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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>
hifive-unleashed-5.1
Santosh Shilimkar 2013-06-10 12:20:17 -04:00
parent 828989ad87
commit f07cb6a089
5 changed files with 75 additions and 0 deletions
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1
arch/arm/mach-keystone/Kconfig
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@ -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

1
arch/arm/mach-keystone/Makefile
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@ -1 +1,2 @@
obj-y := keystone.o
obj-$(CONFIG_SMP) += platsmp.o

4
arch/arm/mach-keystone/keystone.c
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@ -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,

17
arch/arm/mach-keystone/keystone.h 100644
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@ -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__ */

52
arch/arm/mach-keystone/platsmp.c 100644
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@ -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,
};