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/config.h>
  21 #include <linux/slab.h>
  22 #include <linux/list.h>
  23 #include <linux/bitops.h>
  24
  25 #include "ieee1394.h"
  26 #include "ieee1394_types.h"
  27 #include "hosts.h"
  28 #include "ieee1394_core.h"
  29 #include "highlevel.h"
  30 #include "nodemgr.h"
  31
  32
  33 struct hl_host_info {
  34         struct list_head list;
  35         struct hpsb_host *host;
  36         size_t size;
  37         unsigned long key;
  38         void *data;
  39 };
  40
  41
  42 static LIST_HEAD(hl_drivers);
  43 static DECLARE_RWSEM(hl_drivers_sem);
  44
  45 static LIST_HEAD(hl_irqs);
  46 static DEFINE_RWLOCK(hl_irqs_lock);
  47
  48 static DEFINE_RWLOCK(addr_space_lock);
  49
  50 /* addr_space list will have zero and max already included as bounds */
  51 static struct hpsb_address_ops dummy_ops = { NULL, NULL, NULL, NULL };
  52 static struct hpsb_address_serve dummy_zero_addr, dummy_max_addr;
  53
  54
  55 static struct hl_host_info *hl_get_hostinfo(struct hpsb_highlevel *hl,
  56                                               struct hpsb_host *host)
  57 {
  58         struct hl_host_info *hi = NULL;
  59
  60         if (!hl || !host)
  61                 return NULL;
  62
  63         read_lock(&hl->host_info_lock);
  64         list_for_each_entry(hi, &hl->host_info_list, list) {
  65                 if (hi->host == host) {
  66                         read_unlock(&hl->host_info_lock);
  67                         return hi;
  68                 }
  69         }
  70         read_unlock(&hl->host_info_lock);
  71
  72         return NULL;
  73 }
  74
  75
  76 /* Returns a per host/driver data structure that was previously stored by
  77  * hpsb_create_hostinfo. */
  78 void *hpsb_get_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host)
  79 {
  80         struct hl_host_info *hi = hl_get_hostinfo(hl, host);
  81
  82         if (hi)
  83                 return hi->data;
  84
  85         return NULL;
  86 }
  87
  88
  89 /* If size is zero, then the return here is only valid for error checking */
  90 void *hpsb_create_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host,
  91                            size_t data_size)
  92 {
  93         struct hl_host_info *hi;
  94         void *data;
  95         unsigned long flags;
  96
  97         hi = hl_get_hostinfo(hl, host);
  98         if (hi) {
  99                 HPSB_ERR("%s called hpsb_create_hostinfo when hostinfo already exists",
 100                          hl->name);
 101                 return NULL;
 102         }
 103
 104         hi = kmalloc(sizeof(*hi) + data_size, GFP_ATOMIC);
 105         if (!hi)
 106                 return NULL;
 107
 108         memset(hi, 0, sizeof(*hi) + data_size);
 109
 110         if (data_size) {
 111                 data = hi->data = hi + 1;
 112                 hi->size = data_size;
 113         } else
 114                 data = hi;
 115
 116         hi->host = host;
 117
 118         write_lock_irqsave(&hl->host_info_lock, flags);
 119         list_add_tail(&hi->list, &hl->host_info_list);
 120         write_unlock_irqrestore(&hl->host_info_lock, flags);
 121
 122         return data;
 123 }
 124
 125
 126 int hpsb_set_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host,
 127                       void *data)
 128 {
 129         struct hl_host_info *hi;
 130
 131         hi = hl_get_hostinfo(hl, host);
 132         if (hi) {
 133                 if (!hi->size && !hi->data) {
 134                         hi->data = data;
 135                         return 0;
 136                 } else
 137                         HPSB_ERR("%s called hpsb_set_hostinfo when hostinfo already has data",
 138                                  hl->name);
 139         } else
 140                 HPSB_ERR("%s called hpsb_set_hostinfo when no hostinfo exists",
 141                          hl->name);
 142
 143         return -EINVAL;
 144 }
 145
 146
