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authorLennert Buytenhek <buytenh@wantstofly.org>2006-03-20 17:10:14 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-03-21 22:06:12 +0000
commita8e19667a42d752f3eca6eaa17aa5d6f93066dfe (patch)
tree7bf3b7eb8ac3fb6c18b3a8c33a88d6d2158f45e4 /arch/arm/mach-ep93xx
parente7736d47a11a771ba87314be563b2cb6b8d11d14 (diff)
[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>
Diffstat (limited to 'arch/arm/mach-ep93xx')
-rw-r--r--arch/arm/mach-ep93xx/core.c68
1 files changed, 68 insertions, 0 deletions
diff --git a/arch/arm/mach-ep93xx/core.c b/arch/arm/mach-ep93xx/core.c
index f831f74dc8c..7d3e79990fa 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)