[people/ms/u-boot.git] / board / tqm8xx / flash.c

/*
 * (C) Copyright 2000-2002
 * 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., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

/* #define DEBUG */

#include <common.h>
#include <mpc8xx.h>
#include <environment.h>

#ifndef	CFG_ENV_ADDR
#define CFG_ENV_ADDR	(CFG_FLASH_BASE + CFG_ENV_OFFSET)
#endif

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

/*-----------------------------------------------------------------------
 * Functions
 */
static ulong flash_get_size (vu_long *addr, flash_info_t *info);
static int write_word (flash_info_t *info, ulong dest, ulong data);

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

unsigned long flash_init (void)
{
	volatile immap_t     *immap  = (immap_t *)CFG_IMMR;
	volatile memctl8xx_t *memctl = &immap->im_memctl;
	unsigned long size_b0, size_b1;
	int i;

	/* Init: no FLASHes known */
	for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
		flash_info[i].flash_id = FLASH_UNKNOWN;
	}

	/* Static FLASH Bank configuration here - FIXME XXX */

	debug ("\n## Get flash bank 1 size @ 0x%08x\n",FLASH_BASE0_PRELIM);

	size_b0 = flash_get_size((vu_long *)FLASH_BASE0_PRELIM, &flash_info[0]);

	debug ("## Get flash bank 2 size @ 0x%08x\n",FLASH_BASE1_PRELIM);

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

	size_b1 = flash_get_size((vu_long *)FLASH_BASE1_PRELIM, &flash_info[1]);

	debug ("## Prelim. Flash bank sizes: %08lx + 0x%08lx\n",size_b0,size_b1);

	if (size_b1 > size_b0) {
		printf ("## ERROR: "
			"Bank 1 (0x%08lx = %ld MB) > Bank 0 (0x%08lx = %ld MB)\n",
			size_b1, size_b1<<20,
			size_b0, size_b0<<20
		);
		flash_info[0].flash_id	= FLASH_UNKNOWN;
		flash_info[1].flash_id	= FLASH_UNKNOWN;
		flash_info[0].sector_count	= -1;
		flash_info[1].sector_count	= -1;
		flash_info[0].size		= 0;
		flash_info[1].size		= 0;
		return (0);
	}

	debug  ("## Before remap: "
		"BR0: 0x%08x    OR0: 0x%08x    "
		"BR1: 0x%08x    OR1: 0x%08x\n",
		memctl->memc_br0, memctl->memc_or0,
		memctl->memc_br1, memctl->memc_or1);

	/* Remap FLASH according to real size */
	memctl->memc_or0 = CFG_OR_TIMING_FLASH | (-size_b0 & OR_AM_MSK);
	memctl->memc_br0 = (CFG_FLASH_BASE & BR_BA_MSK) | BR_MS_GPCM | BR_V;

	debug ("## BR0: 0x%08x    OR0: 0x%08x\n",
		memctl->memc_br0, memctl->memc_or0);

	/* Re-do sizing to get full correct info */
	size_b0 = flash_get_size((vu_long *)CFG_FLASH_BASE, &flash_info[0]);

#if CFG_MONITOR_BASE >= CFG_FLASH_BASE
	/* monitor protection ON by default */
	debug ("Protect monitor: %08lx ... %08lx\n",
		(ulong)CFG_MONITOR_BASE,
		(ulong)CFG_MONITOR_BASE + monitor_flash_len - 1);

	flash_protect(FLAG_PROTECT_SET,
		      CFG_MONITOR_BASE,
		      CFG_MONITOR_BASE + monitor_flash_len - 1,
		      &flash_info[0]);
#endif

#ifdef	CFG_ENV_IS_IN_FLASH
	/* ENV protection ON by default */
	debug ("Protect %senvironment: %08lx ... %08lx\n",
# ifdef CFG_ENV_ADDR_REDUND
		"primary   ",
# else
		"",
# endif
		(ulong)CFG_ENV_ADDR,
		(ulong)CFG_ENV_ADDR + CFG_ENV_SECT_SIZE - 1);

	flash_protect(FLAG_PROTECT_SET,
		      CFG_ENV_ADDR,
		      CFG_ENV_ADDR + CFG_ENV_SECT_SIZE - 1,
		      &flash_info[0]);
#endif

#ifdef CFG_ENV_ADDR_REDUND
	debug ("Protect redundand environment: %08lx ... %08lx\n",
		(ulong)CFG_ENV_ADDR_REDUND,
		(ulong)CFG_ENV_ADDR_REDUND + CFG_ENV_SECT_SIZE - 1);

	flash_protect(FLAG_PROTECT_SET,
		      CFG_ENV_ADDR_REDUND,
		      CFG_ENV_ADDR_REDUND + CFG_ENV_SECT_SIZE - 1,
		      &flash_info[0]);
#endif

	if (size_b1) {
		memctl->memc_or1 = CFG_OR_TIMING_FLASH | (-size_b1 & 0xFFFF8000);
		memctl->memc_br1 = ((CFG_FLASH_BASE + size_b0) & BR_BA_MSK) |
				    BR_MS_GPCM | BR_V;

		debug ("## BR1: 0x%08x    OR1: 0x%08x\n",
			memctl->memc_br1, memctl->memc_or1);

		/* Re-do sizing to get full correct info */
		size_b1 = flash_get_size((vu_long *)(CFG_FLASH_BASE + size_b0),
					  &flash_info[1]);

