board/bf533-ezkit/flash.c - github/trini/u-boot - Gitiles

 /*
  * U-boot - flash.c Flash driver for PSD4256GV
  *
  * Copyright (c) 2005-2007 Analog Devices Inc.
  * This file is based on BF533EzFlash.c originally written by Analog Devices, Inc.
  *
  * (C) Copyright 2000-2004
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
  * See file CREDITS for list of people who contributed to this
  * project.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
  * published by the Free Software Foundation; either version 2 of
  * the License, or (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
  * MA 02110-1301 USA
  */

 #include <asm/io.h>
 #include "flash-defines.h"

 int AFP_NumSectors = 40;
 long AFP_SectorSize1 = 0x10000;
 int AFP_SectorSize2 = 0x4000;

 void flash_reset(void)
 {
 	reset_flash();
 }

 unsigned long flash_get_size(ulong baseaddr, flash_info_t * info, int bank_flag)
 {
 	int id = 0, i = 0;
 	static int FlagDev = 1;

 	id = get_codes();
 	if (FlagDev) {
 #ifdef DEBUG
 		printf("Device ID of the Flash is %x\n", id);
 #endif
 		FlagDev = 0;
 	}
 	info->flash_id = id;

 	switch (bank_flag) {
 	case 0:
 		for (i = PriFlashABegin; i < SecFlashABegin; i++)
 			info->start[i] = (baseaddr + (i * AFP_SectorSize1));
 		info->size = 0x200000;
 		info->sector_count = 32;
 		break;
 	case 1:
 		info->start[0] = baseaddr + SecFlashASec1Off;
 		info->start[1] = baseaddr + SecFlashASec2Off;
 		info->start[2] = baseaddr + SecFlashASec3Off;
 		info->start[3] = baseaddr + SecFlashASec4Off;
 		info->size = 0x10000;
 		info->sector_count = 4;
 		break;
 	case 2:
 		info->start[0] = baseaddr + SecFlashBSec1Off;
 		info->start[1] = baseaddr + SecFlashBSec2Off;
 		info->start[2] = baseaddr + SecFlashBSec3Off;
 		info->start[3] = baseaddr + SecFlashBSec4Off;
 		info->size = 0x10000;
 		info->sector_count = 4;
 		break;
 	}
 	return (info->size);
 }

 unsigned long flash_init(void)
 {
 	unsigned long size_b0, size_b1, size_b2;
 	int i;

 	size_b0 = size_b1 = size_b2 = 0;
 #ifdef DEBUG
 	printf("Flash Memory Start 0x%x\n", CONFIG_SYS_FLASH_BASE);
 	printf("Memory Map for the Flash\n");
 	printf("0x20000000 - 0x200FFFFF Flash A Primary (1MB)\n");
 	printf("0x20100000 - 0x201FFFFF Flash B Primary (1MB)\n");
 	printf("0x20200000 - 0x2020FFFF Flash A Secondary (64KB)\n");
 	printf("0x20280000 - 0x2028FFFF Flash B Secondary (64KB)\n");
 	printf("Please type command flinfo for information on Sectors \n");
 #endif
 	for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
 		flash_info[i].flash_id = FLASH_UNKNOWN;
 	}

 	size_b0 = flash_get_size(CONFIG_SYS_FLASH0_BASE, &flash_info[0], 0);
 	size_b1 = flash_get_size(CONFIG_SYS_FLASH0_BASE, &flash_info[1], 1);
 	size_b2 = flash_get_size(CONFIG_SYS_FLASH0_BASE, &flash_info[2], 2);

 	if (flash_info[0].flash_id == FLASH_UNKNOWN || size_b0 == 0) {
 		printf("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
 		       size_b0, size_b0 >> 20);
 	}

