[PATCH][PPC32] Fix io_remap_page_range for 36-bit phys platforms

[Matt Porter]

Fixes io_remap_page_range() to use the 32-bit address translator
similar to ioremap(). Someday u64 start/end resources should make
this unnecessary. Fixes set_pte() to handle a long long pte_t
properly.

Signed-off-by: Matt Porter <mporter at kernel.crashing.org>

diff -Nru a/arch/ppc/Kconfig b/arch/ppc/Kconfig
--- a/arch/ppc/Kconfig  2004-12-16 17:31:53 -07:00
+++ b/arch/ppc/Kconfig  2004-12-16 17:31:53 -07:00
@@ -97,6 +97,11 @@
        depends on 44x
        default y
 
+config PHYS_64BIT
+       bool
+       depends on 44x
+       default y
+
 config ALTIVEC
        bool "AltiVec Support"
        depends on 6xx || POWER4
diff -Nru a/arch/ppc/syslib/ibm44x_common.c b/arch/ppc/syslib/ibm44x_common.c
--- a/arch/ppc/syslib/ibm44x_common.c   2004-12-16 17:31:53 -07:00
+++ b/arch/ppc/syslib/ibm44x_common.c   2004-12-16 17:31:53 -07:00
@@ -19,6 +19,7 @@
 #include <linux/time.h>
 #include <linux/types.h>
 #include <linux/serial.h>
+#include <linux/module.h>
 
 #include <asm/ibm44x.h>
 #include <asm/mmu.h>
@@ -47,6 +48,7 @@
 
        return (page_4gb | addr);
 };
+EXPORT_SYMBOL(fixup_bigphys_addr);
 
 void __init ibm44x_calibrate_decr(unsigned int freq)
 {
diff -Nru a/include/asm-ppc/pgtable.h b/include/asm-ppc/pgtable.h
--- a/include/asm-ppc/pgtable.h 2004-12-16 17:31:53 -07:00
+++ b/include/asm-ppc/pgtable.h 2004-12-16 17:31:53 -07:00
@@ -431,7 +431,7 @@
 #define pte_pfn(x)             (pte_val(x) >> PAGE_SHIFT)
 #define pte_page(x)            pfn_to_page(pte_pfn(x))
 
-#define pfn_pte(pfn, prot)     __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
+#define pfn_pte(pfn, prot)     __pte(((pte_t)(pfn) << PAGE_SHIFT) | 
pgprot_val(prot))
 #define mk_pte(page, prot)     pfn_pte(page_to_pfn(page), prot)
 
 /*
@@ -714,8 +714,22 @@
 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
 #define kern_addr_valid(addr)  (1)
 
+#ifdef CONFIG_PHYS_64BIT
+extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from,
+                       unsigned long paddr, unsigned long size, pgprot_t prot);
+static inline int io_remap_page_range(struct vm_area_struct *vma,
+                                       unsigned long vaddr,
+                                       unsigned long paddr,
+                                       unsigned long size,
+                                       pgprot_t prot)
+{
+       phys_addr_t paddr64 = fixup_bigphys_addr(paddr, size);
+       return remap_pfn_range(vma, vaddr, paddr64 >> PAGE_SHIFT, size, prot);
+}
+#else
 #define io_remap_page_range(vma, vaddr, paddr, size, prot)             \
                remap_pfn_range(vma, vaddr, (paddr) >> PAGE_SHIFT, size, prot)
+#endif
 
 /*
  * No page table caches to initialise