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21#include <linux/bug.h>
22#include <linux/ctype.h>
23#include <linux/delay.h>
24#include <linux/device.h>
25#include <linux/errno.h>
26#include <linux/firewire.h>
27#include <linux/firewire-constants.h>
28#include <linux/idr.h>
29#include <linux/jiffies.h>
30#include <linux/kobject.h>
31#include <linux/list.h>
32#include <linux/mod_devicetable.h>
33#include <linux/module.h>
34#include <linux/mutex.h>
35#include <linux/random.h>
36#include <linux/rwsem.h>
37#include <linux/slab.h>
38#include <linux/spinlock.h>
39#include <linux/string.h>
40#include <linux/workqueue.h>
41
42#include <linux/atomic.h>
43#include <asm/byteorder.h>
44
45#include "core.h"
46
47void fw_csr_iterator_init(struct fw_csr_iterator *ci, const u32 *p)
48{
49 ci->p = p + 1;
50 ci->end = ci->p + (p[0] >> 16);
51}
52EXPORT_SYMBOL(fw_csr_iterator_init);
53
54int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value)
55{
56 *key = *ci->p >> 24;
57 *value = *ci->p & 0xffffff;
58
59 return ci->p++ < ci->end;
60}
61EXPORT_SYMBOL(fw_csr_iterator_next);
62
63static const u32 *search_leaf(const u32 *directory, int search_key)
64{
65 struct fw_csr_iterator ci;
66 int last_key = 0, key, value;
67
68 fw_csr_iterator_init(&ci, directory);
69 while (fw_csr_iterator_next(&ci, &key, &value)) {
70 if (last_key == search_key &&
71 key == (CSR_DESCRIPTOR | CSR_LEAF))
72 return ci.p - 1 + value;
73
74 last_key = key;
75 }
76
77 return NULL;
78}
79
80static int textual_leaf_to_string(const u32 *block, char *buf, size_t size)
81{
82 unsigned int quadlets, i;
83 char c;
84
85 if (!size || !buf)
86 return -EINVAL;
87
88 quadlets = min(block[0] >> 16, 256U);
89 if (quadlets < 2)
90 return -ENODATA;
91
92 if (block[1] != 0 || block[2] != 0)
93
94 return -ENODATA;
95
96 block += 3;
97 quadlets -= 2;
98 for (i = 0; i < quadlets * 4 && i < size - 1; i++) {
99 c = block[i / 4] >> (24 - 8 * (i % 4));
100 if (c == '\0')
101 break;
102 buf[i] = c;
103 }
104 buf[i] = '\0';
105
106 return i;
107}
108
109
110
111
112
113
114
115
116
117
118
119
120int fw_csr_string(const u32 *directory, int key, char *buf, size_t size)
121{
122 const u32 *leaf = search_leaf(directory, key);
123 if (!leaf)
124 return -ENOENT;
125
126 return textual_leaf_to_string(leaf, buf, size);
127}
128EXPORT_SYMBOL(fw_csr_string);
129
130static void get_ids(const u32 *directory, int *id)
131{
132 struct fw_csr_iterator ci;
133 int key, value;
134
135 fw_csr_iterator_init(&ci, directory);
136 while (fw_csr_iterator_next(&ci, &key, &value)) {
137 switch (key) {
138 case CSR_VENDOR: id[0] = value; break;
139 case CSR_MODEL: id[1] = value; break;
140 case CSR_SPECIFIER_ID: id[2] = value; break;
141 case CSR_VERSION: id[3] = value; break;
142 }
143 }
144}
145
146static void get_modalias_ids(struct fw_unit *unit, int *id)
147{
148 get_ids(&fw_parent_device(unit)->config_rom[5], id);
149 get_ids(unit->directory, id);
150}
151
152static bool match_ids(const struct ieee1394_device_id *id_table, int *id)
153{
154 int match = 0;
155
156 if (id[0] == id_table->vendor_id)
157 match |= IEEE1394_MATCH_VENDOR_ID;
158 if (id[1] == id_table->model_id)
159 match |= IEEE1394_MATCH_MODEL_ID;
160 if (id[2] == id_table->specifier_id)
161 match |= IEEE1394_MATCH_SPECIFIER_ID;
162 if (id[3] == id_table->version)
163 match |= IEEE1394_MATCH_VERSION;
164
165 return (match & id_table->match_flags) == id_table->match_flags;
166}
167
168static const struct ieee1394_device_id *unit_match(struct device *dev,
169 struct device_driver *drv)
170{
171 const struct ieee1394_device_id *id_table =
172 container_of(drv, struct fw_driver, driver)->id_table;
173 int id[] = {0, 0, 0, 0};
174
175 get_modalias_ids(fw_unit(dev), id);
176
