1 /*******************************************************************************
3 * Module Name: evsci - System Control Interrupt configuration and
4 * legacy to ACPI mode state transition functions
6 ******************************************************************************/
9 * Copyright (C) 2000 - 2013, Intel Corp.
10 * All rights reserved.
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13 * modification, are permitted provided that the following conditions
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21 * including a substantially similar Disclaimer requirement for further
22 * binary redistribution.
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24 * of any contributors may be used to endorse or promote products derived
25 * from this software without specific prior written permission.
27 * Alternatively, this software may be distributed under the terms of the
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45 #include <acpi/acpi.h>
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);
55 /*******************************************************************************
57 * FUNCTION: acpi_ev_sci_dispatch
61 * RETURN: Status code indicates whether interrupt was handled.
63 * DESCRIPTION: Dispatch the SCI to all host-installed SCI handlers.
65 ******************************************************************************/
67 u32 acpi_ev_sci_dispatch(void)
69 struct acpi_sci_handler_info *sci_handler;
71 u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
73 ACPI_FUNCTION_NAME(ev_sci_dispatch);
75 /* Are there any host-installed SCI handlers? */
77 if (!acpi_gbl_sci_handler_list) {
81 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
83 /* Invoke all host-installed SCI handlers */
85 sci_handler = acpi_gbl_sci_handler_list;
88 /* Invoke the installed handler (at interrupt level) */
90 int_status |= sci_handler->address((u32)acpi_gbl_FADT.
92 sci_handler->context);
94 sci_handler = sci_handler->next;
97 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
101 /*******************************************************************************
103 * FUNCTION: acpi_ev_sci_xrupt_handler
105 * PARAMETERS: context - Calling Context
107 * RETURN: Status code indicates whether interrupt was handled.
109 * DESCRIPTION: Interrupt handler that will figure out what function or
110 * control method to call to deal with a SCI.
112 ******************************************************************************/
114 static u32 ACPI_SYSTEM_XFACE acpi_ev_sci_xrupt_handler(void *context)
116 struct acpi_gpe_xrupt_info *gpe_xrupt_list = context;
117 u32 interrupt_handled = ACPI_INTERRUPT_NOT_HANDLED;
119 ACPI_FUNCTION_TRACE(ev_sci_xrupt_handler);
122 * We are guaranteed by the ACPI CA initialization/shutdown code that
123 * if this interrupt handler is installed, ACPI is enabled.
128 * Check for and dispatch any Fixed Events that have occurred
130 interrupt_handled |= acpi_ev_fixed_event_detect();
133 * General Purpose Events:
134 * Check for and dispatch any GPEs that have occurred
136 interrupt_handled |= acpi_ev_gpe_detect(gpe_xrupt_list);
138 /* Invoke all host-installed SCI handlers */
140 interrupt_handled |= acpi_ev_sci_dispatch();
142 return_UINT32(interrupt_handled);
145 /*******************************************************************************
147 * FUNCTION: acpi_ev_gpe_xrupt_handler
149 * PARAMETERS: context - Calling Context
151 * RETURN: Status code indicates whether interrupt was handled.
153 * DESCRIPTION: Handler for GPE Block Device interrupts
155 ******************************************************************************/
157 u32 ACPI_SYSTEM_XFACE acpi_ev_gpe_xrupt_handler(void *context)
159 struct acpi_gpe_xrupt_info *gpe_xrupt_list = context;
160 u32 interrupt_handled = ACPI_INTERRUPT_NOT_HANDLED;
162 ACPI_FUNCTION_TRACE(ev_gpe_xrupt_handler);
165 * We are guaranteed by the ACPICA initialization/shutdown code that
166 * if this interrupt handler is installed, ACPI is enabled.
169 /* GPEs: Check for and dispatch any GPEs that have occurred */
171 interrupt_handled |= acpi_ev_gpe_detect(gpe_xrupt_list);
172 return_UINT32(interrupt_handled);
175 /******************************************************************************
177 * FUNCTION: acpi_ev_install_sci_handler
183 * DESCRIPTION: Installs SCI handler.
185 ******************************************************************************/
187 u32 acpi_ev_install_sci_handler(void)
191 ACPI_FUNCTION_TRACE(ev_install_sci_handler);
194 acpi_os_install_interrupt_handler((u32) acpi_gbl_FADT.sci_interrupt,
195 acpi_ev_sci_xrupt_handler,
196 acpi_gbl_gpe_xrupt_list_head);
197 return_ACPI_STATUS(status);
200 /******************************************************************************
202 * FUNCTION: acpi_ev_remove_all_sci_handlers
206 * RETURN: AE_OK if handler uninstalled, AE_ERROR if handler was not
207 * installed to begin with
209 * DESCRIPTION: Remove the SCI interrupt handler. No further SCIs will be
210 * taken. Remove all host-installed SCI handlers.
212 * Note: It doesn't seem important to disable all events or set the event
213 * enable registers to their original values. The OS should disable
214 * the SCI interrupt level when the handler is removed, so no more
215 * events will come in.
217 ******************************************************************************/
219 acpi_status acpi_ev_remove_all_sci_handlers(void)
221 struct acpi_sci_handler_info *sci_handler;
222 acpi_cpu_flags flags;
225 ACPI_FUNCTION_TRACE(ev_remove_all_sci_handlers);
227 /* Just let the OS remove the handler and disable the level */
230 acpi_os_remove_interrupt_handler((u32) acpi_gbl_FADT.sci_interrupt,
231 acpi_ev_sci_xrupt_handler);
233 if (!acpi_gbl_sci_handler_list) {
237 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
239 /* Free all host-installed SCI handlers */
241 while (acpi_gbl_sci_handler_list) {
242 sci_handler = acpi_gbl_sci_handler_list;
243 acpi_gbl_sci_handler_list = sci_handler->next;
244 ACPI_FREE(sci_handler);
247 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
248 return_ACPI_STATUS(status);
251 #endif /* !ACPI_REDUCED_HARDWARE */