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21#include <linux/ctype.h>
22#include <linux/delay.h>
23#include <linux/device.h>
24#include <linux/errno.h>
25#include <linux/firewire.h>
26#include <linux/firewire-constants.h>
27#include <linux/idr.h>
28#include <linux/jiffies.h>
29#include <linux/kobject.h>
30#include <linux/list.h>
31#include <linux/mod_devicetable.h>
32#include <linux/module.h>
33#include <linux/mutex.h>
34#include <linux/rwsem.h>
35#include <linux/semaphore.h>
36#include <linux/spinlock.h>
37#include <linux/string.h>
38#include <linux/workqueue.h>
39
40#include <asm/atomic.h>
41#include <asm/byteorder.h>
42#include <asm/system.h>
43
44#include "core.h"
45
46void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 * p)
47{
48 ci->p = p + 1;
49 ci->end = ci->p + (p[0] >> 16);
50}
51EXPORT_SYMBOL(fw_csr_iterator_init);
52
53int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value)
54{
55 *key = *ci->p >> 24;
56 *value = *ci->p & 0xffffff;
57
58 return ci->p++ < ci->end;
59}
60EXPORT_SYMBOL(fw_csr_iterator_next);
61
62static bool is_fw_unit(struct device *dev);
63
64static int match_unit_directory(u32 *directory, u32 match_flags,
65 const struct ieee1394_device_id *id)
66{
67 struct fw_csr_iterator ci;
68 int key, value, match;
69
70 match = 0;
71 fw_csr_iterator_init(&ci, directory);
72 while (fw_csr_iterator_next(&ci, &key, &value)) {
73 if (key == CSR_VENDOR && value == id->vendor_id)
74 match |= IEEE1394_MATCH_VENDOR_ID;
75 if (key == CSR_MODEL && value == id->model_id)
76 match |= IEEE1394_MATCH_MODEL_ID;
77 if (key == CSR_SPECIFIER_ID && value == id->specifier_id)
78 match |= IEEE1394_MATCH_SPECIFIER_ID;
79 if (key == CSR_VERSION && value == id->version)
80 match |= IEEE1394_MATCH_VERSION;
81 }
82
83 return (match & match_flags) == match_flags;
84}
85
86static int fw_unit_match(struct device *dev, struct device_driver *drv)
87{
88 struct fw_unit *unit = fw_unit(dev);
89 struct fw_device *device;
90 const struct ieee1394_device_id *id;
91
92
93 if (!is_fw_unit(dev))
94 return 0;
95
96 device = fw_parent_device(unit);
97 id = container_of(drv, struct fw_driver, driver)->id_table;
98
99 for (; id->match_flags != 0; id++) {
100 if (match_unit_directory(unit->directory, id->match_flags, id))
101 return 1;
102
103
104 if ((id->match_flags & IEEE1394_MATCH_VENDOR_ID) &&
105 match_unit_directory(&device->config_rom[5],
106 IEEE1394_MATCH_VENDOR_ID, id) &&
107 match_unit_directory(unit->directory, id->match_flags
108 & ~IEEE1394_MATCH_VENDOR_ID, id))
109 return 1;
110 }
111
112 return 0;
113}
114
115static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size)
116{
117 struct fw_device *device = fw_parent_device(unit);
118 struct fw_csr_iterator ci;
119
120 int key, value;
121 int vendor = 0;
122 int model = 0;
123 int specifier_id = 0;
124 int version = 0;
125
126 fw_csr_iterator_init(&ci, &device->config_rom[5]);
127 while (fw_csr_iterator_next(&ci, &key, &value)) {
128 switch (key) {
129 case CSR_VENDOR:
130 vendor = value;
131 break;
132 case CSR_MODEL:
133 model = value;
134 break;
135 }
136 }
137
138 fw_csr_iterator_init(&ci, unit->directory);
139 while (fw_csr_iterator_next(&ci, &key, &value)) {
140 switch (key) {
141 case CSR_SPECIFIER_ID:
142 specifier_id = value;
143 break;
144 case CSR_VERSION:
145 version = value;
146 break;
147 }
148 }
149
150 return snprintf(buffer, buffer_size,
151 "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
152 vendor, model, specifier_id, version);
153}
154
