Loading...
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 | /* * linux/kernel/arch/arm/drivers/block/fd1772.c * Based on ataflop.c in the m68k Linux * Copyright (C) 1993 Greg Harp * Atari Support by Bjoern Brauel, Roman Hodek * Archimedes Support by Dave Gilbert (linux@treblig.org) * * Big cleanup Sep 11..14 1994 Roman Hodek: * - Driver now works interrupt driven * - Support for two drives; should work, but I cannot test that :-( * - Reading is done in whole tracks and buffered to speed up things * - Disk change detection and drive deselecting after motor-off * similar to TOS * - Autodetection of disk format (DD/HD); untested yet, because I * don't have an HD drive :-( * * Fixes Nov 13 1994 Martin Schaller: * - Autodetection works now * - Support for 5 1/4" disks * - Removed drive type (unknown on atari) * - Do seeks with 8 Mhz * * Changes by Andreas Schwab: * - After errors in multiple read mode try again reading single sectors * (Feb 1995): * - Clean up error handling * - Set blk_size for proper size checking * - Initialize track register when testing presence of floppy * - Implement some ioctl's * * Changes by Torsten Lang: * - When probing the floppies we should add the FDC1772CMDADD_H flag since * the FDC1772 will otherwise wait forever when no disk is inserted... * * Things left to do: * - Formatting * - Maybe a better strategy for disk change detection (does anyone * know one?) * - There are some strange problems left: The strangest one is * that, at least on my TT (4+4MB), the first 2 Bytes of the last * page of the TT-Ram (!) change their contents (some bits get * set) while a floppy DMA is going on. But there are no accesses * to these memory locations from the kernel... (I tested that by * making the page read-only). I cannot explain what's going on... * - Sometimes the drive-change-detection stops to work. The * function is still called, but the WP bit always reads as 0... * Maybe a problem with the status reg mode or a timing problem. * Note 10/12/94: The change detection now seems to work reliably. * There is no proof, but I've seen no hang for a long time... * * ARCHIMEDES changes: (gilbertd@cs.man.ac.uk) * 26/12/95 - Changed all names starting with FDC to FDC1772 * Removed all references to clock speed of FDC - we're stuck with 8MHz * Modified disk_type structure to remove HD formats * * 7/ 1/96 - Wrote FIQ code, removed most remaining atariisms * * 13/ 1/96 - Well I think its read a single sector; but there is a problem * fd_rwsec_done which is called in FIQ mode starts another transfer * off (in fd_rwsec) while still in FIQ mode. Because its still in * FIQ mode it can't service the DMA and loses data. So need to * heavily restructure. * 14/ 1/96 - Found that the definitions of the register numbers of the * FDC were multiplied by 2 in the header for the 16bit words * of the atari so half the writes were going in the wrong place. * Also realised that the FIQ entry didn't make any attempt to * preserve registers or return correctly; now in assembler. * * 11/ 2/96 - Hmm - doesn't work on real machine. Auto detect doesn't * and hacking that past seems to wait forever - check motor * being turned on. * * 17/ 2/96 - still having problems - forcing track to -1 when selecting * new drives seems to allow it to read first few sectors * but then we get solid hangs at apparently random places * which change depending what is happening. * * 9/ 3/96 - Fiddled a lot of stuff around to move to kernel 1.3.35 * A lot of fiddling in DMA stuff. Having problems with it * constnatly thinking its timeing out. Ah - its timeout * was set to (6*HZ) rather than jiffies+(6*HZ). Now giving * duff data! * * 5/ 4/96 - Made it use the new IOC_ macros rather than *ioc * Hmm - giving unexpected FIQ and then timeouts * 18/ 8/96 - Ran through indent -kr -i8 * Some changes to disc change detect; don't know how well it * works. * 24/ 8/96 - Put all the track buffering code back in from the atari * code - I wonder if it will still work... No :-) * Still works if I turn off track buffering. * 25/ 8/96 - Changed the timer expires that I'd added back to be * jiffies + ....; and it all sprang to life! Got 2.8K/sec * off a cp -r of a 679K disc (showed 94% cpu usage!) * (PC gets 14.3K/sec - 0% CPU!) Hmm - hard drive corrupt! * Also perhaps that compile was with cache off. * changed cli in fd_readtrack_check to cliIF * changed vmallocs to kmalloc (whats the difference!!) * Removed the busy wait loop in do_fd_request and replaced * by a routine on tq_immediate; only 11% cpu on a dd off the * raw disc - but the speed is the same. * 1/ 9/96 - Idea (failed!) - set the 'disable spin-up seqeunce' * when we read the track if we know the motor is on; didn't * help - perhaps we have to do it in stepping as well. * Nope. Still doesn't help. * Hmm - what seems to be happening is that fd_readtrack_check * is never getting called. Its job is to terminate the read * just after we think we should have got the data; otherwise * the fdc takes 1 second to timeout; which is what's happening * Now I can see 'readtrack_timer' being set (which should do the * call); but it never seems to be called - hmm! * OK - I've moved the check to my tq_immediate code - * and it WORKS! 