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1da177e4 LT |
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@suse.cz> | |
5 | * Copyright 2003 Adam Belay <ambx1@neo.rr.com> | |
6 | * | |
7 | */ | |
8 | ||
9 | #include <linux/config.h> | |
10 | #include <linux/errno.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/kernel.h> | |
14 | ||
15 | #ifdef CONFIG_PNP_DEBUG | |
16 | #define DEBUG | |
17 | #else | |
18 | #undef DEBUG | |
19 | #endif | |
20 | ||
21 | #include <linux/pnp.h> | |
22 | #include "base.h" | |
23 | ||
24 | DECLARE_MUTEX(pnp_res_mutex); | |
25 | ||
26 | static int pnp_assign_port(struct pnp_dev *dev, struct pnp_port *rule, int idx) | |
27 | { | |
28 | unsigned long *start, *end, *flags; | |
29 | ||
30 | if (!dev || !rule) | |
31 | return -EINVAL; | |
32 | ||
33 | if (idx >= PNP_MAX_PORT) { | |
34 | pnp_err("More than 4 ports is incompatible with pnp specifications."); | |
35 | /* pretend we were successful so at least the manager won't try again */ | |
36 | return 1; | |
37 | } | |
38 | ||
39 | /* check if this resource has been manually set, if so skip */ | |
40 | if (!(dev->res.port_resource[idx].flags & IORESOURCE_AUTO)) | |
41 | return 1; | |
42 | ||
43 | start = &dev->res.port_resource[idx].start; | |
44 | end = &dev->res.port_resource[idx].end; | |
45 | flags = &dev->res.port_resource[idx].flags; | |
46 | ||
47 | /* set the initial values */ | |
48 | *flags |= rule->flags | IORESOURCE_IO; | |
49 | *flags &= ~IORESOURCE_UNSET; | |
50 | ||
51 | if (!rule->size) { | |
52 | *flags |= IORESOURCE_DISABLED; | |
53 | return 1; /* skip disabled resource requests */ | |
54 | } | |
55 | ||
56 | *start = rule->min; | |
57 | *end = *start + rule->size - 1; | |
58 | ||
59 | /* run through until pnp_check_port is happy */ | |
60 | while (!pnp_check_port(dev, idx)) { | |
61 | *start += rule->align; | |
62 | *end = *start + rule->size - 1; | |
63 | if (*start > rule->max || !rule->align) | |
64 | return 0; | |
65 | } | |
66 | return 1; | |
67 | } | |
68 | ||
69 | static int pnp_assign_mem(struct pnp_dev *dev, struct pnp_mem *rule, int idx) | |
70 | { | |
71 | unsigned long *start, *end, *flags; | |
72 | ||
73 | if (!dev || !rule) | |
74 | return -EINVAL; | |
75 | ||
76 | if (idx >= PNP_MAX_MEM) { | |
77 | pnp_err("More than 8 mems is incompatible with pnp specifications."); | |
78 | /* pretend we were successful so at least the manager won't try again */ | |
79 | return 1; | |
80 | } | |
81 | ||
82 | /* check if this resource has been manually set, if so skip */ | |
83 | if (!(dev->res.mem_resource[idx].flags & IORESOURCE_AUTO)) | |
84 | return 1; | |
85 | ||
86 | start = &dev->res.mem_resource[idx].start; | |
87 | end = &dev->res.mem_resource[idx].end; | |
88 | flags = &dev->res.mem_resource[idx].flags; | |
89 | ||
90 | /* set the initial values */ | |
91 | *flags |= rule->flags | IORESOURCE_MEM; | |
92 | *flags &= ~IORESOURCE_UNSET; | |
93 | ||
94 | /* convert pnp flags to standard Linux flags */ | |
95 | if (!(rule->flags & IORESOURCE_MEM_WRITEABLE)) | |
