summaryrefslogtreecommitdiff
path: root/drivers/net/ethernet/cadence/macb_main.c
blob: 181ebc2359255f3e77635163f3e136876528a359 (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
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
4981
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
5024
5025
5026
5027
5028
5029
5030
5031
5032
5033
5034
5035
5036
5037
5038
5039
5040
5041
5042
5043
5044
5045
5046
5047
5048
5049
5050
5051
5052
5053
5054
5055
5056
5057
5058
5059
5060
5061
5062
5063
5064
5065
5066
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Cadence MACB/GEM Ethernet Controller driver
 *
 * Copyright (C) 2004-2006 Atmel Corporation
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/crc32.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/circ_buf.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/interrupt.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include <linux/phylink.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/of_mdio.h>
#include <linux/of_net.h>
#include <linux/ip.h>
#include <linux/udp.h>
#include <linux/tcp.h>
#include <linux/iopoll.h>
#include <linux/pm_runtime.h>
#include "macb.h"

/* This structure is only used for MACB on SiFive FU540 devices */
struct sifive_fu540_macb_mgmt {
	void __iomem *reg;
	unsigned long rate;
	struct clk_hw hw;
};

#define MACB_RX_BUFFER_SIZE	128
#define RX_BUFFER_MULTIPLE	64  /* bytes */

#define DEFAULT_RX_RING_SIZE	512 /* must be power of 2 */
#define MIN_RX_RING_SIZE	64
#define MAX_RX_RING_SIZE	8192
#define RX_RING_BYTES(bp)	(macb_dma_desc_get_size(bp)	\
				 * (bp)->rx_ring_size)

#define DEFAULT_TX_RING_SIZE	512 /* must be power of 2 */
#define MIN_TX_RING_SIZE	64
#define MAX_TX_RING_SIZE	4096
#define TX_RING_BYTES(bp)	(macb_dma_desc_get_size(bp)	\
				 * (bp)->tx_ring_size)

/* level of occupied TX descriptors under which we wake up TX process */
#define MACB_TX_WAKEUP_THRESH(bp)	(3 * (bp)->tx_ring_size / 4)

#define MACB_RX_INT_FLAGS	(MACB_BIT(RCOMP) | MACB_BIT(ISR_ROVR))
#define MACB_TX_ERR_FLAGS	(MACB_BIT(ISR_TUND)			\
					| MACB_BIT(ISR_RLE)		\
					| MACB_BIT(TXERR))
#define MACB_TX_INT_FLAGS	(MACB_TX_ERR_FLAGS | MACB_BIT(TCOMP)	\
					| MACB_BIT(TXUBR))

/* Max length of transmit frame must be a multiple of 8 bytes */
#define MACB_TX_LEN_ALIGN	8
#define MACB_MAX_TX_LEN		((unsigned int)((1 << MACB_TX_FRMLEN_SIZE) - 1) & ~((unsigned int)(MACB_TX_LEN_ALIGN - 1)))
/* Limit maximum TX length as per Cadence TSO errata. This is to avoid a
 * false amba_error in TX path from the DMA assuming there is not enough
 * space in the SRAM (16KB) even when there is.
 */
#define GEM_MAX_TX_LEN		(unsigned int)(0x3FC0)

#define GEM_MTU_MIN_SIZE	ETH_MIN_MTU
#define MACB_NETIF_LSO		NETIF_F_TSO

#define MACB_WOL_HAS_MAGIC_PACKET	(0x1 << 0)
#define MACB_WOL_ENABLED		(0x1 << 1)

#define HS_SPEED_10000M			4
#define MACB_SERDES_RATE_10G		1

/* Graceful stop timeouts in us. We should allow up to
 * 1 frame time (10 Mbits/s, full-duplex, ignoring collisions)
 */
#define MACB_HALT_TIMEOUT	1230

#define MACB_PM_TIMEOUT  100 /* ms */

#define MACB_MDIO_TIMEOUT	1000000 /* in usecs */

/* DMA buffer descriptor might be different size
 * depends on hardware configuration:
 *
 * 1. dma address width 32 bits:
 *    word 1: 32 bit address of Data Buffer
 *    word 2: control
 *
 * 2. dma address width 64 bits:
 *    word 1: 32 bit address of Data Buffer
 *    word 2: control
 *    word 3: upper 32 bit address of Data Buffer
 *    word 4: unused
 *
 * 3. dma address width 32 bits with hardware timestamping:
 *    word 1: 32 bit address of Data Buffer
 *    word 2: control
 *    word 3: timestamp word 1
 *    word 4: timestamp word 2
 *
 * 4. dma address width 64 bits with hardware timestamping:
 *    word 1: 32 bit address of Data Buffer
 *    word 2: control
 *    word 3: upper 32 bit address of Data Buffer
 *    word 4: unused
 *    word 5: timestamp word 1
 *    word 6: timestamp word 2
 */
static unsigned int macb_dma_desc_get_size(struct macb *bp)
{
#ifdef MACB_EXT_DESC
	unsigned int desc_size;

	switch (bp->hw_dma_cap) {
	case HW_DMA_CAP_64B:
		desc_size = sizeof(struct macb_dma_desc)
			+ sizeof(struct macb_dma_desc_64);
		break;
	case HW_DMA_CAP_PTP:
		desc_size = sizeof(struct macb_dma_desc)
			+ sizeof(struct macb_dma_desc_ptp);
		break;
	case HW_DMA_CAP_64B_PTP:
		desc_size = sizeof(struct macb_dma_desc)
			+ sizeof(struct macb_dma_desc_64)
			+ sizeof(struct macb_dma_desc_ptp);
		break;
	default:
		desc_size = sizeof(struct macb_dma_desc);
	}
	return desc_size;
#endif
	return sizeof(struct macb_dma_desc);
}

static unsigned int macb_adj_dma_desc_idx(struct macb *bp, unsigned int desc_idx)
{
#ifdef MACB_EXT_DESC
	switch (bp->hw_dma_cap) {
	case HW_DMA_CAP_64B:
	case HW_DMA_CAP_PTP:
		desc_idx <<= 1;
		break;
	case HW_DMA_CAP_64B_PTP:
		desc_idx *= 3;
		break;
	default:
		break;
	}
#endif
	return desc_idx;
}

#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
static struct macb_dma_desc_64 *macb_64b_desc(struct macb *bp, struct macb_dma_desc *desc)
{
	return (struct macb_dma_desc_64 *)((void *)desc
		+ sizeof(struct macb_dma_desc));
}
#endif

/* Ring buffer accessors */
static unsigned int macb_tx_ring_wrap(struct macb *bp, unsigned int index)
{
	return index & (bp->tx_ring_size - 1);
}

static struct macb_dma_desc *macb_tx_desc(struct macb_queue *queue,
					  unsigned int index)
{
	index = macb_tx_ring_wrap(queue->bp, index);
	index = macb_adj_dma_desc_idx(queue->bp, index);
	return &queue->tx_ring[index];
}

static struct macb_tx_skb *macb_tx_skb(struct macb_queue *queue,
				       unsigned int index)
{
	return &queue->tx_skb[macb_tx_ring_wrap(queue->bp, index)];
}

static dma_addr_t macb_tx_dma(struct macb_queue *queue, unsigned int index)
{
	dma_addr_t offset;

	offset = macb_tx_ring_wrap(queue->bp, index) *
			macb_dma_desc_get_size(queue->bp);

	return queue->tx_ring_dma + offset;
}

static unsigned int macb_rx_ring_wrap(struct macb *bp, unsigned int index)
{
	return index & (bp->rx_ring_size - 1);
}

static struct macb_dma_desc *macb_rx_desc(struct macb_queue *queue, unsigned int index)
{
	index = macb_rx_ring_wrap(queue->bp, index);
	index = macb_adj_dma_desc_idx(queue->bp, index);
	return &queue->rx_ring[index];
}

static void *macb_rx_buffer(struct macb_queue *queue, unsigned int index)
{
	return queue->rx_buffers + queue->bp->rx_buffer_size *
	       macb_rx_ring_wrap(queue->bp, index);
}

/* I/O accessors */
static u32 hw_readl_native(struct macb *bp, int offset)
{
	return __raw_readl(bp->regs + offset);
}

static void hw_writel_native(struct macb *bp, int offset, u32 value)
{
	__raw_writel(value, bp->regs + offset);
}

static u32 hw_readl(struct macb *bp, int offset)
{
	return readl_relaxed(bp->regs + offset);
}

static void hw_writel(struct macb *bp, int offset, u32 value)
{
	writel_relaxed(value, bp->regs + offset);
}

/* Find the CPU endianness by using the loopback bit of NCR register. When the
 * CPU is in big endian we need to program swapped mode for management
 * descriptor access.
 */
static bool hw_is_native_io(void __iomem *addr)
{
	u32 value = MACB_BIT(LLB);

	__raw_writel(value, addr + MACB_NCR);
	value = __raw_readl(addr + MACB_NCR);

	/* Write 0 back to disable everything */
	__raw_writel(0, addr + MACB_NCR);

	return value == MACB_BIT(LLB);
}

static bool hw_is_gem(void __iomem *addr, bool native_io)
{
	u32 id;

	if (native_io)
		id = __raw_readl(addr + MACB_MID);
	else
		id = readl_relaxed(addr + MACB_MID);

	return MACB_BFEXT(IDNUM, id) >= 0x2;
}

static void macb_set_hwaddr(struct macb *bp)
{
	u32 bottom;
	u16 top;

	bottom = cpu_to_le32(*((u32 *)bp->dev->dev_addr));
	macb_or_gem_writel(bp, SA1B, bottom);
	top = cpu_to_le16(*((u16 *)(bp->dev->dev_addr + 4)));
	macb_or_gem_writel(bp, SA1T, top);

	/* Clear unused address register sets */
	macb_or_gem_writel(bp, SA2B, 0);
	macb_or_gem_writel(bp, SA2T, 0);
	macb_or_gem_writel(bp, SA3B, 0);
	macb_or_gem_writel(bp, SA3T, 0);
	macb_or_gem_writel(bp, SA4B, 0);
	macb_or_gem_writel(bp, SA4T, 0);
}

static void macb_get_hwaddr(struct macb *bp)
{
	u32 bottom;
	u16 top;
	u8 addr[6];
	int i;

	/* Check all 4 address register for valid address */
	for (i = 0; i < 4; i++) {
		bottom = macb_or_gem_readl(bp, SA1B + i * 8);
		top = macb_or_gem_readl(bp, SA1T + i * 8);

		addr[0] = bottom & 0xff;
		addr[1] = (bottom >> 8) & 0xff;
		addr[2] = (bottom >> 16) & 0xff;
		addr[3] = (bottom >> 24) & 0xff;
		addr[4] = top & 0xff;
		addr[5] = (top >> 8) & 0xff;

		if (is_valid_ether_addr(addr)) {
			memcpy(bp->dev->dev_addr, addr, sizeof(addr));
			return;
		}
	}

	dev_info(&bp->pdev->dev, "invalid hw address, using random\n");
	eth_hw_addr_random(bp->dev);
}

static int macb_mdio_wait_for_idle(struct macb *bp)
{
	u32 val;

	return readx_poll_timeout(MACB_READ_NSR, bp, val, val & MACB_BIT(IDLE),
				  1, MACB_MDIO_TIMEOUT);
}

static int macb_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
{
	struct macb *bp = bus->priv;
	int status;

	status = pm_runtime_get_sync(&bp->pdev->dev);
	if (status < 0) {
		pm_runtime_put_noidle(&bp->pdev->dev);
		goto mdio_pm_exit;
	}

	status = macb_mdio_wait_for_idle(bp);
	if (status < 0)
		goto mdio_read_exit;

	if (regnum & MII_ADDR_C45) {
		macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_C45_SOF)
			    | MACB_BF(RW, MACB_MAN_C45_ADDR)
			    | MACB_BF(PHYA, mii_id)
			    | MACB_BF(REGA, (regnum >> 16) & 0x1F)
			    | MACB_BF(DATA, regnum & 0xFFFF)
			    | MACB_BF(CODE, MACB_MAN_C45_CODE)));

		status = macb_mdio_wait_for_idle(bp);
		if (status < 0)
			goto mdio_read_exit;

		macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_C45_SOF)
			    | MACB_BF(RW, MACB_MAN_C45_READ)
			    | MACB_BF(PHYA, mii_id)
			    | MACB_BF(REGA, (regnum >> 16) & 0x1F)
			    | MACB_BF(CODE, MACB_MAN_C45_CODE)));
	} else {
		macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_C22_SOF)
				| MACB_BF(RW, MACB_MAN_C22_READ)
				| MACB_BF(PHYA, mii_id)
				| MACB_BF(REGA, regnum)
				| MACB_BF(CODE, MACB_MAN_C22_CODE)));
	}

	status = macb_mdio_wait_for_idle(bp);
	if (status < 0)
		goto mdio_read_exit;

	status = MACB_BFEXT(DATA, macb_readl(bp, MAN));

mdio_read_exit:
	pm_runtime_mark_last_busy(&bp->pdev->dev);
	pm_runtime_put_autosuspend(&bp->pdev->dev);
mdio_pm_exit:
	return status;
}

static int macb_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
			   u16 value)
{
	struct macb *bp = bus->priv;
	int status;

	status = pm_runtime_get_sync(&bp->pdev->dev);
	if (status < 0) {
		pm_runtime_put_noidle(&bp->pdev->dev);
		goto mdio_pm_exit;
	}

	status = macb_mdio_wait_for_idle(bp);
	if (status < 0)
		goto mdio_write_exit;

	if (regnum & MII_ADDR_C45) {
		macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_C45_SOF)
			    | MACB_BF(RW, MACB_MAN_C45_ADDR)
			    | MACB_BF(PHYA, mii_id)
			    | MACB_BF(REGA, (regnum >> 16) & 0x1F)
			    | MACB_BF(DATA, regnum & 0xFFFF)
			    | MACB_BF(CODE, MACB_MAN_C45_CODE)));

		status = macb_mdio_wait_for_idle(bp);
		if (status < 0)
			goto mdio_write_exit;

		macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_C45_SOF)
			    | MACB_BF(RW, MACB_MAN_C45_WRITE)
			    | MACB_BF(PHYA, mii_id)
			    | MACB_BF(REGA, (regnum >> 16) & 0x1F)
			    | MACB_BF(CODE, MACB_MAN_C45_CODE)
			    | MACB_BF(DATA, value)));
	} else {
		macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_C22_SOF)
				| MACB_BF(RW, MACB_MAN_C22_WRITE)
				| MACB_BF(PHYA, mii_id)
				| MACB_BF(REGA, regnum)
				| MACB_BF(CODE, MACB_MAN_C22_CODE)
				| MACB_BF(DATA, value)));
	}

	status = macb_mdio_wait_for_idle(bp);
	if (status < 0)
		goto mdio_write_exit;

mdio_write_exit:
	pm_runtime_mark_last_busy(&bp->pdev->dev);
	pm_runtime_put_autosuspend(&bp->pdev->dev);
mdio_pm_exit:
	return status;
}

static void macb_init_buffers(struct macb *bp)
{
	struct macb_queue *queue;
	unsigned int q;

	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
		queue_writel(queue, RBQP, lower_32_bits(queue->rx_ring_dma));
#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
		if (bp->hw_dma_cap & HW_DMA_CAP_64B)
			queue_writel(queue, RBQPH,
				     upper_32_bits(queue->rx_ring_dma));
#endif
		queue_writel(queue, TBQP, lower_32_bits(queue->tx_ring_dma));
#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
		if (bp->hw_dma_cap & HW_DMA_CAP_64B)
			queue_writel(queue, TBQPH,
				     upper_32_bits(queue->tx_ring_dma));
#endif
	}
}

/**
 * macb_set_tx_clk() - Set a clock to a new frequency
 * @bp:		pointer to struct macb
 * @speed:	New frequency in Hz
 */
static void macb_set_tx_clk(struct macb *bp, int speed)
{
	long ferr, rate, rate_rounded;

	if (!bp->tx_clk || (bp->caps & MACB_CAPS_CLK_HW_CHG))
		return;

	/* In case of MII the PHY is the clock master */
	if (bp->phy_interface == PHY_INTERFACE_MODE_MII)
		return;

	switch (speed) {
	case SPEED_10:
		rate = 2500000;
		break;
	case SPEED_100:
		rate = 25000000;
		break;
	case SPEED_1000:
		rate = 125000000;
		break;
	default:
		return;
	}

	rate_rounded = clk_round_rate(bp->tx_clk, rate);
	if (rate_rounded < 0)
		return;

	/* RGMII allows 50 ppm frequency error. Test and warn if this limit
	 * is not satisfied.
	 */
	ferr = abs(rate_rounded - rate);
	ferr = DIV_ROUND_UP(ferr, rate / 100000);
	if (ferr > 5)
		netdev_warn(bp->dev,
			    "unable to generate target frequency: %ld Hz\n",
			    rate);

	if (clk_set_rate(bp->tx_clk, rate_rounded))
		netdev_err(bp->dev, "adjusting tx_clk failed.\n");
}

static void macb_validate(struct phylink_config *config,
			  unsigned long *supported,
			  struct phylink_link_state *state)
{
	struct net_device *ndev = to_net_dev(config->dev);
	__ETHTOOL_DECLARE_LINK_MODE_MASK(mask) = { 0, };
	struct macb *bp = netdev_priv(ndev);

	/* We only support MII, RMII, GMII, RGMII & SGMII. */
	if (state->interface != PHY_INTERFACE_MODE_NA &&
	    state->interface != PHY_INTERFACE_MODE_MII &&
	    state->interface != PHY_INTERFACE_MODE_RMII &&
	    state->interface != PHY_INTERFACE_MODE_GMII &&
	    state->interface != PHY_INTERFACE_MODE_SGMII &&
	    state->interface != PHY_INTERFACE_MODE_10GBASER &&
	    !phy_interface_mode_is_rgmii(state->interface)) {
		bitmap_zero(supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
		return;
	}

	if (!macb_is_gem(bp) &&
	    (state->interface == PHY_INTERFACE_MODE_GMII ||
	     phy_interface_mode_is_rgmii(state->interface))) {
		bitmap_zero(supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
		return;
	}

	if (state->interface == PHY_INTERFACE_MODE_10GBASER &&
	    !(bp->caps & MACB_CAPS_HIGH_SPEED &&
	      bp->caps & MACB_CAPS_PCS)) {
		bitmap_zero(supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
		return;
	}

	phylink_set_port_modes(mask);
	phylink_set(mask, Autoneg);
	phylink_set(mask, Asym_Pause);

	if (bp->caps & MACB_CAPS_GIGABIT_MODE_AVAILABLE &&
	    (state->interface == PHY_INTERFACE_MODE_NA ||
	     state->interface == PHY_INTERFACE_MODE_10GBASER)) {
		phylink_set(mask, 10000baseCR_Full);
		phylink_set(mask, 10000baseER_Full);
		phylink_set(mask, 10000baseKR_Full);
		phylink_set(mask, 10000baseLR_Full);
		phylink_set(mask, 10000baseLRM_Full);
		phylink_set(mask, 10000baseSR_Full);
		phylink_set(mask, 10000baseT_Full);
		if (state->interface != PHY_INTERFACE_MODE_NA)
			goto out;
	}

	phylink_set(mask, 10baseT_Half);
	phylink_set(mask, 10baseT_Full);
	phylink_set(mask, 100baseT_Half);
	phylink_set(mask, 100baseT_Full);

	if (bp->caps & MACB_CAPS_GIGABIT_MODE_AVAILABLE &&
	    (state->interface == PHY_INTERFACE_MODE_NA ||
	     state->interface == PHY_INTERFACE_MODE_GMII ||
	     state->interface == PHY_INTERFACE_MODE_SGMII ||
	     phy_interface_mode_is_rgmii(state->interface))) {
		phylink_set(mask, 1000baseT_Full);
		phylink_set(mask, 1000baseX_Full);

		if (!(bp->caps & MACB_CAPS_NO_GIGABIT_HALF))
			phylink_set(mask, 1000baseT_Half);
	}
out:
	bitmap_and(supported, supported, mask, __ETHTOOL_LINK_MODE_MASK_NBITS);
	bitmap_and(state->advertising, state->advertising, mask,
		   __ETHTOOL_LINK_MODE_MASK_NBITS);
}

static void macb_usx_pcs_link_up(struct phylink_pcs *pcs, unsigned int mode,
				 phy_interface_t interface, int speed,
				 int duplex)
{
	struct macb *bp = container_of(pcs, struct macb, phylink_pcs);
	u32 config;

	config = gem_readl(bp, USX_CONTROL);
	config = GEM_BFINS(SERDES_RATE, MACB_SERDES_RATE_10G, config);
	config = GEM_BFINS(USX_CTRL_SPEED, HS_SPEED_10000M, config);
	config &= ~(GEM_BIT(TX_SCR_BYPASS) | GEM_BIT(RX_SCR_BYPASS));
	config |= GEM_BIT(TX_EN);
	gem_writel(bp, USX_CONTROL, config);
}

static void macb_usx_pcs_get_state(struct phylink_pcs *pcs,
				   struct phylink_link_state *state)
{
	struct macb *bp = container_of(pcs, struct macb, phylink_pcs);
	u32 val;

	state->speed = SPEED_10000;
	state->duplex = 1;
	state->an_complete = 1;

	val = gem_readl(bp, USX_STATUS);
	state->link = !!(val & GEM_BIT(USX_BLOCK_LOCK));
	val = gem_readl(bp, NCFGR);
	if (val & GEM_BIT(PAE))
		state->pause = MLO_PAUSE_RX;
}

static int macb_usx_pcs_config(struct phylink_pcs *pcs,
			       unsigned int mode,
			       phy_interface_t interface,
			       const unsigned long *advertising,
			       bool permit_pause_to_mac)
{
	struct macb *bp = container_of(pcs, struct macb, phylink_pcs);

	gem_writel(bp, USX_CONTROL, gem_readl(bp, USX_CONTROL) |
		   GEM_BIT(SIGNAL_OK));

	return 0;
}

static void macb_pcs_get_state(struct phylink_pcs *pcs,
			       struct phylink_link_state *state)
{
	state->link = 0;
}

static void macb_pcs_an_restart(struct phylink_pcs *pcs)
{
	/* Not supported */
}

static int macb_pcs_config(struct phylink_pcs *pcs,
			   unsigned int mode,
			   phy_interface_t interface,
			   const unsigned long *advertising,
			   bool permit_pause_to_mac)
{
	return 0;
}

static const struct phylink_pcs_ops macb_phylink_usx_pcs_ops = {
	.pcs_get_state = macb_usx_pcs_get_state,
	.pcs_config = macb_usx_pcs_config,
	.pcs_link_up = macb_usx_pcs_link_up,
};

static const struct phylink_pcs_ops macb_phylink_pcs_ops = {
	.pcs_get_state = macb_pcs_get_state,
	.pcs_an_restart = macb_pcs_an_restart,
	.pcs_config = macb_pcs_config,
};

static void macb_mac_config(struct phylink_config *config, unsigned int mode,
			    const struct phylink_link_state *state)
{
	struct net_device *ndev = to_net_dev(config->dev);
	struct macb *bp = netdev_priv(ndev);
	unsigned long flags;
	u32 old_ctrl, ctrl;
	u32 old_ncr, ncr;

	spin_lock_irqsave(&bp->lock, flags);

	old_ctrl = ctrl = macb_or_gem_readl(bp, NCFGR);
	old_ncr = ncr = macb_or_gem_readl(bp, NCR);

	if (bp->caps & MACB_CAPS_MACB_IS_EMAC) {
		if (state->interface == PHY_INTERFACE_MODE_RMII)
			ctrl |= MACB_BIT(RM9200_RMII);
	} else if (macb_is_gem(bp)) {
		ctrl &= ~(GEM_BIT(SGMIIEN) | GEM_BIT(PCSSEL));
		ncr &= ~GEM_BIT(ENABLE_HS_MAC);

		if (state->interface == PHY_INTERFACE_MODE_SGMII) {
			ctrl |= GEM_BIT(SGMIIEN) | GEM_BIT(PCSSEL);
		} else if (state->interface == PHY_INTERFACE_MODE_10GBASER) {
			ctrl |= GEM_BIT(PCSSEL);
			ncr |= GEM_BIT(ENABLE_HS_MAC);
		}
	}

