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 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_assign_resources);
562 EXPORT_SYMBOL(pnp_manual_config_dev);
563 EXPORT_SYMBOL(pnp_auto_config_dev);
564 EXPORT_SYMBOL(pnp_activate_dev);
565 EXPORT_SYMBOL(pnp_disable_dev);
566 EXPORT_SYMBOL(pnp_resource_change);
567 EXPORT_SYMBOL(pnp_init_resource_table);
568
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