[ARM] mm 10: allow memory type to be specified with ioremap

__ioremap() took a set of page table flags (specifically the cacheable
and bufferable bits) to control the mapping type.  However, with
the advent of ARMv6, this is far too limited.

Replace the page table flags with a memory type index, so that the
desired attributes can be selected from the mem_type table.

Finally, to prevent silent miscompilation due to the differing
arguments, rename the __ioremap() and __ioremap_pfn() functions.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 15 insertions, 17 deletions

diff --git a/arch/arm/mm/ioremap.c b/arch/arm/mm/ioremap.c
index 216623eece35..d6167ad4e011 100644
--- a/arch/arm/mm/ioremap.c
+++ b/arch/arm/mm/ioremap.c
@@ -262,11 +262,10 @@ remap_area_supersections(unsigned long virt, unsigned long pfn,
  * mapping.  See include/asm-arm/proc-armv/pgtable.h for more information.
  */
 void __iomem *
-__ioremap_pfn(unsigned long pfn, unsigned long offset, size_t size,
-              unsigned long flags)
+__arm_ioremap_pfn(unsigned long pfn, unsigned long offset, size_t size,
+                  unsigned int mtype)
 {
         const struct mem_type *type;
-        struct mem_type t;
         int err;
         unsigned long addr;
         struct vm_struct * area;
@@ -277,10 +276,9 @@ __ioremap_pfn(unsigned long pfn, unsigned long offset, size_t size,
         if (pfn >= 0x100000 && (__pfn_to_phys(pfn) & ~SUPERSECTION_MASK))
                 return NULL;
 
-        t = *get_mem_type(MT_DEVICE);
-        t.prot_sect |= flags;
-        t.prot_pte |= flags;
-        type = &t;
+        type = get_mem_type(mtype);
+        if (!type)
+                return NULL;
 
         size = PAGE_ALIGN(size);
 
@@ -311,10 +309,10 @@ __ioremap_pfn(unsigned long pfn, unsigned long offset, size_t size,
         flush_cache_vmap(addr, addr + size);
         return (void __iomem *) (offset + addr);
 }
-EXPORT_SYMBOL(__ioremap_pfn);
+EXPORT_SYMBOL(__arm_ioremap_pfn);
 
 void __iomem *
-__ioremap(unsigned long phys_addr, size_t size, unsigned long flags)
+__arm_ioremap(unsigned long phys_addr, size_t size, unsigned int mtype)
 {
         unsigned long last_addr;
         unsigned long offset = phys_addr & ~PAGE_MASK;
@@ -332,9 +330,9 @@ __ioremap(unsigned long phys_addr, size_t size, unsigned long flags)
          */
         size = PAGE_ALIGN(last_addr + 1) - phys_addr;
 
-        return __ioremap_pfn(pfn, offset, size, flags);
+        return __arm_ioremap_pfn(pfn, offset, size, mtype);
 }
-EXPORT_SYMBOL(__ioremap);
+EXPORT_SYMBOL(__arm_ioremap);
 
 void __iounmap(volatile void __iomem *addr)
 {
diff --git a/arch/arm/mm/nommu.c b/arch/arm/mm/nommu.c
index 05818fc0c705..8cd3a60954f0 100644
--- a/arch/arm/mm/nommu.c
+++ b/arch/arm/mm/nommu.c
@@ -62,21 +62,21 @@ void flush_dcache_page(struct page *page)
 }
 EXPORT_SYMBOL(flush_dcache_page);
 
-void __iomem *__ioremap_pfn(unsigned long pfn, unsigned long offset,
-                            size_t size, unsigned long flags)
+void __iomem *__arm_ioremap_pfn(unsigned long pfn, unsigned long offset,
+                                size_t size, unsigned int mtype)
 {
         if (pfn >= (0x100000000ULL >> PAGE_SHIFT))
                 return NULL;
         return (void __iomem *) (offset + (pfn << PAGE_SHIFT));
 }
-EXPORT_SYMBOL(__ioremap_pfn);
+EXPORT_SYMBOL(__arm_ioremap_pfn);
 
-void __iomem *__ioremap(unsigned long phys_addr, size_t size,
-                        unsigned long flags)
+void __iomem *__arm_ioremap(unsigned long phys_addr, size_t size,
+                            unsigned int mtype)
 {
         return (void __iomem *)phys_addr;
 }
-EXPORT_SYMBOL(__ioremap);
+EXPORT_SYMBOL(__arm_ioremap);
 
 void __iounmap(volatile void __iomem *addr)
 {