drivers/acpi/acpica/evevent.c - maze/linux - Git at Google

 /******************************************************************************
  *
  * Module Name: evevent - Fixed Event handling and dispatch
  *
  *****************************************************************************/

 /*
  * 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("evevent")
 #if (!ACPI_REDUCED_HARDWARE)	/* Entire module */
 /* Local prototypes */
 static acpi_status acpi_ev_fixed_event_initialize(void);

 static u32 acpi_ev_fixed_event_dispatch(u32 event);

 /*******************************************************************************
  *
  * FUNCTION:    acpi_ev_initialize_events
  *
  * PARAMETERS:  None
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Initialize global data structures for ACPI events (Fixed, GPE)
  *
  ******************************************************************************/

 acpi_status acpi_ev_initialize_events(void)
 {
 	acpi_status status;

 	ACPI_FUNCTION_TRACE(ev_initialize_events);

 	/* If Hardware Reduced flag is set, there are no fixed events */

 	if (acpi_gbl_reduced_hardware) {
 		return_ACPI_STATUS(AE_OK);
 	}

 	/*
 	 * Initialize the Fixed and General Purpose Events. This is done prior to
 	 * enabling SCIs to prevent interrupts from occurring before the handlers
 	 * are installed.
 	 */
 	status = acpi_ev_fixed_event_initialize();
 	if (ACPI_FAILURE(status)) {
 		ACPI_EXCEPTION((AE_INFO, status,
 				"Unable to initialize fixed events"));
 		return_ACPI_STATUS(status);
 	}

 	status = acpi_ev_gpe_initialize();
 	if (ACPI_FAILURE(status)) {
 		ACPI_EXCEPTION((AE_INFO, status,
 				"Unable to initialize general purpose events"));
 		return_ACPI_STATUS(status);
 	}

 	return_ACPI_STATUS(status);
 }

 /*******************************************************************************
  *
  * FUNCTION:    acpi_ev_install_xrupt_handlers
  *
  * PARAMETERS:  None
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Install interrupt handlers for the SCI and Global Lock
  *
  ******************************************************************************/

 acpi_status acpi_ev_install_xrupt_handlers(void)
 {
 	acpi_status status;

 	ACPI_FUNCTION_TRACE(ev_install_xrupt_handlers);

 	/* If Hardware Reduced flag is set, there is no ACPI h/w */

 	if (acpi_gbl_reduced_hardware) {
 		return_ACPI_STATUS(AE_OK);
 	}

 	/* Install the SCI handler */

 	status = acpi_ev_install_sci_handler();
 	if (ACPI_FAILURE(status)) {
 		ACPI_EXCEPTION((AE_INFO, status,
 				"Unable to install System Control Interrupt handler"));
 		return_ACPI_STATUS(status);
 	}

 	/* Install the handler for the Global Lock */

 	status = acpi_ev_init_global_lock_handler();
 	if (ACPI_FAILURE(status)) {
 		ACPI_EXCEPTION((AE_INFO, status,
 				"Unable to initialize Global Lock handler"));
 		return_ACPI_STATUS(status);
 	}

 	acpi_gbl_events_initialized = TRUE;
 	return_ACPI_STATUS(status);
 }

 /*******************************************************************************
  *
  * FUNCTION:    acpi_ev_fixed_event_initialize
  *
  * PARAMETERS:  None
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Install the fixed event handlers and disable all fixed events.
  *
  ******************************************************************************/

 static acpi_status acpi_ev_fixed_event_initialize(void)
 {
 	u32 i;
 	acpi_status status;

 	/*
 	 * Initialize the structure that keeps track of fixed event handlers and
 	 * enable the fixed events.
 	 */
 	for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
 		acpi_gbl_fixed_event_handlers[i].handler = NULL;
 		acpi_gbl_fixed_event_handlers[i].context = NULL;

 		/* Disable the fixed event */

 		if (acpi_gbl_fixed_event_info[i].enable_register_id != 0xFF) {
 			status =
 			    acpi_write_bit_register(acpi_gbl_fixed_event_info
 						    [i].enable_register_id,
 						    ACPI_DISABLE_EVENT);
 			if (ACPI_FAILURE(status)) {
 				return (status);
 			}
 		}
 	}

 	return (AE_OK);
 }

 /*******************************************************************************
  *
  * FUNCTION:    acpi_ev_fixed_event_detect
  *
  * PARAMETERS:  None
  *
  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
  *
  * DESCRIPTION: Checks the PM status register for active fixed events
  *
  ******************************************************************************/

 u32 acpi_ev_fixed_event_detect(void)
 {
 	u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
 	u32 fixed_status;
 	u32 fixed_enable;
 	u32 i;

 	ACPI_FUNCTION_NAME(ev_fixed_event_detect);

 	/*
 	 * Read the fixed feature status and enable registers, as all the cases
 	 * depend on their values. Ignore errors here.
 	 */
 	(void)acpi_hw_register_read(ACPI_REGISTER_PM1_STATUS, &fixed_status);
 	(void)acpi_hw_register_read(ACPI_REGISTER_PM1_ENABLE, &fixed_enable);

