u14-34f.c 65.4 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971
/*
 *      u14-34f.c - Low-level driver for UltraStor 14F/34F SCSI host adapters.
 *
 *      03 Jun 2003 Rev. 8.10 for linux-2.5.70
 *        + Update for new IRQ API.
 *        + Use "goto" when appropriate.
 *        + Drop u14-34f.h.
 *        + Update for new module_param API.
 *        + Module parameters  can now be specified only in the
 *          same format as the kernel boot options.
 *
 *             boot option    old module param 
 *             -----------    ------------------
 *             addr,...       io_port=addr,...
 *             lc:[y|n]       linked_comm=[1|0]
 *             mq:xx          max_queue_depth=xx
 *             tm:[0|1|2]     tag_mode=[0|1|2]
 *             et:[y|n]       ext_tran=[1|0]
 *             of:[y|n]       have_old_firmware=[1|0]
 *
 *          A valid example using the new parameter format is:
 *          modprobe u14-34f "u14-34f=0x340,0x330,lc:y,tm:0,mq:4"
 *
 *          which is equivalent to the old format:
 *          modprobe u14-34f io_port=0x340,0x330 linked_comm=1 tag_mode=0 \
 *                        max_queue_depth=4
 *
 *          With actual module code, u14-34f and u14_34f are equivalent
 *          as module parameter names.
 *
 *      12 Feb 2003 Rev. 8.04 for linux 2.5.60
 *        + Release irq before calling scsi_register.
 *
 *      12 Nov 2002 Rev. 8.02 for linux 2.5.47
 *        + Release driver_lock before calling scsi_register.
 *
 *      11 Nov 2002 Rev. 8.01 for linux 2.5.47
 *        + Fixed bios_param and scsicam_bios_param calling parameters.
 *
 *      28 Oct 2002 Rev. 8.00 for linux 2.5.44-ac4
 *        + Use new tcq and adjust_queue_depth api.
 *        + New command line option (tm:[0-2]) to choose the type of tags:
 *          0 -> disable tagging ; 1 -> simple tags  ; 2 -> ordered tags.
 *          Default is tm:0 (tagged commands disabled).
 *          For compatibility the "tc:" option is an alias of the "tm:"
 *          option; tc:n is equivalent to tm:0 and tc:y is equivalent to
 *          tm:1.
 *
 *      10 Oct 2002 Rev. 7.70 for linux 2.5.42
 *        + Foreport from revision 6.70.
 *
 *      25 Jun 2002 Rev. 6.70 for linux 2.4.19
 *        + Fixed endian-ness problem due to bitfields.
 *
 *      21 Feb 2002 Rev. 6.52 for linux 2.4.18
 *        + Backport from rev. 7.22 (use io_request_lock).
 *
 *      20 Feb 2002 Rev. 7.22 for linux 2.5.5
 *        + Remove any reference to virt_to_bus().
 *        + Fix pio hang while detecting multiple HBAs.
 *
 *      01 Jan 2002 Rev. 7.20 for linux 2.5.1
 *        + Use the dynamic DMA mapping API.
 *
 *      19 Dec 2001 Rev. 7.02 for linux 2.5.1
 *        + Use SCpnt->sc_data_direction if set.
 *        + Use sglist.page instead of sglist.address.
 *
 *      11 Dec 2001 Rev. 7.00 for linux 2.5.1
 *        + Use host->host_lock instead of io_request_lock.
 *
 *       1 May 2001 Rev. 6.05 for linux 2.4.4
 *        + Fix data transfer direction for opcode SEND_CUE_SHEET (0x5d)
 *
 *      25 Jan 2001 Rev. 6.03 for linux 2.4.0
 *        + "check_region" call replaced by "request_region".
 *
 *      22 Nov 2000 Rev. 6.02 for linux 2.4.0-test11
 *        + Removed old scsi error handling support.
 *        + The obsolete boot option flag eh:n is silently ignored.
 *        + Removed error messages while a disk drive is powered up at
 *          boot time.
 *        + Improved boot messages: all tagged capable device are
 *          indicated as "tagged".
 *
 *      16 Sep 1999 Rev. 5.11 for linux 2.2.12 and 2.3.18
 *        + Updated to the new __setup interface for boot command line options.
 *        + When loaded as a module, accepts the new parameter boot_options
 *          which value is a string with the same format of the kernel boot
 *          command line options. A valid example is:
 *          modprobe u14-34f 'boot_options="0x230,0x340,lc:y,mq:4"'
 *
 *      22 Jul 1999 Rev. 5.00 for linux 2.2.10 and 2.3.11
 *        + Removed pre-2.2 source code compatibility.
 *
 *      26 Jul 1998 Rev. 4.33 for linux 2.0.35 and 2.1.111
 *          Added command line option (et:[y|n]) to use the existing
 *          translation (returned by scsicam_bios_param) as disk geometry.
 *          The default is et:n, which uses the disk geometry jumpered
 *          on the board.
 *          The default value et:n is compatible with all previous revisions
 *          of this driver.
 *
 *      28 May 1998 Rev. 4.32 for linux 2.0.33 and 2.1.104
 *          Increased busy timeout from 10 msec. to 200 msec. while
 *          processing interrupts.
 *
 *      18 May 1998 Rev. 4.31 for linux 2.0.33 and 2.1.102
 *          Improved abort handling during the eh recovery process.
 *
 *      13 May 1998 Rev. 4.30 for linux 2.0.33 and 2.1.101
 *          The driver is now fully SMP safe, including the
 *          abort and reset routines.
 *          Added command line options (eh:[y|n]) to choose between
 *          new_eh_code and the old scsi code.
 *          If linux version >= 2.1.101 the default is eh:y, while the eh
 *          option is ignored for previous releases and the old scsi code
 *          is used.
 *
 *      18 Apr 1998 Rev. 4.20 for linux 2.0.33 and 2.1.97
 *          Reworked interrupt handler.
 *
 *      11 Apr 1998 rev. 4.05 for linux 2.0.33 and 2.1.95
 *          Major reliability improvement: when a batch with overlapping
 *          requests is detected, requests are queued one at a time
 *          eliminating any possible board or drive reordering.
 *
 *      10 Apr 1998 rev. 4.04 for linux 2.0.33 and 2.1.95
 *          Improved SMP support (if linux version >= 2.1.95).
 *
 *       9 Apr 1998 rev. 4.03 for linux 2.0.33 and 2.1.94
 *          Performance improvement: when sequential i/o is detected,
 *          always use direct sort instead of reverse sort.
 *
 *       4 Apr 1998 rev. 4.02 for linux 2.0.33 and 2.1.92
 *          io_port is now unsigned long.
 *
 *      17 Mar 1998 rev. 4.01 for linux 2.0.33 and 2.1.88
 *          Use new scsi error handling code (if linux version >= 2.1.88).
 *          Use new interrupt code.
 *
 *      12 Sep 1997 rev. 3.11 for linux 2.0.30 and 2.1.55
 *          Use of udelay inside the wait loops to avoid timeout
 *          problems with fast cpus.
 *          Removed check about useless calls to the interrupt service
 *          routine (reported on SMP systems only).
 *          At initialization time "sorted/unsorted" is displayed instead
 *          of "linked/unlinked" to reinforce the fact that "linking" is
 *          nothing but "elevator sorting" in the actual implementation.
 *
 *      17 May 1997 rev. 3.10 for linux 2.0.30 and 2.1.38
 *          Use of serial_number_at_timeout in abort and reset processing.
 *          Use of the __initfunc and __initdata macro in setup code.
 *          Minor cleanups in the list_statistics code.
 *
 *      24 Feb 1997 rev. 3.00 for linux 2.0.29 and 2.1.26
 *          When loading as a module, parameter passing is now supported
 *          both in 2.0 and in 2.1 style.
 *          Fixed data transfer direction for some SCSI opcodes.
 *          Immediate acknowledge to request sense commands.
 *          Linked commands to each disk device are now reordered by elevator
 *          sorting. Rare cases in which reordering of write requests could
 *          cause wrong results are managed.
 *
 *      18 Jan 1997 rev. 2.60 for linux 2.1.21 and 2.0.28
 *          Added command line options to enable/disable linked commands
 *          (lc:[y|n]), old firmware support (of:[y|n]) and to set the max
 *          queue depth (mq:xx). Default is "u14-34f=lc:n,of:n,mq:8".
 *          Improved command linking.
 *
 *       8 Jan 1997 rev. 2.50 for linux 2.1.20 and 2.0.27
 *          Added linked command support.
 *
 *       3 Dec 1996 rev. 2.40 for linux 2.1.14 and 2.0.27
 *          Added queue depth adjustment.
 *
 *      22 Nov 1996 rev. 2.30 for linux 2.1.12 and 2.0.26
 *          The list of i/o ports to be probed can be overwritten by the
 *          "u14-34f=port0,port1,...." boot command line option.
 *          Scatter/gather lists are now allocated by a number of kmalloc
 *          calls, in order to avoid the previous size limit of 64Kb.
 *
 *      16 Nov 1996 rev. 2.20 for linux 2.1.10 and 2.0.25
 *          Added multichannel support.
 *
 *      27 Sep 1996 rev. 2.12 for linux 2.1.0
 *          Portability cleanups (virtual/bus addressing, little/big endian
 *          support).
 *
 *      09 Jul 1996 rev. 2.11 for linux 2.0.4
 *          "Data over/under-run" no longer implies a redo on all targets.
 *          Number of internal retries is now limited.
 *
 *      16 Apr 1996 rev. 2.10 for linux 1.3.90
 *          New argument "reset_flags" to the reset routine.
 *
 *      21 Jul 1995 rev. 2.02 for linux 1.3.11
 *          Fixed Data Transfer Direction for some SCSI commands.
 *
 *      13 Jun 1995 rev. 2.01 for linux 1.2.10
 *          HAVE_OLD_UX4F_FIRMWARE should be defined for U34F boards when
 *          the firmware prom is not the latest one (28008-006).
 *
 *      11 Mar 1995 rev. 2.00 for linux 1.2.0
 *          Fixed a bug which prevented media change detection for removable
 *          disk drives.
 *
 *      23 Feb 1995 rev. 1.18 for linux 1.1.94
 *          Added a check for scsi_register returning NULL.
 *
 *      11 Feb 1995 rev. 1.17 for linux 1.1.91
 *          U14F qualified to run with 32 sglists.
 *          Now DEBUG_RESET is disabled by default.
 *
 *       9 Feb 1995 rev. 1.16 for linux 1.1.90
 *          Use host->wish_block instead of host->block.
 *
 *       8 Feb 1995 rev. 1.15 for linux 1.1.89
 *          Cleared target_time_out counter while performing a reset.
 *
 *      28 Jan 1995 rev. 1.14 for linux 1.1.86
 *          Added module support.
 *          Log and do a retry when a disk drive returns a target status
 *          different from zero on a recovered error.
 *          Auto detects if U14F boards have an old firmware revision.
 *          Max number of scatter/gather lists set to 16 for all boards
 *          (most installation run fine using 33 sglists, while other
 *          has problems when using more than 16).
 *
 *      16 Jan 1995 rev. 1.13 for linux 1.1.81
 *          Display a message if check_region detects a port address
 *          already in use.
 *
 *      15 Dec 1994 rev. 1.12 for linux 1.1.74
 *          The host->block flag is set for all the detected ISA boards.
 *
 *      30 Nov 1994 rev. 1.11 for linux 1.1.68
 *          Redo i/o on target status CHECK_CONDITION for TYPE_DISK only.
 *          Added optional support for using a single board at a time.
 *
 *      14 Nov 1994 rev. 1.10 for linux 1.1.63
 *
 *      28 Oct 1994 rev. 1.09 for linux 1.1.58  Final BETA release.
 *      16 Jul 1994 rev. 1.00 for linux 1.1.29  Initial ALPHA release.
 *
 *          This driver is a total replacement of the original UltraStor
 *          scsi driver, but it supports ONLY the 14F and 34F boards.
 *          It can be configured in the same kernel in which the original
 *          ultrastor driver is configured to allow the original U24F
 *          support.
 *
 *          Multiple U14F and/or U34F host adapters are supported.
 *
 *  Copyright (C) 1994-2003 Dario Ballabio (ballabio_dario@emc.com)
 *
 *  Alternate email: dario.ballabio@inwind.it, dario.ballabio@tiscalinet.it
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that redistributions of source
 *  code retain the above copyright notice and this comment without
 *  modification.
 *
 *      WARNING: if your 14/34F board has an old firmware revision (see below)
 *               you must change "#undef" into "#define" in the following
 *               statement.
 */
#undef HAVE_OLD_UX4F_FIRMWARE
/*
 *  The UltraStor 14F, 24F, and 34F are a family of intelligent, high
 *  performance SCSI-2 host adapters.
 *  Here is the scoop on the various models:
 *
 *  14F - ISA first-party DMA HA with floppy support and WD1003 emulation.
 *  24F - EISA Bus Master HA with floppy support and WD1003 emulation.
 *  34F - VESA Local-Bus Bus Master HA (no WD1003 emulation).
 *
 *  This code has been tested with up to two U14F boards, using both
 *  firmware 28004-005/38004-004 (BIOS rev. 2.00) and the latest firmware
 *  28004-006/38004-005 (BIOS rev. 2.01).
 *
 *  The latest firmware is required in order to get reliable operations when
 *  clustering is enabled. ENABLE_CLUSTERING provides a performance increase
 *  up to 50% on sequential access.
 *
 *  Since the struct scsi_host_template structure is shared among all 14F and 34F,
 *  the last setting of use_clustering is in effect for all of these boards.
 *
 *  Here a sample configuration using two U14F boards:
 *
 U14F0: ISA 0x330, BIOS 0xc8000, IRQ 11, DMA 5, SG 32, MB 16, of:n, lc:y, mq:8.
 U14F1: ISA 0x340, BIOS 0x00000, IRQ 10, DMA 6, SG 32, MB 16, of:n, lc:y, mq:8.
 *
 *  The boot controller must have its BIOS enabled, while other boards can
 *  have their BIOS disabled, or enabled to an higher address.
 *  Boards are named Ux4F0, Ux4F1..., according to the port address order in
 *  the io_port[] array.
 *
 *  The following facts are based on real testing results (not on
 *  documentation) on the above U14F board.
 *
 *  - The U14F board should be jumpered for bus on time less or equal to 7
 *    microseconds, while the default is 11 microseconds. This is order to
 *    get acceptable performance while using floppy drive and hard disk
 *    together. The jumpering for 7 microseconds is: JP13 pin 15-16,
 *    JP14 pin 7-8 and pin 9-10.
 *    The reduction has a little impact on scsi performance.
 *
 *  - If scsi bus length exceeds 3m., the scsi bus speed needs to be reduced
 *    from 10Mhz to 5Mhz (do this by inserting a jumper on JP13 pin 7-8).
 *
 *  - If U14F on board firmware is older than 28004-006/38004-005,
 *    the U14F board is unable to provide reliable operations if the scsi
 *    request length exceeds 16Kbyte. When this length is exceeded the
 *    behavior is:
 *    - adapter_status equal 0x96 or 0xa3 or 0x93 or 0x94;
 *    - adapter_status equal 0 and target_status equal 2 on for all targets
 *      in the next operation following the reset.
 *    This sequence takes a long time (>3 seconds), so in the meantime
 *    the SD_TIMEOUT in sd.c could expire giving rise to scsi aborts
 *    (SD_TIMEOUT has been increased from 3 to 6 seconds in 1.1.31).
 *    Because of this I had to DISABLE_CLUSTERING and to work around the
 *    bus reset in the interrupt service routine, returning DID_BUS_BUSY
 *    so that the operations are retried without complains from the scsi.c
 *    code.
 *    Any reset of the scsi bus is going to kill tape operations, since
 *    no retry is allowed for tapes. Bus resets are more likely when the
 *    scsi bus is under heavy load.
 *    Requests using scatter/gather have a maximum length of 16 x 1024 bytes
 *    when DISABLE_CLUSTERING is in effect, but unscattered requests could be
 *    larger than 16Kbyte.
 *
 *    The new firmware has fixed all the above problems.
 *
 *  For U34F boards the latest bios prom is 38008-002 (BIOS rev. 2.01),
 *  the latest firmware prom is 28008-006. Older firmware 28008-005 has
 *  problems when using more than 16 scatter/gather lists.
 *
 *  The list of i/o ports to be probed can be totally replaced by the
 *  boot command line option: "u14-34f=port0,port1,port2,...", where the
 *  port0, port1... arguments are ISA/VESA addresses to be probed.
 *  For example using "u14-34f=0x230,0x340", the driver probes only the two
 *  addresses 0x230 and 0x340 in this order; "u14-34f=0" totally disables
 *  this driver.
 *
 *  After the optional list of detection probes, other possible command line
 *  options are:
 *
 *  et:y  use disk geometry returned by scsicam_bios_param;
 *  et:n  use disk geometry jumpered on the board;
 *  lc:y  enables linked commands;
 *  lc:n  disables linked commands;
 *  tm:0  disables tagged commands (same as tc:n);
 *  tm:1  use simple queue tags (same as tc:y);
 *  tm:2  use ordered queue tags (same as tc:2);
 *  of:y  enables old firmware support;
 *  of:n  disables old firmware support;
 *  mq:xx set the max queue depth to the value xx (2 <= xx <= 8).
 *
 *  The default value is: "u14-34f=lc:n,of:n,mq:8,tm:0,et:n".
 *  An example using the list of detection probes could be:
 *  "u14-34f=0x230,0x340,lc:y,tm:2,of:n,mq:4,et:n".
 *
 *  When loading as a module, parameters can be specified as well.
 *  The above example would be (use 1 in place of y and 0 in place of n):
 *
 *  modprobe u14-34f io_port=0x230,0x340 linked_comm=1 have_old_firmware=0 \
 *                max_queue_depth=4 ext_tran=0 tag_mode=2
 *
 *  ----------------------------------------------------------------------------
 *  In this implementation, linked commands are designed to work with any DISK
 *  or CD-ROM, since this linking has only the intent of clustering (time-wise)
 *  and reordering by elevator sorting commands directed to each device,
 *  without any relation with the actual SCSI protocol between the controller
 *  and the device.
 *  If Q is the queue depth reported at boot time for each device (also named
 *  cmds/lun) and Q > 2, whenever there is already an active command to the
 *  device all other commands to the same device  (up to Q-1) are kept waiting
 *  in the elevator sorting queue. When the active command completes, the
 *  commands in this queue are sorted by sector address. The sort is chosen
 *  between increasing or decreasing by minimizing the seek distance between
 *  the sector of the commands just completed and the sector of the first
 *  command in the list to be sorted.
 *  Trivial math assures that the unsorted average seek distance when doing
 *  random seeks over S sectors is S/3.
 *  When (Q-1) requests are uniformly distributed over S sectors, the average
 *  distance between two adjacent requests is S/((Q-1) + 1), so the sorted
 *  average seek distance for (Q-1) random requests over S sectors is S/Q.
 *  The elevator sorting hence divides the seek distance by a factor Q/3.
 *  The above pure geometric remarks are valid in all cases and the
 *  driver effectively reduces the seek distance by the predicted factor
 *  when there are Q concurrent read i/o operations on the device, but this
 *  does not necessarily results in a noticeable performance improvement:
 *  your mileage may vary....
 *
 *  Note: command reordering inside a batch of queued commands could cause
 *        wrong results only if there is at least one write request and the
 *        intersection (sector-wise) of all requests is not empty.
 *        When the driver detects a batch including overlapping requests
 *        (a really rare event) strict serial (pid) order is enforced.
 *  ----------------------------------------------------------------------------
 *
 *  The boards are named Ux4F0, Ux4F1,... according to the detection order.
 *
 *  In order to support multiple ISA boards in a reliable way,
 *  the driver sets host->wish_block = TRUE for all ISA boards.
 */

