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>
8 #include <linux/module.h>
9 #include <linux/errno.h>
10 #include <linux/interrupt.h>
11 #include <linux/kernel.h>
15 #include <linux/pci.h>
16 #include <linux/ioport.h>
17 #include <linux/init.h>
19 #include <linux/pnp.h>
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 */
31 struct pnp_option *pnp_build_option(int priority)
33 struct pnp_option *option = pnp_alloc(sizeof(struct pnp_option));
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;
46 struct pnp_option *pnp_register_independent_option(struct pnp_dev *dev)
48 struct pnp_option *option;
50 option = pnp_build_option(PNP_RES_PRIORITY_PREFERRED);
52 /* this should never happen but if it does we'll try to continue */
54 dev_err(&dev->dev, "independent resource already registered\n");
55 dev->independent = option;
57 dev_dbg(&dev->dev, "new independent option\n");
61 struct pnp_option *pnp_register_dependent_option(struct pnp_dev *dev,
64 struct pnp_option *option;
66 option = pnp_build_option(priority);
69 struct pnp_option *parent = dev->dependent;
71 parent = parent->next;
72 parent->next = option;
74 dev->dependent = option;
76 dev_dbg(&dev->dev, "new dependent option (priority %#x)\n", priority);
80 int pnp_register_irq_resource(struct pnp_dev *dev, struct pnp_option *option,
85 char buf[PNP_IRQ_NR]; /* hex-encoded, so this is overkill but safe */
89 while (ptr && ptr->next)
100 for (i = 0; i < 16; i++)
101 if (test_bit(i, data->map.bits))
102 pcibios_penalize_isa_irq(i, 0);
107 bitmap_scnprintf(buf, sizeof(buf), data->map.bits, PNP_IRQ_NR);
108 dev_dbg(&dev->dev, " irq bitmask %s flags %#x\n", buf,
114 int pnp_register_dma_resource(struct pnp_dev *dev, struct pnp_option *option,
115 struct pnp_dma *data)
120 while (ptr && ptr->next)
127 dev_dbg(&dev->dev, " dma bitmask %#x flags %#x\n", data->map,
132 int pnp_register_port_resource(struct pnp_dev *dev, struct pnp_option *option,
133 struct pnp_port *data)
135 struct pnp_port *ptr;
138 while (ptr && ptr->next)
145 dev_dbg(&dev->dev, " io "
146 "min %#llx max %#llx align %lld size %lld flags %#x\n",
147 (unsigned long long) data->min,
148 (unsigned long long) data->max,
149 (unsigned long long) data->align,
150 (unsigned long long) data->size, data->flags);
154 int pnp_register_mem_resource(struct pnp_dev *dev, struct pnp_option *option,
155 struct pnp_mem *data)
160 while (ptr && ptr->next)
167 dev_dbg(&dev->dev, " mem "
168 "min %#llx max %#llx align %lld size %lld flags %#x\n",
169 (unsigned long long) data->min,
170 (unsigned long long) data->max,
171 (unsigned long long) data->align,
172 (unsigned long long) data->size, data->flags);
176 static void pnp_free_port(struct pnp_port *port)
178 struct pnp_port *next;
187 static void pnp_free_irq(struct pnp_irq *irq)
189 struct pnp_irq *next;
198 static void pnp_free_dma(struct pnp_dma *dma)
200 struct pnp_dma *next;
209 static void pnp_free_mem(struct pnp_mem *mem)
211 struct pnp_mem *next;
220 void pnp_free_option(struct pnp_option *option)
222 struct pnp_option *next;
226 pnp_free_port(option->port);
227 pnp_free_irq(option->irq);
228 pnp_free_dma(option->dma);
229 pnp_free_mem(option->mem);
236 * resource validity checking
239 #define length(start, end) (*(end) - *(start) + 1)
241 /* Two ranges conflict if one doesn't end before the other starts */
242 #define ranged_conflict(starta, enda, startb, endb) \
243 !((*(enda) < *(startb)) || (*(endb) < *(starta)))
245 #define cannot_compare(flags) \
246 ((flags) & IORESOURCE_DISABLED)
248 int pnp_check_port(struct pnp_dev *dev, struct resource *res)
251 struct pnp_dev *tdev;
252 struct resource *tres;
253 resource_size_t *port, *end, *tport, *tend;
258 /* if the resource doesn't exist, don't complain about it */
259 if (cannot_compare(res->flags))
262 /* check if the resource is already in use, skip if the
263 * device is active because it itself may be in use */
265 if (__check_region(&ioport_resource, *port, length(port, end)))
269 /* check if the resource is reserved */
270 for (i = 0; i < 8; i++) {
271 int rport = pnp_reserve_io[i << 1];
272 int rend = pnp_reserve_io[(i << 1) + 1] + rport - 1;
273 if (ranged_conflict(port, end, &rport, &rend))
277 /* check for internal conflicts */
