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ARM: dma: replace ISA_DMA_THRESHOLD with a variable

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ISA_DMA_THRESHOLD has been unused by non-arch code, so lets now get
rid of it from ARM by replacing it with arm_dma_zone_mask.  Move
dma_supported() and dma_set_mask() out of line, and have
dma_supported() check this new variable instead.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
2011-07-08 21:26:59 +01:00
parent 3973c33775
commit 022ae537b2
5 changed files with 50 additions and 42 deletions
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12
arch/arm/include/asm/memory.h
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@@ -203,18 +203,6 @@ static inline unsigned long __phys_to_virt(unsigned long x)
#define PHYS_OFFSET PLAT_PHYS_OFFSET
#endif
/*
* The DMA mask corresponding to the maximum bus address allocatable
* using GFP_DMA. The default here places no restriction on DMA
* allocations. This must be the smallest DMA mask in the system,
* so a successful GFP_DMA allocation will always satisfy this.
*/
#ifndef ARM_DMA_ZONE_SIZE
#define ISA_DMA_THRESHOLD (0xffffffffULL)
#else
#define ISA_DMA_THRESHOLD (PHYS_OFFSET + ARM_DMA_ZONE_SIZE - 1)
#endif
/*
* PFNs are used to describe any physical page; this means
* PFN 0 == physical address 0.