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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 | ||
bf4b558e MS |
28 | #include <asm/fixmap.h> |
29 | #include <asm/tlbflush.h> | |
30 | #include <asm/pgalloc.h> | |
31 | ||
fc47897d CM |
32 | static void __iomem *__ioremap_caller(phys_addr_t phys_addr, size_t size, |
33 | pgprot_t prot, void *caller) | |
34 | { | |
35 | unsigned long last_addr; | |
36 | unsigned long offset = phys_addr & ~PAGE_MASK; | |
37 | int err; | |
38 | unsigned long addr; | |
39 | struct vm_struct *area; | |
40 | ||
41 | /* | |
42 | * Page align the mapping address and size, taking account of any | |
43 | * offset. | |
44 | */ | |
45 | phys_addr &= PAGE_MASK; | |
46 | size = PAGE_ALIGN(size + offset); | |
47 | ||
48 | /* | |
49 | * Don't allow wraparound, zero size or outside PHYS_MASK. | |
50 | */ | |
51 | last_addr = phys_addr + size - 1; | |
52 | if (!size || last_addr < phys_addr || (last_addr & ~PHYS_MASK)) | |
53 | return NULL; | |
54 | ||
55 | /* | |
56 | * Don't allow RAM to be mapped. | |
57 | */ | |
58 | if (WARN_ON(pfn_valid(__phys_to_pfn(phys_addr)))) | |
59 | return NULL; | |
60 | ||
61 | area = get_vm_area_caller(size, VM_IOREMAP, caller); | |
62 | if (!area) | |
63 | return NULL; | |
64 | addr = (unsigned long)area->addr; | |
da1f2b82 | 65 | area->phys_addr = phys_addr; |
fc47897d CM |
66 | |
67 | err = ioremap_page_range(addr, addr + size, phys_addr, prot); | |
68 | if (err) { | |
69 | vunmap((void *)addr); | |
70 | return NULL; | |
71 | } | |
72 | ||
73 | return (void __iomem *)(offset + addr); | |
74 | } | |
75 | ||
76 | void __iomem *__ioremap(phys_addr_t phys_addr, size_t size, pgprot_t prot) | |
77 | { | |
78 | return __ioremap_caller(phys_addr, size, prot, | |
79 | __builtin_return_address(0)); | |
80 | } | |
81 | EXPORT_SYMBOL(__ioremap); | |
82 | ||
83 | void __iounmap(volatile void __iomem *io_addr) | |
84 | { | |
c04e8e2f | 85 | unsigned long addr = (unsigned long)io_addr & PAGE_MASK; |
fc47897d | 86 | |
c04e8e2f MS |
87 | /* |
88 | * We could get an address outside vmalloc range in case | |
89 | * of ioremap_cache() reusing a RAM mapping. | |
90 | */ | |
91 | if (VMALLOC_START <= addr && addr < VMALLOC_END) | |
92 | vunmap((void *)addr); | |
fc47897d CM |
93 | } |
94 | EXPORT_SYMBOL(__iounmap); | |
c04e8e2f MS |
95 | |
96 | void __iomem *ioremap_cache(phys_addr_t phys_addr, size_t size) | |
97 | { | |
98 | /* For normal memory we already have a cacheable mapping. */ | |
99 | if (pfn_valid(__phys_to_pfn(phys_addr))) | |
100 | return (void __iomem *)__phys_to_virt(phys_addr); | |
101 | ||
102 | return __ioremap_caller(phys_addr, size, __pgprot(PROT_NORMAL), | |
103 | __builtin_return_address(0)); | |
104 | } | |
105 | EXPORT_SYMBOL(ioremap_cache); | |
bf4b558e | 106 | |
af86e597 LA |
107 | /* |
108 | * Must be called after early_fixmap_init | |
109 | */ | |
bf4b558e MS |
110 | void __init early_ioremap_init(void) |
111 | { | |
bf4b558e MS |
112 | early_ioremap_setup(); |
113 | } |