forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 449
/
Copy pathti_sci.c
3918 lines (3411 loc) · 109 KB
/
ti_sci.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
// SPDX-License-Identifier: GPL-2.0
/*
* Texas Instruments System Control Interface Protocol Driver
*
* Copyright (C) 2015-2024 Texas Instruments Incorporated - https://www.ti.com/
* Nishanth Menon
*/
#define pr_fmt(fmt) "%s: " fmt, __func__
#include <linux/bitmap.h>
#include <linux/cpu.h>
#include <linux/debugfs.h>
#include <linux/export.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/kernel.h>
#include <linux/mailbox_client.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pm_qos.h>
#include <linux/property.h>
#include <linux/semaphore.h>
#include <linux/slab.h>
#include <linux/soc/ti/ti-msgmgr.h>
#include <linux/soc/ti/ti_sci_protocol.h>
#include <linux/suspend.h>
#include <linux/sys_soc.h>
#include <linux/reboot.h>
#include "ti_sci.h"
/* List of all TI SCI devices active in system */
static LIST_HEAD(ti_sci_list);
/* Protection for the entire list */
static DEFINE_MUTEX(ti_sci_list_mutex);
/**
* struct ti_sci_xfer - Structure representing a message flow
* @tx_message: Transmit message
* @rx_len: Receive message length
* @xfer_buf: Preallocated buffer to store receive message
* Since we work with request-ACK protocol, we can
* reuse the same buffer for the rx path as we
* use for the tx path.
* @done: completion event
*/
struct ti_sci_xfer {
struct ti_msgmgr_message tx_message;
u8 rx_len;
u8 *xfer_buf;
struct completion done;
};
/**
* struct ti_sci_xfers_info - Structure to manage transfer information
* @sem_xfer_count: Counting Semaphore for managing max simultaneous
* Messages.
* @xfer_block: Preallocated Message array
* @xfer_alloc_table: Bitmap table for allocated messages.
* Index of this bitmap table is also used for message
* sequence identifier.
* @xfer_lock: Protection for message allocation
*/
struct ti_sci_xfers_info {
struct semaphore sem_xfer_count;
struct ti_sci_xfer *xfer_block;
unsigned long *xfer_alloc_table;
/* protect transfer allocation */
spinlock_t xfer_lock;
};
/**
* struct ti_sci_desc - Description of SoC integration
* @default_host_id: Host identifier representing the compute entity
* @max_rx_timeout_ms: Timeout for communication with SoC (in Milliseconds)
* @max_msgs: Maximum number of messages that can be pending
* simultaneously in the system
* @max_msg_size: Maximum size of data per message that can be handled.
*/
struct ti_sci_desc {
u8 default_host_id;
int max_rx_timeout_ms;
int max_msgs;
int max_msg_size;
};
/**
* struct ti_sci_info - Structure representing a TI SCI instance
* @dev: Device pointer
* @desc: SoC description for this instance
* @d: Debugfs file entry
* @debug_region: Memory region where the debug message are available
* @debug_region_size: Debug region size
* @debug_buffer: Buffer allocated to copy debug messages.
* @handle: Instance of TI SCI handle to send to clients.
* @cl: Mailbox Client
* @chan_tx: Transmit mailbox channel
* @chan_rx: Receive mailbox channel
* @minfo: Message info
* @node: list head
* @host_id: Host ID
* @fw_caps: FW/SoC low power capabilities
* @users: Number of users of this instance
*/
struct ti_sci_info {
struct device *dev;
const struct ti_sci_desc *desc;
struct dentry *d;
void __iomem *debug_region;
char *debug_buffer;
size_t debug_region_size;
struct ti_sci_handle handle;
struct mbox_client cl;
struct mbox_chan *chan_tx;
struct mbox_chan *chan_rx;
struct ti_sci_xfers_info minfo;
struct list_head node;
u8 host_id;
u64 fw_caps;
/* protected by ti_sci_list_mutex */
int users;
};
#define cl_to_ti_sci_info(c) container_of(c, struct ti_sci_info, cl)
#define handle_to_ti_sci_info(h) container_of(h, struct ti_sci_info, handle)
#ifdef CONFIG_DEBUG_FS
/**
* ti_sci_debug_show() - Helper to dump the debug log
* @s: sequence file pointer
* @unused: unused.
