summaryrefslogtreecommitdiff
path: root/drivers/media/platform/omap3isp/isp.c
blob: 1d7dbd5c0fbab03a88f63e74d9bfe0217d695c06 (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
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
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
/*
 * isp.c
 *
 * TI OMAP3 ISP - Core
 *
 * Copyright (C) 2006-2010 Nokia Corporation
 * Copyright (C) 2007-2009 Texas Instruments, Inc.
 *
 * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
 *	     Sakari Ailus <sakari.ailus@iki.fi>
 *
 * Contributors:
 *	Laurent Pinchart <laurent.pinchart@ideasonboard.com>
 *	Sakari Ailus <sakari.ailus@iki.fi>
 *	David Cohen <dacohen@gmail.com>
 *	Stanimir Varbanov <svarbanov@mm-sol.com>
 *	Vimarsh Zutshi <vimarsh.zutshi@gmail.com>
 *	Tuukka Toivonen <tuukkat76@gmail.com>
 *	Sergio Aguirre <saaguirre@ti.com>
 *	Antti Koskipaa <akoskipa@gmail.com>
 *	Ivan T. Ivanov <iivanov@mm-sol.com>
 *	RaniSuneela <r-m@ti.com>
 *	Atanas Filipov <afilipov@mm-sol.com>
 *	Gjorgji Rosikopulos <grosikopulos@mm-sol.com>
 *	Hiroshi DOYU <hiroshi.doyu@nokia.com>
 *	Nayden Kanchev <nkanchev@mm-sol.com>
 *	Phil Carmody <ext-phil.2.carmody@nokia.com>
 *	Artem Bityutskiy <artem.bityutskiy@nokia.com>
 *	Dominic Curran <dcurran@ti.com>
 *	Ilkka Myllyperkio <ilkka.myllyperkio@sofica.fi>
 *	Pallavi Kulkarni <p-kulkarni@ti.com>
 *	Vaibhav Hiremath <hvaibhav@ti.com>
 *	Mohit Jalori <mjalori@ti.com>
 *	Sameer Venkatraman <sameerv@ti.com>
 *	Senthilvadivu Guruswamy <svadivu@ti.com>
 *	Thara Gopinath <thara@ti.com>
 *	Toni Leinonen <toni.leinonen@nokia.com>
 *	Troy Laramy <t-laramy@ti.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 */

#include <asm/cacheflush.h>

#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/omap-iommu.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/vmalloc.h>

#include <media/v4l2-common.h>
#include <media/v4l2-device.h>

#include "isp.h"
#include "ispreg.h"
#include "ispccdc.h"
#include "isppreview.h"
#include "ispresizer.h"
#include "ispcsi2.h"
#include "ispccp2.h"
#include "isph3a.h"
#include "isphist.h"

static unsigned int autoidle;
module_param(autoidle, int, 0444);
MODULE_PARM_DESC(autoidle, "Enable OMAP3ISP AUTOIDLE support");

static void isp_save_ctx(struct isp_device *isp);

static void isp_restore_ctx(struct isp_device *isp);

static const struct isp_res_mapping isp_res_maps[] = {
	{
		.isp_rev = ISP_REVISION_2_0,
		.map = 1 << OMAP3_ISP_IOMEM_MAIN |
		       1 << OMAP3_ISP_IOMEM_CCP2 |
		       1 << OMAP3_ISP_IOMEM_CCDC |
		       1 << OMAP3_ISP_IOMEM_HIST |
		       1 << OMAP3_ISP_IOMEM_H3A |
		       1 << OMAP3_ISP_IOMEM_PREV |
		       1 << OMAP3_ISP_IOMEM_RESZ |
		       1 << OMAP3_ISP_IOMEM_SBL |
		       1 << OMAP3_ISP_IOMEM_CSI2A_REGS1 |
		       1 << OMAP3_ISP_IOMEM_CSIPHY2 |
		       1 << OMAP3_ISP_IOMEM_343X_CONTROL_CSIRXFE,
	},
	{
		.isp_rev = ISP_REVISION_15_0,
		.map = 1 << OMAP3_ISP_IOMEM_MAIN |
		       1 << OMAP3_ISP_IOMEM_CCP2 |
		       1 << OMAP3_ISP_IOMEM_CCDC |
		       1 << OMAP3_ISP_IOMEM_HIST |
		       1 << OMAP3_ISP_IOMEM_H3A |
		       1 << OMAP3_ISP_IOMEM_PREV |
		       1 << OMAP3_ISP_IOMEM_RESZ |
		       1 << OMAP3_ISP_IOMEM_SBL |
		       1 << OMAP3_ISP_IOMEM_CSI2A_REGS1 |
		       1 << OMAP3_ISP_IOMEM_CSIPHY2 |
		       1 << OMAP3_ISP_IOMEM_CSI2A_REGS2 |
		       1 << OMAP3_ISP_IOMEM_CSI2C_REGS1 |
		       1 << OMAP3_ISP_IOMEM_CSIPHY1 |
		       1 << OMAP3_ISP_IOMEM_CSI2C_REGS2 |
		       1 << OMAP3_ISP_IOMEM_3630_CONTROL_CAMERA_PHY_CTRL,
	},
};

/* Structure for saving/restoring ISP module registers */
static struct isp_reg isp_reg_list[] = {
	{OMAP3_ISP_IOMEM_MAIN, ISP_SYSCONFIG, 0},
	{OMAP3_ISP_IOMEM_MAIN, ISP_CTRL, 0},
	{OMAP3_ISP_IOMEM_MAIN, ISP_TCTRL_CTRL, 0},
	{0, ISP_TOK_TERM, 0}
};

/*
 * omap3isp_flush - Post pending L3 bus writes by doing a register readback
 * @isp: OMAP3 ISP device
 *
 * In order to force posting of pending writes, we need to write and
 * readback the same register, in this case the revision register.
 *
 * See this link for reference:
 *   http://www.mail-archive.com/linux-omap@vger.kernel.org/msg08149.html
 */
void omap3isp_flush(struct isp_device *isp)
{
	isp_reg_writel(isp, 0, OMAP3_ISP_IOMEM_MAIN, ISP_REVISION);
	isp_reg_readl(isp, OMAP3_ISP_IOMEM_MAIN, ISP_REVISION);
}

/* -----------------------------------------------------------------------------
 * XCLK
 */

#define to_isp_xclk(_hw)	container_of(_hw, struct isp_xclk, hw)

static void isp_xclk_update(struct isp_xclk *xclk, u32 divider)
{
	switch (xclk->id) {
	case ISP_XCLK_A:
		isp_reg_clr_set(xclk->isp, OMAP3_ISP_IOMEM_MAIN, ISP_TCTRL_CTRL,
				ISPTCTRL_CTRL_DIVA_MASK,
				divider << ISPTCTRL_CTRL_DIVA_SHIFT);
		break;
	case ISP_XCLK_B:
		isp_reg_clr_set(xclk->isp, OMAP3_ISP_IOMEM_MAIN, ISP_TCTRL_CTRL,
				ISPTCTRL_CTRL_DIVB_MASK,
				divider << ISPTCTRL_CTRL_DIVB_SHIFT);
		break;
	}
}

static int isp_xclk_prepare(struct clk_hw *hw)
{
	struct isp_xclk *xclk = to_isp_xclk(hw);

	omap3isp_get(xclk->isp);

	return 0;
}

static void isp_xclk_unprepare(struct clk_hw *hw)
{
	struct isp_xclk *xclk = to_isp_xclk(hw);

	omap3isp_put(xclk->isp);
}

static int isp_xclk_enable(struct clk_hw *hw)
{
	struct isp_xclk *xclk = to_isp_xclk(hw);
	unsigned long flags;

	spin_lock_irqsave(&xclk->lock, flags);
	isp_xclk_update(xclk, xclk->divider);
	xclk->enabled = true;
	spin_unlock_irqrestore(&xclk->lock, flags);

	return 0;
}

static void isp_xclk_disable(struct clk_hw *hw)
{
	struct isp_xclk *xclk = to_isp_xclk(hw);
	unsigned long flags;

	spin_lock_irqsave(&xclk->lock, flags);
	isp_xclk_update(xclk, 0);
	xclk->enabled = false;
	spin_unlock_irqrestore(&xclk->lock, flags);
}

static unsigned long isp_xclk_recalc_rate(struct clk_hw *hw,
					  unsigned long parent_rate)
{
	struct isp_xclk *xclk = to_isp_xclk(hw);

	return parent_rate / xclk->divider;
}

static u32 isp_xclk_calc_divider(unsigned long *rate, unsigned long parent_rate)
{
	u32 divider;

	if (*rate >= parent_rate) {
		*rate = parent_rate;
		return ISPTCTRL_CTRL_DIV_BYPASS;
	}

	divider = DIV_ROUND_CLOSEST(parent_rate, *rate);
	if (divider >= ISPTCTRL_CTRL_DIV_BYPASS)
		divider = ISPTCTRL_CTRL_DIV_BYPASS - 1;

