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ABB semaphore protection overhaul The ABB semaphone protection logic that came with TCS211 from TI was broken in several ways: * Some semaphore-protected functions were called from Application_Initialize() context. NU_Obtain_Semaphore() called with NU_SUSPEND fails with NU_INVALID_SUSPEND in this context, but the return value wasn't checked, and NU_Release_Semaphore() would be called unconditionally at the end. The latter call would increment the semaphore count past 1, making the semaphore no longer binary and thus no longer effective for resource protection. The fix is to check the return value from NU_Obtain_Semaphore() and skip the NU_Release_Semaphore() call if the semaphore wasn't properly obtained. * Some SPI hardware manipulation was being done before entering the semaphore- protected critical section. The fix is to reorder the code: first obtain the semaphore, then do everything else. * In the corner case of L1/DSP recovery, l1_abb_power_on() would call some non-semaphore-protected ABB & SPI init functions. The fix is to skip those calls in the case of recovery. * A few additional corner cases existed, all of which are fixed by making ABB semaphore protection 100% consistent for all ABB functions and code paths. There is still one remaining problem of priority inversion: suppose a low- priority task calls an ABB function, and some medium-priority task just happens to preempt right in the middle of that semaphore-protected ABB operation. Then the high-priority SPI task is locked out for a non-deterministic time until that medium-priority task finishes its work and goes back to sleep. This priority inversion problem remains outstanding for now.
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 26 Apr 2021 20:55:25 +0000
parents fa8dc04885d8
children
line wrap: on
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/* 
+----------------------------------------------------------------------------- 
|  Project :  
|  Modul   :  
+----------------------------------------------------------------------------- 
|  Copyright 2002 Texas Instruments Berlin, AG 
|                 All rights reserved. 
| 
|                 This file is confidential and a trade secret of Texas 
|                 Instruments Berlin, AG 
|                 The receipt of or possession of this file does not convey 
|                 any rights to reproduce or disclose its contents or to 
|                 manufacture, use, or sell anything it may describe, in 
|                 whole, or in part, without the specific written consent of 
|                 Texas Instruments Berlin, AG. 
+----------------------------------------------------------------------------- 
|  Purpose :  Default values of the LLC layer parameters 
|             (conforming to GSM 04.64)
+----------------------------------------------------------------------------- 
*/ 


#ifndef LLC_PAR_H
#define LLC_PAR_H


/*
 * Default values for the LLC layer parameters (conforming to GSM 04.64).
 */

#define LLC_VERSION_ALL_SAPIS           0

#define LLC_IOV_UI_ALL_SAPIS            0

/*
 * The default IOV-I values are calculated with the following formula:
 * 2^27 * SAPI
 */
#define LLC_IOV_I_SAPI_3                402653184L
#define LLC_IOV_I_SAPI_5                671088640L
#define LLC_IOV_I_SAPI_9                1207959552L
#define LLC_IOV_I_SAPI_11               1476395008L

/*
 * Timer values are negotiated in units of 0.1 seconds but are stored
 * in milliseconds.
 * NOTE: T201 uses value of T200.
 */
#define LLC_T200_SAPI_1                 (50 * XID_TIMER_CONVERSION)
#define LLC_T200_SAPI_3                 (50 * XID_TIMER_CONVERSION)
#define LLC_T200_SAPI_5                 (100 * XID_TIMER_CONVERSION)
#define LLC_T200_SAPI_7                 (200 * XID_TIMER_CONVERSION)
#define LLC_T200_SAPI_9                 (200 * XID_TIMER_CONVERSION)
#define LLC_T200_SAPI_11                (400 * XID_TIMER_CONVERSION)

#define LLC_N200_SAPI_1                 3
#define LLC_N200_SAPI_3                 3
#define LLC_N200_SAPI_5                 3
#define LLC_N200_SAPI_7                 3
#define LLC_N200_SAPI_9                 3
#define LLC_N200_SAPI_11                3

#define LLC_N201_U_SAPI_1               400
#define LLC_N201_U_SAPI_3               500
#define LLC_N201_U_SAPI_5               500
#define LLC_N201_U_SAPI_7               270
#define LLC_N201_U_SAPI_9               500
#define LLC_N201_U_SAPI_11              500

#define LLC_N201_I_SAPI_3               1503
#define LLC_N201_I_SAPI_5               1503
#define LLC_N201_I_SAPI_9               1503
#define LLC_N201_I_SAPI_11              1503

#define LLC_MD_SAPI_3                   1520
#define LLC_MD_SAPI_5                   760
#define LLC_MD_SAPI_9                   380
#define LLC_MD_SAPI_11                  190

#define LLC_MU_SAPI_3                   1520
#define LLC_MU_SAPI_5                   760
#define LLC_MU_SAPI_9                   380
#define LLC_MU_SAPI_11                  190

#define LLC_KD_SAPI_3                   16
#define LLC_KD_SAPI_5                   8
#define LLC_KD_SAPI_9                   4
#define LLC_KD_SAPI_11                  2

#define LLC_KU_SAPI_3                   16
#define LLC_KU_SAPI_5                   8
#define LLC_KU_SAPI_9                   4
#define LLC_KU_SAPI_11                  2


#endif /* LLC_PAR_H */