From 8fb54284ba6aa1f0d832ec015fde64ecf4bb0f4f Mon Sep 17 00:00:00 2001 From: Santosh Shilimkar Date: Tue, 28 Jun 2011 12:42:56 -0700 Subject: [PATCH] ARM: mm: Add strongly ordered descriptor support. On certain architectures, there might be a need to mark certain addresses with strongly ordered memory attributes to avoid ordering issues at the interconnect level. On OMAP4, the asynchronous bridge buffers can only be drained with strongly ordered accesses and hence the need to mark the memory strongly ordered. Signed-off-by: Santosh Shilimkar Signed-off-by: Woodruff Richard Tested-by: Vishwanath BS --- arch/arm/include/asm/mach/map.h | 1 + arch/arm/include/asm/pgtable.h | 3 +++ arch/arm/mm/mmu.c | 8 ++++++++ 3 files changed, 12 insertions(+) diff --git a/arch/arm/include/asm/mach/map.h b/arch/arm/include/asm/mach/map.h index d2fedb5aeb1f..b36f3654bf54 100644 --- a/arch/arm/include/asm/mach/map.h +++ b/arch/arm/include/asm/mach/map.h @@ -29,6 +29,7 @@ struct map_desc { #define MT_MEMORY_NONCACHED 11 #define MT_MEMORY_DTCM 12 #define MT_MEMORY_ITCM 13 +#define MT_MEMORY_SO 14 #ifdef CONFIG_MMU extern void iotable_init(struct map_desc *, int); diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h index 5750704e0271..f1956b27ae5a 100644 --- a/arch/arm/include/asm/pgtable.h +++ b/arch/arm/include/asm/pgtable.h @@ -232,6 +232,9 @@ extern pgprot_t pgprot_kernel; #define pgprot_writecombine(prot) \ __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_BUFFERABLE) +#define pgprot_stronglyordered(prot) \ + __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_UNCACHED) + #ifdef CONFIG_ARM_DMA_MEM_BUFFERABLE #define pgprot_dmacoherent(prot) \ __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_BUFFERABLE | L_PTE_XN) diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c index 594d677b92c8..ea9c9f3e48bf 100644 --- a/arch/arm/mm/mmu.c +++ b/arch/arm/mm/mmu.c @@ -273,6 +273,14 @@ static struct mem_type mem_types[] = { .prot_l1 = PMD_TYPE_TABLE, .domain = DOMAIN_KERNEL, }, + [MT_MEMORY_SO] = { + .prot_pte = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY | + L_PTE_MT_UNCACHED, + .prot_l1 = PMD_TYPE_TABLE, + .prot_sect = PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_SECT_S | + PMD_SECT_UNCACHED | PMD_SECT_XN, + .domain = DOMAIN_KERNEL, + }, }; const struct mem_type *get_mem_type(unsigned int type)