1 /******************************************************************************
2 *
3 * Module Name: evglock - Global Lock support
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2011, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44 #include "acpi.h"
45 #include "accommon.h"
46 #include "acevents.h"
47 #include "acinterp.h"
48
49 #define _COMPONENT ACPI_EVENTS
50 ACPI_MODULE_NAME ("evglock")
51
52
53 /* Local prototypes */
54
55 static UINT32
56 AcpiEvGlobalLockHandler (
57 void *Context);
58
59
60 /*******************************************************************************
61 *
62 * FUNCTION: AcpiEvInitGlobalLockHandler
63 *
64 * PARAMETERS: None
65 *
66 * RETURN: Status
67 *
68 * DESCRIPTION: Install a handler for the global lock release event
69 *
70 ******************************************************************************/
71
72 ACPI_STATUS
73 AcpiEvInitGlobalLockHandler (
74 void)
75 {
76 ACPI_STATUS Status;
77
78
79 ACPI_FUNCTION_TRACE (EvInitGlobalLockHandler);
80
81
82 /* Attempt installation of the global lock handler */
83
84 Status = AcpiInstallFixedEventHandler (ACPI_EVENT_GLOBAL,
85 AcpiEvGlobalLockHandler, NULL);
86
87 /*
88 * If the global lock does not exist on this platform, the attempt to
89 * enable GBL_STATUS will fail (the GBL_ENABLE bit will not stick).
90 * Map to AE_OK, but mark global lock as not present. Any attempt to
91 * actually use the global lock will be flagged with an error.
92 */
93 AcpiGbl_GlobalLockPresent = FALSE;
94 if (Status == AE_NO_HARDWARE_RESPONSE)
95 {
96 ACPI_ERROR ((AE_INFO,
97 "No response from Global Lock hardware, disabling lock"));
98
99 return_ACPI_STATUS (AE_OK);
100 }
101
119 *
120 * RETURN: Status
121 *
122 * DESCRIPTION: Remove the handler for the Global Lock
123 *
124 ******************************************************************************/
125
126 ACPI_STATUS
127 AcpiEvRemoveGlobalLockHandler (
128 void)
129 {
130 ACPI_STATUS Status;
131
132
133 ACPI_FUNCTION_TRACE (EvRemoveGlobalLockHandler);
134
135 AcpiGbl_GlobalLockPresent = FALSE;
136 Status = AcpiRemoveFixedEventHandler (ACPI_EVENT_GLOBAL,
137 AcpiEvGlobalLockHandler);
138
139 return_ACPI_STATUS (Status);
140 }
141
142
143 /*******************************************************************************
144 *
145 * FUNCTION: AcpiEvGlobalLockHandler
146 *
147 * PARAMETERS: Context - From thread interface, not used
148 *
149 * RETURN: ACPI_INTERRUPT_HANDLED
150 *
151 * DESCRIPTION: Invoked directly from the SCI handler when a global lock
152 * release interrupt occurs. If there is actually a pending
153 * request for the lock, signal the waiting thread.
