ide-tape: unwrap idetape_queue_pc_tail()
[linux-2.6-block.git] / 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 /* Parse a chunk of data as a Config ROM */
1054
1055 static int csr1212_parse_bus_info_block(struct csr1212_csr *csr)
1056 {
1057         struct csr1212_bus_info_block_img *bi;
1058         struct csr1212_cache_region *cr;
1059         int i;
1060         int ret;
1061
1062         /* IEEE 1212 says that the entire bus info block should be readable in
1063          * a single transaction regardless of the max_rom value.
1064          * Unfortunately, many IEEE 1394 devices do not abide by that, so the
1065          * bus info block will be read 1 quadlet at a time.  The rest of the
1066          * ConfigROM will be read according to the max_rom field. */
1067         for (i = 0; i < csr->bus_info_len; i += sizeof(u32)) {
1068                 ret = csr->ops->bus_read(csr, CSR1212_CONFIG_ROM_SPACE_BASE + i,
1069                         sizeof(u32), &csr->cache_head->data[bytes_to_quads(i)],
1070                         csr->private);
1071                 if (ret != CSR1212_SUCCESS)
1072                         return ret;
1073
1074                 /* check ROM header's info_length */
1075                 if (i == 0 &&
1076                     be32_to_cpu(csr->cache_head->data[0]) >> 24 !=
1077                     bytes_to_quads(csr->bus_info_len) - 1)
1078                         return -EINVAL;
1079         }
1080
1081         bi = (struct csr1212_bus_info_block_img*)csr->cache_head->data;
1082         csr->crc_len = quads_to_bytes(bi->crc_length);
1083
1084         /* IEEE 1212 recommends that crc_len be equal to bus_info_len, but that
1085          * is not always the case, so read the rest of the crc area 1 quadlet at
1086          * a time. */
1087         for (i = csr->bus_info_len; i <= csr->crc_len; i += sizeof(u32)) {
1088                 ret = csr->ops->bus_read(csr, CSR1212_CONFIG_ROM_SPACE_BASE + i,
1089                         sizeof(u32), &csr->cache_head->data[bytes_to_quads(i)],
1090                         csr->private);
1091                 if (ret != CSR1212_SUCCESS)
1092                         return ret;
1093         }
1094
1095         /* Apparently there are many different wrong implementations of the CRC
1096          * algorithm.  We don't fail, we just warn. */
1097         if ((csr1212_crc16(bi->data, bi->crc_length) != bi->crc) &&
1098             (csr1212_msft_crc16(bi->data, bi->crc_length) != bi->crc))
1099                 printk(KERN_DEBUG "IEEE 1394 device has ROM CRC error\n");
1100
1101         cr = CSR1212_MALLOC(sizeof(*cr));
1102         if (!cr)
1103                 return -ENOMEM;
1104
1105         cr->next = NULL;
1106         cr->prev = NULL;
1107         cr->offset_start = 0;
1108         cr->offset_end = csr->crc_len + 4;
1109
1110         csr->cache_head->filled_head = cr;
1111         csr->cache_head->filled_tail = cr;
1112
1113         return CSR1212_SUCCESS;
1114 }
1115
1116 #define CSR1212_KV_KEY(q)       (be32_to_cpu(q) >> CSR1212_KV_KEY_SHIFT)
1117 #define CSR1212_KV_KEY_TYPE(q)  (CSR1212_KV_KEY(q) >> CSR1212_KV_KEY_TYPE_SHIFT)
1118 #define CSR1212_KV_KEY_ID(q)    (CSR1212_KV_KEY(q) & CSR1212_KV_KEY_ID_MASK)
1119 #define CSR1212_KV_VAL_MASK     0xffffff
1120 #define CSR1212_KV_VAL(q)       (be32_to_cpu(q) & CSR1212_KV_VAL_MASK)
1121
1122 static int
1123 csr1212_parse_dir_entry(struct csr1212_keyval *dir, u32 ki, u32 kv_pos)
1124 {
1125         int ret = CSR1212_SUCCESS;
1126         struct csr1212_keyval *k = NULL;
1127         u32 offset;
1128         bool keep_keyval = true;
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                 /* Don't keep local reference when parsing. */
1139                 keep_keyval = false;
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                 /* Don't keep local reference when parsing. */
1150                 keep_keyval = false;
1151                 break;
1152
1153         default:
1154                 /* Compute the offset from 0xffff f000 0000. */
1155                 offset = quads_to_bytes(CSR1212_KV_VAL(ki)) + kv_pos;
1156                 if (offset == kv_pos) {
1157                         /* Uh-oh.  Can't have a relative offset of 0 for Leaves
1158                          * or Directories.  The Config ROM image is most likely
1159                          * messed up, so we'll just abort here. */
