git.oblomov.eu Git - linux-2.6/blob - drivers/ieee1394/highlevel.c

   1 /*
   2  * IEEE 1394 for Linux
   3  *
   4  * Copyright (C) 1999 Andreas E. Bombe
   5  *
   6  * This code is licensed under the GPL.  See the file COPYING in the root
   7  * directory of the kernel sources for details.
   8  *
   9  *
  10  * Contributions:
  11  *
  12  * Christian Toegel <christian.toegel@gmx.at>
  13  *        unregister address space
  14  *
  15  * Manfred Weihs <weihs@ict.tuwien.ac.at>
  16  *        unregister address space
  17  *
  18  */
  19
  20 #include <linux/slab.h>
  21 #include <linux/list.h>
  22 #include <linux/bitops.h>
  23
  24 #include "ieee1394.h"
  25 #include "ieee1394_types.h"
  26 #include "hosts.h"
  27 #include "ieee1394_core.h"
  28 #include "highlevel.h"
  29 #include "nodemgr.h"
  30
  31
  32 struct hl_host_info {
  33         struct list_head list;
  34         struct hpsb_host *host;
  35         size_t size;
  36         unsigned long key;
  37         void *data;
  38 };
  39
  40
  41 static LIST_HEAD(hl_drivers);
  42 static DECLARE_RWSEM(hl_drivers_sem);
  43
  44 static LIST_HEAD(hl_irqs);
  45 static DEFINE_RWLOCK(hl_irqs_lock);
  46
  47 static DEFINE_RWLOCK(addr_space_lock);
  48
  49 /* addr_space list will have zero and max already included as bounds */
  50 static struct hpsb_address_ops dummy_ops = { NULL, NULL, NULL, NULL };
  51 static struct hpsb_address_serve dummy_zero_addr, dummy_max_addr;
  52
  53
  54 static struct hl_host_info *hl_get_hostinfo(struct hpsb_highlevel *hl,
  55                                             struct hpsb_host *host)
  56 {
  57         struct hl_host_info *hi = NULL;
  58
  59         if (!hl || !host)
  60                 return NULL;
  61
  62         read_lock(&hl->host_info_lock);
  63         list_for_each_entry(hi, &hl->host_info_list, list) {
  64                 if (hi->host == host) {
  65                         read_unlock(&hl->host_info_lock);
  66                         return hi;
  67                 }
  68         }
  69         read_unlock(&hl->host_info_lock);
  70         return NULL;
  71 }
  72
  73 /* Returns a per host/driver data structure that was previously stored by
  74  * hpsb_create_hostinfo. */
  75 void *hpsb_get_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host)
  76 {
  77         struct hl_host_info *hi = hl_get_hostinfo(hl, host);
  78
  79         return hi ? hi->data : NULL;
  80 }
  81
  82 /* If size is zero, then the return here is only valid for error checking */
  83 void *hpsb_create_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host,
  84                            size_t data_size)
  85 {
  86         struct hl_host_info *hi;
  87         void *data;
  88         unsigned long flags;
  89
  90         hi = hl_get_hostinfo(hl, host);
  91         if (hi) {
  92                 HPSB_ERR("%s called hpsb_create_hostinfo when hostinfo already"
  93                          " exists", hl->name);
  94                 return NULL;
  95         }
  96
  97         hi = kzalloc(sizeof(*hi) + data_size, GFP_ATOMIC);
  98         if (!hi)
  99                 return NULL;
 100
 101         if (data_size) {
 102                 data = hi->data = hi + 1;
 103                 hi->size = data_size;
 104         } else
 105                 data = hi;
 106
 107         hi->host = host;
 108
 109         write_lock_irqsave(&hl->host_info_lock, flags);
 110         list_add_tail(&hi->list, &hl->host_info_list);
 111         write_unlock_irqrestore(&hl->host_info_lock, flags);
 112
 113         return data;
 114 }
 115
 116 int hpsb_set_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host,
 117                       void *data)
 118 {
 119         struct hl_host_info *hi;
 120
 121         hi = hl_get_hostinfo(hl, host);
 122         if (hi) {
 123                 if (!hi->size && !hi->data) {
 124                         hi->data = data;
 125                         return 0;
 126                 } else
 127                         HPSB_ERR("%s called hpsb_set_hostinfo when hostinfo "