177 for (; id_table->match_flags != 0; id_table++)
178 if (match_ids(id_table, id))
179 return id_table;
180
181 return NULL;
182}
183
184static bool is_fw_unit(struct device *dev);
185
186static int fw_unit_match(struct device *dev, struct device_driver *drv)
187{
188
189 return is_fw_unit(dev) && unit_match(dev, drv) != NULL;
190}
191
192static int fw_unit_probe(struct device *dev)
193{
194 struct fw_driver *driver =
195 container_of(dev->driver, struct fw_driver, driver);
196
197 return driver->probe(fw_unit(dev), unit_match(dev, dev->driver));
198}
199
200static int fw_unit_remove(struct device *dev)
201{
202 struct fw_driver *driver =
203 container_of(dev->driver, struct fw_driver, driver);
204
205 return driver->remove(fw_unit(dev)), 0;
206}
207
208static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size)
209{
210 int id[] = {0, 0, 0, 0};
211
212 get_modalias_ids(unit, id);
213
214 return snprintf(buffer, buffer_size,
215 "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
216 id[0], id[1], id[2], id[3]);
217}
218
219static int fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env)
220{
221 struct fw_unit *unit = fw_unit(dev);
222 char modalias[64];
223
224 get_modalias(unit, modalias, sizeof(modalias));
225
226 if (add_uevent_var(env, "MODALIAS=%s", modalias))
227 return -ENOMEM;
228
229 return 0;
230}
231
232struct bus_type fw_bus_type = {
233 .name = "firewire",
234 .match = fw_unit_match,
235 .probe = fw_unit_probe,
236 .remove = fw_unit_remove,
237};
238EXPORT_SYMBOL(fw_bus_type);
239
240int fw_device_enable_phys_dma(struct fw_device *device)
241{
242 int generation = device->generation;
243
244
245 smp_rmb();
246
247 return device->card->driver->enable_phys_dma(device->card,
248 device->node_id,
249 generation);
250}
251EXPORT_SYMBOL(fw_device_enable_phys_dma);
252
253struct config_rom_attribute {
254 struct device_attribute attr;
255 u32 key;
256};
257
258static ssize_t show_immediate(struct device *dev,
259 struct device_attribute *dattr, char *buf)
260{
261 struct config_rom_attribute *attr =
262 container_of(dattr, struct config_rom_attribute, attr);
263 struct fw_csr_iterator ci;
264 const u32 *dir;
265 int key, value, ret = -ENOENT;
266
267 down_read(&fw_device_rwsem);
268
269 if (is_fw_unit(dev))
270 dir = fw_unit(dev)->directory;
271 else
272 dir = fw_device(dev)->config_rom + 5;
273
274 fw_csr_iterator_init(&ci, dir);
275 while (fw_csr_iterator_next(&ci, &key, &value))
276 if (attr->key == key) {
277 ret = snprintf(buf, buf ? PAGE_SIZE : 0,
278 "0x%06x\n", value);
279 break;
280 }
281
282 up_read(&fw_device_rwsem);
283
284 return ret;
285}
286
287#define IMMEDIATE_ATTR(name, key) \
288 { __ATTR(name, S_IRUGO, show_immediate, NULL), key }
289
290static ssize_t show_text_leaf(struct device *dev,
291 struct device_attribute *dattr, char *buf)
292{
293 struct config_rom_attribute *attr =
294 container_of(dattr, struct config_rom_attribute, attr);
295 const u32 *dir;
296 size_t bufsize;
297 char dummy_buf[2];
298 int ret;
299
300 down_read(&fw_device_rwsem);
301
302 if (is_fw_unit(dev))
303 dir = fw_unit(dev)->directory;
304 else
305 dir = fw_device(dev)->config_rom + 5;
306
307 if (buf) {
308 bufsize = PAGE_SIZE - 1;
309 } else {
310 buf = dummy_buf;
311 bufsize = 1;
312 }
313
314 ret = fw_csr_string(dir, attr->key, buf, bufsize);
315
316 if (ret >= 0) {
317
318 while (ret > 0 && isspace(buf[ret - 1]))
319 ret--;
320 strcpy(buf + ret, "\n");
321 ret++;
322 }
323
324 up_read(&fw_device_rwsem);
325
326 return ret;
327}
328
329#define TEXT_LEAF_ATTR(name, key) \
330 { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key }
331
332static struct config_rom_attribute config_rom_attributes[] = {
333 IMMEDIATE_ATTR(vendor, CSR_VENDOR),
