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Subject[PATCH 1/2] dma: define barrierless versions of map and unmap area
Date
From: Abhijeet Dharmapurikar <adharmap@quicinc.com>

Barrierless versions of dma_map_area and dma_unmap_area will be used in
the scatter-gather mapping and unmapping functions.

Signed-off-by: Abhijeet Dharmapurikar <adharmap@quicinc.com>
---
arch/arm/include/asm/cacheflush.h | 9 +++
arch/arm/mm/cache-v3.S | 6 ++
arch/arm/mm/cache-v4.S | 6 ++
arch/arm/mm/cache-v4wb.S | 94 +++++++++++++++++--------
arch/arm/mm/cache-v4wt.S | 6 ++
arch/arm/mm/cache-v6.S | 139 ++++++++++++++++++++++++++-----------
arch/arm/mm/cache-v7.S | 120 ++++++++++++++++++++++++--------
7 files changed, 283 insertions(+), 97 deletions(-)

diff --git a/arch/arm/include/asm/cacheflush.h b/arch/arm/include/asm/cacheflush.h
index 8148a00..e91e014 100644
--- a/arch/arm/include/asm/cacheflush.h
+++ b/arch/arm/include/asm/cacheflush.h
@@ -215,6 +215,9 @@ struct cpu_cache_fns {
void (*dma_map_area)(const void *, size_t, int);
void (*dma_unmap_area)(const void *, size_t, int);

+ void (*dma_map_area_nobarrier)(const void *, size_t, int);
+ void (*dma_unmap_area_nobarrier)(const void *, size_t, int);
+
void (*dma_flush_range)(const void *, const void *);
};

@@ -246,6 +249,8 @@ extern struct cpu_cache_fns cpu_cache;
*/
#define dmac_map_area cpu_cache.dma_map_area
#define dmac_unmap_area cpu_cache.dma_unmap_area
+#define dmac_map_area_nobarrier cpu_cache.dma_map_area_nobarrier
+#define dmac_unmap_area_nobarrier cpu_cache.dma_unmap_area_nobarrier
#define dmac_flush_range cpu_cache.dma_flush_range

#else
@@ -272,10 +277,14 @@ extern void __cpuc_flush_dcache_area(void *, size_t);
*/
#define dmac_map_area __glue(_CACHE,_dma_map_area)
#define dmac_unmap_area __glue(_CACHE,_dma_unmap_area)
+#define dmac_map_area_nobarrier __glue(_CACHE,_dma_map_area_nobarrier)
+#define dmac_unmap_area_nobarrier __glue(_CACHE,_dma_unmap_area_nobarrier)
#define dmac_flush_range __glue(_CACHE,_dma_flush_range)

extern void dmac_map_area(const void *, size_t, int);
extern void dmac_unmap_area(const void *, size_t, int);
+extern void dmac_map_area_nobarrier(const void *, size_t, int);
+extern void dmac_unmap_area_nobarrier(const void *, size_t, int);
extern void dmac_flush_range(const void *, const void *);

#endif
diff --git a/arch/arm/mm/cache-v3.S b/arch/arm/mm/cache-v3.S
index c2ff3c5..5ba5b9b 100644
--- a/arch/arm/mm/cache-v3.S
+++ b/arch/arm/mm/cache-v3.S
@@ -103,6 +103,7 @@ ENTRY(v3_dma_flush_range)
* - dir - DMA direction
*/
ENTRY(v3_dma_unmap_area)
+ENTRY(v3_dma_unmap_area_nobarrier)
teq r2, #DMA_TO_DEVICE
bne v3_dma_flush_range
/* FALLTHROUGH */
@@ -114,9 +115,12 @@ ENTRY(v3_dma_unmap_area)
* - dir - DMA direction
*/
ENTRY(v3_dma_map_area)
+ENTRY(v3_dma_map_area_nobarrier)
mov pc, lr
ENDPROC(v3_dma_unmap_area)
+ENDPROC(v3_dma_unmap_area_nobarrier)
ENDPROC(v3_dma_map_area)
+ENDPROC(v3_dma_map_area_nobarrier)

