DRV(dev->driver);
+	int ret = -ENODEV;
+
+	if (drv->probe)
+		ret = drv->probe(sadev);
+	return ret;
+}
+
+static int sa1111_bus_remove(struct device *dev)
+{
+	struct sa1111_dev *sadev = SA1111_DEV(dev);
+	struct sa1111_driver *drv = SA1111_DRV(dev->driver);
+	int ret = 0;
+
+	if (drv->remove)
+		ret = drv->remove(sadev);
+	return ret;
+}
+
+struct bus_type sa1111_bus_type = {
+	.name		= "sa1111-rab",
+	.match		= sa1111_match,
+	.probe		= sa1111_bus_probe,
+	.remove		= sa1111_bus_remove,
+	.suspend	= sa1111_bus_suspend,
+	.resume		= sa1111_bus_resume,
+	.shutdown	= sa1111_bus_shutdown,
+};
+EXPORT_SYMBOL(sa1111_bus_type);
+
+int sa1111_driver_register(struct sa1111_driver *driver)
+{
+	driver->drv.bus = &sa1111_bus_type;
+	return driver_register(&driver->drv);
+}
+EXPORT_SYMBOL(sa1111_driver_register);
+
+void sa1111_driver_unregister(struct sa1111_driver *driver)
+{
+	driver_unregister(&driver->drv);
+}
+EXPORT_SYMBOL(sa1111_driver_unregister);
+
+#ifdef CONFIG_DMABOUNCE
+/*
+ * According to the "Intel StrongARM SA-1111 Microprocessor Companion
+ * Chip Specification Update" (June 2000), erratum #7, there is a
+ * significant bug in the SA1111 SDRAM shared memory controller.  If
+ * an access to a region of memory above 1MB relative to the bank base,
+ * it is important that address bit 10 _NOT_ be asserted. Depending
+ * on the configuration of the RAM, bit 10 may correspond to one
+ * of several different (processor-relative) address bits.
+ *
+ * This routine only identifies whether or not a given DMA address
+ * is susceptible to the bug.
+ *
+ * This should only get called for sa1111_device types due to the
+ * way we configure our device dma_masks.
+ */
+static int sa1111_needs_bounce(struct device *dev, dma_addr_t addr, size_t size)
+{
+	/*
+	 * Section 4.6 of the "Intel StrongARM SA-1111 Development Module
+	 * User's Guide" mentions that jumpers R51 and R52 control the
+	 * target of SA-1111 DMA (either SDRAM bank 0 on Assabet, or
+	 * SDRAM bank 1 on Neponset). The default configuration selects
+	 * Assabet, so any address in bank 1 is necessarily invalid.
+	 */
+	return (machine_is_assabet() || machine_is_pfs168()) &&
+		(addr >= 0xc8000000 || (addr + size) >= 0xc8000000);
+}
+
+static int sa1111_notifier_call(struct notifier_block *n, unsigned long action,
+	void *data)
+{
+	struct sa1111_dev *dev = SA1111_DEV(data);
+
+	switch (action) {
+	case BUS_NOTIFY_ADD_DEVICE:
+		if (dev->dev.dma_mask && dev->dma_mask < 0xffffffffUL) {
+			int ret = dmabounce_register_dev(&dev->dev, 1024, 4096,
+					sa1111_needs_bounce);
+			if (ret)
+				dev_err(&dev->dev, "failed to register with dmabounce: %d\n", ret);
+		}
+		break;
+
+	case BUS_NOTIFY_DEL_DEVICE:
+		if (dev->dev.dma_mask && dev->dma_mask < 0xffffffffUL)
+			dmabounce_unregister_dev(&dev->dev);
+		break;
+	}
+	return NOTIFY_OK;
+}
+
