diff options
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/include/asm/io.h | 5 | ||||
| -rw-r--r-- | arch/arm/include/asm/mach/map.h | 14 | ||||
| -rw-r--r-- | arch/arm/mm/mmu.c | 20 |
3 files changed, 31 insertions, 8 deletions
diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h index 94a95d7fafd6..71934856fc22 100644 --- a/arch/arm/include/asm/io.h +++ b/arch/arm/include/asm/io.h @@ -61,8 +61,9 @@ extern void __raw_readsl(const void __iomem *addr, void *data, int longlen); #define MT_DEVICE_NONSHARED 1 #define MT_DEVICE_CACHED 2 #define MT_DEVICE_IXP2000 3 +#define MT_DEVICE_WC 4 /* - * types 4 onwards can be found in asm/mach/map.h and are undefined + * types 5 onwards can be found in asm/mach/map.h and are undefined * for ioremap */ @@ -215,11 +216,13 @@ extern void _memset_io(volatile void __iomem *, int, size_t); #define ioremap(cookie,size) __arm_ioremap(cookie, size, MT_DEVICE) #define ioremap_nocache(cookie,size) __arm_ioremap(cookie, size, MT_DEVICE) #define ioremap_cached(cookie,size) __arm_ioremap(cookie, size, MT_DEVICE_CACHED) +#define ioremap_wc(cookie,size) __arm_ioremap(cookie, size, MT_DEVICE_WC) #define iounmap(cookie) __iounmap(cookie) #else #define ioremap(cookie,size) __arch_ioremap((cookie), (size), MT_DEVICE) #define ioremap_nocache(cookie,size) __arch_ioremap((cookie), (size), MT_DEVICE) #define ioremap_cached(cookie,size) __arch_ioremap((cookie), (size), MT_DEVICE_CACHED) +#define ioremap_wc(cookie,size) __arch_ioremap((cookie), (size), MT_DEVICE_WC) #define iounmap(cookie) __arch_iounmap(cookie) #endif diff --git a/arch/arm/include/asm/mach/map.h b/arch/arm/include/asm/mach/map.h index 06f583b13999..9eb936e49cc3 100644 --- a/arch/arm/include/asm/mach/map.h +++ b/arch/arm/include/asm/mach/map.h @@ -18,13 +18,13 @@ struct map_desc { unsigned int type; }; -/* types 0-3 are defined in asm/io.h */ -#define MT_CACHECLEAN 4 -#define MT_MINICLEAN 5 -#define MT_LOW_VECTORS 6 -#define MT_HIGH_VECTORS 7 -#define MT_MEMORY 8 -#define MT_ROM 9 +/* types 0-4 are defined in asm/io.h */ +#define MT_CACHECLEAN 5 +#define MT_MINICLEAN 6 +#define MT_LOW_VECTORS 7 +#define MT_HIGH_VECTORS 8 +#define MT_MEMORY 9 +#define MT_ROM 10 #define MT_NONSHARED_DEVICE MT_DEVICE_NONSHARED #define MT_IXP2000_DEVICE MT_DEVICE_IXP2000 diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c index 25d9a11eb617..a713e40e1f1a 100644 --- a/arch/arm/mm/mmu.c +++ b/arch/arm/mm/mmu.c @@ -211,6 +211,12 @@ static struct mem_type mem_types[] = { PMD_SECT_TEX(1), .domain = DOMAIN_IO, }, + [MT_DEVICE_WC] = { /* ioremap_wc */ + .prot_pte = PROT_PTE_DEVICE, + .prot_l1 = PMD_TYPE_TABLE, + .prot_sect = PROT_SECT_DEVICE, + .domain = DOMAIN_IO, + }, [MT_CACHECLEAN] = { .prot_sect = PMD_TYPE_SECT | PMD_SECT_XN, .domain = DOMAIN_KERNEL, @@ -273,6 +279,20 @@ static void __init build_mem_type_table(void) } /* + * On non-Xscale3 ARMv5-and-older systems, use CB=01 + * (Uncached/Buffered) for ioremap_wc() mappings. On XScale3 + * and ARMv6+, use TEXCB=00100 mappings (Inner/Outer Uncacheable + * in xsc3 parlance, Uncached Normal in ARMv6 parlance). + */ + if (cpu_is_xsc3() || cpu_arch >= CPU_ARCH_ARMv6) { + mem_types[MT_DEVICE_WC].prot_pte_ext |= PTE_EXT_TEX(1); + mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_TEX(1); + } else { + mem_types[MT_DEVICE_WC].prot_pte |= L_PTE_BUFFERABLE; + mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_BUFFERABLE; + } + + /* * ARMv5 and lower, bit 4 must be set for page tables. * (was: cache "update-able on write" bit on ARM610) * However, Xscale cores require this bit to be cleared. |