96 | *flags |= IORESOURCE_READONLY; | |
97 | if (rule->flags & IORESOURCE_MEM_CACHEABLE) | |
98 | *flags |= IORESOURCE_CACHEABLE; | |
99 | if (rule->flags & IORESOURCE_MEM_RANGELENGTH) | |
100 | *flags |= IORESOURCE_RANGELENGTH; | |
101 | if (rule->flags & IORESOURCE_MEM_SHADOWABLE) | |
102 | *flags |= IORESOURCE_SHADOWABLE; | |
103 | ||
104 | if (!rule->size) { | |
105 | *flags |= IORESOURCE_DISABLED; | |
106 | return 1; /* skip disabled resource requests */ | |
107 | } | |
108 | ||
109 | *start = rule->min; | |
110 | *end = *start + rule->size -1; | |
111 | ||
112 | /* run through until pnp_check_mem is happy */ | |
113 | while (!pnp_check_mem(dev, idx)) { | |
114 | *start += rule->align; | |
115 | *end = *start + rule->size - 1; | |
116 | if (*start > rule->max || !rule->align) | |
117 | return 0; | |
118 | } | |
119 | return 1; | |
120 | } | |
121 | ||
122 | static int pnp_assign_irq(struct pnp_dev * dev, struct pnp_irq *rule, int idx) | |
123 | { | |
124 | unsigned long *start, *end, *flags; | |
125 | int i; | |
126 | ||
127 | /* IRQ priority: this table is good for i386 */ | |
128 | static unsigned short xtab[16] = { | |
129 | 5, 10, 11, 12, 9, 14, 15, 7, 3, 4, 13, 0, 1, 6, 8, 2 | |
130 | }; | |
131 | ||
132 | if (!dev || !rule) | |
133 | return -EINVAL; | |
134 | ||
135 | if (idx >= PNP_MAX_IRQ) { | |
136 | pnp_err("More than 2 irqs is incompatible with pnp specifications."); | |
137 | /* pretend we were successful so at least the manager won't try again */ | |
138 | return 1; | |
139 | } | |
140 | ||
141 | /* check if this resource has been manually set, if so skip */ | |
142 | if (!(dev->res.irq_resource[idx].flags & IORESOURCE_AUTO)) | |
143 | return 1; | |
144 | ||
145 | start = &dev->res.irq_resource[idx].start; | |
146 | end = &dev->res.irq_resource[idx].end; | |
147 | flags = &dev->res.irq_resource[idx].flags; | |
148 | ||
149 | /* set the initial values */ | |
150 | *flags |= rule->flags | IORESOURCE_IRQ; | |
151 | *flags &= ~IORESOURCE_UNSET; | |
152 | ||
153 | if (bitmap_empty(rule->map, PNP_IRQ_NR)) { | |
154 | *flags |= IORESOURCE_DISABLED; | |
155 | return 1; /* skip disabled resource requests */ | |
156 | } | |
157 | ||
158 | /* TBD: need check for >16 IRQ */ | |
159 | *start = find_next_bit(rule->map, PNP_IRQ_NR, 16); | |
160 | if (*start < PNP_IRQ_NR) { | |
161 | *end = *start; | |
162 | return 1; | |
163 | } | |
164 | for (i = 0; i < 16; i++) { | |
165 | if(test_bit(xtab[i], rule->map)) { | |
166 | *start = *end = xtab[i]; | |
167 | if(pnp_check_irq(dev, idx)) | |
168 | return 1; | |
169 | } | |
170 | } | |
171 | return 0; | |
172 | } | |
173 | ||
174 | static int pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx) | |
175 | { | |
176 | unsigned long *start, *end, *flags; | |
177 | int i; | |
178 | ||
179 | /* DMA priority: this table is good for i386 */ | |
180 | static unsigned short xtab[8] = { | |
181 | 1, 3, 5, 6, 7, 0, 2, 4 | |
182 | }; | |
183 | ||
184 | if (!dev || !rule) | |
185 | return -EINVAL; | |
