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 - 2011, 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 "acpi.h"
46 #include "accommon.h"
47 #include "acevents.h"
48
49
50 #define _COMPONENT ACPI_EVENTS
51 ACPI_MODULE_NAME ("evsci")
52
53 /* Local prototypes */
54
55 static UINT32 ACPI_SYSTEM_XFACE
56 AcpiEvSciXruptHandler (
57 void *Context);
58
59
60 /*******************************************************************************
61 *
62 * FUNCTION: AcpiEvSciXruptHandler
63 *
64 * PARAMETERS: Context - Calling Context
65 *
66 * RETURN: Status code indicates whether interrupt was handled.
67 *
68 * DESCRIPTION: Interrupt handler that will figure out what function or
69 * control method to call to deal with a SCI.
70 *
71 ******************************************************************************/
72
73 static UINT32 ACPI_SYSTEM_XFACE
74 AcpiEvSciXruptHandler (
75 void *Context)
76 {
77 ACPI_GPE_XRUPT_INFO *GpeXruptList = Context;
78 UINT32 InterruptHandled = ACPI_INTERRUPT_NOT_HANDLED;
79
80
81 ACPI_FUNCTION_TRACE (EvSciXruptHandler);
82
83
84 /*
85 * We are guaranteed by the ACPI CA initialization/shutdown code that
86 * if this interrupt handler is installed, ACPI is enabled.
87 */
88
89 /*
90 * Fixed Events:
91 * Check for and dispatch any Fixed Events that have occurred
92 */
93 InterruptHandled |= AcpiEvFixedEventDetect ();
94
95 /*
96 * General Purpose Events:
97 * Check for and dispatch any GPEs that have occurred
98 */
99 InterruptHandled |= AcpiEvGpeDetect (GpeXruptList);
100
101 AcpiSciCount++;
102 return_UINT32 (InterruptHandled);
103 }
104
105
106 /*******************************************************************************
107 *
108 * FUNCTION: AcpiEvGpeXruptHandler
109 *
110 * PARAMETERS: Context - Calling Context
111 *
112 * RETURN: Status code indicates whether interrupt was handled.
113 *
114 * DESCRIPTION: Handler for GPE Block Device interrupts
115 *
116 ******************************************************************************/
117
118 UINT32 ACPI_SYSTEM_XFACE
119 AcpiEvGpeXruptHandler (
120 void *Context)
121 {
122 ACPI_GPE_XRUPT_INFO *GpeXruptList = Context;
123 UINT32 InterruptHandled = ACPI_INTERRUPT_NOT_HANDLED;
124
125
126 ACPI_FUNCTION_TRACE (EvGpeXruptHandler);
127
128
129 /*
130 * We are guaranteed by the ACPI CA initialization/shutdown code that
131 * if this interrupt handler is installed, ACPI is enabled.
132 */
133
134 /* GPEs: Check for and dispatch any GPEs that have occurred */
135
136 InterruptHandled |= AcpiEvGpeDetect (GpeXruptList);
137
138 return_UINT32 (InterruptHandled);
139 }
140
141
142 /******************************************************************************
143 *
144 * FUNCTION: AcpiEvInstallSciHandler
145 *
146 * PARAMETERS: none
147 *
148 * RETURN: Status
149 *
150 * DESCRIPTION: Installs SCI handler.
151 *
152 ******************************************************************************/
153
154 UINT32
155 AcpiEvInstallSciHandler (
156 void)
157 {
158 UINT32 Status = AE_OK;
159
160
161 ACPI_FUNCTION_TRACE (EvInstallSciHandler);
162
163
164 Status = AcpiOsInstallInterruptHandler ((UINT32) AcpiGbl_FADT.SciInterrupt,
165 AcpiEvSciXruptHandler, AcpiGbl_GpeXruptListHead);
166 return_ACPI_STATUS (Status);
167 }
168
169
170 /******************************************************************************
171 *
172 * FUNCTION: AcpiEvRemoveSciHandler
173 *
174 * PARAMETERS: none
175 *
176 * RETURN: E_OK if handler uninstalled OK, E_ERROR if handler was not
177 * installed to begin with
178 *
179 * DESCRIPTION: Remove the SCI interrupt handler. No further SCIs will be
180 * taken.
181 *
182 * Note: It doesn't seem important to disable all events or set the event
183 * enable registers to their original values. The OS should disable
184 * the SCI interrupt level when the handler is removed, so no more
185 * events will come in.
186 *
187 ******************************************************************************/
188
189 ACPI_STATUS
190 AcpiEvRemoveSciHandler (
191 void)
192 {
193 ACPI_STATUS Status;
194
195
196 ACPI_FUNCTION_TRACE (EvRemoveSciHandler);
197
198
199 /* Just let the OS remove the handler and disable the level */
200
201 Status = AcpiOsRemoveInterruptHandler ((UINT32) AcpiGbl_FADT.SciInterrupt,
202 AcpiEvSciXruptHandler);
203
204 return_ACPI_STATUS (Status);
205 }
206
207