Add cpuidle driver for imx5 platform.
Signed-off-by: Robert Lee <rob....@linaro.org>
---
arch/arm/mach-imx/pm-imx5.c | 43 +++++++++++++++++++++++++++++++++++++++++--
1 file changed, 41 insertions(+), 2 deletions(-)
diff --git a/arch/arm/mach-imx/pm-imx5.c b/arch/arm/mach-imx/pm-imx5.c
index b3dcd8e..19621ed1 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;
}
--
1.7.10
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