+static struct notifier_block sa1111_bus_notifier = {
+	.notifier_call = sa1111_notifier_call,
+};
+#endif
+
+static int __init sa1111_init(void)
+{
+	int ret = bus_register(&sa1111_bus_type);
+#ifdef CONFIG_DMABOUNCE
+	if (ret == 0)
+		bus_register_notifier(&sa1111_bus_type, &sa1111_bus_notifier);
+#endif
+	if (ret == 0)
+		platform_driver_register(&sa1111_device_driver);
+	return ret;
+}
+
+static void __exit sa1111_exit(void)
+{
+	platform_driver_unregister(&sa1111_device_driver);
+#ifdef CONFIG_DMABOUNCE
+	bus_unregister_notifier(&sa1111_bus_type, &sa1111_bus_notifier);
+#endif
+	bus_unregister(&sa1111_bus_type);
+}
+
+subsys_initcall(sa1111_init);
+module_exit(sa1111_exit);
+
+MODULE_DESCRIPTION("Intel Corporation SA1111 core driver");
+MODULE_LICENSE("GPL");
diff --git a/kernel/arch/arm/common/scoop.c b/kernel/arch/arm/common/scoop.c
new file mode 100644
index 000000000..45f4c21e3
--- /dev/null
+++ b/kernel/arch/arm/common/scoop.c
@@ -0,0 +1,275 @@
+/*
+ * Support code for the SCOOP interface found on various Sharp PDAs
+ *
+ * Copyright (c) 2004 Richard Purdie
+ *
+ *	Based on code written by Sharp/Lineo for 2.4 kernels
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/gpio.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/export.h>
+#include <linux/io.h>
+#include <asm/hardware/scoop.h>
+
+/* PCMCIA to Scoop linkage
+
+   There is no easy way to link multiple scoop devices into one
+   single entity for the pxa2xx_pcmcia device so this structure
+   is used which is setup by the platform code.
+
+   This file is never modular so this symbol is always
+   accessile to the board support files.
+*/
+struct scoop_pcmcia_config *platform_scoop_config;
+EXPORT_SYMBOL(platform_scoop_config);
+
+struct  scoop_dev {
+	void __iomem *base;
+	struct gpio_chip gpio;
+	spinlock_t scoop_lock;
+	unsigned short suspend_clr;
+	unsigned short suspend_set;
+	u32 scoop_gpwr;
+};
+
+void reset_scoop(struct device *dev)
+{
+	struct scoop_dev *sdev = dev_get_drvdata(dev);
+
+	iowrite16(0x0100, sdev->base + SCOOP_MCR);  /* 00 */
+	iowrite16(0x0000, sdev->base + SCOOP_CDR);  /* 04 */
+	iowrite16(0x0000, sdev->base + SCOOP_CCR);  /* 10 */
+	iowrite16(0x0000, sdev->base + SCOOP_IMR);  /* 18 */
+	iowrite16(0x00FF, sdev->base + SCOOP_IRM);  /* 14 */
+	iowrite16(0x0000, sdev->base + SCOOP_ISR);  /* 1C */
+	iowrite16(0x0000, sdev->base + SCOOP_IRM);
+}
+
+static void __scoop_gpio_set(struct scoop_dev *sdev,
+			unsigned offset, int value)
+{
+	unsigned short gpwr;
+
+	gpwr = ioread16(sdev->base + SCOOP_GPWR);
+	if (value)
+		gpwr |= 1 << (offset + 1);
+	else
+		gpwr &= ~(1 << (offset + 1));
+	iowrite16(gpwr, sdev->base + SCOOP_GPWR);
+}
+
+static void scoop_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+	struct scoop_dev *sdev = container_of(chip, struct scoop_dev, gpio);
+	unsigned long flags;
+
