146 lines
3.7 KiB
C
146 lines
3.7 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.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
#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 <mach/common.h>
|
|
#include <mach/pm-rcar.h>
|
|
#include <mach/r8a7779.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/smp_plat.h>
|
|
#include <asm/smp_scu.h>
|
|
#include <asm/smp_twd.h>
|
|
|
|
#define AVECR IOMEM(0xfe700040)
|
|
#define R8A7779_SCU_BASE 0xf0000000
|
|
|
|
static struct rcar_sysc_ch r8a7779_ch_cpu1 = {
|
|
.chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
|
|
.chan_bit = 1, /* ARM1 */
|
|
.isr_bit = 1, /* ARM1 */
|
|
};
|
|
|
|
static struct rcar_sysc_ch r8a7779_ch_cpu2 = {
|
|
.chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
|
|
.chan_bit = 2, /* ARM2 */
|
|
.isr_bit = 2, /* ARM2 */
|
|
};
|
|
|
|
static struct rcar_sysc_ch r8a7779_ch_cpu3 = {
|
|
.chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
|
|
.chan_bit = 3, /* ARM3 */
|
|
.isr_bit = 3, /* ARM3 */
|
|
};
|
|
|
|
static struct rcar_sysc_ch *r8a7779_ch_cpu[4] = {
|
|
[1] = &r8a7779_ch_cpu1,
|
|
[2] = &r8a7779_ch_cpu2,
|
|
[3] = &r8a7779_ch_cpu3,
|
|
};
|
|
|
|
#ifdef CONFIG_HAVE_ARM_TWD
|
|
static DEFINE_TWD_LOCAL_TIMER(twd_local_timer, R8A7779_SCU_BASE + 0x600, 29);
|
|
void __init r8a7779_register_twd(void)
|
|
{
|
|
twd_local_timer_register(&twd_local_timer);
|
|
}
|
|
#endif
|
|
|
|
static int r8a7779_platform_cpu_kill(unsigned int cpu)
|
|
{
|
|
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)
|
|
{
|
|
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;
|
|
}
|
|
|
|
static int r8a7779_cpu_disable(unsigned int cpu)
|
|
{
|
|
/* only CPU1->3 have power domains, do not allow hotplug of CPU0 */
|
|
return cpu == 0 ? -EPERM : 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_disable = r8a7779_cpu_disable,
|
|
.cpu_die = shmobile_smp_scu_cpu_die,
|
|
.cpu_kill = r8a7779_cpu_kill,
|
|
#endif
|
|
};
|