]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | |
2 | /****************************************************************************** | |
3 | * | |
4 | * Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface | |
5 | * | |
6 | *****************************************************************************/ | |
7 | ||
8 | /* | |
9 | * Copyright (C) 2000 - 2005, R. Byron Moore | |
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 LT |
45 | #include <acpi/acpi.h> |
46 | ||
1da177e4 | 47 | #define _COMPONENT ACPI_HARDWARE |
4be44fcd | 48 | ACPI_MODULE_NAME("hwacpi") |
1da177e4 LT |
49 | |
50 | /****************************************************************************** | |
51 | * | |
52 | * FUNCTION: acpi_hw_initialize | |
53 | * | |
54 | * PARAMETERS: None | |
55 | * | |
56 | * RETURN: Status | |
57 | * | |
44f6c012 RM |
58 | * DESCRIPTION: Initialize and validate the various ACPI registers defined in |
59 | * the FADT. | |
1da177e4 LT |
60 | * |
61 | ******************************************************************************/ | |
4be44fcd | 62 | acpi_status acpi_hw_initialize(void) |
1da177e4 | 63 | { |
4be44fcd | 64 | acpi_status status; |
1da177e4 | 65 | |
4be44fcd | 66 | ACPI_FUNCTION_TRACE("hw_initialize"); |
1da177e4 LT |
67 | |
68 | /* We must have the ACPI tables by the time we get here */ | |
69 | ||
70 | if (!acpi_gbl_FADT) { | |
4be44fcd | 71 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "No FADT is present\n")); |
1da177e4 | 72 | |
4be44fcd | 73 | return_ACPI_STATUS(AE_NO_ACPI_TABLES); |
1da177e4 LT |
74 | } |
75 | ||
76 | /* Sanity check the FADT for valid values */ | |
77 | ||
4be44fcd LB |
78 | status = acpi_ut_validate_fadt(); |
79 | if (ACPI_FAILURE(status)) { | |
80 | return_ACPI_STATUS(status); | |
1da177e4 LT |
81 | } |
82 | ||
4be44fcd | 83 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
84 | } |
85 | ||
1da177e4 LT |
86 | /****************************************************************************** |
87 | * | |
88 | * FUNCTION: acpi_hw_set_mode | |
89 | * | |
90 | * PARAMETERS: Mode - SYS_MODE_ACPI or SYS_MODE_LEGACY | |
91 | * | |
92 | * RETURN: Status | |
93 | * | |
94 | * DESCRIPTION: Transitions the system into the requested mode. | |
95 | * | |
96 | ******************************************************************************/ | |
97 | ||
4be44fcd | 98 | acpi_status acpi_hw_set_mode(u32 mode) |
1da177e4 LT |
99 | { |
100 | ||
4be44fcd LB |
101 | acpi_status status; |
102 | u32 retry; | |
1da177e4 | 103 | |
4be44fcd | 104 | ACPI_FUNCTION_TRACE("hw_set_mode"); |
1da177e4 LT |
105 | |
106 | /* | |
107 | * ACPI 2.0 clarified that if SMI_CMD in FADT is zero, | |
108 | * system does not support mode transition. | |
109 | */ | |
110 | if (!acpi_gbl_FADT->smi_cmd) { | |
4be44fcd LB |
111 | ACPI_REPORT_ERROR(("No SMI_CMD in FADT, mode transition failed.\n")); |
112 | return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE); | |
1da177e4 LT |
113 | } |
114 | ||
115 | /* | |
116 | * ACPI 2.0 clarified the meaning of ACPI_ENABLE and ACPI_DISABLE | |
117 | * in FADT: If it is zero, enabling or disabling is not supported. | |
118 | * As old systems may have used zero for mode transition, | |
119 | * we make sure both the numbers are zero to determine these | |
120 | * transitions are not supported. | |
121 | */ | |
122 | if (!acpi_gbl_FADT->acpi_enable && !acpi_gbl_FADT->acpi_disable) { | |
4be44fcd LB |
123 | ACPI_REPORT_ERROR(("No ACPI mode transition supported in this system (enable/disable both zero)\n")); |