__INITDATA

@@ -130,5 +134,7 @@ ENTRY(v3_cache_fns)
.long v3_flush_kern_dcache_area
.long v3_dma_map_area
.long v3_dma_unmap_area
+ .long v3_dma_map_area_nobarrier
+ .long v3_dma_unmap_area_nobarrier
.long v3_dma_flush_range
.size v3_cache_fns, . - v3_cache_fns
diff --git a/arch/arm/mm/cache-v4.S b/arch/arm/mm/cache-v4.S
index 4810f7e..a914c5f 100644
--- a/arch/arm/mm/cache-v4.S
+++ b/arch/arm/mm/cache-v4.S
@@ -115,6 +115,7 @@ ENTRY(v4_dma_flush_range)
* - dir - DMA direction
*/
ENTRY(v4_dma_unmap_area)
+ENTRY(v4_dma_unmap_area_nobarrier)
teq r2, #DMA_TO_DEVICE
bne v4_dma_flush_range
/* FALLTHROUGH */
@@ -126,9 +127,12 @@ ENTRY(v4_dma_unmap_area)
* - dir - DMA direction
*/
ENTRY(v4_dma_map_area)
+ENTRY(v4_dma_map_area_nobarrier)
mov pc, lr
ENDPROC(v4_dma_unmap_area)
+ENDPROC(v4_dma_unmap_area_nobarrier)
ENDPROC(v4_dma_map_area)
+ENDPROC(v4_dma_map_area_nobarrier)

__INITDATA

@@ -142,5 +146,7 @@ ENTRY(v4_cache_fns)
.long v4_flush_kern_dcache_area
.long v4_dma_map_area
.long v4_dma_unmap_area
+ .long v4_dma_map_area_nobarrier
+ .long v4_dma_unmap_area_nobarrier
.long v4_dma_flush_range
.size v4_cache_fns, . - v4_cache_fns
diff --git a/arch/arm/mm/cache-v4wb.S b/arch/arm/mm/cache-v4wb.S
index df8368a..dff8248 100644
--- a/arch/arm/mm/cache-v4wb.S
+++ b/arch/arm/mm/cache-v4wb.S
@@ -113,6 +113,37 @@ ENTRY(v4wb_flush_user_cache_range)
mcrne p15, 0, ip, c7, c10, 4 @ drain write buffer
mov pc, lr

+ .macro v4wb_dma_flush_range_macro, start, end
+ bic \start, \start, #CACHE_DLINESIZE - 1
+1: mcr p15, 0, \start, c7, c10, 1 @ clean D entry
+ mcr p15, 0, \start, c7, c6, 1 @ invalidate D entry
+ add \start, \start, #CACHE_DLINESIZE
+ cmp \start, \end
+ blo 1b
+ mov ip, #0
+ mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
+ .endm
+
+ .macro v4wb_dma_inv_range, start, end
+ tst \start, #CACHE_DLINESIZE - 1
+ bic \start, \start, #CACHE_DLINESIZE - 1
+ mcrne p15, 0, \start, c7, c10, 1 @ clean D entry
+ tst \end, #CACHE_DLINESIZE - 1
+ mcrne p15, 0, \end, c7, c10, 1 @ clean D entry
+1: mcr p15, 0, \start, c7, c6, 1 @ invalidate D entry
+ add \start, \start, #CACHE_DLINESIZE
+ cmp \start, \end
+ blo 1b
+ .endm
+
+ .macro v4wb_dma_clean_range, start, end
+ bic \start, \start, #CACHE_DLINESIZE - 1
+1: mcr p15, 0, \start, c7, c10, 1 @ clean D entry
+ add \start, \start, #CACHE_DLINESIZE
+ cmp \start, \end
+ blo 1b
+ .endm
+
/*
* flush_kern_dcache_area(void *addr, size_t size)
*
@@ -150,20 +181,12 @@ ENTRY(v4wb_coherent_kern_range)
* - end - virtual end address
*/
ENTRY(v4wb_coherent_user_range)
- bic r0, r0, #CACHE_DLINESIZE - 1
-1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
- mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
- add r0, r0, #CACHE_DLINESIZE
- cmp r0, r1
- blo 1b
- mov ip, #0
- mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
+ v4wb_dma_flush_range_macro r0, r1
mcr p15, 0, ip, c7, c10, 4 @ drain WB
mov pc, lr

