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author | Hiroshi DOYU <Hiroshi.DOYU@nokia.com> | 2009-01-28 21:32:08 +0200 |
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committer | Hiroshi DOYU <Hiroshi.DOYU@nokia.com> | 2009-05-19 08:23:49 +0300 |
commit | 69d3a84a646d6ad6cd693a7a3d5b9af414113d2c (patch) | |
tree | 3fe2ec29cc83ff07ae0d07df6b51c52a59a3944e /arch/arm/mm/ioremap.c | |
parent | 066aa9c1e3d0af52619fe26f05810990ff381d8c (diff) | |
download | linux-stable-69d3a84a646d6ad6cd693a7a3d5b9af414113d2c.tar.gz linux-stable-69d3a84a646d6ad6cd693a7a3d5b9af414113d2c.tar.bz2 linux-stable-69d3a84a646d6ad6cd693a7a3d5b9af414113d2c.zip |
omap iommu: simple virtual address space management
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>
Diffstat (limited to 'arch/arm/mm/ioremap.c')
-rw-r--r-- | arch/arm/mm/ioremap.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm/mm/ioremap.c b/arch/arm/mm/ioremap.c index 9f88dd3be601..0ab75c60f7cf 100644 --- a/arch/arm/mm/ioremap.c +++ b/arch/arm/mm/ioremap.c @@ -110,6 +110,12 @@ static int remap_area_pages(unsigned long start, unsigned long pfn, return err; } +int ioremap_page(unsigned long virt, unsigned long phys, + const struct mem_type *mtype) +{ + return remap_area_pages(virt, __phys_to_pfn(phys), PAGE_SIZE, mtype); +} +EXPORT_SYMBOL(ioremap_page); void __check_kvm_seq(struct mm_struct *mm) { |