}	}	/* If there are none at all that we recognise, bail */	if (!this->numchips) {		printk("No flash chips recognised.\n");		return;	}	/* Allocate an array to hold the information for each chip */	this->chips = kmalloc(sizeof(struct Nand) * this->numchips, GFP_KERNEL);	if (!this->chips){		printk("MTD: No memory for allocating chip info structures\n");		return;	}	/* Fill out the chip array with {floor, chipno} for each 	 * detected chip in the device. */	for (floor = 0, ret = 0; floor < MAX_FLOORS_MPLUS; 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);	printk(KERN_INFO "%d flash chips found. Total DiskOnChip size: %ld MiB\n",	       this->numchips ,this->totlen >> 20);}static int DoCMilPlus_is_alias(struct DiskOnChip *doc1, struct DiskOnChip *doc2){	int tmp1, tmp2, retval;	if (doc1->physadr == doc2->physadr)		return 1;	/* Use the alias resolution register which was set aside for this	 * purpose. If it's value is the same on both chips, they might	 * be the same chip, and we write to one and check for a change in	 * the other. It's unclear if this register is usuable in the	 * DoC 2000 (it's in the Millennium docs), but it seems to work. */	tmp1 = ReadDOC(doc1->virtadr, Mplus_AliasResolution);	tmp2 = ReadDOC(doc2->virtadr, Mplus_AliasResolution);	if (tmp1 != tmp2)		return 0;		WriteDOC((tmp1+1) % 0xff, doc1->virtadr, Mplus_AliasResolution);	tmp2 = ReadDOC(doc2->virtadr, Mplus_AliasResolution);	if (tmp2 == (tmp1+1) % 0xff)		retval = 1;	else		retval = 0;	/* Restore register contents.  May not be necessary, but do it just to	 * be safe. */	WriteDOC(tmp1, doc1->virtadr, Mplus_AliasResolution);	return retval;}static const char im_name[] = "DoCMilPlus_init";/* 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 <kaos@ocs.com.au> 29 Oct 2000. */static void DoCMilPlus_init(struct mtd_info *mtd){	struct DiskOnChip *this = mtd->priv;	struct DiskOnChip *old = NULL;	/* We must avoid being called twice for the same device. */	if (docmilpluslist)		old = docmilpluslist->priv;	while (old) {		if (DoCMilPlus_is_alias(this, old)) {			printk(KERN_NOTICE "Ignoring DiskOnChip Millennium "				"Plus at 0x%lX - already configured\n",				this->physadr);			iounmap(this->virtadr);			kfree(mtd);			return;		}		if (old->nextdoc)			old = old->nextdoc->priv;		else			old = NULL;	}	mtd->name = "DiskOnChip Millennium Plus";	printk(KERN_NOTICE "DiskOnChip Millennium Plus found at "		"address 0x%lX\n", this->physadr);	mtd->type = MTD_NANDFLASH;	mtd->flags = MTD_CAP_NANDFLASH;	mtd->ecctype = MTD_ECC_RS_DiskOnChip;	mtd->size = 0;	mtd->erasesize = 0;	mtd->oobblock = 512;	mtd->oobsize = 16;	mtd->owner = THIS_MODULE;	mtd->erase = doc_erase;	mtd->point = NULL;	mtd->unpoint = NULL;	mtd->read = doc_read;	mtd->write = doc_write;	mtd->read_ecc = doc_read_ecc;	mtd->write_ecc = doc_write_ecc;	mtd->read_oob = doc_read_oob;	mtd->write_oob = doc_write_oob;	mtd->sync = NULL;	this->totlen = 0;	this->numchips = 0;	this->curfloor = -1;	this->curchip = -1;	/* Ident all the chips present. */	DoC_ScanChips(this);	if (!this->totlen) {		kfree(mtd);		iounmap(this->virtadr);	} else {		this->nextdoc = docmilpluslist;		docmilpluslist = mtd;		mtd->size  = this->totlen;		mtd->erasesize = this->erasesize;		add_mtd_device(mtd);		return;	}}#if 0static int doc_dumpblk(struct mtd_info *mtd, loff_t from){	int i;	loff_t fofs;	struct DiskOnChip *this = mtd->priv;	void __iomem * docptr = this->virtadr;	struct Nand *mychip = &this->chips[from >> (this->chipshift)];	