[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>

4 files changed, 28 insertions, 20 deletions

diff --git a/include/asm-arm/arch-ixp23xx/io.h b/include/asm-arm/arch-ixp23xx/io.h
index 18415a81ac74..66f5bafc315c 100644
--- a/include/asm-arm/arch-ixp23xx/io.h
+++ b/include/asm-arm/arch-ixp23xx/io.h
@@ -23,7 +23,7 @@
 #include <linux/kernel.h>       /* For BUG */
 
 static inline void __iomem *
-ixp23xx_ioremap(unsigned long addr, unsigned long size, unsigned long flags)
+ixp23xx_ioremap(unsigned long addr, unsigned long size, unsigned int mtype)
 {
         if (addr >= IXP23XX_PCI_MEM_START &&
                 addr <= IXP23XX_PCI_MEM_START + IXP23XX_PCI_MEM_SIZE) {
@@ -34,7 +34,7 @@ ixp23xx_ioremap(unsigned long addr, unsigned long size, unsigned long flags)
                         ((addr - IXP23XX_PCI_MEM_START) + IXP23XX_PCI_MEM_VIRT);
         }
 
-        return __ioremap(addr, size, flags);
+        return __arm_ioremap(addr, size, mtype);
 }
 
 static inline void
diff --git a/include/asm-arm/arch-ixp4xx/io.h b/include/asm-arm/arch-ixp4xx/io.h
index a41ba229c564..b27c910adf9d 100644
--- a/include/asm-arm/arch-ixp4xx/io.h
+++ b/include/asm-arm/arch-ixp4xx/io.h
@@ -59,10 +59,10 @@ extern int ixp4xx_pci_write(u32 addr, u32 cmd, u32 data);
  * fallback to the default.
  */
 static inline void __iomem *
-__ixp4xx_ioremap(unsigned long addr, size_t size, unsigned long flags)
+__ixp4xx_ioremap(unsigned long addr, size_t size, unsigned int mtype)
 {
         if((addr < 0x48000000) || (addr > 0x4fffffff))
-                return __ioremap(addr, size, flags);
+                return __arm_ioremap(addr, size, mtype);
 
         return (void *)addr;
 }
diff --git a/include/asm-arm/io.h b/include/asm-arm/io.h
index 5f60b4220906..8261ff9e7955 100644
--- a/include/asm-arm/io.h
+++ b/include/asm-arm/io.h
@@ -56,13 +56,22 @@ extern void __raw_readsl(const void __iomem *addr, void *data, int longlen);
 
 /*
  * Architecture ioremap implementation.
- *
- * __ioremap takes CPU physical address.
- *
- * __ioremap_pfn takes a Page Frame Number and an offset into that page
  */
-extern void __iomem * __ioremap_pfn(unsigned long, unsigned long, size_t, unsigned long);
-extern void __iomem * __ioremap(unsigned long, size_t, unsigned long);
+#define MT_DEVICE               0
+#define MT_DEVICE_NONSHARED     1
+#define MT_DEVICE_CACHED        2
+#define MT_DEVICE_IXP2000       3
+/*
+ * types 4 onwards can be found in asm/mach/map.h and are undefined
+ * for ioremap
+ */
+
+/*
+ * __arm_ioremap takes CPU physical address.
+ * __arm_ioremap_pfn takes a Page Frame Number and an offset into that page
+ */
+extern void __iomem * __arm_ioremap_pfn(unsigned long, unsigned long, size_t, unsigned int);
+extern void __iomem * __arm_ioremap(unsigned long, size_t, unsigned int);
 extern void __iounmap(volatile void __iomem *addr);
 
 /*
@@ -203,14 +212,14 @@ extern void _memset_io(volatile void __iomem *, int, size_t);
  *
  */
 #ifndef __arch_ioremap
-#define ioremap(cookie,size)            __ioremap(cookie,size,0)
-#define ioremap_nocache(cookie,size)    __ioremap(cookie,size,0)
-#define ioremap_cached(cookie,size)     __ioremap(cookie,size,L_PTE_CACHEABLE)
+#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 iounmap(cookie)                 __iounmap(cookie)
 #else
-#define ioremap(cookie,size)            __arch_ioremap((cookie),(size),0)
-#define ioremap_nocache(cookie,size)    __arch_ioremap((cookie),(size),0)
-#define ioremap_cached(cookie,size)     __arch_ioremap((cookie),(size),L_PTE_CACHEABLE)
+#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 iounmap(cookie)                 __arch_iounmap(cookie)
 #endif
 
diff --git a/include/asm-arm/mach/map.h b/include/asm-arm/mach/map.h
index 8afef40730af..7ef3c8390180 100644
--- a/include/asm-arm/mach/map.h
+++ b/include/asm-arm/mach/map.h
@@ -9,6 +9,8 @@
  *
  *  Page table mapping constructs and function prototypes
  */
+#include <asm/io.h>
+
 struct map_desc {
         unsigned long virtual;
         unsigned long pfn;
@@ -16,10 +18,7 @@ struct map_desc {
         unsigned int type;
 };
 
-#define MT_DEVICE               0
-#define MT_DEVICE_NONSHARED     1
-#define MT_DEVICE_CACHED        2
-#define MT_DEVICE_IXP2000       3
+/* types 0-3 are defined in asm/io.h */
 #define MT_CACHECLEAN           4
 #define MT_MINICLEAN            5
 #define MT_LOW_VECTORS          6