diff options
| author | Aaron Durbin <adurbin@chromium.org> | 2013-06-21 13:37:23 -0500 |
|---|---|---|
| committer | Ronald G. Minnich <rminnich@gmail.com> | 2013-12-05 20:14:01 +0100 |
| commit | 550bcca6021f475d4ad7dd2c73d6bc4b5a93f94a (patch) | |
| tree | 488eaa722dac090f7bc2bfda971b0e12f2ef0cdd /src/southbridge/intel | |
| parent | ab365af0a05e391d1e20e39e8bfb61c023b0a678 (diff) | |
| download | coreboot-550bcca6021f475d4ad7dd2c73d6bc4b5a93f94a.tar.xz | |
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>
Diffstat (limited to 'src/southbridge/intel')
| -rw-r--r-- | src/southbridge/intel/lynxpoint/gpio.c | 19 | ||||
| -rw-r--r-- | src/southbridge/intel/lynxpoint/lp_gpio.c | 7 | ||||
| -rw-r--r-- | src/southbridge/intel/lynxpoint/pch.h | 2 |
3 files changed, 28 insertions, 0 deletions
diff --git a/src/southbridge/intel/lynxpoint/gpio.c b/src/southbridge/intel/lynxpoint/gpio.c index 147a1c013b..c6d6a1522a 100644 --- a/src/southbridge/intel/lynxpoint/gpio.c +++ b/src/southbridge/intel/lynxpoint/gpio.c @@ -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)); +} diff --git a/src/southbridge/intel/lynxpoint/lp_gpio.c b/src/southbridge/intel/lynxpoint/lp_gpio.c index 7d1a28d73c..cb052b22c3 100644 --- a/src/southbridge/intel/lynxpoint/lp_gpio.c +++ b/src/southbridge/intel/lynxpoint/lp_gpio.c @@ -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); +} diff --git a/src/southbridge/intel/lynxpoint/pch.h b/src/southbridge/intel/lynxpoint/pch.h index d1fbbe75bd..8ef7918df9 100644 --- a/src/southbridge/intel/lynxpoint/pch.h +++ b/src/southbridge/intel/lynxpoint/pch.h @@ -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 |