From 2a485d7ad2b68600e423f8799efc0d074029ec01 Mon Sep 17 00:00:00 2001 From: Anton Vorontsov Date: Tue, 31 Jul 2007 00:38:45 -0700 Subject: [PATCH] spi_mpc83xx: support loopback mode This exposes the hardware loopback mode to drivers, primarily for testing. Signed-off-by: Anton Vorontsov Signed-off-by: David Brownell Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/spi/spi_mpc83xx.c | 8 ++++++-- 1 file 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) {