board/trab/flash.c - uboot/prism - Git at Google

 /*
  * (C) Copyright 2002
  * Gary Jennejohn, DENX Software Engineering, <garyj@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., 59 Temple Place, Suite 330, Boston,
  * MA 02111-1307 USA
  */

 /* #define DEBUG */

 #include <common.h>
 #include <environment.h>

 static ulong flash_get_size (vu_long *addr, flash_info_t *info);

 flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];


 #define CMD_READ_ARRAY		0x00F000F0
 #define CMD_UNLOCK1		0x00AA00AA
 #define CMD_UNLOCK2		0x00550055
 #define CMD_ERASE_SETUP		0x00800080
 #define CMD_ERASE_CONFIRM	0x00300030
 #define CMD_PROGRAM		0x00A000A0
 #define CMD_UNLOCK_BYPASS	0x00200020
 #define CMD_READ_MANF_ID	0x00900090
 #define CMD_UNLOCK_BYPASS_RES1	0x00900090
 #define CMD_UNLOCK_BYPASS_RES2	0x00000000

 #define MEM_FLASH_ADDR		(*(volatile u32 *)CONFIG_SYS_FLASH_BASE)
 #define MEM_FLASH_ADDR1		(*(volatile u32 *)(CONFIG_SYS_FLASH_BASE + (0x00000555 << 2)))
 #define MEM_FLASH_ADDR2		(*(volatile u32 *)(CONFIG_SYS_FLASH_BASE + (0x000002AA << 2)))

 #define BIT_ERASE_DONE		0x00800080
 #define BIT_RDY_MASK		0x00800080
 #define BIT_PROGRAM_ERROR	0x00200020
 #define BIT_TIMEOUT		0x80000000	/* our flag */

 #define READY 1
 #define ERR   2
 #define TMO   4

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

 ulong flash_init (void)
 {
 	int i, j;
 	ulong size = 0;

 	for (i=0; i<CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
 		ulong flashbase = 0;
 		flash_info_t *info = &flash_info[i];

 		/* Init: no FLASHes known */
 		info->flash_id = FLASH_UNKNOWN;

 		size += flash_get_size (CONFIG_SYS_FLASH_BASE, info);

 		if (i == 0)
 			flashbase = CONFIG_SYS_FLASH_BASE;
 		else
 			panic ("configured too many flash banks!\n");
 		for (j = 0; j < info->sector_count; j++) {

 			info->protect[j] = 0;
 			info->start[j] = flashbase;

 			switch (info->flash_id & FLASH_TYPEMASK) {
 			case (FLASH_AM320B & FLASH_TYPEMASK):
 			case (FLASH_MXLV320B & FLASH_TYPEMASK):
 				/* Boot sector type: 8 x 8 + N x 128 kB */
 				flashbase += (j < 8) ? 0x4000 : 0x20000;
 				break;
 			case (FLASH_AM640U & FLASH_TYPEMASK):
 				/* Uniform sector type: 128 kB */
 				flashbase += 0x20000;
 				break;
 			default:
 				printf ("## Bad flash chip type 0x%04lX\n",
 					info->flash_id & FLASH_TYPEMASK);
 			}
 		}
 	}

 	/*
 	 * Protect monitor and environment sectors
 	 */
 	flash_protect ( FLAG_PROTECT_SET,
 			CONFIG_SYS_FLASH_BASE,
 			CONFIG_SYS_FLASH_BASE + monitor_flash_len - 1,
 			&flash_info[0]);

 	flash_protect ( FLAG_PROTECT_SET,
 			CONFIG_ENV_ADDR,
 			CONFIG_ENV_ADDR + CONFIG_ENV_SECT_SIZE - 1, &flash_info[0]);

