1 /*-
2 * Copyright (c) 2001 Mitsuru IWASAKI
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: releng/5.1/sys/dev/acpica/acpica_support.c 99682 2002-07-09 17:54:02Z iwasaki $
27 */
28
29 #include "acpi.h"
30 #include <machine/cpufunc.h>
31 #include <dev/acpica/acpica_support.h>
32
33 ACPI_MODULE_NAME("SUPPORT")
34
35 /*
36 * Implement support code temporary here until officially merged into
37 * Intel ACPI CA release.
38 */
39
40 #undef _COMPONENT
41 #define _COMPONENT ACPI_HARDWARE
42
43 /******************************************************************************
44 *
45 * FUNCTION: AcpiEnterSleepStateS4Bios
46 *
47 * PARAMETERS: None
48 *
49 * RETURN: Status
50 *
51 * DESCRIPTION: Enter a system sleep state S4BIOS
52 *
53 ******************************************************************************/
54
55 ACPI_STATUS
56 AcpiEnterSleepStateS4Bios (
57 void)
58 {
59 ACPI_OBJECT_LIST ArgList;
60 ACPI_OBJECT Arg;
61 UINT32 Value;
62
63
64 ACPI_FUNCTION_TRACE ("AcpiEnterSleepStateS4Bios");
65
66 /* run the _PTS and _GTS methods */
67
68 ACPI_MEMSET(&ArgList, 0, sizeof(ArgList));
69 ArgList.Count = 1;
70 ArgList.Pointer = &Arg;
71
72 ACPI_MEMSET(&Arg, 0, sizeof(Arg));
73 Arg.Type = ACPI_TYPE_INTEGER;
74 Arg.Integer.Value = ACPI_STATE_S4;
75
76 AcpiEvaluateObject (NULL, "\\_PTS", &ArgList, NULL);
77 AcpiEvaluateObject (NULL, "\\_GTS", &ArgList, NULL);
78
79 /* clear wake status */
80
81 AcpiSetRegister (ACPI_BITREG_WAKE_STATUS, 1, ACPI_MTX_LOCK);
82
83 ACPI_DISABLE_IRQS ();
84
85 AcpiHwDisableNonWakeupGpes();
86
87 /* flush caches */
88
89 ACPI_FLUSH_CPU_CACHE ();
90
91 /* write the value to command port and wait until we enter sleep state */
92 do
93 {
94 AcpiOsStall(1000000);
95 AcpiOsWritePort (AcpiGbl_FADT->SmiCmd, AcpiGbl_FADT->S4BiosReq, 8);
96 AcpiGetRegister (ACPI_BITREG_WAKE_STATUS, &Value, ACPI_MTX_LOCK);
97 }
98 while (!Value);
99
100 AcpiHwEnableNonWakeupGpes();
101
102 ACPI_ENABLE_IRQS ();
103
104 return_ACPI_STATUS (AE_OK);
105 }
106
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