	/* Apply the new configuration, if any */
	if (old_ctrl ^ ctrl)
		macb_or_gem_writel(bp, NCFGR, ctrl);

	if (old_ncr ^ ncr)
		macb_or_gem_writel(bp, NCR, ncr);

	/* Disable AN for SGMII fixed link configuration, enable otherwise.
	 * Must be written after PCSSEL is set in NCFGR,
	 * otherwise writes will not take effect.
	 */
	if (macb_is_gem(bp) && state->interface == PHY_INTERFACE_MODE_SGMII) {
		u32 pcsctrl, old_pcsctrl;

		old_pcsctrl = gem_readl(bp, PCSCNTRL);
		if (mode == MLO_AN_FIXED)
			pcsctrl = old_pcsctrl & ~GEM_BIT(PCSAUTONEG);
		else
			pcsctrl = old_pcsctrl | GEM_BIT(PCSAUTONEG);
		if (old_pcsctrl != pcsctrl)
			gem_writel(bp, PCSCNTRL, pcsctrl);
	}

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

static void macb_mac_link_down(struct phylink_config *config, unsigned int mode,
			       phy_interface_t interface)
{
	struct net_device *ndev = to_net_dev(config->dev);
	struct macb *bp = netdev_priv(ndev);
	struct macb_queue *queue;
	unsigned int q;
	u32 ctrl;

	if (!(bp->caps & MACB_CAPS_MACB_IS_EMAC))
		for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue)
			queue_writel(queue, IDR,
				     bp->rx_intr_mask | MACB_TX_INT_FLAGS | MACB_BIT(HRESP));

	/* Disable Rx and Tx */
	ctrl = macb_readl(bp, NCR) & ~(MACB_BIT(RE) | MACB_BIT(TE));
	macb_writel(bp, NCR, ctrl);

	netif_tx_stop_all_queues(ndev);
}

static void macb_mac_link_up(struct phylink_config *config,
			     struct phy_device *phy,
			     unsigned int mode, phy_interface_t interface,
			     int speed, int duplex,
			     bool tx_pause, bool rx_pause)
{
	struct net_device *ndev = to_net_dev(config->dev);
	struct macb *bp = netdev_priv(ndev);
	struct macb_queue *queue;
	unsigned long flags;
	unsigned int q;
	u32 ctrl;

	spin_lock_irqsave(&bp->lock, flags);

	ctrl = macb_or_gem_readl(bp, NCFGR);

	ctrl &= ~(MACB_BIT(SPD) | MACB_BIT(FD));

	if (speed == SPEED_100)
		ctrl |= MACB_BIT(SPD);

	if (duplex)
		ctrl |= MACB_BIT(FD);

	if (!(bp->caps & MACB_CAPS_MACB_IS_EMAC)) {
		ctrl &= ~MACB_BIT(PAE);
		if (macb_is_gem(bp)) {
			ctrl &= ~GEM_BIT(GBE);

			if (speed == SPEED_1000)
				ctrl |= GEM_BIT(GBE);
		}

		if (rx_pause)
			ctrl |= MACB_BIT(PAE);

		macb_set_tx_clk(bp, speed);

		/* Initialize rings & buffers as clearing MACB_BIT(TE) in link down
		 * cleared the pipeline and control registers.
		 */
		bp->macbgem_ops.mog_init_rings(bp);
		macb_init_buffers(bp);

		for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue)
			queue_writel(queue, IER,
				     bp->rx_intr_mask | MACB_TX_INT_FLAGS | MACB_BIT(HRESP));
	}

	macb_or_gem_writel(bp, NCFGR, ctrl);

	if (bp->phy_interface == PHY_INTERFACE_MODE_10GBASER)
		gem_writel(bp, HS_MAC_CONFIG, GEM_BFINS(HS_MAC_SPEED, HS_SPEED_10000M,
							gem_readl(bp, HS_MAC_CONFIG)));

	spin_unlock_irqrestore(&bp->lock, flags);

	/* Enable Rx and Tx */
	macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(RE) | MACB_BIT(TE));

	netif_tx_wake_all_queues(ndev);
}

static int macb_mac_prepare(struct phylink_config *config, unsigned int mode,
			    phy_interface_t interface)
{
	struct net_device *ndev = to_net_dev(config->dev);
	struct macb *bp = netdev_priv(ndev);

	if (interface == PHY_INTERFACE_MODE_10GBASER)
		bp->phylink_pcs.ops = &macb_phylink_usx_pcs_ops;
	else if (interface == PHY_INTERFACE_MODE_SGMII)
		bp->phylink_pcs.ops = &macb_phylink_pcs_ops;
	else
		bp->phylink_pcs.ops = NULL;

	if (bp->phylink_pcs.ops)
		phylink_set_pcs(bp->phylink, &bp->phylink_pcs);

	return 0;
}

static const struct phylink_mac_ops macb_phylink_ops = {
	.validate = macb_validate,
	.mac_prepare = macb_mac_prepare,
	.mac_config = macb_mac_config,
	.mac_link_down = macb_mac_link_down,
	.mac_link_up = macb_mac_link_up,
};

static bool macb_phy_handle_exists(struct device_node *dn)
{
	dn = of_parse_phandle(dn, "phy-handle", 0);
	of_node_put(dn);
	return dn != NULL;
}

static int macb_phylink_connect(struct macb *bp)
{
	struct device_node *dn = bp->pdev->dev.of_node;
	struct net_device *dev = bp->dev;
	struct phy_device *phydev;
	int ret;

	if (dn)
		ret = phylink_of_phy_connect(bp->phylink, dn, 0);

	if (!dn || (ret && !macb_phy_handle_exists(dn))) {
		phydev = phy_find_first(bp->mii_bus);
		if (!phydev) {
			netdev_err(dev, "no PHY found\n");
			return -ENXIO;
		}

		/* attach the mac to the phy */
		ret = phylink_connect_phy(bp->phylink, phydev);
	}

	if (ret) {
		netdev_err(dev, "Could not attach PHY (%d)\n", ret);
		return ret;
	}

	phylink_start(bp->phylink);

	return 0;
}

static void macb_get_pcs_fixed_state(struct phylink_config *config,
				     struct phylink_link_state *state)
{
	struct net_device *ndev = to_net_dev(config->dev);
	struct macb *bp = netdev_priv(ndev);

	state->link = (macb_readl(bp, NSR) & MACB_BIT(NSR_LINK)) != 0;
}

/* based on au1000_eth. c*/
static int macb_mii_probe(struct net_device *dev)
{
	struct macb *bp = netdev_priv(dev);

	bp->phylink_config.dev = &dev->dev;
	bp->phylink_config.type = PHYLINK_NETDEV;

	if (bp->phy_interface == PHY_INTERFACE_MODE_SGMII) {
		bp->phylink_config.poll_fixed_state = true;
		bp->phylink_config.get_fixed_state = macb_get_pcs_fixed_state;
	}

	bp->phylink = phylink_create(&bp->phylink_config, bp->pdev->dev.fwnode,
				     bp->phy_interface, &macb_phylink_ops);
	if (IS_ERR(bp->phylink)) {
		netdev_err(dev, "Could not create a phylink instance (%ld)\n",
			   PTR_ERR(bp->phylink));
		return PTR_ERR(bp->phylink);
	}

	return 0;
}

static int macb_mdiobus_register(struct macb *bp)
{
	struct device_node *child, *np = bp->pdev->dev.of_node;

	if (of_phy_is_fixed_link(np))
		return mdiobus_register(bp->mii_bus);

	/* Only create the PHY from the device tree if at least one PHY is
	 * described. Otherwise scan the entire MDIO bus. We do this to support
	 * old device tree that did not follow the best practices and did not
	 * describe their network PHYs.
	 */
	for_each_available_child_of_node(np, child)
		if (of_mdiobus_child_is_phy(child)) {
			/* The loop increments the child refcount,
			 * decrement it before returning.
			 */
			of_node_put(child);

			return of_mdiobus_register(bp->mii_bus, np);
		}

	return mdiobus_register(bp->mii_bus);
}

static int macb_mii_init(struct macb *bp)
{
	int err = -ENXIO;

	/* Enable management port */
	macb_writel(bp, NCR, MACB_BIT(MPE));

	bp->mii_bus = mdiobus_alloc();
	if (!bp->mii_bus) {
		err = -ENOMEM;
		goto err_out;
	}

	bp->mii_bus->name = "MACB_mii_bus";
	bp->mii_bus->read = &macb_mdio_read;
	bp->mii_bus->write = &macb_mdio_write;
	snprintf(bp->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
		 bp->pdev->name, bp->pdev->id);
	bp->mii_bus->priv = bp;
	bp->mii_bus->parent = &bp->pdev->dev;

	dev_set_drvdata(&bp->dev->dev, bp->mii_bus);

	err = macb_mdiobus_register(bp);
	if (err)
		goto err_out_free_mdiobus;

	err = macb_mii_probe(bp->dev);
	if (err)
		goto err_out_unregister_bus;

	return 0;

err_out_unregister_bus:
	mdiobus_unregister(bp->mii_bus);
err_out_free_mdiobus:
	mdiobus_free(bp->mii_bus);
err_out:
	return err;
}

static void macb_update_stats(struct macb *bp)
{
	u32 *p = &bp->hw_stats.macb.rx_pause_frames;
	u32 *end = &bp->hw_stats.macb.tx_pause_frames + 1;
	int offset = MACB_PFR;

	WARN_ON((unsigned long)(end - p - 1) != (MACB_TPF - MACB_PFR) / 4);

	for (; p < end; p++, offset += 4)
		*p += bp->macb_reg_readl(bp, offset);
}

static int macb_halt_tx(struct macb *bp)
{
	unsigned long	halt_time, timeout;
	u32		status;

	macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(THALT));

	timeout = jiffies + usecs_to_jiffies(MACB_HALT_TIMEOUT);
	do {
		halt_time = jiffies;
		status = macb_readl(bp, TSR);
		if (!(status & MACB_BIT(TGO)))
			return 0;

		udelay(250);
	} while (time_before(halt_time, timeout));

	return -ETIMEDOUT;
}

static void macb_tx_unmap(struct macb *bp, struct macb_tx_skb *tx_skb)
{
	if (tx_skb->mapping) {
		if (tx_skb->mapped_as_page)
			dma_unmap_page(&bp->pdev->dev, tx_skb->mapping,
				       tx_skb->size, DMA_TO_DEVICE);
		else
			dma_unmap_single(&bp->pdev->dev, tx_skb->mapping,
					 tx_skb->size, DMA_TO_DEVICE);
		tx_skb->mapping = 0;
	}

	if (tx_skb->skb) {
		dev_kfree_skb_any(tx_skb->skb);
		tx_skb->skb = NULL;
	}
}

static void macb_set_addr(struct macb *bp, struct macb_dma_desc *desc, dma_addr_t addr)
{
#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
	struct macb_dma_desc_64 *desc_64;

	if (bp->hw_dma_cap & HW_DMA_CAP_64B) {
		desc_64 = macb_64b_desc(bp, desc);
		desc_64->addrh = upper_32_bits(addr);
		/* The low bits of RX address contain the RX_USED bit, clearing
		 * of which allows packet RX. Make sure the high bits are also
		 * visible to HW at that point.
		 */
		dma_wmb();
	}
#endif
	desc->addr = lower_32_bits(addr);
}

static dma_addr_t macb_get_addr(struct macb *bp, struct macb_dma_desc *desc)
{
	dma_addr_t addr = 0;
#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
	struct macb_dma_desc_64 *desc_64;

	if (bp->hw_dma_cap & HW_DMA_CAP_64B) {
		desc_64 = macb_64b_desc(bp, desc);
		addr = ((u64)(desc_64->addrh) << 32);
	}
#endif
	addr |= MACB_BF(RX_WADDR, MACB_BFEXT(RX_WADDR, desc->addr));
	return addr;
}

static void macb_tx_error_task(struct work_struct *work)
{
	struct macb_queue	*queue = container_of(work, struct macb_queue,
						      tx_error_task);
	struct macb		*bp = queue->bp;
	struct macb_tx_skb	*tx_skb;
	struct macb_dma_desc	*desc;
	struct sk_buff		*skb;
	unsigned int		tail;
	unsigned long		flags;

	netdev_vdbg(bp->dev, "macb_tx_error_task: q = %u, t = %u, h = %u\n",
		    (unsigned int)(queue - bp->queues),
		    queue->tx_tail, queue->tx_head);

	/* Prevent the queue IRQ handlers from running: each of them may call
	 * macb_tx_interrupt(), which in turn may call netif_wake_subqueue().
	 * As explained below, we have to halt the transmission before updating
	 * TBQP registers so we call netif_tx_stop_all_queues() to notify the
	 * network engine about the macb/gem being halted.
	 */
	spin_lock_irqsave(&bp->lock, flags);

	/* Make sure nobody is trying to queue up new packets */
	netif_tx_stop_all_queues(bp->dev);

	/* Stop transmission now
	 * (in case we have just queued new packets)
	 * macb/gem must be halted to write TBQP register
	 */
	if (macb_halt_tx(bp))
		/* Just complain for now, reinitializing TX path can be good */
		netdev_err(bp->dev, "BUG: halt tx timed out\n");

	/* Treat frames in TX queue including the ones that caused the error.
	 * Free transmit buffers in upper layer.
	 */
	for (tail = queue->tx_tail; tail != queue->tx_head; tail++) {
		u32	ctrl;

		desc = macb_tx_desc(queue, tail);
		ctrl = desc->ctrl;
		tx_skb = macb_tx_skb(queue, tail);
		skb = tx_skb->skb;

		if (ctrl & MACB_BIT(TX_USED)) {
			/* skb is set for the last buffer of the frame */
			while (!skb) {
				macb_tx_unmap(bp, tx_skb);
				tail++;
				tx_skb = macb_tx_skb(queue, tail);
				skb = tx_skb->skb;
			}

			/* ctrl still refers to the first buffer descriptor
			 * since it's the only one written back by the hardware
			 */
			if (!(ctrl & MACB_BIT(TX_BUF_EXHAUSTED))) {
				netdev_vdbg(bp->dev, "txerr skb %u (data %p) TX complete\n",
					    macb_tx_ring_wrap(bp, tail),
					    skb->data);
				bp->dev->stats.tx_packets++;
				queue->stats.tx_packets++;
				bp->dev->stats.tx_bytes += skb->len;
				queue->stats.tx_bytes += skb->len;
			}
		} else {
			/* "Buffers exhausted mid-frame" errors may only happen
			 * if the driver is buggy, so complain loudly about
			 * those. Statistics are updated by hardware.
			 */
			if (ctrl & MACB_BIT(TX_BUF_EXHAUSTED))
				netdev_err(bp->dev,
					   "BUG: TX buffers exhausted mid-frame\n");

			desc->ctrl = ctrl | MACB_BIT(TX_USED);
		}

		macb_tx_unmap(bp, tx_skb);
	}

	/* Set end of TX queue */
	desc = macb_tx_desc(queue, 0);
	macb_set_addr(bp, desc, 0);
	desc->ctrl = MACB_BIT(TX_USED);

	/* Make descriptor updates visible to hardware */
	wmb();

	/* Reinitialize the TX desc queue */
	queue_writel(queue, TBQP, lower_32_bits(queue->tx_ring_dma));
#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
	if (bp->hw_dma_cap & HW_DMA_CAP_64B)
		queue_writel(queue, TBQPH, upper_32_bits(queue->tx_ring_dma));
#endif
	/* Make TX ring reflect state of hardware */
	queue->tx_head = 0;
	queue->tx_tail = 0;

	/* Housework before enabling TX IRQ */
	macb_writel(bp, TSR, macb_readl(bp, TSR));
	queue_writel(queue, IER, MACB_TX_INT_FLAGS);

	/* Now we are ready to start transmission again */
	netif_tx_start_all_queues(bp->dev);
	macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));

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

static void macb_tx_interrupt(struct macb_queue *queue)
{
	unsigned int tail;
	unsigned int head;
	u32 status;
	struct macb *bp = queue->bp;
	u16 queue_index = queue - bp->queues;

	status = macb_readl(bp, TSR);
	macb_writel(bp, TSR, status);

	if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
		queue_writel(queue, ISR, MACB_BIT(TCOMP));

	netdev_vdbg(bp->dev, "macb_tx_interrupt status = 0x%03lx\n",
		    (unsigned long)status);

	head = queue->tx_head;
	for (tail = queue->tx_tail; tail != head; tail++) {
		struct macb_tx_skb	*tx_skb;
		struct sk_buff		*skb;
		struct macb_dma_desc	*desc;
		u32			ctrl;

		desc = macb_tx_desc(queue, tail);

		/* Make hw descriptor updates visible to CPU */
		rmb();

		ctrl = desc->ctrl;

		/* TX_USED bit is only set by hardware on the very first buffer
		 * descriptor of the transmitted frame.
		 */
		if (!(ctrl & MACB_BIT(TX_USED)))
			break;

		/* Process all buffers of the current transmitted frame */
		for (;; tail++) {
			tx_skb = macb_tx_skb(queue, tail);
			skb = tx_skb->skb;

			/* First, update TX stats if needed */
			if (skb) {
				if (unlikely(skb_shinfo(skb)->tx_flags &
					     SKBTX_HW_TSTAMP) &&
				    gem_ptp_do_txstamp(queue, skb, desc) == 0) {
					/* skb now belongs to timestamp buffer
					 * and will be removed later
					 */
					tx_skb->skb = NULL;
				}
				netdev_vdbg(bp->dev, "skb %u (data %p) TX complete\n",
					    macb_tx_ring_wrap(bp, tail),
					    skb->data);
				bp->dev->stats.tx_packets++;
				queue->stats.tx_packets++;
				bp->dev->stats.tx_bytes += skb->len;
				queue->stats.tx_bytes += skb->len;
			}

			/* Now we can safely release resources */
			macb_tx_unmap(bp, tx_skb);

			/* skb is set only for the last buffer of the frame.
			 * WARNING: at this point skb has been freed by
			 * macb_tx_unmap().
			 */
			if (skb)
				break;
		}
	}

	queue->tx_tail = tail;
	if (__netif_subqueue_stopped(bp->dev, queue_index) &&
	    CIRC_CNT(queue->tx_head, queue->tx_tail,
		     bp->tx_ring_size) <= MACB_TX_WAKEUP_THRESH(bp))
		netif_wake_subqueue(bp->dev, queue_index);
}

static void gem_rx_refill(struct macb_queue *queue)
{
	unsigned int		entry;
	struct sk_buff		*skb;
	dma_addr_t		paddr;
	struct macb *bp = queue->bp;
	struct macb_dma_desc *desc;

	while (CIRC_SPACE(queue->rx_prepared_head, queue->rx_tail,
			bp->rx_ring_size) > 0) {
		entry = macb_rx_ring_wrap(bp, queue->rx_prepared_head);

		/* Make hw descriptor updates visible to CPU */
		rmb();

		queue->rx_prepared_head++;
		desc = macb_rx_desc(queue, entry);

		if (!queue->rx_skbuff[entry]) {
			/* allocate sk_buff for this free entry in ring */
			skb = netdev_alloc_skb(bp->dev, bp->rx_buffer_size);
			if (unlikely(!skb)) {
				netdev_err(bp->dev,
					   "Unable to allocate sk_buff\n");
				break;
			}

