~smc_core.c

针对远峰2410开发板的vivi移植

	/* Mask to get column */
	offset = to & 0x1f;

	/* Initialize return length value */
	*retlen = 0;

	/* Do not allow write past end of page */
	if ((offset + len) > mtd->oobsize) {
		DEBUG(MTD_DEBUG_LEVEL0,
			__FUNCTION__"(): Attempt to write past end of page\n");
		return -EINVAL;
	}

	/* Select the NAND device */
	nand_select();

	/* Check the WP bit */
	nand_command(mtd, NAND_CMD_STATUS, -1, -1);

	this->wait_for_ready();

	if (!(this->read_data() & SMC_STAT_NOT_WP)) {
		DEBUG(MTD_DEBUG_LEVEL0,
			__FUNCTION__"(): Device is write protected!!!\n");
		ret = -EPERM;
		goto nand_write_oob_err;
	}

	/* Write out desired data */
	nand_command(mtd, NAND_CMD_SEQIN, offset + mtd->oobblock, page);
	this->hwcontrol(NAND_CTL_DAT_OUT);
	for (i = 0; i < len; i++)
		this->write_data(buf[i]);
	this->hwcontrol(NAND_CTL_DAT_IN);

	/* Send command to program the OOB data */
	nand_command(mtd, NAND_CMD_PAGEPROG, -1, -1);

	this->wait_for_ready();

	/*
	 * Wait for program operation to complete. This could
	 * take up to 3000us (3ms) on some devices, so we try
	 * and exit as quickly as possible.
	 */
	status = 0;
	for (i = 0; i < 24; i++) {
		/* Delay for 125us */
		udelay(125);

		/* Check the status */
		nand_command(mtd, NAND_CMD_STATUS, -1, -1);

		this->wait_for_ready();

		status = (int)this->read_data();
		if (status & SMC_STAT_READY)
			break;
	}

	/* See if device thinks it succeeded */
	if (status & SMC_STAT_WRITE_ERR) {
		DEBUG(MTD_DEBUG_LEVEL0,
			__FUNCTION__"(): Failed write, page 0x%08x\n", page);
		ret = -EIO;
		goto nand_write_oob_err;
	}

#ifdef CONFIG_MTD_NAND_VERIFY_WRITE
	/* Send command to read back the data */
	nand_command(mtd, NAND_CMD_READOOB, offset, page);

	this->wait_for_ready();

	/* Loop through and verify the data */
	for (i = 0; i < len; i++) {
		if (buf[i] != this->read_data()) {
			DEBUG(MTD_DEBUG_LEVEL0,
				__FUNCTION__"(): Failed write verify, page 0x%08x\n",
				page);
			ret = -EIO;
			goto nand_write_oob_err;
		}
	}
#endif

	/* Return happy */
	*retlen = len;
	ret = 0;
	
nand_write_oob_err:
	/* De-select the NAND device */
	nand_deselect();

	return ret;
}

/*
 * NAND erase a block
 */
static int
nand_erase(struct mtd_info *mtd, struct erase_info *instr)
{
	int i, page, len, status, pages_per_block;
	struct nand_chip *this = mtd->priv;

	DEBUG(MTD_DEBUG_LEVEL3,
		__FUNCTION__"(): start = 0x%08x, len = %i\n",
		(unsigned int)instr->addr, (unsigned int)instr->len);

	/* Start address must aligned on block boundary */
	if (instr->addr & (mtd->erasesize - 1)) {
		DEBUG(MTD_DEBUG_LEVEL0,
			__FUNCTION__"(): Unaligned address\n");
		return -EINVAL;
	}

	/* Length must align on block boundary */
	if (instr->len & (mtd->erasesize - 1)) {
		DEBUG(MTD_DEBUG_LEVEL0,
			__FUNCTION__"(): Length not block aligned\n");
		return -EINVAL;
	}

	/* Do not allow erase past end of device */
	if ((instr->len + instr->addr) > mtd->size) {
		DEBUG(MTD_DEBUG_LEVEL0,
			__FUNCTION__"(): Erase past end of device\n");
		return -EINVAL;
	}

	/* Shift to get first page */
	page = (int)(instr->addr >> this->page_shift);

	/* Calculate pages in each block */
	pages_per_block = mtd->erasesize / mtd->oobblock;

	/* Select the NAND device */
	nand_select();

	/* Check the WP bit */
	nand_command(mtd, NAND_CMD_STATUS, -1, -1);

	this->wait_for_ready();

	if (!(this->read_data() & SMC_STAT_NOT_WP)) {
		DEBUG(MTD_DEBUG_LEVEL0,
			__FUNCTION__"(): Device is write protected!!!\n");
		nand_deselect();
		return -EIO;
	}

	/* Loop through the pages */
	len = instr->len;
	while (len) {
		/* Send commands to erase a page */
		nand_command(mtd, NAND_CMD_ERASE1, -1, page);
		nand_command(mtd, NAND_CMD_ERASE2, -1, -1);

		this->wait_for_ready();

