diff options
author | Peter Ujfalusi <peter.ujfalusi@ti.com> | 2016-04-29 16:10:22 +0300 |
---|---|---|
committer | Mark Brown <broonie@kernel.org> | 2016-04-29 18:15:15 +0100 |
commit | fe5fd2540947a6c584e70f1249007dd636e62d78 (patch) | |
tree | 9f41d0ed04470586ad88ddc0cbed8764e33dfa55 | |
parent | f55532a0c0b8bb6148f4e07853b876ef73bc69ca (diff) | |
download | op-kernel-dev-fe5fd2540947a6c584e70f1249007dd636e62d78.zip op-kernel-dev-fe5fd2540947a6c584e70f1249007dd636e62d78.tar.gz |
spi: davinci: Use dma_request_chan() for requesting DMA channel
With the new dma_request_chan() the client driver does not need to look for
the DMA resource and it does not need to pass filter_fn anymore.
By switching to the new API the driver can now support deferred probing
against DMA.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
-rw-r--r-- | drivers/spi/spi-davinci.c | 76 |
1 files changed, 24 insertions, 52 deletions
diff --git a/drivers/spi/spi-davinci.c b/drivers/spi/spi-davinci.c index fddb7a3..d36c11b 100644 --- a/drivers/spi/spi-davinci.c +++ b/drivers/spi/spi-davinci.c @@ -23,7 +23,6 @@ #include <linux/clk.h> #include <linux/dmaengine.h> #include <linux/dma-mapping.h> -#include <linux/edma.h> #include <linux/of.h> #include <linux/of_device.h> #include <linux/of_gpio.h> @@ -33,8 +32,6 @@ #include <linux/platform_data/spi-davinci.h> -#define SPI_NO_RESOURCE ((resource_size_t)-1) - #define CS_DEFAULT 0xFF #define SPIFMT_PHASE_MASK BIT(16) @@ -130,8 +127,6 @@ struct davinci_spi { struct dma_chan *dma_rx; struct dma_chan *dma_tx; - int dma_rx_chnum; - int dma_tx_chnum; struct davinci_spi_platform_data pdata; @@ -797,35 +792,19 @@ static irqreturn_t davinci_spi_irq(s32 irq, void *data) static int davinci_spi_request_dma(struct davinci_spi *dspi) { - dma_cap_mask_t mask; struct device *sdev = dspi->bitbang.master->dev.parent; - int r; - - dma_cap_zero(mask); - dma_cap_set(DMA_SLAVE, mask); - dspi->dma_rx = dma_request_channel(mask, edma_filter_fn, - &dspi->dma_rx_chnum); - if (!dspi->dma_rx) { - dev_err(sdev, "request RX DMA channel failed\n"); - r = -ENODEV; - goto rx_dma_failed; - } + dspi->dma_rx = dma_request_chan(sdev, "rx"); + if (IS_ERR(dspi->dma_rx)) + return PTR_ERR(dspi->dma_rx); - dspi->dma_tx = dma_request_channel(mask, edma_filter_fn, - &dspi->dma_tx_chnum); - if (!dspi->dma_tx) { - dev_err(sdev, "request TX DMA channel failed\n"); - r = -ENODEV; - goto tx_dma_failed; + dspi->dma_tx = dma_request_chan(sdev, "tx"); + if (IS_ERR(dspi->dma_tx)) { + dma_release_channel(dspi->dma_rx); + return PTR_ERR(dspi->dma_tx); } return 0; - -tx_dma_failed: - dma_release_channel(dspi->dma_rx); -rx_dma_failed: - return r; } #if defined(CONFIG_OF) @@ -936,8 +915,6 @@ static int davinci_spi_probe(struct platform_device *pdev) struct davinci_spi *dspi; struct davinci_spi_platform_data *pdata; struct resource *r; - resource_size_t dma_rx_chan = SPI_NO_RESOURCE; - resource_size_t dma_tx_chan = SPI_NO_RESOURCE; int ret = 0; u32 spipc0; @@ -1044,27 +1021,15 @@ static int davinci_spi_probe(struct platform_device *pdev) } } - r = platform_get_resource(pdev, IORESOURCE_DMA, 0); - if (r) - dma_rx_chan = r->start; - r = platform_get_resource(pdev, IORESOURCE_DMA, 1); - if (r) - dma_tx_chan = r->start; - dspi->bitbang.txrx_bufs = davinci_spi_bufs; - if (dma_rx_chan != SPI_NO_RESOURCE && - dma_tx_chan != SPI_NO_RESOURCE) { - dspi->dma_rx_chnum = dma_rx_chan; - dspi->dma_tx_chnum = dma_tx_chan; - - ret = davinci_spi_request_dma(dspi); - if (ret) - goto free_clk; - - dev_info(&pdev->dev, "DMA: supported\n"); - dev_info(&pdev->dev, "DMA: RX channel: %pa, TX channel: %pa, event queue: %d\n", - &dma_rx_chan, &dma_tx_chan, - pdata->dma_event_q); + + ret = davinci_spi_request_dma(dspi); + if (ret == -EPROBE_DEFER) { + goto free_clk; + } else if (ret) { + dev_info(&pdev->dev, "DMA is not supported (%d)\n", ret); + dspi->dma_rx = NULL; + dspi->dma_tx = NULL; } dspi->get_rx = davinci_spi_rx_buf_u8; @@ -1102,8 +1067,10 @@ static int davinci_spi_probe(struct platform_device *pdev) return ret; free_dma: - dma_release_channel(dspi->dma_rx); - dma_release_channel(dspi->dma_tx); + if (dspi->dma_rx) { + dma_release_channel(dspi->dma_rx); + dma_release_channel(dspi->dma_tx); + } free_clk: clk_disable_unprepare(dspi->clk); free_master: @@ -1134,6 +1101,11 @@ static int davinci_spi_remove(struct platform_device *pdev) clk_disable_unprepare(dspi->clk); spi_master_put(master); + if (dspi->dma_rx) { + dma_release_channel(dspi->dma_rx); + dma_release_channel(dspi->dma_tx); + } + return 0; } |