summaryrefslogtreecommitdiffstats
path: root/drivers/parisc/ccio-dma.c
blob: acba1f56af3e439647f6c3884a37ab78b233e1b3 (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
/*
** ccio-dma.c:
**	DMA management routines for first generation cache-coherent machines.
**	Program U2/Uturn in "Virtual Mode" and use the I/O MMU.
**
**	(c) Copyright 2000 Grant Grundler
**	(c) Copyright 2000 Ryan Bradetich
**	(c) Copyright 2000 Hewlett-Packard Company
**
** 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.
**
**
**  "Real Mode" operation refers to U2/Uturn chip operation.
**  U2/Uturn were designed to perform coherency checks w/o using
**  the I/O MMU - basically what x86 does.
**
**  Philipp Rumpf has a "Real Mode" driver for PCX-W machines at:
**      CVSROOT=:pserver:anonymous@198.186.203.37:/cvsroot/linux-parisc
**      cvs -z3 co linux/arch/parisc/kernel/dma-rm.c
**
**  I've rewritten his code to work under TPG's tree. See ccio-rm-dma.c.
**
**  Drawbacks of using Real Mode are:
**	o outbound DMA is slower - U2 won't prefetch data (GSC+ XQL signal).
**      o Inbound DMA less efficient - U2 can't use DMA_FAST attribute.
**	o Ability to do scatter/gather in HW is lost.
**	o Doesn't work under PCX-U/U+ machines since they didn't follow
**        the coherency design originally worked out. Only PCX-W does.
*/

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/pci.h>
#include <linux/reboot.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/scatterlist.h>
#include <linux/iommu-helper.h>
#include <linux/export.h>

#include <asm/byteorder.h>
#include <asm/cache.h>		/* for L1_CACHE_BYTES */
#include <linux/uaccess.h>
#include <asm/page.h>
#include <asm/dma.h>
#include <asm/io.h>
#include <asm/hardware.h>       /* for register_module() */
#include <asm/parisc-device.h>

/* 
** Choose "ccio" since that's what HP-UX calls it.
** Make it easier for folks to migrate from one to the other :^)
*/
#define MODULE_NAME "ccio"

#undef DEBUG_CCIO_RES
#undef DEBUG_CCIO_RUN
#undef DEBUG_CCIO_INIT
#undef DEBUG_CCIO_RUN_SG

#ifdef CONFIG_PROC_FS
/* depends on proc fs support. But costs CPU performance. */
#undef CCIO_COLLECT_STATS
#endif

#include <asm/runway.h>		/* for proc_runway_root */

#ifdef DEBUG_CCIO_INIT
#define DBG_INIT(x...)  printk(x)
#else
#define DBG_INIT(x...)
#endif

#ifdef DEBUG_CCIO_RUN
#define DBG_RUN(x...)   printk(x)
#else
#define DBG_RUN(x...)
#endif

#ifdef DEBUG_CCIO_RES
#define DBG_RES(x...)   printk(x)
#else
#define DBG_RES(x...)
#endif

#ifdef DEBUG_CCIO_RUN_SG
#define DBG_RUN_SG(x...) printk(x)
#else
#define DBG_RUN_SG(x...)
#endif

#define CCIO_INLINE	inline
#define WRITE_U32(value, addr) __raw_writel(value, addr)
#define READ_U32(addr) __raw_readl(addr)

#define U2_IOA_RUNWAY 0x580
#define U2_BC_GSC     0x501
#define UTURN_IOA_RUNWAY 0x581
#define UTURN_BC_GSC     0x502

#define IOA_NORMAL_MODE      0x00020080 /* IO_CONTROL to turn on CCIO        */
#define CMD_TLB_DIRECT_WRITE 35         /* IO_COMMAND for I/O TLB Writes     */
#define CMD_TLB_PURGE        33         /* IO_COMMAND to Purge I/O TLB entry */

#define CCIO_MAPPING_ERROR    (~(dma_addr_t)0)

struct ioa_registers {
        /* Runway Supervisory Set */
        int32_t    unused1[12];
        uint32_t   io_command;             /* Offset 12 */
        uint32_t   io_status;              /* Offset 13 */
        uint32_t   io_control;             /* Offset 14 */
        int32_t    unused2[1];

        /* Runway Auxiliary Register Set */
        uint32_t   io_err_resp;            /* Offset  0 */
        uint32_t   io_err_info;            /* Offset  1 */
        uint32_t   io_err_req;             /* Offset  2 */
        uint32_t   io_err_resp_hi;         /* Offset  3 */
        uint32_t   io_tlb_entry_m;         /* Offset  4 */
        uint32_t   io_tlb_entry_l;         /* Offset  5 */
        uint32_t   unused3[1];
        uint32_t   io_pdir_base;           /* Offset  7 */
        uint32_t   io_io_low_hv;           /* Offset  8 */
        uint32_t   io_io_high_hv;          /* Offset  9 */
        uint32_t   unused4[1];
        uint32_t   io_chain_id_mask;       /* Offset 11 */
        uint32_t   unused5[2];
        uint32_t   io_io_low;              /* Offset 14 */
        uint32_t   io_io_high;             /* Offset 15 */
};

/*
** IOA Registers
** -------------
**
** Runway IO_CONTROL Register (+0x38)
** 
** The Runway IO_CONTROL register controls the forwarding of transactions.
**
** | 0  ...  13  |  14 15 | 16 ... 21 | 22 | 23 24 |  25 ... 31 |
** |    HV       |   TLB  |  reserved | HV | mode  |  reserved  |
**
** o mode field indicates the address translation of transactions
**   forwarded from Runway to GSC+:
**       Mode Name     Value        Definition
**       Off (default)   0          Opaque to matching addresses.
**       Include         1          Transparent for matching addresses.
**       Peek            3          Map matching addresses.
**
**       + "Off" mode: Runway transactions which match the I/O range
**         specified by the IO_IO_LOW/IO_IO_HIGH registers will be ignored.
**       + "Include" mode: all addresses within the I/O range specified
**         by the IO_IO_LOW and IO_IO_HIGH registers are transparently
**         forwarded. This is the I/O Adapter's normal operating mode.
**       + "Peek" mode: used during system configuration to initialize the
**         GSC+ bus. Runway Write_Shorts in the address range specified by
**         IO_IO_LOW and IO_IO_HIGH are forwarded through the I/O Adapter
**         *AND* the GSC+ address is remapped to the Broadcast Physical
**         Address space by setting the 14 high order address bits of the
**         32 bit GSC+ address to ones.
**
** o TLB field affects transactions which are forwarded from GSC+ to Runway.
**   "Real" mode is the poweron default.
** 
**   TLB Mode  Value  Description
**   Real        0    No TLB translation. Address is directly mapped and the
**                    virtual address is composed of selected physical bits.
**   Error       1    Software fills the TLB manually.
**   Normal      2    IOA fetches IO TLB misses from IO PDIR (in host memory).
**
**
** IO_IO_LOW_HV	  +0x60 (HV dependent)
** IO_IO_HIGH_HV  +0x64 (HV dependent)
** IO_IO_LOW      +0x78	(Architected register)
** IO_IO_HIGH     +0x7c	(Architected register)
**
** IO_IO_LOW and IO_IO_HIGH set the lower and upper bounds of the
** I/O Adapter address space, respectively.
**
** 0  ... 7 | 8 ... 15 |  16   ...   31 |
** 11111111 | 11111111 |      address   |
**
** Each LOW/HIGH pair describes a disjoint address space region.
** (2 per GSC+ port). Each incoming Runway transaction address is compared
** with both sets of LOW/HIGH registers. If the address is in the range
** greater than or equal to IO_IO_LOW and less than IO_IO_HIGH the transaction
** for forwarded to the respective GSC+ bus.
** Specify IO_IO_LOW equal to or greater than IO_IO_HIGH to avoid specifying
** an address space region.
**
** In order for a Runway address to reside within GSC+ extended address space:
**	Runway Address [0:7]    must identically compare to 8'b11111111
**	Runway Address [8:11]   must be equal to IO_IO_LOW(_HV)[16:19]
** 	Runway Address [12:23]  must be greater than or equal to
**	           IO_IO_LOW(_HV)[20:31] and less than IO_IO_HIGH(_HV)[20:31].
**	Runway Address [24:39]  is not used in the comparison.
**
** When the Runway transaction is forwarded to GSC+, the GSC+ address is
** as follows:
**	GSC+ Address[0:3]	4'b1111
**	GSC+ Address[4:29]	Runway Address[12:37]
**	GSC+ Address[30:31]	2'b00
**
** All 4 Low/High registers must be initialized (by PDC) once the lower bus
** is interrogated and address space is defined. The operating system will
** modify the architectural IO_IO_LOW and IO_IO_HIGH registers following
** the PDC initialization.  However, the hardware version dependent IO_IO_LOW
** and IO_IO_HIGH registers should not be subsequently altered by the OS.
** 
** Writes to both sets of registers will take effect immediately, bypassing
** the queues, which ensures that subsequent Runway transactions are checked
** against the updated bounds values. However reads are queued, introducing
** the possibility of a read being bypassed by a subsequent write to the same
** register. This sequence can be avoided by having software wait for read
** returns before issuing subsequent writes.
*/

