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 < 0) {
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 < 0) {
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 < 0) {
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 %s addr %x count %d\n",
271 msg->dev_num, ret,
272 (msg->flags & SDW_MSG_FLAG_WRITE) ? "write" : "read",
273 msg->addr, msg->len);
274
275 if (msg->page)
276 sdw_reset_page(bus, msg->dev_num);
277
278 return ret;
279}
280
281
282
283
284
285
286int sdw_transfer(struct sdw_bus *bus, struct sdw_msg *msg)
287{
288 int ret;
289
290 mutex_lock(&bus->msg_lock);
291
292 ret = sdw_transfer_unlocked(bus, msg);
293
294 mutex_unlock(&bus->msg_lock);
295
296 return ret;
297}
298
299
300
301
302
303
304
305
306
307int sdw_transfer_defer(struct sdw_bus *bus, struct sdw_msg *msg,
308 struct sdw_defer *defer)
309{
310 int ret;
311
312 if (!bus->ops->xfer_msg_defer)
313 return -ENOTSUPP;
314
315 ret = do_transfer_defer(bus, msg, defer);
316 if (ret != 0 && ret != -ENODATA)
317 dev_err(bus->dev, "Defer trf on Slave %d failed:%d\n",
318 msg->dev_num, ret);
319
320 if (msg->page)
321 sdw_reset_page(bus, msg->dev_num);
322
323 return ret;
324}
325
326int sdw_fill_msg(struct sdw_msg *msg, struct sdw_slave *slave,
327 u32 addr, size_t count, u16 dev_num, u8 flags, u8 *buf)
328{
329 memset(msg, 0, sizeof(*msg));
330 msg->addr = addr;
331 msg->len = count;
332 msg->dev_num = dev_num;
333 msg->flags = flags;
334 msg->buf = buf;
335
336 if (addr < SDW_REG_NO_PAGE)
337 return 0;
338
339 if (addr >= SDW_REG_MAX) {
340 pr_err("SDW: Invalid address %x passed\n", addr);
341 return -EINVAL;
342 }
343
344 if (addr < SDW_REG_OPTIONAL_PAGE) {
345 if (slave && !slave->prop.paging_support)
346 return 0;
347
348 }
349
350
351 if (dev_num == SDW_ENUM_DEV_NUM || dev_num == SDW_BROADCAST_DEV_NUM) {
352 pr_err("SDW: Invalid device for paging :%d\n", dev_num);
353 return -EINVAL;
354 }
355
356 if (!slave) {
357 pr_err("SDW: No slave for paging addr\n");
358 return -EINVAL;
359 }
360
361 if (!slave->prop.paging_support) {
362 dev_err(&slave->dev,
363 "address %x needs paging but no support\n", addr);
364 return -EINVAL;
365 }
366
367 msg->addr_page1 = FIELD_GET(SDW_SCP_ADDRPAGE1_MASK, addr);
368 msg->addr_page2 = FIELD_GET(SDW_SCP_ADDRPAGE2_MASK, addr);
369 msg->addr |= BIT(15);
370 msg->page = true;
371
372 return 0;
373}
374
375
376
377
378
379
380
381
382static int
383sdw_nread_no_pm(struct sdw_slave *slave, u32 addr, size_t count, u8 *val)
384{
385 struct sdw_msg msg;
386 int ret;
387
388 ret = sdw_fill_msg(&msg, slave, addr, count,
389 slave->dev_num, SDW_MSG_FLAG_READ, val);
390 if (ret < 0)
391 return ret;
392
393 ret = sdw_transfer(slave->bus, &msg);
394 if (slave->is_mockup_device)
395 ret = 0;
396 return ret;
397}
398
399static int
400sdw_nwrite_no_pm(struct sdw_slave *slave, u32 addr, size_t count, const u8 *val)
401{
402 struct sdw_msg msg;
403 int ret;
404
405 ret = sdw_fill_msg(&msg, slave, addr, count,
406 slave->dev_num, SDW_MSG_FLAG_WRITE, (u8 *)val);
407 if (ret < 0)
408 return ret;
409
410 ret = sdw_transfer(slave->bus, &msg);
411 if (slave->is_mockup_device)
412 ret = 0;
413 return ret;
414}
415
416int sdw_write_no_pm(struct sdw_slave *slave, u32 addr, u8 value)
417{
418 return sdw_nwrite_no_pm(slave, addr, 1, &value);
419}
420EXPORT_SYMBOL(sdw_write_no_pm);
421
422static int
423sdw_bread_no_pm(struct sdw_bus *bus, u16 dev_num, u32 addr)
424{
425 struct sdw_msg msg;
426 u8 buf;
427 int ret;
428
429 ret = sdw_fill_msg(&msg, NULL, addr, 1, dev_num,
430 SDW_MSG_FLAG_READ, &buf);
431 if (ret < 0)
432 return ret;
433
434 ret = sdw_transfer(bus, &msg);
435 if (ret < 0)
436 return ret;
437
438 return buf;
439}
440
441static int
442sdw_bwrite_no_pm(struct sdw_bus *bus, u16 dev_num, u32 addr, u8 value)
443{
444 struct sdw_msg msg;
445 int ret;
446
447 ret = sdw_fill_msg(&msg, NULL, addr, 1, dev_num,
448 SDW_MSG_FLAG_WRITE, &value);
449 if (ret < 0)
450 return ret;
451
452 return sdw_transfer(bus, &msg);
453}
454
455int sdw_bread_no_pm_unlocked(struct sdw_bus *bus, u16 dev_num, u32 addr)
456{
457 struct sdw_msg msg;
458 u8 buf;
459 int ret;
460
461 ret = sdw_fill_msg(&msg, NULL, addr, 1, dev_num,
462 SDW_MSG_FLAG_READ, &buf);
463 if (ret < 0)
464 return ret;
465
466 ret = sdw_transfer_unlocked(bus, &msg);
467 if (ret < 0)
468 return ret;
469
470 return buf;
471}
472EXPORT_SYMBOL(sdw_bread_no_pm_unlocked);
473