*
* Return: 0
*/
static int ti_sci_debug_show(struct seq_file *s, void *unused)
{
struct ti_sci_info *info = s->private;
memcpy_fromio(info->debug_buffer, info->debug_region,
info->debug_region_size);
/*
* We don't trust firmware to leave NULL terminated last byte (hence
* we have allocated 1 extra 0 byte). Since we cannot guarantee any
* specific data format for debug messages, We just present the data
* in the buffer as is - we expect the messages to be self explanatory.
*/
seq_puts(s, info->debug_buffer);
return 0;
}
/* Provide the log file operations interface*/
DEFINE_SHOW_ATTRIBUTE(ti_sci_debug);
/**
* ti_sci_debugfs_create() - Create log debug file
* @pdev: platform device pointer
* @info: Pointer to SCI entity information
*
* Return: 0 if all went fine, else corresponding error.
*/
static int ti_sci_debugfs_create(struct platform_device *pdev,
struct ti_sci_info *info)
{
struct device *dev = &pdev->dev;
struct resource *res;
char debug_name[50];
/* Debug region is optional */
res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
"debug_messages");
info->debug_region = devm_ioremap_resource(dev, res);
if (IS_ERR(info->debug_region))
return 0;
info->debug_region_size = resource_size(res);
info->debug_buffer = devm_kcalloc(dev, info->debug_region_size + 1,
sizeof(char), GFP_KERNEL);
if (!info->debug_buffer)
return -ENOMEM;
/* Setup NULL termination */
info->debug_buffer[info->debug_region_size] = 0;
snprintf(debug_name, sizeof(debug_name), "ti_sci_debug@%s",
dev_name(dev));
info->d = debugfs_create_file(debug_name, 0444, NULL, info,
&ti_sci_debug_fops);
if (IS_ERR(info->d))
return PTR_ERR(info->d);
dev_dbg(dev, "Debug region => %p, size = %zu bytes, resource: %pr\n",
info->debug_region, info->debug_region_size, res);
return 0;
}
#else /* CONFIG_DEBUG_FS */
static inline int ti_sci_debugfs_create(struct platform_device *dev,
struct ti_sci_info *info)
{
return 0;
}
static inline void ti_sci_debugfs_destroy(struct platform_device *dev,
struct ti_sci_info *info)
{
}
#endif /* CONFIG_DEBUG_FS */
/**
* ti_sci_dump_header_dbg() - Helper to dump a message header.
* @dev: Device pointer corresponding to the SCI entity
* @hdr: pointer to header.
*/
static inline void ti_sci_dump_header_dbg(struct device *dev,
struct ti_sci_msg_hdr *hdr)
{
dev_dbg(dev, "MSGHDR:type=0x%04x host=0x%02x seq=0x%02x flags=0x%08x\n",
hdr->type, hdr->host, hdr->seq, hdr->flags);
}
/**
* ti_sci_rx_callback() - mailbox client callback for receive messages
* @cl: client pointer
* @m: mailbox message
*
* Processes one received message to appropriate transfer information and
* signals completion of the transfer.
*
* NOTE: This function will be invoked in IRQ context, hence should be
* as optimal as possible.
*/
static void ti_sci_rx_callback(struct mbox_client *cl, void *m)
{
struct ti_sci_info *info = cl_to_ti_sci_info(cl);
struct device *dev = info->dev;
struct ti_sci_xfers_info *minfo = &info->minfo;
struct ti_msgmgr_message *mbox_msg = m;
struct ti_sci_msg_hdr *hdr = (struct ti_sci_msg_hdr *)mbox_msg->buf;
struct ti_sci_xfer *xfer;
u8 xfer_id;
xfer_id = hdr->seq;
/*
* Are we even expecting this?
