1
2
3
4#include <linux/acpi.h>
5#include <linux/delay.h>
6#include <linux/mod_devicetable.h>
7#include <linux/pm_runtime.h>
8#include <linux/soundwire/sdw_registers.h>
9#include <linux/soundwire/sdw.h>
10#include "bus.h"
11#include "sysfs_local.h"
12
13static DEFINE_IDA(sdw_ida);
14
15static int sdw_get_id(struct sdw_bus *bus)
16{
17 int rc = ida_alloc(&sdw_ida, GFP_KERNEL);
18
19 if (rc < 0)
20 return rc;
21
22 bus->id = rc;
23 return 0;
24}
25
26
27
28
29
30
31
32
33
34
35int sdw_bus_master_add(struct sdw_bus *bus, struct device *parent,
36 struct fwnode_handle *fwnode)
37{
38 struct sdw_master_prop *prop = NULL;
39 int ret;
40
41 if (!parent) {
42 pr_err("SoundWire parent device is not set\n");
43 return -ENODEV;
44 }
45
46 ret = sdw_get_id(bus);
47 if (ret) {
48 dev_err(parent, "Failed to get bus id\n");
49 return ret;
50 }
51
52 ret = sdw_master_device_add(bus, parent, fwnode);
53 if (ret) {
54 dev_err(parent, "Failed to add master device at link %d\n",
55 bus->link_id);
56 return ret;
57 }
58
59 if (!bus->ops) {
60 dev_err(bus->dev, "SoundWire Bus ops are not set\n");
61 return -EINVAL;
62 }
63
64 if (!bus->compute_params) {
65 dev_err(bus->dev,
66 "Bandwidth allocation not configured, compute_params no set\n");
67 return -EINVAL;
68 }
69
70 mutex_init(&bus->msg_lock);
71 mutex_init(&bus->bus_lock);
72 INIT_LIST_HEAD(&bus->slaves);
73 INIT_LIST_HEAD(&bus->m_rt_list);
74
75
76
77
78
79 bus->multi_link = false;
80 if (bus->ops->read_prop) {
81 ret = bus->ops->read_prop(bus);
82 if (ret < 0) {
83 dev_err(bus->dev,
84 "Bus read properties failed:%d\n", ret);
85 return ret;
86 }
87 }
88
89 sdw_bus_debugfs_init(bus);
90
91
92
93
94
95
96
97
98
99 *bus->assigned = ~GENMASK(SDW_BROADCAST_DEV_NUM, SDW_ENUM_DEV_NUM);
100
101
102 set_bit(SDW_ENUM_DEV_NUM, bus->assigned);
103 set_bit(SDW_BROADCAST_DEV_NUM, bus->assigned);
104
105
106 set_bit(SDW_GROUP12_DEV_NUM, bus->assigned);
107 set_bit(SDW_GROUP13_DEV_NUM, bus->assigned);
108 set_bit(SDW_MASTER_DEV_NUM, bus->assigned);
109
110
111
112
113
114
115
116
117 if (IS_ENABLED(CONFIG_ACPI) && ACPI_HANDLE(bus->dev))
118 ret = sdw_acpi_find_slaves(bus);
119 else if (IS_ENABLED(CONFIG_OF) && bus->dev->of_node)
120 ret = sdw_of_find_slaves(bus);
121 else
122 ret = -ENOTSUPP;
123
124 if (ret) {
125 dev_err(bus->dev, "Finding slaves failed:%d\n", ret);
126 return ret;
127 }
128
129
130
131
132
133
134
135
136
137
138 prop = &bus->prop;
139 bus->params.max_dr_freq = prop->max_clk_freq * SDW_DOUBLE_RATE_FACTOR;
140 bus->params.curr_dr_freq = bus->params.max_dr_freq;
141 bus->params.curr_bank = SDW_BANK0;
142 bus->params.next_bank = SDW_BANK1;
143
144 return 0;
145}
146EXPORT_SYMBOL(sdw_bus_master_add);
147
148static int sdw_delete_slave(struct device *dev, void *data)
149{
150 struct sdw_slave *slave = dev_to_sdw_dev(dev);
151 struct sdw_bus *bus = slave->bus;
152
153 pm_runtime_disable(dev);
154
155 sdw_slave_debugfs_exit(slave);
156
157 mutex_lock(&bus->bus_lock);
158
159 if (slave->dev_num)
160 clear_bit(slave->dev_num, bus->assigned);
161
162 list_del_init(&slave->node);
163 mutex_unlock(&bus->bus_lock);
164
165 device_unregister(dev);
166 return 0;
167}
168
169
170
171
172
173
174
175void sdw_bus_master_delete(struct sdw_bus *bus)
176{
177 device_for_each_child(bus->dev, NULL, sdw_delete_slave);
178 sdw_master_device_del(bus);
179
180 sdw_bus_debugfs_exit(bus);
181 ida_free(&sdw_ida, bus->id);
182}
183EXPORT_SYMBOL(sdw_bus_master_delete);
184
185
186
187
188
189static inline int find_response_code(enum sdw_command_response resp)
190{
191 switch (resp) {
192 case SDW_CMD_OK:
193 return 0;
194
195 case SDW_CMD_IGNORED:
196 return -ENODATA;
197
198 case SDW_CMD_TIMEOUT:
199 return -ETIMEDOUT;
200
201 default:
202 return -EIO;
203 }
204}
205
206static inline int do_transfer(struct sdw_bus *bus, struct sdw_msg *msg)
207{
208 int retry = bus->prop.err_threshold;
209 enum sdw_command_response resp;
210 int ret = 0, i;
211
212 for (i = 0; i <= retry; i++) {
213 resp = bus->ops->xfer_msg(bus, msg);
214 ret = find_response_code(resp);
215
216
217 if (ret == 0 || ret == -ENODATA)
218 return ret;
219 }
220
221 return ret;
222}
223
224static inline int do_transfer_defer(struct sdw_bus *bus,
225 struct sdw_msg *msg,
226 struct sdw_defer *defer)
227{
228 int retry = bus->prop.err_threshold;
229 enum sdw_command_response resp;
230 int ret = 0, i;
231
232 defer->msg = msg;
233 defer->length = msg->len;
234 init_completion(&defer->complete);
235
236 for (i = 0; i <= retry; i++) {
237 resp = bus->ops->xfer_msg_defer(bus, msg, defer);
238 ret = find_response_code(resp);
239
240 if (ret == 0 || ret == -ENODATA)
241 return ret;
242 }
