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
  50 ACPI_MODULE_NAME("evsci")
  51
  52 /* Local prototypes */
  53 static 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
  68 static 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
 107 u32 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
 138 u32 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
 170 acpi_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 }