			/* now fill corresponding descriptor entry */
			paddr = dma_map_single(&bp->pdev->dev, skb->data,
					       bp->rx_buffer_size,
					       DMA_FROM_DEVICE);
			if (dma_mapping_error(&bp->pdev->dev, paddr)) {
				dev_kfree_skb(skb);
				break;
			}

			queue->rx_skbuff[entry] = skb;

			if (entry == bp->rx_ring_size - 1)
				paddr |= MACB_BIT(RX_WRAP);
			desc->ctrl = 0;
			/* Setting addr clears RX_USED and allows reception,
			 * make sure ctrl is cleared first to avoid a race.
			 */
			dma_wmb();
			macb_set_addr(bp, desc, paddr);

			/* properly align Ethernet header */
			skb_reserve(skb, NET_IP_ALIGN);
		} else {
			desc->ctrl = 0;
			dma_wmb();
			desc->addr &= ~MACB_BIT(RX_USED);
		}
	}

	/* Make descriptor updates visible to hardware */
	wmb();

	netdev_vdbg(bp->dev, "rx ring: queue: %p, prepared head %d, tail %d\n",
			queue, queue->rx_prepared_head, queue->rx_tail);
}

/* Mark DMA descriptors from begin up to and not including end as unused */
static void discard_partial_frame(struct macb_queue *queue, unsigned int begin,
				  unsigned int end)
{
	unsigned int frag;

	for (frag = begin; frag != end; frag++) {
		struct macb_dma_desc *desc = macb_rx_desc(queue, frag);

		desc->addr &= ~MACB_BIT(RX_USED);
	}

	/* Make descriptor updates visible to hardware */
	wmb();

	/* When this happens, the hardware stats registers for
	 * whatever caused this is updated, so we don't have to record
	 * anything.
	 */
}

static int gem_rx(struct macb_queue *queue, struct napi_struct *napi,
		  int budget)
{
	struct macb *bp = queue->bp;
	unsigned int		len;
	unsigned int		entry;
	struct sk_buff		*skb;
	struct macb_dma_desc	*desc;
	int			count = 0;

	while (count < budget) {
		u32 ctrl;
		dma_addr_t addr;
		bool rxused;

		entry = macb_rx_ring_wrap(bp, queue->rx_tail);
		desc = macb_rx_desc(queue, entry);

		/* Make hw descriptor updates visible to CPU */
		rmb();

		rxused = (desc->addr & MACB_BIT(RX_USED)) ? true : false;
		addr = macb_get_addr(bp, desc);

		if (!rxused)
			break;

		/* Ensure ctrl is at least as up-to-date as rxused */
		dma_rmb();

		ctrl = desc->ctrl;

		queue->rx_tail++;
		count++;

		if (!(ctrl & MACB_BIT(RX_SOF) && ctrl & MACB_BIT(RX_EOF))) {
			netdev_err(bp->dev,
				   "not whole frame pointed by descriptor\n");
			bp->dev->stats.rx_dropped++;
			queue->stats.rx_dropped++;
			break;
		}
		skb = queue->rx_skbuff[entry];
		if (unlikely(!skb)) {
			netdev_err(bp->dev,
				   "inconsistent Rx descriptor chain\n");
			bp->dev->stats.rx_dropped++;
			queue->stats.rx_dropped++;
			break;
		}
		/* now everything is ready for receiving packet */
		queue->rx_skbuff[entry] = NULL;
		len = ctrl & bp->rx_frm_len_mask;

		netdev_vdbg(bp->dev, "gem_rx %u (len %u)\n", entry, len);

		skb_put(skb, len);
		dma_unmap_single(&bp->pdev->dev, addr,
				 bp->rx_buffer_size, DMA_FROM_DEVICE);

		skb->protocol = eth_type_trans(skb, bp->dev);
		skb_checksum_none_assert(skb);
		if (bp->dev->features & NETIF_F_RXCSUM &&
		    !(bp->dev->flags & IFF_PROMISC) &&
		    GEM_BFEXT(RX_CSUM, ctrl) & GEM_RX_CSUM_CHECKED_MASK)
			skb->ip_summed = CHECKSUM_UNNECESSARY;

		bp->dev->stats.rx_packets++;
		queue->stats.rx_packets++;
		bp->dev->stats.rx_bytes += skb->len;
		queue->stats.rx_bytes += skb->len;

		gem_ptp_do_rxstamp(bp, skb, desc);

#if defined(DEBUG) && defined(VERBOSE_DEBUG)
		netdev_vdbg(bp->dev, "received skb of length %u, csum: %08x\n",
			    skb->len, skb->csum);
		print_hex_dump(KERN_DEBUG, " mac: ", DUMP_PREFIX_ADDRESS, 16, 1,
			       skb_mac_header(skb), 16, true);
		print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_ADDRESS, 16, 1,
			       skb->data, 32, true);
#endif

		napi_gro_receive(napi, skb);
	}

	gem_rx_refill(queue);

	return count;
}

static int macb_rx_frame(struct macb_queue *queue, struct napi_struct *napi,
			 unsigned int first_frag, unsigned int last_frag)
{
	unsigned int len;
	unsigned int frag;
	unsigned int offset;
	struct sk_buff *skb;
	struct macb_dma_desc *desc;
	struct macb *bp = queue->bp;

	desc = macb_rx_desc(queue, last_frag);
	len = desc->ctrl & bp->rx_frm_len_mask;

	netdev_vdbg(bp->dev, "macb_rx_frame frags %u - %u (len %u)\n",
		macb_rx_ring_wrap(bp, first_frag),
		macb_rx_ring_wrap(bp, last_frag), len);

	/* The ethernet header starts NET_IP_ALIGN bytes into the
	 * first buffer. Since the header is 14 bytes, this makes the
	 * payload word-aligned.
	 *
	 * Instead of calling skb_reserve(NET_IP_ALIGN), we just copy
	 * the two padding bytes into the skb so that we avoid hitting
	 * the slowpath in memcpy(), and pull them off afterwards.
	 */
	skb = netdev_alloc_skb(bp->dev, len + NET_IP_ALIGN);
	if (!skb) {
		bp->dev->stats.rx_dropped++;
		for (frag = first_frag; ; frag++) {
			desc = macb_rx_desc(queue, frag);
			desc->addr &= ~MACB_BIT(RX_USED);
			if (frag == last_frag)
				break;
		}

		/* Make descriptor updates visible to hardware */
		wmb();

		return 1;
	}

	offset = 0;
	len += NET_IP_ALIGN;
	skb_checksum_none_assert(skb);
	skb_put(skb, len);

	for (frag = first_frag; ; frag++) {
		unsigned int frag_len = bp->rx_buffer_size;

		if (offset + frag_len > len) {
			if (unlikely(frag != last_frag)) {
				dev_kfree_skb_any(skb);
				return -1;
			}
			frag_len = len - offset;
		}
		skb_copy_to_linear_data_offset(skb, offset,
					       macb_rx_buffer(queue, frag),
					       frag_len);
		offset += bp->rx_buffer_size;
		desc = macb_rx_desc(queue, frag);
		desc->addr &= ~MACB_BIT(RX_USED);

		if (frag == last_frag)
			break;
	}

	/* Make descriptor updates visible to hardware */
	wmb();

	__skb_pull(skb, NET_IP_ALIGN);
	skb->protocol = eth_type_trans(skb, bp->dev);

	bp->dev->stats.rx_packets++;
	bp->dev->stats.rx_bytes += skb->len;
	netdev_vdbg(bp->dev, "received skb of length %u, csum: %08x\n",
		    skb->len, skb->csum);
	napi_gro_receive(napi, skb);

	return 0;
}

static inline void macb_init_rx_ring(struct macb_queue *queue)
{
	struct macb *bp = queue->bp;
	dma_addr_t addr;
	struct macb_dma_desc *desc = NULL;
	int i;

	addr = queue->rx_buffers_dma;
	for (i = 0; i < bp->rx_ring_size; i++) {
		desc = macb_rx_desc(queue, i);
		macb_set_addr(bp, desc, addr);
		desc->ctrl = 0;
		addr += bp->rx_buffer_size;
	}
	desc->addr |= MACB_BIT(RX_WRAP);
	queue->rx_tail = 0;
}

static int macb_rx(struct macb_queue *queue, struct napi_struct *napi,
		   int budget)
{
	struct macb *bp = queue->bp;
	bool reset_rx_queue = false;
	int received = 0;
	unsigned int tail;
	int first_frag = -1;

	for (tail = queue->rx_tail; budget > 0; tail++) {
		struct macb_dma_desc *desc = macb_rx_desc(queue, tail);
		u32 ctrl;

		/* Make hw descriptor updates visible to CPU */
		rmb();

		if (!(desc->addr & MACB_BIT(RX_USED)))
			break;

		/* Ensure ctrl is at least as up-to-date as addr */
		dma_rmb();

		ctrl = desc->ctrl;

		if (ctrl & MACB_BIT(RX_SOF)) {
			if (first_frag != -1)
				discard_partial_frame(queue, first_frag, tail);
			first_frag = tail;
		}

		if (ctrl & MACB_BIT(RX_EOF)) {
			int dropped;

			if (unlikely(first_frag == -1)) {
				reset_rx_queue = true;
				continue;
			}

			dropped = macb_rx_frame(queue, napi, first_frag, tail);
			first_frag = -1;
			if (unlikely(dropped < 0)) {
				reset_rx_queue = true;
				continue;
			}
			if (!dropped) {
				received++;
				budget--;
			}
		}
	}

	if (unlikely(reset_rx_queue)) {
		unsigned long flags;
		u32 ctrl;

		netdev_err(bp->dev, "RX queue corruption: reset it\n");

		spin_lock_irqsave(&bp->lock, flags);

		ctrl = macb_readl(bp, NCR);
		macb_writel(bp, NCR, ctrl & ~MACB_BIT(RE));

		macb_init_rx_ring(queue);
		queue_writel(queue, RBQP, queue->rx_ring_dma);

		macb_writel(bp, NCR, ctrl | MACB_BIT(RE));

		spin_unlock_irqrestore(&bp->lock, flags);
		return received;
	}

	if (first_frag != -1)
		queue->rx_tail = first_frag;
	else
		queue->rx_tail = tail;

	return received;
}

static int macb_poll(struct napi_struct *napi, int budget)
{
	struct macb_queue *queue = container_of(napi, struct macb_queue, napi);
	struct macb *bp = queue->bp;
	int work_done;
	u32 status;

	status = macb_readl(bp, RSR);
	macb_writel(bp, RSR, status);

	netdev_vdbg(bp->dev, "poll: status = %08lx, budget = %d\n",
		    (unsigned long)status, budget);

	work_done = bp->macbgem_ops.mog_rx(queue, napi, budget);
	if (work_done < budget) {
		napi_complete_done(napi, work_done);

		/* Packets received while interrupts were disabled */
		status = macb_readl(bp, RSR);
		if (status) {
			if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
				queue_writel(queue, ISR, MACB_BIT(RCOMP));
			napi_reschedule(napi);
		} else {
			queue_writel(queue, IER, bp->rx_intr_mask);
		}
	}

	/* TODO: Handle errors */

	return work_done;
}

static void macb_hresp_error_task(struct tasklet_struct *t)
{
	struct macb *bp = from_tasklet(bp, t, hresp_err_tasklet);
	struct net_device *dev = bp->dev;
	struct macb_queue *queue;
	unsigned int q;
	u32 ctrl;

	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
		queue_writel(queue, IDR, bp->rx_intr_mask |
					 MACB_TX_INT_FLAGS |
					 MACB_BIT(HRESP));
	}
	ctrl = macb_readl(bp, NCR);
	ctrl &= ~(MACB_BIT(RE) | MACB_BIT(TE));
	macb_writel(bp, NCR, ctrl);

	netif_tx_stop_all_queues(dev);
	netif_carrier_off(dev);

	bp->macbgem_ops.mog_init_rings(bp);

	/* Initialize TX and RX buffers */
	macb_init_buffers(bp);

	/* Enable interrupts */
	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue)
		queue_writel(queue, IER,
			     bp->rx_intr_mask |
			     MACB_TX_INT_FLAGS |
			     MACB_BIT(HRESP));

	ctrl |= MACB_BIT(RE) | MACB_BIT(TE);
	macb_writel(bp, NCR, ctrl);

	netif_carrier_on(dev);
	netif_tx_start_all_queues(dev);
}

static void macb_tx_restart(struct macb_queue *queue)
{
	unsigned int head = queue->tx_head;
	unsigned int tail = queue->tx_tail;
	struct macb *bp = queue->bp;

	if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
		queue_writel(queue, ISR, MACB_BIT(TXUBR));

	if (head == tail)
		return;

	macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));
}

static irqreturn_t macb_wol_interrupt(int irq, void *dev_id)
{
	struct macb_queue *queue = dev_id;
	struct macb *bp = queue->bp;
	u32 status;

	status = queue_readl(queue, ISR);

	if (unlikely(!status))
		return IRQ_NONE;

	spin_lock(&bp->lock);

	if (status & MACB_BIT(WOL)) {
		queue_writel(queue, IDR, MACB_BIT(WOL));
		macb_writel(bp, WOL, 0);
		netdev_vdbg(bp->dev, "MACB WoL: queue = %u, isr = 0x%08lx\n",
			    (unsigned int)(queue - bp->queues),
			    (unsigned long)status);
		if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
			queue_writel(queue, ISR, MACB_BIT(WOL));
		pm_wakeup_event(&bp->pdev->dev, 0);
	}

	spin_unlock(&bp->lock);

	return IRQ_HANDLED;
}

static irqreturn_t gem_wol_interrupt(int irq, void *dev_id)
{
	struct macb_queue *queue = dev_id;
	struct macb *bp = queue->bp;
	u32 status;

	status = queue_readl(queue, ISR);

	if (unlikely(!status))
		return IRQ_NONE;

	spin_lock(&bp->lock);

	if (status & GEM_BIT(WOL)) {
		queue_writel(queue, IDR, GEM_BIT(WOL));
		gem_writel(bp, WOL, 0);
		netdev_vdbg(bp->dev, "GEM WoL: queue = %u, isr = 0x%08lx\n",
			    (unsigned int)(queue - bp->queues),
			    (unsigned long)status);
		if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
			queue_writel(queue, ISR, GEM_BIT(WOL));
		pm_wakeup_event(&bp->pdev->dev, 0);
	}

	spin_unlock(&bp->lock);

	return IRQ_HANDLED;
}

static irqreturn_t macb_interrupt(int irq, void *dev_id)
{
	struct macb_queue *queue = dev_id;
	struct macb *bp = queue->bp;
	struct net_device *dev = bp->dev;
	u32 status, ctrl;

	status = queue_readl(queue, ISR);

	if (unlikely(!status))
		return IRQ_NONE;

	spin_lock(&bp->lock);

	while (status) {
		/* close possible race with dev_close */
		if (unlikely(!netif_running(dev))) {
			queue_writel(queue, IDR, -1);
			if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
				queue_writel(queue, ISR, -1);
			break;
		}

		netdev_vdbg(bp->dev, "queue = %u, isr = 0x%08lx\n",
			    (unsigned int)(queue - bp->queues),
			    (unsigned long)status);

		if (status & bp->rx_intr_mask) {
			/* There's no point taking any more interrupts
			 * until we have processed the buffers. The
			 * scheduling call may fail if the poll routine
			 * is already scheduled, so disable interrupts
			 * now.
			 */
			queue_writel(queue, IDR, bp->rx_intr_mask);
			if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
				queue_writel(queue, ISR, MACB_BIT(RCOMP));

			if (napi_schedule_prep(&queue->napi)) {
				netdev_vdbg(bp->dev, "scheduling RX softirq\n");
				__napi_schedule(&queue->napi);
			}
		}

		if (unlikely(status & (MACB_TX_ERR_FLAGS))) {
			queue_writel(queue, IDR, MACB_TX_INT_FLAGS);
			schedule_work(&queue->tx_error_task);

			if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
				queue_writel(queue, ISR, MACB_TX_ERR_FLAGS);

			break;
		}

		if (status & MACB_BIT(TCOMP))
			macb_tx_interrupt(queue);

		if (status & MACB_BIT(TXUBR))
			macb_tx_restart(queue);

		/* Link change detection isn't possible with RMII, so we'll
		 * add that if/when we get our hands on a full-blown MII PHY.
		 */

		/* There is a hardware issue under heavy load where DMA can
		 * stop, this causes endless "used buffer descriptor read"
		 * interrupts but it can be cleared by re-enabling RX. See
		 * the at91rm9200 manual, section 41.3.1 or the Zynq manual
		 * section 16.7.4 for details. RXUBR is only enabled for
		 * these two versions.
		 */
		if (status & MACB_BIT(RXUBR)) {
			ctrl = macb_readl(bp, NCR);
			macb_writel(bp, NCR, ctrl & ~MACB_BIT(RE));
			wmb();
			macb_writel(bp, NCR, ctrl | MACB_BIT(RE));

			if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
				queue_writel(queue, ISR, MACB_BIT(RXUBR));
		}

		if (status & MACB_BIT(ISR_ROVR)) {
			/* We missed at least one packet */
			if (macb_is_gem(bp))
				bp->hw_stats.gem.rx_overruns++;
			else
				bp->hw_stats.macb.rx_overruns++;

			if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
				queue_writel(queue, ISR, MACB_BIT(ISR_ROVR));
		}

		if (status & MACB_BIT(HRESP)) {
			tasklet_schedule(&bp->hresp_err_tasklet);
			netdev_err(dev, "DMA bus error: HRESP not OK\n");

			if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
				queue_writel(queue, ISR, MACB_BIT(HRESP));
		}
		status = queue_readl(queue, ISR);
	}

	spin_unlock(&bp->lock);

	return IRQ_HANDLED;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
/* Polling receive - used by netconsole and other diagnostic tools
 * to allow network i/o with interrupts disabled.
 */
static void macb_poll_controller(struct net_device *dev)
{
	struct macb *bp = netdev_priv(dev);
	struct macb_queue *queue;
	unsigned long flags;
	unsigned int q;

	local_irq_save(flags);
	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue)
		macb_interrupt(dev->irq, queue);
	local_irq_restore(flags);
}
#endif

static unsigned int macb_tx_map(struct macb *bp,
				struct macb_queue *queue,
				struct sk_buff *skb,
				unsigned int hdrlen)
{
	dma_addr_t mapping;
	unsigned int len, entry, i, tx_head = queue->tx_head;
	struct macb_tx_skb *tx_skb = NULL;
	struct macb_dma_desc *desc;
	unsigned int offset, size, count = 0;
	unsigned int f, nr_frags = skb_shinfo(skb)->nr_frags;
	unsigned int eof = 1, mss_mfs = 0;
	u32 ctrl, lso_ctrl = 0, seq_ctrl = 0;

	/* LSO */
	if (skb_shinfo(skb)->gso_size != 0) {
		if (ip_hdr(skb)->protocol == IPPROTO_UDP)
			/* UDP - UFO */
			lso_ctrl = MACB_LSO_UFO_ENABLE;
		else
			/* TCP - TSO */
			lso_ctrl = MACB_LSO_TSO_ENABLE;
	}

	/* First, map non-paged data */
	len = skb_headlen(skb);

	/* first buffer length */
	size = hdrlen;

	offset = 0;
	while (len) {
		entry = macb_tx_ring_wrap(bp, tx_head);
		tx_skb = &queue->tx_skb[entry];

		mapping = dma_map_single(&bp->pdev->dev,
					 skb->data + offset,
					 size, DMA_TO_DEVICE);
		if (dma_mapping_error(&bp->pdev->dev, mapping))
			goto dma_error;

		/* Save info to properly release resources */
		tx_skb->skb = NULL;
		tx_skb->mapping = mapping;
		tx_skb->size = size;
		tx_skb->mapped_as_page = false;

		len -= size;
		offset += size;
		count++;
		tx_head++;

		size = min(len, bp->max_tx_length);
	}

	/* Then, map paged data from fragments */
	for (f = 0; f < nr_frags; f++) {
		const skb_frag_t *frag = &skb_shinfo(skb)->frags[f];

		len = skb_frag_size(frag);
		offset = 0;
		while (len) {
			size = min(len, bp->max_tx_length);
			entry = macb_tx_ring_wrap(bp, tx_head);
			tx_skb = &queue->tx_skb[entry];

			mapping = skb_frag_dma_map(&bp->pdev->dev, frag,
						   offset, size, DMA_TO_DEVICE);
			if (dma_mapping_error(&bp->pdev->dev, mapping))
				goto dma_error;

			/* Save info to properly release resources */
			tx_skb->skb = NULL;
			tx_skb->mapping = mapping;
			tx_skb->size = size;
			tx_skb->mapped_as_page = true;

			len -= size;
			offset += size;
			count++;
			tx_head++;
		}
	}

	/* Should never happen */
	if (unlikely(!tx_skb)) {
		netdev_err(bp->dev, "BUG! empty skb!\n");
		return 0;
	}

	/* This is the last buffer of the frame: save socket buffer */
	tx_skb->skb = skb;

	/* Update TX ring: update buffer descriptors in reverse order
	 * to avoid race condition
	 */

	/* Set 'TX_USED' bit in buffer descriptor at tx_head position
	 * to set the end of TX queue
	 */
	i = tx_head;
	entry = macb_tx_ring_wrap(bp, i);
	ctrl = MACB_BIT(TX_USED);
	desc = macb_tx_desc(queue, entry);
	desc->ctrl = ctrl;

	if (lso_ctrl) {
		if (lso_ctrl == MACB_LSO_UFO_ENABLE)
			/* include header and FCS in value given to h/w */
			mss_mfs = skb_shinfo(skb)->gso_size +
					skb_transport_offset(skb) +
					ETH_FCS_LEN;
		else /* TSO */ {
			mss_mfs = skb_shinfo(skb)->gso_size;
			/* TCP Sequence Number Source Select
			 * can be set only for TSO
			 */
			seq_ctrl = 0;
		}
	}

	do {
		i--;
		entry = macb_tx_ring_wrap(bp, i);
		tx_skb = &queue->tx_skb[entry];
		desc = macb_tx_desc(queue, entry);

		ctrl = (u32)tx_skb->size;
		if (eof) {
			ctrl |= MACB_BIT(TX_LAST);
			eof = 0;
		}
		if (unlikely(entry == (bp->tx_ring_size - 1)))
			ctrl |= MACB_BIT(TX_WRAP);

