ARM: 6222/1: add memory types for the TCMs

The earlier TCM memory regions were mapped as MT_MEMORY_UNCACHED which doesn't really work on platforms supporting the new v6 features like the NX bit. Add unique MT_MEMORY_[I|D]TCM types instead. Cc: Nicolas Pitre <nico@fluxnic.net> Signed-off-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
git-mirror · Jul 18, 2010 · cb9d770 · cb9d770
1 parent f159f4e
commit cb9d770
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Showing 3 changed files with 17 additions and 3 deletions.
diff --git a/arch/arm/include/asm/mach/map.h b/arch/arm/include/asm/mach/map.h
@@ -27,6 +27,8 @@ struct map_desc {
 #define MT_MEMORY		9
 #define MT_ROM			10
 #define MT_MEMORY_NONCACHED	11
+#define MT_MEMORY_DTCM		12
+#define MT_MEMORY_ITCM		13
 
 #ifdef CONFIG_MMU
 extern void iotable_init(struct map_desc *, int);

diff --git a/arch/arm/kernel/tcm.c b/arch/arm/kernel/tcm.c
@@ -13,7 +13,6 @@
 #include <linux/ioport.h>
 #include <linux/genalloc.h>
 #include <linux/string.h> /* memcpy */
-#include <asm/page.h> /* PAGE_SHIFT */
 #include <asm/cputype.h>
 #include <asm/mach/map.h>
 #include <mach/memory.h>
@@ -53,7 +52,7 @@ static struct map_desc dtcm_iomap[] __initdata = {
 		.virtual	= DTCM_OFFSET,
 		.pfn		= __phys_to_pfn(DTCM_OFFSET),
 		.length		= (DTCM_END - DTCM_OFFSET + 1),
-		.type		= MT_UNCACHED
+		.type		= MT_MEMORY_DTCM
 	}
 };
 
@@ -62,7 +61,7 @@ static struct map_desc itcm_iomap[] __initdata = {
 		.virtual	= ITCM_OFFSET,
 		.pfn		= __phys_to_pfn(ITCM_OFFSET),
 		.length		= (ITCM_END - ITCM_OFFSET + 1),
-		.type		= MT_UNCACHED
+		.type		= MT_MEMORY_ITCM
 	}
 };
 

diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
@@ -258,6 +258,19 @@ static struct mem_type mem_types[] = {
 		.prot_sect = PMD_TYPE_SECT | PMD_SECT_AP_WRITE,
 		.domain    = DOMAIN_KERNEL,
 	},
+	[MT_MEMORY_DTCM] = {
+		.prot_pte	= L_PTE_PRESENT | L_PTE_YOUNG |
+		                  L_PTE_DIRTY | L_PTE_WRITE,
+		.prot_l1	= PMD_TYPE_TABLE,
+		.prot_sect	= PMD_TYPE_SECT | PMD_SECT_XN,
+		.domain		= DOMAIN_KERNEL,
+	},
+	[MT_MEMORY_ITCM] = {
+		.prot_pte  = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY |
+				L_PTE_USER | L_PTE_EXEC,
+		.prot_l1   = PMD_TYPE_TABLE,
+		.domain    = DOMAIN_IO,
+	},
 };
 
 const struct mem_type *get_mem_type(unsigned int type)