flash.c

u-boot-1.1.6 源码包

				type = "AM29LV320T (32 Mbit, top boot sector)";
				break;
			case FLASH_STM800AB:
				type = "M29W800AB (8 Mbit, bottom boot sect)";
				break;
			case FLASH_SST800A:
				type = "SST39LF/VF800 (8 Mbit, uniform sector size)";
				break;
			case FLASH_SST160A:
				type = "SST39LF/VF160 (16 Mbit, uniform sector size)";
				break;
		}
	}

	printf(
			"\n  Brand: %s Type: %s\n"
			"  Size: %lu KB in %d Sectors\n",
			mfct,
			type,
			info->size >> 10,
			info->sector_count
	      );

	printf ("  Sector Start Addresses:");

	for (i = 0; i < info->sector_count; i++){
		unsigned long size;
		unsigned int erased;
		unsigned long * flash = (unsigned long *) info->start[i];

		/*
		 * Check if whole sector is erased
		 */
		size =
			(i != (info->sector_count - 1)) ?
			(info->start[i + 1] - info->start[i]) >> 2 :
			(info->start[0] + info->size - info->start[i]) >> 2;

		for(
				flash = (unsigned long *) info->start[i], erased = 1;
				(flash != (unsigned long *) info->start[i] + size) && erased;
				flash++
		   ){
			erased = *flash == ~0x0UL;
		}

		printf(
				"%s %08lX %s %s",
				(i % 5) ? "" : "\n   ",
				info->start[i],
				erased ? "E" : " ",
				info->protect[i] ? "RO" : "  "
		      );
	}

	puts("\n");
	return;
}

int flash_erase(flash_info_t *info, int s_first, int s_last)
{
	volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *)(info->start[0]);
	int flag, prot, sect, l_sect;
	ulong start, now, last;
	unsigned char sh8b;

	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_MAN_STM | 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;

	/* Check the ROM CS */
	if ((info->start[0] >= ROM_CS1_START) && (info->start[0] < ROM_CS0_START)){
		sh8b = 3;
	}
	else{
		sh8b = 0;
	}

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

	addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
	addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
	addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00800080;
	addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
	addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;

	/* Start erase on unprotected sectors */
	for (sect = s_first; sect<=s_last; sect++) {
		if (info->protect[sect] == 0) { /* not protected */
			addr = (FLASH_WORD_SIZE *)(info->start[0] + (
						(info->start[sect] - info->start[0]) << sh8b));
			if (info->flash_id & FLASH_MAN_SST){
				addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
				addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
				addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00800080;
				addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
				addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
				addr[0] = (FLASH_WORD_SIZE)0x00500050;  /* block erase */
				udelay(30000);  /* wait 30 ms */
			}
			else
				addr[0] = (FLASH_WORD_SIZE)0x00300030;  /* sector erase */
			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 = (FLASH_WORD_SIZE *)(info->start[0] + (
				(info->start[l_sect] - info->start[0]) << sh8b));
	while ((addr[0] & (FLASH_WORD_SIZE)0x00800080) != (FLASH_WORD_SIZE)0x00800080) {
		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 = (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;
	volatile FLASH_WORD_SIZE *data2 = (FLASH_WORD_SIZE *)&data;
	ulong start;
	int flag;
	int i;
	unsigned char sh8b;

	/* Check the ROM CS */
	if ((info->start[0] >= ROM_CS1_START) && (info->start[0] < ROM_CS0_START)){
		sh8b = 3;
	}
	else{
		sh8b = 0;
	}

	dest2 = (FLASH_WORD_SIZE *)(((dest - info->start[0]) << sh8b) +
			info->start[0]);

	/* Check if Flash is (sufficiently) erased */
	if ((*dest2 & (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 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
		addr2[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
		addr2[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00A000A0;

		dest2[i << sh8b] = data2[i];

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

		/* data polling for D7 */
		start = get_timer (0);
		while ((dest2[i << sh8b] & (FLASH_WORD_SIZE)0x00800080) !=
				(data2[i] & (FLASH_WORD_SIZE)0x00800080)) {
			if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
				return (1);
			}
		}
	}

	return (0);
}

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