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authorLennert Buytenhek <buytenh@wantstofly.org>2006-04-01 18:07:39 -0500
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-04-01 18:07:39 -0500
commit23759dc6430428897a36c4d493f611eca55c9481 (patch)
treec62050927599b36ed223753c35fd737e3c0c6762 /include/asm-arm/pgtable-hwdef.h
parentd3f4c571b6e596f9d39c596426269006a309d3b8 (diff)
[ARM] 3439/2: xsc3: add I/O coherency support
Patch from Lennert Buytenhek This patch adds support for the I/O coherent cache available on the xsc3. The approach is to provide a simple API to determine whether the chipset supports coherency by calling arch_is_coherent() and then setting the appropriate system memory PTE and PMD bits. In addition, we call this API on dma_alloc_coherent() and dma_map_single() calls. A generic version exists that will compile out all the coherency-related code that is not needed on the majority of ARM systems. Note that we do not check for coherency in the dma_alloc_writecombine() function as that still requires a special PTE setting. We also don't touch dma_mmap_coherent() as that is a special ARM-only API that is by definition only used on non-coherent system. Signed-off-by: Deepak Saxena <dsaxena@plexity.net> Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'include/asm-arm/pgtable-hwdef.h')
-rw-r--r--include/asm-arm/pgtable-hwdef.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/asm-arm/pgtable-hwdef.h b/include/asm-arm/pgtable-hwdef.h
index 1d033495cc75..1bc1f997bda2 100644
--- a/include/asm-arm/pgtable-hwdef.h
+++ b/include/asm-arm/pgtable-hwdef.h
@@ -73,6 +73,7 @@
73#define PTE_EXT_AP_URW_SRW (PTE_EXT_AP1|PTE_EXT_AP0) 73#define PTE_EXT_AP_URW_SRW (PTE_EXT_AP1|PTE_EXT_AP0)
74#define PTE_EXT_TEX(x) ((x) << 6) /* v5 */ 74#define PTE_EXT_TEX(x) ((x) << 6) /* v5 */
75#define PTE_EXT_APX (1 << 9) /* v6 */ 75#define PTE_EXT_APX (1 << 9) /* v6 */
76#define PTE_EXT_COHERENT (1 << 9) /* XScale3 */
76#define PTE_EXT_SHARED (1 << 10) /* v6 */ 77#define PTE_EXT_SHARED (1 << 10) /* v6 */
77#define PTE_EXT_NG (1 << 11) /* v6 */ 78#define PTE_EXT_NG (1 << 11) /* v6 */
78 79