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authorFurquan Shaikh <furquan@chromium.org>2016-12-01 07:12:32 -0800
committerFurquan Shaikh <furquan@google.com>2016-12-05 03:29:04 +0100
commit94f8699d447ef94df339d318b836b664273e89ff (patch)
tree17223ccd5906a8087251beabc943786cade37ee4 /src/include
parent36b81af9e8ecea2bf58aae9a421720ed10f61b82 (diff)
downloadcoreboot-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.h18
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);
};
/*-----------------------------------------------------------------------