[v6,12/13] OMAP: GPIO: Use dev_pm_ops instead of sys_dev_class
diff mbox

Message ID 1284819353-8512-13-git-send-email-charu@ti.com
State Superseded
Delegated to: Kevin Hilman
Headers show

Commit Message

charu@ti.com Sept. 18, 2010, 2:15 p.m. UTC
None

Patch
diff mbox

diff --git a/arch/arm/plat-omap/gpio.c b/arch/arm/plat-omap/gpio.c
index aa0d510..1f07317 100644
--- a/arch/arm/plat-omap/gpio.c
+++ b/arch/arm/plat-omap/gpio.c
@@ -29,9 +29,6 @@ 
 #include <mach/irqs.h>
 #include <mach/gpio.h>
 #include <asm/mach/irq.h>
-#include <plat/powerdomain.h>
-
-static struct powerdomain *per_pwrdm;
 
 /*
  * OMAP1510 GPIO registers
@@ -171,11 +168,12 @@  struct gpio_bank {
 	u32 dbck_enable_mask;
 	struct device *dev;
 	struct omap_gpio_regs gpio_context;
+	struct powerdomain *pwrdm;
 	bool dbck_flag;
 };
 
-static void omap3_gpio_restore_context(void);
-static void omap3_gpio_save_context(void);
+static void omap_gpio_save_context(struct device *dev);
+static void omap_gpio_restore_context(struct device *dev);
 
 /*
  * TODO: Cleanup gpio_bank usage as it is having information
@@ -188,6 +186,8 @@  static int bank_width;
 /* TODO: Analyze removing gpio_bank_count usage from driver code */
 int gpio_bank_count;
 
+static void omap_gpio_mod_init(struct gpio_bank *bank, int id);
+
 static inline struct gpio_bank *get_gpio_bank(int gpio)
 {
 	if (cpu_is_omap15xx()) {
@@ -1039,6 +1039,20 @@  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;
 
+	/*
+	 * If this is the first gpio_request for the bank,
+	 * enable the bank module
+	 */
+	if (!bank->mod_usage) {
+		struct platform_device *pdev = to_platform_device(bank->dev);
+
+		pm_runtime_get_sync(bank->dev);
+
+		/* Initialize the gpio bank registers to init time value */
+		omap_gpio_mod_init(bank, pdev->id);
+	}
+	bank->mod_usage |= 1 << offset;
+
 	spin_lock_irqsave(&bank->lock, flags);
 
 	/* Set trigger to none. You need to enable the desired trigger with
@@ -1055,22 +1069,6 @@  static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
 		__raw_writel(__raw_readl(reg) | (1 << offset), reg);
 	}
 #endif
-	if (!cpu_class_is_omap1()) {
-		if (!bank->mod_usage) {
-			void __iomem *reg = bank->base;
-			u32 ctrl;
-
-			if (cpu_is_omap24xx() || cpu_is_omap34xx())
-				reg += OMAP24XX_GPIO_CTRL;
-			else if (cpu_is_omap44xx())
-				reg += OMAP4_GPIO_CTRL;
-			ctrl = __raw_readl(reg);
-			/* Module is enabled, clocks are not gated */
-			ctrl &= 0xFFFFFFFE;
-			__raw_writel(ctrl, reg);
-		}
-		bank->mod_usage |= 1 << offset;
-	}
 	spin_unlock_irqrestore(&bank->lock, flags);
 
 	return 0;
@@ -1103,24 +1101,32 @@  static void omap_gpio_free(struct gpio_chip *chip, unsigned offset)
 		__raw_writel(1 << offset, reg);
 	}
 #endif
-	if (!cpu_class_is_omap1()) {
-		bank->mod_usage &= ~(1 << offset);
-		if (!bank->mod_usage) {
-			void __iomem *reg = bank->base;
-			u32 ctrl;
+	_reset_gpio(bank, bank->chip.base + offset);
+	spin_unlock_irqrestore(&bank->lock, flags);
+
+	bank->mod_usage &= ~(1 << offset);
+	/*
+	 * If this is the last gpio to be freed in the bank,
+	 * disable the bank module
+	 */
+	if (!bank->mod_usage) {
+		void __iomem *reg = NULL;
+		u32 ctrl;
+
+		pm_runtime_put_sync(bank->dev);
 
