ACPICA: ACPI 5: Support for new FADT SleepStatus, SleepControl registers

Adds sleep and wake support for systems with these registers.
One new file, hwxfsleep.c

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 298 insertions, 268 deletions

diff --git a/drivers/acpi/acpica/hwsleep.c b/drivers/acpi/acpica/hwsleep.c
index 3c4a922a9fc2..59a2a6b897d4 100644
--- a/drivers/acpi/acpica/hwsleep.c
+++ b/drivers/acpi/acpica/hwsleep.c
@@ -1,7 +1,6 @@
-
 /******************************************************************************
  *
- * Name: hwsleep.c - ACPI Hardware Sleep/Wake Interface
+ * Name: hwsleep.c - ACPI Hardware Sleep/Wake Support Functions
  *
  *****************************************************************************/
 
@@ -44,212 +43,183 @@
 
 #include <acpi/acpi.h>
 #include "accommon.h"
-#include "actables.h"
 #include <linux/tboot.h>
 #include <linux/module.h>
 
 #define _COMPONENT          ACPI_HARDWARE
 ACPI_MODULE_NAME("hwsleep")
 
+/* Local prototypes */
+static void acpi_hw_execute_GTS(u8 sleep_state);
+
+static void acpi_hw_execute_BFS(u8 sleep_state);
+
+static void acpi_hw_execute_WAK(u8 sleep_state);
+
+static unsigned int gts, bfs;
+module_param(gts, uint, 0644);
+module_param(bfs, uint, 0644);
+MODULE_PARM_DESC(gts, "Enable evaluation of _GTS on suspend.");
+MODULE_PARM_DESC(bfs, "Enable evaluation of _BFS on resume".);
+
 /*******************************************************************************
  *
- * FUNCTION:    acpi_set_firmware_waking_vector
+ * FUNCTION:    acpi_hw_execute_GTS
  *
- * PARAMETERS:  physical_address    - 32-bit physical address of ACPI real mode
- *                                    entry point.
+ * PARAMETERS:  sleep_state         - Sleep state that will be entered
  *
- * RETURN:      Status
+ * RETURN:      None
  *
- * DESCRIPTION: Sets the 32-bit firmware_waking_vector field of the FACS
+ * DESCRIPTION: Execute the optional _GTS method (Going To Sleep)
  *
  ******************************************************************************/
-acpi_status
-acpi_set_firmware_waking_vector(u32 physical_address)
-{
-        ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector);
-
 
-        /*
-         * According to the ACPI specification 2.0c and later, the 64-bit
-         * waking vector should be cleared and the 32-bit waking vector should
-         * be used, unless we want the wake-up code to be called by the BIOS in
-         * Protected Mode.  Some systems (for example HP dv5-1004nr) are known
-         * to fail to resume if the 64-bit vector is used.
-         */
+static void acpi_hw_execute_GTS(u8 sleep_state)
+{
+        struct acpi_object_list arg_list;
+        union acpi_object arg;
+        acpi_status status;
 
-        /* Set the 32-bit vector */
+        if (!gts)
+                return;
 
-        acpi_gbl_FACS->firmware_waking_vector = physical_address;
+        /* One argument, sleep_state */
 
-        /* Clear the 64-bit vector if it exists */
+        arg_list.count = 1;
+        arg_list.pointer = &arg;
+        arg.type = ACPI_TYPE_INTEGER;
+        arg.integer.value = sleep_state;
 
-        if ((acpi_gbl_FACS->length > 32) && (acpi_gbl_FACS->version >= 1)) {
-                acpi_gbl_FACS->xfirmware_waking_vector = 0;
+        status = acpi_evaluate_object(NULL, METHOD_NAME__GTS, &arg_list, NULL);
+        if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
+                ACPI_EXCEPTION((AE_INFO, status,
+                                "While executing method _GTS"));
         }
-
-        return_ACPI_STATUS(AE_OK);
 }
 
-ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector)
-
-#if ACPI_MACHINE_WIDTH == 64
 /*******************************************************************************
  *
- * FUNCTION:    acpi_set_firmware_waking_vector64
+ * FUNCTION:    acpi_hw_execute_BFS
  *
- * PARAMETERS:  physical_address    - 64-bit physical address of ACPI protected
- *                                    mode entry point.
+ * PARAMETERS:  sleep_state         - Which sleep state we just exited
  *
- * RETURN:      Status
+ * RETURN:      None
  *
- * DESCRIPTION: Sets the 64-bit X_firmware_waking_vector field of the FACS, if
- *              it exists in the table. This function is intended for use with
- *              64-bit host operating systems.
+ * DESCRIPTION: Execute the optional _BFS method (Back From Sleep)
  *
  ******************************************************************************/
-acpi_status
-acpi_set_firmware_waking_vector64(u64 physical_address)
-{
-        ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector64);
-
 
-        /* Determine if the 64-bit vector actually exists */
+static void acpi_hw_execute_BFS(u8 sleep_state)
+{
+        struct acpi_object_list arg_list;
+        union acpi_object arg;
+        acpi_status status;
 
-        if ((acpi_gbl_FACS->length <= 32) || (acpi_gbl_FACS->version < 1)) {
-                return_ACPI_STATUS(AE_NOT_EXIST);
-        }
+        if (!bfs)
+                return;
 
-        /* Clear 32-bit vector, set the 64-bit X_ vector */
+        /* One argument, sleep_state */
 
-        acpi_gbl_FACS->firmware_waking_vector = 0;
-        acpi_gbl_FACS->xfirmware_waking_vector = physical_address;
+        arg_list.count = 1;
+        arg_list.pointer = &arg;
+        arg.type = ACPI_TYPE_INTEGER;
+        arg.integer.value = sleep_state;
 
-        return_ACPI_STATUS(AE_OK);
+        status = acpi_evaluate_object(NULL, METHOD_NAME__BFS, &arg_list, NULL);
+        if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
+                ACPI_EXCEPTION((AE_INFO, status,
+                                "While executing method _BFS"));
+        }
 }
 
-ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector64)
-#endif
-
 /*******************************************************************************
  *
- * FUNCTION:    acpi_enter_sleep_state_prep
+ * FUNCTION:    acpi_hw_execute_WAK
  *
- * PARAMETERS:  sleep_state         - Which sleep state to enter
+ * PARAMETERS:  sleep_state         - Which sleep state we just exited
  *
- * RETURN:      Status
+ * RETURN:      None
  *
- * DESCRIPTION: Prepare to enter a system sleep state (see ACPI 2.0 spec p 231)
- *              This function must execute with interrupts enabled.
- *              We break sleeping into 2 stages so that OSPM can handle
- *              various OS-specific tasks between the two steps.
+ * DESCRIPTION: Execute the _WAK method (System Wake)
  *
  ******************************************************************************/
-acpi_status acpi_enter_sleep_state_prep(u8 sleep_state)
+
+static void acpi_hw_execute_WAK(u8 sleep_state)
 {
-        acpi_status status;
         struct acpi_object_list arg_list;
         union acpi_object arg;
+        acpi_status status;
 
-        ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_prep);
-
-        /* _PSW methods could be run here to enable wake-on keyboard, LAN, etc. */
-
-        status = acpi_get_sleep_type_data(sleep_state,
-                                          &acpi_gbl_sleep_type_a,
-                                          &acpi_gbl_sleep_type_b);
-        if (ACPI_FAILURE(status)) {
-                return_ACPI_STATUS(status);
-        }
-
-        /* Setup parameter object */
+        /* One argument, sleep_state */
 
         arg_list.count = 1;
         arg_list.pointer = &arg;
-
         arg.type = ACPI_TYPE_INTEGER;
         arg.integer.value = sleep_state;
 
