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1 | /****************************************************************************** | |
2 | * | |
3 | * Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
8 | * Copyright (C) 2000 - 2017, Intel Corp. | |
9 | * All rights reserved. | |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions | |
13 | * are met: | |
14 | * 1. Redistributions of source code must retain the above copyright | |
15 | * notice, this list of conditions, and the following disclaimer, | |
16 | * without modification. | |
17 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer | |
18 | * substantially similar to the "NO WARRANTY" disclaimer below | |
19 | * ("Disclaimer") and any redistribution must be conditioned upon | |
20 | * including a substantially similar Disclaimer requirement for further | |
21 | * binary redistribution. | |
22 | * 3. Neither the names of the above-listed copyright holders nor the names | |
23 | * of any contributors may be used to endorse or promote products derived | |
24 | * from this software without specific prior written permission. | |
25 | * | |
26 | * Alternatively, this software may be distributed under the terms of the | |
27 | * GNU General Public License ("GPL") version 2 as published by the Free | |
28 | * Software Foundation. | |
29 | * | |
30 | * NO WARRANTY | |
31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR | |
34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
35 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
36 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
37 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
39 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
40 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
41 | * POSSIBILITY OF SUCH DAMAGES. | |
42 | */ | |
43 | ||
44 | #include <acpi/acpi.h> | |
45 | #include "accommon.h" | |
46 | ||
47 | #define _COMPONENT ACPI_HARDWARE | |
48 | ACPI_MODULE_NAME("hwacpi") | |
49 | ||
50 | #if (!ACPI_REDUCED_HARDWARE) /* Entire module */ | |
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 | ******************************************************************************/ | |
62 | acpi_status acpi_hw_set_mode(u32 mode) | |
63 | { | |
64 | ||
65 | acpi_status status; | |
66 | ||
67 | ACPI_FUNCTION_TRACE(hw_set_mode); | |
68 | ||
69 | /* If the Hardware Reduced flag is set, machine is always in acpi mode */ | |
70 | ||
71 | if (acpi_gbl_reduced_hardware) { | |
72 | return_ACPI_STATUS(AE_OK); | |
73 | } | |
74 | ||
75 | /* | |
76 | * ACPI 2.0 clarified that if SMI_CMD in FADT is zero, | |
77 | * system does not support mode transition. | |
78 | */ | |
79 | if (!acpi_gbl_FADT.smi_command) { | |
80 | ACPI_ERROR((AE_INFO, | |
81 | "No SMI_CMD in FADT, mode transition failed")); | |
82 | return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE); | |
83 | } | |
84 | ||
85 | /* | |
86 | * ACPI 2.0 clarified the meaning of ACPI_ENABLE and ACPI_DISABLE | |
87 | * in FADT: If it is zero, enabling or disabling is not supported. | |
88 | * As old systems may have used zero for mode transition, | |
89 | * we make sure both the numbers are zero to determine these | |
90 | * transitions are not supported. | |
91 | */ | |
92 | if (!acpi_gbl_FADT.acpi_enable && !acpi_gbl_FADT.acpi_disable) { | |
93 | ACPI_ERROR((AE_INFO, | |
94 | "No ACPI mode transition supported in this system " | |
95 | "(enable/disable both zero)")); | |
96 | return_ACPI_STATUS(AE_OK); | |
97 | } | |
98 | ||
99 | switch (mode) { | |
100 | case ACPI_SYS_MODE_ACPI: | |
101 | ||
102 | /* BIOS should have disabled ALL fixed and GP events */ | |
103 | ||
104 | status = acpi_hw_write_port(acpi_gbl_FADT.smi_command, | |
105 | (u32) acpi_gbl_FADT.acpi_enable, 8); | |
106 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
107 | "Attempting to enable ACPI mode\n")); | |
108 | break; | |
109 | ||
110 | case ACPI_SYS_MODE_LEGACY: | |
111 | /* | |
112 | * BIOS should clear all fixed status bits and restore fixed event | |
113 | * enable bits to default | |
114 | */ | |
115 | status = acpi_hw_write_port(acpi_gbl_FADT.smi_command, | |
116 | (u32)acpi_gbl_FADT.acpi_disable, 8); | |
117 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
118 | "Attempting to enable Legacy (non-ACPI) mode\n")); | |
119 | break; | |
120 | ||
121 | default: | |
122 | ||
123 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
124 | } | |
125 | ||
126 | if (ACPI_FAILURE(status)) { | |
127 | ACPI_EXCEPTION((AE_INFO, status, | |
128 | "Could not write ACPI mode change")); | |
129 | return_ACPI_STATUS(status); | |
130 | } | |
131 | ||
132 | return_ACPI_STATUS(AE_OK); | |
133 | } | |
134 | ||
135 | /******************************************************************************* | |
136 | * | |
137 | * FUNCTION: acpi_hw_get_mode | |
138 | * | |
139 | * PARAMETERS: none | |
140 | * | |
141 | * RETURN: SYS_MODE_ACPI or SYS_MODE_LEGACY | |
142 | * | |
143 | * DESCRIPTION: Return current operating state of system. Determined by | |
144 | * querying the SCI_EN bit. | |
145 | * | |
146 | ******************************************************************************/ | |
147 | ||
148 | u32 acpi_hw_get_mode(void) | |
149 | { | |
150 | acpi_status status; | |
151 | u32 value; | |
152 | ||
153 | ACPI_FUNCTION_TRACE(hw_get_mode); | |
154 | ||
155 | /* If the Hardware Reduced flag is set, machine is always in acpi mode */ | |
156 | ||
157 | if (acpi_gbl_reduced_hardware) { | |
158 | return_UINT32(ACPI_SYS_MODE_ACPI); | |
159 | } | |
160 | ||
161 | /* | |
162 | * ACPI 2.0 clarified that if SMI_CMD in FADT is zero, | |
163 | * system does not support mode transition. | |
164 | */ | |
165 | if (!acpi_gbl_FADT.smi_command) { | |
166 | return_UINT32(ACPI_SYS_MODE_ACPI); | |
167 | } | |
168 | ||
169 | status = acpi_read_bit_register(ACPI_BITREG_SCI_ENABLE, &value); | |
170 | if (ACPI_FAILURE(status)) { | |
171 | return_UINT32(ACPI_SYS_MODE_LEGACY); | |
172 | } | |
173 | ||
174 | if (value) { | |
175 | return_UINT32(ACPI_SYS_MODE_ACPI); | |
176 | } else { | |
177 | return_UINT32(ACPI_SYS_MODE_LEGACY); | |
178 | } | |
179 | } | |
180 | ||
181 | #endif /* !ACPI_REDUCED_HARDWARE */ |