-			if (cpu_is_omap24xx() || cpu_is_omap34xx())
-				reg += OMAP24XX_GPIO_CTRL;
-			else if (cpu_is_omap44xx())
-				reg += OMAP4_GPIO_CTRL;
+		if (bank->method == METHOD_GPIO_24XX)
+			reg = bank->base + OMAP24XX_GPIO_CTRL;
+		else if (bank->method == METHOD_GPIO_44XX)
+			reg = bank->base + OMAP4_GPIO_CTRL;
+
+		if (reg) {
 			ctrl = __raw_readl(reg);
 			/* Module is disabled, clocks are gated */
 			ctrl |= 1;
 			__raw_writel(ctrl, reg);
 		}
 	}
-	_reset_gpio(bank, bank->chip.base + offset);
-	spin_unlock_irqrestore(&bank->lock, flags);
 }
 
 /*
@@ -1569,9 +1575,6 @@  static inline int init_gpio_info(struct platform_device *pdev)
 static void omap_gpio_mod_init(struct gpio_bank *bank, int id)
 {
 	if (cpu_class_is_omap2()) {
-
-		per_pwrdm = pwrdm_lookup("per_pwrdm");
-
 		if (cpu_is_omap44xx()) {
 			__raw_writel(0xffffffff, bank->base +
 					OMAP4_GPIO_IRQSTATUSCLR0);
@@ -1710,6 +1713,7 @@  static int __devinit omap_gpio_probe(struct platform_device *pdev)
 	bank->dev = &pdev->dev;
 	bank->dbck_flag = pdata->gpio_attr->dbck_flag;
 	bank_width = pdata->gpio_attr->bank_width;
+	bank->pwrdm = pdata->pwrdm;
 
 	spin_lock_init(&bank->lock);
 
@@ -1729,7 +1733,6 @@  static int __devinit omap_gpio_probe(struct platform_device *pdev)
 	pm_runtime_enable(bank->dev);
 	pm_runtime_get_sync(bank->dev);
 
-	omap_gpio_mod_init(bank, id);
 	omap_gpio_chip_init(bank);
 
 	if (!gpio_init_done) {
@@ -1737,248 +1740,177 @@  static int __devinit omap_gpio_probe(struct platform_device *pdev)
 		gpio_init_done = 1;
 	}
 
+	pm_runtime_put_sync(bank->dev);
+
 	return 0;
 }
 
-#if defined(CONFIG_ARCH_OMAP16XX) || defined(CONFIG_ARCH_OMAP2PLUS)
-static int omap_gpio_suspend(struct sys_device *dev, pm_message_t mesg)
+static int omap_gpio_suspend(struct device *dev)
 {
-	int i;
+	struct platform_device *pdev = to_platform_device(dev);
+	void __iomem *wake_status;
+	void __iomem *wake_clear;
+	void __iomem *wake_set;
+	unsigned long flags;
+	struct gpio_bank *bank = &gpio_bank[pdev->id];
 
-	if (!cpu_class_is_omap2() && !cpu_is_omap16xx())
+	/* If the gpio bank is not used, do nothing */
+	if (!bank->mod_usage)
 		return 0;
 
-	for (i = 0; i < gpio_bank_count; i++) {
-		struct gpio_bank *bank = &gpio_bank[i];
-		void __iomem *wake_status;
-		void __iomem *wake_clear;
-		void __iomem *wake_set;
-		unsigned long flags;
+	if (strcmp(bank->pwrdm->name, "wkup_pwrdm"))
+		omap_gpio_save_context(dev);
 
