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1da177e4 LT |
1 | /* |
2 | * resource.c - Contains functions for registering and analyzing resource information | |
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/module.h> | |
11 | #include <linux/errno.h> | |
12 | #include <linux/interrupt.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <asm/io.h> | |
15 | #include <asm/dma.h> | |
16 | #include <asm/irq.h> | |
17 | #include <linux/pci.h> | |
18 | #include <linux/ioport.h> | |
19 | #include <linux/init.h> | |
20 | ||
21 | #include <linux/pnp.h> | |
22 | #include "base.h" | |
23 | ||
24 | static int pnp_reserve_irq[16] = { [0 ... 15] = -1 }; /* reserve (don't use) some IRQ */ | |
25 | static int pnp_reserve_dma[8] = { [0 ... 7] = -1 }; /* reserve (don't use) some DMA */ | |
26 | static int pnp_reserve_io[16] = { [0 ... 15] = -1 }; /* reserve (don't use) some I/O region */ | |
27 | static int pnp_reserve_mem[16] = { [0 ... 15] = -1 }; /* reserve (don't use) some memory region */ | |
28 | ||
29 | ||
30 | /* | |
31 | * option registration | |
32 | */ | |
33 | ||
34 | static struct pnp_option * pnp_build_option(int priority) | |
35 | { | |
36 | struct pnp_option *option = pnp_alloc(sizeof(struct pnp_option)); | |
37 | ||
38 | /* check if pnp_alloc ran out of memory */ | |
39 | if (!option) | |
40 | return NULL; | |
41 | ||
42 | option->priority = priority & 0xff; | |
43 | /* make sure the priority is valid */ | |
44 | if (option->priority > PNP_RES_PRIORITY_FUNCTIONAL) | |
45 | option->priority = PNP_RES_PRIORITY_INVALID; | |
46 | ||
47 | return option; | |
48 | } | |
49 | ||
50 | struct pnp_option * pnp_register_independent_option(struct pnp_dev *dev) | |
51 | { | |
52 | struct pnp_option *option; | |
53 | if (!dev) | |
54 | return NULL; | |
55 | ||
56 | option = pnp_build_option(PNP_RES_PRIORITY_PREFERRED); | |
57 | ||
58 | /* this should never happen but if it does we'll try to continue */ | |
59 | if (dev->independent) | |
60 | pnp_err("independent resource already registered"); | |
61 | dev->independent = option; | |
62 | return option; | |
63 | } | |
64 | ||
65 | struct pnp_option * pnp_register_dependent_option(struct pnp_dev *dev, int priority) | |
66 | { | |
67 | struct pnp_option *option; | |
68 | if (!dev) | |
69 | return NULL; | |
70 | ||
71 | option = pnp_build_option(priority); | |
72 | ||
73 | if (dev->dependent) { | |
74 | struct pnp_option *parent = dev->dependent; | |
75 | while (parent->next) | |
76 | parent = parent->next; | |
77 | parent->next = option; | |
78 | } else | |
79 | dev->dependent = option; | |
80 | return option; | |
81 | } | |
82 | ||
83 | int pnp_register_irq_resource(struct pnp_option *option, struct pnp_irq *data) | |
84 | { | |
85 | struct pnp_irq *ptr; | |
86 | if (!option) | |
87 | return -EINVAL; | |
88 | if (!data) | |
89 | return -EINVAL; | |
90 | ||
91 | ptr = option->irq; | |
92 | while (ptr && ptr->next) | |
93 | ptr = ptr->next; | |
94 | if (ptr) | |
95 | ptr->next = data; | |
96 | else | |
97 | option->irq = data; | |
98 | ||
99 | #ifdef CONFIG_PCI | |
100 | { | |
101 | int i; | |
102 | ||
103 | for (i = 0; i < 16; i++) | |
104 | if (test_bit(i, data->map)) | |
c9c3e457 | 105 | pcibios_penalize_isa_irq(i, 0); |
1da177e4 LT |
106 | } |
107 | #endif | |
108 | return 0; | |
109 | } | |
110 | ||
