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evevent.c

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

/*
 * Copyright (C) 2000 - 2007, R. Byron Moore
 * 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 <acpi/acevents.h>

#define _COMPONENT          ACPI_EVENTS
ACPI_MODULE_NAME("evevent")

/* 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);

      /*
       * 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_fadt_gpes
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Completes initialization of the FADT-defined GPE blocks
 *              (0 and 1). This causes the _PRW methods to be run, so the HW
 *              must be fully initialized at this point, including global lock
 *              support.
 *
 ******************************************************************************/

acpi_status acpi_ev_install_fadt_gpes(void)
{
      acpi_status status;

      ACPI_FUNCTION_TRACE(ev_install_fadt_gpes);

      /* Namespace must be locked */

      status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
      if (ACPI_FAILURE(status)) {
            return (status);
      }

      /* FADT GPE Block 0 */

      (void)acpi_ev_initialize_gpe_block(acpi_gbl_fadt_gpe_device,
                                 acpi_gbl_gpe_fadt_blocks[0]);

      /* FADT GPE Block 1 */

      (void)acpi_ev_initialize_gpe_block(acpi_gbl_fadt_gpe_device,
                                 acpi_gbl_gpe_fadt_blocks[1]);

      (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
      return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * 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);

      /* 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 enable the fixed events.
 *
 ******************************************************************************/

static acpi_status acpi_ev_fixed_event_initialize(void)
{
      acpi_native_uint 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;

            /* Enable the fixed event */

            if (acpi_gbl_fixed_event_info[i].enable_register_id != 0xFF) {
                  status =
                      acpi_set_register(acpi_gbl_fixed_event_info[i].
                                    enable_register_id, 0);
                  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;
      acpi_native_uint 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 */

                  int_status |= acpi_ev_fixed_event_dispatch((u32) 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.
 *
 ******************************************************************************/

static u32 acpi_ev_fixed_event_dispatch(u32 event)
{

      ACPI_FUNCTION_ENTRY();

      /* Clear the status bit */

      (void)acpi_set_register(acpi_gbl_fixed_event_info[event].
                        status_register_id, 1);

      /*
       * Make sure we've got a handler.  If not, report an error.
       * The event is disabled to prevent further interrupts.
       */
      if (NULL == acpi_gbl_fixed_event_handlers[event].handler) {
            (void)acpi_set_register(acpi_gbl_fixed_event_info[event].
                              enable_register_id, 0);

            ACPI_ERROR((AE_INFO,
                      "No installed handler for fixed event [%08X]",
                      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));
}

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