		/*
		 * Wait for program operation to complete. This could
		 * take up to 4000us (4ms) on some devices, so we try
		 * and exit as quickly as possible.
		 */
		status = 0;
		for (i = 0; i < 32; i++) {
			/* Delay for 125us */
			udelay(125);

			/* Check the status */
			nand_command(mtd, NAND_CMD_STATUS, -1, -1);

			this->wait_for_ready();

			status = (int)this->read_data();
			if (status & SMC_STAT_READY)
				break;
		}

		/* See if block erase succeeded */
		if (status & SMC_STAT_WRITE_ERR) {
			DEBUG(MTD_DEBUG_LEVEL0,
				__FUNCTION__"(): Failed erase, page 0x%08x\n", page);
			nand_deselect();
#if 0
			instr->state = MTD_ERASE_FAILED;
			if (instr->callback)
				instr->callback(instr);
#endif
			return -EIO;
		}

		/* Increment page address and decrement length */
		len -= mtd->erasesize;
		page += pages_per_block;
	}

	/* De-select the NAND device */
	nand_deselect();

#if 0
	/* Do call back function */
	instr->state = MTD_ERASE_DONE;
	if (instr->callback)
		instr->callback(instr);
#endif

	/* Return happy */
	return 0;	
}

/*
 * Scan for the SMC device
 */
int
smc_scan(struct mtd_info *mtd)
{
	int i, nand_maf_id, nand_dev_id;
	struct nand_chip *this = mtd->priv;

	/* Select the device */
	nand_select();

	/* Send the command for reading device ID */
	nand_command(mtd, NAND_CMD_READID, 0x00, -1);

	this->wait_for_ready();

	/* Read manufacturer and device IDs */
	nand_maf_id = this->read_data();
	nand_dev_id = this->read_data();

	/* Print and store flash device information */
	for (i = 0; nand_flash_ids[i].name != NULL; i++) {

		if (nand_dev_id != nand_flash_ids[i].id)
			continue;

		if (!mtd->name) mtd->name = nand_flash_ids[i].name;
		this->chipsize = nand_flash_ids[i].chipsize << 20;

		/* New devices have all the information in additional id bytes */
		if (!nand_flash_ids[i].pagesize) {
			int extid;
			/* The 3rd id byte contains non relevant data ATM */
			extid = this->read_byte(mtd);
			/* The 4th id byte is the important one */
			extid = this->read_byte(mtd);
			/* Calc pagesize */
			mtd->oobblock = 1024 << (extid & 0x3);
			extid >>= 2;
			/* Calc oobsize */
			mtd->oobsize = (8 << (extid & 0x01)) * (mtd->oobblock >> 9);
			extid >>= 2;
			/* Calc blocksize. Blocksize is multiples of 64KiB */
			mtd->erasesize = (64 * 1024)  << (extid & 0x03);
			extid >>= 2;
			/* Get buswidth information */
			busw = (extid & 0x01) ? NAND_BUSWIDTH_16 : 0;

		} else {
			/* Old devices have this data hardcoded in the
			 * device id table */
			mtd->erasesize = nand_flash_ids[i].erasesize;
			mtd->oobblock = nand_flash_ids[i].pagesize;
			mtd->oobsize = mtd->oobblock / 32;
			busw = nand_flash_ids[i].options & NAND_BUSWIDTH_16;
		}

		/* Try to identify manufacturer */
		for (maf_id = 0; nand_manuf_ids[maf_id].id != 0x0; maf_id++) {
			if (nand_manuf_ids[maf_id].id == nand_maf_id)
				break;
		}

		/* Check, if buswidth is correct. Hardware drivers should set
		 * this correct ! */
		if (busw != (this->options & NAND_BUSWIDTH_16)) {
			printk (KERN_INFO "NAND device: Manufacturer ID:"
				" 0x%02x, Chip ID: 0x%02x (%s %s)e\n", nand_maf_id, nand_dev_id,
				nand_manuf_ids[maf_id].name , mtd->name);
			printk (KERN_WARNING
				"NAND bus width %d instead %d bit\n",
					(this->options & NAND_BUSWIDTH_16) ? 16 : 8,
					busw ? 16 : 8);
			this->select_chip(mtd, -1);
			return 1;
		}

		/* Calculate the address shift from the page size */
		this->page_shift = ffs(mtd->oobblock) - 1;
		this->bbt_erase_shift = this->phys_erase_shift = ffs(mtd->erasesize) - 1;
		this->chip_shift = ffs(this->chipsize) - 1;
		
		/* Set the bad block position */
		this->badblockpos = mtd->oobblock > 512 ?
			NAND_LARGE_BADBLOCK_POS : NAND_SMALL_BADBLOCK_POS;

		/* Get chip options, preserve non chip based options */
		this->options &= ~NAND_CHIPOPTIONS_MSK;
		this->options |= nand_flash_ids[i].options & NAND_CHIPOPTIONS_MSK;
		/* Set this as a default. Board drivers can override it, if neccecary */
		this->options |= NAND_NO_AUTOINCR;
		/* Check if this is a not a samsung device. Do not clear the options
		 * for chips which are not having an extended id.
		 */
		if (nand_maf_id != NAND_MFR_SAMSUNG && !nand_flash_ids[i].pagesize)
			this->options &= ~NAND_SAMSUNG_LP_OPTIONS;

