ARM: OMAP: dmtimer: pm_runtime support

Add pm_runtime feature to dmtimer whereby *_runtime_get_sync()
is called within omap_dm_timer_enable(), pm_runtime_put()
is called in omap_dm_timer_disable(). In addition to calling
pm_runtime_enable, we are calling pm_runtime_irq_safe so that
they can be called from interrupt context.

Signed-off-by: Tarun Kanti DebBarma <tarun.kanti@ti.com>
Signed-off-by: Partha Basak <p-basak2@ti.com>
Reviewed-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Cousson, Benoit <b-cousson@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

2 files changed, 10 insertions, 24 deletions

diff --git a/arch/arm/plat-omap/dmtimer.c b/arch/arm/plat-omap/dmtimer.c
index 601920860597..ac904c2ea058 100644
--- a/arch/arm/plat-omap/dmtimer.c
+++ b/arch/arm/plat-omap/dmtimer.c
@@ -38,6 +38,7 @@
 #include <linux/io.h>
 #include <linux/slab.h>
 #include <linux/err.h>
+#include <linux/pm_runtime.h>
 
 #include <plat/dmtimer.h>
 
@@ -202,33 +203,13 @@ EXPORT_SYMBOL_GPL(omap_dm_timer_free);
 
 void omap_dm_timer_enable(struct omap_dm_timer *timer)
 {
-        struct dmtimer_platform_data *pdata = timer->pdev->dev.platform_data;
-
-        if (timer->enabled)
-                return;
-
-        if (!pdata->needs_manual_reset) {
-                clk_enable(timer->fclk);
-                clk_enable(timer->iclk);
-        }
-
-        timer->enabled = 1;
+        pm_runtime_get_sync(&timer->pdev->dev);
 }
 EXPORT_SYMBOL_GPL(omap_dm_timer_enable);
 
 void omap_dm_timer_disable(struct omap_dm_timer *timer)
 {
-        struct dmtimer_platform_data *pdata = timer->pdev->dev.platform_data;
-
-        if (!timer->enabled)
-                return;
-
-        if (!pdata->needs_manual_reset) {
-                clk_disable(timer->iclk);
-                clk_disable(timer->fclk);
-        }
-
-        timer->enabled = 0;
+        pm_runtime_put(&timer->pdev->dev);
 }
 EXPORT_SYMBOL_GPL(omap_dm_timer_disable);
 
@@ -460,7 +441,7 @@ int omap_dm_timers_active(void)
         struct omap_dm_timer *timer;
 
         list_for_each_entry(timer, &omap_timer_list, node) {
-                if (!timer->enabled)
+                if (!timer->reserved)
                         continue;
 
                 if (omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG) &
@@ -530,6 +511,12 @@ static int __devinit omap_dm_timer_probe(struct platform_device *pdev)
         timer->irq = irq->start;
         timer->pdev = pdev;
 
+        /* Skip pm_runtime_enable for OMAP1 */
+        if (!pdata->needs_manual_reset) {
+                pm_runtime_enable(&pdev->dev);
+                pm_runtime_irq_safe(&pdev->dev);
+        }
+
         /* add the timer element to the list */
         spin_lock_irqsave(&dm_timer_lock, flags);
         list_add_tail(&timer->node, &omap_timer_list);
diff --git a/arch/arm/plat-omap/include/plat/dmtimer.h b/arch/arm/plat-omap/include/plat/dmtimer.h
index 2ac7538541b2..4e3a32609abf 100644
--- a/arch/arm/plat-omap/include/plat/dmtimer.h
+++ b/arch/arm/plat-omap/include/plat/dmtimer.h
@@ -243,7 +243,6 @@ struct omap_dm_timer {
 
         unsigned long rate;
         unsigned reserved:1;
-        unsigned enabled:1;
         unsigned posted:1;
         struct platform_device *pdev;
         struct list_head node;