1 files changed, 621 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/evmisc.c b/drivers/acpi/acpica/evmisc.c
new file mode 100644
index 000000000000..5f893057bcc6
--- /dev/null
+++ b/drivers/acpi/acpica/evmisc.c
@@ -0,0 +1,621 @@
+/******************************************************************************
+ *
+ * Module Name: evmisc - Miscellaneous event manager support functions
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2008, Intel Corp.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
+ *    substantially similar to the "NO WARRANTY" disclaimer below
+ *    ("Disclaimer") and any redistribution must be conditioned upon
+ *    including a substantially similar Disclaimer requirement for further
+ *    binary redistribution.
+ * 3. Neither the names of the above-listed copyright holders nor the names
+ *    of any contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * NO WARRANTY
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGES.
+ */
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+#include "acevents.h"
+#include "acnamesp.h"
+#include "acinterp.h"
+
+#define _COMPONENT          ACPI_EVENTS
+ACPI_MODULE_NAME("evmisc")
+
+/* Local prototypes */
+static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context);
+
+static u32 acpi_ev_global_lock_handler(void *context);
+
+static acpi_status acpi_ev_remove_global_lock_handler(void);
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_is_notify_object
+ *
+ * PARAMETERS:  Node            - Node to check
+ *
+ * RETURN:      TRUE if notifies allowed on this object
+ *
+ * DESCRIPTION: Check type of node for a object that supports notifies.
+ *
+ *              TBD: This could be replaced by a flag bit in the node.
+ *
+ ******************************************************************************/
+
+u8 acpi_ev_is_notify_object(struct acpi_namespace_node *node)
+{
+        switch (node->type) {
+        case ACPI_TYPE_DEVICE:
+        case ACPI_TYPE_PROCESSOR:
+        case ACPI_TYPE_THERMAL:
+                /*
+                 * These are the ONLY objects that can receive ACPI notifications
+                 */
+                return (TRUE);
+
+        default:
+                return (FALSE);
+        }
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_queue_notify_request
+ *
+ * PARAMETERS:  Node            - NS node for the notified object
+ *              notify_value    - Value from the Notify() request
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Dispatch a device notification event to a previously
+ *              installed handler.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ev_queue_notify_request(struct acpi_namespace_node * node,
+                             u32 notify_value)
+{
+        union acpi_operand_object *obj_desc;
+        union acpi_operand_object *handler_obj = NULL;
+        union acpi_generic_state *notify_info;
+        acpi_status status = AE_OK;
+
+        ACPI_FUNCTION_NAME(ev_queue_notify_request);
+
+        /*
+         * For value 3 (Ejection Request), some device method may need to be run.
+         * For value 2 (Device Wake) if _PRW exists, the _PS0 method may need
+         *   to be run.
+         * For value 0x80 (Status Change) on the power button or sleep button,
+         *   initiate soft-off or sleep operation?
+         */
+        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+                          "Dispatching Notify on [%4.4s] Node %p Value 0x%2.2X (%s)\n",
+                          acpi_ut_get_node_name(node), node, notify_value,
+                          acpi_ut_get_notify_name(notify_value)));
+
+        /* Get the notify object attached to the NS Node */
+
+        obj_desc = acpi_ns_get_attached_object(node);
+        if (obj_desc) {
+
+                /* We have the notify object, Get the right handler */
+
+                switch (node->type) {
+
+                        /* Notify allowed only on these types */
+
+                case ACPI_TYPE_DEVICE:
+                case ACPI_TYPE_THERMAL:
+                case ACPI_TYPE_PROCESSOR:
+
+                        if (notify_value <= ACPI_MAX_SYS_NOTIFY) {
+                                handler_obj =
+                                    obj_desc->common_notify.system_notify;
+                        } else {
+                                handler_obj =
+                                    obj_desc->common_notify.device_notify;
+                        }
+                        break;
+
+                default:
+
+                        /* All other types are not supported */
+
+                        return (AE_TYPE);
+                }
+        }
+
+        /*
+         * If there is any handler to run, schedule the dispatcher.
