Commit | Line | Data |
---|---|---|
9e5c33d7 MS |
1 | /* |
2 | * Provide common bits of early_ioremap() support for architectures needing | |
3 | * temporary mappings during boot before ioremap() is available. | |
4 | * | |
5 | * This is mostly a direct copy of the x86 early_ioremap implementation. | |
6 | * | |
7 | * (C) Copyright 1995 1996, 2014 Linus Torvalds | |
8 | * | |
9 | */ | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/io.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/mm.h> | |
16 | #include <linux/vmalloc.h> | |
17 | #include <asm/fixmap.h> | |
4f1af60b | 18 | #include <asm/early_ioremap.h> |
9e5c33d7 MS |
19 | |
20 | #ifdef CONFIG_MMU | |
21 | static int early_ioremap_debug __initdata; | |
22 | ||
23 | static int __init early_ioremap_debug_setup(char *str) | |
24 | { | |
25 | early_ioremap_debug = 1; | |
26 | ||
27 | return 0; | |
28 | } | |
29 | early_param("early_ioremap_debug", early_ioremap_debug_setup); | |
30 | ||
31 | static int after_paging_init __initdata; | |
32 | ||
8f716c9b TL |
33 | pgprot_t __init __weak early_memremap_pgprot_adjust(resource_size_t phys_addr, |
34 | unsigned long size, | |
35 | pgprot_t prot) | |
36 | { | |
37 | return prot; | |
38 | } | |
39 | ||
9e5c33d7 MS |
40 | void __init __weak early_ioremap_shutdown(void) |
41 | { | |
42 | } | |
43 | ||
44 | void __init early_ioremap_reset(void) | |
45 | { | |
46 | early_ioremap_shutdown(); | |
47 | after_paging_init = 1; | |
48 | } | |
49 | ||
50 | /* | |
51 | * Generally, ioremap() is available after paging_init() has been called. | |
52 | * Architectures wanting to allow early_ioremap after paging_init() can | |
53 | * define __late_set_fixmap and __late_clear_fixmap to do the right thing. | |
54 | */ | |
55 | #ifndef __late_set_fixmap | |
56 | static inline void __init __late_set_fixmap(enum fixed_addresses idx, | |
57 | phys_addr_t phys, pgprot_t prot) | |
58 | { | |
59 | BUG(); | |
60 | } | |
61 | #endif | |
62 | ||
63 | #ifndef __late_clear_fixmap | |
64 | static inline void __init __late_clear_fixmap(enum fixed_addresses idx) | |
65 | { | |
66 | BUG(); | |
67 | } | |
68 | #endif | |
69 | ||
70 | static void __iomem *prev_map[FIX_BTMAPS_SLOTS] __initdata; | |
71 | static unsigned long prev_size[FIX_BTMAPS_SLOTS] __initdata; | |
72 | static unsigned long slot_virt[FIX_BTMAPS_SLOTS] __initdata; | |
73 | ||
74 | void __init early_ioremap_setup(void) | |
75 | { | |
76 | int i; | |
77 | ||
78 | for (i = 0; i < FIX_BTMAPS_SLOTS; i++) | |
79 | if (WARN_ON(prev_map[i])) | |
80 | break; | |
81 | ||
82 | for (i = 0; i < FIX_BTMAPS_SLOTS; i++) | |
83 | slot_virt[i] = __fix_to_virt(FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*i); | |
84 | } | |
85 | ||
86 | static int __init check_early_ioremap_leak(void) | |
87 | { | |
88 | int count = 0; | |
89 | int i; | |
90 | ||
91 | for (i = 0; i < FIX_BTMAPS_SLOTS; i++) | |
92 | if (prev_map[i]) | |
93 | count++; | |
94 | ||
95 | if (WARN(count, KERN_WARNING | |
96 | "Debug warning: early ioremap leak of %d areas detected.\n" | |
97 | "please boot with early_ioremap_debug and report the dmesg.\n", | |
98 | count)) | |
99 | return 1; | |
100 | return 0; | |
101 | } | |
102 | late_initcall(check_early_ioremap_leak); | |
103 | ||
