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Annotation of kernel/bsd/dev/ppc/drvApple96_SCSI/Apple96CurioDBDMA.m, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /**
        !            26:  * Copyright (c) 1994-1996 NeXT Software, Inc.  All rights reserved. 
        !            27:  * Copyright 1997 Apple Computer Inc. All Rights Reserved.
        !            28:  * @author     Martin Minow    mailto:[email protected]
        !            29:  * @revision   1997.02.13      Initial conversion from AMDPCSCSIDriver sources.
        !            30:  *
        !            31:  * Set tabs every 4 characters.
        !            32:  *
        !            33:  * Apple96PCIDBDMA.h - Minimal DBDMA Handler for the Apple 96 PCI driver. This is
        !            34:  * a temporary file until "real" DBDMA support appears.
        !            35:  *
        !            36:  * Edit History
        !            37:  * 1997.02.13  MM  Initial conversion from AMDPCSCSIDriver sources. 
        !            38:  * 1997.07.18  MM  Added USE_CURIO_METHODS and wrote macros for the
        !            39:  *         one-liner methods.
        !            40:  */
        !            41: #import "Apple96SCSI.h"
        !            42: #import <driverkit/generalFuncs.h>
        !            43: #import <driverkit/kernelDriver.h>
        !            44: #import "Apple96CurioDBDMA.h"
        !            45: #import <mach/mach_interface.h>
        !            46: 
        !            47: /**
        !            48:  * These methods implement a minimal DBDMA support library for Curio.
        !            49:  */
        !            50: @implementation Apple96_SCSI(Curio_DBDMA)
        !            51: 
        !            52: /**
        !            53:  * Quit: stop the DBDMA controller and free all memory.
        !            54:  * Never done as a macro.
        !            55:  */
        !            56: - (void) dbdmaTerminate
        !            57: {
        !            58:                if (gDBDMALogicalAddress != NULL) {
        !            59:            DBDMAreset();
        !            60:                }
        !            61:                if (gChannelCommandArea != NULL) {
        !            62:                        IOFree(gChannelCommandArea, gChannelCommandAreaSize);
        !            63:                        gChannelCommandArea = NULL;
        !            64:        }   
        !            65: }
        !            66: 
        !            67: #if USE_CURIO_METHODS
        !            68: 
        !            69: /**
        !            70:  * Stop the DBDMA controller
        !            71:  */
        !            72: - (void) dbdmaReset
        !            73: {
        !            74:        __DBDMAreset();
        !            75: }
        !            76: 
        !            77: /**
        !            78:  * Start a DMA operation.
        !            79:  */
        !            80: - (void) dbdmaStartTransfer
        !            81: {
        !            82:        __DBDMAstartTransfer(); 
        !            83: }
        !            84: 
        !            85: /**
        !            86:  * Stop a DMA operation.
        !            87:  */
        !            88: - (void) dbdmaStopTransfer
        !            89: {
        !            90:        __DBDMAstopTransfer();
        !            91: }
        !            92: 
        !            93: /**
        !            94:  * Spin-wait until the DBDMA channel is inactive. This should be
        !            95:  * timed to prevent deadlock.
        !            96:  */
        !            97: - (void) dbdmaSpinUntilIdle
        !            98: {
        !            99:        ENTRY("dbd dbdmaSpinUntilIdle");
        !           100:        __DBDMAspinUntilIdle();
        !           101:        EXIT();
        !           102: }
        !           103: #endif /* USE_CURIO_METHODS */
        !           104: 
        !           105: @end   /* Apple96_SCSI(Curio_DBDMA) */

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