243
244 return ret;
245}
246
247static int sdw_reset_page(struct sdw_bus *bus, u16 dev_num)
248{
249 int retry = bus->prop.err_threshold;
250 enum sdw_command_response resp;
251 int ret = 0, i;
252
253 for (i = 0; i <= retry; i++) {
254 resp = bus->ops->reset_page_addr(bus, dev_num);
255 ret = find_response_code(resp);
256
257 if (ret == 0 || ret == -ENODATA)
258 return ret;
259 }
260
261 return ret;
262}
263
264static int sdw_transfer_unlocked(struct sdw_bus *bus, struct sdw_msg *msg)
265{
266 int ret;
267
268 ret = do_transfer(bus, msg);
269 if (ret != 0 && ret != -ENODATA)
270 dev_err(bus->dev, "trf on Slave %d failed:%d\n",
271 msg->dev_num, ret);
272
273 if (msg->page)
274 sdw_reset_page(bus, msg->dev_num);
275
276 return ret;
277}
278
279
280
281
282
283
284int sdw_transfer(struct sdw_bus *bus, struct sdw_msg *msg)
285{
286 int ret;
287
288 mutex_lock(&bus->msg_lock);
289
290 ret = sdw_transfer_unlocked(bus, msg);
291
292 mutex_unlock(&bus->msg_lock);
293
294 return ret;
295}
296
297
298
299
300
301
302
303
304
305int sdw_transfer_defer(struct sdw_bus *bus, struct sdw_msg *msg,
306 struct sdw_defer *defer)
307{
308 int ret;
309
310 if (!bus->ops->xfer_msg_defer)
311 return -ENOTSUPP;
312
313 ret = do_transfer_defer(bus, msg, defer);
314 if (ret != 0 && ret != -ENODATA)
315 dev_err(bus->dev, "Defer trf on Slave %d failed:%d\n",
316 msg->dev_num, ret);
317
318 if (msg->page)
319 sdw_reset_page(bus, msg->dev_num);
320
321 return ret;
322}
323
324int sdw_fill_msg(struct sdw_msg *msg, struct sdw_slave *slave,
325 u32 addr, size_t count, u16 dev_num, u8 flags, u8 *buf)
326{
327 memset(msg, 0, sizeof(*msg));
328 msg->addr = addr;
329 msg->len = count;
330 msg->dev_num = dev_num;
331 msg->flags = flags;
332 msg->buf = buf;
333
334 if (addr < SDW_REG_NO_PAGE)
335 return 0;
336
337 if (addr >= SDW_REG_MAX) {
338 pr_err("SDW: Invalid address %x passed\n", addr);
339 return -EINVAL;
340 }
341
342 if (addr < SDW_REG_OPTIONAL_PAGE) {
343 if (slave && !slave->prop.paging_support)
344 return 0;
345
346 }
347
348
349 if (dev_num == SDW_ENUM_DEV_NUM || dev_num == SDW_BROADCAST_DEV_NUM) {
350 pr_err("SDW: Invalid device for paging :%d\n", dev_num);
351 return -EINVAL;
352 }
353
354 if (!slave) {
355 pr_err("SDW: No slave for paging addr\n");
356 return -EINVAL;
357 }
358
359 if (!slave->prop.paging_support) {
360 dev_err(&slave->dev,
361 "address %x needs paging but no support\n", addr);
362 return -EINVAL;
363 }
364
365 msg->addr_page1 = FIELD_GET(SDW_SCP_ADDRPAGE1_MASK, addr);
366 msg->addr_page2 = FIELD_GET(SDW_SCP_ADDRPAGE2_MASK, addr);
367 msg->addr |= BIT(15);
368 msg->page = true;
369
370 return 0;
371}
372
373
374
375
376
377
378
379
380static int
381sdw_nread_no_pm(struct sdw_slave *slave, u32 addr, size_t count, u8 *val)
382{
383 struct sdw_msg msg;
384 int ret;
385
386 ret = sdw_fill_msg(&msg, slave, addr, count,
387 slave->dev_num, SDW_MSG_FLAG_READ, val);
388 if (ret < 0)
389 return ret;
390
391 return sdw_transfer(slave->bus, &msg);
392}
393
394static int
395sdw_nwrite_no_pm(struct sdw_slave *slave, u32 addr, size_t count, u8 *val)
396{
397 struct sdw_msg msg;
398 int ret;
399
400 ret = sdw_fill_msg(&msg, slave, addr, count,
401 slave->dev_num, SDW_MSG_FLAG_WRITE, val);
402 if (ret < 0)
403 return ret;
404
405 return sdw_transfer(slave->bus, &msg);
406}
407
408static int sdw_write_no_pm(struct sdw_slave *slave, u32 addr, u8 value)
409{
410 return sdw_nwrite_no_pm(slave, addr, 1, &value);
411}
412
413static int
414sdw_bread_no_pm(struct sdw_bus *bus, u16 dev_num, u32 addr)
415{
416 struct sdw_msg msg;
417 u8 buf;
418 int ret;
419
420 ret = sdw_fill_msg(&msg, NULL, addr, 1, dev_num,
421 SDW_MSG_FLAG_READ, &buf);
422 if (ret)
423 return ret;
424
425 ret = sdw_transfer(bus, &msg);
426 if (ret < 0)
427 return ret;
428
429 return buf;
430}
431
432static int
433sdw_bwrite_no_pm(struct sdw_bus *bus, u16 dev_num, u32 addr, u8 value)
434{
435 struct sdw_msg msg;
436 int ret;
437
438 ret = sdw_fill_msg(&msg, NULL, addr, 1, dev_num,
439 SDW_MSG_FLAG_WRITE, &value);
440 if (ret)
441 return ret;
442
443 return sdw_transfer(bus, &msg);
444}
445
446int sdw_bread_no_pm_unlocked(struct sdw_bus *bus, u16 dev_num, u32 addr)
447{
448 struct sdw_msg msg;
449 u8 buf;
450 int ret;
451
452 ret = sdw_fill_msg(&msg, NULL, addr, 1, dev_num,
453 SDW_MSG_FLAG_READ, &buf);
454 if (ret)
455 return ret;
456
457 ret = sdw_transfer_unlocked(bus, &msg);
458 if (ret < 0)
459 return ret;
460
461 return buf;
462}
463EXPORT_SYMBOL(sdw_bread_no_pm_unlocked);
464
465int sdw_bwrite_no_pm_unlocked(struct sdw_bus *bus, u16 dev_num, u32 addr, u8 value)
466{
467 struct sdw_msg msg;
468 int ret;