 #ifdef CONFIG_ENV_ADDR_REDUND
 	flash_protect ( FLAG_PROTECT_SET,
 			CONFIG_ENV_ADDR_REDUND,
 			CONFIG_ENV_ADDR_REDUND + CONFIG_ENV_SECT_SIZE - 1,
 			&flash_info[0]);
 #endif

 	return size;
 }

 /*-----------------------------------------------------------------------
  */
 void flash_print_info (flash_info_t * info)
 {
 	int i;

 	switch (info->flash_id & FLASH_VENDMASK) {
 	case (FLASH_MAN_AMD & FLASH_VENDMASK):
 			printf ("AMD ");		break;
 	case (FLASH_MAN_FUJ & FLASH_VENDMASK):
 			printf ("FUJITSU ");		break;
 	case (FLASH_MAN_MX  & FLASH_VENDMASK):
 			printf ("MACRONIX ");		break;
 	default:	printf ("Unknown Vendor ");	break;
 	}

 	switch (info->flash_id & FLASH_TYPEMASK) {
 	case (FLASH_AM320B & FLASH_TYPEMASK):
 		printf ("2x Am29LV320DB (32Mbit)\n");
 		break;
 	case (FLASH_MXLV320B & FLASH_TYPEMASK):
 		printf ("2x MX29LV320DB (32Mbit)\n");
 		break;
 	case (FLASH_AM640U & FLASH_TYPEMASK):
 		printf ("2x Am29LV640D (64Mbit)\n");
 		break;
 	default:
 		printf ("Unknown Chip Type\n");
 		goto Done;
 		break;
 	}

 	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++) {
 		if ((i % 5) == 0) {
 			printf ("\n   ");
 		}
 		printf (" %08lX%s",
 			info->start[i],
 			info->protect[i] ? " (RO)" : "     ");
 	}
 	printf ("\n");

 Done:	;
 }

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

 int flash_erase (flash_info_t * info, int s_first, int s_last)
 {
 	ulong result;

 #if 0
 	int cflag;
 #endif
 	int iflag, prot, sect;
 	int rc = ERR_OK;
 	int chip1, chip2;

 	debug ("flash_erase: s_first %d  s_last %d\n", s_first, s_last);

 	/* first look for protection bits */

 	if (info->flash_id == FLASH_UNKNOWN)
 		return ERR_UNKNOWN_FLASH_TYPE;

 	if ((s_first < 0) || (s_first > s_last)) {
 		return ERR_INVAL;
 	}

 	switch (info->flash_id & FLASH_VENDMASK) {
 	case (FLASH_MAN_AMD & FLASH_VENDMASK):	break;	/* OK */
 	case (FLASH_MAN_FUJ & FLASH_VENDMASK):	break;	/* OK */
 	case (FLASH_MAN_MX  & FLASH_VENDMASK):	break;	/* OK */
 	default:
 		debug ("## flash_erase: unknown manufacturer\n");
 		return (ERR_UNKNOWN_FLASH_VENDOR);
 	}

 	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");
 	}

 	/*
 	 * Disable interrupts which might cause a timeout
 	 * here. Remember that our exception vectors are
 	 * at address 0 in the flash, and we don't want a
 	 * (ticker) exception to happen while the flash
 	 * chip is in programming mode.
 	 */
 #if 0
 	cflag = icache_status ();
 	icache_disable ();
 #endif
 	iflag = disable_interrupts ();

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

 		debug ("Erasing sector %2d @ %08lX... ",
 			sect, info->start[sect]);

 		/* arm simple, non interrupt dependent timer */
 		reset_timer_masked ();

 		if (info->protect[sect] == 0) {	/* not protected */
 			vu_long *addr = (vu_long *) (info->start[sect]);

 			MEM_FLASH_ADDR1 = CMD_UNLOCK1;
 			MEM_FLASH_ADDR2 = CMD_UNLOCK2;
 			MEM_FLASH_ADDR1 = CMD_ERASE_SETUP;

 			MEM_FLASH_ADDR1 = CMD_UNLOCK1;
 			MEM_FLASH_ADDR2 = CMD_UNLOCK2;
 			*addr = CMD_ERASE_CONFIRM;

 			/* wait until flash is ready */
 			chip1 = chip2 = 0;

 			do {
 				result = *addr;

