sh: MTU2: Basic runtime PM support

[linux-2.6-block.git] / drivers / clocksource / sh_mtu2.c

diff --git a/drivers/clocksource/sh_mtu2.c b/drivers/clocksource/sh_mtu2.c
index d9b76ca64a611327c0ea79d979482f638e3c14d3..c5eea858054aa4e67195edf69c1b1951fa8cf11c 100644 (file)
--- a/drivers/clocksource/sh_mtu2.c
+++ b/drivers/clocksource/sh_mtu2.c
@@ -32,6 +32,7 @@
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/pm_domain.h>
+#include <linux/pm_runtime.h>
 
 struct sh_mtu2_priv {
        void __iomem *mapbase;
@@ -123,6 +124,9 @@ static int sh_mtu2_enable(struct sh_mtu2_priv *p)
 {
        int ret;
 
+       pm_runtime_get_sync(&p->pdev->dev);
+       dev_pm_syscore_device(&p->pdev->dev, true);
+
        /* enable clock */
        ret = clk_enable(p->clk);
        if (ret) {
@@ -157,6 +161,9 @@ static void sh_mtu2_disable(struct sh_mtu2_priv *p)
 
        /* stop clock */
        clk_disable(p->clk);
+
+       dev_pm_syscore_device(&p->pdev->dev, false);
+       pm_runtime_put(&p->pdev->dev);
 }
 
 static irqreturn_t sh_mtu2_interrupt(int irq, void *dev_id)
@@ -208,6 +215,16 @@ static void sh_mtu2_clock_event_mode(enum clock_event_mode mode,
        }
 }
 
+static void sh_mtu2_clock_event_suspend(struct clock_event_device *ced)
+{
+       pm_genpd_syscore_poweroff(&ced_to_sh_mtu2(ced)->pdev->dev);
+}
+
+static void sh_mtu2_clock_event_resume(struct clock_event_device *ced)
+{
+       pm_genpd_syscore_poweron(&ced_to_sh_mtu2(ced)->pdev->dev);
+}
+
 static void sh_mtu2_register_clockevent(struct sh_mtu2_priv *p,
                                       char *name, unsigned long rating)
 {
@@ -221,6 +238,8 @@ static void sh_mtu2_register_clockevent(struct sh_mtu2_priv *p,
        ced->rating = rating;
        ced->cpumask = cpumask_of(0);
        ced->set_mode = sh_mtu2_clock_event_mode;
+       ced->suspend = sh_mtu2_clock_event_suspend;
+       ced->resume = sh_mtu2_clock_event_resume;
 
        dev_info(&p->pdev->dev, "used for clock events\n");
        clockevents_register_device(ced);
@@ -305,14 +324,17 @@ static int sh_mtu2_setup(struct sh_mtu2_priv *p, struct platform_device *pdev)
 static int __devinit sh_mtu2_probe(struct platform_device *pdev)
 {
        struct sh_mtu2_priv *p = platform_get_drvdata(pdev);
+       struct sh_timer_config *cfg = pdev->dev.platform_data;
        int ret;
 
-       if (!is_early_platform_device(pdev))
-               pm_genpd_dev_always_on(&pdev->dev, true);
+       if (!is_early_platform_device(pdev)) {
+               pm_runtime_set_active(&pdev->dev);
+               pm_runtime_enable(&pdev->dev);
+       }
 
        if (p) {
                dev_info(&pdev->dev, "kept as earlytimer\n");
-               return 0;
+               goto out;
        }
 
        p = kmalloc(sizeof(*p), GFP_KERNEL);
@@ -325,8 +347,19 @@ static int __devinit sh_mtu2_probe(struct platform_device *pdev)
        if (ret) {
                kfree(p);
                platform_set_drvdata(pdev, NULL);
+               pm_runtime_idle(&pdev->dev);
+               return ret;
        }
-       return ret;
+       if (is_early_platform_device(pdev))
+               return 0;
+
+ out:
+       if (cfg->clockevent_rating)
+               pm_runtime_irq_safe(&pdev->dev);
+       else
+               pm_runtime_idle(&pdev->dev);
+
+       return 0;
 }
 
 static int __devexit sh_mtu2_remove(struct platform_device *pdev)