13 files changed, 3636 insertions, 0 deletions

diff --git a/kernel/arch/arm/plat-omap/Kconfig b/kernel/arch/arm/plat-omap/Kconfig
new file mode 100644
index 000000000..d055db32f
--- /dev/null
+++ b/kernel/arch/arm/plat-omap/Kconfig
@@ -0,0 +1,161 @@
+config ARCH_OMAP
+	bool
+
+if ARCH_OMAP
+
+menu "TI OMAP Common Features"
+
+config ARCH_OMAP_OTG
+	bool
+
+comment "OMAP Feature Selections"
+
+config OMAP_DEBUG_DEVICES
+	bool
+	help
+	  For debug cards on TI reference boards.
+
+config OMAP_DEBUG_LEDS
+	def_bool y if NEW_LEDS
+	depends on OMAP_DEBUG_DEVICES
+	select LEDS_CLASS
+
+config POWER_AVS_OMAP
+	bool "AVS(Adaptive Voltage Scaling) support for OMAP IP versions 1&2"
+	depends on POWER_AVS && (ARCH_OMAP3 || ARCH_OMAP4) && PM
+	select POWER_SUPPLY
+	help
+	  Say Y to enable AVS(Adaptive Voltage Scaling)
+	  support on OMAP containing the version 1 or
+	  version 2 of the SmartReflex IP.
+	  V1 is the 65nm version used in OMAP3430.
+	  V2 is the update for the 45nm version of the IP used in OMAP3630
+	  and OMAP4430
+
+	  Please note, that by default SmartReflex is only
+	  initialized and not enabled. To enable the automatic voltage
+	  compensation for vdd mpu and vdd core from user space,
+	  user must write 1 to
+		/debug/smartreflex/sr_<X>/autocomp,
+	  where X is mpu_iva or core for OMAP3.
+	  Optionally autocompensation can be enabled in the kernel
+	  by default during system init via the enable_on_init flag
+	  which an be passed as platform data to the smartreflex driver.
+
+config POWER_AVS_OMAP_CLASS3
+	bool "Class 3 mode of Smartreflex Implementation"
+	depends on POWER_AVS_OMAP && TWL4030_CORE
+	help
+	  Say Y to enable Class 3 implementation of Smartreflex
+
+	  Class 3 implementation of Smartreflex employs continuous hardware
+	  voltage calibration.
+
+config OMAP_RESET_CLOCKS
+	bool "Reset unused clocks during boot"
+	depends on ARCH_OMAP
+	help
+	  Say Y if you want to reset unused clocks during boot.
+	  This option saves power, but assumes all drivers are
+	  using the clock framework. Broken drivers that do not
+	  yet use clock framework may not work with this option.
+	  If you are booting from another operating system, you
+	  probably do not want this option enabled until your
+	  device drivers work properly.
+
+config OMAP_MUX
+	bool "OMAP multiplexing support"
+	depends on ARCH_OMAP
+	default y
+	help
+	  Pin multiplexing support for OMAP boards. If your bootloader
+	  sets the multiplexing correctly, say N. Otherwise, or if unsure,
+	  say Y.
+
+config OMAP_MUX_DEBUG
+	bool "Multiplexing debug output"
+	depends on OMAP_MUX
+	help
+	  Makes the multiplexing functions print out a lot of debug info.
+	  This is useful if you want to find out the correct values of the
+	  multiplexing registers.
+
+config OMAP_MUX_WARNINGS
+	bool "Warn about pins the bootloader didn't set up"
+	depends on OMAP_MUX
+	default y
+	help
+	  Choose Y here to warn whenever driver initialization logic needs
+	  to change the pin multiplexing setup.	 When there are no warnings
+	  printed, it's safe to deselect OMAP_MUX for your product.
+
+config OMAP_MPU_TIMER
+	bool "Use mpu timer"
+	depends on ARCH_OMAP1
+	help
+	  Select this option if you want to use the OMAP mpu timer. This
+	  timer provides more intra-tick resolution than the 32KHz timer,
+	  but consumes more power.
+
+config OMAP_32K_TIMER
+	bool "Use 32KHz timer"
+	depends on ARCH_OMAP16XX || ARCH_OMAP2PLUS
+	default y if (ARCH_OMAP16XX || ARCH_OMAP2PLUS)
+	help
+	  Select this option if you want to enable the OMAP 32KHz timer.
+	  This timer saves power compared to the OMAP_MPU_TIMER, and has
+	  support for no tick during idle. The 32KHz timer provides less
+	  intra-tick resolution than OMAP_MPU_TIMER. The 32KHz timer is
+	  currently only available for OMAP16XX, 24XX, 34XX, OMAP4/5 and DRA7XX.
+
+	  On OMAP2PLUS this value is only used for CONFIG_HZ and
+	  CLOCK_TICK_RATE compile time calculation.
+	  The actual timer selection is done in the board file
+	  through the (DT_)MACHINE_START structure.
+
+
+config OMAP3_L2_AUX_SECURE_SAVE_RESTORE
+	bool "OMAP3 HS/EMU save and restore for L2 AUX control register"
+	depends on ARCH_OMAP3 && PM
+	default n
+	help
+	  Without this option, L2 Auxiliary control register contents are
+	  lost during off-mode entry on HS/EMU devices. This feature
+	  requires support from PPA / boot-loader in HS/EMU devices, which
+	  currently does not exist by default.
+
+config OMAP3_L2_AUX_SECURE_SERVICE_SET_ID
+	int "Service ID for the support routine to set L2 AUX control"
+	depends on OMAP3_L2_AUX_SECURE_SAVE_RESTORE
+	default 43
+	help
+	  PPA routine service ID for setting L2 auxiliary control register.
+
+config OMAP_DM_TIMER
+	bool "Use dual-mode timer"
+	depends on ARCH_OMAP16XX || ARCH_OMAP2PLUS
+	help
+	 Select this option if you want to use OMAP Dual-Mode timers.
+
+config OMAP_SERIAL_WAKE
+	bool "Enable wake-up events for serial ports"
+	depends on ARCH_OMAP1 && OMAP_MUX
+	default y
+	help
+	  Select this option if you want to have your system wake up
+	  to data on the serial RX line. This allows you to wake the
+	  system from serial console.
+
+choice
+	prompt "OMAP PM layer selection"
+	depends on ARCH_OMAP
+	default OMAP_PM_NOOP
+
+config OMAP_PM_NOOP
+	bool "No-op/debug PM layer"
+
+endchoice
+
+endmenu
+
+endif
diff --git a/kernel/arch/arm/plat-omap/Makefile b/kernel/arch/arm/plat-omap/Makefile
new file mode 100644
index 000000000..97a50e888
--- /dev/null
+++ b/kernel/arch/arm/plat-omap/Makefile
@@ -0,0 +1,16 @@
+#
+# Makefile for the linux kernel.
+#
+
+ccflags-$(CONFIG_ARCH_MULTIPLATFORM) := -I$(srctree)/arch/arm/plat-omap/include
+
+# Common support
+obj-y := sram.o dma.o counter_32k.o
+
+# omap_device support (OMAP2+ only at the moment)
+
+obj-$(CONFIG_OMAP_DM_TIMER) += dmtimer.o
+obj-$(CONFIG_OMAP_DEBUG_LEDS) += debug-leds.o
+i2c-omap-$(CONFIG_I2C_OMAP) := i2c.o
+obj-y += $(i2c-omap-m) $(i2c-omap-y)
+
diff --git a/kernel/arch/arm/plat-omap/counter_32k.c b/kernel/arch/arm/plat-omap/counter_32k.c
new file mode 100644
index 000000000..2438b9600
--- /dev/null
+++ b/kernel/arch/arm/plat-omap/counter_32k.c
@@ -0,0 +1,117 @@
+/*
+ * OMAP 32ksynctimer/counter_32k-related code
+ *
+ * Copyright (C) 2009 Texas Instruments
+ * Copyright (C) 2010 Nokia Corporation
+ * Tony Lindgren <tony@atomide.com>
+ * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.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.
+ *
+ * NOTE: This timer is not the same timer as the old OMAP1 MPU timer.
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/clocksource.h>
+#include <linux/sched_clock.h>
+
+#include <asm/mach/time.h>
+
+#include <plat/counter-32k.h>
+
+/* OMAP2_32KSYNCNT_CR_OFF: offset of 32ksync counter register */
+#define OMAP2_32KSYNCNT_REV_OFF		0x0
+#define OMAP2_32KSYNCNT_REV_SCHEME	(0x3 << 30)
+#define OMAP2_32KSYNCNT_CR_OFF_LOW	0x10
+#define OMAP2_32KSYNCNT_CR_OFF_HIGH	0x30
+
+/*
+ * 32KHz clocksource ... always available, on pretty most chips except
+ * OMAP 730 and 1510.  Other timers could be used as clocksources, with
+ * higher resolution in free-running counter modes (e.g. 12 MHz xtal),
+ * but systems won't necessarily want to spend resources that way.
+ */
+static void __iomem *sync32k_cnt_reg;
+
+static u64 notrace omap_32k_read_sched_clock(void)
+{
+	return sync32k_cnt_reg ? readl_relaxed(sync32k_cnt_reg) : 0;
+}
+
+/**
+ * omap_read_persistent_clock64 -  Return time from a persistent clock.
+ *
+ * Reads the time from a source which isn't disabled during PM, the
+ * 32k sync timer.  Convert the cycles elapsed since last read into
+ * nsecs and adds to a monotonically increasing timespec64.
+ */
+static struct timespec64 persistent_ts;
+static cycles_t cycles;
+static unsigned int persistent_mult, persistent_shift;
+
+static void omap_read_persistent_clock64(struct timespec64 *ts)
+{
+	unsigned long long nsecs;
+	cycles_t last_cycles;
+
+	last_cycles = cycles;
+	cycles = sync32k_cnt_reg ? readl_relaxed(sync32k_cnt_reg) : 0;
+
+	nsecs = clocksource_cyc2ns(cycles - last_cycles,
+					persistent_mult, persistent_shift);
+
+	timespec64_add_ns(&persistent_ts, nsecs);
+
+	*ts = persistent_ts;
+}
+
+/**
+ * omap_init_clocksource_32k - setup and register counter 32k as a
+ * kernel clocksource
+ * @pbase: base addr of counter_32k module
+ * @size: size of counter_32k to map
+ *
+ * Returns 0 upon success or negative error code upon failure.
+ *
+ */
+int __init omap_init_clocksource_32k(void __iomem *vbase)
+{
+	int ret;
+
+	/*
+	 * 32k sync Counter IP register offsets vary between the
+	 * highlander version and the legacy ones.
+	 * The 'SCHEME' bits(30-31) of the revision register is used
+	 * to identify the version.
+	 */
+	if (readl_relaxed(vbase + OMAP2_32KSYNCNT_REV_OFF) &
+						OMAP2_32KSYNCNT_REV_SCHEME)
+		sync32k_cnt_reg = vbase + OMAP2_32KSYNCNT_CR_OFF_HIGH;
+	else
+		sync32k_cnt_reg = vbase + OMAP2_32KSYNCNT_CR_OFF_LOW;
+
+	/*
+	 * 120000 rough estimate from the calculations in
+	 * __clocksource_update_freq_scale.
+	 */
+	clocks_calc_mult_shift(&persistent_mult, &persistent_shift,
+			32768, NSEC_PER_SEC, 120000);
+
+	ret = clocksource_mmio_init(sync32k_cnt_reg, "32k_counter", 32768,
+				250, 32, clocksource_mmio_readl_up);
+	if (ret) {
+		pr_err("32k_counter: can't register clocksource\n");
+		return ret;
+	}
+
+	sched_clock_register(omap_32k_read_sched_clock, 32, 32768);
+	register_persistent_clock(NULL, omap_read_persistent_clock64);
+	pr_info("OMAP clocksource: 32k_counter at 32768 Hz\n");
+
+	return 0;
+}
diff --git a/kernel/arch/arm/plat-omap/debug-leds.c b/kernel/arch/arm/plat-omap/debug-leds.c
new file mode 100644
index 000000000..48b69de89
--- /dev/null
+++ b/kernel/arch/arm/plat-omap/debug-leds.c
@@ -0,0 +1,174 @@
+/*
+ * linux/arch/arm/plat-omap/debug-leds.c
+ *
+ * Copyright 2011 by Bryan Wu <bryan.wu@canonical.com>
+ * Copyright 2003 by Texas Instruments Incorporated
+ *
+ * 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/platform_device.h>
+#include <linux/leds.h>
+#include <linux/io.h>
+#include <linux/platform_data/gpio-omap.h>
+#include <linux/slab.h>
+
+#include <asm/mach-types.h>
+
+/* Many OMAP development platforms reuse the same "debug board"; these
+ * platforms include H2, H3, H4, and Perseus2.  There are 16 LEDs on the
+ * debug board (all green), accessed through FPGA registers.
+ */
+
+/* NOTE:  most boards don't have a static mapping for the FPGA ... */
+struct h2p2_dbg_fpga {
+	/* offset 0x00 */
+	u16		smc91x[8];
+	/* offset 0x10 */
+	u16		fpga_rev;
+	u16		board_rev;
+	u16		gpio_outputs;
+	u16		leds;
+	/* offset 0x18 */
+	u16		misc_inputs;
+	u16		lan_status;
+	u16		lan_reset;
+	u16		reserved0;
+	/* offset 0x20 */
+	u16		ps2_data;
+	u16		ps2_ctrl;
+	/* plus also 4 rs232 ports ... */
+};
+
+static struct h2p2_dbg_fpga __iomem *fpga;
+
+static u16 fpga_led_state;
+
+struct dbg_led {
+	struct led_classdev	cdev;
+	u16			mask;
+};
+
+static const struct {
+	const char *name;
+	const char *trigger;
+} dbg_leds[] = {
+	{ "dbg:d4", "heartbeat", },
+	{ "dbg:d5", "cpu0", },
+	{ "dbg:d6", "default-on", },
+	{ "dbg:d7", },
+	{ "dbg:d8", },
+	{ "dbg:d9", },
+	{ "dbg:d10", },
+	{ "dbg:d11", },
+	{ "dbg:d12", },
+	{ "dbg:d13", },
+	{ "dbg:d14", },
+	{ "dbg:d15", },
+	{ "dbg:d16", },
+	{ "dbg:d17", },
+	{ "dbg:d18", },
+	{ "dbg:d19", },
+};
+
+/*
+ * The triggers lines up below will only be used if the
+ * LED triggers are compiled in.
