262 lines
7.2 KiB
C
262 lines
7.2 KiB
C
/*****************************************************************************
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*
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* COPYRIGHT 1993 - COLORADO MEMORY SYSTEMS, INC.
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* ALL RIGHTS RESERVED.
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*
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******************************************************************************
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*
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* FILE: \SE\DRIVER\DEVICE\JUMBO\SRC\0X11041.C
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*
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* FUNCTION: cqd_SendByte
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*
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* PURPOSE: Transmit a command to the tape drive using step pulses
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* generated by the FDC.
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*
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* Using the Present Cylinder Number (pcn) of the FDC
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* calculate a New Cylinder Number (ncn) that will make
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* the FDC generate the number of step pulses corresponding
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* to the command byte.
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*
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* Execute a Seek with the FDC.
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*
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* Sense Interrupt dStatus of the FDC and make sure that the
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* pcn concurs with the ncn, which indicates that the correct
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* number of step pulses were issued.
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*
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* HISTORY:
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* $Log: J:\se.vcs\driver\q117cd\src\0x11041.c $
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*
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* Rev 1.14 20 Apr 1994 16:28:20 BOBLEHMA
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* Added a call to kdi_QIC117ClearIRQ for the case when sleep returns from
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* a timeout, (after the sense interrupt status). There are cases when the
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* sleep returns from a timeout, but the interrupt in the trakker is still
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* latched and must be cleared.
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*
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* Rev 1.13 23 Feb 1994 17:08:34 KEVINKES
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* Added a reset FDC to the endo fo send byte to clear out any
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* state errors in the controller due to a timeout on the seek
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* interrupt.
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*
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* Rev 1.12 04 Feb 1994 14:27:24 KURTGODW
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* Changed ifdef dbg to if dbg for NT
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*
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* Rev 1.11 27 Jan 1994 15:48:34 KEVINKES
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* Modified debug code.
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*
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* Rev 1.10 21 Jan 1994 18:23:12 KEVINKES
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* Fixed compiler warnings.
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*
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* Rev 1.9 18 Jan 1994 16:19:08 KEVINKES
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* Updated debug code.
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*
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* Rev 1.8 11 Jan 1994 15:20:18 KEVINKES
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* Added call to CLearInterruptEvent.
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*
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* Rev 1.7 13 Dec 1993 16:01:00 KEVINKES
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* Removed the format code.
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*
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* Rev 1.6 23 Nov 1993 18:49:08 KEVINKES
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* Modified CHECKED_DUMP calls for debugging over the serial port.
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*
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* Rev 1.5 15 Nov 1993 16:20:42 KEVINKES
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* Added abort handling.
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*
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* Rev 1.4 12 Nov 1993 13:43:36 KEVINKES
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* Removed the abort code.
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*
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* Rev 1.3 11 Nov 1993 15:20:56 KEVINKES
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* Changed calls to cqd_inp and cqd_outp to kdi_ReadPort and kdi_WritePort.
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* Modified the parameters to these calls. Changed FDC commands to be
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* defines.
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*
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* Rev 1.2 08 Nov 1993 14:05:58 KEVINKES
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* Removed all bit-field structures, removed all enumerated types, changed
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* all defines to uppercase, and removed all signed data types wherever
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* possible.
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*
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* Rev 1.1 25 Oct 1993 14:24:32 KEVINKES
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* Added a sense interrupt status for timeout errors.
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*
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* Rev 1.0 18 Oct 1993 17:25:40 KEVINKES
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* Initial Revision.
