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   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         kv->key.type = type;
 222         kv->key.id = key;
 223
 224         kv->associate = NULL;
 225         kv->refcnt = 1;
 226
 227         kv->next = NULL;
 228         kv->prev = NULL;
 229         kv->offset = 0;
 230         kv->valid = 0;
 231         return kv;
 232 }
 233
 234 struct csr1212_keyval *csr1212_new_immediate(u8 key, u32 value)
 235 {
 236         struct csr1212_keyval *kv;
 237
 238         kv = csr1212_new_keyval(CSR1212_KV_TYPE_IMMEDIATE, key);
 239         if (!kv)
 240                 return NULL;
 241
 242         kv->value.immediate = value;
 243         kv->valid = 1;
 244         return kv;
 245 }
 246
 247 static struct csr1212_keyval *
 248 csr1212_new_leaf(u8 key, const void *data, size_t data_len)
 249 {
 250         struct csr1212_keyval *kv;
 251
 252         kv = csr1212_new_keyval(CSR1212_KV_TYPE_LEAF, key);
 253         if (!kv)
 254                 return NULL;
 255
 256         if (data_len > 0) {
 257                 kv->value.leaf.data = CSR1212_MALLOC(data_len);
 258                 if (!kv->value.leaf.data) {
 259                         CSR1212_FREE(kv);
 260                         return NULL;
 261                 }
 262
 263                 if (data)
 264                         memcpy(kv->value.leaf.data, data, data_len);
 265         } else {
 266                 kv->value.leaf.data = NULL;
 267         }
 268
 269         kv->value.leaf.len = bytes_to_quads(data_len);
 270         kv->offset = 0;
 271         kv->valid = 1;
 272
 273         return kv;
 274 }
 275
 276 static struct csr1212_keyval *
 277 csr1212_new_csr_offset(u8 key, u32 csr_offset)
 278 {
 279         struct csr1212_keyval *kv;
 280
 281         kv = csr1212_new_keyval(CSR1212_KV_TYPE_CSR_OFFSET, key);
 282         if (!kv)
 283                 return NULL;
 284
 285         kv->value.csr_offset = csr_offset;
 286
 287         kv->offset = 0;
 288         kv->valid = 1;
 289         return kv;
 290 }
 291
 292 struct csr1212_keyval *csr1212_new_directory(u8 key)
 293 {
 294         struct csr1212_keyval *kv;
 295
 296         kv = csr1212_new_keyval(CSR1212_KV_TYPE_DIRECTORY, key);
 297         if (!kv)
 298                 return NULL;
 299
 300         kv->value.directory.len = 0;
 301         kv->offset = 0;
 302         kv->value.directory.dentries_head = NULL;
 303         kv->value.directory.dentries_tail = NULL;
 304         kv->valid = 1;
 305         return kv;
 306 }
 307
 308 void csr1212_associate_keyval(struct csr1212_keyval *kv,
 309                               struct csr1212_keyval *associate)
 310 {
 311         BUG_ON(!kv || !associate || kv->key.id == CSR1212_KV_ID_DESCRIPTOR ||
 312                (associate->key.id != CSR1212_KV_ID_DESCRIPTOR &&
 313                 associate->key.id != CSR1212_KV_ID_DEPENDENT_INFO &&
 314                 associate->key.id != CSR1212_KV_ID_EXTENDED_KEY &&
 315                 associate->key.id != CSR1212_KV_ID_EXTENDED_DATA &&
 316                 associate->key.id < 0x30) ||
 317                (kv->key.id == CSR1212_KV_ID_EXTENDED_KEY_SPECIFIER_ID &&
 318                 associate->key.id != CSR1212_KV_ID_EXTENDED_KEY) ||
 319                (kv->key.id == CSR1212_KV_ID_EXTENDED_KEY &&
 320                 associate->key.id != CSR1212_KV_ID_EXTENDED_DATA) ||
 321                (associate->key.id == CSR1212_KV_ID_EXTENDED_KEY &&
 322                 kv->key.id != CSR1212_KV_ID_EXTENDED_KEY_SPECIFIER_ID) ||
 323                (associate->key.id == CSR1212_KV_ID_EXTENDED_DATA &&
 324                 kv->key.id != CSR1212_KV_ID_EXTENDED_KEY));
 325
 326         if (kv->associate)
 327                 csr1212_release_keyval(kv->associate);
 328
 329         associate->refcnt++;
 330         kv->associate = associate;
 331 }
 332
 333 int csr1212_attach_keyval_to_directory(struct csr1212_keyval *dir,
 334                                        struct csr1212_keyval *kv)
 335 {
 336         struct csr1212_dentry *dentry;
 337
 338         BUG_ON(!kv || !dir || dir->key.type != CSR1212_KV_TYPE_DIRECTORY);
 339
 340         dentry = CSR1212_MALLOC(sizeof(*dentry));
 341         if (!dentry)
 342                 return -ENOMEM;
 343
 344         dentry->kv = kv;
 345
 346         kv->refcnt++;
 347
 348         dentry->next = NULL;
 349         dentry->prev = dir->value.directory.dentries_tail;
 350
 351         if (!dir->value.directory.dentries_head)
 352                 dir->value.directory.dentries_head = dentry;
 353
 354         if (dir->value.directory.dentries_tail)
 355                 dir->value.directory.dentries_tail->next = dentry;
 356         dir->value.directory.dentries_tail = dentry;
 357
 358         return CSR1212_SUCCESS;
 359 }
 360
 361 #define CSR1212_DESCRIPTOR_LEAF_DATA(kv) \
 362         (&((kv)->value.leaf.data[1]))
 363
 364 #define CSR1212_DESCRIPTOR_LEAF_SET_TYPE(kv, type) \
 365         ((kv)->value.leaf.data[0] = \
 366          cpu_to_be32(CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) | \
 367                      ((type) << CSR1212_DESCRIPTOR_LEAF_TYPE_SHIFT)))
 368 #define CSR1212_DESCRIPTOR_LEAF_SET_SPECIFIER_ID(kv, spec_id) \
 369         ((kv)->value.leaf.data[0] = \
 370          cpu_to_be32((CSR1212_DESCRIPTOR_LEAF_TYPE(kv) << \
 371                       CSR1212_DESCRIPTOR_LEAF_TYPE_SHIFT) | \
 372                      ((spec_id) & CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID_MASK)))
 373
 374 static struct csr1212_keyval *
 375 csr1212_new_descriptor_leaf(u8 dtype, u32 specifier_id,
 376                             const void *data, size_t data_len)
 377 {
 378         struct csr1212_keyval *kv;
 379
 380         kv = csr1212_new_leaf(CSR1212_KV_ID_DESCRIPTOR, NULL,
 381                               data_len + CSR1212_DESCRIPTOR_LEAF_OVERHEAD);
 382         if (!kv)
 383                 return NULL;
 384
 385         CSR1212_DESCRIPTOR_LEAF_SET_TYPE(kv, dtype);
 386         CSR1212_DESCRIPTOR_LEAF_SET_SPECIFIER_ID(kv, specifier_id);
 387
 388         if (data)
 389                 memcpy(CSR1212_DESCRIPTOR_LEAF_DATA(kv), data, data_len);
 390
 391         return kv;
 392 }
 393
 394 /* Check if string conforms to minimal ASCII as per IEEE 1212 clause 7.4 */
 395 static int csr1212_check_minimal_ascii(const char *s)
 396 {
 397         static const char minimal_ascii_table[] = {
 398                                         /*  1   2   4   8  16  32  64  128 */
 399                 128,                    /* --, --, --, --, --, --, --, 07, */
