onenand_base.c

老版本的mtd-snap

			}
		}

		this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->oobblock);

		this->write_bufferram(mtd, ONENAND_DATARAM, pbuf, 0, mtd->oobblock);
		this->write_bufferram(mtd, ONENAND_SPARERAM, ffchars, 0, mtd->oobsize);

		this->command(mtd, ONENAND_CMD_PROG, to, mtd->oobblock);

		onenand_update_bufferram(mtd, to, 1);

		ret = this->wait(mtd, FL_WRITING);
		if (ret) {
			DEBUG(MTD_DEBUG_LEVEL0, "onenand_writev_ecc: write failed %d\n", ret);
			goto out;
		}


		/* Only check verify write turn on */
		ret = onenand_verify_page(mtd, (u_char *) pbuf, to, block, page);
		if (ret) {
			DEBUG(MTD_DEBUG_LEVEL0, "onenand_writev_ecc: verify failed %d\n", ret);
			goto out;
		}

		written += mtd->oobblock;

		to += mtd->oobblock;
	}

out:
	/* Deselect and wakt up anyone waiting on the device */
	onenand_release_device(mtd);

	*retlen = written;

	return 0;
}

/**
 * onenand_writev - [MTD Interface] compabilty function for onenand_writev_ecc
 * @param mtd		MTD device structure
 * @param vecs		the iovectors to write
 * @param count		number of vectors
 * @param to		offset to write to
 * @param retlen	pointer to variable to store the number of written bytes
 *
 * OneNAND write with kvec. This just calls the ecc function
 */
static int onenand_writev(struct mtd_info *mtd, const struct kvec *vecs,
	unsigned long count, loff_t to, size_t *retlen)
{
	return onenand_writev_ecc(mtd, vecs, count, to, retlen, NULL, NULL);
}

/**
 * onenand_erase - [MTD Interface] erase block(s)
 * @param mtd		MTD device structure
 * @param instr		erase instruction
 *
 * Erase one ore more blocks
 */
static int onenand_erase(struct mtd_info *mtd, struct erase_info *instr)
{
	struct onenand_chip *this = mtd->priv;
	unsigned int block_size;
	loff_t addr;
	int len;
	int ret = 0;

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

	block_size = (1 << this->erase_shift);

	/* Start address must align on block boundary */
	if (unlikely(instr->addr & (block_size - 1))) {
		DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Unaligned address\n");
		return -EINVAL;
	}

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

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

	instr->fail_addr = 0xffffffff;

	/* Grab the lock and see if the device is available */
	onenand_get_device(mtd, FL_ERASING);

	/* Loop throught the pages */
	len = instr->len;
	addr = instr->addr;

	instr->state = MTD_ERASING;

	while (len) {

		/* TODO Check badblock */

		this->command(mtd, ONENAND_CMD_ERASE, addr, block_size);

		ret = this->wait(mtd, FL_ERASING);
		/* Check, if it is write protected */
		if (ret) {
			if (ret == -EPERM)
				DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Device is write protected!!!\n");
			else
				DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Failed erase, block %d\n", (unsigned) (addr >> this->erase_shift));
			instr->state = MTD_ERASE_FAILED;
			instr->fail_addr = addr;
			goto erase_exit;
		}

		len -= block_size;
		addr += block_size;
	}

	instr->state = MTD_ERASE_DONE;

erase_exit:

	ret = instr->state == MTD_ERASE_DONE ? 0 : -EIO;
	/* Do call back function */
	if (!ret)
		mtd_erase_callback(instr);

	/* Deselect and wake up anyone waiting on the device */
	onenand_release_device(mtd);

	return ret;
}

/**
 * onenand_sync - [MTD Interface] sync
 * @param mtd		MTD device structure
 *
 * Sync is actually a wait for chip ready function
 */
static void onenand_sync(struct mtd_info *mtd)
{
	DEBUG(MTD_DEBUG_LEVEL3, "onenand_sync: called\n");

	/* Grab the lock and see if the device is available */
	onenand_get_device(mtd, FL_SYNCING);

