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| 6595 | serge | 1 | /****************************************************************************** |
| 2 | * |
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| 3 | * Module Name: evevent - Fixed Event handling and dispatch |
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| 4 | * |
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| 5 | *****************************************************************************/ |
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| 6 | |||
| 7 | /* |
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| 8 | * Copyright (C) 2000 - 2015, Intel Corp. |
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| 9 | * All rights reserved. |
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| 10 | * |
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| 11 | * Redistribution and use in source and binary forms, with or without |
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| 12 | * modification, are permitted provided that the following conditions |
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| 13 | * are met: |
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| 14 | * 1. Redistributions of source code must retain the above copyright |
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| 15 | * notice, this list of conditions, and the following disclaimer, |
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| 16 | * without modification. |
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| 17 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer |
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| 18 | * substantially similar to the "NO WARRANTY" disclaimer below |
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| 19 | * ("Disclaimer") and any redistribution must be conditioned upon |
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| 20 | * including a substantially similar Disclaimer requirement for further |
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| 21 | * binary redistribution. |
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| 22 | * 3. Neither the names of the above-listed copyright holders nor the names |
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| 23 | * of any contributors may be used to endorse or promote products derived |
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| 24 | * from this software without specific prior written permission. |
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| 25 | * |
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| 26 | * Alternatively, this software may be distributed under the terms of the |
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| 27 | * GNU General Public License ("GPL") version 2 as published by the Free |
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| 28 | * Software Foundation. |
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| 29 | * |
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| 30 | * NO WARRANTY |
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| 31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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| 32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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| 33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR |
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| 34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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| 35 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 36 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 37 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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| 39 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
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| 40 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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| 41 | * POSSIBILITY OF SUCH DAMAGES. |
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| 42 | */ |
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| 43 | |||
| 44 | #include |
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| 45 | #include "accommon.h" |
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| 46 | #include "acevents.h" |
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| 47 | |||
| 48 | #define _COMPONENT ACPI_EVENTS |
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| 49 | ACPI_MODULE_NAME("evevent") |
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| 50 | #if (!ACPI_REDUCED_HARDWARE) /* Entire module */ |
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| 51 | /* Local prototypes */ |
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| 52 | static acpi_status acpi_ev_fixed_event_initialize(void); |
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| 53 | |||
| 54 | static u32 acpi_ev_fixed_event_dispatch(u32 event); |
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| 55 | |||
| 56 | /******************************************************************************* |
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| 57 | * |
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| 58 | * FUNCTION: acpi_ev_initialize_events |
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| 59 | * |
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| 60 | * PARAMETERS: None |
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| 61 | * |
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| 62 | * RETURN: Status |
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| 63 | * |
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| 64 | * DESCRIPTION: Initialize global data structures for ACPI events (Fixed, GPE) |
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| 65 | * |
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| 66 | ******************************************************************************/ |
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| 67 | |||
| 68 | acpi_status acpi_ev_initialize_events(void) |
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| 69 | { |
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| 70 | acpi_status status; |
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| 71 | |||
| 72 | ACPI_FUNCTION_TRACE(ev_initialize_events); |
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| 73 | |||
| 74 | /* If Hardware Reduced flag is set, there are no fixed events */ |
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| 75 | |||
| 76 | if (acpi_gbl_reduced_hardware) { |
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| 77 | return_ACPI_STATUS(AE_OK); |
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| 78 | } |
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| 79 | |||
| 80 | /* |
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| 81 | * Initialize the Fixed and General Purpose Events. This is done prior to |
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| 82 | * enabling SCIs to prevent interrupts from occurring before the handlers |
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| 83 | * are installed. |
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| 84 | */ |
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| 85 | status = acpi_ev_fixed_event_initialize(); |
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| 86 | if (ACPI_FAILURE(status)) { |
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| 87 | ACPI_EXCEPTION((AE_INFO, status, |
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| 88 | "Unable to initialize fixed events")); |
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| 89 | return_ACPI_STATUS(status); |
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| 90 | } |
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| 91 | |||
| 92 | status = acpi_ev_gpe_initialize(); |
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| 93 | if (ACPI_FAILURE(status)) { |
