sysscc.c

这是WINDRIVER公司所开发的针对freescale公司最新的powerpc系列MPC8560的针对vxworks的bsp。对做powerpc嵌入式的很有用了。

/* sysScc.c -  M8560 SCC UART BSP serial device initialization */

/* Copyright 1984-2004 Wind River Systems, Inc. */
#include "copyright_wrs.h"

/*
modification history
--------------------
01k,10aug04,dtr  Fix SCC pins so just three pin usage. SPR 100725
01j,26aug03,dtr  Using 82xx DramLib for buffer allocation.
01i,01aug03,dtr  Using CCSBAR for DPRAM base adrs.
01h,17oct01,jrs  Upgrade to veloce
		 corrected SCC2 initialization in sysSerialHwInit() - SPR #64407
		 removed useless init of baud rate generators - SPR #88989
01g,09sep99,ms_  change bsp name from vads8260 to ads8260
01f,15jul99,ms_  make compliant with our coding standards
01e,19apr99,ms_  adhere to coding conventions
01d,14apr99,ms_  switch from using interrupt vectors to interrupt numbers
01c,08apr99,ms_  upgrade to multiple channels
01b,05apr99,ms_  upgrade to support two channels
01a,21jan99,ms_  adapted from sysSerial.c for ads860 
*/

/*
DESCRIPTION

This library contains routines for M8260 SMC UART BSP serial device
initialization. Although this is a MPC8560 the 8260 CPM library has 
leveraged. 
*/

#include "vxWorks.h"
#include "iv.h"
#include "intLib.h"
#include "config.h"
#include "sysLib.h"
#include "drv/sio/m8260Scc.h"
#include "drv/sio/m8260Sio.h"
#include "drv/parallel/m8260IOPort.h"
#include "drv/sio/m8260Brg.h"
#include "ads85xx.h"

#define SCC_BASE (CCSBAR + 0x80000)

M8260_SCC_CHAN m8260SccChan1;
M8260_SCC_CHAN m8260SccChan2;
char * bufferBase;

/******************************************************************************
*
* sysSerialHwInit - initialize the BSP serial devices to a quiesent state
*
* This routine initializes the BSP serial device descriptors and puts the
* devices in a quiesent state.  It is called from sysHwInit() with
* interrupts locked.
*
* Buffers and Buffer Descriptors for the two channels:
* 
* .CS
*                                                   Address per SCC
*                                               ---------------------------
* field                                 size    SCC1            SCC2
* ------                                ------- -----------     -----------
* Receive Buffer Descriptor             8 bytes 0xFE08_0000     0xFE08_0100
* Receive Buffer Status                 2 bytes 0xFE08_0000     0xFE08_0100
* Receive Buffer Length                 2 bytes 0xFE08_0002     0xFE08_0102
* Pointer to Receive Buffer             4 bytes 0xFE08_0004     0xFE08_0104
* Receive Buffer                        1 bytes 0xFE08_0040     0xFE08_0140
*
* Transmit Buffer Descriptor            8 bytes 0xFE08_0008     0xFE08_0108
* Transmit Buffer Status                2 bytes 0xFE08_0008     0xFE08_0108
* Transmit Buffer Length                2 bytes 0xFE08_000A     0xFE08_010A
* Transmit to Receive Buffer            4 bytes 0xFE08_000C     0xFE08_010C
* Transmit Buffer                       1 bytes 0xFE08_0060     0xFE08_0160
* .CE
*
*
*
* RETURNS: N/A
*/ 

void sysSerialHwInit (void)
    {

    UINT32 immrVal = SCC_BASE;

    /* SCC1 */
    /* PD31 RXD - input
     * PD30 TXD - output
     */
    * M8260_IOP_PDDIR(immrVal) &= ~(PD31 | PC30);
    * M8260_IOP_PDDIR(immrVal) |= (PD30);
    * M8260_IOP_PDPAR(immrVal) |= (PD31 | PD30);
    * M8260_IOP_PDSO(immrVal) &= ~(PD31 | PD30);
    * M8260_IOP_PDSO(immrVal) |= PD30;

if (NUM_TTY>=2)
    {
    /* SCC2 */
    /* PB15 RXD - input
     * PD27 TXD - output
     */
    * M8260_IOP_PDDIR(immrVal) &= ~(PD27);
    * M8260_IOP_PDDIR(immrVal) |= (PD27);
    * M8260_IOP_PDPAR(immrVal) |= (PD27);
#ifndef INCLUDE_SECONDARY_FCC_END /* FCC3 clashes with PB15 */
    * M8260_IOP_PBDIR(immrVal) &= ~(PB15);
    * M8260_IOP_PBPAR(immrVal) |= (PB15);
    * M8260_IOP_PBSO(immrVal) &= ~(PB15);
#else /* if FCC3 used then then pin to use is PD28 as secondary option */
    * M8260_IOP_PDDIR(immrVal) &= ~(PD28);
    * M8260_IOP_PDPAR(immrVal) |= (PD28);
    * M8260_IOP_PDSO(immrVal) &= ~(PD28);
#endif
    * M8260_IOP_PDSO(immrVal) &= ~(PD27);

