add gpio support to atheros, fixes #1861, thanks Othello

[openwrt/svn-archive/archive.git] / 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 (file)
index 0000000..560b8cc
--- /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
+