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MX31: add accessor function to get a gpio 

The patch adds an accessor function to get the value of a gpio.

Signed-off-by: Stefano Babic <sbabic@denx.de>
This commit is contained in:
Stefano Babic 2010-04-13 12:07:00 +02:00 committed by trix
parent dfe83352cb
commit 7d27cd08b4
2 changed files with 20 additions and 0 deletions
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5
arch/arm/include/asm/arch-mx31/mx31.h
View File

@ -37,12 +37,17 @@ enum mx31_gpio_direction {
extern int mx31_gpio_direction(unsigned int gpio,
enum mx31_gpio_direction direction);
extern void mx31_gpio_set(unsigned int gpio, unsigned int value);
extern int mx31_gpio_get(unsigned int gpio);
#else
static inline int mx31_gpio_direction(unsigned int gpio,
enum mx31_gpio_direction direction)
{
return 1;
}
static inline int mx31_gpio_get(unsigned int gpio)
{
return 1;
}
static inline void mx31_gpio_set(unsigned int gpio, unsigned int value)
{
}

15
drivers/gpio/mx31_gpio.c
View File

@ -71,3 +71,18 @@ void mx31_gpio_set(unsigned int gpio, unsigned int value)
l &= ~(1 << gpio);
__REG(gpio_ports[port] + GPIO_DR) = l;
}
int mx31_gpio_get(unsigned int gpio)
{
unsigned int port = gpio >> 5;
u32 l;
if (port >= ARRAY_SIZE(gpio_ports))
return -1;
gpio &= 0x1f;
l = (__REG(gpio_ports[port] + GPIO_DR) >> gpio) & 0x01;
return l;
}