OMAP: GPIO: prepare for platform driver

Prepare for implementing GPIO as a platform driver.

Modifies omap_gpio_init() to make use of omap_gpio_chip_init()
and omap_gpio_mod_init(). omap_gpio_mod_init() does the module init
by clearing the status register and initializing the GPIO control register.
omap_gpio_chip_init() initializes the chip request, free, get, set and
other function pointers and sets the gpio irq handler.

This is only to reorganize the code so that the "omap gpio platform driver
implementation patch" looks cleaner and better to review.

Signed-off-by: Charulatha V <charu@ti.com>
Acked-by: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/plat-omap/gpio.c

@@ -190,14 +190,12 @@ struct gpio_bank {
 	u32 suspend_wakeup;
 	u32 saved_wakeup;
 #endif
-#ifdef CONFIG_ARCH_OMAP2PLUS
 	u32 non_wakeup_gpios;
 	u32 enabled_non_wakeup_gpios;
 
 	u32 saved_datain;
 	u32 saved_fallingdetect;
 	u32 saved_risingdetect;
-#endif
 	u32 level_mask;
 	u32 toggle_mask;
 	spinlock_t lock;
@@ -1718,10 +1716,125 @@ static void __init omap_gpio_show_rev(void)
  */
 static struct lock_class_key gpio_lock_class;
 
+static void omap_gpio_mod_init(struct gpio_bank *bank, int id)
+{
+	if (cpu_class_is_omap2()) {
+		if (cpu_is_omap44xx()) {
+			__raw_writel(0xffffffff, bank->base +
+					OMAP4_GPIO_IRQSTATUSCLR0);
+			__raw_writel(0x00000000, bank->base +
+					 OMAP4_GPIO_DEBOUNCENABLE);
+			/* Initialize interface clk ungated, module enabled */
+			__raw_writel(0, bank->base + OMAP4_GPIO_CTRL);
+		} else if (cpu_is_omap34xx()) {
+			__raw_writel(0x00000000, bank->base +
+					OMAP24XX_GPIO_IRQENABLE1);
+			__raw_writel(0xffffffff, bank->base +
+					OMAP24XX_GPIO_IRQSTATUS1);
+			__raw_writel(0x00000000, bank->base +
+					OMAP24XX_GPIO_DEBOUNCE_EN);
+
+			/* Initialize interface clk ungated, module enabled */
+			__raw_writel(0, bank->base + OMAP24XX_GPIO_CTRL);
+		} else if (cpu_is_omap24xx()) {
+			static const u32 non_wakeup_gpios[] = {
+				0xe203ffc0, 0x08700040
+			};
+			if (id < ARRAY_SIZE(non_wakeup_gpios))
+				bank->non_wakeup_gpios = non_wakeup_gpios[id];
+		}
+	} else if (cpu_class_is_omap1()) {
+		if (bank_is_mpuio(bank))
+			__raw_writew(0xffff, bank->base
+						+ OMAP_MPUIO_GPIO_MASKIT);
+		if (cpu_is_omap15xx() && bank->method == METHOD_GPIO_1510) {
+			__raw_writew(0xffff, bank->base
+						+ OMAP1510_GPIO_INT_MASK);
