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Annotation of ntddk/src/scsi/qic117/readfdc.c, revision 1.1

1.1     ! root        1: /*++
        !             2: 
        !             3: Copyright (c) 1993 - Colorado Memory Systems, Inc.
        !             4: All Rights Reserved
        !             5: 
        !             6: Module Name:
        !             7: 
        !             8:     readfdc.c
        !             9: 
        !            10: Abstract:
        !            11: 
        !            12:     Read FDC result bytes.
        !            13: 
        !            14: Revision History:
        !            15: 
        !            16: 
        !            17: 
        !            18: 
        !            19: --*/
        !            20: 
        !            21: //
        !            22: // include files
        !            23: //
        !            24: 
        !            25: #include <ntddk.h>                        // various NT definitions
        !            26: #include <ntdddisk.h>                    // disk device driver I/O control codes
        !            27: #include <ntiologc.h>
        !            28: #include "common.h"
        !            29: #include "drvtask.h"                     // this driver's data declarations
        !            30: #include "mt1defs.h"                     // this driver's data declarations
        !            31: #include "mt1strc.h"                     // this driver's data declarations
        !            32: #include "q117data.h"                    // this driver's data declarations
        !            33: 
        !            34: 
        !            35: STATUS
        !            36: Q117iReadFDC(
        !            37:     IN PTAPE_EXTENSION TapeExtension,
        !            38:     OUT UCHAR *Status,
        !            39:     OUT SHORT *Length
        !            40:     )
        !            41: 
        !            42: /*++
        !            43: 
        !            44: Routine Description:
        !            45: 
        !            46:     Read result data from the Floppy Disk Controller.  The result data
        !            47:     is read during the result phase of the FDC command sequence.
        !            48: n
        !            49:         For each byte of response data, wait up to 3 msecs for the FDC to
        !            50:         become ready.
        !            51: 
        !            52:         Read result data until the FDC is no longer sending data or until
        !            53:         more than 7 result bytes have been read.  Seven is the maximum
        !            54:         legal number of result bytes that the FDC is specified to send.
        !            55: 
        !            56: Arguments:
        !            57: 
        !            58:     TapeExtension -
        !            59: 
        !            60:     Status -
        !            61: 
        !            62:     Length -
        !            63: 
        !            64: Return Value:
        !            65: 
        !            66: 
        !            67: 
        !            68: --*/
        !            69: 
        !            70: {
        !            71: 
        !            72:     SHORT mainStatusRegister;
        !            73:     SHORT waitCount;
        !            74: 
        !            75:     *Length = 0;
        !            76: 
        !            77:     DbgAddEntry(0x12345679);
        !            78: 
        !            79:     if (TapeExtension->QControllerData->CommandHasResultPhase) {
        !            80: 
        !            81:         *Status++ = TapeExtension->QControllerData->FifoByte;
        !            82:         DbgAddEntry(TapeExtension->QControllerData->FifoByte);
        !            83:         ++*Length;
        !            84: 
        !            85:     }
        !            86: 
        !            87: 
        !            88:     do {
        !            89: 
        !            90:         waitCount = FDC_MSR_RETRIES;
        !            91: 
        !            92:         do {
        !            93: 
        !            94:             if ((mainStatusRegister =
        !            95:                 READ_CONTROLLER(
        !            96:                     &TapeExtension->QControllerData->FDC_Addr->MSDSR.msr )) &
        !            97:                 MSR_RQM) {
        !            98: 
        !            99:                 break;
        !           100: 
        !           101:             }
        !           102: 
        !           103:             Q117iShortTimer(t0012us);
        !           104: 
        !           105:         } while (--waitCount > 0);
        !           106: 
        !           107:         if (waitCount == 0) {
        !           108: 
        !           109:             return(NECFlt);
        !           110: 
        !           111:         }
        !           112: 
        !           113:         if (!(mainStatusRegister & MSR_DIO)) {
        !           114: 
        !           115:             break;
        !           116: 
        !           117:         }
        !           118: 
        !           119:         *Status = (CHAR)READ_CONTROLLER(
        !           120:                             &TapeExtension->QControllerData->FDC_Addr->dr);
        !           121: 
        !           122: 
        !           123:         DbgAddEntry(*Status);
        !           124: 
        !           125:         ++Status;
        !           126: 
        !           127:         if (++*Length > 7) {
        !           128:             *Length = -1;
        !           129:             break;
        !           130: 
        !           131:         }
        !           132: 
        !           133:         Q117iShortTimer(t0012us);
        !           134: 
        !           135:     } while (TRUE);
        !           136: 
        !           137:     return(NoErr);
        !           138: }
        !           139: 

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