-
/*
- * dma_inv_range(start, end)
+ * dma_inv_range_barrier(start, end)
*
* Invalidate (discard) the specified virtual address range.
* May not write back any entries. If 'start' or 'end'
@@ -173,16 +196,8 @@ ENTRY(v4wb_coherent_user_range)
* - start - virtual start address
* - end - virtual end address
*/
-v4wb_dma_inv_range:
- tst r0, #CACHE_DLINESIZE - 1
- bic r0, r0, #CACHE_DLINESIZE - 1
- mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
- tst r1, #CACHE_DLINESIZE - 1
- mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
-1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
- add r0, r0, #CACHE_DLINESIZE
- cmp r0, r1
- blo 1b
+v4wb_dma_inv_range_barrier:
+ v4wb_dma_inv_range r0, r1
mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
mov pc, lr

@@ -194,12 +209,8 @@ v4wb_dma_inv_range:
* - start - virtual start address
* - end - virtual end address
*/
-v4wb_dma_clean_range:
- bic r0, r0, #CACHE_DLINESIZE - 1
-1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
- add r0, r0, #CACHE_DLINESIZE
- cmp r0, r1
- blo 1b
+v4wb_dma_clean_range_barrier:
+ v4wb_dma_clean_range r0, r1
mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
mov pc, lr

@@ -216,17 +227,32 @@ v4wb_dma_clean_range:
.globl v4wb_dma_flush_range
.set v4wb_dma_flush_range, v4wb_coherent_kern_range

+
+v4wb_dma_inv_range_nobarrier:
+ v4wb_dma_inv_range r0, r1
+ mov pc, lr
+
+v4wb_dma_clean_range_nobarrier:
+ v4wb_dma_clean_range r0, r1
+ mov pc, lr
+
+v4wb_dma_flush_range_nobarrier:
+ v4wb_dma_flush_range_macro r0, r1
+ mov pc, lr
+
+
/*
* dma_map_area(start, size, dir)
* - start - kernel virtual start address
* - size - size of region
* - dir - DMA direction
*/
+
ENTRY(v4wb_dma_map_area)
add r1, r1, r0
cmp r2, #DMA_TO_DEVICE
- beq v4wb_dma_clean_range
- bcs v4wb_dma_inv_range
+ beq v4wb_dma_clean_range_barrier
+ bcs v4wb_dma_inv_range_barrier
b v4wb_dma_flush_range
ENDPROC(v4wb_dma_map_area)

@@ -237,8 +263,18 @@ ENDPROC(v4wb_dma_map_area)
* - dir - DMA direction
*/
ENTRY(v4wb_dma_unmap_area)
+ENTRY(v4wb_dma_unmap_area_nobarrier)
mov pc, lr
ENDPROC(v4wb_dma_unmap_area)
+ENDPROC(v4wb_dma_unmap_area_nobarrier)
+
+ENTRY(v4wb_dma_map_area_nobarrier)
+ add r1, r1, r0
+ cmp r2, #DMA_TO_DEVICE
+ beq v4wb_dma_clean_range_nobarrier
+ bcs v4wb_dma_inv_range_nobarrier
+ b v4wb_dma_flush_range_nobarrier
+ENDPROC(v4wb_dma_map_area_nobarrier)