334 IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION),
335 IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID),
336 IMMEDIATE_ATTR(version, CSR_VERSION),
337 IMMEDIATE_ATTR(model, CSR_MODEL),
338 TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR),
339 TEXT_LEAF_ATTR(model_name, CSR_MODEL),
340 TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION),
341};
342
343static void init_fw_attribute_group(struct device *dev,
344 struct device_attribute *attrs,
345 struct fw_attribute_group *group)
346{
347 struct device_attribute *attr;
348 int i, j;
349
350 for (j = 0; attrs[j].attr.name != NULL; j++)
351 group->attrs[j] = &attrs[j].attr;
352
353 for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) {
354 attr = &config_rom_attributes[i].attr;
355 if (attr->show(dev, attr, NULL) < 0)
356 continue;
357 group->attrs[j++] = &attr->attr;
358 }
359
360 group->attrs[j] = NULL;
361 group->groups[0] = &group->group;
362 group->groups[1] = NULL;
363 group->group.attrs = group->attrs;
364 dev->groups = (const struct attribute_group **) group->groups;
365}
366
367static ssize_t modalias_show(struct device *dev,
368 struct device_attribute *attr, char *buf)
369{
370 struct fw_unit *unit = fw_unit(dev);
371 int length;
372
373 length = get_modalias(unit, buf, PAGE_SIZE);
374 strcpy(buf + length, "\n");
375
376 return length + 1;
377}
378
379static ssize_t rom_index_show(struct device *dev,
380 struct device_attribute *attr, char *buf)
381{
382 struct fw_device *device = fw_device(dev->parent);
383 struct fw_unit *unit = fw_unit(dev);
384
385 return snprintf(buf, PAGE_SIZE, "%d\n",
386 (int)(unit->directory - device->config_rom));
387}
388
389static struct device_attribute fw_unit_attributes[] = {
390 __ATTR_RO(modalias),
391 __ATTR_RO(rom_index),
392 __ATTR_NULL,
393};
394
395static ssize_t config_rom_show(struct device *dev,
396 struct device_attribute *attr, char *buf)
397{
398 struct fw_device *device = fw_device(dev);
399 size_t length;
400
401 down_read(&fw_device_rwsem);
402 length = device->config_rom_length * 4;
403 memcpy(buf, device->config_rom, length);
404 up_read(&fw_device_rwsem);
405
406 return length;
407}
408
409static ssize_t guid_show(struct device *dev,
410 struct device_attribute *attr, char *buf)
411{
412 struct fw_device *device = fw_device(dev);
413 int ret;
414
415 down_read(&fw_device_rwsem);
416 ret = snprintf(buf, PAGE_SIZE, "0x%08x%08x\n",
417 device->config_rom[3], device->config_rom[4]);
418 up_read(&fw_device_rwsem);
419
420 return ret;
421}
422
423static ssize_t is_local_show(struct device *dev,
424 struct device_attribute *attr, char *buf)
425{
426 struct fw_device *device = fw_device(dev);
427
428 return sprintf(buf, "%u\n", device->is_local);
429}
430
431static int units_sprintf(char *buf, const u32 *directory)
432{
433 struct fw_csr_iterator ci;
434 int key, value;
435 int specifier_id = 0;
436 int version = 0;
437
438 fw_csr_iterator_init(&ci, directory);
439 while (fw_csr_iterator_next(&ci, &key, &value)) {
440 switch (key) {
441 case CSR_SPECIFIER_ID:
442 specifier_id = value;
443 break;
444 case CSR_VERSION:
445 version = value;
446 break;
447 }
448 }
449
450 return sprintf(buf, "0x%06x:0x%06x ", specifier_id, version);
451}
452
453static ssize_t units_show(struct device *dev,
454 struct device_attribute *attr, char *buf)
455{
456 struct fw_device *device = fw_device(dev);
457 struct fw_csr_iterator ci;
458 int key, value, i = 0;
459
460 down_read(&fw_device_rwsem);
461 fw_csr_iterator_init(&ci, &device->config_rom[5]);
462 while (fw_csr_iterator_next(&ci, &key, &value)) {
463 if (key != (CSR_UNIT | CSR_DIRECTORY))
464 continue;
465 i += units_sprintf(&buf[i], ci.p + value - 1);
466 if (i >= PAGE_SIZE - (8 + 1 + 8 + 1))
