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| author | Furquan Shaikh <furquan@chromium.org> | 2016-12-01 07:12:32 -0800 |
|---|---|---|
| committer | Furquan Shaikh <furquan@google.com> | 2016-12-05 03:29:04 +0100 |
| commit | 94f8699d447ef94df339d318b836b664273e89ff (patch) | |
| tree | 17223ccd5906a8087251beabc943786cade37ee4 /src/include | |
| parent | 36b81af9e8ecea2bf58aae9a421720ed10f61b82 (diff) | |
| download | coreboot-94f8699d447ef94df339d318b836b664273e89ff.tar.xz | |
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 <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/17684
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Diffstat (limited to 'src/include')
| -rw-r--r-- | src/include/spi-generic.h | 18 |
1 files changed, 18 insertions, 0 deletions
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); }; /*----------------------------------------------------------------------- |