#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <asm/byteorder.h>
#include <linux/proc_fs.h>
#include <linux/blkdev.h>
#include <linux/interrupt.h>
#include <linux/stat.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/ctype.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <asm/dma.h>
#include <asm/irq.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsicam.h>

static int u14_34f_detect(struct scsi_host_template *);
static int u14_34f_release(struct Scsi_Host *);
static int u14_34f_queuecommand(struct Scsi_Host *, struct scsi_cmnd *);
static int u14_34f_eh_abort(struct scsi_cmnd *);
static int u14_34f_eh_host_reset(struct scsi_cmnd *);
static int u14_34f_bios_param(struct scsi_device *, struct block_device *,
                              sector_t, int *);
static int u14_34f_slave_configure(struct scsi_device *);

static struct scsi_host_template driver_template = {
                .name                    = "UltraStor 14F/34F rev. 8.10.00 ",
                .detect                  = u14_34f_detect,
                .release                 = u14_34f_release,
                .queuecommand            = u14_34f_queuecommand,
                .eh_abort_handler        = u14_34f_eh_abort,
                .eh_host_reset_handler   = u14_34f_eh_host_reset,
                .bios_param              = u14_34f_bios_param,
                .slave_configure         = u14_34f_slave_configure,
                .this_id                 = 7,
                .unchecked_isa_dma       = 1,
                .use_clustering          = ENABLE_CLUSTERING,
                };

