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
  23 #include "ieee1394.h"
  24 #include "ieee1394_types.h"
  25 #include "hosts.h"
  26 #include "ieee1394_core.h"
  27 #include "highlevel.h"
  28
  29
  30 LIST_HEAD(hl_drivers);
  31 rwlock_t hl_drivers_lock = RW_LOCK_UNLOCKED;
  32
  33 LIST_HEAD(addr_space);
  34 rwlock_t addr_space_lock = RW_LOCK_UNLOCKED;
  35
  36 /* addr_space list will have zero and max already included as bounds */
  37 static struct hpsb_address_ops dummy_ops = { NULL, NULL, NULL, NULL };
  38 static struct hpsb_address_serve dummy_zero_addr, dummy_max_addr;
  39
  40 struct hpsb_highlevel *hpsb_register_highlevel(const char *name,
  41                                                struct hpsb_highlevel_ops *ops)
  42 {
  43         struct hpsb_highlevel *hl;
  44
  45         hl = (struct hpsb_highlevel *)kmalloc(sizeof(struct hpsb_highlevel),
  46                                               GFP_KERNEL);
  47         if (hl == NULL) {
  48                 return NULL;
  49         }
  50
  51         INIT_LIST_HEAD(&hl->hl_list);
  52         INIT_LIST_HEAD(&hl->addr_list);
  53         hl->name = name;
  54         hl->op = ops;
  55
  56         write_lock_irq(&hl_drivers_lock);
  57         list_add_tail(&hl->hl_list, &hl_drivers);
  58         write_unlock_irq(&hl_drivers_lock);
  59
  60         hl_all_hosts(hl->op->add_host);
  61
  62         return hl;
  63 }
  64
  65 void hpsb_unregister_highlevel(struct hpsb_highlevel *hl)
  66 {
  67         struct list_head *entry;
  68         struct hpsb_address_serve *as;
  69
  70         if (hl == NULL) {
  71                 return;
  72         }
  73
  74         write_lock_irq(&addr_space_lock);
  75         entry = hl->addr_list.next;
  76
  77         while (entry != &hl->addr_list) {
  78                 as = list_entry(entry, struct hpsb_address_serve, addr_list);
  79                 list_del(&as->as_list);
  80                 entry = entry->next;
  81                 kfree(as);
  82         }
  83         write_unlock_irq(&addr_space_lock);
  84
  85         write_lock_irq(&hl_drivers_lock);
  86         list_del(&hl->hl_list);
  87         write_unlock_irq(&hl_drivers_lock);
  88
  89         if (hl->op->remove_host)
  90                 hl_all_hosts(hl->op->remove_host);
  91
  92         kfree(hl);
  93 }
  94
  95 int hpsb_register_addrspace(struct hpsb_highlevel *hl,
  96                             struct hpsb_address_ops *ops, u64 start, u64 end)
  97 {
  98         struct hpsb_address_serve *as;
  99         struct list_head *entry;
 100         int retval = 0;
 101
 102         if (((start|end) & 3) || (start >= end) || (end > 0x1000000000000ULL)) {
 103                 HPSB_ERR("%s called with invalid addresses", __FUNCTION__);
 104                 return 0;
 105         }
 106
 107         as = (struct hpsb_address_serve *)
 108                 kmalloc(sizeof(struct hpsb_address_serve), GFP_KERNEL);
 109         if (as == NULL) {
 110                 return 0;
 111         }
 112
 113         INIT_LIST_HEAD(&as->as_list);
 114         INIT_LIST_HEAD(&as->addr_list);
 115         as->op = ops;
 116         as->start = start;
 117         as->end = end;
 118
 119         write_lock_irq(&addr_space_lock);
 120         entry = addr_space.next;
 121
 122         while (list_entry(entry, struct hpsb_address_serve, as_list)->end
 123                <= start) {
 124                 if (list_entry(entry->next, struct hpsb_address_serve, as_list)
 125                     ->start >= end) {
 126                         list_add(&as->as_list, entry);
 127                         list_add_tail(&as->addr_list, &hl->addr_list);
 128                         retval = 1;
 129                         break;
 130                 }
 131                 entry = entry->next;
