at91dbgu.c

包含makefile config.h rominit romstart userinit 等等文件

/* sndsSio.c - Samsung SNDS100 serial driver */

/*
modification history
--------------------
*/

/*
DESCRIPTION

INCLUDES:
sndsSio.h sioLib.h
*/

#include "sioLib.h"
#include "intLib.h"
#include "errno.h"
#include "ioLib.h"


#define AT91DBGU_BAUD_MIN	1200
#define AT91DBGU_BAUD_MAX	460800
							
/* for backward compatibility */

#ifndef	SIO_HUP
#   define SIO_OPEN	0x100A	/* open channel, raise DTR, RTS */
#   define SIO_HUP	0x100B	/* hang-up, lower DTR, RTS */
#endif

/* forward static declarations */
void AT91_PDC_Close ( PDC_S * pPDC );       

LOCAL int	AT91DBGUTxStartup (SIO_CHAN * pSioChan);
LOCAL int	AT91DBGUCallbackInstall (SIO_CHAN *pSioChan, int callbackType,
				    STATUS (*callback)(), void *callbackArg);
LOCAL int	AT91DBGUPollOutput (SIO_CHAN *pSioChan, char	outChar);
LOCAL int	AT91DBGUPollInput (SIO_CHAN *pSioChan, char *thisChar);
LOCAL int	AT91DBGUIoctl (SIO_CHAN *pSioChan, int request, void *arg );

LOCAL STATUS dummyCallback (void);

/* local variables */

LOCAL	SIO_DRV_FUNCS AT91DBGUDrvFuncs =
{
    AT91DBGUIoctl,
    AT91DBGUTxStartup,
    AT91DBGUCallbackInstall,
    AT91DBGUPollInput,
    AT91DBGUPollOutput,
};



/******************************************************************************
*
* AT91DevInit - initialize a SNDS_DUSART
*
* This routine initializes the driver
* function pointers and then resets the chip in a quiescent state.
* The BSP must have already initialized all the device addresses and the
* baudFreq fields in the SNDS_DUSART structure before passing it to
* this routine.
*
* RETURNS: N/A
*/

void AT91DBGUDevInit
(
    AT91_DBGU_CHAN * pChan
)
{
    UINT32 dummy;
	/* initialize each channel's driver function pointers */
    int oldlevel;
	
    pChan->sio.pDrvFuncs	= &AT91DBGUDrvFuncs;

    /* install dummy driver callbacks */

    pChan->getTxChar    = dummyCallback;
    pChan->putRcvChar	= dummyCallback;
    
    /* reset the chip */
	 oldlevel = intLock ();
	
    pChan->regs->DBGU_CR = DBGU_CR_RESET_RECV | DBGU_CR_RESET_TRAN | DBGU_CR_RX_DIS | DBGU_CR_TX_DIS;
	pChan->regs->DBGU_MR = DBGU_MR_PARITY_NONE | DBGU_MR_TEST_NORMAL_MODE;
	/*
	 *	disable all interrupt source first
	 */
	pChan->regs->DBGU_IDR = 0xFFFFFFFF;
	dummy = pChan ->regs->DBGU_RHR;
    intUnlock ( oldlevel );
	pChan->intrmode = FALSE;
	
	/*
	 *	Init PDC, disable all pdc function
	 */
	AT91_PDC_Close( &(pChan->regs->DBGU_PDC) );
	/*
	 *	make a dummy read emtpy the receive buf
	 */
	
    /* setting polled mode is one way to make the device quiet */
	AT91DBGUIoctl ( (SIO_CHAN *)pChan, SIO_BAUD_SET, (void *)pChan->baudRate );
    AT91DBGUIoctl ( (SIO_CHAN *)pChan, SIO_MODE_SET,(void *)SIO_MODE_POLL );

	pChan->regs->DBGU_CR = DBGU_CR_RX_ENA | DBGU_CR_TX_DIS | DBGU_CR_RESET_STATUS;
}

/******************************************************************************
*
* sndsDevInit2 - initialize a SNDS_DUSART, part 2
*
* This routine is called by the BSP after interrupts have been connected.
* The driver can now operate in interrupt mode.  Before this routine is
* called only polled mode operations should be allowed.
*
* RETURNS: N/A
* ARGSUSED
*/

void AT91DBGUDevInit2
    (
    AT91_DBGU_CHAN * pChan		/* device to initialize */
    )
{
	pChan ->errcount = 0;
	pChan->regs->DBGU_CR = DBGU_CR_RX_ENA | DBGU_CR_TX_DIS | DBGU_CR_RESET_STATUS;
	/*
	 *	enable DBGU interrupt now.
	 */
    pChan->regs->DBGU_IER = DBGU_IE_DR_TXRDY | DBGU_IE_DR_RXRDY | DBGU_IE_DR_FRAME 
					| DBGU_IE_DR_PARE| DBGU_IE_DR_OVRE;

	pChan->intrmode = TRUE;
}

/******************************************************************************
*
* sndsIntRcv - handle a channel's receive-character interrupt
*
* RETURNS: N/A
*/ 

void AT91DBGUInt
    (
    AT91_DBGU_CHAN *	pChan		/* channel generating the interrupt */
    )
{
    
	char outchar;
	UINT32	    status;

