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1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2/******************************************************************************
3 *
4 * Name: hwxfsleep.c - ACPI Hardware Sleep/Wake External Interfaces
5 *
6 * Copyright (C) 2000 - 2019, Intel Corp.
7 *
8 *****************************************************************************/
9
10#define EXPORT_ACPI_INTERFACES
11
12#include <acpi/acpi.h>
13#include "accommon.h"
14
15#define _COMPONENT ACPI_HARDWARE
16ACPI_MODULE_NAME("hwxfsleep")
17
18/* Local prototypes */
19#if (!ACPI_REDUCED_HARDWARE)
20static acpi_status
21acpi_hw_set_firmware_waking_vector(struct acpi_table_facs *facs,
22 acpi_physical_address physical_address,
23 acpi_physical_address physical_address64);
24#endif
25
26/*
27 * These functions are removed for the ACPI_REDUCED_HARDWARE case:
28 * acpi_set_firmware_waking_vector
29 * acpi_enter_sleep_state_s4bios
30 */
31
32#if (!ACPI_REDUCED_HARDWARE)
33/*******************************************************************************
34 *
35 * FUNCTION: acpi_hw_set_firmware_waking_vector
36 *
37 * PARAMETERS: facs - Pointer to FACS table
38 * physical_address - 32-bit physical address of ACPI real mode
39 * entry point
40 * physical_address64 - 64-bit physical address of ACPI protected
41 * mode entry point
42 *
43 * RETURN: Status
44 *
45 * DESCRIPTION: Sets the firmware_waking_vector fields of the FACS
46 *
47 ******************************************************************************/
48
49static acpi_status
50acpi_hw_set_firmware_waking_vector(struct acpi_table_facs *facs,
51 acpi_physical_address physical_address,
52 acpi_physical_address physical_address64)
53{
54 ACPI_FUNCTION_TRACE(acpi_hw_set_firmware_waking_vector);
55
56
57 /*
58 * According to the ACPI specification 2.0c and later, the 64-bit
59 * waking vector should be cleared and the 32-bit waking vector should
60 * be used, unless we want the wake-up code to be called by the BIOS in
61 * Protected Mode. Some systems (for example HP dv5-1004nr) are known
62 * to fail to resume if the 64-bit vector is used.
63 */
64
65 /* Set the 32-bit vector */
66
67 facs->firmware_waking_vector = (u32)physical_address;
68
69 if (facs->length > 32) {
70 if (facs->version >= 1) {
71
72 /* Set the 64-bit vector */
73
74 facs->xfirmware_waking_vector = physical_address64;
75 } else {
76 /* Clear the 64-bit vector if it exists */
77
78 facs->xfirmware_waking_vector = 0;
79 }
80 }
81
82 return_ACPI_STATUS(AE_OK);
83}
84
85/*******************************************************************************
86 *
87 * FUNCTION: acpi_set_firmware_waking_vector
88 *
89 * PARAMETERS: physical_address - 32-bit physical address of ACPI real mode
90 * entry point
91 * physical_address64 - 64-bit physical address of ACPI protected
92 * mode entry point
93 *
94 * RETURN: Status
95 *
96 * DESCRIPTION: Sets the firmware_waking_vector fields of the FACS
97 *
98 ******************************************************************************/
99
100acpi_status
101acpi_set_firmware_waking_vector(acpi_physical_address physical_address,
102 acpi_physical_address physical_address64)
103{
104
105 ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector);
106
107 if (acpi_gbl_FACS) {
108 (void)acpi_hw_set_firmware_waking_vector(acpi_gbl_FACS,
109 physical_address,
110 physical_address64);
111 }
112
113 return_ACPI_STATUS(AE_OK);
114}
115
116ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector)
117
118/*******************************************************************************
119 *
120 * FUNCTION: acpi_enter_sleep_state_s4bios
121 *
122 * PARAMETERS: None
123 *
124 * RETURN: Status
125 *
126 * DESCRIPTION: Perform a S4 bios request.
127 * THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
128 *
129 ******************************************************************************/
130acpi_status acpi_enter_sleep_state_s4bios(void)
131{
132 u32 in_value;
133 acpi_status status;
134
135 ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_s4bios);
136
137 /* Clear the wake status bit (PM1) */
138
139 status =
140 acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS);
141 if (ACPI_FAILURE(status)) {
142 return_ACPI_STATUS(status);
143 }
144
145 status = acpi_hw_clear_acpi_status();
146 if (ACPI_FAILURE(status)) {
147 return_ACPI_STATUS(status);
148 }
149
150 /*
151 * 1) Disable all GPEs
152 * 2) Enable all wakeup GPEs
153 */
154 status = acpi_hw_disable_all_gpes();
155 if (ACPI_FAILURE(status)) {
156 return_ACPI_STATUS(status);
157 }
158 acpi_gbl_system_awake_and_running = FALSE;
159
160 status = acpi_hw_enable_all_wakeup_gpes();
161 if (ACPI_FAILURE(status)) {
162 return_ACPI_STATUS(status);
163 }
164
165 ACPI_FLUSH_CPU_CACHE();
166
167 status = acpi_hw_write_port(acpi_gbl_FADT.smi_command,
168 (u32)acpi_gbl_FADT.s4_bios_request, 8);
169
170 do {
171 acpi_os_stall(ACPI_USEC_PER_MSEC);
172 status =
173 acpi_read_bit_register(ACPI_BITREG_WAKE_STATUS, &in_value);
174 if (ACPI_FAILURE(status)) {
175 return_ACPI_STATUS(status);
176 }
177
178 } while (!in_value);
179
180 return_ACPI_STATUS(AE_OK);
181}
182
183ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios)
184#endif /* !ACPI_REDUCED_HARDWARE */
185
186/*******************************************************************************
187 *
188 * FUNCTION: acpi_enter_sleep_state_prep
189 *
190 * PARAMETERS: sleep_state - Which sleep state to enter
191 *
192 * RETURN: Status
193 *
194 * DESCRIPTION: Prepare to enter a system sleep state.