* NOTE: barriers were implicit in locks used for modifying the bitmap
*/
if (!test_bit(xfer_id, minfo->xfer_alloc_table)) {
dev_err(dev, "Message for %d is not expected!\n", xfer_id);
return;
}
xfer = &minfo->xfer_block[xfer_id];
/* Is the message of valid length? */
if (mbox_msg->len > info->desc->max_msg_size) {
dev_err(dev, "Unable to handle %zu xfer(max %d)\n",
mbox_msg->len, info->desc->max_msg_size);
ti_sci_dump_header_dbg(dev, hdr);
return;
}
if (mbox_msg->len < xfer->rx_len) {
dev_err(dev, "Recv xfer %zu < expected %d length\n",
mbox_msg->len, xfer->rx_len);
ti_sci_dump_header_dbg(dev, hdr);
return;
}
ti_sci_dump_header_dbg(dev, hdr);
/* Take a copy to the rx buffer.. */
memcpy(xfer->xfer_buf, mbox_msg->buf, xfer->rx_len);
complete(&xfer->done);
}
/**
* ti_sci_get_one_xfer() - Allocate one message
* @info: Pointer to SCI entity information
* @msg_type: Message type
* @msg_flags: Flag to set for the message
* @tx_message_size: transmit message size
* @rx_message_size: receive message size
*
* Helper function which is used by various command functions that are
* exposed to clients of this driver for allocating a message traffic event.
*
* This function can sleep depending on pending requests already in the system
* for the SCI entity. Further, this also holds a spinlock to maintain integrity
* of internal data structures.
*
* Return: 0 if all went fine, else corresponding error.
*/
static struct ti_sci_xfer *ti_sci_get_one_xfer(struct ti_sci_info *info,
u16 msg_type, u32 msg_flags,
size_t tx_message_size,
size_t rx_message_size)
{
struct ti_sci_xfers_info *minfo = &info->minfo;
struct ti_sci_xfer *xfer;
struct ti_sci_msg_hdr *hdr;
unsigned long flags;
unsigned long bit_pos;
u8 xfer_id;
int ret;
int timeout;
/* Ensure we have sane transfer sizes */
if (rx_message_size > info->desc->max_msg_size ||
tx_message_size > info->desc->max_msg_size ||
rx_message_size < sizeof(*hdr) || tx_message_size < sizeof(*hdr))
return ERR_PTR(-ERANGE);
/*
* Ensure we have only controlled number of pending messages.
* Ideally, we might just have to wait a single message, be
* conservative and wait 5 times that..
*/
timeout = msecs_to_jiffies(info->desc->max_rx_timeout_ms) * 5;
ret = down_timeout(&minfo->sem_xfer_count, timeout);
if (ret < 0)
return ERR_PTR(ret);
/* Keep the locked section as small as possible */
spin_lock_irqsave(&minfo->xfer_lock, flags);
bit_pos = find_first_zero_bit(minfo->xfer_alloc_table,
info->desc->max_msgs);
set_bit(bit_pos, minfo->xfer_alloc_table);
spin_unlock_irqrestore(&minfo->xfer_lock, flags);
/*
* We already ensured in probe that we can have max messages that can
* fit in hdr.seq - NOTE: this improves access latencies
* to predictable O(1) access, BUT, it opens us to risk if
* remote misbehaves with corrupted message sequence responses.
* If that happens, we are going to be messed up anyways..
*/
xfer_id = (u8)bit_pos;
xfer = &minfo->xfer_block[xfer_id];
hdr = (struct ti_sci_msg_hdr *)xfer->tx_message.buf;
xfer->tx_message.len = tx_message_size;
xfer->tx_message.chan_rx = info->chan_rx;
xfer->tx_message.timeout_rx_ms = info->desc->max_rx_timeout_ms;
xfer->rx_len = (u8)rx_message_size;
reinit_completion(&xfer->done);
hdr->seq = xfer_id;
hdr->type = msg_type;
hdr->host = info->host_id;
hdr->flags = msg_flags;
return xfer;
}
/**
* ti_sci_put_one_xfer() - Release a message
* @minfo: transfer info pointer
* @xfer: message that was reserved by ti_sci_get_one_xfer
*
* This holds a spinlock to maintain integrity of internal data structures.
