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 - 2013, 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 #if (!ACPI_REDUCED_HARDWARE)    /* Entire module */
  52 /* Local prototypes */
  53 static u32 ACPI_SYSTEM_XFACE acpi_ev_sci_xrupt_handler(void *context);
  54
  55 /*******************************************************************************
  56  *
  57  * FUNCTION:    acpi_ev_sci_dispatch
  58  *
  59  * PARAMETERS:  None
  60  *
  61  * RETURN:      Status code indicates whether interrupt was handled.
  62  *
  63  * DESCRIPTION: Dispatch the SCI to all host-installed SCI handlers.
  64  *
  65  ******************************************************************************/
  66
  67 u32 acpi_ev_sci_dispatch(void)
  68 {
  69         struct acpi_sci_handler_info *sci_handler;
  70         acpi_cpu_flags flags;
  71         u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
  72
  73         ACPI_FUNCTION_NAME(ev_sci_dispatch);
  74
  75         /* Are there any host-installed SCI handlers? */
  76
  77         if (!acpi_gbl_sci_handler_list) {
  78                 return (int_status);
  79         }
  80
  81         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
  82
  83         /* Invoke all host-installed SCI handlers */
  84
  85         sci_handler = acpi_gbl_sci_handler_list;
  86         while (sci_handler) {
  87
  88                 /* Invoke the installed handler (at interrupt level) */
  89
  90                 int_status |= sci_handler->address(sci_handler->context);
  91
  92                 sci_handler = sci_handler->next;
  93         }
  94
  95         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
  96         return (int_status);
  97 }
  98
  99 /*******************************************************************************
 100  *
 101  * FUNCTION:    acpi_ev_sci_xrupt_handler
 102  *
 103  * PARAMETERS:  context   - Calling Context
 104  *
 105  * RETURN:      Status code indicates whether interrupt was handled.
 106  *
 107  * DESCRIPTION: Interrupt handler that will figure out what function or
 108  *              control method to call to deal with a SCI.
 109  *
 110  ******************************************************************************/
 111
 112 static u32 ACPI_SYSTEM_XFACE acpi_ev_sci_xrupt_handler(void *context)
 113 {
 114         struct acpi_gpe_xrupt_info *gpe_xrupt_list = context;
 115         u32 interrupt_handled = ACPI_INTERRUPT_NOT_HANDLED;
 116
 117         ACPI_FUNCTION_TRACE(ev_sci_xrupt_handler);
 118
 119         /*
 120          * We are guaranteed by the ACPI CA initialization/shutdown code that
 121          * if this interrupt handler is installed, ACPI is enabled.
 122          */
 123
 124         /*
 125          * Fixed Events:
 126          * Check for and dispatch any Fixed Events that have occurred
 127          */
 128         interrupt_handled |= acpi_ev_fixed_event_detect();
 129
 130         /*
 131          * General Purpose Events:
 132          * Check for and dispatch any GPEs that have occurred
 133          */
 134         interrupt_handled |= acpi_ev_gpe_detect(gpe_xrupt_list);
 135
 136         /* Invoke all host-installed SCI handlers */
 137
 138         interrupt_handled |= acpi_ev_sci_dispatch();
 139
 140         return_UINT32(interrupt_handled);
 141 }
 142
 143 /*******************************************************************************
 144  *
 145  * FUNCTION:    acpi_ev_gpe_xrupt_handler
 146  *
 147  * PARAMETERS:  context   - Calling Context
 148  *
 149  * RETURN:      Status code indicates whether interrupt was handled.
 150  *
 151  * DESCRIPTION: Handler for GPE Block Device interrupts
 152  *
 153  ******************************************************************************/
 154
 155 u32 ACPI_SYSTEM_XFACE acpi_ev_gpe_xrupt_handler(void *context)
 156 {
 157         struct acpi_gpe_xrupt_info *gpe_xrupt_list = context;
 158         u32 interrupt_handled = ACPI_INTERRUPT_NOT_HANDLED;
 159
 160         ACPI_FUNCTION_TRACE(ev_gpe_xrupt_handler);
 161
 162         /*
 163          * We are guaranteed by the ACPICA initialization/shutdown code that
 164          * if this interrupt handler is installed, ACPI is enabled.
 165          */
 166
 167         /* GPEs: Check for and dispatch any GPEs that have occurred */
 168
 169         interrupt_handled |= acpi_ev_gpe_detect(gpe_xrupt_list);
 170         return_UINT32(interrupt_handled);
 171 }
 172
 173 /******************************************************************************
 174  *
 175  * FUNCTION:    acpi_ev_install_sci_handler
 176  *
 177  * PARAMETERS:  none
 178  *
 179  * RETURN:      Status
 180  *
 181  * DESCRIPTION: Installs SCI handler.
 182  *
 183  ******************************************************************************/
 184
 185 u32 acpi_ev_install_sci_handler(void)
 186 {
 187         u32 status = AE_OK;
 188
 189         ACPI_FUNCTION_TRACE(ev_install_sci_handler);
 190
 191         status =
 192             acpi_os_install_interrupt_handler((u32) acpi_gbl_FADT.sci_interrupt,
 193                                               acpi_ev_sci_xrupt_handler,
 194                                               acpi_gbl_gpe_xrupt_list_head);
 195         return_ACPI_STATUS(status);
 196 }
 197
 198 /******************************************************************************
 199  *
 200  * FUNCTION:    acpi_ev_remove_all_sci_handlers
 201  *
 202  * PARAMETERS:  none
 203  *
 204  * RETURN:      AE_OK if handler uninstalled, AE_ERROR if handler was not
 205  *              installed to begin with
 206  *
 207  * DESCRIPTION: Remove the SCI interrupt handler. No further SCIs will be
 208  *              taken. Remove all host-installed SCI handlers.
 209  *
 210  * Note:  It doesn't seem important to disable all events or set the event
 211  *        enable registers to their original values. The OS should disable
 212  *        the SCI interrupt level when the handler is removed, so no more
 213  *        events will come in.
 214  *
 215  ******************************************************************************/
 216
 217 acpi_status acpi_ev_remove_all_sci_handlers(void)
 218 {
 219         struct acpi_sci_handler_info *sci_handler;
 220         acpi_cpu_flags flags;
 221         acpi_status status;
 222
 223         ACPI_FUNCTION_TRACE(ev_remove_all_sci_handlers);
 224
 225         /* Just let the OS remove the handler and disable the level */
 226
 227         status =
 228             acpi_os_remove_interrupt_handler((u32) acpi_gbl_FADT.sci_interrupt,
 229                                              acpi_ev_sci_xrupt_handler);
 230
 231         if (!acpi_gbl_sci_handler_list) {
 232                 return (status);
 233         }
 234
 235         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 236
 237         /* Free all host-installed SCI handlers */
 238
 239         while (acpi_gbl_sci_handler_list) {
 240                 sci_handler = acpi_gbl_sci_handler_list;
 241                 acpi_gbl_sci_handler_list = sci_handler->next;
 242                 ACPI_FREE(sci_handler);
 243         }
 244
 245         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 246         return_ACPI_STATUS(status);
 247 }
 248
 249 #endif                          /* !ACPI_REDUCED_HARDWARE */