 128                                  "already has data", hl->name);
 129         } else
 130                 HPSB_ERR("%s called hpsb_set_hostinfo when no hostinfo exists",
 131                          hl->name);
 132         return -EINVAL;
 133 }
 134
 135 void hpsb_destroy_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host)
 136 {
 137         struct hl_host_info *hi;
 138
 139         hi = hl_get_hostinfo(hl, host);
 140         if (hi) {
 141                 unsigned long flags;
 142                 write_lock_irqsave(&hl->host_info_lock, flags);
 143                 list_del(&hi->list);
 144                 write_unlock_irqrestore(&hl->host_info_lock, flags);
 145                 kfree(hi);
 146         }
 147         return;
 148 }
 149
 150 void hpsb_set_hostinfo_key(struct hpsb_highlevel *hl, struct hpsb_host *host,
 151                            unsigned long key)
 152 {
 153         struct hl_host_info *hi;
 154
 155         hi = hl_get_hostinfo(hl, host);
 156         if (hi)
 157                 hi->key = key;
 158         return;
 159 }
 160
 161 void *hpsb_get_hostinfo_bykey(struct hpsb_highlevel *hl, unsigned long key)
 162 {
 163         struct hl_host_info *hi;
 164         void *data = NULL;
 165
 166         if (!hl)
 167                 return NULL;
 168
 169         read_lock(&hl->host_info_lock);
 170         list_for_each_entry(hi, &hl->host_info_list, list) {
 171                 if (hi->key == key) {
 172                         data = hi->data;
 173                         break;
 174                 }
 175         }
 176         read_unlock(&hl->host_info_lock);
 177         return data;
 178 }
 179
 180 static int highlevel_for_each_host_reg(struct hpsb_host *host, void *__data)
 181 {
 182         struct hpsb_highlevel *hl = __data;
 183
 184         hl->add_host(host);
 185
 186         if (host->update_config_rom && hpsb_update_config_rom_image(host) < 0)
 187                 HPSB_ERR("Failed to generate Configuration ROM image for host "
 188                          "%s-%d", hl->name, host->id);
 189         return 0;
 190 }
 191
 192 void hpsb_register_highlevel(struct hpsb_highlevel *hl)
 193 {
 194         unsigned long flags;
 195
 196         INIT_LIST_HEAD(&hl->addr_list);
 197         INIT_LIST_HEAD(&hl->host_info_list);
 198
 199         rwlock_init(&hl->host_info_lock);
 200
 201         down_write(&hl_drivers_sem);
 202         list_add_tail(&hl->hl_list, &hl_drivers);
 203         up_write(&hl_drivers_sem);
 204
 205         write_lock_irqsave(&hl_irqs_lock, flags);
 206         list_add_tail(&hl->irq_list, &hl_irqs);
 207         write_unlock_irqrestore(&hl_irqs_lock, flags);
 208
 209         if (hl->add_host)
 210                 nodemgr_for_each_host(hl, highlevel_for_each_host_reg);
 211         return;
 212 }
 213
 214 static void __delete_addr(struct hpsb_address_serve *as)
 215 {
 216         list_del(&as->host_list);
 217         list_del(&as->hl_list);
 218         kfree(as);
 219 }
 220
 221 static void __unregister_host(struct hpsb_highlevel *hl, struct hpsb_host *host,
 222                               int update_cr)
 223 {
 224         unsigned long flags;
 225         struct list_head *lh, *next;
 226         struct hpsb_address_serve *as;
 227
 228         /* First, let the highlevel driver unreg */
 229         if (hl->remove_host)
 230                 hl->remove_host(host);
 231
 232         /* Remove any addresses that are matched for this highlevel driver
 233          * and this particular host. */
 234         write_lock_irqsave(&addr_space_lock, flags);
 235         list_for_each_safe (lh, next, &hl->addr_list) {
 236                 as = list_entry(lh, struct hpsb_address_serve, hl_list);
 237                 if (as->host == host)
 238                         __delete_addr(as);
 239         }
 240         write_unlock_irqrestore(&addr_space_lock, flags);
 241
 242         /* Now update the config-rom to reflect anything removed by the
 243          * highlevel driver. */
 244         if (update_cr && host->update_config_rom &&
