[people/ms/u-boot.git] / board / cray / L1 / flash.c

/*
 * (C) Copyright 2000
 * 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
 */

/*
 * Modified 4/5/2001
 * Wait for completion of each sector erase command issued
 * 4/5/2001
 * Chris Hallinan - DS4.COM, Inc. - clh@net1plus.com
 */

/*
 * Modified July 20, 2001
 * Strip down to support ONLY the AMD29F032B.
 * Dave Updegraff - Cray, Inc. dave@cray.com
 */

#include <common.h>
#include <ppc4xx.h>
#include <asm/processor.h>

/* The flash chip we use... */
#define AMD_ID_F032B	0x41	/* 29F032B ID  32 Mbit,64 64Kx8 sectors */
#define FLASH_AM320B    0x0009


flash_info_t	flash_info[CONFIG_SYS_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);

#define ADDR0           0x5555
#define ADDR1           0x2aaa
#define FLASH_WORD_SIZE unsigned char

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

unsigned long flash_init (void)
{
	unsigned long size_b0, size_b1;
	int i;

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

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

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

	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);
	}

	/* Only one bank */
	if (CONFIG_SYS_MAX_FLASH_BANKS == 1)
	  {
	    /* Setup offsets */
	    flash_get_offsets (FLASH_BASE0_PRELIM, &flash_info[0]);

#if 0
	    /* Monitor protection ON by default */
	    (void)flash_protect(FLAG_PROTECT_SET,
				FLASH_BASE0_PRELIM,
				FLASH_BASE0_PRELIM+monitor_flash_len-1,
				&flash_info[0]);
#endif
	    size_b1 = 0 ;
	    flash_info[0].size = size_b0;
	  }

	return (size_b0 + size_b1);
}


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

	/* set up sector start address table */
	for (i = 0; i < info->sector_count; i++)
		info->start[i] = base + (i * 0x00010000);
}

/*-----------------------------------------------------------------------
 */
void flash_print_info  (flash_info_t *info)
{
	int i;
	int k;
	int size;
	int erased;
	volatile unsigned long *flash;

	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;
	default:		printf ("Unknown Vendor ");	break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_AM320B:printf ("AM29F032B (32 Mbit 64x64KB uniform sectors)\n");
				break;
	default:		printf ("Unknown Chip Type\n");
				break;
	}

	printf ("  Size: %ld KB in %d Sectors\n",
		info->size >> 10, info->sector_count);

	printf ("  Sector Start Addresses:");
	for (i=0; i<info->sector_count; ++i) {
		/*
		 * Check if whole sector is erased
		 */
		if (i != (info->sector_count-1))
		  size = info->start[i+1] - info->start[i];
		else
		  size = info->start[0] + info->size - info->start[i];
		erased = 1;
		flash = (volatile unsigned long *)info->start[i];
		size = size >> 2;        /* divide by 4 for longword access */
		for (k=0; k<size; k++)
		  {
		    if (*flash++ != 0xffffffff)
		      {
			erased = 0;
			break;
		      }
		  }

		if ((i % 5) == 0)
			printf ("\n   ");

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

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


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

/*
 * The following code cannot be run from FLASH!
 */
static ulong flash_get_size (vu_long *addr, flash_info_t *info)
{
	short i;
	FLASH_WORD_SIZE value;
	ulong base = (ulong)addr;
	volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *)addr;

	/* Write auto select command: read Manufacturer ID */
	addr2[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
	addr2[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
	addr2[ADDR0] = (FLASH_WORD_SIZE)0x00900090;

	value = addr2[0];

	switch (value) {
	case (FLASH_WORD_SIZE)AMD_MANUFACT:
		info->flash_id = FLASH_MAN_AMD;
		break;
	default:
		info->flash_id = FLASH_UNKNOWN;
		info->sector_count = 0;
		info->size = 0;
		return (0);			/* no or unknown flash	*/
	}

	value = addr2[1];			/* device ID		*/

	switch (value) {
	case (FLASH_WORD_SIZE)AMD_ID_F032B:
		info->flash_id += FLASH_AM320B;
		info->sector_count = 64;
		info->size = 0x0400000; /* => 4 MB */
		break;
	default:
		info->flash_id = FLASH_UNKNOWN;
		return (0);			/* => no or unknown flash */

	}

	/* set up sector start address table */
	for (i = 0; i < info->sector_count; i++)
		info->start[i] = base + (i * 0x00010000);

	/* 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 */
		addr2 = (volatile FLASH_WORD_SIZE *)(info->start[i]);
	info->protect[i] = addr2[2] & 1;
	}

