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1bccc43c GU |
1 | /* |
2 | * linux/arch/m68k/mm/kmap.c | |
3 | * | |
4 | * Copyright (C) 1997 Roman Hodek | |
5 | * | |
6 | * 10/01/99 cleaned up the code and changing to the same interface | |
7 | * used by other architectures /Roman Zippel | |
8 | */ | |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/mm.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/string.h> | |
14 | #include <linux/types.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/vmalloc.h> | |
17 | ||
18 | #include <asm/setup.h> | |
19 | #include <asm/segment.h> | |
20 | #include <asm/page.h> | |
21 | #include <asm/pgalloc.h> | |
22 | #include <asm/io.h> | |
1bccc43c GU |
23 | |
24 | #undef DEBUG | |
25 | ||
26 | #define PTRTREESIZE (256*1024) | |
27 | ||
28 | /* | |
29 | * For 040/060 we can use the virtual memory area like other architectures, | |
30 | * but for 020/030 we want to use early termination page descriptor and we | |
31 | * can't mix this with normal page descriptors, so we have to copy that code | |
32 | * (mm/vmalloc.c) and return appriorate aligned addresses. | |
33 | */ | |
34 | ||
35 | #ifdef CPU_M68040_OR_M68060_ONLY | |
36 | ||
37 | #define IO_SIZE PAGE_SIZE | |
38 | ||
39 | static inline struct vm_struct *get_io_area(unsigned long size) | |
40 | { | |
41 | return get_vm_area(size, VM_IOREMAP); | |
42 | } | |
43 | ||
44 | ||
45 | static inline void free_io_area(void *addr) | |
46 | { | |
47 | vfree((void *)(PAGE_MASK & (unsigned long)addr)); | |
48 | } | |
49 | ||
1da177e4 | 50 | #else |
1bccc43c GU |
51 | |
52 | #define IO_SIZE (256*1024) | |
53 | ||
54 | static struct vm_struct *iolist; | |
55 | ||
56 | static struct vm_struct *get_io_area(unsigned long size) | |
57 | { | |
58 | unsigned long addr; | |
59 | struct vm_struct **p, *tmp, *area; | |
60 | ||
61 | area = kmalloc(sizeof(*area), GFP_KERNEL); | |
62 | if (!area) | |
63 | return NULL; | |
64 | addr = KMAP_START; | |
65 | for (p = &iolist; (tmp = *p) ; p = &tmp->next) { | |
66 | if (size + addr < (unsigned long)tmp->addr) | |
67 | break; | |
68 | if (addr > KMAP_END-size) { | |
69 | kfree(area); | |
70 | return NULL; | |
71 | } | |
72 | addr = tmp->size + (unsigned long)tmp->addr; | |
73 | } | |
74 | area->addr = (void *)addr; | |
75 | area->size = size + IO_SIZE; | |
76 | area->next = *p; | |
77 | *p = area; | |
78 | return area; | |
79 | } | |
80 | ||
81 | static inline void free_io_area(void *addr) | |
82 | { | |
83 | struct vm_struct **p, *tmp; | |
84 | ||
85 | if (!addr) | |
86 | return; | |
87 | addr = (void *)((unsigned long)addr & -IO_SIZE); | |
88 | for (p = &iolist ; (tmp = *p) ; p = &tmp->next) { | |
89 | if (tmp->addr == addr) { | |
90 | *p = tmp->next; | |
91 | __iounmap(tmp->addr, tmp->size); | |
