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Annotation of driverkit/libDriver/ppc/IODBDMA.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:  * Copyright (c) 1997 Apple Computer, Inc.
        !            26:  *
        !            27:  *
        !            28:  * HISTORY
        !            29:  *
        !            30:  * Simon Douglas  10 Nov 97
        !            31:  * - first checked in, mostly from machdep/ppc/dbdma.c
        !            32:  *
        !            33:  */
        !            34: 
        !            35: 
        !            36: #import        <driverkit/ppc/IODBDMA.h>
        !            37: 
        !            38: 
        !            39: void
        !            40: IODBDMAStart( volatile IODBDMAChannelRegisters *registers, volatile IODBDMADescriptor *physicalDescPtr)
        !            41: {
        !            42: 
        !            43:     if( ((int) physicalDescPtr) & 0xf)
        !            44:        panic("IODBDMAStart: unaligned IODBDMADescriptor");
        !            45: 
        !            46:     eieio();
        !            47:     IOSetDBDMAInterruptSelect(registers, 0xff000000);          // clear out interrupts
        !            48: 
        !            49:     IOSetDBDMAChannelControl( registers,
        !            50:        IOClearDBDMAChannelControlBits( kdbdmaRun | kdbdmaPause | kdbdmaFlush | kdbdmaWake | kdbdmaDead | kdbdmaActive ));
        !            51: 
        !            52:     while( IOGetDBDMAChannelStatus( registers) & kdbdmaActive)
        !            53:        eieio();
        !            54: 
        !            55:     IOSetDBDMACommandPtr( registers, (unsigned int) physicalDescPtr);
        !            56: 
        !            57:     IOSetDBDMAChannelControl( registers,
        !            58:        IOSetDBDMAChannelControlBits( kdbdmaRun | kdbdmaWake ));
        !            59: 
        !            60: }
        !            61: 
        !            62: void
        !            63: IODBDMAStop( volatile IODBDMAChannelRegisters *registers)
        !            64: {
        !            65: 
        !            66:     IOSetDBDMAChannelControl( registers,
        !            67:          IOClearDBDMAChannelControlBits( kdbdmaRun )
        !            68:        | IOSetDBDMAChannelControlBits(  kdbdmaFlush ));
        !            69: 
        !            70:     while( IOGetDBDMAChannelStatus( registers) & ( kdbdmaActive | kdbdmaFlush))
        !            71:        eieio();
        !            72: 
        !            73: }
        !            74: 
        !            75: void
        !            76: IODBDMAFlush( volatile IODBDMAChannelRegisters *registers)
        !            77: {
        !            78: 
        !            79:     IOSetDBDMAChannelControl( registers,
        !            80:         IOSetDBDMAChannelControlBits(  kdbdmaFlush ));
        !            81: 
        !            82:     while( IOGetDBDMAChannelStatus( registers) & kdbdmaFlush)
        !            83:        eieio();
        !            84: 
        !            85: }
        !            86: 
        !            87: void
        !            88: IODBDMAReset( volatile IODBDMAChannelRegisters *registers)
        !            89: {
        !            90: 
        !            91:     IOSetDBDMAChannelControl( registers,
        !            92:        IOClearDBDMAChannelControlBits( kdbdmaRun | kdbdmaPause | kdbdmaFlush | kdbdmaWake | kdbdmaDead | kdbdmaActive ));
        !            93: 
        !            94:     while( IOGetDBDMAChannelStatus( registers) & kdbdmaActive)
        !            95:        eieio();
        !            96: 
        !            97: }
        !            98: 
        !            99: void
        !           100: IODBDMAContinue( volatile IODBDMAChannelRegisters *registers)
        !           101: {
        !           102: 
        !           103:     IOSetDBDMAChannelControl( registers,
        !           104:          IOClearDBDMAChannelControlBits( kdbdmaPause | kdbdmaDead )
        !           105:        | IOSetDBDMAChannelControlBits(  kdbdmaRun | kdbdmaWake ));
        !           106: 
        !           107: }
        !           108: 
        !           109: void
        !           110: IODBDMAPause( volatile IODBDMAChannelRegisters *registers)
        !           111: {
        !           112: 
        !           113:     IOSetDBDMAChannelControl( registers,
        !           114:         IOSetDBDMAChannelControlBits(  kdbdmaPause ));
        !           115: 
        !           116:     while( IOGetDBDMAChannelStatus( registers) & kdbdmaActive)
        !           117:        eieio();
        !           118: 
        !           119: }
        !           120: 
        !           121: IOReturn
        !           122: IOAllocatePhysicallyContiguousMemory(
        !           123:                unsigned int size, unsigned int options,
        !           124:                IOVirtualAddress * logical, IOPhysicalAddress * physical )
        !           125: {
        !           126:     IOReturn           err;
        !           127:     vm_offset_t                mem;
        !           128: 
        !           129:     if( (size > 4096) || (options))
        !           130:        return( IO_R_UNSUPPORTED);
        !           131: 
        !           132:     mem = (vm_offset_t) IOMalloc( size);
        !           133:     *logical = (IOVirtualAddress) mem;
        !           134: 
        !           135:     if( mem) {
        !           136:        err = IOPhysicalFromVirtual( IOVmTaskSelf(), mem, (vm_offset_t *) physical);
        !           137:        if( err)
        !           138:            IOFree( (char *)mem, size);
        !           139: 
        !           140:     } else {
        !           141:        err = IO_R_NO_MEMORY;
        !           142:        *physical = 0;
        !           143:     }
        !           144: 
        !           145:     return( err);
        !           146: }
        !           147: 
        !           148: IOReturn
        !           149: IOFreePhysicallyContiguousMemory( IOVirtualAddress * logical, unsigned int size)
        !           150: {
        !           151:     IOFree( logical, size);
        !           152:     return( IO_R_SUCCESS);
        !           153: }
        !           154: 
        !           155: 
        !           156: 
        !           157: 
        !           158: 

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