]> err.no Git - linux-2.6/blob - drivers/pnp/manager.c
Merge branch 'for-2.6.26' of master.kernel.org:/pub/scm/linux/kernel/git/jwboyer...
[linux-2.6] / drivers / pnp / manager.c
1 /*
2  * manager.c - Resource Management, Conflict Resolution, Activation and Disabling of Devices
3  *
4  * based on isapnp.c resource management (c) Jaroslav Kysela <perex@perex.cz>
5  * Copyright 2003 Adam Belay <ambx1@neo.rr.com>
6  */
7
8 #include <linux/errno.h>
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/kernel.h>
12 #include <linux/pnp.h>
13 #include <linux/slab.h>
14 #include <linux/bitmap.h>
15 #include <linux/mutex.h>
16 #include "base.h"
17
18 DEFINE_MUTEX(pnp_res_mutex);
19
20 static int pnp_assign_port(struct pnp_dev *dev, struct pnp_port *rule, int idx)
21 {
22         struct pnp_resource *pnp_res;
23         struct resource *res;
24
25         pnp_res = pnp_get_pnp_resource(dev, IORESOURCE_IO, idx);
26         if (!pnp_res) {
27                 dev_err(&dev->dev, "too many I/O port resources\n");
28                 /* pretend we were successful so at least the manager won't try again */
29                 return 1;
30         }
31
32         res = &pnp_res->res;
33
34         /* check if this resource has been manually set, if so skip */
35         if (!(res->flags & IORESOURCE_AUTO)) {
36                 dev_dbg(&dev->dev, "  io %d already set to %#llx-%#llx "
37                         "flags %#lx\n", idx, (unsigned long long) res->start,
38                         (unsigned long long) res->end, res->flags);
39                 return 1;
40         }
41
42         /* set the initial values */
43         pnp_res->index = idx;
44         res->flags |= rule->flags | IORESOURCE_IO;
45         res->flags &= ~IORESOURCE_UNSET;
46
47         if (!rule->size) {
48                 res->flags |= IORESOURCE_DISABLED;
49                 dev_dbg(&dev->dev, "  io %d disabled\n", idx);
50                 return 1;       /* skip disabled resource requests */
51         }
52
53         res->start = rule->min;
54         res->end = res->start + rule->size - 1;
55
56         /* run through until pnp_check_port is happy */
57         while (!pnp_check_port(dev, res)) {
58                 res->start += rule->align;
59                 res->end = res->start + rule->size - 1;
60                 if (res->start > rule->max || !rule->align) {
61                         dev_dbg(&dev->dev, "  couldn't assign io %d\n", idx);
62                         return 0;
63                 }
64         }
65         dev_dbg(&dev->dev, "  assign io  %d %#llx-%#llx\n", idx,
66                 (unsigned long long) res->start, (unsigned long long) res->end);
67         return 1;
68 }
69
70 static int pnp_assign_mem(struct pnp_dev *dev, struct pnp_mem *rule, int idx)
71 {
72         struct pnp_resource *pnp_res;
73         struct resource *res;
74
75         pnp_res = pnp_get_pnp_resource(dev, IORESOURCE_MEM, idx);
76         if (!pnp_res) {
77                 dev_err(&dev->dev, "too many memory resources\n");
78                 /* pretend we were successful so at least the manager won't try again */
79                 return 1;
80         }
81
82         res = &pnp_res->res;
83
84         /* check if this resource has been manually set, if so skip */
85         if (!(res->flags & IORESOURCE_AUTO)) {
86                 dev_dbg(&dev->dev, "  mem %d already set to %#llx-%#llx "
87                         "flags %#lx\n", idx, (unsigned long long) res->start,
88                         (unsigned long long) res->end, res->flags);
89                 return 1;
90         }
91
92         /* set the initial values */
93         pnp_res->index = idx;
94         res->flags |= rule->flags | IORESOURCE_MEM;
95         res->flags &= ~IORESOURCE_UNSET;
96
97         /* convert pnp flags to standard Linux flags */
98         if (!(rule->flags & IORESOURCE_MEM_WRITEABLE))
99                 res->flags |= IORESOURCE_READONLY;
100         if (rule->flags & IORESOURCE_MEM_CACHEABLE)
101                 res->flags |= IORESOURCE_CACHEABLE;
102         if (rule->flags & IORESOURCE_MEM_RANGELENGTH)
103                 res->flags |= IORESOURCE_RANGELENGTH;
104         if (rule->flags & IORESOURCE_MEM_SHADOWABLE)
105                 res->flags |= IORESOURCE_SHADOWABLE;
106
107         if (!rule->size) {