92 | kfree(tmp); | |
93 | return; | |
94 | } | |
95 | } | |
96 | } | |
97 | ||
1da177e4 | 98 | #endif |
1bccc43c GU |
99 | |
100 | /* | |
101 | * Map some physical address range into the kernel address space. | |
102 | */ | |
103 | /* Rewritten by Andreas Schwab to remove all races. */ | |
104 | ||
105 | void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag) | |
106 | { | |
107 | struct vm_struct *area; | |
108 | unsigned long virtaddr, retaddr; | |
109 | long offset; | |
110 | pgd_t *pgd_dir; | |
111 | pmd_t *pmd_dir; | |
112 | pte_t *pte_dir; | |
113 | ||
114 | /* | |
115 | * Don't allow mappings that wrap.. | |
116 | */ | |
117 | if (!size || physaddr > (unsigned long)(-size)) | |
118 | return NULL; | |
119 | ||
120 | #ifdef CONFIG_AMIGA | |
121 | if (MACH_IS_AMIGA) { | |
122 | if ((physaddr >= 0x40000000) && (physaddr + size < 0x60000000) | |
123 | && (cacheflag == IOMAP_NOCACHE_SER)) | |
124 | return (void __iomem *)physaddr; | |
125 | } | |
126 | #endif | |
127 | ||
128 | #ifdef DEBUG | |
129 | printk("ioremap: 0x%lx,0x%lx(%d) - ", physaddr, size, cacheflag); | |
130 | #endif | |
131 | /* | |
132 | * Mappings have to be aligned | |
133 | */ | |
134 | offset = physaddr & (IO_SIZE - 1); | |
135 | physaddr &= -IO_SIZE; | |
136 | size = (size + offset + IO_SIZE - 1) & -IO_SIZE; | |
137 | ||
138 | /* | |
139 | * Ok, go for it.. | |
140 | */ | |
141 | area = get_io_area(size); | |
142 | if (!area) | |
143 | return NULL; | |
144 | ||
145 | virtaddr = (unsigned long)area->addr; | |
146 | retaddr = virtaddr + offset; | |
147 | #ifdef DEBUG | |
148 | printk("0x%lx,0x%lx,0x%lx", physaddr, virtaddr, retaddr); | |
149 | #endif | |
150 | ||
151 | /* | |
152 | * add cache and table flags to physical address | |
153 | */ | |
154 | if (CPU_IS_040_OR_060) { | |
155 | physaddr |= (_PAGE_PRESENT | _PAGE_GLOBAL040 | | |
156 | _PAGE_ACCESSED | _PAGE_DIRTY); | |
157 | switch (cacheflag) { | |
158 | case IOMAP_FULL_CACHING: | |
159 | physaddr |= _PAGE_CACHE040; | |
160 | break; | |
161 | case IOMAP_NOCACHE_SER: | |
162 | default: | |
163 | physaddr |= _PAGE_NOCACHE_S; | |
164 | break; | |
165 | case IOMAP_NOCACHE_NONSER: | |
166 | physaddr |= _PAGE_NOCACHE; | |
167 | break; | |
168 | case IOMAP_WRITETHROUGH: | |
169 | physaddr |= _PAGE_CACHE040W; | |
170 | break; | |
171 | } | |
172 | } else { | |
d49316e8 GU |
173 | physaddr |= (_PAGE_PRESENT | _PAGE_ACCESSED | |
174 | _PAGE_DIRTY | _PAGE_READWRITE); | |
1bccc43c GU |
175 | switch (cacheflag) { |
176 | case IOMAP_NOCACHE_SER: | |
177 | case IOMAP_NOCACHE_NONSER: | |
178 | default: | |
179 | physaddr |= _PAGE_NOCACHE030; | |
180 | break; | |
181 | case IOMAP_FULL_CACHING: | |
182 | case IOMAP_WRITETHROUGH: | |
183 | break; | |
184 | } | |
185 | } | |
