flash.c

u-boot-1.1.6 源码包

	case (INTEL_ID_28F320B3B & FLASH_ID_MASK):
		info->flash_id += FLASH_AM320B;
		info->sector_count = 135;
		info->size = 0x01000000;
		break;		/* => 16 MB             */
#endif
	case (INTEL_ID_28F320J3A & FLASH_ID_MASK):
		info->flash_id += FLASH_28F320J3A;
		info->sector_count = 32;
		info->size = 0x00400000;
		break;		/* => 32 MBit   */
	case (INTEL_ID_28F640J3A & FLASH_ID_MASK):
		info->flash_id += FLASH_28F640J3A;
		info->sector_count = 64;
		info->size = 0x00800000;
		break;		/* => 64 MBit   */
	case (INTEL_ID_28F128J3A & FLASH_ID_MASK):
		info->flash_id += FLASH_28F128J3A;
		info->sector_count = 128;
		info->size = 0x01000000;
		break;		/* => 128 MBit          */

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

	flash_get_offsets (base, info);

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

	/*
	 * Prevent writes to uninitialized FLASH.
	 */
	if (info->flash_id != FLASH_UNKNOWN) {
		addr = (volatile FLASH_WORD_SIZE *) info->start[0];
		if ((info->flash_id & 0xFF00) == FLASH_MAN_INTEL) {
			*addr = (0x00F000F0 & FLASH_ID_MASK);	/* reset bank */
		} else {
			*addr = (0x00FF00FF & FLASH_ID_MASK);	/* reset bank */
		}
	}

	return (info->size);
}


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

int flash_erase (flash_info_t * info, int s_first, int s_last)
{

	volatile FLASH_WORD_SIZE *addr =
		(volatile FLASH_WORD_SIZE *) (info->start[0]);
	int flag, prot, sect, l_sect, barf;
	ulong start, now, 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;
	}

	if ((info->flash_id == FLASH_UNKNOWN) ||
	    ((info->flash_id > FLASH_AMD_COMP) &&
	     ((info->flash_id & FLASH_VENDMASK) != FLASH_MAN_INTEL))) {
		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 ();
	if (info->flash_id < FLASH_AMD_COMP) {
#ifndef CFG_FLASH_16BIT
		addr[0x0555] = 0x00AA00AA;
		addr[0x02AA] = 0x00550055;
		addr[0x0555] = 0x00800080;
		addr[0x0555] = 0x00AA00AA;
		addr[0x02AA] = 0x00550055;
#else
		addr[0x0555] = 0x00AA;
		addr[0x02AA] = 0x0055;
		addr[0x0555] = 0x0080;
		addr[0x0555] = 0x00AA;
		addr[0x02AA] = 0x0055;
#endif
		/* Start erase on unprotected sectors */
		for (sect = s_first; sect <= s_last; sect++) {
			if (info->protect[sect] == 0) {	/* not protected */
				addr = (volatile FLASH_WORD_SIZE *) (info->
								     start
								     [sect]);
				addr[0] = (0x00300030 & FLASH_ID_MASK);
				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 FLASH_WORD_SIZE *) (info->start[l_sect]);
		while ((addr[0] & (0x00800080 & FLASH_ID_MASK)) !=
		       (0x00800080 & FLASH_ID_MASK)) {
			if ((now = get_timer (start)) > CFG_FLASH_ERASE_TOUT) {
				printf ("Timeout\n");
				return 1;
			}
			/* show that we're waiting */
			if ((now - last) > 1000000) {	/* every second */
				serial_putc ('.');
				last = now;
			}
		}

	      DONE:
		/* reset to read mode */
		addr = (volatile FLASH_WORD_SIZE *) info->start[0];
		addr[0] = (0x00F000F0 & FLASH_ID_MASK);	/* reset bank */
	} else {


