Add cpuidle driver for imx5 platform.
Signed-off-by: Robert Lee rob.lee@linaro.org --- arch/arm/mach-imx/pm-imx5.c | 44 ++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 41 insertions(+), 3 deletions(-)
diff --git a/arch/arm/mach-imx/pm-imx5.c b/arch/arm/mach-imx/pm-imx5.c index 6e62d79..966c71b 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, +}; + int __init imx5_pm_init(void) { int ret; @@ -160,5 +198,5 @@ int __init imx5_pm_init(void) /* Set the registers to the default cpu idle state. */ mx5_cpu_lp_set(IMX5_DEFAULT_CPU_IDLE_STATE);
- return 0; + return imx_cpuidle_init(&imx5_cpuidle_driver); }