 245             hpsb_update_config_rom_image(host) < 0)
 246                 HPSB_ERR("Failed to generate Configuration ROM image for host "
 247                          "%s-%d", hl->name, host->id);
 248
 249         /* Finally remove all the host info associated between these two. */
 250         hpsb_destroy_hostinfo(hl, host);
 251 }
 252
 253 static int highlevel_for_each_host_unreg(struct hpsb_host *host, void *__data)
 254 {
 255         struct hpsb_highlevel *hl = __data;
 256
 257         __unregister_host(hl, host, 1);
 258         return 0;
 259 }
 260
 261 void hpsb_unregister_highlevel(struct hpsb_highlevel *hl)
 262 {
 263         unsigned long flags;
 264
 265         write_lock_irqsave(&hl_irqs_lock, flags);
 266         list_del(&hl->irq_list);
 267         write_unlock_irqrestore(&hl_irqs_lock, flags);
 268
 269         down_write(&hl_drivers_sem);
 270         list_del(&hl->hl_list);
 271         up_write(&hl_drivers_sem);
 272
 273         nodemgr_for_each_host(hl, highlevel_for_each_host_unreg);
 274 }
 275
 276 u64 hpsb_allocate_and_register_addrspace(struct hpsb_highlevel *hl,
 277                                          struct hpsb_host *host,
 278                                          struct hpsb_address_ops *ops,
 279                                          u64 size, u64 alignment,
 280                                          u64 start, u64 end)
 281 {
 282         struct hpsb_address_serve *as, *a1, *a2;
 283         struct list_head *entry;
 284         u64 retval = CSR1212_INVALID_ADDR_SPACE;
 285         unsigned long flags;
 286         u64 align_mask = ~(alignment - 1);
 287
 288         if ((alignment & 3) || (alignment > 0x800000000000ULL) ||
 289             (hweight64(alignment) != 1)) {
 290                 HPSB_ERR("%s called with invalid alignment: 0x%048llx",
 291                          __FUNCTION__, (unsigned long long)alignment);
 292                 return retval;
 293         }
 294
 295         /* default range,
 296          * avoids controller's posted write area (see OHCI 1.1 clause 1.5) */
 297         if (start == CSR1212_INVALID_ADDR_SPACE &&
 298             end   == CSR1212_INVALID_ADDR_SPACE) {
 299                 start = host->middle_addr_space;
 300                 end   = CSR1212_ALL_SPACE_END;
 301         }
 302
 303         if (((start|end) & ~align_mask) || (start >= end) ||
 304             (end > CSR1212_ALL_SPACE_END)) {
 305                 HPSB_ERR("%s called with invalid addresses "
 306                          "(start = %012Lx  end = %012Lx)", __FUNCTION__,
 307                          (unsigned long long)start,(unsigned long long)end);
 308                 return retval;
 309         }
 310
 311         as = kmalloc(sizeof(*as), GFP_KERNEL);
 312         if (!as)
 313                 return retval;
 314
 315         INIT_LIST_HEAD(&as->host_list);
 316         INIT_LIST_HEAD(&as->hl_list);
 317         as->op = ops;
 318         as->host = host;
 319
 320         write_lock_irqsave(&addr_space_lock, flags);
 321         list_for_each(entry, &host->addr_space) {
 322                 u64 a1sa, a1ea;
 323                 u64 a2sa, a2ea;
 324
 325                 a1 = list_entry(entry, struct hpsb_address_serve, host_list);
 326                 a2 = list_entry(entry->next, struct hpsb_address_serve,
 327                                 host_list);
 328
 329                 a1sa = a1->start & align_mask;
 330                 a1ea = (a1->end + alignment -1) & align_mask;
 331                 a2sa = a2->start & align_mask;
 332                 a2ea = (a2->end + alignment -1) & align_mask;
 333
 334                 if ((a2sa - a1ea >= size) && (a2sa - start >= size) &&
 335                     (a2sa > start)) {
 336                         as->start = max(start, a1ea);
 337                         as->end = as->start + size;
 338                         list_add(&as->host_list, entry);
 339                         list_add_tail(&as->hl_list, &hl->addr_list);
 340                         retval = as->start;