*/
static void ti_sci_put_one_xfer(struct ti_sci_xfers_info *minfo,
struct ti_sci_xfer *xfer)
{
unsigned long flags;
struct ti_sci_msg_hdr *hdr;
u8 xfer_id;
hdr = (struct ti_sci_msg_hdr *)xfer->tx_message.buf;
xfer_id = hdr->seq;
/*
* Keep the locked section as small as possible
* NOTE: we might escape with smp_mb and no lock here..
* but just be conservative and symmetric.
*/
spin_lock_irqsave(&minfo->xfer_lock, flags);
clear_bit(xfer_id, minfo->xfer_alloc_table);
spin_unlock_irqrestore(&minfo->xfer_lock, flags);
/* Increment the count for the next user to get through */
up(&minfo->sem_xfer_count);
}
/**
* ti_sci_do_xfer() - Do one transfer
* @info: Pointer to SCI entity information
* @xfer: Transfer to initiate and wait for response
*
* Return: -ETIMEDOUT in case of no response, if transmit error,
* return corresponding error, else if all goes well,
* return 0.
*/
static inline int ti_sci_do_xfer(struct ti_sci_info *info,
struct ti_sci_xfer *xfer)
{
int ret;
int timeout;
struct device *dev = info->dev;
bool done_state = true;
ret = mbox_send_message(info->chan_tx, &xfer->tx_message);
if (ret < 0)
return ret;
ret = 0;
if (system_state <= SYSTEM_RUNNING) {
/* And we wait for the response. */
timeout = msecs_to_jiffies(info->desc->max_rx_timeout_ms);
if (!wait_for_completion_timeout(&xfer->done, timeout))
ret = -ETIMEDOUT;
} else {
/*
* If we are !running, we cannot use wait_for_completion_timeout
* during noirq phase, so we must manually poll the completion.
*/
ret = read_poll_timeout_atomic(try_wait_for_completion, done_state,
done_state, 1,
info->desc->max_rx_timeout_ms * 1000,
false, &xfer->done);
}
if (ret == -ETIMEDOUT)
dev_err(dev, "Mbox timedout in resp(caller: %pS)\n",
(void *)_RET_IP_);
/*
* NOTE: we might prefer not to need the mailbox ticker to manage the
* transfer queueing since the protocol layer queues things by itself.
* Unfortunately, we have to kick the mailbox framework after we have
* received our message.
*/
mbox_client_txdone(info->chan_tx, ret);
return ret;
}
/**
* ti_sci_cmd_get_revision() - command to get the revision of the SCI entity
* @info: Pointer to SCI entity information
*
* Updates the SCI information in the internal data structure.
*
* Return: 0 if all went fine, else return appropriate error.
*/
static int ti_sci_cmd_get_revision(struct ti_sci_info *info)
{
struct device *dev = info->dev;
struct ti_sci_handle *handle = &info->handle;
struct ti_sci_version_info *ver = &handle->version;
struct ti_sci_msg_resp_version *rev_info;
struct ti_sci_xfer *xfer;
int ret;
xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_VERSION,
TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
sizeof(struct ti_sci_msg_hdr),
sizeof(*rev_info));
if (IS_ERR(xfer)) {
ret = PTR_ERR(xfer);
dev_err(dev, "Message alloc failed(%d)\n", ret);
return ret;
}
rev_info = (struct ti_sci_msg_resp_version *)xfer->xfer_buf;
ret = ti_sci_do_xfer(info, xfer);
if (ret) {
dev_err(dev, "Mbox send fail %d\n", ret);
goto fail;
}
ver->abi_major = rev_info->abi_major;
ver->abi_minor = rev_info->abi_minor;
ver->firmware_revision = rev_info->firmware_revision;
strscpy(ver->firmware_description, rev_info->firmware_description,
sizeof(ver->firmware_description));
fail:
ti_sci_put_one_xfer(&info->minfo, xfer);
return ret;
}
/**
* ti_sci_is_response_ack() - Generic ACK/NACK message checkup
* @r: pointer to response buffer
*
* Return: true if the response was an ACK, else returns false.