+	spin_lock_irqsave(&sdev->scoop_lock, flags);
+
+	__scoop_gpio_set(sdev, offset, value);
+
+	spin_unlock_irqrestore(&sdev->scoop_lock, flags);
+}
+
+static int scoop_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+	struct scoop_dev *sdev = container_of(chip, struct scoop_dev, gpio);
+
+	/* XXX: I'm unsure, but it seems so */
+	return ioread16(sdev->base + SCOOP_GPRR) & (1 << (offset + 1));
+}
+
+static int scoop_gpio_direction_input(struct gpio_chip *chip,
+			unsigned offset)
+{
+	struct scoop_dev *sdev = container_of(chip, struct scoop_dev, gpio);
+	unsigned long flags;
+	unsigned short gpcr;
+
+	spin_lock_irqsave(&sdev->scoop_lock, flags);
+
+	gpcr = ioread16(sdev->base + SCOOP_GPCR);
+	gpcr &= ~(1 << (offset + 1));
+	iowrite16(gpcr, sdev->base + SCOOP_GPCR);
+
+	spin_unlock_irqrestore(&sdev->scoop_lock, flags);
+
+	return 0;
+}
+
+static int scoop_gpio_direction_output(struct gpio_chip *chip,
+			unsigned offset, int value)
+{
+	struct scoop_dev *sdev = container_of(chip, struct scoop_dev, gpio);
+	unsigned long flags;
+	unsigned short gpcr;
+
+	spin_lock_irqsave(&sdev->scoop_lock, flags);
+
+	__scoop_gpio_set(sdev, offset, value);
+
+	gpcr = ioread16(sdev->base + SCOOP_GPCR);
+	gpcr |= 1 << (offset + 1);
+	iowrite16(gpcr, sdev->base + SCOOP_GPCR);
+
+	spin_unlock_irqrestore(&sdev->scoop_lock, flags);
+
+	return 0;
+}
+
+unsigned short read_scoop_reg(struct device *dev, unsigned short reg)
+{
+	struct scoop_dev *sdev = dev_get_drvdata(dev);
+	return ioread16(sdev->base + reg);
+}
+
+void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data)
+{
+	struct scoop_dev *sdev = dev_get_drvdata(dev);
+	iowrite16(data, sdev->base + reg);
+}
+
+EXPORT_SYMBOL(reset_scoop);
+EXPORT_SYMBOL(read_scoop_reg);
+EXPORT_SYMBOL(write_scoop_reg);
+
+#ifdef CONFIG_PM
+static void check_scoop_reg(struct scoop_dev *sdev)
+{
+	unsigned short mcr;
+
+	mcr = ioread16(sdev->base + SCOOP_MCR);
+	if ((mcr & 0x100) == 0)
+		iowrite16(0x0101, sdev->base + SCOOP_MCR);
+}
+
+static int scoop_suspend(struct platform_device *dev, pm_message_t state)
+{
+	struct scoop_dev *sdev = platform_get_drvdata(dev);
+
+	check_scoop_reg(sdev);
+	sdev->scoop_gpwr = ioread16(sdev->base + SCOOP_GPWR);
+	iowrite16((sdev->scoop_gpwr & ~sdev->suspend_clr) | sdev->suspend_set, sdev->base + SCOOP_GPWR);
+
+	return 0;
+}
+
+static int scoop_resume(struct platform_device *dev)
+{
+	struct scoop_dev *sdev = platform_get_drvdata(dev);
+
+	check_scoop_reg(sdev);
+	iowrite16(sdev->scoop_gpwr, sdev->base + SCOOP_GPWR);
+
+	return 0;
+}
+#else
+#define scoop_suspend	NULL
+#define scoop_resume	NULL
+#endif
+
+static int scoop_probe(struct platform_device *pdev)
+{
+	struct scoop_dev *devptr;
+	struct scoop_config *inf;
+	struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	int ret;
+
+	if (!mem)
+		return -EINVAL;
+
+	devptr = kzalloc(sizeof(struct scoop_dev), GFP_KERNEL);
