board/emk/common/flash.c - filogic/uboot - Gitiles

 /*
  * (C) Copyright 2003
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
  * (C) Copyright 2003
  * Reinhard Meyer, EMK Elektronik GmbH, r.meyer@emk-elektronik.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., 59 Temple Place, Suite 330, Boston,
  * MA 02111-1307 USA
  */

 #include <common.h>

 flash_info_t	flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips */

 #if defined (CONFIG_TOP860)
   typedef unsigned short FLASH_PORT_WIDTH;
   typedef volatile unsigned short FLASH_PORT_WIDTHV;
   #define	FLASH_ID_MASK	0xFF

   #define FPW	FLASH_PORT_WIDTH
   #define FPWV	FLASH_PORT_WIDTHV

   #define FLASH_CYCLE1	0x0555
   #define FLASH_CYCLE2	0x02aa
   #define FLASH_ID1		0
   #define FLASH_ID2		1
   #define FLASH_ID3		0x0e
   #define FLASH_ID4		0x0F
 #endif

 #if defined (CONFIG_TOP5200) && !defined (CONFIG_LITE5200)
   typedef unsigned char FLASH_PORT_WIDTH;
   typedef volatile unsigned char FLASH_PORT_WIDTHV;
   #define	FLASH_ID_MASK	0xFF

   #define FPW	FLASH_PORT_WIDTH
   #define FPWV	FLASH_PORT_WIDTHV

   #define FLASH_CYCLE1	0x0aaa
   #define FLASH_CYCLE2	0x0555
   #define FLASH_ID1		0
   #define FLASH_ID2		2
   #define FLASH_ID3		0x1c
   #define FLASH_ID4		0x1E
 #endif

 #if defined (CONFIG_TOP5200) && defined (CONFIG_LITE5200)
   typedef unsigned char FLASH_PORT_WIDTH;
   typedef volatile unsigned char FLASH_PORT_WIDTHV;
   #define	FLASH_ID_MASK	0xFF

   #define FPW	FLASH_PORT_WIDTH
   #define FPWV	FLASH_PORT_WIDTHV

   #define FLASH_CYCLE1	0x0555
   #define FLASH_CYCLE2	0x02aa
   #define FLASH_ID1		0
   #define FLASH_ID2		1
   #define FLASH_ID3		0x0E
   #define FLASH_ID4		0x0F
 #endif

 /*-----------------------------------------------------------------------
  * Functions
  */
 static ulong flash_get_size(FPWV *addr, flash_info_t *info);
 static void flash_reset(flash_info_t *info);
 static int write_word_amd(flash_info_t *info, FPWV *dest, FPW data);
 static flash_info_t *flash_get_info(ulong base);

 /*-----------------------------------------------------------------------
  * flash_init()
  *
  * sets up flash_info and returns size of FLASH (bytes)
  */
 unsigned long flash_init (void)
 {
 	unsigned long size = 0;
 	int i = 0;
 	extern void flash_preinit(void);
 	extern void flash_afterinit(uint, ulong, ulong);
 	ulong flashbase = CFG_FLASH_BASE;

 	flash_preinit();

 	/* There is only ONE FLASH device */
 	memset(&flash_info[i], 0, sizeof(flash_info_t));
 	flash_info[i].size =
 			flash_get_size((FPW *)flashbase, &flash_info[i]);
 	size += flash_info[i].size;

 #if CFG_MONITOR_BASE >= CFG_FLASH_BASE
 	/* monitor protection ON by default */
 	flash_protect(FLAG_PROTECT_SET,
 		      CFG_MONITOR_BASE,
 		      CFG_MONITOR_BASE+monitor_flash_len-1,
 		      flash_get_info(CFG_MONITOR_BASE));
 #endif

 #ifdef	CONFIG_ENV_IS_IN_FLASH
 	/* ENV protection ON by default */
 	flash_protect(FLAG_PROTECT_SET,
 		      CONFIG_ENV_ADDR,
 		      CONFIG_ENV_ADDR+CONFIG_ENV_SIZE-1,
 		      flash_get_info(CONFIG_ENV_ADDR));
 #endif


 	flash_afterinit(i, flash_info[i].start[0], flash_info[i].size);
 	return size ? size : 1;
 }

 /*-----------------------------------------------------------------------
  */
 static void flash_reset(flash_info_t *info)
 {
 	FPWV *base = (FPWV *)(info->start[0]);

