flash.c

u-boot-1.1.6 源码包

	/* wait at least 35ns (W12) before issuing Read Status Register */
	udelay(1);
	addr = (FPWV *) info->start[sector];
	*addr = (FPW) INTEL_STATUS;

	start = get_timer (0);
	while ((*addr & (FPW) INTEL_FINISHED) != (FPW) INTEL_FINISHED) {
		if (get_timer (start) > CFG_FLASH_ERASE_TOUT) {
			*addr = (FPW) INTEL_RESET; /* restore read mode */
			printf("WSM busy too long, can't get prot status\n");
			return 1;
		}
	}

	/* issue the Read Identifier Codes command */
	*addr = (FPW) INTEL_READID;

	/* wait at least 35ns (W12) before reading */
	udelay(1);

	/* Intel example code uses offset of 2 for 16 bit flash */
	lock_conf_addr = (FPWV *) info->start[sector] + 2;
	ret = (*lock_conf_addr & (FPW) INTEL_PROTECT) ? 1 : 0;

	/* put flash back in read mode */
	*addr = (FPW) INTEL_RESET;

	return ret;
}

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

int flash_erase (flash_info_t *info, int s_first, int s_last)
{
	int flag, prot, sect;
	ulong type, start, 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;
	}

	type = (info->flash_id & FLASH_VENDMASK);
	if ((type != FLASH_MAN_INTEL)) {
		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");
	}

	start = get_timer (0);
	last = start;

	/* 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 */
			FPWV *addr = (FPWV *) (info->start[sect]);
			FPW status;

			printf ("Erasing sector %2d ... ", sect);

			/* arm simple, non interrupt dependent timer */
			start = get_timer(0);

			*addr = (FPW) 0x00500050;	/* clear status register */
			*addr = (FPW) 0x00200020;	/* erase setup */
			*addr = (FPW) 0x00D000D0;	/* erase confirm */

			while (((status = *addr) & (FPW) 0x00800080) != (FPW) 0x00800080) {
				if (get_timer(start) > CFG_FLASH_ERASE_TOUT) {
					printf ("Timeout\n");
					*addr = (FPW) 0x00B000B0;	/* suspend erase     */
					*addr = (FPW) 0x00FF00FF;	/* reset to read mode */
					rcode = 1;
					break;
				}
			}

			*addr = 0x00500050;	/* clear status register cmd.   */
			*addr = 0x00FF00FF;	/* resest to read mode          */

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

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

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

	if (info->flash_id == FLASH_UNKNOWN) {
		return 4;
	}
/* get lower word aligned address */
#ifdef FLASH_PORT_WIDTH16
	wp = (addr & ~1);
	port_width = 2;
#else
	wp = (addr & ~3);
	port_width = 4;
#endif

	/*
	 * 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 < port_width && cnt > 0; ++i) {
			data = (data << 8) | *src++;
			--cnt;
			++cp;
		}
		for (; cnt == 0 && i < port_width; ++i, ++cp) {
			data = (data << 8) | (*(uchar *) cp);
		}

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

	/*
	 * handle word aligned part
	 */
	count = 0;
	while (cnt >= port_width) {
		data = 0;
		for (i = 0; i < port_width; ++i) {
			data = (data << 8) | *src++;
		}
		if ((rc = write_data (info, wp, SWAP (data))) != 0) {
			return (rc);
		}
		wp += port_width;
		cnt -= port_width;
		if (count++ > 0x800) {
			spin_wheel ();
			count = 0;
		}
	}

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

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

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

/*-----------------------------------------------------------------------
 * Write a word or halfword to Flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 */
static int write_data (flash_info_t *info, ulong dest, FPW data)
{
	FPWV *addr = (FPWV *) dest;
	ulong status;
	ulong start;
	int flag;

	/* Check if Flash is (sufficiently) erased */
	if ((*addr & data) != data) {
		printf ("not erased at %08lx (%lx)\n", (ulong) addr, *addr);
		return (2);
	}
	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts ();

	*addr = (FPW) 0x00400040;	/* write setup */
	*addr = data;

	/* arm simple, non interrupt dependent timer */
	start = get_timer(0);

	/* wait while polling the status register */
	while (((status = *addr) & (FPW) 0x00800080) != (FPW) 0x00800080) {
		if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
			*addr = (FPW) 0x00FF00FF;	/* restore read mode */
			return (1);
		}
	}

	*addr = (FPW) 0x00FF00FF;	/* restore read mode */

	return (0);
}

void inline spin_wheel (void)
{
	static int p = 0;
	static char w[] = "\\/-";

	printf ("\010%c", w[p]);
	(++p == 3) ? (p = 0) : 0;
}

/*-----------------------------------------------------------------------
 * Set/Clear sector's lock bit, returns:
 * 0 - OK
 * 1 - Error (timeout, voltage problems, etc.)
 */
int flash_real_protect (flash_info_t *info, long sector, int prot)
{
	ulong start;
	int i;
	int rc = 0;
	vu_long *addr = (vu_long *)(info->start[sector]);
	int flag = disable_interrupts();

	*addr = INTEL_CLEAR;	/* Clear status register */
	if (prot) {			/* Set sector lock bit */
		*addr = INTEL_LOCKBIT;	/* Sector lock bit */
		*addr = INTEL_PROTECT;	/* set */
	}
	else {				/* Clear sector lock bit */
		*addr = INTEL_LOCKBIT;	/* All sectors lock bits */
		*addr = INTEL_CONFIRM;	/* clear */
	}

	start = get_timer(0);

	while ((*addr & INTEL_FINISHED) != INTEL_FINISHED) {
		if (get_timer(start) > CFG_FLASH_UNLOCK_TOUT) {
			printf("Flash lock bit operation timed out\n");
			rc = 1;
			break;
		}
	}

	if (*addr != INTEL_OK) {
		printf("Flash lock bit operation failed at %08X, CSR=%08X\n",
		       (uint)addr, (uint)*addr);
		rc = 1;
	}

	if (!rc)
		info->protect[sector] = prot;

	/*
	 * Clear lock bit command clears all sectors lock bits, so
	 * we have to restore lock bits of protected sectors.
	 * WARNING: code below re-locks sectors only for one bank (info).
	 * This causes problems on boards where several banks share
	 * the same chip, as sectors in othere banks will be unlocked
	 * but not re-locked. It works fine on pm520 though, as there
	 * is only one chip and one bank.
	 */
	if (!prot)
	{
		for (i = 0; i < info->sector_count; i++)
		{
			if (info->protect[i])
			{
				start = get_timer(0);
				addr = (vu_long *)(info->start[i]);
				*addr = INTEL_LOCKBIT;	/* Sector lock bit */
				*addr = INTEL_PROTECT;	/* set */
				while ((*addr & INTEL_FINISHED) != INTEL_FINISHED)
				{
					if (get_timer(start) > CFG_FLASH_UNLOCK_TOUT)
					{
						printf("Flash lock bit operation timed out\n");
						rc = 1;
						break;
					}
				}
			}
		}
		/*
		 * get the s/w sector protection status in sync with the h/w,
		 * in case something went wrong during the re-locking.
		 */
		flash_sync_real_protect(info); /* resets flash to read  mode */
	}

	if (flag)
		enable_interrupts();

	*addr = INTEL_RESET;		/* Reset to read array mode */

	return rc;
}