469
470 ret = sdw_fill_msg(&msg, NULL, addr, 1, dev_num,
471 SDW_MSG_FLAG_WRITE, &value);
472 if (ret)
473 return ret;
474
475 return sdw_transfer_unlocked(bus, &msg);
476}
477EXPORT_SYMBOL(sdw_bwrite_no_pm_unlocked);
478
479static int
480sdw_read_no_pm(struct sdw_slave *slave, u32 addr)
481{
482 u8 buf;
483 int ret;
484
485 ret = sdw_nread_no_pm(slave, addr, 1, &buf);
486 if (ret < 0)
487 return ret;
488 else
489 return buf;
490}
491
492
493
494
495
496
497
498
499int sdw_nread(struct sdw_slave *slave, u32 addr, size_t count, u8 *val)
500{
501 int ret;
502
503 ret = pm_runtime_get_sync(slave->bus->dev);
504 if (ret < 0 && ret != -EACCES) {
505 pm_runtime_put_noidle(slave->bus->dev);
506 return ret;
507 }
508
509 ret = sdw_nread_no_pm(slave, addr, count, val);
510
511 pm_runtime_mark_last_busy(slave->bus->dev);
512 pm_runtime_put(slave->bus->dev);
513
514 return ret;
515}
516EXPORT_SYMBOL(sdw_nread);
517
518
519
520
521
522
523
524
525int sdw_nwrite(struct sdw_slave *slave, u32 addr, size_t count, u8 *val)
526{
527 int ret;
528
529 ret = pm_runtime_get_sync(slave->bus->dev);
530 if (ret < 0 && ret != -EACCES) {
531 pm_runtime_put_noidle(slave->bus->dev);
532 return ret;
533 }
534
535 ret = sdw_nwrite_no_pm(slave, addr, count, val);
536
537 pm_runtime_mark_last_busy(slave->bus->dev);
538 pm_runtime_put(slave->bus->dev);
539
540 return ret;
541}
542EXPORT_SYMBOL(sdw_nwrite);
543
544
545
546
547
548
549int sdw_read(struct sdw_slave *slave, u32 addr)
550{
551 u8 buf;
552 int ret;
553
554 ret = sdw_nread(slave, addr, 1, &buf);
555 if (ret < 0)
556 return ret;
557
558 return buf;
559}
560EXPORT_SYMBOL(sdw_read);
561
562
563
564
565
566
567
568int sdw_write(struct sdw_slave *slave, u32 addr, u8 value)
569{
570 return sdw_nwrite(slave, addr, 1, &value);
571}
572EXPORT_SYMBOL(sdw_write);
573
574
575
576
577
578
579static struct sdw_slave *sdw_get_slave(struct sdw_bus *bus, int i)
580{
581 struct sdw_slave *slave = NULL;
582
583 list_for_each_entry(slave, &bus->slaves, node) {
584 if (slave->dev_num == i)
585 return slave;
586 }
587
588 return NULL;
589}
590
591static int sdw_compare_devid(struct sdw_slave *slave, struct sdw_slave_id id)
592{
593 if (slave->id.mfg_id != id.mfg_id ||
594 slave->id.part_id != id.part_id ||
595 slave->id.class_id != id.class_id ||
596 (slave->id.unique_id != SDW_IGNORED_UNIQUE_ID &&
597 slave->id.unique_id != id.unique_id))
598 return -ENODEV;
599
600 return 0;
601}
602
603
604static int sdw_get_device_num(struct sdw_slave *slave)
605{
606 int bit;
607
608 bit = find_first_zero_bit(slave->bus->assigned, SDW_MAX_DEVICES);
609 if (bit == SDW_MAX_DEVICES) {
610 bit = -ENODEV;
611 goto err;
612 }
613
614
615
616
617
618 set_bit(bit, slave->bus->assigned);
619
620err:
621 return bit;
622}
623
624static int sdw_assign_device_num(struct sdw_slave *slave)
625{
626 int ret, dev_num;
627 bool new_device = false;
628
629
630 if (!slave->dev_num) {
631 if (!slave->dev_num_sticky) {
632 mutex_lock(&slave->bus->bus_lock);
633 dev_num = sdw_get_device_num(slave);
634 mutex_unlock(&slave->bus->bus_lock);
635 if (dev_num < 0) {
636 dev_err(slave->bus->dev, "Get dev_num failed: %d\n",
637 dev_num);
638 return dev_num;
639 }
640 slave->dev_num = dev_num;
641 slave->dev_num_sticky = dev_num;
642 new_device = true;
643 } else {
644 slave->dev_num = slave->dev_num_sticky;
645 }
646 }
647
648 if (!new_device)
649 dev_dbg(slave->bus->dev,
650 "Slave already registered, reusing dev_num:%d\n",
651 slave->dev_num);
652
653
654 dev_num = slave->dev_num;
655 slave->dev_num = 0;
656
657 ret = sdw_write_no_pm(slave, SDW_SCP_DEVNUMBER, dev_num);
658 if (ret < 0) {
659 dev_err(&slave->dev, "Program device_num %d failed: %d\n",
660 dev_num, ret);
661 return ret;
662 }
663
664
665 slave->dev_num = slave->dev_num_sticky;
666
667 return 0;
668}
669
670void sdw_extract_slave_id(struct sdw_bus *bus,
671 u64 addr, struct sdw_slave_id *id)
672{
673 dev_dbg(bus->dev, "SDW Slave Addr: %llx\n", addr);
674
675 id->sdw_version = SDW_VERSION(addr);
676 id->unique_id = SDW_UNIQUE_ID(addr);
677 id->mfg_id = SDW_MFG_ID(addr);
678 id->part_id = SDW_PART_ID(addr);
679 id->class_id = SDW_CLASS_ID(addr);
680
681 dev_dbg(bus->dev,
682 "SDW Slave class_id %x, part_id %x, mfg_id %x, unique_id %x, version %x\n",
683 id->class_id, id->part_id, id->mfg_id,
684 id->unique_id, id->sdw_version);
685}
686
687static int sdw_program_device_num(struct sdw_bus *bus)
688{
689 u8 buf[SDW_NUM_DEV_ID_REGISTERS] = {0};
690 struct sdw_slave *slave, *_s;
691 struct sdw_slave_id id;
692 struct sdw_msg msg;
693 bool found = false;
694 int count = 0, ret;
695 u64 addr;
696
697
698 ret = sdw_fill_msg(&msg, NULL, SDW_SCP_DEVID_0,
