pci/xen: When free-ing MSI-X/MSI irq->desc also use generic code.
[linux-2.6/x86.git] / drivers / pnp / resource.c
bloba925e6b63d72cff9953672c285210de80c3c488e
1 /*
2 * resource.c - Contains functions for registering and analyzing resource information
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 */
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>
22 #include <linux/pnp.h>
23 #include "base.h"
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 */
31 * option registration
34 struct pnp_option *pnp_build_option(struct pnp_dev *dev, unsigned long type,
35 unsigned int option_flags)
37 struct pnp_option *option;
39 option = kzalloc(sizeof(struct pnp_option), GFP_KERNEL);
40 if (!option)
41 return NULL;
43 option->flags = option_flags;
44 option->type = type;
46 list_add_tail(&option->list, &dev->options);
47 return option;
50 int pnp_register_irq_resource(struct pnp_dev *dev, unsigned int option_flags,
51 pnp_irq_mask_t *map, unsigned char flags)
53 struct pnp_option *option;
54 struct pnp_irq *irq;
56 option = pnp_build_option(dev, IORESOURCE_IRQ, option_flags);
57 if (!option)
58 return -ENOMEM;
60 irq = &option->u.irq;
61 irq->map = *map;
62 irq->flags = flags;
64 #ifdef CONFIG_PCI
66 int i;
68 for (i = 0; i < 16; i++)
69 if (test_bit(i, irq->map.bits))
70 pcibios_penalize_isa_irq(i, 0);
72 #endif
74 dbg_pnp_show_option(dev, option);
75 return 0;
78 int pnp_register_dma_resource(struct pnp_dev *dev, unsigned int option_flags,
79 unsigned char map, unsigned char flags)
81 struct pnp_option *option;
82 struct pnp_dma *dma;
84 option = pnp_build_option(dev, IORESOURCE_DMA, option_flags);
85 if (!option)
86 return -ENOMEM;
88 dma = &option->u.dma;
89 dma->map = map;
90 dma->flags = flags;
92 dbg_pnp_show_option(dev, option);
93 return 0;
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)
101 struct pnp_option *option;
102 struct pnp_port *port;
104 option = pnp_build_option(dev, IORESOURCE_IO, option_flags);
105 if (!option)
106 return -ENOMEM;
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;
115 dbg_pnp_show_option(dev, option);
116 return 0;
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)
124 struct pnp_option *option;
125 struct pnp_mem *mem;
127 option = pnp_build_option(dev, IORESOURCE_MEM, option_flags);
128 if (!option)
129 return -ENOMEM;
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;
138 dbg_pnp_show_option(dev, option);
139 return 0;
142 void pnp_free_options(struct pnp_dev *dev)
144 struct pnp_option *option, *tmp;
146 list_for_each_entry_safe(option, tmp, &dev->options, list) {
147 list_del(&option->list);
148 kfree(option);
153 * resource validity checking
156 #define length(start, end) (*(end) - *(start) + 1)
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)))
162 #define cannot_compare(flags) \
163 ((flags) & IORESOURCE_DISABLED)
165 int pnp_check_port(struct pnp_dev *dev, struct resource *res)
167 int i;
168 struct pnp_dev *tdev;
169 struct resource *tres;
170 resource_size_t *port, *end, *tport, *tend;
172 port = &res->start;
173 end = &res->end;
175 /* if the resource doesn't exist, don't complain about it */
176 if (cannot_compare(res->flags))
177 return 1;
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;
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;
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;
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;
224 return 1;
227 int pnp_check_mem(struct pnp_dev *dev, struct resource *res)
229 int i;
230 struct pnp_dev *tdev;
231 struct resource *tres;
232 resource_size_t *addr, *end, *taddr, *tend;
234 addr = &res->start;
235 end = &res->end;
237 /* if the resource doesn't exist, don't complain about it */
238 if (cannot_compare(res->flags))
239 return 1;
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;
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;
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;
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;
286 return 1;
289 static irqreturn_t pnp_test_handler(int irq, void *dev_id)
291 return IRQ_HANDLED;
294 #ifdef CONFIG_PCI
295 static int pci_dev_uses_irq(struct pnp_dev *pnp, struct pci_dev *pci,
296 unsigned int irq)
298 u32 class;
299 u8 progif;
301 if (pci->irq == irq) {
302 pnp_dbg(&pnp->dev, " device %s using irq %d\n",
303 pci_name(pci), irq);
304 return 1;
308 * See pci_setup_device() and ata_pci_sff_activate_host() for
309 * similar IDE legacy detection.