155static int fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env)
156{
157 struct fw_unit *unit = fw_unit(dev);
158 char modalias[64];
159
160 get_modalias(unit, modalias, sizeof(modalias));
161
162 if (add_uevent_var(env, "MODALIAS=%s", modalias))
163 return -ENOMEM;
164
165 return 0;
166}
167
168struct bus_type fw_bus_type = {
169 .name = "firewire",
170 .match = fw_unit_match,
171};
172EXPORT_SYMBOL(fw_bus_type);
173
174int fw_device_enable_phys_dma(struct fw_device *device)
175{
176 int generation = device->generation;
177
178
179 smp_rmb();
180
181 return device->card->driver->enable_phys_dma(device->card,
182 device->node_id,
183 generation);
184}
185EXPORT_SYMBOL(fw_device_enable_phys_dma);
186
187struct config_rom_attribute {
188 struct device_attribute attr;
189 u32 key;
190};
191
192static ssize_t show_immediate(struct device *dev,
193 struct device_attribute *dattr, char *buf)
194{
195 struct config_rom_attribute *attr =
196 container_of(dattr, struct config_rom_attribute, attr);
197 struct fw_csr_iterator ci;
198 u32 *dir;
199 int key, value, ret = -ENOENT;
200
201 down_read(&fw_device_rwsem);
202
203 if (is_fw_unit(dev))
204 dir = fw_unit(dev)->directory;
205 else
206 dir = fw_device(dev)->config_rom + 5;
207
208 fw_csr_iterator_init(&ci, dir);
209 while (fw_csr_iterator_next(&ci, &key, &value))
210 if (attr->key == key) {
211 ret = snprintf(buf, buf ? PAGE_SIZE : 0,
212 "0x%06x\n", value);
213 break;
214 }
215
216 up_read(&fw_device_rwsem);
217
218 return ret;
219}
220
221#define IMMEDIATE_ATTR(name, key) \
222 { __ATTR(name, S_IRUGO, show_immediate, NULL), key }
223
224static ssize_t show_text_leaf(struct device *dev,
225 struct device_attribute *dattr, char *buf)
226{
227 struct config_rom_attribute *attr =
228 container_of(dattr, struct config_rom_attribute, attr);
229 struct fw_csr_iterator ci;
230 u32 *dir, *block = NULL, *p, *end;
231 int length, key, value, last_key = 0, ret = -ENOENT;
232 char *b;
233
234 down_read(&fw_device_rwsem);
235
236 if (is_fw_unit(dev))
237 dir = fw_unit(dev)->directory;
238 else
239 dir = fw_device(dev)->config_rom + 5;
240
241 fw_csr_iterator_init(&ci, dir);
242 while (fw_csr_iterator_next(&ci, &key, &value)) {
243 if (attr->key == last_key &&
244 key == (CSR_DESCRIPTOR | CSR_LEAF))
245 block = ci.p - 1 + value;
246 last_key = key;
247 }
248
249 if (block == NULL)
250 goto out;
251
252 length = min(block[0] >> 16, 256U);
253 if (length < 3)
254 goto out;
255
256 if (block[1] != 0 || block[2] != 0)
257
258 goto out;
259
260 if (buf == NULL) {
261 ret = length * 4;
262 goto out;
263 }
264
265 b = buf;
266 end = &block[length + 1];
267 for (p = &block[3]; p < end; p++, b += 4)
268 * (u32 *) b = (__force u32) __cpu_to_be32(*p);
269
270
271 while (b--, (isspace(*b) || *b == '\0') && b > buf);
272 strcpy(b + 1, "\n");
273 ret = b + 2 - buf;
274 out:
275 up_read(&fw_device_rwsem);
276
277 return ret;
278}
279
280#define TEXT_LEAF_ATTR(name, key) \
281 { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key }
282
283static struct config_rom_attribute config_rom_attributes[] = {
284 IMMEDIATE_ATTR(vendor, CSR_VENDOR),
285 IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION),
286 IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID),
287 IMMEDIATE_ATTR(version, CSR_VERSION),
288 IMMEDIATE_ATTR(model, CSR_MODEL),
289 TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR),
290 TEXT_LEAF_ATTR(model_name, CSR_MODEL),
291 TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION),
292};
293
294static void init_fw_attribute_group(struct device *dev,
