Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | |
2 | /****************************************************************************** | |
3 | * | |
4 | * Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface | |
5 | * | |
6 | *****************************************************************************/ | |
7 | ||
8 | /* | |
a8357b0c | 9 | * Copyright (C) 2000 - 2010, Intel Corp. |
1da177e4 LT |
10 | * All rights reserved. |
11 | * | |
12 | * Redistribution and use in source and binary forms, with or without | |
13 | * modification, are permitted provided that the following conditions | |
14 | * are met: | |
15 | * 1. Redistributions of source code must retain the above copyright | |
16 | * notice, this list of conditions, and the following disclaimer, | |
17 | * without modification. | |
18 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer | |
19 | * substantially similar to the "NO WARRANTY" disclaimer below | |
20 | * ("Disclaimer") and any redistribution must be conditioned upon | |
21 | * including a substantially similar Disclaimer requirement for further | |
22 | * binary redistribution. | |
23 | * 3. Neither the names of the above-listed copyright holders nor the names | |
24 | * of any contributors may be used to endorse or promote products derived | |
25 | * from this software without specific prior written permission. | |
26 | * | |
27 | * Alternatively, this software may be distributed under the terms of the | |
28 | * GNU General Public License ("GPL") version 2 as published by the Free | |
29 | * Software Foundation. | |
30 | * | |
31 | * NO WARRANTY | |
32 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
33 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
34 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR | |
35 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
36 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
37 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
38 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
39 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
40 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
41 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
42 | * POSSIBILITY OF SUCH DAMAGES. | |
43 | */ | |
44 | ||
1da177e4 | 45 | #include <acpi/acpi.h> |
e2f7a777 | 46 | #include "accommon.h" |
1da177e4 | 47 | |
1da177e4 | 48 | #define _COMPONENT ACPI_HARDWARE |
4be44fcd | 49 | ACPI_MODULE_NAME("hwacpi") |
1da177e4 | 50 | |
1da177e4 LT |
51 | /****************************************************************************** |
52 | * | |
53 | * FUNCTION: acpi_hw_set_mode | |
54 | * | |
55 | * PARAMETERS: Mode - SYS_MODE_ACPI or SYS_MODE_LEGACY | |
56 | * | |
57 | * RETURN: Status | |
58 | * | |
59 | * DESCRIPTION: Transitions the system into the requested mode. | |
60 | * | |
61 | ******************************************************************************/ | |
4be44fcd | 62 | acpi_status acpi_hw_set_mode(u32 mode) |
1da177e4 LT |
63 | { |
64 | ||
4be44fcd LB |
65 | acpi_status status; |
66 | u32 retry; | |
1da177e4 | 67 | |
b229cf92 | 68 | ACPI_FUNCTION_TRACE(hw_set_mode); |
1da177e4 LT |
69 | |
70 | /* | |
71 | * ACPI 2.0 clarified that if SMI_CMD in FADT is zero, | |
72 | * system does not support mode transition. | |
73 | */ | |
f3d2e786 | 74 | if (!acpi_gbl_FADT.smi_command) { |
b8e4d893 BM |
75 | ACPI_ERROR((AE_INFO, |
76 | "No SMI_CMD in FADT, mode transition failed")); | |
4be44fcd | 77 | return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE); |
1da177e4 LT |
78 | } |
79 | ||
80 | /* | |
81 | * ACPI 2.0 clarified the meaning of ACPI_ENABLE and ACPI_DISABLE | |
82 | * in FADT: If it is zero, enabling or disabling is not supported. | |
83 | * As old systems may have used zero for mode transition, | |
84 | * we make sure both the numbers are zero to determine these | |
