ARM: imx: Add imx5 cpuidle

Add cpuidle driver for imx5 platform.

Signed-off-by: Robert Lee <rob.lee@linaro.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 41 insertions, 2 deletions

diff --git a/arch/arm/mach-imx/pm-imx5.c b/arch/arm/mach-imx/pm-imx5.c
index b3dcd8e50d5..19621ed1ffa 100644
--- a/arch/arm/mach-imx/pm-imx5.c
+++ b/arch/arm/mach-imx/pm-imx5.c
@@ -12,10 +12,12 @@
 #include <linux/clk.h>
 #include <linux/io.h>
 #include <linux/err.h>
+#include <linux/export.h>
 #include <asm/cacheflush.h>
 #include <asm/system_misc.h>
 #include <asm/tlbflush.h>
 #include <mach/common.h>
+#include <mach/cpuidle.h>
 #include <mach/hardware.h>
 #include "crm-regs-imx5.h"
 
@@ -134,12 +136,48 @@ static const struct platform_suspend_ops mx5_suspend_ops = {
         .enter = mx5_suspend_enter,
 };
 
-static void imx5_pm_idle(void)
+static inline int imx5_cpu_do_idle(void)
 {
-        if (likely(!tzic_enable_wake()))
+        int ret = tzic_enable_wake();
+
+        if (likely(!ret))
                 cpu_do_idle();
+
+        return ret;
+}
+
+static void imx5_pm_idle(void)
+{
+        imx5_cpu_do_idle();
+}
+
+static int imx5_cpuidle_enter(struct cpuidle_device *dev,
+                                struct cpuidle_driver *drv, int idx)
+{
+        int ret;
+
+        ret = imx5_cpu_do_idle();
+        if (ret < 0)
+                return ret;
+
+        return idx;
 }
 
+static struct cpuidle_driver imx5_cpuidle_driver = {
+        .name                   = "imx5_cpuidle",
+        .owner                  = THIS_MODULE,
+        .en_core_tk_irqen       = 1,
+        .states[0]      = {
+                .enter                  = imx5_cpuidle_enter,
+                .exit_latency           = 2,
+                .target_residency       = 1,
+                .flags                  = CPUIDLE_FLAG_TIME_VALID,
+                .name                   = "IMX5 SRPG",
+                .desc                   = "CPU state retained,powered off",
+        },
+        .state_count            = 1,
+};
+
 static int __init imx5_pm_common_init(void)
 {
         int ret;
@@ -157,6 +195,7 @@ static int __init imx5_pm_common_init(void)
         /* Set the registers to the default cpu idle state. */
         mx5_cpu_lp_set(IMX5_DEFAULT_CPU_IDLE_STATE);
 
+        imx_cpuidle_init(&imx5_cpuidle_driver);
         return 0;
 }