295 struct device_attribute *attrs,
296 struct fw_attribute_group *group)
297{
298 struct device_attribute *attr;
299 int i, j;
300
301 for (j = 0; attrs[j].attr.name != NULL; j++)
302 group->attrs[j] = &attrs[j].attr;
303
304 for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) {
305 attr = &config_rom_attributes[i].attr;
306 if (attr->show(dev, attr, NULL) < 0)
307 continue;
308 group->attrs[j++] = &attr->attr;
309 }
310
311 group->attrs[j] = NULL;
312 group->groups[0] = &group->group;
313 group->groups[1] = NULL;
314 group->group.attrs = group->attrs;
315 dev->groups = (const struct attribute_group **) group->groups;
316}
317
318static ssize_t modalias_show(struct device *dev,
319 struct device_attribute *attr, char *buf)
320{
321 struct fw_unit *unit = fw_unit(dev);
322 int length;
323
324 length = get_modalias(unit, buf, PAGE_SIZE);
325 strcpy(buf + length, "\n");
326
327 return length + 1;
328}
329
330static ssize_t rom_index_show(struct device *dev,
331 struct device_attribute *attr, char *buf)
332{
333 struct fw_device *device = fw_device(dev->parent);
334 struct fw_unit *unit = fw_unit(dev);
335
336 return snprintf(buf, PAGE_SIZE, "%d\n",
337 (int)(unit->directory - device->config_rom));
338}
339
340static struct device_attribute fw_unit_attributes[] = {
341 __ATTR_RO(modalias),
342 __ATTR_RO(rom_index),
343 __ATTR_NULL,
344};
345
346static ssize_t config_rom_show(struct device *dev,
347 struct device_attribute *attr, char *buf)
348{
349 struct fw_device *device = fw_device(dev);
350 size_t length;
351
352 down_read(&fw_device_rwsem);
353 length = device->config_rom_length * 4;
354 memcpy(buf, device->config_rom, length);
355 up_read(&fw_device_rwsem);
356
357 return length;
358}
359
360static ssize_t guid_show(struct device *dev,
361 struct device_attribute *attr, char *buf)
362{
363 struct fw_device *device = fw_device(dev);
364 int ret;
365
366 down_read(&fw_device_rwsem);
367 ret = snprintf(buf, PAGE_SIZE, "0x%08x%08x\n",
368 device->config_rom[3], device->config_rom[4]);
369 up_read(&fw_device_rwsem);
370
371 return ret;
372}
373
374static int units_sprintf(char *buf, u32 *directory)
375{
376 struct fw_csr_iterator ci;
377 int key, value;
378 int specifier_id = 0;
379 int version = 0;
380
381 fw_csr_iterator_init(&ci, directory);
382 while (fw_csr_iterator_next(&ci, &key, &value)) {
383 switch (key) {
384 case CSR_SPECIFIER_ID:
385 specifier_id = value;
386 break;
387 case CSR_VERSION:
388 version = value;
389 break;
390 }
391 }
392
393 return sprintf(buf, "0x%06x:0x%06x ", specifier_id, version);
394}
395
396static ssize_t units_show(struct device *dev,
397 struct device_attribute *attr, char *buf)
398{
399 struct fw_device *device = fw_device(dev);
400 struct fw_csr_iterator ci;
401 int key, value, i = 0;
402
403 down_read(&fw_device_rwsem);
404 fw_csr_iterator_init(&ci, &device->config_rom[5]);
405 while (fw_csr_iterator_next(&ci, &key, &value)) {
406 if (key != (CSR_UNIT | CSR_DIRECTORY))
407 continue;
408 i += units_sprintf(&buf[i], ci.p + value - 1);
409 if (i >= PAGE_SIZE - (8 + 1 + 8 + 1))
410 break;
411 }
412 up_read(&fw_device_rwsem);
413
414 if (i)
415 buf[i - 1] = '\n';
416
417 return i;
418}
419
420static struct device_attribute fw_device_attributes[] = {
421 __ATTR_RO(config_rom),
422 __ATTR_RO(guid),
423 __ATTR_RO(units),
424 __ATTR_NULL,
425};
426
427static int read_rom(struct fw_device *device,
428 int generation, int index, u32 *data)
429{
430 int rcode;
431
432
433 smp_rmb();
434