111 | int pnp_register_dma_resource(struct pnp_option *option, struct pnp_dma *data) | |
112 | { | |
113 | struct pnp_dma *ptr; | |
114 | if (!option) | |
115 | return -EINVAL; | |
116 | if (!data) | |
117 | return -EINVAL; | |
118 | ||
119 | ptr = option->dma; | |
120 | while (ptr && ptr->next) | |
121 | ptr = ptr->next; | |
122 | if (ptr) | |
123 | ptr->next = data; | |
124 | else | |
125 | option->dma = data; | |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
130 | int pnp_register_port_resource(struct pnp_option *option, struct pnp_port *data) | |
131 | { | |
132 | struct pnp_port *ptr; | |
133 | if (!option) | |
134 | return -EINVAL; | |
135 | if (!data) | |
136 | return -EINVAL; | |
137 | ||
138 | ptr = option->port; | |
139 | while (ptr && ptr->next) | |
140 | ptr = ptr->next; | |
141 | if (ptr) | |
142 | ptr->next = data; | |
143 | else | |
144 | option->port = data; | |
145 | ||
146 | return 0; | |
147 | } | |
148 | ||
149 | int pnp_register_mem_resource(struct pnp_option *option, struct pnp_mem *data) | |
150 | { | |
151 | struct pnp_mem *ptr; | |
152 | if (!option) | |
153 | return -EINVAL; | |
154 | if (!data) | |
155 | return -EINVAL; | |
156 | ||
157 | ptr = option->mem; | |
158 | while (ptr && ptr->next) | |
159 | ptr = ptr->next; | |
160 | if (ptr) | |
161 | ptr->next = data; | |
162 | else | |
163 | option->mem = data; | |
164 | return 0; | |
165 | } | |
166 | ||
167 | static void pnp_free_port(struct pnp_port *port) | |
168 | { | |
169 | struct pnp_port *next; | |
170 | ||
171 | while (port) { | |
172 | next = port->next; | |
173 | kfree(port); | |
174 | port = next; | |
175 | } | |
176 | } | |
177 | ||
178 | static void pnp_free_irq(struct pnp_irq *irq) | |
179 | { | |
180 | struct pnp_irq *next; | |
181 | ||
182 | while (irq) { | |
183 | next = irq->next; | |
184 | kfree(irq); | |
185 | irq = next; | |
186 | } | |
187 | } | |
188 | ||
189 | static void pnp_free_dma(struct pnp_dma *dma) | |
190 | { | |
191 | struct pnp_dma *next; | |
192 | ||
193 | while (dma) { | |
194 | next = dma->next; | |
195 | kfree(dma); | |
196 | dma = next; | |
197 | } | |
198 | } | |
199 | ||
200 | static void pnp_free_mem(struct pnp_mem *mem) | |
201 | { | |
202 | struct pnp_mem *next; | |
203 | ||
204 | while (mem) { | |
205 | next = mem->next; | |
206 | kfree(mem); | |
207 | mem = next; | |
208 | } | |
209 | } | |
210 | ||
211 | void pnp_free_option(struct pnp_option *option) | |
212 | { | |
213 | struct pnp_option *next; | |
214 | ||
215 | while (option) { | |
216 | next = option->next; | |
217 | pnp_free_port(option->port); | |
218 | pnp_free_irq(option->irq); | |
219 | pnp_free_dma(option->dma); | |
220 | pnp_free_mem(option->mem); | |
221 | kfree(option); | |
222 | option = next; | |
223 | } | |
224 | } | |
225 | ||
226 | ||
227 | /* | |
228 | * resource validity checking | |
229 | */ | |
230 | ||
231 | #define length(start, end) (*(end) - *(start) + 1) | |
232 | ||
233 | /* Two ranges conflict if one doesn't end before the other starts */ | |
234 | #define ranged_conflict(starta, enda, startb, endb) \ | |
235 | !((*(enda) < *(startb)) || (*(endb) < *(starta))) | |
236 | ||
237 | #define cannot_compare(flags) \ | |
238 | ((flags) & (IORESOURCE_UNSET | IORESOURCE_DISABLED)) | |
239 | ||
240 | int pnp_check_port(struct pnp_dev * dev, int idx) | |
241 | { | |
242 | int tmp; | |