+ */
+static void dbg_led_set(struct led_classdev *cdev,
+			      enum led_brightness b)
+{
+	struct dbg_led *led = container_of(cdev, struct dbg_led, cdev);
+	u16 reg;
+
+	reg = readw_relaxed(&fpga->leds);
+	if (b != LED_OFF)
+		reg |= led->mask;
+	else
+		reg &= ~led->mask;
+	writew_relaxed(reg, &fpga->leds);
+}
+
+static enum led_brightness dbg_led_get(struct led_classdev *cdev)
+{
+	struct dbg_led *led = container_of(cdev, struct dbg_led, cdev);
+	u16 reg;
+
+	reg = readw_relaxed(&fpga->leds);
+	return (reg & led->mask) ? LED_FULL : LED_OFF;
+}
+
+static int fpga_probe(struct platform_device *pdev)
+{
+	struct resource	*iomem;
+	int i;
+
+	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!iomem)
+		return -ENODEV;
+
+	fpga = ioremap(iomem->start, resource_size(iomem));
+	writew_relaxed(0xff, &fpga->leds);
+
+	for (i = 0; i < ARRAY_SIZE(dbg_leds); i++) {
+		struct dbg_led *led;
+
+		led = kzalloc(sizeof(*led), GFP_KERNEL);
+		if (!led)
+			break;
+
+		led->cdev.name = dbg_leds[i].name;
+		led->cdev.brightness_set = dbg_led_set;
+		led->cdev.brightness_get = dbg_led_get;
+		led->cdev.default_trigger = dbg_leds[i].trigger;
+		led->mask = BIT(i);
+
+		if (led_classdev_register(NULL, &led->cdev) < 0) {
+			kfree(led);
+			break;
+		}
+	}
+
+	return 0;
+}
+
+static int fpga_suspend_noirq(struct device *dev)
+{
+	fpga_led_state = readw_relaxed(&fpga->leds);
+	writew_relaxed(0xff, &fpga->leds);
+
+	return 0;
+}
+
+static int fpga_resume_noirq(struct device *dev)
+{
+	writew_relaxed(~fpga_led_state, &fpga->leds);
+	return 0;
+}
+
+static const struct dev_pm_ops fpga_dev_pm_ops = {
+	.suspend_noirq = fpga_suspend_noirq,
+	.resume_noirq = fpga_resume_noirq,
+};
+
+static struct platform_driver led_driver = {
+	.driver.name	= "omap_dbg_led",
+	.driver.pm	= &fpga_dev_pm_ops,
+	.probe		= fpga_probe,
+};
+
+static int __init fpga_init(void)
+{
+	if (machine_is_omap_h4()
+			|| machine_is_omap_h3()
+			|| machine_is_omap_h2()
+			|| machine_is_omap_perseus2()
+			)
+		return platform_driver_register(&led_driver);
+	return 0;
+}
+fs_initcall(fpga_init);
diff --git a/kernel/arch/arm/plat-omap/dma.c b/kernel/arch/arm/plat-omap/dma.c
new file mode 100644
index 000000000..6416e03b4
--- /dev/null
+++ b/kernel/arch/arm/plat-omap/dma.c
@@ -0,0 +1,1466 @@
+/*
+ * linux/arch/arm/plat-omap/dma.c
+ *
+ * Copyright (C) 2003 - 2008 Nokia Corporation
+ * Author: Juha Yrjölä <juha.yrjola@nokia.com>
+ * DMA channel linking for 1610 by Samuel Ortiz <samuel.ortiz@nokia.com>
+ * Graphics DMA and LCD DMA graphics tranformations
+ * by Imre Deak <imre.deak@nokia.com>
+ * OMAP2/3 support Copyright (C) 2004-2007 Texas Instruments, Inc.
+ * Merged to support both OMAP1 and OMAP2 by Tony Lindgren <tony@atomide.com>
+ * Some functions based on earlier dma-omap.c Copyright (C) 2001 RidgeRun, Inc.
+ *
+ * Copyright (C) 2009 Texas Instruments
+ * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
+ *
+ * Support functions for the OMAP internal DMA channels.
+ *
+ * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
+ * Converted DMA library into DMA platform driver.
+ *	- G, Manjunath Kondaiah <manjugk@ti.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/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#include <linux/omap-dma.h>
+
+/*
+ * MAX_LOGICAL_DMA_CH_COUNT: the maximum number of logical DMA
+ * channels that an instance of the SDMA IP block can support.  Used
+ * to size arrays.  (The actual maximum on a particular SoC may be less
+ * than this -- for example, OMAP1 SDMA instances only support 17 logical
+ * DMA channels.)
+ */
+#define MAX_LOGICAL_DMA_CH_COUNT		32
+
+#undef DEBUG
+
+#ifndef CONFIG_ARCH_OMAP1
+enum { DMA_CH_ALLOC_DONE, DMA_CH_PARAMS_SET_DONE, DMA_CH_STARTED,
+	DMA_CH_QUEUED, DMA_CH_NOTSTARTED, DMA_CH_PAUSED, DMA_CH_LINK_ENABLED
+};
+
+enum { DMA_CHAIN_STARTED, DMA_CHAIN_NOTSTARTED };
+#endif
+
+#define OMAP_DMA_ACTIVE			0x01
+#define OMAP2_DMA_CSR_CLEAR_MASK	0xffffffff
+
+#define OMAP_FUNC_MUX_ARM_BASE		(0xfffe1000 + 0xec)
+
+static struct omap_system_dma_plat_info *p;
+static struct omap_dma_dev_attr *d;
+static void omap_clear_dma(int lch);
+static int omap_dma_set_prio_lch(int lch, unsigned char read_prio,
+				 unsigned char write_prio);
+static int enable_1510_mode;
+static u32 errata;
+
+static struct omap_dma_global_context_registers {
+	u32 dma_irqenable_l0;
+	u32 dma_irqenable_l1;
+	u32 dma_ocp_sysconfig;
+	u32 dma_gcr;
+} omap_dma_global_context;
+
+struct dma_link_info {
+	int *linked_dmach_q;
+	int no_of_lchs_linked;
+
+	int q_count;
+	int q_tail;
+	int q_head;
+
+	int chain_state;
+	int chain_mode;
+
+};
+
+static struct dma_link_info *dma_linked_lch;
+
+#ifndef CONFIG_ARCH_OMAP1
+
+/* Chain handling macros */
+#define OMAP_DMA_CHAIN_QINIT(chain_id)					\
+	do {								\
+		dma_linked_lch[chain_id].q_head =			\
+		dma_linked_lch[chain_id].q_tail =			\
+		dma_linked_lch[chain_id].q_count = 0;			\
+	} while (0)
+#define OMAP_DMA_CHAIN_QFULL(chain_id)					\
+		(dma_linked_lch[chain_id].no_of_lchs_linked ==		\
+		dma_linked_lch[chain_id].q_count)
+#define OMAP_DMA_CHAIN_QLAST(chain_id)					\
+	do {								\
+		((dma_linked_lch[chain_id].no_of_lchs_linked-1) ==	\
+		dma_linked_lch[chain_id].q_count)			\
+	} while (0)
+#define OMAP_DMA_CHAIN_QEMPTY(chain_id)					\
+		(0 == dma_linked_lch[chain_id].q_count)
+#define __OMAP_DMA_CHAIN_INCQ(end)					\
+	((end) = ((end)+1) % dma_linked_lch[chain_id].no_of_lchs_linked)
+#define OMAP_DMA_CHAIN_INCQHEAD(chain_id)				\
+	do {								\
+		__OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_head);	\
+		dma_linked_lch[chain_id].q_count--;			\
+	} while (0)
+
+#define OMAP_DMA_CHAIN_INCQTAIL(chain_id)				\
+	do {								\
+		__OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_tail);	\
+		dma_linked_lch[chain_id].q_count++; \
+	} while (0)
+#endif
+
+static int dma_lch_count;
+static int dma_chan_count;
+static int omap_dma_reserve_channels;
+
+static spinlock_t dma_chan_lock;
+static struct omap_dma_lch *dma_chan;
+
+static inline void disable_lnk(int lch);
+static void omap_disable_channel_irq(int lch);
+static inline void omap_enable_channel_irq(int lch);
+
+#define REVISIT_24XX()		printk(KERN_ERR "FIXME: no %s on 24xx\n", \
+						__func__);
+
+#ifdef CONFIG_ARCH_OMAP15XX
+/* Returns 1 if the DMA module is in OMAP1510-compatible mode, 0 otherwise */
+static int omap_dma_in_1510_mode(void)
+{
+	return enable_1510_mode;
+}
+#else
+#define omap_dma_in_1510_mode()		0
+#endif
+
+#ifdef CONFIG_ARCH_OMAP1
+static inline void set_gdma_dev(int req, int dev)
+{
+	u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
+	int shift = ((req - 1) % 5) * 6;
+	u32 l;
+
+	l = omap_readl(reg);
+	l &= ~(0x3f << shift);
+	l |= (dev - 1) << shift;
+	omap_writel(l, reg);
+}
+#else
+#define set_gdma_dev(req, dev)	do {} while (0)
+#define omap_readl(reg)		0
+#define omap_writel(val, reg)	do {} while (0)
+#endif
+
+#ifdef CONFIG_ARCH_OMAP1
+void omap_set_dma_priority(int lch, int dst_port, int priority)
+{
+	unsigned long reg;
+	u32 l;
+
+	if (dma_omap1()) {
+		switch (dst_port) {
+		case OMAP_DMA_PORT_OCP_T1:	/* FFFECC00 */
+			reg = OMAP_TC_OCPT1_PRIOR;
+			break;
+		case OMAP_DMA_PORT_OCP_T2:	/* FFFECCD0 */
+			reg = OMAP_TC_OCPT2_PRIOR;
+			break;
+		case OMAP_DMA_PORT_EMIFF:	/* FFFECC08 */
+			reg = OMAP_TC_EMIFF_PRIOR;
+			break;
+		case OMAP_DMA_PORT_EMIFS:	/* FFFECC04 */
+			reg = OMAP_TC_EMIFS_PRIOR;
+			break;
+		default:
+			BUG();
+			return;
+		}
+		l = omap_readl(reg);
+		l &= ~(0xf << 8);
+		l |= (priority & 0xf) << 8;
+		omap_writel(l, reg);
+	}
+}
+#endif
+
+#ifdef CONFIG_ARCH_OMAP2PLUS
+void omap_set_dma_priority(int lch, int dst_port, int priority)
+{
+	u32 ccr;
+
+	ccr = p->dma_read(CCR, lch);
+	if (priority)
+		ccr |= (1 << 6);
+	else
+		ccr &= ~(1 << 6);
+	p->dma_write(ccr, CCR, lch);
+}
+#endif
+EXPORT_SYMBOL(omap_set_dma_priority);
+
+void omap_set_dma_transfer_params(int lch, int data_type, int elem_count,
+				  int frame_count, int sync_mode,
+				  int dma_trigger, int src_or_dst_synch)
+{
+	u32 l;
+
+	l = p->dma_read(CSDP, lch);
+	l &= ~0x03;
+	l |= data_type;
+	p->dma_write(l, CSDP, lch);
+
+	if (dma_omap1()) {
+		u16 ccr;
+
+		ccr = p->dma_read(CCR, lch);
+		ccr &= ~(1 << 5);
+		if (sync_mode == OMAP_DMA_SYNC_FRAME)
+			ccr |= 1 << 5;
+		p->dma_write(ccr, CCR, lch);
+
+		ccr = p->dma_read(CCR2, lch);
+		ccr &= ~(1 << 2);
+		if (sync_mode == OMAP_DMA_SYNC_BLOCK)
+			ccr |= 1 << 2;
+		p->dma_write(ccr, CCR2, lch);
+	}
+
+	if (dma_omap2plus() && dma_trigger) {
+		u32 val;
+
+		val = p->dma_read(CCR, lch);
+
+		/* DMA_SYNCHRO_CONTROL_UPPER depends on the channel number */
+		val &= ~((1 << 23) | (3 << 19) | 0x1f);
+		val |= (dma_trigger & ~0x1f) << 14;
+		val |= dma_trigger & 0x1f;
+
+		if (sync_mode & OMAP_DMA_SYNC_FRAME)
+			val |= 1 << 5;
+		else
+			val &= ~(1 << 5);
+
+		if (sync_mode & OMAP_DMA_SYNC_BLOCK)
+			val |= 1 << 18;
+		else
+			val &= ~(1 << 18);
+
+		if (src_or_dst_synch == OMAP_DMA_DST_SYNC_PREFETCH) {
+			val &= ~(1 << 24);	/* dest synch */
+			val |= (1 << 23);	/* Prefetch */
+		} else if (src_or_dst_synch) {
+			val |= 1 << 24;		/* source synch */
+		} else {
+			val &= ~(1 << 24);	/* dest synch */
+		}
+		p->dma_write(val, CCR, lch);
+	}
+
+	p->dma_write(elem_count, CEN, lch);
+	p->dma_write(frame_count, CFN, lch);
+}
+EXPORT_SYMBOL(omap_set_dma_transfer_params);
+
+void omap_set_dma_write_mode(int lch, enum omap_dma_write_mode mode)
+{
+	if (dma_omap2plus()) {
+		u32 csdp;
+
+		csdp = p->dma_read(CSDP, lch);
+		csdp &= ~(0x3 << 16);
+		csdp |= (mode << 16);
+		p->dma_write(csdp, CSDP, lch);
+	}
+}
+EXPORT_SYMBOL(omap_set_dma_write_mode);
+
+void omap_set_dma_channel_mode(int lch, enum omap_dma_channel_mode mode)
+{
+	if (dma_omap1() && !dma_omap15xx()) {
+		u32 l;
+
+		l = p->dma_read(LCH_CTRL, lch);
+		l &= ~0x7;
+		l |= mode;
+		p->dma_write(l, LCH_CTRL, lch);
+	}
+}
+EXPORT_SYMBOL(omap_set_dma_channel_mode);
+
+/* Note that src_port is only for omap1 */
+void omap_set_dma_src_params(int lch, int src_port, int src_amode,
+			     unsigned long src_start,
+			     int src_ei, int src_fi)
+{
+	u32 l;
+
+	if (dma_omap1()) {
+		u16 w;
+
+		w = p->dma_read(CSDP, lch);
+		w &= ~(0x1f << 2);
+		w |= src_port << 2;
+		p->dma_write(w, CSDP, lch);
+	}
+
+	l = p->dma_read(CCR, lch);
+	l &= ~(0x03 << 12);
+	l |= src_amode << 12;
+	p->dma_write(l, CCR, lch);
+
+	p->dma_write(src_start, CSSA, lch);
+
+	p->dma_write(src_ei, CSEI, lch);
+	p->dma_write(src_fi, CSFI, lch);
+}
+EXPORT_SYMBOL(omap_set_dma_src_params);
+
+void omap_set_dma_params(int lch, struct omap_dma_channel_params *params)
+{
+	omap_set_dma_transfer_params(lch, params->data_type,
+				     params->elem_count, params->frame_count,
+				     params->sync_mode, params->trigger,
+				     params->src_or_dst_synch);
+	omap_set_dma_src_params(lch, params->src_port,
+				params->src_amode, params->src_start,
+				params->src_ei, params->src_fi);
+
+	omap_set_dma_dest_params(lch, params->dst_port,
+				 params->dst_amode, params->dst_start,
+				 params->dst_ei, params->dst_fi);
+	if (params->read_prio || params->write_prio)
+		omap_dma_set_prio_lch(lch, params->read_prio,
+				      params->write_prio);
+}
+EXPORT_SYMBOL(omap_set_dma_params);
+
+void omap_set_dma_src_data_pack(int lch, int enable)
+{
+	u32 l;
+
+	l = p->dma_read(CSDP, lch);
+	l &= ~(1 << 6);
+	if (enable)
+		l |= (1 << 6);
+	p->dma_write(l, CSDP, lch);
+}
+EXPORT_SYMBOL(omap_set_dma_src_data_pack);
+
+void omap_set_dma_src_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
+{
+	unsigned int burst = 0;
+	u32 l;
+
+	l = p->dma_read(CSDP, lch);
+	l &= ~(0x03 << 7);
+
+	switch (burst_mode) {
+	case OMAP_DMA_DATA_BURST_DIS:
+		break;
+	case OMAP_DMA_DATA_BURST_4:
+		if (dma_omap2plus())
+			burst = 0x1;
+		else
+			burst = 0x2;
+		break;
+	case OMAP_DMA_DATA_BURST_8:
+		if (dma_omap2plus()) {
+			burst = 0x2;
