Linux preempt-rt

Check our new training course

Real-Time Linux with PREEMPT_RT

Check our new training course
with Creative Commons CC-BY-SA
lecture and lab materials

Bootlin logo

Elixir Cross Referencer

   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
/*
 * Linux/drivers/video/retz3fb.c -- RetinaZ3 frame buffer device
 *
 *    Copyright (C) 1997 Jes Sorensen
 *
 * This file is based on the CyberVision64 frame buffer device and
 * the generic Cirrus Logic driver.
 *
 * cyberfb.c: Copyright (C) 1996 Martin Apel,
 *                               Geert Uytterhoeven
 * clgen.c:   Copyright (C) 1996 Frank Neumann
 *
 * History:
 *   - 22 Jan 97: Initial work
 *   - 14 Feb 97: Screen initialization works somewhat, still only
 *                8-bit packed pixel is supported.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/tty.h>
#include <linux/malloc.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/zorro.h>
#include <linux/init.h>

#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/irq.h>
#include <asm/pgtable.h>

#include <video/fbcon.h>
#include <video/fbcon-cfb8.h>
#include <video/fbcon-cfb16.h>

#include "retz3fb.h"

/* #define DEBUG if(1) */
#define DEBUG if(0)

/*
 * Reserve space for one pattern line.
 *
 * For the time being we only support 4MB boards!
 */

#define PAT_MEM_SIZE 16*3
#define PAT_MEM_OFF  (4*1024*1024 - PAT_MEM_SIZE)

#define arraysize(x)    (sizeof(x)/sizeof(*(x)))

struct retz3fb_par {
	int xres;
	int yres;
	int xres_vir;
	int yres_vir;
	int xoffset;
	int yoffset;
	int bpp;

	struct fb_bitfield red;
	struct fb_bitfield green;
	struct fb_bitfield blue;
	struct fb_bitfield transp;

	int pixclock;
	int left_margin;	/* time from sync to picture	*/
	int right_margin;	/* time from picture to sync	*/
	int upper_margin;	/* time from sync to picture	*/
	int lower_margin;
	int hsync_len;	/* length of horizontal sync	*/
	int vsync_len;	/* length of vertical sync	*/
	int vmode;

	int accel;
};

struct display_data {
	long h_total;		/* Horizontal Total */
	long h_sstart;		/* Horizontal Sync Start */
	long h_sstop;		/* Horizontal Sync Stop */
	long h_bstart;		/* Horizontal Blank Start */
	long h_bstop;		/* Horizontal Blank Stop */
	long h_dispend;		/* Horizontal Display End */
	long v_total;		/* Vertical Total */
	long v_sstart;		/* Vertical Sync Start */
	long v_sstop;		/* Vertical Sync Stop */
	long v_bstart;		/* Vertical Blank Start */
	long v_bstop;		/* Vertical Blank Stop */
	long v_dispend;		/* Horizontal Display End */
};

static struct retz3fb_par current_par;

static int current_par_valid = 0;
static int currcon = 0;

static struct display disp;
static struct fb_info fb_info;


/*
 *    Switch for Chipset Independency
 */

static struct fb_hwswitch {

   /* Initialisation */

   int (*init)(void);

   /* Display Control */

   int (*encode_fix)(struct fb_fix_screeninfo *fix, struct retz3fb_par *par);
   int (*decode_var)(struct fb_var_screeninfo *var, struct retz3fb_par *par);
   int (*encode_var)(struct fb_var_screeninfo *var, struct retz3fb_par *par);
   int (*getcolreg)(unsigned int regno, unsigned int *red, unsigned
		    int *green, unsigned int *blue, unsigned int *transp,
			struct fb_info *info);
   int (*setcolreg)(unsigned int regno, unsigned int red, unsigned int
		    green, unsigned int blue, unsigned int transp,
			struct fb_info *info);
   void (*blank)(int blank);
} *fbhw;


/*
 *    Frame Buffer Name
 */

static char retz3fb_name[16] = "RetinaZ3";


static unsigned char retz3_color_table [256][3];
static unsigned long z3_mem;
static unsigned long z3_fbmem;
static unsigned long z3_size;
static volatile unsigned char *z3_regs;


/*
 * A small info on how to convert XFree86 timing values into fb
 * timings - by Frank Neumann:
 *
An XFree86 mode line consists of the following fields:
 "800x600"     50      800  856  976 1040    600  637  643  666
 < name >     DCF       HR  SH1  SH2  HFL     VR  SV1  SV2  VFL

The fields in the fb_var_screeninfo structure are:
        unsigned long pixclock;         * pixel clock in ps (pico seconds) *
        unsigned long left_margin;      * time from sync to picture    *
        unsigned long right_margin;     * time from picture to sync    *
        unsigned long upper_margin;     * time from sync to picture    *
        unsigned long lower_margin;
        unsigned long hsync_len;        * length of horizontal sync    *
        unsigned long vsync_len;        * length of vertical sync      *

1) Pixelclock:
   xfree: in MHz
   fb: In Picoseconds (ps)

   pixclock = 1000000 / DCF

2) horizontal timings:
   left_margin = HFL - SH2
   right_margin = SH1 - HR
   hsync_len = SH2 - SH1

3) vertical timings:
   upper_margin = VFL - SV2
   lower_margin = SV1 - VR
   vsync_len = SV2 - SV1

Good examples for VESA timings can be found in the XFree86 source tree,
under "programs/Xserver/hw/xfree86/doc/modeDB.txt".
*/

/*
 *    Predefined Video Modes
 */

static struct fb_videomode retz3fb_predefined[] __initdata = {
    /*
     * NB: it is very important to adjust the pixel-clock to the color-depth.
     */

    {
	"640x480", {		/* 640x480, 8 bpp */
	    640, 480, 640, 480, 0, 0, 8, 0,
	    {0, 8, 0}, {0, 8, 0}, {0, 8, 0}, {0, 0, 0},
	    0, 0, -1, -1, FB_ACCELF_TEXT, 38461, 28, 32, 12, 10, 96, 2,
	    FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
	}
    },
    /*
     ModeLine "800x600" 36 800 824 896 1024 600 601 603 625
	      < name > DCF HR  SH1 SH2  HFL VR  SV1 SV2 VFL
     */
    {
	"800x600", {		/* 800x600, 8 bpp */
	    800, 600, 800, 600, 0, 0, 8, 0,
	    {0, 8, 0}, {0, 8, 0}, {0, 8, 0}, {0, 0, 0},
	    0, 0, -1, -1, FB_ACCELF_TEXT, 27778, 64, 24, 22, 1, 120, 2,
	    FB_SYNC_COMP_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
	}
    },
    /*
     ModeLine "1024x768i" 45 1024 1064 1224 1264 768 777 785 817 interlace
	       < name >   DCF HR  SH1  SH2  HFL  VR  SV1 SV2 VFL
     */
    {
	"1024x768i", {		/* 1024x768, 8 bpp, interlaced */
	    1024, 768, 1024, 768, 0, 0, 8, 0,
	    {0, 8, 0}, {0, 8, 0}, {0, 8, 0}, {0, 0, 0},
	    0, 0, -1, -1, FB_ACCELF_TEXT, 22222, 40, 40, 32, 9, 160, 8,
	    FB_SYNC_COMP_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_INTERLACED
	}
    }, {
	"640x480-16", {		/* 640x480, 16 bpp */
	    640, 480, 640, 480, 0, 0, 16, 0,
	    {11, 5, 0}, {5, 6, 0}, {0, 5, 0}, {0, 0, 0},
	    0, 0, -1, -1, 0, 38461/2, 28, 32, 12, 10, 96, 2,
	    FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
	}
    }, {
	"640x480-24", {		/* 640x480, 24 bpp */
	    640, 480, 640, 480, 0, 0, 24, 0,
	    {8, 8, 8}, {8, 8, 8}, {8, 8, 8}, {0, 0, 0},
	    0, 0, -1, -1, 0, 38461/3, 28, 32, 12, 10, 96, 2,
	    FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
	}
    },
};


