[ARM] 4668/1: ep93xx: implement new GPIO API

Implement new GPIO API for ep93xx platform as defined in Documentation/gpio.txt
and provide transitional __deprecated wrappers for the previous gpio_line_*
functions.

Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>
Acked-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

3 files changed, 111 insertions, 29 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a04f507e7f2..97e58a1863c 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -217,6 +217,7 @@ config ARCH_EP93XX
 	bool "EP93xx-based"
 	select ARM_AMBA
 	select ARM_VIC
+	select GENERIC_GPIO
 	help
 	  This enables support for the Cirrus EP93xx series of CPUs.
 
diff --git a/arch/arm/mach-ep93xx/core.c b/arch/arm/mach-ep93xx/core.c
index 70b2c780111..8a734066137 100644
--- a/arch/arm/mach-ep93xx/core.c
+++ b/arch/arm/mach-ep93xx/core.c
@@ -188,7 +188,7 @@ static unsigned char data_direction_register_offset[8] = {
 	0x10, 0x14, 0x18, 0x1c, 0x24, 0x34, 0x3c, 0x44,
 };
 
-void gpio_line_config(int line, int direction)
+static void ep93xx_gpio_set_direction(unsigned line, int direction)
 {
 	unsigned int data_direction_register;
 	unsigned long flags;
@@ -219,39 +219,64 @@ void gpio_line_config(int line, int direction)
 	}
 	local_irq_restore(flags);
 }
+
+void __deprecated gpio_line_config(int line, int direction)
+{
+	ep93xx_gpio_set_direction(line, direction);
+}
 EXPORT_SYMBOL(gpio_line_config);
 
-int gpio_line_get(int line)
+int gpio_direction_input(unsigned gpio)
+{
+	if (gpio > EP93XX_GPIO_LINE_H(7))
+		return -EINVAL;
+
+	ep93xx_gpio_set_direction(gpio, GPIO_IN);
+
+	return 0;
+}
+EXPORT_SYMBOL(gpio_direction_input);
+
+int gpio_direction_output(unsigned gpio, int value)
+{
+	if (gpio > EP93XX_GPIO_LINE_H(7))
+		return -EINVAL;
+
+	gpio_set_value(gpio, value);
+	ep93xx_gpio_set_direction(gpio, GPIO_OUT);
+
+	return 0;
+}
+EXPORT_SYMBOL(gpio_direction_output);
+
+int gpio_get_value(unsigned gpio)
 {
 	unsigned int data_register;
 
-	data_register = EP93XX_GPIO_REG(data_register_offset[line >> 3]);
+	data_register = EP93XX_GPIO_REG(data_register_offset[gpio >> 3]);
 
-	return !!(__raw_readb(data_register) & (1 << (line & 7)));
+	return !!(__raw_readb(data_register) & (1 << (gpio & 7)));
 }
-EXPORT_SYMBOL(gpio_line_get);
+EXPORT_SYMBOL(gpio_get_value);
 
-void gpio_line_set(int line, int value)
+void gpio_set_value(unsigned gpio, int value)
 {
 	unsigned int data_register;
 	unsigned long flags;
 	unsigned char v;
 
-	data_register = EP93XX_GPIO_REG(data_register_offset[line >> 3]);
+	data_register = EP93XX_GPIO_REG(data_register_offset[gpio >> 3]);
 
 	local_irq_save(flags);
-	if (value == EP93XX_GPIO_HIGH) {
-		v = __raw_readb(data_register);
-		v |= 1 << (line & 7);
-		__raw_writeb(v, data_register);
-	} else if (value == EP93XX_GPIO_LOW) {
-		v = __raw_readb(data_register);
-		v &= ~(1 << (line & 7));
-		__raw_writeb(v, data_register);
-	}
+	v = __raw_readb(data_register);
+	if (value)
+		v |= 1 << (gpio & 7);
+	else
+		v &= ~(1 << (gpio & 7));
+	__raw_writeb(v, data_register);
 	local_irq_restore(flags);
 }
-EXPORT_SYMBOL(gpio_line_set);
+EXPORT_SYMBOL(gpio_set_value);
 
