[u-boot.git] / board / genietv / flash.c

/*
 * (C) Copyright 2000
 * Wolfgang Denk, DENX Software Engineering, [email protected].
 *
 * 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>
#include <mpc8xx.h>

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);
static void flash_get_offsets (ulong base, flash_info_t *info);

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

unsigned long flash_init (void)
{
	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;

	/* Detect size */
	size_b0 = flash_get_size((vu_long *)CFG_FLASH_BASE, &flash_info[0]);

	/* Setup offsets */
	flash_get_offsets (CFG_FLASH_BASE, &flash_info[0]);

#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[0]);
#endif

	size_b1 = 0 ;

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

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

	return (size_b0 + size_b1);
}

/*-----------------------------------------------------------------------
 * Fix this to support variable sector sizes
*/
static void flash_get_offsets (ulong base, flash_info_t *info)
{
	int i;

	/* set up sector start address table */
	if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040) {
		/* set sector offsets for bottom boot block type	*/
		for (i = 0; i < info->sector_count; i++)
			info->start[i] = base + (i * 0x00010000);
	}
}

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

	if (info->flash_id == FLASH_UNKNOWN)
	{
		puts ("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;
		case FLASH_MAN_BM:	printf ("BRIGHT MICRO ");	break;
		default:		printf ("Unknown Vendor ");	break;
	}

	switch (info->flash_id & FLASH_TYPEMASK)
	{
		case FLASH_AM040:	printf ("29F040 or 29LV040 (4 Mbit, uniform sectors)\n");
			break;
		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_AM160B:	printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
					break;
		case FLASH_AM160T:	printf ("AM29LV160T (16 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;
		default:		printf ("Unknown Chip Type\n");
					break;
	}

	if (info->size >> 20) {
	    printf ("  Size: %ld MB in %d Sectors\n",
		info->size >> 20,
		info->sector_count);
	} else {
	    printf ("  Size: %ld KB in %d Sectors\n",
		info->size >> 10,
		info->sector_count);
	}

	puts ("  Sector Start Addresses:");

	for (i=0; i<info->sector_count; ++i)
	{
		if ((i % 5) == 0)
		{
			puts ("\n   ");
		}

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

	putc ('\n');
	return;
}
/*-----------------------------------------------------------------------
 */

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

static ulong flash_get_size (vu_long *addr, flash_info_t *info)
{
	short i;
	volatile unsigned char *caddr;
	char value;

	caddr = (volatile unsigned char *)addr ;

	/* Write auto select command: read Manufacturer ID */

#if 0
	printf("Base address is: %08x\n", caddr);
#endif

	caddr[0x0555] = 0xAA;
	caddr[0x02AA] = 0x55;
	caddr[0x0555] = 0x90;

	value = caddr[0];

#if 0
	printf("Manufact ID: %02x\n", value);
#endif
	switch (value)
	{
		case 0x1: /* AMD_MANUFACT */
			info->flash_id = FLASH_MAN_AMD;
		break;

		case 0x4: /* FUJ_MANUFACT */
			info->flash_id = FLASH_MAN_FUJ;
		break;

		default:
			info->flash_id = FLASH_UNKNOWN;
			info->sector_count = 0;
			info->size = 0;
			break;
	}

	value = caddr[1];			/* device ID		*/
#if 0
	printf("Device ID: %02x\n", value);
#endif
	switch (value)
	{
		case AMD_ID_LV040B:
			info->flash_id += FLASH_AM040;
			info->sector_count = 8;
			info->size = 0x00080000;
			break;				/* => 512Kb		*/

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

	}

	flash_get_offsets ((ulong)addr, &flash_info[0]);

	/* 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 */
		caddr = (volatile unsigned char *)(info->start[i]);
		info->protect[i] = caddr[2] & 1;
	}

