This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / avr32 / mm / ioremap.c

diff --git a/arch/avr32/mm/ioremap.c b/arch/avr32/mm/ioremap.c
new file mode 100644 (file)
index 0000000..3437c82
--- /dev/null
+++ b/arch/avr32/mm/ioremap.c
@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2004-2006 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/vmalloc.h>
+#include <linux/module.h>
+#include <linux/io.h>
+
+#include <asm/pgtable.h>
+#include <asm/addrspace.h>
+
+/*
+ * Re-map an arbitrary physical address space into the kernel virtual
+ * address space. Needed when the kernel wants to access physical
+ * memory directly.
+ */
+void __iomem *__ioremap(unsigned long phys_addr, size_t size,
+                       unsigned long flags)
+{
+       unsigned long addr;
+       struct vm_struct *area;
+       unsigned long offset, last_addr;
+       pgprot_t prot;
+
+       /*
+        * Check if we can simply use the P4 segment. This area is
+        * uncacheable, so if caching/buffering is requested, we can't
+        * use it.
+        */
+       if ((phys_addr >= P4SEG) && (flags == 0))
+               return (void __iomem *)phys_addr;
+
+       /* Don't allow wraparound or zero size */
+       last_addr = phys_addr + size - 1;
+       if (!size || last_addr < phys_addr)
+               return NULL;
+
+       /*
+        * XXX: When mapping regular RAM, we'd better make damn sure
+        * it's never used for anything else.  But this is really the
+        * caller's responsibility...
+        */
+       if (PHYSADDR(P2SEGADDR(phys_addr)) == phys_addr)
+               return (void __iomem *)P2SEGADDR(phys_addr);
+
+       /* Mappings have to be page-aligned */
+       offset = phys_addr & ~PAGE_MASK;
+       phys_addr &= PAGE_MASK;
+       size = PAGE_ALIGN(last_addr + 1) - phys_addr;
+
+       prot = __pgprot(_PAGE_PRESENT | _PAGE_GLOBAL | _PAGE_RW | _PAGE_DIRTY
+                       | _PAGE_ACCESSED | _PAGE_TYPE_SMALL | flags);
+
+       /*
+        * Ok, go for it..
+        */
+       area = get_vm_area(size, VM_IOREMAP);
+       if (!area)
+               return NULL;
+       area->phys_addr = phys_addr;
+       addr = (unsigned long )area->addr;
+       if (ioremap_page_range(addr, addr + size, phys_addr, prot)) {
+               vunmap((void *)addr);
+               return NULL;
+       }
+
+       return (void __iomem *)(offset + (char *)addr);
+}
+EXPORT_SYMBOL(__ioremap);
+
+void __iounmap(void __iomem *addr)
+{
+       struct vm_struct *p;
+
+       if ((unsigned long)addr >= P4SEG)
+               return;
+       if (PXSEG(addr) == P2SEG)
+               return;
+
+       p = remove_vm_area((void *)(PAGE_MASK & (unsigned long __force)addr));
+       if (unlikely(!p)) {
+               printk (KERN_ERR "iounmap: bad address %p\n", addr);
+               return;
+       }
+
+       kfree (p);
+}
+EXPORT_SYMBOL(__iounmap);