186 | ||
187 | while ((long)size > 0) { | |
188 | #ifdef DEBUG | |
189 | if (!(virtaddr & (PTRTREESIZE-1))) | |
190 | printk ("\npa=%#lx va=%#lx ", physaddr, virtaddr); | |
191 | #endif | |
192 | pgd_dir = pgd_offset_k(virtaddr); | |
193 | pmd_dir = pmd_alloc(&init_mm, pgd_dir, virtaddr); | |
194 | if (!pmd_dir) { | |
195 | printk("ioremap: no mem for pmd_dir\n"); | |
196 | return NULL; | |
197 | } | |
198 | ||
199 | if (CPU_IS_020_OR_030) { | |
200 | pmd_dir->pmd[(virtaddr/PTRTREESIZE) & 15] = physaddr; | |
201 | physaddr += PTRTREESIZE; | |
202 | virtaddr += PTRTREESIZE; | |
203 | size -= PTRTREESIZE; | |
204 | } else { | |
205 | pte_dir = pte_alloc_kernel(pmd_dir, virtaddr); | |
206 | if (!pte_dir) { | |
207 | printk("ioremap: no mem for pte_dir\n"); | |
208 | return NULL; | |
209 | } | |
210 | ||
211 | pte_val(*pte_dir) = physaddr; | |
212 | virtaddr += PAGE_SIZE; | |
213 | physaddr += PAGE_SIZE; | |
214 | size -= PAGE_SIZE; | |
215 | } | |
216 | } | |
217 | #ifdef DEBUG | |
218 | printk("\n"); | |
219 | #endif | |
220 | flush_tlb_all(); | |
221 | ||
222 | return (void __iomem *)retaddr; | |
223 | } | |
224 | EXPORT_SYMBOL(__ioremap); | |
225 | ||
226 | /* | |
227 | * Unmap a ioremap()ed region again | |
228 | */ | |
229 | void iounmap(void __iomem *addr) | |
230 | { | |
231 | #ifdef CONFIG_AMIGA | |
232 | if ((!MACH_IS_AMIGA) || | |
233 | (((unsigned long)addr < 0x40000000) || | |
234 | ((unsigned long)addr > 0x60000000))) | |
235 | free_io_area((__force void *)addr); | |
236 | #else | |
237 | free_io_area((__force void *)addr); | |
238 | #endif | |
239 | } | |
240 | EXPORT_SYMBOL(iounmap); | |
241 | ||
242 | /* | |
243 | * __iounmap unmaps nearly everything, so be careful | |
244 | * it doesn't free currently pointer/page tables anymore but it | |
245 | * wans't used anyway and might be added later. | |
246 | */ | |
247 | void __iounmap(void *addr, unsigned long size) | |
248 | { | |
249 | unsigned long virtaddr = (unsigned long)addr; | |
250 | pgd_t *pgd_dir; | |
251 | pmd_t *pmd_dir; | |
252 | pte_t *pte_dir; | |
253 | ||
254 | while ((long)size > 0) { | |
255 | pgd_dir = pgd_offset_k(virtaddr); | |
256 | if (pgd_bad(*pgd_dir)) { | |
257 | printk("iounmap: bad pgd(%08lx)\n", pgd_val(*pgd_dir)); | |
258 | pgd_clear(pgd_dir); | |
259 | return; | |
260 | } | |
261 | pmd_dir = pmd_offset(pgd_dir, virtaddr); | |
262 | ||
263 | if (CPU_IS_020_OR_030) { | |
264 | int pmd_off = (virtaddr/PTRTREESIZE) & 15; | |
265 | int pmd_type = pmd_dir->pmd[pmd_off] & _DESCTYPE_MASK; | |
266 | ||
267 | if (pmd_type == _PAGE_PRESENT) { | |
268 | pmd_dir->pmd[pmd_off] = 0; | |
269 | virtaddr += PTRTREESIZE; | |
270 | size -= PTRTREESIZE; | |
271 | continue; | |
272 | } else if (pmd_type == 0) | |
273 | continue; | |
274 | } | |
