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
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Generic OPP Interface
*
* Copyright (C) 2009-2010 Texas Instruments Incorporated.
* Nishanth Menon
* Romit Dasgupta
* Kevin Hilman
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/clk.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/export.h>
#include <linux/pm_domain.h>
#include <linux/regulator/consumer.h>
#include "opp.h"
/*
* The root of the list of all opp-tables. All opp_table structures branch off
* from here, with each opp_table containing the list of opps it supports in
* various states of availability.
*/
LIST_HEAD(opp_tables);
/* Lock to allow exclusive modification to the device and opp lists */
DEFINE_MUTEX(opp_table_lock);
static struct opp_device *_find_opp_dev(const struct device *dev,
struct opp_table *opp_table)
{
struct opp_device *opp_dev;
list_for_each_entry(opp_dev, &opp_table->dev_list, node)
if (opp_dev->dev == dev)
return opp_dev;
return NULL;
}
static struct opp_table *_find_opp_table_unlocked(struct device *dev)
{
struct opp_table *opp_table;
bool found;
list_for_each_entry(opp_table, &opp_tables, node) {
mutex_lock(&opp_table->lock);
found = !!_find_opp_dev(dev, opp_table);
mutex_unlock(&opp_table->lock);
if (found) {
_get_opp_table_kref(opp_table);
return opp_table;
}
}
return ERR_PTR(-ENODEV);
}
/**
* _find_opp_table() - find opp_table struct using device pointer
* @dev: device pointer used to lookup OPP table
*
* Search OPP table for one containing matching device.
*
* Return: pointer to 'struct opp_table' if found, otherwise -ENODEV or
* -EINVAL based on type of error.
*
* The callers must call dev_pm_opp_put_opp_table() after the table is used.
*/
struct opp_table *_find_opp_table(struct device *dev)
{
struct opp_table *opp_table;
if (IS_ERR_OR_NULL(dev)) {
pr_err("%s: Invalid parameters\n", __func__);
return ERR_PTR(-EINVAL);
}
mutex_lock(&opp_table_lock);
opp_table = _find_opp_table_unlocked(dev);
mutex_unlock(&opp_table_lock);
return opp_table;
}
/**
* dev_pm_opp_get_voltage() - Gets the voltage corresponding to an opp
* @opp: opp for which voltage has to be returned for
*
* Return: voltage in micro volt corresponding to the opp, else
* return 0
*
* This is useful only for devices with single power supply.
*/
unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp)
{
if (IS_ERR_OR_NULL(opp)) {
pr_err("%s: Invalid parameters\n", __func__);
return 0;
}
return opp->supplies[0].u_volt;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_get_voltage);
/**
* dev_pm_opp_get_freq() - Gets the frequency corresponding to an available opp
* @opp: opp for which frequency has to be returned for
*
* Return: frequency in hertz corresponding to the opp, else
* return 0
*/
unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp)
{
if (IS_ERR_OR_NULL(opp) || !opp->available) {
pr_err("%s: Invalid parameters\n", __func__);
return 0;
}
return opp->rate;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq);
/**
* dev_pm_opp_get_level() - Gets the level corresponding to an available opp
* @opp: opp for which level value has to be returned for
*
* Return: level read from device tree corresponding to the opp, else
* return 0.
*/
unsigned int dev_pm_opp_get_level(struct dev_pm_opp *opp)
{
if (IS_ERR_OR_NULL(opp) || !opp->available) {
pr_err("%s: Invalid parameters\n", __func__);
return 0;
}
return opp->level;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_get_level);
/**
* dev_pm_opp_is_turbo() - Returns if opp is turbo OPP or not
* @opp: opp for which turbo mode is being verified
*
* Turbo OPPs are not for normal use, and can be enabled (under certain
* conditions) for short duration of times to finish high throughput work
* quickly. Running on them for longer times may overheat the chip.
*
* Return: true if opp is turbo opp, else false.
*/
bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp)
{
if (IS_ERR_OR_NULL(opp) || !opp->available) {
pr_err("%s: Invalid parameters\n", __func__);
return false;
}
return opp->turbo;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_is_turbo);
/**
* dev_pm_opp_get_max_clock_latency() - Get max clock latency in nanoseconds
* @dev: device for which we do this operation
*
* Return: This function returns the max clock latency in nanoseconds.
*/
unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev)
{
struct opp_table *opp_table;
unsigned long clock_latency_ns;
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table))
return 0;
clock_latency_ns = opp_table->clock_latency_ns_max;
dev_pm_opp_put_opp_table(opp_table);
return clock_latency_ns;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency);
/**
* dev_pm_opp_get_max_volt_latency() - Get max voltage latency in nanoseconds
* @dev: device for which we do this operation
*
* Return: This function returns the max voltage latency in nanoseconds.
*/
unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev)
{
struct opp_table *opp_table;
struct dev_pm_opp *opp;
struct regulator *reg;
unsigned long latency_ns = 0;
int ret, i, count;
struct {
unsigned long min;
unsigned long max;
} *uV;
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table))
return 0;
/* Regulator may not be required for the device */
if (!opp_table->regulators)
goto put_opp_table;
count = opp_table->regulator_count;
uV = kmalloc_array(count, sizeof(*uV), GFP_KERNEL);
if (!uV)
goto put_opp_table;
mutex_lock(&opp_table->lock);
for (i = 0; i < count; i++) {
uV[i].min = ~0;
uV[i].max = 0;
list_for_each_entry(opp, &opp_table->opp_list, node) {
if (!opp->available)
continue;
if (opp->supplies[i].u_volt_min < uV[i].min)
uV[i].min = opp->supplies[i].u_volt_min;
if (opp->supplies[i].u_volt_max > uV[i].max)
uV[i].max = opp->supplies[i].u_volt_max;
}
}
mutex_unlock(&opp_table->lock);
/*
* The caller needs to ensure that opp_table (and hence the regulator)
* isn't freed, while we are executing this routine.
*/
for (i = 0; i < count; i++) {
reg = opp_table->regulators[i];
ret = regulator_set_voltage_time(reg, uV[i].min, uV[i].max);
if (ret > 0)
latency_ns += ret * 1000;
}
kfree(uV);
put_opp_table:
dev_pm_opp_put_opp_table(opp_table);
return latency_ns;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_volt_latency);
/**
* dev_pm_opp_get_max_transition_latency() - Get max transition latency in
* nanoseconds
* @dev: device for which we do this operation
*
* Return: This function returns the max transition latency, in nanoseconds, to
* switch from one OPP to other.
*/
unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev)
{
return dev_pm_opp_get_max_volt_latency(dev) +
dev_pm_opp_get_max_clock_latency(dev);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_transition_latency);
/**
* dev_pm_opp_get_suspend_opp_freq() - Get frequency of suspend opp in Hz
* @dev: device for which we do this operation
*
* Return: This function returns the frequency of the OPP marked as suspend_opp
* if one is available, else returns 0;
*/
unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev)
{
struct opp_table *opp_table;
unsigned long freq = 0;
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table))
return 0;
if (opp_table->suspend_opp && opp_table->suspend_opp->available)
freq = dev_pm_opp_get_freq(opp_table->suspend_opp);
dev_pm_opp_put_opp_table(opp_table);
return freq;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_get_suspend_opp_freq);
int _get_opp_count(struct opp_table *opp_table)
{
struct dev_pm_opp *opp;
int count = 0;
mutex_lock(&opp_table->lock);
list_for_each_entry(opp, &opp_table->opp_list, node) {
if (opp->available)
count++;
}
mutex_unlock(&opp_table->lock);
return count;
}
/**
* dev_pm_opp_get_opp_count() - Get number of opps available in the opp table
* @dev: device for which we do this operation
*
* Return: This function returns the number of available opps if there are any,
* else returns 0 if none or the corresponding error value.