-		switch (bank->method) {
-#ifdef CONFIG_ARCH_OMAP16XX
-		case METHOD_GPIO_1610:
-			wake_status = bank->base + OMAP1610_GPIO_WAKEUPENABLE;
-			wake_clear = bank->base + OMAP1610_GPIO_CLEAR_WAKEUPENA;
-			wake_set = bank->base + OMAP1610_GPIO_SET_WAKEUPENA;
-			break;
-#endif
-#if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
-		case METHOD_GPIO_24XX:
-			wake_status = bank->base + OMAP24XX_GPIO_WAKE_EN;
-			wake_clear = bank->base + OMAP24XX_GPIO_CLEARWKUENA;
-			wake_set = bank->base + OMAP24XX_GPIO_SETWKUENA;
-			break;
-#endif
-#ifdef CONFIG_ARCH_OMAP4
-		case METHOD_GPIO_44XX:
-			wake_status = bank->base + OMAP4_GPIO_IRQWAKEN0;
-			wake_clear = bank->base + OMAP4_GPIO_IRQWAKEN0;
-			wake_set = bank->base + OMAP4_GPIO_IRQWAKEN0;
-			break;
-#endif
-		default:
-			continue;
-		}
-
-		spin_lock_irqsave(&bank->lock, flags);
-		bank->saved_wakeup = __raw_readl(wake_status);
-		__raw_writel(0xffffffff, wake_clear);
-		__raw_writel(bank->suspend_wakeup, wake_set);
-		spin_unlock_irqrestore(&bank->lock, flags);
+	switch (bank->method) {
+	case METHOD_GPIO_1610:
+		wake_status = bank->base + OMAP1610_GPIO_WAKEUPENABLE;
+		wake_clear = bank->base + OMAP1610_GPIO_CLEAR_WAKEUPENA;
+		wake_set = bank->base + OMAP1610_GPIO_SET_WAKEUPENA;
+		break;
+	case METHOD_GPIO_24XX:
+		wake_status = bank->base + OMAP24XX_GPIO_WAKE_EN;
+		wake_clear = bank->base + OMAP24XX_GPIO_CLEARWKUENA;
+		wake_set = bank->base + OMAP24XX_GPIO_SETWKUENA;
+		break;
+	case METHOD_GPIO_44XX:
+		wake_status = bank->base + OMAP4_GPIO_IRQWAKEN0;
+		wake_clear = bank->base + OMAP4_GPIO_IRQWAKEN0;
+		wake_set = bank->base + OMAP4_GPIO_IRQWAKEN0;
+		break;
+	default:
+		return 0;
 	}
 
+	spin_lock_irqsave(&bank->lock, flags);
+	bank->saved_wakeup = __raw_readl(wake_status);
+	__raw_writel(0xffffffff, wake_clear);
+	__raw_writel(bank->suspend_wakeup, wake_set);
+	spin_unlock_irqrestore(&bank->lock, flags);
+
 	return 0;
 }
 
-static int omap_gpio_resume(struct sys_device *dev)
+static int omap_gpio_resume(struct device *dev)
 {
-	int i;
+	struct platform_device *pdev = to_platform_device(dev);
+	struct gpio_bank *bank = &gpio_bank[pdev->id];
+	void __iomem *wake_clear;
+	void __iomem *wake_set;
+	unsigned long flags;
 
-	if (!cpu_class_is_omap2() && !cpu_is_omap16xx())
+	/* If the gpio bank is not used, do nothing */
+	if (!bank->mod_usage)
 		return 0;
 
-	for (i = 0; i < gpio_bank_count; i++) {
-		struct gpio_bank *bank = &gpio_bank[i];
-		void __iomem *wake_clear;
-		void __iomem *wake_set;
-		unsigned long flags;
+	switch (bank->method) {
+	case METHOD_GPIO_1610:
+		wake_clear = bank->base + OMAP1610_GPIO_CLEAR_WAKEUPENA;
+		wake_set = bank->base + OMAP1610_GPIO_SET_WAKEUPENA;
+		break;
+	case METHOD_GPIO_24XX:
+		wake_clear = bank->base + OMAP24XX_GPIO_CLEARWKUENA;
+		wake_set = bank->base + OMAP24XX_GPIO_SETWKUENA;
+		break;
+	case METHOD_GPIO_44XX:
+		wake_clear = bank->base + OMAP4_GPIO_IRQWAKEN0;
+		wake_set = bank->base + OMAP4_GPIO_IRQWAKEN0;
+		break;
+	default:
+		return 0;
+	}
 
