1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * rsrc_nonstatic.c -- Resource management routines for !SS_CAP_STATIC_MAP sockets |
4 | * |
5 | * The initial developer of the original code is David A. Hinds |
6 | * <dahinds@users.sourceforge.net>. Portions created by David A. Hinds |
7 | * are Copyright (C) 1999 David A. Hinds. All Rights Reserved. |
8 | * |
9 | * (C) 1999 David A. Hinds |
10 | */ |
11 | |
12 | #include <linux/module.h> |
13 | #include <linux/moduleparam.h> |
14 | #include <linux/init.h> |
15 | #include <linux/interrupt.h> |
16 | #include <linux/kernel.h> |
17 | #include <linux/errno.h> |
18 | #include <linux/types.h> |
19 | #include <linux/slab.h> |
20 | #include <linux/ioport.h> |
21 | #include <linux/timer.h> |
22 | #include <linux/pci.h> |
23 | #include <linux/device.h> |
24 | #include <linux/io.h> |
25 | |
26 | #include <asm/irq.h> |
27 | |
28 | #include <pcmcia/ss.h> |
29 | #include <pcmcia/cistpl.h> |
30 | #include "cs_internal.h" |
31 | |
32 | /* moved to rsrc_mgr.c |
33 | MODULE_AUTHOR("David A. Hinds, Dominik Brodowski"); |
34 | MODULE_LICENSE("GPL"); |
35 | */ |
36 | |
37 | /* Parameters that can be set with 'insmod' */ |
38 | |
39 | #define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0444) |
40 | |
41 | INT_MODULE_PARM(probe_mem, 1); /* memory probe? */ |
42 | #ifdef CONFIG_PCMCIA_PROBE |
43 | INT_MODULE_PARM(probe_io, 1); /* IO port probe? */ |
44 | INT_MODULE_PARM(mem_limit, 0x10000); |
45 | #endif |
46 | |
47 | /* for io_db and mem_db */ |
48 | struct resource_map { |
49 | u_long base, num; |
50 | struct resource_map *next; |
51 | }; |
52 | |
53 | struct socket_data { |
54 | struct resource_map mem_db; |
55 | struct resource_map mem_db_valid; |
56 | struct resource_map io_db; |
57 | }; |
58 | |
59 | #define MEM_PROBE_LOW (1 << 0) |
60 | #define MEM_PROBE_HIGH (1 << 1) |
61 | |
62 | /* Action field */ |
63 | #define REMOVE_MANAGED_RESOURCE 1 |
64 | #define ADD_MANAGED_RESOURCE 2 |
65 | |
66 | /*====================================================================== |
67 | |
68 | Linux resource management extensions |
69 | |
70 | ======================================================================*/ |
71 | |
72 | static struct resource * |
73 | claim_region(struct pcmcia_socket *s, resource_size_t base, |
74 | resource_size_t size, int type, char *name) |
75 | { |
76 | struct resource *res, *parent; |
77 | |
78 | parent = type & IORESOURCE_MEM ? &iomem_resource : &ioport_resource; |
79 | res = pcmcia_make_resource(start: base, end: size, flags: type | IORESOURCE_BUSY, name); |
80 | |
81 | if (res) { |
82 | #ifdef CONFIG_PCI |
83 | if (s && s->cb_dev) |
84 | parent = pci_find_parent_resource(dev: s->cb_dev, res); |
85 | #endif |
86 | if (!parent || request_resource(root: parent, new: res)) { |
87 | kfree(objp: res); |
88 | res = NULL; |
89 | } |
90 | } |
91 | return res; |
92 | } |
93 | |
94 | static void free_region(struct resource *res) |
95 | { |
96 | if (res) { |
97 | release_resource(new: res); |
98 | kfree(objp: res); |
99 | } |
100 | } |
101 | |
102 | /*====================================================================== |
103 | |
104 | These manage the internal databases of available resources. |
105 | |
106 | ======================================================================*/ |
107 | |
108 | static int add_interval(struct resource_map *map, u_long base, u_long num) |
109 | { |
110 | struct resource_map *p, *q; |
111 | |
112 | for (p = map; ; p = p->next) { |
113 | if ((p != map) && (p->base+p->num >= base)) { |
114 | p->num = max(num + base - p->base, p->num); |
115 | return 0; |
116 | } |
117 | if ((p->next == map) || (p->next->base > base+num-1)) |
118 | break; |
119 | } |
120 | q = kmalloc(size: sizeof(struct resource_map), GFP_KERNEL); |
121 | if (!q) { |
122 | printk(KERN_WARNING "out of memory to update resources\n" ); |
123 | return -ENOMEM; |
124 | } |
125 | q->base = base; q->num = num; |
126 | q->next = p->next; p->next = q; |
127 | return 0; |
128 | } |
129 | |
130 | /*====================================================================*/ |
131 | |
132 | static int sub_interval(struct resource_map *map, u_long base, u_long num) |
133 | { |
134 | struct resource_map *p, *q; |
135 | |
136 | for (p = map; ; p = q) { |
137 | q = p->next; |
138 | if (q == map) |
139 | break; |
140 | if ((q->base+q->num > base) && (base+num > q->base)) { |
141 | if (q->base >= base) { |
142 | if (q->base+q->num <= base+num) { |
143 | /* Delete whole block */ |
144 | p->next = q->next; |
145 | kfree(objp: q); |
146 | /* don't advance the pointer yet */ |
147 | q = p; |
148 | } else { |
149 | /* Cut off bit from the front */ |
150 | q->num = q->base + q->num - base - num; |
151 | q->base = base + num; |
152 | } |
153 | } else if (q->base+q->num <= base+num) { |
154 | /* Cut off bit from the end */ |
155 | q->num = base - q->base; |
