summaryrefslogtreecommitdiffstats
path: root/drivers/firmware/ti_sci.c
blob: 69ed1464175c058cfdeda0eb47faf470914477bc (plain)
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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
// SPDX-License-Identifier: GPL-2.0
/*
 * Texas Instruments System Control Interface Protocol Driver
 *
 * Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/
 *	Nishanth Menon
 */

#define pr_fmt(fmt) "%s: " fmt, __func__

#include <linux/bitmap.h>
#include <linux/debugfs.h>
#include <linux/export.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/mailbox_client.h>
#include <linux/module.h>
#include <linux/of_device.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/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
 * @nb:	Reboot Notifier block
 * @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
 * @users:	Number of users of this instance
 */
struct ti_sci_info {
	struct device *dev;
	struct notifier_block nb;
	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;
	/* 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)
#define reboot_to_ti_sci_info(n) container_of(n, struct ti_sci_info, nb)

#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;
}

/**
 * ti_sci_debug_open() - debug file open
 * @inode:	inode pointer
 * @file:	file pointer
 *
 * Return: result of single_open
 */
static int ti_sci_debug_open(struct inode *inode, struct file *file)
{
	return single_open(file, ti_sci_debug_show, inode->i_private);
}

/* log file operations */
static const struct file_operations ti_sci_debug_fops = {
	.open = ti_sci_debug_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

/**
 * 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] = "ti_sci_debug@";

	/* 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;

	info->d = debugfs_create_file(strncat(debug_name, dev_name(dev),
					      sizeof(debug_name) -
					      sizeof("ti_sci_debug@")),
				      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;
}

/**
 * ti_sci_debugfs_destroy() - clean up log debug file
 * @pdev:	platform device pointer
 * @info:	Pointer to SCI entity information
 */
static void ti_sci_debugfs_destroy(struct platform_device *pdev,
				   struct ti_sci_info *info)
{
	if (IS_ERR(info->debug_region))
		return;

	debugfs_remove(info->d);
}
#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->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;

	ret = mbox_send_message(info->chan_tx, &xfer->tx_message);
	if (ret < 0)
		return ret;

	ret = 0;

	/* And we wait for the response. */
	timeout = msecs_to_jiffies(info->desc->max_rx_timeout_ms);
	if (!wait_for_completion_timeout(&xfer->done, timeout)) {
		dev_err(dev, "Mbox timedout in resp(caller: %pS)\n",
			(void *)_RET_IP_);
		ret = -ETIMEDOUT;
	}
	/*
	 * 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;

	/* No need to setup flags since it is expected to respond */
	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_VERSION,
				   0x0, 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;
	strncpy(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;

	/* Response is expected, so need of any flags */
	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_GET_DEVICE_STATE,
				   0, 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
 * @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.
 *
 * NOTE: The request is for exclusive access for the processor.
 *
 * 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,
				       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,
				       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, u8 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;
	req->clk_id = 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;
}

/**
 * ti_sci_cmd_get_clock_state() - Get 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.
 * @programmed_state:	State requested for clock to move to
 * @current_state:	State that the clock is currently in
 *
 * Return: 0 if all went well, else returns appropriate error value.
 */
static int ti_sci_cmd_get_clock_state(const struct ti_sci_handle *handle,
				      u32 dev_id, u8 clk_id,
				      u8 *programmed_state, u8 *current_state)
{
	struct ti_sci_info *info;
	struct ti_sci_msg_req_get_clock_state *req;
	struct ti_sci_msg_resp_get_clock_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 (!programmed_state && !current_state)
		return -EINVAL;

	info = handle_to_ti_sci_info(handle);
	dev = info->dev;

	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_GET_CLOCK_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_clock_state *)xfer->xfer_buf;
	req->dev_id = dev_id;
	req->clk_id = clk_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_clock_state *)xfer->xfer_buf;

	if (!ti_sci_is_response_ack(resp)) {
		ret = -ENODEV;
		goto fail;
	}

	if (programmed_state)
		*programmed_state = resp->programmed_state;
	if (current_state)
		*current_state = resp->current_state;

fail:
	ti_sci_put_one_xfer(&info->minfo, xfer);