+			break;
+		}
+		/*
+		 * not supported by current hardware on OMAP1
+		 * w |= (0x03 << 7);
+		 * fall through
+		 */
+	case OMAP_DMA_DATA_BURST_16:
+		if (dma_omap2plus()) {
+			burst = 0x3;
+			break;
+		}
+		/*
+		 * OMAP1 don't support burst 16
+		 * fall through
+		 */
+	default:
+		BUG();
+	}
+
+	l |= (burst << 7);
+	p->dma_write(l, CSDP, lch);
+}
+EXPORT_SYMBOL(omap_set_dma_src_burst_mode);
+
+/* Note that dest_port is only for OMAP1 */
+void omap_set_dma_dest_params(int lch, int dest_port, int dest_amode,
+			      unsigned long dest_start,
+			      int dst_ei, int dst_fi)
+{
+	u32 l;
+
+	if (dma_omap1()) {
+		l = p->dma_read(CSDP, lch);
+		l &= ~(0x1f << 9);
+		l |= dest_port << 9;
+		p->dma_write(l, CSDP, lch);
+	}
+
+	l = p->dma_read(CCR, lch);
+	l &= ~(0x03 << 14);
+	l |= dest_amode << 14;
+	p->dma_write(l, CCR, lch);
+
+	p->dma_write(dest_start, CDSA, lch);
+
+	p->dma_write(dst_ei, CDEI, lch);
+	p->dma_write(dst_fi, CDFI, lch);
+}
+EXPORT_SYMBOL(omap_set_dma_dest_params);
+
+void omap_set_dma_dest_data_pack(int lch, int enable)
+{
+	u32 l;
+
+	l = p->dma_read(CSDP, lch);
+	l &= ~(1 << 13);
+	if (enable)
+		l |= 1 << 13;
+	p->dma_write(l, CSDP, lch);
+}
+EXPORT_SYMBOL(omap_set_dma_dest_data_pack);
+
+void omap_set_dma_dest_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
+{
+	unsigned int burst = 0;
+	u32 l;
+
+	l = p->dma_read(CSDP, lch);
+	l &= ~(0x03 << 14);
+
+	switch (burst_mode) {
+	case OMAP_DMA_DATA_BURST_DIS:
+		break;
+	case OMAP_DMA_DATA_BURST_4:
+		if (dma_omap2plus())
+			burst = 0x1;
+		else
+			burst = 0x2;
+		break;
+	case OMAP_DMA_DATA_BURST_8:
+		if (dma_omap2plus())
+			burst = 0x2;
+		else
+			burst = 0x3;
+		break;
+	case OMAP_DMA_DATA_BURST_16:
+		if (dma_omap2plus()) {
+			burst = 0x3;
+			break;
+		}
+		/*
+		 * OMAP1 don't support burst 16
+		 * fall through
+		 */
+	default:
+		printk(KERN_ERR "Invalid DMA burst mode\n");
+		BUG();
+		return;
+	}
+	l |= (burst << 14);
+	p->dma_write(l, CSDP, lch);
+}
+EXPORT_SYMBOL(omap_set_dma_dest_burst_mode);
+
+static inline void omap_enable_channel_irq(int lch)
+{
+	/* Clear CSR */
+	if (dma_omap1())
+		p->dma_read(CSR, lch);
+	else
+		p->dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR, lch);
+
+	/* Enable some nice interrupts. */
+	p->dma_write(dma_chan[lch].enabled_irqs, CICR, lch);
+}
+
+static inline void omap_disable_channel_irq(int lch)
+{
+	/* disable channel interrupts */
+	p->dma_write(0, CICR, lch);
+	/* Clear CSR */
+	if (dma_omap1())
+		p->dma_read(CSR, lch);
+	else
+		p->dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR, lch);
+}
+
+void omap_enable_dma_irq(int lch, u16 bits)
+{
+	dma_chan[lch].enabled_irqs |= bits;
+}
+EXPORT_SYMBOL(omap_enable_dma_irq);
+
+void omap_disable_dma_irq(int lch, u16 bits)
+{
+	dma_chan[lch].enabled_irqs &= ~bits;
+}
+EXPORT_SYMBOL(omap_disable_dma_irq);
+
+static inline void enable_lnk(int lch)
+{
+	u32 l;
+
+	l = p->dma_read(CLNK_CTRL, lch);
+
+	if (dma_omap1())
+		l &= ~(1 << 14);
+
+	/* Set the ENABLE_LNK bits */
+	if (dma_chan[lch].next_lch != -1)
+		l = dma_chan[lch].next_lch | (1 << 15);
+
+#ifndef CONFIG_ARCH_OMAP1
+	if (dma_omap2plus())
+		if (dma_chan[lch].next_linked_ch != -1)
+			l = dma_chan[lch].next_linked_ch | (1 << 15);
+#endif
+
+	p->dma_write(l, CLNK_CTRL, lch);
+}
+
+static inline void disable_lnk(int lch)
+{
+	u32 l;
+
+	l = p->dma_read(CLNK_CTRL, lch);
+
+	/* Disable interrupts */
+	omap_disable_channel_irq(lch);
+
+	if (dma_omap1()) {
+		/* Set the STOP_LNK bit */
+		l |= 1 << 14;
+	}
+
+	if (dma_omap2plus()) {
+		/* Clear the ENABLE_LNK bit */
+		l &= ~(1 << 15);
+	}
+
+	p->dma_write(l, CLNK_CTRL, lch);
+	dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
+}
+
+static inline void omap2_enable_irq_lch(int lch)
+{
+	u32 val;
+	unsigned long flags;
+
+	if (dma_omap1())
+		return;
+
+	spin_lock_irqsave(&dma_chan_lock, flags);
+	/* clear IRQ STATUS */
+	p->dma_write(1 << lch, IRQSTATUS_L0, lch);
+	/* Enable interrupt */
+	val = p->dma_read(IRQENABLE_L0, lch);
+	val |= 1 << lch;
+	p->dma_write(val, IRQENABLE_L0, lch);
+	spin_unlock_irqrestore(&dma_chan_lock, flags);
+}
+
+static inline void omap2_disable_irq_lch(int lch)
+{
+	u32 val;
+	unsigned long flags;
+
+	if (dma_omap1())
+		return;
+
+	spin_lock_irqsave(&dma_chan_lock, flags);
+	/* Disable interrupt */
+	val = p->dma_read(IRQENABLE_L0, lch);
+	val &= ~(1 << lch);
+	p->dma_write(val, IRQENABLE_L0, lch);
+	/* clear IRQ STATUS */
+	p->dma_write(1 << lch, IRQSTATUS_L0, lch);
+	spin_unlock_irqrestore(&dma_chan_lock, flags);
+}
+
+int omap_request_dma(int dev_id, const char *dev_name,
+		     void (*callback)(int lch, u16 ch_status, void *data),
+		     void *data, int *dma_ch_out)
+{
+	int ch, free_ch = -1;
+	unsigned long flags;
+	struct omap_dma_lch *chan;
+
+	WARN(strcmp(dev_name, "DMA engine"), "Using deprecated platform DMA API - please update to DMA engine");
+
+	spin_lock_irqsave(&dma_chan_lock, flags);
+	for (ch = 0; ch < dma_chan_count; ch++) {
+		if (free_ch == -1 && dma_chan[ch].dev_id == -1) {
+			free_ch = ch;
+			/* Exit after first free channel found */
+			break;
+		}
+	}
+	if (free_ch == -1) {
+		spin_unlock_irqrestore(&dma_chan_lock, flags);
+		return -EBUSY;
+	}
+	chan = dma_chan + free_ch;
+	chan->dev_id = dev_id;
+
+	if (p->clear_lch_regs)
+		p->clear_lch_regs(free_ch);
+
+	if (dma_omap2plus())
+		omap_clear_dma(free_ch);
+
+	spin_unlock_irqrestore(&dma_chan_lock, flags);
+
+	chan->dev_name = dev_name;
+	chan->callback = callback;
+	chan->data = data;
+	chan->flags = 0;
+
+#ifndef CONFIG_ARCH_OMAP1
+	if (dma_omap2plus()) {
+		chan->chain_id = -1;
+		chan->next_linked_ch = -1;
+	}
+#endif
+
+	chan->enabled_irqs = OMAP_DMA_DROP_IRQ | OMAP_DMA_BLOCK_IRQ;
+
+	if (dma_omap1())
+		chan->enabled_irqs |= OMAP1_DMA_TOUT_IRQ;
+	else if (dma_omap2plus())
+		chan->enabled_irqs |= OMAP2_DMA_MISALIGNED_ERR_IRQ |
+			OMAP2_DMA_TRANS_ERR_IRQ;
+
+	if (dma_omap16xx()) {
+		/* If the sync device is set, configure it dynamically. */
+		if (dev_id != 0) {
+			set_gdma_dev(free_ch + 1, dev_id);
+			dev_id = free_ch + 1;
+		}
+		/*
+		 * Disable the 1510 compatibility mode and set the sync device
+		 * id.
+		 */
+		p->dma_write(dev_id | (1 << 10), CCR, free_ch);
+	} else if (dma_omap1()) {
+		p->dma_write(dev_id, CCR, free_ch);
+	}
+
+	if (dma_omap2plus()) {
+		omap_enable_channel_irq(free_ch);
+		omap2_enable_irq_lch(free_ch);
+	}
+
+	*dma_ch_out = free_ch;
+
+	return 0;
+}
+EXPORT_SYMBOL(omap_request_dma);
+
+void omap_free_dma(int lch)
+{
+	unsigned long flags;
+
+	if (dma_chan[lch].dev_id == -1) {
+		pr_err("omap_dma: trying to free unallocated DMA channel %d\n",
+		       lch);
+		return;
+	}
+
+	/* Disable interrupt for logical channel */
+	if (dma_omap2plus())
+		omap2_disable_irq_lch(lch);
+
+	/* Disable all DMA interrupts for the channel. */
+	omap_disable_channel_irq(lch);
+
+	/* Make sure the DMA transfer is stopped. */
+	p->dma_write(0, CCR, lch);
+
+	/* Clear registers */
+	if (dma_omap2plus())
+		omap_clear_dma(lch);
+
+	spin_lock_irqsave(&dma_chan_lock, flags);
+	dma_chan[lch].dev_id = -1;
+	dma_chan[lch].next_lch = -1;
+	dma_chan[lch].callback = NULL;
+	spin_unlock_irqrestore(&dma_chan_lock, flags);
+}
+EXPORT_SYMBOL(omap_free_dma);
+
+/**
+ * @brief omap_dma_set_global_params : Set global priority settings for dma
+ *
+ * @param arb_rate
+ * @param max_fifo_depth
+ * @param tparams - Number of threads to reserve : DMA_THREAD_RESERVE_NORM
+ * 						   DMA_THREAD_RESERVE_ONET
+ * 						   DMA_THREAD_RESERVE_TWOT
+ * 						   DMA_THREAD_RESERVE_THREET
+ */
+void
+omap_dma_set_global_params(int arb_rate, int max_fifo_depth, int tparams)
+{
+	u32 reg;
+
+	if (dma_omap1()) {
+		printk(KERN_ERR "FIXME: no %s on 15xx/16xx\n", __func__);
+		return;
+	}
+
+	if (max_fifo_depth == 0)
+		max_fifo_depth = 1;
+	if (arb_rate == 0)
+		arb_rate = 1;
+
+	reg = 0xff & max_fifo_depth;
+	reg |= (0x3 & tparams) << 12;
+	reg |= (arb_rate & 0xff) << 16;
+
+	p->dma_write(reg, GCR, 0);
+}
+EXPORT_SYMBOL(omap_dma_set_global_params);
+
+/**
+ * @brief omap_dma_set_prio_lch : Set channel wise priority settings
+ *
+ * @param lch
+ * @param read_prio - Read priority
+ * @param write_prio - Write priority
+ * Both of the above can be set with one of the following values :
+ * 	DMA_CH_PRIO_HIGH/DMA_CH_PRIO_LOW
+ */
+static int
+omap_dma_set_prio_lch(int lch, unsigned char read_prio,
+		      unsigned char write_prio)
+{
+	u32 l;
+
+	if (unlikely((lch < 0 || lch >= dma_lch_count))) {
+		printk(KERN_ERR "Invalid channel id\n");
+		return -EINVAL;
+	}
+	l = p->dma_read(CCR, lch);
+	l &= ~((1 << 6) | (1 << 26));
+	if (d->dev_caps & IS_RW_PRIORITY)
+		l |= ((read_prio & 0x1) << 6) | ((write_prio & 0x1) << 26);
+	else
+		l |= ((read_prio & 0x1) << 6);
+
+	p->dma_write(l, CCR, lch);
+
+	return 0;
+}
+
+
+/*
+ * Clears any DMA state so the DMA engine is ready to restart with new buffers
+ * through omap_start_dma(). Any buffers in flight are discarded.
+ */
+static void omap_clear_dma(int lch)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	p->clear_dma(lch);
+	local_irq_restore(flags);
+}
+
+void omap_start_dma(int lch)
+{
+	u32 l;
+
+	/*
+	 * The CPC/CDAC register needs to be initialized to zero
+	 * before starting dma transfer.
+	 */
+	if (dma_omap15xx())
+		p->dma_write(0, CPC, lch);
+	else
+		p->dma_write(0, CDAC, lch);
+
+	if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
+		int next_lch, cur_lch;
+		char dma_chan_link_map[MAX_LOGICAL_DMA_CH_COUNT];
+
+		/* Set the link register of the first channel */
+		enable_lnk(lch);
+
+		memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
+		dma_chan_link_map[lch] = 1;
+
+		cur_lch = dma_chan[lch].next_lch;
+		do {
+			next_lch = dma_chan[cur_lch].next_lch;
+
+			/* The loop case: we've been here already */
+			if (dma_chan_link_map[cur_lch])
+				break;
+			/* Mark the current channel */
+			dma_chan_link_map[cur_lch] = 1;
+
+			enable_lnk(cur_lch);
+			omap_enable_channel_irq(cur_lch);
+
+			cur_lch = next_lch;
+		} while (next_lch != -1);
+	} else if (IS_DMA_ERRATA(DMA_ERRATA_PARALLEL_CHANNELS))
+		p->dma_write(lch, CLNK_CTRL, lch);
+
+	omap_enable_channel_irq(lch);
+
+	l = p->dma_read(CCR, lch);
+
+	if (IS_DMA_ERRATA(DMA_ERRATA_IFRAME_BUFFERING))
+			l |= OMAP_DMA_CCR_BUFFERING_DISABLE;
+	l |= OMAP_DMA_CCR_EN;
+
+	/*
+	 * As dma_write() uses IO accessors which are weakly ordered, there
+	 * is no guarantee that data in coherent DMA memory will be visible
+	 * to the DMA device.  Add a memory barrier here to ensure that any
+	 * such data is visible prior to enabling DMA.
+	 */
+	mb();
+	p->dma_write(l, CCR, lch);
+
+	dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
+}
+EXPORT_SYMBOL(omap_start_dma);
+
+void omap_stop_dma(int lch)
+{
+	u32 l;
+
+	/* Disable all interrupts on the channel */
+	omap_disable_channel_irq(lch);
+
+	l = p->dma_read(CCR, lch);
+	if (IS_DMA_ERRATA(DMA_ERRATA_i541) &&
+			(l & OMAP_DMA_CCR_SEL_SRC_DST_SYNC)) {
+		int i = 0;
+		u32 sys_cf;
+
+		/* Configure No-Standby */
+		l = p->dma_read(OCP_SYSCONFIG, lch);
+		sys_cf = l;
+		l &= ~DMA_SYSCONFIG_MIDLEMODE_MASK;
+		l |= DMA_SYSCONFIG_MIDLEMODE(DMA_IDLEMODE_NO_IDLE);
+		p->dma_write(l , OCP_SYSCONFIG, 0);
+
+		l = p->dma_read(CCR, lch);
+		l &= ~OMAP_DMA_CCR_EN;
+		p->dma_write(l, CCR, lch);
+
+		/* Wait for sDMA FIFO drain */
+		l = p->dma_read(CCR, lch);
+		while (i < 100 && (l & (OMAP_DMA_CCR_RD_ACTIVE |
+					OMAP_DMA_CCR_WR_ACTIVE))) {
+			udelay(5);
+			i++;
+			l = p->dma_read(CCR, lch);
+		}
+		if (i >= 100)
+			pr_err("DMA drain did not complete on lch %d\n", lch);
+		/* Restore OCP_SYSCONFIG */
+		p->dma_write(sys_cf, OCP_SYSCONFIG, lch);
+	} else {
+		l &= ~OMAP_DMA_CCR_EN;
+		p->dma_write(l, CCR, lch);
+	}
+
+	/*
+	 * Ensure that data transferred by DMA is visible to any access
+	 * after DMA has been disabled.  This is important for coherent
+	 * DMA regions.