	/*
	 * Prevent writes to uninitialized FLASH.
	 */
	if (info->flash_id != FLASH_UNKNOWN)
	{
		caddr = (volatile unsigned char *)info->start[0];
		*caddr = 0xF0;	/* reset bank */
	}

	return (info->size);
}


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

int	flash_erase (flash_info_t *info, int s_first, int s_last)
{
	volatile unsigned char *addr = (volatile unsigned char *)(info->start[0]);
	int flag, prot, sect, l_sect;
	ulong start, now, 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 - aborted\n");
		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] = 0xAA;
	addr[0x02AA] = 0x55;
	addr[0x0555] = 0x80;
	addr[0x0555] = 0xAA;
	addr[0x02AA] = 0x55;

	/* Start erase on unprotected sectors */
	for (sect = s_first; sect<=s_last; sect++) {
		if (info->protect[sect] == 0) {	/* not protected */
			addr = (volatile unsigned char *)(info->start[sect]);
			addr[0] = 0x30;
			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 = (volatile unsigned char *)(info->start[l_sect]);

	while ((addr[0] & 0xFF) != 0xFF)
	{
		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 char *)info->start[0];

	addr[0] = 0xF0;	/* 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)
{
	volatile unsigned char *addr = (volatile unsigned char*)(info->start[0]),
				*cdest,*cdata;
	ulong start;
	int flag, count = 4 ;

	cdest = (volatile unsigned char *)dest ;
	cdata = (volatile unsigned char *)&data ;

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

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

	    addr[0x0555] = 0xAA;
	    addr[0x02AA] = 0x55;
	    addr[0x0555] = 0xA0;

	    *cdest = *cdata;

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

	    /* data polling for D7 */
	    start = get_timer (0);
	    while ((*cdest ^ *cdata) & 0x80)
	    {
		if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
			return (1);
		}
	    }

