summaryrefslogtreecommitdiff
path: root/drivers/net/ethernet/broadcom/genet/bcmgenet.c
blob: da1a2500c91ce43677e7cada4b66196c17af2513 (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
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
/*
 * Broadcom GENET (Gigabit Ethernet) controller driver
 *
 * Copyright (c) 2014 Broadcom Corporation
 *
 * 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.
 */

#define pr_fmt(fmt)				"bcmgenet: " fmt

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/string.h>
#include <linux/if_ether.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/pm.h>
#include <linux/clk.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_net.h>
#include <linux/of_platform.h>
#include <net/arp.h>

#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/phy.h>

#include <asm/unaligned.h>

#include "bcmgenet.h"

/* Maximum number of hardware queues, downsized if needed */
#define GENET_MAX_MQ_CNT	4

/* Default highest priority queue for multi queue support */
#define GENET_Q0_PRIORITY	0

#define GENET_DEFAULT_BD_CNT	\
	(TOTAL_DESC - priv->hw_params->tx_queues * priv->hw_params->bds_cnt)

#define RX_BUF_LENGTH		2048
#define SKB_ALIGNMENT		32

/* Tx/Rx DMA register offset, skip 256 descriptors */
#define WORDS_PER_BD(p)		(p->hw_params->words_per_bd)
#define DMA_DESC_SIZE		(WORDS_PER_BD(priv) * sizeof(u32))

#define GENET_TDMA_REG_OFF	(priv->hw_params->tdma_offset + \
				TOTAL_DESC * DMA_DESC_SIZE)

#define GENET_RDMA_REG_OFF	(priv->hw_params->rdma_offset + \
				TOTAL_DESC * DMA_DESC_SIZE)

static inline void dmadesc_set_length_status(struct bcmgenet_priv *priv,
					     void __iomem *d, u32 value)
{
	__raw_writel(value, d + DMA_DESC_LENGTH_STATUS);
}

static inline u32 dmadesc_get_length_status(struct bcmgenet_priv *priv,
					    void __iomem *d)
{
	return __raw_readl(d + DMA_DESC_LENGTH_STATUS);
}

static inline void dmadesc_set_addr(struct bcmgenet_priv *priv,
				    void __iomem *d,
				    dma_addr_t addr)
{
	__raw_writel(lower_32_bits(addr), d + DMA_DESC_ADDRESS_LO);

	/* Register writes to GISB bus can take couple hundred nanoseconds
	 * and are done for each packet, save these expensive writes unless
	 * the platform is explicitly configured for 64-bits/LPAE.
	 */
#ifdef CONFIG_PHYS_ADDR_T_64BIT
	if (priv->hw_params->flags & GENET_HAS_40BITS)
		__raw_writel(upper_32_bits(addr), d + DMA_DESC_ADDRESS_HI);
#endif
}

/* Combined address + length/status setter */
static inline void dmadesc_set(struct bcmgenet_priv *priv,
			       void __iomem *d, dma_addr_t addr, u32 val)
{
	dmadesc_set_length_status(priv, d, val);
	dmadesc_set_addr(priv, d, addr);
}

static inline dma_addr_t dmadesc_get_addr(struct bcmgenet_priv *priv,
					  void __iomem *d)
{
	dma_addr_t addr;

	addr = __raw_readl(d + DMA_DESC_ADDRESS_LO);

	/* Register writes to GISB bus can take couple hundred nanoseconds
	 * and are done for each packet, save these expensive writes unless
	 * the platform is explicitly configured for 64-bits/LPAE.
	 */
#ifdef CONFIG_PHYS_ADDR_T_64BIT
	if (priv->hw_params->flags & GENET_HAS_40BITS)
		addr |= (u64)__raw_readl(d + DMA_DESC_ADDRESS_HI) << 32;
#endif
	return addr;
}

#define GENET_VER_FMT	"%1d.%1d EPHY: 0x%04x"

#define GENET_MSG_DEFAULT	(NETIF_MSG_DRV | NETIF_MSG_PROBE | \
				NETIF_MSG_LINK)

static inline u32 bcmgenet_rbuf_ctrl_get(struct bcmgenet_priv *priv)
{
	if (GENET_IS_V1(priv))
		return bcmgenet_rbuf_readl(priv, RBUF_FLUSH_CTRL_V1);
	else
		return bcmgenet_sys_readl(priv, SYS_RBUF_FLUSH_CTRL);
}

static inline void bcmgenet_rbuf_ctrl_set(struct bcmgenet_priv *priv, u32 val)
{
	if (GENET_IS_V1(priv))
		bcmgenet_rbuf_writel(priv, val, RBUF_FLUSH_CTRL_V1);
	else
		bcmgenet_sys_writel(priv, val, SYS_RBUF_FLUSH_CTRL);
}

/* These macros are defined to deal with register map change
 * between GENET1.1 and GENET2. Only those currently being used
 * by driver are defined.
 */
static inline u32 bcmgenet_tbuf_ctrl_get(struct bcmgenet_priv *priv)
{
	if (GENET_IS_V1(priv))
		return bcmgenet_rbuf_readl(priv, TBUF_CTRL_V1);
	else
		return __raw_readl(priv->base +
				priv->hw_params->tbuf_offset + TBUF_CTRL);
}

static inline void bcmgenet_tbuf_ctrl_set(struct bcmgenet_priv *priv, u32 val)
{
	if (GENET_IS_V1(priv))
		bcmgenet_rbuf_writel(priv, val, TBUF_CTRL_V1);
	else
		__raw_writel(val, priv->base +
				priv->hw_params->tbuf_offset + TBUF_CTRL);
}

static inline u32 bcmgenet_bp_mc_get(struct bcmgenet_priv *priv)
{
	if (GENET_IS_V1(priv))
		return bcmgenet_rbuf_readl(priv, TBUF_BP_MC_V1);
	else
		return __raw_readl(priv->base +
				priv->hw_params->tbuf_offset + TBUF_BP_MC);
}

static inline void bcmgenet_bp_mc_set(struct bcmgenet_priv *priv, u32 val)
{
	if (GENET_IS_V1(priv))
		bcmgenet_rbuf_writel(priv, val, TBUF_BP_MC_V1);
	else
		__raw_writel(val, priv->base +
				priv->hw_params->tbuf_offset + TBUF_BP_MC);
}

/* RX/TX DMA register accessors */
enum dma_reg {
	DMA_RING_CFG = 0,
	DMA_CTRL,
	DMA_STATUS,
	DMA_SCB_BURST_SIZE,
	DMA_ARB_CTRL,
	DMA_PRIORITY_0,
	DMA_PRIORITY_1,
	DMA_PRIORITY_2,
};

static const u8 bcmgenet_dma_regs_v3plus[] = {
	[DMA_RING_CFG]		= 0x00,
	[DMA_CTRL]		= 0x04,
	[DMA_STATUS]		= 0x08,
	[DMA_SCB_BURST_SIZE]	= 0x0C,
	[DMA_ARB_CTRL]		= 0x2C,
	[DMA_PRIORITY_0]	= 0x30,
	[DMA_PRIORITY_1]	= 0x34,
	[DMA_PRIORITY_2]	= 0x38,
};

static const u8 bcmgenet_dma_regs_v2[] = {
	[DMA_RING_CFG]		= 0x00,
	[DMA_CTRL]		= 0x04,
	[DMA_STATUS]		= 0x08,
	[DMA_SCB_BURST_SIZE]	= 0x0C,
	[DMA_ARB_CTRL]		= 0x30,
	[DMA_PRIORITY_0]	= 0x34,
	[DMA_PRIORITY_1]	= 0x38,
	[DMA_PRIORITY_2]	= 0x3C,
};

static const u8 bcmgenet_dma_regs_v1[] = {
	[DMA_CTRL]		= 0x00,
	[DMA_STATUS]		= 0x04,
	[DMA_SCB_BURST_SIZE]	= 0x0C,
	[DMA_ARB_CTRL]		= 0x30,
	[DMA_PRIORITY_0]	= 0x34,
	[DMA_PRIORITY_1]	= 0x38,
	[DMA_PRIORITY_2]	= 0x3C,
};

/* Set at runtime once bcmgenet version is known */
static const u8 *bcmgenet_dma_regs;

static inline struct bcmgenet_priv *dev_to_priv(struct device *dev)
{
	return netdev_priv(dev_get_drvdata(dev));
}

static inline u32 bcmgenet_tdma_readl(struct bcmgenet_priv *priv,
				      enum dma_reg r)
{
	return __raw_readl(priv->base + GENET_TDMA_REG_OFF +
			DMA_RINGS_SIZE + bcmgenet_dma_regs[r]);
}

static inline void bcmgenet_tdma_writel(struct bcmgenet_priv *priv,
					u32 val, enum dma_reg r)
{
	__raw_writel(val, priv->base + GENET_TDMA_REG_OFF +
			DMA_RINGS_SIZE + bcmgenet_dma_regs[r]);
}

static inline u32 bcmgenet_rdma_readl(struct bcmgenet_priv *priv,
				      enum dma_reg r)
{
	return __raw_readl(priv->base + GENET_RDMA_REG_OFF +
			DMA_RINGS_SIZE + bcmgenet_dma_regs[r]);
}

static inline void bcmgenet_rdma_writel(struct bcmgenet_priv *priv,
					u32 val, enum dma_reg r)
{
	__raw_writel(val, priv->base + GENET_RDMA_REG_OFF +
			DMA_RINGS_SIZE + bcmgenet_dma_regs[r]);
}

/* RDMA/TDMA ring registers and accessors
 * we merge the common fields and just prefix with T/D the registers
 * having different meaning depending on the direction
 */
enum dma_ring_reg {
	TDMA_READ_PTR = 0,
	RDMA_WRITE_PTR = TDMA_READ_PTR,
	TDMA_READ_PTR_HI,
	RDMA_WRITE_PTR_HI = TDMA_READ_PTR_HI,
	TDMA_CONS_INDEX,
	RDMA_PROD_INDEX = TDMA_CONS_INDEX,
	TDMA_PROD_INDEX,
	RDMA_CONS_INDEX = TDMA_PROD_INDEX,
	DMA_RING_BUF_SIZE,
	DMA_START_ADDR,
	DMA_START_ADDR_HI,
	DMA_END_ADDR,
	DMA_END_ADDR_HI,
	DMA_MBUF_DONE_THRESH,
	TDMA_FLOW_PERIOD,
	RDMA_XON_XOFF_THRESH = TDMA_FLOW_PERIOD,
	TDMA_WRITE_PTR,
	RDMA_READ_PTR = TDMA_WRITE_PTR,
	TDMA_WRITE_PTR_HI,
	RDMA_READ_PTR_HI = TDMA_WRITE_PTR_HI
};

/* GENET v4 supports 40-bits pointer addressing
 * for obvious reasons the LO and HI word parts
 * are contiguous, but this offsets the other
 * registers.
 */
static const u8 genet_dma_ring_regs_v4[] = {
	[TDMA_READ_PTR]			= 0x00,
	[TDMA_READ_PTR_HI]		= 0x04,
	[TDMA_CONS_INDEX]		= 0x08,
	[TDMA_PROD_INDEX]		= 0x0C,
	[DMA_RING_BUF_SIZE]		= 0x10,
	[DMA_START_ADDR]		= 0x14,
	[DMA_START_ADDR_HI]		= 0x18,
	[DMA_END_ADDR]			= 0x1C,
	[DMA_END_ADDR_HI]		= 0x20,
	[DMA_MBUF_DONE_THRESH]		= 0x24,
	[TDMA_FLOW_PERIOD]		= 0x28,
	[TDMA_WRITE_PTR]		= 0x2C,
	[TDMA_WRITE_PTR_HI]		= 0x30,
};

static const u8 genet_dma_ring_regs_v123[] = {
	[TDMA_READ_PTR]			= 0x00,
	[TDMA_CONS_INDEX]		= 0x04,
	[TDMA_PROD_INDEX]		= 0x08,
	[DMA_RING_BUF_SIZE]		= 0x0C,
	[DMA_START_ADDR]		= 0x10,
	[DMA_END_ADDR]			= 0x14,
	[DMA_MBUF_DONE_THRESH]		= 0x18,
	[TDMA_FLOW_PERIOD]		= 0x1C,
	[TDMA_WRITE_PTR]		= 0x20,
};