13.95K/second at 19% CPU. * I wish I knew why that timer didn't work..... * * 16/11/96 - Fiddled and frigged for 2.0.18 * * DAG 30/01/99 - Started frobbing for 2.2.1 * DAG 20/06/99 - A little more frobbing: * Included include/asm/uaccess.h for get_user/put_user * * DAG 1/09/00 - Dusted off for 2.4.0-test7 * MAX_SECTORS was name clashing so it is now FD1772_... * Minor parameter, name layouts for 2.4.x differences */ #include <linux/sched.h> #include <linux/fs.h> #include <linux/fcntl.h> #include <linux/slab.h> #include <linux/kernel.h> #include <linux/interrupt.h> #include <linux/timer.h> #include <linux/tqueue.h> #include <linux/fd.h> #include <linux/fd1772.h> #include <linux/errno.h> #include <linux/types.h> #include <linux/delay.h> #include <linux/mm.h> #include <asm/arch/oldlatches.h> #include <asm/bitops.h> #include <asm/dma.h> #include <asm/hardware.h> #include <asm/hardware/ioc.h> #include <asm/io.h> #include <asm/irq.h> #include <asm/mach-types.h> #include <asm/pgtable.h> #include <asm/system.h> #include <asm/uaccess.h> #define MAJOR_NR FLOPPY_MAJOR #define FLOPPY_DMA 0 #include <linux/blk.h> /* Note: FD_MAX_UNITS could be redefined to 2 for the Atari (with * little additional rework in this file). But I'm not yet sure if * some other code depends on the number of floppies... (It is defined * in a public header!) */ #if 0 #undef FD_MAX_UNITS #define FD_MAX_UNITS 2 #endif /* Ditto worries for Arc - DAG */ #define FD_MAX_UNITS 4 #define TRACKBUFFER 0 /*#define DEBUG*/ #ifdef DEBUG #define DPRINT(a) printk a #else #define DPRINT(a) #endif /* Disk types: DD */ static struct archy_disk_type { const char *name; unsigned spt; /* sectors per track */ unsigned blocks; /* total number of blocks */ unsigned stretch; /* track doubling ? */ } disk_type[] = { { "d360", 9, 720, 0 }, /* 360kB diskette */ { "D360", 9, 720, 1 }, /* 360kb in 720kb drive */ { "D720", 9, 1440, 0 }, /* 720kb diskette (DD) */ /*{ "D820", 10,1640, 0}, *//* DD disk with 82 tracks/10 sectors - DAG - can't see how type detect can distinguish this from 720K until it reads block 4 by which time its too late! */ }; #define NUM_DISK_TYPES (sizeof(disk_type)/sizeof(*disk_type)) /* * Maximum disk size (in kilobytes). This default is used whenever the * current disk size is unknown. */ #define MAX_DISK_SIZE 720 static int floppy_sizes[256]; static int floppy_blocksizes[256]; /* current info on each unit */ static struct archy_floppy_struct { int connected; /* !=0 : drive is connected */ int autoprobe; /* !=0 : do autoprobe */ struct archy_disk_type *disktype; /* current type of disk */ int track; /* current head position or -1 * if unknown */ unsigned int steprate; /* steprate setting */ unsigned int wpstat; /* current state of WP signal * (for disk change detection) */ } unit[FD_MAX_UNITS]; /* DAG: On Arc we spin on a flag being cleared by fdc1772_comendhandler which is an assembler routine */ extern void fdc1772_comendhandler(void); /* Actually doens't have these parameters - see fd1772.S */ extern volatile int fdc1772_comendstatus; extern volatile int fdc1772_fdc_int_done; #define FDC1772BASE ((0x210000>>2)|0x80000000) #define FDC1772_READ(reg) inb(FDC1772BASE+(reg/2)) /* DAG: You wouldn't be silly to ask why FDC1772_WRITE is a function rather than the #def below - well simple - the #def won't compile - and I don't understand why (__outwc not defined) */ /* NOTE: Reg is 0,2,4,6 as opposed to 0,1,2,3 or 0,4,8,12 to keep compatibility with the ST version of fd1772.h */ /*#define FDC1772_WRITE(reg,val) outw(val,(reg+FDC1772BASE)); */ void FDC1772_WRITE(int reg, unsigned char val) { if (reg == FDC1772REG_CMD) { DPRINT(("FDC1772_WRITE new command 0x%x @ %d\n", val,jiffies)); if (fdc1772_fdc_int_done) { DPRINT(("FDC1772_WRITE: Hmm fdc1772_fdc_int_done true - resetting\n")); fdc1772_fdc_int_done = 0; }; }; outb(val, (reg / 2) + FDC1772BASE); }; #define FD1772_MAX_SECTORS 22 unsigned char *DMABuffer; /* buffer for writes */ /*static unsigned long PhysDMABuffer; *//* physical address */ /* DAG: On Arc we just go straight for the DMA buffer */ #define PhysDMABuffer DMABuffer #ifdef TRACKBUFFER unsigned char *TrackBuffer; /* buffer for reads */ #define PhysTrackBuffer TrackBuffer /* physical address */ static int BufferDrive, BufferSide, BufferTrack; static int read_track; /* non-zero if we are reading whole tracks */ #define SECTOR_BUFFER(sec) (TrackBuffer + ((sec)-1)*512) #define IS_BUFFERED(drive,side,track) \ (BufferDrive == (drive) && BufferSide == (side) && BufferTrack == (track)) #endif /* * These are global variables, as that's the easiest way to give * information to interrupts. They are the data used for the current * request. */ static int SelectedDrive = 0; static int ReqCmd, ReqBlock; static int ReqSide, ReqTrack, ReqSector, ReqCnt; static int HeadSettleFlag = 0; static unsigned char *ReqData, *ReqBuffer; static int MotorOn = 0, MotorOffTrys; /* Synchronization of FDC1772 access. */ static volatile int fdc_busy = 0; static DECLARE_WAIT_QUEUE_HEAD(fdc_wait); /* long req'd for set_bit --RR */ static unsigned long changed_floppies = 0xff, fake_change = 0; #define CHECK_CHANGE_DELAY HZ/2 /* DAG - increased to 30*HZ - not sure if this is the correct thing to do */ #define FD_MOTOR_OFF_DELAY (10*HZ) #define FD_MOTOR_OFF_MAXTRY (10*20) #define FLOPPY_TIMEOUT (6*HZ) #define RECALIBRATE_ERRORS 4 /* After this many errors the drive * will be recalibrated. */ #define MAX_ERRORS 8 /* After this many errors the driver * will give up. */ #define START_MOTOR_OFF_TIMER(delay) \ do { \ motor_off_timer.expires = jiffies + (delay); \ add_timer( &motor_off_timer ); \ MotorOffTrys = 0; \ } while(0) #define START_CHECK_CHANGE_TIMER(delay) \ do { \ mod_timer(&fd_timer, jiffies + (delay)); \ } while(0) #define START_TIMEOUT() \ do { \ mod_timer(&timeout_timer, jiffies+FLOPPY_TIMEOUT); \ } while(0) #define STOP_TIMEOUT() \ do { \ del_timer( &timeout_timer ); \ } while(0) #define ENABLE_IRQ() enable_irq(FIQ_FD1772+64); #define DISABLE_IRQ() disable_irq(FIQ_FD1772+64); static void fd1772_checkint(void); struct tq_struct fd1772_tq = { 0,0, (void *)fd1772_checkint, 0 }; /* * The driver is trying to determine the correct media format * while Probing is set. fd_rwsec_done() clears it after a * successful access. */ static int Probing = 0; /* This flag is set when a dummy seek is necesary to make the WP * status bit accessible. */ static int NeedSeek = 0; /***************************** Prototypes *****************************/ static void fd_select_side(int side); static void fd_select_drive(int drive); static void fd_deselect(void); static void fd_motor_off_timer(unsigned long dummy); static void check_change(unsigned long dummy); static __inline__ void set_head_settle_flag(void); static __inline__ int get_head_settle_flag(void); static void floppy_irqconsequencehandler(void); static void fd_error(void); static void do_fd_action(int drive); static void fd_calibrate(void); static void fd_calibrate_done(int status); static void fd_seek(void); static void fd_seek_done(int status); static void fd_rwsec(void); #ifdef TRACKBUFFER static void fd_readtrack_check( unsigned long dummy ); #endif static void fd_rwsec_done(int status); static void fd_times_out(unsigned long dummy); static void finish_fdc(void); static void finish_fdc_done(int dummy); static void floppy_off(unsigned int nr); static __inline__ void copy_buffer(void *from, void *to); static void setup_req_params(int drive); static void redo_fd_request(void); static int fd_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long param); static void fd_probe(int drive); static int fd_test_drive_present(int drive); static void config_types(void); static int floppy_open(struct inode *inode, struct file *filp); static int floppy_release(struct inode *inode, struct file *filp); static void do_fd_request(request_queue_t *); /************************* End of Prototypes **************************/ static struct timer_list motor_off_timer = { function: fd_motor_off_timer, }; #ifdef TRACKBUFFER static struct timer_list readtrack_timer = { function: fd_readtrack_check, }; #endif static struct timer_list timeout_timer = { function: fd_times_out, }; static struct timer_list fd_timer = { function: check_change, }; /* DAG: Haven't got a clue what this is? */ int stdma_islocked(void) { return 0; }; /* Select the side to use. */ static void fd_select_side(int side) { oldlatch_aupdate(LATCHA_SIDESEL, side ? 0 : LATCHA_SIDESEL); } /* Select a drive, update the FDC1772's track register */ static void fd_select_drive(int drive) { #ifdef DEBUG printk("fd_select_drive:%d\n", drive); #endif /* Hmm - nowhere do we seem to turn the motor on - I'm going to do it here! */ oldlatch_aupdate(LATCHA_MOTOR | LATCHA_INUSE, 0); if (drive == SelectedDrive) return; oldlatch_aupdate(LATCHA_FDSELALL, 0xf - (1 << drive)); /* restore track register to saved value */ FDC1772_WRITE(FDC1772REG_TRACK, unit[drive].track); udelay(25); SelectedDrive = drive; } /* Deselect both drives. */ static void fd_deselect(void) { unsigned long flags; DPRINT(("fd_deselect\n")); oldlatch_aupdate(LATCHA_FDSELALL | LATCHA_MOTOR | LATCHA_INUSE, 0xf | LATCHA_MOTOR | LATCHA_INUSE); SelectedDrive = -1; } /* This timer function deselects the drives when the FDC1772 switched the * motor off. The deselection cannot happen earlier because the FDC1772 * counts the index signals, which arrive only if one drive is selected. */ static void fd_motor_off_timer(unsigned long dummy) { unsigned long flags; unsigned char status; int delay; del_timer(&motor_off_timer); if (SelectedDrive < 0) /* no drive selected, needn't deselect anyone */ return; save_flags(flags); cli(); if (fdc_busy) /* was stdma_islocked */ goto retry; status = FDC1772_READ(FDC1772REG_STATUS); if (!(status & 0x80)) { /* * motor already turned off by FDC1772 -> deselect drives * In actual fact its this deselection which turns the motor * off on the Arc, since the motor control is actually on * Latch A */ DPRINT(("fdc1772: deselecting in fd_motor_off_timer\n")); fd_deselect(); MotorOn = 0; restore_flags(flags); return; } /* not yet off, try again */ retry: restore_flags(flags); /* Test again later; if tested too often, it seems there is no disk * in the drive and the FDC1772 will leave the motor on forever (or, * at least until a disk is inserted). So we'll test only twice * per second from then on... */ delay = (MotorOffTrys < FD_MOTOR_OFF_MAXTRY) ? (++MotorOffTrys, HZ / 20) : HZ / 2; START_MOTOR_OFF_TIMER(delay); } /* This function is repeatedly called to detect disk changes (as good * as possible) and keep track of the current state of the write protection. */ static void check_change(unsigned long dummy) { static int drive = 0; unsigned long flags; int stat; if (fdc_busy) return; /* Don't start poking about if the fdc is busy */ return; /* let's just forget it for the mo DAG */ if (++drive > 1 || !unit[drive].connected) drive = 0; save_flags(flags); cli(); if (!stdma_islocked()) { stat = !!