diff options
Diffstat (limited to 'src/arch/x86/include')
| -rw-r--r-- | src/arch/x86/include/arch/acpi_device.h | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/src/arch/x86/include/arch/acpi_device.h b/src/arch/x86/include/arch/acpi_device.h index 7b5001f65a..dc7f26c14b 100644 --- a/src/arch/x86/include/arch/acpi_device.h +++ b/src/arch/x86/include/arch/acpi_device.h @@ -164,6 +164,7 @@ void acpi_device_write_gpio(const struct acpi_gpio *gpio); */ #define ACPI_SERIAL_BUS_TYPE_I2C 1 +#define ACPI_SERIAL_BUS_TYPE_SPI 2 #define ACPI_SERIAL_BUS_REVISION_ID 1 /* @@ -184,4 +185,47 @@ struct acpi_i2c { /* Write I2cSerialBus() descriptor to SSDT AML output */ void acpi_device_write_i2c(const struct acpi_i2c *i2c); +/* + * ACPI SPI Bus + */ + +enum spi_clock_phase { + SPI_CLOCK_PHASE_FIRST, + SPI_CLOCK_PHASE_SECOND +}; + +/* SPI Flags bit 0 */ +enum spi_wire_mode { + SPI_4_WIRE_MODE, + SPI_3_WIRE_MODE +}; + +/* SPI Flags bit 1 */ +enum spi_polarity { + SPI_POLARITY_LOW, + SPI_POLARITY_HIGH +}; + +struct acpi_spi { + /* Device selection */ + uint16_t device_select; + /* Device selection line is active high or low */ + enum spi_polarity device_select_polarity; + /* 3 or 4 wire SPI connection */ + enum spi_wire_mode wire_mode; + /* Connection speed in HZ */ + unsigned int speed; + /* Size in bits of smallest transfer unit */ + u8 data_bit_length; + /* Phase of clock pulse on which to capture data */ + enum spi_clock_phase clock_phase; + /* Indicate if clock is high or low during first phase */ + enum spi_polarity clock_polarity; + /* Reference to SPI controller */ + const char *resource; +}; + +/* Write SPI Bus descriptor to SSDT AML output */ +void acpi_device_write_spi(const struct acpi_spi *spi); + #endif |