 147 void hpsb_destroy_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host)
 148 {
 149         struct hl_host_info *hi;
 150
 151         hi = hl_get_hostinfo(hl, host);
 152         if (hi) {
 153                 unsigned long flags;
 154                 write_lock_irqsave(&hl->host_info_lock, flags);
 155                 list_del(&hi->list);
 156                 write_unlock_irqrestore(&hl->host_info_lock, flags);
 157                 kfree(hi);
 158         }
 159
 160         return;
 161 }
 162
 163
 164 void hpsb_set_hostinfo_key(struct hpsb_highlevel *hl, struct hpsb_host *host, unsigned long key)
 165 {
 166         struct hl_host_info *hi;
 167
 168         hi = hl_get_hostinfo(hl, host);
 169         if (hi)
 170                 hi->key = key;
 171
 172         return;
 173 }
 174
 175
 176 void *hpsb_get_hostinfo_bykey(struct hpsb_highlevel *hl, unsigned long key)
 177 {
 178         struct hl_host_info *hi;
 179         void *data = NULL;
 180
 181         if (!hl)
 182                 return NULL;
 183
 184         read_lock(&hl->host_info_lock);
 185         list_for_each_entry(hi, &hl->host_info_list, list) {
 186                 if (hi->key == key) {
 187                         data = hi->data;
 188                         break;
 189                 }
 190         }
 191         read_unlock(&hl->host_info_lock);
 192
 193         return data;
 194 }
 195
 196
 197 static int highlevel_for_each_host_reg(struct hpsb_host *host, void *__data)
 198 {
 199         struct hpsb_highlevel *hl = __data;
 200
 201         hl->add_host(host);
 202
 203         if (host->update_config_rom) {
 204                 if (hpsb_update_config_rom_image(host) < 0) {
 205                         HPSB_ERR("Failed to generate Configuration ROM image for host "
 206                                  "%s-%d", hl->name, host->id);
 207                 }
 208         }
 209
 210         return 0;
 211 }
 212
 213 void hpsb_register_highlevel(struct hpsb_highlevel *hl)
 214 {
 215         INIT_LIST_HEAD(&hl->addr_list);
 216         INIT_LIST_HEAD(&hl->host_info_list);
 217
 218         rwlock_init(&hl->host_info_lock);
 219
 220         down_write(&hl_drivers_sem);
 221         list_add_tail(&hl->hl_list, &hl_drivers);
 222         up_write(&hl_drivers_sem);
 223
 224         write_lock(&hl_irqs_lock);
 225         list_add_tail(&hl->irq_list, &hl_irqs);
 226         write_unlock(&hl_irqs_lock);
 227
 228         if (hl->add_host)
 229                 nodemgr_for_each_host(hl, highlevel_for_each_host_reg);
 230
 231         return;
 232 }
 233
 234 static void __delete_addr(struct hpsb_address_serve *as)
 235 {
 236         list_del(&as->host_list);
 237         list_del(&as->hl_list);
 238         kfree(as);
 239 }
 240
 241 static void __unregister_host(struct hpsb_highlevel *hl, struct hpsb_host *host, int update_cr)
 242 {
 243         unsigned long flags;
 244         struct list_head *lh, *next;
 245         struct hpsb_address_serve *as;
 246
 247         /* First, let the highlevel driver unreg */
 248         if (hl->remove_host)
 249                 hl->remove_host(host);
 250
 251         /* Remove any addresses that are matched for this highlevel driver
 252          * and this particular host. */
 253         write_lock_irqsave(&addr_space_lock, flags);
 254         list_for_each_safe (lh, next, &hl->addr_list) {
 255                 as = list_entry(lh, struct hpsb_address_serve, hl_list);
 256
 257                 if (as->host == host)
 258                         __delete_addr(as);
 259         }
 260         write_unlock_irqrestore(&addr_space_lock, flags);
 261
 262         /* Now update the config-rom to reflect anything removed by the
 263          * highlevel driver. */
 264         if (update_cr && host->update_config_rom) {
 265                 if (hpsb_update_config_rom_image(host) < 0) {
 266                         HPSB_ERR("Failed to generate Configuration ROM image for host "
 267                                  "%s-%d", hl->name, host->id);