(FDC1772_READ(FDC1772REG_STATUS) & FDC1772STAT_WPROT); /* The idea here is that if the write protect line has changed then the disc must have changed */ if (stat != unit[drive].wpstat) { DPRINT(("wpstat[%d] = %d\n", drive, stat)); unit[drive].wpstat = stat; set_bit(drive, &changed_floppies); } } restore_flags(flags); START_CHECK_CHANGE_TIMER(CHECK_CHANGE_DELAY); } /* Handling of the Head Settling Flag: This flag should be set after each * seek operation, because we don't use seeks with verify. */ static __inline__ void set_head_settle_flag(void) { HeadSettleFlag = FDC1772CMDADD_E; } static __inline__ int get_head_settle_flag(void) { int tmp = HeadSettleFlag; HeadSettleFlag = 0; return (tmp); } /* General Interrupt Handling */ static void (*FloppyIRQHandler) (int status) = NULL; static void floppy_irqconsequencehandler(void) { unsigned char status; void (*handler) (int); fdc1772_fdc_int_done = 0; handler = FloppyIRQHandler; FloppyIRQHandler = NULL; if (handler) { nop(); status = (unsigned char) fdc1772_comendstatus; DPRINT(("FDC1772 irq, status = %02x handler = %08lx\n", (unsigned int) status, (unsigned long) handler)); handler(status); } else { DPRINT(("FDC1772 irq, no handler status=%02x\n", fdc1772_comendstatus)); } DPRINT(("FDC1772 irq: end of floppy_irq\n")); } /* Error handling: If some error happened, retry some times, then * recalibrate, then try again, and fail after MAX_ERRORS. */ static void fd_error(void) { printk("FDC1772: fd_error\n"); /*panic("fd1772: fd_error"); *//* DAG tmp */ if (QUEUE_EMPTY) return; CURRENT->errors++; if (CURRENT->errors >= MAX_ERRORS) { printk("fd%d: too many errors.\n", SelectedDrive); end_request(0); } else if (CURRENT->errors == RECALIBRATE_ERRORS) { printk("fd%d: recalibrating\n", SelectedDrive); if (SelectedDrive != -1) unit[SelectedDrive].track = -1; } redo_fd_request(); } #define SET_IRQ_HANDLER(proc) do { FloppyIRQHandler = (proc); } while(0) /* do_fd_action() is the general procedure for a fd request: All * required parameter settings (drive select, side select, track * position) are checked and set if needed. For each of these * parameters and the actual reading or writing exist two functions: * one that starts the setting (or skips it if possible) and one * callback for the "done" interrupt. Each done func calls the next * set function to propagate the request down to fd_rwsec_done(). */ static void do_fd_action(int drive) { DPRINT(("do_fd_action unit[drive].track=%d\n", unit[drive].track)); #ifdef TRACKBUFFER repeat: if (IS_BUFFERED( drive, ReqSide, ReqTrack )) { if (ReqCmd == READ) { copy_buffer( SECTOR_BUFFER(ReqSector), ReqData ); if (++ReqCnt < CURRENT->current_nr_sectors) { /* read next sector */ setup_req_params( drive ); goto repeat; } else { /* all sectors finished */ CURRENT->nr_sectors -= CURRENT->current_nr_sectors; CURRENT->sector += CURRENT->current_nr_sectors; end_request( 1 ); redo_fd_request(); return; } } else { /* cmd == WRITE, pay attention to track buffer * consistency! */ copy_buffer( ReqData, SECTOR_BUFFER(ReqSector) ); } } #endif if (SelectedDrive != drive) { /*unit[drive].track = -1; DAG */ fd_select_drive(drive); }; if (unit[drive].track == -1) fd_calibrate(); else if (unit[drive].track != ReqTrack << unit[drive].disktype->stretch) fd_seek(); else fd_rwsec(); } /* Seek to track 0 if the current track is unknown */ static void fd_calibrate(void) { DPRINT(("fd_calibrate\n")); if (unit[SelectedDrive].track >= 0) { fd_calibrate_done(0); return; } DPRINT(("fd_calibrate (after track compare)\n")); SET_IRQ_HANDLER(fd_calibrate_done); /* we can't verify, since the speed may be incorrect */ FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_RESTORE | unit[SelectedDrive].steprate); NeedSeek = 1; MotorOn = 1; START_TIMEOUT(); /* wait for IRQ */ } static void fd_calibrate_done(int status) { DPRINT(("fd_calibrate_done()\n")); STOP_TIMEOUT(); /* set the correct speed now */ if (status & FDC1772STAT_RECNF) { printk("fd%d: restore failed\n", SelectedDrive); fd_error(); } else { unit[SelectedDrive].track = 0; fd_seek(); } } /* Seek the drive to the requested track. The drive must have been * calibrated at some point before this. */ static void fd_seek(void) { unsigned long flags; DPRINT(("fd_seek() to track %d (unit[SelectedDrive].track=%d)\n", ReqTrack, unit[SelectedDrive].track)); if (unit[SelectedDrive].track == ReqTrack << unit[SelectedDrive].disktype->stretch) { fd_seek_done(0); return; } FDC1772_WRITE(FDC1772REG_DATA, ReqTrack << unit[SelectedDrive].disktype->stretch); udelay(25); save_flags(flags); clf(); SET_IRQ_HANDLER(fd_seek_done); FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_SEEK | unit[SelectedDrive].steprate | /* DAG */ (MotorOn?FDC1772CMDADD_H:0)); restore_flags(flags); MotorOn = 1; set_head_settle_flag(); START_TIMEOUT(); /* wait for IRQ */ } static void fd_seek_done(int status) { DPRINT(("fd_seek_done()\n")); STOP_TIMEOUT(); /* set the correct speed */ if (status & FDC1772STAT_RECNF) { printk("fd%d: seek error (to track %d)\n", SelectedDrive, ReqTrack); /* we don't know exactly which track we are on now! */ unit[SelectedDrive].track = -1; fd_error(); } else { unit[SelectedDrive].track = ReqTrack << unit[SelectedDrive].disktype->stretch; NeedSeek = 0; fd_rwsec(); } } /* This does the actual reading/writing after positioning the head * over the correct track. */ #ifdef TRACKBUFFER static int MultReadInProgress = 0; #endif static void fd_rwsec(void) { unsigned long paddr, flags; unsigned int rwflag, old_motoron; unsigned int track; DPRINT(("fd_rwsec(), Sec=%d, Access=%c\n", ReqSector, ReqCmd == WRITE ? 