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view src/condat/frame/config/gprsdrv.c @ 220:0ed36de51973

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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 4e78acac3d88
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 :  Driver Table for GPRS
+----------------------------------------------------------------------------- 
*/ 

#ifndef __GPRSDRV_C__
#define __GPRSDRV_C__
#endif

#ifndef _TARGET_
#define NEW_ENTITY
#endif

#ifdef _TARGET_
  #ifdef FF_TRACE_OVER_MTST
    #define MTST_TRACE
  #else
    #define TI_TRACE
  #endif
#endif

#include "gdi.h"
#include "vsi.h"
#include "pei.h"
#include "gprsconst.h"
#include "frm_defs.h"
#include "frm_types.h"

/*==== TYPES ======================================================*/


/*==== CONSTANTS ==================================================*/

#if defined _TARGET_ && !defined PCON
 #define TR_RCV_BUF_SIZE    1024
#else
 #define TR_RCV_BUF_SIZE    1024
#endif

#define TR_MAX_IND         (TR_RCV_BUF_SIZE-1)

/*==== EXTERNALS ==================================================*/

#ifdef TI_TRACE
extern USHORT TIF_Init   ( USHORT DrvHandle, T_DRV_CB_FUNC CallbackFunc,
                           T_DRV_EXPORT const **DrvInfo );
extern USHORT TR_Init    ( USHORT DrvHandle, T_DRV_CB_FUNC CallbackFunc,
                           T_DRV_EXPORT const **DrvInfo );
extern USHORT TITRC_Init ( USHORT DrvHandle, T_DRV_CB_FUNC CallbackFunc,
                           T_DRV_EXPORT const **DrvInfo );
#else
extern USHORT TIF_Init     ( USHORT DrvHandle, T_DRV_CB_FUNC CallbackFunc,
                             T_DRV_EXPORT const **DrvInfo );
extern USHORT TR_Init      ( USHORT DrvHandle, T_DRV_CB_FUNC CallbackFunc,
                             T_DRV_EXPORT const **DrvInfo );
extern USHORT SER_Init     ( USHORT DrvHandle, T_DRV_CB_FUNC CallbackFunc,
                             T_DRV_EXPORT const **DrvInfo );
#endif
extern USHORT mux_Init ( USHORT DrvHandle, T_DRV_CB_FUNC CallbackFunc,
                         T_DRV_EXPORT const **DrvInfo );
/*==== VARIABLES ==================================================*/

ULONG TR_RcvBufferSize = TR_RCV_BUF_SIZE;
ULONG TR_MaxInd = TR_MAX_IND;

const T_DRV_LIST_ENTRY DrvList[] =
{
  { NULL,   NULL,         NULL,  NULL },
#ifdef TI_TRACE
  { "TIF",  TIF_Init,     "RCV", NULL },
  { "TR",   TR_Init,      NULL,  NULL },
  { "TITRC",TITRC_Init,   NULL,  "" },
#else 
  #ifdef MTST_TRACE 
  { "TIF",  TIF_Init,     "RCV", NULL },
  { "TR",   TR_Init,      NULL,  NULL },
  { "MUX",  mux_Init,     NULL,  "" },
  #else
  { "TIF",  TIF_Init,     "RCV", NULL },
  { "TR",   TR_Init,      NULL,  NULL },
  { "SER",  SER_Init,     NULL,  ""   },
  #endif
#endif
  { NULL,   NULL,         NULL,  NULL }
};

int vsi_o_trace (char *caller, ULONG tclass, char *text,...)
{
  return 0;
}