1160                         ret = -EIO;
1161                         goto out;
1162                 }
1163
1164                 k = csr1212_find_keyval_offset(dir, offset);
1165
1166                 if (k)
1167                         break;          /* Found it. */
1168
1169                 if (CSR1212_KV_KEY_TYPE(ki) == CSR1212_KV_TYPE_DIRECTORY)
1170                         k = csr1212_new_directory(CSR1212_KV_KEY_ID(ki));
1171                 else
1172                         k = csr1212_new_leaf(CSR1212_KV_KEY_ID(ki), NULL, 0);
1173
1174                 if (!k) {
1175                         ret = -ENOMEM;
1176                         goto out;
1177                 }
1178                 /* Don't keep local reference when parsing. */
1179                 keep_keyval = false;
1180                 /* Contents not read yet so it's not valid. */
1181                 k->valid = 0;
1182                 k->offset = offset;
1183
1184                 k->prev = dir;
1185                 k->next = dir->next;
1186                 dir->next->prev = k;
1187                 dir->next = k;
1188         }
1189         ret = __csr1212_attach_keyval_to_directory(dir, k, keep_keyval);
1190 out:
1191         if (ret != CSR1212_SUCCESS && k != NULL)
1192                 free_keyval(k);
1193         return ret;
1194 }
1195
1196 int csr1212_parse_keyval(struct csr1212_keyval *kv,
1197                          struct csr1212_csr_rom_cache *cache)
1198 {
1199         struct csr1212_keyval_img *kvi;
1200         int i;
1201         int ret = CSR1212_SUCCESS;
1202         int kvi_len;
1203
1204         kvi = (struct csr1212_keyval_img*)
1205                 &cache->data[bytes_to_quads(kv->offset - cache->offset)];
1206         kvi_len = be16_to_cpu(kvi->length);
1207
1208         /* Apparently there are many different wrong implementations of the CRC
1209          * algorithm.  We don't fail, we just warn. */
1210         if ((csr1212_crc16(kvi->data, kvi_len) != kvi->crc) &&
1211             (csr1212_msft_crc16(kvi->data, kvi_len) != kvi->crc))
1212                 printk(KERN_DEBUG "IEEE 1394 device has ROM CRC error\n");
1213
1214         switch (kv->key.type) {
1215         case CSR1212_KV_TYPE_DIRECTORY:
1216                 for (i = 0; i < kvi_len; i++) {
1217                         u32 ki = kvi->data[i];
1218
1219                         /* Some devices put null entries in their unit
1220                          * directories.  If we come across such an entry,
1221                          * then skip it. */
1222                         if (ki == 0x0)
1223                                 continue;
1224                         ret = csr1212_parse_dir_entry(kv, ki,
1225                                         kv->offset + quads_to_bytes(i + 1));
1226                 }
1227                 kv->value.directory.len = kvi_len;
1228                 break;
1229
1230         case CSR1212_KV_TYPE_LEAF:
1231                 if (kv->key.id != CSR1212_KV_ID_EXTENDED_ROM) {
1232                         size_t size = quads_to_bytes(kvi_len);
1233
1234                         kv->value.leaf.data = CSR1212_MALLOC(size);
1235                         if (!kv->value.leaf.data) {
1236                                 ret = -ENOMEM;
1237                                 goto out;
1238                         }
1239
1240                         kv->value.leaf.len = kvi_len;
1241                         memcpy(kv->value.leaf.data, kvi->data, size);
1242                 }
1243                 break;
1244         }
1245
1246         kv->valid = 1;
1247 out:
1248         return ret;
1249 }
1250
1251 static int
1252 csr1212_read_keyval(struct csr1212_csr *csr, struct csr1212_keyval *kv)
1253 {
1254         struct csr1212_cache_region *cr, *ncr, *newcr = NULL;
1255         struct csr1212_keyval_img *kvi = NULL;
1256         struct csr1212_csr_rom_cache *cache;
1257         int cache_index;
1258         u64 addr;
1259         u32 *cache_ptr;
1260         u16 kv_len = 0;
1261
1262         BUG_ON(!csr || !kv || csr->max_rom < 1);
1263
1264         /* First find which cache the data should be in (or go in if not read
1265          * yet). */
1266         for (cache = csr->cache_head; cache; cache = cache->next)
1267                 if (kv->offset >= cache->offset &&
1268                     kv->offset < (cache->offset + cache->size))
1269                         break;
1270
