summaryrefslogtreecommitdiff
path: root/drivers/mtd/nand/raw/brcmnand/brcmnand.c
blob: 4b90d5b380c2503fc88426890f719bd018d6d2f7 (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
/*
 * Copyright © 2010-2015 Broadcom Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 */

#include <linux/clk.h>
#include <linux/version.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/completion.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/dma-mapping.h>
#include <linux/ioport.h>
#include <linux/bug.h>
#include <linux/kernel.h>
#include <linux/bitops.h>
#include <linux/mm.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/rawnand.h>
#include <linux/mtd/partitions.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/log2.h>

#include "brcmnand.h"

/*
 * This flag controls if WP stays on between erase/write commands to mitigate
 * flash corruption due to power glitches. Values:
 * 0: NAND_WP is not used or not available
 * 1: NAND_WP is set by default, cleared for erase/write operations
 * 2: NAND_WP is always cleared
 */
static int wp_on = 1;
module_param(wp_on, int, 0444);

/***********************************************************************
 * Definitions
 ***********************************************************************/

#define DRV_NAME			"brcmnand"

#define CMD_NULL			0x00
#define CMD_PAGE_READ			0x01
#define CMD_SPARE_AREA_READ		0x02
#define CMD_STATUS_READ			0x03
#define CMD_PROGRAM_PAGE		0x04
#define CMD_PROGRAM_SPARE_AREA		0x05
#define CMD_COPY_BACK			0x06
#define CMD_DEVICE_ID_READ		0x07
#define CMD_BLOCK_ERASE			0x08
#define CMD_FLASH_RESET			0x09
#define CMD_BLOCKS_LOCK			0x0a
#define CMD_BLOCKS_LOCK_DOWN		0x0b
#define CMD_BLOCKS_UNLOCK		0x0c
#define CMD_READ_BLOCKS_LOCK_STATUS	0x0d
#define CMD_PARAMETER_READ		0x0e
#define CMD_PARAMETER_CHANGE_COL	0x0f
#define CMD_LOW_LEVEL_OP		0x10

struct brcm_nand_dma_desc {
	u32 next_desc;
	u32 next_desc_ext;
	u32 cmd_irq;
	u32 dram_addr;
	u32 dram_addr_ext;
	u32 tfr_len;
	u32 total_len;
	u32 flash_addr;
	u32 flash_addr_ext;
	u32 cs;
	u32 pad2[5];
	u32 status_valid;
} __packed;

/* Bitfields for brcm_nand_dma_desc::status_valid */
#define FLASH_DMA_ECC_ERROR	(1 << 8)
#define FLASH_DMA_CORR_ERROR	(1 << 9)

/* 512B flash cache in the NAND controller HW */
#define FC_SHIFT		9U
#define FC_BYTES		512U
#define FC_WORDS		(FC_BYTES >> 2)

#define BRCMNAND_MIN_PAGESIZE	512
#define BRCMNAND_MIN_BLOCKSIZE	(8 * 1024)
#define BRCMNAND_MIN_DEVSIZE	(4ULL * 1024 * 1024)

#define NAND_CTRL_RDY			(INTFC_CTLR_READY | INTFC_FLASH_READY)
#define NAND_POLL_STATUS_TIMEOUT_MS	100

/* Controller feature flags */
enum {
	BRCMNAND_HAS_1K_SECTORS			= BIT(0),
	BRCMNAND_HAS_PREFETCH			= BIT(1),
	BRCMNAND_HAS_CACHE_MODE			= BIT(2),
	BRCMNAND_HAS_WP				= BIT(3),
};

struct brcmnand_controller {
	struct device		*dev;
	struct nand_controller	controller;
	void __iomem		*nand_base;
	void __iomem		*nand_fc; /* flash cache */
	void __iomem		*flash_dma_base;
	unsigned int		irq;
	unsigned int		dma_irq;
	int			nand_version;

	/* Some SoCs provide custom interrupt status register(s) */
	struct brcmnand_soc	*soc;

	/* Some SoCs have a gateable clock for the controller */
	struct clk		*clk;

	int			cmd_pending;
	bool			dma_pending;
	struct completion	done;
	struct completion	dma_done;

	/* List of NAND hosts (one for each chip-select) */
	struct list_head host_list;

	struct brcm_nand_dma_desc *dma_desc;
	dma_addr_t		dma_pa;

	/* in-memory cache of the FLASH_CACHE, used only for some commands */
	u8			flash_cache[FC_BYTES];

	/* Controller revision details */
	const u16		*reg_offsets;
	unsigned int		reg_spacing; /* between CS1, CS2, ... regs */
	const u8		*cs_offsets; /* within each chip-select */
	const u8		*cs0_offsets; /* within CS0, if different */
	unsigned int		max_block_size;
	const unsigned int	*block_sizes;
	unsigned int		max_page_size;
	const unsigned int	*page_sizes;
	unsigned int		max_oob;
	u32			features;

	/* for low-power standby/resume only */
	u32			nand_cs_nand_select;
	u32			nand_cs_nand_xor;
	u32			corr_stat_threshold;
	u32			flash_dma_mode;
};

struct brcmnand_cfg {
	u64			device_size;
	unsigned int		block_size;
	unsigned int		page_size;
	unsigned int		spare_area_size;
	unsigned int		device_width;
	unsigned int		col_adr_bytes;
	unsigned int		blk_adr_bytes;
	unsigned int		ful_adr_bytes;
	unsigned int		sector_size_1k;
	unsigned int		ecc_level;
	/* use for low-power standby/resume only */
	u32			acc_control;
	u32			config;
	u32			config_ext;
	u32			timing_1;
	u32			timing_2;
};

struct brcmnand_host {
	struct list_head	node;

	struct nand_chip	chip;
	struct platform_device	*pdev;
	int			cs;

	unsigned int		last_cmd;
	unsigned int		last_byte;
	u64			last_addr;
	struct brcmnand_cfg	hwcfg;
	struct brcmnand_controller *ctrl;
};

enum brcmnand_reg {
	BRCMNAND_CMD_START = 0,
	BRCMNAND_CMD_EXT_ADDRESS,
	BRCMNAND_CMD_ADDRESS,
	BRCMNAND_INTFC_STATUS,
	BRCMNAND_CS_SELECT,
	BRCMNAND_CS_XOR,
	BRCMNAND_LL_OP,
	BRCMNAND_CS0_BASE,
	BRCMNAND_CS1_BASE,		/* CS1 regs, if non-contiguous */
	BRCMNAND_CORR_THRESHOLD,
	BRCMNAND_CORR_THRESHOLD_EXT,
	BRCMNAND_UNCORR_COUNT,
	BRCMNAND_CORR_COUNT,
	BRCMNAND_CORR_EXT_ADDR,
	BRCMNAND_CORR_ADDR,
	BRCMNAND_UNCORR_EXT_ADDR,
	BRCMNAND_UNCORR_ADDR,
	BRCMNAND_SEMAPHORE,
	BRCMNAND_ID,
	BRCMNAND_ID_EXT,
	BRCMNAND_LL_RDATA,
	BRCMNAND_OOB_READ_BASE,
	BRCMNAND_OOB_READ_10_BASE,	/* offset 0x10, if non-contiguous */
	BRCMNAND_OOB_WRITE_BASE,
	BRCMNAND_OOB_WRITE_10_BASE,	/* offset 0x10, if non-contiguous */
	BRCMNAND_FC_BASE,
};

/* BRCMNAND v4.0 */
static const u16 brcmnand_regs_v40[] = {
	[BRCMNAND_CMD_START]		=  0x04,
	[BRCMNAND_CMD_EXT_ADDRESS]	=  0x08,
	[BRCMNAND_CMD_ADDRESS]		=  0x0c,
	[BRCMNAND_INTFC_STATUS]		=  0x6c,
	[BRCMNAND_CS_SELECT]		=  0x14,
	[BRCMNAND_CS_XOR]		=  0x18,
	[BRCMNAND_LL_OP]		= 0x178,
	[BRCMNAND_CS0_BASE]		=  0x40,
	[BRCMNAND_CS1_BASE]		=  0xd0,
	[BRCMNAND_CORR_THRESHOLD]	=  0x84,
	[BRCMNAND_CORR_THRESHOLD_EXT]	=     0,
	[BRCMNAND_UNCORR_COUNT]		=     0,
	[BRCMNAND_CORR_COUNT]		=     0,
	[BRCMNAND_CORR_EXT_ADDR]	=  0x70,
	[BRCMNAND_CORR_ADDR]		=  0x74,
	[BRCMNAND_UNCORR_EXT_ADDR]	=  0x78,
	[BRCMNAND_UNCORR_ADDR]		=  0x7c,
	[BRCMNAND_SEMAPHORE]		=  0x58,
	[BRCMNAND_ID]			=  0x60,
	[BRCMNAND_ID_EXT]		=  0x64,
	[BRCMNAND_LL_RDATA]		= 0x17c,
	[BRCMNAND_OOB_READ_BASE]	=  0x20,
	[BRCMNAND_OOB_READ_10_BASE]	= 0x130,
	[BRCMNAND_OOB_WRITE_BASE]	=  0x30,
	[BRCMNAND_OOB_WRITE_10_BASE]	=     0,
	[BRCMNAND_FC_BASE]		= 0x200,
};

/* BRCMNAND v5.0 */
static const u16 brcmnand_regs_v50[] = {
	[BRCMNAND_CMD_START]		=  0x04,
	[BRCMNAND_CMD_EXT_ADDRESS]	=  0x08,
	[BRCMNAND_CMD_ADDRESS]		=  0x0c,
	[BRCMNAND_INTFC_STATUS]		=  0x6c,
	[BRCMNAND_CS_SELECT]		=  0x14,
	[BRCMNAND_CS_XOR]		=  0x18,
	[BRCMNAND_LL_OP]		= 0x178,
	[BRCMNAND_CS0_BASE]		=  0x40,
	[BRCMNAND_CS1_BASE]		=  0xd0,
	[BRCMNAND_CORR_THRESHOLD]	=  0x84,
	[BRCMNAND_CORR_THRESHOLD_EXT]	=     0,
	[BRCMNAND_UNCORR_COUNT]		=     0,
	[BRCMNAND_CORR_COUNT]		=     0,
	[BRCMNAND_CORR_EXT_ADDR]	=  0x70,
	[BRCMNAND_CORR_ADDR]		=  0x74,
	[BRCMNAND_UNCORR_EXT_ADDR]	=  0x78,
	[BRCMNAND_UNCORR_ADDR]		=  0x7c,
	[BRCMNAND_SEMAPHORE]		=  0x58,
	[BRCMNAND_ID]			=  0x60,
	[BRCMNAND_ID_EXT]		=  0x64,
	[BRCMNAND_LL_RDATA]		= 0x17c,
	[BRCMNAND_OOB_READ_BASE]	=  0x20,
	[BRCMNAND_OOB_READ_10_BASE]	= 0x130,
	[BRCMNAND_OOB_WRITE_BASE]	=  0x30,
	[BRCMNAND_OOB_WRITE_10_BASE]	= 0x140,
	[BRCMNAND_FC_BASE]		= 0x200,
};

/* BRCMNAND v6.0 - v7.1 */
static const u16 brcmnand_regs_v60[] = {
	[BRCMNAND_CMD_START]		=  0x04,
	[BRCMNAND_CMD_EXT_ADDRESS]	=  0x08,
	[BRCMNAND_CMD_ADDRESS]		=  0x0c,
	[BRCMNAND_INTFC_STATUS]		=  0x14,
	[BRCMNAND_CS_SELECT]		=  0x18,
	[BRCMNAND_CS_XOR]		=  0x1c,
	[BRCMNAND_LL_OP]		=  0x20,
	[BRCMNAND_CS0_BASE]		=  0x50,
	[BRCMNAND_CS1_BASE]		=     0,
	[BRCMNAND_CORR_THRESHOLD]	=  0xc0,
	[BRCMNAND_CORR_THRESHOLD_EXT]	=  0xc4,
	[BRCMNAND_UNCORR_COUNT]		=  0xfc,
	[BRCMNAND_CORR_COUNT]		= 0x100,
	[BRCMNAND_CORR_EXT_ADDR]	= 0x10c,
	[BRCMNAND_CORR_ADDR]		= 0x110,
	[BRCMNAND_UNCORR_EXT_ADDR]	= 0x114,
	[BRCMNAND_UNCORR_ADDR]		= 0x118,
	[BRCMNAND_SEMAPHORE]		= 0x150,
	[BRCMNAND_ID]			= 0x194,
	[BRCMNAND_ID_EXT]		= 0x198,
	[BRCMNAND_LL_RDATA]		= 0x19c,
	[BRCMNAND_OOB_READ_BASE]	= 0x200,
	[BRCMNAND_OOB_READ_10_BASE]	=     0,
	[BRCMNAND_OOB_WRITE_BASE]	= 0x280,
	[BRCMNAND_OOB_WRITE_10_BASE]	=     0,
	[BRCMNAND_FC_BASE]		= 0x400,
};

