summaryrefslogtreecommitdiff
path: root/drivers/dma/xilinx/xilinx_dma.c
blob: 5eef13380ca8e8a2204c7aa5d4c49eb4395621f3 (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
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
/*
 * DMA driver for Xilinx Video DMA Engine
 *
 * Copyright (C) 2010-2014 Xilinx, Inc. All rights reserved.
 *
 * Based on the Freescale DMA driver.
 *
 * Description:
 * The AXI Video Direct Memory Access (AXI VDMA) core is a soft Xilinx IP
 * core that provides high-bandwidth direct memory access between memory
 * and AXI4-Stream type video target peripherals. The core provides efficient
 * two dimensional DMA operations with independent asynchronous read (S2MM)
 * and write (MM2S) channel operation. It can be configured to have either
 * one channel or two channels. If configured as two channels, one is to
 * transmit to the video device (MM2S) and another is to receive from the
 * video device (S2MM). Initialization, status, interrupt and management
 * registers are accessed through an AXI4-Lite slave interface.
 *
 * The AXI Direct Memory Access (AXI DMA) core is a soft Xilinx IP core that
 * provides high-bandwidth one dimensional direct memory access between memory
 * and AXI4-Stream target peripherals. It supports one receive and one
 * transmit channel, both of them optional at synthesis time.
 *
 * The AXI CDMA, is a soft IP, which provides high-bandwidth Direct Memory
 * Access (DMA) between a memory-mapped source address and a memory-mapped
 * destination address.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/bitops.h>
#include <linux/dmapool.h>
#include <linux/dma/xilinx_dma.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_dma.h>
#include <linux/of_platform.h>
#include <linux/of_irq.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/io-64-nonatomic-lo-hi.h>

#include "../dmaengine.h"

/* Register/Descriptor Offsets */
#define XILINX_DMA_MM2S_CTRL_OFFSET		0x0000
#define XILINX_DMA_S2MM_CTRL_OFFSET		0x0030
#define XILINX_VDMA_MM2S_DESC_OFFSET		0x0050
#define XILINX_VDMA_S2MM_DESC_OFFSET		0x00a0

/* Control Registers */
#define XILINX_DMA_REG_DMACR			0x0000
#define XILINX_DMA_DMACR_DELAY_MAX		0xff
#define XILINX_DMA_DMACR_DELAY_SHIFT		24
#define XILINX_DMA_DMACR_FRAME_COUNT_MAX	0xff
#define XILINX_DMA_DMACR_FRAME_COUNT_SHIFT	16
#define XILINX_DMA_DMACR_ERR_IRQ		BIT(14)
#define XILINX_DMA_DMACR_DLY_CNT_IRQ		BIT(13)
#define XILINX_DMA_DMACR_FRM_CNT_IRQ		BIT(12)
#define XILINX_DMA_DMACR_MASTER_SHIFT		8
#define XILINX_DMA_DMACR_FSYNCSRC_SHIFT	5
#define XILINX_DMA_DMACR_FRAMECNT_EN		BIT(4)
#define XILINX_DMA_DMACR_GENLOCK_EN		BIT(3)
#define XILINX_DMA_DMACR_RESET			BIT(2)
#define XILINX_DMA_DMACR_CIRC_EN		BIT(1)
#define XILINX_DMA_DMACR_RUNSTOP		BIT(0)
#define XILINX_DMA_DMACR_FSYNCSRC_MASK		GENMASK(6, 5)

#define XILINX_DMA_REG_DMASR			0x0004
#define XILINX_DMA_DMASR_EOL_LATE_ERR		BIT(15)
#define XILINX_DMA_DMASR_ERR_IRQ		BIT(14)
#define XILINX_DMA_DMASR_DLY_CNT_IRQ		BIT(13)
#define XILINX_DMA_DMASR_FRM_CNT_IRQ		BIT(12)
#define XILINX_DMA_DMASR_SOF_LATE_ERR		BIT(11)
#define XILINX_DMA_DMASR_SG_DEC_ERR		BIT(10)
#define XILINX_DMA_DMASR_SG_SLV_ERR		BIT(9)
#define XILINX_DMA_DMASR_EOF_EARLY_ERR		BIT(8)
#define XILINX_DMA_DMASR_SOF_EARLY_ERR		BIT(7)
#define XILINX_DMA_DMASR_DMA_DEC_ERR		BIT(6)
#define XILINX_DMA_DMASR_DMA_SLAVE_ERR		BIT(5)
#define XILINX_DMA_DMASR_DMA_INT_ERR		BIT(4)
#define XILINX_DMA_DMASR_IDLE			BIT(1)
#define XILINX_DMA_DMASR_HALTED		BIT(0)
#define XILINX_DMA_DMASR_DELAY_MASK		GENMASK(31, 24)
#define XILINX_DMA_DMASR_FRAME_COUNT_MASK	GENMASK(23, 16)

#define XILINX_DMA_REG_CURDESC			0x0008
#define XILINX_DMA_REG_TAILDESC		0x0010
#define XILINX_DMA_REG_REG_INDEX		0x0014
#define XILINX_DMA_REG_FRMSTORE		0x0018
#define XILINX_DMA_REG_THRESHOLD		0x001c
#define XILINX_DMA_REG_FRMPTR_STS		0x0024
#define XILINX_DMA_REG_PARK_PTR		0x0028
#define XILINX_DMA_PARK_PTR_WR_REF_SHIFT	8
#define XILINX_DMA_PARK_PTR_RD_REF_SHIFT	0
#define XILINX_DMA_REG_VDMA_VERSION		0x002c

/* Register Direct Mode Registers */
#define XILINX_DMA_REG_VSIZE			0x0000
#define XILINX_DMA_REG_HSIZE			0x0004

#define XILINX_DMA_REG_FRMDLY_STRIDE		0x0008
#define XILINX_DMA_FRMDLY_STRIDE_FRMDLY_SHIFT	24
#define XILINX_DMA_FRMDLY_STRIDE_STRIDE_SHIFT	0

#define XILINX_VDMA_REG_START_ADDRESS(n)	(0x000c + 4 * (n))
#define XILINX_VDMA_REG_START_ADDRESS_64(n)	(0x000c + 8 * (n))

/* HW specific definitions */
#define XILINX_DMA_MAX_CHANS_PER_DEVICE	0x20

#define XILINX_DMA_DMAXR_ALL_IRQ_MASK	\
		(XILINX_DMA_DMASR_FRM_CNT_IRQ | \
		 XILINX_DMA_DMASR_DLY_CNT_IRQ | \
		 XILINX_DMA_DMASR_ERR_IRQ)

#define XILINX_DMA_DMASR_ALL_ERR_MASK	\
		(XILINX_DMA_DMASR_EOL_LATE_ERR | \
		 XILINX_DMA_DMASR_SOF_LATE_ERR | \
		 XILINX_DMA_DMASR_SG_DEC_ERR | \
		 XILINX_DMA_DMASR_SG_SLV_ERR | \
		 XILINX_DMA_DMASR_EOF_EARLY_ERR | \
		 XILINX_DMA_DMASR_SOF_EARLY_ERR | \
		 XILINX_DMA_DMASR_DMA_DEC_ERR | \
		 XILINX_DMA_DMASR_DMA_SLAVE_ERR | \
		 XILINX_DMA_DMASR_DMA_INT_ERR)

/*
 * Recoverable errors are DMA Internal error, SOF Early, EOF Early
 * and SOF Late. They are only recoverable when C_FLUSH_ON_FSYNC
 * is enabled in the h/w system.
 */
#define XILINX_DMA_DMASR_ERR_RECOVER_MASK	\
		(XILINX_DMA_DMASR_SOF_LATE_ERR | \
		 XILINX_DMA_DMASR_EOF_EARLY_ERR | \
		 XILINX_DMA_DMASR_SOF_EARLY_ERR | \
		 XILINX_DMA_DMASR_DMA_INT_ERR)

/* Axi VDMA Flush on Fsync bits */
#define XILINX_DMA_FLUSH_S2MM		3
#define XILINX_DMA_FLUSH_MM2S		2
#define XILINX_DMA_FLUSH_BOTH		1

/* Delay loop counter to prevent hardware failure */
#define XILINX_DMA_LOOP_COUNT		1000000

/* AXI DMA Specific Registers/Offsets */
#define XILINX_DMA_REG_SRCDSTADDR	0x18
#define XILINX_DMA_REG_BTT		0x28

/* AXI DMA Specific Masks/Bit fields */
#define XILINX_DMA_MAX_TRANS_LEN	GENMASK(22, 0)
#define XILINX_DMA_CR_COALESCE_MAX	GENMASK(23, 16)
#define XILINX_DMA_CR_CYCLIC_BD_EN_MASK	BIT(4)
#define XILINX_DMA_CR_COALESCE_SHIFT	16
#define XILINX_DMA_BD_SOP		BIT(27)
#define XILINX_DMA_BD_EOP		BIT(26)
#define XILINX_DMA_COALESCE_MAX		255
#define XILINX_DMA_NUM_APP_WORDS	5

/* Multi-Channel DMA Descriptor offsets*/
#define XILINX_DMA_MCRX_CDESC(x)	(0x40 + (x-1) * 0x20)
#define XILINX_DMA_MCRX_TDESC(x)	(0x48 + (x-1) * 0x20)

/* Multi-Channel DMA Masks/Shifts */
#define XILINX_DMA_BD_HSIZE_MASK	GENMASK(15, 0)
#define XILINX_DMA_BD_STRIDE_MASK	GENMASK(15, 0)
#define XILINX_DMA_BD_VSIZE_MASK	GENMASK(31, 19)
#define XILINX_DMA_BD_TDEST_MASK	GENMASK(4, 0)
#define XILINX_DMA_BD_STRIDE_SHIFT	0
#define XILINX_DMA_BD_VSIZE_SHIFT	19

/* AXI CDMA Specific Registers/Offsets */
#define XILINX_CDMA_REG_SRCADDR		0x18
#define XILINX_CDMA_REG_DSTADDR		0x20

/* AXI CDMA Specific Masks */
#define XILINX_CDMA_CR_SGMODE          BIT(3)

/**
 * struct xilinx_vdma_desc_hw - Hardware Descriptor
 * @next_desc: Next Descriptor Pointer @0x00
 * @pad1: Reserved @0x04
 * @buf_addr: Buffer address @0x08
 * @buf_addr_msb: MSB of Buffer address @0x0C
 * @vsize: Vertical Size @0x10
 * @hsize: Horizontal Size @0x14
 * @stride: Number of bytes between the first
 *	    pixels of each horizontal line @0x18
 */
struct xilinx_vdma_desc_hw {
	u32 next_desc;
	u32 pad1;
	u32 buf_addr;
	u32 buf_addr_msb;
	u32 vsize;
	u32 hsize;
	u32 stride;
} __aligned(64);

/**
 * struct xilinx_axidma_desc_hw - Hardware Descriptor for AXI DMA
 * @next_desc: Next Descriptor Pointer @0x00
 * @next_desc_msb: MSB of Next Descriptor Pointer @0x04
 * @buf_addr: Buffer address @0x08
 * @buf_addr_msb: MSB of Buffer address @0x0C
 * @pad1: Reserved @0x10
 * @pad2: Reserved @0x14
 * @control: Control field @0x18
 * @status: Status field @0x1C
 * @app: APP Fields @0x20 - 0x30
 */
struct xilinx_axidma_desc_hw {
	u32 next_desc;
	u32 next_desc_msb;
	u32 buf_addr;
	u32 buf_addr_msb;
	u32 mcdma_control;
	u32 vsize_stride;
	u32 control;
	u32 status;
	u32 app[XILINX_DMA_NUM_APP_WORDS];
} __aligned(64);

