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spi/ep93xx: add DMA support

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This patch adds DMA support for the EP93xx SPI driver. By default the DMA is
not enabled but it can be enabled by setting ep93xx_spi_info.use_dma to true
in board configuration file.

Note that the SPI driver still uses PIO for small transfers (<= 8 bytes) for
performance reasons.

Signed-off-by: Mika Westerberg <[email protected]>
Acked-by: H Hartley Sweeten <[email protected]>
Acked-by: Vinod Koul <[email protected]>
Signed-off-by: Grant Likely <[email protected]>
This commit is contained in:
Mika Westerberg 2011-05-29 13:10:06 +03:00 • committed by Grant Likely
commit 626a96db11
4 changed files with 308 additions and 13 deletions
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10
Documentation/spi/ep93xx_spi
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@ -88,6 +88,16 @@ static void __init ts72xx_init_machine(void)
ARRAY_SIZE(ts72xx_spi_devices));
}
The driver can use DMA for the transfers also. In this case ts72xx_spi_info
becomes:
static struct ep93xx_spi_info ts72xx_spi_info = {
.num_chipselect = ARRAY_SIZE(ts72xx_spi_devices),
.use_dma = true;
};
Note that CONFIG_EP93XX_DMA should be enabled as well.
Thanks to
=========
Martin Guy, H. Hartley Sweeten and others who helped me during development of