flash.c

gumstiz u-boot loader in linux

	case (FLASH_WORD_SIZE)AMD_ID_LV320T:
		info->flash_id += FLASH_AM320T;
		info->sector_count = 67;
		info->size = 0x00400000;
		break;				/* => 4 MB		*/
	case (FLASH_WORD_SIZE)AMD_ID_LV640U:
		info->flash_id += FLASH_AM640U;
		info->sector_count = 128;
		info->size = 0x00800000;
		break;				/* => 8 MB		*/
#if 0	/* enable when device IDs are available */

	case (FLASH_WORD_SIZE)AMD_ID_LV320B:
		info->flash_id += FLASH_AM320B;
		info->sector_count = 67;
		info->size = 0x00400000;
		break;				/* => 4 MB		*/
#endif
	case (FLASH_WORD_SIZE)SST_ID_xF800A:
		info->flash_id += FLASH_SST800A;
		info->sector_count = 16;
		info->size = 0x00100000;
		break;				/* => 1 MB		*/
	case (FLASH_WORD_SIZE)INTEL_ID_28F320C3T:
		info->flash_id += FLASH_INTEL320T;
		info->sector_count = 71;
		info->size = 0x00400000;
		break;				/* => 4 MB		*/


	case (FLASH_WORD_SIZE)SST_ID_xF160A:
		info->flash_id += FLASH_SST160A;
		info->sector_count = 32;
		info->size = 0x00200000;
		break;				/* => 2 MB		*/

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

	}
	/* base address calculation */
	base=0-info->size;
	/* set up sector start address table */
	if (((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) ||
	     (info->flash_id  == FLASH_AM040) ||
	     (info->flash_id  == FLASH_AM640U)){
		for (i = 0; i < info->sector_count; i++)
			info->start[i] = base + (i * 0x00010000);
	}
	else {
		if (info->flash_id & FLASH_BTYPE) {
			/* set sector offsets for bottom boot block type	*/
			info->start[0] = base + 0x00000000;
			info->start[1] = base + 0x00004000;
			info->start[2] = base + 0x00006000;
			info->start[3] = base + 0x00008000;
			for (i = 4; i < info->sector_count; i++)
				info->start[i] = base + (i * 0x00010000) - 0x00030000;
		}
		else {
			/* set sector offsets for top boot block type		*/
			i = info->sector_count - 1;
			if(info->sector_count==71) {

				info->start[i--] = base + info->size - 0x00002000;
				info->start[i--] = base + info->size - 0x00004000;
				info->start[i--] = base + info->size - 0x00006000;
				info->start[i--] = base + info->size - 0x00008000;
				info->start[i--] = base + info->size - 0x0000A000;
				info->start[i--] = base + info->size - 0x0000C000;
				info->start[i--] = base + info->size - 0x0000E000;
				for (; i >= 0; i--)
					info->start[i] = base + i * 0x000010000;
			}
			else {
				info->start[i--] = base + info->size - 0x00004000;
				info->start[i--] = base + info->size - 0x00006000;
				info->start[i--] = base + info->size - 0x00008000;
				for (; i >= 0; 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]);
		if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL)
			info->protect[i] = 0;
		else
			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)) > CFG_FLASH_ERASE_TOUT) {
			printf ("Timeout\n");
			return ERR_TIMOUT;
		}
		/* show that we're waiting */
		if ((now - last) > 1000) {  /* every second */
			putc ('.');
			last = now;
		}
	}
	return ERR_OK;
}

int intel_wait_for_DQ7(flash_info_t *info, int sect)
{
	ulong start, now, last, status;
	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)) > CFG_FLASH_ERASE_TOUT) {
			printf ("Timeout\n");
			return ERR_TIMOUT;
		}
		/* show that we're waiting */
		if ((now - last) > 1000) {  /* every second */
			putc ('.');
			last = now;
		}
	}
	status = addr[0] & (FLASH_WORD_SIZE)0x00280028;
	/* clear status register */
	addr[0] = (FLASH_WORD_SIZE)0x00500050;
	/* check status for block erase fail and VPP low */
	return (status == 0 ? ERR_OK : ERR_NOT_ERASED);
}