	    cdata++ ;
	    cdest++ ;
	}
	return (0);
}

/*-----------------------------------------------------------------------
 */
Commit	Line	Data
affae2bf WD	1	/*
	2	* (C) Copyright 2000
	3	* Wolfgang Denk, DENX Software Engineering, [email protected].
	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
	24	#include <common.h>
	25	#include <mpc8xx.h>
	26
	27	flash_info_t flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips */
	28
	29	/*-----------------------------------------------------------------------
	30	* Functions
	31	*/
	32	static ulong flash_get_size (vu_long addr, flash_info_t info);
	33	static int write_word (flash_info_t *info, ulong dest, ulong data);
	34	static void flash_get_offsets (ulong base, flash_info_t *info);
	35
	36	/*-----------------------------------------------------------------------
	37	*/
	38
	39	unsigned long flash_init (void)
	40	{
	41	unsigned long size_b0, size_b1;
	42	int i;
	43
	44	/* Init: no FLASHes known */
	45	for (i=0; i < CFG_MAX_FLASH_BANKS; ++i)
	46	flash_info[i].flash_id = FLASH_UNKNOWN;
	47
	48	/* Detect size */
	49	size_b0 = flash_get_size((vu_long *)CFG_FLASH_BASE, &flash_info[0]);
	50
	51	/* Setup offsets */
	52	flash_get_offsets (CFG_FLASH_BASE, &flash_info[0]);
	53
	54	#if CFG_MONITOR_BASE >= CFG_FLASH_BASE
	55	/* Monitor protection ON by default */
	56	flash_protect(FLAG_PROTECT_SET,
	57	CFG_MONITOR_BASE,
3b57fe0a	58	CFG_MONITOR_BASE+monitor_flash_len-1,
affae2bf WD	59	&flash_info[0]);
	60	#endif
	61
	62	size_b1 = 0 ;
	63
	64	flash_info[1].flash_id = FLASH_UNKNOWN;
	65	flash_info[1].sector_count = -1;
	66
	67	flash_info[0].size = size_b0;
	68	flash_info[1].size = size_b1;
	69
	70	return (size_b0 + size_b1);
	71	}
	72
	73	/*-----------------------------------------------------------------------
	74	* Fix this to support variable sector sizes
	75	*/
	76	static void flash_get_offsets (ulong base, flash_info_t *info)
	77	{
	78	int i;
	79
	80	/* set up sector start address table */
	81	if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040) {
	82	/* set sector offsets for bottom boot block type */
	83	for (i = 0; i < info->sector_count; i++)
	84	info->start[i] = base + (i * 0x00010000);
	85	}
	86	}
	87
	88	/*-----------------------------------------------------------------------
	89	*/
	90	void flash_print_info (flash_info_t *info)
	91	{
	92	int i;
	93
	94	if (info->flash_id == FLASH_UNKNOWN)
	95	{
	96	puts ("missing or unknown FLASH type\n");
	97	return;
	98	}
	99
	100	switch (info->flash_id & FLASH_VENDMASK)
	101	{
	102	case FLASH_MAN_AMD: printf ("AMD "); break;
	103	case FLASH_MAN_FUJ: printf ("FUJITSU "); break;
	104	case FLASH_MAN_BM: printf ("BRIGHT MICRO "); break;
	105	default: printf ("Unknown Vendor "); break;
	106	}
	107
	108	switch (info->flash_id & FLASH_TYPEMASK)
	109	{
	110	case FLASH_AM040: printf ("29F040 or 29LV040 (4 Mbit, uniform sectors)\n");
	111	break;
	112	case FLASH_AM400B: printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
	113	break;
	114	case FLASH_AM400T: printf ("AM29LV400T (4 Mbit, top boot sector)\n");
	115	break;
	116	case FLASH_AM800B: printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
	117	break;
	118	case FLASH_AM800T: printf ("AM29LV800T (8 Mbit, top boot sector)\n");
	119	break;
	120	case FLASH_AM160B: printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
	121	break;
	122	case FLASH_AM160T: printf ("AM29LV160T (16 Mbit, top boot sector)\n");
123	break;
124	case FLASH_AM320B: printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
125	break;
126	case FLASH_AM320T: printf ("AM29LV320T (32 Mbit, top boot sector)\n");
127	break;
128	default: printf ("Unknown Chip Type\n");
129	break;
130	}
131
132	if (info->size >> 20) {
133	printf (" Size: %ld MB in %d Sectors\n",
53677ef1	134	info->size >> 20,