'w' : 'r')); if (ReqCmd == WRITE) { /*cache_push( (unsigned long)ReqData, 512 ); */ paddr = (unsigned long) ReqData; rwflag = 0x100; } else { paddr = (unsigned long) PhysDMABuffer; #ifdef TRACKBUFFER if (read_track) paddr = (unsigned long)PhysTrackBuffer; #endif rwflag = 0; } DPRINT(("fd_rwsec() before sidesel rwflag=%d sec=%d trk=%d\n", rwflag, ReqSector, FDC1772_READ(FDC1772REG_TRACK))); fd_select_side(ReqSide); /*DPRINT(("fd_rwsec() before start sector \n")); */ /* Start sector of this operation */ #ifdef TRACKBUFFER FDC1772_WRITE( FDC1772REG_SECTOR, !read_track ? ReqSector : 1 ); #else FDC1772_WRITE( FDC1772REG_SECTOR, ReqSector ); #endif /* Cheat for track if stretch != 0 */ if (unit[SelectedDrive].disktype->stretch) { track = FDC1772_READ(FDC1772REG_TRACK); FDC1772_WRITE(FDC1772REG_TRACK, track >> unit[SelectedDrive].disktype->stretch); } udelay(25); DPRINT(("fd_rwsec() before setup DMA \n")); /* Setup DMA - Heavily modified by DAG */ save_flags(flags); clf(); disable_dma(FLOPPY_DMA); set_dma_mode(FLOPPY_DMA, rwflag ? DMA_MODE_WRITE : DMA_MODE_READ); set_dma_addr(FLOPPY_DMA, (long) paddr); /* DAG - changed from Atari specific */ #ifdef TRACKBUFFER set_dma_count(FLOPPY_DMA,(!read_track ? 1 : unit[SelectedDrive].disktype->spt)*512); #else set_dma_count(FLOPPY_DMA, 512); /* Block/sector size - going to have to change */ #endif SET_IRQ_HANDLER(fd_rwsec_done); /* Turn on dma int */ enable_dma(FLOPPY_DMA); /* Now give it something to do */ FDC1772_WRITE(FDC1772REG_CMD, (rwflag ? (FDC1772CMD_WRSEC | FDC1772CMDADD_P) : #ifdef TRACKBUFFER (FDC1772CMD_RDSEC | (read_track ? FDC1772CMDADD_M : 0) | /* Hmm - the idea here is to stop the FDC spinning the disc up when we know that we already still have it spinning */ (MotorOn?FDC1772CMDADD_H:0)) #else FDC1772CMD_RDSEC #endif )); restore_flags(flags); DPRINT(("fd_rwsec() after DMA setup flags=0x%08x\n", flags)); /*sti(); *//* DAG - Hmm */ /* Hmm - should do something DAG */ old_motoron = MotorOn; MotorOn = 1; NeedSeek = 1; /* wait for interrupt */ #ifdef TRACKBUFFER if (read_track) { /* * If reading a whole track, wait about one disk rotation and * then check if all sectors are read. The FDC will even * search for the first non-existant sector and need 1 sec to * recognise that it isn't present :-( */ /* 1 rot. + 5 rot.s if motor was off */ mod_timer(&readtrack_timer, jiffies + HZ/5 + (old_motoron ? 0 : HZ)); DPRINT(("Setting readtrack_timer to %d @ %d\n", readtrack_timer.expires,jiffies)); MultReadInProgress = 1; } #endif /*DPRINT(("fd_rwsec() before START_TIMEOUT \n")); */ START_TIMEOUT(); /*DPRINT(("fd_rwsec() after START_TIMEOUT \n")); */ } #ifdef TRACKBUFFER static void fd_readtrack_check(unsigned long dummy) { unsigned long flags, addr; extern unsigned char *fdc1772_dataaddr; DPRINT(("fd_readtrack_check @ %d\n",jiffies)); save_flags(flags); clf(); del_timer( &readtrack_timer ); if (!MultReadInProgress) { /* This prevents a race condition that could arise if the * interrupt is triggered while the calling of this timer * callback function takes place. The IRQ function then has * already cleared 'MultReadInProgress' when control flow * gets here. */ restore_flags(flags); return; } /* get the current DMA address */ addr=(unsigned long)fdc1772_dataaddr; /* DAG - ? */ DPRINT(("fd_readtrack_check: addr=%x PhysTrackBuffer=%x\n",addr,PhysTrackBuffer)); if (addr >= (unsigned int)PhysTrackBuffer + unit[SelectedDrive].disktype->spt*512) { /* already read enough data, force an FDC interrupt to stop * the read operation */ SET_IRQ_HANDLER( NULL ); restore_flags(flags); DPRINT(("fd_readtrack_check(): done\n")); FDC1772_WRITE( FDC1772REG_CMD, FDC1772CMD_FORCI ); udelay(25); /* No error until now -- the FDC would have interrupted * otherwise! */ fd_rwsec_done( 0 ); } else { /* not yet finished, wait another tenth rotation */ restore_flags(flags); DPRINT(("fd_readtrack_check(): not yet finished\n")); readtrack_timer.expires = jiffies + HZ/5/10; add_timer( &readtrack_timer ); } } #endif static void fd_rwsec_done(int status) { unsigned int track; DPRINT(("fd_rwsec_done() status=%d @ %d\n", status,jiffies)); #ifdef TRACKBUFFER if (read_track && !MultReadInProgress) return; MultReadInProgress = 0; STOP_TIMEOUT(); if (read_track) del_timer( &readtrack_timer ); #endif /* Correct the track if stretch != 0 */ if (unit[SelectedDrive].disktype->stretch) { track = FDC1772_READ(FDC1772REG_TRACK); FDC1772_WRITE(FDC1772REG_TRACK, track << unit[SelectedDrive].disktype->stretch); } if (ReqCmd == WRITE && (status & FDC1772STAT_WPROT)) { printk("fd%d: is write protected\n", SelectedDrive); goto err_end; } if ((status & FDC1772STAT_RECNF) #ifdef TRACKBUFFER /* RECNF is no error after a multiple read when the FDC * searched for a non-existant sector! */ && !