[v7,10/11] OMAP: GPIO: Implement GPIO as a platform device
diff mbox

Message ID 1290524213-395-11-git-send-email-charu@ti.com
State Superseded, archived
Delegated to: Tony Lindgren
Headers show

Commit Message

charu@ti.com Nov. 23, 2010, 2:56 p.m. UTC
None

Patch
diff mbox

diff --git a/arch/arm/mach-omap1/Makefile b/arch/arm/mach-omap1/Makefile
index de3cc13..0b1c07f 100644
--- a/arch/arm/mach-omap1/Makefile
+++ b/arch/arm/mach-omap1/Makefile
@@ -49,6 +49,12 @@  ifeq ($(CONFIG_ARCH_OMAP15XX),y)
 obj-$(CONFIG_MACH_OMAP_INNOVATOR)	+= fpga.o
 endif
 
+# GPIO
+obj-$(CONFIG_ARCH_OMAP730)		+= gpio7xx.o
+obj-$(CONFIG_ARCH_OMAP850)		+= gpio7xx.o
+obj-$(CONFIG_ARCH_OMAP15XX)		+= gpio15xx.o
+obj-$(CONFIG_ARCH_OMAP16XX)		+= gpio16xx.o
+
 # LEDs support
 led-$(CONFIG_MACH_OMAP_H2)		+= leds-h2p2-debug.o
 led-$(CONFIG_MACH_OMAP_H3)		+= leds-h2p2-debug.o
diff --git a/arch/arm/mach-omap1/clock_data.c b/arch/arm/mach-omap1/clock_data.c
index af54114..423d21d 100644
--- a/arch/arm/mach-omap1/clock_data.c
+++ b/arch/arm/mach-omap1/clock_data.c
@@ -143,7 +143,7 @@  static struct arm_idlect1_clk armper_ck = {
  * activation.  [ GPIO code for 1510 ]
  */
 static struct clk arm_gpio_ck = {
-	.name		= "arm_gpio_ck",
+	.name		= "ick",
 	.ops		= &clkops_generic,
 	.parent		= &ck_dpll1,
 	.flags		= ENABLE_ON_INIT,
@@ -684,7 +684,7 @@  static struct omap_clk omap_clks[] = {
 	CLK(NULL,	"ck_sossi",	&sossi_ck,	CK_16XX),
 	CLK(NULL,	"arm_ck",	&arm_ck,	CK_16XX | CK_1510 | CK_310),
 	CLK(NULL,	"armper_ck",	&armper_ck.clk,	CK_16XX | CK_1510 | CK_310),
-	CLK(NULL,	"arm_gpio_ck",	&arm_gpio_ck,	CK_1510 | CK_310),
+	CLK("omap_gpio.0", "ick",	&arm_gpio_ck,	CK_1510 | CK_310),
 	CLK(NULL,	"armxor_ck",	&armxor_ck.clk,	CK_16XX | CK_1510 | CK_310 | CK_7XX),
 	CLK(NULL,	"armtim_ck",	&armtim_ck.clk,	CK_16XX | CK_1510 | CK_310),
 	CLK("omap_wdt",	"fck",		&armwdt_ck.clk,	CK_16XX | CK_1510 | CK_310),
diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
index ce7b1f0..fbc8739 100644
--- a/arch/arm/mach-omap2/Makefile
+++ b/arch/arm/mach-omap2/Makefile
@@ -4,7 +4,7 @@ 
 
 # Common support
 obj-y := id.o io.o control.o mux.o devices.o serial.o gpmc.o timer-gp.o pm.o \
-	 common.o
+	 common.o gpio.o
 
 omap-2-3-common				= irq.o sdrc.o prm2xxx_3xxx.o
 hwmod-common				= omap_hwmod.o \
diff --git a/arch/arm/plat-omap/gpio.c b/arch/arm/plat-omap/gpio.c
index 610787c..d04ded2 100644
--- a/arch/arm/plat-omap/gpio.c
+++ b/arch/arm/plat-omap/gpio.c
@@ -21,6 +21,8 @@ 
 #include <linux/err.h>
 #include <linux/clk.h>
 #include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/pm_runtime.h>
 
