[J-u-boot.git] / board / cerf250 / flash.c

/*
 * (C) Copyright 2001
 * Kyle Harris, Nexus Technologies, Inc. [email protected]
 *
 * (C) Copyright 2001
 * 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 <linux/byteorder/swab.h>


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

/* Board support for 1 or 2 flash devices */
#define FLASH_PORT_WIDTH32
#undef FLASH_PORT_WIDTH16

#ifdef FLASH_PORT_WIDTH16
#define FLASH_PORT_WIDTH		ushort
#define FLASH_PORT_WIDTHV		vu_short
#define SWAP(x)               __swab16(x)
#else
#define FLASH_PORT_WIDTH		ulong
#define FLASH_PORT_WIDTHV		vu_long
#define SWAP(x)               __swab32(x)
#endif

#define FPW	   FLASH_PORT_WIDTH
#define FPWV   FLASH_PORT_WIDTHV

#define mb() __asm__ __volatile__ ("" : : : "memory")

/*-----------------------------------------------------------------------
 * Functions
 */
static ulong flash_get_size (FPW *addr, flash_info_t *info);
static int write_data (flash_info_t *info, ulong dest, FPW data);
static void flash_get_offsets (ulong base, flash_info_t *info);
void inline spin_wheel (void);

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

unsigned long flash_init (void)
{
	int i;
	ulong size = 0;

	for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
		switch (i) {
		case 0:
			flash_get_size ((FPW *) PHYS_FLASH_1, &flash_info[i]);
			flash_get_offsets (PHYS_FLASH_1, &flash_info[i]);
			break;
		case 1:
			flash_get_size ((FPW *) PHYS_FLASH_2, &flash_info[i]);
			flash_get_offsets (PHYS_FLASH_2, &flash_info[i]);
			break;
		default:
			panic ("configured too many flash banks!\n");
			break;
		}
		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_SIZE - 1, &flash_info[0] );

	return size;
}

/*-----------------------------------------------------------------------
 */
static void flash_get_offsets (ulong base, flash_info_t *info)
{
	int i;

	if (info->flash_id == FLASH_UNKNOWN) {
		return;
	}

	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL) {
		for (i = 0; i < info->sector_count; i++) {
			info->start[i] = base + (i * PHYS_FLASH_SECT_SIZE);
			info->protect[i] = 0;
		}
	}
}

/*-----------------------------------------------------------------------
 */
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_INTEL:
		printf ("INTEL ");
		break;
	default:
		printf ("Unknown Vendor ");
		break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_28F128J3A:
		printf ("28F128J3A\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 (FPW *addr, flash_info_t *info)
{
	volatile FPW value;

	/* Write auto select command: read Manufacturer ID */
	addr[0x5555] = (FPW) 0x00AA00AA;
	addr[0x2AAA] = (FPW) 0x00550055;
	addr[0x5555] = (FPW) 0x00900090;

	mb ();
	value = addr[0];

	switch (value) {

	case (FPW) INTEL_MANUFACT:
		info->flash_id = FLASH_MAN_INTEL;
		break;

	default:
		info->flash_id = FLASH_UNKNOWN;
		info->sector_count = 0;
		info->size = 0;
		addr[0] = (FPW) 0x00FF00FF;	/* restore read mode */
		return (0);			/* no or unknown flash  */
	}

	mb ();
	value = addr[1];			/* device ID        */

	switch (value) {

	case (FPW) INTEL_ID_28F128J3A:
		info->flash_id += FLASH_28F128J3A;
		info->sector_count = 128;
		info->size = 0x02000000;
		break;				/* => 16 MB     */

	default:
		info->flash_id = FLASH_UNKNOWN;
		break;
	}

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

	addr[0] = (FPW) 0x00FF00FF;		/* restore read mode */

	return (info->size);
}


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

int flash_erase (flash_info_t *info, int s_first, int s_last)
{
	int flag, prot, sect;
	ulong type, start, last;
	int rcode = 0;

	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;
	}

	type = (info->flash_id & FLASH_VENDMASK);
	if ((type != FLASH_MAN_INTEL)) {
		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");
	}

	start = get_timer (0);
	last = start;

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

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

			printf ("Erasing sector %2d ... ", sect);