156 | } else { |
157 | /* Split the block into two pieces */ |
158 | p = kmalloc(size: sizeof(struct resource_map), |
159 | GFP_KERNEL); |
160 | if (!p) { |
161 | printk(KERN_WARNING "out of memory to update resources\n" ); |
162 | return -ENOMEM; |
163 | } |
164 | p->base = base+num; |
165 | p->num = q->base+q->num - p->base; |
166 | q->num = base - q->base; |
167 | p->next = q->next ; q->next = p; |
168 | } |
169 | } |
170 | } |
171 | return 0; |
172 | } |
173 | |
174 | /*====================================================================== |
175 | |
176 | These routines examine a region of IO or memory addresses to |
177 | determine what ranges might be genuinely available. |
178 | |
179 | ======================================================================*/ |
180 | |
181 | #ifdef CONFIG_PCMCIA_PROBE |
182 | static void do_io_probe(struct pcmcia_socket *s, unsigned int base, |
183 | unsigned int num) |
184 | { |
185 | struct resource *res; |
186 | struct socket_data *s_data = s->resource_data; |
187 | unsigned int i, j, bad; |
188 | int any; |
189 | u_char *b, hole, most; |
190 | |
191 | dev_info(&s->dev, "cs: IO port probe %#x-%#x:" , base, base+num-1); |
192 | |
193 | /* First, what does a floating port look like? */ |
194 | b = kzalloc(256, GFP_KERNEL); |
195 | if (!b) { |
196 | pr_cont("\n" ); |
197 | dev_err(&s->dev, "do_io_probe: unable to kmalloc 256 bytes\n" ); |
198 | return; |
199 | } |
200 | for (i = base, most = 0; i < base+num; i += 8) { |
201 | res = claim_region(s, i, 8, IORESOURCE_IO, "PCMCIA ioprobe" ); |
202 | if (!res) |
203 | continue; |
204 | hole = inb(i); |
205 | for (j = 1; j < 8; j++) |
206 | if (inb(i+j) != hole) |
207 | break; |
208 | free_region(res); |
209 | if ((j == 8) && (++b[hole] > b[most])) |
210 | most = hole; |
211 | if (b[most] == 127) |
212 | break; |
213 | } |
214 | kfree(b); |
215 | |
216 | bad = any = 0; |
217 | for (i = base; i < base+num; i += 8) { |
218 | res = claim_region(s, i, 8, IORESOURCE_IO, "PCMCIA ioprobe" ); |
219 | if (!res) { |
220 | if (!any) |
221 | pr_cont(" excluding" ); |
222 | if (!bad) |
223 | bad = any = i; |
224 | continue; |
225 | } |
226 | for (j = 0; j < 8; j++) |
227 | if (inb(i+j) != most) |
228 | break; |
229 | free_region(res); |
230 | if (j < 8) { |
231 | if (!any) |
232 | pr_cont(" excluding" ); |
233 | if (!bad) |
234 | bad = any = i; |
235 | } else { |
236 | if (bad) { |
237 | sub_interval(&s_data->io_db, bad, i-bad); |
238 | pr_cont(" %#x-%#x" , bad, i-1); |
239 | bad = 0; |
240 | } |
241 | } |
242 | } |
243 | if (bad) { |
244 | if ((num > 16) && (bad == base) && (i == base+num)) { |
245 | sub_interval(&s_data->io_db, bad, i-bad); |
246 | pr_cont(" nothing: probe failed.\n" ); |
247 | return; |
248 | } else { |
249 | sub_interval(&s_data->io_db, bad, i-bad); |
250 | pr_cont(" %#x-%#x" , bad, i-1); |
251 | } |
252 | } |
253 | |
254 | pr_cont("%s\n" , !any ? " clean" : "" ); |
255 | } |
256 | #endif |
257 | |
258 | /*======================================================================*/ |
259 | |
260 | /* |
261 | * readable() - iomem validation function for cards with a valid CIS |
262 | */ |
263 | static int readable(struct pcmcia_socket *s, struct resource *res, |
264 | unsigned int *count) |
265 | { |
266 | int ret = -EINVAL; |
267 | |
268 | if (s->fake_cis) { |
269 | dev_dbg(&s->dev, "fake CIS is being used: can't validate mem\n" ); |
270 | return 0; |
271 | } |
272 | |
273 | s->cis_mem.res = res; |
274 | s->cis_virt = ioremap(offset: res->start, size: s->map_size); |
275 | if (s->cis_virt) { |
276 | mutex_unlock(lock: &s->ops_mutex); |
277 | /* as we're only called from pcmcia.c, we're safe */ |
278 | if (s->callback->validate) |
279 | ret = s->callback->validate(s, count); |
280 | /* invalidate mapping */ |
281 | mutex_lock(&s->ops_mutex); |
282 | iounmap(addr: s->cis_virt); |
283 | s->cis_virt = NULL; |
284 | } |
285 | s->cis_mem.res = NULL; |
286 | if ((ret) || (*count == 0)) |
287 | return -EINVAL; |
288 | return 0; |
289 | } |
290 | |
291 | /* |
292 | * checksum() - iomem validation function for simple memory cards |
293 | */ |
294 | static int checksum(struct pcmcia_socket *s, struct resource *res, |
295 | unsigned int *value) |
296 | { |
297 | pccard_mem_map map; |
298 | int i, a = 0, b = -1, d; |
299 | void __iomem *virt; |
300 | |
301 | virt = ioremap(offset: res->start, size: s->map_size); |
302 | if (virt) { |
303 | map.map = 0; |
304 | map.flags = MAP_ACTIVE; |
305 | map.speed = 0; |
306 | map.res = res; |
307 | map.card_start = 0; |
308 | s->ops->set_mem_map(s, &map); |
309 | |
310 | /* Don't bother checking every word... */ |
311 | for (i = 0; i < s->map_size; i += 44) { |
312 | d = readl(addr: virt+i); |
313 | a += d; |
314 | b &= d; |
315 | } |
316 | |
317 | map.flags = 0; |
318 | s->ops->set_mem_map(s, &map); |
319 | |
320 | iounmap(addr: virt); |
321 | } |
322 | |