108                 res->flags |= IORESOURCE_DISABLED;
109                 dev_dbg(&dev->dev, "  mem %d disabled\n", idx);
110                 return 1;       /* skip disabled resource requests */
111         }
112
113         res->start = rule->min;
114         res->end = res->start + rule->size - 1;
115
116         /* run through until pnp_check_mem is happy */
117         while (!pnp_check_mem(dev, res)) {
118                 res->start += rule->align;
119                 res->end = res->start + rule->size - 1;
120                 if (res->start > rule->max || !rule->align) {
121                         dev_dbg(&dev->dev, "  couldn't assign mem %d\n", idx);
122                         return 0;
123                 }
124         }
125         dev_dbg(&dev->dev, "  assign mem %d %#llx-%#llx\n", idx,
126                 (unsigned long long) res->start, (unsigned long long) res->end);
127         return 1;
128 }
129
130 static int pnp_assign_irq(struct pnp_dev *dev, struct pnp_irq *rule, int idx)
131 {
132         struct pnp_resource *pnp_res;
133         struct resource *res;
134         int i;
135
136         /* IRQ priority: this table is good for i386 */
137         static unsigned short xtab[16] = {
138                 5, 10, 11, 12, 9, 14, 15, 7, 3, 4, 13, 0, 1, 6, 8, 2
139         };
140
141         pnp_res = pnp_get_pnp_resource(dev, IORESOURCE_IRQ, idx);
142         if (!pnp_res) {
143                 dev_err(&dev->dev, "too many IRQ resources\n");
144                 /* pretend we were successful so at least the manager won't try again */
145                 return 1;
146         }
147
148         res = &pnp_res->res;
149
150         /* check if this resource has been manually set, if so skip */
151         if (!(res->flags & IORESOURCE_AUTO)) {
152                 dev_dbg(&dev->dev, "  irq %d already set to %d flags %#lx\n",
153                         idx, (int) res->start, res->flags);
154                 return 1;
155         }
156
157         /* set the initial values */
158         pnp_res->index = idx;
159         res->flags |= rule->flags | IORESOURCE_IRQ;
160         res->flags &= ~IORESOURCE_UNSET;
161
162         if (bitmap_empty(rule->map, PNP_IRQ_NR)) {
163                 res->flags |= IORESOURCE_DISABLED;
164                 dev_dbg(&dev->dev, "  irq %d disabled\n", idx);
165                 return 1;       /* skip disabled resource requests */
166         }
167
168         /* TBD: need check for >16 IRQ */
169         res->start = find_next_bit(rule->map, PNP_IRQ_NR, 16);
170         if (res->start < PNP_IRQ_NR) {
171                 res->end = res->start;
172                 dev_dbg(&dev->dev, "  assign irq %d %d\n", idx,
173                         (int) res->start);
174                 return 1;
175         }
176         for (i = 0; i < 16; i++) {
177                 if (test_bit(xtab[i], rule->map)) {
178                         res->start = res->end = xtab[i];
179                         if (pnp_check_irq(dev, res)) {
180                                 dev_dbg(&dev->dev, "  assign irq %d %d\n", idx,
181                                         (int) res->start);
182                                 return 1;
183                         }
184                 }
185         }
186         dev_dbg(&dev->dev, "  couldn't assign irq %d\n", idx);
187         return 0;
188 }
189
190 static void pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx)
191 {
192         struct pnp_resource *pnp_res;
193         struct resource *res;
194         int i;
195
196         /* DMA priority: this table is good for i386 */
197         static unsigned short xtab[8] = {
198                 1, 3, 5, 6, 7, 0, 2, 4
199         };
200
201         pnp_res = pnp_get_pnp_resource(dev, IORESOURCE_DMA, idx);
202         if (!pnp_res) {
203                 dev_err(&dev->dev, "too many DMA resources\n");
204                 return;
205         }
206
207         res = &pnp_res->res;
208
209         /* check if this resource has been manually set, if so skip */
210         if (!(res->flags & IORESOURCE_AUTO)) {
211                 dev_dbg(&dev->dev, "  dma %d already set to %d flags %#lx\n",
212                         idx, (int) res->start, res->flags);
213                 return;
214         }
215
216         /* set the initial values */