278 for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IO, i)); i++) {
279 if (tres != res && tres->flags & IORESOURCE_IO) {
280 tport = &tres->start;
282 if (ranged_conflict(port, end, tport, tend))
287 /* check for conflicts with other pnp devices */
288 pnp_for_each_dev(tdev) {
292 (tres = pnp_get_resource(tdev, IORESOURCE_IO, i));
294 if (tres->flags & IORESOURCE_IO) {
295 if (cannot_compare(tres->flags))
297 tport = &tres->start;
299 if (ranged_conflict(port, end, tport, tend))
308 int pnp_check_mem(struct pnp_dev *dev, struct resource *res)
311 struct pnp_dev *tdev;
312 struct resource *tres;
313 resource_size_t *addr, *end, *taddr, *tend;
318 /* if the resource doesn't exist, don't complain about it */
319 if (cannot_compare(res->flags))
322 /* check if the resource is already in use, skip if the
323 * device is active because it itself may be in use */
325 if (check_mem_region(*addr, length(addr, end)))
329 /* check if the resource is reserved */
330 for (i = 0; i < 8; i++) {
331 int raddr = pnp_reserve_mem[i << 1];
332 int rend = pnp_reserve_mem[(i << 1) + 1] + raddr - 1;
333 if (ranged_conflict(addr, end, &raddr, &rend))
337 /* check for internal conflicts */
338 for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_MEM, i)); i++) {
339 if (tres != res && tres->flags & IORESOURCE_MEM) {
340 taddr = &tres->start;
342 if (ranged_conflict(addr, end, taddr, tend))
347 /* check for conflicts with other pnp devices */
348 pnp_for_each_dev(tdev) {
352 (tres = pnp_get_resource(tdev, IORESOURCE_MEM, i));
354 if (tres->flags & IORESOURCE_MEM) {
355 if (cannot_compare(tres->flags))
357 taddr = &tres->start;
359 if (ranged_conflict(addr, end, taddr, tend))
368 static irqreturn_t pnp_test_handler(int irq, void *dev_id)
373 int pnp_check_irq(struct pnp_dev *dev, struct resource *res)
376 struct pnp_dev *tdev;
377 struct resource *tres;
378 resource_size_t *irq;
382 /* if the resource doesn't exist, don't complain about it */
383 if (cannot_compare(res->flags))
386 /* check if the resource is valid */
387 if (*irq < 0 || *irq > 15)
390 /* check if the resource is reserved */
391 for (i = 0; i < 16; i++) {
392 if (pnp_reserve_irq[i] == *irq)
396 /* check for internal conflicts */
397 for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IRQ, i)); i++) {
398 if (tres != res && tres->flags & IORESOURCE_IRQ) {
399 if (tres->start == *irq)
405 /* check if the resource is being used by a pci device */
407 struct pci_dev *pci = NULL;
408 for_each_pci_dev(pci) {
409 if (pci->irq == *irq) {
417 /* check if the resource is already in use, skip if the
418 * device is active because it itself may be in use */
420 if (request_irq(*irq, pnp_test_handler,
421 IRQF_DISABLED | IRQF_PROBE_SHARED, "pnp", NULL))
423 free_irq(*irq, NULL);
426 /* check for conflicts with other pnp devices */
427 pnp_for_each_dev(tdev) {
431 (tres = pnp_get_resource(tdev, IORESOURCE_IRQ, i));
433 if (tres->flags & IORESOURCE_IRQ) {
434 if (cannot_compare(tres->flags))
436 if (tres->start == *irq)
445 int pnp_check_dma(struct pnp_dev *dev, struct resource *res)
449 struct pnp_dev *tdev;
450 struct resource *tres;
451 resource_size_t *dma;
455 /* if the resource doesn't exist, don't complain about it */
456 if (cannot_compare(res->flags))
459 /* check if the resource is valid */
460 if (*dma < 0 || *dma == 4 || *dma > 7)
463 /* check if the resource is reserved */
464 for (i = 0; i < 8; i++) {
465 if (pnp_reserve_dma[i] == *dma)
469 /* check for internal conflicts */
470 for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_DMA, i)); i++) {
471 if (tres != res && tres->flags & IORESOURCE_DMA) {
472 if (tres->start == *dma)
477 /* check if the resource is already in use, skip if the
478 * device is active because it itself may be in use */
480 if (request_dma(*dma, "pnp"))
485 /* check for conflicts with other pnp devices */
486 pnp_for_each_dev(tdev) {
490 (tres = pnp_get_resource(tdev, IORESOURCE_DMA, i));
492 if (tres->flags & IORESOURCE_DMA) {
493 if (cannot_compare(tres->flags))
495 if (tres->start == *dma)
503 /* IA64 does not have legacy DMA */
508 int pnp_resource_type(struct resource *res)
510 return res->flags & (IORESOURCE_IO | IORESOURCE_MEM |
511 IORESOURCE_IRQ | IORESOURCE_DMA);
