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1da177e4 LT |
1 | /* |
2 | * arch/cris/mm/ioremap.c | |
3 | * | |
4 | * Re-map IO memory to kernel address space so that we can access it. | |
5 | * Needed for memory-mapped I/O devices mapped outside our normal DRAM | |
6 | * window (that is, all memory-mapped I/O devices). | |
7 | * | |
8 | * (C) Copyright 1995 1996 Linus Torvalds | |
9 | * CRIS-port by Axis Communications AB | |
10 | */ | |
11 | ||
12 | #include <linux/vmalloc.h> | |
e32cbc3d | 13 | #include <linux/io.h> |
1da177e4 | 14 | #include <asm/pgalloc.h> |
4f18cfbf | 15 | #include <asm/arch/memmap.h> |
1da177e4 | 16 | |
1da177e4 LT |
17 | /* |
18 | * Generic mapping function (not visible outside): | |
19 | */ | |
20 | ||
21 | /* | |
22 | * Remap an arbitrary physical address space into the kernel virtual | |
23 | * address space. Needed when the kernel wants to access high addresses | |
24 | * directly. | |
25 | * | |
26 | * NOTE! We need to allow non-page-aligned mappings too: we will obviously | |
27 | * have to convert them into an offset in a page-aligned mapping, but the | |
28 | * caller shouldn't need to know that small detail. | |
29 | */ | |
4f18cfbf | 30 | void __iomem * __ioremap_prot(unsigned long phys_addr, unsigned long size, pgprot_t prot) |
1da177e4 | 31 | { |
4f18cfbf | 32 | void __iomem * addr; |
1da177e4 LT |
33 | struct vm_struct * area; |
34 | unsigned long offset, last_addr; | |
35 | ||
36 | /* Don't allow wraparound or zero size */ | |
37 | last_addr = phys_addr + size - 1; | |
38 | if (!size || last_addr < phys_addr) | |
39 | return NULL; | |
40 | ||
41 | /* | |
42 | * Mappings have to be page-aligned | |
43 | */ | |
44 | offset = phys_addr & ~PAGE_MASK; | |
45 | phys_addr &= PAGE_MASK; | |
46 | size = PAGE_ALIGN(last_addr+1) - phys_addr; | |
47 | ||
48 | /* | |
49 | * Ok, go for it.. | |
50 | */ | |
51 | area = get_vm_area(size, VM_IOREMAP); | |
52 | if (!area) | |
53 | return NULL; | |
4f18cfbf | 54 | addr = (void __iomem *)area->addr; |
e32cbc3d HS |
55 | if (ioremap_page_range((unsigned long)addr, (unsigned long)addr + size, |
56 | phys_addr, prot)) { | |
4f18cfbf | 57 | vfree((void __force *)addr); |
1da177e4 LT |
58 | return NULL; |
59 | } | |
4f18cfbf MS |
60 | return (void __iomem *) (offset + (char __iomem *)addr); |
61 | } | |
62 | ||
63 | void __iomem * __ioremap(unsigned long phys_addr, unsigned long size, unsigned long flags) | |
64 | { | |
65 | return __ioremap_prot(phys_addr, size, | |
66 | __pgprot(_PAGE_PRESENT | __READABLE | | |
67 | __WRITEABLE | _PAGE_GLOBAL | | |
68 | _PAGE_KERNEL | flags)); | |
69 | } | |
70 | ||
71 | /** | |
72 | * ioremap_nocache - map bus memory into CPU space | |
73 | * @offset: bus address of the memory | |
74 | * @size: size of the resource to map | |
75 | * | |
76 | * Must be freed with iounmap. | |
77 | */ | |
78 | ||
79 | void __iomem *ioremap_nocache (unsigned long phys_addr, unsigned long size) | |
80 | { | |
81 | return __ioremap(phys_addr | MEM_NON_CACHEABLE, size, 0); | |
1da177e4 LT |
82 | } |
83 | ||
4f18cfbf | 84 | void iounmap(volatile void __iomem *addr) |
1da177e4 LT |
85 | { |
86 | if (addr > high_memory) | |
87 | return vfree((void *) (PAGE_MASK & (unsigned long) addr)); | |
88 | } |