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x86: gpio: Add support for obtaining ACPI info for a GPIO

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Implement the method that converts a GPIO into the form used by ACPI, so
that GPIOs can be added to ACPI tables.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2020-07-07 21:32:26 -06:00 committed by Bin Meng
parent eb2ebbcf56
commit 43ee86cc4b
1 changed files with 34 additions and 0 deletions
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34
drivers/gpio/intel_gpio.c
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@ -12,6 +12,7 @@
#include <pch.h>
#include <pci.h>
#include <syscon.h>
#include <acpi/acpi_device.h>
#include <asm/cpu.h>
#include <asm/gpio.h>
#include <asm/intel_pinctrl.h>
@ -19,6 +20,7 @@
#include <asm/io.h>
#include <asm/pci.h>
#include <asm/arch/gpio.h>
#include <dm/acpi.h>
#include <dt-bindings/gpio/x86-gpio.h>
static int intel_gpio_direction_input(struct udevice *dev, uint offset)
@ -128,6 +130,35 @@ static int intel_gpio_xlate(struct udevice *orig_dev, struct gpio_desc *desc,
return 0;
}
#if CONFIG_IS_ENABLED(ACPIGEN)
static int intel_gpio_get_acpi(const struct gpio_desc *desc,
struct acpi_gpio *gpio)
{
struct udevice *pinctrl;
int ret;
if (!dm_gpio_is_valid(desc))
return -ENOENT;
pinctrl = dev_get_parent(desc->dev);
memset(gpio, '\0', sizeof(*gpio));
gpio->type = ACPI_GPIO_TYPE_IO;
gpio->pull = ACPI_GPIO_PULL_DEFAULT;
gpio->io_restrict = ACPI_GPIO_IO_RESTRICT_OUTPUT;
gpio->polarity = ACPI_GPIO_ACTIVE_HIGH;
gpio->pin_count = 1;
gpio->pins[0] = intel_pinctrl_get_acpi_pin(pinctrl, desc->offset);
gpio->pin0_addr = intel_pinctrl_get_config_reg_addr(pinctrl,
desc->offset);
ret = acpi_get_path(pinctrl, gpio->resource, sizeof(gpio->resource));
if (ret)
return log_msg_ret("resource", ret);
return 0;
}
#endif
static int intel_gpio_probe(struct udevice *dev)
{
return 0;
@ -152,6 +183,9 @@ static const struct dm_gpio_ops gpio_intel_ops = {
.set_value = intel_gpio_set_value,
.get_function = intel_gpio_get_function,
.xlate = intel_gpio_xlate,
#if CONFIG_IS_ENABLED(ACPIGEN)
.get_acpi = intel_gpio_get_acpi,
#endif
};
static const struct udevice_id intel_intel_gpio_ids[] = {