*/
int dev_pm_opp_get_opp_count(struct device *dev)
{
struct opp_table *opp_table;
int count;
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) {
count = PTR_ERR(opp_table);
dev_dbg(dev, "%s: OPP table not found (%d)\n",
__func__, count);
return count;
}
count = _get_opp_count(opp_table);
dev_pm_opp_put_opp_table(opp_table);
return count;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_count);
/**
* dev_pm_opp_find_freq_exact() - search for an exact frequency
* @dev: device for which we do this operation
* @freq: frequency to search for
* @available: true/false - match for available opp
*
* Return: Searches for exact match in the opp table and returns pointer to the
* matching opp if found, else returns ERR_PTR in case of error and should
* be handled using IS_ERR. Error return values can be:
* EINVAL: for bad pointer
* ERANGE: no match found for search
* ENODEV: if device not found in list of registered devices
*
* Note: available is a modifier for the search. if available=true, then the
* match is for exact matching frequency and is available in the stored OPP
* table. if false, the match is for exact frequency which is not available.
*
* This provides a mechanism to enable an opp which is not available currently
* or the opposite as well.
*
* The callers are required to call dev_pm_opp_put() for the returned OPP after
* use.
*/
struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
unsigned long freq,
bool available)
{
struct opp_table *opp_table;
struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) {
int r = PTR_ERR(opp_table);
dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r);
return ERR_PTR(r);
}
mutex_lock(&opp_table->lock);
list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
if (temp_opp->available == available &&
temp_opp->rate == freq) {
opp = temp_opp;
/* Increment the reference count of OPP */
dev_pm_opp_get(opp);
break;
}
}
mutex_unlock(&opp_table->lock);
dev_pm_opp_put_opp_table(opp_table);
return opp;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_exact);
/**
* dev_pm_opp_find_level_exact() - search for an exact level
* @dev: device for which we do this operation
* @level: level to search for
*
* Return: Searches for exact match in the opp table and returns pointer to the
* matching opp if found, else returns ERR_PTR in case of error and should
* be handled using IS_ERR. Error return values can be:
* EINVAL: for bad pointer
* ERANGE: no match found for search
* ENODEV: if device not found in list of registered devices
*
* The callers are required to call dev_pm_opp_put() for the returned OPP after
* use.
*/
struct dev_pm_opp *dev_pm_opp_find_level_exact(struct device *dev,
unsigned int level)
{
struct opp_table *opp_table;
struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) {
int r = PTR_ERR(opp_table);
dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r);
return ERR_PTR(r);
}
mutex_lock(&opp_table->lock);
list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
if (temp_opp->level == level) {
opp = temp_opp;
/* Increment the reference count of OPP */
dev_pm_opp_get(opp);
break;
}
}
mutex_unlock(&opp_table->lock);
dev_pm_opp_put_opp_table(opp_table);
return opp;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_find_level_exact);
static noinline struct dev_pm_opp *_find_freq_ceil(struct opp_table *opp_table,
unsigned long *freq)
{
struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
mutex_lock(&opp_table->lock);
list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
if (temp_opp->available && temp_opp->rate >= *freq) {
opp = temp_opp;
*freq = opp->rate;
/* Increment the reference count of OPP */
dev_pm_opp_get(opp);
break;
}
}
mutex_unlock(&opp_table->lock);
return opp;
}
/**
* dev_pm_opp_find_freq_ceil() - Search for an rounded ceil freq
* @dev: device for which we do this operation
* @freq: Start frequency
*
* Search for the matching ceil *available* OPP from a starting freq
* for a device.
*
* Return: matching *opp and refreshes *freq accordingly, else returns
* ERR_PTR in case of error and should be handled using IS_ERR. Error return
* values can be:
* EINVAL: for bad pointer
* ERANGE: no match found for search
* ENODEV: if device not found in list of registered devices
*
* The callers are required to call dev_pm_opp_put() for the returned OPP after
* use.
*/
struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
unsigned long *freq)
{
struct opp_table *opp_table;
struct dev_pm_opp *opp;
if (!dev || !freq) {
dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq);
return ERR_PTR(-EINVAL);
}
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table))
return ERR_CAST(opp_table);
opp = _find_freq_ceil(opp_table, freq);
dev_pm_opp_put_opp_table(opp_table);
return opp;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil);
/**
* dev_pm_opp_find_freq_floor() - Search for a rounded floor freq
* @dev: device for which we do this operation
* @freq: Start frequency
*
* Search for the matching floor *available* OPP from a starting freq
* for a device.
*
* Return: matching *opp and refreshes *freq accordingly, else returns
* ERR_PTR in case of error and should be handled using IS_ERR. Error return
* values can be:
* EINVAL: for bad pointer
* ERANGE: no match found for search
* ENODEV: if device not found in list of registered devices
*
* The callers are required to call dev_pm_opp_put() for the returned OPP after
* use.
*/
struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
unsigned long *freq)
{
struct opp_table *opp_table;
struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
if (!dev || !freq) {
dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq);
return ERR_PTR(-EINVAL);
}
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table))
return ERR_CAST(opp_table);
mutex_lock(&opp_table->lock);
list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
if (temp_opp->available) {
/* go to the next node, before choosing prev */
if (temp_opp->rate > *freq)
break;
else
opp = temp_opp;
}
}
/* Increment the reference count of OPP */
if (!IS_ERR(opp))
dev_pm_opp_get(opp);
mutex_unlock(&opp_table->lock);
dev_pm_opp_put_opp_table(opp_table);
if (!IS_ERR(opp))
*freq = opp->rate;
return opp;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_floor);
/**
* dev_pm_opp_find_freq_ceil_by_volt() - Find OPP with highest frequency for
* target voltage.
* @dev: Device for which we do this operation.
* @u_volt: Target voltage.
*
* Search for OPP with highest (ceil) frequency and has voltage <= u_volt.
*
* Return: matching *opp, else returns ERR_PTR in case of error which should be
* handled using IS_ERR.
*
* Error return values can be:
* EINVAL: bad parameters
*
* The callers are required to call dev_pm_opp_put() for the returned OPP after
* use.
