1
2
3
4
5
6
7
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>
23
24#undef DEBUG
25
26#define PTRTREESIZE (256*1024)
27
28
29
30
31
32
33
34
35#ifdef CPU_M68040_OR_M68060_ONLY
36
37#define IO_SIZE PAGE_SIZE
38
39static inline struct vm_struct *get_io_area(unsigned long size)
40{
41 return get_vm_area(size, VM_IOREMAP);
42}
43
44
45static inline void free_io_area(void *addr)
46{
47 vfree((void *)(PAGE_MASK & (unsigned long)addr));
48}
49
50#else
51
52#define IO_SIZE (256*1024)
53
54static struct vm_struct *iolist;
55
56static 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
81static 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
98#endif
99
100
101
102
103
104
105void __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
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
133
134 offset = physaddr & (IO_SIZE - 1);
135 physaddr &= -IO_SIZE;
136 size = (size + offset + IO_SIZE - 1) & -IO_SIZE;
137
138
139
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
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 {
173 physaddr |= (_PAGE_PRESENT | _PAGE_ACCESSED |
174 _PAGE_DIRTY | _PAGE_READWRITE);
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}
224EXPORT_SYMBOL(__ioremap);
225
226
227
228
229void 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}
240EXPORT_SYMBOL(iounmap);
241
242
243
244
245
246
247void __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
293
294
295
296void 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}
367EXPORT_SYMBOL(kernel_set_cachemode);
368
