Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/cooloney...
[linux-2.6] / 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 #include <linux/module.h>
9 #include <linux/errno.h>
10 #include <linux/interrupt.h>
11 #include <linux/kernel.h>
12 #include <asm/io.h>
13 #include <asm/dma.h>
14 #include <asm/irq.h>
15 #include <linux/pci.h>
16 #include <linux/ioport.h>
17 #include <linux/init.h>
18
19 #include <linux/pnp.h>
20 #include "base.h"
21
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 */
26
27 /*
28  * option registration
29  */
30
31 static struct pnp_option *pnp_build_option(int priority)
32 {
33         struct pnp_option *option = pnp_alloc(sizeof(struct pnp_option));
34
35         if (!option)
36                 return NULL;
37
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;
42
43         return option;
44 }
45
46 struct pnp_option *pnp_register_independent_option(struct pnp_dev *dev)
47 {
48         struct pnp_option *option;
49
50         if (!dev)
51                 return NULL;
52
53         option = pnp_build_option(PNP_RES_PRIORITY_PREFERRED);
54
55         /* this should never happen but if it does we'll try to continue */
56         if (dev->independent)
57                 pnp_err("independent resource already registered");
58         dev->independent = option;
59         return option;
60 }
61
62 struct pnp_option *pnp_register_dependent_option(struct pnp_dev *dev,
63                                                  int priority)
64 {
65         struct pnp_option *option;
66
67         if (!dev)
68                 return NULL;
69
70         option = pnp_build_option(priority);
71
72         if (dev->dependent) {
73                 struct pnp_option *parent = dev->dependent;
74                 while (parent->next)
75                         parent = parent->next;
76                 parent->next = option;
77         } else
78                 dev->dependent = option;
79         return option;
80 }
81
82 int pnp_register_irq_resource(struct pnp_option *option, struct pnp_irq *data)
83 {
84         struct pnp_irq *ptr;
85
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
115         if (!option)
116                 return -EINVAL;
117         if (!data)
118                 return -EINVAL;
119
120         ptr = option->dma;
121         while (ptr && ptr->next)
122                 ptr = ptr->next;
123         if (ptr)
124                 ptr->next = data;
125         else
126                 option->dma = data;
127
128         return 0;
129 }
130
131 int pnp_register_port_resource(struct pnp_option *option, struct pnp_port *data)
132 {
133         struct pnp_port *ptr;
134
135         if (!option)
136                 return -EINVAL;
137         if (!data)
138                 return -EINVAL;
139
140         ptr = option->port;
141         while (ptr && ptr->next)
142                 ptr = ptr->next;
143         if (ptr)
144                 ptr->next = data;
145         else
146                 option->port = data;
147
148         return 0;
149 }
150
151 int pnp_register_mem_resource(struct pnp_option *option, struct pnp_mem *data)
152 {
153         struct pnp_mem *ptr;
154
155         if (!option)
156                 return -EINVAL;
157         if (!data)
158                 return -EINVAL;
159
160         ptr = option->mem;
161         while (ptr && ptr->next)
162                 ptr = ptr->next;
163         if (ptr)
164                 ptr->next = data;
165         else
166                 option->mem = data;
167         return 0;
168 }
169
170 static void pnp_free_port(struct pnp_port *port)
171 {
172         struct pnp_port *next;
173
174         while (port) {
175                 next = port->next;
176                 kfree(port);
177                 port = next;
178         }
179 }
180
181 static void pnp_free_irq(struct pnp_irq *irq)
182 {
183         struct pnp_irq *next;
184
185         while (irq) {
186                 next = irq->next;
187                 kfree(irq);
188                 irq = next;
189         }
190 }
191
192 static void pnp_free_dma(struct pnp_dma *dma)
193 {
194         struct pnp_dma *next;
195
196         while (dma) {
197                 next = dma->next;
198                 kfree(dma);
199                 dma = next;
200         }
201 }
202
203 static void pnp_free_mem(struct pnp_mem *mem)
204 {
205         struct pnp_mem *next;
206
207         while (mem) {
208                 next = mem->next;
209                 kfree(mem);
210                 mem = next;
211         }
212 }
213
214 void pnp_free_option(struct pnp_option *option)
215 {
216         struct pnp_option *next;
217
218         while (option) {
219                 next = 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);
224                 kfree(option);
225                 option = next;
226         }
227 }
228
229 /*
230  * resource validity checking
231  */
232
233 #define length(start, end) (*(end) - *(start) + 1)
234
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)))
238
239 #define cannot_compare(flags) \
240 ((flags) & (IORESOURCE_UNSET | IORESOURCE_DISABLED))
241
242 int pnp_check_port(struct pnp_dev *dev, int idx)
243 {
244         int tmp;
245         struct pnp_dev *tdev;
246         resource_size_t *port, *end, *tport, *tend;
247
248         port = &dev->res.port_resource[idx].start;
249         end = &dev->res.port_resource[idx].end;
250
251         /* if the resource doesn't exist, don't complain about it */