 132         }
 133         write_unlock_irq(&addr_space_lock);
 134
 135         if (retval == 0) {
 136                 kfree(as);
 137         }
 138
 139         return retval;
 140 }
 141
 142 int hpsb_unregister_addrspace(struct hpsb_highlevel *hl, u64 start)
 143 {
 144         int retval = 0;
 145         struct hpsb_address_serve *as;
 146         struct list_head *entry;
 147
 148         write_lock_irq(&addr_space_lock);
 149
 150         entry = hl->addr_list.next;
 151
 152         while (entry != &hl->addr_list) {
 153                 as = list_entry(entry, struct hpsb_address_serve, addr_list);
 154                 entry = entry->next;
 155                 if (as->start == start) {
 156                         list_del(&as->as_list);
 157                         list_del(&as->addr_list);
 158                         kfree(as);
 159                         retval = 1;
 160                         break;
 161                 }
 162         }
 163
 164         write_unlock_irq(&addr_space_lock);
 165
 166         return retval;
 167 }
 168
 169 void hpsb_listen_channel(struct hpsb_highlevel *hl, struct hpsb_host *host,
 170                          unsigned int channel)
 171 {
 172         if (channel > 63) {
 173                 HPSB_ERR("%s called with invalid channel", __FUNCTION__);
 174                 return;
 175         }
 176
 177         if (host->iso_listen_count[channel]++ == 0) {
 178                 host->driver->devctl(host, ISO_LISTEN_CHANNEL, channel);
 179         }
 180 }
 181
 182 void hpsb_unlisten_channel(struct hpsb_highlevel *hl, struct hpsb_host *host,
 183                            unsigned int channel)
 184 {
 185         if (channel > 63) {
 186                 HPSB_ERR("%s called with invalid channel", __FUNCTION__);
 187                 return;
 188         }
 189
 190         if (--host->iso_listen_count[channel] == 0) {
 191                 host->driver->devctl(host, ISO_UNLISTEN_CHANNEL, channel);
 192         }
 193 }
 194
 195
 196 void highlevel_add_host(struct hpsb_host *host)
 197 {
 198         struct list_head *entry;
 199         struct hpsb_highlevel *hl;
 200
 201         read_lock(&hl_drivers_lock);
 202         list_for_each(entry, &hl_drivers) {
 203                 hl = list_entry(entry, struct hpsb_highlevel, hl_list);
 204
 205                 hl->op->add_host(host);
 206         }
 207         read_unlock(&hl_drivers_lock);
 208 }
 209
 210 void highlevel_remove_host(struct hpsb_host *host)
 211 {
 212         struct list_head *entry;
 213         struct hpsb_highlevel *hl;
 214
 215         write_lock_irq(&hl_drivers_lock);
 216         list_for_each(entry, &hl_drivers) {
 217                 hl = list_entry(entry, struct hpsb_highlevel, hl_list);
 218
 219                 if (hl->op->remove_host)
 220                         hl->op->remove_host(host);
 221         }
 222         write_unlock_irq(&hl_drivers_lock);
 223 }
 224
 225 void highlevel_host_reset(struct hpsb_host *host)
 226 {
 227         struct list_head *entry;
 228         struct hpsb_highlevel *hl;
 229
 230         read_lock(&hl_drivers_lock);
 231         list_for_each(entry, &hl_drivers) {
 232                 hl = list_entry(entry, struct hpsb_highlevel, hl_list);
 233
 234                 if (hl->op->host_reset)
 235                         hl->op->host_reset(host);
 236         }
 237         read_unlock(&hl_drivers_lock);
 238 }
 239
 240 void highlevel_iso_receive(struct hpsb_host *host, quadlet_t *data,
 241                            unsigned int length)
 242 {
 243         struct list_head *entry;
 244         struct hpsb_highlevel *hl;
 245         int channel = (data[0] >> 8) & 0x3f;
 246
 247         read_lock(&hl_drivers_lock);
 248         entry = hl_drivers.next;
 249
