Hi Simon,
On Sun, Jun 14, 2020 at 10:55 AM Simon Glass sjg@chromium.org wrote:
Add a function to write a GPIO descriptor to the generated ACPI code.
Signed-off-by: Simon Glass sjg@chromium.org Reviewed-by: Wolfgang Wallner wolfgang.wallner@br-automation.com
(no changes since v1)
include/acpi/acpi_device.h | 22 ++++++ lib/acpi/acpi_device.c | 151 +++++++++++++++++++++++++++++++++++++ test/dm/acpigen.c | 89 ++++++++++++++++++++++ 3 files changed, 262 insertions(+)
diff --git a/include/acpi/acpi_device.h b/include/acpi/acpi_device.h index cb9166aeae..5f229d79cf 100644 --- a/include/acpi/acpi_device.h +++ b/include/acpi/acpi_device.h @@ -12,6 +12,7 @@ #include <linux/bitops.h>
struct acpi_ctx; +struct gpio_desc; struct irq; struct udevice;
@@ -233,4 +234,25 @@ enum acpi_dev_status acpi_device_status(const struct udevice *dev); int acpi_device_write_interrupt_irq(struct acpi_ctx *ctx, const struct irq *req_irq);
+/**
- acpi_device_write_gpio() - Write GpioIo() or GpioInt() descriptor
- @gpio: GPIO information to write
- @return 0 if OK, -ve on error
- */
+int acpi_device_write_gpio(struct acpi_ctx *ctx, const struct acpi_gpio *gpio);
+/**
- acpi_device_write_gpio_desc() - Write a GPIO to ACPI
- This creates a GPIO descriptor for a GPIO, including information ACPI needs
- to use it. The type is always ACPI_GPIO_TYPE_IO.
Why is the type always ACPI_GPIO_TYPE_IO? Is gpio_get_acpi() supposed to hard code gpio->type to ACPI_GPIO_TYPE_IO?
- @ctx: ACPI context pointer
- @desc: GPIO to write
- @return 0 if OK, -ve on error
- */
+int acpi_device_write_gpio_desc(struct acpi_ctx *ctx,
const struct gpio_desc *desc);#endif diff --git a/lib/acpi/acpi_device.c b/lib/acpi/acpi_device.c index 94f37b8d73..1cc7dd8b37 100644 --- a/lib/acpi/acpi_device.c +++ b/lib/acpi/acpi_device.c @@ -12,6 +12,7 @@ #include <log.h> #include <acpi/acpi_device.h> #include <acpi/acpigen.h> +#include <asm-generic/gpio.h> #include <dm/acpi.h>
/** @@ -204,3 +205,153 @@ int acpi_device_write_interrupt_irq(struct acpi_ctx *ctx,
return 0;}
+/* ACPI 6.3 section 6.4.3.8.1 - GPIO Interrupt or I/O */ +int acpi_device_write_gpio(struct acpi_ctx *ctx, const struct acpi_gpio *gpio) +{
void *start, *desc_length;void *pin_table_offset, *vendor_data_offset, *resource_offset;u16 flags = 0;int pin;if (gpio->type > ACPI_GPIO_TYPE_IO)return -EINVAL;start = acpigen_get_current(ctx);/* Byte 0: Descriptor Type */acpigen_emit_byte(ctx, ACPI_DESCRIPTOR_GPIO);/* Byte 1-2: Length (fill in later) */desc_length = acpi_device_write_zero_len(ctx);/* Byte 3: Revision ID */acpigen_emit_byte(ctx, ACPI_GPIO_REVISION_ID);/* Byte 4: GpioIo or GpioInt */acpigen_emit_byte(ctx, gpio->type);/** Byte 5-6: General Flags* [15:1]: 0 => Reserved* [0]: 1 => ResourceConsumer*/acpigen_emit_word(ctx, 1 << 0);switch (gpio->type) {case ACPI_GPIO_TYPE_INTERRUPT:/** Byte 7-8: GPIO Interrupt Flags* [15:5]: 0 => Reserved* [4]: Wake (0=NO_WAKE 