summaryrefslogtreecommitdiffstats
path: root/drivers/vme/vme.c
blob: 53e87af8e0b8b1310f1a0e79cc074563ca797dd9 (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
/*
 * VME Bridge Framework
 *
 * Author: Martyn Welch <martyn.welch@ge.com>
 * Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc.
 *
 * Based on work by Tom Armistead and Ajit Prem
 * Copyright 2004 Motorola Inc.
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <linux/init.h>
#include <linux/export.h>
#include <linux/mm.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/pci.h>
#include <linux/poll.h>
#include <linux/highmem.h>
#include <linux/interrupt.h>
#include <linux/pagemap.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/syscalls.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/vme.h>

#include "vme_bridge.h"

/* Bitmask and list of registered buses both protected by common mutex */
static unsigned int vme_bus_numbers;
static LIST_HEAD(vme_bus_list);
static DEFINE_MUTEX(vme_buses_lock);

static int __init vme_init(void);

static struct vme_dev *dev_to_vme_dev(struct device *dev)
{
	return container_of(dev, struct vme_dev, dev);
}

/*
 * Find the bridge that the resource is associated with.
 */
static struct vme_bridge *find_bridge(struct vme_resource *resource)
{
	/* Get list to search */
	switch (resource->type) {
	case VME_MASTER:
		return list_entry(resource->entry, struct vme_master_resource,
			list)->parent;
		break;
	case VME_SLAVE:
		return list_entry(resource->entry, struct vme_slave_resource,
			list)->parent;
		break;
	case VME_DMA:
		return list_entry(resource->entry, struct vme_dma_resource,
			list)->parent;
		break;
	case VME_LM:
		return list_entry(resource->entry, struct vme_lm_resource,
			list)->parent;
		break;
	default:
		printk(KERN_ERR "Unknown resource type\n");
		return NULL;
		break;
	}
}

/**
 * vme_free_consistent - Allocate contiguous memory.
 * @resource: Pointer to VME resource.
 * @size: Size of allocation required.
 * @dma: Pointer to variable to store physical address of allocation.
 *
 * Allocate a contiguous block of memory for use by the driver. This is used to
 * create the buffers for the slave windows.
 *
 * Return: Virtual address of allocation on success, NULL on failure.
 */
void *vme_alloc_consistent(struct vme_resource *resource, size_t size,
	dma_addr_t *dma)
{
	struct vme_bridge *bridge;

	if (resource == NULL) {
		printk(KERN_ERR "No resource\n");
		return NULL;
	}

	bridge = find_bridge(resource);
	if (bridge == NULL) {
		printk(KERN_ERR "Can't find bridge\n");
		return NULL;
	}

	if (bridge->parent == NULL) {
		printk(KERN_ERR "Dev entry NULL for bridge %s\n", bridge->name);
		return NULL;
	}

	if (bridge->alloc_consistent == NULL) {
		printk(KERN_ERR "alloc_consistent not supported by bridge %s\n",
		       bridge->name);
		return NULL;
	}

	return bridge->alloc_consistent(bridge->parent, size, dma);
}
EXPORT_SYMBOL(vme_alloc_consistent);

/**
 * vme_free_consistent - Free previously allocated memory.
 * @resource: Pointer to VME resource.
 * @size: Size of allocation to free.
 * @vaddr: Virtual address of allocation.
 * @dma: Physical address of allocation.
 *
 * Free previously allocated block of contiguous memory.
 */
void vme_free_consistent(struct vme_resource *resource, size_t size,
	void *vaddr, dma_addr_t dma)
{
	struct vme_bridge *bridge;

	if (resource == NULL) {
		printk(KERN_ERR "No resource\n");
		return;
	}

	bridge = find_bridge(resource);
	if (bridge == NULL) {
		printk(KERN_ERR "Can't find bridge\n");
		return;
	}

	if (bridge->parent == NULL) {
		printk(KERN_ERR "Dev entry NULL for bridge %s\n", bridge->name);
		return;
	}

	if (bridge->free_consistent == NULL) {
		printk(KERN_ERR "free_consistent not supported by bridge %s\n",
		       bridge->name);
		return;
	}

	bridge->free_consistent(bridge->parent, size, vaddr, dma);
}
EXPORT_SYMBOL(vme_free_consistent);

/**
 * vme_get_size - Helper function returning size of a VME window
 * @resource: Pointer to VME slave or master resource.
 *
 * Determine the size of the VME window provided. This is a helper
 * function, wrappering the call to vme_master_get or vme_slave_get
 * depending on the type of window resource handed to it.
 *
 * Return: Size of the window on success, zero on failure.
 */
size_t vme_get_size(struct vme_resource *resource)
{
	int enabled, retval;
	unsigned long long base, size;
	dma_addr_t buf_base;
	u32 aspace, cycle, dwidth;

	switch (resource->type) {
	case VME_MASTER:
		retval = vme_master_get(resource, &enabled, &base, &size,
			&aspace, &cycle, &dwidth);
		if (retval)
			return 0;

		return size;
		break;
	case VME_SLAVE:
		retval = vme_slave_get(resource, &enabled, &base, &size,
			&buf_base, &aspace, &cycle);
		if (retval)
			return 0;

		return size;
		break;
	case VME_DMA:
		return 0;
		break;
	default:
		printk(KERN_ERR "Unknown resource type\n");
		return 0;
		break;
	}
}
EXPORT_SYMBOL(vme_get_size);

int vme_check_window(u32 aspace, unsigned long long vme_base,
		     unsigned long long size)
{
	int retval = 0;

	switch (aspace) {
	case VME_A16:
		if (((vme_base + size) > VME_A16_MAX) ||
				(vme_base > VME_A16_MAX))
			retval = -EFAULT;
		break;
	case VME_A24:
		if (((vme_base + size) > VME_A24_MAX) ||
				(vme_base > VME_A24_MAX))
			retval = -EFAULT;
		break;
	case VME_A32:
		if (((vme_base + size) > VME_A32_MAX) ||
				(vme_base > VME_A32_MAX))
			retval = -EFAULT;
		break;
	case VME_A64:
		if ((size != 0) && (vme_base > U64_MAX + 1 - size))
			retval = -EFAULT;
		break;
	case VME_CRCSR:
		if (((vme_base + size) > VME_CRCSR_MAX) ||
				(vme_base > VME_CRCSR_MAX))
			retval = -EFAULT;
		break;
	case VME_USER1:
	case VME_USER2:
	case VME_USER3:
	case VME_USER4:
		/* User Defined */
		break;
	default:
		printk(KERN_ERR "Invalid address space\n");
		retval = -EINVAL;
		break;
	}

	return retval;
}
EXPORT_SYMBOL(vme_check_window);

static u32 vme_get_aspace(int am)
{
	switch (am) {
	case 0x29:
	case 0x2D:
		return VME_A16;
	case 0x38:
	case 0x39:
	case 0x3A:
	case 0x3B:
	case 0x3C:
	case 0x3D:
	case 0x3E:
	case 0x3F:
		return VME_A24;
	case 0x8:
	case 0x9:
	case 0xA:
	case 0xB:
	case 0xC:
	case 0xD:
	case 0xE:
	case 0xF:
		return VME_A32;
	case 0x0:
	case 0x1:
	case 0x3:
		return VME_A64;
	}

	return 0;
}

/**
 * vme_slave_request - Request a VME slave window resource.
 * @vdev: Pointer to VME device struct vme_dev assigned to driver instance.
 * @address: Required VME address space.
 * @cycle: Required VME data transfer cycle type.
 *
 * Request use of a VME window resource capable of being set for the requested
 * address space and data transfer cycle.
 *
 * Return: Pointer to VME resource on success, NULL on failure.
 */
struct vme_resource *vme_slave_request(struct vme_dev *vdev, u32 address,
	u32 cycle)
{
	struct vme_bridge *bridge;
	struct list_head *slave_pos = NULL;
	struct vme_slave_resource *allocated_image = NULL;
	struct vme_slave_resource *slave_image = NULL;
	struct vme_resource *resource = NULL;

	bridge = vdev->bridge;
	if (bridge == NULL) {
		printk(KERN_ERR "Can't find VME bus\n");
		goto err_bus;
	}

