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

/*
 * (C) Copyright 2000-2011
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

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

flash_info_t	flash_info[CONFIG_SYS_MAX_FLASH_BANKS];

/*-----------------------------------------------------------------------
 * 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;
	int i;

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

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

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

#if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
	/* Monitor protection ON by default */
	flash_protect(FLAG_PROTECT_SET,
		      CONFIG_SYS_MONITOR_BASE,
		      CONFIG_SYS_MONITOR_BASE+monitor_flash_len-1,
		      &flash_info[0]);
#endif

	flash_info[0].size = size_b0;

	return size_b0;
}

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

	debug("Base address is: %8p\n", caddr);

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

	value = caddr[0];

	debug("Manufact ID: %02x\n", value);

	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		*/

	debug("Device ID: %02x\n", value);

	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) {

		now = get_timer(start);

		if (now > CONFIG_SYS_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
	 */
	l = addr - wp;

	if (l != 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);

		rc = write_word(info, wp, data);

		if (rc != 0)
			return rc;

		wp += 4;
	}

	/*
	 * handle word aligned part
	 */
	while (cnt >= 4) {
		data = 0;
		for (i = 0; i < 4; ++i)
			data = (data << 8) | *src++;

		rc = write_word(info, wp, data);

		if (rc != 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 *cdest, *cdata;
	volatile unsigned char *addr =
		(volatile unsigned char *)(info->start[0]);
	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) > CONFIG_SYS_FLASH_WRITE_TOUT)
				return 1;
		}