__INITDATA

@@ -252,5 +288,7 @@ ENTRY(v4wb_cache_fns)
.long v4wb_flush_kern_dcache_area
.long v4wb_dma_map_area
.long v4wb_dma_unmap_area
+ .long v4wb_dma_map_area_nobarrier
+ .long v4wb_dma_unmap_area_nobarrier
.long v4wb_dma_flush_range
.size v4wb_cache_fns, . - v4wb_cache_fns
diff --git a/arch/arm/mm/cache-v4wt.S b/arch/arm/mm/cache-v4wt.S
index 45c7031..df587b6 100644
--- a/arch/arm/mm/cache-v4wt.S
+++ b/arch/arm/mm/cache-v4wt.S
@@ -168,6 +168,7 @@ v4wt_dma_inv_range:
* - dir - DMA direction
*/
ENTRY(v4wt_dma_unmap_area)
+ENTRY(v4wt_dma_unmap_area_nobarrier)
add r1, r1, r0
teq r2, #DMA_TO_DEVICE
bne v4wt_dma_inv_range
@@ -180,9 +181,12 @@ ENTRY(v4wt_dma_unmap_area)
* - dir - DMA direction
*/
ENTRY(v4wt_dma_map_area)
+ENTRY(v4wt_dma_map_area_nobarrier)
mov pc, lr
ENDPROC(v4wt_dma_unmap_area)
+ENDPROC(v4wt_dma_unmap_area_nobarrier)
ENDPROC(v4wt_dma_map_area)
+ENDPROC(v4wt_dma_map_area_nobarrier)

__INITDATA

@@ -196,5 +200,7 @@ ENTRY(v4wt_cache_fns)
.long v4wt_flush_kern_dcache_area
.long v4wt_dma_map_area
.long v4wt_dma_unmap_area
+ .long v4wt_dma_map_area_nobarrier
+ .long v4wt_dma_unmap_area_nobarrier
.long v4wt_dma_flush_range
.size v4wt_cache_fns, . - v4wt_cache_fns
diff --git a/arch/arm/mm/cache-v6.S b/arch/arm/mm/cache-v6.S
index 9d89c67..0e3f9b9 100644
--- a/arch/arm/mm/cache-v6.S
+++ b/arch/arm/mm/cache-v6.S
@@ -185,65 +185,96 @@ ENTRY(v6_flush_kern_dcache_area)
mov pc, lr


-/*
- * v6_dma_inv_range(start,end)
- *
- * Invalidate the data cache within the specified region; we will
- * be performing a DMA operation in this region and we want to
- * purge old data in the cache.
- *
- * - start - virtual start address of region
- * - end - virtual end address of region
- */
-v6_dma_inv_range:
- tst r0, #D_CACHE_LINE_SIZE - 1
- bic r0, r0, #D_CACHE_LINE_SIZE - 1
+ .macro v6_dma_inv_range, start,end
+ tst \start, #D_CACHE_LINE_SIZE - 1
+ bic \start, \start, #D_CACHE_LINE_SIZE - 1
#ifdef HARVARD_CACHE
- mcrne p15, 0, r0, c7, c10, 1 @ clean D line
+ mcrne p15, 0, \start, c7, c10, 1 @ clean D line
#else
- mcrne p15, 0, r0, c7, c11, 1 @ clean unified line
+ mcrne p15, 0, \start, c7, c11, 1 @ clean unified line
#endif
- tst r1, #D_CACHE_LINE_SIZE - 1
- bic r1, r1, #D_CACHE_LINE_SIZE - 1
+ tst \end, #D_CACHE_LINE_SIZE - 1
+ bic \end, \end, #D_CACHE_LINE_SIZE - 1
#ifdef HARVARD_CACHE
- mcrne p15, 0, r1, c7, c14, 1 @ clean & invalidate D line
+ mcrne p15, 0, \end, c7, c14, 1 @ clean & invalidate D line
#else
- mcrne p15, 0, r1, c7, c15, 1 @ clean & invalidate unified line
+ mcrne p15, 0, \end, c7, c15, 1 @ clean & invalidate unifiedline
#endif
1:
#ifdef HARVARD_CACHE
- mcr p15, 0, r0, c7, c6, 1 @ invalidate D line
+ mcr p15, 0, \start, c7, c6, 1 @ invalidate D line
#else
- mcr p15, 0, r0, c7, c7, 1 @ invalidate unified line
+ mcr p15, 0, \start, c7, c7, 1 @ invalidate unified line
#endif
- add r0, r0, #D_CACHE_LINE_SIZE
- cmp r0, r1
+ add \start, \start, #D_CACHE_LINE_SIZE
+ cmp \start, \end
blo 1b
- mov r0, #0
+ mov \start, #0
+ .endm
+
+ .macro v6_dma_clean_range, start, end
+ bic \start, \start, #D_CACHE_LINE_SIZE - 1
+1:
+#ifdef HARVARD_CACHE
+ mcr p15, 0, \start, c7, c10, 1 @ clean D line
+#else
+ mcr p15, 0, \start, c7, c11, 1 @ clean unified line
+#endif
+ add \start, \start, #D_CACHE_LINE_SIZE
+ cmp \start, \end
+ blo 1b
+ mov \start, #0
+ .endm
+
+/*
+ * v6_dma_inv_range_barrier(start,end)
+ *
+ * Invalidate the data cache within the specified region; we will
+ * be performing a DMA operation in this region and we want to
+ * purge old data in the cache.
+ *
+ * - start - virtual start address of region
+ * - end - virtual end address of region
+ */
+v6_dma_inv_range_barrier:
+ v6_dma_inv_range r0, r1
mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
mov pc, lr