1271         if (!cache) {
1272                 u32 q, cache_size;
1273
1274                 /* Only create a new cache for Extended ROM leaves. */
1275                 if (kv->key.id != CSR1212_KV_ID_EXTENDED_ROM)
1276                         return -EINVAL;
1277
1278                 if (csr->ops->bus_read(csr,
1279                                        CSR1212_REGISTER_SPACE_BASE + kv->offset,
1280                                        sizeof(u32), &q, csr->private))
1281                         return -EIO;
1282
1283                 kv->value.leaf.len = be32_to_cpu(q) >> 16;
1284
1285                 cache_size = (quads_to_bytes(kv->value.leaf.len + 1) +
1286                               (csr->max_rom - 1)) & ~(csr->max_rom - 1);
1287
1288                 cache = csr1212_rom_cache_malloc(kv->offset, cache_size);
1289                 if (!cache)
1290                         return -ENOMEM;
1291
1292                 kv->value.leaf.data = &cache->data[1];
1293                 csr->cache_tail->next = cache;
1294                 cache->prev = csr->cache_tail;
1295                 cache->next = NULL;
1296                 csr->cache_tail = cache;
1297                 cache->filled_head =
1298                         CSR1212_MALLOC(sizeof(*cache->filled_head));
1299                 if (!cache->filled_head)
1300                         return -ENOMEM;
1301
1302                 cache->filled_head->offset_start = 0;
1303                 cache->filled_head->offset_end = sizeof(u32);
1304                 cache->filled_tail = cache->filled_head;
1305                 cache->filled_head->next = NULL;
1306                 cache->filled_head->prev = NULL;
1307                 cache->data[0] = q;
1308
1309                 /* Don't read the entire extended ROM now.  Pieces of it will
1310                  * be read when entries inside it are read. */
1311                 return csr1212_parse_keyval(kv, cache);
1312         }
1313
1314         cache_index = kv->offset - cache->offset;
1315
1316         /* Now seach read portions of the cache to see if it is there. */
1317         for (cr = cache->filled_head; cr; cr = cr->next) {
1318                 if (cache_index < cr->offset_start) {
1319                         newcr = CSR1212_MALLOC(sizeof(*newcr));
1320                         if (!newcr)
1321                                 return -ENOMEM;
1322
1323                         newcr->offset_start = cache_index & ~(csr->max_rom - 1);
1324                         newcr->offset_end = newcr->offset_start;
1325                         newcr->next = cr;
1326                         newcr->prev = cr->prev;
1327                         cr->prev = newcr;
1328                         cr = newcr;
1329                         break;
1330                 } else if ((cache_index >= cr->offset_start) &&
1331                            (cache_index < cr->offset_end)) {
1332                         kvi = (struct csr1212_keyval_img*)
1333                                 (&cache->data[bytes_to_quads(cache_index)]);
1334                         kv_len = quads_to_bytes(be16_to_cpu(kvi->length) + 1);
1335                         break;
1336                 } else if (cache_index == cr->offset_end) {
1337                         break;
1338                 }
1339         }
1340
1341         if (!cr) {
1342                 cr = cache->filled_tail;
1343                 newcr = CSR1212_MALLOC(sizeof(*newcr));
1344                 if (!newcr)
1345                         return -ENOMEM;
1346
1347                 newcr->offset_start = cache_index & ~(csr->max_rom - 1);
1348                 newcr->offset_end = newcr->offset_start;
1349                 newcr->prev = cr;
1350                 newcr->next = cr->next;
1351                 cr->next = newcr;
1352                 cr = newcr;
1353                 cache->filled_tail = newcr;
1354         }
1355
1356         while(!kvi || cr->offset_end < cache_index + kv_len) {
1357                 cache_ptr = &cache->data[bytes_to_quads(cr->offset_end &
1358                                                         ~(csr->max_rom - 1))];
1359
1360                 addr = (CSR1212_CSR_ARCH_REG_SPACE_BASE + cache->offset +
1361                         cr->offset_end) & ~(csr->max_rom - 1);
1362
1363                 if (csr->ops->bus_read(csr, addr, csr->max_rom, cache_ptr,
1364                                        csr->private)) {