323 | if (b == -1) |
324 | return -EINVAL; |
325 | |
326 | *value = a; |
327 | |
328 | return 0; |
329 | } |
330 | |
331 | /** |
332 | * do_validate_mem() - low level validate a memory region for PCMCIA use |
333 | * @s: PCMCIA socket to validate |
334 | * @base: start address of resource to check |
335 | * @size: size of resource to check |
336 | * @validate: validation function to use |
337 | * |
338 | * do_validate_mem() splits up the memory region which is to be checked |
339 | * into two parts. Both are passed to the @validate() function. If |
340 | * @validate() returns non-zero, or the value parameter to @validate() |
341 | * is zero, or the value parameter is different between both calls, |
342 | * the check fails, and -EINVAL is returned. Else, 0 is returned. |
343 | */ |
344 | static int do_validate_mem(struct pcmcia_socket *s, |
345 | unsigned long base, unsigned long size, |
346 | int (*validate)(struct pcmcia_socket *s, |
347 | struct resource *res, |
348 | unsigned int *value)) |
349 | { |
350 | struct socket_data *s_data = s->resource_data; |
351 | struct resource *res1, *res2; |
352 | unsigned int info1 = 1, info2 = 1; |
353 | int ret = -EINVAL; |
354 | |
355 | res1 = claim_region(s, base, size: size/2, IORESOURCE_MEM, name: "PCMCIA memprobe" ); |
356 | res2 = claim_region(s, base: base + size/2, size: size/2, IORESOURCE_MEM, |
357 | name: "PCMCIA memprobe" ); |
358 | |
359 | if (res1 && res2) { |
360 | ret = 0; |
361 | if (validate) { |
362 | ret = validate(s, res1, &info1); |
363 | ret += validate(s, res2, &info2); |
364 | } |
365 | } |
366 | |
367 | dev_dbg(&s->dev, "cs: memory probe 0x%06lx-0x%06lx: %pr %pr %u %u %u" , |
368 | base, base+size-1, res1, res2, ret, info1, info2); |
369 | |
370 | free_region(res: res2); |
371 | free_region(res: res1); |
372 | |
373 | if ((ret) || (info1 != info2) || (info1 == 0)) |
374 | return -EINVAL; |
375 | |
376 | if (validate && !s->fake_cis) { |
377 | /* move it to the validated data set */ |
378 | add_interval(map: &s_data->mem_db_valid, base, num: size); |
379 | sub_interval(map: &s_data->mem_db, base, num: size); |
380 | } |
381 | |
382 | return 0; |
383 | } |
384 | |
385 | |
386 | /** |
387 | * do_mem_probe() - validate a memory region for PCMCIA use |
388 | * @s: PCMCIA socket to validate |
389 | * @base: start address of resource to check |
390 | * @num: size of resource to check |
391 | * @validate: validation function to use |
392 | * @fallback: validation function to use if validate fails |
393 | * |
394 | * do_mem_probe() checks a memory region for use by the PCMCIA subsystem. |
395 | * To do so, the area is split up into sensible parts, and then passed |
396 | * into the @validate() function. Only if @validate() and @fallback() fail, |
397 | * the area is marked as unavailable for use by the PCMCIA subsystem. The |
398 | * function returns the size of the usable memory area. |
399 | */ |
400 | static int do_mem_probe(struct pcmcia_socket *s, u_long base, u_long num, |
401 | int (*validate)(struct pcmcia_socket *s, |
402 | struct resource *res, |
403 | unsigned int *value), |
404 | int (*fallback)(struct pcmcia_socket *s, |
405 | struct resource *res, |
406 | unsigned int *value)) |
407 | { |
408 | struct socket_data *s_data = s->resource_data; |
409 | u_long i, j, bad, fail, step; |
410 | |
411 | dev_info(&s->dev, "cs: memory probe 0x%06lx-0x%06lx:" , |
412 | base, base+num-1); |
413 | bad = fail = 0; |
414 | step = (num < 0x20000) ? 0x2000 : ((num>>4) & ~0x1fff); |
415 | /* don't allow too large steps */ |
416 | if (step > 0x800000) |
417 | step = 0x800000; |
418 | /* cis_readable wants to map 2x map_size */ |
419 | if (step < 2 * s->map_size) |
420 | step = 2 * s->map_size; |
421 | for (i = j = base; i < base+num; i = j + step) { |
422 | if (!fail) { |
423 | for (j = i; j < base+num; j += step) { |
424 | if (!do_validate_mem(s, base: j, size: step, validate)) |
425 | break; |
426 | } |
427 | fail = ((i == base) && (j == base+num)); |
428 | } |
429 | if ((fail) && (fallback)) { |
430 | for (j = i; j < base+num; j += step) |
431 | if (!do_validate_mem(s, base: j, size: step, validate: fallback)) |
432 | break; |
433 | } |
434 | if (i != j) { |
435 | if (!bad) |
436 | pr_cont(" excluding" ); |
437 | pr_cont(" %#05lx-%#05lx" , i, j-1); |
438 | sub_interval(map: &s_data->mem_db, base: i, num: j-i); |
439 | bad += j-i; |
440 | } |
441 | } |
442 | pr_cont("%s\n" , !bad ? " clean" : "" ); |
443 | return num - bad; |
444 | } |
445 | |
446 | |
447 | #ifdef CONFIG_PCMCIA_PROBE |
448 | |
449 | /** |
450 | * inv_probe() - top-to-bottom search for one usuable high memory area |
451 | * @s: PCMCIA socket to validate |
452 | * @m: resource_map to check |
453 | */ |
454 | static u_long inv_probe(struct resource_map *m, struct pcmcia_socket *s) |
455 | { |
456 | struct socket_data *s_data = s->resource_data; |
457 | u_long ok; |