		/* First descriptor is header descriptor */
		if (i == queue->tx_head) {
			ctrl |= MACB_BF(TX_LSO, lso_ctrl);
			ctrl |= MACB_BF(TX_TCP_SEQ_SRC, seq_ctrl);
			if ((bp->dev->features & NETIF_F_HW_CSUM) &&
			    skb->ip_summed != CHECKSUM_PARTIAL && !lso_ctrl)
				ctrl |= MACB_BIT(TX_NOCRC);
		} else
			/* Only set MSS/MFS on payload descriptors
			 * (second or later descriptor)
			 */
			ctrl |= MACB_BF(MSS_MFS, mss_mfs);

		/* Set TX buffer descriptor */
		macb_set_addr(bp, desc, tx_skb->mapping);
		/* desc->addr must be visible to hardware before clearing
		 * 'TX_USED' bit in desc->ctrl.
		 */
		wmb();
		desc->ctrl = ctrl;
	} while (i != queue->tx_head);

	queue->tx_head = tx_head;

	return count;

dma_error:
	netdev_err(bp->dev, "TX DMA map failed\n");

	for (i = queue->tx_head; i != tx_head; i++) {
		tx_skb = macb_tx_skb(queue, i);

		macb_tx_unmap(bp, tx_skb);
	}

	return 0;
}

static netdev_features_t macb_features_check(struct sk_buff *skb,
					     struct net_device *dev,
					     netdev_features_t features)
{
	unsigned int nr_frags, f;
	unsigned int hdrlen;

	/* Validate LSO compatibility */

	/* there is only one buffer or protocol is not UDP */
	if (!skb_is_nonlinear(skb) || (ip_hdr(skb)->protocol != IPPROTO_UDP))
		return features;

	/* length of header */
	hdrlen = skb_transport_offset(skb);

	/* For UFO only:
	 * When software supplies two or more payload buffers all payload buffers
	 * apart from the last must be a multiple of 8 bytes in size.
	 */
	if (!IS_ALIGNED(skb_headlen(skb) - hdrlen, MACB_TX_LEN_ALIGN))
		return features & ~MACB_NETIF_LSO;

	nr_frags = skb_shinfo(skb)->nr_frags;
	/* No need to check last fragment */
	nr_frags--;
	for (f = 0; f < nr_frags; f++) {
		const skb_frag_t *frag = &skb_shinfo(skb)->frags[f];

		if (!IS_ALIGNED(skb_frag_size(frag), MACB_TX_LEN_ALIGN))
			return features & ~MACB_NETIF_LSO;
	}
	return features;
}

static inline int macb_clear_csum(struct sk_buff *skb)
{
	/* no change for packets without checksum offloading */
	if (skb->ip_summed != CHECKSUM_PARTIAL)
		return 0;

	/* make sure we can modify the header */
	if (unlikely(skb_cow_head(skb, 0)))
		return -1;

	/* initialize checksum field
	 * This is required - at least for Zynq, which otherwise calculates
	 * wrong UDP header checksums for UDP packets with UDP data len <=2
	 */
	*(__sum16 *)(skb_checksum_start(skb) + skb->csum_offset) = 0;
	return 0;
}

static int macb_pad_and_fcs(struct sk_buff **skb, struct net_device *ndev)
{
	bool cloned = skb_cloned(*skb) || skb_header_cloned(*skb) ||
		      skb_is_nonlinear(*skb);
	int padlen = ETH_ZLEN - (*skb)->len;
	int headroom = skb_headroom(*skb);
	int tailroom = skb_tailroom(*skb);
	struct sk_buff *nskb;
	u32 fcs;

	if (!(ndev->features & NETIF_F_HW_CSUM) ||
	    !((*skb)->ip_summed != CHECKSUM_PARTIAL) ||
	    skb_shinfo(*skb)->gso_size)	/* Not available for GSO */
		return 0;

	if (padlen <= 0) {
		/* FCS could be appeded to tailroom. */
		if (tailroom >= ETH_FCS_LEN)
			goto add_fcs;
		/* FCS could be appeded by moving data to headroom. */
		else if (!cloned && headroom + tailroom >= ETH_FCS_LEN)
			padlen = 0;
		/* No room for FCS, need to reallocate skb. */
		else
			padlen = ETH_FCS_LEN;
	} else {
		/* Add room for FCS. */
		padlen += ETH_FCS_LEN;
	}

	if (!cloned && headroom + tailroom >= padlen) {
		(*skb)->data = memmove((*skb)->head, (*skb)->data, (*skb)->len);
		skb_set_tail_pointer(*skb, (*skb)->len);
	} else {
		nskb = skb_copy_expand(*skb, 0, padlen, GFP_ATOMIC);
		if (!nskb)
			return -ENOMEM;

		dev_consume_skb_any(*skb);
		*skb = nskb;
	}

	if (padlen > ETH_FCS_LEN)
		skb_put_zero(*skb, padlen - ETH_FCS_LEN);

add_fcs:
	/* set FCS to packet */
	fcs = crc32_le(~0, (*skb)->data, (*skb)->len);
	fcs = ~fcs;

	skb_put_u8(*skb, fcs		& 0xff);
	skb_put_u8(*skb, (fcs >> 8)	& 0xff);
	skb_put_u8(*skb, (fcs >> 16)	& 0xff);
	skb_put_u8(*skb, (fcs >> 24)	& 0xff);

	return 0;
}

static netdev_tx_t macb_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	u16 queue_index = skb_get_queue_mapping(skb);
	struct macb *bp = netdev_priv(dev);
	struct macb_queue *queue = &bp->queues[queue_index];
	unsigned long flags;
	unsigned int desc_cnt, nr_frags, frag_size, f;
	unsigned int hdrlen;
	bool is_lso;
	netdev_tx_t ret = NETDEV_TX_OK;

	if (macb_clear_csum(skb)) {
		dev_kfree_skb_any(skb);
		return ret;
	}

	if (macb_pad_and_fcs(&skb, dev)) {
		dev_kfree_skb_any(skb);
		return ret;
	}

	is_lso = (skb_shinfo(skb)->gso_size != 0);

	if (is_lso) {
		/* length of headers */
		if (ip_hdr(skb)->protocol == IPPROTO_UDP)
			/* only queue eth + ip headers separately for UDP */
			hdrlen = skb_transport_offset(skb);
		else
			hdrlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
		if (skb_headlen(skb) < hdrlen) {
			netdev_err(bp->dev, "Error - LSO headers fragmented!!!\n");
			/* if this is required, would need to copy to single buffer */
			return NETDEV_TX_BUSY;
		}
	} else
		hdrlen = min(skb_headlen(skb), bp->max_tx_length);

#if defined(DEBUG) && defined(VERBOSE_DEBUG)
	netdev_vdbg(bp->dev,
		    "start_xmit: queue %hu len %u head %p data %p tail %p end %p\n",
		    queue_index, skb->len, skb->head, skb->data,
		    skb_tail_pointer(skb), skb_end_pointer(skb));
	print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_OFFSET, 16, 1,
		       skb->data, 16, true);
#endif

	/* Count how many TX buffer descriptors are needed to send this
	 * socket buffer: skb fragments of jumbo frames may need to be
	 * split into many buffer descriptors.
	 */
	if (is_lso && (skb_headlen(skb) > hdrlen))
		/* extra header descriptor if also payload in first buffer */
		desc_cnt = DIV_ROUND_UP((skb_headlen(skb) - hdrlen), bp->max_tx_length) + 1;
	else
		desc_cnt = DIV_ROUND_UP(skb_headlen(skb), bp->max_tx_length);
	nr_frags = skb_shinfo(skb)->nr_frags;
	for (f = 0; f < nr_frags; f++) {
		frag_size = skb_frag_size(&skb_shinfo(skb)->frags[f]);
		desc_cnt += DIV_ROUND_UP(frag_size, bp->max_tx_length);
	}

	spin_lock_irqsave(&bp->lock, flags);

	/* This is a hard error, log it. */
	if (CIRC_SPACE(queue->tx_head, queue->tx_tail,
		       bp->tx_ring_size) < desc_cnt) {
		netif_stop_subqueue(dev, queue_index);
		spin_unlock_irqrestore(&bp->lock, flags);
		netdev_dbg(bp->dev, "tx_head = %u, tx_tail = %u\n",
			   queue->tx_head, queue->tx_tail);
		return NETDEV_TX_BUSY;
	}

	/* Map socket buffer for DMA transfer */
	if (!macb_tx_map(bp, queue, skb, hdrlen)) {
		dev_kfree_skb_any(skb);
		goto unlock;
	}

	/* Make newly initialized descriptor visible to hardware */
	wmb();
	skb_tx_timestamp(skb);

	macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));

	if (CIRC_SPACE(queue->tx_head, queue->tx_tail, bp->tx_ring_size) < 1)
		netif_stop_subqueue(dev, queue_index);

unlock:
	spin_unlock_irqrestore(&bp->lock, flags);

	return ret;
}

static void macb_init_rx_buffer_size(struct macb *bp, size_t size)
{
	if (!macb_is_gem(bp)) {
		bp->rx_buffer_size = MACB_RX_BUFFER_SIZE;
	} else {
		bp->rx_buffer_size = size;

		if (bp->rx_buffer_size % RX_BUFFER_MULTIPLE) {
			netdev_dbg(bp->dev,
				   "RX buffer must be multiple of %d bytes, expanding\n",
				   RX_BUFFER_MULTIPLE);
			bp->rx_buffer_size =
				roundup(bp->rx_buffer_size, RX_BUFFER_MULTIPLE);
		}
	}

	netdev_dbg(bp->dev, "mtu [%u] rx_buffer_size [%zu]\n",
		   bp->dev->mtu, bp->rx_buffer_size);
}

static void gem_free_rx_buffers(struct macb *bp)
{
	struct sk_buff		*skb;
	struct macb_dma_desc	*desc;
	struct macb_queue *queue;
	dma_addr_t		addr;
	unsigned int q;
	int i;

	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
		if (!queue->rx_skbuff)
			continue;

		for (i = 0; i < bp->rx_ring_size; i++) {
			skb = queue->rx_skbuff[i];

			if (!skb)
				continue;

			desc = macb_rx_desc(queue, i);
			addr = macb_get_addr(bp, desc);

			dma_unmap_single(&bp->pdev->dev, addr, bp->rx_buffer_size,
					DMA_FROM_DEVICE);
			dev_kfree_skb_any(skb);
			skb = NULL;
		}

		kfree(queue->rx_skbuff);
		queue->rx_skbuff = NULL;
	}
}

static void macb_free_rx_buffers(struct macb *bp)
{
	struct macb_queue *queue = &bp->queues[0];

	if (queue->rx_buffers) {
		dma_free_coherent(&bp->pdev->dev,
				  bp->rx_ring_size * bp->rx_buffer_size,
				  queue->rx_buffers, queue->rx_buffers_dma);
		queue->rx_buffers = NULL;
	}
}

static void macb_free_consistent(struct macb *bp)
{
	struct macb_queue *queue;
	unsigned int q;
	int size;

	bp->macbgem_ops.mog_free_rx_buffers(bp);

	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
		kfree(queue->tx_skb);
		queue->tx_skb = NULL;
		if (queue->tx_ring) {
			size = TX_RING_BYTES(bp) + bp->tx_bd_rd_prefetch;
			dma_free_coherent(&bp->pdev->dev, size,
					  queue->tx_ring, queue->tx_ring_dma);
			queue->tx_ring = NULL;
		}
		if (queue->rx_ring) {
			size = RX_RING_BYTES(bp) + bp->rx_bd_rd_prefetch;
			dma_free_coherent(&bp->pdev->dev, size,
					  queue->rx_ring, queue->rx_ring_dma);
			queue->rx_ring = NULL;
		}
	}
}

static int gem_alloc_rx_buffers(struct macb *bp)
{
	struct macb_queue *queue;
	unsigned int q;
	int size;

	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
		size = bp->rx_ring_size * sizeof(struct sk_buff *);
		queue->rx_skbuff = kzalloc(size, GFP_KERNEL);
		if (!queue->rx_skbuff)
			return -ENOMEM;
		else
			netdev_dbg(bp->dev,
				   "Allocated %d RX struct sk_buff entries at %p\n",
				   bp->rx_ring_size, queue->rx_skbuff);
	}
	return 0;
}

static int macb_alloc_rx_buffers(struct macb *bp)
{
	struct macb_queue *queue = &bp->queues[0];
	int size;

	size = bp->rx_ring_size * bp->rx_buffer_size;
	queue->rx_buffers = dma_alloc_coherent(&bp->pdev->dev, size,
					    &queue->rx_buffers_dma, GFP_KERNEL);
	if (!queue->rx_buffers)
		return -ENOMEM;

	netdev_dbg(bp->dev,
		   "Allocated RX buffers of %d bytes at %08lx (mapped %p)\n",
		   size, (unsigned long)queue->rx_buffers_dma, queue->rx_buffers);
	return 0;
}

static int macb_alloc_consistent(struct macb *bp)
{
	struct macb_queue *queue;
	unsigned int q;
	int size;

	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
		size = TX_RING_BYTES(bp) + bp->tx_bd_rd_prefetch;
		queue->tx_ring = dma_alloc_coherent(&bp->pdev->dev, size,
						    &queue->tx_ring_dma,
						    GFP_KERNEL);
		if (!queue->tx_ring)
			goto out_err;
		netdev_dbg(bp->dev,
			   "Allocated TX ring for queue %u of %d bytes at %08lx (mapped %p)\n",
			   q, size, (unsigned long)queue->tx_ring_dma,
			   queue->tx_ring);

		size = bp->tx_ring_size * sizeof(struct macb_tx_skb);
		queue->tx_skb = kmalloc(size, GFP_KERNEL);
		if (!queue->tx_skb)
			goto out_err;

		size = RX_RING_BYTES(bp) + bp->rx_bd_rd_prefetch;
		queue->rx_ring = dma_alloc_coherent(&bp->pdev->dev, size,
						 &queue->rx_ring_dma, GFP_KERNEL);
		if (!queue->rx_ring)
			goto out_err;
		netdev_dbg(bp->dev,
			   "Allocated RX ring of %d bytes at %08lx (mapped %p)\n",
			   size, (unsigned long)queue->rx_ring_dma, queue->rx_ring);
	}
	if (bp->macbgem_ops.mog_alloc_rx_buffers(bp))
		goto out_err;

	return 0;

out_err:
	macb_free_consistent(bp);
	return -ENOMEM;
}

static void gem_init_rings(struct macb *bp)
{
	struct macb_queue *queue;
	struct macb_dma_desc *desc = NULL;
	unsigned int q;
	int i;

	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
		for (i = 0; i < bp->tx_ring_size; i++) {
			desc = macb_tx_desc(queue, i);
			macb_set_addr(bp, desc, 0);
			desc->ctrl = MACB_BIT(TX_USED);
		}
		desc->ctrl |= MACB_BIT(TX_WRAP);
		queue->tx_head = 0;
		queue->tx_tail = 0;

		queue->rx_tail = 0;
		queue->rx_prepared_head = 0;

		gem_rx_refill(queue);
	}

}

static void macb_init_rings(struct macb *bp)
{
	int i;
	struct macb_dma_desc *desc = NULL;

	macb_init_rx_ring(&bp->queues[0]);

	for (i = 0; i < bp->tx_ring_size; i++) {
		desc = macb_tx_desc(&bp->queues[0], i);
		macb_set_addr(bp, desc, 0);
		desc->ctrl = MACB_BIT(TX_USED);
	}
	bp->queues[0].tx_head = 0;
	bp->queues[0].tx_tail = 0;
	desc->ctrl |= MACB_BIT(TX_WRAP);
}

static void macb_reset_hw(struct macb *bp)
{
	struct macb_queue *queue;
	unsigned int q;
	u32 ctrl = macb_readl(bp, NCR);

	/* Disable RX and TX (XXX: Should we halt the transmission
	 * more gracefully?)
	 */
	ctrl &= ~(MACB_BIT(RE) | MACB_BIT(TE));

	/* Clear the stats registers (XXX: Update stats first?) */
	ctrl |= MACB_BIT(CLRSTAT);

	macb_writel(bp, NCR, ctrl);

	/* Clear all status flags */
	macb_writel(bp, TSR, -1);
	macb_writel(bp, RSR, -1);

	/* Disable all interrupts */
	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
		queue_writel(queue, IDR, -1);
		queue_readl(queue, ISR);
		if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
			queue_writel(queue, ISR, -1);
	}
}

static u32 gem_mdc_clk_div(struct macb *bp)
{
	u32 config;
	unsigned long pclk_hz = clk_get_rate(bp->pclk);

	if (pclk_hz <= 20000000)
		config = GEM_BF(CLK, GEM_CLK_DIV8);
	else if (pclk_hz <= 40000000)
		config = GEM_BF(CLK, GEM_CLK_DIV16);
	else if (pclk_hz <= 80000000)
		config = GEM_BF(CLK, GEM_CLK_DIV32);
	else if (pclk_hz <= 120000000)
		config = GEM_BF(CLK, GEM_CLK_DIV48);
	else if (pclk_hz <= 160000000)
		config = GEM_BF(CLK, GEM_CLK_DIV64);
	else
		config = GEM_BF(CLK, GEM_CLK_DIV96);

	return config;
}

static u32 macb_mdc_clk_div(struct macb *bp)
{
	u32 config;
	unsigned long pclk_hz;

	if (macb_is_gem(bp))
		return gem_mdc_clk_div(bp);

	pclk_hz = clk_get_rate(bp->pclk);
	if (pclk_hz <= 20000000)
		config = MACB_BF(CLK, MACB_CLK_DIV8);
	else if (pclk_hz <= 40000000)
		config = MACB_BF(CLK, MACB_CLK_DIV16);
	else if (pclk_hz <= 80000000)
		config = MACB_BF(CLK, MACB_CLK_DIV32);
	else
		config = MACB_BF(CLK, MACB_CLK_DIV64);

	return config;
}

/* Get the DMA bus width field of the network configuration register that we
 * should program.  We find the width from decoding the design configuration
 * register to find the maximum supported data bus width.
 */
static u32 macb_dbw(struct macb *bp)
{
	if (!macb_is_gem(bp))
		return 0;

	switch (GEM_BFEXT(DBWDEF, gem_readl(bp, DCFG1))) {
	case 4:
		return GEM_BF(DBW, GEM_DBW128);
	case 2:
		return GEM_BF(DBW, GEM_DBW64);
	case 1:
	default:
		return GEM_BF(DBW, GEM_DBW32);
	}
}

