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fc47897d CM |
1 | /* |
2 | * Based on arch/arm/mm/ioremap.c | |
3 | * | |
4 | * (C) Copyright 1995 1996 Linus Torvalds | |
5 | * Hacked for ARM by Phil Blundell <philb@gnu.org> | |
6 | * Hacked to allow all architectures to build, and various cleanups | |
7 | * by Russell King | |
8 | * Copyright (C) 2012 ARM Ltd. | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
21 | */ | |
22 | ||
23 | #include <linux/export.h> | |
24 | #include <linux/mm.h> | |
25 | #include <linux/vmalloc.h> | |
26 | #include <linux/io.h> | |
27 | ||
28 | static void __iomem *__ioremap_caller(phys_addr_t phys_addr, size_t size, | |
29 | pgprot_t prot, void *caller) | |
30 | { | |
31 | unsigned long last_addr; | |
32 | unsigned long offset = phys_addr & ~PAGE_MASK; | |
33 | int err; | |
34 | unsigned long addr; | |
35 | struct vm_struct *area; | |
36 | ||
37 | /* | |
38 | * Page align the mapping address and size, taking account of any | |
39 | * offset. | |
40 | */ | |
41 | phys_addr &= PAGE_MASK; | |
42 | size = PAGE_ALIGN(size + offset); | |
43 | ||
44 | /* | |
45 | * Don't allow wraparound, zero size or outside PHYS_MASK. | |
46 | */ | |
47 | last_addr = phys_addr + size - 1; | |
48 | if (!size || last_addr < phys_addr || (last_addr & ~PHYS_MASK)) | |
49 | return NULL; | |
50 | ||
51 | /* | |
52 | * Don't allow RAM to be mapped. | |
53 | */ | |
54 | if (WARN_ON(pfn_valid(__phys_to_pfn(phys_addr)))) | |
55 | return NULL; | |
56 | ||
57 | area = get_vm_area_caller(size, VM_IOREMAP, caller); | |
58 | if (!area) | |
59 | return NULL; | |
60 | addr = (unsigned long)area->addr; | |
61 | ||
62 | err = ioremap_page_range(addr, addr + size, phys_addr, prot); | |
63 | if (err) { | |
64 | vunmap((void *)addr); | |
65 | return NULL; | |
66 | } | |
67 | ||
68 | return (void __iomem *)(offset + addr); | |
69 | } | |
70 | ||
71 | void __iomem *__ioremap(phys_addr_t phys_addr, size_t size, pgprot_t prot) | |
72 | { | |
73 | return __ioremap_caller(phys_addr, size, prot, | |
74 | __builtin_return_address(0)); | |
75 | } | |
76 | EXPORT_SYMBOL(__ioremap); | |
77 | ||
78 | void __iounmap(volatile void __iomem *io_addr) | |
79 | { | |
80 | void *addr = (void *)(PAGE_MASK & (unsigned long)io_addr); | |
81 | ||
82 | vunmap(addr); | |
83 | } | |
84 | EXPORT_SYMBOL(__iounmap); |