/**
 * struct xilinx_cdma_desc_hw - Hardware Descriptor
 * @next_desc: Next Descriptor Pointer @0x00
 * @next_descmsb: Next Descriptor Pointer MSB @0x04
 * @src_addr: Source address @0x08
 * @src_addrmsb: Source address MSB @0x0C
 * @dest_addr: Destination address @0x10
 * @dest_addrmsb: Destination address MSB @0x14
 * @control: Control field @0x18
 * @status: Status field @0x1C
 */
struct xilinx_cdma_desc_hw {
	u32 next_desc;
	u32 next_desc_msb;
	u32 src_addr;
	u32 src_addr_msb;
	u32 dest_addr;
	u32 dest_addr_msb;
	u32 control;
	u32 status;
} __aligned(64);

/**
 * struct xilinx_vdma_tx_segment - Descriptor segment
 * @hw: Hardware descriptor
 * @node: Node in the descriptor segments list
 * @phys: Physical address of segment
 */
struct xilinx_vdma_tx_segment {
	struct xilinx_vdma_desc_hw hw;
	struct list_head node;
	dma_addr_t phys;
} __aligned(64);

/**
 * struct xilinx_axidma_tx_segment - Descriptor segment
 * @hw: Hardware descriptor
 * @node: Node in the descriptor segments list
 * @phys: Physical address of segment
 */
struct xilinx_axidma_tx_segment {
	struct xilinx_axidma_desc_hw hw;
	struct list_head node;
	dma_addr_t phys;
} __aligned(64);

/**
 * struct xilinx_cdma_tx_segment - Descriptor segment
 * @hw: Hardware descriptor
 * @node: Node in the descriptor segments list
 * @phys: Physical address of segment
 */
struct xilinx_cdma_tx_segment {
	struct xilinx_cdma_desc_hw hw;
	struct list_head node;
	dma_addr_t phys;
} __aligned(64);

/**
 * struct xilinx_dma_tx_descriptor - Per Transaction structure
 * @async_tx: Async transaction descriptor
 * @segments: TX segments list
 * @node: Node in the channel descriptors list
 * @cyclic: Check for cyclic transfers.
 */
struct xilinx_dma_tx_descriptor {
	struct dma_async_tx_descriptor async_tx;
	struct list_head segments;
	struct list_head node;
	bool cyclic;
};

/**
 * struct xilinx_dma_chan - Driver specific DMA channel structure
 * @xdev: Driver specific device structure
 * @ctrl_offset: Control registers offset
 * @desc_offset: TX descriptor registers offset
 * @lock: Descriptor operation lock
 * @pending_list: Descriptors waiting
 * @active_list: Descriptors ready to submit
 * @done_list: Complete descriptors
 * @common: DMA common channel
 * @desc_pool: Descriptors pool
 * @dev: The dma device
 * @irq: Channel IRQ
 * @id: Channel ID
 * @direction: Transfer direction
 * @num_frms: Number of frames
 * @has_sg: Support scatter transfers
 * @cyclic: Check for cyclic transfers.
 * @genlock: Support genlock mode
 * @err: Channel has errors
 * @tasklet: Cleanup work after irq
 * @config: Device configuration info
 * @flush_on_fsync: Flush on Frame sync
 * @desc_pendingcount: Descriptor pending count
 * @ext_addr: Indicates 64 bit addressing is supported by dma channel
 * @desc_submitcount: Descriptor h/w submitted count
 * @residue: Residue for AXI DMA
 * @seg_v: Statically allocated segments base
 * @cyclic_seg_v: Statically allocated segment base for cyclic transfers
 * @start_transfer: Differentiate b/w DMA IP's transfer
 * @stop_transfer: Differentiate b/w DMA IP's quiesce
 */
struct xilinx_dma_chan {
	struct xilinx_dma_device *xdev;
	u32 ctrl_offset;
	u32 desc_offset;
	spinlock_t lock;
	struct list_head pending_list;
	struct list_head active_list;
	struct list_head done_list;
	struct dma_chan common;
	struct dma_pool *desc_pool;
	struct device *dev;
	int irq;
	int id;
	enum dma_transfer_direction direction;
	int num_frms;
	bool has_sg;
	bool cyclic;
	bool genlock;
	bool err;
	struct tasklet_struct tasklet;
	struct xilinx_vdma_config config;
	bool flush_on_fsync;
	u32 desc_pendingcount;
	bool ext_addr;
	u32 desc_submitcount;
	u32 residue;
	struct xilinx_axidma_tx_segment *seg_v;
	struct xilinx_axidma_tx_segment *cyclic_seg_v;
	void (*start_transfer)(struct xilinx_dma_chan *chan);
	int (*stop_transfer)(struct xilinx_dma_chan *chan);
	u16 tdest;
};

/**
 * enum xdma_ip_type: DMA IP type.
 *
 * XDMA_TYPE_AXIDMA: Axi dma ip.
 * XDMA_TYPE_CDMA: Axi cdma ip.
 * XDMA_TYPE_VDMA: Axi vdma ip.
 *
 */
enum xdma_ip_type {
	XDMA_TYPE_AXIDMA = 0,
	XDMA_TYPE_CDMA,
	XDMA_TYPE_VDMA,
};

struct xilinx_dma_config {
	enum xdma_ip_type dmatype;
	int (*clk_init)(struct platform_device *pdev, struct clk **axi_clk,
			struct clk **tx_clk, struct clk **txs_clk,
			struct clk **rx_clk, struct clk **rxs_clk);
};

/**
 * struct xilinx_dma_device - DMA device structure
 * @regs: I/O mapped base address
 * @dev: Device Structure
 * @common: DMA device structure
 * @chan: Driver specific DMA channel
 * @has_sg: Specifies whether Scatter-Gather is present or not
 * @mcdma: Specifies whether Multi-Channel is present or not
 * @flush_on_fsync: Flush on frame sync
 * @ext_addr: Indicates 64 bit addressing is supported by dma device
 * @pdev: Platform device structure pointer
 * @dma_config: DMA config structure
 * @axi_clk: DMA Axi4-lite interace clock
 * @tx_clk: DMA mm2s clock
 * @txs_clk: DMA mm2s stream clock
 * @rx_clk: DMA s2mm clock
 * @rxs_clk: DMA s2mm stream clock
 * @nr_channels: Number of channels DMA device supports
 * @chan_id: DMA channel identifier
 */
struct xilinx_dma_device {
	void __iomem *regs;
	struct device *dev;
	struct dma_device common;
	struct xilinx_dma_chan *chan[XILINX_DMA_MAX_CHANS_PER_DEVICE];
	bool has_sg;
	bool mcdma;
	u32 flush_on_fsync;
	bool ext_addr;
	struct platform_device  *pdev;
	const struct xilinx_dma_config *dma_config;
	struct clk *axi_clk;
	struct clk *tx_clk;
	struct clk *txs_clk;
	struct clk *rx_clk;
	struct clk *rxs_clk;
	u32 nr_channels;
	u32 chan_id;
};

/* Macros */
#define to_xilinx_chan(chan) \
	container_of(chan, struct xilinx_dma_chan, common)
#define to_dma_tx_descriptor(tx) \
	container_of(tx, struct xilinx_dma_tx_descriptor, async_tx)
#define xilinx_dma_poll_timeout(chan, reg, val, cond, delay_us, timeout_us) \
	readl_poll_timeout(chan->xdev->regs + chan->ctrl_offset + reg, val, \
			   cond, delay_us, timeout_us)

/* IO accessors */
static inline u32 dma_read(struct xilinx_dma_chan *chan, u32 reg)
{
	return ioread32(chan->xdev->regs + reg);
}

static inline void dma_write(struct xilinx_dma_chan *chan, u32 reg, u32 value)
{
	iowrite32(value, chan->xdev->regs + reg);
}

static inline void vdma_desc_write(struct xilinx_dma_chan *chan, u32 reg,
				   u32 value)
{
	dma_write(chan, chan->desc_offset + reg, value);
}

static inline u32 dma_ctrl_read(struct xilinx_dma_chan *chan, u32 reg)
{
	return dma_read(chan, chan->ctrl_offset + reg);
}

static inline void dma_ctrl_write(struct xilinx_dma_chan *chan, u32 reg,
				   u32 value)
{
	dma_write(chan, chan->ctrl_offset + reg, value);
}

static inline void dma_ctrl_clr(struct xilinx_dma_chan *chan, u32 reg,
				 u32 clr)
{
	dma_ctrl_write(chan, reg, dma_ctrl_read(chan, reg) & ~clr);
}

static inline void dma_ctrl_set(struct xilinx_dma_chan *chan, u32 reg,
				 u32 set)
{
	dma_ctrl_write(chan, reg, dma_ctrl_read(chan, reg) | set);
}

/**
 * vdma_desc_write_64 - 64-bit descriptor write
 * @chan: Driver specific VDMA channel
 * @reg: Register to write
 * @value_lsb: lower address of the descriptor.
 * @value_msb: upper address of the descriptor.
 *
 * Since vdma driver is trying to write to a register offset which is not a
 * multiple of 64 bits(ex : 0x5c), we are writing as two separate 32 bits
 * instead of a single 64 bit register write.
 */
static inline void vdma_desc_write_64(struct xilinx_dma_chan *chan, u32 reg,
				      u32 value_lsb, u32 value_msb)
{
	/* Write the lsb 32 bits*/
	writel(value_lsb, chan->xdev->regs + chan->desc_offset + reg);

	/* Write the msb 32 bits */
	writel(value_msb, chan->xdev->regs + chan->desc_offset + reg + 4);
}

static inline void dma_writeq(struct xilinx_dma_chan *chan, u32 reg, u64 value)
{
	lo_hi_writeq(value, chan->xdev->regs + chan->ctrl_offset + reg);
}

static inline void xilinx_write(struct xilinx_dma_chan *chan, u32 reg,
				dma_addr_t addr)
{
	if (chan->ext_addr)
		dma_writeq(chan, reg, addr);
	else
		dma_ctrl_write(chan, reg, addr);
}

static inline void xilinx_axidma_buf(struct xilinx_dma_chan *chan,
				     struct xilinx_axidma_desc_hw *hw,
				     dma_addr_t buf_addr, size_t sg_used,
				     size_t period_len)
{
	if (chan->ext_addr) {
		hw->buf_addr = lower_32_bits(buf_addr + sg_used + period_len);
		hw->buf_addr_msb = upper_32_bits(buf_addr + sg_used +
						 period_len);
	} else {
		hw->buf_addr = buf_addr + sg_used + period_len;
	}
}

/* -----------------------------------------------------------------------------
 * Descriptors and segments alloc and free
 */

/**
 * xilinx_vdma_alloc_tx_segment - Allocate transaction segment
 * @chan: Driver specific DMA channel
 *
 * Return: The allocated segment on success and NULL on failure.
 */
static struct xilinx_vdma_tx_segment *
xilinx_vdma_alloc_tx_segment(struct xilinx_dma_chan *chan)
{
	struct xilinx_vdma_tx_segment *segment;
	dma_addr_t phys;

	segment = dma_pool_zalloc(chan->desc_pool, GFP_ATOMIC, &phys);
	if (!segment)
		return NULL;

	segment->phys = phys;

	return segment;
}

/**
 * xilinx_cdma_alloc_tx_segment - Allocate transaction segment
 * @chan: Driver specific DMA channel
 *
 * Return: The allocated segment on success and NULL on failure.
 */
static struct xilinx_cdma_tx_segment *
xilinx_cdma_alloc_tx_segment(struct xilinx_dma_chan *chan)
{
	struct xilinx_cdma_tx_segment *segment;
	dma_addr_t phys;

	segment = dma_pool_zalloc(chan->desc_pool, GFP_ATOMIC, &phys);
	if (!segment)
		return NULL;

	segment->phys = phys;

	return segment;
}

/**
 * xilinx_axidma_alloc_tx_segment - Allocate transaction segment
 * @chan: Driver specific DMA channel
 *
 * Return: The allocated segment on success and NULL on failure.
 */
static struct xilinx_axidma_tx_segment *
xilinx_axidma_alloc_tx_segment(struct xilinx_dma_chan *chan)
{
	struct xilinx_axidma_tx_segment *segment;
	dma_addr_t phys;

	segment = dma_pool_zalloc(chan->desc_pool, GFP_ATOMIC, &phys);
	if (!segment)
		return NULL;

	segment->phys = phys;

	return segment;
}

/**
 * xilinx_dma_free_tx_segment - Free transaction segment
 * @chan: Driver specific DMA channel
 * @segment: DMA transaction segment
 */
static void xilinx_dma_free_tx_segment(struct xilinx_dma_chan *chan,
				struct xilinx_axidma_tx_segment *segment)
{
	dma_pool_free(chan->desc_pool, segment, segment->phys);
}