+	 */
+	mb();
+
+	if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
+		int next_lch, cur_lch = lch;
+		char dma_chan_link_map[MAX_LOGICAL_DMA_CH_COUNT];
+
+		memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
+		do {
+			/* The loop case: we've been here already */
+			if (dma_chan_link_map[cur_lch])
+				break;
+			/* Mark the current channel */
+			dma_chan_link_map[cur_lch] = 1;
+
+			disable_lnk(cur_lch);
+
+			next_lch = dma_chan[cur_lch].next_lch;
+			cur_lch = next_lch;
+		} while (next_lch != -1);
+	}
+
+	dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
+}
+EXPORT_SYMBOL(omap_stop_dma);
+
+/*
+ * Allows changing the DMA callback function or data. This may be needed if
+ * the driver shares a single DMA channel for multiple dma triggers.
+ */
+int omap_set_dma_callback(int lch,
+			  void (*callback)(int lch, u16 ch_status, void *data),
+			  void *data)
+{
+	unsigned long flags;
+
+	if (lch < 0)
+		return -ENODEV;
+
+	spin_lock_irqsave(&dma_chan_lock, flags);
+	if (dma_chan[lch].dev_id == -1) {
+		printk(KERN_ERR "DMA callback for not set for free channel\n");
+		spin_unlock_irqrestore(&dma_chan_lock, flags);
+		return -EINVAL;
+	}
+	dma_chan[lch].callback = callback;
+	dma_chan[lch].data = data;
+	spin_unlock_irqrestore(&dma_chan_lock, flags);
+
+	return 0;
+}
+EXPORT_SYMBOL(omap_set_dma_callback);
+
+/*
+ * Returns current physical source address for the given DMA channel.
+ * If the channel is running the caller must disable interrupts prior calling
+ * this function and process the returned value before re-enabling interrupt to
+ * prevent races with the interrupt handler. Note that in continuous mode there
+ * is a chance for CSSA_L register overflow between the two reads resulting
+ * in incorrect return value.
+ */
+dma_addr_t omap_get_dma_src_pos(int lch)
+{
+	dma_addr_t offset = 0;
+
+	if (dma_omap15xx())
+		offset = p->dma_read(CPC, lch);
+	else
+		offset = p->dma_read(CSAC, lch);
+
+	if (IS_DMA_ERRATA(DMA_ERRATA_3_3) && offset == 0)
+		offset = p->dma_read(CSAC, lch);
+
+	if (!dma_omap15xx()) {
+		/*
+		 * CDAC == 0 indicates that the DMA transfer on the channel has
+		 * not been started (no data has been transferred so far).
+		 * Return the programmed source start address in this case.
+		 */
+		if (likely(p->dma_read(CDAC, lch)))
+			offset = p->dma_read(CSAC, lch);
+		else
+			offset = p->dma_read(CSSA, lch);
+	}
+
+	if (dma_omap1())
+		offset |= (p->dma_read(CSSA, lch) & 0xFFFF0000);
+
+	return offset;
+}
+EXPORT_SYMBOL(omap_get_dma_src_pos);
+
+/*
+ * Returns current physical destination address for the given DMA channel.
+ * If the channel is running the caller must disable interrupts prior calling
+ * this function and process the returned value before re-enabling interrupt to
+ * prevent races with the interrupt handler. Note that in continuous mode there
+ * is a chance for CDSA_L register overflow between the two reads resulting
+ * in incorrect return value.
+ */
+dma_addr_t omap_get_dma_dst_pos(int lch)
+{
+	dma_addr_t offset = 0;
+
+	if (dma_omap15xx())
+		offset = p->dma_read(CPC, lch);
+	else
+		offset = p->dma_read(CDAC, lch);
+
+	/*
+	 * omap 3.2/3.3 erratum: sometimes 0 is returned if CSAC/CDAC is
+	 * read before the DMA controller finished disabling the channel.
+	 */
+	if (!dma_omap15xx() && offset == 0) {
+		offset = p->dma_read(CDAC, lch);
+		/*
+		 * CDAC == 0 indicates that the DMA transfer on the channel has
+		 * not been started (no data has been transferred so far).
+		 * Return the programmed destination start address in this case.
+		 */
+		if (unlikely(!offset))
+			offset = p->dma_read(CDSA, lch);
+	}
+
+	if (dma_omap1())
+		offset |= (p->dma_read(CDSA, lch) & 0xFFFF0000);
+
+	return offset;
+}
+EXPORT_SYMBOL(omap_get_dma_dst_pos);
+
+int omap_get_dma_active_status(int lch)
+{
+	return (p->dma_read(CCR, lch) & OMAP_DMA_CCR_EN) != 0;
+}
+EXPORT_SYMBOL(omap_get_dma_active_status);
+
+int omap_dma_running(void)
+{
+	int lch;
+
+	if (dma_omap1())
+		if (omap_lcd_dma_running())
+			return 1;
+
+	for (lch = 0; lch < dma_chan_count; lch++)
+		if (p->dma_read(CCR, lch) & OMAP_DMA_CCR_EN)
+			return 1;
+
+	return 0;
+}
+
+/*
+ * lch_queue DMA will start right after lch_head one is finished.
+ * For this DMA link to start, you still need to start (see omap_start_dma)
+ * the first one. That will fire up the entire queue.
+ */
+void omap_dma_link_lch(int lch_head, int lch_queue)
+{
+	if (omap_dma_in_1510_mode()) {
+		if (lch_head == lch_queue) {
+			p->dma_write(p->dma_read(CCR, lch_head) | (3 << 8),
+								CCR, lch_head);
+			return;
+		}
+		printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
+		BUG();
+		return;
+	}
+
+	if ((dma_chan[lch_head].dev_id == -1) ||
+	    (dma_chan[lch_queue].dev_id == -1)) {
+		pr_err("omap_dma: trying to link non requested channels\n");
+		dump_stack();
+	}
+
+	dma_chan[lch_head].next_lch = lch_queue;
+}
+EXPORT_SYMBOL(omap_dma_link_lch);
+
+/*----------------------------------------------------------------------------*/
+
+#ifdef CONFIG_ARCH_OMAP1
+
+static int omap1_dma_handle_ch(int ch)
+{
+	u32 csr;
+
+	if (enable_1510_mode && ch >= 6) {
+		csr = dma_chan[ch].saved_csr;
+		dma_chan[ch].saved_csr = 0;
+	} else
+		csr = p->dma_read(CSR, ch);
+	if (enable_1510_mode && ch <= 2 && (csr >> 7) != 0) {
+		dma_chan[ch + 6].saved_csr = csr >> 7;
+		csr &= 0x7f;
+	}
+	if ((csr & 0x3f) == 0)
+		return 0;
+	if (unlikely(dma_chan[ch].dev_id == -1)) {
+		pr_warn("Spurious interrupt from DMA channel %d (CSR %04x)\n",
+			ch, csr);
+		return 0;
+	}
+	if (unlikely(csr & OMAP1_DMA_TOUT_IRQ))
+		pr_warn("DMA timeout with device %d\n", dma_chan[ch].dev_id);
+	if (unlikely(csr & OMAP_DMA_DROP_IRQ))
+		pr_warn("DMA synchronization event drop occurred with device %d\n",
+			dma_chan[ch].dev_id);
+	if (likely(csr & OMAP_DMA_BLOCK_IRQ))
+		dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
+	if (likely(dma_chan[ch].callback != NULL))
+		dma_chan[ch].callback(ch, csr, dma_chan[ch].data);
+
+	return 1;
+}
+
+static irqreturn_t omap1_dma_irq_handler(int irq, void *dev_id)
+{
+	int ch = ((int) dev_id) - 1;
+	int handled = 0;
+
+	for (;;) {
+		int handled_now = 0;
+
+		handled_now += omap1_dma_handle_ch(ch);
+		if (enable_1510_mode && dma_chan[ch + 6].saved_csr)
+			handled_now += omap1_dma_handle_ch(ch + 6);
+		if (!handled_now)
+			break;
+		handled += handled_now;
+	}
+
+	return handled ? IRQ_HANDLED : IRQ_NONE;
+}
+
+#else
+#define omap1_dma_irq_handler	NULL
+#endif
+
+#ifdef CONFIG_ARCH_OMAP2PLUS
+
+static int omap2_dma_handle_ch(int ch)
+{
+	u32 status = p->dma_read(CSR, ch);
+
+	if (!status) {
+		if (printk_ratelimit())
+			pr_warn("Spurious DMA IRQ for lch %d\n", ch);
+		p->dma_write(1 << ch, IRQSTATUS_L0, ch);
+		return 0;
+	}
+	if (unlikely(dma_chan[ch].dev_id == -1)) {
+		if (printk_ratelimit())
+			pr_warn("IRQ %04x for non-allocated DMA channel %d\n",
+				status, ch);
+		return 0;
+	}
+	if (unlikely(status & OMAP_DMA_DROP_IRQ))
+		pr_info("DMA synchronization event drop occurred with device %d\n",
+			dma_chan[ch].dev_id);
+	if (unlikely(status & OMAP2_DMA_TRANS_ERR_IRQ)) {
+		printk(KERN_INFO "DMA transaction error with device %d\n",
+		       dma_chan[ch].dev_id);
+		if (IS_DMA_ERRATA(DMA_ERRATA_i378)) {
+			u32 ccr;
+
+			ccr = p->dma_read(CCR, ch);
+			ccr &= ~OMAP_DMA_CCR_EN;
+			p->dma_write(ccr, CCR, ch);
+			dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
+		}
+	}
+	if (unlikely(status & OMAP2_DMA_SECURE_ERR_IRQ))
+		printk(KERN_INFO "DMA secure error with device %d\n",
+		       dma_chan[ch].dev_id);
+	if (unlikely(status & OMAP2_DMA_MISALIGNED_ERR_IRQ))
+		printk(KERN_INFO "DMA misaligned error with device %d\n",
+		       dma_chan[ch].dev_id);
+
+	p->dma_write(status, CSR, ch);
+	p->dma_write(1 << ch, IRQSTATUS_L0, ch);
+	/* read back the register to flush the write */
+	p->dma_read(IRQSTATUS_L0, ch);
+
+	/* If the ch is not chained then chain_id will be -1 */
+	if (dma_chan[ch].chain_id != -1) {
+		int chain_id = dma_chan[ch].chain_id;
+		dma_chan[ch].state = DMA_CH_NOTSTARTED;
+		if (p->dma_read(CLNK_CTRL, ch) & (1 << 15))
+			dma_chan[dma_chan[ch].next_linked_ch].state =
+							DMA_CH_STARTED;
+		if (dma_linked_lch[chain_id].chain_mode ==
+						OMAP_DMA_DYNAMIC_CHAIN)
+			disable_lnk(ch);
+
+		if (!OMAP_DMA_CHAIN_QEMPTY(chain_id))
+			OMAP_DMA_CHAIN_INCQHEAD(chain_id);
+
+		status = p->dma_read(CSR, ch);
+		p->dma_write(status, CSR, ch);
+	}
+
+	if (likely(dma_chan[ch].callback != NULL))
+		dma_chan[ch].callback(ch, status, dma_chan[ch].data);
+
+	return 0;
+}
+
+/* STATUS register count is from 1-32 while our is 0-31 */
+static irqreturn_t omap2_dma_irq_handler(int irq, void *dev_id)
+{
+	u32 val, enable_reg;
+	int i;
+
+	val = p->dma_read(IRQSTATUS_L0, 0);
+	if (val == 0) {
+		if (printk_ratelimit())
+			printk(KERN_WARNING "Spurious DMA IRQ\n");
+		return IRQ_HANDLED;
+	}
+	enable_reg = p->dma_read(IRQENABLE_L0, 0);
+	val &= enable_reg; /* Dispatch only relevant interrupts */
+	for (i = 0; i < dma_lch_count && val != 0; i++) {
+		if (val & 1)
+			omap2_dma_handle_ch(i);
+		val >>= 1;
+	}
+
+	return IRQ_HANDLED;
+}
+
+static struct irqaction omap24xx_dma_irq = {
+	.name = "DMA",
+	.handler = omap2_dma_irq_handler,
+};
+
+#else
+static struct irqaction omap24xx_dma_irq;
+#endif
+
+/*----------------------------------------------------------------------------*/
+
+/*
+ * Note that we are currently using only IRQENABLE_L0 and L1.
+ * As the DSP may be using IRQENABLE_L2 and L3, let's not
+ * touch those for now.
+ */
+void omap_dma_global_context_save(void)
+{
+	omap_dma_global_context.dma_irqenable_l0 =
+		p->dma_read(IRQENABLE_L0, 0);
+	omap_dma_global_context.dma_irqenable_l1 =
+		p->dma_read(IRQENABLE_L1, 0);
+	omap_dma_global_context.dma_ocp_sysconfig =
+		p->dma_read(OCP_SYSCONFIG, 0);
+	omap_dma_global_context.dma_gcr = p->dma_read(GCR, 0);
+}
+
+void omap_dma_global_context_restore(void)
+{
+	int ch;
+
+	p->dma_write(omap_dma_global_context.dma_gcr, GCR, 0);
+	p->dma_write(omap_dma_global_context.dma_ocp_sysconfig,
+		OCP_SYSCONFIG, 0);
+	p->dma_write(omap_dma_global_context.dma_irqenable_l0,
+		IRQENABLE_L0, 0);
+	p->dma_write(omap_dma_global_context.dma_irqenable_l1,
+		IRQENABLE_L1, 0);
+
+	if (IS_DMA_ERRATA(DMA_ROMCODE_BUG))
+		p->dma_write(0x3 , IRQSTATUS_L0, 0);
+
+	for (ch = 0; ch < dma_chan_count; ch++)
+		if (dma_chan[ch].dev_id != -1)
+			omap_clear_dma(ch);
+}
+
+struct omap_system_dma_plat_info *omap_get_plat_info(void)
+{
+	return p;
+}
+EXPORT_SYMBOL_GPL(omap_get_plat_info);
+
+static int omap_system_dma_probe(struct platform_device *pdev)
+{
+	int ch, ret = 0;
+	int dma_irq;
+	char irq_name[4];
+	int irq_rel;
+
+	p = pdev->dev.platform_data;
+	if (!p) {
+		dev_err(&pdev->dev,
+			"%s: System DMA initialized without platform data\n",
+			__func__);
+		return -EINVAL;
+	}
+
+	d			= p->dma_attr;
+	errata			= p->errata;
+
+	if ((d->dev_caps & RESERVE_CHANNEL) && omap_dma_reserve_channels
+			&& (omap_dma_reserve_channels < d->lch_count))
+		d->lch_count	= omap_dma_reserve_channels;
+
+	dma_lch_count		= d->lch_count;
+	dma_chan_count		= dma_lch_count;
+	enable_1510_mode	= d->dev_caps & ENABLE_1510_MODE;
+
+	dma_chan = devm_kcalloc(&pdev->dev, dma_lch_count,
+				sizeof(struct omap_dma_lch), GFP_KERNEL);
+	if (!dma_chan) {
+		dev_err(&pdev->dev, "%s: kzalloc fail\n", __func__);
+		return -ENOMEM;
+	}
+
+
+	if (dma_omap2plus()) {
+		dma_linked_lch = kzalloc(sizeof(struct dma_link_info) *
+						dma_lch_count, GFP_KERNEL);
+		if (!dma_linked_lch) {
+			ret = -ENOMEM;
+			goto exit_dma_lch_fail;
+		}
+	}
+
+	spin_lock_init(&dma_chan_lock);
+	for (ch = 0; ch < dma_chan_count; ch++) {
+		omap_clear_dma(ch);
+		if (dma_omap2plus())
+			omap2_disable_irq_lch(ch);
+
+		dma_chan[ch].dev_id = -1;
+		dma_chan[ch].next_lch = -1;
+
+		if (ch >= 6 && enable_1510_mode)
+			continue;
+
+		if (dma_omap1()) {
+			/*
+			 * request_irq() doesn't like dev_id (ie. ch) being
+			 * zero, so we have to kludge around this.