struct ioc {
	struct ioa_registers __iomem *ioc_regs;  /* I/O MMU base address */
	u8  *res_map;	                /* resource map, bit == pdir entry */
	u64 *pdir_base;	                /* physical base address */
	u32 pdir_size; 			/* bytes, function of IOV Space size */
	u32 res_hint;	                /* next available IOVP - 
					   circular search */
	u32 res_size;		    	/* size of resource map in bytes */
	spinlock_t res_lock;

#ifdef CCIO_COLLECT_STATS
#define CCIO_SEARCH_SAMPLE 0x100
	unsigned long avg_search[CCIO_SEARCH_SAMPLE];
	unsigned long avg_idx;		  /* current index into avg_search */
	unsigned long used_pages;
	unsigned long msingle_calls;
	unsigned long msingle_pages;
	unsigned long msg_calls;
	unsigned long msg_pages;
	unsigned long usingle_calls;
	unsigned long usingle_pages;
	unsigned long usg_calls;
	unsigned long usg_pages;
#endif
	unsigned short cujo20_bug;

	/* STUFF We don't need in performance path */
	u32 chainid_shift; 		/* specify bit location of chain_id */
	struct ioc *next;		/* Linked list of discovered iocs */
	const char *name;		/* device name from firmware */
	unsigned int hw_path;           /* the hardware path this ioc is associatd with */
	struct pci_dev *fake_pci_dev;   /* the fake pci_dev for non-pci devs */
	struct resource mmio_region[2]; /* The "routed" MMIO regions */
};

static struct ioc *ioc_list;
static int ioc_count;

/**************************************************************
*
*   I/O Pdir Resource Management
*
*   Bits set in the resource map are in use.
*   Each bit can represent a number of pages.
*   LSbs represent lower addresses (IOVA's).
*
*   This was was copied from sba_iommu.c. Don't try to unify
*   the two resource managers unless a way to have different
*   allocation policies is also adjusted. We'd like to avoid
*   I/O TLB thrashing by having resource allocation policy
*   match the I/O TLB replacement policy.
*
***************************************************************/
#define IOVP_SIZE PAGE_SIZE
#define IOVP_SHIFT PAGE_SHIFT
#define IOVP_MASK PAGE_MASK

/* Convert from IOVP to IOVA and vice versa. */
#define CCIO_IOVA(iovp,offset) ((iovp) | (offset))
#define CCIO_IOVP(iova) ((iova) & IOVP_MASK)

#define PDIR_INDEX(iovp)    ((iovp)>>IOVP_SHIFT)
#define MKIOVP(pdir_idx)    ((long)(pdir_idx) << IOVP_SHIFT)
#define MKIOVA(iovp,offset) (dma_addr_t)((long)iovp | (long)offset)

/*
** Don't worry about the 150% average search length on a miss.
** If the search wraps around, and passes the res_hint, it will
** cause the kernel to panic anyhow.
*/
#define CCIO_SEARCH_LOOP(ioc, res_idx, mask, size)  \
       for(; res_ptr < res_end; ++res_ptr) { \
		int ret;\
		unsigned int idx;\
		idx = (unsigned int)((unsigned long)res_ptr - (unsigned long)ioc->res_map); \
		ret = iommu_is_span_boundary(idx << 3, pages_needed, 0, boundary_size);\
		if ((0 == (*res_ptr & mask)) && !ret) { \
			*res_ptr |= mask; \
			res_idx = idx;\
			ioc->res_hint = res_idx + (size >> 3); \
			goto resource_found; \
		} \
	}

#define CCIO_FIND_FREE_MAPPING(ioa, res_idx, mask, size) \
       u##size *res_ptr = (u##size *)&((ioc)->res_map[ioa->res_hint & ~((size >> 3) - 1)]); \
       u##size *res_end = (u##size *)&(ioc)->res_map[ioa->res_size]; \
       CCIO_SEARCH_LOOP(ioc, res_idx, mask, size); \
       res_ptr = (u##size *)&(ioc)->res_map[0]; \
       CCIO_SEARCH_LOOP(ioa, res_idx, mask, size);

/*
** Find available bit in this ioa's resource map.
** Use a "circular" search:
**   o Most IOVA's are "temporary" - avg search time should be small.
** o keep a history of what happened for debugging
** o KISS.
**
** Perf optimizations:
** o search for log2(size) bits at a time.
** o search for available resource bits using byte/word/whatever.
** o use different search for "large" (eg > 4 pages) or "very large"
**   (eg > 16 pages) mappings.
*/

/**
 * ccio_alloc_range - Allocate pages in the ioc's resource map.
 * @ioc: The I/O Controller.
 * @pages_needed: The requested number of pages to be mapped into the
 * I/O Pdir...
 *
 * This function searches the resource map of the ioc to locate a range
 * of available pages for the requested size.
 */
static int
ccio_alloc_range(struct ioc *ioc, struct device *dev, size_t size)
{
	unsigned int pages_needed = size >> IOVP_SHIFT;
	unsigned int res_idx;
	unsigned long boundary_size;
#ifdef CCIO_COLLECT_STATS
	unsigned long cr_start = mfctl(16);
#endif
	
	BUG_ON(pages_needed == 0);
	BUG_ON((pages_needed * IOVP_SIZE) > DMA_CHUNK_SIZE);
     
	DBG_RES("%s() size: %d pages_needed %d\n", 
		__func__, size, pages_needed);

