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         return NULL;
  72 }
  73
  74 /* Returns a per host/driver data structure that was previously stored by
  75  * hpsb_create_hostinfo. */
  76 void *hpsb_get_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host)
  77 {
  78         struct hl_host_info *hi = hl_get_hostinfo(hl, host);
  79
  80         return hi ? hi->data : NULL;
  81 }
  82
  83 /* If size is zero, then the return here is only valid for error checking */
  84 void *hpsb_create_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host,
  85                            size_t data_size)
  86 {
  87         struct hl_host_info *hi;
  88         void *data;
  89         unsigned long flags;
  90
  91         hi = hl_get_hostinfo(hl, host);
  92         if (hi) {
  93                 HPSB_ERR("%s called hpsb_create_hostinfo when hostinfo already"
  94                          " exists", hl->name);
  95                 return NULL;
  96         }
  97
  98         hi = kzalloc(sizeof(*hi) + data_size, GFP_ATOMIC);
  99         if (!hi)
 100                 return NULL;
 101
 102         if (data_size) {
 103                 data = hi->data = hi + 1;
 104                 hi->size = data_size;
 105         } else
 106                 data = hi;
 107
 108         hi->host = host;
 109
 110         write_lock_irqsave(&hl->host_info_lock, flags);
 111         list_add_tail(&hi->list, &hl->host_info_list);
 112         write_unlock_irqrestore(&hl->host_info_lock, flags);
 113
 114         return data;
 115 }
 116
 117 int hpsb_set_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host,
 118                       void *data)
 119 {
 120         struct hl_host_info *hi;
 121
 122         hi = hl_get_hostinfo(hl, host);
 123         if (hi) {
 124                 if (!hi->size && !hi->data) {
 125                         hi->data = data;
 126                         return 0;
 127                 } else
 128                         HPSB_ERR("%s called hpsb_set_hostinfo when hostinfo "
 129                                  "already has data", hl->name);
 130         } else
 131                 HPSB_ERR("%s called hpsb_set_hostinfo when no hostinfo exists",
 132                          hl->name);
 133         return -EINVAL;
 134 }
 135
 136 void hpsb_destroy_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host)
 137 {
 138         struct hl_host_info *hi;
 139
 140         hi = hl_get_hostinfo(hl, host);
 141         if (hi) {
 142                 unsigned long flags;
 143                 write_lock_irqsave(&hl->host_info_lock, flags);
 144                 list_del(&hi->list);
 145                 write_unlock_irqrestore(&hl->host_info_lock, flags);
 146                 kfree(hi);
 147         }
 148         return;
 149 }
 150
 151 void hpsb_set_hostinfo_key(struct hpsb_highlevel *hl, struct hpsb_host *host,
 152                            unsigned long key)
 153 {
 154         struct hl_host_info *hi;
 155
 156         hi = hl_get_hostinfo(hl, host);
 157         if (hi)
 158                 hi->key = key;
 159         return;
 160 }
 161
 162 void *hpsb_get_hostinfo_bykey(struct hpsb_highlevel *hl, unsigned long key)
 163 {
 164         struct hl_host_info *hi;
 165         void *data = NULL;
 166
 167         if (!hl)
 168                 return NULL;
 169
 170         read_lock(&hl->host_info_lock);
 171         list_for_each_entry(hi, &hl->host_info_list, list) {
 172                 if (hi->key == key) {
 173                         data = hi->data;
 174                         break;
 175                 }
 176         }
 177         read_unlock(&hl->host_info_lock);
 178         return data;
 179 }
 180
 181 static int highlevel_for_each_host_reg(struct hpsb_host *host, void *__data)
 182 {
 183         struct hpsb_highlevel *hl = __data;
 184
 185         hl->add_host(host);
 186
 187         if (host->update_config_rom && hpsb_update_config_rom_image(host) < 0)
 188                 HPSB_ERR("Failed to generate Configuration ROM image for host "
 189                          "%s-%d", hl->name, host->id);
 190         return 0;
 191 }
 192
 193 void hpsb_register_highlevel(struct hpsb_highlevel *hl)
 194 {
 195         unsigned long flags;
 196
 197         INIT_LIST_HEAD(&hl->addr_list);
 198         INIT_LIST_HEAD(&hl->host_info_list);
 199
 200         rwlock_init(&hl->host_info_lock);
 201
 202         down_write(&hl_drivers_sem);