/* BRCMNAND v7.1 */
static const u16 brcmnand_regs_v71[] = {
	[BRCMNAND_CMD_START]		=  0x04,
	[BRCMNAND_CMD_EXT_ADDRESS]	=  0x08,
	[BRCMNAND_CMD_ADDRESS]		=  0x0c,
	[BRCMNAND_INTFC_STATUS]		=  0x14,
	[BRCMNAND_CS_SELECT]		=  0x18,
	[BRCMNAND_CS_XOR]		=  0x1c,
	[BRCMNAND_LL_OP]		=  0x20,
	[BRCMNAND_CS0_BASE]		=  0x50,
	[BRCMNAND_CS1_BASE]		=     0,
	[BRCMNAND_CORR_THRESHOLD]	=  0xdc,
	[BRCMNAND_CORR_THRESHOLD_EXT]	=  0xe0,
	[BRCMNAND_UNCORR_COUNT]		=  0xfc,
	[BRCMNAND_CORR_COUNT]		= 0x100,
	[BRCMNAND_CORR_EXT_ADDR]	= 0x10c,
	[BRCMNAND_CORR_ADDR]		= 0x110,
	[BRCMNAND_UNCORR_EXT_ADDR]	= 0x114,
	[BRCMNAND_UNCORR_ADDR]		= 0x118,
	[BRCMNAND_SEMAPHORE]		= 0x150,
	[BRCMNAND_ID]			= 0x194,
	[BRCMNAND_ID_EXT]		= 0x198,
	[BRCMNAND_LL_RDATA]		= 0x19c,
	[BRCMNAND_OOB_READ_BASE]	= 0x200,
	[BRCMNAND_OOB_READ_10_BASE]	=     0,
	[BRCMNAND_OOB_WRITE_BASE]	= 0x280,
	[BRCMNAND_OOB_WRITE_10_BASE]	=     0,
	[BRCMNAND_FC_BASE]		= 0x400,
};

/* BRCMNAND v7.2 */
static const u16 brcmnand_regs_v72[] = {
	[BRCMNAND_CMD_START]		=  0x04,
	[BRCMNAND_CMD_EXT_ADDRESS]	=  0x08,
	[BRCMNAND_CMD_ADDRESS]		=  0x0c,
	[BRCMNAND_INTFC_STATUS]		=  0x14,
	[BRCMNAND_CS_SELECT]		=  0x18,
	[BRCMNAND_CS_XOR]		=  0x1c,
	[BRCMNAND_LL_OP]		=  0x20,
	[BRCMNAND_CS0_BASE]		=  0x50,
	[BRCMNAND_CS1_BASE]		=     0,
	[BRCMNAND_CORR_THRESHOLD]	=  0xdc,
	[BRCMNAND_CORR_THRESHOLD_EXT]	=  0xe0,
	[BRCMNAND_UNCORR_COUNT]		=  0xfc,
	[BRCMNAND_CORR_COUNT]		= 0x100,
	[BRCMNAND_CORR_EXT_ADDR]	= 0x10c,
	[BRCMNAND_CORR_ADDR]		= 0x110,
	[BRCMNAND_UNCORR_EXT_ADDR]	= 0x114,
	[BRCMNAND_UNCORR_ADDR]		= 0x118,
	[BRCMNAND_SEMAPHORE]		= 0x150,
	[BRCMNAND_ID]			= 0x194,
	[BRCMNAND_ID_EXT]		= 0x198,
	[BRCMNAND_LL_RDATA]		= 0x19c,
	[BRCMNAND_OOB_READ_BASE]	= 0x200,
	[BRCMNAND_OOB_READ_10_BASE]	=     0,
	[BRCMNAND_OOB_WRITE_BASE]	= 0x400,
	[BRCMNAND_OOB_WRITE_10_BASE]	=     0,
	[BRCMNAND_FC_BASE]		= 0x600,
};

enum brcmnand_cs_reg {
	BRCMNAND_CS_CFG_EXT = 0,
	BRCMNAND_CS_CFG,
	BRCMNAND_CS_ACC_CONTROL,
	BRCMNAND_CS_TIMING1,
	BRCMNAND_CS_TIMING2,
};

/* Per chip-select offsets for v7.1 */
static const u8 brcmnand_cs_offsets_v71[] = {
	[BRCMNAND_CS_ACC_CONTROL]	= 0x00,
	[BRCMNAND_CS_CFG_EXT]		= 0x04,
	[BRCMNAND_CS_CFG]		= 0x08,
	[BRCMNAND_CS_TIMING1]		= 0x0c,
	[BRCMNAND_CS_TIMING2]		= 0x10,
};

/* Per chip-select offsets for pre v7.1, except CS0 on <= v5.0 */
static const u8 brcmnand_cs_offsets[] = {
	[BRCMNAND_CS_ACC_CONTROL]	= 0x00,
	[BRCMNAND_CS_CFG_EXT]		= 0x04,
	[BRCMNAND_CS_CFG]		= 0x04,
	[BRCMNAND_CS_TIMING1]		= 0x08,
	[BRCMNAND_CS_TIMING2]		= 0x0c,
};

/* Per chip-select offset for <= v5.0 on CS0 only */
static const u8 brcmnand_cs_offsets_cs0[] = {
	[BRCMNAND_CS_ACC_CONTROL]	= 0x00,
	[BRCMNAND_CS_CFG_EXT]		= 0x08,
	[BRCMNAND_CS_CFG]		= 0x08,
	[BRCMNAND_CS_TIMING1]		= 0x10,
	[BRCMNAND_CS_TIMING2]		= 0x14,
};

/*
 * Bitfields for the CFG and CFG_EXT registers. Pre-v7.1 controllers only had
 * one config register, but once the bitfields overflowed, newer controllers
 * (v7.1 and newer) added a CFG_EXT register and shuffled a few fields around.
 */
enum {
	CFG_BLK_ADR_BYTES_SHIFT		= 8,
	CFG_COL_ADR_BYTES_SHIFT		= 12,
	CFG_FUL_ADR_BYTES_SHIFT		= 16,
	CFG_BUS_WIDTH_SHIFT		= 23,
	CFG_BUS_WIDTH			= BIT(CFG_BUS_WIDTH_SHIFT),
	CFG_DEVICE_SIZE_SHIFT		= 24,

	/* Only for pre-v7.1 (with no CFG_EXT register) */
	CFG_PAGE_SIZE_SHIFT		= 20,
	CFG_BLK_SIZE_SHIFT		= 28,

	/* Only for v7.1+ (with CFG_EXT register) */
	CFG_EXT_PAGE_SIZE_SHIFT		= 0,
	CFG_EXT_BLK_SIZE_SHIFT		= 4,
};

/* BRCMNAND_INTFC_STATUS */
enum {
	INTFC_FLASH_STATUS		= GENMASK(7, 0),

	INTFC_ERASED			= BIT(27),
	INTFC_OOB_VALID			= BIT(28),
	INTFC_CACHE_VALID		= BIT(29),
	INTFC_FLASH_READY		= BIT(30),
	INTFC_CTLR_READY		= BIT(31),
};

static inline u32 nand_readreg(struct brcmnand_controller *ctrl, u32 offs)
{
	return brcmnand_readl(ctrl->nand_base + offs);
}

static inline void nand_writereg(struct brcmnand_controller *ctrl, u32 offs,
				 u32 val)
{
	brcmnand_writel(val, ctrl->nand_base + offs);
}

static int brcmnand_revision_init(struct brcmnand_controller *ctrl)
{
	static const unsigned int block_sizes_v6[] = { 8, 16, 128, 256, 512, 1024, 2048, 0 };
	static const unsigned int block_sizes_v4[] = { 16, 128, 8, 512, 256, 1024, 2048, 0 };
	static const unsigned int page_sizes[] = { 512, 2048, 4096, 8192, 0 };

	ctrl->nand_version = nand_readreg(ctrl, 0) & 0xffff;

	/* Only support v4.0+? */
	if (ctrl->nand_version < 0x0400) {
		dev_err(ctrl->dev, "version %#x not supported\n",
			ctrl->nand_version);
		return -ENODEV;
	}

	/* Register offsets */
	if (ctrl->nand_version >= 0x0702)
		ctrl->reg_offsets = brcmnand_regs_v72;
	else if (ctrl->nand_version >= 0x0701)
		ctrl->reg_offsets = brcmnand_regs_v71;
	else if (ctrl->nand_version >= 0x0600)
		ctrl->reg_offsets = brcmnand_regs_v60;
	else if (ctrl->nand_version >= 0x0500)
		ctrl->reg_offsets = brcmnand_regs_v50;
	else if (ctrl->nand_version >= 0x0400)
		ctrl->reg_offsets = brcmnand_regs_v40;

	/* Chip-select stride */
	if (ctrl->nand_version >= 0x0701)
		ctrl->reg_spacing = 0x14;
	else
		ctrl->reg_spacing = 0x10;

	/* Per chip-select registers */
	if (ctrl->nand_version >= 0x0701) {
		ctrl->cs_offsets = brcmnand_cs_offsets_v71;
	} else {
		ctrl->cs_offsets = brcmnand_cs_offsets;

		/* v5.0 and earlier has a different CS0 offset layout */
		if (ctrl->nand_version <= 0x0500)
			ctrl->cs0_offsets = brcmnand_cs_offsets_cs0;
	}

	/* Page / block sizes */
	if (ctrl->nand_version >= 0x0701) {
		/* >= v7.1 use nice power-of-2 values! */
		ctrl->max_page_size = 16 * 1024;
		ctrl->max_block_size = 2 * 1024 * 1024;
	} else {
		ctrl->page_sizes = page_sizes;
		if (ctrl->nand_version >= 0x0600)
			ctrl->block_sizes = block_sizes_v6;
		else
			ctrl->block_sizes = block_sizes_v4;

		if (ctrl->nand_version < 0x0400) {
			ctrl->max_page_size = 4096;
			ctrl->max_block_size = 512 * 1024;
		}
	}

	/* Maximum spare area sector size (per 512B) */
	if (ctrl->nand_version >= 0x0702)
		ctrl->max_oob = 128;
	else if (ctrl->nand_version >= 0x0600)
		ctrl->max_oob = 64;
	else if (ctrl->nand_version >= 0x0500)
		ctrl->max_oob = 32;
	else
		ctrl->max_oob = 16;

	/* v6.0 and newer (except v6.1) have prefetch support */
	if (ctrl->nand_version >= 0x0600 && ctrl->nand_version != 0x0601)
		ctrl->features |= BRCMNAND_HAS_PREFETCH;

