]> err.no Git - linux-2.6/blob - drivers/pnp/resource.c
Merge branch 'pnp' into release
[linux-2.6] / drivers / pnp / resource.c
1 /*
2  * resource.c - Contains functions for registering and analyzing resource information
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/module.h>
9 #include <linux/errno.h>
10 #include <linux/interrupt.h>
11 #include <linux/kernel.h>
12 #include <asm/io.h>
13 #include <asm/dma.h>
14 #include <asm/irq.h>
15 #include <linux/pci.h>
16 #include <linux/ioport.h>
17 #include <linux/init.h>
18
19 #include <linux/pnp.h>
20 #include "base.h"
21
22 static int pnp_reserve_irq[16] = {[0 ... 15] = -1 };    /* reserve (don't use) some IRQ */
23 static int pnp_reserve_dma[8] = {[0 ... 7] = -1 };      /* reserve (don't use) some DMA */
24 static int pnp_reserve_io[16] = {[0 ... 15] = -1 };     /* reserve (don't use) some I/O region */
25 static int pnp_reserve_mem[16] = {[0 ... 15] = -1 };    /* reserve (don't use) some memory region */
26
27 /*
28  * option registration
29  */
30
31 static struct pnp_option *pnp_build_option(int priority)
32 {
33         struct pnp_option *option = pnp_alloc(sizeof(struct pnp_option));
34
35         if (!option)
36                 return NULL;
37
38         option->priority = priority & 0xff;
39         /* make sure the priority is valid */
40         if (option->priority > PNP_RES_PRIORITY_FUNCTIONAL)
41                 option->priority = PNP_RES_PRIORITY_INVALID;
42
43         return option;
44 }
45
46 struct pnp_option *pnp_register_independent_option(struct pnp_dev *dev)
47 {
48         struct pnp_option *option;
49
50         option = pnp_build_option(PNP_RES_PRIORITY_PREFERRED);
51
52         /* this should never happen but if it does we'll try to continue */
53         if (dev->independent)
54                 dev_err(&dev->dev, "independent resource already registered\n");
55         dev->independent = option;
56
57         dev_dbg(&dev->dev, "new independent option\n");
58         return option;
59 }
60
61 struct pnp_option *pnp_register_dependent_option(struct pnp_dev *dev,
62                                                  int priority)
63 {
64         struct pnp_option *option;
65
66         option = pnp_build_option(priority);
67
68         if (dev->dependent) {
69                 struct pnp_option *parent = dev->dependent;
70                 while (parent->next)
71                         parent = parent->next;
72                 parent->next = option;
73         } else
74                 dev->dependent = option;
75
76         dev_dbg(&dev->dev, "new dependent option (priority %#x)\n", priority);
77         return option;
78 }
79
80 int pnp_register_irq_resource(struct pnp_dev *dev, struct pnp_option *option,
81                               struct pnp_irq *data)
82 {
83         struct pnp_irq *ptr;
84 #ifdef DEBUG
85         char buf[PNP_IRQ_NR];   /* hex-encoded, so this is overkill but safe */
86 #endif
87
88         ptr = option->irq;
89         while (ptr && ptr->next)
90                 ptr = ptr->next;
91         if (ptr)
92                 ptr->next = data;
93         else
94                 option->irq = data;
95
96 #ifdef CONFIG_PCI
97         {
98                 int i;
99
100                 for (i = 0; i < 16; i++)
101                         if (test_bit(i, data->map))
102                                 pcibios_penalize_isa_irq(i, 0);
103         }
104 #endif
105
106 #ifdef DEBUG
107         bitmap_scnprintf(buf, sizeof(buf), data->map, PNP_IRQ_NR);
108         dev_dbg(&dev->dev, "  irq bitmask %s flags %#x\n", buf,
109                 data->flags);
110 #endif
111         return 0;
112 }
113
114 int pnp_register_dma_resource(struct pnp_dev *dev, struct pnp_option *option,
115                               struct pnp_dma *data)
116 {
117         struct pnp_dma *ptr;
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         dev_dbg(&dev->dev, "  dma bitmask %#x flags %#x\n", data->map,
128                 data->flags);
129         return 0;
130 }
131
132 int pnp_register_port_resource(struct pnp_dev *dev, struct pnp_option *option,
133                                struct pnp_port *data)
134 {
135         struct pnp_port *ptr;
136
137         ptr = option->port;
