/****************************************************************************** * * Module Name: evmisc - ACPI device notification handler dispatch * and ACPI Global Lock support * $Revision: 1.1.1.1 $ * *****************************************************************************/ /* * Copyright (C) 2000, 2001 R. Byron Moore * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "acpi.h" #include "acevents.h" #include "acnamesp.h" #include "acinterp.h" #include "achware.h" #define _COMPONENT ACPI_EVENTS MODULE_NAME ("evmisc") /******************************************************************************* * * FUNCTION: Acpi_ev_queue_notify_request * * PARAMETERS: * * RETURN: None. * * DESCRIPTION: Dispatch a device notification event to a previously * installed handler. * ******************************************************************************/ acpi_status acpi_ev_queue_notify_request ( acpi_namespace_node *node, u32 notify_value) { acpi_operand_object *obj_desc; acpi_operand_object *handler_obj = NULL; acpi_generic_state *notify_info; acpi_status status = AE_OK; PROC_NAME ("Ev_queue_notify_request"); /* * For value 1 (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(%X) on node %p\n", notify_value, node)); switch (notify_value) { case 0: ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Notify value: Re-enumerate Devices\n")); break; case 1: ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Notify value: Ejection Request\n")); break; case 2: ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Notify value: Device Wake\n")); break; case 0x80: ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Notify value: Status Change\n")); break; default: ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Unknown Notify Value: %X \n", notify_value)); break; } /* * Get the notify object attached to the device Node */ obj_desc = acpi_ns_get_attached_object (node); if (obj_desc) { /* We have the notify object, Get the right handler */ switch (node->type) { case ACPI_TYPE_DEVICE: if (notify_value <= MAX_SYS_NOTIFY) { handler_obj = obj_desc->device.sys_handler; } else { handler_obj = obj_desc->device.drv_handler; } break; case ACPI_TYPE_THERMAL: if (notify_value <= MAX_SYS_NOTIFY) { handler_obj = obj_desc->thermal_zone.sys_handler; } else { handler_obj = obj_desc->thermal_zone.drv_handler; } break; } } /* If there is any handler to run, schedule the dispatcher */ if ((acpi_gbl_sys_notify.handler && (notify_value <= MAX_SYS_NOTIFY)) || (acpi_gbl_drv_notify.handler && (notify_value > MAX_SYS_NOTIFY)) || handler_obj) { notify_info = acpi_ut_create_generic_state (); if (!notify_info) { return (AE_NO_MEMORY); } notify_info->common.data_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_queue_for_execution (OSD_PRIORITY_HIGH, acpi_ev_notify_dispatch, notify_info); if (ACPI_FAILURE (status)) { acpi_ut_delete_generic_state (notify_info); } } if (!handler_obj) { /* There is no per-device notify handler for this device */ ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "No notify handler for node %p \n", node)); } return (status); } /******************************************************************************* * * FUNCTION: Acpi_ev_notify_dispatch * * PARAMETERS: * * RETURN: None. * * DESCRIPTION: Dispatch a device notification event to a previously * installed handler. * ******************************************************************************/ void acpi_ev_notify_dispatch ( void *context) { acpi_generic_state *notify_info = (acpi_generic_state *) context; acpi_notify_handler global_handler = NULL; void *global_context = NULL; acpi_operand_object *handler_obj; 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 <= MAX_SYS_NOTIFY) { /* Global system notification handler */ if (acpi_gbl_sys_notify.handler) { global_handler = acpi_gbl_sys_notify.handler; global_context = acpi_gbl_sys_notify.context; } } else { /* Global driver notification handler */ if (acpi_gbl_drv_notify.handler) { global_handler = acpi_gbl_drv_notify.handler; global_context = acpi_gbl_drv_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.handler (notify_info->notify.node, notify_info->notify.value, handler_obj->notify_handler.context); } /* All done with the info object */ acpi_ut_delete_generic_state (notify_info); } /******************************************************************************* * * FUNCTION: Acpi_ev_global_lock_thread * * RETURN: None * * DESCRIPTION: Invoked by SCI interrupt handler upon acquisition of the * Global Lock. Simply signal all threads that