474int sdw_bwrite_no_pm_unlocked(struct sdw_bus *bus, u16 dev_num, u32 addr, u8 value)
475{
476 struct sdw_msg msg;
477 int ret;
478
479 ret = sdw_fill_msg(&msg, NULL, addr, 1, dev_num,
480 SDW_MSG_FLAG_WRITE, &value);
481 if (ret < 0)
482 return ret;
483
484 return sdw_transfer_unlocked(bus, &msg);
485}
486EXPORT_SYMBOL(sdw_bwrite_no_pm_unlocked);
487
488int sdw_read_no_pm(struct sdw_slave *slave, u32 addr)
489{
490 u8 buf;
491 int ret;
492
493 ret = sdw_nread_no_pm(slave, addr, 1, &buf);
494 if (ret < 0)
495 return ret;
496 else
497 return buf;
498}
499EXPORT_SYMBOL(sdw_read_no_pm);
500
501int sdw_update_no_pm(struct sdw_slave *slave, u32 addr, u8 mask, u8 val)
502{
503 int tmp;
504
505 tmp = sdw_read_no_pm(slave, addr);
506 if (tmp < 0)
507 return tmp;
508
509 tmp = (tmp & ~mask) | val;
510 return sdw_write_no_pm(slave, addr, tmp);
511}
512EXPORT_SYMBOL(sdw_update_no_pm);
513
514
515int sdw_update(struct sdw_slave *slave, u32 addr, u8 mask, u8 val)
516{
517 int tmp;
518
519 tmp = sdw_read(slave, addr);
520 if (tmp < 0)
521 return tmp;
522
523 tmp = (tmp & ~mask) | val;
524 return sdw_write(slave, addr, tmp);
525}
526EXPORT_SYMBOL(sdw_update);
527
528
529
530
531
532
533
534
535int sdw_nread(struct sdw_slave *slave, u32 addr, size_t count, u8 *val)
536{
537 int ret;
538
539 ret = pm_runtime_get_sync(&slave->dev);
540 if (ret < 0 && ret != -EACCES) {
541 pm_runtime_put_noidle(&slave->dev);
542 return ret;
543 }
544
545 ret = sdw_nread_no_pm(slave, addr, count, val);
546
547 pm_runtime_mark_last_busy(&slave->dev);
548 pm_runtime_put(&slave->dev);
549
550 return ret;
551}
552EXPORT_SYMBOL(sdw_nread);
553
554
555
556
557
558
559
560
561int sdw_nwrite(struct sdw_slave *slave, u32 addr, size_t count, const u8 *val)
562{
563 int ret;
564
565 ret = pm_runtime_get_sync(&slave->dev);
566 if (ret < 0 && ret != -EACCES) {
567 pm_runtime_put_noidle(&slave->dev);
568 return ret;
569 }
570
571 ret = sdw_nwrite_no_pm(slave, addr, count, val);
572
573 pm_runtime_mark_last_busy(&slave->dev);
574 pm_runtime_put(&slave->dev);
575
576 return ret;
577}
578EXPORT_SYMBOL(sdw_nwrite);
579
580
581
582
583
584
585int sdw_read(struct sdw_slave *slave, u32 addr)
586{
587 u8 buf;
588 int ret;
589
590 ret = sdw_nread(slave, addr, 1, &buf);
591 if (ret < 0)
592 return ret;
593
594 return buf;
595}
596EXPORT_SYMBOL(sdw_read);
597
598
599
600
601
602
603
604int sdw_write(struct sdw_slave *slave, u32 addr, u8 value)
605{
606 return sdw_nwrite(slave, addr, 1, &value);
607}
608EXPORT_SYMBOL(sdw_write);
609
610
611
612
613
614
615static struct sdw_slave *sdw_get_slave(struct sdw_bus *bus, int i)
616{
617 struct sdw_slave *slave;
618
619 list_for_each_entry(slave, &bus->slaves, node) {
620 if (slave->dev_num == i)
621 return slave;
622 }
623
624 return NULL;
625}
626
627int sdw_compare_devid(struct sdw_slave *slave, struct sdw_slave_id id)
628{
629 if (slave->id.mfg_id != id.mfg_id ||
630 slave->id.part_id != id.part_id ||
631 slave->id.class_id != id.class_id ||
632 (slave->id.unique_id != SDW_IGNORED_UNIQUE_ID &&
633 slave->id.unique_id != id.unique_id))
634 return -ENODEV;
635
636 return 0;
637}
638EXPORT_SYMBOL(sdw_compare_devid);
639
640
641static int sdw_get_device_num(struct sdw_slave *slave)
642{
643 int bit;
644
645 bit = find_first_zero_bit(slave->bus->assigned, SDW_MAX_DEVICES);
646 if (bit == SDW_MAX_DEVICES) {
647 bit = -ENODEV;
648 goto err;
649 }
650
651
652
653
654
655 set_bit(bit, slave->bus->assigned);
656
657err:
658 return bit;
659}
660
661static int sdw_assign_device_num(struct sdw_slave *slave)
662{
663 struct sdw_bus *bus = slave->bus;
664 int ret, dev_num;
665 bool new_device = false;
666
667
668 if (!slave->dev_num) {
669 if (!slave->dev_num_sticky) {
670 mutex_lock(&slave->bus->bus_lock);
671 dev_num = sdw_get_device_num(slave);
672 mutex_unlock(&slave->bus->bus_lock);
673 if (dev_num < 0) {
674 dev_err(bus->dev, "Get dev_num failed: %d\n",
675 dev_num);
676 return dev_num;
677 }
678 slave->dev_num = dev_num;
679 slave->dev_num_sticky = dev_num;
680 new_device = true;
681 } else {
682 slave->dev_num = slave->dev_num_sticky;
683 }
684 }
685
686 if (!new_device)
687 dev_dbg(bus->dev,
688 "Slave already registered, reusing dev_num:%d\n",
689 slave->dev_num);
690
691
692 dev_num = slave->dev_num;
693 slave->dev_num = 0;
694
695 ret = sdw_write_no_pm(slave, SDW_SCP_DEVNUMBER, dev_num);
696 if (ret < 0) {
697 dev_err(bus->dev, "Program device_num %d failed: %d\n",
698 dev_num, ret);