		cdata++ ;
		cdest++ ;
	}
	return 0;
}
Commit	Line	Data
affae2bf	1	/*
250b66e2	2	* (C) Copyright 2000-2011
affae2bf WD	3	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
affae2bf WD	4	*
1a459660	5	* SPDX-License-Identifier: GPL-2.0+
affae2bf WD	6	*/
	7
	8	#include <common.h>
	9	#include <mpc8xx.h>
	10
098a8a83	11	flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];
affae2bf WD	12
	13	/*-----------------------------------------------------------------------
	14	* Functions
	15	*/
098a8a83 WD	16	static ulong flash_get_size(vu_long addr, flash_info_t info);
	17	static int write_word(flash_info_t *info, ulong dest, ulong data);
	18	static void flash_get_offsets(ulong base, flash_info_t *info);
affae2bf WD	19
	20	/*-----------------------------------------------------------------------
	21	*/
	22
098a8a83	23	unsigned long flash_init(void)
affae2bf	24	{
250b66e2	25	unsigned long size_b0;
affae2bf WD	26	int i;
	27
	28	/* Init: no FLASHes known */
098a8a83 WD	29	for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; ++i)
098a8a83 WD	30	flash_info[i].flash_id = FLASH_UNKNOWN;
affae2bf WD	31
affae2bf WD	32	/* Detect size */
098a8a83 WD	33	size_b0 = flash_get_size((vu_long *)CONFIG_SYS_FLASH_BASE,
098a8a83 WD	34	&flash_info[0]);
affae2bf WD	35
affae2bf WD	36	/* Setup offsets */
098a8a83	37	flash_get_offsets(CONFIG_SYS_FLASH_BASE, &flash_info[0]);
affae2bf	38
6d0f6bcf	39	#if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
affae2bf WD	40	/* Monitor protection ON by default */
affae2bf WD	41	flash_protect(FLAG_PROTECT_SET,
6d0f6bcf JCPV	42	CONFIG_SYS_MONITOR_BASE,
6d0f6bcf JCPV	43	CONFIG_SYS_MONITOR_BASE+monitor_flash_len-1,
affae2bf WD	44	&flash_info[0]);
	45	#endif
	46
affae2bf	47	flash_info[0].size = size_b0;
affae2bf	48
250b66e2	49	return size_b0;
affae2bf WD	50	}
	51
	52	/*-----------------------------------------------------------------------
	53	* Fix this to support variable sector sizes
	54	*/
098a8a83	55	static void flash_get_offsets(ulong base, flash_info_t *info)
affae2bf WD	56	{
	57	int i;
	58
	59	/* set up sector start address table */
	60	if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040) {
	61	/* set sector offsets for bottom boot block type */
	62	for (i = 0; i < info->sector_count; i++)
	63	info->start[i] = base + (i * 0x00010000);
	64	}
	65	}
	66
	67	/*-----------------------------------------------------------------------
	68	*/
098a8a83	69	void flash_print_info(flash_info_t *info)
affae2bf WD	70	{
	71	int i;
	72
098a8a83 WD	73	if (info->flash_id == FLASH_UNKNOWN) {
098a8a83 WD	74	puts("missing or unknown FLASH type\n");
affae2bf WD	75	return;
	76	}
	77
098a8a83 WD	78	switch (info->flash_id & FLASH_VENDMASK) {
	79	case FLASH_MAN_AMD:
	80	printf("AMD ");
	81	break;
	82	case FLASH_MAN_FUJ:
	83	printf("FUJITSU ");
	84	break;
	85	case FLASH_MAN_BM:
	86	printf("BRIGHT MICRO ");
	87	break;
	88	default:
	89	printf("Unknown Vendor ");
	90	break;
affae2bf WD	91	}
affae2bf WD	92
098a8a83 WD	93	switch (info->flash_id & FLASH_TYPEMASK) {
	94	case FLASH_AM040:
	95	printf("29F040 or 29LV040 (4 Mbit, uniform sectors)\n");
	96	break;
	97	case FLASH_AM400B:
	98	printf("AM29LV400B (4 Mbit, bottom boot sect)\n");
	99	break;
	100	case FLASH_AM400T:
	101	printf("AM29LV400T (4 Mbit, top boot sector)\n");
	102	break;
	103	case FLASH_AM800B:
	104	printf("AM29LV800B (8 Mbit, bottom boot sect)\n");
	105	break;
	106	case FLASH_AM800T:
	107	printf("AM29LV800T (8 Mbit, top boot sector)\n");
	108	break;
	109	case FLASH_AM160B:
	110	printf("AM29LV160B (16 Mbit, bottom boot sect)\n");
	111	break;
	112	case FLASH_AM160T:
	113	printf("AM29LV160T (16 Mbit, top boot sector)\n");
	114	break;
	115	case FLASH_AM320B:
	116	printf("AM29LV320B (32 Mbit, bottom boot sect)\n");
	117	break;
	118	case FLASH_AM320T:
	119	printf("AM29LV320T (32 Mbit, top boot sector)\n");
	120	break;
	121	default:
	122	printf("Unknown Chip Type\n");
	123	break;
affae2bf WD	124	}
	125
	126	if (info->size >> 20) {
098a8a83 WD	127	printf(" Size: %ld MB in %d Sectors\n",
	128	info->size >> 20,
	129	info->sector_count);
affae2bf	130	} else {
098a8a83 WD	131	printf(" Size: %ld KB in %d Sectors\n",
	132	info->size >> 10,
	133	info->sector_count);
