From a8e19667a42d752f3eca6eaa17aa5d6f93066dfe Mon Sep 17 00:00:00 2001 From: Lennert Buytenhek Date: Mon, 20 Mar 2006 17:10:14 +0000 Subject: [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 Signed-off-by: Russell King --- arch/arm/mach-ep93xx/core.c | 68 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 68 insertions(+) (limited to 'arch/arm/mach-ep93xx') 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 #include #include +#include #include @@ -146,6 +147,73 @@ 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 *************************************************************************/ -- cgit v1.2.3