#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_info[1]);
#endif

#ifdef	CFG_ENV_IS_IN_FLASH
		/* ENV protection ON by default */
		flash_protect(FLAG_PROTECT_SET,
			      CFG_ENV_ADDR,
			      CFG_ENV_ADDR+CFG_ENV_SIZE-1,
			      &flash_info[1]);
#endif
	} else {
		memctl->memc_br1 = 0;		/* invalidate bank */

		flash_info[1].flash_id = FLASH_UNKNOWN;
		flash_info[1].sector_count = -1;
		flash_info[1].size = 0;

		debug ("## DISABLE BR1: 0x%08x    OR1: 0x%08x\n",
			memctl->memc_br1, memctl->memc_or1);
	}

	debug ("## Final Flash bank sizes: %08lx + 0x%08lx\n",size_b0,size_b1);

	flash_info[0].size = size_b0;
	flash_info[1].size = size_b1;

	return (size_b0 + size_b1);
}

/*-----------------------------------------------------------------------
 */
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 & FLASH_VENDMASK) {
	case FLASH_MAN_AMD:	printf ("AMD ");		break;
	case FLASH_MAN_FUJ:	printf ("FUJITSU ");		break;
	default:		printf ("Unknown Vendor ");	break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
#ifdef CONFIG_TQM8xxM	/* mirror bit flash */
	case FLASH_AMLV128U:	printf ("AM29LV128ML (128Mbit, uniform sector size)\n");
				break;
	case FLASH_AMLV320U:	printf ("AM29LV320ML (32Mbit, uniform sector size)\n");
				break;
	case FLASH_AMLV640U:	printf ("AM29LV640ML (64Mbit, uniform sector size)\n");
				break;
# else	/* ! TQM8xxM */
	case FLASH_AM400B:	printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
				break;
	case FLASH_AM400T:	printf ("AM29LV400T (4 Mbit, top boot sector)\n");
				break;
	case FLASH_AM800B:	printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
				break;
	case FLASH_AM800T:	printf ("AM29LV800T (8 Mbit, top boot sector)\n");
				break;
	case FLASH_AM320B:	printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
				break;
	case FLASH_AM320T:	printf ("AM29LV320T (32 Mbit, top boot sector)\n");
				break;
#endif	/* TQM8xxM */
	case FLASH_AM160B:	printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
				break;
	case FLASH_AM160T:	printf ("AM29LV160T (16 Mbit, top boot sector)\n");
				break;
	default:		printf ("Unknown Chip Type\n");
				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");
	return;
}

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


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

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

static ulong flash_get_size (vu_long *addr, flash_info_t *info)
{
	short i;
	ulong value;
	ulong base = (ulong)addr;

	/* Write auto select command: read Manufacturer ID */
	addr[0x0555] = 0x00AA00AA;
	addr[0x02AA] = 0x00550055;
	addr[0x0555] = 0x00900090;

	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;
	default:
		info->flash_id = FLASH_UNKNOWN;
		info->sector_count = 0;
		info->size = 0;
		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) {
#ifdef CONFIG_TQM8xxM	/* mirror bit flash */
	case AMD_ID_MIRROR:
		/* Special case for AMLV320MH/L */
		if ((addr[14] & 0x00ff00ff) == 0x001d001d &&
			(addr[15] & 0x00ff00ff) == 0x00000000) {
			info->flash_id += FLASH_AMLV320U;
			info->sector_count = 64;
			info->size = 0x00800000; /* => 8 MB */
			break;
		} 
		switch(addr[14]) {
		case AMD_ID_LV128U_2:
			if (addr[15] != AMD_ID_LV128U_3) {
				info->flash_id = FLASH_UNKNOWN;
			}
			else {
				info->flash_id += FLASH_AMLV128U;
				info->sector_count = 256;
				info->size = 0x02000000;
			}
			break;				/* => 32 MB		*/
		case AMD_ID_LV640U_2:
			if (addr[15] != AMD_ID_LV640U_3) {
				info->flash_id = FLASH_UNKNOWN;
			}
			else {
				info->flash_id += FLASH_AMLV640U;
				info->sector_count = 128;
				info->size = 0x01000000;
			}
			break;				/* => 16 MB		*/
		default:
			info->flash_id = FLASH_UNKNOWN;
			break;
		}
		break;
# else	/* ! TQM8xxM */
	case AMD_ID_LV400T:
		info->flash_id += FLASH_AM400T;
		info->sector_count = 11;
		info->size = 0x00100000;
		break;				/* => 1 MB		*/

	case AMD_ID_LV400B:
		info->flash_id += FLASH_AM400B;
		info->sector_count = 11;
		info->size = 0x00100000;
		break;				/* => 1 MB		*/

	case AMD_ID_LV800T:
		info->flash_id += FLASH_AM800T;
		info->sector_count = 19;
		info->size = 0x00200000;
		break;				/* => 2 MB		*/

	case AMD_ID_LV800B:
		info->flash_id += FLASH_AM800B;
		info->sector_count = 19;
		info->size = 0x00200000;
		break;				/* => 2 MB		*/

	case AMD_ID_LV320T:
		info->flash_id += FLASH_AM320T;
		info->sector_count = 71;
		info->size = 0x00800000;
		break;				/* => 8 MB		*/

	case AMD_ID_LV320B:
		info->flash_id += FLASH_AM320B;
		info->sector_count = 71;
		info->size = 0x00800000;
		break;				/* => 8 MB		*/
#endif	/* TQM8xxM */

	case AMD_ID_LV160T:
		info->flash_id += FLASH_AM160T;
		info->sector_count = 35;
		info->size = 0x00400000;
		break;				/* => 4 MB		*/

	case AMD_ID_LV160B:
		info->flash_id += FLASH_AM160B;
		info->sector_count = 35;
		info->size = 0x00400000;
		break;				/* => 4 MB		*/

	default:
		info->flash_id = FLASH_UNKNOWN;
		return (0);			/* => no or unknown flash */
	}