699 SDW_NUM_DEV_ID_REGISTERS, 0, SDW_MSG_FLAG_READ, buf);
700 if (ret < 0)
701 return ret;
702
703 do {
704 ret = sdw_transfer(bus, &msg);
705 if (ret == -ENODATA) {
706 dev_dbg(bus->dev, "No more devices to enumerate\n");
707 ret = 0;
708 break;
709 }
710 if (ret < 0) {
711 dev_err(bus->dev, "DEVID read fail:%d\n", ret);
712 break;
713 }
714
715
716
717
718
719 addr = buf[5] | (buf[4] << 8) | (buf[3] << 16) |
720 ((u64)buf[2] << 24) | ((u64)buf[1] << 32) |
721 ((u64)buf[0] << 40);
722
723 sdw_extract_slave_id(bus, addr, &id);
724
725
726 list_for_each_entry_safe(slave, _s, &bus->slaves, node) {
727 if (sdw_compare_devid(slave, id) == 0) {
728 found = true;
729
730
731
732
733
734
735
736 ret = sdw_assign_device_num(slave);
737 if (ret) {
738 dev_err(slave->bus->dev,
739 "Assign dev_num failed:%d\n",
740 ret);
741 return ret;
742 }
743
744 break;
745 }
746 }
747
748 if (!found) {
749
750
751
752
753
754
755
756
757 sdw_slave_add(bus, &id, NULL);
758
759 dev_err(bus->dev, "Slave Entry not found\n");
760 }
761
762 count++;
763
764
765
766
767
768
769
770 } while (ret == 0 && count < (SDW_MAX_DEVICES * 2));
771
772 return ret;
773}
774
775static void sdw_modify_slave_status(struct sdw_slave *slave,
776 enum sdw_slave_status status)
777{
778 mutex_lock(&slave->bus->bus_lock);
779
780 dev_vdbg(&slave->dev,
781 "%s: changing status slave %d status %d new status %d\n",
782 __func__, slave->dev_num, slave->status, status);
783
784 if (status == SDW_SLAVE_UNATTACHED) {
785 dev_dbg(&slave->dev,
786 "%s: initializing completion for Slave %d\n",
787 __func__, slave->dev_num);
788
789 init_completion(&slave->enumeration_complete);
790 init_completion(&slave->initialization_complete);
791
792 } else if ((status == SDW_SLAVE_ATTACHED) &&
793 (slave->status == SDW_SLAVE_UNATTACHED)) {
794 dev_dbg(&slave->dev,
795 "%s: signaling completion for Slave %d\n",
796 __func__, slave->dev_num);
797
798 complete(&slave->enumeration_complete);
799 }
800 slave->status = status;
801 mutex_unlock(&slave->bus->bus_lock);
802}
803
804static enum sdw_clk_stop_mode sdw_get_clk_stop_mode(struct sdw_slave *slave)
805{
806 enum sdw_clk_stop_mode mode;
807
808
809
810
811
812 if (slave->ops && slave->ops->get_clk_stop_mode) {
813 mode = slave->ops->get_clk_stop_mode(slave);
814 } else {
815 if (slave->prop.clk_stop_mode1)
816 mode = SDW_CLK_STOP_MODE1;
817 else
818 mode = SDW_CLK_STOP_MODE0;
819 }
820
821 return mode;
822}
823
824static int sdw_slave_clk_stop_callback(struct sdw_slave *slave,
825 enum sdw_clk_stop_mode mode,
826 enum sdw_clk_stop_type type)
827{
828 int ret;
829
830 if (slave->ops && slave->ops->clk_stop) {
831 ret = slave->ops->clk_stop(slave, mode, type);
832 if (ret < 0) {
833 dev_err(&slave->dev,
834 "Clk Stop type =%d failed: %d\n", type, ret);
835 return ret;
836 }
837 }
838
839 return 0;
840}
841
842static int sdw_slave_clk_stop_prepare(struct sdw_slave *slave,
843 enum sdw_clk_stop_mode mode,
844 bool prepare)
845{
846 bool wake_en;
847 u32 val = 0;
848 int ret;
849
850 wake_en = slave->prop.wake_capable;
851
852 if (prepare) {
853 val = SDW_SCP_SYSTEMCTRL_CLK_STP_PREP;
854
855 if (mode == SDW_CLK_STOP_MODE1)
856 val |= SDW_SCP_SYSTEMCTRL_CLK_STP_MODE1;
857
858 if (wake_en)
859 val |= SDW_SCP_SYSTEMCTRL_WAKE_UP_EN;
860 } else {
861 val = sdw_read_no_pm(slave, SDW_SCP_SYSTEMCTRL);
862
863 val &= ~(SDW_SCP_SYSTEMCTRL_CLK_STP_PREP);
864 }
865
866 ret = sdw_write_no_pm(slave, SDW_SCP_SYSTEMCTRL, val);
867
868 if (ret != 0)
869 dev_err(&slave->dev,
870 "Clock Stop prepare failed for slave: %d", ret);
871
872 return ret;
873}
874
875static int sdw_bus_wait_for_clk_prep_deprep(struct sdw_bus *bus, u16 dev_num)
876{
877 int retry = bus->clk_stop_timeout;
878 int val;
879
880 do {
881 val = sdw_bread_no_pm(bus, dev_num, SDW_SCP_STAT) &
882 SDW_SCP_STAT_CLK_STP_NF;
883 if (!val) {
884 dev_info(bus->dev, "clock stop prep/de-prep done slave:%d",
885 dev_num);
886 return 0;
887 }
888
889 usleep_range(1000, 1500);
890 retry--;
891 } while (retry);
892
893 dev_err(bus->dev, "clock stop prep/de-prep failed slave:%d",
894 dev_num);
895
896 return -ETIMEDOUT;
897}
898
899
900
901
902
903
904
905
906int sdw_bus_prep_clk_stop(struct sdw_bus *bus)
907{
908 enum sdw_clk_stop_mode slave_mode;
909 bool simple_clk_stop = true;
910 struct sdw_slave *slave;
911 bool is_slave = false;
912 int ret = 0;
913
914
915
916
917
918
919 list_for_each_entry(slave, &bus->slaves, node) {
920 if (!slave->dev_num)
921 continue;
922
923 if (slave->status != SDW_SLAVE_ATTACHED &&
924 slave->status != SDW_SLAVE_ALERT)
925 continue;
926
927
928 is_slave = true;
929