1365                         if (csr->max_rom == 4)
1366                                 /* We've got problems! */
1367                                 return -EIO;
1368
1369                         /* Apperently the max_rom value was a lie, set it to
1370                          * do quadlet reads and try again. */
1371                         csr->max_rom = 4;
1372                         continue;
1373                 }
1374
1375                 cr->offset_end += csr->max_rom - (cr->offset_end &
1376                                                   (csr->max_rom - 1));
1377
1378                 if (!kvi && (cr->offset_end > cache_index)) {
1379                         kvi = (struct csr1212_keyval_img*)
1380                                 (&cache->data[bytes_to_quads(cache_index)]);
1381                         kv_len = quads_to_bytes(be16_to_cpu(kvi->length) + 1);
1382                 }
1383
1384                 if ((kv_len + (kv->offset - cache->offset)) > cache->size) {
1385                         /* The Leaf or Directory claims its length extends
1386                          * beyond the ConfigROM image region and thus beyond the
1387                          * end of our cache region.  Therefore, we abort now
1388                          * rather than seg faulting later. */
1389                         return -EIO;
1390                 }
1391
1392                 ncr = cr->next;
1393
1394                 if (ncr && (cr->offset_end >= ncr->offset_start)) {
1395                         /* consolidate region entries */
1396                         ncr->offset_start = cr->offset_start;
1397
1398                         if (cr->prev)
1399                                 cr->prev->next = cr->next;
1400                         ncr->prev = cr->prev;
1401                         if (cache->filled_head == cr)
1402                                 cache->filled_head = ncr;
1403                         CSR1212_FREE(cr);
1404                         cr = ncr;
1405                 }
1406         }
1407
1408         return csr1212_parse_keyval(kv, cache);
1409 }
1410
1411 struct csr1212_keyval *
1412 csr1212_get_keyval(struct csr1212_csr *csr, struct csr1212_keyval *kv)
1413 {
1414         if (!kv)
1415                 return NULL;
1416         if (!kv->valid)
1417                 if (csr1212_read_keyval(csr, kv) != CSR1212_SUCCESS)
1418                         return NULL;
1419         return kv;
1420 }
1421
1422 int csr1212_parse_csr(struct csr1212_csr *csr)
1423 {
1424         static const int mr_map[] = { 4, 64, 1024, 0 };
1425         struct csr1212_dentry *dentry;
1426         int ret;
1427
1428         BUG_ON(!csr || !csr->ops || !csr->ops->bus_read);
1429
1430         ret = csr1212_parse_bus_info_block(csr);
1431         if (ret != CSR1212_SUCCESS)
1432                 return ret;
1433
1434         if (!csr->ops->get_max_rom) {
1435                 csr->max_rom = mr_map[0];       /* default value */
1436         } else {
1437                 int i = csr->ops->get_max_rom(csr->bus_info_data,
1438                                               csr->private);
1439                 if (i & ~0x3)
1440                         return -EINVAL;
1441                 csr->max_rom = mr_map[i];
1442         }
1443
1444         csr->cache_head->layout_head = csr->root_kv;
1445         csr->cache_head->layout_tail = csr->root_kv;
1446
1447         csr->root_kv->offset = (CSR1212_CONFIG_ROM_SPACE_BASE & 0xffff) +
1448                 csr->bus_info_len;
1449
1450         csr->root_kv->valid = 0;
1451         csr->root_kv->next = csr->root_kv;
1452         csr->root_kv->prev = csr->root_kv;
1453         ret = csr1212_read_keyval(csr, csr->root_kv);
1454         if (ret != CSR1212_SUCCESS)
1455                 return ret;
1456
1457         /* Scan through the Root directory finding all extended ROM regions
1458          * and make cache regions for them */
1459         for (dentry = csr->root_kv->value.directory.dentries_head;
1460              dentry; dentry = dentry->next) {
1461                 if (dentry->kv->key.id == CSR1212_KV_ID_EXTENDED_ROM &&
1462                         !dentry->kv->valid) {
1463                         ret = csr1212_read_keyval(csr, dentry->kv);
1464                         if (ret != CSR1212_SUCCESS)
1465                                 return ret;
1466                 }
1467         }
1468
1469         return CSR1212_SUCCESS;
1470 }