	return ret;
}

/**
 * ti_sci_cmd_get_clock() - Get control of a clock from TI SCI
 * @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.
 * @needs_ssc: 'true' if Spread Spectrum clock is desired, else 'false'
 * @can_change_freq: 'true' if frequency change is desired, else 'false'
 * @enable_input_term: 'true' if input termination is desired, else 'false'
 *
 * Return: 0 if all went well, else returns appropriate error value.
 */
static int ti_sci_cmd_get_clock(const struct ti_sci_handle *handle, u32 dev_id,
				u8 clk_id, bool needs_ssc, bool can_change_freq,
				bool enable_input_term)
{
	u32 flags = 0;

	flags |= needs_ssc ? MSG_FLAG_CLOCK_ALLOW_SSC : 0;
	flags |= can_change_freq ? MSG_FLAG_CLOCK_ALLOW_FREQ_CHANGE : 0;
	flags |= enable_input_term ? MSG_FLAG_CLOCK_INPUT_TERM : 0;

	return ti_sci_set_clock_state(handle, dev_id, clk_id, flags,
				      MSG_CLOCK_SW_STATE_REQ);
}

/**
 * ti_sci_cmd_idle_clock() - Idle a clock which is in our control
 * @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.
 *
 * NOTE: This clock must have been requested by get_clock previously.
 *
 * Return: 0 if all went well, else returns appropriate error value.
 */
static int ti_sci_cmd_idle_clock(const struct ti_sci_handle *handle,
				 u32 dev_id, u8 clk_id)
{
	return ti_sci_set_clock_state(handle, dev_id, clk_id, 0,
				      MSG_CLOCK_SW_STATE_UNREQ);
}

/**
 * ti_sci_cmd_put_clock() - Release a clock from our control back to TISCI
 * @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.
 *
 * NOTE: This clock must have been requested by get_clock previously.
 *
 * Return: 0 if all went well, else returns appropriate error value.
 */
static int ti_sci_cmd_put_clock(const struct ti_sci_handle *handle,
				u32 dev_id, u8 clk_id)
{
	return ti_sci_set_clock_state(handle, dev_id, clk_id, 0,
				      MSG_CLOCK_SW_STATE_AUTO);
}

/**
 * ti_sci_cmd_clk_is_auto() - Is the clock being auto managed
 * @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.
 * @req_state: state indicating if the clock is auto managed
 *
 * Return: 0 if all went well, else returns appropriate error value.
 */
static int ti_sci_cmd_clk_is_auto(const struct ti_sci_handle *handle,
				  u32 dev_id, u8 clk_id, bool *req_state)
{
	u8 state = 0;
	int ret;

	if (!req_state)
		return -EINVAL;

	ret = ti_sci_cmd_get_clock_state(handle, dev_id, clk_id, &state, NULL);
	if (ret)
		return ret;

	*req_state = (state == MSG_CLOCK_SW_STATE_AUTO);
	return 0;
}

/**
 * ti_sci_cmd_clk_is_on() - Is the clock ON
 * @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.
 * @req_state: state indicating if the clock is managed by us and enabled
 * @curr_state: state indicating if the clock is ready for operation
 *
 * Return: 0 if all went well, else returns appropriate error value.
 */
static int ti_sci_cmd_clk_is_on(const struct ti_sci_handle *handle, u32 dev_id,
				u8 clk_id, bool *req_state, bool *curr_state)
{
	u8 c_state = 0, r_state = 0;
	int ret;

	if (!req_state && !curr_state)
		return -EINVAL;

	ret = ti_sci_cmd_get_clock_state(handle, dev_id, clk_id,
					 &r_state, &c_state);
	if (ret)
		return ret;

	if (req_state)
		*req_state = (r_state == MSG_CLOCK_SW_STATE_REQ);
	if (curr_state)
		*curr_state = (c_state == MSG_CLOCK_HW_STATE_READY);
	return 0;
}

/**
 * ti_sci_cmd_clk_is_off() - Is the clock OFF
 * @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.
 * @req_state: state indicating if the clock is managed by us and disabled
 * @curr_state: state indicating if the clock is NOT ready for operation
 *
 * Return: 0 if all went well, else returns appropriate error value.
 */
static int ti_sci_cmd_clk_is_off(const struct ti_sci_handle *handle, u32 dev_id,
				 u8 clk_id, bool *req_state, bool *curr_state)
{
	u8 c_state = 0, r_state = 0;
	int ret;

	if (!req_state && !curr_state)
		return -EINVAL;

	ret = ti_sci_cmd_get_clock_state(handle, dev_id, clk_id,
					 &r_state, &c_state);
	if (ret)
		return ret;

	if (req_state)
		*req_state = (r_state == MSG_CLOCK_SW_STATE_UNREQ);
	if (curr_state)
		*curr_state = (c_state == MSG_CLOCK_HW_STATE_NOT_READY);
	return 0;
}

