[SCSI] zfcp: Cleanup function parameters for sbal value.
[linux-2.6.git] / 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  * Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
7  *      Bjorn Helgaas <bjorn.helgaas@hp.com>
8  */
9
10 #include <linux/module.h>
11 #include <linux/slab.h>
12 #include <linux/errno.h>
13 #include <linux/interrupt.h>
14 #include <linux/kernel.h>
15 #include <asm/io.h>
16 #include <asm/dma.h>
17 #include <asm/irq.h>
18 #include <linux/pci.h>
19 #include <linux/ioport.h>
20 #include <linux/init.h>
21
22 #include <linux/pnp.h>
23 #include "base.h"
24
25 static int pnp_reserve_irq[16] = {[0 ... 15] = -1 };    /* reserve (don't use) some IRQ */
26 static int pnp_reserve_dma[8] = {[0 ... 7] = -1 };      /* reserve (don't use) some DMA */
27 static int pnp_reserve_io[16] = {[0 ... 15] = -1 };     /* reserve (don't use) some I/O region */
28 static int pnp_reserve_mem[16] = {[0 ... 15] = -1 };    /* reserve (don't use) some memory region */
29
30 /*
31  * option registration
32  */
33
34 struct pnp_option *pnp_build_option(struct pnp_dev *dev, unsigned long type,
35                                     unsigned int option_flags)
36 {
37         struct pnp_option *option;
38
39         option = kzalloc(sizeof(struct pnp_option), GFP_KERNEL);
40         if (!option)
41                 return NULL;
42
43         option->flags = option_flags;
44         option->type = type;
45
46         list_add_tail(&option->list, &dev->options);
47         return option;
48 }
49
50 int pnp_register_irq_resource(struct pnp_dev *dev, unsigned int option_flags,
51                               pnp_irq_mask_t *map, unsigned char flags)
52 {
53         struct pnp_option *option;
54         struct pnp_irq *irq;
55
56         option = pnp_build_option(dev, IORESOURCE_IRQ, option_flags);
57         if (!option)
58                 return -ENOMEM;
59
60         irq = &option->u.irq;
61         irq->map = *map;
62         irq->flags = flags;
63
64 #ifdef CONFIG_PCI
65         {
66                 int i;
67
68                 for (i = 0; i < 16; i++)
69                         if (test_bit(i, irq->map.bits))
70                                 pcibios_penalize_isa_irq(i, 0);
71         }
72 #endif
73
74         dbg_pnp_show_option(dev, option);
75         return 0;
76 }
77
78 int pnp_register_dma_resource(struct pnp_dev *dev, unsigned int option_flags,
79                               unsigned char map, unsigned char flags)
80 {
81         struct pnp_option *option;
82         struct pnp_dma *dma;
83
84         option = pnp_build_option(dev, IORESOURCE_DMA, option_flags);
85         if (!option)
86                 return -ENOMEM;
87
88         dma = &option->u.dma;
89         dma->map = map;
90         dma->flags = flags;
91
92         dbg_pnp_show_option(dev, option);
93         return 0;
94 }
95
96 int pnp_register_port_resource(struct pnp_dev *dev, unsigned int option_flags,
97                                resource_size_t min, resource_size_t max,
98                                resource_size_t align, resource_size_t size,
99                                unsigned char flags)
100 {
101         struct pnp_option *option;
102         struct pnp_port *port;
103
104         option = pnp_build_option(dev, IORESOURCE_IO, option_flags);
105         if (!option)
106                 return -ENOMEM;
107
108         port = &option->u.port;
109         port->min = min;
110         port->max = max;
111         port->align = align;
112         port->size = size;
113         port->flags = flags;
114
115         dbg_pnp_show_option(dev, option);
116         return 0;
117 }
118
119 int pnp_register_mem_resource(struct pnp_dev *dev, unsigned int option_flags,
120                               resource_size_t min, resource_size_t max,
121                               resource_size_t align, resource_size_t size,
122                               unsigned char flags)
123 {
124         struct pnp_option *option;
125         struct pnp_mem *mem;
126
127         option = pnp_build_option(dev, IORESOURCE_MEM, option_flags);
128         if (!option)
129                 return -ENOMEM;
130
131         mem = &option->u.mem;
132         mem->min = min;
133         mem->max = max;
134         mem->align = align;
135         mem->size = size;
136         mem->flags = flags;
137
