LXR linux/drivers/acpi/acpica/evsci.c

   1/*******************************************************************************
   2 *
   3 * Module Name: evsci - System Control Interrupt configuration and
   4 *                      legacy to ACPI mode state transition functions
   5 *
   6 ******************************************************************************/
   7
   8/*
   9 * Copyright (C) 2000 - 2008, Intel Corp.
  10 * All rights reserved.
  11 *
  12 * Redistribution and use in source and binary forms, with or without
  13 * modification, are permitted provided that the following conditions
  14 * are met:
  15 * 1. Redistributions of source code must retain the above copyright
  16 *    notice, this list of conditions, and the following disclaimer,
  17 *    without modification.
  18 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19 *    substantially similar to the "NO WARRANTY" disclaimer below
  20 *    ("Disclaimer") and any redistribution must be conditioned upon
  21 *    including a substantially similar Disclaimer requirement for further
  22 *    binary redistribution.
  23 * 3. Neither the names of the above-listed copyright holders nor the names
  24 *    of any contributors may be used to endorse or promote products derived
  25 *    from this software without specific prior written permission.
  26 *
  27 * Alternatively, this software may be distributed under the terms of the
  28 * GNU General Public License ("GPL") version 2 as published by the Free
  29 * Software Foundation.
  30 *
  31 * NO WARRANTY
  32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42 * POSSIBILITY OF SUCH DAMAGES.
  43 */
  44
  45#include <acpi/acpi.h>
  46#include "accommon.h"
  47#include "acevents.h"
  48
  49#define _COMPONENT          ACPI_EVENTS
  50ACPI_MODULE_NAME("evsci")
  51
  52/* Local prototypes */
  53static u32 ACPI_SYSTEM_XFACE acpi_ev_sci_xrupt_handler(void *context);
  54
  55/*******************************************************************************
  56 *
  57 * FUNCTION:    acpi_ev_sci_xrupt_handler
  58 *
  59 * PARAMETERS:  Context   - Calling Context
  60 *
  61 * RETURN:      Status code indicates whether interrupt was handled.
  62 *
  63 * DESCRIPTION: Interrupt handler that will figure out what function or
  64 *              control method to call to deal with a SCI.
  65 *
  66 ******************************************************************************/
  67
  68static u32 ACPI_SYSTEM_XFACE acpi_ev_sci_xrupt_handler(void *context)
  69{
  70        struct acpi_gpe_xrupt_info *gpe_xrupt_list = context;
  71        u32 interrupt_handled = ACPI_INTERRUPT_NOT_HANDLED;
  72
  73        ACPI_FUNCTION_TRACE(ev_sci_xrupt_handler);
  74
  75        /*
  76         * We are guaranteed by the ACPI CA initialization/shutdown code that
  77         * if this interrupt handler is installed, ACPI is enabled.
  78         */
  79
  80        /*
  81         * Fixed Events:
  82         * Check for and dispatch any Fixed Events that have occurred
  83         */
  84        interrupt_handled |= acpi_ev_fixed_event_detect();
  85
  86        /*
  87         * General Purpose Events:
  88         * Check for and dispatch any GPEs that have occurred
  89         */
  90        interrupt_handled |= acpi_ev_gpe_detect(gpe_xrupt_list);
  91
  92        return_UINT32(interrupt_handled);
  93}
  94
  95/*******************************************************************************
  96 *
  97 * FUNCTION:    acpi_ev_gpe_xrupt_handler
  98 *
  99 * PARAMETERS:  Context   - Calling Context
 100 *
 101 * RETURN:      Status code indicates whether interrupt was handled.
 102 *
 103 * DESCRIPTION: Handler for GPE Block Device interrupts
 104 *
 105 ******************************************************************************/
 106
 107u32 ACPI_SYSTEM_XFACE acpi_ev_gpe_xrupt_handler(void *context)
 108{
 109        struct acpi_gpe_xrupt_info *gpe_xrupt_list = context;
 110        u32 interrupt_handled = ACPI_INTERRUPT_NOT_HANDLED;
 111
 112        ACPI_FUNCTION_TRACE(ev_gpe_xrupt_handler);
 113
 114        /*
 115         * We are guaranteed by the ACPI CA initialization/shutdown code that
 116         * if this interrupt handler is installed, ACPI is enabled.
 117         */
 118
 119        /* GPEs: Check for and dispatch any GPEs that have occurred */
 120
 121        interrupt_handled |= acpi_ev_gpe_detect(gpe_xrupt_list);
 122
 123        return_UINT32(interrupt_handled);
 124}
 125
 126/******************************************************************************
 127 *
 128 * FUNCTION:    acpi_ev_install_sci_handler
 129 *
 130 * PARAMETERS:  none
 131 *
 132 * RETURN:      Status
 133 *
 134 * DESCRIPTION: Installs SCI handler.
 135 *
 136 ******************************************************************************/
 137
 138u32 acpi_ev_install_sci_handler(void)
 139{
 140        u32 status = AE_OK;
 141
 142        ACPI_FUNCTION_TRACE(ev_install_sci_handler);
 143
 144        status =
 145            acpi_os_install_interrupt_handler((u32) acpi_gbl_FADT.sci_interrupt,
 146                                              acpi_ev_sci_xrupt_handler,
 147                                              acpi_gbl_gpe_xrupt_list_head);
 148        return_ACPI_STATUS(status);
 149}
 150
 151/******************************************************************************
 152 *
 153 * FUNCTION:    acpi_ev_remove_sci_handler
 154 *
 155 * PARAMETERS:  none
 156 *
 157 * RETURN:      E_OK if handler uninstalled OK, E_ERROR if handler was not
 158 *              installed to begin with
 159 *
 160 * DESCRIPTION: Remove the SCI interrupt handler. No further SCIs will be
 161 *              taken.
 162 *
 163 * Note:  It doesn't seem important to disable all events or set the event
 164 *        enable registers to their original values. The OS should disable
 165 *        the SCI interrupt level when the handler is removed, so no more
 166 *        events will come in.
 167 *
 168 ******************************************************************************/
 169
 170acpi_status acpi_ev_remove_sci_handler(void)
 171{
 172        acpi_status status;
 173
 174        ACPI_FUNCTION_TRACE(ev_remove_sci_handler);
 175
 176        /* Just let the OS remove the handler and disable the level */
 177
 178        status =
 179            acpi_os_remove_interrupt_handler((u32) acpi_gbl_FADT.sci_interrupt,
 180                                             acpi_ev_sci_xrupt_handler);
 181
 182        return_ACPI_STATUS(status);
 183}
 184