drivers/ieee1394/csr1212.c

   1 /*
   2  * csr1212.c -- IEEE 1212 Control and Status Register support for Linux
   3  *
   4  * Copyright (C) 2003 Francois Retief <fgretief@sun.ac.za>
   5  *                    Steve Kinneberg <kinnebergsteve@acmsystems.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions are met:
   9  *
  10  *    1. Redistributions of source code must retain the above copyright notice,
  11  *       this list of conditions and the following disclaimer.
  12  *    2. Redistributions in binary form must reproduce the above copyright
  13  *       notice, this list of conditions and the following disclaimer in the
  14  *       documentation and/or other materials provided with the distribution.
  15  *    3. The name of the author may not be used to endorse or promote products
  16  *       derived from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
  19  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  20  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
  21  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  22  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  23  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  24  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  25  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  26  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  27  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30
  31 /* TODO List:
  32  * - Verify interface consistency: i.e., public functions that take a size
  33  *   parameter expect size to be in bytes.
  34  */
  35
  36 #include <linux/errno.h>
  37 #include <linux/kernel.h>
  38 #include <linux/string.h>
  39 #include <asm/bug.h>
  40 #include <asm/byteorder.h>
  41
  42 #include "csr1212.h"
  43
  44
  45 /* Permitted key type for each key id */
  46 #define __I (1 << CSR1212_KV_TYPE_IMMEDIATE)
  47 #define __C (1 << CSR1212_KV_TYPE_CSR_OFFSET)
  48 #define __D (1 << CSR1212_KV_TYPE_DIRECTORY)
  49 #define __L (1 << CSR1212_KV_TYPE_LEAF)
  50 static const u8 csr1212_key_id_type_map[0x30] = {
  51         __C,                    /* used by Apple iSight */
  52         __D | __L,              /* Descriptor */
  53         __I | __D | __L,        /* Bus_Dependent_Info */
  54         __I | __D | __L,        /* Vendor */
  55         __I,                    /* Hardware_Version */
  56         0, 0,                   /* Reserved */
  57         __D | __L | __I,        /* Module */
  58         __I, 0, 0, 0,           /* used by Apple iSight, Reserved */
  59         __I,                    /* Node_Capabilities */
  60         __L,                    /* EUI_64 */
  61         0, 0, 0,                /* Reserved */
  62         __D,                    /* Unit */
  63         __I,                    /* Specifier_ID */
  64         __I,                    /* Version */
  65         __I | __C | __D | __L,  /* Dependent_Info */
  66         __L,                    /* Unit_Location */
  67         0,                      /* Reserved */
  68         __I,                    /* Model */
  69         __D,                    /* Instance */
  70         __L,                    /* Keyword */
  71         __D,                    /* Feature */
  72         __L,                    /* Extended_ROM */
  73         __I,                    /* Extended_Key_Specifier_ID */
  74         __I,                    /* Extended_Key */
  75         __I | __C | __D | __L,  /* Extended_Data */
  76         __L,                    /* Modifiable_Descriptor */
  77         __I,                    /* Directory_ID */
  78         __I,                    /* Revision */
  79 };
  80 #undef __I
  81 #undef __C
  82 #undef __D
  83 #undef __L
  84
  85
  86 #define quads_to_bytes(_q) ((_q) * sizeof(u32))
  87 #define bytes_to_quads(_b) (((_b) + sizeof(u32) - 1) / sizeof(u32))
  88
  89 static void free_keyval(struct csr1212_keyval *kv)
  90 {
  91         if ((kv->key.type == CSR1212_KV_TYPE_LEAF) &&
  92             (kv->key.id != CSR1212_KV_ID_EXTENDED_ROM))
  93                 CSR1212_FREE(kv->value.leaf.data);
  94
  95         CSR1212_FREE(kv);
  96 }
  97
  98 static u16 csr1212_crc16(const u32 *buffer, size_t length)
  99 {
 100         int shift;
 101         u32 data;
 102         u16 sum, crc = 0;
 103
 104         for (; length; length--) {
 105                 data = be32_to_cpu(*buffer);
 106                 buffer++;
 107                 for (shift = 28; shift >= 0; shift -= 4 ) {
 108                         sum = ((crc >> 12) ^ (data >> shift)) & 0xf;
 109                         crc = (crc << 4) ^ (sum << 12) ^ (sum << 5) ^ (sum);
 110                 }
 111                 crc &= 0xffff;
 112         }
 113
 114         return cpu_to_be16(crc);
 115 }
 116
 117 /* Microsoft computes the CRC with the bytes in reverse order. */
 118 static u16 csr1212_msft_crc16(const u32 *buffer, size_t length)
 119 {
 120         int shift;
 121         u32 data;
 122         u16 sum, crc = 0;
 123
 124         for (; length; length--) {
 125                 data = le32_to_cpu(*buffer);
 126                 buffer++;
 127                 for (shift = 28; shift >= 0; shift -= 4 ) {
 128                         sum = ((crc >> 12) ^ (data >> shift)) & 0xf;
 129                         crc = (crc << 4) ^ (sum << 12) ^ (sum << 5) ^ (sum);
 130                 }
 131                 crc &= 0xffff;
 132         }
 133
 134         return cpu_to_be16(crc);
 135 }
 136
 137 static struct csr1212_dentry *
 138 csr1212_find_keyval(struct csr1212_keyval *dir, struct csr1212_keyval *kv)
 139 {
 140         struct csr1212_dentry *pos;
 141
 142         for (pos = dir->value.directory.dentries_head;
 143              pos != NULL; pos = pos->next)
 144                 if (pos->kv == kv)
 145                         return pos;
 146         return NULL;
 147 }
 148
 149 static struct csr1212_keyval *
 150 csr1212_find_keyval_offset(struct csr1212_keyval *kv_list, u32 offset)
 151 {
 152         struct csr1212_keyval *kv;
 153
 154         for (kv = kv_list->next; kv && (kv != kv_list); kv = kv->next)
 155                 if (kv->offset == offset)
 156                         return kv;
 157         return NULL;
 158 }
 159
 160
 161 /* Creation Routines */
 162
 163 struct csr1212_csr *csr1212_create_csr(struct csr1212_bus_ops *ops,
 164                                        size_t bus_info_size, void *private)
 165 {
 166         struct csr1212_csr *csr;
 167
 168         csr = CSR1212_MALLOC(sizeof(*csr));
 169         if (!csr)
 170                 return NULL;
 171
 172         csr->cache_head =
 173                 csr1212_rom_cache_malloc(CSR1212_CONFIG_ROM_SPACE_OFFSET,
 174                                          CSR1212_CONFIG_ROM_SPACE_SIZE);
 175         if (!csr->cache_head) {
 176                 CSR1212_FREE(csr);
 177                 return NULL;
 178         }
 179
 180         /* The keyval key id is not used for the root node, but a valid key id
 181          * that can be used for a directory needs to be passed to
 182          * csr1212_new_directory(). */
 183         csr->root_kv = csr1212_new_directory(CSR1212_KV_ID_VENDOR);
 184         if (!csr->root_kv) {
 185                 CSR1212_FREE(csr->cache_head);
 186                 CSR1212_FREE(csr);
 187                 return NULL;
 188         }
 189
 190         csr->bus_info_data = csr->cache_head->data;
 191         csr->bus_info_len = bus_info_size;
 192         csr->crc_len = bus_info_size;
 193         csr->ops = ops;
 194         csr->private = private;