	/*
	 * v6.x has cache mode, but it's implemented differently. Ignore it for
	 * now.
	 */
	if (ctrl->nand_version >= 0x0700)
		ctrl->features |= BRCMNAND_HAS_CACHE_MODE;

	if (ctrl->nand_version >= 0x0500)
		ctrl->features |= BRCMNAND_HAS_1K_SECTORS;

	if (ctrl->nand_version >= 0x0700)
		ctrl->features |= BRCMNAND_HAS_WP;
	else if (of_property_read_bool(ctrl->dev->of_node, "brcm,nand-has-wp"))
		ctrl->features |= BRCMNAND_HAS_WP;

	return 0;
}

static inline u32 brcmnand_read_reg(struct brcmnand_controller *ctrl,
		enum brcmnand_reg reg)
{
	u16 offs = ctrl->reg_offsets[reg];

	if (offs)
		return nand_readreg(ctrl, offs);
	else
		return 0;
}

static inline void brcmnand_write_reg(struct brcmnand_controller *ctrl,
				      enum brcmnand_reg reg, u32 val)
{
	u16 offs = ctrl->reg_offsets[reg];

	if (offs)
		nand_writereg(ctrl, offs, val);
}

static inline void brcmnand_rmw_reg(struct brcmnand_controller *ctrl,
				    enum brcmnand_reg reg, u32 mask, unsigned
				    int shift, u32 val)
{
	u32 tmp = brcmnand_read_reg(ctrl, reg);

	tmp &= ~mask;
	tmp |= val << shift;
	brcmnand_write_reg(ctrl, reg, tmp);
}

static inline u32 brcmnand_read_fc(struct brcmnand_controller *ctrl, int word)
{
	return __raw_readl(ctrl->nand_fc + word * 4);
}

static inline void brcmnand_write_fc(struct brcmnand_controller *ctrl,
				     int word, u32 val)
{
	__raw_writel(val, ctrl->nand_fc + word * 4);
}

static inline u16 brcmnand_cs_offset(struct brcmnand_controller *ctrl, int cs,
				     enum brcmnand_cs_reg reg)
{
	u16 offs_cs0 = ctrl->reg_offsets[BRCMNAND_CS0_BASE];
	u16 offs_cs1 = ctrl->reg_offsets[BRCMNAND_CS1_BASE];
	u8 cs_offs;

	if (cs == 0 && ctrl->cs0_offsets)
		cs_offs = ctrl->cs0_offsets[reg];
	else
		cs_offs = ctrl->cs_offsets[reg];

	if (cs && offs_cs1)
		return offs_cs1 + (cs - 1) * ctrl->reg_spacing + cs_offs;

	return offs_cs0 + cs * ctrl->reg_spacing + cs_offs;
}

static inline u32 brcmnand_count_corrected(struct brcmnand_controller *ctrl)
{
	if (ctrl->nand_version < 0x0600)
		return 1;
	return brcmnand_read_reg(ctrl, BRCMNAND_CORR_COUNT);
}

static void brcmnand_wr_corr_thresh(struct brcmnand_host *host, u8 val)
{
	struct brcmnand_controller *ctrl = host->ctrl;
	unsigned int shift = 0, bits;
	enum brcmnand_reg reg = BRCMNAND_CORR_THRESHOLD;
	int cs = host->cs;

	if (ctrl->nand_version >= 0x0702)
		bits = 7;
	else if (ctrl->nand_version >= 0x0600)
		bits = 6;
	else if (ctrl->nand_version >= 0x0500)
		bits = 5;
	else
		bits = 4;

	if (ctrl->nand_version >= 0x0702) {
		if (cs >= 4)
			reg = BRCMNAND_CORR_THRESHOLD_EXT;
		shift = (cs % 4) * bits;
	} else if (ctrl->nand_version >= 0x0600) {
		if (cs >= 5)
			reg = BRCMNAND_CORR_THRESHOLD_EXT;
		shift = (cs % 5) * bits;
	}
	brcmnand_rmw_reg(ctrl, reg, (bits - 1) << shift, shift, val);
}

static inline int brcmnand_cmd_shift(struct brcmnand_controller *ctrl)
{
	if (ctrl->nand_version < 0x0602)
		return 24;
	return 0;
}

/***********************************************************************
 * NAND ACC CONTROL bitfield
 *
 * Some bits have remained constant throughout hardware revision, while
 * others have shifted around.
 ***********************************************************************/

/* Constant for all versions (where supported) */
enum {
	/* See BRCMNAND_HAS_CACHE_MODE */
	ACC_CONTROL_CACHE_MODE				= BIT(22),

	/* See BRCMNAND_HAS_PREFETCH */
	ACC_CONTROL_PREFETCH				= BIT(23),

	ACC_CONTROL_PAGE_HIT				= BIT(24),
	ACC_CONTROL_WR_PREEMPT				= BIT(25),
	ACC_CONTROL_PARTIAL_PAGE			= BIT(26),
	ACC_CONTROL_RD_ERASED				= BIT(27),
	ACC_CONTROL_FAST_PGM_RDIN			= BIT(28),
	ACC_CONTROL_WR_ECC				= BIT(30),
	ACC_CONTROL_RD_ECC				= BIT(31),
};

static inline u32 brcmnand_spare_area_mask(struct brcmnand_controller *ctrl)
{
	if (ctrl->nand_version >= 0x0702)
		return GENMASK(7, 0);
	else if (ctrl->nand_version >= 0x0600)
		return GENMASK(6, 0);
	else
		return GENMASK(5, 0);
}

#define NAND_ACC_CONTROL_ECC_SHIFT	16
#define NAND_ACC_CONTROL_ECC_EXT_SHIFT	13

static inline u32 brcmnand_ecc_level_mask(struct brcmnand_controller *ctrl)
{
	u32 mask = (ctrl->nand_version >= 0x0600) ? 0x1f : 0x0f;

	mask <<= NAND_ACC_CONTROL_ECC_SHIFT;

	/* v7.2 includes additional ECC levels */
	if (ctrl->nand_version >= 0x0702)
		mask |= 0x7 << NAND_ACC_CONTROL_ECC_EXT_SHIFT;

	return mask;
}

static void brcmnand_set_ecc_enabled(struct brcmnand_host *host, int en)
{
	struct brcmnand_controller *ctrl = host->ctrl;
	u16 offs = brcmnand_cs_offset(ctrl, host->cs, BRCMNAND_CS_ACC_CONTROL);
	u32 acc_control = nand_readreg(ctrl, offs);
	u32 ecc_flags = ACC_CONTROL_WR_ECC | ACC_CONTROL_RD_ECC;

	if (en) {
		acc_control |= ecc_flags; /* enable RD/WR ECC */
		acc_control |= host->hwcfg.ecc_level
			       << NAND_ACC_CONTROL_ECC_SHIFT;
	} else {
		acc_control &= ~ecc_flags; /* disable RD/WR ECC */
		acc_control &= ~brcmnand_ecc_level_mask(ctrl);
	}

	nand_writereg(ctrl, offs, acc_control);
}

static inline int brcmnand_sector_1k_shift(struct brcmnand_controller *ctrl)
{
	if (ctrl->nand_version >= 0x0702)
		return 9;
	else if (ctrl->nand_version >= 0x0600)
		return 7;
	else if (ctrl->nand_version >= 0x0500)
		return 6;
	else
		return -1;
}

static int brcmnand_get_sector_size_1k(struct brcmnand_host *host)
{
	struct brcmnand_controller *ctrl = host->ctrl;
	int shift = brcmnand_sector_1k_shift(ctrl);
	u16 acc_control_offs = brcmnand_cs_offset(ctrl, host->cs,
						  BRCMNAND_CS_ACC_CONTROL);

	if (shift < 0)
		return 0;

	return (nand_readreg(ctrl, acc_control_offs) >> shift) & 0x1;
}

static void brcmnand_set_sector_size_1k(struct brcmnand_host *host, int val)
{
	struct brcmnand_controller *ctrl = host->ctrl;
	int shift = brcmnand_sector_1k_shift(ctrl);
	u16 acc_control_offs = brcmnand_cs_offset(ctrl, host->cs,
						  BRCMNAND_CS_ACC_CONTROL);
	u32 tmp;

	if (shift < 0)
		return;

	tmp = nand_readreg(ctrl, acc_control_offs);
	tmp &= ~(1 << shift);
	tmp |= (!!val) << shift;
	nand_writereg(ctrl, acc_control_offs, tmp);
}

/***********************************************************************
 * CS_NAND_SELECT
 ***********************************************************************/

enum {
	CS_SELECT_NAND_WP			= BIT(29),
	CS_SELECT_AUTO_DEVICE_ID_CFG		= BIT(30),
};

static int bcmnand_ctrl_poll_status(struct brcmnand_controller *ctrl,
				    u32 mask, u32 expected_val,
				    unsigned long timeout_ms)
{
	unsigned long limit;
	u32 val;

	if (!timeout_ms)
		timeout_ms = NAND_POLL_STATUS_TIMEOUT_MS;

	limit = jiffies + msecs_to_jiffies(timeout_ms);
	do {
		val = brcmnand_read_reg(ctrl, BRCMNAND_INTFC_STATUS);
		if ((val & mask) == expected_val)
			return 0;

		cpu_relax();
	} while (time_after(limit, jiffies));

	dev_warn(ctrl->dev, "timeout on status poll (expected %x got %x)\n",
		 expected_val, val & mask);

	return -ETIMEDOUT;
}

static inline void brcmnand_set_wp(struct brcmnand_controller *ctrl, bool en)
{
	u32 val = en ? CS_SELECT_NAND_WP : 0;

	brcmnand_rmw_reg(ctrl, BRCMNAND_CS_SELECT, CS_SELECT_NAND_WP, 0, val);
}

/***********************************************************************
 * Flash DMA
 ***********************************************************************/

enum flash_dma_reg {
	FLASH_DMA_REVISION		= 0x00,
	FLASH_DMA_FIRST_DESC		= 0x04,
	FLASH_DMA_FIRST_DESC_EXT	= 0x08,
	FLASH_DMA_CTRL			= 0x0c,
	FLASH_DMA_MODE			= 0x10,
	FLASH_DMA_STATUS		= 0x14,
	FLASH_DMA_INTERRUPT_DESC	= 0x18,
	FLASH_DMA_INTERRUPT_DESC_EXT	= 0x1c,
	FLASH_DMA_ERROR_STATUS		= 0x20,
	FLASH_DMA_CURRENT_DESC		= 0x24,
	FLASH_DMA_CURRENT_DESC_EXT	= 0x28,
};

static inline bool has_flash_dma(struct brcmnand_controller *ctrl)
{
	return ctrl->flash_dma_base;
}

static inline bool flash_dma_buf_ok(const void *buf)
{
	return buf && !is_vmalloc_addr(buf) &&
		likely(IS_ALIGNED((uintptr_t)buf, 4));
}

static inline void flash_dma_writel(struct brcmnand_controller *ctrl, u8 offs,
				    u32 val)
{
	brcmnand_writel(val, ctrl->flash_dma_base + offs);
}

static inline u32 flash_dma_readl(struct brcmnand_controller *ctrl, u8 offs)
{
	return brcmnand_readl(ctrl->flash_dma_base + offs);
}

/* Low-level operation types: command, address, write, or read */
enum brcmnand_llop_type {
	LL_OP_CMD,
	LL_OP_ADDR,
	LL_OP_WR,
	LL_OP_RD,
};

/***********************************************************************
 * Internal support functions
 ***********************************************************************/

static inline bool is_hamming_ecc(struct brcmnand_controller *ctrl,
				  struct brcmnand_cfg *cfg)
{
	if (ctrl->nand_version <= 0x0701)
		return cfg->sector_size_1k == 0 && cfg->spare_area_size == 16 &&
			cfg->ecc_level == 15;
	else
		return cfg->sector_size_1k == 0 && ((cfg->spare_area_size == 16 &&
			cfg->ecc_level == 15) ||
			(cfg->spare_area_size == 28 && cfg->ecc_level == 16));
}

/*
 * Set mtd->ooblayout to the appropriate mtd_ooblayout_ops given
 * the layout/configuration.
 * Returns -ERRCODE on failure.
 */
static int brcmnand_hamming_ooblayout_ecc(struct mtd_info *mtd, int section,
					  struct mtd_oob_region *oobregion)
{
	struct nand_chip *chip = mtd_to_nand(mtd);
	struct brcmnand_host *host = nand_get_controller_data(chip);
	struct brcmnand_cfg *cfg = &host->hwcfg;
	int sas = cfg->spare_area_size << cfg->sector_size_1k;
	int sectors = cfg->page_size / (512 << cfg->sector_size_1k);

	if (section >= sectors)
		return -ERANGE;

	oobregion->offset = (section * sas) + 6;
	oobregion->length = 3;

	return 0;
}

static int brcmnand_hamming_ooblayout_free(struct mtd_info *mtd, int section,
					   struct mtd_oob_region *oobregion)
{
	struct nand_chip *chip = mtd_to_nand(mtd);
	struct brcmnand_host *host = nand_get_controller_data(chip);
	struct brcmnand_cfg *cfg = &host->hwcfg;
	int sas = cfg->spare_area_size << cfg->sector_size_1k;
	int sectors = cfg->page_size / (512 << cfg->sector_size_1k);

	if (section >= sectors * 2)
		return -ERANGE;

	oobregion->offset = (section / 2) * sas;

	if (section & 1) {
		oobregion->offset += 9;
		oobregion->length = 7;
	} else {
		oobregion->length = 6;

