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hwxfsleep.c
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linux-6.19.14/drivers/acpi/acpica/hwxfsleep.c
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 - 2025, 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 */ 19static acpi_status 20acpi_hw_set_firmware_waking_vector(struct acpi_table_facs *facs, 21 acpi_physical_address physical_address, 22 acpi_physical_address physical_address64); 23 24/******************************************************************************* 25 * 26 * FUNCTION: acpi_hw_set_firmware_waking_vector 27 * 28 * PARAMETERS: facs - Pointer to FACS table 29 * physical_address - 32-bit physical address of ACPI real mode 30 * entry point 31 * physical_address64 - 64-bit physical address of ACPI protected 32 * mode entry point 33 * 34 * RETURN: Status 35 * 36 * DESCRIPTION: Sets the firmware_waking_vector fields of the FACS 37 * 38 ******************************************************************************/ 39 40static acpi_status 41acpi_hw_set_firmware_waking_vector(struct acpi_table_facs *facs, 42 acpi_physical_address physical_address, 43 acpi_physical_address physical_address64) 44{ 45 ACPI_FUNCTION_TRACE(acpi_hw_set_firmware_waking_vector); 46 47 48 /* 49 * According to the ACPI specification 2.0c and later, the 64-bit 50 * waking vector should be cleared and the 32-bit waking vector should 51 * be used, unless we want the wake-up code to be called by the BIOS in 52 * Protected Mode. Some systems (for example HP dv5-1004nr) are known 53 * to fail to resume if the 64-bit vector is used. 54 */ 55 56 /* Set the 32-bit vector */ 57 58 facs->firmware_waking_vector = (u32)physical_address; 59 60 if (facs->length > 32) { 61 if (facs->version >= 1) { 62 63 /* Set the 64-bit vector */ 64 65 facs->xfirmware_waking_vector = physical_address64; 66 } else { 67 /* Clear the 64-bit vector if it exists */ 68 69 facs->xfirmware_waking_vector = 0; 70 } 71 } 72 73 return_ACPI_STATUS(AE_OK); 74} 75 76/******************************************************************************* 77 * 78 * FUNCTION: acpi_set_firmware_waking_vector 79 * 80 * PARAMETERS: physical_address - 32-bit physical address of ACPI real mode 81 * entry point 82 * physical_address64 - 64-bit physical address of ACPI protected 83 * mode entry point 84 * 85 * RETURN: Status 86 * 87 * DESCRIPTION: Sets the firmware_waking_vector fields of the FACS 88 * 89 ******************************************************************************/ 90 91acpi_status 92acpi_set_firmware_waking_vector(acpi_physical_address physical_address, 93 acpi_physical_address physical_address64) 94{ 95 96 ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector); 97 98 if (acpi_gbl_FACS) { 99 (void)acpi_hw_set_firmware_waking_vector(acpi_gbl_FACS, 100 physical_address, 101 physical_address64); 102 } 103 104 return_ACPI_STATUS(AE_OK); 105} 106 107ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector) 108 109/* 110 * These functions are removed for the ACPI_REDUCED_HARDWARE case: 111 * acpi_enter_sleep_state_s4bios 112 */ 113 114#if (!ACPI_REDUCED_HARDWARE) 115/******************************************************************************* 116 * 117 * FUNCTION: acpi_enter_sleep_state_s4bios 118 * 119 * PARAMETERS: None 120 * 121 * RETURN: Status 122 * 123 * DESCRIPTION: Perform a S4 bios request. 124 * THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED 125 * 126 ******************************************************************************/ 127acpi_status acpi_enter_sleep_state_s4bios(void) 128{ 129 u32 in_value; 130 acpi_status status; 131 132 ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_s4bios); 133 134 /* Clear the wake status bit (PM1) */ 135 136 status = 137 acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS); 138 if (ACPI_FAILURE(status)) { 139 return_ACPI_STATUS(status); 140 } 141 142 status = acpi_hw_clear_acpi_status(); 143 if (ACPI_FAILURE(status)) { 144 return_ACPI_STATUS(status); 145 } 146 147 /* 148 * 1) Disable all GPEs 149 * 2) Enable all wakeup GPEs 150 */ 151 status = acpi_hw_disable_all_gpes(); 152 if (ACPI_FAILURE(status)) { 153 return_ACPI_STATUS(status); 154 } 155 acpi_gbl_system_awake_and_running = FALSE; 156 157 status = acpi_hw_enable_all_wakeup_gpes(); 158 if (ACPI_FAILURE(status)) { 159 return_ACPI_STATUS(status); 160 } 161 162 status = acpi_hw_write_port(acpi_gbl_FADT.smi_command, 163 (u32)acpi_gbl_FADT.s4_bios_request, 8); 164 if (ACPI_FAILURE(status)) { 165 return_ACPI_STATUS(status); 166 } 167 168 do { 169 acpi_os_stall(ACPI_USEC_PER_MSEC); 170 status = 171 acpi_read_bit_register(ACPI_BITREG_WAKE_STATUS, &in_value); 172 if (ACPI_FAILURE(status)) { 173 return_ACPI_STATUS(status); 174 } 175 176 } while (!in_value); 177 178 return_ACPI_STATUS(AE_OK); 179} 180 181ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios) 182#endif /* !ACPI_REDUCED_HARDWARE */ 183 184/******************************************************************************* 185 * 186 * FUNCTION: acpi_enter_sleep_state_prep 187 * 188 * PARAMETERS: sleep_state - Which sleep state to enter 189 * 190 * RETURN: Status 191 * 192 * DESCRIPTION: Prepare to enter a system sleep state. 