3 files changed, 87 insertions, 12 deletions

diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c
index 6ca8e519968..7768804457e 100644
--- a/arch/arm/mach-omap2/omap_hwmod.c
+++ b/arch/arm/mach-omap2/omap_hwmod.c
@@ -3158,6 +3158,33 @@ int omap_hwmod_fill_resources(struct omap_hwmod *oh, struct resource *res)
 }
 
 /**
+ * omap_hwmod_fill_dma_resources - fill struct resource array with dma data
+ * @oh: struct omap_hwmod *
+ * @res: pointer to the array of struct resource to fill
+ *
+ * Fill the struct resource array @res with dma resource data from the
+ * omap_hwmod @oh.  Intended to be called by code that registers
+ * omap_devices.  See also omap_hwmod_count_resources().  Returns the
+ * number of array elements filled.
+ */
+int omap_hwmod_fill_dma_resources(struct omap_hwmod *oh, struct resource *res)
+{
+	int i, sdma_reqs_cnt;
+	int r = 0;
+
+	sdma_reqs_cnt = _count_sdma_reqs(oh);
+	for (i = 0; i < sdma_reqs_cnt; i++) {
+		(res + r)->name = (oh->sdma_reqs + i)->name;
+		(res + r)->start = (oh->sdma_reqs + i)->dma_req;
+		(res + r)->end = (oh->sdma_reqs + i)->dma_req;
+		(res + r)->flags = IORESOURCE_DMA;
+		r++;
+	}
+
+	return r;
+}
+
+/**
  * omap_hwmod_get_resource_byname - fetch IP block integration data by name
  * @oh: struct omap_hwmod * to operate on
  * @type: one of the IORESOURCE_* constants from include/linux/ioport.h
diff --git a/arch/arm/plat-omap/include/plat/omap_hwmod.h b/arch/arm/plat-omap/include/plat/omap_hwmod.h
index 6132972aff3..5857b9cd6eb 100644
--- a/arch/arm/plat-omap/include/plat/omap_hwmod.h
+++ b/arch/arm/plat-omap/include/plat/omap_hwmod.h
@@ -615,6 +615,7 @@ int omap_hwmod_softreset(struct omap_hwmod *oh);
 
 int omap_hwmod_count_resources(struct omap_hwmod *oh);
 int omap_hwmod_fill_resources(struct omap_hwmod *oh, struct resource *res);
+int omap_hwmod_fill_dma_resources(struct omap_hwmod *oh, struct resource *res);
 int omap_hwmod_get_resource_byname(struct omap_hwmod *oh, unsigned int type,
 				   const char *name, struct resource *res);
 
diff --git a/arch/arm/plat-omap/omap_device.c b/arch/arm/plat-omap/omap_device.c
index ff57b5aeba4..6f5c5809681 100644
--- a/arch/arm/plat-omap/omap_device.c
+++ b/arch/arm/plat-omap/omap_device.c
@@ -494,6 +494,33 @@ static int omap_device_fill_resources(struct omap_device *od,
 }
 
 /**
+ * _od_fill_dma_resources - fill in array of struct resource with dma resources
+ * @od: struct omap_device *
+ * @res: pointer to an array of struct resource to be filled in
+ *
+ * Populate one or more empty struct resource pointed to by @res with
+ * the dma resource data for this omap_device @od.  Used by
+ * omap_device_alloc() after calling omap_device_count_resources().
+ *
+ * Ideally this function would not be needed at all.  If we have
+ * mechanism to get dma resources from DT.
+ *
+ * Returns 0.
+ */
+static int _od_fill_dma_resources(struct omap_device *od,
+				      struct resource *res)
+{
+	int i, r;
+
+	for (i = 0; i < od->hwmods_cnt; i++) {
+		r = omap_hwmod_fill_dma_resources(od->hwmods[i], res);
+		res += r;
+	}
+
+	return 0;
+}
+
+/**
  * omap_device_alloc - allocate an omap_device
  * @pdev: platform_device that will be included in this omap_device
  * @oh: ptr to the single omap_hwmod that backs this omap_device
@@ -532,24 +559,44 @@ struct omap_device *omap_device_alloc(struct platform_device *pdev,
 	od->hwmods = hwmods;
 	od->pdev = pdev;
 
+	res_count = omap_device_count_resources(od);
 	/*
-	 * HACK: Ideally the resources from DT should match, and hwmod
-	 * should just add the missing ones. Since the name is not
-	 * properly populated by DT, stick to hwmod resources only.
+	 * DT Boot:
+	 *   OF framework will construct the resource structure (currently
+	 *   does for MEM & IRQ resource) and we should respect/use these
+	 *   resources, killing hwmod dependency.
+	 *   If pdev->num_resources > 0, we assume that MEM & IRQ resources
+	 *   have been allocated by OF layer already (through DTB).
+	 *
+	 * Non-DT Boot:
+	 *   Here, pdev->num_resources = 0, and we should get all the
+	 *   resources from hwmod.
+	 *
+	 * TODO: Once DMA resource is available from OF layer, we should
+	 *   kill filling any resources from hwmod.
 	 */
-	if (pdev->num_resources && pdev->resource)
-		dev_warn(&pdev->dev, "%s(): resources already allocated %d\n",
-			__func__, pdev->num_resources);
-
-	res_count = omap_device_count_resources(od);
-	if (res_count > 0) {
-		dev_dbg(&pdev->dev, "%s(): resources allocated from hwmod %d\n",
-			__func__, res_count);
+	if (res_count > pdev->num_resources) {
+		/* Allocate resources memory to account for new resources */
 		res = kzalloc(sizeof(struct resource) * res_count, GFP_KERNEL);
 		if (!res)
 			goto oda_exit3;
 
-		omap_device_fill_resources(od, res);
+		/*
+		 * If pdev->num_resources > 0, then assume that,
+		 * MEM and IRQ resources will only come from DT and only
+		 * fill DMA resource from hwmod layer.
+		 */
+		if (pdev->num_resources && pdev->resource) {
+			dev_dbg(&pdev->dev, "%s(): resources already allocated %d\n",
+				__func__, res_count);
+			memcpy(res, pdev->resource,
+			       sizeof(struct resource) * pdev->num_resources);
+			_od_fill_dma_resources(od, &res[pdev->num_resources]);
+		} else {
+			dev_dbg(&pdev->dev, "%s(): using resources from hwmod %d\n",
+				__func__, res_count);
+			omap_device_fill_resources(od, res);
+		}
 
 		ret = platform_device_add_resources(pdev, res, res_count);
 		kfree(res);