are waiting * for the lock. * ******************************************************************************/ static void acpi_ev_global_lock_thread ( void *context) { /* Signal threads that are waiting for the lock */ if (acpi_gbl_global_lock_thread_count) { /* Send sufficient units to the semaphore */ acpi_os_signal_semaphore (acpi_gbl_global_lock_semaphore, acpi_gbl_global_lock_thread_count); } } /******************************************************************************* * * FUNCTION: Acpi_ev_global_lock_handler * * RETURN: Status * * DESCRIPTION: Invoked directly from the SCI handler when a global lock * release interrupt occurs. Grab the global lock and queue * the global lock thread for execution * ******************************************************************************/ static u32 acpi_ev_global_lock_handler ( void *context) { u8 acquired = FALSE; void *global_lock; /* * 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. */ global_lock = acpi_gbl_FACS->global_lock; ACPI_ACQUIRE_GLOBAL_LOCK (global_lock, acquired); if (acquired) { /* Got the lock, now wake all threads waiting for it */ acpi_gbl_global_lock_acquired = TRUE; /* Run the Global Lock thread which will signal all waiting threads */ acpi_os_queue_for_execution (OSD_PRIORITY_HIGH, acpi_ev_global_lock_thread, context); } return (INTERRUPT_HANDLED); } /******************************************************************************* * * FUNCTION: Acpi_ev_init_global_lock_handler * * RETURN: Status * * DESCRIPTION: Install a handler for the global lock release event * ******************************************************************************/ acpi_status acpi_ev_init_global_lock_handler (void) { acpi_status status; FUNCTION_TRACE ("Ev_init_global_lock_handler"); acpi_gbl_global_lock_present = TRUE; 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_STS will fail (the GBL_EN 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_gbl_global_lock_present = FALSE; status = AE_OK; } return_ACPI_STATUS (status); } /****************************************************************************** * * FUNCTION: Acpi_ev_acquire_global_lock * * RETURN: Status * * DESCRIPTION: Attempt to gain ownership of the Global Lock. * *****************************************************************************/ acpi_status acpi_ev_acquire_global_lock(void) { acpi_status status = AE_OK; u8 acquired = FALSE; void *global_lock; FUNCTION_TRACE ("Ev_acquire_global_lock"); /* Make sure that we actually have a global lock */ if (!acpi_gbl_global_lock_present) { return_ACPI_STATUS (AE_NO_GLOBAL_LOCK); } /* One more thread wants the global lock */ acpi_gbl_global_lock_thread_count++; /* If we (OS side) have the hardware lock already, we are done */ if (acpi_gbl_global_lock_acquired) { return_ACPI_STATUS (AE_OK); } /* Only if the FACS is valid */ if (!acpi_gbl_FACS) { return_ACPI_STATUS (AE_OK); } /* We must acquire the actual hardware lock */ global_lock = acpi_gbl_FACS->global_lock; ACPI_ACQUIRE_GLOBAL_LOCK (global_lock, acquired); if (acquired) { /* We got the lock */ ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Acquired the 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_INFO, "Waiting for the HW Global Lock\n")); /* * Acquire the global lock semaphore first. * Since this wait will block, we must release the interpreter */ status = acpi_ex_system_wait_semaphore (acpi_gbl_global_lock_semaphore, ACPI_UINT32_MAX); return_ACPI_STATUS (status); } /******************************************************************************* * * FUNCTION: Acpi_ev_release_global_lock * * DESCRIPTION: Releases ownership of the Global Lock. * ******************************************************************************/ void acpi_ev_release_global_lock (void) { u8 pending = FALSE; void *global_lock; FUNCTION_TRACE ("Ev_release_global_lock"); if (!acpi_gbl_global_lock_thread_count) { REPORT_WARNING(("Global Lock has not be acquired, cannot release\n")); return_VOID; } /* One fewer thread has the global lock */ acpi_gbl_global_lock_thread_count--; /* Have all threads released the lock? */ if (!acpi_gbl_global_lock_thread_count) { /* * No more threads holding lock, we can do the actual hardware * release */ global_lock = acpi_gbl_FACS->global_lock; ACPI_RELEASE_GLOBAL_LOCK (global_lock, pending); acpi_gbl_global_lock_acquired = FALSE; /* * If the pending bit was set, we must write GBL_RLS to the control * register */ if (pending) { acpi_hw_register_bit_access (ACPI_WRITE, ACPI_MTX_LOCK, GBL_RLS, 1); } } return_VOID; }