/* Set at runtime once GENET version is known */
static const u8 *genet_dma_ring_regs;

static inline u32 bcmgenet_tdma_ring_readl(struct bcmgenet_priv *priv,
					   unsigned int ring,
					   enum dma_ring_reg r)
{
	return __raw_readl(priv->base + GENET_TDMA_REG_OFF +
			(DMA_RING_SIZE * ring) +
			genet_dma_ring_regs[r]);
}

static inline void bcmgenet_tdma_ring_writel(struct bcmgenet_priv *priv,
					     unsigned int ring, u32 val,
					     enum dma_ring_reg r)
{
	__raw_writel(val, priv->base + GENET_TDMA_REG_OFF +
			(DMA_RING_SIZE * ring) +
			genet_dma_ring_regs[r]);
}

static inline u32 bcmgenet_rdma_ring_readl(struct bcmgenet_priv *priv,
					   unsigned int ring,
					   enum dma_ring_reg r)
{
	return __raw_readl(priv->base + GENET_RDMA_REG_OFF +
			(DMA_RING_SIZE * ring) +
			genet_dma_ring_regs[r]);
}

static inline void bcmgenet_rdma_ring_writel(struct bcmgenet_priv *priv,
					     unsigned int ring, u32 val,
					     enum dma_ring_reg r)
{
	__raw_writel(val, priv->base + GENET_RDMA_REG_OFF +
			(DMA_RING_SIZE * ring) +
			genet_dma_ring_regs[r]);
}

static int bcmgenet_get_settings(struct net_device *dev,
				 struct ethtool_cmd *cmd)
{
	struct bcmgenet_priv *priv = netdev_priv(dev);

	if (!netif_running(dev))
		return -EINVAL;

	if (!priv->phydev)
		return -ENODEV;

	return phy_ethtool_gset(priv->phydev, cmd);
}

static int bcmgenet_set_settings(struct net_device *dev,
				 struct ethtool_cmd *cmd)
{
	struct bcmgenet_priv *priv = netdev_priv(dev);

	if (!netif_running(dev))
		return -EINVAL;

	if (!priv->phydev)
		return -ENODEV;

	return phy_ethtool_sset(priv->phydev, cmd);
}

static int bcmgenet_set_rx_csum(struct net_device *dev,
				netdev_features_t wanted)
{
	struct bcmgenet_priv *priv = netdev_priv(dev);
	u32 rbuf_chk_ctrl;
	bool rx_csum_en;

	rx_csum_en = !!(wanted & NETIF_F_RXCSUM);

	rbuf_chk_ctrl = bcmgenet_rbuf_readl(priv, RBUF_CHK_CTRL);

	/* enable rx checksumming */
	if (rx_csum_en)
		rbuf_chk_ctrl |= RBUF_RXCHK_EN;
	else
		rbuf_chk_ctrl &= ~RBUF_RXCHK_EN;
	priv->desc_rxchk_en = rx_csum_en;

	/* If UniMAC forwards CRC, we need to skip over it to get
	 * a valid CHK bit to be set in the per-packet status word
	*/
	if (rx_csum_en && priv->crc_fwd_en)
		rbuf_chk_ctrl |= RBUF_SKIP_FCS;
	else
		rbuf_chk_ctrl &= ~RBUF_SKIP_FCS;

	bcmgenet_rbuf_writel(priv, rbuf_chk_ctrl, RBUF_CHK_CTRL);

	return 0;
}

static int bcmgenet_set_tx_csum(struct net_device *dev,
				netdev_features_t wanted)
{
	struct bcmgenet_priv *priv = netdev_priv(dev);
	bool desc_64b_en;
	u32 tbuf_ctrl, rbuf_ctrl;

	tbuf_ctrl = bcmgenet_tbuf_ctrl_get(priv);
	rbuf_ctrl = bcmgenet_rbuf_readl(priv, RBUF_CTRL);

	desc_64b_en = !!(wanted & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM));

	/* enable 64 bytes descriptor in both directions (RBUF and TBUF) */
	if (desc_64b_en) {
		tbuf_ctrl |= RBUF_64B_EN;
		rbuf_ctrl |= RBUF_64B_EN;
	} else {
		tbuf_ctrl &= ~RBUF_64B_EN;
		rbuf_ctrl &= ~RBUF_64B_EN;
	}
	priv->desc_64b_en = desc_64b_en;

	bcmgenet_tbuf_ctrl_set(priv, tbuf_ctrl);
	bcmgenet_rbuf_writel(priv, rbuf_ctrl, RBUF_CTRL);

	return 0;
}

static int bcmgenet_set_features(struct net_device *dev,
				 netdev_features_t features)
{
	netdev_features_t changed = features ^ dev->features;
	netdev_features_t wanted = dev->wanted_features;
	int ret = 0;

	if (changed & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM))
		ret = bcmgenet_set_tx_csum(dev, wanted);
	if (changed & (NETIF_F_RXCSUM))
		ret = bcmgenet_set_rx_csum(dev, wanted);

	return ret;
}

static u32 bcmgenet_get_msglevel(struct net_device *dev)
{
	struct bcmgenet_priv *priv = netdev_priv(dev);

	return priv->msg_enable;
}

static void bcmgenet_set_msglevel(struct net_device *dev, u32 level)
{
	struct bcmgenet_priv *priv = netdev_priv(dev);

	priv->msg_enable = level;
}

/* standard ethtool support functions. */
enum bcmgenet_stat_type {
	BCMGENET_STAT_NETDEV = -1,
	BCMGENET_STAT_MIB_RX,
	BCMGENET_STAT_MIB_TX,
	BCMGENET_STAT_RUNT,
	BCMGENET_STAT_MISC,
};

struct bcmgenet_stats {
	char stat_string[ETH_GSTRING_LEN];
	int stat_sizeof;
	int stat_offset;
	enum bcmgenet_stat_type type;
	/* reg offset from UMAC base for misc counters */
	u16 reg_offset;
};

#define STAT_NETDEV(m) { \
	.stat_string = __stringify(m), \
	.stat_sizeof = sizeof(((struct net_device_stats *)0)->m), \
	.stat_offset = offsetof(struct net_device_stats, m), \
	.type = BCMGENET_STAT_NETDEV, \
}

#define STAT_GENET_MIB(str, m, _type) { \
	.stat_string = str, \
	.stat_sizeof = sizeof(((struct bcmgenet_priv *)0)->m), \
	.stat_offset = offsetof(struct bcmgenet_priv, m), \
	.type = _type, \
}

#define STAT_GENET_MIB_RX(str, m) STAT_GENET_MIB(str, m, BCMGENET_STAT_MIB_RX)
#define STAT_GENET_MIB_TX(str, m) STAT_GENET_MIB(str, m, BCMGENET_STAT_MIB_TX)
#define STAT_GENET_RUNT(str, m) STAT_GENET_MIB(str, m, BCMGENET_STAT_RUNT)

#define STAT_GENET_MISC(str, m, offset) { \
	.stat_string = str, \
	.stat_sizeof = sizeof(((struct bcmgenet_priv *)0)->m), \
	.stat_offset = offsetof(struct bcmgenet_priv, m), \
	.type = BCMGENET_STAT_MISC, \
	.reg_offset = offset, \
}


/* There is a 0xC gap between the end of RX and beginning of TX stats and then
 * between the end of TX stats and the beginning of the RX RUNT
 */
#define BCMGENET_STAT_OFFSET	0xc

/* Hardware counters must be kept in sync because the order/offset
 * is important here (order in structure declaration = order in hardware)
 */
static const struct bcmgenet_stats bcmgenet_gstrings_stats[] = {
	/* general stats */
	STAT_NETDEV(rx_packets),
	STAT_NETDEV(tx_packets),
	STAT_NETDEV(rx_bytes),
	STAT_NETDEV(tx_bytes),
	STAT_NETDEV(rx_errors),
	STAT_NETDEV(tx_errors),
	STAT_NETDEV(rx_dropped),
	STAT_NETDEV(tx_dropped),
	STAT_NETDEV(multicast),
	/* UniMAC RSV counters */
	STAT_GENET_MIB_RX("rx_64_octets", mib.rx.pkt_cnt.cnt_64),
	STAT_GENET_MIB_RX("rx_65_127_oct", mib.rx.pkt_cnt.cnt_127),
	STAT_GENET_MIB_RX("rx_128_255_oct", mib.rx.pkt_cnt.cnt_255),
	STAT_GENET_MIB_RX("rx_256_511_oct", mib.rx.pkt_cnt.cnt_511),
	STAT_GENET_MIB_RX("rx_512_1023_oct", mib.rx.pkt_cnt.cnt_1023),
	STAT_GENET_MIB_RX("rx_1024_1518_oct", mib.rx.pkt_cnt.cnt_1518),
	STAT_GENET_MIB_RX("rx_vlan_1519_1522_oct", mib.rx.pkt_cnt.cnt_mgv),
	STAT_GENET_MIB_RX("rx_1522_2047_oct", mib.rx.pkt_cnt.cnt_2047),
	STAT_GENET_MIB_RX("rx_2048_4095_oct", mib.rx.pkt_cnt.cnt_4095),
	STAT_GENET_MIB_RX("rx_4096_9216_oct", mib.rx.pkt_cnt.cnt_9216),
	STAT_GENET_MIB_RX("rx_pkts", mib.rx.pkt),
	STAT_GENET_MIB_RX("rx_bytes", mib.rx.bytes),
	STAT_GENET_MIB_RX("rx_multicast", mib.rx.mca),
	STAT_GENET_MIB_RX("rx_broadcast", mib.rx.bca),
	STAT_GENET_MIB_RX("rx_fcs", mib.rx.fcs),
	STAT_GENET_MIB_RX("rx_control", mib.rx.cf),
	STAT_GENET_MIB_RX("rx_pause", mib.rx.pf),
	STAT_GENET_MIB_RX("rx_unknown", mib.rx.uo),
	STAT_GENET_MIB_RX("rx_align", mib.rx.aln),
	STAT_GENET_MIB_RX("rx_outrange", mib.rx.flr),
	STAT_GENET_MIB_RX("rx_code", mib.rx.cde),
	STAT_GENET_MIB_RX("rx_carrier", mib.rx.fcr),
	STAT_GENET_MIB_RX("rx_oversize", mib.rx.ovr),
	STAT_GENET_MIB_RX("rx_jabber", mib.rx.jbr),
	STAT_GENET_MIB_RX("rx_mtu_err", mib.rx.mtue),
	STAT_GENET_MIB_RX("rx_good_pkts", mib.rx.pok),
	STAT_GENET_MIB_RX("rx_unicast", mib.rx.uc),
	STAT_GENET_MIB_RX("rx_ppp", mib.rx.ppp),
	STAT_GENET_MIB_RX("rx_crc", mib.rx.rcrc),
	/* UniMAC TSV counters */
	STAT_GENET_MIB_TX("tx_64_octets", mib.tx.pkt_cnt.cnt_64),
	STAT_GENET_MIB_TX("tx_65_127_oct", mib.tx.pkt_cnt.cnt_127),
	STAT_GENET_MIB_TX("tx_128_255_oct", mib.tx.pkt_cnt.cnt_255),
	STAT_GENET_MIB_TX("tx_256_511_oct", mib.tx.pkt_cnt.cnt_511),
	STAT_GENET_MIB_TX("tx_512_1023_oct", mib.tx.pkt_cnt.cnt_1023),
	STAT_GENET_MIB_TX("tx_1024_1518_oct", mib.tx.pkt_cnt.cnt_1518),
	STAT_GENET_MIB_TX("tx_vlan_1519_1522_oct", mib.tx.pkt_cnt.cnt_mgv),
	STAT_GENET_MIB_TX("tx_1522_2047_oct", mib.tx.pkt_cnt.cnt_2047),
	STAT_GENET_MIB_TX("tx_2048_4095_oct", mib.tx.pkt_cnt.cnt_4095),
	STAT_GENET_MIB_TX("tx_4096_9216_oct", mib.tx.pkt_cnt.cnt_9216),
	STAT_GENET_MIB_TX("tx_pkts", mib.tx.pkts),
	STAT_GENET_MIB_TX("tx_multicast", mib.tx.mca),
	STAT_GENET_MIB_TX("tx_broadcast", mib.tx.bca),
	STAT_GENET_MIB_TX("tx_pause", mib.tx.pf),
	STAT_GENET_MIB_TX("tx_control", mib.tx.cf),
	STAT_GENET_MIB_TX("tx_fcs_err", mib.tx.fcs),
	STAT_GENET_MIB_TX("tx_oversize", mib.tx.ovr),
	STAT_GENET_MIB_TX("tx_defer", mib.tx.drf),
	STAT_GENET_MIB_TX("tx_excess_defer", mib.tx.edf),
	STAT_GENET_MIB_TX("tx_single_col", mib.tx.scl),
	STAT_GENET_MIB_TX("tx_multi_col", mib.tx.mcl),
	STAT_GENET_MIB_TX("tx_late_col", mib.tx.lcl),
	STAT_GENET_MIB_TX("tx_excess_col", mib.tx.ecl),
	STAT_GENET_MIB_TX("tx_frags", mib.tx.frg),
	STAT_GENET_MIB_TX("tx_total_col", mib.tx.ncl),
	STAT_GENET_MIB_TX("tx_jabber", mib.tx.jbr),
	STAT_GENET_MIB_TX("tx_bytes", mib.tx.bytes),
	STAT_GENET_MIB_TX("tx_good_pkts", mib.tx.pok),
	STAT_GENET_MIB_TX("tx_unicast", mib.tx.uc),
	/* UniMAC RUNT counters */
	STAT_GENET_RUNT("rx_runt_pkts", mib.rx_runt_cnt),
	STAT_GENET_RUNT("rx_runt_valid_fcs", mib.rx_runt_fcs),
	STAT_GENET_RUNT("rx_runt_inval_fcs_align", mib.rx_runt_fcs_align),
	STAT_GENET_RUNT("rx_runt_bytes", mib.rx_runt_bytes),
	/* Misc UniMAC counters */
	STAT_GENET_MISC("rbuf_ovflow_cnt", mib.rbuf_ovflow_cnt,
			UMAC_RBUF_OVFL_CNT),
	STAT_GENET_MISC("rbuf_err_cnt", mib.rbuf_err_cnt, UMAC_RBUF_ERR_CNT),
	STAT_GENET_MISC("mdf_err_cnt", mib.mdf_err_cnt, UMAC_MDF_ERR_CNT),
};

