diff options
author | Shawn Guo <shawn.guo@linaro.org> | 2013-02-26 07:07:32 +0400 |
---|---|---|
committer | Shawn Guo <shawn.guo@linaro.org> | 2013-04-04 17:22:44 +0400 |
commit | 26aafa77df61c4190eae80646211ee6f07c88eaf (patch) | |
tree | 5ae896947ebde38999bd5271a8a13ad09a2b117d /drivers/spi/spi-mxs.c | |
parent | 0e91e434c86c84e84c46cf8bff2b5e53daee85d5 (diff) |
spi: mxs-spi: move to use generic DMA helper
With the generic DMA device tree helper supported by mxs-dma driver,
client devices only need to call dma_request_slave_channel() for
requesting a DMA channel from dmaengine.
Since mxs is a DT only platform now, along with the changes, the non-DT
case handling in probe function also gets removed.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'drivers/spi/spi-mxs.c')
-rw-r--r-- | drivers/spi/spi-mxs.c | 60 |
1 files changed, 9 insertions, 51 deletions
diff --git a/drivers/spi/spi-mxs.c b/drivers/spi/spi-mxs.c index 22a0af0147fb..7b1c014b0740 100644 --- a/drivers/spi/spi-mxs.c +++ b/drivers/spi/spi-mxs.c @@ -490,21 +490,6 @@ static int mxs_spi_transfer_one(struct spi_master *master, return status; } -static bool mxs_ssp_dma_filter(struct dma_chan *chan, void *param) -{ - struct mxs_ssp *ssp = param; - - if (!mxs_dma_is_apbh(chan)) - return false; - - if (chan->chan_id != ssp->dma_channel) - return false; - - chan->private = &ssp->dma_data; - - return true; -} - static const struct of_device_id mxs_spi_dt_ids[] = { { .compatible = "fsl,imx23-spi", .data = (void *) IMX23_SSP, }, { .compatible = "fsl,imx28-spi", .data = (void *) IMX28_SSP, }, @@ -520,13 +505,12 @@ static int mxs_spi_probe(struct platform_device *pdev) struct spi_master *master; struct mxs_spi *spi; struct mxs_ssp *ssp; - struct resource *iores, *dmares; + struct resource *iores; struct pinctrl *pinctrl; struct clk *clk; void __iomem *base; - int devid, dma_channel, clk_freq; - int ret = 0, irq_err, irq_dma; - dma_cap_mask_t mask; + int devid, clk_freq; + int ret = 0, irq_err; /* * Default clock speed for the SPI core. 160MHz seems to @@ -537,8 +521,7 @@ static int mxs_spi_probe(struct platform_device *pdev) iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); irq_err = platform_get_irq(pdev, 0); - irq_dma = platform_get_irq(pdev, 1); - if (!iores || irq_err < 0 || irq_dma < 0) + if (!iores || irq_err < 0) return -EINVAL; base = devm_ioremap_resource(&pdev->dev, iores); @@ -553,32 +536,11 @@ static int mxs_spi_probe(struct platform_device *pdev) if (IS_ERR(clk)) return PTR_ERR(clk); - if (np) { - devid = (enum mxs_ssp_id) of_id->data; - /* - * TODO: This is a temporary solution and should be changed - * to use generic DMA binding later when the helpers get in. - */ - ret = of_property_read_u32(np, "fsl,ssp-dma-channel", - &dma_channel); - if (ret) { - dev_err(&pdev->dev, - "Failed to get DMA channel\n"); - return -EINVAL; - } - - ret = of_property_read_u32(np, "clock-frequency", - &clk_freq); - if (ret) - clk_freq = clk_freq_default; - } else { - dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0); - if (!dmares) - return -EINVAL; - devid = pdev->id_entry->driver_data; - dma_channel = dmares->start; + devid = (enum mxs_ssp_id) of_id->data; + ret = of_property_read_u32(np, "clock-frequency", + &clk_freq); + if (ret) clk_freq = clk_freq_default; - } master = spi_alloc_master(&pdev->dev, sizeof(*spi)); if (!master) @@ -597,7 +559,6 @@ static int mxs_spi_probe(struct platform_device *pdev) ssp->clk = clk; ssp->base = base; ssp->devid = devid; - ssp->dma_channel = dma_channel; init_completion(&spi->c); @@ -606,10 +567,7 @@ static int mxs_spi_probe(struct platform_device *pdev) if (ret) goto out_master_free; - dma_cap_zero(mask); - dma_cap_set(DMA_SLAVE, mask); - ssp->dma_data.chan_irq = irq_dma; - ssp->dmach = dma_request_channel(mask, mxs_ssp_dma_filter, ssp); + ssp->dmach = dma_request_slave_channel(&pdev->dev, "rx-tx"); if (!ssp->dmach) { dev_err(ssp->dev, "Failed to request DMA\n"); goto out_master_free; |