138         while (ptr && ptr->next)
139                 ptr = ptr->next;
140         if (ptr)
141                 ptr->next = data;
142         else
143                 option->port = data;
144
145         dev_dbg(&dev->dev, "  io  "
146                 "min %#x max %#x align %d size %d flags %#x\n",
147                 data->min, data->max, data->align, data->size, data->flags);
148         return 0;
149 }
150
151 int pnp_register_mem_resource(struct pnp_dev *dev, struct pnp_option *option,
152                               struct pnp_mem *data)
153 {
154         struct pnp_mem *ptr;
155
156         ptr = option->mem;
157         while (ptr && ptr->next)
158                 ptr = ptr->next;
159         if (ptr)
160                 ptr->next = data;
161         else
162                 option->mem = data;
163
164         dev_dbg(&dev->dev, "  mem "
165                 "min %#x max %#x align %d size %d flags %#x\n",
166                 data->min, data->max, data->align, data->size, data->flags);
167         return 0;
168 }
169
170 static void pnp_free_port(struct pnp_port *port)
171 {
172         struct pnp_port *next;
173
174         while (port) {
175                 next = port->next;
176                 kfree(port);
177                 port = next;
178         }
179 }
180
181 static void pnp_free_irq(struct pnp_irq *irq)
182 {
183         struct pnp_irq *next;
184
185         while (irq) {
186                 next = irq->next;
187                 kfree(irq);
188                 irq = next;
189         }
190 }
191
192 static void pnp_free_dma(struct pnp_dma *dma)
193 {
194         struct pnp_dma *next;
195
196         while (dma) {
197                 next = dma->next;
198                 kfree(dma);
199                 dma = next;
200         }
201 }
202
203 static void pnp_free_mem(struct pnp_mem *mem)
204 {
205         struct pnp_mem *next;
206
207         while (mem) {
208                 next = mem->next;
209                 kfree(mem);
210                 mem = next;
211         }
212 }
213
214 void pnp_free_option(struct pnp_option *option)
215 {
216         struct pnp_option *next;
217
218         while (option) {
219                 next = option->next;
220                 pnp_free_port(option->port);
221                 pnp_free_irq(option->irq);
222                 pnp_free_dma(option->dma);
223                 pnp_free_mem(option->mem);
224                 kfree(option);
225                 option = next;
226         }
227 }
228
229 /*
230  * resource validity checking
231  */
232
233 #define length(start, end) (*(end) - *(start) + 1)
234
235 /* Two ranges conflict if one doesn't end before the other starts */
236 #define ranged_conflict(starta, enda, startb, endb) \
237         !((*(enda) < *(startb)) || (*(endb) < *(starta)))
238
239 #define cannot_compare(flags) \
240 ((flags) & (IORESOURCE_UNSET | IORESOURCE_DISABLED))
241
242 int pnp_check_port(struct pnp_dev *dev, struct resource *res)
243 {
244         int i;
245         struct pnp_dev *tdev;
246         struct resource *tres;
247         resource_size_t *port, *end, *tport, *tend;
248
249         port = &res->start;
250         end = &res->end;
251
252         /* if the resource doesn't exist, don't complain about it */
253         if (cannot_compare(res->flags))
254                 return 1;
255
256         /* check if the resource is already in use, skip if the
257          * device is active because it itself may be in use */
258         if (!dev->active) {
259                 if (__check_region(&ioport_resource, *port, length(port, end)))
260                         return 0;
261         }
262
263         /* check if the resource is reserved */
264         for (i = 0; i < 8; i++) {
265                 int rport = pnp_reserve_io[i << 1];
266                 int rend = pnp_reserve_io[(i << 1) + 1] + rport - 1;
267                 if (ranged_conflict(port, end, &rport, &rend))
268                         return 0;
269         }
270
271         /* check for internal conflicts */
272         for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IO, i)); i++) {
273                 if (tres != res && tres->flags & IORESOURCE_IO) {