		/* First sector of each page may have BBI */
		if (!section) {
			/*
			 * Small-page NAND use byte 6 for BBI while large-page
			 * NAND use byte 0.
			 */
			if (cfg->page_size > 512)
				oobregion->offset++;
			oobregion->length--;
		}
	}

	return 0;
}

static const struct mtd_ooblayout_ops brcmnand_hamming_ooblayout_ops = {
	.ecc = brcmnand_hamming_ooblayout_ecc,
	.free = brcmnand_hamming_ooblayout_free,
};

static int brcmnand_bch_ooblayout_ecc(struct mtd_info *mtd, int section,
				      struct mtd_oob_region *oobregion)
{
	struct nand_chip *chip = mtd_to_nand(mtd);
	struct brcmnand_host *host = nand_get_controller_data(chip);
	struct brcmnand_cfg *cfg = &host->hwcfg;
	int sas = cfg->spare_area_size << cfg->sector_size_1k;
	int sectors = cfg->page_size / (512 << cfg->sector_size_1k);

	if (section >= sectors)
		return -ERANGE;

	oobregion->offset = (section * (sas + 1)) - chip->ecc.bytes;
	oobregion->length = chip->ecc.bytes;

	return 0;
}

static int brcmnand_bch_ooblayout_free_lp(struct mtd_info *mtd, int section,
					  struct mtd_oob_region *oobregion)
{
	struct nand_chip *chip = mtd_to_nand(mtd);
	struct brcmnand_host *host = nand_get_controller_data(chip);
	struct brcmnand_cfg *cfg = &host->hwcfg;
	int sas = cfg->spare_area_size << cfg->sector_size_1k;
	int sectors = cfg->page_size / (512 << cfg->sector_size_1k);

	if (section >= sectors)
		return -ERANGE;

	if (sas <= chip->ecc.bytes)
		return 0;

	oobregion->offset = section * sas;
	oobregion->length = sas - chip->ecc.bytes;

	if (!section) {
		oobregion->offset++;
		oobregion->length--;
	}

	return 0;
}

static int brcmnand_bch_ooblayout_free_sp(struct mtd_info *mtd, int section,
					  struct mtd_oob_region *oobregion)
{
	struct nand_chip *chip = mtd_to_nand(mtd);
	struct brcmnand_host *host = nand_get_controller_data(chip);
	struct brcmnand_cfg *cfg = &host->hwcfg;
	int sas = cfg->spare_area_size << cfg->sector_size_1k;

	if (section > 1 || sas - chip->ecc.bytes < 6 ||
	    (section && sas - chip->ecc.bytes == 6))
		return -ERANGE;

	if (!section) {
		oobregion->offset = 0;
		oobregion->length = 5;
	} else {
		oobregion->offset = 6;
		oobregion->length = sas - chip->ecc.bytes - 6;
	}

	return 0;
}

static const struct mtd_ooblayout_ops brcmnand_bch_lp_ooblayout_ops = {
	.ecc = brcmnand_bch_ooblayout_ecc,
	.free = brcmnand_bch_ooblayout_free_lp,
};

static const struct mtd_ooblayout_ops brcmnand_bch_sp_ooblayout_ops = {
	.ecc = brcmnand_bch_ooblayout_ecc,
	.free = brcmnand_bch_ooblayout_free_sp,
};

static int brcmstb_choose_ecc_layout(struct brcmnand_host *host)
{
	struct brcmnand_cfg *p = &host->hwcfg;
	struct mtd_info *mtd = nand_to_mtd(&host->chip);
	struct nand_ecc_ctrl *ecc = &host->chip.ecc;
	unsigned int ecc_level = p->ecc_level;
	int sas = p->spare_area_size << p->sector_size_1k;
	int sectors = p->page_size / (512 << p->sector_size_1k);

	if (p->sector_size_1k)
		ecc_level <<= 1;

	if (is_hamming_ecc(host->ctrl, p)) {
		ecc->bytes = 3 * sectors;
		mtd_set_ooblayout(mtd, &brcmnand_hamming_ooblayout_ops);
		return 0;
	}

	/*
	 * CONTROLLER_VERSION:
	 *   < v5.0: ECC_REQ = ceil(BCH_T * 13/8)
	 *  >= v5.0: ECC_REQ = ceil(BCH_T * 14/8)
	 * But we will just be conservative.
	 */
	ecc->bytes = DIV_ROUND_UP(ecc_level * 14, 8);
	if (p->page_size == 512)
		mtd_set_ooblayout(mtd, &brcmnand_bch_sp_ooblayout_ops);
	else
		mtd_set_ooblayout(mtd, &brcmnand_bch_lp_ooblayout_ops);

	if (ecc->bytes >= sas) {
		dev_err(&host->pdev->dev,
			"error: ECC too large for OOB (ECC bytes %d, spare sector %d)\n",
			ecc->bytes, sas);
		return -EINVAL;
	}

	return 0;
}

static void brcmnand_wp(struct mtd_info *mtd, int wp)
{
	struct nand_chip *chip = mtd_to_nand(mtd);
	struct brcmnand_host *host = nand_get_controller_data(chip);
	struct brcmnand_controller *ctrl = host->ctrl;

	if ((ctrl->features & BRCMNAND_HAS_WP) && wp_on == 1) {
		static int old_wp = -1;
		int ret;

		if (old_wp != wp) {
			dev_dbg(ctrl->dev, "WP %s\n", wp ? "on" : "off");
			old_wp = wp;
		}

		/*
		 * make sure ctrl/flash ready before and after
		 * changing state of #WP pin
		 */
		ret = bcmnand_ctrl_poll_status(ctrl, NAND_CTRL_RDY |
					       NAND_STATUS_READY,
					       NAND_CTRL_RDY |
					       NAND_STATUS_READY, 0);
		if (ret)
			return;

		brcmnand_set_wp(ctrl, wp);
		nand_status_op(chip, NULL);
		/* NAND_STATUS_WP 0x00 = protected, 0x80 = not protected */
		ret = bcmnand_ctrl_poll_status(ctrl,
					       NAND_CTRL_RDY |
					       NAND_STATUS_READY |
					       NAND_STATUS_WP,
					       NAND_CTRL_RDY |
					       NAND_STATUS_READY |
					       (wp ? 0 : NAND_STATUS_WP), 0);

		if (ret)
			dev_err_ratelimited(&host->pdev->dev,
					    "nand #WP expected %s\n",
					    wp ? "on" : "off");
	}
}

/* Helper functions for reading and writing OOB registers */
static inline u8 oob_reg_read(struct brcmnand_controller *ctrl, u32 offs)
{
	u16 offset0, offset10, reg_offs;

	offset0 = ctrl->reg_offsets[BRCMNAND_OOB_READ_BASE];
	offset10 = ctrl->reg_offsets[BRCMNAND_OOB_READ_10_BASE];

	if (offs >= ctrl->max_oob)
		return 0x77;

	if (offs >= 16 && offset10)
		reg_offs = offset10 + ((offs - 0x10) & ~0x03);
	else
		reg_offs = offset0 + (offs & ~0x03);

	return nand_readreg(ctrl, reg_offs) >> (24 - ((offs & 0x03) << 3));
}

static inline void oob_reg_write(struct brcmnand_controller *ctrl, u32 offs,
				 u32 data)
{
	u16 offset0, offset10, reg_offs;

	offset0 = ctrl->reg_offsets[BRCMNAND_OOB_WRITE_BASE];
	offset10 = ctrl->reg_offsets[BRCMNAND_OOB_WRITE_10_BASE];

	if (offs >= ctrl->max_oob)
		return;

	if (offs >= 16 && offset10)
		reg_offs = offset10 + ((offs - 0x10) & ~0x03);
	else
		reg_offs = offset0 + (offs & ~0x03);

	nand_writereg(ctrl, reg_offs, data);
}

/*
 * read_oob_from_regs - read data from OOB registers
 * @ctrl: NAND controller
 * @i: sub-page sector index
 * @oob: buffer to read to
 * @sas: spare area sector size (i.e., OOB size per FLASH_CACHE)
 * @sector_1k: 1 for 1KiB sectors, 0 for 512B, other values are illegal
 */
static int read_oob_from_regs(struct brcmnand_controller *ctrl, int i, u8 *oob,
			      int sas, int sector_1k)
{
	int tbytes = sas << sector_1k;
	int j;

	/* Adjust OOB values for 1K sector size */
	if (sector_1k && (i & 0x01))
		tbytes = max(0, tbytes - (int)ctrl->max_oob);
	tbytes = min_t(int, tbytes, ctrl->max_oob);

	for (j = 0; j < tbytes; j++)
		oob[j] = oob_reg_read(ctrl, j);
	return tbytes;
}

/*
 * write_oob_to_regs - write data to OOB registers
 * @i: sub-page sector index
 * @oob: buffer to write from
 * @sas: spare area sector size (i.e., OOB size per FLASH_CACHE)
 * @sector_1k: 1 for 1KiB sectors, 0 for 512B, other values are illegal
 */
static int write_oob_to_regs(struct brcmnand_controller *ctrl, int i,
			     const u8 *oob, int sas, int sector_1k)
{
	int tbytes = sas << sector_1k;
	int j;

	/* Adjust OOB values for 1K sector size */
	if (sector_1k && (i & 0x01))
		tbytes = max(0, tbytes - (int)ctrl->max_oob);
	tbytes = min_t(int, tbytes, ctrl->max_oob);

	for (j = 0; j < tbytes; j += 4)
		oob_reg_write(ctrl, j,
				(oob[j + 0] << 24) |
				(oob[j + 1] << 16) |
				(oob[j + 2] <<  8) |
				(oob[j + 3] <<  0));
	return tbytes;
}

static irqreturn_t brcmnand_ctlrdy_irq(int irq, void *data)
{
	struct brcmnand_controller *ctrl = data;

	/* Discard all NAND_CTLRDY interrupts during DMA */
	if (ctrl->dma_pending)
		return IRQ_HANDLED;

	complete(&ctrl->done);
	return IRQ_HANDLED;
}

/* Handle SoC-specific interrupt hardware */
static irqreturn_t brcmnand_irq(int irq, void *data)
{
	struct brcmnand_controller *ctrl = data;

	if (ctrl->soc->ctlrdy_ack(ctrl->soc))
		return brcmnand_ctlrdy_irq(irq, data);

	return IRQ_NONE;
}

static irqreturn_t brcmnand_dma_irq(int irq, void *data)
{
	struct brcmnand_controller *ctrl = data;

	complete(&ctrl->dma_done);

	return IRQ_HANDLED;
}

static void brcmnand_send_cmd(struct brcmnand_host *host, int cmd)
{
	struct brcmnand_controller *ctrl = host->ctrl;
	int ret;

	dev_dbg(ctrl->dev, "send native cmd %d addr_lo 0x%x\n", cmd,
		brcmnand_read_reg(ctrl, BRCMNAND_CMD_ADDRESS));
	BUG_ON(ctrl->cmd_pending != 0);
	ctrl->cmd_pending = cmd;

	ret = bcmnand_ctrl_poll_status(ctrl, NAND_CTRL_RDY, NAND_CTRL_RDY, 0);
	WARN_ON(ret);

	mb(); /* flush previous writes */
	brcmnand_write_reg(ctrl, BRCMNAND_CMD_START,
			   cmd << brcmnand_cmd_shift(ctrl));
}

/***********************************************************************
 * NAND MTD API: read/program/erase
 ***********************************************************************/

static void brcmnand_cmd_ctrl(struct mtd_info *mtd, int dat,
	unsigned int ctrl)
{
	/* intentionally left blank */
}

static int brcmnand_waitfunc(struct mtd_info *mtd, struct nand_chip *this)
{
	struct nand_chip *chip = mtd_to_nand(mtd);
	struct brcmnand_host *host = nand_get_controller_data(chip);
	struct brcmnand_controller *ctrl = host->ctrl;
	unsigned long timeo = msecs_to_jiffies(100);

	dev_dbg(ctrl->dev, "wait on native cmd %d\n", ctrl->cmd_pending);
	if (ctrl->cmd_pending &&
			wait_for_completion_timeout(&ctrl->done, timeo) <= 0) {
		u32 cmd = brcmnand_read_reg(ctrl, BRCMNAND_CMD_START)
					>> brcmnand_cmd_shift(ctrl);

		dev_err_ratelimited(ctrl->dev,
			"timeout waiting for command %#02x\n", cmd);
		dev_err_ratelimited(ctrl->dev, "intfc status %08x\n",
			brcmnand_read_reg(ctrl, BRCMNAND_INTFC_STATUS));
	}
	ctrl->cmd_pending = 0;
	return brcmnand_read_reg(ctrl, BRCMNAND_INTFC_STATUS) &
				 INTFC_FLASH_STATUS;
}

enum {
	LLOP_RE				= BIT(16),
	LLOP_WE				= BIT(17),
	LLOP_ALE			= BIT(18),
	LLOP_CLE			= BIT(19),
	LLOP_RETURN_IDLE		= BIT(31),

