cmd_doc.c

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	volatile int dummy;
	int modulus = 0xffff;
	unsigned long docptr;
	int i;

	docptr = doc->virtadr;

	if (len <= 0)
		return;

	if (DoC_is_Millennium(doc)) {
		/* Read the data via the internal pipeline through CDSN IO register,
		   see Pipelined Read Operations 11.3 */
		dummy = ReadDOC(docptr, ReadPipeInit);

		/* Millennium should use the LastDataRead register - Pipeline Reads */
		len--;

		/* This is needed for correctly ECC calculation */
		modulus = 0xff;
	}

	for (i = 0; i < len; i++)
		buf[i] = ReadDOC_(docptr, doc->ioreg + (i & modulus));

	if (DoC_is_Millennium(doc)) {
		buf[i] = ReadDOC(docptr, LastDataRead);
	}
}

/* Write a buffer to DoC, taking care of Millennium oddities */
static void DoC_WriteBuf(struct DiskOnChip *doc, const u_char * buf, int len)
{
	unsigned long docptr;
	int i;

	docptr = doc->virtadr;

	if (len <= 0)
		return;

	for (i = 0; i < len; i++)
		WriteDOC_(buf[i], docptr, doc->ioreg + i);

	if (DoC_is_Millennium(doc)) {
		WriteDOC(0x00, docptr, WritePipeTerm);
	}
}


/* DoC_SelectChip: Select a given flash chip within the current floor */

static inline int DoC_SelectChip(struct DiskOnChip *doc, int chip)
{
	unsigned long docptr = doc->virtadr;

	/* Software requirement 11.4.4 before writing DeviceSelect */
	/* Deassert the CE line to eliminate glitches on the FCE# outputs */
	WriteDOC(CDSN_CTRL_WP, docptr, CDSNControl);
	DoC_Delay(doc, 4);	/* Software requirement 11.4.3 for Millennium */

	/* Select the individual flash chip requested */
	WriteDOC(chip, docptr, CDSNDeviceSelect);
	DoC_Delay(doc, 4);

	/* Reassert the CE line */
	WriteDOC(CDSN_CTRL_CE | CDSN_CTRL_FLASH_IO | CDSN_CTRL_WP, docptr,
		 CDSNControl);
	DoC_Delay(doc, 4);	/* Software requirement 11.4.3 for Millennium */

	/* Wait for it to be ready */
	return DoC_WaitReady(doc);
}

/* DoC_SelectFloor: Select a given floor (bank of flash chips) */

static inline int DoC_SelectFloor(struct DiskOnChip *doc, int floor)
{
	unsigned long docptr = doc->virtadr;

	/* Select the floor (bank) of chips required */
	WriteDOC(floor, docptr, FloorSelect);

	/* Wait for the chip to be ready */
	return DoC_WaitReady(doc);
}

/* DoC_IdentChip: Identify a given NAND chip given {floor,chip} */

static int DoC_IdentChip(struct DiskOnChip *doc, int floor, int chip)
{
	int mfr, id, i;
	volatile char dummy;

	/* Page in the required floor/chip */
	DoC_SelectFloor(doc, floor);
	DoC_SelectChip(doc, chip);

	/* Reset the chip */
	if (DoC_Command(doc, NAND_CMD_RESET, CDSN_CTRL_WP)) {
#ifdef DOC_DEBUG
		printf("DoC_Command (reset) for %d,%d returned true\n",
		       floor, chip);
#endif
		return 0;
	}


	/* Read the NAND chip ID: 1. Send ReadID command */
	if (DoC_Command(doc, NAND_CMD_READID, CDSN_CTRL_WP)) {
#ifdef DOC_DEBUG
		printf("DoC_Command (ReadID) for %d,%d returned true\n",
		       floor, chip);
#endif
		return 0;
	}

	/* Read the NAND chip ID: 2. Send address byte zero */
	DoC_Address(doc, ADDR_COLUMN, 0, CDSN_CTRL_WP, 0);

	/* Read the manufacturer and device id codes from the device */

	/* CDSN Slow IO register see Software Requirement 11.4 item 5. */
	dummy = ReadDOC(doc->virtadr, CDSNSlowIO);
	DoC_Delay(doc, 2);
	mfr = ReadDOC_(doc->virtadr, doc->ioreg);

	/* CDSN Slow IO register see Software Requirement 11.4 item 5. */
	dummy = ReadDOC(doc->virtadr, CDSNSlowIO);
	DoC_Delay(doc, 2);
	id = ReadDOC_(doc->virtadr, doc->ioreg);

	/* No response - return failure */
	if (mfr == 0xff || mfr == 0)
		return 0;