*/
struct dev_pm_opp *dev_pm_opp_find_freq_ceil_by_volt(struct device *dev,
unsigned long u_volt)
{
struct opp_table *opp_table;
struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
if (!dev || !u_volt) {
dev_err(dev, "%s: Invalid argument volt=%lu\n", __func__,
u_volt);
return ERR_PTR(-EINVAL);
}
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table))
return ERR_CAST(opp_table);
mutex_lock(&opp_table->lock);
list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
if (temp_opp->available) {
if (temp_opp->supplies[0].u_volt > u_volt)
break;
opp = temp_opp;
}
}
/* Increment the reference count of OPP */
if (!IS_ERR(opp))
dev_pm_opp_get(opp);
mutex_unlock(&opp_table->lock);
dev_pm_opp_put_opp_table(opp_table);
return opp;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil_by_volt);
static int _set_opp_voltage(struct device *dev, struct regulator *reg,
struct dev_pm_opp_supply *supply)
{
int ret;
/* Regulator not available for device */
if (IS_ERR(reg)) {
dev_dbg(dev, "%s: regulator not available: %ld\n", __func__,
PTR_ERR(reg));
return 0;
}
dev_dbg(dev, "%s: voltages (mV): %lu %lu %lu\n", __func__,
supply->u_volt_min, supply->u_volt, supply->u_volt_max);
ret = regulator_set_voltage_triplet(reg, supply->u_volt_min,
supply->u_volt, supply->u_volt_max);
if (ret)
dev_err(dev, "%s: failed to set voltage (%lu %lu %lu mV): %d\n",
__func__, supply->u_volt_min, supply->u_volt,
supply->u_volt_max, ret);
return ret;
}
static inline int _generic_set_opp_clk_only(struct device *dev, struct clk *clk,
unsigned long freq)
{
int ret;
ret = clk_set_rate(clk, freq);
if (ret) {
dev_err(dev, "%s: failed to set clock rate: %d\n", __func__,
ret);
}
return ret;
}
static int _generic_set_opp_regulator(const struct opp_table *opp_table,
struct device *dev,
unsigned long old_freq,
unsigned long freq,
struct dev_pm_opp_supply *old_supply,
struct dev_pm_opp_supply *new_supply)
{
struct regulator *reg = opp_table->regulators[0];
int ret;
/* This function only supports single regulator per device */
if (WARN_ON(opp_table->regulator_count > 1)) {
dev_err(dev, "multiple regulators are not supported\n");
return -EINVAL;
}
/* Scaling up? Scale voltage before frequency */
if (freq >= old_freq) {
ret = _set_opp_voltage(dev, reg, new_supply);
if (ret)
goto restore_voltage;
}
/* Change frequency */
ret = _generic_set_opp_clk_only(dev, opp_table->clk, freq);
if (ret)
goto restore_voltage;
/* Scaling down? Scale voltage after frequency */
if (freq < old_freq) {
ret = _set_opp_voltage(dev, reg, new_supply);
if (ret)
goto restore_freq;
}
return 0;
restore_freq:
if (_generic_set_opp_clk_only(dev, opp_table->clk, old_freq))
dev_err(dev, "%s: failed to restore old-freq (%lu Hz)\n",
__func__, old_freq);
restore_voltage:
/* This shouldn't harm even if the voltages weren't updated earlier */
if (old_supply)
_set_opp_voltage(dev, reg, old_supply);
return ret;
}
static int _set_opp_custom(const struct opp_table *opp_table,
struct device *dev, unsigned long old_freq,
unsigned long freq,
struct dev_pm_opp_supply *old_supply,
struct dev_pm_opp_supply *new_supply)
{
struct dev_pm_set_opp_data *data;
int size;
data = opp_table->set_opp_data;
data->regulators = opp_table->regulators;
data->regulator_count = opp_table->regulator_count;
data->clk = opp_table->clk;
data->dev = dev;
data->old_opp.rate = old_freq;
size = sizeof(*old_supply) * opp_table->regulator_count;
if (!old_supply)
memset(data->old_opp.supplies, 0, size);
else
memcpy(data->old_opp.supplies, old_supply, size);
data->new_opp.rate = freq;
memcpy(data->new_opp.supplies, new_supply, size);
return opp_table->set_opp(data);
}
/* This is only called for PM domain for now */
static int _set_required_opps(struct device *dev,
struct opp_table *opp_table,
struct dev_pm_opp *opp)
{
struct opp_table **required_opp_tables = opp_table->required_opp_tables;
struct device **genpd_virt_devs = opp_table->genpd_virt_devs;
unsigned int pstate;
int i, ret = 0;
if (!required_opp_tables)
return 0;
/* Single genpd case */
if (!genpd_virt_devs) {
pstate = likely(opp) ? opp->required_opps[0]->pstate : 0;
ret = dev_pm_genpd_set_performance_state(dev, pstate);
if (ret) {
dev_err(dev, "Failed to set performance state of %s: %d (%d)\n",
dev_name(dev), pstate, ret);
}
return ret;
}
/* Multiple genpd case */
/*
* Acquire genpd_virt_dev_lock to make sure we don't use a genpd_dev
* after it is freed from another thread.
*/
mutex_lock(&opp_table->genpd_virt_dev_lock);
for (i = 0; i < opp_table->required_opp_count; i++) {
pstate = likely(opp) ? opp->required_opps[i]->pstate : 0;
if (!genpd_virt_devs[i])
continue;
ret = dev_pm_genpd_set_performance_state(genpd_virt_devs[i], pstate);
if (ret) {
dev_err(dev, "Failed to set performance rate of %s: %d (%d)\n",
dev_name(genpd_virt_devs[i]), pstate, ret);
break;
}
}
mutex_unlock(&opp_table->genpd_virt_dev_lock);
return ret;
}
/**
* dev_pm_opp_set_rate() - Configure new OPP based on frequency
* @dev: device for which we do this operation
* @target_freq: frequency to achieve
*
* This configures the power-supplies to the levels specified by the OPP
* corresponding to the target_freq, and programs the clock to a value <=
* target_freq, as rounded by clk_round_rate(). Device wanting to run at fmax
* provided by the opp, should have already rounded to the target OPP's
* frequency.
*/
int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
{
struct opp_table *opp_table;
unsigned long freq, old_freq, temp_freq;
struct dev_pm_opp *old_opp, *opp;
struct clk *clk;
int ret;
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) {
dev_err(dev, "%s: device opp doesn't exist\n", __func__);
return PTR_ERR(opp_table);
}
if (unlikely(!target_freq)) {
if (opp_table->required_opp_tables) {
ret = _set_required_opps(dev, opp_table, NULL);
} else {
dev_err(dev, "target frequency can't be 0\n");
ret = -EINVAL;
}
goto put_opp_table;
}
clk = opp_table->clk;
if (IS_ERR(clk)) {
dev_err(dev, "%s: No clock available for the device\n",
__func__);
ret = PTR_ERR(clk);
goto put_opp_table;
}
freq = clk_round_rate(clk, target_freq);
if ((long)freq <= 0)
freq = target_freq;
old_freq = clk_get_rate(clk);
/* Return early if nothing to do */
if (old_freq == freq) {
if (!opp_table->required_opp_tables && !opp_table->regulators) {
dev_dbg(dev, "%s: old/new frequencies (%lu Hz) are same, nothing to do\n",
__func__, freq);
ret = 0;
goto put_opp_table;
}
}
temp_freq = old_freq;
old_opp = _find_freq_ceil(opp_table, &temp_freq);
if (IS_ERR(old_opp)) {
dev_err(dev, "%s: failed to find current OPP for freq %lu (%ld)\n",
__func__, old_freq, PTR_ERR(old_opp));
}
temp_freq = freq;
opp = _find_freq_ceil(opp_table, &temp_freq);
if (IS_ERR(opp)) {
ret = PTR_ERR(opp);
dev_err(dev, "%s: failed to find OPP for freq %lu (%d)\n",
__func__, freq, ret);
goto put_old_opp;
}
dev_dbg(dev, "%s: switching OPP: %lu Hz --> %lu Hz\n", __func__,
old_freq, freq);
/* Scaling up? Configure required OPPs before frequency */
if (freq >= old_freq) {
ret = _set_required_opps(dev, opp_table, opp);
if (ret)
goto put_opp;
}
if (opp_table->set_opp) {
ret = _set_opp_custom(opp_table, dev, old_freq, freq,
IS_ERR(old_opp) ? NULL : old_opp->supplies,
opp->supplies);
} else if (opp_table->regulators) {
ret = _generic_set_opp_regulator(opp_table, dev, old_freq, freq,
IS_ERR(old_opp) ? NULL : old_opp->supplies,
opp->supplies);
} else {
/* Only frequency scaling */
ret = _generic_set_opp_clk_only(dev, clk, freq);
}
/* Scaling down? Configure required OPPs after frequency */
if (!ret && freq < old_freq) {
ret = _set_required_opps(dev, opp_table, opp);
if (ret)
dev_err(dev, "Failed to set required opps: %d\n", ret);
}
put_opp:
dev_pm_opp_put(opp);
put_old_opp:
if (!IS_ERR(old_opp))
dev_pm_opp_put(old_opp);
put_opp_table:
dev_pm_opp_put_opp_table(opp_table);
return ret;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_set_rate);
/* OPP-dev Helpers */
static void _remove_opp_dev(struct opp_device *opp_dev,
struct opp_table *opp_table)
{
opp_debug_unregister(opp_dev, opp_table);
list_del(&opp_dev->node);
kfree(opp_dev);
}
static struct opp_device *_add_opp_dev_unlocked(const struct device *dev,
struct opp_table *opp_table)
{
struct opp_device *opp_dev;
opp_dev = kzalloc(sizeof(*opp_dev), GFP_KERNEL);
if (!opp_dev)
return NULL;
/* Initialize opp-dev */
opp_dev->dev = dev;
list_add(&opp_dev->node, &opp_table->dev_list);
/* Create debugfs entries for the opp_table */
opp_debug_register(opp_dev, opp_table);
return opp_dev;
}
struct opp_device *_add_opp_dev(const struct device *dev,
struct opp_table *opp_table)
{
struct opp_device *opp_dev;
mutex_lock(&opp_table->lock);
opp_dev = _add_opp_dev_unlocked(dev, opp_table);
mutex_unlock(&opp_table->lock);
return opp_dev;
}
static struct opp_table *_allocate_opp_table(struct device *dev, int index)
{
struct opp_table *opp_table;
struct opp_device *opp_dev;
int ret;
/*
* Allocate a new OPP table. In the infrequent case where a new
* device is needed to be added, we pay this penalty.