-        /* Run the _PTS method */
-
-        status = acpi_evaluate_object(NULL, METHOD_NAME__PTS, &arg_list, NULL);
+        status = acpi_evaluate_object(NULL, METHOD_NAME__WAK, &arg_list, NULL);
         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
-                return_ACPI_STATUS(status);
+                ACPI_EXCEPTION((AE_INFO, status,
+                                "While executing method _WAK"));
         }
+        /* TBD: _WAK "sometimes" returns stuff - do we want to look at it? */
+}
 
-        /* Setup the argument to _SST */
-
-        switch (sleep_state) {
-        case ACPI_STATE_S0:
-                arg.integer.value = ACPI_SST_WORKING;
-                break;
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_hw_execute_SST
+ *
+ * PARAMETERS:  indicator_id        - Value to be passed to the _SST method
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Execute the optional _SST method (System Status)
+ *
+ ******************************************************************************/
 
-        case ACPI_STATE_S1:
-        case ACPI_STATE_S2:
-        case ACPI_STATE_S3:
-                arg.integer.value = ACPI_SST_SLEEPING;
-                break;
+void acpi_hw_execute_SST(u32 indicator_id)
+{
+        struct acpi_object_list arg_list;
+        union acpi_object arg;
+        acpi_status status;
 
-        case ACPI_STATE_S4:
-                arg.integer.value = ACPI_SST_SLEEP_CONTEXT;
-                break;
+        /* One argument, status indicator ID */
 
-        default:
-                arg.integer.value = ACPI_SST_INDICATOR_OFF;     /* Default is off */
-                break;
-        }
+        arg_list.count = 1;
+        arg_list.pointer = &arg;
+        arg.type = ACPI_TYPE_INTEGER;
 
-        /*
-         * Set the system indicators to show the desired sleep state.
-         * _SST is an optional method (return no error if not found)
-         */
+        arg.integer.value = indicator_id;
         status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
                 ACPI_EXCEPTION((AE_INFO, status,
                                 "While executing method _SST"));
         }
-
-        return_ACPI_STATUS(AE_OK);
 }
 
-ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep)
-
-static unsigned int gts, bfs;
-module_param(gts, uint, 0644);
-module_param(bfs, uint, 0644);
-MODULE_PARM_DESC(gts, "Enable evaluation of _GTS on suspend.");
-MODULE_PARM_DESC(bfs, "Enable evaluation of _BFS on resume".);
-
 /*******************************************************************************
  *
- * FUNCTION:    acpi_enter_sleep_state
+ * FUNCTION:    acpi_hw_legacy_sleep
  *
  * PARAMETERS:  sleep_state         - Which sleep state to enter
  *
  * RETURN:      Status
  *
- * DESCRIPTION: Enter a system sleep state (see ACPI 2.0 spec p 231)
+ * DESCRIPTION: Enter a system sleep state via the legacy FADT PM registers
  *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
  *
  ******************************************************************************/
-acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state)
+
+acpi_status acpi_hw_legacy_sleep(u8 sleep_state)
 {
-        u32 pm1a_control;
-        u32 pm1b_control;
         struct acpi_bit_register_info *sleep_type_reg_info;
         struct acpi_bit_register_info *sleep_enable_reg_info;
+        u32 pm1a_control;
+        u32 pm1b_control;
         u32 in_value;
-        struct acpi_object_list arg_list;
-        union acpi_object arg;
         acpi_status status;
 
-        ACPI_FUNCTION_TRACE(acpi_enter_sleep_state);
-
-        if ((acpi_gbl_sleep_type_a > ACPI_SLEEP_TYPE_MAX) ||
-            (acpi_gbl_sleep_type_b > ACPI_SLEEP_TYPE_MAX)) {
-                ACPI_ERROR((AE_INFO, "Sleep values out of range: A=0x%X B=0x%X",
-                            acpi_gbl_sleep_type_a, acpi_gbl_sleep_type_b));
-                return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
-        }
+        ACPI_FUNCTION_TRACE(hw_legacy_sleep);
 
         sleep_type_reg_info =
             acpi_hw_get_bit_register_info(ACPI_BITREG_SLEEP_TYPE);
@@ -271,6 +241,18 @@ acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state)
                 return_ACPI_STATUS(status);
         }
 