		/* Check for AND chips with 4 page planes */
		if (this->options & NAND_4PAGE_ARRAY)
			this->erase_cmd = multi_erase_cmd;
		else
			this->erase_cmd = single_erase_cmd;

		/* Do not replace user supplied command function ! */
		if (mtd->oobblock > 512 && this->cmdfunc == nand_command)
			this->cmdfunc = nand_command_lp;

//		printk (KERN_INFO "NAND device: page_shift:%d"
//			"bbt_erase_shift %d, chip_shift: %d \n", this->page_shift, this->bbt_erase_shift,
//			this->chip_shift);
		printk (KERN_INFO "NAND device: Manufacturer ID:"
			" 0x%02x, Chip ID: 0x%02x (%s %s)\n", nand_maf_id, nand_dev_id,
			nand_manuf_ids[maf_id].name , nand_flash_ids[i].name);
		break;
	}
	
	
	/* Print and sotre flash device information */
	for (i = 0; nand_flash_ids[i].name != NULL; i++) {
		if (nand_maf_id == nand_flash_ids[i].manufacture_id &&
		    nand_dev_id == nand_flash_ids[i].model_id) {
/*#ifdef USE_256BYTE_NAND_FLASH
			if (!mtd->size) {
				mtd->name = nand_flash_ids[i].name;
				mtd->erasesize = nand_flash_ids[i].erasesize;
				mtd->size = (1 << nand_flash_ids[i].chipshift);
				mtd->eccsize = 256;
				if (nand_flash_ids[i].page256) {
					mtd->oobblock = 256;
					mtd->oobsize = 8;
					this->page_shift = 8;
				} else {
					mtd->oobblock = 512;
					mtd->oobsize = 16;
					this->page_shift = 9;
				}
				this->dev = &nand_smc_info[GET_DI_NUM(nand_flash_ids[i].chipshift)];
			}
#else
			if (!(mtd->size) && !(nand_flash_ids[i].page256)) {
				mtd->name = nand_flash_ids[i].name;
				mtd->erasesize = nand_flash_ids[i].erasesize;
				mtd->size = (1 << nand_flash_ids[i].chipshift);
				mtd->eccsize = 256;
				//mtd->oobblock = 512;
				//mtd->oobsize = 16;
				//this->page_shift = 9;
				mtd->oobblock = 2048;
				mtd->oobsize = 64;
				this->page_shift = 12;
				this->dev = &nand_smc_info[GET_DI_NUM(nand_flash_ids[i].chipshift)];
			}
#endif*/
            mtd->name = nand_flash_ids[i].name;
            mtd->size = (1 << nand_flash_ids[i].chipshift);
            /* New devices have all the information in additional id bytes */
    		if (!nand_flash_ids[i].pagesize) {
    			int extid;
    			/* The 3rd id byte contains non relevant data ATM */
    			extid = this->read_byte(mtd);
    			/* The 4th id byte is the important one */
    			extid = this->read_byte(mtd);
    			/* Calc pagesize */
    			mtd->oobblock = 1024 << (extid & 0x3);
    			extid >>= 2;
    			/* Calc oobsize */
    			mtd->oobsize = (8 << (extid & 0x01)) * (mtd->oobblock >> 9);
    			extid >>= 2;
    			/* Calc blocksize. Blocksize is multiples of 64KiB */
    			mtd->erasesize = (64 * 1024)  << (extid & 0x03);
    			extid >>= 2;
    			/* Get buswidth information */
    			busw = (extid & 0x01) ? NAND_BUSWIDTH_16 : 0;
    
    		} else {
    			/* Old devices have this data hardcoded in the
    			 * device id table */
    			mtd->erasesize = nand_flash_ids[i].erasesize;
    			mtd->oobblock = nand_flash_ids[i].pagesize;
    			mtd->oobsize = mtd->oobblock / 32;
    			busw = nand_flash_ids[i].options & NAND_BUSWIDTH_16;
    		}
		
			printk("NAND device: Manufacture ID:" \
				" 0x%02x, Chip ID: 0x%02x (%s)\n",
				nand_maf_id, nand_dev_id, mtd->name);
			break;
		}	    
	}

	/* De-select the device */
	nand_deselect();

	/* Print warning message for no device */
	if (!mtd->size) {
		printk("No NAND device found!!!\n");
		return 1;
	}

	/* Fill in remaining MTD driver data */
	mtd->type = MTD_NANDFLASH;
	mtd->flags = MTD_CAP_NANDFLASH | MTD_ECC;
	mtd->module = NULL;
	mtd->ecctype = MTD_ECC_SW;
	mtd->erase = nand_erase;
	mtd->point = NULL;
	mtd->unpoint = NULL;
	mtd->read = nand_read;
	mtd->write = nand_write;
	mtd->read_ecc = nand_read_ecc;
	mtd->write_ecc = nand_write_ecc;
	mtd->read_oob = nand_read_oob;
	mtd->write_oob = nand_write_oob;
	mtd->lock = NULL;
	mtd->unlock = NULL;

	/* Return happy */
	return 0;
}