	/* Check it's the same as the first chip we identified.
	 * M-Systems say that any given DiskOnChip device should only
	 * contain _one_ type of flash part, although that's not a
	 * hardware restriction. */
	if (doc->mfr) {
		if (doc->mfr == mfr && doc->id == id)
			return 1;	/* This is another the same the first */
		else
			printf("Flash chip at floor %d, chip %d is different:\n",
			       floor, chip);
	}

	/* Print and store the manufacturer and ID codes. */
	for (i = 0; nand_flash_ids[i].name != NULL; i++) {
		if (mfr == nand_flash_ids[i].manufacture_id &&
		    id == nand_flash_ids[i].model_id) {
#ifdef DOC_DEBUG
			printf("Flash chip found: Manufacturer ID: %2.2X, "
			       "Chip ID: %2.2X (%s)\n", mfr, id,
			       nand_flash_ids[i].name);
#endif
			if (!doc->mfr) {
				doc->mfr = mfr;
				doc->id = id;
				doc->chipshift =
				    nand_flash_ids[i].chipshift;
				doc->page256 = nand_flash_ids[i].page256;
				doc->pageadrlen =
				    nand_flash_ids[i].pageadrlen;
				doc->erasesize =
				    nand_flash_ids[i].erasesize;
				doc->chips_name =
				    nand_flash_ids[i].name;
				return 1;
			}
			return 0;
		}
	}


#ifdef DOC_DEBUG
	/* We haven't fully identified the chip. Print as much as we know. */
	printf("Unknown flash chip found: %2.2X %2.2X\n",
	       id, mfr);
#endif

	return 0;
}

/* DoC_ScanChips: Find all NAND chips present in a DiskOnChip, and identify them */

static void DoC_ScanChips(struct DiskOnChip *this)
{
	int floor, chip;
	int numchips[MAX_FLOORS];
	int maxchips = MAX_CHIPS;
	int ret = 1;

	this->numchips = 0;
	this->mfr = 0;
	this->id = 0;

	if (DoC_is_Millennium(this))
		maxchips = MAX_CHIPS_MIL;

	/* For each floor, find the number of valid chips it contains */
	for (floor = 0; floor < MAX_FLOORS; floor++) {
		ret = 1;
		numchips[floor] = 0;
		for (chip = 0; chip < maxchips && ret != 0; chip++) {

			ret = DoC_IdentChip(this, floor, chip);
			if (ret) {
				numchips[floor]++;
				this->numchips++;
			}
		}
	}

	/* If there are none at all that we recognise, bail */
	if (!this->numchips) {
		puts ("No flash chips recognised.\n");
		return;
	}

	/* Allocate an array to hold the information for each chip */
	this->chips = malloc(sizeof(struct Nand) * this->numchips);
	if (!this->chips) {
		puts ("No memory for allocating chip info structures\n");
		return;
	}

	ret = 0;

	/* Fill out the chip array with {floor, chipno} for each
	 * detected chip in the device. */
	for (floor = 0; floor < MAX_FLOORS; floor++) {
		for (chip = 0; chip < numchips[floor]; chip++) {
			this->chips[ret].floor = floor;
			this->chips[ret].chip = chip;
			this->chips[ret].curadr = 0;
			this->chips[ret].curmode = 0x50;
			ret++;
		}
	}

	/* Calculate and print the total size of the device */
	this->totlen = this->numchips * (1 << this->chipshift);

#ifdef DOC_DEBUG
	printf("%d flash chips found. Total DiskOnChip size: %ld MB\n",
	       this->numchips, this->totlen >> 20);
#endif
}

/* find_boot_record: Find the NFTL Media Header and its Spare copy which contains the
 *	various device information of the NFTL partition and Bad Unit Table. Update
 *	the ReplUnitTable[] table accroding to the Bad Unit Table. ReplUnitTable[]
 *	is used for management of Erase Unit in other routines in nftl.c and nftlmount.c
 */
static int find_boot_record(struct NFTLrecord *nftl)
{
	struct nftl_uci1 h1;
	struct nftl_oob oob;
	unsigned int block, boot_record_count = 0;
	int retlen;
	u8 buf[SECTORSIZE];
	struct NFTLMediaHeader *mh = &nftl->MediaHdr;
	unsigned int i;

	nftl->MediaUnit = BLOCK_NIL;
	nftl->SpareMediaUnit = BLOCK_NIL;

	/* search for a valid boot record */
	for (block = 0; block < nftl->nb_blocks; block++) {
		int ret;

