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Annotation of XNU/iokit/Kernel/ppc/IODBDMA.cpp, revision 1.1.1.1

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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