85 | * transitions are not supported. | |
86 | */ | |
f3d2e786 | 87 | if (!acpi_gbl_FADT.acpi_enable && !acpi_gbl_FADT.acpi_disable) { |
b8e4d893 | 88 | ACPI_ERROR((AE_INFO, |
d4913dc6 BM |
89 | "No ACPI mode transition supported in this system " |
90 | "(enable/disable both zero)")); | |
4be44fcd | 91 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
92 | } |
93 | ||
94 | switch (mode) { | |
95 | case ACPI_SYS_MODE_ACPI: | |
96 | ||
97 | /* BIOS should have disabled ALL fixed and GP events */ | |
98 | ||
7f071903 | 99 | status = acpi_hw_write_port(acpi_gbl_FADT.smi_command, |
f3d2e786 | 100 | (u32) acpi_gbl_FADT.acpi_enable, 8); |
4be44fcd LB |
101 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
102 | "Attempting to enable ACPI mode\n")); | |
1da177e4 LT |
103 | break; |
104 | ||
105 | case ACPI_SYS_MODE_LEGACY: | |
106 | ||
107 | /* | |
108 | * BIOS should clear all fixed status bits and restore fixed event | |
109 | * enable bits to default | |
110 | */ | |
7f071903 | 111 | status = acpi_hw_write_port(acpi_gbl_FADT.smi_command, |
f3d2e786 | 112 | (u32) acpi_gbl_FADT.acpi_disable, |
4be44fcd LB |
113 | 8); |
114 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
115 | "Attempting to enable Legacy (non-ACPI) mode\n")); | |
1da177e4 LT |
116 | break; |
117 | ||
118 | default: | |
4be44fcd | 119 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
120 | } |
121 | ||
4be44fcd | 122 | if (ACPI_FAILURE(status)) { |
b8e4d893 BM |
123 | ACPI_EXCEPTION((AE_INFO, status, |
124 | "Could not write ACPI mode change")); | |
4be44fcd | 125 | return_ACPI_STATUS(status); |
1da177e4 LT |
126 | } |
127 | ||
128 | /* | |
129 | * Some hardware takes a LONG time to switch modes. Give them 3 sec to | |
130 | * do so, but allow faster systems to proceed more quickly. | |
131 | */ | |
132 | retry = 3000; | |
133 | while (retry) { | |
134 | if (acpi_hw_get_mode() == mode) { | |
4be44fcd LB |
135 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
136 | "Mode %X successfully enabled\n", | |
137 | mode)); | |
138 | return_ACPI_STATUS(AE_OK); | |
1da177e4 LT |
139 | } |
140 | acpi_os_stall(1000); | |
141 | retry--; | |
142 | } | |
143 | ||
b8e4d893 | 144 | ACPI_ERROR((AE_INFO, "Hardware did not change modes")); |
4be44fcd | 145 | return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE); |
1da177e4 LT |
146 | } |
147 | ||
44f6c012 | 148 | /******************************************************************************* |
1da177e4 LT |
149 | * |
150 | * FUNCTION: acpi_hw_get_mode | |
151 | * | |
152 | * PARAMETERS: none | |
153 | * | |
154 | * RETURN: SYS_MODE_ACPI or SYS_MODE_LEGACY | |
155 | * | |
156 | * DESCRIPTION: Return current operating state of system. Determined by | |
157 | * querying the SCI_EN bit. | |
158 | * | |
159 | ******************************************************************************/ | |
160 | ||
4be44fcd | 161 | u32 acpi_hw_get_mode(void) |
1da177e4 | 162 | { |
4be44fcd LB |
163 | acpi_status status; |
164 | u32 value; | |
1da177e4 | 165 | |
b229cf92 | 166 | ACPI_FUNCTION_TRACE(hw_get_mode); |
1da177e4 LT |
167 | |
168 | /* | |
169 | * ACPI 2.0 clarified that if SMI_CMD in FADT is zero, | |
170 | * system does not support mode transition. | |
171 | */ | |
f3d2e786 | 172 | if (!acpi_gbl_FADT.smi_command) { |
50eca3eb | 173 | return_UINT32(ACPI_SYS_MODE_ACPI); |
1da177e4 LT |
174 | } |
175 | ||
50ffba1b | 176 | status = acpi_read_bit_register(ACPI_BITREG_SCI_ENABLE, &value); |
4be44fcd | 177 | if (ACPI_FAILURE(status)) { |
50eca3eb | 178 | return_UINT32(ACPI_SYS_MODE_LEGACY); |
1da177e4 LT |
179 | } |
180 | ||
181 | if (value) { | |
50eca3eb | 182 | return_UINT32(ACPI_SYS_MODE_ACPI); |
4be44fcd | 183 | } else { |
50eca3eb | 184 | return_UINT32(ACPI_SYS_MODE_LEGACY); |
1da177e4 LT |
185 | } |
186 | } |