458 | if (m == &s_data->mem_db) |
459 | return 0; |
460 | ok = inv_probe(m->next, s); |
461 | if (ok) { |
462 | if (m->base >= 0x100000) |
463 | sub_interval(&s_data->mem_db, m->base, m->num); |
464 | return ok; |
465 | } |
466 | if (m->base < 0x100000) |
467 | return 0; |
468 | return do_mem_probe(s, m->base, m->num, readable, checksum); |
469 | } |
470 | |
471 | /** |
472 | * validate_mem() - memory probe function |
473 | * @s: PCMCIA socket to validate |
474 | * @probe_mask: MEM_PROBE_LOW | MEM_PROBE_HIGH |
475 | * |
476 | * The memory probe. If the memory list includes a 64K-aligned block |
477 | * below 1MB, we probe in 64K chunks, and as soon as we accumulate at |
478 | * least mem_limit free space, we quit. Returns 0 on usuable ports. |
479 | */ |
480 | static int validate_mem(struct pcmcia_socket *s, unsigned int probe_mask) |
481 | { |
482 | struct resource_map *m, mm; |
483 | static unsigned char order[] = { 0xd0, 0xe0, 0xc0, 0xf0 }; |
484 | unsigned long b, i, ok = 0; |
485 | struct socket_data *s_data = s->resource_data; |
486 | |
487 | /* We do up to four passes through the list */ |
488 | if (probe_mask & MEM_PROBE_HIGH) { |
489 | if (inv_probe(s_data->mem_db.next, s) > 0) |
490 | return 0; |
491 | if (s_data->mem_db_valid.next != &s_data->mem_db_valid) |
492 | return 0; |
493 | dev_notice(&s->dev, |
494 | "cs: warning: no high memory space available!\n" ); |
495 | return -ENODEV; |
496 | } |
497 | |
498 | for (m = s_data->mem_db.next; m != &s_data->mem_db; m = mm.next) { |
499 | mm = *m; |
500 | /* Only probe < 1 MB */ |
501 | if (mm.base >= 0x100000) |
502 | continue; |
503 | if ((mm.base | mm.num) & 0xffff) { |
504 | ok += do_mem_probe(s, mm.base, mm.num, readable, |
505 | checksum); |
506 | continue; |
507 | } |
508 | /* Special probe for 64K-aligned block */ |
509 | for (i = 0; i < 4; i++) { |
510 | b = order[i] << 12; |
511 | if ((b >= mm.base) && (b+0x10000 <= mm.base+mm.num)) { |
512 | if (ok >= mem_limit) |
513 | sub_interval(&s_data->mem_db, b, 0x10000); |
514 | else |
515 | ok += do_mem_probe(s, b, 0x10000, |
516 | readable, checksum); |
517 | } |
518 | } |
519 | } |
520 | |
521 | if (ok > 0) |
522 | return 0; |
523 | |
524 | return -ENODEV; |
525 | } |
526 | |
527 | #else /* CONFIG_PCMCIA_PROBE */ |
528 | |
529 | /** |
530 | * validate_mem() - memory probe function |
531 | * @s: PCMCIA socket to validate |
532 | * @probe_mask: ignored |
533 | * |
534 | * Returns 0 on usuable ports. |
535 | */ |
536 | static int validate_mem(struct pcmcia_socket *s, unsigned int probe_mask) |
537 | { |
538 | struct resource_map *m, mm; |
539 | struct socket_data *s_data = s->resource_data; |
540 | unsigned long ok = 0; |
541 | |
542 | for (m = s_data->mem_db.next; m != &s_data->mem_db; m = mm.next) { |
543 | mm = *m; |
544 | ok += do_mem_probe(s, base: mm.base, num: mm.num, validate: readable, fallback: checksum); |
545 | } |
546 | if (ok > 0) |
547 | return 0; |
548 | return -ENODEV; |
549 | } |
550 | |
551 | #endif /* CONFIG_PCMCIA_PROBE */ |
552 | |
553 | |
554 | /** |
555 | * pcmcia_nonstatic_validate_mem() - try to validate iomem for PCMCIA use |
556 | * @s: PCMCIA socket to validate |
557 | * |
558 | * This is tricky... when we set up CIS memory, we try to validate |
559 | * the memory window space allocations. |
560 | * |
561 | * Locking note: Must be called with skt_mutex held! |
562 | */ |
563 | static int pcmcia_nonstatic_validate_mem(struct pcmcia_socket *s) |
564 | { |
565 | struct socket_data *s_data = s->resource_data; |
566 | unsigned int probe_mask = MEM_PROBE_LOW; |
567 | int ret; |
568 | |
569 | if (!probe_mem || !(s->state & SOCKET_PRESENT)) |
570 | return 0; |
571 | |
572 | if (s->features & SS_CAP_PAGE_REGS) |
573 | probe_mask = MEM_PROBE_HIGH; |
574 | |
575 | ret = validate_mem(s, probe_mask); |
576 | |
577 | if (s_data->mem_db_valid.next != &s_data->mem_db_valid) |
578 | return 0; |
579 | |
580 | return ret; |
581 | } |
582 | |
583 | struct pcmcia_align_data { |
584 | unsigned long mask; |
585 | unsigned long offset; |
586 | struct resource_map *map; |
587 | }; |
588 | |
589 | static resource_size_t pcmcia_common_align(struct pcmcia_align_data *align_data, |
590 | resource_size_t start) |
591 | { |
592 | resource_size_t ret; |
593 | /* |
594 | * Ensure that we have the correct start address |
595 | */ |
596 | ret = (start & ~align_data->mask) + align_data->offset; |
597 | if (ret < start) |
598 | ret += align_data->mask + 1; |
599 | return ret; |
600 | } |
601 | |
602 | static resource_size_t |
603 | pcmcia_align(void *align_data, const struct resource *res, |
604 | resource_size_t size, resource_size_t align) |
605 | { |
606 | struct pcmcia_align_data *data = align_data; |
607 | struct resource_map *m; |
608 | resource_size_t start; |
609 | |
610 | start = pcmcia_common_align(align_data: data, start: res->start); |
611 | |
