arch/x86/acpigen: Provide helper functions for enabling/disabling GPIO
In order to allow GPIOs to be set/clear according to their polarity,
provide helper functions that check for polarity and call set/clear
SoC functions for generating ACPI code.
BUG=None
BRANCH=None
TEST=Verified that the ACPI code generated remains the same as before
for reef.
Change-Id: Ie8bdb9dc18e61a4a658f1447d6f1db0b166d9c12
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/18427
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)
diff --git a/src/arch/x86/acpigen.c b/src/arch/x86/acpigen.c
index 8ebdd09..d3ec05f 100644
--- a/src/arch/x86/acpigen.c
+++ b/src/arch/x86/acpigen.c
@@ -1299,3 +1299,26 @@
acpigen_write_debug_string("clear_tx_gpio not available");
return -1;
}
+
+/*
+ * Helper functions for enabling/disabling Tx GPIOs based on the GPIO
+ * polarity. These functions end up calling acpigen_soc_{set,clear}_tx_gpio to
+ * make callbacks into SoC acpigen code.
+ *
+ * Returns 0 on success and -1 on error.
+ */
+int acpigen_enable_tx_gpio(struct acpi_gpio *gpio)
+{
+ if (gpio->polarity == ACPI_GPIO_ACTIVE_HIGH)
+ return acpigen_soc_set_tx_gpio(gpio->pins[0]);
+ else
+ return acpigen_soc_clear_tx_gpio(gpio->pins[0]);
+}
+
+int acpigen_disable_tx_gpio(struct acpi_gpio *gpio)
+{
+ if (gpio->polarity == ACPI_GPIO_ACTIVE_LOW)
+ return acpigen_soc_set_tx_gpio(gpio->pins[0]);
+ else
+ return acpigen_soc_clear_tx_gpio(gpio->pins[0]);
+}