 				/* check timeout */
 				if (get_timer_masked () > CONFIG_SYS_FLASH_ERASE_TOUT) {
 					MEM_FLASH_ADDR1 = CMD_READ_ARRAY;
 					chip1 = TMO;
 					break;
 				}

 				if (!chip1 && (result & 0xFFFF) & BIT_ERASE_DONE)
 					chip1 = READY;

 				if (!chip1 && (result & 0xFFFF) & BIT_PROGRAM_ERROR)
 					chip1 = ERR;

 				if (!chip2 && (result >> 16) & BIT_ERASE_DONE)
 					chip2 = READY;

 				if (!chip2 && (result >> 16) & BIT_PROGRAM_ERROR)
 					chip2 = ERR;

 			} while (!chip1 || !chip2);

 			MEM_FLASH_ADDR1 = CMD_READ_ARRAY;

 			if (chip1 == ERR || chip2 == ERR) {
 				rc = ERR_PROG_ERROR;
 				printf ("Flash erase error\n");
 				goto outahere;
 			}
 			if (chip1 == TMO) {
 				rc = ERR_TIMOUT;
 				printf ("Flash erase timeout error\n");
 				goto outahere;
 			}
 		}
 	}

 outahere:
 	/* allow flash to settle - wait 10 ms */
 	udelay_masked (10000);

 	if (iflag)
 		enable_interrupts ();

 #if 0
 	if (cflag)
 		icache_enable ();
 #endif
 	return rc;
 }

 /*-----------------------------------------------------------------------
  * Copy memory to flash
  */

 static int write_word (flash_info_t * info, ulong dest, ulong data)
 {
 	vu_long *addr = (vu_long *) dest;
 	ulong result;
 	int rc = ERR_OK;

 #if 0
 	int cflag;
 #endif
 	int iflag;
 	int chip1, chip2;

 	/*
 	 * Check if Flash is (sufficiently) erased
 	 */
 	result = *addr;
 	if ((result & data) != data)
 		return ERR_NOT_ERASED;

 	/*
 	 * Disable interrupts which might cause a timeout
 	 * here. Remember that our exception vectors are
 	 * at address 0 in the flash, and we don't want a
 	 * (ticker) exception to happen while the flash
 	 * chip is in programming mode.
 	 */
 #if 0
 	cflag = icache_status ();
 	icache_disable ();
 #endif
 	iflag = disable_interrupts ();

 	MEM_FLASH_ADDR1 = CMD_UNLOCK1;
 	MEM_FLASH_ADDR2 = CMD_UNLOCK2;
 	MEM_FLASH_ADDR1 = CMD_PROGRAM;
 	*addr = data;

 	/* arm simple, non interrupt dependent timer */
 	reset_timer_masked ();

 	/* wait until flash is ready */
 	chip1 = chip2 = 0;
 	do {
 		result = *addr;

 		/* check timeout */
 		if (get_timer_masked () > CONFIG_SYS_FLASH_WRITE_TOUT) {
 			chip1 = ERR | TMO;
 			break;
 		}
 		if (!chip1 && ((result & 0x80) == (data & 0x80)))
 			chip1 = READY;

 		if (!chip1 && ((result & 0xFFFF) & BIT_PROGRAM_ERROR)) {
 			result = *addr;

 			if ((result & 0x80) == (data & 0x80))
 				chip1 = READY;
 			else
 				chip1 = ERR;
 		}

 		if (!chip2 && ((result & (0x80 << 16)) == (data & (0x80 << 16))))
 			chip2 = READY;

 		if (!chip2 && ((result >> 16) & BIT_PROGRAM_ERROR)) {
 			result = *addr;

 			if ((result & (0x80 << 16)) == (data & (0x80 << 16)))
 				chip2 = READY;
 			else
 				chip2 = ERR;
 		}

 	} while (!chip1 || !chip2);

 	*addr = CMD_READ_ARRAY;

 	if (chip1 == ERR || chip2 == ERR || *addr != data) {
 		rc = ERR_PROG_ERROR;
 		printf ("Flash program error\n");
 		debug ("chip1: %#x, chip2: %#x, addr: %#lx *addr: %#lx, "
 		       "data: %#lx\n",
 		       chip1, chip2, addr, *addr, data);
 	}

 	if (iflag)
 		enable_interrupts ();