 268                 }
 269         }
 270
 271         /* And finally, remove all the host info associated between these
 272          * two. */
 273         hpsb_destroy_hostinfo(hl, host);
 274 }
 275
 276 static int highlevel_for_each_host_unreg(struct hpsb_host *host, void *__data)
 277 {
 278         struct hpsb_highlevel *hl = __data;
 279
 280         __unregister_host(hl, host, 1);
 281
 282         return 0;
 283 }
 284
 285 void hpsb_unregister_highlevel(struct hpsb_highlevel *hl)
 286 {
 287         write_lock(&hl_irqs_lock);
 288         list_del(&hl->irq_list);
 289         write_unlock(&hl_irqs_lock);
 290
 291         down_write(&hl_drivers_sem);
 292         list_del(&hl->hl_list);
 293         up_write(&hl_drivers_sem);
 294
 295         nodemgr_for_each_host(hl, highlevel_for_each_host_unreg);
 296 }
 297
 298 u64 hpsb_allocate_and_register_addrspace(struct hpsb_highlevel *hl,
 299                                          struct hpsb_host *host,
 300                                          struct hpsb_address_ops *ops,
 301                                          u64 size, u64 alignment,
 302                                          u64 start, u64 end)
 303 {
 304         struct hpsb_address_serve *as, *a1, *a2;
 305         struct list_head *entry;
 306         u64 retval = ~0ULL;
 307         unsigned long flags;
 308         u64 align_mask = ~(alignment - 1);
 309
 310         if ((alignment & 3) || (alignment > 0x800000000000ULL) ||
 311             ((hweight32(alignment >> 32) +
 312               hweight32(alignment & 0xffffffff) != 1))) {
 313                 HPSB_ERR("%s called with invalid alignment: 0x%048llx",
 314                          __FUNCTION__, (unsigned long long)alignment);
 315                 return retval;
 316         }
 317
 318         if (start == ~0ULL && end == ~0ULL) {
 319                 start = CSR1212_ALL_SPACE_BASE + 0xffff00000000ULL;  /* ohci1394.c limit */
 320                 end = CSR1212_ALL_SPACE_END;
 321         }
 322
 323         if (((start|end) & ~align_mask) || (start >= end) || (end > 0x1000000000000ULL)) {
 324                 HPSB_ERR("%s called with invalid addresses (start = %012Lx    end = %012Lx)",
 325                          __FUNCTION__, (unsigned long long)start, (unsigned long long)end);
 326                 return retval;
 327         }
 328
 329         as = (struct hpsb_address_serve *)
 330                 kmalloc(sizeof(struct hpsb_address_serve), GFP_KERNEL);
 331         if (as == NULL) {
 332                 return retval;
 333         }
 334
 335         INIT_LIST_HEAD(&as->host_list);
 336         INIT_LIST_HEAD(&as->hl_list);
 337         as->op = ops;
 338         as->host = host;
 339
 340         write_lock_irqsave(&addr_space_lock, flags);
 341
 342         list_for_each(entry, &host->addr_space) {
 343                 u64 a1sa, a1ea;
 344                 u64 a2sa, a2ea;
 345
 346                 a1 = list_entry(entry, struct hpsb_address_serve, host_list);
 347                 a2 = list_entry(entry->next, struct hpsb_address_serve, host_list);
 348
 349                 a1sa = a1->start & align_mask;
 350                 a1ea = (a1->end + alignment -1) & align_mask;
 351                 a2sa = a2->start & align_mask;
 352                 a2ea = (a2->end + alignment -1) & align_mask;
 353
 354                 if ((a2sa - a1ea >= size) && (a2sa - start >= size) && (a2sa > start)) {
 355                         as->start = max(start, a1ea);
 356                         as->end = as->start + size;
 357                         list_add(&as->host_list, entry);
 358                         list_add_tail(&as->hl_list, &hl->addr_list);
 359                         retval = as->start;
 360                         break;
 361                 }
 362         }
 363
 364         write_unlock_irqrestore(&addr_space_lock, flags);
 365
 366         if (retval == ~0ULL) {
 367                 kfree(as);
 368         }
 369
 370         return retval;
 371 }
 372
