flash.c

uboot在arm处理器s3c2410的移植代码

	saddr[0x0555] = 0x0090;

	value = saddr[0];

	DEBUGF("Manuf. ID @ 0x%08lx: 0x%04x\n", (ulong)addr, value);

	switch (value) {
	case (AMD_MANUFACT & 0xFFFF):
		info->flash_id = FLASH_MAN_AMD;
		break;
	case (FUJ_MANUFACT & 0xFFFF):
		info->flash_id = FLASH_MAN_FUJ;
		break;
	default:
		DEBUGF("Unknown Manufacturer ID\n");
		info->flash_id = FLASH_UNKNOWN;
		info->sector_count = 0;
		info->size = 0;
		return (0);			/* no or unknown flash	*/
	}

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

	DEBUGF("Device ID @ 0x%08lx: 0x%04x\n", (ulong)(&addr[1]), value);

	switch (value) {

	case (AMD_ID_DL322T & 0xFFFF):
		info->flash_id += FLASH_AMDL322T;
		info->sector_count = 71;
		info->size = 0x00400000;
		break;				/* => 8 MB		*/

	case (AMD_ID_DL322B & 0xFFFF):
		info->flash_id += FLASH_AMDL322B;
		info->sector_count = 71;
		info->size = 0x00400000;
		break;				/* => 8 MB		*/

	case (AMD_ID_DL323T & 0xFFFF):
		info->flash_id += FLASH_AMDL323T;
		info->sector_count = 71;
		info->size = 0x00400000;
		break;				/* => 8 MB		*/

	case (AMD_ID_DL323B & 0xFFFF):
		info->flash_id += FLASH_AMDL323B;
		info->sector_count = 71;
		info->size = 0x00400000;
		break;				/* => 8 MB		*/

	case (AMD_ID_DL324T & 0xFFFF):
		info->flash_id += FLASH_AMDL324T;
		info->sector_count = 71;
		info->size = 0x00400000;
		break;				/* => 8 MB		*/

	case (AMD_ID_DL324B & 0xFFFF):
		info->flash_id += FLASH_AMDL324B;
		info->sector_count = 71;
		info->size = 0x00400000;
		break;				/* => 8 MB		*/
	case (AMD_ID_DL640  & 0xFFFF):
		info->flash_id += FLASH_AMDL640;
		info->sector_count = 142;
		info->size = 0x00800000;
		break;
	default:
		DEBUGF("Unknown Device ID\n");
		info->flash_id = FLASH_UNKNOWN;
		return (0);			/* => no or unknown flash */

	}

	flash_get_offsets ((ulong)addr, info);

	/* check for protected sectors */
	for (i = 0; i < info->sector_count; i++) {
#if 0
		/* read sector protection at sector address, (A7 .. A0) = 0x02 */
		/* D0 = 1 if protected */
		saddr = (vu_short *)(info->start[i]);
		info->protect[i] = saddr[2] & 1;
#else
		info->protect[i] =0;
#endif
	}

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

	saddr = (vu_short *)info->start[0];
	*saddr = 0x00F0;	/* restore read mode */

	return (info->size);
}


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

int	flash_erase (flash_info_t *info, int s_first, int s_last)
{
	vu_short *addr = (vu_short*)(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 %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");
	}

	l_sect = -1;

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

	addr[0x0555] = 0x00AA;
	addr[0x02AA] = 0x0055;
	addr[0x0555] = 0x0080;
	addr[0x0555] = 0x00AA;
	addr[0x02AA] = 0x0055;

	/* Start erase on unprotected sectors */
	for (sect = s_first; sect<=s_last; sect++) {
		if (info->protect[sect] == 0) {	/* not protected */
			addr = (vu_short*)(info->start[sect]);
			addr[0] = 0x0030;
			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 = (vu_short*)(info->start[l_sect]);
	while ((addr[0] & 0x0080) != 0x0080) {
		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 = (vu_short *)info->start[0];
	addr[0] = 0x00F0;	/* reset bank */

	printf (" done\n");
	return 0;
}

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

#define FLASH_WIDTH	2	/* flash bus width in bytes */

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

	wp = (addr & ~(FLASH_WIDTH-1));	/* get lower FLASH_WIDTH 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<FLASH_WIDTH && cnt>0; ++i) {
			data = (data << 8) | *src++;
			--cnt;
			++cp;
		}
		for (; cnt==0 && i<FLASH_WIDTH; ++i, ++cp) {
			data = (data << 8) | (*(uchar *)cp);
		}

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

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

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

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

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

/*-----------------------------------------------------------------------
 * Write a word to Flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 */
static int write_data (flash_info_t *info, ulong dest, ulong data)
{
	vu_short *addr  = (vu_short*)(info->start[0]);
	vu_short *sdest = (vu_short *)dest;
	ushort sdata = (ushort)data;
	ushort sval;
	ulong start, passed;
	int flag, rc;

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

	addr[0x0555] = 0x00AA;
	addr[0x02AA] = 0x0055;
	addr[0x0555] = 0x00A0;

#ifdef WORKAROUND_FOR_BROKEN_HARDWARE
	/* work around the timeout bugs */
	udelay(20);
#endif

	*sdest = sdata;

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

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

	for (passed=0; passed < CFG_FLASH_WRITE_TOUT; passed=get_timer(start)) {

		sval = *sdest;

		if ((sval & 0x0080) == (sdata & 0x0080))
			break;

		if ((sval & 0x0020) == 0)	/* DQ5: Timeout? */
			continue;

		sval = *sdest;

		if ((sval & 0x0080) != (sdata & 0x0080))
			rc = 1;

		break;
	}

	if (rc) {
	    DEBUGF ("Program cycle failed @ addr 0x%08lX: val %04X data %04X\n",
		 dest, sval, sdata);
	}

	if (passed >= CFG_FLASH_WRITE_TOUT) {
		DEBUGF ("Timeout @ addr 0x%08lX: val %04X data %04X\n",
			dest, sval, sdata);
		rc = 1;
	}

	/* reset to read mode */
	addr = (vu_short *)info->start[0];
	addr[0] = 0x00F0;	/* reset bank */

	return (rc);
}

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