 400                 4 + 16 + 32,            /* --, --, 0a, --, 0C, 0D, --, --, */
 401                 0,                      /* --, --, --, --, --, --, --, --, */
 402                 0,                      /* --, --, --, --, --, --, --, --, */
 403                 255 - 8 - 16,           /* 20, 21, 22, --, --, 25, 26, 27, */
 404                 255,                    /* 28, 29, 2a, 2b, 2c, 2d, 2e, 2f, */
 405                 255,                    /* 30, 31, 32, 33, 34, 35, 36, 37, */
 406                 255,                    /* 38, 39, 3a, 3b, 3c, 3d, 3e, 3f, */
 407                 255,                    /* 40, 41, 42, 43, 44, 45, 46, 47, */
 408                 255,                    /* 48, 49, 4a, 4b, 4c, 4d, 4e, 4f, */
 409                 255,                    /* 50, 51, 52, 53, 54, 55, 56, 57, */
 410                 1 + 2 + 4 + 128,        /* 58, 59, 5a, --, --, --, --, 5f, */
 411                 255 - 1,                /* --, 61, 62, 63, 64, 65, 66, 67, */
 412                 255,                    /* 68, 69, 6a, 6b, 6c, 6d, 6e, 6f, */
 413                 255,                    /* 70, 71, 72, 73, 74, 75, 76, 77, */
 414                 1 + 2 + 4,              /* 78, 79, 7a, --, --, --, --, --, */
 415         };
 416         int i, j;
 417
 418         for (; *s; s++) {
 419                 i = *s >> 3;            /*  i = *s / 8;         */
 420                 j = 1 << (*s & 3);      /*  j = 1 << (*s % 8);  */
 421
 422                 if (i >= ARRAY_SIZE(minimal_ascii_table) ||
 423                     !(minimal_ascii_table[i] & j))
 424                         return -EINVAL;
 425         }
 426         return 0;
 427 }
 428
 429 /* IEEE 1212 clause 7.5.4.1 textual descriptors (English, minimal ASCII) */
 430 struct csr1212_keyval *csr1212_new_string_descriptor_leaf(const char *s)
 431 {
 432         struct csr1212_keyval *kv;
 433         u32 *text;
 434         size_t str_len, quads;
 435
 436         if (!s || !*s || csr1212_check_minimal_ascii(s))
 437                 return NULL;
 438
 439         str_len = strlen(s);
 440         quads = bytes_to_quads(str_len);
 441         kv = csr1212_new_descriptor_leaf(0, 0, NULL, quads_to_bytes(quads) +
 442                                       CSR1212_TEXTUAL_DESCRIPTOR_LEAF_OVERHEAD);
 443         if (!kv)
 444                 return NULL;
 445
 446         kv->value.leaf.data[1] = 0;     /* width, character_set, language */
 447         text = CSR1212_TEXTUAL_DESCRIPTOR_LEAF_DATA(kv);
 448         text[quads - 1] = 0;            /* padding */
 449         memcpy(text, s, str_len);
 450
 451         return kv;
 452 }
 453
 454
 455 /* Destruction Routines */
 456
 457 void csr1212_detach_keyval_from_directory(struct csr1212_keyval *dir,
 458                                           struct csr1212_keyval *kv)
 459 {
 460         struct csr1212_dentry *dentry;
 461
 462         if (!kv || !dir || dir->key.type != CSR1212_KV_TYPE_DIRECTORY)
 463                 return;
 464
 465         dentry = csr1212_find_keyval(dir, kv);
 466
 467         if (!dentry)
 468                 return;
 469
 470         if (dentry->prev)
 471                 dentry->prev->next = dentry->next;
 472         if (dentry->next)
 473                 dentry->next->prev = dentry->prev;
 474         if (dir->value.directory.dentries_head == dentry)
 475                 dir->value.directory.dentries_head = dentry->next;
 476         if (dir->value.directory.dentries_tail == dentry)
 477                 dir->value.directory.dentries_tail = dentry->prev;
 478
 479         CSR1212_FREE(dentry);
 480
 481         csr1212_release_keyval(kv);
 482 }
 483
 484 /* This function is used to free the memory taken by a keyval.  If the given
 485  * keyval is a directory type, then any keyvals contained in that directory
 486  * will be destroyed as well if their respective refcnts are 0.  By means of
 487  * list manipulation, this routine will descend a directory structure in a
 488  * non-recursive manner. */
 489 static void csr1212_destroy_keyval(struct csr1212_keyval *kv)
 490 {
 491         struct csr1212_keyval *k, *a;
 492         struct csr1212_dentry dentry;
 493         struct csr1212_dentry *head, *tail;
 494
 495         dentry.kv = kv;
 496         dentry.next = NULL;
 497         dentry.prev = NULL;
 498
 499         head = &dentry;
 500         tail = head;
 501
 502         while (head) {
 503                 k = head->kv;
 504
 505                 while (k) {
 506                         k->refcnt--;
 507
 508                         if (k->refcnt > 0)
 509                                 break;
 510
 511                         a = k->associate;
 512
 513                         if (k->key.type == CSR1212_KV_TYPE_DIRECTORY) {
 514                                 /* If the current entry is a directory, move all
 515                                  * the entries to the destruction list. */
 516                                 if (k->value.directory.dentries_head) {
 517                                         tail->next =
 518                                             k->value.directory.dentries_head;
 519                                         k->value.directory.dentries_head->prev =
 520                                             tail;
 521                                         tail = k->value.directory.dentries_tail;
 522                                 }
 523                         }
 524                         free_keyval(k);
 525                         k = a;
 526                 }
 527
 528                 head = head->next;
 529                 if (head) {
 530                         if (head->prev && head->prev != &dentry)
 531                                 CSR1212_FREE(head->prev);
 532                         head->prev = NULL;
 533                 } else if (tail != &dentry) {
 534                         CSR1212_FREE(tail);
 535                 }
 536         }
 537 }
 538
 539 void csr1212_release_keyval(struct csr1212_keyval *kv)
 540 {
 541         if (kv->refcnt > 1)
 542                 kv->refcnt--;
 543         else
 544                 csr1212_destroy_keyval(kv);
 545 }
 546
 547 void csr1212_destroy_csr(struct csr1212_csr *csr)
 548 {
 549         struct csr1212_csr_rom_cache *c, *oc;
 550         struct csr1212_cache_region *cr, *ocr;
 551
 552         csr1212_release_keyval(csr->root_kv);
 553
 554         c = csr->cache_head;
 555         while (c) {
 556                 oc = c;
 557                 cr = c->filled_head;
 558                 while (cr) {
 559                         ocr = cr;
 560                         cr = cr->next;