467 break;
468 }
469 up_read(&fw_device_rwsem);
470
471 if (i)
472 buf[i - 1] = '\n';
473
474 return i;
475}
476
477static struct device_attribute fw_device_attributes[] = {
478 __ATTR_RO(config_rom),
479 __ATTR_RO(guid),
480 __ATTR_RO(is_local),
481 __ATTR_RO(units),
482 __ATTR_NULL,
483};
484
485static int read_rom(struct fw_device *device,
486 int generation, int index, u32 *data)
487{
488 u64 offset = (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4;
489 int i, rcode;
490
491
492 smp_rmb();
493
494 for (i = 10; i < 100; i += 10) {
495 rcode = fw_run_transaction(device->card,
496 TCODE_READ_QUADLET_REQUEST, device->node_id,
497 generation, device->max_speed, offset, data, 4);
498 if (rcode != RCODE_BUSY)
499 break;
500 msleep(i);
501 }
502 be32_to_cpus(data);
503
504 return rcode;
505}
506
507#define MAX_CONFIG_ROM_SIZE 256
508
509
510
511
512
513
514
515
516
517static int read_config_rom(struct fw_device *device, int generation)
518{
519 struct fw_card *card = device->card;
520 const u32 *old_rom, *new_rom;
521 u32 *rom, *stack;
522 u32 sp, key;
523 int i, end, length, ret;
524
525 rom = kmalloc(sizeof(*rom) * MAX_CONFIG_ROM_SIZE +
526 sizeof(*stack) * MAX_CONFIG_ROM_SIZE, GFP_KERNEL);
527 if (rom == NULL)
528 return -ENOMEM;
529
530 stack = &rom[MAX_CONFIG_ROM_SIZE];
531 memset(rom, 0, sizeof(*rom) * MAX_CONFIG_ROM_SIZE);
532
533 device->max_speed = SCODE_100;
534
535
536 for (i = 0; i < 5; i++) {
537 ret = read_rom(device, generation, i, &rom[i]);
538 if (ret != RCODE_COMPLETE)
539 goto out;
540
541
542
543
544
545
546
547
548 if (i == 0 && rom[i] == 0) {
549 ret = RCODE_BUSY;
550 goto out;
551 }
552 }
553
554 device->max_speed = device->node->max_speed;
555
556
557
558
559
560
561
562
563
564
565 if ((rom[2] & 0x7) < device->max_speed ||
566 device->max_speed == SCODE_BETA ||
567 card->beta_repeaters_present) {
568 u32 dummy;
569
570
571 if (device->max_speed == SCODE_BETA)
572 device->max_speed = card->link_speed;
573
574 while (device->max_speed > SCODE_100) {
575 if (read_rom(device, generation, 0, &dummy) ==
576 RCODE_COMPLETE)
577 break;
578 device->max_speed--;
579 }
580 }
581
582
583
584
585
586
587
588
589 length = i;
590 sp = 0;
591 stack[sp++] = 0xc0000005;
592 while (sp > 0) {
593
594
595
596
597
598
599 key = stack[--sp];
600 i = key & 0xffffff;
601 if (WARN_ON(i >= MAX_CONFIG_ROM_SIZE)) {
602 ret = -ENXIO;
603 goto out;
604 }
605
606
607 ret = read_rom(device, generation, i, &rom[i]);
608 if (ret != RCODE_COMPLETE)
609 goto out;
610 end = i + (rom[i] >> 16) + 1;
611 if (end > MAX_CONFIG_ROM_SIZE) {
612
613
614
615
616
617 fw_err(card, "skipped invalid ROM block %x at %llx\n",
618 rom[i],
619 i * 4 | CSR_REGISTER_BASE | CSR_CONFIG_ROM);
620 rom[i] = 0;
621 end = i;
622 }
623 i++;
624
625
626
627
628
629
630 for (; i < end; i++) {
631 ret = read_rom(device, generation, i, &rom[i]);
632 if (ret != RCODE_COMPLETE)
633 goto out;
634
635 if ((key >> 30) != 3 || (rom[i] >> 30) < 2)
636 continue;
637
638
639
640
641
642
643
644 if (i + (rom[i] & 0xffffff) >= MAX_CONFIG_ROM_SIZE) {
645 fw_err(card,
646 "skipped unsupported ROM entry %x at %llx\n",
647 rom[i],
648 i * 4 | CSR_REGISTER_BASE | CSR_CONFIG_ROM);
649 rom[i] = 0;
650 continue;
651 }
652 stack[sp++] = i + rom[i];
653 }
654 if (length < i)
655 length = i;
656 }
657
658 old_rom = device->config_rom;
659 new_rom = kmemdup(rom, length * 4, GFP_KERNEL);
660 if (new_rom == NULL) {
661 ret = -ENOMEM;
662 goto out;
663 }
664
665 down_write(&fw_device_rwsem);
666 device->config_rom = new_rom;
667 device->config_rom_length = length;
668 up_write(&fw_device_rwsem);
669
670 kfree(old_rom);
671 ret = RCODE_COMPLETE;
672 device->max_rec = rom[2] >> 12 & 0xf;