+	if (!devptr)
+		return -ENOMEM;
+
+	spin_lock_init(&devptr->scoop_lock);
+
+	inf = pdev->dev.platform_data;
+	devptr->base = ioremap(mem->start, resource_size(mem));
+
+	if (!devptr->base) {
+		ret = -ENOMEM;
+		goto err_ioremap;
+	}
+
+	platform_set_drvdata(pdev, devptr);
+
+	printk("Sharp Scoop Device found at 0x%08x -> 0x%8p\n",(unsigned int)mem->start, devptr->base);
+
+	iowrite16(0x0140, devptr->base + SCOOP_MCR);
+	reset_scoop(&pdev->dev);
+	iowrite16(0x0000, devptr->base + SCOOP_CPR);
+	iowrite16(inf->io_dir & 0xffff, devptr->base + SCOOP_GPCR);
+	iowrite16(inf->io_out & 0xffff, devptr->base + SCOOP_GPWR);
+
+	devptr->suspend_clr = inf->suspend_clr;
+	devptr->suspend_set = inf->suspend_set;
+
+	devptr->gpio.base = -1;
+
+	if (inf->gpio_base != 0) {
+		devptr->gpio.label = dev_name(&pdev->dev);
+		devptr->gpio.base = inf->gpio_base;
+		devptr->gpio.ngpio = 12; /* PA11 = 0, PA12 = 1, etc. up to PA22 = 11 */
+		devptr->gpio.set = scoop_gpio_set;
+		devptr->gpio.get = scoop_gpio_get;
+		devptr->gpio.direction_input = scoop_gpio_direction_input;
+		devptr->gpio.direction_output = scoop_gpio_direction_output;
+
+		ret = gpiochip_add(&devptr->gpio);
+		if (ret)
+			goto err_gpio;
+	}
+
+	return 0;
+
+err_gpio:
+	platform_set_drvdata(pdev, NULL);
+err_ioremap:
+	iounmap(devptr->base);
+	kfree(devptr);
+
+	return ret;
+}
+
+static int scoop_remove(struct platform_device *pdev)
+{
+	struct scoop_dev *sdev = platform_get_drvdata(pdev);
+
+	if (!sdev)
+		return -EINVAL;
+
+	if (sdev->gpio.base != -1)
+		gpiochip_remove(&sdev->gpio);
+
+	platform_set_drvdata(pdev, NULL);
+	iounmap(sdev->base);
+	kfree(sdev);
+
+	return 0;
+}
+
+static struct platform_driver scoop_driver = {
+	.probe		= scoop_probe,
+	.remove		= scoop_remove,
+	.suspend	= scoop_suspend,
+	.resume		= scoop_resume,
+	.driver		= {
+		.name	= "sharp-scoop",
+	},
+};
+
+static int __init scoop_init(void)
+{
+	return platform_driver_register(&scoop_driver);
+}
+
+subsys_initcall(scoop_init);
diff --git a/kernel/arch/arm/common/sharpsl_param.c b/kernel/arch/arm/common/sharpsl_param.c
new file mode 100644
index 000000000..025f6ce38
--- /dev/null
+++ b/kernel/arch/arm/common/sharpsl_param.c
@@ -0,0 +1,65 @@
+/*
+ * Hardware parameter area specific to Sharp SL series devices
+ *
+ * Copyright (c) 2005 Richard Purdie
+ *
+ * Based on Sharp's 2.4 kernel patches
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <asm/mach/sharpsl_param.h>
+#include <asm/memory.h>
+
+/*
+ * Certain hardware parameters determined at the time of device manufacture,
+ * typically including LCD parameters are loaded by the bootloader at the
+ * address PARAM_BASE. As the kernel will overwrite them, we need to store
+ * them early in the boot process, then pass them to the appropriate drivers.
+ * Not all devices use all parameters but the format is common to all.