193 * This function must execute with interrupts enabled. 194 * We break sleeping into 2 stages so that OSPM can handle 195 * various OS-specific tasks between the two steps. 196 * 197 ******************************************************************************/ 198 199acpi_status acpi_enter_sleep_state_prep(u8 sleep_state) 200{ 201 acpi_status status; 202 struct acpi_object_list arg_list; 203 union acpi_object arg; 204 u32 sst_value; 205 206 ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_prep); 207 208 status = acpi_get_sleep_type_data(sleep_state, 209 &acpi_gbl_sleep_type_a, 210 &acpi_gbl_sleep_type_b); 211 if (ACPI_FAILURE(status)) { 212 return_ACPI_STATUS(status); 213 } 214 215 status = acpi_get_sleep_type_data(ACPI_STATE_S0, 216 &acpi_gbl_sleep_type_a_s0, 217 &acpi_gbl_sleep_type_b_s0); 218 if (ACPI_FAILURE(status)) { 219 acpi_gbl_sleep_type_a_s0 = ACPI_SLEEP_TYPE_INVALID; 220 } 221 222 /* Execute the _PTS method (Prepare To Sleep) */ 223 224 arg_list.count = 1; 225 arg_list.pointer = &arg; 226 arg.type = ACPI_TYPE_INTEGER; 227 arg.integer.value = sleep_state; 228 229 status = 230 acpi_evaluate_object(NULL, METHOD_PATHNAME__PTS, &arg_list, NULL); 231 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { 232 return_ACPI_STATUS(status); 233 } 234 235 /* Setup the argument to the _SST method (System STatus) */ 236 237 switch (sleep_state) { 238 case ACPI_STATE_S0: 239 240 sst_value = ACPI_SST_WORKING; 241 break; 242 243 case ACPI_STATE_S1: 244 case ACPI_STATE_S2: 245 case ACPI_STATE_S3: 246 247 sst_value = ACPI_SST_SLEEPING; 248 break; 249 250 case ACPI_STATE_S4: 251 252 sst_value = ACPI_SST_SLEEP_CONTEXT; 253 break; 254 255 default: 256 257 sst_value = ACPI_SST_INDICATOR_OFF; /* Default is off */ 258 break; 259 } 260 261 /* 262 * Set the system indicators to show the desired sleep state. 263 * _SST is an optional method (return no error if not found) 264 */ 265 acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, sst_value); 266 return_ACPI_STATUS(AE_OK); 267} 268 269ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep) 270 271/******************************************************************************* 272 * 273 * FUNCTION: acpi_enter_sleep_state 274 * 275 * PARAMETERS: sleep_state - Which sleep state to enter 276 * 277 * RETURN: Status 278 * 279 * DESCRIPTION: Enter a system sleep state 280 * THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED 281 * 282 ******************************************************************************/ 283acpi_status acpi_enter_sleep_state(u8 sleep_state) 284{ 285 acpi_status status; 286 287 ACPI_FUNCTION_TRACE(acpi_enter_sleep_state); 288 289 if ((acpi_gbl_sleep_type_a > ACPI_SLEEP_TYPE_MAX) || 290 (acpi_gbl_sleep_type_b > ACPI_SLEEP_TYPE_MAX)) { 291 ACPI_ERROR((AE_INFO, "Sleep values out of range: A=0x%X B=0x%X", 292 acpi_gbl_sleep_type_a, acpi_gbl_sleep_type_b)); 293 return_ACPI_STATUS(AE_AML_OPERAND_VALUE); 294 } 295 296#if !ACPI_REDUCED_HARDWARE 297 if (!acpi_gbl_reduced_hardware) 298 status = acpi_hw_legacy_sleep(sleep_state); 299 else 300#endif 301 status = acpi_hw_extended_sleep(sleep_state); 302 return_ACPI_STATUS(status); 303} 304 305ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state) 306 307/******************************************************************************* 308 * 309 * FUNCTION: acpi_leave_sleep_state_prep 310 * 311 * PARAMETERS: sleep_state - Which sleep state we are exiting 312 * 313 * RETURN: Status 314 * 315 * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a 316 * sleep. Called with interrupts DISABLED. 317 * We break wake/resume into 2 stages so that OSPM can handle 318 * various OS-specific tasks between the two steps. 319 * 320 ******************************************************************************/ 321acpi_status acpi_leave_sleep_state_prep(u8 sleep_state) 322{ 323 acpi_status status; 324 325 ACPI_FUNCTION_TRACE(acpi_leave_sleep_state_prep); 326 327#if !ACPI_REDUCED_HARDWARE 328 if (!acpi_gbl_reduced_hardware) 329 status = acpi_hw_legacy_wake_prep(sleep_state); 330 else 331#endif 332 status = acpi_hw_extended_wake_prep(sleep_state); 333 return_ACPI_STATUS(status); 334} 335 336ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state_prep) 337 338/******************************************************************************* 339 * 340 * FUNCTION: acpi_leave_sleep_state 341 * 342 * PARAMETERS: sleep_state - Which sleep state we are exiting 343 * 344 * RETURN: Status 345 * 346 * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep 347 * Called with interrupts ENABLED. 348 * 349 ******************************************************************************/ 350acpi_status acpi_leave_sleep_state(u8 sleep_state) 351{ 352 acpi_status status; 353 354 ACPI_FUNCTION_TRACE(acpi_leave_sleep_state); 355 356#if !ACPI_REDUCED_HARDWARE 357 if (!acpi_gbl_reduced_hardware) 358 status = acpi_hw_legacy_wake(sleep_state); 359 else 360#endif 361 status = acpi_hw_extended_wake(sleep_state); 362 return_ACPI_STATUS(status); 363} 364 365ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state)
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