252         if (cannot_compare(dev->res.port_resource[idx].flags))
253                 return 1;
254
255         /* check if the resource is already in use, skip if the
256          * device is active because it itself may be in use */
257         if (!dev->active) {
258                 if (__check_region(&ioport_resource, *port, length(port, end)))
259                         return 0;
260         }
261
262         /* check if the resource is reserved */
263         for (tmp = 0; tmp < 8; tmp++) {
264                 int rport = pnp_reserve_io[tmp << 1];
265                 int rend = pnp_reserve_io[(tmp << 1) + 1] + rport - 1;
266                 if (ranged_conflict(port, end, &rport, &rend))
267                         return 0;
268         }
269
270         /* check for internal conflicts */
271         for (tmp = 0; tmp < PNP_MAX_PORT && tmp != idx; tmp++) {
272                 if (dev->res.port_resource[tmp].flags & IORESOURCE_IO) {
273                         tport = &dev->res.port_resource[tmp].start;
274                         tend = &dev->res.port_resource[tmp].end;
275                         if (ranged_conflict(port, end, tport, tend))
276                                 return 0;
277                 }
278         }
279
280         /* check for conflicts with other pnp devices */
281         pnp_for_each_dev(tdev) {
282                 if (tdev == dev)
283                         continue;
284                 for (tmp = 0; tmp < PNP_MAX_PORT; tmp++) {
285                         if (tdev->res.port_resource[tmp].flags & IORESOURCE_IO) {
286                                 if (cannot_compare
287                                     (tdev->res.port_resource[tmp].flags))
288                                         continue;
289                                 tport = &tdev->res.port_resource[tmp].start;
290                                 tend = &tdev->res.port_resource[tmp].end;
291                                 if (ranged_conflict(port, end, tport, tend))
292                                         return 0;
293                         }
294                 }
295         }
296
297         return 1;
298 }
299
300 int pnp_check_mem(struct pnp_dev *dev, int idx)
301 {
302         int tmp;
303         struct pnp_dev *tdev;
304         resource_size_t *addr, *end, *taddr, *tend;
305
306         addr = &dev->res.mem_resource[idx].start;
307         end = &dev->res.mem_resource[idx].end;
308
309         /* if the resource doesn't exist, don't complain about it */
310         if (cannot_compare(dev->res.mem_resource[idx].flags))
311                 return 1;
312
313         /* check if the resource is already in use, skip if the
314          * device is active because it itself may be in use */
315         if (!dev->active) {
316                 if (check_mem_region(*addr, length(addr, end)))
317                         return 0;
318         }
319
320         /* check if the resource is reserved */
321         for (tmp = 0; tmp < 8; tmp++) {
322                 int raddr = pnp_reserve_mem[tmp << 1];
323                 int rend = pnp_reserve_mem[(tmp << 1) + 1] + raddr - 1;
324                 if (ranged_conflict(addr, end, &raddr, &rend))
325                         return 0;
326         }
327
328         /* check for internal conflicts */
329         for (tmp = 0; tmp < PNP_MAX_MEM && tmp != idx; tmp++) {
330                 if (dev->res.mem_resource[tmp].flags & IORESOURCE_MEM) {
331                         taddr = &dev->res.mem_resource[tmp].start;
332                         tend = &dev->res.mem_resource[tmp].end;
333                         if (ranged_conflict(addr, end, taddr, tend))
334                                 return 0;
335                 }
336         }
337
338         /* check for conflicts with other pnp devices */
339         pnp_for_each_dev(tdev) {
340                 if (tdev == dev)
341                         continue;
342                 for (tmp = 0; tmp < PNP_MAX_MEM; tmp++) {
343                         if (tdev->res.mem_resource[tmp].flags & IORESOURCE_MEM) {
344                                 if (cannot_compare
345                                     (tdev->res.mem_resource[tmp].flags))
346                                         continue;
347                                 taddr = &tdev->res.mem_resource[tmp].start;
348                                 tend = &tdev->res.mem_resource[tmp].end;
349                                 if (ranged_conflict(addr, end, taddr, tend))
350                                         return 0;
351                         }
352                 }
353         }
354
355         return 1;
356 }
357
358 static irqreturn_t pnp_test_handler(int irq, void *dev_id)
359 {
360         return IRQ_HANDLED;
361 }
362
363 int pnp_check_irq(struct pnp_dev *dev, int idx)
364 {
365         int tmp;
366         struct pnp_dev *tdev;
367         resource_size_t *irq = &dev->res.irq_resource[idx].start;
368
369         /* if the resource doesn't exist, don't complain about it */
370         if (cannot_compare(dev->res.irq_resource[idx].flags))
371                 return 1;
372
373         /* check if the resource is valid */
374         if (*irq < 0 || *irq > 15)
375                 return 0;
376
377         /* check if the resource is reserved */
378         for (tmp = 0; tmp < 16; tmp++) {
379                 if (pnp_reserve_irq[tmp] == *irq)
380                         return 0;
381         }
382
383         /* check for internal conflicts */
