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  1. /******************************************************************************
  2.  *
  3.  * Module Name: evevent - Fixed Event handling and dispatch
  4.  *
  5.  *****************************************************************************/
  6.  
  7. /*
  8.  * Copyright (C) 2000 - 2015, Intel Corp.
  9.  * All rights reserved.
  10.  *
  11.  * Redistribution and use in source and binary forms, with or without
  12.  * modification, are permitted provided that the following conditions
  13.  * are met:
  14.  * 1. Redistributions of source code must retain the above copyright
  15.  *    notice, this list of conditions, and the following disclaimer,
  16.  *    without modification.
  17.  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18.  *    substantially similar to the "NO WARRANTY" disclaimer below
  19.  *    ("Disclaimer") and any redistribution must be conditioned upon
  20.  *    including a substantially similar Disclaimer requirement for further
  21.  *    binary redistribution.
  22.  * 3. Neither the names of the above-listed copyright holders nor the names
  23.  *    of any contributors may be used to endorse or promote products derived
  24.  *    from this software without specific prior written permission.
  25.  *
  26.  * Alternatively, this software may be distributed under the terms of the
  27.  * GNU General Public License ("GPL") version 2 as published by the Free
  28.  * Software Foundation.
  29.  *
  30.  * NO WARRANTY
  31.  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32.  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33.  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34.  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35.  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36.  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37.  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38.  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39.  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40.  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41.  * POSSIBILITY OF SUCH DAMAGES.
  42.  */
  43.  
  44. #include <acpi/acpi.h>
  45. #include "accommon.h"
  46. #include "acevents.h"
  47.  
  48. #define _COMPONENT          ACPI_EVENTS
  49. ACPI_MODULE_NAME("evevent")
  50. #if (!ACPI_REDUCED_HARDWARE)    /* Entire module */
  51. /* Local prototypes */
  52. static acpi_status acpi_ev_fixed_event_initialize(void);
  53.  
  54. static u32 acpi_ev_fixed_event_dispatch(u32 event);
  55.  
  56. /*******************************************************************************
  57.  *
  58.  * FUNCTION:    acpi_ev_initialize_events
  59.  *
  60.  * PARAMETERS:  None
  61.  *
  62.  * RETURN:      Status
  63.  *
  64.  * DESCRIPTION: Initialize global data structures for ACPI events (Fixed, GPE)
  65.  *
  66.  ******************************************************************************/
  67.  
  68. acpi_status acpi_ev_initialize_events(void)
  69. {
  70.         acpi_status status;
  71.  
  72.         ACPI_FUNCTION_TRACE(ev_initialize_events);
  73.  
  74.         /* If Hardware Reduced flag is set, there are no fixed events */
  75.  
  76.         if (acpi_gbl_reduced_hardware) {
  77.                 return_ACPI_STATUS(AE_OK);
  78.         }
  79.  
  80.         /*
  81.          * Initialize the Fixed and General Purpose Events. This is done prior to
  82.          * enabling SCIs to prevent interrupts from occurring before the handlers
  83.          * are installed.
  84.          */
  85.         status = acpi_ev_fixed_event_initialize();
  86.         if (ACPI_FAILURE(status)) {
  87.                 ACPI_EXCEPTION((AE_INFO, status,
  88.                                 "Unable to initialize fixed events"));
  89.                 return_ACPI_STATUS(status);
  90.         }
  91.  
  92.         status = acpi_ev_gpe_initialize();
  93.         if (ACPI_FAILURE(status)) {
  94.                 ACPI_EXCEPTION((AE_INFO, status,
  95.                                 "Unable to initialize general purpose events"));
  96.                 return_ACPI_STATUS(status);
  97.         }
  98.  
  99.         return_ACPI_STATUS(status);
  100. }
  101.  
  102. /*******************************************************************************
  103.  *
  104.  * FUNCTION:    acpi_ev_install_xrupt_handlers
  105.  *
  106.  * PARAMETERS:  None
  107.  *
  108.  * RETURN:      Status
  109.  *
  110.  * DESCRIPTION: Install interrupt handlers for the SCI and Global Lock
  111.  *
  112.  ******************************************************************************/
  113.  
  114. acpi_status acpi_ev_install_xrupt_handlers(void)
  115. {
  116.         acpi_status status;
  117.  
  118.         ACPI_FUNCTION_TRACE(ev_install_xrupt_handlers);
  119.  
  120.         /* If Hardware Reduced flag is set, there is no ACPI h/w */
  121.  
  122.         if (acpi_gbl_reduced_hardware) {
  123.                 return_ACPI_STATUS(AE_OK);
  124.         }
  125.  
  126.         /* Install the SCI handler */
  127.  
  128.         status = acpi_ev_install_sci_handler();
  129.         if (ACPI_FAILURE(status)) {
  130.                 ACPI_EXCEPTION((AE_INFO, status,
  131.                                 "Unable to install System Control Interrupt handler"));
  132.                 return_ACPI_STATUS(status);
  133.         }
  134.  
  135.         /* Install the handler for the Global Lock */
  136.  
  137.         status = acpi_ev_init_global_lock_handler();
  138.         if (ACPI_FAILURE(status)) {
  139.                 ACPI_EXCEPTION((AE_INFO, status,
  140.                                 "Unable to initialize Global Lock handler"));
  141.                 return_ACPI_STATUS(status);
  142.         }
  143.  
  144.         acpi_gbl_events_initialized = TRUE;
  145.         return_ACPI_STATUS(status);
  146. }
  147.  
