[ARM] 5241/1: provide ioremap_wc()

[linux-2.6-omap-h63xx.git] / arch / arm / mm / mmu.c

diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 25d9a11eb61750ade3ba77abd7771068ebe668ee..a713e40e1f1a718549f333327c0f1a234e38a12c 100644 (file)
--- 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,
@@ -272,6 +278,20 @@ static void __init build_mem_type_table(void)
                ecc_mask = 0;
        }
 
+       /*
+        * 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)