Eric Lee / smarc-fsl-linux-kernel

epca.c 103 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 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 
/*

 
	Copyright (C) 1996  Digi International.
 
	For technical support please email digiLinux@dgii.com or
	call Digi tech support at (612) 912-3456

	Much of this design and code came from epca.c which was 
	copyright (C) 1994, 1995 Troy De Jongh, and subsquently 
	modified by David Nugent, Christoph Lameter, Mike McLagan. 
 
 	This program is free software; you can redistribute it and/or modify
 	it under the terms of the GNU General Public License as published by
 	the Free Software Foundation; either version 2 of the License, or
 	(at your option) any later version.

 	This program is distributed in the hope that it will be useful,
 	but WITHOUT ANY WARRANTY; without even the implied warranty of
 	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 	GNU General Public License for more details.

 	You should have received a copy of the GNU General Public License
 	along with this program; if not, write to the Free Software
 	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

--------------------------------------------------------------------------- */
/* See README.epca for change history --DAT*/


#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/serial.h>
#include <linux/delay.h>
#include <linux/ctype.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <asm/uaccess.h>
#include <asm/io.h>

#ifdef CONFIG_PCI
#define ENABLE_PCI
#endif /* CONFIG_PCI */

#define putUser(arg1, arg2) put_user(arg1, (unsigned long __user *)arg2)
#define getUser(arg1, arg2) get_user(arg1, (unsigned __user *)arg2)

#ifdef ENABLE_PCI
#include <linux/pci.h>
#include "digiPCI.h"
#endif /* ENABLE_PCI */

#include "digi1.h"
#include "digiFep1.h"
#include "epca.h"
#include "epcaconfig.h"

#if BITS_PER_LONG != 32
#  error FIXME: this driver only works on 32-bit platforms
#endif

/* ---------------------- Begin defines ------------------------ */

#define VERSION            "1.3.0.1-LK"

/* This major needs to be submitted to Linux to join the majors list */

#define DIGIINFOMAJOR       35  /* For Digi specific ioctl */ 


#define MAXCARDS 7
#define epcaassert(x, msg)  if (!(x)) epca_error(__LINE__, msg)

#define PFX "epca: "

/* ----------------- Begin global definitions ------------------- */

static char mesg[100];
static int nbdevs, num_cards, liloconfig;
static int digi_poller_inhibited = 1 ;

static int setup_error_code;
static int invalid_lilo_config;

/* -----------------------------------------------------------------------
	MAXBOARDS is typically 12, but ISA and EISA cards are restricted to 
	7 below.
--------------------------------------------------------------------------*/
static struct board_info boards[MAXBOARDS];


/* ------------- Begin structures used for driver registeration ---------- */

static struct tty_driver *pc_driver;
static struct tty_driver *pc_info;

/* ------------------ Begin Digi specific structures -------------------- */

/* ------------------------------------------------------------------------
	digi_channels represents an array of structures that keep track of
	each channel of the Digi product.  Information such as transmit and
	receive pointers, termio data, and signal definitions (DTR, CTS, etc ...)
	are stored here.  This structure is NOT used to overlay the cards 
	physical channel structure.
-------------------------------------------------------------------------- */
  
static struct channel digi_channels[MAX_ALLOC];

/* ------------------------------------------------------------------------
	card_ptr is an array used to hold the address of the
	first channel structure of each card.  This array will hold
	the addresses of various channels located in digi_channels.
-------------------------------------------------------------------------- */
static struct channel *card_ptr[MAXCARDS];

static struct timer_list epca_timer;

/* ---------------------- Begin function prototypes --------------------- */

/* ----------------------------------------------------------------------
	Begin generic memory functions.  These functions will be alias
	(point at) more specific functions dependent on the board being
	configured.
----------------------------------------------------------------------- */
	
static inline void memwinon(struct board_info *b, unsigned int win);
static inline void memwinoff(struct board_info *b, unsigned int win);
static inline void globalwinon(struct channel *ch);
static inline void rxwinon(struct channel *ch);
static inline void txwinon(struct channel *ch);
static inline void memoff(struct channel *ch);
static inline void assertgwinon(struct channel *ch);
static inline void assertmemoff(struct channel *ch);

/* ---- Begin more 'specific' memory functions for cx_like products --- */

static inline void pcxem_memwinon(struct board_info *b, unsigned int win);
static inline void pcxem_memwinoff(struct board_info *b, unsigned int win);
static inline void pcxem_globalwinon(struct channel *ch);
static inline void pcxem_rxwinon(struct channel *ch);
static inline void pcxem_txwinon(struct channel *ch);
static inline void pcxem_memoff(struct channel *ch);

/* ------ Begin more 'specific' memory functions for the pcxe ------- */

static inline void pcxe_memwinon(struct board_info *b, unsigned int win);
static inline void pcxe_memwinoff(struct board_info *b, unsigned int win);
static inline void pcxe_globalwinon(struct channel *ch);
static inline void pcxe_rxwinon(struct channel *ch);
static inline void pcxe_txwinon(struct channel *ch);
static inline void pcxe_memoff(struct channel *ch);

/* ---- Begin more 'specific' memory functions for the pc64xe and pcxi ---- */
/* Note : pc64xe and pcxi share the same windowing routines */

static inline void pcxi_memwinon(struct board_info *b, unsigned int win);
static inline void pcxi_memwinoff(struct board_info *b, unsigned int win);
static inline void pcxi_globalwinon(struct channel *ch);
static inline void pcxi_rxwinon(struct channel *ch);
static inline void pcxi_txwinon(struct channel *ch);
static inline void pcxi_memoff(struct channel *ch);

/* - Begin 'specific' do nothing memory functions needed for some cards - */

static inline void dummy_memwinon(struct board_info *b, unsigned int win);
static inline void dummy_memwinoff(struct board_info *b, unsigned int win);
static inline void dummy_globalwinon(struct channel *ch);
static inline void dummy_rxwinon(struct channel *ch);
static inline void dummy_txwinon(struct channel *ch);
static inline void dummy_memoff(struct channel *ch);
static inline void dummy_assertgwinon(struct channel *ch);
static inline void dummy_assertmemoff(struct channel *ch);

/* ------------------- Begin declare functions ----------------------- */

static inline struct channel *verifyChannel(register struct tty_struct *);
static inline void pc_sched_event(struct channel *, int);
static void epca_error(int, char *);
static void pc_close(struct tty_struct *, struct file *);
static void shutdown(struct channel *);
static void pc_hangup(struct tty_struct *);
static void pc_put_char(struct tty_struct *, unsigned char);
static int pc_write_room(struct tty_struct *);
static int pc_chars_in_buffer(struct tty_struct *);
static void pc_flush_buffer(struct tty_struct *);
static void pc_flush_chars(struct tty_struct *);
static int block_til_ready(struct tty_struct *, struct file *,
                           struct channel *);
static int pc_open(struct tty_struct *, struct file *);
static void post_fep_init(unsigned int crd);
static void epcapoll(unsigned long);
static void doevent(int);
static void fepcmd(struct channel *, int, int, int, int, int);
static unsigned termios2digi_h(struct channel *ch, unsigned);
static unsigned termios2digi_i(struct channel *ch, unsigned);
static unsigned termios2digi_c(struct channel *ch, unsigned);
static void epcaparam(struct tty_struct *, struct channel *);
static void receive_data(struct channel *);
static int pc_ioctl(struct tty_struct *, struct file *,
                    unsigned int, unsigned long);
static int info_ioctl(struct tty_struct *, struct file *,
                    unsigned int, unsigned long);
static void pc_set_termios(struct tty_struct *, struct termios *);
static void do_softint(void *);
static void pc_stop(struct tty_struct *);
static void pc_start(struct tty_struct *);
static void pc_throttle(struct tty_struct * tty);
static void pc_unthrottle(struct tty_struct *tty);
static void digi_send_break(struct channel *ch, int msec);
static void setup_empty_event(struct tty_struct *tty, struct channel *ch);
void epca_setup(char *, int *);
void console_print(const char *);

static int get_termio(struct tty_struct *, struct termio __user *);
static int pc_write(struct tty_struct *, const unsigned char *, int);
int pc_init(void);

#ifdef ENABLE_PCI
static int init_PCI(void);
#endif /* ENABLE_PCI */


/* ------------------------------------------------------------------
	Table of functions for each board to handle memory.  Mantaining 
	parallelism is a *very* good idea here.  The idea is for the 
	runtime code to blindly call these functions, not knowing/caring    
	about the underlying hardware.  This stuff should contain no
	conditionals; if more functionality is needed a different entry
	should be established.  These calls are the interface calls and 
	are the only functions that should be accessed.  Anyone caught
	making direct calls deserves what they get.
-------------------------------------------------------------------- */

static inline void memwinon(struct board_info *b, unsigned int win)
{
	(b->memwinon)(b, win);
}

static inline void memwinoff(struct board_info *b, unsigned int win)
{
	(b->memwinoff)(b, win);
}

static inline void globalwinon(struct channel *ch)
{
	(ch->board->globalwinon)(ch);
}

static inline void rxwinon(struct channel *ch)
{
	(ch->board->rxwinon)(ch);
}

static inline void txwinon(struct channel *ch)
{
	(ch->board->txwinon)(ch);
}

static inline void memoff(struct channel *ch)
{
	(ch->board->memoff)(ch);
}
static inline void assertgwinon(struct channel *ch)
{
	(ch->board->assertgwinon)(ch);
}

static inline void assertmemoff(struct channel *ch)
{
	(ch->board->assertmemoff)(ch);
}

/* ---------------------------------------------------------
	PCXEM windowing is the same as that used in the PCXR 
	and CX series cards.
------------------------------------------------------------ */

static inline void pcxem_memwinon(struct board_info *b, unsigned int win)
{
        outb_p(FEPWIN|win, (int)b->port + 1);
}

static inline void pcxem_memwinoff(struct board_info *b, unsigned int win)
{
	outb_p(0, (int)b->port + 1);
}

static inline void pcxem_globalwinon(struct channel *ch)
{
	outb_p( FEPWIN, (int)ch->board->port + 1);
}

static inline void pcxem_rxwinon(struct channel *ch)
{
	outb_p(ch->rxwin, (int)ch->board->port + 1);
}

static inline void pcxem_txwinon(struct channel *ch)
{
	outb_p(ch->txwin, (int)ch->board->port + 1);
}

static inline void pcxem_memoff(struct channel *ch)
{
	outb_p(0, (int)ch->board->port + 1);
}

/* ----------------- Begin pcxe memory window stuff ------------------ */

static inline void pcxe_memwinon(struct board_info *b, unsigned int win)
{
               outb_p(FEPWIN | win, (int)b->port + 1);
}

static inline void pcxe_memwinoff(struct board_info *b, unsigned int win)
{
	outb_p(inb((int)b->port) & ~FEPMEM,
	           (int)b->port + 1);
	outb_p(0, (int)b->port + 1);
}

static inline void pcxe_globalwinon(struct channel *ch)
{
	outb_p( FEPWIN, (int)ch->board->port + 1);
}

static inline void pcxe_rxwinon(struct channel *ch)
{
		outb_p(ch->rxwin, (int)ch->board->port + 1);
}

static inline void pcxe_txwinon(struct channel *ch)
{
		outb_p(ch->txwin, (int)ch->board->port + 1);
}

static inline void pcxe_memoff(struct channel *ch)
{
	outb_p(0, (int)ch->board->port);
	outb_p(0, (int)ch->board->port + 1);
}

/* ------------- Begin pc64xe and pcxi memory window stuff -------------- */

static inline void pcxi_memwinon(struct board_info *b, unsigned int win)
{
               outb_p(inb((int)b->port) | FEPMEM, (int)b->port);
}

static inline void pcxi_memwinoff(struct board_info *b, unsigned int win)
{
	outb_p(inb((int)b->port) & ~FEPMEM, (int)b->port);
}

static inline void pcxi_globalwinon(struct channel *ch)
{
	outb_p(FEPMEM, (int)ch->board->port);
}

static inline void pcxi_rxwinon(struct channel *ch)
{
		outb_p(FEPMEM, (int)ch->board->port);
}

static inline void pcxi_txwinon(struct channel *ch)
{
		outb_p(FEPMEM, (int)ch->board->port);
}

static inline void pcxi_memoff(struct channel *ch)
{
	outb_p(0, (int)ch->board->port);
}

static inline void pcxi_assertgwinon(struct channel *ch)
{
	epcaassert(inb((int)ch->board->port) & FEPMEM, "Global memory off");
}

static inline void pcxi_assertmemoff(struct channel *ch)
{
	epcaassert(!(inb((int)ch->board->port) & FEPMEM), "Memory on");
}


/* ----------------------------------------------------------------------
	Not all of the cards need specific memory windowing routines.  Some
	cards (Such as PCI) needs no windowing routines at all.  We provide
	these do nothing routines so that the same code base can be used.
	The driver will ALWAYS call a windowing routine if it thinks it needs
	to; regardless of the card.  However, dependent on the card the routine
	may or may not do anything.
---------------------------------------------------------------------------*/

static inline void dummy_memwinon(struct board_info *b, unsigned int win)
{
}

static inline void dummy_memwinoff(struct board_info *b, unsigned int win)
{
}

static inline void dummy_globalwinon(struct channel *ch)
{
}

static inline void dummy_rxwinon(struct channel *ch)
{
}

static inline void dummy_txwinon(struct channel *ch)
{
}

static inline void dummy_memoff(struct channel *ch)
{
}

static inline void dummy_assertgwinon(struct channel *ch)
{
}

static inline void dummy_assertmemoff(struct channel *ch)
{
}

/* ----------------- Begin verifyChannel function ----------------------- */
static inline struct channel *verifyChannel(register struct tty_struct *tty)
{ /* Begin verifyChannel */

	/* --------------------------------------------------------------------
		This routine basically provides a sanity check.  It insures that
		the channel returned is within the proper range of addresses as
		well as properly initialized.  If some bogus info gets passed in
		through tty->driver_data this should catch it.
	--------------------------------------------------------------------- */

	if (tty) 
	{ /* Begin if tty */

		register struct channel *ch = (struct channel *)tty->driver_data;

		if ((ch >= &digi_channels[0]) && (ch < &digi_channels[nbdevs])) 
		{
			if (ch->magic == EPCA_MAGIC)
				return ch;
		}

