From 66b7ecf8e0e324c1bd76eb873e128a98a68dd539 Mon Sep 17 00:00:00 2001
From: blogic <blogic@3c298f89-4303-0410-b956-a3cf2f4a3e73>
Date: Thu, 3 Apr 2008 20:28:10 +0000
Subject: add gpio support to atheros, fixes #1861, thanks Othello

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@10724 3c298f89-4303-0410-b956-a3cf2f4a3e73
---
 .../files/include/asm-mips/mach-atheros/gpio.h     | 134 +++++++++++++++++++++
 1 file changed, 134 insertions(+)
 create mode 100644 target/linux/atheros/files/include/asm-mips/mach-atheros/gpio.h

(limited to 'target/linux/atheros/files/include/asm-mips/mach-atheros/gpio.h')

diff --git a/target/linux/atheros/files/include/asm-mips/mach-atheros/gpio.h b/target/linux/atheros/files/include/asm-mips/mach-atheros/gpio.h
new file mode 100644
index 000000000..560b8cc0d
--- /dev/null
+++ b/target/linux/atheros/files/include/asm-mips/mach-atheros/gpio.h
@@ -0,0 +1,134 @@
+#ifndef _ATHEROS_GPIO_H_
+#define _ATHEROS_GPIO_H_
+
+#include "ar531x.h"
+
+/* Common AR531X global variables */
+/* extern u32 ar531x_gpio_intr_Mask; */
+
+/* AR5312 exported routines */
+#ifdef CONFIG_ATHEROS_AR5312
+asmlinkage void ar5312_gpio_irq_dispatch(void);
+#endif
+
+/* AR5315 exported routines */
+#ifdef CONFIG_ATHEROS_AR5315
+asmlinkage void ar5315_gpio_irq_dispatch(void);
+#endif
+
+/*
+ * Wrappers for the generic GPIO layer
+ */
+
+/* Sets a gpio to input, or returns ENXIO for non-existent gpio */
+static inline int gpio_direction_input(unsigned gpio) {
+	DO_AR5312(	if (gpio > AR531X_NUM_GPIO) {			\
+				return -ENXIO;				\
+			} else {					\
+				sysRegWrite(AR531X_GPIO_CR,		\
+					( sysRegRead(AR531X_GPIO_CR) &	\
+					  ~(AR531X_GPIO_CR_M(gpio)) ) |	\
+					  AR531X_GPIO_CR_I(gpio) );	\
+				return 0;				\
+			}						\
+	)
+	DO_AR5315(	if (gpio > AR5315_NUM_GPIO) {			\
+				return -ENXIO;				\
+			} else {					\
+				sysRegWrite(AR5315_GPIO_CR,		\
+					( sysRegRead(AR5315_GPIO_CR) &	\
+					  ~(AR5315_GPIO_CR_M(gpio)) ) |	\
+					  AR5315_GPIO_CR_I(gpio) );	\
+				return 0;				\
+			}						\
+	)
+}
+
+/* Sets a gpio to output with value, or returns ENXIO for non-existent gpio */
+static inline int gpio_direction_output(unsigned gpio, int value) {
+	DO_AR5312(	if (gpio > AR531X_NUM_GPIO) {			\
+				return -ENXIO;				\
+			} else {					\
+				sysRegWrite(AR531X_GPIO_DO,		\
+					( (sysRegRead(AR531X_GPIO_DO) &	\
+					  ~(1 << gpio) ) |		\
+					  ((value!=0) << gpio)) );	\
+				sysRegWrite(AR531X_GPIO_CR,		\
+					sysRegRead(AR531X_GPIO_CR) |	\
+					AR531X_GPIO_CR_O(gpio) );	\
+				return 0;				\
+			}						\
+	)
+	DO_AR5315(	if (gpio > AR5315_NUM_GPIO) {			\
+				return -ENXIO;				\
+			} else {					\
+				sysRegWrite(AR5315_GPIO_DO,		\
+					( (sysRegRead(AR5315_GPIO_DO) &	\
+					  ~(1 << gpio)) |		\
+					  ((value!=0) << gpio)) );	\
+				sysRegWrite(AR5315_GPIO_CR,		\
+					sysRegRead(AR5315_GPIO_CR) |	\
+					AR5315_GPIO_CR_O(gpio) );	\
+				return 0;				\
+			}						\
+	)
+}
+
+/* Reads the gpio pin.  Unchecked function */
+static inline int gpio_get_value(unsigned gpio) {
+	DO_AR5312(return (sysRegRead(AR531X_GPIO_DI) & (1 << gpio));)
+	DO_AR5315(return (sysRegRead(AR5315_GPIO_DI) & (1 << gpio));)
+}
+
+/* Writes to the gpio pin.  Unchecked function */
+static inline void gpio_set_value(unsigned gpio, int value) {
+	DO_AR5312(	sysRegWrite(AR531X_GPIO_DO,	\
+			( (sysRegRead(AR531X_GPIO_DO) &	\
+			  ~(1 << gpio)) |		\
+			  ((value!=0) << gpio)) );	\
+	)
+	DO_AR5315(	sysRegWrite(AR5315_GPIO_DO,	\
+			( (sysRegRead(AR5315_GPIO_DO) &	\
+			  ~(1 << gpio)) |		\
+			  ((value!=0) << gpio)) );	\
+	)
+}
+
+static inline int gpio_request(unsigned gpio, const char *label) {
+	return 0;
+}
+
+static inline void gpio_free(unsigned gpio) {
+}
+
+/* Returns IRQ to attach for gpio.  Unchecked function */
+static inline int gpio_to_irq(unsigned gpio) {
+	return AR531X_GPIO_IRQ(gpio);
+}
+
+/* Returns gpio for IRQ attached.  Unchecked function */
+static inline int irq_to_gpio(unsigned irq) {
+	return (irq - (AR531X_GPIO_IRQ(0)));
+}
+
+/* #include <asm-generic/gpio.h> */ /* cansleep wrappers */
+/* platforms that don't directly support access to GPIOs through I2C, SPI,
+ * or other blocking infrastructure can use these wrappers.
+ */
+
+static inline int gpio_cansleep(unsigned gpio) {
+        return 0;
+}
+
+static inline int gpio_get_value_cansleep(unsigned gpio) {
+        might_sleep();
+        return gpio_get_value(gpio);
+}
+
+static inline void gpio_set_value_cansleep(unsigned gpio, int value) {
+        might_sleep();
+        gpio_set_value(gpio, value);
+}
+
+#endif
+
-- 
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