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 - 2015, 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 ACPICA 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 acpi_sci_count++; 141 return_UINT32(interrupt_handled); 142 } 143 144 /******************************************************************************* 145 * 146 * FUNCTION: acpi_ev_gpe_xrupt_handler 147 * 148 * PARAMETERS: context - Calling Context 149 * 150 * RETURN: Status code indicates whether interrupt was handled. 151 * 152 * DESCRIPTION: Handler for GPE Block Device interrupts 153 * 154 ******************************************************************************/ 155 156 u32 ACPI_SYSTEM_XFACE acpi_ev_gpe_xrupt_handler(void *context) 157 { 158 struct acpi_gpe_xrupt_info *gpe_xrupt_list = context; 159 u32 interrupt_handled = ACPI_INTERRUPT_NOT_HANDLED; 160 161 ACPI_FUNCTION_TRACE(ev_gpe_xrupt_handler); 162 163 /* 164 * We are guaranteed by the ACPICA initialization/shutdown code that 165 * if this interrupt handler is installed, ACPI is enabled. 166 */ 167 168 /* GPEs: Check for and dispatch any GPEs that have occurred */ 169 170 interrupt_handled |= acpi_ev_gpe_detect(gpe_xrupt_list); 171 return_UINT32(interrupt_handled); 172 } 173 174 /****************************************************************************** 175 * 176 * FUNCTION: acpi_ev_install_sci_handler 177 * 178 * PARAMETERS: none 179 * 180 * RETURN: Status 181 * 182 * DESCRIPTION: Installs SCI handler. 183 * 184 ******************************************************************************/ 185 186 u32 acpi_ev_install_sci_handler(void) 187 { 188 u32 status = AE_OK; 189 190 ACPI_FUNCTION_TRACE(ev_install_sci_handler); 191 192 status = 193 acpi_os_install_interrupt_handler((u32) acpi_gbl_FADT.sci_interrupt, 194 acpi_ev_sci_xrupt_handler, 195 acpi_gbl_gpe_xrupt_list_head); 196 return_ACPI_STATUS(status); 197 } 198 199 /****************************************************************************** 200 * 201 * FUNCTION: acpi_ev_remove_all_sci_handlers 202 * 203 * PARAMETERS: none 204 * 205 * RETURN: AE_OK if handler uninstalled, AE_ERROR if handler was not 206 * installed to begin with 207 * 208 * DESCRIPTION: Remove the SCI interrupt handler. No further SCIs will be 209 * taken. Remove all host-installed SCI handlers. 210 * 211 * Note: It doesn't seem important to disable all events or set the event 212 * enable registers to their original values. The OS should disable 213 * the SCI interrupt level when the handler is removed, so no more 214 * events will come in. 215 * 216 ******************************************************************************/ 217 218 acpi_status acpi_ev_remove_all_sci_handlers(void) 219 { 220 struct acpi_sci_handler_info *sci_handler; 221 acpi_cpu_flags flags; 222 acpi_status status; 223 224 ACPI_FUNCTION_TRACE(ev_remove_all_sci_handlers); 225 226 /* Just let the OS remove the handler and disable the level */ 227 228 status = 229 acpi_os_remove_interrupt_handler((u32) acpi_gbl_FADT.sci_interrupt, 230 acpi_ev_sci_xrupt_handler); 231 232 if (!acpi_gbl_sci_handler_list) { 233 return (status); 234 } 235 236 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); 237 238 /* Free all host-installed SCI handlers */ 239 240 while (acpi_gbl_sci_handler_list) { 241 sci_handler = acpi_gbl_sci_handler_list; 242 acpi_gbl_sci_handler_list = sci_handler->next; 243 ACPI_FREE(sci_handler); 244 } 245 246 acpi_os_release_lock(acpi_gbl_gpe_lock, flags); 247 return_ACPI_STATUS(status); 248 } 249 250 #endif /* !ACPI_REDUCED_HARDWARE */ 251