186 | ||
187 | if (idx >= PNP_MAX_DMA) { | |
188 | pnp_err("More than 2 dmas is incompatible with pnp specifications."); | |
189 | /* pretend we were successful so at least the manager won't try again */ | |
190 | return 1; | |
191 | } | |
192 | ||
193 | /* check if this resource has been manually set, if so skip */ | |
194 | if (!(dev->res.dma_resource[idx].flags & IORESOURCE_AUTO)) | |
195 | return 1; | |
196 | ||
197 | start = &dev->res.dma_resource[idx].start; | |
198 | end = &dev->res.dma_resource[idx].end; | |
199 | flags = &dev->res.dma_resource[idx].flags; | |
200 | ||
201 | /* set the initial values */ | |
202 | *flags |= rule->flags | IORESOURCE_DMA; | |
203 | *flags &= ~IORESOURCE_UNSET; | |
204 | ||
205 | if (!rule->map) { | |
206 | *flags |= IORESOURCE_DISABLED; | |
207 | return 1; /* skip disabled resource requests */ | |
208 | } | |
209 | ||
210 | for (i = 0; i < 8; i++) { | |
211 | if(rule->map & (1<<xtab[i])) { | |
212 | *start = *end = xtab[i]; | |
213 | if(pnp_check_dma(dev, idx)) | |
214 | return 1; | |
215 | } | |
216 | } | |
217 | return 0; | |
218 | } | |
219 | ||
220 | /** | |
221 | * pnp_init_resources - Resets a resource table to default values. | |
222 | * @table: pointer to the desired resource table | |
223 | * | |
224 | */ | |
225 | void pnp_init_resource_table(struct pnp_resource_table *table) | |
226 | { | |
227 | int idx; | |
228 | for (idx = 0; idx < PNP_MAX_IRQ; idx++) { | |
229 | table->irq_resource[idx].name = NULL; | |
230 | table->irq_resource[idx].start = -1; | |
231 | table->irq_resource[idx].end = -1; | |
232 | table->irq_resource[idx].flags = IORESOURCE_IRQ | IORESOURCE_AUTO | IORESOURCE_UNSET; | |
233 | } | |
234 | for (idx = 0; idx < PNP_MAX_DMA; idx++) { | |
235 | table->dma_resource[idx].name = NULL; | |
236 | table->dma_resource[idx].start = -1; | |
237 | table->dma_resource[idx].end = -1; | |
238 | table->dma_resource[idx].flags = IORESOURCE_DMA | IORESOURCE_AUTO | IORESOURCE_UNSET; | |
239 | } | |
240 | for (idx = 0; idx < PNP_MAX_PORT; idx++) { | |
241 | table->port_resource[idx].name = NULL; | |
242 | table->port_resource[idx].start = 0; | |
243 | table->port_resource[idx].end = 0; | |
244 | table->port_resource[idx].flags = IORESOURCE_IO | IORESOURCE_AUTO | IORESOURCE_UNSET; | |
245 | } | |
246 | for (idx = 0; idx < PNP_MAX_MEM; idx++) { | |
247 | table->mem_resource[idx].name = NULL; | |
248 | table->mem_resource[idx].start = 0; | |
249 | table->mem_resource[idx].end = 0; | |
250 | table->mem_resource[idx].flags = IORESOURCE_MEM | IORESOURCE_AUTO | IORESOURCE_UNSET; | |
251 | } | |
252 | } | |
253 | ||
254 | /** | |
255 | * pnp_clean_resources - clears resources that were not manually set | |
256 | * @res - the resources to clean | |
257 | * | |
258 | */ | |
259 | static void pnp_clean_resource_table(struct pnp_resource_table * res) | |
260 | { | |
261 | int idx; | |
262 | for (idx = 0; idx < PNP_MAX_IRQ; idx++) { | |
263 | if (!(res->irq_resource[idx].flags & IORESOURCE_AUTO)) | |