	LLOP_DATA_MASK			= GENMASK(15, 0),
};

static int brcmnand_low_level_op(struct brcmnand_host *host,
				 enum brcmnand_llop_type type, u32 data,
				 bool last_op)
{
	struct mtd_info *mtd = nand_to_mtd(&host->chip);
	struct nand_chip *chip = &host->chip;
	struct brcmnand_controller *ctrl = host->ctrl;
	u32 tmp;

	tmp = data & LLOP_DATA_MASK;
	switch (type) {
	case LL_OP_CMD:
		tmp |= LLOP_WE | LLOP_CLE;
		break;
	case LL_OP_ADDR:
		/* WE | ALE */
		tmp |= LLOP_WE | LLOP_ALE;
		break;
	case LL_OP_WR:
		/* WE */
		tmp |= LLOP_WE;
		break;
	case LL_OP_RD:
		/* RE */
		tmp |= LLOP_RE;
		break;
	}
	if (last_op)
		/* RETURN_IDLE */
		tmp |= LLOP_RETURN_IDLE;

	dev_dbg(ctrl->dev, "ll_op cmd %#x\n", tmp);

	brcmnand_write_reg(ctrl, BRCMNAND_LL_OP, tmp);
	(void)brcmnand_read_reg(ctrl, BRCMNAND_LL_OP);

	brcmnand_send_cmd(host, CMD_LOW_LEVEL_OP);
	return brcmnand_waitfunc(mtd, chip);
}

static void brcmnand_cmdfunc(struct mtd_info *mtd, unsigned command,
			     int column, int page_addr)
{
	struct nand_chip *chip = mtd_to_nand(mtd);
	struct brcmnand_host *host = nand_get_controller_data(chip);
	struct brcmnand_controller *ctrl = host->ctrl;
	u64 addr = (u64)page_addr << chip->page_shift;
	int native_cmd = 0;

	if (command == NAND_CMD_READID || command == NAND_CMD_PARAM ||
			command == NAND_CMD_RNDOUT)
		addr = (u64)column;
	/* Avoid propagating a negative, don't-care address */
	else if (page_addr < 0)
		addr = 0;

	dev_dbg(ctrl->dev, "cmd 0x%x addr 0x%llx\n", command,
		(unsigned long long)addr);

	host->last_cmd = command;
	host->last_byte = 0;
	host->last_addr = addr;

	switch (command) {
	case NAND_CMD_RESET:
		native_cmd = CMD_FLASH_RESET;
		break;
	case NAND_CMD_STATUS:
		native_cmd = CMD_STATUS_READ;
		break;
	case NAND_CMD_READID:
		native_cmd = CMD_DEVICE_ID_READ;
		break;
	case NAND_CMD_READOOB:
		native_cmd = CMD_SPARE_AREA_READ;
		break;
	case NAND_CMD_ERASE1:
		native_cmd = CMD_BLOCK_ERASE;
		brcmnand_wp(mtd, 0);
		break;
	case NAND_CMD_PARAM:
		native_cmd = CMD_PARAMETER_READ;
		break;
	case NAND_CMD_SET_FEATURES:
	case NAND_CMD_GET_FEATURES:
		brcmnand_low_level_op(host, LL_OP_CMD, command, false);
		brcmnand_low_level_op(host, LL_OP_ADDR, column, false);
		break;
	case NAND_CMD_RNDOUT:
		native_cmd = CMD_PARAMETER_CHANGE_COL;
		addr &= ~((u64)(FC_BYTES - 1));
		/*
		 * HW quirk: PARAMETER_CHANGE_COL requires SECTOR_SIZE_1K=0
		 * NB: hwcfg.sector_size_1k may not be initialized yet
		 */
		if (brcmnand_get_sector_size_1k(host)) {
			host->hwcfg.sector_size_1k =
				brcmnand_get_sector_size_1k(host);
			brcmnand_set_sector_size_1k(host, 0);
		}
		break;
	}

	if (!native_cmd)
		return;

	brcmnand_write_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS,
		(host->cs << 16) | ((addr >> 32) & 0xffff));
	(void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS);
	brcmnand_write_reg(ctrl, BRCMNAND_CMD_ADDRESS, lower_32_bits(addr));
	(void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_ADDRESS);

	brcmnand_send_cmd(host, native_cmd);
	brcmnand_waitfunc(mtd, chip);

	if (native_cmd == CMD_PARAMETER_READ ||
			native_cmd == CMD_PARAMETER_CHANGE_COL) {
		/* Copy flash cache word-wise */
		u32 *flash_cache = (u32 *)ctrl->flash_cache;
		int i;

		brcmnand_soc_data_bus_prepare(ctrl->soc, true);

		/*
		 * Must cache the FLASH_CACHE now, since changes in
		 * SECTOR_SIZE_1K may invalidate it
		 */
		for (i = 0; i < FC_WORDS; i++)
			/*
			 * Flash cache is big endian for parameter pages, at
			 * least on STB SoCs
			 */
			flash_cache[i] = be32_to_cpu(brcmnand_read_fc(ctrl, i));

		brcmnand_soc_data_bus_unprepare(ctrl->soc, true);

		/* Cleanup from HW quirk: restore SECTOR_SIZE_1K */
		if (host->hwcfg.sector_size_1k)
			brcmnand_set_sector_size_1k(host,
						    host->hwcfg.sector_size_1k);
	}

	/* Re-enable protection is necessary only after erase */
	if (command == NAND_CMD_ERASE1)
		brcmnand_wp(mtd, 1);
}

static uint8_t brcmnand_read_byte(struct mtd_info *mtd)
{
	struct nand_chip *chip = mtd_to_nand(mtd);
	struct brcmnand_host *host = nand_get_controller_data(chip);
	struct brcmnand_controller *ctrl = host->ctrl;
	uint8_t ret = 0;
	int addr, offs;

	switch (host->last_cmd) {
	case NAND_CMD_READID:
		if (host->last_byte < 4)
			ret = brcmnand_read_reg(ctrl, BRCMNAND_ID) >>
				(24 - (host->last_byte << 3));
		else if (host->last_byte < 8)
			ret = brcmnand_read_reg(ctrl, BRCMNAND_ID_EXT) >>
				(56 - (host->last_byte << 3));
		break;

	case NAND_CMD_READOOB:
		ret = oob_reg_read(ctrl, host->last_byte);
		break;

	case NAND_CMD_STATUS:
		ret = brcmnand_read_reg(ctrl, BRCMNAND_INTFC_STATUS) &
					INTFC_FLASH_STATUS;
		if (wp_on) /* hide WP status */
			ret |= NAND_STATUS_WP;
		break;

	case NAND_CMD_PARAM:
	case NAND_CMD_RNDOUT:
		addr = host->last_addr + host->last_byte;
		offs = addr & (FC_BYTES - 1);

		/* At FC_BYTES boundary, switch to next column */
		if (host->last_byte > 0 && offs == 0)
			nand_change_read_column_op(chip, addr, NULL, 0, false);

		ret = ctrl->flash_cache[offs];
		break;
	case NAND_CMD_GET_FEATURES:
		if (host->last_byte >= ONFI_SUBFEATURE_PARAM_LEN) {
			ret = 0;
		} else {
			bool last = host->last_byte ==
				ONFI_SUBFEATURE_PARAM_LEN - 1;
			brcmnand_low_level_op(host, LL_OP_RD, 0, last);
			ret = brcmnand_read_reg(ctrl, BRCMNAND_LL_RDATA) & 0xff;
		}
	}

	dev_dbg(ctrl->dev, "read byte = 0x%02x\n", ret);
	host->last_byte++;

	return ret;
}

static void brcmnand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
{
	int i;

	for (i = 0; i < len; i++, buf++)
		*buf = brcmnand_read_byte(mtd);
}

static void brcmnand_write_buf(struct mtd_info *mtd, const uint8_t *buf,
				   int len)
{
	int i;
	struct nand_chip *chip = mtd_to_nand(mtd);
	struct brcmnand_host *host = nand_get_controller_data(chip);

	switch (host->last_cmd) {
	case NAND_CMD_SET_FEATURES:
		for (i = 0; i < len; i++)
			brcmnand_low_level_op(host, LL_OP_WR, buf[i],
						  (i + 1) == len);
		break;
	default:
		BUG();
		break;
	}
}

/**
 * Construct a FLASH_DMA descriptor as part of a linked list. You must know the
 * following ahead of time:
 *  - Is this descriptor the beginning or end of a linked list?
 *  - What is the (DMA) address of the next descriptor in the linked list?
 */
static int brcmnand_fill_dma_desc(struct brcmnand_host *host,
				  struct brcm_nand_dma_desc *desc, u64 addr,
				  dma_addr_t buf, u32 len, u8 dma_cmd,
				  bool begin, bool end,
				  dma_addr_t next_desc)
{
	memset(desc, 0, sizeof(*desc));
	/* Descriptors are written in native byte order (wordwise) */
	desc->next_desc = lower_32_bits(next_desc);
	desc->next_desc_ext = upper_32_bits(next_desc);
	desc->cmd_irq = (dma_cmd << 24) |
		(end ? (0x03 << 8) : 0) | /* IRQ | STOP */
		(!!begin) | ((!!end) << 1); /* head, tail */
#ifdef CONFIG_CPU_BIG_ENDIAN
	desc->cmd_irq |= 0x01 << 12;
#endif
	desc->dram_addr = lower_32_bits(buf);
	desc->dram_addr_ext = upper_32_bits(buf);
	desc->tfr_len = len;
	desc->total_len = len;
	desc->flash_addr = lower_32_bits(addr);
	desc->flash_addr_ext = upper_32_bits(addr);
	desc->cs = host->cs;
	desc->status_valid = 0x01;
	return 0;
}

/**
 * Kick the FLASH_DMA engine, with a given DMA descriptor
 */
static void brcmnand_dma_run(struct brcmnand_host *host, dma_addr_t desc)
{
	struct brcmnand_controller *ctrl = host->ctrl;
	unsigned long timeo = msecs_to_jiffies(100);

	flash_dma_writel(ctrl, FLASH_DMA_FIRST_DESC, lower_32_bits(desc));
	(void)flash_dma_readl(ctrl, FLASH_DMA_FIRST_DESC);
	flash_dma_writel(ctrl, FLASH_DMA_FIRST_DESC_EXT, upper_32_bits(desc));
	(void)flash_dma_readl(ctrl, FLASH_DMA_FIRST_DESC_EXT);

	/* Start FLASH_DMA engine */
	ctrl->dma_pending = true;
	mb(); /* flush previous writes */
	flash_dma_writel(ctrl, FLASH_DMA_CTRL, 0x03); /* wake | run */

	if (wait_for_completion_timeout(&ctrl->dma_done, timeo) <= 0) {
		dev_err(ctrl->dev,
				"timeout waiting for DMA; status %#x, error status %#x\n",
				flash_dma_readl(ctrl, FLASH_DMA_STATUS),
				flash_dma_readl(ctrl, FLASH_DMA_ERROR_STATUS));
	}
	ctrl->dma_pending = false;
	flash_dma_writel(ctrl, FLASH_DMA_CTRL, 0); /* force stop */
}

static int brcmnand_dma_trans(struct brcmnand_host *host, u64 addr, u32 *buf,
			      u32 len, u8 dma_cmd)
{
	struct brcmnand_controller *ctrl = host->ctrl;
	dma_addr_t buf_pa;
	int dir = dma_cmd == CMD_PAGE_READ ? DMA_FROM_DEVICE : DMA_TO_DEVICE;

	buf_pa = dma_map_single(ctrl->dev, buf, len, dir);
	if (dma_mapping_error(ctrl->dev, buf_pa)) {
		dev_err(ctrl->dev, "unable to map buffer for DMA\n");
		return -ENOMEM;
	}

	brcmnand_fill_dma_desc(host, ctrl->dma_desc, addr, buf_pa, len,
				   dma_cmd, true, true, 0);

	brcmnand_dma_run(host, ctrl->dma_pa);

	dma_unmap_single(ctrl->dev, buf_pa, len, dir);

	if (ctrl->dma_desc->status_valid & FLASH_DMA_ECC_ERROR)
		return -EBADMSG;
	else if (ctrl->dma_desc->status_valid & FLASH_DMA_CORR_ERROR)
		return -EUCLEAN;

	return 0;
}

/*
 * Assumes proper CS is already set
 */
static int brcmnand_read_by_pio(struct mtd_info *mtd, struct nand_chip *chip,
				u64 addr, unsigned int trans, u32 *buf,
				u8 *oob, u64 *err_addr)
{
	struct brcmnand_host *host = nand_get_controller_data(chip);
	struct brcmnand_controller *ctrl = host->ctrl;
	int i, j, ret = 0;