 #if 0
 	if (cflag)
 		icache_enable ();
 #endif

 	return rc;
 }

 /*-----------------------------------------------------------------------
  * Copy memory to flash.
  */

 int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
 {
 	ulong cp, wp, data;
 	int l;
 	int i, rc;

 	wp = (addr & ~3);	/* get lower word aligned address */

 	/*
 	 * handle unaligned start bytes
 	 */
 	if ((l = addr - wp) != 0) {
 		data = 0;
 		for (i = 0, cp = wp; i < l; ++i, ++cp) {
 			data = (data >> 8) | (*(uchar *) cp << 24);
 		}
 		for (; i < 4 && cnt > 0; ++i) {
 			data = (data >> 8) | (*src++ << 24);
 			--cnt;
 			++cp;
 		}
 		for (; cnt == 0 && i < 4; ++i, ++cp) {
 			data = (data >> 8) | (*(uchar *) cp << 24);
 		}

 		if ((rc = write_word (info, wp, data)) != 0) {
 			goto Done;
 		}
 		wp += 4;
 	}

 	/*
 	 * handle word aligned part
 	 */
 	while (cnt >= 4) {
 		if (((ulong)src) & 0x3) {
 			for (i = 0; i < 4; i++) {
 				((char *)&data)[i] = ((vu_char *)src)[i];
 			}
 		}
 		else {
 			data = *((vu_long *) src);
 		}

 		if ((rc = write_word (info, wp, data)) != 0) {
 			goto Done;
 		}
 		src += 4;
 		wp += 4;
 		cnt -= 4;
 	}

 	if (cnt == 0) {
 		rc = ERR_OK;
 		goto Done;
 	}

 	/*
 	 * handle unaligned tail bytes
 	 */
 	data = 0;
 	for (i = 0, cp = wp; i < 4 && cnt > 0; ++i, ++cp) {
 		data = (data >> 8) | (*src++ << 24);
 		--cnt;
 	}
 	for (; i < 4; ++i, ++cp) {
 		data = (data >> 8) | (*(uchar *) cp << 24);
 	}

 	rc = write_word (info, wp, data);

 	Done:

 	return (rc);
 }

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

 static ulong flash_get_size (vu_long *addr, flash_info_t *info)
 {
 	ulong value;

 	/* Write auto select command sequence and read Manufacturer ID */
 	addr[0x0555] = CMD_UNLOCK1;
 	addr[0x02AA] = CMD_UNLOCK2;
 	addr[0x0555] = CMD_READ_MANF_ID;

 	value = addr[0];

 	debug ("Manuf. ID @ 0x%08lx: 0x%08lx\n", (ulong)addr, value);

 	switch (value) {
 	case AMD_MANUFACT:
 		info->flash_id = FLASH_MAN_AMD;
 		break;
 	case FUJ_MANUFACT:
 		info->flash_id = FLASH_MAN_FUJ;
 		break;
 	case MX_MANUFACT:
 		info->flash_id = FLASH_MAN_MX;
 		break;
 	default:
 		info->flash_id = FLASH_UNKNOWN;
 		info->sector_count = 0;
 		info->size = 0;
 		addr[0] = CMD_READ_ARRAY;	/* restore read mode */
 		debug ("## flash_init: unknown manufacturer\n");
 		return (0);			/* no or unknown flash	*/
 	}

 	value = addr[1];			/* device ID		*/

 	debug ("Device ID @ 0x%08lx: 0x%08lx\n", (ulong)(&addr[1]), value);

 	switch (value) {
 	case AMD_ID_LV320B:
 		info->flash_id += FLASH_AM320B;
 		info->sector_count = 71;
 		info->size = 0x00800000;

 		addr[0] = CMD_READ_ARRAY;	/* restore read mode */
 		break;				/* =>  8 MB		*/

 	case AMD_ID_LV640U:
 		info->flash_id += FLASH_AM640U;
 		info->sector_count = 128;
 		info->size = 0x01000000;

 		addr[0] = CMD_READ_ARRAY;	/* restore read mode */
 		break;				/* => 16 MB		*/

 	case MX_ID_LV320B:
 		info->flash_id += FLASH_MXLV320B;
 		info->sector_count = 71;
 		info->size = 0x00800000;

 		addr[0] = CMD_READ_ARRAY;	/* restore read mode */
 		break;				/* =>  8 MB		*/

 	default:
 		debug ("## flash_init: unknown flash chip\n");
 		info->flash_id = FLASH_UNKNOWN;
 		addr[0] = CMD_READ_ARRAY;	/* restore read mode */
 		return (0);			/* => no or unknown flash */