 	/* Put FLASH back in read mode */
 	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL)
 		*base = (FPW)0x00FF00FF;	/* Intel Read Mode */
 	else if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_AMD)
 		*base = (FPW)0x00F000F0;	/* AMD Read Mode */
 }

 /*-----------------------------------------------------------------------
  */

 static flash_info_t *flash_get_info(ulong base)
 {
 	int i;
 	flash_info_t * info;

 	for (i = 0; i < CFG_MAX_FLASH_BANKS; i ++) {
 		info = & flash_info[i];
 		if (info->size &&
 			info->start[0] <= base && base <= info->start[0] + info->size - 1)
 			break;
 	}

 	return i == CFG_MAX_FLASH_BANKS ? 0 : info;
 }

 /*-----------------------------------------------------------------------
  */

 void flash_print_info (flash_info_t *info)
 {
 	int i;
 	uchar *boottype;
 	uchar *bootletter;
 	char *fmt;
 	uchar botbootletter[] = "B";
 	uchar topbootletter[] = "T";
 	uchar botboottype[] = "bottom boot sector";
 	uchar topboottype[] = "top boot sector";

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

 	switch (info->flash_id & FLASH_VENDMASK) {
 	case FLASH_MAN_AMD:	printf ("AMD ");		break;
 #if 0
 	case FLASH_MAN_BM:	printf ("BRIGHT MICRO ");	break;
 	case FLASH_MAN_FUJ:	printf ("FUJITSU ");		break;
 	case FLASH_MAN_SST:	printf ("SST ");		break;
 	case FLASH_MAN_STM:	printf ("STM ");		break;
 	case FLASH_MAN_INTEL:	printf ("INTEL ");		break;
 #endif
 	default:		printf ("Unknown Vendor ");	break;
 	}

 	/* check for top or bottom boot, if it applies */
 	if (info->flash_id & FLASH_BTYPE) {
 		boottype = botboottype;
 		bootletter = botbootletter;
 	}
 	else {
 		boottype = topboottype;
 		bootletter = topbootletter;
 	}

 	switch (info->flash_id & FLASH_TYPEMASK) {
 	case FLASH_AM160T:
 	case FLASH_AM160B:
 		fmt = "29LV160%s (16 Mbit, %s)\n";
 		break;
 	case FLASH_AMLV640U:
 		fmt = "29LV640M (64 Mbit)\n";
 		break;
 	case FLASH_AMDLV065D:
 		fmt = "29LV065D (64 Mbit)\n";
 		break;
 	case FLASH_AMLV256U:
 		fmt = "29LV256M (256 Mbit)\n";
 		break;
 	default:
 		fmt = "Unknown Chip Type\n";
 		break;
 	}

 	printf (fmt, bootletter, boottype);

 	printf ("  Size: %ld MB in %d Sectors\n",
 		info->size >> 20,
 		info->sector_count);

 	printf ("  Sector Start Addresses:");

 	for (i=0; i<info->sector_count; ++i) {
 		ulong	size;
 		int		erased;
 		ulong	*flash = (unsigned long *) info->start[i];

 		if ((i % 5) == 0) {
 			printf ("\n   ");
 		}

 		/*
 		 * Check if whole sector is erased
 		 */
 		size =
 			(i != (info->sector_count - 1)) ?
 			(info->start[i + 1] - info->start[i]) >> 2 :
 		(info->start[0] + info->size - info->start[i]) >> 2;

 		for (
 			flash = (unsigned long *) info->start[i], erased = 1;
 				(flash != (unsigned long *) info->start[i] + size) && erased;
 					flash++
 			)
 			erased = *flash == ~0x0UL;

 		printf (" %08lX %s %s",
 			info->start[i],
 			erased ? "E": " ",
 			info->protect[i] ? "(RO)" : "    ");
 	}

 	printf ("\n");
 }

 /*-----------------------------------------------------------------------
  */

 /*
  * The following code cannot be run from FLASH!
  */

 ulong flash_get_size (FPWV *addr, flash_info_t *info)
 {
 	int		i;

 	/* Write auto select command: read Manufacturer ID */
 	/* Write auto select command sequence and test FLASH answer */
 	addr[FLASH_CYCLE1] = (FPW)0x00AA00AA;	/* for AMD, Intel ignores this */
 	addr[FLASH_CYCLE2] = (FPW)0x00550055;	/* for AMD, Intel ignores this */
 	addr[FLASH_CYCLE1] = (FPW)0x00900090;	/* selects Intel or AMD */