 561                         CSR1212_FREE(ocr);
 562                 }
 563                 c = c->next;
 564                 CSR1212_FREE(oc);
 565         }
 566
 567         CSR1212_FREE(csr);
 568 }
 569
 570
 571 /* CSR Image Creation */
 572
 573 static int csr1212_append_new_cache(struct csr1212_csr *csr, size_t romsize)
 574 {
 575         struct csr1212_csr_rom_cache *cache;
 576         u64 csr_addr;
 577
 578         BUG_ON(!csr || !csr->ops || !csr->ops->allocate_addr_range ||
 579                !csr->ops->release_addr || csr->max_rom < 1);
 580
 581         /* ROM size must be a multiple of csr->max_rom */
 582         romsize = (romsize + (csr->max_rom - 1)) & ~(csr->max_rom - 1);
 583
 584         csr_addr = csr->ops->allocate_addr_range(romsize, csr->max_rom,
 585                                                  csr->private);
 586         if (csr_addr == CSR1212_INVALID_ADDR_SPACE)
 587                 return -ENOMEM;
 588
 589         if (csr_addr < CSR1212_REGISTER_SPACE_BASE) {
 590                 /* Invalid address returned from allocate_addr_range(). */
 591                 csr->ops->release_addr(csr_addr, csr->private);
 592                 return -ENOMEM;
 593         }
 594
 595         cache = csr1212_rom_cache_malloc(csr_addr - CSR1212_REGISTER_SPACE_BASE,
 596                                          romsize);
 597         if (!cache) {
 598                 csr->ops->release_addr(csr_addr, csr->private);
 599                 return -ENOMEM;
 600         }
 601
 602         cache->ext_rom = csr1212_new_keyval(CSR1212_KV_TYPE_LEAF,
 603                                             CSR1212_KV_ID_EXTENDED_ROM);
 604         if (!cache->ext_rom) {
 605                 csr->ops->release_addr(csr_addr, csr->private);
 606                 CSR1212_FREE(cache);
 607                 return -ENOMEM;
 608         }
 609
 610         if (csr1212_attach_keyval_to_directory(csr->root_kv, cache->ext_rom) !=
 611             CSR1212_SUCCESS) {
 612                 csr1212_release_keyval(cache->ext_rom);
 613                 csr->ops->release_addr(csr_addr, csr->private);
 614                 CSR1212_FREE(cache);
 615                 return -ENOMEM;
 616         }
 617         cache->ext_rom->offset = csr_addr - CSR1212_REGISTER_SPACE_BASE;
 618         cache->ext_rom->value.leaf.len = -1;
 619         cache->ext_rom->value.leaf.data = cache->data;
 620
 621         /* Add cache to tail of cache list */
 622         cache->prev = csr->cache_tail;
 623         csr->cache_tail->next = cache;
 624         csr->cache_tail = cache;
 625         return CSR1212_SUCCESS;
 626 }
 627
 628 static void csr1212_remove_cache(struct csr1212_csr *csr,
 629                                  struct csr1212_csr_rom_cache *cache)
 630 {
 631         if (csr->cache_head == cache)
 632                 csr->cache_head = cache->next;
 633         if (csr->cache_tail == cache)
 634                 csr->cache_tail = cache->prev;
 635
 636         if (cache->prev)
 637                 cache->prev->next = cache->next;
 638         if (cache->next)
 639                 cache->next->prev = cache->prev;
 640
 641         if (cache->ext_rom) {
 642                 csr1212_detach_keyval_from_directory(csr->root_kv,
 643                                                      cache->ext_rom);
 644                 csr1212_release_keyval(cache->ext_rom);
 645         }
 646
 647         CSR1212_FREE(cache);
 648 }
 649
 650 static int csr1212_generate_layout_subdir(struct csr1212_keyval *dir,
 651                                           struct csr1212_keyval **layout_tail)
 652 {
 653         struct csr1212_dentry *dentry;
 654         struct csr1212_keyval *dkv;
 655         struct csr1212_keyval *last_extkey_spec = NULL;
 656         struct csr1212_keyval *last_extkey = NULL;
 657         int num_entries = 0;
 658
 659         for (dentry = dir->value.directory.dentries_head; dentry;
 660              dentry = dentry->next) {
 661                 for (dkv = dentry->kv; dkv; dkv = dkv->associate) {
 662                         /* Special Case: Extended Key Specifier_ID */
 663                         if (dkv->key.id ==
 664                             CSR1212_KV_ID_EXTENDED_KEY_SPECIFIER_ID) {
 665                                 if (last_extkey_spec == NULL)
 666                                         last_extkey_spec = dkv;
 667                                 else if (dkv->value.immediate !=
 668                                          last_extkey_spec->value.immediate)
 669                                         last_extkey_spec = dkv;
 670                                 else
 671                                         continue;
 672                         /* Special Case: Extended Key */
 673                         } else if (dkv->key.id == CSR1212_KV_ID_EXTENDED_KEY) {
 674                                 if (last_extkey == NULL)
 675                                         last_extkey = dkv;
 676                                 else if (dkv->value.immediate !=
 677                                          last_extkey->value.immediate)
 678                                         last_extkey = dkv;
 679                                 else
 680                                         continue;
 681                         }
 682
 683                         num_entries += 1;
 684
 685                         switch (dkv->key.type) {
 686                         default:
 687                         case CSR1212_KV_TYPE_IMMEDIATE:
 688                         case CSR1212_KV_TYPE_CSR_OFFSET:
 689                                 break;
 690                         case CSR1212_KV_TYPE_LEAF:
 691                         case CSR1212_KV_TYPE_DIRECTORY:
 692                                 /* Remove from list */
 693                                 if (dkv->prev && (dkv->prev->next == dkv))
 694                                         dkv->prev->next = dkv->next;
 695                                 if (dkv->next && (dkv->next->prev == dkv))
 696                                         dkv->next->prev = dkv->prev;
 697                                 //if (dkv == *layout_tail)
 698                                 //      *layout_tail = dkv->prev;
 699
 700                                 /* Special case: Extended ROM leafs */
 701                                 if (dkv->key.id == CSR1212_KV_ID_EXTENDED_ROM) {
 702                                         dkv->value.leaf.len = -1;
 703                                         /* Don't add Extended ROM leafs in the
 704                                          * layout list, they are handled