	/* Loop through slave resources */
	list_for_each(slave_pos, &bridge->slave_resources) {
		slave_image = list_entry(slave_pos,
			struct vme_slave_resource, list);

		if (slave_image == NULL) {
			printk(KERN_ERR "Registered NULL Slave resource\n");
			continue;
		}

		/* Find an unlocked and compatible image */
		mutex_lock(&slave_image->mtx);
		if (((slave_image->address_attr & address) == address) &&
			((slave_image->cycle_attr & cycle) == cycle) &&
			(slave_image->locked == 0)) {

			slave_image->locked = 1;
			mutex_unlock(&slave_image->mtx);
			allocated_image = slave_image;
			break;
		}
		mutex_unlock(&slave_image->mtx);
	}

	/* No free image */
	if (allocated_image == NULL)
		goto err_image;

	resource = kmalloc(sizeof(struct vme_resource), GFP_KERNEL);
	if (!resource)
		goto err_alloc;

	resource->type = VME_SLAVE;
	resource->entry = &allocated_image->list;

	return resource;

err_alloc:
	/* Unlock image */
	mutex_lock(&slave_image->mtx);
	slave_image->locked = 0;
	mutex_unlock(&slave_image->mtx);
err_image:
err_bus:
	return NULL;
}
EXPORT_SYMBOL(vme_slave_request);

/**
 * vme_slave_set - Set VME slave window configuration.
 * @resource: Pointer to VME slave resource.
 * @enabled: State to which the window should be configured.
 * @vme_base: Base address for the window.
 * @size: Size of the VME window.
 * @buf_base: Based address of buffer used to provide VME slave window storage.
 * @aspace: VME address space for the VME window.
 * @cycle: VME data transfer cycle type for the VME window.
 *
 * Set configuration for provided VME slave window.
 *
 * Return: Zero on success, -EINVAL if operation is not supported on this
 *         device, if an invalid resource has been provided or invalid
 *         attributes are provided. Hardware specific errors may also be
 *         returned.
 */
int vme_slave_set(struct vme_resource *resource, int enabled,
	unsigned long long vme_base, unsigned long long size,
	dma_addr_t buf_base, u32 aspace, u32 cycle)
{
	struct vme_bridge *bridge = find_bridge(resource);
	struct vme_slave_resource *image;
	int retval;

	if (resource->type != VME_SLAVE) {
		printk(KERN_ERR "Not a slave resource\n");
		return -EINVAL;
	}

	image = list_entry(resource->entry, struct vme_slave_resource, list);

	if (bridge->slave_set == NULL) {
		printk(KERN_ERR "Function not supported\n");
		return -ENOSYS;
	}

	if (!(((image->address_attr & aspace) == aspace) &&
		((image->cycle_attr & cycle) == cycle))) {
		printk(KERN_ERR "Invalid attributes\n");
		return -EINVAL;
	}

	retval = vme_check_window(aspace, vme_base, size);
	if (retval)
		return retval;

	return bridge->slave_set(image, enabled, vme_base, size, buf_base,
		aspace, cycle);
}
EXPORT_SYMBOL(vme_slave_set);

/**
 * vme_slave_get - Retrieve VME slave window configuration.
 * @resource: Pointer to VME slave resource.
 * @enabled: Pointer to variable for storing state.
 * @vme_base: Pointer to variable for storing window base address.
 * @size: Pointer to variable for storing window size.
 * @buf_base: Pointer to variable for storing slave buffer base address.
 * @aspace: Pointer to variable for storing VME address space.
 * @cycle: Pointer to variable for storing VME data transfer cycle type.
 *
 * Return configuration for provided VME slave window.
 *
 * Return: Zero on success, -EINVAL if operation is not supported on this
 *         device or if an invalid resource has been provided.
 */
int vme_slave_get(struct vme_resource *resource, int *enabled,
	unsigned long long *vme_base, unsigned long long *size,
	dma_addr_t *buf_base, u32 *aspace, u32 *cycle)
{
	struct vme_bridge *bridge = find_bridge(resource);
	struct vme_slave_resource *image;

	if (resource->type != VME_SLAVE) {
		printk(KERN_ERR "Not a slave resource\n");
		return -EINVAL;
	}

	image = list_entry(resource->entry, struct vme_slave_resource, list);

	if (bridge->slave_get == NULL) {
		printk(KERN_ERR "vme_slave_get not supported\n");
		return -EINVAL;
	}

	return bridge->slave_get(image, enabled, vme_base, size, buf_base,
		aspace, cycle);
}
EXPORT_SYMBOL(vme_slave_get);

/**
 * vme_slave_free - Free VME slave window
 * @resource: Pointer to VME slave resource.
 *
 * Free the provided slave resource so that it may be reallocated.
 */
void vme_slave_free(struct vme_resource *resource)
{
	struct vme_slave_resource *slave_image;

	if (resource->type != VME_SLAVE) {
		printk(KERN_ERR "Not a slave resource\n");
		return;
	}

	slave_image = list_entry(resource->entry, struct vme_slave_resource,
		list);
	if (slave_image == NULL) {
		printk(KERN_ERR "Can't find slave resource\n");
		return;
	}

	/* Unlock image */
	mutex_lock(&slave_image->mtx);
	if (slave_image->locked == 0)
		printk(KERN_ERR "Image is already free\n");

	slave_image->locked = 0;
	mutex_unlock(&slave_image->mtx);

	/* Free up resource memory */
	kfree(resource);
}
EXPORT_SYMBOL(vme_slave_free);

/**
 * vme_master_request - Request a VME master window resource.
 * @vdev: Pointer to VME device struct vme_dev assigned to driver instance.
 * @address: Required VME address space.
 * @cycle: Required VME data transfer cycle type.
 * @dwidth: Required VME data transfer width.
 *
 * Request use of a VME window resource capable of being set for the requested
 * address space, data transfer cycle and width.
 *
 * Return: Pointer to VME resource on success, NULL on failure.
 */
struct vme_resource *vme_master_request(struct vme_dev *vdev, u32 address,
	u32 cycle, u32 dwidth)
{
	struct vme_bridge *bridge;
	struct list_head *master_pos = NULL;
	struct vme_master_resource *allocated_image = NULL;
	struct vme_master_resource *master_image = NULL;
	struct vme_resource *resource = NULL;

	bridge = vdev->bridge;
	if (bridge == NULL) {
		printk(KERN_ERR "Can't find VME bus\n");
		goto err_bus;
	}

	/* Loop through master resources */
	list_for_each(master_pos, &bridge->master_resources) {
		master_image = list_entry(master_pos,
			struct vme_master_resource, list);

		if (master_image == NULL) {
			printk(KERN_WARNING "Registered NULL master resource\n");
			continue;
		}

		/* Find an unlocked and compatible image */
		spin_lock(&master_image->lock);
		if (((master_image->address_attr & address) == address) &&
			((master_image->cycle_attr & cycle) == cycle) &&
			((master_image->width_attr & dwidth) == dwidth) &&
			(master_image->locked == 0)) {

			master_image->locked = 1;
			spin_unlock(&master_image->lock);
			allocated_image = master_image;
			break;
		}
		spin_unlock(&master_image->lock);
	}

