dmaengine: OMAP: Register SDMA controller with Device Tree DMA driver

If the device-tree blob is present during boot, then register the SDMA
controller with the device-tree DMA driver so that we can use device-tree
to look-up DMA client information.

Signed-off-by: Jon Hunter <jon-hunter@ti.com>
Reviewed-by: Felipe Balbi <balbi@ti.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Tested-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

2 files changed, 40 insertions, 2 deletions

diff --git a/arch/arm/mach-omap2/dma.c b/arch/arm/mach-omap2/dma.c
index dab9fc014b97..49fd0d501c9b 100644
--- a/arch/arm/mach-omap2/dma.c
+++ b/arch/arm/mach-omap2/dma.c
@@ -28,6 +28,7 @@
 #include <linux/init.h>
 #include <linux/device.h>
 #include <linux/dma-mapping.h>
+#include <linux/of.h>
 #include <linux/omap-dma.h>
 
 #include "soc.h"
@@ -304,6 +305,9 @@ static int __init omap2_system_dma_init(void)
         if (res)
                 return res;
 
+        if (of_have_populated_dt())
+                return res;
+
         pdev = platform_device_register_full(&omap_dma_dev_info);
         if (IS_ERR(pdev))
                 return PTR_ERR(pdev);
diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c
index 08b43bf37158..ec3fc4fd9160 100644
--- a/drivers/dma/omap-dma.c
+++ b/drivers/dma/omap-dma.c
@@ -16,6 +16,8 @@
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
+#include <linux/of_dma.h>
+#include <linux/of_device.h>
 
 #include "virt-dma.h"
 
@@ -67,6 +69,10 @@ static const unsigned es_bytes[] = {
         [OMAP_DMA_DATA_TYPE_S32] = 4,
 };
 
+static struct of_dma_filter_info omap_dma_info = {
+        .filter_fn = omap_dma_filter_fn,
+};
+
 static inline struct omap_dmadev *to_omap_dma_dev(struct dma_device *d)
 {
         return container_of(d, struct omap_dmadev, ddev);
@@ -629,8 +635,22 @@ static int omap_dma_probe(struct platform_device *pdev)
                 pr_warn("OMAP-DMA: failed to register slave DMA engine device: %d\n",
                         rc);
                 omap_dma_free(od);
-        } else {
-                platform_set_drvdata(pdev, od);
+                return rc;
+        }
+
+        platform_set_drvdata(pdev, od);
+
+        if (pdev->dev.of_node) {
+                omap_dma_info.dma_cap = od->ddev.cap_mask;
+
+                /* Device-tree DMA controller registration */
+                rc = of_dma_controller_register(pdev->dev.of_node,
+                                of_dma_simple_xlate, &omap_dma_info);
+                if (rc) {
+                        pr_warn("OMAP-DMA: failed to register DMA controller\n");
+                        dma_async_device_unregister(&od->ddev);
+                        omap_dma_free(od);
+                }
         }
 
         dev_info(&pdev->dev, "OMAP DMA engine driver\n");
@@ -642,18 +662,32 @@ static int omap_dma_remove(struct platform_device *pdev)
 {
         struct omap_dmadev *od = platform_get_drvdata(pdev);
 
+        if (pdev->dev.of_node)
+                of_dma_controller_free(pdev->dev.of_node);
+
         dma_async_device_unregister(&od->ddev);
         omap_dma_free(od);
 
         return 0;
 }
 
+static const struct of_device_id omap_dma_match[] = {
+        { .compatible = "ti,omap2420-sdma", },
+        { .compatible = "ti,omap2430-sdma", },
+        { .compatible = "ti,omap3430-sdma", },
+        { .compatible = "ti,omap3630-sdma", },
+        { .compatible = "ti,omap4430-sdma", },
+        {},
+};
+MODULE_DEVICE_TABLE(of, omap_dma_match);
+
 static struct platform_driver omap_dma_driver = {
         .probe  = omap_dma_probe,
         .remove = omap_dma_remove,
         .driver = {
                 .name = "omap-dma-engine",
                 .owner = THIS_MODULE,
+                .of_match_table = of_match_ptr(omap_dma_match),
         },
 };