diff options
author | Aaron Durbin <adurbin@chromium.org> | 2014-08-06 14:34:57 -0500 |
---|---|---|
committer | Patrick Georgi <pgeorgi@google.com> | 2015-03-21 10:43:26 +0100 |
commit | 828272767d067cc215ff6c7dc93bd731a1a61765 (patch) | |
tree | a7b7b8078be296b2522d0f8b36ca78dfd43c64da /src/ec/google/chromeec/ec_spi.c | |
parent | 3e49738baa84958e8f62211e676ad326682bc0bb (diff) |
chromeec: allow transport implementation to provide buffers for proto v3
Depending on the transport mechanism for proto v3 different bytes
need to be send and/or read before the request and response. Depending
on the software and/or controller interface that requirement leads to
needing to copy data into temporary buffers. Avoid this by allowing
the transport mechanism to provide the request and response
buffers.
BUG=chrome-os-partner:31148
BRANCH=None
TEST=Built for rush and ryu. Ran on ryu with i2c implementation.
Also built for rambi to check x86 systems.
Change-Id: I35d4d69bd1fa900fc0cfe3822496f381405bdcb1
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: c7224426e1d0bcf06ed010131a2462a6ca201d8b
Original-Change-Id: Iad6cce566a253ca72e6f5009a97235ece0a6c1b5
Original-Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/211138
Original-Reviewed-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: http://review.coreboot.org/8827
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src/ec/google/chromeec/ec_spi.c')
-rw-r--r-- | src/ec/google/chromeec/ec_spi.c | 27 |
1 files changed, 22 insertions, 5 deletions
diff --git a/src/ec/google/chromeec/ec_spi.c b/src/ec/google/chromeec/ec_spi.c index f1bdd3caaa..6107836153 100644 --- a/src/ec/google/chromeec/ec_spi.c +++ b/src/ec/google/chromeec/ec_spi.c @@ -25,15 +25,32 @@ static const uint8_t EcFramingByte = 0xec; -static int crosec_spi_io(uint8_t *write_bytes, size_t write_size, - uint8_t *read_bytes, size_t read_size, - void *context) +#define PROTO3_MAX_PACKET_SIZE 268 + +static uint8_t req_buf[PROTO3_MAX_PACKET_SIZE]; +static uint8_t resp_buf[PROTO3_MAX_PACKET_SIZE]; + +void *crosec_get_buffer(size_t size, int req) +{ + if (size > PROTO3_MAX_PACKET_SIZE) { + printk(BIOS_DEBUG, "Proto v3 buffer request too large: %zu!\n", + size); + return NULL; + } + + if (req) + return req_buf; + else + return resp_buf; +} + +static int crosec_spi_io(size_t req_size, size_t resp_size, void *context) { struct spi_slave *slave = (struct spi_slave *)context; spi_claim_bus(slave); - if (spi_xfer(slave, write_bytes, write_size, NULL, 0)) { + if (spi_xfer(slave, req_buf, req_size, NULL, 0)) { printk(BIOS_ERR, "%s: Failed to send request.\n", __func__); spi_release_bus(slave); return -1; @@ -64,7 +81,7 @@ static int crosec_spi_io(uint8_t *write_bytes, size_t write_size, } } - if (spi_xfer(slave, NULL, 0, read_bytes, read_size)) { + if (spi_xfer(slave, NULL, 0, resp_buf, resp_size)) { printk(BIOS_ERR, "%s: Failed to receive response.\n", __func__); spi_release_bus(slave); return -1; |