384         for (tmp = 0; tmp < PNP_MAX_IRQ && tmp != idx; tmp++) {
385                 if (dev->res.irq_resource[tmp].flags & IORESOURCE_IRQ) {
386                         if (dev->res.irq_resource[tmp].start == *irq)
387                                 return 0;
388                 }
389         }
390
391 #ifdef CONFIG_PCI
392         /* check if the resource is being used by a pci device */
393         {
394                 struct pci_dev *pci = NULL;
395                 for_each_pci_dev(pci) {
396                         if (pci->irq == *irq)
397                                 return 0;
398                 }
399         }
400 #endif
401
402         /* check if the resource is already in use, skip if the
403          * device is active because it itself may be in use */
404         if (!dev->active) {
405                 if (request_irq(*irq, pnp_test_handler,
406                                 IRQF_DISABLED | IRQF_PROBE_SHARED, "pnp", NULL))
407                         return 0;
408                 free_irq(*irq, NULL);
409         }
410
411         /* check for conflicts with other pnp devices */
412         pnp_for_each_dev(tdev) {
413                 if (tdev == dev)
414                         continue;
415                 for (tmp = 0; tmp < PNP_MAX_IRQ; tmp++) {
416                         if (tdev->res.irq_resource[tmp].flags & IORESOURCE_IRQ) {
417                                 if (cannot_compare
418                                     (tdev->res.irq_resource[tmp].flags))
419                                         continue;
420                                 if ((tdev->res.irq_resource[tmp].start == *irq))
421                                         return 0;
422                         }
423                 }
424         }
425
426         return 1;
427 }
428
429 int pnp_check_dma(struct pnp_dev *dev, int idx)
430 {
431 #ifndef CONFIG_IA64
432         int tmp;
433         struct pnp_dev *tdev;
434         resource_size_t *dma = &dev->res.dma_resource[idx].start;
435
436         /* if the resource doesn't exist, don't complain about it */
437         if (cannot_compare(dev->res.dma_resource[idx].flags))
438                 return 1;
439
440         /* check if the resource is valid */
441         if (*dma < 0 || *dma == 4 || *dma > 7)
442                 return 0;
443
444         /* check if the resource is reserved */
445         for (tmp = 0; tmp < 8; tmp++) {
446                 if (pnp_reserve_dma[tmp] == *dma)
447                         return 0;
448         }
449
450         /* check for internal conflicts */
451         for (tmp = 0; tmp < PNP_MAX_DMA && tmp != idx; tmp++) {
452                 if (dev->res.dma_resource[tmp].flags & IORESOURCE_DMA) {
453                         if (dev->res.dma_resource[tmp].start == *dma)
454                                 return 0;
455                 }
456         }
457
458         /* check if the resource is already in use, skip if the
459          * device is active because it itself may be in use */
460         if (!dev->active) {
461                 if (request_dma(*dma, "pnp"))
462                         return 0;
463                 free_dma(*dma);
464         }
465
466         /* check for conflicts with other pnp devices */
467         pnp_for_each_dev(tdev) {
468                 if (tdev == dev)
469                         continue;
470                 for (tmp = 0; tmp < PNP_MAX_DMA; tmp++) {
471                         if (tdev->res.dma_resource[tmp].flags & IORESOURCE_DMA) {
472                                 if (cannot_compare
473                                     (tdev->res.dma_resource[tmp].flags))
474                                         continue;
475                                 if ((tdev->res.dma_resource[tmp].start == *dma))
476                                         return 0;
477                         }
478                 }
479         }
480
481         return 1;
482 #else
483         /* IA64 does not have legacy DMA */
484         return 0;
485 #endif
486 }
487
488 /* format is: pnp_reserve_irq=irq1[,irq2] .... */
489 static int __init pnp_setup_reserve_irq(char *str)
490 {
491         int i;
492
493         for (i = 0; i < 16; i++)
494                 if (get_option(&str, &pnp_reserve_irq[i]) != 2)
495                         break;
496         return 1;
497 }
498
499 __setup("pnp_reserve_irq=", pnp_setup_reserve_irq);
500
501 /* format is: pnp_reserve_dma=dma1[,dma2] .... */
502 static int __init pnp_setup_reserve_dma(char *str)
503 {
504         int i;
505
506         for (i = 0; i < 8; i++)
507                 if (get_option(&str, &pnp_reserve_dma[i]) != 2)
508                         break;
509         return 1;
510 }
511
512 __setup("pnp_reserve_dma=", pnp_setup_reserve_dma);
513
514 /* format is: pnp_reserve_io=io1,size1[,io2,size2] .... */
515 static int __init pnp_setup_reserve_io(char *str)
516 {
517         int i;
518
519         for (i = 0; i < 16; i++)
520                 if (get_option(&str, &pnp_reserve_io[i]) != 2)
521                         break;
522         return 1;
523 }
524
525 __setup("pnp_reserve_io=", pnp_setup_reserve_io);
526
527 /* format is: pnp_reserve_mem=mem1,size1[,mem2,size2] .... */
528 static int __init pnp_setup_reserve_mem(char *str)
529 {
530         int i;
531
532         for (i = 0; i < 16; i++)
533                 if (get_option(&str, &pnp_reserve_mem[i]) != 2)
534                         break;
535         return 1;
536 }
537
538 __setup("pnp_reserve_mem=", pnp_setup_reserve_mem);