0dff876e230cb9e56865f8aa3628f762a9db9dd1
1 /******************************************************************************
3 * Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface
5 *****************************************************************************/
7 /******************************************************************************
11 * Some or all of this work - Copyright (c) 1999 - 2014, Intel Corp.
12 * All rights reserved.
16 * 2.1. This is your license from Intel Corp. under its intellectual property
17 * rights. You may have additional license terms from the party that provided
18 * you this software, covering your right to use that party's intellectual
21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
22 * copy of the source code appearing in this file ("Covered Code") an
23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
24 * base code distributed originally by Intel ("Original Intel Code") to copy,
25 * make derivatives, distribute, use and display any portion of the Covered
26 * Code in any form, with the right to sublicense such rights; and
28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
29 * license (with the right to sublicense), under only those claims of Intel
30 * patents that are infringed by the Original Intel Code, to make, use, sell,
31 * offer to sell, and import the Covered Code and derivative works thereof
32 * solely to the minimum extent necessary to exercise the above copyright
33 * license, and in no event shall the patent license extend to any additions
34 * to or modifications of the Original Intel Code. No other license or right
35 * is granted directly or by implication, estoppel or otherwise;
37 * The above copyright and patent license is granted only if the following
42 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
43 * Redistribution of source code of any substantial portion of the Covered
44 * Code or modification with rights to further distribute source must include
45 * the above Copyright Notice, the above License, this list of Conditions,
46 * and the following Disclaimer and Export Compliance provision. In addition,
47 * Licensee must cause all Covered Code to which Licensee contributes to
48 * contain a file documenting the changes Licensee made to create that Covered
49 * Code and the date of any change. Licensee must include in that file the
50 * documentation of any changes made by any predecessor Licensee. Licensee
51 * must include a prominent statement that the modification is derived,
52 * directly or indirectly, from Original Intel Code.
54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
55 * Redistribution of source code of any substantial portion of the Covered
56 * Code or modification without rights to further distribute source must
57 * include the following Disclaimer and Export Compliance provision in the
58 * documentation and/or other materials provided with distribution. In
59 * addition, Licensee may not authorize further sublicense of source of any
60 * portion of the Covered Code, and must include terms to the effect that the
61 * license from Licensee to its licensee is limited to the intellectual
62 * property embodied in the software Licensee provides to its licensee, and
63 * not to intellectual property embodied in modifications its licensee may
66 * 3.3. Redistribution of Executable. Redistribution in executable form of any
67 * substantial portion of the Covered Code or modification must reproduce the
68 * above Copyright Notice, and the following Disclaimer and Export Compliance
69 * provision in the documentation and/or other materials provided with the
72 * 3.4. Intel retains all right, title, and interest in and to the Original
75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
76 * Intel shall be used in advertising or otherwise to promote the sale, use or
77 * other dealings in products derived from or relating to the Covered Code
78 * without prior written authorization from Intel.
80 * 4. Disclaimer and Export Compliance
82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
99 * 4.3. Licensee shall not export, either directly or indirectly, any of this
100 * software or system incorporating such software without first obtaining any
101 * required license or other approval from the U. S. Department of Commerce or
102 * any other agency or department of the United States Government. In the
103 * event Licensee exports any such software from the United States or
104 * re-exports any such software from a foreign destination, Licensee shall
105 * ensure that the distribution and export/re-export of the software is in
106 * compliance with all laws, regulations, orders, or other restrictions of the
107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
108 * any of its subsidiaries will export/re-export any technical data, process,
109 * software, or service, directly or indirectly, to any country for which the
110 * United States government or any agency thereof requires an export license,
111 * other governmental approval, or letter of assurance, without first obtaining
112 * such license, approval or letter.
114 *****************************************************************************/
117 #include "accommon.h"
120 #define _COMPONENT ACPI_HARDWARE
121 ACPI_MODULE_NAME ("hwacpi")
124 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */
125 /******************************************************************************
127 * FUNCTION: AcpiHwSetMode
129 * PARAMETERS: Mode - SYS_MODE_ACPI or SYS_MODE_LEGACY
133 * DESCRIPTION: Transitions the system into the requested mode.
