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 <acpi/acpi.h>
46 #include "accommon.h"
47 #include "acevents.h"
48
49 #define _COMPONENT ACPI_EVENTS
50 ACPI_MODULE_NAME("evsci")
51 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */
52 /* Local prototypes */
53 static u32 ACPI_SYSTEM_XFACE acpi_ev_sci_xrupt_handler(void *context);
54
55 /*******************************************************************************
56 *
57 * FUNCTION: acpi_ev_sci_xrupt_handler
58 *
59 * PARAMETERS: Context - Calling Context
60 *
61 * RETURN: Status code indicates whether interrupt was handled.
62 *
63 * DESCRIPTION: Interrupt handler that will figure out what function or
64 * control method to call to deal with a SCI.
65 *
66 ******************************************************************************/
67
acpi_ev_sci_xrupt_handler(void * context)68 static u32 ACPI_SYSTEM_XFACE acpi_ev_sci_xrupt_handler(void *context)
69 {
70 struct acpi_gpe_xrupt_info *gpe_xrupt_list = context;
71 u32 interrupt_handled = ACPI_INTERRUPT_NOT_HANDLED;
72
73 ACPI_FUNCTION_TRACE(ev_sci_xrupt_handler);
74
75 /*
76 * We are guaranteed by the ACPI CA initialization/shutdown code that
77 * if this interrupt handler is installed, ACPI is enabled.
78 */
79
80 /*
81 * Fixed Events:
82 * Check for and dispatch any Fixed Events that have occurred
83 */
84 interrupt_handled |= acpi_ev_fixed_event_detect();
85
86 /*
87 * General Purpose Events:
88 * Check for and dispatch any GPEs that have occurred
89 */
90 interrupt_handled |= acpi_ev_gpe_detect(gpe_xrupt_list);
91
92 return_UINT32(interrupt_handled);
93 }
94
95 /*******************************************************************************
96 *
97 * FUNCTION: acpi_ev_gpe_xrupt_handler
98 *
99 * PARAMETERS: Context - Calling Context
100 *
101 * RETURN: Status code indicates whether interrupt was handled.
102 *
103 * DESCRIPTION: Handler for GPE Block Device interrupts
104 *
105 ******************************************************************************/
106
acpi_ev_gpe_xrupt_handler(void * context)107 u32 ACPI_SYSTEM_XFACE acpi_ev_gpe_xrupt_handler(void *context)
108 {
109 struct acpi_gpe_xrupt_info *gpe_xrupt_list = context;
110 u32 interrupt_handled = ACPI_INTERRUPT_NOT_HANDLED;
111
112 ACPI_FUNCTION_TRACE(ev_gpe_xrupt_handler);
113
114 /*
115 * We are guaranteed by the ACPI CA initialization/shutdown code that
116 * if this interrupt handler is installed, ACPI is enabled.
117 */
118
119 /* GPEs: Check for and dispatch any GPEs that have occurred */
120
121 interrupt_handled |= acpi_ev_gpe_detect(gpe_xrupt_list);
122
123 return_UINT32(interrupt_handled);
124 }
125
126 /******************************************************************************
127 *
128 * FUNCTION: acpi_ev_install_sci_handler
129 *
130 * PARAMETERS: none
131 *
132 * RETURN: Status
133 *
134 * DESCRIPTION: Installs SCI handler.
135 *
136 ******************************************************************************/
137
acpi_ev_install_sci_handler(void)138 u32 acpi_ev_install_sci_handler(void)
139 {
140 u32 status = AE_OK;
141
142 ACPI_FUNCTION_TRACE(ev_install_sci_handler);
143
144 status =
145 acpi_os_install_interrupt_handler((u32) acpi_gbl_FADT.sci_interrupt,
146 acpi_ev_sci_xrupt_handler,
147 acpi_gbl_gpe_xrupt_list_head);
148 return_ACPI_STATUS(status);
149 }
150
151 /******************************************************************************
152 *
153 * FUNCTION: acpi_ev_remove_sci_handler
154 *
155 * PARAMETERS: none
156 *
157 * RETURN: E_OK if handler uninstalled OK, E_ERROR if handler was not
158 * installed to begin with
159 *
160 * DESCRIPTION: Remove the SCI interrupt handler. No further SCIs will be
161 * taken.
162 *
163 * Note: It doesn't seem important to disable all events or set the event
164 * enable registers to their original values. The OS should disable
165 * the SCI interrupt level when the handler is removed, so no more
166 * events will come in.
167 *
168 ******************************************************************************/
169
acpi_ev_remove_sci_handler(void)170 acpi_status acpi_ev_remove_sci_handler(void)
171 {
172 acpi_status status;
173
174 ACPI_FUNCTION_TRACE(ev_remove_sci_handler);
175
176 /* Just let the OS remove the handler and disable the level */
177
178 status =
179 acpi_os_remove_interrupt_handler((u32) acpi_gbl_FADT.sci_interrupt,
180 acpi_ev_sci_xrupt_handler);
181
182 return_ACPI_STATUS(status);
183 }
184
185 #endif /* !ACPI_REDUCED_HARDWARE */
186