/**
 * ti_sci_cmd_clk_set_parent() - Set the clock source of a specific device clock
 * @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.
 * @parent_id:	Parent clock identifier to set
 *
 * Return: 0 if all went well, else returns appropriate error value.
 */
static int ti_sci_cmd_clk_set_parent(const struct ti_sci_handle *handle,
				     u32 dev_id, u8 clk_id, u8 parent_id)
{
	struct ti_sci_info *info;
	struct ti_sci_msg_req_set_clock_parent *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_PARENT,
				   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_parent *)xfer->xfer_buf;
	req->dev_id = dev_id;
	req->clk_id = clk_id;
	req->parent_id = parent_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_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_clk_get_parent() - Get current parent clock source
 * @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.
 * @parent_id:	Current clock parent
 *
 * Return: 0 if all went well, else returns appropriate error value.
 */
static int ti_sci_cmd_clk_get_parent(const struct ti_sci_handle *handle,
				     u32 dev_id, u8 clk_id, u8 *parent_id)
{
	struct ti_sci_info *info;
	struct ti_sci_msg_req_get_clock_parent *req;
	struct ti_sci_msg_resp_get_clock_parent *resp;
	struct ti_sci_xfer *xfer;
	struct device *dev;
	int ret = 0;

	if (IS_ERR(handle))
		return PTR_ERR(handle);
	if (!handle || !parent_id)
		return -EINVAL;

	info = handle_to_ti_sci_info(handle);
	dev = info->dev;

	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_GET_CLOCK_PARENT,
				   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_clock_parent *)xfer->xfer_buf;
	req->dev_id = dev_id;
	req->clk_id = clk_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_clock_parent *)xfer->xfer_buf;

	if (!ti_sci_is_response_ack(resp))
		ret = -ENODEV;
	else
		*parent_id = resp->parent_id;

fail:
	ti_sci_put_one_xfer(&info->minfo, xfer);

	return ret;
}

/**
 * ti_sci_cmd_clk_get_num_parents() - Get num parents of the current clk source
 * @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.
 * @num_parents: Returns he number of parents to the current clock.
 *
 * Return: 0 if all went well, else returns appropriate error value.
 */
static int ti_sci_cmd_clk_get_num_parents(const struct ti_sci_handle *handle,
					  u32 dev_id, u8 clk_id,
					  u8 *num_parents)
{
	struct ti_sci_info *info;
	struct ti_sci_msg_req_get_clock_num_parents *req;
	struct ti_sci_msg_resp_get_clock_num_parents *resp;
	struct ti_sci_xfer *xfer;
	struct device *dev;
	int ret = 0;

	if (IS_ERR(handle))
		return PTR_ERR(handle);
	if (!handle || !num_parents)
		return -EINVAL;

	info = handle_to_ti_sci_info(handle);
	dev = info->dev;

	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_GET_NUM_CLOCK_PARENTS,
				   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_clock_num_parents *)xfer->xfer_buf;
	req->dev_id = dev_id;
	req->clk_id = clk_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_clock_num_parents *)xfer->xfer_buf;

	if (!ti_sci_is_response_ack(resp))
		ret = -ENODEV;
	else
		*num_parents = resp->num_parents;

fail:
	ti_sci_put_one_xfer(&info->minfo, xfer);

	return ret;
}

/**
 * ti_sci_cmd_clk_get_match_freq() - Find a good match for frequency
 * @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.
 * @min_freq:	The minimum allowable frequency in Hz. This is the minimum
 *		allowable programmed frequency and does not account for clock
 *		tolerances and jitter.
 * @target_freq: The target clock frequency in Hz. A frequency will be
 *		processed as close to this target frequency as possible.
 * @max_freq:	The maximum allowable frequency in Hz. This is the maximum
 *		allowable programmed frequency and does not account for clock
 *		tolerances and jitter.
 * @match_freq:	Frequency match in Hz response.
 *
 * Return: 0 if all went well, else returns appropriate error value.
 */
static int ti_sci_cmd_clk_get_match_freq(const struct ti_sci_handle *handle,
					 u32 dev_id, u8 clk_id, u64 min_freq,
					 u64 target_freq, u64 max_freq,
					 u64 *match_freq)
{
	struct ti_sci_info *info;
	struct ti_sci_msg_req_query_clock_freq *req;
	struct ti_sci_msg_resp_query_clock_freq *resp;
	struct ti_sci_xfer *xfer;
	struct device *dev;
	int ret = 0;

	if (IS_ERR(handle))
		return PTR_ERR(handle);
	if (!handle || !match_freq)
		return -EINVAL;

	info = handle_to_ti_sci_info(handle);
	dev = info->dev;

