diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/spi/davinci_spi.c | 58 |
1 files changed, 23 insertions, 35 deletions
diff --git a/drivers/spi/davinci_spi.c b/drivers/spi/davinci_spi.c index a47947da17a3..6094e3a07853 100644 --- a/drivers/spi/davinci_spi.c +++ b/drivers/spi/davinci_spi.c @@ -118,9 +118,6 @@ struct davinci_spi_dma { int dma_rx_channel; int dummy_param_slot; enum dma_event_q eventq; - - struct completion dma_tx_completion; - struct completion dma_rx_completion; }; /* SPI Controller driver's private data. */ @@ -386,32 +383,6 @@ static int davinci_spi_setup_transfer(struct spi_device *spi, return 0; } -static void davinci_spi_dma_rx_callback(unsigned lch, u16 ch_status, void *data) -{ - struct davinci_spi *davinci_spi = data; - struct davinci_spi_dma *davinci_spi_dma = &davinci_spi->dma_channels; - - edma_stop(davinci_spi_dma->dma_rx_channel); - - if (ch_status == DMA_COMPLETE) - davinci_spi->rcount = 0; - - complete(&davinci_spi_dma->dma_rx_completion); -} - -static void davinci_spi_dma_tx_callback(unsigned lch, u16 ch_status, void *data) -{ - struct davinci_spi *davinci_spi = data; - struct davinci_spi_dma *davinci_spi_dma = &davinci_spi->dma_channels; - - edma_stop(davinci_spi_dma->dma_tx_channel); - - if (ch_status == DMA_COMPLETE) - davinci_spi->wcount = 0; - - complete(&davinci_spi_dma->dma_tx_completion); -} - /** * davinci_spi_setup - This functions will set default transfer method * @spi: spi device on which data transfer to be done @@ -630,6 +601,25 @@ static irqreturn_t davinci_spi_irq(s32 irq, void *context_data) return IRQ_HANDLED; } +static void davinci_spi_dma_callback(unsigned lch, u16 status, void *data) +{ + struct davinci_spi *davinci_spi = data; + struct davinci_spi_dma *davinci_spi_dma = &davinci_spi->dma_channels; + + edma_stop(lch); + + if (status == DMA_COMPLETE) { + if (lch == davinci_spi_dma->dma_rx_channel) + davinci_spi->rcount = 0; + if (lch == davinci_spi_dma->dma_tx_channel) + davinci_spi->wcount = 0; + } + + if ((!davinci_spi->wcount && !davinci_spi->rcount) || + (status != DMA_COMPLETE)) + complete(&davinci_spi->done); +} + static int davinci_spi_bufs_dma(struct spi_device *spi, struct spi_transfer *t) { struct davinci_spi *davinci_spi; @@ -660,8 +650,7 @@ static int davinci_spi_bufs_dma(struct spi_device *spi, struct spi_transfer *t) davinci_spi->wcount = t->len / data_type; davinci_spi->rcount = davinci_spi->wcount; - init_completion(&davinci_spi_dma->dma_rx_completion); - init_completion(&davinci_spi_dma->dma_tx_completion); + INIT_COMPLETION(davinci_spi->done); /* disable all interrupts for dma transfers */ clear_io_bits(davinci_spi->base + SPIINT, SPIINT_MASKALL); @@ -752,8 +741,7 @@ static int davinci_spi_bufs_dma(struct spi_device *spi, struct spi_transfer *t) edma_start(davinci_spi_dma->dma_tx_channel); set_io_bits(davinci_spi->base + SPIINT, SPIINT_DMA_REQ_EN); - wait_for_completion_interruptible(&davinci_spi_dma->dma_tx_completion); - wait_for_completion_interruptible(&davinci_spi_dma->dma_rx_completion); + wait_for_completion_interruptible(&davinci_spi->done); if (t->tx_buf) dma_unmap_single(NULL, t->tx_dma, davinci_spi->wcount, @@ -787,7 +775,7 @@ static int davinci_spi_request_dma(struct davinci_spi *davinci_spi) struct davinci_spi_dma *davinci_spi_dma = &davinci_spi->dma_channels; r = edma_alloc_channel(davinci_spi_dma->dma_rx_channel, - davinci_spi_dma_rx_callback, davinci_spi, + davinci_spi_dma_callback, davinci_spi, davinci_spi_dma->eventq); if (r < 0) { pr_err("Unable to request DMA channel for SPI RX\n"); @@ -796,7 +784,7 @@ static int davinci_spi_request_dma(struct davinci_spi *davinci_spi) } r = edma_alloc_channel(davinci_spi_dma->dma_tx_channel, - davinci_spi_dma_tx_callback, davinci_spi, + davinci_spi_dma_callback, davinci_spi, davinci_spi_dma->eventq); if (r < 0) { pr_err("Unable to request DMA channel for SPI TX\n"); |