 203         list_add_tail(&hl->hl_list, &hl_drivers);
 204         up_write(&hl_drivers_sem);
 205
 206         write_lock_irqsave(&hl_irqs_lock, flags);
 207         list_add_tail(&hl->irq_list, &hl_irqs);
 208         write_unlock_irqrestore(&hl_irqs_lock, flags);
 209
 210         if (hl->add_host)
 211                 nodemgr_for_each_host(hl, highlevel_for_each_host_reg);
 212         return;
 213 }
 214
 215 static void __delete_addr(struct hpsb_address_serve *as)
 216 {
 217         list_del(&as->host_list);
 218         list_del(&as->hl_list);
 219         kfree(as);
 220 }
 221
 222 static void __unregister_host(struct hpsb_highlevel *hl, struct hpsb_host *host,
 223                               int update_cr)
 224 {
 225         unsigned long flags;
 226         struct list_head *lh, *next;
 227         struct hpsb_address_serve *as;
 228
 229         /* First, let the highlevel driver unreg */
 230         if (hl->remove_host)
 231                 hl->remove_host(host);
 232
 233         /* Remove any addresses that are matched for this highlevel driver
 234          * and this particular host. */
 235         write_lock_irqsave(&addr_space_lock, flags);
 236         list_for_each_safe (lh, next, &hl->addr_list) {
 237                 as = list_entry(lh, struct hpsb_address_serve, hl_list);
 238                 if (as->host == host)
 239                         __delete_addr(as);
 240         }
 241         write_unlock_irqrestore(&addr_space_lock, flags);
 242
 243         /* Now update the config-rom to reflect anything removed by the
 244          * highlevel driver. */
 245         if (update_cr && host->update_config_rom &&
 246             hpsb_update_config_rom_image(host) < 0)
 247                 HPSB_ERR("Failed to generate Configuration ROM image for host "
 248                          "%s-%d", hl->name, host->id);
 249
 250         /* Finally remove all the host info associated between these two. */
 251         hpsb_destroy_hostinfo(hl, host);
 252 }
 253
 254 static int highlevel_for_each_host_unreg(struct hpsb_host *host, void *__data)
 255 {
 256         struct hpsb_highlevel *hl = __data;
 257
 258         __unregister_host(hl, host, 1);
 259         return 0;
 260 }
 261
 262 void hpsb_unregister_highlevel(struct hpsb_highlevel *hl)
 263 {
 264         unsigned long flags;
 265
 266         write_lock_irqsave(&hl_irqs_lock, flags);
 267         list_del(&hl->irq_list);
 268         write_unlock_irqrestore(&hl_irqs_lock, flags);
 269
 270         down_write(&hl_drivers_sem);
 271         list_del(&hl->hl_list);
 272         up_write(&hl_drivers_sem);
 273
 274         nodemgr_for_each_host(hl, highlevel_for_each_host_unreg);
 275 }
 276
 277 u64 hpsb_allocate_and_register_addrspace(struct hpsb_highlevel *hl,
 278                                          struct hpsb_host *host,
 279                                          struct hpsb_address_ops *ops,
 280                                          u64 size, u64 alignment,
 281                                          u64 start, u64 end)
 282 {
 283         struct hpsb_address_serve *as, *a1, *a2;
 284         struct list_head *entry;
 285         u64 retval = CSR1212_INVALID_ADDR_SPACE;
 286         unsigned long flags;
 287         u64 align_mask = ~(alignment - 1);
 288
 289         if ((alignment & 3) || (alignment > 0x800000000000ULL) ||
 290             (hweight64(alignment) != 1)) {
 291                 HPSB_ERR("%s called with invalid alignment: 0x%048llx",
 292                          __FUNCTION__, (unsigned long long)alignment);
 293                 return retval;
 294         }
 295
 296         /* default range,
 297          * avoids controller's posted write area (see OHCI 1.1 clause 1.5) */
 298         if (start == CSR1212_INVALID_ADDR_SPACE &&
 299             end   == CSR1212_INVALID_ADDR_SPACE) {
 300                 start = host->middle_addr_space;
 301                 end   = CSR1212_ALL_SPACE_END;
 302         }
 303
 304         if (((start|end) & ~align_mask) || (start >= end) ||
 305             (end > CSR1212_ALL_SPACE_END)) {
 306                 HPSB_ERR("%s called with invalid addresses "
 307                          "(start = %012Lx  end = %012Lx)", __FUNCTION__,
 308                          (unsigned long long)start,(unsigned long long)end);
 309                 return retval;
 310         }
 311
 312         as = kmalloc(sizeof(*as), GFP_KERNEL);
