gpio: Add a method to convert a GPIO to ACPI
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>
diff --git a/drivers/gpio/gpio-uclass.c b/drivers/gpio/gpio-uclass.c
index ab17fa8..9c53299 100644
--- a/drivers/gpio/gpio-uclass.c
+++ b/drivers/gpio/gpio-uclass.c
@@ -13,6 +13,7 @@
#include <errno.h>
#include <fdtdec.h>
#include <malloc.h>
+#include <acpi/acpi_device.h>
#include <asm/gpio.h>
#include <dm/device_compat.h>
#include <linux/bug.h>
@@ -855,6 +856,27 @@
return 0;
}
+#if CONFIG_IS_ENABLED(ACPIGEN)
+int gpio_get_acpi(const struct gpio_desc *desc, struct acpi_gpio *gpio)
+{
+ struct dm_gpio_ops *ops;
+
+ memset(gpio, '\0', sizeof(*gpio));
+ if (!dm_gpio_is_valid(desc)) {
+ /* Indicate that the GPIO is not valid */
+ gpio->pin_count = 0;
+ gpio->pins[0] = 0;
+ return -EINVAL;
+ }
+
+ ops = gpio_get_ops(desc->dev);
+ if (!ops->get_acpi)
+ return -ENOSYS;
+
+ return ops->get_acpi(desc, gpio);
+}
+#endif
+
int gpio_claim_vector(const int *gpio_num_array, const char *fmt)
{
int i, ret;
diff --git a/drivers/gpio/sandbox.c b/drivers/gpio/sandbox.c
index b9a1d65..c2f8047 100644
--- a/drivers/gpio/sandbox.c
+++ b/drivers/gpio/sandbox.c
@@ -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 @@
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 @@
.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 @@
.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)
@@ -420,6 +483,13 @@
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)
{
@@ -435,6 +505,12 @@
.get_pins_count = sb_pinctrl_get_pins_count,
.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" },
@@ -449,4 +525,5 @@
.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)
};