124 | return_ACPI_STATUS(AE_OK); | |
1da177e4 LT |
125 | } |
126 | ||
127 | switch (mode) { | |
128 | case ACPI_SYS_MODE_ACPI: | |
129 | ||
130 | /* BIOS should have disabled ALL fixed and GP events */ | |
131 | ||
4be44fcd LB |
132 | status = acpi_os_write_port(acpi_gbl_FADT->smi_cmd, |
133 | (u32) acpi_gbl_FADT->acpi_enable, | |
134 | 8); | |
135 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
136 | "Attempting to enable ACPI mode\n")); | |
1da177e4 LT |
137 | break; |
138 | ||
139 | case ACPI_SYS_MODE_LEGACY: | |
140 | ||
141 | /* | |
142 | * BIOS should clear all fixed status bits and restore fixed event | |
143 | * enable bits to default | |
144 | */ | |
4be44fcd LB |
145 | status = acpi_os_write_port(acpi_gbl_FADT->smi_cmd, |
146 | (u32) acpi_gbl_FADT->acpi_disable, | |
147 | 8); | |
148 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
149 | "Attempting to enable Legacy (non-ACPI) mode\n")); | |
1da177e4 LT |
150 | break; |
151 | ||
152 | default: | |
4be44fcd | 153 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
154 | } |
155 | ||
4be44fcd LB |
156 | if (ACPI_FAILURE(status)) { |
157 | ACPI_REPORT_ERROR(("Could not write mode change, %s\n", | |
158 | acpi_format_exception(status))); | |
159 | return_ACPI_STATUS(status); | |
1da177e4 LT |
160 | } |
161 | ||
162 | /* | |
163 | * Some hardware takes a LONG time to switch modes. Give them 3 sec to | |
164 | * do so, but allow faster systems to proceed more quickly. | |
165 | */ | |
166 | retry = 3000; | |
167 | while (retry) { | |
168 | if (acpi_hw_get_mode() == mode) { | |
4be44fcd LB |
169 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
170 | "Mode %X successfully enabled\n", | |
171 | mode)); | |
172 | return_ACPI_STATUS(AE_OK); | |
1da177e4 LT |
173 | } |
174 | acpi_os_stall(1000); | |
175 | retry--; | |
176 | } | |
177 | ||
4be44fcd LB |
178 | ACPI_REPORT_ERROR(("Hardware never changed modes\n")); |
179 | return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE); | |
1da177e4 LT |
180 | } |
181 | ||
44f6c012 | 182 | /******************************************************************************* |
1da177e4 LT |
183 | * |
184 | * FUNCTION: acpi_hw_get_mode | |
185 | * | |
186 | * PARAMETERS: none | |
187 | * | |
188 | * RETURN: SYS_MODE_ACPI or SYS_MODE_LEGACY | |
189 | * | |
190 | * DESCRIPTION: Return current operating state of system. Determined by | |
191 | * querying the SCI_EN bit. | |
192 | * | |
193 | ******************************************************************************/ | |
194 | ||
4be44fcd | 195 | u32 acpi_hw_get_mode(void) |
1da177e4 | 196 | { |
4be44fcd LB |
197 | acpi_status status; |
198 | u32 value; | |
1da177e4 | 199 | |
4be44fcd | 200 | ACPI_FUNCTION_TRACE("hw_get_mode"); |
1da177e4 LT |
201 | |
202 | /* | |
203 | * ACPI 2.0 clarified that if SMI_CMD in FADT is zero, | |
204 | * system does not support mode transition. | |
205 | */ | |
206 | if (!acpi_gbl_FADT->smi_cmd) { | |
4be44fcd | 207 | return_VALUE(ACPI_SYS_MODE_ACPI); |
1da177e4 LT |
208 | } |
209 | ||
4be44fcd LB |
210 | status = |
211 | acpi_get_register(ACPI_BITREG_SCI_ENABLE, &value, ACPI_MTX_LOCK); | |
212 | if (ACPI_FAILURE(status)) { | |
213 | return_VALUE(ACPI_SYS_MODE_LEGACY); | |
1da177e4 LT |
214 | } |
215 | ||
216 | if (value) { | |
4be44fcd LB |
217 | return_VALUE(ACPI_SYS_MODE_ACPI); |
218 | } else { | |
219 | return_VALUE(ACPI_SYS_MODE_LEGACY); | |
1da177e4 LT |
220 | } |
221 | } |