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>
diff --git a/arch/arm/mach-keystone/platsmp.c b/arch/arm/mach-keystone/platsmp.c
new file mode 100644
index 0000000..630ab3b
--- /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,
+};