107 lines
2.6 KiB
C
Executable file
107 lines
2.6 KiB
C
Executable file
/*
|
|
* 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 <linux/cache.h>
|
|
|
|
static inline bool arc_uncached_addr_space(phys_addr_t paddr)
|
|
{
|
|
if (is_isa_arcompact()) {
|
|
if (paddr >= ARC_UNCACHED_ADDR_SPACE)
|
|
return true;
|
|
} else if (paddr >= perip_base && paddr <= perip_end) {
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
void __iomem *ioremap(phys_addr_t paddr, unsigned long size)
|
|
{
|
|
phys_addr_t end;
|
|
|
|
/* Don't allow wraparound or zero size */
|
|
end = paddr + size - 1;
|
|
if (!size || (end < paddr))
|
|
return NULL;
|
|
|
|
/*
|
|
* If the region is h/w uncached, MMU mapping can be elided as optim
|
|
* The cast to u32 is fine as this region can only be inside 4GB
|
|
*/
|
|
if (arc_uncached_addr_space(paddr))
|
|
return (void __iomem *)(u32)paddr;
|
|
|
|
return ioremap_prot(paddr, size, PAGE_KERNEL_NO_CACHE);
|
|
}
|
|
EXPORT_SYMBOL(ioremap);
|
|
|
|
/*
|
|
* ioremap with access flags
|
|
* Cache semantics wise it is same as ioremap - "forced" uncached.
|
|
* However unlike vanilla ioremap which bypasses ARC MMU for addresses in
|
|
* ARC hardware uncached region, this one still goes thru the MMU as caller
|
|
* might need finer access control (R/W/X)
|
|
*/
|
|
void __iomem *ioremap_prot(phys_addr_t paddr, unsigned long size,
|
|
unsigned long flags)
|
|
{
|
|
unsigned long vaddr;
|
|
struct vm_struct *area;
|
|
phys_addr_t off, end;
|
|
pgprot_t prot = __pgprot(flags);
|
|
|
|
/* Don't allow wraparound, zero size */
|
|
end = paddr + size - 1;
|
|
if ((!size) || (end < paddr))
|
|
return NULL;
|
|
|
|
/* An early platform driver might end up here */
|
|
if (!slab_is_available())
|
|
return NULL;
|
|
|
|
/* force uncached */
|
|
prot = pgprot_noncached(prot);
|
|
|
|
/* Mappings have to be page-aligned */
|
|
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)) {
|
|
vunmap((void __force *)vaddr);
|
|
return NULL;
|
|
}
|
|
return (void __iomem *)(off + (char __iomem *)vaddr);
|
|
}
|
|
EXPORT_SYMBOL(ioremap_prot);
|
|
|
|
|
|
void iounmap(const void __iomem *addr)
|
|
{
|
|
/* weird double cast to handle phys_addr_t > 32 bits */
|
|
if (arc_uncached_addr_space((phys_addr_t)(u32)addr))
|
|
return;
|
|
|
|
vfree((void *)(PAGE_MASK & (unsigned long __force)addr));
|
|
}
|
|
EXPORT_SYMBOL(iounmap);
|