1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 /******************************************************************************
3 *
4 * Module Name: evevent - Fixed Event handling and dispatch
5 *
6 * Copyright (C) 2000 - 2020, Intel Corp.
7 *
8 *****************************************************************************/
9
10 #include <acpi/acpi.h>
11 #include "accommon.h"
12 #include "acevents.h"
13
14 #define _COMPONENT ACPI_EVENTS
15 ACPI_MODULE_NAME("evevent")
16 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */
17 /* Local prototypes */
18 static acpi_status acpi_ev_fixed_event_initialize(void);
19
20 static u32 acpi_ev_fixed_event_dispatch(u32 event);
21
22 /*******************************************************************************
23 *
24 * FUNCTION: acpi_ev_initialize_events
25 *
26 * PARAMETERS: None
27 *
28 * RETURN: Status
29 *
30 * DESCRIPTION: Initialize global data structures for ACPI events (Fixed, GPE)
31 *
32 ******************************************************************************/
33
acpi_ev_initialize_events(void)34 acpi_status acpi_ev_initialize_events(void)
35 {
36 acpi_status status;
37
38 ACPI_FUNCTION_TRACE(ev_initialize_events);
39
40 /* If Hardware Reduced flag is set, there are no fixed events */
41
42 if (acpi_gbl_reduced_hardware) {
43 return_ACPI_STATUS(AE_OK);
44 }
45
46 /*
47 * Initialize the Fixed and General Purpose Events. This is done prior to
48 * enabling SCIs to prevent interrupts from occurring before the handlers
49 * are installed.
50 */
51 status = acpi_ev_fixed_event_initialize();
52 if (ACPI_FAILURE(status)) {
53 ACPI_EXCEPTION((AE_INFO, status,
54 "Unable to initialize fixed events"));
55 return_ACPI_STATUS(status);
56 }
57
58 status = acpi_ev_gpe_initialize();
59 if (ACPI_FAILURE(status)) {
60 ACPI_EXCEPTION((AE_INFO, status,
61 "Unable to initialize general purpose events"));
62 return_ACPI_STATUS(status);
63 }
64
65 return_ACPI_STATUS(status);
66 }
67
68 /*******************************************************************************
69 *
70 * FUNCTION: acpi_ev_install_xrupt_handlers
71 *
72 * PARAMETERS: None
73 *
74 * RETURN: Status
75 *
76 * DESCRIPTION: Install interrupt handlers for the SCI and Global Lock
77 *
78 ******************************************************************************/
79
acpi_ev_install_xrupt_handlers(void)80 acpi_status acpi_ev_install_xrupt_handlers(void)
81 {
82 acpi_status status;
83
84 ACPI_FUNCTION_TRACE(ev_install_xrupt_handlers);
85
86 /* If Hardware Reduced flag is set, there is no ACPI h/w */
87
88 if (acpi_gbl_reduced_hardware) {
89 return_ACPI_STATUS(AE_OK);
90 }
91
92 /* Install the SCI handler */
93
94 status = acpi_ev_install_sci_handler();
95 if (ACPI_FAILURE(status)) {
96 ACPI_EXCEPTION((AE_INFO, status,
97 "Unable to install System Control Interrupt handler"));
98 return_ACPI_STATUS(status);
99 }
100
101 /* Install the handler for the Global Lock */
102
103 status = acpi_ev_init_global_lock_handler();
104 if (ACPI_FAILURE(status)) {
105 ACPI_EXCEPTION((AE_INFO, status,
106 "Unable to initialize Global Lock handler"));
107 return_ACPI_STATUS(status);
108 }
109
110 acpi_gbl_events_initialized = TRUE;
111 return_ACPI_STATUS(status);
112 }
113
114 /*******************************************************************************
115 *
116 * FUNCTION: acpi_ev_fixed_event_initialize
117 *
118 * PARAMETERS: None
119 *
120 * RETURN: Status
121 *
122 * DESCRIPTION: Install the fixed event handlers and disable all fixed events.
123 *
124 ******************************************************************************/
125
acpi_ev_fixed_event_initialize(void)126 static acpi_status acpi_ev_fixed_event_initialize(void)
127 {
128 u32 i;
129 acpi_status status;
130
131 /*
132 * Initialize the structure that keeps track of fixed event handlers and
133 * disable all of the fixed events.
134 */
135 for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
136 acpi_gbl_fixed_event_handlers[i].handler = NULL;
137 acpi_gbl_fixed_event_handlers[i].context = NULL;
138
139 /* Disable the fixed event */
140
141 if (acpi_gbl_fixed_event_info[i].enable_register_id != 0xFF) {
142 status =
143 acpi_write_bit_register(acpi_gbl_fixed_event_info[i].enable_register_id,
144 (i == ACPI_EVENT_PCIE_WAKE) ? ACPI_ENABLE_EVENT : ACPI_DISABLE_EVENT);
145 if (ACPI_FAILURE(status)) {
146 return (status);
147 }
148 }
149 }
150
151 return (AE_OK);
152 }
153
154 /*******************************************************************************
155 *
156 * FUNCTION: acpi_ev_fixed_event_detect
157 *
158 * PARAMETERS: None
159 *
160 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
161 *
162 * DESCRIPTION: Checks the PM status register for active fixed events
163 *
164 ******************************************************************************/
165
acpi_ev_fixed_event_detect(void)166 u32 acpi_ev_fixed_event_detect(void)
167 {
168 u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
169 u32 fixed_status;
170 u32 fixed_enable;
171 u32 i;
172 acpi_status status;
173
174 ACPI_FUNCTION_NAME(ev_fixed_event_detect);
175
176 /*
177 * Read the fixed feature status and enable registers, as all the cases
178 * depend on their values. Ignore errors here.