435 rcode = fw_run_transaction(device->card, TCODE_READ_QUADLET_REQUEST,
436 device->node_id, generation, device->max_speed,
437 (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4,
438 data, 4);
439 be32_to_cpus(data);
440
441 return rcode;
442}
443
444#define READ_BIB_ROM_SIZE 256
445#define READ_BIB_STACK_SIZE 16
446
447
448
449
450
451
452
453
454static int read_bus_info_block(struct fw_device *device, int generation)
455{
456 u32 *rom, *stack, *old_rom, *new_rom;
457 u32 sp, key;
458 int i, end, length, ret = -1;
459
460 rom = kmalloc(sizeof(*rom) * READ_BIB_ROM_SIZE +
461 sizeof(*stack) * READ_BIB_STACK_SIZE, GFP_KERNEL);
462 if (rom == NULL)
463 return -ENOMEM;
464
465 stack = &rom[READ_BIB_ROM_SIZE];
466
467 device->max_speed = SCODE_100;
468
469
470 for (i = 0; i < 5; i++) {
471 if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE)
472 goto out;
473
474
475
476
477
478
479
480
481 if (i == 0 && rom[i] == 0)
482 goto out;
483 }
484
485 device->max_speed = device->node->max_speed;
486
487
488
489
490
491
492
493
494
495
496 if ((rom[2] & 0x7) < device->max_speed ||
497 device->max_speed == SCODE_BETA ||
498 device->card->beta_repeaters_present) {
499 u32 dummy;
500
501
502 if (device->max_speed == SCODE_BETA)
503 device->max_speed = device->card->link_speed;
504
505 while (device->max_speed > SCODE_100) {
506 if (read_rom(device, generation, 0, &dummy) ==
507 RCODE_COMPLETE)
508 break;
509 device->max_speed--;
510 }
511 }
512
513
514
515
516
517
518
519
520 length = i;
521 sp = 0;
522 stack[sp++] = 0xc0000005;
523 while (sp > 0) {
524
525
526
527
528
529
530 key = stack[--sp];
531 i = key & 0xffffff;
532 if (i >= READ_BIB_ROM_SIZE)
533
534
535
536
537 goto out;
538
539
540 if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE)
541 goto out;
542 end = i + (rom[i] >> 16) + 1;
543 i++;
544 if (end > READ_BIB_ROM_SIZE)
545
546
547
548
549
550
551 goto out;
552
553
554
555
556
557
558 while (i < end) {
559 if (read_rom(device, generation, i, &rom[i]) !=
560 RCODE_COMPLETE)
561 goto out;
562 if ((key >> 30) == 3 && (rom[i] >> 30) > 1 &&
563 sp < READ_BIB_STACK_SIZE)
564 stack[sp++] = i + rom[i];
565 i++;
566 }
567 if (length < i)
568 length = i;
569 }
570
571 old_rom = device->config_rom;
572 new_rom = kmemdup(rom, length * 4, GFP_KERNEL);
573 if (new_rom == NULL)
574 goto out;
575
576 down_write(&fw_device_rwsem);
577 device->config_rom = new_rom;
578 device->config_rom_length = length;
579 up_write(&fw_device_rwsem);
580
581 kfree(old_rom);
582 ret = 0;
583 device->max_rec = rom[2] >> 12 & 0xf;
584 device->cmc = rom[2] >> 30 & 1;
585 device->irmc = rom[2] >> 31 & 1;
586 out:
587 kfree(rom);
588
589 return ret;
590}
591
592static void fw_unit_release(struct device *dev)
593{
594 struct fw_unit *unit = fw_unit(dev);
595
596 kfree(unit);
597}
598
599static struct device_type fw_unit_type = {
600 .uevent = fw_unit_uevent,
601 .release = fw_unit_release,
602};
603
604static bool is_fw_unit(struct device *dev)
605{
606 return dev->type == &fw_unit_type;
607}
608
609static void create_units(struct fw_device *device)
610{
611 struct fw_csr_iterator ci;
612 struct fw_unit *unit;
613 int key, value, i;
614
615 i = 0;
616 fw_csr_iterator_init(&ci, &device->config_rom[5]);
617 while (fw_csr_iterator_next(&ci, &key, &value)) {
618 if (key != (CSR_UNIT | CSR_DIRECTORY))
619 continue;
620
621
622
623
624
625 unit = kzalloc(sizeof(*unit), GFP_KERNEL);
626 if (unit == NULL) {
627 fw_error("failed to allocate memory for unit\n");
628 continue;
629 }
630
631 unit->directory = ci.p + value - 1;
