128 строки
3.1 KiB
C
128 строки
3.1 KiB
C
/*
|
|
* SMP support for R-Mobile / SH-Mobile - r8a7779 portion
|
|
*
|
|
* Copyright (C) 2011 Renesas Solutions Corp.
|
|
* Copyright (C) 2011 Magnus Damm
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; version 2 of the License.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/io.h>
|
|
#include <linux/delay.h>
|
|
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/smp_plat.h>
|
|
#include <asm/smp_scu.h>
|
|
|
|
#include "common.h"
|
|
#include "pm-rcar.h"
|
|
#include "r8a7779.h"
|
|
|
|
#define AVECR IOMEM(0xfe700040)
|
|
#define R8A7779_SCU_BASE 0xf0000000
|
|
|
|
static const struct rcar_sysc_ch r8a7779_ch_cpu1 = {
|
|
.chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
|
|
.chan_bit = 1, /* ARM1 */
|
|
.isr_bit = 1, /* ARM1 */
|
|
};
|
|
|
|
static const struct rcar_sysc_ch r8a7779_ch_cpu2 = {
|
|
.chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
|
|
.chan_bit = 2, /* ARM2 */
|
|
.isr_bit = 2, /* ARM2 */
|
|
};
|
|
|
|
static const struct rcar_sysc_ch r8a7779_ch_cpu3 = {
|
|
.chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
|
|
.chan_bit = 3, /* ARM3 */
|
|
.isr_bit = 3, /* ARM3 */
|
|
};
|
|
|
|
static const struct rcar_sysc_ch * const r8a7779_ch_cpu[4] = {
|
|
[1] = &r8a7779_ch_cpu1,
|
|
[2] = &r8a7779_ch_cpu2,
|
|
[3] = &r8a7779_ch_cpu3,
|
|
};
|
|
|
|
static int r8a7779_platform_cpu_kill(unsigned int cpu)
|
|
{
|
|
const struct rcar_sysc_ch *ch = NULL;
|
|
int ret = -EIO;
|
|
|
|
cpu = cpu_logical_map(cpu);
|
|
|
|
if (cpu < ARRAY_SIZE(r8a7779_ch_cpu))
|
|
ch = r8a7779_ch_cpu[cpu];
|
|
|
|
if (ch)
|
|
ret = rcar_sysc_power_down(ch);
|
|
|
|
return ret ? ret : 1;
|
|
}
|
|
|
|
static int r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle)
|
|
{
|
|
const struct rcar_sysc_ch *ch = NULL;
|
|
unsigned int lcpu = cpu_logical_map(cpu);
|
|
int ret;
|
|
|
|
if (lcpu < ARRAY_SIZE(r8a7779_ch_cpu))
|
|
ch = r8a7779_ch_cpu[lcpu];
|
|
|
|
if (ch)
|
|
ret = rcar_sysc_power_up(ch);
|
|
else
|
|
ret = -EIO;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus)
|
|
{
|
|
/* Map the reset vector (in headsmp-scu.S, headsmp.S) */
|
|
__raw_writel(__pa(shmobile_boot_vector), AVECR);
|
|
shmobile_boot_fn = virt_to_phys(shmobile_boot_scu);
|
|
shmobile_boot_arg = (unsigned long)shmobile_scu_base;
|
|
|
|
/* setup r8a7779 specific SCU bits */
|
|
shmobile_scu_base = IOMEM(R8A7779_SCU_BASE);
|
|
shmobile_smp_scu_prepare_cpus(max_cpus);
|
|
|
|
r8a7779_pm_init();
|
|
|
|
/* power off secondary CPUs */
|
|
r8a7779_platform_cpu_kill(1);
|
|
r8a7779_platform_cpu_kill(2);
|
|
r8a7779_platform_cpu_kill(3);
|
|
}
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
static int r8a7779_cpu_kill(unsigned int cpu)
|
|
{
|
|
if (shmobile_smp_scu_cpu_kill(cpu))
|
|
return r8a7779_platform_cpu_kill(cpu);
|
|
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_HOTPLUG_CPU */
|
|
|
|
struct smp_operations r8a7779_smp_ops __initdata = {
|
|
.smp_prepare_cpus = r8a7779_smp_prepare_cpus,
|
|
.smp_boot_secondary = r8a7779_boot_secondary,
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
.cpu_die = shmobile_smp_scu_cpu_die,
|
|
.cpu_kill = r8a7779_cpu_kill,
|
|
#endif
|
|
};
|