1 files changed, 166 insertions, 0 deletions

diff --git a/kernel/arch/sh/kernel/cpu/sh4a/smp-shx3.c b/kernel/arch/sh/kernel/cpu/sh4a/smp-shx3.c
new file mode 100644
index 000000000..4a2988087
--- /dev/null
+++ b/kernel/arch/sh/kernel/cpu/sh4a/smp-shx3.c
@@ -0,0 +1,166 @@
+/*
+ * SH-X3 SMP
+ *
+ *  Copyright (C) 2007 - 2010  Paul Mundt
+ *  Copyright (C) 2007  Magnus Damm
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/cpumask.h>
+#include <linux/smp.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+#include <linux/cpu.h>
+#include <asm/sections.h>
+
+#define STBCR_REG(phys_id) (0xfe400004 | (phys_id << 12))
+#define RESET_REG(phys_id) (0xfe400008 | (phys_id << 12))
+
+#define STBCR_MSTP	0x00000001
+#define STBCR_RESET	0x00000002
+#define STBCR_SLEEP	0x00000004
+#define STBCR_LTSLP	0x80000000
+
+static irqreturn_t ipi_interrupt_handler(int irq, void *arg)
+{
+	unsigned int message = (unsigned int)(long)arg;
+	unsigned int cpu = hard_smp_processor_id();
+	unsigned int offs = 4 * cpu;
+	unsigned int x;
+
+	x = __raw_readl(0xfe410070 + offs); /* C0INITICI..CnINTICI */
+	x &= (1 << (message << 2));
+	__raw_writel(x, 0xfe410080 + offs); /* C0INTICICLR..CnINTICICLR */
+
+	smp_message_recv(message);
+
+	return IRQ_HANDLED;
+}
+
+static void shx3_smp_setup(void)
+{
+	unsigned int cpu = 0;
+	int i, num;
+
+	init_cpu_possible(cpumask_of(cpu));
+
+	/* Enable light sleep for the boot CPU */
+	__raw_writel(__raw_readl(STBCR_REG(cpu)) | STBCR_LTSLP, STBCR_REG(cpu));
+
+	__cpu_number_map[0] = 0;
+	__cpu_logical_map[0] = 0;
+
+	/*
+	 * Do this stupidly for now.. we don't have an easy way to probe
+	 * for the total number of cores.
+	 */
+	for (i = 1, num = 0; i < NR_CPUS; i++) {
+		set_cpu_possible(i, true);
+		__cpu_number_map[i] = ++num;
+		__cpu_logical_map[num] = i;
+	}
+
+        printk(KERN_INFO "Detected %i available secondary CPU(s)\n", num);
+}
+
+static void shx3_prepare_cpus(unsigned int max_cpus)
+{
+	int i;
+
+	local_timer_setup(0);
+
+	BUILD_BUG_ON(SMP_MSG_NR >= 8);
+
+	for (i = 0; i < SMP_MSG_NR; i++)
+		request_irq(104 + i, ipi_interrupt_handler,
+			    IRQF_PERCPU, "IPI", (void *)(long)i);
+
+	for (i = 0; i < max_cpus; i++)
+		set_cpu_present(i, true);
+}
+
+static void shx3_start_cpu(unsigned int cpu, unsigned long entry_point)
+{
+	if (__in_29bit_mode())
+		__raw_writel(entry_point, RESET_REG(cpu));
+	else
+		__raw_writel(virt_to_phys(entry_point), RESET_REG(cpu));
+
+	if (!(__raw_readl(STBCR_REG(cpu)) & STBCR_MSTP))
+		__raw_writel(STBCR_MSTP, STBCR_REG(cpu));
+
+	while (!(__raw_readl(STBCR_REG(cpu)) & STBCR_MSTP))
+		cpu_relax();
+
+	/* Start up secondary processor by sending a reset */
+	__raw_writel(STBCR_RESET | STBCR_LTSLP, STBCR_REG(cpu));
+}
+
+static unsigned int shx3_smp_processor_id(void)
+{
+	return __raw_readl(0xff000048); /* CPIDR */
+}
+
+static void shx3_send_ipi(unsigned int cpu, unsigned int message)
+{
+	unsigned long addr = 0xfe410070 + (cpu * 4);
+
+	BUG_ON(cpu >= 4);
+
+	__raw_writel(1 << (message << 2), addr); /* C0INTICI..CnINTICI */
+}
+
+static void shx3_update_boot_vector(unsigned int cpu)
+{
+	__raw_writel(STBCR_MSTP, STBCR_REG(cpu));
+	while (!(__raw_readl(STBCR_REG(cpu)) & STBCR_MSTP))
+		cpu_relax();
+	__raw_writel(STBCR_RESET, STBCR_REG(cpu));
+}
+
+static int
+shx3_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
+{
+	unsigned int cpu = (unsigned int)hcpu;
+
+	switch (action) {
+	case CPU_UP_PREPARE:
+		shx3_update_boot_vector(cpu);
+		break;
+	case CPU_ONLINE:
+		pr_info("CPU %u is now online\n", cpu);
+		break;
+	case CPU_DEAD:
+		break;
+	}
+
+	return NOTIFY_OK;
+}
+
+static struct notifier_block shx3_cpu_notifier = {
+	.notifier_call		= shx3_cpu_callback,
+};
+
+static int register_shx3_cpu_notifier(void)
+{
+	register_hotcpu_notifier(&shx3_cpu_notifier);
+	return 0;
+}
+late_initcall(register_shx3_cpu_notifier);
+
+struct plat_smp_ops shx3_smp_ops = {
+	.smp_setup		= shx3_smp_setup,
+	.prepare_cpus		= shx3_prepare_cpus,
+	.start_cpu		= shx3_start_cpu,
+	.smp_processor_id	= shx3_smp_processor_id,
+	.send_ipi		= shx3_send_ipi,
+	.cpu_die		= native_cpu_die,
+	.cpu_disable		= native_cpu_disable,
+	.play_dead		= native_play_dead,
+};