/*
- * v6_dma_clean_range(start,end)
+ * v6_dma_clean_range_barrier(start,end)
* - start - virtual start address of region
* - end - virtual end address of region
*/
-v6_dma_clean_range:
- bic r0, r0, #D_CACHE_LINE_SIZE - 1
-1:
-#ifdef HARVARD_CACHE
- mcr p15, 0, r0, c7, c10, 1 @ clean D line
-#else
- mcr p15, 0, r0, c7, c11, 1 @ clean unified line
-#endif
- add r0, r0, #D_CACHE_LINE_SIZE
- cmp r0, r1
- blo 1b
- mov r0, #0
+v6_dma_clean_range_barrier:
+ v6_dma_clean_range r0, r1
mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
mov pc, lr

/*
+ * v6_dma_inv_range_nobarrier(start,end)
+ *
+ * Invalidate the data cache within the specified region; we will
+ * be performing a DMA operation in this region and we want to
+ * purge old data in the cache.
+ *
+ * - start - virtual start address of region
+ * - end - virtual end address of region
+ */
+v6_dma_inv_range_nobarrier:
+ v6_dma_inv_range r0, r1
+ mov pc, lr
+
+/*
+ * v6_dma_clean_range_nobarrier(start,end)
+ * - start - virtual start address of region
+ * - end - virtual end address of region
+ */
+v6_dma_clean_range_nobarrier:
+ v6_dma_clean_range r0, r1
+ mov pc, lr
+
+/*
* v6_dma_flush_range(start,end)
* - start - virtual start address of region
* - end - virtual end address of region
@@ -272,8 +303,8 @@ ENTRY(v6_dma_flush_range)
ENTRY(v6_dma_map_area)
add r1, r1, r0
teq r2, #DMA_FROM_DEVICE
- beq v6_dma_inv_range
- b v6_dma_clean_range
+ beq v6_dma_inv_range_barrier
+ b v6_dma_clean_range_barrier
ENDPROC(v6_dma_map_area)

/*
@@ -285,10 +316,36 @@ ENDPROC(v6_dma_map_area)
ENTRY(v6_dma_unmap_area)
add r1, r1, r0
teq r2, #DMA_TO_DEVICE
- bne v6_dma_inv_range
+ bne v6_dma_inv_range_barrier
mov pc, lr
ENDPROC(v6_dma_unmap_area)

