gpio/mxc: convert gpio-mxc to use basic_mmio_gpio library

The gpio-mxc controller complies with basic_mmio_gpio library.  The
patch convert the driver to use the library.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

drivers/gpio/Kconfig

@@ -100,6 +100,7 @@ config GPIO_MXS
 config GPIO_MXC
 	def_bool y
 	depends on ARCH_MXC
+	select GPIO_BASIC_MMIO_CORE
 
 config GPIO_PLAT_SAMSUNG
 	bool "Samsung SoCs GPIO library support"

drivers/gpio/gpio-mxc.c

@@ -26,6 +26,7 @@
 #include <linux/gpio.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
+#include <linux/basic_mmio_gpio.h>
 #include <mach/hardware.h>
 #include <asm-generic/bug.h>
 
@@ -35,9 +36,8 @@ struct mxc_gpio_port {
 	int irq;
 	int irq_high;
 	int virtual_irq_start;
-	struct gpio_chip chip;
+	struct bgpio_chip bgc;
 	u32 both_edges;
-	spinlock_t lock;
 };
 
 /*
@@ -101,8 +101,6 @@ static void gpio_unmask_irq(struct irq_data *d)
 	_set_gpio_irqenable(port, gpio & 0x1f, 1);
 }
 
-static int mxc_gpio_get(struct gpio_chip *chip, unsigned offset);
-
 static int gpio_set_irq_type(struct irq_data *d, u32 type)
 {
 	u32 gpio = irq_to_gpio(d->irq);
@@ -120,7 +118,7 @@ static int gpio_set_irq_type(struct irq_data *d, u32 type)
 		edge = GPIO_INT_FALL_EDGE;
 		break;
 	case IRQ_TYPE_EDGE_BOTH:
-		val = mxc_gpio_get(&port->chip, gpio & 31);
+		val = gpio_get_value(gpio & 31);
 		if (val) {
 			edge = GPIO_INT_LOW_LEV;
 			pr_debug("mxc: set GPIO %d to low trigger\n", gpio);
@@ -259,60 +257,6 @@ static struct irq_chip gpio_irq_chip = {
 	.irq_set_wake = gpio_set_wake_irq,
 };
 
-static void _set_gpio_direction(struct gpio_chip *chip, unsigned offset,
-				int dir)
-{
-	struct mxc_gpio_port *port =
-		container_of(chip, struct mxc_gpio_port, chip);
-	u32 l;
-	unsigned long flags;
-
-	spin_lock_irqsave(&port->lock, flags);
-	l = readl(port->base + GPIO_GDIR);
-	if (dir)
-		l |= 1 << offset;
-	else
-		l &= ~(1 << offset);
-	writel(l, port->base + GPIO_GDIR);
-	spin_unlock_irqrestore(&port->lock, flags);
-}
-
-static void mxc_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
-{
-	struct mxc_gpio_port *port =
-		container_of(chip, struct mxc_gpio_port, chip);
-	void __iomem *reg = port->base + GPIO_DR;
-	u32 l;
-	unsigned long flags;
-
-	spin_lock_irqsave(&port->lock, flags);
-	l = (readl(reg) & (~(1 << offset))) | (!!value << offset);
-	writel(l, reg);
-	spin_unlock_irqrestore(&port->lock, flags);
-}
-
-static int mxc_gpio_get(struct gpio_chip *chip, unsigned offset)
-{
-	struct mxc_gpio_port *port =
-		container_of(chip, struct mxc_gpio_port, chip);
-
-	return (readl(port->base + GPIO_PSR) >> offset) & 1;
-}
-
-static int mxc_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
-{
-	_set_gpio_direction(chip, offset, 0);
-	return 0;
-}
-
-static int mxc_gpio_direction_output(struct gpio_chip *chip,
-				     unsigned offset, int value)
-{
-	mxc_gpio_set(chip, offset, value);
-	_set_gpio_direction(chip, offset, 1);
-	return 0;
-}
-
 /*
  * This lock class tells lockdep that GPIO irqs are in a different
  * category than their parents, so it won't report false recursion.
@@ -385,24 +329,25 @@ static int __devinit mxc_gpio_probe(struct platform_device *pdev)
 		}
 	}
 
-	/* register gpio chip */
-	port->chip.direction_input = mxc_gpio_direction_input;
-	port->chip.direction_output = mxc_gpio_direction_output;
-	port->chip.get = mxc_gpio_get;
-	port->chip.set = mxc_gpio_set;
-	port->chip.base = pdev->id * 32;
-	port->chip.ngpio = 32;
+	err = bgpio_init(&port->bgc, &pdev->dev, 4,
+			 port->base + GPIO_PSR,
+			 port->base + GPIO_DR, NULL,
+			 port->base + GPIO_GDIR, NULL, false);
+	if (err)
+		goto out_iounmap;
 
-	spin_lock_init(&port->lock);
+	port->bgc.gc.base = pdev->id * 32;
 
-	err = gpiochip_add(&port->chip);
+	err = gpiochip_add(&port->bgc.gc);
 	if (err)
-		goto out_iounmap;
+		goto out_bgpio_remove;
 
 	list_add_tail(&port->node, &mxc_gpio_ports);
 
 	return 0;
 
+out_bgpio_remove:
+	bgpio_remove(&port->bgc);
 out_iounmap:
 	iounmap(port->base);
 out_release_mem: