Revert "[PATCH] Generic ioremap_page_range: mips conversion"

The generic version truncates addresses.

This reverts commit 8e087929df884dbb13e383d49d192bdd6928ecbf.

1 files changed, 88 insertions, 8 deletions

diff --git a/arch/mips/mm/ioremap.c b/arch/mips/mm/ioremap.c
index fc2c96f0a1fd..cea7d0ea36e4 100644
--- a/arch/mips/mm/ioremap.c
+++ b/arch/mips/mm/ioremap.c
@@ -6,13 +6,98 @@
  * (C) Copyright 1995 1996 Linus Torvalds
  * (C) Copyright 2001, 2002 Ralf Baechle
  */
-#include <linux/mm.h>
 #include <linux/module.h>
 #include <asm/addrspace.h>
 #include <asm/byteorder.h>
 
 #include <linux/vmalloc.h>
-#include <linux/io.h>
+#include <asm/cacheflush.h>
+#include <asm/io.h>
+#include <asm/tlbflush.h>
+
+static inline void remap_area_pte(pte_t * pte, unsigned long address,
+        phys_t size, phys_t phys_addr, unsigned long flags)
+{
+        phys_t end;
+        unsigned long pfn;
+        pgprot_t pgprot = __pgprot(_PAGE_GLOBAL | _PAGE_PRESENT | __READABLE
+                                   | __WRITEABLE | flags);
+
+        address &= ~PMD_MASK;
+        end = address + size;
+        if (end > PMD_SIZE)
+                end = PMD_SIZE;
+        if (address >= end)
+                BUG();
+        pfn = phys_addr >> PAGE_SHIFT;
+        do {
+                if (!pte_none(*pte)) {
+                        printk("remap_area_pte: page already exists\n");
+                        BUG();
+                }
+                set_pte(pte, pfn_pte(pfn, pgprot));
+                address += PAGE_SIZE;
+                pfn++;
+                pte++;
+        } while (address && (address < end));
+}
+
+static inline int remap_area_pmd(pmd_t * pmd, unsigned long address,
+        phys_t size, phys_t phys_addr, unsigned long flags)
+{
+        phys_t end;
+
+        address &= ~PGDIR_MASK;
+        end = address + size;
+        if (end > PGDIR_SIZE)
+                end = PGDIR_SIZE;
+        phys_addr -= address;
+        if (address >= end)
+                BUG();
+        do {
+                pte_t * pte = pte_alloc_kernel(pmd, address);
+                if (!pte)
+                        return -ENOMEM;
+                remap_area_pte(pte, address, end - address, address + phys_addr, flags);
+                address = (address + PMD_SIZE) & PMD_MASK;
+                pmd++;
+        } while (address && (address < end));
+        return 0;
+}
+
+static int remap_area_pages(unsigned long address, phys_t phys_addr,
+        phys_t size, unsigned long flags)
+{
+        int error;
+        pgd_t * dir;
+        unsigned long end = address + size;
+
+        phys_addr -= address;
+        dir = pgd_offset(&init_mm, address);
+        flush_cache_all();
+        if (address >= end)
+                BUG();
+        do {
+                pud_t *pud;
+                pmd_t *pmd;
+
+                error = -ENOMEM;
+                pud = pud_alloc(&init_mm, dir, address);
+                if (!pud)
+                        break;
+                pmd = pmd_alloc(&init_mm, pud, address);
+                if (!pmd)
+                        break;
+                if (remap_area_pmd(pmd, address, end - address,
+                                         phys_addr + address, flags))
+                        break;
+                error = 0;
+                address = (address + PGDIR_SIZE) & PGDIR_MASK;
+                dir++;
+        } while (address && (address < end));
+        flush_tlb_all();
+        return error;
+}
 
 /*
  * Generic mapping function (not visible outside):
@@ -36,7 +121,6 @@ void __iomem * __ioremap(phys_t phys_addr, phys_t size, unsigned long flags)
         unsigned long offset;
         phys_t last_addr;
         void * addr;
-        pgprot_t pgprot;
 
         phys_addr = fixup_bigphys_addr(phys_addr, size);
 
@@ -68,9 +152,6 @@ void __iomem * __ioremap(phys_t phys_addr, phys_t size, unsigned long flags)
                                 return NULL;
         }
 
-        pgprot = __pgprot(_PAGE_GLOBAL | _PAGE_PRESENT | __READABLE
-                          | __WRITEABLE | flags);
-
         /*
          * Mappings have to be page-aligned
          */
@@ -85,8 +166,7 @@ void __iomem * __ioremap(phys_t phys_addr, phys_t size, unsigned long flags)
         if (!area)
                 return NULL;
         addr = area->addr;
-        if (ioremap_page_range((unsigned long)addr, (unsigned long)addr + size,
-                               phys_addr, pgprot)) {
+        if (remap_area_pages((unsigned long) addr, phys_addr, size, flags)) {
                 vunmap(addr);
                 return NULL;
         }