699 return ret;
700 }
701
702
703 slave->dev_num = slave->dev_num_sticky;
704
705 return 0;
706}
707
708void sdw_extract_slave_id(struct sdw_bus *bus,
709 u64 addr, struct sdw_slave_id *id)
710{
711 dev_dbg(bus->dev, "SDW Slave Addr: %llx\n", addr);
712
713 id->sdw_version = SDW_VERSION(addr);
714 id->unique_id = SDW_UNIQUE_ID(addr);
715 id->mfg_id = SDW_MFG_ID(addr);
716 id->part_id = SDW_PART_ID(addr);
717 id->class_id = SDW_CLASS_ID(addr);
718
719 dev_dbg(bus->dev,
720 "SDW Slave class_id 0x%02x, mfg_id 0x%04x, part_id 0x%04x, unique_id 0x%x, version 0x%x\n",
721 id->class_id, id->mfg_id, id->part_id, id->unique_id, id->sdw_version);
722}
723EXPORT_SYMBOL(sdw_extract_slave_id);
724
725static int sdw_program_device_num(struct sdw_bus *bus)
726{
727 u8 buf[SDW_NUM_DEV_ID_REGISTERS] = {0};
728 struct sdw_slave *slave, *_s;
729 struct sdw_slave_id id;
730 struct sdw_msg msg;
731 bool found;
732 int count = 0, ret;
733 u64 addr;
734
735
736 ret = sdw_fill_msg(&msg, NULL, SDW_SCP_DEVID_0,
737 SDW_NUM_DEV_ID_REGISTERS, 0, SDW_MSG_FLAG_READ, buf);
738 if (ret < 0)
739 return ret;
740
741 do {
742 ret = sdw_transfer(bus, &msg);
743 if (ret == -ENODATA) {
744 dev_dbg(bus->dev, "No more devices to enumerate\n");
745 ret = 0;
746 break;
747 }
748 if (ret < 0) {
749 dev_err(bus->dev, "DEVID read fail:%d\n", ret);
750 break;
751 }
752
753
754
755
756
757 addr = buf[5] | (buf[4] << 8) | (buf[3] << 16) |
758 ((u64)buf[2] << 24) | ((u64)buf[1] << 32) |
759 ((u64)buf[0] << 40);
760
761 sdw_extract_slave_id(bus, addr, &id);
762
763 found = false;
764
765 list_for_each_entry_safe(slave, _s, &bus->slaves, node) {
766 if (sdw_compare_devid(slave, id) == 0) {
767 found = true;
768
769
770
771
772
773
774
775 ret = sdw_assign_device_num(slave);
776 if (ret < 0) {
777 dev_err(bus->dev,
778 "Assign dev_num failed:%d\n",
779 ret);
780 return ret;
781 }
782
783 break;
784 }
785 }
786
787 if (!found) {
788
789
790
791
792
793
794
795
796 sdw_slave_add(bus, &id, NULL);
797
798 dev_err(bus->dev, "Slave Entry not found\n");
799 }
800
801 count++;
802
803
804
805
806
807
808
809 } while (ret == 0 && count < (SDW_MAX_DEVICES * 2));
810
811 return ret;
812}
813
814static void sdw_modify_slave_status(struct sdw_slave *slave,
815 enum sdw_slave_status status)
816{
817 struct sdw_bus *bus = slave->bus;
818
819 mutex_lock(&bus->bus_lock);
820
821 dev_vdbg(bus->dev,
822 "%s: changing status slave %d status %d new status %d\n",
823 __func__, slave->dev_num, slave->status, status);
824
825 if (status == SDW_SLAVE_UNATTACHED) {
826 dev_dbg(&slave->dev,
827 "%s: initializing enumeration and init completion for Slave %d\n",
828 __func__, slave->dev_num);
829
830 init_completion(&slave->enumeration_complete);
831 init_completion(&slave->initialization_complete);
832
833 } else if ((status == SDW_SLAVE_ATTACHED) &&
834 (slave->status == SDW_SLAVE_UNATTACHED)) {
835 dev_dbg(&slave->dev,
836 "%s: signaling enumeration completion for Slave %d\n",
837 __func__, slave->dev_num);
838
839 complete(&slave->enumeration_complete);
840 }
841 slave->status = status;
842 mutex_unlock(&bus->bus_lock);
843}
844
845static int sdw_slave_clk_stop_callback(struct sdw_slave *slave,
846 enum sdw_clk_stop_mode mode,
847 enum sdw_clk_stop_type type)
848{
849 int ret;
850
851 if (slave->ops && slave->ops->clk_stop) {
852 ret = slave->ops->clk_stop(slave, mode, type);
853 if (ret < 0)
854 return ret;
855 }
856
857 return 0;
858}
859
860static int sdw_slave_clk_stop_prepare(struct sdw_slave *slave,
861 enum sdw_clk_stop_mode mode,
862 bool prepare)
863{
864 bool wake_en;
865 u32 val = 0;
866 int ret;
867
868 wake_en = slave->prop.wake_capable;
869
870 if (prepare) {
871 val = SDW_SCP_SYSTEMCTRL_CLK_STP_PREP;
872
873 if (mode == SDW_CLK_STOP_MODE1)
874 val |= SDW_SCP_SYSTEMCTRL_CLK_STP_MODE1;
875
876 if (wake_en)
877 val |= SDW_SCP_SYSTEMCTRL_WAKE_UP_EN;
878 } else {
879 ret = sdw_read_no_pm(slave, SDW_SCP_SYSTEMCTRL);
880 if (ret < 0) {
881 if (ret != -ENODATA)
882 dev_err(&slave->dev, "SDW_SCP_SYSTEMCTRL read failed:%d\n", ret);
883 return ret;
884 }
885 val = ret;
886 val &= ~(SDW_SCP_SYSTEMCTRL_CLK_STP_PREP);
887 }
888
889 ret = sdw_write_no_pm(slave, SDW_SCP_SYSTEMCTRL, val);
890
891 if (ret < 0 && ret != -ENODATA)
892 dev_err(&slave->dev, "SDW_SCP_SYSTEMCTRL write failed:%d\n", ret);
893
894 return ret;
895}
896
897static int sdw_bus_wait_for_clk_prep_deprep(struct sdw_bus *bus, u16 dev_num)