	} /* End if tty */

	/* Else return a NULL for invalid */
	return NULL;

} /* End verifyChannel */

/* ------------------ Begin pc_sched_event ------------------------- */

static inline void pc_sched_event(struct channel *ch, int event)
{ /* Begin pc_sched_event */


	/* ----------------------------------------------------------------------
		We call this to schedule interrupt processing on some event.  The 
		kernel sees our request and calls the related routine in OUR driver.
	-------------------------------------------------------------------------*/

	ch->event |= 1 << event;
	schedule_work(&ch->tqueue);


} /* End pc_sched_event */

/* ------------------ Begin epca_error ------------------------- */

static void epca_error(int line, char *msg)
{ /* Begin epca_error */

	printk(KERN_ERR "epca_error (Digi): line = %d %s\n",line,msg);
	return;

} /* End epca_error */

/* ------------------ Begin pc_close ------------------------- */
static void pc_close(struct tty_struct * tty, struct file * filp)
{ /* Begin pc_close */

	struct channel *ch;
	unsigned long flags;

	/* ---------------------------------------------------------
		verifyChannel returns the channel from the tty struct
		if it is valid.  This serves as a sanity check.
	------------------------------------------------------------- */

	if ((ch = verifyChannel(tty)) != NULL) 
	{ /* Begin if ch != NULL */

		save_flags(flags);
		cli();

		if (tty_hung_up_p(filp)) 
		{
			restore_flags(flags);
			return;
		}

		/* Check to see if the channel is open more than once */
		if (ch->count-- > 1) 
		{ /* Begin channel is open more than once */

			/* -------------------------------------------------------------
				Return without doing anything.  Someone might still be using
				the channel.
			---------------------------------------------------------------- */

			restore_flags(flags);
			return;
		} /* End channel is open more than once */

		/* Port open only once go ahead with shutdown & reset */

		if (ch->count < 0) 
		{
			ch->count = 0;
		}

		/* ---------------------------------------------------------------
			Let the rest of the driver know the channel is being closed.
			This becomes important if an open is attempted before close 
			is finished.
		------------------------------------------------------------------ */

		ch->asyncflags |= ASYNC_CLOSING;
	
		tty->closing = 1;

		if (ch->asyncflags & ASYNC_INITIALIZED) 
		{
			/* Setup an event to indicate when the transmit buffer empties */
			setup_empty_event(tty, ch);		
			tty_wait_until_sent(tty, 3000); /* 30 seconds timeout */
		}
	
		if (tty->driver->flush_buffer)
			tty->driver->flush_buffer(tty);

		tty_ldisc_flush(tty);
		shutdown(ch);
		tty->closing = 0;
		ch->event = 0;
		ch->tty = NULL;

		if (ch->blocked_open) 
		{ /* Begin if blocked_open */

			if (ch->close_delay) 
			{
				msleep_interruptible(jiffies_to_msecs(ch->close_delay));
			}

			wake_up_interruptible(&ch->open_wait);

		} /* End if blocked_open */

		ch->asyncflags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_INITIALIZED | 
		                      ASYNC_CLOSING);
		wake_up_interruptible(&ch->close_wait);


		restore_flags(flags);

	} /* End if ch != NULL */

} /* End pc_close */ 

/* ------------------ Begin shutdown  ------------------------- */

static void shutdown(struct channel *ch)
{ /* Begin shutdown */

	unsigned long flags;
	struct tty_struct *tty;
	volatile struct board_chan *bc;

	if (!(ch->asyncflags & ASYNC_INITIALIZED)) 
		return;

	save_flags(flags);
	cli();
	globalwinon(ch);

	bc = ch->brdchan;

	/* ------------------------------------------------------------------
		In order for an event to be generated on the receipt of data the
		idata flag must be set. Since we are shutting down, this is not 
		necessary clear this flag.
	--------------------------------------------------------------------- */ 

	if (bc)
		bc->idata = 0;

	tty = ch->tty;

	/* ----------------------------------------------------------------
	   If we're a modem control device and HUPCL is on, drop RTS & DTR.
 	------------------------------------------------------------------ */

	if (tty->termios->c_cflag & HUPCL) 
	{
		ch->omodem &= ~(ch->m_rts | ch->m_dtr);
		fepcmd(ch, SETMODEM, 0, ch->m_dtr | ch->m_rts, 10, 1);
	}

	memoff(ch);

	/* ------------------------------------------------------------------
		The channel has officialy been closed.  The next time it is opened
		it will have to reinitialized.  Set a flag to indicate this.
	---------------------------------------------------------------------- */

	/* Prevent future Digi programmed interrupts from coming active */

	ch->asyncflags &= ~ASYNC_INITIALIZED;
	restore_flags(flags);

} /* End shutdown */

/* ------------------ Begin pc_hangup  ------------------------- */

static void pc_hangup(struct tty_struct *tty)
{ /* Begin pc_hangup */

	struct channel *ch;
	
	/* ---------------------------------------------------------
		verifyChannel returns the channel from the tty struct
		if it is valid.  This serves as a sanity check.
	------------------------------------------------------------- */

	if ((ch = verifyChannel(tty)) != NULL) 
	{ /* Begin if ch != NULL */

		unsigned long flags;

		save_flags(flags);
		cli();
		if (tty->driver->flush_buffer)
			tty->driver->flush_buffer(tty);
		tty_ldisc_flush(tty);
		shutdown(ch);

		ch->tty   = NULL;
		ch->event = 0;
		ch->count = 0;
		restore_flags(flags);
		ch->asyncflags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_INITIALIZED);
		wake_up_interruptible(&ch->open_wait);

	} /* End if ch != NULL */

} /* End pc_hangup */

/* ------------------ Begin pc_write  ------------------------- */

static int pc_write(struct tty_struct * tty,
                    const unsigned char *buf, int bytesAvailable)
{ /* Begin pc_write */

	register unsigned int head, tail;
	register int dataLen;
	register int size;
	register int amountCopied;


	struct channel *ch;
	unsigned long flags;
	int remain;
	volatile struct board_chan *bc;


	/* ----------------------------------------------------------------
		pc_write is primarily called directly by the kernel routine
		tty_write (Though it can also be called by put_char) found in
		tty_io.c.  pc_write is passed a line discipline buffer where 
		the data to be written out is stored.  The line discipline 
		implementation itself is done at the kernel level and is not 
		brought into the driver.  
	------------------------------------------------------------------- */

	/* ---------------------------------------------------------
		verifyChannel returns the channel from the tty struct
		if it is valid.  This serves as a sanity check.
	------------------------------------------------------------- */

	if ((ch = verifyChannel(tty)) == NULL)
		return 0;

	/* Make a pointer to the channel data structure found on the board. */

	bc   = ch->brdchan;
	size = ch->txbufsize;

	amountCopied = 0;
	save_flags(flags);
	cli();

	globalwinon(ch);

	head = bc->tin & (size - 1);
	tail = bc->tout;

	if (tail != bc->tout)
		tail = bc->tout;
	tail &= (size - 1);

	/*	If head >= tail, head has not wrapped around. */ 
	if (head >= tail) 
	{ /* Begin head has not wrapped */

		/* ---------------------------------------------------------------
			remain (much like dataLen above) represents the total amount of
			space available on the card for data.  Here dataLen represents
			the space existing between the head pointer and the end of 
			buffer.  This is important because a memcpy cannot be told to
			automatically wrap around when it hits the buffer end.
		------------------------------------------------------------------ */ 

		dataLen = size - head;
		remain = size - (head - tail) - 1;

	} /* End head has not wrapped */
	else 
	{ /* Begin head has wrapped around */

		remain = tail - head - 1;
		dataLen = remain;

	} /* End head has wrapped around */

	/* -------------------------------------------------------------------
			Check the space on the card.  If we have more data than 
			space; reduce the amount of data to fit the space.
	---------------------------------------------------------------------- */

	bytesAvailable = min(remain, bytesAvailable);

	txwinon(ch);
	while (bytesAvailable > 0) 
	{ /* Begin while there is data to copy onto card */

		/* -----------------------------------------------------------------
			If head is not wrapped, the below will make sure the first 
			data copy fills to the end of card buffer.
		------------------------------------------------------------------- */

		dataLen = min(bytesAvailable, dataLen);
		memcpy(ch->txptr + head, buf, dataLen);
		buf += dataLen;
		head += dataLen;
		amountCopied += dataLen;
		bytesAvailable -= dataLen;

		if (head >= size) 
		{
			head = 0;
			dataLen = tail;
		}

	} /* End while there is data to copy onto card */

	ch->statusflags |= TXBUSY;
	globalwinon(ch);
	bc->tin = head;

	if ((ch->statusflags & LOWWAIT) == 0) 
	{
		ch->statusflags |= LOWWAIT;
		bc->ilow = 1;
	}
	memoff(ch);
	restore_flags(flags);

	return(amountCopied);

} /* End pc_write */

/* ------------------ Begin pc_put_char  ------------------------- */

static void pc_put_char(struct tty_struct *tty, unsigned char c)
{ /* Begin pc_put_char */

   
	pc_write(tty, &c, 1);
	return;

} /* End pc_put_char */

/* ------------------ Begin pc_write_room  ------------------------- */

static int pc_write_room(struct tty_struct *tty)
{ /* Begin pc_write_room */

	int remain;
	struct channel *ch;
	unsigned long flags;
	unsigned int head, tail;
	volatile struct board_chan *bc;

	remain = 0;

	/* ---------------------------------------------------------
		verifyChannel returns the channel from the tty struct
		if it is valid.  This serves as a sanity check.
	------------------------------------------------------------- */

	if ((ch = verifyChannel(tty)) != NULL) 
	{
		save_flags(flags);
		cli();
		globalwinon(ch);

		bc   = ch->brdchan;
		head = bc->tin & (ch->txbufsize - 1);
		tail = bc->tout;

		if (tail != bc->tout)
			tail = bc->tout;
		/* Wrap tail if necessary */
		tail &= (ch->txbufsize - 1);

		if ((remain = tail - head - 1) < 0 )
			remain += ch->txbufsize;

		if (remain && (ch->statusflags & LOWWAIT) == 0) 
		{
			ch->statusflags |= LOWWAIT;
			bc->ilow = 1;
		}
		memoff(ch);
		restore_flags(flags);
	}

	/* Return how much room is left on card */
	return remain;

} /* End pc_write_room */

/* ------------------ Begin pc_chars_in_buffer  ---------------------- */

static int pc_chars_in_buffer(struct tty_struct *tty)
{ /* Begin pc_chars_in_buffer */

	int chars;
	unsigned int ctail, head, tail;
	int remain;
	unsigned long flags;
	struct channel *ch;
	volatile struct board_chan *bc;


	/* ---------------------------------------------------------
		verifyChannel returns the channel from the tty struct
		if it is valid.  This serves as a sanity check.
	------------------------------------------------------------- */

	if ((ch = verifyChannel(tty)) == NULL)
		return(0);

	save_flags(flags);
	cli();
	globalwinon(ch);

	bc = ch->brdchan;
	tail = bc->tout;
	head = bc->tin;
	ctail = ch->mailbox->cout;

	if (tail == head && ch->mailbox->cin == ctail && bc->tbusy == 0)
		chars = 0;
	else 
	{ /* Begin if some space on the card has been used */

		head = bc->tin & (ch->txbufsize - 1);
		tail &= (ch->txbufsize - 1);

		/*  --------------------------------------------------------------
			The logic here is basically opposite of the above pc_write_room
			here we are finding the amount of bytes in the buffer filled.
			Not the amount of bytes empty.
		------------------------------------------------------------------- */

		if ((remain = tail - head - 1) < 0 )
			remain += ch->txbufsize;

		chars = (int)(ch->txbufsize - remain);

		/* -------------------------------------------------------------  
			Make it possible to wakeup anything waiting for output
			in tty_ioctl.c, etc.