 705                                          * differently. */
 706                                         break;
 707                                 }
 708
 709                                 /* Add to tail of list */
 710                                 dkv->next = NULL;
 711                                 dkv->prev = *layout_tail;
 712                                 (*layout_tail)->next = dkv;
 713                                 *layout_tail = dkv;
 714                                 break;
 715                         }
 716                 }
 717         }
 718         return num_entries;
 719 }
 720
 721 static size_t csr1212_generate_layout_order(struct csr1212_keyval *kv)
 722 {
 723         struct csr1212_keyval *ltail = kv;
 724         size_t agg_size = 0;
 725
 726         while (kv) {
 727                 switch (kv->key.type) {
 728                 case CSR1212_KV_TYPE_LEAF:
 729                         /* Add 1 quadlet for crc/len field */
 730                         agg_size += kv->value.leaf.len + 1;
 731                         break;
 732
 733                 case CSR1212_KV_TYPE_DIRECTORY:
 734                         kv->value.directory.len =
 735                                 csr1212_generate_layout_subdir(kv, &ltail);
 736                         /* Add 1 quadlet for crc/len field */
 737                         agg_size += kv->value.directory.len + 1;
 738                         break;
 739                 }
 740                 kv = kv->next;
 741         }
 742         return quads_to_bytes(agg_size);
 743 }
 744
 745 static struct csr1212_keyval *
 746 csr1212_generate_positions(struct csr1212_csr_rom_cache *cache,
 747                            struct csr1212_keyval *start_kv, int start_pos)
 748 {
 749         struct csr1212_keyval *kv = start_kv;
 750         struct csr1212_keyval *okv = start_kv;
 751         int pos = start_pos;
 752         int kv_len = 0, okv_len = 0;
 753
 754         cache->layout_head = kv;
 755
 756         while (kv && pos < cache->size) {
 757                 /* Special case: Extended ROM leafs */
 758                 if (kv->key.id != CSR1212_KV_ID_EXTENDED_ROM)
 759                         kv->offset = cache->offset + pos;
 760
 761                 switch (kv->key.type) {
 762                 case CSR1212_KV_TYPE_LEAF:
 763                         kv_len = kv->value.leaf.len;
 764                         break;
 765
 766                 case CSR1212_KV_TYPE_DIRECTORY:
 767                         kv_len = kv->value.directory.len;
 768                         break;
 769
 770                 default:
 771                         /* Should never get here */
 772                         WARN_ON(1);
 773                         break;
 774                 }
 775
 776                 pos += quads_to_bytes(kv_len + 1);
 777
 778                 if (pos <= cache->size) {
 779                         okv = kv;
 780                         okv_len = kv_len;
 781                         kv = kv->next;
 782                 }
 783         }
 784
 785         cache->layout_tail = okv;
 786         cache->len = okv->offset - cache->offset + quads_to_bytes(okv_len + 1);
 787
 788         return kv;
 789 }
 790
 791 #define CSR1212_KV_KEY_SHIFT            24
 792 #define CSR1212_KV_KEY_TYPE_SHIFT       6
 793 #define CSR1212_KV_KEY_ID_MASK          0x3f
 794 #define CSR1212_KV_KEY_TYPE_MASK        0x3     /* after shift */
 795
 796 static void
 797 csr1212_generate_tree_subdir(struct csr1212_keyval *dir, u32 *data_buffer)
 798 {
 799         struct csr1212_dentry *dentry;
 800         struct csr1212_keyval *last_extkey_spec = NULL;
 801         struct csr1212_keyval *last_extkey = NULL;
 802         int index = 0;
 803
 804         for (dentry = dir->value.directory.dentries_head;
 805              dentry;
 806              dentry = dentry->next) {
 807                 struct csr1212_keyval *a;
 808
 809                 for (a = dentry->kv; a; a = a->associate) {
 810                         u32 value = 0;
 811
 812                         /* Special Case: Extended Key Specifier_ID */
 813                         if (a->key.id ==
 814                             CSR1212_KV_ID_EXTENDED_KEY_SPECIFIER_ID) {
 815                                 if (last_extkey_spec == NULL)
 816                                         last_extkey_spec = a;
 817                                 else if (a->value.immediate !=
 818                                          last_extkey_spec->value.immediate)
 819                                         last_extkey_spec = a;
 820                                 else
 821                                         continue;
 822
 823                         /* Special Case: Extended Key */
 824                         } else if (a->key.id == CSR1212_KV_ID_EXTENDED_KEY) {
 825                                 if (last_extkey == NULL)
 826                                         last_extkey = a;
 827                                 else if (a->value.immediate !=
 828                                          last_extkey->value.immediate)
 829                                         last_extkey = a;
 830                                 else
 831                                         continue;
 832                         }
 833
 834                         switch (a->key.type) {
 835                         case CSR1212_KV_TYPE_IMMEDIATE:
 836                                 value = a->value.immediate;
 837                                 break;
 838                         case CSR1212_KV_TYPE_CSR_OFFSET:
 839                                 value = a->value.csr_offset;
 840                                 break;
 841                         case CSR1212_KV_TYPE_LEAF:
 842                                 value = a->offset;
 843                                 value -= dir->offset + quads_to_bytes(1+index);
 844                                 value = bytes_to_quads(value);
 845                                 break;
 846                         case CSR1212_KV_TYPE_DIRECTORY:
 847                                 value = a->offset;
 848                                 value -= dir->offset + quads_to_bytes(1+index);
 849                                 value = bytes_to_quads(value);
 850                                 break;
 851                         default:
 852                                 /* Should never get here */
 853                                 WARN_ON(1);
 854                                 break;
 855                         }
 856
 857                         value |= (a->key.id & CSR1212_KV_KEY_ID_MASK) <<