	*rate = parent_rate / divider;
	return divider;
}

static long isp_xclk_round_rate(struct clk_hw *hw, unsigned long rate,
				unsigned long *parent_rate)
{
	isp_xclk_calc_divider(&rate, *parent_rate);
	return rate;
}

static int isp_xclk_set_rate(struct clk_hw *hw, unsigned long rate,
			     unsigned long parent_rate)
{
	struct isp_xclk *xclk = to_isp_xclk(hw);
	unsigned long flags;
	u32 divider;

	divider = isp_xclk_calc_divider(&rate, parent_rate);

	spin_lock_irqsave(&xclk->lock, flags);

	xclk->divider = divider;
	if (xclk->enabled)
		isp_xclk_update(xclk, divider);

	spin_unlock_irqrestore(&xclk->lock, flags);

	dev_dbg(xclk->isp->dev, "%s: cam_xclk%c set to %lu Hz (div %u)\n",
		__func__, xclk->id == ISP_XCLK_A ? 'a' : 'b', rate, divider);
	return 0;
}

static const struct clk_ops isp_xclk_ops = {
	.prepare = isp_xclk_prepare,
	.unprepare = isp_xclk_unprepare,
	.enable = isp_xclk_enable,
	.disable = isp_xclk_disable,
	.recalc_rate = isp_xclk_recalc_rate,
	.round_rate = isp_xclk_round_rate,
	.set_rate = isp_xclk_set_rate,
};

static const char *isp_xclk_parent_name = "cam_mclk";

static const struct clk_init_data isp_xclk_init_data = {
	.name = "cam_xclk",
	.ops = &isp_xclk_ops,
	.parent_names = &isp_xclk_parent_name,
	.num_parents = 1,
};

static int isp_xclk_init(struct isp_device *isp)
{
	struct isp_platform_data *pdata = isp->pdata;
	struct clk_init_data init;
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(isp->xclks); ++i) {
		struct isp_xclk *xclk = &isp->xclks[i];
		struct clk *clk;

		xclk->isp = isp;
		xclk->id = i == 0 ? ISP_XCLK_A : ISP_XCLK_B;
		xclk->divider = 1;
		spin_lock_init(&xclk->lock);

		init.name = i == 0 ? "cam_xclka" : "cam_xclkb";
		init.ops = &isp_xclk_ops;
		init.parent_names = &isp_xclk_parent_name;
		init.num_parents = 1;

		xclk->hw.init = &init;

		clk = devm_clk_register(isp->dev, &xclk->hw);
		if (IS_ERR(clk))
			return PTR_ERR(clk);

		if (pdata->xclks[i].con_id == NULL &&
		    pdata->xclks[i].dev_id == NULL)
			continue;

		xclk->lookup = kzalloc(sizeof(*xclk->lookup), GFP_KERNEL);
		if (xclk->lookup == NULL)
			return -ENOMEM;

		xclk->lookup->con_id = pdata->xclks[i].con_id;
		xclk->lookup->dev_id = pdata->xclks[i].dev_id;
		xclk->lookup->clk = clk;

		clkdev_add(xclk->lookup);
	}

	return 0;
}

static void isp_xclk_cleanup(struct isp_device *isp)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(isp->xclks); ++i) {
		struct isp_xclk *xclk = &isp->xclks[i];

		if (xclk->lookup)
			clkdev_drop(xclk->lookup);
	}
}

/* -----------------------------------------------------------------------------
 * Interrupts
 */

/*
 * isp_enable_interrupts - Enable ISP interrupts.
 * @isp: OMAP3 ISP device
 */
static void isp_enable_interrupts(struct isp_device *isp)
{
	static const u32 irq = IRQ0ENABLE_CSIA_IRQ
			     | IRQ0ENABLE_CSIB_IRQ
			     | IRQ0ENABLE_CCDC_LSC_PREF_ERR_IRQ
			     | IRQ0ENABLE_CCDC_LSC_DONE_IRQ
			     | IRQ0ENABLE_CCDC_VD0_IRQ
			     | IRQ0ENABLE_CCDC_VD1_IRQ
			     | IRQ0ENABLE_HS_VS_IRQ
			     | IRQ0ENABLE_HIST_DONE_IRQ
			     | IRQ0ENABLE_H3A_AWB_DONE_IRQ
			     | IRQ0ENABLE_H3A_AF_DONE_IRQ
			     | IRQ0ENABLE_PRV_DONE_IRQ
			     | IRQ0ENABLE_RSZ_DONE_IRQ;

	isp_reg_writel(isp, irq, OMAP3_ISP_IOMEM_MAIN, ISP_IRQ0STATUS);
	isp_reg_writel(isp, irq, OMAP3_ISP_IOMEM_MAIN, ISP_IRQ0ENABLE);
}

/*
 * isp_disable_interrupts - Disable ISP interrupts.
 * @isp: OMAP3 ISP device
 */
static void isp_disable_interrupts(struct isp_device *isp)
{
	isp_reg_writel(isp, 0, OMAP3_ISP_IOMEM_MAIN, ISP_IRQ0ENABLE);
}

/*
 * isp_core_init - ISP core settings
 * @isp: OMAP3 ISP device
 * @idle: Consider idle state.
 *
 * Set the power settings for the ISP and SBL bus and cConfigure the HS/VS
 * interrupt source.
 *
 * We need to configure the HS/VS interrupt source before interrupts get
 * enabled, as the sensor might be free-running and the ISP default setting
 * (HS edge) would put an unnecessary burden on the CPU.
 */
static void isp_core_init(struct isp_device *isp, int idle)
{
	isp_reg_writel(isp,
		       ((idle ? ISP_SYSCONFIG_MIDLEMODE_SMARTSTANDBY :
				ISP_SYSCONFIG_MIDLEMODE_FORCESTANDBY) <<
			ISP_SYSCONFIG_MIDLEMODE_SHIFT) |
			((isp->revision == ISP_REVISION_15_0) ?
			  ISP_SYSCONFIG_AUTOIDLE : 0),
		       OMAP3_ISP_IOMEM_MAIN, ISP_SYSCONFIG);

	isp_reg_writel(isp,
		       (isp->autoidle ? ISPCTRL_SBL_AUTOIDLE : 0) |
		       ISPCTRL_SYNC_DETECT_VSRISE,
		       OMAP3_ISP_IOMEM_MAIN, ISP_CTRL);
}

/*
 * Configure the bridge and lane shifter. Valid inputs are
 *
 * CCDC_INPUT_PARALLEL: Parallel interface
 * CCDC_INPUT_CSI2A: CSI2a receiver
 * CCDC_INPUT_CCP2B: CCP2b receiver
 * CCDC_INPUT_CSI2C: CSI2c receiver
 *
 * The bridge and lane shifter are configured according to the selected input
 * and the ISP platform data.
 */
void omap3isp_configure_bridge(struct isp_device *isp,
			       enum ccdc_input_entity input,
			       const struct isp_parallel_platform_data *pdata,
			       unsigned int shift, unsigned int bridge)
{
	u32 ispctrl_val;

	ispctrl_val  = isp_reg_readl(isp, OMAP3_ISP_IOMEM_MAIN, ISP_CTRL);
	ispctrl_val &= ~ISPCTRL_SHIFT_MASK;
	ispctrl_val &= ~ISPCTRL_PAR_CLK_POL_INV;
	ispctrl_val &= ~ISPCTRL_PAR_SER_CLK_SEL_MASK;
	ispctrl_val &= ~ISPCTRL_PAR_BRIDGE_MASK;
	ispctrl_val |= bridge;

	switch (input) {
	case CCDC_INPUT_PARALLEL:
		ispctrl_val |= ISPCTRL_PAR_SER_CLK_SEL_PARALLEL;
		ispctrl_val |= pdata->clk_pol << ISPCTRL_PAR_CLK_POL_SHIFT;
		shift += pdata->data_lane_shift * 2;
		break;

	case CCDC_INPUT_CSI2A:
		ispctrl_val |= ISPCTRL_PAR_SER_CLK_SEL_CSIA;
		break;

	case CCDC_INPUT_CCP2B:
		ispctrl_val |= ISPCTRL_PAR_SER_CLK_SEL_CSIB;
		break;

	case CCDC_INPUT_CSI2C:
		ispctrl_val |= ISPCTRL_PAR_SER_CLK_SEL_CSIC;
		break;

	default:
		return;
	}

	ispctrl_val |= ((shift/2) << ISPCTRL_SHIFT_SHIFT) & ISPCTRL_SHIFT_MASK;

	isp_reg_writel(isp, ispctrl_val, OMAP3_ISP_IOMEM_MAIN, ISP_CTRL);
}

void omap3isp_hist_dma_done(struct isp_device *isp)
{
	if (omap3isp_ccdc_busy(&isp->isp_ccdc) ||
	    omap3isp_stat_pcr_busy(&isp->isp_hist)) {
		/* Histogram cannot be enabled in this frame anymore */
		atomic_set(&isp->isp_hist.buf_err, 1);
		dev_dbg(isp->dev, "hist: Out of synchronization with "
				  "CCDC. Ignoring next buffer.\n");
	}
}

static inline void isp_isr_dbg(struct isp_device *isp, u32 irqstatus)
{
	static const char *name[] = {
		"CSIA_IRQ",
		"res1",
		"res2",
		"CSIB_LCM_IRQ",
		"CSIB_IRQ",
		"res5",
		"res6",
		"res7",
		"CCDC_VD0_IRQ",
		"CCDC_VD1_IRQ",
		"CCDC_VD2_IRQ",
		"CCDC_ERR_IRQ",
		"H3A_AF_DONE_IRQ",
		"H3A_AWB_DONE_IRQ",
		"res14",
		"res15",
		"HIST_DONE_IRQ",
		"CCDC_LSC_DONE",
		"CCDC_LSC_PREFETCH_COMPLETED",
		"CCDC_LSC_PREFETCH_ERROR",
		"PRV_DONE_IRQ",
		"CBUFF_IRQ",
		"res22",
		"res23",
		"RSZ_DONE_IRQ",
		"OVF_IRQ",
		"res26",
		"res27",
		"MMU_ERR_IRQ",
		"OCP_ERR_IRQ",
		"SEC_ERR_IRQ",
		"HS_VS_IRQ",
	};
	int i;

	dev_dbg(isp->dev, "ISP IRQ: ");

	for (i = 0; i < ARRAY_SIZE(name); i++) {
		if ((1 << i) & irqstatus)
			printk(KERN_CONT "%s ", name[i]);
	}
	printk(KERN_CONT "\n");
}

static void isp_isr_sbl(struct isp_device *isp)
{
	struct device *dev = isp->dev;
	struct isp_pipeline *pipe;
	u32 sbl_pcr;

