board/samsung/smdk2400/flash.c - github/trini/u-boot - Gitiles

 /*
  * (C) Copyright 2002
  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
  * Marius Groeger <mgroeger@sysgo.de>
  *
  * (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>

 #define FLASH_BANK_SIZE 0x1000000	/* 2 x   8 MB */
 #define MAIN_SECT_SIZE  0x40000		/* 2 x 128 kB */

 flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];


 #define CMD_READ_ARRAY		0x00FF00FF
 #define CMD_IDENTIFY		0x00900090
 #define CMD_ERASE_SETUP		0x00200020
 #define CMD_ERASE_CONFIRM	0x00D000D0
 #define CMD_PROGRAM		0x00400040
 #define CMD_RESUME		0x00D000D0
 #define CMD_SUSPEND		0x00B000B0
 #define CMD_STATUS_READ		0x00700070
 #define CMD_STATUS_RESET	0x00500050

 #define BIT_BUSY		0x00800080
 #define BIT_ERASE_SUSPEND	0x00400040
 #define BIT_ERASE_ERROR		0x00200020
 #define BIT_PROGRAM_ERROR	0x00100010
 #define BIT_VPP_RANGE_ERROR	0x00080008
 #define BIT_PROGRAM_SUSPEND	0x00040004
 #define BIT_PROTECT_ERROR	0x00020002
 #define BIT_UNDEFINED		0x00010001

 #define BIT_SEQUENCE_ERROR	0x00300030
 #define BIT_TIMEOUT		0x80000000

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

 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[i].flash_id =
 			(INTEL_MANUFACT     & FLASH_VENDMASK) |
 			(INTEL_ID_28F640J3A & FLASH_TYPEMASK);
 		flash_info[i].size = FLASH_BANK_SIZE;
 		flash_info[i].sector_count = CONFIG_SYS_MAX_FLASH_SECT;
 		memset (flash_info[i].protect, 0, CONFIG_SYS_MAX_FLASH_SECT);
 		if (i == 0)
 			flashbase = CONFIG_SYS_FLASH_BASE;
 		else
 			panic ("configured too many flash banks!\n");
 		for (j = 0; j < flash_info[i].sector_count; j++) {
 			flash_info[i].start[j] = flashbase;

 			/* uniform sector size */
 			flashbase += MAIN_SECT_SIZE;
 		}
 		size += flash_info[i].size;
 	}

 	/*
 	 * 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 (INTEL_MANUFACT & FLASH_VENDMASK):
 		printf ("Intel: ");
 		break;
 	default:
 		printf ("Unknown Vendor ");
 		break;
 	}

 	switch (info->flash_id & FLASH_TYPEMASK) {
 	case (INTEL_ID_28F640J3A & FLASH_TYPEMASK):
 		printf ("2x 28F640J3A (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_error (ulong code)
 {
 	/* Check bit patterns */
 	/* SR.7=0 is busy, SR.7=1 is ready */
 	/* all other flags indicate error on 1 */
 	/* SR.0 is undefined */
 	/* Timeout is our faked flag */

 	/* sequence is described in Intel 290644-005 document */

 	/* check Timeout */
 	if (code & BIT_TIMEOUT) {
 		puts ("Timeout\n");
 		return ERR_TIMOUT;
 	}

 	/* check Busy, SR.7 */
 	if (~code & BIT_BUSY) {
 		puts ("Busy\n");
 		return ERR_PROG_ERROR;
 	}

 	/* check Vpp low, SR.3 */
 	if (code & BIT_VPP_RANGE_ERROR) {
 		puts ("Vpp range error\n");
 		return ERR_PROG_ERROR;
 	}

 	/* check Device Protect Error, SR.1 */
 	if (code & BIT_PROTECT_ERROR) {
 		puts ("Device protect error\n");
 		return ERR_PROG_ERROR;
 	}

 	/* check Command Seq Error, SR.4 & SR.5 */
 	if (code & BIT_SEQUENCE_ERROR) {
 		puts ("Command seqence error\n");
 		return ERR_PROG_ERROR;
 	}

 	/* check Block Erase Error, SR.5 */
 	if (code & BIT_ERASE_ERROR) {
 		puts ("Block erase error\n");
 		return ERR_PROG_ERROR;
 	}

