drivers/pcmcia/rsrc_nonstatic.c

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