274                         tport = &tres->start;
275                         tend = &tres->end;
276                         if (ranged_conflict(port, end, tport, tend))
277                                 return 0;
278                 }
279         }
280
281         /* check for conflicts with other pnp devices */
282         pnp_for_each_dev(tdev) {
283                 if (tdev == dev)
284                         continue;
285                 for (i = 0;
286                      (tres = pnp_get_resource(tdev, IORESOURCE_IO, i));
287                      i++) {
288                         if (tres->flags & IORESOURCE_IO) {
289                                 if (cannot_compare(tres->flags))
290                                         continue;
291                                 tport = &tres->start;
292                                 tend = &tres->end;
293                                 if (ranged_conflict(port, end, tport, tend))
294                                         return 0;
295                         }
296                 }
297         }
298
299         return 1;
300 }
301
302 int pnp_check_mem(struct pnp_dev *dev, struct resource *res)
303 {
304         int i;
305         struct pnp_dev *tdev;
306         struct resource *tres;
307         resource_size_t *addr, *end, *taddr, *tend;
308
309         addr = &res->start;
310         end = &res->end;
311
312         /* if the resource doesn't exist, don't complain about it */
313         if (cannot_compare(res->flags))
314                 return 1;
315
316         /* check if the resource is already in use, skip if the
317          * device is active because it itself may be in use */
318         if (!dev->active) {
319                 if (check_mem_region(*addr, length(addr, end)))
320                         return 0;
321         }
322
323         /* check if the resource is reserved */
324         for (i = 0; i < 8; i++) {
325                 int raddr = pnp_reserve_mem[i << 1];
326                 int rend = pnp_reserve_mem[(i << 1) + 1] + raddr - 1;
327                 if (ranged_conflict(addr, end, &raddr, &rend))
328                         return 0;
329         }
330
331         /* check for internal conflicts */
332         for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_MEM, i)); i++) {
333                 if (tres != res && tres->flags & IORESOURCE_MEM) {
334                         taddr = &tres->start;
335                         tend = &tres->end;
336                         if (ranged_conflict(addr, end, taddr, tend))
337                                 return 0;
338                 }
339         }
340
341         /* check for conflicts with other pnp devices */
342         pnp_for_each_dev(tdev) {
343                 if (tdev == dev)
344                         continue;
345                 for (i = 0;
346                      (tres = pnp_get_resource(tdev, IORESOURCE_MEM, i));
347                      i++) {
348                         if (tres->flags & IORESOURCE_MEM) {
349                                 if (cannot_compare(tres->flags))
350                                         continue;
351                                 taddr = &tres->start;
352                                 tend = &tres->end;
353                                 if (ranged_conflict(addr, end, taddr, tend))
354                                         return 0;
355                         }
356                 }
357         }
358
359         return 1;
360 }
361
362 static irqreturn_t pnp_test_handler(int irq, void *dev_id)
363 {
364         return IRQ_HANDLED;
365 }
366
367 int pnp_check_irq(struct pnp_dev *dev, struct resource *res)
368 {
369         int i;
370         struct pnp_dev *tdev;
371         struct resource *tres;
372         resource_size_t *irq;
373
374         irq = &res->start;
375
376         /* if the resource doesn't exist, don't complain about it */
377         if (cannot_compare(res->flags))
378                 return 1;
379
380         /* check if the resource is valid */
381         if (*irq < 0 || *irq > 15)
382                 return 0;
383
384         /* check if the resource is reserved */
385         for (i = 0; i < 16; i++) {
386                 if (pnp_reserve_irq[i] == *irq)
