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1/*
2 * Re-map IO memory to kernel address space so that we can access it.
3 *
4 * These functions should only be used when it is necessary to map a
5 * physical address space into the kernel address space before ioremap()
6 * can be used, e.g. early in boot before paging_init().
7 *
8 * Copyright (C) 2009 Matt Fleming
9 */
10
11#include <linux/vmalloc.h>
12#include <linux/ioport.h>
13#include <linux/module.h>
14#include <linux/mm.h>
15#include <linux/io.h>
16#include <linux/bootmem.h>
17#include <linux/proc_fs.h>
18#include <asm/fixmap.h>
19#include <asm/page.h>
20#include <asm/pgalloc.h>
21#include <asm/addrspace.h>
22#include <asm/cacheflush.h>
23#include <asm/tlbflush.h>
24#include <asm/mmu.h>
25#include <asm/mmu_context.h>
26
27struct ioremap_map {
28 void __iomem *addr;
29 unsigned long size;
30 unsigned long fixmap_addr;
31};
32
33static struct ioremap_map ioremap_maps[FIX_N_IOREMAPS];
34
35void __init ioremap_fixed_init(void)
36{
37 struct ioremap_map *map;
38 int i;
39
40 for (i = 0; i < FIX_N_IOREMAPS; i++) {
41 map = &ioremap_maps[i];
42 map->fixmap_addr = __fix_to_virt(FIX_IOREMAP_BEGIN + i);
43 }
44}
45
46void __init __iomem *
47ioremap_fixed(phys_addr_t phys_addr, unsigned long size, pgprot_t prot)
48{
49 enum fixed_addresses idx0, idx;
50 struct ioremap_map *map;
51 unsigned int nrpages;
52 unsigned long offset;
53 int i, slot;
54
55 /*
56 * Mappings have to be page-aligned
57 */
58 offset = phys_addr & ~PAGE_MASK;
59 phys_addr &= PAGE_MASK;
60 size = PAGE_ALIGN(phys_addr + size) - phys_addr;
61
62 slot = -1;
63 for (i = 0; i < FIX_N_IOREMAPS; i++) {
64 map = &ioremap_maps[i];
65 if (!map->addr) {
66 map->size = size;
67 slot = i;
68 break;
69 }
70 }
71
72 if (slot < 0)
73 return NULL;
74
75 /*
76 * Mappings have to fit in the FIX_IOREMAP area.
77 */
78 nrpages = size >> PAGE_SHIFT;
79 if (nrpages > FIX_N_IOREMAPS)
80 return NULL;
81
82 /*
83 * Ok, go for it..
84 */
85 idx0 = FIX_IOREMAP_BEGIN + slot;
86 idx = idx0;
87 while (nrpages > 0) {
88 pgprot_val(prot) |= _PAGE_WIRED;
89 __set_fixmap(idx, phys_addr, prot);
90 phys_addr += PAGE_SIZE;
91 idx++;
92 --nrpages;
93 }
94
95 map->addr = (void __iomem *)(offset + map->fixmap_addr);
96 return map->addr;
97}
98
99int iounmap_fixed(void __iomem *addr)
100{
101 enum fixed_addresses idx;
102 struct ioremap_map *map;
103 unsigned int nrpages;
104 int i, slot;
105
106 slot = -1;
107 for (i = 0; i < FIX_N_IOREMAPS; i++) {
108 map = &ioremap_maps[i];
109 if (map->addr == addr) {
110 slot = i;
111 break;
112 }
113 }
114
115 /*
116 * If we don't match, it's not for us.
117 */
118 if (slot < 0)
119 return -EINVAL;
120
121 nrpages = map->size >> PAGE_SHIFT;
122
123 idx = FIX_IOREMAP_BEGIN + slot + nrpages - 1;
124 while (nrpages > 0) {
125 __clear_fixmap(idx, __pgprot(_PAGE_WIRED));
126 --idx;
127 --nrpages;
128 }
129
130 map->size = 0;
131 map->addr = NULL;
132
133 return 0;
134}
1/*
2 * Re-map IO memory to kernel address space so that we can access it.