#if !defined(__BIG_ENDIAN_BITFIELD) && !defined(__LITTLE_ENDIAN_BITFIELD)
#error "Adjust your <asm/byteorder.h> defines"
#endif

/* Values for the PRODUCT_ID ports for the 14/34F */
#define PRODUCT_ID1  0x56
#define PRODUCT_ID2  0x40        /* NOTE: Only upper nibble is used */

/* Subversion values */
#define ISA  0
#define ESA 1

#define OP_HOST_ADAPTER   0x1
#define OP_SCSI           0x2
#define OP_RESET          0x4
#define DTD_SCSI          0x0
#define DTD_IN            0x1
#define DTD_OUT           0x2
#define DTD_NONE          0x3
#define HA_CMD_INQUIRY    0x1
#define HA_CMD_SELF_DIAG  0x2
#define HA_CMD_READ_BUFF  0x3
#define HA_CMD_WRITE_BUFF 0x4

#undef  DEBUG_LINKED_COMMANDS
#undef  DEBUG_DETECT
#undef  DEBUG_INTERRUPT
#undef  DEBUG_RESET
#undef  DEBUG_GENERATE_ERRORS
#undef  DEBUG_GENERATE_ABORTS
#undef  DEBUG_GEOMETRY

#define MAX_ISA 3
#define MAX_VESA 1
#define MAX_EISA 0
#define MAX_PCI 0
#define MAX_BOARDS (MAX_ISA + MAX_VESA + MAX_EISA + MAX_PCI)
#define MAX_CHANNEL 1
#define MAX_LUN 8
#define MAX_TARGET 8
#define MAX_MAILBOXES 16
#define MAX_SGLIST 32
#define MAX_SAFE_SGLIST 16
#define MAX_INTERNAL_RETRIES 64
#define MAX_CMD_PER_LUN 2
#define MAX_TAGGED_CMD_PER_LUN (MAX_MAILBOXES - MAX_CMD_PER_LUN)

#define SKIP ULONG_MAX
#define FALSE 0
#define TRUE 1
#define FREE 0
#define IN_USE   1
#define LOCKED   2
#define IN_RESET 3
#define IGNORE   4
#define READY    5
#define ABORTING 6
#define NO_DMA  0xff
#define MAXLOOP  10000
#define TAG_DISABLED 0
#define TAG_SIMPLE   1
#define TAG_ORDERED  2

#define REG_LCL_MASK      0
#define REG_LCL_INTR      1
#define REG_SYS_MASK      2
#define REG_SYS_INTR      3
#define REG_PRODUCT_ID1   4
#define REG_PRODUCT_ID2   5
#define REG_CONFIG1       6
#define REG_CONFIG2       7
#define REG_OGM           8
#define REG_ICM           12
#define REGION_SIZE       13UL
#define BSY_ASSERTED      0x01
#define IRQ_ASSERTED      0x01
#define CMD_RESET         0xc0
#define CMD_OGM_INTR      0x01
#define CMD_CLR_INTR      0x01
#define CMD_ENA_INTR      0x81
#define ASOK              0x00
#define ASST              0x91

#define YESNO(a) ((a) ? 'y' : 'n')
#define TLDEV(type) ((type) == TYPE_DISK || (type) == TYPE_ROM)

#define PACKED          __attribute__((packed))

struct sg_list {
   unsigned int address;                /* Segment Address */
   unsigned int num_bytes;              /* Segment Length */
   };

/* MailBox SCSI Command Packet */
struct mscp {

#if defined(__BIG_ENDIAN_BITFIELD)
   unsigned char sg:1, ca:1, dcn:1, xdir:2, opcode:3;
   unsigned char lun: 3, channel:2, target:3;
#else
   unsigned char opcode: 3,             /* type of command */
                 xdir: 2,               /* data transfer direction */
                 dcn: 1,                /* disable disconnect */
                 ca: 1,                 /* use cache (if available) */
                 sg: 1;                 /* scatter/gather operation */
   unsigned char target: 3,             /* SCSI target id */
                 channel: 2,            /* SCSI channel number */
                 lun: 3;                /* SCSI logical unit number */
#endif

   unsigned int data_address PACKED;    /* transfer data pointer */
   unsigned int data_len PACKED;        /* length in bytes */
   unsigned int link_address PACKED;    /* for linking command chains */
   unsigned char clink_id;              /* identifies command in chain */
   unsigned char use_sg;                /* (if sg is set) 8 bytes per list */
   unsigned char sense_len;
   unsigned char cdb_len;               /* 6, 10, or 12 */
   unsigned char cdb[12];               /* SCSI Command Descriptor Block */
   unsigned char adapter_status;        /* non-zero indicates HA error */
   unsigned char target_status;         /* non-zero indicates target error */
   unsigned int sense_addr PACKED;

   /* Additional fields begin here. */
   struct scsi_cmnd *SCpnt;
   unsigned int cpp_index;              /* cp index */

   /* All the cp structure is zero filled by queuecommand except the
      following CP_TAIL_SIZE bytes, initialized by detect */
   dma_addr_t cp_dma_addr; /* dma handle for this cp structure */
   struct sg_list *sglist; /* pointer to the allocated SG list */
   };

#define CP_TAIL_SIZE (sizeof(struct sglist *) + sizeof(dma_addr_t))

struct hostdata {
   struct mscp cp[MAX_MAILBOXES];       /* Mailboxes for this board */
   unsigned int cp_stat[MAX_MAILBOXES]; /* FREE, IN_USE, LOCKED, IN_RESET */
   unsigned int last_cp_used;           /* Index of last mailbox used */
   unsigned int iocount;                /* Total i/o done for this board */
   int board_number;                    /* Number of this board */
   char board_name[16];                 /* Name of this board */
   int in_reset;                        /* True if board is doing a reset */
   int target_to[MAX_TARGET][MAX_CHANNEL]; /* N. of timeout errors on target */
   int target_redo[MAX_TARGET][MAX_CHANNEL]; /* If TRUE redo i/o on target */
   unsigned int retries;                /* Number of internal retries */
   unsigned long last_retried_pid;      /* Pid of last retried command */
   unsigned char subversion;            /* Bus type, either ISA or ESA */
   struct pci_dev *pdev;                /* Always NULL */
   unsigned char heads;
   unsigned char sectors;
   char board_id[256];                  /* data from INQUIRY on this board */
   };

static struct Scsi_Host *sh[MAX_BOARDS + 1];
static const char *driver_name = "Ux4F";
static char sha[MAX_BOARDS];
static DEFINE_SPINLOCK(driver_lock);

/* Initialize num_boards so that ihdlr can work while detect is in progress */
static unsigned int num_boards = MAX_BOARDS;

static unsigned long io_port[] = {

   /* Space for MAX_INT_PARAM ports usable while loading as a module */
   SKIP,    SKIP,   SKIP,   SKIP,   SKIP,   SKIP,   SKIP,   SKIP,
   SKIP,    SKIP,

   /* Possible ISA/VESA ports */
   0x330, 0x340, 0x230, 0x240, 0x210, 0x130, 0x140,

   /* End of list */
   0x0
   };

#define HD(board) ((struct hostdata *) &sh[board]->hostdata)
#define BN(board) (HD(board)->board_name)

/* Device is Little Endian */
#define H2DEV(x) cpu_to_le32(x)
#define DEV2H(x) le32_to_cpu(x)

static irqreturn_t do_interrupt_handler(int, void *);
static void flush_dev(struct scsi_device *, unsigned long, unsigned int, unsigned int);
static int do_trace = FALSE;
static int setup_done = FALSE;
static int link_statistics;
static int ext_tran = FALSE;

#if defined(HAVE_OLD_UX4F_FIRMWARE)
static int have_old_firmware = TRUE;
#else
static int have_old_firmware = FALSE;
#endif

#if defined(CONFIG_SCSI_U14_34F_TAGGED_QUEUE)
static int tag_mode = TAG_SIMPLE;
#else
static int tag_mode = TAG_DISABLED;
#endif

#if defined(CONFIG_SCSI_U14_34F_LINKED_COMMANDS)
static int linked_comm = TRUE;
#else
static int linked_comm = FALSE;
#endif

#if defined(CONFIG_SCSI_U14_34F_MAX_TAGS)
static int max_queue_depth = CONFIG_SCSI_U14_34F_MAX_TAGS;
#else
static int max_queue_depth = MAX_CMD_PER_LUN;
#endif

#define MAX_INT_PARAM 10
#define MAX_BOOT_OPTIONS_SIZE 256
static char boot_options[MAX_BOOT_OPTIONS_SIZE];

#if defined(MODULE)
#include <linux/module.h>
#include <linux/moduleparam.h>

module_param_string(u14_34f, boot_options, MAX_BOOT_OPTIONS_SIZE, 0);
MODULE_PARM_DESC(u14_34f, " equivalent to the \"u14-34f=...\" kernel boot " \
"option." \
"      Example: modprobe u14-34f \"u14_34f=0x340,0x330,lc:y,tm:0,mq:4\"");
MODULE_AUTHOR("Dario Ballabio");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("UltraStor 14F/34F SCSI Driver");

