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ARM: shmobile: Use shared SCU CPU Hotplug code on sh73a0

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Update the sh73a0 specific CPU Hotplug code to make use of
the recently introduced shared SCU functions. The sh73a0
power control hardware relies on SCU_PM_POWEROFF with WFI
so the shared SCU code will as-is power down the hardware
as expected.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Magnus Damm 2013-07-31 16:07:59 +09:00 committed by Simon Horman
parent e7b1c96384
commit 352e57a3af
1 changed files with 3 additions and 38 deletions
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41
arch/arm/mach-shmobile/smp-sh73a0.c
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@ -20,14 +20,11 @@
#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_plat.h>
#include <asm/smp_twd.h>
#define WUPCR IOMEM(0xe6151010)
@ -36,8 +33,6 @@
#define SBAR IOMEM(0xe6180020)
#define APARMBAREA IOMEM(0xe6f10020)
#define PSTR_SHUTDOWN_MODE 3
#define SH73A0_SCU_BASE 0xf0000000
#ifdef CONFIG_HAVE_ARM_TWD
@ -77,36 +72,6 @@ static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus)
}
#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 */
@ -117,8 +82,8 @@ 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,
.cpu_die = shmobile_smp_scu_cpu_die,
.cpu_kill = shmobile_smp_scu_cpu_kill,
#endif
};