diff options
| author | Simon Glass <sjg@chromium.org> | 2015-02-17 15:29:37 -0700 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2015-05-05 20:58:19 -0600 |
| commit | 527265d8f25196b3d0cc042846f901858723f26c (patch) | |
| tree | d74f8958907b3e8d715bd23f182bb82b0b577a11 /drivers/misc | |
| parent | c4b206dff14eba50d4d6d06dca71205d08629662 (diff) | |
| download | u-boot-imx-527265d8f25196b3d0cc042846f901858723f26c.zip u-boot-imx-527265d8f25196b3d0cc042846f901858723f26c.tar.gz u-boot-imx-527265d8f25196b3d0cc042846f901858723f26c.tar.bz2 | |
cros_ec: Handle the single duplex requirement in cros_ec
With several chips using the SPI protocol it seems better to put the single
duplex functionality in the EC rather than the SPI driver.
Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/cros_ec_spi.c | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/drivers/misc/cros_ec_spi.c b/drivers/misc/cros_ec_spi.c index ac2ee86..0686925 100644 --- a/drivers/misc/cros_ec_spi.c +++ b/drivers/misc/cros_ec_spi.c @@ -25,6 +25,8 @@ int cros_ec_spi_packet(struct udevice *udev, int out_bytes, int in_bytes) { struct cros_ec_dev *dev = dev_get_uclass_priv(udev); struct spi_slave *slave = dev_get_parentdata(dev->dev); + ulong start; + uint8_t byte; int rv; /* Do the transfer */ @@ -33,10 +35,25 @@ int cros_ec_spi_packet(struct udevice *udev, int out_bytes, int in_bytes) return -1; } - rv = spi_xfer(slave, max(out_bytes, in_bytes) * 8, - dev->dout, dev->din, - SPI_XFER_BEGIN | SPI_XFER_END); + rv = spi_xfer(slave, out_bytes * 8, dev->dout, NULL, SPI_XFER_BEGIN); + if (rv) + goto done; + start = get_timer(0); + while (1) { + rv = spi_xfer(slave, 8, NULL, &byte, 0); + if (byte == SPI_PREAMBLE_END_BYTE) + break; + if (rv) + goto done; + if (get_timer(start) > 100) { + rv = -ETIMEDOUT; + goto done; + } + } + rv = spi_xfer(slave, in_bytes * 8, NULL, dev->din, 0); +done: + spi_xfer(slave, 0, NULL, NULL, SPI_XFER_END); spi_release_bus(slave); if (rv) { |