 #include <mach/hardware.h>
 #include <asm/irq.h>
@@ -32,7 +34,6 @@ 
 /*
  * OMAP1510 GPIO registers
  */
-#define OMAP1510_GPIO_BASE		0xfffce000
 #define OMAP1510_GPIO_DATA_INPUT	0x00
 #define OMAP1510_GPIO_DATA_OUTPUT	0x04
 #define OMAP1510_GPIO_DIR_CONTROL	0x08
@@ -46,10 +47,6 @@ 
 /*
  * OMAP1610 specific GPIO registers
  */
-#define OMAP1610_GPIO1_BASE		0xfffbe400
-#define OMAP1610_GPIO2_BASE		0xfffbec00
-#define OMAP1610_GPIO3_BASE		0xfffbb400
-#define OMAP1610_GPIO4_BASE		0xfffbbc00
 #define OMAP1610_GPIO_REVISION		0x0000
 #define OMAP1610_GPIO_SYSCONFIG		0x0010
 #define OMAP1610_GPIO_SYSSTATUS		0x0014
@@ -71,12 +68,6 @@ 
 /*
  * OMAP7XX specific GPIO registers
  */
-#define OMAP7XX_GPIO1_BASE		0xfffbc000
-#define OMAP7XX_GPIO2_BASE		0xfffbc800
-#define OMAP7XX_GPIO3_BASE		0xfffbd000
-#define OMAP7XX_GPIO4_BASE		0xfffbd800
-#define OMAP7XX_GPIO5_BASE		0xfffbe000
-#define OMAP7XX_GPIO6_BASE		0xfffbe800
 #define OMAP7XX_GPIO_DATA_INPUT		0x00
 #define OMAP7XX_GPIO_DATA_OUTPUT	0x04
 #define OMAP7XX_GPIO_DIR_CONTROL	0x08
@@ -84,25 +75,10 @@ 
 #define OMAP7XX_GPIO_INT_MASK		0x10
 #define OMAP7XX_GPIO_INT_STATUS		0x14
 
-#define OMAP1_MPUIO_VBASE		OMAP1_MPUIO_BASE
-
 /*
- * omap24xx specific GPIO registers
+ * omap2+ specific GPIO registers
  */
-#define OMAP242X_GPIO1_BASE		0x48018000
-#define OMAP242X_GPIO2_BASE		0x4801a000
-#define OMAP242X_GPIO3_BASE		0x4801c000
-#define OMAP242X_GPIO4_BASE		0x4801e000
-
-#define OMAP243X_GPIO1_BASE		0x4900C000
-#define OMAP243X_GPIO2_BASE		0x4900E000
-#define OMAP243X_GPIO3_BASE		0x49010000
-#define OMAP243X_GPIO4_BASE		0x49012000
-#define OMAP243X_GPIO5_BASE		0x480B6000
-
 #define OMAP24XX_GPIO_REVISION		0x0000
-#define OMAP24XX_GPIO_SYSCONFIG		0x0010
-#define OMAP24XX_GPIO_SYSSTATUS		0x0014
 #define OMAP24XX_GPIO_IRQSTATUS1	0x0018
 #define OMAP24XX_GPIO_IRQSTATUS2	0x0028
 #define OMAP24XX_GPIO_IRQENABLE2	0x002c
@@ -126,7 +102,6 @@ 
 #define OMAP24XX_GPIO_SETDATAOUT	0x0094
 