*/
opp_table = kzalloc(sizeof(*opp_table), GFP_KERNEL);
if (!opp_table)
return NULL;
mutex_init(&opp_table->lock);
mutex_init(&opp_table->genpd_virt_dev_lock);
INIT_LIST_HEAD(&opp_table->dev_list);
/* Mark regulator count uninitialized */
opp_table->regulator_count = -1;
opp_dev = _add_opp_dev(dev, opp_table);
if (!opp_dev) {
kfree(opp_table);
return NULL;
}
_of_init_opp_table(opp_table, dev, index);
/* Find clk for the device */
opp_table->clk = clk_get(dev, NULL);
if (IS_ERR(opp_table->clk)) {
ret = PTR_ERR(opp_table->clk);
if (ret != -EPROBE_DEFER)
dev_dbg(dev, "%s: Couldn't find clock: %d\n", __func__,
ret);
}
BLOCKING_INIT_NOTIFIER_HEAD(&opp_table->head);
INIT_LIST_HEAD(&opp_table->opp_list);
kref_init(&opp_table->kref);
/* Secure the device table modification */
list_add(&opp_table->node, &opp_tables);
return opp_table;
}
void _get_opp_table_kref(struct opp_table *opp_table)
{
kref_get(&opp_table->kref);
}
static struct opp_table *_opp_get_opp_table(struct device *dev, int index)
{
struct opp_table *opp_table;
/* Hold our table modification lock here */
mutex_lock(&opp_table_lock);
opp_table = _find_opp_table_unlocked(dev);
if (!IS_ERR(opp_table))
goto unlock;
opp_table = _managed_opp(dev, index);
if (opp_table) {
if (!_add_opp_dev_unlocked(dev, opp_table)) {
dev_pm_opp_put_opp_table(opp_table);
opp_table = NULL;
}
goto unlock;
}
opp_table = _allocate_opp_table(dev, index);
unlock:
mutex_unlock(&opp_table_lock);
return opp_table;
}
struct opp_table *dev_pm_opp_get_opp_table(struct device *dev)
{
return _opp_get_opp_table(dev, 0);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_table);
struct opp_table *dev_pm_opp_get_opp_table_indexed(struct device *dev,
int index)
{
return _opp_get_opp_table(dev, index);
}
static void _opp_table_kref_release(struct kref *kref)
{
struct opp_table *opp_table = container_of(kref, struct opp_table, kref);
struct opp_device *opp_dev, *temp;
/* Drop the lock as soon as we can */
list_del(&opp_table->node);
mutex_unlock(&opp_table_lock);
_of_clear_opp_table(opp_table);
/* Release clk */
if (!IS_ERR(opp_table->clk))
clk_put(opp_table->clk);
WARN_ON(!list_empty(&opp_table->opp_list));
list_for_each_entry_safe(opp_dev, temp, &opp_table->dev_list, node) {
/*
* The OPP table is getting removed, drop the performance state
* constraints.
*/
if (opp_table->genpd_performance_state)
dev_pm_genpd_set_performance_state((struct device *)(opp_dev->dev), 0);
_remove_opp_dev(opp_dev, opp_table);
}
mutex_destroy(&opp_table->genpd_virt_dev_lock);
mutex_destroy(&opp_table->lock);
kfree(opp_table);
}
void dev_pm_opp_put_opp_table(struct opp_table *opp_table)
{
kref_put_mutex(&opp_table->kref, _opp_table_kref_release,
&opp_table_lock);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_put_opp_table);
void _opp_free(struct dev_pm_opp *opp)
{
kfree(opp);
}
static void _opp_kref_release(struct dev_pm_opp *opp,
struct opp_table *opp_table)
{
/*
* Notify the changes in the availability of the operable
* frequency/voltage list.
*/
blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_REMOVE, opp);
_of_opp_free_required_opps(opp_table, opp);
opp_debug_remove_one(opp);
list_del(&opp->node);
kfree(opp);
}
static void _opp_kref_release_unlocked(struct kref *kref)
{
struct dev_pm_opp *opp = container_of(kref, struct dev_pm_opp, kref);
struct opp_table *opp_table = opp->opp_table;
_opp_kref_release(opp, opp_table);
}
static void _opp_kref_release_locked(struct kref *kref)
{
struct dev_pm_opp *opp = container_of(kref, struct dev_pm_opp, kref);
struct opp_table *opp_table = opp->opp_table;
_opp_kref_release(opp, opp_table);
mutex_unlock(&opp_table->lock);
}
void dev_pm_opp_get(struct dev_pm_opp *opp)
{
kref_get(&opp->kref);
}
void dev_pm_opp_put(struct dev_pm_opp *opp)
{
kref_put_mutex(&opp->kref, _opp_kref_release_locked,
&opp->opp_table->lock);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_put);
static void dev_pm_opp_put_unlocked(struct dev_pm_opp *opp)
{
kref_put(&opp->kref, _opp_kref_release_unlocked);
}
/**
* dev_pm_opp_remove() - Remove an OPP from OPP table
* @dev: device for which we do this operation
* @freq: OPP to remove with matching 'freq'
*
* This function removes an opp from the opp table.
