ARM: keystone: Enable SMP support on Keystone machines

Add basic SMP support for Keystone machines. This does not
include support for CPU hotplug for now.

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: arm@kernel.org

Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>

1 files changed, 52 insertions, 0 deletions

diff --git a/arch/arm/mach-keystone/platsmp.c b/arch/arm/mach-keystone/platsmp.c
new file mode 100644
index 000000000000..630ab3bd5f78
--- /dev/null
+++ b/arch/arm/mach-keystone/platsmp.c
@@ -0,0 +1,52 @@
+/*
+ * Keystone SOC SMP platform code
+ *
+ * Copyright 2013 Texas Instruments, Inc.
+ *	Cyril Chemparathy <cyril@ti.com>
+ *	Santosh Shilimkar <santosh.shillimkar@ti.com>
+ *
+ * Based on platsmp.c, Copyright (C) 2002 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ */
+
+#include <linux/init.h>
+#include <linux/smp.h>
+#include <linux/io.h>
+
+#include <asm/smp_plat.h>
+#include <asm/prom.h>
+
+#include "keystone.h"
+
+static int __cpuinit keystone_smp_boot_secondary(unsigned int cpu,
+						struct task_struct *idle)
+{
+	unsigned long start = virt_to_phys(&secondary_startup);
+	int error;
+
+	pr_debug("keystone-smp: booting cpu %d, vector %08lx\n",
+		 cpu, start);
+
+	asm volatile (
+		"mov    r0, #0\n"	/* power on cmd	*/
+		"mov    r1, %1\n"	/* cpu		*/
+		"mov    r2, %2\n"	/* start	*/
+		".inst  0xe1600070\n"	/* smc #0	*/
+		"mov    %0, r0\n"
+		: "=r" (error)
+		: "r"(cpu), "r"(start)
+		: "cc", "r0", "r1", "r2", "memory"
+	);
+
+	pr_debug("keystone-smp: monitor returned %d\n", error);
+
+	return error;
+}
+
+struct smp_operations keystone_smp_ops __initdata = {
+	.smp_init_cpus		= arm_dt_init_cpu_maps,
+	.smp_boot_secondary	= keystone_smp_boot_secondary,
+};