#define BCMGENET_STATS_LEN	ARRAY_SIZE(bcmgenet_gstrings_stats)

static void bcmgenet_get_drvinfo(struct net_device *dev,
				 struct ethtool_drvinfo *info)
{
	strlcpy(info->driver, "bcmgenet", sizeof(info->driver));
	strlcpy(info->version, "v2.0", sizeof(info->version));
	info->n_stats = BCMGENET_STATS_LEN;
}

static int bcmgenet_get_sset_count(struct net_device *dev, int string_set)
{
	switch (string_set) {
	case ETH_SS_STATS:
		return BCMGENET_STATS_LEN;
	default:
		return -EOPNOTSUPP;
	}
}

static void bcmgenet_get_strings(struct net_device *dev, u32 stringset,
				 u8 *data)
{
	int i;

	switch (stringset) {
	case ETH_SS_STATS:
		for (i = 0; i < BCMGENET_STATS_LEN; i++) {
			memcpy(data + i * ETH_GSTRING_LEN,
			       bcmgenet_gstrings_stats[i].stat_string,
			       ETH_GSTRING_LEN);
		}
		break;
	}
}

static void bcmgenet_update_mib_counters(struct bcmgenet_priv *priv)
{
	int i, j = 0;

	for (i = 0; i < BCMGENET_STATS_LEN; i++) {
		const struct bcmgenet_stats *s;
		u8 offset = 0;
		u32 val = 0;
		char *p;

		s = &bcmgenet_gstrings_stats[i];
		switch (s->type) {
		case BCMGENET_STAT_NETDEV:
			continue;
		case BCMGENET_STAT_MIB_RX:
		case BCMGENET_STAT_MIB_TX:
		case BCMGENET_STAT_RUNT:
			if (s->type != BCMGENET_STAT_MIB_RX)
				offset = BCMGENET_STAT_OFFSET;
			val = bcmgenet_umac_readl(priv,
						  UMAC_MIB_START + j + offset);
			break;
		case BCMGENET_STAT_MISC:
			val = bcmgenet_umac_readl(priv, s->reg_offset);
			/* clear if overflowed */
			if (val == ~0)
				bcmgenet_umac_writel(priv, 0, s->reg_offset);
			break;
		}

		j += s->stat_sizeof;
		p = (char *)priv + s->stat_offset;
		*(u32 *)p = val;
	}
}

static void bcmgenet_get_ethtool_stats(struct net_device *dev,
				       struct ethtool_stats *stats,
				       u64 *data)
{
	struct bcmgenet_priv *priv = netdev_priv(dev);
	int i;

	if (netif_running(dev))
		bcmgenet_update_mib_counters(priv);

	for (i = 0; i < BCMGENET_STATS_LEN; i++) {
		const struct bcmgenet_stats *s;
		char *p;

		s = &bcmgenet_gstrings_stats[i];
		if (s->type == BCMGENET_STAT_NETDEV)
			p = (char *)&dev->stats;
		else
			p = (char *)priv;
		p += s->stat_offset;
		data[i] = *(u32 *)p;
	}
}

/* standard ethtool support functions. */
static struct ethtool_ops bcmgenet_ethtool_ops = {
	.get_strings		= bcmgenet_get_strings,
	.get_sset_count		= bcmgenet_get_sset_count,
	.get_ethtool_stats	= bcmgenet_get_ethtool_stats,
	.get_settings		= bcmgenet_get_settings,
	.set_settings		= bcmgenet_set_settings,
	.get_drvinfo		= bcmgenet_get_drvinfo,
	.get_link		= ethtool_op_get_link,
	.get_msglevel		= bcmgenet_get_msglevel,
	.set_msglevel		= bcmgenet_set_msglevel,
	.get_wol		= bcmgenet_get_wol,
	.set_wol		= bcmgenet_set_wol,
};

/* Power down the unimac, based on mode. */
static void bcmgenet_power_down(struct bcmgenet_priv *priv,
				enum bcmgenet_power_mode mode)
{
	u32 reg;

	switch (mode) {
	case GENET_POWER_CABLE_SENSE:
		phy_detach(priv->phydev);
		break;

	case GENET_POWER_WOL_MAGIC:
		bcmgenet_wol_power_down_cfg(priv, mode);
		break;

	case GENET_POWER_PASSIVE:
		/* Power down LED */
		if (priv->hw_params->flags & GENET_HAS_EXT) {
			reg = bcmgenet_ext_readl(priv, EXT_EXT_PWR_MGMT);
			reg |= (EXT_PWR_DOWN_PHY |
				EXT_PWR_DOWN_DLL | EXT_PWR_DOWN_BIAS);
			bcmgenet_ext_writel(priv, reg, EXT_EXT_PWR_MGMT);
		}
		break;
	default:
		break;
	}
}

static void bcmgenet_power_up(struct bcmgenet_priv *priv,
			      enum bcmgenet_power_mode mode)
{
	u32 reg;

	if (!(priv->hw_params->flags & GENET_HAS_EXT))
		return;

	reg = bcmgenet_ext_readl(priv, EXT_EXT_PWR_MGMT);

	switch (mode) {
	case GENET_POWER_PASSIVE:
		reg &= ~(EXT_PWR_DOWN_DLL | EXT_PWR_DOWN_PHY |
				EXT_PWR_DOWN_BIAS);
		/* fallthrough */
	case GENET_POWER_CABLE_SENSE:
		/* enable APD */
		reg |= EXT_PWR_DN_EN_LD;
		break;
	case GENET_POWER_WOL_MAGIC:
		bcmgenet_wol_power_up_cfg(priv, mode);
		return;
	default:
		break;
	}

	bcmgenet_ext_writel(priv, reg, EXT_EXT_PWR_MGMT);

	if (mode == GENET_POWER_PASSIVE)
		bcmgenet_mii_reset(priv->dev);
}

/* ioctl handle special commands that are not present in ethtool. */
static int bcmgenet_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
	struct bcmgenet_priv *priv = netdev_priv(dev);
	int val = 0;

	if (!netif_running(dev))
		return -EINVAL;

	switch (cmd) {
	case SIOCGMIIPHY:
	case SIOCGMIIREG:
	case SIOCSMIIREG:
		if (!priv->phydev)
			val = -ENODEV;
		else
			val = phy_mii_ioctl(priv->phydev, rq, cmd);
		break;

	default:
		val = -EINVAL;
		break;
	}

	return val;
}

static struct enet_cb *bcmgenet_get_txcb(struct bcmgenet_priv *priv,
					 struct bcmgenet_tx_ring *ring)
{
	struct enet_cb *tx_cb_ptr;

	tx_cb_ptr = ring->cbs;
	tx_cb_ptr += ring->write_ptr - ring->cb_ptr;
	tx_cb_ptr->bd_addr = priv->tx_bds + ring->write_ptr * DMA_DESC_SIZE;
	/* Advancing local write pointer */
	if (ring->write_ptr == ring->end_ptr)
		ring->write_ptr = ring->cb_ptr;
	else
		ring->write_ptr++;

	return tx_cb_ptr;
}

/* Simple helper to free a control block's resources */
static void bcmgenet_free_cb(struct enet_cb *cb)
{
	dev_kfree_skb_any(cb->skb);
	cb->skb = NULL;
	dma_unmap_addr_set(cb, dma_addr, 0);
}

static inline void bcmgenet_tx_ring16_int_disable(struct bcmgenet_priv *priv,
						  struct bcmgenet_tx_ring *ring)
{
	bcmgenet_intrl2_0_writel(priv,
				 UMAC_IRQ_TXDMA_BDONE | UMAC_IRQ_TXDMA_PDONE,
				 INTRL2_CPU_MASK_SET);
}

static inline void bcmgenet_tx_ring16_int_enable(struct bcmgenet_priv *priv,
						 struct bcmgenet_tx_ring *ring)
{
	bcmgenet_intrl2_0_writel(priv,
				 UMAC_IRQ_TXDMA_BDONE | UMAC_IRQ_TXDMA_PDONE,
				 INTRL2_CPU_MASK_CLEAR);
}

static inline void bcmgenet_tx_ring_int_enable(struct bcmgenet_priv *priv,
					       struct bcmgenet_tx_ring *ring)
{
	bcmgenet_intrl2_1_writel(priv, (1 << ring->index),
				 INTRL2_CPU_MASK_CLEAR);
	priv->int1_mask &= ~(1 << ring->index);
}

static inline void bcmgenet_tx_ring_int_disable(struct bcmgenet_priv *priv,
						struct bcmgenet_tx_ring *ring)
{
	bcmgenet_intrl2_1_writel(priv, (1 << ring->index),
				 INTRL2_CPU_MASK_SET);
	priv->int1_mask |= (1 << ring->index);
}

/* Unlocked version of the reclaim routine */
static void __bcmgenet_tx_reclaim(struct net_device *dev,
				  struct bcmgenet_tx_ring *ring)
{
	struct bcmgenet_priv *priv = netdev_priv(dev);
	int last_tx_cn, last_c_index, num_tx_bds;
	struct enet_cb *tx_cb_ptr;
	struct netdev_queue *txq;
	unsigned int bds_compl;
	unsigned int c_index;

	/* Compute how many buffers are transmitted since last xmit call */
	c_index = bcmgenet_tdma_ring_readl(priv, ring->index, TDMA_CONS_INDEX);
	txq = netdev_get_tx_queue(dev, ring->queue);

	last_c_index = ring->c_index;
	num_tx_bds = ring->size;

	c_index &= (num_tx_bds - 1);

	if (c_index >= last_c_index)
		last_tx_cn = c_index - last_c_index;
	else
		last_tx_cn = num_tx_bds - last_c_index + c_index;

	netif_dbg(priv, tx_done, dev,
		  "%s ring=%d index=%d last_tx_cn=%d last_index=%d\n",
		  __func__, ring->index,
		  c_index, last_tx_cn, last_c_index);

	/* Reclaim transmitted buffers */
	while (last_tx_cn-- > 0) {
		tx_cb_ptr = ring->cbs + last_c_index;
		bds_compl = 0;
		if (tx_cb_ptr->skb) {
			bds_compl = skb_shinfo(tx_cb_ptr->skb)->nr_frags + 1;
			dev->stats.tx_bytes += tx_cb_ptr->skb->len;
			dma_unmap_single(&dev->dev,
					 dma_unmap_addr(tx_cb_ptr, dma_addr),
					 tx_cb_ptr->skb->len,
					 DMA_TO_DEVICE);
			bcmgenet_free_cb(tx_cb_ptr);
		} else if (dma_unmap_addr(tx_cb_ptr, dma_addr)) {
			dev->stats.tx_bytes +=
				dma_unmap_len(tx_cb_ptr, dma_len);
			dma_unmap_page(&dev->dev,
				       dma_unmap_addr(tx_cb_ptr, dma_addr),
				       dma_unmap_len(tx_cb_ptr, dma_len),
				       DMA_TO_DEVICE);
			dma_unmap_addr_set(tx_cb_ptr, dma_addr, 0);
		}
		dev->stats.tx_packets++;
		ring->free_bds += bds_compl;

		last_c_index++;
		last_c_index &= (num_tx_bds - 1);
	}

	if (ring->free_bds > (MAX_SKB_FRAGS + 1))
		ring->int_disable(priv, ring);

	if (netif_tx_queue_stopped(txq))
		netif_tx_wake_queue(txq);

	ring->c_index = c_index;
}

static void bcmgenet_tx_reclaim(struct net_device *dev,
				struct bcmgenet_tx_ring *ring)
{
	unsigned long flags;

	spin_lock_irqsave(&ring->lock, flags);
	__bcmgenet_tx_reclaim(dev, ring);
	spin_unlock_irqrestore(&ring->lock, flags);
}

static void bcmgenet_tx_reclaim_all(struct net_device *dev)
{
	struct bcmgenet_priv *priv = netdev_priv(dev);
	int i;

	if (netif_is_multiqueue(dev)) {
		for (i = 0; i < priv->hw_params->tx_queues; i++)
			bcmgenet_tx_reclaim(dev, &priv->tx_rings[i]);
	}

	bcmgenet_tx_reclaim(dev, &priv->tx_rings[DESC_INDEX]);
}

/* Transmits a single SKB (either head of a fragment or a single SKB)
 * caller must hold priv->lock
 */
static int bcmgenet_xmit_single(struct net_device *dev,
				struct sk_buff *skb,
				u16 dma_desc_flags,
				struct bcmgenet_tx_ring *ring)
{
	struct bcmgenet_priv *priv = netdev_priv(dev);
	struct device *kdev = &priv->pdev->dev;
	struct enet_cb *tx_cb_ptr;
	unsigned int skb_len;
	dma_addr_t mapping;
	u32 length_status;
	int ret;

	tx_cb_ptr = bcmgenet_get_txcb(priv, ring);

	if (unlikely(!tx_cb_ptr))
		BUG();

	tx_cb_ptr->skb = skb;

	skb_len = skb_headlen(skb) < ETH_ZLEN ? ETH_ZLEN : skb_headlen(skb);

	mapping = dma_map_single(kdev, skb->data, skb_len, DMA_TO_DEVICE);
	ret = dma_mapping_error(kdev, mapping);
	if (ret) {
		netif_err(priv, tx_err, dev, "Tx DMA map failed\n");
		dev_kfree_skb(skb);
		return ret;
	}

	dma_unmap_addr_set(tx_cb_ptr, dma_addr, mapping);
	dma_unmap_len_set(tx_cb_ptr, dma_len, skb->len);
	length_status = (skb_len << DMA_BUFLENGTH_SHIFT) | dma_desc_flags |
			(priv->hw_params->qtag_mask << DMA_TX_QTAG_SHIFT) |
			DMA_TX_APPEND_CRC;

	if (skb->ip_summed == CHECKSUM_PARTIAL)
		length_status |= DMA_TX_DO_CSUM;

	dmadesc_set(priv, tx_cb_ptr->bd_addr, mapping, length_status);