*/
static inline bool ti_sci_is_response_ack(void *r)
{
struct ti_sci_msg_hdr *hdr = r;
return hdr->flags & TI_SCI_FLAG_RESP_GENERIC_ACK ? true : false;
}
/**
* ti_sci_set_device_state() - Set device state helper
* @handle: pointer to TI SCI handle
* @id: Device identifier
* @flags: flags to setup for the device
* @state: State to move the device to
*
* Return: 0 if all went well, else returns appropriate error value.
*/
static int ti_sci_set_device_state(const struct ti_sci_handle *handle,
u32 id, u32 flags, u8 state)
{
struct ti_sci_info *info;
struct ti_sci_msg_req_set_device_state *req;
struct ti_sci_msg_hdr *resp;
struct ti_sci_xfer *xfer;
struct device *dev;
int ret = 0;
if (IS_ERR(handle))
return PTR_ERR(handle);
if (!handle)
return -EINVAL;
info = handle_to_ti_sci_info(handle);
dev = info->dev;
xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_SET_DEVICE_STATE,
flags | TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
sizeof(*req), sizeof(*resp));
if (IS_ERR(xfer)) {
ret = PTR_ERR(xfer);
dev_err(dev, "Message alloc failed(%d)\n", ret);
return ret;
}
req = (struct ti_sci_msg_req_set_device_state *)xfer->xfer_buf;
req->id = id;
req->state = state;
ret = ti_sci_do_xfer(info, xfer);
if (ret) {
dev_err(dev, "Mbox send fail %d\n", ret);
goto fail;
}
resp = (struct ti_sci_msg_hdr *)xfer->xfer_buf;
ret = ti_sci_is_response_ack(resp) ? 0 : -ENODEV;
fail:
ti_sci_put_one_xfer(&info->minfo, xfer);
return ret;
}
/**
* ti_sci_get_device_state() - Get device state helper
* @handle: Handle to the device
* @id: Device Identifier
* @clcnt: Pointer to Context Loss Count
* @resets: pointer to resets
* @p_state: pointer to p_state
* @c_state: pointer to c_state
*
* Return: 0 if all went fine, else return appropriate error.
*/
static int ti_sci_get_device_state(const struct ti_sci_handle *handle,
u32 id, u32 *clcnt, u32 *resets,
u8 *p_state, u8 *c_state)
{
struct ti_sci_info *info;
struct ti_sci_msg_req_get_device_state *req;
struct ti_sci_msg_resp_get_device_state *resp;
struct ti_sci_xfer *xfer;
struct device *dev;
int ret = 0;
if (IS_ERR(handle))
return PTR_ERR(handle);
if (!handle)
return -EINVAL;
if (!clcnt && !resets && !p_state && !c_state)
return -EINVAL;
info = handle_to_ti_sci_info(handle);
dev = info->dev;
xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_GET_DEVICE_STATE,
TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
sizeof(*req), sizeof(*resp));
if (IS_ERR(xfer)) {
ret = PTR_ERR(xfer);
dev_err(dev, "Message alloc failed(%d)\n", ret);
return ret;
}
req = (struct ti_sci_msg_req_get_device_state *)xfer->xfer_buf;
req->id = id;
ret = ti_sci_do_xfer(info, xfer);
if (ret) {
dev_err(dev, "Mbox send fail %d\n", ret);
goto fail;
}
resp = (struct ti_sci_msg_resp_get_device_state *)xfer->xfer_buf;
if (!ti_sci_is_response_ack(resp)) {
ret = -ENODEV;
goto fail;
}
if (clcnt)
*clcnt = resp->context_loss_count;
if (resets)
*resets = resp->resets;
if (p_state)
*p_state = resp->programmed_state;
if (c_state)
*c_state = resp->current_state;
fail:
ti_sci_put_one_xfer(&info->minfo, xfer);
return ret;
}
/**
* ti_sci_cmd_get_device() - command to request for device managed by TISCI
* that can be shared with other hosts.