	DBGU_S* udev = pChan ->regs;
	
	status = udev->DBGU_CSR;
	if( status&( DBGU_CSR_FRAME | DBGU_CSR_OVRE| DBGU_CSR_PARE ) )
	{
		pChan->errcount ++;
		udev->DBGU_CR = DBGU_CR_RESET_STATUS;
	}

	if( status&(DBGU_CSR_RXRDY ) )
	{
		(*pChan->putRcvChar) ( pChan->putRcvArg, udev ->DBGU_RHR );
	}

	if( status&( DBGU_CSR_TXRDY ) )
	{
		if( (*pChan->getTxChar) (pChan->getTxArg, &outchar) != ERROR )
		{
			udev ->DBGU_THR = (AT91_REG)(outchar);
		}
		else
		{
			udev ->DBGU_CR = DBGU_CR_TX_DIS;
		}
	}
}


/******************************************************************************
*
* sndsTxStartup - start the interrupt transmitter
*
* RETURNS: OK on success, ENOSYS if the device is polled-only, or
* EIO on hardware error.
*/

LOCAL int AT91DBGUTxStartup
    (
    SIO_CHAN * pSioChan                 /* channel to start */
    )
{
    AT91_DBGU_CHAN * pChan = (AT91_DBGU_CHAN *)pSioChan;
	
	if( pChan ->intrmode == TRUE )
	{
		pChan ->regs->DBGU_CR = DBGU_CR_TX_ENA;
		return OK;
	}
	else 
		return ENOSYS;
}

/******************************************************************************
*
* sndsCallbackInstall - install ISR callbacks to get/put chars
*
* This driver allows interrupt callbacks for transmitting characters
* and receiving characters. In general, drivers may support other
* types of callbacks too.
*
* RETURNS: OK on success, or ENOSYS for an unsupported callback type.
*/ 

LOCAL int AT91DBGUCallbackInstall
    (
    SIO_CHAN *	pSioChan,               /* channel */
    int		callbackType,           /* type of callback */
    STATUS	(*callback)(),          /* callback */
    void *      callbackArg             /* parameter to callback */
    )
{
    AT91_DBGU_CHAN * pChan = (AT91_DBGU_CHAN *)pSioChan;
    switch (callbackType)
	{
	case SIO_CALLBACK_GET_TX_CHAR:
	    pChan->getTxChar	= callback;
	    pChan->getTxArg	= callbackArg;
	    return (OK);

	case SIO_CALLBACK_PUT_RCV_CHAR:
	    pChan->putRcvChar	= callback;
	    pChan->putRcvArg	= callbackArg;
	    return (OK);

	default:
	    return (ENOSYS);
	}
}

/*******************************************************************************
*
* sndsPollOutput - output a character in polled mode
*
* RETURNS: OK if a character arrived, EIO on device error, EAGAIN
* if the output buffer if full. ENOSYS if the device is
* interrupt-only.
*/

LOCAL int AT91DBGUPollOutput
    (
    SIO_CHAN *	pSioChan,
    char	outChar
    )
{
    AT91_DBGU_CHAN * pChan = (AT91_DBGU_CHAN *)pSioChan;
    DBGU_S* udev;
	UINT32	status;

	udev = pChan ->regs;
    /* is the transmitter ready to accept a character? */
	status = udev ->DBGU_CSR;

	if( status&( DBGU_CSR_FRAME | DBGU_CSR_OVRE| DBGU_CSR_PARE ) )
	{
		pChan->errcount ++;
		udev->DBGU_CR = DBGU_CR_RESET_STATUS;
	}

	if( status&(DBGU_CSR_TXRDY) )
	{
		udev ->DBGU_THR = (AT91_REG)(outChar);
		return (OK);
	}
	else
		return (EAGAIN);
}

/******************************************************************************
*
* sndsPollInput - poll the device for input
*
* RETURNS: OK if a character arrived, EIO on device error, EAGAIN
* if the input buffer if empty, ENOSYS if the device is
* interrupt-only.
*/

LOCAL int AT91DBGUPollInput
    (
    SIO_CHAN *	pSioChan,
    char *	thisChar
    )
{
    AT91_DBGU_CHAN * pChan = (AT91_DBGU_CHAN *)pSioChan;
    DBGU_S* udev;
	UINT32	status;
	
	udev = pChan ->regs;
	status = udev ->DBGU_CSR;
	
	if( status&( DBGU_CSR_FRAME | DBGU_CSR_OVRE| DBGU_CSR_PARE ) )
	{
		pChan->errcount ++;
		udev->DBGU_CR = DBGU_CR_RESET_STATUS;
	}
	
	if( status&(DBGU_CSR_RXRDY) )
	{
		status = udev ->DBGU_RHR;
		(*thisChar) = (BYTE)status;
	    return (OK);
    }
	else
		return (EAGAIN);
}
/******************************************************************************
*
* sndsModeSet - toggle between interrupt and polled mode
*
* RETURNS: OK on success, EIO on unsupported mode.
*/


/*
 *	because DBUG use the system interrupt line, we can not use intDisable/intEnable
 *	as normal UART 
 */
LOCAL int AT91DBGUModeSet
    (
    AT91_DBGU_CHAN * pChan,		/* channel */
    int	newMode        	/* new mode */
    )
{
    UINT32	temp;
    if ( (newMode != SIO_MODE_POLL) && (newMode != SIO_MODE_INT) )	
		return (EIO);


    /* Don't enter interrupt mode unless it is allowed. */

    if ( (newMode == SIO_MODE_INT) && ( pChan ->intrmode ) )
		return (EIO);