154 *
155 ******************************************************************************/
156
157 static UINT32
158 AcpiEvGlobalLockHandler (
348 /*
349 * If the pending bit was set, we must write GBL_RLS to the control
350 * register
351 */
352 if (Pending)
353 {
354 Status = AcpiWriteBitRegister (
355 ACPI_BITREG_GLOBAL_LOCK_RELEASE, ACPI_ENABLE_EVENT);
356 }
357
358 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Released hardware Global Lock\n"));
359 }
360
361 AcpiGbl_GlobalLockAcquired = FALSE;
362
363 /* Release the local GL mutex */
364
365 AcpiOsReleaseMutex (AcpiGbl_GlobalLockMutex->Mutex.OsMutex);
366 return_ACPI_STATUS (Status);
367 }
|
1 /******************************************************************************
2 *
3 * Module Name: evglock - Global Lock support
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2013, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44 #include "acpi.h"
45 #include "accommon.h"
46 #include "acevents.h"
47 #include "acinterp.h"
48
49 #define _COMPONENT ACPI_EVENTS
50 ACPI_MODULE_NAME ("evglock")
51
52 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */
53
54 /* Local prototypes */
55
56 static UINT32
57 AcpiEvGlobalLockHandler (
58 void *Context);
59
60
61 /*******************************************************************************
62 *
63 * FUNCTION: AcpiEvInitGlobalLockHandler
64 *
65 * PARAMETERS: None
66 *
67 * RETURN: Status
68 *
69 * DESCRIPTION: Install a handler for the global lock release event
70 *
71 ******************************************************************************/
72
73 ACPI_STATUS
74 AcpiEvInitGlobalLockHandler (
75 void)
76 {
77 ACPI_STATUS Status;
78
79
80 ACPI_FUNCTION_TRACE (EvInitGlobalLockHandler);
81
82
83 /* If Hardware Reduced flag is set, there is no global lock */
84
85 if (AcpiGbl_ReducedHardware)
86 {
87 return_ACPI_STATUS (AE_OK);
88 }
89
90 /* Attempt installation of the global lock handler */
91
92 Status = AcpiInstallFixedEventHandler (ACPI_EVENT_GLOBAL,
93 AcpiEvGlobalLockHandler, NULL);
94
95 /*
96 * If the global lock does not exist on this platform, the attempt to
97 * enable GBL_STATUS will fail (the GBL_ENABLE bit will not stick).
98 * Map to AE_OK, but mark global lock as not present. Any attempt to
99 * actually use the global lock will be flagged with an error.
100 */
101 AcpiGbl_GlobalLockPresent = FALSE;
102 if (Status == AE_NO_HARDWARE_RESPONSE)
103 {
104 ACPI_ERROR ((AE_INFO,
105 "No response from Global Lock hardware, disabling lock"));
106
107 return_ACPI_STATUS (AE_OK);
108 }
109
127 *
128 * RETURN: Status
129 *
130 * DESCRIPTION: Remove the handler for the Global Lock
131 *
132 ******************************************************************************/
133
134 ACPI_STATUS
135 AcpiEvRemoveGlobalLockHandler (
136 void)
137 {
138 ACPI_STATUS Status;
139
140
141 ACPI_FUNCTION_TRACE (EvRemoveGlobalLockHandler);
142
143 AcpiGbl_GlobalLockPresent = FALSE;
144 Status = AcpiRemoveFixedEventHandler (ACPI_EVENT_GLOBAL,
145 AcpiEvGlobalLockHandler);
146
147 AcpiOsDeleteLock (AcpiGbl_GlobalLockPendingLock);
148 return_ACPI_STATUS (Status);
149 }
150
151
152 /*******************************************************************************
153 *
154 * FUNCTION: AcpiEvGlobalLockHandler
155 *
156 * PARAMETERS: Context - From thread interface, not used
157 *
158 * RETURN: ACPI_INTERRUPT_HANDLED
159 *
160 * DESCRIPTION: Invoked directly from the SCI handler when a global lock
161 * release interrupt occurs. If there is actually a pending
162 * request for the lock, signal the waiting thread.
163 *
164 ******************************************************************************/
165
166 static UINT32
167 AcpiEvGlobalLockHandler (
357 /*
358 * If the pending bit was set, we must write GBL_RLS to the control
359 * register
360 */
361 if (Pending)
362 {
363 Status = AcpiWriteBitRegister (
364 ACPI_BITREG_GLOBAL_LOCK_RELEASE, ACPI_ENABLE_EVENT);
365 }
366
367 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Released hardware Global Lock\n"));
368 }
369
370 AcpiGbl_GlobalLockAcquired = FALSE;
371
372 /* Release the local GL mutex */
373
374 AcpiOsReleaseMutex (AcpiGbl_GlobalLockMutex->Mutex.OsMutex);
375 return_ACPI_STATUS (Status);
376 }
377
378 #endif /* !ACPI_REDUCED_HARDWARE */
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