 	/* check Program Error, SR.4 */
 	if (code & BIT_PROGRAM_ERROR) {
 		puts ("Program error\n");
 		return ERR_PROG_ERROR;
 	}

 	/* check Block Erase Suspended, SR.6 */
 	if (code & BIT_ERASE_SUSPEND) {
 		puts ("Block erase suspended\n");
 		return ERR_PROG_ERROR;
 	}

 	/* check Program Suspended, SR.2 */
 	if (code & BIT_PROGRAM_SUSPEND) {
 		puts ("Program suspended\n");
 		return ERR_PROG_ERROR;
 	}

 	/* OK, no error */
 	return ERR_OK;
 }

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

 int flash_erase (flash_info_t * info, int s_first, int s_last)
 {
 	ulong result, result1;
 	int iflag, prot, sect;
 	int rc = ERR_OK;

 #ifdef USE_920T_MMU
 	int cflag;
 #endif

 	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;
 	}

 	if ((info->flash_id & FLASH_VENDMASK) !=
 		(INTEL_MANUFACT & FLASH_VENDMASK)) {
 		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.
 	 */
 #ifdef USE_920T_MMU
 	cflag = dcache_status ();
 	dcache_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]);
 			ulong bsR7, bsR7_2, bsR5, bsR5_2;

 			/* *addr = CMD_STATUS_RESET; */
 			*addr = CMD_ERASE_SETUP;
 			*addr = CMD_ERASE_CONFIRM;

 			/* wait until flash is ready */
 			do {
 				/* check timeout */
 				if (get_timer_masked () > CONFIG_SYS_FLASH_ERASE_TOUT) {
 					*addr = CMD_STATUS_RESET;
 					result = BIT_TIMEOUT;
 					break;
 				}

 				*addr = CMD_STATUS_READ;
 				result = *addr;
 				bsR7 = result & (1 << 7);
 				bsR7_2 = result & (1 << 23);
 			} while (!bsR7 | !bsR7_2);

 			*addr = CMD_STATUS_READ;
 			result1 = *addr;
 			bsR5 = result1 & (1 << 5);
 			bsR5_2 = result1 & (1 << 21);
 #ifdef SAMSUNG_FLASH_DEBUG
 			printf ("bsR5 %lx bsR5_2 %lx\n", bsR5, bsR5_2);
 			if (bsR5 != 0 && bsR5_2 != 0)
 				printf ("bsR5 %lx bsR5_2 %lx\n", bsR5, bsR5_2);
 #endif

 			*addr = CMD_READ_ARRAY;
 			*addr = CMD_RESUME;

 			if ((rc = flash_error (result)) != ERR_OK)
 				goto outahere;
 #if 0
 			printf ("ok.\n");
 		} else {		/* it was protected */

 			printf ("protected!\n");
 #endif
 		}
 	}

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

 	if (iflag)
 		enable_interrupts ();

 #ifdef USE_920T_MMU
 	if (cflag)
 		dcache_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;
 	int iflag;

 #ifdef USE_920T_MMU
 	int cflag;
 #endif

 	/*
 	 * 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.
 	 */
 #ifdef USE_920T_MMU
 	cflag = dcache_status ();
 	dcache_disable ();
 #endif
 	iflag = disable_interrupts ();

 	/* *addr = CMD_STATUS_RESET; */
 	*addr = CMD_PROGRAM;
 	*addr = data;

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

 	/* wait until flash is ready */
 	do {
 		/* check timeout */
 		if (get_timer_masked () > CONFIG_SYS_FLASH_ERASE_TOUT) {
 			*addr = CMD_SUSPEND;
 			result = BIT_TIMEOUT;
 			break;
 		}

 		*addr = CMD_STATUS_READ;
 		result = *addr;
 	} while (~result & BIT_BUSY);

 	/* *addr = CMD_READ_ARRAY; */
 	*addr = CMD_STATUS_READ;
 	result = *addr;

 	rc = flash_error (result);

 	if (iflag)
 		enable_interrupts ();

 #ifdef USE_920T_MMU
 	if (cflag)
 		dcache_enable ();
 #endif
 	*addr = CMD_READ_ARRAY;
 	*addr = CMD_RESUME;
 	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) {
 			return (rc);
 		}
 		wp += 4;
 	}