+			 */
+			sprintf(&irq_name[0], "%d", ch);
+			dma_irq = platform_get_irq_byname(pdev, irq_name);
+
+			if (dma_irq < 0) {
+				ret = dma_irq;
+				goto exit_dma_irq_fail;
+			}
+
+			/* INT_DMA_LCD is handled in lcd_dma.c */
+			if (dma_irq == INT_DMA_LCD)
+				continue;
+
+			ret = request_irq(dma_irq,
+					omap1_dma_irq_handler, 0, "DMA",
+					(void *) (ch + 1));
+			if (ret != 0)
+				goto exit_dma_irq_fail;
+		}
+	}
+
+	if (d->dev_caps & IS_RW_PRIORITY)
+		omap_dma_set_global_params(DMA_DEFAULT_ARB_RATE,
+				DMA_DEFAULT_FIFO_DEPTH, 0);
+
+	if (dma_omap2plus() && !(d->dev_caps & DMA_ENGINE_HANDLE_IRQ)) {
+		strcpy(irq_name, "0");
+		dma_irq = platform_get_irq_byname(pdev, irq_name);
+		if (dma_irq < 0) {
+			dev_err(&pdev->dev, "failed: request IRQ %d", dma_irq);
+			ret = dma_irq;
+			goto exit_dma_lch_fail;
+		}
+		ret = setup_irq(dma_irq, &omap24xx_dma_irq);
+		if (ret) {
+			dev_err(&pdev->dev, "set_up failed for IRQ %d for DMA (error %d)\n",
+				dma_irq, ret);
+			goto exit_dma_lch_fail;
+		}
+	}
+
+	/* reserve dma channels 0 and 1 in high security devices on 34xx */
+	if (d->dev_caps & HS_CHANNELS_RESERVED) {
+		pr_info("Reserving DMA channels 0 and 1 for HS ROM code\n");
+		dma_chan[0].dev_id = 0;
+		dma_chan[1].dev_id = 1;
+	}
+	p->show_dma_caps();
+	return 0;
+
+exit_dma_irq_fail:
+	dev_err(&pdev->dev, "unable to request IRQ %d for DMA (error %d)\n",
+		dma_irq, ret);
+	for (irq_rel = 0; irq_rel < ch;	irq_rel++) {
+		dma_irq = platform_get_irq(pdev, irq_rel);
+		free_irq(dma_irq, (void *)(irq_rel + 1));
+	}
+
+exit_dma_lch_fail:
+	return ret;
+}
+
+static int omap_system_dma_remove(struct platform_device *pdev)
+{
+	int dma_irq;
+
+	if (dma_omap2plus()) {
+		char irq_name[4];
+		strcpy(irq_name, "0");
+		dma_irq = platform_get_irq_byname(pdev, irq_name);
+		if (dma_irq >= 0)
+			remove_irq(dma_irq, &omap24xx_dma_irq);
+	} else {
+		int irq_rel = 0;
+		for ( ; irq_rel < dma_chan_count; irq_rel++) {
+			dma_irq = platform_get_irq(pdev, irq_rel);
+			free_irq(dma_irq, (void *)(irq_rel + 1));
+		}
+	}
+	return 0;
+}
+
+static struct platform_driver omap_system_dma_driver = {
+	.probe		= omap_system_dma_probe,
+	.remove		= omap_system_dma_remove,
+	.driver		= {
+		.name	= "omap_dma_system"
+	},
+};
+
+static int __init omap_system_dma_init(void)
+{
+	return platform_driver_register(&omap_system_dma_driver);
+}
+arch_initcall(omap_system_dma_init);
+
+static void __exit omap_system_dma_exit(void)
+{
+	platform_driver_unregister(&omap_system_dma_driver);
+}
+
+MODULE_DESCRIPTION("OMAP SYSTEM DMA DRIVER");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRIVER_NAME);
+MODULE_AUTHOR("Texas Instruments Inc");
+
+/*
+ * Reserve the omap SDMA channels using cmdline bootarg
+ * "omap_dma_reserve_ch=". The valid range is 1 to 32
+ */
+static int __init omap_dma_cmdline_reserve_ch(char *str)
+{
+	if (get_option(&str, &omap_dma_reserve_channels) != 1)
+		omap_dma_reserve_channels = 0;
+	return 1;
+}
+
+__setup("omap_dma_reserve_ch=", omap_dma_cmdline_reserve_ch);
+
+
diff --git a/kernel/arch/arm/plat-omap/dmtimer.c b/kernel/arch/arm/plat-omap/dmtimer.c
new file mode 100644
index 000000000..8ca94d379
--- /dev/null
+++ b/kernel/arch/arm/plat-omap/dmtimer.c
@@ -0,0 +1,965 @@
+/*
+ * linux/arch/arm/plat-omap/dmtimer.c
+ *
+ * OMAP Dual-Mode Timers
+ *
+ * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
+ * Tarun Kanti DebBarma <tarun.kanti@ti.com>
+ * Thara Gopinath <thara@ti.com>
+ *
+ * dmtimer adaptation to platform_driver.
+ *
+ * Copyright (C) 2005 Nokia Corporation
+ * OMAP2 support by Juha Yrjola
+ * API improvements and OMAP2 clock framework support by Timo Teras
+ *
+ * Copyright (C) 2009 Texas Instruments
+ * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
+ *
+ * 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+ * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * 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/clk.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/pm_runtime.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/platform_data/dmtimer-omap.h>
+
+#include <plat/dmtimer.h>
+
+static u32 omap_reserved_systimers;
+static LIST_HEAD(omap_timer_list);
+static DEFINE_SPINLOCK(dm_timer_lock);
+
+enum {
+	REQUEST_ANY = 0,
+	REQUEST_BY_ID,
+	REQUEST_BY_CAP,
+	REQUEST_BY_NODE,
+};
+
+/**
+ * omap_dm_timer_read_reg - read timer registers in posted and non-posted mode
+ * @timer:      timer pointer over which read operation to perform
+ * @reg:        lowest byte holds the register offset
+ *
+ * The posted mode bit is encoded in reg. Note that in posted mode write
+ * pending bit must be checked. Otherwise a read of a non completed write
+ * will produce an error.
+ */
+static inline u32 omap_dm_timer_read_reg(struct omap_dm_timer *timer, u32 reg)
+{
+	WARN_ON((reg & 0xff) < _OMAP_TIMER_WAKEUP_EN_OFFSET);
+	return __omap_dm_timer_read(timer, reg, timer->posted);
+}
+
+/**
+ * omap_dm_timer_write_reg - write timer registers in posted and non-posted mode
+ * @timer:      timer pointer over which write operation is to perform
+ * @reg:        lowest byte holds the register offset
+ * @value:      data to write into the register
+ *
+ * The posted mode bit is encoded in reg. Note that in posted mode the write
+ * pending bit must be checked. Otherwise a write on a register which has a
+ * pending write will be lost.
+ */
+static void omap_dm_timer_write_reg(struct omap_dm_timer *timer, u32 reg,
+						u32 value)
+{
+	WARN_ON((reg & 0xff) < _OMAP_TIMER_WAKEUP_EN_OFFSET);
+	__omap_dm_timer_write(timer, reg, value, timer->posted);
+}
+
+static void omap_timer_restore_context(struct omap_dm_timer *timer)
+{
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_WAKEUP_EN_REG,
+				timer->context.twer);
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG,
+				timer->context.tcrr);
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG,
+				timer->context.tldr);
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_MATCH_REG,
+				timer->context.tmar);
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG,
+				timer->context.tsicr);
+	writel_relaxed(timer->context.tier, timer->irq_ena);
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG,
+				timer->context.tclr);
+}
+
+static int omap_dm_timer_reset(struct omap_dm_timer *timer)
+{
+	u32 l, timeout = 100000;
+
+	if (timer->revision != 1)
+		return -EINVAL;
+
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG, 0x06);
+
+	do {
+		l = __omap_dm_timer_read(timer,
+					 OMAP_TIMER_V1_SYS_STAT_OFFSET, 0);
+	} while (!l && timeout--);
+
+	if (!timeout) {
+		dev_err(&timer->pdev->dev, "Timer failed to reset\n");
+		return -ETIMEDOUT;
+	}
+
+	/* Configure timer for smart-idle mode */
+	l = __omap_dm_timer_read(timer, OMAP_TIMER_OCP_CFG_OFFSET, 0);
+	l |= 0x2 << 0x3;
+	__omap_dm_timer_write(timer, OMAP_TIMER_OCP_CFG_OFFSET, l, 0);
+
+	timer->posted = 0;
+
+	return 0;
+}
+
+static int omap_dm_timer_prepare(struct omap_dm_timer *timer)
+{
+	int rc;
+
+	/*
+	 * FIXME: OMAP1 devices do not use the clock framework for dmtimers so
+	 * do not call clk_get() for these devices.
+	 */
+	if (!(timer->capability & OMAP_TIMER_NEEDS_RESET)) {
+		timer->fclk = clk_get(&timer->pdev->dev, "fck");
+		if (WARN_ON_ONCE(IS_ERR(timer->fclk))) {
+			dev_err(&timer->pdev->dev, ": No fclk handle.\n");
+			return -EINVAL;
+		}
+	}
+
+	omap_dm_timer_enable(timer);
+
+	if (timer->capability & OMAP_TIMER_NEEDS_RESET) {
+		rc = omap_dm_timer_reset(timer);
+		if (rc) {
+			omap_dm_timer_disable(timer);
+			return rc;
+		}
+	}
+
+	__omap_dm_timer_enable_posted(timer);
+	omap_dm_timer_disable(timer);
+
+	return omap_dm_timer_set_source(timer, OMAP_TIMER_SRC_32_KHZ);
+}
+
+static inline u32 omap_dm_timer_reserved_systimer(int id)
+{
+	return (omap_reserved_systimers & (1 << (id - 1))) ? 1 : 0;
+}
+
+int omap_dm_timer_reserve_systimer(int id)
+{
+	if (omap_dm_timer_reserved_systimer(id))
+		return -ENODEV;
+
+	omap_reserved_systimers |= (1 << (id - 1));
+
+	return 0;
+}
+
+static struct omap_dm_timer *_omap_dm_timer_request(int req_type, void *data)
+{
+	struct omap_dm_timer *timer = NULL, *t;
+	struct device_node *np = NULL;
+	unsigned long flags;
+	u32 cap = 0;
+	int id = 0;
+
+	switch (req_type) {
+	case REQUEST_BY_ID:
+		id = *(int *)data;
+		break;
+	case REQUEST_BY_CAP:
+		cap = *(u32 *)data;
+		break;
+	case REQUEST_BY_NODE:
+		np = (struct device_node *)data;
+		break;
+	default:
+		/* REQUEST_ANY */
+		break;
+	}
+
+	spin_lock_irqsave(&dm_timer_lock, flags);
+	list_for_each_entry(t, &omap_timer_list, node) {
+		if (t->reserved)
+			continue;
+
+		switch (req_type) {
+		case REQUEST_BY_ID:
+			if (id == t->pdev->id) {
+				timer = t;
+				timer->reserved = 1;
+				goto found;
+			}
+			break;
+		case REQUEST_BY_CAP:
+			if (cap == (t->capability & cap)) {
+				/*
+				 * If timer is not NULL, we have already found
+				 * one timer but it was not an exact match
+				 * because it had more capabilites that what
+				 * was required. Therefore, unreserve the last
+				 * timer found and see if this one is a better
+				 * match.
+				 */
+				if (timer)
+					timer->reserved = 0;
+				timer = t;
+				timer->reserved = 1;
+
+				/* Exit loop early if we find an exact match */
+				if (t->capability == cap)
+					goto found;
+			}
+			break;
+		case REQUEST_BY_NODE:
+			if (np == t->pdev->dev.of_node) {
+				timer = t;
+				timer->reserved = 1;
+				goto found;
+			}
+			break;
+		default:
+			/* REQUEST_ANY */
+			timer = t;
+			timer->reserved = 1;
+			goto found;
+		}
+	}
+found:
+	spin_unlock_irqrestore(&dm_timer_lock, flags);
+
+	if (timer && omap_dm_timer_prepare(timer)) {
+		timer->reserved = 0;
+		timer = NULL;
+	}
+
+	if (!timer)
+		pr_debug("%s: timer request failed!\n", __func__);
+
+	return timer;
+}
+
+struct omap_dm_timer *omap_dm_timer_request(void)
+{
+	return _omap_dm_timer_request(REQUEST_ANY, NULL);
+}
+EXPORT_SYMBOL_GPL(omap_dm_timer_request);
+
+struct omap_dm_timer *omap_dm_timer_request_specific(int id)
+{
+	/* Requesting timer by ID is not supported when device tree is used */
+	if (of_have_populated_dt()) {
+		pr_warn("%s: Please use omap_dm_timer_request_by_cap/node()\n",
+			__func__);
+		return NULL;
+	}
+
+	return _omap_dm_timer_request(REQUEST_BY_ID, &id);
+}
+EXPORT_SYMBOL_GPL(omap_dm_timer_request_specific);
+
+/**
+ * omap_dm_timer_request_by_cap - Request a timer by capability
+ * @cap:	Bit mask of capabilities to match
+ *
+ * Find a timer based upon capabilities bit mask. Callers of this function
+ * should use the definitions found in the plat/dmtimer.h file under the
+ * comment "timer capabilities used in hwmod database". Returns pointer to
+ * timer handle on success and a NULL pointer on failure.
+ */
+struct omap_dm_timer *omap_dm_timer_request_by_cap(u32 cap)
+{
+	return _omap_dm_timer_request(REQUEST_BY_CAP, &cap);
+}
+EXPORT_SYMBOL_GPL(omap_dm_timer_request_by_cap);
+
+/**
+ * omap_dm_timer_request_by_node - Request a timer by device-tree node
+ * @np:		Pointer to device-tree timer node
+ *
+ * Request a timer based upon a device node pointer. Returns pointer to
+ * timer handle on success and a NULL pointer on failure.