	/*
	 * Handle shared buffer logic overflows for video buffers.
	 * ISPSBL_PCR_CCDCPRV_2_RSZ_OVF can be safely ignored.
	 */
	sbl_pcr = isp_reg_readl(isp, OMAP3_ISP_IOMEM_SBL, ISPSBL_PCR);
	isp_reg_writel(isp, sbl_pcr, OMAP3_ISP_IOMEM_SBL, ISPSBL_PCR);
	sbl_pcr &= ~ISPSBL_PCR_CCDCPRV_2_RSZ_OVF;

	if (sbl_pcr)
		dev_dbg(dev, "SBL overflow (PCR = 0x%08x)\n", sbl_pcr);

	if (sbl_pcr & ISPSBL_PCR_CSIB_WBL_OVF) {
		pipe = to_isp_pipeline(&isp->isp_ccp2.subdev.entity);
		if (pipe != NULL)
			pipe->error = true;
	}

	if (sbl_pcr & ISPSBL_PCR_CSIA_WBL_OVF) {
		pipe = to_isp_pipeline(&isp->isp_csi2a.subdev.entity);
		if (pipe != NULL)
			pipe->error = true;
	}

	if (sbl_pcr & ISPSBL_PCR_CCDC_WBL_OVF) {
		pipe = to_isp_pipeline(&isp->isp_ccdc.subdev.entity);
		if (pipe != NULL)
			pipe->error = true;
	}

	if (sbl_pcr & ISPSBL_PCR_PRV_WBL_OVF) {
		pipe = to_isp_pipeline(&isp->isp_prev.subdev.entity);
		if (pipe != NULL)
			pipe->error = true;
	}

	if (sbl_pcr & (ISPSBL_PCR_RSZ1_WBL_OVF
		       | ISPSBL_PCR_RSZ2_WBL_OVF
		       | ISPSBL_PCR_RSZ3_WBL_OVF
		       | ISPSBL_PCR_RSZ4_WBL_OVF)) {
		pipe = to_isp_pipeline(&isp->isp_res.subdev.entity);
		if (pipe != NULL)
			pipe->error = true;
	}

	if (sbl_pcr & ISPSBL_PCR_H3A_AF_WBL_OVF)
		omap3isp_stat_sbl_overflow(&isp->isp_af);

	if (sbl_pcr & ISPSBL_PCR_H3A_AEAWB_WBL_OVF)
		omap3isp_stat_sbl_overflow(&isp->isp_aewb);
}

/*
 * isp_isr - Interrupt Service Routine for Camera ISP module.
 * @irq: Not used currently.
 * @_isp: Pointer to the OMAP3 ISP device
 *
 * Handles the corresponding callback if plugged in.
 *
 * Returns IRQ_HANDLED when IRQ was correctly handled, or IRQ_NONE when the
 * IRQ wasn't handled.
 */
static irqreturn_t isp_isr(int irq, void *_isp)
{
	static const u32 ccdc_events = IRQ0STATUS_CCDC_LSC_PREF_ERR_IRQ |
				       IRQ0STATUS_CCDC_LSC_DONE_IRQ |
				       IRQ0STATUS_CCDC_VD0_IRQ |
				       IRQ0STATUS_CCDC_VD1_IRQ |
				       IRQ0STATUS_HS_VS_IRQ;
	struct isp_device *isp = _isp;
	u32 irqstatus;

	irqstatus = isp_reg_readl(isp, OMAP3_ISP_IOMEM_MAIN, ISP_IRQ0STATUS);
	isp_reg_writel(isp, irqstatus, OMAP3_ISP_IOMEM_MAIN, ISP_IRQ0STATUS);

	isp_isr_sbl(isp);

	if (irqstatus & IRQ0STATUS_CSIA_IRQ)
		omap3isp_csi2_isr(&isp->isp_csi2a);

	if (irqstatus & IRQ0STATUS_CSIB_IRQ)
		omap3isp_ccp2_isr(&isp->isp_ccp2);

	if (irqstatus & IRQ0STATUS_CCDC_VD0_IRQ) {
		if (isp->isp_ccdc.output & CCDC_OUTPUT_PREVIEW)
			omap3isp_preview_isr_frame_sync(&isp->isp_prev);
		if (isp->isp_ccdc.output & CCDC_OUTPUT_RESIZER)
			omap3isp_resizer_isr_frame_sync(&isp->isp_res);
		omap3isp_stat_isr_frame_sync(&isp->isp_aewb);
		omap3isp_stat_isr_frame_sync(&isp->isp_af);
		omap3isp_stat_isr_frame_sync(&isp->isp_hist);
	}

	if (irqstatus & ccdc_events)
		omap3isp_ccdc_isr(&isp->isp_ccdc, irqstatus & ccdc_events);

	if (irqstatus & IRQ0STATUS_PRV_DONE_IRQ) {
		if (isp->isp_prev.output & PREVIEW_OUTPUT_RESIZER)
			omap3isp_resizer_isr_frame_sync(&isp->isp_res);
		omap3isp_preview_isr(&isp->isp_prev);
	}

	if (irqstatus & IRQ0STATUS_RSZ_DONE_IRQ)
		omap3isp_resizer_isr(&isp->isp_res);

	if (irqstatus & IRQ0STATUS_H3A_AWB_DONE_IRQ)
		omap3isp_stat_isr(&isp->isp_aewb);

	if (irqstatus & IRQ0STATUS_H3A_AF_DONE_IRQ)
		omap3isp_stat_isr(&isp->isp_af);

	if (irqstatus & IRQ0STATUS_HIST_DONE_IRQ)
		omap3isp_stat_isr(&isp->isp_hist);

	omap3isp_flush(isp);

#if defined(DEBUG) && defined(ISP_ISR_DEBUG)
	isp_isr_dbg(isp, irqstatus);
#endif

	return IRQ_HANDLED;
}

/* -----------------------------------------------------------------------------
 * Pipeline power management
 *
 * Entities must be powered up when part of a pipeline that contains at least
 * one open video device node.
 *
 * To achieve this use the entity use_count field to track the number of users.
 * For entities corresponding to video device nodes the use_count field stores
 * the users count of the node. For entities corresponding to subdevs the
 * use_count field stores the total number of users of all video device nodes
 * in the pipeline.
 *
 * The omap3isp_pipeline_pm_use() function must be called in the open() and
 * close() handlers of video device nodes. It increments or decrements the use
 * count of all subdev entities in the pipeline.
 *
 * To react to link management on powered pipelines, the link setup notification
 * callback updates the use count of all entities in the source and sink sides
 * of the link.
 */

/*
 * isp_pipeline_pm_use_count - Count the number of users of a pipeline
 * @entity: The entity
 *
 * Return the total number of users of all video device nodes in the pipeline.
 */
static int isp_pipeline_pm_use_count(struct media_entity *entity)
{
	struct media_entity_graph graph;
	int use = 0;

	media_entity_graph_walk_start(&graph, entity);

	while ((entity = media_entity_graph_walk_next(&graph))) {
		if (media_entity_type(entity) == MEDIA_ENT_T_DEVNODE)
			use += entity->use_count;
	}

	return use;
}

/*
 * isp_pipeline_pm_power_one - Apply power change to an entity
 * @entity: The entity
 * @change: Use count change
 *
 * Change the entity use count by @change. If the entity is a subdev update its
 * power state by calling the core::s_power operation when the use count goes
 * from 0 to != 0 or from != 0 to 0.
 *
 * Return 0 on success or a negative error code on failure.
 */
static int isp_pipeline_pm_power_one(struct media_entity *entity, int change)
{
	struct v4l2_subdev *subdev;
	int ret;

	subdev = media_entity_type(entity) == MEDIA_ENT_T_V4L2_SUBDEV
	       ? media_entity_to_v4l2_subdev(entity) : NULL;

	if (entity->use_count == 0 && change > 0 && subdev != NULL) {
		ret = v4l2_subdev_call(subdev, core, s_power, 1);
		if (ret < 0 && ret != -ENOIOCTLCMD)
			return ret;
	}

	entity->use_count += change;
	WARN_ON(entity->use_count < 0);

	if (entity->use_count == 0 && change < 0 && subdev != NULL)
		v4l2_subdev_call(subdev, core, s_power, 0);

	return 0;
}

/*
 * isp_pipeline_pm_power - Apply power change to all entities in a pipeline
 * @entity: The entity
 * @change: Use count change
 *
 * Walk the pipeline to update the use count and the power state of all non-node
 * entities.
 *
 * Return 0 on success or a negative error code on failure.
 */
static int isp_pipeline_pm_power(struct media_entity *entity, int change)
{
	struct media_entity_graph graph;
	struct media_entity *first = entity;
	int ret = 0;

	if (!change)
		return 0;

	media_entity_graph_walk_start(&graph, entity);

	while (!ret && (entity = media_entity_graph_walk_next(&graph)))
		if (media_entity_type(entity) != MEDIA_ENT_T_DEVNODE)
			ret = isp_pipeline_pm_power_one(entity, change);

	if (!ret)
		return 0;

	media_entity_graph_walk_start(&graph, first);

	while ((first = media_entity_graph_walk_next(&graph))
	       && first != entity)
		if (media_entity_type(first) != MEDIA_ENT_T_DEVNODE)
			isp_pipeline_pm_power_one(first, -change);

	return ret;
}

/*
 * omap3isp_pipeline_pm_use - Update the use count of an entity
 * @entity: The entity
 * @use: Use (1) or stop using (0) the entity
 *
 * Update the use count of all entities in the pipeline and power entities on or
 * off accordingly.
 *
 * Return 0 on success or a negative error code on failure. Powering entities
 * off is assumed to never fail. No failure can occur when the use parameter is
 * set to 0.
 */
int omap3isp_pipeline_pm_use(struct media_entity *entity, int use)
{
	int change = use ? 1 : -1;
	int ret;

	mutex_lock(&entity->parent->graph_mutex);

	/* Apply use count to node. */
	entity->use_count += change;
	WARN_ON(entity->use_count < 0);

	/* Apply power change to connected non-nodes. */
	ret = isp_pipeline_pm_power(entity, change);
	if (ret < 0)
		entity->use_count -= change;

	mutex_unlock(&entity->parent->graph_mutex);

	return ret;
}

/*
 * isp_pipeline_link_notify - Link management notification callback
 * @source: Pad at the start of the link
 * @sink: Pad at the end of the link
 * @flags: New link flags that will be applied
 *
 * React to link management on powered pipelines by updating the use count of
 * all entities in the source and sink sides of the link. Entities are powered
 * on or off accordingly.
 *
 * Return 0 on success or a negative error code on failure. Powering entities
 * off is assumed to never fail. This function will not fail for disconnection
 * events.
 */
static int isp_pipeline_link_notify(struct media_pad *source,
				    struct media_pad *sink, u32 flags)
{
	int source_use = isp_pipeline_pm_use_count(source->entity);
	int sink_use = isp_pipeline_pm_use_count(sink->entity);
	int ret;

	if (!(flags & MEDIA_LNK_FL_ENABLED)) {
		/* Powering off entities is assumed to never fail. */
		isp_pipeline_pm_power(source->entity, -sink_use);
		isp_pipeline_pm_power(sink->entity, -source_use);
		return 0;
	}

	ret = isp_pipeline_pm_power(source->entity, sink_use);
	if (ret < 0)
		return ret;

	ret = isp_pipeline_pm_power(sink->entity, source_use);
	if (ret < 0)
		isp_pipeline_pm_power(source->entity, -sink_use);

	return ret;
}

/* -----------------------------------------------------------------------------
 * Pipeline stream management
 */