	/*
	** "seek and ye shall find"...praying never hurts either...
	** ggg sacrifices another 710 to the computer gods.
	*/

	boundary_size = ALIGN((unsigned long long)dma_get_seg_boundary(dev) + 1,
			      1ULL << IOVP_SHIFT) >> IOVP_SHIFT;

	if (pages_needed <= 8) {
		/*
		 * LAN traffic will not thrash the TLB IFF the same NIC
		 * uses 8 adjacent pages to map separate payload data.
		 * ie the same byte in the resource bit map.
		 */
#if 0
		/* FIXME: bit search should shift it's way through
		 * an unsigned long - not byte at a time. As it is now,
		 * we effectively allocate this byte to this mapping.
		 */
		unsigned long mask = ~(~0UL >> pages_needed);
		CCIO_FIND_FREE_MAPPING(ioc, res_idx, mask, 8);
#else
		CCIO_FIND_FREE_MAPPING(ioc, res_idx, 0xff, 8);
#endif
	} else if (pages_needed <= 16) {
		CCIO_FIND_FREE_MAPPING(ioc, res_idx, 0xffff, 16);
	} else if (pages_needed <= 32) {
		CCIO_FIND_FREE_MAPPING(ioc, res_idx, ~(unsigned int)0, 32);
#ifdef __LP64__
	} else if (pages_needed <= 64) {
		CCIO_FIND_FREE_MAPPING(ioc, res_idx, ~0UL, 64);
#endif
	} else {
		panic("%s: %s() Too many pages to map. pages_needed: %u\n",
		       __FILE__,  __func__, pages_needed);
	}

	panic("%s: %s() I/O MMU is out of mapping resources.\n", __FILE__,
	      __func__);
	
resource_found:
	
	DBG_RES("%s() res_idx %d res_hint: %d\n",
		__func__, res_idx, ioc->res_hint);

#ifdef CCIO_COLLECT_STATS
	{
		unsigned long cr_end = mfctl(16);
		unsigned long tmp = cr_end - cr_start;
		/* check for roll over */
		cr_start = (cr_end < cr_start) ?  -(tmp) : (tmp);
	}
	ioc->avg_search[ioc->avg_idx++] = cr_start;
	ioc->avg_idx &= CCIO_SEARCH_SAMPLE - 1;
	ioc->used_pages += pages_needed;
#endif
	/* 
	** return the bit address.
	*/
	return res_idx << 3;
}

#define CCIO_FREE_MAPPINGS(ioc, res_idx, mask, size) \
        u##size *res_ptr = (u##size *)&((ioc)->res_map[res_idx]); \
        BUG_ON((*res_ptr & mask) != mask); \
        *res_ptr &= ~(mask);

/**
 * ccio_free_range - Free pages from the ioc's resource map.
 * @ioc: The I/O Controller.
 * @iova: The I/O Virtual Address.
 * @pages_mapped: The requested number of pages to be freed from the
 * I/O Pdir.
 *
 * This function frees the resouces allocated for the iova.
 */
static void
ccio_free_range(struct ioc *ioc, dma_addr_t iova, unsigned long pages_mapped)
{
	unsigned long iovp = CCIO_IOVP(iova);
	unsigned int res_idx = PDIR_INDEX(iovp) >> 3;

	BUG_ON(pages_mapped == 0);
	BUG_ON((pages_mapped * IOVP_SIZE) > DMA_CHUNK_SIZE);
	BUG_ON(pages_mapped > BITS_PER_LONG);

	DBG_RES("%s():  res_idx: %d pages_mapped %d\n", 
		__func__, res_idx, pages_mapped);

#ifdef CCIO_COLLECT_STATS
	ioc->used_pages -= pages_mapped;
#endif

	if(pages_mapped <= 8) {
#if 0
		/* see matching comments in alloc_range */
		unsigned long mask = ~(~0UL >> pages_mapped);
		CCIO_FREE_MAPPINGS(ioc, res_idx, mask, 8);
#else
		CCIO_FREE_MAPPINGS(ioc, res_idx, 0xffUL, 8);
#endif
	} else if(pages_mapped <= 16) {
		CCIO_FREE_MAPPINGS(ioc, res_idx, 0xffffUL, 16);
	} else if(pages_mapped <= 32) {
		CCIO_FREE_MAPPINGS(ioc, res_idx, ~(unsigned int)0, 32);
#ifdef __LP64__
	} else if(pages_mapped <= 64) {
		CCIO_FREE_MAPPINGS(ioc, res_idx, ~0UL, 64);
#endif
	} else {
		panic("%s:%s() Too many pages to unmap.\n", __FILE__,
		      __func__);
	}
}

/****************************************************************
**
**          CCIO dma_ops support routines
**
*****************************************************************/

typedef unsigned long space_t;
#define KERNEL_SPACE 0

/*
** DMA "Page Type" and Hints 
** o if SAFE_DMA isn't set, mapping is for FAST_DMA. SAFE_DMA should be
**   set for subcacheline DMA transfers since we don't want to damage the
**   other part of a cacheline.
** o SAFE_DMA must be set for "memory" allocated via pci_alloc_consistent().
**   This bit tells U2 to do R/M/W for partial cachelines. "Streaming"
**   data can avoid this if the mapping covers full cache lines.
** o STOP_MOST is needed for atomicity across cachelines.
**   Apparently only "some EISA devices" need this.
**   Using CONFIG_ISA is hack. Only the IOA with EISA under it needs
**   to use this hint iff the EISA devices needs this feature.
**   According to the U2 ERS, STOP_MOST enabled pages hurt performance.
** o PREFETCH should *not* be set for cases like Multiple PCI devices
**   behind GSCtoPCI (dino) bus converter. Only one cacheline per GSC
**   device can be fetched and multiply DMA streams will thrash the
**   prefetch buffer and burn memory bandwidth. See 6.7.3 "Prefetch Rules
**   and Invalidation of Prefetch Entries".
**
** FIXME: the default hints need to be per GSC device - not global.
** 
** HP-UX dorks: linux device driver programming model is totally different
**    than HP-UX's. HP-UX always sets HINT_PREFETCH since it's drivers
**    do special things to work on non-coherent platforms...linux has to
**    be much more careful with this.
*/
#define IOPDIR_VALID    0x01UL
#define HINT_SAFE_DMA   0x02UL	/* used for pci_alloc_consistent() pages */
#ifdef CONFIG_EISA
#define HINT_STOP_MOST  0x04UL	/* LSL support */
#else
#define HINT_STOP_MOST  0x00UL	/* only needed for "some EISA devices" */
#endif
#define HINT_UDPATE_ENB 0x08UL  /* not used/supported by U2 */
#define HINT_PREFETCH   0x10UL	/* for outbound pages which are not SAFE */


/*
** Use direction (ie PCI_DMA_TODEVICE) to pick hint.
** ccio_alloc_consistent() depends on this to get SAFE_DMA
** when it passes in BIDIRECTIONAL flag.
*/
static u32 hint_lookup[] = {
	[PCI_DMA_BIDIRECTIONAL]	= HINT_STOP_MOST | HINT_SAFE_DMA | IOPDIR_VALID,
	[PCI_DMA_TODEVICE]	= HINT_STOP_MOST | HINT_PREFETCH | IOPDIR_VALID,
	[PCI_DMA_FROMDEVICE]	= HINT_STOP_MOST | IOPDIR_VALID,
};