898{
899 int retry = bus->clk_stop_timeout;
900 int val;
901
902 do {
903 val = sdw_bread_no_pm(bus, dev_num, SDW_SCP_STAT);
904 if (val < 0) {
905 if (val != -ENODATA)
906 dev_err(bus->dev, "SDW_SCP_STAT bread failed:%d\n", val);
907 return val;
908 }
909 val &= SDW_SCP_STAT_CLK_STP_NF;
910 if (!val) {
911 dev_dbg(bus->dev, "clock stop prep/de-prep done slave:%d\n",
912 dev_num);
913 return 0;
914 }
915
916 usleep_range(1000, 1500);
917 retry--;
918 } while (retry);
919
920 dev_err(bus->dev, "clock stop prep/de-prep failed slave:%d\n",
921 dev_num);
922
923 return -ETIMEDOUT;
924}
925
926
927
928
929
930
931
932
933int sdw_bus_prep_clk_stop(struct sdw_bus *bus)
934{
935 bool simple_clk_stop = true;
936 struct sdw_slave *slave;
937 bool is_slave = false;
938 int ret = 0;
939
940
941
942
943
944
945
946
947
948 list_for_each_entry(slave, &bus->slaves, node) {
949 if (!slave->dev_num)
950 continue;
951
952 if (slave->status != SDW_SLAVE_ATTACHED &&
953 slave->status != SDW_SLAVE_ALERT)
954 continue;
955
956
957 is_slave = true;
958
959 ret = sdw_slave_clk_stop_callback(slave,
960 SDW_CLK_STOP_MODE0,
961 SDW_CLK_PRE_PREPARE);
962 if (ret < 0 && ret != -ENODATA) {
963 dev_err(&slave->dev, "clock stop pre-prepare cb failed:%d\n", ret);
964 return ret;
965 }
966
967
968 if (!slave->prop.simple_clk_stop_capable) {
969 simple_clk_stop = false;
970
971 ret = sdw_slave_clk_stop_prepare(slave,
972 SDW_CLK_STOP_MODE0,
973 true);
974 if (ret < 0 && ret != -ENODATA) {
975 dev_err(&slave->dev, "clock stop prepare failed:%d\n", ret);
976 return ret;
977 }
978 }
979 }
980
981
982 if (!is_slave)
983 return 0;
984
985
986
987
988
989 if (!simple_clk_stop) {
990 ret = sdw_bus_wait_for_clk_prep_deprep(bus,
991 SDW_BROADCAST_DEV_NUM);
992
993
994
995
996
997
998 if (ret < 0)
999 return ret;
1000 }
1001
1002
1003 list_for_each_entry(slave, &bus->slaves, node) {
1004 if (!slave->dev_num)
1005 continue;
1006
1007 if (slave->status != SDW_SLAVE_ATTACHED &&
1008 slave->status != SDW_SLAVE_ALERT)
1009 continue;
1010
1011 ret = sdw_slave_clk_stop_callback(slave,
1012 SDW_CLK_STOP_MODE0,
1013 SDW_CLK_POST_PREPARE);
1014
1015 if (ret < 0 && ret != -ENODATA) {
1016 dev_err(&slave->dev, "clock stop post-prepare cb failed:%d\n", ret);
1017 return ret;
1018 }
1019 }
1020
1021 return 0;
1022}
1023EXPORT_SYMBOL(sdw_bus_prep_clk_stop);
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033int sdw_bus_clk_stop(struct sdw_bus *bus)
1034{
1035 int ret;
1036
1037
1038
1039
1040
1041 ret = sdw_bwrite_no_pm(bus, SDW_BROADCAST_DEV_NUM,
1042 SDW_SCP_CTRL, SDW_SCP_CTRL_CLK_STP_NOW);
1043 if (ret < 0) {
1044 if (ret != -ENODATA)
1045 dev_err(bus->dev, "ClockStopNow Broadcast msg failed %d\n", ret);
1046 return ret;
1047 }
1048
1049 return 0;
1050}
1051EXPORT_SYMBOL(sdw_bus_clk_stop);
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062int sdw_bus_exit_clk_stop(struct sdw_bus *bus)
1063{
1064 bool simple_clk_stop = true;
1065 struct sdw_slave *slave;
1066 bool is_slave = false;
1067 int ret;
1068
1069
1070
1071
1072
1073
1074 list_for_each_entry(slave, &bus->slaves, node) {
1075 if (!slave->dev_num)
1076 continue;
1077
1078 if (slave->status != SDW_SLAVE_ATTACHED &&
1079 slave->status != SDW_SLAVE_ALERT)
1080 continue;
1081
1082
1083 is_slave = true;
1084
1085 ret = sdw_slave_clk_stop_callback(slave, SDW_CLK_STOP_MODE0,
1086 SDW_CLK_PRE_DEPREPARE);
1087 if (ret < 0)
1088 dev_warn(&slave->dev, "clock stop pre-deprepare cb failed:%d\n", ret);
1089
1090
1091 if (!slave->prop.simple_clk_stop_capable) {
1092 simple_clk_stop = false;
1093
1094 ret = sdw_slave_clk_stop_prepare(slave, SDW_CLK_STOP_MODE0,
1095 false);
1096
1097 if (ret < 0)
1098 dev_warn(&slave->dev, "clock stop deprepare failed:%d\n", ret);
1099 }
1100 }
1101
1102
1103 if (!is_slave)
1104 return 0;
1105
1106
1107
1108
1109
1110 if (!simple_clk_stop) {
1111 ret = sdw_bus_wait_for_clk_prep_deprep(bus, SDW_BROADCAST_DEV_NUM);
1112 if (ret < 0)
1113 dev_warn(&slave->dev, "clock stop deprepare wait failed:%d\n", ret);
1114 }
1115
1116 list_for_each_entry(slave, &bus->slaves, node) {
1117 if (!slave->dev_num)
1118 continue;
1119
1120 if (slave->status != SDW_SLAVE_ATTACHED &&
1121 slave->status != SDW_SLAVE_ALERT)
1122 continue;
1123
1124 ret = sdw_slave_clk_stop_callback(slave, SDW_CLK_STOP_MODE0,
1125 SDW_CLK_POST_DEPREPARE);
1126 if (ret < 0)
1127 dev_warn(&slave->dev, "clock stop post-deprepare cb failed:%d\n", ret);