	/* set up sector start address table */
	switch (value) {
#ifdef CONFIG_TQM8xxM	/* mirror bit flash */
	case AMD_ID_MIRROR:
		switch (info->flash_id & FLASH_TYPEMASK) {
			/* only known types here - no default */
		case FLASH_AMLV128U:
		case FLASH_AMLV640U:
		case FLASH_AMLV320U:
			for (i = 0; i < info->sector_count; i++) {
				info->start[i] = base;
				base += 0x20000;
			}
			break;
		}
		break;
# else	/* ! TQM8xxM */
	case AMD_ID_LV400B:
	case AMD_ID_LV800B:
		/* set sector offsets for bottom boot block type	*/
		info->start[0] = base + 0x00000000;
		info->start[1] = base + 0x00008000;
		info->start[2] = base + 0x0000C000;
		info->start[3] = base + 0x00010000;
		for (i = 4; i < info->sector_count; i++) {
			info->start[i] = base + (i * 0x00020000) - 0x00060000;
		}
		break;
	case AMD_ID_LV400T:
	case AMD_ID_LV800T:
		/* set sector offsets for top boot block type		*/
		i = info->sector_count - 1;
		info->start[i--] = base + info->size - 0x00008000;
		info->start[i--] = base + info->size - 0x0000C000;
		info->start[i--] = base + info->size - 0x00010000;
		for (; i >= 0; i--) {
			info->start[i] = base + i * 0x00020000;
		}
		break;
	case AMD_ID_LV320B:
		for (i = 0; i < info->sector_count; i++) {
			info->start[i] = base;
			/*
			 * The first 8 sectors are 8 kB,
			 * all the other ones  are 64 kB
			 */
			base += (i < 8)
				?  2 * ( 8 << 10)
				:  2 * (64 << 10);
		}
		break;
	case AMD_ID_LV320T:
		for (i = 0; i < info->sector_count; i++) {
			info->start[i] = base;
			/*
			 * The last 8 sectors are 8 kB,
			 * all the other ones  are 64 kB
			 */
			base += (i < (info->sector_count - 8))
				?  2 * (64 << 10)
				:  2 * ( 8 << 10);
		}
		break;
#endif	/* TQM8xxM */
	case AMD_ID_LV160B:
		/* set sector offsets for bottom boot block type	*/
		info->start[0] = base + 0x00000000;
		info->start[1] = base + 0x00008000;
		info->start[2] = base + 0x0000C000;
		info->start[3] = base + 0x00010000;
		for (i = 4; i < info->sector_count; i++) {
			info->start[i] = base + (i * 0x00020000) - 0x00060000;
		}
		break;
	case AMD_ID_LV160T:
		/* set sector offsets for top boot block type		*/
		i = info->sector_count - 1;
		info->start[i--] = base + info->size - 0x00008000;
		info->start[i--] = base + info->size - 0x0000C000;
		info->start[i--] = base + info->size - 0x00010000;
		for (; i >= 0; i--) {
			info->start[i] = base + i * 0x00020000;
		}
		break;
	default:
		return (0);
		break;
	}

	/* check for protected sectors */
	for (i = 0; i < info->sector_count; i++) {
		/* read sector protection at sector address, (A7 .. A0) = 0x02 */
		/* D0 = 1 if protected */
		addr = (volatile unsigned long *)(info->start[i]);
		info->protect[i] = addr[2] & 1;
	}

	/*
	 * Prevent writes to uninitialized FLASH.
	 */
	if (info->flash_id != FLASH_UNKNOWN) {
		addr = (volatile unsigned long *)info->start[0];

		*addr = 0x00F000F0;	/* reset bank */
	}

	return (info->size);
}


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

int	flash_erase (flash_info_t *info, int s_first, int s_last)
{
	vu_long *addr = (vu_long*)(info->start[0]);
	int flag, prot, sect, l_sect;
	ulong start, now, last;

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

	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;
	}

	if ((info->flash_id == FLASH_UNKNOWN) ||
	    (info->flash_id > FLASH_AMD_COMP)) {
		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");
	}

	l_sect = -1;

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

	addr[0x0555] = 0x00AA00AA;
	addr[0x02AA] = 0x00550055;
	addr[0x0555] = 0x00800080;
	addr[0x0555] = 0x00AA00AA;
	addr[0x02AA] = 0x00550055;

	/* Start erase on unprotected sectors */
	for (sect = s_first; sect<=s_last; sect++) {
		if (info->protect[sect] == 0) {	/* not protected */
			addr = (vu_long*)(info->start[sect]);
			addr[0] = 0x00300030;
			l_sect = sect;
		}
	}

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

	/* wait at least 80us - let's wait 1 ms */
	udelay (1000);

	/*
	 * We wait for the last triggered sector
	 */
	if (l_sect < 0)
		goto DONE;

	start = get_timer (0);
	last  = start;
	addr = (vu_long*)(info->start[l_sect]);
	while ((addr[0] & 0x00800080) != 0x00800080) {
		if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
			printf ("Timeout\n");
			return 1;
		}
		/* show that we're waiting */
		if ((now - last) > 1000) {	/* every second */
			putc ('.');
			last = now;
		}
	}

DONE:
	/* reset to read mode */
	addr = (volatile unsigned long *)info->start[0];
	addr[0] = 0x00F000F0;	/* reset bank */

	printf (" done\n");
	return 0;
}

/*-----------------------------------------------------------------------
 * 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)
{
	ulong cp, wp, data;
	int i, l, 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);
		}
		for (; i<4 && cnt>0; ++i) {
			data = (data << 8) | *src++;
			--cnt;
			++cp;
		}
		for (; cnt==0 && i<4; ++i, ++cp) {
			data = (data << 8) | (*(uchar *)cp);
		}