 	}

 	if (info->sector_count > CONFIG_SYS_MAX_FLASH_SECT) {
 		printf ("** ERROR: sector count %d > max (%d) **\n",
 			info->sector_count, CONFIG_SYS_MAX_FLASH_SECT);
 		info->sector_count = CONFIG_SYS_MAX_FLASH_SECT;
 	}

 	return (info->size);
 }
	/*
	* (C) Copyright 2002
	* Gary Jennejohn, DENX Software Engineering, <garyj@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., 59 Temple Place, Suite 330, Boston,
	* MA 02111-1307 USA
	*/

	/* #define DEBUG */

	#include <common.h>
	#include <environment.h>

	static ulong flash_get_size (vu_long addr, flash_info_t info);

	flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];


	#define CMD_READ_ARRAY 0x00F000F0
	#define CMD_UNLOCK1 0x00AA00AA
	#define CMD_UNLOCK2 0x00550055
	#define CMD_ERASE_SETUP 0x00800080
	#define CMD_ERASE_CONFIRM 0x00300030
	#define CMD_PROGRAM 0x00A000A0
	#define CMD_UNLOCK_BYPASS 0x00200020
	#define CMD_READ_MANF_ID 0x00900090
	#define CMD_UNLOCK_BYPASS_RES1 0x00900090
	#define CMD_UNLOCK_BYPASS_RES2 0x00000000

	#define MEM_FLASH_ADDR ((volatile u32 )CONFIG_SYS_FLASH_BASE)
	#define MEM_FLASH_ADDR1 ((volatile u32 )(CONFIG_SYS_FLASH_BASE + (0x00000555 << 2)))
	#define MEM_FLASH_ADDR2 ((volatile u32 )(CONFIG_SYS_FLASH_BASE + (0x000002AA << 2)))

	#define BIT_ERASE_DONE 0x00800080
	#define BIT_RDY_MASK 0x00800080
	#define BIT_PROGRAM_ERROR 0x00200020
	#define BIT_TIMEOUT 0x80000000 /* our flag */

	#define READY 1
	#define ERR 2
	#define TMO 4

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

	ulong flash_init (void)
	{
	int i, j;
	ulong size = 0;

	for (i=0; i<CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
	ulong flashbase = 0;
	flash_info_t *info = &flash_info[i];

	/* Init: no FLASHes known */
	info->flash_id = FLASH_UNKNOWN;

	size += flash_get_size (CONFIG_SYS_FLASH_BASE, info);

	if (i == 0)
	flashbase = CONFIG_SYS_FLASH_BASE;
	else
	panic ("configured too many flash banks!\n");
	for (j = 0; j < info->sector_count; j++) {

	info->protect[j] = 0;
	info->start[j] = flashbase;

	switch (info->flash_id & FLASH_TYPEMASK) {
	case (FLASH_AM320B & FLASH_TYPEMASK):
	case (FLASH_MXLV320B & FLASH_TYPEMASK):
	/* Boot sector type: 8 x 8 + N x 128 kB */
	flashbase += (j < 8) ? 0x4000 : 0x20000;
	break;
	case (FLASH_AM640U & FLASH_TYPEMASK):
	/* Uniform sector type: 128 kB */
	flashbase += 0x20000;
	break;
	default:
	printf ("## Bad flash chip type 0x%04lX\n",
	info->flash_id & FLASH_TYPEMASK);
	}
	}
	}

	/*
	* Protect monitor and environment sectors
	*/
	flash_protect ( FLAG_PROTECT_SET,
	CONFIG_SYS_FLASH_BASE,
	CONFIG_SYS_FLASH_BASE + monitor_flash_len - 1,
	&flash_info[0]);

	flash_protect ( FLAG_PROTECT_SET,
	CONFIG_ENV_ADDR,
	CONFIG_ENV_ADDR + CONFIG_ENV_SECT_SIZE - 1, &flash_info[0]);