243 | struct pnp_dev *tdev; | |
244 | unsigned long *port, *end, *tport, *tend; | |
245 | port = &dev->res.port_resource[idx].start; | |
246 | end = &dev->res.port_resource[idx].end; | |
247 | ||
248 | /* if the resource doesn't exist, don't complain about it */ | |
249 | if (cannot_compare(dev->res.port_resource[idx].flags)) | |
250 | return 1; | |
251 | ||
252 | /* check if the resource is already in use, skip if the | |
253 | * device is active because it itself may be in use */ | |
254 | if(!dev->active) { | |
255 | if (__check_region(&ioport_resource, *port, length(port,end))) | |
256 | return 0; | |
257 | } | |
258 | ||
259 | /* check if the resource is reserved */ | |
260 | for (tmp = 0; tmp < 8; tmp++) { | |
261 | int rport = pnp_reserve_io[tmp << 1]; | |
262 | int rend = pnp_reserve_io[(tmp << 1) + 1] + rport - 1; | |
263 | if (ranged_conflict(port,end,&rport,&rend)) | |
264 | return 0; | |
265 | } | |
266 | ||
267 | /* check for internal conflicts */ | |
268 | for (tmp = 0; tmp < PNP_MAX_PORT && tmp != idx; tmp++) { | |
269 | if (dev->res.port_resource[tmp].flags & IORESOURCE_IO) { | |
270 | tport = &dev->res.port_resource[tmp].start; | |
271 | tend = &dev->res.port_resource[tmp].end; | |
272 | if (ranged_conflict(port,end,tport,tend)) | |
273 | return 0; | |
274 | } | |
275 | } | |
276 | ||
277 | /* check for conflicts with other pnp devices */ | |
278 | pnp_for_each_dev(tdev) { | |
279 | if (tdev == dev) | |
280 | continue; | |
281 | for (tmp = 0; tmp < PNP_MAX_PORT; tmp++) { | |
282 | if (tdev->res.port_resource[tmp].flags & IORESOURCE_IO) { | |
283 | if (cannot_compare(tdev->res.port_resource[tmp].flags)) | |
284 | continue; | |
285 | tport = &tdev->res.port_resource[tmp].start; | |
286 | tend = &tdev->res.port_resource[tmp].end; | |
287 | if (ranged_conflict(port,end,tport,tend)) | |
288 | return 0; | |
289 | } | |
290 | } | |
291 | } | |
292 | ||
293 | return 1; | |
294 | } | |
295 | ||
296 | int pnp_check_mem(struct pnp_dev * dev, int idx) | |
297 | { | |
298 | int tmp; | |
299 | struct pnp_dev *tdev; | |
300 | unsigned long *addr, *end, *taddr, *tend; | |
301 | addr = &dev->res.mem_resource[idx].start; | |
302 | end = &dev->res.mem_resource[idx].end; | |
303 | ||
304 | /* if the resource doesn't exist, don't complain about it */ | |
305 | if (cannot_compare(dev->res.mem_resource[idx].flags)) | |
306 | return 1; | |
307 | ||
308 | /* check if the resource is already in use, skip if the | |
309 | * device is active because it itself may be in use */ | |
310 | if(!dev->active) { | |
311 | if (check_mem_region(*addr, length(addr,end))) | |
312 | return 0; | |
313 | } | |
314 | ||
315 | /* check if the resource is reserved */ | |
316 | for (tmp = 0; tmp < 8; tmp++) { | |
317 | int raddr = pnp_reserve_mem[tmp << 1]; | |
318 | int rend = pnp_reserve_mem[(tmp << 1) + 1] + raddr - 1; | |
319 | if (ranged_conflict(addr,end,&raddr,&rend)) | |
320 | return 0; | |
321 | } | |
322 | ||
323 | /* check for internal conflicts */ | |
324 | for (tmp = 0; tmp < PNP_MAX_MEM && tmp != idx; tmp++) { | |
325 | if (dev->res.mem_resource[tmp].flags & IORESOURCE_MEM) { | |
326 | taddr = &dev->res.mem_resource[tmp].start; | |
327 | tend = &dev->res.mem_resource[tmp].end; | |
328 | if (ranged_conflict(addr,end,taddr,tend)) | |
329 | return 0; | |
330 | } | |
331 | } | |
332 | ||