#endif

static int u14_34f_slave_configure(struct scsi_device *dev) {
   int j, tqd, utqd;
   char *tag_suffix, *link_suffix;
   struct Scsi_Host *host = dev->host;

   j = ((struct hostdata *) host->hostdata)->board_number;

   utqd = MAX_CMD_PER_LUN;
   tqd = max_queue_depth;

   if (TLDEV(dev->type) && dev->tagged_supported)

      if (tag_mode == TAG_SIMPLE) {
         scsi_change_queue_depth(dev, tqd);
         tag_suffix = ", simple tags";
         }
      else if (tag_mode == TAG_ORDERED) {
         scsi_change_queue_depth(dev, tqd);
         tag_suffix = ", ordered tags";
         }
      else {
         scsi_change_queue_depth(dev, tqd);
         tag_suffix = ", no tags";
         }

   else if (TLDEV(dev->type) && linked_comm) {
      scsi_change_queue_depth(dev, tqd);
      tag_suffix = ", untagged";
      }

   else {
      scsi_change_queue_depth(dev, utqd);
      tag_suffix = "";
      }

   if (TLDEV(dev->type) && linked_comm && dev->queue_depth > 2)
      link_suffix = ", sorted";
   else if (TLDEV(dev->type))
      link_suffix = ", unsorted";
   else
      link_suffix = "";

   sdev_printk(KERN_INFO, dev, "cmds/lun %d%s%s.\n",
          dev->queue_depth, link_suffix, tag_suffix);

   return FALSE;
}

static int wait_on_busy(unsigned long iobase, unsigned int loop) {

   while (inb(iobase + REG_LCL_INTR) & BSY_ASSERTED) {
      udelay(1L);
      if (--loop == 0) return TRUE;
      }

   return FALSE;
}

static int board_inquiry(unsigned int j) {
   struct mscp *cpp;
   dma_addr_t id_dma_addr;
   unsigned int limit = 0;
   unsigned long time;

   id_dma_addr = pci_map_single(HD(j)->pdev, HD(j)->board_id,
                    sizeof(HD(j)->board_id), PCI_DMA_BIDIRECTIONAL);
   cpp = &HD(j)->cp[0];
   cpp->cp_dma_addr = pci_map_single(HD(j)->pdev, cpp, sizeof(struct mscp),
                                     PCI_DMA_BIDIRECTIONAL);
   memset(cpp, 0, sizeof(struct mscp) - CP_TAIL_SIZE);
   cpp->opcode = OP_HOST_ADAPTER;
   cpp->xdir = DTD_IN;
   cpp->data_address = H2DEV(id_dma_addr);
   cpp->data_len = H2DEV(sizeof(HD(j)->board_id));
   cpp->cdb_len = 6;
   cpp->cdb[0] = HA_CMD_INQUIRY;

   if (wait_on_busy(sh[j]->io_port, MAXLOOP)) {
      printk("%s: board_inquiry, adapter busy.\n", BN(j));
      return TRUE;
      }

   HD(j)->cp_stat[0] = IGNORE;

   /* Clear the interrupt indication */
   outb(CMD_CLR_INTR, sh[j]->io_port + REG_SYS_INTR);

   /* Store pointer in OGM address bytes */
   outl(H2DEV(cpp->cp_dma_addr), sh[j]->io_port + REG_OGM);

   /* Issue OGM interrupt */
   outb(CMD_OGM_INTR, sh[j]->io_port + REG_LCL_INTR);

   spin_unlock_irq(&driver_lock);
   time = jiffies;
   while ((jiffies - time) < HZ && limit++ < 20000) udelay(100L);
   spin_lock_irq(&driver_lock);

   if (cpp->adapter_status || HD(j)->cp_stat[0] != FREE) {
      HD(j)->cp_stat[0] = FREE;
      printk("%s: board_inquiry, err 0x%x.\n", BN(j), cpp->adapter_status);
      return TRUE;
      }

   pci_unmap_single(HD(j)->pdev, cpp->cp_dma_addr, sizeof(struct mscp),
                    PCI_DMA_BIDIRECTIONAL);
   pci_unmap_single(HD(j)->pdev, id_dma_addr, sizeof(HD(j)->board_id),
                    PCI_DMA_BIDIRECTIONAL);
   return FALSE;
}

static int port_detect \
      (unsigned long port_base, unsigned int j, struct scsi_host_template *tpnt) {
   unsigned char irq, dma_channel, subversion, i;
   unsigned char in_byte;
   char *bus_type, dma_name[16];

   /* Allowed BIOS base addresses (NULL indicates reserved) */
   unsigned long bios_segment_table[8] = {
      0,
      0xc4000, 0xc8000, 0xcc000, 0xd0000,
      0xd4000, 0xd8000, 0xdc000
      };

   /* Allowed IRQs */
   unsigned char interrupt_table[4] = { 15, 14, 11, 10 };

   /* Allowed DMA channels for ISA (0 indicates reserved) */
   unsigned char dma_channel_table[4] = { 5, 6, 7, 0 };

   /* Head/sector mappings */
   struct {
      unsigned char heads;
      unsigned char sectors;
      } mapping_table[4] = {
           { 16, 63 }, { 64, 32 }, { 64, 63 }, { 64, 32 }
           };

   struct config_1 {

#if defined(__BIG_ENDIAN_BITFIELD)
      unsigned char dma_channel: 2, interrupt:2,
                    removable_disks_as_fixed:1, bios_segment: 3;
#else
      unsigned char bios_segment: 3, removable_disks_as_fixed: 1,
                    interrupt: 2, dma_channel: 2;
#endif

      } config_1;

   struct config_2 {

#if defined(__BIG_ENDIAN_BITFIELD)
      unsigned char tfr_port: 2, bios_drive_number: 1,
                    mapping_mode: 2, ha_scsi_id: 3;
#else
      unsigned char ha_scsi_id: 3, mapping_mode: 2,
                    bios_drive_number: 1, tfr_port: 2;
#endif

      } config_2;

   char name[16];

   sprintf(name, "%s%d", driver_name, j);

   if (!request_region(port_base, REGION_SIZE, driver_name)) {
#if defined(DEBUG_DETECT)
      printk("%s: address 0x%03lx in use, skipping probe.\n", name, port_base);
#endif
      goto fail;
      }

   spin_lock_irq(&driver_lock);

   if (inb(port_base + REG_PRODUCT_ID1) != PRODUCT_ID1) goto freelock;

   in_byte = inb(port_base + REG_PRODUCT_ID2);

   if ((in_byte & 0xf0) != PRODUCT_ID2) goto freelock;

   *(char *)&config_1 = inb(port_base + REG_CONFIG1);
   *(char *)&config_2 = inb(port_base + REG_CONFIG2);

   irq = interrupt_table[config_1.interrupt];
   dma_channel = dma_channel_table[config_1.dma_channel];
   subversion = (in_byte & 0x0f);

   /* Board detected, allocate its IRQ */
   if (request_irq(irq, do_interrupt_handler,
             (subversion == ESA) ? IRQF_SHARED : 0,
             driver_name, (void *) &sha[j])) {
      printk("%s: unable to allocate IRQ %u, detaching.\n", name, irq);
      goto freelock;
      }

   if (subversion == ISA && request_dma(dma_channel, driver_name)) {
      printk("%s: unable to allocate DMA channel %u, detaching.\n",
             name, dma_channel);
      goto freeirq;
      }

   if (have_old_firmware) tpnt->use_clustering = DISABLE_CLUSTERING;

   spin_unlock_irq(&driver_lock);
   sh[j] = scsi_register(tpnt, sizeof(struct hostdata));
   spin_lock_irq(&driver_lock);

   if (sh[j] == NULL) {
      printk("%s: unable to register host, detaching.\n", name);
      goto freedma;
      }

   sh[j]->io_port = port_base;
   sh[j]->unique_id = port_base;
   sh[j]->n_io_port = REGION_SIZE;
   sh[j]->base = bios_segment_table[config_1.bios_segment];
   sh[j]->irq = irq;
   sh[j]->sg_tablesize = MAX_SGLIST;
   sh[j]->this_id = config_2.ha_scsi_id;
   sh[j]->can_queue = MAX_MAILBOXES;
   sh[j]->cmd_per_lun = MAX_CMD_PER_LUN;

#if defined(DEBUG_DETECT)
   {
   unsigned char sys_mask, lcl_mask;

   sys_mask = inb(sh[j]->io_port + REG_SYS_MASK);
   lcl_mask = inb(sh[j]->io_port + REG_LCL_MASK);
   printk("SYS_MASK 0x%x, LCL_MASK 0x%x.\n", sys_mask, lcl_mask);
   }
#endif

   /* Probably a bogus host scsi id, set it to the dummy value */
   if (sh[j]->this_id == 0) sh[j]->this_id = -1;