1128 }
1129
1130 return 0;
1131}
1132EXPORT_SYMBOL(sdw_bus_exit_clk_stop);
1133
1134int sdw_configure_dpn_intr(struct sdw_slave *slave,
1135 int port, bool enable, int mask)
1136{
1137 u32 addr;
1138 int ret;
1139 u8 val = 0;
1140
1141 if (slave->bus->params.s_data_mode != SDW_PORT_DATA_MODE_NORMAL) {
1142 dev_dbg(&slave->dev, "TEST FAIL interrupt %s\n",
1143 enable ? "on" : "off");
1144 mask |= SDW_DPN_INT_TEST_FAIL;
1145 }
1146
1147 addr = SDW_DPN_INTMASK(port);
1148
1149
1150 if (enable) {
1151 val |= mask;
1152 val |= SDW_DPN_INT_PORT_READY;
1153 } else {
1154 val &= ~(mask);
1155 val &= ~SDW_DPN_INT_PORT_READY;
1156 }
1157
1158 ret = sdw_update(slave, addr, (mask | SDW_DPN_INT_PORT_READY), val);
1159 if (ret < 0)
1160 dev_err(&slave->dev,
1161 "SDW_DPN_INTMASK write failed:%d\n", val);
1162
1163 return ret;
1164}
1165
1166static int sdw_slave_set_frequency(struct sdw_slave *slave)
1167{
1168 u32 mclk_freq = slave->bus->prop.mclk_freq;
1169 u32 curr_freq = slave->bus->params.curr_dr_freq >> 1;
1170 unsigned int scale;
1171 u8 scale_index;
1172 u8 base;
1173 int ret;
1174
1175
1176
1177
1178
1179
1180 if (!slave->id.class_id)
1181 return 0;
1182
1183 if (!mclk_freq) {
1184 dev_err(&slave->dev,
1185 "no bus MCLK, cannot set SDW_SCP_BUS_CLOCK_BASE\n");
1186 return -EINVAL;
1187 }
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198 if (!(19200000 % mclk_freq)) {
1199 mclk_freq = 19200000;
1200 base = SDW_SCP_BASE_CLOCK_19200000_HZ;
1201 } else if (!(24000000 % mclk_freq)) {
1202 mclk_freq = 24000000;
1203 base = SDW_SCP_BASE_CLOCK_24000000_HZ;
1204 } else if (!(24576000 % mclk_freq)) {
1205 mclk_freq = 24576000;
1206 base = SDW_SCP_BASE_CLOCK_24576000_HZ;
1207 } else if (!(22579200 % mclk_freq)) {
1208 mclk_freq = 22579200;
1209 base = SDW_SCP_BASE_CLOCK_22579200_HZ;
1210 } else if (!(32000000 % mclk_freq)) {
1211 mclk_freq = 32000000;
1212 base = SDW_SCP_BASE_CLOCK_32000000_HZ;
1213 } else {
1214 dev_err(&slave->dev,
1215 "Unsupported clock base, mclk %d\n",
1216 mclk_freq);
1217 return -EINVAL;
1218 }
1219
1220 if (mclk_freq % curr_freq) {
1221 dev_err(&slave->dev,
1222 "mclk %d is not multiple of bus curr_freq %d\n",
1223 mclk_freq, curr_freq);
1224 return -EINVAL;
1225 }
1226
1227 scale = mclk_freq / curr_freq;
1228
1229
1230
1231
1232
1233 scale_index = ilog2(scale);
1234
1235 if (BIT(scale_index) != scale || scale_index > 6) {
1236 dev_err(&slave->dev,
1237 "No match found for scale %d, bus mclk %d curr_freq %d\n",
1238 scale, mclk_freq, curr_freq);
1239 return -EINVAL;
1240 }
1241 scale_index++;
1242
1243 ret = sdw_write_no_pm(slave, SDW_SCP_BUS_CLOCK_BASE, base);
1244 if (ret < 0) {
1245 dev_err(&slave->dev,
1246 "SDW_SCP_BUS_CLOCK_BASE write failed:%d\n", ret);
1247 return ret;
1248 }
1249
1250
1251 ret = sdw_write_no_pm(slave, SDW_SCP_BUSCLOCK_SCALE_B0, scale_index);
1252 if (ret < 0) {
1253 dev_err(&slave->dev,
1254 "SDW_SCP_BUSCLOCK_SCALE_B0 write failed:%d\n", ret);
1255 return ret;
1256 }
1257 ret = sdw_write_no_pm(slave, SDW_SCP_BUSCLOCK_SCALE_B1, scale_index);
1258 if (ret < 0)
1259 dev_err(&slave->dev,
1260 "SDW_SCP_BUSCLOCK_SCALE_B1 write failed:%d\n", ret);
1261
1262 dev_dbg(&slave->dev,
1263 "Configured bus base %d, scale %d, mclk %d, curr_freq %d\n",
1264 base, scale_index, mclk_freq, curr_freq);
1265
1266 return ret;
1267}
1268
1269static int sdw_initialize_slave(struct sdw_slave *slave)
1270{
1271 struct sdw_slave_prop *prop = &slave->prop;
1272 int status;
1273 int ret;
1274 u8 val;
1275
1276 ret = sdw_slave_set_frequency(slave);
1277 if (ret < 0)
1278 return ret;
1279
1280 if (slave->bus->prop.quirks & SDW_MASTER_QUIRKS_CLEAR_INITIAL_CLASH) {
1281
1282 status = sdw_read_no_pm(slave, SDW_SCP_INT1);
1283 if (status < 0) {
1284 dev_err(&slave->dev,
1285 "SDW_SCP_INT1 (BUS_CLASH) read failed:%d\n", status);
1286 return status;
1287 }
1288 if (status & SDW_SCP_INT1_BUS_CLASH) {
1289 dev_warn(&slave->dev, "Bus clash detected before INT mask is enabled\n");
1290 ret = sdw_write_no_pm(slave, SDW_SCP_INT1, SDW_SCP_INT1_BUS_CLASH);
1291 if (ret < 0) {
1292 dev_err(&slave->dev,
1293 "SDW_SCP_INT1 (BUS_CLASH) write failed:%d\n", ret);
1294 return ret;
1295 }
1296 }
1297 }
1298 if ((slave->bus->prop.quirks & SDW_MASTER_QUIRKS_CLEAR_INITIAL_PARITY) &&
1299 !(slave->prop.quirks & SDW_SLAVE_QUIRKS_INVALID_INITIAL_PARITY)) {
1300
1301 status = sdw_read_no_pm(slave, SDW_SCP_INT1);
1302 if (status < 0) {
1303 dev_err(&slave->dev,
