diff options
| author | Anton Vorontsov <avorontsov@ru.mvista.com> | 2007-07-31 09:38:45 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-08-01 00:39:40 +0200 |
| commit | 2a485d7ad2b68600e423f8799efc0d074029ec01 (patch) | |
| tree | 147689d4fe83eddc14d953140bdbbea792860d70 /drivers/spi | |
| parent | spidev_test utility (diff) | |
| download | linux-2a485d7ad2b68600e423f8799efc0d074029ec01.tar.xz linux-2a485d7ad2b68600e423f8799efc0d074029ec01.zip | |
spi_mpc83xx: support loopback mode
This exposes the hardware loopback mode to drivers, primarily for testing.
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
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 | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/spi/spi_mpc83xx.c b/drivers/spi/spi_mpc83xx.c index 72812bb9b40f..0c16a2b39b41 100644 --- a/drivers/spi/spi_mpc83xx.c +++ b/drivers/spi/spi_mpc83xx.c @@ -39,6 +39,7 @@ struct mpc83xx_spi_reg { }; /* SPI Controller mode register definitions */ +#define SPMODE_LOOP (1 << 30) #define SPMODE_CI_INACTIVEHIGH (1 << 29) #define SPMODE_CP_BEGIN_EDGECLK (1 << 28) #define SPMODE_DIV16 (1 << 27) @@ -155,7 +156,7 @@ static void mpc83xx_spi_chipselect(struct spi_device *spi, int value) /* mask out bits we are going to set */ regval &= ~(SPMODE_CP_BEGIN_EDGECLK | SPMODE_CI_INACTIVEHIGH | SPMODE_LEN(0xF) | SPMODE_DIV16 - | SPMODE_PM(0xF) | SPMODE_REV); + | SPMODE_PM(0xF) | SPMODE_REV | SPMODE_LOOP); if (spi->mode & SPI_CPHA) regval |= SPMODE_CP_BEGIN_EDGECLK; @@ -163,6 +164,8 @@ static void mpc83xx_spi_chipselect(struct spi_device *spi, int value) regval |= SPMODE_CI_INACTIVEHIGH; if (!(spi->mode & SPI_LSB_FIRST)) regval |= SPMODE_REV; + if (spi->mode & SPI_LOOP) + regval |= SPMODE_LOOP; regval |= SPMODE_LEN(len); @@ -273,7 +276,8 @@ 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 | SPI_LSB_FIRST) +#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH \ + | SPI_LSB_FIRST | SPI_LOOP) static int mpc83xx_spi_setup(struct spi_device *spi) { |