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| 94 | ACPI_EXCEPTION((AE_INFO, status, |
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| 95 | "Unable to initialize general purpose events")); |
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| 96 | return_ACPI_STATUS(status); |
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| 97 | } |
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| 98 | |||
| 99 | return_ACPI_STATUS(status); |
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| 100 | } |
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| 101 | |||
| 102 | /******************************************************************************* |
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| 103 | * |
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| 104 | * FUNCTION: acpi_ev_install_xrupt_handlers |
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| 105 | * |
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| 106 | * PARAMETERS: None |
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| 107 | * |
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| 108 | * RETURN: Status |
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| 109 | * |
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| 110 | * DESCRIPTION: Install interrupt handlers for the SCI and Global Lock |
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| 111 | * |
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| 112 | ******************************************************************************/ |
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| 113 | |||
| 114 | acpi_status acpi_ev_install_xrupt_handlers(void) |
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| 115 | { |
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| 116 | acpi_status status; |
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| 117 | |||
| 118 | ACPI_FUNCTION_TRACE(ev_install_xrupt_handlers); |
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| 119 | |||
| 120 | /* If Hardware Reduced flag is set, there is no ACPI h/w */ |
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| 121 | |||
| 122 | if (acpi_gbl_reduced_hardware) { |
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| 123 | return_ACPI_STATUS(AE_OK); |
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| 124 | } |
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| 125 | |||
| 126 | /* Install the SCI handler */ |
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| 127 | |||
| 128 | status = acpi_ev_install_sci_handler(); |
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| 129 | if (ACPI_FAILURE(status)) { |
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| 130 | ACPI_EXCEPTION((AE_INFO, status, |
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| 131 | "Unable to install System Control Interrupt handler")); |
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| 132 | return_ACPI_STATUS(status); |
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| 133 | } |
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| 134 | |||
| 135 | /* Install the handler for the Global Lock */ |
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| 136 | |||
| 137 | status = acpi_ev_init_global_lock_handler(); |
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| 138 | if (ACPI_FAILURE(status)) { |
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| 139 | ACPI_EXCEPTION((AE_INFO, status, |
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| 140 | "Unable to initialize Global Lock handler")); |
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| 141 | return_ACPI_STATUS(status); |
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| 142 | } |
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| 143 | |||
| 144 | acpi_gbl_events_initialized = TRUE; |
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| 145 | return_ACPI_STATUS(status); |
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| 146 | } |
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| 147 | |||
| 148 | /******************************************************************************* |
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| 149 | * |
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| 150 | * FUNCTION: acpi_ev_fixed_event_initialize |
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| 151 | * |
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| 152 | * PARAMETERS: None |
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| 153 | * |
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| 154 | * RETURN: Status |
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| 155 | * |
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| 156 | * DESCRIPTION: Install the fixed event handlers and disable all fixed events. |
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| 157 | * |
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| 158 | ******************************************************************************/ |
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| 159 | |||
| 160 | static acpi_status acpi_ev_fixed_event_initialize(void) |
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| 161 | { |
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| 162 | u32 i; |
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| 163 | acpi_status status; |
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| 164 | |||
| 165 | /* |
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| 166 | * Initialize the structure that keeps track of fixed event handlers and |
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| 167 | * enable the fixed events. |
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| 168 | */ |
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| 169 | for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) { |
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| 170 | acpi_gbl_fixed_event_handlers[i].handler = NULL; |
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| 171 | acpi_gbl_fixed_event_handlers[i].context = NULL; |
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| 172 | |||
| 173 | /* Disable the fixed event */ |
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| 174 | |||
| 175 | if (acpi_gbl_fixed_event_info[i].enable_register_id != 0xFF) { |
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| 176 | status = |
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| 177 | acpi_write_bit_register(acpi_gbl_fixed_event_info |
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| 178 | [i].enable_register_id, |
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| 179 | ACPI_DISABLE_EVENT); |
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| 180 | if (ACPI_FAILURE(status)) { |
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| 181 | return (status); |
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| 182 | } |
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| 183 | } |
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| 184 | } |
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| 185 | |||
| 186 | return (AE_OK); |
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| 187 | } |
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| 188 | |||
| 189 | /******************************************************************************* |
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| 190 | * |
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| 191 | * FUNCTION: acpi_ev_fixed_event_detect |
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| 192 | * |
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| 193 | * PARAMETERS: None |
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| 194 | * |
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| 195 | * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED |
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| 196 | * |
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| 197 | * DESCRIPTION: Checks the PM status register for active fixed events |
