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arch/x86/acpigen: Provide helper functions for enabling/disabling GPIO

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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)
This commit is contained in:
Furquan Shaikh
2017-02-20 22:56:25 -08:00
committed by Furquan Shaikh
parent 5b9b593f2f
commit bf4845dd3a
4 changed files with 57 additions and 6 deletions
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23
src/arch/x86/acpigen.c
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@@ -1299,3 +1299,26 @@ int __attribute__((weak)) acpigen_soc_clear_tx_gpio(unsigned int gpio_num)
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]);
}