 	(void)flash_protect(FLAG_PROTECT_SET, CONFIG_SYS_FLASH0_BASE,
 			    (flash_info[0].start[2] - 1), &flash_info[0]);

 	return (size_b0 + size_b1 + size_b2);
 }

 void flash_print_info(flash_info_t * info)
 {
 	int i;

 	if (info->flash_id == FLASH_UNKNOWN) {
 		printf("missing or unknown FLASH type\n");
 		return;
 	}

 	switch (info->flash_id) {
 	case FLASH_PSD4256GV:
 		printf("ST Microelectronics ");
 		break;
 	default:
 		printf("Unknown Vendor: (0x%08lX) ", info->flash_id);
 		break;
 	}
 	for (i = 0; i < info->sector_count; ++i) {
 		if ((i % 5) == 0)
 			printf("\n   ");
 		printf(" %08lX%s",
 		       info->start[i], info->protect[i] ? " (RO)" : "     ");
 	}
 	printf("\n");
 	return;
 }

 int flash_erase(flash_info_t * info, int s_first, int s_last)
 {
 	int cnt = 0, i;
 	int prot, sect;

 	prot = 0;
 	for (sect = s_first; sect <= s_last; ++sect) {
 		if (info->protect[sect])
 			prot++;
 	}

 	if (prot)
 		printf("- Warning: %d protected sectors will not be erased!\n",
 		       prot);
 	else
 		printf("\n");

 	cnt = s_last - s_first + 1;

 	if (cnt == FLASH_TOT_SECT) {
 		printf("Erasing flash, Please Wait \n");
 		if (erase_flash() < 0) {
 			printf("Erasing flash failed \n");
 			return FLASH_FAIL;
 		}
 	} else {
 		printf("Erasing Flash locations, Please Wait\n");
 		for (i = s_first; i <= s_last; i++) {
 			if (info->protect[i] == 0) {	/* not protected */
 				if (erase_block_flash(i, info->start[i]) < 0) {
 					printf("Error Sector erasing \n");
 					return FLASH_FAIL;
 				}
 			}
 		}
 	}
 	return FLASH_SUCCESS;
 }

 int write_buff(flash_info_t * info, uchar * src, ulong addr, ulong cnt)
 {
 	int ret;
 	int d;
 	if (addr % 2) {
 		read_flash(addr - 1 - CONFIG_SYS_FLASH_BASE, &d);
 		d = (int)((d & 0x00FF) | (*src++ << 8));
 		ret = write_data(addr - 1, 2, (uchar *) & d);
 		if (ret == FLASH_FAIL)
 			return ERR_NOT_ERASED;
 		ret = write_data(addr + 1, cnt - 1, src);
 	} else
 		ret = write_data(addr, cnt, src);
 	if (ret == FLASH_FAIL)
 		return ERR_NOT_ERASED;
 	return FLASH_SUCCESS;
 }

 int write_data(long lStart, long lCount, uchar * pnData)
 {
 	long i = 0;
 	unsigned long ulOffset = lStart - CONFIG_SYS_FLASH_BASE;
 	int d;
 	int nSector = 0;
 	int flag = 0;

 	if (lCount % 2) {
 		flag = 1;
 		lCount = lCount - 1;
 	}

 	for (i = 0; i < lCount - 1; i += 2, ulOffset += 2) {
 		get_sector_number(ulOffset, &nSector);
 		read_flash(ulOffset, &d);
 		if (d != 0xffff) {
 			printf
 			    ("Flash not erased at offset 0x%lx Please erase to reprogram\n",
 			     ulOffset);
 			return FLASH_FAIL;
 		}
 		unlock_flash(ulOffset);
 		d = (int)(pnData[i] | pnData[i + 1] << 8);
 		write_flash(ulOffset, d);
 		if (poll_toggle_bit(ulOffset) < 0) {
 			printf("Error programming the flash \n");
 			return FLASH_FAIL;
 		}
 		if ((i > 0) && (!(i % AFP_SectorSize2)))
 			printf(".");
 	}
 	if (flag) {
 		get_sector_number(ulOffset, &nSector);
 		read_flash(ulOffset, &d);
 		if (d != 0xffff) {
 			printf
 			    ("Flash not erased at offset 0x%lx Please erase to reprogram\n",
 			     ulOffset);
 			return FLASH_FAIL;
 		}
 		unlock_flash(ulOffset);
 		d = (int)(pnData[i] | (d & 0xFF00));
 		write_flash(ulOffset, d);
 		if (poll_toggle_bit(ulOffset) < 0) {
 			printf("Error programming the flash \n");
 			return FLASH_FAIL;
 		}
 	}
 	return FLASH_SUCCESS;
 }

 int read_data(long ulStart, long lCount, long lStride, int *pnData)
 {
 	long i = 0;
 	int j = 0;
 	long ulOffset = ulStart;
 	int iShift = 0;
 	int iNumWords = 2;
 	int nLeftover = lCount % 4;
 	int nHi, nLow;
 	int nSector = 0;