195 * This function must execute with interrupts enabled.
196 * We break sleeping into 2 stages so that OSPM can handle
197 * various OS-specific tasks between the two steps.
198 *
199 ******************************************************************************/
200
201acpi_status acpi_enter_sleep_state_prep(u8 sleep_state)
202{
203 acpi_status status;
204 struct acpi_object_list arg_list;
205 union acpi_object arg;
206 u32 sst_value;
207
208 ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_prep);
209
210 status = acpi_get_sleep_type_data(sleep_state,
211 &acpi_gbl_sleep_type_a,
212 &acpi_gbl_sleep_type_b);
213 if (ACPI_FAILURE(status)) {
214 return_ACPI_STATUS(status);
215 }
216
217 /* Execute the _PTS method (Prepare To Sleep) */
218
219 arg_list.count = 1;
220 arg_list.pointer = &arg;
221 arg.type = ACPI_TYPE_INTEGER;
222 arg.integer.value = sleep_state;
223
224 status =
225 acpi_evaluate_object(NULL, METHOD_PATHNAME__PTS, &arg_list, NULL);
226 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
227 return_ACPI_STATUS(status);
228 }
229
230 /* Setup the argument to the _SST method (System STatus) */
231
232 switch (sleep_state) {
233 case ACPI_STATE_S0:
234
235 sst_value = ACPI_SST_WORKING;
236 break;
237
238 case ACPI_STATE_S1:
239 case ACPI_STATE_S2:
240 case ACPI_STATE_S3:
241
242 sst_value = ACPI_SST_SLEEPING;
243 break;
244
245 case ACPI_STATE_S4:
246
247 sst_value = ACPI_SST_SLEEP_CONTEXT;
248 break;
249
250 default:
251
252 sst_value = ACPI_SST_INDICATOR_OFF; /* Default is off */
253 break;
254 }
255
256 /*
257 * Set the system indicators to show the desired sleep state.
258 * _SST is an optional method (return no error if not found)
259 */
260 acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, sst_value);
261 return_ACPI_STATUS(AE_OK);
262}
263
264ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep)
265
266/*******************************************************************************
267 *
268 * FUNCTION: acpi_enter_sleep_state
269 *
270 * PARAMETERS: sleep_state - Which sleep state to enter
271 *
272 * RETURN: Status
273 *
274 * DESCRIPTION: Enter a system sleep state
275 * THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
276 *
277 ******************************************************************************/
278acpi_status acpi_enter_sleep_state(u8 sleep_state)
279{
280 acpi_status status;
281
282 ACPI_FUNCTION_TRACE(acpi_enter_sleep_state);
283
284 if ((acpi_gbl_sleep_type_a > ACPI_SLEEP_TYPE_MAX) ||
285 (acpi_gbl_sleep_type_b > ACPI_SLEEP_TYPE_MAX)) {
286 ACPI_ERROR((AE_INFO, "Sleep values out of range: A=0x%X B=0x%X",
287 acpi_gbl_sleep_type_a, acpi_gbl_sleep_type_b));
288 return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
289 }
290
291#if !ACPI_REDUCED_HARDWARE
292 if (!acpi_gbl_reduced_hardware)
293 status = acpi_hw_legacy_sleep(sleep_state);
294 else
295#endif
296 status = acpi_hw_extended_sleep(sleep_state);
297 return_ACPI_STATUS(status);
298}
299
300ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state)
301
302/*******************************************************************************
303 *
304 * FUNCTION: acpi_leave_sleep_state_prep
305 *
306 * PARAMETERS: sleep_state - Which sleep state we are exiting
307 *
308 * RETURN: Status
309 *
310 * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a
311 * sleep. Called with interrupts DISABLED.
312 * We break wake/resume into 2 stages so that OSPM can handle
313 * various OS-specific tasks between the two steps.
314 *
315 ******************************************************************************/
316acpi_status acpi_leave_sleep_state_prep(u8 sleep_state)
317{
318 acpi_status status;
319
320 ACPI_FUNCTION_TRACE(acpi_leave_sleep_state_prep);
321
322#if !ACPI_REDUCED_HARDWARE
323 if (!acpi_gbl_reduced_hardware)
324 status = acpi_hw_legacy_wake_prep(sleep_state);
325 else
326#endif
327 status = acpi_hw_extended_wake_prep(sleep_state);
328 return_ACPI_STATUS(status);
329}
330
331ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state_prep)
332
333/*******************************************************************************
334 *
335 * FUNCTION: acpi_leave_sleep_state
336 *
337 * PARAMETERS: sleep_state - Which sleep state we are exiting
338 *
339 * RETURN: Status
340 *
341 * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
342 * Called with interrupts ENABLED.
343 *
344 ******************************************************************************/
345acpi_status acpi_leave_sleep_state(u8 sleep_state)
346{
347 acpi_status status;
348
349 ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
350
351#if !ACPI_REDUCED_HARDWARE
352 if (!acpi_gbl_reduced_hardware)
353 status = acpi_hw_legacy_wake(sleep_state);
354 else
355#endif
356 status = acpi_hw_extended_wake(sleep_state);
357 return_ACPI_STATUS(status);
358}
359
360ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state)