affae2bf WD	135	info->sector_count);
	136	} else {
	137	printf (" Size: %ld KB in %d Sectors\n",
53677ef1	138	info->size >> 10,
affae2bf WD	139	info->sector_count);
	140	}
	141
	142	puts (" Sector Start Addresses:");
	143
	144	for (i=0; i<info->sector_count; ++i)
	145	{
	146	if ((i % 5) == 0)
	147	{
	148	puts ("\n ");
	149	}
	150
	151	printf (" %08lX%s",
	152	info->start[i],
	153	info->protect[i] ? " (RO)" : " ");
	154	}
	155
	156	putc ('\n');
	157	return;
	158	}
	159	/*-----------------------------------------------------------------------
	160	*/
	161
	162	/*
	163	* The following code cannot be run from FLASH!
	164	*/
	165
	166	static ulong flash_get_size (vu_long addr, flash_info_t info)
	167	{
	168	short i;
	169	volatile unsigned char *caddr;
	170	char value;
	171
	172	caddr = (volatile unsigned char *)addr ;
	173
	174	/* Write auto select command: read Manufacturer ID */
	175
	176	#if 0
	177	printf("Base address is: %08x\n", caddr);
	178	#endif
	179
	180	caddr[0x0555] = 0xAA;
	181	caddr[0x02AA] = 0x55;
	182	caddr[0x0555] = 0x90;
	183
	184	value = caddr[0];
	185
	186	#if 0
	187	printf("Manufact ID: %02x\n", value);
	188	#endif
	189	switch (value)
	190	{
77ddac94	191	case 0x1: /* AMD_MANUFACT */
affae2bf WD	192	info->flash_id = FLASH_MAN_AMD;
	193	break;
	194
77ddac94	195	case 0x4: /* FUJ_MANUFACT */
affae2bf WD	196	info->flash_id = FLASH_MAN_FUJ;
	197	break;
	198
	199	default:
	200	info->flash_id = FLASH_UNKNOWN;
	201	info->sector_count = 0;
	202	info->size = 0;
	203	break;
	204	}
	205
	206	value = caddr[1]; /* device ID */
	207	#if 0
	208	printf("Device ID: %02x\n", value);
	209	#endif
	210	switch (value)
	211	{
	212	case AMD_ID_LV040B:
	213	info->flash_id += FLASH_AM040;
	214	info->sector_count = 8;
	215	info->size = 0x00080000;
53677ef1	216	break; /* => 512Kb */
affae2bf WD	217
	218	default:
	219	info->flash_id = FLASH_UNKNOWN;
	220	return (0); /* => no or unknown flash */
	221
	222	}
	223
	224	flash_get_offsets ((ulong)addr, &flash_info[0]);
	225
	226	/* check for protected sectors */
	227	for (i = 0; i < info->sector_count; i++)
	228	{
	229	/* read sector protection at sector address, (A7 .. A0) = 0x02 */
	230	/* D0 = 1 if protected */
	231	caddr = (volatile unsigned char *)(info->start[i]);
	232	info->protect[i] = caddr[2] & 1;
	233	}
	234
	235	/*
	236	* Prevent writes to uninitialized FLASH.
	237	*/
	238	if (info->flash_id != FLASH_UNKNOWN)
	239	{
	240	caddr = (volatile unsigned char *)info->start[0];
	241	caddr = 0xF0; / reset bank */
	242	}
	243
	244	return (info->size);
	245	}
	246
	247
	248	/*-----------------------------------------------------------------------
	249	*/
	250
	251	int flash_erase (flash_info_t *info, int s_first, int s_last)
	252	{
	253	volatile unsigned char addr = (volatile unsigned char )(info->start[0]);
	254	int flag, prot, sect, l_sect;
	255	ulong start, now, last;
	256
	257	if ((s_first < 0) \|\| (s_first > s_last)) {
	258	if (info->flash_id == FLASH_UNKNOWN) {
	259	printf ("- missing\n");
	260	} else {
	261	printf ("- no sectors to erase\n");
	262	}
	263	return 1;
	264	}
	265
	266	if ((info->flash_id == FLASH_UNKNOWN) \|\|
	267	(info->flash_id > FLASH_AMD_COMP)) {
	268	printf ("Can't erase unknown flash type - aborted\n");
	269	return 1;
	270	}
	271
	272	prot = 0;
	273	for (sect=s_first; sect<=s_last; ++sect) {
	274	if (info->protect[sect]) {
	275	prot++;
	276	}
	277	}
	278
	279	if (prot) {
	280	printf ("- Warning: %d protected sectors will not be erased!\n",
281	prot);
282	} else {
283	printf ("\n");
284	}
285
286	l_sect = -1;
287
288	/* Disable interrupts which might cause a timeout here */
289	flag = disable_interrupts();
290
291	addr[0x0555] = 0xAA;
292	addr[0x02AA] = 0x55;
293	addr[0x0555] = 0x80;
294	addr[0x0555] = 0xAA;
295	addr[0x02AA] = 0x55;
296
297	/* Start erase on unprotected sectors */