/**
 * xilinx_cdma_free_tx_segment - Free transaction segment
 * @chan: Driver specific DMA channel
 * @segment: DMA transaction segment
 */
static void xilinx_cdma_free_tx_segment(struct xilinx_dma_chan *chan,
				struct xilinx_cdma_tx_segment *segment)
{
	dma_pool_free(chan->desc_pool, segment, segment->phys);
}

/**
 * xilinx_vdma_free_tx_segment - Free transaction segment
 * @chan: Driver specific DMA channel
 * @segment: DMA transaction segment
 */
static void xilinx_vdma_free_tx_segment(struct xilinx_dma_chan *chan,
					struct xilinx_vdma_tx_segment *segment)
{
	dma_pool_free(chan->desc_pool, segment, segment->phys);
}

/**
 * xilinx_dma_tx_descriptor - Allocate transaction descriptor
 * @chan: Driver specific DMA channel
 *
 * Return: The allocated descriptor on success and NULL on failure.
 */
static struct xilinx_dma_tx_descriptor *
xilinx_dma_alloc_tx_descriptor(struct xilinx_dma_chan *chan)
{
	struct xilinx_dma_tx_descriptor *desc;

	desc = kzalloc(sizeof(*desc), GFP_KERNEL);
	if (!desc)
		return NULL;

	INIT_LIST_HEAD(&desc->segments);

	return desc;
}

/**
 * xilinx_dma_free_tx_descriptor - Free transaction descriptor
 * @chan: Driver specific DMA channel
 * @desc: DMA transaction descriptor
 */
static void
xilinx_dma_free_tx_descriptor(struct xilinx_dma_chan *chan,
			       struct xilinx_dma_tx_descriptor *desc)
{
	struct xilinx_vdma_tx_segment *segment, *next;
	struct xilinx_cdma_tx_segment *cdma_segment, *cdma_next;
	struct xilinx_axidma_tx_segment *axidma_segment, *axidma_next;

	if (!desc)
		return;

	if (chan->xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
		list_for_each_entry_safe(segment, next, &desc->segments, node) {
			list_del(&segment->node);
			xilinx_vdma_free_tx_segment(chan, segment);
		}
	} else if (chan->xdev->dma_config->dmatype == XDMA_TYPE_CDMA) {
		list_for_each_entry_safe(cdma_segment, cdma_next,
					 &desc->segments, node) {
			list_del(&cdma_segment->node);
			xilinx_cdma_free_tx_segment(chan, cdma_segment);
		}
	} else {
		list_for_each_entry_safe(axidma_segment, axidma_next,
					 &desc->segments, node) {
			list_del(&axidma_segment->node);
			xilinx_dma_free_tx_segment(chan, axidma_segment);
		}
	}

	kfree(desc);
}

/* Required functions */

/**
 * xilinx_dma_free_desc_list - Free descriptors list
 * @chan: Driver specific DMA channel
 * @list: List to parse and delete the descriptor
 */
static void xilinx_dma_free_desc_list(struct xilinx_dma_chan *chan,
					struct list_head *list)
{
	struct xilinx_dma_tx_descriptor *desc, *next;

	list_for_each_entry_safe(desc, next, list, node) {
		list_del(&desc->node);
		xilinx_dma_free_tx_descriptor(chan, desc);
	}
}

/**
 * xilinx_dma_free_descriptors - Free channel descriptors
 * @chan: Driver specific DMA channel
 */
static void xilinx_dma_free_descriptors(struct xilinx_dma_chan *chan)
{
	unsigned long flags;

	spin_lock_irqsave(&chan->lock, flags);

	xilinx_dma_free_desc_list(chan, &chan->pending_list);
	xilinx_dma_free_desc_list(chan, &chan->done_list);
	xilinx_dma_free_desc_list(chan, &chan->active_list);

	spin_unlock_irqrestore(&chan->lock, flags);
}

/**
 * xilinx_dma_free_chan_resources - Free channel resources
 * @dchan: DMA channel
 */
static void xilinx_dma_free_chan_resources(struct dma_chan *dchan)
{
	struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);

	dev_dbg(chan->dev, "Free all channel resources.\n");

	xilinx_dma_free_descriptors(chan);
	if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
		xilinx_dma_free_tx_segment(chan, chan->cyclic_seg_v);
		xilinx_dma_free_tx_segment(chan, chan->seg_v);
	}
	dma_pool_destroy(chan->desc_pool);
	chan->desc_pool = NULL;
}

/**
 * xilinx_dma_chan_handle_cyclic - Cyclic dma callback
 * @chan: Driver specific dma channel
 * @desc: dma transaction descriptor
 * @flags: flags for spin lock
 */
static void xilinx_dma_chan_handle_cyclic(struct xilinx_dma_chan *chan,
					  struct xilinx_dma_tx_descriptor *desc,
					  unsigned long *flags)
{
	dma_async_tx_callback callback;
	void *callback_param;

	callback = desc->async_tx.callback;
	callback_param = desc->async_tx.callback_param;
	if (callback) {
		spin_unlock_irqrestore(&chan->lock, *flags);
		callback(callback_param);
		spin_lock_irqsave(&chan->lock, *flags);
	}
}

/**
 * xilinx_dma_chan_desc_cleanup - Clean channel descriptors
 * @chan: Driver specific DMA channel
 */
static void xilinx_dma_chan_desc_cleanup(struct xilinx_dma_chan *chan)
{
	struct xilinx_dma_tx_descriptor *desc, *next;
	unsigned long flags;

	spin_lock_irqsave(&chan->lock, flags);

	list_for_each_entry_safe(desc, next, &chan->done_list, node) {
		struct dmaengine_desc_callback cb;

		if (desc->cyclic) {
			xilinx_dma_chan_handle_cyclic(chan, desc, &flags);
			break;
		}

		/* Remove from the list of running transactions */
		list_del(&desc->node);

		/* Run the link descriptor callback function */
		dmaengine_desc_get_callback(&desc->async_tx, &cb);
		if (dmaengine_desc_callback_valid(&cb)) {
			spin_unlock_irqrestore(&chan->lock, flags);
			dmaengine_desc_callback_invoke(&cb, NULL);
			spin_lock_irqsave(&chan->lock, flags);
		}

		/* Run any dependencies, then free the descriptor */
		dma_run_dependencies(&desc->async_tx);
		xilinx_dma_free_tx_descriptor(chan, desc);
	}

	spin_unlock_irqrestore(&chan->lock, flags);
}

/**
 * xilinx_dma_do_tasklet - Schedule completion tasklet
 * @data: Pointer to the Xilinx DMA channel structure
 */
static void xilinx_dma_do_tasklet(unsigned long data)
{
	struct xilinx_dma_chan *chan = (struct xilinx_dma_chan *)data;

	xilinx_dma_chan_desc_cleanup(chan);
}

/**
 * xilinx_dma_alloc_chan_resources - Allocate channel resources
 * @dchan: DMA channel
 *
 * Return: '0' on success and failure value on error
 */
static int xilinx_dma_alloc_chan_resources(struct dma_chan *dchan)
{
	struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);

	/* Has this channel already been allocated? */
	if (chan->desc_pool)
		return 0;

	/*
	 * We need the descriptor to be aligned to 64bytes
	 * for meeting Xilinx VDMA specification requirement.
	 */
	if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
		chan->desc_pool = dma_pool_create("xilinx_dma_desc_pool",
				   chan->dev,
				   sizeof(struct xilinx_axidma_tx_segment),
				   __alignof__(struct xilinx_axidma_tx_segment),
				   0);
	} else if (chan->xdev->dma_config->dmatype == XDMA_TYPE_CDMA) {
		chan->desc_pool = dma_pool_create("xilinx_cdma_desc_pool",
				   chan->dev,
				   sizeof(struct xilinx_cdma_tx_segment),
				   __alignof__(struct xilinx_cdma_tx_segment),
				   0);
	} else {
		chan->desc_pool = dma_pool_create("xilinx_vdma_desc_pool",
				     chan->dev,
				     sizeof(struct xilinx_vdma_tx_segment),
				     __alignof__(struct xilinx_vdma_tx_segment),
				     0);
	}

	if (!chan->desc_pool) {
		dev_err(chan->dev,
			"unable to allocate channel %d descriptor pool\n",
			chan->id);
		return -ENOMEM;
	}

	if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
		/*
		 * For AXI DMA case after submitting a pending_list, keep
		 * an extra segment allocated so that the "next descriptor"
		 * pointer on the tail descriptor always points to a
		 * valid descriptor, even when paused after reaching taildesc.
		 * This way, it is possible to issue additional
		 * transfers without halting and restarting the channel.
		 */
		chan->seg_v = xilinx_axidma_alloc_tx_segment(chan);

		/*
		 * For cyclic DMA mode we need to program the tail Descriptor
		 * register with a value which is not a part of the BD chain
		 * so allocating a desc segment during channel allocation for
		 * programming tail descriptor.
		 */
		chan->cyclic_seg_v = xilinx_axidma_alloc_tx_segment(chan);
	}

	dma_cookie_init(dchan);

	if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
		/* For AXI DMA resetting once channel will reset the
		 * other channel as well so enable the interrupts here.
		 */
		dma_ctrl_set(chan, XILINX_DMA_REG_DMACR,
			      XILINX_DMA_DMAXR_ALL_IRQ_MASK);
	}

	if ((chan->xdev->dma_config->dmatype == XDMA_TYPE_CDMA) && chan->has_sg)
		dma_ctrl_set(chan, XILINX_DMA_REG_DMACR,
			     XILINX_CDMA_CR_SGMODE);

	return 0;
}

/**
 * xilinx_dma_tx_status - Get DMA transaction status
 * @dchan: DMA channel
 * @cookie: Transaction identifier
 * @txstate: Transaction state
 *
 * Return: DMA transaction status
 */
static enum dma_status xilinx_dma_tx_status(struct dma_chan *dchan,
					dma_cookie_t cookie,
					struct dma_tx_state *txstate)
{
	struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
	struct xilinx_dma_tx_descriptor *desc;
	struct xilinx_axidma_tx_segment *segment;
	struct xilinx_axidma_desc_hw *hw;
	enum dma_status ret;
	unsigned long flags;
	u32 residue = 0;

	ret = dma_cookie_status(dchan, cookie, txstate);
	if (ret == DMA_COMPLETE || !txstate)
		return ret;

	if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
		spin_lock_irqsave(&chan->lock, flags);

		desc = list_last_entry(&chan->active_list,
				       struct xilinx_dma_tx_descriptor, node);
		if (chan->has_sg) {
			list_for_each_entry(segment, &desc->segments, node) {
				hw = &segment->hw;
				residue += (hw->control - hw->status) &
					   XILINX_DMA_MAX_TRANS_LEN;
			}
		}
		spin_unlock_irqrestore(&chan->lock, flags);

		chan->residue = residue;
		dma_set_residue(txstate, chan->residue);
	}

	return ret;
}

/**
 * xilinx_dma_is_running - Check if DMA channel is running
 * @chan: Driver specific DMA channel
 *
 * Return: '1' if running, '0' if not.
 */
static bool xilinx_dma_is_running(struct xilinx_dma_chan *chan)
{
	return !(dma_ctrl_read(chan, XILINX_DMA_REG_DMASR) &
		 XILINX_DMA_DMASR_HALTED) &&
		(dma_ctrl_read(chan, XILINX_DMA_REG_DMACR) &
		 XILINX_DMA_DMACR_RUNSTOP);
}

