diff options
Diffstat (limited to 'src/arch')
| -rw-r--r-- | src/arch/x86/acpi_device.c | 46 | ||||
| -rw-r--r-- | src/arch/x86/include/arch/acpi_device.h | 9 |
2 files changed, 55 insertions, 0 deletions
diff --git a/src/arch/x86/acpi_device.c b/src/arch/x86/acpi_device.c index 7cf292fbee..4fe16a138f 100644 --- a/src/arch/x86/acpi_device.c +++ b/src/arch/x86/acpi_device.c @@ -490,6 +490,52 @@ void acpi_device_write_spi(const struct acpi_spi *spi) acpi_device_fill_len(desc_length); } +/* PowerResource() with Enable and/or Reset control */ +void acpi_device_add_power_res( + struct acpi_gpio *reset, unsigned reset_delay_ms, + struct acpi_gpio *enable, unsigned enable_delay_ms) +{ + const char *power_res_dev_states[] = { "_PR0", "_PR3" }; + unsigned reset_gpio = reset->pins[0]; + unsigned enable_gpio = enable->pins[0]; + + if (!reset_gpio && !enable_gpio) + return; + + /* PowerResource (PRIC, 0, 0) */ + acpigen_write_power_res("PRIC", 0, 0, power_res_dev_states, + ARRAY_SIZE(power_res_dev_states)); + + /* Method (_STA, 0, NotSerialized) { Return (0x1) } */ + acpigen_write_STA(0x1); + + /* Method (_ON, 0, Serialized) */ + acpigen_write_method_serialized("_ON", 0); + if (reset_gpio) + acpigen_soc_set_tx_gpio(reset_gpio); + if (enable_gpio) { + acpigen_soc_set_tx_gpio(enable_gpio); + if (enable_delay_ms) + acpigen_write_sleep(enable_delay_ms); + } + if (reset_gpio) { + acpigen_soc_clear_tx_gpio(reset_gpio); + if (reset_delay_ms) + acpigen_write_sleep(reset_delay_ms); + } + acpigen_pop_len(); /* _ON method */ + + /* Method (_OFF, 0, Serialized) */ + acpigen_write_method_serialized("_OFF", 0); + if (reset_gpio) + acpigen_soc_set_tx_gpio(reset_gpio); + if (enable_gpio) + acpigen_soc_clear_tx_gpio(enable_gpio); + acpigen_pop_len(); /* _OFF method */ + + acpigen_pop_len(); /* PowerResource PRIC */ +} + static void acpi_dp_write_array(const struct acpi_dp *array); static void acpi_dp_write_value(const struct acpi_dp *prop) { diff --git a/src/arch/x86/include/arch/acpi_device.h b/src/arch/x86/include/arch/acpi_device.h index aba5c2d1a6..7d4cb8fd89 100644 --- a/src/arch/x86/include/arch/acpi_device.h +++ b/src/arch/x86/include/arch/acpi_device.h @@ -240,6 +240,15 @@ struct acpi_spi { void acpi_device_write_spi(const struct acpi_spi *spi); /* + * Add a basic PowerResource block for a device that includes + * GPIOs for enable and/or reset control of the device. Each + * GPIO is optional, but at least one must be provided. + */ +void acpi_device_add_power_res( + struct acpi_gpio *reset, unsigned reset_delay_ms, + struct acpi_gpio *enable, unsigned enable_delay_ms); + +/* * Writing Device Properties objects via _DSD * * http://uefi.org/sites/default/files/resources/_DSD-device-properties-UUID.pdf |