1
2
3
4
5
6
7
8
9
10
11#include <linux/module.h>
12#include <linux/mm.h>
13#include <linux/kernel.h>
14#include <linux/string.h>
15#include <linux/types.h>
16#include <linux/slab.h>
17#include <linux/vmalloc.h>
18
19#include <asm/setup.h>
20#include <asm/segment.h>
21#include <asm/page.h>
22#include <asm/pgalloc.h>
23#include <asm/io.h>
24
25#undef DEBUG
26
27#define PTRTREESIZE (256*1024)
28
29
30
31
32
33
34
35
36#ifdef CPU_M68040_OR_M68060_ONLY
37
38#define IO_SIZE PAGE_SIZE
39
40static inline struct vm_struct *get_io_area(unsigned long size)
41{
42 return get_vm_area(size, VM_IOREMAP);
43}
44
45
46static inline void free_io_area(void *addr)
47{
48 vfree((void *)(PAGE_MASK & (unsigned long)addr));
49}
50
51#else
52
53#define IO_SIZE (256*1024)
54
55static struct vm_struct *iolist;
56
57static struct vm_struct *get_io_area(unsigned long size)
58{
59 unsigned long addr;
60 struct vm_struct **p, *tmp, *area;
61
62 area = kmalloc(sizeof(*area), GFP_KERNEL);
63 if (!area)
64 return NULL;
65 addr = KMAP_START;
66 for (p = &iolist; (tmp = *p) ; p = &tmp->next) {
67 if (size + addr < (unsigned long)tmp->addr)
68 break;
69 if (addr > KMAP_END-size) {
70 kfree(area);
71 return NULL;
72 }
73 addr = tmp->size + (unsigned long)tmp->addr;
74 }
75 area->addr = (void *)addr;
76 area->size = size + IO_SIZE;
77 area->next = *p;
78 *p = area;
79 return area;
80}
81
82static inline void free_io_area(void *addr)
83{
84 struct vm_struct **p, *tmp;
85
86 if (!addr)
87 return;
88 addr = (void *)((unsigned long)addr & -IO_SIZE);
89 for (p = &iolist ; (tmp = *p) ; p = &tmp->next) {
90 if (tmp->addr == addr) {
91 *p = tmp->next;
92 __iounmap(tmp->addr, tmp->size);
93 kfree(tmp);
94 return;
95 }
96 }
97}
98
99#endif
100
101
102
103
104
105
106void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag)
107{
108 struct vm_struct *area;
109 unsigned long virtaddr, retaddr;
110 long offset;
111 pgd_t *pgd_dir;
112 pmd_t *pmd_dir;
113 pte_t *pte_dir;
114
115
116
117
118 if (!size || physaddr > (unsigned long)(-size))
119 return NULL;
120
121#ifdef CONFIG_AMIGA
122 if (MACH_IS_AMIGA) {
123 if ((physaddr >= 0x40000000) && (physaddr + size < 0x60000000)
124 && (cacheflag == IOMAP_NOCACHE_SER))
125 return (void __iomem *)physaddr;
126 }
127#endif
128
129#ifdef DEBUG
130 printk("ioremap: 0x%lx,0x%lx(%d) - ", physaddr, size, cacheflag);
131#endif
132
133
134
135 offset = physaddr & (IO_SIZE - 1);
136 physaddr &= -IO_SIZE;
137 size = (size + offset + IO_SIZE - 1) & -IO_SIZE;
138
139
140
141
142 area = get_io_area(size);
143 if (!area)
144 return NULL;
145
146 virtaddr = (unsigned long)area->addr;
147 retaddr = virtaddr + offset;
148#ifdef DEBUG
149 printk("0x%lx,0x%lx,0x%lx", physaddr, virtaddr, retaddr);
150#endif
151
152
153
154
155 if (CPU_IS_040_OR_060) {
156 physaddr |= (_PAGE_PRESENT | _PAGE_GLOBAL040 |
157 _PAGE_ACCESSED | _PAGE_DIRTY);
158 switch (cacheflag) {
159 case IOMAP_FULL_CACHING:
160 physaddr |= _PAGE_CACHE040;
161 break;
162 case IOMAP_NOCACHE_SER:
163 default:
164 physaddr |= _PAGE_NOCACHE_S;
165 break;
166 case IOMAP_NOCACHE_NONSER:
167 physaddr |= _PAGE_NOCACHE;
168 break;
169 case IOMAP_WRITETHROUGH:
170 physaddr |= _PAGE_CACHE040W;
171 break;
172 }
173 } else {
174 physaddr |= (_PAGE_PRESENT | _PAGE_ACCESSED |
175 _PAGE_DIRTY | _PAGE_READWRITE);
176 switch (cacheflag) {
177 case IOMAP_NOCACHE_SER:
178 case IOMAP_NOCACHE_NONSER:
179 default:
180 physaddr |= _PAGE_NOCACHE030;
181 break;
182 case IOMAP_FULL_CACHING:
183 case IOMAP_WRITETHROUGH:
184 break;
185 }
186 }
187
188 while ((long)size > 0) {
189#ifdef DEBUG
190 if (!(virtaddr & (PTRTREESIZE-1)))
191 printk ("\npa=%#lx va=%#lx ", physaddr, virtaddr);
192#endif
193 pgd_dir = pgd_offset_k(virtaddr);
194 pmd_dir = pmd_alloc(&init_mm, pgd_dir, virtaddr);
195 if (!pmd_dir) {
