[ACPI] PNPACPI vs sound IRQ
[linux-3.10.git] / drivers / pnp / resource.c
1 /*
2  * resource.c - Contains functions for registering and analyzing resource information
3  *
4  * based on isapnp.c resource management (c) Jaroslav Kysela <perex@suse.cz>
5  * Copyright 2003 Adam Belay <ambx1@neo.rr.com>
6  *
7  */
8
9 #include <linux/config.h>
10 #include <linux/module.h>
11 #include <linux/errno.h>
12 #include <linux/interrupt.h>
13 #include <linux/kernel.h>
14 #include <asm/io.h>
15 #include <asm/dma.h>
16 #include <asm/irq.h>
17 #include <linux/pci.h>
18 #include <linux/ioport.h>
19 #include <linux/init.h>
20
21 #include <linux/pnp.h>
22 #include "base.h"
23
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 */
28
29
30 /*
31  * option registration
32  */
33
34 static struct pnp_option * pnp_build_option(int priority)
35 {
36         struct pnp_option *option = pnp_alloc(sizeof(struct pnp_option));
37
38         /* check if pnp_alloc ran out of memory */
39         if (!option)
40                 return NULL;
41
42         option->priority = priority & 0xff;
43         /* make sure the priority is valid */
44         if (option->priority > PNP_RES_PRIORITY_FUNCTIONAL)
45                 option->priority = PNP_RES_PRIORITY_INVALID;
46
47         return option;
48 }
49
50 struct pnp_option * pnp_register_independent_option(struct pnp_dev *dev)
51 {
52         struct pnp_option *option;
53         if (!dev)
54                 return NULL;
55
56         option = pnp_build_option(PNP_RES_PRIORITY_PREFERRED);
57
58         /* this should never happen but if it does we'll try to continue */
59         if (dev->independent)
60                 pnp_err("independent resource already registered");
61         dev->independent = option;
62         return option;
63 }
64
65 struct pnp_option * pnp_register_dependent_option(struct pnp_dev *dev, int priority)
66 {
67         struct pnp_option *option;
68         if (!dev)
69                 return NULL;
70
71         option = pnp_build_option(priority);
72
73         if (dev->dependent) {
74                 struct pnp_option *parent = dev->dependent;
75                 while (parent->next)
76                         parent = parent->next;
77                 parent->next = option;
78         } else
79                 dev->dependent = option;
80         return option;
81 }
82
83 int pnp_register_irq_resource(struct pnp_option *option, struct pnp_irq *data)
84 {
85         struct pnp_irq *ptr;
86         if (!option)
87                 return -EINVAL;
88         if (!data)
89                 return -EINVAL;
90
91         ptr = option->irq;
92         while (ptr && ptr->next)
93                 ptr = ptr->next;
94         if (ptr)
95                 ptr->next = data;
96         else
97                 option->irq = data;
98
99 #ifdef CONFIG_PCI
100         {
101                 int i;
102
103                 for (i = 0; i < 16; i++)
104                         if (test_bit(i, data->map))
105                                 pcibios_penalize_isa_irq(i, 0);
106         }
107 #endif
108         return 0;
109 }
110
111 int pnp_register_dma_resource(struct pnp_option *option, struct pnp_dma *data)
112 {
113         struct pnp_dma *ptr;
114         if (!option)
115                 return -EINVAL;
116         if (!data)
117                 return -EINVAL;
118
119         ptr = option->dma;
120         while (ptr && ptr->next)
121                 ptr = ptr->next;
122         if (ptr)
123                 ptr->next = data;
124         else
125                 option->dma = data;
126
127         return 0;
128 }
129
130 int pnp_register_port_resource(struct pnp_option *option, struct pnp_port *data)
131 {
132         struct pnp_port *ptr;
133         if (!option)
134                 return -EINVAL;
135         if (!data)
136                 return -EINVAL;
137
138         ptr = option->port;
139         while (ptr && ptr->next)
140                 ptr = ptr->next;
141         if (ptr)
142                 ptr->next = data;
143         else
144                 option->port = data;
145
146         return 0;
147 }
148
149 int pnp_register_mem_resource(struct pnp_option *option, struct pnp_mem *data)
150 {
151         struct pnp_mem *ptr;
152         if (!option)
153                 return -EINVAL;
154         if (!data)
155                 return -EINVAL;
156
157         ptr = option->mem;
158         while (ptr && ptr->next)
159                 ptr = ptr->next;
160         if (ptr)