(read_track && FDC1772_READ(FDC1772REG_SECTOR) > unit[SelectedDrive].disktype->spt) #endif ) { if (Probing) { if (unit[SelectedDrive].disktype > disk_type) { /* try another disk type */ unit[SelectedDrive].disktype--; floppy_sizes[SelectedDrive] = unit[SelectedDrive].disktype->blocks >> 1; } else Probing = 0; } else { /* record not found, but not probing. Maybe stretch wrong ? Restart probing */ if (unit[SelectedDrive].autoprobe) { unit[SelectedDrive].disktype = disk_type + NUM_DISK_TYPES - 1; floppy_sizes[SelectedDrive] = unit[SelectedDrive].disktype->blocks >> 1; Probing = 1; } } if (Probing) { setup_req_params(SelectedDrive); #ifdef TRACKBUFFER BufferDrive = -1; #endif do_fd_action(SelectedDrive); return; } printk("fd%d: sector %d not found (side %d, track %d)\n", SelectedDrive, FDC1772_READ(FDC1772REG_SECTOR), ReqSide, ReqTrack); goto err_end; } if (status & FDC1772STAT_CRC) { printk("fd%d: CRC error (side %d, track %d, sector %d)\n", SelectedDrive, ReqSide, ReqTrack, FDC1772_READ(FDC1772REG_SECTOR)); goto err_end; } if (status & FDC1772STAT_LOST) { printk("fd%d: lost data (side %d, track %d, sector %d)\n", SelectedDrive, ReqSide, ReqTrack, FDC1772_READ(FDC1772REG_SECTOR)); goto err_end; } Probing = 0; if (ReqCmd == READ) { #ifdef TRACKBUFFER if (!read_track) { /*cache_clear (PhysDMABuffer, 512);*/ copy_buffer (DMABuffer, ReqData); } else { /*cache_clear (PhysTrackBuffer, FD1772_MAX_SECTORS * 512);*/ BufferDrive = SelectedDrive; BufferSide = ReqSide; BufferTrack = ReqTrack; copy_buffer (SECTOR_BUFFER (ReqSector), ReqData); } #else /*cache_clear( PhysDMABuffer, 512 ); */ copy_buffer(DMABuffer, ReqData); #endif } if (++ReqCnt < CURRENT->current_nr_sectors) { /* read next sector */ setup_req_params(SelectedDrive); do_fd_action(SelectedDrive); } else { /* all sectors finished */ CURRENT->nr_sectors -= CURRENT->current_nr_sectors; CURRENT->sector += CURRENT->current_nr_sectors; end_request(1); redo_fd_request(); } return; err_end: #ifdef TRACKBUFFER BufferDrive = -1; #endif fd_error(); } static void fd_times_out(unsigned long dummy) { SET_IRQ_HANDLER(NULL); /* If the timeout occurred while the readtrack_check timer was * active, we need to cancel it, else bad things will happen */ del_timer( &readtrack_timer ); FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_FORCI); udelay(25); printk("floppy timeout\n"); STOP_TIMEOUT(); /* hmm - should we do this ? */ fd_error(); } /* The (noop) seek operation here is needed to make the WP bit in the * FDC1772 status register accessible for check_change. If the last disk * operation would have been a RDSEC, this bit would always read as 0 * no matter what :-( To save time, the seek goes to the track we're * already on. */ static void finish_fdc(void) { /* DAG - just try without this dummy seek! */ finish_fdc_done(0); return; if (!NeedSeek) { finish_fdc_done(0); } else { DPRINT(("finish_fdc: dummy seek started\n")); FDC1772_WRITE(FDC1772REG_DATA, unit[SelectedDrive].track); SET_IRQ_HANDLER(finish_fdc_done); FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_SEEK); MotorOn = 1; START_TIMEOUT(); /* we must wait for the IRQ here, because the ST-DMA is * released immediatly afterwards and the interrupt may be * delivered to the wrong driver. */ } } static void finish_fdc_done(int dummy) { unsigned long flags; DPRINT(("finish_fdc_done entered\n")); STOP_TIMEOUT(); NeedSeek = 0; if (timer_pending(&fd_timer) && time_after(jiffies + 5, fd_timer.expires)) /* If the check for a disk change is done too early after this * last seek command, the WP bit still reads wrong :-(( */ mod_timer(&fd_timer, jiffies + 5); else { /* START_CHECK_CHANGE_TIMER( CHECK_CHANGE_DELAY ); */ }; del_timer(&motor_off_timer); START_MOTOR_OFF_TIMER(FD_MOTOR_OFF_DELAY); save_flags(flags); cli(); /* stdma_release(); - not sure if I should do something DAG */ fdc_busy = 0; wake_up(&fdc_wait); restore_flags(flags); DPRINT(("finish_fdc() finished\n")); } /* Prevent "aliased" accesses. */ static int fd_ref[4]; static int fd_device[4]; /* * Current device number. Taken either from the block header or from the * format request descriptor. */ #define CURRENT_DEVICE (CURRENT->rq_dev) /* Current error count. */ #define CURRENT_ERRORS (CURRENT->errors) /* dummy for blk.h */ static void floppy_off(unsigned int nr) { } /* On the old arcs write protect depends on the particular model of machine. On the A310, R140, and A440 there is a disc changed detect, however on the A4x0/1 range there is not. There is nothing to tell you which machine your on. At the moment I'm just marking changed always. I've left the Atari's 'change on write protect change' code in this part (but nothing sets it). RiscOS apparently checks the disc serial number etc. to detect changes - but if it sees a disc change line go high (?) it flips to using it. Well maybe I'll add that in the future (!?) */ static int check_floppy_change(dev_t dev) { unsigned int drive = (dev & 0x03); if (MAJOR(dev) != MAJOR_NR) { printk("floppy_changed: not a floppy\n"); return 0; } if (test_bit(drive, &fake_change)) { /* simulated change (e.g. after formatting) */ return 1; } if (test_bit(drive, &changed_floppies)) { /* surely changed (the WP signal changed at least once) */ return 1; } if (unit[drive].wpstat) { /* WP is on -> could be changed: to be sure, buffers