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Annotation of XNU/iokit/Kernel/ppc/IODBDMA.cpp, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * Copyright (c) 1997 Apple Computer, Inc.
        !            24:  *
        !            25:  *
        !            26:  * HISTORY
        !            27:  *
        !            28:  * Simon Douglas  10 Nov 97
        !            29:  * - first checked in, mostly from machdep/ppc/dbdma.c
        !            30:  *
        !            31:  */
        !            32: 
        !            33: 
        !            34: #include <IOKit/ppc/IODBDMA.h>
        !            35: #include <IOKit/IOLib.h>
        !            36: 
        !            37: void
        !            38: IODBDMAStart( volatile IODBDMAChannelRegisters *registers, volatile IODBDMADescriptor *physicalDescPtr)
        !            39: {
        !            40: 
        !            41:     if( ((int) physicalDescPtr) & 0xf)
        !            42:        panic("IODBDMAStart: unaligned IODBDMADescriptor");
        !            43: 
        !            44:     eieio();
        !            45:     IOSetDBDMAInterruptSelect(registers, 0xff000000);          // clear out interrupts
        !            46: 
        !            47:     IOSetDBDMAChannelControl( registers,
        !            48:        IOClearDBDMAChannelControlBits( kdbdmaRun | kdbdmaPause | kdbdmaFlush | kdbdmaWake | kdbdmaDead | kdbdmaActive ));
        !            49: 
        !            50:     while( IOGetDBDMAChannelStatus( registers) & kdbdmaActive)
        !            51:        eieio();
        !            52: 
        !            53:     IOSetDBDMACommandPtr( registers, (unsigned int) physicalDescPtr);
        !            54: 
        !            55:     IOSetDBDMAChannelControl( registers,
        !            56:        IOSetDBDMAChannelControlBits( kdbdmaRun | kdbdmaWake ));
        !            57: 
        !            58: }
        !            59: 
        !            60: void
        !            61: IODBDMAStop( volatile IODBDMAChannelRegisters *registers)
        !            62: {
        !            63: 
        !            64:     IOSetDBDMAChannelControl( registers,
        !            65:          IOClearDBDMAChannelControlBits( kdbdmaRun )
        !            66:        | IOSetDBDMAChannelControlBits(  kdbdmaFlush ));
        !            67: 
        !            68:     while( IOGetDBDMAChannelStatus( registers) & ( kdbdmaActive | kdbdmaFlush))
        !            69:        eieio();
        !            70: 
        !            71: }
        !            72: 
        !            73: void
        !            74: IODBDMAFlush( volatile IODBDMAChannelRegisters *registers)
        !            75: {
        !            76: 
        !            77:     IOSetDBDMAChannelControl( registers,
        !            78:         IOSetDBDMAChannelControlBits(  kdbdmaFlush ));
        !            79: 
        !            80:     while( IOGetDBDMAChannelStatus( registers) & kdbdmaFlush)
        !            81:        eieio();
        !            82: 
        !            83: }
        !            84: 
        !            85: void
        !            86: IODBDMAReset( volatile IODBDMAChannelRegisters *registers)
        !            87: {
        !            88: 
        !            89:     IOSetDBDMAChannelControl( registers,
        !            90:        IOClearDBDMAChannelControlBits( kdbdmaRun | kdbdmaPause | kdbdmaFlush | kdbdmaWake | kdbdmaDead | kdbdmaActive ));
        !            91: 
        !            92:     while( IOGetDBDMAChannelStatus( registers) & kdbdmaActive)
        !            93:        eieio();
        !            94: 
        !            95: }
        !            96: 
        !            97: void
        !            98: IODBDMAContinue( volatile IODBDMAChannelRegisters *registers)
        !            99: {
        !           100: 
        !           101:     IOSetDBDMAChannelControl( registers,
        !           102:          IOClearDBDMAChannelControlBits( kdbdmaPause | kdbdmaDead )
        !           103:        | IOSetDBDMAChannelControlBits(  kdbdmaRun | kdbdmaWake ));
        !           104: 
        !           105: }
        !           106: 
        !           107: void
        !           108: IODBDMAPause( volatile IODBDMAChannelRegisters *registers)
        !           109: {
        !           110: 
        !           111:     IOSetDBDMAChannelControl( registers,
        !           112:         IOSetDBDMAChannelControlBits(  kdbdmaPause ));
        !           113: 
        !           114:     while( IOGetDBDMAChannelStatus( registers) & kdbdmaActive)
        !           115:        eieio();
        !           116: 
        !           117: }
        !           118: 
        !           119: IOReturn
        !           120: IOAllocatePhysicallyContiguousMemory(
        !           121:                unsigned int /* size */, unsigned int /* options */,
        !           122:                IOVirtualAddress * /* logical */,
        !           123:                IOPhysicalAddress * /* physical */ )
        !           124: {
        !           125: #if 0
        !           126:     IOReturn           err;
        !           127:     vm_offset_t                mem;
        !           128: 
        !           129:     if( (size > 4096) || (options))
        !           130:        return( kIOReturnUnsupported);
        !           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 = kIOReturnNoMemory;
        !           142:        *physical = 0;
        !           143:     }
        !           144: 
        !           145:     return( err);
        !           146: #endif /* 0 */
        !           147:        return (kIOReturnUnsupported);
        !           148: }
        !           149: 
        !           150: IOReturn
        !           151: IOFreePhysicallyContiguousMemory( IOVirtualAddress * logical, unsigned int size)
        !           152: {
        !           153:     IOFree( logical, size);
        !           154:     return( kIOReturnSuccess);
        !           155: }

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