affae2bf WD	134	}
affae2bf WD	135
098a8a83	136	puts(" Sector Start Addresses:");
affae2bf	137
098a8a83	138	for (i = 0; i < info->sector_count; ++i) {
affae2bf	139	if ((i % 5) == 0)
098a8a83	140	puts("\n ");
affae2bf	141
098a8a83	142	printf(" %08lX%s",
affae2bf WD	143	info->start[i],
	144	info->protect[i] ? " (RO)" : " ");
	145	}
	146
098a8a83	147	putc('\n');
affae2bf WD	148	return;
	149	}
	150	/*-----------------------------------------------------------------------
	151	*/
	152
	153	/*
	154	* The following code cannot be run from FLASH!
	155	*/
	156
098a8a83	157	static ulong flash_get_size(vu_long addr, flash_info_t info)
affae2bf WD	158	{
	159	short i;
	160	volatile unsigned char *caddr;
	161	char value;
	162
	163	caddr = (volatile unsigned char *)addr ;
	164
	165	/* Write auto select command: read Manufacturer ID */
	166
250b66e2	167	debug("Base address is: %8p\n", caddr);
affae2bf WD	168
	169	caddr[0x0555] = 0xAA;
	170	caddr[0x02AA] = 0x55;
	171	caddr[0x0555] = 0x90;
	172
	173	value = caddr[0];
	174
098a8a83	175	debug("Manufact ID: %02x\n", value);
affae2bf	176
098a8a83 WD	177	switch (value) {
	178	case 0x1: /* AMD_MANUFACT */
	179	info->flash_id = FLASH_MAN_AMD;
	180	break;
	181	case 0x4: /* FUJ_MANUFACT */
	182	info->flash_id = FLASH_MAN_FUJ;
	183	break;
	184	default:
	185	info->flash_id = FLASH_UNKNOWN;
	186	info->sector_count = 0;
	187	info->size = 0;
affae2bf	188	break;
affae2bf WD	189	}
	190
	191	value = caddr[1]; /* device ID */
affae2bf	192
098a8a83 WD	193	debug("Device ID: %02x\n", value);
	194
	195	switch (value) {
	196	case AMD_ID_LV040B:
	197	info->flash_id += FLASH_AM040;
	198	info->sector_count = 8;
	199	info->size = 0x00080000;
	200	break; /* => 512Kb */
	201
	202	default:
	203	info->flash_id = FLASH_UNKNOWN;
	204	return 0; /* => no or unknown flash */
affae2bf WD	205	}
affae2bf WD	206
098a8a83	207	flash_get_offsets((ulong)addr, &flash_info[0]);
affae2bf WD	208
affae2bf WD	209	/* check for protected sectors */
098a8a83 WD	210	for (i = 0; i < info->sector_count; i++) {
	211	/*
	212	* read sector protection at sector address,
	213	* (A7 .. A0) = 0x02
	214	* D0 = 1 if protected
	215	*/
affae2bf WD	216	caddr = (volatile unsigned char *)(info->start[i]);
	217	info->protect[i] = caddr[2] & 1;
	218	}
	219
	220	/*
	221	* Prevent writes to uninitialized FLASH.
	222	*/
098a8a83	223	if (info->flash_id != FLASH_UNKNOWN) {
affae2bf WD	224	caddr = (volatile unsigned char *)info->start[0];
	225	caddr = 0xF0; / reset bank */
	226	}
	227
098a8a83	228	return info->size;
affae2bf WD	229	}
affae2bf WD	230
098a8a83	231	int flash_erase(flash_info_t *info, int s_first, int s_last)
affae2bf	232	{
098a8a83 WD	233	volatile unsigned char *addr =
098a8a83 WD	234	(volatile unsigned char *)(info->start[0]);
affae2bf WD	235	int flag, prot, sect, l_sect;
	236	ulong start, now, last;
	237
	238	if ((s_first < 0) \|\| (s_first > s_last)) {
098a8a83 WD	239	if (info->flash_id == FLASH_UNKNOWN)
	240	printf("- missing\n");
	241	else
	242	printf("- no sectors to erase\n");
	243
affae2bf WD	244	return 1;
	245	}
	246
	247	if ((info->flash_id == FLASH_UNKNOWN) \|\|
	248	(info->flash_id > FLASH_AMD_COMP)) {
098a8a83	249	printf("Can't erase unknown flash type - aborted\n");
affae2bf WD	250	return 1;
	251	}
	252
	253	prot = 0;
098a8a83 WD	254	for (sect = s_first; sect <= s_last; ++sect) {
098a8a83 WD	255	if (info->protect[sect])
affae2bf	256	prot++;
affae2bf WD	257	}
	258
	259	if (prot) {
098a8a83	260	printf("- Warning: %d protected sectors will not be erased!\n",
affae2bf WD	261	prot);
affae2bf WD	262	} else {
098a8a83	263	printf("\n");
affae2bf WD	264	}
	265
	266	l_sect = -1;
	267
	268	/* Disable interrupts which might cause a timeout here */
	269	flag = disable_interrupts();
	270
	271	addr[0x0555] = 0xAA;
	272	addr[0x02AA] = 0x55;
	273	addr[0x0555] = 0x80;
	274	addr[0x0555] = 0xAA;
	275	addr[0x02AA] = 0x55;
	276
	277	/* Start erase on unprotected sectors */
098a8a83	278	for (sect = s_first; sect <= s_last; sect++) {
affae2bf WD	279	if (info->protect[sect] == 0) { /* not protected */
	280	addr = (volatile unsigned char *)(info->start[sect]);
	281	addr[0] = 0x30;
	282	l_sect = sect;
	283	}
	284	}
	285
	286	/* re-enable interrupts if necessary */