 373 int hpsb_register_addrspace(struct hpsb_highlevel *hl, struct hpsb_host *host,
 374                             struct hpsb_address_ops *ops, u64 start, u64 end)
 375 {
 376         struct hpsb_address_serve *as;
 377         struct list_head *lh;
 378         int retval = 0;
 379         unsigned long flags;
 380
 381         if (((start|end) & 3) || (start >= end) || (end > 0x1000000000000ULL)) {
 382                 HPSB_ERR("%s called with invalid addresses", __FUNCTION__);
 383                 return 0;
 384         }
 385
 386         as = (struct hpsb_address_serve *)
 387                 kmalloc(sizeof(struct hpsb_address_serve), GFP_ATOMIC);
 388         if (as == NULL) {
 389                 return 0;
 390         }
 391
 392         INIT_LIST_HEAD(&as->host_list);
 393         INIT_LIST_HEAD(&as->hl_list);
 394         as->op = ops;
 395         as->start = start;
 396         as->end = end;
 397         as->host = host;
 398
 399         write_lock_irqsave(&addr_space_lock, flags);
 400
 401         list_for_each(lh, &host->addr_space) {
 402                 struct hpsb_address_serve *as_this =
 403                         list_entry(lh, struct hpsb_address_serve, host_list);
 404                 struct hpsb_address_serve *as_next =
 405                         list_entry(lh->next, struct hpsb_address_serve, host_list);
 406
 407                 if (as_this->end > as->start)
 408                         break;
 409
 410                 if (as_next->start >= as->end) {
 411                         list_add(&as->host_list, lh);
 412                         list_add_tail(&as->hl_list, &hl->addr_list);
 413                         retval = 1;
 414                         break;
 415                 }
 416         }
 417         write_unlock_irqrestore(&addr_space_lock, flags);
 418
 419         if (retval == 0)
 420                 kfree(as);
 421
 422         return retval;
 423 }
 424
 425 int hpsb_unregister_addrspace(struct hpsb_highlevel *hl, struct hpsb_host *host,
 426                               u64 start)
 427 {
 428         int retval = 0;
 429         struct hpsb_address_serve *as;
 430         struct list_head *lh, *next;
 431         unsigned long flags;
 432
 433         write_lock_irqsave(&addr_space_lock, flags);
 434
 435         list_for_each_safe (lh, next, &hl->addr_list) {
 436                 as = list_entry(lh, struct hpsb_address_serve, hl_list);
 437                 if (as->start == start && as->host == host) {
 438                         __delete_addr(as);
 439                         retval = 1;
 440                         break;
 441                 }
 442         }
 443
 444         write_unlock_irqrestore(&addr_space_lock, flags);
 445
 446         return retval;
 447 }
 448
 449 int hpsb_listen_channel(struct hpsb_highlevel *hl, struct hpsb_host *host,
 450                          unsigned int channel)
 451 {
 452         if (channel > 63) {
 453                 HPSB_ERR("%s called with invalid channel", __FUNCTION__);
 454                 return -EINVAL;
 455         }
 456
 457         if (host->iso_listen_count[channel]++ == 0) {
 458                 return host->driver->devctl(host, ISO_LISTEN_CHANNEL, channel);
 459         }
 460
 461         return 0;
 462 }
 463
 464 void hpsb_unlisten_channel(struct hpsb_highlevel *hl, struct hpsb_host *host,
 465                            unsigned int channel)
 466 {
 467         if (channel > 63) {
 468                 HPSB_ERR("%s called with invalid channel", __FUNCTION__);
 469                 return;
 470         }
 471
 472         if (--host->iso_listen_count[channel] == 0) {
 473                 host->driver->devctl(host, ISO_UNLISTEN_CHANNEL, channel);
 474         }
 475 }
 476
 477 static void init_hpsb_highlevel(struct hpsb_host *host)
 478 {
 479         INIT_LIST_HEAD(&dummy_zero_addr.host_list);
 480         INIT_LIST_HEAD(&dummy_zero_addr.hl_list);
 481         INIT_LIST_HEAD(&dummy_max_addr.host_list);
 482         INIT_LIST_HEAD(&dummy_max_addr.hl_list);
