[MIPS] Allow setting of the cache attribute at run time.

Slightly tacky, but there is a precedent in the sparc archirecture code.

Signed-off-by: Chris Dearman <chris@mips.com>
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

3 files changed, 30 insertions, 35 deletions

diff --git a/include/asm-mips/io.h b/include/asm-mips/io.h
index e62058b0d28c..f18d2816cbec 100644
--- a/include/asm-mips/io.h
+++ b/include/asm-mips/io.h
@@ -273,7 +273,7 @@ static inline void __iomem * __ioremap_mode(phys_t offset, unsigned long size,
  * memory-like regions on I/O busses.
  */
 #define ioremap_cachable(offset, size)                                  \
-        __ioremap_mode((offset), (size), PAGE_CACHABLE_DEFAULT)
+        __ioremap_mode((offset), (size), _page_cachable_default)
 
 /*
  * These two are MIPS specific ioremap variant.  ioremap_cacheable_cow
diff --git a/include/asm-mips/pgtable-bits.h b/include/asm-mips/pgtable-bits.h
index 728fbe7b9946..60e2f9338fcd 100644
--- a/include/asm-mips/pgtable-bits.h
+++ b/include/asm-mips/pgtable-bits.h
@@ -134,18 +134,6 @@
 
 #define _PAGE_CHG_MASK  (PAGE_MASK | _PAGE_ACCESSED | _PAGE_MODIFIED | _CACHE_MASK)
 
-#ifdef CONFIG_MIPS_UNCACHED
-#define PAGE_CACHABLE_DEFAULT   _CACHE_UNCACHED
-#elif defined(CONFIG_DMA_NONCOHERENT)
-#define PAGE_CACHABLE_DEFAULT   _CACHE_CACHABLE_NONCOHERENT
-#elif defined(CONFIG_CPU_RM9000)
-#define PAGE_CACHABLE_DEFAULT   _CACHE_CWB
-#elif defined(CONFIG_SOC_AU1X00)
-#define PAGE_CACHABLE_DEFAULT   _CACHE_CACHABLE_NONCOHERENT
-#else
-#define PAGE_CACHABLE_DEFAULT   _CACHE_CACHABLE_COW
-#endif
-
 #define CONF_CM_DEFAULT         (PAGE_CACHABLE_DEFAULT>>_CACHE_SHIFT)
 
 #endif /* _ASM_PGTABLE_BITS_H */
diff --git a/include/asm-mips/pgtable.h b/include/asm-mips/pgtable.h
index 009b7b14231f..582f56f42f0e 100644
--- a/include/asm-mips/pgtable.h
+++ b/include/asm-mips/pgtable.h
@@ -23,15 +23,15 @@ struct vm_area_struct;
 
 #define PAGE_NONE       __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT)
 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
-                        PAGE_CACHABLE_DEFAULT)
+                                 _page_cachable_default)
 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_READ | \
-                        PAGE_CACHABLE_DEFAULT)
+                                 _page_cachable_default)
 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_READ | \
-                        PAGE_CACHABLE_DEFAULT)
+                                 _page_cachable_default)
 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
-                        _PAGE_GLOBAL | PAGE_CACHABLE_DEFAULT)
+                                 _PAGE_GLOBAL | _page_cachable_default)
 #define PAGE_USERIO     __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
-                        PAGE_CACHABLE_DEFAULT)
+                                 _page_cachable_default)
 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
                         __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
 
@@ -40,23 +40,30 @@ struct vm_area_struct;
  * read. Also, write permissions imply read permissions. This is the closest
  * we can get by reasonable means..
  */
-#define __P000  PAGE_NONE
-#define __P001  PAGE_READONLY
-#define __P010  PAGE_COPY
-#define __P011  PAGE_COPY
-#define __P100  PAGE_READONLY
-#define __P101  PAGE_READONLY
-#define __P110  PAGE_COPY
-#define __P111  PAGE_COPY
-
-#define __S000  PAGE_NONE
-#define __S001  PAGE_READONLY
-#define __S010  PAGE_SHARED
-#define __S011  PAGE_SHARED
-#define __S100  PAGE_READONLY
-#define __S101  PAGE_READONLY
-#define __S110  PAGE_SHARED
-#define __S111  PAGE_SHARED
+
+/*
+ * Dummy values to fill the table in mmap.c
+ * The real values will be generated at runtime
+ */
+#define __P000 __pgprot(0)
+#define __P001 __pgprot(0)
+#define __P010 __pgprot(0)
+#define __P011 __pgprot(0)
+#define __P100 __pgprot(0)
+#define __P101 __pgprot(0)
+#define __P110 __pgprot(0)
+#define __P111 __pgprot(0)
+
+#define __S000 __pgprot(0)
+#define __S001 __pgprot(0)
+#define __S010 __pgprot(0)
+#define __S011 __pgprot(0)
+#define __S100 __pgprot(0)
+#define __S101 __pgprot(0)
+#define __S110 __pgprot(0)
+#define __S111 __pgprot(0)
+
+extern unsigned long _page_cachable_default;
 
 /*
  * ZERO_PAGE is a global shared page that is always zero; used