	/*
	 * Prevent writes to uninitialized FLASH.
	 */
	if (info->flash_id != FLASH_UNKNOWN) {
		addr2 = (FLASH_WORD_SIZE *)info->start[0];
		*addr2 = (FLASH_WORD_SIZE)0x00F000F0;	/* reset bank */
	}

	return (info->size);
}

int wait_for_DQ7(flash_info_t *info, int sect)
{
	ulong start, now, last;
	volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *)(info->start[sect]);

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

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

int	flash_erase (flash_info_t *info, int s_first, int s_last)
{
	volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *)(info->start[0]);
	volatile FLASH_WORD_SIZE *addr2;
	int flag, prot, sect, l_sect;

	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) {
		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();

	/* Start erase on unprotected sectors */
	for (sect = s_first; sect<=s_last; sect++) {
		if (info->protect[sect] == 0) {	/* not protected */
		    addr2 = (FLASH_WORD_SIZE *)(info->start[sect]);
		    printf("Erasing sector %p\n", addr2);

			addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
			addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
			addr[ADDR0] = (FLASH_WORD_SIZE)0x00800080;
			addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
			addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
			addr2[0] = (FLASH_WORD_SIZE)0x00300030;  /* sector erase */
		    l_sect = sect;
		    /*
		     * Wait for each sector to complete, it's more
		     * reliable.  According to AMD Spec, you must
		     * issue all erase commands within a specified
		     * timeout.  This has been seen to fail, especially
		     * if printf()s are included (for debug)!!
		     */
		    wait_for_DQ7(info, sect);
		}
	}

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

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

	/* reset to read mode */
	addr = (FLASH_WORD_SIZE *)info->start[0];
	addr[0] = (FLASH_WORD_SIZE)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)
{
	volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *)(info->start[0]);
	volatile FLASH_WORD_SIZE *dest2 = (FLASH_WORD_SIZE *)dest;
	volatile FLASH_WORD_SIZE *data2 = (FLASH_WORD_SIZE *)&data;
	ulong start;
	int flag;
	int i;

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

	for (i=0; i<4/sizeof(FLASH_WORD_SIZE); i++)
	  {
	    addr2[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
	    addr2[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
	    addr2[ADDR0] = (FLASH_WORD_SIZE)0x00A000A0;

	    dest2[i] = data2[i];

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

	    /* data polling for D7 */
	    start = get_timer (0);
	    while ((dest2[i] & (FLASH_WORD_SIZE)0x00800080) !=
		   (data2[i] & (FLASH_WORD_SIZE)0x00800080)) {
	      if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
		return (1);
	      }
	    }
	  }

