flash.c

适合KS8695X

	case (unsigned char)AMD_ID_LV065D:
		info->flash_id += FLASH_AMDLV065D;
		info->sector_count = 128;
		info->size = 0x00800000;
		break;				/* => 8 MB		*/

	case (unsigned char)AMD_ID_LV320T:
		info->flash_id += FLASH_AM320T;
		info->sector_count = 67;
		info->size = 0x00400000;
		break;				/* => 4 MB		*/

	case (unsigned char)AMD_ID_LV320B:
		info->flash_id += FLASH_AM320B;
		info->sector_count = 67;
		info->size = 0x00400000;
		break;				/* => 4 MB		*/

	case (unsigned char)SST_ID_xF800A:
		info->flash_id += FLASH_SST800A;
		info->sector_count = 16;
		info->size = 0x00100000;
		break;				/* => 1 MB		*/

	case (unsigned char)SST_ID_xF160A:
		info->flash_id += FLASH_SST160A;
		info->sector_count = 32;
		info->size = 0x00200000;
		break;				/* => 2 MB		*/
	case (unsigned char)SST_ID_xF040:
		info->flash_id += FLASH_SST040;
		info->sector_count = 128;
		info->size = 0x00080000;
		break;				/* => 512KB		*/

	default:
                debug ("Undefined Device ID\n");
		info->flash_id = FLASH_UNKNOWN;
		break;
	}

	if (info->sector_count > CFG_MAX_FLASH_SECT) {
		printf ("** ERROR: sector count %d > max (%d) **\n",
			info->sector_count, CFG_MAX_FLASH_SECT);
		info->sector_count = CFG_MAX_FLASH_SECT;
	}
#ifdef UBOOT_ORIG
	addr[0] = 0xFF;	/* restore read mode */
#endif

	flash_reset(addr);

	return (info->size);
}


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

int flash_erase (flash_info_t * info, int s_first, int s_last)
{
	volatile u32 addr = info->start[0];
	int flag, prot, sect, l_sect;
	ulong type;
	int rcode = 0;
	ulong start, now, last;

	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 (info->flash_id == FLASH_UNKNOWN) {
		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");

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

	/* Start erase  n unprotected sectors */
	out8(addr + 0x555, 0xAA);
        iobarrier_rw();
        out8(addr + 0x2AA, 0x55);
        iobarrier_rw();
        out8(addr + 0x555, 0x80);
        iobarrier_rw();
        out8(addr + 0x555, 0xAA);
        iobarrier_rw();
        out8(addr + 0x2AA, 0x55);
        iobarrier_rw();
#ifdef DEL
	for (sect = s_first; sect <= s_last; sect++) {
		if (info->protect[sect] == 0) {	/* not protected */
			volatile unsigned char *addr;
			unsigned char status;

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

			/* arm simple, non interrupt dependent timer */
			reset_timer_masked ();

			addr = (volatile unsigned char *) (info->start[sect]);
			*addr = 0x50;	/* clear status register */
			*addr = 0x20;	/* erase setup */
			*addr = 0xD0;	/* erase confirm */

			while (((status = *addr) & 0x80) != 0x80) {
				if (get_timer_masked () >
				    CFG_FLASH_ERASE_TOUT) {
					printf ("Timeout\n");
					*addr = 0xB0;	/* suspend erase */
					*addr = 0xFF;	/* reset to read mode */
					rcode = 1;
					break;
				}
			}

			*addr = 0x50;	/* clear status register cmd */
			*addr = 0xFF;	/* resest to read mode */

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

	/* Start erase on unprotected sectors */
	for (sect = s_first; sect<=s_last; sect++) {
		if (info->protect[sect] == 0) {	/* not protected */
			addr = info->start[sect];
			out8(addr, 0x30);
			iobarrier_rw();
			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 = info->start[l_sect];

//	debug("Start erase timeout: %d\n", CFG_FLASH_ERASE_TOUT);

	while ((in8(addr) & 0x80) != 0x80) {
		if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
			printf ("Timeout\n");
			flash_reset (info->start[0]);
			return 1;
		}
		/* show that we're waiting */
		if ((now - last) > 1000) {	/* every second */
			putc ('.');
			last = now;
		}
		iobarrier_rw();
	}

DONE:
	/* reset to read mode */
	flash_reset (info->start[0]);

	printf (" done\n");
	return 0;
}

/*-----------------------------------------------------------------------
 * 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;
	unsigned char data;
	int count, i, l, rc, port_width;

	if (info->flash_id == FLASH_UNKNOWN)
		return 4;

	wp = addr;
	port_width = 1;

	/*
	 * 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, 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, 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, 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, unsigned char data)
{
	volatile unsigned char *addr = (volatile unsigned char *) dest;
	ulong status, start;
	int flag, i=0;

	/* Check if Flash is (sufficiently) erased */
	if ((*addr & data) != data) {
		printf ("not erased at %08lx (%lx)\n", (ulong) addr,
			(ulong) * addr);
		return (2);
	}

	/* write each byte out */
//	for (i = 0; i < 4; i++) 
	{
		char *data_ch = (char *)&data;
		int flag = disable_interrupts();

		out8(addr + 0x555, 0xAA);
		iobarrier_rw();
		out8(addr + 0x2AA, 0x55);
		iobarrier_rw();
		out8(addr + 0x555, 0xA0);
		iobarrier_rw();
		out8(dest+i, data_ch[i]);
		iobarrier_rw();

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

		/* data polling for D7 */
		start = get_timer (0);
		while ((in8(dest+i) & 0x80) != (data_ch[i] & 0x80)) {
			if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
				flash_reset (addr);
				return (1);
			}
			iobarrier_rw();
		}
	}

	flash_reset (addr);
	return (0);
}

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

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