 	for (i = 0; (i < lCount / 4) && (i < BUFFER_SIZE); i++) {
 		for (iShift = 0, j = 0; j < iNumWords; j += 2) {
 			if ((ulOffset >= INVALIDLOCNSTART)
 			    && (ulOffset < INVALIDLOCNEND))
 				return FLASH_FAIL;

 			get_sector_number(ulOffset, &nSector);
 			read_flash(ulOffset, &nLow);
 			ulOffset += (lStride * 2);
 			read_flash(ulOffset, &nHi);
 			ulOffset += (lStride * 2);
 			pnData[i] = (nHi << 16) | nLow;
 		}
 	}
 	if (nLeftover > 0) {
 		if ((ulOffset >= INVALIDLOCNSTART)
 		    && (ulOffset < INVALIDLOCNEND))
 			return FLASH_FAIL;

 		get_sector_number(ulOffset, &nSector);
 		read_flash(ulOffset, &pnData[i]);
 	}
 	return FLASH_SUCCESS;
 }

 int write_flash(long nOffset, int nValue)
 {
 	long addr;

 	addr = (CONFIG_SYS_FLASH_BASE + nOffset);
 	SSYNC();
 	*(unsigned volatile short *)addr = nValue;
 	SSYNC();
 	if (poll_toggle_bit(nOffset) < 0)
 		return FLASH_FAIL;
 	return FLASH_SUCCESS;
 }

 int read_flash(long nOffset, int *pnValue)
 {
 	int nValue = 0x0;
 	long addr = (CONFIG_SYS_FLASH_BASE + nOffset);

 	if (nOffset != 0x2)
 		reset_flash();
 	SSYNC();
 	nValue = *(volatile unsigned short *)addr;
 	SSYNC();
 	*pnValue = nValue;
 	return true;
 }

 int poll_toggle_bit(long lOffset)
 {
 	unsigned int u1, u2;
 	unsigned long timeout = 0xFFFFFFFF;
 	volatile unsigned long *FB =
 	    (volatile unsigned long *)(0x20000000 + lOffset);
 	while (1) {
 		if (timeout < 0)
 			break;
 		u1 = *(volatile unsigned short *)FB;
 		u2 = *(volatile unsigned short *)FB;
 		if ((u1 & 0x0040) == (u2 & 0x0040))
 			return FLASH_SUCCESS;
 		if ((u2 & 0x0020) == 0x0000)
 			continue;
 		u1 = *(volatile unsigned short *)FB;
 		if ((u2 & 0x0040) == (u1 & 0x0040))
 			return FLASH_SUCCESS;
 		else {
 			reset_flash();
 			return FLASH_FAIL;
 		}
 		timeout--;
 	}
 	printf("Time out occured \n");
 	if (timeout < 0)
 		return FLASH_FAIL;
 }

 void reset_flash(void)
 {
 	write_flash(WRITESEQ1, RESET_VAL);
 	/* Wait for 10 micro seconds */
 	udelay(10);
 }

 int erase_flash(void)
 {
 	write_flash(WRITESEQ1, WRITEDATA1);
 	write_flash(WRITESEQ2, WRITEDATA2);
 	write_flash(WRITESEQ3, WRITEDATA3);
 	write_flash(WRITESEQ4, WRITEDATA4);
 	write_flash(WRITESEQ5, WRITEDATA5);
 	write_flash(WRITESEQ6, WRITEDATA6);

 	if (poll_toggle_bit(0x0000) < 0)
 		return FLASH_FAIL;

 	write_flash(SecFlashAOff + WRITESEQ1, WRITEDATA1);
 	write_flash(SecFlashAOff + WRITESEQ2, WRITEDATA2);
 	write_flash(SecFlashAOff + WRITESEQ3, WRITEDATA3);
 	write_flash(SecFlashAOff + WRITESEQ4, WRITEDATA4);
 	write_flash(SecFlashAOff + WRITESEQ5, WRITEDATA5);
 	write_flash(SecFlashAOff + WRITESEQ6, WRITEDATA6);

 	if (poll_toggle_bit(SecFlashASec1Off) < 0)
 		return FLASH_FAIL;