264 | continue; | |
265 | res->irq_resource[idx].start = -1; | |
266 | res->irq_resource[idx].end = -1; | |
267 | res->irq_resource[idx].flags = IORESOURCE_IRQ | IORESOURCE_AUTO | IORESOURCE_UNSET; | |
268 | } | |
269 | for (idx = 0; idx < PNP_MAX_DMA; idx++) { | |
270 | if (!(res->dma_resource[idx].flags & IORESOURCE_AUTO)) | |
271 | continue; | |
272 | res->dma_resource[idx].start = -1; | |
273 | res->dma_resource[idx].end = -1; | |
274 | res->dma_resource[idx].flags = IORESOURCE_DMA | IORESOURCE_AUTO | IORESOURCE_UNSET; | |
275 | } | |
276 | for (idx = 0; idx < PNP_MAX_PORT; idx++) { | |
277 | if (!(res->port_resource[idx].flags & IORESOURCE_AUTO)) | |
278 | continue; | |
279 | res->port_resource[idx].start = 0; | |
280 | res->port_resource[idx].end = 0; | |
281 | res->port_resource[idx].flags = IORESOURCE_IO | IORESOURCE_AUTO | IORESOURCE_UNSET; | |
282 | } | |
283 | for (idx = 0; idx < PNP_MAX_MEM; idx++) { | |
284 | if (!(res->mem_resource[idx].flags & IORESOURCE_AUTO)) | |
285 | continue; | |
286 | res->mem_resource[idx].start = 0; | |
287 | res->mem_resource[idx].end = 0; | |
288 | res->mem_resource[idx].flags = IORESOURCE_MEM | IORESOURCE_AUTO | IORESOURCE_UNSET; | |
289 | } | |
290 | } | |
291 | ||
292 | /** | |
293 | * pnp_assign_resources - assigns resources to the device based on the specified dependent number | |
294 | * @dev: pointer to the desired device | |
295 | * @depnum: the dependent function number | |
296 | * | |
297 | * Only set depnum to 0 if the device does not have dependent options. | |
298 | */ | |
299 | static int pnp_assign_resources(struct pnp_dev *dev, int depnum) | |
300 | { | |
301 | struct pnp_port *port; | |
302 | struct pnp_mem *mem; | |
303 | struct pnp_irq *irq; | |
304 | struct pnp_dma *dma; | |
305 | int nport = 0, nmem = 0, nirq = 0, ndma = 0; | |
306 | ||
307 | if (!pnp_can_configure(dev)) | |
308 | return -ENODEV; | |
309 | ||
310 | down(&pnp_res_mutex); | |
311 | pnp_clean_resource_table(&dev->res); /* start with a fresh slate */ | |
312 | if (dev->independent) { | |
313 | port = dev->independent->port; | |
314 | mem = dev->independent->mem; | |
315 | irq = dev->independent->irq; | |
316 | dma = dev->independent->dma; | |
317 | while (port) { | |
318 | if (!pnp_assign_port(dev, port, nport)) | |
319 | goto fail; | |
320 | nport++; | |
321 | port = port->next; | |
322 | } | |
323 | while (mem) { | |
324 | if (!pnp_assign_mem(dev, mem, nmem)) | |
325 | goto fail; | |
326 | nmem++; | |
327 | mem = mem->next; | |
328 | } | |
329 | while (irq) { | |
330 | if (!pnp_assign_irq(dev, irq, nirq)) | |
331 | goto fail; | |
332 | nirq++; | |
333 | irq = irq->next; | |
334 | } | |
335 | while (dma) { | |
336 | if (!pnp_assign_dma(dev, dma, ndma)) | |
337 | goto fail; | |
338 | ndma++; | |
339 | dma = dma->next; | |
340 | } | |
341 | } | |
342 | ||
343 | if (depnum) { | |
344 | struct pnp_option *dep; | |
345 | int i; | |
346 | for (i=1,dep=dev->dependent; i<depnum; i++, dep=dep->next) | |
347 | if(!dep) | |
348 | goto fail; | |
