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 - 2014, 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 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */
54
55 /* Local prototypes */
56
57 static UINT32 ACPI_SYSTEM_XFACE
58 AcpiEvSciXruptHandler (
59 void *Context);
60
61
62 /*******************************************************************************
63 *
64 * FUNCTION: AcpiEvSciDispatch
65 *
66 * PARAMETERS: None
67 *
68 * RETURN: Status code indicates whether interrupt was handled.
69 *
70 * DESCRIPTION: Dispatch the SCI to all host-installed SCI handlers.
71 *
72 ******************************************************************************/
73
74 UINT32
75 AcpiEvSciDispatch (
76 void)
77 {
78 ACPI_SCI_HANDLER_INFO *SciHandler;
79 ACPI_CPU_FLAGS Flags;
80 UINT32 IntStatus = ACPI_INTERRUPT_NOT_HANDLED;
81
82
83 ACPI_FUNCTION_NAME (EvSciDispatch);
84
85
86 /* Are there any host-installed SCI handlers? */
87
88 if (!AcpiGbl_SciHandlerList)
89 {
90 return (IntStatus);
91 }
92
93 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
94
95 /* Invoke all host-installed SCI handlers */
96
97 SciHandler = AcpiGbl_SciHandlerList;
98 while (SciHandler)
99 {
100 /* Invoke the installed handler (at interrupt level) */
101
102 IntStatus |= SciHandler->Address (
103 SciHandler->Context);
104
105 SciHandler = SciHandler->Next;
106 }
107
108 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
109 return (IntStatus);
110 }
111
112
113 /*******************************************************************************
114 *
115 * FUNCTION: AcpiEvSciXruptHandler
116 *
117 * PARAMETERS: Context - Calling Context
118 *
119 * RETURN: Status code indicates whether interrupt was handled.
120 *
121 * DESCRIPTION: Interrupt handler that will figure out what function or
122 * control method to call to deal with a SCI.
123 *
124 ******************************************************************************/
125
126 static UINT32 ACPI_SYSTEM_XFACE
127 AcpiEvSciXruptHandler (
128 void *Context)
129 {
130 ACPI_GPE_XRUPT_INFO *GpeXruptList = Context;
131 UINT32 InterruptHandled = ACPI_INTERRUPT_NOT_HANDLED;
132
133
134 ACPI_FUNCTION_TRACE (EvSciXruptHandler);
135
136
137 /*
138 * We are guaranteed by the ACPI CA initialization/shutdown code that
139 * if this interrupt handler is installed, ACPI is enabled.
140 */
141
142 /*
143 * Fixed Events:
144 * Check for and dispatch any Fixed Events that have occurred
145 */
146 InterruptHandled |= AcpiEvFixedEventDetect ();
147
148 /*
149 * General Purpose Events:
150 * Check for and dispatch any GPEs that have occurred
151 */
152 InterruptHandled |= AcpiEvGpeDetect (GpeXruptList);
153
154 /* Invoke all host-installed SCI handlers */
155
156 InterruptHandled |= AcpiEvSciDispatch ();
157
158 AcpiSciCount++;
159 return_UINT32 (InterruptHandled);
160 }
161
162
163 /*******************************************************************************
164 *
165 * FUNCTION: AcpiEvGpeXruptHandler
166 *
167 * PARAMETERS: Context - Calling Context
168 *
169 * RETURN: Status code indicates whether interrupt was handled.
170 *
171 * DESCRIPTION: Handler for GPE Block Device interrupts
172 *
173 ******************************************************************************/
174
175 UINT32 ACPI_SYSTEM_XFACE
176 AcpiEvGpeXruptHandler (
177 void *Context)
178 {
179 ACPI_GPE_XRUPT_INFO *GpeXruptList = Context;
180 UINT32 InterruptHandled = ACPI_INTERRUPT_NOT_HANDLED;
181
182
183 ACPI_FUNCTION_TRACE (EvGpeXruptHandler);
184
185
186 /*
187 * We are guaranteed by the ACPICA initialization/shutdown code that
188 * if this interrupt handler is installed, ACPI is enabled.
189 */
190
191 /* GPEs: Check for and dispatch any GPEs that have occurred */
192
193 InterruptHandled |= AcpiEvGpeDetect (GpeXruptList);
194 return_UINT32 (InterruptHandled);
195 }
196
197
198 /******************************************************************************
199 *
200 * FUNCTION: AcpiEvInstallSciHandler
201 *
202 * PARAMETERS: none
203 *
204 * RETURN: Status
205 *
206 * DESCRIPTION: Installs SCI handler.
207 *
208 ******************************************************************************/
209
210 UINT32
211 AcpiEvInstallSciHandler (
212 void)
213 {
214 UINT32 Status = AE_OK;
215
216
217 ACPI_FUNCTION_TRACE (EvInstallSciHandler);
218
219
220 Status = AcpiOsInstallInterruptHandler ((UINT32) AcpiGbl_FADT.SciInterrupt,
221 AcpiEvSciXruptHandler, AcpiGbl_GpeXruptListHead);
222 return_ACPI_STATUS (Status);
223 }
224
225
226 /******************************************************************************
227 *
228 * FUNCTION: AcpiEvRemoveAllSciHandlers
229 *
230 * PARAMETERS: none
231 *
232 * RETURN: AE_OK if handler uninstalled, AE_ERROR if handler was not
233 * installed to begin with
234 *
235 * DESCRIPTION: Remove the SCI interrupt handler. No further SCIs will be
236 * taken. Remove all host-installed SCI handlers.
237 *
238 * Note: It doesn't seem important to disable all events or set the event
239 * enable registers to their original values. The OS should disable
240 * the SCI interrupt level when the handler is removed, so no more
241 * events will come in.
242 *
243 ******************************************************************************/
244
245 ACPI_STATUS
246 AcpiEvRemoveAllSciHandlers (
247 void)
248 {
249 ACPI_SCI_HANDLER_INFO *SciHandler;
250 ACPI_CPU_FLAGS Flags;
251 ACPI_STATUS Status;
252
253
254 ACPI_FUNCTION_TRACE (EvRemoveAllSciHandlers);
255
256
257 /* Just let the OS remove the handler and disable the level */
258
259 Status = AcpiOsRemoveInterruptHandler ((UINT32) AcpiGbl_FADT.SciInterrupt,
260 AcpiEvSciXruptHandler);
261
262 if (!AcpiGbl_SciHandlerList)
263 {
264 return (Status);
265 }
266
267 Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock);
268
269 /* Free all host-installed SCI handlers */
270
271 while (AcpiGbl_SciHandlerList)
272 {
273 SciHandler = AcpiGbl_SciHandlerList;
274 AcpiGbl_SciHandlerList = SciHandler->Next;
275 ACPI_FREE (SciHandler);
276 }
277
278 AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags);
279 return_ACPI_STATUS (Status);
280 }
281
282 #endif /* !ACPI_REDUCED_HARDWARE */