should be * invalidated... */ return 1; } return 1; /* DAG - was 0 */ } static int floppy_revalidate(dev_t dev) { int drive = dev & 3; if (test_bit(drive, &changed_floppies) || test_bit(drive, &fake_change) || unit[drive].disktype == 0) { #ifdef TRACKBUFFER BufferDrive = -1; #endif clear_bit(drive, &fake_change); clear_bit(drive, &changed_floppies); unit[drive].disktype = 0; } return 0; } static __inline__ void copy_buffer(void *from, void *to) { ulong *p1 = (ulong *) from, *p2 = (ulong *) to; int cnt; for (cnt = 512 / 4; cnt; cnt--) *p2++ = *p1++; } /* This sets up the global variables describing the current request. */ static void setup_req_params(int drive) { int block = ReqBlock + ReqCnt; ReqTrack = block / unit[drive].disktype->spt; ReqSector = block - ReqTrack * unit[drive].disktype->spt + 1; ReqSide = ReqTrack & 1; ReqTrack >>= 1; ReqData = ReqBuffer + 512 * ReqCnt; #ifdef TRACKBUFFER read_track = (ReqCmd == READ && CURRENT_ERRORS == 0); #endif DPRINT(("Request params: Si=%d Tr=%d Se=%d Data=%08lx\n", ReqSide, ReqTrack, ReqSector, (unsigned long) ReqData)); } static void redo_fd_request(void) { int device, drive, type; struct archy_floppy_struct *floppy; DPRINT(("redo_fd_request: CURRENT=%08lx CURRENT->rq_dev=%04x CURRENT->sector=%ld\n", (unsigned long) CURRENT, CURRENT ? CURRENT->rq_dev : 0, !QUEUE_EMPTY ? CURRENT->sector : 0)); if (!QUEUE_EMPTY && CURRENT->rq_status == RQ_INACTIVE) goto the_end; repeat: if (QUEUE_EMPTY) goto the_end; if (MAJOR(CURRENT->rq_dev) != MAJOR_NR) panic(DEVICE_NAME ": request list destroyed"); if (CURRENT->bh) { if (!buffer_locked(CURRENT->bh)) panic(DEVICE_NAME ": block not locked"); } device = MINOR(CURRENT_DEVICE); drive = device & 3; type = device >> 2; floppy = &unit[drive]; if (!floppy->connected) { /* drive not connected */ printk("Unknown Device: fd%d\n", drive); end_request(0); goto repeat; } if (type == 0) { if (!floppy->disktype) { Probing = 1; floppy->disktype = disk_type + NUM_DISK_TYPES - 1; floppy_sizes[drive] = floppy->disktype->blocks >> 1; floppy->autoprobe = 1; } } else { /* user supplied disk type */ --type; if (type >= NUM_DISK_TYPES) { printk("fd%d: invalid disk format", drive); end_request(0); goto repeat; } floppy->disktype = &disk_type[type]; floppy_sizes[drive] = disk_type[type].blocks >> 1; floppy->autoprobe = 0; } if (CURRENT->sector + 1 > floppy->disktype->blocks) { end_request(0); goto repeat; } /* stop deselect timer */ del_timer(&motor_off_timer); ReqCnt = 0; ReqCmd = CURRENT->cmd; ReqBlock = CURRENT->sector; ReqBuffer = CURRENT->buffer; setup_req_params(drive); do_fd_action(drive); return; the_end: finish_fdc(); } static void fd1772_checkint(void) { extern int fdc1772_bytestogo; /*printk("fd1772_checkint %d\n",fdc1772_fdc_int_done);*/ if (fdc1772_fdc_int_done) floppy_irqconsequencehandler(); if ((MultReadInProgress) && (fdc1772_bytestogo==0)) fd_readtrack_check(0); if (fdc_busy) { queue_task(&fd1772_tq,&tq_immediate); mark_bh(IMMEDIATE_BH); } } static void do_fd_request(request_queue_t* q) { unsigned long flags; DPRINT(("do_fd_request for pid %d\n", current->pid)); if (fdc_busy) return; save_flags(flags); cli(); while (fdc_busy) sleep_on(&fdc_wait); fdc_busy = 1; ENABLE_IRQ(); restore_flags(flags); fdc1772_fdc_int_done = 0; redo_fd_request(); queue_task(&fd1772_tq,&tq_immediate); mark_bh(IMMEDIATE_BH); } static int invalidate_drive(int rdev) { /* invalidate the buffer track to force a reread */ #ifdef TRACKBUFFER BufferDrive = -1; #endif set_bit(rdev & 3, &fake_change); check_disk_change(rdev); return 0; } static int fd_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long param) { int drive, device; device = inode->i_rdev; drive = MINOR(device); switch (cmd) { case FDFMTBEG: return 0; /* case FDC1772LRPRM: ??? DAG what does this do?? unit[drive].disktype = NULL; floppy_sizes[drive] = MAX_DISK_SIZE; return invalidate_drive (device); */ case FDFMTEND: case FDFLUSH: return invalidate_drive(drive); } if (!capable(CAP_SYS_ADMIN)) return -EPERM; if (drive < 0 || drive > 3) return -EINVAL; switch (cmd) { default: return -EINVAL; } return 0; } /* Initialize the 'unit' variable for drive 'drive' */ static void fd_probe(int drive) { unit[drive].connected = 0; unit[drive].disktype = NULL; if (!fd_test_drive_present(drive)) return; unit[drive].connected = 1; unit[drive].track = -1; /* If we put the auto detect back in this can go to 0 */ unit[drive].steprate = FDC1772STEP_6; MotorOn = 1; /* from probe restore operation! */ } /* This function tests the physical presence of a floppy drive (not * whether a disk is inserted). This is done by issuing a restore * command, waiting max. 2 seconds (that should be enough to move the * head across the whole disk) and looking at the state of the "TR00" * signal. This should now be raised if there is a drive connected * (and there is no hardware failure :-) Otherwise, the drive is * declared absent. */ static int fd_test_drive_present(int drive) { unsigned long timeout; unsigned char status; int ok; printk("fd_test_drive_present %d\n", drive); if (drive > 1) return (0); return (1); /* Simple hack for the moment - the autodetect doesn't seem to work on arc */ fd_select_drive(drive); /* disable interrupt temporarily */ DISABLE_IRQ(); FDC1772_WRITE(FDC1772REG_TRACK, 0x00); /* was ff00 why? */ FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_RESTORE | FDC1772CMDADD_H | FDC1772STEP_6); /*printk("fd_test_drive_present: Going into timeout loop\n"); */ for (ok = 0, timeout = jiffies + 2 * HZ + HZ / 2; time_before(jiffies, timeout);) { /* What does this piece of atariism do? - query for an interrupt? */ /* if (!