![Santosh Shilimkar](/assets/img/avatar_default.png)
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>
53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
/*
|
|
* 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,
|
|
};
|