632 unit->device.bus = &fw_bus_type;
633 unit->device.type = &fw_unit_type;
634 unit->device.parent = &device->device;
635 dev_set_name(&unit->device, "%s.%d", dev_name(&device->device), i++);
636
637 BUILD_BUG_ON(ARRAY_SIZE(unit->attribute_group.attrs) <
638 ARRAY_SIZE(fw_unit_attributes) +
639 ARRAY_SIZE(config_rom_attributes));
640 init_fw_attribute_group(&unit->device,
641 fw_unit_attributes,
642 &unit->attribute_group);
643
644 if (device_register(&unit->device) < 0)
645 goto skip_unit;
646
647 continue;
648
649 skip_unit:
650 kfree(unit);
651 }
652}
653
654static int shutdown_unit(struct device *device, void *data)
655{
656 device_unregister(device);
657
658 return 0;
659}
660
661
662
663
664
665
666
667DECLARE_RWSEM(fw_device_rwsem);
668
669DEFINE_IDR(fw_device_idr);
670int fw_cdev_major;
671
672struct fw_device *fw_device_get_by_devt(dev_t devt)
673{
674 struct fw_device *device;
675
676 down_read(&fw_device_rwsem);
677 device = idr_find(&fw_device_idr, MINOR(devt));
678 if (device)
679 fw_device_get(device);
680 up_read(&fw_device_rwsem);
681
682 return device;
683}
684
685
686
687
688
689
690
691
692
693
694
695
696#define MAX_RETRIES 10
697#define RETRY_DELAY (3 * HZ)
698#define INITIAL_DELAY (HZ / 2)
699#define SHUTDOWN_DELAY (2 * HZ)
700
701static void fw_device_shutdown(struct work_struct *work)
702{
703 struct fw_device *device =
704 container_of(work, struct fw_device, work.work);
705 int minor = MINOR(device->device.devt);
706
707 if (time_is_after_jiffies(device->card->reset_jiffies + SHUTDOWN_DELAY)
708 && !list_empty(&device->card->link)) {
709 schedule_delayed_work(&device->work, SHUTDOWN_DELAY);
710 return;
711 }
712
713 if (atomic_cmpxchg(&device->state,
714 FW_DEVICE_GONE,
715 FW_DEVICE_SHUTDOWN) != FW_DEVICE_GONE)
716 return;
717
718 fw_device_cdev_remove(device);
719 device_for_each_child(&device->device, NULL, shutdown_unit);
720 device_unregister(&device->device);
721
722 down_write(&fw_device_rwsem);
723 idr_remove(&fw_device_idr, minor);
724 up_write(&fw_device_rwsem);
725
726 fw_device_put(device);
727}
728
729static void fw_device_release(struct device *dev)
730{
731 struct fw_device *device = fw_device(dev);
732 struct fw_card *card = device->card;
733 unsigned long flags;
734
735
736
737
738
739
740 spin_lock_irqsave(&card->lock, flags);
741 device->node->data = NULL;
742 spin_unlock_irqrestore(&card->lock, flags);
743
744 fw_node_put(device->node);
745 kfree(device->config_rom);
746 kfree(device);
747 fw_card_put(card);
748}
749
750static struct device_type fw_device_type = {
751 .release = fw_device_release,
752};
753
754static bool is_fw_device(struct device *dev)
755{
756 return dev->type == &fw_device_type;
757}
758
759static int update_unit(struct device *dev, void *data)
760{
761 struct fw_unit *unit = fw_unit(dev);
762 struct fw_driver *driver = (struct fw_driver *)dev->driver;
763
764 if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) {
765 down(&dev->sem);
766 driver->update(unit);
767 up(&dev->sem);
768 }
769
770 return 0;
771}
772
773static void fw_device_update(struct work_struct *work)
774{
775 struct fw_device *device =
776 container_of(work, struct fw_device, work.work);
777
778 fw_device_cdev_update(device);
779 device_for_each_child(&device->device, NULL, update_unit);
780}
781
782
783
784
785
786
787
788static int lookup_existing_device(struct device *dev, void *data)
789{
790 struct fw_device *old = fw_device(dev);
791 struct fw_device *new = data;
792 struct fw_card *card = new->card;
793 int match = 0;
794
