69d3a84a64
This patch provides a device drivers, which has a omap iommu, with address mapping APIs between device virtual address(iommu), physical address and MPU virtual address. There are 4 possible patterns for iommu virtual address(iova/da) mapping. |iova/ mapping iommu_ page | da pa va (d)-(p)-(v) function type --------------------------------------------------------------------------- 1 | c c c 1 - 1 - 1 _kmap() / _kunmap() s 2 | c c,a c 1 - 1 - 1 _kmalloc()/ _kfree() s 3 | c d c 1 - n - 1 _vmap() / _vunmap() s 4 | c d,a c 1 - n - 1 _vmalloc()/ _vfree() n* 'iova': device iommu virtual address 'da': alias of 'iova' 'pa': physical address 'va': mpu virtual address 'c': contiguous memory area 'd': dicontiguous memory area 'a': anonymous memory allocation '()': optional feature 'n': a normal page(4KB) size is used. 's': multiple iommu superpage(16MB, 1MB, 64KB, 4KB) size is used. '*': not yet, but feasible. Signed-off-by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
44 lines
1.1 KiB
C
44 lines
1.1 KiB
C
/*
|
|
* arch/arm/include/asm/map.h
|
|
*
|
|
* Copyright (C) 1999-2000 Russell King
|
|
*
|
|
* 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.
|
|
*
|
|
* Page table mapping constructs and function prototypes
|
|
*/
|
|
#include <asm/io.h>
|
|
|
|
struct map_desc {
|
|
unsigned long virtual;
|
|
unsigned long pfn;
|
|
unsigned long length;
|
|
unsigned int type;
|
|
};
|
|
|
|
/* types 0-3 are defined in asm/io.h */
|
|
#define MT_UNCACHED 4
|
|
#define MT_CACHECLEAN 5
|
|
#define MT_MINICLEAN 6
|
|
#define MT_LOW_VECTORS 7
|
|
#define MT_HIGH_VECTORS 8
|
|
#define MT_MEMORY 9
|
|
#define MT_ROM 10
|
|
#define MT_MEMORY_NONCACHED 11
|
|
|
|
#ifdef CONFIG_MMU
|
|
extern void iotable_init(struct map_desc *, int);
|
|
|
|
struct mem_type;
|
|
extern const struct mem_type *get_mem_type(unsigned int type);
|
|
/*
|
|
* external interface to remap single page with appropriate type
|
|
*/
|
|
extern int ioremap_page(unsigned long virt, unsigned long phys,
|
|
const struct mem_type *mtype);
|
|
#else
|
|
#define iotable_init(map,num) do { } while (0)
|
|
#endif
|