 	write_flash(PriFlashBOff + WRITESEQ1, WRITEDATA1);
 	write_flash(PriFlashBOff + WRITESEQ2, WRITEDATA2);
 	write_flash(PriFlashBOff + WRITESEQ3, WRITEDATA3);
 	write_flash(PriFlashBOff + WRITESEQ4, WRITEDATA4);
 	write_flash(PriFlashBOff + WRITESEQ5, WRITEDATA5);
 	write_flash(PriFlashBOff + WRITESEQ6, WRITEDATA6);

 	if (poll_toggle_bit(PriFlashBOff) < 0)
 		return FLASH_FAIL;

 	write_flash(SecFlashBOff + WRITESEQ1, WRITEDATA1);
 	write_flash(SecFlashBOff + WRITESEQ2, WRITEDATA2);
 	write_flash(SecFlashBOff + WRITESEQ3, WRITEDATA3);
 	write_flash(SecFlashBOff + WRITESEQ4, WRITEDATA4);
 	write_flash(SecFlashBOff + WRITESEQ5, WRITEDATA5);
 	write_flash(SecFlashBOff + WRITESEQ6, WRITEDATA6);

 	if (poll_toggle_bit(SecFlashBOff) < 0)
 		return FLASH_FAIL;

 	return FLASH_SUCCESS;
 }

 int erase_block_flash(int nBlock, unsigned long address)
 {
 	long ulSectorOff = 0x0;

 	if ((nBlock < 0) || (nBlock > AFP_NumSectors))
 		return false;

 	ulSectorOff = (address - CONFIG_SYS_FLASH_BASE);

 	write_flash((WRITESEQ1 | ulSectorOff), WRITEDATA1);
 	write_flash((WRITESEQ2 | ulSectorOff), WRITEDATA2);
 	write_flash((WRITESEQ3 | ulSectorOff), WRITEDATA3);
 	write_flash((WRITESEQ4 | ulSectorOff), WRITEDATA4);
 	write_flash((WRITESEQ5 | ulSectorOff), WRITEDATA5);

 	write_flash(ulSectorOff, BlockEraseVal);

 	if (poll_toggle_bit(ulSectorOff) < 0)
 		return FLASH_FAIL;

 	return FLASH_SUCCESS;
 }

 void unlock_flash(long ulOffset)
 {
 	unsigned long ulOffsetAddr = ulOffset;
 	ulOffsetAddr &= 0xFFFF0000;

 	write_flash((WRITESEQ1 | ulOffsetAddr), UNLOCKDATA1);
 	write_flash((WRITESEQ2 | ulOffsetAddr), UNLOCKDATA2);
 	write_flash((WRITESEQ3 | ulOffsetAddr), UNLOCKDATA3);
 }

 int get_codes()
 {
 	int dev_id = 0;

 	write_flash(WRITESEQ1, GETCODEDATA1);
 	write_flash(WRITESEQ2, GETCODEDATA2);
 	write_flash(WRITESEQ3, GETCODEDATA3);

 	read_flash(0x0002, &dev_id);
 	dev_id &= 0x00FF;

 	reset_flash();

 	return dev_id;
 }

 void get_sector_number(long ulOffset, int *pnSector)
 {
 	int nSector = 0;

 	if (ulOffset >= SecFlashAOff) {
 		if ((ulOffset < SecFlashASec1Off)
 		    && (ulOffset < SecFlashASec2Off)) {
 			nSector = SECT32;
 		} else if ((ulOffset >= SecFlashASec2Off)
 			   && (ulOffset < SecFlashASec3Off)) {
 			nSector = SECT33;
 		} else if ((ulOffset >= SecFlashASec3Off)
 			   && (ulOffset < SecFlashASec4Off)) {
 			nSector = SECT34;
 		} else if ((ulOffset >= SecFlashASec4Off)
 			   && (ulOffset < SecFlashAEndOff)) {
 			nSector = SECT35;
 		}
 	} else if (ulOffset >= SecFlashBOff) {
 		if ((ulOffset < SecFlashBSec1Off)
 		    && (ulOffset < SecFlashBSec2Off)) {
 			nSector = SECT36;
 		}
 		if ((ulOffset < SecFlashBSec2Off)
 		    && (ulOffset < SecFlashBSec3Off)) {
 			nSector = SECT37;
 		}
 		if ((ulOffset < SecFlashBSec3Off)
 		    && (ulOffset < SecFlashBSec4Off)) {
 			nSector = SECT38;
 		}
 		if ((ulOffset < SecFlashBSec4Off)
 		    && (ulOffset < SecFlashBEndOff)) {
 			nSector = SECT39;
 		}
 	} else if ((ulOffset >= PriFlashAOff) && (ulOffset < SecFlashAOff)) {
 		nSector = ulOffset & 0xffff0000;
 		nSector = ulOffset >> 16;
 		nSector = nSector & 0x000ff;
 	}

