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 - 2020, 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
16 ACPI_MODULE_NAME("hwxfsleep")
17
18 /* Local prototypes */
19 #if (!ACPI_REDUCED_HARDWARE)
20 static acpi_status
21 acpi_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
49 static acpi_status
acpi_hw_set_firmware_waking_vector(struct acpi_table_facs * facs,acpi_physical_address physical_address,acpi_physical_address physical_address64)50 acpi_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
100 acpi_status
acpi_set_firmware_waking_vector(acpi_physical_address physical_address,acpi_physical_address physical_address64)101 acpi_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
ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector)116 ACPI_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 ******************************************************************************/
130 acpi_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 status = acpi_hw_write_port(acpi_gbl_FADT.smi_command,
166 (u32)acpi_gbl_FADT.s4_bios_request, 8);
167 if (ACPI_FAILURE(status)) {
168 return_ACPI_STATUS(status);
169 }
170
171 do {
172 acpi_os_stall(ACPI_USEC_PER_MSEC);
173 status =
174 acpi_read_bit_register(ACPI_BITREG_WAKE_STATUS, &in_value);
175 if (ACPI_FAILURE(status)) {
176 return_ACPI_STATUS(status);
177 }
178
179 } while (!in_value);
180
181 return_ACPI_STATUS(AE_OK);
182 }
183
ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios)184 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios)
185 #endif /* !ACPI_REDUCED_HARDWARE */
186
187 /*******************************************************************************
188 *
189 * FUNCTION: acpi_enter_sleep_state_prep
190 *
191 * PARAMETERS: sleep_state - Which sleep state to enter
192 *
193 * RETURN: Status
194 *
195 * DESCRIPTION: Prepare to enter a system sleep state.
196 * This function must execute with interrupts enabled.
197 * We break sleeping into 2 stages so that OSPM can handle
198 * various OS-specific tasks between the two steps.
199 *
200 ******************************************************************************/
201
202 acpi_status acpi_enter_sleep_state_prep(u8 sleep_state)
203 {
204 acpi_status status;
205 struct acpi_object_list arg_list;
206 union acpi_object arg;
207 u32 sst_value;
208
209 ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_prep);
210
211 status = acpi_get_sleep_type_data(sleep_state,
212 &acpi_gbl_sleep_type_a,
213 &acpi_gbl_sleep_type_b);
214 if (ACPI_FAILURE(status)) {
215 return_ACPI_STATUS(status);
216 }
217
218 status = acpi_get_sleep_type_data(ACPI_STATE_S0,
219 &acpi_gbl_sleep_type_a_s0,
220 &acpi_gbl_sleep_type_b_s0);
221 if (ACPI_FAILURE(status)) {
222 acpi_gbl_sleep_type_a_s0 = ACPI_SLEEP_TYPE_INVALID;
223 }
224
225 /* Execute the _PTS method (Prepare To Sleep) */
226
227 arg_list.count = 1;
228 arg_list.pointer = &arg;
229 arg.type = ACPI_TYPE_INTEGER;
230 arg.integer.value = sleep_state;
231
232 status =
233 acpi_evaluate_object(NULL, METHOD_PATHNAME__PTS, &arg_list, NULL);
234 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
235 return_ACPI_STATUS(status);
236 }
237
238 /* Setup the argument to the _SST method (System STatus) */
239
240 switch (sleep_state) {
241 case ACPI_STATE_S0:
242
243 sst_value = ACPI_SST_WORKING;
244 break;
245
246 case ACPI_STATE_S1:
247 case ACPI_STATE_S2:
248 case ACPI_STATE_S3:
249
250 sst_value = ACPI_SST_SLEEPING;
251 break;
252
253 case ACPI_STATE_S4:
254
255 sst_value = ACPI_SST_SLEEP_CONTEXT;
256 break;
257
258 default:
259
260 sst_value = ACPI_SST_INDICATOR_OFF; /* Default is off */
261 break;
262 }
263
264 /*
265 * Set the system indicators to show the desired sleep state.
266 * _SST is an optional method (return no error if not found)
267 */
268 acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, sst_value);
269 return_ACPI_STATUS(AE_OK);
270 }
271
ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep)272 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep)
273
274 /*******************************************************************************
275 *
276 * FUNCTION: acpi_enter_sleep_state
277 *
278 * PARAMETERS: sleep_state - Which sleep state to enter
279 *
280 * RETURN: Status
281 *
282 * DESCRIPTION: Enter a system sleep state
283 * THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
284 *
285 ******************************************************************************/
286 acpi_status acpi_enter_sleep_state(u8 sleep_state)
287 {
288 acpi_status status;
289
290 ACPI_FUNCTION_TRACE(acpi_enter_sleep_state);
291
292 if ((acpi_gbl_sleep_type_a > ACPI_SLEEP_TYPE_MAX) ||
293 (acpi_gbl_sleep_type_b > ACPI_SLEEP_TYPE_MAX)) {
294 ACPI_ERROR((AE_INFO, "Sleep values out of range: A=0x%X B=0x%X",
295 acpi_gbl_sleep_type_a, acpi_gbl_sleep_type_b));
296 return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
297 }
298
299 #if !ACPI_REDUCED_HARDWARE
300 if (!acpi_gbl_reduced_hardware)
301 status = acpi_hw_legacy_sleep(sleep_state);
302 else
303 #endif
304 status = acpi_hw_extended_sleep(sleep_state);
305 return_ACPI_STATUS(status);
306 }
307
ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state)308 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state)
309
310 /*******************************************************************************
311 *
312 * FUNCTION: acpi_leave_sleep_state_prep
313 *
314 * PARAMETERS: sleep_state - Which sleep state we are exiting
315 *
316 * RETURN: Status
317 *
318 * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a
319 * sleep. Called with interrupts DISABLED.
320 * We break wake/resume into 2 stages so that OSPM can handle
321 * various OS-specific tasks between the two steps.
322 *
323 ******************************************************************************/
324 acpi_status acpi_leave_sleep_state_prep(u8 sleep_state)
325 {
326 acpi_status status;
327
328 ACPI_FUNCTION_TRACE(acpi_leave_sleep_state_prep);
329
330 #if !ACPI_REDUCED_HARDWARE
331 if (!acpi_gbl_reduced_hardware)
332 status = acpi_hw_legacy_wake_prep(sleep_state);
333 else
334 #endif
335 status = acpi_hw_extended_wake_prep(sleep_state);
336 return_ACPI_STATUS(status);
337 }
338
ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state_prep)339 ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state_prep)
340
341 /*******************************************************************************
342 *
343 * FUNCTION: acpi_leave_sleep_state
344 *
345 * PARAMETERS: sleep_state - Which sleep state we are exiting
346 *
347 * RETURN: Status
348 *
349 * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
350 * Called with interrupts ENABLED.
351 *
352 ******************************************************************************/
353 acpi_status acpi_leave_sleep_state(u8 sleep_state)
354 {
355 acpi_status status;
356
357 ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
358
359 #if !ACPI_REDUCED_HARDWARE
360 if (!acpi_gbl_reduced_hardware)
361 status = acpi_hw_legacy_wake(sleep_state);
362 else
363 #endif
364 status = acpi_hw_extended_wake(sleep_state);
365 return_ACPI_STATUS(status);
366 }
367
368 ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state)
369