	#ifdef CONFIG_ENV_ADDR_REDUND
	flash_protect ( FLAG_PROTECT_SET,
	CONFIG_ENV_ADDR_REDUND,
	CONFIG_ENV_ADDR_REDUND + CONFIG_ENV_SECT_SIZE - 1,
	&flash_info[0]);
	#endif

	return size;
	}

	/*-----------------------------------------------------------------------
	*/
	void flash_print_info (flash_info_t * info)
	{
	int i;

	switch (info->flash_id & FLASH_VENDMASK) {
	case (FLASH_MAN_AMD & FLASH_VENDMASK):
	printf ("AMD "); break;
	case (FLASH_MAN_FUJ & FLASH_VENDMASK):
	printf ("FUJITSU "); break;
	case (FLASH_MAN_MX & FLASH_VENDMASK):
	printf ("MACRONIX "); break;
	default: printf ("Unknown Vendor "); break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case (FLASH_AM320B & FLASH_TYPEMASK):
	printf ("2x Am29LV320DB (32Mbit)\n");
	break;
	case (FLASH_MXLV320B & FLASH_TYPEMASK):
	printf ("2x MX29LV320DB (32Mbit)\n");
	break;
	case (FLASH_AM640U & FLASH_TYPEMASK):
	printf ("2x Am29LV640D (64Mbit)\n");
	break;
	default:
	printf ("Unknown Chip Type\n");
	goto Done;
	break;
	}

	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++) {
	if ((i % 5) == 0) {
	printf ("\n ");
	}
	printf (" %08lX%s",
	info->start[i],
	info->protect[i] ? " (RO)" : " ");
	}
	printf ("\n");

	Done: ;
	}

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

	int flash_erase (flash_info_t * info, int s_first, int s_last)
	{
	ulong result;

	#if 0
	int cflag;
	#endif
	int iflag, prot, sect;
	int rc = ERR_OK;
	int chip1, chip2;

	debug ("flash_erase: s_first %d s_last %d\n", s_first, s_last);

	/* first look for protection bits */

	if (info->flash_id == FLASH_UNKNOWN)
	return ERR_UNKNOWN_FLASH_TYPE;

	if ((s_first < 0) \|\| (s_first > s_last)) {
	return ERR_INVAL;
	}

	switch (info->flash_id & FLASH_VENDMASK) {
	case (FLASH_MAN_AMD & FLASH_VENDMASK): break; /* OK */
	case (FLASH_MAN_FUJ & FLASH_VENDMASK): break; /* OK */
	case (FLASH_MAN_MX & FLASH_VENDMASK): break; /* OK */
	default:
	debug ("## flash_erase: unknown manufacturer\n");
	return (ERR_UNKNOWN_FLASH_VENDOR);
	}

	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");
	}

	/*
	* Disable interrupts which might cause a timeout
	* here. Remember that our exception vectors are
	* at address 0 in the flash, and we don't want a
	* (ticker) exception to happen while the flash
	* chip is in programming mode.
	*/
	#if 0
	cflag = icache_status ();
	icache_disable ();
	#endif
	iflag = disable_interrupts ();

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

	debug ("Erasing sector %2d @ %08lX... ",
	sect, info->start[sect]);

	/* arm simple, non interrupt dependent timer */
	reset_timer_masked ();

	if (info->protect[sect] == 0) { /* not protected */
	vu_long addr = (vu_long ) (info->start[sect]);

	MEM_FLASH_ADDR1 = CMD_UNLOCK1;
	MEM_FLASH_ADDR2 = CMD_UNLOCK2;
	MEM_FLASH_ADDR1 = CMD_ERASE_SETUP;

	MEM_FLASH_ADDR1 = CMD_UNLOCK1;
	MEM_FLASH_ADDR2 = CMD_UNLOCK2;
	*addr = CMD_ERASE_CONFIRM;

	/* wait until flash is ready */
	chip1 = chip2 = 0;

	do {
	result = *addr;