104 | static void __init __iomem * | |
105 | __early_ioremap(resource_size_t phys_addr, unsigned long size, pgprot_t prot) | |
106 | { | |
107 | unsigned long offset; | |
108 | resource_size_t last_addr; | |
109 | unsigned int nrpages; | |
110 | enum fixed_addresses idx; | |
111 | int i, slot; | |
112 | ||
113 | WARN_ON(system_state != SYSTEM_BOOTING); | |
114 | ||
115 | slot = -1; | |
116 | for (i = 0; i < FIX_BTMAPS_SLOTS; i++) { | |
117 | if (!prev_map[i]) { | |
118 | slot = i; | |
119 | break; | |
120 | } | |
121 | } | |
122 | ||
123 | if (WARN(slot < 0, "%s(%08llx, %08lx) not found slot\n", | |
124 | __func__, (u64)phys_addr, size)) | |
125 | return NULL; | |
126 | ||
127 | /* Don't allow wraparound or zero size */ | |
128 | last_addr = phys_addr + size - 1; | |
129 | if (WARN_ON(!size || last_addr < phys_addr)) | |
130 | return NULL; | |
131 | ||
132 | prev_size[slot] = size; | |
133 | /* | |
134 | * Mappings have to be page-aligned | |
135 | */ | |
5d57b014 | 136 | offset = offset_in_page(phys_addr); |
9e5c33d7 MS |
137 | phys_addr &= PAGE_MASK; |
138 | size = PAGE_ALIGN(last_addr + 1) - phys_addr; | |
139 | ||
140 | /* | |
141 | * Mappings have to fit in the FIX_BTMAP area. | |
142 | */ | |
143 | nrpages = size >> PAGE_SHIFT; | |
144 | if (WARN_ON(nrpages > NR_FIX_BTMAPS)) | |
145 | return NULL; | |
146 | ||
147 | /* | |
148 | * Ok, go for it.. | |
149 | */ | |
150 | idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*slot; | |
151 | while (nrpages > 0) { | |
152 | if (after_paging_init) | |
153 | __late_set_fixmap(idx, phys_addr, prot); | |
154 | else | |
155 | __early_set_fixmap(idx, phys_addr, prot); | |
156 | phys_addr += PAGE_SIZE; | |
157 | --idx; | |
158 | --nrpages; | |
159 | } | |
160 | WARN(early_ioremap_debug, "%s(%08llx, %08lx) [%d] => %08lx + %08lx\n", | |
161 | __func__, (u64)phys_addr, size, slot, offset, slot_virt[slot]); | |
162 | ||
163 | prev_map[slot] = (void __iomem *)(offset + slot_virt[slot]); | |
164 | return prev_map[slot]; | |
165 | } | |
166 | ||
167 | void __init early_iounmap(void __iomem *addr, unsigned long size) | |
168 | { | |
169 | unsigned long virt_addr; | |
170 | unsigned long offset; | |
171 | unsigned int nrpages; | |
172 | enum fixed_addresses idx; | |
173 | int i, slot; | |
174 | ||
175 | slot = -1; | |
176 | for (i = 0; i < FIX_BTMAPS_SLOTS; i++) { | |
177 | if (prev_map[i] == addr) { | |
178 | slot = i; | |
179 | break; | |
180 | } | |
181 | } | |
182 | ||
183 | if (WARN(slot < 0, "early_iounmap(%p, %08lx) not found slot\n", | |
184 | addr, size)) | |
185 | return; | |
186 | ||
187 | if (WARN(prev_size[slot] != size, | |
188 | "early_iounmap(%p, %08lx) [%d] size not consistent %08lx\n", | |
189 | addr, size, slot, prev_size[slot])) | |
190 | return; | |
191 | ||
192 | WARN(early_ioremap_debug, "early_iounmap(%p, %08lx) [%d]\n", | |
193 | addr, size, slot); | |
194 | ||
195 | virt_addr = (unsigned long)addr; | |
196 | if (WARN_ON(virt_addr < fix_to_virt(FIX_BTMAP_BEGIN))) | |
197 | return; | |
198 | ||
5d57b014 | 199 | offset = offset_in_page(virt_addr); |
9e5c33d7 MS |
200 | nrpages = PAGE_ALIGN(offset + size) >> PAGE_SHIFT; |
201 | ||
202 | idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*slot; | |