		/* Check for ANAND header first. Then can whinge if it's found but later
		   checks fail */
		if ((ret = doc_read_ecc(nftl->mtd, block * nftl->EraseSize, SECTORSIZE,
					&retlen, buf, NULL))) {
			static int warncount = 5;

			if (warncount) {
				printf("Block read at 0x%x failed\n", block * nftl->EraseSize);
				if (!--warncount)
					puts ("Further failures for this block will not be printed\n");
			}
			continue;
		}

		if (retlen < 6 || memcmp(buf, "ANAND", 6)) {
			/* ANAND\0 not found. Continue */
#ifdef PSYCHO_DEBUG
			printf("ANAND header not found at 0x%x\n", block * nftl->EraseSize);
#endif
			continue;
		}

#ifdef NFTL_DEBUG
		printf("ANAND header found at 0x%x\n", block * nftl->EraseSize);
#endif

		/* To be safer with BIOS, also use erase mark as discriminant */
		if ((ret = doc_read_oob(nftl->mtd, block * nftl->EraseSize + SECTORSIZE + 8,
				8, &retlen, (char *)&h1) < 0)) {
#ifdef NFTL_DEBUG
			printf("ANAND header found at 0x%x, but OOB data read failed\n",
			       block * nftl->EraseSize);
#endif
			continue;
		}

		/* OK, we like it. */

		if (boot_record_count) {
			/* We've already processed one. So we just check if
			   this one is the same as the first one we found */
			if (memcmp(mh, buf, sizeof(struct NFTLMediaHeader))) {
#ifdef NFTL_DEBUG
				printf("NFTL Media Headers at 0x%x and 0x%x disagree.\n",
				       nftl->MediaUnit * nftl->EraseSize, block * nftl->EraseSize);
#endif
				/* if (debug) Print both side by side */
				return -1;
			}
			if (boot_record_count == 1)
				nftl->SpareMediaUnit = block;

			boot_record_count++;
			continue;
		}

		/* This is the first we've seen. Copy the media header structure into place */
		memcpy(mh, buf, sizeof(struct NFTLMediaHeader));

		/* Do some sanity checks on it */
		if (mh->UnitSizeFactor == 0) {
#ifdef NFTL_DEBUG
			puts ("UnitSizeFactor 0x00 detected.\n"
			      "This violates the spec but we think we know what it means...\n");
#endif
		} else if (mh->UnitSizeFactor != 0xff) {
			printf ("Sorry, we don't support UnitSizeFactor "
			      "of != 1 yet.\n");
			return -1;
		}

		nftl->nb_boot_blocks = le16_to_cpu(mh->FirstPhysicalEUN);
		if ((nftl->nb_boot_blocks + 2) >= nftl->nb_blocks) {
			printf ("NFTL Media Header sanity check failed:\n"
				"nb_boot_blocks (%d) + 2 > nb_blocks (%d)\n",
				nftl->nb_boot_blocks, nftl->nb_blocks);
			return -1;
		}

		nftl->numvunits = le32_to_cpu(mh->FormattedSize) / nftl->EraseSize;
		if (nftl->numvunits > (nftl->nb_blocks - nftl->nb_boot_blocks - 2)) {
			printf ("NFTL Media Header sanity check failed:\n"
				"numvunits (%d) > nb_blocks (%d) - nb_boot_blocks(%d) - 2\n",
				nftl->numvunits,
				nftl->nb_blocks,
				nftl->nb_boot_blocks);
			return -1;
		}

		nftl->nr_sects  = nftl->numvunits * (nftl->EraseSize / SECTORSIZE);

		/* If we're not using the last sectors in the device for some reason,
		   reduce nb_blocks accordingly so we forget they're there */
		nftl->nb_blocks = le16_to_cpu(mh->NumEraseUnits) + le16_to_cpu(mh->FirstPhysicalEUN);

		/* read the Bad Erase Unit Table and modify ReplUnitTable[] accordingly */
		for (i = 0; i < nftl->nb_blocks; i++) {
			if ((i & (SECTORSIZE - 1)) == 0) {
				/* read one sector for every SECTORSIZE of blocks */
				if ((ret = doc_read_ecc(nftl->mtd, block * nftl->EraseSize +
						       i + SECTORSIZE, SECTORSIZE,
						       &retlen, buf, (char *)&oob)) < 0) {
					puts ("Read of bad sector table failed\n");
					return -1;
				}
			}
			/* mark the Bad Erase Unit as RESERVED in ReplUnitTable */
			if (buf[i & (SECTORSIZE - 1)] != 0xff)
				nftl->ReplUnitTable[i] = BLOCK_RESERVED;
		}

		nftl->MediaUnit = block;
		boot_record_count++;

