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  * 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 }