   /* If BIOS is disabled, force enable interrupts */
   if (sh[j]->base == 0) outb(CMD_ENA_INTR, sh[j]->io_port + REG_SYS_MASK);

   memset(HD(j), 0, sizeof(struct hostdata));
   HD(j)->heads = mapping_table[config_2.mapping_mode].heads;
   HD(j)->sectors = mapping_table[config_2.mapping_mode].sectors;
   HD(j)->subversion = subversion;
   HD(j)->pdev = NULL;
   HD(j)->board_number = j;

   if (have_old_firmware) sh[j]->sg_tablesize = MAX_SAFE_SGLIST;

   if (HD(j)->subversion == ESA) {
      sh[j]->unchecked_isa_dma = FALSE;
      sh[j]->dma_channel = NO_DMA;
      sprintf(BN(j), "U34F%d", j);
      bus_type = "VESA";
      }
   else {
      unsigned long flags;
      sh[j]->unchecked_isa_dma = TRUE;

      flags=claim_dma_lock();
      disable_dma(dma_channel);
      clear_dma_ff(dma_channel);
      set_dma_mode(dma_channel, DMA_MODE_CASCADE);
      enable_dma(dma_channel);
      release_dma_lock(flags);

      sh[j]->dma_channel = dma_channel;
      sprintf(BN(j), "U14F%d", j);
      bus_type = "ISA";
      }

   sh[j]->max_channel = MAX_CHANNEL - 1;
   sh[j]->max_id = MAX_TARGET;
   sh[j]->max_lun = MAX_LUN;

   if (HD(j)->subversion == ISA && !board_inquiry(j)) {
      HD(j)->board_id[40] = 0;

      if (strcmp(&HD(j)->board_id[32], "06000600")) {
         printk("%s: %s.\n", BN(j), &HD(j)->board_id[8]);
         printk("%s: firmware %s is outdated, FW PROM should be 28004-006.\n",
                BN(j), &HD(j)->board_id[32]);
         sh[j]->hostt->use_clustering = DISABLE_CLUSTERING;
         sh[j]->sg_tablesize = MAX_SAFE_SGLIST;
         }
      }

   if (dma_channel == NO_DMA) sprintf(dma_name, "%s", "BMST");
   else                       sprintf(dma_name, "DMA %u", dma_channel);

   spin_unlock_irq(&driver_lock);

   for (i = 0; i < sh[j]->can_queue; i++)
      HD(j)->cp[i].cp_dma_addr = pci_map_single(HD(j)->pdev,
            &HD(j)->cp[i], sizeof(struct mscp), PCI_DMA_BIDIRECTIONAL);

   for (i = 0; i < sh[j]->can_queue; i++)
      if (! ((&HD(j)->cp[i])->sglist = kmalloc(
            sh[j]->sg_tablesize * sizeof(struct sg_list),
            (sh[j]->unchecked_isa_dma ? GFP_DMA : 0) | GFP_ATOMIC))) {
         printk("%s: kmalloc SGlist failed, mbox %d, detaching.\n", BN(j), i);
         goto release;
         }

   if (max_queue_depth > MAX_TAGGED_CMD_PER_LUN)
       max_queue_depth = MAX_TAGGED_CMD_PER_LUN;

   if (max_queue_depth < MAX_CMD_PER_LUN) max_queue_depth = MAX_CMD_PER_LUN;

   if (tag_mode != TAG_DISABLED && tag_mode != TAG_SIMPLE)
      tag_mode = TAG_ORDERED;

   if (j == 0) {
      printk("UltraStor 14F/34F: Copyright (C) 1994-2003 Dario Ballabio.\n");
      printk("%s config options -> of:%c, tm:%d, lc:%c, mq:%d, et:%c.\n",
             driver_name, YESNO(have_old_firmware), tag_mode,
             YESNO(linked_comm), max_queue_depth, YESNO(ext_tran));
      }

   printk("%s: %s 0x%03lx, BIOS 0x%05x, IRQ %u, %s, SG %d, MB %d.\n",
          BN(j), bus_type, (unsigned long)sh[j]->io_port, (int)sh[j]->base,
          sh[j]->irq, dma_name, sh[j]->sg_tablesize, sh[j]->can_queue);

   if (sh[j]->max_id > 8 || sh[j]->max_lun > 8)
      printk("%s: wide SCSI support enabled, max_id %u, max_lun %llu.\n",
             BN(j), sh[j]->max_id, sh[j]->max_lun);

   for (i = 0; i <= sh[j]->max_channel; i++)
      printk("%s: SCSI channel %u enabled, host target ID %d.\n",
             BN(j), i, sh[j]->this_id);

   return TRUE;

freedma:
   if (subversion == ISA) free_dma(dma_channel);
freeirq:
   free_irq(irq, &sha[j]);
freelock:
   spin_unlock_irq(&driver_lock);
   release_region(port_base, REGION_SIZE);
fail:
   return FALSE;

release:
   u14_34f_release(sh[j]);
   return FALSE;
}

static void internal_setup(char *str, int *ints) {
   int i, argc = ints[0];
   char *cur = str, *pc;

   if (argc > 0) {

      if (argc > MAX_INT_PARAM) argc = MAX_INT_PARAM;

      for (i = 0; i < argc; i++) io_port[i] = ints[i + 1];

      io_port[i] = 0;
      setup_done = TRUE;
      }

   while (cur && (pc = strchr(cur, ':'))) {
      int val = 0, c = *++pc;

      if (c == 'n' || c == 'N') val = FALSE;
      else if (c == 'y' || c == 'Y') val = TRUE;
      else val = (int) simple_strtoul(pc, NULL, 0);

      if (!strncmp(cur, "lc:", 3)) linked_comm = val;
      else if (!strncmp(cur, "of:", 3)) have_old_firmware = val;
      else if (!strncmp(cur, "tm:", 3)) tag_mode = val;
      else if (!strncmp(cur, "tc:", 3)) tag_mode = val;
      else if (!strncmp(cur, "mq:", 3))  max_queue_depth = val;
      else if (!strncmp(cur, "ls:", 3))  link_statistics = val;
      else if (!strncmp(cur, "et:", 3))  ext_tran = val;

      if ((cur = strchr(cur, ','))) ++cur;
      }

   return;
}

static int option_setup(char *str) {
   int ints[MAX_INT_PARAM];
   char *cur = str;
   int i = 1;

   while (cur && isdigit(*cur) && i < MAX_INT_PARAM) {
      ints[i++] = simple_strtoul(cur, NULL, 0);

      if ((cur = strchr(cur, ',')) != NULL) cur++;
   }

   ints[0] = i - 1;
   internal_setup(cur, ints);
   return 1;
}

static int u14_34f_detect(struct scsi_host_template *tpnt) {
   unsigned int j = 0, k;

   tpnt->proc_name = "u14-34f";

   if(strlen(boot_options)) option_setup(boot_options);

#if defined(MODULE)
   /* io_port could have been modified when loading as a module */
   if(io_port[0] != SKIP) {
      setup_done = TRUE;
      io_port[MAX_INT_PARAM] = 0;
      }
#endif

   for (k = 0; k < MAX_BOARDS + 1; k++) sh[k] = NULL;

   for (k = 0; io_port[k]; k++) {

      if (io_port[k] == SKIP) continue;

      if (j < MAX_BOARDS && port_detect(io_port[k], j, tpnt)) j++;
      }

   num_boards = j;
   return j;
}

static void map_dma(unsigned int i, unsigned int j) {
   unsigned int data_len = 0;
   unsigned int k, pci_dir;
   int count;
   struct scatterlist *sg;
   struct mscp *cpp;
   struct scsi_cmnd *SCpnt;

   cpp = &HD(j)->cp[i]; SCpnt = cpp->SCpnt;
   pci_dir = SCpnt->sc_data_direction;

   if (SCpnt->sense_buffer)
      cpp->sense_addr = H2DEV(pci_map_single(HD(j)->pdev, SCpnt->sense_buffer,
                           SCSI_SENSE_BUFFERSIZE, PCI_DMA_FROMDEVICE));

   cpp->sense_len = SCSI_SENSE_BUFFERSIZE;

   if (scsi_bufflen(SCpnt)) {
	   count = scsi_dma_map(SCpnt);
	   BUG_ON(count < 0);

	   scsi_for_each_sg(SCpnt, sg, count, k) {
		   cpp->sglist[k].address = H2DEV(sg_dma_address(sg));
		   cpp->sglist[k].num_bytes = H2DEV(sg_dma_len(sg));
		   data_len += sg->length;
	   }

	   cpp->sg = TRUE;
	   cpp->use_sg = scsi_sg_count(SCpnt);
	   cpp->data_address =
		   H2DEV(pci_map_single(HD(j)->pdev, cpp->sglist,
					cpp->use_sg * sizeof(struct sg_list),
					pci_dir));
	   cpp->data_len = H2DEV(data_len);

   } else {
	   pci_dir = PCI_DMA_BIDIRECTIONAL;
	   cpp->data_len = H2DEV(scsi_bufflen(SCpnt));
   }
}

static void unmap_dma(unsigned int i, unsigned int j) {
   unsigned int pci_dir;
   struct mscp *cpp;
   struct scsi_cmnd *SCpnt;

   cpp = &HD(j)->cp[i]; SCpnt = cpp->SCpnt;
   pci_dir = SCpnt->sc_data_direction;

   if (DEV2H(cpp->sense_addr))
      pci_unmap_single(HD(j)->pdev, DEV2H(cpp->sense_addr),
                       DEV2H(cpp->sense_len), PCI_DMA_FROMDEVICE);

   scsi_dma_unmap(SCpnt);

   if (!DEV2H(cpp->data_len)) pci_dir = PCI_DMA_BIDIRECTIONAL;

   if (DEV2H(cpp->data_address))
      pci_unmap_single(HD(j)->pdev, DEV2H(cpp->data_address),
                       DEV2H(cpp->data_len), pci_dir);
}

static void sync_dma(unsigned int i, unsigned int j) {
   unsigned int pci_dir;
   struct mscp *cpp;
   struct scsi_cmnd *SCpnt;

   cpp = &HD(j)->cp[i]; SCpnt = cpp->SCpnt;
   pci_dir = SCpnt->sc_data_direction;

   if (DEV2H(cpp->sense_addr))
      pci_dma_sync_single_for_cpu(HD(j)->pdev, DEV2H(cpp->sense_addr),
                          DEV2H(cpp->sense_len), PCI_DMA_FROMDEVICE);

   if (scsi_sg_count(SCpnt))
	   pci_dma_sync_sg_for_cpu(HD(j)->pdev, scsi_sglist(SCpnt),
				   scsi_sg_count(SCpnt), pci_dir);

   if (!DEV2H(cpp->data_len)) pci_dir = PCI_DMA_BIDIRECTIONAL;

   if (DEV2H(cpp->data_address))
      pci_dma_sync_single_for_cpu(HD(j)->pdev, DEV2H(cpp->data_address),
                       DEV2H(cpp->data_len), pci_dir);
}

static void scsi_to_dev_dir(unsigned int i, unsigned int j) {
   unsigned int k;

