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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
/*
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* arch/arm/include/asm/map.h
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*
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* Copyright (C) 1999-2000 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Page table mapping constructs and function prototypes
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*/
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#include <asm/io.h>
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struct map_desc {
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unsigned long virtual;
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unsigned long pfn;
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unsigned long length;
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unsigned int type;
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};
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/* types 0-3 are defined in asm/io.h */
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#define MT_UNCACHED 4
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#define MT_CACHECLEAN 5
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#define MT_MINICLEAN 6
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#define MT_LOW_VECTORS 7
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#define MT_HIGH_VECTORS 8
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#define MT_MEMORY 9
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#define MT_ROM 10
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#define MT_MEMORY_NONCACHED 11
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#ifdef CONFIG_MMU
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extern void iotable_init(struct map_desc *, int);
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struct mem_type;
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extern const struct mem_type *get_mem_type(unsigned int type);
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/*
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* external interface to remap single page with appropriate type
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*/
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extern int ioremap_page(unsigned long virt, unsigned long phys,
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const struct mem_type *mtype);
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#else
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#define iotable_init(map,num) do { } while (0)
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#endif
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