 195         csr->cache_tail = csr->cache_head;
 196
 197         return csr;
 198 }
 199
 200 void csr1212_init_local_csr(struct csr1212_csr *csr,
 201                             const u32 *bus_info_data, int max_rom)
 202 {
 203         static const int mr_map[] = { 4, 64, 1024, 0 };
 204
 205         BUG_ON(max_rom & ~0x3);
 206         csr->max_rom = mr_map[max_rom];
 207         memcpy(csr->bus_info_data, bus_info_data, csr->bus_info_len);
 208 }
 209
 210 static struct csr1212_keyval *csr1212_new_keyval(u8 type, u8 key)
 211 {
 212         struct csr1212_keyval *kv;
 213
 214         if (key < 0x30 && ((csr1212_key_id_type_map[key] & (1 << type)) == 0))
 215                 return NULL;
 216
 217         kv = CSR1212_MALLOC(sizeof(*kv));
 218         if (!kv)
 219                 return NULL;
 220
 221         atomic_set(&kv->refcnt, 1);
 222         kv->key.type = type;
 223         kv->key.id = key;
 224         kv->associate = NULL;
 225         kv->next = NULL;
 226         kv->prev = NULL;
 227         kv->offset = 0;
 228         kv->valid = 0;
 229         return kv;
 230 }
 231
 232 struct csr1212_keyval *csr1212_new_immediate(u8 key, u32 value)
 233 {
 234         struct csr1212_keyval *kv;
 235
 236         kv = csr1212_new_keyval(CSR1212_KV_TYPE_IMMEDIATE, key);
 237         if (!kv)
 238                 return NULL;
 239
 240         kv->value.immediate = value;
 241         kv->valid = 1;
 242         return kv;
 243 }
 244
 245 static struct csr1212_keyval *
 246 csr1212_new_leaf(u8 key, const void *data, size_t data_len)
 247 {
 248         struct csr1212_keyval *kv;
 249
 250         kv = csr1212_new_keyval(CSR1212_KV_TYPE_LEAF, key);
 251         if (!kv)
 252                 return NULL;
 253
 254         if (data_len > 0) {
 255                 kv->value.leaf.data = CSR1212_MALLOC(data_len);
 256                 if (!kv->value.leaf.data) {
 257                         CSR1212_FREE(kv);
 258                         return NULL;
 259                 }
 260
 261                 if (data)
 262                         memcpy(kv->value.leaf.data, data, data_len);
 263         } else {
 264                 kv->value.leaf.data = NULL;
 265         }
 266
 267         kv->value.leaf.len = bytes_to_quads(data_len);
 268         kv->offset = 0;
 269         kv->valid = 1;
 270
 271         return kv;
 272 }
 273
 274 static struct csr1212_keyval *
 275 csr1212_new_csr_offset(u8 key, u32 csr_offset)
 276 {
 277         struct csr1212_keyval *kv;
 278
 279         kv = csr1212_new_keyval(CSR1212_KV_TYPE_CSR_OFFSET, key);
 280         if (!kv)
 281                 return NULL;
 282
 283         kv->value.csr_offset = csr_offset;
 284
 285         kv->offset = 0;
 286         kv->valid = 1;
 287         return kv;
 288 }
 289
 290 struct csr1212_keyval *csr1212_new_directory(u8 key)
 291 {
 292         struct csr1212_keyval *kv;
 293
 294         kv = csr1212_new_keyval(CSR1212_KV_TYPE_DIRECTORY, key);
 295         if (!kv)
 296                 return NULL;
 297
 298         kv->value.directory.len = 0;
 299         kv->offset = 0;
 300         kv->value.directory.dentries_head = NULL;
 301         kv->value.directory.dentries_tail = NULL;
 302         kv->valid = 1;
 303         return kv;
 304 }
 305
 306 void csr1212_associate_keyval(struct csr1212_keyval *kv,
 307                               struct csr1212_keyval *associate)
 308 {
 309         BUG_ON(!kv || !associate || kv->key.id == CSR1212_KV_ID_DESCRIPTOR ||
 310                (associate->key.id != CSR1212_KV_ID_DESCRIPTOR &&
 311                 associate->key.id != CSR1212_KV_ID_DEPENDENT_INFO &&
 312                 associate->key.id != CSR1212_KV_ID_EXTENDED_KEY &&
 313                 associate->key.id != CSR1212_KV_ID_EXTENDED_DATA &&
 314                 associate->key.id < 0x30) ||
 315                (kv->key.id == CSR1212_KV_ID_EXTENDED_KEY_SPECIFIER_ID &&
 316                 associate->key.id != CSR1212_KV_ID_EXTENDED_KEY) ||
 317                (kv->key.id == CSR1212_KV_ID_EXTENDED_KEY &&
 318                 associate->key.id != CSR1212_KV_ID_EXTENDED_DATA) ||
 319                (associate->key.id == CSR1212_KV_ID_EXTENDED_KEY &&
 320                 kv->key.id != CSR1212_KV_ID_EXTENDED_KEY_SPECIFIER_ID) ||
 321                (associate->key.id == CSR1212_KV_ID_EXTENDED_DATA &&
 322                 kv->key.id != CSR1212_KV_ID_EXTENDED_KEY));
 323
 324         if (kv->associate)
 325                 csr1212_release_keyval(kv->associate);
 326
 327         csr1212_keep_keyval(associate);
 328         kv->associate = associate;
 329 }
 330
 331 static int __csr1212_attach_keyval_to_directory(struct csr1212_keyval *dir,
 332                                                 struct csr1212_keyval *kv,
 333                                                 bool keep_keyval)
 334 {
 335         struct csr1212_dentry *dentry;
 336
 337         BUG_ON(!kv || !dir || dir->key.type != CSR1212_KV_TYPE_DIRECTORY);
 338
 339         dentry = CSR1212_MALLOC(sizeof(*dentry));
 340         if (!dentry)
 341                 return -ENOMEM;
 342
 343         if (keep_keyval)
 344                 csr1212_keep_keyval(kv);
 345         dentry->kv = kv;
 346
 347         dentry->next = NULL;
 348         dentry->prev = dir->value.directory.dentries_tail;
 349
 350         if (!dir->value.directory.dentries_head)
 351                 dir->value.directory.dentries_head = dentry;
 352
 353         if (dir->value.directory.dentries_tail)
 354                 dir->value.directory.dentries_tail->next = dentry;
 355         dir->value.directory.dentries_tail = dentry;
 356
 357         return CSR1212_SUCCESS;
 358 }
 359
 360 int csr1212_attach_keyval_to_directory(struct csr1212_keyval *dir,
 361                                        struct csr1212_keyval *kv)
 362 {
 363         return __csr1212_attach_keyval_to_directory(dir, kv, true);
 364 }
 365
 366 #define CSR1212_DESCRIPTOR_LEAF_DATA(kv) \
 367         (&((kv)->value.leaf.data[1]))
 368
 369 #define CSR1212_DESCRIPTOR_LEAF_SET_TYPE(kv, type) \
 370         ((kv)->value.leaf.data[0] = \
 371          cpu_to_be32(CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) | \
 372                      ((type) << CSR1212_DESCRIPTOR_LEAF_TYPE_SHIFT)))
 373 #define CSR1212_DESCRIPTOR_LEAF_SET_SPECIFIER_ID(kv, spec_id) \
 374         ((kv)->value.leaf.data[0] = \
 375          cpu_to_be32((CSR1212_DESCRIPTOR_LEAF_TYPE(kv) << \
 376                       CSR1212_DESCRIPTOR_LEAF_TYPE_SHIFT) | \
 377                      ((spec_id) & CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID_MASK)))
 378
 379 static struct csr1212_keyval *
 380 csr1212_new_descriptor_leaf(u8 dtype, u32 specifier_id,
 381                             const void *data, size_t data_len)
 382 {
 383         struct csr1212_keyval *kv;
 384
 385         kv = csr1212_new_leaf(CSR1212_KV_ID_DESCRIPTOR, NULL,
 386                               data_len + CSR1212_DESCRIPTOR_LEAF_OVERHEAD);
 387         if (!kv)
 388                 return NULL;
 389
 390         CSR1212_DESCRIPTOR_LEAF_SET_TYPE(kv, dtype);
 391         CSR1212_DESCRIPTOR_LEAF_SET_SPECIFIER_ID(kv, specifier_id);
 392
 393         if (data)
 394                 memcpy(CSR1212_DESCRIPTOR_LEAF_DATA(kv), data, data_len);
 395
 396         return kv;
 397 }
 398
 399 /* Check if string conforms to minimal ASCII as per IEEE 1212 clause 7.4 */
 400 static int csr1212_check_minimal_ascii(const char *s)
 401 {
 402         static const char minimal_ascii_table[] = {
 403                                         /*  1   2   4   8  16  32  64  128 */
