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>
10 #include <linux/module.h>
11 #include <linux/errno.h>
12 #include <linux/interrupt.h>
13 #include <linux/kernel.h>
17 #include <linux/pci.h>
18 #include <linux/ioport.h>
19 #include <linux/init.h>
21 #include <linux/pnp.h>
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 */
33 struct pnp_option *pnp_build_option(struct pnp_dev *dev, unsigned long type,
34 unsigned int option_flags)
36 struct pnp_option *option;
38 option = kzalloc(sizeof(struct pnp_option), GFP_KERNEL);
42 option->flags = option_flags;
45 list_add_tail(&option->list, &dev->options);
49 int pnp_register_irq_resource(struct pnp_dev *dev, unsigned int option_flags,
50 pnp_irq_mask_t *map, unsigned char flags)
52 struct pnp_option *option;
55 option = pnp_build_option(dev, IORESOURCE_IRQ, option_flags);
67 for (i = 0; i < 16; i++)
68 if (test_bit(i, irq->map.bits))
69 pcibios_penalize_isa_irq(i, 0);
73 dbg_pnp_show_option(dev, option);
77 int pnp_register_dma_resource(struct pnp_dev *dev, unsigned int option_flags,
78 unsigned char map, unsigned char flags)
80 struct pnp_option *option;
83 option = pnp_build_option(dev, IORESOURCE_DMA, option_flags);
91 dbg_pnp_show_option(dev, option);
95 int pnp_register_port_resource(struct pnp_dev *dev, unsigned int option_flags,
96 resource_size_t min, resource_size_t max,
97 resource_size_t align, resource_size_t size,
100 struct pnp_option *option;
101 struct pnp_port *port;
103 option = pnp_build_option(dev, IORESOURCE_IO, option_flags);
107 port = &option->u.port;
114 dbg_pnp_show_option(dev, option);
118 int pnp_register_mem_resource(struct pnp_dev *dev, unsigned int option_flags,
119 resource_size_t min, resource_size_t max,
120 resource_size_t align, resource_size_t size,
123 struct pnp_option *option;
126 option = pnp_build_option(dev, IORESOURCE_MEM, option_flags);
130 mem = &option->u.mem;
137 dbg_pnp_show_option(dev, option);
141 void pnp_free_options(struct pnp_dev *dev)
143 struct pnp_option *option, *tmp;
145 list_for_each_entry_safe(option, tmp, &dev->options, list) {
146 list_del(&option->list);
152 * resource validity checking
155 #define length(start, end) (*(end) - *(start) + 1)
157 /* Two ranges conflict if one doesn't end before the other starts */
158 #define ranged_conflict(starta, enda, startb, endb) \
159 !((*(enda) < *(startb)) || (*(endb) < *(starta)))
161 #define cannot_compare(flags) \
162 ((flags) & IORESOURCE_DISABLED)
164 int pnp_check_port(struct pnp_dev *dev, struct resource *res)
167 struct pnp_dev *tdev;
168 struct resource *tres;
169 resource_size_t *port, *end, *tport, *tend;
174 /* if the resource doesn't exist, don't complain about it */
175 if (cannot_compare(res->flags))
178 /* check if the resource is already in use, skip if the
179 * device is active because it itself may be in use */
181 if (__check_region(&ioport_resource, *port, length(port, end)))
185 /* check if the resource is reserved */
186 for (i = 0; i < 8; i++) {
187 int rport = pnp_reserve_io[i << 1];
188 int rend = pnp_reserve_io[(i << 1) + 1] + rport - 1;
189 if (ranged_conflict(port, end, &rport, &rend))
193 /* check for internal conflicts */
194 for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IO, i)); i++) {
195 if (tres != res && tres->flags & IORESOURCE_IO) {
196 tport = &tres->start;
198 if (ranged_conflict(port, end, tport, tend))
203 /* check for conflicts with other pnp devices */
204 pnp_for_each_dev(tdev) {
208 (tres = pnp_get_resource(tdev, IORESOURCE_IO, i));
210 if (tres->flags & IORESOURCE_IO) {
211 if (cannot_compare(tres->flags))
213 tport = &tres->start;
215 if (ranged_conflict(port, end, tport, tend))
224 int pnp_check_mem(struct pnp_dev *dev, struct resource *res)
227 struct pnp_dev *tdev;
228 struct resource *tres;
