1 files changed, 147 insertions, 4 deletions

diff --git a/arch/arm/mach-exynos/cpuidle.c b/arch/arm/mach-exynos/cpuidle.c
index 4ebb382c5979..33ab4e7558af 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);