	/* Decrement total BD count and advance our write pointer */
	ring->free_bds -= 1;
	ring->prod_index += 1;
	ring->prod_index &= DMA_P_INDEX_MASK;

	return 0;
}

/* Transmit a SKB fragment */
static int bcmgenet_xmit_frag(struct net_device *dev,
			      skb_frag_t *frag,
			      u16 dma_desc_flags,
			      struct bcmgenet_tx_ring *ring)
{
	struct bcmgenet_priv *priv = netdev_priv(dev);
	struct device *kdev = &priv->pdev->dev;
	struct enet_cb *tx_cb_ptr;
	dma_addr_t mapping;
	int ret;

	tx_cb_ptr = bcmgenet_get_txcb(priv, ring);

	if (unlikely(!tx_cb_ptr))
		BUG();
	tx_cb_ptr->skb = NULL;

	mapping = skb_frag_dma_map(kdev, frag, 0,
				   skb_frag_size(frag), DMA_TO_DEVICE);
	ret = dma_mapping_error(kdev, mapping);
	if (ret) {
		netif_err(priv, tx_err, dev, "%s: Tx DMA map failed\n",
			  __func__);
		return ret;
	}

	dma_unmap_addr_set(tx_cb_ptr, dma_addr, mapping);
	dma_unmap_len_set(tx_cb_ptr, dma_len, frag->size);

	dmadesc_set(priv, tx_cb_ptr->bd_addr, mapping,
		    (frag->size << DMA_BUFLENGTH_SHIFT) | dma_desc_flags |
		    (priv->hw_params->qtag_mask << DMA_TX_QTAG_SHIFT));


	ring->free_bds -= 1;
	ring->prod_index += 1;
	ring->prod_index &= DMA_P_INDEX_MASK;

	return 0;
}

/* Reallocate the SKB to put enough headroom in front of it and insert
 * the transmit checksum offsets in the descriptors
 */
static struct sk_buff *bcmgenet_put_tx_csum(struct net_device *dev,
					    struct sk_buff *skb)
{
	struct status_64 *status = NULL;
	struct sk_buff *new_skb;
	u16 offset;
	u8 ip_proto;
	u16 ip_ver;
	u32 tx_csum_info;

	if (unlikely(skb_headroom(skb) < sizeof(*status))) {
		/* If 64 byte status block enabled, must make sure skb has
		 * enough headroom for us to insert 64B status block.
		 */
		new_skb = skb_realloc_headroom(skb, sizeof(*status));
		dev_kfree_skb(skb);
		if (!new_skb) {
			dev->stats.tx_errors++;
			dev->stats.tx_dropped++;
			return NULL;
		}
		skb = new_skb;
	}

	skb_push(skb, sizeof(*status));
	status = (struct status_64 *)skb->data;

	if (skb->ip_summed  == CHECKSUM_PARTIAL) {
		ip_ver = htons(skb->protocol);
		switch (ip_ver) {
		case ETH_P_IP:
			ip_proto = ip_hdr(skb)->protocol;
			break;
		case ETH_P_IPV6:
			ip_proto = ipv6_hdr(skb)->nexthdr;
			break;
		default:
			return skb;
		}

		offset = skb_checksum_start_offset(skb) - sizeof(*status);
		tx_csum_info = (offset << STATUS_TX_CSUM_START_SHIFT) |
				(offset + skb->csum_offset);

		/* Set the length valid bit for TCP and UDP and just set
		 * the special UDP flag for IPv4, else just set to 0.
		 */
		if (ip_proto == IPPROTO_TCP || ip_proto == IPPROTO_UDP) {
			tx_csum_info |= STATUS_TX_CSUM_LV;
			if (ip_proto == IPPROTO_UDP && ip_ver == ETH_P_IP)
				tx_csum_info |= STATUS_TX_CSUM_PROTO_UDP;
		} else {
			tx_csum_info = 0;
		}

		status->tx_csum_info = tx_csum_info;
	}

	return skb;
}

static netdev_tx_t bcmgenet_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct bcmgenet_priv *priv = netdev_priv(dev);
	struct bcmgenet_tx_ring *ring = NULL;
	struct netdev_queue *txq;
	unsigned long flags = 0;
	int nr_frags, index;
	u16 dma_desc_flags;
	int ret;
	int i;

	index = skb_get_queue_mapping(skb);
	/* Mapping strategy:
	 * queue_mapping = 0, unclassified, packet xmited through ring16
	 * queue_mapping = 1, goes to ring 0. (highest priority queue
	 * queue_mapping = 2, goes to ring 1.
	 * queue_mapping = 3, goes to ring 2.
	 * queue_mapping = 4, goes to ring 3.
	 */
	if (index == 0)
		index = DESC_INDEX;
	else
		index -= 1;

	nr_frags = skb_shinfo(skb)->nr_frags;
	ring = &priv->tx_rings[index];
	txq = netdev_get_tx_queue(dev, ring->queue);

	spin_lock_irqsave(&ring->lock, flags);
	if (ring->free_bds <= nr_frags + 1) {
		netif_tx_stop_queue(txq);
		netdev_err(dev, "%s: tx ring %d full when queue %d awake\n",
			   __func__, index, ring->queue);
		ret = NETDEV_TX_BUSY;
		goto out;
	}

	if (skb_padto(skb, ETH_ZLEN)) {
		ret = NETDEV_TX_OK;
		goto out;
	}

	/* set the SKB transmit checksum */
	if (priv->desc_64b_en) {
		skb = bcmgenet_put_tx_csum(dev, skb);
		if (!skb) {
			ret = NETDEV_TX_OK;
			goto out;
		}
	}

	dma_desc_flags = DMA_SOP;
	if (nr_frags == 0)
		dma_desc_flags |= DMA_EOP;

	/* Transmit single SKB or head of fragment list */
	ret = bcmgenet_xmit_single(dev, skb, dma_desc_flags, ring);
	if (ret) {
		ret = NETDEV_TX_OK;
		goto out;
	}

	/* xmit fragment */
	for (i = 0; i < nr_frags; i++) {
		ret = bcmgenet_xmit_frag(dev,
					 &skb_shinfo(skb)->frags[i],
					 (i == nr_frags - 1) ? DMA_EOP : 0,
					 ring);
		if (ret) {
			ret = NETDEV_TX_OK;
			goto out;
		}
	}

	skb_tx_timestamp(skb);

	/* we kept a software copy of how much we should advance the TDMA
	 * producer index, now write it down to the hardware
	 */
	bcmgenet_tdma_ring_writel(priv, ring->index,
				  ring->prod_index, TDMA_PROD_INDEX);

	if (ring->free_bds <= (MAX_SKB_FRAGS + 1)) {
		netif_tx_stop_queue(txq);
		ring->int_enable(priv, ring);
	}

out:
	spin_unlock_irqrestore(&ring->lock, flags);

	return ret;
}


static int bcmgenet_rx_refill(struct bcmgenet_priv *priv, struct enet_cb *cb)
{
	struct device *kdev = &priv->pdev->dev;
	struct sk_buff *skb;
	dma_addr_t mapping;
	int ret;

	skb = netdev_alloc_skb(priv->dev, priv->rx_buf_len + SKB_ALIGNMENT);
	if (!skb)
		return -ENOMEM;

	/* a caller did not release this control block */
	WARN_ON(cb->skb != NULL);
	cb->skb = skb;
	mapping = dma_map_single(kdev, skb->data,
				 priv->rx_buf_len, DMA_FROM_DEVICE);
	ret = dma_mapping_error(kdev, mapping);
	if (ret) {
		bcmgenet_free_cb(cb);
		netif_err(priv, rx_err, priv->dev,
			  "%s DMA map failed\n", __func__);
		return ret;
	}

	dma_unmap_addr_set(cb, dma_addr, mapping);
	/* assign packet, prepare descriptor, and advance pointer */

	dmadesc_set_addr(priv, priv->rx_bd_assign_ptr, mapping);

	/* turn on the newly assigned BD for DMA to use */
	priv->rx_bd_assign_index++;
	priv->rx_bd_assign_index &= (priv->num_rx_bds - 1);

	priv->rx_bd_assign_ptr = priv->rx_bds +
		(priv->rx_bd_assign_index * DMA_DESC_SIZE);

	return 0;
}

/* bcmgenet_desc_rx - descriptor based rx process.
 * this could be called from bottom half, or from NAPI polling method.
 */
static unsigned int bcmgenet_desc_rx(struct bcmgenet_priv *priv,
				     unsigned int budget)
{
	struct net_device *dev = priv->dev;
	struct enet_cb *cb;
	struct sk_buff *skb;
	u32 dma_length_status;
	unsigned long dma_flag;
	int len, err;
	unsigned int rxpktprocessed = 0, rxpkttoprocess;
	unsigned int p_index;
	unsigned int chksum_ok = 0;

	p_index = bcmgenet_rdma_ring_readl(priv, DESC_INDEX, RDMA_PROD_INDEX);
	p_index &= DMA_P_INDEX_MASK;

	if (p_index < priv->rx_c_index)
		rxpkttoprocess = (DMA_C_INDEX_MASK + 1) -
			priv->rx_c_index + p_index;
	else
		rxpkttoprocess = p_index - priv->rx_c_index;

	netif_dbg(priv, rx_status, dev,
		  "RDMA: rxpkttoprocess=%d\n", rxpkttoprocess);

	while ((rxpktprocessed < rxpkttoprocess) &&
	       (rxpktprocessed < budget)) {
		cb = &priv->rx_cbs[priv->rx_read_ptr];
		skb = cb->skb;

		/* We do not have a backing SKB, so we do not have a
		 * corresponding DMA mapping for this incoming packet since
		 * bcmgenet_rx_refill always either has both skb and mapping or
		 * none.
		 */
		if (unlikely(!skb)) {
			dev->stats.rx_dropped++;
			dev->stats.rx_errors++;
			goto refill;
		}

		/* Unmap the packet contents such that we can use the
		 * RSV from the 64 bytes descriptor when enabled and save
		 * a 32-bits register read
		 */
		dma_unmap_single(&dev->dev, dma_unmap_addr(cb, dma_addr),
				 priv->rx_buf_len, DMA_FROM_DEVICE);

		if (!priv->desc_64b_en) {
			dma_length_status =
				dmadesc_get_length_status(priv,
							  priv->rx_bds +
							  (priv->rx_read_ptr *
							   DMA_DESC_SIZE));
		} else {
			struct status_64 *status;

			status = (struct status_64 *)skb->data;
			dma_length_status = status->length_status;
		}

		/* DMA flags and length are still valid no matter how
		 * we got the Receive Status Vector (64B RSB or register)
		 */
		dma_flag = dma_length_status & 0xffff;
		len = dma_length_status >> DMA_BUFLENGTH_SHIFT;

		netif_dbg(priv, rx_status, dev,
			  "%s:p_ind=%d c_ind=%d read_ptr=%d len_stat=0x%08x\n",
			  __func__, p_index, priv->rx_c_index,
			  priv->rx_read_ptr, dma_length_status);

		if (unlikely(!(dma_flag & DMA_EOP) || !(dma_flag & DMA_SOP))) {
			netif_err(priv, rx_status, dev,
				  "dropping fragmented packet!\n");
			dev->stats.rx_dropped++;
			dev->stats.rx_errors++;
			dev_kfree_skb_any(cb->skb);
			cb->skb = NULL;
			goto refill;
		}
		/* report errors */
		if (unlikely(dma_flag & (DMA_RX_CRC_ERROR |
						DMA_RX_OV |
						DMA_RX_NO |
						DMA_RX_LG |
						DMA_RX_RXER))) {
			netif_err(priv, rx_status, dev, "dma_flag=0x%x\n",
				  (unsigned int)dma_flag);
			if (dma_flag & DMA_RX_CRC_ERROR)
				dev->stats.rx_crc_errors++;
			if (dma_flag & DMA_RX_OV)
				dev->stats.rx_over_errors++;
			if (dma_flag & DMA_RX_NO)
				dev->stats.rx_frame_errors++;
			if (dma_flag & DMA_RX_LG)
				dev->stats.rx_length_errors++;
			dev->stats.rx_dropped++;
			dev->stats.rx_errors++;