612 | for (m = data->map->next; m != data->map; m = m->next) { |
613 | unsigned long map_start = m->base; |
614 | unsigned long map_end = m->base + m->num - 1; |
615 | |
616 | /* |
617 | * If the lower resources are not available, try aligning |
618 | * to this entry of the resource database to see if it'll |
619 | * fit here. |
620 | */ |
621 | if (start < map_start) |
622 | start = pcmcia_common_align(align_data: data, start: map_start); |
623 | |
624 | /* |
625 | * If we're above the area which was passed in, there's |
626 | * no point proceeding. |
627 | */ |
628 | if (start >= res->end) |
629 | break; |
630 | |
631 | if ((start + size - 1) <= map_end) |
632 | break; |
633 | } |
634 | |
635 | /* |
636 | * If we failed to find something suitable, ensure we fail. |
637 | */ |
638 | if (m == data->map) |
639 | start = res->end; |
640 | |
641 | return start; |
642 | } |
643 | |
644 | /* |
645 | * Adjust an existing IO region allocation, but making sure that we don't |
646 | * encroach outside the resources which the user supplied. |
647 | */ |
648 | static int __nonstatic_adjust_io_region(struct pcmcia_socket *s, |
649 | unsigned long r_start, |
650 | unsigned long r_end) |
651 | { |
652 | struct resource_map *m; |
653 | struct socket_data *s_data = s->resource_data; |
654 | int ret = -ENOMEM; |
655 | |
656 | for (m = s_data->io_db.next; m != &s_data->io_db; m = m->next) { |
657 | unsigned long start = m->base; |
658 | unsigned long end = m->base + m->num - 1; |
659 | |
660 | if (start > r_start || r_end > end) |
661 | continue; |
662 | |
663 | ret = 0; |
664 | } |
665 | |
666 | return ret; |
667 | } |
668 | |
669 | /*====================================================================== |
670 | |
671 | These find ranges of I/O ports or memory addresses that are not |
672 | currently allocated by other devices. |
673 | |
674 | The 'align' field should reflect the number of bits of address |
675 | that need to be preserved from the initial value of *base. It |
676 | should be a power of two, greater than or equal to 'num'. A value |
677 | of 0 means that all bits of *base are significant. *base should |
678 | also be strictly less than 'align'. |
679 | |
680 | ======================================================================*/ |
681 | |
682 | static struct resource *__nonstatic_find_io_region(struct pcmcia_socket *s, |
683 | unsigned long base, int num, |
684 | unsigned long align) |
685 | { |
686 | struct resource *res = pcmcia_make_resource(start: 0, end: num, IORESOURCE_IO, |
687 | name: dev_name(dev: &s->dev)); |
688 | struct socket_data *s_data = s->resource_data; |
689 | struct pcmcia_align_data data; |
690 | unsigned long min = base; |
691 | int ret; |
692 | |
693 | if (!res) |
694 | return NULL; |
695 | |
696 | data.mask = align - 1; |
697 | data.offset = base & data.mask; |
698 | data.map = &s_data->io_db; |
699 | |
700 | #ifdef CONFIG_PCI |
701 | if (s->cb_dev) { |
702 | ret = pci_bus_alloc_resource(bus: s->cb_dev->bus, res, size: num, align: 1, |
703 | min, type_mask: 0, alignf: pcmcia_align, alignf_data: &data); |
704 | } else |
705 | #endif |
706 | ret = allocate_resource(root: &ioport_resource, new: res, size: num, min, max: ~0UL, |
707 | align: 1, alignf: pcmcia_align, alignf_data: &data); |
708 | |
709 | if (ret != 0) { |
710 | kfree(objp: res); |
711 | res = NULL; |
712 | } |
713 | return res; |
714 | } |
715 | |
716 | static int nonstatic_find_io(struct pcmcia_socket *s, unsigned int attr, |
717 | unsigned int *base, unsigned int num, |
718 | unsigned int align, struct resource **parent) |
719 | { |
720 | int i, ret = 0; |
721 | |
722 | /* Check for an already-allocated window that must conflict with |
723 | * what was asked for. It is a hack because it does not catch all |
724 | * potential conflicts, just the most obvious ones. |
725 | */ |
726 | for (i = 0; i < MAX_IO_WIN; i++) { |
727 | if (!s->io[i].res) |
728 | continue; |
729 | |
730 | if (!*base) |
731 | continue; |
732 | |
733 | if ((s->io[i].res->start & (align-1)) == *base) |
734 | return -EBUSY; |
735 | } |
736 | |
737 | for (i = 0; i < MAX_IO_WIN; i++) { |
738 | struct resource *res = s->io[i].res; |
739 | unsigned int try; |
740 | |
741 | if (res && (res->flags & IORESOURCE_BITS) != |
742 | (attr & IORESOURCE_BITS)) |
743 | continue; |
744 | |
745 | if (!res) { |
746 | if (align == 0) |
747 | align = 0x10000; |
748 | |
749 | res = s->io[i].res = __nonstatic_find_io_region(s, |
750 | base: *base, num, |
751 | align); |
752 | if (!res) |
753 | return -EINVAL; |
754 | |
755 | *base = res->start; |
756 | s->io[i].res->flags = |
757 | ((res->flags & ~IORESOURCE_BITS) | |
758 | (attr & IORESOURCE_BITS)); |
759 | s->io[i].InUse = num; |
760 | *parent = res; |
761 | return 0; |
762 | } |
763 | |
764 | /* Try to extend top of window */ |
765 | try = res->end + 1; |
766 | if ((*base == 0) || (*base == try)) { |