 	/* The manufacturer codes are only 1 byte, so just use 1 byte.
 	 * This works for any bus width and any FLASH device width.
 	 */
 	udelay(100);
 	switch (addr[FLASH_ID1] & 0xff) {

 	case (uchar)AMD_MANUFACT:
 		info->flash_id = FLASH_MAN_AMD;
 		break;

 #if 0
 	case (uchar)INTEL_MANUFACT:
 		info->flash_id = FLASH_MAN_INTEL;
 		break;
 #endif

 	default:
 		printf ("unknown vendor=%x ", addr[FLASH_ID1] & 0xff);
 		info->flash_id = FLASH_UNKNOWN;
 		info->sector_count = 0;
 		info->size = 0;
 		break;
 	}

 	/* Check 16 bits or 32 bits of ID so work on 32 or 16 bit bus. */
 	if (info->flash_id != FLASH_UNKNOWN) switch ((FPW)addr[FLASH_ID2]) {

 	case (FPW)AMD_ID_LV160B:
 		info->flash_id += FLASH_AM160B;
 		info->sector_count = 35;
 		info->size = 0x00200000;
 		info->start[0] = (ulong)addr;
 		info->start[1] = (ulong)addr + 0x4000;
 		info->start[2] = (ulong)addr + 0x6000;
 		info->start[3] = (ulong)addr + 0x8000;
 		for (i = 4; i < info->sector_count; i++)
 		{
 			info->start[i] = (ulong)addr + 0x10000 * (i-3);
 		}
 		break;

 	case (FPW)AMD_ID_LV065D:
 		info->flash_id += FLASH_AMDLV065D;
 		info->sector_count = 128;
 		info->size = 0x00800000;
 		for (i = 0; i < info->sector_count; i++)
 		{
 			info->start[i] = (ulong)addr + 0x10000 * i;
 		}
 		break;

 	case (FPW)AMD_ID_MIRROR:
 		/* MIRROR BIT FLASH, read more ID bytes */
 		if ((FPW)addr[FLASH_ID3] == (FPW)AMD_ID_LV640U_2 &&
 			(FPW)addr[FLASH_ID4] == (FPW)AMD_ID_LV640U_3)
 		{
 			info->flash_id += FLASH_AMLV640U;
 			info->sector_count = 128;
 			info->size = 0x00800000;
 			for (i = 0; i < info->sector_count; i++)
 			{
 				info->start[i] = (ulong)addr + 0x10000 * i;
 			}
 			break;
 		}
 		if ((FPW)addr[FLASH_ID3] == (FPW)AMD_ID_LV256U_2 &&
 			(FPW)addr[FLASH_ID4] == (FPW)AMD_ID_LV256U_3)
 		{
 			/* attention: only the first 16 MB will be used in u-boot */
 			info->flash_id += FLASH_AMLV256U;
 			info->sector_count = 256;
 			info->size = 0x01000000;
 			for (i = 0; i < info->sector_count; i++)
 			{
 				info->start[i] = (ulong)addr + 0x10000 * i;
 			}
 			break;
 		}

 		/* fall thru to here ! */
 	default:
 		printf ("unknown AMD device=%x %x %x",
 			(FPW)addr[FLASH_ID2],
 			(FPW)addr[FLASH_ID3],
 			(FPW)addr[FLASH_ID4]);
 		info->flash_id = FLASH_UNKNOWN;
 		info->sector_count = 0;
 		info->size = 0x800000;
 		break;
 	}

 	/* Put FLASH back in read mode */
 	flash_reset(info);

 	return (info->size);
 }

 /*-----------------------------------------------------------------------
  */

 int	flash_erase (flash_info_t *info, int s_first, int s_last)
 {
 	FPWV *addr;
 	int flag, prot, sect;
 	int intel = (info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL;
 	ulong start, now, last;
 	int rcode = 0;

 	if ((s_first < 0) || (s_first > s_last)) {
 		if (info->flash_id == FLASH_UNKNOWN) {
 			printf ("- missing\n");
 		} else {
 			printf ("- no sectors to erase\n");
 		}
 		return 1;
 	}

 	switch (info->flash_id & FLASH_TYPEMASK) {
 	case FLASH_AM160B:
 	case FLASH_AMLV640U:
 		break;
 	case FLASH_UNKNOWN:
 	default:
 		printf ("Can't erase unknown flash type %08lx - aborted\n",
 			info->flash_id);
 		return 1;
 	}

 	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");
 	}

 	last  = get_timer(0);

 	/* Start erase on unprotected sectors */
 	for (sect = s_first; sect<=s_last && rcode == 0; sect++) {

 		if (info->protect[sect] != 0)	/* protected, skip it */
 			continue;