135 ******************************************************************************/
146 ACPI_FUNCTION_TRACE (HwSetMode
);
149 /* If the Hardware Reduced flag is set, machine is always in acpi mode */
151 if (AcpiGbl_ReducedHardware
)
153 return_ACPI_STATUS (AE_OK
);
157 * ACPI 2.0 clarified that if SMI_CMD in FADT is zero,
158 * system does not support mode transition.
160 if (!AcpiGbl_FADT
.SmiCommand
)
162 ACPI_ERROR ((AE_INFO
, "No SMI_CMD in FADT, mode transition failed"));
163 return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE
);
167 * ACPI 2.0 clarified the meaning of ACPI_ENABLE and ACPI_DISABLE
168 * in FADT: If it is zero, enabling or disabling is not supported.
169 * As old systems may have used zero for mode transition,
170 * we make sure both the numbers are zero to determine these
171 * transitions are not supported.
173 if (!AcpiGbl_FADT
.AcpiEnable
&& !AcpiGbl_FADT
.AcpiDisable
)
175 ACPI_ERROR ((AE_INFO
,
176 "No ACPI mode transition supported in this system "
177 "(enable/disable both zero)"));
178 return_ACPI_STATUS (AE_OK
);
183 case ACPI_SYS_MODE_ACPI
:
185 /* BIOS should have disabled ALL fixed and GP events */
187 Status
= AcpiHwWritePort (AcpiGbl_FADT
.SmiCommand
,
188 (UINT32
) AcpiGbl_FADT
.AcpiEnable
, 8);
189 ACPI_DEBUG_PRINT ((ACPI_DB_INFO
, "Attempting to enable ACPI mode\n"));
192 case ACPI_SYS_MODE_LEGACY
:
194 * BIOS should clear all fixed status bits and restore fixed event
195 * enable bits to default
197 Status
= AcpiHwWritePort (AcpiGbl_FADT
.SmiCommand
,
198 (UINT32
) AcpiGbl_FADT
.AcpiDisable
, 8);
199 ACPI_DEBUG_PRINT ((ACPI_DB_INFO
,
200 "Attempting to enable Legacy (non-ACPI) mode\n"));
205 return_ACPI_STATUS (AE_BAD_PARAMETER
);
208 if (ACPI_FAILURE (Status
))
210 ACPI_EXCEPTION ((AE_INFO
, Status
,
211 "Could not write ACPI mode change"));
212 return_ACPI_STATUS (Status
);
216 * Some hardware takes a LONG time to switch modes. Give them 3 sec to
217 * do so, but allow faster systems to proceed more quickly.
222 if (AcpiHwGetMode () == Mode
)
224 ACPI_DEBUG_PRINT ((ACPI_DB_INFO
, "Mode %X successfully enabled\n",
226 return_ACPI_STATUS (AE_OK
);
228 AcpiOsStall (ACPI_USEC_PER_MSEC
);
232 ACPI_ERROR ((AE_INFO
, "Hardware did not change modes"));
233 return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE
);
237 /*******************************************************************************
239 * FUNCTION: AcpiHwGetMode
243 * RETURN: SYS_MODE_ACPI or SYS_MODE_LEGACY
245 * DESCRIPTION: Return current operating state of system. Determined by
246 * querying the SCI_EN bit.
248 ******************************************************************************/
258 ACPI_FUNCTION_TRACE (HwGetMode
);
261 /* If the Hardware Reduced flag is set, machine is always in acpi mode */
263 if (AcpiGbl_ReducedHardware
)
265 return_UINT32 (ACPI_SYS_MODE_ACPI
);
269 * ACPI 2.0 clarified that if SMI_CMD in FADT is zero,
270 * system does not support mode transition.
272 if (!AcpiGbl_FADT
.SmiCommand
)
274 return_UINT32 (ACPI_SYS_MODE_ACPI
);
277 Status
= AcpiReadBitRegister (ACPI_BITREG_SCI_ENABLE
, &Value
);
278 if (ACPI_FAILURE (Status
))
280 return_UINT32 (ACPI_SYS_MODE_LEGACY
);
285 return_UINT32 (ACPI_SYS_MODE_ACPI
);
289 return_UINT32 (ACPI_SYS_MODE_LEGACY
);
293 #endif /* !ACPI_REDUCED_HARDWARE */