lynxpoint: provide gpio_is_native()

There's a need to determine if a specific gpio pin is
is set up to be a native function or not. Implement this.

Change-Id: I91d57a549e0f4fddc0b1849e5f74320fc839642c
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/59589
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: http://review.coreboot.org/4324
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
This commit is contained in:
Aaron Durbin 2013-06-21 13:37:23 -05:00 committed by Ronald G. Minnich
parent ab365af0a0
commit 550bcca602
3 changed files with 28 additions and 0 deletions

View File

@ -128,3 +128,22 @@ void set_gpio(int gpio_num, int value)
config |= value << bit;
outl(config, gpio_base + gpio_reg_offsets[index]);
}
int gpio_is_native(int gpio_num)
{
static const int gpio_reg_offsets[] = {
GPIO_USE_SEL, GPIO_USE_SEL2, GPIO_USE_SEL3
};
u16 gpio_base = get_gpio_base();
int index, bit;
u32 config;
if (gpio_num > MAX_GPIO_NUMBER)
return 0; /* Just ignore wrong gpio numbers. */
index = gpio_num / 32;
bit = gpio_num % 32;
config = inl(gpio_base + gpio_reg_offsets[index]);
return !(config & (1 << bit));
}

View File

@ -159,3 +159,10 @@ void set_gpio(int gpio_num, int value)
conf0 |= value << GPO_LEVEL_SHIFT;
outl(conf0, gpio_base + GPIO_CONFIG0(gpio_num));
}
int gpio_is_native(int gpio_num)
{
u16 gpio_base = get_gpio_base();
return !(inl(gpio_base + GPIO_CONFIG0(gpio_num)) & 1);
}

View File

@ -201,6 +201,8 @@ unsigned get_gpios(const int *gpio_num_array);
* set GPIO pin value
*/
void set_gpio(int gpio_num, int value);
/* Return non-zero if gpio is set to native function. 0 otherwise. */
int gpio_is_native(int gpio_num);
#endif
#define MAINBOARD_POWER_OFF 0