unsigned char *bp, buf[1056];	char c[32];	from &= ~0x3ff;	/* Don't allow read past end of device */	if (from >= this->totlen)		return -EINVAL;	DoC_CheckASIC(docptr);	/* Find the chip which is to be used and select it */	if (this->curfloor != mychip->floor) {		DoC_SelectFloor(docptr, mychip->floor);		DoC_SelectChip(docptr, mychip->chip);	} else if (this->curchip != mychip->chip) {		DoC_SelectChip(docptr, mychip->chip);	}	this->curfloor = mychip->floor;	this->curchip = mychip->chip;	/* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */	WriteDOC((DOC_FLASH_CE | DOC_FLASH_WP), docptr, Mplus_FlashSelect);	/* Reset the chip, see Software Requirement 11.4 item 1. */	DoC_Command(docptr, NAND_CMD_RESET, 0);	DoC_WaitReady(docptr);	fofs = from;	DoC_Command(docptr, DoC_GetDataOffset(mtd, &fofs), 0);	DoC_Address(this, 3, fofs, 0, 0x00);	WriteDOC(0, docptr, Mplus_FlashControl);	DoC_WaitReady(docptr);	/* disable the ECC engine */	WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);	ReadDOC(docptr, Mplus_ReadPipeInit);	ReadDOC(docptr, Mplus_ReadPipeInit);	/* Read the data via the internal pipeline through CDSN IO	   register, see Pipelined Read Operations 11.3 */	MemReadDOC(docptr, buf, 1054);	buf[1054] = ReadDOC(docptr, Mplus_LastDataRead);	buf[1055] = ReadDOC(docptr, Mplus_LastDataRead);	memset(&c[0], 0, sizeof(c));	printk("DUMP OFFSET=%x:\n", (int)from);        for (i = 0, bp = &buf[0]; (i < 1056); i++) {                if ((i % 16) == 0)                        printk("%08x: ", i);                printk(" %02x", *bp);                c[(i & 0xf)] = ((*bp >= 0x20) && (*bp <= 0x7f)) ? *bp : '.';                bp++;                if (((i + 1) % 16) == 0)                        printk("    %s\n", c);        }	printk("\n");	/* Disable flash internally */	WriteDOC(0, docptr, Mplus_FlashSelect);	return 0;}#endifstatic int doc_read(struct mtd_info *mtd, loff_t from, size_t len,		    size_t *retlen, u_char *buf){	/* Just a special case of doc_read_ecc */	return doc_read_ecc(mtd, from, len, retlen, buf, NULL, NULL);}static int doc_read_ecc(struct mtd_info *mtd, loff_t from, size_t len,			size_t *retlen, u_char *buf, u_char *eccbuf,			struct nand_oobinfo *oobsel){	int ret, i;	volatile char dummy;	loff_t fofs;	unsigned char syndrome[6];	struct DiskOnChip *this = mtd->priv;	void __iomem * docptr = this->virtadr;	struct Nand *mychip = &this->chips[from >> (this->chipshift)];	/* Don't allow read past end of device */	if (from >= this->totlen)		return -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;	DoC_CheckASIC(docptr);	/* Find the chip which is to be used and select it */	if (this->curfloor != mychip->floor) {		DoC_SelectFloor(docptr, mychip->floor);		DoC_SelectChip(docptr, mychip->chip);	} else if (this->curchip != mychip->chip) {		DoC_SelectChip(docptr, mychip->chip);	}	this->curfloor = mychip->floor;	this->curchip = mychip->chip;	/* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */	WriteDOC((DOC_FLASH_CE | DOC_FLASH_WP), docptr, Mplus_FlashSelect);	/* Reset the chip, see Software Requirement 11.4 item 1. */	DoC_Command(docptr, NAND_CMD_RESET, 0);	DoC_WaitReady(docptr);	fofs = from;	DoC_Command(docptr, DoC_GetDataOffset(mtd, &fofs), 0);	DoC_Address(this, 3, fofs, 0, 0x00);	WriteDOC(0, docptr, Mplus_FlashControl);	DoC_WaitReady(docptr);	if (eccbuf) {		/* init the ECC engine, see Reed-Solomon EDC/ECC 11.1 .