gpio/omap: use pm-runtime framework

Call runtime pm APIs pm_runtime_get_sync() and pm_runtime_put()
for enabling/disabling clocks appropriately. Remove syscore_ops and
instead use SET_RUNTIME_PM_OPS macro.

There is no more need to call omap_device_disable_idle_on_suspend
since driver is PM runtime adapted now.

Signed-off-by: Charulatha V <charu@ti.com>
Signed-off-by: Tarun Kanti DebBarma <tarun.kanti@ti.com>
Reviewed-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>

1 files changed, 44 insertions, 24 deletions

diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
index 951d7843581..7e1e50c23f9 100644
--- a/drivers/gpio/gpio-omap.c
+++ b/drivers/gpio/gpio-omap.c
@@ -21,6 +21,7 @@
 #include <linux/io.h>
 #include <linux/slab.h>
 #include <linux/pm_runtime.h>
+#include <linux/pm.h>
 
 #include <mach/hardware.h>
 #include <asm/irq.h>
@@ -483,8 +484,14 @@ static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
         struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
         unsigned long flags;
 
-        spin_lock_irqsave(&bank->lock, flags);
+        /*
+         * If this is the first gpio_request for the bank,
+         * enable the bank module.
+         */
+        if (!bank->mod_usage)
+                pm_runtime_get_sync(bank->dev);
 
+        spin_lock_irqsave(&bank->lock, flags);
         /* Set trigger to none. You need to enable the desired trigger with
          * request_irq() or set_irq_type().
          */
@@ -540,6 +547,13 @@ static void omap_gpio_free(struct gpio_chip *chip, unsigned offset)
 
         _reset_gpio(bank, bank->chip.base + offset);
         spin_unlock_irqrestore(&bank->lock, flags);
+
+        /*
+         * If this is the last gpio to be freed in the bank,
+         * disable the bank module.
+         */
+        if (!bank->mod_usage)
+                pm_runtime_put(bank->dev);
 }
 
 /*
@@ -565,6 +579,7 @@ static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
 
         bank = irq_get_handler_data(irq);
         isr_reg = bank->base + bank->regs->irqstatus;
+        pm_runtime_get_sync(bank->dev);
 
         if (WARN_ON(!isr_reg))
                 goto exit;
@@ -625,6 +640,7 @@ static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
 exit:
         if (!unmasked)
                 chained_irq_exit(chip, desc);
+        pm_runtime_put(bank->dev);
 }
 
 static void gpio_irq_shutdown(struct irq_data *d)
@@ -1037,6 +1053,7 @@ static int __devinit omap_gpio_probe(struct platform_device *pdev)
         }
 
         pm_runtime_enable(bank->dev);
+        pm_runtime_irq_safe(bank->dev);
         pm_runtime_get_sync(bank->dev);
 
         if (bank->is_mpuio)
@@ -1046,6 +1063,8 @@ static int __devinit omap_gpio_probe(struct platform_device *pdev)
         omap_gpio_chip_init(bank);
         omap_gpio_show_rev(bank);
 
+        pm_runtime_put(bank->dev);
+
         list_add_tail(&bank->node, &omap_gpio_list);
 
         return ret;
@@ -1056,7 +1075,10 @@ err_exit:
         return ret;
 }
 
-static int omap_gpio_suspend(void)
+#ifdef CONFIG_ARCH_OMAP2PLUS
+
+#if defined(CONFIG_PM_SLEEP)
+static int omap_gpio_suspend(struct device *dev)
 {
         struct gpio_bank *bank;
 
@@ -1080,7 +1102,7 @@ static int omap_gpio_suspend(void)
         return 0;
 }
 
-static void omap_gpio_resume(void)
+static int omap_gpio_resume(struct device *dev)
 {
         struct gpio_bank *bank;
 
@@ -1089,21 +1111,17 @@ static void omap_gpio_resume(void)
                 unsigned long flags;
 
                 if (!bank->regs->wkup_en)
-                        return;
+                        return 0;
 
                 spin_lock_irqsave(&bank->lock, flags);
                 _gpio_rmw(base, bank->regs->wkup_en, 0xffffffff, 0);
                 _gpio_rmw(base, bank->regs->wkup_en, bank->saved_wakeup, 1);
                 spin_unlock_irqrestore(&bank->lock, flags);
         }
-}
-
-static struct syscore_ops omap_gpio_syscore_ops = {
-        .suspend        = omap_gpio_suspend,
-        .resume         = omap_gpio_resume,
-};
 
-#ifdef CONFIG_ARCH_OMAP2PLUS
+        return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
 
 static void omap_gpio_save_context(struct gpio_bank *bank);
 static void omap_gpio_restore_context(struct gpio_bank *bank);
@@ -1145,11 +1163,15 @@ void omap2_gpio_prepare_for_idle(int off_mode)
                 __raw_writel(l2, bank->base + bank->regs->risingdetect);
 
 save_gpio_context:
+
                 if (bank->get_context_loss_count)
                         bank->context_loss_count =
                                 bank->get_context_loss_count(bank->dev);
 
                 omap_gpio_save_context(bank);
+
+                if (!pm_runtime_suspended(bank->dev))
+                        pm_runtime_put(bank->dev);
         }
 }
 
@@ -1168,6 +1190,9 @@ void omap2_gpio_resume_after_idle(void)
                 for (j = 0; j < hweight_long(bank->dbck_enable_mask); j++)
                         clk_enable(bank->dbck);
 
+                if (pm_runtime_suspended(bank->dev))
+                        pm_runtime_get_sync(bank->dev);
+
                 if (bank->get_context_loss_count) {
                         context_lost_cnt_after =
                                 bank->get_context_loss_count(bank->dev);
@@ -1274,12 +1299,20 @@ static void omap_gpio_restore_context(struct gpio_bank *bank)
                                 bank->base + bank->regs->fallingdetect);
         __raw_writel(bank->context.dataout, bank->base + bank->regs->dataout);
 }
+#else
+#define omap_gpio_suspend NULL
+#define omap_gpio_resume NULL
 #endif
 
+static const struct dev_pm_ops gpio_pm_ops = {
+        SET_SYSTEM_SLEEP_PM_OPS(omap_gpio_suspend, omap_gpio_resume)
+};
+
 static struct platform_driver omap_gpio_driver = {
         .probe          = omap_gpio_probe,
         .driver         = {
                 .name   = "omap_gpio",
+                .pm     = &gpio_pm_ops,
         },
 };
 
@@ -1293,16 +1326,3 @@ static int __init omap_gpio_drv_reg(void)
         return platform_driver_register(&omap_gpio_driver);
 }
 postcore_initcall(omap_gpio_drv_reg);
-
-static int __init omap_gpio_sysinit(void)
-{
-
-#if defined(CONFIG_ARCH_OMAP16XX) || defined(CONFIG_ARCH_OMAP2PLUS)
-        if (cpu_is_omap16xx() || cpu_class_is_omap2())
-                register_syscore_ops(&omap_gpio_syscore_ops);
-#endif
-
-        return 0;
-}
-
-arch_initcall(omap_gpio_sysinit);