*/
void dev_pm_opp_remove(struct device *dev, unsigned long freq)
{
struct dev_pm_opp *opp;
struct opp_table *opp_table;
bool found = false;
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table))
return;
mutex_lock(&opp_table->lock);
list_for_each_entry(opp, &opp_table->opp_list, node) {
if (opp->rate == freq) {
found = true;
break;
}
}
mutex_unlock(&opp_table->lock);
if (found) {
dev_pm_opp_put(opp);
/* Drop the reference taken by dev_pm_opp_add() */
dev_pm_opp_put_opp_table(opp_table);
} else {
dev_warn(dev, "%s: Couldn't find OPP with freq: %lu\n",
__func__, freq);
}
/* Drop the reference taken by _find_opp_table() */
dev_pm_opp_put_opp_table(opp_table);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_remove);
void _opp_remove_all_static(struct opp_table *opp_table)
{
struct dev_pm_opp *opp, *tmp;
mutex_lock(&opp_table->lock);
if (!opp_table->parsed_static_opps || --opp_table->parsed_static_opps)
goto unlock;
list_for_each_entry_safe(opp, tmp, &opp_table->opp_list, node) {
if (!opp->dynamic)
dev_pm_opp_put_unlocked(opp);
}
unlock:
mutex_unlock(&opp_table->lock);
}
/**
* dev_pm_opp_remove_all_dynamic() - Remove all dynamically created OPPs
* @dev: device for which we do this operation
*
* This function removes all dynamically created OPPs from the opp table.
*/
void dev_pm_opp_remove_all_dynamic(struct device *dev)
{
struct opp_table *opp_table;
struct dev_pm_opp *opp, *temp;
int count = 0;
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table))
return;
mutex_lock(&opp_table->lock);
list_for_each_entry_safe(opp, temp, &opp_table->opp_list, node) {
if (opp->dynamic) {
dev_pm_opp_put_unlocked(opp);
count++;
}
}
mutex_unlock(&opp_table->lock);
/* Drop the references taken by dev_pm_opp_add() */
while (count--)
dev_pm_opp_put_opp_table(opp_table);
/* Drop the reference taken by _find_opp_table() */
dev_pm_opp_put_opp_table(opp_table);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_remove_all_dynamic);
struct dev_pm_opp *_opp_allocate(struct opp_table *table)
{
struct dev_pm_opp *opp;
int count, supply_size;
/* Allocate space for at least one supply */
count = table->regulator_count > 0 ? table->regulator_count : 1;
supply_size = sizeof(*opp->supplies) * count;
/* allocate new OPP node and supplies structures */
opp = kzalloc(sizeof(*opp) + supply_size, GFP_KERNEL);
if (!opp)
return NULL;
/* Put the supplies at the end of the OPP structure as an empty array */
opp->supplies = (struct dev_pm_opp_supply *)(opp + 1);
INIT_LIST_HEAD(&opp->node);
return opp;
}
static bool _opp_supported_by_regulators(struct dev_pm_opp *opp,
struct opp_table *opp_table)
{
struct regulator *reg;
int i;
if (!opp_table->regulators)
return true;
for (i = 0; i < opp_table->regulator_count; i++) {
reg = opp_table->regulators[i];
if (!regulator_is_supported_voltage(reg,
opp->supplies[i].u_volt_min,
opp->supplies[i].u_volt_max)) {
pr_warn("%s: OPP minuV: %lu maxuV: %lu, not supported by regulator\n",
__func__, opp->supplies[i].u_volt_min,
opp->supplies[i].u_volt_max);
return false;
}
}
return true;
}
static int _opp_is_duplicate(struct device *dev, struct dev_pm_opp *new_opp,
struct opp_table *opp_table,
struct list_head **head)
{
struct dev_pm_opp *opp;
/*
* Insert new OPP in order of increasing frequency and discard if
* already present.
*
* Need to use &opp_table->opp_list in the condition part of the 'for'
* loop, don't replace it with head otherwise it will become an infinite
* loop.
*/
list_for_each_entry(opp, &opp_table->opp_list, node) {
if (new_opp->rate > opp->rate) {
*head = &opp->node;
continue;
}
if (new_opp->rate < opp->rate)
return 0;
/* Duplicate OPPs */
dev_warn(dev, "%s: duplicate OPPs detected. Existing: freq: %lu, volt: %lu, enabled: %d. New: freq: %lu, volt: %lu, enabled: %d\n",
__func__, opp->rate, opp->supplies[0].u_volt,
opp->available, new_opp->rate,
new_opp->supplies[0].u_volt, new_opp->available);
/* Should we compare voltages for all regulators here ? */
return opp->available &&
new_opp->supplies[0].u_volt == opp->supplies[0].u_volt ? -EBUSY : -EEXIST;
}
return 0;
}
/*
* Returns:
* 0: On success. And appropriate error message for duplicate OPPs.
* -EBUSY: For OPP with same freq/volt and is available. The callers of
* _opp_add() must return 0 if they receive -EBUSY from it. This is to make
* sure we don't print error messages unnecessarily if different parts of
* kernel try to initialize the OPP table.
* -EEXIST: For OPP with same freq but different volt or is unavailable. This
* should be considered an error by the callers of _opp_add().
*/
int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
struct opp_table *opp_table, bool rate_not_available)
{
struct list_head *head;
int ret;
mutex_lock(&opp_table->lock);
head = &opp_table->opp_list;
if (likely(!rate_not_available)) {
ret = _opp_is_duplicate(dev, new_opp, opp_table, &head);
if (ret) {
mutex_unlock(&opp_table->lock);
return ret;
}
}
list_add(&new_opp->node, head);
mutex_unlock(&opp_table->lock);
new_opp->opp_table = opp_table;
kref_init(&new_opp->kref);
opp_debug_create_one(new_opp, opp_table);
if (!_opp_supported_by_regulators(new_opp, opp_table)) {
new_opp->available = false;
dev_warn(dev, "%s: OPP not supported by regulators (%lu)\n",
__func__, new_opp->rate);
}
return 0;
}
/**
* _opp_add_v1() - Allocate a OPP based on v1 bindings.
* @opp_table: OPP table
* @dev: device for which we do this operation
* @freq: Frequency in Hz for this OPP
* @u_volt: Voltage in uVolts for this OPP
* @dynamic: Dynamically added OPPs.
*
* This function adds an opp definition to the opp table and returns status.
* The opp is made available by default and it can be controlled using
* dev_pm_opp_enable/disable functions and may be removed by dev_pm_opp_remove.
*
* NOTE: "dynamic" parameter impacts OPPs added by the dev_pm_opp_of_add_table
* and freed by dev_pm_opp_of_remove_table.
*
* Return:
* 0 On success OR
* Duplicate OPPs (both freq and volt are same) and opp->available
* -EEXIST Freq are same and volt are different OR
* Duplicate OPPs (both freq and volt are same) and !opp->available
* -ENOMEM Memory allocation failure
*/
int _opp_add_v1(struct opp_table *opp_table, struct device *dev,
unsigned long freq, long u_volt, bool dynamic)
{
struct dev_pm_opp *new_opp;
unsigned long tol;
int ret;
new_opp = _opp_allocate(opp_table);
if (!new_opp)
return -ENOMEM;
/* populate the opp table */
new_opp->rate = freq;
tol = u_volt * opp_table->voltage_tolerance_v1 / 100;
new_opp->supplies[0].u_volt = u_volt;
new_opp->supplies[0].u_volt_min = u_volt - tol;
new_opp->supplies[0].u_volt_max = u_volt + tol;
new_opp->available = true;
new_opp->dynamic = dynamic;
ret = _opp_add(dev, new_opp, opp_table, false);
if (ret) {
/* Don't return error for duplicate OPPs */
if (ret == -EBUSY)
ret = 0;
goto free_opp;
}
/*
* Notify the changes in the availability of the operable
* frequency/voltage list.
*/
blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp);
return 0;
free_opp:
_opp_free(new_opp);
return ret;
}
/**
* dev_pm_opp_set_supported_hw() - Set supported platforms
* @dev: Device for which supported-hw has to be set.
* @versions: Array of hierarchy of versions to match.
* @count: Number of elements in the array.
*
* This is required only for the V2 bindings, and it enables a platform to
* specify the hierarchy of versions it supports. OPP layer will then enable
* OPPs, which are available for those versions, based on its 'opp-supported-hw'
* property.