	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_QUERY_CLOCK_FREQ,
				   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_query_clock_freq *)xfer->xfer_buf;
	req->dev_id = dev_id;
	req->clk_id = clk_id;
	req->min_freq_hz = min_freq;
	req->target_freq_hz = target_freq;
	req->max_freq_hz = max_freq;

	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_query_clock_freq *)xfer->xfer_buf;

	if (!ti_sci_is_response_ack(resp))
		ret = -ENODEV;
	else
		*match_freq = resp->freq_hz;

fail:
	ti_sci_put_one_xfer(&info->minfo, xfer);

	return ret;
}

/**
 * ti_sci_cmd_clk_set_freq() - Set a frequency for clock
 * @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.
 * @min_freq:	The minimum allowable frequency in Hz. This is the minimum
 *		allowable programmed frequency and does not account for clock
 *		tolerances and jitter.
 * @target_freq: The target clock frequency in Hz. A frequency will be
 *		processed as close to this target frequency as possible.
 * @max_freq:	The maximum allowable frequency in Hz. This is the maximum
 *		allowable programmed frequency and does not account for clock
 *		tolerances and jitter.
 *
 * Return: 0 if all went well, else returns appropriate error value.
 */
static int ti_sci_cmd_clk_set_freq(const struct ti_sci_handle *handle,
				   u32 dev_id, u8 clk_id, u64 min_freq,
				   u64 target_freq, u64 max_freq)
{
	struct ti_sci_info *info;
	struct ti_sci_msg_req_set_clock_freq *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_FREQ,
				   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_freq *)xfer->xfer_buf;
	req->dev_id = dev_id;
	req->clk_id = clk_id;
	req->min_freq_hz = min_freq;
	req->target_freq_hz = target_freq;
	req->max_freq_hz = max_freq;

	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_clk_get_freq() - Get current frequency
 * @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.
 * @freq:	Currently frequency in Hz
 *
 * Return: 0 if all went well, else returns appropriate error value.
 */
static int ti_sci_cmd_clk_get_freq(const struct ti_sci_handle *handle,
				   u32 dev_id, u8 clk_id, u64 *freq)
{
	struct ti_sci_info *info;
	struct ti_sci_msg_req_get_clock_freq *req;
	struct ti_sci_msg_resp_get_clock_freq *resp;
	struct ti_sci_xfer *xfer;
	struct device *dev;
	int ret = 0;

	if (IS_ERR(handle))
		return PTR_ERR(handle);
	if (!handle || !freq)
		return -EINVAL;

	info = handle_to_ti_sci_info(handle);
	dev = info->dev;

	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_GET_CLOCK_FREQ,
				   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_clock_freq *)xfer->xfer_buf;
	req->dev_id = dev_id;
	req->clk_id = clk_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_clock_freq *)xfer->xfer_buf;

	if (!ti_sci_is_response_ack(resp))
		ret = -ENODEV;
	else
		*freq = resp->freq_hz;

fail:
	ti_sci_put_one_xfer(&info->minfo, xfer);

	return ret;
}

static int ti_sci_cmd_core_reboot(const struct ti_sci_handle *handle)
{
	struct ti_sci_info *info;
	struct ti_sci_msg_req_reboot *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_SYS_RESET,
				   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_reboot *)xfer->xfer_buf;