	/* check timeout */
	if (get_timer_masked () > CONFIG_SYS_FLASH_ERASE_TOUT) {
	MEM_FLASH_ADDR1 = CMD_READ_ARRAY;
	chip1 = TMO;
	break;
	}

	if (!chip1 && (result & 0xFFFF) & BIT_ERASE_DONE)
	chip1 = READY;

	if (!chip1 && (result & 0xFFFF) & BIT_PROGRAM_ERROR)
	chip1 = ERR;

	if (!chip2 && (result >> 16) & BIT_ERASE_DONE)
	chip2 = READY;

	if (!chip2 && (result >> 16) & BIT_PROGRAM_ERROR)
	chip2 = ERR;

	} while (!chip1 \|\| !chip2);

	MEM_FLASH_ADDR1 = CMD_READ_ARRAY;

	if (chip1 == ERR \|\| chip2 == ERR) {
	rc = ERR_PROG_ERROR;
	printf ("Flash erase error\n");
	goto outahere;
	}
	if (chip1 == TMO) {
	rc = ERR_TIMOUT;
	printf ("Flash erase timeout error\n");
	goto outahere;
	}
	}
	}

	outahere:
	/* allow flash to settle - wait 10 ms */
	udelay_masked (10000);

	if (iflag)
	enable_interrupts ();

	#if 0
	if (cflag)
	icache_enable ();
	#endif
	return rc;
	}

	/*-----------------------------------------------------------------------
	* Copy memory to flash
	*/

	static int write_word (flash_info_t * info, ulong dest, ulong data)
	{
	vu_long addr = (vu_long ) dest;
	ulong result;
	int rc = ERR_OK;

	#if 0
	int cflag;
	#endif
	int iflag;
	int chip1, chip2;

	/*
	* Check if Flash is (sufficiently) erased
	*/
	result = *addr;
	if ((result & data) != data)
	return ERR_NOT_ERASED;

	/*
	* Disable interrupts which might cause a timeout
	* here. Remember that our exception vectors are
	* at address 0 in the flash, and we don't want a
	* (ticker) exception to happen while the flash
	* chip is in programming mode.
	*/
	#if 0
	cflag = icache_status ();
	icache_disable ();
	#endif
	iflag = disable_interrupts ();

	MEM_FLASH_ADDR1 = CMD_UNLOCK1;
	MEM_FLASH_ADDR2 = CMD_UNLOCK2;
	MEM_FLASH_ADDR1 = CMD_PROGRAM;
	*addr = data;

	/* arm simple, non interrupt dependent timer */
	reset_timer_masked ();

	/* wait until flash is ready */
	chip1 = chip2 = 0;
	do {
	result = *addr;

	/* check timeout */
	if (get_timer_masked () > CONFIG_SYS_FLASH_WRITE_TOUT) {
	chip1 = ERR \| TMO;
	break;
	}
	if (!chip1 && ((result & 0x80) == (data & 0x80)))
	chip1 = READY;

	if (!chip1 && ((result & 0xFFFF) & BIT_PROGRAM_ERROR)) {
	result = *addr;

	if ((result & 0x80) == (data & 0x80))
	chip1 = READY;
	else
	chip1 = ERR;
	}

	if (!chip2 && ((result & (0x80 << 16)) == (data & (0x80 << 16))))
	chip2 = READY;

	if (!chip2 && ((result >> 16) & BIT_PROGRAM_ERROR)) {
	result = *addr;

	if ((result & (0x80 << 16)) == (data & (0x80 << 16)))
	chip2 = READY;
	else
	chip2 = ERR;
	}

	} while (!chip1 \|\| !chip2);

	*addr = CMD_READ_ARRAY;

	if (chip1 == ERR \|\| chip2 == ERR \|\| *addr != data) {
	rc = ERR_PROG_ERROR;
	printf ("Flash program error\n");
	debug ("chip1: %#x, chip2: %#x, addr: %#lx *addr: %#lx, "
	"data: %#lx\n",
	chip1, chip2, addr, *addr, data);
	}

	if (iflag)
	enable_interrupts ();