795 if (!is_fw_device(dev))
796 return 0;
797
798 down_read(&fw_device_rwsem);
799 spin_lock_irq(&card->lock);
800
801 if (memcmp(old->config_rom, new->config_rom, 6 * 4) == 0 &&
802 atomic_cmpxchg(&old->state,
803 FW_DEVICE_GONE,
804 FW_DEVICE_RUNNING) == FW_DEVICE_GONE) {
805 struct fw_node *current_node = new->node;
806 struct fw_node *obsolete_node = old->node;
807
808 new->node = obsolete_node;
809 new->node->data = new;
810 old->node = current_node;
811 old->node->data = old;
812
813 old->max_speed = new->max_speed;
814 old->node_id = current_node->node_id;
815 smp_wmb();
816 old->generation = card->generation;
817 old->config_rom_retries = 0;
818 fw_notify("rediscovered device %s\n", dev_name(dev));
819
820 PREPARE_DELAYED_WORK(&old->work, fw_device_update);
821 schedule_delayed_work(&old->work, 0);
822
823 if (current_node == card->root_node)
824 fw_schedule_bm_work(card, 0);
825
826 match = 1;
827 }
828
829 spin_unlock_irq(&card->lock);
830 up_read(&fw_device_rwsem);
831
832 return match;
833}
834
835enum { BC_UNKNOWN = 0, BC_UNIMPLEMENTED, BC_IMPLEMENTED, };
836
837static void set_broadcast_channel(struct fw_device *device, int generation)
838{
839 struct fw_card *card = device->card;
840 __be32 data;
841 int rcode;
842
843 if (!card->broadcast_channel_allocated)
844 return;
845
846
847
848
849
850
851
852
853 if (!device->irmc || device->max_rec < 8)
854 return;
855
856
857
858
859
860 if (device->bc_implemented == BC_UNKNOWN) {
861 rcode = fw_run_transaction(card, TCODE_READ_QUADLET_REQUEST,
862 device->node_id, generation, device->max_speed,
863 CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL,
864 &data, 4);
865 switch (rcode) {
866 case RCODE_COMPLETE:
867 if (data & cpu_to_be32(1 << 31)) {
868 device->bc_implemented = BC_IMPLEMENTED;
869 break;
870 }
871
872 case RCODE_ADDRESS_ERROR:
873 device->bc_implemented = BC_UNIMPLEMENTED;
874 }
875 }
876
877 if (device->bc_implemented == BC_IMPLEMENTED) {
878 data = cpu_to_be32(BROADCAST_CHANNEL_INITIAL |
879 BROADCAST_CHANNEL_VALID);
880 fw_run_transaction(card, TCODE_WRITE_QUADLET_REQUEST,
881 device->node_id, generation, device->max_speed,
882 CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL,
883 &data, 4);
884 }
885}
886
887int fw_device_set_broadcast_channel(struct device *dev, void *gen)
888{
889 if (is_fw_device(dev))
890 set_broadcast_channel(fw_device(dev), (long)gen);
891
892 return 0;
893}
894
895static void fw_device_init(struct work_struct *work)
896{
897 struct fw_device *device =
898 container_of(work, struct fw_device, work.work);
899 struct device *revived_dev;
900 int minor, ret;
901
902
903
904
905
906
907
908 if (read_bus_info_block(device, device->generation) < 0) {
909 if (device->config_rom_retries < MAX_RETRIES &&
910 atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
911 device->config_rom_retries++;
912 schedule_delayed_work(&device->work, RETRY_DELAY);
913 } else {
914 fw_notify("giving up on config rom for node id %x\n",
915 device->node_id);
916 if (device->node == device->card->root_node)
917 fw_schedule_bm_work(device->card, 0);
918 fw_device_release(&device->device);
919 }
920 return;
921 }
922
923 revived_dev = device_find_child(device->card->device,
924 device, lookup_existing_device);
925 if (revived_dev) {
926 put_device(revived_dev);
927 fw_device_release(&device->device);
928
929 return;
930 }
931
932 device_initialize(&device->device);
933
934 fw_device_get(device);
935 down_write(&fw_device_rwsem);
936 ret = idr_pre_get(&fw_device_idr, GFP_KERNEL) ?
