diff options
| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2015-03-09 15:48:46 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2015-03-09 19:11:13 +0100 |
| commit | 9f14538ecd1a210eff244a0a2281f6744fe4a59d (patch) | |
| tree | 3fbe4c565d59def0182e970ab19e039d55c66ebf /drivers/spi/spi-dw.c | |
| parent | spi: dw-mid: convert value of dma_width to enum dma_slave_buswidth (diff) | |
| download | linux-9f14538ecd1a210eff244a0a2281f6744fe4a59d.tar.xz linux-9f14538ecd1a210eff244a0a2281f6744fe4a59d.zip | |
spi: dw-mid: split dma_setup() from dma_transfer()
The patch splits DMA preparatory code to dma_setup() callback. The change also
converts transfer_one() to program DMA whenever the transfer is DMA mapped. The
change is a follow up of the converion to use SPI core transfer_one_message().
Since the DMA mapped transfers can be interleaved with PIO ones the DMA related
configuration should respect that.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-dw.c')
| -rw-r--r-- | drivers/spi/spi-dw.c | 23 |
1 files changed, 13 insertions, 10 deletions
diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c index f3e4092cd8dc..c7c2fcc2b58e 100644 --- a/drivers/spi/spi-dw.c +++ b/drivers/spi/spi-dw.c @@ -316,11 +316,11 @@ 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 imask = 0; - u8 cs_change = 0; u16 txlevel = 0; u16 clk_div = 0; u32 speed = 0; u32 cr0 = 0; + int ret; dws->n_bytes = chip->n_bytes; dws->dma_width = chip->dma_width; @@ -332,8 +332,6 @@ static int dw_spi_transfer_one(struct spi_master *master, dws->rx = transfer->rx_buf; dws->rx_end = dws->rx + transfer->len; dws->len = transfer->len; - if (chip != dws->prev_chip) - cs_change = 1; spi_enable_chip(dws, 0); @@ -397,7 +395,13 @@ static int dw_spi_transfer_one(struct spi_master *master, * Interrupt mode * we only need set the TXEI IRQ, as TX/RX always happen syncronizely */ - if (!dws->dma_mapped && !chip->poll_mode) { + if (dws->dma_mapped) { + ret = dws->dma_ops->dma_setup(dws); + if (ret < 0) { + spi_enable_chip(dws, 1); + return ret; + } + } else if (!chip->poll_mode) { txlevel = min_t(u16, dws->fifo_len / 2, dws->len / dws->n_bytes); dw_writew(dws, DW_SPI_TXFLTR, txlevel); @@ -411,11 +415,11 @@ static int dw_spi_transfer_one(struct spi_master *master, spi_enable_chip(dws, 1); - if (cs_change) - dws->prev_chip = chip; - - if (dws->dma_mapped) - dws->dma_ops->dma_transfer(dws, cs_change); + if (dws->dma_mapped) { + ret = dws->dma_ops->dma_transfer(dws); + if (ret < 0) + return ret; + } if (chip->poll_mode) return poll_transfer(dws); @@ -546,7 +550,6 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws) dws->master = master; dws->type = SSI_MOTO_SPI; - dws->prev_chip = NULL; dws->dma_inited = 0; dws->dma_addr = (dma_addr_t)(dws->paddr + 0x60); snprintf(dws->name, sizeof(dws->name), "dw_spi%d", dws->bus_num); |