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1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.02/******************************************************************************3 *4 * Module Name: evevent - Fixed Event handling and dispatch5 *6 * Copyright (C) 2000 - 2023, Intel Corp.7 *8 *****************************************************************************/9 10#include <acpi/acpi.h>11#include "accommon.h"12#include "acevents.h"13 14#define _COMPONENT ACPI_EVENTS15ACPI_MODULE_NAME("evevent")16#if (!ACPI_REDUCED_HARDWARE) /* Entire module */17/* Local prototypes */18static acpi_status acpi_ev_fixed_event_initialize(void);19 20static u32 acpi_ev_fixed_event_dispatch(u32 event);21 22/*******************************************************************************23 *24 * FUNCTION: acpi_ev_initialize_events25 *26 * PARAMETERS: None27 *28 * RETURN: Status29 *30 * DESCRIPTION: Initialize global data structures for ACPI events (Fixed, GPE)31 *32 ******************************************************************************/33 34acpi_status acpi_ev_initialize_events(void)35{36 acpi_status status;37 38 ACPI_FUNCTION_TRACE(ev_initialize_events);39 40 /* If Hardware Reduced flag is set, there are no fixed events */41 42 if (acpi_gbl_reduced_hardware) {43 return_ACPI_STATUS(AE_OK);44 }45 46 /*47 * Initialize the Fixed and General Purpose Events. This is done prior to48 * enabling SCIs to prevent interrupts from occurring before the handlers49 * are installed.50 */51 status = acpi_ev_fixed_event_initialize();52 if (ACPI_FAILURE(status)) {53 ACPI_EXCEPTION((AE_INFO, status,54 "Unable to initialize fixed events"));55 return_ACPI_STATUS(status);56 }57 58 status = acpi_ev_gpe_initialize();59 if (ACPI_FAILURE(status)) {60 ACPI_EXCEPTION((AE_INFO, status,61 "Unable to initialize general purpose events"));62 return_ACPI_STATUS(status);63 }64 65 return_ACPI_STATUS(status);66}67 68/*******************************************************************************69 *70 * FUNCTION: acpi_ev_install_xrupt_handlers71 *72 * PARAMETERS: None73 *74 * RETURN: Status75 *76 * DESCRIPTION: Install interrupt handlers for the SCI and Global Lock77 *78 ******************************************************************************/79 80acpi_status acpi_ev_install_xrupt_handlers(void)81{82 acpi_status status;83 84 ACPI_FUNCTION_TRACE(ev_install_xrupt_handlers);85 86 /* If Hardware Reduced flag is set, there is no ACPI h/w */87 88 if (acpi_gbl_reduced_hardware) {89 return_ACPI_STATUS(AE_OK);90 }91 92 /* Install the SCI handler */93 94 status = acpi_ev_install_sci_handler();95 if (ACPI_FAILURE(status)) {96 ACPI_EXCEPTION((AE_INFO, status,97 "Unable to install System Control Interrupt handler"));98 return_ACPI_STATUS(status);99 }100 101 /* Install the handler for the Global Lock */102 103 status = acpi_ev_init_global_lock_handler();104 if (ACPI_FAILURE(status)) {105 ACPI_EXCEPTION((AE_INFO, status,106 "Unable to initialize Global Lock handler"));107 return_ACPI_STATUS(status);108 }109 110 acpi_gbl_events_initialized = TRUE;111 return_ACPI_STATUS(status);112}113 114/*******************************************************************************115 *116 * FUNCTION: acpi_ev_fixed_event_initialize117 *118 * PARAMETERS: None119 *120 * RETURN: Status121 *122 * DESCRIPTION: Install the fixed event handlers and disable all fixed events.123 *124 ******************************************************************************/125 126static acpi_status acpi_ev_fixed_event_initialize(void)127{128 u32 i;129 acpi_status status;130 131 /*132 * Initialize the structure that keeps track of fixed event handlers and133 * disable all of the fixed events.134 */135 for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {136 acpi_gbl_fixed_event_handlers[i].handler = NULL;137 acpi_gbl_fixed_event_handlers[i].context = NULL;138 139 /* Disable the fixed event */140 141 if (acpi_gbl_fixed_event_info[i].enable_register_id != 0xFF) {142 status =143 acpi_write_bit_register(acpi_gbl_fixed_event_info144 [i].enable_register_id,145 ACPI_DISABLE_EVENT);146 if (ACPI_FAILURE(status)) {147 return (status);148 }149 }150 }151 152 return (AE_OK);153}154 155/*******************************************************************************156 *157 * FUNCTION: acpi_ev_fixed_event_detect158 *159 * PARAMETERS: None160 *161 