#define NUM_TOTAL_MODES    arraysize(retz3fb_predefined)

static struct fb_var_screeninfo retz3fb_default;

static int z3fb_inverse = 0;
static int z3fb_mode __initdata = 0;


/*
 *    Interface used by the world
 */

void retz3fb_setup(char *options, int *ints);

static int retz3fb_open(struct fb_info *info, int user);
static int retz3fb_release(struct fb_info *info, int user);
static int retz3fb_get_fix(struct fb_fix_screeninfo *fix, int con,
			   struct fb_info *info);
static int retz3fb_get_var(struct fb_var_screeninfo *var, int con,
			   struct fb_info *info);
static int retz3fb_set_var(struct fb_var_screeninfo *var, int con,
			   struct fb_info *info);
static int retz3fb_get_cmap(struct fb_cmap *cmap, int kspc, int con,
			    struct fb_info *info);
static int retz3fb_set_cmap(struct fb_cmap *cmap, int kspc, int con,
			    struct fb_info *info);
static int retz3fb_pan_display(struct fb_var_screeninfo *var, int con,
			       struct fb_info *info);
static int retz3fb_ioctl(struct inode *inode, struct file *file,
			 unsigned int cmd, unsigned long arg, int con,
			 struct fb_info *info);


/*
 *    Interface to the low level console driver
 */

void retz3fb_init(void);
static int z3fb_switch(int con, struct fb_info *info);
static int z3fb_updatevar(int con, struct fb_info *info);
static void z3fb_blank(int blank, struct fb_info *info);


/*
 *    Text console acceleration
 */

#ifdef FBCON_HAS_CFB8
static struct display_switch fbcon_retz3_8;
#endif


/*
 *    Accelerated Functions used by the low level console driver
 */

static void retz3_bitblt(struct fb_var_screeninfo *scr,
			 unsigned short curx, unsigned short cury, unsigned
			 short destx, unsigned short desty, unsigned short
			 width, unsigned short height, unsigned short cmd,
			 unsigned short mask);

/*
 *   Hardware Specific Routines
 */

static int retz3_init(void);
static int retz3_encode_fix(struct fb_fix_screeninfo *fix,
                          struct retz3fb_par *par);
static int retz3_decode_var(struct fb_var_screeninfo *var,
                          struct retz3fb_par *par);
static int retz3_encode_var(struct fb_var_screeninfo *var,
                          struct retz3fb_par *par);
static int retz3_getcolreg(unsigned int regno, unsigned int *red,
			   unsigned int *green, unsigned int *blue,
			   unsigned int *transp, struct fb_info *info);
static int retz3_setcolreg(unsigned int regno, unsigned int red,
			   unsigned int green, unsigned int blue,
			   unsigned int transp, struct fb_info *info);
static void retz3_blank(int blank);


/*
 *    Internal routines
 */

static void retz3fb_get_par(struct retz3fb_par *par);
static void retz3fb_set_par(struct retz3fb_par *par);
static int do_fb_set_var(struct fb_var_screeninfo *var, int isactive);
static void do_install_cmap(int con, struct fb_info *info);
static void retz3fb_set_disp(int con, struct fb_info *info);
static int get_video_mode(const char *name);


/* -------------------- Hardware specific routines -------------------------- */

static unsigned short find_fq(unsigned int freq)
{
	unsigned long f;
	long tmp;
	long prev = 0x7fffffff;
	long n2, n1 = 3;
	unsigned long m;
	unsigned short res = 0;

	if (freq <= 31250000)
		n2 = 3;
	else if (freq <= 62500000)
		n2 = 2;
	else if (freq <= 125000000)
		n2 = 1;
	else if (freq <= 250000000)
		n2 = 0;
	else
		return 0;


	do {
		f = freq >> (10 - n2);

		m = (f * n1) / (14318180/1024);

		if (m > 129)
			break;

		tmp =  (((m * 14318180) >> n2) / n1) - freq;
		if (tmp < 0)
			tmp = -tmp;

		if (tmp < prev) {
			prev = tmp;
			res = (((n2 << 5) | (n1-2)) << 8) | (m-2);
		}

	} while ( (++n1) <= 21);

	return res;
}


static int retz3_set_video(struct fb_var_screeninfo *var,
			   struct retz3fb_par *par)
{
#if 0
	float freq_f;
#endif
	unsigned int freq;

	int xres, hfront, hsync, hback;
	int yres, vfront, vsync, vback;
	unsigned char tmp;
	unsigned short best_freq;
	struct display_data data;

	short clocksel = 0; /* Apparantly this is always zero */

	int bpp = var->bits_per_pixel;

	/*
	 * XXX
	 */
	if (bpp == 24)
		return 0;

	if ((bpp != 8) && (bpp != 16) && (bpp != 24))
		return -EFAULT;

	par->xoffset = 0;
	par->yoffset = 0;

	xres   = var->xres * bpp / 4;
	hfront = var->right_margin * bpp / 4;
	hsync  = var->hsync_len * bpp / 4;
	hback  = var->left_margin * bpp / 4;

	if (var->vmode & FB_VMODE_DOUBLE)
	{
		yres = var->yres * 2;
		vfront = var->lower_margin * 2;
		vsync  = var->vsync_len * 2;
		vback  = var->upper_margin * 2;
	}
	else if (var->vmode & FB_VMODE_INTERLACED)
	{
		yres   = (var->yres + 1) / 2;
		vfront = (var->lower_margin + 1) / 2;
		vsync  = (var->vsync_len + 1) / 2;
		vback  = (var->upper_margin + 1) / 2;
	}
	else
	{
		yres   = var->yres; /* -1 ? */
		vfront = var->lower_margin;
		vsync  = var->vsync_len;
		vback  = var->upper_margin;
	}

	data.h_total	= (hback / 8) + (xres / 8)
			+ (hfront / 8) + (hsync / 8) - 1 /* + 1 */;
	data.h_dispend	= ((xres + bpp - 1)/ 8) - 1;
	data.h_bstart	= xres / 8 /* + 1 */;

	data.h_bstop	= data.h_total+1 + 2 + 1;
	data.h_sstart	= (xres / 8) + (hfront / 8) + 1;
	data.h_sstop	= (xres / 8) + (hfront / 8) + (hsync / 8) + 1;

	data.v_total	= yres + vfront + vsync + vback - 1;

	data.v_dispend	= yres - 1;
	data.v_bstart	= yres;

	data.v_bstop	= data.v_total;
	data.v_sstart	= yres + vfront - 1 - 2;
	data.v_sstop	= yres + vfront + vsync - 1;