/**
 * xilinx_dma_is_idle - Check if DMA channel is idle
 * @chan: Driver specific DMA channel
 *
 * Return: '1' if idle, '0' if not.
 */
static bool xilinx_dma_is_idle(struct xilinx_dma_chan *chan)
{
	return dma_ctrl_read(chan, XILINX_DMA_REG_DMASR) &
		XILINX_DMA_DMASR_IDLE;
}

/**
 * xilinx_dma_stop_transfer - Halt DMA channel
 * @chan: Driver specific DMA channel
 */
static int xilinx_dma_stop_transfer(struct xilinx_dma_chan *chan)
{
	u32 val;

	dma_ctrl_clr(chan, XILINX_DMA_REG_DMACR, XILINX_DMA_DMACR_RUNSTOP);

	/* Wait for the hardware to halt */
	return xilinx_dma_poll_timeout(chan, XILINX_DMA_REG_DMASR, val,
				       val & XILINX_DMA_DMASR_HALTED, 0,
				       XILINX_DMA_LOOP_COUNT);
}

/**
 * xilinx_cdma_stop_transfer - Wait for the current transfer to complete
 * @chan: Driver specific DMA channel
 */
static int xilinx_cdma_stop_transfer(struct xilinx_dma_chan *chan)
{
	u32 val;

	return xilinx_dma_poll_timeout(chan, XILINX_DMA_REG_DMASR, val,
				       val & XILINX_DMA_DMASR_IDLE, 0,
				       XILINX_DMA_LOOP_COUNT);
}

/**
 * xilinx_dma_start - Start DMA channel
 * @chan: Driver specific DMA channel
 */
static void xilinx_dma_start(struct xilinx_dma_chan *chan)
{
	int err;
	u32 val;

	dma_ctrl_set(chan, XILINX_DMA_REG_DMACR, XILINX_DMA_DMACR_RUNSTOP);

	/* Wait for the hardware to start */
	err = xilinx_dma_poll_timeout(chan, XILINX_DMA_REG_DMASR, val,
				      !(val & XILINX_DMA_DMASR_HALTED), 0,
				      XILINX_DMA_LOOP_COUNT);

	if (err) {
		dev_err(chan->dev, "Cannot start channel %p: %x\n",
			chan, dma_ctrl_read(chan, XILINX_DMA_REG_DMASR));

		chan->err = true;
	}
}

/**
 * xilinx_vdma_start_transfer - Starts VDMA transfer
 * @chan: Driver specific channel struct pointer
 */
static void xilinx_vdma_start_transfer(struct xilinx_dma_chan *chan)
{
	struct xilinx_vdma_config *config = &chan->config;
	struct xilinx_dma_tx_descriptor *desc, *tail_desc;
	u32 reg;
	struct xilinx_vdma_tx_segment *tail_segment;

	/* This function was invoked with lock held */
	if (chan->err)
		return;

	if (list_empty(&chan->pending_list))
		return;

	desc = list_first_entry(&chan->pending_list,
				struct xilinx_dma_tx_descriptor, node);
	tail_desc = list_last_entry(&chan->pending_list,
				    struct xilinx_dma_tx_descriptor, node);

	tail_segment = list_last_entry(&tail_desc->segments,
				       struct xilinx_vdma_tx_segment, node);

	/* If it is SG mode and hardware is busy, cannot submit */
	if (chan->has_sg && xilinx_dma_is_running(chan) &&
	    !xilinx_dma_is_idle(chan)) {
		dev_dbg(chan->dev, "DMA controller still busy\n");
		return;
	}

	/*
	 * If hardware is idle, then all descriptors on the running lists are
	 * done, start new transfers
	 */
	if (chan->has_sg)
		dma_ctrl_write(chan, XILINX_DMA_REG_CURDESC,
				desc->async_tx.phys);

	/* Configure the hardware using info in the config structure */
	reg = dma_ctrl_read(chan, XILINX_DMA_REG_DMACR);

	if (config->frm_cnt_en)
		reg |= XILINX_DMA_DMACR_FRAMECNT_EN;
	else
		reg &= ~XILINX_DMA_DMACR_FRAMECNT_EN;

	/* Configure channel to allow number frame buffers */
	dma_ctrl_write(chan, XILINX_DMA_REG_FRMSTORE,
			chan->desc_pendingcount);

	/*
	 * With SG, start with circular mode, so that BDs can be fetched.
	 * In direct register mode, if not parking, enable circular mode
	 */
	if (chan->has_sg || !config->park)
		reg |= XILINX_DMA_DMACR_CIRC_EN;

	if (config->park)
		reg &= ~XILINX_DMA_DMACR_CIRC_EN;

	dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, reg);

	if (config->park && (config->park_frm >= 0) &&
			(config->park_frm < chan->num_frms)) {
		if (chan->direction == DMA_MEM_TO_DEV)
			dma_write(chan, XILINX_DMA_REG_PARK_PTR,
				config->park_frm <<
					XILINX_DMA_PARK_PTR_RD_REF_SHIFT);
		else
			dma_write(chan, XILINX_DMA_REG_PARK_PTR,
				config->park_frm <<
					XILINX_DMA_PARK_PTR_WR_REF_SHIFT);
	}

	/* Start the hardware */
	xilinx_dma_start(chan);

	if (chan->err)
		return;

	/* Start the transfer */
	if (chan->has_sg) {
		dma_ctrl_write(chan, XILINX_DMA_REG_TAILDESC,
				tail_segment->phys);
	} else {
		struct xilinx_vdma_tx_segment *segment, *last = NULL;
		int i = 0;

		if (chan->desc_submitcount < chan->num_frms)
			i = chan->desc_submitcount;

		list_for_each_entry(segment, &desc->segments, node) {
			if (chan->ext_addr)
				vdma_desc_write_64(chan,
					XILINX_VDMA_REG_START_ADDRESS_64(i++),
					segment->hw.buf_addr,
					segment->hw.buf_addr_msb);
			else
				vdma_desc_write(chan,
					XILINX_VDMA_REG_START_ADDRESS(i++),
					segment->hw.buf_addr);

			last = segment;
		}

		if (!last)
			return;

		/* HW expects these parameters to be same for one transaction */
		vdma_desc_write(chan, XILINX_DMA_REG_HSIZE, last->hw.hsize);
		vdma_desc_write(chan, XILINX_DMA_REG_FRMDLY_STRIDE,
				last->hw.stride);
		vdma_desc_write(chan, XILINX_DMA_REG_VSIZE, last->hw.vsize);
	}

	if (!chan->has_sg) {
		list_del(&desc->node);
		list_add_tail(&desc->node, &chan->active_list);
		chan->desc_submitcount++;
		chan->desc_pendingcount--;
		if (chan->desc_submitcount == chan->num_frms)
			chan->desc_submitcount = 0;
	} else {
		list_splice_tail_init(&chan->pending_list, &chan->active_list);
		chan->desc_pendingcount = 0;
	}
}

/**
 * xilinx_cdma_start_transfer - Starts cdma transfer
 * @chan: Driver specific channel struct pointer
 */
static void xilinx_cdma_start_transfer(struct xilinx_dma_chan *chan)
{
	struct xilinx_dma_tx_descriptor *head_desc, *tail_desc;
	struct xilinx_cdma_tx_segment *tail_segment;
	u32 ctrl_reg = dma_read(chan, XILINX_DMA_REG_DMACR);

	if (chan->err)
		return;

	if (list_empty(&chan->pending_list))
		return;

	head_desc = list_first_entry(&chan->pending_list,
				     struct xilinx_dma_tx_descriptor, node);
	tail_desc = list_last_entry(&chan->pending_list,
				    struct xilinx_dma_tx_descriptor, node);
	tail_segment = list_last_entry(&tail_desc->segments,
				       struct xilinx_cdma_tx_segment, node);

	if (chan->desc_pendingcount <= XILINX_DMA_COALESCE_MAX) {
		ctrl_reg &= ~XILINX_DMA_CR_COALESCE_MAX;
		ctrl_reg |= chan->desc_pendingcount <<
				XILINX_DMA_CR_COALESCE_SHIFT;
		dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, ctrl_reg);
	}

	if (chan->has_sg) {
		xilinx_write(chan, XILINX_DMA_REG_CURDESC,
			     head_desc->async_tx.phys);

		/* Update tail ptr register which will start the transfer */
		xilinx_write(chan, XILINX_DMA_REG_TAILDESC,
			     tail_segment->phys);
	} else {
		/* In simple mode */
		struct xilinx_cdma_tx_segment *segment;
		struct xilinx_cdma_desc_hw *hw;

		segment = list_first_entry(&head_desc->segments,
					   struct xilinx_cdma_tx_segment,
					   node);

		hw = &segment->hw;

		xilinx_write(chan, XILINX_CDMA_REG_SRCADDR, hw->src_addr);
		xilinx_write(chan, XILINX_CDMA_REG_DSTADDR, hw->dest_addr);

		/* Start the transfer */
		dma_ctrl_write(chan, XILINX_DMA_REG_BTT,
				hw->control & XILINX_DMA_MAX_TRANS_LEN);
	}

	list_splice_tail_init(&chan->pending_list, &chan->active_list);
	chan->desc_pendingcount = 0;
}

/**
 * xilinx_dma_start_transfer - Starts DMA transfer
 * @chan: Driver specific channel struct pointer
 */
static void xilinx_dma_start_transfer(struct xilinx_dma_chan *chan)
{
	struct xilinx_dma_tx_descriptor *head_desc, *tail_desc;
	struct xilinx_axidma_tx_segment *tail_segment, *old_head, *new_head;
	u32 reg;

	if (chan->err)
		return;

	if (list_empty(&chan->pending_list))
		return;

	/* If it is SG mode and hardware is busy, cannot submit */
	if (chan->has_sg && xilinx_dma_is_running(chan) &&
	    !xilinx_dma_is_idle(chan)) {
		dev_dbg(chan->dev, "DMA controller still busy\n");
		return;
	}

	head_desc = list_first_entry(&chan->pending_list,
				     struct xilinx_dma_tx_descriptor, node);
	tail_desc = list_last_entry(&chan->pending_list,
				    struct xilinx_dma_tx_descriptor, node);
	tail_segment = list_last_entry(&tail_desc->segments,
				       struct xilinx_axidma_tx_segment, node);

	if (chan->has_sg && !chan->xdev->mcdma) {
		old_head = list_first_entry(&head_desc->segments,
					struct xilinx_axidma_tx_segment, node);
		new_head = chan->seg_v;
		/* Copy Buffer Descriptor fields. */
		new_head->hw = old_head->hw;

		/* Swap and save new reserve */
		list_replace_init(&old_head->node, &new_head->node);
		chan->seg_v = old_head;

		tail_segment->hw.next_desc = chan->seg_v->phys;
		head_desc->async_tx.phys = new_head->phys;
	}

	reg = dma_ctrl_read(chan, XILINX_DMA_REG_DMACR);

	if (chan->desc_pendingcount <= XILINX_DMA_COALESCE_MAX) {
		reg &= ~XILINX_DMA_CR_COALESCE_MAX;
		reg |= chan->desc_pendingcount <<
				  XILINX_DMA_CR_COALESCE_SHIFT;
		dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, reg);
	}

	if (chan->has_sg && !chan->xdev->mcdma)
		xilinx_write(chan, XILINX_DMA_REG_CURDESC,
			     head_desc->async_tx.phys);

	if (chan->has_sg && chan->xdev->mcdma) {
		if (chan->direction == DMA_MEM_TO_DEV) {
			dma_ctrl_write(chan, XILINX_DMA_REG_CURDESC,
				       head_desc->async_tx.phys);
		} else {
			if (!chan->tdest) {
				dma_ctrl_write(chan, XILINX_DMA_REG_CURDESC,
				       head_desc->async_tx.phys);
			} else {
				dma_ctrl_write(chan,
					XILINX_DMA_MCRX_CDESC(chan->tdest),
				       head_desc->async_tx.phys);
			}
		}
	}

	xilinx_dma_start(chan);

	if (chan->err)
		return;

