1 /******************************************************************************
3 * Module Name: evevent - Fixed Event handling and dispatch
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2010, Intel Corp.
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20 * including a substantially similar Disclaimer requirement for further
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23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
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44 #include <acpi/acpi.h>
48 #define _COMPONENT ACPI_EVENTS
49 ACPI_MODULE_NAME("evevent")
51 /* Local prototypes */
52 static acpi_status
acpi_ev_fixed_event_initialize(void);
54 static u32
acpi_ev_fixed_event_dispatch(u32 event
);
56 /*******************************************************************************
58 * FUNCTION: acpi_ev_initialize_events
64 * DESCRIPTION: Initialize global data structures for ACPI events (Fixed, GPE)
66 ******************************************************************************/
68 acpi_status
acpi_ev_initialize_events(void)
72 ACPI_FUNCTION_TRACE(ev_initialize_events
);
75 * Initialize the Fixed and General Purpose Events. This is done prior to
76 * enabling SCIs to prevent interrupts from occurring before the handlers
79 status
= acpi_ev_fixed_event_initialize();
80 if (ACPI_FAILURE(status
)) {
81 ACPI_EXCEPTION((AE_INFO
, status
,
82 "Unable to initialize fixed events"));
83 return_ACPI_STATUS(status
);
86 status
= acpi_ev_gpe_initialize();
87 if (ACPI_FAILURE(status
)) {
88 ACPI_EXCEPTION((AE_INFO
, status
,
89 "Unable to initialize general purpose events"));
90 return_ACPI_STATUS(status
);
93 return_ACPI_STATUS(status
);
96 /*******************************************************************************
98 * FUNCTION: acpi_ev_install_xrupt_handlers
104 * DESCRIPTION: Install interrupt handlers for the SCI and Global Lock
106 ******************************************************************************/
108 acpi_status
acpi_ev_install_xrupt_handlers(void)
112 ACPI_FUNCTION_TRACE(ev_install_xrupt_handlers
);
114 /* Install the SCI handler */
116 status
= acpi_ev_install_sci_handler();
117 if (ACPI_FAILURE(status
)) {
118 ACPI_EXCEPTION((AE_INFO
, status
,
119 "Unable to install System Control Interrupt handler"));
120 return_ACPI_STATUS(status
);
123 /* Install the handler for the Global Lock */
125 status
= acpi_ev_init_global_lock_handler();
126 if (ACPI_FAILURE(status
)) {
127 ACPI_EXCEPTION((AE_INFO
, status
,
128 "Unable to initialize Global Lock handler"));
129 return_ACPI_STATUS(status
);
132 acpi_gbl_events_initialized
= TRUE
;
133 return_ACPI_STATUS(status
);
136 /*******************************************************************************
138 * FUNCTION: acpi_ev_fixed_event_initialize
144 * DESCRIPTION: Install the fixed event handlers and disable all fixed events.
146 ******************************************************************************/
148 static acpi_status
acpi_ev_fixed_event_initialize(void)
154 * Initialize the structure that keeps track of fixed event handlers and
155 * enable the fixed events.
157 for (i
= 0; i
< ACPI_NUM_FIXED_EVENTS
; i
++) {
158 acpi_gbl_fixed_event_handlers
[i
].handler
= NULL
;
159 acpi_gbl_fixed_event_handlers
[i
].context
= NULL
;
161 /* Disable the fixed event */
163 if (acpi_gbl_fixed_event_info
[i
].enable_register_id
!= 0xFF) {
165 acpi_write_bit_register(acpi_gbl_fixed_event_info
166 [i
].enable_register_id
,
168 if (ACPI_FAILURE(status
)) {
177 /*******************************************************************************
179 * FUNCTION: acpi_ev_fixed_event_detect
183 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
185 * DESCRIPTION: Checks the PM status register for active fixed events
187 ******************************************************************************/
189 u32
acpi_ev_fixed_event_detect(void)
191 u32 int_status
= ACPI_INTERRUPT_NOT_HANDLED
;
196 ACPI_FUNCTION_NAME(ev_fixed_event_detect
);
199 * Read the fixed feature status and enable registers, as all the cases
200 * depend on their values. Ignore errors here.
202 (void)acpi_hw_register_read(ACPI_REGISTER_PM1_STATUS
, &fixed_status
);
203 (void)acpi_hw_register_read(ACPI_REGISTER_PM1_ENABLE
, &fixed_enable
);
205 ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS
,
206 "Fixed Event Block: Enable %08X Status %08X\n",
207 fixed_enable
, fixed_status
));
210 * Check for all possible Fixed Events and dispatch those that are active
212 for (i
= 0; i
< ACPI_NUM_FIXED_EVENTS
; i
++) {
214 /* Both the status and enable bits must be on for this event */
216 if ((fixed_status
& acpi_gbl_fixed_event_info
[i
].
218 && (fixed_enable
& acpi_gbl_fixed_event_info
[i
].
221 * Found an active (signalled) event. Invoke global event
222 * handler if present.
224 acpi_fixed_event_count
[i
]++;
225 if (acpi_gbl_global_event_handler
) {
226 acpi_gbl_global_event_handler
227 (ACPI_EVENT_TYPE_FIXED
, NULL
, i
,
228 acpi_gbl_global_event_handler_context
);
231 int_status
|= acpi_ev_fixed_event_dispatch(i
);
238 /*******************************************************************************
240 * FUNCTION: acpi_ev_fixed_event_dispatch
242 * PARAMETERS: Event - Event type
244 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
246 * DESCRIPTION: Clears the status bit for the requested event, calls the
247 * handler that previously registered for the event.
249 ******************************************************************************/
251 static u32
acpi_ev_fixed_event_dispatch(u32 event
)
254 ACPI_FUNCTION_ENTRY();
256 /* Clear the status bit */
258 (void)acpi_write_bit_register(acpi_gbl_fixed_event_info
[event
].
259 status_register_id
, ACPI_CLEAR_STATUS
);
262 * Make sure we've got a handler. If not, report an error. The event is
263 * disabled to prevent further interrupts.
265 if (NULL
== acpi_gbl_fixed_event_handlers
[event
].handler
) {
266 (void)acpi_write_bit_register(acpi_gbl_fixed_event_info
[event
].
271 "No installed handler for fixed event [0x%08X]",
274 return (ACPI_INTERRUPT_NOT_HANDLED
);
277 /* Invoke the Fixed Event handler */
279 return ((acpi_gbl_fixed_event_handlers
[event
].
280 handler
) (acpi_gbl_fixed_event_handlers
[event
].context
));