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>

1 files changed, 7 insertions, 0 deletions

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);
+}