 313         if (!as)
 314                 return retval;
 315
 316         INIT_LIST_HEAD(&as->host_list);
 317         INIT_LIST_HEAD(&as->hl_list);
 318         as->op = ops;
 319         as->host = host;
 320
 321         write_lock_irqsave(&addr_space_lock, flags);
 322         list_for_each(entry, &host->addr_space) {
 323                 u64 a1sa, a1ea;
 324                 u64 a2sa, a2ea;
 325
 326                 a1 = list_entry(entry, struct hpsb_address_serve, host_list);
 327                 a2 = list_entry(entry->next, struct hpsb_address_serve,
 328                                 host_list);
 329
 330                 a1sa = a1->start & align_mask;
 331                 a1ea = (a1->end + alignment -1) & align_mask;
 332                 a2sa = a2->start & align_mask;
 333                 a2ea = (a2->end + alignment -1) & align_mask;
 334
 335                 if ((a2sa - a1ea >= size) && (a2sa - start >= size) &&
 336                     (a2sa > start)) {
 337                         as->start = max(start, a1ea);
 338                         as->end = as->start + size;
 339                         list_add(&as->host_list, entry);
 340                         list_add_tail(&as->hl_list, &hl->addr_list);
 341                         retval = as->start;
 342                         break;
 343                 }
 344         }
 345         write_unlock_irqrestore(&addr_space_lock, flags);
 346
 347         if (retval == CSR1212_INVALID_ADDR_SPACE)
 348                 kfree(as);
 349         return retval;
 350 }
 351
 352 int hpsb_register_addrspace(struct hpsb_highlevel *hl, struct hpsb_host *host,
 353                             struct hpsb_address_ops *ops, u64 start, u64 end)
 354 {
 355         struct hpsb_address_serve *as;
 356         struct list_head *lh;
 357         int retval = 0;
 358         unsigned long flags;
 359
 360         if (((start|end) & 3) || (start >= end) ||
 361             (end > CSR1212_ALL_SPACE_END)) {
 362                 HPSB_ERR("%s called with invalid addresses", __FUNCTION__);
 363                 return 0;
 364         }
 365
 366         as = kmalloc(sizeof(*as), GFP_ATOMIC);
 367         if (!as)
 368                 return 0;
 369
 370         INIT_LIST_HEAD(&as->host_list);
 371         INIT_LIST_HEAD(&as->hl_list);
 372         as->op = ops;
 373         as->start = start;
 374         as->end = end;
 375         as->host = host;
 376
 377         write_lock_irqsave(&addr_space_lock, flags);
 378         list_for_each(lh, &host->addr_space) {
 379                 struct hpsb_address_serve *as_this =
 380                         list_entry(lh, struct hpsb_address_serve, host_list);
 381                 struct hpsb_address_serve *as_next =
 382                         list_entry(lh->next, struct hpsb_address_serve,
 383                                    host_list);
 384
 385                 if (as_this->end > as->start)
 386                         break;
 387
 388                 if (as_next->start >= as->end) {
 389                         list_add(&as->host_list, lh);
 390                         list_add_tail(&as->hl_list, &hl->addr_list);
 391                         retval = 1;
 392                         break;
 393                 }
 394         }
 395         write_unlock_irqrestore(&addr_space_lock, flags);
 396
 397         if (retval == 0)
 398                 kfree(as);
 399         return retval;
 400 }
 401
 402 int hpsb_unregister_addrspace(struct hpsb_highlevel *hl, struct hpsb_host *host,
 403                               u64 start)
 404 {
 405         int retval = 0;
 406         struct hpsb_address_serve *as;
 407         struct list_head *lh, *next;
 408         unsigned long flags;
 409
 410         write_lock_irqsave(&addr_space_lock, flags);
 411         list_for_each_safe (lh, next, &hl->addr_list) {
 412                 as = list_entry(lh, struct hpsb_address_serve, hl_list);
 413                 if (as->start == start && as->host == host) {
 414                         __delete_addr(as);
 415                         retval = 1;
 416                         break;
 417                 }
 418         }
 419         write_unlock_irqrestore(&addr_space_lock, flags);
 420         return retval;
 421 }
 422
 423 int hpsb_listen_channel(struct hpsb_highlevel *hl, struct hpsb_host *host,
 424                         unsigned int channel)
 425 {
 426         if (channel > 63) {
