evsci.c revision 231844 
1/*******************************************************************************
2 *
3 * Module Name: evsci - System Control Interrupt configuration and
4 *                      legacy to ACPI mode state transition functions
5 *
6 ******************************************************************************/
7
8/*
9 * Copyright (C) 2000 - 2012, Intel Corp.
10 * 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
45#include <contrib/dev/acpica/include/acpi.h>
46#include <contrib/dev/acpica/include/accommon.h>
47#include <contrib/dev/acpica/include/acevents.h>
48
49
50#define _COMPONENT          ACPI_EVENTS
51        ACPI_MODULE_NAME    ("evsci")
52
53#if (!ACPI_REDUCED_HARDWARE) /* Entire module */
54
55/* Local prototypes */
56
57static UINT32 ACPI_SYSTEM_XFACE
58AcpiEvSciXruptHandler (
59    void                    *Context);
60
61
62/*******************************************************************************
63 *
64 * FUNCTION:    AcpiEvSciXruptHandler
65 *
66 * PARAMETERS:  Context   - Calling Context
67 *
68 * RETURN:      Status code indicates whether interrupt was handled.
69 *
70 * DESCRIPTION: Interrupt handler that will figure out what function or
71 *              control method to call to deal with a SCI.
72 *
73 ******************************************************************************/
74
75static UINT32 ACPI_SYSTEM_XFACE
76AcpiEvSciXruptHandler (
77    void                    *Context)
78{
79    ACPI_GPE_XRUPT_INFO     *GpeXruptList = Context;
80    UINT32                  InterruptHandled = ACPI_INTERRUPT_NOT_HANDLED;
81
82
83    ACPI_FUNCTION_TRACE (EvSciXruptHandler);
84
85
86    /*
87     * We are guaranteed by the ACPI CA initialization/shutdown code that
88     * if this interrupt handler is installed, ACPI is enabled.
89     */
90
91    /*
92     * Fixed Events:
93     * Check for and dispatch any Fixed Events that have occurred
94     */
95    InterruptHandled |= AcpiEvFixedEventDetect ();
96
97    /*
98     * General Purpose Events:
99     * Check for and dispatch any GPEs that have occurred
100     */
101    InterruptHandled |= AcpiEvGpeDetect (GpeXruptList);
102
103    AcpiSciCount++;
104    return_UINT32 (InterruptHandled);
105}
106
107
108/*******************************************************************************
109 *
110 * FUNCTION:    AcpiEvGpeXruptHandler
111 *
112 * PARAMETERS:  Context   - Calling Context
113 *
114 * RETURN:      Status code indicates whether interrupt was handled.
115 *
116 * DESCRIPTION: Handler for GPE Block Device interrupts
117 *
118 ******************************************************************************/
119
120UINT32 ACPI_SYSTEM_XFACE
121AcpiEvGpeXruptHandler (
122    void                    *Context)
123{
124    ACPI_GPE_XRUPT_INFO     *GpeXruptList = Context;
125    UINT32                  InterruptHandled = ACPI_INTERRUPT_NOT_HANDLED;
126
127
128    ACPI_FUNCTION_TRACE (EvGpeXruptHandler);
129
130
131    /*
132     * We are guaranteed by the ACPI CA initialization/shutdown code that
133     * if this interrupt handler is installed, ACPI is enabled.
134     */
135
136    /* GPEs: Check for and dispatch any GPEs that have occurred */
137
138    InterruptHandled |= AcpiEvGpeDetect (GpeXruptList);
139
140    return_UINT32 (InterruptHandled);
141}
142
143
144/******************************************************************************
145 *
146 * FUNCTION:    AcpiEvInstallSciHandler
147 *
148 * PARAMETERS:  none
149 *
150 * RETURN:      Status
151 *
152 * DESCRIPTION: Installs SCI handler.
153 *
154 ******************************************************************************/
155
156UINT32
157AcpiEvInstallSciHandler (
158    void)
159{
160    UINT32                  Status = AE_OK;
161
162
163    ACPI_FUNCTION_TRACE (EvInstallSciHandler);
164
165
166    Status = AcpiOsInstallInterruptHandler ((UINT32) AcpiGbl_FADT.SciInterrupt,
167                AcpiEvSciXruptHandler, AcpiGbl_GpeXruptListHead);
168    return_ACPI_STATUS (Status);
169}
170
171
172/******************************************************************************
173 *
174 * FUNCTION:    AcpiEvRemoveSciHandler
175 *
176 * PARAMETERS:  none
177 *
178 * RETURN:      E_OK if handler uninstalled OK, E_ERROR if handler was not
179 *              installed to begin with
180 *
181 * DESCRIPTION: Remove the SCI interrupt handler. No further SCIs will be
182 *              taken.
183 *
184 * Note:  It doesn't seem important to disable all events or set the event
185 *        enable registers to their original values. The OS should disable
186 *        the SCI interrupt level when the handler is removed, so no more
187 *        events will come in.
188 *
189 ******************************************************************************/
190
191ACPI_STATUS
192AcpiEvRemoveSciHandler (
193    void)
194{
195    ACPI_STATUS             Status;
196
197
198    ACPI_FUNCTION_TRACE (EvRemoveSciHandler);
199
200
201    /* Just let the OS remove the handler and disable the level */
202
203    Status = AcpiOsRemoveInterruptHandler ((UINT32) AcpiGbl_FADT.SciInterrupt,
204                AcpiEvSciXruptHandler);
205
206    return_ACPI_STATUS (Status);
207}
208
209#endif /* !ACPI_REDUCED_HARDWARE */
210