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author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2014-10-28 18:25:01 +0200 |
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committer | Mark Brown <broonie@kernel.org> | 2014-10-28 22:40:38 +0000 |
commit | a5c2db964d3eb26b41bd7abc1b13486f732b3aa2 (patch) | |
tree | c1ac9e5491f7c46ca33f56fba0fed223d35aee7b /drivers/spi/spi-dw-mid.c | |
parent | b7a40242c82cd73cfcea305f23e67d068dd8401a (diff) | |
download | linux-a5c2db964d3eb26b41bd7abc1b13486f732b3aa2.tar.bz2 |
spi: dw-mid: refactor to use helpers
This patch splits few helpers, namely dw_spi_dma_prepare_rx(),
dw_spi_dma_prepare_tx(), and dw_spi_dma_setup() which will be useful for the
consequent improvements.
There is no functional change.
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-mid.c')
-rw-r--r-- | drivers/spi/spi-dw-mid.c | 69 |
1 files changed, 48 insertions, 21 deletions
diff --git a/drivers/spi/spi-dw-mid.c b/drivers/spi/spi-dw-mid.c index 46c6d58e1fda..c8319ab0bbdf 100644 --- a/drivers/spi/spi-dw-mid.c +++ b/drivers/spi/spi-dw-mid.c @@ -111,28 +111,11 @@ static void dw_spi_dma_done(void *arg) dw_spi_xfer_done(dws); } -static int mid_spi_dma_transfer(struct dw_spi *dws, int cs_change) +static struct dma_async_tx_descriptor *dw_spi_dma_prepare_tx(struct dw_spi *dws) { - struct dma_async_tx_descriptor *txdesc, *rxdesc; - struct dma_slave_config txconf, rxconf; - u16 dma_ctrl = 0; - - /* 1. setup DMA related registers */ - if (cs_change) { - spi_enable_chip(dws, 0); - dw_writew(dws, DW_SPI_DMARDLR, 0xf); - dw_writew(dws, DW_SPI_DMATDLR, 0x10); - if (dws->tx_dma) - dma_ctrl |= SPI_DMA_TDMAE; - if (dws->rx_dma) - dma_ctrl |= SPI_DMA_RDMAE; - dw_writew(dws, DW_SPI_DMACR, dma_ctrl); - spi_enable_chip(dws, 1); - } + struct dma_slave_config txconf; + struct dma_async_tx_descriptor *txdesc; - dws->dma_chan_done = 0; - - /* 2. Prepare the TX dma transfer */ txconf.direction = DMA_MEM_TO_DEV; txconf.dst_addr = dws->dma_addr; txconf.dst_maxburst = LNW_DMA_MSIZE_16; @@ -154,7 +137,14 @@ static int mid_spi_dma_transfer(struct dw_spi *dws, int cs_change) txdesc->callback = dw_spi_dma_done; txdesc->callback_param = dws; - /* 3. Prepare the RX dma transfer */ + return txdesc; +} + +static struct dma_async_tx_descriptor *dw_spi_dma_prepare_rx(struct dw_spi *dws) +{ + struct dma_slave_config rxconf; + struct dma_async_tx_descriptor *rxdesc; + rxconf.direction = DMA_DEV_TO_MEM; rxconf.src_addr = dws->dma_addr; rxconf.src_maxburst = LNW_DMA_MSIZE_16; @@ -176,6 +166,43 @@ static int mid_spi_dma_transfer(struct dw_spi *dws, int cs_change) rxdesc->callback = dw_spi_dma_done; rxdesc->callback_param = dws; + return rxdesc; +} + +static void dw_spi_dma_setup(struct dw_spi *dws) +{ + u16 dma_ctrl = 0; + + spi_enable_chip(dws, 0); + + dw_writew(dws, DW_SPI_DMARDLR, 0xf); + dw_writew(dws, DW_SPI_DMATDLR, 0x10); + + if (dws->tx_dma) + dma_ctrl |= SPI_DMA_TDMAE; + if (dws->rx_dma) + dma_ctrl |= SPI_DMA_RDMAE; + dw_writew(dws, DW_SPI_DMACR, dma_ctrl); + + spi_enable_chip(dws, 1); +} + +static int mid_spi_dma_transfer(struct dw_spi *dws, int cs_change) +{ + struct dma_async_tx_descriptor *txdesc, *rxdesc; + + /* 1. setup DMA related registers */ + if (cs_change) + dw_spi_dma_setup(dws); + + dws->dma_chan_done = 0; + + /* 2. Prepare the TX dma transfer */ + txdesc = dw_spi_dma_prepare_tx(dws); + + /* 3. Prepare the RX dma transfer */ + rxdesc = dw_spi_dma_prepare_rx(dws); + /* rx must be started before tx due to spi instinct */ dmaengine_submit(rxdesc); dma_async_issue_pending(dws->rxchan); |