 483
 484         dummy_zero_addr.op = dummy_max_addr.op = &dummy_ops;
 485
 486         dummy_zero_addr.start = dummy_zero_addr.end = 0;
 487         dummy_max_addr.start = dummy_max_addr.end = ((u64) 1) << 48;
 488
 489         list_add_tail(&dummy_zero_addr.host_list, &host->addr_space);
 490         list_add_tail(&dummy_max_addr.host_list, &host->addr_space);
 491 }
 492
 493 void highlevel_add_host(struct hpsb_host *host)
 494 {
 495         struct hpsb_highlevel *hl;
 496
 497         init_hpsb_highlevel(host);
 498
 499         down_read(&hl_drivers_sem);
 500         list_for_each_entry(hl, &hl_drivers, hl_list) {
 501                 if (hl->add_host)
 502                         hl->add_host(host);
 503         }
 504         up_read(&hl_drivers_sem);
 505         if (host->update_config_rom) {
 506                 if (hpsb_update_config_rom_image(host) < 0)
 507                         HPSB_ERR("Failed to generate Configuration ROM image for "
 508                                  "host %s-%d", hl->name, host->id);
 509         }
 510 }
 511
 512 void highlevel_remove_host(struct hpsb_host *host)
 513 {
 514         struct hpsb_highlevel *hl;
 515
 516         down_read(&hl_drivers_sem);
 517         list_for_each_entry(hl, &hl_drivers, hl_list)
 518                 __unregister_host(hl, host, 0);
 519         up_read(&hl_drivers_sem);
 520 }
 521
 522 void highlevel_host_reset(struct hpsb_host *host)
 523 {
 524         struct hpsb_highlevel *hl;
 525
 526         read_lock(&hl_irqs_lock);
 527         list_for_each_entry(hl, &hl_irqs, irq_list) {
 528                 if (hl->host_reset)
 529                         hl->host_reset(host);
 530         }
 531         read_unlock(&hl_irqs_lock);
 532 }
 533
 534 void highlevel_iso_receive(struct hpsb_host *host, void *data, size_t length)
 535 {
 536         struct hpsb_highlevel *hl;
 537         int channel = (((quadlet_t *)data)[0] >> 8) & 0x3f;
 538
 539         read_lock(&hl_irqs_lock);
 540         list_for_each_entry(hl, &hl_irqs, irq_list) {
 541                 if (hl->iso_receive)
 542                         hl->iso_receive(host, channel, data, length);
 543         }
 544         read_unlock(&hl_irqs_lock);
 545 }
 546
 547 void highlevel_fcp_request(struct hpsb_host *host, int nodeid, int direction,
 548                            void *data, size_t length)
 549 {
 550         struct hpsb_highlevel *hl;
 551         int cts = ((quadlet_t *)data)[0] >> 4;
 552
 553         read_lock(&hl_irqs_lock);
 554         list_for_each_entry(hl, &hl_irqs, irq_list) {
 555                 if (hl->fcp_request)
 556                         hl->fcp_request(host, nodeid, direction, cts, data,
 557                                         length);
 558         }
 559         read_unlock(&hl_irqs_lock);
 560 }
 561
 562 int highlevel_read(struct hpsb_host *host, int nodeid, void *data,
 563                    u64 addr, unsigned int length, u16 flags)
 564 {
 565         struct hpsb_address_serve *as;
 566         unsigned int partlength;
 567         int rcode = RCODE_ADDRESS_ERROR;
 568
 569         read_lock(&addr_space_lock);
 570
 571         list_for_each_entry(as, &host->addr_space, host_list) {
 572                 if (as->start > addr)
 573                         break;
 574
 575                 if (as->end > addr) {
 576                         partlength = min(as->end - addr, (u64) length);
 577
 578                         if (as->op->read) {
 579                                 rcode = as->op->read(host, nodeid, data,
 580                                                      addr, partlength, flags);
 581                         } else {
 582                                 rcode = RCODE_TYPE_ERROR;
 583                         }
 584
 585                         data += partlength;
 586                         length -= partlength;
 587                         addr += partlength;
 588
 589                         if ((rcode != RCODE_COMPLETE) || !length) {