937 idr_get_new(&fw_device_idr, device, &minor) :
938 -ENOMEM;
939 up_write(&fw_device_rwsem);
940
941 if (ret < 0)
942 goto error;
943
944 device->device.bus = &fw_bus_type;
945 device->device.type = &fw_device_type;
946 device->device.parent = device->card->device;
947 device->device.devt = MKDEV(fw_cdev_major, minor);
948 dev_set_name(&device->device, "fw%d", minor);
949
950 BUILD_BUG_ON(ARRAY_SIZE(device->attribute_group.attrs) <
951 ARRAY_SIZE(fw_device_attributes) +
952 ARRAY_SIZE(config_rom_attributes));
953 init_fw_attribute_group(&device->device,
954 fw_device_attributes,
955 &device->attribute_group);
956
957 if (device_add(&device->device)) {
958 fw_error("Failed to add device.\n");
959 goto error_with_cdev;
960 }
961
962 create_units(device);
963
964
965
966
967
968
969
970
971
972
973 if (atomic_cmpxchg(&device->state,
974 FW_DEVICE_INITIALIZING,
975 FW_DEVICE_RUNNING) == FW_DEVICE_GONE) {
976 PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown);
977 schedule_delayed_work(&device->work, SHUTDOWN_DELAY);
978 } else {
979 if (device->config_rom_retries)
980 fw_notify("created device %s: GUID %08x%08x, S%d00, "
981 "%d config ROM retries\n",
982 dev_name(&device->device),
983 device->config_rom[3], device->config_rom[4],
984 1 << device->max_speed,
985 device->config_rom_retries);
986 else
987 fw_notify("created device %s: GUID %08x%08x, S%d00\n",
988 dev_name(&device->device),
989 device->config_rom[3], device->config_rom[4],
990 1 << device->max_speed);
991 device->config_rom_retries = 0;
992
993 set_broadcast_channel(device, device->generation);
994 }
995
996
997
998
999
1000
1001
1002 if (device->node == device->card->root_node)
1003 fw_schedule_bm_work(device->card, 0);
1004
1005 return;
1006
1007 error_with_cdev:
1008 down_write(&fw_device_rwsem);
1009 idr_remove(&fw_device_idr, minor);
1010 up_write(&fw_device_rwsem);
1011 error:
1012 fw_device_put(device);
1013
1014 put_device(&device->device);
1015}
1016
1017enum {
1018 REREAD_BIB_ERROR,
1019 REREAD_BIB_GONE,
1020 REREAD_BIB_UNCHANGED,
1021 REREAD_BIB_CHANGED,
1022};
1023
1024
1025static int reread_bus_info_block(struct fw_device *device, int generation)
1026{
1027 u32 q;
1028 int i;
1029
1030 for (i = 0; i < 6; i++) {
1031 if (read_rom(device, generation, i, &q) != RCODE_COMPLETE)
1032 return REREAD_BIB_ERROR;
1033
1034 if (i == 0 && q == 0)
1035 return REREAD_BIB_GONE;
1036
1037 if (q != device->config_rom[i])
1038 return REREAD_BIB_CHANGED;
1039 }
1040
1041 return REREAD_BIB_UNCHANGED;
1042}
1043
1044static void fw_device_refresh(struct work_struct *work)
1045{
1046 struct fw_device *device =
1047 container_of(work, struct fw_device, work.work);
1048 struct fw_card *card = device->card;
1049 int node_id = device->node_id;
1050
1051 switch (reread_bus_info_block(device, device->generation)) {
1052 case REREAD_BIB_ERROR:
1053 if (device->config_rom_retries < MAX_RETRIES / 2 &&
1054 atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
1055 device->config_rom_retries++;
1056 schedule_delayed_work(&device->work, RETRY_DELAY / 2);
1057
1058 return;
1059 }
1060 goto give_up;
1061
1062 case REREAD_BIB_GONE:
1063 goto gone;
1064
1065 case REREAD_BIB_UNCHANGED:
1066 if (atomic_cmpxchg(&device->state,
1067 FW_DEVICE_INITIALIZING,
1068 FW_DEVICE_RUNNING) == FW_DEVICE_GONE)
1069 goto gone;
1070
1071 fw_device_update(work);
1072 device->config_rom_retries = 0;
1073 goto out;
1074
1075 case REREAD_BIB_CHANGED:
1076 break;
1077 }
1078
