dmaengine: ste_dma40: use dmaenginem_async_device_register to simplify the code

[linux-2.6-microblaze.git] / lib / devres.c

diff --git a/lib/devres.c b/lib/devres.c
index 5bec112..faccf1a 100644 (file)
--- a/lib/devres.c
+++ b/lib/devres.c
@@ -4,6 +4,7 @@
 #include <linux/io.h>
 #include <linux/gfp.h>
 #include <linux/export.h>
+#include <linux/of_address.h>
 
 enum devm_ioremap_type {
        DEVM_IOREMAP = 0,
@@ -162,6 +163,41 @@ void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res)
 }
 EXPORT_SYMBOL(devm_ioremap_resource);
 
+/*
+ * devm_of_iomap - Requests a resource and maps the memory mapped IO
+ *                for a given device_node managed by a given device
+ *
+ * Checks that a resource is a valid memory region, requests the memory
+ * region and ioremaps it. All operations are managed and will be undone
+ * on driver detach of the device.
+ *
+ * This is to be used when a device requests/maps resources described
+ * by other device tree nodes (children or otherwise).
+ *
+ * @dev:       The device "managing" the resource
+ * @node:       The device-tree node where the resource resides
+ * @index:     index of the MMIO range in the "reg" property
+ * @size:      Returns the size of the resource (pass NULL if not needed)
+ * Returns a pointer to the requested and mapped memory or an ERR_PTR() encoded
+ * error code on failure. Usage example:
+ *
+ *     base = devm_of_iomap(&pdev->dev, node, 0, NULL);
+ *     if (IS_ERR(base))
+ *             return PTR_ERR(base);
+ */
+void __iomem *devm_of_iomap(struct device *dev, struct device_node *node, int index,
+                           resource_size_t *size)
+{
+       struct resource res;
+
+       if (of_address_to_resource(node, index, &res))
+               return IOMEM_ERR_PTR(-EINVAL);
+       if (size)
+               *size = resource_size(&res);
+       return devm_ioremap_resource(dev, &res);
+}
+EXPORT_SYMBOL(devm_of_iomap);
+
 #ifdef CONFIG_HAS_IOPORT_MAP
 /*
  * Generic iomap devres