2005-04-17 00:20:36 +02:00
|
|
|
/*
|
|
|
|
* arch/parisc/mm/ioremap.c
|
|
|
|
*
|
|
|
|
* (C) Copyright 1995 1996 Linus Torvalds
|
|
|
|
* (C) Copyright 2001 Helge Deller <deller@gmx.de>
|
2006-01-11 02:47:52 +01:00
|
|
|
* (C) Copyright 2005 Kyle McMartin <kyle@parisc-linux.org>
|
2005-04-17 00:20:36 +02:00
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/vmalloc.h>
|
|
|
|
#include <linux/errno.h>
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <asm/io.h>
|
|
|
|
#include <asm/pgalloc.h>
|
2006-01-11 02:47:52 +01:00
|
|
|
#include <asm/tlbflush.h>
|
|
|
|
#include <asm/cacheflush.h>
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2006-01-11 02:47:52 +01:00
|
|
|
static inline void
|
|
|
|
remap_area_pte(pte_t *pte, unsigned long address, unsigned long size,
|
|
|
|
unsigned long phys_addr, unsigned long flags)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2006-01-11 02:47:52 +01:00
|
|
|
unsigned long end, pfn;
|
|
|
|
pgprot_t pgprot = __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY |
|
|
|
|
_PAGE_ACCESSED | flags);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
address &= ~PMD_MASK;
|
2006-01-11 02:47:52 +01:00
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
end = address + size;
|
|
|
|
if (end > PMD_SIZE)
|
|
|
|
end = PMD_SIZE;
|
2006-01-11 02:47:52 +01:00
|
|
|
|
|
|
|
BUG_ON(address >= end);
|
|
|
|
|
|
|
|
pfn = phys_addr >> PAGE_SHIFT;
|
2005-04-17 00:20:36 +02:00
|
|
|
do {
|
2006-01-11 02:47:52 +01:00
|
|
|
BUG_ON(!pte_none(*pte));
|
|
|
|
|
|
|
|
set_pte(pte, pfn_pte(pfn, pgprot));
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
address += PAGE_SIZE;
|
2006-01-11 02:47:52 +01:00
|
|
|
pfn++;
|
2005-04-17 00:20:36 +02:00
|
|
|
pte++;
|
|
|
|
} while (address && (address < end));
|
|
|
|
}
|
|
|
|
|
2006-01-11 02:47:52 +01:00
|
|
|
static inline int
|
|
|
|
remap_area_pmd(pmd_t *pmd, unsigned long address, unsigned long size,
|
|
|
|
unsigned long phys_addr, unsigned long flags)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
|
|
|
unsigned long end;
|
|
|
|
|
|
|
|
address &= ~PGDIR_MASK;
|
2006-01-11 02:47:52 +01:00
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
end = address + size;
|
|
|
|
if (end > PGDIR_SIZE)
|
|
|
|
end = PGDIR_SIZE;
|
2006-01-11 02:47:52 +01:00
|
|
|
|
|
|
|
BUG_ON(address >= end);
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
phys_addr -= address;
|
|
|
|
do {
|
2006-01-11 02:47:52 +01:00
|
|
|
pte_t *pte = pte_alloc_kernel(pmd, address);
|
2005-04-17 00:20:36 +02:00
|
|
|
if (!pte)
|
|
|
|
return -ENOMEM;
|
2006-01-11 02:47:52 +01:00
|
|
|
|
|
|
|
remap_area_pte(pte, address, end - address,
|
|
|
|
address + phys_addr, flags);
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
address = (address + PMD_SIZE) & PMD_MASK;
|
|
|
|
pmd++;
|
|
|
|
} while (address && (address < end));
|
2006-01-11 02:47:52 +01:00
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2006-01-11 02:47:52 +01:00
|
|
|
static int
|
|
|
|
remap_area_pages(unsigned long address, unsigned long phys_addr,
|
|
|
|
unsigned long size, unsigned long flags)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2006-01-11 02:47:52 +01:00
|
|
|
pgd_t *dir;
|
|
|
|
int error = 0;
|
2005-04-17 00:20:36 +02:00
|
|
|
unsigned long end = address + size;
|
|
|
|
|
2006-01-11 02:47:52 +01:00
|
|
|
BUG_ON(address >= end);
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
phys_addr -= address;
|
2006-01-11 02:47:52 +01:00
|
|
|
dir = pgd_offset_k(address);
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
flush_cache_all();
|
2006-01-11 02:47:52 +01:00
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
do {
|
2006-01-11 02:47:52 +01:00
|
|
|
pud_t *pud;
|
2005-04-17 00:20:36 +02:00
|
|
|
pmd_t *pmd;
|
2006-01-11 02:47:52 +01:00
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
error = -ENOMEM;
|
2006-01-11 02:47:52 +01:00
|
|
|
pud = pud_alloc(&init_mm, dir, address);
|
|
|
|
if (!pud)
|
|
|
|
break;
|
|
|
|
|
|
|
|
pmd = pmd_alloc(&init_mm, pud, address);
|
2005-04-17 00:20:36 +02:00
|
|
|
if (!pmd)
|
|
|
|
break;
|
2006-01-11 02:47:52 +01:00
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
if (remap_area_pmd(pmd, address, end - address,
|
2006-01-11 02:47:52 +01:00
|
|
|
phys_addr + address, flags))
|
2005-04-17 00:20:36 +02:00
|
|
|
break;
|
2006-01-11 02:47:52 +01:00
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
error = 0;
|
|
|
|
address = (address + PGDIR_SIZE) & PGDIR_MASK;
|
|
|
|
dir++;
|
|
|
|
} while (address && (address < end));
|
2006-01-11 02:47:52 +01:00
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
flush_tlb_all();
|
2006-01-11 02:47:52 +01:00
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Generic mapping function (not visible outside):
|
|
|
|
*/
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Remap an arbitrary physical address space into the kernel virtual
|
2006-01-11 02:47:52 +01:00
|
|
|
* address space.
