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gpio: Add a method to convert a GPIO to ACPI

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When generating ACPI tables we need to convert GPIOs in U-Boot to the ACPI
structures required by ACPI. This is a SoC-specific conversion and cannot
be handled by generic code, so add a new GPIO method to do the conversion.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass
2020-07-07 13:11:44 -06:00
committed by Bin Meng
parent ff715c6f4f
commit 2912686c08
5 changed files with 278 additions and 0 deletions
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77
drivers/gpio/sandbox.c
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@@ -8,7 +8,9 @@
#include <fdtdec.h>
#include <log.h>
#include <malloc.h>
#include <acpi/acpi_device.h>
#include <asm/gpio.h>
#include <dm/acpi.h>
#include <dm/device_compat.h>
#include <dm/lists.h>
#include <dm/of.h>
@@ -197,6 +199,63 @@ static int sb_gpio_get_dir_flags(struct udevice *dev, unsigned int offset,
return 0;
}
#if CONFIG_IS_ENABLED(ACPIGEN)
static int sb_gpio_get_acpi(const struct gpio_desc *desc,
struct acpi_gpio *gpio)
{
int ret;
/* Note that gpio_get_acpi() zeroes *gpio before calling here */
gpio->pin_count = 1;
gpio->pins[0] = desc->offset;
ret = acpi_device_scope(desc->dev, gpio->resource,
sizeof(gpio->resource));
if (ret)
return log_ret(ret);
/* All of these values are just used for testing */
if (desc->flags & GPIOD_ACTIVE_LOW) {
gpio->pin0_addr = 0x80012 + desc->offset;
gpio->type = ACPI_GPIO_TYPE_INTERRUPT;
gpio->pull = ACPI_GPIO_PULL_DOWN;
gpio->interrupt_debounce_timeout = 4321;
/* We use the GpioInt part */
gpio->irq.pin = desc->offset;
gpio->irq.polarity = ACPI_IRQ_ACTIVE_BOTH;
gpio->irq.shared = ACPI_IRQ_SHARED;
gpio->irq.wake = ACPI_IRQ_WAKE;
/* The GpioIo part is only used for testing */
gpio->polarity = ACPI_GPIO_ACTIVE_LOW;
} else {
gpio->pin0_addr = 0xc00dc + desc->offset;
gpio->type = ACPI_GPIO_TYPE_IO;
gpio->pull = ACPI_GPIO_PULL_UP;
gpio->interrupt_debounce_timeout = 0;
/* The GpioInt part is not used */
/* We use the GpioIo part */
gpio->output_drive_strength = 1234;
gpio->io_shared = true;
gpio->io_restrict = ACPI_GPIO_IO_RESTRICT_INPUT;
gpio->polarity = 0;
}
return 0;
}
static int sb_gpio_get_name(const struct udevice *dev, char *out_name)
{
return acpi_copy_name(out_name, "GPIO");
}
struct acpi_ops gpio_sandbox_acpi_ops = {
.get_name = sb_gpio_get_name,
};
#endif /* ACPIGEN */
static const struct dm_gpio_ops gpio_sandbox_ops = {
.direction_input = sb_gpio_direction_input,
.direction_output = sb_gpio_direction_output,
@@ -206,6 +265,9 @@ static const struct dm_gpio_ops gpio_sandbox_ops = {
.xlate = sb_gpio_xlate,
.set_dir_flags = sb_gpio_set_dir_flags,
.get_dir_flags = sb_gpio_get_dir_flags,
#if CONFIG_IS_ENABLED(ACPIGEN)
.get_acpi = sb_gpio_get_acpi,
#endif
};
static int sandbox_gpio_ofdata_to_platdata(struct udevice *dev)
@@ -252,6 +314,7 @@ U_BOOT_DRIVER(sandbox_gpio) = {
.probe = gpio_sandbox_probe,
.remove = gpio_sandbox_remove,
.ops = &gpio_sandbox_ops,
ACPI_OPS_PTR(&gpio_sandbox_acpi_ops)
};
U_BOOT_DRIVER_ALIAS(sandbox_gpio, sandbox_gpio_alias)
@@ -421,6 +484,13 @@ static int sb_pinctrl_get_pin_muxing(struct udevice *dev,
return 0;
}
#if CONFIG_IS_ENABLED(ACPIGEN)
static int sb_pinctrl_get_name(const struct udevice *dev, char *out_name)
{
return acpi_copy_name(out_name, "PINC");
}
#endif
static int sandbox_pinctrl_probe(struct udevice *dev)
{
struct sb_pinctrl_priv *priv = dev_get_priv(dev);
@@ -436,6 +506,12 @@ static struct pinctrl_ops sandbox_pinctrl_gpio_ops = {
.get_pin_muxing = sb_pinctrl_get_pin_muxing,
};
#if CONFIG_IS_ENABLED(ACPIGEN)
struct acpi_ops pinctrl_sandbox_acpi_ops = {
.get_name = sb_pinctrl_get_name,
};
#endif
static const struct udevice_id sandbox_pinctrl_gpio_match[] = {
{ .compatible = "sandbox,pinctrl-gpio" },
{ /* sentinel */ }
@@ -449,4 +525,5 @@ U_BOOT_DRIVER(sandbox_pinctrl_gpio) = {
.bind = dm_scan_fdt_dev,
.probe = sandbox_pinctrl_probe,
.priv_auto_alloc_size = sizeof(struct sb_pinctrl_priv),
ACPI_OPS_PTR(&pinctrl_sandbox_acpi_ops)
};