[PATCH] Don't export machine_restart, machine_halt, or machine_power_off.
[linux-2.6.git] / arch / m68k / sun3 / sun3dvma.c
1 /*
2  * linux/arch/m68k/mm/sun3dvma.c
3  *
4  * Copyright (C) 2000 Sam Creasey
5  *
6  * Contains common routines for sun3/sun3x DVMA management.
7  */
8
9 #include <linux/config.h>
10 #include <linux/kernel.h>
11 #include <linux/mm.h>
12 #include <linux/list.h>
13
14 #include <asm/page.h>
15 #include <asm/pgtable.h>
16 #include <asm/dvma.h>
17
18 #undef DVMA_DEBUG
19
20 #ifdef CONFIG_SUN3X
21 extern void dvma_unmap_iommu(unsigned long baddr, int len);
22 #else
23 static inline void dvma_unmap_iommu(unsigned long a, int b)
24 {
25 }
26 #endif
27
28 #ifdef CONFIG_SUN3
29 extern void sun3_dvma_init(void);
30 #endif
31
32 unsigned long iommu_use[IOMMU_TOTAL_ENTRIES];
33
34 #define dvma_index(baddr) ((baddr - DVMA_START) >> DVMA_PAGE_SHIFT)
35
36 #define dvma_entry_use(baddr)           (iommu_use[dvma_index(baddr)])
37
38 struct hole {
39         unsigned long start;
40         unsigned long end;
41         unsigned long size;
42         struct list_head list;
43 };
44
45 static struct list_head hole_list;
46 static struct list_head hole_cache;
47 static struct hole initholes[64];
48
49 #ifdef DVMA_DEBUG
50
51 static unsigned long dvma_allocs;
52 static unsigned long dvma_frees;
53 static unsigned long long dvma_alloc_bytes;
54 static unsigned long long dvma_free_bytes;
55
56 static void print_use(void)
57 {
58
59         int i;
60         int j = 0;
61
62         printk("dvma entry usage:\n");
63
64         for(i = 0; i < IOMMU_TOTAL_ENTRIES; i++) {
65                 if(!iommu_use[i])
66                         continue;
67
68                 j++;
69
70                 printk("dvma entry: %08lx len %08lx\n",
71                        ( i << DVMA_PAGE_SHIFT) + DVMA_START,
72                        iommu_use[i]);
73         }
74
75         printk("%d entries in use total\n", j);
76
77         printk("allocation/free calls: %lu/%lu\n", dvma_allocs, dvma_frees);
78         printk("allocation/free bytes: %Lx/%Lx\n", dvma_alloc_bytes,
79                dvma_free_bytes);
80 }
81
82 static void print_holes(struct list_head *holes)
83 {
84
85         struct list_head *cur;
86         struct hole *hole;
87
88         printk("listing dvma holes\n");
89         list_for_each(cur, holes) {
90                 hole = list_entry(cur, struct hole, list);
91
92                 if((hole->start == 0) && (hole->end == 0) && (hole->size == 0))
93                         continue;
94
95                 printk("hole: start %08lx end %08lx size %08lx\n", hole->start, hole->end, hole->size);
96         }
97
98         printk("end of hole listing...\n");
99
100 }
101 #endif /* DVMA_DEBUG */
102
103 static inline int refill(void)
104 {
105
106         struct hole *hole;
107         struct hole *prev = NULL;
108         struct list_head *cur;
109         int ret = 0;
110
111         list_for_each(cur, &hole_list) {
112                 hole = list_entry(cur, struct hole, list);
113
114                 if(!prev) {
115                         prev = hole;
116                         continue;
117                 }
118
119                 if(hole->end == prev->start) {
120                         hole->size += prev->size;
121                         hole->end = prev->end;
122                         list_del(&(prev->list));
123                         list_add(&(prev->list), &hole_cache);
124                         ret++;
125                 }
126
127         }
128
129         return ret;
130 }
131
132 static inline struct hole *rmcache(void)
133 {
134         struct hole *ret;
135
136         if(list_empty(&hole_cache)) {
137                 if(!refill()) {
138                         printk("out of dvma hole cache!\n");
139                         BUG();
140                 }
141         }
142
143         ret = list_entry(hole_cache.next, struct hole, list);
144         list_del(&(ret->list));
145
146         return ret;
147
148 }
149
150 static inline unsigned long get_baddr(int len, unsigned long align)
151 {
152
153         struct list_head *cur;
154         struct hole *hole;
155
156         if(list_empty(&hole_list)) {
157 #ifdef DVMA_DEBUG
158                 printk("out of dvma holes! (printing hole cache)\n");
159                 print_holes(&hole_cache);
160                 print_use();
161 #endif
162                 BUG();
163         }
164
165         list_for_each(cur, &hole_list) {
166                 unsigned long newlen;
167
168                 hole = list_entry(cur, struct hole, list);
169
170                 if(align > DVMA_PAGE_SIZE)
171                         newlen = len + ((hole->end - len) & (align-1));
172                 else
173                         newlen = len;
174
175                 if(hole->size > newlen) {
176                         hole->end -= newlen;
177                         hole->size -= newlen;
178                         dvma_entry_use(hole->end) = newlen;
179 #ifdef DVMA_DEBUG
180                         dvma_allocs++;
181                         dvma_alloc_bytes += newlen;
182 #endif
183                         return hole->end;
184                 } else if(hole->size == newlen) {
