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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/drivers/spi
parent6c2b10e98933569f028d2ee78efb4cc660d2f9ac (diff)
downloadcoreboot-851dde8255efda7ecf9b37a3b7b22f4edab8881f.tar.xz
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/drivers/spi')
-rw-r--r--src/drivers/spi/spi-generic.c53
-rw-r--r--src/drivers/spi/spi_flash.c48
2 files changed, 48 insertions, 53 deletions
diff --git a/src/drivers/spi/spi-generic.c b/src/drivers/spi/spi-generic.c
index 1fcc05d4f3..6d7fcdc021 100644
--- a/src/drivers/spi/spi-generic.c
+++ b/src/drivers/spi/spi-generic.c
@@ -146,56 +146,3 @@ int spi_setup_slave(unsigned int bus, unsigned int cs, struct spi_slave *slave)
return 0;
}
-
-static int spi_xfer_combine_two_vectors(const struct spi_slave *slave,
- struct spi_op *v1, struct spi_op *v2)
-{
- struct spi_op op = {
- .dout = v1->dout, .bytesout = v1->bytesout,
- .din = v2->din, .bytesin = v2->bytesin,
- };
- int ret;
-
- /*
- * Combine two vectors only if:
- * v1 has non-NULL dout and NULL din and
- * v2 has non-NULL din and NULL dout and
- *
- * In all other cases, do not combine the two vectors.
- */
- if ((!v1->dout || v1->din) || (v2->dout || !v2->din))
- return -1;
-
- ret = spi_xfer_single_op(slave, &op);
- v1->status = v2->status = op.status;
-
- return ret;
-}
-
-/*
- * Helper function to allow chipsets to combine two vectors if possible. This
- * function can only handle upto 2 vectors.
- *
- * 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)
-{
- int ret;
-
- assert (count <= 2);
-
- if (count == 2) {
- ret = spi_xfer_combine_two_vectors(slave, &vectors[0],
- &vectors[1]);
-
- if (!ret || (vectors[0].status != SPI_OP_NOT_EXECUTED))
- return ret;
- }
-
- return spi_xfer_vector_default(slave, vectors, count);
-}
diff --git a/src/drivers/spi/spi_flash.c b/src/drivers/spi/spi_flash.c
index f0f119addb..9cb10855fa 100644
--- a/src/drivers/spi/spi_flash.c
+++ b/src/drivers/spi/spi_flash.c
@@ -519,3 +519,51 @@ int spi_flash_ctrlr_protect_region(const struct spi_flash *flash,
return -1;
}
+
+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))
+{
+ int ret;
+ void *din;
+ size_t bytes_in;
+
+ if (count < 1 || count > 2)
+ return -1;
+
+ /* SPI flash commands always have a command first... */
+ if (!vectors[0].dout || !vectors[0].bytesout)
+ return -1;
+ /* And not read any data during the command. */
+ if (vectors[0].din || vectors[0].bytesin)
+ return -1;
+
+ if (count == 2) {
+ /* If response bytes requested ensure the buffer is valid. */
+ if (vectors[1].bytesin && !vectors[1].din)
+ return -1;
+ /* No sends can accompany a receive. */
+ if (vectors[1].dout || vectors[1].bytesout)
+ return -1;
+ din = vectors[1].din;
+ bytes_in = vectors[1].bytesin;
+ } else {
+ din = NULL;
+ bytes_in = 0;
+ }
+
+ ret = func(slave, vectors[0].dout, vectors[0].bytesout, din, bytes_in);
+
+ if (ret) {
+ vectors[0].status = SPI_OP_FAILURE;
+ if (count == 2)
+ vectors[1].status = SPI_OP_FAILURE;
+ } else {
+ vectors[0].status = SPI_OP_SUCCESS;
+ if (count == 2)
+ vectors[1].status = SPI_OP_SUCCESS;
+ }
+
+ return ret;
+}