 404                 128,                    /* --, --, --, --, --, --, --, 07, */
 405                 4 + 16 + 32,            /* --, --, 0a, --, 0C, 0D, --, --, */
 406                 0,                      /* --, --, --, --, --, --, --, --, */
 407                 0,                      /* --, --, --, --, --, --, --, --, */
 408                 255 - 8 - 16,           /* 20, 21, 22, --, --, 25, 26, 27, */
 409                 255,                    /* 28, 29, 2a, 2b, 2c, 2d, 2e, 2f, */
 410                 255,                    /* 30, 31, 32, 33, 34, 35, 36, 37, */
 411                 255,                    /* 38, 39, 3a, 3b, 3c, 3d, 3e, 3f, */
 412                 255,                    /* 40, 41, 42, 43, 44, 45, 46, 47, */
 413                 255,                    /* 48, 49, 4a, 4b, 4c, 4d, 4e, 4f, */
 414                 255,                    /* 50, 51, 52, 53, 54, 55, 56, 57, */
 415                 1 + 2 + 4 + 128,        /* 58, 59, 5a, --, --, --, --, 5f, */
 416                 255 - 1,                /* --, 61, 62, 63, 64, 65, 66, 67, */
 417                 255,                    /* 68, 69, 6a, 6b, 6c, 6d, 6e, 6f, */
 418                 255,                    /* 70, 71, 72, 73, 74, 75, 76, 77, */
 419                 1 + 2 + 4,              /* 78, 79, 7a, --, --, --, --, --, */
 420         };
 421         int i, j;
 422
 423         for (; *s; s++) {
 424                 i = *s >> 3;            /*  i = *s / 8;         */
 425                 j = 1 << (*s & 3);      /*  j = 1 << (*s % 8);  */
 426
 427                 if (i >= ARRAY_SIZE(minimal_ascii_table) ||
 428                     !(minimal_ascii_table[i] & j))
 429                         return -EINVAL;
 430         }
 431         return 0;
 432 }
 433
 434 /* IEEE 1212 clause 7.5.4.1 textual descriptors (English, minimal ASCII) */
 435 struct csr1212_keyval *csr1212_new_string_descriptor_leaf(const char *s)
 436 {
 437         struct csr1212_keyval *kv;
 438         u32 *text;
 439         size_t str_len, quads;
 440
 441         if (!s || !*s || csr1212_check_minimal_ascii(s))
 442                 return NULL;
 443
 444         str_len = strlen(s);
 445         quads = bytes_to_quads(str_len);
 446         kv = csr1212_new_descriptor_leaf(0, 0, NULL, quads_to_bytes(quads) +
 447                                       CSR1212_TEXTUAL_DESCRIPTOR_LEAF_OVERHEAD);
 448         if (!kv)
 449                 return NULL;
 450
 451         kv->value.leaf.data[1] = 0;     /* width, character_set, language */
 452         text = CSR1212_TEXTUAL_DESCRIPTOR_LEAF_DATA(kv);
 453         text[quads - 1] = 0;            /* padding */
 454         memcpy(text, s, str_len);
 455
 456         return kv;
 457 }
 458
 459
 460 /* Destruction Routines */
 461
 462 void csr1212_detach_keyval_from_directory(struct csr1212_keyval *dir,
 463                                           struct csr1212_keyval *kv)
 464 {
 465         struct csr1212_dentry *dentry;
 466
 467         if (!kv || !dir || dir->key.type != CSR1212_KV_TYPE_DIRECTORY)
 468                 return;
 469
 470         dentry = csr1212_find_keyval(dir, kv);
 471
 472         if (!dentry)
 473                 return;
 474
 475         if (dentry->prev)
 476                 dentry->prev->next = dentry->next;
 477         if (dentry->next)
 478                 dentry->next->prev = dentry->prev;
 479         if (dir->value.directory.dentries_head == dentry)
 480                 dir->value.directory.dentries_head = dentry->next;
 481         if (dir->value.directory.dentries_tail == dentry)
 482                 dir->value.directory.dentries_tail = dentry->prev;
 483
 484         CSR1212_FREE(dentry);
 485
 486         csr1212_release_keyval(kv);
 487 }
 488
 489 /* This function is used to free the memory taken by a keyval.  If the given
 490  * keyval is a directory type, then any keyvals contained in that directory
 491  * will be destroyed as well if noone holds a reference on them.  By means of
 492  * list manipulation, this routine will descend a directory structure in a
 493  * non-recursive manner. */
 494 void csr1212_release_keyval(struct csr1212_keyval *kv)
 495 {
 496         struct csr1212_keyval *k, *a;
 497         struct csr1212_dentry dentry;
 498         struct csr1212_dentry *head, *tail;
 499
 500         if (!atomic_dec_and_test(&kv->refcnt))
 501                 return;
 502
 503         dentry.kv = kv;
 504         dentry.next = NULL;
 505         dentry.prev = NULL;
 506
 507         head = &dentry;
 508         tail = head;
 509
 510         while (head) {
 511                 k = head->kv;
 512
 513                 while (k) {
 514                         /* must not dec_and_test kv->refcnt again */
 515                         if (k != kv && !atomic_dec_and_test(&k->refcnt))
 516                                 break;
 517
 518                         a = k->associate;
 519
 520                         if (k->key.type == CSR1212_KV_TYPE_DIRECTORY) {
 521                                 /* If the current entry is a directory, move all
 522                                  * the entries to the destruction list. */
 523                                 if (k->value.directory.dentries_head) {
 524                                         tail->next =
 525                                             k->value.directory.dentries_head;
 526                                         k->value.directory.dentries_head->prev =
 527                                             tail;
 528                                         tail = k->value.directory.dentries_tail;
 529                                 }
 530                         }
 531                         free_keyval(k);
 532                         k = a;
 533                 }
 534
 535                 head = head->next;
 536                 if (head) {
 537                         if (head->prev && head->prev != &dentry)
 538                                 CSR1212_FREE(head->prev);
 539                         head->prev = NULL;
 540                 } else if (tail != &dentry) {
 541                         CSR1212_FREE(tail);
 542                 }
 543         }
 544 }
 545
 546 void csr1212_destroy_csr(struct csr1212_csr *csr)
 547 {
 548         struct csr1212_csr_rom_cache *c, *oc;
 549         struct csr1212_cache_region *cr, *ocr;
 550
 551         csr1212_release_keyval(csr->root_kv);
 552
 553         c = csr->cache_head;
 554         while (c) {
 555                 oc = c;
 556                 cr = c->filled_head;
 557                 while (cr) {
 558                         ocr = cr;
 559                         cr = cr->next;
 560                         CSR1212_FREE(ocr);
 561                 }
 562                 c = c->next;
 563                 CSR1212_FREE(oc);
 564         }
 565
 566         CSR1212_FREE(csr);
 567 }
 568
 569
 570 /* CSR Image Creation */
 571
 572 static int csr1212_append_new_cache(struct csr1212_csr *csr, size_t romsize)
 573 {
 574         struct csr1212_csr_rom_cache *cache;
 575         u64 csr_addr;
 576
 577         BUG_ON(!csr || !csr->ops || !csr->ops->allocate_addr_range ||
 578                !csr->ops->release_addr || csr->max_rom < 1);
 579
 580         /* ROM size must be a multiple of csr->max_rom */
 581         romsize = (romsize + (csr->max_rom - 1)) & ~(csr->max_rom - 1);
 582
 583         csr_addr = csr->ops->allocate_addr_range(romsize, csr->max_rom,
 584                                                  csr->private);
 585         if (csr_addr == CSR1212_INVALID_ADDR_SPACE)