138         dbg_pnp_show_option(dev, option);
139         return 0;
140 }
141
142 void pnp_free_options(struct pnp_dev *dev)
143 {
144         struct pnp_option *option, *tmp;
145
146         list_for_each_entry_safe(option, tmp, &dev->options, list) {
147                 list_del(&option->list);
148                 kfree(option);
149         }
150 }
151
152 /*
153  * resource validity checking
154  */
155
156 #define length(start, end) (*(end) - *(start) + 1)
157
158 /* Two ranges conflict if one doesn't end before the other starts */
159 #define ranged_conflict(starta, enda, startb, endb) \
160         !((*(enda) < *(startb)) || (*(endb) < *(starta)))
161
162 #define cannot_compare(flags) \
163 ((flags) & IORESOURCE_DISABLED)
164
165 int pnp_check_port(struct pnp_dev *dev, struct resource *res)
166 {
167         int i;
168         struct pnp_dev *tdev;
169         struct resource *tres;
170         resource_size_t *port, *end, *tport, *tend;
171
172         port = &res->start;
173         end = &res->end;
174
175         /* if the resource doesn't exist, don't complain about it */
176         if (cannot_compare(res->flags))
177                 return 1;
178
179         /* check if the resource is already in use, skip if the
180          * device is active because it itself may be in use */
181         if (!dev->active) {
182                 if (__check_region(&ioport_resource, *port, length(port, end)))
183                         return 0;
184         }
185
186         /* check if the resource is reserved */
187         for (i = 0; i < 8; i++) {
188                 int rport = pnp_reserve_io[i << 1];
189                 int rend = pnp_reserve_io[(i << 1) + 1] + rport - 1;
190                 if (ranged_conflict(port, end, &rport, &rend))
191                         return 0;
192         }
193
194         /* check for internal conflicts */
195         for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IO, i)); i++) {
196                 if (tres != res && tres->flags & IORESOURCE_IO) {
197                         tport = &tres->start;
198                         tend = &tres->end;
199                         if (ranged_conflict(port, end, tport, tend))
200                                 return 0;
201                 }
202         }
203
204         /* check for conflicts with other pnp devices */
205         pnp_for_each_dev(tdev) {
206                 if (tdev == dev)
207                         continue;
208                 for (i = 0;
209                      (tres = pnp_get_resource(tdev, IORESOURCE_IO, i));
210                      i++) {
211                         if (tres->flags & IORESOURCE_IO) {
212                                 if (cannot_compare(tres->flags))
213                                         continue;
214                                 if (tres->flags & IORESOURCE_WINDOW)
215                                         continue;
216                                 tport = &tres->start;
217                                 tend = &tres->end;
218                                 if (ranged_conflict(port, end, tport, tend))
219                                         return 0;
220                         }
221                 }
222         }
223
224         return 1;
225 }
226
227 int pnp_check_mem(struct pnp_dev *dev, struct resource *res)
228 {
229         int i;
230         struct pnp_dev *tdev;
231         struct resource *tres;
232         resource_size_t *addr, *end, *taddr, *tend;
233
234         addr = &res->start;
235         end = &res->end;
236
237         /* if the resource doesn't exist, don't complain about it */
238         if (cannot_compare(res->flags))
239                 return 1;
240
241         /* check if the resource is already in use, skip if the
242          * device is active because it itself may be in use */
243         if (!dev->active) {
244                 if (check_mem_region(*addr, length(addr, end)))
245                         return 0;
246         }
247
248         /* check if the resource is reserved */
249         for (i = 0; i < 8; i++) {
250                 int raddr = pnp_reserve_mem[i << 1];
251                 int rend = pnp_reserve_mem[(i << 1) + 1] + raddr - 1;
252                 if (ranged_conflict(addr, end, &raddr, &rend))
253                         return 0;
254         }
255