 341                         break;
 342                 }
 343         }
 344         write_unlock_irqrestore(&addr_space_lock, flags);
 345
 346         if (retval == CSR1212_INVALID_ADDR_SPACE)
 347                 kfree(as);
 348         return retval;
 349 }
 350
 351 int hpsb_register_addrspace(struct hpsb_highlevel *hl, struct hpsb_host *host,
 352                             struct hpsb_address_ops *ops, u64 start, u64 end)
 353 {
 354         struct hpsb_address_serve *as;
 355         struct list_head *lh;
 356         int retval = 0;
 357         unsigned long flags;
 358
 359         if (((start|end) & 3) || (start >= end) ||
 360             (end > CSR1212_ALL_SPACE_END)) {
 361                 HPSB_ERR("%s called with invalid addresses", __FUNCTION__);
 362                 return 0;
 363         }
 364
 365         as = kmalloc(sizeof(*as), GFP_ATOMIC);
 366         if (!as)
 367                 return 0;
 368
 369         INIT_LIST_HEAD(&as->host_list);
 370         INIT_LIST_HEAD(&as->hl_list);
 371         as->op = ops;
 372         as->start = start;
 373         as->end = end;
 374         as->host = host;
 375
 376         write_lock_irqsave(&addr_space_lock, flags);
 377         list_for_each(lh, &host->addr_space) {
 378                 struct hpsb_address_serve *as_this =
 379                         list_entry(lh, struct hpsb_address_serve, host_list);
 380                 struct hpsb_address_serve *as_next =
 381                         list_entry(lh->next, struct hpsb_address_serve,
 382                                    host_list);
 383
 384                 if (as_this->end > as->start)
 385                         break;
 386
 387                 if (as_next->start >= as->end) {
 388                         list_add(&as->host_list, lh);
 389                         list_add_tail(&as->hl_list, &hl->addr_list);
 390                         retval = 1;
 391                         break;
 392                 }
 393         }
 394         write_unlock_irqrestore(&addr_space_lock, flags);
 395
 396         if (retval == 0)
 397                 kfree(as);
 398         return retval;
 399 }
 400
 401 int hpsb_unregister_addrspace(struct hpsb_highlevel *hl, struct hpsb_host *host,
 402                               u64 start)
 403 {
 404         int retval = 0;
 405         struct hpsb_address_serve *as;
 406         struct list_head *lh, *next;
 407         unsigned long flags;
 408
 409         write_lock_irqsave(&addr_space_lock, flags);
 410         list_for_each_safe (lh, next, &hl->addr_list) {
 411                 as = list_entry(lh, struct hpsb_address_serve, hl_list);
 412                 if (as->start == start && as->host == host) {
 413                         __delete_addr(as);
 414                         retval = 1;
 415                         break;
 416                 }
 417         }
 418         write_unlock_irqrestore(&addr_space_lock, flags);
 419         return retval;
 420 }
 421
 422 int hpsb_listen_channel(struct hpsb_highlevel *hl, struct hpsb_host *host,
 423                         unsigned int channel)
 424 {
 425         if (channel > 63) {
 426                 HPSB_ERR("%s called with invalid channel", __FUNCTION__);
 427                 return -EINVAL;
 428         }
 429         if (host->iso_listen_count[channel]++ == 0)
 430                 return host->driver->devctl(host, ISO_LISTEN_CHANNEL, channel);
 431         return 0;
 432 }
 433
 434 void hpsb_unlisten_channel(struct hpsb_highlevel *hl, struct hpsb_host *host,
 435                            unsigned int channel)
 436 {
 437         if (channel > 63) {
 438                 HPSB_ERR("%s called with invalid channel", __FUNCTION__);
 439                 return;
 440         }
 441         if (--host->iso_listen_count[channel] == 0)
 442                 host->driver->devctl(host, ISO_UNLISTEN_CHANNEL, channel);
 443 }
 444
 445 static void init_hpsb_highlevel(struct hpsb_host *host)
 446 {
 447         INIT_LIST_HEAD(&dummy_zero_addr.host_list);
 448         INIT_LIST_HEAD(&dummy_zero_addr.hl_list);
