flash.c

适合KS8695X

	switch (value) {
		case (AMD_MANUFACT & FLASH_ID_MASK):
			info->flash_id = FLASH_MAN_AMD;
			break;
		case (FUJ_MANUFACT & FLASH_ID_MASK):
			info->flash_id = FLASH_MAN_FUJ;
			break;
		case (STM_MANUFACT & FLASH_ID_MASK):
			info->flash_id = FLASH_MAN_STM;
			break;
		case (SST_MANUFACT & FLASH_ID_MASK):
			info->flash_id = FLASH_MAN_SST;
			break;
		case (INTEL_MANUFACT & FLASH_ID_MASK):
			info->flash_id = FLASH_MAN_INTEL;
			break;
		default:
			info->flash_id = FLASH_UNKNOWN;
			info->sector_count = 0;
			info->size = 0;
			return (0); /* no or unknown flash */
	}

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

	switch (value) {
		case (AMD_ID_LV160T & FLASH_ID_MASK):
			info->flash_id += FLASH_AM160T;
			info->sector_count = 35;
			info->size = 0x00400000;
			break; /* => 4 MB */

		case (AMD_ID_LV160B & FLASH_ID_MASK):
			info->flash_id += FLASH_AM160B;
			info->sector_count = 35;
			info->size = 0x00400000;
			break; /* => 4 MB */

		case (AMD_ID_DL163T & FLASH_ID_MASK):
			info->flash_id += FLASH_AMDL163T;
			info->sector_count = 39;
			info->size = 0x00400000;
			break; /* => 4 MB */

		case (AMD_ID_DL163B & FLASH_ID_MASK):
			info->flash_id += FLASH_AMDL163B;
			info->sector_count = 39;
			info->size = 0x00400000;
			break; /* => 4 MB */

		case (AMD_ID_DL323T & FLASH_ID_MASK):
			info->flash_id += FLASH_AMDL323T;
			info->sector_count = 71;
			info->size = 0x00800000;
			break; /* => 8 MB */

		case (AMD_ID_DL323B & FLASH_ID_MASK):
			info->flash_id += FLASH_AMDL323B;
			info->sector_count = 71;
			info->size = 0x00800000;
			break; /* => 8 MB */

		case (AMD_ID_DL322T & FLASH_ID_MASK):
			info->flash_id += FLASH_AMDL322T;
			info->sector_count = 71;
			info->size = 0x00800000;
			break; /* => 8 MB */

		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];
		*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;
	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) ) {
		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] = 0x00AA00AA;
	addr[0x02AA] = 0x00550055;
	addr[0x0555] = 0x00800080;
	addr[0x0555] = 0x00AA00AA;
	addr[0x02AA] = 0x00550055;
	/* 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) > 1000) { /* 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 */

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

/*-----------------------------------------------------------------------
 * 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 l;
	int i, 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)
{
	vu_long *addr = (vu_long*)(info->start[0]);
	ulong start;
	int flag;

	/* 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();

	/* AMD stuff */
	addr[0x0555] = 0x00AA00AA;
	addr[0x02AA] = 0x00550055;
	addr[0x0555] = 0x00A000A0;

	*((vu_long *)dest) = data;

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

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

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

	return (0);
}