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>

1 files changed, 75 insertions, 0 deletions

diff --git a/drivers/dma/imx-dma.c b/drivers/dma/imx-dma.c
index f28583370d00..34c54cf08231 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,