 590                                 break;
 591                         }
 592                 }
 593         }
 594
 595         read_unlock(&addr_space_lock);
 596
 597         if (length && (rcode == RCODE_COMPLETE)) {
 598                 rcode = RCODE_ADDRESS_ERROR;
 599         }
 600
 601         return rcode;
 602 }
 603
 604 int highlevel_write(struct hpsb_host *host, int nodeid, int destid,
 605                     void *data, u64 addr, unsigned int length, u16 flags)
 606 {
 607         struct hpsb_address_serve *as;
 608         unsigned int partlength;
 609         int rcode = RCODE_ADDRESS_ERROR;
 610
 611         read_lock(&addr_space_lock);
 612
 613         list_for_each_entry(as, &host->addr_space, host_list) {
 614                 if (as->start > addr)
 615                         break;
 616
 617                 if (as->end > addr) {
 618                         partlength = min(as->end - addr, (u64) length);
 619
 620                         if (as->op->write) {
 621                                 rcode = as->op->write(host, nodeid, destid,
 622                                                       data, addr, partlength, flags);
 623                         } else {
 624                                 rcode = RCODE_TYPE_ERROR;
 625                         }
 626
 627                         data += partlength;
 628                         length -= partlength;
 629                         addr += partlength;
 630
 631                         if ((rcode != RCODE_COMPLETE) || !length) {
 632                                 break;
 633                         }
 634                 }
 635         }
 636
 637         read_unlock(&addr_space_lock);
 638
 639         if (length && (rcode == RCODE_COMPLETE)) {
 640                 rcode = RCODE_ADDRESS_ERROR;
 641         }
 642
 643         return rcode;
 644 }
 645
 646
 647 int highlevel_lock(struct hpsb_host *host, int nodeid, quadlet_t *store,
 648                    u64 addr, quadlet_t data, quadlet_t arg, int ext_tcode, u16 flags)
 649 {
 650         struct hpsb_address_serve *as;
 651         int rcode = RCODE_ADDRESS_ERROR;
 652
 653         read_lock(&addr_space_lock);
 654
 655         list_for_each_entry(as, &host->addr_space, host_list) {
 656                 if (as->start > addr)
 657                         break;
 658
 659                 if (as->end > addr) {
 660                         if (as->op->lock) {
 661                                 rcode = as->op->lock(host, nodeid, store, addr,
 662                                                      data, arg, ext_tcode, flags);
 663                         } else {
 664                                 rcode = RCODE_TYPE_ERROR;
 665                         }
 666
 667                         break;
 668                 }
 669         }
 670
 671         read_unlock(&addr_space_lock);
 672
 673         return rcode;
 674 }
 675
 676 int highlevel_lock64(struct hpsb_host *host, int nodeid, octlet_t *store,
 677                      u64 addr, octlet_t data, octlet_t arg, int ext_tcode, u16 flags)
 678 {
 679         struct hpsb_address_serve *as;
 680         int rcode = RCODE_ADDRESS_ERROR;
 681
 682         read_lock(&addr_space_lock);
 683
 684         list_for_each_entry(as, &host->addr_space, host_list) {
 685                 if (as->start > addr)
 686                         break;
 687
 688                 if (as->end > addr) {
 689                         if (as->op->lock64) {
 690                                 rcode = as->op->lock64(host, nodeid, store,
 691                                                        addr, data, arg,
 692                                                        ext_tcode, flags);
 693                         } else {
 694                                 rcode = RCODE_TYPE_ERROR;
 695                         }
 696
 697                         break;
 698                 }
 699         }
 700
 701         read_unlock(&addr_space_lock);
 702
 703         return rcode;
 704 }