/**
 * ccio_io_pdir_entry - Initialize an I/O Pdir.
 * @pdir_ptr: A pointer into I/O Pdir.
 * @sid: The Space Identifier.
 * @vba: The virtual address.
 * @hints: The DMA Hint.
 *
 * Given a virtual address (vba, arg2) and space id, (sid, arg1),
 * load the I/O PDIR entry pointed to by pdir_ptr (arg0). Each IO Pdir
 * entry consists of 8 bytes as shown below (MSB == bit 0):
 *
 *
 * WORD 0:
 * +------+----------------+-----------------------------------------------+
 * | Phys | Virtual Index  |               Phys                            |
 * | 0:3  |     0:11       |               4:19                            |
 * |4 bits|   12 bits      |              16 bits                          |
 * +------+----------------+-----------------------------------------------+
 * WORD 1:
 * +-----------------------+-----------------------------------------------+
 * |      Phys    |  Rsvd  | Prefetch |Update |Rsvd  |Lock  |Safe  |Valid  |
 * |     20:39    |        | Enable   |Enable |      |Enable|DMA   |       |
 * |    20 bits   | 5 bits | 1 bit    |1 bit  |2 bits|1 bit |1 bit |1 bit  |
 * +-----------------------+-----------------------------------------------+
 *
 * The virtual index field is filled with the results of the LCI
 * (Load Coherence Index) instruction.  The 8 bits used for the virtual
 * index are bits 12:19 of the value returned by LCI.
 */ 
static void CCIO_INLINE
ccio_io_pdir_entry(u64 *pdir_ptr, space_t sid, unsigned long vba,
		   unsigned long hints)
{
	register unsigned long pa;
	register unsigned long ci; /* coherent index */

	/* We currently only support kernel addresses */
	BUG_ON(sid != KERNEL_SPACE);

	mtsp(sid,1);

	/*
	** WORD 1 - low order word
	** "hints" parm includes the VALID bit!
	** "dep" clobbers the physical address offset bits as well.
	*/
	pa = virt_to_phys(vba);
	asm volatile("depw  %1,31,12,%0" : "+r" (pa) : "r" (hints));
	((u32 *)pdir_ptr)[1] = (u32) pa;

	/*
	** WORD 0 - high order word
	*/

#ifdef __LP64__
	/*
	** get bits 12:15 of physical address
	** shift bits 16:31 of physical address
	** and deposit them
	*/
	asm volatile ("extrd,u %1,15,4,%0" : "=r" (ci) : "r" (pa));
	asm volatile ("extrd,u %1,31,16,%0" : "+r" (pa) : "r" (pa));
	asm volatile ("depd  %1,35,4,%0" : "+r" (pa) : "r" (ci));
#else
	pa = 0;
#endif
	/*
	** get CPU coherency index bits
	** Grab virtual index [0:11]
	** Deposit virt_idx bits into I/O PDIR word
	*/
	asm volatile ("lci %%r0(%%sr1, %1), %0" : "=r" (ci) : "r" (vba));
	asm volatile ("extru %1,19,12,%0" : "+r" (ci) : "r" (ci));
	asm volatile ("depw  %1,15,12,%0" : "+r" (pa) : "r" (ci));

	((u32 *)pdir_ptr)[0] = (u32) pa;


	/* FIXME: PCX_W platforms don't need FDC/SYNC. (eg C360)
	**        PCX-U/U+ do. (eg C200/C240)
	**        PCX-T'? Don't know. (eg C110 or similar K-class)
	**
	** See PDC_MODEL/option 0/SW_CAP word for "Non-coherent IO-PDIR bit".
	** Hopefully we can patch (NOP) these out at boot time somehow.
	**
	** "Since PCX-U employs an offset hash that is incompatible with
	** the real mode coherence index generation of U2, the PDIR entry
	** must be flushed to memory to retain coherence."
	*/
	asm volatile("fdc %%r0(%0)" : : "r" (pdir_ptr));
	asm volatile("sync");
}

/**
 * ccio_clear_io_tlb - Remove stale entries from the I/O TLB.
 * @ioc: The I/O Controller.
 * @iovp: The I/O Virtual Page.
 * @byte_cnt: The requested number of bytes to be freed from the I/O Pdir.
 *
 * Purge invalid I/O PDIR entries from the I/O TLB.
 *
 * FIXME: Can we change the byte_cnt to pages_mapped?
 */
static CCIO_INLINE void
ccio_clear_io_tlb(struct ioc *ioc, dma_addr_t iovp, size_t byte_cnt)
{
	u32 chain_size = 1 << ioc->chainid_shift;

	iovp &= IOVP_MASK;	/* clear offset bits, just want pagenum */
	byte_cnt += chain_size;

	while(byte_cnt > chain_size) {
		WRITE_U32(CMD_TLB_PURGE | iovp, &ioc->ioc_regs->io_command);
		iovp += chain_size;
		byte_cnt -= chain_size;
	}
}

/**
 * ccio_mark_invalid - Mark the I/O Pdir entries invalid.
 * @ioc: The I/O Controller.
 * @iova: The I/O Virtual Address.
 * @byte_cnt: The requested number of bytes to be freed from the I/O Pdir.
 *
 * Mark the I/O Pdir entries invalid and blow away the corresponding I/O
 * TLB entries.
 *
 * FIXME: at some threshold it might be "cheaper" to just blow
 *        away the entire I/O TLB instead of individual entries.
 *
 * FIXME: Uturn has 256 TLB entries. We don't need to purge every
 *        PDIR entry - just once for each possible TLB entry.
 *        (We do need to maker I/O PDIR entries invalid regardless).
 *
 * FIXME: Can we change byte_cnt to pages_mapped?
 */ 
static CCIO_INLINE void
ccio_mark_invalid(struct ioc *ioc, dma_addr_t iova, size_t byte_cnt)
{
	u32 iovp = (u32)CCIO_IOVP(iova);
	size_t saved_byte_cnt;

	/* round up to nearest page size */
	saved_byte_cnt = byte_cnt = ALIGN(byte_cnt, IOVP_SIZE);

	while(byte_cnt > 0) {
		/* invalidate one page at a time */
		unsigned int idx = PDIR_INDEX(iovp);
		char *pdir_ptr = (char *) &(ioc->pdir_base[idx]);

		BUG_ON(idx >= (ioc->pdir_size / sizeof(u64)));
		pdir_ptr[7] = 0;	/* clear only VALID bit */ 
		/*
		** FIXME: PCX_W platforms don't need FDC/SYNC. (eg C360)
		**   PCX-U/U+ do. (eg C200/C240)
		** See PDC_MODEL/option 0/SW_CAP for "Non-coherent IO-PDIR bit".
		**
		** Hopefully someone figures out how to patch (NOP) the
		** FDC/SYNC out at boot time.
		*/
		asm volatile("fdc %%r0(%0)" : : "r" (pdir_ptr[7]));

		iovp     += IOVP_SIZE;
		byte_cnt -= IOVP_SIZE;
	}

	asm volatile("sync");
	ccio_clear_io_tlb(ioc, CCIO_IOVP(iova), saved_byte_cnt);
}

/****************************************************************
**
**          CCIO dma_ops
**
*****************************************************************/

/**
 * ccio_dma_supported - Verify the IOMMU supports the DMA address range.
 * @dev: The PCI device.
 * @mask: A bit mask describing the DMA address range of the device.
 */
static int 
ccio_dma_supported(struct device *dev, u64 mask)
{
	if(dev == NULL) {
		printk(KERN_ERR MODULE_NAME ": EISA/ISA/et al not supported\n");
		BUG();
		return 0;
	}

	/* only support 32-bit devices (ie PCI/GSC) */
	return (int)(mask == 0xffffffffUL);
}

/**
 * ccio_map_single - Map an address range into the IOMMU.
 * @dev: The PCI device.
 * @addr: The start address of the DMA region.
 * @size: The length of the DMA region.
 * @direction: The direction of the DMA transaction (to/from device).
 *
 * This function implements the pci_map_single function.
 */
static dma_addr_t 
ccio_map_single(struct device *dev, void *addr, size_t size,
		enum dma_data_direction direction)
{
	int idx;
	struct ioc *ioc;
	unsigned long flags;
	dma_addr_t iovp;
	dma_addr_t offset;
	u64 *pdir_start;
	unsigned long hint = hint_lookup[(int)direction];