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

	/*
	 * handle word aligned part
	 */
	while (cnt >= 4) {
		data = 0;
		for (i=0; i<4; ++i) {
			data = (data << 8) | *src++;
		}
		if ((rc = write_word(info, wp, data)) != 0) {
			return (rc);
		}
		wp  += 4;
		cnt -= 4;
	}

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

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

	return (write_word(info, wp, data));
}

/*-----------------------------------------------------------------------
 * Write a word to Flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 */
static int write_word (flash_info_t *info, ulong dest, ulong data)
{
	vu_long *addr = (vu_long*)(info->start[0]);
	ulong start;
	int flag;

	/* Check if Flash is (sufficiently) erased */
	if ((*((vu_long *)dest) & data) != data) {
		return (2);
	}
	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts();

	addr[0x0555] = 0x00AA00AA;
	addr[0x02AA] = 0x00550055;
	addr[0x0555] = 0x00A000A0;

	*((vu_long *)dest) = data;

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

	/* data polling for D7 */
	start = get_timer (0);
	while ((*((vu_long *)dest) & 0x00800080) != (data & 0x00800080)) {
		if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
			return (1);
		}
	}
	return (0);
}

/*-----------------------------------------------------------------------
 */
Commit	Line	Data
c609719b WD	1	/*
	2	* (C) Copyright 2000-2002
	3	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	4	*
	5	* See file CREDITS for list of people who contributed to this
	6	* project.
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License as
	10	* published by the Free Software Foundation; either version 2 of
	11	* the License, or (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	21	* MA 02111-1307 USA
	22	*/
	23
73a8b27c WD	24	/* #define DEBUG */
73a8b27c WD	25
c609719b WD	26	#include <common.h>
c609719b WD	27	#include <mpc8xx.h>
71f95118	28	#include <environment.h>
c609719b WD	29
	30	#ifndef CFG_ENV_ADDR
	31	#define CFG_ENV_ADDR (CFG_FLASH_BASE + CFG_ENV_OFFSET)
	32	#endif
	33
	34	flash_info_t flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips */
	35
	36	/*-----------------------------------------------------------------------
	37	* Functions
	38	*/
	39	static ulong flash_get_size (vu_long addr, flash_info_t info);
	40	static int write_word (flash_info_t *info, ulong dest, ulong data);
	41
	42	/*-----------------------------------------------------------------------
	43	*/
	44
	45	unsigned long flash_init (void)
	46	{
	47	volatile immap_t immap = (immap_t )CFG_IMMR;
	48	volatile memctl8xx_t *memctl = &immap->im_memctl;
	49	unsigned long size_b0, size_b1;
	50	int i;
	51
	52	/* Init: no FLASHes known */
	53	for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
	54	flash_info[i].flash_id = FLASH_UNKNOWN;
	55	}
	56
	57	/* Static FLASH Bank configuration here - FIXME XXX */
	58
73a8b27c WD	59	debug ("\n## Get flash bank 1 size @ 0x%08x\n",FLASH_BASE0_PRELIM);
73a8b27c WD	60
c609719b WD	61	size_b0 = flash_get_size((vu_long *)FLASH_BASE0_PRELIM, &flash_info[0]);
c609719b WD	62
73a8b27c WD	63	debug ("## Get flash bank 2 size @ 0x%08x\n",FLASH_BASE1_PRELIM);
73a8b27c WD	64
c609719b WD	65	if (flash_info[0].flash_id == FLASH_UNKNOWN) {
	66	printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
	67	size_b0, size_b0<<20);
	68	}
	69
	70	size_b1 = flash_get_size((vu_long *)FLASH_BASE1_PRELIM, &flash_info[1]);
	71
73a8b27c WD	72	debug ("## Prelim. Flash bank sizes: %08lx + 0x%08lx\n",size_b0,size_b1);
73a8b27c WD	73
c609719b WD	74	if (size_b1 > size_b0) {
	75	printf ("## ERROR: "
	76	"Bank 1 (0x%08lx = %ld MB) > Bank 0 (0x%08lx = %ld MB)\n",
	77	size_b1, size_b1<<20,
	78	size_b0, size_b0<<20
	79	);
	80	flash_info[0].flash_id = FLASH_UNKNOWN;
	81	flash_info[1].flash_id = FLASH_UNKNOWN;
	82	flash_info[0].sector_count = -1;
	83	flash_info[1].sector_count = -1;
	84	flash_info[0].size = 0;
	85	flash_info[1].size = 0;
	86	return (0);
	87	}
	88
73a8b27c WD	89	debug ("## Before remap: "
	90	"BR0: 0x%08x OR0: 0x%08x "
	91	"BR1: 0x%08x OR1: 0x%08x\n",
	92	memctl->memc_br0, memctl->memc_or0,
	93	memctl->memc_br1, memctl->memc_or1);
	94
c609719b WD	95	/* Remap FLASH according to real size */
	96	memctl->memc_or0 = CFG_OR_TIMING_FLASH \| (-size_b0 & OR_AM_MSK);