 
 /*************************************************************************
@@ -334,9 +359,9 @@ static int ep93xx_gpio_irq_type(unsigned int irq, unsigned int type)
 
 	line = irq - IRQ_EP93XX_GPIO(0);
 	if (line >= 0 && line < 16) {
-		gpio_line_config(line, GPIO_IN);
+		ep93xx_gpio_set_direction(line, GPIO_IN);
 	} else {
-		gpio_line_config(EP93XX_GPIO_LINE_F(line-16), GPIO_IN);
+		ep93xx_gpio_set_direction(EP93XX_GPIO_LINE_F(line-16), GPIO_IN);
 	}
 
 	port = line >> 3;
diff --git a/include/asm-arm/arch-ep93xx/gpio.h b/include/asm-arm/arch-ep93xx/gpio.h
index 1ee14a14cba..fc1e57db5fa 100644
--- a/include/asm-arm/arch-ep93xx/gpio.h
+++ b/include/asm-arm/arch-ep93xx/gpio.h
@@ -5,16 +5,6 @@
 #ifndef __ASM_ARCH_GPIO_H
 #define __ASM_ARCH_GPIO_H
 
-#define GPIO_IN				0
-#define GPIO_OUT			1
-
-#define EP93XX_GPIO_LOW			0
-#define EP93XX_GPIO_HIGH		1
-
-extern void gpio_line_config(int line, int direction);
-extern int  gpio_line_get(int line);
-extern void gpio_line_set(int line, int value);
-
 /* GPIO port A.  */
 #define EP93XX_GPIO_LINE_A(x)		((x) + 0)
 #define EP93XX_GPIO_LINE_EGPIO0		EP93XX_GPIO_LINE_A(0)
@@ -103,5 +93,71 @@ extern void gpio_line_set(int line, int value);
 #define EP93XX_GPIO_LINE_DD6		EP93XX_GPIO_LINE_H(6)
 #define EP93XX_GPIO_LINE_DD7		EP93XX_GPIO_LINE_H(7)
 
+/* new generic GPIO API - see Documentation/gpio.txt */
+
+static inline int gpio_request(unsigned gpio, const char *label)
+{
+	if (gpio > EP93XX_GPIO_LINE_H(7))
+		return -EINVAL;
+	return 0;
+}
+
+static inline void gpio_free(unsigned gpio)
+{
+}
+
+int gpio_direction_input(unsigned gpio);
+int gpio_direction_output(unsigned gpio, int value);
+int gpio_get_value(unsigned gpio);
+void gpio_set_value(unsigned gpio, int value);
+
+#include <asm-generic/gpio.h> /* cansleep wrappers */
+
+/*
+ * Map GPIO A0..A7  (0..7)  to irq 64..71,
+ *          B0..B7  (7..15) to irq 72..79, and
+ *          F0..F7 (40..47) to irq 80..87.
+ */
+
+static inline int gpio_to_irq(unsigned gpio)
+{
+	if (gpio <= EP93XX_GPIO_LINE_EGPIO15)
+		return 64 + gpio;
+
+	if (gpio >= EP93XX_GPIO_LINE_F(0) && gpio <= EP93XX_GPIO_LINE_F(7))
+		return 80 + (gpio - EP93XX_GPIO_LINE_F(0));
+
+	return -EINVAL;
+}
+
+static inline int irq_to_gpio(unsigned irq)
+{
+	if (irq >= 64 && irq <= 79)
+		return irq - 64;
+
+	if (irq >= 80 && irq <= 87)
+		return (irq - 80) + EP93XX_GPIO_LINE_F(0);
+
+	return -EINVAL;
+}
+
+/* obsolete specific GPIO API */
+#define GPIO_IN				0
+#define GPIO_OUT			1
+
+#define EP93XX_GPIO_LOW			0
+#define EP93XX_GPIO_HIGH		1
+
+void __deprecated gpio_line_config(int line, int direction);
+
+static inline int  __deprecated gpio_line_get(int line)
+{
+	return gpio_get_value(line);
+}
+
+static inline void __deprecated gpio_line_set(int line, int value)
+{
+	gpio_set_value(line, value);
+}
 
 #endif