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spi: Add function callback to get configuration of SPI bus

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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 <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/18337
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
This commit is contained in:
Furquan Shaikh
2017-01-08 13:32:30 -08:00
committed by Furquan Shaikh
parent c76e9982b2
commit 3e01b633d6
3 changed files with 53 additions and 17 deletions
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42
src/include/spi-generic.h
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@ -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.
*