[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>

1 files changed, 66 insertions, 10 deletions

diff --git a/include/asm-arm/arch-ep93xx/gpio.h b/include/asm-arm/arch-ep93xx/gpio.h
index 1ee14a14cba0..fc1e57db5fac 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