229 resource_size_t *addr, *end, *taddr, *tend;
234 /* if the resource doesn't exist, don't complain about it */
235 if (cannot_compare(res->flags))
238 /* check if the resource is already in use, skip if the
239 * device is active because it itself may be in use */
241 if (check_mem_region(*addr, length(addr, end)))
245 /* check if the resource is reserved */
246 for (i = 0; i < 8; i++) {
247 int raddr = pnp_reserve_mem[i << 1];
248 int rend = pnp_reserve_mem[(i << 1) + 1] + raddr - 1;
249 if (ranged_conflict(addr, end, &raddr, &rend))
253 /* check for internal conflicts */
254 for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_MEM, i)); i++) {
255 if (tres != res && tres->flags & IORESOURCE_MEM) {
256 taddr = &tres->start;
258 if (ranged_conflict(addr, end, taddr, tend))
263 /* check for conflicts with other pnp devices */
264 pnp_for_each_dev(tdev) {
268 (tres = pnp_get_resource(tdev, IORESOURCE_MEM, i));
270 if (tres->flags & IORESOURCE_MEM) {
271 if (cannot_compare(tres->flags))
273 taddr = &tres->start;
275 if (ranged_conflict(addr, end, taddr, tend))
284 static irqreturn_t pnp_test_handler(int irq, void *dev_id)
289 int pnp_check_irq(struct pnp_dev *dev, struct resource *res)
292 struct pnp_dev *tdev;
293 struct resource *tres;
294 resource_size_t *irq;
298 /* if the resource doesn't exist, don't complain about it */
299 if (cannot_compare(res->flags))
302 /* check if the resource is valid */
303 if (*irq < 0 || *irq > 15)
306 /* check if the resource is reserved */
307 for (i = 0; i < 16; i++) {
308 if (pnp_reserve_irq[i] == *irq)
312 /* check for internal conflicts */
313 for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IRQ, i)); i++) {
314 if (tres != res && tres->flags & IORESOURCE_IRQ) {
315 if (tres->start == *irq)
321 /* check if the resource is being used by a pci device */
323 struct pci_dev *pci = NULL;
324 for_each_pci_dev(pci) {
325 if (pci->irq == *irq) {
333 /* check if the resource is already in use, skip if the
334 * device is active because it itself may be in use */
336 if (request_irq(*irq, pnp_test_handler,
337 IRQF_DISABLED | IRQF_PROBE_SHARED, "pnp", NULL))
339 free_irq(*irq, NULL);
342 /* check for conflicts with other pnp devices */
343 pnp_for_each_dev(tdev) {
347 (tres = pnp_get_resource(tdev, IORESOURCE_IRQ, i));
349 if (tres->flags & IORESOURCE_IRQ) {
350 if (cannot_compare(tres->flags))
352 if (tres->start == *irq)
361 int pnp_check_dma(struct pnp_dev *dev, struct resource *res)
365 struct pnp_dev *tdev;
366 struct resource *tres;
367 resource_size_t *dma;
371 /* if the resource doesn't exist, don't complain about it */
372 if (cannot_compare(res->flags))
375 /* check if the resource is valid */
376 if (*dma < 0 || *dma == 4 || *dma > 7)
379 /* check if the resource is reserved */
380 for (i = 0; i < 8; i++) {
381 if (pnp_reserve_dma[i] == *dma)
385 /* check for internal conflicts */
386 for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_DMA, i)); i++) {
387 if (tres != res && tres->flags & IORESOURCE_DMA) {
388 if (tres->start == *dma)
393 /* check if the resource is already in use, skip if the
394 * device is active because it itself may be in use */
396 if (request_dma(*dma, "pnp"))
401 /* check for conflicts with other pnp devices */
402 pnp_for_each_dev(tdev) {
406 (tres = pnp_get_resource(tdev, IORESOURCE_DMA, i));
408 if (tres->flags & IORESOURCE_DMA) {
409 if (cannot_compare(tres->flags))
411 if (tres->start == *dma)
419 /* IA64 does not have legacy DMA */
424 int pnp_resource_type(struct resource *res)
426 return res->flags & (IORESOURCE_IO | IORESOURCE_MEM |
427 IORESOURCE_IRQ | IORESOURCE_DMA);
430 struct resource *pnp_get_resource(struct pnp_dev *dev,
431 unsigned int type, unsigned int num)
433 struct pnp_resource *pnp_res;
434 struct resource *res;
