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spi: qup: refactor spi_qup_prep_sg

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Take specific sgl and nent to be prepared.  This is in
preparation for splitting DMA into multiple transacations, this
contains no code changes just refactoring.

Signed-off-by: Matthew McClintock <mmcclint@codeaurora.org>
Signed-off-by: Varadarajan Narayanan <varada@codeaurora.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Varadarajan Narayanan 2017-07-28 12:22:58 +05:30 committed by Mark Brown
parent 5dc47fefe1
commit a841b24e62
1 changed files with 10 additions and 13 deletions
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23
drivers/spi/spi-qup.c
View file

@ -382,27 +382,20 @@ static void spi_qup_write(struct spi_qup *controller)
} while (remainder);
}
static int spi_qup_prep_sg(struct spi_master *master, struct spi_transfer *xfer,
enum dma_transfer_direction dir,
static int spi_qup_prep_sg(struct spi_master *master, struct scatterlist *sgl,
unsigned int nents, enum dma_transfer_direction dir,
dma_async_tx_callback callback)
{
struct spi_qup *qup = spi_master_get_devdata(master);
unsigned long flags = DMA_PREP_INTERRUPT | DMA_PREP_FENCE;
struct dma_async_tx_descriptor *desc;
struct scatterlist *sgl;
struct dma_chan *chan;
dma_cookie_t cookie;
unsigned int nents;
if (dir == DMA_MEM_TO_DEV) {
if (dir == DMA_MEM_TO_DEV)
chan = master->dma_tx;
nents = xfer->tx_sg.nents;
sgl = xfer->tx_sg.sgl;
} else {
else
chan = master->dma_rx;
nents = xfer->rx_sg.nents;
sgl = xfer->rx_sg.sgl;
}
desc = dmaengine_prep_slave_sg(chan, sgl, nents, dir, flags);
if (IS_ERR_OR_NULL(desc))
@ -451,7 +444,9 @@ static int spi_qup_do_dma(struct spi_device *spi, struct spi_transfer *xfer,
}
if (xfer->rx_buf) {
ret = spi_qup_prep_sg(master, xfer, DMA_DEV_TO_MEM, rx_done);
ret = spi_qup_prep_sg(master, xfer->rx_sg.sgl,
xfer->rx_sg.nents, DMA_DEV_TO_MEM,
rx_done);
if (ret)
return ret;
@ -459,7 +454,9 @@ static int spi_qup_do_dma(struct spi_device *spi, struct spi_transfer *xfer,
}
if (xfer->tx_buf) {
ret = spi_qup_prep_sg(master, xfer, DMA_MEM_TO_DEV, tx_done);
ret = spi_qup_prep_sg(master, xfer->tx_sg.sgl,
xfer->tx_sg.nents, DMA_MEM_TO_DEV,
tx_done);
if (ret)
return ret;