 449         INIT_LIST_HEAD(&dummy_max_addr.host_list);
 450         INIT_LIST_HEAD(&dummy_max_addr.hl_list);
 451
 452         dummy_zero_addr.op = dummy_max_addr.op = &dummy_ops;
 453
 454         dummy_zero_addr.start = dummy_zero_addr.end = 0;
 455         dummy_max_addr.start = dummy_max_addr.end = ((u64) 1) << 48;
 456
 457         list_add_tail(&dummy_zero_addr.host_list, &host->addr_space);
 458         list_add_tail(&dummy_max_addr.host_list, &host->addr_space);
 459 }
 460
 461 void highlevel_add_host(struct hpsb_host *host)
 462 {
 463         struct hpsb_highlevel *hl;
 464
 465         init_hpsb_highlevel(host);
 466
 467         down_read(&hl_drivers_sem);
 468         list_for_each_entry(hl, &hl_drivers, hl_list) {
 469                 if (hl->add_host)
 470                         hl->add_host(host);
 471         }
 472         up_read(&hl_drivers_sem);
 473         if (host->update_config_rom && hpsb_update_config_rom_image(host) < 0)
 474                 HPSB_ERR("Failed to generate Configuration ROM image for host "
 475                          "%s-%d", hl->name, host->id);
 476 }
 477
 478 void highlevel_remove_host(struct hpsb_host *host)
 479 {
 480         struct hpsb_highlevel *hl;
 481
 482         down_read(&hl_drivers_sem);
 483         list_for_each_entry(hl, &hl_drivers, hl_list)
 484                 __unregister_host(hl, host, 0);
 485         up_read(&hl_drivers_sem);
 486 }
 487
 488 void highlevel_host_reset(struct hpsb_host *host)
 489 {
 490         unsigned long flags;
 491         struct hpsb_highlevel *hl;
 492
 493         read_lock_irqsave(&hl_irqs_lock, flags);
 494         list_for_each_entry(hl, &hl_irqs, irq_list) {
 495                 if (hl->host_reset)
 496                         hl->host_reset(host);
 497         }
 498         read_unlock_irqrestore(&hl_irqs_lock, flags);
 499 }
 500
 501 void highlevel_iso_receive(struct hpsb_host *host, void *data, size_t length)
 502 {
 503         unsigned long flags;
 504         struct hpsb_highlevel *hl;
 505         int channel = (((quadlet_t *)data)[0] >> 8) & 0x3f;
 506
 507         read_lock_irqsave(&hl_irqs_lock, flags);
 508         list_for_each_entry(hl, &hl_irqs, irq_list) {
 509                 if (hl->iso_receive)
 510                         hl->iso_receive(host, channel, data, length);
 511         }
 512         read_unlock_irqrestore(&hl_irqs_lock, flags);
 513 }
 514
 515 void highlevel_fcp_request(struct hpsb_host *host, int nodeid, int direction,
 516                            void *data, size_t length)
 517 {
 518         unsigned long flags;
 519         struct hpsb_highlevel *hl;
 520         int cts = ((quadlet_t *)data)[0] >> 4;
 521
 522         read_lock_irqsave(&hl_irqs_lock, flags);
 523         list_for_each_entry(hl, &hl_irqs, irq_list) {
 524                 if (hl->fcp_request)
 525                         hl->fcp_request(host, nodeid, direction, cts, data,
 526                                         length);
 527         }
 528         read_unlock_irqrestore(&hl_irqs_lock, flags);
 529 }
 530
 531 int highlevel_read(struct hpsb_host *host, int nodeid, void *data, u64 addr,
 532                    unsigned int length, u16 flags)
 533 {
 534         struct hpsb_address_serve *as;
 535         unsigned int partlength;
 536         int rcode = RCODE_ADDRESS_ERROR;
 537
 538         read_lock(&addr_space_lock);
 539         list_for_each_entry(as, &host->addr_space, host_list) {
 540                 if (as->start > addr)
 541                         break;
 542
 543                 if (as->end > addr) {
 544                         partlength = min(as->end - addr, (u64) length);
 545
 546                         if (as->op->read)
 547                                 rcode = as->op->read(host, nodeid, data,
 548                                                      addr, partlength, flags);
 549                         else
 550                                 rcode = RCODE_TYPE_ERROR;
 551
 552                         data += partlength;