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

			*addr = (FPW) 0x00500050;	/* clear status register */
			*addr = (FPW) 0x00200020;	/* erase setup */
			*addr = (FPW) 0x00D000D0;	/* erase confirm */

			while (((status = *addr) & (FPW) 0x00800080) != (FPW) 0x00800080) {
				if (get_timer_masked () > CONFIG_SYS_FLASH_ERASE_TOUT) {
					printf ("Timeout\n");
					*addr = (FPW) 0x00B000B0;	/* suspend erase     */
					*addr = (FPW) 0x00FF00FF;	/* reset to read mode */
					rcode = 1;
					break;
				}
			}

			*addr = 0x00500050;	/* clear status register cmd.   */
			*addr = 0x00FF00FF;	/* resest to read mode          */

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

/*-----------------------------------------------------------------------
 * Copy memory to flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 * 4 - Flash not identified
 */

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

	if (info->flash_id == FLASH_UNKNOWN) {
		return 4;
	}
/* get lower word aligned address */
#ifdef FLASH_PORT_WIDTH16
	wp = (addr & ~1);
	port_width = 2;
#else
	wp = (addr & ~3);
	port_width = 4;
#endif

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

		if ((rc = write_data (info, wp, SWAP (data))) != 0) {
			return (rc);
		}
		wp += port_width;
	}

	/*
	 * handle word aligned part
	 */
	count = 0;
	while (cnt >= port_width) {
		data = 0;
		for (i = 0; i < port_width; ++i) {
			data = (data << 8) | *src++;
		}
		if ((rc = write_data (info, wp, SWAP (data))) != 0) {
			return (rc);
		}
		wp += port_width;
		cnt -= port_width;
		if (count++ > 0x800) {
			spin_wheel ();
			count = 0;
		}
	}

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

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

	return (write_data (info, wp, SWAP (data)));
}

/*-----------------------------------------------------------------------
 * Write a word or halfword to Flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 */
static int write_data (flash_info_t *info, ulong dest, FPW data)
{
	FPWV *addr = (FPWV *) dest;
	ulong status;
	int flag;

	/* Check if Flash is (sufficiently) erased */
	if ((*addr & data) != data) {
		printf ("not erased at %08lx (%lx)\n", (ulong) addr, *addr);
		return (2);
	}
	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts ();

	*addr = (FPW) 0x00400040;	/* write setup */
	*addr = data;

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

	/* wait while polling the status register */
	while (((status = *addr) & (FPW) 0x00800080) != (FPW) 0x00800080) {
		if (get_timer_masked () > CONFIG_SYS_FLASH_WRITE_TOUT) {
			*addr = (FPW) 0x00FF00FF;	/* restore read mode */
			return (1);
		}
	}

	*addr = (FPW) 0x00FF00FF;	/* restore read mode */

	return (0);
}

void inline spin_wheel (void)
{
	static int p = 0;
	static char w[] = "\\/-";