217         pnp_res->index = idx;
218         res->flags |= rule->flags | IORESOURCE_DMA;
219         res->flags &= ~IORESOURCE_UNSET;
220
221         for (i = 0; i < 8; i++) {
222                 if (rule->map & (1 << xtab[i])) {
223                         res->start = res->end = xtab[i];
224                         if (pnp_check_dma(dev, res)) {
225                                 dev_dbg(&dev->dev, "  assign dma %d %d\n", idx,
226                                         (int) res->start);
227                                 return;
228                         }
229                 }
230         }
231 #ifdef MAX_DMA_CHANNELS
232         res->start = res->end = MAX_DMA_CHANNELS;
233 #endif
234         res->flags |= IORESOURCE_UNSET | IORESOURCE_DISABLED;
235         dev_dbg(&dev->dev, "  disable dma %d\n", idx);
236 }
237
238 void pnp_init_resource(struct resource *res)
239 {
240         unsigned long type;
241
242         type = res->flags & (IORESOURCE_IO  | IORESOURCE_MEM |
243                              IORESOURCE_IRQ | IORESOURCE_DMA);
244
245         res->name = NULL;
246         res->flags = type | IORESOURCE_AUTO | IORESOURCE_UNSET;
247         if (type == IORESOURCE_IRQ || type == IORESOURCE_DMA) {
248                 res->start = -1;
249                 res->end = -1;
250         } else {
251                 res->start = 0;
252                 res->end = 0;
253         }
254 }
255
256 /**
257  * pnp_init_resources - Resets a resource table to default values.
258  * @table: pointer to the desired resource table
259  */
260 void pnp_init_resources(struct pnp_dev *dev)
261 {
262         struct resource *res;
263         int idx;
264
265         for (idx = 0; idx < PNP_MAX_IRQ; idx++) {
266                 res = &dev->res->irq[idx].res;
267                 res->flags = IORESOURCE_IRQ;
268                 pnp_init_resource(res);
269         }
270         for (idx = 0; idx < PNP_MAX_DMA; idx++) {
271                 res = &dev->res->dma[idx].res;
272                 res->flags = IORESOURCE_DMA;
273                 pnp_init_resource(res);
274         }
275         for (idx = 0; idx < PNP_MAX_PORT; idx++) {
276                 res = &dev->res->port[idx].res;
277                 res->flags = IORESOURCE_IO;
278                 pnp_init_resource(res);
279         }
280         for (idx = 0; idx < PNP_MAX_MEM; idx++) {
281                 res = &dev->res->mem[idx].res;
282                 res->flags = IORESOURCE_MEM;
283                 pnp_init_resource(res);
284         }
285 }
286
287 /**
288  * pnp_clean_resources - clears resources that were not manually set
289  * @res: the resources to clean
290  */
291 static void pnp_clean_resource_table(struct pnp_dev *dev)
292 {
293         struct resource *res;
294         int idx;
295
296         for (idx = 0; idx < PNP_MAX_IRQ; idx++) {
297                 res = &dev->res->irq[idx].res;
298                 if (res->flags & IORESOURCE_AUTO) {
299                         res->flags = IORESOURCE_IRQ;
300                         pnp_init_resource(res);
301                 }
302         }
303         for (idx = 0; idx < PNP_MAX_DMA; idx++) {
304                 res = &dev->res->dma[idx].res;
305                 if (res->flags & IORESOURCE_AUTO) {
306                         res->flags = IORESOURCE_DMA;
307                         pnp_init_resource(res);
308                 }
309         }
310         for (idx = 0; idx < PNP_MAX_PORT; idx++) {
311                 res = &dev->res->port[idx].res;
312                 if (res->flags & IORESOURCE_AUTO) {
313                         res->flags = IORESOURCE_IO;
314                         pnp_init_resource(res);
315                 }
316         }
317         for (idx = 0; idx < PNP_MAX_MEM; idx++) {
318                 res = &dev->res->mem[idx].res;
319                 if (res->flags & IORESOURCE_AUTO) {
320                         res->flags = IORESOURCE_MEM;
321                         pnp_init_resource(res);
322                 }
323         }
324 }
325
326 /**
327  * pnp_assign_resources - assigns resources to the device based on the specified dependent number
328  * @dev: pointer to the desired device
329  * @depnum: the dependent function number
330  *
331  * Only set depnum to 0 if the device does not have dependent options.