1304 "SDW_SCP_INT1 (PARITY) read failed:%d\n", status);
1305 return status;
1306 }
1307 if (status & SDW_SCP_INT1_PARITY) {
1308 dev_warn(&slave->dev, "PARITY error detected before INT mask is enabled\n");
1309 ret = sdw_write_no_pm(slave, SDW_SCP_INT1, SDW_SCP_INT1_PARITY);
1310 if (ret < 0) {
1311 dev_err(&slave->dev,
1312 "SDW_SCP_INT1 (PARITY) write failed:%d\n", ret);
1313 return ret;
1314 }
1315 }
1316 }
1317
1318
1319
1320
1321
1322
1323
1324
1325 val = slave->prop.scp_int1_mask;
1326
1327
1328 ret = sdw_update_no_pm(slave, SDW_SCP_INTMASK1, val, val);
1329 if (ret < 0) {
1330 dev_err(&slave->dev,
1331 "SDW_SCP_INTMASK1 write failed:%d\n", ret);
1332 return ret;
1333 }
1334
1335
1336 if (!slave->prop.dp0_prop)
1337 return 0;
1338
1339
1340 val = prop->dp0_prop->imp_def_interrupts;
1341 val |= SDW_DP0_INT_PORT_READY | SDW_DP0_INT_BRA_FAILURE;
1342
1343 ret = sdw_update_no_pm(slave, SDW_DP0_INTMASK, val, val);
1344 if (ret < 0)
1345 dev_err(&slave->dev,
1346 "SDW_DP0_INTMASK read failed:%d\n", ret);
1347 return ret;
1348}
1349
1350static int sdw_handle_dp0_interrupt(struct sdw_slave *slave, u8 *slave_status)
1351{
1352 u8 clear, impl_int_mask;
1353 int status, status2, ret, count = 0;
1354
1355 status = sdw_read_no_pm(slave, SDW_DP0_INT);
1356 if (status < 0) {
1357 dev_err(&slave->dev,
1358 "SDW_DP0_INT read failed:%d\n", status);
1359 return status;
1360 }
1361
1362 do {
1363 clear = status & ~SDW_DP0_INTERRUPTS;
1364
1365 if (status & SDW_DP0_INT_TEST_FAIL) {
1366 dev_err(&slave->dev, "Test fail for port 0\n");
1367 clear |= SDW_DP0_INT_TEST_FAIL;
1368 }
1369
1370
1371
1372
1373
1374
1375 if (status & SDW_DP0_INT_PORT_READY) {
1376 complete(&slave->port_ready[0]);
1377 clear |= SDW_DP0_INT_PORT_READY;
1378 }
1379
1380 if (status & SDW_DP0_INT_BRA_FAILURE) {
1381 dev_err(&slave->dev, "BRA failed\n");
1382 clear |= SDW_DP0_INT_BRA_FAILURE;
1383 }
1384
1385 impl_int_mask = SDW_DP0_INT_IMPDEF1 |
1386 SDW_DP0_INT_IMPDEF2 | SDW_DP0_INT_IMPDEF3;
1387
1388 if (status & impl_int_mask) {
1389 clear |= impl_int_mask;
1390 *slave_status = clear;
1391 }
1392
1393
1394 ret = sdw_write_no_pm(slave, SDW_DP0_INT, clear);
1395 if (ret < 0) {
1396 dev_err(&slave->dev,
1397 "SDW_DP0_INT write failed:%d\n", ret);
1398 return ret;
1399 }
1400
1401
1402 status2 = sdw_read_no_pm(slave, SDW_DP0_INT);
1403 if (status2 < 0) {
1404 dev_err(&slave->dev,
1405 "SDW_DP0_INT read failed:%d\n", status2);
1406 return status2;
1407 }
1408
1409 status &= status2;
1410
1411 count++;
1412
1413
1414 } while ((status & SDW_DP0_INTERRUPTS) && (count < SDW_READ_INTR_CLEAR_RETRY));
1415
1416 if (count == SDW_READ_INTR_CLEAR_RETRY)
1417 dev_warn(&slave->dev, "Reached MAX_RETRY on DP0 read\n");
1418
1419 return ret;
1420}
1421
1422static int sdw_handle_port_interrupt(struct sdw_slave *slave,
1423 int port, u8 *slave_status)
1424{
1425 u8 clear, impl_int_mask;
1426 int status, status2, ret, count = 0;
1427 u32 addr;
1428
1429 if (port == 0)
1430 return sdw_handle_dp0_interrupt(slave, slave_status);
1431
1432 addr = SDW_DPN_INT(port);
1433 status = sdw_read_no_pm(slave, addr);
1434 if (status < 0) {
1435 dev_err(&slave->dev,
1436 "SDW_DPN_INT read failed:%d\n", status);
1437
1438 return status;
1439 }
1440
1441 do {
1442 clear = status & ~SDW_DPN_INTERRUPTS;
1443
1444 if (status & SDW_DPN_INT_TEST_FAIL) {
1445 dev_err(&slave->dev, "Test fail for port:%d\n", port);
1446 clear |= SDW_DPN_INT_TEST_FAIL;
1447 }
1448
1449
1450
1451
1452
1453 if (status & SDW_DPN_INT_PORT_READY) {
1454 complete(&slave->port_ready[port]);
1455 clear |= SDW_DPN_INT_PORT_READY;
1456 }
1457
1458 impl_int_mask = SDW_DPN_INT_IMPDEF1 |
1459 SDW_DPN_INT_IMPDEF2 | SDW_DPN_INT_IMPDEF3;
1460
1461 if (status & impl_int_mask) {
1462 clear |= impl_int_mask;
1463 *slave_status = clear;
1464 }
1465
1466
1467 ret = sdw_write_no_pm(slave, addr, clear);
1468 if (ret < 0) {
1469 dev_err(&slave->dev,
1470 "SDW_DPN_INT write failed:%d\n", ret);
1471 return ret;
1472 }
1473
1474
1475 status2 = sdw_read_no_pm(slave, addr);
1476 if (status2 < 0) {
1477 dev_err(&slave->dev,
1478 "SDW_DPN_INT read failed:%d\n", status2);
1479 return status2;
1480 }
1481
1482 status &= status2;
1483
1484 count++;
1485
1486
1487 } while ((status & SDW_DPN_INTERRUPTS) && (count < SDW_READ_INTR_CLEAR_RETRY));
1488
1489 if (count == SDW_READ_INTR_CLEAR_RETRY)
1490 dev_warn(&slave->dev, "Reached MAX_RETRY on port read");
1491