+ */
+#ifdef CONFIG_ARCH_SA1100
+#define PARAM_BASE	0xe8ffc000
+#define param_start(x)	(void *)(x)
+#else
+#define PARAM_BASE	0xa0000a00
+#define param_start(x)	__va(x)
+#endif
+#define MAGIC_CHG(a,b,c,d) ( ( d << 24 ) | ( c << 16 )  | ( b << 8 ) | a )
+
+#define COMADJ_MAGIC	MAGIC_CHG('C','M','A','D')
+#define UUID_MAGIC	MAGIC_CHG('U','U','I','D')
+#define TOUCH_MAGIC	MAGIC_CHG('T','U','C','H')
+#define AD_MAGIC	MAGIC_CHG('B','V','A','D')
+#define PHAD_MAGIC	MAGIC_CHG('P','H','A','D')
+
+struct sharpsl_param_info sharpsl_param;
+EXPORT_SYMBOL(sharpsl_param);
+
+void sharpsl_save_param(void)
+{
+	memcpy(&sharpsl_param, param_start(PARAM_BASE), sizeof(struct sharpsl_param_info));
+
+	if (sharpsl_param.comadj_keyword != COMADJ_MAGIC)
+		sharpsl_param.comadj=-1;
+
+	if (sharpsl_param.phad_keyword != PHAD_MAGIC)
+		sharpsl_param.phadadj=-1;
+
+	if (sharpsl_param.uuid_keyword != UUID_MAGIC)
+		sharpsl_param.uuid[0]=-1;
+
+	if (sharpsl_param.touch_keyword != TOUCH_MAGIC)
+		sharpsl_param.touch_xp=-1;
+
+	if (sharpsl_param.adadj_keyword != AD_MAGIC)
+		sharpsl_param.adadj=-1;
+}
+
+
diff --git a/kernel/arch/arm/common/timer-sp.c b/kernel/arch/arm/common/timer-sp.c
new file mode 100644
index 000000000..192113247
--- /dev/null
+++ b/kernel/arch/arm/common/timer-sp.c
@@ -0,0 +1,304 @@
+/*
+ *  linux/arch/arm/common/timer-sp.c
+ *
+ *  Copyright (C) 1999 - 2003 ARM Limited
+ *  Copyright (C) 2000 Deep Blue Solutions Ltd
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include <linux/clk.h>
+#include <linux/clocksource.h>
+#include <linux/clockchips.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/sched_clock.h>
+
+#include <asm/hardware/arm_timer.h>
+#include <asm/hardware/timer-sp.h>
+
+static long __init sp804_get_clock_rate(struct clk *clk)
+{
+	long rate;
+	int err;
+
+	err = clk_prepare(clk);
+	if (err) {
+		pr_err("sp804: clock failed to prepare: %d\n", err);
+		clk_put(clk);
+		return err;
+	}
+
+	err = clk_enable(clk);
+	if (err) {
+		pr_err("sp804: clock failed to enable: %d\n", err);
+		clk_unprepare(clk);
+		clk_put(clk);
+		return err;
+	}
+
+	rate = clk_get_rate(clk);
+	if (rate < 0) {
+		pr_err("sp804: clock failed to get rate: %ld\n", rate);
+		clk_disable(clk);
+		clk_unprepare(clk);
+		clk_put(clk);
+	}
+
+	return rate;
+}
+
+static void __iomem *sched_clock_base;
+
+static u64 notrace sp804_read(void)
+{
+	return ~readl_relaxed(sched_clock_base + TIMER_VALUE);
+}
+
+void __init __sp804_clocksource_and_sched_clock_init(void __iomem *base,
+						     const char *name,
+						     struct clk *clk,
+						     int use_sched_clock)
+{
+	long rate;
+
+	if (!clk) {
+		clk = clk_get_sys("sp804", name);
+		if (IS_ERR(clk)) {
+			pr_err("sp804: clock not found: %d\n",
+			       (int)PTR_ERR(clk));
+			return;
+		}
+	}
+
+	rate = sp804_get_clock_rate(clk);
+
+	if (rate < 0)
+		return;
+
+	/* setup timer 0 as free-running clocksource */
