1 /******************************************************************************
3 * Name: hwxfsleep.c - ACPI Hardware Sleep/Wake External Interfaces
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2017, Intel Corp.
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44 #define EXPORT_ACPI_INTERFACES
46 #include <acpi/acpi.h>
49 #define _COMPONENT ACPI_HARDWARE
50 ACPI_MODULE_NAME("hwxfsleep")
52 /* Local prototypes */
53 #if (!ACPI_REDUCED_HARDWARE)
55 acpi_hw_set_firmware_waking_vector(struct acpi_table_facs *facs,
56 acpi_physical_address physical_address,
57 acpi_physical_address physical_address64);
60 static acpi_status acpi_hw_sleep_dispatch(u8 sleep_state, u32 function_id);
63 * Dispatch table used to efficiently branch to the various sleep
66 #define ACPI_SLEEP_FUNCTION_ID 0
67 #define ACPI_WAKE_PREP_FUNCTION_ID 1
68 #define ACPI_WAKE_FUNCTION_ID 2
70 /* Legacy functions are optional, based upon ACPI_REDUCED_HARDWARE */
72 static struct acpi_sleep_functions acpi_sleep_dispatch[] = {
73 {ACPI_STRUCT_INIT(legacy_function,
74 ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_sleep)),
75 ACPI_STRUCT_INIT(extended_function,
76 acpi_hw_extended_sleep)},
77 {ACPI_STRUCT_INIT(legacy_function,
78 ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_wake_prep)),
79 ACPI_STRUCT_INIT(extended_function,
80 acpi_hw_extended_wake_prep)},
81 {ACPI_STRUCT_INIT(legacy_function,
82 ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_wake)),
83 ACPI_STRUCT_INIT(extended_function,
84 acpi_hw_extended_wake)}
88 * These functions are removed for the ACPI_REDUCED_HARDWARE case:
89 * acpi_set_firmware_waking_vector
90 * acpi_enter_sleep_state_s4bios
93 #if (!ACPI_REDUCED_HARDWARE)
94 /*******************************************************************************
96 * FUNCTION: acpi_hw_set_firmware_waking_vector
98 * PARAMETERS: facs - Pointer to FACS table
99 * physical_address - 32-bit physical address of ACPI real mode
101 * physical_address64 - 64-bit physical address of ACPI protected
106 * DESCRIPTION: Sets the firmware_waking_vector fields of the FACS
108 ******************************************************************************/
111 acpi_hw_set_firmware_waking_vector(struct acpi_table_facs *facs,
112 acpi_physical_address physical_address,
113 acpi_physical_address physical_address64)
115 ACPI_FUNCTION_TRACE(acpi_hw_set_firmware_waking_vector);
119 * According to the ACPI specification 2.0c and later, the 64-bit
120 * waking vector should be cleared and the 32-bit waking vector should
121 * be used, unless we want the wake-up code to be called by the BIOS in
122 * Protected Mode. Some systems (for example HP dv5-1004nr) are known
123 * to fail to resume if the 64-bit vector is used.
126 /* Set the 32-bit vector */
128 facs->firmware_waking_vector = (u32)physical_address;
130 if (facs->length > 32) {
131 if (facs->version >= 1) {
133 /* Set the 64-bit vector */
135 facs->xfirmware_waking_vector = physical_address64;
137 /* Clear the 64-bit vector if it exists */
139 facs->xfirmware_waking_vector = 0;
143 return_ACPI_STATUS(AE_OK);
146 /*******************************************************************************
148 * FUNCTION: acpi_set_firmware_waking_vector
150 * PARAMETERS: physical_address - 32-bit physical address of ACPI real mode
152 * physical_address64 - 64-bit physical address of ACPI protected
157 * DESCRIPTION: Sets the firmware_waking_vector fields of the FACS
159 ******************************************************************************/
162 acpi_set_firmware_waking_vector(acpi_physical_address physical_address,
163 acpi_physical_address physical_address64)
166 ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector);
169 (void)acpi_hw_set_firmware_waking_vector(acpi_gbl_FACS,
174 return_ACPI_STATUS(AE_OK);
177 ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector)
179 /*******************************************************************************
181 * FUNCTION: acpi_enter_sleep_state_s4bios
187 * DESCRIPTION: Perform a S4 bios request.
