diff options
author | Markus Pargmann <mpa@pengutronix.de> | 2013-05-26 09:53:20 (GMT) |
---|---|---|
committer | Vinod Koul <vinod.koul@intel.com> | 2013-07-05 06:10:26 (GMT) |
commit | 290ad0f9d954b445788bf26652b239c59cec2060 (patch) | |
tree | bee92be4769a1f84d599e2e97cd3cc6e25f2caa9 /drivers/dma/imx-dma.c | |
parent | 8552bb4f16800d5ebc176a2cf5f2aa55b22731ea (diff) | |
download | linux-290ad0f9d954b445788bf26652b239c59cec2060.tar.xz |
dma: imx-dma: Add oftree support
Adding devicetree support for imx-dma driver. Use driver name for
function 'imx_dma_is_general_purpose' because the devicename for
devicetree initialized devices is different.
Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/imx-dma.c')
-rw-r--r-- | drivers/dma/imx-dma.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/drivers/dma/imx-dma.c b/drivers/dma/imx-dma.c index f285833..34c54cf 100644 --- a/drivers/dma/imx-dma.c +++ b/drivers/dma/imx-dma.c @@ -27,6 +27,8 @@ #include <linux/clk.h> #include <linux/dmaengine.h> #include <linux/module.h> +#include <linux/of_device.h> +#include <linux/of_dma.h> #include <asm/irq.h> #include <linux/platform_data/dma-imx.h> @@ -186,6 +188,11 @@ struct imxdma_engine { enum imx_dma_type devtype; }; +struct imxdma_filter_data { + struct imxdma_engine *imxdma; + int request; +}; + static struct platform_device_id imx_dma_devtype[] = { { .name = "imx1-dma", @@ -202,6 +209,22 @@ static struct platform_device_id imx_dma_devtype[] = { }; MODULE_DEVICE_TABLE(platform, imx_dma_devtype); +static const struct of_device_id imx_dma_of_dev_id[] = { + { + .compatible = "fsl,imx1-dma", + .data = &imx_dma_devtype[IMX1_DMA], + }, { + .compatible = "fsl,imx21-dma", + .data = &imx_dma_devtype[IMX21_DMA], + }, { + .compatible = "fsl,imx27-dma", + .data = &imx_dma_devtype[IMX27_DMA], + }, { + /* sentinel */ + } +}; +MODULE_DEVICE_TABLE(of, imx_dma_of_dev_id); + static inline int is_imx1_dma(struct imxdma_engine *imxdma) { return imxdma->devtype == IMX1_DMA; @@ -996,13 +1019,50 @@ static void imxdma_issue_pending(struct dma_chan *chan) spin_unlock_irqrestore(&imxdma->lock, flags); } +static bool imxdma_filter_fn(struct dma_chan *chan, void *param) +{ + struct imxdma_filter_data *fdata = param; + struct imxdma_channel *imxdma_chan = to_imxdma_chan(chan); + + if (chan->device->dev != fdata->imxdma->dev) + return false; + + imxdma_chan->dma_request = fdata->request; + chan->private = NULL; + + return true; +} + +static struct dma_chan *imxdma_xlate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + int count = dma_spec->args_count; + struct imxdma_engine *imxdma = ofdma->of_dma_data; + struct imxdma_filter_data fdata = { + .imxdma = imxdma, + }; + + if (count != 1) + return NULL; + + fdata.request = dma_spec->args[0]; + + return dma_request_channel(imxdma->dma_device.cap_mask, + imxdma_filter_fn, &fdata); +} + static int __init imxdma_probe(struct platform_device *pdev) { struct imxdma_engine *imxdma; struct resource *res; + const struct of_device_id *of_id; int ret, i; int irq, irq_err; + of_id = of_match_device(imx_dma_of_dev_id, &pdev->dev); + if (of_id) + pdev->id_entry = of_id->data; + imxdma = devm_kzalloc(&pdev->dev, sizeof(*imxdma), GFP_KERNEL); if (!imxdma) return -ENOMEM; @@ -1136,8 +1196,19 @@ static int __init imxdma_probe(struct platform_device *pdev) goto err; } + if (pdev->dev.of_node) { + ret = of_dma_controller_register(pdev->dev.of_node, + imxdma_xlate, imxdma); + if (ret) { + dev_err(&pdev->dev, "unable to register of_dma_controller\n"); + goto err_of_dma_controller; + } + } + return 0; +err_of_dma_controller: + dma_async_device_unregister(&imxdma->dma_device); err: clk_disable_unprepare(imxdma->dma_ipg); clk_disable_unprepare(imxdma->dma_ahb); @@ -1150,6 +1221,9 @@ static int imxdma_remove(struct platform_device *pdev) dma_async_device_unregister(&imxdma->dma_device); + if (pdev->dev.of_node) + of_dma_controller_free(pdev->dev.of_node); + clk_disable_unprepare(imxdma->dma_ipg); clk_disable_unprepare(imxdma->dma_ahb); @@ -1159,6 +1233,7 @@ static int imxdma_remove(struct platform_device *pdev) static struct platform_driver imxdma_driver = { .driver = { .name = "imx-dma", + .of_match_table = imx_dma_of_dev_id, }, .id_table = imx_dma_devtype, .remove = imxdma_remove, |