			/* discard the packet and advance consumer index.*/
			dev_kfree_skb_any(cb->skb);
			cb->skb = NULL;
			goto refill;
		} /* error packet */

		chksum_ok = (dma_flag & priv->dma_rx_chk_bit) &&
			     priv->desc_rxchk_en;

		skb_put(skb, len);
		if (priv->desc_64b_en) {
			skb_pull(skb, 64);
			len -= 64;
		}

		if (likely(chksum_ok))
			skb->ip_summed = CHECKSUM_UNNECESSARY;

		/* remove hardware 2bytes added for IP alignment */
		skb_pull(skb, 2);
		len -= 2;

		if (priv->crc_fwd_en) {
			skb_trim(skb, len - ETH_FCS_LEN);
			len -= ETH_FCS_LEN;
		}

		/*Finish setting up the received SKB and send it to the kernel*/
		skb->protocol = eth_type_trans(skb, priv->dev);
		dev->stats.rx_packets++;
		dev->stats.rx_bytes += len;
		if (dma_flag & DMA_RX_MULT)
			dev->stats.multicast++;

		/* Notify kernel */
		napi_gro_receive(&priv->napi, skb);
		cb->skb = NULL;
		netif_dbg(priv, rx_status, dev, "pushed up to kernel\n");

		/* refill RX path on the current control block */
refill:
		err = bcmgenet_rx_refill(priv, cb);
		if (err)
			netif_err(priv, rx_err, dev, "Rx refill failed\n");

		rxpktprocessed++;
		priv->rx_read_ptr++;
		priv->rx_read_ptr &= (priv->num_rx_bds - 1);
	}

	return rxpktprocessed;
}

/* Assign skb to RX DMA descriptor. */
static int bcmgenet_alloc_rx_buffers(struct bcmgenet_priv *priv)
{
	struct enet_cb *cb;
	int ret = 0;
	int i;

	netif_dbg(priv, hw, priv->dev, "%s:\n", __func__);

	/* loop here for each buffer needing assign */
	for (i = 0; i < priv->num_rx_bds; i++) {
		cb = &priv->rx_cbs[priv->rx_bd_assign_index];
		if (cb->skb)
			continue;

		ret = bcmgenet_rx_refill(priv, cb);
		if (ret)
			break;
	}

	return ret;
}

static void bcmgenet_free_rx_buffers(struct bcmgenet_priv *priv)
{
	struct enet_cb *cb;
	int i;

	for (i = 0; i < priv->num_rx_bds; i++) {
		cb = &priv->rx_cbs[i];

		if (dma_unmap_addr(cb, dma_addr)) {
			dma_unmap_single(&priv->dev->dev,
					 dma_unmap_addr(cb, dma_addr),
					 priv->rx_buf_len, DMA_FROM_DEVICE);
			dma_unmap_addr_set(cb, dma_addr, 0);
		}

		if (cb->skb)
			bcmgenet_free_cb(cb);
	}
}

static void umac_enable_set(struct bcmgenet_priv *priv, u32 mask, bool enable)
{
	u32 reg;

	reg = bcmgenet_umac_readl(priv, UMAC_CMD);
	if (enable)
		reg |= mask;
	else
		reg &= ~mask;
	bcmgenet_umac_writel(priv, reg, UMAC_CMD);

	/* UniMAC stops on a packet boundary, wait for a full-size packet
	 * to be processed
	 */
	if (enable == 0)
		usleep_range(1000, 2000);
}

static int reset_umac(struct bcmgenet_priv *priv)
{
	struct device *kdev = &priv->pdev->dev;
	unsigned int timeout = 0;
	u32 reg;

	/* 7358a0/7552a0: bad default in RBUF_FLUSH_CTRL.umac_sw_rst */
	bcmgenet_rbuf_ctrl_set(priv, 0);
	udelay(10);

	/* disable MAC while updating its registers */
	bcmgenet_umac_writel(priv, 0, UMAC_CMD);

	/* issue soft reset, wait for it to complete */
	bcmgenet_umac_writel(priv, CMD_SW_RESET, UMAC_CMD);
	while (timeout++ < 1000) {
		reg = bcmgenet_umac_readl(priv, UMAC_CMD);
		if (!(reg & CMD_SW_RESET))
			return 0;

		udelay(1);
	}

	if (timeout == 1000) {
		dev_err(kdev,
			"timeout waiting for MAC to come out of reset\n");
		return -ETIMEDOUT;
	}

	return 0;
}

static void bcmgenet_intr_disable(struct bcmgenet_priv *priv)
{
	/* Mask all interrupts.*/
	bcmgenet_intrl2_0_writel(priv, 0xFFFFFFFF, INTRL2_CPU_MASK_SET);
	bcmgenet_intrl2_0_writel(priv, 0xFFFFFFFF, INTRL2_CPU_CLEAR);
	bcmgenet_intrl2_0_writel(priv, 0, INTRL2_CPU_MASK_CLEAR);
	bcmgenet_intrl2_1_writel(priv, 0xFFFFFFFF, INTRL2_CPU_MASK_SET);
	bcmgenet_intrl2_1_writel(priv, 0xFFFFFFFF, INTRL2_CPU_CLEAR);
	bcmgenet_intrl2_1_writel(priv, 0, INTRL2_CPU_MASK_CLEAR);
}

static int init_umac(struct bcmgenet_priv *priv)
{
	struct device *kdev = &priv->pdev->dev;
	int ret;
	u32 reg, cpu_mask_clear;

	dev_dbg(&priv->pdev->dev, "bcmgenet: init_umac\n");

	ret = reset_umac(priv);
	if (ret)
		return ret;

	bcmgenet_umac_writel(priv, 0, UMAC_CMD);
	/* clear tx/rx counter */
	bcmgenet_umac_writel(priv,
			     MIB_RESET_RX | MIB_RESET_TX | MIB_RESET_RUNT,
			     UMAC_MIB_CTRL);
	bcmgenet_umac_writel(priv, 0, UMAC_MIB_CTRL);

	bcmgenet_umac_writel(priv, ENET_MAX_MTU_SIZE, UMAC_MAX_FRAME_LEN);

	/* init rx registers, enable ip header optimization */
	reg = bcmgenet_rbuf_readl(priv, RBUF_CTRL);
	reg |= RBUF_ALIGN_2B;
	bcmgenet_rbuf_writel(priv, reg, RBUF_CTRL);

	if (!GENET_IS_V1(priv) && !GENET_IS_V2(priv))
		bcmgenet_rbuf_writel(priv, 1, RBUF_TBUF_SIZE_CTRL);

	bcmgenet_intr_disable(priv);

	cpu_mask_clear = UMAC_IRQ_RXDMA_BDONE;

	dev_dbg(kdev, "%s:Enabling RXDMA_BDONE interrupt\n", __func__);

	/* Monitor cable plug/unplugged event for internal PHY */
	if (phy_is_internal(priv->phydev)) {
		cpu_mask_clear |= (UMAC_IRQ_LINK_DOWN | UMAC_IRQ_LINK_UP);
	} else if (priv->ext_phy) {
		cpu_mask_clear |= (UMAC_IRQ_LINK_DOWN | UMAC_IRQ_LINK_UP);
	} else if (priv->phy_interface == PHY_INTERFACE_MODE_MOCA) {
		reg = bcmgenet_bp_mc_get(priv);
		reg |= BIT(priv->hw_params->bp_in_en_shift);

		/* bp_mask: back pressure mask */
		if (netif_is_multiqueue(priv->dev))
			reg |= priv->hw_params->bp_in_mask;
		else
			reg &= ~priv->hw_params->bp_in_mask;
		bcmgenet_bp_mc_set(priv, reg);
	}

	/* Enable MDIO interrupts on GENET v3+ */
	if (priv->hw_params->flags & GENET_HAS_MDIO_INTR)
		cpu_mask_clear |= UMAC_IRQ_MDIO_DONE | UMAC_IRQ_MDIO_ERROR;

	bcmgenet_intrl2_0_writel(priv, cpu_mask_clear, INTRL2_CPU_MASK_CLEAR);

	/* Enable rx/tx engine.*/
	dev_dbg(kdev, "done init umac\n");

	return 0;
}

/* Initialize all house-keeping variables for a TX ring, along
 * with corresponding hardware registers
 */
static void bcmgenet_init_tx_ring(struct bcmgenet_priv *priv,
				  unsigned int index, unsigned int size,
				  unsigned int write_ptr, unsigned int end_ptr)
{
	struct bcmgenet_tx_ring *ring = &priv->tx_rings[index];
	u32 words_per_bd = WORDS_PER_BD(priv);
	u32 flow_period_val = 0;
	unsigned int first_bd;

	spin_lock_init(&ring->lock);
	ring->index = index;
	if (index == DESC_INDEX) {
		ring->queue = 0;
		ring->int_enable = bcmgenet_tx_ring16_int_enable;
		ring->int_disable = bcmgenet_tx_ring16_int_disable;
	} else {
		ring->queue = index + 1;
		ring->int_enable = bcmgenet_tx_ring_int_enable;
		ring->int_disable = bcmgenet_tx_ring_int_disable;
	}
	ring->cbs = priv->tx_cbs + write_ptr;
	ring->size = size;
	ring->c_index = 0;
	ring->free_bds = size;
	ring->write_ptr = write_ptr;
	ring->cb_ptr = write_ptr;
	ring->end_ptr = end_ptr - 1;
	ring->prod_index = 0;

	/* Set flow period for ring != 16 */
	if (index != DESC_INDEX)
		flow_period_val = ENET_MAX_MTU_SIZE << 16;

	bcmgenet_tdma_ring_writel(priv, index, 0, TDMA_PROD_INDEX);
	bcmgenet_tdma_ring_writel(priv, index, 0, TDMA_CONS_INDEX);
	bcmgenet_tdma_ring_writel(priv, index, 1, DMA_MBUF_DONE_THRESH);
	/* Disable rate control for now */
	bcmgenet_tdma_ring_writel(priv, index, flow_period_val,
				  TDMA_FLOW_PERIOD);
	/* Unclassified traffic goes to ring 16 */
	bcmgenet_tdma_ring_writel(priv, index,
				  ((size << DMA_RING_SIZE_SHIFT) |
				   RX_BUF_LENGTH), DMA_RING_BUF_SIZE);

	first_bd = write_ptr;

	/* Set start and end address, read and write pointers */
	bcmgenet_tdma_ring_writel(priv, index, first_bd * words_per_bd,
				  DMA_START_ADDR);
	bcmgenet_tdma_ring_writel(priv, index, first_bd * words_per_bd,
				  TDMA_READ_PTR);
	bcmgenet_tdma_ring_writel(priv, index, first_bd,
				  TDMA_WRITE_PTR);
	bcmgenet_tdma_ring_writel(priv, index, end_ptr * words_per_bd - 1,
				  DMA_END_ADDR);
}

/* Initialize a RDMA ring */
static int bcmgenet_init_rx_ring(struct bcmgenet_priv *priv,
				 unsigned int index, unsigned int size)
{
	u32 words_per_bd = WORDS_PER_BD(priv);
	int ret;

	priv->num_rx_bds = TOTAL_DESC;
	priv->rx_bds = priv->base + priv->hw_params->rdma_offset;
	priv->rx_bd_assign_ptr = priv->rx_bds;
	priv->rx_bd_assign_index = 0;
	priv->rx_c_index = 0;
	priv->rx_read_ptr = 0;
	priv->rx_cbs = kcalloc(priv->num_rx_bds, sizeof(struct enet_cb),
			       GFP_KERNEL);
	if (!priv->rx_cbs)
		return -ENOMEM;

	ret = bcmgenet_alloc_rx_buffers(priv);
	if (ret) {
		kfree(priv->rx_cbs);
		return ret;
	}

	bcmgenet_rdma_ring_writel(priv, index, 0, RDMA_WRITE_PTR);
	bcmgenet_rdma_ring_writel(priv, index, 0, RDMA_PROD_INDEX);
	bcmgenet_rdma_ring_writel(priv, index, 0, RDMA_CONS_INDEX);
	bcmgenet_rdma_ring_writel(priv, index,
				  ((size << DMA_RING_SIZE_SHIFT) |
				   RX_BUF_LENGTH), DMA_RING_BUF_SIZE);
	bcmgenet_rdma_ring_writel(priv, index, 0, DMA_START_ADDR);
	bcmgenet_rdma_ring_writel(priv, index,
				  words_per_bd * size - 1, DMA_END_ADDR);
	bcmgenet_rdma_ring_writel(priv, index,
				  (DMA_FC_THRESH_LO <<
				   DMA_XOFF_THRESHOLD_SHIFT) |
				   DMA_FC_THRESH_HI, RDMA_XON_XOFF_THRESH);
	bcmgenet_rdma_ring_writel(priv, index, 0, RDMA_READ_PTR);

	return ret;
}

/* init multi xmit queues, only available for GENET2+
 * the queue is partitioned as follows:
 *
 * queue 0 - 3 is priority based, each one has 32 descriptors,
 * with queue 0 being the highest priority queue.
 *
 * queue 16 is the default tx queue with GENET_DEFAULT_BD_CNT
 * descriptors: 256 - (number of tx queues * bds per queues) = 128
 * descriptors.
 *
 * The transmit control block pool is then partitioned as following:
 * - tx_cbs[0...127] are for queue 16
 * - tx_ring_cbs[0] points to tx_cbs[128..159]
 * - tx_ring_cbs[1] points to tx_cbs[160..191]
 * - tx_ring_cbs[2] points to tx_cbs[192..223]
 * - tx_ring_cbs[3] points to tx_cbs[224..255]
 */
static void bcmgenet_init_multiq(struct net_device *dev)
{
	struct bcmgenet_priv *priv = netdev_priv(dev);
	unsigned int i, dma_enable;
	u32 reg, dma_ctrl, ring_cfg = 0;
	u32 dma_priority[3] = {0, 0, 0};

	if (!netif_is_multiqueue(dev)) {
		netdev_warn(dev, "called with non multi queue aware HW\n");
		return;
	}

	dma_ctrl = bcmgenet_tdma_readl(priv, DMA_CTRL);
	dma_enable = dma_ctrl & DMA_EN;
	dma_ctrl &= ~DMA_EN;
	bcmgenet_tdma_writel(priv, dma_ctrl, DMA_CTRL);