	BUG_ON(!dev);
	ioc = GET_IOC(dev);
	if (!ioc)
		return CCIO_MAPPING_ERROR;

	BUG_ON(size <= 0);

	/* save offset bits */
	offset = ((unsigned long) addr) & ~IOVP_MASK;

	/* round up to nearest IOVP_SIZE */
	size = ALIGN(size + offset, IOVP_SIZE);
	spin_lock_irqsave(&ioc->res_lock, flags);

#ifdef CCIO_COLLECT_STATS
	ioc->msingle_calls++;
	ioc->msingle_pages += size >> IOVP_SHIFT;
#endif

	idx = ccio_alloc_range(ioc, dev, size);
	iovp = (dma_addr_t)MKIOVP(idx);

	pdir_start = &(ioc->pdir_base[idx]);

	DBG_RUN("%s() 0x%p -> 0x%lx size: %0x%x\n",
		__func__, addr, (long)iovp | offset, size);

	/* If not cacheline aligned, force SAFE_DMA on the whole mess */
	if((size % L1_CACHE_BYTES) || ((unsigned long)addr % L1_CACHE_BYTES))
		hint |= HINT_SAFE_DMA;

	while(size > 0) {
		ccio_io_pdir_entry(pdir_start, KERNEL_SPACE, (unsigned long)addr, hint);

		DBG_RUN(" pdir %p %08x%08x\n",
			pdir_start,
			(u32) (((u32 *) pdir_start)[0]),
			(u32) (((u32 *) pdir_start)[1]));
		++pdir_start;
		addr += IOVP_SIZE;
		size -= IOVP_SIZE;
	}

	spin_unlock_irqrestore(&ioc->res_lock, flags);

	/* form complete address */
	return CCIO_IOVA(iovp, offset);
}


static dma_addr_t
ccio_map_page(struct device *dev, struct page *page, unsigned long offset,
		size_t size, enum dma_data_direction direction,
		unsigned long attrs)
{
	return ccio_map_single(dev, page_address(page) + offset, size,
			direction);
}


/**
 * ccio_unmap_page - Unmap an address range from the IOMMU.
 * @dev: The PCI device.
 * @addr: The start address of the DMA region.
 * @size: The length of the DMA region.
 * @direction: The direction of the DMA transaction (to/from device).
 */
static void 
ccio_unmap_page(struct device *dev, dma_addr_t iova, size_t size,
		enum dma_data_direction direction, unsigned long attrs)
{
	struct ioc *ioc;
	unsigned long flags; 
	dma_addr_t offset = iova & ~IOVP_MASK;
	
	BUG_ON(!dev);
	ioc = GET_IOC(dev);
	if (!ioc) {
		WARN_ON(!ioc);
		return;
	}

	DBG_RUN("%s() iovp 0x%lx/%x\n",
		__func__, (long)iova, size);

	iova ^= offset;        /* clear offset bits */
	size += offset;
	size = ALIGN(size, IOVP_SIZE);

	spin_lock_irqsave(&ioc->res_lock, flags);

#ifdef CCIO_COLLECT_STATS
	ioc->usingle_calls++;
	ioc->usingle_pages += size >> IOVP_SHIFT;
#endif

	ccio_mark_invalid(ioc, iova, size);
	ccio_free_range(ioc, iova, (size >> IOVP_SHIFT));
	spin_unlock_irqrestore(&ioc->res_lock, flags);
}

/**
 * ccio_alloc - Allocate a consistent DMA mapping.
 * @dev: The PCI device.
 * @size: The length of the DMA region.
 * @dma_handle: The DMA address handed back to the device (not the cpu).
 *
 * This function implements the pci_alloc_consistent function.
 */
static void * 
ccio_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t flag,
		unsigned long attrs)
{
      void *ret;
#if 0
/* GRANT Need to establish hierarchy for non-PCI devs as well
** and then provide matching gsc_map_xxx() functions for them as well.
*/
	if(!hwdev) {
		/* only support PCI */
		*dma_handle = 0;
		return 0;
	}
#endif
        ret = (void *) __get_free_pages(flag, get_order(size));

	if (ret) {
		memset(ret, 0, size);
		*dma_handle = ccio_map_single(dev, ret, size, PCI_DMA_BIDIRECTIONAL);
	}

	return ret;
}

/**
 * ccio_free - Free a consistent DMA mapping.
 * @dev: The PCI device.
 * @size: The length of the DMA region.
 * @cpu_addr: The cpu address returned from the ccio_alloc_consistent.
 * @dma_handle: The device address returned from the ccio_alloc_consistent.
 *
 * This function implements the pci_free_consistent function.
 */
static void 
ccio_free(struct device *dev, size_t size, void *cpu_addr,
		dma_addr_t dma_handle, unsigned long attrs)
{
	ccio_unmap_page(dev, dma_handle, size, 0, 0);
	free_pages((unsigned long)cpu_addr, get_order(size));
}

/*
** Since 0 is a valid pdir_base index value, can't use that
** to determine if a value is valid or not. Use a flag to indicate
** the SG list entry contains a valid pdir index.
*/
#define PIDE_FLAG 0x80000000UL

#ifdef CCIO_COLLECT_STATS
#define IOMMU_MAP_STATS
#endif
#include "iommu-helpers.h"

/**
 * ccio_map_sg - Map the scatter/gather list into the IOMMU.
 * @dev: The PCI device.
 * @sglist: The scatter/gather list to be mapped in the IOMMU.
 * @nents: The number of entries in the scatter/gather list.
 * @direction: The direction of the DMA transaction (to/from device).
 *
 * This function implements the pci_map_sg function.
 */
static int
ccio_map_sg(struct device *dev, struct scatterlist *sglist, int nents, 
	    enum dma_data_direction direction, unsigned long attrs)
{
	struct ioc *ioc;
	int coalesced, filled = 0;
	unsigned long flags;
	unsigned long hint = hint_lookup[(int)direction];
	unsigned long prev_len = 0, current_len = 0;
	int i;
	
	BUG_ON(!dev);
	ioc = GET_IOC(dev);
	if (!ioc)
		return 0;
	
	DBG_RUN_SG("%s() START %d entries\n", __func__, nents);

	/* Fast path single entry scatterlists. */
	if (nents == 1) {
		sg_dma_address(sglist) = ccio_map_single(dev,
				sg_virt(sglist), sglist->length,
				direction);
		sg_dma_len(sglist) = sglist->length;
		return 1;
	}

	for(i = 0; i < nents; i++)
		prev_len += sglist[i].length;
	
	spin_lock_irqsave(&ioc->res_lock, flags);

#ifdef CCIO_COLLECT_STATS
	ioc->msg_calls++;
#endif

	/*
	** First coalesce the chunks and allocate I/O pdir space
	**
	** If this is one DMA stream, we can properly map using the
	** correct virtual address associated with each DMA page.
	** w/o this association, we wouldn't have coherent DMA!
	** Access to the virtual address is what forces a two pass algorithm.
	*/
	coalesced = iommu_coalesce_chunks(ioc, dev, sglist, nents, ccio_alloc_range);