673 device->cmc = rom[2] >> 30 & 1;
674 device->irmc = rom[2] >> 31 & 1;
675 out:
676 kfree(rom);
677
678 return ret;
679}
680
681static void fw_unit_release(struct device *dev)
682{
683 struct fw_unit *unit = fw_unit(dev);
684
685 fw_device_put(fw_parent_device(unit));
686 kfree(unit);
687}
688
689static struct device_type fw_unit_type = {
690 .uevent = fw_unit_uevent,
691 .release = fw_unit_release,
692};
693
694static bool is_fw_unit(struct device *dev)
695{
696 return dev->type == &fw_unit_type;
697}
698
699static void create_units(struct fw_device *device)
700{
701 struct fw_csr_iterator ci;
702 struct fw_unit *unit;
703 int key, value, i;
704
705 i = 0;
706 fw_csr_iterator_init(&ci, &device->config_rom[5]);
707 while (fw_csr_iterator_next(&ci, &key, &value)) {
708 if (key != (CSR_UNIT | CSR_DIRECTORY))
709 continue;
710
711
712
713
714
715 unit = kzalloc(sizeof(*unit), GFP_KERNEL);
716 if (unit == NULL)
717 continue;
718
719 unit->directory = ci.p + value - 1;
720 unit->device.bus = &fw_bus_type;
721 unit->device.type = &fw_unit_type;
722 unit->device.parent = &device->device;
723 dev_set_name(&unit->device, "%s.%d", dev_name(&device->device), i++);
724
725 BUILD_BUG_ON(ARRAY_SIZE(unit->attribute_group.attrs) <
726 ARRAY_SIZE(fw_unit_attributes) +
727 ARRAY_SIZE(config_rom_attributes));
728 init_fw_attribute_group(&unit->device,
729 fw_unit_attributes,
730 &unit->attribute_group);
731
732 if (device_register(&unit->device) < 0)
733 goto skip_unit;
734
735 fw_device_get(device);
736 continue;
737
738 skip_unit:
739 kfree(unit);
740 }
741}
742
743static int shutdown_unit(struct device *device, void *data)
744{
745 device_unregister(device);
746
747 return 0;
748}
749
750
751
752
753
754
755
756DECLARE_RWSEM(fw_device_rwsem);
757
758DEFINE_IDR(fw_device_idr);
759int fw_cdev_major;
760
761struct fw_device *fw_device_get_by_devt(dev_t devt)
762{
763 struct fw_device *device;
764
765 down_read(&fw_device_rwsem);
766 device = idr_find(&fw_device_idr, MINOR(devt));
767 if (device)
768 fw_device_get(device);
769 up_read(&fw_device_rwsem);
770
771 return device;
772}
773
774struct workqueue_struct *fw_workqueue;
775EXPORT_SYMBOL(fw_workqueue);
776
777static void fw_schedule_device_work(struct fw_device *device,
778 unsigned long delay)
779{
780 queue_delayed_work(fw_workqueue, &device->work, delay);
781}
782
783
784
785
786
787
788
789
790
791
792
793
794#define MAX_RETRIES 10
795#define RETRY_DELAY (3 * HZ)
796#define INITIAL_DELAY (HZ / 2)
797#define SHUTDOWN_DELAY (2 * HZ)
798
799static void fw_device_shutdown(struct work_struct *work)
800{
801 struct fw_device *device =
802 container_of(work, struct fw_device, work.work);
803 int minor = MINOR(device->device.devt);
804
805 if (time_before64(get_jiffies_64(),
806 device->card->reset_jiffies + SHUTDOWN_DELAY)
807 && !list_empty(&device->card->link)) {
808 fw_schedule_device_work(device, SHUTDOWN_DELAY);
809 return;
810 }
811
812 if (atomic_cmpxchg(&device->state,
813 FW_DEVICE_GONE,
814 FW_DEVICE_SHUTDOWN) != FW_DEVICE_GONE)
815 return;
816
817 fw_device_cdev_remove(device);
818 device_for_each_child(&device->device, NULL, shutdown_unit);
819 device_unregister(&device->device);
820
821 down_write(&fw_device_rwsem);
822 idr_remove(&fw_device_idr, minor);
823 up_write(&fw_device_rwsem);
824
825 fw_device_put(device);
826}
827
828static void fw_device_release(struct device *dev)
829{
830 struct fw_device *device = fw_device(dev);
831 struct fw_card *card = device->card;
832 unsigned long flags;
833
834
835
836
837
838
839 spin_lock_irqsave(&card->lock, flags);
840 device->node->data = NULL;
841 spin_unlock_irqrestore(&card->lock, flags);
842
843 fw_node_put(device->node);
844 kfree(device->config_rom);
845 kfree(device);