*/
struct opp_table *dev_pm_opp_set_supported_hw(struct device *dev,
const u32 *versions, unsigned int count)
{
struct opp_table *opp_table;
opp_table = dev_pm_opp_get_opp_table(dev);
if (!opp_table)
return ERR_PTR(-ENOMEM);
/* Make sure there are no concurrent readers while updating opp_table */
WARN_ON(!list_empty(&opp_table->opp_list));
/* Another CPU that shares the OPP table has set the property ? */
if (opp_table->supported_hw)
return opp_table;
opp_table->supported_hw = kmemdup(versions, count * sizeof(*versions),
GFP_KERNEL);
if (!opp_table->supported_hw) {
dev_pm_opp_put_opp_table(opp_table);
return ERR_PTR(-ENOMEM);
}
opp_table->supported_hw_count = count;
return opp_table;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_set_supported_hw);
/**
* dev_pm_opp_put_supported_hw() - Releases resources blocked for supported hw
* @opp_table: OPP table returned by dev_pm_opp_set_supported_hw().
*
* This is required only for the V2 bindings, and is called for a matching
* dev_pm_opp_set_supported_hw(). Until this is called, the opp_table structure
* will not be freed.
*/
void dev_pm_opp_put_supported_hw(struct opp_table *opp_table)
{
/* Make sure there are no concurrent readers while updating opp_table */
WARN_ON(!list_empty(&opp_table->opp_list));
kfree(opp_table->supported_hw);
opp_table->supported_hw = NULL;
opp_table->supported_hw_count = 0;
dev_pm_opp_put_opp_table(opp_table);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_put_supported_hw);
/**
* dev_pm_opp_set_prop_name() - Set prop-extn name
* @dev: Device for which the prop-name has to be set.
* @name: name to postfix to properties.
*
* This is required only for the V2 bindings, and it enables a platform to
* specify the extn to be used for certain property names. The properties to
* which the extension will apply are opp-microvolt and opp-microamp. OPP core
* should postfix the property name with -<name> while looking for them.
*/
struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name)
{
struct opp_table *opp_table;
opp_table = dev_pm_opp_get_opp_table(dev);
if (!opp_table)
return ERR_PTR(-ENOMEM);
/* Make sure there are no concurrent readers while updating opp_table */
WARN_ON(!list_empty(&opp_table->opp_list));
/* Another CPU that shares the OPP table has set the property ? */
if (opp_table->prop_name)
return opp_table;
opp_table->prop_name = kstrdup(name, GFP_KERNEL);
if (!opp_table->prop_name) {
dev_pm_opp_put_opp_table(opp_table);
return ERR_PTR(-ENOMEM);
}
return opp_table;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_set_prop_name);
/**
* dev_pm_opp_put_prop_name() - Releases resources blocked for prop-name
* @opp_table: OPP table returned by dev_pm_opp_set_prop_name().
*
* This is required only for the V2 bindings, and is called for a matching
* dev_pm_opp_set_prop_name(). Until this is called, the opp_table structure
* will not be freed.
*/
void dev_pm_opp_put_prop_name(struct opp_table *opp_table)
{
/* Make sure there are no concurrent readers while updating opp_table */
WARN_ON(!list_empty(&opp_table->opp_list));
kfree(opp_table->prop_name);
opp_table->prop_name = NULL;
dev_pm_opp_put_opp_table(opp_table);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_put_prop_name);
static int _allocate_set_opp_data(struct opp_table *opp_table)
{
struct dev_pm_set_opp_data *data;
int len, count = opp_table->regulator_count;
if (WARN_ON(!opp_table->regulators))
return -EINVAL;
/* space for set_opp_data */
len = sizeof(*data);
/* space for old_opp.supplies and new_opp.supplies */
len += 2 * sizeof(struct dev_pm_opp_supply) * count;
data = kzalloc(len, GFP_KERNEL);
if (!data)
return -ENOMEM;
data->old_opp.supplies = (void *)(data + 1);
data->new_opp.supplies = data->old_opp.supplies + count;
opp_table->set_opp_data = data;
return 0;
}
static void _free_set_opp_data(struct opp_table *opp_table)
{
kfree(opp_table->set_opp_data);
opp_table->set_opp_data = NULL;
}
/**
* dev_pm_opp_set_regulators() - Set regulator names for the device
* @dev: Device for which regulator name is being set.
* @names: Array of pointers to the names of the regulator.
* @count: Number of regulators.
*
* In order to support OPP switching, OPP layer needs to know the name of the
* device's regulators, as the core would be required to switch voltages as
* well.
*
* This must be called before any OPPs are initialized for the device.
*/
struct opp_table *dev_pm_opp_set_regulators(struct device *dev,
const char * const names[],
unsigned int count)
{
struct opp_table *opp_table;
struct regulator *reg;
int ret, i;
opp_table = dev_pm_opp_get_opp_table(dev);
if (!opp_table)
return ERR_PTR(-ENOMEM);
/* This should be called before OPPs are initialized */
if (WARN_ON(!list_empty(&opp_table->opp_list))) {
ret = -EBUSY;
goto err;
}
/* Another CPU that shares the OPP table has set the regulators ? */
if (opp_table->regulators)
return opp_table;
opp_table->regulators = kmalloc_array(count,
sizeof(*opp_table->regulators),
GFP_KERNEL);
if (!opp_table->regulators) {
ret = -ENOMEM;
goto err;
}
for (i = 0; i < count; i++) {
reg = regulator_get_optional(dev, names[i]);
if (IS_ERR(reg)) {
ret = PTR_ERR(reg);
if (ret != -EPROBE_DEFER)
dev_err(dev, "%s: no regulator (%s) found: %d\n",
__func__, names[i], ret);
goto free_regulators;
}
opp_table->regulators[i] = reg;
}
opp_table->regulator_count = count;
/* Allocate block only once to pass to set_opp() routines */
ret = _allocate_set_opp_data(opp_table);
if (ret)
goto free_regulators;
return opp_table;
free_regulators:
while (i != 0)
regulator_put(opp_table->regulators[--i]);
kfree(opp_table->regulators);
opp_table->regulators = NULL;
opp_table->regulator_count = -1;
err:
dev_pm_opp_put_opp_table(opp_table);
return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_set_regulators);
/**
* dev_pm_opp_put_regulators() - Releases resources blocked for regulator
* @opp_table: OPP table returned from dev_pm_opp_set_regulators().
*/
void dev_pm_opp_put_regulators(struct opp_table *opp_table)
{
int i;
if (!opp_table->regulators)
goto put_opp_table;
/* Make sure there are no concurrent readers while updating opp_table */
WARN_ON(!list_empty(&opp_table->opp_list));
for (i = opp_table->regulator_count - 1; i >= 0; i--)
regulator_put(opp_table->regulators[i]);
_free_set_opp_data(opp_table);
kfree(opp_table->regulators);
opp_table->regulators = NULL;
opp_table->regulator_count = -1;
put_opp_table:
dev_pm_opp_put_opp_table(opp_table);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_put_regulators);
/**
* dev_pm_opp_set_clkname() - Set clk name for the device
* @dev: Device for which clk name is being set.
* @name: Clk name.
*
* In order to support OPP switching, OPP layer needs to get pointer to the
* clock for the device. Simple cases work fine without using this routine (i.e.
* by passing connection-id as NULL), but for a device with multiple clocks
* available, the OPP core needs to know the exact name of the clk to use.
*
* This must be called before any OPPs are initialized for the device.