+	writel(0, base + TIMER_CTRL);
+	writel(0xffffffff, base + TIMER_LOAD);
+	writel(0xffffffff, base + TIMER_VALUE);
+	writel(TIMER_CTRL_32BIT | TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC,
+		base + TIMER_CTRL);
+
+	clocksource_mmio_init(base + TIMER_VALUE, name,
+		rate, 200, 32, clocksource_mmio_readl_down);
+
+	if (use_sched_clock) {
+		sched_clock_base = base;
+		sched_clock_register(sp804_read, 32, rate);
+	}
+}
+
+
+static void __iomem *clkevt_base;
+static unsigned long clkevt_reload;
+
+/*
+ * IRQ handler for the timer
+ */
+static irqreturn_t sp804_timer_interrupt(int irq, void *dev_id)
+{
+	struct clock_event_device *evt = dev_id;
+
+	/* clear the interrupt */
+	writel(1, clkevt_base + TIMER_INTCLR);
+
+	evt->event_handler(evt);
+
+	return IRQ_HANDLED;
+}
+
+static void sp804_set_mode(enum clock_event_mode mode,
+	struct clock_event_device *evt)
+{
+	unsigned long ctrl = TIMER_CTRL_32BIT | TIMER_CTRL_IE;
+
+	writel(ctrl, clkevt_base + TIMER_CTRL);
+
+	switch (mode) {
+	case CLOCK_EVT_MODE_PERIODIC:
+		writel(clkevt_reload, clkevt_base + TIMER_LOAD);
+		ctrl |= TIMER_CTRL_PERIODIC | TIMER_CTRL_ENABLE;
+		break;
+
+	case CLOCK_EVT_MODE_ONESHOT:
+		/* period set, and timer enabled in 'next_event' hook */
+		ctrl |= TIMER_CTRL_ONESHOT;
+		break;
+
+	case CLOCK_EVT_MODE_UNUSED:
+	case CLOCK_EVT_MODE_SHUTDOWN:
+	default:
+		break;
+	}
+
+	writel(ctrl, clkevt_base + TIMER_CTRL);
+}
+
+static int sp804_set_next_event(unsigned long next,
+	struct clock_event_device *evt)
+{
+	unsigned long ctrl = readl(clkevt_base + TIMER_CTRL);
+
+	writel(next, clkevt_base + TIMER_LOAD);
+	writel(ctrl | TIMER_CTRL_ENABLE, clkevt_base + TIMER_CTRL);
+
+	return 0;
+}
+
+static struct clock_event_device sp804_clockevent = {
+	.features       = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT |
+		CLOCK_EVT_FEAT_DYNIRQ,
+	.set_mode	= sp804_set_mode,
+	.set_next_event	= sp804_set_next_event,
+	.rating		= 300,
+};
+
+static struct irqaction sp804_timer_irq = {
+	.name		= "timer",
+	.flags		= IRQF_TIMER | IRQF_IRQPOLL,
+	.handler	= sp804_timer_interrupt,
+	.dev_id		= &sp804_clockevent,
+};
+
+void __init __sp804_clockevents_init(void __iomem *base, unsigned int irq, struct clk *clk, const char *name)
+{
+	struct clock_event_device *evt = &sp804_clockevent;
+	long rate;
+
+	if (!clk)
+		clk = clk_get_sys("sp804", name);
+	if (IS_ERR(clk)) {
+		pr_err("sp804: %s clock not found: %d\n", name,
+			(int)PTR_ERR(clk));
+		return;
+	}
+
+	rate = sp804_get_clock_rate(clk);
+	if (rate < 0)
+		return;
+
+	clkevt_base = base;
+	clkevt_reload = DIV_ROUND_CLOSEST(rate, HZ);
+	evt->name = name;
+	evt->irq = irq;
+	evt->cpumask = cpu_possible_mask;
+
+	writel(0, base + TIMER_CTRL);
+
+	setup_irq(irq, &sp804_timer_irq);
+	clockevents_config_and_register(evt, rate, 0xf, 0xffffffff);
+}
+
+static void __init sp804_of_init(struct device_node *np)
+{
+	static bool initialized = false;