	/* Check to see if we found a resource */
	if (allocated_image == NULL) {
		printk(KERN_ERR "Can't find a suitable resource\n");
		goto err_image;
	}

	resource = kmalloc(sizeof(struct vme_resource), GFP_KERNEL);
	if (!resource)
		goto err_alloc;

	resource->type = VME_MASTER;
	resource->entry = &allocated_image->list;

	return resource;

err_alloc:
	/* Unlock image */
	spin_lock(&master_image->lock);
	master_image->locked = 0;
	spin_unlock(&master_image->lock);
err_image:
err_bus:
	return NULL;
}
EXPORT_SYMBOL(vme_master_request);

/**
 * vme_master_set - Set VME master window configuration.
 * @resource: Pointer to VME master resource.
 * @enabled: State to which the window should be configured.
 * @vme_base: Base address for the window.
 * @size: Size of the VME window.
 * @aspace: VME address space for the VME window.
 * @cycle: VME data transfer cycle type for the VME window.
 * @dwidth: VME data transfer width for the VME window.
 *
 * Set configuration for provided VME master window.
 *
 * Return: Zero on success, -EINVAL if operation is not supported on this
 *         device, if an invalid resource has been provided or invalid
 *         attributes are provided. Hardware specific errors may also be
 *         returned.
 */
int vme_master_set(struct vme_resource *resource, int enabled,
	unsigned long long vme_base, unsigned long long size, u32 aspace,
	u32 cycle, u32 dwidth)
{
	struct vme_bridge *bridge = find_bridge(resource);
	struct vme_master_resource *image;
	int retval;

	if (resource->type != VME_MASTER) {
		printk(KERN_ERR "Not a master resource\n");
		return -EINVAL;
	}

	image = list_entry(resource->entry, struct vme_master_resource, list);

	if (bridge->master_set == NULL) {
		printk(KERN_WARNING "vme_master_set not supported\n");
		return -EINVAL;
	}

	if (!(((image->address_attr & aspace) == aspace) &&
		((image->cycle_attr & cycle) == cycle) &&
		((image->width_attr & dwidth) == dwidth))) {
		printk(KERN_WARNING "Invalid attributes\n");
		return -EINVAL;
	}

	retval = vme_check_window(aspace, vme_base, size);
	if (retval)
		return retval;

	return bridge->master_set(image, enabled, vme_base, size, aspace,
		cycle, dwidth);
}
EXPORT_SYMBOL(vme_master_set);

/**
 * vme_master_get - Retrieve VME master window configuration.
 * @resource: Pointer to VME master resource.
 * @enabled: Pointer to variable for storing state.
 * @vme_base: Pointer to variable for storing window base address.
 * @size: Pointer to variable for storing window size.
 * @aspace: Pointer to variable for storing VME address space.
 * @cycle: Pointer to variable for storing VME data transfer cycle type.
 * @dwidth: Pointer to variable for storing VME data transfer width.
 *
 * Return configuration for provided VME master window.
 *
 * Return: Zero on success, -EINVAL if operation is not supported on this
 *         device or if an invalid resource has been provided.
 */
int vme_master_get(struct vme_resource *resource, int *enabled,
	unsigned long long *vme_base, unsigned long long *size, u32 *aspace,
	u32 *cycle, u32 *dwidth)
{
	struct vme_bridge *bridge = find_bridge(resource);
	struct vme_master_resource *image;

	if (resource->type != VME_MASTER) {
		printk(KERN_ERR "Not a master resource\n");
		return -EINVAL;
	}

	image = list_entry(resource->entry, struct vme_master_resource, list);

	if (bridge->master_get == NULL) {
		printk(KERN_WARNING "%s not supported\n", __func__);
		return -EINVAL;
	}

	return bridge->master_get(image, enabled, vme_base, size, aspace,
		cycle, dwidth);
}
EXPORT_SYMBOL(vme_master_get);

/**
 * vme_master_write - Read data from VME space into a buffer.
 * @resource: Pointer to VME master resource.
 * @buf: Pointer to buffer where data should be transferred.
 * @count: Number of bytes to transfer.
 * @offset: Offset into VME master window at which to start transfer.
 *
 * Perform read of count bytes of data from location on VME bus which maps into
 * the VME master window at offset to buf.
 *
 * Return: Number of bytes read, -EINVAL if resource is not a VME master
 *         resource or read operation is not supported. -EFAULT returned if
 *         invalid offset is provided. Hardware specific errors may also be
 *         returned.
 */
ssize_t vme_master_read(struct vme_resource *resource, void *buf, size_t count,
	loff_t offset)
{
	struct vme_bridge *bridge = find_bridge(resource);
	struct vme_master_resource *image;
	size_t length;

	if (bridge->master_read == NULL) {
		printk(KERN_WARNING "Reading from resource not supported\n");
		return -EINVAL;
	}

	if (resource->type != VME_MASTER) {
		printk(KERN_ERR "Not a master resource\n");
		return -EINVAL;
	}

	image = list_entry(resource->entry, struct vme_master_resource, list);

	length = vme_get_size(resource);

	if (offset > length) {
		printk(KERN_WARNING "Invalid Offset\n");
		return -EFAULT;
	}

	if ((offset + count) > length)
		count = length - offset;

	return bridge->master_read(image, buf, count, offset);

}
EXPORT_SYMBOL(vme_master_read);

/**
 * vme_master_write - Write data out to VME space from a buffer.
 * @resource: Pointer to VME master resource.
 * @buf: Pointer to buffer holding data to transfer.
 * @count: Number of bytes to transfer.
 * @offset: Offset into VME master window at which to start transfer.
 *
 * Perform write of count bytes of data from buf to location on VME bus which
 * maps into the VME master window at offset.
 *
 * Return: Number of bytes written, -EINVAL if resource is not a VME master
 *         resource or write operation is not supported. -EFAULT returned if
 *         invalid offset is provided. Hardware specific errors may also be
 *         returned.
 */
ssize_t vme_master_write(struct vme_resource *resource, void *buf,
	size_t count, loff_t offset)
{
	struct vme_bridge *bridge = find_bridge(resource);
	struct vme_master_resource *image;
	size_t length;

	if (bridge->master_write == NULL) {
		printk(KERN_WARNING "Writing to resource not supported\n");
		return -EINVAL;
	}

	if (resource->type != VME_MASTER) {
		printk(KERN_ERR "Not a master resource\n");
		return -EINVAL;
	}

	image = list_entry(resource->entry, struct vme_master_resource, list);

	length = vme_get_size(resource);

	if (offset > length) {
		printk(KERN_WARNING "Invalid Offset\n");
		return -EFAULT;
	}

	if ((offset + count) > length)
		count = length - offset;

	return bridge->master_write(image, buf, count, offset);
}
EXPORT_SYMBOL(vme_master_write);

/**
 * vme_master_rmw - Perform read-modify-write cycle.
 * @resource: Pointer to VME master resource.
 * @mask: Bits to be compared and swapped in operation.
 * @compare: Bits to be compared with data read from offset.
 * @swap: Bits to be swapped in data read from offset.
 * @offset: Offset into VME master window at which to perform operation.
 *
 * Perform read-modify-write cycle on provided location:
 * - Location on VME bus is read.
 * - Bits selected by mask are compared with compare.
 * - Where a selected bit matches that in compare and are selected in swap,
 * the bit is swapped.
 * - Result written back to location on VME bus.
 *
 * Return: Bytes written on success, -EINVAL if resource is not a VME master
 *         resource or RMW operation is not supported. Hardware specific
 *         errors may also be returned.
 */
unsigned int vme_master_rmw(struct vme_resource *resource, unsigned int mask,
	unsigned int compare, unsigned int swap, loff_t offset)
{
	struct vme_bridge *bridge = find_bridge(resource);
	struct vme_master_resource *image;

	if (bridge->master_rmw == NULL) {
		printk(KERN_WARNING "Writing to resource not supported\n");
		return -EINVAL;
	}

	if (resource->type != VME_MASTER) {
		printk(KERN_ERR "Not a master resource\n");
		return -EINVAL;
	}

	image = list_entry(resource->entry, struct vme_master_resource, list);

	return bridge->master_rmw(image, mask, compare, swap, offset);
}
EXPORT_SYMBOL(vme_master_rmw);