	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;

	if (!ti_sci_is_response_ack(resp))
		ret = -ENODEV;
	else
		ret = 0;

fail:
	ti_sci_put_one_xfer(&info->minfo, xfer);

	return ret;
}

/*
 * ti_sci_setup_ops() - Setup the operations structures
 * @info:	pointer to TISCI pointer
 */
static void ti_sci_setup_ops(struct ti_sci_info *info)
{
	struct ti_sci_ops *ops = &info->handle.ops;
	struct ti_sci_core_ops *core_ops = &ops->core_ops;
	struct ti_sci_dev_ops *dops = &ops->dev_ops;
	struct ti_sci_clk_ops *cops = &ops->clk_ops;

	core_ops->reboot_device = ti_sci_cmd_core_reboot;

	dops->get_device = ti_sci_cmd_get_device;
	dops->idle_device = ti_sci_cmd_idle_device;
	dops->put_device = ti_sci_cmd_put_device;

	dops->is_valid = ti_sci_cmd_dev_is_valid;
	dops->get_context_loss_count = ti_sci_cmd_dev_get_clcnt;
	dops->is_idle = ti_sci_cmd_dev_is_idle;
	dops->is_stop = ti_sci_cmd_dev_is_stop;
	dops->is_on = ti_sci_cmd_dev_is_on;
	dops->is_transitioning = ti_sci_cmd_dev_is_trans;
	dops->set_device_resets = ti_sci_cmd_set_device_resets;
	dops->get_device_resets = ti_sci_cmd_get_device_resets;

	cops->get_clock = ti_sci_cmd_get_clock;
	cops->idle_clock = ti_sci_cmd_idle_clock;
	cops->put_clock = ti_sci_cmd_put_clock;
	cops->is_auto = ti_sci_cmd_clk_is_auto;
	cops->is_on = ti_sci_cmd_clk_is_on;
	cops->is_off = ti_sci_cmd_clk_is_off;

	cops->set_parent = ti_sci_cmd_clk_set_parent;
	cops->get_parent = ti_sci_cmd_clk_get_parent;
	cops->get_num_parents = ti_sci_cmd_clk_get_num_parents;

	cops->get_best_match_freq = ti_sci_cmd_clk_get_match_freq;
	cops->set_freq = ti_sci_cmd_clk_set_freq;
	cops->get_freq = ti_sci_cmd_clk_get_freq;
}

/**
 * ti_sci_get_handle() - Get the TI SCI handle for a device
 * @dev:	Pointer to device for which we want SCI handle
 *
 * NOTE: The function does not track individual clients of the framework
 * and is expected to be maintained by caller of TI SCI protocol library.
 * ti_sci_put_handle must be balanced with successful ti_sci_get_handle
 * Return: pointer to handle if successful, else:
 * -EPROBE_DEFER if the instance is not ready
 * -ENODEV if the required node handler is missing
 * -EINVAL if invalid conditions are encountered.
 */
const struct ti_sci_handle *ti_sci_get_handle(struct device *dev)
{
	struct device_node *ti_sci_np;
	struct list_head *p;
	struct ti_sci_handle *handle = NULL;
	struct ti_sci_info *info;

	if (!dev) {
		pr_err("I need a device pointer\n");
		return ERR_PTR(-EINVAL);
	}
	ti_sci_np = of_get_parent(dev->of_node);
	if (!ti_sci_np) {
		dev_err(dev, "No OF information\n");
		return ERR_PTR(-EINVAL);
	}

	mutex_lock(&ti_sci_list_mutex);
	list_for_each(p, &ti_sci_list) {
		info = list_entry(p, struct ti_sci_info, node);
		if (ti_sci_np == info->dev->of_node) {
			handle = &info->handle;
			info->users++;
			break;
		}
	}
	mutex_unlock(&ti_sci_list_mutex);
	of_node_put(ti_sci_np);

	if (!handle)
		return ERR_PTR(-EPROBE_DEFER);

	return handle;
}
EXPORT_SYMBOL_GPL(ti_sci_get_handle);

/**
 * ti_sci_put_handle() - Release the handle acquired by ti_sci_get_handle
 * @handle:	Handle acquired by ti_sci_get_handle
 *
 * NOTE: The function does not track individual clients of the framework
 * and is expected to be maintained by caller of TI SCI protocol library.
 * ti_sci_put_handle must be balanced with successful ti_sci_get_handle
 *
 * Return: 0 is successfully released
 * if an error pointer was passed, it returns the error value back,
 * if null was passed, it returns -EINVAL;
 */
int ti_sci_put_handle(const struct ti_sci_handle *handle)
{
	struct ti_sci_info *info;

	if (IS_ERR(handle))
		return PTR_ERR(handle);
	if (!handle)
		return -EINVAL;

	info = handle_to_ti_sci_info(handle);
	mutex_lock(&ti_sci_list_mutex);
	if (!WARN_ON(!info->users))
		info->users--;
	mutex_unlock(&ti_sci_list_mutex);

	return 0;
}
EXPORT_SYMBOL_GPL(ti_sci_put_handle);

static void devm_ti_sci_release(struct device *dev, void *res)
{
	const struct ti_sci_handle **ptr = res;
	const struct ti_sci_handle *handle = *ptr;
	int ret;

	ret = ti_sci_put_handle(handle);
	if (ret)
		dev_err(dev, "failed to put handle %d\n", ret);
}

