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Commit 34644524 authored by Abhilash Kesavan's avatar Abhilash Kesavan Committed by Greg Kroah-Hartman
Browse files

lib: devres: add a helper function for ioremap_wc 



Implement a resource managed writecombine ioremap function.

Signed-off-by: default avatarAbhilash Kesavan <a.kesavan@samsung.com>
Acked-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 71a49d16

Documentation/driver-model/devres.txt

+1 −0
Original line number Diff line number Diff line
@@ -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()

include/linux/io.h

+2 −0
Original line number Diff line number Diff line
@@ -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);

lib/devres.c

+28 −0
Original line number Diff line number Diff line
@@ -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