 250         while (entry != &hl_drivers) {
 251                 hl = list_entry(entry, struct hpsb_highlevel, hl_list);
 252                 if (hl->op->iso_receive) {
 253                         hl->op->iso_receive(host, channel, data, length);
 254                 }
 255                 entry = entry->next;
 256         }
 257         read_unlock(&hl_drivers_lock);
 258 }
 259
 260 void highlevel_fcp_request(struct hpsb_host *host, int nodeid, int direction,
 261                            u8 *data, unsigned int length)
 262 {
 263         struct list_head *entry;
 264         struct hpsb_highlevel *hl;
 265         int cts = data[0] >> 4;
 266
 267         read_lock(&hl_drivers_lock);
 268         entry = hl_drivers.next;
 269
 270         while (entry != &hl_drivers) {
 271                 hl = list_entry(entry, struct hpsb_highlevel, hl_list);
 272                 if (hl->op->fcp_request) {
 273                         hl->op->fcp_request(host, nodeid, direction, cts, data,
 274                                             length);
 275                 }
 276                 entry = entry->next;
 277         }
 278         read_unlock(&hl_drivers_lock);
 279 }
 280
 281 int highlevel_read(struct hpsb_host *host, int nodeid, quadlet_t *buffer,
 282                    u64 addr, unsigned int length, u16 flags)
 283 {
 284         struct hpsb_address_serve *as;
 285         struct list_head *entry;
 286         unsigned int partlength;
 287         int rcode = RCODE_ADDRESS_ERROR;
 288
 289         read_lock(&addr_space_lock);
 290
 291         entry = addr_space.next;
 292         as = list_entry(entry, struct hpsb_address_serve, as_list);
 293
 294         while (as->start <= addr) {
 295                 if (as->end > addr) {
 296                         partlength = min(as->end - addr, (u64) length);
 297
 298                         if (as->op->read != NULL) {
 299                                 rcode = as->op->read(host, nodeid, buffer,
 300                                                      addr, partlength, flags);
 301                         } else {
 302                                 rcode = RCODE_TYPE_ERROR;
 303                         }
 304
 305                         length -= partlength;
 306                         addr += partlength;
 307
 308                         if ((rcode != RCODE_COMPLETE) || !length) {
 309                                 break;
 310                         }
 311                 }
 312
 313                 entry = entry->next;
 314                 as = list_entry(entry, struct hpsb_address_serve, as_list);
 315         }
 316
 317         read_unlock(&addr_space_lock);
 318
 319         if (length && (rcode == RCODE_COMPLETE)) {
 320                 rcode = RCODE_ADDRESS_ERROR;
 321         }
 322
 323         return rcode;
 324 }
 325
 326 int highlevel_write(struct hpsb_host *host, int nodeid, int destid,
 327                     quadlet_t *data, u64 addr, unsigned int length, u16 flags)
 328 {
 329         struct hpsb_address_serve *as;
 330         struct list_head *entry;
 331         unsigned int partlength;
 332         int rcode = RCODE_ADDRESS_ERROR;
 333
 334         read_lock(&addr_space_lock);
 335
 336         entry = addr_space.next;
 337         as = list_entry(entry, struct hpsb_address_serve, as_list);
 338
 339         while (as->start <= addr) {
 340                 if (as->end > addr) {
 341                         partlength = min(as->end - addr, (u64) length);
 342
 343                         if (as->op->write != NULL) {
 344                                 rcode = as->op->write(host, nodeid, destid,
 345                                                       data, addr, partlength, flags);
 346                         } else {
 347                                 rcode = RCODE_TYPE_ERROR;