 	ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
 			  "Fixed Event Block: Enable %08X Status %08X\n",
 			  fixed_enable, fixed_status));

 	/*
 	 * Check for all possible Fixed Events and dispatch those that are active
 	 */
 	for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {

 		/* Both the status and enable bits must be on for this event */

 		if ((fixed_status & acpi_gbl_fixed_event_info[i].
 		     status_bit_mask)
 		    && (fixed_enable & acpi_gbl_fixed_event_info[i].
 			enable_bit_mask)) {
 			/*
 			 * Found an active (signalled) event. Invoke global event
 			 * handler if present.
 			 */
 			acpi_fixed_event_count[i]++;
 			if (acpi_gbl_global_event_handler) {
 				acpi_gbl_global_event_handler
 				    (ACPI_EVENT_TYPE_FIXED, NULL, i,
 				     acpi_gbl_global_event_handler_context);
 			}

 			int_status |= acpi_ev_fixed_event_dispatch(i);
 		}
 	}

 	return (int_status);
 }

 /*******************************************************************************
  *
  * FUNCTION:    acpi_ev_fixed_event_dispatch
  *
  * PARAMETERS:  event               - Event type
  *
  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
  *
  * DESCRIPTION: Clears the status bit for the requested event, calls the
  *              handler that previously registered for the event.
  *              NOTE: If there is no handler for the event, the event is
  *              disabled to prevent further interrupts.
  *
  ******************************************************************************/

 static u32 acpi_ev_fixed_event_dispatch(u32 event)
 {

 	ACPI_FUNCTION_ENTRY();

 	/* Clear the status bit */

 	(void)acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
 				      status_register_id, ACPI_CLEAR_STATUS);

 	/*
 	 * Make sure that a handler exists. If not, report an error
 	 * and disable the event to prevent further interrupts.
 	 */
 	if (!acpi_gbl_fixed_event_handlers[event].handler) {
 		(void)acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
 					      enable_register_id,
 					      ACPI_DISABLE_EVENT);

 		ACPI_ERROR((AE_INFO,
 			    "No installed handler for fixed event - %s (%u), disabling",
 			    acpi_ut_get_event_name(event), event));

 		return (ACPI_INTERRUPT_NOT_HANDLED);
 	}

 	/* Invoke the Fixed Event handler */

 	return ((acpi_gbl_fixed_event_handlers[event].
 		 handler) (acpi_gbl_fixed_event_handlers[event].context));
 }

 #endif				/* !ACPI_REDUCED_HARDWARE */
	/******************************************************************************
	*
	* Module Name: evevent - Fixed Event handling and dispatch
	*
	*****************************************************************************/

	/*
	* 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("evevent")
	#if (!ACPI_REDUCED_HARDWARE) /* Entire module */
	/* Local prototypes */
	static acpi_status acpi_ev_fixed_event_initialize(void);

	static u32 acpi_ev_fixed_event_dispatch(u32 event);

	/*******************************************************************************
	*
	* FUNCTION: acpi_ev_initialize_events
	*
	* PARAMETERS: None
	*
	* RETURN: Status
	*
	* DESCRIPTION: Initialize global data structures for ACPI events (Fixed, GPE)
	*
	******************************************************************************/

	acpi_status acpi_ev_initialize_events(void)
	{
	acpi_status status;

	ACPI_FUNCTION_TRACE(ev_initialize_events);

	/* If Hardware Reduced flag is set, there are no fixed events */

	if (acpi_gbl_reduced_hardware) {
	return_ACPI_STATUS(AE_OK);
	}

	/*
	* Initialize the Fixed and General Purpose Events. This is done prior to
	* enabling SCIs to prevent interrupts from occurring before the handlers
	* are installed.
	*/
	status = acpi_ev_fixed_event_initialize();
	if (ACPI_FAILURE(status)) {
	ACPI_EXCEPTION((AE_INFO, status,
	"Unable to initialize fixed events"));
	return_ACPI_STATUS(status);
	}

	status = acpi_ev_gpe_initialize();
	if (ACPI_FAILURE(status)) {
	ACPI_EXCEPTION((AE_INFO, status,
	"Unable to initialize general purpose events"));
	return_ACPI_STATUS(status);
	}

	return_ACPI_STATUS(status);
	}

	/*******************************************************************************
	*
	* FUNCTION: acpi_ev_install_xrupt_handlers
	*
	* PARAMETERS: None
	*
	* RETURN: Status
	*
	* DESCRIPTION: Install interrupt handlers for the SCI and Global Lock
	*
	******************************************************************************/

	acpi_status acpi_ev_install_xrupt_handlers(void)
	{
	acpi_status status;

	ACPI_FUNCTION_TRACE(ev_install_xrupt_handlers);