 427                 HPSB_ERR("%s called with invalid channel", __FUNCTION__);
 428                 return -EINVAL;
 429         }
 430         if (host->iso_listen_count[channel]++ == 0)
 431                 return host->driver->devctl(host, ISO_LISTEN_CHANNEL, channel);
 432         return 0;
 433 }
 434
 435 void hpsb_unlisten_channel(struct hpsb_highlevel *hl, struct hpsb_host *host,
 436                            unsigned int channel)
 437 {
 438         if (channel > 63) {
 439                 HPSB_ERR("%s called with invalid channel", __FUNCTION__);
 440                 return;
 441         }
 442         if (--host->iso_listen_count[channel] == 0)
 443                 host->driver->devctl(host, ISO_UNLISTEN_CHANNEL, channel);
 444 }
 445
 446 static void init_hpsb_highlevel(struct hpsb_host *host)
 447 {
 448         INIT_LIST_HEAD(&dummy_zero_addr.host_list);
 449         INIT_LIST_HEAD(&dummy_zero_addr.hl_list);
 450         INIT_LIST_HEAD(&dummy_max_addr.host_list);
 451         INIT_LIST_HEAD(&dummy_max_addr.hl_list);
 452
 453         dummy_zero_addr.op = dummy_max_addr.op = &dummy_ops;
 454
 455         dummy_zero_addr.start = dummy_zero_addr.end = 0;
 456         dummy_max_addr.start = dummy_max_addr.end = ((u64) 1) << 48;
 457
 458         list_add_tail(&dummy_zero_addr.host_list, &host->addr_space);
 459         list_add_tail(&dummy_max_addr.host_list, &host->addr_space);
 460 }
 461
 462 void highlevel_add_host(struct hpsb_host *host)
 463 {
 464         struct hpsb_highlevel *hl;
 465
 466         init_hpsb_highlevel(host);
 467
 468         down_read(&hl_drivers_sem);
 469         list_for_each_entry(hl, &hl_drivers, hl_list) {
 470                 if (hl->add_host)
 471                         hl->add_host(host);
 472         }
 473         up_read(&hl_drivers_sem);
 474         if (host->update_config_rom && hpsb_update_config_rom_image(host) < 0)
 475                 HPSB_ERR("Failed to generate Configuration ROM image for host "
 476                          "%s-%d", hl->name, host->id);
 477 }
 478
 479 void highlevel_remove_host(struct hpsb_host *host)
 480 {
 481         struct hpsb_highlevel *hl;
 482
 483         down_read(&hl_drivers_sem);
 484         list_for_each_entry(hl, &hl_drivers, hl_list)
 485                 __unregister_host(hl, host, 0);
 486         up_read(&hl_drivers_sem);
 487 }
 488
 489 void highlevel_host_reset(struct hpsb_host *host)
 490 {
 491         unsigned long flags;
 492         struct hpsb_highlevel *hl;
 493
 494         read_lock_irqsave(&hl_irqs_lock, flags);
 495         list_for_each_entry(hl, &hl_irqs, irq_list) {
 496                 if (hl->host_reset)
 497                         hl->host_reset(host);
 498         }
 499         read_unlock_irqrestore(&hl_irqs_lock, flags);
 500 }
 501
 502 void highlevel_iso_receive(struct hpsb_host *host, void *data, size_t length)
 503 {
 504         unsigned long flags;
 505         struct hpsb_highlevel *hl;
 506         int channel = (((quadlet_t *)data)[0] >> 8) & 0x3f;
 507
 508         read_lock_irqsave(&hl_irqs_lock, flags);
 509         list_for_each_entry(hl, &hl_irqs, irq_list) {
 510                 if (hl->iso_receive)
 511                         hl->iso_receive(host, channel, data, length);
 512         }
 513         read_unlock_irqrestore(&hl_irqs_lock, flags);
 514 }
 515
 516 void highlevel_fcp_request(struct hpsb_host *host, int nodeid, int direction,
 517                            void *data, size_t length)
 518 {
 519         unsigned long flags;
 520         struct hpsb_highlevel *hl;
 521         int cts = ((quadlet_t *)data)[0] >> 4;
 522
 523         read_lock_irqsave(&hl_irqs_lock, flags);
 524         list_for_each_entry(hl, &hl_irqs, irq_list) {
 525                 if (hl->fcp_request)
 526                         hl->fcp_request(host, nodeid, direction, cts, data,
 527                                         length);
 528         }
 529         read_unlock_irqrestore(&hl_irqs_lock, flags);
 530 }
 531
 532 int highlevel_read(struct hpsb_host *host, int nodeid, void *data, u64 addr,
 533                    unsigned int length, u16 flags)
 534 {
 535         struct hpsb_address_serve *as;
 536         unsigned int partlength;
 537         int rcode = RCODE_ADDRESS_ERROR;
 538
 539         read_lock(&addr_space_lock);
 540         list_for_each_entry(as, &host->addr_space, host_list) {
 541                 if (as->start > addr)