 		/* Disable interrupts which might cause a timeout here */
 		flag = disable_interrupts();

 		addr = (FPWV *)(info->start[sect]);
 		if (intel) {
 			*addr = (FPW)0x00500050; /* clear status register */
 			*addr = (FPW)0x00200020; /* erase setup */
 			*addr = (FPW)0x00D000D0; /* erase confirm */
 		}
 		else {
 			/* must be AMD style if not Intel */
 			FPWV *base;		/* first address in bank */

 			base = (FPWV *)(info->start[0]);
 			base[FLASH_CYCLE1] = (FPW)0x00AA00AA;	/* unlock */
 			base[FLASH_CYCLE2] = (FPW)0x00550055;	/* unlock */
 			base[FLASH_CYCLE1] = (FPW)0x00800080;	/* erase mode */
 			base[FLASH_CYCLE1] = (FPW)0x00AA00AA;	/* unlock */
 			base[FLASH_CYCLE2] = (FPW)0x00550055;	/* unlock */
 			*addr = (FPW)0x00300030;	/* erase sector */
 		}

 		/* re-enable interrupts if necessary */
 		if (flag)
 			enable_interrupts();

 		start = get_timer(0);

 		/* wait at least 50us for AMD, 80us for Intel.
 		 * Let's wait 1 ms.
 		 */
 		udelay (1000);

 		while ((*addr & (FPW)0x00800080) != (FPW)0x00800080) {
 			if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
 				printf ("Timeout\n");

 				if (intel) {
 					/* suspend erase	*/
 					*addr = (FPW)0x00B000B0;
 				}

 				flash_reset(info);	/* reset to read mode */
 				rcode = 1;		/* failed */
 				break;
 			}

 			/* show that we're waiting */
 			if ((get_timer(last)) > CFG_HZ) {/* every second */
 				putc ('.');
 				last = get_timer(0);
 			}
 		}

 		/* show that we're waiting */
 		if ((get_timer(last)) > CFG_HZ) {	/* every second */
 			putc ('.');
 			last = get_timer(0);
 		}

 		flash_reset(info);	/* reset to read mode */
 	}

 	printf (" done\n");
 	return rcode;
 }

 /*-----------------------------------------------------------------------
  * Copy memory to flash, returns:
  * 0 - OK
  * 1 - write timeout
  * 2 - Flash not erased
  */
 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 {
 	FPW data = 0; /* 16 or 32 bit word, matches flash bus width on MPC8XX */
 	int bytes;	  /* number of bytes to program in current word		*/
 	int left;	  /* number of bytes left to program			*/
 	int i, res;

 	for (left = cnt, res = 0;
 		 left > 0 && res == 0;
 		 addr += sizeof(data), left -= sizeof(data) - bytes) {

 		bytes = addr & (sizeof(data) - 1);
 		addr &= ~(sizeof(data) - 1);

 		/* combine source and destination data so can program
 		 * an entire word of 16 or 32 bits
 		 */
 		for (i = 0; i < sizeof(data); i++) {
 			data <<= 8;
 			if (i < bytes || i - bytes >= left )
 				data += *((uchar *)addr + i);
 			else
 				data += *src++;
 		}

 		/* write one word to the flash */
 		switch (info->flash_id & FLASH_VENDMASK) {
 		case FLASH_MAN_AMD:
 			res = write_word_amd(info, (FPWV *)addr, data);
 			break;
 		default:
 			/* unknown flash type, error! */
 			printf ("missing or unknown FLASH type\n");
 			res = 1;	/* not really a timeout, but gives error */
 			break;
 		}
 	}

 	return (res);
 }

 /*-----------------------------------------------------------------------
  * Write a word to Flash for AMD FLASH
  * A word is 16 or 32 bits, whichever the bus width of the flash bank
  * (not an individual chip) is.
  *
  * returns:
  * 0 - OK
  * 1 - write timeout
  * 2 - Flash not erased
  */
 static int write_word_amd (flash_info_t *info, FPWV *dest, FPW data)
 {
 	ulong start;
 	int flag;
 	int res = 0;	/* result, assume success	*/
 	FPWV *base;		/* first address in flash bank	*/

 	/* Check if Flash is (sufficiently) erased */
 	if ((*dest & data) != data) {
 		return (2);
 	}


 	base = (FPWV *)(info->start[0]);