*/		WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);		WriteDOC(DOC_ECC_EN, docptr, Mplus_ECCConf);	} else {		/* disable the ECC engine */		WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);	}	/* Let the caller know we completed it */	*retlen = len;        ret = 0;	ReadDOC(docptr, Mplus_ReadPipeInit);	ReadDOC(docptr, Mplus_ReadPipeInit);	if (eccbuf) {		/* Read the data via the internal pipeline through CDSN IO		   register, see Pipelined Read Operations 11.3 */		MemReadDOC(docptr, buf, len);		/* Read the ECC data following raw data */		MemReadDOC(docptr, eccbuf, 4);		eccbuf[4] = ReadDOC(docptr, Mplus_LastDataRead);		eccbuf[5] = ReadDOC(docptr, Mplus_LastDataRead);		/* Flush the pipeline */		dummy = ReadDOC(docptr, Mplus_ECCConf);		dummy = ReadDOC(docptr, Mplus_ECCConf);		/* Check the ECC Status */		if (ReadDOC(docptr, Mplus_ECCConf) & 0x80) {                        int nb_errors;			/* There was an ECC error */#ifdef ECC_DEBUG			printk("DiskOnChip ECC Error: Read at %lx\n", (long)from);#endif			/* Read the ECC syndrom through the DiskOnChip ECC logic.			   These syndrome will be all ZERO when there is no error */			for (i = 0; i < 6; i++)				syndrome[i] = ReadDOC(docptr, Mplus_ECCSyndrome0 + i);                        nb_errors = doc_decode_ecc(buf, syndrome);#ifdef ECC_DEBUG			printk("ECC Errors corrected: %x\n", nb_errors);#endif                        if (nb_errors < 0) {				/* We return error, but have actually done the read. Not that				   this can be told to user-space, via sys_read(), but at least				   MTD-aware stuff can know about it by checking *retlen */#ifdef ECC_DEBUG			printk("%s(%d): Millennium Plus ECC error (from=0x%x:\n",				__FILE__, __LINE__, (int)from);			printk("        syndrome= %02x:%02x:%02x:%02x:%02x:"				"%02x\n",				syndrome[0], syndrome[1], syndrome[2],				syndrome[3], syndrome[4], syndrome[5]);			printk("          eccbuf= %02x:%02x:%02x:%02x:%02x:"				"%02x\n",				eccbuf[0], eccbuf[1], eccbuf[2],				eccbuf[3], eccbuf[4], eccbuf[5]);#endif				ret = -EIO;                        }		}#ifdef PSYCHO_DEBUG		printk("ECC DATA at %lx: %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",		       (long)from, eccbuf[0], eccbuf[1], eccbuf[2], eccbuf[3],		       eccbuf[4], eccbuf[5]);#endif		/* disable the ECC engine */		WriteDOC(DOC_ECC_DIS, docptr , Mplus_ECCConf);	} else {		/* Read the data via the internal pipeline through CDSN IO		   register, see Pipelined Read Operations 11.3 */		MemReadDOC(docptr, buf, len-2);		buf[len-2] = ReadDOC(docptr, Mplus_LastDataRead);		buf[len-1] = ReadDOC(docptr, Mplus_LastDataRead);	}	/* Disable flash internally */	WriteDOC(0, docptr, Mplus_FlashSelect);	return ret;}static int doc_write(struct mtd_info *mtd, loff_t to, size_t len,		     size_t *retlen, const u_char *buf){	char eccbuf[6];	return doc_write_ecc(mtd, to, len, retlen, buf, eccbuf, NULL);}static int doc_write_ecc(struct mtd_info *mtd, loff_t to, size_t len,			 size_t *retlen, const u_char *buf, u_char *eccbuf,			 struct nand_oobinfo *oobsel){	int i, before, ret = 0;	loff_t fto;	volatile char dummy;	struct DiskOnChip *this = mtd->priv;	void __iomem * docptr = this->virtadr;	struct Nand *mychip = &this->chips[to >> (this->chipshift)];	/* Don't allow write past end of device */	if (to >= this->totlen)		return -EINVAL;	/* Don't allow writes which aren't exactly one block (512 bytes) */	if ((to & 0x1ff) || (len != 0x200))		return -EINVAL;	/* Determine position of OOB flags, before or after data */	before = (this->interleave && (to & 0x200));