From 3e01b633d6e18ae72e71e198671890d6accbda25 Mon Sep 17 00:00:00 2001 From: Furquan Shaikh Date: Sun, 8 Jan 2017 13:32:30 -0800 Subject: spi: Add function callback to get configuration of SPI bus Add a new callback to spi_ctrlr structure - get_config - to obtain configuration of SPI bus from the controller driver. Also, move common config definitions from acpi_device.h to spi-generic.h BUG=chrome-os-partner:59832 BRANCH=None TEST=Compiles successfully Change-Id: I412c8c70167d18058a32041c2310bc1c884043ce Signed-off-by: Furquan Shaikh Reviewed-on: https://review.coreboot.org/18337 Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel Reviewed-by: Duncan Laurie --- src/include/spi-generic.h | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) (limited to 'src/include/spi-generic.h') diff --git a/src/include/spi-generic.h b/src/include/spi-generic.h index 7eb18a6ac8..cc3d3cf1b9 100644 --- a/src/include/spi-generic.h +++ b/src/include/spi-generic.h @@ -59,9 +59,38 @@ struct spi_op { enum spi_op_status status; }; +enum spi_clock_phase { + SPI_CLOCK_PHASE_FIRST, + SPI_CLOCK_PHASE_SECOND +}; + +enum spi_wire_mode { + SPI_4_WIRE_MODE, + SPI_3_WIRE_MODE +}; + +enum spi_polarity { + SPI_POLARITY_LOW, + SPI_POLARITY_HIGH +}; + +struct spi_cfg { + /* CLK phase - 0: Phase first, 1: Phase second */ + enum spi_clock_phase clk_phase; + /* CLK polarity - 0: Low, 1: High */ + enum spi_polarity clk_polarity; + /* CS polarity - 0: Low, 1: High */ + enum spi_polarity cs_polarity; + /* Wire mode - 0: 4-wire, 1: 3-wire */ + enum spi_wire_mode wire_mode; + /* Data bit length. */ + unsigned int data_bit_length; +}; + /*----------------------------------------------------------------------- * Representation of a SPI contoller. * + * get_config: Get configuration of SPI bus * claim_bus: Claim SPI bus and prepare for communication. * release_bus: Release SPI bus. * setup: Setup given SPI device bus. @@ -69,6 +98,8 @@ struct spi_op { * xfer_vector: Vector of SPI transfer operations. */ struct spi_ctrlr { + int (*get_config)(const struct spi_slave *slave, + struct spi_cfg *cfg); int (*claim_bus)(const struct spi_slave *slave); void (*release_bus)(const struct spi_slave *slave); int (*setup)(const struct spi_slave *slave); @@ -101,6 +132,17 @@ extern const size_t spi_ctrlr_bus_map_count; */ void spi_init(void); +/* + * Get configuration of SPI bus. + * + * slave: Pointer to slave structure. + * cfg: Pointer to SPI configuration that needs to be filled. + * + * Returns: + * 0 on success, -1 on error + */ +int spi_get_config(const struct spi_slave *slave, struct spi_cfg *cfg); + /*----------------------------------------------------------------------- * Set up communications parameters for a SPI slave. * -- cgit v1.2.3