#if 0 /* testing */

	printk("HBS: %i\n", data.h_bstart);
	printk("HSS: %i\n", data.h_sstart);
	printk("HSE: %i\n", data.h_sstop);
	printk("HBE: %i\n", data.h_bstop);
	printk("HT: %i\n", data.h_total);

	printk("hsync: %i\n", hsync);
	printk("hfront: %i\n", hfront);
	printk("hback: %i\n", hback);

	printk("VBS: %i\n", data.v_bstart);
	printk("VSS: %i\n", data.v_sstart);
	printk("VSE: %i\n", data.v_sstop);
	printk("VBE: %i\n", data.v_bstop);
	printk("VT: %i\n", data.v_total);

	printk("vsync: %i\n", vsync);
	printk("vfront: %i\n", vfront);
	printk("vback: %i\n", vback);
#endif

	if (data.v_total >= 1024)
		printk("MAYDAY: v_total >= 1024; bailing out!\n");

	reg_w(GREG_MISC_OUTPUT_W, 0xe3 | ((clocksel & 3) * 0x04));
	reg_w(GREG_FEATURE_CONTROL_W, 0x00);

	seq_w(SEQ_RESET, 0x00);
	seq_w(SEQ_RESET, 0x03);	/* reset sequencer logic */

	/*
	 * CLOCKING_MODE bits:
	 * 2: This one is only set for certain text-modes, wonder if
	 *    it may be for EGA-lines? (it was referred to as CLKDIV2)
	 * (The CL drivers sets it to 0x21 with the comment:
	 *  FullBandwidth (video off) and 8/9 dot clock)
	 */
	seq_w(SEQ_CLOCKING_MODE, 0x01 | 0x00 /* 0x08 */);

	seq_w(SEQ_MAP_MASK, 0x0f);        /* enable writing to plane 0-3 */
	seq_w(SEQ_CHAR_MAP_SELECT, 0x00); /* doesn't matter in gfx-mode */
	seq_w(SEQ_MEMORY_MODE, 0x06); /* CL driver says 0x0e for 256 col mode*/
	seq_w(SEQ_RESET, 0x01);
	seq_w(SEQ_RESET, 0x03);

	seq_w(SEQ_EXTENDED_ENABLE, 0x05);

	seq_w(SEQ_CURSOR_CONTROL, 0x00);	/* disable cursor */
	seq_w(SEQ_PRIM_HOST_OFF_HI, 0x00);
	seq_w(SEQ_PRIM_HOST_OFF_HI, 0x00);
	seq_w(SEQ_LINEAR_0, 0x4a);
	seq_w(SEQ_LINEAR_1, 0x00);

	seq_w(SEQ_SEC_HOST_OFF_HI, 0x00);
	seq_w(SEQ_SEC_HOST_OFF_LO, 0x00);
	seq_w(SEQ_EXTENDED_MEM_ENA, 0x3 | 0x4 | 0x10 | 0x40);

	/*
	 * The lower 4 bits (0-3) are used to set the font-width for
	 * text-mode - DON'T try to set this for gfx-mode.
	 */
	seq_w(SEQ_EXT_CLOCK_MODE, 0x10);
	seq_w(SEQ_EXT_VIDEO_ADDR, 0x03);

	/*
	 * Extended Pixel Control:
	 * bit 0:   text-mode=0, gfx-mode=1 (Graphics Byte ?)
	 * bit 1: (Packed/Nibble Pixel Format ?)
	 * bit 4-5: depth, 0=1-8bpp, 1=9-16bpp, 2=17-24bpp
	 */
	seq_w(SEQ_EXT_PIXEL_CNTL, 0x01 | (((bpp / 8) - 1) << 4));

	seq_w(SEQ_BUS_WIDTH_FEEDB, 0x04);
	seq_w(SEQ_COLOR_EXP_WFG, 0x01);
	seq_w(SEQ_COLOR_EXP_WBG, 0x00);
	seq_w(SEQ_EXT_RW_CONTROL, 0x00);
	seq_w(SEQ_MISC_FEATURE_SEL, (0x51 | (clocksel & 8)));
	seq_w(SEQ_COLOR_KEY_CNTL, 0x40);
	seq_w(SEQ_COLOR_KEY_MATCH0, 0x00);
	seq_w(SEQ_COLOR_KEY_MATCH1, 0x00);
	seq_w(SEQ_COLOR_KEY_MATCH2, 0x00);
	seq_w(SEQ_CRC_CONTROL, 0x00);
	seq_w(SEQ_PERF_SELECT, 0x10);
	seq_w(SEQ_ACM_APERTURE_1, 0x00);
	seq_w(SEQ_ACM_APERTURE_2, 0x30);
	seq_w(SEQ_ACM_APERTURE_3, 0x00);
	seq_w(SEQ_MEMORY_MAP_CNTL, 0x03);


	/* unlock register CRT0..CRT7 */
	crt_w(CRT_END_VER_RETR, (data.v_sstop & 0x0f) | 0x20);

	/* Zuerst zu schreibende Werte nur per printk ausgeben */
	DEBUG printk("CRT_HOR_TOTAL: %ld\n", data.h_total);
	crt_w(CRT_HOR_TOTAL, data.h_total & 0xff);

	DEBUG printk("CRT_HOR_DISP_ENA_END: %ld\n", data.h_dispend);
	crt_w(CRT_HOR_DISP_ENA_END, (data.h_dispend) & 0xff);

	DEBUG printk("CRT_START_HOR_BLANK: %ld\n", data.h_bstart);
	crt_w(CRT_START_HOR_BLANK, data.h_bstart & 0xff);

	DEBUG printk("CRT_END_HOR_BLANK: 128+%ld\n", data.h_bstop % 32);
	crt_w(CRT_END_HOR_BLANK,  0x80 | (data.h_bstop & 0x1f));