	/* Release it and go back */
	onenand_release_device(mtd);
}

/**
 * onenand_block_isbad - [MTD Interface] Check whether the block at the given offset is bad
 * @param mtd		MTD device structure
 * @param ofs		offset relative to mtd start
 */
static int onenand_block_isbad(struct mtd_info *mtd, loff_t ofs)
{
	/*
	 * TODO 
	 * 1. Bad block table (BBT)
	 *   -> using NAND BBT to support JFFS2
	 * 2. Bad block management (BBM)
	 *   -> bad block replace scheme
	 *
	 * Currently we do nothing
	 */
	return 0;
}

/**
 * onenand_block_markbad - [MTD Interface] Mark the block at the given offset as bad
 * @param mtd		MTD device structure
 * @param ofs		offset relative to mtd start
 */
static int onenand_block_markbad(struct mtd_info *mtd, loff_t ofs)
{
	/* see above */
	return 0;
}

/**
 * onenand_unlock - [MTD Interface] Unlock block(s)
 * @param mtd		MTD device structure
 * @param ofs		offset relative to mtd start
 * @param len		number of bytes to unlock
 *
 * Unlock one or more blocks
 */
static int onenand_unlock(struct mtd_info *mtd, loff_t ofs, size_t len)
{
	struct onenand_chip *this = mtd->priv;
	int start, end, block, value, status;

	start = ofs >> this->erase_shift;
	end = len >> this->erase_shift;

	/* Continuous lock scheme */
	if (this->options & ONENAND_CONT_LOCK) {
		/* Set start block address */
		this->write_word(start, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
		/* Set end block address */
		this->write_word(end - 1, this->base + ONENAND_REG_END_BLOCK_ADDRESS);
		/* Write unlock command */
		this->command(mtd, ONENAND_CMD_UNLOCK, 0, 0);

		/* There's no return value */
		this->wait(mtd, FL_UNLOCKING);

		/* Sanity check */
		while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
		    & ONENAND_CTRL_ONGO)
			continue;

		/* Check lock status */
		status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
		if (!(status & ONENAND_WP_US))
			printk(KERN_ERR "wp status = 0x%x\n", status);

		return 0;
	}

	/* Block lock scheme */
	for (block = start; block < end; block++) {
		/* Set start block address */
		this->write_word(block, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
		/* Write unlock command */
		this->command(mtd, ONENAND_CMD_UNLOCK, 0, 0);

		/* There's no return value */
		this->wait(mtd, FL_UNLOCKING);

		/* Sanity check */
		while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
		    & ONENAND_CTRL_ONGO)
			continue;

		/* Set block address for read block status */
		value = onenand_block_address(this->device_id, block);
		this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);

		/* Check lock status */
		status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
		if (!(status & ONENAND_WP_US))
			printk(KERN_ERR "block = %d, wp status = 0x%x\n", block, status);
	}
	
	return 0;
}

/**
 * onenand_print_device_info - Print device ID
 * @param device        device ID
 *
 * Print device ID
 */
static void onenand_print_device_info(int device)
{
        int vcc, demuxed, ddp, density;

        vcc = device & ONENAND_DEVICE_VCC_MASK;
        demuxed = device & ONENAND_DEVICE_IS_DEMUX;
        ddp = device & ONENAND_DEVICE_IS_DDP;
        density = device >> ONENAND_DEVICE_DENSITY_SHIFT;
        printk(KERN_INFO "%sOneNAND%s %dMB %sV 16-bit (0x%02x)\n",
                demuxed ? "" : "Muxed ",
                ddp ? "(DDP)" : "",
                (16 << density),
                vcc ? "2.65/3.3" : "1.8",
                device);
}

static const struct onenand_manufacturers onenand_manuf_ids[] = {
        {ONENAND_MFR_SAMSUNG, "Samsung"},
        {ONENAND_MFR_UNKNOWN, "Unknown"}
};

