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>
diff --git a/src/include/spi-generic.h b/src/include/spi-generic.h
index c8b209d..b4a10af 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);
};
/*-----------------------------------------------------------------------