flash.c

uboot200903最新版本的通用uboot

		}
	}

	/* 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 CONFIG_SYS_FLASH_WORD_SIZE *)(info->start[i]);

		/* For AMD29033C flash we need to resend the command of *
		 * reading flash protection for upper 8 Mb of flash     */
		if (i == 32) {
			addr2[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0xAAAAAAAA;
			addr2[CONFIG_SYS_FLASH_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x55555555;
			addr2[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x90909090;
		}

		if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST)
			info->protect[i] = 0;
		else
			info->protect[i] = addr2[2] & 1;
	}

	/* issue bank reset to return to read mode */
	addr2[0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00F000F0;

	return (info->size);
}

static int wait_for_DQ7_1(flash_info_t * info, int sect)
{
	ulong start, now, last;
	volatile CONFIG_SYS_FLASH_WORD_SIZE *addr =
		(CONFIG_SYS_FLASH_WORD_SIZE *) (info->start[sect]);

	start = get_timer(0);
	last = start;
	while ((addr[0] & (CONFIG_SYS_FLASH_WORD_SIZE) 0x00800080) !=
			(CONFIG_SYS_FLASH_WORD_SIZE) 0x00800080) {
		if ((now = get_timer(start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
			printf("Timeout\n");
			return -1;
		}
		/* show that we're waiting */
		if ((now - last) > 1000) {	/* every second */
			putc('.');
			last = now;
		}
	}
	return 0;
}

#ifdef CONFIG_SYS_FLASH_2ND_16BIT_DEV
int flash_erase(flash_info_t * info, int s_first, int s_last)
{
	if (((info->flash_id & FLASH_TYPEMASK) == FLASH_AM320B) ||
			((info->flash_id & FLASH_TYPEMASK) == FLASH_AM320T) ||
			((info->flash_id & FLASH_TYPEMASK) == FLASH_STMW320DT) ||
			((info->flash_id & FLASH_TYPEMASK) == FLASH_MXLV320T)) {
		return flash_erase_2(info, s_first, s_last);
	} else {
		return flash_erase_1(info, s_first, s_last);
	}
}

static int flash_erase_1(flash_info_t * info, int s_first, int s_last)
#else
int flash_erase(flash_info_t * info, int s_first, int s_last)
#endif
{
	volatile CONFIG_SYS_FLASH_WORD_SIZE *addr = (CONFIG_SYS_FLASH_WORD_SIZE *) (info->start[0]);
	volatile CONFIG_SYS_FLASH_WORD_SIZE *addr2;
	int flag, prot, sect, l_sect;
	int i;

	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!", prot);

	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 = (CONFIG_SYS_FLASH_WORD_SIZE *) (info->start[sect]);

			if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) {
				addr[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00AA00AA;
				addr[CONFIG_SYS_FLASH_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00550055;
				addr[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00800080;
				addr[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00AA00AA;
				addr[CONFIG_SYS_FLASH_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00550055;
				addr2[0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00500050;	/* block erase */
				for (i = 0; i < 50; i++)
					udelay(1000);	/* wait 1 ms */
			} else {
				addr[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00AA00AA;
				addr[CONFIG_SYS_FLASH_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00550055;
				addr[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00800080;
				addr[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00AA00AA;
				addr[CONFIG_SYS_FLASH_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00550055;
				addr2[0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00300030;	/* sector erase */
			}
			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_1(info, sect);
		}
	}

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

	/* wait at least 80us - let's wait 1 ms */
	udelay(1000);

	/* reset to read mode */
	addr = (CONFIG_SYS_FLASH_WORD_SIZE *) info->start[0];
	addr[0] = (CONFIG_SYS_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));
}

/*-----------------------------------------------------------------------
 * Copy memory to flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 */
#ifdef CONFIG_SYS_FLASH_2ND_16BIT_DEV
static int write_word(flash_info_t * info, ulong dest, ulong data)
{
	if (((info->flash_id & FLASH_TYPEMASK) == FLASH_AM320B) ||
			((info->flash_id & FLASH_TYPEMASK) == FLASH_AM320T) ||
			((info->flash_id & FLASH_TYPEMASK) == FLASH_STMW320DT) ||
			((info->flash_id & FLASH_TYPEMASK) == FLASH_MXLV320T)) {
		return write_word_2(info, dest, data);
	} else {
		return write_word_1(info, dest, data);
	}
}

static int write_word_1(flash_info_t * info, ulong dest, ulong data)
#else
static int write_word(flash_info_t * info, ulong dest, ulong data)
#endif
{
	volatile CONFIG_SYS_FLASH_WORD_SIZE *addr2 = (CONFIG_SYS_FLASH_WORD_SIZE *) (info->start[0]);
	volatile CONFIG_SYS_FLASH_WORD_SIZE *dest2 = (CONFIG_SYS_FLASH_WORD_SIZE *) dest;
	volatile CONFIG_SYS_FLASH_WORD_SIZE *data2 = (CONFIG_SYS_FLASH_WORD_SIZE *) & data;
	ulong start;
	int i, flag;

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

	for (i = 0; i < 4 / sizeof(CONFIG_SYS_FLASH_WORD_SIZE); i++) {
		/* Disable interrupts which might cause a timeout here */
		flag = disable_interrupts();

		addr2[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00AA00AA;
		addr2[CONFIG_SYS_FLASH_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00550055;
		addr2[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_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] & (CONFIG_SYS_FLASH_WORD_SIZE) 0x00800080) !=
				(data2[i] & (CONFIG_SYS_FLASH_WORD_SIZE) 0x00800080)) {

			if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT)
				return (1);
		}
	}

	return (0);
}

#ifdef CONFIG_SYS_FLASH_2ND_16BIT_DEV

#undef  CONFIG_SYS_FLASH_WORD_SIZE
#define CONFIG_SYS_FLASH_WORD_SIZE unsigned short

/*
 * The following code cannot be run from FLASH!
 */
static ulong flash_get_size_2(vu_long * addr, flash_info_t * info)
{
	short i;
	int n;
	CONFIG_SYS_FLASH_WORD_SIZE value;
	ulong base = (ulong) addr;
	volatile CONFIG_SYS_FLASH_WORD_SIZE *addr2 = (CONFIG_SYS_FLASH_WORD_SIZE *) addr;

	DEBUGF("FLASH ADDR: %08x\n", (unsigned)addr);

	/* issue bank reset to return to read mode */
	addr2[0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00F000F0;
	/* Write auto select command: read Manufacturer ID */
	addr2[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00AA00AA;
	addr2[CONFIG_SYS_FLASH_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00550055;
	addr2[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00900090;
	udelay(1000);

	value = addr2[0];
	DEBUGF("FLASH MANUFACT: %x\n", value);

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

	value = addr2[1];	/* device ID            */
	DEBUGF("\nFLASH DEVICEID: %x\n", value);

	switch (value) {
		case (CONFIG_SYS_FLASH_WORD_SIZE)AMD_ID_LV320T:
			info->flash_id += FLASH_AM320T;
			info->sector_count = 71;
			info->size = 0x00400000;
			break;	/* => 4 MB	*/
		case (CONFIG_SYS_FLASH_WORD_SIZE)AMD_ID_LV320B:
			info->flash_id += FLASH_AM320B;
			info->sector_count = 71;
			info->size = 0x00400000;
			break;	/* => 4 MB	*/
		case (CONFIG_SYS_FLASH_WORD_SIZE)STM_ID_29W320DT:
			info->flash_id += FLASH_STMW320DT;
			info->sector_count = 67;
			info->size = 0x00400000;