			If not already set.  Setup an event to indicate when the
			transmit buffer empties 
		----------------------------------------------------------------- */

		if (!(ch->statusflags & EMPTYWAIT))
			setup_empty_event(tty,ch);

	} /* End if some space on the card has been used */

	memoff(ch);
	restore_flags(flags);

	/* Return number of characters residing on card. */
	return(chars);

} /* End pc_chars_in_buffer */

/* ------------------ Begin pc_flush_buffer  ---------------------- */

static void pc_flush_buffer(struct tty_struct *tty)
{ /* Begin pc_flush_buffer */

	unsigned int tail;
	unsigned long flags;
	struct channel *ch;
	volatile struct board_chan *bc;


	/* ---------------------------------------------------------
		verifyChannel returns the channel from the tty struct
		if it is valid.  This serves as a sanity check.
	------------------------------------------------------------- */

	if ((ch = verifyChannel(tty)) == NULL)
		return;

	save_flags(flags);
	cli();

	globalwinon(ch);

	bc   = ch->brdchan;
	tail = bc->tout;

	/* Have FEP move tout pointer; effectively flushing transmit buffer */

	fepcmd(ch, STOUT, (unsigned) tail, 0, 0, 0);

	memoff(ch);
	restore_flags(flags);

	wake_up_interruptible(&tty->write_wait);
	tty_wakeup(tty);

} /* End pc_flush_buffer */

/* ------------------ Begin pc_flush_chars  ---------------------- */

static void pc_flush_chars(struct tty_struct *tty)
{ /* Begin pc_flush_chars */

	struct channel * ch;

	/* ---------------------------------------------------------
		verifyChannel returns the channel from the tty struct
		if it is valid.  This serves as a sanity check.
	------------------------------------------------------------- */

	if ((ch = verifyChannel(tty)) != NULL) 
	{
		unsigned long flags;

		save_flags(flags);
		cli();

		/* ----------------------------------------------------------------
			If not already set and the transmitter is busy setup an event
			to indicate when the transmit empties.
		------------------------------------------------------------------- */

		if ((ch->statusflags & TXBUSY) && !(ch->statusflags & EMPTYWAIT))
			setup_empty_event(tty,ch);

		restore_flags(flags);
	}

} /* End pc_flush_chars */

/* ------------------ Begin block_til_ready  ---------------------- */

static int block_til_ready(struct tty_struct *tty, 
                           struct file *filp, struct channel *ch)
{ /* Begin block_til_ready */

	DECLARE_WAITQUEUE(wait,current);
	int	retval, do_clocal = 0;
	unsigned long flags;


	if (tty_hung_up_p(filp))
	{
		if (ch->asyncflags & ASYNC_HUP_NOTIFY)
			retval = -EAGAIN;
		else
			retval = -ERESTARTSYS;	
		return(retval);
	}

	/* ----------------------------------------------------------------- 
		If the device is in the middle of being closed, then block
		until it's done, and then try again.
	-------------------------------------------------------------------- */
	if (ch->asyncflags & ASYNC_CLOSING) 
	{
		interruptible_sleep_on(&ch->close_wait);

		if (ch->asyncflags & ASYNC_HUP_NOTIFY)
			return -EAGAIN;
		else
			return -ERESTARTSYS;
	}

	if (filp->f_flags & O_NONBLOCK) 
	{
		/* ----------------------------------------------------------------- 
	  	 If non-blocking mode is set, then make the check up front
	  	 and then exit.
		-------------------------------------------------------------------- */

		ch->asyncflags |= ASYNC_NORMAL_ACTIVE;

		return 0;
	}


	if (tty->termios->c_cflag & CLOCAL)
		do_clocal = 1;
	
   /* Block waiting for the carrier detect and the line to become free */
	
	retval = 0;
	add_wait_queue(&ch->open_wait, &wait);
	save_flags(flags);
	cli();


	/* We dec count so that pc_close will know when to free things */
	if (!tty_hung_up_p(filp))
		ch->count--;

	restore_flags(flags);

	ch->blocked_open++;

	while(1) 
	{ /* Begin forever while  */

		set_current_state(TASK_INTERRUPTIBLE);

		if (tty_hung_up_p(filp) ||
		    !(ch->asyncflags & ASYNC_INITIALIZED)) 
		{
			if (ch->asyncflags & ASYNC_HUP_NOTIFY)
				retval = -EAGAIN;
			else
				retval = -ERESTARTSYS;	
			break;
		}

		if (!(ch->asyncflags & ASYNC_CLOSING) && 
			  (do_clocal || (ch->imodem & ch->dcd)))
			break;

		if (signal_pending(current)) 
		{
			retval = -ERESTARTSYS;
			break;
		}

		/* ---------------------------------------------------------------
			Allow someone else to be scheduled.  We will occasionally go
			through this loop until one of the above conditions change.
			The below schedule call will allow other processes to enter and
			prevent this loop from hogging the cpu.
		------------------------------------------------------------------ */
		schedule();

	} /* End forever while  */

	current->state = TASK_RUNNING;
	remove_wait_queue(&ch->open_wait, &wait);
	cli();
	if (!tty_hung_up_p(filp))
		ch->count++;
	restore_flags(flags);

	ch->blocked_open--;

	if (retval)
		return retval;

	ch->asyncflags |= ASYNC_NORMAL_ACTIVE;

	return 0;

} /* End block_til_ready */	

/* ------------------ Begin pc_open  ---------------------- */

static int pc_open(struct tty_struct *tty, struct file * filp)
{ /* Begin pc_open */

	struct channel *ch;
	unsigned long flags;
	int line, retval, boardnum;
	volatile struct board_chan *bc;
	volatile unsigned int head;

	line = tty->index;
	if (line < 0 || line >= nbdevs) 
	{
		printk(KERN_ERR "<Error> - pc_open : line out of range in pc_open\n");
		tty->driver_data = NULL;
		return(-ENODEV);
	}


	ch = &digi_channels[line];
	boardnum = ch->boardnum;

	/* Check status of board configured in system.  */

	/* -----------------------------------------------------------------
		I check to see if the epca_setup routine detected an user error.  
		It might be better to put this in pc_init, but for the moment it
		goes here.
	---------------------------------------------------------------------- */

	if (invalid_lilo_config)
	{
		if (setup_error_code & INVALID_BOARD_TYPE)
			printk(KERN_ERR "<Error> - pc_open: Invalid board type specified in LILO command\n");

		if (setup_error_code & INVALID_NUM_PORTS)
			printk(KERN_ERR "<Error> - pc_open: Invalid number of ports specified in LILO command\n");

		if (setup_error_code & INVALID_MEM_BASE)
			printk(KERN_ERR "<Error> - pc_open: Invalid board memory address specified in LILO command\n");

		if (setup_error_code & INVALID_PORT_BASE)
			printk(KERN_ERR "<Error> - pc_open: Invalid board port address specified in LILO command\n");

		if (setup_error_code & INVALID_BOARD_STATUS)
			printk(KERN_ERR "<Error> - pc_open: Invalid board status specified in LILO command\n");

		if (setup_error_code & INVALID_ALTPIN)
			printk(KERN_ERR "<Error> - pc_open: Invalid board altpin specified in LILO command\n");

		tty->driver_data = NULL;   /* Mark this device as 'down' */
		return(-ENODEV);
	}

	if ((boardnum >= num_cards) || (boards[boardnum].status == DISABLED)) 
	{
		tty->driver_data = NULL;   /* Mark this device as 'down' */
		return(-ENODEV);
	}
	
	if (( bc = ch->brdchan) == 0) 
	{
		tty->driver_data = NULL;
		return(-ENODEV);
	}

	/* ------------------------------------------------------------------
		Every time a channel is opened, increment a counter.  This is 
		necessary because we do not wish to flush and shutdown the channel
		until the last app holding the channel open, closes it.	 	
	--------------------------------------------------------------------- */

	ch->count++;

	/* ----------------------------------------------------------------
		Set a kernel structures pointer to our local channel 
		structure.  This way we can get to it when passed only
		a tty struct.
	------------------------------------------------------------------ */

	tty->driver_data = ch;
	
	/* ----------------------------------------------------------------
		If this is the first time the channel has been opened, initialize
		the tty->termios struct otherwise let pc_close handle it.
	-------------------------------------------------------------------- */

	save_flags(flags);
	cli();

	globalwinon(ch);
	ch->statusflags = 0;

	/* Save boards current modem status */
	ch->imodem = bc->mstat;

	/* ----------------------------------------------------------------
	   Set receive head and tail ptrs to each other.  This indicates
	   no data available to read.
	----------------------------------------------------------------- */
	head = bc->rin;
	bc->rout = head;

	/* Set the channels associated tty structure */
	ch->tty = tty;

	/* -----------------------------------------------------------------
		The below routine generally sets up parity, baud, flow control 
		issues, etc.... It effect both control flags and input flags.
	-------------------------------------------------------------------- */
	epcaparam(tty,ch);

	ch->asyncflags |= ASYNC_INITIALIZED;
	memoff(ch);

	restore_flags(flags);

	retval = block_til_ready(tty, filp, ch);
	if (retval)
	{
		return retval;
	}

	/* -------------------------------------------------------------
		Set this again in case a hangup set it to zero while this 
		open() was waiting for the line...
	--------------------------------------------------------------- */
	ch->tty = tty;

	save_flags(flags);
	cli();
	globalwinon(ch);

	/* Enable Digi Data events */
	bc->idata = 1;

	memoff(ch);
	restore_flags(flags);

	return 0;

} /* End pc_open */

#ifdef MODULE
static int __init epca_module_init(void)
{ /* Begin init_module */

	unsigned long	flags;

	save_flags(flags);
	cli();

	pc_init();

	restore_flags(flags);

	return(0);
}

module_init(epca_module_init);
#endif

#ifdef ENABLE_PCI
static struct pci_driver epca_driver;
#endif

#ifdef MODULE
/* -------------------- Begin cleanup_module  ---------------------- */

static void __exit epca_module_exit(void)
{

	int               count, crd;
	struct board_info *bd;
	struct channel    *ch;
	unsigned long     flags;

	del_timer_sync(&epca_timer);

	save_flags(flags);
	cli();

	if ((tty_unregister_driver(pc_driver)) ||  
	    (tty_unregister_driver(pc_info)))
	{
		printk(KERN_WARNING "<Error> - DIGI : cleanup_module failed to un-register tty driver\n");
		restore_flags(flags);
		return;
	}
	put_tty_driver(pc_driver);
	put_tty_driver(pc_info);

	for (crd = 0; crd < num_cards; crd++) 
	{ /* Begin for each card */

		bd = &boards[crd];

		if (!bd)
		{ /* Begin sanity check */
			printk(KERN_ERR "<Error> - Digi : cleanup_module failed\n");
			return;
		} /* End sanity check */

		ch = card_ptr[crd]; 

		for (count = 0; count < bd->numports; count++, ch++) 
		{ /* Begin for each port */

			if (ch) 
			{
				if (ch->tty)
					tty_hangup(ch->tty);
				kfree(ch->tmp_buf);
			}

		} /* End for each port */
	} /* End for each card */

#ifdef ENABLE_PCI
	pci_unregister_driver (&epca_driver);
#endif

	restore_flags(flags);

}
module_exit(epca_module_exit);
#endif /* MODULE */

static struct tty_operations pc_ops = {
	.open = pc_open,
	.close = pc_close,
	.write = pc_write,
	.write_room = pc_write_room,
	.flush_buffer = pc_flush_buffer,
	.chars_in_buffer = pc_chars_in_buffer,
	.flush_chars = pc_flush_chars,
	.put_char = pc_put_char,
	.ioctl = pc_ioctl,
	.set_termios = pc_set_termios,
	.stop = pc_stop,
	.start = pc_start,
	.throttle = pc_throttle,
	.unthrottle = pc_unthrottle,
	.hangup = pc_hangup,
};

static int info_open(struct tty_struct *tty, struct file * filp)
{
	return 0;
}

static struct tty_operations info_ops = {
	.open = info_open,
	.ioctl = info_ioctl,
};

/* ------------------ Begin pc_init  ---------------------- */

int __init pc_init(void)
{ /* Begin pc_init */

	/* ----------------------------------------------------------------
		pc_init is called by the operating system during boot up prior to
		any open calls being made.  In the older versions of Linux (Prior
		to 2.0.0) an entry is made into tty_io.c.  A pointer to the last
		memory location (from kernel space) used (kmem_start) is passed
		to pc_init.  It is pc_inits responsibility to modify this value 
		for any memory that the Digi driver might need and then return
		this value to the operating system.  For example if the driver
		wishes to allocate 1K of kernel memory, pc_init would return 
		(kmem_start + 1024).  This memory (Between kmem_start and kmem_start
		+ 1024) would then be available for use exclusively by the driver.  
		In this case our driver does not allocate any of this kernel 
		memory.
	------------------------------------------------------------------*/

	ulong flags;
	int crd;
	struct board_info *bd;
	unsigned char board_id = 0;

#ifdef ENABLE_PCI
	int pci_boards_found, pci_count;

	pci_count = 0;
#endif /* ENABLE_PCI */

	pc_driver = alloc_tty_driver(MAX_ALLOC);
	if (!pc_driver)
		return -ENOMEM;

	pc_info = alloc_tty_driver(MAX_ALLOC);
	if (!pc_info) {
		put_tty_driver(pc_driver);
		return -ENOMEM;
	}

	/* -----------------------------------------------------------------------
		If epca_setup has not been ran by LILO set num_cards to defaults; copy
		board structure defined by digiConfig into drivers board structure.
		Note : If LILO has ran epca_setup then epca_setup will handle defining
		num_cards as well as copying the data into the board structure.
	-------------------------------------------------------------------------- */
	if (!liloconfig)
	{ /* Begin driver has been configured via. epcaconfig */

		nbdevs = NBDEVS;
		num_cards = NUMCARDS;
		memcpy((void *)&boards, (void *)&static_boards,
		       (sizeof(struct board_info) * NUMCARDS));
	} /* End driver has been configured via. epcaconfig */

	/* -----------------------------------------------------------------
		Note : If lilo was used to configure the driver and the 
		ignore epcaconfig option was choosen (digiepca=2) then 
		nbdevs and num_cards will equal 0 at this point.  This is
		okay; PCI cards will still be picked up if detected.
	--------------------------------------------------------------------- */

	/*  -----------------------------------------------------------
		Set up interrupt, we will worry about memory allocation in
		post_fep_init. 
	--------------------------------------------------------------- */


	printk(KERN_INFO "DIGI epca driver version %s loaded.\n",VERSION);

#ifdef ENABLE_PCI

	/* ------------------------------------------------------------------
		NOTE : This code assumes that the number of ports found in 
		       the boards array is correct.  This could be wrong if
		       the card in question is PCI (And therefore has no ports 
		       entry in the boards structure.)  The rest of the 
		       information will be valid for PCI because the beginning
		       of pc_init scans for PCI and determines i/o and base
		       memory addresses.  I am not sure if it is possible to 
		       read the number of ports supported by the card prior to
		       it being booted (Since that is the state it is in when 
		       pc_init is run).  Because it is not possible to query the
		       number of supported ports until after the card has booted;
		       we are required to calculate the card_ptrs as the card is	 
		       is initialized (Inside post_fep_init).  The negative thing
		       about this approach is that digiDload's call to GET_INFO
		       will have a bad port value.  (Since this is called prior
		       to post_fep_init.)