	printf ("\010%c", w[p]);
	(++p == 3) ? (p = 0) : 0;
}
Commit	Line	Data
fabd46ac WD	1	/*
	2	* (C) Copyright 2001
	3	* Kyle Harris, Nexus Technologies, Inc. [email protected]
	4	*
	5	* (C) Copyright 2001
	6	* Wolfgang Denk, DENX Software Engineering, [email protected].
	7	*
	8	* See file CREDITS for list of people who contributed to this
	9	* project.
	10	*
	11	* This program is free software; you can redistribute it and/or
	12	* modify it under the terms of the GNU General Public License as
	13	* published by the Free Software Foundation; either version 2 of
	14	* the License, or (at your option) any later version.
	15	*
	16	* This program is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	* GNU General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License
	22	* along with this program; if not, write to the Free Software
	23	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	24	* MA 02111-1307 USA
	25	*/
	26
	27	#include <common.h>
	28	#include <linux/byteorder/swab.h>
	29
	30
6d0f6bcf	31	flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS]; /* info for FLASH chips */
fabd46ac WD	32
	33	/* Board support for 1 or 2 flash devices */
	34	#define FLASH_PORT_WIDTH32
	35	#undef FLASH_PORT_WIDTH16
	36
	37	#ifdef FLASH_PORT_WIDTH16
	38	#define FLASH_PORT_WIDTH ushort
	39	#define FLASH_PORT_WIDTHV vu_short
	40	#define SWAP(x) __swab16(x)
	41	#else
	42	#define FLASH_PORT_WIDTH ulong
	43	#define FLASH_PORT_WIDTHV vu_long
	44	#define SWAP(x) __swab32(x)
	45	#endif
	46
	47	#define FPW FLASH_PORT_WIDTH
	48	#define FPWV FLASH_PORT_WIDTHV
	49
	50	#define mb() __asm__ __volatile__ ("" : : : "memory")
	51
	52	/*-----------------------------------------------------------------------
	53	* Functions
	54	*/
	55	static ulong flash_get_size (FPW addr, flash_info_t info);
	56	static int write_data (flash_info_t *info, ulong dest, FPW data);
	57	static void flash_get_offsets (ulong base, flash_info_t *info);
	58	void inline spin_wheel (void);
	59
	60	/*-----------------------------------------------------------------------
	61	*/
	62
	63	unsigned long flash_init (void)
	64	{
	65	int i;
	66	ulong size = 0;
	67
6d0f6bcf	68	for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
fabd46ac WD	69	switch (i) {
	70	case 0:
	71	flash_get_size ((FPW *) PHYS_FLASH_1, &flash_info[i]);
	72	flash_get_offsets (PHYS_FLASH_1, &flash_info[i]);
	73	break;
	74	case 1:
	75	flash_get_size ((FPW *) PHYS_FLASH_2, &flash_info[i]);
	76	flash_get_offsets (PHYS_FLASH_2, &flash_info[i]);
	77	break;
	78	default:
	79	panic ("configured too many flash banks!\n");
	80	break;
	81	}
	82	size += flash_info[i].size;
	83	}
	84
	85	/* Protect monitor and environment sectors
	86	*/
	87	flash_protect ( FLAG_PROTECT_SET,
6d0f6bcf JCPV	88	CONFIG_SYS_FLASH_BASE,
6d0f6bcf JCPV	89	CONFIG_SYS_FLASH_BASE + monitor_flash_len - 1,
fabd46ac WD	90	&flash_info[0] );
	91
	92	flash_protect ( FLAG_PROTECT_SET,
0e8d1586 JCPV	93	CONFIG_ENV_ADDR,
0e8d1586 JCPV	94	CONFIG_ENV_ADDR + CONFIG_ENV_SIZE - 1, &flash_info[0] );
fabd46ac WD	95
	96	return size;
	97	}
	98
	99	/*-----------------------------------------------------------------------
	100	*/
	101	static void flash_get_offsets (ulong base, flash_info_t *info)
	102	{
	103	int i;
	104
	105	if (info->flash_id == FLASH_UNKNOWN) {
	106	return;
	107	}
	108
	109	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL) {
	110	for (i = 0; i < info->sector_count; i++) {
	111	info->start[i] = base + (i * PHYS_FLASH_SECT_SIZE);
	112	info->protect[i] = 0;
	113	}
	114	}
	115	}
	116
	117	/*-----------------------------------------------------------------------
	118	*/
	119	void flash_print_info (flash_info_t *info)
	120	{
	121	int i;
	122
	123	if (info->flash_id == FLASH_UNKNOWN) {
	124	printf ("missing or unknown FLASH type\n");