298	for (sect = s_first; sect<=s_last; sect++) {
299	if (info->protect[sect] == 0) { /* not protected */
300	addr = (volatile unsigned char *)(info->start[sect]);
301	addr[0] = 0x30;
302	l_sect = sect;
303	}
304	}
305
306	/* re-enable interrupts if necessary */
307	if (flag)
308	enable_interrupts();
309
310	/* wait at least 80us - let's wait 1 ms */
311	udelay (1000);
312
313	/*
314	* We wait for the last triggered sector
315	*/
316	if (l_sect < 0)
317	goto DONE;
318
319	start = get_timer (0);
320	last = start;
321	addr = (volatile unsigned char *)(info->start[l_sect]);
322
323	while ((addr[0] & 0xFF) != 0xFF)
324	{
325	if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
326	printf ("Timeout\n");
327	return 1;
328	}
329	/* show that we're waiting */
330	if ((now - last) > 1000) { /* every second */
331	putc ('.');
332	last = now;
333	}
334	}
335
336	DONE:
337	/* reset to read mode */
338	addr = (volatile unsigned char *)info->start[0];
339
340	addr[0] = 0xF0; /* reset bank */
341
342	printf (" done\n");
343	return 0;
344	}
345
346	/*-----------------------------------------------------------------------
347	* Copy memory to flash, returns:
348	* 0 - OK
349	* 1 - write timeout
350	* 2 - Flash not erased
351	*/
352
353	int write_buff (flash_info_t info, uchar src, ulong addr, ulong cnt)
354	{
355	ulong cp, wp, data;
356	int i, l, rc;
357
358	wp = (addr & ~3); /* get lower word aligned address */
359
360	/*
361	* handle unaligned start bytes
362	*/
363	if ((l = addr - wp) != 0) {
364	data = 0;
365	for (i=0, cp=wp; i<l; ++i, ++cp) {
366	data = (data << 8) \| ((uchar )cp);
367	}
368	for (; i<4 && cnt>0; ++i) {
369	data = (data << 8) \| *src++;
370	--cnt;
371	++cp;
372	}
373	for (; cnt==0 && i<4; ++i, ++cp) {
374	data = (data << 8) \| ((uchar )cp);
375	}
376
377	if ((rc = write_word(info, wp, data)) != 0) {
378	return (rc);
379	}
380	wp += 4;
381	}
382
383	/*
384	* handle word aligned part
385	*/
386	while (cnt >= 4) {
387	data = 0;
388	for (i=0; i<4; ++i) {
389	data = (data << 8) \| *src++;
390	}
391	if ((rc = write_word(info, wp, data)) != 0) {
392	return (rc);
393	}
394	wp += 4;
395	cnt -= 4;
396	}
397
398	if (cnt == 0) {
399	return (0);
400	}
401
402	/*
403	* handle unaligned tail bytes
404	*/
405	data = 0;
406	for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
407	data = (data << 8) \| *src++;
408	--cnt;
409	}
410	for (; i<4; ++i, ++cp) {
411	data = (data << 8) \| ((uchar )cp);
412	}
413
414	return (write_word(info, wp, data));
415	}
416
417	/*-----------------------------------------------------------------------
418	* Write a word to Flash, returns:
419	* 0 - OK
420	* 1 - write timeout
421	* 2 - Flash not erased
422	*/
423	static int write_word (flash_info_t *info, ulong dest, ulong data)
424	{
425	volatile unsigned char addr = (volatile unsigned char)(info->start[0]),
426	cdest,cdata;
427	ulong start;
428	int flag, count = 4 ;
429
430	cdest = (volatile unsigned char *)dest ;
431	cdata = (volatile unsigned char *)&data ;
432
433	/* Check if Flash is (sufficiently) erased */
434	if ((((vu_long )dest) & data) != data) {
435	return (2);
436	}
437
438	while(count--)
439	{
440	/* Disable interrupts which might cause a timeout here */
441	flag = disable_interrupts();
442
443	addr[0x0555] = 0xAA;
444	addr[0x02AA] = 0x55;
445	addr[0x0555] = 0xA0;
446
447	cdest = cdata;
448
449	/* re-enable interrupts if necessary */
450	if (flag)
53677ef1	451	enable_interrupts();
affae2bf WD	452
	453	/* data polling for D7 */
	454	start = get_timer (0);
	455	while ((cdest ^ cdata) & 0x80)
	456	{
	457	if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
	458	return (1);
	459	}
	460	}
	461
	462	cdata++ ;
	463	cdest++ ;
	464	}
	465	return (0);
	466	}
	467
	468	/*-----------------------------------------------------------------------
	469	*/