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| author | Richard Genoud <richard.genoud@gmail.com> | 2013-05-31 17:01:59 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2013-06-03 16:22:50 +0100 |
| commit | 2f767a9f6b9d06a7e6a7b9b2ce0b6f0888ea15fa (patch) | |
| tree | 8b8da774a1555ecf78f7696931569a1ba23ac981 /drivers/spi/spi-atmel.c | |
| parent | d683b96b072dc4680fc74964eca77e6a23d1fa6e (diff) | |
| download | linux-2f767a9f6b9d06a7e6a7b9b2ce0b6f0888ea15fa.tar.gz linux-2f767a9f6b9d06a7e6a7b9b2ce0b6f0888ea15fa.tar.bz2 linux-2f767a9f6b9d06a7e6a7b9b2ce0b6f0888ea15fa.zip | |
spi: atmel: convert to dma_request_slave_channel_compat()
Use generic DMA DT helper.
Platforms booting with or without DT populated are both supported.
Based on Ludovic Desroches <ludovic.desroches@atmel.com> patchset
"ARM: at91: move to generic DMA device tree binding"
Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
Acked-by: Ludovic Desroches <ludovic.desroches@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'drivers/spi/spi-atmel.c')
| -rw-r--r-- | drivers/spi/spi-atmel.c | 42 |
1 files changed, 27 insertions, 15 deletions
diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c index 380387a47b1d..ceda43c91142 100644 --- a/drivers/spi/spi-atmel.c +++ b/drivers/spi/spi-atmel.c @@ -424,10 +424,15 @@ static int atmel_spi_dma_slave_config(struct atmel_spi *as, return err; } -static bool filter(struct dma_chan *chan, void *slave) +static bool filter(struct dma_chan *chan, void *pdata) { - struct at_dma_slave *sl = slave; + struct atmel_spi_dma *sl_pdata = pdata; + struct at_dma_slave *sl; + if (!sl_pdata) + return false; + + sl = &sl_pdata->dma_slave; if (sl->dma_dev == chan->device->dev) { chan->private = sl; return true; @@ -438,24 +443,31 @@ static bool filter(struct dma_chan *chan, void *slave) static int atmel_spi_configure_dma(struct atmel_spi *as) { - struct at_dma_slave *sdata = &as->dma.dma_slave; struct dma_slave_config slave_config; + struct device *dev = &as->pdev->dev; int err; - if (sdata && sdata->dma_dev) { - dma_cap_mask_t mask; + dma_cap_mask_t mask; + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); - /* Try to grab two DMA channels */ - dma_cap_zero(mask); - dma_cap_set(DMA_SLAVE, mask); - as->dma.chan_tx = dma_request_channel(mask, filter, sdata); - if (as->dma.chan_tx) - as->dma.chan_rx = - dma_request_channel(mask, filter, sdata); + as->dma.chan_tx = dma_request_slave_channel_compat(mask, filter, + &as->dma, + dev, "tx"); + if (!as->dma.chan_tx) { + dev_err(dev, + "DMA TX channel not available, SPI unable to use DMA\n"); + err = -EBUSY; + goto error; } - if (!as->dma.chan_rx || !as->dma.chan_tx) { - dev_err(&as->pdev->dev, - "DMA channel not available, SPI unable to use DMA\n"); + + as->dma.chan_rx = dma_request_slave_channel_compat(mask, filter, + &as->dma, + dev, "rx"); + + if (!as->dma.chan_rx) { + dev_err(dev, + "DMA RX channel not available, SPI unable to use DMA\n"); err = -EBUSY; goto error; } |