	} /* foreach (block) */

	return boot_record_count?0:-1;
}

/* This routine is made available to other mtd code via
 * inter_module_register.  It must only be accessed through
 * inter_module_get which will bump the use count of this module.  The
 * addresses passed back in mtd are valid as long as the use count of
 * this module is non-zero, i.e. between inter_module_get and
 * inter_module_put.  Keith Owens <[e-mail]> 29 Oct 2000.
 */
static void DoC2k_init(struct DiskOnChip* this)
{
	struct NFTLrecord *nftl;

	switch (this->ChipID) {
	case DOC_ChipID_Doc2k:
		this->name = "DiskOnChip 2000";
		this->ioreg = DoC_2k_CDSN_IO;
		break;
	case DOC_ChipID_DocMil:
		this->name = "DiskOnChip Millennium";
		this->ioreg = DoC_Mil_CDSN_IO;
		break;
	}

#ifdef DOC_DEBUG
	printf("%s found at address 0x%lX\n", this->name,
	       this->physadr);
#endif

	this->totlen = 0;
	this->numchips = 0;

	this->curfloor = -1;
	this->curchip = -1;

	/* Ident all the chips present. */
	DoC_ScanChips(this);
	if ((!this->numchips) || (!this->chips))
		return;

	nftl = &this->nftl;

	/* Get physical parameters */
	nftl->EraseSize = this->erasesize;
	nftl->nb_blocks = this->totlen / this->erasesize;
	nftl->mtd = this;

	if (find_boot_record(nftl) != 0)
		this->nftl_found = 0;
	else
		this->nftl_found = 1;

	printf("%s @ 0x%lX, %ld MB\n", this->name, this->physadr, this->totlen >> 20);
}

int doc_read_ecc(struct DiskOnChip* this, loff_t from, size_t len,
		 size_t * retlen, u_char * buf, u_char * eccbuf)
{
	unsigned long docptr;
	struct Nand *mychip;
	unsigned char syndrome[6];
	volatile char dummy;
	int i, len256 = 0, ret=0;

	docptr = this->virtadr;

	/* Don't allow read past end of device */
	if (from >= this->totlen) {
		puts ("Out of flash\n");
		return DOC_EINVAL;
	}

	/* Don't allow a single read to cross a 512-byte block boundary */
	if (from + len > ((from | 0x1ff) + 1))
		len = ((from | 0x1ff) + 1) - from;

	/* The ECC will not be calculated correctly if less than 512 is read */
	if (len != 0x200 && eccbuf)
		printf("ECC needs a full sector read (adr: %lx size %lx)\n",
		       (long) from, (long) len);

#ifdef PSYCHO_DEBUG
	printf("DoC_Read (adr: %lx size %lx)\n", (long) from, (long) len);
#endif

	/* Find the chip which is to be used and select it */
	mychip = &this->chips[shr(from, this->chipshift)];

	if (this->curfloor != mychip->floor) {
		DoC_SelectFloor(this, mychip->floor);
		DoC_SelectChip(this, mychip->chip);
	} else if (this->curchip != mychip->chip) {
		DoC_SelectChip(this, mychip->chip);
	}

	this->curfloor = mychip->floor;
	this->curchip = mychip->chip;

	DoC_Command(this,
		    (!this->page256
		     && (from & 0x100)) ? NAND_CMD_READ1 : NAND_CMD_READ0,
		    CDSN_CTRL_WP);
	DoC_Address(this, ADDR_COLUMN_PAGE, from, CDSN_CTRL_WP,
		    CDSN_CTRL_ECC_IO);

	if (eccbuf) {
		/* Prime the ECC engine */
		WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
		WriteDOC(DOC_ECC_EN, docptr, ECCConf);
	} else {
		/* disable the ECC engine */
		WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
		WriteDOC(DOC_ECC_DIS, docptr, ECCConf);
	}

	/* treat crossing 256-byte sector for 2M x 8bits devices */
	if (this->page256 && from + len > (from | 0xff) + 1) {
		len256 = (from | 0xff) + 1 - from;
		DoC_ReadBuf(this, buf, len256);

		DoC_Command(this, NAND_CMD_READ0, CDSN_CTRL_WP);
		DoC_Address(this, ADDR_COLUMN_PAGE, from + len256,
			    CDSN_CTRL_WP, CDSN_CTRL_ECC_IO);
	}

	DoC_ReadBuf(this, &buf[len256], len - len256);

	/* Let the caller know we completed it */
	*retlen = len;

	if (eccbuf) {
		/* Read the ECC data through the DiskOnChip ECC logic */
		/* Note: this will work even with 2M x 8bit devices as   */
		/*       they have 8 bytes of OOB per 256 page. mf.      */
		DoC_ReadBuf(this, eccbuf, 6);

		/* Flush the pipeline */
		if (DoC_is_Millennium(this)) {
			dummy = ReadDOC(docptr, ECCConf);
			dummy = ReadDOC(docptr, ECCConf);