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, int idx)
245 struct pnp_dev *tdev;
246 resource_size_t *port, *end, *tport, *tend;
248 port = &dev->res.port_resource[idx].start;
249 end = &dev->res.port_resource[idx].end;
251 /* if the resource doesn't exist, don't complain about it */
252 if (cannot_compare(dev->res.port_resource[idx].flags))
255 /* check if the resource is already in use, skip if the
256 * device is active because it itself may be in use */
258 if (__check_region(&ioport_resource, *port, length(port, end)))
262 /* check if the resource is reserved */
263 for (i = 0; i < 8; i++) {
264 int rport = pnp_reserve_io[i << 1];
265 int rend = pnp_reserve_io[(i << 1) + 1] + rport - 1;
266 if (ranged_conflict(port, end, &rport, &rend))
270 /* check for internal conflicts */
271 for (i = 0; i < PNP_MAX_PORT && i != idx; i++) {
272 if (dev->res.port_resource[i].flags & IORESOURCE_IO) {
273 tport = &dev->res.port_resource[i].start;
274 tend = &dev->res.port_resource[i].end;
275 if (ranged_conflict(port, end, tport, tend))
280 /* check for conflicts with other pnp devices */
281 pnp_for_each_dev(tdev) {
284 for (i = 0; i < PNP_MAX_PORT; i++) {
285 if (tdev->res.port_resource[i].flags & IORESOURCE_IO) {
287 (tdev->res.port_resource[i].flags))
289 tport = &tdev->res.port_resource[i].start;
290 tend = &tdev->res.port_resource[i].end;
291 if (ranged_conflict(port, end, tport, tend))
300 int pnp_check_mem(struct pnp_dev *dev, int idx)
303 struct pnp_dev *tdev;
304 resource_size_t *addr, *end, *taddr, *tend;
306 addr = &dev->res.mem_resource[idx].start;
307 end = &dev->res.mem_resource[idx].end;
309 /* if the resource doesn't exist, don't complain about it */
310 if (cannot_compare(dev->res.mem_resource[idx].flags))
313 /* check if the resource is already in use, skip if the
314 * device is active because it itself may be in use */
316 if (check_mem_region(*addr, length(addr, end)))
320 /* check if the resource is reserved */
321 for (i = 0; i < 8; i++) {
322 int raddr = pnp_reserve_mem[i << 1];
323 int rend = pnp_reserve_mem[(i << 1) + 1] + raddr - 1;
324 if (ranged_conflict(addr, end, &raddr, &rend))
328 /* check for internal conflicts */
329 for (i = 0; i < PNP_MAX_MEM && i != idx; i++) {
330 if (dev->res.mem_resource[i].flags & IORESOURCE_MEM) {
331 taddr = &dev->res.mem_resource[i].start;
332 tend = &dev->res.mem_resource[i].end;
333 if (ranged_conflict(addr, end, taddr, tend))
338 /* check for conflicts with other pnp devices */
339 pnp_for_each_dev(tdev) {
342 for (i = 0; i < PNP_MAX_MEM; i++) {
343 if (tdev->res.mem_resource[i].flags & IORESOURCE_MEM) {
345 (tdev->res.mem_resource[i].flags))
347 taddr = &tdev->res.mem_resource[i].start;
348 tend = &tdev->res.mem_resource[i].end;
349 if (ranged_conflict(addr, end, taddr, tend))
358 static irqreturn_t pnp_test_handler(int irq, void *dev_id)
363 int pnp_check_irq(struct pnp_dev *dev, int idx)
366 struct pnp_dev *tdev;
367 resource_size_t *irq = &dev->res.irq_resource[idx].start;
369 /* if the resource doesn't exist, don't complain about it */
370 if (cannot_compare(dev->res.irq_resource[idx].flags))
373 /* check if the resource is valid */
374 if (*irq < 0 || *irq > 15)
377 /* check if the resource is reserved */
378 for (i = 0; i < 16; i++) {
379 if (pnp_reserve_irq[i] == *irq)
383 /* check for internal conflicts */
