sweep.c

vt6528芯片交换机API函数和文档运行程序

/*
 * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
 * All rights reserved.
 *
 * This software is copyrighted by and is the sole property of
 * VIA Networking Technologies, Inc. This software may only be used
 * in accordance with the corresponding license agreement. Any unauthorized
 * use, duplication, transmission, distribution, or disclosure of this
 * software is expressly forbidden.
 *
 * This software is provided by VIA Networking Technologies, Inc. "as is"
 * and any express or implied warranties, including, but not limited to, the
 * implied warranties of merchantability and fitness for a particular purpose
 * are disclaimed. In no event shall VIA Networking Technologies, Inc.
 * be liable for any direct, indirect, incidental, special, exemplary, or
 * consequential damages.
 *
 *
 * File:    sweep.c
 *
 * Purpose: EEPROM hardware accessing functions
 *
 * Author:  Tevin Chen
 *
 * Date:    Jan 08, 2002
 *
 * Functions:
 *
 * Revision History:
 *
 */


#if !defined(__PLATFORM_H__)
#include "platform.h"
#endif
#if !defined(__SWITCH_H__)
#include "switch.h"
#endif
#if !defined(__SWREG_H__)
#include "swreg.h"
#endif
#if !defined(__SWEEP_H__)
#include "sweep.h"
#endif




/*---------------------  Static Definitions  ------------------------*/

/*---------------------  Static Types  ------------------------------*/

/*---------------------  Static Macros  -----------------------------*/

/*---------------------  Static Classes  ----------------------------*/

/*---------------------  Static Variables  --------------------------*/

/*---------------------  Static Functions  --------------------------*/

/*---------------------  Export Variables  --------------------------*/

//lucas
/************************************************************************
 * EEPROM Wait Busy
 ************************************************************************/
static void
s_vEepromBusyWait(void)
{
    
    UINT8       u8RegData;
    
    do
    {
        SWREG_vReadU8(INITCTL_EEP_STATUS, &u8RegData);
        
    } while ((u8RegData & EEP_STATUS_BUSY) == EEP_STATUS_BUSY);
    
} /* end s)vEepromBusyWait */

BOOL SWEEP_bReadU8(UINT16 u16Addr, PUINT8 pu8Data)
{
    // protect eeprom data reg from being ruined before using it
    PLAT_vCpuCriticalEnter();

    // Set address
    SWREG_vWriteU8(INITCTL_EEP_ADDR, (UINT8)(u16Addr));
    // Set device id and issue read command
    // (0~255 => dev id = 0; 256~511 => dev id = 1....)
    SWREG_vWriteU8(INITCTL_EEP_CMD, ((u16Addr >> 7) & EEP_CMD_DEV_ID_MSK) | EEP_CMD_RD );
    
    // loop to wait for EEPROM operation complete
#if (0)
    if (!SWREG_bWaitStatus(INITCTL_EEP_STATUS, EEP_STATUS_BUSY, FALSE))
    {
        PLAT_vCpuCriticalExit();
        return FALSE;
    }
#else
    s_vEepromBusyWait();
#endif

    // get data and return true
    SWREG_vReadU8(INITCTL_EEP_RD_DATA, pu8Data);
    PLAT_vCpuCriticalExit();
    return TRUE;
}


BOOL SWEEP_bWriteU8(UINT16 u16Addr, UINT8 u8Data)
{
    // protect eeprom data reg from being ruined before using it
    PLAT_vCpuCriticalEnter();

    // Set address
    SWREG_vWriteU8(INITCTL_EEP_ADDR, (UINT8)(u16Addr));
    // Set written value
    SWREG_vWriteU8(INITCTL_EEP_WR_DATA, u8Data);
    // Set device id and issue write command
    // (0~255 => dev id = 0; 256~511 => dev id = 1....)
    SWREG_vWriteU8(INITCTL_EEP_CMD, ((u16Addr >> 7) & EEP_CMD_DEV_ID_MSK) | EEP_CMD_WR );
   
    // loop to wait for EEPROM operation complete
#if (0)
    if (!SWREG_bWaitStatus(INITCTL_EEP_STATUS, EEP_STATUS_BUSY, FALSE))
    {
        PLAT_vCpuCriticalExit();
        return FALSE;
    }
#else
    s_vEepromBusyWait();
#endif

    PLAT_vCpuCriticalExit();
    return TRUE;
}


BOOL SWEEP_bVerifyCheckSum (UINT16 wStartAddr, UINT16 wBlockSize)
{   
    UINT8    bySromPtr;
    UINT8    byCheckSum = 0;
    UINT16   ii;
    
    for (ii = wStartAddr; ii < wStartAddr+wBlockSize; ii++) {
    	SWEEP_bReadU8(ii, &bySromPtr);
        byCheckSum ^= bySromPtr; 
    }
    	
    if (byCheckSum == 0)
        return TRUE;
    else
        return FALSE;  
}