1079
1080
1081
1082
1083 device_for_each_child(&device->device, NULL, shutdown_unit);
1084
1085 if (read_bus_info_block(device, device->generation) < 0) {
1086 if (device->config_rom_retries < MAX_RETRIES &&
1087 atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
1088 device->config_rom_retries++;
1089 schedule_delayed_work(&device->work, RETRY_DELAY);
1090
1091 return;
1092 }
1093 goto give_up;
1094 }
1095
1096 create_units(device);
1097
1098
1099 kobject_uevent(&device->device.kobj, KOBJ_CHANGE);
1100
1101 if (atomic_cmpxchg(&device->state,
1102 FW_DEVICE_INITIALIZING,
1103 FW_DEVICE_RUNNING) == FW_DEVICE_GONE)
1104 goto gone;
1105
1106 fw_notify("refreshed device %s\n", dev_name(&device->device));
1107 device->config_rom_retries = 0;
1108 goto out;
1109
1110 give_up:
1111 fw_notify("giving up on refresh of device %s\n", dev_name(&device->device));
1112 gone:
1113 atomic_set(&device->state, FW_DEVICE_GONE);
1114 PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown);
1115 schedule_delayed_work(&device->work, SHUTDOWN_DELAY);
1116 out:
1117 if (node_id == card->root_node->node_id)
1118 fw_schedule_bm_work(card, 0);
1119}
1120
1121void fw_node_event(struct fw_card *card, struct fw_node *node, int event)
1122{
1123 struct fw_device *device;
1124
1125 switch (event) {
1126 case FW_NODE_CREATED:
1127 case FW_NODE_LINK_ON:
1128 if (!node->link_on)
1129 break;
1130 create:
1131 device = kzalloc(sizeof(*device), GFP_ATOMIC);
1132 if (device == NULL)
1133 break;
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145 atomic_set(&device->state, FW_DEVICE_INITIALIZING);
1146 device->card = fw_card_get(card);
1147 device->node = fw_node_get(node);
1148 device->node_id = node->node_id;
1149 device->generation = card->generation;
1150 device->is_local = node == card->local_node;
1151 mutex_init(&device->client_list_mutex);
1152 INIT_LIST_HEAD(&device->client_list);
1153
1154
1155
1156
1157
1158
1159 node->data = device;
1160
1161
1162
1163
1164
1165
1166
1167 INIT_DELAYED_WORK(&device->work, fw_device_init);
1168 schedule_delayed_work(&device->work, INITIAL_DELAY);
1169 break;
1170
1171 case FW_NODE_INITIATED_RESET:
1172 device = node->data;
1173 if (device == NULL)
1174 goto create;
1175
1176 device->node_id = node->node_id;
1177 smp_wmb();
1178 device->generation = card->generation;
1179 if (atomic_cmpxchg(&device->state,
1180 FW_DEVICE_RUNNING,
1181 FW_DEVICE_INITIALIZING) == FW_DEVICE_RUNNING) {
1182 PREPARE_DELAYED_WORK(&device->work, fw_device_refresh);
1183 schedule_delayed_work(&device->work,
1184 device->is_local ? 0 : INITIAL_DELAY);
1185 }
1186 break;
1187
1188 case FW_NODE_UPDATED:
1189 if (!node->link_on || node->data == NULL)
1190 break;
1191
1192 device = node->data;
1193 device->node_id = node->node_id;
1194 smp_wmb();
1195 device->generation = card->generation;
1196 if (atomic_read(&device->state) == FW_DEVICE_RUNNING) {
1197 PREPARE_DELAYED_WORK(&device->work, fw_device_update);
1198 schedule_delayed_work(&device->work, 0);
1199 }
1200 break;
1201
1202 case FW_NODE_DESTROYED:
1203 case FW_NODE_LINK_OFF:
1204 if (!node->data)
1205 break;
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219 device = node->data;
1220 if (atomic_xchg(&device->state,
1221 FW_DEVICE_GONE) == FW_DEVICE_RUNNING) {
1222 PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown);
1223 schedule_delayed_work(&device->work,
1224 list_empty(&card->link) ? 0 : SHUTDOWN_DELAY);
1225 }
1226 break;
1227 }
1228}
1229