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lib: devres: add a helper function for ioremap_wc

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Implement a resource managed writecombine ioremap function.

Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Abhilash Kesavan 2015-02-06 19:15:27 +05:30 committed by Greg Kroah-Hartman
parent 71a49d16f0
commit 34644524bc
3 changed files with 31 additions and 0 deletions
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1
Documentation/driver-model/devres.txt
View File

@ -276,6 +276,7 @@ IOMAP
devm_ioport_unmap()
devm_ioremap()
devm_ioremap_nocache()
devm_ioremap_wc()
devm_ioremap_resource() : checks resource, requests memory region, ioremaps
devm_iounmap()
pcim_iomap()

2
include/linux/io.h
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@ -64,6 +64,8 @@ void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
resource_size_t size);
void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
resource_size_t size);
void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
resource_size_t size);
void devm_iounmap(struct device *dev, void __iomem *addr);
int check_signature(const volatile void __iomem *io_addr,
const unsigned char *signature, int length);

28
lib/devres.c
View File

@ -71,6 +71,34 @@ void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
}
EXPORT_SYMBOL(devm_ioremap_nocache);
/**
* devm_ioremap_wc - Managed ioremap_wc()
* @dev: Generic device to remap IO address for
* @offset: BUS offset to map
* @size: Size of map
*
* Managed ioremap_wc(). Map is automatically unmapped on driver detach.
*/
void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
resource_size_t size)
{
void __iomem **ptr, *addr;
ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
if (!ptr)
return NULL;
addr = ioremap_wc(offset, size);
if (addr) {
*ptr = addr;
devres_add(dev, ptr);
} else
devres_free(ptr);
return addr;
}
EXPORT_SYMBOL(devm_ioremap_wc);
/**
* devm_iounmap - Managed iounmap()
* @dev: Generic device to unmap for