161                 ptr->next = data;
162         else
163                 option->mem = data;
164         return 0;
165 }
166
167 static void pnp_free_port(struct pnp_port *port)
168 {
169         struct pnp_port *next;
170
171         while (port) {
172                 next = port->next;
173                 kfree(port);
174                 port = next;
175         }
176 }
177
178 static void pnp_free_irq(struct pnp_irq *irq)
179 {
180         struct pnp_irq *next;
181
182         while (irq) {
183                 next = irq->next;
184                 kfree(irq);
185                 irq = next;
186         }
187 }
188
189 static void pnp_free_dma(struct pnp_dma *dma)
190 {
191         struct pnp_dma *next;
192
193         while (dma) {
194                 next = dma->next;
195                 kfree(dma);
196                 dma = next;
197         }
198 }
199
200 static void pnp_free_mem(struct pnp_mem *mem)
201 {
202         struct pnp_mem *next;
203
204         while (mem) {
205                 next = mem->next;
206                 kfree(mem);
207                 mem = next;
208         }
209 }
210
211 void pnp_free_option(struct pnp_option *option)
212 {
213         struct pnp_option *next;
214
215         while (option) {
216                 next = option->next;
217                 pnp_free_port(option->port);
218                 pnp_free_irq(option->irq);
219                 pnp_free_dma(option->dma);
220                 pnp_free_mem(option->mem);
221                 kfree(option);
222                 option = next;
223         }
224 }
225
226
227 /*
228  * resource validity checking
229  */
230
231 #define length(start, end) (*(end) - *(start) + 1)
232
233 /* Two ranges conflict if one doesn't end before the other starts */
234 #define ranged_conflict(starta, enda, startb, endb) \
235         !((*(enda) < *(startb)) || (*(endb) < *(starta)))
236
237 #define cannot_compare(flags) \
238 ((flags) & (IORESOURCE_UNSET | IORESOURCE_DISABLED))
239
240 int pnp_check_port(struct pnp_dev * dev, int idx)
241 {
242         int tmp;
243         struct pnp_dev *tdev;
244         unsigned long *port, *end, *tport, *tend;
245         port = &dev->res.port_resource[idx].start;
246         end = &dev->res.port_resource[idx].end;
247
248         /* if the resource doesn't exist, don't complain about it */
249         if (cannot_compare(dev->res.port_resource[idx].flags))
250                 return 1;
251
252         /* check if the resource is already in use, skip if the
253          * device is active because it itself may be in use */
254         if(!dev->active) {
255                 if (__check_region(&ioport_resource, *port, length(port,end)))
256                         return 0;
257         }
258
259         /* check if the resource is reserved */
260         for (tmp = 0; tmp < 8; tmp++) {
261                 int rport = pnp_reserve_io[tmp << 1];
262                 int rend = pnp_reserve_io[(tmp << 1) + 1] + rport - 1;
263                 if (ranged_conflict(port,end,&rport,&rend))
264                         return 0;
265         }
266
267         /* check for internal conflicts */
268         for (tmp = 0; tmp < PNP_MAX_PORT && tmp != idx; tmp++) {
269                 if (dev->res.port_resource[tmp].flags & IORESOURCE_IO) {
270                         tport = &dev->res.port_resource[tmp].start;
271                         tend = &dev->res.port_resource[tmp].end;
272                         if (ranged_conflict(port,end,tport,tend))
273                                 return 0;
274                 }
275         }
276
277         /* check for conflicts with other pnp devices */
278         pnp_for_each_dev(tdev) {
279                 if (tdev == dev)
280                         continue;
281                 for (tmp = 0; tmp < PNP_MAX_PORT; tmp++) {
282                         if (tdev->res.port_resource[tmp].flags & IORESOURCE_IO) {
283                                 if (cannot_compare(tdev->res.port_resource[tmp].flags))
284                                         continue;
285                                 tport = &tdev->res.port_resource[tmp].start;
286                                 tend = &tdev->res.port_resource[tmp].end;
287                                 if (ranged_conflict(port,end,tport,tend))
288                                         return 0;
289                         }
290                 }
291         }
292
293         return 1;
294 }
295
296 int pnp_check_mem(struct pnp_dev * dev, int idx)
