1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 2 /****************************************************************************** 3 * 4 * Name: hwsleep.c - ACPI Hardware Sleep/Wake Support functions for the 5 * original/legacy sleep/PM registers. 6 * 7 * Copyright (C) 2000 - 2021, Intel Corp. 8 * 9 *****************************************************************************/ 10 11 #include <acpi/acpi.h> 12 #include "accommon.h" 13 14 #define _COMPONENT ACPI_HARDWARE 15 ACPI_MODULE_NAME("hwsleep") 16 17 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */ 18 /******************************************************************************* 19 * 20 * FUNCTION: acpi_hw_legacy_sleep 21 * 22 * PARAMETERS: sleep_state - Which sleep state to enter 23 * 24 * RETURN: Status 25 * 26 * DESCRIPTION: Enter a system sleep state via the legacy FADT PM registers 27 * THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED 28 * 29 ******************************************************************************/ 30 acpi_status acpi_hw_legacy_sleep(u8 sleep_state) 31 { 32 struct acpi_bit_register_info *sleep_type_reg_info; 33 struct acpi_bit_register_info *sleep_enable_reg_info; 34 u32 pm1a_control; 35 u32 pm1b_control; 36 u32 in_value; 37 acpi_status status; 38 39 ACPI_FUNCTION_TRACE(hw_legacy_sleep); 40 41 sleep_type_reg_info = 42 acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE); 43 sleep_enable_reg_info = 44 acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE); 45 46 /* Clear wake status */ 47 48 status = acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS, 49 ACPI_CLEAR_STATUS); 50 if (ACPI_FAILURE(status)) { 51 return_ACPI_STATUS(status); 52 } 53 54 /* Disable all GPEs */ 55 status = acpi_hw_disable_all_gpes(); 56 if (ACPI_FAILURE(status)) { 57 return_ACPI_STATUS(status); 58 } 59 status = acpi_hw_clear_acpi_status(); 60 if (ACPI_FAILURE(status)) { 61 return_ACPI_STATUS(status); 62 } 63 acpi_gbl_system_awake_and_running = FALSE; 64 65 /* Enable all wakeup GPEs */ 66 status = acpi_hw_enable_all_wakeup_gpes(); 67 if (ACPI_FAILURE(status)) { 68 return_ACPI_STATUS(status); 69 } 70 71 /* Get current value of PM1A control */ 72 73 status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL, 74 &pm1a_control); 75 if (ACPI_FAILURE(status)) { 76 return_ACPI_STATUS(status); 77 } 78 ACPI_DEBUG_PRINT((ACPI_DB_INIT, 79 "Entering sleep state [S%u]\n", sleep_state)); 80 81 /* Clear the SLP_EN and SLP_TYP fields */ 82 83 pm1a_control &= ~(sleep_type_reg_info->access_bit_mask | 84 sleep_enable_reg_info->access_bit_mask); 85 pm1b_control = pm1a_control; 86 87 /* Insert the SLP_TYP bits */ 88 89 pm1a_control |= 90 (acpi_gbl_sleep_type_a << sleep_type_reg_info->bit_position); 91 pm1b_control |= 92 (acpi_gbl_sleep_type_b << sleep_type_reg_info->bit_position); 93 94 /* 95 * We split the writes of SLP_TYP and SLP_EN to workaround 96 * poorly implemented hardware. 97 */ 98 99 /* Write #1: write the SLP_TYP data to the PM1 Control registers */ 100 101 status = acpi_hw_write_pm1_control(pm1a_control, pm1b_control); 102 if (ACPI_FAILURE(status)) { 103 return_ACPI_STATUS(status); 104 } 105 106 /* Insert the sleep enable (SLP_EN) bit */ 107 108 pm1a_control |= sleep_enable_reg_info->access_bit_mask; 109 pm1b_control |= sleep_enable_reg_info->access_bit_mask; 110 111 /* Flush caches, as per ACPI specification */ 112 113 if (sleep_state < ACPI_STATE_S4) { 114 ACPI_FLUSH_CPU_CACHE(); 115 } 116 117 status = acpi_os_enter_sleep(sleep_state, pm1a_control, pm1b_control); 118 if (status == AE_CTRL_TERMINATE) { 119 return_ACPI_STATUS(AE_OK); 120 } 121 if (ACPI_FAILURE(status)) { 122 return_ACPI_STATUS(status); 123 } 124 125 /* Write #2: Write both SLP_TYP + SLP_EN */ 126 127 status = acpi_hw_write_pm1_control(pm1a_control, pm1b_control); 128 if (ACPI_FAILURE(status)) { 129 return_ACPI_STATUS(status); 130 } 131 132 if (sleep_state > ACPI_STATE_S3) { 133 /* 134 * We wanted to sleep > S3, but it didn't happen (by virtue of the 135 * fact that we are still executing!) 136 * 137 * Wait ten seconds, then try again. This is to get S4/S5 to work on 138 * all machines. 139 * 140 * We wait so long to allow chipsets that poll this reg very slowly 141 * to still read the right value. Ideally, this block would go 142 * away entirely. 