	/*
	** Program the I/O Pdir
	**
	** map the virtual addresses to the I/O Pdir
	** o dma_address will contain the pdir index
	** o dma_len will contain the number of bytes to map 
	** o page/offset contain the virtual address.
	*/
	filled = iommu_fill_pdir(ioc, sglist, nents, hint, ccio_io_pdir_entry);

	spin_unlock_irqrestore(&ioc->res_lock, flags);

	BUG_ON(coalesced != filled);

	DBG_RUN_SG("%s() DONE %d mappings\n", __func__, filled);

	for (i = 0; i < filled; i++)
		current_len += sg_dma_len(sglist + i);

	BUG_ON(current_len != prev_len);

	return filled;
}

/**
 * ccio_unmap_sg - Unmap the scatter/gather list from the IOMMU.
 * @dev: The PCI device.
 * @sglist: The scatter/gather list to be unmapped from the IOMMU.
 * @nents: The number of entries in the scatter/gather list.
 * @direction: The direction of the DMA transaction (to/from device).
 *
 * This function implements the pci_unmap_sg function.
 */
static void 
ccio_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents, 
	      enum dma_data_direction direction, unsigned long attrs)
{
	struct ioc *ioc;

	BUG_ON(!dev);
	ioc = GET_IOC(dev);
	if (!ioc) {
		WARN_ON(!ioc);
		return;
	}

	DBG_RUN_SG("%s() START %d entries, %p,%x\n",
		__func__, nents, sg_virt(sglist), sglist->length);

#ifdef CCIO_COLLECT_STATS
	ioc->usg_calls++;
#endif

	while(sg_dma_len(sglist) && nents--) {

#ifdef CCIO_COLLECT_STATS
		ioc->usg_pages += sg_dma_len(sglist) >> PAGE_SHIFT;
#endif
		ccio_unmap_page(dev, sg_dma_address(sglist),
				  sg_dma_len(sglist), direction, 0);
		++sglist;
	}

	DBG_RUN_SG("%s() DONE (nents %d)\n", __func__, nents);
}

static int ccio_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
	return dma_addr == CCIO_MAPPING_ERROR;
}

static const struct dma_map_ops ccio_ops = {
	.dma_supported =	ccio_dma_supported,
	.alloc =		ccio_alloc,
	.free =			ccio_free,
	.map_page =		ccio_map_page,
	.unmap_page =		ccio_unmap_page,
	.map_sg = 		ccio_map_sg,
	.unmap_sg = 		ccio_unmap_sg,
	.mapping_error =	ccio_mapping_error,
};

#ifdef CONFIG_PROC_FS
static int ccio_proc_info(struct seq_file *m, void *p)
{
	struct ioc *ioc = ioc_list;

	while (ioc != NULL) {
		unsigned int total_pages = ioc->res_size << 3;
#ifdef CCIO_COLLECT_STATS
		unsigned long avg = 0, min, max;
		int j;
#endif

		seq_printf(m, "%s\n", ioc->name);
		
		seq_printf(m, "Cujo 2.0 bug    : %s\n",
			   (ioc->cujo20_bug ? "yes" : "no"));
		
		seq_printf(m, "IO PDIR size    : %d bytes (%d entries)\n",
			   total_pages * 8, total_pages);

#ifdef CCIO_COLLECT_STATS
		seq_printf(m, "IO PDIR entries : %ld free  %ld used (%d%%)\n",
			   total_pages - ioc->used_pages, ioc->used_pages,
			   (int)(ioc->used_pages * 100 / total_pages));
#endif

		seq_printf(m, "Resource bitmap : %d bytes (%d pages)\n",
			   ioc->res_size, total_pages);

#ifdef CCIO_COLLECT_STATS
		min = max = ioc->avg_search[0];
		for(j = 0; j < CCIO_SEARCH_SAMPLE; ++j) {
			avg += ioc->avg_search[j];
			if(ioc->avg_search[j] > max) 
				max = ioc->avg_search[j];
			if(ioc->avg_search[j] < min) 
				min = ioc->avg_search[j];
		}
		avg /= CCIO_SEARCH_SAMPLE;
		seq_printf(m, "  Bitmap search : %ld/%ld/%ld (min/avg/max CPU Cycles)\n",
			   min, avg, max);

		seq_printf(m, "pci_map_single(): %8ld calls  %8ld pages (avg %d/1000)\n",
			   ioc->msingle_calls, ioc->msingle_pages,
			   (int)((ioc->msingle_pages * 1000)/ioc->msingle_calls));

		/* KLUGE - unmap_sg calls unmap_page for each mapped page */
		min = ioc->usingle_calls - ioc->usg_calls;
		max = ioc->usingle_pages - ioc->usg_pages;
		seq_printf(m, "pci_unmap_single: %8ld calls  %8ld pages (avg %d/1000)\n",
			   min, max, (int)((max * 1000)/min));
 
		seq_printf(m, "pci_map_sg()    : %8ld calls  %8ld pages (avg %d/1000)\n",
			   ioc->msg_calls, ioc->msg_pages,
			   (int)((ioc->msg_pages * 1000)/ioc->msg_calls));

		seq_printf(m, "pci_unmap_sg()  : %8ld calls  %8ld pages (avg %d/1000)\n\n\n",
			   ioc->usg_calls, ioc->usg_pages,
			   (int)((ioc->usg_pages * 1000)/ioc->usg_calls));
#endif	/* CCIO_COLLECT_STATS */

		ioc = ioc->next;
	}

	return 0;
}

static int ccio_proc_info_open(struct inode *inode, struct file *file)
{
	return single_open(file, &ccio_proc_info, NULL);
}

static const struct file_operations ccio_proc_info_fops = {
	.owner = THIS_MODULE,
	.open = ccio_proc_info_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

static int ccio_proc_bitmap_info(struct seq_file *m, void *p)
{
	struct ioc *ioc = ioc_list;

	while (ioc != NULL) {
		seq_hex_dump(m, "   ", DUMP_PREFIX_NONE, 32, 4, ioc->res_map,
			     ioc->res_size, false);
		seq_putc(m, '\n');
		ioc = ioc->next;
		break; /* XXX - remove me */
	}

	return 0;
}

static int ccio_proc_bitmap_open(struct inode *inode, struct file *file)
{
	return single_open(file, &ccio_proc_bitmap_info, NULL);
}

static const struct file_operations ccio_proc_bitmap_fops = {
	.owner = THIS_MODULE,
	.open = ccio_proc_bitmap_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};
#endif /* CONFIG_PROC_FS */

/**
 * ccio_find_ioc - Find the ioc in the ioc_list
 * @hw_path: The hardware path of the ioc.
 *
 * This function searches the ioc_list for an ioc that matches
 * the provide hardware path.
 */
static struct ioc * ccio_find_ioc(int hw_path)
{
	int i;
	struct ioc *ioc;

	ioc = ioc_list;
	for (i = 0; i < ioc_count; i++) {
		if (ioc->hw_path == hw_path)
			return ioc;

		ioc = ioc->next;
	}

	return NULL;
}

/**
 * ccio_get_iommu - Find the iommu which controls this device
 * @dev: The parisc device.
 *
 * This function searches through the registered IOMMU's and returns
 * the appropriate IOMMU for the device based on its hardware path.
 */
void * ccio_get_iommu(const struct parisc_device *dev)
{
	dev = find_pa_parent_type(dev, HPHW_IOA);
	if (!dev)
		return NULL;

	return ccio_find_ioc(dev->hw_path);
}

#define CUJO_20_STEP       0x10000000	/* inc upper nibble */

/* Cujo 2.0 has a bug which will silently corrupt data being transferred
 * to/from certain pages.  To avoid this happening, we mark these pages
 * as `used', and ensure that nothing will try to allocate from them.
 */
void ccio_cujo20_fixup(struct parisc_device *cujo, u32 iovp)
{
	unsigned int idx;
	struct parisc_device *dev = parisc_parent(cujo);
	struct ioc *ioc = ccio_get_iommu(dev);
	u8 *res_ptr;

	ioc->cujo20_bug = 1;
	res_ptr = ioc->res_map;
	idx = PDIR_INDEX(iovp) >> 3;

	while (idx < ioc->res_size) {
 		res_ptr[idx] |= 0xff;
		idx += PDIR_INDEX(CUJO_20_STEP) >> 3;
	}
}

