Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=2a485d7ad2b68600e423f8799efc0d074029ec01
Commit: 2a485d7ad2b68600e423f8799efc0d074029ec01
Parent: 22b238bdb93ed2fcb1d627ce81d8a2fcbe24de85
Author: Anton Vorontsov <[EMAIL PROTECTED]>
AuthorDate: Tue Jul 31 00:38:45 2007 -0700
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Tue Jul 31 15:39:40 2007 -0700
spi_mpc83xx: support loopback mode
This exposes the hardware loopback mode to drivers, primarily for testing.
Signed-off-by: Anton Vorontsov <[EMAIL PROTECTED]>
Signed-off-by: David Brownell <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
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 72812bb..0c16a2b 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)
{
-
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