+         * Check for:
+         * 1) Global system notify handler
+         * 2) Global device notify handler
+         * 3) Per-device notify handler
+         */
+        if ((acpi_gbl_system_notify.handler
+             && (notify_value <= ACPI_MAX_SYS_NOTIFY))
+            || (acpi_gbl_device_notify.handler
+                && (notify_value > ACPI_MAX_SYS_NOTIFY)) || handler_obj) {
+                notify_info = acpi_ut_create_generic_state();
+                if (!notify_info) {
+                        return (AE_NO_MEMORY);
+                }
+
+                if (!handler_obj) {
+                        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+                                          "Executing system notify handler for Notify (%4.4s, %X) node %p\n",
+                                          acpi_ut_get_node_name(node),
+                                          notify_value, node));
+                }
+
+                notify_info->common.descriptor_type =
+                    ACPI_DESC_TYPE_STATE_NOTIFY;
+                notify_info->notify.node = node;
+                notify_info->notify.value = (u16) notify_value;
+                notify_info->notify.handler_obj = handler_obj;
+
+                status =
+                    acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_ev_notify_dispatch,
+                                    notify_info);
+                if (ACPI_FAILURE(status)) {
+                        acpi_ut_delete_generic_state(notify_info);
+                }
+        } else {
+                /* There is no notify handler (per-device or system) for this device */
+
+                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+                                  "No notify handler for Notify (%4.4s, %X) node %p\n",
+                                  acpi_ut_get_node_name(node), notify_value,
+                                  node));
+        }
+
+        return (status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_notify_dispatch
+ *
+ * PARAMETERS:  Context         - To be passed to the notify handler
+ *
+ * RETURN:      None.
+ *
+ * DESCRIPTION: Dispatch a device notification event to a previously
+ *              installed handler.
+ *
+ ******************************************************************************/
+
+static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context)
+{
+        union acpi_generic_state *notify_info =
+            (union acpi_generic_state *)context;
+        acpi_notify_handler global_handler = NULL;
+        void *global_context = NULL;
+        union acpi_operand_object *handler_obj;
+
+        ACPI_FUNCTION_ENTRY();
+
+        /*
+         * We will invoke a global notify handler if installed. This is done
+         * _before_ we invoke the per-device handler attached to the device.
+         */
+        if (notify_info->notify.value <= ACPI_MAX_SYS_NOTIFY) {
+
+                /* Global system notification handler */
+
+                if (acpi_gbl_system_notify.handler) {
+                        global_handler = acpi_gbl_system_notify.handler;
+                        global_context = acpi_gbl_system_notify.context;
+                }
+        } else {
+                /* Global driver notification handler */
+
+                if (acpi_gbl_device_notify.handler) {
+                        global_handler = acpi_gbl_device_notify.handler;
+                        global_context = acpi_gbl_device_notify.context;
+                }
+        }
+
+        /* Invoke the system handler first, if present */
+
+        if (global_handler) {
+                global_handler(notify_info->notify.node,
+                               notify_info->notify.value, global_context);
+        }
+
+        /* Now invoke the per-device handler, if present */
+
+        handler_obj = notify_info->notify.handler_obj;
+        if (handler_obj) {
+                handler_obj->notify.handler(notify_info->notify.node,
+                                            notify_info->notify.value,
+                                            handler_obj->notify.context);
+        }
+
+        /* All done with the info object */
+
+        acpi_ut_delete_generic_state(notify_info);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_global_lock_handler
+ *
+ * PARAMETERS:  Context         - From thread interface, not used
+ *
+ * RETURN:      ACPI_INTERRUPT_HANDLED
+ *
+ * DESCRIPTION: Invoked directly from the SCI handler when a global lock
+ *              release interrupt occurs. Attempt to acquire the global lock,
+ *              if successful, signal the thread waiting for the lock.
+ *
+ * NOTE: Assumes that the semaphore can be signaled from interrupt level. If
+ * this is not possible for some reason, a separate thread will have to be
+ * scheduled to do this.
+ *
+ ******************************************************************************/
+
+static u32 acpi_ev_global_lock_handler(void *context)
+{
+        u8 acquired = FALSE;
+
+        /*
+         * Attempt to get the lock.
+         *
+         * If we don't get it now, it will be marked pending and we will
+         * take another interrupt when it becomes free.
+         */
+        ACPI_ACQUIRE_GLOBAL_LOCK(acpi_gbl_FACS, acquired);
+        if (acquired) {
+
+                /* Got the lock, now wake all threads waiting for it */
+
+                acpi_gbl_global_lock_acquired = TRUE;
+                /* Send a unit to the semaphore */
+
+                if (ACPI_FAILURE
+                    (acpi_os_signal_semaphore
+                     (acpi_gbl_global_lock_semaphore, 1))) {
+                        ACPI_ERROR((AE_INFO,
+                                    "Could not signal Global Lock semaphore"));
+                }
+        }
+
+        return (ACPI_INTERRUPT_HANDLED);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_init_global_lock_handler
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Install a handler for the global lock release event
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ev_init_global_lock_handler(void)
+{
+        acpi_status status;
+
+        ACPI_FUNCTION_TRACE(ev_init_global_lock_handler);
+
+        /* Attempt installation of the global lock handler */
+
+        status = acpi_install_fixed_event_handler(ACPI_EVENT_GLOBAL,
+                                                  acpi_ev_global_lock_handler,
+                                                  NULL);
+
+        /*
+         * If the global lock does not exist on this platform, the attempt to
+         * enable GBL_STATUS will fail (the GBL_ENABLE bit will not stick).