333 | /* check for conflicts with other pnp devices */ | |
334 | pnp_for_each_dev(tdev) { | |
335 | if (tdev == dev) | |
336 | continue; | |
337 | for (tmp = 0; tmp < PNP_MAX_MEM; tmp++) { | |
338 | if (tdev->res.mem_resource[tmp].flags & IORESOURCE_MEM) { | |
339 | if (cannot_compare(tdev->res.mem_resource[tmp].flags)) | |
340 | continue; | |
341 | taddr = &tdev->res.mem_resource[tmp].start; | |
342 | tend = &tdev->res.mem_resource[tmp].end; | |
343 | if (ranged_conflict(addr,end,taddr,tend)) | |
344 | return 0; | |
345 | } | |
346 | } | |
347 | } | |
348 | ||
349 | return 1; | |
350 | } | |
351 | ||
352 | static irqreturn_t pnp_test_handler(int irq, void *dev_id, struct pt_regs *regs) | |
353 | { | |
354 | return IRQ_HANDLED; | |
355 | } | |
356 | ||
357 | int pnp_check_irq(struct pnp_dev * dev, int idx) | |
358 | { | |
359 | int tmp; | |
360 | struct pnp_dev *tdev; | |
361 | unsigned long * irq = &dev->res.irq_resource[idx].start; | |
362 | ||
363 | /* if the resource doesn't exist, don't complain about it */ | |
364 | if (cannot_compare(dev->res.irq_resource[idx].flags)) | |
365 | return 1; | |
366 | ||
367 | /* check if the resource is valid */ | |
368 | if (*irq < 0 || *irq > 15) | |
369 | return 0; | |
370 | ||
371 | /* check if the resource is reserved */ | |
372 | for (tmp = 0; tmp < 16; tmp++) { | |
373 | if (pnp_reserve_irq[tmp] == *irq) | |
374 | return 0; | |
375 | } | |
376 | ||
377 | /* check for internal conflicts */ | |
378 | for (tmp = 0; tmp < PNP_MAX_IRQ && tmp != idx; tmp++) { | |
379 | if (dev->res.irq_resource[tmp].flags & IORESOURCE_IRQ) { | |
380 | if (dev->res.irq_resource[tmp].start == *irq) | |
381 | return 0; | |
382 | } | |
383 | } | |
384 | ||
385 | #ifdef CONFIG_PCI | |
386 | /* check if the resource is being used by a pci device */ | |
387 | { | |
388 | struct pci_dev *pci = NULL; | |
389 | for_each_pci_dev(pci) { | |
390 | if (pci->irq == *irq) | |
391 | return 0; | |
392 | } | |
393 | } | |
394 | #endif | |
395 | ||
396 | /* check if the resource is already in use, skip if the | |
397 | * device is active because it itself may be in use */ | |
398 | if(!dev->active) { | |
399 | if (request_irq(*irq, pnp_test_handler, SA_INTERRUPT, "pnp", NULL)) | |
400 | return 0; | |
401 | free_irq(*irq, NULL); | |
402 | } | |
403 | ||
404 | /* check for conflicts with other pnp devices */ | |
405 | pnp_for_each_dev(tdev) { | |
406 | if (tdev == dev) | |
407 | continue; | |
408 | for (tmp = 0; tmp < PNP_MAX_IRQ; tmp++) { | |
409 | if (tdev->res.irq_resource[tmp].flags & IORESOURCE_IRQ) { | |
410 | if (cannot_compare(tdev->res.irq_resource[tmp].flags)) | |
411 | continue; | |
412 | if ((tdev->res.irq_resource[tmp].start == *irq)) | |
413 | return 0; | |
414 | } | |
415 | } | |
416 | } | |
417 | ||
418 | return 1; | |
419 | } | |
420 | ||
421 | int pnp_check_dma(struct pnp_dev * dev, int idx) | |
422 | { | |
423 | #ifndef CONFIG_IA64 | |
424 | int tmp; | |
425 | struct pnp_dev *tdev; | |
426 | unsigned long * dma = &dev->res.dma_resource[idx].start; | |
427 | ||
428 | /* if the resource doesn't exist, don't complain about it */ | |
429 | if (cannot_compare(dev->res.dma_resource[idx].flags)) | |
430 | return 1; | |
431 | ||
432 | /* check if the resource is valid */ | |
433 | if (*dma < 0 || *dma == 4 || *dma > 7) | |
434 | return 0; | |
435 | ||
