iokit/Kernel/ppc/IODBDMA.cpp

   1 /*
   2  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1997 Apple Computer, Inc.
  27  *
  28  *
  29  * HISTORY
  30  *
  31  * Simon Douglas  10 Nov 97
  32  * - first checked in, mostly from machdep/ppc/dbdma.c
  33  *
  34  */
  35
  36
  37 #include <IOKit/ppc/IODBDMA.h>
  38 #include <IOKit/IOLib.h>
  39
  40 void
  41 IODBDMAStart( volatile IODBDMAChannelRegisters *registers, volatile IODBDMADescriptor *physicalDescPtr)
  42 {
  43
  44     if( ((int) physicalDescPtr) & 0xf)
  45         panic("IODBDMAStart: unaligned IODBDMADescriptor");
  46
  47     eieio();
  48     IOSetDBDMAInterruptSelect(registers, 0xff000000);           // clear out interrupts
  49
  50     IOSetDBDMAChannelControl( registers,
  51         IOClearDBDMAChannelControlBits( kdbdmaRun | kdbdmaPause | kdbdmaFlush | kdbdmaWake | kdbdmaDead | kdbdmaActive ));
  52
  53     while( IOGetDBDMAChannelStatus( registers) & kdbdmaActive)
  54         eieio();
  55
  56     IOSetDBDMACommandPtr( registers, (unsigned int) physicalDescPtr);
  57
  58     IOSetDBDMAChannelControl( registers,
  59         IOSetDBDMAChannelControlBits( kdbdmaRun | kdbdmaWake ));
  60
  61 }
  62
  63 void
  64 IODBDMAStop( volatile IODBDMAChannelRegisters *registers)
  65 {
  66
  67     IOSetDBDMAChannelControl( registers,
  68           IOClearDBDMAChannelControlBits( kdbdmaRun )
  69         | IOSetDBDMAChannelControlBits(  kdbdmaFlush ));
  70
  71     while( IOGetDBDMAChannelStatus( registers) & ( kdbdmaActive | kdbdmaFlush))
  72         eieio();
  73
  74 }
  75
  76 void
  77 IODBDMAFlush( volatile IODBDMAChannelRegisters *registers)
  78 {
  79
  80     IOSetDBDMAChannelControl( registers,
  81          IOSetDBDMAChannelControlBits(  kdbdmaFlush ));
  82
  83     while( IOGetDBDMAChannelStatus( registers) & kdbdmaFlush)
  84         eieio();
  85
  86 }
  87
  88 void
  89 IODBDMAReset( volatile IODBDMAChannelRegisters *registers)
  90 {
  91
  92     IOSetDBDMAChannelControl( registers,
  93         IOClearDBDMAChannelControlBits( kdbdmaRun | kdbdmaPause | kdbdmaFlush | kdbdmaWake | kdbdmaDead | kdbdmaActive ));
  94
  95     while( IOGetDBDMAChannelStatus( registers) & kdbdmaActive)
  96         eieio();
  97
  98 }
  99
 100 void
 101 IODBDMAContinue( volatile IODBDMAChannelRegisters *registers)
 102 {
 103
 104     IOSetDBDMAChannelControl( registers,
 105           IOClearDBDMAChannelControlBits( kdbdmaPause | kdbdmaDead )
 106         | IOSetDBDMAChannelControlBits(  kdbdmaRun | kdbdmaWake ));
 107
 108 }
 109
 110 void
 111 IODBDMAPause( volatile IODBDMAChannelRegisters *registers)
 112 {
 113
 114     IOSetDBDMAChannelControl( registers,
 115          IOSetDBDMAChannelControlBits(  kdbdmaPause ));
 116
 117     while( IOGetDBDMAChannelStatus( registers) & kdbdmaActive)
 118         eieio();
 119
 120 }
 121
 122 IOReturn
 123 IOAllocatePhysicallyContiguousMemory(
 124                 unsigned int /* size */, unsigned int /* options */,
 125                 IOVirtualAddress * /* logical */,
 126                 IOPhysicalAddress * /* physical */ )
 127 {
 128 #if 0
 129     IOReturn            err;
 130     vm_offset_t         mem;
 131
 132     if( (size > 4096) || (options))
 133         return( kIOReturnUnsupported);
 134
 135     mem = (vm_offset_t) IOMalloc( size);
 136     *logical = (IOVirtualAddress) mem;
 137
 138     if( mem) {
 139         err = IOPhysicalFromVirtual( IOVmTaskSelf(), mem, (vm_offset_t *) physical);
 140         if( err)
 141             IOFree( (char *)mem, size);
 142
 143     } else {
 144         err = kIOReturnNoMemory;
 145         *physical = 0;
 146     }
 147
 148     return( err);
 149 #endif /* 0 */
 150         return (kIOReturnUnsupported);
 151 }
 152
 153 IOReturn
 154 IOFreePhysicallyContiguousMemory( IOVirtualAddress * logical, unsigned int size)
 155 {
 156     IOFree( logical, size);
 157     return( kIOReturnSuccess);
 158 }