 542                         break;
 543
 544                 if (as->end > addr) {
 545                         partlength = min(as->end - addr, (u64) length);
 546
 547                         if (as->op->read)
 548                                 rcode = as->op->read(host, nodeid, data,
 549                                                      addr, partlength, flags);
 550                         else
 551                                 rcode = RCODE_TYPE_ERROR;
 552
 553                         data += partlength;
 554                         length -= partlength;
 555                         addr += partlength;
 556
 557                         if ((rcode != RCODE_COMPLETE) || !length)
 558                                 break;
 559                 }
 560         }
 561         read_unlock(&addr_space_lock);
 562
 563         if (length && (rcode == RCODE_COMPLETE))
 564                 rcode = RCODE_ADDRESS_ERROR;
 565         return rcode;
 566 }
 567
 568 int highlevel_write(struct hpsb_host *host, int nodeid, int destid, void *data,
 569                     u64 addr, unsigned int length, u16 flags)
 570 {
 571         struct hpsb_address_serve *as;
 572         unsigned int partlength;
 573         int rcode = RCODE_ADDRESS_ERROR;
 574
 575         read_lock(&addr_space_lock);
 576         list_for_each_entry(as, &host->addr_space, host_list) {
 577                 if (as->start > addr)
 578                         break;
 579
 580                 if (as->end > addr) {
 581                         partlength = min(as->end - addr, (u64) length);
 582
 583                         if (as->op->write)
 584                                 rcode = as->op->write(host, nodeid, destid,
 585                                                       data, addr, partlength,
 586                                                       flags);
 587                         else
 588                                 rcode = RCODE_TYPE_ERROR;
 589
 590                         data += partlength;
 591                         length -= partlength;
 592                         addr += partlength;
 593
 594                         if ((rcode != RCODE_COMPLETE) || !length)
 595                                 break;
 596                 }
 597         }
 598         read_unlock(&addr_space_lock);
 599
 600         if (length && (rcode == RCODE_COMPLETE))
 601                 rcode = RCODE_ADDRESS_ERROR;
 602         return rcode;
 603 }
 604
 605 int highlevel_lock(struct hpsb_host *host, int nodeid, quadlet_t *store,
 606                    u64 addr, quadlet_t data, quadlet_t arg, int ext_tcode,
 607                    u16 flags)
 608 {
 609         struct hpsb_address_serve *as;
 610         int rcode = RCODE_ADDRESS_ERROR;
 611
 612         read_lock(&addr_space_lock);
 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                         if (as->op->lock)
 619                                 rcode = as->op->lock(host, nodeid, store, addr,
 620                                                      data, arg, ext_tcode,
 621                                                      flags);
 622                         else
 623                                 rcode = RCODE_TYPE_ERROR;
 624                         break;
 625                 }
 626         }
 627         read_unlock(&addr_space_lock);
 628         return rcode;
 629 }
 630
 631 int highlevel_lock64(struct hpsb_host *host, int nodeid, octlet_t *store,
 632                      u64 addr, octlet_t data, octlet_t arg, int ext_tcode,
 633                      u16 flags)
 634 {
 635         struct hpsb_address_serve *as;
 636         int rcode = RCODE_ADDRESS_ERROR;
 637
 638         read_lock(&addr_space_lock);
 639
 640         list_for_each_entry(as, &host->addr_space, host_list) {
 641                 if (as->start > addr)
 642                         break;
 643
 644                 if (as->end > addr) {
 645                         if (as->op->lock64)
 646                                 rcode = as->op->lock64(host, nodeid, store,
 647                                                        addr, data, arg,
 648                                                        ext_tcode, flags);
 649                         else
 650                                 rcode = RCODE_TYPE_ERROR;
 651                         break;
 652                 }
 653         }
 654         read_unlock(&addr_space_lock);
 655         return rcode;
 656 }