+ */
+struct omap_dm_timer *omap_dm_timer_request_by_node(struct device_node *np)
+{
+	if (!np)
+		return NULL;
+
+	return _omap_dm_timer_request(REQUEST_BY_NODE, np);
+}
+EXPORT_SYMBOL_GPL(omap_dm_timer_request_by_node);
+
+int omap_dm_timer_free(struct omap_dm_timer *timer)
+{
+	if (unlikely(!timer))
+		return -EINVAL;
+
+	clk_put(timer->fclk);
+
+	WARN_ON(!timer->reserved);
+	timer->reserved = 0;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(omap_dm_timer_free);
+
+void omap_dm_timer_enable(struct omap_dm_timer *timer)
+{
+	int c;
+
+	pm_runtime_get_sync(&timer->pdev->dev);
+
+	if (!(timer->capability & OMAP_TIMER_ALWON)) {
+		if (timer->get_context_loss_count) {
+			c = timer->get_context_loss_count(&timer->pdev->dev);
+			if (c != timer->ctx_loss_count) {
+				omap_timer_restore_context(timer);
+				timer->ctx_loss_count = c;
+			}
+		} else {
+			omap_timer_restore_context(timer);
+		}
+	}
+}
+EXPORT_SYMBOL_GPL(omap_dm_timer_enable);
+
+void omap_dm_timer_disable(struct omap_dm_timer *timer)
+{
+	pm_runtime_put_sync(&timer->pdev->dev);
+}
+EXPORT_SYMBOL_GPL(omap_dm_timer_disable);
+
+int omap_dm_timer_get_irq(struct omap_dm_timer *timer)
+{
+	if (timer)
+		return timer->irq;
+	return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(omap_dm_timer_get_irq);
+
+#if defined(CONFIG_ARCH_OMAP1)
+#include <mach/hardware.h>
+/**
+ * omap_dm_timer_modify_idlect_mask - Check if any running timers use ARMXOR
+ * @inputmask: current value of idlect mask
+ */
+__u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask)
+{
+	int i = 0;
+	struct omap_dm_timer *timer = NULL;
+	unsigned long flags;
+
+	/* If ARMXOR cannot be idled this function call is unnecessary */
+	if (!(inputmask & (1 << 1)))
+		return inputmask;
+
+	/* If any active timer is using ARMXOR return modified mask */
+	spin_lock_irqsave(&dm_timer_lock, flags);
+	list_for_each_entry(timer, &omap_timer_list, node) {
+		u32 l;
+
+		l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
+		if (l & OMAP_TIMER_CTRL_ST) {
+			if (((omap_readl(MOD_CONF_CTRL_1) >> (i * 2)) & 0x03) == 0)
+				inputmask &= ~(1 << 1);
+			else
+				inputmask &= ~(1 << 2);
+		}
+		i++;
+	}
+	spin_unlock_irqrestore(&dm_timer_lock, flags);
+
+	return inputmask;
+}
+EXPORT_SYMBOL_GPL(omap_dm_timer_modify_idlect_mask);
+
+#else
+
+struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *timer)
+{
+	if (timer && !IS_ERR(timer->fclk))
+		return timer->fclk;
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(omap_dm_timer_get_fclk);
+
+__u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask)
+{
+	BUG();
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(omap_dm_timer_modify_idlect_mask);
+
+#endif
+
+int omap_dm_timer_trigger(struct omap_dm_timer *timer)
+{
+	if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev))) {
+		pr_err("%s: timer not available or enabled.\n", __func__);
+		return -EINVAL;
+	}
+
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(omap_dm_timer_trigger);
+
+int omap_dm_timer_start(struct omap_dm_timer *timer)
+{
+	u32 l;
+
+	if (unlikely(!timer))
+		return -EINVAL;
+
+	omap_dm_timer_enable(timer);
+
+	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
+	if (!(l & OMAP_TIMER_CTRL_ST)) {
+		l |= OMAP_TIMER_CTRL_ST;
+		omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
+	}
+
+	/* Save the context */
+	timer->context.tclr = l;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(omap_dm_timer_start);
+
+int omap_dm_timer_stop(struct omap_dm_timer *timer)
+{
+	unsigned long rate = 0;
+
+	if (unlikely(!timer))
+		return -EINVAL;
+
+	if (!(timer->capability & OMAP_TIMER_NEEDS_RESET))
+		rate = clk_get_rate(timer->fclk);
+
+	__omap_dm_timer_stop(timer, timer->posted, rate);
+
+	/*
+	 * Since the register values are computed and written within
+	 * __omap_dm_timer_stop, we need to use read to retrieve the
+	 * context.
+	 */
+	timer->context.tclr =
+			omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
+	omap_dm_timer_disable(timer);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(omap_dm_timer_stop);
+
+int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
+{
+	int ret;
+	char *parent_name = NULL;
+	struct clk *parent;
+	struct dmtimer_platform_data *pdata;
+
+	if (unlikely(!timer))
+		return -EINVAL;
+
+	pdata = timer->pdev->dev.platform_data;
+
+	if (source < 0 || source >= 3)
+		return -EINVAL;
+
+	/*
+	 * FIXME: Used for OMAP1 devices only because they do not currently
+	 * use the clock framework to set the parent clock. To be removed
+	 * once OMAP1 migrated to using clock framework for dmtimers
+	 */
+	if (pdata && pdata->set_timer_src)
+		return pdata->set_timer_src(timer->pdev, source);
+
+	if (IS_ERR(timer->fclk))
+		return -EINVAL;
+
+	switch (source) {
+	case OMAP_TIMER_SRC_SYS_CLK:
+		parent_name = "timer_sys_ck";
+		break;
+
+	case OMAP_TIMER_SRC_32_KHZ:
+		parent_name = "timer_32k_ck";
+		break;
+
+	case OMAP_TIMER_SRC_EXT_CLK:
+		parent_name = "timer_ext_ck";
+		break;
+	}
+
+	parent = clk_get(&timer->pdev->dev, parent_name);
+	if (IS_ERR(parent)) {
+		pr_err("%s: %s not found\n", __func__, parent_name);
+		return -EINVAL;
+	}
+
+	ret = clk_set_parent(timer->fclk, parent);
+	if (ret < 0)
+		pr_err("%s: failed to set %s as parent\n", __func__,
+			parent_name);
+
+	clk_put(parent);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(omap_dm_timer_set_source);
+
+int omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload,
+			    unsigned int load)
+{
+	u32 l;
+
+	if (unlikely(!timer))
+		return -EINVAL;
+
+	omap_dm_timer_enable(timer);
+	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
+	if (autoreload)
+		l |= OMAP_TIMER_CTRL_AR;
+	else
+		l &= ~OMAP_TIMER_CTRL_AR;
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG, load);
+
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0);
+	/* Save the context */
+	timer->context.tclr = l;
+	timer->context.tldr = load;
+	omap_dm_timer_disable(timer);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(omap_dm_timer_set_load);
+
+/* Optimized set_load which removes costly spin wait in timer_start */
+int omap_dm_timer_set_load_start(struct omap_dm_timer *timer, int autoreload,
+                            unsigned int load)
+{
+	u32 l;
+
+	if (unlikely(!timer))
+		return -EINVAL;
+
+	omap_dm_timer_enable(timer);
+
+	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
+	if (autoreload) {
+		l |= OMAP_TIMER_CTRL_AR;
+		omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG, load);
+	} else {
+		l &= ~OMAP_TIMER_CTRL_AR;
+	}
+	l |= OMAP_TIMER_CTRL_ST;
+
+	__omap_dm_timer_load_start(timer, l, load, timer->posted);
+
+	/* Save the context */
+	timer->context.tclr = l;
+	timer->context.tldr = load;
+	timer->context.tcrr = load;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(omap_dm_timer_set_load_start);
+
+int omap_dm_timer_set_match(struct omap_dm_timer *timer, int enable,
+			     unsigned int match)
+{
+	u32 l;
+
+	if (unlikely(!timer))
+		return -EINVAL;
+
+	omap_dm_timer_enable(timer);
+	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
+	if (enable)
+		l |= OMAP_TIMER_CTRL_CE;
+	else
+		l &= ~OMAP_TIMER_CTRL_CE;
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_MATCH_REG, match);
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
+
+	/* Save the context */
+	timer->context.tclr = l;
+	timer->context.tmar = match;
+	omap_dm_timer_disable(timer);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(omap_dm_timer_set_match);
+
+int omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on,
+			   int toggle, int trigger)
+{
+	u32 l;
+
+	if (unlikely(!timer))
+		return -EINVAL;
+
+	omap_dm_timer_enable(timer);
+	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
+	l &= ~(OMAP_TIMER_CTRL_GPOCFG | OMAP_TIMER_CTRL_SCPWM |
+	       OMAP_TIMER_CTRL_PT | (0x03 << 10));
+	if (def_on)
+		l |= OMAP_TIMER_CTRL_SCPWM;
+	if (toggle)
+		l |= OMAP_TIMER_CTRL_PT;
+	l |= trigger << 10;
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
+
+	/* Save the context */
+	timer->context.tclr = l;
+	omap_dm_timer_disable(timer);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(omap_dm_timer_set_pwm);
+
+int omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler)
+{
+	u32 l;
+
+	if (unlikely(!timer))
+		return -EINVAL;
+
+	omap_dm_timer_enable(timer);
+	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
+	l &= ~(OMAP_TIMER_CTRL_PRE | (0x07 << 2));
+	if (prescaler >= 0x00 && prescaler <= 0x07) {
+		l |= OMAP_TIMER_CTRL_PRE;
+		l |= prescaler << 2;
+	}
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
+
+	/* Save the context */
+	timer->context.tclr = l;
+	omap_dm_timer_disable(timer);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(omap_dm_timer_set_prescaler);
+
+int omap_dm_timer_set_int_enable(struct omap_dm_timer *timer,
+				  unsigned int value)
+{
+	if (unlikely(!timer))
+		return -EINVAL;
+
+	omap_dm_timer_enable(timer);
+	__omap_dm_timer_int_enable(timer, value);
+
+	/* Save the context */
+	timer->context.tier = value;
+	timer->context.twer = value;
+	omap_dm_timer_disable(timer);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(omap_dm_timer_set_int_enable);
+
+/**
+ * omap_dm_timer_set_int_disable - disable timer interrupts
+ * @timer:	pointer to timer handle
+ * @mask:	bit mask of interrupts to be disabled
+ *
+ * Disables the specified timer interrupts for a timer.
+ */
+int omap_dm_timer_set_int_disable(struct omap_dm_timer *timer, u32 mask)
+{
+	u32 l = mask;
+
+	if (unlikely(!timer))
+		return -EINVAL;
+
+	omap_dm_timer_enable(timer);
+
+	if (timer->revision == 1)
+		l = readl_relaxed(timer->irq_ena) & ~mask;
+
+	writel_relaxed(l, timer->irq_dis);
+	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_WAKEUP_EN_REG) & ~mask;
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_WAKEUP_EN_REG, l);
+
+	/* Save the context */
+	timer->context.tier &= ~mask;
+	timer->context.twer &= ~mask;
+	omap_dm_timer_disable(timer);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(omap_dm_timer_set_int_disable);
+
+unsigned int omap_dm_timer_read_status(struct omap_dm_timer *timer)
+{
+	unsigned int l;
+
+	if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev))) {
+		pr_err("%s: timer not available or enabled.\n", __func__);
+		return 0;
+	}
+
+	l = readl_relaxed(timer->irq_stat);
+
+	return l;
+}
+EXPORT_SYMBOL_GPL(omap_dm_timer_read_status);
+
+int omap_dm_timer_write_status(struct omap_dm_timer *timer, unsigned int value)
+{
+	if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev)))
+		return -EINVAL;
+
+	__omap_dm_timer_write_status(timer, value);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(omap_dm_timer_write_status);
+
+unsigned int omap_dm_timer_read_counter(struct omap_dm_timer *timer)
+{
+	if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev))) {
+		pr_err("%s: timer not iavailable or enabled.\n", __func__);
+		return 0;
+	}
+
+	return __omap_dm_timer_read_counter(timer, timer->posted);
+}
+EXPORT_SYMBOL_GPL(omap_dm_timer_read_counter);
+
+int omap_dm_timer_write_counter(struct omap_dm_timer *timer, unsigned int value)
+{
+	if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev))) {
+		pr_err("%s: timer not available or enabled.\n", __func__);
+		return -EINVAL;
+	}
+
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG, value);
+
+	/* Save the context */
+	timer->context.tcrr = value;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(omap_dm_timer_write_counter);
+
+int omap_dm_timers_active(void)
+{
+	struct omap_dm_timer *timer;
+
+	list_for_each_entry(timer, &omap_timer_list, node) {
+		if (!timer->reserved)
+			continue;
+
+		if (omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG) &
+		    OMAP_TIMER_CTRL_ST) {
+			return 1;
+		}
+	}
+	return 0;
+}
+EXPORT_SYMBOL_GPL(omap_dm_timers_active);
+
+static const struct of_device_id omap_timer_match[];
+
+/**
+ * omap_dm_timer_probe - probe function called for every registered device
+ * @pdev:	pointer to current timer platform device
+ *
+ * Called by driver framework at the end of device registration for all
+ * timer devices.
+ */
+static int omap_dm_timer_probe(struct platform_device *pdev)
+{
+	unsigned long flags;
+	struct omap_dm_timer *timer;
+	struct resource *mem, *irq;
+	struct device *dev = &pdev->dev;
+	const struct of_device_id *match;
+	const struct dmtimer_platform_data *pdata;
+	int ret;
+
+	match = of_match_device(of_match_ptr(omap_timer_match), dev);
+	pdata = match ? match->data : dev->platform_data;
+
+	if (!pdata && !dev->of_node) {
+		dev_err(dev, "%s: no platform data.\n", __func__);
+		return -ENODEV;
+	}
+
+	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	if (unlikely(!irq)) {
+		dev_err(dev, "%s: no IRQ resource.\n", __func__);
+		return -ENODEV;
+	}
+
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (unlikely(!mem)) {
+		dev_err(dev, "%s: no memory resource.\n", __func__);
+		return -ENODEV;
+	}
+
+	timer = devm_kzalloc(dev, sizeof(struct omap_dm_timer), GFP_KERNEL);
+	if (!timer) {
+		dev_err(dev, "%s: memory alloc failed!\n", __func__);
+		return  -ENOMEM;
+	}
+
+	timer->fclk = ERR_PTR(-ENODEV);
+	timer->io_base = devm_ioremap_resource(dev, mem);
+	if (IS_ERR(timer->io_base))
+		return PTR_ERR(timer->io_base);
+
+	if (dev->of_node) {
+		if (of_find_property(dev->of_node, "ti,timer-alwon", NULL))
+			timer->capability |= OMAP_TIMER_ALWON;
+		if (of_find_property(dev->of_node, "ti,timer-dsp", NULL))
+			timer->capability |= OMAP_TIMER_HAS_DSP_IRQ;
+		if (of_find_property(dev->of_node, "ti,timer-pwm", NULL))
+			timer->capability |= OMAP_TIMER_HAS_PWM;
+		if (of_find_property(dev->of_node, "ti,timer-secure", NULL))
+			timer->capability |= OMAP_TIMER_SECURE;
+	} else {
+		timer->id = pdev->id;
+		timer->capability = pdata->timer_capability;
+		timer->reserved = omap_dm_timer_reserved_systimer(timer->id);
+		timer->get_context_loss_count = pdata->get_context_loss_count;
+	}
+
+	if (pdata)
+		timer->errata = pdata->timer_errata;
+
+	timer->irq = irq->start;
+	timer->pdev = pdev;
+
+	/* Skip pm_runtime_enable for OMAP1 */
+	if (!(timer->capability & OMAP_TIMER_NEEDS_RESET)) {
+		pm_runtime_enable(dev);
+		pm_runtime_irq_safe(dev);
+	}
+
+	if (!timer->reserved) {
+		ret = pm_runtime_get_sync(dev);
+		if (ret < 0) {
+			dev_err(dev, "%s: pm_runtime_get_sync failed!\n",
+				__func__);
+			goto err_get_sync;
+		}
+		__omap_dm_timer_init_regs(timer);
+		pm_runtime_put(dev);
+	}
+
+	/* add the timer element to the list */
+	spin_lock_irqsave(&dm_timer_lock, flags);
+	list_add_tail(&timer->node, &omap_timer_list);
+	spin_unlock_irqrestore(&dm_timer_lock, flags);
+
+	dev_dbg(dev, "Device Probed.\n");
+
+	return 0;
+
+err_get_sync:
+	pm_runtime_put_noidle(dev);
+	pm_runtime_disable(dev);
+	return ret;
+}
+
+/**
+ * omap_dm_timer_remove - cleanup a registered timer device
+ * @pdev:	pointer to current timer platform device
+ *
+ * Called by driver framework whenever a timer device is unregistered.
+ * In addition to freeing platform resources it also deletes the timer
+ * entry from the local list.