349 | port =dep->port; | |
350 | mem = dep->mem; | |
351 | irq = dep->irq; | |
352 | dma = dep->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 | if (!pnp_assign_dma(dev, dma, ndma)) | |
373 | goto fail; | |
374 | ndma++; | |
375 | dma = dma->next; | |
376 | } | |
377 | } else if (dev->dependent) | |
378 | goto fail; | |
379 | ||
380 | up(&pnp_res_mutex); | |
381 | return 1; | |
382 | ||
383 | fail: | |
384 | pnp_clean_resource_table(&dev->res); | |
385 | up(&pnp_res_mutex); | |
386 | return 0; | |
387 | } | |
388 | ||
389 | /** | |
390 | * pnp_manual_config_dev - Disables Auto Config and Manually sets the resource table | |
391 | * @dev: pointer to the desired device | |
392 | * @res: pointer to the new resource config | |
393 | * | |
394 | * This function can be used by drivers that want to manually set thier resources. | |
395 | */ | |
396 | int pnp_manual_config_dev(struct pnp_dev *dev, struct pnp_resource_table * res, int mode) | |
397 | { | |
398 | int i; | |
399 | struct pnp_resource_table * bak; | |
400 | if (!dev || !res) | |
401 | return -EINVAL; | |
402 | if (!pnp_can_configure(dev)) | |
403 | return -ENODEV; | |
404 | bak = pnp_alloc(sizeof(struct pnp_resource_table)); | |
405 | if (!bak) | |
406 | return -ENOMEM; | |
407 | *bak = dev->res; | |
408 | ||
409 | down(&pnp_res_mutex); | |
410 | dev->res = *res; | |
411 | if (!(mode & PNP_CONFIG_FORCE)) { | |
412 | for (i = 0; i < PNP_MAX_PORT; i++) { | |
413 | if(!pnp_check_port(dev,i)) | |
414 | goto fail; | |
415 | } | |
416 | for (i = 0; i < PNP_MAX_MEM; i++) { | |
417 | if(!pnp_check_mem(dev,i)) | |
418 | goto fail; | |
419 | } | |
420 | for (i = 0; i < PNP_MAX_IRQ; i++) { | |
421 | if(!pnp_check_irq(dev,i)) | |
422 | goto fail; | |
423 | } | |
424 | for (i = 0; i < PNP_MAX_DMA; i++) { | |
425 | if(!pnp_check_dma(dev,i)) | |
426 | goto fail; | |
427 | } | |
428 | } | |
429 | up(&pnp_res_mutex); | |
430 | ||
431 | kfree(bak); | |
432 | return 0; | |
433 | ||
434 | fail: | |
435 | dev->res = *bak; | |
436 | up(&pnp_res_mutex); | |
437 | kfree(bak); | |
438 | return -EINVAL; | |
439 | } | |
440 | ||
441 | /** | |
442 | * pnp_auto_config_dev - automatically assigns resources to a device | |
443 | * @dev: pointer to the desired device | |
444 | * | |
445 | */ | |
446 | int pnp_auto_config_dev(struct pnp_dev *dev) | |
447 | { | |
448 | struct pnp_option *dep; | |
449 | int i = 1; | |
450 | ||
451 | if(!dev) | |
452 | return -EINVAL; | |
453 | ||
454 | if(!pnp_can_configure(dev)) { | |
455 | pnp_info("Device %s does not support resource configuration.", dev->dev.bus_id); | |
456 | return -ENODEV; | |
457 | } | |
458 | ||
459 | if (!dev->dependent) { | |
460 | if (pnp_assign_resources(dev, 0)) | |
461 | return 0; | |
462 | } else { | |
463 | dep = dev->dependent; | |
464 | do { | |
465 | if (pnp_assign_resources(dev, i)) | |
466 | return 0; | |
467 | dep = dep->next; | |
468 | i++; | |
469 | } while (dep); | |
470 | } | |
471 | ||
472 | pnp_err("Unable to assign resources to device %s.", dev->dev.bus_id); | |
