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 33MODULE_AUTHOR("David A. Hinds, Dominik Brodowski"); 34MODULE_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 41INT_MODULE_PARM(probe_mem, 1); /* memory probe? */ 42#ifdef CONFIG_PCMCIA_PROBE 43INT_MODULE_PARM(probe_io, 1); /* IO port probe? */ 44INT_MODULE_PARM(mem_limit, 0x10000); 45#endif 46 47/* for io_db and mem_db */ 48struct resource_map { 49 u_long base, num; 50 struct resource_map *next; 51}; 52 53struct 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 72static struct resource * 73claim_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(base, size, type | IORESOURCE_BUSY, name); 80 81 if (res) { 82#ifdef CONFIG_PCI 83 if (s && s->cb_dev) 84 parent = pci_find_parent_resource(s->cb_dev, res); 85#endif 86 if (!parent || request_resource(parent, res)) { 87 kfree(res); 88 res = NULL; 89 } 90 } 91 return res; 92} 93 94static void free_region(struct resource *res) 95{ 96 if (res) { 97 release_resource(res); 98 kfree(res); 99 } 100} 101 102/*====================================================================== 103 104 These manage the internal databases of available resources. 105 106======================================================================*/ 107 108static 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(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 132static 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(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(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 182static 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 */ 263static 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(res->start, s->map_size); 275 if (s->cis_virt) { 276 mutex_unlock(&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(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 */ 294static 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(res->start, 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(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(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 */ 344static 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/2, IORESOURCE_MEM, "PCMCIA memprobe"); 356 res2 = claim_region(s, base + size/2, size/2, IORESOURCE_MEM, 357 "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(res2); 371 free_region(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(&s_data->mem_db_valid, base, size); 379 sub_interval(&s_data->mem_db, base, 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 */ 400static 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, j, 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, j, step, 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(&s_data->mem_db, i, 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 */ 454static 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 */ 480static 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 */ 536static 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, mm.base, mm.num, readable, 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 */ 563static 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 583struct pcmcia_align_data { 584 unsigned long mask; 585 unsigned long offset; 586 struct resource_map *map; 587}; 588 589static 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 602static resource_size_t 603pcmcia_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(data, 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(data, 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 */ 648static 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 682static 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(0, num, IORESOURCE_IO, 687 dev_name(&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(s->cb_dev->bus, res, num, 1, 703 min, 0, pcmcia_align, &data); 704 } else 705#endif 706 ret = allocate_resource(&ioport_resource, res, num, min, ~0UL, 707 1, pcmcia_align, &data); 708 709 if (ret != 0) { 710 kfree(res); 711 res = NULL; 712 } 713 return res; 714} 715 716static 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, 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, res->start, 768 res->end + num); 769 if (!ret) { 770 ret = adjust_resource(s->io[i].res, res->start, 771 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 res->start - num, 786 res->end); 787 if (!ret) { 788 ret = adjust_resource(s->io[i].res, 789 res->start - num, 790 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 805static 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(0, num, IORESOURCE_MEM, 809 dev_name(&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(s->cb_dev->bus, 837 res, num, 1, min, 0, 838 pcmcia_align, &data); 839 } else 840#endif 841 { 842 ret = allocate_resource(&iomem_resource, 843 res, num, min, max, 1, 844 pcmcia_align, &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(res); 857 res = NULL; 858 } 859 return res; 860} 861 862 863static 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(&data->mem_db, start, size); 875 if (!ret) 876 do_mem_probe(s, start, size, NULL, NULL); 877 break; 878 case REMOVE_MANAGED_RESOURCE: 879 ret = sub_interval(&data->mem_db, start, size); 880 break; 881 default: 882 ret = -EINVAL; 883 } 884 885 return ret; 886} 887 888 889static 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(&data->io_db, start, 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(&data->io_db, start, size); 923 break; 924 default: 925 ret = -EINVAL; 926 break; 927 } 928 929 return ret; 930} 931 932 933#ifdef CONFIG_PCI 934static 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, res->start, 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, res->start, 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 1012static inline int nonstatic_autoadd_resources(struct pcmcia_socket *s) 1013{ 1014 return -ENODEV; 1015} 1016 1017#endif 1018 1019 1020static int nonstatic_init(struct pcmcia_socket *s) 1021{ 1022 struct socket_data *data; 1023 1024 data = kzalloc(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 1039static 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(p); 1047 } 1048 for (p = data->mem_db.next; p != &data->mem_db; p = q) { 1049 q = p->next; 1050 kfree(p); 1051 } 1052 for (p = data->io_db.next; p != &data->io_db; p = q) { 1053 q = p->next; 1054 kfree(p); 1055 } 1056 1057 kfree(data); 1058} 1059 1060 1061struct 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}; 1068EXPORT_SYMBOL(pccard_nonstatic_ops); 1069 1070 1071/* sysfs interface to the resource database */ 1072 1073static 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, ret, 1088 "0x%08lx - 0x%08lx\n", 1089 ((unsigned long) p->base), 1090 ((unsigned long) p->base + p->num - 1)); 1091 } 1092 1093 mutex_unlock(&s->ops_mutex); 1094 return ret; 1095} 1096 1097static 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, add, start_addr, end_addr); 1123 mutex_unlock(&s->ops_mutex); 1124 1125 return ret ? ret : count; 1126} 1127static DEVICE_ATTR(available_resources_io, 0600, show_io_db, store_io_db); 1128 1129static 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, ret, 1145 "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, ret, 1154 "0x%08lx - 0x%08lx\n", 1155 ((unsigned long) p->base), 1156 ((unsigned long) p->base + p->num - 1)); 1157 } 1158 1159 mutex_unlock(&s->ops_mutex); 1160 return ret; 1161} 1162 1163static 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, add, start_addr, end_addr); 1189 mutex_unlock(&s->ops_mutex); 1190 1191 return ret ? ret : count; 1192} 1193static DEVICE_ATTR(available_resources_mem, 0600, show_mem_db, store_mem_db); 1194 1195static struct attribute *pccard_rsrc_attributes[] = { 1196 &dev_attr_available_resources_io.attr, 1197 &dev_attr_available_resources_mem.attr, 1198 NULL, 1199}; 1200 1201static const struct attribute_group rsrc_attributes = { 1202 .attrs = pccard_rsrc_attributes, 1203}; 1204 1205static 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(&dev->kobj, &rsrc_attributes); 1212} 1213 1214static 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(&dev->kobj, &rsrc_attributes); 1221} 1222 1223static 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 1229static int __init nonstatic_sysfs_init(void) 1230{ 1231 return class_interface_register(&pccard_rsrc_interface); 1232} 1233 1234static void __exit nonstatic_sysfs_exit(void) 1235{ 1236 class_interface_unregister(&pccard_rsrc_interface); 1237} 1238 1239module_init(nonstatic_sysfs_init); 1240module_exit(nonstatic_sysfs_exit); 1241