st7545.c

用于TM1300/PNX1300系列DSP（主要用于视频处理）的设备库的源码

/*
 * Copyright (c) 1995,1996,1997 by TriMedia Technologies. 
 *
 * +------------------------------------------------------------------+
 * | This software is furnished under a license and may only be used  |
 * | and copied in accordance with the terms and conditions of  such  |
 * | a license and with the inclusion of this copyright notice. This  |
 * | software or any other copies of this software may not be provided|
 * | or otherwise made available to any other person.  The ownership  |
 * | and title of this software is not transferred.                   |
 * |                                                                  |
 * | The information in this software is subject  to change without   |
 * | any  prior notice and should not be construed as a commitment by |
 * | TriMedia Technologies.                                           |
 * |                                                                  |
 * | this code and information is provided "as is" without any        |
 * | warranty of any kind, either expressed or implied, including but |
 * | not limited to the implied warranties of merchantability and/or  |
 * | fitness for any particular purpose.                              |
 * +------------------------------------------------------------------+
 *
 *  Module name              : st7545.c    1.15
 *
 *  Last update              : 11:55:18 - 97/08/09
 *
 *  Description              :
 *
 *      Board Support package for Thompson 7545 AFE on TM IREF board.
 *      Created for TCS 1.1 Release.
 *      Called by tmSSI portion of device library.
 *      This package provides only the most rudimentary support for taking
 *      the 7545 out of reset.
 *      All programming is up to the application
 *
 */

#include <math.h>
#include <tmlib/tmtypes.h>
#include <tm1/tmInterrupts.h>
#include <ops/custom_defs.h>
#include <tm1/tmBoard.h>
#include <tm1/mmio.h>
#include <tm1/tmSSImmio.h>

#include "st7545.h"

#define SSI_CONTROL_PORT_ADDRESS    0x70
#define SSI_CONTROL_PORT_BITMASK    4

/*====================================================================*/
/*          Definitions of static variables:                          */
/*====================================================================*/

/*====================================================================*/
/*      L O C A L   F U N C T I O N   P R O T O T Y P E S           */
/*====================================================================*/

/*  This routine is designed to setup the hardware in device specific way.
 *  Generic stuff is handled in the ssiSetup.
 *  This routine must not leave an interrupt installed.
 */
extern tmLibdevErr_t 
st7545Setup(boardSSIParam_t * param)
{
    UInt        iicd;

    ssiReset();        /* defaults, except: */

    /* toggle AFE reset */
    iicReadReg(SSI_CONTROL_PORT_ADDRESS, -1, &iicd);
    iicd &= ~SSI_CONTROL_PORT_BITMASK;
    iicWriteReg(SSI_CONTROL_PORT_ADDRESS, -1, iicd);
    iicd |= SSI_CONTROL_PORT_BITMASK;
    iicWriteReg(SSI_CONTROL_PORT_ADDRESS, -1, iicd);

    ssiSetModeIO1(SSI_IO1_MODE_GPI);    /* IO1 is input */
    ssiSetWIO2(1);                      /* high for on hook */
    ssiSetModeIO2(SSI_IO2_MODE_GPO);    /* IO2 is output high (on hook) */

#if __LITTLE_ENDIAN__
    ssiLittleEndianEMS();
#else
    ssiBigEndianEMS();
#endif

    return TMLIBDEV_OK;
}


/*****************************************************************
 * st7545Term
 */
extern tmLibdevErr_t 
st7545Term(void)
{
    unsigned int iicd;

    /* ssi to reset */
    ssiReset();
    ssiSetWIO2(1);                      /* IO2 is output high (on hook) */
    ssiSetModeIO2(SSI_IO2_MODE_GPO);
    ssiSetModeIO1(SSI_IO1_MODE_GPI);    /* IO1 is input */

    /* AFE to reset */
    iicReadReg(SSI_CONTROL_PORT_ADDRESS, -1, &iicd);
    iicd &= ~SSI_CONTROL_PORT_BITMASK;
    iicWriteReg(SSI_CONTROL_PORT_ADDRESS, -1, iicd);
    return TMLIBDEV_OK;
}