 	if ((nSector >= 0) && (nSector < AFP_NumSectors)) {
 		*pnSector = nSector;
 	}
 }
	/*
	* U-boot - flash.c Flash driver for PSD4256GV
	*
	* Copyright (c) 2005-2007 Analog Devices Inc.
	* This file is based on BF533EzFlash.c originally written by Analog Devices, Inc.
	*
	* (C) Copyright 2000-2004
	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	*
	* See file CREDITS for list of people who contributed to this
	* project.
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License as
	* published by the Free Software Foundation; either version 2 of
	* the License, or (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
	* MA 02110-1301 USA
	*/

	#include <asm/io.h>
	#include "flash-defines.h"

	int AFP_NumSectors = 40;
	long AFP_SectorSize1 = 0x10000;
	int AFP_SectorSize2 = 0x4000;

	void flash_reset(void)
	{
	reset_flash();
	}

	unsigned long flash_get_size(ulong baseaddr, flash_info_t * info, int bank_flag)
	{
	int id = 0, i = 0;
	static int FlagDev = 1;

	id = get_codes();
	if (FlagDev) {
	#ifdef DEBUG
	printf("Device ID of the Flash is %x\n", id);
	#endif
	FlagDev = 0;
	}
	info->flash_id = id;

	switch (bank_flag) {
	case 0:
	for (i = PriFlashABegin; i < SecFlashABegin; i++)
	info->start[i] = (baseaddr + (i * AFP_SectorSize1));
	info->size = 0x200000;
	info->sector_count = 32;
	break;
	case 1:
	info->start[0] = baseaddr + SecFlashASec1Off;
	info->start[1] = baseaddr + SecFlashASec2Off;
	info->start[2] = baseaddr + SecFlashASec3Off;
	info->start[3] = baseaddr + SecFlashASec4Off;
	info->size = 0x10000;
	info->sector_count = 4;
	break;
	case 2:
	info->start[0] = baseaddr + SecFlashBSec1Off;
	info->start[1] = baseaddr + SecFlashBSec2Off;
	info->start[2] = baseaddr + SecFlashBSec3Off;
	info->start[3] = baseaddr + SecFlashBSec4Off;
	info->size = 0x10000;
	info->sector_count = 4;
	break;
	}
	return (info->size);
	}

	unsigned long flash_init(void)
	{
	unsigned long size_b0, size_b1, size_b2;
	int i;

	size_b0 = size_b1 = size_b2 = 0;
	#ifdef DEBUG
	printf("Flash Memory Start 0x%x\n", CONFIG_SYS_FLASH_BASE);
	printf("Memory Map for the Flash\n");
	printf("0x20000000 - 0x200FFFFF Flash A Primary (1MB)\n");
	printf("0x20100000 - 0x201FFFFF Flash B Primary (1MB)\n");
	printf("0x20200000 - 0x2020FFFF Flash A Secondary (64KB)\n");
	printf("0x20280000 - 0x2028FFFF Flash B Secondary (64KB)\n");
	printf("Please type command flinfo for information on Sectors \n");
	#endif
	for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
	flash_info[i].flash_id = FLASH_UNKNOWN;
	}

	size_b0 = flash_get_size(CONFIG_SYS_FLASH0_BASE, &flash_info[0], 0);
	size_b1 = flash_get_size(CONFIG_SYS_FLASH0_BASE, &flash_info[1], 1);
	size_b2 = flash_get_size(CONFIG_SYS_FLASH0_BASE, &flash_info[2], 2);

	if (flash_info[0].flash_id == FLASH_UNKNOWN \|\| size_b0 == 0) {
	printf("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
	size_b0, size_b0 >> 20);
	}