 	/* Disable interrupts which might cause a timeout here */
 	flag = disable_interrupts();

 	base[FLASH_CYCLE1] = (FPW)0x00AA00AA;	/* unlock */
 	base[FLASH_CYCLE2] = (FPW)0x00550055;	/* unlock */
 	base[FLASH_CYCLE1] = (FPW)0x00A000A0;	/* selects program mode */

 	*dest = data;		/* start programming the data	*/

 	/* re-enable interrupts if necessary */
 	if (flag)
 		enable_interrupts();

 	start = get_timer (0);

 	/* data polling for D7 */
 	while (res == 0 && (*dest & (FPW)0x00800080) != (data & (FPW)0x00800080)) {
 		if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
 			*dest = (FPW)0x00F000F0;	/* reset bank */
 			res = 1;
 		}
 	}

 	return (res);
 }
	/*
	* (C) Copyright 2003
	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	*
	* (C) Copyright 2003
	* Reinhard Meyer, EMK Elektronik GmbH, r.meyer@emk-elektronik.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., 59 Temple Place, Suite 330, Boston,
	* MA 02111-1307 USA
	*/

	#include <common.h>

	flash_info_t flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips */

	#if defined (CONFIG_TOP860)
	typedef unsigned short FLASH_PORT_WIDTH;
	typedef volatile unsigned short FLASH_PORT_WIDTHV;
	#define FLASH_ID_MASK 0xFF

	#define FPW FLASH_PORT_WIDTH
	#define FPWV FLASH_PORT_WIDTHV

	#define FLASH_CYCLE1 0x0555
	#define FLASH_CYCLE2 0x02aa
	#define FLASH_ID1 0
	#define FLASH_ID2 1
	#define FLASH_ID3 0x0e
	#define FLASH_ID4 0x0F
	#endif

	#if defined (CONFIG_TOP5200) && !defined (CONFIG_LITE5200)
	typedef unsigned char FLASH_PORT_WIDTH;
	typedef volatile unsigned char FLASH_PORT_WIDTHV;
	#define FLASH_ID_MASK 0xFF

	#define FPW FLASH_PORT_WIDTH
	#define FPWV FLASH_PORT_WIDTHV

	#define FLASH_CYCLE1 0x0aaa
	#define FLASH_CYCLE2 0x0555
	#define FLASH_ID1 0
	#define FLASH_ID2 2
	#define FLASH_ID3 0x1c
	#define FLASH_ID4 0x1E
	#endif

	#if defined (CONFIG_TOP5200) && defined (CONFIG_LITE5200)
	typedef unsigned char FLASH_PORT_WIDTH;
	typedef volatile unsigned char FLASH_PORT_WIDTHV;
	#define FLASH_ID_MASK 0xFF

	#define FPW FLASH_PORT_WIDTH
	#define FPWV FLASH_PORT_WIDTHV

	#define FLASH_CYCLE1 0x0555
	#define FLASH_CYCLE2 0x02aa
	#define FLASH_ID1 0
	#define FLASH_ID2 1
	#define FLASH_ID3 0x0E
	#define FLASH_ID4 0x0F
	#endif

	/*-----------------------------------------------------------------------
	* Functions
	*/
	static ulong flash_get_size(FPWV addr, flash_info_t info);
	static void flash_reset(flash_info_t *info);
	static int write_word_amd(flash_info_t info, FPWV dest, FPW data);
	static flash_info_t *flash_get_info(ulong base);

	/*-----------------------------------------------------------------------
	* flash_init()
	*
	* sets up flash_info and returns size of FLASH (bytes)
	*/
	unsigned long flash_init (void)
	{
	unsigned long size = 0;
	int i = 0;
	extern void flash_preinit(void);
	extern void flash_afterinit(uint, ulong, ulong);
	ulong flashbase = CFG_FLASH_BASE;

	flash_preinit();

	/* There is only ONE FLASH device */
	memset(&flash_info[i], 0, sizeof(flash_info_t));
	flash_info[i].size =
	flash_get_size((FPW *)flashbase, &flash_info[i]);
	size += flash_info[i].size;

	#if CFG_MONITOR_BASE >= CFG_FLASH_BASE
	/* monitor protection ON by default */
	flash_protect(FLAG_PROTECT_SET,
	CFG_MONITOR_BASE,
	CFG_MONITOR_BASE+monitor_flash_len-1,
	flash_get_info(CFG_MONITOR_BASE));
	#endif