	97	memctl->memc_br0 = (CFG_FLASH_BASE & BR_BA_MSK) \| BR_MS_GPCM \| BR_V;
	98
73a8b27c WD	99	debug ("## BR0: 0x%08x OR0: 0x%08x\n",
	100	memctl->memc_br0, memctl->memc_or0);
	101
c609719b WD	102	/* Re-do sizing to get full correct info */
	103	size_b0 = flash_get_size((vu_long *)CFG_FLASH_BASE, &flash_info[0]);
	104
	105	#if CFG_MONITOR_BASE >= CFG_FLASH_BASE
	106	/* monitor protection ON by default */
71f95118 WD	107	debug ("Protect monitor: %08lx ... %08lx\n",
	108	(ulong)CFG_MONITOR_BASE,
	109	(ulong)CFG_MONITOR_BASE + monitor_flash_len - 1);
	110
c609719b WD	111	flash_protect(FLAG_PROTECT_SET,
c609719b WD	112	CFG_MONITOR_BASE,
71f95118	113	CFG_MONITOR_BASE + monitor_flash_len - 1,
c609719b WD	114	&flash_info[0]);
	115	#endif
	116
	117	#ifdef CFG_ENV_IS_IN_FLASH
	118	/* ENV protection ON by default */
71f95118 WD	119	debug ("Protect %senvironment: %08lx ... %08lx\n",
	120	# ifdef CFG_ENV_ADDR_REDUND
	121	"primary ",
	122	# else
	123	"",
	124	# endif
	125	(ulong)CFG_ENV_ADDR,
	126	(ulong)CFG_ENV_ADDR + CFG_ENV_SECT_SIZE - 1);
	127
c609719b WD	128	flash_protect(FLAG_PROTECT_SET,
c609719b WD	129	CFG_ENV_ADDR,
71f95118 WD	130	CFG_ENV_ADDR + CFG_ENV_SECT_SIZE - 1,
	131	&flash_info[0]);
	132	#endif
	133
	134	#ifdef CFG_ENV_ADDR_REDUND
	135	debug ("Protect redundand environment: %08lx ... %08lx\n",
	136	(ulong)CFG_ENV_ADDR_REDUND,
	137	(ulong)CFG_ENV_ADDR_REDUND + CFG_ENV_SECT_SIZE - 1);
	138
	139	flash_protect(FLAG_PROTECT_SET,
	140	CFG_ENV_ADDR_REDUND,
	141	CFG_ENV_ADDR_REDUND + CFG_ENV_SECT_SIZE - 1,
c609719b WD	142	&flash_info[0]);
	143	#endif
	144
	145	if (size_b1) {
	146	memctl->memc_or1 = CFG_OR_TIMING_FLASH \| (-size_b1 & 0xFFFF8000);
	147	memctl->memc_br1 = ((CFG_FLASH_BASE + size_b0) & BR_BA_MSK) \|
	148	BR_MS_GPCM \| BR_V;
	149
73a8b27c WD	150	debug ("## BR1: 0x%08x OR1: 0x%08x\n",
	151	memctl->memc_br1, memctl->memc_or1);
	152
c609719b WD	153	/* Re-do sizing to get full correct info */
	154	size_b1 = flash_get_size((vu_long *)(CFG_FLASH_BASE + size_b0),
	155	&flash_info[1]);
	156
	157	#if CFG_MONITOR_BASE >= CFG_FLASH_BASE
	158	/* monitor protection ON by default */
	159	flash_protect(FLAG_PROTECT_SET,
	160	CFG_MONITOR_BASE,
3b57fe0a	161	CFG_MONITOR_BASE+monitor_flash_len-1,
c609719b WD	162	&flash_info[1]);
	163	#endif
	164
	165	#ifdef CFG_ENV_IS_IN_FLASH
	166	/* ENV protection ON by default */
	167	flash_protect(FLAG_PROTECT_SET,
	168	CFG_ENV_ADDR,
	169	CFG_ENV_ADDR+CFG_ENV_SIZE-1,
	170	&flash_info[1]);
	171	#endif
	172	} else {
	173	memctl->memc_br1 = 0; /* invalidate bank */
	174
	175	flash_info[1].flash_id = FLASH_UNKNOWN;
	176	flash_info[1].sector_count = -1;
73a8b27c WD	177	flash_info[1].size = 0;
	178
	179	debug ("## DISABLE BR1: 0x%08x OR1: 0x%08x\n",
	180	memctl->memc_br1, memctl->memc_or1);
c609719b WD	181	}
c609719b WD	182
73a8b27c WD	183	debug ("## Final Flash bank sizes: %08lx + 0x%08lx\n",size_b0,size_b1);
73a8b27c WD	184
c609719b WD	185	flash_info[0].size = size_b0;
	186	flash_info[1].size = size_b1;
	187
	188	return (size_b0 + size_b1);
	189	}
	190
	191	/*-----------------------------------------------------------------------
	192	*/
	193	void flash_print_info (flash_info_t *info)
	194	{
	195	int i;
	196
	197	if (info->flash_id == FLASH_UNKNOWN) {
	198	printf ("missing or unknown FLASH type\n");
	199	return;
	200	}
	201
	202	switch (info->flash_id & FLASH_VENDMASK) {
	203	case FLASH_MAN_AMD: printf ("AMD "); break;
	204	case FLASH_MAN_FUJ: printf ("FUJITSU "); break;
	205	default: printf ("Unknown Vendor "); break;
	206	}
	207
	208	switch (info->flash_id & FLASH_TYPEMASK) {
71f95118 WD	209	#ifdef CONFIG_TQM8xxM /* mirror bit flash */
	210	case FLASH_AMLV128U: printf ("AM29LV128ML (128Mbit, uniform sector size)\n");
	211	break;
f12e568c WD	212	case FLASH_AMLV320U: printf ("AM29LV320ML (32Mbit, uniform sector size)\n");
	213	break;
	214	case FLASH_AMLV640U: printf ("AM29LV640ML (64Mbit, uniform sector size)\n");
	215	break;
71f95118	216	# else /* ! TQM8xxM */
c609719b WD	217	case FLASH_AM400B: printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
	218	break;
	219	case FLASH_AM400T: printf ("AM29LV400T (4 Mbit, top boot sector)\n");
	220	break;
	221	case FLASH_AM800B: printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
	222	break;
	223	case FLASH_AM800T: printf ("AM29LV800T (8 Mbit, top boot sector)\n");