473 | return -EBUSY; | |
474 | } | |
475 | ||
476 | /** | |
477 | * pnp_activate_dev - activates a PnP device for use | |
478 | * @dev: pointer to the desired device | |
479 | * | |
480 | * does not validate or set resources so be careful. | |
481 | */ | |
482 | int pnp_activate_dev(struct pnp_dev *dev) | |
483 | { | |
484 | if (!dev) | |
485 | return -EINVAL; | |
486 | if (dev->active) { | |
487 | return 0; /* the device is already active */ | |
488 | } | |
489 | ||
490 | /* ensure resources are allocated */ | |
491 | if (pnp_auto_config_dev(dev)) | |
492 | return -EBUSY; | |
493 | ||
494 | if (!pnp_can_write(dev)) { | |
495 | pnp_info("Device %s does not supported activation.", dev->dev.bus_id); | |
496 | return -EINVAL; | |
497 | } | |
498 | ||
499 | if (dev->protocol->set(dev, &dev->res)<0) { | |
500 | pnp_err("Failed to activate device %s.", dev->dev.bus_id); | |
501 | return -EIO; | |
502 | } | |
503 | ||
504 | dev->active = 1; | |
505 | pnp_info("Device %s activated.", dev->dev.bus_id); | |
506 | ||
507 | return 1; | |
508 | } | |
509 | ||
510 | /** | |
511 | * pnp_disable_dev - disables device | |
512 | * @dev: pointer to the desired device | |
513 | * | |
514 | * inform the correct pnp protocol so that resources can be used by other devices | |
515 | */ | |
516 | int pnp_disable_dev(struct pnp_dev *dev) | |
517 | { | |
518 | if (!dev) | |
519 | return -EINVAL; | |
520 | if (!dev->active) { | |
521 | return 0; /* the device is already disabled */ | |
522 | } | |
523 | ||
524 | if (!pnp_can_disable(dev)) { | |
525 | pnp_info("Device %s does not supported disabling.", dev->dev.bus_id); | |
526 | return -EINVAL; | |
527 | } | |
528 | if (dev->protocol->disable(dev)<0) { | |
529 | pnp_err("Failed to disable device %s.", dev->dev.bus_id); | |
530 | return -EIO; | |
531 | } | |
532 | ||
533 | dev->active = 0; | |
534 | pnp_info("Device %s disabled.", dev->dev.bus_id); | |
535 | ||
536 | /* release the resources so that other devices can use them */ | |
537 | down(&pnp_res_mutex); | |
538 | pnp_clean_resource_table(&dev->res); | |
539 | up(&pnp_res_mutex); | |
540 | ||
541 | return 1; | |
542 | } | |
543 | ||
544 | /** | |
545 | * pnp_resource_change - change one resource | |
546 | * @resource: pointer to resource to be changed | |
547 | * @start: start of region | |
548 | * @size: size of region | |
549 | * | |
550 | */ | |
551 | void pnp_resource_change(struct resource *resource, unsigned long start, unsigned long size) | |
552 | { | |
553 | if (resource == NULL) | |
554 | return; | |
555 | resource->flags &= ~(IORESOURCE_AUTO | IORESOURCE_UNSET); | |
556 | resource->start = start; | |
557 | resource->end = start + size - 1; | |
558 | } | |
559 | ||
560 | ||
561 | EXPORT_SYMBOL(pnp_manual_config_dev); | |
562 | EXPORT_SYMBOL(pnp_auto_config_dev); | |
563 | EXPORT_SYMBOL(pnp_activate_dev); | |
564 | EXPORT_SYMBOL(pnp_disable_dev); | |
565 | EXPORT_SYMBOL(pnp_resource_change); | |
566 | EXPORT_SYMBOL(pnp_init_resource_table); |