	return (0);
}

/*-----------------------------------------------------------------------
 */
Commit	Line	Data
fe8c2806 WD	1	/*
	2	* (C) Copyright 2000
	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
	24	/*
	25	* Modified 4/5/2001
	26	* Wait for completion of each sector erase command issued
	27	* 4/5/2001
	28	* Chris Hallinan - DS4.COM, Inc. - clh@net1plus.com
	29	*/
	30
	31	/*
	32	* Modified July 20, 2001
	33	* Strip down to support ONLY the AMD29F032B.
	34	* Dave Updegraff - Cray, Inc. dave@cray.com
	35	*/
	36
	37	#include <common.h>
	38	#include <ppc4xx.h>
	39	#include <asm/processor.h>
	40
	41	/* The flash chip we use... */
	42	#define AMD_ID_F032B 0x41 /* 29F032B ID 32 Mbit,64 64Kx8 sectors */
	43	#define FLASH_AM320B 0x0009
	44
	45
6d0f6bcf	46	flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS]; /* info for FLASH chips */
fe8c2806 WD	47
	48	/*-----------------------------------------------------------------------
	49	* Functions
	50	*/
	51	static ulong flash_get_size (vu_long addr, flash_info_t info);
	52	static int write_word (flash_info_t *info, ulong dest, ulong data);
	53	static void flash_get_offsets (ulong base, flash_info_t *info);
	54
	55	#define ADDR0 0x5555
	56	#define ADDR1 0x2aaa
	57	#define FLASH_WORD_SIZE unsigned char
	58
	59	/*-----------------------------------------------------------------------
	60	*/
	61
	62	unsigned long flash_init (void)
	63	{
	64	unsigned long size_b0, size_b1;
	65	int i;
	66
	67	/* Init: no FLASHes known */
6d0f6bcf	68	for (i=0; i<CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
fe8c2806 WD	69	flash_info[i].flash_id = FLASH_UNKNOWN;
	70	}
	71
	72	/* Static FLASH Bank configuration here - FIXME XXX */
	73
	74	size_b0 = flash_get_size((vu_long *)FLASH_BASE0_PRELIM, &flash_info[0]);
	75
	76	if (flash_info[0].flash_id == FLASH_UNKNOWN) {
	77	printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
	78	size_b0, size_b0<<20);
	79	}
	80
	81	/* Only one bank */
6d0f6bcf	82	if (CONFIG_SYS_MAX_FLASH_BANKS == 1)
fe8c2806 WD	83	{
	84	/* Setup offsets */
	85	flash_get_offsets (FLASH_BASE0_PRELIM, &flash_info[0]);
	86
	87	#if 0
	88	/* Monitor protection ON by default */
	89	(void)flash_protect(FLAG_PROTECT_SET,
	90	FLASH_BASE0_PRELIM,
3b57fe0a	91	FLASH_BASE0_PRELIM+monitor_flash_len-1,
fe8c2806 WD	92	&flash_info[0]);
	93	#endif
	94	size_b1 = 0 ;
	95	flash_info[0].size = size_b0;
	96	}
	97
	98	return (size_b0 + size_b1);
	99	}
	100
	101
fe8c2806 WD	102	/*-----------------------------------------------------------------------
	103	*/
	104	static void flash_get_offsets (ulong base, flash_info_t *info)
	105	{
	106	int i;
	107
	108	/* set up sector start address table */
	109	for (i = 0; i < info->sector_count; i++)
	110	info->start[i] = base + (i * 0x00010000);
	111	}
	112
	113	/*-----------------------------------------------------------------------
	114	*/
	115	void flash_print_info (flash_info_t *info)
	116	{
	117	int i;
8bde7f77 WD	118	int k;
	119	int size;
	120	int erased;
	121	volatile unsigned long *flash;
fe8c2806 WD	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_AMD: printf ("AMD "); break;
	130	default: printf ("Unknown Vendor "); break;
	131	}
	132
	133	switch (info->flash_id & FLASH_TYPEMASK) {
	134	case FLASH_AM320B:printf ("AM29F032B (32 Mbit 64x64KB uniform sectors)\n");
	135	break;
	136	default: printf ("Unknown Chip Type\n");
	137	break;
	138	}
	139
	140	printf (" Size: %ld KB in %d Sectors\n",
	141	info->size >> 10, info->sector_count);
	142
	143	printf (" Sector Start Addresses:");
	144	for (i=0; i<info->sector_count; ++i) {
8bde7f77 WD	145	/*
	146	* Check if whole sector is erased
	147	*/
	148	if (i != (info->sector_count-1))
	149	size = info->start[i+1] - info->start[i];
	150	else
	151	size = info->start[0] + info->size - info->start[i];
	152	erased = 1;
	153	flash = (volatile unsigned long *)info->start[i];
	154	size = size >> 2; /* divide by 4 for longword access */
	155	for (k=0; k<size; k++)
	156	{
	157	if (*flash++ != 0xffffffff)
	158	{
	159	erased = 0;
	160	break;
	161	}
	162	}
fe8c2806 WD	163
	164	if ((i % 5) == 0)
	165	printf ("\n ");
	166
	167	printf (" %08lX%s%s",
	168	info->start[i],