 #define OMAP4_GPIO_REVISION		0x0000
-#define OMAP4_GPIO_SYSCONFIG		0x0010
 #define OMAP4_GPIO_EOI			0x0020
 #define OMAP4_GPIO_IRQSTATUSRAW0	0x0024
 #define OMAP4_GPIO_IRQSTATUSRAW1	0x0028
@@ -138,7 +113,6 @@ 
 #define OMAP4_GPIO_IRQSTATUSCLR1	0x0040
 #define OMAP4_GPIO_IRQWAKEN0		0x0044
 #define OMAP4_GPIO_IRQWAKEN1		0x0048
-#define OMAP4_GPIO_SYSSTATUS		0x0114
 #define OMAP4_GPIO_IRQENABLE1		0x011c
 #define OMAP4_GPIO_WAKE_EN		0x0120
 #define OMAP4_GPIO_IRQSTATUS2		0x0128
@@ -159,26 +133,6 @@ 
 #define OMAP4_GPIO_SETWKUENA		0x0184
 #define OMAP4_GPIO_CLEARDATAOUT		0x0190
 #define OMAP4_GPIO_SETDATAOUT		0x0194
-/*
- * omap34xx specific GPIO registers
- */
-
-#define OMAP34XX_GPIO1_BASE		0x48310000
-#define OMAP34XX_GPIO2_BASE		0x49050000
-#define OMAP34XX_GPIO3_BASE		0x49052000
-#define OMAP34XX_GPIO4_BASE		0x49054000
-#define OMAP34XX_GPIO5_BASE		0x49056000
-#define OMAP34XX_GPIO6_BASE		0x49058000
-
-/*
- * OMAP44XX  specific GPIO registers
- */
-#define OMAP44XX_GPIO1_BASE             0x4a310000
-#define OMAP44XX_GPIO2_BASE             0x48055000
-#define OMAP44XX_GPIO3_BASE             0x48057000
-#define OMAP44XX_GPIO4_BASE             0x48059000
-#define OMAP44XX_GPIO5_BASE             0x4805B000
-#define OMAP44XX_GPIO6_BASE             0x4805D000
 
 struct gpio_bank {
 	unsigned long pbase;
@@ -203,97 +157,12 @@  struct gpio_bank {
 	struct clk *dbck;
 	u32 mod_usage;
 	u32 dbck_enable_mask;
+	struct device *dev;
+	bool dbck_flag;
 };
 