767 | ret = __nonstatic_adjust_io_region(s, r_start: res->start, |
768 | r_end: res->end + num); |
769 | if (!ret) { |
770 | ret = adjust_resource(res: s->io[i].res, start: res->start, |
771 | size: resource_size(res) + num); |
772 | if (ret) |
773 | continue; |
774 | *base = try; |
775 | s->io[i].InUse += num; |
776 | *parent = res; |
777 | return 0; |
778 | } |
779 | } |
780 | |
781 | /* Try to extend bottom of window */ |
782 | try = res->start - num; |
783 | if ((*base == 0) || (*base == try)) { |
784 | ret = __nonstatic_adjust_io_region(s, |
785 | r_start: res->start - num, |
786 | r_end: res->end); |
787 | if (!ret) { |
788 | ret = adjust_resource(res: s->io[i].res, |
789 | start: res->start - num, |
790 | size: resource_size(res) + num); |
791 | if (ret) |
792 | continue; |
793 | *base = try; |
794 | s->io[i].InUse += num; |
795 | *parent = res; |
796 | return 0; |
797 | } |
798 | } |
799 | } |
800 | |
801 | return -EINVAL; |
802 | } |
803 | |
804 | |
805 | static struct resource *nonstatic_find_mem_region(u_long base, u_long num, |
806 | u_long align, int low, struct pcmcia_socket *s) |
807 | { |
808 | struct resource *res = pcmcia_make_resource(start: 0, end: num, IORESOURCE_MEM, |
809 | name: dev_name(dev: &s->dev)); |
810 | struct socket_data *s_data = s->resource_data; |
811 | struct pcmcia_align_data data; |
812 | unsigned long min, max; |
813 | int ret, i, j; |
814 | |
815 | if (!res) |
816 | return NULL; |
817 | |
818 | low = low || !(s->features & SS_CAP_PAGE_REGS); |
819 | |
820 | data.mask = align - 1; |
821 | data.offset = base & data.mask; |
822 | |
823 | for (i = 0; i < 2; i++) { |
824 | data.map = &s_data->mem_db_valid; |
825 | if (low) { |
826 | max = 0x100000UL; |
827 | min = base < max ? base : 0; |
828 | } else { |
829 | max = ~0UL; |
830 | min = 0x100000UL + base; |
831 | } |
832 | |
833 | for (j = 0; j < 2; j++) { |
834 | #ifdef CONFIG_PCI |
835 | if (s->cb_dev) { |
836 | ret = pci_bus_alloc_resource(bus: s->cb_dev->bus, |
837 | res, size: num, align: 1, min, type_mask: 0, |
838 | alignf: pcmcia_align, alignf_data: &data); |
839 | } else |
840 | #endif |
841 | { |
842 | ret = allocate_resource(root: &iomem_resource, |
843 | new: res, size: num, min, max, align: 1, |
844 | alignf: pcmcia_align, alignf_data: &data); |
845 | } |
846 | if (ret == 0) |
847 | break; |
848 | data.map = &s_data->mem_db; |
849 | } |
850 | if (ret == 0 || low) |
851 | break; |
852 | low = 1; |
853 | } |
854 | |
855 | if (ret != 0) { |
856 | kfree(objp: res); |
857 | res = NULL; |
858 | } |
859 | return res; |
860 | } |
861 | |
862 | |
863 | static int adjust_memory(struct pcmcia_socket *s, unsigned int action, unsigned long start, unsigned long end) |
864 | { |
865 | struct socket_data *data = s->resource_data; |
866 | unsigned long size = end - start + 1; |
867 | int ret = 0; |
868 | |
869 | if (end < start) |
870 | return -EINVAL; |
871 | |
872 | switch (action) { |
873 | case ADD_MANAGED_RESOURCE: |
874 | ret = add_interval(map: &data->mem_db, base: start, num: size); |
875 | if (!ret) |
876 | do_mem_probe(s, base: start, num: size, NULL, NULL); |
877 | break; |
878 | case REMOVE_MANAGED_RESOURCE: |
879 | ret = sub_interval(map: &data->mem_db, base: start, num: size); |
880 | break; |
881 | default: |
882 | ret = -EINVAL; |
883 | } |
884 | |
885 | return ret; |
886 | } |
887 | |
888 | |
889 | static int adjust_io(struct pcmcia_socket *s, unsigned int action, unsigned long start, unsigned long end) |
890 | { |
891 | struct socket_data *data = s->resource_data; |
892 | unsigned long size; |
893 | int ret = 0; |
894 | |
895 | #if defined(CONFIG_X86) |
896 | /* on x86, avoid anything < 0x100 for it is often used for |
897 | * legacy platform devices */ |
898 | if (start < 0x100) |
899 | start = 0x100; |
900 | #endif |
901 | |
902 | size = end - start + 1; |
903 | |
904 | if (end < start) |
905 | return -EINVAL; |
906 | |
907 | if (end > IO_SPACE_LIMIT) |
908 | return -EINVAL; |
909 | |
910 | switch (action) { |
911 | case ADD_MANAGED_RESOURCE: |
912 | if (add_interval(map: &data->io_db, base: start, num: size) != 0) { |
913 | ret = -EBUSY; |
914 | break; |
915 | } |
916 | #ifdef CONFIG_PCMCIA_PROBE |
917 | if (probe_io) |
918 | do_io_probe(s, start, size); |
919 | #endif |
920 | break; |
921 | case REMOVE_MANAGED_RESOURCE: |
922 | sub_interval(map: &data->io_db, base: start, num: size); |
923 | break; |
924 | default: |
925 | ret = -EINVAL; |
926 | break; |
927 | } |
928 | |
929 | return ret; |
930 | } |
931 | |
932 | |
933 | #ifdef CONFIG_PCI |
934 | static int nonstatic_autoadd_resources(struct pcmcia_socket *s) |
935 | { |
936 | struct resource *res; |
937 | int i, done = 0; |
938 | |
939 | if (!s->cb_dev || !s->cb_dev->bus) |
940 | return -ENODEV; |
941 | |
942 | #if defined(CONFIG_X86) |
943 | /* If this is the root bus, the risk of hitting some strange |
944 | * system devices is too high: If a driver isn't loaded, the |
