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/*
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/vmalloc.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <asm/cache.h>
void __iomem *ioremap(unsigned long paddr, unsigned long size)
{
unsigned long vaddr;
struct vm_struct *area;
unsigned long off, end;
const pgprot_t prot = PAGE_KERNEL_NO_CACHE;
/* Don't allow wraparound or zero size */
end = paddr + size - 1;
if (!size || (end < paddr))
return NULL;
/* If the region is h/w uncached, nothing special needed */
if (paddr >= ARC_UNCACHED_ADDR_SPACE)
return (void __iomem *)paddr;
/* An early platform driver might end up here */
if (!slab_is_available())
return NULL;
/* Mappings have to be page-aligned, page-sized */
off = paddr & ~PAGE_MASK;
paddr &= PAGE_MASK;
size = PAGE_ALIGN(end + 1) - paddr;
/*
* Ok, go for it..
*/
area = get_vm_area(size, VM_IOREMAP);
if (!area)
return NULL;
area->phys_addr = paddr;
vaddr = (unsigned long)area->addr;
if (ioremap_page_range(vaddr, vaddr + size, paddr, prot)) {
vfree(area->addr);
return NULL;
}
return (void __iomem *)(off + (char __iomem *)vaddr);
}
EXPORT_SYMBOL(ioremap);
void iounmap(const void __iomem *addr)
{
if (addr >= (void __force __iomem *)ARC_UNCACHED_ADDR_SPACE)
return;
vfree((void *)(PAGE_MASK & (unsigned long __force)addr));
}
EXPORT_SYMBOL(iounmap);
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