846 fw_card_put(card);
847}
848
849static struct device_type fw_device_type = {
850 .release = fw_device_release,
851};
852
853static bool is_fw_device(struct device *dev)
854{
855 return dev->type == &fw_device_type;
856}
857
858static int update_unit(struct device *dev, void *data)
859{
860 struct fw_unit *unit = fw_unit(dev);
861 struct fw_driver *driver = (struct fw_driver *)dev->driver;
862
863 if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) {
864 device_lock(dev);
865 driver->update(unit);
866 device_unlock(dev);
867 }
868
869 return 0;
870}
871
872static void fw_device_update(struct work_struct *work)
873{
874 struct fw_device *device =
875 container_of(work, struct fw_device, work.work);
876
877 fw_device_cdev_update(device);
878 device_for_each_child(&device->device, NULL, update_unit);
879}
880
881
882
883
884
885
886
887static int lookup_existing_device(struct device *dev, void *data)
888{
889 struct fw_device *old = fw_device(dev);
890 struct fw_device *new = data;
891 struct fw_card *card = new->card;
892 int match = 0;
893
894 if (!is_fw_device(dev))
895 return 0;
896
897 down_read(&fw_device_rwsem);
898 spin_lock_irq(&card->lock);
899
900 if (memcmp(old->config_rom, new->config_rom, 6 * 4) == 0 &&
901 atomic_cmpxchg(&old->state,
902 FW_DEVICE_GONE,
903 FW_DEVICE_RUNNING) == FW_DEVICE_GONE) {
904 struct fw_node *current_node = new->node;
905 struct fw_node *obsolete_node = old->node;
906
907 new->node = obsolete_node;
908 new->node->data = new;
909 old->node = current_node;
910 old->node->data = old;
911
912 old->max_speed = new->max_speed;
913 old->node_id = current_node->node_id;
914 smp_wmb();
915 old->generation = card->generation;
916 old->config_rom_retries = 0;
917 fw_notice(card, "rediscovered device %s\n", dev_name(dev));
918
919 PREPARE_DELAYED_WORK(&old->work, fw_device_update);
920 fw_schedule_device_work(old, 0);
921
922 if (current_node == card->root_node)
923 fw_schedule_bm_work(card, 0);
924
925 match = 1;
926 }
927
928 spin_unlock_irq(&card->lock);
929 up_read(&fw_device_rwsem);
930
931 return match;
932}
933
934enum { BC_UNKNOWN = 0, BC_UNIMPLEMENTED, BC_IMPLEMENTED, };
935
936static void set_broadcast_channel(struct fw_device *device, int generation)
937{
938 struct fw_card *card = device->card;
939 __be32 data;
940 int rcode;
941
942 if (!card->broadcast_channel_allocated)
943 return;
944
945
946
947
948
949
950
951
952 if (!device->irmc || device->max_rec < 8)
953 return;
954
955
956
957
958
959 if (device->bc_implemented == BC_UNKNOWN) {
960 rcode = fw_run_transaction(card, TCODE_READ_QUADLET_REQUEST,
961 device->node_id, generation, device->max_speed,
962 CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL,
963 &data, 4);
964 switch (rcode) {
965 case RCODE_COMPLETE:
966 if (data & cpu_to_be32(1 << 31)) {
967 device->bc_implemented = BC_IMPLEMENTED;
968 break;
969 }
970
971 case RCODE_ADDRESS_ERROR:
972 device->bc_implemented = BC_UNIMPLEMENTED;
973 }
974 }
975
976 if (device->bc_implemented == BC_IMPLEMENTED) {
977 data = cpu_to_be32(BROADCAST_CHANNEL_INITIAL |
978 BROADCAST_CHANNEL_VALID);
979 fw_run_transaction(card, TCODE_WRITE_QUADLET_REQUEST,
980 device->node_id, generation, device->max_speed,
981 CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL,
982 &data, 4);
983 }
984}
985
986int fw_device_set_broadcast_channel(struct device *dev, void *gen)
987{
988 if (is_fw_device(dev))
989 set_broadcast_channel(fw_device(dev), (long)gen);
990
991 return 0;
992}
993
994static void fw_device_init(struct work_struct *work)
995{
996 struct fw_device *device =
997 container_of(work, struct fw_device, work.work);
998 struct fw_card *card = device->card;
999 struct device *revived_dev;
1000 int minor, ret;
1001