297 {
298         int tmp;
299         struct pnp_dev *tdev;
300         unsigned long *addr, *end, *taddr, *tend;
301         addr = &dev->res.mem_resource[idx].start;
302         end = &dev->res.mem_resource[idx].end;
303
304         /* if the resource doesn't exist, don't complain about it */
305         if (cannot_compare(dev->res.mem_resource[idx].flags))
306                 return 1;
307
308         /* check if the resource is already in use, skip if the
309          * device is active because it itself may be in use */
310         if(!dev->active) {
311                 if (check_mem_region(*addr, length(addr,end)))
312                         return 0;
313         }
314
315         /* check if the resource is reserved */
316         for (tmp = 0; tmp < 8; tmp++) {
317                 int raddr = pnp_reserve_mem[tmp << 1];
318                 int rend = pnp_reserve_mem[(tmp << 1) + 1] + raddr - 1;
319                 if (ranged_conflict(addr,end,&raddr,&rend))
320                         return 0;
321         }
322
323         /* check for internal conflicts */
324         for (tmp = 0; tmp < PNP_MAX_MEM && tmp != idx; tmp++) {
325                 if (dev->res.mem_resource[tmp].flags & IORESOURCE_MEM) {
326                         taddr = &dev->res.mem_resource[tmp].start;
327                         tend = &dev->res.mem_resource[tmp].end;
328                         if (ranged_conflict(addr,end,taddr,tend))
329                                 return 0;
330                 }
331         }
332
333         /* check for conflicts with other pnp devices */
334         pnp_for_each_dev(tdev) {
335                 if (tdev == dev)
336                         continue;
337                 for (tmp = 0; tmp < PNP_MAX_MEM; tmp++) {
338                         if (tdev->res.mem_resource[tmp].flags & IORESOURCE_MEM) {
339                                 if (cannot_compare(tdev->res.mem_resource[tmp].flags))
340                                         continue;
341                                 taddr = &tdev->res.mem_resource[tmp].start;
342                                 tend = &tdev->res.mem_resource[tmp].end;
343                                 if (ranged_conflict(addr,end,taddr,tend))
344                                         return 0;
345                         }
346                 }
347         }
348
349         return 1;
350 }
351
352 static irqreturn_t pnp_test_handler(int irq, void *dev_id, struct pt_regs *regs)
353 {
354         return IRQ_HANDLED;
355 }
356
357 int pnp_check_irq(struct pnp_dev * dev, int idx)
358 {
359         int tmp;
360         struct pnp_dev *tdev;
361         unsigned long * irq = &dev->res.irq_resource[idx].start;
362
363         /* if the resource doesn't exist, don't complain about it */
364         if (cannot_compare(dev->res.irq_resource[idx].flags))
365                 return 1;
366
367         /* check if the resource is valid */
368         if (*irq < 0 || *irq > 15)
369                 return 0;
370
371         /* check if the resource is reserved */
372         for (tmp = 0; tmp < 16; tmp++) {
373                 if (pnp_reserve_irq[tmp] == *irq)
374                         return 0;
375         }
376
377         /* check for internal conflicts */
378         for (tmp = 0; tmp < PNP_MAX_IRQ && tmp != idx; tmp++) {
379                 if (dev->res.irq_resource[tmp].flags & IORESOURCE_IRQ) {
380                         if (dev->res.irq_resource[tmp].start == *irq)
381                                 return 0;
382                 }
383         }
384
385 #ifdef CONFIG_PCI
386         /* check if the resource is being used by a pci device */
387         {
388                 struct pci_dev *pci = NULL;
389                 for_each_pci_dev(pci) {
390                         if (pci->irq == *irq)
391                                 return 0;
392                 }
393         }
394 #endif
395
396         /* check if the resource is already in use, skip if the
397          * device is active because it itself may be in use */
398         if(!dev->active) {
399                 if (request_irq(*irq, pnp_test_handler, SA_INTERRUPT, "pnp", NULL))
400                         return 0;
401                 free_irq(*irq, NULL);
402         }
403
404         /* check for conflicts with other pnp devices */
405         pnp_for_each_dev(tdev) {
406                 if (tdev == dev)
407                         continue;
408                 for (tmp = 0; tmp < PNP_MAX_IRQ; tmp++) {