	(void)flash_protect(FLAG_PROTECT_SET, CONFIG_SYS_FLASH0_BASE,
	(flash_info[0].start[2] - 1), &flash_info[0]);

	return (size_b0 + size_b1 + size_b2);
	}

	void flash_print_info(flash_info_t * info)
	{
	int i;

	if (info->flash_id == FLASH_UNKNOWN) {
	printf("missing or unknown FLASH type\n");
	return;
	}

	switch (info->flash_id) {
	case FLASH_PSD4256GV:
	printf("ST Microelectronics ");
	break;
	default:
	printf("Unknown Vendor: (0x%08lX) ", info->flash_id);
	break;
	}
	for (i = 0; i < info->sector_count; ++i) {
	if ((i % 5) == 0)
	printf("\n ");
	printf(" %08lX%s",
	info->start[i], info->protect[i] ? " (RO)" : " ");
	}
	printf("\n");
	return;
	}

	int flash_erase(flash_info_t * info, int s_first, int s_last)
	{
	int cnt = 0, i;
	int prot, sect;

	prot = 0;
	for (sect = s_first; sect <= s_last; ++sect) {
	if (info->protect[sect])
	prot++;
	}

	if (prot)
	printf("- Warning: %d protected sectors will not be erased!\n",
	prot);
	else
	printf("\n");

	cnt = s_last - s_first + 1;

	if (cnt == FLASH_TOT_SECT) {
	printf("Erasing flash, Please Wait \n");
	if (erase_flash() < 0) {
	printf("Erasing flash failed \n");
	return FLASH_FAIL;
	}
	} else {
	printf("Erasing Flash locations, Please Wait\n");
	for (i = s_first; i <= s_last; i++) {
	if (info->protect[i] == 0) { /* not protected */
	if (erase_block_flash(i, info->start[i]) < 0) {
	printf("Error Sector erasing \n");
	return FLASH_FAIL;
	}
	}
	}
	}
	return FLASH_SUCCESS;
	}

	int write_buff(flash_info_t * info, uchar * src, ulong addr, ulong cnt)
	{
	int ret;
	int d;
	if (addr % 2) {
	read_flash(addr - 1 - CONFIG_SYS_FLASH_BASE, &d);
	d = (int)((d & 0x00FF) \| (*src++ << 8));
	ret = write_data(addr - 1, 2, (uchar *) & d);
	if (ret == FLASH_FAIL)
	return ERR_NOT_ERASED;
	ret = write_data(addr + 1, cnt - 1, src);
	} else
	ret = write_data(addr, cnt, src);
	if (ret == FLASH_FAIL)
	return ERR_NOT_ERASED;
	return FLASH_SUCCESS;
	}

	int write_data(long lStart, long lCount, uchar * pnData)
	{
	long i = 0;
	unsigned long ulOffset = lStart - CONFIG_SYS_FLASH_BASE;
	int d;
	int nSector = 0;
	int flag = 0;

	if (lCount % 2) {
	flag = 1;
	lCount = lCount - 1;
	}

	for (i = 0; i < lCount - 1; i += 2, ulOffset += 2) {
	get_sector_number(ulOffset, &nSector);
	read_flash(ulOffset, &d);
	if (d != 0xffff) {
	printf
	("Flash not erased at offset 0x%lx Please erase to reprogram\n",
	ulOffset);
	return FLASH_FAIL;
	}
	unlock_flash(ulOffset);
	d = (int)(pnData[i] \| pnData[i + 1] << 8);
	write_flash(ulOffset, d);
	if (poll_toggle_bit(ulOffset) < 0) {
	printf("Error programming the flash \n");
	return FLASH_FAIL;
	}
	if ((i > 0) && (!(i % AFP_SectorSize2)))
	printf(".");
	}
	if (flag) {
	get_sector_number(ulOffset, &nSector);
	read_flash(ulOffset, &d);
	if (d != 0xffff) {
	printf
	("Flash not erased at offset 0x%lx Please erase to reprogram\n",
	ulOffset);
	return FLASH_FAIL;
	}
	unlock_flash(ulOffset);
	d = (int)(pnData[i] \| (d & 0xFF00));
	write_flash(ulOffset, d);
	if (poll_toggle_bit(ulOffset) < 0) {
	printf("Error programming the flash \n");
	return FLASH_FAIL;
	}
	}
	return FLASH_SUCCESS;
	}

	int read_data(long ulStart, long lCount, long lStride, int *pnData)
	{
	long i = 0;
	int j = 0;
	long ulOffset = ulStart;
	int iShift = 0;
	int iNumWords = 2;
	int nLeftover = lCount % 4;
	int nHi, nLow;
	int nSector = 0;

