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Annotation of ntddk/src/scsi/qic117/pgmfdc.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:     pgmfdc.c
        !             9: 
        !            10: Abstract:
        !            11: 
        !            12:     FDC program logic.
        !            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: Q117iProgramFDC(
        !            37:     IN PTAPE_EXTENSION TapeExtension,
        !            38:     IN OUT UCHAR *Command,
        !            39:     IN SHORT Length,
        !            40:     IN BOOLEAN Result
        !            41:     )
        !            42: 
        !            43: /*++
        !            44: 
        !            45: Routine Description:
        !            46: 
        !            47: Send a command to the Floppy Disk Controller.  Commands are of
        !            48: various lengths as defined by the FDC spec (NEC uPD765A).
        !            49: 
        !            50: For each byte in the command string, program_nec must wait for the
        !            51: FDC to become ready to read command data.  Program_nec will wait
        !            52: up to approx. 3 msecs before giving up and declaring an error.
        !            53: 
        !            54: Arguments:
        !            55: 
        !            56: TapeExtension -
        !            57: 
        !            58: Command -
        !            59: 
        !            60: Length -
        !            61: 
        !            62: Result -
        !            63: 
        !            64: Return Value:
        !            65: 
        !            66: 
        !            67: 
        !            68: --*/
        !            69: 
        !            70: {
        !            71:     SHORT i;
        !            72:     SHORT waitCount;
        !            73: 
        !            74:     TapeExtension->QControllerData->CommandHasResultPhase = Result;
        !            75: 
        !            76:     DbgAddEntry(0x12345678);
        !            77: 
        !            78:     for (i = 0; i < Length; i++) {
        !            79: 
        !            80:         waitCount = FDC_MSR_RETRIES;
        !            81: 
        !            82:         do {
        !            83: 
        !            84:             if ((READ_CONTROLLER(
        !            85:                     &TapeExtension->QControllerData->FDC_Addr->MSDSR.msr) &
        !            86:                 (MSR_RQM | MSR_DIO)) == MSR_RQM) {
        !            87: 
        !            88:                 break;
        !            89: 
        !            90:             }
        !            91: 
        !            92:             Q117iShortTimer(t0012us);
        !            93: 
        !            94:         } while (--waitCount > 0);
        !            95: 
        !            96:         if (waitCount == 0) {
        !            97: 
        !            98:             return(NECFlt);
        !            99: 
        !           100:         }
        !           101: 
        !           102:         WRITE_CONTROLLER(
        !           103:             &TapeExtension->QControllerData->FDC_Addr->dr,
        !           104:             (SHORT)Command[i]);
        !           105: 
        !           106:         DbgAddEntry(Command[i]);
        !           107: 
        !           108:         Q117iShortTimer(t0012us);
        !           109:     }
        !           110: 
        !           111:     return(NoErr);
        !           112: }

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