/*
 * isp_pipeline_enable - Enable streaming on a pipeline
 * @pipe: ISP pipeline
 * @mode: Stream mode (single shot or continuous)
 *
 * Walk the entities chain starting at the pipeline output video node and start
 * all modules in the chain in the given mode.
 *
 * Return 0 if successful, or the return value of the failed video::s_stream
 * operation otherwise.
 */
static int isp_pipeline_enable(struct isp_pipeline *pipe,
			       enum isp_pipeline_stream_state mode)
{
	struct isp_device *isp = pipe->output->isp;
	struct media_entity *entity;
	struct media_pad *pad;
	struct v4l2_subdev *subdev;
	unsigned long flags;
	int ret;

	/* If the preview engine crashed it might not respond to read/write
	 * operations on the L4 bus. This would result in a bus fault and a
	 * kernel oops. Refuse to start streaming in that case. This check must
	 * be performed before the loop below to avoid starting entities if the
	 * pipeline won't start anyway (those entities would then likely fail to
	 * stop, making the problem worse).
	 */
	if ((pipe->entities & isp->crashed) &
	    (1U << isp->isp_prev.subdev.entity.id))
		return -EIO;

	spin_lock_irqsave(&pipe->lock, flags);
	pipe->state &= ~(ISP_PIPELINE_IDLE_INPUT | ISP_PIPELINE_IDLE_OUTPUT);
	spin_unlock_irqrestore(&pipe->lock, flags);

	pipe->do_propagation = false;

	entity = &pipe->output->video.entity;
	while (1) {
		pad = &entity->pads[0];
		if (!(pad->flags & MEDIA_PAD_FL_SINK))
			break;

		pad = media_entity_remote_source(pad);
		if (pad == NULL ||
		    media_entity_type(pad->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
			break;

		entity = pad->entity;
		subdev = media_entity_to_v4l2_subdev(entity);

		ret = v4l2_subdev_call(subdev, video, s_stream, mode);
		if (ret < 0 && ret != -ENOIOCTLCMD)
			return ret;

		if (subdev == &isp->isp_ccdc.subdev) {
			v4l2_subdev_call(&isp->isp_aewb.subdev, video,
					s_stream, mode);
			v4l2_subdev_call(&isp->isp_af.subdev, video,
					s_stream, mode);
			v4l2_subdev_call(&isp->isp_hist.subdev, video,
					s_stream, mode);
			pipe->do_propagation = true;
		}
	}

	return 0;
}

static int isp_pipeline_wait_resizer(struct isp_device *isp)
{
	return omap3isp_resizer_busy(&isp->isp_res);
}

static int isp_pipeline_wait_preview(struct isp_device *isp)
{
	return omap3isp_preview_busy(&isp->isp_prev);
}

static int isp_pipeline_wait_ccdc(struct isp_device *isp)
{
	return omap3isp_stat_busy(&isp->isp_af)
	    || omap3isp_stat_busy(&isp->isp_aewb)
	    || omap3isp_stat_busy(&isp->isp_hist)
	    || omap3isp_ccdc_busy(&isp->isp_ccdc);
}

#define ISP_STOP_TIMEOUT	msecs_to_jiffies(1000)

static int isp_pipeline_wait(struct isp_device *isp,
			     int(*busy)(struct isp_device *isp))
{
	unsigned long timeout = jiffies + ISP_STOP_TIMEOUT;

	while (!time_after(jiffies, timeout)) {
		if (!busy(isp))
			return 0;
	}

	return 1;
}

/*
 * isp_pipeline_disable - Disable streaming on a pipeline
 * @pipe: ISP pipeline
 *
 * Walk the entities chain starting at the pipeline output video node and stop
 * all modules in the chain. Wait synchronously for the modules to be stopped if
 * necessary.
 *
 * Return 0 if all modules have been properly stopped, or -ETIMEDOUT if a module
 * can't be stopped (in which case a software reset of the ISP is probably
 * necessary).
 */
static int isp_pipeline_disable(struct isp_pipeline *pipe)
{
	struct isp_device *isp = pipe->output->isp;
	struct media_entity *entity;
	struct media_pad *pad;
	struct v4l2_subdev *subdev;
	int failure = 0;
	int ret;

	/*
	 * We need to stop all the modules after CCDC first or they'll
	 * never stop since they may not get a full frame from CCDC.
	 */
	entity = &pipe->output->video.entity;
	while (1) {
		pad = &entity->pads[0];
		if (!(pad->flags & MEDIA_PAD_FL_SINK))
			break;

		pad = media_entity_remote_source(pad);
		if (pad == NULL ||
		    media_entity_type(pad->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
			break;

		entity = pad->entity;
		subdev = media_entity_to_v4l2_subdev(entity);

		if (subdev == &isp->isp_ccdc.subdev) {
			v4l2_subdev_call(&isp->isp_aewb.subdev,
					 video, s_stream, 0);
			v4l2_subdev_call(&isp->isp_af.subdev,
					 video, s_stream, 0);
			v4l2_subdev_call(&isp->isp_hist.subdev,
					 video, s_stream, 0);
		}

		v4l2_subdev_call(subdev, video, s_stream, 0);

		if (subdev == &isp->isp_res.subdev)
			ret = isp_pipeline_wait(isp, isp_pipeline_wait_resizer);
		else if (subdev == &isp->isp_prev.subdev)
			ret = isp_pipeline_wait(isp, isp_pipeline_wait_preview);
		else if (subdev == &isp->isp_ccdc.subdev)
			ret = isp_pipeline_wait(isp, isp_pipeline_wait_ccdc);
		else
			ret = 0;

		if (ret) {
			dev_info(isp->dev, "Unable to stop %s\n", subdev->name);
			/* If the entity failed to stopped, assume it has
			 * crashed. Mark it as such, the ISP will be reset when
			 * applications will release it.
			 */
			isp->crashed |= 1U << subdev->entity.id;
			failure = -ETIMEDOUT;
		}
	}

	return failure;
}

/*
 * omap3isp_pipeline_set_stream - Enable/disable streaming on a pipeline
 * @pipe: ISP pipeline
 * @state: Stream state (stopped, single shot or continuous)
 *
 * Set the pipeline to the given stream state. Pipelines can be started in
 * single-shot or continuous mode.
 *
 * Return 0 if successful, or the return value of the failed video::s_stream
 * operation otherwise. The pipeline state is not updated when the operation
 * fails, except when stopping the pipeline.
 */
int omap3isp_pipeline_set_stream(struct isp_pipeline *pipe,
				 enum isp_pipeline_stream_state state)
{
	int ret;

	if (state == ISP_PIPELINE_STREAM_STOPPED)
		ret = isp_pipeline_disable(pipe);
	else
		ret = isp_pipeline_enable(pipe, state);

	if (ret == 0 || state == ISP_PIPELINE_STREAM_STOPPED)
		pipe->stream_state = state;

	return ret;
}

/*
 * isp_pipeline_resume - Resume streaming on a pipeline
 * @pipe: ISP pipeline
 *
 * Resume video output and input and re-enable pipeline.
 */
static void isp_pipeline_resume(struct isp_pipeline *pipe)
{
	int singleshot = pipe->stream_state == ISP_PIPELINE_STREAM_SINGLESHOT;

	omap3isp_video_resume(pipe->output, !singleshot);
	if (singleshot)
		omap3isp_video_resume(pipe->input, 0);
	isp_pipeline_enable(pipe, pipe->stream_state);
}

/*
 * isp_pipeline_suspend - Suspend streaming on a pipeline
 * @pipe: ISP pipeline
 *
 * Suspend pipeline.
 */
static void isp_pipeline_suspend(struct isp_pipeline *pipe)
{
	isp_pipeline_disable(pipe);
}

/*
 * isp_pipeline_is_last - Verify if entity has an enabled link to the output
 * 			  video node
 * @me: ISP module's media entity
 *
 * Returns 1 if the entity has an enabled link to the output video node or 0
 * otherwise. It's true only while pipeline can have no more than one output
 * node.
 */
static int isp_pipeline_is_last(struct media_entity *me)
{
	struct isp_pipeline *pipe;
	struct media_pad *pad;

	if (!me->pipe)
		return 0;
	pipe = to_isp_pipeline(me);
	if (pipe->stream_state == ISP_PIPELINE_STREAM_STOPPED)
		return 0;
	pad = media_entity_remote_source(&pipe->output->pad);
	return pad->entity == me;
}

/*
 * isp_suspend_module_pipeline - Suspend pipeline to which belongs the module
 * @me: ISP module's media entity
 *
 * Suspend the whole pipeline if module's entity has an enabled link to the
 * output video node. It works only while pipeline can have no more than one
 * output node.
 */
static void isp_suspend_module_pipeline(struct media_entity *me)
{
	if (isp_pipeline_is_last(me))
		isp_pipeline_suspend(to_isp_pipeline(me));
}

/*
 * isp_resume_module_pipeline - Resume pipeline to which belongs the module
 * @me: ISP module's media entity
 *
 * Resume the whole pipeline if module's entity has an enabled link to the
 * output video node. It works only while pipeline can have no more than one
 * output node.
 */
static void isp_resume_module_pipeline(struct media_entity *me)
{
	if (isp_pipeline_is_last(me))
		isp_pipeline_resume(to_isp_pipeline(me));
}