	/* Start the transfer */
	if (chan->has_sg && !chan->xdev->mcdma) {
		if (chan->cyclic)
			xilinx_write(chan, XILINX_DMA_REG_TAILDESC,
				     chan->cyclic_seg_v->phys);
		else
			xilinx_write(chan, XILINX_DMA_REG_TAILDESC,
				     tail_segment->phys);
	} else if (chan->has_sg && chan->xdev->mcdma) {
		if (chan->direction == DMA_MEM_TO_DEV) {
			dma_ctrl_write(chan, XILINX_DMA_REG_TAILDESC,
			       tail_segment->phys);
		} else {
			if (!chan->tdest) {
				dma_ctrl_write(chan, XILINX_DMA_REG_TAILDESC,
					       tail_segment->phys);
			} else {
				dma_ctrl_write(chan,
					XILINX_DMA_MCRX_TDESC(chan->tdest),
					tail_segment->phys);
			}
		}
	} else {
		struct xilinx_axidma_tx_segment *segment;
		struct xilinx_axidma_desc_hw *hw;

		segment = list_first_entry(&head_desc->segments,
					   struct xilinx_axidma_tx_segment,
					   node);
		hw = &segment->hw;

		xilinx_write(chan, XILINX_DMA_REG_SRCDSTADDR, hw->buf_addr);

		/* Start the transfer */
		dma_ctrl_write(chan, XILINX_DMA_REG_BTT,
			       hw->control & XILINX_DMA_MAX_TRANS_LEN);
	}

	list_splice_tail_init(&chan->pending_list, &chan->active_list);
	chan->desc_pendingcount = 0;
}

/**
 * xilinx_dma_issue_pending - Issue pending transactions
 * @dchan: DMA channel
 */
static void xilinx_dma_issue_pending(struct dma_chan *dchan)
{
	struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
	unsigned long flags;

	spin_lock_irqsave(&chan->lock, flags);
	chan->start_transfer(chan);
	spin_unlock_irqrestore(&chan->lock, flags);
}

/**
 * xilinx_dma_complete_descriptor - Mark the active descriptor as complete
 * @chan : xilinx DMA channel
 *
 * CONTEXT: hardirq
 */
static void xilinx_dma_complete_descriptor(struct xilinx_dma_chan *chan)
{
	struct xilinx_dma_tx_descriptor *desc, *next;

	/* This function was invoked with lock held */
	if (list_empty(&chan->active_list))
		return;

	list_for_each_entry_safe(desc, next, &chan->active_list, node) {
		list_del(&desc->node);
		if (!desc->cyclic)
			dma_cookie_complete(&desc->async_tx);
		list_add_tail(&desc->node, &chan->done_list);
	}
}

/**
 * xilinx_dma_reset - Reset DMA channel
 * @chan: Driver specific DMA channel
 *
 * Return: '0' on success and failure value on error
 */
static int xilinx_dma_reset(struct xilinx_dma_chan *chan)
{
	int err;
	u32 tmp;

	dma_ctrl_set(chan, XILINX_DMA_REG_DMACR, XILINX_DMA_DMACR_RESET);

	/* Wait for the hardware to finish reset */
	err = xilinx_dma_poll_timeout(chan, XILINX_DMA_REG_DMACR, tmp,
				      !(tmp & XILINX_DMA_DMACR_RESET), 0,
				      XILINX_DMA_LOOP_COUNT);

	if (err) {
		dev_err(chan->dev, "reset timeout, cr %x, sr %x\n",
			dma_ctrl_read(chan, XILINX_DMA_REG_DMACR),
			dma_ctrl_read(chan, XILINX_DMA_REG_DMASR));
		return -ETIMEDOUT;
	}

	chan->err = false;

	return err;
}

/**
 * xilinx_dma_chan_reset - Reset DMA channel and enable interrupts
 * @chan: Driver specific DMA channel
 *
 * Return: '0' on success and failure value on error
 */
static int xilinx_dma_chan_reset(struct xilinx_dma_chan *chan)
{
	int err;

	/* Reset VDMA */
	err = xilinx_dma_reset(chan);
	if (err)
		return err;

	/* Enable interrupts */
	dma_ctrl_set(chan, XILINX_DMA_REG_DMACR,
		      XILINX_DMA_DMAXR_ALL_IRQ_MASK);

	return 0;
}

/**
 * xilinx_dma_irq_handler - DMA Interrupt handler
 * @irq: IRQ number
 * @data: Pointer to the Xilinx DMA channel structure
 *
 * Return: IRQ_HANDLED/IRQ_NONE
 */
static irqreturn_t xilinx_dma_irq_handler(int irq, void *data)
{
	struct xilinx_dma_chan *chan = data;
	u32 status;

	/* Read the status and ack the interrupts. */
	status = dma_ctrl_read(chan, XILINX_DMA_REG_DMASR);
	if (!(status & XILINX_DMA_DMAXR_ALL_IRQ_MASK))
		return IRQ_NONE;

	dma_ctrl_write(chan, XILINX_DMA_REG_DMASR,
			status & XILINX_DMA_DMAXR_ALL_IRQ_MASK);

	if (status & XILINX_DMA_DMASR_ERR_IRQ) {
		/*
		 * An error occurred. If C_FLUSH_ON_FSYNC is enabled and the
		 * error is recoverable, ignore it. Otherwise flag the error.
		 *
		 * Only recoverable errors can be cleared in the DMASR register,
		 * make sure not to write to other error bits to 1.
		 */
		u32 errors = status & XILINX_DMA_DMASR_ALL_ERR_MASK;

		dma_ctrl_write(chan, XILINX_DMA_REG_DMASR,
				errors & XILINX_DMA_DMASR_ERR_RECOVER_MASK);

		if (!chan->flush_on_fsync ||
		    (errors & ~XILINX_DMA_DMASR_ERR_RECOVER_MASK)) {
			dev_err(chan->dev,
				"Channel %p has errors %x, cdr %x tdr %x\n",
				chan, errors,
				dma_ctrl_read(chan, XILINX_DMA_REG_CURDESC),
				dma_ctrl_read(chan, XILINX_DMA_REG_TAILDESC));
			chan->err = true;
		}
	}

	if (status & XILINX_DMA_DMASR_DLY_CNT_IRQ) {
		/*
		 * Device takes too long to do the transfer when user requires
		 * responsiveness.
		 */
		dev_dbg(chan->dev, "Inter-packet latency too long\n");
	}

	if (status & XILINX_DMA_DMASR_FRM_CNT_IRQ) {
		spin_lock(&chan->lock);
		xilinx_dma_complete_descriptor(chan);
		chan->start_transfer(chan);
		spin_unlock(&chan->lock);
	}

	tasklet_schedule(&chan->tasklet);
	return IRQ_HANDLED;
}

/**
 * append_desc_queue - Queuing descriptor
 * @chan: Driver specific dma channel
 * @desc: dma transaction descriptor
 */
static void append_desc_queue(struct xilinx_dma_chan *chan,
			      struct xilinx_dma_tx_descriptor *desc)
{
	struct xilinx_vdma_tx_segment *tail_segment;
	struct xilinx_dma_tx_descriptor *tail_desc;
	struct xilinx_axidma_tx_segment *axidma_tail_segment;
	struct xilinx_cdma_tx_segment *cdma_tail_segment;

	if (list_empty(&chan->pending_list))
		goto append;

	/*
	 * Add the hardware descriptor to the chain of hardware descriptors
	 * that already exists in memory.
	 */
	tail_desc = list_last_entry(&chan->pending_list,
				    struct xilinx_dma_tx_descriptor, node);
	if (chan->xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
		tail_segment = list_last_entry(&tail_desc->segments,
					       struct xilinx_vdma_tx_segment,
					       node);
		tail_segment->hw.next_desc = (u32)desc->async_tx.phys;
	} else if (chan->xdev->dma_config->dmatype == XDMA_TYPE_CDMA) {
		cdma_tail_segment = list_last_entry(&tail_desc->segments,
						struct xilinx_cdma_tx_segment,
						node);
		cdma_tail_segment->hw.next_desc = (u32)desc->async_tx.phys;
	} else {
		axidma_tail_segment = list_last_entry(&tail_desc->segments,
					       struct xilinx_axidma_tx_segment,
					       node);
		axidma_tail_segment->hw.next_desc = (u32)desc->async_tx.phys;
	}

	/*
	 * Add the software descriptor and all children to the list
	 * of pending transactions
	 */
append:
	list_add_tail(&desc->node, &chan->pending_list);
	chan->desc_pendingcount++;

	if (chan->has_sg && (chan->xdev->dma_config->dmatype == XDMA_TYPE_VDMA)
	    && unlikely(chan->desc_pendingcount > chan->num_frms)) {
		dev_dbg(chan->dev, "desc pendingcount is too high\n");
		chan->desc_pendingcount = chan->num_frms;
	}
}

/**
 * xilinx_dma_tx_submit - Submit DMA transaction
 * @tx: Async transaction descriptor
 *
 * Return: cookie value on success and failure value on error
 */
static dma_cookie_t xilinx_dma_tx_submit(struct dma_async_tx_descriptor *tx)
{
	struct xilinx_dma_tx_descriptor *desc = to_dma_tx_descriptor(tx);
	struct xilinx_dma_chan *chan = to_xilinx_chan(tx->chan);
	dma_cookie_t cookie;
	unsigned long flags;
	int err;

	if (chan->cyclic) {
		xilinx_dma_free_tx_descriptor(chan, desc);
		return -EBUSY;
	}

	if (chan->err) {
		/*
		 * If reset fails, need to hard reset the system.
		 * Channel is no longer functional
		 */
		err = xilinx_dma_chan_reset(chan);
		if (err < 0)
			return err;
	}

	spin_lock_irqsave(&chan->lock, flags);

	cookie = dma_cookie_assign(tx);

	/* Put this transaction onto the tail of the pending queue */
	append_desc_queue(chan, desc);

	if (desc->cyclic)
		chan->cyclic = true;

	spin_unlock_irqrestore(&chan->lock, flags);

	return cookie;
}

/**
 * xilinx_vdma_dma_prep_interleaved - prepare a descriptor for a
 *	DMA_SLAVE transaction
 * @dchan: DMA channel
 * @xt: Interleaved template pointer
 * @flags: transfer ack flags
 *
 * Return: Async transaction descriptor on success and NULL on failure
 */
static struct dma_async_tx_descriptor *
xilinx_vdma_dma_prep_interleaved(struct dma_chan *dchan,
				 struct dma_interleaved_template *xt,
				 unsigned long flags)
{
	struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
	struct xilinx_dma_tx_descriptor *desc;
	struct xilinx_vdma_tx_segment *segment, *prev = NULL;
	struct xilinx_vdma_desc_hw *hw;

	if (!is_slave_direction(xt->dir))
		return NULL;

	if (!xt->numf || !xt->sgl[0].size)
		return NULL;

	if (xt->frame_size != 1)
		return NULL;

	/* Allocate a transaction descriptor. */
	desc = xilinx_dma_alloc_tx_descriptor(chan);
	if (!desc)
		return NULL;

	dma_async_tx_descriptor_init(&desc->async_tx, &chan->common);
	desc->async_tx.tx_submit = xilinx_dma_tx_submit;
	async_tx_ack(&desc->async_tx);

	/* Allocate the link descriptor from DMA pool */
	segment = xilinx_vdma_alloc_tx_segment(chan);
	if (!segment)
		goto error;

	/* Fill in the hardware descriptor */
	hw = &segment->hw;
	hw->vsize = xt->numf;
	hw->hsize = xt->sgl[0].size;
	hw->stride = (xt->sgl[0].icg + xt->sgl[0].size) <<
			XILINX_DMA_FRMDLY_STRIDE_STRIDE_SHIFT;
	hw->stride |= chan->config.frm_dly <<
			XILINX_DMA_FRMDLY_STRIDE_FRMDLY_SHIFT;

	if (xt->dir != DMA_MEM_TO_DEV) {
		if (chan->ext_addr) {
			hw->buf_addr = lower_32_bits(xt->dst_start);
			hw->buf_addr_msb = upper_32_bits(xt->dst_start);
		} else {
			hw->buf_addr = xt->dst_start;
		}
	} else {
		if (chan->ext_addr) {
			hw->buf_addr = lower_32_bits(xt->src_start);
			hw->buf_addr_msb = upper_32_bits(xt->src_start);
		} else {
			hw->buf_addr = xt->src_start;
		}
	}