	--------------------------------------------------------------------- */
  
	pci_boards_found = 0;
	if(num_cards < MAXBOARDS)
		pci_boards_found += init_PCI();
	num_cards += pci_boards_found;

#endif /* ENABLE_PCI */

	pc_driver->owner = THIS_MODULE;
	pc_driver->name = "ttyD"; 
	pc_driver->devfs_name = "tts/D";
	pc_driver->major = DIGI_MAJOR; 
	pc_driver->minor_start = 0;
	pc_driver->type = TTY_DRIVER_TYPE_SERIAL;
	pc_driver->subtype = SERIAL_TYPE_NORMAL;
	pc_driver->init_termios = tty_std_termios;
	pc_driver->init_termios.c_iflag = 0;
	pc_driver->init_termios.c_oflag = 0;
	pc_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
	pc_driver->init_termios.c_lflag = 0;
	pc_driver->flags = TTY_DRIVER_REAL_RAW;
	tty_set_operations(pc_driver, &pc_ops);

	pc_info->owner = THIS_MODULE;
	pc_info->name = "digi_ctl";
	pc_info->major = DIGIINFOMAJOR;
	pc_info->minor_start = 0;
	pc_info->type = TTY_DRIVER_TYPE_SERIAL;
	pc_info->subtype = SERIAL_TYPE_INFO;
	pc_info->init_termios = tty_std_termios;
	pc_info->init_termios.c_iflag = 0;
	pc_info->init_termios.c_oflag = 0;
	pc_info->init_termios.c_lflag = 0;
	pc_info->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL;
	pc_info->flags = TTY_DRIVER_REAL_RAW;
	tty_set_operations(pc_info, &info_ops);


	save_flags(flags);
	cli();

	for (crd = 0; crd < num_cards; crd++) 
	{ /* Begin for each card */

		/*  ------------------------------------------------------------------
			This is where the appropriate memory handlers for the hardware is
			set.  Everything at runtime blindly jumps through these vectors.
		---------------------------------------------------------------------- */

		/* defined in epcaconfig.h */
		bd = &boards[crd];

		switch (bd->type)
		{ /* Begin switch on bd->type {board type} */
			case PCXEM:
			case EISAXEM:
				bd->memwinon     = pcxem_memwinon ;
				bd->memwinoff    = pcxem_memwinoff ;
				bd->globalwinon  = pcxem_globalwinon ;
				bd->txwinon      = pcxem_txwinon ;
				bd->rxwinon      = pcxem_rxwinon ;
				bd->memoff       = pcxem_memoff ;
				bd->assertgwinon = dummy_assertgwinon;
				bd->assertmemoff = dummy_assertmemoff;
				break;

			case PCIXEM:
			case PCIXRJ:
			case PCIXR:
				bd->memwinon     = dummy_memwinon;
				bd->memwinoff    = dummy_memwinoff;
				bd->globalwinon  = dummy_globalwinon;
				bd->txwinon      = dummy_txwinon;
				bd->rxwinon      = dummy_rxwinon;
				bd->memoff       = dummy_memoff;
				bd->assertgwinon = dummy_assertgwinon;
				bd->assertmemoff = dummy_assertmemoff;
				break;

			case PCXE:
			case PCXEVE:

				bd->memwinon     = pcxe_memwinon;
				bd->memwinoff    = pcxe_memwinoff;
				bd->globalwinon  = pcxe_globalwinon;
				bd->txwinon      = pcxe_txwinon;
				bd->rxwinon      = pcxe_rxwinon;
				bd->memoff       = pcxe_memoff;
				bd->assertgwinon = dummy_assertgwinon;
				bd->assertmemoff = dummy_assertmemoff;
				break;

			case PCXI:
			case PC64XE:

				bd->memwinon     = pcxi_memwinon;
				bd->memwinoff    = pcxi_memwinoff;
				bd->globalwinon  = pcxi_globalwinon;
				bd->txwinon      = pcxi_txwinon;
				bd->rxwinon      = pcxi_rxwinon;
				bd->memoff       = pcxi_memoff;
				bd->assertgwinon = pcxi_assertgwinon;
				bd->assertmemoff = pcxi_assertmemoff;
				break;

			default:
				break;

		} /* End switch on bd->type */

		/* ---------------------------------------------------------------
			Some cards need a memory segment to be defined for use in 
			transmit and receive windowing operations.  These boards
			are listed in the below switch.  In the case of the XI the
			amount of memory on the board is variable so the memory_seg
			is also variable.  This code determines what they segment 
			should be.
		----------------------------------------------------------------- */

		switch (bd->type)
		{ /* Begin switch on bd->type {board type} */

			case PCXE:
			case PCXEVE:
			case PC64XE:
				bd->memory_seg = 0xf000;
			break;

			case PCXI:
				board_id = inb((int)bd->port);
				if ((board_id & 0x1) == 0x1) 
				{ /* Begin it's an XI card */ 

					/* Is it a 64K board */
					if ((board_id & 0x30) == 0) 
						bd->memory_seg = 0xf000;

					/* Is it a 128K board */
					if ((board_id & 0x30) == 0x10) 
						bd->memory_seg = 0xe000;

					/* Is is a 256K board */	
					if ((board_id & 0x30) == 0x20) 
						bd->memory_seg = 0xc000;

					/* Is it a 512K board */
					if ((board_id & 0x30) == 0x30) 
						bd->memory_seg = 0x8000;

				} /* End it is an XI card */
				else
				{
					printk(KERN_ERR "<Error> - Board at 0x%x doesn't appear to be an XI\n",(int)bd->port);
				}
			break;

		} /* End switch on bd->type */

	} /* End for each card */

	if (tty_register_driver(pc_driver))
		panic("Couldn't register Digi PC/ driver");

	if (tty_register_driver(pc_info))
		panic("Couldn't register Digi PC/ info ");

	/* -------------------------------------------------------------------
	   Start up the poller to check for events on all enabled boards
	---------------------------------------------------------------------- */

	init_timer(&epca_timer);
	epca_timer.function = epcapoll;
	mod_timer(&epca_timer, jiffies + HZ/25);

	restore_flags(flags);

	return 0;

} /* End pc_init */

/* ------------------ Begin post_fep_init  ---------------------- */

static void post_fep_init(unsigned int crd)
{ /* Begin post_fep_init */

	int i;
	unchar *memaddr;
	volatile struct global_data *gd;
	struct board_info *bd;
	volatile struct board_chan *bc;
	struct channel *ch; 
	int shrinkmem = 0, lowwater ; 
 
	/*  -------------------------------------------------------------
		This call is made by the user via. the ioctl call DIGI_INIT.
		It is responsible for setting up all the card specific stuff.
	---------------------------------------------------------------- */
	bd = &boards[crd];

	/* -----------------------------------------------------------------
		If this is a PCI board, get the port info.  Remember PCI cards
		do not have entries into the epcaconfig.h file, so we can't get 
		the number of ports from it.  Unfortunetly, this means that anyone
		doing a DIGI_GETINFO before the board has booted will get an invalid
		number of ports returned (It should return 0).  Calls to DIGI_GETINFO
		after DIGI_INIT has been called will return the proper values. 
	------------------------------------------------------------------- */

	if (bd->type >= PCIXEM) /* If the board in question is PCI */
	{ /* Begin get PCI number of ports */

		/* --------------------------------------------------------------------
			Below we use XEMPORTS as a memory offset regardless of which PCI
			card it is.  This is because all of the supported PCI cards have
			the same memory offset for the channel data.  This will have to be
			changed if we ever develop a PCI/XE card.  NOTE : The FEP manual
			states that the port offset is 0xC22 as opposed to 0xC02.  This is
			only true for PC/XE, and PC/XI cards; not for the XEM, or CX series.
			On the PCI cards the number of ports is determined by reading a 
			ID PROM located in the box attached to the card.  The card can then
			determine the index the id to determine the number of ports available.
			(FYI - The id should be located at 0x1ac (And may use up to 4 bytes
			if the box in question is a XEM or CX)).  
		------------------------------------------------------------------------ */ 

		bd->numports = (unsigned short)*(unsigned char *)bus_to_virt((unsigned long)
                                                       (bd->re_map_membase + XEMPORTS));

		
		epcaassert(bd->numports <= 64,"PCI returned a invalid number of ports");
		nbdevs += (bd->numports);

	} /* End get PCI number of ports */

	if (crd != 0)
		card_ptr[crd] = card_ptr[crd-1] + boards[crd-1].numports;
	else
		card_ptr[crd] = &digi_channels[crd]; /* <- For card 0 only */

	ch = card_ptr[crd];


	epcaassert(ch <= &digi_channels[nbdevs - 1], "ch out of range");

	memaddr = (unchar *)bd->re_map_membase;

	/* 
	   The below command is necessary because newer kernels (2.1.x and
	   up) do not have a 1:1 virtual to physical mapping.  The below
	   call adjust for that.
	*/

	memaddr = (unsigned char *)bus_to_virt((unsigned long)memaddr);

	/* -----------------------------------------------------------------
		The below assignment will set bc to point at the BEGINING of
		the cards channel structures.  For 1 card there will be between
		8 and 64 of these structures.
	-------------------------------------------------------------------- */

	bc = (volatile struct board_chan *)((ulong)memaddr + CHANSTRUCT);

	/* -------------------------------------------------------------------
		The below assignment will set gd to point at the BEGINING of
		global memory address 0xc00.  The first data in that global
		memory actually starts at address 0xc1a.  The command in 
		pointer begins at 0xd10.
	---------------------------------------------------------------------- */

	gd = (volatile struct global_data *)((ulong)memaddr + GLOBAL);

	/* --------------------------------------------------------------------
		XEPORTS (address 0xc22) points at the number of channels the
		card supports. (For 64XE, XI, XEM, and XR use 0xc02)
	----------------------------------------------------------------------- */

	if (((bd->type == PCXEVE) | (bd->type == PCXE)) &&
	    (*(ushort *)((ulong)memaddr + XEPORTS) < 3))
		shrinkmem = 1;
	if (bd->type < PCIXEM)
		if (!request_region((int)bd->port, 4, board_desc[bd->type]))
			return;		

	memwinon(bd, 0);

	/*  --------------------------------------------------------------------
		Remember ch is the main drivers channels structure, while bc is 
	   the cards channel structure.
	------------------------------------------------------------------------ */

	/* For every port on the card do ..... */

	for (i = 0; i < bd->numports; i++, ch++, bc++) 
	{ /* Begin for each port */

		ch->brdchan        = bc;
		ch->mailbox        = gd; 
		INIT_WORK(&ch->tqueue, do_softint, ch);
		ch->board          = &boards[crd];

		switch (bd->type)
		{ /* Begin switch bd->type */

			/* ----------------------------------------------------------------
				Since some of the boards use different bitmaps for their
				control signals we cannot hard code these values and retain
				portability.  We virtualize this data here.
			------------------------------------------------------------------- */
			case EISAXEM:
			case PCXEM:
			case PCIXEM:
			case PCIXRJ:
			case PCIXR:
				ch->m_rts = 0x02 ;
				ch->m_dcd = 0x80 ; 
				ch->m_dsr = 0x20 ;
				ch->m_cts = 0x10 ;
				ch->m_ri  = 0x40 ;
				ch->m_dtr = 0x01 ;
				break;

			case PCXE:
			case PCXEVE:
			case PCXI:
			case PC64XE:
				ch->m_rts = 0x02 ;
				ch->m_dcd = 0x08 ; 
				ch->m_dsr = 0x10 ;
				ch->m_cts = 0x20 ;
				ch->m_ri  = 0x40 ;
				ch->m_dtr = 0x80 ;
				break;
	
		} /* End switch bd->type */

		if (boards[crd].altpin) 
		{
			ch->dsr = ch->m_dcd;
			ch->dcd = ch->m_dsr;
			ch->digiext.digi_flags |= DIGI_ALTPIN;
		}
		else 
		{ 
			ch->dcd = ch->m_dcd;
			ch->dsr = ch->m_dsr;
		}
	
		ch->boardnum   = crd;
		ch->channelnum = i;
		ch->magic      = EPCA_MAGIC;
		ch->tty        = NULL;

		if (shrinkmem) 
		{
			fepcmd(ch, SETBUFFER, 32, 0, 0, 0);
			shrinkmem = 0;
		}

		switch (bd->type)
		{ /* Begin switch bd->type */

			case PCIXEM:
			case PCIXRJ:
			case PCIXR:
				/* Cover all the 2MEG cards */
				ch->txptr = memaddr + (((bc->tseg) << 4) & 0x1fffff);
				ch->rxptr = memaddr + (((bc->rseg) << 4) & 0x1fffff);
				ch->txwin = FEPWIN | ((bc->tseg) >> 11);
				ch->rxwin = FEPWIN | ((bc->rseg) >> 11);
				break;

			case PCXEM:
			case EISAXEM:
				/* Cover all the 32K windowed cards */
				/* Mask equal to window size - 1 */
				ch->txptr = memaddr + (((bc->tseg) << 4) & 0x7fff);
				ch->rxptr = memaddr + (((bc->rseg) << 4) & 0x7fff);
				ch->txwin = FEPWIN | ((bc->tseg) >> 11);
				ch->rxwin = FEPWIN | ((bc->rseg) >> 11);
				break;

			case PCXEVE:
			case PCXE:
				ch->txptr = memaddr + (((bc->tseg - bd->memory_seg) << 4) & 0x1fff);
				ch->txwin = FEPWIN | ((bc->tseg - bd->memory_seg) >> 9);
				ch->rxptr = memaddr + (((bc->rseg - bd->memory_seg) << 4) & 0x1fff);
				ch->rxwin = FEPWIN | ((bc->rseg - bd->memory_seg) >>9 );
				break;

			case PCXI:
			case PC64XE:
				ch->txptr = memaddr + ((bc->tseg - bd->memory_seg) << 4);
				ch->rxptr = memaddr + ((bc->rseg - bd->memory_seg) << 4);
				ch->txwin = ch->rxwin = 0;
				break;

		} /* End switch bd->type */

		ch->txbufhead = 0;
		ch->txbufsize = bc->tmax + 1;
	
		ch->rxbufhead = 0;
		ch->rxbufsize = bc->rmax + 1;
	
		lowwater = ch->txbufsize >= 2000 ? 1024 : (ch->txbufsize / 2);

		/* Set transmitter low water mark */
		fepcmd(ch, STXLWATER, lowwater, 0, 10, 0);

		/* Set receiver low water mark */

		fepcmd(ch, SRXLWATER, (ch->rxbufsize / 4), 0, 10, 0);