* @handle: Pointer to TISCI handle as retrieved by *ti_sci_get_handle
* @id: Device Identifier
*
* Request for the device - NOTE: the client MUST maintain integrity of
* usage count by balancing get_device with put_device. No refcounting is
* managed by driver for that purpose.
*
* Return: 0 if all went fine, else return appropriate error.
*/
static int ti_sci_cmd_get_device(const struct ti_sci_handle *handle, u32 id)
{
return ti_sci_set_device_state(handle, id, 0,
MSG_DEVICE_SW_STATE_ON);
}
/**
* ti_sci_cmd_get_device_exclusive() - command to request for device managed by
* TISCI that is exclusively owned by the
* requesting host.
* @handle: Pointer to TISCI handle as retrieved by *ti_sci_get_handle
* @id: Device Identifier
*
* Request for the device - NOTE: the client MUST maintain integrity of
* usage count by balancing get_device with put_device. No refcounting is
* managed by driver for that purpose.
*
* Return: 0 if all went fine, else return appropriate error.
*/
static int ti_sci_cmd_get_device_exclusive(const struct ti_sci_handle *handle,
u32 id)
{
return ti_sci_set_device_state(handle, id,
MSG_FLAG_DEVICE_EXCLUSIVE,
MSG_DEVICE_SW_STATE_ON);
}
/**
* ti_sci_cmd_idle_device() - Command to idle a device managed by TISCI
* @handle: Pointer to TISCI handle as retrieved by *ti_sci_get_handle
* @id: Device Identifier
*
* Request for the device - NOTE: the client MUST maintain integrity of
* usage count by balancing get_device with put_device. No refcounting is
* managed by driver for that purpose.
*
* Return: 0 if all went fine, else return appropriate error.
*/
static int ti_sci_cmd_idle_device(const struct ti_sci_handle *handle, u32 id)
{
return ti_sci_set_device_state(handle, id, 0,
MSG_DEVICE_SW_STATE_RETENTION);
}
/**
* ti_sci_cmd_idle_device_exclusive() - Command to idle a device managed by
* TISCI that is exclusively owned by
* requesting host.
* @handle: Pointer to TISCI handle as retrieved by *ti_sci_get_handle
* @id: Device Identifier
*
* Request for the device - NOTE: the client MUST maintain integrity of
* usage count by balancing get_device with put_device. No refcounting is
* managed by driver for that purpose.
*
* Return: 0 if all went fine, else return appropriate error.
*/
static int ti_sci_cmd_idle_device_exclusive(const struct ti_sci_handle *handle,
u32 id)
{
return ti_sci_set_device_state(handle, id,
MSG_FLAG_DEVICE_EXCLUSIVE,
MSG_DEVICE_SW_STATE_RETENTION);
}
/**
* ti_sci_cmd_put_device() - command to release a device managed by TISCI
* @handle: Pointer to TISCI handle as retrieved by *ti_sci_get_handle
* @id: Device Identifier
*
* Request for the device - NOTE: the client MUST maintain integrity of
* usage count by balancing get_device with put_device. No refcounting is
* managed by driver for that purpose.
*
* Return: 0 if all went fine, else return appropriate error.
*/
static int ti_sci_cmd_put_device(const struct ti_sci_handle *handle, u32 id)
{
return ti_sci_set_device_state(handle, id,
0, MSG_DEVICE_SW_STATE_AUTO_OFF);
}
/**
* ti_sci_cmd_dev_is_valid() - Is the device valid
* @handle: Pointer to TISCI handle as retrieved by *ti_sci_get_handle
* @id: Device Identifier
*
* Return: 0 if all went fine and the device ID is valid, else return
* appropriate error.