/*
 * isp_suspend_modules - Suspend ISP submodules.
 * @isp: OMAP3 ISP device
 *
 * Returns 0 if suspend left in idle state all the submodules properly,
 * or returns 1 if a general Reset is required to suspend the submodules.
 */
static int isp_suspend_modules(struct isp_device *isp)
{
	unsigned long timeout;

	omap3isp_stat_suspend(&isp->isp_aewb);
	omap3isp_stat_suspend(&isp->isp_af);
	omap3isp_stat_suspend(&isp->isp_hist);
	isp_suspend_module_pipeline(&isp->isp_res.subdev.entity);
	isp_suspend_module_pipeline(&isp->isp_prev.subdev.entity);
	isp_suspend_module_pipeline(&isp->isp_ccdc.subdev.entity);
	isp_suspend_module_pipeline(&isp->isp_csi2a.subdev.entity);
	isp_suspend_module_pipeline(&isp->isp_ccp2.subdev.entity);

	timeout = jiffies + ISP_STOP_TIMEOUT;
	while (omap3isp_stat_busy(&isp->isp_af)
	    || omap3isp_stat_busy(&isp->isp_aewb)
	    || omap3isp_stat_busy(&isp->isp_hist)
	    || omap3isp_preview_busy(&isp->isp_prev)
	    || omap3isp_resizer_busy(&isp->isp_res)
	    || omap3isp_ccdc_busy(&isp->isp_ccdc)) {
		if (time_after(jiffies, timeout)) {
			dev_info(isp->dev, "can't stop modules.\n");
			return 1;
		}
		msleep(1);
	}

	return 0;
}

/*
 * isp_resume_modules - Resume ISP submodules.
 * @isp: OMAP3 ISP device
 */
static void isp_resume_modules(struct isp_device *isp)
{
	omap3isp_stat_resume(&isp->isp_aewb);
	omap3isp_stat_resume(&isp->isp_af);
	omap3isp_stat_resume(&isp->isp_hist);
	isp_resume_module_pipeline(&isp->isp_res.subdev.entity);
	isp_resume_module_pipeline(&isp->isp_prev.subdev.entity);
	isp_resume_module_pipeline(&isp->isp_ccdc.subdev.entity);
	isp_resume_module_pipeline(&isp->isp_csi2a.subdev.entity);
	isp_resume_module_pipeline(&isp->isp_ccp2.subdev.entity);
}

/*
 * isp_reset - Reset ISP with a timeout wait for idle.
 * @isp: OMAP3 ISP device
 */
static int isp_reset(struct isp_device *isp)
{
	unsigned long timeout = 0;

	isp_reg_writel(isp,
		       isp_reg_readl(isp, OMAP3_ISP_IOMEM_MAIN, ISP_SYSCONFIG)
		       | ISP_SYSCONFIG_SOFTRESET,
		       OMAP3_ISP_IOMEM_MAIN, ISP_SYSCONFIG);
	while (!(isp_reg_readl(isp, OMAP3_ISP_IOMEM_MAIN,
			       ISP_SYSSTATUS) & 0x1)) {
		if (timeout++ > 10000) {
			dev_alert(isp->dev, "cannot reset ISP\n");
			return -ETIMEDOUT;
		}
		udelay(1);
	}

	isp->crashed = 0;
	return 0;
}

/*
 * isp_save_context - Saves the values of the ISP module registers.
 * @isp: OMAP3 ISP device
 * @reg_list: Structure containing pairs of register address and value to
 *            modify on OMAP.
 */
static void
isp_save_context(struct isp_device *isp, struct isp_reg *reg_list)
{
	struct isp_reg *next = reg_list;

	for (; next->reg != ISP_TOK_TERM; next++)
		next->val = isp_reg_readl(isp, next->mmio_range, next->reg);
}

/*
 * isp_restore_context - Restores the values of the ISP module registers.
 * @isp: OMAP3 ISP device
 * @reg_list: Structure containing pairs of register address and value to
 *            modify on OMAP.
 */
static void
isp_restore_context(struct isp_device *isp, struct isp_reg *reg_list)
{
	struct isp_reg *next = reg_list;

	for (; next->reg != ISP_TOK_TERM; next++)
		isp_reg_writel(isp, next->val, next->mmio_range, next->reg);
}

/*
 * isp_save_ctx - Saves ISP, CCDC, HIST, H3A, PREV, RESZ & MMU context.
 * @isp: OMAP3 ISP device
 *
 * Routine for saving the context of each module in the ISP.
 * CCDC, HIST, H3A, PREV, RESZ and MMU.
 */
static void isp_save_ctx(struct isp_device *isp)
{
	isp_save_context(isp, isp_reg_list);
	omap_iommu_save_ctx(isp->dev);
}

/*
 * isp_restore_ctx - Restores ISP, CCDC, HIST, H3A, PREV, RESZ & MMU context.
 * @isp: OMAP3 ISP device
 *
 * Routine for restoring the context of each module in the ISP.
 * CCDC, HIST, H3A, PREV, RESZ and MMU.
 */
static void isp_restore_ctx(struct isp_device *isp)
{
	isp_restore_context(isp, isp_reg_list);
	omap_iommu_restore_ctx(isp->dev);
	omap3isp_ccdc_restore_context(isp);
	omap3isp_preview_restore_context(isp);
}

/* -----------------------------------------------------------------------------
 * SBL resources management
 */
#define OMAP3_ISP_SBL_READ	(OMAP3_ISP_SBL_CSI1_READ | \
				 OMAP3_ISP_SBL_CCDC_LSC_READ | \
				 OMAP3_ISP_SBL_PREVIEW_READ | \
				 OMAP3_ISP_SBL_RESIZER_READ)
#define OMAP3_ISP_SBL_WRITE	(OMAP3_ISP_SBL_CSI1_WRITE | \
				 OMAP3_ISP_SBL_CSI2A_WRITE | \
				 OMAP3_ISP_SBL_CSI2C_WRITE | \
				 OMAP3_ISP_SBL_CCDC_WRITE | \
				 OMAP3_ISP_SBL_PREVIEW_WRITE)

void omap3isp_sbl_enable(struct isp_device *isp, enum isp_sbl_resource res)
{
	u32 sbl = 0;

	isp->sbl_resources |= res;

	if (isp->sbl_resources & OMAP3_ISP_SBL_CSI1_READ)
		sbl |= ISPCTRL_SBL_SHARED_RPORTA;

	if (isp->sbl_resources & OMAP3_ISP_SBL_CCDC_LSC_READ)
		sbl |= ISPCTRL_SBL_SHARED_RPORTB;

	if (isp->sbl_resources & OMAP3_ISP_SBL_CSI2C_WRITE)
		sbl |= ISPCTRL_SBL_SHARED_WPORTC;

	if (isp->sbl_resources & OMAP3_ISP_SBL_RESIZER_WRITE)
		sbl |= ISPCTRL_SBL_WR0_RAM_EN;

	if (isp->sbl_resources & OMAP3_ISP_SBL_WRITE)
		sbl |= ISPCTRL_SBL_WR1_RAM_EN;

	if (isp->sbl_resources & OMAP3_ISP_SBL_READ)
		sbl |= ISPCTRL_SBL_RD_RAM_EN;

	isp_reg_set(isp, OMAP3_ISP_IOMEM_MAIN, ISP_CTRL, sbl);
}

void omap3isp_sbl_disable(struct isp_device *isp, enum isp_sbl_resource res)
{
	u32 sbl = 0;

	isp->sbl_resources &= ~res;

	if (!(isp->sbl_resources & OMAP3_ISP_SBL_CSI1_READ))
		sbl |= ISPCTRL_SBL_SHARED_RPORTA;

	if (!(isp->sbl_resources & OMAP3_ISP_SBL_CCDC_LSC_READ))
		sbl |= ISPCTRL_SBL_SHARED_RPORTB;

	if (!(isp->sbl_resources & OMAP3_ISP_SBL_CSI2C_WRITE))
		sbl |= ISPCTRL_SBL_SHARED_WPORTC;

	if (!(isp->sbl_resources & OMAP3_ISP_SBL_RESIZER_WRITE))
		sbl |= ISPCTRL_SBL_WR0_RAM_EN;

	if (!(isp->sbl_resources & OMAP3_ISP_SBL_WRITE))
		sbl |= ISPCTRL_SBL_WR1_RAM_EN;

	if (!(isp->sbl_resources & OMAP3_ISP_SBL_READ))
		sbl |= ISPCTRL_SBL_RD_RAM_EN;

	isp_reg_clr(isp, OMAP3_ISP_IOMEM_MAIN, ISP_CTRL, sbl);
}

/*
 * isp_module_sync_idle - Helper to sync module with its idle state
 * @me: ISP submodule's media entity
 * @wait: ISP submodule's wait queue for streamoff/interrupt synchronization
 * @stopping: flag which tells module wants to stop
 *
 * This function checks if ISP submodule needs to wait for next interrupt. If
 * yes, makes the caller to sleep while waiting for such event.
 */
int omap3isp_module_sync_idle(struct media_entity *me, wait_queue_head_t *wait,
			      atomic_t *stopping)
{
	struct isp_pipeline *pipe = to_isp_pipeline(me);

	if (pipe->stream_state == ISP_PIPELINE_STREAM_STOPPED ||
	    (pipe->stream_state == ISP_PIPELINE_STREAM_SINGLESHOT &&
	     !isp_pipeline_ready(pipe)))
		return 0;

	/*
	 * atomic_set() doesn't include memory barrier on ARM platform for SMP
	 * scenario. We'll call it here to avoid race conditions.
	 */
	atomic_set(stopping, 1);
	smp_mb();

	/*
	 * If module is the last one, it's writing to memory. In this case,
	 * it's necessary to check if the module is already paused due to
	 * DMA queue underrun or if it has to wait for next interrupt to be
	 * idle.
	 * If it isn't the last one, the function won't sleep but *stopping
	 * will still be set to warn next submodule caller's interrupt the
	 * module wants to be idle.
	 */
	if (isp_pipeline_is_last(me)) {
		struct isp_video *video = pipe->output;
		unsigned long flags;
		spin_lock_irqsave(&video->queue->irqlock, flags);
		if (video->dmaqueue_flags & ISP_VIDEO_DMAQUEUE_UNDERRUN) {
			spin_unlock_irqrestore(&video->queue->irqlock, flags);
			atomic_set(stopping, 0);
			smp_mb();
			return 0;
		}
		spin_unlock_irqrestore(&video->queue->irqlock, flags);
		if (!wait_event_timeout(*wait, !atomic_read(stopping),
					msecs_to_jiffies(1000))) {
			atomic_set(stopping, 0);
			smp_mb();
			return -ETIMEDOUT;
		}
	}

	return 0;
}

/*
 * omap3isp_module_sync_is_stopped - Helper to verify if module was stopping
 * @wait: ISP submodule's wait queue for streamoff/interrupt synchronization
 * @stopping: flag which tells module wants to stop
 *
 * This function checks if ISP submodule was stopping. In case of yes, it
 * notices the caller by setting stopping to 0 and waking up the wait queue.
 * Returns 1 if it was stopping or 0 otherwise.
 */
int omap3isp_module_sync_is_stopping(wait_queue_head_t *wait,
				     atomic_t *stopping)
{
	if (atomic_cmpxchg(stopping, 1, 0)) {
		wake_up(wait);
		return 1;
	}

	return 0;
}

/* --------------------------------------------------------------------------
 * Clock management
 */

