memremap: add MEMREMAP_WC flag

	/* See memremap() kernel-doc for usage description... */

	MEMREMAP_WB = 1 << 0,

	MEMREMAP_WT = 1 << 1,

	MEMREMAP_WC = 1 << 2,

};

void *memremap(resource_size_t offset, size_t size, unsigned long flags);

 * memremap() - remap an iomem_resource as cacheable memory

 * @offset: iomem resource start address

 * @size: size of remap

 * @flags: either MEMREMAP_WB or MEMREMAP_WT

 * @flags: any of MEMREMAP_WB, MEMREMAP_WT and MEMREMAP_WC

 *

 * memremap() is "ioremap" for cases where it is known that the resource

 * being mapped does not have i/o side effects and the __iomem

 * annotation is not applicable.

 * annotation is not applicable. In the case of multiple flags, the different

 * mapping types will be attempted in the order listed below until one of

 * them succeeds.

 *

 * MEMREMAP_WB - matches the default mapping for System RAM on

 * the architecture.  This is usually a read-allocate write-back cache.

 * cache or are written through to memory and never exist in a

 * cache-dirty state with respect to program visibility.  Attempts to

 * map System RAM with this mapping type will fail.

 *

 * MEMREMAP_WC - establish a writecombine mapping, whereby writes may

 * be coalesced together (e.g. in the CPU's write buffers), but is otherwise

 * uncached. Attempts to map System RAM with this mapping type will fail.

 */

void *memremap(resource_size_t offset, size_t size, unsigned long flags)

{

	if (!addr && (flags & MEMREMAP_WT))

		addr = ioremap_wt(offset, size);

	if (!addr && (flags & MEMREMAP_WC))

		addr = ioremap_wc(offset, size);

	return addr;

}

EXPORT_SYMBOL(memremap);