 858                                  CSR1212_KV_KEY_SHIFT;
 859                         value |= (a->key.type & CSR1212_KV_KEY_TYPE_MASK) <<
 860                                  (CSR1212_KV_KEY_SHIFT +
 861                                   CSR1212_KV_KEY_TYPE_SHIFT);
 862                         data_buffer[index] = cpu_to_be32(value);
 863                         index++;
 864                 }
 865         }
 866 }
 867
 868 struct csr1212_keyval_img {
 869         u16 length;
 870         u16 crc;
 871
 872         /* Must be last */
 873         u32 data[0];    /* older gcc can't handle [] which is standard */
 874 };
 875
 876 static void csr1212_fill_cache(struct csr1212_csr_rom_cache *cache)
 877 {
 878         struct csr1212_keyval *kv, *nkv;
 879         struct csr1212_keyval_img *kvi;
 880
 881         for (kv = cache->layout_head;
 882              kv != cache->layout_tail->next;
 883              kv = nkv) {
 884                 kvi = (struct csr1212_keyval_img *)(cache->data +
 885                                 bytes_to_quads(kv->offset - cache->offset));
 886                 switch (kv->key.type) {
 887                 default:
 888                 case CSR1212_KV_TYPE_IMMEDIATE:
 889                 case CSR1212_KV_TYPE_CSR_OFFSET:
 890                         /* Should never get here */
 891                         WARN_ON(1);
 892                         break;
 893
 894                 case CSR1212_KV_TYPE_LEAF:
 895                         /* Don't copy over Extended ROM areas, they are
 896                          * already filled out! */
 897                         if (kv->key.id != CSR1212_KV_ID_EXTENDED_ROM)
 898                                 memcpy(kvi->data, kv->value.leaf.data,
 899                                        quads_to_bytes(kv->value.leaf.len));
 900
 901                         kvi->length = cpu_to_be16(kv->value.leaf.len);
 902                         kvi->crc = csr1212_crc16(kvi->data, kv->value.leaf.len);
 903                         break;
 904
 905                 case CSR1212_KV_TYPE_DIRECTORY:
 906                         csr1212_generate_tree_subdir(kv, kvi->data);
 907
 908                         kvi->length = cpu_to_be16(kv->value.directory.len);
 909                         kvi->crc = csr1212_crc16(kvi->data,
 910                                                  kv->value.directory.len);
 911                         break;
 912                 }
 913
 914                 nkv = kv->next;
 915                 if (kv->prev)
 916                         kv->prev->next = NULL;
 917                 if (kv->next)
 918                         kv->next->prev = NULL;
 919                 kv->prev = NULL;
 920                 kv->next = NULL;
 921         }
 922 }
 923
 924 /* This size is arbitrarily chosen.
 925  * The struct overhead is subtracted for more economic allocations. */
 926 #define CSR1212_EXTENDED_ROM_SIZE (2048 - sizeof(struct csr1212_csr_rom_cache))
 927
 928 int csr1212_generate_csr_image(struct csr1212_csr *csr)
 929 {
 930         struct csr1212_bus_info_block_img *bi;
 931         struct csr1212_csr_rom_cache *cache;
 932         struct csr1212_keyval *kv;
 933         size_t agg_size;
 934         int ret;
 935         int init_offset;
 936
 937         BUG_ON(!csr);
 938
 939         cache = csr->cache_head;
 940
 941         bi = (struct csr1212_bus_info_block_img*)cache->data;
 942
 943         bi->length = bytes_to_quads(csr->bus_info_len) - 1;
 944         bi->crc_length = bi->length;
 945         bi->crc = csr1212_crc16(bi->data, bi->crc_length);
 946
 947         csr->root_kv->next = NULL;
 948         csr->root_kv->prev = NULL;
 949
 950         agg_size = csr1212_generate_layout_order(csr->root_kv);
 951
 952         init_offset = csr->bus_info_len;
 953
 954         for (kv = csr->root_kv, cache = csr->cache_head;
 955              kv;
 956              cache = cache->next) {
 957                 if (!cache) {
 958                         /* Estimate approximate number of additional cache
 959                          * regions needed (it assumes that the cache holding
 960                          * the first 1K Config ROM space always exists). */
 961                         int est_c = agg_size / (CSR1212_EXTENDED_ROM_SIZE -
 962                                                 (2 * sizeof(u32))) + 1;
 963
 964                         /* Add additional cache regions, extras will be
 965                          * removed later */
 966                         for (; est_c; est_c--) {
 967                                 ret = csr1212_append_new_cache(csr,
 968                                                 CSR1212_EXTENDED_ROM_SIZE);
 969                                 if (ret != CSR1212_SUCCESS)
 970                                         return ret;
 971                         }
 972                         /* Need to re-layout for additional cache regions */
 973                         agg_size = csr1212_generate_layout_order(csr->root_kv);
 974                         kv = csr->root_kv;
 975                         cache = csr->cache_head;
 976                         init_offset = csr->bus_info_len;
 977                 }
 978                 kv = csr1212_generate_positions(cache, kv, init_offset);
 979                 agg_size -= cache->len;
 980                 init_offset = sizeof(u32);
 981         }
 982
 983         /* Remove unused, excess cache regions */
 984         while (cache) {
 985                 struct csr1212_csr_rom_cache *oc = cache;
 986
 987                 cache = cache->next;
 988                 csr1212_remove_cache(csr, oc);
 989         }
 990
 991         /* Go through the list backward so that when done, the correct CRC
 992          * will be calculated for the Extended ROM areas. */
 993         for (cache = csr->cache_tail; cache; cache = cache->prev) {
 994                 /* Only Extended ROM caches should have this set. */
 995                 if (cache->ext_rom) {
 996                         int leaf_size;
 997
 998                         /* Make sure the Extended ROM leaf is a multiple of
 999                          * max_rom in size. */
1000                         BUG_ON(csr->max_rom < 1);
1001                         leaf_size = (cache->len + (csr->max_rom - 1)) &
1002                                 ~(csr->max_rom - 1);
1003
1004                         /* Zero out the unused ROM region */
1005                         memset(cache->data + bytes_to_quads(cache->len), 0x00,
1006                                leaf_size - cache->len);
1007
1008                         /* Subtract leaf header */