#define ISPCTRL_CLKS_MASK	(ISPCTRL_H3A_CLK_EN | \
				 ISPCTRL_HIST_CLK_EN | \
				 ISPCTRL_RSZ_CLK_EN | \
				 (ISPCTRL_CCDC_CLK_EN | ISPCTRL_CCDC_RAM_EN) | \
				 (ISPCTRL_PREV_CLK_EN | ISPCTRL_PREV_RAM_EN))

static void __isp_subclk_update(struct isp_device *isp)
{
	u32 clk = 0;

	/* AEWB and AF share the same clock. */
	if (isp->subclk_resources &
	    (OMAP3_ISP_SUBCLK_AEWB | OMAP3_ISP_SUBCLK_AF))
		clk |= ISPCTRL_H3A_CLK_EN;

	if (isp->subclk_resources & OMAP3_ISP_SUBCLK_HIST)
		clk |= ISPCTRL_HIST_CLK_EN;

	if (isp->subclk_resources & OMAP3_ISP_SUBCLK_RESIZER)
		clk |= ISPCTRL_RSZ_CLK_EN;

	/* NOTE: For CCDC & Preview submodules, we need to affect internal
	 *       RAM as well.
	 */
	if (isp->subclk_resources & OMAP3_ISP_SUBCLK_CCDC)
		clk |= ISPCTRL_CCDC_CLK_EN | ISPCTRL_CCDC_RAM_EN;

	if (isp->subclk_resources & OMAP3_ISP_SUBCLK_PREVIEW)
		clk |= ISPCTRL_PREV_CLK_EN | ISPCTRL_PREV_RAM_EN;

	isp_reg_clr_set(isp, OMAP3_ISP_IOMEM_MAIN, ISP_CTRL,
			ISPCTRL_CLKS_MASK, clk);
}

void omap3isp_subclk_enable(struct isp_device *isp,
			    enum isp_subclk_resource res)
{
	isp->subclk_resources |= res;

	__isp_subclk_update(isp);
}

void omap3isp_subclk_disable(struct isp_device *isp,
			     enum isp_subclk_resource res)
{
	isp->subclk_resources &= ~res;

	__isp_subclk_update(isp);
}

/*
 * isp_enable_clocks - Enable ISP clocks
 * @isp: OMAP3 ISP device
 *
 * Return 0 if successful, or clk_prepare_enable return value if any of them
 * fails.
 */
static int isp_enable_clocks(struct isp_device *isp)
{
	int r;
	unsigned long rate;

	r = clk_prepare_enable(isp->clock[ISP_CLK_CAM_ICK]);
	if (r) {
		dev_err(isp->dev, "failed to enable cam_ick clock\n");
		goto out_clk_enable_ick;
	}
	r = clk_set_rate(isp->clock[ISP_CLK_CAM_MCLK], CM_CAM_MCLK_HZ);
	if (r) {
		dev_err(isp->dev, "clk_set_rate for cam_mclk failed\n");
		goto out_clk_enable_mclk;
	}
	r = clk_prepare_enable(isp->clock[ISP_CLK_CAM_MCLK]);
	if (r) {
		dev_err(isp->dev, "failed to enable cam_mclk clock\n");
		goto out_clk_enable_mclk;
	}
	rate = clk_get_rate(isp->clock[ISP_CLK_CAM_MCLK]);
	if (rate != CM_CAM_MCLK_HZ)
		dev_warn(isp->dev, "unexpected cam_mclk rate:\n"
				   " expected : %d\n"
				   " actual   : %ld\n", CM_CAM_MCLK_HZ, rate);
	r = clk_prepare_enable(isp->clock[ISP_CLK_CSI2_FCK]);
	if (r) {
		dev_err(isp->dev, "failed to enable csi2_fck clock\n");
		goto out_clk_enable_csi2_fclk;
	}
	return 0;

out_clk_enable_csi2_fclk:
	clk_disable_unprepare(isp->clock[ISP_CLK_CAM_MCLK]);
out_clk_enable_mclk:
	clk_disable_unprepare(isp->clock[ISP_CLK_CAM_ICK]);
out_clk_enable_ick:
	return r;
}

/*
 * isp_disable_clocks - Disable ISP clocks
 * @isp: OMAP3 ISP device
 */
static void isp_disable_clocks(struct isp_device *isp)
{
	clk_disable_unprepare(isp->clock[ISP_CLK_CAM_ICK]);
	clk_disable_unprepare(isp->clock[ISP_CLK_CAM_MCLK]);
	clk_disable_unprepare(isp->clock[ISP_CLK_CSI2_FCK]);
}

static const char *isp_clocks[] = {
	"cam_ick",
	"cam_mclk",
	"csi2_96m_fck",
	"l3_ick",
};

static int isp_get_clocks(struct isp_device *isp)
{
	struct clk *clk;
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(isp_clocks); ++i) {
		clk = devm_clk_get(isp->dev, isp_clocks[i]);
		if (IS_ERR(clk)) {
			dev_err(isp->dev, "clk_get %s failed\n", isp_clocks[i]);
			return PTR_ERR(clk);
		}

		isp->clock[i] = clk;
	}

	return 0;
}

/*
 * omap3isp_get - Acquire the ISP resource.
 *
 * Initializes the clocks for the first acquire.
 *
 * Increment the reference count on the ISP. If the first reference is taken,
 * enable clocks and power-up all submodules.
 *
 * Return a pointer to the ISP device structure, or NULL if an error occurred.
 */
static struct isp_device *__omap3isp_get(struct isp_device *isp, bool irq)
{
	struct isp_device *__isp = isp;

	if (isp == NULL)
		return NULL;

	mutex_lock(&isp->isp_mutex);
	if (isp->ref_count > 0)
		goto out;

	if (isp_enable_clocks(isp) < 0) {
		__isp = NULL;
		goto out;
	}

	/* We don't want to restore context before saving it! */
	if (isp->has_context)
		isp_restore_ctx(isp);

	if (irq)
		isp_enable_interrupts(isp);

out:
	if (__isp != NULL)
		isp->ref_count++;
	mutex_unlock(&isp->isp_mutex);

	return __isp;
}

struct isp_device *omap3isp_get(struct isp_device *isp)
{
	return __omap3isp_get(isp, true);
}

/*
 * omap3isp_put - Release the ISP
 *
 * Decrement the reference count on the ISP. If the last reference is released,
 * power-down all submodules, disable clocks and free temporary buffers.
 */
void omap3isp_put(struct isp_device *isp)
{
	if (isp == NULL)
		return;

	mutex_lock(&isp->isp_mutex);
	BUG_ON(isp->ref_count == 0);
	if (--isp->ref_count == 0) {
		isp_disable_interrupts(isp);
		if (isp->domain) {
			isp_save_ctx(isp);
			isp->has_context = 1;
		}
		/* Reset the ISP if an entity has failed to stop. This is the
		 * only way to recover from such conditions.
		 */
		if (isp->crashed)
			isp_reset(isp);
		isp_disable_clocks(isp);
	}
	mutex_unlock(&isp->isp_mutex);
}

/* --------------------------------------------------------------------------
 * Platform device driver
 */

/*
 * omap3isp_print_status - Prints the values of the ISP Control Module registers
 * @isp: OMAP3 ISP device
 */
#define ISP_PRINT_REGISTER(isp, name)\
	dev_dbg(isp->dev, "###ISP " #name "=0x%08x\n", \
		isp_reg_readl(isp, OMAP3_ISP_IOMEM_MAIN, ISP_##name))
#define SBL_PRINT_REGISTER(isp, name)\
	dev_dbg(isp->dev, "###SBL " #name "=0x%08x\n", \
		isp_reg_readl(isp, OMAP3_ISP_IOMEM_SBL, ISPSBL_##name))

void omap3isp_print_status(struct isp_device *isp)
{
	dev_dbg(isp->dev, "-------------ISP Register dump--------------\n");

	ISP_PRINT_REGISTER(isp, SYSCONFIG);
	ISP_PRINT_REGISTER(isp, SYSSTATUS);
	ISP_PRINT_REGISTER(isp, IRQ0ENABLE);
	ISP_PRINT_REGISTER(isp, IRQ0STATUS);
	ISP_PRINT_REGISTER(isp, TCTRL_GRESET_LENGTH);
	ISP_PRINT_REGISTER(isp, TCTRL_PSTRB_REPLAY);
	ISP_PRINT_REGISTER(isp, CTRL);
	ISP_PRINT_REGISTER(isp, TCTRL_CTRL);
	ISP_PRINT_REGISTER(isp, TCTRL_FRAME);
	ISP_PRINT_REGISTER(isp, TCTRL_PSTRB_DELAY);
	ISP_PRINT_REGISTER(isp, TCTRL_STRB_DELAY);
	ISP_PRINT_REGISTER(isp, TCTRL_SHUT_DELAY);
	ISP_PRINT_REGISTER(isp, TCTRL_PSTRB_LENGTH);
	ISP_PRINT_REGISTER(isp, TCTRL_STRB_LENGTH);
	ISP_PRINT_REGISTER(isp, TCTRL_SHUT_LENGTH);

	SBL_PRINT_REGISTER(isp, PCR);
	SBL_PRINT_REGISTER(isp, SDR_REQ_EXP);

	dev_dbg(isp->dev, "--------------------------------------------\n");
}

#ifdef CONFIG_PM

/*
 * Power management support.
 *
 * As the ISP can't properly handle an input video stream interruption on a non
 * frame boundary, the ISP pipelines need to be stopped before sensors get
 * suspended. However, as suspending the sensors can require a running clock,
 * which can be provided by the ISP, the ISP can't be completely suspended
 * before the sensor.
 *
 * To solve this problem power management support is split into prepare/complete
 * and suspend/resume operations. The pipelines are stopped in prepare() and the
 * ISP clocks get disabled in suspend(). Similarly, the clocks are reenabled in
 * resume(), and the the pipelines are restarted in complete().
 *
 * TODO: PM dependencies between the ISP and sensors are not modeled explicitly
 * yet.
 */
static int isp_pm_prepare(struct device *dev)
{
	struct isp_device *isp = dev_get_drvdata(dev);
	int reset;