	/* Enable strict priority arbiter mode */
	bcmgenet_tdma_writel(priv, DMA_ARBITER_SP, DMA_ARB_CTRL);

	for (i = 0; i < priv->hw_params->tx_queues; i++) {
		/* first 64 tx_cbs are reserved for default tx queue
		 * (ring 16)
		 */
		bcmgenet_init_tx_ring(priv, i, priv->hw_params->bds_cnt,
				      i * priv->hw_params->bds_cnt,
				      (i + 1) * priv->hw_params->bds_cnt);

		/* Configure ring as descriptor ring and setup priority */
		ring_cfg |= 1 << i;
		dma_ctrl |= 1 << (i + DMA_RING_BUF_EN_SHIFT);

		dma_priority[DMA_PRIO_REG_INDEX(i)] |=
			((GENET_Q0_PRIORITY + i) << DMA_PRIO_REG_SHIFT(i));
	}

	/* Set ring 16 priority and program the hardware registers */
	dma_priority[DMA_PRIO_REG_INDEX(DESC_INDEX)] |=
		((GENET_Q0_PRIORITY + priv->hw_params->tx_queues) <<
		 DMA_PRIO_REG_SHIFT(DESC_INDEX));
	bcmgenet_tdma_writel(priv, dma_priority[0], DMA_PRIORITY_0);
	bcmgenet_tdma_writel(priv, dma_priority[1], DMA_PRIORITY_1);
	bcmgenet_tdma_writel(priv, dma_priority[2], DMA_PRIORITY_2);

	/* Enable rings */
	reg = bcmgenet_tdma_readl(priv, DMA_RING_CFG);
	reg |= ring_cfg;
	bcmgenet_tdma_writel(priv, reg, DMA_RING_CFG);

	/* Configure ring as descriptor ring and re-enable DMA if enabled */
	reg = bcmgenet_tdma_readl(priv, DMA_CTRL);
	reg |= dma_ctrl;
	if (dma_enable)
		reg |= DMA_EN;
	bcmgenet_tdma_writel(priv, reg, DMA_CTRL);
}

static int bcmgenet_dma_teardown(struct bcmgenet_priv *priv)
{
	int ret = 0;
	int timeout = 0;
	u32 reg;

	/* Disable TDMA to stop add more frames in TX DMA */
	reg = bcmgenet_tdma_readl(priv, DMA_CTRL);
	reg &= ~DMA_EN;
	bcmgenet_tdma_writel(priv, reg, DMA_CTRL);

	/* Check TDMA status register to confirm TDMA is disabled */
	while (timeout++ < DMA_TIMEOUT_VAL) {
		reg = bcmgenet_tdma_readl(priv, DMA_STATUS);
		if (reg & DMA_DISABLED)
			break;

		udelay(1);
	}

	if (timeout == DMA_TIMEOUT_VAL) {
		netdev_warn(priv->dev, "Timed out while disabling TX DMA\n");
		ret = -ETIMEDOUT;
	}

	/* Wait 10ms for packet drain in both tx and rx dma */
	usleep_range(10000, 20000);

	/* Disable RDMA */
	reg = bcmgenet_rdma_readl(priv, DMA_CTRL);
	reg &= ~DMA_EN;
	bcmgenet_rdma_writel(priv, reg, DMA_CTRL);

	timeout = 0;
	/* Check RDMA status register to confirm RDMA is disabled */
	while (timeout++ < DMA_TIMEOUT_VAL) {
		reg = bcmgenet_rdma_readl(priv, DMA_STATUS);
		if (reg & DMA_DISABLED)
			break;

		udelay(1);
	}

	if (timeout == DMA_TIMEOUT_VAL) {
		netdev_warn(priv->dev, "Timed out while disabling RX DMA\n");
		ret = -ETIMEDOUT;
	}

	return ret;
}

static void bcmgenet_fini_dma(struct bcmgenet_priv *priv)
{
	int i;

	/* disable DMA */
	bcmgenet_dma_teardown(priv);

	for (i = 0; i < priv->num_tx_bds; i++) {
		if (priv->tx_cbs[i].skb != NULL) {
			dev_kfree_skb(priv->tx_cbs[i].skb);
			priv->tx_cbs[i].skb = NULL;
		}
	}

	bcmgenet_free_rx_buffers(priv);
	kfree(priv->rx_cbs);
	kfree(priv->tx_cbs);
}

/* init_edma: Initialize DMA control register */
static int bcmgenet_init_dma(struct bcmgenet_priv *priv)
{
	int ret;

	netif_dbg(priv, hw, priv->dev, "bcmgenet: init_edma\n");

	/* by default, enable ring 16 (descriptor based) */
	ret = bcmgenet_init_rx_ring(priv, DESC_INDEX, TOTAL_DESC);
	if (ret) {
		netdev_err(priv->dev, "failed to initialize RX ring\n");
		return ret;
	}

	/* init rDma */
	bcmgenet_rdma_writel(priv, DMA_MAX_BURST_LENGTH, DMA_SCB_BURST_SIZE);

	/* Init tDma */
	bcmgenet_tdma_writel(priv, DMA_MAX_BURST_LENGTH, DMA_SCB_BURST_SIZE);

	/* Initialize common TX ring structures */
	priv->tx_bds = priv->base + priv->hw_params->tdma_offset;
	priv->num_tx_bds = TOTAL_DESC;
	priv->tx_cbs = kcalloc(priv->num_tx_bds, sizeof(struct enet_cb),
			       GFP_KERNEL);
	if (!priv->tx_cbs) {
		bcmgenet_fini_dma(priv);
		return -ENOMEM;
	}

	/* initialize multi xmit queue */
	bcmgenet_init_multiq(priv->dev);

	/* initialize special ring 16 */
	bcmgenet_init_tx_ring(priv, DESC_INDEX, GENET_DEFAULT_BD_CNT,
			      priv->hw_params->tx_queues *
			      priv->hw_params->bds_cnt,
			      TOTAL_DESC);

	return 0;
}

/* NAPI polling method*/
static int bcmgenet_poll(struct napi_struct *napi, int budget)
{
	struct bcmgenet_priv *priv = container_of(napi,
			struct bcmgenet_priv, napi);
	unsigned int work_done;

	/* tx reclaim */
	bcmgenet_tx_reclaim(priv->dev, &priv->tx_rings[DESC_INDEX]);

	work_done = bcmgenet_desc_rx(priv, budget);

	/* Advancing our consumer index*/
	priv->rx_c_index += work_done;
	priv->rx_c_index &= DMA_C_INDEX_MASK;
	bcmgenet_rdma_ring_writel(priv, DESC_INDEX,
				  priv->rx_c_index, RDMA_CONS_INDEX);
	if (work_done < budget) {
		napi_complete(napi);
		bcmgenet_intrl2_0_writel(priv, UMAC_IRQ_RXDMA_BDONE,
					 INTRL2_CPU_MASK_CLEAR);
	}

	return work_done;
}

/* Interrupt bottom half */
static void bcmgenet_irq_task(struct work_struct *work)
{
	struct bcmgenet_priv *priv = container_of(
			work, struct bcmgenet_priv, bcmgenet_irq_work);

	netif_dbg(priv, intr, priv->dev, "%s\n", __func__);

	if (priv->irq0_stat & UMAC_IRQ_MPD_R) {
		priv->irq0_stat &= ~UMAC_IRQ_MPD_R;
		netif_dbg(priv, wol, priv->dev,
			  "magic packet detected, waking up\n");
		bcmgenet_power_up(priv, GENET_POWER_WOL_MAGIC);
	}

	/* Link UP/DOWN event */
	if ((priv->hw_params->flags & GENET_HAS_MDIO_INTR) &&
	    (priv->irq0_stat & (UMAC_IRQ_LINK_UP|UMAC_IRQ_LINK_DOWN))) {
		phy_mac_interrupt(priv->phydev,
				  priv->irq0_stat & UMAC_IRQ_LINK_UP);
		priv->irq0_stat &= ~(UMAC_IRQ_LINK_UP|UMAC_IRQ_LINK_DOWN);
	}
}

/* bcmgenet_isr1: interrupt handler for ring buffer. */
static irqreturn_t bcmgenet_isr1(int irq, void *dev_id)
{
	struct bcmgenet_priv *priv = dev_id;
	unsigned int index;

	/* Save irq status for bottom-half processing. */
	priv->irq1_stat =
		bcmgenet_intrl2_1_readl(priv, INTRL2_CPU_STAT) &
		~priv->int1_mask;
	/* clear interrupts */
	bcmgenet_intrl2_1_writel(priv, priv->irq1_stat, INTRL2_CPU_CLEAR);

	netif_dbg(priv, intr, priv->dev,
		  "%s: IRQ=0x%x\n", __func__, priv->irq1_stat);
	/* Check the MBDONE interrupts.
	 * packet is done, reclaim descriptors
	 */
	if (priv->irq1_stat & 0x0000ffff) {
		index = 0;
		for (index = 0; index < 16; index++) {
			if (priv->irq1_stat & (1 << index))
				bcmgenet_tx_reclaim(priv->dev,
						    &priv->tx_rings[index]);
		}
	}
	return IRQ_HANDLED;
}

/* bcmgenet_isr0: Handle various interrupts. */
static irqreturn_t bcmgenet_isr0(int irq, void *dev_id)
{
	struct bcmgenet_priv *priv = dev_id;

	/* Save irq status for bottom-half processing. */
	priv->irq0_stat =
		bcmgenet_intrl2_0_readl(priv, INTRL2_CPU_STAT) &
		~bcmgenet_intrl2_0_readl(priv, INTRL2_CPU_MASK_STATUS);
	/* clear interrupts */
	bcmgenet_intrl2_0_writel(priv, priv->irq0_stat, INTRL2_CPU_CLEAR);

	netif_dbg(priv, intr, priv->dev,
		  "IRQ=0x%x\n", priv->irq0_stat);

	if (priv->irq0_stat & (UMAC_IRQ_RXDMA_BDONE | UMAC_IRQ_RXDMA_PDONE)) {
		/* We use NAPI(software interrupt throttling, if
		 * Rx Descriptor throttling is not used.
		 * Disable interrupt, will be enabled in the poll method.
		 */
		if (likely(napi_schedule_prep(&priv->napi))) {
			bcmgenet_intrl2_0_writel(priv, UMAC_IRQ_RXDMA_BDONE,
						 INTRL2_CPU_MASK_SET);
			__napi_schedule(&priv->napi);
		}
	}
	if (priv->irq0_stat &
			(UMAC_IRQ_TXDMA_BDONE | UMAC_IRQ_TXDMA_PDONE)) {
		/* Tx reclaim */
		bcmgenet_tx_reclaim(priv->dev, &priv->tx_rings[DESC_INDEX]);
	}
	if (priv->irq0_stat & (UMAC_IRQ_PHY_DET_R |
				UMAC_IRQ_PHY_DET_F |
				UMAC_IRQ_LINK_UP |
				UMAC_IRQ_LINK_DOWN |
				UMAC_IRQ_HFB_SM |
				UMAC_IRQ_HFB_MM |
				UMAC_IRQ_MPD_R)) {
		/* all other interested interrupts handled in bottom half */
		schedule_work(&priv->bcmgenet_irq_work);
	}

	if ((priv->hw_params->flags & GENET_HAS_MDIO_INTR) &&
	    priv->irq0_stat & (UMAC_IRQ_MDIO_DONE | UMAC_IRQ_MDIO_ERROR)) {
		priv->irq0_stat &= ~(UMAC_IRQ_MDIO_DONE | UMAC_IRQ_MDIO_ERROR);
		wake_up(&priv->wq);
	}

	return IRQ_HANDLED;
}

static irqreturn_t bcmgenet_wol_isr(int irq, void *dev_id)
{
	struct bcmgenet_priv *priv = dev_id;

	pm_wakeup_event(&priv->pdev->dev, 0);

	return IRQ_HANDLED;
}

static void bcmgenet_umac_reset(struct bcmgenet_priv *priv)
{
	u32 reg;

	reg = bcmgenet_rbuf_ctrl_get(priv);
	reg |= BIT(1);
	bcmgenet_rbuf_ctrl_set(priv, reg);
	udelay(10);

	reg &= ~BIT(1);
	bcmgenet_rbuf_ctrl_set(priv, reg);
	udelay(10);
}

static void bcmgenet_set_hw_addr(struct bcmgenet_priv *priv,
				 unsigned char *addr)
{
	bcmgenet_umac_writel(priv, (addr[0] << 24) | (addr[1] << 16) |
			(addr[2] << 8) | addr[3], UMAC_MAC0);
	bcmgenet_umac_writel(priv, (addr[4] << 8) | addr[5], UMAC_MAC1);
}