	224	break;
c609719b WD	225	case FLASH_AM320B: printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
	226	break;
	227	case FLASH_AM320T: printf ("AM29LV320T (32 Mbit, top boot sector)\n");
	228	break;
71f95118	229	#endif /* TQM8xxM */
f12e568c WD	230	case FLASH_AM160B: printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
	231	break;
	232	case FLASH_AM160T: printf ("AM29LV160T (16 Mbit, top boot sector)\n");
	233	break;
c609719b WD	234	default: printf ("Unknown Chip Type\n");
	235	break;
	236	}
	237
	238	printf (" Size: %ld MB in %d Sectors\n",
	239	info->size >> 20, info->sector_count);
	240
	241	printf (" Sector Start Addresses:");
	242	for (i=0; i<info->sector_count; ++i) {
	243	if ((i % 5) == 0)
	244	printf ("\n ");
	245	printf (" %08lX%s",
	246	info->start[i],
	247	info->protect[i] ? " (RO)" : " "
	248	);
	249	}
	250	printf ("\n");
	251	return;
	252	}
	253
	254	/*-----------------------------------------------------------------------
	255	*/
	256
	257
	258	/*-----------------------------------------------------------------------
	259	*/
	260
	261	/*
	262	* The following code cannot be run from FLASH!
	263	*/
	264
	265	static ulong flash_get_size (vu_long addr, flash_info_t info)
	266	{
	267	short i;
	268	ulong value;
	269	ulong base = (ulong)addr;
	270
	271	/* Write auto select command: read Manufacturer ID */
	272	addr[0x0555] = 0x00AA00AA;
	273	addr[0x02AA] = 0x00550055;
	274	addr[0x0555] = 0x00900090;
	275
	276	value = addr[0];
	277
73a8b27c WD	278	debug ("Manuf. ID @ 0x%08lx: 0x%08lx\n", (ulong)addr, value);
73a8b27c WD	279
c609719b WD	280	switch (value) {
	281	case AMD_MANUFACT:
	282	info->flash_id = FLASH_MAN_AMD;
	283	break;
	284	case FUJ_MANUFACT:
	285	info->flash_id = FLASH_MAN_FUJ;
	286	break;
	287	default:
	288	info->flash_id = FLASH_UNKNOWN;
	289	info->sector_count = 0;
	290	info->size = 0;
	291	return (0); /* no or unknown flash */
	292	}
	293
	294	value = addr[1]; /* device ID */
	295
73a8b27c WD	296	debug ("Device ID @ 0x%08lx: 0x%08lx\n", (ulong)(&addr[1]), value);
73a8b27c WD	297
c609719b	298	switch (value) {
71f95118 WD	299	#ifdef CONFIG_TQM8xxM /* mirror bit flash */
71f95118 WD	300	case AMD_ID_MIRROR:
f12e568c WD	301	/* Special case for AMLV320MH/L */
	302	if ((addr[14] & 0x00ff00ff) == 0x001d001d &&
	303	(addr[15] & 0x00ff00ff) == 0x00000000) {
	304	info->flash_id += FLASH_AMLV320U;
	305	info->sector_count = 64;
	306	info->size = 0x00800000; /* => 8 MB */
	307	break;
	308	}
71f95118 WD	309	switch(addr[14]) {
	310	case AMD_ID_LV128U_2:
	311	if (addr[15] != AMD_ID_LV128U_3) {
	312	info->flash_id = FLASH_UNKNOWN;
	313	}
	314	else {
	315	info->flash_id += FLASH_AMLV128U;
	316	info->sector_count = 256;
	317	info->size = 0x02000000;
	318	}
	319	break; /* => 32 MB */
f12e568c WD	320	case AMD_ID_LV640U_2:
	321	if (addr[15] != AMD_ID_LV640U_3) {
	322	info->flash_id = FLASH_UNKNOWN;
	323	}
	324	else {
	325	info->flash_id += FLASH_AMLV640U;
	326	info->sector_count = 128;
	327	info->size = 0x01000000;
	328	}
	329	break; /* => 16 MB */
71f95118 WD	330	default:
	331	info->flash_id = FLASH_UNKNOWN;
	332	break;
	333	}
	334	break;
	335	# else /* ! TQM8xxM */
c609719b WD	336	case AMD_ID_LV400T:
	337	info->flash_id += FLASH_AM400T;
	338	info->sector_count = 11;
	339	info->size = 0x00100000;
	340	break; /* => 1 MB */
	341
	342	case AMD_ID_LV400B:
	343	info->flash_id += FLASH_AM400B;
	344	info->sector_count = 11;
	345	info->size = 0x00100000;
	346	break; /* => 1 MB */
	347
	348	case AMD_ID_LV800T:
	349	info->flash_id += FLASH_AM800T;
	350	info->sector_count = 19;
	351	info->size = 0x00200000;
	352	break; /* => 2 MB */
	353
	354	case AMD_ID_LV800B:
	355	info->flash_id += FLASH_AM800B;
	356	info->sector_count = 19;
	357	info->size = 0x00200000;
	358	break; /* => 2 MB */
	359
c609719b WD	360	case AMD_ID_LV320T:
	361	info->flash_id += FLASH_AM320T;
	362	info->sector_count = 71;
	363	info->size = 0x00800000;
	364	break; /* => 8 MB */
	365
	366	case AMD_ID_LV320B:
	367	info->flash_id += FLASH_AM320B;
	368	info->sector_count = 71;
	369	info->size = 0x00800000;
	370	break; /* => 8 MB */
71f95118	371	#endif /* TQM8xxM */
f12e568c WD	372
	373	case AMD_ID_LV160T:
	374	info->flash_id += FLASH_AM160T;
	375	info->sector_count = 35;
	376	info->size = 0x00400000;
	377	break; /* => 4 MB */
	378
	379	case AMD_ID_LV160B:
	380	info->flash_id += FLASH_AM160B;
	381	info->sector_count = 35;
	382	info->size = 0x00400000;
	383	break; /* => 4 MB */
	384
c609719b WD	385	default:
	386	info->flash_id = FLASH_UNKNOWN;
	387	return (0); /* => no or unknown flash */
	388	}
	389
	390	/* set up sector start address table */
	391	switch (value) {
71f95118 WD	392	#ifdef CONFIG_TQM8xxM /* mirror bit flash */
	393	case AMD_ID_MIRROR:
	394	switch (info->flash_id & FLASH_TYPEMASK) {
	395	/* only known types here - no default */
	396	case FLASH_AMLV128U:
f12e568c WD	397	case FLASH_AMLV640U:
f12e568c WD	398	case FLASH_AMLV320U:
71f95118 WD	399	for (i = 0; i < info->sector_count; i++) {
	400	info->start[i] = base;
	401	base += 0x20000;
	402	}
	403	break;
	404	}
	405	break;
	406	# else /* ! TQM8xxM */
c609719b WD	407	case AMD_ID_LV400B:
c609719b WD	408	case AMD_ID_LV800B:
c609719b WD	409	/* set sector offsets for bottom boot block type */
	410	info->start[0] = base + 0x00000000;
	411	info->start[1] = base + 0x00008000;
	412	info->start[2] = base + 0x0000C000;
	413	info->start[3] = base + 0x00010000;
	414	for (i = 4; i < info->sector_count; i++) {
	415	info->start[i] = base + (i * 0x00020000) - 0x00060000;
	416	}
	417	break;
	418	case AMD_ID_LV400T:
	419	case AMD_ID_LV800T:
c609719b WD	420	/* set sector offsets for top boot block type */
	421	i = info->sector_count - 1;
	422	info->start[i--] = base + info->size - 0x00008000;
	423	info->start[i--] = base + info->size - 0x0000C000;
	424	info->start[i--] = base + info->size - 0x00010000;
	425	for (; i >= 0; i--) {
	426	info->start[i] = base + i * 0x00020000;
	427	}
	428	break;
	429	case AMD_ID_LV320B:
	430	for (i = 0; i < info->sector_count; i++) {
	431	info->start[i] = base;
	432	/*
	433	* The first 8 sectors are 8 kB,
	434	* all the other ones are 64 kB
	435	*/
	436	base += (i < 8)
	437	? 2 * ( 8 << 10)
	438	: 2 * (64 << 10);
	439	}
	440	break;
	441	case AMD_ID_LV320T:
	442	for (i = 0; i < info->sector_count; i++) {
	443	info->start[i] = base;
	444	/*
	445	* The last 8 sectors are 8 kB,
	446	* all the other ones are 64 kB
	447	*/
	448	base += (i < (info->sector_count - 8))
	449	? 2 * (64 << 10)
	450	: 2 * ( 8 << 10);
	451	}
	452	break;
71f95118	453	#endif /* TQM8xxM */
f12e568c WD	454	case AMD_ID_LV160B:
	455	/* set sector offsets for bottom boot block type */
	456	info->start[0] = base + 0x00000000;
	457	info->start[1] = base + 0x00008000;
	458	info->start[2] = base + 0x0000C000;
	459	info->start[3] = base + 0x00010000;
	460	for (i = 4; i < info->sector_count; i++) {
	461	info->start[i] = base + (i * 0x00020000) - 0x00060000;
	462	}
	463	break;
	464	case AMD_ID_LV160T:
	465	/* set sector offsets for top boot block type */
	466	i = info->sector_count - 1;
	467	info->start[i--] = base + info->size - 0x00008000;
	468	info->start[i--] = base + info->size - 0x0000C000;
	469	info->start[i--] = base + info->size - 0x00010000;
	470	for (; i >= 0; i--) {
	471	info->start[i] = base + i * 0x00020000;
	472	}
	473	break;
c609719b WD	474	default:
	475	return (0);
	476	break;
	477	}
	478
	479	/* check for protected sectors */
	480	for (i = 0; i < info->sector_count; i++) {
	481	/* read sector protection at sector address, (A7 .. A0) = 0x02 */
	482	/* D0 = 1 if protected */
	483	addr = (volatile unsigned long *)(info->start[i]);
	484	info->protect[i] = addr[2] & 1;
	485	}
	486
	487	/*
	488	* Prevent writes to uninitialized FLASH.
	489	*/
	490	if (info->flash_id != FLASH_UNKNOWN) {
	491	addr = (volatile unsigned long *)info->start[0];
	492
	493	addr = 0x00F000F0; / reset bank */
	494	}
	495
	496	return (info->size);
	497	}
	498
	499
	500	/*-----------------------------------------------------------------------
	501	*/
	502
	503	int flash_erase (flash_info_t *info, int s_first, int s_last)
	504	{
	505	vu_long addr = (vu_long)(info->start[0]);
	506	int flag, prot, sect, l_sect;
	507	ulong start, now, last;
	508
73a8b27c WD	509	debug ("flash_erase: first: %d last: %d\n", s_first, s_last);
73a8b27c WD	510
c609719b WD	511	if ((s_first < 0) \|\| (s_first > s_last)) {
	512	if (info->flash_id == FLASH_UNKNOWN) {
	513	printf ("- missing\n");
	514	} else {
	515	printf ("- no sectors to erase\n");
	516	}
	517	return 1;
	518	}
	519
	520	if ((info->flash_id == FLASH_UNKNOWN) \|\|
	521	(info->flash_id > FLASH_AMD_COMP)) {