436 | /* check if the resource is reserved */ | |
437 | for (tmp = 0; tmp < 8; tmp++) { | |
438 | if (pnp_reserve_dma[tmp] == *dma) | |
439 | return 0; | |
440 | } | |
441 | ||
442 | /* check for internal conflicts */ | |
443 | for (tmp = 0; tmp < PNP_MAX_DMA && tmp != idx; tmp++) { | |
444 | if (dev->res.dma_resource[tmp].flags & IORESOURCE_DMA) { | |
445 | if (dev->res.dma_resource[tmp].start == *dma) | |
446 | return 0; | |
447 | } | |
448 | } | |
449 | ||
450 | /* check if the resource is already in use, skip if the | |
451 | * device is active because it itself may be in use */ | |
452 | if(!dev->active) { | |
453 | if (request_dma(*dma, "pnp")) | |
454 | return 0; | |
455 | free_dma(*dma); | |
456 | } | |
457 | ||
458 | /* check for conflicts with other pnp devices */ | |
459 | pnp_for_each_dev(tdev) { | |
460 | if (tdev == dev) | |
461 | continue; | |
462 | for (tmp = 0; tmp < PNP_MAX_DMA; tmp++) { | |
463 | if (tdev->res.dma_resource[tmp].flags & IORESOURCE_DMA) { | |
464 | if (cannot_compare(tdev->res.dma_resource[tmp].flags)) | |
465 | continue; | |
466 | if ((tdev->res.dma_resource[tmp].start == *dma)) | |
467 | return 0; | |
468 | } | |
469 | } | |
470 | } | |
471 | ||
472 | return 1; | |
473 | #else | |
474 | /* IA64 hasn't legacy DMA */ | |
475 | return 0; | |
476 | #endif | |
477 | } | |
478 | ||
479 | ||
b449f63c | 480 | #if 0 |
1da177e4 LT |
481 | EXPORT_SYMBOL(pnp_register_dependent_option); |
482 | EXPORT_SYMBOL(pnp_register_independent_option); | |
483 | EXPORT_SYMBOL(pnp_register_irq_resource); | |
484 | EXPORT_SYMBOL(pnp_register_dma_resource); | |
485 | EXPORT_SYMBOL(pnp_register_port_resource); | |
486 | EXPORT_SYMBOL(pnp_register_mem_resource); | |
b449f63c | 487 | #endif /* 0 */ |
1da177e4 LT |
488 | |
489 | ||
490 | /* format is: pnp_reserve_irq=irq1[,irq2] .... */ | |
491 | ||
492 | static int __init pnp_setup_reserve_irq(char *str) | |
493 | { | |
494 | int i; | |
495 | ||
496 | for (i = 0; i < 16; i++) | |
497 | if (get_option(&str,&pnp_reserve_irq[i]) != 2) | |
498 | break; | |
499 | return 1; | |
500 | } | |
501 | ||
502 | __setup("pnp_reserve_irq=", pnp_setup_reserve_irq); | |
503 | ||
504 | /* format is: pnp_reserve_dma=dma1[,dma2] .... */ | |
505 | ||
506 | static int __init pnp_setup_reserve_dma(char *str) | |
507 | { | |
508 | int i; | |
509 | ||
510 | for (i = 0; i < 8; i++) | |
511 | if (get_option(&str,&pnp_reserve_dma[i]) != 2) | |
512 | break; | |
513 | return 1; | |
514 | } | |
515 | ||
516 | __setup("pnp_reserve_dma=", pnp_setup_reserve_dma); | |
517 | ||
518 | /* format is: pnp_reserve_io=io1,size1[,io2,size2] .... */ | |
519 | ||
520 | static int __init pnp_setup_reserve_io(char *str) | |
521 | { | |
522 | int i; | |
523 | ||
524 | for (i = 0; i < 16; i++) | |
525 | if (get_option(&str,&pnp_reserve_io[i]) != 2) | |
526 | break; | |
527 | return 1; | |
528 | } | |
529 | ||
530 | __setup("pnp_reserve_io=", pnp_setup_reserve_io); | |
531 | ||
532 | /* format is: pnp_reserve_mem=mem1,size1[,mem2,size2] .... */ | |
533 | ||
534 | static int __init pnp_setup_reserve_mem(char *str) | |
535 | { | |
536 | int i; | |
537 | ||
538 | for (i = 0; i < 16; i++) | |
539 | if (get_option(&str,&pnp_reserve_mem[i]) != 2) | |
540 | break; | |
541 | return 1; | |
542 | } | |
543 | ||
544 | __setup("pnp_reserve_mem=", pnp_setup_reserve_mem); |