1009                         leaf_size -= sizeof(u32);
1010
1011                         /* Update the Extended ROM leaf length */
1012                         cache->ext_rom->value.leaf.len =
1013                                 bytes_to_quads(leaf_size);
1014                 } else {
1015                         /* Zero out the unused ROM region */
1016                         memset(cache->data + bytes_to_quads(cache->len), 0x00,
1017                                cache->size - cache->len);
1018                 }
1019
1020                 /* Copy the data into the cache buffer */
1021                 csr1212_fill_cache(cache);
1022
1023                 if (cache != csr->cache_head) {
1024                         /* Set the length and CRC of the extended ROM. */
1025                         struct csr1212_keyval_img *kvi =
1026                                 (struct csr1212_keyval_img*)cache->data;
1027                         u16 len = bytes_to_quads(cache->len) - 1;
1028
1029                         kvi->length = cpu_to_be16(len);
1030                         kvi->crc = csr1212_crc16(kvi->data, len);
1031                 }
1032         }
1033
1034         return CSR1212_SUCCESS;
1035 }
1036
1037 int csr1212_read(struct csr1212_csr *csr, u32 offset, void *buffer, u32 len)
1038 {
1039         struct csr1212_csr_rom_cache *cache;
1040
1041         for (cache = csr->cache_head; cache; cache = cache->next)
1042                 if (offset >= cache->offset &&
1043                     (offset + len) <= (cache->offset + cache->size)) {
1044                         memcpy(buffer, &cache->data[
1045                                         bytes_to_quads(offset - cache->offset)],
1046                                len);
1047                         return CSR1212_SUCCESS;
1048                 }
1049
1050         return -ENOENT;
1051 }
1052
1053
1054 /* Parse a chunk of data as a Config ROM */
1055
1056 static int csr1212_parse_bus_info_block(struct csr1212_csr *csr)
1057 {
1058         struct csr1212_bus_info_block_img *bi;
1059         struct csr1212_cache_region *cr;
1060         int i;
1061         int ret;
1062
1063         /* IEEE 1212 says that the entire bus info block should be readable in
1064          * a single transaction regardless of the max_rom value.
1065          * Unfortunately, many IEEE 1394 devices do not abide by that, so the
1066          * bus info block will be read 1 quadlet at a time.  The rest of the
1067          * ConfigROM will be read according to the max_rom field. */
1068         for (i = 0; i < csr->bus_info_len; i += sizeof(u32)) {
1069                 ret = csr->ops->bus_read(csr, CSR1212_CONFIG_ROM_SPACE_BASE + i,
1070                         sizeof(u32), &csr->cache_head->data[bytes_to_quads(i)],
1071                         csr->private);
1072                 if (ret != CSR1212_SUCCESS)
1073                         return ret;
1074
1075                 /* check ROM header's info_length */
1076                 if (i == 0 &&
1077                     be32_to_cpu(csr->cache_head->data[0]) >> 24 !=
1078                     bytes_to_quads(csr->bus_info_len) - 1)
1079                         return -EINVAL;
1080         }
1081
1082         bi = (struct csr1212_bus_info_block_img*)csr->cache_head->data;
1083         csr->crc_len = quads_to_bytes(bi->crc_length);
1084
1085         /* IEEE 1212 recommends that crc_len be equal to bus_info_len, but that
1086          * is not always the case, so read the rest of the crc area 1 quadlet at
1087          * a time. */
1088         for (i = csr->bus_info_len; i <= csr->crc_len; i += sizeof(u32)) {
1089                 ret = csr->ops->bus_read(csr, CSR1212_CONFIG_ROM_SPACE_BASE + i,
1090                         sizeof(u32), &csr->cache_head->data[bytes_to_quads(i)],
1091                         csr->private);
1092                 if (ret != CSR1212_SUCCESS)
1093                         return ret;
1094         }
1095
1096         /* Apparently there are many different wrong implementations of the CRC
1097          * algorithm.  We don't fail, we just warn. */
1098         if ((csr1212_crc16(bi->data, bi->crc_length) != bi->crc) &&
1099             (csr1212_msft_crc16(bi->data, bi->crc_length) != bi->crc))
1100                 printk(KERN_DEBUG "IEEE 1394 device has ROM CRC error\n");
1101
1102         cr = CSR1212_MALLOC(sizeof(*cr));
1103         if (!cr)
1104                 return -ENOMEM;
1105
1106         cr->next = NULL;
1107         cr->prev = NULL;
1108         cr->offset_start = 0;
1109         cr->offset_end = csr->crc_len + 4;
1110
1111         csr->cache_head->filled_head = cr;
1112         csr->cache_head->filled_tail = cr;
1113
1114         return CSR1212_SUCCESS;
1115 }
1116
1117 #define CSR1212_KV_KEY(q)       (be32_to_cpu(q) >> CSR1212_KV_KEY_SHIFT)
1118 #define CSR1212_KV_KEY_TYPE(q)  (CSR1212_KV_KEY(q) >> CSR1212_KV_KEY_TYPE_SHIFT)
1119 #define CSR1212_KV_KEY_ID(q)    (CSR1212_KV_KEY(q) & CSR1212_KV_KEY_ID_MASK)
1120 #define CSR1212_KV_VAL_MASK     0xffffff
1121 #define CSR1212_KV_VAL(q)       (be32_to_cpu(q) & CSR1212_KV_VAL_MASK)
1122
1123 static int
1124 csr1212_parse_dir_entry(struct csr1212_keyval *dir, u32 ki, u32 kv_pos)
1125 {
1126         int ret = CSR1212_SUCCESS;
1127         struct csr1212_keyval *k = NULL;
1128         u32 offset;
1129
1130         switch (CSR1212_KV_KEY_TYPE(ki)) {
1131         case CSR1212_KV_TYPE_IMMEDIATE:
1132                 k = csr1212_new_immediate(CSR1212_KV_KEY_ID(ki),
1133                                           CSR1212_KV_VAL(ki));
1134                 if (!k) {
1135                         ret = -ENOMEM;
1136                         goto out;
1137                 }
1138
1139                 k->refcnt = 0;  /* Don't keep local reference when parsing. */
1140                 break;
1141
1142         case CSR1212_KV_TYPE_CSR_OFFSET:
1143                 k = csr1212_new_csr_offset(CSR1212_KV_KEY_ID(ki),
1144                                            CSR1212_KV_VAL(ki));
1145                 if (!k) {
1146                         ret = -ENOMEM;
1147                         goto out;
1148                 }
1149                 k->refcnt = 0;  /* Don't keep local reference when parsing. */
1150                 break;
1151
1152         default:
1153                 /* Compute the offset from 0xffff f000 0000. */
1154                 offset = quads_to_bytes(CSR1212_KV_VAL(ki)) + kv_pos;
1155                 if (offset == kv_pos) {
1156                         /* Uh-oh.  Can't have a relative offset of 0 for Leaves
1157                          * or Directories.  The Config ROM image is most likely