 	/*
 	 * handle word aligned part
 	 */
 	while (cnt >= 4) {
 		data = *((vu_long *) src);
 		if ((rc = write_word (info, wp, data)) != 0) {
 			return (rc);
 		}
 		src += 4;
 		wp += 4;
 		cnt -= 4;
 	}

 	if (cnt == 0) {
 		return ERR_OK;
 	}

 	/*
 	 * 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);
 	}

 	return write_word (info, wp, data);
 }
	/*
	* (C) Copyright 2002
	* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
	* Marius Groeger <mgroeger@sysgo.de>
	*
	* (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>

	#define FLASH_BANK_SIZE 0x1000000 /* 2 x 8 MB */
	#define MAIN_SECT_SIZE 0x40000 /* 2 x 128 kB */

	flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];


	#define CMD_READ_ARRAY 0x00FF00FF
	#define CMD_IDENTIFY 0x00900090
	#define CMD_ERASE_SETUP 0x00200020
	#define CMD_ERASE_CONFIRM 0x00D000D0
	#define CMD_PROGRAM 0x00400040
	#define CMD_RESUME 0x00D000D0
	#define CMD_SUSPEND 0x00B000B0
	#define CMD_STATUS_READ 0x00700070
	#define CMD_STATUS_RESET 0x00500050

	#define BIT_BUSY 0x00800080
	#define BIT_ERASE_SUSPEND 0x00400040
	#define BIT_ERASE_ERROR 0x00200020
	#define BIT_PROGRAM_ERROR 0x00100010
	#define BIT_VPP_RANGE_ERROR 0x00080008
	#define BIT_PROGRAM_SUSPEND 0x00040004
	#define BIT_PROTECT_ERROR 0x00020002
	#define BIT_UNDEFINED 0x00010001

	#define BIT_SEQUENCE_ERROR 0x00300030
	#define BIT_TIMEOUT 0x80000000

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

	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[i].flash_id =
	(INTEL_MANUFACT & FLASH_VENDMASK) \|
	(INTEL_ID_28F640J3A & FLASH_TYPEMASK);
	flash_info[i].size = FLASH_BANK_SIZE;
	flash_info[i].sector_count = CONFIG_SYS_MAX_FLASH_SECT;
	memset (flash_info[i].protect, 0, CONFIG_SYS_MAX_FLASH_SECT);
	if (i == 0)
	flashbase = CONFIG_SYS_FLASH_BASE;
	else
	panic ("configured too many flash banks!\n");
	for (j = 0; j < flash_info[i].sector_count; j++) {
	flash_info[i].start[j] = flashbase;

	/* uniform sector size */
	flashbase += MAIN_SECT_SIZE;
	}
	size += flash_info[i].size;
	}

	/*
	* 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 (INTEL_MANUFACT & FLASH_VENDMASK):
	printf ("Intel: ");
	break;
	default:
	printf ("Unknown Vendor ");
	break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case (INTEL_ID_28F640J3A & FLASH_TYPEMASK):
	printf ("2x 28F640J3A (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_error (ulong code)
	{
	/* Check bit patterns */
	/* SR.7=0 is busy, SR.7=1 is ready */
	/* all other flags indicate error on 1 */
	/* SR.0 is undefined */
	/* Timeout is our faked flag */

	/* sequence is described in Intel 290644-005 document */

	/* check Timeout */
	if (code & BIT_TIMEOUT) {
	puts ("Timeout\n");
	return ERR_TIMOUT;
	}

	/* check Busy, SR.7 */
	if (~code & BIT_BUSY) {
	puts ("Busy\n");
	return ERR_PROG_ERROR;
	}

	/* check Vpp low, SR.3 */
	if (code & BIT_VPP_RANGE_ERROR) {
	puts ("Vpp range error\n");
	return ERR_PROG_ERROR;
	}

	/* check Device Protect Error, SR.1 */
	if (code & BIT_PROTECT_ERROR) {
	puts ("Device protect error\n");
	return ERR_PROG_ERROR;
	}

	/* check Command Seq Error, SR.4 & SR.5 */
	if (code & BIT_SEQUENCE_ERROR) {
	puts ("Command seqence error\n");
	return ERR_PROG_ERROR;
	}

	/* check Block Erase Error, SR.5 */
	if (code & BIT_ERASE_ERROR) {
	puts ("Block erase error\n");
	return ERR_PROG_ERROR;
	}