1002
1003
1004
1005
1006
1007
1008 ret = read_config_rom(device, device->generation);
1009 if (ret != RCODE_COMPLETE) {
1010 if (device->config_rom_retries < MAX_RETRIES &&
1011 atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
1012 device->config_rom_retries++;
1013 fw_schedule_device_work(device, RETRY_DELAY);
1014 } else {
1015 if (device->node->link_on)
1016 fw_notice(card, "giving up on node %x: reading config rom failed: %s\n",
1017 device->node_id,
1018 fw_rcode_string(ret));
1019 if (device->node == card->root_node)
1020 fw_schedule_bm_work(card, 0);
1021 fw_device_release(&device->device);
1022 }
1023 return;
1024 }
1025
1026 revived_dev = device_find_child(card->device,
1027 device, lookup_existing_device);
1028 if (revived_dev) {
1029 put_device(revived_dev);
1030 fw_device_release(&device->device);
1031
1032 return;
1033 }
1034
1035 device_initialize(&device->device);
1036
1037 fw_device_get(device);
1038 down_write(&fw_device_rwsem);
1039 minor = idr_alloc(&fw_device_idr, device, 0, 1 << MINORBITS,
1040 GFP_KERNEL);
1041 up_write(&fw_device_rwsem);
1042
1043 if (minor < 0)
1044 goto error;
1045
1046 device->device.bus = &fw_bus_type;
1047 device->device.type = &fw_device_type;
1048 device->device.parent = card->device;
1049 device->device.devt = MKDEV(fw_cdev_major, minor);
1050 dev_set_name(&device->device, "fw%d", minor);
1051
1052 BUILD_BUG_ON(ARRAY_SIZE(device->attribute_group.attrs) <
1053 ARRAY_SIZE(fw_device_attributes) +
1054 ARRAY_SIZE(config_rom_attributes));
1055 init_fw_attribute_group(&device->device,
1056 fw_device_attributes,
1057 &device->attribute_group);
1058
1059 if (device_add(&device->device)) {
1060 fw_err(card, "failed to add device\n");
1061 goto error_with_cdev;
1062 }
1063
1064 create_units(device);
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075 if (atomic_cmpxchg(&device->state,
1076 FW_DEVICE_INITIALIZING,
1077 FW_DEVICE_RUNNING) == FW_DEVICE_GONE) {
1078 PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown);
1079 fw_schedule_device_work(device, SHUTDOWN_DELAY);
1080 } else {
1081 fw_notice(card, "created device %s: GUID %08x%08x, S%d00\n",
1082 dev_name(&device->device),
1083 device->config_rom[3], device->config_rom[4],
1084 1 << device->max_speed);
1085 device->config_rom_retries = 0;
1086
1087 set_broadcast_channel(device, device->generation);
1088
1089 add_device_randomness(&device->config_rom[3], 8);
1090 }
1091
1092
1093
1094
1095
1096
1097
1098 if (device->node == card->root_node)
1099 fw_schedule_bm_work(card, 0);
1100
1101 return;
1102
1103 error_with_cdev:
1104 down_write(&fw_device_rwsem);
1105 idr_remove(&fw_device_idr, minor);
1106 up_write(&fw_device_rwsem);
1107 error:
1108 fw_device_put(device);
1109
1110 put_device(&device->device);
1111}
1112
1113
1114static int reread_config_rom(struct fw_device *device, int generation,
1115 bool *changed)
1116{
1117 u32 q;
1118 int i, rcode;
1119
1120 for (i = 0; i < 6; i++) {
1121 rcode = read_rom(device, generation, i, &q);
1122 if (rcode != RCODE_COMPLETE)
1123 return rcode;
1124
1125 if (i == 0 && q == 0)
1126
1127 return RCODE_BUSY;
1128
1129 if (q != device->config_rom[i]) {
1130 *changed = true;
1131 return RCODE_COMPLETE;
1132 }
1133 }
1134
1135 *changed = false;
1136 return RCODE_COMPLETE;
1137}
1138
1139static void fw_device_refresh(struct work_struct *work)
1140{
1141 struct fw_device *device =
1142 container_of(work, struct fw_device, work.work);
1143 struct fw_card *card = device->card;
1144 int ret, node_id = device->node_id;
1145 bool changed;
1146
1147 ret = reread_config_rom(device, device->generation, &changed);
1148 if (ret != RCODE_COMPLETE)
1149 goto failed_config_rom;
1150
1151 if (!changed) {
1152 if (atomic_cmpxchg(&device->state,
