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authorAaron Durbin <adurbin@chromium.org>2018-04-19 21:15:25 -0600
committerAaron Durbin <adurbin@chromium.org>2018-04-23 20:58:58 +0000
commit851dde8255efda7ecf9b37a3b7b22f4edab8881f (patch)
tree10a4d241f9af25db1fb9c71b696dfecb7ca5cf44 /src/include
parent6c2b10e98933569f028d2ee78efb4cc660d2f9ac (diff)
drivers/spi: reduce confusion in the API
Julius brought up confusion about the current spi api in [1]. In order alleviate the confusion stemming from supporting x86 spi flash controllers: - Remove spi_xfer_two_vectors() which was fusing transactions to accomodate the limitations of the spi controllers themselves. - Add spi_flash_vector_helper() for the x86 spi flash controllers to utilize in validating driver/controller current assumptions. - Remove the xfer() callback in the x86 spi flash drivers which will trigger an error as these controllers can't support the api. [1] https://mail.coreboot.org/pipermail/coreboot/2018-April/086561.html Change-Id: Id88adc6ad5234c29a739d43521c5f344bb7d3217 Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: https://review.coreboot.org/25745 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Julius Werner <jwerner@chromium.org>
Diffstat (limited to 'src/include')
-rw-r--r--src/include/spi-generic.h28
-rw-r--r--src/include/spi_flash.h14
2 files changed, 22 insertions, 20 deletions
diff --git a/src/include/spi-generic.h b/src/include/spi-generic.h
index 20c7cc72c7..e3e7f829f7 100644
--- a/src/include/spi-generic.h
+++ b/src/include/spi-generic.h
@@ -109,7 +109,10 @@ enum {
};
/*-----------------------------------------------------------------------
- * Representation of a SPI controller.
+ * Representation of a SPI controller. Note the xfer() and xfer_vector()
+ * callbacks are meant to process full duplex transactions. If the
+ * controller cannot handle these transactions then return an error when
+ * din and dout are both set. See spi_xfer() below for more details.
*
* claim_bus: Claim SPI bus and prepare for communication.
* release_bus: Release SPI bus.
@@ -232,6 +235,10 @@ void spi_release_bus(const struct spi_slave *slave);
* din: Pointer to a string of bytes that will be filled in.
* bytesin: How many bytes to read.
*
+ * Note that din and dout are transferred simulataneously in a full duplex
+ * transaction. The number of clocks within one transaction is calculated
+ * as: MAX(bytesout*8, bytesin*8).
+ *
* Returns: 0 on success, not 0 on failure
*/
int spi_xfer(const struct spi_slave *slave, const void *dout, size_t bytesout,
@@ -281,23 +288,4 @@ static inline int spi_w8r8(const struct spi_slave *slave, unsigned char byte)
return ret < 0 ? ret : din[1];
}
-/*
- * Helper function to allow chipsets to combine two vectors if possible. It can
- * only handle upto 2 vectors.
- *
- * This function is provided to support command-response kind of transactions
- * expected by users like flash. Some special SPI flash controllers can handle
- * such command-response operations in a single transaction. For these special
- * controllers, separate command and response vectors can be combined into a
- * single operation.
- *
- * Two vectors are combined if first vector has a non-NULL dout and NULL din and
- * second vector has a non-NULL din and NULL dout. Otherwise, each vector is
- * operated upon one at a time.
- *
- * Returns 0 on success and non-zero on failure.
- */
-int spi_xfer_two_vectors(const struct spi_slave *slave,
- struct spi_op vectors[], size_t count);
-
#endif /* _SPI_GENERIC_H_ */
diff --git a/src/include/spi_flash.h b/src/include/spi_flash.h
index 3a6df9ab1f..f7f3b3dbdf 100644
--- a/src/include/spi_flash.h
+++ b/src/include/spi_flash.h
@@ -125,4 +125,18 @@ const struct spi_flash *boot_device_spi_flash(void);
int spi_flash_ctrlr_protect_region(const struct spi_flash *flash,
const struct region *region);
+/*
+ * This function is provided to support spi flash command-response transactions.
+ * Only 2 vectors are supported and the 'func' is called with appropriate
+ * write and read buffers together. This can be used for chipsets that
+ * have specific spi flash controllers that don't conform to the normal
+ * spi xfer API because they are specialized controllers and not generic.
+ *
+ * Returns 0 on success and non-zero on failure.
+ */
+int spi_flash_vector_helper(const struct spi_slave *slave,
+ struct spi_op vectors[], size_t count,
+ int (*func)(const struct spi_slave *slave, const void *dout,
+ size_t bytesout, void *din, size_t bytesin));
+
#endif /* _SPI_FLASH_H_ */