   static const unsigned char data_out_cmds[] = {
      0x0a, 0x2a, 0x15, 0x55, 0x04, 0x07, 0x18, 0x1d, 0x24, 0x2e,
      0x30, 0x31, 0x32, 0x38, 0x39, 0x3a, 0x3b, 0x3d, 0x3f, 0x40,
      0x41, 0x4c, 0xaa, 0xae, 0xb0, 0xb1, 0xb2, 0xb6, 0xea, 0x1b, 0x5d
      };

   static const unsigned char data_none_cmds[] = {
      0x01, 0x0b, 0x10, 0x11, 0x13, 0x16, 0x17, 0x19, 0x2b, 0x1e,
      0x2c, 0xac, 0x2f, 0xaf, 0x33, 0xb3, 0x35, 0x36, 0x45, 0x47,
      0x48, 0x49, 0xa9, 0x4b, 0xa5, 0xa6, 0xb5, 0x00
      };

   struct mscp *cpp;
   struct scsi_cmnd *SCpnt;

   cpp = &HD(j)->cp[i]; SCpnt = cpp->SCpnt;

   if (SCpnt->sc_data_direction == DMA_FROM_DEVICE) {
      cpp->xdir = DTD_IN;
      return;
      }
   else if (SCpnt->sc_data_direction == DMA_TO_DEVICE) {
      cpp->xdir = DTD_OUT;
      return;
      }
   else if (SCpnt->sc_data_direction == DMA_NONE) {
      cpp->xdir = DTD_NONE;
      return;
      }

   if (SCpnt->sc_data_direction != DMA_BIDIRECTIONAL)
      panic("%s: qcomm, invalid SCpnt->sc_data_direction.\n", BN(j));

   cpp->xdir = DTD_IN;

   for (k = 0; k < ARRAY_SIZE(data_out_cmds); k++)
      if (SCpnt->cmnd[0] == data_out_cmds[k]) {
         cpp->xdir = DTD_OUT;
         break;
         }

   if (cpp->xdir == DTD_IN)
      for (k = 0; k < ARRAY_SIZE(data_none_cmds); k++)
         if (SCpnt->cmnd[0] == data_none_cmds[k]) {
            cpp->xdir = DTD_NONE;
            break;
            }

}

static int u14_34f_queuecommand_lck(struct scsi_cmnd *SCpnt, void (*done)(struct scsi_cmnd *)) {
   unsigned int i, j, k;
   struct mscp *cpp;

   /* j is the board number */
   j = ((struct hostdata *) SCpnt->device->host->hostdata)->board_number;

   if (SCpnt->host_scribble)
      panic("%s: qcomm, SCpnt %p already active.\n",
            BN(j), SCpnt);

   /* i is the mailbox number, look for the first free mailbox
      starting from last_cp_used */
   i = HD(j)->last_cp_used + 1;

   for (k = 0; k < sh[j]->can_queue; k++, i++) {

      if (i >= sh[j]->can_queue) i = 0;

      if (HD(j)->cp_stat[i] == FREE) {
         HD(j)->last_cp_used = i;
         break;
         }
      }

   if (k == sh[j]->can_queue) {
      printk("%s: qcomm, no free mailbox.\n", BN(j));
      return 1;
      }

   /* Set pointer to control packet structure */
   cpp = &HD(j)->cp[i];

   memset(cpp, 0, sizeof(struct mscp) - CP_TAIL_SIZE);
   SCpnt->scsi_done = done;
   cpp->cpp_index = i;
   SCpnt->host_scribble = (unsigned char *) &cpp->cpp_index;

   if (do_trace) printk("%s: qcomm, mbox %d, target %d.%d:%u.\n",
                        BN(j), i, SCpnt->device->channel, SCpnt->device->id,
                        (u8)SCpnt->device->lun);

   cpp->opcode = OP_SCSI;
   cpp->channel = SCpnt->device->channel;
   cpp->target = SCpnt->device->id;
   cpp->lun = (u8)SCpnt->device->lun;
   cpp->SCpnt = SCpnt;
   cpp->cdb_len = SCpnt->cmd_len;
   memcpy(cpp->cdb, SCpnt->cmnd, SCpnt->cmd_len);

   /* Use data transfer direction SCpnt->sc_data_direction */
   scsi_to_dev_dir(i, j);

   /* Map DMA buffers and SG list */
   map_dma(i, j);

   if (linked_comm && SCpnt->device->queue_depth > 2
                                     && TLDEV(SCpnt->device->type)) {
      HD(j)->cp_stat[i] = READY;
      flush_dev(SCpnt->device, blk_rq_pos(SCpnt->request), j, FALSE);
      return 0;
      }

   if (wait_on_busy(sh[j]->io_port, MAXLOOP)) {
      unmap_dma(i, j);
      SCpnt->host_scribble = NULL;
      scmd_printk(KERN_INFO, SCpnt,
      		"qcomm, adapter busy.\n");
      return 1;
      }

   /* Store pointer in OGM address bytes */
   outl(H2DEV(cpp->cp_dma_addr), sh[j]->io_port + REG_OGM);

   /* Issue OGM interrupt */
   outb(CMD_OGM_INTR, sh[j]->io_port + REG_LCL_INTR);

   HD(j)->cp_stat[i] = IN_USE;
   return 0;
}

static DEF_SCSI_QCMD(u14_34f_queuecommand)

static int u14_34f_eh_abort(struct scsi_cmnd *SCarg) {
   unsigned int i, j;

   j = ((struct hostdata *) SCarg->device->host->hostdata)->board_number;

   if (SCarg->host_scribble == NULL) {
      scmd_printk(KERN_INFO, SCarg, "abort, command inactive.\n");
      return SUCCESS;
      }

   i = *(unsigned int *)SCarg->host_scribble;
   scmd_printk(KERN_INFO, SCarg, "abort, mbox %d.\n", i);

   if (i >= sh[j]->can_queue)
      panic("%s: abort, invalid SCarg->host_scribble.\n", BN(j));

   if (wait_on_busy(sh[j]->io_port, MAXLOOP)) {
      printk("%s: abort, timeout error.\n", BN(j));
      return FAILED;
      }

   if (HD(j)->cp_stat[i] == FREE) {
      printk("%s: abort, mbox %d is free.\n", BN(j), i);
      return SUCCESS;
      }

   if (HD(j)->cp_stat[i] == IN_USE) {
      printk("%s: abort, mbox %d is in use.\n", BN(j), i);

      if (SCarg != HD(j)->cp[i].SCpnt)
         panic("%s: abort, mbox %d, SCarg %p, cp SCpnt %p.\n",
               BN(j), i, SCarg, HD(j)->cp[i].SCpnt);

      if (inb(sh[j]->io_port + REG_SYS_INTR) & IRQ_ASSERTED)
         printk("%s: abort, mbox %d, interrupt pending.\n", BN(j), i);

      return FAILED;
      }

   if (HD(j)->cp_stat[i] == IN_RESET) {
      printk("%s: abort, mbox %d is in reset.\n", BN(j), i);
      return FAILED;
      }

   if (HD(j)->cp_stat[i] == LOCKED) {
      printk("%s: abort, mbox %d is locked.\n", BN(j), i);
      return SUCCESS;
      }

   if (HD(j)->cp_stat[i] == READY || HD(j)->cp_stat[i] == ABORTING) {
      unmap_dma(i, j);
      SCarg->result = DID_ABORT << 16;
      SCarg->host_scribble = NULL;
      HD(j)->cp_stat[i] = FREE;
      printk("%s, abort, mbox %d ready, DID_ABORT, done.\n", BN(j), i);
      SCarg->scsi_done(SCarg);
      return SUCCESS;
      }

   panic("%s: abort, mbox %d, invalid cp_stat.\n", BN(j), i);
}

static int u14_34f_eh_host_reset(struct scsi_cmnd *SCarg) {
   unsigned int i, j, k, c, limit = 0;
   unsigned long time;
   int arg_done = FALSE;
   struct scsi_cmnd *SCpnt;

   j = ((struct hostdata *) SCarg->device->host->hostdata)->board_number;
   scmd_printk(KERN_INFO, SCarg, "reset, enter.\n");

   spin_lock_irq(sh[j]->host_lock);

   if (SCarg->host_scribble == NULL)
      printk("%s: reset, inactive.\n", BN(j));

   if (HD(j)->in_reset) {
      printk("%s: reset, exit, already in reset.\n", BN(j));
      spin_unlock_irq(sh[j]->host_lock);
      return FAILED;
      }

   if (wait_on_busy(sh[j]->io_port, MAXLOOP)) {
      printk("%s: reset, exit, timeout error.\n", BN(j));
      spin_unlock_irq(sh[j]->host_lock);
      return FAILED;
      }

   HD(j)->retries = 0;

   for (c = 0; c <= sh[j]->max_channel; c++)
      for (k = 0; k < sh[j]->max_id; k++) {
         HD(j)->target_redo[k][c] = TRUE;
         HD(j)->target_to[k][c] = 0;
         }

   for (i = 0; i < sh[j]->can_queue; i++) {

      if (HD(j)->cp_stat[i] == FREE) continue;

      if (HD(j)->cp_stat[i] == LOCKED) {
         HD(j)->cp_stat[i] = FREE;
         printk("%s: reset, locked mbox %d forced free.\n", BN(j), i);
         continue;
         }

      if (!(SCpnt = HD(j)->cp[i].SCpnt))
         panic("%s: reset, mbox %d, SCpnt == NULL.\n", BN(j), i);

      if (HD(j)->cp_stat[i] == READY || HD(j)->cp_stat[i] == ABORTING) {
         HD(j)->cp_stat[i] = ABORTING;
         printk("%s: reset, mbox %d aborting.\n", BN(j), i);
         }

      else {
         HD(j)->cp_stat[i] = IN_RESET;
         printk("%s: reset, mbox %d in reset.\n", BN(j), i);
         }

      if (SCpnt->host_scribble == NULL)
         panic("%s: reset, mbox %d, garbled SCpnt.\n", BN(j), i);

      if (*(unsigned int *)SCpnt->host_scribble != i)
         panic("%s: reset, mbox %d, index mismatch.\n", BN(j), i);

      if (SCpnt->scsi_done == NULL)
         panic("%s: reset, mbox %d, SCpnt->scsi_done == NULL.\n", BN(j), i);

      if (SCpnt == SCarg) arg_done = TRUE;
      }

   if (wait_on_busy(sh[j]->io_port, MAXLOOP)) {
      printk("%s: reset, cannot reset, timeout error.\n", BN(j));
      spin_unlock_irq(sh[j]->host_lock);
      return FAILED;
      }

   outb(CMD_RESET, sh[j]->io_port + REG_LCL_INTR);
   printk("%s: reset, board reset done, enabling interrupts.\n", BN(j));