	/* Clear error addresses */
	brcmnand_write_reg(ctrl, BRCMNAND_UNCORR_ADDR, 0);
	brcmnand_write_reg(ctrl, BRCMNAND_CORR_ADDR, 0);
	brcmnand_write_reg(ctrl, BRCMNAND_UNCORR_EXT_ADDR, 0);
	brcmnand_write_reg(ctrl, BRCMNAND_CORR_EXT_ADDR, 0);

	brcmnand_write_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS,
			(host->cs << 16) | ((addr >> 32) & 0xffff));
	(void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS);

	for (i = 0; i < trans; i++, addr += FC_BYTES) {
		brcmnand_write_reg(ctrl, BRCMNAND_CMD_ADDRESS,
				   lower_32_bits(addr));
		(void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_ADDRESS);
		/* SPARE_AREA_READ does not use ECC, so just use PAGE_READ */
		brcmnand_send_cmd(host, CMD_PAGE_READ);
		brcmnand_waitfunc(mtd, chip);

		if (likely(buf)) {
			brcmnand_soc_data_bus_prepare(ctrl->soc, false);

			for (j = 0; j < FC_WORDS; j++, buf++)
				*buf = brcmnand_read_fc(ctrl, j);

			brcmnand_soc_data_bus_unprepare(ctrl->soc, false);
		}

		if (oob)
			oob += read_oob_from_regs(ctrl, i, oob,
					mtd->oobsize / trans,
					host->hwcfg.sector_size_1k);

		if (!ret) {
			*err_addr = brcmnand_read_reg(ctrl,
					BRCMNAND_UNCORR_ADDR) |
				((u64)(brcmnand_read_reg(ctrl,
						BRCMNAND_UNCORR_EXT_ADDR)
					& 0xffff) << 32);
			if (*err_addr)
				ret = -EBADMSG;
		}

		if (!ret) {
			*err_addr = brcmnand_read_reg(ctrl,
					BRCMNAND_CORR_ADDR) |
				((u64)(brcmnand_read_reg(ctrl,
						BRCMNAND_CORR_EXT_ADDR)
					& 0xffff) << 32);
			if (*err_addr)
				ret = -EUCLEAN;
		}
	}

	return ret;
}

/*
 * Check a page to see if it is erased (w/ bitflips) after an uncorrectable ECC
 * error
 *
 * Because the HW ECC signals an ECC error if an erase paged has even a single
 * bitflip, we must check each ECC error to see if it is actually an erased
 * page with bitflips, not a truly corrupted page.
 *
 * On a real error, return a negative error code (-EBADMSG for ECC error), and
 * buf will contain raw data.
 * Otherwise, buf gets filled with 0xffs and return the maximum number of
 * bitflips-per-ECC-sector to the caller.
 *
 */
static int brcmstb_nand_verify_erased_page(struct mtd_info *mtd,
		  struct nand_chip *chip, void *buf, u64 addr)
{
	int i, sas;
	void *oob = chip->oob_poi;
	int bitflips = 0;
	int page = addr >> chip->page_shift;
	int ret;

	if (!buf) {
		buf = chip->data_buf;
		/* Invalidate page cache */
		chip->pagebuf = -1;
	}

	sas = mtd->oobsize / chip->ecc.steps;

	/* read without ecc for verification */
	ret = chip->ecc.read_page_raw(mtd, chip, buf, true, page);
	if (ret)
		return ret;

	for (i = 0; i < chip->ecc.steps; i++, oob += sas) {
		ret = nand_check_erased_ecc_chunk(buf, chip->ecc.size,
						  oob, sas, NULL, 0,
						  chip->ecc.strength);
		if (ret < 0)
			return ret;

		bitflips = max(bitflips, ret);
	}

	return bitflips;
}

static int brcmnand_read(struct mtd_info *mtd, struct nand_chip *chip,
			 u64 addr, unsigned int trans, u32 *buf, u8 *oob)
{
	struct brcmnand_host *host = nand_get_controller_data(chip);
	struct brcmnand_controller *ctrl = host->ctrl;
	u64 err_addr = 0;
	int err;
	bool retry = true;

	dev_dbg(ctrl->dev, "read %llx -> %p\n", (unsigned long long)addr, buf);

try_dmaread:
	brcmnand_write_reg(ctrl, BRCMNAND_UNCORR_COUNT, 0);

	if (has_flash_dma(ctrl) && !oob && flash_dma_buf_ok(buf)) {
		err = brcmnand_dma_trans(host, addr, buf, trans * FC_BYTES,
					     CMD_PAGE_READ);
		if (err) {
			if (mtd_is_bitflip_or_eccerr(err))
				err_addr = addr;
			else
				return -EIO;
		}
	} else {
		if (oob)
			memset(oob, 0x99, mtd->oobsize);

		err = brcmnand_read_by_pio(mtd, chip, addr, trans, buf,
					       oob, &err_addr);
	}

	if (mtd_is_eccerr(err)) {
		/*
		 * On controller version and 7.0, 7.1 , DMA read after a
		 * prior PIO read that reported uncorrectable error,
		 * the DMA engine captures this error following DMA read
		 * cleared only on subsequent DMA read, so just retry once
		 * to clear a possible false error reported for current DMA
		 * read
		 */
		if ((ctrl->nand_version == 0x0700) ||
		    (ctrl->nand_version == 0x0701)) {
			if (retry) {
				retry = false;
				goto try_dmaread;
			}
		}

		/*
		 * Controller version 7.2 has hw encoder to detect erased page
		 * bitflips, apply sw verification for older controllers only
		 */
		if (ctrl->nand_version < 0x0702) {
			err = brcmstb_nand_verify_erased_page(mtd, chip, buf,
							      addr);
			/* erased page bitflips corrected */
			if (err >= 0)
				return err;
		}

		dev_dbg(ctrl->dev, "uncorrectable error at 0x%llx\n",
			(unsigned long long)err_addr);
		mtd->ecc_stats.failed++;
		/* NAND layer expects zero on ECC errors */
		return 0;
	}

	if (mtd_is_bitflip(err)) {
		unsigned int corrected = brcmnand_count_corrected(ctrl);

		dev_dbg(ctrl->dev, "corrected error at 0x%llx\n",
			(unsigned long long)err_addr);
		mtd->ecc_stats.corrected += corrected;
		/* Always exceed the software-imposed threshold */
		return max(mtd->bitflip_threshold, corrected);
	}

	return 0;
}

static int brcmnand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
			      uint8_t *buf, int oob_required, int page)
{
	struct brcmnand_host *host = nand_get_controller_data(chip);
	u8 *oob = oob_required ? (u8 *)chip->oob_poi : NULL;

	nand_read_page_op(chip, page, 0, NULL, 0);

	return brcmnand_read(mtd, chip, host->last_addr,
			mtd->writesize >> FC_SHIFT, (u32 *)buf, oob);
}

static int brcmnand_read_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
				  uint8_t *buf, int oob_required, int page)
{
	struct brcmnand_host *host = nand_get_controller_data(chip);
	u8 *oob = oob_required ? (u8 *)chip->oob_poi : NULL;
	int ret;

	nand_read_page_op(chip, page, 0, NULL, 0);

	brcmnand_set_ecc_enabled(host, 0);
	ret = brcmnand_read(mtd, chip, host->last_addr,
			mtd->writesize >> FC_SHIFT, (u32 *)buf, oob);
	brcmnand_set_ecc_enabled(host, 1);
	return ret;
}

static int brcmnand_read_oob(struct mtd_info *mtd, struct nand_chip *chip,
			     int page)
{
	return brcmnand_read(mtd, chip, (u64)page << chip->page_shift,
			mtd->writesize >> FC_SHIFT,
			NULL, (u8 *)chip->oob_poi);
}

static int brcmnand_read_oob_raw(struct mtd_info *mtd, struct nand_chip *chip,
				 int page)
{
	struct brcmnand_host *host = nand_get_controller_data(chip);

	brcmnand_set_ecc_enabled(host, 0);
	brcmnand_read(mtd, chip, (u64)page << chip->page_shift,
		mtd->writesize >> FC_SHIFT,
		NULL, (u8 *)chip->oob_poi);
	brcmnand_set_ecc_enabled(host, 1);
	return 0;
}

static int brcmnand_write(struct mtd_info *mtd, struct nand_chip *chip,
			  u64 addr, const u32 *buf, u8 *oob)
{
	struct brcmnand_host *host = nand_get_controller_data(chip);
	struct brcmnand_controller *ctrl = host->ctrl;
	unsigned int i, j, trans = mtd->writesize >> FC_SHIFT;
	int status, ret = 0;

	dev_dbg(ctrl->dev, "write %llx <- %p\n", (unsigned long long)addr, buf);

	if (unlikely((unsigned long)buf & 0x03)) {
		dev_warn(ctrl->dev, "unaligned buffer: %p\n", buf);
		buf = (u32 *)((unsigned long)buf & ~0x03);
	}

	brcmnand_wp(mtd, 0);

	for (i = 0; i < ctrl->max_oob; i += 4)
		oob_reg_write(ctrl, i, 0xffffffff);

	if (has_flash_dma(ctrl) && !oob && flash_dma_buf_ok(buf)) {
		if (brcmnand_dma_trans(host, addr, (u32 *)buf,
					mtd->writesize, CMD_PROGRAM_PAGE))
			ret = -EIO;
		goto out;
	}

	brcmnand_write_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS,
			(host->cs << 16) | ((addr >> 32) & 0xffff));
	(void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS);

	for (i = 0; i < trans; i++, addr += FC_BYTES) {
		/* full address MUST be set before populating FC */
		brcmnand_write_reg(ctrl, BRCMNAND_CMD_ADDRESS,
				   lower_32_bits(addr));
		(void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_ADDRESS);

		if (buf) {
			brcmnand_soc_data_bus_prepare(ctrl->soc, false);

			for (j = 0; j < FC_WORDS; j++, buf++)
				brcmnand_write_fc(ctrl, j, *buf);

			brcmnand_soc_data_bus_unprepare(ctrl->soc, false);
		} else if (oob) {
			for (j = 0; j < FC_WORDS; j++)
				brcmnand_write_fc(ctrl, j, 0xffffffff);
		}

		if (oob) {
			oob += write_oob_to_regs(ctrl, i, oob,
					mtd->oobsize / trans,
					host->hwcfg.sector_size_1k);
		}

		/* we cannot use SPARE_AREA_PROGRAM when PARTIAL_PAGE_EN=0 */
		brcmnand_send_cmd(host, CMD_PROGRAM_PAGE);
		status = brcmnand_waitfunc(mtd, chip);

		if (status & NAND_STATUS_FAIL) {
			dev_info(ctrl->dev, "program failed at %llx\n",
				(unsigned long long)addr);
			ret = -EIO;
			goto out;
		}
	}
out:
	brcmnand_wp(mtd, 1);
	return ret;
}

static int brcmnand_write_page(struct mtd_info *mtd, struct nand_chip *chip,
			       const uint8_t *buf, int oob_required, int page)
{
	struct brcmnand_host *host = nand_get_controller_data(chip);
	void *oob = oob_required ? chip->oob_poi : NULL;

	nand_prog_page_begin_op(chip, page, 0, NULL, 0);
	brcmnand_write(mtd, chip, host->last_addr, (const u32 *)buf, oob);

	return nand_prog_page_end_op(chip);
}

static int brcmnand_write_page_raw(struct mtd_info *mtd,
				   struct nand_chip *chip, const uint8_t *buf,
				   int oob_required, int page)
{
	struct brcmnand_host *host = nand_get_controller_data(chip);
	void *oob = oob_required ? chip->oob_poi : NULL;

	nand_prog_page_begin_op(chip, page, 0, NULL, 0);
	brcmnand_set_ecc_enabled(host, 0);
	brcmnand_write(mtd, chip, host->last_addr, (const u32 *)buf, oob);
	brcmnand_set_ecc_enabled(host, 1);

	return nand_prog_page_end_op(chip);
}

static int brcmnand_write_oob(struct mtd_info *mtd, struct nand_chip *chip,
				  int page)
{
	return brcmnand_write(mtd, chip, (u64)page << chip->page_shift,
				  NULL, chip->oob_poi);
}

static int brcmnand_write_oob_raw(struct mtd_info *mtd, struct nand_chip *chip,
				  int page)
{
	struct brcmnand_host *host = nand_get_controller_data(chip);
	int ret;

	brcmnand_set_ecc_enabled(host, 0);
	ret = brcmnand_write(mtd, chip, (u64)page << chip->page_shift, NULL,
				 (u8 *)chip->oob_poi);
	brcmnand_set_ecc_enabled(host, 1);

	return ret;
}

/***********************************************************************
 * Per-CS setup (1 NAND device)
 ***********************************************************************/

static int brcmnand_set_cfg(struct brcmnand_host *host,
			    struct brcmnand_cfg *cfg)
{
	struct brcmnand_controller *ctrl = host->ctrl;
	struct nand_chip *chip = &host->chip;
	u16 cfg_offs = brcmnand_cs_offset(ctrl, host->cs, BRCMNAND_CS_CFG);
	u16 cfg_ext_offs = brcmnand_cs_offset(ctrl, host->cs,
			BRCMNAND_CS_CFG_EXT);
	u16 acc_control_offs = brcmnand_cs_offset(ctrl, host->cs,
			BRCMNAND_CS_ACC_CONTROL);
	u8 block_size = 0, page_size = 0, device_size = 0;
	u32 tmp;