203 | while (nrpages > 0) { | |
204 | if (after_paging_init) | |
205 | __late_clear_fixmap(idx); | |
206 | else | |
207 | __early_set_fixmap(idx, 0, FIXMAP_PAGE_CLEAR); | |
208 | --idx; | |
209 | --nrpages; | |
210 | } | |
211 | prev_map[slot] = NULL; | |
212 | } | |
213 | ||
214 | /* Remap an IO device */ | |
215 | void __init __iomem * | |
216 | early_ioremap(resource_size_t phys_addr, unsigned long size) | |
217 | { | |
218 | return __early_ioremap(phys_addr, size, FIXMAP_PAGE_IO); | |
219 | } | |
220 | ||
221 | /* Remap memory */ | |
222 | void __init * | |
223 | early_memremap(resource_size_t phys_addr, unsigned long size) | |
224 | { | |
8f716c9b TL |
225 | pgprot_t prot = early_memremap_pgprot_adjust(phys_addr, size, |
226 | FIXMAP_PAGE_NORMAL); | |
227 | ||
228 | return (__force void *)__early_ioremap(phys_addr, size, prot); | |
9e5c33d7 | 229 | } |
2592dbbb JG |
230 | #ifdef FIXMAP_PAGE_RO |
231 | void __init * | |
232 | early_memremap_ro(resource_size_t phys_addr, unsigned long size) | |
233 | { | |
8f716c9b TL |
234 | pgprot_t prot = early_memremap_pgprot_adjust(phys_addr, size, |
235 | FIXMAP_PAGE_RO); | |
236 | ||
237 | return (__force void *)__early_ioremap(phys_addr, size, prot); | |
2592dbbb JG |
238 | } |
239 | #endif | |
6b0f68e3 | 240 | |
f88a68fa TL |
241 | #ifdef CONFIG_ARCH_USE_MEMREMAP_PROT |
242 | void __init * | |
243 | early_memremap_prot(resource_size_t phys_addr, unsigned long size, | |
244 | unsigned long prot_val) | |
245 | { | |
246 | return (__force void *)__early_ioremap(phys_addr, size, | |
247 | __pgprot(prot_val)); | |
248 | } | |
249 | #endif | |
250 | ||
6b0f68e3 MS |
251 | #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT) |
252 | ||
253 | void __init copy_from_early_mem(void *dest, phys_addr_t src, unsigned long size) | |
254 | { | |
255 | unsigned long slop, clen; | |
256 | char *p; | |
257 | ||
258 | while (size) { | |
5d57b014 | 259 | slop = offset_in_page(src); |
6b0f68e3 MS |
260 | clen = size; |
261 | if (clen > MAX_MAP_CHUNK - slop) | |
262 | clen = MAX_MAP_CHUNK - slop; | |
263 | p = early_memremap(src & PAGE_MASK, clen + slop); | |
264 | memcpy(dest, p + slop, clen); | |
265 | early_memunmap(p, clen + slop); | |
266 | dest += clen; | |
267 | src += clen; | |
268 | size -= clen; | |
269 | } | |
270 | } | |
271 | ||
9e5c33d7 MS |
272 | #else /* CONFIG_MMU */ |
273 | ||
274 | void __init __iomem * | |
275 | early_ioremap(resource_size_t phys_addr, unsigned long size) | |
276 | { | |
277 | return (__force void __iomem *)phys_addr; | |
278 | } | |
279 | ||
280 | /* Remap memory */ | |
281 | void __init * | |
282 | early_memremap(resource_size_t phys_addr, unsigned long size) | |
283 | { | |
284 | return (void *)phys_addr; | |
285 | } | |
2592dbbb JG |
286 | void __init * |
287 | early_memremap_ro(resource_size_t phys_addr, unsigned long size) | |
288 | { | |
289 | return (void *)phys_addr; | |
290 | } | |
9e5c33d7 MS |
291 | |
292 | void __init early_iounmap(void __iomem *addr, unsigned long size) | |
293 | { | |
294 | } | |
295 | ||
296 | #endif /* CONFIG_MMU */ | |
297 | ||
298 | ||
299 | void __init early_memunmap(void *addr, unsigned long size) | |
300 | { | |
301 | early_iounmap((__force void __iomem *)addr, size); | |
302 | } |