	#ifdef CONFIG_ENV_IS_IN_FLASH
	/* ENV protection ON by default */
	flash_protect(FLAG_PROTECT_SET,
	CONFIG_ENV_ADDR,
	CONFIG_ENV_ADDR+CONFIG_ENV_SIZE-1,
	flash_get_info(CONFIG_ENV_ADDR));
	#endif


	flash_afterinit(i, flash_info[i].start[0], flash_info[i].size);
	return size ? size : 1;
	}

	/*-----------------------------------------------------------------------
	*/
	static void flash_reset(flash_info_t *info)
	{
	FPWV base = (FPWV )(info->start[0]);

	/* Put FLASH back in read mode */
	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL)
	base = (FPW)0x00FF00FF; / Intel Read Mode */
	else if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_AMD)
	base = (FPW)0x00F000F0; / AMD Read Mode */
	}

	/*-----------------------------------------------------------------------
	*/

	static flash_info_t *flash_get_info(ulong base)
	{
	int i;
	flash_info_t * info;

	for (i = 0; i < CFG_MAX_FLASH_BANKS; i ++) {
	info = & flash_info[i];
	if (info->size &&
	info->start[0] <= base && base <= info->start[0] + info->size - 1)
	break;
	}

	return i == CFG_MAX_FLASH_BANKS ? 0 : info;
	}

	/*-----------------------------------------------------------------------
	*/

	void flash_print_info (flash_info_t *info)
	{
	int i;
	uchar *boottype;
	uchar *bootletter;
	char *fmt;
	uchar botbootletter[] = "B";
	uchar topbootletter[] = "T";
	uchar botboottype[] = "bottom boot sector";
	uchar topboottype[] = "top boot sector";

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

	switch (info->flash_id & FLASH_VENDMASK) {
	case FLASH_MAN_AMD: printf ("AMD "); break;
	#if 0
	case FLASH_MAN_BM: printf ("BRIGHT MICRO "); break;
	case FLASH_MAN_FUJ: printf ("FUJITSU "); break;
	case FLASH_MAN_SST: printf ("SST "); break;
	case FLASH_MAN_STM: printf ("STM "); break;
	case FLASH_MAN_INTEL: printf ("INTEL "); break;
	#endif
	default: printf ("Unknown Vendor "); break;
	}

	/* check for top or bottom boot, if it applies */
	if (info->flash_id & FLASH_BTYPE) {
	boottype = botboottype;
	bootletter = botbootletter;
	}
	else {
	boottype = topboottype;
	bootletter = topbootletter;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_AM160T:
	case FLASH_AM160B:
	fmt = "29LV160%s (16 Mbit, %s)\n";
	break;
	case FLASH_AMLV640U:
	fmt = "29LV640M (64 Mbit)\n";
	break;
	case FLASH_AMDLV065D:
	fmt = "29LV065D (64 Mbit)\n";
	break;
	case FLASH_AMLV256U:
	fmt = "29LV256M (256 Mbit)\n";
	break;
	default:
	fmt = "Unknown Chip Type\n";
	break;
	}

	printf (fmt, bootletter, boottype);

	printf (" Size: %ld MB in %d Sectors\n",
	info->size >> 20,
	info->sector_count);

	printf (" Sector Start Addresses:");

	for (i=0; i<info->sector_count; ++i) {
	ulong size;
	int erased;
	ulong flash = (unsigned long ) info->start[i];

	if ((i % 5) == 0) {
	printf ("\n ");
	}

	/*
	* Check if whole sector is erased
	*/
	size =
	(i != (info->sector_count - 1)) ?
	(info->start[i + 1] - info->start[i]) >> 2 :
	(info->start[0] + info->size - info->start[i]) >> 2;

	for (
	flash = (unsigned long *) info->start[i], erased = 1;
	(flash != (unsigned long *) info->start[i] + size) && erased;
	flash++
	)
	erased = *flash == ~0x0UL;

	printf (" %08lX %s %s",
	info->start[i],
	erased ? "E": " ",
	info->protect[i] ? "(RO)" : " ");
	}

	printf ("\n");
	}

	/*-----------------------------------------------------------------------
	*/

	/*
	* The following code cannot be run from FLASH!
	*/

	ulong flash_get_size (FPWV addr, flash_info_t info)
	{
	int i;

	/* Write auto select command: read Manufacturer ID */
	/* Write auto select command sequence and test FLASH answer */
	addr[FLASH_CYCLE1] = (FPW)0x00AA00AA; /* for AMD, Intel ignores this */
	addr[FLASH_CYCLE2] = (FPW)0x00550055; /* for AMD, Intel ignores this */
	addr[FLASH_CYCLE1] = (FPW)0x00900090; /* selects Intel or AMD */