930 slave_mode = sdw_get_clk_stop_mode(slave);
931 slave->curr_clk_stop_mode = slave_mode;
932
933 ret = sdw_slave_clk_stop_callback(slave, slave_mode,
934 SDW_CLK_PRE_PREPARE);
935 if (ret < 0) {
936 dev_err(&slave->dev,
937 "pre-prepare failed:%d", ret);
938 return ret;
939 }
940
941 ret = sdw_slave_clk_stop_prepare(slave,
942 slave_mode, true);
943 if (ret < 0) {
944 dev_err(&slave->dev,
945 "pre-prepare failed:%d", ret);
946 return ret;
947 }
948
949 if (slave_mode == SDW_CLK_STOP_MODE1)
950 simple_clk_stop = false;
951 }
952
953 if (is_slave && !simple_clk_stop) {
954 ret = sdw_bus_wait_for_clk_prep_deprep(bus,
955 SDW_BROADCAST_DEV_NUM);
956 if (ret < 0)
957 return ret;
958 }
959
960
961 if (!is_slave)
962 return ret;
963
964
965 list_for_each_entry(slave, &bus->slaves, node) {
966 if (!slave->dev_num)
967 continue;
968
969 if (slave->status != SDW_SLAVE_ATTACHED &&
970 slave->status != SDW_SLAVE_ALERT)
971 continue;
972
973 slave_mode = slave->curr_clk_stop_mode;
974
975 if (slave_mode == SDW_CLK_STOP_MODE1) {
976 ret = sdw_slave_clk_stop_callback(slave,
977 slave_mode,
978 SDW_CLK_POST_PREPARE);
979
980 if (ret < 0) {
981 dev_err(&slave->dev,
982 "post-prepare failed:%d", ret);
983 }
984 }
985 }
986
987 return ret;
988}
989EXPORT_SYMBOL(sdw_bus_prep_clk_stop);
990
991
992
993
994
995
996
997
998
999int sdw_bus_clk_stop(struct sdw_bus *bus)
1000{
1001 int ret;
1002
1003
1004
1005
1006
1007 ret = sdw_bwrite_no_pm(bus, SDW_BROADCAST_DEV_NUM,
1008 SDW_SCP_CTRL, SDW_SCP_CTRL_CLK_STP_NOW);
1009 if (ret < 0) {
1010 if (ret == -ENODATA)
1011 dev_dbg(bus->dev,
1012 "ClockStopNow Broadcast msg ignored %d", ret);
1013 else
1014 dev_err(bus->dev,
1015 "ClockStopNow Broadcast msg failed %d", ret);
1016 return ret;
1017 }
1018
1019 return 0;
1020}
1021EXPORT_SYMBOL(sdw_bus_clk_stop);
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032int sdw_bus_exit_clk_stop(struct sdw_bus *bus)
1033{
1034 enum sdw_clk_stop_mode mode;
1035 bool simple_clk_stop = true;
1036 struct sdw_slave *slave;
1037 bool is_slave = false;
1038 int ret;
1039
1040
1041
1042
1043
1044
1045 list_for_each_entry(slave, &bus->slaves, node) {
1046 if (!slave->dev_num)
1047 continue;
1048
1049 if (slave->status != SDW_SLAVE_ATTACHED &&
1050 slave->status != SDW_SLAVE_ALERT)
1051 continue;
1052
1053
1054 is_slave = true;
1055
1056 mode = slave->curr_clk_stop_mode;
1057
1058 if (mode == SDW_CLK_STOP_MODE1) {
1059 simple_clk_stop = false;
1060 continue;
1061 }
1062
1063 ret = sdw_slave_clk_stop_callback(slave, mode,
1064 SDW_CLK_PRE_DEPREPARE);
1065 if (ret < 0)
1066 dev_warn(&slave->dev,
1067 "clk stop deprep failed:%d", ret);
1068
1069 ret = sdw_slave_clk_stop_prepare(slave, mode,
1070 false);
1071
1072 if (ret < 0)
1073 dev_warn(&slave->dev,
1074 "clk stop deprep failed:%d", ret);
1075 }
1076
1077 if (is_slave && !simple_clk_stop)
1078 sdw_bus_wait_for_clk_prep_deprep(bus, SDW_BROADCAST_DEV_NUM);
1079
1080
1081
1082
1083
1084 if (!is_slave)
1085 return 0;
1086
1087 list_for_each_entry(slave, &bus->slaves, node) {
1088 if (!slave->dev_num)
1089 continue;
1090
1091 if (slave->status != SDW_SLAVE_ATTACHED &&
1092 slave->status != SDW_SLAVE_ALERT)
1093 continue;
1094
1095 mode = slave->curr_clk_stop_mode;
1096 sdw_slave_clk_stop_callback(slave, mode,
1097 SDW_CLK_POST_DEPREPARE);
1098 }
1099
1100 return 0;
1101}
1102EXPORT_SYMBOL(sdw_bus_exit_clk_stop);
1103
1104int sdw_configure_dpn_intr(struct sdw_slave *slave,
1105 int port, bool enable, int mask)
1106{
1107 u32 addr;
1108 int ret;
1109 u8 val = 0;
1110
1111 if (slave->bus->params.s_data_mode != SDW_PORT_DATA_MODE_NORMAL) {
1112 dev_dbg(&slave->dev, "TEST FAIL interrupt %s\n",
1113 enable ? "on" : "off");
1114 mask |= SDW_DPN_INT_TEST_FAIL;
1115 }
1116
1117 addr = SDW_DPN_INTMASK(port);
1118
1119
1120 if (enable) {
1121 val |= mask;
1122 val |= SDW_DPN_INT_PORT_READY;
1123 } else {
1124 val &= ~(mask);
1125 val &= ~SDW_DPN_INT_PORT_READY;
1126 }
1127
1128 ret = sdw_update(slave, addr, (mask | SDW_DPN_INT_PORT_READY), val);
1129 if (ret < 0)
1130 dev_err(slave->bus->dev,
1131 "SDW_DPN_INTMASK write failed:%d\n", val);
1132
1133 return ret;
1134}
1135
1136static int sdw_slave_set_frequency(struct sdw_slave *slave)
1137{
1138 u32 mclk_freq = slave->bus->prop.mclk_freq;
1139 u32 curr_freq = slave->bus->params.curr_dr_freq >> 1;
1140 unsigned int scale;
1141 u8 scale_index;
1142 u8 base;
1143 int ret;
1144
1145
1146
1147
1148
1149
1150 if (!slave->id.class_id)
1151 return 0;
1152
1153 if (!mclk_freq) {
1154 dev_err(&slave->dev,
1155 "no bus MCLK, cannot set SDW_SCP_BUS_CLOCK_BASE\n");
1156 return -EINVAL;
1157 }
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168 if (!(19200000 % mclk_freq)) {
