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