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authorSantosh Shilimkar <santosh.shilimkar@ti.com>2013-06-10 12:20:17 -0400
committerSantosh Shilimkar <santosh.shilimkar@ti.com>2013-06-17 18:35:35 -0400
commitf07cb6a089644e2334c3523af589d9233cc18c74 (patch)
tree916c2c2ee1e558b7369d565e7d0fbe8443f153b8 /arch/arm/mach-keystone
parent828989ad87af15b555f783a70efa2cc526b35b3f (diff)
downloadlinux-linaro-stable-f07cb6a089644e2334c3523af589d9233cc18c74.tar.gz
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>
Diffstat (limited to 'arch/arm/mach-keystone')
-rw-r--r--arch/arm/mach-keystone/Kconfig1
-rw-r--r--arch/arm/mach-keystone/Makefile1
-rw-r--r--arch/arm/mach-keystone/keystone.c4
-rw-r--r--arch/arm/mach-keystone/keystone.h17
-rw-r--r--arch/arm/mach-keystone/platsmp.c52
5 files changed, 75 insertions, 0 deletions
diff --git a/arch/arm/mach-keystone/Kconfig b/arch/arm/mach-keystone/Kconfig
index aebe8cdd88fc..2dbd4ce3653c 100644
--- a/arch/arm/mach-keystone/Kconfig
+++ b/arch/arm/mach-keystone/Kconfig
@@ -4,6 +4,7 @@ config ARCH_KEYSTONE
select CPU_V7
select ARM_GIC
select HAVE_ARM_ARCH_TIMER
+ select HAVE_SMP
select CLKSRC_MMIO
select GENERIC_CLOCKEVENTS
select HAVE_SCHED_CLOCK
diff --git a/arch/arm/mach-keystone/Makefile b/arch/arm/mach-keystone/Makefile
index d4671d55215a..3f6b8ab82235 100644
--- a/arch/arm/mach-keystone/Makefile
+++ b/arch/arm/mach-keystone/Makefile
@@ -1 +1,2 @@
obj-y := keystone.o
+obj-$(CONFIG_SMP) += platsmp.o
diff --git a/arch/arm/mach-keystone/keystone.c b/arch/arm/mach-keystone/keystone.c
index a67c19b8be20..fe4d9ff93a7e 100644
--- a/arch/arm/mach-keystone/keystone.c
+++ b/arch/arm/mach-keystone/keystone.c
@@ -19,6 +19,9 @@
#include <asm/mach/map.h>
#include <asm/mach/arch.h>
#include <asm/mach/time.h>
+#include <asm/smp_plat.h>
+
+#include "keystone.h"
#define PLL_RESET_WRITE_KEY_MASK 0xffff0000
#define PLL_RESET_WRITE_KEY 0x5a69
@@ -65,6 +68,7 @@ void keystone_restart(char mode, const char *cmd)
}
DT_MACHINE_START(KEYSTONE, "Keystone")
+ .smp = smp_ops(keystone_smp_ops),
.init_machine = keystone_init,
.dt_compat = keystone_match,
.restart = keystone_restart,
diff --git a/arch/arm/mach-keystone/keystone.h b/arch/arm/mach-keystone/keystone.h
new file mode 100644
index 000000000000..43a1b4789a6e
--- /dev/null
+++ b/arch/arm/mach-keystone/keystone.h
@@ -0,0 +1,17 @@
+/*
+ * Copyright 2013 Texas Instruments, Inc.
+ * Cyril Chemparathy <cyril@ti.com>
+ * Santosh Shilimkar <santosh.shillimkar@ti.com>
+ *
+ * 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.
+ */
+
+#ifndef __KEYSTONE_H__
+#define __KEYSTONE_H__
+
+extern struct smp_operations keystone_smp_ops;
+extern void secondary_startup(void);
+
+#endif /* __KEYSTONE_H__ */
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,
+};