256         /* check for internal conflicts */
257         for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_MEM, i)); i++) {
258                 if (tres != res && tres->flags & IORESOURCE_MEM) {
259                         taddr = &tres->start;
260                         tend = &tres->end;
261                         if (ranged_conflict(addr, end, taddr, tend))
262                                 return 0;
263                 }
264         }
265
266         /* check for conflicts with other pnp devices */
267         pnp_for_each_dev(tdev) {
268                 if (tdev == dev)
269                         continue;
270                 for (i = 0;
271                      (tres = pnp_get_resource(tdev, IORESOURCE_MEM, i));
272                      i++) {
273                         if (tres->flags & IORESOURCE_MEM) {
274                                 if (cannot_compare(tres->flags))
275                                         continue;
276                                 if (tres->flags & IORESOURCE_WINDOW)
277                                         continue;
278                                 taddr = &tres->start;
279                                 tend = &tres->end;
280                                 if (ranged_conflict(addr, end, taddr, tend))
281                                         return 0;
282                         }
283                 }
284         }
285
286         return 1;
287 }
288
289 static irqreturn_t pnp_test_handler(int irq, void *dev_id)
290 {
291         return IRQ_HANDLED;
292 }
293
294 #ifdef CONFIG_PCI
295 static int pci_dev_uses_irq(struct pnp_dev *pnp, struct pci_dev *pci,
296                             unsigned int irq)
297 {
298         u32 class;
299         u8 progif;
300
301         if (pci->irq == irq) {
302                 pnp_dbg(&pnp->dev, "  device %s using irq %d\n",
303                         pci_name(pci), irq);
304                 return 1;
305         }
306
307         /*
308          * See pci_setup_device() and ata_pci_sff_activate_host() for
309          * similar IDE legacy detection.
310          */
311         pci_read_config_dword(pci, PCI_CLASS_REVISION, &class);
312         class >>= 8;            /* discard revision ID */
313         progif = class & 0xff;
314         class >>= 8;
315
316         if (class == PCI_CLASS_STORAGE_IDE) {
317                 /*
318                  * Unless both channels are native-PCI mode only,
319                  * treat the compatibility IRQs as busy.
320                  */
321                 if ((progif & 0x5) != 0x5)
322                         if (pci_get_legacy_ide_irq(pci, 0) == irq ||
323                             pci_get_legacy_ide_irq(pci, 1) == irq) {
324                                 pnp_dbg(&pnp->dev, "  legacy IDE device %s "
325                                         "using irq %d\n", pci_name(pci), irq);
326                                 return 1;
327                         }
328         }
329
330         return 0;
331 }
332 #endif
333
334 static int pci_uses_irq(struct pnp_dev *pnp, unsigned int irq)
335 {
336 #ifdef CONFIG_PCI
337         struct pci_dev *pci = NULL;
338
339         for_each_pci_dev(pci) {
340                 if (pci_dev_uses_irq(pnp, pci, irq)) {
341                         pci_dev_put(pci);
342                         return 1;
343                 }
344         }
345 #endif
346         return 0;
347 }
348
349 int pnp_check_irq(struct pnp_dev *dev, struct resource *res)
350 {
351         int i;
352         struct pnp_dev *tdev;
353         struct resource *tres;
354         resource_size_t *irq;
355
356         irq = &res->start;
357
358         /* if the resource doesn't exist, don't complain about it */
359         if (cannot_compare(res->flags))
360                 return 1;
361
362         /* check if the resource is valid */
363         if (*irq < 0 || *irq > 15)
364                 return 0;
365
366         /* check if the resource is reserved */
367         for (i = 0; i < 16; i++) {
368                 if (pnp_reserve_irq[i] == *irq)
369                         return 0;
370         }
371
372         /* check for internal conflicts */
373         for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IRQ, i)); i++) {
374                 if (tres != res && tres->flags & IORESOURCE_IRQ) {
375                         if (tres->start == *irq)