	125	return;
	126	}
	127
	128	switch (info->flash_id & FLASH_VENDMASK) {
	129	case FLASH_MAN_INTEL:
	130	printf ("INTEL ");
	131	break;
	132	default:
	133	printf ("Unknown Vendor ");
	134	break;
	135	}
	136
	137	switch (info->flash_id & FLASH_TYPEMASK) {
	138	case FLASH_28F128J3A:
	139	printf ("28F128J3A\n");
	140	break;
	141	default:
	142	printf ("Unknown Chip Type\n");
	143	break;
	144	}
	145
	146	printf (" Size: %ld MB in %d Sectors\n",
	147	info->size >> 20, info->sector_count);
	148
	149	printf (" Sector Start Addresses:");
	150	for (i = 0; i < info->sector_count; ++i) {
	151	if ((i % 5) == 0)
	152	printf ("\n ");
	153	printf (" %08lX%s",
	154	info->start[i],
	155	info->protect[i] ? " (RO)" : " ");
	156	}
	157	printf ("\n");
	158	return;
159	}
160
161	/*
162	* The following code cannot be run from FLASH!
163	*/
164	static ulong flash_get_size (FPW addr, flash_info_t info)
165	{
166	volatile FPW value;
167
168	/* Write auto select command: read Manufacturer ID */
169	addr[0x5555] = (FPW) 0x00AA00AA;
170	addr[0x2AAA] = (FPW) 0x00550055;
171	addr[0x5555] = (FPW) 0x00900090;
172
173	mb ();
174	value = addr[0];
175
176	switch (value) {
177
178	case (FPW) INTEL_MANUFACT:
179	info->flash_id = FLASH_MAN_INTEL;
180	break;
181
182	default:
183	info->flash_id = FLASH_UNKNOWN;
184	info->sector_count = 0;
185	info->size = 0;
186	addr[0] = (FPW) 0x00FF00FF; /* restore read mode */
187	return (0); /* no or unknown flash */
188	}
189
190	mb ();
191	value = addr[1]; /* device ID */
192
193	switch (value) {
194
195	case (FPW) INTEL_ID_28F128J3A:
196	info->flash_id += FLASH_28F128J3A;
197	info->sector_count = 128;
198	info->size = 0x02000000;
199	break; /* => 16 MB */
200
201	default:
202	info->flash_id = FLASH_UNKNOWN;
203	break;
204	}
205
6d0f6bcf	206	if (info->sector_count > CONFIG_SYS_MAX_FLASH_SECT) {
fabd46ac	207	printf (" ERROR: sector count %d > max (%d) \n",
6d0f6bcf JCPV	208	info->sector_count, CONFIG_SYS_MAX_FLASH_SECT);
6d0f6bcf JCPV	209	info->sector_count = CONFIG_SYS_MAX_FLASH_SECT;
fabd46ac WD	210	}
	211
	212	addr[0] = (FPW) 0x00FF00FF; /* restore read mode */
	213
	214	return (info->size);
	215	}
	216
	217
	218	/*-----------------------------------------------------------------------
	219	*/
	220
	221	int flash_erase (flash_info_t *info, int s_first, int s_last)
	222	{
	223	int flag, prot, sect;
	224	ulong type, start, last;
	225	int rcode = 0;
	226
	227	if ((s_first < 0) \|\| (s_first > s_last)) {
	228	if (info->flash_id == FLASH_UNKNOWN) {
	229	printf ("- missing\n");
	230	} else {
	231	printf ("- no sectors to erase\n");
	232	}
	233	return 1;
	234	}
	235
	236	type = (info->flash_id & FLASH_VENDMASK);
	237	if ((type != FLASH_MAN_INTEL)) {
	238	printf ("Can't erase unknown flash type %08lx - aborted\n",
	239	info->flash_id);
	240	return 1;
	241	}
	242
	243	prot = 0;
	244	for (sect = s_first; sect <= s_last; ++sect) {
	245	if (info->protect[sect]) {
	246	prot++;
	247	}
	248	}
	249
	250	if (prot) {
	251	printf ("- Warning: %d protected sectors will not be erased!\n",
	252	prot);
	253	} else {
	254	printf ("\n");
	255	}
	256
	257	start = get_timer (0);
	258	last = start;
	259
	260	/* Disable interrupts which might cause a timeout here */
	261	flag = disable_interrupts ();
	262
	263	/* Start erase on unprotected sectors */
	264	for (sect = s_first; sect <= s_last; sect++) {
	265	if (info->protect[sect] == 0) { /* not protected */
	266	FPWV addr = (FPWV ) (info->start[sect]);
	267	FPW status;
	268
	269	printf ("Erasing sector %2d ... ", sect);
	270
	271	/* arm simple, non interrupt dependent timer */
	272	reset_timer_masked ();
	273
274	addr = (FPW) 0x00500050; / clear status register */
275	addr = (FPW) 0x00200020; / erase setup */
276	addr = (FPW) 0x00D000D0; / erase confirm */