185                         list_del(&(hole->list));
186                         list_add(&(hole->list), &hole_cache);
187                         dvma_entry_use(hole->start) = newlen;
188 #ifdef DVMA_DEBUG
189                         dvma_allocs++;
190                         dvma_alloc_bytes += newlen;
191 #endif
192                         return hole->start;
193                 }
194
195         }
196
197         printk("unable to find dvma hole!\n");
198         BUG();
199         return 0;
200 }
201
202 static inline int free_baddr(unsigned long baddr)
203 {
204
205         unsigned long len;
206         struct hole *hole;
207         struct list_head *cur;
208         unsigned long orig_baddr;
209
210         orig_baddr = baddr;
211         len = dvma_entry_use(baddr);
212         dvma_entry_use(baddr) = 0;
213         baddr &= DVMA_PAGE_MASK;
214         dvma_unmap_iommu(baddr, len);
215
216 #ifdef DVMA_DEBUG
217         dvma_frees++;
218         dvma_free_bytes += len;
219 #endif
220
221         list_for_each(cur, &hole_list) {
222                 hole = list_entry(cur, struct hole, list);
223
224                 if(hole->end == baddr) {
225                         hole->end += len;
226                         hole->size += len;
227                         return 0;
228                 } else if(hole->start == (baddr + len)) {
229                         hole->start = baddr;
230                         hole->size += len;
231                         return 0;
232                 }
233
234         }
235
236         hole = rmcache();
237
238         hole->start = baddr;
239         hole->end = baddr + len;
240         hole->size = len;
241
242 //      list_add_tail(&(hole->list), cur);
243         list_add(&(hole->list), cur);
244
245         return 0;
246
247 }
248
249 void dvma_init(void)
250 {
251
252         struct hole *hole;
253         int i;
254
255         INIT_LIST_HEAD(&hole_list);
256         INIT_LIST_HEAD(&hole_cache);
257
258         /* prepare the hole cache */
259         for(i = 0; i < 64; i++)
260                 list_add(&(initholes[i].list), &hole_cache);
261
262         hole = rmcache();
263         hole->start = DVMA_START;
264         hole->end = DVMA_END;
265         hole->size = DVMA_SIZE;
266
267         list_add(&(hole->list), &hole_list);
268
269         memset(iommu_use, 0, sizeof(iommu_use));
270
271         dvma_unmap_iommu(DVMA_START, DVMA_SIZE);
272
273 #ifdef CONFIG_SUN3
274         sun3_dvma_init();
275 #endif
276
277 }
278
279 inline unsigned long dvma_map_align(unsigned long kaddr, int len, int align)
280 {
281
282         unsigned long baddr;
283         unsigned long off;
284
285         if(!len)
286                 len = 0x800;
287
288         if(!kaddr || !len) {
289 //              printk("error: kaddr %lx len %x\n", kaddr, len);
290 //              *(int *)4 = 0;
291                 return 0;
292         }
293
294 #ifdef DEBUG
295         printk("dvma_map request %08lx bytes from %08lx\n",
296                len, kaddr);
297 #endif
298         off = kaddr & ~DVMA_PAGE_MASK;
299         kaddr &= PAGE_MASK;
300         len += off;
301         len = ((len + (DVMA_PAGE_SIZE-1)) & DVMA_PAGE_MASK);
302
303         if(align == 0)
304                 align = DVMA_PAGE_SIZE;
305         else
306                 align = ((align + (DVMA_PAGE_SIZE-1)) & DVMA_PAGE_MASK);
307
308         baddr = get_baddr(len, align);
309 //      printk("using baddr %lx\n", baddr);
310
311         if(!dvma_map_iommu(kaddr, baddr, len))
312                 return (baddr + off);
313
314         printk("dvma_map failed kaddr %lx baddr %lx len %x\n", kaddr, baddr, len);
315         BUG();
316         return 0;
317 }
318
319 void dvma_unmap(void *baddr)
320 {
321         unsigned long addr;
322
323         addr = (unsigned long)baddr;
324         /* check if this is a vme mapping */
325         if(!(addr & 0x00f00000))
326                 addr |= 0xf00000;
327
328         free_baddr(addr);
329
330         return;
331
332 }
333
334
335 void *dvma_malloc_align(unsigned long len, unsigned long align)
336 {
337         unsigned long kaddr;
338         unsigned long baddr;
339         unsigned long vaddr;
340
341         if(!len)
342                 return NULL;
343
344 #ifdef DEBUG
345         printk("dvma_malloc request %lx bytes\n", len);
346 #endif
347         len = ((len + (DVMA_PAGE_SIZE-1)) & DVMA_PAGE_MASK);
348
349         if((kaddr = __get_free_pages(GFP_ATOMIC, get_order(len))) == 0)
350                 return NULL;
351
352         if((baddr = (unsigned long)dvma_map_align(kaddr, len, align)) == 0) {
353                 free_pages(kaddr, get_order(len));
354                 return NULL;
355         }
356
357         vaddr = dvma_btov(baddr);
358
359         if(dvma_map_cpu(kaddr, vaddr, len) < 0) {
360                 dvma_unmap((void *)baddr);
361                 free_pages(kaddr, get_order(len));
362                 return NULL;
363         }
364
365 #ifdef DEBUG
366         printk("mapped %08lx bytes %08lx kern -> %08lx bus\n",
367                len, kaddr, baddr);
368 #endif
369
370         return (void *)vaddr;
371
372 }
373
374 void dvma_free(void *vaddr)
375 {
376
377         return;
378
379 }