 586                 return -ENOMEM;
 587
 588         if (csr_addr < CSR1212_REGISTER_SPACE_BASE) {
 589                 /* Invalid address returned from allocate_addr_range(). */
 590                 csr->ops->release_addr(csr_addr, csr->private);
 591                 return -ENOMEM;
 592         }
 593
 594         cache = csr1212_rom_cache_malloc(csr_addr - CSR1212_REGISTER_SPACE_BASE,
 595                                          romsize);
 596         if (!cache) {
 597                 csr->ops->release_addr(csr_addr, csr->private);
 598                 return -ENOMEM;
 599         }
 600
 601         cache->ext_rom = csr1212_new_keyval(CSR1212_KV_TYPE_LEAF,
 602                                             CSR1212_KV_ID_EXTENDED_ROM);
 603         if (!cache->ext_rom) {
 604                 csr->ops->release_addr(csr_addr, csr->private);
 605                 CSR1212_FREE(cache);
 606                 return -ENOMEM;
 607         }
 608
 609         if (csr1212_attach_keyval_to_directory(csr->root_kv, cache->ext_rom) !=
 610             CSR1212_SUCCESS) {
 611                 csr1212_release_keyval(cache->ext_rom);
 612                 csr->ops->release_addr(csr_addr, csr->private);
 613                 CSR1212_FREE(cache);
 614                 return -ENOMEM;
 615         }
 616         cache->ext_rom->offset = csr_addr - CSR1212_REGISTER_SPACE_BASE;
 617         cache->ext_rom->value.leaf.len = -1;
 618         cache->ext_rom->value.leaf.data = cache->data;
 619
 620         /* Add cache to tail of cache list */
 621         cache->prev = csr->cache_tail;
 622         csr->cache_tail->next = cache;
 623         csr->cache_tail = cache;
 624         return CSR1212_SUCCESS;
 625 }
 626
 627 static void csr1212_remove_cache(struct csr1212_csr *csr,
 628                                  struct csr1212_csr_rom_cache *cache)
 629 {
 630         if (csr->cache_head == cache)
 631                 csr->cache_head = cache->next;
 632         if (csr->cache_tail == cache)
 633                 csr->cache_tail = cache->prev;
 634
 635         if (cache->prev)
 636                 cache->prev->next = cache->next;
 637         if (cache->next)
 638                 cache->next->prev = cache->prev;
 639
 640         if (cache->ext_rom) {
 641                 csr1212_detach_keyval_from_directory(csr->root_kv,
 642                                                      cache->ext_rom);
 643                 csr1212_release_keyval(cache->ext_rom);
 644         }
 645
 646         CSR1212_FREE(cache);
 647 }
 648
 649 static int csr1212_generate_layout_subdir(struct csr1212_keyval *dir,
 650                                           struct csr1212_keyval **layout_tail)
 651 {
 652         struct csr1212_dentry *dentry;
 653         struct csr1212_keyval *dkv;
 654         struct csr1212_keyval *last_extkey_spec = NULL;
 655         struct csr1212_keyval *last_extkey = NULL;
 656         int num_entries = 0;
 657
 658         for (dentry = dir->value.directory.dentries_head; dentry;
 659              dentry = dentry->next) {
 660                 for (dkv = dentry->kv; dkv; dkv = dkv->associate) {
 661                         /* Special Case: Extended Key Specifier_ID */
 662                         if (dkv->key.id ==
 663                             CSR1212_KV_ID_EXTENDED_KEY_SPECIFIER_ID) {
 664                                 if (last_extkey_spec == NULL)
 665                                         last_extkey_spec = dkv;
 666                                 else if (dkv->value.immediate !=
 667                                          last_extkey_spec->value.immediate)
 668                                         last_extkey_spec = dkv;
 669                                 else
 670                                         continue;
 671                         /* Special Case: Extended Key */
 672                         } else if (dkv->key.id == CSR1212_KV_ID_EXTENDED_KEY) {
 673                                 if (last_extkey == NULL)
 674                                         last_extkey = dkv;
 675                                 else if (dkv->value.immediate !=
 676                                          last_extkey->value.immediate)
 677                                         last_extkey = dkv;
 678                                 else
 679                                         continue;
 680                         }
 681
 682                         num_entries += 1;
 683
 684                         switch (dkv->key.type) {
 685                         default:
 686                         case CSR1212_KV_TYPE_IMMEDIATE:
 687                         case CSR1212_KV_TYPE_CSR_OFFSET:
 688                                 break;
 689                         case CSR1212_KV_TYPE_LEAF:
 690                         case CSR1212_KV_TYPE_DIRECTORY:
 691                                 /* Remove from list */
 692                                 if (dkv->prev && (dkv->prev->next == dkv))
 693                                         dkv->prev->next = dkv->next;
 694                                 if (dkv->next && (dkv->next->prev == dkv))
 695                                         dkv->next->prev = dkv->prev;
 696                                 //if (dkv == *layout_tail)
 697                                 //      *layout_tail = dkv->prev;
 698
 699                                 /* Special case: Extended ROM leafs */
 700                                 if (dkv->key.id == CSR1212_KV_ID_EXTENDED_ROM) {
 701                                         dkv->value.leaf.len = -1;
 702                                         /* Don't add Extended ROM leafs in the
 703                                          * layout list, they are handled
 704                                          * differently. */
 705                                         break;
 706                                 }
 707
 708                                 /* Add to tail of list */
 709                                 dkv->next = NULL;
 710                                 dkv->prev = *layout_tail;
 711                                 (*layout_tail)->next = dkv;
 712                                 *layout_tail = dkv;
 713                                 break;
 714                         }
 715                 }
 716         }
 717         return num_entries;
 718 }
 719
 720 static size_t csr1212_generate_layout_order(struct csr1212_keyval *kv)
 721 {
 722         struct csr1212_keyval *ltail = kv;
 723         size_t agg_size = 0;
 724
 725         while (kv) {
 726                 switch (kv->key.type) {
 727                 case CSR1212_KV_TYPE_LEAF:
 728                         /* Add 1 quadlet for crc/len field */
 729                         agg_size += kv->value.leaf.len + 1;
 730                         break;
 731
 732                 case CSR1212_KV_TYPE_DIRECTORY:
 733                         kv->value.directory.len =
 734                                 csr1212_generate_layout_subdir(kv, &ltail);
 735                         /* Add 1 quadlet for crc/len field */
 736                         agg_size += kv->value.directory.len + 1;
 737                         break;
 738                 }
 739                 kv = kv->next;
 740         }
 741         return quads_to_bytes(agg_size);
 742 }
 743
 744 static struct csr1212_keyval *
 745 csr1212_generate_positions(struct csr1212_csr_rom_cache *cache,
 746                            struct csr1212_keyval *start_kv, int start_pos)
 747 {
 748         struct csr1212_keyval *kv = start_kv;
 749         struct csr1212_keyval *okv = start_kv;