/* Returns a reusable dma control register value */
static u32 bcmgenet_dma_disable(struct bcmgenet_priv *priv)
{
	u32 reg;
	u32 dma_ctrl;

	/* disable DMA */
	dma_ctrl = 1 << (DESC_INDEX + DMA_RING_BUF_EN_SHIFT) | DMA_EN;
	reg = bcmgenet_tdma_readl(priv, DMA_CTRL);
	reg &= ~dma_ctrl;
	bcmgenet_tdma_writel(priv, reg, DMA_CTRL);

	reg = bcmgenet_rdma_readl(priv, DMA_CTRL);
	reg &= ~dma_ctrl;
	bcmgenet_rdma_writel(priv, reg, DMA_CTRL);

	bcmgenet_umac_writel(priv, 1, UMAC_TX_FLUSH);
	udelay(10);
	bcmgenet_umac_writel(priv, 0, UMAC_TX_FLUSH);

	return dma_ctrl;
}

static void bcmgenet_enable_dma(struct bcmgenet_priv *priv, u32 dma_ctrl)
{
	u32 reg;

	reg = bcmgenet_rdma_readl(priv, DMA_CTRL);
	reg |= dma_ctrl;
	bcmgenet_rdma_writel(priv, reg, DMA_CTRL);

	reg = bcmgenet_tdma_readl(priv, DMA_CTRL);
	reg |= dma_ctrl;
	bcmgenet_tdma_writel(priv, reg, DMA_CTRL);
}

static void bcmgenet_netif_start(struct net_device *dev)
{
	struct bcmgenet_priv *priv = netdev_priv(dev);

	/* Start the network engine */
	napi_enable(&priv->napi);

	umac_enable_set(priv, CMD_TX_EN | CMD_RX_EN, true);

	if (phy_is_internal(priv->phydev))
		bcmgenet_power_up(priv, GENET_POWER_PASSIVE);

	netif_tx_start_all_queues(dev);

	phy_start(priv->phydev);
}

static int bcmgenet_open(struct net_device *dev)
{
	struct bcmgenet_priv *priv = netdev_priv(dev);
	unsigned long dma_ctrl;
	u32 reg;
	int ret;

	netif_dbg(priv, ifup, dev, "bcmgenet_open\n");

	/* Turn on the clock */
	if (!IS_ERR(priv->clk))
		clk_prepare_enable(priv->clk);

	/* take MAC out of reset */
	bcmgenet_umac_reset(priv);

	ret = init_umac(priv);
	if (ret)
		goto err_clk_disable;

	/* disable ethernet MAC while updating its registers */
	umac_enable_set(priv, CMD_TX_EN | CMD_RX_EN, false);

	/* Make sure we reflect the value of CRC_CMD_FWD */
	reg = bcmgenet_umac_readl(priv, UMAC_CMD);
	priv->crc_fwd_en = !!(reg & CMD_CRC_FWD);

	bcmgenet_set_hw_addr(priv, dev->dev_addr);

	if (phy_is_internal(priv->phydev)) {
		reg = bcmgenet_ext_readl(priv, EXT_EXT_PWR_MGMT);
		reg |= EXT_ENERGY_DET_MASK;
		bcmgenet_ext_writel(priv, reg, EXT_EXT_PWR_MGMT);
	}

	/* Disable RX/TX DMA and flush TX queues */
	dma_ctrl = bcmgenet_dma_disable(priv);

	/* Reinitialize TDMA and RDMA and SW housekeeping */
	ret = bcmgenet_init_dma(priv);
	if (ret) {
		netdev_err(dev, "failed to initialize DMA\n");
		goto err_fini_dma;
	}

	/* Always enable ring 16 - descriptor ring */
	bcmgenet_enable_dma(priv, dma_ctrl);

	ret = request_irq(priv->irq0, bcmgenet_isr0, IRQF_SHARED,
			  dev->name, priv);
	if (ret < 0) {
		netdev_err(dev, "can't request IRQ %d\n", priv->irq0);
		goto err_fini_dma;
	}

	ret = request_irq(priv->irq1, bcmgenet_isr1, IRQF_SHARED,
			  dev->name, priv);
	if (ret < 0) {
		netdev_err(dev, "can't request IRQ %d\n", priv->irq1);
		goto err_irq0;
	}

	/* Re-configure the port multiplexer towards the PHY device */
	bcmgenet_mii_config(priv->dev, false);

	phy_connect_direct(dev, priv->phydev, bcmgenet_mii_setup,
			   priv->phy_interface);

	bcmgenet_netif_start(dev);

	return 0;

err_irq0:
	free_irq(priv->irq0, dev);
err_fini_dma:
	bcmgenet_fini_dma(priv);
err_clk_disable:
	if (!IS_ERR(priv->clk))
		clk_disable_unprepare(priv->clk);
	return ret;
}

static void bcmgenet_netif_stop(struct net_device *dev)
{
	struct bcmgenet_priv *priv = netdev_priv(dev);

	netif_tx_stop_all_queues(dev);
	napi_disable(&priv->napi);
	phy_stop(priv->phydev);

	bcmgenet_intr_disable(priv);

	/* Wait for pending work items to complete. Since interrupts are
	 * disabled no new work will be scheduled.
	 */
	cancel_work_sync(&priv->bcmgenet_irq_work);

	priv->old_link = -1;
	priv->old_speed = -1;
	priv->old_duplex = -1;
	priv->old_pause = -1;
}

static int bcmgenet_close(struct net_device *dev)
{
	struct bcmgenet_priv *priv = netdev_priv(dev);
	int ret;

	netif_dbg(priv, ifdown, dev, "bcmgenet_close\n");

	bcmgenet_netif_stop(dev);

	/* Really kill the PHY state machine and disconnect from it */
	phy_disconnect(priv->phydev);

	/* Disable MAC receive */
	umac_enable_set(priv, CMD_RX_EN, false);

	ret = bcmgenet_dma_teardown(priv);
	if (ret)
		return ret;

	/* Disable MAC transmit. TX DMA disabled have to done before this */
	umac_enable_set(priv, CMD_TX_EN, false);

	/* tx reclaim */
	bcmgenet_tx_reclaim_all(dev);
	bcmgenet_fini_dma(priv);

	free_irq(priv->irq0, priv);
	free_irq(priv->irq1, priv);

	if (phy_is_internal(priv->phydev))
		bcmgenet_power_down(priv, GENET_POWER_PASSIVE);

	if (!IS_ERR(priv->clk))
		clk_disable_unprepare(priv->clk);

	return 0;
}

static void bcmgenet_timeout(struct net_device *dev)
{
	struct bcmgenet_priv *priv = netdev_priv(dev);

	netif_dbg(priv, tx_err, dev, "bcmgenet_timeout\n");

	dev->trans_start = jiffies;

	dev->stats.tx_errors++;

	netif_tx_wake_all_queues(dev);
}

#define MAX_MC_COUNT	16

static inline void bcmgenet_set_mdf_addr(struct bcmgenet_priv *priv,
					 unsigned char *addr,
					 int *i,
					 int *mc)
{
	u32 reg;

	bcmgenet_umac_writel(priv, addr[0] << 8 | addr[1],
			     UMAC_MDF_ADDR + (*i * 4));
	bcmgenet_umac_writel(priv, addr[2] << 24 | addr[3] << 16 |
			     addr[4] << 8 | addr[5],
			     UMAC_MDF_ADDR + ((*i + 1) * 4));
	reg = bcmgenet_umac_readl(priv, UMAC_MDF_CTRL);
	reg |= (1 << (MAX_MC_COUNT - *mc));
	bcmgenet_umac_writel(priv, reg, UMAC_MDF_CTRL);
	*i += 2;
	(*mc)++;
}

static void bcmgenet_set_rx_mode(struct net_device *dev)
{
	struct bcmgenet_priv *priv = netdev_priv(dev);
	struct netdev_hw_addr *ha;
	int i, mc;
	u32 reg;

	netif_dbg(priv, hw, dev, "%s: %08X\n", __func__, dev->flags);

	/* Promiscuous mode */
	reg = bcmgenet_umac_readl(priv, UMAC_CMD);
	if (dev->flags & IFF_PROMISC) {
		reg |= CMD_PROMISC;
		bcmgenet_umac_writel(priv, reg, UMAC_CMD);
		bcmgenet_umac_writel(priv, 0, UMAC_MDF_CTRL);
		return;
	} else {
		reg &= ~CMD_PROMISC;
		bcmgenet_umac_writel(priv, reg, UMAC_CMD);
	}

	/* UniMac doesn't support ALLMULTI */
	if (dev->flags & IFF_ALLMULTI) {
		netdev_warn(dev, "ALLMULTI is not supported\n");
		return;
	}

	/* update MDF filter */
	i = 0;
	mc = 0;
	/* Broadcast */
	bcmgenet_set_mdf_addr(priv, dev->broadcast, &i, &mc);
	/* my own address.*/
	bcmgenet_set_mdf_addr(priv, dev->dev_addr, &i, &mc);
	/* Unicast list*/
	if (netdev_uc_count(dev) > (MAX_MC_COUNT - mc))
		return;

	if (!netdev_uc_empty(dev))
		netdev_for_each_uc_addr(ha, dev)
			bcmgenet_set_mdf_addr(priv, ha->addr, &i, &mc);
	/* Multicast */
	if (netdev_mc_empty(dev) || netdev_mc_count(dev) >= (MAX_MC_COUNT - mc))
		return;

	netdev_for_each_mc_addr(ha, dev)
		bcmgenet_set_mdf_addr(priv, ha->addr, &i, &mc);
}

/* Set the hardware MAC address. */
static int bcmgenet_set_mac_addr(struct net_device *dev, void *p)
{
	struct sockaddr *addr = p;

	/* Setting the MAC address at the hardware level is not possible
	 * without disabling the UniMAC RX/TX enable bits.
	 */
	if (netif_running(dev))
		return -EBUSY;

	ether_addr_copy(dev->dev_addr, addr->sa_data);

	return 0;
}

static const struct net_device_ops bcmgenet_netdev_ops = {
	.ndo_open		= bcmgenet_open,
	.ndo_stop		= bcmgenet_close,
	.ndo_start_xmit		= bcmgenet_xmit,
	.ndo_tx_timeout		= bcmgenet_timeout,
	.ndo_set_rx_mode	= bcmgenet_set_rx_mode,
	.ndo_set_mac_address	= bcmgenet_set_mac_addr,
	.ndo_do_ioctl		= bcmgenet_ioctl,
	.ndo_set_features	= bcmgenet_set_features,
};

/* Array of GENET hardware parameters/characteristics */
static struct bcmgenet_hw_params bcmgenet_hw_params[] = {
	[GENET_V1] = {
		.tx_queues = 0,
		.rx_queues = 0,
		.bds_cnt = 0,
		.bp_in_en_shift = 16,
		.bp_in_mask = 0xffff,
		.hfb_filter_cnt = 16,
		.qtag_mask = 0x1F,
		.hfb_offset = 0x1000,
		.rdma_offset = 0x2000,
		.tdma_offset = 0x3000,
		.words_per_bd = 2,
	},
	[GENET_V2] = {
		.tx_queues = 4,
		.rx_queues = 4,
		.bds_cnt = 32,
		.bp_in_en_shift = 16,
		.bp_in_mask = 0xffff,
		.hfb_filter_cnt = 16,
		.qtag_mask = 0x1F,
		.tbuf_offset = 0x0600,
		.hfb_offset = 0x1000,
		.hfb_reg_offset = 0x2000,
		.rdma_offset = 0x3000,
		.tdma_offset = 0x4000,
		.words_per_bd = 2,
		.flags = GENET_HAS_EXT,
	},
	[GENET_V3] = {
		.tx_queues = 4,
		.rx_queues = 4,
		.bds_cnt = 32,
		.bp_in_en_shift = 17,
		.bp_in_mask = 0x1ffff,
		.hfb_filter_cnt = 48,
		.qtag_mask = 0x3F,
		.tbuf_offset = 0x0600,
		.hfb_offset = 0x8000,
		.hfb_reg_offset = 0xfc00,
		.rdma_offset = 0x10000,
		.tdma_offset = 0x11000,
		.words_per_bd = 2,
		.flags = GENET_HAS_EXT | GENET_HAS_MDIO_INTR,
	},
	[GENET_V4] = {
		.tx_queues = 4,
		.rx_queues = 4,
		.bds_cnt = 32,
		.bp_in_en_shift = 17,
		.bp_in_mask = 0x1ffff,
		.hfb_filter_cnt = 48,
		.qtag_mask = 0x3F,
		.tbuf_offset = 0x0600,
		.hfb_offset = 0x8000,
		.hfb_reg_offset = 0xfc00,
		.rdma_offset = 0x2000,
		.tdma_offset = 0x4000,
		.words_per_bd = 3,
		.flags = GENET_HAS_40BITS | GENET_HAS_EXT | GENET_HAS_MDIO_INTR,
	},
};