376                                 return 0;
377                 }
378         }
379
380         /* check if the resource is being used by a pci device */
381         if (pci_uses_irq(dev, *irq))
382                 return 0;
383
384         /* check if the resource is already in use, skip if the
385          * device is active because it itself may be in use */
386         if (!dev->active) {
387                 if (request_irq(*irq, pnp_test_handler,
388                                 IRQF_DISABLED | IRQF_PROBE_SHARED, "pnp", NULL))
389                         return 0;
390                 free_irq(*irq, NULL);
391         }
392
393         /* check for conflicts with other pnp devices */
394         pnp_for_each_dev(tdev) {
395                 if (tdev == dev)
396                         continue;
397                 for (i = 0;
398                      (tres = pnp_get_resource(tdev, IORESOURCE_IRQ, i));
399                      i++) {
400                         if (tres->flags & IORESOURCE_IRQ) {
401                                 if (cannot_compare(tres->flags))
402                                         continue;
403                                 if (tres->start == *irq)
404                                         return 0;
405                         }
406                 }
407         }
408
409         return 1;
410 }
411
412 int pnp_check_dma(struct pnp_dev *dev, struct resource *res)
413 {
414 #ifndef CONFIG_IA64
415         int i;
416         struct pnp_dev *tdev;
417         struct resource *tres;
418         resource_size_t *dma;
419
420         dma = &res->start;
421
422         /* if the resource doesn't exist, don't complain about it */
423         if (cannot_compare(res->flags))
424                 return 1;
425
426         /* check if the resource is valid */
427         if (*dma < 0 || *dma == 4 || *dma > 7)
428                 return 0;
429
430         /* check if the resource is reserved */
431         for (i = 0; i < 8; i++) {
432                 if (pnp_reserve_dma[i] == *dma)
433                         return 0;
434         }
435
436         /* check for internal conflicts */
437         for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_DMA, i)); i++) {
438                 if (tres != res && tres->flags & IORESOURCE_DMA) {
439                         if (tres->start == *dma)
440                                 return 0;
441                 }
442         }
443
444         /* check if the resource is already in use, skip if the
445          * device is active because it itself may be in use */
446         if (!dev->active) {
447                 if (request_dma(*dma, "pnp"))
448                         return 0;
449                 free_dma(*dma);
450         }
451
452         /* check for conflicts with other pnp devices */
453         pnp_for_each_dev(tdev) {
454                 if (tdev == dev)
455                         continue;
456                 for (i = 0;
457                      (tres = pnp_get_resource(tdev, IORESOURCE_DMA, i));
458                      i++) {
459                         if (tres->flags & IORESOURCE_DMA) {
460                                 if (cannot_compare(tres->flags))
461                                         continue;
462                                 if (tres->start == *dma)
463                                         return 0;
464                         }
465                 }
466         }
467
468         return 1;
469 #else
470         /* IA64 does not have legacy DMA */
471         return 0;
472 #endif
473 }
474
475 unsigned long pnp_resource_type(struct resource *res)
476 {
477         return res->flags & (IORESOURCE_IO  | IORESOURCE_MEM |
478                              IORESOURCE_IRQ | IORESOURCE_DMA |
479                              IORESOURCE_BUS);
480 }
481
482 struct resource *pnp_get_resource(struct pnp_dev *dev,
483                                   unsigned long type, unsigned int num)
484 {
485         struct pnp_resource *pnp_res;
486         struct resource *res;
487
488         list_for_each_entry(pnp_res, &dev->resources, list) {
489                 res = &pnp_res->res;
490                 if (pnp_resource_type(res) == type && num-- == 0)
491                         return res;
492         }
493         return NULL;
494 }