	for (i = 0; (i < lCount / 4) && (i < BUFFER_SIZE); i++) {
	for (iShift = 0, j = 0; j < iNumWords; j += 2) {
	if ((ulOffset >= INVALIDLOCNSTART)
	&& (ulOffset < INVALIDLOCNEND))
	return FLASH_FAIL;

	get_sector_number(ulOffset, &nSector);
	read_flash(ulOffset, &nLow);
	ulOffset += (lStride * 2);
	read_flash(ulOffset, &nHi);
	ulOffset += (lStride * 2);
	pnData[i] = (nHi << 16) \| nLow;
	}
	}
	if (nLeftover > 0) {
	if ((ulOffset >= INVALIDLOCNSTART)
	&& (ulOffset < INVALIDLOCNEND))
	return FLASH_FAIL;

	get_sector_number(ulOffset, &nSector);
	read_flash(ulOffset, &pnData[i]);
	}
	return FLASH_SUCCESS;
	}

	int write_flash(long nOffset, int nValue)
	{
	long addr;

	addr = (CONFIG_SYS_FLASH_BASE + nOffset);
	SSYNC();
	(unsigned volatile short )addr = nValue;
	SSYNC();
	if (poll_toggle_bit(nOffset) < 0)
	return FLASH_FAIL;
	return FLASH_SUCCESS;
	}

	int read_flash(long nOffset, int *pnValue)
	{
	int nValue = 0x0;
	long addr = (CONFIG_SYS_FLASH_BASE + nOffset);

	if (nOffset != 0x2)
	reset_flash();
	SSYNC();
	nValue = (volatile unsigned short )addr;
	SSYNC();
	*pnValue = nValue;
	return true;
	}

	int poll_toggle_bit(long lOffset)
	{
	unsigned int u1, u2;
	unsigned long timeout = 0xFFFFFFFF;
	volatile unsigned long *FB =
	(volatile unsigned long *)(0x20000000 + lOffset);
	while (1) {
	if (timeout < 0)
	break;
	u1 = (volatile unsigned short )FB;
	u2 = (volatile unsigned short )FB;
	if ((u1 & 0x0040) == (u2 & 0x0040))
	return FLASH_SUCCESS;
	if ((u2 & 0x0020) == 0x0000)
	continue;
	u1 = (volatile unsigned short )FB;
	if ((u2 & 0x0040) == (u1 & 0x0040))
	return FLASH_SUCCESS;
	else {
	reset_flash();
	return FLASH_FAIL;
	}
	timeout--;
	}
	printf("Time out occured \n");
	if (timeout < 0)
	return FLASH_FAIL;
	}

	void reset_flash(void)
	{
	write_flash(WRITESEQ1, RESET_VAL);
	/* Wait for 10 micro seconds */
	udelay(10);
	}

	int erase_flash(void)
	{
	write_flash(WRITESEQ1, WRITEDATA1);
	write_flash(WRITESEQ2, WRITEDATA2);
	write_flash(WRITESEQ3, WRITEDATA3);
	write_flash(WRITESEQ4, WRITEDATA4);
	write_flash(WRITESEQ5, WRITEDATA5);
	write_flash(WRITESEQ6, WRITEDATA6);

	if (poll_toggle_bit(0x0000) < 0)
	return FLASH_FAIL;

	write_flash(SecFlashAOff + WRITESEQ1, WRITEDATA1);
	write_flash(SecFlashAOff + WRITESEQ2, WRITEDATA2);
	write_flash(SecFlashAOff + WRITESEQ3, WRITEDATA3);
	write_flash(SecFlashAOff + WRITESEQ4, WRITEDATA4);
	write_flash(SecFlashAOff + WRITESEQ5, WRITEDATA5);
	write_flash(SecFlashAOff + WRITESEQ6, WRITEDATA6);

	if (poll_toggle_bit(SecFlashASec1Off) < 0)
	return FLASH_FAIL;

	write_flash(PriFlashBOff + WRITESEQ1, WRITEDATA1);
	write_flash(PriFlashBOff + WRITESEQ2, WRITEDATA2);
	write_flash(PriFlashBOff + WRITESEQ3, WRITEDATA3);
	write_flash(PriFlashBOff + WRITESEQ4, WRITEDATA4);
	write_flash(PriFlashBOff + WRITESEQ5, WRITEDATA5);
	write_flash(PriFlashBOff + WRITESEQ6, WRITEDATA6);