514 struct resource *pnp_get_resource(struct pnp_dev *dev,
515 unsigned int type, unsigned int num)
517 struct pnp_resource *pnp_res;
518 struct resource *res;
520 list_for_each_entry(pnp_res, &dev->resources, list) {
522 if (pnp_resource_type(res) == type && num-- == 0)
527 EXPORT_SYMBOL(pnp_get_resource);
529 static struct pnp_resource *pnp_new_resource(struct pnp_dev *dev)
531 struct pnp_resource *pnp_res;
533 pnp_res = kzalloc(sizeof(struct pnp_resource), GFP_KERNEL);
537 list_add_tail(&pnp_res->list, &dev->resources);
541 struct pnp_resource *pnp_add_irq_resource(struct pnp_dev *dev, int irq,
544 struct pnp_resource *pnp_res;
545 struct resource *res;
547 pnp_res = pnp_new_resource(dev);
549 dev_err(&dev->dev, "can't add resource for IRQ %d\n", irq);
554 res->flags = IORESOURCE_IRQ | flags;
558 dev_dbg(&dev->dev, " add irq %d flags %#x\n", irq, flags);
562 struct pnp_resource *pnp_add_dma_resource(struct pnp_dev *dev, int dma,
565 struct pnp_resource *pnp_res;
566 struct resource *res;
568 pnp_res = pnp_new_resource(dev);
570 dev_err(&dev->dev, "can't add resource for DMA %d\n", dma);
575 res->flags = IORESOURCE_DMA | flags;
579 dev_dbg(&dev->dev, " add dma %d flags %#x\n", dma, flags);
583 struct pnp_resource *pnp_add_io_resource(struct pnp_dev *dev,
584 resource_size_t start,
585 resource_size_t end, int flags)
587 struct pnp_resource *pnp_res;
588 struct resource *res;
590 pnp_res = pnp_new_resource(dev);
592 dev_err(&dev->dev, "can't add resource for IO %#llx-%#llx\n",
593 (unsigned long long) start,
594 (unsigned long long) end);
599 res->flags = IORESOURCE_IO | flags;
603 dev_dbg(&dev->dev, " add io %#llx-%#llx flags %#x\n",
604 (unsigned long long) start, (unsigned long long) end, flags);
608 struct pnp_resource *pnp_add_mem_resource(struct pnp_dev *dev,
609 resource_size_t start,
610 resource_size_t end, int flags)
612 struct pnp_resource *pnp_res;
613 struct resource *res;
615 pnp_res = pnp_new_resource(dev);
617 dev_err(&dev->dev, "can't add resource for MEM %#llx-%#llx\n",
618 (unsigned long long) start,
619 (unsigned long long) end);
624 res->flags = IORESOURCE_MEM | flags;
628 dev_dbg(&dev->dev, " add mem %#llx-%#llx flags %#x\n",
629 (unsigned long long) start, (unsigned long long) end, flags);
633 static int pnp_possible_option(struct pnp_option *option, int type,
634 resource_size_t start, resource_size_t size)
636 struct pnp_option *tmp;
637 struct pnp_port *port;
645 for (tmp = option; tmp; tmp = tmp->next) {
648 for (port = tmp->port; port; port = port->next) {
649 if (port->min == start && port->size == size)
654 for (mem = tmp->mem; mem; mem = mem->next) {
655 if (mem->min == start && mem->size == size)
660 for (irq = tmp->irq; irq; irq = irq->next) {
661 if (start < PNP_IRQ_NR &&
662 test_bit(start, irq->map.bits))
667 for (dma = tmp->dma; dma; dma = dma->next) {
668 if (dma->map & (1 << start))
679 * Determine whether the specified resource is a possible configuration
682 int pnp_possible_config(struct pnp_dev *dev, int type, resource_size_t start,
683 resource_size_t size)
685 if (pnp_possible_option(dev->independent, type, start, size))
688 if (pnp_possible_option(dev->dependent, type, start, size))
693 EXPORT_SYMBOL(pnp_possible_config);
695 /* format is: pnp_reserve_irq=irq1[,irq2] .... */
696 static int __init pnp_setup_reserve_irq(char *str)
700 for (i = 0; i < 16; i++)
701 if (get_option(&str, &pnp_reserve_irq[i]) != 2)
706 __setup("pnp_reserve_irq=", pnp_setup_reserve_irq);
708 /* format is: pnp_reserve_dma=dma1[,dma2] .... */
709 static int __init pnp_setup_reserve_dma(char *str)
713 for (i = 0; i < 8; i++)
714 if (get_option(&str, &pnp_reserve_dma[i]) != 2)
719 __setup("pnp_reserve_dma=", pnp_setup_reserve_dma);
721 /* format is: pnp_reserve_io=io1,size1[,io2,size2] .... */
722 static int __init pnp_setup_reserve_io(char *str)
726 for (i = 0; i < 16; i++)
727 if (get_option(&str, &pnp_reserve_io[i]) != 2)
732 __setup("pnp_reserve_io=", pnp_setup_reserve_io);
734 /* format is: pnp_reserve_mem=mem1,size1[,mem2,size2] .... */
735 static int __init pnp_setup_reserve_mem(char *str)
739 for (i = 0; i < 16; i++)
740 if (get_option(&str, &pnp_reserve_mem[i]) != 2)
745 __setup("pnp_reserve_mem=", pnp_setup_reserve_mem);