/**
 * vme_master_mmap - Mmap region of VME master window.
 * @resource: Pointer to VME master resource.
 * @vma: Pointer to definition of user mapping.
 *
 * Memory map a region of the VME master window into user space.
 *
 * Return: Zero on success, -EINVAL if resource is not a VME master
 *         resource or -EFAULT if map exceeds window size. Other generic mmap
 *         errors may also be returned.
 */
int vme_master_mmap(struct vme_resource *resource, struct vm_area_struct *vma)
{
	struct vme_master_resource *image;
	phys_addr_t phys_addr;
	unsigned long vma_size;

	if (resource->type != VME_MASTER) {
		pr_err("Not a master resource\n");
		return -EINVAL;
	}

	image = list_entry(resource->entry, struct vme_master_resource, list);
	phys_addr = image->bus_resource.start + (vma->vm_pgoff << PAGE_SHIFT);
	vma_size = vma->vm_end - vma->vm_start;

	if (phys_addr + vma_size > image->bus_resource.end + 1) {
		pr_err("Map size cannot exceed the window size\n");
		return -EFAULT;
	}

	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);

	return vm_iomap_memory(vma, phys_addr, vma->vm_end - vma->vm_start);
}
EXPORT_SYMBOL(vme_master_mmap);

/**
 * vme_master_free - Free VME master window
 * @resource: Pointer to VME master resource.
 *
 * Free the provided master resource so that it may be reallocated.
 */
void vme_master_free(struct vme_resource *resource)
{
	struct vme_master_resource *master_image;

	if (resource->type != VME_MASTER) {
		printk(KERN_ERR "Not a master resource\n");
		return;
	}

	master_image = list_entry(resource->entry, struct vme_master_resource,
		list);
	if (master_image == NULL) {
		printk(KERN_ERR "Can't find master resource\n");
		return;
	}

	/* Unlock image */
	spin_lock(&master_image->lock);
	if (master_image->locked == 0)
		printk(KERN_ERR "Image is already free\n");

	master_image->locked = 0;
	spin_unlock(&master_image->lock);

	/* Free up resource memory */
	kfree(resource);
}
EXPORT_SYMBOL(vme_master_free);

/**
 * vme_dma_request - Request a DMA controller.
 * @vdev: Pointer to VME device struct vme_dev assigned to driver instance.
 * @route: Required src/destination combination.
 *
 * Request a VME DMA controller with capability to perform transfers bewteen
 * requested source/destination combination.
 *
 * Return: Pointer to VME DMA resource on success, NULL on failure.
 */
struct vme_resource *vme_dma_request(struct vme_dev *vdev, u32 route)
{
	struct vme_bridge *bridge;
	struct list_head *dma_pos = NULL;
	struct vme_dma_resource *allocated_ctrlr = NULL;
	struct vme_dma_resource *dma_ctrlr = NULL;
	struct vme_resource *resource = NULL;

	/* XXX Not checking resource attributes */
	printk(KERN_ERR "No VME resource Attribute tests done\n");

	bridge = vdev->bridge;
	if (bridge == NULL) {
		printk(KERN_ERR "Can't find VME bus\n");
		goto err_bus;
	}

	/* Loop through DMA resources */
	list_for_each(dma_pos, &bridge->dma_resources) {
		dma_ctrlr = list_entry(dma_pos,
			struct vme_dma_resource, list);

		if (dma_ctrlr == NULL) {
			printk(KERN_ERR "Registered NULL DMA resource\n");
			continue;
		}

		/* Find an unlocked and compatible controller */
		mutex_lock(&dma_ctrlr->mtx);
		if (((dma_ctrlr->route_attr & route) == route) &&
			(dma_ctrlr->locked == 0)) {

			dma_ctrlr->locked = 1;
			mutex_unlock(&dma_ctrlr->mtx);
			allocated_ctrlr = dma_ctrlr;
			break;
		}
		mutex_unlock(&dma_ctrlr->mtx);
	}

	/* Check to see if we found a resource */
	if (allocated_ctrlr == NULL)
		goto err_ctrlr;

	resource = kmalloc(sizeof(struct vme_resource), GFP_KERNEL);
	if (!resource)
		goto err_alloc;

	resource->type = VME_DMA;
	resource->entry = &allocated_ctrlr->list;

	return resource;

err_alloc:
	/* Unlock image */
	mutex_lock(&dma_ctrlr->mtx);
	dma_ctrlr->locked = 0;
	mutex_unlock(&dma_ctrlr->mtx);
err_ctrlr:
err_bus:
	return NULL;
}
EXPORT_SYMBOL(vme_dma_request);

/**
 * vme_new_dma_list - Create new VME DMA list.
 * @resource: Pointer to VME DMA resource.
 *
 * Create a new VME DMA list. It is the responsibility of the user to free
 * the list once it is no longer required with vme_dma_list_free().
 *
 * Return: Pointer to new VME DMA list, NULL on allocation failure or invalid
 *         VME DMA resource.
 */
struct vme_dma_list *vme_new_dma_list(struct vme_resource *resource)
{
	struct vme_dma_resource *ctrlr;
	struct vme_dma_list *dma_list;

	if (resource->type != VME_DMA) {
		printk(KERN_ERR "Not a DMA resource\n");
		return NULL;
	}

	ctrlr = list_entry(resource->entry, struct vme_dma_resource, list);

	dma_list = kmalloc(sizeof(struct vme_dma_list), GFP_KERNEL);
	if (!dma_list)
		return NULL;

	INIT_LIST_HEAD(&dma_list->entries);
	dma_list->parent = ctrlr;
	mutex_init(&dma_list->mtx);

	return dma_list;
}
EXPORT_SYMBOL(vme_new_dma_list);

/**
 * vme_dma_pattern_attribute - Create "Pattern" type VME DMA list attribute.
 * @pattern: Value to use used as pattern
 * @type: Type of pattern to be written.
 *
 * Create VME DMA list attribute for pattern generation. It is the
 * responsibility of the user to free used attributes using
 * vme_dma_free_attribute().
 *
 * Return: Pointer to VME DMA attribute, NULL on failure.
 */
struct vme_dma_attr *vme_dma_pattern_attribute(u32 pattern, u32 type)
{
	struct vme_dma_attr *attributes;
	struct vme_dma_pattern *pattern_attr;

	attributes = kmalloc(sizeof(struct vme_dma_attr), GFP_KERNEL);
	if (!attributes)
		goto err_attr;

	pattern_attr = kmalloc(sizeof(struct vme_dma_pattern), GFP_KERNEL);
	if (!pattern_attr)
		goto err_pat;

	attributes->type = VME_DMA_PATTERN;
	attributes->private = (void *)pattern_attr;

	pattern_attr->pattern = pattern;
	pattern_attr->type = type;

	return attributes;

err_pat:
	kfree(attributes);
err_attr:
	return NULL;
}
EXPORT_SYMBOL(vme_dma_pattern_attribute);

/**
 * vme_dma_pci_attribute - Create "PCI" type VME DMA list attribute.
 * @address: PCI base address for DMA transfer.
 *
 * Create VME DMA list attribute pointing to a location on PCI for DMA
 * transfers. It is the responsibility of the user to free used attributes
 * using vme_dma_free_attribute().
 *
 * Return: Pointer to VME DMA attribute, NULL on failure.
 */
struct vme_dma_attr *vme_dma_pci_attribute(dma_addr_t address)
{
	struct vme_dma_attr *attributes;
	struct vme_dma_pci *pci_attr;