 750         int pos = start_pos;
 751         int kv_len = 0, okv_len = 0;
 752
 753         cache->layout_head = kv;
 754
 755         while (kv && pos < cache->size) {
 756                 /* Special case: Extended ROM leafs */
 757                 if (kv->key.id != CSR1212_KV_ID_EXTENDED_ROM)
 758                         kv->offset = cache->offset + pos;
 759
 760                 switch (kv->key.type) {
 761                 case CSR1212_KV_TYPE_LEAF:
 762                         kv_len = kv->value.leaf.len;
 763                         break;
 764
 765                 case CSR1212_KV_TYPE_DIRECTORY:
 766                         kv_len = kv->value.directory.len;
 767                         break;
 768
 769                 default:
 770                         /* Should never get here */
 771                         WARN_ON(1);
 772                         break;
 773                 }
 774
 775                 pos += quads_to_bytes(kv_len + 1);
 776
 777                 if (pos <= cache->size) {
 778                         okv = kv;
 779                         okv_len = kv_len;
 780                         kv = kv->next;
 781                 }
 782         }
 783
 784         cache->layout_tail = okv;
 785         cache->len = okv->offset - cache->offset + quads_to_bytes(okv_len + 1);
 786
 787         return kv;
 788 }
 789
 790 #define CSR1212_KV_KEY_SHIFT            24
 791 #define CSR1212_KV_KEY_TYPE_SHIFT       6
 792 #define CSR1212_KV_KEY_ID_MASK          0x3f
 793 #define CSR1212_KV_KEY_TYPE_MASK        0x3     /* after shift */
 794
 795 static void
 796 csr1212_generate_tree_subdir(struct csr1212_keyval *dir, u32 *data_buffer)
 797 {
 798         struct csr1212_dentry *dentry;
 799         struct csr1212_keyval *last_extkey_spec = NULL;
 800         struct csr1212_keyval *last_extkey = NULL;
 801         int index = 0;
 802
 803         for (dentry = dir->value.directory.dentries_head;
 804              dentry;
 805              dentry = dentry->next) {
 806                 struct csr1212_keyval *a;
 807
 808                 for (a = dentry->kv; a; a = a->associate) {
 809                         u32 value = 0;
 810
 811                         /* Special Case: Extended Key Specifier_ID */
 812                         if (a->key.id ==
 813                             CSR1212_KV_ID_EXTENDED_KEY_SPECIFIER_ID) {
 814                                 if (last_extkey_spec == NULL)
 815                                         last_extkey_spec = a;
 816                                 else if (a->value.immediate !=
 817                                          last_extkey_spec->value.immediate)
 818                                         last_extkey_spec = a;
 819                                 else
 820                                         continue;
 821
 822                         /* Special Case: Extended Key */
 823                         } else if (a->key.id == CSR1212_KV_ID_EXTENDED_KEY) {
 824                                 if (last_extkey == NULL)
 825                                         last_extkey = a;
 826                                 else if (a->value.immediate !=
 827                                          last_extkey->value.immediate)
 828                                         last_extkey = a;
 829                                 else
 830                                         continue;
 831                         }
 832
 833                         switch (a->key.type) {
 834                         case CSR1212_KV_TYPE_IMMEDIATE:
 835                                 value = a->value.immediate;
 836                                 break;
 837                         case CSR1212_KV_TYPE_CSR_OFFSET:
 838                                 value = a->value.csr_offset;
 839                                 break;
 840                         case CSR1212_KV_TYPE_LEAF:
 841                                 value = a->offset;
 842                                 value -= dir->offset + quads_to_bytes(1+index);
 843                                 value = bytes_to_quads(value);
 844                                 break;
 845                         case CSR1212_KV_TYPE_DIRECTORY:
 846                                 value = a->offset;
 847                                 value -= dir->offset + quads_to_bytes(1+index);
 848                                 value = bytes_to_quads(value);
 849                                 break;
 850                         default:
 851                                 /* Should never get here */
 852                                 WARN_ON(1);
 853                                 break;
 854                         }
 855
 856                         value |= (a->key.id & CSR1212_KV_KEY_ID_MASK) <<
 857                                  CSR1212_KV_KEY_SHIFT;
 858                         value |= (a->key.type & CSR1212_KV_KEY_TYPE_MASK) <<
 859                                  (CSR1212_KV_KEY_SHIFT +
 860                                   CSR1212_KV_KEY_TYPE_SHIFT);
 861                         data_buffer[index] = cpu_to_be32(value);
 862                         index++;
 863                 }
 864         }
 865 }
 866
 867 struct csr1212_keyval_img {
 868         u16 length;
 869         u16 crc;
 870
 871         /* Must be last */
 872         u32 data[0];    /* older gcc can't handle [] which is standard */
 873 };
 874
 875 static void csr1212_fill_cache(struct csr1212_csr_rom_cache *cache)
 876 {
 877         struct csr1212_keyval *kv, *nkv;
 878         struct csr1212_keyval_img *kvi;
 879
 880         for (kv = cache->layout_head;
 881              kv != cache->layout_tail->next;
 882              kv = nkv) {
 883                 kvi = (struct csr1212_keyval_img *)(cache->data +
 884                                 bytes_to_quads(kv->offset - cache->offset));
 885                 switch (kv->key.type) {
 886                 default:
 887                 case CSR1212_KV_TYPE_IMMEDIATE:
 888                 case CSR1212_KV_TYPE_CSR_OFFSET:
 889                         /* Should never get here */
 890                         WARN_ON(1);
 891                         break;
 892
 893                 case CSR1212_KV_TYPE_LEAF:
 894                         /* Don't copy over Extended ROM areas, they are
 895                          * already filled out! */
 896                         if (kv->key.id != CSR1212_KV_ID_EXTENDED_ROM)
 897                                 memcpy(kvi->data, kv->value.leaf.data,
 898                                        quads_to_bytes(kv->value.leaf.len));
 899
 900                         kvi->length = cpu_to_be16(kv->value.leaf.len);
 901                         kvi->crc = csr1212_crc16(kvi->data, kv->value.leaf.len);
 902                         break;
 903
 904                 case CSR1212_KV_TYPE_DIRECTORY:
 905                         csr1212_generate_tree_subdir(kv, kvi->data);
 906
 907                         kvi->length = cpu_to_be16(kv->value.directory.len);
 908                         kvi->crc = csr1212_crc16(kvi->data,
 909                                                  kv->value.directory.len);
 910                         break;
 911                 }
 912
 913                 nkv = kv->next;
 914                 if (kv->prev)
 915                         kv->prev->next = NULL;
 916                 if (kv->next)
 917                         kv->next->prev = NULL;
 918                 kv->prev = NULL;
 919                 kv->next = NULL;
 920         }
 921 }
 922
 923 /* This size is arbitrarily chosen.