 553                         length -= partlength;
 554                         addr += partlength;
 555
 556                         if ((rcode != RCODE_COMPLETE) || !length)
 557                                 break;
 558                 }
 559         }
 560         read_unlock(&addr_space_lock);
 561
 562         if (length && (rcode == RCODE_COMPLETE))
 563                 rcode = RCODE_ADDRESS_ERROR;
 564         return rcode;
 565 }
 566
 567 int highlevel_write(struct hpsb_host *host, int nodeid, int destid, void *data,
 568                     u64 addr, unsigned int length, u16 flags)
 569 {
 570         struct hpsb_address_serve *as;
 571         unsigned int partlength;
 572         int rcode = RCODE_ADDRESS_ERROR;
 573
 574         read_lock(&addr_space_lock);
 575         list_for_each_entry(as, &host->addr_space, host_list) {
 576                 if (as->start > addr)
 577                         break;
 578
 579                 if (as->end > addr) {
 580                         partlength = min(as->end - addr, (u64) length);
 581
 582                         if (as->op->write)
 583                                 rcode = as->op->write(host, nodeid, destid,
 584                                                       data, addr, partlength,
 585                                                       flags);
 586                         else
 587                                 rcode = RCODE_TYPE_ERROR;
 588
 589                         data += partlength;
 590                         length -= partlength;
 591                         addr += partlength;
 592
 593                         if ((rcode != RCODE_COMPLETE) || !length)
 594                                 break;
 595                 }
 596         }
 597         read_unlock(&addr_space_lock);
 598
 599         if (length && (rcode == RCODE_COMPLETE))
 600                 rcode = RCODE_ADDRESS_ERROR;
 601         return rcode;
 602 }
 603
 604 int highlevel_lock(struct hpsb_host *host, int nodeid, quadlet_t *store,
 605                    u64 addr, quadlet_t data, quadlet_t arg, int ext_tcode,
 606                    u16 flags)
 607 {
 608         struct hpsb_address_serve *as;
 609         int rcode = RCODE_ADDRESS_ERROR;
 610
 611         read_lock(&addr_space_lock);
 612         list_for_each_entry(as, &host->addr_space, host_list) {
 613                 if (as->start > addr)
 614                         break;
 615
 616                 if (as->end > addr) {
 617                         if (as->op->lock)
 618                                 rcode = as->op->lock(host, nodeid, store, addr,
 619                                                      data, arg, ext_tcode,
 620                                                      flags);
 621                         else
 622                                 rcode = RCODE_TYPE_ERROR;
 623                         break;
 624                 }
 625         }
 626         read_unlock(&addr_space_lock);
 627         return rcode;
 628 }
 629
 630 int highlevel_lock64(struct hpsb_host *host, int nodeid, octlet_t *store,
 631                      u64 addr, octlet_t data, octlet_t arg, int ext_tcode,
 632                      u16 flags)
 633 {
 634         struct hpsb_address_serve *as;
 635         int rcode = RCODE_ADDRESS_ERROR;
 636
 637         read_lock(&addr_space_lock);
 638
 639         list_for_each_entry(as, &host->addr_space, host_list) {
 640                 if (as->start > addr)
 641                         break;
 642
 643                 if (as->end > addr) {
 644                         if (as->op->lock64)
 645                                 rcode = as->op->lock64(host, nodeid, store,
 646                                                        addr, data, arg,
 647                                                        ext_tcode, flags);
 648                         else
 649                                 rcode = RCODE_TYPE_ERROR;
 650                         break;
 651                 }
 652         }
 653         read_unlock(&addr_space_lock);
 654         return rcode;
 655 }