/* Configure the receive DMA engine
 * - use the correct receive buffer size
 * - set best burst length for DMA operations
 *   (if not supported by FIFO, it will fallback to default)
 * - set both rx/tx packet buffers to full memory size
 * These are configurable parameters for GEM.
 */
static void macb_configure_dma(struct macb *bp)
{
	struct macb_queue *queue;
	u32 buffer_size;
	unsigned int q;
	u32 dmacfg;

	buffer_size = bp->rx_buffer_size / RX_BUFFER_MULTIPLE;
	if (macb_is_gem(bp)) {
		dmacfg = gem_readl(bp, DMACFG) & ~GEM_BF(RXBS, -1L);
		for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
			if (q)
				queue_writel(queue, RBQS, buffer_size);
			else
				dmacfg |= GEM_BF(RXBS, buffer_size);
		}
		if (bp->dma_burst_length)
			dmacfg = GEM_BFINS(FBLDO, bp->dma_burst_length, dmacfg);
		dmacfg |= GEM_BIT(TXPBMS) | GEM_BF(RXBMS, -1L);
		dmacfg &= ~GEM_BIT(ENDIA_PKT);

		if (bp->native_io)
			dmacfg &= ~GEM_BIT(ENDIA_DESC);
		else
			dmacfg |= GEM_BIT(ENDIA_DESC); /* CPU in big endian */

		if (bp->dev->features & NETIF_F_HW_CSUM)
			dmacfg |= GEM_BIT(TXCOEN);
		else
			dmacfg &= ~GEM_BIT(TXCOEN);

		dmacfg &= ~GEM_BIT(ADDR64);
#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
		if (bp->hw_dma_cap & HW_DMA_CAP_64B)
			dmacfg |= GEM_BIT(ADDR64);
#endif
#ifdef CONFIG_MACB_USE_HWSTAMP
		if (bp->hw_dma_cap & HW_DMA_CAP_PTP)
			dmacfg |= GEM_BIT(RXEXT) | GEM_BIT(TXEXT);
#endif
		netdev_dbg(bp->dev, "Cadence configure DMA with 0x%08x\n",
			   dmacfg);
		gem_writel(bp, DMACFG, dmacfg);
	}
}

static void macb_init_hw(struct macb *bp)
{
	u32 config;

	macb_reset_hw(bp);
	macb_set_hwaddr(bp);

	config = macb_mdc_clk_div(bp);
	config |= MACB_BF(RBOF, NET_IP_ALIGN);	/* Make eth data aligned */
	config |= MACB_BIT(DRFCS);		/* Discard Rx FCS */
	if (bp->caps & MACB_CAPS_JUMBO)
		config |= MACB_BIT(JFRAME);	/* Enable jumbo frames */
	else
		config |= MACB_BIT(BIG);	/* Receive oversized frames */
	if (bp->dev->flags & IFF_PROMISC)
		config |= MACB_BIT(CAF);	/* Copy All Frames */
	else if (macb_is_gem(bp) && bp->dev->features & NETIF_F_RXCSUM)
		config |= GEM_BIT(RXCOEN);
	if (!(bp->dev->flags & IFF_BROADCAST))
		config |= MACB_BIT(NBC);	/* No BroadCast */
	config |= macb_dbw(bp);
	macb_writel(bp, NCFGR, config);
	if ((bp->caps & MACB_CAPS_JUMBO) && bp->jumbo_max_len)
		gem_writel(bp, JML, bp->jumbo_max_len);
	bp->rx_frm_len_mask = MACB_RX_FRMLEN_MASK;
	if (bp->caps & MACB_CAPS_JUMBO)
		bp->rx_frm_len_mask = MACB_RX_JFRMLEN_MASK;

	macb_configure_dma(bp);
}

/* The hash address register is 64 bits long and takes up two
 * locations in the memory map.  The least significant bits are stored
 * in EMAC_HSL and the most significant bits in EMAC_HSH.
 *
 * The unicast hash enable and the multicast hash enable bits in the
 * network configuration register enable the reception of hash matched
 * frames. The destination address is reduced to a 6 bit index into
 * the 64 bit hash register using the following hash function.  The
 * hash function is an exclusive or of every sixth bit of the
 * destination address.
 *
 * hi[5] = da[5] ^ da[11] ^ da[17] ^ da[23] ^ da[29] ^ da[35] ^ da[41] ^ da[47]
 * hi[4] = da[4] ^ da[10] ^ da[16] ^ da[22] ^ da[28] ^ da[34] ^ da[40] ^ da[46]
 * hi[3] = da[3] ^ da[09] ^ da[15] ^ da[21] ^ da[27] ^ da[33] ^ da[39] ^ da[45]
 * hi[2] = da[2] ^ da[08] ^ da[14] ^ da[20] ^ da[26] ^ da[32] ^ da[38] ^ da[44]
 * hi[1] = da[1] ^ da[07] ^ da[13] ^ da[19] ^ da[25] ^ da[31] ^ da[37] ^ da[43]
 * hi[0] = da[0] ^ da[06] ^ da[12] ^ da[18] ^ da[24] ^ da[30] ^ da[36] ^ da[42]
 *
 * da[0] represents the least significant bit of the first byte
 * received, that is, the multicast/unicast indicator, and da[47]
 * represents the most significant bit of the last byte received.  If
 * the hash index, hi[n], points to a bit that is set in the hash
 * register then the frame will be matched according to whether the
 * frame is multicast or unicast.  A multicast match will be signalled
 * if the multicast hash enable bit is set, da[0] is 1 and the hash
 * index points to a bit set in the hash register.  A unicast match
 * will be signalled if the unicast hash enable bit is set, da[0] is 0
 * and the hash index points to a bit set in the hash register.  To
 * receive all multicast frames, the hash register should be set with
 * all ones and the multicast hash enable bit should be set in the
 * network configuration register.
 */

static inline int hash_bit_value(int bitnr, __u8 *addr)
{
	if (addr[bitnr / 8] & (1 << (bitnr % 8)))
		return 1;
	return 0;
}

/* Return the hash index value for the specified address. */
static int hash_get_index(__u8 *addr)
{
	int i, j, bitval;
	int hash_index = 0;

	for (j = 0; j < 6; j++) {
		for (i = 0, bitval = 0; i < 8; i++)
			bitval ^= hash_bit_value(i * 6 + j, addr);

		hash_index |= (bitval << j);
	}

	return hash_index;
}

/* Add multicast addresses to the internal multicast-hash table. */
static void macb_sethashtable(struct net_device *dev)
{
	struct netdev_hw_addr *ha;
	unsigned long mc_filter[2];
	unsigned int bitnr;
	struct macb *bp = netdev_priv(dev);

	mc_filter[0] = 0;
	mc_filter[1] = 0;

	netdev_for_each_mc_addr(ha, dev) {
		bitnr = hash_get_index(ha->addr);
		mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
	}

	macb_or_gem_writel(bp, HRB, mc_filter[0]);
	macb_or_gem_writel(bp, HRT, mc_filter[1]);
}

/* Enable/Disable promiscuous and multicast modes. */
static void macb_set_rx_mode(struct net_device *dev)
{
	unsigned long cfg;
	struct macb *bp = netdev_priv(dev);

	cfg = macb_readl(bp, NCFGR);

	if (dev->flags & IFF_PROMISC) {
		/* Enable promiscuous mode */
		cfg |= MACB_BIT(CAF);

		/* Disable RX checksum offload */
		if (macb_is_gem(bp))
			cfg &= ~GEM_BIT(RXCOEN);
	} else {
		/* Disable promiscuous mode */
		cfg &= ~MACB_BIT(CAF);

		/* Enable RX checksum offload only if requested */
		if (macb_is_gem(bp) && dev->features & NETIF_F_RXCSUM)
			cfg |= GEM_BIT(RXCOEN);
	}

	if (dev->flags & IFF_ALLMULTI) {
		/* Enable all multicast mode */
		macb_or_gem_writel(bp, HRB, -1);
		macb_or_gem_writel(bp, HRT, -1);
		cfg |= MACB_BIT(NCFGR_MTI);
	} else if (!netdev_mc_empty(dev)) {
		/* Enable specific multicasts */
		macb_sethashtable(dev);
		cfg |= MACB_BIT(NCFGR_MTI);
	} else if (dev->flags & (~IFF_ALLMULTI)) {
		/* Disable all multicast mode */
		macb_or_gem_writel(bp, HRB, 0);
		macb_or_gem_writel(bp, HRT, 0);
		cfg &= ~MACB_BIT(NCFGR_MTI);
	}

	macb_writel(bp, NCFGR, cfg);
}

static int macb_open(struct net_device *dev)
{
	size_t bufsz = dev->mtu + ETH_HLEN + ETH_FCS_LEN + NET_IP_ALIGN;
	struct macb *bp = netdev_priv(dev);
	struct macb_queue *queue;
	unsigned int q;
	int err;

	netdev_dbg(bp->dev, "open\n");

	err = pm_runtime_get_sync(&bp->pdev->dev);
	if (err < 0)
		goto pm_exit;

	/* RX buffers initialization */
	macb_init_rx_buffer_size(bp, bufsz);

	err = macb_alloc_consistent(bp);
	if (err) {
		netdev_err(dev, "Unable to allocate DMA memory (error %d)\n",
			   err);
		goto pm_exit;
	}

	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue)
		napi_enable(&queue->napi);

	macb_init_hw(bp);

	err = macb_phylink_connect(bp);
	if (err)
		goto reset_hw;

	netif_tx_start_all_queues(dev);

	if (bp->ptp_info)
		bp->ptp_info->ptp_init(dev);

	return 0;

reset_hw:
	macb_reset_hw(bp);
	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue)
		napi_disable(&queue->napi);
	macb_free_consistent(bp);
pm_exit:
	pm_runtime_put_sync(&bp->pdev->dev);
	return err;
}

static int macb_close(struct net_device *dev)
{
	struct macb *bp = netdev_priv(dev);
	struct macb_queue *queue;
	unsigned long flags;
	unsigned int q;

	netif_tx_stop_all_queues(dev);

	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue)
		napi_disable(&queue->napi);

	phylink_stop(bp->phylink);
	phylink_disconnect_phy(bp->phylink);

	spin_lock_irqsave(&bp->lock, flags);
	macb_reset_hw(bp);
	netif_carrier_off(dev);
	spin_unlock_irqrestore(&bp->lock, flags);

	macb_free_consistent(bp);

	if (bp->ptp_info)
		bp->ptp_info->ptp_remove(dev);

	pm_runtime_put(&bp->pdev->dev);

	return 0;
}

static int macb_change_mtu(struct net_device *dev, int new_mtu)
{
	if (netif_running(dev))
		return -EBUSY;

	dev->mtu = new_mtu;

	return 0;
}

static void gem_update_stats(struct macb *bp)
{
	struct macb_queue *queue;
	unsigned int i, q, idx;
	unsigned long *stat;

	u32 *p = &bp->hw_stats.gem.tx_octets_31_0;

	for (i = 0; i < GEM_STATS_LEN; ++i, ++p) {
		u32 offset = gem_statistics[i].offset;
		u64 val = bp->macb_reg_readl(bp, offset);

		bp->ethtool_stats[i] += val;
		*p += val;

		if (offset == GEM_OCTTXL || offset == GEM_OCTRXL) {
			/* Add GEM_OCTTXH, GEM_OCTRXH */
			val = bp->macb_reg_readl(bp, offset + 4);
			bp->ethtool_stats[i] += ((u64)val) << 32;
			*(++p) += val;
		}
	}

	idx = GEM_STATS_LEN;
	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue)
		for (i = 0, stat = &queue->stats.first; i < QUEUE_STATS_LEN; ++i, ++stat)
			bp->ethtool_stats[idx++] = *stat;
}

static struct net_device_stats *gem_get_stats(struct macb *bp)
{
	struct gem_stats *hwstat = &bp->hw_stats.gem;
	struct net_device_stats *nstat = &bp->dev->stats;

	if (!netif_running(bp->dev))
		return nstat;

	gem_update_stats(bp);

	nstat->rx_errors = (hwstat->rx_frame_check_sequence_errors +
			    hwstat->rx_alignment_errors +
			    hwstat->rx_resource_errors +
			    hwstat->rx_overruns +
			    hwstat->rx_oversize_frames +
			    hwstat->rx_jabbers +
			    hwstat->rx_undersized_frames +
			    hwstat->rx_length_field_frame_errors);
	nstat->tx_errors = (hwstat->tx_late_collisions +
			    hwstat->tx_excessive_collisions +
			    hwstat->tx_underrun +
			    hwstat->tx_carrier_sense_errors);
	nstat->multicast = hwstat->rx_multicast_frames;
	nstat->collisions = (hwstat->tx_single_collision_frames +
			     hwstat->tx_multiple_collision_frames +
			     hwstat->tx_excessive_collisions);
	nstat->rx_length_errors = (hwstat->rx_oversize_frames +
				   hwstat->rx_jabbers +
				   hwstat->rx_undersized_frames +
				   hwstat->rx_length_field_frame_errors);
	nstat->rx_over_errors = hwstat->rx_resource_errors;
	nstat->rx_crc_errors = hwstat->rx_frame_check_sequence_errors;
	nstat->rx_frame_errors = hwstat->rx_alignment_errors;
	nstat->rx_fifo_errors = hwstat->rx_overruns;
	nstat->tx_aborted_errors = hwstat->tx_excessive_collisions;
	nstat->tx_carrier_errors = hwstat->tx_carrier_sense_errors;
	nstat->tx_fifo_errors = hwstat->tx_underrun;

	return nstat;
}

static void gem_get_ethtool_stats(struct net_device *dev,
				  struct ethtool_stats *stats, u64 *data)
{
	struct macb *bp;

	bp = netdev_priv(dev);
	gem_update_stats(bp);
	memcpy(data, &bp->ethtool_stats, sizeof(u64)
			* (GEM_STATS_LEN + QUEUE_STATS_LEN * MACB_MAX_QUEUES));
}

static int gem_get_sset_count(struct net_device *dev, int sset)
{
	struct macb *bp = netdev_priv(dev);

	switch (sset) {
	case ETH_SS_STATS:
		return GEM_STATS_LEN + bp->num_queues * QUEUE_STATS_LEN;
	default:
		return -EOPNOTSUPP;
	}
}

static void gem_get_ethtool_strings(struct net_device *dev, u32 sset, u8 *p)
{
	char stat_string[ETH_GSTRING_LEN];
	struct macb *bp = netdev_priv(dev);
	struct macb_queue *queue;
	unsigned int i;
	unsigned int q;

	switch (sset) {
	case ETH_SS_STATS:
		for (i = 0; i < GEM_STATS_LEN; i++, p += ETH_GSTRING_LEN)
			memcpy(p, gem_statistics[i].stat_string,
			       ETH_GSTRING_LEN);

		for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
			for (i = 0; i < QUEUE_STATS_LEN; i++, p += ETH_GSTRING_LEN) {
				snprintf(stat_string, ETH_GSTRING_LEN, "q%d_%s",
						q, queue_statistics[i].stat_string);
				memcpy(p, stat_string, ETH_GSTRING_LEN);
			}
		}
		break;
	}
}

static struct net_device_stats *macb_get_stats(struct net_device *dev)
{
	struct macb *bp = netdev_priv(dev);
	struct net_device_stats *nstat = &bp->dev->stats;
	struct macb_stats *hwstat = &bp->hw_stats.macb;

	if (macb_is_gem(bp))
		return gem_get_stats(bp);

	/* read stats from hardware */
	macb_update_stats(bp);

	/* Convert HW stats into netdevice stats */
	nstat->rx_errors = (hwstat->rx_fcs_errors +
			    hwstat->rx_align_errors +
			    hwstat->rx_resource_errors +
			    hwstat->rx_overruns +
			    hwstat->rx_oversize_pkts +
			    hwstat->rx_jabbers +
			    hwstat->rx_undersize_pkts +
			    hwstat->rx_length_mismatch);
	nstat->tx_errors = (hwstat->tx_late_cols +
			    hwstat->tx_excessive_cols +
			    hwstat->tx_underruns +
			    hwstat->tx_carrier_errors +
			    hwstat->sqe_test_errors);
	nstat->collisions = (hwstat->tx_single_cols +
			     hwstat->tx_multiple_cols +
			     hwstat->tx_excessive_cols);
	nstat->rx_length_errors = (hwstat->rx_oversize_pkts +
				   hwstat->rx_jabbers +
				   hwstat->rx_undersize_pkts +
				   hwstat->rx_length_mismatch);
	nstat->rx_over_errors = hwstat->rx_resource_errors +
				   hwstat->rx_overruns;
	nstat->rx_crc_errors = hwstat->rx_fcs_errors;
	nstat->rx_frame_errors = hwstat->rx_align_errors;
	nstat->rx_fifo_errors = hwstat->rx_overruns;
	/* XXX: What does "missed" mean? */
	nstat->tx_aborted_errors = hwstat->tx_excessive_cols;
	nstat->tx_carrier_errors = hwstat->tx_carrier_errors;
	nstat->tx_fifo_errors = hwstat->tx_underruns;
	/* Don't know about heartbeat or window errors... */

	return nstat;
}

static int macb_get_regs_len(struct net_device *netdev)
{
	return MACB_GREGS_NBR * sizeof(u32);
}

static void macb_get_regs(struct net_device *dev, struct ethtool_regs *regs,
			  void *p)
{
	struct macb *bp = netdev_priv(dev);
	unsigned int tail, head;
	u32 *regs_buff = p;

	regs->version = (macb_readl(bp, MID) & ((1 << MACB_REV_SIZE) - 1))
			| MACB_GREGS_VERSION;

	tail = macb_tx_ring_wrap(bp, bp->queues[0].tx_tail);
	head = macb_tx_ring_wrap(bp, bp->queues[0].tx_head);

	regs_buff[0]  = macb_readl(bp, NCR);
	regs_buff[1]  = macb_or_gem_readl(bp, NCFGR);
	regs_buff[2]  = macb_readl(bp, NSR);
	regs_buff[3]  = macb_readl(bp, TSR);
	regs_buff[4]  = macb_readl(bp, RBQP);
	regs_buff[5]  = macb_readl(bp, TBQP);
	regs_buff[6]  = macb_readl(bp, RSR);
	regs_buff[7]  = macb_readl(bp, IMR);

	regs_buff[8]  = tail;
	regs_buff[9]  = head;
	regs_buff[10] = macb_tx_dma(&bp->queues[0], tail);
	regs_buff[11] = macb_tx_dma(&bp->queues[0], head);

	if (!(bp->caps & MACB_CAPS_USRIO_DISABLED))
		regs_buff[12] = macb_or_gem_readl(bp, USRIO);
	if (macb_is_gem(bp))
		regs_buff[13] = gem_readl(bp, DMACFG);
}

static void macb_get_wol(struct net_device *netdev, struct ethtool_wolinfo *wol)
{
	struct macb *bp = netdev_priv(netdev);

	if (bp->wol & MACB_WOL_HAS_MAGIC_PACKET) {
		phylink_ethtool_get_wol(bp->phylink, wol);
		wol->supported |= WAKE_MAGIC;

		if (bp->wol & MACB_WOL_ENABLED)
			wol->wolopts |= WAKE_MAGIC;
	}
}

static int macb_set_wol(struct net_device *netdev, struct ethtool_wolinfo *wol)
{
	struct macb *bp = netdev_priv(netdev);
	int ret;

	/* Pass the order to phylink layer */
	ret = phylink_ethtool_set_wol(bp->phylink, wol);
	/* Don't manage WoL on MAC if handled by the PHY
	 * or if there's a failure in talking to the PHY
	 */
	if (!ret || ret != -EOPNOTSUPP)
		return ret;

	if (!(bp->wol & MACB_WOL_HAS_MAGIC_PACKET) ||
	    (wol->wolopts & ~WAKE_MAGIC))
		return -EOPNOTSUPP;

	if (wol->wolopts & WAKE_MAGIC)
		bp->wol |= MACB_WOL_ENABLED;
	else
		bp->wol &= ~MACB_WOL_ENABLED;

	device_set_wakeup_enable(&bp->pdev->dev, bp->wol & MACB_WOL_ENABLED);

	return 0;
}

static int macb_get_link_ksettings(struct net_device *netdev,
				   struct ethtool_link_ksettings *kset)
{
	struct macb *bp = netdev_priv(netdev);

	return phylink_ethtool_ksettings_get(bp->phylink, kset);
}

static int macb_set_link_ksettings(struct net_device *netdev,
				   const struct ethtool_link_ksettings *kset)
{
	struct macb *bp = netdev_priv(netdev);

	return phylink_ethtool_ksettings_set(bp->phylink, kset);
}

static void macb_get_ringparam(struct net_device *netdev,
			       struct ethtool_ringparam *ring)
{
	struct macb *bp = netdev_priv(netdev);

	ring->rx_max_pending = MAX_RX_RING_SIZE;
	ring->tx_max_pending = MAX_TX_RING_SIZE;

	ring->rx_pending = bp->rx_ring_size;
	ring->tx_pending = bp->tx_ring_size;
}

static int macb_set_ringparam(struct net_device *netdev,
			      struct ethtool_ringparam *ring)
{
	struct macb *bp = netdev_priv(netdev);
	u32 new_rx_size, new_tx_size;
	unsigned int reset = 0;

	if ((ring->rx_mini_pending) || (ring->rx_jumbo_pending))
		return -EINVAL;

	new_rx_size = clamp_t(u32, ring->rx_pending,
			      MIN_RX_RING_SIZE, MAX_RX_RING_SIZE);
	new_rx_size = roundup_pow_of_two(new_rx_size);

	new_tx_size = clamp_t(u32, ring->tx_pending,
			      MIN_TX_RING_SIZE, MAX_TX_RING_SIZE);
	new_tx_size = roundup_pow_of_two(new_tx_size);

	if ((new_tx_size == bp->tx_ring_size) &&
	    (new_rx_size == bp->rx_ring_size)) {
		/* nothing to do */
		return 0;
	}

	if (netif_running(bp->dev)) {
		reset = 1;
		macb_close(bp->dev);
	}

	bp->rx_ring_size = new_rx_size;
	bp->tx_ring_size = new_tx_size;

	if (reset)
		macb_open(bp->dev);

	return 0;
}

#ifdef CONFIG_MACB_USE_HWSTAMP
static unsigned int gem_get_tsu_rate(struct macb *bp)
{
	struct clk *tsu_clk;
	unsigned int tsu_rate;

	tsu_clk = devm_clk_get(&bp->pdev->dev, "tsu_clk");
	if (!IS_ERR(tsu_clk))
		tsu_rate = clk_get_rate(tsu_clk);
	/* try pclk instead */
	else if (!IS_ERR(bp->pclk)) {
		tsu_clk = bp->pclk;
		tsu_rate = clk_get_rate(tsu_clk);
	} else
		return -ENOTSUPP;
	return tsu_rate;
}

static s32 gem_get_ptp_max_adj(void)
{
	return 64000000;
}

static int gem_get_ts_info(struct net_device *dev,
			   struct ethtool_ts_info *info)
{
	struct macb *bp = netdev_priv(dev);

	if ((bp->hw_dma_cap & HW_DMA_CAP_PTP) == 0) {
		ethtool_op_get_ts_info(dev, info);
		return 0;
	}

	info->so_timestamping =
		SOF_TIMESTAMPING_TX_SOFTWARE |
		SOF_TIMESTAMPING_RX_SOFTWARE |
		SOF_TIMESTAMPING_SOFTWARE |
		SOF_TIMESTAMPING_TX_HARDWARE |
		SOF_TIMESTAMPING_RX_HARDWARE |
		SOF_TIMESTAMPING_RAW_HARDWARE;
	info->tx_types =
		(1 << HWTSTAMP_TX_ONESTEP_SYNC) |
		(1 << HWTSTAMP_TX_OFF) |
		(1 << HWTSTAMP_TX_ON);
	info->rx_filters =
		(1 << HWTSTAMP_FILTER_NONE) |
		(1 << HWTSTAMP_FILTER_ALL);

	info->phc_index = bp->ptp_clock ? ptp_clock_index(bp->ptp_clock) : -1;

	return 0;
}

static struct macb_ptp_info gem_ptp_info = {
	.ptp_init	 = gem_ptp_init,
	.ptp_remove	 = gem_ptp_remove,
	.get_ptp_max_adj = gem_get_ptp_max_adj,
	.get_tsu_rate	 = gem_get_tsu_rate,
	.get_ts_info	 = gem_get_ts_info,
	.get_hwtst	 = gem_get_hwtst,
	.set_hwtst	 = gem_set_hwtst,
};
#endif

static int macb_get_ts_info(struct net_device *netdev,
			    struct ethtool_ts_info *info)
{
	struct macb *bp = netdev_priv(netdev);

	if (bp->ptp_info)
		return bp->ptp_info->get_ts_info(netdev, info);

	return ethtool_op_get_ts_info(netdev, info);
}

static void gem_enable_flow_filters(struct macb *bp, bool enable)
{
	struct net_device *netdev = bp->dev;
	struct ethtool_rx_fs_item *item;
	u32 t2_scr;
	int num_t2_scr;

	if (!(netdev->features & NETIF_F_NTUPLE))
		return;

	num_t2_scr = GEM_BFEXT(T2SCR, gem_readl(bp, DCFG8));

	list_for_each_entry(item, &bp->rx_fs_list.list, list) {
		struct ethtool_rx_flow_spec *fs = &item->fs;
		struct ethtool_tcpip4_spec *tp4sp_m;

		if (fs->location >= num_t2_scr)
			continue;

		t2_scr = gem_readl_n(bp, SCRT2, fs->location);