1169 mclk_freq = 19200000;
1170 base = SDW_SCP_BASE_CLOCK_19200000_HZ;
1171 } else if (!(24000000 % mclk_freq)) {
1172 mclk_freq = 24000000;
1173 base = SDW_SCP_BASE_CLOCK_24000000_HZ;
1174 } else if (!(24576000 % mclk_freq)) {
1175 mclk_freq = 24576000;
1176 base = SDW_SCP_BASE_CLOCK_24576000_HZ;
1177 } else if (!(22579200 % mclk_freq)) {
1178 mclk_freq = 22579200;
1179 base = SDW_SCP_BASE_CLOCK_22579200_HZ;
1180 } else if (!(32000000 % mclk_freq)) {
1181 mclk_freq = 32000000;
1182 base = SDW_SCP_BASE_CLOCK_32000000_HZ;
1183 } else {
1184 dev_err(&slave->dev,
1185 "Unsupported clock base, mclk %d\n",
1186 mclk_freq);
1187 return -EINVAL;
1188 }
1189
1190 if (mclk_freq % curr_freq) {
1191 dev_err(&slave->dev,
1192 "mclk %d is not multiple of bus curr_freq %d\n",
1193 mclk_freq, curr_freq);
1194 return -EINVAL;
1195 }
1196
1197 scale = mclk_freq / curr_freq;
1198
1199
1200
1201
1202
1203 scale_index = ilog2(scale);
1204
1205 if (BIT(scale_index) != scale || scale_index > 6) {
1206 dev_err(&slave->dev,
1207 "No match found for scale %d, bus mclk %d curr_freq %d\n",
1208 scale, mclk_freq, curr_freq);
1209 return -EINVAL;
1210 }
1211 scale_index++;
1212
1213 ret = sdw_write(slave, SDW_SCP_BUS_CLOCK_BASE, base);
1214 if (ret < 0) {
1215 dev_err(&slave->dev,
1216 "SDW_SCP_BUS_CLOCK_BASE write failed:%d\n", ret);
1217 return ret;
1218 }
1219
1220
1221 ret = sdw_write(slave, SDW_SCP_BUSCLOCK_SCALE_B0, scale_index);
1222 if (ret < 0) {
1223 dev_err(&slave->dev,
1224 "SDW_SCP_BUSCLOCK_SCALE_B0 write failed:%d\n", ret);
1225 return ret;
1226 }
1227 ret = sdw_write(slave, SDW_SCP_BUSCLOCK_SCALE_B1, scale_index);
1228 if (ret < 0)
1229 dev_err(&slave->dev,
1230 "SDW_SCP_BUSCLOCK_SCALE_B1 write failed:%d\n", ret);
1231
1232 dev_dbg(&slave->dev,
1233 "Configured bus base %d, scale %d, mclk %d, curr_freq %d\n",
1234 base, scale_index, mclk_freq, curr_freq);
1235
1236 return ret;
1237}
1238
1239static int sdw_initialize_slave(struct sdw_slave *slave)
1240{
1241 struct sdw_slave_prop *prop = &slave->prop;
1242 int ret;
1243 u8 val;
1244
1245 ret = sdw_slave_set_frequency(slave);
1246 if (ret < 0)
1247 return ret;
1248
1249
1250
1251
1252
1253
1254
1255
1256 val = slave->prop.scp_int1_mask;
1257
1258
1259 ret = sdw_update(slave, SDW_SCP_INTMASK1, val, val);
1260 if (ret < 0) {
1261 dev_err(slave->bus->dev,
1262 "SDW_SCP_INTMASK1 write failed:%d\n", ret);
1263 return ret;
1264 }
1265
1266
1267 if (!slave->prop.dp0_prop)
1268 return 0;
1269
1270
1271 val = prop->dp0_prop->imp_def_interrupts;
1272 val |= SDW_DP0_INT_PORT_READY | SDW_DP0_INT_BRA_FAILURE;
1273
1274 ret = sdw_update(slave, SDW_DP0_INTMASK, val, val);
1275 if (ret < 0)
1276 dev_err(slave->bus->dev,
1277 "SDW_DP0_INTMASK read failed:%d\n", ret);
1278 return ret;
1279}
1280
1281static int sdw_handle_dp0_interrupt(struct sdw_slave *slave, u8 *slave_status)
1282{
1283 u8 clear = 0, impl_int_mask;
1284 int status, status2, ret, count = 0;
1285
1286 status = sdw_read(slave, SDW_DP0_INT);
1287 if (status < 0) {
1288 dev_err(slave->bus->dev,
1289 "SDW_DP0_INT read failed:%d\n", status);
1290 return status;
1291 }
1292
1293 do {
1294 if (status & SDW_DP0_INT_TEST_FAIL) {
1295 dev_err(&slave->dev, "Test fail for port 0\n");
1296 clear |= SDW_DP0_INT_TEST_FAIL;
1297 }
1298
1299
1300
1301
1302
1303
1304 if (status & SDW_DP0_INT_PORT_READY) {
1305 complete(&slave->port_ready[0]);
1306 clear |= SDW_DP0_INT_PORT_READY;
1307 }
1308
1309 if (status & SDW_DP0_INT_BRA_FAILURE) {
1310 dev_err(&slave->dev, "BRA failed\n");
1311 clear |= SDW_DP0_INT_BRA_FAILURE;
1312 }
1313
1314 impl_int_mask = SDW_DP0_INT_IMPDEF1 |
1315 SDW_DP0_INT_IMPDEF2 | SDW_DP0_INT_IMPDEF3;
1316
1317 if (status & impl_int_mask) {
1318 clear |= impl_int_mask;
1319 *slave_status = clear;
1320 }
1321
1322
1323 ret = sdw_write(slave, SDW_DP0_INT, clear);
1324 if (ret < 0) {
1325 dev_err(slave->bus->dev,
1326 "SDW_DP0_INT write failed:%d\n", ret);
1327 return ret;
1328 }
1329
1330
1331 status2 = sdw_read(slave, SDW_DP0_INT);
1332 if (status2 < 0) {
1333 dev_err(slave->bus->dev,
1334 "SDW_DP0_INT read failed:%d\n", status2);
1335 return status2;
1336 }
1337 status &= status2;
1338
1339 count++;
1340
1341
1342 } while (status != 0 && count < SDW_READ_INTR_CLEAR_RETRY);
1343
1344 if (count == SDW_READ_INTR_CLEAR_RETRY)
1345 dev_warn(slave->bus->dev, "Reached MAX_RETRY on DP0 read\n");
1346
1347 return ret;
1348}
1349
1350static int sdw_handle_port_interrupt(struct sdw_slave *slave,
1351 int port, u8 *slave_status)
1352{
1353 u8 clear = 0, impl_int_mask;
1354 int status, status2, ret, count = 0;
1355 u32 addr;
1356
1357 if (port == 0)