332  */
333 static int pnp_assign_resources(struct pnp_dev *dev, int depnum)
334 {
335         struct pnp_port *port;
336         struct pnp_mem *mem;
337         struct pnp_irq *irq;
338         struct pnp_dma *dma;
339         int nport = 0, nmem = 0, nirq = 0, ndma = 0;
340
341         if (!pnp_can_configure(dev))
342                 return -ENODEV;
343
344         dbg_pnp_show_resources(dev, "before pnp_assign_resources");
345         mutex_lock(&pnp_res_mutex);
346         pnp_clean_resource_table(dev);
347         if (dev->independent) {
348                 dev_dbg(&dev->dev, "assigning independent options\n");
349                 port = dev->independent->port;
350                 mem = dev->independent->mem;
351                 irq = dev->independent->irq;
352                 dma = dev->independent->dma;
353                 while (port) {
354                         if (!pnp_assign_port(dev, port, nport))
355                                 goto fail;
356                         nport++;
357                         port = port->next;
358                 }
359                 while (mem) {
360                         if (!pnp_assign_mem(dev, mem, nmem))
361                                 goto fail;
362                         nmem++;
363                         mem = mem->next;
364                 }
365                 while (irq) {
366                         if (!pnp_assign_irq(dev, irq, nirq))
367                                 goto fail;
368                         nirq++;
369                         irq = irq->next;
370                 }
371                 while (dma) {
372                         pnp_assign_dma(dev, dma, ndma);
373                         ndma++;
374                         dma = dma->next;
375                 }
376         }
377
378         if (depnum) {
379                 struct pnp_option *dep;
380                 int i;
381
382                 dev_dbg(&dev->dev, "assigning dependent option %d\n", depnum);
383                 for (i = 1, dep = dev->dependent; i < depnum;
384                      i++, dep = dep->next)
385                         if (!dep)
386                                 goto fail;
387                 port = dep->port;
388                 mem = dep->mem;
389                 irq = dep->irq;
390                 dma = dep->dma;
391                 while (port) {
392                         if (!pnp_assign_port(dev, port, nport))
393                                 goto fail;
394                         nport++;
395                         port = port->next;
396                 }
397                 while (mem) {
398                         if (!pnp_assign_mem(dev, mem, nmem))
399                                 goto fail;
400                         nmem++;
401                         mem = mem->next;
402                 }
403                 while (irq) {
404                         if (!pnp_assign_irq(dev, irq, nirq))
405                                 goto fail;
406                         nirq++;
407                         irq = irq->next;
408                 }
409                 while (dma) {
410                         pnp_assign_dma(dev, dma, ndma);
411                         ndma++;
412                         dma = dma->next;
413                 }
414         } else if (dev->dependent)
415                 goto fail;
416
417         mutex_unlock(&pnp_res_mutex);
418         dbg_pnp_show_resources(dev, "after pnp_assign_resources");
419         return 1;
420
421 fail:
422         pnp_clean_resource_table(dev);
423         mutex_unlock(&pnp_res_mutex);
424         dbg_pnp_show_resources(dev, "after pnp_assign_resources (failed)");
425         return 0;
426 }
427
428 /**