*/
struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const char *name)
{
struct opp_table *opp_table;
int ret;
opp_table = dev_pm_opp_get_opp_table(dev);
if (!opp_table)
return ERR_PTR(-ENOMEM);
/* This should be called before OPPs are initialized */
if (WARN_ON(!list_empty(&opp_table->opp_list))) {
ret = -EBUSY;
goto err;
}
/* Already have default clk set, free it */
if (!IS_ERR(opp_table->clk))
clk_put(opp_table->clk);
/* Find clk for the device */
opp_table->clk = clk_get(dev, name);
if (IS_ERR(opp_table->clk)) {
ret = PTR_ERR(opp_table->clk);
if (ret != -EPROBE_DEFER) {
dev_err(dev, "%s: Couldn't find clock: %d\n", __func__,
ret);
}
goto err;
}
return opp_table;
err:
dev_pm_opp_put_opp_table(opp_table);
return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_set_clkname);
/**
* dev_pm_opp_put_clkname() - Releases resources blocked for clk.
* @opp_table: OPP table returned from dev_pm_opp_set_clkname().
*/
void dev_pm_opp_put_clkname(struct opp_table *opp_table)
{
/* Make sure there are no concurrent readers while updating opp_table */
WARN_ON(!list_empty(&opp_table->opp_list));
clk_put(opp_table->clk);
opp_table->clk = ERR_PTR(-EINVAL);
dev_pm_opp_put_opp_table(opp_table);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_put_clkname);
/**
* dev_pm_opp_register_set_opp_helper() - Register custom set OPP helper
* @dev: Device for which the helper is getting registered.
* @set_opp: Custom set OPP helper.
*
* This is useful to support complex platforms (like platforms with multiple
* regulators per device), instead of the generic OPP set rate helper.
*
* This must be called before any OPPs are initialized for the device.
*/
struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev,
int (*set_opp)(struct dev_pm_set_opp_data *data))
{
struct opp_table *opp_table;
if (!set_opp)
return ERR_PTR(-EINVAL);
opp_table = dev_pm_opp_get_opp_table(dev);
if (!opp_table)
return ERR_PTR(-ENOMEM);
/* This should be called before OPPs are initialized */
if (WARN_ON(!list_empty(&opp_table->opp_list))) {
dev_pm_opp_put_opp_table(opp_table);
return ERR_PTR(-EBUSY);
}
/* Another CPU that shares the OPP table has set the helper ? */
if (!opp_table->set_opp)
opp_table->set_opp = set_opp;
return opp_table;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_register_set_opp_helper);
/**
* dev_pm_opp_unregister_set_opp_helper() - Releases resources blocked for
* set_opp helper
* @opp_table: OPP table returned from dev_pm_opp_register_set_opp_helper().
*
* Release resources blocked for platform specific set_opp helper.
*/
void dev_pm_opp_unregister_set_opp_helper(struct opp_table *opp_table)
{
/* Make sure there are no concurrent readers while updating opp_table */
WARN_ON(!list_empty(&opp_table->opp_list));
opp_table->set_opp = NULL;
dev_pm_opp_put_opp_table(opp_table);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_unregister_set_opp_helper);
static void _opp_detach_genpd(struct opp_table *opp_table)
{
int index;
if (!opp_table->genpd_virt_devs)
return;
for (index = 0; index < opp_table->required_opp_count; index++) {
if (!opp_table->genpd_virt_devs[index])
continue;
dev_pm_domain_detach(opp_table->genpd_virt_devs[index], false);
opp_table->genpd_virt_devs[index] = NULL;
}
kfree(opp_table->genpd_virt_devs);
opp_table->genpd_virt_devs = NULL;
}
/**
* dev_pm_opp_attach_genpd - Attach genpd(s) for the device and save virtual device pointer
* @dev: Consumer device for which the genpd is getting attached.
* @names: Null terminated array of pointers containing names of genpd to attach.
* @virt_devs: Pointer to return the array of virtual devices.
*
* Multiple generic power domains for a device are supported with the help of
* virtual genpd devices, which are created for each consumer device - genpd
* pair. These are the device structures which are attached to the power domain
* and are required by the OPP core to set the performance state of the genpd.
* The same API also works for the case where single genpd is available and so
* we don't need to support that separately.
*
* This helper will normally be called by the consumer driver of the device
* "dev", as only that has details of the genpd names.
*
* This helper needs to be called once with a list of all genpd to attach.
* Otherwise the original device structure will be used instead by the OPP core.
*
* The order of entries in the names array must match the order in which
* "required-opps" are added in DT.
*/
struct opp_table *dev_pm_opp_attach_genpd(struct device *dev,
const char **names, struct device ***virt_devs)
{
struct opp_table *opp_table;
struct device *virt_dev;
int index = 0, ret = -EINVAL;
const char **name = names;
opp_table = dev_pm_opp_get_opp_table(dev);
if (!opp_table)
return ERR_PTR(-ENOMEM);
if (opp_table->genpd_virt_devs)
return opp_table;
/*
* If the genpd's OPP table isn't already initialized, parsing of the
* required-opps fail for dev. We should retry this after genpd's OPP
* table is added.
*/
if (!opp_table->required_opp_count) {
ret = -EPROBE_DEFER;
goto put_table;
}
mutex_lock(&opp_table->genpd_virt_dev_lock);
opp_table->genpd_virt_devs = kcalloc(opp_table->required_opp_count,
sizeof(*opp_table->genpd_virt_devs),
GFP_KERNEL);
if (!opp_table->genpd_virt_devs)
goto unlock;
while (*name) {
if (index >= opp_table->required_opp_count) {
dev_err(dev, "Index can't be greater than required-opp-count - 1, %s (%d : %d)\n",
*name, opp_table->required_opp_count, index);
goto err;
}
if (opp_table->genpd_virt_devs[index]) {
dev_err(dev, "Genpd virtual device already set %s\n",
*name);
goto err;
}
virt_dev = dev_pm_domain_attach_by_name(dev, *name);
if (IS_ERR(virt_dev)) {
ret = PTR_ERR(virt_dev);
dev_err(dev, "Couldn't attach to pm_domain: %d\n", ret);
goto err;
}
opp_table->genpd_virt_devs[index] = virt_dev;
index++;
name++;
}
if (virt_devs)
*virt_devs = opp_table->genpd_virt_devs;
mutex_unlock(&opp_table->genpd_virt_dev_lock);
return opp_table;
err:
_opp_detach_genpd(opp_table);
unlock:
mutex_unlock(&opp_table->genpd_virt_dev_lock);
put_table:
dev_pm_opp_put_opp_table(opp_table);
return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_attach_genpd);
/**
* dev_pm_opp_detach_genpd() - Detach genpd(s) from the device.
* @opp_table: OPP table returned by dev_pm_opp_attach_genpd().
*
* This detaches the genpd(s), resets the virtual device pointers, and puts the
* OPP table.
*/
void dev_pm_opp_detach_genpd(struct opp_table *opp_table)
{
/*
* Acquire genpd_virt_dev_lock to make sure virt_dev isn't getting
* used in parallel.
*/
mutex_lock(&opp_table->genpd_virt_dev_lock);
_opp_detach_genpd(opp_table);
mutex_unlock(&opp_table->genpd_virt_dev_lock);
dev_pm_opp_put_opp_table(opp_table);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_detach_genpd);
/**
* dev_pm_opp_xlate_performance_state() - Find required OPP's pstate for src_table.
* @src_table: OPP table which has dst_table as one of its required OPP table.
* @dst_table: Required OPP table of the src_table.
* @pstate: Current performance state of the src_table.