	WARN_ON(mutex_is_locked(&isp->isp_mutex));

	if (isp->ref_count == 0)
		return 0;

	reset = isp_suspend_modules(isp);
	isp_disable_interrupts(isp);
	isp_save_ctx(isp);
	if (reset)
		isp_reset(isp);

	return 0;
}

static int isp_pm_suspend(struct device *dev)
{
	struct isp_device *isp = dev_get_drvdata(dev);

	WARN_ON(mutex_is_locked(&isp->isp_mutex));

	if (isp->ref_count)
		isp_disable_clocks(isp);

	return 0;
}

static int isp_pm_resume(struct device *dev)
{
	struct isp_device *isp = dev_get_drvdata(dev);

	if (isp->ref_count == 0)
		return 0;

	return isp_enable_clocks(isp);
}

static void isp_pm_complete(struct device *dev)
{
	struct isp_device *isp = dev_get_drvdata(dev);

	if (isp->ref_count == 0)
		return;

	isp_restore_ctx(isp);
	isp_enable_interrupts(isp);
	isp_resume_modules(isp);
}

#else

#define isp_pm_prepare	NULL
#define isp_pm_suspend	NULL
#define isp_pm_resume	NULL
#define isp_pm_complete	NULL

#endif /* CONFIG_PM */

static void isp_unregister_entities(struct isp_device *isp)
{
	omap3isp_csi2_unregister_entities(&isp->isp_csi2a);
	omap3isp_ccp2_unregister_entities(&isp->isp_ccp2);
	omap3isp_ccdc_unregister_entities(&isp->isp_ccdc);
	omap3isp_preview_unregister_entities(&isp->isp_prev);
	omap3isp_resizer_unregister_entities(&isp->isp_res);
	omap3isp_stat_unregister_entities(&isp->isp_aewb);
	omap3isp_stat_unregister_entities(&isp->isp_af);
	omap3isp_stat_unregister_entities(&isp->isp_hist);

	v4l2_device_unregister(&isp->v4l2_dev);
	media_device_unregister(&isp->media_dev);
}

/*
 * isp_register_subdev_group - Register a group of subdevices
 * @isp: OMAP3 ISP device
 * @board_info: I2C subdevs board information array
 *
 * Register all I2C subdevices in the board_info array. The array must be
 * terminated by a NULL entry, and the first entry must be the sensor.
 *
 * Return a pointer to the sensor media entity if it has been successfully
 * registered, or NULL otherwise.
 */
static struct v4l2_subdev *
isp_register_subdev_group(struct isp_device *isp,
		     struct isp_subdev_i2c_board_info *board_info)
{
	struct v4l2_subdev *sensor = NULL;
	unsigned int first;

	if (board_info->board_info == NULL)
		return NULL;

	for (first = 1; board_info->board_info; ++board_info, first = 0) {
		struct v4l2_subdev *subdev;
		struct i2c_adapter *adapter;

		adapter = i2c_get_adapter(board_info->i2c_adapter_id);
		if (adapter == NULL) {
			dev_err(isp->dev, "%s: Unable to get I2C adapter %d for "
				"device %s\n", __func__,
				board_info->i2c_adapter_id,
				board_info->board_info->type);
			continue;
		}

		subdev = v4l2_i2c_new_subdev_board(&isp->v4l2_dev, adapter,
				board_info->board_info, NULL);
		if (subdev == NULL) {
			dev_err(isp->dev, "%s: Unable to register subdev %s\n",
				__func__, board_info->board_info->type);
			continue;
		}

		if (first)
			sensor = subdev;
	}

	return sensor;
}

static int isp_register_entities(struct isp_device *isp)
{
	struct isp_platform_data *pdata = isp->pdata;
	struct isp_v4l2_subdevs_group *subdevs;
	int ret;

	isp->media_dev.dev = isp->dev;
	strlcpy(isp->media_dev.model, "TI OMAP3 ISP",
		sizeof(isp->media_dev.model));
	isp->media_dev.hw_revision = isp->revision;
	isp->media_dev.link_notify = isp_pipeline_link_notify;
	ret = media_device_register(&isp->media_dev);
	if (ret < 0) {
		dev_err(isp->dev, "%s: Media device registration failed (%d)\n",
			__func__, ret);
		return ret;
	}

	isp->v4l2_dev.mdev = &isp->media_dev;
	ret = v4l2_device_register(isp->dev, &isp->v4l2_dev);
	if (ret < 0) {
		dev_err(isp->dev, "%s: V4L2 device registration failed (%d)\n",
			__func__, ret);
		goto done;
	}

	/* Register internal entities */
	ret = omap3isp_ccp2_register_entities(&isp->isp_ccp2, &isp->v4l2_dev);
	if (ret < 0)
		goto done;

	ret = omap3isp_csi2_register_entities(&isp->isp_csi2a, &isp->v4l2_dev);
	if (ret < 0)
		goto done;

	ret = omap3isp_ccdc_register_entities(&isp->isp_ccdc, &isp->v4l2_dev);
	if (ret < 0)
		goto done;

	ret = omap3isp_preview_register_entities(&isp->isp_prev,
						 &isp->v4l2_dev);
	if (ret < 0)
		goto done;

	ret = omap3isp_resizer_register_entities(&isp->isp_res, &isp->v4l2_dev);
	if (ret < 0)
		goto done;

	ret = omap3isp_stat_register_entities(&isp->isp_aewb, &isp->v4l2_dev);
	if (ret < 0)
		goto done;

	ret = omap3isp_stat_register_entities(&isp->isp_af, &isp->v4l2_dev);
	if (ret < 0)
		goto done;

	ret = omap3isp_stat_register_entities(&isp->isp_hist, &isp->v4l2_dev);
	if (ret < 0)
		goto done;

	/* Register external entities */
	for (subdevs = pdata->subdevs; subdevs && subdevs->subdevs; ++subdevs) {
		struct v4l2_subdev *sensor;
		struct media_entity *input;
		unsigned int flags;
		unsigned int pad;
		unsigned int i;

		sensor = isp_register_subdev_group(isp, subdevs->subdevs);
		if (sensor == NULL)
			continue;

		sensor->host_priv = subdevs;

		/* Connect the sensor to the correct interface module. Parallel
		 * sensors are connected directly to the CCDC, while serial
		 * sensors are connected to the CSI2a, CCP2b or CSI2c receiver
		 * through CSIPHY1 or CSIPHY2.
		 */
		switch (subdevs->interface) {
		case ISP_INTERFACE_PARALLEL:
			input = &isp->isp_ccdc.subdev.entity;
			pad = CCDC_PAD_SINK;
			flags = 0;
			break;

		case ISP_INTERFACE_CSI2A_PHY2:
			input = &isp->isp_csi2a.subdev.entity;
			pad = CSI2_PAD_SINK;
			flags = MEDIA_LNK_FL_IMMUTABLE
			      | MEDIA_LNK_FL_ENABLED;
			break;

		case ISP_INTERFACE_CCP2B_PHY1:
		case ISP_INTERFACE_CCP2B_PHY2:
			input = &isp->isp_ccp2.subdev.entity;
			pad = CCP2_PAD_SINK;
			flags = 0;
			break;

		case ISP_INTERFACE_CSI2C_PHY1:
			input = &isp->isp_csi2c.subdev.entity;
			pad = CSI2_PAD_SINK;
			flags = MEDIA_LNK_FL_IMMUTABLE
			      | MEDIA_LNK_FL_ENABLED;
			break;

		default:
			dev_err(isp->dev, "%s: invalid interface type %u\n",
				__func__, subdevs->interface);
			ret = -EINVAL;
			goto done;
		}

		for (i = 0; i < sensor->entity.num_pads; i++) {
			if (sensor->entity.pads[i].flags & MEDIA_PAD_FL_SOURCE)
				break;
		}
		if (i == sensor->entity.num_pads) {
			dev_err(isp->dev,
				"%s: no source pad in external entity\n",
				__func__);
			ret = -EINVAL;
			goto done;
		}

		ret = media_entity_create_link(&sensor->entity, i, input, pad,
					       flags);
		if (ret < 0)
			goto done;
	}

	ret = v4l2_device_register_subdev_nodes(&isp->v4l2_dev);

done:
	if (ret < 0)
		isp_unregister_entities(isp);

	return ret;
}

static void isp_cleanup_modules(struct isp_device *isp)
{
	omap3isp_h3a_aewb_cleanup(isp);
	omap3isp_h3a_af_cleanup(isp);
	omap3isp_hist_cleanup(isp);
	omap3isp_resizer_cleanup(isp);
	omap3isp_preview_cleanup(isp);
	omap3isp_ccdc_cleanup(isp);
	omap3isp_ccp2_cleanup(isp);
	omap3isp_csi2_cleanup(isp);
}

static int isp_initialize_modules(struct isp_device *isp)
{
	int ret;

	ret = omap3isp_csiphy_init(isp);
	if (ret < 0) {
		dev_err(isp->dev, "CSI PHY initialization failed\n");
		goto error_csiphy;
	}

	ret = omap3isp_csi2_init(isp);
	if (ret < 0) {
		dev_err(isp->dev, "CSI2 initialization failed\n");
		goto error_csi2;
	}

	ret = omap3isp_ccp2_init(isp);
	if (ret < 0) {
		dev_err(isp->dev, "CCP2 initialization failed\n");
		goto error_ccp2;
	}

	ret = omap3isp_ccdc_init(isp);
	if (ret < 0) {
		dev_err(isp->dev, "CCDC initialization failed\n");
		goto error_ccdc;
	}

	ret = omap3isp_preview_init(isp);
	if (ret < 0) {
		dev_err(isp->dev, "Preview initialization failed\n");
		goto error_preview;
	}

	ret = omap3isp_resizer_init(isp);
	if (ret < 0) {
		dev_err(isp->dev, "Resizer initialization failed\n");
		goto error_resizer;
	}

	ret = omap3isp_hist_init(isp);
	if (ret < 0) {
		dev_err(isp->dev, "Histogram initialization failed\n");
		goto error_hist;
	}

	ret = omap3isp_h3a_aewb_init(isp);
	if (ret < 0) {
		dev_err(isp->dev, "H3A AEWB initialization failed\n");
		goto error_h3a_aewb;
	}

	ret = omap3isp_h3a_af_init(isp);
	if (ret < 0) {
		dev_err(isp->dev, "H3A AF initialization failed\n");
		goto error_h3a_af;
	}

