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[PATCH] Generic ioremap_page_range: mips conversion 

Convert MIPS to use generic ioremap_page_range()

[yoichi_yuasa@tripeaks.co.jp: build fix]
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Haavard Skinnemoen 2006-12-08 02:38:04 -08:00 committed by Linus Torvalds
parent 62dfb5541a
commit 8e087929df
1 changed files with 8 additions and 88 deletions
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96
arch/mips/mm/ioremap.c
View File

@ -6,98 +6,13 @@
* (C) Copyright 1995 1996 Linus Torvalds
* (C) Copyright 2001, 2002 Ralf Baechle
*/
#include <linux/mm.h>
#include <linux/module.h>
#include <asm/addrspace.h>
#include <asm/byteorder.h>
#include <linux/vmalloc.h>
#include <asm/cacheflush.h>
#include <asm/io.h>
#include <asm/tlbflush.h>
static inline void remap_area_pte(pte_t * pte, unsigned long address,
phys_t size, phys_t phys_addr, unsigned long flags)
{
phys_t end;
unsigned long pfn;
pgprot_t pgprot = __pgprot(_PAGE_GLOBAL | _PAGE_PRESENT | __READABLE
| __WRITEABLE | flags);
address &= ~PMD_MASK;
end = address + size;
if (end > PMD_SIZE)
end = PMD_SIZE;
if (address >= end)
BUG();
pfn = phys_addr >> PAGE_SHIFT;
do {
if (!pte_none(*pte)) {
printk("remap_area_pte: page already exists\n");
BUG();
}
set_pte(pte, pfn_pte(pfn, pgprot));
address += PAGE_SIZE;
pfn++;
pte++;
} while (address && (address < end));
}
static inline int remap_area_pmd(pmd_t * pmd, unsigned long address,
phys_t size, phys_t phys_addr, unsigned long flags)
{
phys_t end;
address &= ~PGDIR_MASK;
end = address + size;
if (end > PGDIR_SIZE)
end = PGDIR_SIZE;
phys_addr -= address;
if (address >= end)
BUG();
do {
pte_t * pte = pte_alloc_kernel(pmd, address);
if (!pte)
return -ENOMEM;
remap_area_pte(pte, address, end - address, address + phys_addr, flags);
address = (address + PMD_SIZE) & PMD_MASK;
pmd++;
} while (address && (address < end));
return 0;
}
static int remap_area_pages(unsigned long address, phys_t phys_addr,
phys_t size, unsigned long flags)
{
int error;
pgd_t * dir;
unsigned long end = address + size;
phys_addr -= address;
dir = pgd_offset(&init_mm, address);
flush_cache_all();
if (address >= end)
BUG();
do {
pud_t *pud;
pmd_t *pmd;
error = -ENOMEM;
pud = pud_alloc(&init_mm, dir, address);
if (!pud)
break;
pmd = pmd_alloc(&init_mm, pud, address);
if (!pmd)
break;
if (remap_area_pmd(pmd, address, end - address,
phys_addr + address, flags))
break;
error = 0;
address = (address + PGDIR_SIZE) & PGDIR_MASK;
dir++;
} while (address && (address < end));
flush_tlb_all();
return error;
}
#include <linux/io.h>
/*
* Generic mapping function (not visible outside):
@ -121,6 +36,7 @@ void __iomem * __ioremap(phys_t phys_addr, phys_t size, unsigned long flags)
unsigned long offset;
phys_t last_addr;
void * addr;
pgprot_t pgprot;
phys_addr = fixup_bigphys_addr(phys_addr, size);
@ -152,6 +68,9 @@ void __iomem * __ioremap(phys_t phys_addr, phys_t size, unsigned long flags)
return NULL;
}
pgprot = __pgprot(_PAGE_GLOBAL | _PAGE_PRESENT | __READABLE
| __WRITEABLE | flags);
/*
* Mappings have to be page-aligned
*/
@ -166,7 +85,8 @@ void __iomem * __ioremap(phys_t phys_addr, phys_t size, unsigned long flags)
if (!area)
return NULL;
addr = area->addr;
if (remap_area_pages((unsigned long) addr, phys_addr, size, flags)) {
if (ioremap_page_range((unsigned long)addr, (unsigned long)addr + size,
phys_addr, pgprot)) {
vunmap(addr);
return NULL;
}