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
43void
44IODBDMAStart( 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
66void
67IODBDMAStop( 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
79void
80IODBDMAFlush( volatile IODBDMAChannelRegisters *registers)
81{
82
83    IOSetDBDMAChannelControl( registers,
84	 IOSetDBDMAChannelControlBits(  kdbdmaFlush ));
85
86    while( IOGetDBDMAChannelStatus( registers) & kdbdmaFlush)
87	eieio();
88
89}
90
91void
92IODBDMAReset( 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
103void
104IODBDMAContinue( volatile IODBDMAChannelRegisters *registers)
105{
106
107    IOSetDBDMAChannelControl( registers,
108	  IOClearDBDMAChannelControlBits( kdbdmaPause | kdbdmaDead )
109	| IOSetDBDMAChannelControlBits(  kdbdmaRun | kdbdmaWake ));
110
111}
112
113void
114IODBDMAPause( volatile IODBDMAChannelRegisters *registers)
115{
116
117    IOSetDBDMAChannelControl( registers,
118	 IOSetDBDMAChannelControlBits(  kdbdmaPause ));
119
120    while( IOGetDBDMAChannelStatus( registers) & kdbdmaActive)
121	eieio();
122
123}
124
125IOReturn
126IOAllocatePhysicallyContiguousMemory(
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
156IOReturn
157IOFreePhysicallyContiguousMemory( IOVirtualAddress * logical, unsigned int size)
158{
159    IOFree( logical, size);
160    return( kIOReturnSuccess);
161}
162