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Darwin 0.3 EIDE device driver

/*
 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
 * Reserved.  This file contains Original Code and/or Modifications of
 * Original Code as defined in and that are subject to the Apple Public
 * Source License Version 1.0 (the 'License').  You may not use this file
 * except in compliance with the License.  Please obtain a copy of the
 * License at http://www.apple.com/publicsource and read it before using
 * this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License."
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * Copyright 1997-1998 by Apple Computer, Inc., All rights reserved.
 * Copyright 1994-1997 NeXT Software, Inc., All rights reserved.
 *
 * AtapiCnt.h - Interface for ATAPI controller class. 
 *
 * HISTORY 
 * 31-Aug-1994 	Rakesh Dubey at NeXT 
 *	Created.
 */

#ifndef _ATAPI_CNT_H
#define _ATAPI_CNT_H 1

#import <driverkit/scsiTypes.h>
#import <driverkit/IOSCSIController.h>
#import "AtapiCntCmds.h"

/*
 * We will preallocate command buffers for doing I/O. This avoids a deadlock
 * situation when we are running very low on memory. Comment out this #define
 * if this behavior is not desired.
 */
#define NO_ATAPI_RUNTIME_MEMORY_ALLOCATION

/*
 * Commands to be executed by I/O thread.
 */
typedef enum {
    ATAPI_CNT_IOREQ,			/* process IdeIoReq_t */
    ATAPI_CNT_ABORT,			/* abort pending "needsDisk" I/Os */
    ATAPI_CNT_THREAD_ABORT,		/* thread abort */
} atapiCmd_t;

/*
 * Command buffer. These are enqueued on one of the I/O queues by exported
 * methods and dequeued and processed by the I/O thread.
 */
typedef  struct {
    atapiCmd_t		command;		/* IOREQ or abort */
    atapiIoReq_t 	*atapiIoReq;	/* command block passed to controller */
    void 			*buffer;
    vm_task_t		client;
    id				waitLock;		/* NXConditionLock  */
    sc_status_t		status;
    queue_chain_t	link;
    queue_chain_t	bufLink;
} atapiBuf_t;

/*
 * Mode sense/select - Mode Parameter Header.
 */
typedef struct {
	unsigned char mdl1;		// mode data length MSB
	unsigned char mdl0;		// mode data length LSB
	unsigned char mt;		// medium type
	unsigned char rsvd0;
	unsigned char rsvd1;
	unsigned char rsvd2;
	unsigned char rsvd3;
	unsigned char rsvd4;
} atapiMPH_t;

/*
 * Mode sense/select - Mode Parameter List.
 */
typedef struct {
	atapiMPH_t 		mph;
	unsigned char	pageData[MODSEL_DATA_LEN * 2];
} atapiMPL_t;

@interface AtapiController:IOSCSIController
{
@private
    /*
     * The queues on which all I/Os are enqueued by exported methods. 
     */
    queue_head_t	_ioQueueNodisk;	/* for all I/O */

#ifdef NO_ATAPI_RUNTIME_MEMORY_ALLOCATION
    queue_head_t	_atapiBufQueue;
    id			_atapiBufLock;
#define MAX_NUM_ATAPIBUF		64
    atapiBuf_t		_atapiBufPool[MAX_NUM_ATAPIBUF];
#endif NO_ATAPI_RUNTIME_MEMORY_ALLOCATION

    /*
     * NXConditionLock - protects the queues; I/O thread sleeps on this. 
     */
    id 			_ioQLock;
    
    id	_ataController;			/* ATA controller */

	/*
	 * Mode sense/select Mode Parameter List. Used to translate
	 * from ATAPI format to SCSI or vice-versa.
	 */
	atapiMPL_t 	modeData;
}

+ (BOOL)probe : deviceDescription;
+ (IODeviceStyle)deviceStyle;		/* override IOSCSIController	*/
+ (Protocol **)requiredProtocols;

- (sc_status_t) executeRequest 	: (IOSCSIRequest *)scsiReq 
			buffer : (void *)buffer 
			client : (vm_task_t)client;
			 
- (BOOL) maptoAtapiCmd:(atapiIoReq_t *)atapiIoReq	/* map SCSI -> ATAPI */
		 buffer:(void *)buffer newBuffer:(atapiMPL_t *)mode;	

- (BOOL) maptoSCSICmd:(atapiIoReq_t *)atapiIoReq buffer:(void *)buffer
		 newBuffer:(atapiMPL_t *)mode;

- (BOOL) emulateSCSICmd:(atapiIoReq_t *)atapiIoReq 
		 buffer:(void *)buffer;		/* fake these */

- (sc_status_t)resetSCSIBus;

@end

/*
 * So that we can use ATAPI naming convention and still use the ATA
 * registers.
 */
#define InterruptReason		sectCnt
#define byteCountLow		cylLow
#define byteCountHigh		cylHigh
#define driveSelect		drHead

#define ATAPI_NLUNS		1

#endif /* _ATAPI_CNT_H */

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