-#ifdef CONFIG_ARCH_OMAP16XX
-static struct gpio_bank gpio_bank_1610[5] = {
-	{ OMAP1_MPUIO_VBASE, NULL, INT_MPUIO, IH_MPUIO_BASE,
-		METHOD_MPUIO },
-	{ OMAP1610_GPIO1_BASE, NULL, INT_GPIO_BANK1, IH_GPIO_BASE,
-		METHOD_GPIO_1610 },
-	{ OMAP1610_GPIO2_BASE, NULL, INT_1610_GPIO_BANK2, IH_GPIO_BASE + 16,
-		METHOD_GPIO_1610 },
-	{ OMAP1610_GPIO3_BASE, NULL, INT_1610_GPIO_BANK3, IH_GPIO_BASE + 32,
-		METHOD_GPIO_1610 },
-	{ OMAP1610_GPIO4_BASE, NULL, INT_1610_GPIO_BANK4, IH_GPIO_BASE + 48,
-		METHOD_GPIO_1610 },
-};
-#endif
-
-#ifdef CONFIG_ARCH_OMAP15XX
-static struct gpio_bank gpio_bank_1510[2] = {
-	{ OMAP1_MPUIO_VBASE, NULL, INT_MPUIO, IH_MPUIO_BASE,
-		METHOD_MPUIO },
-	{ OMAP1510_GPIO_BASE, NULL, INT_GPIO_BANK1, IH_GPIO_BASE,
-		METHOD_GPIO_1510 }
-};
-#endif
-
-#if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850)
-static struct gpio_bank gpio_bank_7xx[7] = {
-	{ OMAP1_MPUIO_VBASE, NULL, INT_7XX_MPUIO, IH_MPUIO_BASE,
-		METHOD_MPUIO },
-	{ OMAP7XX_GPIO1_BASE, NULL, INT_7XX_GPIO_BANK1, IH_GPIO_BASE,
-		METHOD_GPIO_7XX },
-	{ OMAP7XX_GPIO2_BASE, NULL, INT_7XX_GPIO_BANK2, IH_GPIO_BASE + 32,
-		METHOD_GPIO_7XX },
-	{ OMAP7XX_GPIO3_BASE, NULL, INT_7XX_GPIO_BANK3, IH_GPIO_BASE + 64,
-		METHOD_GPIO_7XX },
-	{ OMAP7XX_GPIO4_BASE, NULL, INT_7XX_GPIO_BANK4,  IH_GPIO_BASE + 96,
-		METHOD_GPIO_7XX },
-	{ OMAP7XX_GPIO5_BASE, NULL, INT_7XX_GPIO_BANK5,  IH_GPIO_BASE + 128,
-		METHOD_GPIO_7XX },
-	{ OMAP7XX_GPIO6_BASE, NULL, INT_7XX_GPIO_BANK6,  IH_GPIO_BASE + 160,
-		METHOD_GPIO_7XX },
-};
-#endif
-
-#ifdef CONFIG_ARCH_OMAP2
-
-static struct gpio_bank gpio_bank_242x[4] = {
-	{ OMAP242X_GPIO1_BASE, NULL, INT_24XX_GPIO_BANK1, IH_GPIO_BASE,
-		METHOD_GPIO_24XX },
-	{ OMAP242X_GPIO2_BASE, NULL, INT_24XX_GPIO_BANK2, IH_GPIO_BASE + 32,
-		METHOD_GPIO_24XX },
-	{ OMAP242X_GPIO3_BASE, NULL, INT_24XX_GPIO_BANK3, IH_GPIO_BASE + 64,
-		METHOD_GPIO_24XX },
-	{ OMAP242X_GPIO4_BASE, NULL, INT_24XX_GPIO_BANK4, IH_GPIO_BASE + 96,
-		METHOD_GPIO_24XX },
-};
-
-static struct gpio_bank gpio_bank_243x[5] = {
-	{ OMAP243X_GPIO1_BASE, NULL, INT_24XX_GPIO_BANK1, IH_GPIO_BASE,
-		METHOD_GPIO_24XX },
-	{ OMAP243X_GPIO2_BASE, NULL, INT_24XX_GPIO_BANK2, IH_GPIO_BASE + 32,
-		METHOD_GPIO_24XX },
-	{ OMAP243X_GPIO3_BASE, NULL, INT_24XX_GPIO_BANK3, IH_GPIO_BASE + 64,
-		METHOD_GPIO_24XX },
-	{ OMAP243X_GPIO4_BASE, NULL, INT_24XX_GPIO_BANK4, IH_GPIO_BASE + 96,
-		METHOD_GPIO_24XX },
-	{ OMAP243X_GPIO5_BASE, NULL, INT_24XX_GPIO_BANK5, IH_GPIO_BASE + 128,
-		METHOD_GPIO_24XX },
-};
-
-#endif
-
 #ifdef CONFIG_ARCH_OMAP3
-static struct gpio_bank gpio_bank_34xx[6] = {
-	{ OMAP34XX_GPIO1_BASE, NULL, INT_34XX_GPIO_BANK1, IH_GPIO_BASE,
-		METHOD_GPIO_24XX },
-	{ OMAP34XX_GPIO2_BASE, NULL, INT_34XX_GPIO_BANK2, IH_GPIO_BASE + 32,
-		METHOD_GPIO_24XX },
-	{ OMAP34XX_GPIO3_BASE, NULL, INT_34XX_GPIO_BANK3, IH_GPIO_BASE + 64,
-		METHOD_GPIO_24XX },
-	{ OMAP34XX_GPIO4_BASE, NULL, INT_34XX_GPIO_BANK4, IH_GPIO_BASE + 96,
-		METHOD_GPIO_24XX },
-	{ OMAP34XX_GPIO5_BASE, NULL, INT_34XX_GPIO_BANK5, IH_GPIO_BASE + 128,
-		METHOD_GPIO_24XX },
-	{ OMAP34XX_GPIO6_BASE, NULL, INT_34XX_GPIO_BANK6, IH_GPIO_BASE + 160,
-		METHOD_GPIO_24XX },
-};
-
 struct omap3_gpio_regs {
-	u32 sysconfig;
 	u32 irqenable1;
 	u32 irqenable2;
 	u32 wake_en;
@@ -309,25 +178,14 @@  struct omap3_gpio_regs {
 static struct omap3_gpio_regs gpio_context[OMAP34XX_NR_GPIOS];
 #endif
 