*
* This Returns pstate of the OPP (present in @dst_table) pointed out by the
* "required-opps" property of the OPP (present in @src_table) which has
* performance state set to @pstate.
*
* Return: Zero or positive performance state on success, otherwise negative
* value on errors.
*/
int dev_pm_opp_xlate_performance_state(struct opp_table *src_table,
struct opp_table *dst_table,
unsigned int pstate)
{
struct dev_pm_opp *opp;
int dest_pstate = -EINVAL;
int i;
if (!pstate)
return 0;
/*
* Normally the src_table will have the "required_opps" property set to
* point to one of the OPPs in the dst_table, but in some cases the
* genpd and its master have one to one mapping of performance states
* and so none of them have the "required-opps" property set. Return the
* pstate of the src_table as it is in such cases.
*/
if (!src_table->required_opp_count)
return pstate;
for (i = 0; i < src_table->required_opp_count; i++) {
if (src_table->required_opp_tables[i]->np == dst_table->np)
break;
}
if (unlikely(i == src_table->required_opp_count)) {
pr_err("%s: Couldn't find matching OPP table (%p: %p)\n",
__func__, src_table, dst_table);
return -EINVAL;
}
mutex_lock(&src_table->lock);
list_for_each_entry(opp, &src_table->opp_list, node) {
if (opp->pstate == pstate) {
dest_pstate = opp->required_opps[i]->pstate;
goto unlock;
}
}
pr_err("%s: Couldn't find matching OPP (%p: %p)\n", __func__, src_table,
dst_table);
unlock:
mutex_unlock(&src_table->lock);
return dest_pstate;
}
/**
* dev_pm_opp_add() - Add an OPP table from a table definitions
* @dev: device for which we do this operation
* @freq: Frequency in Hz for this OPP
* @u_volt: Voltage in uVolts for this OPP
*
* This function adds an opp definition to the opp table and returns status.
* The opp is made available by default and it can be controlled using
* dev_pm_opp_enable/disable functions.
*
* Return:
* 0 On success OR
* Duplicate OPPs (both freq and volt are same) and opp->available
* -EEXIST Freq are same and volt are different OR
* Duplicate OPPs (both freq and volt are same) and !opp->available
* -ENOMEM Memory allocation failure
*/
int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt)
{
struct opp_table *opp_table;
int ret;
opp_table = dev_pm_opp_get_opp_table(dev);
if (!opp_table)
return -ENOMEM;
/* Fix regulator count for dynamic OPPs */
opp_table->regulator_count = 1;
ret = _opp_add_v1(opp_table, dev, freq, u_volt, true);
if (ret)
dev_pm_opp_put_opp_table(opp_table);
return ret;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_add);
/**
* _opp_set_availability() - helper to set the availability of an opp
* @dev: device for which we do this operation
* @freq: OPP frequency to modify availability
* @availability_req: availability status requested for this opp
*
* Set the availability of an OPP, opp_{enable,disable} share a common logic
* which is isolated here.
*
* Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
* copy operation, returns 0 if no modification was done OR modification was
* successful.
*/
static int _opp_set_availability(struct device *dev, unsigned long freq,
bool availability_req)
{
struct opp_table *opp_table;
struct dev_pm_opp *tmp_opp, *opp = ERR_PTR(-ENODEV);
int r = 0;
/* Find the opp_table */
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) {
r = PTR_ERR(opp_table);
dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r);
return r;
}
mutex_lock(&opp_table->lock);
/* Do we have the frequency? */
list_for_each_entry(tmp_opp, &opp_table->opp_list, node) {
if (tmp_opp->rate == freq) {
opp = tmp_opp;
break;
}
}
if (IS_ERR(opp)) {
r = PTR_ERR(opp);
goto unlock;
}
/* Is update really needed? */
if (opp->available == availability_req)
goto unlock;
opp->available = availability_req;
dev_pm_opp_get(opp);
mutex_unlock(&opp_table->lock);
/* Notify the change of the OPP availability */
if (availability_req)
blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ENABLE,
opp);
else
blocking_notifier_call_chain(&opp_table->head,
OPP_EVENT_DISABLE, opp);
dev_pm_opp_put(opp);
goto put_table;
unlock:
mutex_unlock(&opp_table->lock);
put_table:
dev_pm_opp_put_opp_table(opp_table);
return r;
}
/**
* dev_pm_opp_enable() - Enable a specific OPP
* @dev: device for which we do this operation
* @freq: OPP frequency to enable
*
* Enables a provided opp. If the operation is valid, this returns 0, else the
* corresponding error value. It is meant to be used for users an OPP available
* after being temporarily made unavailable with dev_pm_opp_disable.
*
* Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
* copy operation, returns 0 if no modification was done OR modification was
* successful.
*/
int dev_pm_opp_enable(struct device *dev, unsigned long freq)
{
return _opp_set_availability(dev, freq, true);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_enable);
/**
* dev_pm_opp_disable() - Disable a specific OPP
* @dev: device for which we do this operation
* @freq: OPP frequency to disable
*
* Disables a provided opp. If the operation is valid, this returns
* 0, else the corresponding error value. It is meant to be a temporary
* control by users to make this OPP not available until the circumstances are
* right to make it available again (with a call to dev_pm_opp_enable).
*
* Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
* copy operation, returns 0 if no modification was done OR modification was
* successful.
*/
int dev_pm_opp_disable(struct device *dev, unsigned long freq)
{
return _opp_set_availability(dev, freq, false);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_disable);
/**
* dev_pm_opp_register_notifier() - Register OPP notifier for the device
* @dev: Device for which notifier needs to be registered
* @nb: Notifier block to be registered
*
* Return: 0 on success or a negative error value.
*/
int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb)
{
struct opp_table *opp_table;
int ret;
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table))
return PTR_ERR(opp_table);
ret = blocking_notifier_chain_register(&opp_table->head, nb);
dev_pm_opp_put_opp_table(opp_table);
return ret;
}
EXPORT_SYMBOL(dev_pm_opp_register_notifier);
/**
* dev_pm_opp_unregister_notifier() - Unregister OPP notifier for the device
* @dev: Device for which notifier needs to be unregistered
* @nb: Notifier block to be unregistered
*
* Return: 0 on success or a negative error value.
*/
int dev_pm_opp_unregister_notifier(struct device *dev,
struct notifier_block *nb)
{
struct opp_table *opp_table;
int ret;
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table))
return PTR_ERR(opp_table);
ret = blocking_notifier_chain_unregister(&opp_table->head, nb);
dev_pm_opp_put_opp_table(opp_table);
return ret;
}
EXPORT_SYMBOL(dev_pm_opp_unregister_notifier);
void _dev_pm_opp_find_and_remove_table(struct device *dev)
{
struct opp_table *opp_table;
/* Check for existing table for 'dev' */
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) {
int error = PTR_ERR(opp_table);
if (error != -ENODEV)
WARN(1, "%s: opp_table: %d\n",
IS_ERR_OR_NULL(dev) ?
"Invalid device" : dev_name(dev),
error);
return;
}
_opp_remove_all_static(opp_table);
/* Drop reference taken by _find_opp_table() */
dev_pm_opp_put_opp_table(opp_table);
/* Drop reference taken while the OPP table was added */
dev_pm_opp_put_opp_table(opp_table);
}
/**
* dev_pm_opp_remove_table() - Free all OPPs associated with the device
* @dev: device pointer used to lookup OPP table.
*
* Free both OPPs created using static entries present in DT and the
* dynamically added entries.
*/
void dev_pm_opp_remove_table(struct device *dev)
{
_dev_pm_opp_find_and_remove_table(dev);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_remove_table);
|