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msm: iommu: Don't read from write-only registers 

Don't read from V2Pxx command registers when doing
iova-to-phys operations. These registers are write-only and
reading the value before modifying the VA bits is
unnecessary.

Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
Signed-off-by: David Brown <davidb@codeaurora.org>
This commit is contained in:
Stepan Moskovchenko 2011-02-28 16:04:55 -08:00 committed by David Brown
parent a43d8c101e
commit b0e7808d54
2 changed files with 1 additions and 29 deletions
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28
arch/arm/mach-msm/include/mach/iommu_hw-8xxx.h
View File

@ -625,20 +625,6 @@ do { \
#define SET_INDEX(b, c, v) SET_CONTEXT_FIELD(b, c, V2PSR, INDEX, v)
/* V2Pxx UW UR PW PR */
#define SET_V2PUW_INDEX(b, c, v) SET_CONTEXT_FIELD(b, c, V2PUW, V2Pxx_INDEX, v)
#define SET_V2PUW_VA(b, c, v) SET_CONTEXT_FIELD(b, c, V2PUW, V2Pxx_VA, v)
#define SET_V2PUR_INDEX(b, c, v) SET_CONTEXT_FIELD(b, c, V2PUR, V2Pxx_INDEX, v)
#define SET_V2PUR_VA(b, c, v) SET_CONTEXT_FIELD(b, c, V2PUR, V2Pxx_VA, v)
#define SET_V2PPW_INDEX(b, c, v) SET_CONTEXT_FIELD(b, c, V2PPW, V2Pxx_INDEX, v)
#define SET_V2PPW_VA(b, c, v) SET_CONTEXT_FIELD(b, c, V2PPW, V2Pxx_VA, v)
#define SET_V2PPR_INDEX(b, c, v) SET_CONTEXT_FIELD(b, c, V2PPR, V2Pxx_INDEX, v)
#define SET_V2PPR_VA(b, c, v) SET_CONTEXT_FIELD(b, c, V2PPR, V2Pxx_VA, v)
/* Context Register getters */
/* ACTLR */
#define GET_CFERE(b, c) GET_CONTEXT_FIELD(b, c, ACTLR, CFERE)
@ -826,20 +812,6 @@ do { \
#define GET_INDEX(b, c) GET_CONTEXT_FIELD(b, c, V2PSR, INDEX)
/* V2Pxx UW UR PW PR */
#define GET_V2PUW_INDEX(b, c) GET_CONTEXT_FIELD(b, c, V2PUW, V2Pxx_INDEX)
#define GET_V2PUW_VA(b, c) GET_CONTEXT_FIELD(b, c, V2PUW, V2Pxx_VA)
#define GET_V2PUR_INDEX(b, c) GET_CONTEXT_FIELD(b, c, V2PUR, V2Pxx_INDEX)
#define GET_V2PUR_VA(b, c) GET_CONTEXT_FIELD(b, c, V2PUR, V2Pxx_VA)
#define GET_V2PPW_INDEX(b, c) GET_CONTEXT_FIELD(b, c, V2PPW, V2Pxx_INDEX)
#define GET_V2PPW_VA(b, c) GET_CONTEXT_FIELD(b, c, V2PPW, V2Pxx_VA)
#define GET_V2PPR_INDEX(b, c) GET_CONTEXT_FIELD(b, c, V2PPR, V2Pxx_INDEX)
#define GET_V2PPR_VA(b, c) GET_CONTEXT_FIELD(b, c, V2PPR, V2Pxx_VA)
/* Global Registers */
#define M2VCBR_N (0xFF000)
#define CBACR_N (0xFF800)

2
arch/arm/mach-msm/iommu.c
View File

@ -579,7 +579,7 @@ static phys_addr_t msm_iommu_iova_to_phys(struct iommu_domain *domain,
/* Invalidate context TLB */
SET_CTX_TLBIALL(base, ctx, 0);
SET_V2PPR_VA(base, ctx, va >> V2Pxx_VA_SHIFT);
SET_V2PPR(base, ctx, va & V2Pxx_VA);
par = GET_PAR(base, ctx);