-#ifdef CONFIG_ARCH_OMAP4
-static struct gpio_bank gpio_bank_44xx[6] = {
-	{ OMAP44XX_GPIO1_BASE, NULL, OMAP44XX_IRQ_GPIO1, IH_GPIO_BASE,
-		METHOD_GPIO_44XX },
-	{ OMAP44XX_GPIO2_BASE, NULL, OMAP44XX_IRQ_GPIO2, IH_GPIO_BASE + 32,
-		METHOD_GPIO_44XX },
-	{ OMAP44XX_GPIO3_BASE, NULL, OMAP44XX_IRQ_GPIO3, IH_GPIO_BASE + 64,
-		METHOD_GPIO_44XX },
-	{ OMAP44XX_GPIO4_BASE, NULL, OMAP44XX_IRQ_GPIO4, IH_GPIO_BASE + 96,
-		METHOD_GPIO_44XX },
-	{ OMAP44XX_GPIO5_BASE, NULL, OMAP44XX_IRQ_GPIO5, IH_GPIO_BASE + 128,
-		METHOD_GPIO_44XX },
-	{ OMAP44XX_GPIO6_BASE, NULL, OMAP44XX_IRQ_GPIO6, IH_GPIO_BASE + 160,
-		METHOD_GPIO_44XX },
-};
+/*
+ * TODO: Cleanup gpio_bank usage as it is having information
+ * related to all instances of the device
+ */
+static struct gpio_bank *gpio_bank;
 
-#endif
+static int bank_width;
 
-static struct gpio_bank *gpio_bank;
 /* TODO: Analyze removing gpio_bank_count usage from driver code */
 int gpio_bank_count;
 
@@ -634,6 +492,9 @@  static void _set_gpio_debounce(struct gpio_bank *bank, unsigned gpio,
 	u32			val;
 	u32			l;
 
+	if (!bank->dbck_flag)
+		return;
+
 	if (debounce < 32)
 		debounce = 0x01;
 	else if (debounce > 7936)
@@ -643,7 +504,7 @@  static void _set_gpio_debounce(struct gpio_bank *bank, unsigned gpio,
 
 	l = 1 << get_gpio_index(gpio);
 
-	if (cpu_is_omap44xx())
+	if (bank->method == METHOD_GPIO_44XX)
 		reg += OMAP4_GPIO_DEBOUNCINGTIME;
 	else
 		reg += OMAP24XX_GPIO_DEBOUNCE_VAL;
@@ -651,7 +512,7 @@  static void _set_gpio_debounce(struct gpio_bank *bank, unsigned gpio,
 	__raw_writel(debounce, reg);
 
 	reg = bank->base;
-	if (cpu_is_omap44xx())
+	if (bank->method == METHOD_GPIO_44XX)
 		reg += OMAP4_GPIO_DEBOUNCENABLE;
 	else
 		reg += OMAP24XX_GPIO_DEBOUNCE_EN;
@@ -660,12 +521,10 @@  static void _set_gpio_debounce(struct gpio_bank *bank, unsigned gpio,
 
 	if (debounce) {
 		val |= l;
-		if (cpu_is_omap34xx() || cpu_is_omap44xx())
-			clk_enable(bank->dbck);
+		clk_enable(bank->dbck);
 	} else {
 		val &= ~l;
-		if (cpu_is_omap34xx() || cpu_is_omap44xx())
-			clk_disable(bank->dbck);
+		clk_disable(bank->dbck);
 	}
 	bank->dbck_enable_mask = val;
 