	#if 0
	if (cflag)
	icache_enable ();
	#endif

	return rc;
	}

	/*-----------------------------------------------------------------------
	* Copy memory to flash.
	*/

	int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
	{
	ulong cp, wp, data;
	int l;
	int i, rc;

	wp = (addr & ~3); /* get lower word aligned address */

	/*
	* handle unaligned start bytes
	*/
	if ((l = addr - wp) != 0) {
	data = 0;
	for (i = 0, cp = wp; i < l; ++i, ++cp) {
	data = (data >> 8) \| ((uchar ) cp << 24);
	}
	for (; i < 4 && cnt > 0; ++i) {
	data = (data >> 8) \| (*src++ << 24);
	--cnt;
	++cp;
	}
	for (; cnt == 0 && i < 4; ++i, ++cp) {
	data = (data >> 8) \| ((uchar ) cp << 24);
	}

	if ((rc = write_word (info, wp, data)) != 0) {
	goto Done;
	}
	wp += 4;
	}

	/*
	* handle word aligned part
	*/
	while (cnt >= 4) {
	if (((ulong)src) & 0x3) {
	for (i = 0; i < 4; i++) {
	((char )&data)[i] = ((vu_char )src)[i];
	}
	}
	else {
	data = ((vu_long ) src);
	}

	if ((rc = write_word (info, wp, data)) != 0) {
	goto Done;
	}
	src += 4;
	wp += 4;
	cnt -= 4;
	}

	if (cnt == 0) {
	rc = ERR_OK;
	goto Done;
	}

	/*
	* handle unaligned tail bytes
	*/
	data = 0;
	for (i = 0, cp = wp; i < 4 && cnt > 0; ++i, ++cp) {
	data = (data >> 8) \| (*src++ << 24);
	--cnt;
	}
	for (; i < 4; ++i, ++cp) {
	data = (data >> 8) \| ((uchar ) cp << 24);
	}

	rc = write_word (info, wp, data);

	Done:

	return (rc);
	}

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

	static ulong flash_get_size (vu_long addr, flash_info_t info)
	{
	ulong value;

	/* Write auto select command sequence and read Manufacturer ID */
	addr[0x0555] = CMD_UNLOCK1;
	addr[0x02AA] = CMD_UNLOCK2;
	addr[0x0555] = CMD_READ_MANF_ID;

	value = addr[0];

	debug ("Manuf. ID @ 0x%08lx: 0x%08lx\n", (ulong)addr, value);

	switch (value) {
	case AMD_MANUFACT:
	info->flash_id = FLASH_MAN_AMD;
	break;
	case FUJ_MANUFACT:
	info->flash_id = FLASH_MAN_FUJ;
	break;
	case MX_MANUFACT:
	info->flash_id = FLASH_MAN_MX;
	break;
	default:
	info->flash_id = FLASH_UNKNOWN;
	info->sector_count = 0;
	info->size = 0;
	addr[0] = CMD_READ_ARRAY; /* restore read mode */
	debug ("## flash_init: unknown manufacturer\n");
	return (0); /* no or unknown flash */
	}

	value = addr[1]; /* device ID */

	debug ("Device ID @ 0x%08lx: 0x%08lx\n", (ulong)(&addr[1]), value);

	switch (value) {
	case AMD_ID_LV320B:
	info->flash_id += FLASH_AM320B;
	info->sector_count = 71;
	info->size = 0x00800000;

	addr[0] = CMD_READ_ARRAY; /* restore read mode */
	break; /* => 8 MB */

	case AMD_ID_LV640U:
	info->flash_id += FLASH_AM640U;
	info->sector_count = 128;
	info->size = 0x01000000;

	addr[0] = CMD_READ_ARRAY; /* restore read mode */
	break; /* => 16 MB */

	case MX_ID_LV320B:
	info->flash_id += FLASH_MXLV320B;
	info->sector_count = 71;
	info->size = 0x00800000;

	addr[0] = CMD_READ_ARRAY; /* restore read mode */
	break; /* => 8 MB */

	default:
	debug ("## flash_init: unknown flash chip\n");
	info->flash_id = FLASH_UNKNOWN;
	addr[0] = CMD_READ_ARRAY; /* restore read mode */
	return (0); /* => no or unknown flash */

	}

	if (info->sector_count > CONFIG_SYS_MAX_FLASH_SECT) {
	printf (" ERROR: sector count %d > max (%d) \n",
	info->sector_count, CONFIG_SYS_MAX_FLASH_SECT);
	info->sector_count = CONFIG_SYS_MAX_FLASH_SECT;
	}

	return (info->size);
	}