	DEBUG printk("CRT_START_HOR_RETR: %ld\n", data.h_sstart);
	crt_w(CRT_START_HOR_RETR, data.h_sstart & 0xff);

	tmp = (data.h_sstop & 0x1f);
	if (data.h_bstop & 0x20)
		tmp |= 0x80;
	DEBUG printk("CRT_END_HOR_RETR: %d\n", tmp);
	crt_w(CRT_END_HOR_RETR, tmp);

	DEBUG printk("CRT_VER_TOTAL: %ld\n", data.v_total & 0xff);
	crt_w(CRT_VER_TOTAL, (data.v_total & 0xff));

	tmp = 0x10;  /* LineCompare bit #9 */
	if (data.v_total & 256)
		tmp |= 0x01;
	if (data.v_dispend & 256)
		tmp |= 0x02;
	if (data.v_sstart & 256)
		tmp |= 0x04;
	if (data.v_bstart & 256)
		tmp |= 0x08;
	if (data.v_total & 512)
		tmp |= 0x20;
	if (data.v_dispend & 512)
		tmp |= 0x40;
	if (data.v_sstart & 512)
		tmp |= 0x80;
	DEBUG printk("CRT_OVERFLOW: %d\n", tmp);
	crt_w(CRT_OVERFLOW, tmp);

	crt_w(CRT_PRESET_ROW_SCAN, 0x00); /* not CL !!! */

	tmp = 0x40; /* LineCompare bit #8 */
	if (data.v_bstart & 512)
		tmp |= 0x20;
	if (var->vmode & FB_VMODE_DOUBLE)
		tmp |= 0x80;
 	DEBUG printk("CRT_MAX_SCAN_LINE: %d\n", tmp);
	crt_w(CRT_MAX_SCAN_LINE, tmp);

	crt_w(CRT_CURSOR_START, 0x00);
	crt_w(CRT_CURSOR_END, 8 & 0x1f); /* font height */

	crt_w(CRT_START_ADDR_HIGH, 0x00);
	crt_w(CRT_START_ADDR_LOW, 0x00);

	crt_w(CRT_CURSOR_LOC_HIGH, 0x00);
	crt_w(CRT_CURSOR_LOC_LOW, 0x00);

 	DEBUG printk("CRT_START_VER_RETR: %ld\n", data.v_sstart & 0xff);
	crt_w(CRT_START_VER_RETR, (data.v_sstart & 0xff));

#if 1
	/* 5 refresh cycles per scanline */
	DEBUG printk("CRT_END_VER_RETR: 64+32+%ld\n", data.v_sstop % 16);
	crt_w(CRT_END_VER_RETR, ((data.v_sstop & 0x0f) | 0x40 | 0x20));
#else
	DEBUG printk("CRT_END_VER_RETR: 128+32+%ld\n", data.v_sstop % 16);
	crt_w(CRT_END_VER_RETR, ((data.v_sstop & 0x0f) | 128 | 32));
#endif
	DEBUG printk("CRT_VER_DISP_ENA_END: %ld\n", data.v_dispend & 0xff);
	crt_w(CRT_VER_DISP_ENA_END, (data.v_dispend & 0xff));

	DEBUG printk("CRT_START_VER_BLANK: %ld\n", data.v_bstart & 0xff);
	crt_w(CRT_START_VER_BLANK, (data.v_bstart & 0xff));

	DEBUG printk("CRT_END_VER_BLANK: %ld\n", data.v_bstop & 0xff);
	crt_w(CRT_END_VER_BLANK, (data.v_bstop & 0xff));

	DEBUG printk("CRT_MODE_CONTROL: 0xe3\n");
	crt_w(CRT_MODE_CONTROL, 0xe3);

	DEBUG printk("CRT_LINE_COMPARE: 0xff\n");
	crt_w(CRT_LINE_COMPARE, 0xff);

	tmp = (var->xres_virtual / 8) * (bpp / 8);
	crt_w(CRT_OFFSET, tmp);

	crt_w(CRT_UNDERLINE_LOC, 0x07); /* probably font-height - 1 */

	tmp = 0x20;			/* Enable extended end bits */
	if (data.h_total & 0x100)
		tmp |= 0x01;
	if ((data.h_dispend) & 0x100)
		tmp |= 0x02;
	if (data.h_bstart & 0x100)
		tmp |= 0x04;
	if (data.h_sstart & 0x100)
		tmp |= 0x08;
	if (var->vmode & FB_VMODE_INTERLACED)
		tmp |= 0x10;
 	DEBUG printk("CRT_EXT_HOR_TIMING1: %d\n", tmp);
	crt_w(CRT_EXT_HOR_TIMING1, tmp);

	tmp = 0x00;
	if (((var->xres_virtual / 8) * (bpp / 8)) & 0x100)
		tmp |= 0x10;
	crt_w(CRT_EXT_START_ADDR, tmp);

	tmp = 0x00;
	if (data.h_total & 0x200)
		tmp |= 0x01;
	if ((data.h_dispend) & 0x200)
		tmp |= 0x02;
	if (data.h_bstart & 0x200)
		tmp |= 0x04;
	if (data.h_sstart & 0x200)
		tmp |= 0x08;
	tmp |= ((data.h_bstop & 0xc0) >> 2);
	tmp |= ((data.h_sstop & 0x60) << 1);
	crt_w(CRT_EXT_HOR_TIMING2, tmp);
 	DEBUG printk("CRT_EXT_HOR_TIMING2: %d\n", tmp);

	tmp = 0x10;			/* Line compare bit 10 */
	if (data.v_total & 0x400)
		tmp |= 0x01;
	if ((data.v_dispend) & 0x400)
		tmp |= 0x02;
	if (data.v_bstart & 0x400)
		tmp |= 0x04;
	if (data.v_sstart & 0x400)
		tmp |= 0x08;
	tmp |= ((data.v_bstop & 0x300) >> 3);
	if (data.v_sstop & 0x10)
		tmp |= 0x80;
	crt_w(CRT_EXT_VER_TIMING, tmp);
 	DEBUG printk("CRT_EXT_VER_TIMING: %d\n", tmp);

	crt_w(CRT_MONITOR_POWER, 0x00);

