media: s5p-mfc: replace custom reserved memory handling code with generic one

This patch removes custom code for initialization and handling of
reserved memory regions in s5p-mfc driver and replaces it with generic
reserved memory regions api.

s5p-mfc driver now handles two reserved memory regions defined by
generic reserved memory bindings. Support for non-dt platform has been
removed, because all supported platforms have been already converted to
device tree.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
Tested-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>

drivers/media/platform/s5p-mfc/s5p_mfc.c

@@ -22,6 +22,7 @@
 #include <media/v4l2-event.h>
 #include <linux/workqueue.h>
 #include <linux/of.h>
+#include <linux/of_reserved_mem.h>
 #include <media/videobuf2-v4l2.h>
 #include "s5p_mfc_common.h"
 #include "s5p_mfc_ctrl.h"
@@ -1043,66 +1044,71 @@ static const struct v4l2_file_operations s5p_mfc_fops = {
 	.mmap = s5p_mfc_mmap,
 };
 
-static int match_child(struct device *dev, void *data)
+/* DMA memory related helper functions */
+static void s5p_mfc_memdev_release(struct device *dev)
 {
-	if (!dev_name(dev))
-		return 0;
-	return !strcmp(dev_name(dev), (char *)data);
+	of_reserved_mem_device_release(dev);
 }
 
-static void s5p_mfc_memdev_release(struct device *dev)
+static struct device *s5p_mfc_alloc_memdev(struct device *dev,
+					   const char *name, unsigned int idx)
 {
-	dma_release_declared_memory(dev);
-}
+	struct device *child;
+	int ret;
 
-static void *mfc_get_drv_data(struct platform_device *pdev);
+	child = devm_kzalloc(dev, sizeof(struct device), GFP_KERNEL);
+	if (!child)
+		return NULL;
 
-static int s5p_mfc_alloc_memdevs(struct s5p_mfc_dev *dev)
-{
-	unsigned int mem_info[2] = { };
+	device_initialize(child);
+	dev_set_name(child, "%s:%s", dev_name(dev), name);
+	child->parent = dev;
+	child->bus = dev->bus;
+	child->coherent_dma_mask = dev->coherent_dma_mask;
+	child->dma_mask = dev->dma_mask;
+	child->release = s5p_mfc_memdev_release;
 
-	dev->mem_dev_l = devm_kzalloc(&dev->plat_dev->dev,
-			sizeof(struct device), GFP_KERNEL);
-	if (!dev->mem_dev_l) {
-		mfc_err("Not enough memory\n");
-		return -ENOMEM;
+	if (device_add(child) == 0) {
+		ret = of_reserved_mem_device_init_by_idx(child, dev->of_node,
+							 idx);
+		if (ret == 0)
+			return child;
 	}
 
-	dev_set_name(dev->mem_dev_l, "%s", "s5p-mfc-l");
-	dev->mem_dev_l->release = s5p_mfc_memdev_release;
-	device_initialize(dev->mem_dev_l);
-	of_property_read_u32_array(dev->plat_dev->dev.of_node,
-			"samsung,mfc-l", mem_info, 2);
-	if (dma_declare_coherent_memory(dev->mem_dev_l, mem_info[0],
-				mem_info[0], mem_info[1],
-				DMA_MEMORY_MAP | DMA_MEMORY_EXCLUSIVE) == 0) {
-		mfc_err("Failed to declare coherent memory for\n"
-		"MFC device\n");
-		return -ENOMEM;
-	}
+	put_device(child);
+	return NULL;
+}
 
-	dev->mem_dev_r = devm_kzalloc(&dev->plat_dev->dev,
-			sizeof(struct device), GFP_KERNEL);
-	if (!dev->mem_dev_r) {
-		mfc_err("Not enough memory\n");
-		return -ENOMEM;
-	}
+static int s5p_mfc_configure_dma_memory(struct s5p_mfc_dev *mfc_dev)
+{
+	struct device *dev = &mfc_dev->plat_dev->dev;
 