*/
static int ti_sci_cmd_dev_is_valid(const struct ti_sci_handle *handle, u32 id)
{
u8 unused;
/* check the device state which will also tell us if the ID is valid */
return ti_sci_get_device_state(handle, id, NULL, NULL, NULL, &unused);
}
/**
* ti_sci_cmd_dev_get_clcnt() - Get context loss counter
* @handle: Pointer to TISCI handle
* @id: Device Identifier
* @count: Pointer to Context Loss counter to populate
*
* Return: 0 if all went fine, else return appropriate error.
*/
static int ti_sci_cmd_dev_get_clcnt(const struct ti_sci_handle *handle, u32 id,
u32 *count)
{
return ti_sci_get_device_state(handle, id, count, NULL, NULL, NULL);
}
/**
* ti_sci_cmd_dev_is_idle() - Check if the device is requested to be idle
* @handle: Pointer to TISCI handle
* @id: Device Identifier
* @r_state: true if requested to be idle
*
* Return: 0 if all went fine, else return appropriate error.
*/
static int ti_sci_cmd_dev_is_idle(const struct ti_sci_handle *handle, u32 id,
bool *r_state)
{
int ret;
u8 state;
if (!r_state)
return -EINVAL;
ret = ti_sci_get_device_state(handle, id, NULL, NULL, &state, NULL);
if (ret)
return ret;
*r_state = (state == MSG_DEVICE_SW_STATE_RETENTION);
return 0;
}
/**
* ti_sci_cmd_dev_is_stop() - Check if the device is requested to be stopped
* @handle: Pointer to TISCI handle
* @id: Device Identifier
* @r_state: true if requested to be stopped
* @curr_state: true if currently stopped.
*
* Return: 0 if all went fine, else return appropriate error.
*/
static int ti_sci_cmd_dev_is_stop(const struct ti_sci_handle *handle, u32 id,
bool *r_state, bool *curr_state)
{
int ret;
u8 p_state, c_state;
if (!r_state && !curr_state)
return -EINVAL;
ret =
ti_sci_get_device_state(handle, id, NULL, NULL, &p_state, &c_state);
if (ret)
return ret;
if (r_state)
*r_state = (p_state == MSG_DEVICE_SW_STATE_AUTO_OFF);
if (curr_state)
*curr_state = (c_state == MSG_DEVICE_HW_STATE_OFF);
return 0;
}
/**
* ti_sci_cmd_dev_is_on() - Check if the device is requested to be ON
* @handle: Pointer to TISCI handle
* @id: Device Identifier
* @r_state: true if requested to be ON
* @curr_state: true if currently ON and active
*
* Return: 0 if all went fine, else return appropriate error.
*/
static int ti_sci_cmd_dev_is_on(const struct ti_sci_handle *handle, u32 id,
bool *r_state, bool *curr_state)
{
int ret;
u8 p_state, c_state;
if (!r_state && !curr_state)
return -EINVAL;
ret =
ti_sci_get_device_state(handle, id, NULL, NULL, &p_state, &c_state);
if (ret)
return ret;
if (r_state)
*r_state = (p_state == MSG_DEVICE_SW_STATE_ON);
if (curr_state)
*curr_state = (c_state == MSG_DEVICE_HW_STATE_ON);
return 0;
}
/**
* ti_sci_cmd_dev_is_trans() - Check if the device is currently transitioning
* @handle: Pointer to TISCI handle
* @id: Device Identifier
* @curr_state: true if currently transitioning.
*
* Return: 0 if all went fine, else return appropriate error.
*/
static int ti_sci_cmd_dev_is_trans(const struct ti_sci_handle *handle, u32 id,
bool *curr_state)
{
int ret;
u8 state;
if (!curr_state)
return -EINVAL;
ret = ti_sci_get_device_state(handle, id, NULL, NULL, NULL, &state);
if (ret)
return ret;
*curr_state = (state == MSG_DEVICE_HW_STATE_TRANS);
return 0;
}
/**
* ti_sci_cmd_set_device_resets() - command to set resets for device managed
* by TISCI
* @handle: Pointer to TISCI handle as retrieved by *ti_sci_get_handle
* @id: Device Identifier
* @reset_state: Device specific reset bit field
*
* Return: 0 if all went fine, else return appropriate error.