495 EXPORT_SYMBOL(pnp_get_resource);
496
497 static struct pnp_resource *pnp_new_resource(struct pnp_dev *dev)
498 {
499         struct pnp_resource *pnp_res;
500
501         pnp_res = kzalloc(sizeof(struct pnp_resource), GFP_KERNEL);
502         if (!pnp_res)
503                 return NULL;
504
505         list_add_tail(&pnp_res->list, &dev->resources);
506         return pnp_res;
507 }
508
509 struct pnp_resource *pnp_add_irq_resource(struct pnp_dev *dev, int irq,
510                                           int flags)
511 {
512         struct pnp_resource *pnp_res;
513         struct resource *res;
514
515         pnp_res = pnp_new_resource(dev);
516         if (!pnp_res) {
517                 dev_err(&dev->dev, "can't add resource for IRQ %d\n", irq);
518                 return NULL;
519         }
520
521         res = &pnp_res->res;
522         res->flags = IORESOURCE_IRQ | flags;
523         res->start = irq;
524         res->end = irq;
525
526         pnp_dbg(&dev->dev, "  add %pr\n", res);
527         return pnp_res;
528 }
529
530 struct pnp_resource *pnp_add_dma_resource(struct pnp_dev *dev, int dma,
531                                           int flags)
532 {
533         struct pnp_resource *pnp_res;
534         struct resource *res;
535
536         pnp_res = pnp_new_resource(dev);
537         if (!pnp_res) {
538                 dev_err(&dev->dev, "can't add resource for DMA %d\n", dma);
539                 return NULL;
540         }
541
542         res = &pnp_res->res;
543         res->flags = IORESOURCE_DMA | flags;
544         res->start = dma;
545         res->end = dma;
546
547         pnp_dbg(&dev->dev, "  add %pr\n", res);
548         return pnp_res;
549 }
550
551 struct pnp_resource *pnp_add_io_resource(struct pnp_dev *dev,
552                                          resource_size_t start,
553                                          resource_size_t end, int flags)
554 {
555         struct pnp_resource *pnp_res;
556         struct resource *res;
557
558         pnp_res = pnp_new_resource(dev);
559         if (!pnp_res) {
560                 dev_err(&dev->dev, "can't add resource for IO %#llx-%#llx\n",
561                         (unsigned long long) start,
562                         (unsigned long long) end);
563                 return NULL;
564         }
565
566         res = &pnp_res->res;
567         res->flags = IORESOURCE_IO | flags;
568         res->start = start;
569         res->end = end;
570
571         pnp_dbg(&dev->dev, "  add %pr\n", res);
572         return pnp_res;
573 }
574
575 struct pnp_resource *pnp_add_mem_resource(struct pnp_dev *dev,
576                                           resource_size_t start,
577                                           resource_size_t end, int flags)
578 {
579         struct pnp_resource *pnp_res;
580         struct resource *res;
581
582         pnp_res = pnp_new_resource(dev);
583         if (!pnp_res) {
584                 dev_err(&dev->dev, "can't add resource for MEM %#llx-%#llx\n",
585                         (unsigned long long) start,
586                         (unsigned long long) end);
587                 return NULL;
588         }
589
590         res = &pnp_res->res;
591         res->flags = IORESOURCE_MEM | flags;
592         res->start = start;
593         res->end = end;
594
595         pnp_dbg(&dev->dev, "  add %pr\n", res);
596         return pnp_res;
597 }
598
599 struct pnp_resource *pnp_add_bus_resource(struct pnp_dev *dev,
600                                           resource_size_t start,
601                                           resource_size_t end)
602 {
603         struct pnp_resource *pnp_res;
604         struct resource *res;
605
606         pnp_res = pnp_new_resource(dev);
607         if (!pnp_res) {
608                 dev_err(&dev->dev, "can't add resource for BUS %#llx-%#llx\n",
609                         (unsigned long long) start,
610                         (unsigned long long) end);
611                 return NULL;
612         }
613
614         res = &pnp_res->res;
615         res->flags = IORESOURCE_BUS;
616         res->start = start;
617         res->end = end;
618
619         pnp_dbg(&dev->dev, "  add %pr\n", res);
620         return pnp_res;
621 }
622
623 /*
624  * Determine whether the specified resource is a possible configuration
625  * for this device.