275 | ||
276 | if (pmd_bad(*pmd_dir)) { | |
277 | printk("iounmap: bad pmd (%08lx)\n", pmd_val(*pmd_dir)); | |
278 | pmd_clear(pmd_dir); | |
279 | return; | |
280 | } | |
281 | pte_dir = pte_offset_kernel(pmd_dir, virtaddr); | |
282 | ||
283 | pte_val(*pte_dir) = 0; | |
284 | virtaddr += PAGE_SIZE; | |
285 | size -= PAGE_SIZE; | |
286 | } | |
287 | ||
288 | flush_tlb_all(); | |
289 | } | |
290 | ||
291 | /* | |
292 | * Set new cache mode for some kernel address space. | |
293 | * The caller must push data for that range itself, if such data may already | |
294 | * be in the cache. | |
295 | */ | |
296 | void kernel_set_cachemode(void *addr, unsigned long size, int cmode) | |
297 | { | |
298 | unsigned long virtaddr = (unsigned long)addr; | |
299 | pgd_t *pgd_dir; | |
300 | pmd_t *pmd_dir; | |
301 | pte_t *pte_dir; | |
302 | ||
303 | if (CPU_IS_040_OR_060) { | |
304 | switch (cmode) { | |
305 | case IOMAP_FULL_CACHING: | |
306 | cmode = _PAGE_CACHE040; | |
307 | break; | |
308 | case IOMAP_NOCACHE_SER: | |
309 | default: | |
310 | cmode = _PAGE_NOCACHE_S; | |
311 | break; | |
312 | case IOMAP_NOCACHE_NONSER: | |
313 | cmode = _PAGE_NOCACHE; | |
314 | break; | |
315 | case IOMAP_WRITETHROUGH: | |
316 | cmode = _PAGE_CACHE040W; | |
317 | break; | |
318 | } | |
319 | } else { | |
320 | switch (cmode) { | |
321 | case IOMAP_NOCACHE_SER: | |
322 | case IOMAP_NOCACHE_NONSER: | |
323 | default: | |
324 | cmode = _PAGE_NOCACHE030; | |
325 | break; | |
326 | case IOMAP_FULL_CACHING: | |
327 | case IOMAP_WRITETHROUGH: | |
328 | cmode = 0; | |
329 | } | |
330 | } | |
331 | ||
332 | while ((long)size > 0) { | |
333 | pgd_dir = pgd_offset_k(virtaddr); | |
334 | if (pgd_bad(*pgd_dir)) { | |
335 | printk("iocachemode: bad pgd(%08lx)\n", pgd_val(*pgd_dir)); | |
336 | pgd_clear(pgd_dir); | |
337 | return; | |
338 | } | |
339 | pmd_dir = pmd_offset(pgd_dir, virtaddr); | |
340 | ||
341 | if (CPU_IS_020_OR_030) { | |
342 | int pmd_off = (virtaddr/PTRTREESIZE) & 15; | |
343 | ||
344 | if ((pmd_dir->pmd[pmd_off] & _DESCTYPE_MASK) == _PAGE_PRESENT) { | |
345 | pmd_dir->pmd[pmd_off] = (pmd_dir->pmd[pmd_off] & | |
346 | _CACHEMASK040) | cmode; | |
347 | virtaddr += PTRTREESIZE; | |
348 | size -= PTRTREESIZE; | |
349 | continue; | |
350 | } | |
351 | } | |
352 | ||
353 | if (pmd_bad(*pmd_dir)) { | |
354 | printk("iocachemode: bad pmd (%08lx)\n", pmd_val(*pmd_dir)); | |
355 | pmd_clear(pmd_dir); | |
356 | return; | |
357 | } | |
358 | pte_dir = pte_offset_kernel(pmd_dir, virtaddr); | |
359 | ||
360 | pte_val(*pte_dir) = (pte_val(*pte_dir) & _CACHEMASK040) | cmode; | |
361 | virtaddr += PAGE_SIZE; | |
362 | size -= PAGE_SIZE; | |
363 | } | |
364 | ||
365 | flush_tlb_all(); | |
366 | } | |
367 | EXPORT_SYMBOL(kernel_set_cachemode); |