+	void __iomem *base;
+	int irq;
+	u32 irq_num = 0;
+	struct clk *clk1, *clk2;
+	const char *name = of_get_property(np, "compatible", NULL);
+
+	base = of_iomap(np, 0);
+	if (WARN_ON(!base))
+		return;
+
+	/* Ensure timers are disabled */
+	writel(0, base + TIMER_CTRL);
+	writel(0, base + TIMER_2_BASE + TIMER_CTRL);
+
+	if (initialized || !of_device_is_available(np))
+		goto err;
+
+	clk1 = of_clk_get(np, 0);
+	if (IS_ERR(clk1))
+		clk1 = NULL;
+
+	/* Get the 2nd clock if the timer has 3 timer clocks */
+	if (of_count_phandle_with_args(np, "clocks", "#clock-cells") == 3) {
+		clk2 = of_clk_get(np, 1);
+		if (IS_ERR(clk2)) {
+			pr_err("sp804: %s clock not found: %d\n", np->name,
+				(int)PTR_ERR(clk2));
+			clk2 = NULL;
+		}
+	} else
+		clk2 = clk1;
+
+	irq = irq_of_parse_and_map(np, 0);
+	if (irq <= 0)
+		goto err;
+
+	of_property_read_u32(np, "arm,sp804-has-irq", &irq_num);
+	if (irq_num == 2) {
+		__sp804_clockevents_init(base + TIMER_2_BASE, irq, clk2, name);
+		__sp804_clocksource_and_sched_clock_init(base, name, clk1, 1);
+	} else {
+		__sp804_clockevents_init(base, irq, clk1 , name);
+		__sp804_clocksource_and_sched_clock_init(base + TIMER_2_BASE,
+							 name, clk2, 1);
+	}
+	initialized = true;
+
+	return;
+err:
+	iounmap(base);
+}
+CLOCKSOURCE_OF_DECLARE(sp804, "arm,sp804", sp804_of_init);
+
+static void __init integrator_cp_of_init(struct device_node *np)
+{
+	static int init_count = 0;
+	void __iomem *base;
+	int irq;
+	const char *name = of_get_property(np, "compatible", NULL);
+	struct clk *clk;
+
+	base = of_iomap(np, 0);
+	if (WARN_ON(!base))
+		return;
+	clk = of_clk_get(np, 0);
+	if (WARN_ON(IS_ERR(clk)))
+		return;
+
+	/* Ensure timer is disabled */
+	writel(0, base + TIMER_CTRL);
+
+	if (init_count == 2 || !of_device_is_available(np))
+		goto err;
+
+	if (!init_count)
+		__sp804_clocksource_and_sched_clock_init(base, name, clk, 0);
+	else {
+		irq = irq_of_parse_and_map(np, 0);
+		if (irq <= 0)
+			goto err;
+
+		__sp804_clockevents_init(base, irq, clk, name);
+	}
+
+	init_count++;
+	return;
+err:
+	iounmap(base);
+}
+CLOCKSOURCE_OF_DECLARE(intcp, "arm,integrator-cp-timer", integrator_cp_of_init);
diff --git a/kernel/arch/arm/common/vlock.S b/kernel/arch/arm/common/vlock.S
new file mode 100644
index 000000000..8b7df283f
--- /dev/null
+++ b/kernel/arch/arm/common/vlock.S
@@ -0,0 +1,108 @@
+/*
+ * vlock.S - simple voting lock implementation for ARM
+ *
+ * Created by:	Dave Martin, 2012-08-16
+ * Copyright:	(C) 2012-2013  Linaro Limited
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ *
+ * This algorithm is described in more detail in
+ * Documentation/arm/vlocks.txt.
+ */
+
+#include <linux/linkage.h>
+#include "vlock.h"
+
+/* Select different code if voting flags  can fit in a single word. */
+#if VLOCK_VOTING_SIZE > 4
+#define FEW(x...)
+#define MANY(x...) x
+#else
+#define FEW(x...) x
+#define MANY(x...)