387                         return 0;
388         }
389
390         /* check for internal conflicts */
391         for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IRQ, i)); i++) {
392                 if (tres != res && tres->flags & IORESOURCE_IRQ) {
393                         if (tres->start == *irq)
394                                 return 0;
395                 }
396         }
397
398 #ifdef CONFIG_PCI
399         /* check if the resource is being used by a pci device */
400         {
401                 struct pci_dev *pci = NULL;
402                 for_each_pci_dev(pci) {
403                         if (pci->irq == *irq) {
404                                 pci_dev_put(pci);
405                                 return 0;
406                         }
407                 }
408         }
409 #endif
410
411         /* check if the resource is already in use, skip if the
412          * device is active because it itself may be in use */
413         if (!dev->active) {
414                 if (request_irq(*irq, pnp_test_handler,
415                                 IRQF_DISABLED | IRQF_PROBE_SHARED, "pnp", NULL))
416                         return 0;
417                 free_irq(*irq, NULL);
418         }
419
420         /* check for conflicts with other pnp devices */
421         pnp_for_each_dev(tdev) {
422                 if (tdev == dev)
423                         continue;
424                 for (i = 0;
425                      (tres = pnp_get_resource(tdev, IORESOURCE_IRQ, i));
426                      i++) {
427                         if (tres->flags & IORESOURCE_IRQ) {
428                                 if (cannot_compare(tres->flags))
429                                         continue;
430                                 if (tres->start == *irq)
431                                         return 0;
432                         }
433                 }
434         }
435
436         return 1;
437 }
438
439 int pnp_check_dma(struct pnp_dev *dev, struct resource *res)
440 {
441 #ifndef CONFIG_IA64
442         int i;
443         struct pnp_dev *tdev;
444         struct resource *tres;
445         resource_size_t *dma;
446
447         dma = &res->start;
448
449         /* if the resource doesn't exist, don't complain about it */
450         if (cannot_compare(res->flags))
451                 return 1;
452
453         /* check if the resource is valid */
454         if (*dma < 0 || *dma == 4 || *dma > 7)
455                 return 0;
456
457         /* check if the resource is reserved */
458         for (i = 0; i < 8; i++) {
459                 if (pnp_reserve_dma[i] == *dma)
460                         return 0;
461         }
462
463         /* check for internal conflicts */
464         for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_DMA, i)); i++) {
465                 if (tres != res && tres->flags & IORESOURCE_DMA) {
466                         if (tres->start == *dma)
467                                 return 0;
468                 }
469         }
470
471         /* check if the resource is already in use, skip if the
472          * device is active because it itself may be in use */
473         if (!dev->active) {
474                 if (request_dma(*dma, "pnp"))
475                         return 0;
476                 free_dma(*dma);
477         }
478
479         /* check for conflicts with other pnp devices */
480         pnp_for_each_dev(tdev) {
481                 if (tdev == dev)
482                         continue;
483                 for (i = 0;
484                      (tres = pnp_get_resource(tdev, IORESOURCE_DMA, i));
485                      i++) {
486                         if (tres->flags & IORESOURCE_DMA) {
487                                 if (cannot_compare(tres->flags))
488                                         continue;
489                                 if (tres->start == *dma)
490                                         return 0;
491                         }
492                 }
493         }
494
495         return 1;
496 #else
497         /* IA64 does not have legacy DMA */
498         return 0;
499 #endif
500 }
501
502 struct pnp_resource *pnp_get_pnp_resource(struct pnp_dev *dev,