		for (sect = s_first; sect <= s_last; sect++) {
			if (info->protect[sect] == 0) {	/* not protected */
				barf = 0;
#ifndef CFG_FLASH_16BIT
				addr = (vu_long *) (info->start[sect]);
				addr[0] = 0x00500050;
				addr[0] = 0x00200020;
				addr[0] = 0x00D000D0;
				while (!(addr[0] & 0x00800080));	/* wait for error or finish */
				if (addr[0] & 0x003A003A) {	/* check for error */
					barf = addr[0] & 0x003A0000;
					if (barf) {
						barf >>= 16;
					} else {
						barf = addr[0] & 0x0000003A;
					}
				}
#else
				addr = (vu_short *) (info->start[sect]);
				addr[0] = 0x0050;	/* clear status register */
				addr[0] = 0x0020;
				addr[0] = 0x00D0;
				while (!(addr[0] & 0x0080));	/* wait for error or finish */
				if (addr[0] & 0x003A)	/* check for error */
					barf = addr[0] & 0x003A;
#endif
				if (barf) {
					printf ("\nFlash error in sector at %lx\n", (unsigned long) addr);
					if (barf & 0x0002)
						printf ("Block locked, not erased.\n");
					if ((barf & 0x0030) == 0x0030)
						printf ("Command Sequence error.\n");
					if ((barf & 0x0030) == 0x0020)
						printf ("Block Erase error.\n");
					if (barf & 0x0008)
						printf ("Vpp Low error.\n");
					rcode = 1;
				} else
					printf (".");
				l_sect = sect;
			}
			addr = (volatile FLASH_WORD_SIZE *) info->start[0];
#ifndef CFG_FLASH_16BIT
			addr[0] = (0x00FF00FF & FLASH_ID_MASK);	/* reset bank */
#else
			addr[0] = (0x00FF & FLASH_ID_MASK);	/* reset bank */
#endif
		}

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

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

/*flash_info_t *addr2info (ulong addr)
{
	flash_info_t *info;
	int i;

	for (i=0, info=&flash_info[0]; i<CFG_MAX_FLASH_BANKS; ++i, ++info) {
		if ((addr >= info->start[0]) &&
		    (addr < (info->start[0] + info->size)) ) {
			return (info);
		}
	}

	return (NULL);
}
*/
/*-----------------------------------------------------------------------
 * Copy memory to flash.
 * Make sure all target addresses are within Flash bounds,
 * and no protected sectors are hit.
 * Returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 * 4 - target range includes protected sectors
 * 8 - target address not in Flash memory
 */

/*int flash_write (uchar *src, ulong addr, ulong cnt)
{
	int i;
	ulong         end        = addr + cnt - 1;
	flash_info_t *info_first = addr2info (addr);
	flash_info_t *info_last  = addr2info (end );
	flash_info_t *info;

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

	if (!info_first || !info_last) {
		return (8);
	}

	for (info = info_first; info <= info_last; ++info) {
										ulong b_end = info->start[0] + info->size;*/ /* bank end addr */
/*		short s_end = info->sector_count - 1;
		for (i=0; i<info->sector_count; ++i) {
			ulong e_addr = (i == s_end) ? b_end : info->start[i + 1];

			if ((end >= info->start[i]) && (addr < e_addr) &&
			    (info->protect[i] != 0) ) {
				return (4);
			}
		}
	}

*/ /* finally write data to flash */
/*	for (info = info_first; info <= info_last && cnt>0; ++info) {
		ulong len;

		len = info->start[0] + info->size - addr;
		if (len > cnt)
			len = cnt;
		if ((i = write_buff(info, src, addr, len)) != 0) {
			return (i);
		}
		cnt  -= len;
		addr += len;
		src  += len;
	}
	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)
{
#ifndef CFG_FLASH_16BIT
	ulong cp, wp, data;
	int l;
#else
	ulong cp, wp;
	ushort data;
#endif
	int i, rc;

#ifndef CFG_FLASH_16BIT


	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));

#else
	wp = (addr & ~1);	/* get lower word aligned address */

	/*
	 * handle unaligned start byte
	 */
	if (addr - wp) {
		data = 0;
		data = (data << 8) | *src++;
		--cnt;
		if ((rc = write_short (info, wp, data)) != 0) {
			return (rc);
		}
		wp += 2;
	}

	/*
	 * handle word aligned part
	 */
/*	l = 0; used for debuging  */
	while (cnt >= 2) {
		data = 0;
		for (i = 0; i < 2; ++i) {
			data = (data << 8) | *src++;
		}

/*		if(!l){
			printf("%x",data);
			l = 1;
		}  used for debuging */

		if ((rc = write_short (info, wp, data)) != 0) {
			return (rc);
		}
		wp += 2;
		cnt -= 2;
	}