+ */
+static int omap_dm_timer_remove(struct platform_device *pdev)
+{
+	struct omap_dm_timer *timer;
+	unsigned long flags;
+	int ret = -EINVAL;
+
+	spin_lock_irqsave(&dm_timer_lock, flags);
+	list_for_each_entry(timer, &omap_timer_list, node)
+		if (!strcmp(dev_name(&timer->pdev->dev),
+			    dev_name(&pdev->dev))) {
+			list_del(&timer->node);
+			ret = 0;
+			break;
+		}
+	spin_unlock_irqrestore(&dm_timer_lock, flags);
+
+	pm_runtime_disable(&pdev->dev);
+
+	return ret;
+}
+
+static const struct dmtimer_platform_data omap3plus_pdata = {
+	.timer_errata = OMAP_TIMER_ERRATA_I103_I767,
+};
+
+static const struct of_device_id omap_timer_match[] = {
+	{
+		.compatible = "ti,omap2420-timer",
+	},
+	{
+		.compatible = "ti,omap3430-timer",
+		.data = &omap3plus_pdata,
+	},
+	{
+		.compatible = "ti,omap4430-timer",
+		.data = &omap3plus_pdata,
+	},
+	{
+		.compatible = "ti,omap5430-timer",
+		.data = &omap3plus_pdata,
+	},
+	{
+		.compatible = "ti,am335x-timer",
+		.data = &omap3plus_pdata,
+	},
+	{
+		.compatible = "ti,am335x-timer-1ms",
+		.data = &omap3plus_pdata,
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(of, omap_timer_match);
+
+static struct platform_driver omap_dm_timer_driver = {
+	.probe  = omap_dm_timer_probe,
+	.remove = omap_dm_timer_remove,
+	.driver = {
+		.name   = "omap_timer",
+		.of_match_table = of_match_ptr(omap_timer_match),
+	},
+};
+
+early_platform_init("earlytimer", &omap_dm_timer_driver);
+module_platform_driver(omap_dm_timer_driver);
+
+MODULE_DESCRIPTION("OMAP Dual-Mode Timer Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRIVER_NAME);
+MODULE_AUTHOR("Texas Instruments Inc");
diff --git a/kernel/arch/arm/plat-omap/i2c.c b/kernel/arch/arm/plat-omap/i2c.c
new file mode 100644
index 000000000..58213d971
--- /dev/null
+++ b/kernel/arch/arm/plat-omap/i2c.c
@@ -0,0 +1,116 @@
+/*
+ * linux/arch/arm/plat-omap/i2c.c
+ *
+ * Helper module for board specific I2C bus registration
+ *
+ * Copyright (C) 2007 Nokia Corporation.
+ *
+ * Contact: Jarkko Nikula <jhnikula@gmail.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.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/i2c.h>
+#include <linux/i2c-omap.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+
+#include <plat/i2c.h>
+
+#define OMAP_I2C_MAX_CONTROLLERS 4
+static struct omap_i2c_bus_platform_data i2c_pdata[OMAP_I2C_MAX_CONTROLLERS];
+
+#define OMAP_I2C_CMDLINE_SETUP	(BIT(31))
+
+/**
+ * omap_i2c_bus_setup - Process command line options for the I2C bus speed
+ * @str: String of options
+ *
+ * This function allow to override the default I2C bus speed for given I2C
+ * bus with a command line option.
+ *
+ * Format: i2c_bus=bus_id,clkrate (in kHz)
+ *
+ * Returns 1 on success, 0 otherwise.
+ */
+static int __init omap_i2c_bus_setup(char *str)
+{
+	int ints[3];
+
+	get_options(str, 3, ints);
+	if (ints[0] < 2 || ints[1] < 1 ||
+			ints[1] > OMAP_I2C_MAX_CONTROLLERS)
+		return 0;
+	i2c_pdata[ints[1] - 1].clkrate = ints[2];
+	i2c_pdata[ints[1] - 1].clkrate |= OMAP_I2C_CMDLINE_SETUP;
+
+	return 1;
+}
+__setup("i2c_bus=", omap_i2c_bus_setup);
+
+/*
+ * Register busses defined in command line but that are not registered with
+ * omap_register_i2c_bus from board initialization code.
+ */
+int __init omap_register_i2c_bus_cmdline(void)
+{
+	int i, err = 0;
+
+	for (i = 0; i < ARRAY_SIZE(i2c_pdata); i++)
+		if (i2c_pdata[i].clkrate & OMAP_I2C_CMDLINE_SETUP) {
+			i2c_pdata[i].clkrate &= ~OMAP_I2C_CMDLINE_SETUP;
+			err = omap_i2c_add_bus(&i2c_pdata[i], i + 1);
+			if (err)
+				goto out;
+		}
+
+out:
+	return err;
+}
+
+/**
+ * omap_register_i2c_bus - register I2C bus with device descriptors
+ * @bus_id: bus id counting from number 1
+ * @clkrate: clock rate of the bus in kHz
+ * @info: pointer into I2C device descriptor table or NULL
+ * @len: number of descriptors in the table
+ *
+ * Returns 0 on success or an error code.
+ */
+int __init omap_register_i2c_bus(int bus_id, u32 clkrate,
+			  struct i2c_board_info const *info,
+			  unsigned len)
+{
+	int err;
+
+	BUG_ON(bus_id < 1 || bus_id > OMAP_I2C_MAX_CONTROLLERS);
+
+	if (info) {
+		err = i2c_register_board_info(bus_id, info, len);
+		if (err)
+			return err;
+	}
+
+	if (!i2c_pdata[bus_id - 1].clkrate)
+		i2c_pdata[bus_id - 1].clkrate = clkrate;
+
+	i2c_pdata[bus_id - 1].clkrate &= ~OMAP_I2C_CMDLINE_SETUP;
+
+	return omap_i2c_add_bus(&i2c_pdata[bus_id - 1], bus_id);
+}
diff --git a/kernel/arch/arm/plat-omap/include/plat/counter-32k.h b/kernel/arch/arm/plat-omap/include/plat/counter-32k.h
new file mode 100644
index 000000000..da000d482
--- /dev/null
+++ b/kernel/arch/arm/plat-omap/include/plat/counter-32k.h
@@ -0,0 +1 @@
+int omap_init_clocksource_32k(void __iomem *vbase);
diff --git a/kernel/arch/arm/plat-omap/include/plat/cpu.h b/kernel/arch/arm/plat-omap/include/plat/cpu.h
new file mode 100644
index 000000000..c9a66bf36
--- /dev/null
+++ b/kernel/arch/arm/plat-omap/include/plat/cpu.h
@@ -0,0 +1,35 @@
+/*
+ * OMAP cpu type detection
+ *
+ * Copyright (C) 2004, 2008 Nokia Corporation
+ *
+ * Copyright (C) 2009-11 Texas Instruments.
+ *
+ * Written by Tony Lindgren <tony.lindgren@nokia.com>
+ *
+ * Added OMAP4/5 specific defines - Santosh Shilimkar<santosh.shilimkar@ti.com>
+ *
+ * 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
+ *
+ */
+
+#ifndef __ASM_ARCH_OMAP_CPU_H
+#define __ASM_ARCH_OMAP_CPU_H
+
+#ifdef CONFIG_ARCH_OMAP1
+#include <mach/soc.h>
+#endif
+
+#endif
diff --git a/kernel/arch/arm/plat-omap/include/plat/dmtimer.h b/kernel/arch/arm/plat-omap/include/plat/dmtimer.h
new file mode 100644
index 000000000..dd79f3005
--- /dev/null
+++ b/kernel/arch/arm/plat-omap/include/plat/dmtimer.h
@@ -0,0 +1,418 @@
+/*
+ * arch/arm/plat-omap/include/plat/dmtimer.h
+ *
+ * OMAP Dual-Mode Timers
+ *
+ * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
+ * Tarun Kanti DebBarma <tarun.kanti@ti.com>
+ * Thara Gopinath <thara@ti.com>
+ *
+ * Platform device conversion and hwmod support.
+ *
+ * Copyright (C) 2005 Nokia Corporation
+ * Author: Lauri Leukkunen <lauri.leukkunen@nokia.com>
+ * PWM and clock framwork support by Timo Teras.
+ *
+ * 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+ * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * 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/delay.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+
+#ifndef __ASM_ARCH_DMTIMER_H
+#define __ASM_ARCH_DMTIMER_H
+
+/* clock sources */
+#define OMAP_TIMER_SRC_SYS_CLK			0x00
+#define OMAP_TIMER_SRC_32_KHZ			0x01
+#define OMAP_TIMER_SRC_EXT_CLK			0x02
+
+/* timer interrupt enable bits */
+#define OMAP_TIMER_INT_CAPTURE			(1 << 2)
+#define OMAP_TIMER_INT_OVERFLOW			(1 << 1)
+#define OMAP_TIMER_INT_MATCH			(1 << 0)
+
+/* trigger types */
+#define OMAP_TIMER_TRIGGER_NONE			0x00
+#define OMAP_TIMER_TRIGGER_OVERFLOW		0x01
+#define OMAP_TIMER_TRIGGER_OVERFLOW_AND_COMPARE	0x02
+
+/* posted mode types */
+#define OMAP_TIMER_NONPOSTED			0x00
+#define OMAP_TIMER_POSTED			0x01
+
+/* timer capabilities used in hwmod database */
+#define OMAP_TIMER_SECURE				0x80000000
+#define OMAP_TIMER_ALWON				0x40000000
+#define OMAP_TIMER_HAS_PWM				0x20000000
+#define OMAP_TIMER_NEEDS_RESET				0x10000000
+#define OMAP_TIMER_HAS_DSP_IRQ				0x08000000
+
+/*
+ * timer errata flags
+ *
+ * Errata i103/i767 impacts all OMAP3/4/5 devices including AM33xx. This
+ * errata prevents us from using posted mode on these devices, unless the
+ * timer counter register is never read. For more details please refer to
+ * the OMAP3/4/5 errata documents.
+ */
+#define OMAP_TIMER_ERRATA_I103_I767			0x80000000
+
+struct omap_timer_capability_dev_attr {
+	u32 timer_capability;
+};
+
+struct timer_regs {
+	u32 tidr;
+	u32 tier;
+	u32 twer;
+	u32 tclr;
+	u32 tcrr;
+	u32 tldr;
+	u32 ttrg;
+	u32 twps;
+	u32 tmar;
+	u32 tcar1;
+	u32 tsicr;
+	u32 tcar2;
+	u32 tpir;
+	u32 tnir;
+	u32 tcvr;
+	u32 tocr;
+	u32 towr;
+};
+
+struct omap_dm_timer {
+	int id;
+	int irq;
+	struct clk *fclk;
+
+	void __iomem	*io_base;
+	void __iomem	*irq_stat;	/* TISR/IRQSTATUS interrupt status */
+	void __iomem	*irq_ena;	/* irq enable */
+	void __iomem	*irq_dis;	/* irq disable, only on v2 ip */
+	void __iomem	*pend;		/* write pending */
+	void __iomem	*func_base;	/* function register base */
+
+	unsigned long rate;
+	unsigned reserved:1;
+	unsigned posted:1;
+	struct timer_regs context;
+	int (*get_context_loss_count)(struct device *);
+	int ctx_loss_count;
+	int revision;
+	u32 capability;
+	u32 errata;
+	struct platform_device *pdev;
+	struct list_head node;
+};
+
+int omap_dm_timer_reserve_systimer(int id);
+struct omap_dm_timer *omap_dm_timer_request(void);
+struct omap_dm_timer *omap_dm_timer_request_specific(int timer_id);
+struct omap_dm_timer *omap_dm_timer_request_by_cap(u32 cap);
+struct omap_dm_timer *omap_dm_timer_request_by_node(struct device_node *np);
+int omap_dm_timer_free(struct omap_dm_timer *timer);
+void omap_dm_timer_enable(struct omap_dm_timer *timer);
+void omap_dm_timer_disable(struct omap_dm_timer *timer);
+
+int omap_dm_timer_get_irq(struct omap_dm_timer *timer);
+
+u32 omap_dm_timer_modify_idlect_mask(u32 inputmask);
+struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *timer);
+
+int omap_dm_timer_trigger(struct omap_dm_timer *timer);
+int omap_dm_timer_start(struct omap_dm_timer *timer);
+int omap_dm_timer_stop(struct omap_dm_timer *timer);
+
+int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source);
+int omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload, unsigned int value);
+int omap_dm_timer_set_load_start(struct omap_dm_timer *timer, int autoreload, unsigned int value);
+int omap_dm_timer_set_match(struct omap_dm_timer *timer, int enable, unsigned int match);
+int omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on, int toggle, int trigger);
+int omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler);
+
+int omap_dm_timer_set_int_enable(struct omap_dm_timer *timer, unsigned int value);
+int omap_dm_timer_set_int_disable(struct omap_dm_timer *timer, u32 mask);
+
+unsigned int omap_dm_timer_read_status(struct omap_dm_timer *timer);
+int omap_dm_timer_write_status(struct omap_dm_timer *timer, unsigned int value);
+unsigned int omap_dm_timer_read_counter(struct omap_dm_timer *timer);
+int omap_dm_timer_write_counter(struct omap_dm_timer *timer, unsigned int value);
+
+int omap_dm_timers_active(void);
+
+/*
+ * Do not use the defines below, they are not needed. They should be only
+ * used by dmtimer.c and sys_timer related code.
+ */
+
+/*
+ * The interrupt registers are different between v1 and v2 ip.
+ * These registers are offsets from timer->iobase.
+ */
+#define OMAP_TIMER_ID_OFFSET		0x00
+#define OMAP_TIMER_OCP_CFG_OFFSET	0x10
+
+#define OMAP_TIMER_V1_SYS_STAT_OFFSET	0x14
+#define OMAP_TIMER_V1_STAT_OFFSET	0x18
+#define OMAP_TIMER_V1_INT_EN_OFFSET	0x1c
+
+#define OMAP_TIMER_V2_IRQSTATUS_RAW	0x24
+#define OMAP_TIMER_V2_IRQSTATUS		0x28
+#define OMAP_TIMER_V2_IRQENABLE_SET	0x2c
+#define OMAP_TIMER_V2_IRQENABLE_CLR	0x30
+
+/*
+ * The functional registers have a different base on v1 and v2 ip.
+ * These registers are offsets from timer->func_base. The func_base
+ * is samae as io_base for v1 and io_base + 0x14 for v2 ip.