626  */
627 int pnp_possible_config(struct pnp_dev *dev, int type, resource_size_t start,
628                         resource_size_t size)
629 {
630         struct pnp_option *option;
631         struct pnp_port *port;
632         struct pnp_mem *mem;
633         struct pnp_irq *irq;
634         struct pnp_dma *dma;
635
636         list_for_each_entry(option, &dev->options, list) {
637                 if (option->type != type)
638                         continue;
639
640                 switch (option->type) {
641                 case IORESOURCE_IO:
642                         port = &option->u.port;
643                         if (port->min == start && port->size == size)
644                                 return 1;
645                         break;
646                 case IORESOURCE_MEM:
647                         mem = &option->u.mem;
648                         if (mem->min == start && mem->size == size)
649                                 return 1;
650                         break;
651                 case IORESOURCE_IRQ:
652                         irq = &option->u.irq;
653                         if (start < PNP_IRQ_NR &&
654                             test_bit(start, irq->map.bits))
655                                 return 1;
656                         break;
657                 case IORESOURCE_DMA:
658                         dma = &option->u.dma;
659                         if (dma->map & (1 << start))
660                                 return 1;
661                         break;
662                 }
663         }
664
665         return 0;
666 }
667 EXPORT_SYMBOL(pnp_possible_config);
668
669 int pnp_range_reserved(resource_size_t start, resource_size_t end)
670 {
671         struct pnp_dev *dev;
672         struct pnp_resource *pnp_res;
673         resource_size_t *dev_start, *dev_end;
674
675         pnp_for_each_dev(dev) {
676                 list_for_each_entry(pnp_res, &dev->resources, list) {
677                         dev_start = &pnp_res->res.start;
678                         dev_end   = &pnp_res->res.end;
679                         if (ranged_conflict(&start, &end, dev_start, dev_end))
680                                 return 1;
681                 }
682         }
683         return 0;
684 }
685 EXPORT_SYMBOL(pnp_range_reserved);
686
687 /* format is: pnp_reserve_irq=irq1[,irq2] .... */
688 static int __init pnp_setup_reserve_irq(char *str)
689 {
690         int i;
691
692         for (i = 0; i < 16; i++)
693                 if (get_option(&str, &pnp_reserve_irq[i]) != 2)
694                         break;
695         return 1;
696 }
697
698 __setup("pnp_reserve_irq=", pnp_setup_reserve_irq);
699
700 /* format is: pnp_reserve_dma=dma1[,dma2] .... */
701 static int __init pnp_setup_reserve_dma(char *str)
702 {
703         int i;
704
705         for (i = 0; i < 8; i++)
706                 if (get_option(&str, &pnp_reserve_dma[i]) != 2)
707                         break;
708         return 1;
709 }
710
711 __setup("pnp_reserve_dma=", pnp_setup_reserve_dma);
712
713 /* format is: pnp_reserve_io=io1,size1[,io2,size2] .... */
714 static int __init pnp_setup_reserve_io(char *str)
715 {
716         int i;
717
718         for (i = 0; i < 16; i++)
719                 if (get_option(&str, &pnp_reserve_io[i]) != 2)
720                         break;
721         return 1;
722 }
723
724 __setup("pnp_reserve_io=", pnp_setup_reserve_io);
725
726 /* format is: pnp_reserve_mem=mem1,size1[,mem2,size2] .... */
727 static int __init pnp_setup_reserve_mem(char *str)
728 {
729         int i;
730
731         for (i = 0; i < 16; i++)
732                 if (get_option(&str, &pnp_reserve_mem[i]) != 2)
733                         break;
734         return 1;
735 }
736
737 __setup("pnp_reserve_mem=", pnp_setup_reserve_mem);