-	dev_set_name(dev->mem_dev_r, "%s", "s5p-mfc-r");
-	dev->mem_dev_r->release = s5p_mfc_memdev_release;
-	device_initialize(dev->mem_dev_r);
-	of_property_read_u32_array(dev->plat_dev->dev.of_node,
-			"samsung,mfc-r", mem_info, 2);
-	if (dma_declare_coherent_memory(dev->mem_dev_r, mem_info[0],
-				mem_info[0], mem_info[1],
-				DMA_MEMORY_MAP | DMA_MEMORY_EXCLUSIVE) == 0) {
-		pr_err("Failed to declare coherent memory for\n"
-		"MFC device\n");
-		return -ENOMEM;
+	/*
+	 * Create and initialize virtual devices for accessing
+	 * reserved memory regions.
+	 */
+	mfc_dev->mem_dev_l = s5p_mfc_alloc_memdev(dev, "left",
+						  MFC_BANK1_ALLOC_CTX);
+	if (!mfc_dev->mem_dev_l)
+		return -ENODEV;
+	mfc_dev->mem_dev_r = s5p_mfc_alloc_memdev(dev, "right",
+						  MFC_BANK2_ALLOC_CTX);
+	if (!mfc_dev->mem_dev_r) {
+		device_unregister(mfc_dev->mem_dev_l);
+		return -ENODEV;
 	}
+
 	return 0;
 }
 
+static void s5p_mfc_unconfigure_dma_memory(struct s5p_mfc_dev *mfc_dev)
+{
+	device_unregister(mfc_dev->mem_dev_l);
+	device_unregister(mfc_dev->mem_dev_r);
+}
+
+static void *mfc_get_drv_data(struct platform_device *pdev);
+
 /* MFC probe function */
 static int s5p_mfc_probe(struct platform_device *pdev)
 {
@@ -1128,12 +1134,6 @@ static int s5p_mfc_probe(struct platform_device *pdev)
 
 	dev->variant = mfc_get_drv_data(pdev);
 
-	ret = s5p_mfc_init_pm(dev);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "failed to get mfc clock source\n");
-		return ret;
-	}
-
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 
 	dev->regs_base = devm_ioremap_resource(&pdev->dev, res);
@@ -1154,25 +1154,16 @@ static int s5p_mfc_probe(struct platform_device *pdev)
 		goto err_res;
 	}
 
-	if (pdev->dev.of_node) {
-		ret = s5p_mfc_alloc_memdevs(dev);
-		if (ret < 0)
-			goto err_res;
-	} else {
-		dev->mem_dev_l = device_find_child(&dev->plat_dev->dev,
-				"s5p-mfc-l", match_child);
-		if (!dev->mem_dev_l) {
-			mfc_err("Mem child (L) device get failed\n");
-			ret = -ENODEV;
-			goto err_res;
-		}
-		dev->mem_dev_r = device_find_child(&dev->plat_dev->dev,
-				"s5p-mfc-r", match_child);
-		if (!dev->mem_dev_r) {
-			mfc_err("Mem child (R) device get failed\n");
-			ret = -ENODEV;
-			goto err_res;
+	ret = s5p_mfc_configure_dma_memory(dev);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to configure DMA memory\n");
+		return ret;
 	}
+
+	ret = s5p_mfc_init_pm(dev);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to get mfc clock source\n");
+		return ret;
 	}
 
 	vb2_dma_contig_set_max_seg_size(dev->mem_dev_l, DMA_BIT_MASK(32));
@@ -1309,12 +1300,9 @@ static int s5p_mfc_remove(struct platform_device *pdev)
 	s5p_mfc_release_firmware(dev);
 	vb2_dma_contig_cleanup_ctx(dev->alloc_ctx[0]);
 	vb2_dma_contig_cleanup_ctx(dev->alloc_ctx[1]);
+	s5p_mfc_unconfigure_dma_memory(dev);
 	vb2_dma_contig_clear_max_seg_size(dev->mem_dev_l);
 	vb2_dma_contig_clear_max_seg_size(dev->mem_dev_r);
-	if (pdev->dev.of_node) {
-		put_device(dev->mem_dev_l);
-		put_device(dev->mem_dev_r);
-	}
 
 	s5p_mfc_final_pm(dev);
 	return 0;