aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--Documentation/driver-model/devres.txt1
-rw-r--r--include/linux/device.h3
-rw-r--r--lib/devres.c51
3 files changed, 55 insertions, 0 deletions
diff --git a/Documentation/driver-model/devres.txt b/Documentation/driver-model/devres.txt
index d79aead9418..10c64c8a13d 100644
--- a/Documentation/driver-model/devres.txt
+++ b/Documentation/driver-model/devres.txt
@@ -262,6 +262,7 @@ IOMAP
devm_ioremap()
devm_ioremap_nocache()
devm_iounmap()
+ devm_request_and_ioremap() : checks resource, requests region, ioremaps
pcim_iomap()
pcim_iounmap()
pcim_iomap_table() : array of mapped addresses indexed by BAR
diff --git a/include/linux/device.h b/include/linux/device.h
index ffbcf95cd97..c6335982774 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -490,6 +490,9 @@ extern int devres_release_group(struct device *dev, void *id);
extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
extern void devm_kfree(struct device *dev, void *p);
+void __iomem *devm_request_and_ioremap(struct device *dev,
+ struct resource *res);
+
struct device_dma_parameters {
/*
* a low level driver may set these to teach IOMMU code about
diff --git a/lib/devres.c b/lib/devres.c
index 78777aea5b3..4fbc09e6e9e 100644
--- a/lib/devres.c
+++ b/lib/devres.c
@@ -85,6 +85,57 @@ void devm_iounmap(struct device *dev, void __iomem *addr)
}
EXPORT_SYMBOL(devm_iounmap);
+/**
+ * devm_request_and_ioremap() - Check, request region, and ioremap resource
+ * @dev: Generic device to handle the resource for
+ * @res: resource to be handled
+ *
+ * Takes all necessary steps to ioremap a mem resource. Uses managed device, so
+ * everything is undone on driver detach. Checks arguments, so you can feed
+ * it the result from e.g. platform_get_resource() directly. Returns the
+ * remapped pointer or NULL on error. Usage example:
+ *
+ * res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ * base = devm_request_and_ioremap(&pdev->dev, res);
+ * if (!base)
+ * return -EADDRNOTAVAIL;
+ */
+void __iomem *devm_request_and_ioremap(struct device *dev,
+ struct resource *res)
+{
+ resource_size_t size;
+ const char *name;
+ void __iomem *dest_ptr;
+
+ BUG_ON(!dev);
+
+ if (!res || resource_type(res) != IORESOURCE_MEM) {
+ dev_err(dev, "invalid resource\n");
+ return NULL;
+ }
+
+ size = resource_size(res);
+ name = res->name ?: dev_name(dev);
+
+ if (!devm_request_mem_region(dev, res->start, size, name)) {
+ dev_err(dev, "can't request region for resource %pR\n", res);
+ return NULL;
+ }
+
+ if (res->flags & IORESOURCE_CACHEABLE)
+ dest_ptr = devm_ioremap(dev, res->start, size);
+ else
+ dest_ptr = devm_ioremap_nocache(dev, res->start, size);
+
+ if (!dest_ptr) {
+ dev_err(dev, "ioremap failed for resource %pR\n", res);
+ devm_release_mem_region(dev, res->start, size);
+ }
+
+ return dest_ptr;
+}
+EXPORT_SYMBOL(devm_request_and_ioremap);
+
#ifdef CONFIG_HAS_IOPORT
/*
* Generic iomap devres