1=WAKE)* [3]: Sharing (0=EXCLUSIVE 1=SHARED)* [2:1]: Polarity (0=HIGH 1=LOW 2=BOTH)* [0]: Mode (0=LEVEL 1=EDGE)*/if (gpio->irq.mode == ACPI_IRQ_EDGE_TRIGGERED)flags |= 1 << 0;if (gpio->irq.shared == ACPI_IRQ_SHARED)flags |= 1 << 3;if (gpio->irq.wake == ACPI_IRQ_WAKE)flags |= 1 << 4;switch (gpio->irq.polarity) {case ACPI_IRQ_ACTIVE_HIGH:flags |= 0 << 1;break;case ACPI_IRQ_ACTIVE_LOW:flags |= 1 << 1;break;case ACPI_IRQ_ACTIVE_BOTH:flags |= 2 << 1;break;}break;case ACPI_GPIO_TYPE_IO:/** Byte 7-8: GPIO IO Flags* [15:4]: 0 => Reserved* [3]: Sharing (0=EXCLUSIVE 1=SHARED)* [2]: 0 => Reserved* [1:0]: IO Restriction* 0 => IoRestrictionNone* 1 => IoRestrictionInputOnly* 2 => IoRestrictionOutputOnly* 3 => IoRestrictionNoneAndPreserve*/flags |= gpio->io_restrict & 3;if (gpio->io_shared)flags |= 1 << 3;break;}acpigen_emit_word(ctx, flags);/** Byte 9: Pin Configuration* 0x01 => Default (no configuration applied)* 0x02 => Pull-up* 0x03 => Pull-down* 0x04-0x7F => Reserved* 0x80-0xff => Vendor defined*/acpigen_emit_byte(ctx, gpio->pull);/* Byte 10-11: Output Drive Strength in 1/100 mA */acpigen_emit_word(ctx, gpio->output_drive_strength);/* Byte 12-13: Debounce Timeout in 1/100 ms */acpigen_emit_word(ctx, gpio->interrupt_debounce_timeout);/* Byte 14-15: Pin Table Offset, relative to start */pin_table_offset = acpi_device_write_zero_len(ctx);/* Byte 16: Reserved */acpigen_emit_byte(ctx, 0);/* Byte 17-18: Resource Source Name Offset, relative to start */resource_offset = acpi_device_write_zero_len(ctx);/* Byte 19-20: Vendor Data Offset, relative to start */vendor_data_offset = acpi_device_write_zero_len(ctx);/* Byte 21-22: Vendor Data Length */acpigen_emit_word(ctx, 0);/* Fill in Pin Table Offset */acpi_device_fill_from_len(ctx, pin_table_offset, start);/* Pin Table, one word for each pin */for (pin = 0; pin < gpio->pin_count; pin++)acpigen_emit_word(ctx, gpio->pins[pin]);/* Fill in Resource Source Name Offset */acpi_device_fill_from_len(ctx, resource_offset, start);/* Resource Source Name String */acpigen_emit_string(ctx, gpio->resource);/* Fill in Vendor Data Offset */acpi_device_fill_from_len(ctx, vendor_data_offset, start);/* Fill in GPIO Descriptor Length (account for len word) */acpi_device_fill_len(ctx, desc_length);return 0;+}
+int acpi_device_write_gpio_desc(struct acpi_ctx *ctx,
const struct gpio_desc *desc)+{
struct acpi_gpio gpio;int ret;ret = gpio_get_acpi(desc, &gpio);if (ret)return log_msg_ret("desc", ret);ret = acpi_device_write_gpio(ctx, &gpio);if (ret)return log_msg_ret("gpio", ret);return 0;+} diff --git a/test/dm/acpigen.c b/test/dm/acpigen.c index fac9886f2e..cc7d51c460 100644 --- a/test/dm/acpigen.c +++ b/test/dm/acpigen.c @@ -12,6 +12,7 @@ #include <malloc.h> #include <acpi/acpigen.h> #include <acpi/acpi_device.h> +#include <asm/gpio.h> #include <asm/unaligned.h> #include <dm/acpi.h> #include <dm/test.h> @@ -140,3 +141,91 @@ static int dm_test_acpi_interrupt(struct unit_test_state *uts) return 0; } DM_TEST(dm_test_acpi_interrupt, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
