iokit/Kernel/ppc/IODBDMA.cpp

   1 /*
   2  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * Copyright (c) 1997 Apple Computer, Inc.
  30  *
  31  *
  32  * HISTORY
  33  *
  34  * Simon Douglas  10 Nov 97
  35  * - first checked in, mostly from machdep/ppc/dbdma.c
  36  *
  37  */
  38
  39
  40 #include <IOKit/ppc/IODBDMA.h>
  41 #include <IOKit/IOLib.h>
  42
  43 void
  44 IODBDMAStart( volatile IODBDMAChannelRegisters *registers, volatile IODBDMADescriptor *physicalDescPtr)
  45 {
  46
  47     if( ((int) physicalDescPtr) & 0xf)
  48         panic("IODBDMAStart: unaligned IODBDMADescriptor");
  49
  50     eieio();
  51     IOSetDBDMAInterruptSelect(registers, 0xff000000);           // clear out interrupts
  52
  53     IOSetDBDMAChannelControl( registers,
  54         IOClearDBDMAChannelControlBits( kdbdmaRun | kdbdmaPause | kdbdmaFlush | kdbdmaWake | kdbdmaDead | kdbdmaActive ));
  55
  56     while( IOGetDBDMAChannelStatus( registers) & kdbdmaActive)
  57         eieio();
  58
  59     IOSetDBDMACommandPtr( registers, (unsigned int) physicalDescPtr);
  60
  61     IOSetDBDMAChannelControl( registers,
  62         IOSetDBDMAChannelControlBits( kdbdmaRun | kdbdmaWake ));
  63
  64 }
  65
  66 void
  67 IODBDMAStop( volatile IODBDMAChannelRegisters *registers)
  68 {
  69
  70     IOSetDBDMAChannelControl( registers,
  71           IOClearDBDMAChannelControlBits( kdbdmaRun )
  72         | IOSetDBDMAChannelControlBits(  kdbdmaFlush ));
  73
  74     while( IOGetDBDMAChannelStatus( registers) & ( kdbdmaActive | kdbdmaFlush))
  75         eieio();
  76
  77 }
  78
  79 void
  80 IODBDMAFlush( volatile IODBDMAChannelRegisters *registers)
  81 {
  82
  83     IOSetDBDMAChannelControl( registers,
  84          IOSetDBDMAChannelControlBits(  kdbdmaFlush ));
  85
  86     while( IOGetDBDMAChannelStatus( registers) & kdbdmaFlush)
  87         eieio();
  88
  89 }
  90
  91 void
  92 IODBDMAReset( volatile IODBDMAChannelRegisters *registers)
  93 {
  94
  95     IOSetDBDMAChannelControl( registers,
  96         IOClearDBDMAChannelControlBits( kdbdmaRun | kdbdmaPause | kdbdmaFlush | kdbdmaWake | kdbdmaDead | kdbdmaActive ));
  97
  98     while( IOGetDBDMAChannelStatus( registers) & kdbdmaActive)
  99         eieio();
 100
 101 }
 102
 103 void
 104 IODBDMAContinue( volatile IODBDMAChannelRegisters *registers)
 105 {
 106
 107     IOSetDBDMAChannelControl( registers,
 108           IOClearDBDMAChannelControlBits( kdbdmaPause | kdbdmaDead )
 109         | IOSetDBDMAChannelControlBits(  kdbdmaRun | kdbdmaWake ));
 110
 111 }
 112
 113 void
 114 IODBDMAPause( volatile IODBDMAChannelRegisters *registers)
 115 {
 116
 117     IOSetDBDMAChannelControl( registers,
 118          IOSetDBDMAChannelControlBits(  kdbdmaPause ));
 119
 120     while( IOGetDBDMAChannelStatus( registers) & kdbdmaActive)
 121         eieio();
 122
 123 }
 124
 125 IOReturn
 126 IOAllocatePhysicallyContiguousMemory(
 127                 unsigned int /* size */, unsigned int /* options */,
 128                 IOVirtualAddress * /* logical */,
 129                 IOPhysicalAddress * /* physical */ )
 130 {
 131 #if 0
 132     IOReturn            err;
 133     vm_offset_t         mem;
 134
 135     if( (size > 4096) || (options))
 136         return( kIOReturnUnsupported);
 137
 138     mem = (vm_offset_t) IOMalloc( size);
 139     *logical = (IOVirtualAddress) mem;
 140
 141     if( mem) {
 142         err = IOPhysicalFromVirtual( IOVmTaskSelf(), mem, (vm_offset_t *) physical);
 143         if( err)
 144             IOFree( (char *)mem, size);
 145
 146     } else {
 147         err = kIOReturnNoMemory;
 148         *physical = 0;
 149     }
 150
 151     return( err);
 152 #endif /* 0 */
 153         return (kIOReturnUnsupported);
 154 }
 155
 156 IOReturn
 157 IOFreePhysicallyContiguousMemory( IOVirtualAddress * logical, unsigned int size)
 158 {
 159     IOFree( logical, size);
 160     return( kIOReturnSuccess);
 161 }