		/* Set receiver high water mark */

		fepcmd(ch, SRXHWATER, (3 * ch->rxbufsize / 4), 0, 10, 0);

		bc->edelay = 100;
		bc->idata = 1;
	
		ch->startc  = bc->startc;
		ch->stopc   = bc->stopc;
		ch->startca = bc->startca;
		ch->stopca  = bc->stopca;
	
		ch->fepcflag = 0;
		ch->fepiflag = 0;
		ch->fepoflag = 0;
		ch->fepstartc = 0;
		ch->fepstopc = 0;
		ch->fepstartca = 0;
		ch->fepstopca = 0;
	
		ch->close_delay = 50;
		ch->count = 0;
		ch->blocked_open = 0;
		init_waitqueue_head(&ch->open_wait);
		init_waitqueue_head(&ch->close_wait);
		ch->tmp_buf = kmalloc(ch->txbufsize,GFP_KERNEL);
		if (!(ch->tmp_buf))
		{
			printk(KERN_ERR "POST FEP INIT : kmalloc failed for port 0x%x\n",i);
			release_region((int)bd->port, 4);
			while(i-- > 0)
				kfree((ch--)->tmp_buf);
			return;
		}
		else 
			memset((void *)ch->tmp_buf,0,ch->txbufsize);
	} /* End for each port */

	printk(KERN_INFO 
	        "Digi PC/Xx Driver V%s:  %s I/O = 0x%lx Mem = 0x%lx Ports = %d\n", 
	        VERSION, board_desc[bd->type], (long)bd->port, (long)bd->membase, bd->numports);
	sprintf(mesg, 
	        "Digi PC/Xx Driver V%s:  %s I/O = 0x%lx Mem = 0x%lx Ports = %d\n", 
	        VERSION, board_desc[bd->type], (long)bd->port, (long)bd->membase, bd->numports);
	console_print(mesg);

	memwinoff(bd, 0);

} /* End post_fep_init */

/* --------------------- Begin epcapoll  ------------------------ */

static void epcapoll(unsigned long ignored)
{ /* Begin epcapoll */

	unsigned long flags;
	int crd;
	volatile unsigned int head, tail;
	struct channel *ch;
	struct board_info *bd;

	/* -------------------------------------------------------------------
		This routine is called upon every timer interrupt.  Even though
		the Digi series cards are capable of generating interrupts this 
		method of non-looping polling is more efficient.  This routine
		checks for card generated events (Such as receive data, are transmit
		buffer empty) and acts on those events.
	----------------------------------------------------------------------- */
	
	save_flags(flags);
	cli();

	for (crd = 0; crd < num_cards; crd++) 
	{ /* Begin for each card */

		bd = &boards[crd];
		ch = card_ptr[crd];

		if ((bd->status == DISABLED) || digi_poller_inhibited)
			continue; /* Begin loop next interation */

		/* -----------------------------------------------------------
			assertmemoff is not needed here; indeed it is an empty subroutine.
			It is being kept because future boards may need this as well as
			some legacy boards.
		---------------------------------------------------------------- */

		assertmemoff(ch);

		globalwinon(ch);

		/* ---------------------------------------------------------------
			In this case head and tail actually refer to the event queue not
			the transmit or receive queue.
		------------------------------------------------------------------- */

		head = ch->mailbox->ein;
		tail = ch->mailbox->eout;
		
		/* If head isn't equal to tail we have an event */

		if (head != tail)
			doevent(crd);

		memoff(ch);

	} /* End for each card */

	mod_timer(&epca_timer, jiffies + (HZ / 25));

	restore_flags(flags);
} /* End epcapoll */

/* --------------------- Begin doevent  ------------------------ */

static void doevent(int crd)
{ /* Begin doevent */

	volatile unchar *eventbuf;
	struct channel *ch, *chan0;
	static struct tty_struct *tty;
	volatile struct board_info *bd;
	volatile struct board_chan *bc;
	register volatile unsigned int tail, head;
	register int event, channel;
	register int mstat, lstat;

	/* -------------------------------------------------------------------
		This subroutine is called by epcapoll when an event is detected 
		in the event queue.  This routine responds to those events.
	--------------------------------------------------------------------- */

	bd = &boards[crd];

	chan0 = card_ptr[crd];
	epcaassert(chan0 <= &digi_channels[nbdevs - 1], "ch out of range");

	assertgwinon(chan0);

	while ((tail = chan0->mailbox->eout) != (head = chan0->mailbox->ein)) 
	{ /* Begin while something in event queue */

		assertgwinon(chan0);

		eventbuf = (volatile unchar *)bus_to_virt((ulong)(bd->re_map_membase + tail + ISTART));

		/* Get the channel the event occurred on */
		channel = eventbuf[0];

		/* Get the actual event code that occurred */
		event = eventbuf[1];

		/*  ----------------------------------------------------------------
			The two assignments below get the current modem status (mstat)
			and the previous modem status (lstat).  These are useful becuase
			an event could signal a change in modem signals itself.
		------------------------------------------------------------------- */

		mstat = eventbuf[2];
		lstat = eventbuf[3];

		ch = chan0 + channel;

		if ((unsigned)channel >= bd->numports || !ch) 
		{ 
			if (channel >= bd->numports)
				ch = chan0;
			bc = ch->brdchan;
			goto next;
		}

		if ((bc = ch->brdchan) == NULL)
			goto next;

		if (event & DATA_IND) 
		{ /* Begin DATA_IND */

			receive_data(ch);
			assertgwinon(ch);

		} /* End DATA_IND */
		/* else *//* Fix for DCD transition missed bug */
		if (event & MODEMCHG_IND) 
		{ /* Begin MODEMCHG_IND */

			/* A modem signal change has been indicated */

			ch->imodem = mstat;

			if (ch->asyncflags & ASYNC_CHECK_CD) 
			{
				if (mstat & ch->dcd)  /* We are now receiving dcd */
					wake_up_interruptible(&ch->open_wait);
				else
					pc_sched_event(ch, EPCA_EVENT_HANGUP); /* No dcd; hangup */
			}

		} /* End MODEMCHG_IND */

		tty = ch->tty;
		if (tty) 
		{ /* Begin if valid tty */

			if (event & BREAK_IND) 
			{ /* Begin if BREAK_IND */

				/* A break has been indicated */

				tty->flip.count++;
				*tty->flip.flag_buf_ptr++ = TTY_BREAK;

				*tty->flip.char_buf_ptr++ = 0;

				tty_schedule_flip(tty); 

			} /* End if BREAK_IND */
			else
			if (event & LOWTX_IND) 
			{ /* Begin LOWTX_IND */

				if (ch->statusflags & LOWWAIT) 
				{ /* Begin if LOWWAIT */

					ch->statusflags &= ~LOWWAIT;
					tty_wakeup(tty);
					wake_up_interruptible(&tty->write_wait);

				} /* End if LOWWAIT */

			} /* End LOWTX_IND */
			else
			if (event & EMPTYTX_IND) 
			{ /* Begin EMPTYTX_IND */

				/* This event is generated by setup_empty_event */

				ch->statusflags &= ~TXBUSY;
				if (ch->statusflags & EMPTYWAIT) 
				{ /* Begin if EMPTYWAIT */

					ch->statusflags &= ~EMPTYWAIT;
					tty_wakeup(tty);

					wake_up_interruptible(&tty->write_wait);

				} /* End if EMPTYWAIT */

			} /* End EMPTYTX_IND */

		} /* End if valid tty */


	next:
		globalwinon(ch);

		if (!bc)
			printk(KERN_ERR "<Error> - bc == NULL in doevent!\n");
		else 
			bc->idata = 1;

		chan0->mailbox->eout = (tail + 4) & (IMAX - ISTART - 4);
		globalwinon(chan0);

	} /* End while something in event queue */

} /* End doevent */

/* --------------------- Begin fepcmd  ------------------------ */

static void fepcmd(struct channel *ch, int cmd, int word_or_byte,
                   int byte2, int ncmds, int bytecmd)
{ /* Begin fepcmd */

	unchar *memaddr;
	unsigned int head, cmdTail, cmdStart, cmdMax;
	long count;
	int n;

	/* This is the routine in which commands may be passed to the card. */

	if (ch->board->status == DISABLED)
	{
		return;
	}

	assertgwinon(ch);

	/* Remember head (As well as max) is just an offset not a base addr */
	head = ch->mailbox->cin;

	/* cmdStart is a base address */
	cmdStart = ch->mailbox->cstart;

	/* ------------------------------------------------------------------
		We do the addition below because we do not want a max pointer 
		relative to cmdStart.  We want a max pointer that points at the 
		physical end of the command queue.
	-------------------------------------------------------------------- */

	cmdMax = (cmdStart + 4 + (ch->mailbox->cmax));

	memaddr = ch->board->re_map_membase;

	/* 
	   The below command is necessary because newer kernels (2.1.x and
	   up) do not have a 1:1 virtual to physical mapping.  The below
	   call adjust for that.
	*/

	memaddr = (unsigned char *)bus_to_virt((unsigned long)memaddr);

	if (head >= (cmdMax - cmdStart) || (head & 03)) 
	{
		printk(KERN_ERR "line %d: Out of range, cmd = %x, head = %x\n", __LINE__, 
              cmd, head);
		printk(KERN_ERR "line %d: Out of range, cmdMax = %x, cmdStart = %x\n", __LINE__, 
              cmdMax, cmdStart);
		return;
	}

	if (bytecmd) 
	{
		*(volatile unchar *)(memaddr + head + cmdStart + 0) = (unchar)cmd;

		*(volatile unchar *)(memaddr + head + cmdStart + 1) = (unchar)ch->channelnum;
		/* Below word_or_byte is bits to set */
		*(volatile unchar *)(memaddr + head + cmdStart + 2) = (unchar)word_or_byte;
		/* Below byte2 is bits to reset */
		*(volatile unchar *)(memaddr + head + cmdStart + 3) = (unchar)byte2;

	} 
	else 
	{
		*(volatile unchar *)(memaddr + head + cmdStart + 0) = (unchar)cmd;
		*(volatile unchar *)(memaddr + head + cmdStart + 1) = (unchar)ch->channelnum;
		*(volatile ushort*)(memaddr + head + cmdStart + 2) = (ushort)word_or_byte;
	}

	head = (head + 4) & (cmdMax - cmdStart - 4);
	ch->mailbox->cin = head;

	count = FEPTIMEOUT;

	for (;;) 
	{ /* Begin forever loop */

		count--;
		if (count == 0) 
		{
			printk(KERN_ERR "<Error> - Fep not responding in fepcmd()\n");
			return;
		}

		head = ch->mailbox->cin;
		cmdTail = ch->mailbox->cout;

		n = (head - cmdTail) & (cmdMax - cmdStart - 4);

		/* ----------------------------------------------------------
			Basically this will break when the FEP acknowledges the 
			command by incrementing cmdTail (Making it equal to head).
		------------------------------------------------------------- */

		if (n <= ncmds * (sizeof(short) * 4))
			break; /* Well nearly forever :-) */

	} /* End forever loop */

} /* End fepcmd */

/* ---------------------------------------------------------------------
	Digi products use fields in their channels structures that are very
	similar to the c_cflag and c_iflag fields typically found in UNIX
	termios structures.  The below three routines allow mappings 
	between these hardware "flags" and their respective Linux flags.
------------------------------------------------------------------------- */
 
/* --------------------- Begin termios2digi_h -------------------- */

static unsigned termios2digi_h(struct channel *ch, unsigned cflag)
{ /* Begin termios2digi_h */

	unsigned res = 0;

	if (cflag & CRTSCTS) 
	{
		ch->digiext.digi_flags |= (RTSPACE | CTSPACE);
		res |= ((ch->m_cts) | (ch->m_rts));
	}

	if (ch->digiext.digi_flags & RTSPACE)
		res |= ch->m_rts;

	if (ch->digiext.digi_flags & DTRPACE)
		res |= ch->m_dtr;

	if (ch->digiext.digi_flags & CTSPACE)
		res |= ch->m_cts;

	if (ch->digiext.digi_flags & DSRPACE)
		res |= ch->dsr;

	if (ch->digiext.digi_flags & DCDPACE)
		res |= ch->dcd;

	if (res & (ch->m_rts))
		ch->digiext.digi_flags |= RTSPACE;

	if (res & (ch->m_cts))
		ch->digiext.digi_flags |= CTSPACE;

	return res;

} /* End termios2digi_h */

/* --------------------- Begin termios2digi_i -------------------- */
static unsigned termios2digi_i(struct channel *ch, unsigned iflag)
{ /* Begin termios2digi_i */

	unsigned res = iflag & (IGNBRK | BRKINT | IGNPAR | PARMRK | 
	                        INPCK | ISTRIP|IXON|IXANY|IXOFF);
	
	if (ch->digiext.digi_flags & DIGI_AIXON)
		res |= IAIXON;
	return res;

} /* End termios2digi_i */

/* --------------------- Begin termios2digi_c -------------------- */

static unsigned termios2digi_c(struct channel *ch, unsigned cflag)
{ /* Begin termios2digi_c */

	unsigned res = 0;

#ifdef SPEED_HACK
	/* CL: HACK to force 115200 at 38400 and 57600 at 19200 Baud */
	if ((cflag & CBAUD)== B38400) cflag=cflag - B38400 + B115200;
	if ((cflag & CBAUD)== B19200) cflag=cflag - B19200 + B57600;
#endif /* SPEED_HACK */

	if (cflag & CBAUDEX)
	{ /* Begin detected CBAUDEX */

		ch->digiext.digi_flags |= DIGI_FAST;

		/* -------------------------------------------------------------
		   HUPCL bit is used by FEP to indicate fast baud
		   table is to be used.
		----------------------------------------------------------------- */

		res |= FEP_HUPCL;

	} /* End detected CBAUDEX */
	else ch->digiext.digi_flags &= ~DIGI_FAST; 

	/* -------------------------------------------------------------------
		CBAUD has bit position 0x1000 set these days to indicate Linux
		baud rate remap.  Digi hardware can't handle the bit assignment.
		(We use a different bit assignment for high speed.).  Clear this
		bit out.
	---------------------------------------------------------------------- */
	res |= cflag & ((CBAUD ^ CBAUDEX) | PARODD | PARENB | CSTOPB | CSIZE);

	/* -------------------------------------------------------------
		This gets a little confusing.  The Digi cards have their own
		representation of c_cflags controling baud rate.  For the most
		part this is identical to the Linux implementation.  However;
		Digi supports one rate (76800) that Linux doesn't.  This means 
		that the c_cflag entry that would normally mean 76800 for Digi
		actually means 115200 under Linux.  Without the below mapping,
		a stty 115200 would only drive the board at 76800.  Since 
		the rate 230400 is also found after 76800, the same problem afflicts	
		us when we choose a rate of 230400.  Without the below modificiation
		stty 230400 would actually give us 115200.