  148. /*******************************************************************************
  149.  *
  150.  * FUNCTION:    acpi_ev_fixed_event_initialize
  151.  *
  152.  * PARAMETERS:  None
  153.  *
  154.  * RETURN:      Status
  155.  *
  156.  * DESCRIPTION: Install the fixed event handlers and disable all fixed events.
  157.  *
  158.  ******************************************************************************/
  159.  
  160. static acpi_status acpi_ev_fixed_event_initialize(void)
  161. {
  162.         u32 i;
  163.         acpi_status status;
  164.  
  165.         /*
  166.          * Initialize the structure that keeps track of fixed event handlers and
  167.          * enable the fixed events.
  168.          */
  169.         for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
  170.                 acpi_gbl_fixed_event_handlers[i].handler = NULL;
  171.                 acpi_gbl_fixed_event_handlers[i].context = NULL;
  172.  
  173.                 /* Disable the fixed event */
  174.  
  175.                 if (acpi_gbl_fixed_event_info[i].enable_register_id != 0xFF) {
  176.                         status =
  177.                             acpi_write_bit_register(acpi_gbl_fixed_event_info
  178.                                                     [i].enable_register_id,
  179.                                                     ACPI_DISABLE_EVENT);
  180.                         if (ACPI_FAILURE(status)) {
  181.                                 return (status);
  182.                         }
  183.                 }
  184.         }
  185.  
  186.         return (AE_OK);
  187. }
  188.  
  189. /*******************************************************************************
  190.  *
  191.  * FUNCTION:    acpi_ev_fixed_event_detect
  192.  *
  193.  * PARAMETERS:  None
  194.  *
  195.  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
  196.  *
  197.  * DESCRIPTION: Checks the PM status register for active fixed events
  198.  *
  199.  ******************************************************************************/
  200.  
  201. u32 acpi_ev_fixed_event_detect(void)
  202. {
  203.         u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
  204.         u32 fixed_status;
  205.         u32 fixed_enable;
  206.         u32 i;
  207.  
  208.         ACPI_FUNCTION_NAME(ev_fixed_event_detect);
  209.  
  210.         /*
  211.          * Read the fixed feature status and enable registers, as all the cases
  212.          * depend on their values. Ignore errors here.
  213.          */
  214.         (void)acpi_hw_register_read(ACPI_REGISTER_PM1_STATUS, &fixed_status);
  215.         (void)acpi_hw_register_read(ACPI_REGISTER_PM1_ENABLE, &fixed_enable);
  216.  
  217.         ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
  218.                           "Fixed Event Block: Enable %08X Status %08X\n",
  219.                           fixed_enable, fixed_status));
  220.  
  221.         /*
  222.          * Check for all possible Fixed Events and dispatch those that are active
  223.          */
  224.         for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
  225.  
  226.                 /* Both the status and enable bits must be on for this event */
  227.  
  228.                 if ((fixed_status & acpi_gbl_fixed_event_info[i].
  229.                      status_bit_mask)
  230.                     && (fixed_enable & acpi_gbl_fixed_event_info[i].
  231.                         enable_bit_mask)) {
  232.                         /*
  233.                          * Found an active (signalled) event. Invoke global event
  234.                          * handler if present.
  235.                          */
  236.                         acpi_fixed_event_count[i]++;
  237.                         if (acpi_gbl_global_event_handler) {
  238.                                 acpi_gbl_global_event_handler
  239.                                     (ACPI_EVENT_TYPE_FIXED, NULL, i,
  240.                                      acpi_gbl_global_event_handler_context);
  241.                         }
  242.  
  243.                         int_status |= acpi_ev_fixed_event_dispatch(i);
  244.                 }
  245.         }
  246.  
  247.         return (int_status);
  248. }
  249.  
  250. /*******************************************************************************
  251.  *
  252.  * FUNCTION:    acpi_ev_fixed_event_dispatch
  253.  *
  254.  * PARAMETERS:  event               - Event type
  255.  *
  256.  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
  257.  *
  258.  * DESCRIPTION: Clears the status bit for the requested event, calls the
  259.  *              handler that previously registered for the event.
  260.  *              NOTE: If there is no handler for the event, the event is
  261.  *              disabled to prevent further interrupts.
  262.  *
  263.  ******************************************************************************/
  264.  
  265. static u32 acpi_ev_fixed_event_dispatch(u32 event)
  266. {
  267.  
  268.         ACPI_FUNCTION_ENTRY();
  269.  
  270.         /* Clear the status bit */
  271.  
  272.         (void)acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
  273.                                       status_register_id, ACPI_CLEAR_STATUS);
  274.  
  275.         /*
  276.          * Make sure that a handler exists. If not, report an error
  277.          * and disable the event to prevent further interrupts.
  278.          */
  279.         if (!acpi_gbl_fixed_event_handlers[event].handler) {
  280.                 (void)acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
  281.                                               enable_register_id,
  282.                                               ACPI_DISABLE_EVENT);
  283.  
  284.                 ACPI_ERROR((AE_INFO,
  285.                             "No installed handler for fixed event - %s (%u), disabling",
  286.                             acpi_ut_get_event_name(event), event));
  287.  
  288.                 return (ACPI_INTERRUPT_NOT_HANDLED);
  289.         }
  290.  
  291.         /* Invoke the Fixed Event handler */
  292.  
  293.         return ((acpi_gbl_fixed_event_handlers[event].
  294.                  handler) (acpi_gbl_fixed_event_handlers[event].context));
  295. }
  296.  
  297. #endif                          /* !ACPI_REDUCED_HARDWARE */
  298.