+#endif
+
+@ voting lock for first-man coordination
+
+.macro voting_begin rbase:req, rcpu:req, rscratch:req
+	mov	\rscratch, #1
+	strb	\rscratch, [\rbase, \rcpu]
+	dmb
+.endm
+
+.macro voting_end rbase:req, rcpu:req, rscratch:req
+	dmb
+	mov	\rscratch, #0
+	strb	\rscratch, [\rbase, \rcpu]
+	dsb	st
+	sev
+.endm
+
+/*
+ * The vlock structure must reside in Strongly-Ordered or Device memory.
+ * This implementation deliberately eliminates most of the barriers which
+ * would be required for other memory types, and assumes that independent
+ * writes to neighbouring locations within a cacheline do not interfere
+ * with one another.
+ */
+
+@ r0: lock structure base
+@ r1: CPU ID (0-based index within cluster)
+ENTRY(vlock_trylock)
+	add	r1, r1, #VLOCK_VOTING_OFFSET
+
+	voting_begin	r0, r1, r2
+
+	ldrb	r2, [r0, #VLOCK_OWNER_OFFSET]	@ check whether lock is held
+	cmp	r2, #VLOCK_OWNER_NONE
+	bne	trylock_fail			@ fail if so
+
+	@ Control dependency implies strb not observable before previous ldrb.
+
+	strb	r1, [r0, #VLOCK_OWNER_OFFSET]	@ submit my vote
+
+	voting_end	r0, r1, r2		@ implies DMB
+
+	@ Wait for the current round of voting to finish:
+
+ MANY(	mov	r3, #VLOCK_VOTING_OFFSET			)
+0:
+ MANY(	ldr	r2, [r0, r3]					)
+ FEW(	ldr	r2, [r0, #VLOCK_VOTING_OFFSET]			)
+	cmp	r2, #0
+	wfene
+	bne	0b
+ MANY(	add	r3, r3, #4					)
+ MANY(	cmp	r3, #VLOCK_VOTING_OFFSET + VLOCK_VOTING_SIZE	)
+ MANY(	bne	0b						)
+
+	@ Check who won:
+
+	dmb
+	ldrb	r2, [r0, #VLOCK_OWNER_OFFSET]
+	eor	r0, r1, r2			@ zero if I won, else nonzero
+	bx	lr
+
+trylock_fail:
+	voting_end	r0, r1, r2
+	mov	r0, #1				@ nonzero indicates that I lost
+	bx	lr
+ENDPROC(vlock_trylock)
+
+@ r0: lock structure base
+ENTRY(vlock_unlock)
+	dmb
+	mov	r1, #VLOCK_OWNER_NONE
+	strb	r1, [r0, #VLOCK_OWNER_OFFSET]
+	dsb	st
+	sev
+	bx	lr
+ENDPROC(vlock_unlock)
diff --git a/kernel/arch/arm/common/vlock.h b/kernel/arch/arm/common/vlock.h
new file mode 100644
index 000000000..3b441475a
--- /dev/null
+++ b/kernel/arch/arm/common/vlock.h
@@ -0,0 +1,29 @@
+/*
+ * vlock.h - simple voting lock implementation
+ *
+ * Created by:	Dave Martin, 2012-08-16
+ * Copyright:	(C) 2012-2013  Linaro Limited
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __VLOCK_H
+#define __VLOCK_H
+
+#include <asm/mcpm.h>
+
+/* Offsets and sizes are rounded to a word (4 bytes) */
+#define VLOCK_OWNER_OFFSET	0
+#define VLOCK_VOTING_OFFSET	4
+#define VLOCK_VOTING_SIZE	((MAX_CPUS_PER_CLUSTER + 3) / 4 * 4)
+#define VLOCK_SIZE		(VLOCK_VOTING_OFFSET + VLOCK_VOTING_SIZE)
+#define VLOCK_OWNER_NONE	0
+
+#endif /* ! __VLOCK_H */