311 pci_read_config_dword(pci, PCI_CLASS_REVISION, &class);
312 class >>= 8; /* discard revision ID */
313 progif = class & 0xff;
314 class >>= 8;
316 if (class == PCI_CLASS_STORAGE_IDE) {
318 * Unless both channels are native-PCI mode only,
319 * treat the compatibility IRQs as busy.
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;
330 return 0;
332 #endif
334 static int pci_uses_irq(struct pnp_dev *pnp, unsigned int irq)
336 #ifdef CONFIG_PCI
337 struct pci_dev *pci = NULL;
339 for_each_pci_dev(pci) {
340 if (pci_dev_uses_irq(pnp, pci, irq)) {
341 pci_dev_put(pci);
342 return 1;
345 #endif
346 return 0;
349 int pnp_check_irq(struct pnp_dev *dev, struct resource *res)
351 int i;
352 struct pnp_dev *tdev;
353 struct resource *tres;
354 resource_size_t *irq;
356 irq = &res->start;
358 /* if the resource doesn't exist, don't complain about it */
359 if (cannot_compare(res->flags))
360 return 1;
362 /* check if the resource is valid */
363 if (*irq < 0 || *irq > 15)
364 return 0;
366 /* check if the resource is reserved */
367 for (i = 0; i < 16; i++) {
368 if (pnp_reserve_irq[i] == *irq)
369 return 0;
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;
380 /* check if the resource is being used by a pci device */
381 if (pci_uses_irq(dev, *irq))
382 return 0;
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);
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;
409 return 1;
412 int pnp_check_dma(struct pnp_dev *dev, struct resource *res)
414 #ifndef CONFIG_IA64
415 int i;
416 struct pnp_dev *tdev;
417 struct resource *tres;
418 resource_size_t *dma;
420 dma = &res->start;
422 /* if the resource doesn't exist, don't complain about it */
423 if (cannot_compare(res->flags))
424 return 1;
426 /* check if the resource is valid */
427 if (*dma < 0 || *dma == 4 || *dma > 7)
428 return 0;
430 /* check if the resource is reserved */
431 for (i = 0; i < 8; i++) {
432 if (pnp_reserve_dma[i] == *dma)
433 return 0;
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;
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);
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;
468 return 1;
469 #else
470 /* IA64 does not have legacy DMA */
471 return 0;
472 #endif
475 unsigned long pnp_resource_type(struct resource *res)
477 return res->flags & (IORESOURCE_IO | IORESOURCE_MEM |
478 IORESOURCE_IRQ | IORESOURCE_DMA |
479 IORESOURCE_BUS);
482 struct resource *pnp_get_resource(struct pnp_dev *dev,
483 unsigned long type, unsigned int num)
485 struct pnp_resource *pnp_res;
486 struct resource *res;
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;
493 return NULL;
495 EXPORT_SYMBOL(pnp_get_resource);
497 static struct pnp_resource *pnp_new_resource(struct pnp_dev *dev)
499 struct pnp_resource *pnp_res;
501 pnp_res = kzalloc(sizeof(struct pnp_resource), GFP_KERNEL);
502 if (!pnp_res)
503 return NULL;
505 list_add_tail(&pnp_res->list, &dev->resources);
506 return pnp_res;
509 struct pnp_resource *pnp_add_irq_resource(struct pnp_dev *dev, int irq,
510 int flags)
512 struct pnp_resource *pnp_res;
513 struct resource *res;
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;
521 res = &pnp_res->res;
522 res->flags = IORESOURCE_IRQ | flags;
523 res->start = irq;
524 res->end = irq;
526 dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);
527 return pnp_res;
530 struct pnp_resource *pnp_add_dma_resource(struct pnp_dev *dev, int dma,
531 int flags)
533 struct pnp_resource *pnp_res;