	287	if (flag)
	288	enable_interrupts();
	289
	290	/* wait at least 80us - let's wait 1 ms */
098a8a83	291	udelay(1000);
affae2bf WD	292
	293	/*
	294	* We wait for the last triggered sector
	295	*/
	296	if (l_sect < 0)
	297	goto DONE;
	298
098a8a83	299	start = get_timer(0);
affae2bf WD	300	last = start;
	301	addr = (volatile unsigned char *)(info->start[l_sect]);
	302
098a8a83 WD	303	while ((addr[0] & 0xFF) != 0xFF) {
	304
	305	now = get_timer(start);
	306
	307	if (now > CONFIG_SYS_FLASH_ERASE_TOUT) {
	308	printf("Timeout\n");
affae2bf WD	309	return 1;
	310	}
	311	/* show that we're waiting */
	312	if ((now - last) > 1000) { /* every second */
098a8a83	313	putc('.');
affae2bf WD	314	last = now;
	315	}
	316	}
	317
	318	DONE:
	319	/* reset to read mode */
	320	addr = (volatile unsigned char *)info->start[0];
	321
	322	addr[0] = 0xF0; /* reset bank */
	323
098a8a83	324	printf(" done\n");
affae2bf WD	325	return 0;
	326	}
	327
	328	/*-----------------------------------------------------------------------
	329	* Copy memory to flash, returns:
	330	* 0 - OK
	331	* 1 - write timeout
	332	* 2 - Flash not erased
	333	*/
	334
098a8a83	335	int write_buff(flash_info_t info, uchar src, ulong addr, ulong cnt)
affae2bf WD	336	{
	337	ulong cp, wp, data;
	338	int i, l, rc;
	339
	340	wp = (addr & ~3); /* get lower word aligned address */
	341
	342	/*
	343	* handle unaligned start bytes
	344	*/
098a8a83 WD	345	l = addr - wp;
	346
	347	if (l != 0) {
affae2bf	348	data = 0;
098a8a83	349	for (i = 0, cp = wp; i < l; ++i, ++cp)
affae2bf	350	data = (data << 8) \| ((uchar )cp);
098a8a83 WD	351
098a8a83 WD	352	for (; i < 4 && cnt > 0; ++i) {
affae2bf WD	353	data = (data << 8) \| *src++;
	354	--cnt;
	355	++cp;
	356	}
098a8a83	357	for (; cnt == 0 && i < 4; ++i, ++cp)
affae2bf	358	data = (data << 8) \| ((uchar )cp);
affae2bf	359
098a8a83 WD	360	rc = write_word(info, wp, data);
	361
	362	if (rc != 0)
	363	return rc;
	364
affae2bf WD	365	wp += 4;
	366	}
	367
	368	/*
	369	* handle word aligned part
	370	*/
	371	while (cnt >= 4) {
	372	data = 0;
098a8a83	373	for (i = 0; i < 4; ++i)
affae2bf	374	data = (data << 8) \| *src++;
098a8a83 WD	375
	376	rc = write_word(info, wp, data);
	377
	378	if (rc != 0)
	379	return rc;
	380
affae2bf WD	381	wp += 4;
	382	cnt -= 4;
	383	}
	384
098a8a83 WD	385	if (cnt == 0)
098a8a83 WD	386	return 0;
affae2bf WD	387
	388	/*
	389	* handle unaligned tail bytes
	390	*/
	391	data = 0;
098a8a83	392	for (i = 0, cp = wp; i < 4 && cnt > 0; ++i, ++cp) {
affae2bf WD	393	data = (data << 8) \| *src++;
	394	--cnt;
	395	}
098a8a83	396	for (; i < 4; ++i, ++cp)
affae2bf	397	data = (data << 8) \| ((uchar )cp);
affae2bf	398
098a8a83	399	return write_word(info, wp, data);
affae2bf WD	400	}
	401
	402	/*-----------------------------------------------------------------------
	403	* Write a word to Flash, returns:
	404	* 0 - OK
	405	* 1 - write timeout
	406	* 2 - Flash not erased
	407	*/
098a8a83	408	static int write_word(flash_info_t *info, ulong dest, ulong data)
affae2bf	409	{
098a8a83 WD	410	volatile unsigned char cdest, cdata;
	411	volatile unsigned char *addr =
	412	(volatile unsigned char *)(info->start[0]);
affae2bf WD	413	ulong start;
	414	int flag, count = 4 ;
	415
	416	cdest = (volatile unsigned char *)dest ;
	417	cdata = (volatile unsigned char *)&data ;
	418
	419	/* Check if Flash is (sufficiently) erased */
098a8a83 WD	420	if ((((vu_long )dest) & data) != data)
098a8a83 WD	421	return 2;
affae2bf	422
098a8a83	423	while (count--) {
affae2bf	424
098a8a83 WD	425	/* Disable interrupts which might cause a timeout here */
098a8a83 WD	426	flag = disable_interrupts();
affae2bf	427
098a8a83 WD	428	addr[0x0555] = 0xAA;
	429	addr[0x02AA] = 0x55;
	430	addr[0x0555] = 0xA0;
affae2bf	431
098a8a83 WD	432	cdest = cdata;
	433
	434	/* re-enable interrupts if necessary */
	435	if (flag)
	436	enable_interrupts();
affae2bf	437
098a8a83 WD	438	/* data polling for D7 */
	439	start = get_timer(0);
	440	while ((cdest ^ cdata) & 0x80) {
	441	if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT)
	442	return 1;
affae2bf	443	}
affae2bf	444
098a8a83 WD	445	cdata++ ;
098a8a83 WD	446	cdest++ ;
affae2bf	447	}
098a8a83	448	return 0;
affae2bf	449	}