amd29lv800tmem.c

Vxworks的bsp软件开发包(基于wrPpmc74xx)

/* amd29LV800TMem.c - AMD 29LV800T Flash Memory library */

/* Copyright 1984-2001 Wind River Systems, Inc. */
/*
modification history
--------------------
01c,22jun01,g_h  move sysNvRamGet & sysNvRamSet to sysNvRam.c and make
                 amd29LV800TWrite() , amd29LV800TEraseBlock() & amd29LV800TEraseSector()
				 global.
01b,23may01,pch  Fix initializations of rmasks[] and lmasks[]
01a,22apr01,g_h  written
*/

/*
DESCRIPTION
This library contains routines to manipulate AMD 29LV800T Flash memory.
Read and write routines are included.

The macros NV_RAM_ADRS and NV_RAM_SIZE must be defined to indicate the
address and size of the Flash memory.

This module use the visionWare flash algorithm.

The AMD 29LV800 access is BITS:16 BUS:64 BOOT:TOP ACCESS:DOUBLE.

INCLUDES: amd29LV800TMem.h
*/

/* includes */
#include "amd29LV800TMem.h"
#include "memLib.h"
#include "stdlib.h"

/* locals */
LOCAL void   iOSync(void){ }

LOCAL const tFLASH unlock1 =   {{ 0xAA00AA, 0xAA00AA }};
LOCAL const tFLASH unlock2 =   {{ 0x550055, 0x550055 }};
LOCAL const tFLASH erase1 =    {{ 0x800080, 0x800080 }};
LOCAL const tFLASH erase2 =    {{ 0x300030, 0x300030 }};
LOCAL const tFLASH program =   {{ 0xA000A0, 0xA000A0 }};
LOCAL const tFLASH readArray = {{ 0xF000F0, 0xF000F0 }};
LOCAL const tFLASH erased =    {{ (UINT32)-1, (UINT32)-1 }};

LOCAL const tFLASH rmasks[] = {
	{{0xffffffff, 0xffffffff}},
	{{0xffffffff, 0xffffff00}},
	{{0xffffffff, 0xffff0000}},
	{{0xffffffff, 0xff000000}},
	{{0xffffffff, 0x00000000}},
	{{0xffffff00, 0x00000000}},
	{{0xffff0000, 0x00000000}},
	{{0xff000000, 0x00000000}},
};
LOCAL const tFLASH lmasks[] = {
	{{0xffffffff, 0xffffffff}},
	{{0x00ffffff, 0xffffffff}},
	{{0x0000ffff, 0xffffffff}},
	{{0x000000ff, 0xffffffff}},
	{{0x00000000, 0xffffffff}},
	{{0x00000000, 0x00ffffff}},
	{{0x00000000, 0x0000ffff}},
	{{0x00000000, 0x000000ff}},
};

LOCAL tBLOCK blocks[] = {
	{ 15, 256 },
	{ 1, 128 },
	{ 2, 32 },
	{ 1, 64 }
};

/***************************************************************************
*
* amd29LV800TWrite - write data to the AMD 29LV800T
*
* This routine write given data to the AMD 29LV800T FLASH device.
*
* RETURNS: Number of byte writen
*
* SEE ALSO: amd29LV800TEraseBlock(), amd29LV800TEraseSector() 
*/

UINT32 amd29LV800TWrite
    (
    volatile UINT8 * pDest, 
    UINT8          * pSource,	
    UINT32           length
    )
    {
    unsigned int originalLength = length;
    UINT64 mask;
    tFLASH data;
    unsigned short n;

    volatile UINT8 *pChip = (volatile UINT8 *)((unsigned int)pDest & ~(0x400000 - 1));

    while (length)
        {
	n = ((unsigned int)pDest & (8 - 1));
	mask = lmasks[n].Integer;

	if ((n + length) < 8)
            mask &= rmasks[n + length].Integer;

	data.Integer = readUnaligned(pSource) & mask;
	data.Integer |= *(UINT64 *)pDest & (~mask);
	pSource += 8;

	*(volatile DOUBLE *)(pChip + 0x2AAA8) = unlock1.Float;
	iOSync();
	*(volatile DOUBLE *)(pChip + 0x15550) = unlock2.Float;
	iOSync();
	*(volatile DOUBLE *)(pChip + 0x2AAA8) = program.Float;
	iOSync();
	*(volatile DOUBLE *)pDest = data.Float;

	while (*(volatile UINT64 *)pDest != data.Integer);

	pDest += 8;
	length -= min(8 - n, length);
	}

    *(volatile DOUBLE *)(pDest - 8) = readArray.Float;
    return originalLength - length;
    }

/***************************************************************************
*
* amd29LV800TEraseBlock - erase block in the AMD 29LV800T
*
* This routine erase a block in the AMD 29LV800T FLASH device.
*
* RETURNS: OK
*
* SEE ALSO: amd29LV800TWrite(), amd29LV800TEraseSector() 
*/

UINT32 amd29LV800TEraseBlock
    (
    volatile UINT8 *pChip, 
    volatile UINT8 *pSector
    )
    {
    *(volatile DOUBLE *)(pChip + 0x2AAA8) = unlock1.Float;
    iOSync();
    *(volatile DOUBLE *)(pChip + 0x15550) = unlock2.Float;
    iOSync();
    *(volatile DOUBLE *)(pChip + 0x2AAA8) = erase1.Float;
    iOSync();
    *(volatile DOUBLE *)(pChip + 0x2AAA8) = unlock1.Float;
    iOSync();
    *(volatile DOUBLE *)(pChip + 0x15550) = unlock2.Float;
    iOSync();
    *(volatile DOUBLE *)pSector = erase2.Float;
    iOSync();

    while (*(volatile UINT64 *)pSector != erased.Integer);

    *(volatile DOUBLE *)pSector = readArray.Float;
    
    return (OK);
    }

/***************************************************************************
*
* amd29LV800TEraseSector - erase sector in the AMD 29LV800T
*
* This routine erase sector in the AMD 29LV800T FLASH device.
*
* RETURNS: OK
*
* SEE ALSO: amd29LV800TWrite(), amd29LV800TEraseBlock() 
*/

UINT32 amd29LV800TEraseSector
    (
    volatile UINT8 *pSector
    )
    {
    int i, j;
    volatile UINT8 *pChip = (volatile UINT8 *)((unsigned int)pSector & ~(0x400000 - 1));
    UINT32 n = pSector - pChip;

    for (i = 0; i < BLOCKS; ++i)
	{
	if (n >= (blocks[i].Number * blocks[i].Size * 1024))
	    n -= (blocks[i].Number * blocks[i].Size * 1024);
	else
	    break;
	}

    j = blocks[i].Number;
    n = 0x40000;
    while (n)
	{
	amd29LV800TEraseBlock (pChip, pSector);
 	pSector += blocks[i].Size * 1024;
	n -= blocks[i].Size * 1024;
	if (!--j)
	    {
            j = blocks[++i].Number;
            }
	}

    return (OK);
    }