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1da177e4 LT |
1 | |
2 | /****************************************************************************** | |
3 | * | |
4 | * Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface | |
5 | * | |
6 | *****************************************************************************/ | |
7 | ||
8 | /* | |
75a44ce0 | 9 | * Copyright (C) 2000 - 2008, 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> |
50df4d8b | 46 | #include <acpi/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 BM |
88 | ACPI_ERROR((AE_INFO, |
89 | "No ACPI mode transition supported in this system (enable/disable both zero)")); | |
4be44fcd | 90 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
91 | } |
92 | ||
93 | switch (mode) { | |
94 | case ACPI_SYS_MODE_ACPI: | |
95 | ||
96 | /* BIOS should have disabled ALL fixed and GP events */ | |
97 | ||
f3d2e786 BM |
98 | status = acpi_os_write_port(acpi_gbl_FADT.smi_command, |
99 | (u32) acpi_gbl_FADT.acpi_enable, 8); | |
4be44fcd LB |
100 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
101 | "Attempting to enable ACPI mode\n")); | |
1da177e4 LT |
102 | break; |
103 | ||
104 | case ACPI_SYS_MODE_LEGACY: | |
105 | ||
106 | /* | |
107 | * BIOS should clear all fixed status bits and restore fixed event | |
108 | * enable bits to default | |
109 | */ | |
f3d2e786 BM |
110 | status = acpi_os_write_port(acpi_gbl_FADT.smi_command, |
111 | (u32) acpi_gbl_FADT.acpi_disable, | |
4be44fcd LB |
112 | 8); |
113 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
114 | "Attempting to enable Legacy (non-ACPI) mode\n")); | |
1da177e4 LT |
115 | break; |
116 | ||
117 | default: | |
4be44fcd | 118 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
119 | } |
120 | ||
4be44fcd | 121 | if (ACPI_FAILURE(status)) { |
b8e4d893 BM |
122 | ACPI_EXCEPTION((AE_INFO, status, |
123 | "Could not write ACPI mode change")); | |
4be44fcd | 124 | return_ACPI_STATUS(status); |
1da177e4 LT |
125 | } |
126 | ||
127 | /* | |
128 | * Some hardware takes a LONG time to switch modes. Give them 3 sec to | |
129 | * do so, but allow faster systems to proceed more quickly. | |
130 | */ | |
131 | retry = 3000; | |
132 | while (retry) { | |
133 | if (acpi_hw_get_mode() == mode) { | |
4be44fcd LB |
134 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
135 | "Mode %X successfully enabled\n", | |
136 | mode)); | |
137 | return_ACPI_STATUS(AE_OK); | |
1da177e4 LT |
138 | } |
139 | acpi_os_stall(1000); | |
140 | retry--; | |
141 | } | |
142 | ||
b8e4d893 | 143 | ACPI_ERROR((AE_INFO, "Hardware did not change modes")); |
4be44fcd | 144 | return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE); |
1da177e4 LT |
145 | } |
146 | ||
44f6c012 | 147 | /******************************************************************************* |
1da177e4 LT |
148 | * |
149 | * FUNCTION: acpi_hw_get_mode | |
150 | * | |
151 | * PARAMETERS: none | |
152 | * | |
153 | * RETURN: SYS_MODE_ACPI or SYS_MODE_LEGACY | |
154 | * | |
155 | * DESCRIPTION: Return current operating state of system. Determined by | |
156 | * querying the SCI_EN bit. | |
157 | * | |
158 | ******************************************************************************/ | |
159 | ||
4be44fcd | 160 | u32 acpi_hw_get_mode(void) |
1da177e4 | 161 | { |
4be44fcd LB |
162 | acpi_status status; |
163 | u32 value; | |
1da177e4 | 164 | |
b229cf92 | 165 | ACPI_FUNCTION_TRACE(hw_get_mode); |
1da177e4 LT |
166 | |
167 | /* | |
168 | * ACPI 2.0 clarified that if SMI_CMD in FADT is zero, | |
169 | * system does not support mode transition. | |
170 | */ | |
f3d2e786 | 171 | if (!acpi_gbl_FADT.smi_command) { |
50eca3eb | 172 | return_UINT32(ACPI_SYS_MODE_ACPI); |
1da177e4 LT |
173 | } |
174 | ||
d8c71b6d | 175 | status = acpi_get_register(ACPI_BITREG_SCI_ENABLE, &value); |
4be44fcd | 176 | if (ACPI_FAILURE(status)) { |
50eca3eb | 177 | return_UINT32(ACPI_SYS_MODE_LEGACY); |
1da177e4 LT |
178 | } |
179 | ||
180 | if (value) { | |
50eca3eb | 181 | return_UINT32(ACPI_SYS_MODE_ACPI); |
4be44fcd | 182 | } else { |
50eca3eb | 183 | return_UINT32(ACPI_SYS_MODE_LEGACY); |
1da177e4 LT |
184 | } |
185 | } |