	/* Insert the segment into the descriptor segments list. */
	list_add_tail(&segment->node, &desc->segments);

	prev = segment;

	/* Link the last hardware descriptor with the first. */
	segment = list_first_entry(&desc->segments,
				   struct xilinx_vdma_tx_segment, node);
	desc->async_tx.phys = segment->phys;

	return &desc->async_tx;

error:
	xilinx_dma_free_tx_descriptor(chan, desc);
	return NULL;
}

/**
 * xilinx_cdma_prep_memcpy - prepare descriptors for a memcpy transaction
 * @dchan: DMA channel
 * @dma_dst: destination address
 * @dma_src: source address
 * @len: transfer length
 * @flags: transfer ack flags
 *
 * Return: Async transaction descriptor on success and NULL on failure
 */
static struct dma_async_tx_descriptor *
xilinx_cdma_prep_memcpy(struct dma_chan *dchan, dma_addr_t dma_dst,
			dma_addr_t dma_src, size_t len, unsigned long flags)
{
	struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
	struct xilinx_dma_tx_descriptor *desc;
	struct xilinx_cdma_tx_segment *segment;
	struct xilinx_cdma_desc_hw *hw;

	if (!len || len > XILINX_DMA_MAX_TRANS_LEN)
		return NULL;

	desc = xilinx_dma_alloc_tx_descriptor(chan);
	if (!desc)
		return NULL;

	dma_async_tx_descriptor_init(&desc->async_tx, &chan->common);
	desc->async_tx.tx_submit = xilinx_dma_tx_submit;

	/* Allocate the link descriptor from DMA pool */
	segment = xilinx_cdma_alloc_tx_segment(chan);
	if (!segment)
		goto error;

	hw = &segment->hw;
	hw->control = len;
	hw->src_addr = dma_src;
	hw->dest_addr = dma_dst;
	if (chan->ext_addr) {
		hw->src_addr_msb = upper_32_bits(dma_src);
		hw->dest_addr_msb = upper_32_bits(dma_dst);
	}

	/* Insert the segment into the descriptor segments list. */
	list_add_tail(&segment->node, &desc->segments);

	desc->async_tx.phys = segment->phys;
	hw->next_desc = segment->phys;

	return &desc->async_tx;

error:
	xilinx_dma_free_tx_descriptor(chan, desc);
	return NULL;
}

/**
 * xilinx_dma_prep_slave_sg - prepare descriptors for a DMA_SLAVE transaction
 * @dchan: DMA channel
 * @sgl: scatterlist to transfer to/from
 * @sg_len: number of entries in @scatterlist
 * @direction: DMA direction
 * @flags: transfer ack flags
 * @context: APP words of the descriptor
 *
 * Return: Async transaction descriptor on success and NULL on failure
 */
static struct dma_async_tx_descriptor *xilinx_dma_prep_slave_sg(
	struct dma_chan *dchan, struct scatterlist *sgl, unsigned int sg_len,
	enum dma_transfer_direction direction, unsigned long flags,
	void *context)
{
	struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
	struct xilinx_dma_tx_descriptor *desc;
	struct xilinx_axidma_tx_segment *segment = NULL, *prev = NULL;
	u32 *app_w = (u32 *)context;
	struct scatterlist *sg;
	size_t copy;
	size_t sg_used;
	unsigned int i;

	if (!is_slave_direction(direction))
		return NULL;

	/* Allocate a transaction descriptor. */
	desc = xilinx_dma_alloc_tx_descriptor(chan);
	if (!desc)
		return NULL;

	dma_async_tx_descriptor_init(&desc->async_tx, &chan->common);
	desc->async_tx.tx_submit = xilinx_dma_tx_submit;

	/* Build transactions using information in the scatter gather list */
	for_each_sg(sgl, sg, sg_len, i) {
		sg_used = 0;

		/* Loop until the entire scatterlist entry is used */
		while (sg_used < sg_dma_len(sg)) {
			struct xilinx_axidma_desc_hw *hw;

			/* Get a free segment */
			segment = xilinx_axidma_alloc_tx_segment(chan);
			if (!segment)
				goto error;

			/*
			 * Calculate the maximum number of bytes to transfer,
			 * making sure it is less than the hw limit
			 */
			copy = min_t(size_t, sg_dma_len(sg) - sg_used,
				     XILINX_DMA_MAX_TRANS_LEN);
			hw = &segment->hw;

			/* Fill in the descriptor */
			xilinx_axidma_buf(chan, hw, sg_dma_address(sg),
					  sg_used, 0);

			hw->control = copy;

			if (chan->direction == DMA_MEM_TO_DEV) {
				if (app_w)
					memcpy(hw->app, app_w, sizeof(u32) *
					       XILINX_DMA_NUM_APP_WORDS);
			}

			if (prev)
				prev->hw.next_desc = segment->phys;

			prev = segment;
			sg_used += copy;

			/*
			 * Insert the segment into the descriptor segments
			 * list.
			 */
			list_add_tail(&segment->node, &desc->segments);
		}
	}

	segment = list_first_entry(&desc->segments,
				   struct xilinx_axidma_tx_segment, node);
	desc->async_tx.phys = segment->phys;
	prev->hw.next_desc = segment->phys;

	/* For the last DMA_MEM_TO_DEV transfer, set EOP */
	if (chan->direction == DMA_MEM_TO_DEV) {
		segment->hw.control |= XILINX_DMA_BD_SOP;
		segment = list_last_entry(&desc->segments,
					  struct xilinx_axidma_tx_segment,
					  node);
		segment->hw.control |= XILINX_DMA_BD_EOP;
	}

	return &desc->async_tx;

error:
	xilinx_dma_free_tx_descriptor(chan, desc);
	return NULL;
}

/**
 * xilinx_dma_prep_dma_cyclic - prepare descriptors for a DMA_SLAVE transaction
 * @chan: DMA channel
 * @sgl: scatterlist to transfer to/from
 * @sg_len: number of entries in @scatterlist
 * @direction: DMA direction
 * @flags: transfer ack flags
 */
static struct dma_async_tx_descriptor *xilinx_dma_prep_dma_cyclic(
	struct dma_chan *dchan, dma_addr_t buf_addr, size_t buf_len,
	size_t period_len, enum dma_transfer_direction direction,
	unsigned long flags)
{
	struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
	struct xilinx_dma_tx_descriptor *desc;
	struct xilinx_axidma_tx_segment *segment, *head_segment, *prev = NULL;
	size_t copy, sg_used;
	unsigned int num_periods;
	int i;
	u32 reg;

	if (!period_len)
		return NULL;

	num_periods = buf_len / period_len;

	if (!num_periods)
		return NULL;

	if (!is_slave_direction(direction))
		return NULL;

	/* Allocate a transaction descriptor. */
	desc = xilinx_dma_alloc_tx_descriptor(chan);
	if (!desc)
		return NULL;

	chan->direction = direction;
	dma_async_tx_descriptor_init(&desc->async_tx, &chan->common);
	desc->async_tx.tx_submit = xilinx_dma_tx_submit;

	for (i = 0; i < num_periods; ++i) {
		sg_used = 0;

		while (sg_used < period_len) {
			struct xilinx_axidma_desc_hw *hw;

			/* Get a free segment */
			segment = xilinx_axidma_alloc_tx_segment(chan);
			if (!segment)
				goto error;

			/*
			 * Calculate the maximum number of bytes to transfer,
			 * making sure it is less than the hw limit
			 */
			copy = min_t(size_t, period_len - sg_used,
				     XILINX_DMA_MAX_TRANS_LEN);
			hw = &segment->hw;
			xilinx_axidma_buf(chan, hw, buf_addr, sg_used,
					  period_len * i);
			hw->control = copy;

			if (prev)
				prev->hw.next_desc = segment->phys;

			prev = segment;
			sg_used += copy;

			/*
			 * Insert the segment into the descriptor segments
			 * list.
			 */
			list_add_tail(&segment->node, &desc->segments);
		}
	}

	head_segment = list_first_entry(&desc->segments,
				   struct xilinx_axidma_tx_segment, node);
	desc->async_tx.phys = head_segment->phys;

	desc->cyclic = true;
	reg = dma_ctrl_read(chan, XILINX_DMA_REG_DMACR);
	reg |= XILINX_DMA_CR_CYCLIC_BD_EN_MASK;
	dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, reg);

	segment = list_last_entry(&desc->segments,
				  struct xilinx_axidma_tx_segment,
				  node);
	segment->hw.next_desc = (u32) head_segment->phys;

	/* For the last DMA_MEM_TO_DEV transfer, set EOP */
	if (direction == DMA_MEM_TO_DEV) {
		head_segment->hw.control |= XILINX_DMA_BD_SOP;
		segment->hw.control |= XILINX_DMA_BD_EOP;
	}

	return &desc->async_tx;

error:
	xilinx_dma_free_tx_descriptor(chan, desc);
	return NULL;
}

/**
 * xilinx_dma_prep_interleaved - prepare a descriptor for a
 *	DMA_SLAVE transaction
 * @dchan: DMA channel
 * @xt: Interleaved template pointer
 * @flags: transfer ack flags
 *
 * Return: Async transaction descriptor on success and NULL on failure
 */
static struct dma_async_tx_descriptor *
xilinx_dma_prep_interleaved(struct dma_chan *dchan,
				 struct dma_interleaved_template *xt,
				 unsigned long flags)
{
	struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
	struct xilinx_dma_tx_descriptor *desc;
	struct xilinx_axidma_tx_segment *segment;
	struct xilinx_axidma_desc_hw *hw;

	if (!is_slave_direction(xt->dir))
		return NULL;

	if (!xt->numf || !xt->sgl[0].size)
		return NULL;

	if (xt->frame_size != 1)
		return NULL;

	/* Allocate a transaction descriptor. */
	desc = xilinx_dma_alloc_tx_descriptor(chan);
	if (!desc)
		return NULL;

	chan->direction = xt->dir;
	dma_async_tx_descriptor_init(&desc->async_tx, &chan->common);
	desc->async_tx.tx_submit = xilinx_dma_tx_submit;

	/* Get a free segment */
	segment = xilinx_axidma_alloc_tx_segment(chan);
	if (!segment)
		goto error;

	hw = &segment->hw;

	/* Fill in the descriptor */
	if (xt->dir != DMA_MEM_TO_DEV)
		hw->buf_addr = xt->dst_start;
	else
		hw->buf_addr = xt->src_start;

	hw->mcdma_control = chan->tdest & XILINX_DMA_BD_TDEST_MASK;
	hw->vsize_stride = (xt->numf << XILINX_DMA_BD_VSIZE_SHIFT) &
			    XILINX_DMA_BD_VSIZE_MASK;
	hw->vsize_stride |= (xt->sgl[0].icg + xt->sgl[0].size) &
			    XILINX_DMA_BD_STRIDE_MASK;
	hw->control = xt->sgl[0].size & XILINX_DMA_BD_HSIZE_MASK;

	/*
	 * Insert the segment into the descriptor segments
	 * list.
	 */
	list_add_tail(&segment->node, &desc->segments);


	segment = list_first_entry(&desc->segments,
				   struct xilinx_axidma_tx_segment, node);
	desc->async_tx.phys = segment->phys;

	/* For the last DMA_MEM_TO_DEV transfer, set EOP */
	if (xt->dir == DMA_MEM_TO_DEV) {
		segment->hw.control |= XILINX_DMA_BD_SOP;
		segment = list_last_entry(&desc->segments,
					  struct xilinx_axidma_tx_segment,
					  node);
		segment->hw.control |= XILINX_DMA_BD_EOP;
	}

	return &desc->async_tx;

error:
	xilinx_dma_free_tx_descriptor(chan, desc);
	return NULL;
}

/**
 * xilinx_dma_terminate_all - Halt the channel and free descriptors
 * @chan: Driver specific DMA Channel pointer
 */
static int xilinx_dma_terminate_all(struct dma_chan *dchan)
{
	struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
	u32 reg;
	int err;

	if (chan->cyclic)
		xilinx_dma_chan_reset(chan);

	err = chan->stop_transfer(chan);
	if (err) {
		dev_err(chan->dev, "Cannot stop channel %p: %x\n",
			chan, dma_ctrl_read(chan, XILINX_DMA_REG_DMASR));
		chan->err = true;
	}