*/
static int ti_sci_cmd_set_device_resets(const struct ti_sci_handle *handle,
u32 id, u32 reset_state)
{
struct ti_sci_info *info;
struct ti_sci_msg_req_set_device_resets *req;
struct ti_sci_msg_hdr *resp;
struct ti_sci_xfer *xfer;
struct device *dev;
int ret = 0;
if (IS_ERR(handle))
return PTR_ERR(handle);
if (!handle)
return -EINVAL;
info = handle_to_ti_sci_info(handle);
dev = info->dev;
xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_SET_DEVICE_RESETS,
TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
sizeof(*req), sizeof(*resp));
if (IS_ERR(xfer)) {
ret = PTR_ERR(xfer);
dev_err(dev, "Message alloc failed(%d)\n", ret);
return ret;
}
req = (struct ti_sci_msg_req_set_device_resets *)xfer->xfer_buf;
req->id = id;
req->resets = reset_state;
ret = ti_sci_do_xfer(info, xfer);
if (ret) {
dev_err(dev, "Mbox send fail %d\n", ret);
goto fail;
}
resp = (struct ti_sci_msg_hdr *)xfer->xfer_buf;
ret = ti_sci_is_response_ack(resp) ? 0 : -ENODEV;
fail:
ti_sci_put_one_xfer(&info->minfo, xfer);
return ret;
}
/**
* ti_sci_cmd_get_device_resets() - Get reset state for device managed
* by TISCI
* @handle: Pointer to TISCI handle
* @id: Device Identifier
* @reset_state: Pointer to reset state to populate
*
* Return: 0 if all went fine, else return appropriate error.
*/
static int ti_sci_cmd_get_device_resets(const struct ti_sci_handle *handle,
u32 id, u32 *reset_state)
{
return ti_sci_get_device_state(handle, id, NULL, reset_state, NULL,
NULL);
}
/**
* ti_sci_set_clock_state() - Set clock state helper
* @handle: pointer to TI SCI handle
* @dev_id: Device identifier this request is for
* @clk_id: Clock identifier for the device for this request.
* Each device has it's own set of clock inputs. This indexes
* which clock input to modify.
* @flags: Header flags as needed
* @state: State to request for the clock.
*
* Return: 0 if all went well, else returns appropriate error value.
*/
static int ti_sci_set_clock_state(const struct ti_sci_handle *handle,
u32 dev_id, u32 clk_id,
u32 flags, u8 state)
{
struct ti_sci_info *info;
struct ti_sci_msg_req_set_clock_state *req;
struct ti_sci_msg_hdr *resp;
struct ti_sci_xfer *xfer;
struct device *dev;
int ret = 0;
if (IS_ERR(handle))
return PTR_ERR(handle);
if (!handle)
return -EINVAL;
info = handle_to_ti_sci_info(handle);
dev = info->dev;
xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_SET_CLOCK_STATE,
flags | TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
sizeof(*req), sizeof(*resp));
if (IS_ERR(xfer)) {
ret = PTR_ERR(xfer);
dev_err(dev, "Message alloc failed(%d)\n", ret);
return ret;
}
req = (struct ti_sci_msg_req_set_clock_state *)xfer->xfer_buf;
req->dev_id = dev_id;
if (clk_id < 255) {
req->clk_id = clk_id;
} else {
req->clk_id = 255;
req->clk_id_32 = clk_id;
}
req->request_state = state;
ret = ti_sci_do_xfer(info, xfer);
if (ret) {
dev_err(dev, "Mbox send fail %d\n", ret);
goto fail;
}
resp = (struct ti_sci_msg_hdr *)xfer->xfer_buf;
ret = ti_sci_is_response_ack(resp) ? 0 : -ENODEV;
fail:
ti_sci_put_one_xfer(&info->minfo, xfer);
return ret;
}