	/*
	 * Convert from ps to Hz.
	 */
#if 0
	freq_f = (1.0/(float)var->pixclock) * 1000000000;
	freq = ((unsigned int)freq_f) * 1000;
#else
	freq = 2000000000 / var->pixclock;
	freq = freq * 500;
#endif

	best_freq = find_fq(freq);
	pll_w(0x02, best_freq);
	best_freq = find_fq(61000000);
	pll_w(0x0a, best_freq);
	pll_w(0x0e, 0x22);

	gfx_w(GFX_SET_RESET, 0x00);
	gfx_w(GFX_ENABLE_SET_RESET, 0x00);
	gfx_w(GFX_COLOR_COMPARE, 0x00);
	gfx_w(GFX_DATA_ROTATE, 0x00);
	gfx_w(GFX_READ_MAP_SELECT, 0x00);
	gfx_w(GFX_GRAPHICS_MODE, 0x00);
	gfx_w(GFX_MISC, 0x05);
	gfx_w(GFX_COLOR_XCARE, 0x0f);
	gfx_w(GFX_BITMASK, 0xff);

	reg_r(ACT_ADDRESS_RESET);
	attr_w(ACT_PALETTE0 , 0x00);
	attr_w(ACT_PALETTE1 , 0x01);
	attr_w(ACT_PALETTE2 , 0x02);
	attr_w(ACT_PALETTE3 , 0x03);
	attr_w(ACT_PALETTE4 , 0x04);
	attr_w(ACT_PALETTE5 , 0x05);
	attr_w(ACT_PALETTE6 , 0x06);
	attr_w(ACT_PALETTE7 , 0x07);
	attr_w(ACT_PALETTE8 , 0x08);
	attr_w(ACT_PALETTE9 , 0x09);
	attr_w(ACT_PALETTE10, 0x0a);
	attr_w(ACT_PALETTE11, 0x0b);
	attr_w(ACT_PALETTE12, 0x0c);
	attr_w(ACT_PALETTE13, 0x0d);
	attr_w(ACT_PALETTE14, 0x0e);
	attr_w(ACT_PALETTE15, 0x0f);
	reg_r(ACT_ADDRESS_RESET);

	attr_w(ACT_ATTR_MODE_CNTL, 0x09); /* 0x01 for CL */

	attr_w(ACT_OVERSCAN_COLOR, 0x00);
	attr_w(ACT_COLOR_PLANE_ENA, 0x0f);
	attr_w(ACT_HOR_PEL_PANNING, 0x00);
	attr_w(ACT_COLOR_SELECT, 0x00);

	reg_r(ACT_ADDRESS_RESET);
	reg_w(ACT_DATA, 0x20);

	reg_w(VDAC_MASK, 0xff);

	/*
	 * Extended palette adressing ???
	 */
	switch (bpp){
	case 8:
		reg_w(0x83c6, 0x00);
		break;
	case 16:
		reg_w(0x83c6, 0x60);
		break;
	case 24:
		reg_w(0x83c6, 0xe0);
		break;
	default:
		printk("Illegal color-depth: %i\n", bpp);
	}

	reg_w(VDAC_ADDRESS, 0x00);

	seq_w(SEQ_MAP_MASK, 0x0f );

	return 0;
}

/*
 *    Initialization
 *
 *    Set the default video mode for this chipset. If a video mode was
 *    specified on the command line, it will override the default mode.
 */

static int retz3_init(void)
{
	short i;
#if 0
	volatile unsigned long *CursorBase;
#endif

	for (i = 0; i < 256; i++){
		for (i = 0; i < 256; i++){
			retz3_color_table [i][0] = i;
			retz3_color_table [i][1] = i;
			retz3_color_table [i][2] = i;
		}
	}

	/* Disable hardware cursor */

	seq_w(SEQ_CURSOR_Y_INDEX, 0x00);

#if 0
	/* Initialize hardware cursor */
	CursorBase = (unsigned long *)((char *)(z3_mem) + z3_size - 0x400);
	for (i=0; i < 8; i++){
		*(CursorBase  +(i*4)) = 0xffffff00;
		*(CursorBase+1+(i*4)) = 0xffff0000;
		*(CursorBase+2+(i*4)) = 0xffff0000;
		*(CursorBase+3+(i*4)) = 0xffff0000;
	}
	for (i=8; i < 64; i++){
		*(CursorBase  +(i*4)) = 0xffff0000;
		*(CursorBase+1+(i*4)) = 0xffff0000;
		*(CursorBase+2+(i*4)) = 0xffff0000;
		*(CursorBase+3+(i*4)) = 0xffff0000;
	}
#endif

	retz3_setcolreg (255, 56<<8, 100<<8, 160<<8, 0, NULL /* unused */);
	retz3_setcolreg (254, 0, 0, 0, 0, NULL /* unused */);

	return 0;
}


/*
 *    This function should fill in the `fix' structure based on the
 *    values in the `par' structure.
 */

static int retz3_encode_fix(struct fb_fix_screeninfo *fix,
			    struct retz3fb_par *par)
{
	memset(fix, 0, sizeof(struct fb_fix_screeninfo));
	strcpy(fix->id, retz3fb_name);
	fix->smem_start = (char *)z3_fbmem;
	fix->smem_len = z3_size;
	fix->mmio_start = (char *)z3_regs;
	fix->mmio_len = 0x00c00000;

	fix->type = FB_TYPE_PACKED_PIXELS;
	fix->type_aux = 0;
	if (par->bpp == 8)
		fix->visual = FB_VISUAL_PSEUDOCOLOR;
	else
		fix->visual = FB_VISUAL_TRUECOLOR;

	fix->xpanstep = 0;
	fix->ypanstep = 0;
	fix->ywrapstep = 0;
	fix->line_length = 0;

	fix->accel = FB_ACCEL_NCR_77C32BLT;

	return 0;
}


/*
 *    Get the video params out of `var'. If a value doesn't fit, round
 *    it up, if it's too big, return -EINVAL.
 */

static int retz3_decode_var(struct fb_var_screeninfo *var,
			    struct retz3fb_par *par)
{
	par->xres = var->xres;
	par->yres = var->yres;
	par->xres_vir = var->xres_virtual;
	par->yres_vir = var->yres_virtual;
	par->bpp = var->bits_per_pixel;
	par->pixclock = var->pixclock;
	par->vmode = var->vmode;

	par->red = var->red;
	par->green = var->green;
	par->blue = var->blue;
	par->transp = var->transp;

	par->left_margin = var->left_margin;
	par->right_margin = var->right_margin;
	par->upper_margin = var->upper_margin;
	par->lower_margin = var->lower_margin;
	par->hsync_len = var->hsync_len;
	par->vsync_len = var->vsync_len;

	if (var->accel_flags & FB_ACCELF_TEXT)
	    par->accel = FB_ACCELF_TEXT;
	else
	    par->accel = 0;

	return 0;
}


/*
 *    Fill the `var' structure based on the values in `par' and maybe
 *    other values read out of the hardware.
 */

static int retz3_encode_var(struct fb_var_screeninfo *var,
			    struct retz3fb_par *par)
{
	memset(var, 0, sizeof(struct fb_var_screeninfo));
	var->xres = par->xres;
	var->yres = par->yres;
	var->xres_virtual = par->xres_vir;
	var->yres_virtual = par->yres_vir;
	var->xoffset = 0;
	var->yoffset = 0;

	var->bits_per_pixel = par->bpp;
	var->grayscale = 0;

	var->red = par->red;
	var->green = par->green;
	var->blue = par->blue;
	var->transp = par->transp;

	var->nonstd = 0;
	var->activate = 0;

	var->height = -1;
	var->width = -1;

	var->accel_flags = (par->accel && par->bpp == 8) ? FB_ACCELF_TEXT : 0;