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*
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*****************************************************************************/
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#define FCT_ID 0x11041
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#include "include\public\adi_api.h"
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#include "include\public\frb_api.h"
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#include "include\private\kdi_pub.h"
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#include "include\private\cqd_pub.h"
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#include "q117cd\include\cqd_defs.h"
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#include "q117cd\include\cqd_strc.h"
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#include "q117cd\include\cqd_hdr.h"
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/*endinclude*/
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dStatus cqd_SendByte
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(
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/* INPUT PARAMETERS: */
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CqdContextPtr cqd_context,
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dUByte command
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/* UPDATE PARAMETERS: */
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/* OUTPUT PARAMETERS: */
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)
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/* COMMENTS: *****************************************************************
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*
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* DEFINITIONS: *************************************************************/
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{
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/* DATA: ********************************************************************/
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dStatus status=DONT_PANIC; /* dStatus or error condition.*/
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SeekCmd seek;
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SnsIntCmd sense_int;
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FDCResult result;
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#if DBG
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dBoolean save;
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#endif
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/* CODE: ********************************************************************/
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#if DBG
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/* Lockout commands used to receive the status */
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save = cqd_context->dbg_lockout;
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cqd_context->dbg_lockout = dTRUE;
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#endif
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if (command >= MAX_FDC_SEEK) {
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#if DBG
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cqd_context->dbg_lockout = save;
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#endif
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return kdi_Error(ERR_INVALID_COMMAND, FCT_ID, ERR_SEQ_1);
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}
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if (cqd_context->controller_data.fdc_pcn < MAX_FDC_SEEK) {
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seek.NCN = (dUByte)(cqd_context->controller_data.fdc_pcn + command);
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} else {
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seek.NCN = (dUByte)(cqd_context->controller_data.fdc_pcn - command);
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}
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seek.cmd = FDC_CMD_SEEK;
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seek.drive = (dUByte)cqd_context->device_cfg.drive_select;
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kdi_ResetInterruptEvent(cqd_context->kdi_context);
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if ((status = cqd_ProgramFDC(
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cqd_context,
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(dUByte *)&seek,
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sizeof(seek),
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dFALSE)) != DONT_PANIC) {
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kdi_ClearInterruptEvent(cqd_context->kdi_context);
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#if DBG
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cqd_context->dbg_lockout = save;
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#endif
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cqd_ResetFDC(cqd_context);
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return status;
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}
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/* For some unknown reason, we occasionally miss an interrupt. */
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/* Despite the timeout, we still press on as if we received the interrupt. */
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/* Therefore, we go ahead and perform the sense interrupt status. If */
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/* status register 0 is bad, then we assume that we truly did miss the */
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/* interrupt. Otherwise, we go on as if nothing happened. */
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status = kdi_Sleep(cqd_context->kdi_context, kdi_wt001s, dTRUE);
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if (kdi_GetErrorType(status) == ERR_KDI_TO_EXPIRED) {
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sense_int.command = FDC_CMD_SENSE_INT;
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status = cqd_ProgramFDC(cqd_context,
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(dUByte *)&sense_int,
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sizeof(SnsIntCmd),
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dFALSE);
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kdi_QIC117ClearIRQ( cqd_context->kdi_context );
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}
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if (status == DONT_PANIC) {
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if ((status = cqd_ReadFDC(
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cqd_context,
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(dUByte *)&result,
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sizeof(result))) != DONT_PANIC) {
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#if DBG
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cqd_context->dbg_lockout = save;
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#endif
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return status;
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} else {
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/* If the sense interrupt status is O.K., then proceed as if */
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/* nothing happened. If, however, there is an error returned by */
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/* status register 0, then return a FDCFLT. */
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if (! (result.ST0 & ST0_IC)) {
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/* If we timed out, then we did the sense interrupt status */
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/* without clearing the interrupt from the interrupt controller. */
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/* Since the FDC did not indicate an error, we assume that we */
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/* missed the interrupt and send the EOI. Only needed for an */
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/* 82072. */
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if (kdi_GetInterfaceType(cqd_context->kdi_context) != MICRO_CHANNEL) {
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if (result.ST0 !=
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(dUByte)(cqd_context->device_cfg.drive_select | ST0_SE)) {
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#if DBG
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cqd_context->dbg_lockout = save;
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#endif
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return kdi_Error(ERR_FDC_FAULT, FCT_ID, ERR_SEQ_1);
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}
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}
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if (seek.NCN != result.PCN) {
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#if DBG
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cqd_context->dbg_lockout = save;
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#endif
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return kdi_Error(ERR_CMD_FAULT, FCT_ID, ERR_SEQ_1);
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}
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cqd_context->controller_data.fdc_pcn = result.PCN;
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} else {
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#if DBG
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cqd_context->dbg_lockout = save;
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#endif
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return kdi_Error(ERR_FDC_FAULT, FCT_ID, ERR_SEQ_2);
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}
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}
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} else {
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cqd_ResetFDC(cqd_context);
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}
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#if DBG
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cqd_context->dbg_lockout = save;
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DBG_ADD_ENTRY(QIC117SHOWMCMDS, (CqdContextPtr)cqd_context, DBG_SEND_BYTE);
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DBG_ADD_ENTRY(QIC117SHOWMCMDS, (CqdContextPtr)cqd_context, (dUByte)command);
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#endif
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return status;
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}
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