diff options
Diffstat (limited to 'src/arch/x86/acpi_device.c')
| -rw-r--r-- | src/arch/x86/acpi_device.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/src/arch/x86/acpi_device.c b/src/arch/x86/acpi_device.c index b607834349..610b922b34 100644 --- a/src/arch/x86/acpi_device.c +++ b/src/arch/x86/acpi_device.c @@ -19,6 +19,9 @@ #include <arch/acpigen.h> #include <device/device.h> #include <device/path.h> +#if IS_ENABLED(CONFIG_GENERIC_GPIO_LIB) +#include <gpio.h> +#endif /* Write empty word value and return pointer to it */ static void *acpi_device_write_zero_len(void) @@ -184,3 +187,139 @@ void acpi_device_write_interrupt(const struct acpi_irq *irq) /* Fill in Descriptor Length (account for len word) */ acpi_device_fill_len(desc_length); } + +/* ACPI 6.1 section 6.4.3.8.1 - GPIO Interrupt or I/O */ +void acpi_device_write_gpio(const struct acpi_gpio *gpio) +{ + void *start, *desc_length; + void *pin_table_offset, *vendor_data_offset, *resource_offset; + uint16_t flags = 0; + int pin; + + if (!gpio || gpio->type > ACPI_GPIO_TYPE_IO) + return; + + start = acpigen_get_current(); + + /* Byte 0: Descriptor Type */ + acpigen_emit_byte(ACPI_DESCRIPTOR_GPIO); + + /* Byte 1-2: Length (fill in later) */ + desc_length = acpi_device_write_zero_len(); + + /* Byte 3: Revision ID */ + acpigen_emit_byte(ACPI_GPIO_REVISION_ID); + + /* Byte 4: GpioIo or GpioInt */ + acpigen_emit_byte(gpio->type); + + /* + * Byte 5-6: General Flags + * [15:1]: 0 => Reserved + * [0]: 1 => ResourceConsumer + */ + acpigen_emit_word(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 == IRQ_EDGE_TRIGGERED) + flags |= 1 << 0; + if (gpio->irq.shared == IRQ_SHARED) + flags |= 1 << 3; + if (gpio->irq.wake == IRQ_WAKE) + flags |= 1 << 4; + + switch (gpio->irq.polarity) { + case IRQ_ACTIVE_HIGH: + flags |= 0 << 1; + break; + case IRQ_ACTIVE_LOW: + flags |= 1 << 1; + break; + case 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(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(gpio->pull); + + /* Byte 10-11: Output Drive Strength in 1/100 mA */ + acpigen_emit_word(gpio->output_drive_strength); + + /* Byte 12-13: Debounce Timeout in 1/100 ms */ + acpigen_emit_word(gpio->interrupt_debounce_timeout); + + /* Byte 14-15: Pin Table Offset, relative to start */ + pin_table_offset = acpi_device_write_zero_len(); + + /* Byte 16: Reserved */ + acpigen_emit_byte(0); + + /* Byte 17-18: Resource Source Name Offset, relative to start */ + resource_offset = acpi_device_write_zero_len(); + + /* Byte 19-20: Vendor Data Offset, relative to start */ + vendor_data_offset = acpi_device_write_zero_len(); + + /* Byte 21-22: Vendor Data Length */ + acpigen_emit_word(0); + + /* Fill in Pin Table Offset */ + acpi_device_fill_from_len(pin_table_offset, start); + + /* Pin Table, one word for each pin */ + for (pin = 0; pin < gpio->pin_count; pin++) + acpigen_emit_word(gpio->pins[pin]); + + /* Fill in Resource Source Name Offset */ + acpi_device_fill_from_len(resource_offset, start); + + /* Resource Source Name String */ +#if IS_ENABLED(CONFIG_GENERIC_GPIO_LIB) + acpigen_emit_string(gpio->resource ? : gpio_acpi_path(gpio->pins[0])); +#else + acpigen_emit_string(gpio->resource); +#endif + + /* Fill in Vendor Data Offset */ + acpi_device_fill_from_len(vendor_data_offset, start); + + /* Fill in GPIO Descriptor Length (account for len word) */ + acpi_device_fill_len(desc_length); +} |