flash.c

uboot在arm处理器s3c2410的移植代码

		   ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMDL323B) ||
		   ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM320B) ||
		   ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMDL324B)) {
		/* set sector offsets for bottom boot block type	*/
		for (i=0; i<8; ++i) {		/*  8 x 8k boot sectors	*/
			info->start[i] = base;
			base += 8 << 10;
		}
		while (i < info->sector_count) {	/* 64k regular sectors	*/
			info->start[i] = base;
			base += 64 << 10;
			++i;
		}
	} else if (((info->flash_id & FLASH_TYPEMASK) == FLASH_AMDL322T) ||
		   ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMDL323T) ||
		   ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM320T) ||
		   ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMDL324T)) {
		/* set sector offsets for top boot block type		*/
		base += info->size;
		i = info->sector_count;
		for (n=0; n<8; ++n) {		/*  8 x 8k boot sectors	*/
			base -= 8 << 10;
			--i;
			info->start[i] = base;
		}
		while (i > 0) {			/* 64k regular sectors	*/
			base -= 64 << 10;
			--i;
			info->start[i] = base;
		}
	} else if ((info->flash_id & FLASH_TYPEMASK) == FLASH_STMW320DT) {
		/* set sector offsets for top boot block type		*/
		base += info->size;
		i = info->sector_count;
		/*  1 x 16k boot sector */
		base -= 16 << 10;
		--i;
		info->start[i] = base;
		/*  2 x 8k  boot sectors */
		for (n=0; n<2; ++n) {
			base -= 8 << 10;
			--i;
			info->start[i] = base;
		}
		/*  1 x 32k boot sector */
		base -= 32 << 10;
		--i;
		info->start[i] = base;

		while (i > 0) {			/* 64k regular sectors	*/
			base -= 64 << 10;
			--i;
			info->start[i] = base;
		}
	} else {
	    if (info->flash_id & FLASH_BTYPE) {
		/* set sector offsets for bottom boot block type	*/
		info->start[0] = base + 0x00000000;
		info->start[1] = base + 0x00004000;
		info->start[2] = base + 0x00006000;
		info->start[3] = base + 0x00008000;
		for (i = 4; i < info->sector_count; i++) {
			info->start[i] = base + (i * 0x00010000) - 0x00030000;
		}
	    } else {
		/* set sector offsets for top boot block type		*/
		i = info->sector_count - 1;
		info->start[i--] = base + info->size - 0x00004000;
		info->start[i--] = base + info->size - 0x00006000;
		info->start[i--] = base + info->size - 0x00008000;
		for (; i >= 0; i--) {
			info->start[i] = base + i * 0x00010000;
		}
	    }
	}

	/* 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 CFG_FLASH_WORD_SIZE *)(info->start[i]);
		if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST)
		  info->protect[i] = 0;
		else
		  info->protect[i] = addr2[CFG_FLASH_READ2] & 1;
	}

	/*
	 * Prevent writes to uninitialized FLASH.
	 */
	if (info->flash_id != FLASH_UNKNOWN) {
		addr2 = (CFG_FLASH_WORD_SIZE *)info->start[0];
		*addr2 = (CFG_FLASH_WORD_SIZE)0x00F000F0;	/* reset bank */
	}

