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>
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 @@
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 @@
};
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 @@
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 @@
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 @@
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 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,