		There are two additional differences.  The Linux value for CLOCAL
		(0x800; 0004000) has no meaning to the Digi hardware.  Also in 
		later releases of Linux; the CBAUD define has CBAUDEX (0x1000;
		0010000) ored into it (CBAUD = 0x100f as opposed to 0xf). CBAUDEX
		should be checked for a screened out prior to termios2digi_c 
		returning.  Since CLOCAL isn't used by the board this can be
		ignored as long as the returned value is used only by Digi hardware. 
	----------------------------------------------------------------- */

	if (cflag & CBAUDEX)
	{
		/* -------------------------------------------------------------
			The below code is trying to guarantee that only baud rates
			115200 and 230400 are remapped.  We use exclusive or because
			the various baud rates share common bit positions and therefore
			can't be tested for easily.
		----------------------------------------------------------------- */

				
		if ((!((cflag & 0x7) ^ (B115200 & ~CBAUDEX))) || 
		    (!((cflag & 0x7) ^ (B230400 & ~CBAUDEX))))
		{
			res += 1;
		}
	}

	return res;

} /* End termios2digi_c */

/* --------------------- Begin epcaparam  ----------------------- */

static void epcaparam(struct tty_struct *tty, struct channel *ch)
{ /* Begin epcaparam */

	unsigned int cmdHead;
	struct termios *ts;
	volatile struct board_chan *bc;
	unsigned mval, hflow, cflag, iflag;

	bc = ch->brdchan;
	epcaassert(bc !=0, "bc out of range");

	assertgwinon(ch);

	ts = tty->termios;

	if ((ts->c_cflag & CBAUD) == 0) 
	{ /* Begin CBAUD detected */

		cmdHead = bc->rin;
		bc->rout = cmdHead;
		cmdHead = bc->tin;

		/* Changing baud in mid-stream transmission can be wonderful */
		/* ---------------------------------------------------------------
			Flush current transmit buffer by setting cmdTail pointer (tout)
			to cmdHead pointer (tin).  Hopefully the transmit buffer is empty.
		----------------------------------------------------------------- */

		fepcmd(ch, STOUT, (unsigned) cmdHead, 0, 0, 0);
		mval = 0;

	} /* End CBAUD detected */
	else 
	{ /* Begin CBAUD not detected */

		/* -------------------------------------------------------------------
			c_cflags have changed but that change had nothing to do with BAUD.
			Propagate the change to the card.
		---------------------------------------------------------------------- */ 

		cflag = termios2digi_c(ch, ts->c_cflag);

		if (cflag != ch->fepcflag) 
		{
			ch->fepcflag = cflag;
			/* Set baud rate, char size, stop bits, parity */
			fepcmd(ch, SETCTRLFLAGS, (unsigned) cflag, 0, 0, 0);
		}


		/* ----------------------------------------------------------------
			If the user has not forced CLOCAL and if the device is not a 
			CALLOUT device (Which is always CLOCAL) we set flags such that
			the driver will wait on carrier detect.
		------------------------------------------------------------------- */

		if (ts->c_cflag & CLOCAL)
		{ /* Begin it is a cud device or a ttyD device with CLOCAL on */
			ch->asyncflags &= ~ASYNC_CHECK_CD;
		} /* End it is a cud device or a ttyD device with CLOCAL on */
		else
		{ /* Begin it is a ttyD device */
			ch->asyncflags |= ASYNC_CHECK_CD;
		} /* End it is a ttyD device */

		mval = ch->m_dtr | ch->m_rts;

	} /* End CBAUD not detected */

	iflag = termios2digi_i(ch, ts->c_iflag);

	/* Check input mode flags */

	if (iflag != ch->fepiflag) 
	{
		ch->fepiflag = iflag;

		/* ---------------------------------------------------------------
			Command sets channels iflag structure on the board. Such things 
			as input soft flow control, handling of parity errors, and
			break handling are all set here.
		------------------------------------------------------------------- */

		/* break handling, parity handling, input stripping, flow control chars */
		fepcmd(ch, SETIFLAGS, (unsigned int) ch->fepiflag, 0, 0, 0);
	}

	/* ---------------------------------------------------------------
		Set the board mint value for this channel.  This will cause hardware
		events to be generated each time the DCD signal (Described in mint) 
		changes.	
	------------------------------------------------------------------- */
	bc->mint = ch->dcd;

	if ((ts->c_cflag & CLOCAL) || (ch->digiext.digi_flags & DIGI_FORCEDCD))
		if (ch->digiext.digi_flags & DIGI_FORCEDCD)
			bc->mint = 0;

	ch->imodem = bc->mstat;

	hflow = termios2digi_h(ch, ts->c_cflag);

	if (hflow != ch->hflow) 
	{
		ch->hflow = hflow;

		/* --------------------------------------------------------------
			Hard flow control has been selected but the board is not
			using it.  Activate hard flow control now.
		----------------------------------------------------------------- */

		fepcmd(ch, SETHFLOW, hflow, 0xff, 0, 1);
	}
	

	mval ^= ch->modemfake & (mval ^ ch->modem);

	if (ch->omodem ^ mval) 
	{
		ch->omodem = mval;

		/* --------------------------------------------------------------
			The below command sets the DTR and RTS mstat structure.  If
			hard flow control is NOT active these changes will drive the
			output of the actual DTR and RTS lines.  If hard flow control 
			is active, the changes will be saved in the mstat structure and
			only asserted when hard flow control is turned off. 
		----------------------------------------------------------------- */

		/* First reset DTR & RTS; then set them */
		fepcmd(ch, SETMODEM, 0, ((ch->m_dtr)|(ch->m_rts)), 0, 1);
		fepcmd(ch, SETMODEM, mval, 0, 0, 1);

	}

	if (ch->startc != ch->fepstartc || ch->stopc != ch->fepstopc) 
	{
		ch->fepstartc = ch->startc;
		ch->fepstopc = ch->stopc;

		/* ------------------------------------------------------------
			The XON / XOFF characters have changed; propagate these
			changes to the card.	
		--------------------------------------------------------------- */

		fepcmd(ch, SONOFFC, ch->fepstartc, ch->fepstopc, 0, 1);
	}

	if (ch->startca != ch->fepstartca || ch->stopca != ch->fepstopca) 
	{
		ch->fepstartca = ch->startca;
		ch->fepstopca = ch->stopca;

		/* ---------------------------------------------------------------
			Similar to the above, this time the auxilarly XON / XOFF 
			characters have changed; propagate these changes to the card.
		------------------------------------------------------------------ */

		fepcmd(ch, SAUXONOFFC, ch->fepstartca, ch->fepstopca, 0, 1);
	}

} /* End epcaparam */

/* --------------------- Begin receive_data  ----------------------- */

static void receive_data(struct channel *ch)
{ /* Begin receive_data */

	unchar *rptr;
	struct termios *ts = NULL;
	struct tty_struct *tty;
	volatile struct board_chan *bc;
	register int dataToRead, wrapgap, bytesAvailable;
	register unsigned int tail, head;
	unsigned int wrapmask;
	int rc;


	/* ---------------------------------------------------------------
		This routine is called by doint when a receive data event 
		has taken place.
	------------------------------------------------------------------- */

	globalwinon(ch);

	if (ch->statusflags & RXSTOPPED)
		return;

	tty = ch->tty;
	if (tty)
		ts = tty->termios;

	bc = ch->brdchan;

	if (!bc) 
	{
		printk(KERN_ERR "<Error> - bc is NULL in receive_data!\n");
		return;
	}

	wrapmask = ch->rxbufsize - 1;

	/* --------------------------------------------------------------------- 
		Get the head and tail pointers to the receiver queue.  Wrap the 
		head pointer if it has reached the end of the buffer.
	------------------------------------------------------------------------ */

	head = bc->rin;
	head &= wrapmask;
	tail = bc->rout & wrapmask;

	bytesAvailable = (head - tail) & wrapmask;

	if (bytesAvailable == 0)
		return;

	/* ------------------------------------------------------------------
	   If CREAD bit is off or device not open, set TX tail to head
	--------------------------------------------------------------------- */

	if (!tty || !ts || !(ts->c_cflag & CREAD)) 
	{
		bc->rout = head;
		return;
	}

	if (tty->flip.count == TTY_FLIPBUF_SIZE) 
		return;

	if (bc->orun) 
	{
		bc->orun = 0;
		printk(KERN_WARNING "overrun! DigiBoard device %s\n",tty->name);
	}

	rxwinon(ch);
	rptr = tty->flip.char_buf_ptr;
	rc = tty->flip.count;

	while (bytesAvailable > 0) 
	{ /* Begin while there is data on the card */

		wrapgap = (head >= tail) ? head - tail : ch->rxbufsize - tail;

		/* ---------------------------------------------------------------
			Even if head has wrapped around only report the amount of
			data to be equal to the size - tail.  Remember memcpy can't
			automaticly wrap around the receive buffer.
		----------------------------------------------------------------- */

		dataToRead = (wrapgap < bytesAvailable) ? wrapgap : bytesAvailable;

		/* --------------------------------------------------------------
		   Make sure we don't overflow the buffer
		----------------------------------------------------------------- */

		if ((rc + dataToRead) > TTY_FLIPBUF_SIZE)
			dataToRead = TTY_FLIPBUF_SIZE - rc;

		if (dataToRead == 0)
			break;

		/* ---------------------------------------------------------------
			Move data read from our card into the line disciplines buffer
			for translation if necessary.
		------------------------------------------------------------------ */

		if ((memcpy(rptr, ch->rxptr + tail, dataToRead)) != rptr)
			printk(KERN_ERR "<Error> - receive_data : memcpy failed\n");
			
		rc   += dataToRead;
		rptr += dataToRead;
		tail = (tail + dataToRead) & wrapmask;
		bytesAvailable -= dataToRead;

	} /* End while there is data on the card */


	tty->flip.count = rc;
	tty->flip.char_buf_ptr = rptr;
	globalwinon(ch);
	bc->rout = tail;

	/* Must be called with global data */
	tty_schedule_flip(ch->tty); 
	return;

} /* End receive_data */

static int info_ioctl(struct tty_struct *tty, struct file * file,
		    unsigned int cmd, unsigned long arg)
{
	switch (cmd) 
	{ /* Begin switch cmd */

		case DIGI_GETINFO:
		{ /* Begin case DIGI_GETINFO */

			struct digi_info di ;
			int brd;

			getUser(brd, (unsigned int __user *)arg);

			if ((brd < 0) || (brd >= num_cards) || (num_cards == 0))
				return (-ENODEV);

			memset(&di, 0, sizeof(di));

			di.board = brd ; 
			di.status = boards[brd].status;
			di.type = boards[brd].type ;
			di.numports = boards[brd].numports ;
			di.port = boards[brd].port ;
			di.membase = boards[brd].membase ;

			if (copy_to_user((void __user *)arg, &di, sizeof (di)))
				return -EFAULT;
			break;

		} /* End case DIGI_GETINFO */

		case DIGI_POLLER:
		{ /* Begin case DIGI_POLLER */

			int brd = arg & 0xff000000 >> 16 ; 
			unsigned char state = arg & 0xff ; 

			if ((brd < 0) || (brd >= num_cards))
			{
				printk(KERN_ERR "<Error> - DIGI POLLER : brd not valid!\n");
				return (-ENODEV);
			}

			digi_poller_inhibited = state ;
			break ; 

		} /* End case DIGI_POLLER */

		case DIGI_INIT:
		{ /* Begin case DIGI_INIT */

			/* ------------------------------------------------------------
				This call is made by the apps to complete the initilization
				of the board(s).  This routine is responsible for setting
				the card to its initial state and setting the drivers control
				fields to the sutianle settings for the card in question.
			---------------------------------------------------------------- */
		
			int crd ; 
			for (crd = 0; crd < num_cards; crd++) 
				post_fep_init (crd);

			break ; 

		} /* End case DIGI_INIT */


		default:
			return -ENOIOCTLCMD;

	} /* End switch cmd */
	return (0) ;
}
/* --------------------- Begin pc_ioctl  ----------------------- */

static int pc_tiocmget(struct tty_struct *tty, struct file *file)
{
	struct channel *ch = (struct channel *) tty->driver_data;
	volatile struct board_chan *bc;
	unsigned int mstat, mflag = 0;
	unsigned long flags;

	if (ch)
		bc = ch->brdchan;
	else
	{
		printk(KERN_ERR "<Error> - ch is NULL in pc_tiocmget!\n");
		return(-EINVAL);
	}

	save_flags(flags);
	cli();
	globalwinon(ch);
	mstat = bc->mstat;
	memoff(ch);
	restore_flags(flags);

	if (mstat & ch->m_dtr)
		mflag |= TIOCM_DTR;

	if (mstat & ch->m_rts)
		mflag |= TIOCM_RTS;

	if (mstat & ch->m_cts)
		mflag |= TIOCM_CTS;

	if (mstat & ch->dsr)
		mflag |= TIOCM_DSR;

	if (mstat & ch->m_ri)
		mflag |= TIOCM_RI;

	if (mstat & ch->dcd)
		mflag |= TIOCM_CD;

	return mflag;
}

static int pc_tiocmset(struct tty_struct *tty, struct file *file,
		       unsigned int set, unsigned int clear)
{
	struct channel *ch = (struct channel *) tty->driver_data;
	unsigned long flags;

	if (!ch) {
		printk(KERN_ERR "<Error> - ch is NULL in pc_tiocmset!\n");
		return(-EINVAL);
	}

	save_flags(flags);
	cli();
	/*
	 * I think this modemfake stuff is broken.  It doesn't
	 * correctly reflect the behaviour desired by the TIOCM*
	 * ioctls.  Therefore this is probably broken.
	 */
	if (set & TIOCM_RTS) {
		ch->modemfake |= ch->m_rts;
		ch->modem |= ch->m_rts;
	}
	if (set & TIOCM_DTR) {
		ch->modemfake |= ch->m_dtr;
		ch->modem |= ch->m_dtr;
	}
	if (clear & TIOCM_RTS) {
		ch->modemfake |= ch->m_rts;
		ch->modem &= ~ch->m_rts;
	}
	if (clear & TIOCM_DTR) {
		ch->modemfake |= ch->m_dtr;
		ch->modem &= ~ch->m_dtr;
	}

	globalwinon(ch);

