sysserial.c

ARM7开发板 AT91EB01 BSP源代码

/* sysSerial.c - Atmel AT91EB01 serial device initialisation */

/* Copyright 1999 ARM Limited */

/*
modification history
--------------------
01b,15jul99,jpd  minor comments changes.
01a,25jun99,jpd  created.
*/

/*
DESCRIPTION
This file contains the board-specific routines for serial channel
initialisation of the UARTs built in to the AT91M40400 chip on the
AT91EB01 board.

SEE ALSO:
.I "Atmel AT91M40400 16/32-Bit Microcontroller, Data Sheet,"
.I "Atmel AT91EB01 Evaluation Board, User Guide."
*/

/* includes */

#include "vxWorks.h"
#include "iv.h"
#include "intLib.h"
#include "config.h"
#include "sysLib.h"
#include "at91Sio.h"

#include "at91Sio.c"

#ifdef INCLUDE_SERIAL

/* device initialisation structure */

typedef struct
    {
    UINT	vector;
    UINT32 *	baseAdrs;
    UINT	intLevel;
    } AT91_CHAN_PARAS;


/* Local data structures */

LOCAL AT91_CHAN_PARAS devParas[] =
    {
	{INT_VEC_USART_0, (UINT32 *)AT91_USART_0_BASE_ADRS, INT_LVL_USART_0 },
	{INT_VEC_USART_1, (UINT32 *)AT91_USART_1_BASE_ADRS, INT_LVL_USART_1 },
    };

LOCAL AT91_SIO_CHAN at91SioChan[N_AT91_USART_CHANNELS];

/*
 * Array of pointers to all serial channels configured in system.
 * See sioChanGet(). It is this array that maps channel pointers
 * to standard device names.  The first entry will become "/tyCo/0",
 * the second "/tyCo/1", and so forth.
 */

SIO_CHAN * sysSioChans [] =
    {
    &at91SioChan[0].sio,	/* /tyCo/0 */
    &at91SioChan[1].sio,	/* /tyCo/1 */
    };

/******************************************************************************
*
* sysSerialHwInit - initialise the BSP serial devices to a quiescent state
*
* This routine initialises the BSP serial device descriptors and puts the
* devices in a quiescent state.  It is called from sysHwInit() with
* interrupts locked.
*
* RETURNS: N/A
*
* SEE ALSO: sysHwInit()
*/

void sysSerialHwInit (void)
    {
    int i;

    for (i = 0; i < N_AT91_USART_CHANNELS; i++)
	{
	at91SioChan[i].regs = devParas[i].baseAdrs;
	at91SioChan[i].baudRate = CONSOLE_BAUD_RATE;
	at91SioChan[i].xtal = AT91_USART_FREQ;

	at91SioChan[i].level = devParas[i].intLevel;

	/* Set USART to be clocked from MCKI */

	AT91_USART_REG_WRITE (&at91SioChan[i], AT91_US_MR, 0);

	/*
	 * Initialise driver functions, getTxChar, putRcvChar and channelMode
	 * and otherwise initialise UART
	 */

	at91SioDevInit(&at91SioChan[i]);
	}
    }

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

void sysSerialHwInit2 (void)
    {
    int i;

    for (i = 0; i < N_AT91_USART_CHANNELS; i++)
	{
	/*
	 * We would like to check the return value from this and log a message
	 * if it failed. However, logLib has not been initialised yet, so we
	 * cannot log a message, so there's little point in checking it.
	 */

	/* connect and enable interrupts */

	(void) intConnect (INUM_TO_IVEC(devParas[i].vector),
			   at91SioInt, (int) &at91SioChan[i]);
	intEnable (devParas[i].intLevel);
	}
    }

/******************************************************************************
*
* sysSerialChanGet - get the SIO_CHAN device associated with a serial channel
*
* This routine returns a pointer to the SIO_CHAN device associated
* with a specified serial channel.  It is called by usrRoot() to obtain
* pointers when creating the system serial devices, `/tyCo/x'.  It
* is also used by the WDB agent to locate its 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 ||
	channel >= (int) (NELEMENTS(sysSioChans)) )
	return (SIO_CHAN *) ERROR;

    return sysSioChans[channel];
    }

/******************************************************************************
*
* sysSerialReset - reset the sio devices to a quiet state
*
* Reset all devices to prevent them from generating interrupts.
*
* This is called from sysToMonitor() to shutdown the system gracefully
* before transferring control to the boot ROM.
*
* RETURNS: N/A.
*/

void sysSerialReset (void)
    {
    int i;

    for (i = 0; i < N_AT91_USART_CHANNELS; i++)
	{

	/* disable interrupts */

	intDisable (devParas[i].intLevel);
	}

    return;
    }
#endif /* INCLUDE_SERIAL */