mirror of
https://github.com/torvalds/linux.git
synced 2024-11-07 20:51:47 +00:00
5489cde560
Remove sh73a0 specific ->smp_init_cpus() callback and instead of relying on shmobile_smp_init_cpus() simply use DT for CPU core information. This assumes that DT_MACHINE_START is used which is the case when AG5EVM and Kota2 are removed. Signed-off-by: Magnus Damm <damm@opensource.se> Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
125 lines
3.3 KiB
C
125 lines
3.3 KiB
C
/*
|
|
* SMP support for R-Mobile / SH-Mobile - sh73a0 portion
|
|
*
|
|
* Copyright (C) 2010 Magnus Damm
|
|
* Copyright (C) 2010 Takashi Yoshii
|
|
*
|
|
* 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 <asm/cacheflush.h>
|
|
#include <asm/smp_plat.h>
|
|
#include <mach/sh73a0.h>
|
|
#include <asm/smp_scu.h>
|
|
#include <asm/smp_twd.h>
|
|
|
|
#define WUPCR IOMEM(0xe6151010)
|
|
#define SRESCR IOMEM(0xe6151018)
|
|
#define PSTR IOMEM(0xe6151040)
|
|
#define SBAR IOMEM(0xe6180020)
|
|
#define APARMBAREA IOMEM(0xe6f10020)
|
|
|
|
#define PSTR_SHUTDOWN_MODE 3
|
|
|
|
#define SH73A0_SCU_BASE 0xf0000000
|
|
|
|
#ifdef CONFIG_HAVE_ARM_TWD
|
|
static DEFINE_TWD_LOCAL_TIMER(twd_local_timer, SH73A0_SCU_BASE + 0x600, 29);
|
|
void __init sh73a0_register_twd(void)
|
|
{
|
|
twd_local_timer_register(&twd_local_timer);
|
|
}
|
|
#endif
|
|
|
|
static int __cpuinit sh73a0_boot_secondary(unsigned int cpu, struct task_struct *idle)
|
|
{
|
|
cpu = cpu_logical_map(cpu);
|
|
|
|
if (((__raw_readl(PSTR) >> (4 * cpu)) & 3) == 3)
|
|
__raw_writel(1 << cpu, WUPCR); /* wake up */
|
|
else
|
|
__raw_writel(1 << cpu, SRESCR); /* reset */
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus)
|
|
{
|
|
/* setup sh73a0 specific SCU base */
|
|
shmobile_scu_base = IOMEM(SH73A0_SCU_BASE);
|
|
scu_enable(shmobile_scu_base);
|
|
|
|
/* Map the reset vector (in headsmp-scu.S, headsmp.S) */
|
|
__raw_writel(0, APARMBAREA); /* 4k */
|
|
__raw_writel(__pa(shmobile_boot_vector), SBAR);
|
|
shmobile_boot_fn = virt_to_phys(shmobile_boot_scu);
|
|
shmobile_boot_arg = (unsigned long)shmobile_scu_base;
|
|
|
|
/* enable cache coherency on booting CPU */
|
|
scu_power_mode(shmobile_scu_base, SCU_PM_NORMAL);
|
|
}
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
static int sh73a0_cpu_kill(unsigned int cpu)
|
|
{
|
|
|
|
int k;
|
|
u32 pstr;
|
|
|
|
/*
|
|
* wait until the power status register confirms the shutdown of the
|
|
* offline target
|
|
*/
|
|
for (k = 0; k < 1000; k++) {
|
|
pstr = (__raw_readl(PSTR) >> (4 * cpu)) & 3;
|
|
if (pstr == PSTR_SHUTDOWN_MODE)
|
|
return 1;
|
|
|
|
mdelay(1);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void sh73a0_cpu_die(unsigned int cpu)
|
|
{
|
|
/* Set power off mode. This takes the CPU out of the MP cluster */
|
|
scu_power_mode(shmobile_scu_base, SCU_PM_POWEROFF);
|
|
|
|
/* Enter shutdown mode */
|
|
cpu_do_idle();
|
|
}
|
|
|
|
static int sh73a0_cpu_disable(unsigned int cpu)
|
|
{
|
|
return 0; /* CPU0 and CPU1 supported */
|
|
}
|
|
#endif /* CONFIG_HOTPLUG_CPU */
|
|
|
|
struct smp_operations sh73a0_smp_ops __initdata = {
|
|
.smp_prepare_cpus = sh73a0_smp_prepare_cpus,
|
|
.smp_boot_secondary = sh73a0_boot_secondary,
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
.cpu_kill = sh73a0_cpu_kill,
|
|
.cpu_die = sh73a0_cpu_die,
|
|
.cpu_disable = sh73a0_cpu_disable,
|
|
#endif
|
|
};
|