+/*
+ * dma_map_area_nobarrier(start, size, dir)
+ * - start - kernel virtual start address
+ * - size - size of region
+ * - dir - DMA direction
+ */
+ENTRY(v6_dma_map_area_nobarrier)
+ add r1, r1, r0
+ teq r2, #DMA_FROM_DEVICE
+ beq v6_dma_inv_range_nobarrier
+ b v6_dma_clean_range_nobarrier
+ENDPROC(v6_dma_map_area_nobarrier)
+
+/*
+ * dma_unmap_area_nobarrier(start, size, dir)
+ * - start - kernel virtual start address
+ * - size - size of region
+ * - dir - DMA direction
+ */
+ENTRY(v6_dma_unmap_area_nobarrier)
+ add r1, r1, r0
+ teq r2, #DMA_TO_DEVICE
+ bne v6_dma_inv_range_nobarrier
+ mov pc, lr
+ENDPROC(v6_dma_unmap_area_nobarrier)
+
__INITDATA

.type v6_cache_fns, #object
@@ -301,5 +358,7 @@ ENTRY(v6_cache_fns)
.long v6_flush_kern_dcache_area
.long v6_dma_map_area
.long v6_dma_unmap_area
+ .long v6_dma_map_area_nobarrier
+ .long v6_dma_unmap_area_nobarrier
.long v6_dma_flush_range
.size v6_cache_fns, . - v6_cache_fns
diff --git a/arch/arm/mm/cache-v7.S b/arch/arm/mm/cache-v7.S
index bcd64f2..d748137 100644
--- a/arch/arm/mm/cache-v7.S
+++ b/arch/arm/mm/cache-v7.S
@@ -206,8 +206,33 @@ ENTRY(v7_flush_kern_dcache_area)
mov pc, lr
ENDPROC(v7_flush_kern_dcache_area)

+ .macro v7_dma_inv_range, start, end, line_size, tmp
+ sub \tmp, \line_size, #1
+ tst \start, \line_size
+ bic \start, \start, \tmp
+ mcrne p15, 0, \start, c7, c14, 1 @ clean & invalidate D / U line
+
+ tst \end, \tmp
+ bic \end, \end, \tmp
+ mcrne p15, 0, \end, c7, c14, 1 @ clean & invalidate D / U line
+1:
+ mcr p15, 0, \start, c7, c6, 1 @ invalidate D / U line
+ add \start, \start, \line_size
+ cmp \start, \end
+ blo 1b
+ .endm
+
+ .macro v7_dma_clean_range, start, end, line_size, tmp
+ sub \tmp, \line_size, #1
+ bic \start, \start, \tmp
+1:
+ mcr p15, 0, \start, c7, c10, 1 @ clean D / U line
+ add \start, \start, \line_size
+ cmp \start, \end
+ blo 1b
+ .endm
/*
- * v7_dma_inv_range(start,end)
+ * v7_dma_inv_range_barrier(start,end)
*
* Invalidate the data cache within the specified region; we will
* be performing a DMA operation in this region and we want to
@@ -216,42 +241,51 @@ ENDPROC(v7_flush_kern_dcache_area)
* - start - virtual start address of region
* - end - virtual end address of region
*/
-v7_dma_inv_range:
+v7_dma_inv_range_barrier:
dcache_line_size r2, r3
- sub r3, r2, #1
- tst r0, r3
- bic r0, r0, r3
- mcrne p15, 0, r0, c7, c14, 1 @ clean & invalidate D / U line
-
- tst r1, r3
- bic r1, r1, r3
- mcrne p15, 0, r1, c7, c14, 1 @ clean & invalidate D / U line
-1:
- mcr p15, 0, r0, c7, c6, 1 @ invalidate D / U line
- add r0, r0, r2
- cmp r0, r1
- blo 1b
+ v7_dma_inv_range r0, r1, r2, r3
dsb
mov pc, lr
-ENDPROC(v7_dma_inv_range)
+ENDPROC(v7_dma_inv_range_barrier)