384 for (i = 0; i < PNP_MAX_IRQ && i != idx; i++) {
385 if (dev->res.irq_resource[i].flags & IORESOURCE_IRQ) {
386 if (dev->res.irq_resource[i].start == *irq)
392 /* check if the resource is being used by a pci device */
394 struct pci_dev *pci = NULL;
395 for_each_pci_dev(pci) {
396 if (pci->irq == *irq) {
404 /* check if the resource is already in use, skip if the
405 * device is active because it itself may be in use */
407 if (request_irq(*irq, pnp_test_handler,
408 IRQF_DISABLED | IRQF_PROBE_SHARED, "pnp", NULL))
410 free_irq(*irq, NULL);
413 /* check for conflicts with other pnp devices */
414 pnp_for_each_dev(tdev) {
417 for (i = 0; i < PNP_MAX_IRQ; i++) {
418 if (tdev->res.irq_resource[i].flags & IORESOURCE_IRQ) {
420 (tdev->res.irq_resource[i].flags))
422 if ((tdev->res.irq_resource[i].start == *irq))
431 int pnp_check_dma(struct pnp_dev *dev, int idx)
435 struct pnp_dev *tdev;
436 resource_size_t *dma = &dev->res.dma_resource[idx].start;
438 /* if the resource doesn't exist, don't complain about it */
439 if (cannot_compare(dev->res.dma_resource[idx].flags))
442 /* check if the resource is valid */
443 if (*dma < 0 || *dma == 4 || *dma > 7)
446 /* check if the resource is reserved */
447 for (i = 0; i < 8; i++) {
448 if (pnp_reserve_dma[i] == *dma)
452 /* check for internal conflicts */
453 for (i = 0; i < PNP_MAX_DMA && i != idx; i++) {
454 if (dev->res.dma_resource[i].flags & IORESOURCE_DMA) {
455 if (dev->res.dma_resource[i].start == *dma)
460 /* check if the resource is already in use, skip if the
461 * device is active because it itself may be in use */
463 if (request_dma(*dma, "pnp"))
468 /* check for conflicts with other pnp devices */
469 pnp_for_each_dev(tdev) {
472 for (i = 0; i < PNP_MAX_DMA; i++) {
473 if (tdev->res.dma_resource[i].flags & IORESOURCE_DMA) {
475 (tdev->res.dma_resource[i].flags))
477 if ((tdev->res.dma_resource[i].start == *dma))
485 /* IA64 does not have legacy DMA */
490 struct resource *pnp_get_resource(struct pnp_dev *dev,
491 unsigned int type, unsigned int num)
493 struct pnp_resource_table *res = &dev->res;
497 if (num >= PNP_MAX_PORT)
499 return &res->port_resource[num];
501 if (num >= PNP_MAX_MEM)
503 return &res->mem_resource[num];
505 if (num >= PNP_MAX_IRQ)
507 return &res->irq_resource[num];
509 if (num >= PNP_MAX_DMA)
511 return &res->dma_resource[num];
515 EXPORT_SYMBOL(pnp_get_resource);
517 /* format is: pnp_reserve_irq=irq1[,irq2] .... */
518 static int __init pnp_setup_reserve_irq(char *str)
522 for (i = 0; i < 16; i++)
523 if (get_option(&str, &pnp_reserve_irq[i]) != 2)
528 __setup("pnp_reserve_irq=", pnp_setup_reserve_irq);
530 /* format is: pnp_reserve_dma=dma1[,dma2] .... */
531 static int __init pnp_setup_reserve_dma(char *str)
535 for (i = 0; i < 8; i++)
536 if (get_option(&str, &pnp_reserve_dma[i]) != 2)
541 __setup("pnp_reserve_dma=", pnp_setup_reserve_dma);
543 /* format is: pnp_reserve_io=io1,size1[,io2,size2] .... */
544 static int __init pnp_setup_reserve_io(char *str)
548 for (i = 0; i < 16; i++)
549 if (get_option(&str, &pnp_reserve_io[i]) != 2)
554 __setup("pnp_reserve_io=", pnp_setup_reserve_io);
556 /* format is: pnp_reserve_mem=mem1,size1[,mem2,size2] .... */
557 static int __init pnp_setup_reserve_mem(char *str)
561 for (i = 0; i < 16; i++)
562 if (get_option(&str, &pnp_reserve_mem[i]) != 2)
567 __setup("pnp_reserve_mem=", pnp_setup_reserve_mem);