429  * pnp_auto_config_dev - automatically assigns resources to a device
430  * @dev: pointer to the desired device
431  */
432 int pnp_auto_config_dev(struct pnp_dev *dev)
433 {
434         struct pnp_option *dep;
435         int i = 1;
436
437         if (!pnp_can_configure(dev)) {
438                 dev_dbg(&dev->dev, "configuration not supported\n");
439                 return -ENODEV;
440         }
441
442         if (!dev->dependent) {
443                 if (pnp_assign_resources(dev, 0))
444                         return 0;
445         } else {
446                 dep = dev->dependent;
447                 do {
448                         if (pnp_assign_resources(dev, i))
449                                 return 0;
450                         dep = dep->next;
451                         i++;
452                 } while (dep);
453         }
454
455         dev_err(&dev->dev, "unable to assign resources\n");
456         return -EBUSY;
457 }
458
459 /**
460  * pnp_start_dev - low-level start of the PnP device
461  * @dev: pointer to the desired device
462  *
463  * assumes that resources have already been allocated
464  */
465 int pnp_start_dev(struct pnp_dev *dev)
466 {
467         if (!pnp_can_write(dev)) {
468                 dev_dbg(&dev->dev, "activation not supported\n");
469                 return -EINVAL;
470         }
471
472         dbg_pnp_show_resources(dev, "pnp_start_dev");
473         if (dev->protocol->set(dev) < 0) {
474                 dev_err(&dev->dev, "activation failed\n");
475                 return -EIO;
476         }
477
478         dev_info(&dev->dev, "activated\n");
479         return 0;
480 }
481
482 /**
483  * pnp_stop_dev - low-level disable of the PnP device
484  * @dev: pointer to the desired device
485  *
486  * does not free resources
487  */
488 int pnp_stop_dev(struct pnp_dev *dev)
489 {
490         if (!pnp_can_disable(dev)) {
491                 dev_dbg(&dev->dev, "disabling not supported\n");
492                 return -EINVAL;
493         }
494         if (dev->protocol->disable(dev) < 0) {
495                 dev_err(&dev->dev, "disable failed\n");
496                 return -EIO;
497         }
498
499         dev_info(&dev->dev, "disabled\n");
500         return 0;
501 }
502
503 /**
504  * pnp_activate_dev - activates a PnP device for use
505  * @dev: pointer to the desired device
506  *
507  * does not validate or set resources so be careful.
508  */
509 int pnp_activate_dev(struct pnp_dev *dev)
510 {
511         int error;
512
513         if (dev->active)
514                 return 0;
515
516         /* ensure resources are allocated */
517         if (pnp_auto_config_dev(dev))
518                 return -EBUSY;
519
520         error = pnp_start_dev(dev);
521         if (error)
522                 return error;
523
524         dev->active = 1;
525         return 0;
526 }
527
528 /**
529  * pnp_disable_dev - disables device
530  * @dev: pointer to the desired device
531  *
532  * inform the correct pnp protocol so that resources can be used by other devices
533  */
534 int pnp_disable_dev(struct pnp_dev *dev)
535 {
536         int error;
537
538         if (!dev->active)
539                 return 0;
540
541         error = pnp_stop_dev(dev);
542         if (error)
543                 return error;
544
545         dev->active = 0;
546
547         /* release the resources so that other devices can use them */
548         mutex_lock(&pnp_res_mutex);
549         pnp_clean_resource_table(dev);
550         mutex_unlock(&pnp_res_mutex);
551
552         return 0;
553 }
554
555 EXPORT_SYMBOL(pnp_start_dev);
556 EXPORT_SYMBOL(pnp_stop_dev);
557 EXPORT_SYMBOL(pnp_activate_dev);
558 EXPORT_SYMBOL(pnp_disable_dev);