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spi: Define and use spi_ctrlr structure

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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>
This commit is contained in:
Furquan Shaikh
2016-12-01 07:12:32 -08:00
committed by Furquan Shaikh
parent 36b81af9e8
commit 94f8699d44
26 changed files with 521 additions and 494 deletions
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18
src/include/spi-generic.h
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@ -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);
};
/*-----------------------------------------------------------------------