+        if (sleep_state != ACPI_STATE_S5) {
+                /*
+                 * Disable BM arbitration. This feature is contained within an
+                 * optional register (PM2 Control), so ignore a BAD_ADDRESS
+                 * exception.
+                 */
+                status = acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 1);
+                if (ACPI_FAILURE(status) && (status != AE_BAD_ADDRESS)) {
+                        return_ACPI_STATUS(status);
+                }
+        }
+
         /*
          * 1) Disable/Clear all GPEs
          * 2) Enable all wakeup GPEs
@@ -286,19 +268,9 @@ acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state)
                 return_ACPI_STATUS(status);
         }
 
-        if (gts) {
-                /* Execute the _GTS method */
+        /* Execute the _GTS method (Going To Sleep) */
 
-                arg_list.count = 1;
-                arg_list.pointer = &arg;
-                arg.type = ACPI_TYPE_INTEGER;
-                arg.integer.value = sleep_state;
-
-                status = acpi_evaluate_object(NULL, METHOD_NAME__GTS, &arg_list, NULL);
-                if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
-                        return_ACPI_STATUS(status);
-                }
-        }
+        acpi_hw_execute_GTS(sleep_state);
 
         /* Get current value of PM1A control */
 
@@ -375,114 +347,43 @@ acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state)
                 }
         }
 
-        /* Wait until we enter sleep state */
-
-        do {
-                status = acpi_read_bit_register(ACPI_BITREG_WAKE_STATUS,
-                                                    &in_value);
-                if (ACPI_FAILURE(status)) {
-                        return_ACPI_STATUS(status);
-                }
-
-                /* Spin until we wake */
-
-        } while (!in_value);
-
-        return_ACPI_STATUS(AE_OK);
-}
-
-ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state)
-
-/*******************************************************************************
- *
- * FUNCTION:    acpi_enter_sleep_state_s4bios
- *
- * PARAMETERS:  None
- *
- * RETURN:      Status
- *
- * DESCRIPTION: Perform a S4 bios request.
- *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
- *
- ******************************************************************************/
-acpi_status asmlinkage acpi_enter_sleep_state_s4bios(void)
-{
-        u32 in_value;
-        acpi_status status;
-
-        ACPI_FUNCTION_TRACE(acpi_enter_sleep_state_s4bios);
-
-        /* Clear the wake status bit (PM1) */
-
-        status =
-            acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS, ACPI_CLEAR_STATUS);
-        if (ACPI_FAILURE(status)) {
-                return_ACPI_STATUS(status);
-        }
-
-        status = acpi_hw_clear_acpi_status();
-        if (ACPI_FAILURE(status)) {
-                return_ACPI_STATUS(status);
-        }
-
-        /*
-         * 1) Disable/Clear all GPEs
-         * 2) Enable all wakeup GPEs
-         */
-        status = acpi_hw_disable_all_gpes();
-        if (ACPI_FAILURE(status)) {
-                return_ACPI_STATUS(status);
-        }
-        acpi_gbl_system_awake_and_running = FALSE;
-
-        status = acpi_hw_enable_all_wakeup_gpes();
-        if (ACPI_FAILURE(status)) {
-                return_ACPI_STATUS(status);
-        }
-
-        ACPI_FLUSH_CPU_CACHE();
-
-        status = acpi_hw_write_port(acpi_gbl_FADT.smi_command,
-                                    (u32) acpi_gbl_FADT.S4bios_request, 8);
+        /* Wait for transition back to Working State */
 