	522	printf ("Can't erase unknown flash type %08lx - aborted\n",
	523	info->flash_id);
	524	return 1;
	525	}
	526
	527	prot = 0;
	528	for (sect=s_first; sect<=s_last; ++sect) {
	529	if (info->protect[sect]) {
	530	prot++;
	531	}
	532	}
	533
	534	if (prot) {
	535	printf ("- Warning: %d protected sectors will not be erased!\n",
	536	prot);
	537	} else {
	538	printf ("\n");
	539	}
	540
	541	l_sect = -1;
	542
	543	/* Disable interrupts which might cause a timeout here */
	544	flag = disable_interrupts();
	545
	546	addr[0x0555] = 0x00AA00AA;
	547	addr[0x02AA] = 0x00550055;
	548	addr[0x0555] = 0x00800080;
	549	addr[0x0555] = 0x00AA00AA;
	550	addr[0x02AA] = 0x00550055;
	551
	552	/* Start erase on unprotected sectors */
	553	for (sect = s_first; sect<=s_last; sect++) {
	554	if (info->protect[sect] == 0) { /* not protected */
	555	addr = (vu_long*)(info->start[sect]);
	556	addr[0] = 0x00300030;
	557	l_sect = sect;
	558	}
	559	}
	560
	561	/* re-enable interrupts if necessary */
	562	if (flag)
	563	enable_interrupts();
	564
	565	/* wait at least 80us - let's wait 1 ms */
	566	udelay (1000);
	567
	568	/*
	569	* We wait for the last triggered sector
	570	*/
	571	if (l_sect < 0)
	572	goto DONE;
	573
	574	start = get_timer (0);
575	last = start;
576	addr = (vu_long*)(info->start[l_sect]);
577	while ((addr[0] & 0x00800080) != 0x00800080) {
578	if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
579	printf ("Timeout\n");
580	return 1;
581	}
582	/* show that we're waiting */
583	if ((now - last) > 1000) { /* every second */
584	putc ('.');
585	last = now;
586	}
587	}
588
589	DONE:
590	/* reset to read mode */
591	addr = (volatile unsigned long *)info->start[0];
592	addr[0] = 0x00F000F0; /* reset bank */
593
594	printf (" done\n");
595	return 0;
596	}
597
598	/*-----------------------------------------------------------------------
599	* Copy memory to flash, returns:
600	* 0 - OK
601	* 1 - write timeout
602	* 2 - Flash not erased
603	*/
604
605	int write_buff (flash_info_t info, uchar src, ulong addr, ulong cnt)
606	{
607	ulong cp, wp, data;
608	int i, l, rc;
609
610	wp = (addr & ~3); /* get lower word aligned address */
611
612	/*
613	* handle unaligned start bytes
614	*/
615	if ((l = addr - wp) != 0) {
616	data = 0;
617	for (i=0, cp=wp; i<l; ++i, ++cp) {
618	data = (data << 8) \| ((uchar )cp);
619	}
620	for (; i<4 && cnt>0; ++i) {
621	data = (data << 8) \| *src++;
622	--cnt;
623	++cp;
624	}
625	for (; cnt==0 && i<4; ++i, ++cp) {
626	data = (data << 8) \| ((uchar )cp);
627	}
628
629	if ((rc = write_word(info, wp, data)) != 0) {
630	return (rc);
631	}
632	wp += 4;
633	}
634
635	/*
636	* handle word aligned part
637	*/
638	while (cnt >= 4) {
639	data = 0;
640	for (i=0; i<4; ++i) {
641	data = (data << 8) \| *src++;
642	}
643	if ((rc = write_word(info, wp, data)) != 0) {
644	return (rc);
645	}
646	wp += 4;
647	cnt -= 4;
648	}
649
650	if (cnt == 0) {
651	return (0);
652	}
653
654	/*
655	* handle unaligned tail bytes
656	*/
657	data = 0;
658	for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
659	data = (data << 8) \| *src++;
660	--cnt;
661	}
662	for (; i<4; ++i, ++cp) {
663	data = (data << 8) \| ((uchar )cp);
664	}
665
666	return (write_word(info, wp, data));
667	}
668
669	/*-----------------------------------------------------------------------
670	* Write a word to Flash, returns:
671	* 0 - OK
672	* 1 - write timeout
673	* 2 - Flash not erased
674	*/
675	static int write_word (flash_info_t *info, ulong dest, ulong data)
676	{
677	vu_long addr = (vu_long)(info->start[0]);
678	ulong start;
679	int flag;
680
681	/* Check if Flash is (sufficiently) erased */
682	if ((((vu_long )dest) & data) != data) {
683	return (2);
684	}
685	/* Disable interrupts which might cause a timeout here */
686	flag = disable_interrupts();
687
688	addr[0x0555] = 0x00AA00AA;
689	addr[0x02AA] = 0x00550055;
690	addr[0x0555] = 0x00A000A0;
691
692	((vu_long )dest) = data;
693
694	/* re-enable interrupts if necessary */
695	if (flag)
696	enable_interrupts();
697
698	/* data polling for D7 */
699	start = get_timer (0);
700	while ((((vu_long )dest) & 0x00800080) != (data & 0x00800080)) {
701	if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
702	return (1);
703	}
704	}
705	return (0);
706	}
707
708	/*-----------------------------------------------------------------------
709	*/