1158                          * messed up, so we'll just abort here. */
1159                         ret = -EIO;
1160                         goto out;
1161                 }
1162
1163                 k = csr1212_find_keyval_offset(dir, offset);
1164
1165                 if (k)
1166                         break;          /* Found it. */
1167
1168                 if (CSR1212_KV_KEY_TYPE(ki) == CSR1212_KV_TYPE_DIRECTORY)
1169                         k = csr1212_new_directory(CSR1212_KV_KEY_ID(ki));
1170                 else
1171                         k = csr1212_new_leaf(CSR1212_KV_KEY_ID(ki), NULL, 0);
1172
1173                 if (!k) {
1174                         ret = -ENOMEM;
1175                         goto out;
1176                 }
1177                 k->refcnt = 0;  /* Don't keep local reference when parsing. */
1178                 k->valid = 0;   /* Contents not read yet so it's not valid. */
1179                 k->offset = offset;
1180
1181                 k->prev = dir;
1182                 k->next = dir->next;
1183                 dir->next->prev = k;
1184                 dir->next = k;
1185         }
1186         ret = csr1212_attach_keyval_to_directory(dir, k);
1187 out:
1188         if (ret != CSR1212_SUCCESS && k != NULL)
1189                 free_keyval(k);
1190         return ret;
1191 }
1192
1193 int csr1212_parse_keyval(struct csr1212_keyval *kv,
1194                          struct csr1212_csr_rom_cache *cache)
1195 {
1196         struct csr1212_keyval_img *kvi;
1197         int i;
1198         int ret = CSR1212_SUCCESS;
1199         int kvi_len;
1200
1201         kvi = (struct csr1212_keyval_img*)
1202                 &cache->data[bytes_to_quads(kv->offset - cache->offset)];
1203         kvi_len = be16_to_cpu(kvi->length);
1204
1205         /* Apparently there are many different wrong implementations of the CRC
1206          * algorithm.  We don't fail, we just warn. */
1207         if ((csr1212_crc16(kvi->data, kvi_len) != kvi->crc) &&
1208             (csr1212_msft_crc16(kvi->data, kvi_len) != kvi->crc))
1209                 printk(KERN_DEBUG "IEEE 1394 device has ROM CRC error\n");
1210
1211         switch (kv->key.type) {
1212         case CSR1212_KV_TYPE_DIRECTORY:
1213                 for (i = 0; i < kvi_len; i++) {
1214                         u32 ki = kvi->data[i];
1215
1216                         /* Some devices put null entries in their unit
1217                          * directories.  If we come across such an entry,
1218                          * then skip it. */
1219                         if (ki == 0x0)
1220                                 continue;
1221                         ret = csr1212_parse_dir_entry(kv, ki,
1222                                         kv->offset + quads_to_bytes(i + 1));
1223                 }
1224                 kv->value.directory.len = kvi_len;
1225                 break;
1226
1227         case CSR1212_KV_TYPE_LEAF:
1228                 if (kv->key.id != CSR1212_KV_ID_EXTENDED_ROM) {
1229                         size_t size = quads_to_bytes(kvi_len);
1230
1231                         kv->value.leaf.data = CSR1212_MALLOC(size);
1232                         if (!kv->value.leaf.data) {
1233                                 ret = -ENOMEM;
1234                                 goto out;
1235                         }
1236
1237                         kv->value.leaf.len = kvi_len;
1238                         memcpy(kv->value.leaf.data, kvi->data, size);
1239                 }
1240                 break;
1241         }
1242
1243         kv->valid = 1;
1244 out:
1245         return ret;
1246 }
1247
1248 static int
1249 csr1212_read_keyval(struct csr1212_csr *csr, struct csr1212_keyval *kv)
1250 {
1251         struct csr1212_cache_region *cr, *ncr, *newcr = NULL;
1252         struct csr1212_keyval_img *kvi = NULL;
1253         struct csr1212_csr_rom_cache *cache;
1254         int cache_index;
1255         u64 addr;
1256         u32 *cache_ptr;
1257         u16 kv_len = 0;
1258
1259         BUG_ON(!csr || !kv || csr->max_rom < 1);
1260
1261         /* First find which cache the data should be in (or go in if not read
1262          * yet). */
1263         for (cache = csr->cache_head; cache; cache = cache->next)
1264                 if (kv->offset >= cache->offset &&
1265                     kv->offset < (cache->offset + cache->size))
1266                         break;
1267
1268         if (!cache) {
1269                 u32 q, cache_size;
1270
1271                 /* Only create a new cache for Extended ROM leaves. */
1272                 if (kv->key.id != CSR1212_KV_ID_EXTENDED_ROM)
1273                         return -EINVAL;
1274
1275                 if (csr->ops->bus_read(csr,
1276                                        CSR1212_REGISTER_SPACE_BASE + kv->offset,
1277                                        sizeof(u32), &q, csr->private))
1278                         return -EIO;
1279
1280                 kv->value.leaf.len = be32_to_cpu(q) >> 16;
1281
1282                 cache_size = (quads_to_bytes(kv->value.leaf.len + 1) +
1283                               (csr->max_rom - 1)) & ~(csr->max_rom - 1);
1284
1285                 cache = csr1212_rom_cache_malloc(kv->offset, cache_size);
1286                 if (!cache)
1287                         return -ENOMEM;
1288
1289                 kv->value.leaf.data = &cache->data[1];
1290                 csr->cache_tail->next = cache;
1291                 cache->prev = csr->cache_tail;
1292                 cache->next = NULL;
1293                 csr->cache_tail = cache;
1294                 cache->filled_head =
1295                         CSR1212_MALLOC(sizeof(*cache->filled_head));
1296                 if (!cache->filled_head)
1297                         return -ENOMEM;
1298
1299                 cache->filled_head->offset_start = 0;
1300                 cache->filled_head->offset_end = sizeof(u32);
1301                 cache->filled_tail = cache->filled_head;
1302                 cache->filled_head->next = NULL;
1303                 cache->filled_head->prev = NULL;
1304                 cache->data[0] = q;
1305
1306                 /* Don't read the entire extended ROM now.  Pieces of it will
1307                  * be read when entries inside it are read. */
1308                 return csr1212_parse_keyval(kv, cache);
1309         }
1310
1311         cache_index = kv->offset - cache->offset;
1312
1313         /* Now seach read portions of the cache to see if it is there. */
1314         for (cr = cache->filled_head; cr; cr = cr->next) {
1315                 if (cache_index < cr->offset_start) {