+/* Test emitting a GPIO descriptor */ +static int dm_test_acpi_gpio(struct unit_test_state *uts) +{
struct gpio_desc desc;struct acpi_ctx *ctx;struct udevice *dev;u8 *ptr;ut_assertok(alloc_context(&ctx));ptr = acpigen_get_current(ctx);ut_assertok(uclass_get_device(UCLASS_TEST_FDT, 0, &dev));ut_asserteq_str("a-test", dev->name);ut_assertok(gpio_request_by_name(dev, "test-gpios", 1, &desc, 0));ut_assertok(acpi_device_write_gpio_desc(ctx, &desc));ut_asserteq(35, acpigen_get_current(ctx) - ptr);ut_asserteq(ACPI_DESCRIPTOR_GPIO, ptr[0]);ut_asserteq(32, get_unaligned((u16 *)(ptr + 1)));ut_asserteq(ACPI_GPIO_REVISION_ID, ptr[3]);ut_asserteq(ACPI_GPIO_TYPE_IO, ptr[4]);ut_asserteq(1, get_unaligned((u16 *)(ptr + 5)));ut_asserteq(9, get_unaligned((u16 *)(ptr + 7)));ut_asserteq(ACPI_GPIO_PULL_UP, ptr[9]);ut_asserteq(1234, get_unaligned((u16 *)(ptr + 10)));ut_asserteq(0, get_unaligned((u16 *)(ptr + 12)));ut_asserteq(23, get_unaligned((u16 *)(ptr + 14)));ut_asserteq(0, ptr[16]);ut_asserteq(25, get_unaligned((u16 *)(ptr + 17)));ut_asserteq(35, get_unaligned((u16 *)(ptr + 19)));ut_asserteq(0, get_unaligned((u16 *)(ptr + 21)));/* pin0 */ut_asserteq(4, get_unaligned((u16 *)(ptr + 23)));ut_asserteq_str("\\_SB.PINC", (char *)ptr + 25);free_context(&ctx);return 0;+} +DM_TEST(dm_test_acpi_gpio, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
+/* Test emitting a GPIO descriptor with an interrupt */ +static int dm_test_acpi_gpio_irq(struct unit_test_state *uts) +{
struct gpio_desc desc;struct acpi_ctx *ctx;struct udevice *dev;u8 *ptr;ut_assertok(alloc_context(&ctx));ptr = acpigen_get_current(ctx);ut_assertok(uclass_get_device(UCLASS_TEST_FDT, 0, &dev));ut_asserteq_str("a-test", dev->name);ut_assertok(gpio_request_by_name(dev, "test2-gpios", 2, &desc, 0));ut_assertok(acpi_device_write_gpio_desc(ctx, &desc));ut_asserteq(35, acpigen_get_current(ctx) - ptr);ut_asserteq(ACPI_DESCRIPTOR_GPIO, ptr[0]);ut_asserteq(32, get_unaligned((u16 *)(ptr + 1)));ut_asserteq(ACPI_GPIO_REVISION_ID, ptr[3]);ut_asserteq(ACPI_GPIO_TYPE_INTERRUPT, ptr[4]);ut_asserteq(1, get_unaligned((u16 *)(ptr + 5)));ut_asserteq(29, get_unaligned((u16 *)(ptr + 7)));ut_asserteq(ACPI_GPIO_PULL_DOWN, ptr[9]);ut_asserteq(0, get_unaligned((u16 *)(ptr + 10)));ut_asserteq(4321, get_unaligned((u16 *)(ptr + 12)));ut_asserteq(23, get_unaligned((u16 *)(ptr + 14)));ut_asserteq(0, ptr[16]);ut_asserteq(25, get_unaligned((u16 *)(ptr + 17)));ut_asserteq(35, get_unaligned((u16 *)(ptr + 19)));ut_asserteq(0, get_unaligned((u16 *)(ptr + 21)));/* pin0 */ut_asserteq(6, get_unaligned((u16 *)(ptr + 23)));ut_asserteq_str("\\_SB.PINC", (char *)ptr + 25);free_context(&ctx);return 0;+}
+DM_TEST(dm_test_acpi_gpio_irq, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
2.27.0.290.gba653c62da-goog