	/* If Hardware Reduced flag is set, there is no ACPI h/w */

	if (acpi_gbl_reduced_hardware) {
	return_ACPI_STATUS(AE_OK);
	}

	/* Install the SCI handler */

	status = acpi_ev_install_sci_handler();
	if (ACPI_FAILURE(status)) {
	ACPI_EXCEPTION((AE_INFO, status,
	"Unable to install System Control Interrupt handler"));
	return_ACPI_STATUS(status);
	}

	/* Install the handler for the Global Lock */

	status = acpi_ev_init_global_lock_handler();
	if (ACPI_FAILURE(status)) {
	ACPI_EXCEPTION((AE_INFO, status,
	"Unable to initialize Global Lock handler"));
	return_ACPI_STATUS(status);
	}

	acpi_gbl_events_initialized = TRUE;
	return_ACPI_STATUS(status);
	}

	/*******************************************************************************
	*
	* FUNCTION: acpi_ev_fixed_event_initialize
	*
	* PARAMETERS: None
	*
	* RETURN: Status
	*
	* DESCRIPTION: Install the fixed event handlers and disable all fixed events.
	*
	******************************************************************************/

	static acpi_status acpi_ev_fixed_event_initialize(void)
	{
	u32 i;
	acpi_status status;

	/*
	* Initialize the structure that keeps track of fixed event handlers and
	* enable the fixed events.
	*/
	for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
	acpi_gbl_fixed_event_handlers[i].handler = NULL;
	acpi_gbl_fixed_event_handlers[i].context = NULL;

	/* Disable the fixed event */

	if (acpi_gbl_fixed_event_info[i].enable_register_id != 0xFF) {
	status =
	acpi_write_bit_register(acpi_gbl_fixed_event_info
	[i].enable_register_id,
	ACPI_DISABLE_EVENT);
	if (ACPI_FAILURE(status)) {
	return (status);
	}
	}
	}

	return (AE_OK);
	}

	/*******************************************************************************
	*
	* FUNCTION: acpi_ev_fixed_event_detect
	*
	* PARAMETERS: None
	*
	* RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
	*
	* DESCRIPTION: Checks the PM status register for active fixed events
	*
	******************************************************************************/

	u32 acpi_ev_fixed_event_detect(void)
	{
	u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
	u32 fixed_status;
	u32 fixed_enable;
	u32 i;

	ACPI_FUNCTION_NAME(ev_fixed_event_detect);

	/*
	* Read the fixed feature status and enable registers, as all the cases
	* depend on their values. Ignore errors here.
	*/
	(void)acpi_hw_register_read(ACPI_REGISTER_PM1_STATUS, &fixed_status);
	(void)acpi_hw_register_read(ACPI_REGISTER_PM1_ENABLE, &fixed_enable);

	ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
	"Fixed Event Block: Enable %08X Status %08X\n",
	fixed_enable, fixed_status));

	/*
	* Check for all possible Fixed Events and dispatch those that are active
	*/
	for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {

	/* Both the status and enable bits must be on for this event */

	if ((fixed_status & acpi_gbl_fixed_event_info[i].
	status_bit_mask)
	&& (fixed_enable & acpi_gbl_fixed_event_info[i].
	enable_bit_mask)) {
	/*
	* Found an active (signalled) event. Invoke global event
	* handler if present.
	*/
	acpi_fixed_event_count[i]++;
	if (acpi_gbl_global_event_handler) {
	acpi_gbl_global_event_handler
	(ACPI_EVENT_TYPE_FIXED, NULL, i,
	acpi_gbl_global_event_handler_context);
	}

	int_status \|= acpi_ev_fixed_event_dispatch(i);
	}
	}

	return (int_status);
	}

	/*******************************************************************************
	*
	* FUNCTION: acpi_ev_fixed_event_dispatch
	*
	* PARAMETERS: event - Event type
	*
	* RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
	*
	* DESCRIPTION: Clears the status bit for the requested event, calls the
	* handler that previously registered for the event.
	* NOTE: If there is no handler for the event, the event is
	* disabled to prevent further interrupts.
	*
	******************************************************************************/

	static u32 acpi_ev_fixed_event_dispatch(u32 event)
	{

	ACPI_FUNCTION_ENTRY();

	/* Clear the status bit */

	(void)acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
	status_register_id, ACPI_CLEAR_STATUS);

	/*
	* Make sure that a handler exists. If not, report an error
	* and disable the event to prevent further interrupts.
	*/
	if (!acpi_gbl_fixed_event_handlers[event].handler) {
	(void)acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
	enable_register_id,
	ACPI_DISABLE_EVENT);

	ACPI_ERROR((AE_INFO,
	"No installed handler for fixed event - %s (%u), disabling",
	acpi_ut_get_event_name(event), event));

	return (ACPI_INTERRUPT_NOT_HANDLED);
	}

	/* Invoke the Fixed Event handler */

	return ((acpi_gbl_fixed_event_handlers[event].
	handler) (acpi_gbl_fixed_event_handlers[event].context));
	}

	#endif /* !ACPI_REDUCED_HARDWARE */