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spi: a3700: Allow to enable or disable FIFO mode

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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
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9
drivers/spi/spi-armada-3700.c
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@ -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);