534 struct resource *res;
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;
542 res = &pnp_res->res;
543 res->flags = IORESOURCE_DMA | flags;
544 res->start = dma;
545 res->end = dma;
547 dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);
548 return pnp_res;
551 struct pnp_resource *pnp_add_io_resource(struct pnp_dev *dev,
552 resource_size_t start,
553 resource_size_t end, int flags)
555 struct pnp_resource *pnp_res;
556 struct resource *res;
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;
566 res = &pnp_res->res;
567 res->flags = IORESOURCE_IO | flags;
568 res->start = start;
569 res->end = end;
571 dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);
572 return pnp_res;
575 struct pnp_resource *pnp_add_mem_resource(struct pnp_dev *dev,
576 resource_size_t start,
577 resource_size_t end, int flags)
579 struct pnp_resource *pnp_res;
580 struct resource *res;
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;
590 res = &pnp_res->res;
591 res->flags = IORESOURCE_MEM | flags;
592 res->start = start;
593 res->end = end;
595 dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);
596 return pnp_res;
599 struct pnp_resource *pnp_add_bus_resource(struct pnp_dev *dev,
600 resource_size_t start,
601 resource_size_t end)
603 struct pnp_resource *pnp_res;
604 struct resource *res;
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;
614 res = &pnp_res->res;
615 res->flags = IORESOURCE_BUS;
616 res->start = start;
617 res->end = end;
619 dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);
620 return pnp_res;
624 * Determine whether the specified resource is a possible configuration
625 * for this device.
627 int pnp_possible_config(struct pnp_dev *dev, int type, resource_size_t start,
628 resource_size_t size)
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;
636 list_for_each_entry(option, &dev->options, list) {
637 if (option->type != type)
638 continue;
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;
665 return 0;
667 EXPORT_SYMBOL(pnp_possible_config);
669 int pnp_range_reserved(resource_size_t start, resource_size_t end)
671 struct pnp_dev *dev;
672 struct pnp_resource *pnp_res;
673 resource_size_t *dev_start, *dev_end;
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;
683 return 0;
685 EXPORT_SYMBOL(pnp_range_reserved);
687 /* format is: pnp_reserve_irq=irq1[,irq2] .... */
688 static int __init pnp_setup_reserve_irq(char *str)
690 int i;
692 for (i = 0; i < 16; i++)
693 if (get_option(&str, &pnp_reserve_irq[i]) != 2)
694 break;
695 return 1;
698 __setup("pnp_reserve_irq=", pnp_setup_reserve_irq);
700 /* format is: pnp_reserve_dma=dma1[,dma2] .... */
701 static int __init pnp_setup_reserve_dma(char *str)
703 int i;
705 for (i = 0; i < 8; i++)
706 if (get_option(&str, &pnp_reserve_dma[i]) != 2)
707 break;
708 return 1;
711 __setup("pnp_reserve_dma=", pnp_setup_reserve_dma);
713 /* format is: pnp_reserve_io=io1,size1[,io2,size2] .... */
714 static int __init pnp_setup_reserve_io(char *str)
716 int i;
718 for (i = 0; i < 16; i++)
719 if (get_option(&str, &pnp_reserve_io[i]) != 2)
720 break;
721 return 1;
724 __setup("pnp_reserve_io=", pnp_setup_reserve_io);
726 /* format is: pnp_reserve_mem=mem1,size1[,mem2,size2] .... */
727 static int __init pnp_setup_reserve_mem(char *str)
729 int i;
731 for (i = 0; i < 16; i++)
732 if (get_option(&str, &pnp_reserve_mem[i]) != 2)
733 break;
734 return 1;
737 __setup("pnp_reserve_mem=", pnp_setup_reserve_mem);