277
278	while (((status = *addr) & (FPW) 0x00800080) != (FPW) 0x00800080) {
6d0f6bcf	279	if (get_timer_masked () > CONFIG_SYS_FLASH_ERASE_TOUT) {
fabd46ac WD	280	printf ("Timeout\n");
	281	addr = (FPW) 0x00B000B0; / suspend erase */
	282	addr = (FPW) 0x00FF00FF; / reset to read mode */
	283	rcode = 1;
	284	break;
	285	}
	286	}
	287
	288	addr = 0x00500050; / clear status register cmd. */
	289	addr = 0x00FF00FF; / resest to read mode */
	290
	291	printf (" done\n");
	292	}
	293	}
	294	return rcode;
	295	}
	296
	297	/*-----------------------------------------------------------------------
	298	* Copy memory to flash, returns:
	299	* 0 - OK
	300	* 1 - write timeout
	301	* 2 - Flash not erased
	302	* 4 - Flash not identified
	303	*/
	304
	305	int write_buff (flash_info_t info, uchar src, ulong addr, ulong cnt)
	306	{
	307	ulong cp, wp;
	308	FPW data;
	309	int count, i, l, rc, port_width;
	310
	311	if (info->flash_id == FLASH_UNKNOWN) {
	312	return 4;
	313	}
	314	/* get lower word aligned address */
	315	#ifdef FLASH_PORT_WIDTH16
	316	wp = (addr & ~1);
	317	port_width = 2;
	318	#else
	319	wp = (addr & ~3);
	320	port_width = 4;
	321	#endif
	322
	323	/*
	324	* handle unaligned start bytes
	325	*/
	326	if ((l = addr - wp) != 0) {
	327	data = 0;
	328	for (i = 0, cp = wp; i < l; ++i, ++cp) {
	329	data = (data << 8) \| ((uchar ) cp);
	330	}
	331	for (; i < port_width && cnt > 0; ++i) {
	332	data = (data << 8) \| *src++;
	333	--cnt;
	334	++cp;
	335	}
	336	for (; cnt == 0 && i < port_width; ++i, ++cp) {
	337	data = (data << 8) \| ((uchar ) cp);
	338	}
	339
	340	if ((rc = write_data (info, wp, SWAP (data))) != 0) {
	341	return (rc);
	342	}
	343	wp += port_width;
344	}
345
346	/*
347	* handle word aligned part
348	*/
349	count = 0;
350	while (cnt >= port_width) {
351	data = 0;
352	for (i = 0; i < port_width; ++i) {
353	data = (data << 8) \| *src++;
354	}
355	if ((rc = write_data (info, wp, SWAP (data))) != 0) {
356	return (rc);
357	}
358	wp += port_width;
359	cnt -= port_width;
360	if (count++ > 0x800) {
361	spin_wheel ();
362	count = 0;
363	}
364	}
365
366	if (cnt == 0) {
367	return (0);
368	}
369
370	/*
371	* handle unaligned tail bytes
372	*/
373	data = 0;
374	for (i = 0, cp = wp; i < port_width && cnt > 0; ++i, ++cp) {
375	data = (data << 8) \| *src++;
376	--cnt;
377	}
378	for (; i < port_width; ++i, ++cp) {
379	data = (data << 8) \| ((uchar ) cp);
380	}
381
382	return (write_data (info, wp, SWAP (data)));
383	}
384
385	/*-----------------------------------------------------------------------
386	* Write a word or halfword to Flash, returns:
387	* 0 - OK
388	* 1 - write timeout
389	* 2 - Flash not erased
390	*/
391	static int write_data (flash_info_t *info, ulong dest, FPW data)
392	{
393	FPWV addr = (FPWV ) dest;
394	ulong status;
395	int flag;
396
397	/* Check if Flash is (sufficiently) erased */
398	if ((*addr & data) != data) {
399	printf ("not erased at %08lx (%lx)\n", (ulong) addr, *addr);
400	return (2);
401	}
402	/* Disable interrupts which might cause a timeout here */
403	flag = disable_interrupts ();
404
405	addr = (FPW) 0x00400040; / write setup */
406	*addr = data;
407
408	/* arm simple, non interrupt dependent timer */
409	reset_timer_masked ();
410
411	/* wait while polling the status register */
412	while (((status = *addr) & (FPW) 0x00800080) != (FPW) 0x00800080) {
6d0f6bcf	413	if (get_timer_masked () > CONFIG_SYS_FLASH_WRITE_TOUT) {
fabd46ac WD	414	addr = (FPW) 0x00FF00FF; / restore read mode */
	415	return (1);
	416	}
	417	}
	418
	419	addr = (FPW) 0x00FF00FF; / restore read mode */
	420
	421	return (0);
	422	}
	423
	424	void inline spin_wheel (void)
	425	{
	426	static int p = 0;
	427	static char w[] = "\\/-";
	428
	429	printf ("\010%c", w[p]);
	430	(++p == 3) ? (p = 0) : 0;
	431	}