945 | * resources are not claimed; even if a driver is loaded, it |
946 | * may not request all resources or even the wrong one. We |
947 | * can neither trust the rest of the kernel nor ACPI/PNP and |
948 | * CRS parsing to get it right. Therefore, use several |
949 | * safeguards: |
950 | * |
951 | * - Do not auto-add resources if the CardBus bridge is on |
952 | * the PCI root bus |
953 | * |
954 | * - Avoid any I/O ports < 0x100. |
955 | * |
956 | * - On PCI-PCI bridges, only use resources which are set up |
957 | * exclusively for the secondary PCI bus: the risk of hitting |
958 | * system devices is quite low, as they usually aren't |
959 | * connected to the secondary PCI bus. |
960 | */ |
961 | if (s->cb_dev->bus->number == 0) |
962 | return -EINVAL; |
963 | |
964 | for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) { |
965 | res = s->cb_dev->bus->resource[i]; |
966 | #else |
967 | pci_bus_for_each_resource(s->cb_dev->bus, res, i) { |
968 | #endif |
969 | if (!res) |
970 | continue; |
971 | |
972 | if (res->flags & IORESOURCE_IO) { |
973 | /* safeguard against the root resource, where the |
974 | * risk of hitting any other device would be too |
975 | * high */ |
976 | if (res == &ioport_resource) |
977 | continue; |
978 | |
979 | dev_info(&s->cb_dev->dev, |
980 | "pcmcia: parent PCI bridge window: %pR\n" , |
981 | res); |
982 | if (!adjust_io(s, ADD_MANAGED_RESOURCE, start: res->start, end: res->end)) |
983 | done |= IORESOURCE_IO; |
984 | |
985 | } |
986 | |
987 | if (res->flags & IORESOURCE_MEM) { |
988 | /* safeguard against the root resource, where the |
989 | * risk of hitting any other device would be too |
990 | * high */ |
991 | if (res == &iomem_resource) |
992 | continue; |
993 | |
994 | dev_info(&s->cb_dev->dev, |
995 | "pcmcia: parent PCI bridge window: %pR\n" , |
996 | res); |
997 | if (!adjust_memory(s, ADD_MANAGED_RESOURCE, start: res->start, end: res->end)) |
998 | done |= IORESOURCE_MEM; |
999 | } |
1000 | } |
1001 | |
1002 | /* if we got at least one of IO, and one of MEM, we can be glad and |
1003 | * activate the PCMCIA subsystem */ |
1004 | if (done == (IORESOURCE_MEM | IORESOURCE_IO)) |
1005 | s->resource_setup_done = 1; |
1006 | |
1007 | return 0; |
1008 | } |
1009 | |
1010 | #else |
1011 | |
1012 | static inline int nonstatic_autoadd_resources(struct pcmcia_socket *s) |
1013 | { |
1014 | return -ENODEV; |
1015 | } |
1016 | |
1017 | #endif |
1018 | |
1019 | |
1020 | static int nonstatic_init(struct pcmcia_socket *s) |
1021 | { |
1022 | struct socket_data *data; |
1023 | |
1024 | data = kzalloc(size: sizeof(struct socket_data), GFP_KERNEL); |
1025 | if (!data) |
1026 | return -ENOMEM; |
1027 | |
1028 | data->mem_db.next = &data->mem_db; |
1029 | data->mem_db_valid.next = &data->mem_db_valid; |
1030 | data->io_db.next = &data->io_db; |
1031 | |
1032 | s->resource_data = (void *) data; |
1033 | |
1034 | nonstatic_autoadd_resources(s); |
1035 | |
1036 | return 0; |
1037 | } |
1038 | |
1039 | static void nonstatic_release_resource_db(struct pcmcia_socket *s) |
1040 | { |
1041 | struct socket_data *data = s->resource_data; |
1042 | struct resource_map *p, *q; |
1043 | |
1044 | for (p = data->mem_db_valid.next; p != &data->mem_db_valid; p = q) { |
1045 | q = p->next; |
1046 | kfree(objp: p); |
1047 | } |
1048 | for (p = data->mem_db.next; p != &data->mem_db; p = q) { |
1049 | q = p->next; |
1050 | kfree(objp: p); |
1051 | } |
1052 | for (p = data->io_db.next; p != &data->io_db; p = q) { |
1053 | q = p->next; |
1054 | kfree(objp: p); |
1055 | } |
1056 | |
1057 | kfree(objp: data); |
1058 | } |
1059 | |
1060 | |
1061 | struct pccard_resource_ops pccard_nonstatic_ops = { |
1062 | .validate_mem = pcmcia_nonstatic_validate_mem, |
1063 | .find_io = nonstatic_find_io, |
1064 | .find_mem = nonstatic_find_mem_region, |
1065 | .init = nonstatic_init, |
1066 | .exit = nonstatic_release_resource_db, |
1067 | }; |
1068 | EXPORT_SYMBOL(pccard_nonstatic_ops); |
1069 | |
1070 | |
1071 | /* sysfs interface to the resource database */ |
1072 | |
1073 | static ssize_t show_io_db(struct device *dev, |
1074 | struct device_attribute *attr, char *buf) |
1075 | { |
1076 | struct pcmcia_socket *s = dev_get_drvdata(dev); |
1077 | struct socket_data *data; |
1078 | struct resource_map *p; |
1079 | ssize_t ret = 0; |
1080 | |
1081 | mutex_lock(&s->ops_mutex); |
1082 | data = s->resource_data; |
1083 | |
1084 | for (p = data->io_db.next; p != &data->io_db; p = p->next) { |
1085 | if (ret > (PAGE_SIZE - 10)) |
1086 | continue; |
1087 | ret += sysfs_emit_at(buf, at: ret, |
1088 | fmt: "0x%08lx - 0x%08lx\n" , |
1089 | ((unsigned long) p->base), |
1090 | ((unsigned long) p->base + p->num - 1)); |
1091 | } |
1092 | |
1093 | mutex_unlock(lock: &s->ops_mutex); |
1094 | return ret; |
1095 | } |
1096 | |
1097 | static ssize_t store_io_db(struct device *dev, |