/* Infer hardware parameters from the detected GENET version */
static void bcmgenet_set_hw_params(struct bcmgenet_priv *priv)
{
	struct bcmgenet_hw_params *params;
	u32 reg;
	u8 major;

	if (GENET_IS_V4(priv)) {
		bcmgenet_dma_regs = bcmgenet_dma_regs_v3plus;
		genet_dma_ring_regs = genet_dma_ring_regs_v4;
		priv->dma_rx_chk_bit = DMA_RX_CHK_V3PLUS;
		priv->version = GENET_V4;
	} else if (GENET_IS_V3(priv)) {
		bcmgenet_dma_regs = bcmgenet_dma_regs_v3plus;
		genet_dma_ring_regs = genet_dma_ring_regs_v123;
		priv->dma_rx_chk_bit = DMA_RX_CHK_V3PLUS;
		priv->version = GENET_V3;
	} else if (GENET_IS_V2(priv)) {
		bcmgenet_dma_regs = bcmgenet_dma_regs_v2;
		genet_dma_ring_regs = genet_dma_ring_regs_v123;
		priv->dma_rx_chk_bit = DMA_RX_CHK_V12;
		priv->version = GENET_V2;
	} else if (GENET_IS_V1(priv)) {
		bcmgenet_dma_regs = bcmgenet_dma_regs_v1;
		genet_dma_ring_regs = genet_dma_ring_regs_v123;
		priv->dma_rx_chk_bit = DMA_RX_CHK_V12;
		priv->version = GENET_V1;
	}

	/* enum genet_version starts at 1 */
	priv->hw_params = &bcmgenet_hw_params[priv->version];
	params = priv->hw_params;

	/* Read GENET HW version */
	reg = bcmgenet_sys_readl(priv, SYS_REV_CTRL);
	major = (reg >> 24 & 0x0f);
	if (major == 5)
		major = 4;
	else if (major == 0)
		major = 1;
	if (major != priv->version) {
		dev_err(&priv->pdev->dev,
			"GENET version mismatch, got: %d, configured for: %d\n",
			major, priv->version);
	}

	/* Print the GENET core version */
	dev_info(&priv->pdev->dev, "GENET " GENET_VER_FMT,
		 major, (reg >> 16) & 0x0f, reg & 0xffff);

	/* Store the integrated PHY revision for the MDIO probing function
	 * to pass this information to the PHY driver. The PHY driver expects
	 * to find the PHY major revision in bits 15:8 while the GENET register
	 * stores that information in bits 7:0, account for that.
	 */
	priv->gphy_rev = (reg & 0xffff) << 8;

#ifdef CONFIG_PHYS_ADDR_T_64BIT
	if (!(params->flags & GENET_HAS_40BITS))
		pr_warn("GENET does not support 40-bits PA\n");
#endif

	pr_debug("Configuration for version: %d\n"
		"TXq: %1d, RXq: %1d, BDs: %1d\n"
		"BP << en: %2d, BP msk: 0x%05x\n"
		"HFB count: %2d, QTAQ msk: 0x%05x\n"
		"TBUF: 0x%04x, HFB: 0x%04x, HFBreg: 0x%04x\n"
		"RDMA: 0x%05x, TDMA: 0x%05x\n"
		"Words/BD: %d\n",
		priv->version,
		params->tx_queues, params->rx_queues, params->bds_cnt,
		params->bp_in_en_shift, params->bp_in_mask,
		params->hfb_filter_cnt, params->qtag_mask,
		params->tbuf_offset, params->hfb_offset,
		params->hfb_reg_offset,
		params->rdma_offset, params->tdma_offset,
		params->words_per_bd);
}

static const struct of_device_id bcmgenet_match[] = {
	{ .compatible = "brcm,genet-v1", .data = (void *)GENET_V1 },
	{ .compatible = "brcm,genet-v2", .data = (void *)GENET_V2 },
	{ .compatible = "brcm,genet-v3", .data = (void *)GENET_V3 },
	{ .compatible = "brcm,genet-v4", .data = (void *)GENET_V4 },
	{ },
};

static int bcmgenet_probe(struct platform_device *pdev)
{
	struct device_node *dn = pdev->dev.of_node;
	const struct of_device_id *of_id;
	struct bcmgenet_priv *priv;
	struct net_device *dev;
	const void *macaddr;
	struct resource *r;
	int err = -EIO;

	/* Up to GENET_MAX_MQ_CNT + 1 TX queues and a single RX queue */
	dev = alloc_etherdev_mqs(sizeof(*priv), GENET_MAX_MQ_CNT + 1, 1);
	if (!dev) {
		dev_err(&pdev->dev, "can't allocate net device\n");
		return -ENOMEM;
	}

	of_id = of_match_node(bcmgenet_match, dn);
	if (!of_id)
		return -EINVAL;

	priv = netdev_priv(dev);
	priv->irq0 = platform_get_irq(pdev, 0);
	priv->irq1 = platform_get_irq(pdev, 1);
	priv->wol_irq = platform_get_irq(pdev, 2);
	if (!priv->irq0 || !priv->irq1) {
		dev_err(&pdev->dev, "can't find IRQs\n");
		err = -EINVAL;
		goto err;
	}

	macaddr = of_get_mac_address(dn);
	if (!macaddr) {
		dev_err(&pdev->dev, "can't find MAC address\n");
		err = -EINVAL;
		goto err;
	}

	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	priv->base = devm_ioremap_resource(&pdev->dev, r);
	if (IS_ERR(priv->base)) {
		err = PTR_ERR(priv->base);
		goto err;
	}

	SET_NETDEV_DEV(dev, &pdev->dev);
	dev_set_drvdata(&pdev->dev, dev);
	ether_addr_copy(dev->dev_addr, macaddr);
	dev->watchdog_timeo = 2 * HZ;
	dev->ethtool_ops = &bcmgenet_ethtool_ops;
	dev->netdev_ops = &bcmgenet_netdev_ops;
	netif_napi_add(dev, &priv->napi, bcmgenet_poll, 64);

	priv->msg_enable = netif_msg_init(-1, GENET_MSG_DEFAULT);

	/* Set hardware features */
	dev->hw_features |= NETIF_F_SG | NETIF_F_IP_CSUM |
		NETIF_F_IPV6_CSUM | NETIF_F_RXCSUM;

	/* Request the WOL interrupt and advertise suspend if available */
	priv->wol_irq_disabled = true;
	err = devm_request_irq(&pdev->dev, priv->wol_irq, bcmgenet_wol_isr, 0,
			       dev->name, priv);
	if (!err)
		device_set_wakeup_capable(&pdev->dev, 1);

	/* Set the needed headroom to account for any possible
	 * features enabling/disabling at runtime
	 */
	dev->needed_headroom += 64;

	netdev_boot_setup_check(dev);

	priv->dev = dev;
	priv->pdev = pdev;
	priv->version = (enum bcmgenet_version)of_id->data;

	priv->clk = devm_clk_get(&priv->pdev->dev, "enet");
	if (IS_ERR(priv->clk))
		dev_warn(&priv->pdev->dev, "failed to get enet clock\n");

	if (!IS_ERR(priv->clk))
		clk_prepare_enable(priv->clk);

	bcmgenet_set_hw_params(priv);

	/* Mii wait queue */
	init_waitqueue_head(&priv->wq);
	/* Always use RX_BUF_LENGTH (2KB) buffer for all chips */
	priv->rx_buf_len = RX_BUF_LENGTH;
	INIT_WORK(&priv->bcmgenet_irq_work, bcmgenet_irq_task);

	priv->clk_wol = devm_clk_get(&priv->pdev->dev, "enet-wol");
	if (IS_ERR(priv->clk_wol))
		dev_warn(&priv->pdev->dev, "failed to get enet-wol clock\n");

	err = reset_umac(priv);
	if (err)
		goto err_clk_disable;

	err = bcmgenet_mii_init(dev);
	if (err)
		goto err_clk_disable;

	/* setup number of real queues  + 1 (GENET_V1 has 0 hardware queues
	 * just the ring 16 descriptor based TX
	 */
	netif_set_real_num_tx_queues(priv->dev, priv->hw_params->tx_queues + 1);
	netif_set_real_num_rx_queues(priv->dev, priv->hw_params->rx_queues + 1);

	/* libphy will determine the link state */
	netif_carrier_off(dev);

	/* Turn off the main clock, WOL clock is handled separately */
	if (!IS_ERR(priv->clk))
		clk_disable_unprepare(priv->clk);

	err = register_netdev(dev);
	if (err)
		goto err;

	return err;

err_clk_disable:
	if (!IS_ERR(priv->clk))
		clk_disable_unprepare(priv->clk);
err:
	free_netdev(dev);
	return err;
}

static int bcmgenet_remove(struct platform_device *pdev)
{
	struct bcmgenet_priv *priv = dev_to_priv(&pdev->dev);

	dev_set_drvdata(&pdev->dev, NULL);
	unregister_netdev(priv->dev);
	bcmgenet_mii_exit(priv->dev);
	free_netdev(priv->dev);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int bcmgenet_suspend(struct device *d)
{
	struct net_device *dev = dev_get_drvdata(d);
	struct bcmgenet_priv *priv = netdev_priv(dev);
	int ret;

	if (!netif_running(dev))
		return 0;

	bcmgenet_netif_stop(dev);

	phy_suspend(priv->phydev);

	netif_device_detach(dev);

	/* Disable MAC receive */
	umac_enable_set(priv, CMD_RX_EN, false);

	ret = bcmgenet_dma_teardown(priv);
	if (ret)
		return ret;

	/* Disable MAC transmit. TX DMA disabled have to done before this */
	umac_enable_set(priv, CMD_TX_EN, false);

	/* tx reclaim */
	bcmgenet_tx_reclaim_all(dev);
	bcmgenet_fini_dma(priv);

	/* Prepare the device for Wake-on-LAN and switch to the slow clock */
	if (device_may_wakeup(d) && priv->wolopts) {
		bcmgenet_power_down(priv, GENET_POWER_WOL_MAGIC);
		clk_prepare_enable(priv->clk_wol);
	}

	/* Turn off the clocks */
	clk_disable_unprepare(priv->clk);

	return 0;
}

static int bcmgenet_resume(struct device *d)
{
	struct net_device *dev = dev_get_drvdata(d);
	struct bcmgenet_priv *priv = netdev_priv(dev);
	unsigned long dma_ctrl;
	int ret;
	u32 reg;

	if (!netif_running(dev))
		return 0;

	/* Turn on the clock */
	ret = clk_prepare_enable(priv->clk);
	if (ret)
		return ret;

	bcmgenet_umac_reset(priv);

	ret = init_umac(priv);
	if (ret)
		goto out_clk_disable;

	/* From WOL-enabled suspend, switch to regular clock */
	if (priv->wolopts)
		clk_disable_unprepare(priv->clk_wol);

	phy_init_hw(priv->phydev);
	/* Speed settings must be restored */
	bcmgenet_mii_config(priv->dev, false);

	/* disable ethernet MAC while updating its registers */
	umac_enable_set(priv, CMD_TX_EN | CMD_RX_EN, false);

	bcmgenet_set_hw_addr(priv, dev->dev_addr);

	if (phy_is_internal(priv->phydev)) {
		reg = bcmgenet_ext_readl(priv, EXT_EXT_PWR_MGMT);
		reg |= EXT_ENERGY_DET_MASK;
		bcmgenet_ext_writel(priv, reg, EXT_EXT_PWR_MGMT);
	}

	if (priv->wolopts)
		bcmgenet_power_up(priv, GENET_POWER_WOL_MAGIC);

	/* Disable RX/TX DMA and flush TX queues */
	dma_ctrl = bcmgenet_dma_disable(priv);

	/* Reinitialize TDMA and RDMA and SW housekeeping */
	ret = bcmgenet_init_dma(priv);
	if (ret) {
		netdev_err(dev, "failed to initialize DMA\n");
		goto out_clk_disable;
	}

	/* Always enable ring 16 - descriptor ring */
	bcmgenet_enable_dma(priv, dma_ctrl);

	netif_device_attach(dev);

	phy_resume(priv->phydev);

	bcmgenet_netif_start(dev);

	return 0;

out_clk_disable:
	clk_disable_unprepare(priv->clk);
	return ret;
}
#endif /* CONFIG_PM_SLEEP */

static SIMPLE_DEV_PM_OPS(bcmgenet_pm_ops, bcmgenet_suspend, bcmgenet_resume);

static struct platform_driver bcmgenet_driver = {
	.probe	= bcmgenet_probe,
	.remove	= bcmgenet_remove,
	.driver	= {
		.name	= "bcmgenet",
		.owner	= THIS_MODULE,
		.of_match_table = bcmgenet_match,
		.pm	= &bcmgenet_pm_ops,
	},
};
module_platform_driver(bcmgenet_driver);

MODULE_AUTHOR("Broadcom Corporation");
MODULE_DESCRIPTION("Broadcom GENET Ethernet controller driver");
MODULE_ALIAS("platform:bcmgenet");
MODULE_LICENSE("GPL");