blob: 679a112a7d2692b140776ec44554288b1e2557ca [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001
2/******************************************************************************
3 *
4 * Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface
5 *
6 *****************************************************************************/
7
8/*
Bob Moorea8357b02010-01-22 19:07:36 +08009 * Copyright (C) 2000 - 2010, Intel Corp.
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <acpi/acpi.h>
Len Browne2f7a772009-01-09 00:30:03 -050046#include "accommon.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#define _COMPONENT ACPI_HARDWARE
Len Brown4be44fc2005-08-05 00:44:28 -040049ACPI_MODULE_NAME("hwacpi")
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
51/******************************************************************************
52 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 * 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 ******************************************************************************/
Len Brown4be44fc2005-08-05 00:44:28 -040062acpi_status acpi_hw_set_mode(u32 mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -070063{
64
Len Brown4be44fc2005-08-05 00:44:28 -040065 acpi_status status;
66 u32 retry;
Linus Torvalds1da177e2005-04-16 15:20:36 -070067
Bob Mooreb229cf92006-04-21 17:15:00 -040068 ACPI_FUNCTION_TRACE(hw_set_mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
70 /*
71 * ACPI 2.0 clarified that if SMI_CMD in FADT is zero,
72 * system does not support mode transition.
73 */
Bob Mooref3d2e782007-02-02 19:48:18 +030074 if (!acpi_gbl_FADT.smi_command) {
Bob Mooreb8e4d892006-01-27 16:43:00 -050075 ACPI_ERROR((AE_INFO,
76 "No SMI_CMD in FADT, mode transition failed"));
Len Brown4be44fc2005-08-05 00:44:28 -040077 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 }
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 */
Bob Mooref3d2e782007-02-02 19:48:18 +030087 if (!acpi_gbl_FADT.acpi_enable && !acpi_gbl_FADT.acpi_disable) {
Bob Mooreb8e4d892006-01-27 16:43:00 -050088 ACPI_ERROR((AE_INFO,
Bob Moored4913dc2009-03-06 10:05:18 +080089 "No ACPI mode transition supported in this system "
90 "(enable/disable both zero)"));
Len Brown4be44fc2005-08-05 00:44:28 -040091 return_ACPI_STATUS(AE_OK);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 }
93
94 switch (mode) {
95 case ACPI_SYS_MODE_ACPI:
96
97 /* BIOS should have disabled ALL fixed and GP events */
98
Bob Moore7f071902009-03-19 09:37:47 +080099 status = acpi_hw_write_port(acpi_gbl_FADT.smi_command,
Bob Mooref3d2e782007-02-02 19:48:18 +0300100 (u32) acpi_gbl_FADT.acpi_enable, 8);
Len Brown4be44fc2005-08-05 00:44:28 -0400101 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
102 "Attempting to enable ACPI mode\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 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 */
Bob Moore7f071902009-03-19 09:37:47 +0800111 status = acpi_hw_write_port(acpi_gbl_FADT.smi_command,
Bob Mooref3d2e782007-02-02 19:48:18 +0300112 (u32) acpi_gbl_FADT.acpi_disable,
Len Brown4be44fc2005-08-05 00:44:28 -0400113 8);
114 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
115 "Attempting to enable Legacy (non-ACPI) mode\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 break;
117
118 default:
Len Brown4be44fc2005-08-05 00:44:28 -0400119 return_ACPI_STATUS(AE_BAD_PARAMETER);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 }
121
Len Brown4be44fc2005-08-05 00:44:28 -0400122 if (ACPI_FAILURE(status)) {
Bob Mooreb8e4d892006-01-27 16:43:00 -0500123 ACPI_EXCEPTION((AE_INFO, status,
124 "Could not write ACPI mode change"));
Len Brown4be44fc2005-08-05 00:44:28 -0400125 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 }
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) {
Len Brown4be44fc2005-08-05 00:44:28 -0400135 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
136 "Mode %X successfully enabled\n",
137 mode));
138 return_ACPI_STATUS(AE_OK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 }
140 acpi_os_stall(1000);
141 retry--;
142 }
143
Bob Mooreb8e4d892006-01-27 16:43:00 -0500144 ACPI_ERROR((AE_INFO, "Hardware did not change modes"));
Len Brown4be44fc2005-08-05 00:44:28 -0400145 return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146}
147
Robert Moore44f6c012005-04-18 22:49:35 -0400148/*******************************************************************************
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 *
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
Len Brown4be44fc2005-08-05 00:44:28 -0400161u32 acpi_hw_get_mode(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162{
Len Brown4be44fc2005-08-05 00:44:28 -0400163 acpi_status status;
164 u32 value;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165
Bob Mooreb229cf92006-04-21 17:15:00 -0400166 ACPI_FUNCTION_TRACE(hw_get_mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
168 /*
169 * ACPI 2.0 clarified that if SMI_CMD in FADT is zero,
170 * system does not support mode transition.
171 */
Bob Mooref3d2e782007-02-02 19:48:18 +0300172 if (!acpi_gbl_FADT.smi_command) {
Bob Moore50eca3e2005-09-30 19:03:00 -0400173 return_UINT32(ACPI_SYS_MODE_ACPI);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 }
175
Bob Moore50ffba12009-02-23 15:02:07 +0800176 status = acpi_read_bit_register(ACPI_BITREG_SCI_ENABLE, &value);
Len Brown4be44fc2005-08-05 00:44:28 -0400177 if (ACPI_FAILURE(status)) {
Bob Moore50eca3e2005-09-30 19:03:00 -0400178 return_UINT32(ACPI_SYS_MODE_LEGACY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 }
180
181 if (value) {
Bob Moore50eca3e2005-09-30 19:03:00 -0400182 return_UINT32(ACPI_SYS_MODE_ACPI);
Len Brown4be44fc2005-08-05 00:44:28 -0400183 } else {
Bob Moore50eca3e2005-09-30 19:03:00 -0400184 return_UINT32(ACPI_SYS_MODE_LEGACY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 }
186}