/**
 * devm_ti_sci_get_handle() - Managed get handle
 * @dev:	device for which we want SCI handle for.
 *
 * NOTE: This releases the handle once the device resources are
 * no longer needed. MUST NOT BE released with ti_sci_put_handle.
 * The function does not track individual clients of the framework
 * and is expected to be maintained by caller of TI SCI protocol library.
 *
 * Return: 0 if all went fine, else corresponding error.
 */
const struct ti_sci_handle *devm_ti_sci_get_handle(struct device *dev)
{
	const struct ti_sci_handle **ptr;
	const struct ti_sci_handle *handle;

	ptr = devres_alloc(devm_ti_sci_release, sizeof(*ptr), GFP_KERNEL);
	if (!ptr)
		return ERR_PTR(-ENOMEM);
	handle = ti_sci_get_handle(dev);

	if (!IS_ERR(handle)) {
		*ptr = handle;
		devres_add(dev, ptr);
	} else {
		devres_free(ptr);
	}

	return handle;
}
EXPORT_SYMBOL_GPL(devm_ti_sci_get_handle);

static int tisci_reboot_handler(struct notifier_block *nb, unsigned long mode,
				void *cmd)
{
	struct ti_sci_info *info = reboot_to_ti_sci_info(nb);
	const struct ti_sci_handle *handle = &info->handle;

	ti_sci_cmd_core_reboot(handle);

	/* call fail OR pass, we should not be here in the first place */
	return NOTIFY_BAD;
}

/* Description for K2G */
static const struct ti_sci_desc ti_sci_pmmc_k2g_desc = {
	.default_host_id = 2,
	/* Conservative duration */
	.max_rx_timeout_ms = 1000,
	/* Limited by MBOX_TX_QUEUE_LEN. K2G can handle upto 128 messages! */
	.max_msgs = 20,
	.max_msg_size = 64,
};

static const struct of_device_id ti_sci_of_match[] = {
	{.compatible = "ti,k2g-sci", .data = &ti_sci_pmmc_k2g_desc},
	{ /* Sentinel */ },
};
MODULE_DEVICE_TABLE(of, ti_sci_of_match);

static int ti_sci_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	const struct of_device_id *of_id;
	const struct ti_sci_desc *desc;
	struct ti_sci_xfer *xfer;
	struct ti_sci_info *info = NULL;
	struct ti_sci_xfers_info *minfo;
	struct mbox_client *cl;
	int ret = -EINVAL;
	int i;
	int reboot = 0;
	u32 h_id;

	of_id = of_match_device(ti_sci_of_match, dev);
	if (!of_id) {
		dev_err(dev, "OF data missing\n");
		return -EINVAL;
	}
	desc = of_id->data;

	info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	info->dev = dev;
	info->desc = desc;
	ret = of_property_read_u32(dev->of_node, "ti,host-id", &h_id);
	/* if the property is not present in DT, use a default from desc */
	if (ret < 0) {
		info->host_id = info->desc->default_host_id;
	} else {
		if (!h_id) {
			dev_warn(dev, "Host ID 0 is reserved for firmware\n");
			info->host_id = info->desc->default_host_id;
		} else {
			info->host_id = h_id;
		}
	}

	reboot = of_property_read_bool(dev->of_node,
				       "ti,system-reboot-controller");
	INIT_LIST_HEAD(&info->node);
	minfo = &info->minfo;

