mirror of
https://github.com/torvalds/linux.git
synced 2024-12-03 17:41:22 +00:00
4f744affc3
This converts iounmap_fixed() to return success/error if it handled the unmap request or not. At the same time, drop the __init label, as this can be called in to later. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
150 lines
2.9 KiB
C
150 lines
2.9 KiB
C
/*
|
|
* Re-map IO memory to kernel address space so that we can access it.
|
|
*
|
|
* These functions should only be used when it is necessary to map a
|
|
* physical address space into the kernel address space before ioremap()
|
|
* can be used, e.g. early in boot before paging_init().
|
|
*
|
|
* Copyright (C) 2009 Matt Fleming
|
|
*/
|
|
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/io.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/slab.h>
|
|
#include <asm/fixmap.h>
|
|
#include <asm/page.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/addrspace.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/tlbflush.h>
|
|
#include <asm/mmu.h>
|
|
#include <asm/mmu_context.h>
|
|
|
|
struct ioremap_map {
|
|
void __iomem *addr;
|
|
unsigned long size;
|
|
unsigned long fixmap_addr;
|
|
};
|
|
|
|
static struct ioremap_map ioremap_maps[FIX_N_IOREMAPS];
|
|
|
|
void __init ioremap_fixed_init(void)
|
|
{
|
|
struct ioremap_map *map;
|
|
int i;
|
|
|
|
for (i = 0; i < FIX_N_IOREMAPS; i++) {
|
|
map = &ioremap_maps[i];
|
|
map->fixmap_addr = __fix_to_virt(FIX_IOREMAP_BEGIN + i);
|
|
}
|
|
}
|
|
|
|
void __init __iomem *
|
|
ioremap_fixed(resource_size_t phys_addr, unsigned long size, pgprot_t prot)
|
|
{
|
|
enum fixed_addresses idx0, idx;
|
|
resource_size_t last_addr;
|
|
struct ioremap_map *map;
|
|
unsigned long offset;
|
|
unsigned int nrpages;
|
|
int i, slot;
|
|
|
|
slot = -1;
|
|
for (i = 0; i < FIX_N_IOREMAPS; i++) {
|
|
map = &ioremap_maps[i];
|
|
if (!map->addr) {
|
|
map->size = size;
|
|
slot = i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (slot < 0)
|
|
return NULL;
|
|
|
|
/* Don't allow wraparound or zero size */
|
|
last_addr = phys_addr + size - 1;
|
|
if (!size || last_addr < phys_addr)
|
|
return NULL;
|
|
|
|
/*
|
|
* Fixmap mappings have to be page-aligned
|
|
*/
|
|
offset = phys_addr & ~PAGE_MASK;
|
|
phys_addr &= PAGE_MASK;
|
|
size = PAGE_ALIGN(last_addr + 1) - phys_addr;
|
|
|
|
/*
|
|
* Mappings have to fit in the FIX_IOREMAP area.
|
|
*/
|
|
nrpages = size >> PAGE_SHIFT;
|
|
if (nrpages > FIX_N_IOREMAPS)
|
|
return NULL;
|
|
|
|
/*
|
|
* Ok, go for it..
|
|
*/
|
|
idx0 = FIX_IOREMAP_BEGIN + slot;
|
|
idx = idx0;
|
|
while (nrpages > 0) {
|
|
pgprot_val(prot) |= _PAGE_WIRED;
|
|
__set_fixmap(idx, phys_addr, prot);
|
|
phys_addr += PAGE_SIZE;
|
|
idx++;
|
|
--nrpages;
|
|
}
|
|
|
|
map->addr = (void __iomem *)(offset + map->fixmap_addr);
|
|
return map->addr;
|
|
}
|
|
|
|
int iounmap_fixed(void __iomem *addr)
|
|
{
|
|
enum fixed_addresses idx;
|
|
unsigned long virt_addr;
|
|
struct ioremap_map *map;
|
|
unsigned long offset;
|
|
unsigned int nrpages;
|
|
int i, slot;
|
|
pgprot_t prot;
|
|
|
|
slot = -1;
|
|
for (i = 0; i < FIX_N_IOREMAPS; i++) {
|
|
map = &ioremap_maps[i];
|
|
if (map->addr == addr) {
|
|
slot = i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If we don't match, it's not for us.
|
|
*/
|
|
if (slot < 0)
|
|
return -EINVAL;
|
|
|
|
virt_addr = (unsigned long)addr;
|
|
|
|
offset = virt_addr & ~PAGE_MASK;
|
|
nrpages = PAGE_ALIGN(offset + map->size - 1) >> PAGE_SHIFT;
|
|
|
|
pgprot_val(prot) = _PAGE_WIRED;
|
|
|
|
idx = FIX_IOREMAP_BEGIN + slot + nrpages;
|
|
while (nrpages > 0) {
|
|
__clear_fixmap(idx, prot);
|
|
--idx;
|
|
--nrpages;
|
|
}
|
|
|
|
map->size = 0;
|
|
map->addr = NULL;
|
|
|
|
return 0;
|
|
}
|