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spi: dw-mid: convert value of dma_width to enum dma_slave_buswidth

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DMAEngine has a specific type to be used for bus width. This patch converts the
code to use the values of the specific type when configure DMA transfer.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Andy Shevchenko 2015-03-09 16:48:45 +02:00 committed by Mark Brown
parent 0365fbd4bb
commit e31abce778
2 changed files with 19 additions and 6 deletions
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13
drivers/spi/spi-dw-mid.c
View File

@ -100,6 +100,15 @@ static void mid_spi_dma_exit(struct dw_spi *dws)
dma_release_channel(dws->rxchan);
}
static enum dma_slave_buswidth convert_dma_width(u32 dma_width) {
if (dma_width == 1)
return DMA_SLAVE_BUSWIDTH_1_BYTE;
else if (dma_width == 2)
return DMA_SLAVE_BUSWIDTH_2_BYTES;
return DMA_SLAVE_BUSWIDTH_UNDEFINED;
}
/*
* dws->dma_chan_busy is set before the dma transfer starts, callback for tx
* channel will clear a corresponding bit.
@ -126,7 +135,7 @@ static struct dma_async_tx_descriptor *dw_spi_dma_prepare_tx(struct dw_spi *dws)
txconf.dst_addr = dws->dma_addr;
txconf.dst_maxburst = LNW_DMA_MSIZE_16;
txconf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
txconf.dst_addr_width = dws->dma_width;
txconf.dst_addr_width = convert_dma_width(dws->dma_width);
txconf.device_fc = false;
dmaengine_slave_config(dws->txchan, &txconf);
@ -175,7 +184,7 @@ static struct dma_async_tx_descriptor *dw_spi_dma_prepare_rx(struct dw_spi *dws)
rxconf.src_addr = dws->dma_addr;
rxconf.src_maxburst = LNW_DMA_MSIZE_16;
rxconf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
rxconf.src_addr_width = dws->dma_width;
rxconf.src_addr_width = convert_dma_width(dws->dma_width);
rxconf.device_fc = false;
dmaengine_slave_config(dws->rxchan, &rxconf);

12
drivers/spi/spi-dw.c
View File

@ -315,7 +315,6 @@ static int dw_spi_transfer_one(struct spi_master *master,
{
struct dw_spi *dws = spi_master_get_devdata(master);
struct chip_data *chip = spi_get_ctldata(spi);
u8 bits = 0;
u8 imask = 0;
u8 cs_change = 0;
u16 txlevel = 0;
@ -357,9 +356,14 @@ static int dw_spi_transfer_one(struct spi_master *master,
}
}
if (transfer->bits_per_word) {
bits = transfer->bits_per_word;
dws->n_bytes = dws->dma_width = bits >> 3;
cr0 = (bits - 1)
if (transfer->bits_per_word == 8) {
dws->n_bytes = 1;
dws->dma_width = 1;
} else if (transfer->bits_per_word == 16) {
dws->n_bytes = 2;
dws->dma_width = 2;
}
cr0 = (transfer->bits_per_word - 1)
| (chip->type << SPI_FRF_OFFSET)
| (spi->mode << SPI_MODE_OFFSET)
| (chip->tmode << SPI_TMOD_OFFSET);