188 * THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
190 ******************************************************************************/
191 acpi_status acpi_enter_sleep_state_s4bios(void)
196 ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_s4bios);
198 /* Clear the wake status bit (PM1) */
201 acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS);
202 if (ACPI_FAILURE(status)) {
203 return_ACPI_STATUS(status);
206 status = acpi_hw_clear_acpi_status();
207 if (ACPI_FAILURE(status)) {
208 return_ACPI_STATUS(status);
212 * 1) Disable/Clear all GPEs
213 * 2) Enable all wakeup GPEs
215 status = acpi_hw_disable_all_gpes();
216 if (ACPI_FAILURE(status)) {
217 return_ACPI_STATUS(status);
219 acpi_gbl_system_awake_and_running = FALSE;
221 status = acpi_hw_enable_all_wakeup_gpes();
222 if (ACPI_FAILURE(status)) {
223 return_ACPI_STATUS(status);
226 status = acpi_hw_write_port(acpi_gbl_FADT.smi_command,
227 (u32)acpi_gbl_FADT.s4_bios_request, 8);
230 acpi_os_stall(ACPI_USEC_PER_MSEC);
232 acpi_read_bit_register(ACPI_BITREG_WAKE_STATUS, &in_value);
233 if (ACPI_FAILURE(status)) {
234 return_ACPI_STATUS(status);
239 return_ACPI_STATUS(AE_OK);
242 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios)
243 #endif /* !ACPI_REDUCED_HARDWARE */
244 /*******************************************************************************
246 * FUNCTION: acpi_hw_sleep_dispatch
248 * PARAMETERS: sleep_state - Which sleep state to enter/exit
249 * function_id - Sleep, wake_prep, or Wake
251 * RETURN: Status from the invoked sleep handling function.
253 * DESCRIPTION: Dispatch a sleep/wake request to the appropriate handling
256 ******************************************************************************/
257 static acpi_status acpi_hw_sleep_dispatch(u8 sleep_state, u32 function_id)
260 struct acpi_sleep_functions *sleep_functions =
261 &acpi_sleep_dispatch[function_id];
263 #if (!ACPI_REDUCED_HARDWARE)
265 * If the Hardware Reduced flag is set (from the FADT), we must
266 * use the extended sleep registers (FADT). Note: As per the ACPI
267 * specification, these extended registers are to be used for HW-reduced
268 * platforms only. They are not general-purpose replacements for the
269 * legacy PM register sleep support.
271 if (acpi_gbl_reduced_hardware) {
272 status = sleep_functions->extended_function(sleep_state);
276 status = sleep_functions->legacy_function(sleep_state);
283 * For the case where reduced-hardware-only code is being generated,
284 * we know that only the extended sleep registers are available
286 status = sleep_functions->extended_function(sleep_state);
289 #endif /* !ACPI_REDUCED_HARDWARE */
292 /*******************************************************************************
294 * FUNCTION: acpi_enter_sleep_state_prep
296 * PARAMETERS: sleep_state - Which sleep state to enter
300 * DESCRIPTION: Prepare to enter a system sleep state.
301 * This function must execute with interrupts enabled.
302 * We break sleeping into 2 stages so that OSPM can handle
303 * various OS-specific tasks between the two steps.