1358 return sdw_handle_dp0_interrupt(slave, slave_status);
1359
1360 addr = SDW_DPN_INT(port);
1361 status = sdw_read(slave, addr);
1362 if (status < 0) {
1363 dev_err(slave->bus->dev,
1364 "SDW_DPN_INT read failed:%d\n", status);
1365
1366 return status;
1367 }
1368
1369 do {
1370 if (status & SDW_DPN_INT_TEST_FAIL) {
1371 dev_err(&slave->dev, "Test fail for port:%d\n", port);
1372 clear |= SDW_DPN_INT_TEST_FAIL;
1373 }
1374
1375
1376
1377
1378
1379 if (status & SDW_DPN_INT_PORT_READY) {
1380 complete(&slave->port_ready[port]);
1381 clear |= SDW_DPN_INT_PORT_READY;
1382 }
1383
1384 impl_int_mask = SDW_DPN_INT_IMPDEF1 |
1385 SDW_DPN_INT_IMPDEF2 | SDW_DPN_INT_IMPDEF3;
1386
1387 if (status & impl_int_mask) {
1388 clear |= impl_int_mask;
1389 *slave_status = clear;
1390 }
1391
1392
1393 ret = sdw_write(slave, addr, clear);
1394 if (ret < 0) {
1395 dev_err(slave->bus->dev,
1396 "SDW_DPN_INT write failed:%d\n", ret);
1397 return ret;
1398 }
1399
1400
1401 status2 = sdw_read(slave, addr);
1402 if (status2 < 0) {
1403 dev_err(slave->bus->dev,
1404 "SDW_DPN_INT read failed:%d\n", status2);
1405 return status2;
1406 }
1407 status &= status2;
1408
1409 count++;
1410
1411
1412 } while (status != 0 && count < SDW_READ_INTR_CLEAR_RETRY);
1413
1414 if (count == SDW_READ_INTR_CLEAR_RETRY)
1415 dev_warn(slave->bus->dev, "Reached MAX_RETRY on port read");
1416
1417 return ret;
1418}
1419
1420static int sdw_handle_slave_alerts(struct sdw_slave *slave)
1421{
1422 struct sdw_slave_intr_status slave_intr;
1423 u8 clear = 0, bit, port_status[15] = {0};
1424 int port_num, stat, ret, count = 0;
1425 unsigned long port;
1426 bool slave_notify = false;
1427 u8 buf, buf2[2], _buf, _buf2[2];
1428 bool parity_check;
1429 bool parity_quirk;
1430
1431 sdw_modify_slave_status(slave, SDW_SLAVE_ALERT);
1432
1433 ret = pm_runtime_get_sync(&slave->dev);
1434 if (ret < 0 && ret != -EACCES) {
1435 dev_err(&slave->dev, "Failed to resume device: %d\n", ret);
1436 pm_runtime_put_noidle(slave->bus->dev);
1437 return ret;
1438 }
1439
1440
1441 ret = sdw_read(slave, SDW_SCP_INT1);
1442 if (ret < 0) {
1443 dev_err(slave->bus->dev,
1444 "SDW_SCP_INT1 read failed:%d\n", ret);
1445 goto io_err;
1446 }
1447 buf = ret;
1448
1449 ret = sdw_nread(slave, SDW_SCP_INTSTAT2, 2, buf2);
1450 if (ret < 0) {
1451 dev_err(slave->bus->dev,
1452 "SDW_SCP_INT2/3 read failed:%d\n", ret);
1453 goto io_err;
1454 }
1455
1456 do {
1457
1458
1459
1460
1461 if (buf & SDW_SCP_INT1_PARITY) {
1462 parity_check = slave->prop.scp_int1_mask & SDW_SCP_INT1_PARITY;
1463 parity_quirk = !slave->first_interrupt_done &&
1464 (slave->prop.quirks & SDW_SLAVE_QUIRKS_INVALID_INITIAL_PARITY);
1465
1466 if (parity_check && !parity_quirk)
1467 dev_err(&slave->dev, "Parity error detected\n");
1468 clear |= SDW_SCP_INT1_PARITY;
1469 }
1470
1471 if (buf & SDW_SCP_INT1_BUS_CLASH) {
1472 if (slave->prop.scp_int1_mask & SDW_SCP_INT1_BUS_CLASH)
1473 dev_err(&slave->dev, "Bus clash detected\n");
1474 clear |= SDW_SCP_INT1_BUS_CLASH;
1475 }
1476
1477
1478
1479
1480
1481
1482
1483
1484 if (buf & SDW_SCP_INT1_IMPL_DEF) {
1485 if (slave->prop.scp_int1_mask & SDW_SCP_INT1_IMPL_DEF) {
1486 dev_dbg(&slave->dev, "Slave impl defined interrupt\n");
1487 slave_notify = true;
1488 }
1489 clear |= SDW_SCP_INT1_IMPL_DEF;
1490 }
1491
1492
1493 port = buf & SDW_SCP_INT1_PORT0_3;
1494
1495
1496 port = FIELD_GET(SDW_SCP_INT1_PORT0_3, port);
1497 for_each_set_bit(bit, &port, 8) {
1498 sdw_handle_port_interrupt(slave, bit,
1499 &port_status[bit]);
1500 }
1501
1502
1503 if (buf & SDW_SCP_INT1_SCP2_CASCADE) {
1504 port = buf2[0] & SDW_SCP_INTSTAT2_PORT4_10;
1505 for_each_set_bit(bit, &port, 8) {
1506
1507 port_num = bit + 3;
1508 sdw_handle_port_interrupt(slave,
1509 port_num,
1510 &port_status[port_num]);
1511 }
1512 }
1513
1514
1515 if (buf2[0] & SDW_SCP_INTSTAT2_SCP3_CASCADE) {
1516 port = buf2[1] & SDW_SCP_INTSTAT3_PORT11_14;
1517 for_each_set_bit(bit, &port, 8) {
1518
1519 port_num = bit + 10;
1520 sdw_handle_port_interrupt(slave,
1521 port_num,
1522 &port_status[port_num]);
1523 }
1524 }
1525
1526
1527 if (slave_notify && slave->ops &&
1528 slave->ops->interrupt_callback) {
1529 slave_intr.control_port = clear;
1530 memcpy(slave_intr.port, &port_status,
1531 sizeof(slave_intr.port));
1532
1533 slave->ops->interrupt_callback(slave, &slave_intr);
1534 }
1535
1536
1537 ret = sdw_write(slave, SDW_SCP_INT1, clear);
1538 if (ret < 0) {
1539 dev_err(slave->bus->dev,
1540 "SDW_SCP_INT1 write failed:%d\n", ret);
1541 goto io_err;
1542 }
1543
1544
1545 slave->first_interrupt_done = true;
1546
1547
1548
1549
1550
1551 ret = sdw_read(slave, SDW_SCP_INT1);
1552 if (ret < 0) {