         do {
-                acpi_os_stall(1000);
                 status =
                     acpi_read_bit_register(ACPI_BITREG_WAKE_STATUS, &in_value);
                 if (ACPI_FAILURE(status)) {
                         return_ACPI_STATUS(status);
                 }
+
         } while (!in_value);
 
         return_ACPI_STATUS(AE_OK);
 }
 
-ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios)
-
 /*******************************************************************************
  *
- * FUNCTION:    acpi_leave_sleep_state_prep
+ * FUNCTION:    acpi_hw_legacy_wake_prep
  *
- * PARAMETERS:  sleep_state         - Which sleep state we are exiting
+ * PARAMETERS:  sleep_state         - Which sleep state we just exited
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a
  *              sleep.
- *              Called with interrupts DISABLED.
+ *              Called with interrupts ENABLED.
  *
  ******************************************************************************/
-acpi_status acpi_leave_sleep_state_prep(u8 sleep_state)
+
+acpi_status acpi_hw_legacy_wake_prep(u8 sleep_state)
 {
-        struct acpi_object_list arg_list;
-        union acpi_object arg;
         acpi_status status;
         struct acpi_bit_register_info *sleep_type_reg_info;
         struct acpi_bit_register_info *sleep_enable_reg_info;
         u32 pm1a_control;
         u32 pm1b_control;
 
-        ACPI_FUNCTION_TRACE(acpi_leave_sleep_state_prep);
+        ACPI_FUNCTION_TRACE(hw_legacy_wake_prep);
 
         /*
          * Set SLP_TYPE and SLP_EN to state S0.
@@ -525,25 +426,13 @@ acpi_status acpi_leave_sleep_state_prep(u8 sleep_state)
                 }
         }
 
-        if (bfs) {
-                /* Execute the _BFS method */
-
-                arg_list.count = 1;
-                arg_list.pointer = &arg;
-                arg.type = ACPI_TYPE_INTEGER;
-                arg.integer.value = sleep_state;
-
-                status = acpi_evaluate_object(NULL, METHOD_NAME__BFS, &arg_list, NULL);
-                if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
-                        ACPI_EXCEPTION((AE_INFO, status, "During Method _BFS"));
-                }
-        }
+        acpi_hw_execute_BFS(sleep_state);
         return_ACPI_STATUS(status);
 }
 
 /*******************************************************************************
  *
- * FUNCTION:    acpi_leave_sleep_state
+ * FUNCTION:    acpi_hw_legacy_wake
  *
  * PARAMETERS:  sleep_state         - Which sleep state we just exited
  *
@@ -553,31 +442,17 @@ acpi_status acpi_leave_sleep_state_prep(u8 sleep_state)
  *              Called with interrupts ENABLED.
  *
  ******************************************************************************/
-acpi_status acpi_leave_sleep_state(u8 sleep_state)
+
+acpi_status acpi_hw_legacy_wake(u8 sleep_state)
 {
-        struct acpi_object_list arg_list;
-        union acpi_object arg;
         acpi_status status;
 
-        ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
+        ACPI_FUNCTION_TRACE(hw_legacy_wake);
 
         /* Ensure enter_sleep_state_prep -> enter_sleep_state ordering */
 
         acpi_gbl_sleep_type_a = ACPI_SLEEP_TYPE_INVALID;
-
-        /* Setup parameter object */
-
-        arg_list.count = 1;
-        arg_list.pointer = &arg;
-        arg.type = ACPI_TYPE_INTEGER;
-
-        /* Ignore any errors from these methods */
-
-        arg.integer.value = ACPI_SST_WAKING;
-        status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
-        if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
-                ACPI_EXCEPTION((AE_INFO, status, "During Method _SST"));
-        }
+        acpi_hw_execute_SST(ACPI_SST_WAKING);
 