	/*
	 * Pre-allocate messages
	 * NEVER allocate more than what we can indicate in hdr.seq
	 * if we have data description bug, force a fix..
	 */
	if (WARN_ON(desc->max_msgs >=
		    1 << 8 * sizeof(((struct ti_sci_msg_hdr *)0)->seq)))
		return -EINVAL;

	minfo->xfer_block = devm_kcalloc(dev,
					 desc->max_msgs,
					 sizeof(*minfo->xfer_block),
					 GFP_KERNEL);
	if (!minfo->xfer_block)
		return -ENOMEM;

	minfo->xfer_alloc_table = devm_kcalloc(dev,
					       BITS_TO_LONGS(desc->max_msgs),
					       sizeof(unsigned long),
					       GFP_KERNEL);
	if (!minfo->xfer_alloc_table)
		return -ENOMEM;
	bitmap_zero(minfo->xfer_alloc_table, desc->max_msgs);

	/* Pre-initialize the buffer pointer to pre-allocated buffers */
	for (i = 0, xfer = minfo->xfer_block; i < desc->max_msgs; i++, xfer++) {
		xfer->xfer_buf = devm_kcalloc(dev, 1, desc->max_msg_size,
					      GFP_KERNEL);
		if (!xfer->xfer_buf)
			return -ENOMEM;

		xfer->tx_message.buf = xfer->xfer_buf;
		init_completion(&xfer->done);
	}

	ret = ti_sci_debugfs_create(pdev, info);
	if (ret)
		dev_warn(dev, "Failed to create debug file\n");

	platform_set_drvdata(pdev, info);

	cl = &info->cl;
	cl->dev = dev;
	cl->tx_block = false;
	cl->rx_callback = ti_sci_rx_callback;
	cl->knows_txdone = true;

	spin_lock_init(&minfo->xfer_lock);
	sema_init(&minfo->sem_xfer_count, desc->max_msgs);

	info->chan_rx = mbox_request_channel_byname(cl, "rx");
	if (IS_ERR(info->chan_rx)) {
		ret = PTR_ERR(info->chan_rx);
		goto out;
	}

	info->chan_tx = mbox_request_channel_byname(cl, "tx");
	if (IS_ERR(info->chan_tx)) {
		ret = PTR_ERR(info->chan_tx);
		goto out;
	}
	ret = ti_sci_cmd_get_revision(info);
	if (ret) {
		dev_err(dev, "Unable to communicate with TISCI(%d)\n", ret);
		goto out;
	}

	ti_sci_setup_ops(info);

	if (reboot) {
		info->nb.notifier_call = tisci_reboot_handler;
		info->nb.priority = 128;

		ret = register_restart_handler(&info->nb);
		if (ret) {
			dev_err(dev, "reboot registration fail(%d)\n", ret);
			return ret;
		}
	}

	dev_info(dev, "ABI: %d.%d (firmware rev 0x%04x '%s')\n",
		 info->handle.version.abi_major, info->handle.version.abi_minor,
		 info->handle.version.firmware_revision,
		 info->handle.version.firmware_description);

	mutex_lock(&ti_sci_list_mutex);
	list_add_tail(&info->node, &ti_sci_list);
	mutex_unlock(&ti_sci_list_mutex);

	return of_platform_populate(dev->of_node, NULL, NULL, dev);
out:
	if (!IS_ERR(info->chan_tx))
		mbox_free_channel(info->chan_tx);
	if (!IS_ERR(info->chan_rx))
		mbox_free_channel(info->chan_rx);
	debugfs_remove(info->d);
	return ret;
}

static int ti_sci_remove(struct platform_device *pdev)
{
	struct ti_sci_info *info;
	struct device *dev = &pdev->dev;
	int ret = 0;

	of_platform_depopulate(dev);

	info = platform_get_drvdata(pdev);

	if (info->nb.notifier_call)
		unregister_restart_handler(&info->nb);

	mutex_lock(&ti_sci_list_mutex);
	if (info->users)
		ret = -EBUSY;
	else
		list_del(&info->node);
	mutex_unlock(&ti_sci_list_mutex);

	if (!ret) {
		ti_sci_debugfs_destroy(pdev, info);

		/* Safe to free channels since no more users */
		mbox_free_channel(info->chan_tx);
		mbox_free_channel(info->chan_rx);
	}

	return ret;
}

static struct platform_driver ti_sci_driver = {
	.probe = ti_sci_probe,
	.remove = ti_sci_remove,
	.driver = {
		   .name = "ti-sci",
		   .of_match_table = of_match_ptr(ti_sci_of_match),
	},
};
module_platform_driver(ti_sci_driver);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("TI System Control Interface(SCI) driver");
MODULE_AUTHOR("Nishanth Menon");
MODULE_ALIAS("platform:ti-sci");
OpenPOWER on IntegriCloud