+			__raw_writew(0x0000, bank->base
+						+ OMAP1510_GPIO_INT_STATUS);
+		}
+		if (cpu_is_omap16xx() && bank->method == METHOD_GPIO_1610) {
+			__raw_writew(0x0000, bank->base
+						+ OMAP1610_GPIO_IRQENABLE1);
+			__raw_writew(0xffff, bank->base
+						+ OMAP1610_GPIO_IRQSTATUS1);
+			__raw_writew(0x0014, bank->base
+						+ OMAP1610_GPIO_SYSCONFIG);
+
+			/*
+			 * Enable system clock for GPIO module.
+			 * The CAM_CLK_CTRL *is* really the right place.
+			 */
+			omap_writel(omap_readl(ULPD_CAM_CLK_CTRL) | 0x04,
+						ULPD_CAM_CLK_CTRL);
+		}
+		if (cpu_is_omap7xx() && bank->method == METHOD_GPIO_7XX) {
+			__raw_writel(0xffffffff, bank->base
+						+ OMAP7XX_GPIO_INT_MASK);
+			__raw_writel(0x00000000, bank->base
+						+ OMAP7XX_GPIO_INT_STATUS);
+		}
+	}
+}
+
+static void __init omap_gpio_chip_init(struct gpio_bank *bank)
+{
+	int j, bank_width = 16;
+	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
+	 * over to the generic ones
+	 */
+	bank->chip.request = omap_gpio_request;
+	bank->chip.free = omap_gpio_free;
+	bank->chip.direction_input = gpio_input;
+	bank->chip.get = gpio_get;
+	bank->chip.direction_output = gpio_output;
+	bank->chip.set_debounce = gpio_debounce;
+	bank->chip.set = gpio_set;
+	bank->chip.to_irq = gpio_2irq;
+	if (bank_is_mpuio(bank)) {
+		bank->chip.label = "mpuio";
+#ifdef CONFIG_ARCH_OMAP16XX
+		bank->chip.dev = &omap_mpuio_device.dev;
+#endif
+		bank->chip.base = OMAP_MPUIO(0);
+	} else {
+		bank->chip.label = "gpio";
+		bank->chip.base = gpio;
+		gpio += bank_width;
+	}
+	bank->chip.ngpio = bank_width;
+
+	gpiochip_add(&bank->chip);
+
+	for (j = bank->virtual_irq_start;
+		     j < bank->virtual_irq_start + bank_width; j++) {
+		lockdep_set_class(&irq_desc[j].lock, &gpio_lock_class);
+		set_irq_chip_data(j, bank);
+		if (bank_is_mpuio(bank))
+			set_irq_chip(j, &mpuio_irq_chip);
+		else
+			set_irq_chip(j, &gpio_irq_chip);
+		set_irq_handler(j, handle_simple_irq);
+		set_irq_flags(j, IRQF_VALID);
+	}
+	set_irq_chained_handler(bank->irq, gpio_irq_handler);
+	set_irq_data(bank->irq, bank);
+}
+
 static int __init _omap_gpio_init(void)
 {
 	int i;
-	int gpio = 0;
 	struct gpio_bank *bank;
 	int bank_size = SZ_8K;	/* Module 4KB + L4 4KB except on omap1 */
 	char clk_name[11];
@@ -1828,7 +1941,6 @@ static int __init _omap_gpio_init(void)
 	}
 #endif
 	for (i = 0; i < gpio_bank_count; i++) {
-		int j, gpio_count = 16;
 