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

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;
	int i, 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) {
		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); */ /* CLH */
			if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) {
				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)0x00500050;  /* block erase */
				for (i=0; i<50; i++)
					udelay(1000);  /* wait 1 ms */
				rcode |= wait_for_DQ7(info, sect);
			}
			else {
				if((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL){
					addr2[0] = (FLASH_WORD_SIZE)0x00600060;  /* unlock sector */
					addr2[0] = (FLASH_WORD_SIZE)0x00D000D0;  /* sector erase */
					intel_wait_for_DQ7(info, sect);
					addr2[0] = (FLASH_WORD_SIZE)0x00200020;  /* sector erase */
					addr2[0] = (FLASH_WORD_SIZE)0x00D000D0;  /* sector erase */
					rcode |= intel_wait_for_DQ7(info, sect);
				}
				else {
					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 */
					rcode |= wait_for_DQ7(info, sect);
				}
			}
			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);

#if 0
	/*
	 * We wait for the last triggered sector
	 */
	if (l_sect < 0)
		goto DONE;
	wait_for_DQ7(info, l_sect);

DONE:
#endif
	/* reset to read mode */
	addr = (FLASH_WORD_SIZE *)info->start[0];
	addr[0] = (FLASH_WORD_SIZE)0x00F000F0;	/* reset bank */

	if (!rcode)
	    printf (" done\n");

	return rcode;
}


void unlock_intel_sectors(flash_info_t *info,ulong addr,ulong cnt)
{
	int i;
	volatile FLASH_WORD_SIZE *addr2;
	long c;
	c= (long)cnt;
	for(i=info->sector_count-1;i>0;i--)
	{
		if(addr>=info->start[i])
			break;
	}
	do {
		addr2 = (FLASH_WORD_SIZE *)(info->start[i]);
		addr2[0] = (FLASH_WORD_SIZE)0x00600060;  /* unlock sector setup */
		addr2[0] = (FLASH_WORD_SIZE)0x00D000D0;  /* unlock sector */
		intel_wait_for_DQ7(info, i);
		i++;
		c-=(info->start[i]-info->start[i-1]);
	}while(c>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;

	if((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL){
		unlock_intel_sectors(info,addr,cnt);
	}
	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;
		if((wp % 0x10000)==0)
			printf("."); /* show Progress */
		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);
	}
	rc=write_word(info, wp, data);
	return rc;
}

/*-----------------------------------------------------------------------
 * Write a word to Flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 */
static FLASH_WORD_SIZE *read_val = (FLASH_WORD_SIZE *)0x200000;

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++)
	{
		if((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL){
			/* intel style writting */
			dest2[i] = (FLASH_WORD_SIZE)0x00500050;
			dest2[i] = (FLASH_WORD_SIZE)0x00400040;
			*read_val++ = data2[i];
			dest2[i] = data2[i];
			if (flag)
				enable_interrupts();
			/* data polling for D7 */
			start = get_timer (0);
			udelay(10);
			while ((dest2[i] & (FLASH_WORD_SIZE)0x00800080) != (FLASH_WORD_SIZE)0x00800080)
			{
				if (get_timer(start) > CFG_FLASH_WRITE_TOUT)
					return (1);
			}
			dest2[i] = (FLASH_WORD_SIZE)0x00FF00FF; /* return to read mode */
			udelay(10);
			dest2[i] = (FLASH_WORD_SIZE)0x00FF00FF; /* return to read mode */
			if(dest2[i]!=data2[i])
				printf("Error at %p 0x%04X != 0x%04X\n",&dest2[i],dest2[i],data2[i]);
		}
		else {
			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) > CFG_FLASH_WRITE_TOUT) {
					return (1);
				}
			}
		}
	}
	return (0);
}

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