	/* The manufacturer codes are only 1 byte, so just use 1 byte.
	* This works for any bus width and any FLASH device width.
	*/
	udelay(100);
	switch (addr[FLASH_ID1] & 0xff) {

	case (uchar)AMD_MANUFACT:
	info->flash_id = FLASH_MAN_AMD;
	break;

	#if 0
	case (uchar)INTEL_MANUFACT:
	info->flash_id = FLASH_MAN_INTEL;
	break;
	#endif

	default:
	printf ("unknown vendor=%x ", addr[FLASH_ID1] & 0xff);
	info->flash_id = FLASH_UNKNOWN;
	info->sector_count = 0;
	info->size = 0;
	break;
	}

	/* Check 16 bits or 32 bits of ID so work on 32 or 16 bit bus. */
	if (info->flash_id != FLASH_UNKNOWN) switch ((FPW)addr[FLASH_ID2]) {

	case (FPW)AMD_ID_LV160B:
	info->flash_id += FLASH_AM160B;
	info->sector_count = 35;
	info->size = 0x00200000;
	info->start[0] = (ulong)addr;
	info->start[1] = (ulong)addr + 0x4000;
	info->start[2] = (ulong)addr + 0x6000;
	info->start[3] = (ulong)addr + 0x8000;
	for (i = 4; i < info->sector_count; i++)
	{
	info->start[i] = (ulong)addr + 0x10000 * (i-3);
	}
	break;

	case (FPW)AMD_ID_LV065D:
	info->flash_id += FLASH_AMDLV065D;
	info->sector_count = 128;
	info->size = 0x00800000;
	for (i = 0; i < info->sector_count; i++)
	{
	info->start[i] = (ulong)addr + 0x10000 * i;
	}
	break;

	case (FPW)AMD_ID_MIRROR:
	/* MIRROR BIT FLASH, read more ID bytes */
	if ((FPW)addr[FLASH_ID3] == (FPW)AMD_ID_LV640U_2 &&
	(FPW)addr[FLASH_ID4] == (FPW)AMD_ID_LV640U_3)
	{
	info->flash_id += FLASH_AMLV640U;
	info->sector_count = 128;
	info->size = 0x00800000;
	for (i = 0; i < info->sector_count; i++)
	{
	info->start[i] = (ulong)addr + 0x10000 * i;
	}
	break;
	}
	if ((FPW)addr[FLASH_ID3] == (FPW)AMD_ID_LV256U_2 &&
	(FPW)addr[FLASH_ID4] == (FPW)AMD_ID_LV256U_3)
	{
	/* attention: only the first 16 MB will be used in u-boot */
	info->flash_id += FLASH_AMLV256U;
	info->sector_count = 256;
	info->size = 0x01000000;
	for (i = 0; i < info->sector_count; i++)
	{
	info->start[i] = (ulong)addr + 0x10000 * i;
	}
	break;
	}

	/* fall thru to here ! */
	default:
	printf ("unknown AMD device=%x %x %x",
	(FPW)addr[FLASH_ID2],
	(FPW)addr[FLASH_ID3],
	(FPW)addr[FLASH_ID4]);
	info->flash_id = FLASH_UNKNOWN;
	info->sector_count = 0;
	info->size = 0x800000;
	break;
	}

	/* Put FLASH back in read mode */
	flash_reset(info);

	return (info->size);
	}

	/*-----------------------------------------------------------------------
	*/

	int flash_erase (flash_info_t *info, int s_first, int s_last)
	{
	FPWV *addr;
	int flag, prot, sect;
	int intel = (info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL;
	ulong start, now, last;
	int rcode = 0;

	if ((s_first < 0) \|\| (s_first > s_last)) {
	if (info->flash_id == FLASH_UNKNOWN) {
	printf ("- missing\n");
	} else {
	printf ("- no sectors to erase\n");
	}
	return 1;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_AM160B:
	case FLASH_AMLV640U:
	break;
	case FLASH_UNKNOWN:
	default:
	printf ("Can't erase unknown flash type %08lx - aborted\n",
	info->flash_id);
	return 1;
	}

	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");
	}

	last = get_timer(0);

	/* Start erase on unprotected sectors */
	for (sect = s_first; sect<=s_last && rcode == 0; sect++) {

	if (info->protect[sect] != 0) /* protected, skip it */
	continue;

