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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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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>
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|---|---|---|
| .. | ||
| arch.h | ||
| dma.h | ||
| flash.h | ||
| irda.h | ||
| irq.h | ||
| map.h | ||
| mmc.h | ||
| pci.h | ||
| serial_at91.h | ||
| serial_sa1100.h | ||
| sharpsl_param.h | ||
| time.h | ||
| udc_pxa2xx.h | ||