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

	/*
	 * handle unaligned tail bytes
	 */
	data = 0;
	for (i = 0, cp = wp; i < 2 && cnt > 0; ++i, ++cp) {
		data = (data << 8) | *src++;
		--cnt;
	}
	for (; i < 2; ++i, ++cp) {
		data = (data << 8) | (*(uchar *) cp);
	}

	return (write_short (info, wp, data));


#endif
}

/*-----------------------------------------------------------------------
 * Write a word to Flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 */
#ifndef CFG_FLASH_16BIT
static int write_word (flash_info_t * info, ulong dest, ulong data)
{
	vu_long *addr = (vu_long *) (info->start[0]);
	ulong start, barf;
	int flag;

#if defined (__MIPSEL__)
	data = cpu_to_be32 (data);
#endif

	/* 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 ();

	if (info->flash_id < FLASH_AMD_COMP) {
		/* AMD stuff */
		addr[0x0555] = 0x00AA00AA;
		addr[0x02AA] = 0x00550055;
		addr[0x0555] = 0x00A000A0;
	} else {
		/* intel stuff */
		*addr = 0x00400040;
	}

	*((vu_long *) dest) = data;

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

	/* data polling for D7 */
	start = get_timer (0);

	if (info->flash_id < FLASH_AMD_COMP) {

		while ((*((vu_long *) dest) & 0x00800080) !=
		       (data & 0x00800080)) {
			if (get_timer (start) > CFG_FLASH_WRITE_TOUT) {
				printf ("timeout\n");
				return (1);
			}
		}

	} else {

		while (!(addr[0] & 0x00800080)) {	/* wait for error or finish */
			if (get_timer (start) > CFG_FLASH_WRITE_TOUT) {
				printf ("timeout\n");
				return (1);
			}
		}

		if (addr[0] & 0x003A003A) {	/* check for error */
			barf = addr[0] & 0x003A0000;
			if (barf) {
				barf >>= 16;
			} else {
				barf = addr[0] & 0x0000003A;
			}
			printf ("\nFlash write error at address %lx\n",
				(unsigned long) dest);
			if (barf & 0x0002)
				printf ("Block locked, not erased.\n");
			if (barf & 0x0010)
				printf ("Programming error.\n");
			if (barf & 0x0008)
				printf ("Vpp Low error.\n");
			return (2);
		}


	}

	return (0);
}

#else

static int write_short (flash_info_t * info, ulong dest, ushort data)
{
	vu_short *addr = (vu_short *) (info->start[0]);
	ulong start, barf;
	int flag;

#if defined (__MIPSEL__)
	data = cpu_to_be16 (data);
#endif

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

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

	if (info->flash_id < FLASH_AMD_COMP) {
		/* AMD stuff */
		addr[0x0555] = 0x00AA;
		addr[0x02AA] = 0x0055;
		addr[0x0555] = 0x00A0;
	} else {
		/* intel stuff */
		*addr = 0x00D0;
		*addr = 0x0040;
	}
	*((vu_short *) dest) = data;

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

	/* data polling for D7 */
	start = get_timer (0);

	if (info->flash_id < FLASH_AMD_COMP) {
		/* AMD stuff */
		while ((*((vu_short *) dest) & 0x0080) != (data & 0x0080)) {
			if (get_timer (start) > CFG_FLASH_WRITE_TOUT) {
				return (1);
			}
		}

	} else {
		/* intel stuff */
		while (!(addr[0] & 0x0080)) {	/* wait for error or finish */
			if (get_timer (start) > CFG_FLASH_WRITE_TOUT)
				return (1);
		}

		if (addr[0] & 0x003A) {	/* check for error */
			barf = addr[0] & 0x003A;
			printf ("\nFlash write error at address %lx\n",
				(unsigned long) dest);
			if (barf & 0x0002)
				printf ("Block locked, not erased.\n");
			if (barf & 0x0010)
				printf ("Programming error.\n");
			if (barf & 0x0008)
				printf ("Vpp Low error.\n");
			return (2);
		}
		*addr = 0x00B0;
		*addr = 0x0070;
		while (!(addr[0] & 0x0080)) {	/* wait for error or finish */
			if (get_timer (start) > CFG_FLASH_WRITE_TOUT)
				return (1);
		}

		*addr = 0x00FF;

	}

	return (0);

}
#endif