 		bank = &gpio_bank[i];
 		spin_lock_init(&bank->lock);
@@ -1840,107 +1952,8 @@ static int __init _omap_gpio_init(void)
 			continue;
 		}
 
-		if (bank_is_mpuio(bank))
-			__raw_writew(0xffff, bank->base + OMAP_MPUIO_GPIO_MASKIT);
-		if (cpu_is_omap15xx() && bank->method == METHOD_GPIO_1510) {
-			__raw_writew(0xffff, bank->base + OMAP1510_GPIO_INT_MASK);
-			__raw_writew(0x0000, bank->base + OMAP1510_GPIO_INT_STATUS);
-		}
-		if (cpu_is_omap16xx() && bank->method == METHOD_GPIO_1610) {
-			__raw_writew(0x0000, bank->base + OMAP1610_GPIO_IRQENABLE1);
-			__raw_writew(0xffff, bank->base + OMAP1610_GPIO_IRQSTATUS1);
-			__raw_writew(0x0014, bank->base + OMAP1610_GPIO_SYSCONFIG);
-		}
-		if (cpu_is_omap7xx() && bank->method == METHOD_GPIO_7XX) {
-			__raw_writel(0xffffffff, bank->base + OMAP7XX_GPIO_INT_MASK);
-			__raw_writel(0x00000000, bank->base + OMAP7XX_GPIO_INT_STATUS);
-
-			gpio_count = 32; /* 7xx has 32-bit GPIOs */
-		}
-
-#ifdef CONFIG_ARCH_OMAP2PLUS
-		if ((bank->method == METHOD_GPIO_24XX) ||
-				(bank->method == METHOD_GPIO_44XX)) {
-			static const u32 non_wakeup_gpios[] = {
-				0xe203ffc0, 0x08700040
-			};
-
-			if (cpu_is_omap44xx()) {
-				__raw_writel(0xffffffff, bank->base +
-						OMAP4_GPIO_IRQSTATUSCLR0);
-				__raw_writew(0x0015, bank->base +
-						OMAP4_GPIO_SYSCONFIG);
-				__raw_writel(0x00000000, bank->base +
-						 OMAP4_GPIO_DEBOUNCENABLE);
-				/*
-				 * Initialize interface clock ungated,
-				 * module enabled
-				 */
-				__raw_writel(0, bank->base + OMAP4_GPIO_CTRL);
-			} else {
-				__raw_writel(0x00000000, bank->base +
-						OMAP24XX_GPIO_IRQENABLE1);
-				__raw_writel(0xffffffff, bank->base +
-						OMAP24XX_GPIO_IRQSTATUS1);
-				__raw_writew(0x0015, bank->base +
-						OMAP24XX_GPIO_SYSCONFIG);
-				__raw_writel(0x00000000, bank->base +
-						OMAP24XX_GPIO_DEBOUNCE_EN);
-
-				/*
-				 * Initialize interface clock ungated,
-				 * module enabled
-				 */
-				__raw_writel(0, bank->base +
-						OMAP24XX_GPIO_CTRL);
-			}
-			if (cpu_is_omap24xx() &&
-			    i < ARRAY_SIZE(non_wakeup_gpios))
-				bank->non_wakeup_gpios = non_wakeup_gpios[i];
-			gpio_count = 32;
-		}
-#endif
-
-		bank->mod_usage = 0;
-		/* REVISIT eventually switch from OMAP-specific gpio structs
-		 * over to the generic ones
-		 */
-		bank->chip.request = omap_gpio_request;
-		bank->chip.free = omap_gpio_free;
-		bank->chip.direction_input = gpio_input;
-		bank->chip.get = gpio_get;
-		bank->chip.direction_output = gpio_output;
-		bank->chip.set_debounce = gpio_debounce;
-		bank->chip.set = gpio_set;
-		bank->chip.to_irq = gpio_2irq;
-		if (bank_is_mpuio(bank)) {
-			bank->chip.label = "mpuio";
-#ifdef CONFIG_ARCH_OMAP16XX
-			bank->chip.dev = &omap_mpuio_device.dev;
-#endif
-			bank->chip.base = OMAP_MPUIO(0);
-		} else {
-			bank->chip.label = "gpio";
-			bank->chip.base = gpio;
-			gpio += gpio_count;
-		}
-		bank->chip.ngpio = gpio_count;
-
-		gpiochip_add(&bank->chip);
-
-		for (j = bank->virtual_irq_start;
-		     j < bank->virtual_irq_start + gpio_count; j++) {
-			lockdep_set_class(&irq_desc[j].lock, &gpio_lock_class);
-			set_irq_chip_data(j, bank);
-			if (bank_is_mpuio(bank))
-				set_irq_chip(j, &mpuio_irq_chip);
-			else
-				set_irq_chip(j, &gpio_irq_chip);
-			set_irq_handler(j, handle_simple_irq);
-			set_irq_flags(j, IRQF_VALID);
-		}
-		set_irq_chained_handler(bank->irq, gpio_irq_handler);
-		set_irq_data(bank->irq, bank);
+		omap_gpio_mod_init(bank, i);
+		omap_gpio_chip_init(bank);
 
 		if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
 			sprintf(clk_name, "gpio%d_dbck", i + 1);
@@ -1950,17 +1963,6 @@ static int __init _omap_gpio_init(void)
 		}
 	}
 
-	/* Enable system clock for GPIO module.
-	 * The CAM_CLK_CTRL *is* really the right place. */
-	if (cpu_is_omap16xx())
-		omap_writel(omap_readl(ULPD_CAM_CLK_CTRL) | 0x04, ULPD_CAM_CLK_CTRL);
-
-	/* Enable autoidle for the OCP interface */
-	if (cpu_is_omap24xx())
-		omap_writel(1 << 0, 0x48019010);
-	if (cpu_is_omap34xx())
-		omap_writel(1 << 0, 0x48306814);
-
 	omap_gpio_show_rev();
 
 	return 0;