1316                         newcr = CSR1212_MALLOC(sizeof(*newcr));
1317                         if (!newcr)
1318                                 return -ENOMEM;
1319
1320                         newcr->offset_start = cache_index & ~(csr->max_rom - 1);
1321                         newcr->offset_end = newcr->offset_start;
1322                         newcr->next = cr;
1323                         newcr->prev = cr->prev;
1324                         cr->prev = newcr;
1325                         cr = newcr;
1326                         break;
1327                 } else if ((cache_index >= cr->offset_start) &&
1328                            (cache_index < cr->offset_end)) {
1329                         kvi = (struct csr1212_keyval_img*)
1330                                 (&cache->data[bytes_to_quads(cache_index)]);
1331                         kv_len = quads_to_bytes(be16_to_cpu(kvi->length) + 1);
1332                         break;
1333                 } else if (cache_index == cr->offset_end) {
1334                         break;
1335                 }
1336         }
1337
1338         if (!cr) {
1339                 cr = cache->filled_tail;
1340                 newcr = CSR1212_MALLOC(sizeof(*newcr));
1341                 if (!newcr)
1342                         return -ENOMEM;
1343
1344                 newcr->offset_start = cache_index & ~(csr->max_rom - 1);
1345                 newcr->offset_end = newcr->offset_start;
1346                 newcr->prev = cr;
1347                 newcr->next = cr->next;
1348                 cr->next = newcr;
1349                 cr = newcr;
1350                 cache->filled_tail = newcr;
1351         }
1352
1353         while(!kvi || cr->offset_end < cache_index + kv_len) {
1354                 cache_ptr = &cache->data[bytes_to_quads(cr->offset_end &
1355                                                         ~(csr->max_rom - 1))];
1356
1357                 addr = (CSR1212_CSR_ARCH_REG_SPACE_BASE + cache->offset +
1358                         cr->offset_end) & ~(csr->max_rom - 1);
1359
1360                 if (csr->ops->bus_read(csr, addr, csr->max_rom, cache_ptr,
1361                                        csr->private)) {
1362                         if (csr->max_rom == 4)
1363                                 /* We've got problems! */
1364                                 return -EIO;
1365
1366                         /* Apperently the max_rom value was a lie, set it to
1367                          * do quadlet reads and try again. */
1368                         csr->max_rom = 4;
1369                         continue;
1370                 }
1371
1372                 cr->offset_end += csr->max_rom - (cr->offset_end &
1373                                                   (csr->max_rom - 1));
1374
1375                 if (!kvi && (cr->offset_end > cache_index)) {
1376                         kvi = (struct csr1212_keyval_img*)
1377                                 (&cache->data[bytes_to_quads(cache_index)]);
1378                         kv_len = quads_to_bytes(be16_to_cpu(kvi->length) + 1);
1379                 }
1380
1381                 if ((kv_len + (kv->offset - cache->offset)) > cache->size) {
1382                         /* The Leaf or Directory claims its length extends
1383                          * beyond the ConfigROM image region and thus beyond the
1384                          * end of our cache region.  Therefore, we abort now
1385                          * rather than seg faulting later. */
1386                         return -EIO;
1387                 }
1388
1389                 ncr = cr->next;
1390
1391                 if (ncr && (cr->offset_end >= ncr->offset_start)) {
1392                         /* consolidate region entries */
1393                         ncr->offset_start = cr->offset_start;
1394
1395                         if (cr->prev)
1396                                 cr->prev->next = cr->next;
1397                         ncr->prev = cr->prev;
1398                         if (cache->filled_head == cr)
1399                                 cache->filled_head = ncr;
1400                         CSR1212_FREE(cr);
1401                         cr = ncr;
1402                 }
1403         }
1404
1405         return csr1212_parse_keyval(kv, cache);
1406 }
1407
1408 struct csr1212_keyval *
1409 csr1212_get_keyval(struct csr1212_csr *csr, struct csr1212_keyval *kv)
1410 {
1411         if (!kv)
1412                 return NULL;
1413         if (!kv->valid)
1414                 if (csr1212_read_keyval(csr, kv) != CSR1212_SUCCESS)
1415                         return NULL;
1416         return kv;
1417 }
1418
1419 int csr1212_parse_csr(struct csr1212_csr *csr)
1420 {
1421         static const int mr_map[] = { 4, 64, 1024, 0 };
1422         struct csr1212_dentry *dentry;
1423         int ret;
1424
1425         BUG_ON(!csr || !csr->ops || !csr->ops->bus_read);
1426
1427         ret = csr1212_parse_bus_info_block(csr);
1428         if (ret != CSR1212_SUCCESS)
1429                 return ret;
1430
1431         if (!csr->ops->get_max_rom) {
1432                 csr->max_rom = mr_map[0];       /* default value */
1433         } else {
1434                 int i = csr->ops->get_max_rom(csr->bus_info_data,
1435                                               csr->private);
1436                 if (i & ~0x3)
1437                         return -EINVAL;
1438                 csr->max_rom = mr_map[i];
1439         }
1440
1441         csr->cache_head->layout_head = csr->root_kv;
1442         csr->cache_head->layout_tail = csr->root_kv;
1443
1444         csr->root_kv->offset = (CSR1212_CONFIG_ROM_SPACE_BASE & 0xffff) +
1445                 csr->bus_info_len;
1446
1447         csr->root_kv->valid = 0;
1448         csr->root_kv->next = csr->root_kv;
1449         csr->root_kv->prev = csr->root_kv;
1450         ret = csr1212_read_keyval(csr, csr->root_kv);
1451         if (ret != CSR1212_SUCCESS)
1452                 return ret;
1453
1454         /* Scan through the Root directory finding all extended ROM regions
1455          * and make cache regions for them */
1456         for (dentry = csr->root_kv->value.directory.dentries_head;
1457              dentry; dentry = dentry->next) {
1458                 if (dentry->kv->key.id == CSR1212_KV_ID_EXTENDED_ROM &&
1459                         !dentry->kv->valid) {
1460                         ret = csr1212_read_keyval(csr, dentry->kv);
1461                         if (ret != CSR1212_SUCCESS)
1462                                 return ret;
1463                 }
1464         }
1465
1466         return CSR1212_SUCCESS;
1467 }