#if 0
/* GRANT -  is this needed for U2 or not? */

/*
** Get the size of the I/O TLB for this I/O MMU.
**
** If spa_shift is non-zero (ie probably U2),
** then calculate the I/O TLB size using spa_shift.
**
** Otherwise we are supposed to get the IODC entry point ENTRY TLB
** and execute it. However, both U2 and Uturn firmware supplies spa_shift.
** I think only Java (K/D/R-class too?) systems don't do this.
*/
static int
ccio_get_iotlb_size(struct parisc_device *dev)
{
	if (dev->spa_shift == 0) {
		panic("%s() : Can't determine I/O TLB size.\n", __func__);
	}
	return (1 << dev->spa_shift);
}
#else

/* Uturn supports 256 TLB entries */
#define CCIO_CHAINID_SHIFT	8
#define CCIO_CHAINID_MASK	0xff
#endif /* 0 */

/* We *can't* support JAVA (T600). Venture there at your own risk. */
static const struct parisc_device_id ccio_tbl[] __initconst = {
	{ HPHW_IOA, HVERSION_REV_ANY_ID, U2_IOA_RUNWAY, 0xb }, /* U2 */
	{ HPHW_IOA, HVERSION_REV_ANY_ID, UTURN_IOA_RUNWAY, 0xb }, /* UTurn */
	{ 0, }
};

static int ccio_probe(struct parisc_device *dev);

static struct parisc_driver ccio_driver __refdata = {
	.name =		"ccio",
	.id_table =	ccio_tbl,
	.probe =	ccio_probe,
};

/**
 * ccio_ioc_init - Initialize the I/O Controller
 * @ioc: The I/O Controller.
 *
 * Initialize the I/O Controller which includes setting up the
 * I/O Page Directory, the resource map, and initalizing the
 * U2/Uturn chip into virtual mode.
 */
static void
ccio_ioc_init(struct ioc *ioc)
{
	int i;
	unsigned int iov_order;
	u32 iova_space_size;

	/*
	** Determine IOVA Space size from memory size.
	**
	** Ideally, PCI drivers would register the maximum number
	** of DMA they can have outstanding for each device they
	** own.  Next best thing would be to guess how much DMA
	** can be outstanding based on PCI Class/sub-class. Both
	** methods still require some "extra" to support PCI
	** Hot-Plug/Removal of PCI cards. (aka PCI OLARD).
	*/

	iova_space_size = (u32) (totalram_pages / count_parisc_driver(&ccio_driver));

	/* limit IOVA space size to 1MB-1GB */

	if (iova_space_size < (1 << (20 - PAGE_SHIFT))) {
		iova_space_size =  1 << (20 - PAGE_SHIFT);
#ifdef __LP64__
	} else if (iova_space_size > (1 << (30 - PAGE_SHIFT))) {
		iova_space_size =  1 << (30 - PAGE_SHIFT);
#endif
	}

	/*
	** iova space must be log2() in size.
	** thus, pdir/res_map will also be log2().
	*/

	/* We could use larger page sizes in order to *decrease* the number
	** of mappings needed.  (ie 8k pages means 1/2 the mappings).
	**
	** Note: Grant Grunder says "Using 8k I/O pages isn't trivial either
	**   since the pages must also be physically contiguous - typically
	**   this is the case under linux."
	*/

	iov_order = get_order(iova_space_size << PAGE_SHIFT);

	/* iova_space_size is now bytes, not pages */
	iova_space_size = 1 << (iov_order + PAGE_SHIFT);

	ioc->pdir_size = (iova_space_size / IOVP_SIZE) * sizeof(u64);

	BUG_ON(ioc->pdir_size > 8 * 1024 * 1024);   /* max pdir size <= 8MB */

	/* Verify it's a power of two */
	BUG_ON((1 << get_order(ioc->pdir_size)) != (ioc->pdir_size >> PAGE_SHIFT));

	DBG_INIT("%s() hpa 0x%p mem %luMB IOV %dMB (%d bits)\n",
			__func__, ioc->ioc_regs,
			(unsigned long) totalram_pages >> (20 - PAGE_SHIFT),
			iova_space_size>>20,
			iov_order + PAGE_SHIFT);

	ioc->pdir_base = (u64 *)__get_free_pages(GFP_KERNEL, 
						 get_order(ioc->pdir_size));
	if(NULL == ioc->pdir_base) {
		panic("%s() could not allocate I/O Page Table\n", __func__);
	}
	memset(ioc->pdir_base, 0, ioc->pdir_size);

	BUG_ON((((unsigned long)ioc->pdir_base) & PAGE_MASK) != (unsigned long)ioc->pdir_base);
	DBG_INIT(" base %p\n", ioc->pdir_base);

	/* resource map size dictated by pdir_size */
 	ioc->res_size = (ioc->pdir_size / sizeof(u64)) >> 3;
	DBG_INIT("%s() res_size 0x%x\n", __func__, ioc->res_size);
	
	ioc->res_map = (u8 *)__get_free_pages(GFP_KERNEL, 
					      get_order(ioc->res_size));
	if(NULL == ioc->res_map) {
		panic("%s() could not allocate resource map\n", __func__);
	}
	memset(ioc->res_map, 0, ioc->res_size);

	/* Initialize the res_hint to 16 */
	ioc->res_hint = 16;

	/* Initialize the spinlock */
	spin_lock_init(&ioc->res_lock);

	/*
	** Chainid is the upper most bits of an IOVP used to determine
	** which TLB entry an IOVP will use.
	*/
	ioc->chainid_shift = get_order(iova_space_size) + PAGE_SHIFT - CCIO_CHAINID_SHIFT;
	DBG_INIT(" chainid_shift 0x%x\n", ioc->chainid_shift);

	/*
	** Initialize IOA hardware
	*/
	WRITE_U32(CCIO_CHAINID_MASK << ioc->chainid_shift, 
		  &ioc->ioc_regs->io_chain_id_mask);

	WRITE_U32(virt_to_phys(ioc->pdir_base), 
		  &ioc->ioc_regs->io_pdir_base);

	/*
	** Go to "Virtual Mode"
	*/
	WRITE_U32(IOA_NORMAL_MODE, &ioc->ioc_regs->io_control);

	/*
	** Initialize all I/O TLB entries to 0 (Valid bit off).
	*/
	WRITE_U32(0, &ioc->ioc_regs->io_tlb_entry_m);
	WRITE_U32(0, &ioc->ioc_regs->io_tlb_entry_l);

	for(i = 1 << CCIO_CHAINID_SHIFT; i ; i--) {
		WRITE_U32((CMD_TLB_DIRECT_WRITE | (i << ioc->chainid_shift)),
			  &ioc->ioc_regs->io_command);
	}
}

static void __init
ccio_init_resource(struct resource *res, char *name, void __iomem *ioaddr)
{
	int result;

	res->parent = NULL;
	res->flags = IORESOURCE_MEM;
	/*
	 * bracing ((signed) ...) are required for 64bit kernel because
	 * we only want to sign extend the lower 16 bits of the register.
	 * The upper 16-bits of range registers are hardcoded to 0xffff.
	 */
	res->start = (unsigned long)((signed) READ_U32(ioaddr) << 16);
	res->end = (unsigned long)((signed) (READ_U32(ioaddr + 4) << 16) - 1);
	res->name = name;
	/*
	 * Check if this MMIO range is disable
	 */
	if (res->end + 1 == res->start)
		return;