409                         if (tdev->res.irq_resource[tmp].flags & IORESOURCE_IRQ) {
410                                 if (cannot_compare(tdev->res.irq_resource[tmp].flags))
411                                         continue;
412                                 if ((tdev->res.irq_resource[tmp].start == *irq))
413                                         return 0;
414                         }
415                 }
416         }
417
418         return 1;
419 }
420
421 int pnp_check_dma(struct pnp_dev * dev, int idx)
422 {
423 #ifndef CONFIG_IA64
424         int tmp;
425         struct pnp_dev *tdev;
426         unsigned long * dma = &dev->res.dma_resource[idx].start;
427
428         /* if the resource doesn't exist, don't complain about it */
429         if (cannot_compare(dev->res.dma_resource[idx].flags))
430                 return 1;
431
432         /* check if the resource is valid */
433         if (*dma < 0 || *dma == 4 || *dma > 7)
434                 return 0;
435
436         /* check if the resource is reserved */
437         for (tmp = 0; tmp < 8; tmp++) {
438                 if (pnp_reserve_dma[tmp] == *dma)
439                         return 0;
440         }
441
442         /* check for internal conflicts */
443         for (tmp = 0; tmp < PNP_MAX_DMA && tmp != idx; tmp++) {
444                 if (dev->res.dma_resource[tmp].flags & IORESOURCE_DMA) {
445                         if (dev->res.dma_resource[tmp].start == *dma)
446                                 return 0;
447                 }
448         }
449
450         /* check if the resource is already in use, skip if the
451          * device is active because it itself may be in use */
452         if(!dev->active) {
453                 if (request_dma(*dma, "pnp"))
454                         return 0;
455                 free_dma(*dma);
456         }
457
458         /* check for conflicts with other pnp devices */
459         pnp_for_each_dev(tdev) {
460                 if (tdev == dev)
461                         continue;
462                 for (tmp = 0; tmp < PNP_MAX_DMA; tmp++) {
463                         if (tdev->res.dma_resource[tmp].flags & IORESOURCE_DMA) {
464                                 if (cannot_compare(tdev->res.dma_resource[tmp].flags))
465                                         continue;
466                                 if ((tdev->res.dma_resource[tmp].start == *dma))
467                                         return 0;
468                         }
469                 }
470         }
471
472         return 1;
473 #else
474         /* IA64 hasn't legacy DMA */
475         return 0;
476 #endif
477 }
478
479
480 EXPORT_SYMBOL(pnp_register_dependent_option);
481 EXPORT_SYMBOL(pnp_register_independent_option);
482 EXPORT_SYMBOL(pnp_register_irq_resource);
483 EXPORT_SYMBOL(pnp_register_dma_resource);
484 EXPORT_SYMBOL(pnp_register_port_resource);
485 EXPORT_SYMBOL(pnp_register_mem_resource);
486
487
488 /* format is: pnp_reserve_irq=irq1[,irq2] .... */
489
490 static int __init pnp_setup_reserve_irq(char *str)
491 {
492         int i;
493
494         for (i = 0; i < 16; i++)
495                 if (get_option(&str,&pnp_reserve_irq[i]) != 2)
496                         break;
497         return 1;
498 }
499
500 __setup("pnp_reserve_irq=", pnp_setup_reserve_irq);
501
502 /* format is: pnp_reserve_dma=dma1[,dma2] .... */
503
504 static int __init pnp_setup_reserve_dma(char *str)
505 {
506         int i;
507
508         for (i = 0; i < 8; i++)
509                 if (get_option(&str,&pnp_reserve_dma[i]) != 2)
510                         break;
511         return 1;
512 }
513
514 __setup("pnp_reserve_dma=", pnp_setup_reserve_dma);
515
516 /* format is: pnp_reserve_io=io1,size1[,io2,size2] .... */
517
518 static int __init pnp_setup_reserve_io(char *str)
519 {
520         int i;
521
522         for (i = 0; i < 16; i++)
523                 if (get_option(&str,&pnp_reserve_io[i]) != 2)
524                         break;
525         return 1;
526 }
527
528 __setup("pnp_reserve_io=", pnp_setup_reserve_io);
529
530 /* format is: pnp_reserve_mem=mem1,size1[,mem2,size2] .... */
531
532 static int __init pnp_setup_reserve_mem(char *str)
533 {
534         int i;
535
536         for (i = 0; i < 16; i++)
537                 if (get_option(&str,&pnp_reserve_mem[i]) != 2)
538                         break;
539         return 1;
540 }
541
542 __setup("pnp_reserve_mem=", pnp_setup_reserve_mem);