 348                         }
 349
 350                         length -= partlength;
 351                         addr += partlength;
 352
 353                         if ((rcode != RCODE_COMPLETE) || !length) {
 354                                 break;
 355                         }
 356                 }
 357
 358                 entry = entry->next;
 359                 as = list_entry(entry, struct hpsb_address_serve, as_list);
 360         }
 361
 362         read_unlock(&addr_space_lock);
 363
 364         if (length && (rcode == RCODE_COMPLETE)) {
 365                 rcode = RCODE_ADDRESS_ERROR;
 366         }
 367
 368         return rcode;
 369 }
 370
 371
 372 int highlevel_lock(struct hpsb_host *host, int nodeid, quadlet_t *store,
 373                    u64 addr, quadlet_t data, quadlet_t arg, int ext_tcode, u16 flags)
 374 {
 375         struct hpsb_address_serve *as;
 376         struct list_head *entry;
 377         int rcode = RCODE_ADDRESS_ERROR;
 378
 379         read_lock(&addr_space_lock);
 380
 381         entry = addr_space.next;
 382         as = list_entry(entry, struct hpsb_address_serve, as_list);
 383
 384         while (as->start <= addr) {
 385                 if (as->end > addr) {
 386                         if (as->op->lock != NULL) {
 387                                 rcode = as->op->lock(host, nodeid, store, addr,
 388                                                      data, arg, ext_tcode, flags);
 389                         } else {
 390                                 rcode = RCODE_TYPE_ERROR;
 391                         }
 392
 393                         break;
 394                 }
 395
 396                 entry = entry->next;
 397                 as = list_entry(entry, struct hpsb_address_serve, as_list);
 398         }
 399
 400         read_unlock(&addr_space_lock);
 401
 402         return rcode;
 403 }
 404
 405 int highlevel_lock64(struct hpsb_host *host, int nodeid, octlet_t *store,
 406                      u64 addr, octlet_t data, octlet_t arg, int ext_tcode, u16 flags)
 407 {
 408         struct hpsb_address_serve *as;
 409         struct list_head *entry;
 410         int rcode = RCODE_ADDRESS_ERROR;
 411
 412         read_lock(&addr_space_lock);
 413
 414         entry = addr_space.next;
 415         as = list_entry(entry, struct hpsb_address_serve, as_list);
 416
 417         while (as->start <= addr) {
 418                 if (as->end > addr) {
 419                         if (as->op->lock64 != NULL) {
 420                                 rcode = as->op->lock64(host, nodeid, store,
 421                                                        addr, data, arg,
 422                                                        ext_tcode, flags);
 423                         } else {
 424                                 rcode = RCODE_TYPE_ERROR;
 425                         }
 426
 427                         break;
 428                 }
 429
 430                 entry = entry->next;
 431                 as = list_entry(entry, struct hpsb_address_serve, as_list);
 432         }
 433
 434         read_unlock(&addr_space_lock);
 435
 436         return rcode;
 437 }
 438
 439 void init_hpsb_highlevel(void)
 440 {
 441         INIT_LIST_HEAD(&dummy_zero_addr.as_list);
 442         INIT_LIST_HEAD(&dummy_zero_addr.addr_list);
 443         INIT_LIST_HEAD(&dummy_max_addr.as_list);
 444         INIT_LIST_HEAD(&dummy_max_addr.addr_list);
 445
 446         dummy_zero_addr.op = dummy_max_addr.op = &dummy_ops;
 447
 448         dummy_zero_addr.start = dummy_zero_addr.end = 0;
 449         dummy_max_addr.start = dummy_max_addr.end = ((u64) 1) << 48;
 450
 451         list_add_tail(&dummy_zero_addr.as_list, &addr_space);
 452         list_add_tail(&dummy_max_addr.as_list, &addr_space);
 453 }