 924  * The struct overhead is subtracted for more economic allocations. */
 925 #define CSR1212_EXTENDED_ROM_SIZE (2048 - sizeof(struct csr1212_csr_rom_cache))
 926
 927 int csr1212_generate_csr_image(struct csr1212_csr *csr)
 928 {
 929         struct csr1212_bus_info_block_img *bi;
 930         struct csr1212_csr_rom_cache *cache;
 931         struct csr1212_keyval *kv;
 932         size_t agg_size;
 933         int ret;
 934         int init_offset;
 935
 936         BUG_ON(!csr);
 937
 938         cache = csr->cache_head;
 939
 940         bi = (struct csr1212_bus_info_block_img*)cache->data;
 941
 942         bi->length = bytes_to_quads(csr->bus_info_len) - 1;
 943         bi->crc_length = bi->length;
 944         bi->crc = csr1212_crc16(bi->data, bi->crc_length);
 945
 946         csr->root_kv->next = NULL;
 947         csr->root_kv->prev = NULL;
 948
 949         agg_size = csr1212_generate_layout_order(csr->root_kv);
 950
 951         init_offset = csr->bus_info_len;
 952
 953         for (kv = csr->root_kv, cache = csr->cache_head;
 954              kv;
 955              cache = cache->next) {
 956                 if (!cache) {
 957                         /* Estimate approximate number of additional cache
 958                          * regions needed (it assumes that the cache holding
 959                          * the first 1K Config ROM space always exists). */
 960                         int est_c = agg_size / (CSR1212_EXTENDED_ROM_SIZE -
 961                                                 (2 * sizeof(u32))) + 1;
 962
 963                         /* Add additional cache regions, extras will be
 964                          * removed later */
 965                         for (; est_c; est_c--) {
 966                                 ret = csr1212_append_new_cache(csr,
 967                                                 CSR1212_EXTENDED_ROM_SIZE);
 968                                 if (ret != CSR1212_SUCCESS)
 969                                         return ret;
 970                         }
 971                         /* Need to re-layout for additional cache regions */
 972                         agg_size = csr1212_generate_layout_order(csr->root_kv);
 973                         kv = csr->root_kv;
 974                         cache = csr->cache_head;
 975                         init_offset = csr->bus_info_len;
 976                 }
 977                 kv = csr1212_generate_positions(cache, kv, init_offset);
 978                 agg_size -= cache->len;
 979                 init_offset = sizeof(u32);
 980         }
 981
 982         /* Remove unused, excess cache regions */
 983         while (cache) {
 984                 struct csr1212_csr_rom_cache *oc = cache;
 985
 986                 cache = cache->next;
 987                 csr1212_remove_cache(csr, oc);
 988         }
 989
 990         /* Go through the list backward so that when done, the correct CRC
 991          * will be calculated for the Extended ROM areas. */
 992         for (cache = csr->cache_tail; cache; cache = cache->prev) {
 993                 /* Only Extended ROM caches should have this set. */
 994                 if (cache->ext_rom) {
 995                         int leaf_size;
 996
 997                         /* Make sure the Extended ROM leaf is a multiple of
 998                          * max_rom in size. */
 999                         BUG_ON(csr->max_rom < 1);
1000                         leaf_size = (cache->len + (csr->max_rom - 1)) &
1001                                 ~(csr->max_rom - 1);
1002
1003                         /* Zero out the unused ROM region */
1004                         memset(cache->data + bytes_to_quads(cache->len), 0x00,
1005                                leaf_size - cache->len);
1006
1007                         /* Subtract leaf header */
1008                         leaf_size -= sizeof(u32);
1009
1010                         /* Update the Extended ROM leaf length */
1011                         cache->ext_rom->value.leaf.len =
1012                                 bytes_to_quads(leaf_size);
1013                 } else {
1014                         /* Zero out the unused ROM region */
1015                         memset(cache->data + bytes_to_quads(cache->len), 0x00,
1016                                cache->size - cache->len);
1017                 }
1018
1019                 /* Copy the data into the cache buffer */
1020                 csr1212_fill_cache(cache);
1021
1022                 if (cache != csr->cache_head) {
1023                         /* Set the length and CRC of the extended ROM. */
1024                         struct csr1212_keyval_img *kvi =
1025                                 (struct csr1212_keyval_img*)cache->data;
1026                         u16 len = bytes_to_quads(cache->len) - 1;
1027
1028                         kvi->length = cpu_to_be16(len);
1029                         kvi->crc = csr1212_crc16(kvi->data, len);
1030                 }
1031         }
1032
1033         return CSR1212_SUCCESS;
1034 }
1035
1036 int csr1212_read(struct csr1212_csr *csr, u32 offset, void *buffer, u32 len)
1037 {
1038         struct csr1212_csr_rom_cache *cache;
1039
1040         for (cache = csr->cache_head; cache; cache = cache->next)
1041                 if (offset >= cache->offset &&
1042                     (offset + len) <= (cache->offset + cache->size)) {
1043                         memcpy(buffer, &cache->data[
1044                                         bytes_to_quads(offset - cache->offset)],
1045                                len);
1046                         return CSR1212_SUCCESS;
1047                 }
1048
1049         return -ENOENT;
1050 }
1051
1052 /*
1053  * Apparently there are many different wrong implementations of the CRC
1054  * algorithm.  We don't fail, we just warn... approximately once per GUID.
1055  */
1056 static void
1057 csr1212_check_crc(const u32 *buffer, size_t length, u16 crc, __be32 *guid)
1058 {
1059         static u64 last_bad_eui64;
1060         u64 eui64 = ((u64)be32_to_cpu(guid[0]) << 32) | be32_to_cpu(guid[1]);
1061
1062         if (csr1212_crc16(buffer, length) == crc ||
1063             csr1212_msft_crc16(buffer, length) == crc ||
1064             eui64 == last_bad_eui64)
1065                 return;
1066
1067         printk(KERN_DEBUG "ieee1394: config ROM CRC error\n");
1068         last_bad_eui64 = eui64;
1069 }
1070
1071 /* Parse a chunk of data as a Config ROM */
1072
1073 static int csr1212_parse_bus_info_block(struct csr1212_csr *csr)
1074 {
1075         struct csr1212_bus_info_block_img *bi;
1076         struct csr1212_cache_region *cr;
1077         int i;
1078         int ret;
1079
1080         /* IEEE 1212 says that the entire bus info block should be readable in
1081          * a single transaction regardless of the max_rom value.
