diff options
| author | Anton Vorontsov <avorontsov@ru.mvista.com> | 2007-07-31 00:38:41 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-31 15:39:39 -0700 |
| commit | 32421daaf8236b0fd6e032f6b1dd8086ccae2a46 (patch) | |
| tree | 15eb846fc3b328915c3d2c95354e295ab7b09a3a /drivers/spi | |
| parent | 20ba09b979f7e1de790968a9175c6caceda00261 (diff) | |
| download | linux-32421daaf8236b0fd6e032f6b1dd8086ccae2a46.tar.bz2 | |
spi_mpc83xx: support for lsb-first transfers
This controller supports LSB-first transfers; let drivers use them.
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Acked-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi_mpc83xx.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/drivers/spi/spi_mpc83xx.c b/drivers/spi/spi_mpc83xx.c index e2d8dbc15c80..18c475dd5709 100644 --- a/drivers/spi/spi_mpc83xx.c +++ b/drivers/spi/spi_mpc83xx.c @@ -153,13 +153,16 @@ static void mpc83xx_spi_chipselect(struct spi_device *spi, int value) len = len - 1; /* mask out bits we are going to set */ - regval &= ~(SPMODE_CP_BEGIN_EDGECLK | SPMODE_CI_INACTIVEHIGH | - SPMODE_LEN(0xF) | SPMODE_DIV16 | SPMODE_PM(0xF)); + regval &= ~(SPMODE_CP_BEGIN_EDGECLK | SPMODE_CI_INACTIVEHIGH + | SPMODE_LEN(0xF) | SPMODE_DIV16 + | SPMODE_PM(0xF) | SPMODE_REV); if (spi->mode & SPI_CPHA) regval |= SPMODE_CP_BEGIN_EDGECLK; if (spi->mode & SPI_CPOL) regval |= SPMODE_CI_INACTIVEHIGH; + if (!(spi->mode & SPI_LSB_FIRST)) + regval |= SPMODE_REV; regval |= SPMODE_LEN(len); @@ -248,9 +251,11 @@ int mpc83xx_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t) regval = mpc83xx_spi_read_reg(&mpc83xx_spi->base->mode); - /* Mask out bits_per_wordgth */ - regval &= ~SPMODE_LEN(0xF); + /* mask out bits we are going to set */ + regval &= ~(SPMODE_LEN(0xF) | SPMODE_REV); regval |= SPMODE_LEN(bits_per_word); + if (!(spi->mode & SPI_LSB_FIRST)) + regval |= SPMODE_REV; /* Turn off SPI unit prior changing mode */ mpc83xx_spi_write_reg(&mpc83xx_spi->base->mode, 0); @@ -260,7 +265,7 @@ int mpc83xx_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t) } /* the spi->mode bits understood by this driver: */ -#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH) +#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST) static int mpc83xx_spi_setup(struct spi_device *spi) { |