	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts();

	addr = (FPWV *)(info->start[sect]);
	if (intel) {
	addr = (FPW)0x00500050; / clear status register */
	addr = (FPW)0x00200020; / erase setup */
	addr = (FPW)0x00D000D0; / erase confirm */
	}
	else {
	/* must be AMD style if not Intel */
	FPWV base; / first address in bank */

	base = (FPWV *)(info->start[0]);
	base[FLASH_CYCLE1] = (FPW)0x00AA00AA; /* unlock */
	base[FLASH_CYCLE2] = (FPW)0x00550055; /* unlock */
	base[FLASH_CYCLE1] = (FPW)0x00800080; /* erase mode */
	base[FLASH_CYCLE1] = (FPW)0x00AA00AA; /* unlock */
	base[FLASH_CYCLE2] = (FPW)0x00550055; /* unlock */
	addr = (FPW)0x00300030; / erase sector */
	}

	/* re-enable interrupts if necessary */
	if (flag)
	enable_interrupts();

	start = get_timer(0);

	/* wait at least 50us for AMD, 80us for Intel.
	* Let's wait 1 ms.
	*/
	udelay (1000);

	while ((*addr & (FPW)0x00800080) != (FPW)0x00800080) {
	if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
	printf ("Timeout\n");

	if (intel) {
	/* suspend erase */
	*addr = (FPW)0x00B000B0;
	}

	flash_reset(info); /* reset to read mode */
	rcode = 1; /* failed */
	break;
	}

	/* show that we're waiting */
	if ((get_timer(last)) > CFG_HZ) {/* every second */
	putc ('.');
	last = get_timer(0);
	}
	}

	/* show that we're waiting */
	if ((get_timer(last)) > CFG_HZ) { /* every second */
	putc ('.');
	last = get_timer(0);
	}

	flash_reset(info); /* reset to read mode */
	}

	printf (" done\n");
	return rcode;
	}

	/*-----------------------------------------------------------------------
	* Copy memory to flash, returns:
	* 0 - OK
	* 1 - write timeout
	* 2 - Flash not erased
	*/
	int write_buff (flash_info_t info, uchar src, ulong addr, ulong cnt)
	{
	FPW data = 0; /* 16 or 32 bit word, matches flash bus width on MPC8XX */
	int bytes; /* number of bytes to program in current word */
	int left; /* number of bytes left to program */
	int i, res;

	for (left = cnt, res = 0;
	left > 0 && res == 0;
	addr += sizeof(data), left -= sizeof(data) - bytes) {

	bytes = addr & (sizeof(data) - 1);
	addr &= ~(sizeof(data) - 1);

	/* combine source and destination data so can program
	* an entire word of 16 or 32 bits
	*/
	for (i = 0; i < sizeof(data); i++) {
	data <<= 8;
	if (i < bytes \|\| i - bytes >= left )
	data += ((uchar )addr + i);
	else
	data += *src++;
	}

	/* write one word to the flash */
	switch (info->flash_id & FLASH_VENDMASK) {
	case FLASH_MAN_AMD:
	res = write_word_amd(info, (FPWV *)addr, data);
	break;
	default:
	/* unknown flash type, error! */
	printf ("missing or unknown FLASH type\n");
	res = 1; /* not really a timeout, but gives error */
	break;
	}
	}

	return (res);
	}

	/*-----------------------------------------------------------------------
	* Write a word to Flash for AMD FLASH
	* A word is 16 or 32 bits, whichever the bus width of the flash bank
	* (not an individual chip) is.
	*
	* returns:
	* 0 - OK
	* 1 - write timeout
	* 2 - Flash not erased
	*/
	static int write_word_amd (flash_info_t info, FPWV dest, FPW data)
	{
	ulong start;
	int flag;
	int res = 0; /* result, assume success */
	FPWV base; / first address in flash bank */

	/* Check if Flash is (sufficiently) erased */
	if ((*dest & data) != data) {
	return (2);
	}


	base = (FPWV *)(info->start[0]);

	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts();

	base[FLASH_CYCLE1] = (FPW)0x00AA00AA; /* unlock */
	base[FLASH_CYCLE2] = (FPW)0x00550055; /* unlock */
	base[FLASH_CYCLE1] = (FPW)0x00A000A0; /* selects program mode */

	dest = data; / start programming the data */

	/* re-enable interrupts if necessary */
	if (flag)
	enable_interrupts();

	start = get_timer (0);

	/* data polling for D7 */
	while (res == 0 && (*dest & (FPW)0x00800080) != (data & (FPW)0x00800080)) {
	if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
	dest = (FPW)0x00F000F0; / reset bank */
	res = 1;
	}
	}

	return (res);
	}