@@ -1537,7 +1396,8 @@  static struct platform_device omap_mpuio_device = {
 
 static inline void mpuio_init(void)
 {
-	platform_set_drvdata(&omap_mpuio_device, &gpio_bank_1610[0]);
+	struct gpio_bank *bank = get_gpio_bank(OMAP_MPUIO(0));
+	platform_set_drvdata(&omap_mpuio_device, bank);
 
 	if (platform_driver_register(&omap_mpuio_driver) == 0)
 		(void) platform_device_register(&omap_mpuio_device);
@@ -1642,6 +1502,13 @@  static int gpio_debounce(struct gpio_chip *chip, unsigned offset,
 	unsigned long flags;
 
 	bank = container_of(chip, struct gpio_bank, chip);
+
+	if (!bank->dbck) {
+		bank->dbck = clk_get(bank->dev, "dbclk");
+		if (IS_ERR(bank->dbck))
+			dev_err(bank->dev, "Could not get gpio dbck\n");
+	}
+
 	spin_lock_irqsave(&bank->lock, flags);
 	_set_gpio_debounce(bank, offset, debounce);
 	spin_unlock_irqrestore(&bank->lock, flags);
@@ -1670,24 +1537,6 @@  static int gpio_2irq(struct gpio_chip *chip, unsigned offset)
 
 /*---------------------------------------------------------------------*/
 
-static int initialized;
-#if defined(CONFIG_ARCH_OMAP1) || defined(CONFIG_ARCH_OMAP2)
-static struct clk * gpio_ick;
-#endif
-
-#if defined(CONFIG_ARCH_OMAP2)
-static struct clk * gpio_fck;
-#endif
-
-#if defined(CONFIG_ARCH_OMAP2430)
-static struct clk * gpio5_ick;
-static struct clk * gpio5_fck;
-#endif
-
-#if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_ARCH_OMAP4)
-static struct clk *gpio_iclks[OMAP34XX_NR_GPIOS];
-#endif
-
 static void __init omap_gpio_show_rev(void)
 {
 	u32 rev;
@@ -1710,6 +1559,19 @@  static void __init omap_gpio_show_rev(void)
  */
 static struct lock_class_key gpio_lock_class;
 
+static inline int init_gpio_info(struct platform_device *pdev)
+{
+	/* TODO: Analyze removing gpio_bank_count usage from driver code */
+	gpio_bank = kzalloc(gpio_bank_count * sizeof(struct gpio_bank),
+				GFP_KERNEL);
+	if (!gpio_bank) {
+		dev_err(&pdev->dev, "Memory alloc failed for gpio_bank\n");
+		return -ENOMEM;
+	}
+	return 0;
+}
+
+/* TODO: Cleanup cpu_is_* checks */
 static void omap_gpio_mod_init(struct gpio_bank *bank, int id)
 {
 	if (cpu_class_is_omap2()) {
@@ -1773,16 +1635,9 @@  static void omap_gpio_mod_init(struct gpio_bank *bank, int id)
 
 static void __init omap_gpio_chip_init(struct gpio_bank *bank)
 {
-	int j, bank_width = 16;
+	int j;
 	static int gpio;
 
-	if (cpu_is_omap7xx() && bank->method == METHOD_GPIO_7XX)
-		bank_width = 32; /* 7xx has 32-bit GPIOs */
-
-	if ((bank->method == METHOD_GPIO_24XX) ||
-			(bank->method == METHOD_GPIO_44XX))
-		bank_width = 32;
-
 	bank->mod_usage = 0;
 	/*
 	 * REVISIT eventually switch from OMAP-specific gpio structs
@@ -1826,138 +1681,68 @@  static void __init omap_gpio_chip_init(struct gpio_bank *bank)
 	set_irq_data(bank->irq, bank);
 }
 
-static int __init _omap_gpio_init(void)
+static int __devinit omap_gpio_probe(struct platform_device *pdev)
 {
-	int i;
+	static int gpio_init_done;
+	struct omap_gpio_platform_data *pdata;
+	struct resource *res;
+	int id;
 	struct gpio_bank *bank;
-	int bank_size = SZ_8K;	/* Module 4KB + L4 4KB except on omap1 */
-	char clk_name[11];
 
-	initialized = 1;
+	if (!pdev->dev.platform_data)
+		return -EINVAL;
 