1153 FW_DEVICE_INITIALIZING,
1154 FW_DEVICE_RUNNING) == FW_DEVICE_GONE)
1155 goto gone;
1156
1157 fw_device_update(work);
1158 device->config_rom_retries = 0;
1159 goto out;
1160 }
1161
1162
1163
1164
1165
1166 device_for_each_child(&device->device, NULL, shutdown_unit);
1167
1168 ret = read_config_rom(device, device->generation);
1169 if (ret != RCODE_COMPLETE)
1170 goto failed_config_rom;
1171
1172 fw_device_cdev_update(device);
1173 create_units(device);
1174
1175
1176 kobject_uevent(&device->device.kobj, KOBJ_CHANGE);
1177
1178 if (atomic_cmpxchg(&device->state,
1179 FW_DEVICE_INITIALIZING,
1180 FW_DEVICE_RUNNING) == FW_DEVICE_GONE)
1181 goto gone;
1182
1183 fw_notice(card, "refreshed device %s\n", dev_name(&device->device));
1184 device->config_rom_retries = 0;
1185 goto out;
1186
1187 failed_config_rom:
1188 if (device->config_rom_retries < MAX_RETRIES &&
1189 atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
1190 device->config_rom_retries++;
1191 fw_schedule_device_work(device, RETRY_DELAY);
1192 return;
1193 }
1194
1195 fw_notice(card, "giving up on refresh of device %s: %s\n",
1196 dev_name(&device->device), fw_rcode_string(ret));
1197 gone:
1198 atomic_set(&device->state, FW_DEVICE_GONE);
1199 PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown);
1200 fw_schedule_device_work(device, SHUTDOWN_DELAY);
1201 out:
1202 if (node_id == card->root_node->node_id)
1203 fw_schedule_bm_work(card, 0);
1204}
1205
1206void fw_node_event(struct fw_card *card, struct fw_node *node, int event)
1207{
1208 struct fw_device *device;
1209
1210 switch (event) {
1211 case FW_NODE_CREATED:
1212
1213
1214
1215
1216
1217
1218 create:
1219 device = kzalloc(sizeof(*device), GFP_ATOMIC);
1220 if (device == NULL)
1221 break;
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233 atomic_set(&device->state, FW_DEVICE_INITIALIZING);
1234 device->card = fw_card_get(card);
1235 device->node = fw_node_get(node);
1236 device->node_id = node->node_id;
1237 device->generation = card->generation;
1238 device->is_local = node == card->local_node;
1239 mutex_init(&device->client_list_mutex);
1240 INIT_LIST_HEAD(&device->client_list);
1241
1242
1243
1244
1245
1246
1247 node->data = device;
1248
1249
1250
1251
1252
1253
1254
1255 INIT_DELAYED_WORK(&device->work, fw_device_init);
1256 fw_schedule_device_work(device, INITIAL_DELAY);
1257 break;
1258
1259 case FW_NODE_INITIATED_RESET:
1260 case FW_NODE_LINK_ON:
1261 device = node->data;
1262 if (device == NULL)
1263 goto create;
1264
1265 device->node_id = node->node_id;
1266 smp_wmb();
1267 device->generation = card->generation;
1268 if (atomic_cmpxchg(&device->state,
1269 FW_DEVICE_RUNNING,
1270 FW_DEVICE_INITIALIZING) == FW_DEVICE_RUNNING) {
1271 PREPARE_DELAYED_WORK(&device->work, fw_device_refresh);
1272 fw_schedule_device_work(device,
1273 device->is_local ? 0 : INITIAL_DELAY);
1274 }
1275 break;
1276
1277 case FW_NODE_UPDATED:
1278 device = node->data;
1279 if (device == NULL)
1280 break;
1281
1282 device->node_id = node->node_id;
1283 smp_wmb();
1284 device->generation = card->generation;
1285 if (atomic_read(&device->state) == FW_DEVICE_RUNNING) {
1286 PREPARE_DELAYED_WORK(&device->work, fw_device_update);
1287 fw_schedule_device_work(device, 0);
1288 }
1289 break;
1290
1291 case FW_NODE_DESTROYED:
1292 case FW_NODE_LINK_OFF:
1293 if (!node->data)
1294 break;
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308 device = node->data;
1309 if (atomic_xchg(&device->state,
1310 FW_DEVICE_GONE) == FW_DEVICE_RUNNING) {
1311 PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown);
1312 fw_schedule_device_work(device,
1313 list_empty(&card->link) ? 0 : SHUTDOWN_DELAY);
1314 }
1315 break;
1316 }
1317}
1318