         /*
          * GPEs must be enabled before _WAK is called as GPEs
@@ -591,46 +466,201 @@ acpi_status acpi_leave_sleep_state(u8 sleep_state)
         if (ACPI_FAILURE(status)) {
                 return_ACPI_STATUS(status);
         }
+
         status = acpi_hw_enable_all_runtime_gpes();
         if (ACPI_FAILURE(status)) {
                 return_ACPI_STATUS(status);
         }
 
-        arg.integer.value = sleep_state;
-        status = acpi_evaluate_object(NULL, METHOD_NAME__WAK, &arg_list, NULL);
-        if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
-                ACPI_EXCEPTION((AE_INFO, status, "During Method _WAK"));
-        }
-        /* TBD: _WAK "sometimes" returns stuff - do we want to look at it? */
+        /*
+         * Now we can execute _WAK, etc. Some machines require that the GPEs
+         * are enabled before the wake methods are executed.
+         */
+        acpi_hw_execute_WAK(sleep_state);
 
         /*
-         * Some BIOSes assume that WAK_STS will be cleared on resume and use
-         * it to determine whether the system is rebooting or resuming. Clear
-         * it for compatibility.
+         * Some BIOS code assumes that WAK_STS will be cleared on resume
+         * and use it to determine whether the system is rebooting or
+         * resuming. Clear WAK_STS for compatibility.
          */
         acpi_write_bit_register(ACPI_BITREG_WAKE_STATUS, 1);
-
         acpi_gbl_system_awake_and_running = TRUE;
 
         /* Enable power button */
 
         (void)
             acpi_write_bit_register(acpi_gbl_fixed_event_info
-                              [ACPI_EVENT_POWER_BUTTON].
-                              enable_register_id, ACPI_ENABLE_EVENT);
+                                    [ACPI_EVENT_POWER_BUTTON].
+                                    enable_register_id, ACPI_ENABLE_EVENT);
 
         (void)
             acpi_write_bit_register(acpi_gbl_fixed_event_info
-                              [ACPI_EVENT_POWER_BUTTON].
-                              status_register_id, ACPI_CLEAR_STATUS);
+                                    [ACPI_EVENT_POWER_BUTTON].
+                                    status_register_id, ACPI_CLEAR_STATUS);
 
-        arg.integer.value = ACPI_SST_WORKING;
-        status = acpi_evaluate_object(NULL, METHOD_NAME__SST, &arg_list, NULL);
-        if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
-                ACPI_EXCEPTION((AE_INFO, status, "During Method _SST"));
+        /*
+         * Enable BM arbitration. This feature is contained within an
+         * optional register (PM2 Control), so ignore a BAD_ADDRESS
+         * exception.
+         */
+        status = acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 0);
+        if (ACPI_FAILURE(status) && (status != AE_BAD_ADDRESS)) {
+                return_ACPI_STATUS(status);
         }
 
+        acpi_hw_execute_SST(ACPI_SST_WORKING);
         return_ACPI_STATUS(status);
 }
 