-		switch (bank->method) {
-#ifdef CONFIG_ARCH_OMAP16XX
-		case METHOD_GPIO_1610:
-			wake_clear = bank->base + OMAP1610_GPIO_CLEAR_WAKEUPENA;
-			wake_set = bank->base + OMAP1610_GPIO_SET_WAKEUPENA;
-			break;
-#endif
-#if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
-		case METHOD_GPIO_24XX:
-			wake_clear = bank->base + OMAP24XX_GPIO_CLEARWKUENA;
-			wake_set = bank->base + OMAP24XX_GPIO_SETWKUENA;
-			break;
-#endif
-#ifdef CONFIG_ARCH_OMAP4
-		case METHOD_GPIO_44XX:
-			wake_clear = bank->base + OMAP4_GPIO_IRQWAKEN0;
-			wake_set = bank->base + OMAP4_GPIO_IRQWAKEN0;
-			break;
-#endif
-		default:
-			continue;
-		}
+	spin_lock_irqsave(&bank->lock, flags);
+	__raw_writel(0xffffffff, wake_clear);
+	__raw_writel(bank->saved_wakeup, wake_set);
+	spin_unlock_irqrestore(&bank->lock, flags);
 
-		spin_lock_irqsave(&bank->lock, flags);
-		__raw_writel(0xffffffff, wake_clear);
-		__raw_writel(bank->saved_wakeup, wake_set);
-		spin_unlock_irqrestore(&bank->lock, flags);
-	}
+	if (strcmp(bank->pwrdm->name, "wkup_pwrdm"))
+		omap_gpio_restore_context(dev);
 
 	return 0;
 }
 
-static struct sysdev_class omap_gpio_sysclass = {
-	.name		= "gpio",
-	.suspend	= omap_gpio_suspend,
-	.resume		= omap_gpio_resume,
-};
-
-static struct sys_device omap_gpio_device = {
-	.id		= 0,
-	.cls		= &omap_gpio_sysclass,
-};
-
-#endif
-
-#ifdef CONFIG_ARCH_OMAP2PLUS
-
 static int workaround_enabled;
 
-void omap2_gpio_prepare_for_idle(void)
+static int gpio_bank_runtime_suspend(struct device *dev)
 {
-	int i, c = 0, min = 0;
-	int per_next_state;
+	struct platform_device *pdev = to_platform_device(dev);
+	struct gpio_bank *bank = &gpio_bank[pdev->id];
 
-	if (!per_pwrdm)
-		return;
+	if (bank->dbck_enable_mask)
+		clk_disable(bank->dbck);
 
-	per_next_state = pwrdm_read_next_pwrst(per_pwrdm);
-	if (per_next_state >= PWRDM_POWER_INACTIVE)
-		return;
+	if (!bank->pwrdm) {
+		int pwrdm_next_state;
+
+		pwrdm_next_state = pwrdm_read_next_pwrst(bank->pwrdm);
+		if (pwrdm_next_state > PWRDM_POWER_OFF)
+			return 0;
+	}
 
-	if (cpu_is_omap34xx())
-		min = 1;
+	/* If going to OFF, remove triggering for all
+	 * non-wakeup GPIOs.  Otherwise spurious IRQs will be
+	 * generated.  See OMAP2420 Errata item 1.101. */
+	if (!(bank->enabled_non_wakeup_gpios))
+		return 0;
 
-	workaround_enabled = 0;
-	for (i = min; i < gpio_bank_count; i++) {
-		struct gpio_bank *bank = &gpio_bank[i];
+	if (bank->method == METHOD_GPIO_24XX) {
 		u32 l1, l2;
 
-		if (bank->dbck_enable_mask)
-			clk_disable(bank->dbck);
+		bank->saved_datain = __raw_readl(bank->base +
+							OMAP24XX_GPIO_DATAIN);
+		l1 = __raw_readl(bank->base + OMAP24XX_GPIO_FALLINGDETECT);
+		l2 = __raw_readl(bank->base + OMAP24XX_GPIO_RISINGDETECT);
 
-		if (per_next_state > PWRDM_POWER_OFF)
-			continue;
+		bank->saved_fallingdetect = l1;
+		bank->saved_risingdetect = l2;
+		l1 &= ~bank->enabled_non_wakeup_gpios;
+		l2 &= ~bank->enabled_non_wakeup_gpios;
 
-		/* If going to OFF, remove triggering for all
-		 * non-wakeup GPIOs.  Otherwise spurious IRQs will be
-		 * generated.  See OMAP2420 Errata item 1.101. */
-		if (!(bank->enabled_non_wakeup_gpios))
-			continue;
+		__raw_writel(l1, bank->base + OMAP24XX_GPIO_FALLINGDETECT);
+		__raw_writel(l2, bank->base + OMAP24XX_GPIO_RISINGDETECT);
 