	/* Connect the submodules. */
	ret = media_entity_create_link(
			&isp->isp_csi2a.subdev.entity, CSI2_PAD_SOURCE,
			&isp->isp_ccdc.subdev.entity, CCDC_PAD_SINK, 0);
	if (ret < 0)
		goto error_link;

	ret = media_entity_create_link(
			&isp->isp_ccp2.subdev.entity, CCP2_PAD_SOURCE,
			&isp->isp_ccdc.subdev.entity, CCDC_PAD_SINK, 0);
	if (ret < 0)
		goto error_link;

	ret = media_entity_create_link(
			&isp->isp_ccdc.subdev.entity, CCDC_PAD_SOURCE_VP,
			&isp->isp_prev.subdev.entity, PREV_PAD_SINK, 0);
	if (ret < 0)
		goto error_link;

	ret = media_entity_create_link(
			&isp->isp_ccdc.subdev.entity, CCDC_PAD_SOURCE_OF,
			&isp->isp_res.subdev.entity, RESZ_PAD_SINK, 0);
	if (ret < 0)
		goto error_link;

	ret = media_entity_create_link(
			&isp->isp_prev.subdev.entity, PREV_PAD_SOURCE,
			&isp->isp_res.subdev.entity, RESZ_PAD_SINK, 0);
	if (ret < 0)
		goto error_link;

	ret = media_entity_create_link(
			&isp->isp_ccdc.subdev.entity, CCDC_PAD_SOURCE_VP,
			&isp->isp_aewb.subdev.entity, 0,
			MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE);
	if (ret < 0)
		goto error_link;

	ret = media_entity_create_link(
			&isp->isp_ccdc.subdev.entity, CCDC_PAD_SOURCE_VP,
			&isp->isp_af.subdev.entity, 0,
			MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE);
	if (ret < 0)
		goto error_link;

	ret = media_entity_create_link(
			&isp->isp_ccdc.subdev.entity, CCDC_PAD_SOURCE_VP,
			&isp->isp_hist.subdev.entity, 0,
			MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE);
	if (ret < 0)
		goto error_link;

	return 0;

error_link:
	omap3isp_h3a_af_cleanup(isp);
error_h3a_af:
	omap3isp_h3a_aewb_cleanup(isp);
error_h3a_aewb:
	omap3isp_hist_cleanup(isp);
error_hist:
	omap3isp_resizer_cleanup(isp);
error_resizer:
	omap3isp_preview_cleanup(isp);
error_preview:
	omap3isp_ccdc_cleanup(isp);
error_ccdc:
	omap3isp_ccp2_cleanup(isp);
error_ccp2:
	omap3isp_csi2_cleanup(isp);
error_csi2:
error_csiphy:
	return ret;
}

/*
 * isp_remove - Remove ISP platform device
 * @pdev: Pointer to ISP platform device
 *
 * Always returns 0.
 */
static int isp_remove(struct platform_device *pdev)
{
	struct isp_device *isp = platform_get_drvdata(pdev);

	isp_unregister_entities(isp);
	isp_cleanup_modules(isp);
	isp_xclk_cleanup(isp);

	__omap3isp_get(isp, false);
	iommu_detach_device(isp->domain, &pdev->dev);
	iommu_domain_free(isp->domain);
	isp->domain = NULL;
	omap3isp_put(isp);

	return 0;
}

static int isp_map_mem_resource(struct platform_device *pdev,
				struct isp_device *isp,
				enum isp_mem_resources res)
{
	struct resource *mem;

	/* request the mem region for the camera registers */

	mem = platform_get_resource(pdev, IORESOURCE_MEM, res);
	if (!mem) {
		dev_err(isp->dev, "no mem resource?\n");
		return -ENODEV;
	}

	if (!devm_request_mem_region(isp->dev, mem->start, resource_size(mem),
				     pdev->name)) {
		dev_err(isp->dev,
			"cannot reserve camera register I/O region\n");
		return -ENODEV;
	}
	isp->mmio_base_phys[res] = mem->start;
	isp->mmio_size[res] = resource_size(mem);

	/* map the region */
	isp->mmio_base[res] = devm_ioremap_nocache(isp->dev,
						   isp->mmio_base_phys[res],
						   isp->mmio_size[res]);
	if (!isp->mmio_base[res]) {
		dev_err(isp->dev, "cannot map camera register I/O region\n");
		return -ENODEV;
	}

	return 0;
}

/*
 * isp_probe - Probe ISP platform device
 * @pdev: Pointer to ISP platform device
 *
 * Returns 0 if successful,
 *   -ENOMEM if no memory available,
 *   -ENODEV if no platform device resources found
 *     or no space for remapping registers,
 *   -EINVAL if couldn't install ISR,
 *   or clk_get return error value.
 */
static int isp_probe(struct platform_device *pdev)
{
	struct isp_platform_data *pdata = pdev->dev.platform_data;
	struct isp_device *isp;
	int ret;
	int i, m;

	if (pdata == NULL)
		return -EINVAL;

	isp = devm_kzalloc(&pdev->dev, sizeof(*isp), GFP_KERNEL);
	if (!isp) {
		dev_err(&pdev->dev, "could not allocate memory\n");
		return -ENOMEM;
	}

	isp->autoidle = autoidle;

	mutex_init(&isp->isp_mutex);
	spin_lock_init(&isp->stat_lock);

	isp->dev = &pdev->dev;
	isp->pdata = pdata;
	isp->ref_count = 0;

	isp->raw_dmamask = DMA_BIT_MASK(32);
	isp->dev->dma_mask = &isp->raw_dmamask;
	isp->dev->coherent_dma_mask = DMA_BIT_MASK(32);

	platform_set_drvdata(pdev, isp);

	/* Regulators */
	isp->isp_csiphy1.vdd = devm_regulator_get(&pdev->dev, "VDD_CSIPHY1");
	isp->isp_csiphy2.vdd = devm_regulator_get(&pdev->dev, "VDD_CSIPHY2");

	/* Clocks
	 *
	 * The ISP clock tree is revision-dependent. We thus need to enable ICLK
	 * manually to read the revision before calling __omap3isp_get().
	 */
	ret = isp_map_mem_resource(pdev, isp, OMAP3_ISP_IOMEM_MAIN);
	if (ret < 0)
		goto error;

	ret = isp_get_clocks(isp);
	if (ret < 0)
		goto error;

	ret = clk_enable(isp->clock[ISP_CLK_CAM_ICK]);
	if (ret < 0)
		goto error;

	isp->revision = isp_reg_readl(isp, OMAP3_ISP_IOMEM_MAIN, ISP_REVISION);
	dev_info(isp->dev, "Revision %d.%d found\n",
		 (isp->revision & 0xf0) >> 4, isp->revision & 0x0f);

	clk_disable(isp->clock[ISP_CLK_CAM_ICK]);

	if (__omap3isp_get(isp, false) == NULL) {
		ret = -ENODEV;
		goto error;
	}

	ret = isp_reset(isp);
	if (ret < 0)
		goto error_isp;

	ret = isp_xclk_init(isp);
	if (ret < 0)
		goto error_isp;

	/* Memory resources */
	for (m = 0; m < ARRAY_SIZE(isp_res_maps); m++)
		if (isp->revision == isp_res_maps[m].isp_rev)
			break;

	if (m == ARRAY_SIZE(isp_res_maps)) {
		dev_err(isp->dev, "No resource map found for ISP rev %d.%d\n",
			(isp->revision & 0xf0) >> 4, isp->revision & 0xf);
		ret = -ENODEV;
		goto error_isp;
	}

	for (i = 1; i < OMAP3_ISP_IOMEM_LAST; i++) {
		if (isp_res_maps[m].map & 1 << i) {
			ret = isp_map_mem_resource(pdev, isp, i);
			if (ret)
				goto error_isp;
		}
	}

	isp->domain = iommu_domain_alloc(pdev->dev.bus);
	if (!isp->domain) {
		dev_err(isp->dev, "can't alloc iommu domain\n");
		ret = -ENOMEM;
		goto error_isp;
	}

	ret = iommu_attach_device(isp->domain, &pdev->dev);
	if (ret) {
		dev_err(&pdev->dev, "can't attach iommu device: %d\n", ret);
		goto free_domain;
	}

	/* Interrupt */
	isp->irq_num = platform_get_irq(pdev, 0);
	if (isp->irq_num <= 0) {
		dev_err(isp->dev, "No IRQ resource\n");
		ret = -ENODEV;
		goto detach_dev;
	}

	if (devm_request_irq(isp->dev, isp->irq_num, isp_isr, IRQF_SHARED,
			     "OMAP3 ISP", isp)) {
		dev_err(isp->dev, "Unable to request IRQ\n");
		ret = -EINVAL;
		goto detach_dev;
	}

	/* Entities */
	ret = isp_initialize_modules(isp);
	if (ret < 0)
		goto detach_dev;

	ret = isp_register_entities(isp);
	if (ret < 0)
		goto error_modules;

	isp_core_init(isp, 1);
	omap3isp_put(isp);

	return 0;

error_modules:
	isp_cleanup_modules(isp);
detach_dev:
	iommu_detach_device(isp->domain, &pdev->dev);
free_domain:
	iommu_domain_free(isp->domain);
error_isp:
	isp_xclk_cleanup(isp);
	omap3isp_put(isp);
error:
	platform_set_drvdata(pdev, NULL);

	mutex_destroy(&isp->isp_mutex);

	return ret;
}

static const struct dev_pm_ops omap3isp_pm_ops = {
	.prepare = isp_pm_prepare,
	.suspend = isp_pm_suspend,
	.resume = isp_pm_resume,
	.complete = isp_pm_complete,
};

static struct platform_device_id omap3isp_id_table[] = {
	{ "omap3isp", 0 },
	{ },
};
MODULE_DEVICE_TABLE(platform, omap3isp_id_table);

static struct platform_driver omap3isp_driver = {
	.probe = isp_probe,
	.remove = isp_remove,
	.id_table = omap3isp_id_table,
	.driver = {
		.owner = THIS_MODULE,
		.name = "omap3isp",
		.pm	= &omap3isp_pm_ops,
	},
};

module_platform_driver(omap3isp_driver);

MODULE_AUTHOR("Nokia Corporation");
MODULE_DESCRIPTION("TI OMAP3 ISP driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(ISP_VIDEO_DRIVER_VERSION);