+         * Map to AE_OK, but mark global lock as not present. Any attempt to
+         * actually use the global lock will be flagged with an error.
+         */
+        if (status == AE_NO_HARDWARE_RESPONSE) {
+                ACPI_ERROR((AE_INFO,
+                            "No response from Global Lock hardware, disabling lock"));
+
+                acpi_gbl_global_lock_present = FALSE;
+                return_ACPI_STATUS(AE_OK);
+        }
+
+        acpi_gbl_global_lock_present = TRUE;
+        return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_remove_global_lock_handler
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Remove the handler for the Global Lock
+ *
+ ******************************************************************************/
+
+static acpi_status acpi_ev_remove_global_lock_handler(void)
+{
+        acpi_status status;
+
+        ACPI_FUNCTION_TRACE(ev_remove_global_lock_handler);
+
+        acpi_gbl_global_lock_present = FALSE;
+        status = acpi_remove_fixed_event_handler(ACPI_EVENT_GLOBAL,
+                                                 acpi_ev_global_lock_handler);
+
+        return_ACPI_STATUS(status);
+}
+
+/******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_acquire_global_lock
+ *
+ * PARAMETERS:  Timeout         - Max time to wait for the lock, in millisec.
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Attempt to gain ownership of the Global Lock.
+ *
+ * MUTEX:       Interpreter must be locked
+ *
+ * Note: The original implementation allowed multiple threads to "acquire" the
+ * Global Lock, and the OS would hold the lock until the last thread had
+ * released it. However, this could potentially starve the BIOS out of the
+ * lock, especially in the case where there is a tight handshake between the
+ * Embedded Controller driver and the BIOS. Therefore, this implementation
+ * allows only one thread to acquire the HW Global Lock at a time, and makes
+ * the global lock appear as a standard mutex on the OS side.
+ *
+ *****************************************************************************/
+static acpi_thread_id acpi_ev_global_lock_thread_id;
+static int acpi_ev_global_lock_acquired;
+
+acpi_status acpi_ev_acquire_global_lock(u16 timeout)
+{
+        acpi_status status = AE_OK;
+        u8 acquired = FALSE;
+
+        ACPI_FUNCTION_TRACE(ev_acquire_global_lock);
+
+        /*
+         * Only one thread can acquire the GL at a time, the global_lock_mutex
+         * enforces this. This interface releases the interpreter if we must wait.
+         */
+        status = acpi_ex_system_wait_mutex(
+                        acpi_gbl_global_lock_mutex->mutex.os_mutex, 0);
+        if (status == AE_TIME) {
+                if (acpi_ev_global_lock_thread_id == acpi_os_get_thread_id()) {
+                        acpi_ev_global_lock_acquired++;
+                        return AE_OK;
+                }
+        }
+
+        if (ACPI_FAILURE(status)) {
+                status = acpi_ex_system_wait_mutex(
+                                acpi_gbl_global_lock_mutex->mutex.os_mutex,
+                                timeout);
+        }
+        if (ACPI_FAILURE(status)) {
+                return_ACPI_STATUS(status);
+        }
+
+        acpi_ev_global_lock_thread_id = acpi_os_get_thread_id();
+        acpi_ev_global_lock_acquired++;
+
+        /*
+         * Update the global lock handle and check for wraparound. The handle is
+         * only used for the external global lock interfaces, but it is updated
+         * here to properly handle the case where a single thread may acquire the
+         * lock via both the AML and the acpi_acquire_global_lock interfaces. The
+         * handle is therefore updated on the first acquire from a given thread
+         * regardless of where the acquisition request originated.
+         */
+        acpi_gbl_global_lock_handle++;
+        if (acpi_gbl_global_lock_handle == 0) {
+                acpi_gbl_global_lock_handle = 1;
+        }
+
+        /*
+         * Make sure that a global lock actually exists. If not, just treat the
+         * lock as a standard mutex.
