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1/******************************************************************************
2 *
3 * Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2016, 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
48ACPI_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 ******************************************************************************/
62acpi_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
148u32 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 */
1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2/******************************************************************************
3 *
4 * Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface
5 *
6 * Copyright (C) 2000 - 2023, Intel Corp.
7 *
8 *****************************************************************************/
9
10#include <acpi/acpi.h>
11#include "accommon.h"
12
13#define _COMPONENT ACPI_HARDWARE
14ACPI_MODULE_NAME("hwacpi")
15
16#if (!ACPI_REDUCED_HARDWARE) /* Entire module */
17/******************************************************************************
18 *
19 * FUNCTION: acpi_hw_set_mode
20 *
21 * PARAMETERS: mode - SYS_MODE_ACPI or SYS_MODE_LEGACY
22 *
23 * RETURN: Status
24 *
25 * DESCRIPTION: Transitions the system into the requested mode.
26 *
27 ******************************************************************************/
28acpi_status acpi_hw_set_mode(u32 mode)
29{
30
31 acpi_status status;
32
33 ACPI_FUNCTION_TRACE(hw_set_mode);
34
35 /* If the Hardware Reduced flag is set, machine is always in acpi mode */
36
37 if (acpi_gbl_reduced_hardware) {
38 return_ACPI_STATUS(AE_OK);
39 }
40
41 /*
42 * ACPI 2.0 clarified that if SMI_CMD in FADT is zero,
43 * system does not support mode transition.
44 */
45 if (!acpi_gbl_FADT.smi_command) {
46 ACPI_ERROR((AE_INFO,
47 "No SMI_CMD in FADT, mode transition failed"));
48 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
49 }
50
51 /*
52 * ACPI 2.0 clarified the meaning of ACPI_ENABLE and ACPI_DISABLE
53 * in FADT: If it is zero, enabling or disabling is not supported.
54 * As old systems may have used zero for mode transition,
55 * we make sure both the numbers are zero to determine these
56 * transitions are not supported.
57 */
58 if (!acpi_gbl_FADT.acpi_enable && !acpi_gbl_FADT.acpi_disable) {
59 ACPI_ERROR((AE_INFO,
60 "No ACPI mode transition supported in this system "
61 "(enable/disable both zero)"));
62 return_ACPI_STATUS(AE_OK);
63 }
64
65 switch (mode) {
66 case ACPI_SYS_MODE_ACPI:
67
68 /* BIOS should have disabled ALL fixed and GP events */
69
70 status = acpi_hw_write_port(acpi_gbl_FADT.smi_command,
71 (u32) acpi_gbl_FADT.acpi_enable, 8);
72 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
73 "Attempting to enable ACPI mode\n"));
74 break;
75
76 case ACPI_SYS_MODE_LEGACY:
77 /*
78 * BIOS should clear all fixed status bits and restore fixed event
79 * enable bits to default
80 */
81 status = acpi_hw_write_port(acpi_gbl_FADT.smi_command,
82 (u32)acpi_gbl_FADT.acpi_disable, 8);
83 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
84 "Attempting to enable Legacy (non-ACPI) mode\n"));
85 break;
86
87 default:
88
89 return_ACPI_STATUS(AE_BAD_PARAMETER);
90 }
91
92 if (ACPI_FAILURE(status)) {
93 ACPI_EXCEPTION((AE_INFO, status,
94 "Could not write ACPI mode change"));
95 return_ACPI_STATUS(status);
96 }
97
98 return_ACPI_STATUS(AE_OK);
99}
100
101/*******************************************************************************
102 *
103 * FUNCTION: acpi_hw_get_mode
104 *
105 * PARAMETERS: none
106 *
107 * RETURN: SYS_MODE_ACPI or SYS_MODE_LEGACY
108 *
109 * DESCRIPTION: Return current operating state of system. Determined by
110 * querying the SCI_EN bit.
111 *
112 ******************************************************************************/
113
114u32 acpi_hw_get_mode(void)
115{
116 acpi_status status;
117 u32 value;
118
119 ACPI_FUNCTION_TRACE(hw_get_mode);
120
121 /* If the Hardware Reduced flag is set, machine is always in acpi mode */
122
123 if (acpi_gbl_reduced_hardware) {
124 return_UINT32(ACPI_SYS_MODE_ACPI);
125 }
126
127 /*
128 * ACPI 2.0 clarified that if SMI_CMD in FADT is zero,
129 * system does not support mode transition.
130 */
131 if (!acpi_gbl_FADT.smi_command) {
132 return_UINT32(ACPI_SYS_MODE_ACPI);
133 }
134
135 status = acpi_read_bit_register(ACPI_BITREG_SCI_ENABLE, &value);
136 if (ACPI_FAILURE(status)) {
137 return_UINT32(ACPI_SYS_MODE_LEGACY);
138 }
139
140 if (value) {
141 return_UINT32(ACPI_SYS_MODE_ACPI);
142 } else {
143 return_UINT32(ACPI_SYS_MODE_LEGACY);
144 }
145}
146
147#endif /* !ACPI_REDUCED_HARDWARE */