	var->pixclock = par->pixclock;

	var->sync = 0;				/* ??? */
	var->left_margin = par->left_margin;
	var->right_margin = par->right_margin;
	var->upper_margin = par->upper_margin;
	var->lower_margin = par->lower_margin;
	var->hsync_len = par->hsync_len;
	var->vsync_len = par->vsync_len;

	var->vmode = par->vmode;
	return 0;
}


/*
 *    Set a single color register. Return != 0 for invalid regno.
 */

static int retz3_setcolreg(unsigned int regno, unsigned int red,
			   unsigned int green, unsigned int blue,
			   unsigned int transp, struct fb_info *info)
{
	/* We'll get to this */

	if (regno > 255)
		return 1;

	red >>= 10;
	green >>= 10;
	blue >>= 10;

	retz3_color_table [regno][0] = red;
	retz3_color_table [regno][1] = green;
	retz3_color_table [regno][2] = blue;

	reg_w(VDAC_ADDRESS_W, regno);
	reg_w(VDAC_DATA, red);
	reg_w(VDAC_DATA, green);
	reg_w(VDAC_DATA, blue);

	return 0;
}


/*
 *    Read a single color register and split it into
 *    colors/transparent. Return != 0 for invalid regno.
 */

static int retz3_getcolreg(unsigned int regno, unsigned int *red,
			   unsigned int *green, unsigned int *blue,
			   unsigned int *transp, struct fb_info *info)
{
	int t;

	if (regno > 255)
		return 1;
	t       = retz3_color_table [regno][0];
	*red    = (t<<10) | (t<<4) | (t>>2);
	t       = retz3_color_table [regno][1];
	*green  = (t<<10) | (t<<4) | (t>>2);
	t       = retz3_color_table [regno][2];
	*blue   = (t<<10) | (t<<4) | (t>>2);
	*transp = 0;
	return 0;
}


/*
 *    (Un)Blank the screen
 */

void retz3_blank(int blank)
{
	short i;

	if (blank)
		for (i = 0; i < 256; i++){
			reg_w(VDAC_ADDRESS_W, i);
			reg_w(VDAC_DATA, 0);
			reg_w(VDAC_DATA, 0);
			reg_w(VDAC_DATA, 0);
		}
	else
		for (i = 0; i < 256; i++){
			reg_w(VDAC_ADDRESS_W, i);
			reg_w(VDAC_DATA, retz3_color_table [i][0]);
			reg_w(VDAC_DATA, retz3_color_table [i][1]);
			reg_w(VDAC_DATA, retz3_color_table [i][2]);
		}
}


static void retz3_bitblt (struct fb_var_screeninfo *var,
			  unsigned short srcx, unsigned short srcy,
			  unsigned short destx, unsigned short desty,
			  unsigned short width, unsigned short height,
			  unsigned short cmd, unsigned short mask)
{

	volatile unsigned long *acm = (unsigned long *) (z3_mem + ACM_OFFSET);
	unsigned long *pattern = (unsigned long *)(z3_fbmem + PAT_MEM_OFF);

	unsigned short mod;
	unsigned long tmp;
	unsigned long pat, src, dst;
	unsigned char blt_status;

	int i, xres_virtual = var->xres_virtual;
	short bpp = (var->bits_per_pixel & 0xff);

	if (bpp < 8)
		bpp = 8;

	tmp = mask | (mask << 16);

#if 0
	/*
	 * Check for blitter finished before we start messing with the
	 * pattern.
	 */
	do{
		blt_status = *(((volatile unsigned char *)acm) +
			       (ACM_START_STATUS + 2));
	}while ((blt_status & 1) == 0);
#endif

	i = 0;
	do{
		*pattern++ = tmp;
	}while(i++ < bpp/4);

	tmp = cmd << 8;
	*(acm + ACM_RASTEROP_ROTATION/4) = tmp;

	mod = 0xc0c2;

	pat = 8 * PAT_MEM_OFF;
	dst = bpp * (destx + desty * xres_virtual);

	/*
	 * Source is not set for clear.
	 */
	if ((cmd != Z3BLTclear) && (cmd != Z3BLTset)) {
		src = bpp * (srcx + srcy * xres_virtual);

		if (destx > srcx) {
			mod &= ~0x8000;
			src += bpp * (width - 1);
			dst += bpp * (width - 1);
			pat += bpp * 2;
		}
		if (desty > srcy) {
			mod &= ~0x4000;
			src += bpp * (height - 1) * xres_virtual;
			dst += bpp * (height - 1) * xres_virtual;
			pat += bpp * 4;
		}

		*(acm + ACM_SOURCE/4) = cpu_to_le32(src);
	}

	*(acm + ACM_PATTERN/4) = cpu_to_le32(pat);

	*(acm + ACM_DESTINATION/4) = cpu_to_le32(dst);

	tmp = mod << 16;
	*(acm + ACM_CONTROL/4) = tmp;

	tmp  = width | (height << 16);

	*(acm + ACM_BITMAP_DIMENSION/4) = cpu_to_le32(tmp);

	*(((volatile unsigned char *)acm) + ACM_START_STATUS) = 0x00;
	*(((volatile unsigned char *)acm) + ACM_START_STATUS) = 0x01;

	/*
	 * No reason to wait for the blitter to finish, it is better
	 * just to check if it has finished before we use it again.
	 */
#if 1
#if 0
	while ((*(((volatile unsigned char *)acm) +
		  (ACM_START_STATUS + 2)) & 1) == 0);
#else
	do{
		blt_status = *(((volatile unsigned char *)acm) +
			       (ACM_START_STATUS + 2));
	}
	while ((blt_status & 1) == 0);
#endif
#endif
}

#if 0
/*
 * Move cursor to x, y
 */
static void retz3_MoveCursor (unsigned short x, unsigned short y)
{
	/* Guess we gotta deal with the cursor at some point */
}
#endif

/* -------------------- Interfaces to hardware functions -------------------- */


static struct fb_hwswitch retz3_switch = {
	retz3_init, retz3_encode_fix, retz3_decode_var, retz3_encode_var,
	retz3_getcolreg, retz3_setcolreg, retz3_blank
};


/* -------------------- Generic routines ------------------------------------ */


/*
 *    Fill the hardware's `par' structure.
 */

static void retz3fb_get_par(struct retz3fb_par *par)
{
	if (current_par_valid)
		*par = current_par;
	else
		fbhw->decode_var(&retz3fb_default, par);
}


static void retz3fb_set_par(struct retz3fb_par *par)
{
	current_par = *par;
	current_par_valid = 1;
}


static int do_fb_set_var(struct fb_var_screeninfo *var, int isactive)
{
	int err, activate;
	struct retz3fb_par par;

	if ((err = fbhw->decode_var(var, &par)))
		return err;
	activate = var->activate;

