1 /******************************************************************************
3 * Name: hwsleep.c - ACPI Hardware Sleep/Wake Support functions for the
4 * original/legacy sleep/PM registers.
6 *****************************************************************************/
9 * Copyright (C) 2000 - 2017, Intel Corp.
10 * All rights reserved.
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25 * from this software without specific prior written permission.
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45 #include <acpi/acpi.h>
48 #define _COMPONENT ACPI_HARDWARE
49 ACPI_MODULE_NAME("hwsleep")
51 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */
52 /*******************************************************************************
54 * FUNCTION: acpi_hw_legacy_sleep
56 * PARAMETERS: sleep_state - Which sleep state to enter
60 * DESCRIPTION: Enter a system sleep state via the legacy FADT PM registers
61 * THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
63 ******************************************************************************/
64 acpi_status acpi_hw_legacy_sleep(u8 sleep_state)
66 struct acpi_bit_register_info *sleep_type_reg_info;
67 struct acpi_bit_register_info *sleep_enable_reg_info;
73 ACPI_FUNCTION_TRACE(hw_legacy_sleep);
76 acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE);
77 sleep_enable_reg_info =
78 acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE);
80 /* Clear wake status */
82 status = acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS,
84 if (ACPI_FAILURE(status)) {
85 return_ACPI_STATUS(status);
88 /* Clear all fixed and general purpose status bits */
90 status = acpi_hw_clear_acpi_status();
91 if (ACPI_FAILURE(status)) {
92 return_ACPI_STATUS(status);
96 * 1) Disable/Clear all GPEs
97 * 2) Enable all wakeup GPEs
99 status = acpi_hw_disable_all_gpes();
100 if (ACPI_FAILURE(status)) {
101 return_ACPI_STATUS(status);
103 acpi_gbl_system_awake_and_running = FALSE;
105 status = acpi_hw_enable_all_wakeup_gpes();
106 if (ACPI_FAILURE(status)) {
107 return_ACPI_STATUS(status);
110 /* Get current value of PM1A control */
112 status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL,
114 if (ACPI_FAILURE(status)) {
115 return_ACPI_STATUS(status);
117 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
118 "Entering sleep state [S%u]\n", sleep_state));
120 /* Clear the SLP_EN and SLP_TYP fields */
122 pm1a_control &= ~(sleep_type_reg_info->access_bit_mask |
123 sleep_enable_reg_info->access_bit_mask);
124 pm1b_control = pm1a_control;
126 /* Insert the SLP_TYP bits */
129 (acpi_gbl_sleep_type_a << sleep_type_reg_info->bit_position);
131 (acpi_gbl_sleep_type_b << sleep_type_reg_info->bit_position);
134 * We split the writes of SLP_TYP and SLP_EN to workaround
135 * poorly implemented hardware.
138 /* Write #1: write the SLP_TYP data to the PM1 Control registers */
140 status = acpi_hw_write_pm1_control(pm1a_control, pm1b_control);
141 if (ACPI_FAILURE(status)) {
142 return_ACPI_STATUS(status);
145 /* Insert the sleep enable (SLP_EN) bit */
147 pm1a_control |= sleep_enable_reg_info->access_bit_mask;
148 pm1b_control |= sleep_enable_reg_info->access_bit_mask;
150 /* Flush caches, as per ACPI specification */
152 if (sleep_state < ACPI_STATE_S4) {
153 ACPI_FLUSH_CPU_CACHE();
156 status = acpi_os_enter_sleep(sleep_state, pm1a_control, pm1b_control);
157 if (status == AE_CTRL_TERMINATE) {
158 return_ACPI_STATUS(AE_OK);
160 if (ACPI_FAILURE(status)) {
161 return_ACPI_STATUS(status);
164 /* Write #2: Write both SLP_TYP + SLP_EN */
166 status = acpi_hw_write_pm1_control(pm1a_control, pm1b_control);
167 if (ACPI_FAILURE(status)) {
168 return_ACPI_STATUS(status);
171 if (sleep_state > ACPI_STATE_S3) {
173 * We wanted to sleep > S3, but it didn't happen (by virtue of the
174 * fact that we are still executing!)