503                                           unsigned int type, unsigned int num)
504 {
505         struct pnp_resource_table *res = dev->res;
506
507         switch (type) {
508         case IORESOURCE_IO:
509                 if (num >= PNP_MAX_PORT)
510                         return NULL;
511                 return &res->port[num];
512         case IORESOURCE_MEM:
513                 if (num >= PNP_MAX_MEM)
514                         return NULL;
515                 return &res->mem[num];
516         case IORESOURCE_IRQ:
517                 if (num >= PNP_MAX_IRQ)
518                         return NULL;
519                 return &res->irq[num];
520         case IORESOURCE_DMA:
521                 if (num >= PNP_MAX_DMA)
522                         return NULL;
523                 return &res->dma[num];
524         }
525         return NULL;
526 }
527
528 struct resource *pnp_get_resource(struct pnp_dev *dev,
529                                   unsigned int type, unsigned int num)
530 {
531         struct pnp_resource *pnp_res;
532
533         pnp_res = pnp_get_pnp_resource(dev, type, num);
534         if (pnp_res)
535                 return &pnp_res->res;
536
537         return NULL;
538 }
539 EXPORT_SYMBOL(pnp_get_resource);
540
541 static struct pnp_resource *pnp_new_resource(struct pnp_dev *dev, int type)
542 {
543         struct pnp_resource *pnp_res;
544         int i;
545
546         switch (type) {
547         case IORESOURCE_IO:
548                 for (i = 0; i < PNP_MAX_PORT; i++) {
549                         pnp_res = pnp_get_pnp_resource(dev, IORESOURCE_IO, i);
550                         if (pnp_res && !pnp_resource_valid(&pnp_res->res))
551                                 return pnp_res;
552                 }
553                 break;
554         case IORESOURCE_MEM:
555                 for (i = 0; i < PNP_MAX_MEM; i++) {
556                         pnp_res = pnp_get_pnp_resource(dev, IORESOURCE_MEM, i);
557                         if (pnp_res && !pnp_resource_valid(&pnp_res->res))
558                                 return pnp_res;
559                 }
560                 break;
561         case IORESOURCE_IRQ:
562                 for (i = 0; i < PNP_MAX_IRQ; i++) {
563                         pnp_res = pnp_get_pnp_resource(dev, IORESOURCE_IRQ, i);
564                         if (pnp_res && !pnp_resource_valid(&pnp_res->res))
565                                 return pnp_res;
566                 }
567                 break;
568         case IORESOURCE_DMA:
569                 for (i = 0; i < PNP_MAX_DMA; i++) {
570                         pnp_res = pnp_get_pnp_resource(dev, IORESOURCE_DMA, i);
571                         if (pnp_res && !pnp_resource_valid(&pnp_res->res))
572                                 return pnp_res;
573                 }
574                 break;
575         }
576         return NULL;
577 }
578
579 struct pnp_resource *pnp_add_irq_resource(struct pnp_dev *dev, int irq,
580                                           int flags)
581 {
582         struct pnp_resource *pnp_res;
583         struct resource *res;
584         static unsigned char warned;
585
586         pnp_res = pnp_new_resource(dev, IORESOURCE_IRQ);
587         if (!pnp_res) {
588                 if (!warned) {
589                         dev_err(&dev->dev, "can't add resource for IRQ %d\n",
590                                 irq);
591                         warned = 1;
592                 }
593                 return NULL;
594         }
595
596         res = &pnp_res->res;
597         res->flags = IORESOURCE_IRQ | flags;
598         res->start = irq;
599         res->end = irq;
600
601         dev_dbg(&dev->dev, "  add irq %d flags %#x\n", irq, flags);
602         return pnp_res;
603 }
604
605 struct pnp_resource *pnp_add_dma_resource(struct pnp_dev *dev, int dma,
606                                           int flags)
607 {
608         struct pnp_resource *pnp_res;
609         struct resource *res;
610         static unsigned char warned;
611
612         pnp_res = pnp_new_resource(dev, IORESOURCE_DMA);
613         if (!pnp_res) {
614                 if (!warned) {