		/* enable/disable screener regs for the flow entry */
		t2_scr = GEM_BFINS(ETHTEN, enable, t2_scr);

		/* only enable fields with no masking */
		tp4sp_m = &(fs->m_u.tcp_ip4_spec);

		if (enable && (tp4sp_m->ip4src == 0xFFFFFFFF))
			t2_scr = GEM_BFINS(CMPAEN, 1, t2_scr);
		else
			t2_scr = GEM_BFINS(CMPAEN, 0, t2_scr);

		if (enable && (tp4sp_m->ip4dst == 0xFFFFFFFF))
			t2_scr = GEM_BFINS(CMPBEN, 1, t2_scr);
		else
			t2_scr = GEM_BFINS(CMPBEN, 0, t2_scr);

		if (enable && ((tp4sp_m->psrc == 0xFFFF) || (tp4sp_m->pdst == 0xFFFF)))
			t2_scr = GEM_BFINS(CMPCEN, 1, t2_scr);
		else
			t2_scr = GEM_BFINS(CMPCEN, 0, t2_scr);

		gem_writel_n(bp, SCRT2, fs->location, t2_scr);
	}
}

static void gem_prog_cmp_regs(struct macb *bp, struct ethtool_rx_flow_spec *fs)
{
	struct ethtool_tcpip4_spec *tp4sp_v, *tp4sp_m;
	uint16_t index = fs->location;
	u32 w0, w1, t2_scr;
	bool cmp_a = false;
	bool cmp_b = false;
	bool cmp_c = false;

	if (!macb_is_gem(bp))
		return;

	tp4sp_v = &(fs->h_u.tcp_ip4_spec);
	tp4sp_m = &(fs->m_u.tcp_ip4_spec);

	/* ignore field if any masking set */
	if (tp4sp_m->ip4src == 0xFFFFFFFF) {
		/* 1st compare reg - IP source address */
		w0 = 0;
		w1 = 0;
		w0 = tp4sp_v->ip4src;
		w1 = GEM_BFINS(T2DISMSK, 1, w1); /* 32-bit compare */
		w1 = GEM_BFINS(T2CMPOFST, GEM_T2COMPOFST_ETYPE, w1);
		w1 = GEM_BFINS(T2OFST, ETYPE_SRCIP_OFFSET, w1);
		gem_writel_n(bp, T2CMPW0, T2CMP_OFST(GEM_IP4SRC_CMP(index)), w0);
		gem_writel_n(bp, T2CMPW1, T2CMP_OFST(GEM_IP4SRC_CMP(index)), w1);
		cmp_a = true;
	}

	/* ignore field if any masking set */
	if (tp4sp_m->ip4dst == 0xFFFFFFFF) {
		/* 2nd compare reg - IP destination address */
		w0 = 0;
		w1 = 0;
		w0 = tp4sp_v->ip4dst;
		w1 = GEM_BFINS(T2DISMSK, 1, w1); /* 32-bit compare */
		w1 = GEM_BFINS(T2CMPOFST, GEM_T2COMPOFST_ETYPE, w1);
		w1 = GEM_BFINS(T2OFST, ETYPE_DSTIP_OFFSET, w1);
		gem_writel_n(bp, T2CMPW0, T2CMP_OFST(GEM_IP4DST_CMP(index)), w0);
		gem_writel_n(bp, T2CMPW1, T2CMP_OFST(GEM_IP4DST_CMP(index)), w1);
		cmp_b = true;
	}

	/* ignore both port fields if masking set in both */
	if ((tp4sp_m->psrc == 0xFFFF) || (tp4sp_m->pdst == 0xFFFF)) {
		/* 3rd compare reg - source port, destination port */
		w0 = 0;
		w1 = 0;
		w1 = GEM_BFINS(T2CMPOFST, GEM_T2COMPOFST_IPHDR, w1);
		if (tp4sp_m->psrc == tp4sp_m->pdst) {
			w0 = GEM_BFINS(T2MASK, tp4sp_v->psrc, w0);
			w0 = GEM_BFINS(T2CMP, tp4sp_v->pdst, w0);
			w1 = GEM_BFINS(T2DISMSK, 1, w1); /* 32-bit compare */
			w1 = GEM_BFINS(T2OFST, IPHDR_SRCPORT_OFFSET, w1);
		} else {
			/* only one port definition */
			w1 = GEM_BFINS(T2DISMSK, 0, w1); /* 16-bit compare */
			w0 = GEM_BFINS(T2MASK, 0xFFFF, w0);
			if (tp4sp_m->psrc == 0xFFFF) { /* src port */
				w0 = GEM_BFINS(T2CMP, tp4sp_v->psrc, w0);
				w1 = GEM_BFINS(T2OFST, IPHDR_SRCPORT_OFFSET, w1);
			} else { /* dst port */
				w0 = GEM_BFINS(T2CMP, tp4sp_v->pdst, w0);
				w1 = GEM_BFINS(T2OFST, IPHDR_DSTPORT_OFFSET, w1);
			}
		}
		gem_writel_n(bp, T2CMPW0, T2CMP_OFST(GEM_PORT_CMP(index)), w0);
		gem_writel_n(bp, T2CMPW1, T2CMP_OFST(GEM_PORT_CMP(index)), w1);
		cmp_c = true;
	}

	t2_scr = 0;
	t2_scr = GEM_BFINS(QUEUE, (fs->ring_cookie) & 0xFF, t2_scr);
	t2_scr = GEM_BFINS(ETHT2IDX, SCRT2_ETHT, t2_scr);
	if (cmp_a)
		t2_scr = GEM_BFINS(CMPA, GEM_IP4SRC_CMP(index), t2_scr);
	if (cmp_b)
		t2_scr = GEM_BFINS(CMPB, GEM_IP4DST_CMP(index), t2_scr);
	if (cmp_c)
		t2_scr = GEM_BFINS(CMPC, GEM_PORT_CMP(index), t2_scr);
	gem_writel_n(bp, SCRT2, index, t2_scr);
}

static int gem_add_flow_filter(struct net_device *netdev,
		struct ethtool_rxnfc *cmd)
{
	struct macb *bp = netdev_priv(netdev);
	struct ethtool_rx_flow_spec *fs = &cmd->fs;
	struct ethtool_rx_fs_item *item, *newfs;
	unsigned long flags;
	int ret = -EINVAL;
	bool added = false;

	newfs = kmalloc(sizeof(*newfs), GFP_KERNEL);
	if (newfs == NULL)
		return -ENOMEM;
	memcpy(&newfs->fs, fs, sizeof(newfs->fs));

	netdev_dbg(netdev,
			"Adding flow filter entry,type=%u,queue=%u,loc=%u,src=%08X,dst=%08X,ps=%u,pd=%u\n",
			fs->flow_type, (int)fs->ring_cookie, fs->location,
			htonl(fs->h_u.tcp_ip4_spec.ip4src),
			htonl(fs->h_u.tcp_ip4_spec.ip4dst),
			htons(fs->h_u.tcp_ip4_spec.psrc), htons(fs->h_u.tcp_ip4_spec.pdst));

	spin_lock_irqsave(&bp->rx_fs_lock, flags);

	/* find correct place to add in list */
	list_for_each_entry(item, &bp->rx_fs_list.list, list) {
		if (item->fs.location > newfs->fs.location) {
			list_add_tail(&newfs->list, &item->list);
			added = true;
			break;
		} else if (item->fs.location == fs->location) {
			netdev_err(netdev, "Rule not added: location %d not free!\n",
					fs->location);
			ret = -EBUSY;
			goto err;
		}
	}
	if (!added)
		list_add_tail(&newfs->list, &bp->rx_fs_list.list);

	gem_prog_cmp_regs(bp, fs);
	bp->rx_fs_list.count++;
	/* enable filtering if NTUPLE on */
	gem_enable_flow_filters(bp, 1);

	spin_unlock_irqrestore(&bp->rx_fs_lock, flags);
	return 0;

err:
	spin_unlock_irqrestore(&bp->rx_fs_lock, flags);
	kfree(newfs);
	return ret;
}

static int gem_del_flow_filter(struct net_device *netdev,
		struct ethtool_rxnfc *cmd)
{
	struct macb *bp = netdev_priv(netdev);
	struct ethtool_rx_fs_item *item;
	struct ethtool_rx_flow_spec *fs;
	unsigned long flags;

	spin_lock_irqsave(&bp->rx_fs_lock, flags);

	list_for_each_entry(item, &bp->rx_fs_list.list, list) {
		if (item->fs.location == cmd->fs.location) {
			/* disable screener regs for the flow entry */
			fs = &(item->fs);
			netdev_dbg(netdev,
					"Deleting flow filter entry,type=%u,queue=%u,loc=%u,src=%08X,dst=%08X,ps=%u,pd=%u\n",
					fs->flow_type, (int)fs->ring_cookie, fs->location,
					htonl(fs->h_u.tcp_ip4_spec.ip4src),
					htonl(fs->h_u.tcp_ip4_spec.ip4dst),
					htons(fs->h_u.tcp_ip4_spec.psrc),
					htons(fs->h_u.tcp_ip4_spec.pdst));

			gem_writel_n(bp, SCRT2, fs->location, 0);

			list_del(&item->list);
			bp->rx_fs_list.count--;
			spin_unlock_irqrestore(&bp->rx_fs_lock, flags);
			kfree(item);
			return 0;
		}
	}

	spin_unlock_irqrestore(&bp->rx_fs_lock, flags);
	return -EINVAL;
}

static int gem_get_flow_entry(struct net_device *netdev,
		struct ethtool_rxnfc *cmd)
{
	struct macb *bp = netdev_priv(netdev);
	struct ethtool_rx_fs_item *item;

	list_for_each_entry(item, &bp->rx_fs_list.list, list) {
		if (item->fs.location == cmd->fs.location) {
			memcpy(&cmd->fs, &item->fs, sizeof(cmd->fs));
			return 0;
		}
	}
	return -EINVAL;
}

static int gem_get_all_flow_entries(struct net_device *netdev,
		struct ethtool_rxnfc *cmd, u32 *rule_locs)
{
	struct macb *bp = netdev_priv(netdev);
	struct ethtool_rx_fs_item *item;
	uint32_t cnt = 0;

	list_for_each_entry(item, &bp->rx_fs_list.list, list) {
		if (cnt == cmd->rule_cnt)
			return -EMSGSIZE;
		rule_locs[cnt] = item->fs.location;
		cnt++;
	}
	cmd->data = bp->max_tuples;
	cmd->rule_cnt = cnt;

	return 0;
}

static int gem_get_rxnfc(struct net_device *netdev, struct ethtool_rxnfc *cmd,
		u32 *rule_locs)
{
	struct macb *bp = netdev_priv(netdev);
	int ret = 0;

	switch (cmd->cmd) {
	case ETHTOOL_GRXRINGS:
		cmd->data = bp->num_queues;
		break;
	case ETHTOOL_GRXCLSRLCNT:
		cmd->rule_cnt = bp->rx_fs_list.count;
		break;
	case ETHTOOL_GRXCLSRULE:
		ret = gem_get_flow_entry(netdev, cmd);
		break;
	case ETHTOOL_GRXCLSRLALL:
		ret = gem_get_all_flow_entries(netdev, cmd, rule_locs);
		break;
	default:
		netdev_err(netdev,
			  "Command parameter %d is not supported\n", cmd->cmd);
		ret = -EOPNOTSUPP;
	}

	return ret;
}

static int gem_set_rxnfc(struct net_device *netdev, struct ethtool_rxnfc *cmd)
{
	struct macb *bp = netdev_priv(netdev);
	int ret;

	switch (cmd->cmd) {
	case ETHTOOL_SRXCLSRLINS:
		if ((cmd->fs.location >= bp->max_tuples)
				|| (cmd->fs.ring_cookie >= bp->num_queues)) {
			ret = -EINVAL;
			break;
		}
		ret = gem_add_flow_filter(netdev, cmd);
		break;
	case ETHTOOL_SRXCLSRLDEL:
		ret = gem_del_flow_filter(netdev, cmd);
		break;
	default:
		netdev_err(netdev,
			  "Command parameter %d is not supported\n", cmd->cmd);
		ret = -EOPNOTSUPP;
	}

	return ret;
}

static const struct ethtool_ops macb_ethtool_ops = {
	.get_regs_len		= macb_get_regs_len,
	.get_regs		= macb_get_regs,
	.get_link		= ethtool_op_get_link,
	.get_ts_info		= ethtool_op_get_ts_info,
	.get_wol		= macb_get_wol,
	.set_wol		= macb_set_wol,
	.get_link_ksettings     = macb_get_link_ksettings,
	.set_link_ksettings     = macb_set_link_ksettings,
	.get_ringparam		= macb_get_ringparam,
	.set_ringparam		= macb_set_ringparam,
};

static const struct ethtool_ops gem_ethtool_ops = {
	.get_regs_len		= macb_get_regs_len,
	.get_regs		= macb_get_regs,
	.get_wol		= macb_get_wol,
	.set_wol		= macb_set_wol,
	.get_link		= ethtool_op_get_link,
	.get_ts_info		= macb_get_ts_info,
	.get_ethtool_stats	= gem_get_ethtool_stats,
	.get_strings		= gem_get_ethtool_strings,
	.get_sset_count		= gem_get_sset_count,
	.get_link_ksettings     = macb_get_link_ksettings,
	.set_link_ksettings     = macb_set_link_ksettings,
	.get_ringparam		= macb_get_ringparam,
	.set_ringparam		= macb_set_ringparam,
	.get_rxnfc			= gem_get_rxnfc,
	.set_rxnfc			= gem_set_rxnfc,
};

static int macb_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
	struct macb *bp = netdev_priv(dev);

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

	if (bp->ptp_info) {
		switch (cmd) {
		case SIOCSHWTSTAMP:
			return bp->ptp_info->set_hwtst(dev, rq, cmd);
		case SIOCGHWTSTAMP:
			return bp->ptp_info->get_hwtst(dev, rq);
		}
	}

	return phylink_mii_ioctl(bp->phylink, rq, cmd);
}

static inline void macb_set_txcsum_feature(struct macb *bp,
					   netdev_features_t features)
{
	u32 val;

	if (!macb_is_gem(bp))
		return;

	val = gem_readl(bp, DMACFG);
	if (features & NETIF_F_HW_CSUM)
		val |= GEM_BIT(TXCOEN);
	else
		val &= ~GEM_BIT(TXCOEN);

	gem_writel(bp, DMACFG, val);
}

static inline void macb_set_rxcsum_feature(struct macb *bp,
					   netdev_features_t features)
{
	struct net_device *netdev = bp->dev;
	u32 val;

	if (!macb_is_gem(bp))
		return;

	val = gem_readl(bp, NCFGR);
	if ((features & NETIF_F_RXCSUM) && !(netdev->flags & IFF_PROMISC))
		val |= GEM_BIT(RXCOEN);
	else
		val &= ~GEM_BIT(RXCOEN);

	gem_writel(bp, NCFGR, val);
}

static inline void macb_set_rxflow_feature(struct macb *bp,
					   netdev_features_t features)
{
	if (!macb_is_gem(bp))
		return;

	gem_enable_flow_filters(bp, !!(features & NETIF_F_NTUPLE));
}

static int macb_set_features(struct net_device *netdev,
			     netdev_features_t features)
{
	struct macb *bp = netdev_priv(netdev);
	netdev_features_t changed = features ^ netdev->features;

	/* TX checksum offload */
	if (changed & NETIF_F_HW_CSUM)
		macb_set_txcsum_feature(bp, features);

	/* RX checksum offload */
	if (changed & NETIF_F_RXCSUM)
		macb_set_rxcsum_feature(bp, features);

	/* RX Flow Filters */
	if (changed & NETIF_F_NTUPLE)
		macb_set_rxflow_feature(bp, features);

	return 0;
}

static void macb_restore_features(struct macb *bp)
{
	struct net_device *netdev = bp->dev;
	netdev_features_t features = netdev->features;
	struct ethtool_rx_fs_item *item;

	/* TX checksum offload */
	macb_set_txcsum_feature(bp, features);

	/* RX checksum offload */
	macb_set_rxcsum_feature(bp, features);

	/* RX Flow Filters */
	list_for_each_entry(item, &bp->rx_fs_list.list, list)
		gem_prog_cmp_regs(bp, &item->fs);

	macb_set_rxflow_feature(bp, features);
}

static const struct net_device_ops macb_netdev_ops = {
	.ndo_open		= macb_open,
	.ndo_stop		= macb_close,
	.ndo_start_xmit		= macb_start_xmit,
	.ndo_set_rx_mode	= macb_set_rx_mode,
	.ndo_get_stats		= macb_get_stats,
	.ndo_eth_ioctl		= macb_ioctl,
	.ndo_validate_addr	= eth_validate_addr,
	.ndo_change_mtu		= macb_change_mtu,
	.ndo_set_mac_address	= eth_mac_addr,
#ifdef CONFIG_NET_POLL_CONTROLLER
	.ndo_poll_controller	= macb_poll_controller,
#endif
	.ndo_set_features	= macb_set_features,
	.ndo_features_check	= macb_features_check,
};

/* Configure peripheral capabilities according to device tree
 * and integration options used
 */
static void macb_configure_caps(struct macb *bp,
				const struct macb_config *dt_conf)
{
	u32 dcfg;

	if (dt_conf)
		bp->caps = dt_conf->caps;

	if (hw_is_gem(bp->regs, bp->native_io)) {
		bp->caps |= MACB_CAPS_MACB_IS_GEM;

		dcfg = gem_readl(bp, DCFG1);
		if (GEM_BFEXT(IRQCOR, dcfg) == 0)
			bp->caps |= MACB_CAPS_ISR_CLEAR_ON_WRITE;
		if (GEM_BFEXT(NO_PCS, dcfg) == 0)
			bp->caps |= MACB_CAPS_PCS;
		dcfg = gem_readl(bp, DCFG12);
		if (GEM_BFEXT(HIGH_SPEED, dcfg) == 1)
			bp->caps |= MACB_CAPS_HIGH_SPEED;
		dcfg = gem_readl(bp, DCFG2);
		if ((dcfg & (GEM_BIT(RX_PKT_BUFF) | GEM_BIT(TX_PKT_BUFF))) == 0)
			bp->caps |= MACB_CAPS_FIFO_MODE;
#ifdef CONFIG_MACB_USE_HWSTAMP
		if (gem_has_ptp(bp)) {
			if (!GEM_BFEXT(TSU, gem_readl(bp, DCFG5)))
				dev_err(&bp->pdev->dev,
					"GEM doesn't support hardware ptp.\n");
			else {
				bp->hw_dma_cap |= HW_DMA_CAP_PTP;
				bp->ptp_info = &gem_ptp_info;
			}
		}
#endif
	}

	dev_dbg(&bp->pdev->dev, "Cadence caps 0x%08x\n", bp->caps);
}

static void macb_probe_queues(void __iomem *mem,
			      bool native_io,
			      unsigned int *queue_mask,
			      unsigned int *num_queues)
{
	*queue_mask = 0x1;
	*num_queues = 1;

	/* is it macb or gem ?
	 *
	 * We need to read directly from the hardware here because
	 * we are early in the probe process and don't have the
	 * MACB_CAPS_MACB_IS_GEM flag positioned
	 */
	if (!hw_is_gem(mem, native_io))
		return;

	/* bit 0 is never set but queue 0 always exists */
	*queue_mask |= readl_relaxed(mem + GEM_DCFG6) & 0xff;
	*num_queues = hweight32(*queue_mask);
}

static void macb_clks_disable(struct clk *pclk, struct clk *hclk, struct clk *tx_clk,
			      struct clk *rx_clk, struct clk *tsu_clk)
{
	struct clk_bulk_data clks[] = {
		{ .clk = tsu_clk, },
		{ .clk = rx_clk, },
		{ .clk = pclk, },
		{ .clk = hclk, },
		{ .clk = tx_clk },
	};

	clk_bulk_disable_unprepare(ARRAY_SIZE(clks), clks);
}

static int macb_clk_init(struct platform_device *pdev, struct clk **pclk,
			 struct clk **hclk, struct clk **tx_clk,
			 struct clk **rx_clk, struct clk **tsu_clk)
{
	struct macb_platform_data *pdata;
	int err;

	pdata = dev_get_platdata(&pdev->dev);
	if (pdata) {
		*pclk = pdata->pclk;
		*hclk = pdata->hclk;
	} else {
		*pclk = devm_clk_get(&pdev->dev, "pclk");
		*hclk = devm_clk_get(&pdev->dev, "hclk");
	}

	if (IS_ERR_OR_NULL(*pclk))
		return dev_err_probe(&pdev->dev,
				     IS_ERR(*pclk) ? PTR_ERR(*pclk) : -ENODEV,
				     "failed to get pclk\n");

	if (IS_ERR_OR_NULL(*hclk))
		return dev_err_probe(&pdev->dev,
				     IS_ERR(*hclk) ? PTR_ERR(*hclk) : -ENODEV,
				     "failed to get hclk\n");

