systffs.c

来自「MPC5200 BSP 支持ATA,USB, I2C,扩展网口」· C语言 代码 · 共 507 行 · 第 1/2 页

/*******************************************************************************
*
* FLASH32VccOff - turn off Vcc (3.3/5 Volts)
*
* This routine turns off Vcc (3.3/5 Volts). 
*
* RETURNS: N/A
*/

LOCAL void FLASH32VccOff ( FLSocket vol )
{
}

#ifdef SOCKET_12_VOLTS

/*******************************************************************************
*
* FLASH32VppOn - turns on Vpp (12 Volts)
*
* This routine turns on Vpp (12 Volts). Vpp must be known to be good on exit.
*
* RETURNS: flOK always.
*/

LOCAL FLStatus FLASH32VppOn( FLSocket vol )
{
    return (flOK);
}

/*******************************************************************************
*
* FLASH32VppOff - turns off Vpp (12 Volts)
*
* This routine turns off Vpp (12 Volts).
*
* RETURNS: N/A
*/

LOCAL void FLASH32VppOff ( FLSocket vol )
{
}

#endif	/* SOCKET_12_VOLTS */

/*******************************************************************************
*
* FLASH32InitSocket - perform all necessary initializations of the socket
*
* This routine performs all necessary initializations of the socket.
*
* RETURNS: flOK always.
*/

LOCAL FLStatus FLASH32InitSocket ( FLSocket vol )
{
    vol.cardChanged = FALSE;

    /* enable memory window and map it at address 0 */
    FLASH32SetWindow (&vol);

    return (flOK);
}

/*******************************************************************************
*
* FLASH32SetWindow - set current window attributes, Base address, size, etc
*
* This routine sets current window hardware attributes: Base address, size,
* speed and bus width.  The requested settings are given in the 'vol.window' 
* structure.  If it is not possible to set the window size requested in
* 'vol.window.size', the window size should be set to a larger value, 
* if possible. In any case, 'vol.window.size' should contain the 
* actual window size (in 4 KB units) on exit.
*
* RETURNS: N/A
*/

LOCAL void FLASH32SetWindow ( FLSocket vol )
{    
    vol.window.baseAddress = g_tffs_DataBase >> 12;/* Physical base as a 4K page */
    vol.window.size     = g_tffs_DataSize ;        /* data area size */
    vol.window.base =  (void *)g_tffs_DataBase;
    vol.window.currentPage = UNDEFINED_MAPPING;	/* force remapping */
    
    vol.window.busWidth = 8 ;  /* use 16-bits */
    vol.window.speed    = 120;  /* 120 nsec. */

}

/*******************************************************************************
*
* FLASH32SetMappingContext - sets the window mapping register to a card address
*
* This routine sets the window mapping register to a card address.
* The window should be set to the value of 'vol.window.currentPage',
* which is the card address divided by 4 KB. An address over 128MB,
* (page over 32K) specifies an attribute-space address.
*
* The page to map is guaranteed to be on a full window-size boundary.
*
* RETURNS: N/A
*/

LOCAL void FLASH32SetMappingContext (FLSocket vol, unsigned page )/* page to be mapped */
{
}
/*******************************************************************************
*
* FLASH32GetAndClearCardChangeIndicator - return the hardware card-change indicator
*
* This routine returns the hardware card-change indicator and clears it if set.
*
* RETURNS: FALSE, or TRUE if the card has been changed
*/

LOCAL FLBoolean FLASH32GetAndClearCardChangeIndicator  ( FLSocket vol )
{  
    return (FALSE);  
}

/*******************************************************************************
*
* FLASH32WriteProtected - return the write-protect state of the media
*
* This routine returns the write-protect state of the media
*
* RETURNS: FALSE, or TRUE if the card is write-protected
*/

LOCAL FLBoolean FLASH32WriteProtected ( FLSocket vol )
{ 
    return (FALSE); 
}
#endif	/* INCLUDE_SOCKET_FLASH32 */

/*******************************************************************************
*
* flFitInSocketWindow - check whether the flash array fits in the socket window
*
* This routine checks whether the flash array fits in the socket window.
*
* RETURNS: A chip size guaranteed to fit in the socket window.
*/

long int flFitInSocketWindow 
    (
    long int chipSize,		/* size of single physical chip in bytes */
    int      interleaving,	/* flash chip interleaving (1,2,4 etc) */
    long int windowSize		/* socket window size in bytes */
    )
{
    if (chipSize*interleaving >  windowSize) /* doesn't fit in socket window */
        {
        int  roundedSizeBits;

        /* fit chip in the socket window */
        chipSize = windowSize / interleaving;

        /* round chip size at powers of 2 */
        for (roundedSizeBits = 0; (0x1L << roundedSizeBits) <= chipSize;roundedSizeBits++)
	    ;

        chipSize = (0x1L << (roundedSizeBits - 1));
        }

    return (chipSize);
}

/*******************************************************************************
*
* flDelayMsecs - wait for specified number of milliseconds
*
* This routine waits for specified number of milliseconds.
*
* RETURNS: N/A
*
* NOMANUAL
*/

void flDelayMsecs
    (
    unsigned milliseconds       /* milliseconds to wait */
    )
    {
    UINT32 ix1;
    UINT32 ix;
    UINT32 iy = 1;
    UINT32 iz = 2;

    /* it doesn't count time consumed in interrupt level */

    for (ix1 = 0; ix1 < milliseconds; ix1++)
        for (ix = 0; ix < sysTffsMsecLoopCount; ix++)
	    {
	    tickGet ();			/* dummy */
	    iy = KILL_TIME_FUNC;	/* consume time */
	    }
    }

/*******************************************************************************
*
* flDelayLoop - consume the specified time
*
* This routine consumes the specified time.
*
* RETURNS: N/A
*/

void flDelayLoop 
    (
    int  cycles
    )
    {
    while (--cycles)
	;
    }

/*******************************************************************************
*
* sysTffsFormat - format the flash memory above an offset
*
* This routine formats the flash memory.  Because this function defines 
* the symbolic constant, HALF_FORMAT, the lower half of the specified flash 
* memory is left unformatted.  If the lower half of the flash memory was
* previously formated by TrueFFS, and you are trying to format the upper half,
* you need to erase the lower half of the flash memory before you format the
* upper half.  To do this, you could use:
* .CS
* tffsRawio(0, 3, 0, 8)  
* .CE
* The first argument in the tffsRawio() command shown above is the TrueFFS 
* drive number, 0.  The second argument, 3, is the function number (also 
* known as TFFS_PHYSICAL_ERASE).  The third argument, 0, specifies the unit 
* number of the first erase unit you want to erase.  The fourth argument, 8,
* specifies how many erase units you want to erase.  
*
* RETURNS: OK, or ERROR if it fails.
*/

STATUS sysTffsFormat(void) 
{
    STATUS status;
    tffsDevFormatParams params  =
	{{0, 99, 1, 0x10000L, NULL, {0,0,0,0}, NULL, 2, 0, NULL},
	  FTL_FORMAT_IF_NEEDED };
    params.formatParams.vmAddressingLimit=g_tffs_BlkSize;
    status = tffsDevFormat(0, (int)&params);
    return (status);
}