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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> |
1da177e4 | 17 | #include <linux/mm.h> |
a3e61d50 | 18 | #include <linux/pci.h> |
5b3e1a85 | 19 | #include <linux/io.h> |
1da177e4 LT |
20 | #include <asm/page.h> |
21 | #include <asm/pgalloc.h> | |
b66c1a39 | 22 | #include <asm/addrspace.h> |
1da177e4 LT |
23 | #include <asm/cacheflush.h> |
24 | #include <asm/tlbflush.h> | |
0fd14754 | 25 | #include <asm/mmu.h> |
1da177e4 | 26 | |
1da177e4 LT |
27 | /* |
28 | * Remap an arbitrary physical address space into the kernel virtual | |
29 | * address space. Needed when the kernel wants to access high addresses | |
30 | * directly. | |
31 | * | |
32 | * NOTE! We need to allow non-page-aligned mappings too: we will obviously | |
33 | * have to convert them into an offset in a page-aligned mapping, but the | |
34 | * caller shouldn't need to know that small detail. | |
35 | */ | |
af141531 PM |
36 | void __iomem * __init_refok |
37 | __ioremap_caller(unsigned long phys_addr, unsigned long size, | |
d57d6408 | 38 | pgprot_t pgprot, void *caller) |
1da177e4 | 39 | { |
bf3cdeda | 40 | struct vm_struct *area; |
b66c1a39 | 41 | unsigned long offset, last_addr, addr, orig_addr; |
1da177e4 LT |
42 | |
43 | /* Don't allow wraparound or zero size */ | |
44 | last_addr = phys_addr + size - 1; | |
45 | if (!size || last_addr < phys_addr) | |
46 | return NULL; | |
47 | ||
1da177e4 LT |
48 | /* |
49 | * Mappings have to be page-aligned | |
50 | */ | |
51 | offset = phys_addr & ~PAGE_MASK; | |
52 | phys_addr &= PAGE_MASK; | |
53 | size = PAGE_ALIGN(last_addr+1) - phys_addr; | |
54 | ||
d9b9487a PM |
55 | /* |
56 | * If we can't yet use the regular approach, go the fixmap route. | |
57 | */ | |
58 | if (!mem_init_done) | |
acf2c968 | 59 | return ioremap_fixed(phys_addr, offset, size, pgprot); |
d9b9487a | 60 | |
1da177e4 LT |
61 | /* |
62 | * Ok, go for it.. | |
63 | */ | |
bf3cdeda | 64 | area = get_vm_area_caller(size, VM_IOREMAP, caller); |
1da177e4 LT |
65 | if (!area) |
66 | return NULL; | |
67 | area->phys_addr = phys_addr; | |
b66c1a39 PM |
68 | orig_addr = addr = (unsigned long)area->addr; |
69 | ||
2f47f447 | 70 | #ifdef CONFIG_PMB |
b66c1a39 PM |
71 | /* |
72 | * First try to remap through the PMB once a valid VMA has been | |
73 | * established. Smaller allocations (or the rest of the size | |
74 | * remaining after a PMB mapping due to the size not being | |
75 | * perfectly aligned on a PMB size boundary) are then mapped | |
76 | * through the UTLB using conventional page tables. | |
77 | * | |
78 | * PMB entries are all pre-faulted. | |
79 | */ | |
2bea7ea7 | 80 | if (unlikely(phys_addr >= P1SEG)) { |
d57d6408 | 81 | unsigned long mapped; |
b66c1a39 | 82 | |
7bdda620 | 83 | mapped = pmb_remap(addr, phys_addr, size, pgprot); |
b66c1a39 PM |
84 | if (likely(mapped)) { |
85 | addr += mapped; | |
86 | phys_addr += mapped; | |
87 | size -= mapped; | |
88 | } | |
1da177e4 | 89 | } |
b66c1a39 PM |
90 | #endif |
91 | ||
92 | if (likely(size)) | |
5b3e1a85 | 93 | if (ioremap_page_range(addr, addr + size, phys_addr, pgprot)) { |
b66c1a39 PM |
94 | vunmap((void *)orig_addr); |
95 | return NULL; | |
96 | } | |
97 | ||
98 | return (void __iomem *)(offset + (char *)orig_addr); | |
1da177e4 | 99 | } |
bf3cdeda | 100 | EXPORT_SYMBOL(__ioremap_caller); |
1da177e4 | 101 | |
78bf04fc PM |
102 | /* |
103 | * Simple checks for non-translatable mappings. | |
104 | */ | |
105 | static inline int iomapping_nontranslatable(unsigned long offset) | |
106 | { | |
107 | #ifdef CONFIG_29BIT | |
108 | /* | |
109 | * In 29-bit mode this includes the fixed P1/P2 areas, as well as | |
110 | * parts of P3. | |
111 | */ | |
112 | if (PXSEG(offset) < P3SEG || offset >= P3_ADDR_MAX) | |
113 | return 1; | |
114 | #endif | |
115 | ||
78bf04fc PM |
116 | return 0; |
117 | } | |
118 | ||
b66c1a39 | 119 | void __iounmap(void __iomem *addr) |
1da177e4 | 120 | { |
b66c1a39 PM |
121 | unsigned long vaddr = (unsigned long __force)addr; |
122 | struct vm_struct *p; | |
123 | ||
78bf04fc PM |
124 | /* |
125 | * Nothing to do if there is no translatable mapping. | |
126 | */ | |
127 | if (iomapping_nontranslatable(vaddr)) | |
b66c1a39 PM |
128 | return; |
129 | ||
12b6b01c PM |
130 | /* |
131 | * There's no VMA if it's from an early fixed mapping. | |
132 | */ | |
133 | if (iounmap_fixed(addr) == 0) | |
134 | return; | |
135 | ||
2f47f447 | 136 | #ifdef CONFIG_PMB |
b66c1a39 PM |
137 | /* |
138 | * Purge any PMB entries that may have been established for this | |
139 | * mapping, then proceed with conventional VMA teardown. | |
140 | * | |
141 | * XXX: Note that due to the way that remove_vm_area() does | |
142 | * matching of the resultant VMA, we aren't able to fast-forward | |
143 | * the address past the PMB space until the end of the VMA where | |
144 | * the page tables reside. As such, unmap_vm_area() will be | |
145 | * forced to linearly scan over the area until it finds the page | |
146 | * tables where PTEs that need to be unmapped actually reside, | |
147 | * which is far from optimal. Perhaps we need to use a separate | |
148 | * VMA for the PMB mappings? | |
149 | * -- PFM. | |
150 | */ | |
151 | pmb_unmap(vaddr); | |
152 | #endif | |
153 | ||
154 | p = remove_vm_area((void *)(vaddr & PAGE_MASK)); | |
155 | if (!p) { | |
866e6b9e | 156 | printk(KERN_ERR "%s: bad address %p\n", __func__, addr); |
b66c1a39 PM |
157 | return; |
158 | } | |
159 | ||
160 | kfree(p); | |
1da177e4 | 161 | } |
b66c1a39 | 162 | EXPORT_SYMBOL(__iounmap); |