	/* Remove and free all of the descriptors in the lists */
	xilinx_dma_free_descriptors(chan);

	if (chan->cyclic) {
		reg = dma_ctrl_read(chan, XILINX_DMA_REG_DMACR);
		reg &= ~XILINX_DMA_CR_CYCLIC_BD_EN_MASK;
		dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, reg);
		chan->cyclic = false;
	}

	return 0;
}

/**
 * xilinx_dma_channel_set_config - Configure VDMA channel
 * Run-time configuration for Axi VDMA, supports:
 * . halt the channel
 * . configure interrupt coalescing and inter-packet delay threshold
 * . start/stop parking
 * . enable genlock
 *
 * @dchan: DMA channel
 * @cfg: VDMA device configuration pointer
 *
 * Return: '0' on success and failure value on error
 */
int xilinx_vdma_channel_set_config(struct dma_chan *dchan,
					struct xilinx_vdma_config *cfg)
{
	struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
	u32 dmacr;

	if (cfg->reset)
		return xilinx_dma_chan_reset(chan);

	dmacr = dma_ctrl_read(chan, XILINX_DMA_REG_DMACR);

	chan->config.frm_dly = cfg->frm_dly;
	chan->config.park = cfg->park;

	/* genlock settings */
	chan->config.gen_lock = cfg->gen_lock;
	chan->config.master = cfg->master;

	if (cfg->gen_lock && chan->genlock) {
		dmacr |= XILINX_DMA_DMACR_GENLOCK_EN;
		dmacr |= cfg->master << XILINX_DMA_DMACR_MASTER_SHIFT;
	}

	chan->config.frm_cnt_en = cfg->frm_cnt_en;
	if (cfg->park)
		chan->config.park_frm = cfg->park_frm;
	else
		chan->config.park_frm = -1;

	chan->config.coalesc = cfg->coalesc;
	chan->config.delay = cfg->delay;

	if (cfg->coalesc <= XILINX_DMA_DMACR_FRAME_COUNT_MAX) {
		dmacr |= cfg->coalesc << XILINX_DMA_DMACR_FRAME_COUNT_SHIFT;
		chan->config.coalesc = cfg->coalesc;
	}

	if (cfg->delay <= XILINX_DMA_DMACR_DELAY_MAX) {
		dmacr |= cfg->delay << XILINX_DMA_DMACR_DELAY_SHIFT;
		chan->config.delay = cfg->delay;
	}

	/* FSync Source selection */
	dmacr &= ~XILINX_DMA_DMACR_FSYNCSRC_MASK;
	dmacr |= cfg->ext_fsync << XILINX_DMA_DMACR_FSYNCSRC_SHIFT;

	dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, dmacr);

	return 0;
}
EXPORT_SYMBOL(xilinx_vdma_channel_set_config);

/* -----------------------------------------------------------------------------
 * Probe and remove
 */

/**
 * xilinx_dma_chan_remove - Per Channel remove function
 * @chan: Driver specific DMA channel
 */
static void xilinx_dma_chan_remove(struct xilinx_dma_chan *chan)
{
	/* Disable all interrupts */
	dma_ctrl_clr(chan, XILINX_DMA_REG_DMACR,
		      XILINX_DMA_DMAXR_ALL_IRQ_MASK);

	if (chan->irq > 0)
		free_irq(chan->irq, chan);

	tasklet_kill(&chan->tasklet);

	list_del(&chan->common.device_node);
}

static int axidma_clk_init(struct platform_device *pdev, struct clk **axi_clk,
			    struct clk **tx_clk, struct clk **rx_clk,
			    struct clk **sg_clk, struct clk **tmp_clk)
{
	int err;

	*tmp_clk = NULL;

	*axi_clk = devm_clk_get(&pdev->dev, "s_axi_lite_aclk");
	if (IS_ERR(*axi_clk)) {
		err = PTR_ERR(*axi_clk);
		dev_err(&pdev->dev, "failed to get axi_aclk (%d)\n", err);
		return err;
	}

	*tx_clk = devm_clk_get(&pdev->dev, "m_axi_mm2s_aclk");
	if (IS_ERR(*tx_clk))
		*tx_clk = NULL;

	*rx_clk = devm_clk_get(&pdev->dev, "m_axi_s2mm_aclk");
	if (IS_ERR(*rx_clk))
		*rx_clk = NULL;

	*sg_clk = devm_clk_get(&pdev->dev, "m_axi_sg_aclk");
	if (IS_ERR(*sg_clk))
		*sg_clk = NULL;

	err = clk_prepare_enable(*axi_clk);
	if (err) {
		dev_err(&pdev->dev, "failed to enable axi_clk (%d)\n", err);
		return err;
	}

	err = clk_prepare_enable(*tx_clk);
	if (err) {
		dev_err(&pdev->dev, "failed to enable tx_clk (%d)\n", err);
		goto err_disable_axiclk;
	}

	err = clk_prepare_enable(*rx_clk);
	if (err) {
		dev_err(&pdev->dev, "failed to enable rx_clk (%d)\n", err);
		goto err_disable_txclk;
	}

	err = clk_prepare_enable(*sg_clk);
	if (err) {
		dev_err(&pdev->dev, "failed to enable sg_clk (%d)\n", err);
		goto err_disable_rxclk;
	}

	return 0;

err_disable_rxclk:
	clk_disable_unprepare(*rx_clk);
err_disable_txclk:
	clk_disable_unprepare(*tx_clk);
err_disable_axiclk:
	clk_disable_unprepare(*axi_clk);

	return err;
}

static int axicdma_clk_init(struct platform_device *pdev, struct clk **axi_clk,
			    struct clk **dev_clk, struct clk **tmp_clk,
			    struct clk **tmp1_clk, struct clk **tmp2_clk)
{
	int err;

	*tmp_clk = NULL;
	*tmp1_clk = NULL;
	*tmp2_clk = NULL;

	*axi_clk = devm_clk_get(&pdev->dev, "s_axi_lite_aclk");
	if (IS_ERR(*axi_clk)) {
		err = PTR_ERR(*axi_clk);
		dev_err(&pdev->dev, "failed to get axi_clk (%d)\n", err);
		return err;
	}

	*dev_clk = devm_clk_get(&pdev->dev, "m_axi_aclk");
	if (IS_ERR(*dev_clk)) {
		err = PTR_ERR(*dev_clk);
		dev_err(&pdev->dev, "failed to get dev_clk (%d)\n", err);
		return err;
	}

	err = clk_prepare_enable(*axi_clk);
	if (err) {
		dev_err(&pdev->dev, "failed to enable axi_clk (%d)\n", err);
		return err;
	}

	err = clk_prepare_enable(*dev_clk);
	if (err) {
		dev_err(&pdev->dev, "failed to enable dev_clk (%d)\n", err);
		goto err_disable_axiclk;
	}

	return 0;

err_disable_axiclk:
	clk_disable_unprepare(*axi_clk);

	return err;
}

static int axivdma_clk_init(struct platform_device *pdev, struct clk **axi_clk,
			    struct clk **tx_clk, struct clk **txs_clk,
			    struct clk **rx_clk, struct clk **rxs_clk)
{
	int err;

	*axi_clk = devm_clk_get(&pdev->dev, "s_axi_lite_aclk");
	if (IS_ERR(*axi_clk)) {
		err = PTR_ERR(*axi_clk);
		dev_err(&pdev->dev, "failed to get axi_aclk (%d)\n", err);
		return err;
	}

	*tx_clk = devm_clk_get(&pdev->dev, "m_axi_mm2s_aclk");
	if (IS_ERR(*tx_clk))
		*tx_clk = NULL;

	*txs_clk = devm_clk_get(&pdev->dev, "m_axis_mm2s_aclk");
	if (IS_ERR(*txs_clk))
		*txs_clk = NULL;

	*rx_clk = devm_clk_get(&pdev->dev, "m_axi_s2mm_aclk");
	if (IS_ERR(*rx_clk))
		*rx_clk = NULL;

	*rxs_clk = devm_clk_get(&pdev->dev, "s_axis_s2mm_aclk");
	if (IS_ERR(*rxs_clk))
		*rxs_clk = NULL;

	err = clk_prepare_enable(*axi_clk);
	if (err) {
		dev_err(&pdev->dev, "failed to enable axi_clk (%d)\n", err);
		return err;
	}

	err = clk_prepare_enable(*tx_clk);
	if (err) {
		dev_err(&pdev->dev, "failed to enable tx_clk (%d)\n", err);
		goto err_disable_axiclk;
	}

	err = clk_prepare_enable(*txs_clk);
	if (err) {
		dev_err(&pdev->dev, "failed to enable txs_clk (%d)\n", err);
		goto err_disable_txclk;
	}

	err = clk_prepare_enable(*rx_clk);
	if (err) {
		dev_err(&pdev->dev, "failed to enable rx_clk (%d)\n", err);
		goto err_disable_txsclk;
	}

	err = clk_prepare_enable(*rxs_clk);
	if (err) {
		dev_err(&pdev->dev, "failed to enable rxs_clk (%d)\n", err);
		goto err_disable_rxclk;
	}

	return 0;

err_disable_rxclk:
	clk_disable_unprepare(*rx_clk);
err_disable_txsclk:
	clk_disable_unprepare(*txs_clk);
err_disable_txclk:
	clk_disable_unprepare(*tx_clk);
err_disable_axiclk:
	clk_disable_unprepare(*axi_clk);

	return err;
}

static void xdma_disable_allclks(struct xilinx_dma_device *xdev)
{
	clk_disable_unprepare(xdev->rxs_clk);
	clk_disable_unprepare(xdev->rx_clk);
	clk_disable_unprepare(xdev->txs_clk);
	clk_disable_unprepare(xdev->tx_clk);
	clk_disable_unprepare(xdev->axi_clk);
}

/**
 * xilinx_dma_chan_probe - Per Channel Probing
 * It get channel features from the device tree entry and
 * initialize special channel handling routines
 *
 * @xdev: Driver specific device structure
 * @node: Device node
 *
 * Return: '0' on success and failure value on error
 */
static int xilinx_dma_chan_probe(struct xilinx_dma_device *xdev,
				  struct device_node *node, int chan_id)
{
	struct xilinx_dma_chan *chan;
	bool has_dre = false;
	u32 value, width;
	int err;

	/* Allocate and initialize the channel structure */
	chan = devm_kzalloc(xdev->dev, sizeof(*chan), GFP_KERNEL);
	if (!chan)
		return -ENOMEM;

	chan->dev = xdev->dev;
	chan->xdev = xdev;
	chan->has_sg = xdev->has_sg;
	chan->desc_pendingcount = 0x0;
	chan->ext_addr = xdev->ext_addr;

	spin_lock_init(&chan->lock);
	INIT_LIST_HEAD(&chan->pending_list);
	INIT_LIST_HEAD(&chan->done_list);
	INIT_LIST_HEAD(&chan->active_list);

	/* Retrieve the channel properties from the device tree */
	has_dre = of_property_read_bool(node, "xlnx,include-dre");

	chan->genlock = of_property_read_bool(node, "xlnx,genlock-mode");

	err = of_property_read_u32(node, "xlnx,datawidth", &value);
	if (err) {
		dev_err(xdev->dev, "missing xlnx,datawidth property\n");
		return err;
	}
	width = value >> 3; /* Convert bits to bytes */

