ppc860scc.c

基于如何开发MPC860处理器系统的核心业务模块QMC的开发程序

#include "copyright_wrs.h"

/*
modification history
--------------------
2000.6.6 copy from ppc860sio.c
*/

/* includes */

#include "vxWorks.h"
#include "intLib.h"
#include "errno.h"
#include "sioLib.h"
#include "drv/multi/ppc860Siu.h"
#include "drv/multi/ppc860Cpm.h"
#include "drv/sio/ppc860Sio.h"
#include "mpc860p.h"
/* defines */

#define DEFAULT_BAUD 9600

/* forward declarations */

static STATUS ppc860SccIoctl (PPC860SCC_CHAN *pChan,int request,int arg);
static void   ppc860SccResetChannel (PPC860SCC_CHAN *pChan);
static int    ppc860SccPollOutput (SIO_CHAN *,char);
static int    ppc860SccPollInput (SIO_CHAN *,char *);
static void   ppc860SccStartup (PPC860SCC_CHAN *);
static int    ppc860SccCallbackInstall (SIO_CHAN *, int, STATUS (*)(), void *);

/* local driver function table */

static SIO_DRV_FUNCS ppc860SccDrvFuncs =
    {
    (int (*)())			ppc860SccIoctl,
    (int (*)())			ppc860SccStartup,
    				ppc860SccCallbackInstall,
    (int (*)())			ppc860SccPollInput,
    (int (*)(SIO_CHAN *,char))	ppc860SccPollOutput
    };

/******************************************************************************
*
*
* ppc860DevInit - initialize the SCC
*
* This routine is called to initialize the chip to a quiescent state.
* Note that the `smcNum' field of PPC860SCC_CHAN must be either 1 or 2.
*/

void ppc860SccDevInit
    (
    PPC860SCC_CHAN *pChan
    )
    {
    /* masks off this SCC's interrupt. */
	
    * CIMR(pChan->regBase) &= ~CIMR_SCC3 ;
    
    pChan->baudRate  = DEFAULT_BAUD;
    pChan->pDrvFuncs = &ppc860SccDrvFuncs;
    }

/******************************************************************************
*
*
* ppc860ResetChannel - initialize the SCC
*/

static void ppc860SccResetChannel 
    (
    PPC860SCC_CHAN *pChan
    )
    {
    int frame;

    int oldlevel = intLock ();	/* lock interrupts */ 

    pChan->uart.intMask = CIMR_SCC3;
    
    /* set up SCC3 as NMSI, select Baud Rate Generator */

    * SICR(pChan->regBase) |= 0x00090000;
	 
    /* reset baud rate generator, wait for reset to clear... */
 
    *pChan->pBaud |= BRGC_RST;
    while (*pChan->pBaud & BRGC_RST);

    ppc860SccIoctl (pChan, SIO_BAUD_SET, pChan->baudRate);

    /* set up transmit buffer descriptors */
	pChan->uart.txBdBase = (SCC_BUF *) (pChan->regBase +
		         ((UINT32) pChan->uart.txBdBase ));
    pChan->uart.pScc->param.tbase = (UINT16) SCC3_TBD_OFF;
    pChan->uart.pScc->param.tbptr = (UINT16) SCC3_TBD_OFF;
    pChan->uart.txBdNext = 0;

    /* initialize each transmit buffer descriptor */

    for (frame = 0; frame < pChan->uart.txBdNum; frame++)
        {
        pChan->uart.txBdBase[frame].statusMode = 0x9000;

        pChan->uart.txBdBase[frame].dataPointer = pChan->uart.txBufBase +
                                          (frame * pChan->uart.txBufSize);
        }

    /* set the last BD to wrap to the first */

    pChan->uart.txBdBase[(frame - 1)].statusMode |= 0x2000;

    /* set up receive buffer descriptors */

    pChan->uart.rxBdBase = (SCC_BUF *) (pChan->regBase +
		         ((UINT32) pChan->uart.rxBdBase ));

    pChan->uart.pScc->param.rbase = (UINT16) SCC3_RBD_OFF;
    pChan->uart.pScc->param.rbptr = (UINT16) SCC3_RBD_OFF;
    pChan->uart.rxBdNext = 0;

    /* initialize each receive buffer descriptor */
	
    for (frame = 0; frame < pChan->uart.rxBdNum; frame++)
        {
        pChan->uart.rxBdBase[frame].statusMode = 0x9000;
        pChan->uart.rxBdBase[frame].dataLength = 1; /* char oriented */
        pChan->uart.rxBdBase[frame].dataPointer = pChan->uart.rxBufBase + 
frame;
        }

    /* set the last BD to wrap to the first */

    pChan->uart.rxBdBase[(frame - 1)].statusMode |= 0x2000;

    /* set SCC attributes to standard UART mode */

    pChan->uart.pSccReg->gsmrl = 0x00028004;
	pChan->uart.pSccReg->gsmrh = 0x00000020;
	pChan->uart.pSccReg->psmr = 0xb000;
	
