swsram.c

VIA VT6524 8口网管交换机源码

/*
 * 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:    swsram.c
 *
 * Purpose: ASIC embedded SRAM hardware accessing functions
 *
 * Author:  Tevin Chen
 *
 * Date:    Jan 08, 2002
 *
 * Functions:
 *
 * Revision History:
 *
 */


#if !defined(__SWITCH_H__)
#include "switch.h"
#endif
#if !defined(__SWREG_H__)
#include "swreg.h"
#endif
#if !defined(__SWSRAM_H__)
#include "swsram.h"
#endif




/*---------------------  Static Definitions  ------------------------*/
#define PTN_SRAM_STS_DONE       0x01
#define PTN_SRAM_STS_BUSY       0x02
#define PTN_SRAM_CMD_READ       0x01
#define PTN_SRAM_CMD_WRITE      0x02

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

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

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

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

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

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




BOOL SWSRAM_bReadSlot (UINT16 wAddr, PBYTE abyData) DIRECT_FUNTYPE_REENT
{
    BYTE   uu;


    // Set sram address
    SWREG_vWriteW(CPU_SRAM_ADDR, wAddr);

    // Wait for sram idle and issue read command
    if (!SWREG_bWaitStatus(CPU_SRAM_STATUS, PTN_SRAM_STS_BUSY, FALSE))
        return FALSE;

    // Trigger read
    SWREG_vWriteB(CPU_SRAM_CMD, PTN_SRAM_CMD_READ);

    // Wait for sram reading done
    if (!SWREG_bWaitStatus(CPU_SRAM_STATUS, PTN_SRAM_STS_DONE, TRUE))
        return FALSE;

    //
    // Read sram data
    //
    // If packet memory
    if (wAddr < SRAM_CTRL_BLK_BASE_ADDR) {
        for (uu = 0; uu < SRAM_PKT_SLOT_SIZE; uu++)
            SWREG_vReadB((UINT16)(CPU_SRAM_DATA + uu), abyData + uu);
    }
    // If control memory
    else {
        for (uu = 0; uu < SRAM_CTRL_SLOT_SIZE; uu++)
            SWREG_vReadB((UINT16)(CPU_SRAM_DATA + uu), abyData + uu);
    }
    return TRUE;
}


BOOL SWSRAM_bWriteSlot (UINT16 wAddr, PBYTE abyData) DIRECT_FUNTYPE_REENT
{
    BYTE   uu;


    // Set sram address
    SWREG_vWriteW(CPU_SRAM_ADDR, wAddr);

    //
    // Write sram data
    //
    // If packet memory
    if (wAddr < SRAM_CTRL_BLK_BASE_ADDR) {
        for (uu = 0; uu < SRAM_PKT_SLOT_SIZE; uu++)
            SWREG_vWriteB((UINT16)(CPU_SRAM_DATA + uu), abyData[uu]);
    }
    // If control memory
    else {
        for (uu = 0; uu < SRAM_CTRL_SLOT_SIZE; uu++)
            SWREG_vWriteB((UINT16)(CPU_SRAM_DATA + uu), abyData[uu]);
    }

    // Wait for sram idle and issue write command
    if (!SWREG_bWaitStatus(CPU_SRAM_STATUS, PTN_SRAM_STS_BUSY, FALSE))
        return FALSE;

    // Trigger write operation
    SWREG_vWriteB(CPU_SRAM_CMD, PTN_SRAM_CMD_WRITE);

    // Wait for sram writing done
    if (!SWREG_bWaitStatus(CPU_SRAM_STATUS, PTN_SRAM_STS_DONE, TRUE))
        return FALSE;

    return TRUE;
}


//
// This function is only suitable for clearing
// VLAN table entry and IP Multicast table entry
//
BOOL SWSRAM_bSetEntryInvalid (UINT16 wAddr) DIRECT_FUNTYPE_REENT
{
    // Set sram address
    SWREG_vWriteW(CPU_SRAM_ADDR, wAddr);

    // Write sram data, because we want to clear bit-127, thus we only clear highest byte
    SWREG_vWriteB(CPU_SRAM_DATA + 7, 0);

    // Wait for sram idle and issue write command
    if (!SWREG_bWaitStatus(CPU_SRAM_STATUS, PTN_SRAM_STS_BUSY, FALSE))
        return FALSE;

    // Trigger write operation
    SWREG_vWriteB(CPU_SRAM_CMD, PTN_SRAM_CMD_WRITE);

    // Wait for sram writing done
    if (!SWREG_bWaitStatus(CPU_SRAM_STATUS, PTN_SRAM_STS_DONE, TRUE))
        return FALSE;

    return TRUE;
}