	/*  --------------------------------------------------------------
		The below routine generally sets up parity, baud, flow control
		issues, etc.... It effect both control flags and input flags.
	------------------------------------------------------------------ */

	epcaparam(tty,ch);
	memoff(ch);
	restore_flags(flags);
	return 0;
}

static int pc_ioctl(struct tty_struct *tty, struct file * file,
		    unsigned int cmd, unsigned long arg)
{ /* Begin pc_ioctl */

	digiflow_t dflow;
	int retval;
	unsigned long flags;
	unsigned int mflag, mstat;
	unsigned char startc, stopc;
	volatile struct board_chan *bc;
	struct channel *ch = (struct channel *) tty->driver_data;
	void __user *argp = (void __user *)arg;
	
	if (ch)
		bc = ch->brdchan;
	else 
	{
		printk(KERN_ERR "<Error> - ch is NULL in pc_ioctl!\n");
		return(-EINVAL);
	}

	save_flags(flags);

	/* -------------------------------------------------------------------
		For POSIX compliance we need to add more ioctls.  See tty_ioctl.c
		in /usr/src/linux/drivers/char for a good example.  In particular 
		think about adding TCSETAF, TCSETAW, TCSETA, TCSETSF, TCSETSW, TCSETS.
	---------------------------------------------------------------------- */

	switch (cmd) 
	{ /* Begin switch cmd */

		case TCGETS:
			if (copy_to_user(argp, 
					 tty->termios, sizeof(struct termios)))
				return -EFAULT;
			return(0);

		case TCGETA:
			return get_termio(tty, argp);

		case TCSBRK:	/* SVID version: non-zero arg --> no break */

			retval = tty_check_change(tty);
			if (retval)
				return retval;

			/* Setup an event to indicate when the transmit buffer empties */

			setup_empty_event(tty,ch);		
			tty_wait_until_sent(tty, 0);
			if (!arg)
				digi_send_break(ch, HZ/4);    /* 1/4 second */
			return 0;

		case TCSBRKP:	/* support for POSIX tcsendbreak() */

			retval = tty_check_change(tty);
			if (retval)
				return retval;

			/* Setup an event to indicate when the transmit buffer empties */

			setup_empty_event(tty,ch);		
			tty_wait_until_sent(tty, 0);
			digi_send_break(ch, arg ? arg*(HZ/10) : HZ/4);
			return 0;

		case TIOCGSOFTCAR:
			if (put_user(C_CLOCAL(tty)?1:0, (unsigned long __user *)arg))
				return -EFAULT;
			return 0;

		case TIOCSSOFTCAR:
		{
			unsigned int value;

			if (get_user(value, (unsigned __user *)argp))
				return -EFAULT;
			tty->termios->c_cflag =
				((tty->termios->c_cflag & ~CLOCAL) |
				 (value ? CLOCAL : 0));
			return 0;
		}

		case TIOCMODG:
			mflag = pc_tiocmget(tty, file);
			if (put_user(mflag, (unsigned long __user *)argp))
				return -EFAULT;
			break;

		case TIOCMODS:
			if (get_user(mstat, (unsigned __user *)argp))
				return -EFAULT;
			return pc_tiocmset(tty, file, mstat, ~mstat);

		case TIOCSDTR:
			ch->omodem |= ch->m_dtr;
			cli();
			globalwinon(ch);
			fepcmd(ch, SETMODEM, ch->m_dtr, 0, 10, 1);
			memoff(ch);
			restore_flags(flags);
			break;

		case TIOCCDTR:
			ch->omodem &= ~ch->m_dtr;
			cli();
			globalwinon(ch);
			fepcmd(ch, SETMODEM, 0, ch->m_dtr, 10, 1);
			memoff(ch);
			restore_flags(flags);
			break;

		case DIGI_GETA:
			if (copy_to_user(argp, &ch->digiext, sizeof(digi_t)))
				return -EFAULT;
			break;

		case DIGI_SETAW:
		case DIGI_SETAF:
			if ((cmd) == (DIGI_SETAW)) 
			{
				/* Setup an event to indicate when the transmit buffer empties */

				setup_empty_event(tty,ch);		
				tty_wait_until_sent(tty, 0);
			}
			else 
			{
				/* ldisc lock already held in ioctl */
				if (tty->ldisc.flush_buffer)
					tty->ldisc.flush_buffer(tty);
			}

			/* Fall Thru */

		case DIGI_SETA:
			if (copy_from_user(&ch->digiext, argp, sizeof(digi_t)))
				return -EFAULT;
			
			if (ch->digiext.digi_flags & DIGI_ALTPIN) 
			{
				ch->dcd = ch->m_dsr;
				ch->dsr = ch->m_dcd;
			} 
			else 
			{
				ch->dcd = ch->m_dcd;
				ch->dsr = ch->m_dsr;
			}
		
			cli();
			globalwinon(ch);

			/* -----------------------------------------------------------------
				The below routine generally sets up parity, baud, flow control 
				issues, etc.... It effect both control flags and input flags.
			------------------------------------------------------------------- */

			epcaparam(tty,ch);
			memoff(ch);
			restore_flags(flags);
			break;

		case DIGI_GETFLOW:
		case DIGI_GETAFLOW:
			cli();	
			globalwinon(ch);
			if ((cmd) == (DIGI_GETFLOW)) 
			{
				dflow.startc = bc->startc;
				dflow.stopc = bc->stopc;
			}
			else 
			{
				dflow.startc = bc->startca;
				dflow.stopc = bc->stopca;
			}
			memoff(ch);
			restore_flags(flags);

			if (copy_to_user(argp, &dflow, sizeof(dflow)))
				return -EFAULT;
			break;

		case DIGI_SETAFLOW:
		case DIGI_SETFLOW:
			if ((cmd) == (DIGI_SETFLOW)) 
			{
				startc = ch->startc;
				stopc = ch->stopc;
			} 
			else 
			{
				startc = ch->startca;
				stopc = ch->stopca;
			}

			if (copy_from_user(&dflow, argp, sizeof(dflow)))
				return -EFAULT;

			if (dflow.startc != startc || dflow.stopc != stopc) 
			{ /* Begin  if setflow toggled */
				cli();
				globalwinon(ch);

				if ((cmd) == (DIGI_SETFLOW)) 
				{
					ch->fepstartc = ch->startc = dflow.startc;
					ch->fepstopc = ch->stopc = dflow.stopc;
					fepcmd(ch, SONOFFC, ch->fepstartc, ch->fepstopc, 0, 1);
				} 
				else 
				{
					ch->fepstartca = ch->startca = dflow.startc;
					ch->fepstopca  = ch->stopca = dflow.stopc;
					fepcmd(ch, SAUXONOFFC, ch->fepstartca, ch->fepstopca, 0, 1);
				}

				if	(ch->statusflags & TXSTOPPED)
					pc_start(tty);

				memoff(ch);
				restore_flags(flags);

			} /* End if setflow toggled */
			break;

		default:
			return -ENOIOCTLCMD;

	} /* End switch cmd */

	return 0;

} /* End pc_ioctl */

/* --------------------- Begin pc_set_termios  ----------------------- */

static void pc_set_termios(struct tty_struct *tty, struct termios *old_termios)
{ /* Begin pc_set_termios */

	struct channel *ch;
	unsigned long flags;

	/* ---------------------------------------------------------
		verifyChannel returns the channel from the tty struct
		if it is valid.  This serves as a sanity check.
	------------------------------------------------------------- */

	if ((ch = verifyChannel(tty)) != NULL) 
	{ /* Begin if channel valid */

		save_flags(flags);
		cli();
		globalwinon(ch);
		epcaparam(tty, ch);
		memoff(ch);

		if ((old_termios->c_cflag & CRTSCTS) &&
			 ((tty->termios->c_cflag & CRTSCTS) == 0))
			tty->hw_stopped = 0;

		if (!(old_termios->c_cflag & CLOCAL) &&
			 (tty->termios->c_cflag & CLOCAL))
			wake_up_interruptible(&ch->open_wait);

		restore_flags(flags);

	} /* End if channel valid */

} /* End pc_set_termios */

/* --------------------- Begin do_softint  ----------------------- */

static void do_softint(void *private_)
{ /* Begin do_softint */

	struct channel *ch = (struct channel *) private_;
	

	/* Called in response to a modem change event */

	if (ch && ch->magic == EPCA_MAGIC) 
	{ /* Begin EPCA_MAGIC */

		struct tty_struct *tty = ch->tty;

		if (tty && tty->driver_data) 
		{ 
			if (test_and_clear_bit(EPCA_EVENT_HANGUP, &ch->event)) 
			{ /* Begin if clear_bit */

				tty_hangup(tty);	/* FIXME: module removal race here - AKPM */
				wake_up_interruptible(&ch->open_wait);
				ch->asyncflags &= ~ASYNC_NORMAL_ACTIVE;

			} /* End if clear_bit */
		}

	} /* End EPCA_MAGIC */
} /* End do_softint */

/* ------------------------------------------------------------
	pc_stop and pc_start provide software flow control to the 
	routine and the pc_ioctl routine.
---------------------------------------------------------------- */

/* --------------------- Begin pc_stop  ----------------------- */

static void pc_stop(struct tty_struct *tty)
{ /* Begin pc_stop */

	struct channel *ch;
	unsigned long flags;

	/* ---------------------------------------------------------
		verifyChannel returns the channel from the tty struct
		if it is valid.  This serves as a sanity check.
	------------------------------------------------------------- */

	if ((ch = verifyChannel(tty)) != NULL) 
	{ /* Begin if valid channel */

		save_flags(flags); 
		cli();

		if ((ch->statusflags & TXSTOPPED) == 0) 
		{ /* Begin if transmit stop requested */

			globalwinon(ch);

			/* STOP transmitting now !! */

			fepcmd(ch, PAUSETX, 0, 0, 0, 0);

			ch->statusflags |= TXSTOPPED;
			memoff(ch);

		} /* End if transmit stop requested */

		restore_flags(flags);

	} /* End if valid channel */

} /* End pc_stop */

/* --------------------- Begin pc_start  ----------------------- */

static void pc_start(struct tty_struct *tty)
{ /* Begin pc_start */

	struct channel *ch;

	/* ---------------------------------------------------------
		verifyChannel returns the channel from the tty struct
		if it is valid.  This serves as a sanity check.
	------------------------------------------------------------- */

	if ((ch = verifyChannel(tty)) != NULL) 
	{ /* Begin if channel valid */

		unsigned long flags;

		save_flags(flags);
		cli();

		/* Just in case output was resumed because of a change in Digi-flow */
		if (ch->statusflags & TXSTOPPED) 
		{ /* Begin transmit resume requested */

			volatile struct board_chan *bc;

			globalwinon(ch);
			bc = ch->brdchan;
			if (ch->statusflags & LOWWAIT)
				bc->ilow = 1;

			/* Okay, you can start transmitting again... */

			fepcmd(ch, RESUMETX, 0, 0, 0, 0);

			ch->statusflags &= ~TXSTOPPED;
			memoff(ch);

		} /* End transmit resume requested */

		restore_flags(flags);

	} /* End if channel valid */

} /* End pc_start */

/* ------------------------------------------------------------------
	The below routines pc_throttle and pc_unthrottle are used 
	to slow (And resume) the receipt of data into the kernels
	receive buffers.  The exact occurrence of this depends on the
	size of the kernels receive buffer and what the 'watermarks'
	are set to for that buffer.  See the n_ttys.c file for more
	details. 
______________________________________________________________________ */
/* --------------------- Begin throttle  ----------------------- */

static void pc_throttle(struct tty_struct * tty)
{ /* Begin pc_throttle */

	struct channel *ch;
	unsigned long flags;

	/* ---------------------------------------------------------
		verifyChannel returns the channel from the tty struct
		if it is valid.  This serves as a sanity check.
	------------------------------------------------------------- */

	if ((ch = verifyChannel(tty)) != NULL) 
	{ /* Begin if channel valid */


		save_flags(flags);
		cli();

		if ((ch->statusflags & RXSTOPPED) == 0)
		{
			globalwinon(ch);
			fepcmd(ch, PAUSERX, 0, 0, 0, 0);

			ch->statusflags |= RXSTOPPED;
			memoff(ch);
		}
		restore_flags(flags);

	} /* End if channel valid */

} /* End pc_throttle */

/* --------------------- Begin unthrottle  ----------------------- */

static void pc_unthrottle(struct tty_struct *tty)
{ /* Begin pc_unthrottle */

	struct channel *ch;
	unsigned long flags;
	volatile struct board_chan *bc;


	/* ---------------------------------------------------------
		verifyChannel returns the channel from the tty struct
		if it is valid.  This serves as a sanity check.
	------------------------------------------------------------- */

	if ((ch = verifyChannel(tty)) != NULL) 
	{ /* Begin if channel valid */


		/* Just in case output was resumed because of a change in Digi-flow */
		save_flags(flags);
		cli();

		if (ch->statusflags & RXSTOPPED) 
		{

			globalwinon(ch);
			bc = ch->brdchan;
			fepcmd(ch, RESUMERX, 0, 0, 0, 0);

			ch->statusflags &= ~RXSTOPPED;
			memoff(ch);
		}
		restore_flags(flags);

	} /* End if channel valid */

} /* End pc_unthrottle */

/* --------------------- Begin digi_send_break  ----------------------- */

void digi_send_break(struct channel *ch, int msec)
{ /* Begin digi_send_break */

	unsigned long flags;

	save_flags(flags);
	cli();
	globalwinon(ch);