/*
- * v7_dma_clean_range(start,end)
+ * v7_dma_clean_range_barrier(start,end)
* - start - virtual start address of region
* - end - virtual end address of region
*/
-v7_dma_clean_range:
+v7_dma_clean_range_barrier:
dcache_line_size r2, r3
- sub r3, r2, #1
- bic r0, r0, r3
-1:
- mcr p15, 0, r0, c7, c10, 1 @ clean D / U line
- add r0, r0, r2
- cmp r0, r1
- blo 1b
+ v7_dma_clean_range r0, r1, r2 ,r3
dsb
mov pc, lr
-ENDPROC(v7_dma_clean_range)
+ENDPROC(v7_dma_clean_range_barrier)
+
+/*
+ * v7_dma_inv_range_nobarrier(start,end)
+ *
+ * Invalidate the data cache within the specified region; we will
+ * be performing a DMA operation in this region and we want to
+ * purge old data in the cache.
+ *
+ * - start - virtual start address of region
+ * - end - virtual end address of region
+ */
+v7_dma_inv_range_nobarrier:
+ dcache_line_size r2, r3
+ v7_dma_inv_range r0, r1, r2, r3
+ mov pc, lr
+ENDPROC(v7_dma_inv_range_nobarrier)
+
+/*
+ * v7_dma_clean_range_nobarrier(start,end)
+ * - start - virtual start address of region
+ * - end - virtual end address of region
+ */
+v7_dma_clean_range_nobarrier:
+ dcache_line_size r2, r3
+ v7_dma_clean_range r0, r1, r2 ,r3
+ mov pc, lr
+ENDPROC(v7_dma_clean_range_nobarrier)

/*
* v7_dma_flush_range(start,end)
@@ -280,8 +314,8 @@ ENDPROC(v7_dma_flush_range)
ENTRY(v7_dma_map_area)
add r1, r1, r0
teq r2, #DMA_FROM_DEVICE
- beq v7_dma_inv_range
- b v7_dma_clean_range
+ beq v7_dma_inv_range_barrier
+ b v7_dma_clean_range_barrier
ENDPROC(v7_dma_map_area)

/*
@@ -293,10 +327,36 @@ ENDPROC(v7_dma_map_area)
ENTRY(v7_dma_unmap_area)
add r1, r1, r0
teq r2, #DMA_TO_DEVICE
- bne v7_dma_inv_range
+ bne v7_dma_inv_range_barrier
mov pc, lr
ENDPROC(v7_dma_unmap_area)

+/*
+ * dma_map_area_nobarrier(start, size, dir)
+ * - start - kernel virtual start address
+ * - size - size of region
+ * - dir - DMA direction
+ */
+ENTRY(v7_dma_map_area_nobarrier)
+ add r1, r1, r0
+ teq r2, #DMA_FROM_DEVICE
+ beq v7_dma_inv_range_nobarrier
+ b v7_dma_clean_range_nobarrier
+ENDPROC(v7_dma_map_area_nobarrier)
+
+/*
+ * dma_unmap_area_nobarrier(start, size, dir)
+ * - start - kernel virtual start address
+ * - size - size of region
+ * - dir - DMA direction
+ */
+ENTRY(v7_dma_unmap_area_nobarrier)
+ add r1, r1, r0
+ teq r2, #DMA_TO_DEVICE
+ bne v7_dma_inv_range_nobarrier
+ mov pc, lr
+ENDPROC(v7_dma_unmap_area_nobarrier)
+
__INITDATA

.type v7_cache_fns, #object
@@ -309,5 +369,7 @@ ENTRY(v7_cache_fns)
.long v7_flush_kern_dcache_area
.long v7_dma_map_area
.long v7_dma_unmap_area
+ .long v7_dma_map_area_nobarrier
+ .long v7_dma_unmap_area_nobarrier
.long v7_dma_flush_range
.size v7_cache_fns, . - v7_cache_fns
--
1.5.6.3


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