1 /******************************************************************************
3 * Module Name: evevent - Fixed Event handling and dispatch
5 *****************************************************************************/
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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 */
222 acpi_os_fixed_event_count(i);
223 int_status |= acpi_ev_fixed_event_dispatch(i);
230 /*******************************************************************************
232 * FUNCTION: acpi_ev_fixed_event_dispatch
234 * PARAMETERS: Event - Event type
236 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
238 * DESCRIPTION: Clears the status bit for the requested event, calls the
239 * handler that previously registered for the event.
241 ******************************************************************************/
243 static u32 acpi_ev_fixed_event_dispatch(u32 event)
246 ACPI_FUNCTION_ENTRY();
248 /* Clear the status bit */
250 (void)acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
251 status_register_id, ACPI_CLEAR_STATUS);
254 * Make sure we've got a handler. If not, report an error. The event is
255 * disabled to prevent further interrupts.
257 if (NULL == acpi_gbl_fixed_event_handlers[event].handler) {
258 (void)acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
263 "No installed handler for fixed event [0x%08X]",
266 return (ACPI_INTERRUPT_NOT_HANDLED);
269 /* Invoke the Fixed Event handler */
271 return ((acpi_gbl_fixed_event_handlers[event].
272 handler) (acpi_gbl_fixed_event_handlers[event].context));