	/* -------------------------------------------------------------------- 
	   Maybe I should send an infinite break here, schedule() for
	   msec amount of time, and then stop the break.  This way,
	   the user can't screw up the FEP by causing digi_send_break()
	   to be called (i.e. via an ioctl()) more than once in msec amount 
	   of time.  Try this for now...
	------------------------------------------------------------------------ */

	fepcmd(ch, SENDBREAK, msec, 0, 10, 0);
	memoff(ch);

	restore_flags(flags);

} /* End digi_send_break */

/* --------------------- Begin setup_empty_event  ----------------------- */

static void setup_empty_event(struct tty_struct *tty, struct channel *ch)
{ /* Begin setup_empty_event */

	volatile struct board_chan *bc = ch->brdchan;
	unsigned long int flags;

	save_flags(flags);
	cli();
	globalwinon(ch);
	ch->statusflags |= EMPTYWAIT;
	
	/* ------------------------------------------------------------------
		When set the iempty flag request a event to be generated when the 
		transmit buffer is empty (If there is no BREAK in progress).
	--------------------------------------------------------------------- */

	bc->iempty = 1;
	memoff(ch);
	restore_flags(flags);

} /* End setup_empty_event */

/* --------------------- Begin get_termio ----------------------- */

static int get_termio(struct tty_struct * tty, struct termio __user * termio)
{ /* Begin get_termio */
	return kernel_termios_to_user_termio(termio, tty->termios);
} /* End get_termio */
/* ---------------------- Begin epca_setup  -------------------------- */
void epca_setup(char *str, int *ints)
{ /* Begin epca_setup */

	struct board_info board;
	int               index, loop, last;
	char              *temp, *t2;
	unsigned          len;

	/* ----------------------------------------------------------------------
		If this routine looks a little strange it is because it is only called
		if a LILO append command is given to boot the kernel with parameters.  
		In this way, we can provide the user a method of changing his board
		configuration without rebuilding the kernel.
	----------------------------------------------------------------------- */
	if (!liloconfig) 
		liloconfig = 1; 

	memset(&board, 0, sizeof(board));

	/* Assume the data is int first, later we can change it */
	/* I think that array position 0 of ints holds the number of args */
	for (last = 0, index = 1; index <= ints[0]; index++)
		switch(index)
		{ /* Begin parse switch */

			case 1:
				board.status = ints[index];
				
				/* ---------------------------------------------------------
					We check for 2 (As opposed to 1; because 2 is a flag
					instructing the driver to ignore epcaconfig.)  For this
					reason we check for 2.
				------------------------------------------------------------ */ 
				if (board.status == 2)
				{ /* Begin ignore epcaconfig as well as lilo cmd line */
					nbdevs = 0;
					num_cards = 0;
					return;
				} /* End ignore epcaconfig as well as lilo cmd line */
	
				if (board.status > 2)
				{
					printk(KERN_ERR "<Error> - epca_setup: Invalid board status 0x%x\n", board.status);
					invalid_lilo_config = 1;
					setup_error_code |= INVALID_BOARD_STATUS;
					return;
				}
				last = index;
				break;

			case 2:
				board.type = ints[index];
				if (board.type >= PCIXEM) 
				{
					printk(KERN_ERR "<Error> - epca_setup: Invalid board type 0x%x\n", board.type);
					invalid_lilo_config = 1;
					setup_error_code |= INVALID_BOARD_TYPE;
					return;
				}
				last = index;
				break;

			case 3:
				board.altpin = ints[index];
				if (board.altpin > 1)
				{
					printk(KERN_ERR "<Error> - epca_setup: Invalid board altpin 0x%x\n", board.altpin);
					invalid_lilo_config = 1;
					setup_error_code |= INVALID_ALTPIN;
					return;
				}
				last = index;
				break;

			case 4:
				board.numports = ints[index];
				if ((board.numports < 2) || (board.numports > 256))
				{
					printk(KERN_ERR "<Error> - epca_setup: Invalid board numports 0x%x\n", board.numports);
					invalid_lilo_config = 1;
					setup_error_code |= INVALID_NUM_PORTS;
					return;
				}
				nbdevs += board.numports;
				last = index;
				break;

			case 5:
				board.port = (unsigned char *)ints[index];
				if (ints[index] <= 0)
				{
					printk(KERN_ERR "<Error> - epca_setup: Invalid io port 0x%x\n", (unsigned int)board.port);
					invalid_lilo_config = 1;
					setup_error_code |= INVALID_PORT_BASE;
					return;
				}
				last = index;
				break;

			case 6:
				board.membase = (unsigned char *)ints[index];
				if (ints[index] <= 0)
				{
					printk(KERN_ERR "<Error> - epca_setup: Invalid memory base 0x%x\n",(unsigned int)board.membase);
					invalid_lilo_config = 1;
					setup_error_code |= INVALID_MEM_BASE;
					return;
				}
				last = index;
				break;

			default:
				printk(KERN_ERR "<Error> - epca_setup: Too many integer parms\n");
				return;

		} /* End parse switch */

	while (str && *str) 
	{ /* Begin while there is a string arg */

		/* find the next comma or terminator */
		temp = str;

		/* While string is not null, and a comma hasn't been found */
		while (*temp && (*temp != ','))
			temp++;

		if (!*temp)
			temp = NULL;
		else
			*temp++ = 0;

		/* Set index to the number of args + 1 */
		index = last + 1;

		switch(index)
		{
			case 1:
				len = strlen(str);
				if (strncmp("Disable", str, len) == 0) 
					board.status = 0;
				else
				if (strncmp("Enable", str, len) == 0)
					board.status = 1;
				else
				{
					printk(KERN_ERR "<Error> - epca_setup: Invalid status %s\n", str);
					invalid_lilo_config = 1;
					setup_error_code |= INVALID_BOARD_STATUS;
					return;
				}
				last = index;
				break;

			case 2:

				for(loop = 0; loop < EPCA_NUM_TYPES; loop++)
					if (strcmp(board_desc[loop], str) == 0)
						break;


				/* ---------------------------------------------------------------
					If the index incremented above refers to a legitamate board 
					type set it here. 
				------------------------------------------------------------------*/

				if (index < EPCA_NUM_TYPES) 
					board.type = loop;
				else
				{
					printk(KERN_ERR "<Error> - epca_setup: Invalid board type: %s\n", str);
					invalid_lilo_config = 1;
					setup_error_code |= INVALID_BOARD_TYPE;
					return;
				}
				last = index;
				break;

			case 3:
				len = strlen(str);
				if (strncmp("Disable", str, len) == 0) 
					board.altpin = 0;
				else
				if (strncmp("Enable", str, len) == 0)
					board.altpin = 1;
				else
				{
					printk(KERN_ERR "<Error> - epca_setup: Invalid altpin %s\n", str);
					invalid_lilo_config = 1;
					setup_error_code |= INVALID_ALTPIN;
					return;
				}
				last = index;
				break;

			case 4:
				t2 = str;
				while (isdigit(*t2))
					t2++;

				if (*t2)
				{
					printk(KERN_ERR "<Error> - epca_setup: Invalid port count %s\n", str);
					invalid_lilo_config = 1;
					setup_error_code |= INVALID_NUM_PORTS;
					return;
				}

				/* ------------------------------------------------------------
					There is not a man page for simple_strtoul but the code can be 
					found in vsprintf.c.  The first argument is the string to 
					translate (To an unsigned long obviously),  the second argument
					can be the address of any character variable or a NULL.  If a
					variable is given, the end pointer of the string will be stored 
					in that variable; if a NULL is given the end pointer will 
					not be returned.  The last argument is the base to use.  If 
					a 0 is indicated, the routine will attempt to determine the 
					proper base by looking at the values prefix (A '0' for octal,
					a 'x' for hex, etc ...  If a value is given it will use that 
					value as the base. 
				---------------------------------------------------------------- */ 
				board.numports = simple_strtoul(str, NULL, 0);
				nbdevs += board.numports;
				last = index;
				break;

			case 5:
				t2 = str;
				while (isxdigit(*t2))
					t2++;

				if (*t2)
				{
					printk(KERN_ERR "<Error> - epca_setup: Invalid i/o address %s\n", str);
					invalid_lilo_config = 1;
					setup_error_code |= INVALID_PORT_BASE;
					return;
				}

				board.port = (unsigned char *)simple_strtoul(str, NULL, 16);
				last = index;
				break;

			case 6:
				t2 = str;
				while (isxdigit(*t2))
					t2++;

				if (*t2)
				{
					printk(KERN_ERR "<Error> - epca_setup: Invalid memory base %s\n",str);
					invalid_lilo_config = 1;
					setup_error_code |= INVALID_MEM_BASE;
					return;
				}

				board.membase = (unsigned char *)simple_strtoul(str, NULL, 16);
				last = index;
				break;

			default:
				printk(KERN_ERR "PC/Xx: Too many string parms\n");
				return;
		}
		str = temp;

	} /* End while there is a string arg */


	if (last < 6)  
	{
		printk(KERN_ERR "PC/Xx: Insufficient parms specified\n");
		return;
	}
 
	/* I should REALLY validate the stuff here */

	/* Copies our local copy of board into boards */
	memcpy((void *)&boards[num_cards],(void *)&board, sizeof(board));


	/* Does this get called once per lilo arg are what ? */

	printk(KERN_INFO "PC/Xx: Added board %i, %s %i ports at 0x%4.4X base 0x%6.6X\n", 
		num_cards, board_desc[board.type], 
		board.numports, (int)board.port, (unsigned int) board.membase);

	num_cards++;

} /* End epca_setup */



#ifdef ENABLE_PCI
/* ------------------------ Begin init_PCI  --------------------------- */

enum epic_board_types {
	brd_xr = 0,
	brd_xem,
	brd_cx,
	brd_xrj,
};


/* indexed directly by epic_board_types enum */
static struct {
	unsigned char board_type;
	unsigned bar_idx;		/* PCI base address region */
} epca_info_tbl[] = {
	{ PCIXR, 0, },
	{ PCIXEM, 0, },
	{ PCICX, 0, },
	{ PCIXRJ, 2, },
};


static int __devinit epca_init_one (struct pci_dev *pdev,
				 const struct pci_device_id *ent)
{
	static int board_num = -1;
	int board_idx, info_idx = ent->driver_data;
	unsigned long addr;

	if (pci_enable_device(pdev))
		return -EIO;

	board_num++;
	board_idx = board_num + num_cards;
	if (board_idx >= MAXBOARDS)
		goto err_out;
	
	addr = pci_resource_start (pdev, epca_info_tbl[info_idx].bar_idx);
	if (!addr) {
		printk (KERN_ERR PFX "PCI region #%d not available (size 0)\n",
			epca_info_tbl[info_idx].bar_idx);
		goto err_out;
	}

	boards[board_idx].status = ENABLED;
	boards[board_idx].type = epca_info_tbl[info_idx].board_type;
	boards[board_idx].numports = 0x0;
	boards[board_idx].port =
		(unsigned char *)((char *) addr + PCI_IO_OFFSET);
	boards[board_idx].membase =
		(unsigned char *)((char *) addr);

	if (!request_mem_region (addr + PCI_IO_OFFSET, 0x200000, "epca")) {
		printk (KERN_ERR PFX "resource 0x%x @ 0x%lx unavailable\n",
			0x200000, addr + PCI_IO_OFFSET);
		goto err_out;
	}

	boards[board_idx].re_map_port = ioremap(addr + PCI_IO_OFFSET, 0x200000);
	if (!boards[board_idx].re_map_port) {
		printk (KERN_ERR PFX "cannot map 0x%x @ 0x%lx\n",
			0x200000, addr + PCI_IO_OFFSET);
		goto err_out_free_pciio;
	}

	if (!request_mem_region (addr, 0x200000, "epca")) {
		printk (KERN_ERR PFX "resource 0x%x @ 0x%lx unavailable\n",
			0x200000, addr);
		goto err_out_free_iounmap;
	}

	boards[board_idx].re_map_membase = ioremap(addr, 0x200000);
	if (!boards[board_idx].re_map_membase) {
		printk (KERN_ERR PFX "cannot map 0x%x @ 0x%lx\n",
			0x200000, addr + PCI_IO_OFFSET);
		goto err_out_free_memregion;
	}

	/* --------------------------------------------------------------
		I don't know what the below does, but the hardware guys say
		its required on everything except PLX (In this case XRJ).
	---------------------------------------------------------------- */
	if (info_idx != brd_xrj) {
		pci_write_config_byte(pdev, 0x40, 0);  
		pci_write_config_byte(pdev, 0x46, 0);
	}
	
	return 0;

err_out_free_memregion:
	release_mem_region (addr, 0x200000);
err_out_free_iounmap:
	iounmap (boards[board_idx].re_map_port);
err_out_free_pciio:
	release_mem_region (addr + PCI_IO_OFFSET, 0x200000);
err_out:
	return -ENODEV;
}


static struct pci_device_id epca_pci_tbl[] = {
	{ PCI_VENDOR_DIGI, PCI_DEVICE_XR, PCI_ANY_ID, PCI_ANY_ID, 0, 0, brd_xr },
	{ PCI_VENDOR_DIGI, PCI_DEVICE_XEM, PCI_ANY_ID, PCI_ANY_ID, 0, 0, brd_xem },
	{ PCI_VENDOR_DIGI, PCI_DEVICE_CX, PCI_ANY_ID, PCI_ANY_ID, 0, 0, brd_cx },
	{ PCI_VENDOR_DIGI, PCI_DEVICE_XRJ, PCI_ANY_ID, PCI_ANY_ID, 0, 0, brd_xrj },
	{ 0, }
};

MODULE_DEVICE_TABLE(pci, epca_pci_tbl);

int __init init_PCI (void)
{ /* Begin init_PCI */
	memset (&epca_driver, 0, sizeof (epca_driver));
	epca_driver.name = "epca";
	epca_driver.id_table = epca_pci_tbl;
	epca_driver.probe = epca_init_one;

	return pci_register_driver(&epca_driver);
} /* End init_PCI */

#endif /* ENABLE_PCI */

MODULE_LICENSE("GPL");