179 */
180 status = acpi_hw_register_read(ACPI_REGISTER_PM1_STATUS, &fixed_status);
181 status |=
182 acpi_hw_register_read(ACPI_REGISTER_PM1_ENABLE, &fixed_enable);
183 if (ACPI_FAILURE(status)) {
184 return (int_status);
185 }
186
187 if (fixed_enable & ACPI_BITMASK_PCIEXP_WAKE_DISABLE)
188 fixed_enable &= ~ACPI_BITMASK_PCIEXP_WAKE_DISABLE;
189 else
190 fixed_enable |= ACPI_BITMASK_PCIEXP_WAKE_DISABLE;
191
192 ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
193 "Fixed Event Block: Enable %08X Status %08X\n",
194 fixed_enable, fixed_status));
195
196 /*
197 * Check for all possible Fixed Events and dispatch those that are active
198 */
199 for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
200
201 /* Both the status and enable bits must be on for this event */
202
203 if ((fixed_status & acpi_gbl_fixed_event_info[i].
204 status_bit_mask)
205 && (fixed_enable & acpi_gbl_fixed_event_info[i].
206 enable_bit_mask)) {
207 /*
208 * Found an active (signalled) event. Invoke global event
209 * handler if present.
210 */
211 acpi_fixed_event_count[i]++;
212 if (acpi_gbl_global_event_handler) {
213 acpi_gbl_global_event_handler
214 (ACPI_EVENT_TYPE_FIXED, NULL, i,
215 acpi_gbl_global_event_handler_context);
216 }
217
218 int_status |= acpi_ev_fixed_event_dispatch(i);
219 }
220 }
221
222 return (int_status);
223 }
224
225 /*******************************************************************************
226 *
227 * FUNCTION: acpi_ev_fixed_event_dispatch
228 *
229 * PARAMETERS: event - Event type
230 *
231 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
232 *
233 * DESCRIPTION: Clears the status bit for the requested event, calls the
234 * handler that previously registered for the event.
235 * NOTE: If there is no handler for the event, the event is
236 * disabled to prevent further interrupts.
237 *
238 ******************************************************************************/
239
acpi_ev_fixed_event_dispatch(u32 event)240 static u32 acpi_ev_fixed_event_dispatch(u32 event)
241 {
242
243 ACPI_FUNCTION_ENTRY();
244
245 /* Clear the status bit */
246
247 (void)acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
248 status_register_id, ACPI_CLEAR_STATUS);
249
250 /*
251 * Make sure that a handler exists. If not, report an error
252 * and disable the event to prevent further interrupts.
253 */
254 if (!acpi_gbl_fixed_event_handlers[event].handler) {
255 (void)acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
256 enable_register_id,
257 event == ACPI_EVENT_PCIE_WAKE ? ACPI_ENABLE_EVENT : ACPI_DISABLE_EVENT);
258
259 ACPI_ERROR((AE_INFO,
260 "No installed handler for fixed event - %s (%u), disabling",
261 acpi_ut_get_event_name(event), event));
262
263 return (ACPI_INTERRUPT_NOT_HANDLED);
264 }
265
266 /* Invoke the Fixed Event handler */
267
268 return ((acpi_gbl_fixed_event_handlers[event].
269 handler) (acpi_gbl_fixed_event_handlers[event].context));
270 }
271
272 /*******************************************************************************
273 *
274 * FUNCTION: acpi_any_fixed_event_status_set
275 *
276 * PARAMETERS: None
277 *
278 * RETURN: TRUE or FALSE
279 *
280 * DESCRIPTION: Checks the PM status register for active fixed events
281 *
282 ******************************************************************************/
283
acpi_any_fixed_event_status_set(void)284 u32 acpi_any_fixed_event_status_set(void)
285 {
286 acpi_status status;
287 u32 in_status;
288 u32 in_enable;
289 u32 i;
290
291 status = acpi_hw_register_read(ACPI_REGISTER_PM1_ENABLE, &in_enable);
292 if (ACPI_FAILURE(status)) {
293 return (FALSE);
294 }
295
296 status = acpi_hw_register_read(ACPI_REGISTER_PM1_STATUS, &in_status);
297 if (ACPI_FAILURE(status)) {
298 return (FALSE);
299 }
300
301 /*
302 * Check for all possible Fixed Events and dispatch those that are active
303 */
304 for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
305
306 /* Both the status and enable bits must be on for this event */
307
308 if ((in_status & acpi_gbl_fixed_event_info[i].status_bit_mask) &&
309 (in_enable & acpi_gbl_fixed_event_info[i].enable_bit_mask)) {
310 return (TRUE);
311 }
312 }
313
314 return (FALSE);
315 }
316
317 #endif /* !ACPI_REDUCED_HARDWARE */
318