196 printk("ioremap: no mem for pmd_dir\n");
197 return NULL;
198 }
199
200 if (CPU_IS_020_OR_030) {
201 pmd_dir->pmd[(virtaddr/PTRTREESIZE) & 15] = physaddr;
202 physaddr += PTRTREESIZE;
203 virtaddr += PTRTREESIZE;
204 size -= PTRTREESIZE;
205 } else {
206 pte_dir = pte_alloc_kernel(pmd_dir, virtaddr);
207 if (!pte_dir) {
208 printk("ioremap: no mem for pte_dir\n");
209 return NULL;
210 }
211
212 pte_val(*pte_dir) = physaddr;
213 virtaddr += PAGE_SIZE;
214 physaddr += PAGE_SIZE;
215 size -= PAGE_SIZE;
216 }
217 }
218#ifdef DEBUG
219 printk("\n");
220#endif
221 flush_tlb_all();
222
223 return (void __iomem *)retaddr;
224}
225EXPORT_SYMBOL(__ioremap);
226
227
228
229
230void iounmap(void __iomem *addr)
231{
232#ifdef CONFIG_AMIGA
233 if ((!MACH_IS_AMIGA) ||
234 (((unsigned long)addr < 0x40000000) ||
235 ((unsigned long)addr > 0x60000000)))
236 free_io_area((__force void *)addr);
237#else
238 free_io_area((__force void *)addr);
239#endif
240}
241EXPORT_SYMBOL(iounmap);
242
243
244
245
246
247
248void __iounmap(void *addr, unsigned long size)
249{
250 unsigned long virtaddr = (unsigned long)addr;
251 pgd_t *pgd_dir;
252 pmd_t *pmd_dir;
253 pte_t *pte_dir;
254
255 while ((long)size > 0) {
256 pgd_dir = pgd_offset_k(virtaddr);
257 if (pgd_bad(*pgd_dir)) {
258 printk("iounmap: bad pgd(%08lx)\n", pgd_val(*pgd_dir));
259 pgd_clear(pgd_dir);
260 return;
261 }
262 pmd_dir = pmd_offset(pgd_dir, virtaddr);
263
264 if (CPU_IS_020_OR_030) {
265 int pmd_off = (virtaddr/PTRTREESIZE) & 15;
266 int pmd_type = pmd_dir->pmd[pmd_off] & _DESCTYPE_MASK;
267
268 if (pmd_type == _PAGE_PRESENT) {
269 pmd_dir->pmd[pmd_off] = 0;
270 virtaddr += PTRTREESIZE;
271 size -= PTRTREESIZE;
272 continue;
273 } else if (pmd_type == 0)
274 continue;
275 }
276
277 if (pmd_bad(*pmd_dir)) {
278 printk("iounmap: bad pmd (%08lx)\n", pmd_val(*pmd_dir));
279 pmd_clear(pmd_dir);
280 return;
281 }
282 pte_dir = pte_offset_kernel(pmd_dir, virtaddr);
283
284 pte_val(*pte_dir) = 0;
285 virtaddr += PAGE_SIZE;
286 size -= PAGE_SIZE;
287 }
288
289 flush_tlb_all();
290}
291
292
293
294
295
296
297void kernel_set_cachemode(void *addr, unsigned long size, int cmode)
298{
299 unsigned long virtaddr = (unsigned long)addr;
300 pgd_t *pgd_dir;
301 pmd_t *pmd_dir;
302 pte_t *pte_dir;
303
304 if (CPU_IS_040_OR_060) {
305 switch (cmode) {
306 case IOMAP_FULL_CACHING:
307 cmode = _PAGE_CACHE040;
308 break;
309 case IOMAP_NOCACHE_SER:
310 default:
311 cmode = _PAGE_NOCACHE_S;
312 break;
313 case IOMAP_NOCACHE_NONSER:
314 cmode = _PAGE_NOCACHE;
315 break;
316 case IOMAP_WRITETHROUGH:
317 cmode = _PAGE_CACHE040W;
318 break;
319 }
320 } else {
321 switch (cmode) {
322 case IOMAP_NOCACHE_SER:
323 case IOMAP_NOCACHE_NONSER:
324 default:
325 cmode = _PAGE_NOCACHE030;
326 break;
327 case IOMAP_FULL_CACHING:
328 case IOMAP_WRITETHROUGH:
329 cmode = 0;
330 }
331 }
332
333 while ((long)size > 0) {
334 pgd_dir = pgd_offset_k(virtaddr);
335 if (pgd_bad(*pgd_dir)) {
336 printk("iocachemode: bad pgd(%08lx)\n", pgd_val(*pgd_dir));
337 pgd_clear(pgd_dir);
338 return;
339 }
340 pmd_dir = pmd_offset(pgd_dir, virtaddr);
341
342 if (CPU_IS_020_OR_030) {
343 int pmd_off = (virtaddr/PTRTREESIZE) & 15;
344
345 if ((pmd_dir->pmd[pmd_off] & _DESCTYPE_MASK) == _PAGE_PRESENT) {
346 pmd_dir->pmd[pmd_off] = (pmd_dir->pmd[pmd_off] &
347 _CACHEMASK040) | cmode;
348 virtaddr += PTRTREESIZE;
349 size -= PTRTREESIZE;
350 continue;
351 }
352 }
353
354 if (pmd_bad(*pmd_dir)) {
355 printk("iocachemode: bad pmd (%08lx)\n", pmd_val(*pmd_dir));
356 pmd_clear(pmd_dir);
357 return;
358 }
359 pte_dir = pte_offset_kernel(pmd_dir, virtaddr);
360
361 pte_val(*pte_dir) = (pte_val(*pte_dir) & _CACHEMASK040) | cmode;
362 virtaddr += PAGE_SIZE;
363 size -= PAGE_SIZE;
364 }
365
366 flush_tlb_all();
367}
368EXPORT_SYMBOL(kernel_set_cachemode);
369