-ACPI_EXPORT_SYMBOL(acpi_leave_sleep_state)
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_hw_extended_sleep
+ *
+ * PARAMETERS:  sleep_state         - Which sleep state to enter
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Enter a system sleep state via the extended FADT sleep
+ *              registers (V5 FADT).
+ *              THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
+ *
+ ******************************************************************************/
+
+acpi_status acpi_hw_extended_sleep(u8 sleep_state)
+{
+        acpi_status status;
+        u8 sleep_type_value;
+        u64 sleep_status;
+
+        ACPI_FUNCTION_TRACE(hw_extended_sleep);
+
+        /* Extended sleep registers must be valid */
+
+        if (!acpi_gbl_FADT.sleep_control.address ||
+            !acpi_gbl_FADT.sleep_status.address) {
+                return_ACPI_STATUS(AE_NOT_EXIST);
+        }
+
+        /* Clear wake status (WAK_STS) */
+
+        status = acpi_write(ACPI_X_WAKE_STATUS, &acpi_gbl_FADT.sleep_status);
+        if (ACPI_FAILURE(status)) {
+                return_ACPI_STATUS(status);
+        }
+
+        acpi_gbl_system_awake_and_running = FALSE;
+
+        /* Execute the _GTS method (Going To Sleep) */
+
+        acpi_hw_execute_GTS(sleep_state);
+
+        /* Flush caches, as per ACPI specification */
+
+        ACPI_FLUSH_CPU_CACHE();
+
+        /*
+         * Set the SLP_TYP and SLP_EN bits.
+         *
+         * Note: We only use the first value returned by the \_Sx method
+         * (acpi_gbl_sleep_type_a) - As per ACPI specification.
+         */
+        ACPI_DEBUG_PRINT((ACPI_DB_INIT,
+                          "Entering sleep state [S%u]\n", sleep_state));
+
+        sleep_type_value =
+            ((acpi_gbl_sleep_type_a << ACPI_X_SLEEP_TYPE_POSITION) &
+             ACPI_X_SLEEP_TYPE_MASK);
+
+        status = acpi_write((sleep_type_value | ACPI_X_SLEEP_ENABLE),
+                            &acpi_gbl_FADT.sleep_control);
+        if (ACPI_FAILURE(status)) {
+                return_ACPI_STATUS(status);
+        }
+
+        /* Wait for transition back to Working State */
+
+        do {
+                status = acpi_read(&sleep_status, &acpi_gbl_FADT.sleep_status);
+                if (ACPI_FAILURE(status)) {
+                        return_ACPI_STATUS(status);
+                }
+
+        } while (!(((u8)sleep_status) & ACPI_X_WAKE_STATUS));
+
+        return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_hw_extended_wake_prep
+ *
+ * PARAMETERS:  sleep_state         - Which sleep state we just exited
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Perform first part of OS-independent ACPI cleanup after
+ *              a sleep. Called with interrupts ENABLED.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_hw_extended_wake_prep(u8 sleep_state)
+{
+        acpi_status status;
+        u8 sleep_type_value;
+
+        ACPI_FUNCTION_TRACE(hw_extended_wake_prep);
+
+        status = acpi_get_sleep_type_data(ACPI_STATE_S0,
+                                          &acpi_gbl_sleep_type_a,
+                                          &acpi_gbl_sleep_type_b);
+        if (ACPI_SUCCESS(status)) {
+                sleep_type_value =
+                    ((acpi_gbl_sleep_type_a << ACPI_X_SLEEP_TYPE_POSITION) &
+                     ACPI_X_SLEEP_TYPE_MASK);
+
+                (void)acpi_write((sleep_type_value | ACPI_X_SLEEP_ENABLE),
+                                 &acpi_gbl_FADT.sleep_control);
+        }
+
+        acpi_hw_execute_BFS(sleep_state);
+        return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_hw_extended_wake
+ *
+ * PARAMETERS:  sleep_state         - Which sleep state we just exited
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
+ *              Called with interrupts ENABLED.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_hw_extended_wake(u8 sleep_state)
+{
+        ACPI_FUNCTION_TRACE(hw_extended_wake);
+
+        /* Ensure enter_sleep_state_prep -> enter_sleep_state ordering */
+
+        acpi_gbl_sleep_type_a = ACPI_SLEEP_TYPE_INVALID;
+
+        /* Execute the wake methods */
+
+        acpi_hw_execute_SST(ACPI_SST_WAKING);
+        acpi_hw_execute_WAK(sleep_state);
+
+        /*
+         * Some BIOS code assumes that WAK_STS will be cleared on resume
+         * and use it to determine whether the system is rebooting or
+         * resuming. Clear WAK_STS for compatibility.
+         */
+        (void)acpi_write(ACPI_X_WAKE_STATUS, &acpi_gbl_FADT.sleep_status);
+        acpi_gbl_system_awake_and_running = TRUE;
+
+        acpi_hw_execute_SST(ACPI_SST_WORKING);
+        return_ACPI_STATUS(AE_OK);
+}