1082          * Unfortunately, many IEEE 1394 devices do not abide by that, so the
1083          * bus info block will be read 1 quadlet at a time.  The rest of the
1084          * ConfigROM will be read according to the max_rom field. */
1085         for (i = 0; i < csr->bus_info_len; i += sizeof(u32)) {
1086                 ret = csr->ops->bus_read(csr, CSR1212_CONFIG_ROM_SPACE_BASE + i,
1087                         sizeof(u32), &csr->cache_head->data[bytes_to_quads(i)],
1088                         csr->private);
1089                 if (ret != CSR1212_SUCCESS)
1090                         return ret;
1091
1092                 /* check ROM header's info_length */
1093                 if (i == 0 &&
1094                     be32_to_cpu(csr->cache_head->data[0]) >> 24 !=
1095                     bytes_to_quads(csr->bus_info_len) - 1)
1096                         return -EINVAL;
1097         }
1098
1099         bi = (struct csr1212_bus_info_block_img*)csr->cache_head->data;
1100         csr->crc_len = quads_to_bytes(bi->crc_length);
1101
1102         /* IEEE 1212 recommends that crc_len be equal to bus_info_len, but that
1103          * is not always the case, so read the rest of the crc area 1 quadlet at
1104          * a time. */
1105         for (i = csr->bus_info_len; i <= csr->crc_len; i += sizeof(u32)) {
1106                 ret = csr->ops->bus_read(csr, CSR1212_CONFIG_ROM_SPACE_BASE + i,
1107                         sizeof(u32), &csr->cache_head->data[bytes_to_quads(i)],
1108                         csr->private);
1109                 if (ret != CSR1212_SUCCESS)
1110                         return ret;
1111         }
1112
1113         csr1212_check_crc(bi->data, bi->crc_length, bi->crc,
1114                           &csr->bus_info_data[3]);
1115
1116         cr = CSR1212_MALLOC(sizeof(*cr));
1117         if (!cr)
1118                 return -ENOMEM;
1119
1120         cr->next = NULL;
1121         cr->prev = NULL;
1122         cr->offset_start = 0;
1123         cr->offset_end = csr->crc_len + 4;
1124
1125         csr->cache_head->filled_head = cr;
1126         csr->cache_head->filled_tail = cr;
1127
1128         return CSR1212_SUCCESS;
1129 }
1130
1131 #define CSR1212_KV_KEY(q)       (be32_to_cpu(q) >> CSR1212_KV_KEY_SHIFT)
1132 #define CSR1212_KV_KEY_TYPE(q)  (CSR1212_KV_KEY(q) >> CSR1212_KV_KEY_TYPE_SHIFT)
1133 #define CSR1212_KV_KEY_ID(q)    (CSR1212_KV_KEY(q) & CSR1212_KV_KEY_ID_MASK)
1134 #define CSR1212_KV_VAL_MASK     0xffffff
1135 #define CSR1212_KV_VAL(q)       (be32_to_cpu(q) & CSR1212_KV_VAL_MASK)
1136
1137 static int
1138 csr1212_parse_dir_entry(struct csr1212_keyval *dir, u32 ki, u32 kv_pos)
1139 {
1140         int ret = CSR1212_SUCCESS;
1141         struct csr1212_keyval *k = NULL;
1142         u32 offset;
1143         bool keep_keyval = true;
1144
1145         switch (CSR1212_KV_KEY_TYPE(ki)) {
1146         case CSR1212_KV_TYPE_IMMEDIATE:
1147                 k = csr1212_new_immediate(CSR1212_KV_KEY_ID(ki),
1148                                           CSR1212_KV_VAL(ki));
1149                 if (!k) {
1150                         ret = -ENOMEM;
1151                         goto out;
1152                 }
1153                 /* Don't keep local reference when parsing. */
1154                 keep_keyval = false;
1155                 break;
1156
1157         case CSR1212_KV_TYPE_CSR_OFFSET:
1158                 k = csr1212_new_csr_offset(CSR1212_KV_KEY_ID(ki),
1159                                            CSR1212_KV_VAL(ki));
1160                 if (!k) {
1161                         ret = -ENOMEM;
1162                         goto out;
1163                 }
1164                 /* Don't keep local reference when parsing. */
1165                 keep_keyval = false;
1166                 break;
1167
1168         default:
1169                 /* Compute the offset from 0xffff f000 0000. */
1170                 offset = quads_to_bytes(CSR1212_KV_VAL(ki)) + kv_pos;
1171                 if (offset == kv_pos) {
1172                         /* Uh-oh.  Can't have a relative offset of 0 for Leaves
1173                          * or Directories.  The Config ROM image is most likely
1174                          * messed up, so we'll just abort here. */
1175                         ret = -EIO;
1176                         goto out;
1177                 }
1178
1179                 k = csr1212_find_keyval_offset(dir, offset);
1180
1181                 if (k)
1182                         break;          /* Found it. */
1183
1184                 if (CSR1212_KV_KEY_TYPE(ki) == CSR1212_KV_TYPE_DIRECTORY)
1185                         k = csr1212_new_directory(CSR1212_KV_KEY_ID(ki));
1186                 else
1187                         k = csr1212_new_leaf(CSR1212_KV_KEY_ID(ki), NULL, 0);
1188
1189                 if (!k) {
1190                         ret = -ENOMEM;
1191                         goto out;
1192                 }
1193                 /* Don't keep local reference when parsing. */
1194                 keep_keyval = false;
1195                 /* Contents not read yet so it's not valid. */
1196                 k->valid = 0;
1197                 k->offset = offset;
1198
1199                 k->prev = dir;
1200                 k->next = dir->next;
1201                 dir->next->prev = k;
1202                 dir->next = k;
1203         }
1204         ret = __csr1212_attach_keyval_to_directory(dir, k, keep_keyval);
1205 out:
1206         if (ret != CSR1212_SUCCESS && k != NULL)
1207                 free_keyval(k);
1208         return ret;
1209 }
1210
1211 int csr1212_parse_keyval(struct csr1212_keyval *kv,
1212                          struct csr1212_csr_rom_cache *cache)
1213 {
1214         struct csr1212_keyval_img *kvi;
1215         int i;
1216         int ret = CSR1212_SUCCESS;
1217         int kvi_len;
1218
1219         kvi = (struct csr1212_keyval_img*)
1220                 &cache->data[bytes_to_quads(kv->offset - cache->offset)];
1221         kvi_len = be16_to_cpu(kvi->length);
1222
1223         /* GUID is wrong in here in case of extended ROM.  We don't care. */
1224         csr1212_check_crc(kvi->data, kvi_len, kvi->crc, &cache->data[3]);
1225
1226         switch (kv->key.type) {
1227         case CSR1212_KV_TYPE_DIRECTORY:
1228                 for (i = 0; i < kvi_len; i++) {
1229                         u32 ki = kvi->data[i];
1230
1231                         /* Some devices put null entries in their unit
1232                          * directories.  If we come across such an entry,
1233                          * then skip it. */
1234                         if (ki == 0x0)
1235                                 continue;
1236                         ret = csr1212_parse_dir_entry(kv, ki,
1237                                         kv->offset + quads_to_bytes(i + 1));
1238                 }
1239                 kv->value.directory.len = kvi_len;
1240                 break;
1241
1242         case CSR1212_KV_TYPE_LEAF:
1243                 if (kv->key.id != CSR1212_KV_ID_EXTENDED_ROM) {
1244                         size_t size = quads_to_bytes(kvi_len);
1245
1246                         kv->value.leaf.data = CSR1212_MALLOC(size);
1247                         if (!kv->value.leaf.data) {
1248                                 ret = -ENOMEM;
1249                                 goto out;
1250                         }
1251
1252                         kv->value.leaf.len = kvi_len;
1253                         memcpy(kv->value.leaf.data, kvi->data, size);
1254                 }
1255                 break;
1256         }
1257
1258         kv->valid = 1;
1259 out:
1260         return ret;
1261 }
1262
1263 static int
1264 csr1212_read_keyval(struct csr1212_csr *csr, struct csr1212_keyval *kv)
1265 {
1266         struct csr1212_cache_region *cr, *ncr, *newcr = NULL;
1267         struct csr1212_keyval_img *kvi = NULL;
1268         struct csr1212_csr_rom_cache *cache;
1269         int cache_index;
1270         u64 addr;
1271         u32 *cache_ptr;
1272         u16 kv_len = 0;
1273
1274         BUG_ON(!csr || !kv || csr->max_rom < 1);
1275
1276         /* First find which cache the data should be in (or go in if not read
1277          * yet). */
1278         for (cache = csr->cache_head; cache; cache = cache->next)
1279                 if (kv->offset >= cache->offset &&
1280                     kv->offset < (cache->offset + cache->size))
1281                         break;
1282
1283         if (!cache) {
1284                 u32 q, cache_size;
1285
1286                 /* Only create a new cache for Extended ROM leaves. */
1287                 if (kv->key.id != CSR1212_KV_ID_EXTENDED_ROM)
