[ARM] 3371/1: ep93xx: gpio support

Patch from Lennert Buytenhek

Add support for setting the direction of and getting/setting the
value of the 64 GPIO lines.

Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 68 insertions, 0 deletions

diff --git a/arch/arm/mach-ep93xx/core.c b/arch/arm/mach-ep93xx/core.c
index f831f74dc8cc..7d3e79990fad 100644
--- a/arch/arm/mach-ep93xx/core.c
+++ b/arch/arm/mach-ep93xx/core.c
@@ -45,6 +45,7 @@
 #include <asm/mach/map.h>
 #include <asm/mach/time.h>
 #include <asm/mach/irq.h>
+#include <asm/arch/gpio.h>
 
 #include <asm/hardware/vic.h>
 
@@ -147,6 +148,73 @@ struct sys_timer ep93xx_timer = {
 
 
 /*************************************************************************
+ * GPIO handling for EP93xx
+ *************************************************************************/
+static unsigned char data_register_offset[8] = {
+        0x00, 0x04, 0x08, 0x0c, 0x20, 0x30, 0x38, 0x40,
+};
+
+static unsigned char data_direction_register_offset[8] = {
+        0x10, 0x14, 0x18, 0x1c, 0x24, 0x34, 0x3c, 0x44,
+};
+
+void gpio_line_config(int line, int direction)
+{
+        unsigned int data_direction_register;
+        unsigned long flags;
+        unsigned char v;
+
+        data_direction_register =
+                EP93XX_GPIO_REG(data_direction_register_offset[line >> 3]);
+
+        local_irq_save(flags);
+        if (direction == GPIO_OUT) {
+                v = __raw_readb(data_direction_register);
+                v |= 1 << (line & 7);
+                __raw_writeb(v, data_direction_register);
+        } else if (direction == GPIO_IN) {
+                v = __raw_readb(data_direction_register);
+                v &= ~(1 << (line & 7));
+                __raw_writeb(v, data_direction_register);
+        }
+        local_irq_restore(flags);
+}
+EXPORT_SYMBOL(gpio_line_config);
+
+int gpio_line_get(int line)
+{
+        unsigned int data_register;
+
+        data_register = EP93XX_GPIO_REG(data_register_offset[line >> 3]);
+
+        return !!(__raw_readb(data_register) & (1 << (line & 7)));
+}
+EXPORT_SYMBOL(gpio_line_get);
+
+void gpio_line_set(int line, int value)
+{
+        unsigned int data_register;
+        unsigned long flags;
+        unsigned char v;
+
+        data_register = EP93XX_GPIO_REG(data_register_offset[line >> 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);
+        }
+        local_irq_restore(flags);
+}
+EXPORT_SYMBOL(gpio_line_set);
+
+
+/*************************************************************************
  * EP93xx IRQ handling
  *************************************************************************/
 void __init ep93xx_init_irq(void)