176 * Wait ten seconds, then try again. This is to get S4/S5 to work on
179 * We wait so long to allow chipsets that poll this reg very slowly
180 * to still read the right value. Ideally, this block would go
183 acpi_os_stall(10 * ACPI_USEC_PER_SEC);
185 status = acpi_hw_register_write(ACPI_REGISTER_PM1_CONTROL,
186 sleep_enable_reg_info->
188 if (ACPI_FAILURE(status)) {
189 return_ACPI_STATUS(status);
193 /* Wait for transition back to Working State */
197 acpi_read_bit_register(ACPI_BITREG_WAKE_STATUS, &in_value);
198 if (ACPI_FAILURE(status)) {
199 return_ACPI_STATUS(status);
204 return_ACPI_STATUS(AE_OK);
207 /*******************************************************************************
209 * FUNCTION: acpi_hw_legacy_wake_prep
211 * PARAMETERS: sleep_state - Which sleep state we just exited
215 * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a
217 * Called with interrupts ENABLED.
219 ******************************************************************************/
221 acpi_status acpi_hw_legacy_wake_prep(u8 sleep_state)
223 acpi_status status = AE_OK;
224 struct acpi_bit_register_info *sleep_type_reg_info;
225 struct acpi_bit_register_info *sleep_enable_reg_info;
229 ACPI_FUNCTION_TRACE(hw_legacy_wake_prep);
232 * Set SLP_TYPE and SLP_EN to state S0.
233 * This is unclear from the ACPI Spec, but it is required
236 if (acpi_gbl_sleep_type_a_s0 != ACPI_SLEEP_TYPE_INVALID) {
237 sleep_type_reg_info =
238 acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE);
239 sleep_enable_reg_info =
240 acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_ENABLE);
242 /* Get current value of PM1A control */
244 status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL,
246 if (ACPI_SUCCESS(status)) {
248 /* Clear the SLP_EN and SLP_TYP fields */
250 pm1a_control &= ~(sleep_type_reg_info->access_bit_mask |
251 sleep_enable_reg_info->
253 pm1b_control = pm1a_control;
255 /* Insert the SLP_TYP bits */
257 pm1a_control |= (acpi_gbl_sleep_type_a_s0 <<
258 sleep_type_reg_info->bit_position);
259 pm1b_control |= (acpi_gbl_sleep_type_b_s0 <<
260 sleep_type_reg_info->bit_position);
262 /* Write the control registers and ignore any errors */
264 (void)acpi_hw_write_pm1_control(pm1a_control,
269 return_ACPI_STATUS(status);
272 /*******************************************************************************
274 * FUNCTION: acpi_hw_legacy_wake
276 * PARAMETERS: sleep_state - Which sleep state we just exited
280 * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
281 * Called with interrupts ENABLED.
283 ******************************************************************************/
285 acpi_status acpi_hw_legacy_wake(u8 sleep_state)
289 ACPI_FUNCTION_TRACE(hw_legacy_wake);
291 /* Ensure enter_sleep_state_prep -> enter_sleep_state ordering */
293 acpi_gbl_sleep_type_a = ACPI_SLEEP_TYPE_INVALID;
294 acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, ACPI_SST_WAKING);
297 * GPEs must be enabled before _WAK is called as GPEs
298 * might get fired there
301 * 1) Disable/Clear all GPEs
302 * 2) Enable all runtime GPEs
304 status = acpi_hw_disable_all_gpes();
305 if (ACPI_FAILURE(status)) {
306 return_ACPI_STATUS(status);
309 status = acpi_hw_enable_all_runtime_gpes();
310 if (ACPI_FAILURE(status)) {
311 return_ACPI_STATUS(status);
315 * Now we can execute _WAK, etc. Some machines require that the GPEs
316 * are enabled before the wake methods are executed.
318 acpi_hw_execute_sleep_method(METHOD_PATHNAME__WAK, sleep_state);
321 * Some BIOS code assumes that WAK_STS will be cleared on resume
322 * and use it to determine whether the system is rebooting or
323 * resuming. Clear WAK_STS for compatibility.
325 (void)acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS,
327 acpi_gbl_system_awake_and_running = TRUE;
329 /* Enable power button */
332 acpi_write_bit_register(acpi_gbl_fixed_event_info
333 [ACPI_EVENT_POWER_BUTTON].
334 enable_register_id, ACPI_ENABLE_EVENT);
337 acpi_write_bit_register(acpi_gbl_fixed_event_info
338 [ACPI_EVENT_POWER_BUTTON].
339 status_register_id, ACPI_CLEAR_STATUS);
341 acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, ACPI_SST_WORKING);
342 return_ACPI_STATUS(status);
345 #endif /* !ACPI_REDUCED_HARDWARE */