IMX: uniform GPIO interface using GPIO framework

IMX processors has a slightly different interface
to access GPIOs and do not make use of the provided GPIO
framework. The patch substitutes mxc_ specific
functions and make use of the API in asm/gpio.h

Signed-off-by: Stefano Babic <sbabic@denx.de>

2 files changed, 51 insertions, 8 deletions

diff --git a/drivers/gpio/mxc_gpio.c b/drivers/gpio/mxc_gpio.c
index 6efbb02c16..a7f36b2933 100644
--- a/drivers/gpio/mxc_gpio.c
+++ b/drivers/gpio/mxc_gpio.c
@@ -2,6 +2,9 @@
  * Copyright (C) 2009
  * Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
  *
+ * Copyright (C) 2011
+ * Stefano Babic, DENX Software Engineering, <sbabic@denx.de>
+ *
  * See file CREDITS for list of people who contributed to this
  * project.
  *
@@ -22,10 +25,16 @@
  */
 #include <common.h>
 #include <asm/arch/imx-regs.h>
+#include <asm/gpio.h>
 #include <asm/io.h>
-#include <mxc_gpio.h>
 #include <errno.h>
 
+enum mxc_gpio_direction {
+	MXC_GPIO_DIRECTION_IN,
+	MXC_GPIO_DIRECTION_OUT,
+};
+
+
 /* GPIO port description */
 static unsigned long gpio_ports[] = {
 	[0] = GPIO1_BASE_ADDR,
@@ -41,7 +50,8 @@ static unsigned long gpio_ports[] = {
 #endif
 };
 
-int mxc_gpio_direction(unsigned int gpio, enum mxc_gpio_direction direction)
+static int mxc_gpio_direction(unsigned int gpio,
+	enum mxc_gpio_direction direction)
 {
 	unsigned int port = gpio >> 5;
 	struct gpio_regs *regs;
@@ -68,7 +78,7 @@ int mxc_gpio_direction(unsigned int gpio, enum mxc_gpio_direction direction)
 	return 0;
 }
 
-void mxc_gpio_set(unsigned int gpio, unsigned int value)
+void gpio_set_value(int gpio, int value)
 {
 	unsigned int port = gpio >> 5;
 	struct gpio_regs *regs;
@@ -89,7 +99,7 @@ void mxc_gpio_set(unsigned int gpio, unsigned int value)
 	writel(l, &regs->gpio_dr);
 }
 
-int mxc_gpio_get(unsigned int gpio)
+int gpio_get_value(int gpio)
 {
 	unsigned int port = gpio >> 5;
 	struct gpio_regs *regs;
@@ -106,3 +116,36 @@ int mxc_gpio_get(unsigned int gpio)
 
 	return l;
 }
+
+int gpio_request(int gp, const char *label)
+{
+	unsigned int port = gp >> 5;
+	if (port >= ARRAY_SIZE(gpio_ports))
+		return -EINVAL;
+	return 0;
+}
+
+void gpio_free(int gp)
+{
+}
+
+void gpio_toggle_value(int gp)
+{
+	gpio_set_value(gp, !gpio_get_value(gp));
+}
+
+int gpio_direction_input(int gp)
+{
+	return mxc_gpio_direction(gp, MXC_GPIO_DIRECTION_IN);
+}
+
+int gpio_direction_output(int gp, int value)
+{
+	int ret = mxc_gpio_direction(gp, MXC_GPIO_DIRECTION_OUT);
+
+	if (ret < 0)
+		return ret;
+
+	gpio_set_value(gp, value);
+	return 0;
+}
diff --git a/drivers/spi/mxc_spi.c b/drivers/spi/mxc_spi.c
index 81381d9b9a..2fa748608f 100644
--- a/drivers/spi/mxc_spi.c
+++ b/drivers/spi/mxc_spi.c
@@ -23,7 +23,7 @@
 #include <spi.h>
 #include <asm/errno.h>
 #include <asm/io.h>
-#include <mxc_gpio.h>
+#include <asm/gpio.h>
 #include <asm/arch/imx-regs.h>
 #include <asm/arch/clock.h>
 
@@ -145,14 +145,14 @@ void spi_cs_activate(struct spi_slave *slave)
 {
 	struct mxc_spi_slave *mxcs = to_mxc_spi_slave(slave);
 	if (mxcs->gpio > 0)
-		mxc_gpio_set(mxcs->gpio, mxcs->ss_pol);
+		gpio_set_value(mxcs->gpio, mxcs->ss_pol);
 }
 
 void spi_cs_deactivate(struct spi_slave *slave)
 {
 	struct mxc_spi_slave *mxcs = to_mxc_spi_slave(slave);
 	if (mxcs->gpio > 0)
-		mxc_gpio_set(mxcs->gpio,
+		gpio_set_value(mxcs->gpio,
 			      !(mxcs->ss_pol));
 }
 
@@ -468,7 +468,7 @@ static int decode_cs(struct mxc_spi_slave *mxcs, unsigned int cs)
 	if (cs > 3) {
 		mxcs->gpio = cs >> 8;
 		cs &= 3;
-		ret = mxc_gpio_direction(mxcs->gpio, OUT);
+		ret = gpio_direction_output(mxcs->gpio, 0);
 		if (ret) {
 			printf("mxc_spi: cannot setup gpio %d\n", mxcs->gpio);
 			return -EINVAL;