	/* XXX ... what to do about isactive ? */

	if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW && isactive)
		retz3fb_set_par(&par);
	fbhw->encode_var(var, &par);
	var->activate = activate;

	retz3_set_video(var, &current_par);

	return 0;
}


static void do_install_cmap(int con, struct fb_info *info)
{
	if (con != currcon)
		return;
	if (fb_display[con].cmap.len)
		fb_set_cmap(&fb_display[con].cmap, 1, fbhw->setcolreg, info);
	else
		fb_set_cmap(fb_default_cmap(1<<fb_display[con].var.bits_per_pixel),
					    1, fbhw->setcolreg, info);
}


/*
 *    Open/Release the frame buffer device
 */

static int retz3fb_open(struct fb_info *info, int user)
{
	/*
	 * Nothing, only a usage count for the moment
	 */

	MOD_INC_USE_COUNT;
	return 0;
}

static int retz3fb_release(struct fb_info *info, int user)
{
	MOD_DEC_USE_COUNT;
	return 0;
}


/*
 *    Get the Fixed Part of the Display
 */

static int retz3fb_get_fix(struct fb_fix_screeninfo *fix, int con,
			   struct fb_info *info)
{
	struct retz3fb_par par;
	int error = 0;

	if (con == -1)
		retz3fb_get_par(&par);
	else
		error = fbhw->decode_var(&fb_display[con].var, &par);
	return(error ? error : fbhw->encode_fix(fix, &par));
}


/*
 *    Get the User Defined Part of the Display
 */

static int retz3fb_get_var(struct fb_var_screeninfo *var, int con,
			   struct fb_info *info)
{
	struct retz3fb_par par;
	int error = 0;

	if (con == -1) {
		retz3fb_get_par(&par);
		error = fbhw->encode_var(var, &par);
	} else
		*var = fb_display[con].var;
	return error;
}


#if 1
static void retz3fb_set_disp(int con, struct fb_info *info)
{
	struct fb_fix_screeninfo fix;
	struct display *display;

	if (con >= 0)
		display = &fb_display[con];
	else
		display = &disp;	/* used during initialization */

	retz3fb_get_fix(&fix, con, info);

	if (con == -1)
		con = 0;

	display->screen_base = fix.smem_start;
	display->visual = fix.visual;
	display->type = fix.type;
	display->type_aux = fix.type_aux;
	display->ypanstep = fix.ypanstep;
	display->ywrapstep = fix.ywrapstep;
	display->can_soft_blank = 1;
	display->inverse = z3fb_inverse;

	/*
	 * This seems to be about 20% faster.
	 */
	display->scrollmode = SCROLL_YREDRAW;

	switch (display->var.bits_per_pixel) {
#ifdef FBCON_HAS_CFB8
	case 8:
		if (display->var.accel_flags & FB_ACCELF_TEXT) {
		    display->dispsw = &fbcon_retz3_8;
#warning FIXME: We should reinit the graphics engine here
		} else
		    display->dispsw = &fbcon_cfb8;
		break;
#endif
#ifdef FBCON_HAS_CFB16
	case 16:
		display->dispsw = &fbcon_cfb16;
		break;
#endif
	default:
		display->dispsw = &fbcon_dummy;
		break;
	}
}
#endif

/*
 *    Set the User Defined Part of the Display
 */

static int retz3fb_set_var(struct fb_var_screeninfo *var, int con,
			   struct fb_info *info)
{
	int err, oldxres, oldyres, oldvxres, oldvyres, oldbpp, oldaccel;
	struct display *display;

	if (con >= 0)
		display = &fb_display[con];
	else
		display = &disp;	/* used during initialization */

#if 0
	if (con == -1)
		con = 0;
#endif

	if ((err = do_fb_set_var(var, con == currcon)))
		return err;
	if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
		oldxres = display->var.xres;
		oldyres = display->var.yres;
		oldvxres = display->var.xres_virtual;
		oldvyres = display->var.yres_virtual;
		oldbpp = display->var.bits_per_pixel;
		oldaccel = display->var.accel_flags;
		display->var = *var;

		if (oldxres != var->xres || oldyres != var->yres ||
		    oldvxres != var->xres_virtual ||
		    oldvyres != var->yres_virtual ||
		    oldbpp != var->bits_per_pixel ||
		    oldaccel != var->accel_flags) {

			struct fb_fix_screeninfo fix;
			retz3fb_get_fix(&fix, con, info);

			display->screen_base = fix.smem_start;
			display->visual = fix.visual;
			display->type = fix.type;
			display->type_aux = fix.type_aux;
			display->ypanstep = fix.ypanstep;
			display->ywrapstep = fix.ywrapstep;
			display->line_length = fix.line_length;
			display->can_soft_blank = 1;
			display->inverse = z3fb_inverse;
			switch (display->var.bits_per_pixel) {
#ifdef FBCON_HAS_CFB8
			case 8:
				if (var->accel_flags & FB_ACCELF_TEXT) {
					display->dispsw = &fbcon_retz3_8;
#warning FIXME: We should reinit the graphics engine here
				} else
					display->dispsw = &fbcon_cfb8;
				break;
#endif
#ifdef FBCON_HAS_CFB16
			case 16:
				display->dispsw = &fbcon_cfb16;
				break;
#endif
			default:
				display->dispsw = &fbcon_dummy;
				break;
			}
/*
	retz3fb_set_disp(con, info);
*/
			if (fb_info.changevar)
				(*fb_info.changevar)(con);
		}

		if (oldbpp != var->bits_per_pixel) {
			if ((err = fb_alloc_cmap(&display->cmap, 0, 0)))
				return err;
			do_install_cmap(con, info);
		}
	}
	return 0;
}


/*
 *    Get the Colormap
 */

static int retz3fb_get_cmap(struct fb_cmap *cmap, int kspc, int con,
			    struct fb_info *info)
{
	if (con == currcon) /* current console? */
		return(fb_get_cmap(cmap, kspc, fbhw->getcolreg, info));
	else if (fb_display[con].cmap.len) /* non default colormap? */
		fb_copy_cmap(&fb_display[con].cmap, cmap, kspc ? 0 : 2);
	else
		fb_copy_cmap(fb_default_cmap(1<<fb_display[con].var.bits_per_pixel),
			     cmap, kspc ? 0 : 2);
	return 0;
}


/*
 *    Set the Colormap
 */

static int retz3fb_set_cmap(struct fb_cmap *cmap, int kspc, int con,
			    struct fb_info *info)
{
	int err;

	if (!fb_display[con].cmap.len) {       /* no colormap allocated? */
		if ((err = fb_alloc_cmap(&fb_display[con].cmap,
					 1<<fb_display[con].var.bits_per_pixel,
					 0)))
			return err;
	}
	if (con == currcon)              /* current console? */
		return(fb_set_cmap(cmap, kspc, fbhw->setcolreg, info));
	else
		fb_copy_cmap(cmap, &fb_display[con].cmap, kspc ? 0 : 1);
	return 0;
}