	169	erased ? " E" : " ",
	170	info->protect[i] ? "RO " : " "
	171	);
	172	}
	173	printf ("\n");
	174	}
	175
	176	/*-----------------------------------------------------------------------
	177	*/
	178
	179
	180	/*-----------------------------------------------------------------------
	181	*/
	182
	183	/*
	184	* The following code cannot be run from FLASH!
	185	*/
	186	static ulong flash_get_size (vu_long addr, flash_info_t info)
	187	{
	188	short i;
	189	FLASH_WORD_SIZE value;
	190	ulong base = (ulong)addr;
8bde7f77	191	volatile FLASH_WORD_SIZE addr2 = (FLASH_WORD_SIZE )addr;
fe8c2806 WD	192
	193	/* Write auto select command: read Manufacturer ID */
	194	addr2[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
	195	addr2[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
	196	addr2[ADDR0] = (FLASH_WORD_SIZE)0x00900090;
	197
	198	value = addr2[0];
	199
	200	switch (value) {
	201	case (FLASH_WORD_SIZE)AMD_MANUFACT:
	202	info->flash_id = FLASH_MAN_AMD;
	203	break;
	204	default:
	205	info->flash_id = FLASH_UNKNOWN;
	206	info->sector_count = 0;
	207	info->size = 0;
	208	return (0); /* no or unknown flash */
	209	}
	210
	211	value = addr2[1]; /* device ID */
	212
	213	switch (value) {
	214	case (FLASH_WORD_SIZE)AMD_ID_F032B:
	215	info->flash_id += FLASH_AM320B;
	216	info->sector_count = 64;
	217	info->size = 0x0400000; /* => 4 MB */
	218	break;
	219	default:
	220	info->flash_id = FLASH_UNKNOWN;
	221	return (0); /* => no or unknown flash */
	222
	223	}
	224
	225	/* set up sector start address table */
	226	for (i = 0; i < info->sector_count; i++)
	227	info->start[i] = base + (i * 0x00010000);
	228
	229	/* check for protected sectors */
	230	for (i = 0; i < info->sector_count; i++) {
	231	/* read sector protection at sector address, (A7 .. A0) = 0x02 */
	232	/* D0 = 1 if protected */
	233	addr2 = (volatile FLASH_WORD_SIZE *)(info->start[i]);
8bde7f77	234	info->protect[i] = addr2[2] & 1;
fe8c2806 WD	235	}
	236
	237	/*
	238	* Prevent writes to uninitialized FLASH.
	239	*/
	240	if (info->flash_id != FLASH_UNKNOWN) {
	241	addr2 = (FLASH_WORD_SIZE *)info->start[0];
	242	addr2 = (FLASH_WORD_SIZE)0x00F000F0; / reset bank */
	243	}
	244
	245	return (info->size);
	246	}
	247
	248	int wait_for_DQ7(flash_info_t *info, int sect)
	249	{
	250	ulong start, now, last;
	251	volatile FLASH_WORD_SIZE addr = (FLASH_WORD_SIZE )(info->start[sect]);
	252
	253	start = get_timer (0);
	254	last = start;
	255	while ((addr[0] & (FLASH_WORD_SIZE)0x00800080) != (FLASH_WORD_SIZE)0x00800080) {
6d0f6bcf	256	if ((now = get_timer(start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
8bde7f77 WD	257	printf ("Timeout\n");
	258	return -1;
	259	}
	260	/* show that we're waiting */
	261	if ((now - last) > 1000) { /* every second */
	262	putc ('.');
	263	last = now;
	264	}
fe8c2806 WD	265	}
	266	return 0;
	267	}
	268
	269	/*-----------------------------------------------------------------------
	270	*/
	271
	272	int flash_erase (flash_info_t *info, int s_first, int s_last)
	273	{
	274	volatile FLASH_WORD_SIZE addr = (FLASH_WORD_SIZE )(info->start[0]);
	275	volatile FLASH_WORD_SIZE *addr2;
	276	int flag, prot, sect, l_sect;
	277
	278	if ((s_first < 0) \|\| (s_first > s_last)) {
	279	if (info->flash_id == FLASH_UNKNOWN) {
	280	printf ("- missing\n");
	281	} else {
	282	printf ("- no sectors to erase\n");
	283	}
	284	return 1;
	285	}
	286
	287	if (info->flash_id == FLASH_UNKNOWN) {
	288	printf ("Can't erase unknown flash type - aborted\n");
	289	return 1;
	290	}
	291
	292	prot = 0;
	293	for (sect=s_first; sect<=s_last; ++sect) {
	294	if (info->protect[sect]) {
	295	prot++;
	296	}
	297	}
	298
	299	if (prot) {
	300	printf ("- Warning: %d protected sectors will not be erased!\n",
	301	prot);
	302	} else {
	303	printf ("\n");
	304	}
	305
	306	l_sect = -1;
	307
	308	/* Disable interrupts which might cause a timeout here */
	309	flag = disable_interrupts();
	310
	311	/* Start erase on unprotected sectors */
	312	for (sect = s_first; sect<=s_last; sect++) {
	313	if (info->protect[sect] == 0) { /* not protected */
	314	addr2 = (FLASH_WORD_SIZE *)(info->start[sect]);
	315	printf("Erasing sector %p\n", addr2);