	/* XXX Run some sanity checks here */

	attributes = kmalloc(sizeof(struct vme_dma_attr), GFP_KERNEL);
	if (!attributes)
		goto err_attr;

	pci_attr = kmalloc(sizeof(struct vme_dma_pci), GFP_KERNEL);
	if (!pci_attr)
		goto err_pci;

	attributes->type = VME_DMA_PCI;
	attributes->private = (void *)pci_attr;

	pci_attr->address = address;

	return attributes;

err_pci:
	kfree(attributes);
err_attr:
	return NULL;
}
EXPORT_SYMBOL(vme_dma_pci_attribute);

/**
 * vme_dma_vme_attribute - Create "VME" type VME DMA list attribute.
 * @address: VME base address for DMA transfer.
 * @aspace: VME address space to use for DMA transfer.
 * @cycle: VME bus cycle to use for DMA transfer.
 * @dwidth: VME data width to use for DMA transfer.
 *
 * Create VME DMA list attribute pointing to a location on the VME bus for DMA
 * transfers. It is the responsibility of the user to free used attributes
 * using vme_dma_free_attribute().
 *
 * Return: Pointer to VME DMA attribute, NULL on failure.
 */
struct vme_dma_attr *vme_dma_vme_attribute(unsigned long long address,
	u32 aspace, u32 cycle, u32 dwidth)
{
	struct vme_dma_attr *attributes;
	struct vme_dma_vme *vme_attr;

	attributes = kmalloc(
		sizeof(struct vme_dma_attr), GFP_KERNEL);
	if (!attributes)
		goto err_attr;

	vme_attr = kmalloc(sizeof(struct vme_dma_vme), GFP_KERNEL);
	if (!vme_attr)
		goto err_vme;

	attributes->type = VME_DMA_VME;
	attributes->private = (void *)vme_attr;

	vme_attr->address = address;
	vme_attr->aspace = aspace;
	vme_attr->cycle = cycle;
	vme_attr->dwidth = dwidth;

	return attributes;

err_vme:
	kfree(attributes);
err_attr:
	return NULL;
}
EXPORT_SYMBOL(vme_dma_vme_attribute);

/**
 * vme_dma_free_attribute - Free DMA list attribute.
 * @attributes: Pointer to DMA list attribute.
 *
 * Free VME DMA list attribute. VME DMA list attributes can be safely freed
 * once vme_dma_list_add() has returned.
 */
void vme_dma_free_attribute(struct vme_dma_attr *attributes)
{
	kfree(attributes->private);
	kfree(attributes);
}
EXPORT_SYMBOL(vme_dma_free_attribute);

/**
 * vme_dma_list_add - Add enty to a VME DMA list.
 * @list: Pointer to VME list.
 * @src: Pointer to DMA list attribute to use as source.
 * @dest: Pointer to DMA list attribute to use as destination.
 * @count: Number of bytes to transfer.
 *
 * Add an entry to the provided VME DMA list. Entry requires pointers to source
 * and destination DMA attributes and a count.
 *
 * Please note, the attributes supported as source and destinations for
 * transfers are hardware dependent.
 *
 * Return: Zero on success, -EINVAL if operation is not supported on this
 *         device or if the link list has already been submitted for execution.
 *         Hardware specific errors also possible.
 */
int vme_dma_list_add(struct vme_dma_list *list, struct vme_dma_attr *src,
	struct vme_dma_attr *dest, size_t count)
{
	struct vme_bridge *bridge = list->parent->parent;
	int retval;

	if (bridge->dma_list_add == NULL) {
		printk(KERN_WARNING "Link List DMA generation not supported\n");
		return -EINVAL;
	}

	if (!mutex_trylock(&list->mtx)) {
		printk(KERN_ERR "Link List already submitted\n");
		return -EINVAL;
	}

	retval = bridge->dma_list_add(list, src, dest, count);

	mutex_unlock(&list->mtx);

	return retval;
}
EXPORT_SYMBOL(vme_dma_list_add);

/**
 * vme_dma_list_exec - Queue a VME DMA list for execution.
 * @list: Pointer to VME list.
 *
 * Queue the provided VME DMA list for execution. The call will return once the
 * list has been executed.
 *
 * Return: Zero on success, -EINVAL if operation is not supported on this
 *         device. Hardware specific errors also possible.
 */
int vme_dma_list_exec(struct vme_dma_list *list)
{
	struct vme_bridge *bridge = list->parent->parent;
	int retval;

	if (bridge->dma_list_exec == NULL) {
		printk(KERN_ERR "Link List DMA execution not supported\n");
		return -EINVAL;
	}

	mutex_lock(&list->mtx);

	retval = bridge->dma_list_exec(list);

	mutex_unlock(&list->mtx);

	return retval;
}
EXPORT_SYMBOL(vme_dma_list_exec);

/**
 * vme_dma_list_free - Free a VME DMA list.
 * @list: Pointer to VME list.
 *
 * Free the provided DMA list and all its entries.
 *
 * Return: Zero on success, -EINVAL on invalid VME resource, -EBUSY if resource
 *         is still in use. Hardware specific errors also possible.
 */
int vme_dma_list_free(struct vme_dma_list *list)
{
	struct vme_bridge *bridge = list->parent->parent;
	int retval;

	if (bridge->dma_list_empty == NULL) {
		printk(KERN_WARNING "Emptying of Link Lists not supported\n");
		return -EINVAL;
	}

	if (!mutex_trylock(&list->mtx)) {
		printk(KERN_ERR "Link List in use\n");
		return -EINVAL;
	}

	/*
	 * Empty out all of the entries from the DMA list. We need to go to the
	 * low level driver as DMA entries are driver specific.
	 */
	retval = bridge->dma_list_empty(list);
	if (retval) {
		printk(KERN_ERR "Unable to empty link-list entries\n");
		mutex_unlock(&list->mtx);
		return retval;
	}
	mutex_unlock(&list->mtx);
	kfree(list);

	return retval;
}
EXPORT_SYMBOL(vme_dma_list_free);

/**
 * vme_dma_free - Free a VME DMA resource.
 * @resource: Pointer to VME DMA resource.
 *
 * Free the provided DMA resource so that it may be reallocated.
 *
 * Return: Zero on success, -EINVAL on invalid VME resource, -EBUSY if resource
 *         is still active.
 */
int vme_dma_free(struct vme_resource *resource)
{
	struct vme_dma_resource *ctrlr;

	if (resource->type != VME_DMA) {
		printk(KERN_ERR "Not a DMA resource\n");
		return -EINVAL;
	}

	ctrlr = list_entry(resource->entry, struct vme_dma_resource, list);

	if (!mutex_trylock(&ctrlr->mtx)) {
		printk(KERN_ERR "Resource busy, can't free\n");
		return -EBUSY;
	}

	if (!(list_empty(&ctrlr->pending) && list_empty(&ctrlr->running))) {
		printk(KERN_WARNING "Resource still processing transfers\n");
		mutex_unlock(&ctrlr->mtx);
		return -EBUSY;
	}

	ctrlr->locked = 0;

	mutex_unlock(&ctrlr->mtx);

	kfree(resource);

	return 0;
}
EXPORT_SYMBOL(vme_dma_free);

void vme_bus_error_handler(struct vme_bridge *bridge,
			   unsigned long long address, int am)
{
	struct list_head *handler_pos = NULL;
	struct vme_error_handler *handler;
	int handler_triggered = 0;
	u32 aspace = vme_get_aspace(am);

	list_for_each(handler_pos, &bridge->vme_error_handlers) {
		handler = list_entry(handler_pos, struct vme_error_handler,
				     list);
		if ((aspace == handler->aspace) &&
		    (address >= handler->start) &&
		    (address < handler->end)) {
			if (!handler->num_errors)
				handler->first_error = address;
			if (handler->num_errors != UINT_MAX)
				handler->num_errors++;
			handler_triggered = 1;
		}
	}