+ *
+ */
+#define OMAP_TIMER_V2_FUNC_OFFSET		0x14
+
+#define _OMAP_TIMER_WAKEUP_EN_OFFSET	0x20
+#define _OMAP_TIMER_CTRL_OFFSET		0x24
+#define		OMAP_TIMER_CTRL_GPOCFG		(1 << 14)
+#define		OMAP_TIMER_CTRL_CAPTMODE	(1 << 13)
+#define		OMAP_TIMER_CTRL_PT		(1 << 12)
+#define		OMAP_TIMER_CTRL_TCM_LOWTOHIGH	(0x1 << 8)
+#define		OMAP_TIMER_CTRL_TCM_HIGHTOLOW	(0x2 << 8)
+#define		OMAP_TIMER_CTRL_TCM_BOTHEDGES	(0x3 << 8)
+#define		OMAP_TIMER_CTRL_SCPWM		(1 << 7)
+#define		OMAP_TIMER_CTRL_CE		(1 << 6) /* compare enable */
+#define		OMAP_TIMER_CTRL_PRE		(1 << 5) /* prescaler enable */
+#define		OMAP_TIMER_CTRL_PTV_SHIFT	2 /* prescaler value shift */
+#define		OMAP_TIMER_CTRL_POSTED		(1 << 2)
+#define		OMAP_TIMER_CTRL_AR		(1 << 1) /* auto-reload enable */
+#define		OMAP_TIMER_CTRL_ST		(1 << 0) /* start timer */
+#define _OMAP_TIMER_COUNTER_OFFSET	0x28
+#define _OMAP_TIMER_LOAD_OFFSET		0x2c
+#define _OMAP_TIMER_TRIGGER_OFFSET	0x30
+#define _OMAP_TIMER_WRITE_PEND_OFFSET	0x34
+#define		WP_NONE			0	/* no write pending bit */
+#define		WP_TCLR			(1 << 0)
+#define		WP_TCRR			(1 << 1)
+#define		WP_TLDR			(1 << 2)
+#define		WP_TTGR			(1 << 3)
+#define		WP_TMAR			(1 << 4)
+#define		WP_TPIR			(1 << 5)
+#define		WP_TNIR			(1 << 6)
+#define		WP_TCVR			(1 << 7)
+#define		WP_TOCR			(1 << 8)
+#define		WP_TOWR			(1 << 9)
+#define _OMAP_TIMER_MATCH_OFFSET	0x38
+#define _OMAP_TIMER_CAPTURE_OFFSET	0x3c
+#define _OMAP_TIMER_IF_CTRL_OFFSET	0x40
+#define _OMAP_TIMER_CAPTURE2_OFFSET		0x44	/* TCAR2, 34xx only */
+#define _OMAP_TIMER_TICK_POS_OFFSET		0x48	/* TPIR, 34xx only */
+#define _OMAP_TIMER_TICK_NEG_OFFSET		0x4c	/* TNIR, 34xx only */
+#define _OMAP_TIMER_TICK_COUNT_OFFSET		0x50	/* TCVR, 34xx only */
+#define _OMAP_TIMER_TICK_INT_MASK_SET_OFFSET	0x54	/* TOCR, 34xx only */
+#define _OMAP_TIMER_TICK_INT_MASK_COUNT_OFFSET	0x58	/* TOWR, 34xx only */
+
+/* register offsets with the write pending bit encoded */
+#define	WPSHIFT					16
+
+#define OMAP_TIMER_WAKEUP_EN_REG		(_OMAP_TIMER_WAKEUP_EN_OFFSET \
+							| (WP_NONE << WPSHIFT))
+
+#define OMAP_TIMER_CTRL_REG			(_OMAP_TIMER_CTRL_OFFSET \
+							| (WP_TCLR << WPSHIFT))
+
+#define OMAP_TIMER_COUNTER_REG			(_OMAP_TIMER_COUNTER_OFFSET \
+							| (WP_TCRR << WPSHIFT))
+
+#define OMAP_TIMER_LOAD_REG			(_OMAP_TIMER_LOAD_OFFSET \
+							| (WP_TLDR << WPSHIFT))
+
+#define OMAP_TIMER_TRIGGER_REG			(_OMAP_TIMER_TRIGGER_OFFSET \
+							| (WP_TTGR << WPSHIFT))
+
+#define OMAP_TIMER_WRITE_PEND_REG		(_OMAP_TIMER_WRITE_PEND_OFFSET \
+							| (WP_NONE << WPSHIFT))
+
+#define OMAP_TIMER_MATCH_REG			(_OMAP_TIMER_MATCH_OFFSET \
+							| (WP_TMAR << WPSHIFT))
+
+#define OMAP_TIMER_CAPTURE_REG			(_OMAP_TIMER_CAPTURE_OFFSET \
+							| (WP_NONE << WPSHIFT))
+
+#define OMAP_TIMER_IF_CTRL_REG			(_OMAP_TIMER_IF_CTRL_OFFSET \
+							| (WP_NONE << WPSHIFT))
+
+#define OMAP_TIMER_CAPTURE2_REG			(_OMAP_TIMER_CAPTURE2_OFFSET \
+							| (WP_NONE << WPSHIFT))
+
+#define OMAP_TIMER_TICK_POS_REG			(_OMAP_TIMER_TICK_POS_OFFSET \
+							| (WP_TPIR << WPSHIFT))
+
+#define OMAP_TIMER_TICK_NEG_REG			(_OMAP_TIMER_TICK_NEG_OFFSET \
+							| (WP_TNIR << WPSHIFT))
+
+#define OMAP_TIMER_TICK_COUNT_REG		(_OMAP_TIMER_TICK_COUNT_OFFSET \
+							| (WP_TCVR << WPSHIFT))
+
+#define OMAP_TIMER_TICK_INT_MASK_SET_REG				\
+		(_OMAP_TIMER_TICK_INT_MASK_SET_OFFSET | (WP_TOCR << WPSHIFT))
+
+#define OMAP_TIMER_TICK_INT_MASK_COUNT_REG				\
+		(_OMAP_TIMER_TICK_INT_MASK_COUNT_OFFSET | (WP_TOWR << WPSHIFT))
+
+static inline u32 __omap_dm_timer_read(struct omap_dm_timer *timer, u32 reg,
+						int posted)
+{
+	if (posted)
+		while (readl_relaxed(timer->pend) & (reg >> WPSHIFT))
+			cpu_relax();
+
+	return readl_relaxed(timer->func_base + (reg & 0xff));
+}
+
+static inline void __omap_dm_timer_write(struct omap_dm_timer *timer,
+					u32 reg, u32 val, int posted)
+{
+	if (posted)
+		while (readl_relaxed(timer->pend) & (reg >> WPSHIFT))
+			cpu_relax();
+
+	writel_relaxed(val, timer->func_base + (reg & 0xff));
+}
+
+static inline void __omap_dm_timer_init_regs(struct omap_dm_timer *timer)
+{
+	u32 tidr;
+
+	/* Assume v1 ip if bits [31:16] are zero */
+	tidr = readl_relaxed(timer->io_base);
+	if (!(tidr >> 16)) {
+		timer->revision = 1;
+		timer->irq_stat = timer->io_base + OMAP_TIMER_V1_STAT_OFFSET;
+		timer->irq_ena = timer->io_base + OMAP_TIMER_V1_INT_EN_OFFSET;
+		timer->irq_dis = timer->io_base + OMAP_TIMER_V1_INT_EN_OFFSET;
+		timer->pend = timer->io_base + _OMAP_TIMER_WRITE_PEND_OFFSET;
+		timer->func_base = timer->io_base;
+	} else {
+		timer->revision = 2;
+		timer->irq_stat = timer->io_base + OMAP_TIMER_V2_IRQSTATUS;
+		timer->irq_ena = timer->io_base + OMAP_TIMER_V2_IRQENABLE_SET;
+		timer->irq_dis = timer->io_base + OMAP_TIMER_V2_IRQENABLE_CLR;
+		timer->pend = timer->io_base +
+			_OMAP_TIMER_WRITE_PEND_OFFSET +
+				OMAP_TIMER_V2_FUNC_OFFSET;
+		timer->func_base = timer->io_base + OMAP_TIMER_V2_FUNC_OFFSET;
+	}
+}
+
+/*
+ * __omap_dm_timer_enable_posted - enables write posted mode
+ * @timer:      pointer to timer instance handle
+ *
+ * Enables the write posted mode for the timer. When posted mode is enabled
+ * writes to certain timer registers are immediately acknowledged by the
+ * internal bus and hence prevents stalling the CPU waiting for the write to
+ * complete. Enabling this feature can improve performance for writing to the
+ * timer registers.
+ */
+static inline void __omap_dm_timer_enable_posted(struct omap_dm_timer *timer)
+{
+	if (timer->posted)
+		return;
+
+	if (timer->errata & OMAP_TIMER_ERRATA_I103_I767) {
+		timer->posted = OMAP_TIMER_NONPOSTED;
+		__omap_dm_timer_write(timer, OMAP_TIMER_IF_CTRL_REG, 0, 0);
+		return;
+	}
+
+	__omap_dm_timer_write(timer, OMAP_TIMER_IF_CTRL_REG,
+			      OMAP_TIMER_CTRL_POSTED, 0);
+	timer->context.tsicr = OMAP_TIMER_CTRL_POSTED;
+	timer->posted = OMAP_TIMER_POSTED;
+}
+
+/**
+ * __omap_dm_timer_override_errata - override errata flags for a timer
+ * @timer:      pointer to timer handle
+ * @errata:	errata flags to be ignored
+ *
+ * For a given timer, override a timer errata by clearing the flags
+ * specified by the errata argument. A specific erratum should only be
+ * overridden for a timer if the timer is used in such a way the erratum
+ * has no impact.
+ */
+static inline void __omap_dm_timer_override_errata(struct omap_dm_timer *timer,
+						   u32 errata)
+{
+	timer->errata &= ~errata;
+}
+
+static inline void __omap_dm_timer_stop(struct omap_dm_timer *timer,
+					int posted, unsigned long rate)
+{
+	u32 l;
+
+	l = __omap_dm_timer_read(timer, OMAP_TIMER_CTRL_REG, posted);
+	if (l & OMAP_TIMER_CTRL_ST) {
+		l &= ~0x1;
+		__omap_dm_timer_write(timer, OMAP_TIMER_CTRL_REG, l, posted);
+#ifdef CONFIG_ARCH_OMAP2PLUS
+		/* Readback to make sure write has completed */
+		__omap_dm_timer_read(timer, OMAP_TIMER_CTRL_REG, posted);
+		/*
+		 * Wait for functional clock period x 3.5 to make sure that
+		 * timer is stopped
+		 */
+		udelay(3500000 / rate + 1);
+#endif
+	}
+
+	/* Ack possibly pending interrupt */
+	writel_relaxed(OMAP_TIMER_INT_OVERFLOW, timer->irq_stat);
+}
+
+static inline void __omap_dm_timer_load_start(struct omap_dm_timer *timer,
+						u32 ctrl, unsigned int load,
+						int posted)
+{
+	__omap_dm_timer_write(timer, OMAP_TIMER_COUNTER_REG, load, posted);
+	__omap_dm_timer_write(timer, OMAP_TIMER_CTRL_REG, ctrl, posted);
+}
+
+static inline void __omap_dm_timer_int_enable(struct omap_dm_timer *timer,
+						unsigned int value)
+{
+	writel_relaxed(value, timer->irq_ena);
+	__omap_dm_timer_write(timer, OMAP_TIMER_WAKEUP_EN_REG, value, 0);
+}
+
+static inline unsigned int
+__omap_dm_timer_read_counter(struct omap_dm_timer *timer, int posted)
+{
+	return __omap_dm_timer_read(timer, OMAP_TIMER_COUNTER_REG, posted);
+}
+
+static inline void __omap_dm_timer_write_status(struct omap_dm_timer *timer,
+						unsigned int value)
+{
+	writel_relaxed(value, timer->irq_stat);
+}
+
+#endif /* __ASM_ARCH_DMTIMER_H */
diff --git a/kernel/arch/arm/plat-omap/include/plat/i2c.h b/kernel/arch/arm/plat-omap/include/plat/i2c.h
new file mode 100644
index 000000000..810629d79
--- /dev/null
+++ b/kernel/arch/arm/plat-omap/include/plat/i2c.h
@@ -0,0 +1,53 @@
+/*
+ * Helper module for board specific I2C bus registration
+ *
+ * Copyright (C) 2009 Nokia Corporation.
+ *
+ * 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.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#ifndef __PLAT_OMAP_I2C_H
+#define __PLAT_OMAP_I2C_H
+
+struct i2c_board_info;
+struct omap_i2c_bus_platform_data;
+
+int omap_i2c_add_bus(struct omap_i2c_bus_platform_data *i2c_pdata,
+			int bus_id);
+
+#if defined(CONFIG_I2C_OMAP) || defined(CONFIG_I2C_OMAP_MODULE)
+extern int omap_register_i2c_bus(int bus_id, u32 clkrate,
+				 struct i2c_board_info const *info,
+				 unsigned len);
+extern int omap_register_i2c_bus_cmdline(void);
+#else
+static inline int omap_register_i2c_bus(int bus_id, u32 clkrate,
+				 struct i2c_board_info const *info,
+				 unsigned len)
+{
+	return 0;
+}
+
+static inline int omap_register_i2c_bus_cmdline(void)
+{
+	return 0;
+}
+#endif
+
+struct omap_hwmod;
+int omap_i2c_reset(struct omap_hwmod *oh);
+
+#endif /* __PLAT_OMAP_I2C_H */
diff --git a/kernel/arch/arm/plat-omap/include/plat/sram.h b/kernel/arch/arm/plat-omap/include/plat/sram.h
new file mode 100644
index 000000000..ba4525059
--- /dev/null
+++ b/kernel/arch/arm/plat-omap/include/plat/sram.h
@@ -0,0 +1,16 @@
+int omap_sram_init(void);
+
+void omap_map_sram(unsigned long start, unsigned long size,
+			unsigned long skip, int cached);
+void omap_sram_reset(void);
+
+extern void *omap_sram_push_address(unsigned long size);
+
+/* Macro to push a function to the internal SRAM, using the fncpy API */
+#define omap_sram_push(funcp, size) ({				\
+	typeof(&(funcp)) _res = NULL;				\
+	void *_sram_address = omap_sram_push_address(size);	\
+	if (_sram_address)					\
+		_res = fncpy(_sram_address, &(funcp), size);	\
+	_res;							\
+})
diff --git a/kernel/arch/arm/plat-omap/sram.c b/kernel/arch/arm/plat-omap/sram.c
new file mode 100644
index 000000000..a5bc92d7e
--- /dev/null
+++ b/kernel/arch/arm/plat-omap/sram.c
@@ -0,0 +1,98 @@
+/*
+ * linux/arch/arm/plat-omap/sram.c
+ *
+ * OMAP SRAM detection and management
+ *
+ * Copyright (C) 2005 Nokia Corporation
+ * Written by Tony Lindgren <tony@atomide.com>
+ *
+ * Copyright (C) 2009-2012 Texas Instruments
+ * Added OMAP4/5 support - Santosh Shilimkar <santosh.shilimkar@ti.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.
+ */
+#undef DEBUG
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+
+#include <asm/fncpy.h>
+#include <asm/tlb.h>
+#include <asm/cacheflush.h>
+
+#include <asm/mach/map.h>
+
+#include <plat/sram.h>
+
+#define ROUND_DOWN(value,boundary)	((value) & (~((boundary)-1)))
+
+static void __iomem *omap_sram_base;
+static unsigned long omap_sram_skip;
+static unsigned long omap_sram_size;
+static void __iomem *omap_sram_ceil;
+
+/*
+ * Memory allocator for SRAM: calculates the new ceiling address
+ * for pushing a function using the fncpy API.
+ *
+ * Note that fncpy requires the returned address to be aligned
+ * to an 8-byte boundary.
+ */
+void *omap_sram_push_address(unsigned long size)
+{
+	unsigned long available, new_ceil = (unsigned long)omap_sram_ceil;
+
+	available = omap_sram_ceil - (omap_sram_base + omap_sram_skip);
+
+	if (size > available) {
+		pr_err("Not enough space in SRAM\n");
+		return NULL;
+	}
+
+	new_ceil -= size;
+	new_ceil = ROUND_DOWN(new_ceil, FNCPY_ALIGN);
+	omap_sram_ceil = IOMEM(new_ceil);
+
+	return (void *)omap_sram_ceil;
+}
+
+/*
+ * The SRAM context is lost during off-idle and stack
+ * needs to be reset.
+ */
+void omap_sram_reset(void)
+{
+	omap_sram_ceil = omap_sram_base + omap_sram_size;
+}
+
+/*
+ * Note that we cannot use ioremap for SRAM, as clock init needs SRAM early.
+ */
+void __init omap_map_sram(unsigned long start, unsigned long size,
+				 unsigned long skip, int cached)
+{
+	if (size == 0)
+		return;
+
+	start = ROUND_DOWN(start, PAGE_SIZE);
+	omap_sram_size = size;
+	omap_sram_skip = skip;
+	omap_sram_base = __arm_ioremap_exec(start, size, cached);
+	if (!omap_sram_base) {
+		pr_err("SRAM: Could not map\n");
+		return;
+	}
+
+	omap_sram_reset();
+
+	/*
+	 * Looks like we need to preserve some bootloader code at the
+	 * beginning of SRAM for jumping to flash for reboot to work...
+	 */
+	memset_io(omap_sram_base + omap_sram_skip, 0,
+		  omap_sram_size - omap_sram_skip);
+}