	/* If data width is greater than 8 bytes, DRE is not in hw */
	if (width > 8)
		has_dre = false;

	if (!has_dre)
		xdev->common.copy_align = fls(width - 1);

	if (of_device_is_compatible(node, "xlnx,axi-vdma-mm2s-channel") ||
	    of_device_is_compatible(node, "xlnx,axi-dma-mm2s-channel") ||
	    of_device_is_compatible(node, "xlnx,axi-cdma-channel")) {
		chan->direction = DMA_MEM_TO_DEV;
		chan->id = chan_id;
		chan->tdest = chan_id;

		chan->ctrl_offset = XILINX_DMA_MM2S_CTRL_OFFSET;
		if (xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
			chan->desc_offset = XILINX_VDMA_MM2S_DESC_OFFSET;

			if (xdev->flush_on_fsync == XILINX_DMA_FLUSH_BOTH ||
			    xdev->flush_on_fsync == XILINX_DMA_FLUSH_MM2S)
				chan->flush_on_fsync = true;
		}
	} else if (of_device_is_compatible(node,
					   "xlnx,axi-vdma-s2mm-channel") ||
		   of_device_is_compatible(node,
					   "xlnx,axi-dma-s2mm-channel")) {
		chan->direction = DMA_DEV_TO_MEM;
		chan->id = chan_id;
		chan->tdest = chan_id - xdev->nr_channels;

		chan->ctrl_offset = XILINX_DMA_S2MM_CTRL_OFFSET;
		if (xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
			chan->desc_offset = XILINX_VDMA_S2MM_DESC_OFFSET;

			if (xdev->flush_on_fsync == XILINX_DMA_FLUSH_BOTH ||
			    xdev->flush_on_fsync == XILINX_DMA_FLUSH_S2MM)
				chan->flush_on_fsync = true;
		}
	} else {
		dev_err(xdev->dev, "Invalid channel compatible node\n");
		return -EINVAL;
	}

	/* Request the interrupt */
	chan->irq = irq_of_parse_and_map(node, 0);
	err = request_irq(chan->irq, xilinx_dma_irq_handler, IRQF_SHARED,
			  "xilinx-dma-controller", chan);
	if (err) {
		dev_err(xdev->dev, "unable to request IRQ %d\n", chan->irq);
		return err;
	}

	if (xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
		chan->start_transfer = xilinx_dma_start_transfer;
		chan->stop_transfer = xilinx_dma_stop_transfer;
	} else if (xdev->dma_config->dmatype == XDMA_TYPE_CDMA) {
		chan->start_transfer = xilinx_cdma_start_transfer;
		chan->stop_transfer = xilinx_cdma_stop_transfer;
	} else {
		chan->start_transfer = xilinx_vdma_start_transfer;
		chan->stop_transfer = xilinx_dma_stop_transfer;
	}

	/* Initialize the tasklet */
	tasklet_init(&chan->tasklet, xilinx_dma_do_tasklet,
			(unsigned long)chan);

	/*
	 * Initialize the DMA channel and add it to the DMA engine channels
	 * list.
	 */
	chan->common.device = &xdev->common;

	list_add_tail(&chan->common.device_node, &xdev->common.channels);
	xdev->chan[chan->id] = chan;

	/* Reset the channel */
	err = xilinx_dma_chan_reset(chan);
	if (err < 0) {
		dev_err(xdev->dev, "Reset channel failed\n");
		return err;
	}

	return 0;
}

/**
 * xilinx_dma_child_probe - Per child node probe
 * It get number of dma-channels per child node from
 * device-tree and initializes all the channels.
 *
 * @xdev: Driver specific device structure
 * @node: Device node
 *
 * Return: 0 always.
 */
static int xilinx_dma_child_probe(struct xilinx_dma_device *xdev,
				    struct device_node *node) {
	int ret, i, nr_channels = 1;

	ret = of_property_read_u32(node, "dma-channels", &nr_channels);
	if ((ret < 0) && xdev->mcdma)
		dev_warn(xdev->dev, "missing dma-channels property\n");

	for (i = 0; i < nr_channels; i++)
		xilinx_dma_chan_probe(xdev, node, xdev->chan_id++);

	xdev->nr_channels += nr_channels;

	return 0;
}

/**
 * of_dma_xilinx_xlate - Translation function
 * @dma_spec: Pointer to DMA specifier as found in the device tree
 * @ofdma: Pointer to DMA controller data
 *
 * Return: DMA channel pointer on success and NULL on error
 */
static struct dma_chan *of_dma_xilinx_xlate(struct of_phandle_args *dma_spec,
						struct of_dma *ofdma)
{
	struct xilinx_dma_device *xdev = ofdma->of_dma_data;
	int chan_id = dma_spec->args[0];

	if (chan_id >= xdev->nr_channels || !xdev->chan[chan_id])
		return NULL;

	return dma_get_slave_channel(&xdev->chan[chan_id]->common);
}

static const struct xilinx_dma_config axidma_config = {
	.dmatype = XDMA_TYPE_AXIDMA,
	.clk_init = axidma_clk_init,
};

static const struct xilinx_dma_config axicdma_config = {
	.dmatype = XDMA_TYPE_CDMA,
	.clk_init = axicdma_clk_init,
};

static const struct xilinx_dma_config axivdma_config = {
	.dmatype = XDMA_TYPE_VDMA,
	.clk_init = axivdma_clk_init,
};

static const struct of_device_id xilinx_dma_of_ids[] = {
	{ .compatible = "xlnx,axi-dma-1.00.a", .data = &axidma_config },
	{ .compatible = "xlnx,axi-cdma-1.00.a", .data = &axicdma_config },
	{ .compatible = "xlnx,axi-vdma-1.00.a", .data = &axivdma_config },
	{}
};
MODULE_DEVICE_TABLE(of, xilinx_dma_of_ids);

/**
 * xilinx_dma_probe - Driver probe function
 * @pdev: Pointer to the platform_device structure
 *
 * Return: '0' on success and failure value on error
 */
static int xilinx_dma_probe(struct platform_device *pdev)
{
	int (*clk_init)(struct platform_device *, struct clk **, struct clk **,
			struct clk **, struct clk **, struct clk **)
					= axivdma_clk_init;
	struct device_node *node = pdev->dev.of_node;
	struct xilinx_dma_device *xdev;
	struct device_node *child, *np = pdev->dev.of_node;
	struct resource *io;
	u32 num_frames, addr_width;
	int i, err;

	/* Allocate and initialize the DMA engine structure */
	xdev = devm_kzalloc(&pdev->dev, sizeof(*xdev), GFP_KERNEL);
	if (!xdev)
		return -ENOMEM;

	xdev->dev = &pdev->dev;
	if (np) {
		const struct of_device_id *match;

		match = of_match_node(xilinx_dma_of_ids, np);
		if (match && match->data) {
			xdev->dma_config = match->data;
			clk_init = xdev->dma_config->clk_init;
		}
	}

	err = clk_init(pdev, &xdev->axi_clk, &xdev->tx_clk, &xdev->txs_clk,
		       &xdev->rx_clk, &xdev->rxs_clk);
	if (err)
		return err;

	/* Request and map I/O memory */
	io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	xdev->regs = devm_ioremap_resource(&pdev->dev, io);
	if (IS_ERR(xdev->regs))
		return PTR_ERR(xdev->regs);

	/* Retrieve the DMA engine properties from the device tree */
	xdev->has_sg = of_property_read_bool(node, "xlnx,include-sg");
	if (xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA)
		xdev->mcdma = of_property_read_bool(node, "xlnx,mcdma");

	if (xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
		err = of_property_read_u32(node, "xlnx,num-fstores",
					   &num_frames);
		if (err < 0) {
			dev_err(xdev->dev,
				"missing xlnx,num-fstores property\n");
			return err;
		}

		err = of_property_read_u32(node, "xlnx,flush-fsync",
					   &xdev->flush_on_fsync);
		if (err < 0)
			dev_warn(xdev->dev,
				 "missing xlnx,flush-fsync property\n");
	}

	err = of_property_read_u32(node, "xlnx,addrwidth", &addr_width);
	if (err < 0)
		dev_warn(xdev->dev, "missing xlnx,addrwidth property\n");

	if (addr_width > 32)
		xdev->ext_addr = true;
	else
		xdev->ext_addr = false;

	/* Set the dma mask bits */
	dma_set_mask(xdev->dev, DMA_BIT_MASK(addr_width));

	/* Initialize the DMA engine */
	xdev->common.dev = &pdev->dev;

	INIT_LIST_HEAD(&xdev->common.channels);
	if (!(xdev->dma_config->dmatype == XDMA_TYPE_CDMA)) {
		dma_cap_set(DMA_SLAVE, xdev->common.cap_mask);
		dma_cap_set(DMA_PRIVATE, xdev->common.cap_mask);
	}

	xdev->common.device_alloc_chan_resources =
				xilinx_dma_alloc_chan_resources;
	xdev->common.device_free_chan_resources =
				xilinx_dma_free_chan_resources;
	xdev->common.device_terminate_all = xilinx_dma_terminate_all;
	xdev->common.device_tx_status = xilinx_dma_tx_status;
	xdev->common.device_issue_pending = xilinx_dma_issue_pending;
	if (xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
		dma_cap_set(DMA_CYCLIC, xdev->common.cap_mask);
		xdev->common.device_prep_slave_sg = xilinx_dma_prep_slave_sg;
		xdev->common.device_prep_dma_cyclic =
					  xilinx_dma_prep_dma_cyclic;
		xdev->common.device_prep_interleaved_dma =
					xilinx_dma_prep_interleaved;
		/* Residue calculation is supported by only AXI DMA */
		xdev->common.residue_granularity =
					  DMA_RESIDUE_GRANULARITY_SEGMENT;
	} else if (xdev->dma_config->dmatype == XDMA_TYPE_CDMA) {
		dma_cap_set(DMA_MEMCPY, xdev->common.cap_mask);
		xdev->common.device_prep_dma_memcpy = xilinx_cdma_prep_memcpy;
	} else {
		xdev->common.device_prep_interleaved_dma =
				xilinx_vdma_dma_prep_interleaved;
	}

	platform_set_drvdata(pdev, xdev);

	/* Initialize the channels */
	for_each_child_of_node(node, child) {
		err = xilinx_dma_child_probe(xdev, child);
		if (err < 0)
			goto disable_clks;
	}

	if (xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
		for (i = 0; i < xdev->nr_channels; i++)
			if (xdev->chan[i])
				xdev->chan[i]->num_frms = num_frames;
	}

	/* Register the DMA engine with the core */
	dma_async_device_register(&xdev->common);

	err = of_dma_controller_register(node, of_dma_xilinx_xlate,
					 xdev);
	if (err < 0) {
		dev_err(&pdev->dev, "Unable to register DMA to DT\n");
		dma_async_device_unregister(&xdev->common);
		goto error;
	}

	dev_info(&pdev->dev, "Xilinx AXI VDMA Engine Driver Probed!!\n");

	return 0;

disable_clks:
	xdma_disable_allclks(xdev);
error:
	for (i = 0; i < xdev->nr_channels; i++)
		if (xdev->chan[i])
			xilinx_dma_chan_remove(xdev->chan[i]);

	return err;
}

/**
 * xilinx_dma_remove - Driver remove function
 * @pdev: Pointer to the platform_device structure
 *
 * Return: Always '0'
 */
static int xilinx_dma_remove(struct platform_device *pdev)
{
	struct xilinx_dma_device *xdev = platform_get_drvdata(pdev);
	int i;

	of_dma_controller_free(pdev->dev.of_node);

	dma_async_device_unregister(&xdev->common);

	for (i = 0; i < xdev->nr_channels; i++)
		if (xdev->chan[i])
			xilinx_dma_chan_remove(xdev->chan[i]);

	xdma_disable_allclks(xdev);

	return 0;
}

static struct platform_driver xilinx_vdma_driver = {
	.driver = {
		.name = "xilinx-vdma",
		.of_match_table = xilinx_dma_of_ids,
	},
	.probe = xilinx_dma_probe,
	.remove = xilinx_dma_remove,
};

module_platform_driver(xilinx_vdma_driver);

MODULE_AUTHOR("Xilinx, Inc.");
MODULE_DESCRIPTION("Xilinx VDMA driver");
MODULE_LICENSE("GPL v2");