	return (info->size);
}


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

int	flash_erase (flash_info_t *info, int s_first, int s_last)
{
	volatile CFG_FLASH_WORD_SIZE *addr = (CFG_FLASH_WORD_SIZE *)(info->start[0]);
	volatile CFG_FLASH_WORD_SIZE *addr2;
	int flag, prot, sect, l_sect;
	ulong start, now, last;
	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!\n",
			prot);
	} else {
		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 = (CFG_FLASH_WORD_SIZE *)(info->start[sect]);
		    if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) {
			addr[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00AA00AA;
			addr[CFG_FLASH_ADDR1] = (CFG_FLASH_WORD_SIZE)0x00550055;
			addr[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00800080;
			addr[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00AA00AA;
			addr[CFG_FLASH_ADDR1] = (CFG_FLASH_WORD_SIZE)0x00550055;
			addr2[0] = (CFG_FLASH_WORD_SIZE)0x00500050;  /* block erase */
			for (i=0; i<50; i++)
			  udelay(1000);  /* wait 1 ms */
		    } else {
			if (sect == s_first) {
			    addr[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00AA00AA;
			    addr[CFG_FLASH_ADDR1] = (CFG_FLASH_WORD_SIZE)0x00550055;
			    addr[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00800080;
			    addr[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00AA00AA;
			    addr[CFG_FLASH_ADDR1] = (CFG_FLASH_WORD_SIZE)0x00550055;
			}
			addr2[0] = (CFG_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 = (CFG_FLASH_WORD_SIZE *)(info->start[l_sect]);
	while ((addr[0] & (CFG_FLASH_WORD_SIZE)0x00800080) != (CFG_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 */
			putc ('.');
			last = now;
		}
	}

DONE:
	/* reset to read mode */
	addr = (CFG_FLASH_WORD_SIZE *)info->start[0];
	addr[0] = (CFG_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) {
#ifdef CONFIG_B2
			data = data | ((*(uchar *)cp)<<(8*i));
#else
			data = (data << 8) | (*(uchar *)cp);
#endif
		}
		for (; i<4 && cnt>0; ++i) {
#ifdef CONFIG_B2
			data = data  | ((*src++)<<(8*i));
#else
			data = (data << 8) | *src++;
#endif
			--cnt;
			++cp;
		}
		for (; cnt==0 && i<4; ++i, ++cp) {
#ifdef CONFIG_B2
			data = data | ((*(uchar *)cp)<<(8*i));
#else
			data = (data << 8) | (*(uchar *)cp);
#endif
		}

		if ((rc = write_word(info, wp, data)) != 0) {
			return (rc);
		}
		wp += 4;
	}

	/*
	 * handle word aligned part
	 */
	while (cnt >= 4) {
		data = 0;
#ifdef CONFIG_B2
		data = (*(ulong*)src);
		src += 4;
#else
		for (i=0; i<4; ++i) {
			data = (data << 8) | *src++;
		}
#endif
		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) {
#ifdef CONFIG_B2
		data = data  | ((*src++)<<(8*i));
#else
		data = (data << 8) | *src++;
#endif
		--cnt;
	}
	for (; i<4; ++i, ++cp) {
#ifdef CONFIG_B2
		data = data | ((*(uchar *)cp)<<(8*i));
#else
		data = (data << 8) | (*(uchar *)cp);
#endif
	}

	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 CFG_FLASH_WORD_SIZE *addr2 = (CFG_FLASH_WORD_SIZE *)(info->start[0]);
	volatile CFG_FLASH_WORD_SIZE *dest2 = (CFG_FLASH_WORD_SIZE *)dest;
	volatile CFG_FLASH_WORD_SIZE *data2 = (CFG_FLASH_WORD_SIZE *)&data;
	ulong start;
	int flag;
	int i;

	/* Check if Flash is (sufficiently) erased */
	if ((*((volatile ulong *)dest) & data) != data) {
		return (2);
	}
	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts();

	for (i=0; i<4/sizeof(CFG_FLASH_WORD_SIZE); i++)
	  {
	    addr2[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00AA00AA;
	    addr2[CFG_FLASH_ADDR1] = (CFG_FLASH_WORD_SIZE)0x00550055;
	    addr2[CFG_FLASH_ADDR0] = (CFG_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] & (CFG_FLASH_WORD_SIZE)0x00800080) !=
		   (data2[i] & (CFG_FLASH_WORD_SIZE)0x00800080)) {
	      if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
		return (1);
	      }
	    }
	  }

	return (0);
}

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