436 list_for_each_entry(pnp_res, &dev->resources, list) {
438 if (pnp_resource_type(res) == type && num-- == 0)
443 EXPORT_SYMBOL(pnp_get_resource);
445 static struct pnp_resource *pnp_new_resource(struct pnp_dev *dev)
447 struct pnp_resource *pnp_res;
449 pnp_res = kzalloc(sizeof(struct pnp_resource), GFP_KERNEL);
453 list_add_tail(&pnp_res->list, &dev->resources);
457 struct pnp_resource *pnp_add_irq_resource(struct pnp_dev *dev, int irq,
460 struct pnp_resource *pnp_res;
461 struct resource *res;
463 pnp_res = pnp_new_resource(dev);
465 dev_err(&dev->dev, "can't add resource for IRQ %d\n", irq);
470 res->flags = IORESOURCE_IRQ | flags;
474 dev_dbg(&dev->dev, " add irq %d flags %#x\n", irq, flags);
478 struct pnp_resource *pnp_add_dma_resource(struct pnp_dev *dev, int dma,
481 struct pnp_resource *pnp_res;
482 struct resource *res;
484 pnp_res = pnp_new_resource(dev);
486 dev_err(&dev->dev, "can't add resource for DMA %d\n", dma);
491 res->flags = IORESOURCE_DMA | flags;
495 dev_dbg(&dev->dev, " add dma %d flags %#x\n", dma, flags);
499 struct pnp_resource *pnp_add_io_resource(struct pnp_dev *dev,
500 resource_size_t start,
501 resource_size_t end, int flags)
503 struct pnp_resource *pnp_res;
504 struct resource *res;
506 pnp_res = pnp_new_resource(dev);
508 dev_err(&dev->dev, "can't add resource for IO %#llx-%#llx\n",
509 (unsigned long long) start,
510 (unsigned long long) end);
515 res->flags = IORESOURCE_IO | flags;
519 dev_dbg(&dev->dev, " add io %#llx-%#llx flags %#x\n",
520 (unsigned long long) start, (unsigned long long) end, flags);
524 struct pnp_resource *pnp_add_mem_resource(struct pnp_dev *dev,
525 resource_size_t start,
526 resource_size_t end, int flags)
528 struct pnp_resource *pnp_res;
529 struct resource *res;
531 pnp_res = pnp_new_resource(dev);
533 dev_err(&dev->dev, "can't add resource for MEM %#llx-%#llx\n",
534 (unsigned long long) start,
535 (unsigned long long) end);
540 res->flags = IORESOURCE_MEM | flags;
544 dev_dbg(&dev->dev, " add mem %#llx-%#llx flags %#x\n",
545 (unsigned long long) start, (unsigned long long) end, flags);
550 * Determine whether the specified resource is a possible configuration
553 int pnp_possible_config(struct pnp_dev *dev, int type, resource_size_t start,
554 resource_size_t size)
556 struct pnp_option *option;
557 struct pnp_port *port;
562 list_for_each_entry(option, &dev->options, list) {
563 if (option->type != type)
566 switch (option->type) {
568 port = &option->u.port;
569 if (port->min == start && port->size == size)
573 mem = &option->u.mem;
574 if (mem->min == start && mem->size == size)
578 irq = &option->u.irq;
579 if (start < PNP_IRQ_NR &&
580 test_bit(start, irq->map.bits))
584 dma = &option->u.dma;
585 if (dma->map & (1 << start))
593 EXPORT_SYMBOL(pnp_possible_config);
595 /* format is: pnp_reserve_irq=irq1[,irq2] .... */
596 static int __init pnp_setup_reserve_irq(char *str)
600 for (i = 0; i < 16; i++)
601 if (get_option(&str, &pnp_reserve_irq[i]) != 2)
606 __setup("pnp_reserve_irq=", pnp_setup_reserve_irq);
608 /* format is: pnp_reserve_dma=dma1[,dma2] .... */
609 static int __init pnp_setup_reserve_dma(char *str)
613 for (i = 0; i < 8; i++)
614 if (get_option(&str, &pnp_reserve_dma[i]) != 2)
619 __setup("pnp_reserve_dma=", pnp_setup_reserve_dma);
621 /* format is: pnp_reserve_io=io1,size1[,io2,size2] .... */
622 static int __init pnp_setup_reserve_io(char *str)
626 for (i = 0; i < 16; i++)
627 if (get_option(&str, &pnp_reserve_io[i]) != 2)
632 __setup("pnp_reserve_io=", pnp_setup_reserve_io);
634 /* format is: pnp_reserve_mem=mem1,size1[,mem2,size2] .... */
635 static int __init pnp_setup_reserve_mem(char *str)
639 for (i = 0; i < 16; i++)
640 if (get_option(&str, &pnp_reserve_mem[i]) != 2)
645 __setup("pnp_reserve_mem=", pnp_setup_reserve_mem);