	if (ctrl->block_sizes) {
		int i, found;

		for (i = 0, found = 0; ctrl->block_sizes[i]; i++)
			if (ctrl->block_sizes[i] * 1024 == cfg->block_size) {
				block_size = i;
				found = 1;
			}
		if (!found) {
			dev_warn(ctrl->dev, "invalid block size %u\n",
					cfg->block_size);
			return -EINVAL;
		}
	} else {
		block_size = ffs(cfg->block_size) - ffs(BRCMNAND_MIN_BLOCKSIZE);
	}

	if (cfg->block_size < BRCMNAND_MIN_BLOCKSIZE || (ctrl->max_block_size &&
				cfg->block_size > ctrl->max_block_size)) {
		dev_warn(ctrl->dev, "invalid block size %u\n",
				cfg->block_size);
		block_size = 0;
	}

	if (ctrl->page_sizes) {
		int i, found;

		for (i = 0, found = 0; ctrl->page_sizes[i]; i++)
			if (ctrl->page_sizes[i] == cfg->page_size) {
				page_size = i;
				found = 1;
			}
		if (!found) {
			dev_warn(ctrl->dev, "invalid page size %u\n",
					cfg->page_size);
			return -EINVAL;
		}
	} else {
		page_size = ffs(cfg->page_size) - ffs(BRCMNAND_MIN_PAGESIZE);
	}

	if (cfg->page_size < BRCMNAND_MIN_PAGESIZE || (ctrl->max_page_size &&
				cfg->page_size > ctrl->max_page_size)) {
		dev_warn(ctrl->dev, "invalid page size %u\n", cfg->page_size);
		return -EINVAL;
	}

	if (fls64(cfg->device_size) < fls64(BRCMNAND_MIN_DEVSIZE)) {
		dev_warn(ctrl->dev, "invalid device size 0x%llx\n",
			(unsigned long long)cfg->device_size);
		return -EINVAL;
	}
	device_size = fls64(cfg->device_size) - fls64(BRCMNAND_MIN_DEVSIZE);

	tmp = (cfg->blk_adr_bytes << CFG_BLK_ADR_BYTES_SHIFT) |
		(cfg->col_adr_bytes << CFG_COL_ADR_BYTES_SHIFT) |
		(cfg->ful_adr_bytes << CFG_FUL_ADR_BYTES_SHIFT) |
		(!!(cfg->device_width == 16) << CFG_BUS_WIDTH_SHIFT) |
		(device_size << CFG_DEVICE_SIZE_SHIFT);
	if (cfg_offs == cfg_ext_offs) {
		tmp |= (page_size << CFG_PAGE_SIZE_SHIFT) |
		       (block_size << CFG_BLK_SIZE_SHIFT);
		nand_writereg(ctrl, cfg_offs, tmp);
	} else {
		nand_writereg(ctrl, cfg_offs, tmp);
		tmp = (page_size << CFG_EXT_PAGE_SIZE_SHIFT) |
		      (block_size << CFG_EXT_BLK_SIZE_SHIFT);
		nand_writereg(ctrl, cfg_ext_offs, tmp);
	}

	tmp = nand_readreg(ctrl, acc_control_offs);
	tmp &= ~brcmnand_ecc_level_mask(ctrl);
	tmp |= cfg->ecc_level << NAND_ACC_CONTROL_ECC_SHIFT;
	tmp &= ~brcmnand_spare_area_mask(ctrl);
	tmp |= cfg->spare_area_size;
	nand_writereg(ctrl, acc_control_offs, tmp);

	brcmnand_set_sector_size_1k(host, cfg->sector_size_1k);

	/* threshold = ceil(BCH-level * 0.75) */
	brcmnand_wr_corr_thresh(host, DIV_ROUND_UP(chip->ecc.strength * 3, 4));

	return 0;
}

static void brcmnand_print_cfg(struct brcmnand_host *host,
			       char *buf, struct brcmnand_cfg *cfg)
{
	buf += sprintf(buf,
		"%lluMiB total, %uKiB blocks, %u%s pages, %uB OOB, %u-bit",
		(unsigned long long)cfg->device_size >> 20,
		cfg->block_size >> 10,
		cfg->page_size >= 1024 ? cfg->page_size >> 10 : cfg->page_size,
		cfg->page_size >= 1024 ? "KiB" : "B",
		cfg->spare_area_size, cfg->device_width);

	/* Account for Hamming ECC and for BCH 512B vs 1KiB sectors */
	if (is_hamming_ecc(host->ctrl, cfg))
		sprintf(buf, ", Hamming ECC");
	else if (cfg->sector_size_1k)
		sprintf(buf, ", BCH-%u (1KiB sector)", cfg->ecc_level << 1);
	else
		sprintf(buf, ", BCH-%u", cfg->ecc_level);
}

/*
 * Minimum number of bytes to address a page. Calculated as:
 *     roundup(log2(size / page-size) / 8)
 *
 * NB: the following does not "round up" for non-power-of-2 'size'; but this is
 *     OK because many other things will break if 'size' is irregular...
 */
static inline int get_blk_adr_bytes(u64 size, u32 writesize)
{
	return ALIGN(ilog2(size) - ilog2(writesize), 8) >> 3;
}

static int brcmnand_setup_dev(struct brcmnand_host *host)
{
	struct mtd_info *mtd = nand_to_mtd(&host->chip);
	struct nand_chip *chip = &host->chip;
	struct brcmnand_controller *ctrl = host->ctrl;
	struct brcmnand_cfg *cfg = &host->hwcfg;
	char msg[128];
	u32 offs, tmp, oob_sector;
	int ret;

	memset(cfg, 0, sizeof(*cfg));

	ret = of_property_read_u32(nand_get_flash_node(chip),
				   "brcm,nand-oob-sector-size",
				   &oob_sector);
	if (ret) {
		/* Use detected size */
		cfg->spare_area_size = mtd->oobsize /
					(mtd->writesize >> FC_SHIFT);
	} else {
		cfg->spare_area_size = oob_sector;
	}
	if (cfg->spare_area_size > ctrl->max_oob)
		cfg->spare_area_size = ctrl->max_oob;
	/*
	 * Set oobsize to be consistent with controller's spare_area_size, as
	 * the rest is inaccessible.
	 */
	mtd->oobsize = cfg->spare_area_size * (mtd->writesize >> FC_SHIFT);

	cfg->device_size = mtd->size;
	cfg->block_size = mtd->erasesize;
	cfg->page_size = mtd->writesize;
	cfg->device_width = (chip->options & NAND_BUSWIDTH_16) ? 16 : 8;
	cfg->col_adr_bytes = 2;
	cfg->blk_adr_bytes = get_blk_adr_bytes(mtd->size, mtd->writesize);

	if (chip->ecc.mode != NAND_ECC_HW) {
		dev_err(ctrl->dev, "only HW ECC supported; selected: %d\n",
			chip->ecc.mode);
		return -EINVAL;
	}

	if (chip->ecc.algo == NAND_ECC_UNKNOWN) {
		if (chip->ecc.strength == 1 && chip->ecc.size == 512)
			/* Default to Hamming for 1-bit ECC, if unspecified */
			chip->ecc.algo = NAND_ECC_HAMMING;
		else
			/* Otherwise, BCH */
			chip->ecc.algo = NAND_ECC_BCH;
	}

	if (chip->ecc.algo == NAND_ECC_HAMMING && (chip->ecc.strength != 1 ||
						   chip->ecc.size != 512)) {
		dev_err(ctrl->dev, "invalid Hamming params: %d bits per %d bytes\n",
			chip->ecc.strength, chip->ecc.size);
		return -EINVAL;
	}

	switch (chip->ecc.size) {
	case 512:
		if (chip->ecc.algo == NAND_ECC_HAMMING)
			cfg->ecc_level = 15;
		else
			cfg->ecc_level = chip->ecc.strength;
		cfg->sector_size_1k = 0;
		break;
	case 1024:
		if (!(ctrl->features & BRCMNAND_HAS_1K_SECTORS)) {
			dev_err(ctrl->dev, "1KB sectors not supported\n");
			return -EINVAL;
		}
		if (chip->ecc.strength & 0x1) {
			dev_err(ctrl->dev,
				"odd ECC not supported with 1KB sectors\n");
			return -EINVAL;
		}

		cfg->ecc_level = chip->ecc.strength >> 1;
		cfg->sector_size_1k = 1;
		break;
	default:
		dev_err(ctrl->dev, "unsupported ECC size: %d\n",
			chip->ecc.size);
		return -EINVAL;
	}

	cfg->ful_adr_bytes = cfg->blk_adr_bytes;
	if (mtd->writesize > 512)
		cfg->ful_adr_bytes += cfg->col_adr_bytes;
	else
		cfg->ful_adr_bytes += 1;

	ret = brcmnand_set_cfg(host, cfg);
	if (ret)
		return ret;

	brcmnand_set_ecc_enabled(host, 1);

	brcmnand_print_cfg(host, msg, cfg);
	dev_info(ctrl->dev, "detected %s\n", msg);

	/* Configure ACC_CONTROL */
	offs = brcmnand_cs_offset(ctrl, host->cs, BRCMNAND_CS_ACC_CONTROL);
	tmp = nand_readreg(ctrl, offs);
	tmp &= ~ACC_CONTROL_PARTIAL_PAGE;
	tmp &= ~ACC_CONTROL_RD_ERASED;

	/* We need to turn on Read from erased paged protected by ECC */
	if (ctrl->nand_version >= 0x0702)
		tmp |= ACC_CONTROL_RD_ERASED;
	tmp &= ~ACC_CONTROL_FAST_PGM_RDIN;
	if (ctrl->features & BRCMNAND_HAS_PREFETCH)
		tmp &= ~ACC_CONTROL_PREFETCH;

	nand_writereg(ctrl, offs, tmp);

	return 0;
}

static int brcmnand_attach_chip(struct nand_chip *chip)
{
	struct mtd_info *mtd = nand_to_mtd(chip);
	struct brcmnand_host *host = nand_get_controller_data(chip);
	int ret;

	chip->options |= NAND_NO_SUBPAGE_WRITE;
	/*
	 * Avoid (for instance) kmap()'d buffers from JFFS2, which we can't DMA
	 * to/from, and have nand_base pass us a bounce buffer instead, as
	 * needed.
	 */
	chip->options |= NAND_USE_BOUNCE_BUFFER;

	if (chip->bbt_options & NAND_BBT_USE_FLASH)
		chip->bbt_options |= NAND_BBT_NO_OOB;

	if (brcmnand_setup_dev(host))
		return -ENXIO;

	chip->ecc.size = host->hwcfg.sector_size_1k ? 1024 : 512;

	/* only use our internal HW threshold */
	mtd->bitflip_threshold = 1;

	ret = brcmstb_choose_ecc_layout(host);

	return ret;
}

static const struct nand_controller_ops brcmnand_controller_ops = {
	.attach_chip = brcmnand_attach_chip,
};

static int brcmnand_init_cs(struct brcmnand_host *host, struct device_node *dn)
{
	struct brcmnand_controller *ctrl = host->ctrl;
	struct platform_device *pdev = host->pdev;
	struct mtd_info *mtd;
	struct nand_chip *chip;
	int ret;
	u16 cfg_offs;

	ret = of_property_read_u32(dn, "reg", &host->cs);
	if (ret) {
		dev_err(&pdev->dev, "can't get chip-select\n");
		return -ENXIO;
	}

	mtd = nand_to_mtd(&host->chip);
	chip = &host->chip;

	nand_set_flash_node(chip, dn);
	nand_set_controller_data(chip, host);
	mtd->name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "brcmnand.%d",
				   host->cs);
	if (!mtd->name)
		return -ENOMEM;

	mtd->owner = THIS_MODULE;
	mtd->dev.parent = &pdev->dev;

	chip->IO_ADDR_R = (void __iomem *)0xdeadbeef;
	chip->IO_ADDR_W = (void __iomem *)0xdeadbeef;

	chip->cmd_ctrl = brcmnand_cmd_ctrl;
	chip->cmdfunc = brcmnand_cmdfunc;
	chip->waitfunc = brcmnand_waitfunc;
	chip->read_byte = brcmnand_read_byte;
	chip->read_buf = brcmnand_read_buf;
	chip->write_buf = brcmnand_write_buf;

	chip->ecc.mode = NAND_ECC_HW;
	chip->ecc.read_page = brcmnand_read_page;
	chip->ecc.write_page = brcmnand_write_page;
	chip->ecc.read_page_raw = brcmnand_read_page_raw;
	chip->ecc.write_page_raw = brcmnand_write_page_raw;
	chip->ecc.write_oob_raw = brcmnand_write_oob_raw;
	chip->ecc.read_oob_raw = brcmnand_read_oob_raw;
	chip->ecc.read_oob = brcmnand_read_oob;
	chip->ecc.write_oob = brcmnand_write_oob;

	chip->controller = &ctrl->controller;

