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ARM: EXYNOS: Use the cpu_pm notifier for pm 

Use the cpu_pm_enter/exit notifier to group some pm code inside the
pm file.

The save and restore code is duplicated across pm.c and cpuidle.c. By
using the cpu_pm notifier, we can factor out the routine.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
This commit is contained in:
Daniel Lezcano 2014-05-09 06:43:27 +09:00 committed by Kukjin Kim
parent 9bd5544af8
commit 85f9f90808
2 changed files with 27 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
arch/arm/mach-exynos/cpuidle.c
View File

@ -47,26 +47,6 @@ static void exynos_set_wakeupmask(void)
__raw_writel(0x0000ff3e, S5P_WAKEUP_MASK);
}
static unsigned int g_pwr_ctrl, g_diag_reg;
static void save_cpu_arch_register(void)
{
/*read power control register*/
asm("mrc p15, 0, %0, c15, c0, 0" : "=r"(g_pwr_ctrl) : : "cc");
/*read diagnostic register*/
asm("mrc p15, 0, %0, c15, c0, 1" : "=r"(g_diag_reg) : : "cc");
return;
}
static void restore_cpu_arch_register(void)
{
/*write power control register*/
asm("mcr p15, 0, %0, c15, c0, 0" : : "r"(g_pwr_ctrl) : "cc");
/*write diagnostic register*/
asm("mcr p15, 0, %0, c15, c0, 1" : : "r"(g_diag_reg) : "cc");
return;
}
static int idle_finisher(unsigned long flags)
{
exynos_set_wakeupmask();
@ -88,8 +68,6 @@ static int exynos_enter_core0_aftr(struct cpuidle_device *dev,
{
unsigned long tmp;
save_cpu_arch_register();
/* Setting Central Sequence Register for power down mode */
tmp = __raw_readl(S5P_CENTRAL_SEQ_CONFIGURATION);
tmp &= ~S5P_CENTRAL_LOWPWR_CFG;
@ -104,8 +82,6 @@ static int exynos_enter_core0_aftr(struct cpuidle_device *dev,
#endif
cpu_pm_exit();
restore_cpu_arch_register();
/*
* If PMU failed while entering sleep mode, WFI will be
* ignored by PMU and then exiting cpu_do_idle().

27
arch/arm/mach-exynos/pm.c
View File

@ -16,6 +16,7 @@
#include <linux/init.h>
#include <linux/suspend.h>
#include <linux/syscore_ops.h>
#include <linux/cpu_pm.h>
#include <linux/io.h>
#include <linux/irqchip/arm-gic.h>
#include <linux/err.h>
@ -387,10 +388,36 @@ static const struct platform_suspend_ops exynos_suspend_ops = {
.valid = suspend_valid_only_mem,
};
static int exynos_cpu_pm_notifier(struct notifier_block *self,
unsigned long cmd, void *v)
{
int cpu = smp_processor_id();
switch (cmd) {
case CPU_PM_ENTER:
if (cpu == 0)
exynos_cpu_save_register();
break;
case CPU_PM_EXIT:
if (cpu == 0)
exynos_cpu_restore_register();
break;
}
return NOTIFY_OK;
}
static struct notifier_block exynos_cpu_pm_notifier_block = {
.notifier_call = exynos_cpu_pm_notifier,
};
void __init exynos_pm_init(void)
{
u32 tmp;
cpu_pm_register_notifier(&exynos_cpu_pm_notifier_block);
/* Platform-specific GIC callback */
gic_arch_extn.irq_set_wake = exynos_irq_set_wake;