3 *
4 * These functions should only be used when it is necessary to map a
5 * physical address space into the kernel address space before ioremap()
6 * can be used, e.g. early in boot before paging_init().
7 *
8 * Copyright (C) 2009 Matt Fleming
9 */
10
11#include <linux/vmalloc.h>
12#include <linux/ioport.h>
13#include <linux/module.h>
14#include <linux/mm.h>
15#include <linux/io.h>
16#include <linux/bootmem.h>
17#include <linux/proc_fs.h>
18#include <asm/fixmap.h>
19#include <asm/page.h>
20#include <asm/pgalloc.h>
21#include <asm/addrspace.h>
22#include <asm/cacheflush.h>
23#include <asm/tlbflush.h>
24#include <asm/mmu.h>
25#include <asm/mmu_context.h>
26
27struct ioremap_map {
28 void __iomem *addr;
29 unsigned long size;
30 unsigned long fixmap_addr;
31};
32
33static struct ioremap_map ioremap_maps[FIX_N_IOREMAPS];
34
35void __init ioremap_fixed_init(void)
36{
37 struct ioremap_map *map;
38 int i;
39
40 for (i = 0; i < FIX_N_IOREMAPS; i++) {
41 map = &ioremap_maps[i];
42 map->fixmap_addr = __fix_to_virt(FIX_IOREMAP_BEGIN + i);
43 }
44}
45
46void __init __iomem *
47ioremap_fixed(phys_addr_t phys_addr, unsigned long size, pgprot_t prot)
48{
49 enum fixed_addresses idx0, idx;
50 struct ioremap_map *map;
51 unsigned int nrpages;
52 unsigned long offset;
53 int i, slot;
54
55 /*
56 * Mappings have to be page-aligned
57 */
58 offset = phys_addr & ~PAGE_MASK;
59 phys_addr &= PAGE_MASK;
60 size = PAGE_ALIGN(phys_addr + size) - phys_addr;
61
62 slot = -1;
63 for (i = 0; i < FIX_N_IOREMAPS; i++) {
64 map = &ioremap_maps[i];
65 if (!map->addr) {
66 map->size = size;
67 slot = i;
68 break;
69 }
70 }
71
72 if (slot < 0)
73 return NULL;
74
75 /*
76 * Mappings have to fit in the FIX_IOREMAP area.
77 */
78 nrpages = size >> PAGE_SHIFT;
79 if (nrpages > FIX_N_IOREMAPS)
80 return NULL;
81
82 /*
83 * Ok, go for it..
84 */
85 idx0 = FIX_IOREMAP_BEGIN + slot;
86 idx = idx0;
87 while (nrpages > 0) {
88 pgprot_val(prot) |= _PAGE_WIRED;
89 __set_fixmap(idx, phys_addr, prot);
90 phys_addr += PAGE_SIZE;
91 idx++;
92 --nrpages;
93 }
94
95 map->addr = (void __iomem *)(offset + map->fixmap_addr);
96 return map->addr;
97}
98
99int iounmap_fixed(void __iomem *addr)
100{
101 enum fixed_addresses idx;
102 struct ioremap_map *map;
103 unsigned int nrpages;
104 int i, slot;
105
106 slot = -1;
107 for (i = 0; i < FIX_N_IOREMAPS; i++) {
108 map = &ioremap_maps[i];
109 if (map->addr == addr) {
110 slot = i;
111 break;
112 }
113 }
114
115 /*
116 * If we don't match, it's not for us.
117 */
118 if (slot < 0)
119 return -EINVAL;
120
121 nrpages = map->size >> PAGE_SHIFT;
122
123 idx = FIX_IOREMAP_BEGIN + slot + nrpages - 1;
124 while (nrpages > 0) {
125 __clear_fixmap(idx, __pgprot(_PAGE_WIRED));
126 --idx;
127 --nrpages;
128 }
129
130 map->size = 0;
131 map->addr = NULL;
132
133 return 0;
134}