#if defined(DEBUG_RESET)
   do_trace = TRUE;
#endif

   HD(j)->in_reset = TRUE;

   spin_unlock_irq(sh[j]->host_lock);
   time = jiffies;
   while ((jiffies - time) < (10 * HZ) && limit++ < 200000) udelay(100L);
   spin_lock_irq(sh[j]->host_lock);

   printk("%s: reset, interrupts disabled, loops %d.\n", BN(j), limit);

   for (i = 0; i < sh[j]->can_queue; i++) {

      if (HD(j)->cp_stat[i] == IN_RESET) {
         SCpnt = HD(j)->cp[i].SCpnt;
         unmap_dma(i, j);
         SCpnt->result = DID_RESET << 16;
         SCpnt->host_scribble = NULL;

         /* This mailbox is still waiting for its interrupt */
         HD(j)->cp_stat[i] = LOCKED;

         printk("%s, reset, mbox %d locked, DID_RESET, done.\n", BN(j), i);
         }

      else if (HD(j)->cp_stat[i] == ABORTING) {
         SCpnt = HD(j)->cp[i].SCpnt;
         unmap_dma(i, j);
         SCpnt->result = DID_RESET << 16;
         SCpnt->host_scribble = NULL;

         /* This mailbox was never queued to the adapter */
         HD(j)->cp_stat[i] = FREE;

         printk("%s, reset, mbox %d aborting, DID_RESET, done.\n", BN(j), i);
         }

      else

         /* Any other mailbox has already been set free by interrupt */
         continue;

      SCpnt->scsi_done(SCpnt);
      }

   HD(j)->in_reset = FALSE;
   do_trace = FALSE;

   if (arg_done) printk("%s: reset, exit, done.\n", BN(j));
   else          printk("%s: reset, exit.\n", BN(j));

   spin_unlock_irq(sh[j]->host_lock);
   return SUCCESS;
}

static int u14_34f_bios_param(struct scsi_device *disk,
                 struct block_device *bdev, sector_t capacity, int *dkinfo) {
   unsigned int j = 0;
   unsigned int size = capacity;

   dkinfo[0] = HD(j)->heads;
   dkinfo[1] = HD(j)->sectors;
   dkinfo[2] = size / (HD(j)->heads * HD(j)->sectors);

   if (ext_tran && (scsicam_bios_param(bdev, capacity, dkinfo) < 0)) {
      dkinfo[0] = 255;
      dkinfo[1] = 63;
      dkinfo[2] = size / (dkinfo[0] * dkinfo[1]);
      }

#if defined (DEBUG_GEOMETRY)
   printk ("%s: bios_param, head=%d, sec=%d, cyl=%d.\n", driver_name,
           dkinfo[0], dkinfo[1], dkinfo[2]);
#endif

   return FALSE;
}

static void sort(unsigned long sk[], unsigned int da[], unsigned int n,
                 unsigned int rev) {
   unsigned int i, j, k, y;
   unsigned long x;

   for (i = 0; i < n - 1; i++) {
      k = i;

      for (j = k + 1; j < n; j++)
         if (rev) {
            if (sk[j] > sk[k]) k = j;
            }
         else {
            if (sk[j] < sk[k]) k = j;
            }

      if (k != i) {
         x = sk[k]; sk[k] = sk[i]; sk[i] = x;
         y = da[k]; da[k] = da[i]; da[i] = y;
         }
      }

   return;
   }

static int reorder(unsigned int j, unsigned long cursec,
                 unsigned int ihdlr, unsigned int il[], unsigned int n_ready) {
   struct scsi_cmnd *SCpnt;
   struct mscp *cpp;
   unsigned int k, n;
   unsigned int rev = FALSE, s = TRUE, r = TRUE;
   unsigned int input_only = TRUE, overlap = FALSE;
   unsigned long sl[n_ready], pl[n_ready], ll[n_ready];
   unsigned long maxsec = 0, minsec = ULONG_MAX, seek = 0, iseek = 0;
   unsigned long ioseek = 0;

   static unsigned int flushcount = 0, batchcount = 0, sortcount = 0;
   static unsigned int readycount = 0, ovlcount = 0, inputcount = 0;
   static unsigned int readysorted = 0, revcount = 0;
   static unsigned long seeksorted = 0, seeknosort = 0;

   if (link_statistics && !(++flushcount % link_statistics))
      printk("fc %d bc %d ic %d oc %d rc %d rs %d sc %d re %d"\
             " av %ldK as %ldK.\n", flushcount, batchcount, inputcount,
             ovlcount, readycount, readysorted, sortcount, revcount,
             seeknosort / (readycount + 1),
             seeksorted / (readycount + 1));

   if (n_ready <= 1) return FALSE;

   for (n = 0; n < n_ready; n++) {
      k = il[n]; cpp = &HD(j)->cp[k]; SCpnt = cpp->SCpnt;

      if (!(cpp->xdir == DTD_IN)) input_only = FALSE;

      if (blk_rq_pos(SCpnt->request) < minsec)
	 minsec = blk_rq_pos(SCpnt->request);
      if (blk_rq_pos(SCpnt->request) > maxsec)
	 maxsec = blk_rq_pos(SCpnt->request);

      sl[n] = blk_rq_pos(SCpnt->request);
      ioseek += blk_rq_sectors(SCpnt->request);

      if (!n) continue;

      if (sl[n] < sl[n - 1]) s = FALSE;
      if (sl[n] > sl[n - 1]) r = FALSE;

      if (link_statistics) {
         if (sl[n] > sl[n - 1])
            seek += sl[n] - sl[n - 1];
         else
            seek += sl[n - 1] - sl[n];
         }

      }

   if (link_statistics) {
      if (cursec > sl[0]) seek += cursec - sl[0]; else seek += sl[0] - cursec;
      }

   if (cursec > ((maxsec + minsec) / 2)) rev = TRUE;

   if (ioseek > ((maxsec - minsec) / 2)) rev = FALSE;

   if (!((rev && r) || (!rev && s))) sort(sl, il, n_ready, rev);

   if (!input_only) for (n = 0; n < n_ready; n++) {
      k = il[n]; cpp = &HD(j)->cp[k]; SCpnt = cpp->SCpnt;
      ll[n] = blk_rq_sectors(SCpnt->request); pl[n] = SCpnt->serial_number;

      if (!n) continue;

      if ((sl[n] == sl[n - 1]) || (!rev && ((sl[n - 1] + ll[n - 1]) > sl[n]))
          || (rev && ((sl[n] + ll[n]) > sl[n - 1]))) overlap = TRUE;
      }

   if (overlap) sort(pl, il, n_ready, FALSE);

   if (link_statistics) {
      if (cursec > sl[0]) iseek = cursec - sl[0]; else iseek = sl[0] - cursec;
      batchcount++; readycount += n_ready; seeknosort += seek / 1024;
      if (input_only) inputcount++;
      if (overlap) { ovlcount++; seeksorted += iseek / 1024; }
      else seeksorted += (iseek + maxsec - minsec) / 1024;
      if (rev && !r)     {  revcount++; readysorted += n_ready; }
      if (!rev && !s)    { sortcount++; readysorted += n_ready; }
      }

#if defined(DEBUG_LINKED_COMMANDS)
   if (link_statistics && (overlap || !(flushcount % link_statistics)))
      for (n = 0; n < n_ready; n++) {
         k = il[n]; cpp = &HD(j)->cp[k]; SCpnt = cpp->SCpnt;
         printk("%s %d.%d:%llu mb %d fc %d nr %d sec %ld ns %u"\
                " cur %ld s:%c r:%c rev:%c in:%c ov:%c xd %d.\n",
                (ihdlr ? "ihdlr" : "qcomm"), SCpnt->channel, SCpnt->target,
                (u8)SCpnt->lun, k, flushcount, n_ready,
                blk_rq_pos(SCpnt->request), blk_rq_sectors(SCpnt->request),
		cursec, YESNO(s), YESNO(r), YESNO(rev), YESNO(input_only),
                YESNO(overlap), cpp->xdir);
         }
#endif
   return overlap;
}

static void flush_dev(struct scsi_device *dev, unsigned long cursec, unsigned int j,
                      unsigned int ihdlr) {
   struct scsi_cmnd *SCpnt;
   struct mscp *cpp;
   unsigned int k, n, n_ready = 0, il[MAX_MAILBOXES];

   for (k = 0; k < sh[j]->can_queue; k++) {

      if (HD(j)->cp_stat[k] != READY && HD(j)->cp_stat[k] != IN_USE) continue;

      cpp = &HD(j)->cp[k]; SCpnt = cpp->SCpnt;

      if (SCpnt->device != dev) continue;

      if (HD(j)->cp_stat[k] == IN_USE) return;

      il[n_ready++] = k;
      }

   if (reorder(j, cursec, ihdlr, il, n_ready)) n_ready = 1;

   for (n = 0; n < n_ready; n++) {
      k = il[n]; cpp = &HD(j)->cp[k]; SCpnt = cpp->SCpnt;

      if (wait_on_busy(sh[j]->io_port, MAXLOOP)) {
         scmd_printk(KERN_INFO, SCpnt,
	 	"%s, mbox %d, adapter"
                " busy, will abort.\n", (ihdlr ? "ihdlr" : "qcomm"),
                k);
         HD(j)->cp_stat[k] = ABORTING;
         continue;
         }

      outl(H2DEV(cpp->cp_dma_addr), sh[j]->io_port + REG_OGM);
      outb(CMD_OGM_INTR, sh[j]->io_port + REG_LCL_INTR);
      HD(j)->cp_stat[k] = IN_USE;
      }