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| 198 | * |
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| 199 | ******************************************************************************/ |
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| 200 | |||
| 201 | u32 acpi_ev_fixed_event_detect(void) |
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| 202 | { |
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| 203 | u32 int_status = ACPI_INTERRUPT_NOT_HANDLED; |
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| 204 | u32 fixed_status; |
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| 205 | u32 fixed_enable; |
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| 206 | u32 i; |
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| 207 | |||
| 208 | ACPI_FUNCTION_NAME(ev_fixed_event_detect); |
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| 209 | |||
| 210 | /* |
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| 211 | * Read the fixed feature status and enable registers, as all the cases |
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| 212 | * depend on their values. Ignore errors here. |
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| 213 | */ |
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| 214 | (void)acpi_hw_register_read(ACPI_REGISTER_PM1_STATUS, &fixed_status); |
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| 215 | (void)acpi_hw_register_read(ACPI_REGISTER_PM1_ENABLE, &fixed_enable); |
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| 216 | |||
| 217 | ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS, |
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| 218 | "Fixed Event Block: Enable %08X Status %08X\n", |
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| 219 | fixed_enable, fixed_status)); |
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| 220 | |||
| 221 | /* |
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| 222 | * Check for all possible Fixed Events and dispatch those that are active |
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| 223 | */ |
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| 224 | for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) { |
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| 225 | |||
| 226 | /* Both the status and enable bits must be on for this event */ |
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| 227 | |||
| 228 | if ((fixed_status & acpi_gbl_fixed_event_info[i]. |
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| 229 | status_bit_mask) |
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| 230 | && (fixed_enable & acpi_gbl_fixed_event_info[i]. |
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| 231 | enable_bit_mask)) { |
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| 232 | /* |
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| 233 | * Found an active (signalled) event. Invoke global event |
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| 234 | * handler if present. |
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| 235 | */ |
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| 236 | acpi_fixed_event_count[i]++; |
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| 237 | if (acpi_gbl_global_event_handler) { |
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| 238 | acpi_gbl_global_event_handler |
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| 239 | (ACPI_EVENT_TYPE_FIXED, NULL, i, |
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| 240 | acpi_gbl_global_event_handler_context); |
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| 241 | } |
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| 242 | |||
| 243 | int_status |= acpi_ev_fixed_event_dispatch(i); |
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| 244 | } |
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| 245 | } |
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| 246 | |||
| 247 | return (int_status); |
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| 248 | } |
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| 249 | |||
| 250 | /******************************************************************************* |
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| 251 | * |
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| 252 | * FUNCTION: acpi_ev_fixed_event_dispatch |
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| 253 | * |
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| 254 | * PARAMETERS: event - Event type |
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| 255 | * |
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| 256 | * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED |
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| 257 | * |
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| 258 | * DESCRIPTION: Clears the status bit for the requested event, calls the |
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| 259 | * handler that previously registered for the event. |
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| 260 | * NOTE: If there is no handler for the event, the event is |
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| 261 | * disabled to prevent further interrupts. |
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| 262 | * |
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| 263 | ******************************************************************************/ |
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| 264 | |||
| 265 | static u32 acpi_ev_fixed_event_dispatch(u32 event) |
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| 266 | { |
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| 267 | |||
| 268 | ACPI_FUNCTION_ENTRY(); |
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| 269 | |||
| 270 | /* Clear the status bit */ |
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| 271 | |||
| 272 | (void)acpi_write_bit_register(acpi_gbl_fixed_event_info[event]. |
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| 273 | status_register_id, ACPI_CLEAR_STATUS); |
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| 274 | |||
| 275 | /* |
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| 276 | * Make sure that a handler exists. If not, report an error |
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| 277 | * and disable the event to prevent further interrupts. |
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| 278 | */ |
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| 279 | if (!acpi_gbl_fixed_event_handlers[event].handler) { |
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| 280 | (void)acpi_write_bit_register(acpi_gbl_fixed_event_info[event]. |
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| 281 | enable_register_id, |
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| 282 | ACPI_DISABLE_EVENT); |
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| 283 | |||
| 284 | ACPI_ERROR((AE_INFO, |
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| 285 | "No installed handler for fixed event - %s (%u), disabling", |
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| 286 | acpi_ut_get_event_name(event), event)); |
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| 287 | |||
| 288 | return (ACPI_INTERRUPT_NOT_HANDLED); |
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| 289 | } |
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| 290 | |||
| 291 | /* Invoke the Fixed Event handler */ |
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| 292 | |||
| 293 | return ((acpi_gbl_fixed_event_handlers[event]. |
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| 294 | handler) (acpi_gbl_fixed_event_handlers[event].context)); |
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| 295 | } |
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| 296 | |||
| 297 | #endif /* !ACPI_REDUCED_HARDWARE */ |