	/* On some platforms (e.g. K-Class), we have already registered
	 * resources for devices reported by firmware. Some are children
	 * of ccio.
	 * "insert" ccio ranges in the mmio hierarchy (/proc/iomem).
	 */
	result = insert_resource(&iomem_resource, res);
	if (result < 0) {
		printk(KERN_ERR "%s() failed to claim CCIO bus address space (%08lx,%08lx)\n", 
			__func__, (unsigned long)res->start, (unsigned long)res->end);
	}
}

static void __init ccio_init_resources(struct ioc *ioc)
{
	struct resource *res = ioc->mmio_region;
	char *name = kmalloc(14, GFP_KERNEL);

	snprintf(name, 14, "GSC Bus [%d/]", ioc->hw_path);

	ccio_init_resource(res, name, &ioc->ioc_regs->io_io_low);
	ccio_init_resource(res + 1, name, &ioc->ioc_regs->io_io_low_hv);
}

static int new_ioc_area(struct resource *res, unsigned long size,
		unsigned long min, unsigned long max, unsigned long align)
{
	if (max <= min)
		return -EBUSY;

	res->start = (max - size + 1) &~ (align - 1);
	res->end = res->start + size;
	
	/* We might be trying to expand the MMIO range to include
	 * a child device that has already registered it's MMIO space.
	 * Use "insert" instead of request_resource().
	 */
	if (!insert_resource(&iomem_resource, res))
		return 0;

	return new_ioc_area(res, size, min, max - size, align);
}

static int expand_ioc_area(struct resource *res, unsigned long size,
		unsigned long min, unsigned long max, unsigned long align)
{
	unsigned long start, len;

	if (!res->parent)
		return new_ioc_area(res, size, min, max, align);

	start = (res->start - size) &~ (align - 1);
	len = res->end - start + 1;
	if (start >= min) {
		if (!adjust_resource(res, start, len))
			return 0;
	}

	start = res->start;
	len = ((size + res->end + align) &~ (align - 1)) - start;
	if (start + len <= max) {
		if (!adjust_resource(res, start, len))
			return 0;
	}

	return -EBUSY;
}

/*
 * Dino calls this function.  Beware that we may get called on systems
 * which have no IOC (725, B180, C160L, etc) but do have a Dino.
 * So it's legal to find no parent IOC.
 *
 * Some other issues: one of the resources in the ioc may be unassigned.
 */
int ccio_allocate_resource(const struct parisc_device *dev,
		struct resource *res, unsigned long size,
		unsigned long min, unsigned long max, unsigned long align)
{
	struct resource *parent = &iomem_resource;
	struct ioc *ioc = ccio_get_iommu(dev);
	if (!ioc)
		goto out;

	parent = ioc->mmio_region;
	if (parent->parent &&
	    !allocate_resource(parent, res, size, min, max, align, NULL, NULL))
		return 0;

	if ((parent + 1)->parent &&
	    !allocate_resource(parent + 1, res, size, min, max, align,
				NULL, NULL))
		return 0;

	if (!expand_ioc_area(parent, size, min, max, align)) {
		__raw_writel(((parent->start)>>16) | 0xffff0000,
			     &ioc->ioc_regs->io_io_low);
		__raw_writel(((parent->end)>>16) | 0xffff0000,
			     &ioc->ioc_regs->io_io_high);
	} else if (!expand_ioc_area(parent + 1, size, min, max, align)) {
		parent++;
		__raw_writel(((parent->start)>>16) | 0xffff0000,
			     &ioc->ioc_regs->io_io_low_hv);
		__raw_writel(((parent->end)>>16) | 0xffff0000,
			     &ioc->ioc_regs->io_io_high_hv);
	} else {
		return -EBUSY;
	}

 out:
	return allocate_resource(parent, res, size, min, max, align, NULL,NULL);
}

int ccio_request_resource(const struct parisc_device *dev,
		struct resource *res)
{
	struct resource *parent;
	struct ioc *ioc = ccio_get_iommu(dev);

	if (!ioc) {
		parent = &iomem_resource;
	} else if ((ioc->mmio_region->start <= res->start) &&
			(res->end <= ioc->mmio_region->end)) {
		parent = ioc->mmio_region;
	} else if (((ioc->mmio_region + 1)->start <= res->start) &&
			(res->end <= (ioc->mmio_region + 1)->end)) {
		parent = ioc->mmio_region + 1;
	} else {
		return -EBUSY;
	}

	/* "transparent" bus bridges need to register MMIO resources
	 * firmware assigned them. e.g. children of hppb.c (e.g. K-class)
	 * registered their resources in the PDC "bus walk" (See
	 * arch/parisc/kernel/inventory.c).
	 */
	return insert_resource(parent, res);
}

/**
 * ccio_probe - Determine if ccio should claim this device.
 * @dev: The device which has been found
 *
 * Determine if ccio should claim this chip (return 0) or not (return 1).
 * If so, initialize the chip and tell other partners in crime they
 * have work to do.
 */
static int __init ccio_probe(struct parisc_device *dev)
{
	int i;
	struct ioc *ioc, **ioc_p = &ioc_list;

	ioc = kzalloc(sizeof(struct ioc), GFP_KERNEL);
	if (ioc == NULL) {
		printk(KERN_ERR MODULE_NAME ": memory allocation failure\n");
		return -ENOMEM;
	}

	ioc->name = dev->id.hversion == U2_IOA_RUNWAY ? "U2" : "UTurn";

	printk(KERN_INFO "Found %s at 0x%lx\n", ioc->name,
		(unsigned long)dev->hpa.start);

	for (i = 0; i < ioc_count; i++) {
		ioc_p = &(*ioc_p)->next;
	}
	*ioc_p = ioc;

	ioc->hw_path = dev->hw_path;
	ioc->ioc_regs = ioremap_nocache(dev->hpa.start, 4096);
	if (!ioc->ioc_regs) {
		kfree(ioc);
		return -ENOMEM;
	}
	ccio_ioc_init(ioc);
	ccio_init_resources(ioc);
	hppa_dma_ops = &ccio_ops;
	dev->dev.platform_data = kzalloc(sizeof(struct pci_hba_data), GFP_KERNEL);

	/* if this fails, no I/O cards will work, so may as well bug */
	BUG_ON(dev->dev.platform_data == NULL);
	HBA_DATA(dev->dev.platform_data)->iommu = ioc;

#ifdef CONFIG_PROC_FS
	if (ioc_count == 0) {
		proc_create(MODULE_NAME, 0, proc_runway_root,
			    &ccio_proc_info_fops);
		proc_create(MODULE_NAME"-bitmap", 0, proc_runway_root,
			    &ccio_proc_bitmap_fops);
	}
#endif
	ioc_count++;

	parisc_has_iommu();
	return 0;
}

/**
 * ccio_init - ccio initialization procedure.
 *
 * Register this driver.
 */
void __init ccio_init(void)
{
	register_parisc_driver(&ccio_driver);
}