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iommu: Add DMA window parser, of_get_dma_window()

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This code was based on:
    "arch/microblaze/kernel/prom_parse.c"
    "arch/powerpc/kernel/prom_parse.c"

Can replace "of_parse_dma_window()" in the above. This supports
different formats flexibly. "prefix" can be configured if any. "busno"
and "index" are optionally specified. Set NULL and 0 if not used.

Signed-off-by: Hiroshi DOYU <hdoyu@nvidia.com>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Hiroshi Doyu
2012-06-25 14:23:54 +03:00
committed by Joerg Roedel
parent 485802a6c5
commit 4e0ee78f2a
4 changed files with 116 additions and 0 deletions
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21
include/linux/of_iommu.h Normal file
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@@ -0,0 +1,21 @@
#ifndef __OF_IOMMU_H
#define __OF_IOMMU_H
#ifdef CONFIG_OF_IOMMU
extern int of_get_dma_window(struct device_node *dn, const char *prefix,
int index, unsigned long *busno, dma_addr_t *addr,
size_t *size);
#else
static inline int of_get_dma_window(struct device_node *dn, const char *prefix,
int index, unsigned long *busno, dma_addr_t *addr,
size_t *size)
{
return -EINVAL;
}
#endif /* CONFIG_OF_IOMMU */
#endif /* __OF_IOMMU_H */