	/*
	 * The bootloader might have configured 16bit mode but
	 * NAND READID command only works in 8bit mode. We force
	 * 8bit mode here to ensure that NAND READID commands works.
	 */
	cfg_offs = brcmnand_cs_offset(ctrl, host->cs, BRCMNAND_CS_CFG);
	nand_writereg(ctrl, cfg_offs,
		      nand_readreg(ctrl, cfg_offs) & ~CFG_BUS_WIDTH);

	ret = nand_scan(mtd, 1);
	if (ret)
		return ret;

	ret = mtd_device_register(mtd, NULL, 0);
	if (ret)
		nand_cleanup(chip);

	return ret;
}

static void brcmnand_save_restore_cs_config(struct brcmnand_host *host,
					    int restore)
{
	struct brcmnand_controller *ctrl = host->ctrl;
	u16 cfg_offs = brcmnand_cs_offset(ctrl, host->cs, BRCMNAND_CS_CFG);
	u16 cfg_ext_offs = brcmnand_cs_offset(ctrl, host->cs,
			BRCMNAND_CS_CFG_EXT);
	u16 acc_control_offs = brcmnand_cs_offset(ctrl, host->cs,
			BRCMNAND_CS_ACC_CONTROL);
	u16 t1_offs = brcmnand_cs_offset(ctrl, host->cs, BRCMNAND_CS_TIMING1);
	u16 t2_offs = brcmnand_cs_offset(ctrl, host->cs, BRCMNAND_CS_TIMING2);

	if (restore) {
		nand_writereg(ctrl, cfg_offs, host->hwcfg.config);
		if (cfg_offs != cfg_ext_offs)
			nand_writereg(ctrl, cfg_ext_offs,
				      host->hwcfg.config_ext);
		nand_writereg(ctrl, acc_control_offs, host->hwcfg.acc_control);
		nand_writereg(ctrl, t1_offs, host->hwcfg.timing_1);
		nand_writereg(ctrl, t2_offs, host->hwcfg.timing_2);
	} else {
		host->hwcfg.config = nand_readreg(ctrl, cfg_offs);
		if (cfg_offs != cfg_ext_offs)
			host->hwcfg.config_ext =
				nand_readreg(ctrl, cfg_ext_offs);
		host->hwcfg.acc_control = nand_readreg(ctrl, acc_control_offs);
		host->hwcfg.timing_1 = nand_readreg(ctrl, t1_offs);
		host->hwcfg.timing_2 = nand_readreg(ctrl, t2_offs);
	}
}

static int brcmnand_suspend(struct device *dev)
{
	struct brcmnand_controller *ctrl = dev_get_drvdata(dev);
	struct brcmnand_host *host;

	list_for_each_entry(host, &ctrl->host_list, node)
		brcmnand_save_restore_cs_config(host, 0);

	ctrl->nand_cs_nand_select = brcmnand_read_reg(ctrl, BRCMNAND_CS_SELECT);
	ctrl->nand_cs_nand_xor = brcmnand_read_reg(ctrl, BRCMNAND_CS_XOR);
	ctrl->corr_stat_threshold =
		brcmnand_read_reg(ctrl, BRCMNAND_CORR_THRESHOLD);

	if (has_flash_dma(ctrl))
		ctrl->flash_dma_mode = flash_dma_readl(ctrl, FLASH_DMA_MODE);

	return 0;
}

static int brcmnand_resume(struct device *dev)
{
	struct brcmnand_controller *ctrl = dev_get_drvdata(dev);
	struct brcmnand_host *host;

	if (has_flash_dma(ctrl)) {
		flash_dma_writel(ctrl, FLASH_DMA_MODE, ctrl->flash_dma_mode);
		flash_dma_writel(ctrl, FLASH_DMA_ERROR_STATUS, 0);
	}

	brcmnand_write_reg(ctrl, BRCMNAND_CS_SELECT, ctrl->nand_cs_nand_select);
	brcmnand_write_reg(ctrl, BRCMNAND_CS_XOR, ctrl->nand_cs_nand_xor);
	brcmnand_write_reg(ctrl, BRCMNAND_CORR_THRESHOLD,
			ctrl->corr_stat_threshold);
	if (ctrl->soc) {
		/* Clear/re-enable interrupt */
		ctrl->soc->ctlrdy_ack(ctrl->soc);
		ctrl->soc->ctlrdy_set_enabled(ctrl->soc, true);
	}

	list_for_each_entry(host, &ctrl->host_list, node) {
		struct nand_chip *chip = &host->chip;

		brcmnand_save_restore_cs_config(host, 1);

		/* Reset the chip, required by some chips after power-up */
		nand_reset_op(chip);
	}

	return 0;
}

const struct dev_pm_ops brcmnand_pm_ops = {
	.suspend		= brcmnand_suspend,
	.resume			= brcmnand_resume,
};
EXPORT_SYMBOL_GPL(brcmnand_pm_ops);

static const struct of_device_id brcmnand_of_match[] = {
	{ .compatible = "brcm,brcmnand-v4.0" },
	{ .compatible = "brcm,brcmnand-v5.0" },
	{ .compatible = "brcm,brcmnand-v6.0" },
	{ .compatible = "brcm,brcmnand-v6.1" },
	{ .compatible = "brcm,brcmnand-v6.2" },
	{ .compatible = "brcm,brcmnand-v7.0" },
	{ .compatible = "brcm,brcmnand-v7.1" },
	{ .compatible = "brcm,brcmnand-v7.2" },
	{},
};
MODULE_DEVICE_TABLE(of, brcmnand_of_match);

/***********************************************************************
 * Platform driver setup (per controller)
 ***********************************************************************/

int brcmnand_probe(struct platform_device *pdev, struct brcmnand_soc *soc)
{
	struct device *dev = &pdev->dev;
	struct device_node *dn = dev->of_node, *child;
	struct brcmnand_controller *ctrl;
	struct resource *res;
	int ret;

	/* We only support device-tree instantiation */
	if (!dn)
		return -ENODEV;

	if (!of_match_node(brcmnand_of_match, dn))
		return -ENODEV;

	ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL);
	if (!ctrl)
		return -ENOMEM;

	dev_set_drvdata(dev, ctrl);
	ctrl->dev = dev;

	init_completion(&ctrl->done);
	init_completion(&ctrl->dma_done);
	nand_controller_init(&ctrl->controller);
	ctrl->controller.ops = &brcmnand_controller_ops;
	INIT_LIST_HEAD(&ctrl->host_list);

	/* NAND register range */
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	ctrl->nand_base = devm_ioremap_resource(dev, res);
	if (IS_ERR(ctrl->nand_base))
		return PTR_ERR(ctrl->nand_base);

	/* Enable clock before using NAND registers */
	ctrl->clk = devm_clk_get(dev, "nand");
	if (!IS_ERR(ctrl->clk)) {
		ret = clk_prepare_enable(ctrl->clk);
		if (ret)
			return ret;
	} else {
		ret = PTR_ERR(ctrl->clk);
		if (ret == -EPROBE_DEFER)
			return ret;

		ctrl->clk = NULL;
	}

	/* Initialize NAND revision */
	ret = brcmnand_revision_init(ctrl);
	if (ret)
		goto err;

	/*
	 * Most chips have this cache at a fixed offset within 'nand' block.
	 * Some must specify this region separately.
	 */
	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand-cache");
	if (res) {
		ctrl->nand_fc = devm_ioremap_resource(dev, res);
		if (IS_ERR(ctrl->nand_fc)) {
			ret = PTR_ERR(ctrl->nand_fc);
			goto err;
		}
	} else {
		ctrl->nand_fc = ctrl->nand_base +
				ctrl->reg_offsets[BRCMNAND_FC_BASE];
	}

	/* FLASH_DMA */
	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "flash-dma");
	if (res) {
		ctrl->flash_dma_base = devm_ioremap_resource(dev, res);
		if (IS_ERR(ctrl->flash_dma_base)) {
			ret = PTR_ERR(ctrl->flash_dma_base);
			goto err;
		}

		flash_dma_writel(ctrl, FLASH_DMA_MODE, 1); /* linked-list */
		flash_dma_writel(ctrl, FLASH_DMA_ERROR_STATUS, 0);

		/* Allocate descriptor(s) */
		ctrl->dma_desc = dmam_alloc_coherent(dev,
						     sizeof(*ctrl->dma_desc),
						     &ctrl->dma_pa, GFP_KERNEL);
		if (!ctrl->dma_desc) {
			ret = -ENOMEM;
			goto err;
		}

		ctrl->dma_irq = platform_get_irq(pdev, 1);
		if ((int)ctrl->dma_irq < 0) {
			dev_err(dev, "missing FLASH_DMA IRQ\n");
			ret = -ENODEV;
			goto err;
		}

		ret = devm_request_irq(dev, ctrl->dma_irq,
				brcmnand_dma_irq, 0, DRV_NAME,
				ctrl);
		if (ret < 0) {
			dev_err(dev, "can't allocate IRQ %d: error %d\n",
					ctrl->dma_irq, ret);
			goto err;
		}

		dev_info(dev, "enabling FLASH_DMA\n");
	}

	/* Disable automatic device ID config, direct addressing */
	brcmnand_rmw_reg(ctrl, BRCMNAND_CS_SELECT,
			 CS_SELECT_AUTO_DEVICE_ID_CFG | 0xff, 0, 0);
	/* Disable XOR addressing */
	brcmnand_rmw_reg(ctrl, BRCMNAND_CS_XOR, 0xff, 0, 0);

	if (ctrl->features & BRCMNAND_HAS_WP) {
		/* Permanently disable write protection */
		if (wp_on == 2)
			brcmnand_set_wp(ctrl, false);
	} else {
		wp_on = 0;
	}

	/* IRQ */
	ctrl->irq = platform_get_irq(pdev, 0);
	if ((int)ctrl->irq < 0) {
		dev_err(dev, "no IRQ defined\n");
		ret = -ENODEV;
		goto err;
	}

	/*
	 * Some SoCs integrate this controller (e.g., its interrupt bits) in
	 * interesting ways
	 */
	if (soc) {
		ctrl->soc = soc;

		ret = devm_request_irq(dev, ctrl->irq, brcmnand_irq, 0,
				       DRV_NAME, ctrl);

		/* Enable interrupt */
		ctrl->soc->ctlrdy_ack(ctrl->soc);
		ctrl->soc->ctlrdy_set_enabled(ctrl->soc, true);
	} else {
		/* Use standard interrupt infrastructure */
		ret = devm_request_irq(dev, ctrl->irq, brcmnand_ctlrdy_irq, 0,
				       DRV_NAME, ctrl);
	}
	if (ret < 0) {
		dev_err(dev, "can't allocate IRQ %d: error %d\n",
			ctrl->irq, ret);
		goto err;
	}

	for_each_available_child_of_node(dn, child) {
		if (of_device_is_compatible(child, "brcm,nandcs")) {
			struct brcmnand_host *host;

			host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
			if (!host) {
				of_node_put(child);
				ret = -ENOMEM;
				goto err;
			}
			host->pdev = pdev;
			host->ctrl = ctrl;

			ret = brcmnand_init_cs(host, child);
			if (ret) {
				devm_kfree(dev, host);
				continue; /* Try all chip-selects */
			}

			list_add_tail(&host->node, &ctrl->host_list);
		}
	}

	/* No chip-selects could initialize properly */
	if (list_empty(&ctrl->host_list)) {
		ret = -ENODEV;
		goto err;
	}

	return 0;

err:
	clk_disable_unprepare(ctrl->clk);
	return ret;

}
EXPORT_SYMBOL_GPL(brcmnand_probe);

int brcmnand_remove(struct platform_device *pdev)
{
	struct brcmnand_controller *ctrl = dev_get_drvdata(&pdev->dev);
	struct brcmnand_host *host;

	list_for_each_entry(host, &ctrl->host_list, node)
		nand_release(nand_to_mtd(&host->chip));

	clk_disable_unprepare(ctrl->clk);

	dev_set_drvdata(&pdev->dev, NULL);

	return 0;
}
EXPORT_SYMBOL_GPL(brcmnand_remove);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Kevin Cernekee");
MODULE_AUTHOR("Brian Norris");
MODULE_DESCRIPTION("NAND driver for Broadcom chips");
MODULE_ALIAS("platform:brcmnand");