/*
 *    Pan or Wrap the Display
 *
 *    This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag
 */

static int retz3fb_pan_display(struct fb_var_screeninfo *var, int con,
				struct fb_info *info)
{
	return -EINVAL;
}


/*
 *    RetinaZ3 Frame Buffer Specific ioctls
 */

static int retz3fb_ioctl(struct inode *inode, struct file *file,
                         unsigned int cmd, unsigned long arg, int con,
                         struct fb_info *info)
{
	return -EINVAL;
}


static struct fb_ops retz3fb_ops = {
	retz3fb_open, retz3fb_release, retz3fb_get_fix, retz3fb_get_var,
	retz3fb_set_var, retz3fb_get_cmap, retz3fb_set_cmap,
	retz3fb_pan_display, retz3fb_ioctl
};


__initfunc(void retz3fb_setup(char *options, int *ints))
{
	char *this_opt;

	fb_info.fontname[0] = '\0';

	if (!options || !*options)
		return;

	for (this_opt = strtok(options, ","); this_opt;
	     this_opt = strtok(NULL, ",")){
		if (!strcmp(this_opt, "inverse")) {
			z3fb_inverse = 1;
			fb_invert_cmaps();
		} else if (!strncmp(this_opt, "font:", 5))
			strcpy(fb_info.fontname, this_opt+5);
		else
			z3fb_mode = get_video_mode(this_opt);
	}
}


/*
 *    Initialization
 */

__initfunc(void retz3fb_init(void))
{
	unsigned long board_addr, board_size;
	unsigned int key;
	const struct ConfigDev *cd;

	struct retz3fb_par par;

	if (!(key = zorro_find(ZORRO_PROD_MACROSYSTEMS_RETINA_Z3, 0, 0)))
		return;

	cd = zorro_get_board (key);
	zorro_config_board (key, 0);
	board_addr = (unsigned long)cd->cd_BoardAddr;
	board_size = (unsigned long)cd->cd_BoardSize;

	z3_mem = kernel_map (board_addr, board_size,
			     KERNELMAP_NOCACHE_SER, NULL);

	z3_regs = (char*) z3_mem;
	z3_fbmem = z3_mem + VIDEO_MEM_OFFSET;

	/* Get memory size - for now we asume its a 4MB board */

	z3_size = 0x00400000; /* 4 MB */

	fbhw = &retz3_switch;

	fbhw->init();

	strcpy(fb_info.modename, retz3fb_name);
	fb_info.changevar = NULL;
	fb_info.node = -1;
	fb_info.fbops = &retz3fb_ops;
	fb_info.disp = &disp;
	fb_info.switch_con = &z3fb_switch;
	fb_info.updatevar = &z3fb_updatevar;
	fb_info.blank = &z3fb_blank;
	fb_info.flags = FBINFO_FLAG_DEFAULT;

	if (z3fb_mode == -1)
		retz3fb_default = retz3fb_predefined[0].var;

	fbhw->decode_var(&retz3fb_default, &par);
	fbhw->encode_var(&retz3fb_default, &par);

	do_fb_set_var(&retz3fb_default, 0);
	retz3fb_get_var(&disp.var, -1, &fb_info);

	retz3fb_set_disp(-1, &fb_info);

	do_install_cmap(0, &fb_info);

	if (register_framebuffer(&fb_info) < 0)
		return;

	printk("fb%d: %s frame buffer device, using %ldK of video memory\n",
	       GET_FB_IDX(fb_info.node), fb_info.modename, z3_size>>10);

	/* TODO: This driver cannot be unloaded yet */
	MOD_INC_USE_COUNT;
}


static int z3fb_switch(int con, struct fb_info *info)
{
	/* Do we have to save the colormap? */
	if (fb_display[currcon].cmap.len)
		fb_get_cmap(&fb_display[currcon].cmap, 1, fbhw->getcolreg,
			    info);

	do_fb_set_var(&fb_display[con].var, 1);
	currcon = con;
	/* Install new colormap */
	do_install_cmap(con, info);
	return 0;
}


/*
 *    Update the `var' structure (called by fbcon.c)
 *
 *    This call looks only at yoffset and the FB_VMODE_YWRAP flag in `var'.
 *    Since it's called by a kernel driver, no range checking is done.
 */

static int z3fb_updatevar(int con, struct fb_info *info)
{
	return 0;
}


/*
 *    Blank the display.
 */

static void z3fb_blank(int blank, struct fb_info *info)
{
	fbhw->blank(blank);
}


/*
 *    Get a Video Mode
 */

__initfunc(static int get_video_mode(const char *name))
{
	short i;

	for (i = 0; i <= NUM_TOTAL_MODES; i++)
		if (!strcmp(name, retz3fb_predefined[i].name)){
			retz3fb_default = retz3fb_predefined[i].var;
			return i;
		}
	return -1;
}


#ifdef MODULE
int init_module(void)
{
	retz3fb_init();
	return 0;
}

void cleanup_module(void)
{
	/*
	 * Not reached because the usecount will never
	 * be decremented to zero
	 */
	unregister_framebuffer(&fb_info);
	/* TODO: clean up ... */
}
#endif


/*
 *  Text console acceleration
 */

#ifdef FBCON_HAS_CFB8
static void fbcon_retz3_8_bmove(struct display *p, int sy, int sx, int dy, int dx,
	                int height, int width)
{
	int fontwidth = fontwidth(p);

	sx *= fontwidth;
	dx *= fontwidth;
	width *= fontwidth;

	retz3_bitblt(&p->var,
		     (unsigned short)sx,
		     (unsigned short)(sy*fontheight(p)),
		     (unsigned short)dx,
		     (unsigned short)(dy*fontheight(p)),
		     (unsigned short)width,
		     (unsigned short)(height*fontheight(p)),
		     Z3BLTcopy,
		     0xffff);
}

static void fbcon_retz3_8_clear(struct vc_data *conp, struct display *p, int
			sy, int sx, int height, int width)
{
	unsigned short col;
	int fontwidth = fontwidth(p);

	sx *= fontwidth;
	width *= fontwidth;

	col = attr_bgcol_ec(p, conp);
	col &= 0xff;
	col |= (col << 8);

	retz3_bitblt(&p->var,
		     (unsigned short)sx,
		     (unsigned short)(sy*fontheight(p)),
		     (unsigned short)sx,
		     (unsigned short)(sy*fontheight(p)),
		     (unsigned short)width,
		     (unsigned short)(height*fontheight(p)),
		     Z3BLTset,
		     col);
}

static struct display_switch fbcon_retz3_8 = {
    fbcon_cfb8_setup, fbcon_retz3_8_bmove, fbcon_retz3_8_clear,
    fbcon_cfb8_putc, fbcon_cfb8_putcs, fbcon_cfb8_revc, NULL, NULL,
    fbcon_cfb8_clear_margins, FONTWIDTH(8)
};
#endif