	if (!handler_triggered)
		dev_err(bridge->parent,
			"Unhandled VME access error at address 0x%llx\n",
			address);
}
EXPORT_SYMBOL(vme_bus_error_handler);

struct vme_error_handler *vme_register_error_handler(
	struct vme_bridge *bridge, u32 aspace,
	unsigned long long address, size_t len)
{
	struct vme_error_handler *handler;

	handler = kmalloc(sizeof(*handler), GFP_KERNEL);
	if (!handler)
		return NULL;

	handler->aspace = aspace;
	handler->start = address;
	handler->end = address + len;
	handler->num_errors = 0;
	handler->first_error = 0;
	list_add_tail(&handler->list, &bridge->vme_error_handlers);

	return handler;
}
EXPORT_SYMBOL(vme_register_error_handler);

void vme_unregister_error_handler(struct vme_error_handler *handler)
{
	list_del(&handler->list);
	kfree(handler);
}
EXPORT_SYMBOL(vme_unregister_error_handler);

void vme_irq_handler(struct vme_bridge *bridge, int level, int statid)
{
	void (*call)(int, int, void *);
	void *priv_data;

	call = bridge->irq[level - 1].callback[statid].func;
	priv_data = bridge->irq[level - 1].callback[statid].priv_data;

	if (call != NULL)
		call(level, statid, priv_data);
	else
		printk(KERN_WARNING "Spurious VME interrupt, level:%x, vector:%x\n",
		       level, statid);
}
EXPORT_SYMBOL(vme_irq_handler);

/**
 * vme_irq_request - Request a specific VME interrupt.
 * @vdev: Pointer to VME device struct vme_dev assigned to driver instance.
 * @level: Interrupt priority being requested.
 * @statid: Interrupt vector being requested.
 * @callback: Pointer to callback function called when VME interrupt/vector
 *            received.
 * @priv_data: Generic pointer that will be passed to the callback function.
 *
 * Request callback to be attached as a handler for VME interrupts with provided
 * level and statid.
 *
 * Return: Zero on success, -EINVAL on invalid vme device, level or if the
 *         function is not supported, -EBUSY if the level/statid combination is
 *         already in use. Hardware specific errors also possible.
 */
int vme_irq_request(struct vme_dev *vdev, int level, int statid,
	void (*callback)(int, int, void *),
	void *priv_data)
{
	struct vme_bridge *bridge;

	bridge = vdev->bridge;
	if (bridge == NULL) {
		printk(KERN_ERR "Can't find VME bus\n");
		return -EINVAL;
	}

	if ((level < 1) || (level > 7)) {
		printk(KERN_ERR "Invalid interrupt level\n");
		return -EINVAL;
	}

	if (bridge->irq_set == NULL) {
		printk(KERN_ERR "Configuring interrupts not supported\n");
		return -EINVAL;
	}

	mutex_lock(&bridge->irq_mtx);

	if (bridge->irq[level - 1].callback[statid].func) {
		mutex_unlock(&bridge->irq_mtx);
		printk(KERN_WARNING "VME Interrupt already taken\n");
		return -EBUSY;
	}

	bridge->irq[level - 1].count++;
	bridge->irq[level - 1].callback[statid].priv_data = priv_data;
	bridge->irq[level - 1].callback[statid].func = callback;

	/* Enable IRQ level */
	bridge->irq_set(bridge, level, 1, 1);

	mutex_unlock(&bridge->irq_mtx);

	return 0;
}
EXPORT_SYMBOL(vme_irq_request);

/**
 * vme_irq_free - Free a VME interrupt.
 * @vdev: Pointer to VME device struct vme_dev assigned to driver instance.
 * @level: Interrupt priority of interrupt being freed.
 * @statid: Interrupt vector of interrupt being freed.
 *
 * Remove previously attached callback from VME interrupt priority/vector.
 */
void vme_irq_free(struct vme_dev *vdev, int level, int statid)
{
	struct vme_bridge *bridge;

	bridge = vdev->bridge;
	if (bridge == NULL) {
		printk(KERN_ERR "Can't find VME bus\n");
		return;
	}

	if ((level < 1) || (level > 7)) {
		printk(KERN_ERR "Invalid interrupt level\n");
		return;
	}

	if (bridge->irq_set == NULL) {
		printk(KERN_ERR "Configuring interrupts not supported\n");
		return;
	}

	mutex_lock(&bridge->irq_mtx);

	bridge->irq[level - 1].count--;

	/* Disable IRQ level if no more interrupts attached at this level*/
	if (bridge->irq[level - 1].count == 0)
		bridge->irq_set(bridge, level, 0, 1);

	bridge->irq[level - 1].callback[statid].func = NULL;
	bridge->irq[level - 1].callback[statid].priv_data = NULL;

	mutex_unlock(&bridge->irq_mtx);
}
EXPORT_SYMBOL(vme_irq_free);

/**
 * vme_irq_generate - Generate VME interrupt.
 * @vdev: Pointer to VME device struct vme_dev assigned to driver instance.
 * @level: Interrupt priority at which to assert the interrupt.
 * @statid: Interrupt vector to associate with the interrupt.
 *
 * Generate a VME interrupt of the provided level and with the provided
 * statid.
 *
 * Return: Zero on success, -EINVAL on invalid vme device, level or if the
 *         function is not supported. Hardware specific errors also possible.
 */
int vme_irq_generate(struct vme_dev *vdev, int level, int statid)
{
	struct vme_bridge *bridge;

	bridge = vdev->bridge;
	if (bridge == NULL) {
		printk(KERN_ERR "Can't find VME bus\n");
		return -EINVAL;
	}

	if ((level < 1) || (level > 7)) {
		printk(KERN_WARNING "Invalid interrupt level\n");
		return -EINVAL;
	}

	if (bridge->irq_generate == NULL) {
		printk(KERN_WARNING "Interrupt generation not supported\n");
		return -EINVAL;
	}

	return bridge->irq_generate(bridge, level, statid);
}
EXPORT_SYMBOL(vme_irq_generate);

/**
 * vme_lm_request - Request a VME location monitor
 * @vdev: Pointer to VME device struct vme_dev assigned to driver instance.
 *
 * Allocate a location monitor resource to the driver. A location monitor
 * allows the driver to monitor accesses to a contiguous number of
 * addresses on the VME bus.
 *
 * Return: Pointer to a VME resource on success or NULL on failure.
 */
struct vme_resource *vme_lm_request(struct vme_dev *vdev)
{
	struct vme_bridge *bridge;
	struct list_head *lm_pos = NULL;
	struct vme_lm_resource *allocated_lm = NULL;
	struct vme_lm_resource *lm = NULL;
	struct vme_resource *resource = NULL;

	bridge = vdev->bridge;
	if (bridge == NULL) {
		printk(KERN_ERR "Can't find VME bus\n");
		goto err_bus;
	}

	/* Loop through LM resources */
	list_for_each(lm_pos, &bridge->lm_resources) {
		lm = list_entry(lm_pos,
			struct vme_lm_resource, list);

		if (lm == NULL) {
			printk(KERN_ERR "Registered NULL Location Monitor resource\n");
			continue;
		}

		/* Find an unlocked controller */
		mutex_lock(&lm->mtx);
		if (lm->locked == 0) {
			lm->locked = 1;
			mutex_unlock(&lm->mtx);
			allocated_lm = lm;
			break;
		}
		mutex_unlock(&lm->mtx);
	}

	/* Check to see if we found a resource */
	if (allocated_lm == NULL)
		goto err_lm;

	resource = kmalloc(sizeof(struct vme_resource), GFP_KERNEL);
	if (!resource)
		goto err_alloc;

	resource->type = VME_LM;
	resource->entry = &allocated_lm->list;

	return resource;

err_alloc:
	/* Unlock image */
	mutex_lock(&lm->mtx);
	lm->locked = 0;
	mutex_unlock(&lm->mtx);
err_lm:
err_bus:
	return NULL;
}
EXPORT_SYMBOL(vme_lm_request);

