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spi/pxa2xx: add support for DMA engine

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To be able to use DMA with this driver on non-PXA platforms we implement
support for the generic DMA engine API. This lets user to use different DMA
engines with little or no modification to the driver.

Request lines and channel numbers can be passed to the driver from the
platform specific data.

The DMA engine implementation will be selected by default even on PXA
platform. User can select the legacy DMA API by enabling Kconfig option
CONFIG_SPI_PXA2XX_PXADMA.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Lu Cao <lucao@marvell.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mika Westerberg
2013-01-22 12:26:29 +02:00
committed by Mark Brown
parent cd7bed0034
commit 5928808ef6
6 changed files with 437 additions and 3 deletions
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6
include/linux/spi/pxa2xx_spi.h
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@@ -29,6 +29,12 @@ struct pxa2xx_spi_master {
u16 num_chipselect;
u8 enable_dma;
/* DMA engine specific config */
int rx_chan_id;
int tx_chan_id;
int rx_slave_id;
int tx_slave_id;
/* For non-PXA arches */
struct ssp_device ssp;
};