	*tx_clk = devm_clk_get_optional(&pdev->dev, "tx_clk");
	if (IS_ERR(*tx_clk))
		return PTR_ERR(*tx_clk);

	*rx_clk = devm_clk_get_optional(&pdev->dev, "rx_clk");
	if (IS_ERR(*rx_clk))
		return PTR_ERR(*rx_clk);

	*tsu_clk = devm_clk_get_optional(&pdev->dev, "tsu_clk");
	if (IS_ERR(*tsu_clk))
		return PTR_ERR(*tsu_clk);

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

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

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

	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(*tsu_clk);
	if (err) {
		dev_err(&pdev->dev, "failed to enable tsu_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_hclk:
	clk_disable_unprepare(*hclk);

err_disable_pclk:
	clk_disable_unprepare(*pclk);

	return err;
}

static int macb_init(struct platform_device *pdev)
{
	struct net_device *dev = platform_get_drvdata(pdev);
	unsigned int hw_q, q;
	struct macb *bp = netdev_priv(dev);
	struct macb_queue *queue;
	int err;
	u32 val, reg;

	bp->tx_ring_size = DEFAULT_TX_RING_SIZE;
	bp->rx_ring_size = DEFAULT_RX_RING_SIZE;

	/* set the queue register mapping once for all: queue0 has a special
	 * register mapping but we don't want to test the queue index then
	 * compute the corresponding register offset at run time.
	 */
	for (hw_q = 0, q = 0; hw_q < MACB_MAX_QUEUES; ++hw_q) {
		if (!(bp->queue_mask & (1 << hw_q)))
			continue;

		queue = &bp->queues[q];
		queue->bp = bp;
		netif_napi_add(dev, &queue->napi, macb_poll, NAPI_POLL_WEIGHT);
		if (hw_q) {
			queue->ISR  = GEM_ISR(hw_q - 1);
			queue->IER  = GEM_IER(hw_q - 1);
			queue->IDR  = GEM_IDR(hw_q - 1);
			queue->IMR  = GEM_IMR(hw_q - 1);
			queue->TBQP = GEM_TBQP(hw_q - 1);
			queue->RBQP = GEM_RBQP(hw_q - 1);
			queue->RBQS = GEM_RBQS(hw_q - 1);
#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
			if (bp->hw_dma_cap & HW_DMA_CAP_64B) {
				queue->TBQPH = GEM_TBQPH(hw_q - 1);
				queue->RBQPH = GEM_RBQPH(hw_q - 1);
			}
#endif
		} else {
			/* queue0 uses legacy registers */
			queue->ISR  = MACB_ISR;
			queue->IER  = MACB_IER;
			queue->IDR  = MACB_IDR;
			queue->IMR  = MACB_IMR;
			queue->TBQP = MACB_TBQP;
			queue->RBQP = MACB_RBQP;
#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
			if (bp->hw_dma_cap & HW_DMA_CAP_64B) {
				queue->TBQPH = MACB_TBQPH;
				queue->RBQPH = MACB_RBQPH;
			}
#endif
		}

		/* get irq: here we use the linux queue index, not the hardware
		 * queue index. the queue irq definitions in the device tree
		 * must remove the optional gaps that could exist in the
		 * hardware queue mask.
		 */
		queue->irq = platform_get_irq(pdev, q);
		err = devm_request_irq(&pdev->dev, queue->irq, macb_interrupt,
				       IRQF_SHARED, dev->name, queue);
		if (err) {
			dev_err(&pdev->dev,
				"Unable to request IRQ %d (error %d)\n",
				queue->irq, err);
			return err;
		}

		INIT_WORK(&queue->tx_error_task, macb_tx_error_task);
		q++;
	}

	dev->netdev_ops = &macb_netdev_ops;

	/* setup appropriated routines according to adapter type */
	if (macb_is_gem(bp)) {
		bp->max_tx_length = GEM_MAX_TX_LEN;
		bp->macbgem_ops.mog_alloc_rx_buffers = gem_alloc_rx_buffers;
		bp->macbgem_ops.mog_free_rx_buffers = gem_free_rx_buffers;
		bp->macbgem_ops.mog_init_rings = gem_init_rings;
		bp->macbgem_ops.mog_rx = gem_rx;
		dev->ethtool_ops = &gem_ethtool_ops;
	} else {
		bp->max_tx_length = MACB_MAX_TX_LEN;
		bp->macbgem_ops.mog_alloc_rx_buffers = macb_alloc_rx_buffers;
		bp->macbgem_ops.mog_free_rx_buffers = macb_free_rx_buffers;
		bp->macbgem_ops.mog_init_rings = macb_init_rings;
		bp->macbgem_ops.mog_rx = macb_rx;
		dev->ethtool_ops = &macb_ethtool_ops;
	}

	/* Set features */
	dev->hw_features = NETIF_F_SG;

	/* Check LSO capability */
	if (GEM_BFEXT(PBUF_LSO, gem_readl(bp, DCFG6)))
		dev->hw_features |= MACB_NETIF_LSO;

	/* Checksum offload is only available on gem with packet buffer */
	if (macb_is_gem(bp) && !(bp->caps & MACB_CAPS_FIFO_MODE))
		dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
	if (bp->caps & MACB_CAPS_SG_DISABLED)
		dev->hw_features &= ~NETIF_F_SG;
	dev->features = dev->hw_features;

	/* Check RX Flow Filters support.
	 * Max Rx flows set by availability of screeners & compare regs:
	 * each 4-tuple define requires 1 T2 screener reg + 3 compare regs
	 */
	reg = gem_readl(bp, DCFG8);
	bp->max_tuples = min((GEM_BFEXT(SCR2CMP, reg) / 3),
			GEM_BFEXT(T2SCR, reg));
	INIT_LIST_HEAD(&bp->rx_fs_list.list);
	if (bp->max_tuples > 0) {
		/* also needs one ethtype match to check IPv4 */
		if (GEM_BFEXT(SCR2ETH, reg) > 0) {
			/* program this reg now */
			reg = 0;
			reg = GEM_BFINS(ETHTCMP, (uint16_t)ETH_P_IP, reg);
			gem_writel_n(bp, ETHT, SCRT2_ETHT, reg);
			/* Filtering is supported in hw but don't enable it in kernel now */
			dev->hw_features |= NETIF_F_NTUPLE;
			/* init Rx flow definitions */
			bp->rx_fs_list.count = 0;
			spin_lock_init(&bp->rx_fs_lock);
		} else
			bp->max_tuples = 0;
	}

	if (!(bp->caps & MACB_CAPS_USRIO_DISABLED)) {
		val = 0;
		if (phy_interface_mode_is_rgmii(bp->phy_interface))
			val = bp->usrio->rgmii;
		else if (bp->phy_interface == PHY_INTERFACE_MODE_RMII &&
			 (bp->caps & MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII))
			val = bp->usrio->rmii;
		else if (!(bp->caps & MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII))
			val = bp->usrio->mii;

		if (bp->caps & MACB_CAPS_USRIO_HAS_CLKEN)
			val |= bp->usrio->refclk;

		macb_or_gem_writel(bp, USRIO, val);
	}

	/* Set MII management clock divider */
	val = macb_mdc_clk_div(bp);
	val |= macb_dbw(bp);
	if (bp->phy_interface == PHY_INTERFACE_MODE_SGMII)
		val |= GEM_BIT(SGMIIEN) | GEM_BIT(PCSSEL);
	macb_writel(bp, NCFGR, val);

	return 0;
}

static const struct macb_usrio_config macb_default_usrio = {
	.mii = MACB_BIT(MII),
	.rmii = MACB_BIT(RMII),
	.rgmii = GEM_BIT(RGMII),
	.refclk = MACB_BIT(CLKEN),
};

#if defined(CONFIG_OF)
/* 1518 rounded up */
#define AT91ETHER_MAX_RBUFF_SZ	0x600
/* max number of receive buffers */
#define AT91ETHER_MAX_RX_DESCR	9

static struct sifive_fu540_macb_mgmt *mgmt;

static int at91ether_alloc_coherent(struct macb *lp)
{
	struct macb_queue *q = &lp->queues[0];

	q->rx_ring = dma_alloc_coherent(&lp->pdev->dev,
					 (AT91ETHER_MAX_RX_DESCR *
					  macb_dma_desc_get_size(lp)),
					 &q->rx_ring_dma, GFP_KERNEL);
	if (!q->rx_ring)
		return -ENOMEM;

	q->rx_buffers = dma_alloc_coherent(&lp->pdev->dev,
					    AT91ETHER_MAX_RX_DESCR *
					    AT91ETHER_MAX_RBUFF_SZ,
					    &q->rx_buffers_dma, GFP_KERNEL);
	if (!q->rx_buffers) {
		dma_free_coherent(&lp->pdev->dev,
				  AT91ETHER_MAX_RX_DESCR *
				  macb_dma_desc_get_size(lp),
				  q->rx_ring, q->rx_ring_dma);
		q->rx_ring = NULL;
		return -ENOMEM;
	}

	return 0;
}

static void at91ether_free_coherent(struct macb *lp)
{
	struct macb_queue *q = &lp->queues[0];

	if (q->rx_ring) {
		dma_free_coherent(&lp->pdev->dev,
				  AT91ETHER_MAX_RX_DESCR *
				  macb_dma_desc_get_size(lp),
				  q->rx_ring, q->rx_ring_dma);
		q->rx_ring = NULL;
	}

	if (q->rx_buffers) {
		dma_free_coherent(&lp->pdev->dev,
				  AT91ETHER_MAX_RX_DESCR *
				  AT91ETHER_MAX_RBUFF_SZ,
				  q->rx_buffers, q->rx_buffers_dma);
		q->rx_buffers = NULL;
	}
}

/* Initialize and start the Receiver and Transmit subsystems */
static int at91ether_start(struct macb *lp)
{
	struct macb_queue *q = &lp->queues[0];
	struct macb_dma_desc *desc;
	dma_addr_t addr;
	u32 ctl;
	int i, ret;

	ret = at91ether_alloc_coherent(lp);
	if (ret)
		return ret;

	addr = q->rx_buffers_dma;
	for (i = 0; i < AT91ETHER_MAX_RX_DESCR; i++) {
		desc = macb_rx_desc(q, i);
		macb_set_addr(lp, desc, addr);
		desc->ctrl = 0;
		addr += AT91ETHER_MAX_RBUFF_SZ;
	}

	/* Set the Wrap bit on the last descriptor */
	desc->addr |= MACB_BIT(RX_WRAP);

	/* Reset buffer index */
	q->rx_tail = 0;

	/* Program address of descriptor list in Rx Buffer Queue register */
	macb_writel(lp, RBQP, q->rx_ring_dma);

	/* Enable Receive and Transmit */
	ctl = macb_readl(lp, NCR);
	macb_writel(lp, NCR, ctl | MACB_BIT(RE) | MACB_BIT(TE));

	/* Enable MAC interrupts */
	macb_writel(lp, IER, MACB_BIT(RCOMP)	|
			     MACB_BIT(RXUBR)	|
			     MACB_BIT(ISR_TUND)	|
			     MACB_BIT(ISR_RLE)	|
			     MACB_BIT(TCOMP)	|
			     MACB_BIT(ISR_ROVR)	|
			     MACB_BIT(HRESP));

	return 0;
}

static void at91ether_stop(struct macb *lp)
{
	u32 ctl;

	/* Disable MAC interrupts */
	macb_writel(lp, IDR, MACB_BIT(RCOMP)	|
			     MACB_BIT(RXUBR)	|
			     MACB_BIT(ISR_TUND)	|
			     MACB_BIT(ISR_RLE)	|
			     MACB_BIT(TCOMP)	|
			     MACB_BIT(ISR_ROVR) |
			     MACB_BIT(HRESP));

	/* Disable Receiver and Transmitter */
	ctl = macb_readl(lp, NCR);
	macb_writel(lp, NCR, ctl & ~(MACB_BIT(TE) | MACB_BIT(RE)));

	/* Free resources. */
	at91ether_free_coherent(lp);
}

/* Open the ethernet interface */
static int at91ether_open(struct net_device *dev)
{
	struct macb *lp = netdev_priv(dev);
	u32 ctl;
	int ret;

	ret = pm_runtime_get_sync(&lp->pdev->dev);
	if (ret < 0) {
		pm_runtime_put_noidle(&lp->pdev->dev);
		return ret;
	}

	/* Clear internal statistics */
	ctl = macb_readl(lp, NCR);
	macb_writel(lp, NCR, ctl | MACB_BIT(CLRSTAT));

	macb_set_hwaddr(lp);

	ret = at91ether_start(lp);
	if (ret)
		goto pm_exit;

	ret = macb_phylink_connect(lp);
	if (ret)
		goto stop;

	netif_start_queue(dev);

	return 0;

stop:
	at91ether_stop(lp);
pm_exit:
	pm_runtime_put_sync(&lp->pdev->dev);
	return ret;
}

/* Close the interface */
static int at91ether_close(struct net_device *dev)
{
	struct macb *lp = netdev_priv(dev);

	netif_stop_queue(dev);

	phylink_stop(lp->phylink);
	phylink_disconnect_phy(lp->phylink);

	at91ether_stop(lp);

	return pm_runtime_put(&lp->pdev->dev);
}

/* Transmit packet */
static netdev_tx_t at91ether_start_xmit(struct sk_buff *skb,
					struct net_device *dev)
{
	struct macb *lp = netdev_priv(dev);

	if (macb_readl(lp, TSR) & MACB_BIT(RM9200_BNQ)) {
		int desc = 0;

		netif_stop_queue(dev);

		/* Store packet information (to free when Tx completed) */
		lp->rm9200_txq[desc].skb = skb;
		lp->rm9200_txq[desc].size = skb->len;
		lp->rm9200_txq[desc].mapping = dma_map_single(&lp->pdev->dev, skb->data,
							      skb->len, DMA_TO_DEVICE);
		if (dma_mapping_error(&lp->pdev->dev, lp->rm9200_txq[desc].mapping)) {
			dev_kfree_skb_any(skb);
			dev->stats.tx_dropped++;
			netdev_err(dev, "%s: DMA mapping error\n", __func__);
			return NETDEV_TX_OK;
		}

		/* Set address of the data in the Transmit Address register */
		macb_writel(lp, TAR, lp->rm9200_txq[desc].mapping);
		/* Set length of the packet in the Transmit Control register */
		macb_writel(lp, TCR, skb->len);

	} else {
		netdev_err(dev, "%s called, but device is busy!\n", __func__);
		return NETDEV_TX_BUSY;
	}

	return NETDEV_TX_OK;
}

/* Extract received frame from buffer descriptors and sent to upper layers.
 * (Called from interrupt context)
 */
static void at91ether_rx(struct net_device *dev)
{
	struct macb *lp = netdev_priv(dev);
	struct macb_queue *q = &lp->queues[0];
	struct macb_dma_desc *desc;
	unsigned char *p_recv;
	struct sk_buff *skb;
	unsigned int pktlen;

	desc = macb_rx_desc(q, q->rx_tail);
	while (desc->addr & MACB_BIT(RX_USED)) {
		p_recv = q->rx_buffers + q->rx_tail * AT91ETHER_MAX_RBUFF_SZ;
		pktlen = MACB_BF(RX_FRMLEN, desc->ctrl);
		skb = netdev_alloc_skb(dev, pktlen + 2);
		if (skb) {
			skb_reserve(skb, 2);
			skb_put_data(skb, p_recv, pktlen);

			skb->protocol = eth_type_trans(skb, dev);
			dev->stats.rx_packets++;
			dev->stats.rx_bytes += pktlen;
			netif_rx(skb);
		} else {
			dev->stats.rx_dropped++;
		}

		if (desc->ctrl & MACB_BIT(RX_MHASH_MATCH))
			dev->stats.multicast++;

		/* reset ownership bit */
		desc->addr &= ~MACB_BIT(RX_USED);

		/* wrap after last buffer */
		if (q->rx_tail == AT91ETHER_MAX_RX_DESCR - 1)
			q->rx_tail = 0;
		else
			q->rx_tail++;

		desc = macb_rx_desc(q, q->rx_tail);
	}
}

/* MAC interrupt handler */
static irqreturn_t at91ether_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = dev_id;
	struct macb *lp = netdev_priv(dev);
	u32 intstatus, ctl;
	unsigned int desc;

	/* MAC Interrupt Status register indicates what interrupts are pending.
	 * It is automatically cleared once read.
	 */
	intstatus = macb_readl(lp, ISR);

	/* Receive complete */
	if (intstatus & MACB_BIT(RCOMP))
		at91ether_rx(dev);

	/* Transmit complete */
	if (intstatus & MACB_BIT(TCOMP)) {
		/* The TCOM bit is set even if the transmission failed */
		if (intstatus & (MACB_BIT(ISR_TUND) | MACB_BIT(ISR_RLE)))
			dev->stats.tx_errors++;

		desc = 0;
		if (lp->rm9200_txq[desc].skb) {
			dev_consume_skb_irq(lp->rm9200_txq[desc].skb);
			lp->rm9200_txq[desc].skb = NULL;
			dma_unmap_single(&lp->pdev->dev, lp->rm9200_txq[desc].mapping,
					 lp->rm9200_txq[desc].size, DMA_TO_DEVICE);
			dev->stats.tx_packets++;
			dev->stats.tx_bytes += lp->rm9200_txq[desc].size;
		}
		netif_wake_queue(dev);
	}

	/* Work-around for EMAC Errata section 41.3.1 */
	if (intstatus & MACB_BIT(RXUBR)) {
		ctl = macb_readl(lp, NCR);
		macb_writel(lp, NCR, ctl & ~MACB_BIT(RE));
		wmb();
		macb_writel(lp, NCR, ctl | MACB_BIT(RE));
	}

	if (intstatus & MACB_BIT(ISR_ROVR))
		netdev_err(dev, "ROVR error\n");

	return IRQ_HANDLED;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static void at91ether_poll_controller(struct net_device *dev)
{
	unsigned long flags;

	local_irq_save(flags);
	at91ether_interrupt(dev->irq, dev);
	local_irq_restore(flags);
}
#endif

static const struct net_device_ops at91ether_netdev_ops = {
	.ndo_open		= at91ether_open,
	.ndo_stop		= at91ether_close,
	.ndo_start_xmit		= at91ether_start_xmit,
	.ndo_get_stats		= macb_get_stats,
	.ndo_set_rx_mode	= macb_set_rx_mode,
	.ndo_set_mac_address	= eth_mac_addr,
	.ndo_eth_ioctl		= macb_ioctl,
	.ndo_validate_addr	= eth_validate_addr,
#ifdef CONFIG_NET_POLL_CONTROLLER
	.ndo_poll_controller	= at91ether_poll_controller,
#endif
};

static int at91ether_clk_init(struct platform_device *pdev, struct clk **pclk,
			      struct clk **hclk, struct clk **tx_clk,
			      struct clk **rx_clk, struct clk **tsu_clk)
{
	int err;

	*hclk = NULL;
	*tx_clk = NULL;
	*rx_clk = NULL;
	*tsu_clk = NULL;

	*pclk = devm_clk_get(&pdev->dev, "ether_clk");
	if (IS_ERR(*pclk))
		return PTR_ERR(*pclk);

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

	return 0;
}

static int at91ether_init(struct platform_device *pdev)
{
	struct net_device *dev = platform_get_drvdata(pdev);
	struct macb *bp = netdev_priv(dev);
	int err;

	bp->queues[0].bp = bp;

	dev->netdev_ops = &at91ether_netdev_ops;
	dev->ethtool_ops = &macb_ethtool_ops;

	err = devm_request_irq(&pdev->dev, dev->irq, at91ether_interrupt,
			       0, dev->name, dev);
	if (err)
		return err;

	macb_writel(bp, NCR, 0);

	macb_writel(bp, NCFGR, MACB_BF(CLK, MACB_CLK_DIV32) | MACB_BIT(BIG));

	return 0;
}

static unsigned long fu540_macb_tx_recalc_rate(struct clk_hw *hw,
					       unsigned long parent_rate)
{
	return mgmt->rate;
}

static long fu540_macb_tx_round_rate(struct clk_hw *hw, unsigned long rate,
				     unsigned long *parent_rate)
{
	if (WARN_ON(rate < 2500000))
		return 2500000;
	else if (rate == 2500000)
		return 2500000;
	else if (WARN_ON(rate < 13750000))
		return 2500000;
	else if (WARN_ON(rate < 25000000))
		return 25000000;
	else if (rate == 25000000)
		return 25000000;
	else if (WARN_ON(rate < 75000000))
		return 25000000;
	else if (WARN_ON(rate < 125000000))
		return 125000000;
	else if (rate == 125000000)
		return 125000000;

	WARN_ON(rate > 125000000);

	return 125000000;
}

static int fu540_macb_tx_set_rate(struct clk_hw *hw, unsigned long rate,
				  unsigned long parent_rate)
{
	rate = fu540_macb_tx_round_rate(hw, rate, &parent_rate);
	if (rate != 125000000)
		iowrite32(1, mgmt->reg);
	else
		iowrite32(0, mgmt->reg);
	mgmt->rate = rate;

	return 0;
}

static const struct clk_ops fu540_c000_ops = {
	.recalc_rate = fu540_macb_tx_recalc_rate,
	.round_rate = fu540_macb_tx_round_rate,
	.set_rate = fu540_macb_tx_set_rate,
};

static int fu540_c000_clk_init(struct platform_device *pdev, struct clk **pclk,
			       struct clk **hclk, struct clk **tx_clk,
			       struct clk **rx_clk, struct clk **tsu_clk)
{
	struct clk_init_data init;
	int err = 0;

	err = macb_clk_init(pdev, pclk, hclk, tx_clk, rx_clk, tsu_clk);
	if (err)
		return err;

	mgmt = devm_kzalloc(&pdev->dev, sizeof(*mgmt), GFP_KERNEL);
	if (!mgmt) {
		err = -ENOMEM;
		goto err_disable_clks;
	}

	init.name = "sifive-gemgxl-mgmt";
	init.ops = &fu540_c000_ops;
	init.flags = 0;
	init.num_parents = 0;

	mgmt->rate = 0;
	mgmt->hw.init = &init;

