info->flash_id = FLASH_UNKNOWN;		return (0);			/* => no or unknown flash */	}	/* set up sector start address table */	flash_get_offsets (base, info);	/* 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 */#ifdef CONFIG_MVS_16BIT_FLASH		addr = (vu_short *)(info->start[i]);#else		addr = (vu_long *)(info->start[i]);#endif		info->protect[i] = addr[2] & 1;	}	/*	 * Prevent writes to uninitialized FLASH.	 */	if (info->flash_id != FLASH_UNKNOWN) {#ifdef CONFIG_MVS_16BIT_FLASH		addr = (vu_short *)info->start[0];#else		addr = (vu_long *)info->start[0];#endif		*addr = RESET_BANK_DATA;	/* reset bank */	}	return (info->size);}/*----------------------------------------------------------------------- */#define ERASE_ADDR1 0x0555#define ERASE_ADDR2 0x02AA#define ERASE_ADDR3 ERASE_ADDR1#define ERASE_ADDR4 ERASE_ADDR1#define ERASE_ADDR5 ERASE_ADDR2#define ERASE_DATA1 (0x00AA00AA & FLASH_DATA_MASK)#define ERASE_DATA2 (0x00550055 & FLASH_DATA_MASK)#define ERASE_DATA3 (0x00800080 & FLASH_DATA_MASK)#define ERASE_DATA4 ERASE_DATA1#define ERASE_DATA5 ERASE_DATA2#define ERASE_SECTOR_DATA (0x00300030 & FLASH_DATA_MASK)#define ERASE_CHIP_DATA (0x00100010 & FLASH_DATA_MASK)#define ERASE_CONFIRM_DATA (0x00800080 & FLASH_DATA_MASK)int	flash_erase (flash_info_t *info, int s_first, int s_last){#ifdef CONFIG_MVS_16BIT_FLASH	vu_short *addr = (vu_short *)(info->start[0]);#else	vu_long *addr = (vu_long *)(info->start[0]);#endif	int flag, prot, sect, l_sect;	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;	}	if ((info->flash_id == FLASH_UNKNOWN) ||	    (info->flash_id > FLASH_AMD_COMP)) {		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");	}	l_sect = -1;	/* Disable interrupts which might cause a timeout here */	flag = disable_interrupts();	addr[ERASE_ADDR1] = ERASE_DATA1;	addr[ERASE_ADDR2] = ERASE_DATA2;	addr[ERASE_ADDR3] = ERASE_DATA3;	addr[ERASE_ADDR4] = ERASE_DATA4;	addr[ERASE_ADDR5] = ERASE_DATA5;	/* Start erase on unprotected sectors */	for (sect = s_first; sect<=s_last; sect++) {		if (info->protect[sect] == 0) {	/* not protected */#ifdef CONFIG_MVS_16BIT_FLASH			addr = (vu_short *)(info->start[sect]);#else			addr = (vu_long *)(info->start[sect]);#endif			addr[0] = ERASE_SECTOR_DATA;			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;#ifdef CONFIG_MVS_16BIT_FLASH	addr = (vu_short *)(info->start[l_sect]);#else	addr = (vu_long *)(info->start[l_sect]);#endif	while ((addr[0] & ERASE_CONFIRM_DATA) != ERASE_CONFIRM_DATA) {		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 */			putc ('.');			last = now;		}	}DONE:	/* reset to read mode */#ifdef CONFIG_MVS_16BIT_FLASH	addr = (vu_short *)info->start[0];#else	addr = (vu_long *)info->start[0];#endif	addr[0] = RESET_BANK_DATA;	/* 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){#define BUFF_INC 4	ulong cp, wp, data;	int i, l, rc;	mvdebug (("+write_buff %p ==> 0x%08lx, count = 0x%08lx\n", src, addr, cnt));	wp = (addr & ~3);	/* get lower word aligned address */	/*	 * handle unaligned start bytes	 */	if ((l = addr - wp) != 0) {		mvdebug ((" handle unaligned start bytes (cnt = 0x%08%lx)\n", cnt));		data = 0;		for (i=0, cp=wp; i<l; ++i, ++cp) {			data = (data << 8) | (*(uchar *)cp);		}		for (; i<BUFF_INC && cnt>0; ++i) {			data = (data << 8) | *src++;			--cnt;			++cp;		}		for (; cnt==0 && i<BUFF_INC; ++i, ++cp) {			data = (data << 8) | (*(uchar *)cp);		}		if ((rc = write_word(info, wp, data)) != 