-		if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
-			bank->saved_datain = __raw_readl(bank->base +
-					OMAP24XX_GPIO_DATAIN);
-			l1 = __raw_readl(bank->base +
-					OMAP24XX_GPIO_FALLINGDETECT);
-			l2 = __raw_readl(bank->base +
-					OMAP24XX_GPIO_RISINGDETECT);
-		}
+	} else if (bank->method == METHOD_GPIO_44XX) {
+		u32 l1, l2;
 
-		if (cpu_is_omap44xx()) {
-			bank->saved_datain = __raw_readl(bank->base +
-						OMAP4_GPIO_DATAIN);
-			l1 = __raw_readl(bank->base +
-						OMAP4_GPIO_FALLINGDETECT);
-			l2 = __raw_readl(bank->base +
-						OMAP4_GPIO_RISINGDETECT);
-		}
+		bank->saved_datain = __raw_readl(bank->base +
+							OMAP4_GPIO_DATAIN);
+		l1 = __raw_readl(bank->base + OMAP4_GPIO_FALLINGDETECT);
+		l2 = __raw_readl(bank->base + OMAP4_GPIO_RISINGDETECT);
 
 		bank->saved_fallingdetect = l1;
 		bank->saved_risingdetect = l2;
 		l1 &= ~bank->enabled_non_wakeup_gpios;
 		l2 &= ~bank->enabled_non_wakeup_gpios;
 
-		if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
-			__raw_writel(l1, bank->base +
-					OMAP24XX_GPIO_FALLINGDETECT);
-			__raw_writel(l2, bank->base +
-					OMAP24XX_GPIO_RISINGDETECT);
-		}
-
-		if (cpu_is_omap44xx()) {
-			__raw_writel(l1, bank->base + OMAP4_GPIO_FALLINGDETECT);
-			__raw_writel(l2, bank->base + OMAP4_GPIO_RISINGDETECT);
-		}
-
-		c++;
+		__raw_writel(l1, bank->base + OMAP4_GPIO_FALLINGDETECT);
+		__raw_writel(l2, bank->base + OMAP4_GPIO_RISINGDETECT);
 	}
-	if (c)
-		workaround_enabled = 1;
 
-	if (cpu_is_omap34xx() && (per_next_state == PWRDM_POWER_OFF))
-		omap3_gpio_save_context();
+	workaround_enabled = 1;
+
+	return 0;
 }
 
-void omap2_gpio_resume_after_idle(void)
+static int gpio_bank_runtime_resume(struct device *dev)
 {
-	int i, min = 0;
-	int per_next_state;
-
-	if (!per_pwrdm)
-		return;
-
-	per_next_state = pwrdm_read_next_pwrst(per_pwrdm);
-	if (per_next_state >= PWRDM_POWER_INACTIVE)
-		return;
-
-	if (cpu_is_omap34xx() && (per_next_state == PWRDM_POWER_OFF)) {
-		int per_prev_state = pwrdm_read_prev_pwrst(per_pwrdm);
+	struct platform_device *pdev = to_platform_device(dev);
+	struct gpio_bank *bank = &gpio_bank[pdev->id];
 
-		if (per_prev_state == PWRDM_POWER_OFF)
-			omap3_gpio_restore_context();
-	}
+	if (bank->dbck_enable_mask)
+		clk_enable(bank->dbck);
 
-	if (cpu_is_omap34xx())
-		min = 1;
+	if ((!workaround_enabled) || (!(bank->enabled_non_wakeup_gpios)))
+		return 0;
 
-	for (i = min; i < gpio_bank_count; i++) {
-		struct gpio_bank *bank = &gpio_bank[i];
+	if (bank->method == METHOD_GPIO_24XX) {
 		u32 l, gen, gen0, gen1;
 
-		if (bank->dbck_enable_mask)
-			clk_enable(bank->dbck);
-
-		if (!workaround_enabled)
-			continue;
-
-		if (!(bank->enabled_non_wakeup_gpios))
-			continue;
-
-		if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
-			__raw_writel(bank->saved_fallingdetect,
+		__raw_writel(bank->saved_fallingdetect,
 				 bank->base + OMAP24XX_GPIO_FALLINGDETECT);
-			__raw_writel(bank->saved_risingdetect,
+		__raw_writel(bank->saved_risingdetect,
 				 bank->base + OMAP24XX_GPIO_RISINGDETECT);
-			l = __raw_readl(bank->base + OMAP24XX_GPIO_DATAIN);
-		}
-
-		if (cpu_is_omap44xx()) {
-			__raw_writel(bank->saved_fallingdetect,
-				 bank->base + OMAP4_GPIO_FALLINGDETECT);
-			__raw_writel(bank->saved_risingdetect,
-				 bank->base + OMAP4_GPIO_RISINGDETECT);
-			l = __raw_readl(bank->base + OMAP4_GPIO_DATAIN);
-		}
+		l = __raw_readl(bank->base + OMAP24XX_GPIO_DATAIN);
 
