1 /****************************************************************************** 2 * 3 * Module Name: evevent - Fixed Event handling and dispatch 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2018, 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