}

static irqreturn_t ihdlr(unsigned int j)
{
   struct scsi_cmnd *SCpnt;
   unsigned int i, k, c, status, tstatus, reg, ret;
   struct mscp *spp, *cpp;
   int irq = sh[j]->irq;

   /* Check if this board need to be serviced */
   if (!((reg = inb(sh[j]->io_port + REG_SYS_INTR)) & IRQ_ASSERTED)) goto none;

   HD(j)->iocount++;

   if (do_trace) printk("%s: ihdlr, enter, irq %d, count %d.\n", BN(j), irq,
                        HD(j)->iocount);

   /* Check if this board is still busy */
   if (wait_on_busy(sh[j]->io_port, 20 * MAXLOOP)) {
      outb(CMD_CLR_INTR, sh[j]->io_port + REG_SYS_INTR);
      printk("%s: ihdlr, busy timeout error,  irq %d, reg 0x%x, count %d.\n",
             BN(j), irq, reg, HD(j)->iocount);
      goto none;
      }

   ret = inl(sh[j]->io_port + REG_ICM);

   /* Clear interrupt pending flag */
   outb(CMD_CLR_INTR, sh[j]->io_port + REG_SYS_INTR);

   /* Find the mailbox to be serviced on this board */
   for (i = 0; i < sh[j]->can_queue; i++)
      if (H2DEV(HD(j)->cp[i].cp_dma_addr) == ret) break;

   if (i >= sh[j]->can_queue)
      panic("%s: ihdlr, invalid mscp bus address %p, cp0 %p.\n", BN(j),
            (void *)ret, (void *)H2DEV(HD(j)->cp[0].cp_dma_addr));

   cpp = &(HD(j)->cp[i]);
   spp = cpp;

#if defined(DEBUG_GENERATE_ABORTS)
   if ((HD(j)->iocount > 500) && ((HD(j)->iocount % 500) < 3)) goto handled;
#endif

   if (HD(j)->cp_stat[i] == IGNORE) {
      HD(j)->cp_stat[i] = FREE;
      goto handled;
      }
   else if (HD(j)->cp_stat[i] == LOCKED) {
      HD(j)->cp_stat[i] = FREE;
      printk("%s: ihdlr, mbox %d unlocked, count %d.\n", BN(j), i,
             HD(j)->iocount);
      goto handled;
      }
   else if (HD(j)->cp_stat[i] == FREE) {
      printk("%s: ihdlr, mbox %d is free, count %d.\n", BN(j), i,
             HD(j)->iocount);
      goto handled;
      }
   else if (HD(j)->cp_stat[i] == IN_RESET)
      printk("%s: ihdlr, mbox %d is in reset.\n", BN(j), i);
   else if (HD(j)->cp_stat[i] != IN_USE)
      panic("%s: ihdlr, mbox %d, invalid cp_stat: %d.\n",
            BN(j), i, HD(j)->cp_stat[i]);

   HD(j)->cp_stat[i] = FREE;
   SCpnt = cpp->SCpnt;

   if (SCpnt == NULL) panic("%s: ihdlr, mbox %d, SCpnt == NULL.\n", BN(j), i);

   if (SCpnt->host_scribble == NULL)
      panic("%s: ihdlr, mbox %d, SCpnt %p garbled.\n", BN(j), i,
            SCpnt);

   if (*(unsigned int *)SCpnt->host_scribble != i)
      panic("%s: ihdlr, mbox %d, index mismatch %d.\n",
            BN(j), i, *(unsigned int *)SCpnt->host_scribble);

   sync_dma(i, j);

   if (linked_comm && SCpnt->device->queue_depth > 2
                                     && TLDEV(SCpnt->device->type))
      flush_dev(SCpnt->device, blk_rq_pos(SCpnt->request), j, TRUE);

   tstatus = status_byte(spp->target_status);

#if defined(DEBUG_GENERATE_ERRORS)
   if ((HD(j)->iocount > 500) && ((HD(j)->iocount % 200) < 2))
                                           spp->adapter_status = 0x01;
#endif

   switch (spp->adapter_status) {
      case ASOK:     /* status OK */

         /* Forces a reset if a disk drive keeps returning BUSY */
         if (tstatus == BUSY && SCpnt->device->type != TYPE_TAPE)
            status = DID_ERROR << 16;

         /* If there was a bus reset, redo operation on each target */
         else if (tstatus != GOOD && SCpnt->device->type == TYPE_DISK
                  && HD(j)->target_redo[scmd_id(SCpnt)][scmd_channel(SCpnt)])
            status = DID_BUS_BUSY << 16;

         /* Works around a flaw in scsi.c */
         else if (tstatus == CHECK_CONDITION
                  && SCpnt->device->type == TYPE_DISK
                  && (SCpnt->sense_buffer[2] & 0xf) == RECOVERED_ERROR)
            status = DID_BUS_BUSY << 16;

         else
            status = DID_OK << 16;

         if (tstatus == GOOD)
            HD(j)->target_redo[scmd_id(SCpnt)][scmd_channel(SCpnt)] = FALSE;

         if (spp->target_status && SCpnt->device->type == TYPE_DISK &&
             (!(tstatus == CHECK_CONDITION && HD(j)->iocount <= 1000 &&
               (SCpnt->sense_buffer[2] & 0xf) == NOT_READY)))
            scmd_printk(KERN_INFO, SCpnt,
	    	"ihdlr, target_status 0x%x, sense key 0x%x.\n",
                   spp->target_status,
                   SCpnt->sense_buffer[2]);

         HD(j)->target_to[scmd_id(SCpnt)][scmd_channel(SCpnt)] = 0;

         if (HD(j)->last_retried_pid == SCpnt->serial_number) HD(j)->retries = 0;

         break;
      case ASST:     /* Selection Time Out */

         if (HD(j)->target_to[scmd_id(SCpnt)][scmd_channel(SCpnt)] > 1)
            status = DID_ERROR << 16;
         else {
            status = DID_TIME_OUT << 16;
            HD(j)->target_to[scmd_id(SCpnt)][scmd_channel(SCpnt)]++;
            }

         break;

      /* Perform a limited number of internal retries */
      case 0x93:     /* Unexpected bus free */
      case 0x94:     /* Target bus phase sequence failure */
      case 0x96:     /* Illegal SCSI command */
      case 0xa3:     /* SCSI bus reset error */

         for (c = 0; c <= sh[j]->max_channel; c++)
            for (k = 0; k < sh[j]->max_id; k++)
               HD(j)->target_redo[k][c] = TRUE;


      case 0x92:     /* Data over/under-run */

         if (SCpnt->device->type != TYPE_TAPE
             && HD(j)->retries < MAX_INTERNAL_RETRIES) {

#if defined(DID_SOFT_ERROR)
            status = DID_SOFT_ERROR << 16;
#else
            status = DID_BUS_BUSY << 16;
#endif

            HD(j)->retries++;
            HD(j)->last_retried_pid = SCpnt->serial_number;
            }
         else
            status = DID_ERROR << 16;

         break;
      case 0x01:     /* Invalid command */
      case 0x02:     /* Invalid parameters */
      case 0x03:     /* Invalid data list */
      case 0x84:     /* SCSI bus abort error */
      case 0x9b:     /* Auto request sense error */
      case 0x9f:     /* Unexpected command complete message error */
      case 0xff:     /* Invalid parameter in the S/G list */
      default:
         status = DID_ERROR << 16;
         break;
      }

   SCpnt->result = status | spp->target_status;

#if defined(DEBUG_INTERRUPT)
   if (SCpnt->result || do_trace)
#else
   if ((spp->adapter_status != ASOK && HD(j)->iocount >  1000) ||
       (spp->adapter_status != ASOK &&
        spp->adapter_status != ASST && HD(j)->iocount <= 1000) ||
        do_trace || msg_byte(spp->target_status))
#endif
      scmd_printk(KERN_INFO, SCpnt, "ihdlr, mbox %2d, err 0x%x:%x,"\
             " reg 0x%x, count %d.\n",
             i, spp->adapter_status, spp->target_status,
             reg, HD(j)->iocount);

   unmap_dma(i, j);

   /* Set the command state to inactive */
   SCpnt->host_scribble = NULL;

   SCpnt->scsi_done(SCpnt);

   if (do_trace) printk("%s: ihdlr, exit, irq %d, count %d.\n", BN(j), irq,
                        HD(j)->iocount);

handled:
   return IRQ_HANDLED;
none:
   return IRQ_NONE;
}

static irqreturn_t do_interrupt_handler(int irq, void *shap) {
   unsigned int j;
   unsigned long spin_flags;
   irqreturn_t ret;

   /* Check if the interrupt must be processed by this handler */
   if ((j = (unsigned int)((char *)shap - sha)) >= num_boards) return IRQ_NONE;

   spin_lock_irqsave(sh[j]->host_lock, spin_flags);
   ret = ihdlr(j);
   spin_unlock_irqrestore(sh[j]->host_lock, spin_flags);
   return ret;
}

static int u14_34f_release(struct Scsi_Host *shpnt) {
   unsigned int i, j;

   for (j = 0; sh[j] != NULL && sh[j] != shpnt; j++);

   if (sh[j] == NULL)
      panic("%s: release, invalid Scsi_Host pointer.\n", driver_name);

   for (i = 0; i < sh[j]->can_queue; i++)
      kfree((&HD(j)->cp[i])->sglist);

   for (i = 0; i < sh[j]->can_queue; i++)
      pci_unmap_single(HD(j)->pdev, HD(j)->cp[i].cp_dma_addr,
                     sizeof(struct mscp), PCI_DMA_BIDIRECTIONAL);

   free_irq(sh[j]->irq, &sha[j]);

   if (sh[j]->dma_channel != NO_DMA)
      free_dma(sh[j]->dma_channel);

   release_region(sh[j]->io_port, sh[j]->n_io_port);
   scsi_unregister(sh[j]);
   return FALSE;
}

#include "scsi_module.c"

#ifndef MODULE
__setup("u14-34f=", option_setup);
#endif /* end MODULE */