 		/* Check if any of the non-wakeup interrupt GPIOs have changed
 		 * state.  If so, generate an IRQ by software.  This is
@@ -2006,51 +1938,79 @@  void omap2_gpio_resume_after_idle(void)
 		if (gen) {
 			u32 old0, old1;
 
-			if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
-				old0 = __raw_readl(bank->base +
+			old0 = __raw_readl(bank->base +
 					OMAP24XX_GPIO_LEVELDETECT0);
-				old1 = __raw_readl(bank->base +
+			old1 = __raw_readl(bank->base +
 					OMAP24XX_GPIO_LEVELDETECT1);
-				__raw_writel(old0 | gen, bank->base +
+			__raw_writel(old0 | gen, bank->base +
 					OMAP24XX_GPIO_LEVELDETECT0);
-				__raw_writel(old1 | gen, bank->base +
+			__raw_writel(old1 | gen, bank->base +
 					OMAP24XX_GPIO_LEVELDETECT1);
-				__raw_writel(old0, bank->base +
+			__raw_writel(old0, bank->base +
 					OMAP24XX_GPIO_LEVELDETECT0);
-				__raw_writel(old1, bank->base +
+			__raw_writel(old1, bank->base +
 					OMAP24XX_GPIO_LEVELDETECT1);
-			}
+		}
+	} else if (bank->method == METHOD_GPIO_44XX) {
+		u32 l, gen, gen0, gen1;
+
+		__raw_writel(bank->saved_fallingdetect,
+				 bank->base + OMAP4_GPIO_FALLINGDETECT);
+		__raw_writel(bank->saved_risingdetect,
+				 bank->base + OMAP4_GPIO_RISINGDETECT);
+		l = __raw_readl(bank->base + OMAP4_GPIO_DATAIN);
+
+		/* Check if any of the non-wakeup interrupt GPIOs have changed
+		 * state.  If so, generate an IRQ by software.  This is
+		 * horribly racy, but it's the best we can do to work around
+		 * this silicon bug. */
+		l ^= bank->saved_datain;
+		l &= bank->enabled_non_wakeup_gpios;
+
+		/*
+		 * No need to generate IRQs for the rising edge for gpio IRQs
+		 * configured with falling edge only; and vice versa.
+		 */
+		gen0 = l & bank->saved_fallingdetect;
+		gen0 &= bank->saved_datain;
+
+		gen1 = l & bank->saved_risingdetect;
+		gen1 &= ~(bank->saved_datain);
 
-			if (cpu_is_omap44xx()) {
-				old0 = __raw_readl(bank->base +
+		/* FIXME: Consider GPIO IRQs with level detections properly! */
+		gen = l & (~(bank->saved_fallingdetect) &
+				~(bank->saved_risingdetect));
+		/* Consider all GPIO IRQs needed to be updated */
+		gen |= gen0 | gen1;
+
+		if (gen) {
+			u32 old0, old1;
+
+			old0 = __raw_readl(bank->base +
 						OMAP4_GPIO_LEVELDETECT0);
-				old1 = __raw_readl(bank->base +
+			old1 = __raw_readl(bank->base +
 						OMAP4_GPIO_LEVELDETECT1);
-				__raw_writel(old0 | l, bank->base +
+			__raw_writel(old0 | l, bank->base +
 						OMAP4_GPIO_LEVELDETECT0);
-				__raw_writel(old1 | l, bank->base +
+			__raw_writel(old1 | l, bank->base +
 						OMAP4_GPIO_LEVELDETECT1);
-				__raw_writel(old0, bank->base +
+			__raw_writel(old0, bank->base +
 						OMAP4_GPIO_LEVELDETECT0);
-				__raw_writel(old1, bank->base +
+			__raw_writel(old1, bank->base +
 						OMAP4_GPIO_LEVELDETECT1);
-			}
 		}
 	}
-}
 