	*tx_clk = devm_clk_register(&pdev->dev, &mgmt->hw);
	if (IS_ERR(*tx_clk)) {
		err = PTR_ERR(*tx_clk);
		goto err_disable_clks;
	}

	err = clk_prepare_enable(*tx_clk);
	if (err) {
		dev_err(&pdev->dev, "failed to enable tx_clk (%u)\n", err);
		*tx_clk = NULL;
		goto err_disable_clks;
	} else {
		dev_info(&pdev->dev, "Registered clk switch '%s'\n", init.name);
	}

	return 0;

err_disable_clks:
	macb_clks_disable(*pclk, *hclk, *tx_clk, *rx_clk, *tsu_clk);

	return err;
}

static int fu540_c000_init(struct platform_device *pdev)
{
	mgmt->reg = devm_platform_ioremap_resource(pdev, 1);
	if (IS_ERR(mgmt->reg))
		return PTR_ERR(mgmt->reg);

	return macb_init(pdev);
}

static const struct macb_usrio_config sama7g5_usrio = {
	.mii = 0,
	.rmii = 1,
	.rgmii = 2,
	.refclk = BIT(2),
	.hdfctlen = BIT(6),
};

static const struct macb_config fu540_c000_config = {
	.caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_JUMBO |
		MACB_CAPS_GEM_HAS_PTP,
	.dma_burst_length = 16,
	.clk_init = fu540_c000_clk_init,
	.init = fu540_c000_init,
	.jumbo_max_len = 10240,
	.usrio = &macb_default_usrio,
};

static const struct macb_config at91sam9260_config = {
	.caps = MACB_CAPS_USRIO_HAS_CLKEN | MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII,
	.clk_init = macb_clk_init,
	.init = macb_init,
	.usrio = &macb_default_usrio,
};

static const struct macb_config sama5d3macb_config = {
	.caps = MACB_CAPS_SG_DISABLED
	      | MACB_CAPS_USRIO_HAS_CLKEN | MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII,
	.clk_init = macb_clk_init,
	.init = macb_init,
	.usrio = &macb_default_usrio,
};

static const struct macb_config pc302gem_config = {
	.caps = MACB_CAPS_SG_DISABLED | MACB_CAPS_GIGABIT_MODE_AVAILABLE,
	.dma_burst_length = 16,
	.clk_init = macb_clk_init,
	.init = macb_init,
	.usrio = &macb_default_usrio,
};

static const struct macb_config sama5d2_config = {
	.caps = MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII,
	.dma_burst_length = 16,
	.clk_init = macb_clk_init,
	.init = macb_init,
	.usrio = &macb_default_usrio,
};

static const struct macb_config sama5d3_config = {
	.caps = MACB_CAPS_SG_DISABLED | MACB_CAPS_GIGABIT_MODE_AVAILABLE
	      | MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII | MACB_CAPS_JUMBO,
	.dma_burst_length = 16,
	.clk_init = macb_clk_init,
	.init = macb_init,
	.jumbo_max_len = 10240,
	.usrio = &macb_default_usrio,
};

static const struct macb_config sama5d4_config = {
	.caps = MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII,
	.dma_burst_length = 4,
	.clk_init = macb_clk_init,
	.init = macb_init,
	.usrio = &macb_default_usrio,
};

static const struct macb_config emac_config = {
	.caps = MACB_CAPS_NEEDS_RSTONUBR | MACB_CAPS_MACB_IS_EMAC,
	.clk_init = at91ether_clk_init,
	.init = at91ether_init,
	.usrio = &macb_default_usrio,
};

static const struct macb_config np4_config = {
	.caps = MACB_CAPS_USRIO_DISABLED,
	.clk_init = macb_clk_init,
	.init = macb_init,
	.usrio = &macb_default_usrio,
};

static const struct macb_config zynqmp_config = {
	.caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE |
			MACB_CAPS_JUMBO |
			MACB_CAPS_GEM_HAS_PTP | MACB_CAPS_BD_RD_PREFETCH,
	.dma_burst_length = 16,
	.clk_init = macb_clk_init,
	.init = macb_init,
	.jumbo_max_len = 10240,
	.usrio = &macb_default_usrio,
};

static const struct macb_config zynq_config = {
	.caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_NO_GIGABIT_HALF |
		MACB_CAPS_NEEDS_RSTONUBR,
	.dma_burst_length = 16,
	.clk_init = macb_clk_init,
	.init = macb_init,
	.usrio = &macb_default_usrio,
};

static const struct macb_config sama7g5_gem_config = {
	.caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_CLK_HW_CHG,
	.dma_burst_length = 16,
	.clk_init = macb_clk_init,
	.init = macb_init,
	.usrio = &sama7g5_usrio,
};

static const struct macb_config sama7g5_emac_config = {
	.caps = MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII | MACB_CAPS_USRIO_HAS_CLKEN,
	.dma_burst_length = 16,
	.clk_init = macb_clk_init,
	.init = macb_init,
	.usrio = &sama7g5_usrio,
};

static const struct of_device_id macb_dt_ids[] = {
	{ .compatible = "cdns,at32ap7000-macb" },
	{ .compatible = "cdns,at91sam9260-macb", .data = &at91sam9260_config },
	{ .compatible = "cdns,macb" },
	{ .compatible = "cdns,np4-macb", .data = &np4_config },
	{ .compatible = "cdns,pc302-gem", .data = &pc302gem_config },
	{ .compatible = "cdns,gem", .data = &pc302gem_config },
	{ .compatible = "cdns,sam9x60-macb", .data = &at91sam9260_config },
	{ .compatible = "atmel,sama5d2-gem", .data = &sama5d2_config },
	{ .compatible = "atmel,sama5d3-gem", .data = &sama5d3_config },
	{ .compatible = "atmel,sama5d3-macb", .data = &sama5d3macb_config },
	{ .compatible = "atmel,sama5d4-gem", .data = &sama5d4_config },
	{ .compatible = "cdns,at91rm9200-emac", .data = &emac_config },
	{ .compatible = "cdns,emac", .data = &emac_config },
	{ .compatible = "cdns,zynqmp-gem", .data = &zynqmp_config},
	{ .compatible = "cdns,zynq-gem", .data = &zynq_config },
	{ .compatible = "sifive,fu540-c000-gem", .data = &fu540_c000_config },
	{ .compatible = "microchip,sama7g5-gem", .data = &sama7g5_gem_config },
	{ .compatible = "microchip,sama7g5-emac", .data = &sama7g5_emac_config },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, macb_dt_ids);
#endif /* CONFIG_OF */

static const struct macb_config default_gem_config = {
	.caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE |
			MACB_CAPS_JUMBO |
			MACB_CAPS_GEM_HAS_PTP,
	.dma_burst_length = 16,
	.clk_init = macb_clk_init,
	.init = macb_init,
	.usrio = &macb_default_usrio,
	.jumbo_max_len = 10240,
};

static int macb_probe(struct platform_device *pdev)
{
	const struct macb_config *macb_config = &default_gem_config;
	int (*clk_init)(struct platform_device *, struct clk **,
			struct clk **, struct clk **,  struct clk **,
			struct clk **) = macb_config->clk_init;
	int (*init)(struct platform_device *) = macb_config->init;
	struct device_node *np = pdev->dev.of_node;
	struct clk *pclk, *hclk = NULL, *tx_clk = NULL, *rx_clk = NULL;
	struct clk *tsu_clk = NULL;
	unsigned int queue_mask, num_queues;
	bool native_io;
	phy_interface_t interface;
	struct net_device *dev;
	struct resource *regs;
	void __iomem *mem;
	struct macb *bp;
	int err, val;

	mem = devm_platform_get_and_ioremap_resource(pdev, 0, &regs);
	if (IS_ERR(mem))
		return PTR_ERR(mem);

	if (np) {
		const struct of_device_id *match;

		match = of_match_node(macb_dt_ids, np);
		if (match && match->data) {
			macb_config = match->data;
			clk_init = macb_config->clk_init;
			init = macb_config->init;
		}
	}

	err = clk_init(pdev, &pclk, &hclk, &tx_clk, &rx_clk, &tsu_clk);
	if (err)
		return err;

	pm_runtime_set_autosuspend_delay(&pdev->dev, MACB_PM_TIMEOUT);
	pm_runtime_use_autosuspend(&pdev->dev);
	pm_runtime_get_noresume(&pdev->dev);
	pm_runtime_set_active(&pdev->dev);
	pm_runtime_enable(&pdev->dev);
	native_io = hw_is_native_io(mem);

	macb_probe_queues(mem, native_io, &queue_mask, &num_queues);
	dev = alloc_etherdev_mq(sizeof(*bp), num_queues);
	if (!dev) {
		err = -ENOMEM;
		goto err_disable_clocks;
	}

	dev->base_addr = regs->start;

	SET_NETDEV_DEV(dev, &pdev->dev);

	bp = netdev_priv(dev);
	bp->pdev = pdev;
	bp->dev = dev;
	bp->regs = mem;
	bp->native_io = native_io;
	if (native_io) {
		bp->macb_reg_readl = hw_readl_native;
		bp->macb_reg_writel = hw_writel_native;
	} else {
		bp->macb_reg_readl = hw_readl;
		bp->macb_reg_writel = hw_writel;
	}
	bp->num_queues = num_queues;
	bp->queue_mask = queue_mask;
	if (macb_config)
		bp->dma_burst_length = macb_config->dma_burst_length;
	bp->pclk = pclk;
	bp->hclk = hclk;
	bp->tx_clk = tx_clk;
	bp->rx_clk = rx_clk;
	bp->tsu_clk = tsu_clk;
	if (macb_config)
		bp->jumbo_max_len = macb_config->jumbo_max_len;

	bp->wol = 0;
	if (of_get_property(np, "magic-packet", NULL))
		bp->wol |= MACB_WOL_HAS_MAGIC_PACKET;
	device_set_wakeup_capable(&pdev->dev, bp->wol & MACB_WOL_HAS_MAGIC_PACKET);

	bp->usrio = macb_config->usrio;

	spin_lock_init(&bp->lock);

	/* setup capabilities */
	macb_configure_caps(bp, macb_config);

#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
	if (GEM_BFEXT(DAW64, gem_readl(bp, DCFG6))) {
		dma_set_mask(&pdev->dev, DMA_BIT_MASK(44));
		bp->hw_dma_cap |= HW_DMA_CAP_64B;
	}
#endif
	platform_set_drvdata(pdev, dev);

	dev->irq = platform_get_irq(pdev, 0);
	if (dev->irq < 0) {
		err = dev->irq;
		goto err_out_free_netdev;
	}

	/* MTU range: 68 - 1500 or 10240 */
	dev->min_mtu = GEM_MTU_MIN_SIZE;
	if (bp->caps & MACB_CAPS_JUMBO)
		dev->max_mtu = gem_readl(bp, JML) - ETH_HLEN - ETH_FCS_LEN;
	else
		dev->max_mtu = ETH_DATA_LEN;

	if (bp->caps & MACB_CAPS_BD_RD_PREFETCH) {
		val = GEM_BFEXT(RXBD_RDBUFF, gem_readl(bp, DCFG10));
		if (val)
			bp->rx_bd_rd_prefetch = (2 << (val - 1)) *
						macb_dma_desc_get_size(bp);

		val = GEM_BFEXT(TXBD_RDBUFF, gem_readl(bp, DCFG10));
		if (val)
			bp->tx_bd_rd_prefetch = (2 << (val - 1)) *
						macb_dma_desc_get_size(bp);
	}

	bp->rx_intr_mask = MACB_RX_INT_FLAGS;
	if (bp->caps & MACB_CAPS_NEEDS_RSTONUBR)
		bp->rx_intr_mask |= MACB_BIT(RXUBR);

	err = of_get_mac_address(np, bp->dev->dev_addr);
	if (err == -EPROBE_DEFER)
		goto err_out_free_netdev;
	else if (err)
		macb_get_hwaddr(bp);

	err = of_get_phy_mode(np, &interface);
	if (err)
		/* not found in DT, MII by default */
		bp->phy_interface = PHY_INTERFACE_MODE_MII;
	else
		bp->phy_interface = interface;

	/* IP specific init */
	err = init(pdev);
	if (err)
		goto err_out_free_netdev;

	err = macb_mii_init(bp);
	if (err)
		goto err_out_free_netdev;

	netif_carrier_off(dev);

	err = register_netdev(dev);
	if (err) {
		dev_err(&pdev->dev, "Cannot register net device, aborting.\n");
		goto err_out_unregister_mdio;
	}

	tasklet_setup(&bp->hresp_err_tasklet, macb_hresp_error_task);

	netdev_info(dev, "Cadence %s rev 0x%08x at 0x%08lx irq %d (%pM)\n",
		    macb_is_gem(bp) ? "GEM" : "MACB", macb_readl(bp, MID),
		    dev->base_addr, dev->irq, dev->dev_addr);

	pm_runtime_mark_last_busy(&bp->pdev->dev);
	pm_runtime_put_autosuspend(&bp->pdev->dev);

	return 0;

err_out_unregister_mdio:
	mdiobus_unregister(bp->mii_bus);
	mdiobus_free(bp->mii_bus);

err_out_free_netdev:
	free_netdev(dev);

err_disable_clocks:
	macb_clks_disable(pclk, hclk, tx_clk, rx_clk, tsu_clk);
	pm_runtime_disable(&pdev->dev);
	pm_runtime_set_suspended(&pdev->dev);
	pm_runtime_dont_use_autosuspend(&pdev->dev);

	return err;
}

static int macb_remove(struct platform_device *pdev)
{
	struct net_device *dev;
	struct macb *bp;

	dev = platform_get_drvdata(pdev);

	if (dev) {
		bp = netdev_priv(dev);
		mdiobus_unregister(bp->mii_bus);
		mdiobus_free(bp->mii_bus);

		unregister_netdev(dev);
		tasklet_kill(&bp->hresp_err_tasklet);
		pm_runtime_disable(&pdev->dev);
		pm_runtime_dont_use_autosuspend(&pdev->dev);
		if (!pm_runtime_suspended(&pdev->dev)) {
			macb_clks_disable(bp->pclk, bp->hclk, bp->tx_clk,
					  bp->rx_clk, bp->tsu_clk);
			pm_runtime_set_suspended(&pdev->dev);
		}
		phylink_destroy(bp->phylink);
		free_netdev(dev);
	}

	return 0;
}

static int __maybe_unused macb_suspend(struct device *dev)
{
	struct net_device *netdev = dev_get_drvdata(dev);
	struct macb *bp = netdev_priv(netdev);
	struct macb_queue *queue;
	unsigned long flags;
	unsigned int q;
	int err;

	if (!netif_running(netdev))
		return 0;

	if (bp->wol & MACB_WOL_ENABLED) {
		spin_lock_irqsave(&bp->lock, flags);
		/* Flush all status bits */
		macb_writel(bp, TSR, -1);
		macb_writel(bp, RSR, -1);
		for (q = 0, queue = bp->queues; q < bp->num_queues;
		     ++q, ++queue) {
			/* Disable all interrupts */
			queue_writel(queue, IDR, -1);
			queue_readl(queue, ISR);
			if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
				queue_writel(queue, ISR, -1);
		}
		/* Change interrupt handler and
		 * Enable WoL IRQ on queue 0
		 */
		devm_free_irq(dev, bp->queues[0].irq, bp->queues);
		if (macb_is_gem(bp)) {
			err = devm_request_irq(dev, bp->queues[0].irq, gem_wol_interrupt,
					       IRQF_SHARED, netdev->name, bp->queues);
			if (err) {
				dev_err(dev,
					"Unable to request IRQ %d (error %d)\n",
					bp->queues[0].irq, err);
				spin_unlock_irqrestore(&bp->lock, flags);
				return err;
			}
			queue_writel(bp->queues, IER, GEM_BIT(WOL));
			gem_writel(bp, WOL, MACB_BIT(MAG));
		} else {
			err = devm_request_irq(dev, bp->queues[0].irq, macb_wol_interrupt,
					       IRQF_SHARED, netdev->name, bp->queues);
			if (err) {
				dev_err(dev,
					"Unable to request IRQ %d (error %d)\n",
					bp->queues[0].irq, err);
				spin_unlock_irqrestore(&bp->lock, flags);
				return err;
			}
			queue_writel(bp->queues, IER, MACB_BIT(WOL));
			macb_writel(bp, WOL, MACB_BIT(MAG));
		}
		spin_unlock_irqrestore(&bp->lock, flags);

		enable_irq_wake(bp->queues[0].irq);
	}

	netif_device_detach(netdev);
	for (q = 0, queue = bp->queues; q < bp->num_queues;
	     ++q, ++queue)
		napi_disable(&queue->napi);

	if (!(bp->wol & MACB_WOL_ENABLED)) {
		rtnl_lock();
		phylink_stop(bp->phylink);
		rtnl_unlock();
		spin_lock_irqsave(&bp->lock, flags);
		macb_reset_hw(bp);
		spin_unlock_irqrestore(&bp->lock, flags);
	}

	if (!(bp->caps & MACB_CAPS_USRIO_DISABLED))
		bp->pm_data.usrio = macb_or_gem_readl(bp, USRIO);

	if (netdev->hw_features & NETIF_F_NTUPLE)
		bp->pm_data.scrt2 = gem_readl_n(bp, ETHT, SCRT2_ETHT);

	if (bp->ptp_info)
		bp->ptp_info->ptp_remove(netdev);
	if (!device_may_wakeup(dev))
		pm_runtime_force_suspend(dev);

	return 0;
}

static int __maybe_unused macb_resume(struct device *dev)
{
	struct net_device *netdev = dev_get_drvdata(dev);
	struct macb *bp = netdev_priv(netdev);
	struct macb_queue *queue;
	unsigned long flags;
	unsigned int q;
	int err;

	if (!netif_running(netdev))
		return 0;

	if (!device_may_wakeup(dev))
		pm_runtime_force_resume(dev);

	if (bp->wol & MACB_WOL_ENABLED) {
		spin_lock_irqsave(&bp->lock, flags);
		/* Disable WoL */
		if (macb_is_gem(bp)) {
			queue_writel(bp->queues, IDR, GEM_BIT(WOL));
			gem_writel(bp, WOL, 0);
		} else {
			queue_writel(bp->queues, IDR, MACB_BIT(WOL));
			macb_writel(bp, WOL, 0);
		}
		/* Clear ISR on queue 0 */
		queue_readl(bp->queues, ISR);
		if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
			queue_writel(bp->queues, ISR, -1);
		/* Replace interrupt handler on queue 0 */
		devm_free_irq(dev, bp->queues[0].irq, bp->queues);
		err = devm_request_irq(dev, bp->queues[0].irq, macb_interrupt,
				       IRQF_SHARED, netdev->name, bp->queues);
		if (err) {
			dev_err(dev,
				"Unable to request IRQ %d (error %d)\n",
				bp->queues[0].irq, err);
			spin_unlock_irqrestore(&bp->lock, flags);
			return err;
		}
		spin_unlock_irqrestore(&bp->lock, flags);

		disable_irq_wake(bp->queues[0].irq);

		/* Now make sure we disable phy before moving
		 * to common restore path
		 */
		rtnl_lock();
		phylink_stop(bp->phylink);
		rtnl_unlock();
	}

	for (q = 0, queue = bp->queues; q < bp->num_queues;
	     ++q, ++queue)
		napi_enable(&queue->napi);

	if (netdev->hw_features & NETIF_F_NTUPLE)
		gem_writel_n(bp, ETHT, SCRT2_ETHT, bp->pm_data.scrt2);

	if (!(bp->caps & MACB_CAPS_USRIO_DISABLED))
		macb_or_gem_writel(bp, USRIO, bp->pm_data.usrio);

	macb_writel(bp, NCR, MACB_BIT(MPE));
	macb_init_hw(bp);
	macb_set_rx_mode(netdev);
	macb_restore_features(bp);
	rtnl_lock();
	phylink_start(bp->phylink);
	rtnl_unlock();

	netif_device_attach(netdev);
	if (bp->ptp_info)
		bp->ptp_info->ptp_init(netdev);

	return 0;
}

static int __maybe_unused macb_runtime_suspend(struct device *dev)
{
	struct net_device *netdev = dev_get_drvdata(dev);
	struct macb *bp = netdev_priv(netdev);

	if (!(device_may_wakeup(dev)))
		macb_clks_disable(bp->pclk, bp->hclk, bp->tx_clk, bp->rx_clk, bp->tsu_clk);
	else
		macb_clks_disable(NULL, NULL, NULL, NULL, bp->tsu_clk);

	return 0;
}

static int __maybe_unused macb_runtime_resume(struct device *dev)
{
	struct net_device *netdev = dev_get_drvdata(dev);
	struct macb *bp = netdev_priv(netdev);

	if (!(device_may_wakeup(dev))) {
		clk_prepare_enable(bp->pclk);
		clk_prepare_enable(bp->hclk);
		clk_prepare_enable(bp->tx_clk);
		clk_prepare_enable(bp->rx_clk);
	}
	clk_prepare_enable(bp->tsu_clk);

	return 0;
}

static const struct dev_pm_ops macb_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(macb_suspend, macb_resume)
	SET_RUNTIME_PM_OPS(macb_runtime_suspend, macb_runtime_resume, NULL)
};

static struct platform_driver macb_driver = {
	.probe		= macb_probe,
	.remove		= macb_remove,
	.driver		= {
		.name		= "macb",
		.of_match_table	= of_match_ptr(macb_dt_ids),
		.pm	= &macb_pm_ops,
	},
};

module_platform_driver(macb_driver);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Cadence MACB/GEM Ethernet driver");
MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
MODULE_ALIAS("platform:macb");