	316
	317	addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
	318	addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
	319	addr[ADDR0] = (FLASH_WORD_SIZE)0x00800080;
	320	addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
	321	addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
	322	addr2[0] = (FLASH_WORD_SIZE)0x00300030; /* sector erase */
	323	l_sect = sect;
	324	/*
	325	* Wait for each sector to complete, it's more
	326	* reliable. According to AMD Spec, you must
	327	* issue all erase commands within a specified
	328	* timeout. This has been seen to fail, especially
329	* if printf()s are included (for debug)!!
330	*/
331	wait_for_DQ7(info, sect);
332	}
333	}
334
335	/* re-enable interrupts if necessary */
336	if (flag)
337	enable_interrupts();
338
339	/* wait at least 80us - let's wait 1 ms */
340	udelay (1000);
341
342	/* reset to read mode */
343	addr = (FLASH_WORD_SIZE *)info->start[0];
344	addr[0] = (FLASH_WORD_SIZE)0x00F000F0; /* reset bank */
345
346	printf (" done\n");
347	return 0;
348	}
349
350	/*-----------------------------------------------------------------------
351	* Copy memory to flash, returns:
352	* 0 - OK
353	* 1 - write timeout
354	* 2 - Flash not erased
355	*/
356
357	int write_buff (flash_info_t info, uchar src, ulong addr, ulong cnt)
358	{
359	ulong cp, wp, data;
360	int i, l, rc;
361
362	wp = (addr & ~3); /* get lower word aligned address */
363
364	/*
365	* handle unaligned start bytes
366	*/
367	if ((l = addr - wp) != 0) {
368	data = 0;
369	for (i=0, cp=wp; i<l; ++i, ++cp) {
370	data = (data << 8) \| ((uchar )cp);
371	}
372	for (; i<4 && cnt>0; ++i) {
373	data = (data << 8) \| *src++;
374	--cnt;
375	++cp;
376	}
377	for (; cnt==0 && i<4; ++i, ++cp) {
378	data = (data << 8) \| ((uchar )cp);
379	}
380
381	if ((rc = write_word(info, wp, data)) != 0) {
382	return (rc);
383	}
384	wp += 4;
385	}
386
387	/*
388	* handle word aligned part
389	*/
390	while (cnt >= 4) {
391	data = 0;
392	for (i=0; i<4; ++i) {
393	data = (data << 8) \| *src++;
394	}
395	if ((rc = write_word(info, wp, data)) != 0) {
396	return (rc);
397	}
398	wp += 4;
399	cnt -= 4;
400	}
401
402	if (cnt == 0) {
403	return (0);
404	}
405
406	/*
407	* handle unaligned tail bytes
408	*/
409	data = 0;
410	for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
411	data = (data << 8) \| *src++;
412	--cnt;
413	}
414	for (; i<4; ++i, ++cp) {
415	data = (data << 8) \| ((uchar )cp);
416	}
417
418	return (write_word(info, wp, data));
419	}
420
421	/*-----------------------------------------------------------------------
422	* Write a word to Flash, returns:
423	* 0 - OK
424	* 1 - write timeout
425	* 2 - Flash not erased
426	*/
427	static int write_word (flash_info_t *info, ulong dest, ulong data)
428	{
8bde7f77 WD	429	volatile FLASH_WORD_SIZE addr2 = (FLASH_WORD_SIZE )(info->start[0]);
	430	volatile FLASH_WORD_SIZE dest2 = (FLASH_WORD_SIZE )dest;
	431	volatile FLASH_WORD_SIZE data2 = (FLASH_WORD_SIZE )&data;
fe8c2806 WD	432	ulong start;
fe8c2806 WD	433	int flag;
8bde7f77	434	int i;
fe8c2806 WD	435
	436	/* Check if Flash is (sufficiently) erased */
	437	if ((((volatile FLASH_WORD_SIZE )dest) &
8bde7f77	438	(FLASH_WORD_SIZE)data) != (FLASH_WORD_SIZE)data) {
fe8c2806 WD	439	return (2);
	440	}
	441	/* Disable interrupts which might cause a timeout here */
	442	flag = disable_interrupts();
	443
8bde7f77 WD	444	for (i=0; i<4/sizeof(FLASH_WORD_SIZE); i++)
	445	{
	446	addr2[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
	447	addr2[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
	448	addr2[ADDR0] = (FLASH_WORD_SIZE)0x00A000A0;
	449
	450	dest2[i] = data2[i];
	451
	452	/* re-enable interrupts if necessary */
	453	if (flag)
	454	enable_interrupts();
	455
	456	/* data polling for D7 */
	457	start = get_timer (0);
	458	while ((dest2[i] & (FLASH_WORD_SIZE)0x00800080) !=
	459	(data2[i] & (FLASH_WORD_SIZE)0x00800080)) {
6d0f6bcf	460	if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
8bde7f77 WD	461	return (1);
	462	}
	463	}
	464	}
fe8c2806 WD	465
	466	return (0);
	467	}
	468
	469	/*-----------------------------------------------------------------------
	470	*/