/**
 * vme_lm_count - Determine number of VME Addresses monitored
 * @resource: Pointer to VME location monitor resource.
 *
 * The number of contiguous addresses monitored is hardware dependent.
 * Return the number of contiguous addresses monitored by the
 * location monitor.
 *
 * Return: Count of addresses monitored or -EINVAL when provided with an
 *	   invalid location monitor resource.
 */
int vme_lm_count(struct vme_resource *resource)
{
	struct vme_lm_resource *lm;

	if (resource->type != VME_LM) {
		printk(KERN_ERR "Not a Location Monitor resource\n");
		return -EINVAL;
	}

	lm = list_entry(resource->entry, struct vme_lm_resource, list);

	return lm->monitors;
}
EXPORT_SYMBOL(vme_lm_count);

/**
 * vme_lm_set - Configure location monitor
 * @resource: Pointer to VME location monitor resource.
 * @lm_base: Base address to monitor.
 * @aspace: VME address space to monitor.
 * @cycle: VME bus cycle type to monitor.
 *
 * Set the base address, address space and cycle type of accesses to be
 * monitored by the location monitor.
 *
 * Return: Zero on success, -EINVAL when provided with an invalid location
 *	   monitor resource or function is not supported. Hardware specific
 *	   errors may also be returned.
 */
int vme_lm_set(struct vme_resource *resource, unsigned long long lm_base,
	u32 aspace, u32 cycle)
{
	struct vme_bridge *bridge = find_bridge(resource);
	struct vme_lm_resource *lm;

	if (resource->type != VME_LM) {
		printk(KERN_ERR "Not a Location Monitor resource\n");
		return -EINVAL;
	}

	lm = list_entry(resource->entry, struct vme_lm_resource, list);

	if (bridge->lm_set == NULL) {
		printk(KERN_ERR "vme_lm_set not supported\n");
		return -EINVAL;
	}

	return bridge->lm_set(lm, lm_base, aspace, cycle);
}
EXPORT_SYMBOL(vme_lm_set);

/**
 * vme_lm_get - Retrieve location monitor settings
 * @resource: Pointer to VME location monitor resource.
 * @lm_base: Pointer used to output the base address monitored.
 * @aspace: Pointer used to output the address space monitored.
 * @cycle: Pointer used to output the VME bus cycle type monitored.
 *
 * Retrieve the base address, address space and cycle type of accesses to
 * be monitored by the location monitor.
 *
 * Return: Zero on success, -EINVAL when provided with an invalid location
 *	   monitor resource or function is not supported. Hardware specific
 *	   errors may also be returned.
 */
int vme_lm_get(struct vme_resource *resource, unsigned long long *lm_base,
	u32 *aspace, u32 *cycle)
{
	struct vme_bridge *bridge = find_bridge(resource);
	struct vme_lm_resource *lm;

	if (resource->type != VME_LM) {
		printk(KERN_ERR "Not a Location Monitor resource\n");
		return -EINVAL;
	}

	lm = list_entry(resource->entry, struct vme_lm_resource, list);

	if (bridge->lm_get == NULL) {
		printk(KERN_ERR "vme_lm_get not supported\n");
		return -EINVAL;
	}

	return bridge->lm_get(lm, lm_base, aspace, cycle);
}
EXPORT_SYMBOL(vme_lm_get);

/**
 * vme_lm_attach - Provide callback for location monitor address
 * @resource: Pointer to VME location monitor resource.
 * @monitor: Offset to which callback should be attached.
 * @callback: Pointer to callback function called when triggered.
 * @data: Generic pointer that will be passed to the callback function.
 *
 * Attach a callback to the specificed offset into the location monitors
 * monitored addresses. A generic pointer is provided to allow data to be
 * passed to the callback when called.
 *
 * Return: Zero on success, -EINVAL when provided with an invalid location
 *	   monitor resource or function is not supported. Hardware specific
 *	   errors may also be returned.
 */
int vme_lm_attach(struct vme_resource *resource, int monitor,
	void (*callback)(void *), void *data)
{
	struct vme_bridge *bridge = find_bridge(resource);
	struct vme_lm_resource *lm;

	if (resource->type != VME_LM) {
		printk(KERN_ERR "Not a Location Monitor resource\n");
		return -EINVAL;
	}

	lm = list_entry(resource->entry, struct vme_lm_resource, list);

	if (bridge->lm_attach == NULL) {
		printk(KERN_ERR "vme_lm_attach not supported\n");
		return -EINVAL;
	}

	return bridge->lm_attach(lm, monitor, callback, data);
}
EXPORT_SYMBOL(vme_lm_attach);

/**
 * vme_lm_detach - Remove callback for location monitor address
 * @resource: Pointer to VME location monitor resource.
 * @monitor: Offset to which callback should be removed.
 *
 * Remove the callback associated with the specificed offset into the
 * location monitors monitored addresses.
 *
 * Return: Zero on success, -EINVAL when provided with an invalid location
 *	   monitor resource or function is not supported. Hardware specific
 *	   errors may also be returned.
 */
int vme_lm_detach(struct vme_resource *resource, int monitor)
{
	struct vme_bridge *bridge = find_bridge(resource);
	struct vme_lm_resource *lm;

	if (resource->type != VME_LM) {
		printk(KERN_ERR "Not a Location Monitor resource\n");
		return -EINVAL;
	}

	lm = list_entry(resource->entry, struct vme_lm_resource, list);

	if (bridge->lm_detach == NULL) {
		printk(KERN_ERR "vme_lm_detach not supported\n");
		return -EINVAL;
	}

	return bridge->lm_detach(lm, monitor);
}
EXPORT_SYMBOL(vme_lm_detach);

/**
 * vme_lm_free - Free allocated VME location monitor
 * @resource: Pointer to VME location monitor resource.
 *
 * Free allocation of a VME location monitor.
 *
 * WARNING: This function currently expects that any callbacks that have
 *          been attached to the location monitor have been removed.
 *
 * Return: Zero on success, -EINVAL when provided with an invalid location
 *	   monitor resource.
 */
void vme_lm_free(struct vme_resource *resource)
{
	struct vme_lm_resource *lm;

	if (resource->type != VME_LM) {
		printk(KERN_ERR "Not a Location Monitor resource\n");
		return;
	}

	lm = list_entry(resource->entry, struct vme_lm_resource, list);

	mutex_lock(&lm->mtx);

	/* XXX
	 * Check to see that there aren't any callbacks still attached, if
	 * there are we should probably be detaching them!
	 */

	lm->locked = 0;

	mutex_unlock(&lm->mtx);

	kfree(resource);
}
EXPORT_SYMBOL(vme_lm_free);

/**
 * vme_slot_num - Retrieve slot ID
 * @vdev: Pointer to VME device struct vme_dev assigned to driver instance.
 *
 * Retrieve the slot ID associated with the provided VME device.
 *
 * Return: The slot ID on success, -EINVAL if VME bridge cannot be determined
 *         or the function is not supported. Hardware specific errors may also
 *         be returned.
 */
int vme_slot_num(struct vme_dev *vdev)
{
	struct vme_bridge *bridge;

	bridge = vdev->bridge;
	if (bridge == NULL) {
		printk(KERN_ERR "Can't find VME bus\n");
		return -EINVAL;
	}

	if (bridge->slot_get == NULL) {
		printk(KERN_WARNING "vme_slot_num not supported\n");
		return -EINVAL;
	}

	return bridge->slot_get(bridge);
}
EXPORT_SYMBOL(vme_slot_num);