-#if defined(CONFIG_ARCH_OMAP1)
-	if (cpu_is_omap15xx()) {
-		gpio_ick = clk_get(NULL, "arm_gpio_ck");
-		if (IS_ERR(gpio_ick))
-			printk("Could not get arm_gpio_ck\n");
-		else
-			clk_enable(gpio_ick);
-	}
-#endif
-#if defined(CONFIG_ARCH_OMAP2)
-	if (cpu_class_is_omap2()) {
-		gpio_ick = clk_get(NULL, "gpios_ick");
-		if (IS_ERR(gpio_ick))
-			printk("Could not get gpios_ick\n");
-		else
-			clk_enable(gpio_ick);
-		gpio_fck = clk_get(NULL, "gpios_fck");
-		if (IS_ERR(gpio_fck))
-			printk("Could not get gpios_fck\n");
-		else
-			clk_enable(gpio_fck);
+	pdata = pdev->dev.platform_data;
 
-		/*
-		 * On 2430 & 3430 GPIO 5 uses CORE L4 ICLK
-		 */
-#if defined(CONFIG_ARCH_OMAP2430)
-		if (cpu_is_omap2430()) {
-			gpio5_ick = clk_get(NULL, "gpio5_ick");
-			if (IS_ERR(gpio5_ick))
-				printk("Could not get gpio5_ick\n");
-			else
-				clk_enable(gpio5_ick);
-			gpio5_fck = clk_get(NULL, "gpio5_fck");
-			if (IS_ERR(gpio5_fck))
-				printk("Could not get gpio5_fck\n");
-			else
-				clk_enable(gpio5_fck);
-		}
-#endif
-	}
-#endif
+	if (!gpio_init_done) {
+		int ret;
 
-#if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_ARCH_OMAP4)
-	if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
-		for (i = 0; i < OMAP34XX_NR_GPIOS; i++) {
-			sprintf(clk_name, "gpio%d_ick", i + 1);
-			gpio_iclks[i] = clk_get(NULL, clk_name);
-			if (IS_ERR(gpio_iclks[i]))
-				printk(KERN_ERR "Could not get %s\n", clk_name);
-			else
-				clk_enable(gpio_iclks[i]);
-		}
+		ret = init_gpio_info(pdev);
+		if (ret)
+			return ret;
 	}
-#endif
 
+	id = pdev->id;
+	bank = &gpio_bank[id];
 
-#ifdef CONFIG_ARCH_OMAP15XX
-	if (cpu_is_omap15xx()) {
-		gpio_bank_count = 2;
-		gpio_bank = gpio_bank_1510;
-		bank_size = SZ_2K;
-	}
-#endif
-#if defined(CONFIG_ARCH_OMAP16XX)
-	if (cpu_is_omap16xx()) {
-		gpio_bank_count = 5;
-		gpio_bank = gpio_bank_1610;
-		bank_size = SZ_2K;
-	}
-#endif
-#if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850)
-	if (cpu_is_omap7xx()) {
-		gpio_bank_count = 7;
-		gpio_bank = gpio_bank_7xx;
-		bank_size = SZ_2K;
-	}
-#endif
-#ifdef CONFIG_ARCH_OMAP2
-	if (cpu_is_omap242x()) {
-		gpio_bank_count = 4;
-		gpio_bank = gpio_bank_242x;
-	}
-	if (cpu_is_omap243x()) {
-		gpio_bank_count = 5;
-		gpio_bank = gpio_bank_243x;
-	}
-#endif
-#ifdef CONFIG_ARCH_OMAP3
-	if (cpu_is_omap34xx()) {
-		gpio_bank_count = OMAP34XX_NR_GPIOS;
-		gpio_bank = gpio_bank_34xx;
-	}
-#endif
-#ifdef CONFIG_ARCH_OMAP4
-	if (cpu_is_omap44xx()) {
-		gpio_bank_count = OMAP34XX_NR_GPIOS;
-		gpio_bank = gpio_bank_44xx;
+	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	if (unlikely(!res)) {
+		dev_err(&pdev->dev, "GPIO Bank %i Invalid IRQ resource\n", id);
+		return -ENODEV;
 	}
-#endif
-	for (i = 0; i < gpio_bank_count; i++) {
 
