68 lines
1.6 KiB
C
68 lines
1.6 KiB
C
|
/*
|
||
|
|
* 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);
|