kernel-tenderloin-3.0/drivers/misc/a6/low_level_funcs.c

#include "a6_host_adapter.h"
#include "low_level_funcs.h"

// declarations for active implementation mappings used by the sbw code...
extern uint16_t (*SetSBWTCK)(void);
extern uint16_t (*ClrSBWTCK)(void);
extern uint16_t (*SetSBWTDIO)(void);
extern uint16_t (*ClrSBWTDIO)(void);
extern uint16_t (*SetInSBWTDIO)(void);
extern uint16_t (*SetOutSBWTDIO)(void);
extern uint16_t (*GetSBWTDIO)(void);
extern uint16_t (*SetSBWAKEUP)(void);
extern uint16_t (*ClrSBWAKEUP)(void);
extern void (*delay)(uint32_t delay_us);
//

byte tdo_bit;               //holds the value of TDO-bit
byte TCLK_saved = 1;  // holds the last value of TCLK before entering a JTAG sequence

/****************************************************************************/
/* Function declarations which have to be programmed by the user for use    */
/* with hosts other than the MSP430F149.                                    */
/*                                                                          */
/* The following MSP430F149-specific code can be used as a reference as to  */
/* how to implement the required JTAG communication on additional hosts.    */
/****************************************************************************/

//-------------------------------
//  combinations of sbw-cycles (TMS, TDI, TDO)
void TMSL_TDIL(void)
{
    unsigned long flags = 0;
   
    DisableInterrupts(flags);
    TMSL  TDIL  TDOsbw
    EnableInterrupts(flags);

}
//---------------------------------
void TMSH_TDIL(void)
{
    unsigned long flags = 0;

    DisableInterrupts(flags);
    TMSH  TDIL  TDOsbw
    EnableInterrupts(flags);
}
//------------------------------------
void TMSL_TDIH(void)
{
    unsigned long flags = 0;

    DisableInterrupts(flags);
    TMSL  TDIH  TDOsbw
    EnableInterrupts(flags);
}
//-------------------------------------
void TMSH_TDIH(void)
{
    unsigned long flags = 0;

    DisableInterrupts(flags);
    TMSH  TDIH  TDOsbw
    EnableInterrupts(flags);
}
//------------------------------------
void TMSL_TDIH_TDOrd(void)
{
    unsigned long flags = 0;

    DisableInterrupts(flags);
    TMSL  TDIH  TDO_RD
    EnableInterrupts(flags);
}
//------------------------------------
void TMSL_TDIL_TDOrd(void)
{
    unsigned long flags = 0;

    DisableInterrupts(flags);
    TMSL  TDIL  TDO_RD
    EnableInterrupts(flags);
}
//------------------------------------
void TMSH_TDIH_TDOrd(void)
{
    unsigned long flags = 0;

    DisableInterrupts(flags);
    TMSH  TDIH  TDO_RD
    EnableInterrupts(flags);
}
//------------------------------------
void TMSH_TDIL_TDOrd(void)
{
    unsigned long flags = 0;

    DisableInterrupts(flags);
    TMSH  TDIL  TDO_RD
    EnableInterrupts(flags);
}
//----------------------------------------------
// enters with TCLK_saved and exits with TCLK = 0
void ClrTCLK_sbw(void)
{
    unsigned long flags = 0;

    DisableInterrupts(flags);
    if (TCLK_saved)
    {
        TMSLDH
    }
    else
    {
        TMSL
    }

    ClrSBWTDIO();

    TDIL TDOsbw    //ExitTCLK
    TCLK_saved = 0;
    EnableInterrupts(flags);
}

//----------------------------------------------
// enters with TCLK_saved and exits with TCLK = 1
void SetTCLK_sbw(void)
{
   unsigned long flags = 0;

   DisableInterrupts(flags);
   if (TCLK_saved)
   {
        TMSLDH
   }
   else
   {
        TMSL
   }

   SetSBWTDIO();

   TDIH TDOsbw    //ExitTCLK
   TCLK_saved = 1;
   EnableInterrupts(flags);
}

//----------------------------------------------------------------------------
/*  Shift a value into TDI (MSB first) and simultaneously shift out a value
    from TDO (MSB first).
    Arguments: word Format (number of bits shifted, 8 (F_BYTE), 16 (F_WORD), 
               20 (F_ADDR) or 32 (F_LONG))
               unsigned long Data (data to be shifted into TDI)
    Result:    unsigned long (scanned TDO value)
*/

unsigned long AllShifts(word Format, unsigned long Data)
{
   unsigned long TDOword = 0x00000000;
   unsigned long MSB = 0x00000000;
   word i;
   //unsigned long flags = 0;

   //DisableInterrupts(flags);
   switch(Format)
   {
   case F_BYTE: MSB = 0x00000080;
     break;
   case F_WORD: MSB = 0x00008000;
     break;
   case F_ADDR: MSB = 0x00080000;
     break;
   case F_LONG: MSB = 0x80000000;
     break;
   default: // this is an unsupported format, function will just return 0
     //EnableInterrupts(flags);
     return TDOword;
   }
   // shift in bits
   for (i = Format; i > 0; i--)
   {
        if (i == 1)                     // last bit requires TMS=1; TDO one bit before TDI
        {
          ((Data & MSB) == 0) ? TMSH_TDIL_TDOrd() : TMSH_TDIH_TDOrd();
        }
        else
        {
          ((Data & MSB) == 0) ? TMSL_TDIL_TDOrd() : TMSL_TDIH_TDOrd();
        }
        Data <<= 1;
        if (tdo_bit)
            TDOword++;
        if (i > 1)
            TDOword <<= 1;               // TDO could be any port pin
   }
   TMSH_TDIH();                         // update IR
   if (TCLK_saved)
   {
        TMSL_TDIH();
   }
   else
   {
        TMSL_TDIL();
   }

   // de-scramble bits on a 20bit shift
   if(Format == F_ADDR)
   {
     TDOword = ((TDOword << 16) + (TDOword >> 4)) & 0x000FFFFF;
   }
   //EnableInterrupts(flags);
   
   return(TDOword);
}

void	DrvSignals(void)
{
	SetSBWTDIO();
	ClrSBWTCK();
}

void	RlsSignals(void)
{
	SetSBWTDIO();
	ClrSBWTCK();
}

void	InitTarget(void)
{
	DrvSignals();
}

void	ReleaseTarget(void)
{
	RlsSignals();
}


/****************************************************************************/
/*                         END OF SOURCE FILE                               */
/****************************************************************************/