From 94f8699d447ef94df339d318b836b664273e89ff Mon Sep 17 00:00:00 2001 From: Furquan Shaikh Date: Thu, 1 Dec 2016 07:12:32 -0800 Subject: spi: Define and use spi_ctrlr structure 1. Define a new structure spi_ctrlr that allows platforms to define callbacks for spi operations (claim bus, release bus, transfer). 2. Add a new member (pointer to spi_ctrlr structure) in spi_slave structure which will be initialized by call to spi_setup_slave. 3. Define spi_claim_bus, spi_release_bus and spi_xfer in spi-generic.c which will make appropriate calls to ctrlr functions. BUG=chrome-os-partner:59832 BRANCH=None TEST=Compiles successfully Change-Id: Icb2326e3aab1e8f4bef53f553f82b3836358c55e Signed-off-by: Furquan Shaikh Reviewed-on: https://review.coreboot.org/17684 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin --- src/include/spi-generic.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'src/include') diff --git a/src/include/spi-generic.h b/src/include/spi-generic.h index c8b209da21..b4a10af0c0 100644 --- a/src/include/spi-generic.h +++ b/src/include/spi-generic.h @@ -21,15 +21,33 @@ /* Controller-specific definitions: */ +struct spi_ctrlr; + /*----------------------------------------------------------------------- * Representation of a SPI slave, i.e. what we're communicating with. * * bus: ID of the bus that the slave is attached to. * cs: ID of the chip select connected to the slave. + * ctrlr: Pointer to SPI controller structure. */ struct spi_slave { unsigned int bus; unsigned int cs; + const struct spi_ctrlr *ctrlr; +}; + +/*----------------------------------------------------------------------- + * Representation of a SPI contoller. + * + * claim_bus: Claim SPI bus and prepare for communication. + * release_bus: Release SPI bus. + * xfer: SPI transfer + */ +struct spi_ctrlr { + int (*claim_bus)(const struct spi_slave *slave); + void (*release_bus)(const struct spi_slave *slave); + int (*xfer)(const struct spi_slave *slave, const void *dout, + size_t bytesout, void *din, size_t bytesin); }; /*----------------------------------------------------------------------- -- cgit v1.2.3