1492 return ret;
1493}
1494
1495static int sdw_handle_slave_alerts(struct sdw_slave *slave)
1496{
1497 struct sdw_slave_intr_status slave_intr;
1498 u8 clear = 0, bit, port_status[15] = {0};
1499 int port_num, stat, ret, count = 0;
1500 unsigned long port;
1501 bool slave_notify;
1502 u8 sdca_cascade = 0;
1503 u8 buf, buf2[2], _buf, _buf2[2];
1504 bool parity_check;
1505 bool parity_quirk;
1506
1507 sdw_modify_slave_status(slave, SDW_SLAVE_ALERT);
1508
1509 ret = pm_runtime_get_sync(&slave->dev);
1510 if (ret < 0 && ret != -EACCES) {
1511 dev_err(&slave->dev, "Failed to resume device: %d\n", ret);
1512 pm_runtime_put_noidle(&slave->dev);
1513 return ret;
1514 }
1515
1516
1517 ret = sdw_read_no_pm(slave, SDW_SCP_INT1);
1518 if (ret < 0) {
1519 dev_err(&slave->dev,
1520 "SDW_SCP_INT1 read failed:%d\n", ret);
1521 goto io_err;
1522 }
1523 buf = ret;
1524
1525 ret = sdw_nread_no_pm(slave, SDW_SCP_INTSTAT2, 2, buf2);
1526 if (ret < 0) {
1527 dev_err(&slave->dev,
1528 "SDW_SCP_INT2/3 read failed:%d\n", ret);
1529 goto io_err;
1530 }
1531
1532 if (slave->prop.is_sdca) {
1533 ret = sdw_read_no_pm(slave, SDW_DP0_INT);
1534 if (ret < 0) {
1535 dev_err(&slave->dev,
1536 "SDW_DP0_INT read failed:%d\n", ret);
1537 goto io_err;
1538 }
1539 sdca_cascade = ret & SDW_DP0_SDCA_CASCADE;
1540 }
1541
1542 do {
1543 slave_notify = false;
1544
1545
1546
1547
1548
1549 if (buf & SDW_SCP_INT1_PARITY) {
1550 parity_check = slave->prop.scp_int1_mask & SDW_SCP_INT1_PARITY;
1551 parity_quirk = !slave->first_interrupt_done &&
1552 (slave->prop.quirks & SDW_SLAVE_QUIRKS_INVALID_INITIAL_PARITY);
1553
1554 if (parity_check && !parity_quirk)
1555 dev_err(&slave->dev, "Parity error detected\n");
1556 clear |= SDW_SCP_INT1_PARITY;
1557 }
1558
1559 if (buf & SDW_SCP_INT1_BUS_CLASH) {
1560 if (slave->prop.scp_int1_mask & SDW_SCP_INT1_BUS_CLASH)
1561 dev_err(&slave->dev, "Bus clash detected\n");
1562 clear |= SDW_SCP_INT1_BUS_CLASH;
1563 }
1564
1565
1566
1567
1568
1569
1570
1571
1572 if (buf & SDW_SCP_INT1_IMPL_DEF) {
1573 if (slave->prop.scp_int1_mask & SDW_SCP_INT1_IMPL_DEF) {
1574 dev_dbg(&slave->dev, "Slave impl defined interrupt\n");
1575 slave_notify = true;
1576 }
1577 clear |= SDW_SCP_INT1_IMPL_DEF;
1578 }
1579
1580
1581 if (sdca_cascade)
1582 slave_notify = true;
1583
1584
1585 port = buf & SDW_SCP_INT1_PORT0_3;
1586
1587
1588 port = FIELD_GET(SDW_SCP_INT1_PORT0_3, port);
1589 for_each_set_bit(bit, &port, 8) {
1590 sdw_handle_port_interrupt(slave, bit,
1591 &port_status[bit]);
1592 }
1593
1594
1595 if (buf & SDW_SCP_INT1_SCP2_CASCADE) {
1596 port = buf2[0] & SDW_SCP_INTSTAT2_PORT4_10;
1597 for_each_set_bit(bit, &port, 8) {
1598
1599 port_num = bit + 3;
1600 sdw_handle_port_interrupt(slave,
1601 port_num,
1602 &port_status[port_num]);
1603 }
1604 }
1605
1606
1607 if (buf2[0] & SDW_SCP_INTSTAT2_SCP3_CASCADE) {
1608 port = buf2[1] & SDW_SCP_INTSTAT3_PORT11_14;
1609 for_each_set_bit(bit, &port, 8) {
1610
1611 port_num = bit + 10;
1612 sdw_handle_port_interrupt(slave,
1613 port_num,
1614 &port_status[port_num]);
1615 }
1616 }
1617
1618
1619 if (slave_notify && slave->ops &&
1620 slave->ops->interrupt_callback) {
1621 slave_intr.sdca_cascade = sdca_cascade;
1622 slave_intr.control_port = clear;
1623 memcpy(slave_intr.port, &port_status,
1624 sizeof(slave_intr.port));
1625
1626 slave->ops->interrupt_callback(slave, &slave_intr);
1627 }
1628
1629
1630 ret = sdw_write_no_pm(slave, SDW_SCP_INT1, clear);
1631 if (ret < 0) {
1632 dev_err(&slave->dev,
1633 "SDW_SCP_INT1 write failed:%d\n", ret);
1634 goto io_err;
1635 }
1636
1637
1638 slave->first_interrupt_done = true;
1639
1640
1641
1642
1643
1644 ret = sdw_read_no_pm(slave, SDW_SCP_INT1);
1645 if (ret < 0) {
1646 dev_err(&slave->dev,
1647 "SDW_SCP_INT1 recheck read failed:%d\n", ret);
1648 goto io_err;
1649 }
1650 _buf = ret;
1651
1652 ret = sdw_nread_no_pm(slave, SDW_SCP_INTSTAT2, 2, _buf2);
1653 if (ret < 0) {
1654 dev_err(&slave->dev,
1655 "SDW_SCP_INT2/3 recheck read failed:%d\n", ret);
1656 goto io_err;
1657 }
1658
1659 if (slave->prop.is_sdca) {
1660 ret = sdw_read_no_pm(slave, SDW_DP0_INT);
1661 if (ret < 0) {
1662 dev_err(&slave->dev,
1663 "SDW_DP0_INT recheck read failed:%d\n", ret);
1664 goto io_err;
1665 }
1666 sdca_cascade = ret & SDW_DP0_SDCA_CASCADE;
1667 }
1668
1669
1670
1671
1672
1673 buf &= _buf;
1674 buf2[0] &= _buf2[0];
1675 buf2[1] &= _buf2[1];
1676 stat = buf || buf2[0] || buf2[1] || sdca_cascade;
1677
1678