143 */ 144 acpi_os_stall(10 * ACPI_USEC_PER_SEC); 145 146 status = acpi_hw_register_write(ACPI_REGISTER_PM1_CONTROL, 147 sleep_enable_reg_info-> 148 access_bit_mask); 149 if (ACPI_FAILURE(status)) { 150 return_ACPI_STATUS(status); 151 } 152 } 153 154 /* Wait for transition back to Working State */ 155 156 do { 157 status = 158 acpi_read_bit_register(ACPI_BITREG_WAKE_STATUS, &in_value); 159 if (ACPI_FAILURE(status)) { 160 return_ACPI_STATUS(status); 161 } 162 163 } while (!in_value); 164 165 return_ACPI_STATUS(AE_OK); 166 } 167 168 /******************************************************************************* 169 * 170 * FUNCTION: acpi_hw_legacy_wake_prep 171 * 172 * PARAMETERS: sleep_state - Which sleep state we just exited 173 * 174 * RETURN: Status 175 * 176 * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a 177 * sleep. 178 * Called with interrupts ENABLED. 179 * 180 ******************************************************************************/ 181 182 acpi_status acpi_hw_legacy_wake_prep(u8 sleep_state) 183 { 184 acpi_status status = AE_OK; 185 struct acpi_bit_register_info *sleep_type_reg_info; 186 struct acpi_bit_register_info *sleep_enable_reg_info; 187 u32 pm1a_control; 188 u32 pm1b_control; 189 190 ACPI_FUNCTION_TRACE(hw_legacy_wake_prep); 191 192 /* 193 * Set SLP_TYPE and SLP_EN to state S0. 194 * This is unclear from the ACPI Spec, but it is required 195 * by some machines. 196 */ 197 if (acpi_gbl_sleep_type_a_s0 != ACPI_SLEEP_TYPE_INVALID) { 198 sleep_type_reg_info = 199 acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE); 200 sleep_enable_reg_info = 201 acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE); 202 203 /* Get current value of PM1A control */ 204 205 status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL, 206 &pm1a_control); 207 if (ACPI_SUCCESS(status)) { 208 209 /* Clear the SLP_EN and SLP_TYP fields */ 210 211 pm1a_control &= ~(sleep_type_reg_info->access_bit_mask | 212 sleep_enable_reg_info-> 213 access_bit_mask); 214 pm1b_control = pm1a_control; 215 216 /* Insert the SLP_TYP bits */ 217 218 pm1a_control |= (acpi_gbl_sleep_type_a_s0 << 219 sleep_type_reg_info->bit_position); 220 pm1b_control |= (acpi_gbl_sleep_type_b_s0 << 221 sleep_type_reg_info->bit_position); 222 223 /* Write the control registers and ignore any errors */ 224 225 (void)acpi_hw_write_pm1_control(pm1a_control, 226 pm1b_control); 227 } 228 } 229 230 return_ACPI_STATUS(status); 231 } 232 233 /******************************************************************************* 234 * 235 * FUNCTION: acpi_hw_legacy_wake 236 * 237 * PARAMETERS: sleep_state - Which sleep state we just exited 238 * 239 * RETURN: Status 240 * 241 * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep 242 * Called with interrupts ENABLED. 243 * 244 ******************************************************************************/ 245 246 acpi_status acpi_hw_legacy_wake(u8 sleep_state) 247 { 248 acpi_status status; 249 250 ACPI_FUNCTION_TRACE(hw_legacy_wake); 251 252 /* Ensure enter_sleep_state_prep -> enter_sleep_state ordering */ 253 254 acpi_gbl_sleep_type_a = ACPI_SLEEP_TYPE_INVALID; 255 acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, ACPI_SST_WAKING); 256 257 /* 258 * GPEs must be enabled before _WAK is called as GPEs 259 * might get fired there 260 * 261 * Restore the GPEs: 262 * 1) Disable all GPEs 263 * 2) Enable all runtime GPEs 264 */ 265 status = acpi_hw_disable_all_gpes(); 266 if (ACPI_FAILURE(status)) { 267 return_ACPI_STATUS(status); 268 } 269 270 status = acpi_hw_enable_all_runtime_gpes(); 271 if (ACPI_FAILURE(status)) { 272 return_ACPI_STATUS(status); 273 } 274 275 /* 276 * Now we can execute _WAK, etc. Some machines require that the GPEs 277 * are enabled before the wake methods are executed. 278 */ 279 acpi_hw_execute_sleep_method(METHOD_PATHNAME__WAK, sleep_state); 280 281 /* 282 * Some BIOS code assumes that WAK_STS will be cleared on resume 283 * and use it to determine whether the system is rebooting or 284 * resuming. Clear WAK_STS for compatibility. 285 */ 286 (void)acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS, 287 ACPI_CLEAR_STATUS); 288 acpi_gbl_system_awake_and_running = TRUE; 289 290 /* Enable power button */ 291 292 (void) 293 acpi_write_bit_register(acpi_gbl_fixed_event_info 294 [ACPI_EVENT_POWER_BUTTON]. 295 enable_register_id, ACPI_ENABLE_EVENT); 296 297 (void) 298 acpi_write_bit_register(acpi_gbl_fixed_event_info 299 [ACPI_EVENT_POWER_BUTTON]. 300 status_register_id, ACPI_CLEAR_STATUS); 301 302 /* Enable sleep button */ 303 304 (void) 305 acpi_write_bit_register(acpi_gbl_fixed_event_info 306 [ACPI_EVENT_SLEEP_BUTTON]. 307 enable_register_id, ACPI_ENABLE_EVENT); 308 309 (void) 310 acpi_write_bit_register(acpi_gbl_fixed_event_info 311 [ACPI_EVENT_SLEEP_BUTTON]. 312 status_register_id, ACPI_CLEAR_STATUS); 313 314 acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, ACPI_SST_WORKING); 315 return_ACPI_STATUS(status); 316 } 317 318 #endif /* !ACPI_REDUCED_HARDWARE */ 319