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(sci_handler->context);
92 sci_handler = sci_handler->next;
95 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
99 /*******************************************************************************
101 * FUNCTION: acpi_ev_sci_xrupt_handler
103 * PARAMETERS: context - Calling Context
105 * RETURN: Status code indicates whether interrupt was handled.
107 * DESCRIPTION: Interrupt handler that will figure out what function or
108 * control method to call to deal with a SCI.
110 ******************************************************************************/
112 static u32 ACPI_SYSTEM_XFACE acpi_ev_sci_xrupt_handler(void *context)
114 struct acpi_gpe_xrupt_info *gpe_xrupt_list = context;
115 u32 interrupt_handled = ACPI_INTERRUPT_NOT_HANDLED;
117 ACPI_FUNCTION_TRACE(ev_sci_xrupt_handler);
120 * We are guaranteed by the ACPI CA initialization/shutdown code that
121 * if this interrupt handler is installed, ACPI is enabled.
126 * Check for and dispatch any Fixed Events that have occurred
128 interrupt_handled |= acpi_ev_fixed_event_detect();
131 * General Purpose Events:
132 * Check for and dispatch any GPEs that have occurred
134 interrupt_handled |= acpi_ev_gpe_detect(gpe_xrupt_list);
136 /* Invoke all host-installed SCI handlers */
138 interrupt_handled |= acpi_ev_sci_dispatch();
140 return_UINT32(interrupt_handled);
143 /*******************************************************************************
145 * FUNCTION: acpi_ev_gpe_xrupt_handler
147 * PARAMETERS: context - Calling Context
149 * RETURN: Status code indicates whether interrupt was handled.
151 * DESCRIPTION: Handler for GPE Block Device interrupts
153 ******************************************************************************/
155 u32 ACPI_SYSTEM_XFACE acpi_ev_gpe_xrupt_handler(void *context)
157 struct acpi_gpe_xrupt_info *gpe_xrupt_list = context;
158 u32 interrupt_handled = ACPI_INTERRUPT_NOT_HANDLED;
160 ACPI_FUNCTION_TRACE(ev_gpe_xrupt_handler);
163 * We are guaranteed by the ACPICA initialization/shutdown code that
164 * if this interrupt handler is installed, ACPI is enabled.
167 /* GPEs: Check for and dispatch any GPEs that have occurred */
169 interrupt_handled |= acpi_ev_gpe_detect(gpe_xrupt_list);
170 return_UINT32(interrupt_handled);
173 /******************************************************************************
175 * FUNCTION: acpi_ev_install_sci_handler
181 * DESCRIPTION: Installs SCI handler.
183 ******************************************************************************/
185 u32 acpi_ev_install_sci_handler(void)
189 ACPI_FUNCTION_TRACE(ev_install_sci_handler);
192 acpi_os_install_interrupt_handler((u32) acpi_gbl_FADT.sci_interrupt,
193 acpi_ev_sci_xrupt_handler,
194 acpi_gbl_gpe_xrupt_list_head);
195 return_ACPI_STATUS(status);
198 /******************************************************************************
200 * FUNCTION: acpi_ev_remove_all_sci_handlers
204 * RETURN: AE_OK if handler uninstalled, AE_ERROR if handler was not
205 * installed to begin with
207 * DESCRIPTION: Remove the SCI interrupt handler. No further SCIs will be
208 * taken. Remove all host-installed SCI handlers.
210 * Note: It doesn't seem important to disable all events or set the event
211 * enable registers to their original values. The OS should disable
212 * the SCI interrupt level when the handler is removed, so no more
213 * events will come in.
215 ******************************************************************************/
217 acpi_status acpi_ev_remove_all_sci_handlers(void)
219 struct acpi_sci_handler_info *sci_handler;
220 acpi_cpu_flags flags;
223 ACPI_FUNCTION_TRACE(ev_remove_all_sci_handlers);
225 /* Just let the OS remove the handler and disable the level */
228 acpi_os_remove_interrupt_handler((u32) acpi_gbl_FADT.sci_interrupt,
229 acpi_ev_sci_xrupt_handler);
231 if (!acpi_gbl_sci_handler_list) {
235 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
237 /* Free all host-installed SCI handlers */
239 while (acpi_gbl_sci_handler_list) {
240 sci_handler = acpi_gbl_sci_handler_list;
241 acpi_gbl_sci_handler_list = sci_handler->next;
242 ACPI_FREE(sci_handler);
245 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
246 return_ACPI_STATUS(status);
249 #endif /* !ACPI_REDUCED_HARDWARE */