/**
 * vme_bus_num - Retrieve bus number
 * @vdev: Pointer to VME device struct vme_dev assigned to driver instance.
 *
 * Retrieve the bus enumeration associated with the provided VME device.
 *
 * Return: The bus number on success, -EINVAL if VME bridge cannot be
 *         determined.
 */
int vme_bus_num(struct vme_dev *vdev)
{
	struct vme_bridge *bridge;

	bridge = vdev->bridge;
	if (bridge == NULL) {
		pr_err("Can't find VME bus\n");
		return -EINVAL;
	}

	return bridge->num;
}
EXPORT_SYMBOL(vme_bus_num);

/* - Bridge Registration --------------------------------------------------- */

static void vme_dev_release(struct device *dev)
{
	kfree(dev_to_vme_dev(dev));
}

/* Common bridge initialization */
struct vme_bridge *vme_init_bridge(struct vme_bridge *bridge)
{
	INIT_LIST_HEAD(&bridge->vme_error_handlers);
	INIT_LIST_HEAD(&bridge->master_resources);
	INIT_LIST_HEAD(&bridge->slave_resources);
	INIT_LIST_HEAD(&bridge->dma_resources);
	INIT_LIST_HEAD(&bridge->lm_resources);
	mutex_init(&bridge->irq_mtx);

	return bridge;
}
EXPORT_SYMBOL(vme_init_bridge);

int vme_register_bridge(struct vme_bridge *bridge)
{
	int i;
	int ret = -1;

	mutex_lock(&vme_buses_lock);
	for (i = 0; i < sizeof(vme_bus_numbers) * 8; i++) {
		if ((vme_bus_numbers & (1 << i)) == 0) {
			vme_bus_numbers |= (1 << i);
			bridge->num = i;
			INIT_LIST_HEAD(&bridge->devices);
			list_add_tail(&bridge->bus_list, &vme_bus_list);
			ret = 0;
			break;
		}
	}
	mutex_unlock(&vme_buses_lock);

	return ret;
}
EXPORT_SYMBOL(vme_register_bridge);

void vme_unregister_bridge(struct vme_bridge *bridge)
{
	struct vme_dev *vdev;
	struct vme_dev *tmp;

	mutex_lock(&vme_buses_lock);
	vme_bus_numbers &= ~(1 << bridge->num);
	list_for_each_entry_safe(vdev, tmp, &bridge->devices, bridge_list) {
		list_del(&vdev->drv_list);
		list_del(&vdev->bridge_list);
		device_unregister(&vdev->dev);
	}
	list_del(&bridge->bus_list);
	mutex_unlock(&vme_buses_lock);
}
EXPORT_SYMBOL(vme_unregister_bridge);

/* - Driver Registration --------------------------------------------------- */

static int __vme_register_driver_bus(struct vme_driver *drv,
	struct vme_bridge *bridge, unsigned int ndevs)
{
	int err;
	unsigned int i;
	struct vme_dev *vdev;
	struct vme_dev *tmp;

	for (i = 0; i < ndevs; i++) {
		vdev = kzalloc(sizeof(struct vme_dev), GFP_KERNEL);
		if (!vdev) {
			err = -ENOMEM;
			goto err_devalloc;
		}
		vdev->num = i;
		vdev->bridge = bridge;
		vdev->dev.platform_data = drv;
		vdev->dev.release = vme_dev_release;
		vdev->dev.parent = bridge->parent;
		vdev->dev.bus = &vme_bus_type;
		dev_set_name(&vdev->dev, "%s.%u-%u", drv->name, bridge->num,
			vdev->num);

		err = device_register(&vdev->dev);
		if (err)
			goto err_reg;

		if (vdev->dev.platform_data) {
			list_add_tail(&vdev->drv_list, &drv->devices);
			list_add_tail(&vdev->bridge_list, &bridge->devices);
		} else
			device_unregister(&vdev->dev);
	}
	return 0;

err_reg:
	put_device(&vdev->dev);
	kfree(vdev);
err_devalloc:
	list_for_each_entry_safe(vdev, tmp, &drv->devices, drv_list) {
		list_del(&vdev->drv_list);
		list_del(&vdev->bridge_list);
		device_unregister(&vdev->dev);
	}
	return err;
}

static int __vme_register_driver(struct vme_driver *drv, unsigned int ndevs)
{
	struct vme_bridge *bridge;
	int err = 0;

	mutex_lock(&vme_buses_lock);
	list_for_each_entry(bridge, &vme_bus_list, bus_list) {
		/*
		 * This cannot cause trouble as we already have vme_buses_lock
		 * and if the bridge is removed, it will have to go through
		 * vme_unregister_bridge() to do it (which calls remove() on
		 * the bridge which in turn tries to acquire vme_buses_lock and
		 * will have to wait).
		 */
		err = __vme_register_driver_bus(drv, bridge, ndevs);
		if (err)
			break;
	}
	mutex_unlock(&vme_buses_lock);
	return err;
}

/**
 * vme_register_driver - Register a VME driver
 * @drv: Pointer to VME driver structure to register.
 * @ndevs: Maximum number of devices to allow to be enumerated.
 *
 * Register a VME device driver with the VME subsystem.
 *
 * Return: Zero on success, error value on registration failure.
 */
int vme_register_driver(struct vme_driver *drv, unsigned int ndevs)
{
	int err;

	drv->driver.name = drv->name;
	drv->driver.bus = &vme_bus_type;
	INIT_LIST_HEAD(&drv->devices);

	err = driver_register(&drv->driver);
	if (err)
		return err;

	err = __vme_register_driver(drv, ndevs);
	if (err)
		driver_unregister(&drv->driver);

	return err;
}
EXPORT_SYMBOL(vme_register_driver);

/**
 * vme_unregister_driver - Unregister a VME driver
 * @drv: Pointer to VME driver structure to unregister.
 *
 * Unregister a VME device driver from the VME subsystem.
 */
void vme_unregister_driver(struct vme_driver *drv)
{
	struct vme_dev *dev, *dev_tmp;

	mutex_lock(&vme_buses_lock);
	list_for_each_entry_safe(dev, dev_tmp, &drv->devices, drv_list) {
		list_del(&dev->drv_list);
		list_del(&dev->bridge_list);
		device_unregister(&dev->dev);
	}
	mutex_unlock(&vme_buses_lock);

	driver_unregister(&drv->driver);
}
EXPORT_SYMBOL(vme_unregister_driver);

/* - Bus Registration ------------------------------------------------------ */

static int vme_bus_match(struct device *dev, struct device_driver *drv)
{
	struct vme_driver *vme_drv;

	vme_drv = container_of(drv, struct vme_driver, driver);

	if (dev->platform_data == vme_drv) {
		struct vme_dev *vdev = dev_to_vme_dev(dev);

		if (vme_drv->match && vme_drv->match(vdev))
			return 1;

		dev->platform_data = NULL;
	}
	return 0;
}

static int vme_bus_probe(struct device *dev)
{
	int retval = -ENODEV;
	struct vme_driver *driver;
	struct vme_dev *vdev = dev_to_vme_dev(dev);

	driver = dev->platform_data;

	if (driver->probe != NULL)
		retval = driver->probe(vdev);

	return retval;
}

static int vme_bus_remove(struct device *dev)
{
	int retval = -ENODEV;
	struct vme_driver *driver;
	struct vme_dev *vdev = dev_to_vme_dev(dev);

	driver = dev->platform_data;

	if (driver->remove != NULL)
		retval = driver->remove(vdev);

	return retval;
}

struct bus_type vme_bus_type = {
	.name = "vme",
	.match = vme_bus_match,
	.probe = vme_bus_probe,
	.remove = vme_bus_remove,
};
EXPORT_SYMBOL(vme_bus_type);

static int __init vme_init(void)
{
	return bus_register(&vme_bus_type);
}
subsys_initcall(vme_init);