1553 dev_err(slave->bus->dev,
1554 "SDW_SCP_INT1 read failed:%d\n", ret);
1555 goto io_err;
1556 }
1557 _buf = ret;
1558
1559 ret = sdw_nread(slave, SDW_SCP_INTSTAT2, 2, _buf2);
1560 if (ret < 0) {
1561 dev_err(slave->bus->dev,
1562 "SDW_SCP_INT2/3 read failed:%d\n", ret);
1563 goto io_err;
1564 }
1565
1566
1567 buf &= _buf;
1568 buf2[0] &= _buf2[0];
1569 buf2[1] &= _buf2[1];
1570 stat = buf || buf2[0] || buf2[1];
1571
1572
1573
1574
1575
1576 count++;
1577
1578
1579 } while (stat != 0 && count < SDW_READ_INTR_CLEAR_RETRY);
1580
1581 if (count == SDW_READ_INTR_CLEAR_RETRY)
1582 dev_warn(slave->bus->dev, "Reached MAX_RETRY on alert read\n");
1583
1584io_err:
1585 pm_runtime_mark_last_busy(&slave->dev);
1586 pm_runtime_put_autosuspend(&slave->dev);
1587
1588 return ret;
1589}
1590
1591static int sdw_update_slave_status(struct sdw_slave *slave,
1592 enum sdw_slave_status status)
1593{
1594 unsigned long time;
1595
1596 if (!slave->probed) {
1597
1598
1599
1600
1601
1602
1603
1604
1605 time = wait_for_completion_timeout(&slave->probe_complete,
1606 msecs_to_jiffies(DEFAULT_PROBE_TIMEOUT));
1607 if (!time) {
1608 dev_err(&slave->dev, "Probe not complete, timed out\n");
1609 return -ETIMEDOUT;
1610 }
1611 }
1612
1613 if (!slave->ops || !slave->ops->update_status)
1614 return 0;
1615
1616 return slave->ops->update_status(slave, status);
1617}
1618
1619
1620
1621
1622
1623
1624int sdw_handle_slave_status(struct sdw_bus *bus,
1625 enum sdw_slave_status status[])
1626{
1627 enum sdw_slave_status prev_status;
1628 struct sdw_slave *slave;
1629 bool attached_initializing;
1630 int i, ret = 0;
1631
1632
1633 for (i = 1; i <= SDW_MAX_DEVICES; i++) {
1634 mutex_lock(&bus->bus_lock);
1635 if (test_bit(i, bus->assigned) == false) {
1636 mutex_unlock(&bus->bus_lock);
1637 continue;
1638 }
1639 mutex_unlock(&bus->bus_lock);
1640
1641 slave = sdw_get_slave(bus, i);
1642 if (!slave)
1643 continue;
1644
1645 if (status[i] == SDW_SLAVE_UNATTACHED &&
1646 slave->status != SDW_SLAVE_UNATTACHED)
1647 sdw_modify_slave_status(slave, SDW_SLAVE_UNATTACHED);
1648 }
1649
1650 if (status[0] == SDW_SLAVE_ATTACHED) {
1651 dev_dbg(bus->dev, "Slave attached, programming device number\n");
1652 ret = sdw_program_device_num(bus);
1653 if (ret)
1654 dev_err(bus->dev, "Slave attach failed: %d\n", ret);
1655
1656
1657
1658
1659 return ret;
1660 }
1661
1662
1663 for (i = 1; i <= SDW_MAX_DEVICES; i++) {
1664 mutex_lock(&bus->bus_lock);
1665 if (test_bit(i, bus->assigned) == false) {
1666 mutex_unlock(&bus->bus_lock);
1667 continue;
1668 }
1669 mutex_unlock(&bus->bus_lock);
1670
1671 slave = sdw_get_slave(bus, i);
1672 if (!slave)
1673 continue;
1674
1675 attached_initializing = false;
1676
1677 switch (status[i]) {
1678 case SDW_SLAVE_UNATTACHED:
1679 if (slave->status == SDW_SLAVE_UNATTACHED)
1680 break;
1681
1682 sdw_modify_slave_status(slave, SDW_SLAVE_UNATTACHED);
1683 break;
1684
1685 case SDW_SLAVE_ALERT:
1686 ret = sdw_handle_slave_alerts(slave);
1687 if (ret)
1688 dev_err(bus->dev,
1689 "Slave %d alert handling failed: %d\n",
1690 i, ret);
1691 break;
1692
1693 case SDW_SLAVE_ATTACHED:
1694 if (slave->status == SDW_SLAVE_ATTACHED)
1695 break;
1696
1697 prev_status = slave->status;
1698 sdw_modify_slave_status(slave, SDW_SLAVE_ATTACHED);
1699
1700 if (prev_status == SDW_SLAVE_ALERT)
1701 break;
1702
1703 attached_initializing = true;
1704
1705 ret = sdw_initialize_slave(slave);
1706 if (ret)
1707 dev_err(bus->dev,
1708 "Slave %d initialization failed: %d\n",
1709 i, ret);
1710
1711 break;
1712
1713 default:
1714 dev_err(bus->dev, "Invalid slave %d status:%d\n",
1715 i, status[i]);
1716 break;
1717 }
1718
1719 ret = sdw_update_slave_status(slave, status[i]);
1720 if (ret)
1721 dev_err(slave->bus->dev,
1722 "Update Slave status failed:%d\n", ret);
1723 if (attached_initializing)
1724 complete(&slave->initialization_complete);
1725 }
1726
1727 return ret;
1728}
1729EXPORT_SYMBOL(sdw_handle_slave_status);
1730
1731void sdw_clear_slave_status(struct sdw_bus *bus, u32 request)
1732{
1733 struct sdw_slave *slave;
1734 int i;
1735
1736
1737 for (i = 1; i <= SDW_MAX_DEVICES; i++) {
1738 mutex_lock(&bus->bus_lock);
1739 if (test_bit(i, bus->assigned) == false) {
1740 mutex_unlock(&bus->bus_lock);
1741 continue;
1742 }
1743 mutex_unlock(&bus->bus_lock);
1744
1745 slave = sdw_get_slave(bus, i);
1746 if (!slave)
1747 continue;
1748
1749 if (slave->status != SDW_SLAVE_UNATTACHED) {
1750 sdw_modify_slave_status(slave, SDW_SLAVE_UNATTACHED);
1751 slave->first_interrupt_done = false;
1752 }
1753
1754
1755 slave->unattach_request = request;
1756 }
1757}
1758EXPORT_SYMBOL(sdw_clear_slave_status);
1759