2 * Copyright (C) 2004-2006 Atmel Corporation
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 #include <linux/vmalloc.h>
10 #include <linux/module.h>
13 #include <asm/pgtable.h>
14 #include <asm/addrspace.h>
17 * Re-map an arbitrary physical address space into the kernel virtual
18 * address space. Needed when the kernel wants to access physical
21 void __iomem
*__ioremap(unsigned long phys_addr
, size_t size
,
25 struct vm_struct
*area
;
26 unsigned long offset
, last_addr
;
30 * Check if we can simply use the P4 segment. This area is
31 * uncacheable, so if caching/buffering is requested, we can't
34 if ((phys_addr
>= P4SEG
) && (flags
== 0))
35 return (void __iomem
*)phys_addr
;
37 /* Don't allow wraparound or zero size */
38 last_addr
= phys_addr
+ size
- 1;
39 if (!size
|| last_addr
< phys_addr
)
43 * XXX: When mapping regular RAM, we'd better make damn sure
44 * it's never used for anything else. But this is really the
45 * caller's responsibility...
47 if (PHYSADDR(P2SEGADDR(phys_addr
)) == phys_addr
)
48 return (void __iomem
*)P2SEGADDR(phys_addr
);
50 /* Mappings have to be page-aligned */
51 offset
= phys_addr
& ~PAGE_MASK
;
52 phys_addr
&= PAGE_MASK
;
53 size
= PAGE_ALIGN(last_addr
+ 1) - phys_addr
;
55 prot
= __pgprot(_PAGE_PRESENT
| _PAGE_GLOBAL
| _PAGE_RW
| _PAGE_DIRTY
56 | _PAGE_ACCESSED
| _PAGE_TYPE_SMALL
| flags
);
61 area
= get_vm_area(size
, VM_IOREMAP
);
64 area
->phys_addr
= phys_addr
;
65 addr
= (unsigned long )area
->addr
;
66 if (ioremap_page_range(addr
, addr
+ size
, phys_addr
, prot
)) {
71 return (void __iomem
*)(offset
+ (char *)addr
);
73 EXPORT_SYMBOL(__ioremap
);
75 void __iounmap(void __iomem
*addr
)
79 if ((unsigned long)addr
>= P4SEG
)
81 if (PXSEG(addr
) == P2SEG
)
84 p
= remove_vm_area((void *)(PAGE_MASK
& (unsigned long __force
)addr
));
86 printk (KERN_ERR
"iounmap: bad address %p\n", addr
);
92 EXPORT_SYMBOL(__iounmap
);
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