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-rw-r--r--lib/devres.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/lib/devres.c b/lib/devres.c
index 78777aea5b34..4fbc09e6e9e6 100644
--- a/lib/devres.c
+++ b/lib/devres.c
@@ -85,6 +85,57 @@ void devm_iounmap(struct device *dev, void __iomem *addr)
85} 85}
86EXPORT_SYMBOL(devm_iounmap); 86EXPORT_SYMBOL(devm_iounmap);
87 87
88/**
89 * devm_request_and_ioremap() - Check, request region, and ioremap resource
90 * @dev: Generic device to handle the resource for
91 * @res: resource to be handled
92 *
93 * Takes all necessary steps to ioremap a mem resource. Uses managed device, so
94 * everything is undone on driver detach. Checks arguments, so you can feed
95 * it the result from e.g. platform_get_resource() directly. Returns the
96 * remapped pointer or NULL on error. Usage example:
97 *
98 * res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
99 * base = devm_request_and_ioremap(&pdev->dev, res);
100 * if (!base)
101 * return -EADDRNOTAVAIL;
102 */
103void __iomem *devm_request_and_ioremap(struct device *dev,
104 struct resource *res)
105{
106 resource_size_t size;
107 const char *name;
108 void __iomem *dest_ptr;
109
110 BUG_ON(!dev);
111
112 if (!res || resource_type(res) != IORESOURCE_MEM) {
113 dev_err(dev, "invalid resource\n");
114 return NULL;
115 }
116
117 size = resource_size(res);
118 name = res->name ?: dev_name(dev);
119
120 if (!devm_request_mem_region(dev, res->start, size, name)) {
121 dev_err(dev, "can't request region for resource %pR\n", res);
122 return NULL;
123 }
124
125 if (res->flags & IORESOURCE_CACHEABLE)
126 dest_ptr = devm_ioremap(dev, res->start, size);
127 else
128 dest_ptr = devm_ioremap_nocache(dev, res->start, size);
129
130 if (!dest_ptr) {
131 dev_err(dev, "ioremap failed for resource %pR\n", res);
132 devm_release_mem_region(dev, res->start, size);
133 }
134
135 return dest_ptr;
136}
137EXPORT_SYMBOL(devm_request_and_ioremap);
138
88#ifdef CONFIG_HAS_IOPORT 139#ifdef CONFIG_HAS_IOPORT
89/* 140/*
90 * Generic iomap devres 141 * Generic iomap devres