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Diffstat (limited to 'arch/arm/mach-exynos/cpuidle.c')
-rw-r--r--arch/arm/mach-exynos/cpuidle.c151
1 files changed, 147 insertions, 4 deletions
diff --git a/arch/arm/mach-exynos/cpuidle.c b/arch/arm/mach-exynos/cpuidle.c
index 4ebb382..33ab4e7 100644
--- a/arch/arm/mach-exynos/cpuidle.c
+++ b/arch/arm/mach-exynos/cpuidle.c
@@ -11,25 +11,53 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/cpuidle.h>
+#include <linux/cpu_pm.h>
#include <linux/io.h>
#include <linux/export.h>
#include <linux/time.h>
#include <asm/proc-fns.h>
+#include <asm/smp_scu.h>
+#include <asm/suspend.h>
+#include <asm/unified.h>
+#include <mach/regs-pmu.h>
+#include <mach/pmu.h>
+
+#include <plat/cpu.h>
+
+#define REG_DIRECTGO_ADDR (samsung_rev() == EXYNOS4210_REV_1_1 ? \
+ S5P_INFORM7 : (samsung_rev() == EXYNOS4210_REV_1_0 ? \
+ (S5P_VA_SYSRAM + 0x24) : S5P_INFORM0))
+#define REG_DIRECTGO_FLAG (samsung_rev() == EXYNOS4210_REV_1_1 ? \
+ S5P_INFORM6 : (samsung_rev() == EXYNOS4210_REV_1_0 ? \
+ (S5P_VA_SYSRAM + 0x20) : S5P_INFORM1))
+
+#define S5P_CHECK_AFTR 0xFCBA0D10
static int exynos4_enter_idle(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index);
+static int exynos4_enter_lowpower(struct cpuidle_device *dev,
+ struct cpuidle_driver *drv,
+ int index);
-static struct cpuidle_state exynos4_cpuidle_set[] = {
+static struct cpuidle_state exynos4_cpuidle_set[] __initdata = {
[0] = {
.enter = exynos4_enter_idle,
.exit_latency = 1,
.target_residency = 100000,
.flags = CPUIDLE_FLAG_TIME_VALID,
- .name = "IDLE",
+ .name = "C0",
.desc = "ARM clock gating(WFI)",
},
+ [1] = {
+ .enter = exynos4_enter_lowpower,
+ .exit_latency = 300,
+ .target_residency = 100000,
+ .flags = CPUIDLE_FLAG_TIME_VALID,
+ .name = "C1",
+ .desc = "ARM power down",
+ },
};
static DEFINE_PER_CPU(struct cpuidle_device, exynos4_cpuidle_device);
@@ -39,9 +67,102 @@ static struct cpuidle_driver exynos4_idle_driver = {
.owner = THIS_MODULE,
};
+/* Ext-GIC nIRQ/nFIQ is the only wakeup source in AFTR */
+static void exynos4_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)
+{
+ cpu_do_idle();
+ return 1;
+}
+
+static int exynos4_enter_core0_aftr(struct cpuidle_device *dev,
+ struct cpuidle_driver *drv,
+ int index)
+{
+ struct timeval before, after;
+ int idle_time;
+ unsigned long tmp;
+
+ local_irq_disable();
+ do_gettimeofday(&before);
+
+ exynos4_set_wakeupmask();
+
+ /* Set value of power down register for aftr mode */
+ exynos4_sys_powerdown_conf(SYS_AFTR);
+
+ __raw_writel(virt_to_phys(s3c_cpu_resume), REG_DIRECTGO_ADDR);
+ __raw_writel(S5P_CHECK_AFTR, REG_DIRECTGO_FLAG);
+
+ save_cpu_arch_register();
+
+ /* Setting Central Sequence Register for power down mode */
+ tmp = __raw_readl(S5P_CENTRAL_SEQ_CONFIGURATION);
+ tmp &= ~S5P_CENTRAL_LOWPWR_CFG;
+ __raw_writel(tmp, S5P_CENTRAL_SEQ_CONFIGURATION);
+
+ cpu_pm_enter();
+ cpu_suspend(0, idle_finisher);
+
+#ifdef CONFIG_SMP
+ scu_enable(S5P_VA_SCU);
+#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().
+ * S5P_CENTRAL_LOWPWR_CFG bit will not be set automatically
+ * in this situation.
+ */
+ tmp = __raw_readl(S5P_CENTRAL_SEQ_CONFIGURATION);
+ if (!(tmp & S5P_CENTRAL_LOWPWR_CFG)) {
+ tmp |= S5P_CENTRAL_LOWPWR_CFG;
+ __raw_writel(tmp, S5P_CENTRAL_SEQ_CONFIGURATION);
+ }
+
+ /* Clear wakeup state register */
+ __raw_writel(0x0, S5P_WAKEUP_STAT);
+
+ do_gettimeofday(&after);
+
+ local_irq_enable();
+ idle_time = (after.tv_sec - before.tv_sec) * USEC_PER_SEC +
+ (after.tv_usec - before.tv_usec);
+
+ dev->last_residency = idle_time;
+ return index;
+}
+
static int exynos4_enter_idle(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
- int index)
+ int index)
{
struct timeval before, after;
int idle_time;
@@ -60,6 +181,22 @@ static int exynos4_enter_idle(struct cpuidle_device *dev,
return index;
}
+static int exynos4_enter_lowpower(struct cpuidle_device *dev,
+ struct cpuidle_driver *drv,
+ int index)
+{
+ int new_index = index;
+
+ /* This mode only can be entered when other core's are offline */
+ if (num_online_cpus() > 1)
+ new_index = drv->safe_state_index;
+
+ if (new_index == 0)
+ return exynos4_enter_idle(dev, drv, new_index);
+ else
+ return exynos4_enter_core0_aftr(dev, drv, new_index);
+}
+
static int __init exynos4_init_cpuidle(void)
{
int i, max_cpuidle_state, cpu_id;
@@ -74,19 +211,25 @@ static int __init exynos4_init_cpuidle(void)
memcpy(&drv->states[i], &exynos4_cpuidle_set[i],
sizeof(struct cpuidle_state));
}
+ drv->safe_state_index = 0;
cpuidle_register_driver(&exynos4_idle_driver);
for_each_cpu(cpu_id, cpu_online_mask) {
device = &per_cpu(exynos4_cpuidle_device, cpu_id);
device->cpu = cpu_id;
- device->state_count = drv->state_count;
+ if (cpu_id == 0)
+ device->state_count = (sizeof(exynos4_cpuidle_set) /
+ sizeof(struct cpuidle_state));
+ else
+ device->state_count = 1; /* Support IDLE only */
if (cpuidle_register_device(device)) {
printk(KERN_ERR "CPUidle register device failed\n,");
return -EIO;
}
}
+
return 0;
}
device_initcall(exynos4_init_cpuidle);