OpenE2K
/
linux
6
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

spi: a3700: Allow to enable or disable FIFO mode 

The armada 3700 SPI controller allows to make transfers without using
the 32 bytes RFIFO and WFIFO.

This commit enable switching between FIFO and non-FIFO mode, which is
necessary to implement full-duplex transfers.

Signed-off-by: Maxime Chevallier <maxime.chevallier@smile.fr>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Maxime Chevallier 2018-01-17 17:15:27 +01:00 committed by Mark Brown
parent abf3a49e50
commit a456c9320d
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 6 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/spi/spi-armada-3700.c
View File

@ -185,12 +185,15 @@ static int a3700_spi_pin_mode_set(struct a3700_spi *a3700_spi,
return 0;
}
static void a3700_spi_fifo_mode_set(struct a3700_spi *a3700_spi)
static void a3700_spi_fifo_mode_set(struct a3700_spi *a3700_spi, bool enable)
{
u32 val;
val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG);
val |= A3700_SPI_FIFO_MODE;
if (enable)
val |= A3700_SPI_FIFO_MODE;
else
val &= ~A3700_SPI_FIFO_MODE;
spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val);
}
@ -291,7 +294,7 @@ static int a3700_spi_init(struct a3700_spi *a3700_spi)
a3700_spi_deactivate_cs(a3700_spi, i);
/* Enable FIFO mode */
a3700_spi_fifo_mode_set(a3700_spi);
a3700_spi_fifo_mode_set(a3700_spi, true);
/* Set SPI mode */
a3700_spi_mode_set(a3700_spi, master->mode_bits);