1679
1680
1681
1682 count++;
1683
1684
1685 } while (stat != 0 && count < SDW_READ_INTR_CLEAR_RETRY);
1686
1687 if (count == SDW_READ_INTR_CLEAR_RETRY)
1688 dev_warn(&slave->dev, "Reached MAX_RETRY on alert read\n");
1689
1690io_err:
1691 pm_runtime_mark_last_busy(&slave->dev);
1692 pm_runtime_put_autosuspend(&slave->dev);
1693
1694 return ret;
1695}
1696
1697static int sdw_update_slave_status(struct sdw_slave *slave,
1698 enum sdw_slave_status status)
1699{
1700 unsigned long time;
1701
1702 if (!slave->probed) {
1703
1704
1705
1706
1707
1708
1709
1710
1711 time = wait_for_completion_timeout(&slave->probe_complete,
1712 msecs_to_jiffies(DEFAULT_PROBE_TIMEOUT));
1713 if (!time) {
1714 dev_err(&slave->dev, "Probe not complete, timed out\n");
1715 return -ETIMEDOUT;
1716 }
1717 }
1718
1719 if (!slave->ops || !slave->ops->update_status)
1720 return 0;
1721
1722 return slave->ops->update_status(slave, status);
1723}
1724
1725
1726
1727
1728
1729
1730int sdw_handle_slave_status(struct sdw_bus *bus,
1731 enum sdw_slave_status status[])
1732{
1733 enum sdw_slave_status prev_status;
1734 struct sdw_slave *slave;
1735 bool attached_initializing;
1736 int i, ret = 0;
1737
1738
1739 for (i = 1; i <= SDW_MAX_DEVICES; i++) {
1740 mutex_lock(&bus->bus_lock);
1741 if (test_bit(i, bus->assigned) == false) {
1742 mutex_unlock(&bus->bus_lock);
1743 continue;
1744 }
1745 mutex_unlock(&bus->bus_lock);
1746
1747 slave = sdw_get_slave(bus, i);
1748 if (!slave)
1749 continue;
1750
1751 if (status[i] == SDW_SLAVE_UNATTACHED &&
1752 slave->status != SDW_SLAVE_UNATTACHED)
1753 sdw_modify_slave_status(slave, SDW_SLAVE_UNATTACHED);
1754 }
1755
1756 if (status[0] == SDW_SLAVE_ATTACHED) {
1757 dev_dbg(bus->dev, "Slave attached, programming device number\n");
1758 ret = sdw_program_device_num(bus);
1759 if (ret < 0)
1760 dev_err(bus->dev, "Slave attach failed: %d\n", ret);
1761
1762
1763
1764
1765 return ret;
1766 }
1767
1768
1769 for (i = 1; i <= SDW_MAX_DEVICES; i++) {
1770 mutex_lock(&bus->bus_lock);
1771 if (test_bit(i, bus->assigned) == false) {
1772 mutex_unlock(&bus->bus_lock);
1773 continue;
1774 }
1775 mutex_unlock(&bus->bus_lock);
1776
1777 slave = sdw_get_slave(bus, i);
1778 if (!slave)
1779 continue;
1780
1781 attached_initializing = false;
1782
1783 switch (status[i]) {
1784 case SDW_SLAVE_UNATTACHED:
1785 if (slave->status == SDW_SLAVE_UNATTACHED)
1786 break;
1787
1788 sdw_modify_slave_status(slave, SDW_SLAVE_UNATTACHED);
1789 break;
1790
1791 case SDW_SLAVE_ALERT:
1792 ret = sdw_handle_slave_alerts(slave);
1793 if (ret < 0)
1794 dev_err(&slave->dev,
1795 "Slave %d alert handling failed: %d\n",
1796 i, ret);
1797 break;
1798
1799 case SDW_SLAVE_ATTACHED:
1800 if (slave->status == SDW_SLAVE_ATTACHED)
1801 break;
1802
1803 prev_status = slave->status;
1804 sdw_modify_slave_status(slave, SDW_SLAVE_ATTACHED);
1805
1806 if (prev_status == SDW_SLAVE_ALERT)
1807 break;
1808
1809 attached_initializing = true;
1810
1811 ret = sdw_initialize_slave(slave);
1812 if (ret < 0)
1813 dev_err(&slave->dev,
1814 "Slave %d initialization failed: %d\n",
1815 i, ret);
1816
1817 break;
1818
1819 default:
1820 dev_err(&slave->dev, "Invalid slave %d status:%d\n",
1821 i, status[i]);
1822 break;
1823 }
1824
1825 ret = sdw_update_slave_status(slave, status[i]);
1826 if (ret < 0)
1827 dev_err(&slave->dev,
1828 "Update Slave status failed:%d\n", ret);
1829 if (attached_initializing) {
1830 dev_dbg(&slave->dev,
1831 "%s: signaling initialization completion for Slave %d\n",
1832 __func__, slave->dev_num);
1833
1834 complete(&slave->initialization_complete);
1835 }
1836 }
1837
1838 return ret;
1839}
1840EXPORT_SYMBOL(sdw_handle_slave_status);
1841
1842void sdw_clear_slave_status(struct sdw_bus *bus, u32 request)
1843{
1844 struct sdw_slave *slave;
1845 int i;
1846
1847
1848 for (i = 1; i <= SDW_MAX_DEVICES; i++) {
1849 mutex_lock(&bus->bus_lock);
1850 if (test_bit(i, bus->assigned) == false) {
1851 mutex_unlock(&bus->bus_lock);
1852 continue;
1853 }
1854 mutex_unlock(&bus->bus_lock);
1855
1856 slave = sdw_get_slave(bus, i);
1857 if (!slave)
1858 continue;
1859
1860 if (slave->status != SDW_SLAVE_UNATTACHED) {
1861 sdw_modify_slave_status(slave, SDW_SLAVE_UNATTACHED);
1862 slave->first_interrupt_done = false;
1863 sdw_update_slave_status(slave, SDW_SLAVE_UNATTACHED);
1864 }
1865
1866
1867 slave->unattach_request = request;
1868 }
1869}
1870EXPORT_SYMBOL(sdw_clear_slave_status);
1871