305 ******************************************************************************/
307 acpi_status acpi_enter_sleep_state_prep(u8 sleep_state)
310 struct acpi_object_list arg_list;
311 union acpi_object arg;
314 ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_prep);
316 status = acpi_get_sleep_type_data(sleep_state,
317 &acpi_gbl_sleep_type_a,
318 &acpi_gbl_sleep_type_b);
319 if (ACPI_FAILURE(status)) {
320 return_ACPI_STATUS(status);
323 status = acpi_get_sleep_type_data(ACPI_STATE_S0,
324 &acpi_gbl_sleep_type_a_s0,
325 &acpi_gbl_sleep_type_b_s0);
326 if (ACPI_FAILURE(status)) {
327 acpi_gbl_sleep_type_a_s0 = ACPI_SLEEP_TYPE_INVALID;
330 /* Execute the _PTS method (Prepare To Sleep) */
333 arg_list.pointer = &arg;
334 arg.type = ACPI_TYPE_INTEGER;
335 arg.integer.value = sleep_state;
338 acpi_evaluate_object(NULL, METHOD_PATHNAME__PTS, &arg_list, NULL);
339 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
340 return_ACPI_STATUS(status);
343 /* Setup the argument to the _SST method (System STatus) */
345 switch (sleep_state) {
348 sst_value = ACPI_SST_WORKING;
355 sst_value = ACPI_SST_SLEEPING;
360 sst_value = ACPI_SST_SLEEP_CONTEXT;
365 sst_value = ACPI_SST_INDICATOR_OFF; /* Default is off */
370 * Set the system indicators to show the desired sleep state.
371 * _SST is an optional method (return no error if not found)
373 acpi_hw_execute_sleep_method(METHOD_PATHNAME__SST, sst_value);
374 return_ACPI_STATUS(AE_OK);
377 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep)
379 /*******************************************************************************
381 * FUNCTION: acpi_enter_sleep_state
383 * PARAMETERS: sleep_state - Which sleep state to enter
387 * DESCRIPTION: Enter a system sleep state
388 * THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
390 ******************************************************************************/
391 acpi_status acpi_enter_sleep_state(u8 sleep_state)
395 ACPI_FUNCTION_TRACE(acpi_enter_sleep_state);
397 if ((acpi_gbl_sleep_type_a > ACPI_SLEEP_TYPE_MAX) ||
398 (acpi_gbl_sleep_type_b > ACPI_SLEEP_TYPE_MAX)) {
399 ACPI_ERROR((AE_INFO, "Sleep values out of range: A=0x%X B=0x%X",
400 acpi_gbl_sleep_type_a, acpi_gbl_sleep_type_b));
401 return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
404 status = acpi_hw_sleep_dispatch(sleep_state, ACPI_SLEEP_FUNCTION_ID);
405 return_ACPI_STATUS(status);
408 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state)
410 /*******************************************************************************
412 * FUNCTION: acpi_leave_sleep_state_prep
414 * PARAMETERS: sleep_state - Which sleep state we are exiting
418 * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a
419 * sleep. Called with interrupts DISABLED.
420 * We break wake/resume into 2 stages so that OSPM can handle
421 * various OS-specific tasks between the two steps.
423 ******************************************************************************/
424 acpi_status acpi_leave_sleep_state_prep(u8 sleep_state)
428 ACPI_FUNCTION_TRACE(acpi_leave_sleep_state_prep);
431 acpi_hw_sleep_dispatch(sleep_state, ACPI_WAKE_PREP_FUNCTION_ID);
432 return_ACPI_STATUS(status);
435 ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state_prep)
437 /*******************************************************************************
439 * FUNCTION: acpi_leave_sleep_state
441 * PARAMETERS: sleep_state - Which sleep state we are exiting
445 * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
446 * Called with interrupts ENABLED.
448 ******************************************************************************/
449 acpi_status acpi_leave_sleep_state(u8 sleep_state)
453 ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
455 status = acpi_hw_sleep_dispatch(sleep_state, ACPI_WAKE_FUNCTION_ID);
456 return_ACPI_STATUS(status);
459 ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state)