-		bank = &gpio_bank[i];
-		spin_lock_init(&bank->lock);
+	bank->irq = res->start;
+	bank->virtual_irq_start = pdata->virtual_irq_start;
+	bank->method = pdata->bank_type;
+	bank->dev = &pdev->dev;
+	bank->dbck_flag = pdata->dbck_flag;
+	bank_width = pdata->bank_width;
 
-		/* Static mapping, never released */
-		bank->base = ioremap(bank->pbase, bank_size);
-		if (!bank->base) {
-			printk(KERN_ERR "Could not ioremap gpio bank%i\n", i);
-			continue;
-		}
+	spin_lock_init(&bank->lock);
 
-		omap_gpio_mod_init(bank, i);
-		omap_gpio_chip_init(bank);
+	/* Static mapping, never released */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (unlikely(!res)) {
+		dev_err(&pdev->dev, "GPIO Bank %i Invalid mem resource\n", id);
+		return -ENODEV;
+	}
 
-		if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
-			sprintf(clk_name, "gpio%d_dbck", i + 1);
-			bank->dbck = clk_get(NULL, clk_name);
-			if (IS_ERR(bank->dbck))
-				printk(KERN_ERR "Could not get %s\n", clk_name);
-		}
+	bank->base = ioremap(res->start, resource_size(res));
+	if (!bank->base) {
+		dev_err(&pdev->dev, "Could not ioremap gpio bank%i\n", id);
+		return -ENOMEM;
 	}
 
-	omap_gpio_show_rev();
+	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) {
+		omap_gpio_show_rev();
+		gpio_init_done = 1;
+	}
 
 	return 0;
 }
@@ -2252,8 +2037,6 @@  void omap_gpio_save_context(void)
 	/* 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];
-		gpio_context[i].sysconfig =
-			__raw_readl(bank->base + OMAP24XX_GPIO_SYSCONFIG);
 		gpio_context[i].irqenable1 =
 			__raw_readl(bank->base + OMAP24XX_GPIO_IRQENABLE1);
 		gpio_context[i].irqenable2 =
@@ -2284,8 +2067,6 @@  void omap_gpio_restore_context(void)
 
 	for (i = 1; i < gpio_bank_count; i++) {
 		struct gpio_bank *bank = &gpio_bank[i];
-		__raw_writel(gpio_context[i].sysconfig,
-				bank->base + OMAP24XX_GPIO_SYSCONFIG);
 		__raw_writel(gpio_context[i].irqenable1,
 				bank->base + OMAP24XX_GPIO_IRQENABLE1);
 		__raw_writel(gpio_context[i].irqenable2,
@@ -2310,25 +2091,34 @@  void omap_gpio_restore_context(void)
 }
 #endif
 
+static struct platform_driver omap_gpio_driver = {
+	.probe		= omap_gpio_probe,
+	.driver		= {
+		.name	= "omap_gpio",
+	},
+};
+
 /*
- * This may get called early from board specific init
- * for boards that have interrupts routed via FPGA.
+ * gpio driver register needs to be done before
+ * machine_init functions access gpio APIs.
+ * Hence omap_gpio_drv_reg() is a postcore_initcall.
  */
+static int __init omap_gpio_drv_reg(void)
+{
+	return platform_driver_register(&omap_gpio_driver);
+}
+postcore_initcall(omap_gpio_drv_reg);
+
+/* TODO: Remove omap_gpio_init() and its usage from board files */
 int __init omap_gpio_init(void)
 {
-	if (!initialized)
-		return _omap_gpio_init();
-	else
-		return 0;
+	return 0;
 }
 
 static int __init omap_gpio_sysinit(void)
 {
 	int ret = 0;
 
-	if (!initialized)
-		ret = _omap_gpio_init();
-
 	mpuio_init();
 
 #if defined(CONFIG_ARCH_OMAP16XX) || defined(CONFIG_ARCH_OMAP2PLUS)