(mfp.par_dt_reg & 0x20)) break; */ /* Well this is my nearest guess - quit when we get an FDC interrupt */ if (ioc_readb(IOC_FIQSTAT) & 2) break; } /*printk("fd_test_drive_present: Coming out of timeout loop\n"); */ status = FDC1772_READ(FDC1772REG_STATUS); ok = (status & FDC1772STAT_TR00) != 0; /*printk("fd_test_drive_present: ok=%d\n",ok); */ /* force interrupt to abort restore operation (FDC1772 would try * about 50 seconds!) */ FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_FORCI); udelay(500); status = FDC1772_READ(FDC1772REG_STATUS); udelay(20); /*printk("fd_test_drive_present: just before OK code %d\n",ok); */ if (ok) { /* dummy seek command to make WP bit accessible */ FDC1772_WRITE(FDC1772REG_DATA, 0); FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_SEEK); printk("fd_test_drive_present: just before wait for int\n"); /* DAG: Guess means wait for interrupt */ while (!(ioc_readb(IOC_FIQSTAT) & 2)); printk("fd_test_drive_present: just after wait for int\n"); status = FDC1772_READ(FDC1772REG_STATUS); } printk("fd_test_drive_present: just before ENABLE_IRQ\n"); ENABLE_IRQ(); printk("fd_test_drive_present: about to return\n"); return (ok); } /* Look how many and which kind of drives are connected. If there are * floppies, additionally start the disk-change and motor-off timers. */ static void config_types(void) { int drive, cnt = 0; printk("Probing floppy drive(s):\n"); for (drive = 0; drive < FD_MAX_UNITS; drive++) { fd_probe(drive); if (unit[drive].connected) { printk("fd%d\n", drive); ++cnt; } } if (FDC1772_READ(FDC1772REG_STATUS) & FDC1772STAT_BUSY) { /* If FDC1772 is still busy from probing, give it another FORCI * command to abort the operation. If this isn't done, the FDC1772 * will interrupt later and its IRQ line stays low, because * the status register isn't read. And this will block any * interrupts on this IRQ line :-( */ FDC1772_WRITE(FDC1772REG_CMD, FDC1772CMD_FORCI); udelay(500); FDC1772_READ(FDC1772REG_STATUS); udelay(20); } if (cnt > 0) { START_MOTOR_OFF_TIMER(FD_MOTOR_OFF_DELAY); if (cnt == 1) fd_select_drive(0); /*START_CHECK_CHANGE_TIMER( CHECK_CHANGE_DELAY ); */ } } /* * floppy_open check for aliasing (/dev/fd0 can be the same as * /dev/PS0 etc), and disallows simultaneous access to the same * drive with different device numbers. */ static int floppy_open(struct inode *inode, struct file *filp) { int drive; int old_dev; if (!filp) { DPRINT(("Weird, open called with filp=0\n")); return -EIO; } drive = MINOR(inode->i_rdev) & 3; if ((MINOR(inode->i_rdev) >> 2) > NUM_DISK_TYPES) return -ENXIO; old_dev = fd_device[drive]; if (fd_ref[drive]) if (old_dev != inode->i_rdev) return -EBUSY; if (fd_ref[drive] == -1 || (fd_ref[drive] && filp->f_flags & O_EXCL)) return -EBUSY; if (filp->f_flags & O_EXCL) fd_ref[drive] = -1; else fd_ref[drive]++; fd_device[drive] = inode->i_rdev; if (old_dev && old_dev != inode->i_rdev) invalidate_buffers(old_dev); if (filp->f_flags & O_NDELAY) return 0; if (filp->f_mode & 3) { check_disk_change(inode->i_rdev); if (filp->f_mode & 2) { if (unit[drive].wpstat) { floppy_release(inode, filp); return -EROFS; } } } return 0; } static int floppy_release(struct inode *inode, struct file *filp) { int drive = MINOR(inode->i_rdev) & 3; if (fd_ref[drive] < 0) fd_ref[drive] = 0; else if (!fd_ref[drive]--) { printk("floppy_release with fd_ref == 0"); fd_ref[drive] = 0; } return 0; } static struct block_device_operations floppy_fops = { open: floppy_open, release: floppy_release, ioctl: fd_ioctl, check_media_change: check_floppy_change, revalidate: floppy_revalidate, }; int fd1772_init(void) { int i; if (!machine_is_archimedes()) return 0; if (register_blkdev(MAJOR_NR, "fd", &floppy_fops)) { printk("Unable to get major %d for floppy\n", MAJOR_NR); return 1; } if (request_dma(FLOPPY_DMA, "fd1772")) { printk("Unable to grab DMA%d for the floppy (1772) driver\n", FLOPPY_DMA); return 1; }; if (request_dma(FIQ_FD1772, "fd1772 end")) { printk("Unable to grab DMA%d for the floppy (1772) driver\n", FIQ_FD1772); free_dma(FLOPPY_DMA); return 1; }; enable_dma(FIQ_FD1772); /* This inserts a call to our command end routine */ /* initialize variables */ SelectedDrive = -1; #ifdef TRACKBUFFER BufferDrive = BufferSide = BufferTrack = -1; /* Atari uses 512 - I want to eventually cope with 1K sectors */ DMABuffer = (char *)kmalloc((FD1772_MAX_SECTORS+1)*512,GFP_KERNEL); TrackBuffer = DMABuffer + 512; #else /* Allocate memory for the DMAbuffer - on the Atari this takes it out of some special memory... */ DMABuffer = (char *) kmalloc(2048); /* Copes with pretty large sectors */ #endif for (i = 0; i < FD_MAX_UNITS; i++) { unit[i].track = -1; } for (i = 0; i < 256; i++) if ((i >> 2) > 0 && (i >> 2) <= NUM_DISK_TYPES) floppy_sizes[i] = disk_type[(i >> 2) - 1].blocks >> 1; else floppy_sizes[i] = MAX_DISK_SIZE; blk_size[MAJOR_NR] = floppy_sizes; blksize_size[MAJOR_NR] = floppy_blocksizes; blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), do_fd_request); config_types(); return 0; } |