|
2005-04-17 00:20:36 +02:00
|
|
|
*
|
|
|
|
* NOTE! We need to allow non-page-aligned mappings too: we will obviously
|
|
|
|
* have to convert them into an offset in a page-aligned mapping, but the
|
|
|
|
* caller shouldn't need to know that small detail.
|
|
|
|
*/
|
|
|
|
void __iomem * __ioremap(unsigned long phys_addr, unsigned long size, unsigned long flags)
|
|
|
|
{
|
2006-03-23 08:40:10 +01:00
|
|
|
void *addr;
|
|
|
|
struct vm_struct *area;
|
|
|
|
unsigned long offset, last_addr;
|
|
|
|
|
2006-03-23 08:32:46 +01:00
|
|
|
#ifdef CONFIG_EISA
|
2005-04-17 00:20:36 +02:00
|
|
|
unsigned long end = phys_addr + size - 1;
|
|
|
|
/* Support EISA addresses */
|
2006-03-26 10:54:16 +02:00
|
|
|
if ((phys_addr >= 0x00080000 && end < 0x000fffff) ||
|
|
|
|
(phys_addr >= 0x00500000 && end < 0x03bfffff)) {
|
|
|
|
phys_addr |= F_EXTEND(0xfc000000);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/* Don't allow wraparound or zero size */
|
|
|
|
last_addr = phys_addr + size - 1;
|
|
|
|
if (!size || last_addr < phys_addr)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Don't allow anybody to remap normal RAM that we're using..
|
|
|
|
*/
|
|
|
|
if (phys_addr < virt_to_phys(high_memory)) {
|
|
|
|
char *t_addr, *t_end;
|
|
|
|
struct page *page;
|
|
|
|
|
|
|
|
t_addr = __va(phys_addr);
|
|
|
|
t_end = t_addr + (size - 1);
|
|
|
|
|
2006-01-11 02:47:52 +01:00
|
|
|
for (page = virt_to_page(t_addr);
|
|
|
|
page <= virt_to_page(t_end); page++) {
|
2005-04-17 00:20:36 +02:00
|
|
|
if(!PageReserved(page))
|
|
|
|
return NULL;
|
2006-01-11 02:47:52 +01:00
|
|
|
}
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Mappings have to be page-aligned
|
|
|
|
*/
|
|
|
|
offset = phys_addr & ~PAGE_MASK;
|
|
|
|
phys_addr &= PAGE_MASK;
|
|
|
|
size = PAGE_ALIGN(last_addr) - phys_addr;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Ok, go for it..
|
|
|
|
*/
|
|
|
|
area = get_vm_area(size, VM_IOREMAP);
|
|
|
|
if (!area)
|
|
|
|
return NULL;
|
2006-01-11 02:47:52 +01:00
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
addr = area->addr;
|
|
|
|
if (remap_area_pages((unsigned long) addr, phys_addr, size, flags)) {
|
|
|
|
vfree(addr);
|
|
|
|
return NULL;
|
|
|
|
}
|
2006-01-11 02:47:52 +01:00
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
return (void __iomem *) (offset + (char *)addr);
|
|
|
|
}
|
2006-03-30 00:18:32 +02:00
|
|
|
EXPORT_SYMBOL(__ioremap);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
void iounmap(void __iomem *addr)
|
|
|
|
{
|
|
|
|
if (addr > high_memory)
|
|
|
|
return vfree((void *) (PAGE_MASK & (unsigned long __force) addr));
|
|
|
|
}
|
2006-03-30 00:18:32 +02:00
|
|
|
EXPORT_SYMBOL(iounmap);
|