-#endif
+	return 0;
+}
 
-#ifdef CONFIG_ARCH_OMAP3
-/* save the registers of bank 2-6 */
-static void omap3_gpio_save_context(void)
+/* save the registers of bank */
+static void omap_gpio_save_context(struct device *dev)
 {
-	int i;
-
-	/* saving banks from 2-6 only since GPIO1 is in WKUP */
-	for (i = 1; i < gpio_bank_count; i++) {
-		struct gpio_bank *bank = &gpio_bank[i];
+	struct platform_device *pdev = to_platform_device(dev);
+	struct gpio_bank *bank = &gpio_bank[pdev->id];
 
+	if (bank->method == METHOD_GPIO_24XX) {
 		bank->gpio_context.irqenable1 =
 			__raw_readl(bank->base + OMAP24XX_GPIO_IRQENABLE1);
 		bank->gpio_context.irqenable2 =
@@ -2071,17 +2031,37 @@  static void omap3_gpio_save_context(void)
 			__raw_readl(bank->base + OMAP24XX_GPIO_FALLINGDETECT);
 		bank->gpio_context.dataout =
 			__raw_readl(bank->base + OMAP24XX_GPIO_DATAOUT);
+	} else if (bank->method == METHOD_GPIO_44XX) {
+		bank->gpio_context.irqenable1 =
+			__raw_readl(bank->base + OMAP4_GPIO_IRQENABLE1);
+		bank->gpio_context.irqenable2 =
+			__raw_readl(bank->base + OMAP4_GPIO_IRQENABLE2);
+		bank->gpio_context.wake_en =
+			__raw_readl(bank->base + OMAP4_GPIO_WAKE_EN);
+		bank->gpio_context.ctrl =
+			__raw_readl(bank->base + OMAP4_GPIO_CTRL);
+		bank->gpio_context.oe =
+			__raw_readl(bank->base + OMAP4_GPIO_OE);
+		bank->gpio_context.leveldetect0 =
+			__raw_readl(bank->base + OMAP4_GPIO_LEVELDETECT0);
+		bank->gpio_context.leveldetect1 =
+			__raw_readl(bank->base + OMAP4_GPIO_LEVELDETECT1);
+		bank->gpio_context.risingdetect =
+			__raw_readl(bank->base + OMAP4_GPIO_RISINGDETECT);
+		bank->gpio_context.fallingdetect =
+			__raw_readl(bank->base + OMAP4_GPIO_FALLINGDETECT);
+		bank->gpio_context.dataout =
+			__raw_readl(bank->base + OMAP4_GPIO_DATAOUT);
 	}
 }
 
-/* restore the required registers of bank 2-6 */
-static void omap3_gpio_restore_context(void)
+/* restore the required registers of bank */
+static void omap_gpio_restore_context(struct device *dev)
 {
-	int i;
-
-	for (i = 1; i < gpio_bank_count; i++) {
-		struct gpio_bank *bank = &gpio_bank[i];
+	struct platform_device *pdev = to_platform_device(dev);
+	struct gpio_bank *bank = &gpio_bank[pdev->id];
 