0) {			return (rc);		}		wp += BUFF_INC;	}	/*	 * handle (half)word aligned part	 */	mvdebug ((" handle word aligned part (cnt = 0x%08%lx)\n", cnt));	while (cnt >= BUFF_INC) {		data = 0;		for (i=0; i<BUFF_INC; ++i) {			data = (data << 8) | *src++;		}		if ((rc = write_word(info, wp, data)) != 0) {			return (rc);		}		wp  += BUFF_INC;		cnt -= BUFF_INC;	}	if (cnt == 0) {		return (0);	}	/*	 * handle unaligned tail bytes	 */	mvdebug ((" handle unaligned tail bytes (cnt = 0x%08%lx)\n", cnt));	data = 0;	for (i=0, cp=wp; i<BUFF_INC && cnt>0; ++i, ++cp) {		data = (data << 8) | *src++;		--cnt;	}	for (; i<BUFF_INC; ++i, ++cp) {		data = (data << 8) | (*(uchar *)cp);	}	return (write_word(info, wp, data));}#define WRITE_ADDR1 0x0555#define WRITE_ADDR2 0x02AA#define WRITE_ADDR3 WRITE_ADDR1#define WRITE_DATA1 (0x00AA00AA & FLASH_DATA_MASK)#define WRITE_DATA2 (0x00550055 & FLASH_DATA_MASK)#define WRITE_DATA3 (0x00A000A0 & FLASH_DATA_MASK)#define WRITE_CONFIRM_DATA ERASE_CONFIRM_DATA#ifndef CONFIG_MVS_16BIT_FLASH/*----------------------------------------------------------------------- * 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){	vu_long *addr = (vu_long *)(info->start[0]);	ulong start;	int flag;	mvdebug (("+write_word (to 0x%08lx)\n", dest));	/* Check if Flash is (sufficiently) erased */	if ((*((vu_long *)dest) & data) != data) {		return (2);	}	/* Disable interrupts which might cause a timeout here */	flag = disable_interrupts();	addr[WRITE_ADDR1] = WRITE_DATA1;	addr[WRITE_ADDR2] = WRITE_DATA2;	addr[WRITE_ADDR3] = WRITE_DATA3;	*((vu_long *)dest) = data;	/* re-enable interrupts if necessary */	if (flag)		enable_interrupts();	/* data polling for D7 */	start = get_timer (0);	addr = (vu_long *)dest;	while ((*addr & WRITE_CONFIRM_DATA) != (data & WRITE_CONFIRM_DATA)) {		if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {			return (1);		}	} 	mvdebug (("-write_word\n"));	return (0);}#else /* CONFIG_MVS_16BIT_FLASH *//*----------------------------------------------------------------------- * Write a halfword to Flash, returns: * 0 - OK * 1 - write timeout * 2 - Flash not erased */static int write_halfword (flash_info_t *info, ulong dest, ushort data){	vu_short *addr = (vu_short *)(info->start[0]);	ulong start;	int flag;	mvdebug (("+write_halfword (to 0x%08lx)\n", dest));	/* Check if Flash is (sufficiently) erased */	if ((*((vu_short *)dest) & data) != data) {		return (2);	}	/* Disable interrupts which might cause a timeout here */	flag = disable_interrupts();	addr[WRITE_ADDR1] = WRITE_DATA1;	addr[WRITE_ADDR2] = WRITE_DATA2;	addr[WRITE_ADDR3] = WRITE_DATA3;	*((vu_short *)dest) = data;	/* re-enable interrupts if necessary */	if (flag)		enable_interrupts();	/* data polling for D7 */	start = get_timer (0);	addr = (vu_short *)dest;	while ((*addr & WRITE_CONFIRM_DATA) != (data & WRITE_CONFIRM_DATA)) {		if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {			return (1);		}	} 	mvdebug (("-write_halfword\n"));	return (0);}/*----------------------------------------------------------------------- * 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){	int result = 0;	if (write_halfword (info, dest, (data & ~FLASH_DATA_MASK) >> 16) == 0)	{		dest += 2;		data = data & FLASH_DATA_MASK;		result = write_halfword (info, dest, data);	}	return result;}#endif/*----------------------------------------------------------------------- */