+         */
+        if (!acpi_gbl_global_lock_present) {
+                acpi_gbl_global_lock_acquired = TRUE;
+                return_ACPI_STATUS(AE_OK);
+        }
+
+        /* Attempt to acquire the actual hardware lock */
+
+        ACPI_ACQUIRE_GLOBAL_LOCK(acpi_gbl_FACS, acquired);
+        if (acquired) {
+
+                /* We got the lock */
+
+                ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+                                  "Acquired hardware Global Lock\n"));
+
+                acpi_gbl_global_lock_acquired = TRUE;
+                return_ACPI_STATUS(AE_OK);
+        }
+
+        /*
+         * Did not get the lock. The pending bit was set above, and we must now
+         * wait until we get the global lock released interrupt.
+         */
+        ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Waiting for hardware Global Lock\n"));
+
+        /*
+         * Wait for handshake with the global lock interrupt handler.
+         * This interface releases the interpreter if we must wait.
+         */
+        status = acpi_ex_system_wait_semaphore(acpi_gbl_global_lock_semaphore,
+                                               ACPI_WAIT_FOREVER);
+
+        return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_release_global_lock
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Releases ownership of the Global Lock.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ev_release_global_lock(void)
+{
+        u8 pending = FALSE;
+        acpi_status status = AE_OK;
+
+        ACPI_FUNCTION_TRACE(ev_release_global_lock);
+
+        /* Lock must be already acquired */
+
+        if (!acpi_gbl_global_lock_acquired) {
+                ACPI_WARNING((AE_INFO,
+                              "Cannot release the ACPI Global Lock, it has not been acquired"));
+                return_ACPI_STATUS(AE_NOT_ACQUIRED);
+        }
+
+        acpi_ev_global_lock_acquired--;
+        if (acpi_ev_global_lock_acquired > 0) {
+                return AE_OK;
+        }
+
+        if (acpi_gbl_global_lock_present) {
+
+                /* Allow any thread to release the lock */
+
+                ACPI_RELEASE_GLOBAL_LOCK(acpi_gbl_FACS, pending);
+
+                /*
+                 * If the pending bit was set, we must write GBL_RLS to the control
+                 * register
+                 */
+                if (pending) {
+                        status =
+                            acpi_set_register(ACPI_BITREG_GLOBAL_LOCK_RELEASE,
+                                              1);
+                }
+
+                ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+                                  "Released hardware Global Lock\n"));
+        }
+
+        acpi_gbl_global_lock_acquired = FALSE;
+
+        /* Release the local GL mutex */
+        acpi_ev_global_lock_thread_id = NULL;
+        acpi_ev_global_lock_acquired = 0;
+        acpi_os_release_mutex(acpi_gbl_global_lock_mutex->mutex.os_mutex);
+        return_ACPI_STATUS(status);
+}
+
+/******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_terminate
+ *
+ * PARAMETERS:  none
+ *
+ * RETURN:      none
+ *
+ * DESCRIPTION: Disable events and free memory allocated for table storage.
+ *
+ ******************************************************************************/
+
+void acpi_ev_terminate(void)
+{
+        u32 i;
+        acpi_status status;
+
+        ACPI_FUNCTION_TRACE(ev_terminate);
+
+        if (acpi_gbl_events_initialized) {
+                /*
+                 * Disable all event-related functionality. In all cases, on error,
+                 * print a message but obviously we don't abort.
+                 */
+
+                /* Disable all fixed events */
+
+                for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
+                        status = acpi_disable_event(i, 0);
+                        if (ACPI_FAILURE(status)) {
+                                ACPI_ERROR((AE_INFO,
+                                            "Could not disable fixed event %d",
+                                            (u32) i));
+                        }
+                }
+
+                /* Disable all GPEs in all GPE blocks */
+
+                status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block, NULL);
+
+                /* Remove SCI handler */
+
+                status = acpi_ev_remove_sci_handler();
+                if (ACPI_FAILURE(status)) {
+                        ACPI_ERROR((AE_INFO, "Could not remove SCI handler"));
+                }
+
+                status = acpi_ev_remove_global_lock_handler();
+                if (ACPI_FAILURE(status)) {
+                        ACPI_ERROR((AE_INFO,
+                                    "Could not remove Global Lock handler"));
+                }
+        }
+
+        /* Deallocate all handler objects installed within GPE info structs */
+
+        status = acpi_ev_walk_gpe_list(acpi_ev_delete_gpe_handlers, NULL);
+
+        /* Return to original mode if necessary */
+
+        if (acpi_gbl_original_mode == ACPI_SYS_MODE_LEGACY) {
+                status = acpi_disable();
+                if (ACPI_FAILURE(status)) {
+                        ACPI_WARNING((AE_INFO, "AcpiDisable failed"));
+                }
+        }
+        return_VOID;
+}