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 static 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))
102 pcibios_penalize_isa_irq(i, 0);
107 bitmap_scnprintf(buf, sizeof(buf), data->map, 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 %#x max %#x align %d size %d flags %#x\n",
147 data->min, data->max, data->align, data->size, data->flags);
151 int pnp_register_mem_resource(struct pnp_dev *dev, struct pnp_option *option,
152 struct pnp_mem *data)
157 while (ptr && ptr->next)
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);
170 static void pnp_free_port(struct pnp_port *port)
172 struct pnp_port *next;
181 static void pnp_free_irq(struct pnp_irq *irq)
183 struct pnp_irq *next;
192 static void pnp_free_dma(struct pnp_dma *dma)
194 struct pnp_dma *next;
203 static void pnp_free_mem(struct pnp_mem *mem)
205 struct pnp_mem *next;
214 void pnp_free_option(struct pnp_option *option)
216 struct pnp_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);
230 * resource validity checking
233 #define length(start, end) (*(end) - *(start) + 1)
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)))
239 #define cannot_compare(flags) \
240 ((flags) & (IORESOURCE_UNSET | IORESOURCE_DISABLED))
242 int pnp_check_port(struct pnp_dev *dev, struct resource *res)
245 struct pnp_dev *tdev;
246 struct resource *tres;
247 resource_size_t *port, *end, *tport, *tend;
252 /* if the resource doesn't exist, don't complain about it */
253 if (cannot_compare(res->flags))
256 /* check if the resource is already in use, skip if the
257 * device is active because it itself may be in use */
259 if (__check_region(&ioport_resource, *port, length(port, end)))
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))
271 /* check for internal conflicts */
272 for (i = 0; i < PNP_MAX_PORT; i++) {
273 tres = &dev->res.port_resource[i];
274 if (tres != res && tres->flags & IORESOURCE_IO) {
275 tport = &tres->start;
277 if (ranged_conflict(port, end, tport, tend))
282 /* check for conflicts with other pnp devices */
283 pnp_for_each_dev(tdev) {
286 for (i = 0; i < PNP_MAX_PORT; i++) {
287 tres = &tdev->res.port_resource[i];
288 if (tres->flags & IORESOURCE_IO) {
289 if (cannot_compare(tres->flags))
291 tport = &tres->start;
293 if (ranged_conflict(port, end, tport, tend))
302 int pnp_check_mem(struct pnp_dev *dev, struct resource *res)
305 struct pnp_dev *tdev;
306 struct resource *tres;
307 resource_size_t *addr, *end, *taddr, *tend;
312 /* if the resource doesn't exist, don't complain about it */
313 if (cannot_compare(res->flags))
316 /* check if the resource is already in use, skip if the
317 * device is active because it itself may be in use */
319 if (check_mem_region(*addr, length(addr, end)))
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))
331 /* check for internal conflicts */
332 for (i = 0; i < PNP_MAX_MEM; i++) {
333 tres = &dev->res.mem_resource[i];
334 if (tres != res && tres->flags & IORESOURCE_MEM) {
335 taddr = &tres->start;
337 if (ranged_conflict(addr, end, taddr, tend))
342 /* check for conflicts with other pnp devices */
343 pnp_for_each_dev(tdev) {
346 for (i = 0; i < PNP_MAX_MEM; i++) {
347 tres = &tdev->res.mem_resource[i];
348 if (tres->flags & IORESOURCE_MEM) {
349 if (cannot_compare(tres->flags))
351 taddr = &tres->start;
353 if (ranged_conflict(addr, end, taddr, tend))
362 static irqreturn_t pnp_test_handler(int irq, void *dev_id)
367 int pnp_check_irq(struct pnp_dev *dev, struct resource *res)
370 struct pnp_dev *tdev;
371 struct resource *tres;
372 resource_size_t *irq;
376 /* if the resource doesn't exist, don't complain about it */