    } 
    /* CPM muxs */

    /* for the value of 0x0009121B:
     * field    description     SCC1    SCC2    SCC3    SCC4
     * GR       Grant Support   <-----always asserted------>
     * SC       SCC connection  <---not connected to TSA--->
     * RSxCS    Rcv Clk Source  BRG1    BRG2    BRG3    BRG4
     * TSxCS    Tx Clk Source   BRG1    BRG2    BRG3    BRG4
     */

    * M8260_CMXSCR(immrVal) = 0x0009121B;


    /* intialize the two serial channels */
    
    /* this is in order of the structure contents */

    /* indicate that this is a fresh device */
    m8260SccChan1.channelMode = 0;
    m8260SccChan2.channelMode = 0;

    m8260SccChan1.baudRate = DEFAULT_BAUD;
    m8260SccChan2.baudRate = DEFAULT_BAUD;

    m8260SccChan1.sccNum = 1;
    m8260SccChan2.sccNum = 2;

    m8260SccChan1.immrVal = immrVal;
    m8260SccChan2.immrVal = immrVal;

    bufferBase = (char *)m82xxDpramAlignedMalloc(0x200,0x100);
    
    memset ((char*)bufferBase,0x0,0x200);
    m8260SccChan1.pBdBase = (char *) ((UINT32)bufferBase + 0x000);
    m8260SccChan1.rcvBufferAddr = (char *) ((UINT32)bufferBase + 0x040);
    m8260SccChan1.txBufferAddr = (char *) ((UINT32)bufferBase + 0x060);

    m8260SccChan2.pBdBase = (char *) ((UINT32)bufferBase + 0x100);
    m8260SccChan2.rcvBufferAddr = (char *) ((UINT32)bufferBase + 0x140);
    m8260SccChan2.txBufferAddr = (char *) ((UINT32)bufferBase + 0x160);

 
    /* disable interrupts from SCC1 and SCC2 */

    m85xxCpmIntDisable(INUM_CPM_SCC1);

    if (NUM_TTY >= 2)
	m85xxCpmIntDisable(INUM_CPM_SCC2);

    /* reset the channel */

    m8260SioDevInit(&m8260SccChan1);

    if (NUM_TTY >= 2)
	m8260SioDevInit(&m8260SccChan2);

    }

/******************************************************************************
*
* sysSerialHwInit2 - connect BSP serial device interrupts
*
* This routine connects the BSP serial device interrupts.  It is called from
* sysHwInit2().  Serial device interrupts could not be connected in
* sysSerialHwInit() because the kernel memory allocator was not initialized
* at that point, and intConnect() calls malloc().
*
* RETURNS: N/A
*/ 

void sysSerialHwInit2 (void)
    {

    /* connect serial interrupts */

    (void) m85xxCpmIntConnect (INUM_CPM_SCC1, 
		      (VOIDFUNCPTR) m8260SioInt, (int*) &m8260SccChan1);
    if (NUM_TTY >= 2)
	(void) m85xxCpmIntConnect (INUM_CPM_SCC2, 
			  (VOIDFUNCPTR) m8260SioInt, (int*) &m8260SccChan2);

    }

/******************************************************************************
*
* sysSerialChanGet - get the SIO_CHAN device associated with a serial channel
*
* This routine gets the SIO_CHAN device associated with a specified serial
* channel.
*
* RETURNS: A pointer to the SIO_CHAN structure for the channel, or ERROR
* if the channel is invalid.
*/

SIO_CHAN * sysSerialChanGet
    (
    int channel		/* serial channel */
    )
    {
    if (channel == 0)
	return ((SIO_CHAN *) &m8260SccChan1); 
    else if (channel == 1)
	return ((SIO_CHAN *) &m8260SccChan2); 
    else 
	return ((SIO_CHAN *) ERROR);
    }

/*******************************************************************************
*
* sysSerialReset - reset the serail device 
*
* This function calls sysSerialHwInit() to reset the serail device
*
* RETURNS: N/A
*
*/

void sysSerialReset (void)
    {
    sysSerialHwInit ();
    }