    /* initialize parameter RAM area for this SMC */

    pChan->uart.pScc->param.rfcr       = 0x18;	/* supervisor data access */
    pChan->uart.pScc->param.tfcr       = 0x18;	/* supervisor data access */
    pChan->uart.pScc->param.mrblr      = 0x1;	/* one character rx buffers */
    pChan->uart.pScc->proto.maxIdl     = 0x0;	/* maximum idle characters */
    pChan->uart.pScc->proto.brkcr      = 1;		/* break count register (transmit) */
    pChan->uart.pScc->proto.parec      = 0;		/* receive parity error counter */
    pChan->uart.pScc->proto.frmer      = 0;		/* receive framing error counter */
    pChan->uart.pScc->proto.nosec      = 0;		/* receive noise counter */
    pChan->uart.pScc->proto.brkec      = 0;		/* receive break condition counter */
    pChan->uart.pScc->proto.uaddr1     = 0;		/* uart address character 1 */
    pChan->uart.pScc->proto.uaddr2     = 0;		/* uart address character 2 */
    pChan->uart.pScc->proto.toseq 	   = 0;		/* transmit out-of-sequence character */
    pChan->uart.pScc->proto.character1 = 0x8000;
    pChan->uart.pScc->proto.character2 = 0x8000;
    pChan->uart.pScc->proto.character3 = 0x8000;		
    pChan->uart.pScc->proto.character4 = 0x8000;		
    pChan->uart.pScc->proto.character5 = 0x8000;		
    pChan->uart.pScc->proto.character6 = 0x8000;		
    pChan->uart.pScc->proto.character7 = 0x8000;		
    pChan->uart.pScc->proto.character8 = 0x8000;		
    pChan->uart.pScc->proto.rccm 	   = 0xc0ff;		
    
    /* clear all events */

    pChan->uart.pSccReg->scce = 0x0067;

    /* enables the transmitter and receiver  */

   pChan->uart.pSccReg->gsmrl = 0x00028034;

    /* unmask interrupt (Tx, Rx only) */

    pChan->uart.pSccReg->sccm  = 0x0003;
    *CIMR(pChan->regBase) |= pChan->uart.intMask;

    intUnlock (oldlevel);			/* UNLOCK INTERRUPTS */
    }

/******************************************************************************
*
*
* ppc860Ioctl - special device control
*
* RETURNS: OK on success, EIO on device error, ENOSYS on unsupported
*          request.
*
*/

LOCAL STATUS ppc860SccIoctl
    (
    PPC860SCC_CHAN *	pChan,		/* device to control */
    int			request,	/* request code */
    int			arg		/* some argument */
    )
    {
    int		baudRate;
    int 	oldlevel;
    STATUS 	status = OK;

    switch (request)
	{
	case SIO_BAUD_SET:
            if (arg >=  50 && arg <= 38400)	/* could go higher... */
		{
		/* calculate proper counter value, then enable BRG */

		baudRate = (pChan->clockRate + (8 * arg)) / (16 * arg);

		if (--baudRate > 0xfff)
		    *pChan->pBaud = (BRGC_CD_MSK &
		    (((baudRate + 8) / 16) << BRGC_CD_SHIFT)) | BRGC_EN |
		    BRGC_DIV16;
                else
                    *pChan->pBaud = (BRGC_CD_MSK & 
			(baudRate << 1)) | BRGC_EN;

                pChan->baudRate = arg;
		}
            else
	        status = EIO;
	    break;
    
	case SIO_BAUD_GET:
	    * (int *) arg = pChan->baudRate;
	    break;

	case SIO_MODE_SET:
            if (!((int) arg == SIO_MODE_POLL || (int) arg == SIO_MODE_INT))
                {
                status = EIO;
                break;
                }

            /* lock interrupt  */

            oldlevel = intLock();

            /* initialize channel on first MODE_SET */

            if (!pChan->channelMode)
                ppc860SccResetChannel(pChan);

            /*
             * if switching from POLL to INT mode, wait for all characters to
             * clear the output pins
             */

            if ((pChan->channelMode == SIO_MODE_POLL) && (arg == SIO_MODE_INT))
                {
		int i;

                for (i=0; i < pChan->uart.txBdNum; i++)
                    while (pChan->uart.txBdBase
                           [(pChan->uart.txBdNext + i) % pChan->uart.txBdNum].
                           statusMode & BD_TX_READY_BIT);

                }

            if (arg == SIO_MODE_INT)
		{
                * CISR(pChan->regBase) = pChan->uart.intMask;
				/* reset the SCC's interrupt status bit */

		* CIMR(pChan->regBase) |= pChan->uart.intMask;
				/* enable this SCC's interrupt  */

		pChan->uart.pSccReg->scce = 0x0001;	
				/* reset the receiver status bit */ 

                pChan->uart.pSccReg->sccm = 0x0003;
				/* enables receive and transmit interrupts */
		}
            else
		{
                pChan->uart.pSccReg->sccm = 0;
				/* mask off the receive and transmit intrs */

		* CIMR(pChan->regBase) &= (~(pChan->uart.intMask));
				/* mask off this SCC's interrupt */ 

                }

            pChan->channelMode = arg;

            intUnlock(oldlevel);