377 if (cannot_compare(res->flags))
380 /* check if the resource is valid */
381 if (*irq < 0 || *irq > 15)
384 /* check if the resource is reserved */
385 for (i = 0; i < 16; i++) {
386 if (pnp_reserve_irq[i] == *irq)
390 /* check for internal conflicts */
391 for (i = 0; i < PNP_MAX_IRQ; i++) {
392 tres = &dev->res.irq_resource[i];
393 if (tres != res && tres->flags & IORESOURCE_IRQ) {
394 if (tres->start == *irq)
400 /* check if the resource is being used by a pci device */
402 struct pci_dev *pci = NULL;
403 for_each_pci_dev(pci) {
404 if (pci->irq == *irq) {
412 /* check if the resource is already in use, skip if the
413 * device is active because it itself may be in use */
415 if (request_irq(*irq, pnp_test_handler,
416 IRQF_DISABLED | IRQF_PROBE_SHARED, "pnp", NULL))
418 free_irq(*irq, NULL);
421 /* check for conflicts with other pnp devices */
422 pnp_for_each_dev(tdev) {
425 for (i = 0; i < PNP_MAX_IRQ; i++) {
426 tres = &tdev->res.irq_resource[i];
427 if (tres->flags & IORESOURCE_IRQ) {
428 if (cannot_compare(tres->flags))
430 if (tres->start == *irq)
439 int pnp_check_dma(struct pnp_dev *dev, struct resource *res)
443 struct pnp_dev *tdev;
444 struct resource *tres;
445 resource_size_t *dma;
449 /* if the resource doesn't exist, don't complain about it */
450 if (cannot_compare(res->flags))
453 /* check if the resource is valid */
454 if (*dma < 0 || *dma == 4 || *dma > 7)
457 /* check if the resource is reserved */
458 for (i = 0; i < 8; i++) {
459 if (pnp_reserve_dma[i] == *dma)
463 /* check for internal conflicts */
464 for (i = 0; i < PNP_MAX_DMA; i++) {
465 tres = &dev->res.dma_resource[i];
466 if (tres != res && tres->flags & IORESOURCE_DMA) {
467 if (tres->start == *dma)
472 /* check if the resource is already in use, skip if the
473 * device is active because it itself may be in use */
475 if (request_dma(*dma, "pnp"))
480 /* check for conflicts with other pnp devices */
481 pnp_for_each_dev(tdev) {
484 for (i = 0; i < PNP_MAX_DMA; i++) {
485 tres = &tdev->res.dma_resource[i];
486 if (tres->flags & IORESOURCE_DMA) {
487 if (cannot_compare(tres->flags))
489 if (tres->start == *dma)
497 /* IA64 does not have legacy DMA */
502 struct resource *pnp_get_resource(struct pnp_dev *dev,
503 unsigned int type, unsigned int num)
505 struct pnp_resource_table *res = &dev->res;
509 if (num >= PNP_MAX_PORT)
511 return &res->port_resource[num];
513 if (num >= PNP_MAX_MEM)
515 return &res->mem_resource[num];
517 if (num >= PNP_MAX_IRQ)
519 return &res->irq_resource[num];
521 if (num >= PNP_MAX_DMA)
523 return &res->dma_resource[num];
527 EXPORT_SYMBOL(pnp_get_resource);
529 /* format is: pnp_reserve_irq=irq1[,irq2] .... */
530 static int __init pnp_setup_reserve_irq(char *str)
534 for (i = 0; i < 16; i++)
535 if (get_option(&str, &pnp_reserve_irq[i]) != 2)
540 __setup("pnp_reserve_irq=", pnp_setup_reserve_irq);
542 /* format is: pnp_reserve_dma=dma1[,dma2] .... */
543 static int __init pnp_setup_reserve_dma(char *str)
547 for (i = 0; i < 8; i++)
548 if (get_option(&str, &pnp_reserve_dma[i]) != 2)
553 __setup("pnp_reserve_dma=", pnp_setup_reserve_dma);
555 /* format is: pnp_reserve_io=io1,size1[,io2,size2] .... */
556 static int __init pnp_setup_reserve_io(char *str)
560 for (i = 0; i < 16; i++)
561 if (get_option(&str, &pnp_reserve_io[i]) != 2)
566 __setup("pnp_reserve_io=", pnp_setup_reserve_io);
568 /* format is: pnp_reserve_mem=mem1,size1[,mem2,size2] .... */
569 static int __init pnp_setup_reserve_mem(char *str)
573 for (i = 0; i < 16; i++)
574 if (get_option(&str, &pnp_reserve_mem[i]) != 2)
579 __setup("pnp_reserve_mem=", pnp_setup_reserve_mem);