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Text File  |  1996-04-05  |  2.6 KB  |  107 lines
  1. /*
  2.  * Copyright (c) 1993-1996 NeXT Software, Inc.
  3.  *
  4.  * AHAController.h. - class definition for Adaptec 1542 driver.
  5.  *
  6.  * HISTORY
  7.  *
  8.  * 13 Apr 1993    Doug Mitchell at NeXT
  9.  *    Created from Brian Pinkerton's Adaptec driver. 
  10.  */
  11.  
  12.  
  13. #import <driverkit/IODevice.h>
  14. #import <driverkit/IODeviceDescription.h>
  15. #import <driverkit/return.h>
  16. #import <driverkit/scsiTypes.h>
  17. #import <driverkit/IOSCSIController.h>
  18. #import <driverkit/i386/directDevice.h>
  19. #import "AHAControllerPrivate.h"
  20. #import "AHATypes.h"
  21.  
  22.  
  23. @interface AHAController : IOSCSIController 
  24. {
  25.     /*
  26.      * Hardware info.
  27.      */
  28.     struct aha_config     config;        /* config info from device */
  29.     IOEISAPortAddress     ioBase;        /* base IO port addr */
  30.     unsigned char         ahaBoardId;
  31.     BOOL            ioThreadRunning;
  32.     
  33.     /*
  34.      * mailbox and CCB areas. Dynamically allocated from low 
  35.      * 16 MB of memory.
  36.      */  
  37.     struct aha_mb_area    *ahaMbArea;
  38.     struct ccb        *ahaCcb;
  39.     int            numFreeCcbs;    /* number of free CCBs */
  40.  
  41.     /*
  42.      * Three queues:
  43.      * 
  44.      * commandQ:     contains AHACommandBuf's to be executed by the 
  45.      *         I/O thread. Enqueued by exported methods (via
  46.      *         -executeCmdBuf); dequeued by the I/O thread in
  47.      *         -commandRequestOccurred.
  48.      *
  49.      * outstandingQ: contains ccb's on which the controller is
  50.      *          currently operating. The number of ccb's in
  51.      *         outstandingQ is outstandingCount. Ccb's are 
  52.      *         enqueued here by -runPendingCommands. 
  53.      *
  54.      * pendingQ:     contains ccb's which the I/O thread is holding
  55.      *         on to because outstandingCount == AHA_QUEUE_SIZE.
  56.      *         Ccb's are enqueued here by -threadExecuteRequest:.
  57.      *
  58.      */
  59.     queue_head_t    commandQ;        /* list of waiting
  60.                          * AHACommandBuf's */
  61.     id        commandLock;        /* NXLock; protects commandQ */
  62.     queue_head_t    outstandingQ;        /* list of running cmds */
  63.     unsigned int    outstandingCount;    /* length of outstandingQ */
  64.     queue_head_t    pendingQ;
  65.     
  66.     /*
  67.      * Local reference count for reserveDMALock.
  68.      */ 
  69.     unsigned    dmaLockCount;        
  70.     
  71.     /*
  72.      * Statistics counters.
  73.      */ 
  74.     unsigned int    maxQueueLen;
  75.     unsigned int    queueLenTotal;
  76.     unsigned int    totalCommands;
  77.     
  78.     port_t        interruptPortKern;    /* kernel version of 
  79.                          * interruptPort */
  80. }
  81.  
  82. /*
  83.  * Standard IODirectDevice methods overridden here.
  84.  */
  85. + (BOOL)probe:deviceDescription;
  86. - initFromDeviceDescription    : deviceDescription;
  87. - (unsigned)maxTransfer;
  88. - free;
  89. - (void)interruptOccurred;    
  90. - (void)interruptOccurredAt:(int)localNum;
  91. - (void)otherOccurred:(int)id;
  92. - (void)receiveMsg;
  93. - (void)timeoutOccurred;
  94. - (void)commandRequestOccurred;
  95.  
  96. /*
  97.  * IOSCSIControllerExported methods implemented here.
  98.  */
  99. - (sc_status_t) executeRequest     : (IOSCSIRequest *)scsiReq 
  100.                  buffer : (void *)buffer 
  101.                  client : (vm_task_t)client;
  102. - (sc_status_t)resetSCSIBus;
  103.  
  104. @end
  105.  
  106.  
  107.