1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2/*******************************************************************************
3 *
4 * Module Name: evsci - System Control Interrupt configuration and
5 * legacy to ACPI mode state transition functions
6 *
7 ******************************************************************************/
8
9#include <acpi/acpi.h>
10#include "accommon.h"
11#include "acevents.h"
12
13#define _COMPONENT ACPI_EVENTS
14ACPI_MODULE_NAME("evsci")
15#if (!ACPI_REDUCED_HARDWARE) /* Entire module */
16/* Local prototypes */
17static u32 ACPI_SYSTEM_XFACE acpi_ev_sci_xrupt_handler(void *context);
18
19/*******************************************************************************
20 *
21 * FUNCTION: acpi_ev_sci_dispatch
22 *
23 * PARAMETERS: None
24 *
25 * RETURN: Status code indicates whether interrupt was handled.
26 *
27 * DESCRIPTION: Dispatch the SCI to all host-installed SCI handlers.
28 *
29 ******************************************************************************/
30
31u32 acpi_ev_sci_dispatch(void)
32{
33 struct acpi_sci_handler_info *sci_handler;
34 acpi_cpu_flags flags;
35 u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
36
37 ACPI_FUNCTION_NAME(ev_sci_dispatch);
38
39 /* Are there any host-installed SCI handlers? */
40
41 if (!acpi_gbl_sci_handler_list) {
42 return (int_status);
43 }
44
45 flags = acpi_os_acquire_lock(handle: acpi_gbl_gpe_lock);
46
47 /* Invoke all host-installed SCI handlers */
48
49 sci_handler = acpi_gbl_sci_handler_list;
50 while (sci_handler) {
51
52 /* Invoke the installed handler (at interrupt level) */
53
54 int_status |= sci_handler->address(sci_handler->context);
55
56 sci_handler = sci_handler->next;
57 }
58
59 acpi_os_release_lock(handle: acpi_gbl_gpe_lock, flags);
60 return (int_status);
61}
62
63/*******************************************************************************
64 *
65 * FUNCTION: acpi_ev_sci_xrupt_handler
66 *
67 * PARAMETERS: context - Calling Context
68 *
69 * RETURN: Status code indicates whether interrupt was handled.
70 *
71 * DESCRIPTION: Interrupt handler that will figure out what function or
72 * control method to call to deal with a SCI.
73 *
74 ******************************************************************************/
75
76static u32 ACPI_SYSTEM_XFACE acpi_ev_sci_xrupt_handler(void *context)
77{
78 struct acpi_gpe_xrupt_info *gpe_xrupt_list = context;
79 u32 interrupt_handled = ACPI_INTERRUPT_NOT_HANDLED;
80
81 ACPI_FUNCTION_TRACE(ev_sci_xrupt_handler);
82
83 /*
84 * We are guaranteed by the ACPICA initialization/shutdown code that
85 * if this interrupt handler is installed, ACPI is enabled.
86 */
87
88 /*
89 * Fixed Events:
90 * Check for and dispatch any Fixed Events that have occurred
91 */
92 interrupt_handled |= acpi_ev_fixed_event_detect();
93
94 /*
95 * General Purpose Events:
96 * Check for and dispatch any GPEs that have occurred
97 */
98 interrupt_handled |= acpi_ev_gpe_detect(gpe_xrupt_list);
99
100 /* Invoke all host-installed SCI handlers */
101
102 interrupt_handled |= acpi_ev_sci_dispatch();
103
104 acpi_sci_count++;
105 return_UINT32(interrupt_handled);
106}
107
108/*******************************************************************************
109 *
110 * FUNCTION: acpi_ev_gpe_xrupt_handler
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
120u32 ACPI_SYSTEM_XFACE acpi_ev_gpe_xrupt_handler(void *context)
121{
122 struct acpi_gpe_xrupt_info *gpe_xrupt_list = context;
123 u32 interrupt_handled = ACPI_INTERRUPT_NOT_HANDLED;
124
125 ACPI_FUNCTION_TRACE(ev_gpe_xrupt_handler);
126
127 /*
128 * We are guaranteed by the ACPICA initialization/shutdown code that
129 * if this interrupt handler is installed, ACPI is enabled.
130 */
131
132 /* GPEs: Check for and dispatch any GPEs that have occurred */
133
134 interrupt_handled |= acpi_ev_gpe_detect(gpe_xrupt_list);
135 return_UINT32(interrupt_handled);
136}
137
138/******************************************************************************
139 *
140 * FUNCTION: acpi_ev_install_sci_handler
141 *
142 * PARAMETERS: none
143 *
144 * RETURN: Status
145 *
146 * DESCRIPTION: Installs SCI handler.
147 *
148 ******************************************************************************/
149
150u32 acpi_ev_install_sci_handler(void)
151{
152 u32 status = AE_OK;
153
154 ACPI_FUNCTION_TRACE(ev_install_sci_handler);
155
156 status =
157 acpi_os_install_interrupt_handler(interrupt_number: (u32) acpi_gbl_FADT.sci_interrupt,
158 service_routine: acpi_ev_sci_xrupt_handler,
159 context: acpi_gbl_gpe_xrupt_list_head);
160 return_ACPI_STATUS(status);
161}
162
163/******************************************************************************
164 *
165 * FUNCTION: acpi_ev_remove_all_sci_handlers
166 *
167 * PARAMETERS: none
168 *
169 * RETURN: AE_OK if handler uninstalled, AE_ERROR if handler was not
170 * installed to begin with
171 *
172 * DESCRIPTION: Remove the SCI interrupt handler. No further SCIs will be
173 * taken. Remove all host-installed SCI handlers.
174 *
175 * Note: It doesn't seem important to disable all events or set the event
176 * enable registers to their original values. The OS should disable
177 * the SCI interrupt level when the handler is removed, so no more
178 * events will come in.
179 *
180 ******************************************************************************/
181
182acpi_status acpi_ev_remove_all_sci_handlers(void)
183{
184 struct acpi_sci_handler_info *sci_handler;
185 acpi_cpu_flags flags;
186 acpi_status status;
187
188 ACPI_FUNCTION_TRACE(ev_remove_all_sci_handlers);
189
190 /* Just let the OS remove the handler and disable the level */
191
192 status =
193 acpi_os_remove_interrupt_handler(interrupt_number: (u32) acpi_gbl_FADT.sci_interrupt,
194 service_routine: acpi_ev_sci_xrupt_handler);
195
196 if (!acpi_gbl_sci_handler_list) {
197 return (status);
198 }
199
200 flags = acpi_os_acquire_lock(handle: acpi_gbl_gpe_lock);
201
202 /* Free all host-installed SCI handlers */
203
204 while (acpi_gbl_sci_handler_list) {
205 sci_handler = acpi_gbl_sci_handler_list;
206 acpi_gbl_sci_handler_list = sci_handler->next;
207 ACPI_FREE(sci_handler);
208 }
209
210 acpi_os_release_lock(handle: acpi_gbl_gpe_lock, flags);
211 return_ACPI_STATUS(status);
212}
213
214#endif /* !ACPI_REDUCED_HARDWARE */
215