	if (poll_toggle_bit(PriFlashBOff) < 0)
	return FLASH_FAIL;

	write_flash(SecFlashBOff + WRITESEQ1, WRITEDATA1);
	write_flash(SecFlashBOff + WRITESEQ2, WRITEDATA2);
	write_flash(SecFlashBOff + WRITESEQ3, WRITEDATA3);
	write_flash(SecFlashBOff + WRITESEQ4, WRITEDATA4);
	write_flash(SecFlashBOff + WRITESEQ5, WRITEDATA5);
	write_flash(SecFlashBOff + WRITESEQ6, WRITEDATA6);

	if (poll_toggle_bit(SecFlashBOff) < 0)
	return FLASH_FAIL;

	return FLASH_SUCCESS;
	}

	int erase_block_flash(int nBlock, unsigned long address)
	{
	long ulSectorOff = 0x0;

	if ((nBlock < 0) \|\| (nBlock > AFP_NumSectors))
	return false;

	ulSectorOff = (address - CONFIG_SYS_FLASH_BASE);

	write_flash((WRITESEQ1 \| ulSectorOff), WRITEDATA1);
	write_flash((WRITESEQ2 \| ulSectorOff), WRITEDATA2);
	write_flash((WRITESEQ3 \| ulSectorOff), WRITEDATA3);
	write_flash((WRITESEQ4 \| ulSectorOff), WRITEDATA4);
	write_flash((WRITESEQ5 \| ulSectorOff), WRITEDATA5);

	write_flash(ulSectorOff, BlockEraseVal);

	if (poll_toggle_bit(ulSectorOff) < 0)
	return FLASH_FAIL;

	return FLASH_SUCCESS;
	}

	void unlock_flash(long ulOffset)
	{
	unsigned long ulOffsetAddr = ulOffset;
	ulOffsetAddr &= 0xFFFF0000;

	write_flash((WRITESEQ1 \| ulOffsetAddr), UNLOCKDATA1);
	write_flash((WRITESEQ2 \| ulOffsetAddr), UNLOCKDATA2);
	write_flash((WRITESEQ3 \| ulOffsetAddr), UNLOCKDATA3);
	}

	int get_codes()
	{
	int dev_id = 0;

	write_flash(WRITESEQ1, GETCODEDATA1);
	write_flash(WRITESEQ2, GETCODEDATA2);
	write_flash(WRITESEQ3, GETCODEDATA3);

	read_flash(0x0002, &dev_id);
	dev_id &= 0x00FF;

	reset_flash();

	return dev_id;
	}

	void get_sector_number(long ulOffset, int *pnSector)
	{
	int nSector = 0;

	if (ulOffset >= SecFlashAOff) {
	if ((ulOffset < SecFlashASec1Off)
	&& (ulOffset < SecFlashASec2Off)) {
	nSector = SECT32;
	} else if ((ulOffset >= SecFlashASec2Off)
	&& (ulOffset < SecFlashASec3Off)) {
	nSector = SECT33;
	} else if ((ulOffset >= SecFlashASec3Off)
	&& (ulOffset < SecFlashASec4Off)) {
	nSector = SECT34;
	} else if ((ulOffset >= SecFlashASec4Off)
	&& (ulOffset < SecFlashAEndOff)) {
	nSector = SECT35;
	}
	} else if (ulOffset >= SecFlashBOff) {
	if ((ulOffset < SecFlashBSec1Off)
	&& (ulOffset < SecFlashBSec2Off)) {
	nSector = SECT36;
	}
	if ((ulOffset < SecFlashBSec2Off)
	&& (ulOffset < SecFlashBSec3Off)) {
	nSector = SECT37;
	}
	if ((ulOffset < SecFlashBSec3Off)
	&& (ulOffset < SecFlashBSec4Off)) {
	nSector = SECT38;
	}
	if ((ulOffset < SecFlashBSec4Off)
	&& (ulOffset < SecFlashBEndOff)) {
	nSector = SECT39;
	}
	} else if ((ulOffset >= PriFlashAOff) && (ulOffset < SecFlashAOff)) {
	nSector = ulOffset & 0xffff0000;
	nSector = ulOffset >> 16;
	nSector = nSector & 0x000ff;
	}

	if ((nSector >= 0) && (nSector < AFP_NumSectors)) {
	*pnSector = nSector;
	}
	}