+	if (bank->method == METHOD_GPIO_24XX) {
 		__raw_writel(bank->gpio_context.irqenable1,
 				bank->base + OMAP24XX_GPIO_IRQENABLE1);
 		__raw_writel(bank->gpio_context.irqenable2,
@@ -2102,14 +2082,107 @@  static void omap3_gpio_restore_context(void)
 				bank->base + OMAP24XX_GPIO_FALLINGDETECT);
 		__raw_writel(bank->gpio_context.dataout,
 				bank->base + OMAP24XX_GPIO_DATAOUT);
+	} else if (bank->method == METHOD_GPIO_44XX) {
+		__raw_writel(bank->gpio_context.irqenable1,
+				bank->base + OMAP4_GPIO_IRQENABLE1);
+		__raw_writel(bank->gpio_context.irqenable2,
+				bank->base + OMAP4_GPIO_IRQENABLE2);
+		__raw_writel(bank->gpio_context.wake_en,
+				bank->base + OMAP4_GPIO_WAKE_EN);
+		__raw_writel(bank->gpio_context.ctrl,
+				bank->base + OMAP4_GPIO_CTRL);
+		__raw_writel(bank->gpio_context.oe,
+				bank->base + OMAP4_GPIO_OE);
+		__raw_writel(bank->gpio_context.leveldetect0,
+				bank->base + OMAP4_GPIO_LEVELDETECT0);
+		__raw_writel(bank->gpio_context.leveldetect1,
+				bank->base + OMAP4_GPIO_LEVELDETECT1);
+		__raw_writel(bank->gpio_context.risingdetect,
+				bank->base + OMAP4_GPIO_RISINGDETECT);
+		__raw_writel(bank->gpio_context.fallingdetect,
+				bank->base + OMAP4_GPIO_FALLINGDETECT);
+		__raw_writel(bank->gpio_context.dataout,
+				bank->base + OMAP4_GPIO_DATAOUT);
 	}
 }
-#endif
+
+void omap2_gpio_prepare_for_idle(void)
+{
+	int i;
+
+	workaround_enabled = 0;
+
+	for (i = 0; i < gpio_bank_count; i++) {
+		struct gpio_bank *bank = &gpio_bank[i];
+
+		/* If the gpio bank is not used, do nothing */
+		if ((!bank->pwrdm) || !(bank->mod_usage))
+			continue;
+
+		if (strcmp(bank->pwrdm->name, "wkup_pwrdm")) {
+			int pwrdm_next_state;
+
+			pwrdm_next_state = pwrdm_read_next_pwrst(bank->pwrdm);
+			if (pwrdm_next_state >= PWRDM_POWER_INACTIVE)
+				continue;
+
+			if (pwrdm_next_state == PWRDM_POWER_OFF)
+				omap_gpio_save_context(bank->dev);
+
+			pm_runtime_put_sync(bank->dev);
+		}
+	}
+}
+
+void omap2_gpio_resume_after_idle(void)
+{
+	int i;
+
+	for (i = 0; i < gpio_bank_count; i++) {
+		struct gpio_bank *bank = &gpio_bank[i];
+
+		/* If the gpio bank is not used, do nothing */
+		if ((!bank->pwrdm) || !(bank->mod_usage))
+			continue;
+
+		if (strcmp(bank->pwrdm->name, "wkup_pwrdm")) {
+			int pwrdm_next_state;
+
+			pwrdm_next_state = pwrdm_read_next_pwrst(bank->pwrdm);
+			if (pwrdm_next_state >= PWRDM_POWER_INACTIVE)
+				continue;
+
+			pm_runtime_get_sync(bank->dev);
+
+			/*
+			 * Reading the prev-state takes long time (11us@OPP2),
+			 * only do it, if we really tried to put PER in OFF
+			 */
+			if (pwrdm_next_state == PWRDM_POWER_OFF) {
+				int pwrdm_prev_state;
+
+				pwrdm_prev_state =
+					pwrdm_read_prev_pwrst(bank->pwrdm);
+
+				if (pwrdm_prev_state == PWRDM_POWER_OFF)
+					omap_gpio_restore_context(bank->dev);
+			}
+		}
+	}
+}
+
+static const struct dev_pm_ops gpio_pm_ops = {
+	.suspend	 = omap_gpio_suspend,
+	.resume		 = omap_gpio_resume,
+	.runtime_suspend = gpio_bank_runtime_suspend,
+	.runtime_resume	 = gpio_bank_runtime_resume,
+};
 
 static struct platform_driver omap_gpio_driver = {
 	.probe		= omap_gpio_probe,
 	.driver		= {
 		.name	= "omap-gpio",
+		.pm	= &gpio_pm_ops,
 	},
 };
 
@@ -2132,21 +2205,8 @@  int __init omap_gpio_init(void)
 
 static int __init omap_gpio_sysinit(void)
 {
-	int ret = 0;
-
 	mpuio_init();
-
-#if defined(CONFIG_ARCH_OMAP16XX) || defined(CONFIG_ARCH_OMAP2PLUS)
-	if (cpu_is_omap16xx() || cpu_class_is_omap2()) {
-		if (ret == 0) {
-			ret = sysdev_class_register(&omap_gpio_sysclass);
-			if (ret == 0)
-				ret = sysdev_register(&omap_gpio_device);
-		}
-	}
-#endif
-
-	return ret;
+	return 0;
 }
 
 arch_initcall(omap_gpio_sysinit);