1288                         return -EINVAL;
1289
1290                 if (csr->ops->bus_read(csr,
1291                                        CSR1212_REGISTER_SPACE_BASE + kv->offset,
1292                                        sizeof(u32), &q, csr->private))
1293                         return -EIO;
1294
1295                 kv->value.leaf.len = be32_to_cpu(q) >> 16;
1296
1297                 cache_size = (quads_to_bytes(kv->value.leaf.len + 1) +
1298                               (csr->max_rom - 1)) & ~(csr->max_rom - 1);
1299
1300                 cache = csr1212_rom_cache_malloc(kv->offset, cache_size);
1301                 if (!cache)
1302                         return -ENOMEM;
1303
1304                 kv->value.leaf.data = &cache->data[1];
1305                 csr->cache_tail->next = cache;
1306                 cache->prev = csr->cache_tail;
1307                 cache->next = NULL;
1308                 csr->cache_tail = cache;
1309                 cache->filled_head =
1310                         CSR1212_MALLOC(sizeof(*cache->filled_head));
1311                 if (!cache->filled_head)
1312                         return -ENOMEM;
1313
1314                 cache->filled_head->offset_start = 0;
1315                 cache->filled_head->offset_end = sizeof(u32);
1316                 cache->filled_tail = cache->filled_head;
1317                 cache->filled_head->next = NULL;
1318                 cache->filled_head->prev = NULL;
1319                 cache->data[0] = q;
1320
1321                 /* Don't read the entire extended ROM now.  Pieces of it will
1322                  * be read when entries inside it are read. */
1323                 return csr1212_parse_keyval(kv, cache);
1324         }
1325
1326         cache_index = kv->offset - cache->offset;
1327
1328         /* Now seach read portions of the cache to see if it is there. */
1329         for (cr = cache->filled_head; cr; cr = cr->next) {
1330                 if (cache_index < cr->offset_start) {
1331                         newcr = CSR1212_MALLOC(sizeof(*newcr));
1332                         if (!newcr)
1333                                 return -ENOMEM;
1334
1335                         newcr->offset_start = cache_index & ~(csr->max_rom - 1);
1336                         newcr->offset_end = newcr->offset_start;
1337                         newcr->next = cr;
1338                         newcr->prev = cr->prev;
1339                         cr->prev = newcr;
1340                         cr = newcr;
1341                         break;
1342                 } else if ((cache_index >= cr->offset_start) &&
1343                            (cache_index < cr->offset_end)) {
1344                         kvi = (struct csr1212_keyval_img*)
1345                                 (&cache->data[bytes_to_quads(cache_index)]);
1346                         kv_len = quads_to_bytes(be16_to_cpu(kvi->length) + 1);
1347                         break;
1348                 } else if (cache_index == cr->offset_end) {
1349                         break;
1350                 }
1351         }
1352
1353         if (!cr) {
1354                 cr = cache->filled_tail;
1355                 newcr = CSR1212_MALLOC(sizeof(*newcr));
1356                 if (!newcr)
1357                         return -ENOMEM;
1358
1359                 newcr->offset_start = cache_index & ~(csr->max_rom - 1);
1360                 newcr->offset_end = newcr->offset_start;
1361                 newcr->prev = cr;
1362                 newcr->next = cr->next;
1363                 cr->next = newcr;
1364                 cr = newcr;
1365                 cache->filled_tail = newcr;
1366         }
1367
1368         while(!kvi || cr->offset_end < cache_index + kv_len) {
1369                 cache_ptr = &cache->data[bytes_to_quads(cr->offset_end &
1370                                                         ~(csr->max_rom - 1))];
1371
1372                 addr = (CSR1212_CSR_ARCH_REG_SPACE_BASE + cache->offset +
1373                         cr->offset_end) & ~(csr->max_rom - 1);
1374
1375                 if (csr->ops->bus_read(csr, addr, csr->max_rom, cache_ptr,
1376                                        csr->private)) {
1377                         if (csr->max_rom == 4)
1378                                 /* We've got problems! */
1379                                 return -EIO;
1380
1381                         /* Apperently the max_rom value was a lie, set it to
1382                          * do quadlet reads and try again. */
1383                         csr->max_rom = 4;
1384                         continue;
1385                 }
1386
1387                 cr->offset_end += csr->max_rom - (cr->offset_end &
1388                                                   (csr->max_rom - 1));
1389
1390                 if (!kvi && (cr->offset_end > cache_index)) {
1391                         kvi = (struct csr1212_keyval_img*)
1392                                 (&cache->data[bytes_to_quads(cache_index)]);
1393                         kv_len = quads_to_bytes(be16_to_cpu(kvi->length) + 1);
1394                 }
1395
1396                 if ((kv_len + (kv->offset - cache->offset)) > cache->size) {
1397                         /* The Leaf or Directory claims its length extends
1398                          * beyond the ConfigROM image region and thus beyond the
1399                          * end of our cache region.  Therefore, we abort now
1400                          * rather than seg faulting later. */
1401                         return -EIO;
1402                 }
1403
1404                 ncr = cr->next;
1405
1406                 if (ncr && (cr->offset_end >= ncr->offset_start)) {
1407                         /* consolidate region entries */
1408                         ncr->offset_start = cr->offset_start;
1409
1410                         if (cr->prev)
1411                                 cr->prev->next = cr->next;
1412                         ncr->prev = cr->prev;
1413                         if (cache->filled_head == cr)
1414                                 cache->filled_head = ncr;
1415                         CSR1212_FREE(cr);
1416                         cr = ncr;
1417                 }
1418         }
1419
1420         return csr1212_parse_keyval(kv, cache);
1421 }
1422
1423 struct csr1212_keyval *
1424 csr1212_get_keyval(struct csr1212_csr *csr, struct csr1212_keyval *kv)
1425 {
1426         if (!kv)
1427                 return NULL;
1428         if (!kv->valid)
1429                 if (csr1212_read_keyval(csr, kv) != CSR1212_SUCCESS)
1430                         return NULL;
1431         return kv;
1432 }
1433
1434 int csr1212_parse_csr(struct csr1212_csr *csr)
1435 {
1436         static const int mr_map[] = { 4, 64, 1024, 0 };
1437         struct csr1212_dentry *dentry;
1438         int ret;
1439
1440         BUG_ON(!csr || !csr->ops || !csr->ops->bus_read);
1441
1442         ret = csr1212_parse_bus_info_block(csr);
1443         if (ret != CSR1212_SUCCESS)
1444                 return ret;
1445
1446         if (!csr->ops->get_max_rom) {
1447                 csr->max_rom = mr_map[0];       /* default value */
1448         } else {
1449                 int i = csr->ops->get_max_rom(csr->bus_info_data,
1450                                               csr->private);
1451                 if (i & ~0x3)
1452                         return -EINVAL;
1453                 csr->max_rom = mr_map[i];
1454         }
1455
1456         csr->cache_head->layout_head = csr->root_kv;
1457         csr->cache_head->layout_tail = csr->root_kv;
1458
1459         csr->root_kv->offset = (CSR1212_CONFIG_ROM_SPACE_BASE & 0xffff) +
1460                 csr->bus_info_len;
1461
1462         csr->root_kv->valid = 0;
1463         csr->root_kv->next = csr->root_kv;
1464         csr->root_kv->prev = csr->root_kv;
1465         ret = csr1212_read_keyval(csr, csr->root_kv);
1466         if (ret != CSR1212_SUCCESS)
1467                 return ret;
1468
1469         /* Scan through the Root directory finding all extended ROM regions
1470          * and make cache regions for them */
1471         for (dentry = csr->root_kv->value.directory.dentries_head;
1472              dentry; dentry = dentry->next) {
1473                 if (dentry->kv->key.id == CSR1212_KV_ID_EXTENDED_ROM &&
1474                         !dentry->kv->valid) {
1475                         ret = csr1212_read_keyval(csr, dentry->kv);
1476                         if (ret != CSR1212_SUCCESS)
1477                                 return ret;
1478                 }
1479         }
1480
1481         return CSR1212_SUCCESS;
1482 }