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
|
/******************************************************************************
*
* Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2006, R. Byron Moore
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*/
#include <acpi/acpi.h>
#define _COMPONENT ACPI_HARDWARE
ACPI_MODULE_NAME("hwacpi")
/******************************************************************************
*
* FUNCTION: acpi_hw_set_mode
*
* PARAMETERS: Mode - SYS_MODE_ACPI or SYS_MODE_LEGACY
*
* RETURN: Status
*
* DESCRIPTION: Transitions the system into the requested mode.
*
******************************************************************************/
acpi_status acpi_hw_set_mode(u32 mode)
{
acpi_status status;
u32 retry;
ACPI_FUNCTION_TRACE(hw_set_mode);
/*
* ACPI 2.0 clarified that if SMI_CMD in FADT is zero,
* system does not support mode transition.
*/
if (!acpi_gbl_FADT.smi_command) {
ACPI_ERROR((AE_INFO,
"No SMI_CMD in FADT, mode transition failed"));
return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
}
/*
* ACPI 2.0 clarified the meaning of ACPI_ENABLE and ACPI_DISABLE
* in FADT: If it is zero, enabling or disabling is not supported.
* As old systems may have used zero for mode transition,
* we make sure both the numbers are zero to determine these
* transitions are not supported.
*/
if (!acpi_gbl_FADT.acpi_enable && !acpi_gbl_FADT.acpi_disable) {
ACPI_ERROR((AE_INFO,
"No ACPI mode transition supported in this system (enable/disable both zero)"));
return_ACPI_STATUS(AE_OK);
}
switch (mode) {
case ACPI_SYS_MODE_ACPI:
/* BIOS should have disabled ALL fixed and GP events */
status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
(u32) acpi_gbl_FADT.acpi_enable, 8);
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Attempting to enable ACPI mode\n"));
break;
case ACPI_SYS_MODE_LEGACY:
/*
* BIOS should clear all fixed status bits and restore fixed event
* enable bits to default
*/
status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
(u32) acpi_gbl_FADT.acpi_disable,
8);
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Attempting to enable Legacy (non-ACPI) mode\n"));
break;
default:
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status,
"Could not write ACPI mode change"));
return_ACPI_STATUS(status);
}
/*
* Some hardware takes a LONG time to switch modes. Give them 3 sec to
* do so, but allow faster systems to proceed more quickly.
*/
retry = 3000;
while (retry) {
if (acpi_hw_get_mode() == mode) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Mode %X successfully enabled\n",
mode));
return_ACPI_STATUS(AE_OK);
}
acpi_os_stall(1000);
retry--;
}
ACPI_ERROR((AE_INFO, "Hardware did not change modes"));
return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
}
/*******************************************************************************
*
* FUNCTION: acpi_hw_get_mode
*
* PARAMETERS: none
*
* RETURN: SYS_MODE_ACPI or SYS_MODE_LEGACY
*
* DESCRIPTION: Return current operating state of system. Determined by
* querying the SCI_EN bit.
*
******************************************************************************/
u32 acpi_hw_get_mode(void)
{
acpi_status status;
u32 value;
ACPI_FUNCTION_TRACE(hw_get_mode);
/*
* ACPI 2.0 clarified that if SMI_CMD in FADT is zero,
* system does not support mode transition.
*/
if (!acpi_gbl_FADT.smi_command) {
return_UINT32(ACPI_SYS_MODE_ACPI);
}
status = acpi_get_register(ACPI_BITREG_SCI_ENABLE, &value);
if (ACPI_FAILURE(status)) {
return_UINT32(ACPI_SYS_MODE_LEGACY);
}
if (value) {
return_UINT32(ACPI_SYS_MODE_ACPI);
} else {
return_UINT32(ACPI_SYS_MODE_LEGACY);
}
}
|