1098 | struct device_attribute *attr, |
1099 | const char *buf, size_t count) |
1100 | { |
1101 | struct pcmcia_socket *s = dev_get_drvdata(dev); |
1102 | unsigned long start_addr, end_addr; |
1103 | unsigned int add = ADD_MANAGED_RESOURCE; |
1104 | ssize_t ret = 0; |
1105 | |
1106 | ret = sscanf(buf, "+ 0x%lx - 0x%lx" , &start_addr, &end_addr); |
1107 | if (ret != 2) { |
1108 | ret = sscanf(buf, "- 0x%lx - 0x%lx" , &start_addr, &end_addr); |
1109 | add = REMOVE_MANAGED_RESOURCE; |
1110 | if (ret != 2) { |
1111 | ret = sscanf(buf, "0x%lx - 0x%lx" , &start_addr, |
1112 | &end_addr); |
1113 | add = ADD_MANAGED_RESOURCE; |
1114 | if (ret != 2) |
1115 | return -EINVAL; |
1116 | } |
1117 | } |
1118 | if (end_addr < start_addr) |
1119 | return -EINVAL; |
1120 | |
1121 | mutex_lock(&s->ops_mutex); |
1122 | ret = adjust_io(s, action: add, start: start_addr, end: end_addr); |
1123 | mutex_unlock(lock: &s->ops_mutex); |
1124 | |
1125 | return ret ? ret : count; |
1126 | } |
1127 | static DEVICE_ATTR(available_resources_io, 0600, show_io_db, store_io_db); |
1128 | |
1129 | static ssize_t show_mem_db(struct device *dev, |
1130 | struct device_attribute *attr, char *buf) |
1131 | { |
1132 | struct pcmcia_socket *s = dev_get_drvdata(dev); |
1133 | struct socket_data *data; |
1134 | struct resource_map *p; |
1135 | ssize_t ret = 0; |
1136 | |
1137 | mutex_lock(&s->ops_mutex); |
1138 | data = s->resource_data; |
1139 | |
1140 | for (p = data->mem_db_valid.next; p != &data->mem_db_valid; |
1141 | p = p->next) { |
1142 | if (ret > (PAGE_SIZE - 10)) |
1143 | continue; |
1144 | ret += sysfs_emit_at(buf, at: ret, |
1145 | fmt: "0x%08lx - 0x%08lx\n" , |
1146 | ((unsigned long) p->base), |
1147 | ((unsigned long) p->base + p->num - 1)); |
1148 | } |
1149 | |
1150 | for (p = data->mem_db.next; p != &data->mem_db; p = p->next) { |
1151 | if (ret > (PAGE_SIZE - 10)) |
1152 | continue; |
1153 | ret += sysfs_emit_at(buf, at: ret, |
1154 | fmt: "0x%08lx - 0x%08lx\n" , |
1155 | ((unsigned long) p->base), |
1156 | ((unsigned long) p->base + p->num - 1)); |
1157 | } |
1158 | |
1159 | mutex_unlock(lock: &s->ops_mutex); |
1160 | return ret; |
1161 | } |
1162 | |
1163 | static ssize_t store_mem_db(struct device *dev, |
1164 | struct device_attribute *attr, |
1165 | const char *buf, size_t count) |
1166 | { |
1167 | struct pcmcia_socket *s = dev_get_drvdata(dev); |
1168 | unsigned long start_addr, end_addr; |
1169 | unsigned int add = ADD_MANAGED_RESOURCE; |
1170 | ssize_t ret = 0; |
1171 | |
1172 | ret = sscanf(buf, "+ 0x%lx - 0x%lx" , &start_addr, &end_addr); |
1173 | if (ret != 2) { |
1174 | ret = sscanf(buf, "- 0x%lx - 0x%lx" , &start_addr, &end_addr); |
1175 | add = REMOVE_MANAGED_RESOURCE; |
1176 | if (ret != 2) { |
1177 | ret = sscanf(buf, "0x%lx - 0x%lx" , &start_addr, |
1178 | &end_addr); |
1179 | add = ADD_MANAGED_RESOURCE; |
1180 | if (ret != 2) |
1181 | return -EINVAL; |
1182 | } |
1183 | } |
1184 | if (end_addr < start_addr) |
1185 | return -EINVAL; |
1186 | |
1187 | mutex_lock(&s->ops_mutex); |
1188 | ret = adjust_memory(s, action: add, start: start_addr, end: end_addr); |
1189 | mutex_unlock(lock: &s->ops_mutex); |
1190 | |
1191 | return ret ? ret : count; |
1192 | } |
1193 | static DEVICE_ATTR(available_resources_mem, 0600, show_mem_db, store_mem_db); |
1194 | |
1195 | static struct attribute *pccard_rsrc_attributes[] = { |
1196 | &dev_attr_available_resources_io.attr, |
1197 | &dev_attr_available_resources_mem.attr, |
1198 | NULL, |
1199 | }; |
1200 | |
1201 | static const struct attribute_group rsrc_attributes = { |
1202 | .attrs = pccard_rsrc_attributes, |
1203 | }; |
1204 | |
1205 | static int pccard_sysfs_add_rsrc(struct device *dev) |
1206 | { |
1207 | struct pcmcia_socket *s = dev_get_drvdata(dev); |
1208 | |
1209 | if (s->resource_ops != &pccard_nonstatic_ops) |
1210 | return 0; |
1211 | return sysfs_create_group(kobj: &dev->kobj, grp: &rsrc_attributes); |
1212 | } |
1213 | |
1214 | static void pccard_sysfs_remove_rsrc(struct device *dev) |
1215 | { |
1216 | struct pcmcia_socket *s = dev_get_drvdata(dev); |
1217 | |
1218 | if (s->resource_ops != &pccard_nonstatic_ops) |
1219 | return; |
1220 | sysfs_remove_group(kobj: &dev->kobj, grp: &rsrc_attributes); |
1221 | } |
1222 | |
1223 | static struct class_interface pccard_rsrc_interface __refdata = { |
1224 | .class = &pcmcia_socket_class, |
1225 | .add_dev = &pccard_sysfs_add_rsrc, |
1226 | .remove_dev = &pccard_sysfs_remove_rsrc, |
1227 | }; |
1228 | |
1229 | static int __init nonstatic_sysfs_init(void) |
1230 | { |
1231 | return class_interface_register(&pccard_rsrc_interface); |
1232 | } |
1233 | |
1234 | static void __exit nonstatic_sysfs_exit(void) |
1235 | { |
1236 | class_interface_unregister(&pccard_rsrc_interface); |
1237 | } |
1238 | |
1239 | module_init(nonstatic_sysfs_init); |
1240 | module_exit(nonstatic_sysfs_exit); |
1241 | |