1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
/*++
Copyright (c) 2006, Intel Corporation
All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
Module Name:
PciCommand.c
Abstract:
PCI Bus Driver
Revision History
--*/
#include "pcibus.h"
EFI_STATUS
PciOperateRegister (
IN PCI_IO_DEVICE *PciIoDevice,
IN UINT16 Command,
IN UINT8 Offset,
IN UINT8 Operation,
OUT UINT16 *PtrCommand
)
/*++
Routine Description:
Arguments:
Returns:
None
--*/
// TODO: PciIoDevice - add argument and description to function comment
// TODO: Command - add argument and description to function comment
// TODO: Offset - add argument and description to function comment
// TODO: Operation - add argument and description to function comment
// TODO: PtrCommand - add argument and description to function comment
{
UINT16 OldCommand;
EFI_STATUS Status;
EFI_PCI_IO_PROTOCOL *PciIo;
OldCommand = 0;
PciIo = &PciIoDevice->PciIo;
if (Operation != EFI_SET_REGISTER) {
Status = PciIo->Pci.Read (
PciIo,
EfiPciIoWidthUint16,
Offset,
1,
&OldCommand
);
if (Operation == EFI_GET_REGISTER) {
*PtrCommand = OldCommand;
return Status;
}
}
if (Operation == EFI_ENABLE_REGISTER) {
OldCommand = (UINT16) (OldCommand | Command);
} else if (Operation == EFI_DISABLE_REGISTER) {
OldCommand = (UINT16) (OldCommand & ~(Command));
} else {
OldCommand = Command;
}
return PciIo->Pci.Write (
PciIo,
EfiPciIoWidthUint16,
Offset,
1,
&OldCommand
);
}
BOOLEAN
PciCapabilitySupport (
IN PCI_IO_DEVICE *PciIoDevice
)
/*++
Routine Description:
Arguments:
Returns:
None
--*/
// TODO: PciIoDevice - add argument and description to function comment
{
if (PciIoDevice->Pci.Hdr.Status & EFI_PCI_STATUS_CAPABILITY) {
return TRUE;
}
return FALSE;
}
EFI_STATUS
LocateCapabilityRegBlock (
IN PCI_IO_DEVICE *PciIoDevice,
IN UINT8 CapId,
IN OUT UINT8 *Offset,
OUT UINT8 *NextRegBlock OPTIONAL
)
/*++
Routine Description:
Locate cap reg.
Arguments:
PciIoDevice - A pointer to the PCI_IO_DEVICE.
CapId - The cap ID.
Offset - A pointer to the offset.
NextRegBlock - A pointer to the next block.
Returns:
None
--*/
// TODO: EFI_UNSUPPORTED - add return value to function comment
// TODO: EFI_SUCCESS - add return value to function comment
// TODO: EFI_NOT_FOUND - add return value to function comment
{
UINT8 CapabilityPtr;
UINT16 CapabilityEntry;
UINT8 CapabilityID;
//
// To check the cpability of this device supports
//
if (!PciCapabilitySupport (PciIoDevice)) {
return EFI_UNSUPPORTED;
}
if (*Offset != 0) {
CapabilityPtr = *Offset;
} else {
CapabilityPtr = 0;
if (IS_CARDBUS_BRIDGE (&PciIoDevice->Pci)) {
PciIoDevice->PciIo.Pci.Read (
&PciIoDevice->PciIo,
EfiPciIoWidthUint8,
EFI_PCI_CARDBUS_BRIDGE_CAPABILITY_PTR,
1,
&CapabilityPtr
);
} else {
PciIoDevice->PciIo.Pci.Read (
&PciIoDevice->PciIo,
EfiPciIoWidthUint8,
EFI_PCI_CAPABILITY_PTR,
1,
&CapabilityPtr
);
}
}
while (CapabilityPtr > 0x3F) {
//
// Mask it to DWORD alignment per PCI spec
//
CapabilityPtr &= 0xFC;
PciIoDevice->PciIo.Pci.Read (
&PciIoDevice->PciIo,
EfiPciIoWidthUint16,
CapabilityPtr,
1,
&CapabilityEntry
);
CapabilityID = (UINT8) CapabilityEntry;
if (CapabilityID == CapId) {
*Offset = CapabilityPtr;
if (NextRegBlock != NULL) {
*NextRegBlock = (UINT8) (CapabilityEntry >> 8);
}
return EFI_SUCCESS;
}
CapabilityPtr = (UINT8) (CapabilityEntry >> 8);
}
return EFI_NOT_FOUND;
}
|
