/*******************************************************************************
   *
   * Module Name: evsci - System Control Interrupt configuration and
   *                      legacy to ACPI mode state transition functions
   *
   ******************************************************************************/
  
  /*
   * Copyright (C) 2000 - 2013, 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"
  
  #define _COMPONENT          ACPI_EVENTS
  ACPI_MODULE_NAME("evsci")
  #if (!ACPI_REDUCED_HARDWARE)	/* Entire module */
  /* Local prototypes */
  static u32 ACPI_SYSTEM_XFACE acpi_ev_sci_xrupt_handler(void *context);
  
  /*******************************************************************************
   *
   * FUNCTION:    acpi_ev_sci_dispatch
   *
   * PARAMETERS:  None
   *
   * RETURN:      Status code indicates whether interrupt was handled.
   *
   * DESCRIPTION: Dispatch the SCI to all host-installed SCI handlers.
   *
   ******************************************************************************/
  
  u32 acpi_ev_sci_dispatch(void)
  {
  	struct acpi_sci_handler_info *sci_handler;
  	acpi_cpu_flags flags;
  	u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
  
  	ACPI_FUNCTION_NAME(ev_sci_dispatch);
  
  	/* Are there any host-installed SCI handlers? */
  
  	if (!acpi_gbl_sci_handler_list) {
  		return (int_status);
  	}
  
  	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
  
  	/* Invoke all host-installed SCI handlers */
  
  	sci_handler = acpi_gbl_sci_handler_list;
  	while (sci_handler) {
  
  		/* Invoke the installed handler (at interrupt level) */
  
  		int_status |= sci_handler->address(sci_handler->context);
  
  		sci_handler = sci_handler->next;
  	}
  
  	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
  	return (int_status);
  }
  
  /*******************************************************************************
   *
   * FUNCTION:    acpi_ev_sci_xrupt_handler
   *
   * PARAMETERS:  context   - Calling Context
   *
   * RETURN:      Status code indicates whether interrupt was handled.
   *
   * DESCRIPTION: Interrupt handler that will figure out what function or
   *              control method to call to deal with a SCI.
   *
   ******************************************************************************/
  
  static u32 ACPI_SYSTEM_XFACE acpi_ev_sci_xrupt_handler(void *context)
  {
  	struct acpi_gpe_xrupt_info *gpe_xrupt_list = context;
  	u32 interrupt_handled = ACPI_INTERRUPT_NOT_HANDLED;
  
  	ACPI_FUNCTION_TRACE(ev_sci_xrupt_handler);
  
  	/*
  	 * We are guaranteed by the ACPI CA initialization/shutdown code that
  	 * if this interrupt handler is installed, ACPI is enabled.
  	 */
  
  	/*
  	 * Fixed Events:
  	 * Check for and dispatch any Fixed Events that have occurred
  	 */
  	interrupt_handled |= acpi_ev_fixed_event_detect();
  
  	/*
  	 * General Purpose Events:
  	 * Check for and dispatch any GPEs that have occurred
  	 */
  	interrupt_handled |= acpi_ev_gpe_detect(gpe_xrupt_list);
  
  	/* Invoke all host-installed SCI handlers */
  
  	interrupt_handled |= acpi_ev_sci_dispatch();
  
  	acpi_sci_count++;
  	return_UINT32(interrupt_handled);
  }
  
  /*******************************************************************************
   *
   * FUNCTION:    acpi_ev_gpe_xrupt_handler
   *
   * PARAMETERS:  context   - Calling Context
   *
   * RETURN:      Status code indicates whether interrupt was handled.
   *
   * DESCRIPTION: Handler for GPE Block Device interrupts
   *
   ******************************************************************************/
  
  u32 ACPI_SYSTEM_XFACE acpi_ev_gpe_xrupt_handler(void *context)
  {
  	struct acpi_gpe_xrupt_info *gpe_xrupt_list = context;
  	u32 interrupt_handled = ACPI_INTERRUPT_NOT_HANDLED;
  
  	ACPI_FUNCTION_TRACE(ev_gpe_xrupt_handler);
  
  	/*
  	 * We are guaranteed by the ACPICA initialization/shutdown code that
  	 * if this interrupt handler is installed, ACPI is enabled.
  	 */
  
  	/* GPEs: Check for and dispatch any GPEs that have occurred */
  
  	interrupt_handled |= acpi_ev_gpe_detect(gpe_xrupt_list);
  	return_UINT32(interrupt_handled);
  }
  
  /******************************************************************************
   *
   * FUNCTION:    acpi_ev_install_sci_handler
   *
   * PARAMETERS:  none
   *
   * RETURN:      Status
   *
   * DESCRIPTION: Installs SCI handler.
   *
   ******************************************************************************/
  
  u32 acpi_ev_install_sci_handler(void)
  {
  	u32 status = AE_OK;
  
  	ACPI_FUNCTION_TRACE(ev_install_sci_handler);
  
  	status =
  	    acpi_os_install_interrupt_handler((u32) acpi_gbl_FADT.sci_interrupt,
  					      acpi_ev_sci_xrupt_handler,
  					      acpi_gbl_gpe_xrupt_list_head);
  	return_ACPI_STATUS(status);
  }
  
  /******************************************************************************
   *
   * FUNCTION:    acpi_ev_remove_all_sci_handlers
   *
   * PARAMETERS:  none
   *
   * RETURN:      AE_OK if handler uninstalled, AE_ERROR if handler was not
   *              installed to begin with
   *
   * DESCRIPTION: Remove the SCI interrupt handler. No further SCIs will be
   *              taken. Remove all host-installed SCI handlers.
   *
   * Note:  It doesn't seem important to disable all events or set the event
   *        enable registers to their original values. The OS should disable
   *        the SCI interrupt level when the handler is removed, so no more
   *        events will come in.
   *
   ******************************************************************************/
  
  acpi_status acpi_ev_remove_all_sci_handlers(void)
  {
  	struct acpi_sci_handler_info *sci_handler;
  	acpi_cpu_flags flags;
  	acpi_status status;
  
  	ACPI_FUNCTION_TRACE(ev_remove_all_sci_handlers);
  
  	/* Just let the OS remove the handler and disable the level */
  
  	status =
  	    acpi_os_remove_interrupt_handler((u32) acpi_gbl_FADT.sci_interrupt,
  					     acpi_ev_sci_xrupt_handler);
  
  	if (!acpi_gbl_sci_handler_list) {
  		return (status);
  	}
  
  	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
  
  	/* Free all host-installed SCI handlers */
  
  	while (acpi_gbl_sci_handler_list) {
  		sci_handler = acpi_gbl_sci_handler_list;
  		acpi_gbl_sci_handler_list = sci_handler->next;
  		ACPI_FREE(sci_handler);
  	}
  
  	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
  	return_ACPI_STATUS(status);
  }
  
  #endif				/* !ACPI_REDUCED_HARDWARE */