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Diffstat (limited to 'arch/arm/mm/mmu.c')
-rw-r--r--arch/arm/mm/mmu.c92
1 files changed, 66 insertions, 26 deletions
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index e95a996ab78f..e0d8565671a6 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -34,6 +34,7 @@
#include <asm/mach/pci.h>
#include "mm.h"
+#include "tcm.h"
/*
* empty_zero_page is a special page that is used for
@@ -112,6 +113,7 @@ static struct cachepolicy cache_policies[] __initdata = {
}
};
+#ifdef CONFIG_CPU_CP15
/*
* These are useful for identifying cache coherency
* problems by allowing the cache or the cache and
@@ -210,6 +212,22 @@ void adjust_cr(unsigned long mask, unsigned long set)
}
#endif
+#else /* ifdef CONFIG_CPU_CP15 */
+
+static int __init early_cachepolicy(char *p)
+{
+ pr_warning("cachepolicy kernel parameter not supported without cp15\n");
+}
+early_param("cachepolicy", early_cachepolicy);
+
+static int __init noalign_setup(char *__unused)
+{
+ pr_warning("noalign kernel parameter not supported without cp15\n");
+}
+__setup("noalign", noalign_setup);
+
+#endif /* ifdef CONFIG_CPU_CP15 / else */
+
#define PROT_PTE_DEVICE L_PTE_PRESENT|L_PTE_YOUNG|L_PTE_DIRTY|L_PTE_XN
#define PROT_SECT_DEVICE PMD_TYPE_SECT|PMD_SECT_AP_WRITE
@@ -598,39 +616,60 @@ static void __init alloc_init_pte(pmd_t *pmd, unsigned long addr,
} while (pte++, addr += PAGE_SIZE, addr != end);
}
-static void __init alloc_init_section(pud_t *pud, unsigned long addr,
- unsigned long end, phys_addr_t phys,
- const struct mem_type *type)
+static void __init map_init_section(pmd_t *pmd, unsigned long addr,
+ unsigned long end, phys_addr_t phys,
+ const struct mem_type *type)
{
- pmd_t *pmd = pmd_offset(pud, addr);
-
+#ifndef CONFIG_ARM_LPAE
/*
- * Try a section mapping - end, addr and phys must all be aligned
- * to a section boundary. Note that PMDs refer to the individual
- * L1 entries, whereas PGDs refer to a group of L1 entries making
- * up one logical pointer to an L2 table.
+ * In classic MMU format, puds and pmds are folded in to
+ * the pgds. pmd_offset gives the PGD entry. PGDs refer to a
+ * group of L1 entries making up one logical pointer to
+ * an L2 table (2MB), where as PMDs refer to the individual
+ * L1 entries (1MB). Hence increment to get the correct
+ * offset for odd 1MB sections.
+ * (See arch/arm/include/asm/pgtable-2level.h)
*/
- if (type->prot_sect && ((addr | end | phys) & ~SECTION_MASK) == 0) {
- pmd_t *p = pmd;
-
-#ifndef CONFIG_ARM_LPAE
- if (addr & SECTION_SIZE)
- pmd++;
+ if (addr & SECTION_SIZE)
+ pmd++;
#endif
+ do {
+ *pmd = __pmd(phys | type->prot_sect);
+ phys += SECTION_SIZE;
+ } while (pmd++, addr += SECTION_SIZE, addr != end);
- do {
- *pmd = __pmd(phys | type->prot_sect);
- phys += SECTION_SIZE;
- } while (pmd++, addr += SECTION_SIZE, addr != end);
+ flush_pmd_entry(pmd);
+}
- flush_pmd_entry(p);
- } else {
+static void __init alloc_init_pmd(pud_t *pud, unsigned long addr,
+ unsigned long end, phys_addr_t phys,
+ const struct mem_type *type)
+{
+ pmd_t *pmd = pmd_offset(pud, addr);
+ unsigned long next;
+
+ do {
/*
- * No need to loop; pte's aren't interested in the
- * individual L1 entries.
+ * With LPAE, we must loop over to map
+ * all the pmds for the given range.
*/
- alloc_init_pte(pmd, addr, end, __phys_to_pfn(phys), type);
- }
+ next = pmd_addr_end(addr, end);
+
+ /*
+ * Try a section mapping - addr, next and phys must all be
+ * aligned to a section boundary.
+ */
+ if (type->prot_sect &&
+ ((addr | next | phys) & ~SECTION_MASK) == 0) {
+ map_init_section(pmd, addr, next, phys, type);
+ } else {
+ alloc_init_pte(pmd, addr, next,
+ __phys_to_pfn(phys), type);
+ }
+
+ phys += next - addr;
+
+ } while (pmd++, addr = next, addr != end);
}
static void __init alloc_init_pud(pgd_t *pgd, unsigned long addr,
@@ -641,7 +680,7 @@ static void __init alloc_init_pud(pgd_t *pgd, unsigned long addr,
do {
next = pud_addr_end(addr, end);
- alloc_init_section(pud, addr, next, phys, type);
+ alloc_init_pmd(pud, addr, next, phys, type);
phys += next - addr;
} while (pud++, addr = next, addr != end);
}
@@ -1256,6 +1295,7 @@ void __init paging_init(struct machine_desc *mdesc)
dma_contiguous_remap();
devicemaps_init(mdesc);
kmap_init();
+ tcm_init();
top_pmd = pmd_off_k(0xffff0000);