615                         dev_err(&dev->dev, "can't add resource for DMA %d\n",
616                                 dma);
617                         warned = 1;
618                 }
619                 return NULL;
620         }
621
622         res = &pnp_res->res;
623         res->flags = IORESOURCE_DMA | flags;
624         res->start = dma;
625         res->end = dma;
626
627         dev_dbg(&dev->dev, "  add dma %d flags %#x\n", dma, flags);
628         return pnp_res;
629 }
630
631 struct pnp_resource *pnp_add_io_resource(struct pnp_dev *dev,
632                                          resource_size_t start,
633                                          resource_size_t end, int flags)
634 {
635         struct pnp_resource *pnp_res;
636         struct resource *res;
637         static unsigned char warned;
638
639         pnp_res = pnp_new_resource(dev, IORESOURCE_IO);
640         if (!pnp_res) {
641                 if (!warned) {
642                         dev_err(&dev->dev, "can't add resource for IO "
643                                 "%#llx-%#llx\n",(unsigned long long) start,
644                                 (unsigned long long) end);
645                         warned = 1;
646                 }
647                 return NULL;
648         }
649
650         res = &pnp_res->res;
651         res->flags = IORESOURCE_IO | flags;
652         res->start = start;
653         res->end = end;
654
655         dev_dbg(&dev->dev, "  add io  %#llx-%#llx flags %#x\n",
656                 (unsigned long long) start, (unsigned long long) end, flags);
657         return pnp_res;
658 }
659
660 struct pnp_resource *pnp_add_mem_resource(struct pnp_dev *dev,
661                                           resource_size_t start,
662                                           resource_size_t end, int flags)
663 {
664         struct pnp_resource *pnp_res;
665         struct resource *res;
666         static unsigned char warned;
667
668         pnp_res = pnp_new_resource(dev, IORESOURCE_MEM);
669         if (!pnp_res) {
670                 if (!warned) {
671                         dev_err(&dev->dev, "can't add resource for MEM "
672                                 "%#llx-%#llx\n",(unsigned long long) start,
673                                 (unsigned long long) end);
674                         warned = 1;
675                 }
676                 return NULL;
677         }
678
679         res = &pnp_res->res;
680         res->flags = IORESOURCE_MEM | flags;
681         res->start = start;
682         res->end = end;
683
684         dev_dbg(&dev->dev, "  add mem %#llx-%#llx flags %#x\n",
685                 (unsigned long long) start, (unsigned long long) end, flags);
686         return pnp_res;
687 }
688
689 /* format is: pnp_reserve_irq=irq1[,irq2] .... */
690 static int __init pnp_setup_reserve_irq(char *str)
691 {
692         int i;
693
694         for (i = 0; i < 16; i++)
695                 if (get_option(&str, &pnp_reserve_irq[i]) != 2)
696                         break;
697         return 1;
698 }
699
700 __setup("pnp_reserve_irq=", pnp_setup_reserve_irq);
701
702 /* format is: pnp_reserve_dma=dma1[,dma2] .... */
703 static int __init pnp_setup_reserve_dma(char *str)
704 {
705         int i;
706
707         for (i = 0; i < 8; i++)
708                 if (get_option(&str, &pnp_reserve_dma[i]) != 2)
709                         break;
710         return 1;
711 }
712
713 __setup("pnp_reserve_dma=", pnp_setup_reserve_dma);
714
715 /* format is: pnp_reserve_io=io1,size1[,io2,size2] .... */
716 static int __init pnp_setup_reserve_io(char *str)
717 {
718         int i;
719
720         for (i = 0; i < 16; i++)
721                 if (get_option(&str, &pnp_reserve_io[i]) != 2)
722                         break;
723         return 1;
724 }
725
726 __setup("pnp_reserve_io=", pnp_setup_reserve_io);
727
728 /* format is: pnp_reserve_mem=mem1,size1[,mem2,size2] .... */
729 static int __init pnp_setup_reserve_mem(char *str)
730 {
731         int i;
732
733         for (i = 0; i < 16; i++)
734                 if (get_option(&str, &pnp_reserve_mem[i]) != 2)
735                         break;
736         return 1;
737 }
738
739 __setup("pnp_reserve_mem=", pnp_setup_reserve_mem);