	/* check Program Error, SR.4 */
	if (code & BIT_PROGRAM_ERROR) {
	puts ("Program error\n");
	return ERR_PROG_ERROR;
	}

	/* check Block Erase Suspended, SR.6 */
	if (code & BIT_ERASE_SUSPEND) {
	puts ("Block erase suspended\n");
	return ERR_PROG_ERROR;
	}

	/* check Program Suspended, SR.2 */
	if (code & BIT_PROGRAM_SUSPEND) {
	puts ("Program suspended\n");
	return ERR_PROG_ERROR;
	}

	/* OK, no error */
	return ERR_OK;
	}

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

	int flash_erase (flash_info_t * info, int s_first, int s_last)
	{
	ulong result, result1;
	int iflag, prot, sect;
	int rc = ERR_OK;

	#ifdef USE_920T_MMU
	int cflag;
	#endif

	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;
	}

	if ((info->flash_id & FLASH_VENDMASK) !=
	(INTEL_MANUFACT & FLASH_VENDMASK)) {
	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.
	*/
	#ifdef USE_920T_MMU
	cflag = dcache_status ();
	dcache_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]);
	ulong bsR7, bsR7_2, bsR5, bsR5_2;

	/* addr = CMD_STATUS_RESET; /
	*addr = CMD_ERASE_SETUP;
	*addr = CMD_ERASE_CONFIRM;

	/* wait until flash is ready */
	do {
	/* check timeout */
	if (get_timer_masked () > CONFIG_SYS_FLASH_ERASE_TOUT) {
	*addr = CMD_STATUS_RESET;
	result = BIT_TIMEOUT;
	break;
	}

	*addr = CMD_STATUS_READ;
	result = *addr;
	bsR7 = result & (1 << 7);
	bsR7_2 = result & (1 << 23);
	} while (!bsR7 \| !bsR7_2);

	*addr = CMD_STATUS_READ;
	result1 = *addr;
	bsR5 = result1 & (1 << 5);
	bsR5_2 = result1 & (1 << 21);
	#ifdef SAMSUNG_FLASH_DEBUG
	printf ("bsR5 %lx bsR5_2 %lx\n", bsR5, bsR5_2);
	if (bsR5 != 0 && bsR5_2 != 0)
	printf ("bsR5 %lx bsR5_2 %lx\n", bsR5, bsR5_2);
	#endif

	*addr = CMD_READ_ARRAY;
	*addr = CMD_RESUME;

	if ((rc = flash_error (result)) != ERR_OK)
	goto outahere;
	#if 0
	printf ("ok.\n");
	} else { /* it was protected */

	printf ("protected!\n");
	#endif
	}
	}

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

	if (iflag)
	enable_interrupts ();

	#ifdef USE_920T_MMU
	if (cflag)
	dcache_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;
	int iflag;

	#ifdef USE_920T_MMU
	int cflag;
	#endif

	/*
	* 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.
	*/
	#ifdef USE_920T_MMU
	cflag = dcache_status ();
	dcache_disable ();
	#endif
	iflag = disable_interrupts ();

	/* addr = CMD_STATUS_RESET; /
	*addr = CMD_PROGRAM;
	*addr = data;

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

	/* wait until flash is ready */
	do {
	/* check timeout */
	if (get_timer_masked () > CONFIG_SYS_FLASH_ERASE_TOUT) {
	*addr = CMD_SUSPEND;
	result = BIT_TIMEOUT;
	break;
	}

	*addr = CMD_STATUS_READ;
	result = *addr;
	} while (~result & BIT_BUSY);

	/* addr = CMD_READ_ARRAY; /
	*addr = CMD_STATUS_READ;
	result = *addr;

	rc = flash_error (result);

	if (iflag)
	enable_interrupts ();

	#ifdef USE_920T_MMU
	if (cflag)
	dcache_enable ();
	#endif
	*addr = CMD_READ_ARRAY;
	*addr = CMD_RESUME;
	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) {
	return (rc);
	}
	wp += 4;
	}

	/*
	* handle word aligned part
	*/
	while (cnt >= 4) {
	data = ((vu_long ) src);
	if ((rc = write_word (info, wp, data)) != 0) {
	return (rc);
	}
	src += 4;
	wp += 4;
	cnt -= 4;
	}

	if (cnt == 0) {
	return ERR_OK;
	}

	/*
	* 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);
	}

	return write_word (info, wp, data);
	}