Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * arch/sh/mm/ioremap.c | |
3 | * | |
d9b9487a PM |
4 | * (C) Copyright 1995 1996 Linus Torvalds |
5 | * (C) Copyright 2005 - 2010 Paul Mundt | |
6 | * | |
1da177e4 LT |
7 | * Re-map IO memory to kernel address space so that we can access it. |
8 | * This is needed for high PCI addresses that aren't mapped in the | |
9 | * 640k-1MB IO memory area on PC's | |
10 | * | |
b66c1a39 PM |
11 | * This file is subject to the terms and conditions of the GNU General |
12 | * Public License. See the file "COPYING" in the main directory of this | |
13 | * archive for more details. | |
1da177e4 | 14 | */ |
1da177e4 | 15 | #include <linux/vmalloc.h> |
b66c1a39 | 16 | #include <linux/module.h> |
5a0e3ad6 | 17 | #include <linux/slab.h> |
1da177e4 | 18 | #include <linux/mm.h> |
a3e61d50 | 19 | #include <linux/pci.h> |
5b3e1a85 | 20 | #include <linux/io.h> |
1da177e4 LT |
21 | #include <asm/page.h> |
22 | #include <asm/pgalloc.h> | |
b66c1a39 | 23 | #include <asm/addrspace.h> |
1da177e4 LT |
24 | #include <asm/cacheflush.h> |
25 | #include <asm/tlbflush.h> | |
0fd14754 | 26 | #include <asm/mmu.h> |
1da177e4 | 27 | |
1da177e4 LT |
28 | /* |
29 | * Remap an arbitrary physical address space into the kernel virtual | |
30 | * address space. Needed when the kernel wants to access high addresses | |
31 | * directly. | |
32 | * | |
33 | * NOTE! We need to allow non-page-aligned mappings too: we will obviously | |
34 | * have to convert them into an offset in a page-aligned mapping, but the | |
35 | * caller shouldn't need to know that small detail. | |
36 | */ | |
bd721ea7 | 37 | void __iomem * __ref |
90e7d649 | 38 | __ioremap_caller(phys_addr_t phys_addr, unsigned long size, |
d57d6408 | 39 | pgprot_t pgprot, void *caller) |
1da177e4 | 40 | { |
bf3cdeda | 41 | struct vm_struct *area; |
b66c1a39 | 42 | unsigned long offset, last_addr, addr, orig_addr; |
90e7d649 | 43 | void __iomem *mapped; |
1da177e4 LT |
44 | |
45 | /* Don't allow wraparound or zero size */ | |
46 | last_addr = phys_addr + size - 1; | |
47 | if (!size || last_addr < phys_addr) | |
48 | return NULL; | |
49 | ||
90e7d649 PM |
50 | /* |
51 | * If we can't yet use the regular approach, go the fixmap route. | |
52 | */ | |
53 | if (!mem_init_done) | |
54 | return ioremap_fixed(phys_addr, size, pgprot); | |
55 | ||
56 | /* | |
57 | * First try to remap through the PMB. | |
58 | * PMB entries are all pre-faulted. | |
59 | */ | |
60 | mapped = pmb_remap_caller(phys_addr, size, pgprot, caller); | |
61 | if (mapped && !IS_ERR(mapped)) | |
62 | return mapped; | |
63 | ||
1da177e4 LT |
64 | /* |
65 | * Mappings have to be page-aligned | |
66 | */ | |
67 | offset = phys_addr & ~PAGE_MASK; | |
68 | phys_addr &= PAGE_MASK; | |
69 | size = PAGE_ALIGN(last_addr+1) - phys_addr; | |
70 | ||
71 | /* | |
72 | * Ok, go for it.. | |
73 | */ | |
bf3cdeda | 74 | area = get_vm_area_caller(size, VM_IOREMAP, caller); |
1da177e4 LT |
75 | if (!area) |
76 | return NULL; | |
77 | area->phys_addr = phys_addr; | |
b66c1a39 PM |
78 | orig_addr = addr = (unsigned long)area->addr; |
79 | ||
90e7d649 PM |
80 | if (ioremap_page_range(addr, addr + size, phys_addr, pgprot)) { |
81 | vunmap((void *)orig_addr); | |
82 | return NULL; | |
1da177e4 | 83 | } |
b66c1a39 PM |
84 | |
85 | return (void __iomem *)(offset + (char *)orig_addr); | |
1da177e4 | 86 | } |
bf3cdeda | 87 | EXPORT_SYMBOL(__ioremap_caller); |
1da177e4 | 88 | |
78bf04fc PM |
89 | /* |
90 | * Simple checks for non-translatable mappings. | |
91 | */ | |
92 | static inline int iomapping_nontranslatable(unsigned long offset) | |
93 | { | |
94 | #ifdef CONFIG_29BIT | |
95 | /* | |
96 | * In 29-bit mode this includes the fixed P1/P2 areas, as well as | |
97 | * parts of P3. | |
98 | */ | |
99 | if (PXSEG(offset) < P3SEG || offset >= P3_ADDR_MAX) | |
100 | return 1; | |
101 | #endif | |
102 | ||
78bf04fc PM |
103 | return 0; |
104 | } | |
105 | ||
b66c1a39 | 106 | void __iounmap(void __iomem *addr) |
1da177e4 | 107 | { |
b66c1a39 PM |
108 | unsigned long vaddr = (unsigned long __force)addr; |
109 | struct vm_struct *p; | |
110 | ||
78bf04fc PM |
111 | /* |
112 | * Nothing to do if there is no translatable mapping. | |
113 | */ | |
114 | if (iomapping_nontranslatable(vaddr)) | |
b66c1a39 PM |
115 | return; |
116 | ||
12b6b01c PM |
117 | /* |
118 | * There's no VMA if it's from an early fixed mapping. | |
119 | */ | |
120 | if (iounmap_fixed(addr) == 0) | |
121 | return; | |
122 | ||
b66c1a39 | 123 | /* |
90e7d649 | 124 | * If the PMB handled it, there's nothing else to do. |
b66c1a39 | 125 | */ |
90e7d649 PM |
126 | if (pmb_unmap(addr) == 0) |
127 | return; | |
b66c1a39 PM |
128 | |
129 | p = remove_vm_area((void *)(vaddr & PAGE_MASK)); | |
130 | if (!p) { | |
866e6b9e | 131 | printk(KERN_ERR "%s: bad address %p\n", __func__, addr); |
b66c1a39 PM |
132 | return; |
133 | } | |
134 | ||
135 | kfree(p); | |
1da177e4 | 136 | } |
b66c1a39 | 137 | EXPORT_SYMBOL(__iounmap); |