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED162 *163 * DESCRIPTION: Checks the PM status register for active fixed events164 *165 ******************************************************************************/166 167u32 acpi_ev_fixed_event_detect(void)168{169 u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;170 u32 fixed_status;171 u32 fixed_enable;172 u32 i;173 acpi_status status;174 175 ACPI_FUNCTION_NAME(ev_fixed_event_detect);176 177 /*178 * Read the fixed feature status and enable registers, as all the cases179 * depend on their values. Ignore errors here.180 */181 status = acpi_hw_register_read(ACPI_REGISTER_PM1_STATUS, &fixed_status);182 status |=183 acpi_hw_register_read(ACPI_REGISTER_PM1_ENABLE, &fixed_enable);184 if (ACPI_FAILURE(status)) {185 return (int_status);186 }187 188 ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,189 "Fixed Event Block: Enable %08X Status %08X\n",190 fixed_enable, fixed_status));191 192 /*193 * Check for all possible Fixed Events and dispatch those that are active194 */195 for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {196 197 /* Both the status and enable bits must be on for this event */198 199 if ((fixed_status & acpi_gbl_fixed_event_info[i].200 status_bit_mask)201 && (fixed_enable & acpi_gbl_fixed_event_info[i].202 enable_bit_mask)) {203 /*204 * Found an active (signalled) event. Invoke global event205 * handler if present.206 */207 acpi_fixed_event_count[i]++;208 if (acpi_gbl_global_event_handler) {209 acpi_gbl_global_event_handler210 (ACPI_EVENT_TYPE_FIXED, NULL, i,211 acpi_gbl_global_event_handler_context);212 }213 214 int_status |= acpi_ev_fixed_event_dispatch(i);215 }216 }217 218 return (int_status);219}220 221/*******************************************************************************222 *223 * FUNCTION: acpi_ev_fixed_event_dispatch224 *225 * PARAMETERS: event - Event type226 *227 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED228 *229 * DESCRIPTION: Clears the status bit for the requested event, calls the230 * handler that previously registered for the event.231 * NOTE: If there is no handler for the event, the event is232 * disabled to prevent further interrupts.233 *234 ******************************************************************************/235 236static u32 acpi_ev_fixed_event_dispatch(u32 event)237{238 239 ACPI_FUNCTION_ENTRY();240 241 /* Clear the status bit */242 243 (void)acpi_write_bit_register(acpi_gbl_fixed_event_info[event].244 status_register_id, ACPI_CLEAR_STATUS);245 246 /*247 * Make sure that a handler exists. If not, report an error248 * and disable the event to prevent further interrupts.249 */250 if (!acpi_gbl_fixed_event_handlers[event].handler) {251 (void)acpi_write_bit_register(acpi_gbl_fixed_event_info[event].252 enable_register_id,253 ACPI_DISABLE_EVENT);254 255 ACPI_ERROR((AE_INFO,256 "No installed handler for fixed event - %s (%u), disabling",257 acpi_ut_get_event_name(event), event));258 259 return (ACPI_INTERRUPT_NOT_HANDLED);260 }261 262 /* Invoke the Fixed Event handler */263 264 return ((acpi_gbl_fixed_event_handlers[event].265 handler) (acpi_gbl_fixed_event_handlers[event].context));266}267 268/*******************************************************************************269 *270 * FUNCTION: acpi_any_fixed_event_status_set271 *272 * PARAMETERS: None273 *274 * RETURN: TRUE or FALSE275 *276 * DESCRIPTION: Checks the PM status register for active fixed events277 *278 ******************************************************************************/279 280u32 acpi_any_fixed_event_status_set(void)281{282 acpi_status status;283 u32 in_status;284 u32 in_enable;285 u32 i;286 287 status = acpi_hw_register_read(ACPI_REGISTER_PM1_ENABLE, &in_enable);288 if (ACPI_FAILURE(status)) {289 return (FALSE);290 }291 292 status = acpi_hw_register_read(ACPI_REGISTER_PM1_STATUS, &in_status);293 if (ACPI_FAILURE(status)) {294 return (FALSE);295 }296 297 /*298 * Check for all possible Fixed Events and dispatch those that are active299 */300 for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {301 302 /* Both the status and enable bits must be on for this event */303 304 if ((in_status & acpi_gbl_fixed_event_info[i].status_bit_mask) &&305 (in_enable & acpi_gbl_fixed_event_info[i].enable_bit_mask)) {306 return (TRUE);307 }308 }309 310 return (FALSE);311}312 313#endif /* !ACPI_REDUCED_HARDWARE */314