/**
 * onenand_check_maf - Check manufacturer ID
 * @param manuf         manufacturer ID
 *
 * Check manufacturer ID
 */
static int onenand_check_maf(int manuf)
{
        int i;

        for (i = 0; onenand_manuf_ids[i].id; i++) {
                if (manuf == onenand_manuf_ids[i].id)
                        break;
        }

        printk(KERN_DEBUG "OneNAND Manufacturer: %s\n",
                onenand_manuf_ids[i].name);

        return (i != ONENAND_MFR_UNKNOWN);
}

/**
 * onenand_probe - [OneNAND Interface] Probe the OneNAND device
 * @param mtd		MTD device structure
 *
 * OneNAND detection method:
 *   Compare the the values from command with ones from register
 */
static int onenand_probe(struct mtd_info *mtd)
{
	struct onenand_chip *this = mtd->priv;
	int bram_maf_id, bram_dev_id, maf_id, dev_id;
	int version_id;
	int density;

	/* Send the command for reading device ID from BootRAM */
	this->write_word(ONENAND_CMD_READID, this->base + ONENAND_BOOTRAM);

	/* Read manufacturer and device IDs from BootRAM */
	bram_maf_id = this->read_word(this->base + ONENAND_BOOTRAM + 0x0);
	bram_dev_id = this->read_word(this->base + ONENAND_BOOTRAM + 0x2);

	/* Check manufacturer ID */
	if (onenand_check_maf(bram_maf_id))
		return -ENXIO;

	/* Reset OneNAND to read default register values */
	this->write_word(ONENAND_CMD_RESET, this->base + ONENAND_BOOTRAM);

	/* Read manufacturer and device IDs from Register */
	maf_id = this->read_word(this->base + ONENAND_REG_MANUFACTURER_ID);
	dev_id = this->read_word(this->base + ONENAND_REG_DEVICE_ID);

	/* Check OneNAND device */
	if (maf_id != bram_maf_id || dev_id != bram_dev_id)
		return -ENXIO;

	/* Flash device information */
	onenand_print_device_info(dev_id);
	this->device_id = dev_id;

	density = dev_id >> ONENAND_DEVICE_DENSITY_SHIFT;
	this->chipsize = (16 << density) << 20;

	/* OneNAND page size & block size */
	/* The data buffer size is equal to page size */
	mtd->oobblock = this->read_word(this->base + ONENAND_REG_DATA_BUFFER_SIZE);
	mtd->oobsize = mtd->oobblock >> 5;
	/* Pagers per block is always 64 in OneNAND */
	mtd->erasesize = mtd->oobblock << 6;

	this->erase_shift = ffs(mtd->erasesize) - 1;
	this->page_shift = ffs(mtd->oobblock) - 1;
	this->ppb_shift = (this->erase_shift - this->page_shift);
	this->page_mask = (mtd->erasesize / mtd->oobblock) - 1;

	/* REVIST: Multichip handling */

	mtd->size = this->chipsize;

	/* Version ID */
	version_id = this->read_word(this->base + ONENAND_REG_VERSION_ID);
	printk(KERN_DEBUG "OneNAND version = 0x%04x\n", version_id);

	/* Lock scheme */
	if (density <= ONENAND_DEVICE_DENSITY_512Mb &&
	    !(version_id >> ONENAND_VERSION_PROCESS_SHIFT)) {
		printk(KERN_INFO "Lock scheme is Continues Lock\n");
		this->options |= ONENAND_CONT_LOCK;
	}
	
	return 0;
}


/**
 * onenand_scan - [OneNAND Interface] Scan for the OneNAND device
 * @param mtd		MTD device structure
 * @param maxchips	Number of chips to scan for
 *
 * This fills out all the not initialized function pointers
 * with the defaults.
 * The flash ID is read and the mtd/chip structures are
 * filled with the appropriate values.
 */
int onenand_scan(struct mtd_info *mtd, int maxchips)
{
	struct onenand_chip *this = mtd->priv;

	if (!this->read_word)
		this->read_word = onenand_readw;
	if (!this->write_word)
		this->write_word = onenand_writew;

	if (!this->command)
		this->command = onenand_command;
	if (!this->wait)
		this->wait = onenand_wait;

	if (!this->read_bufferram)
		this->read_bufferram = onenand_read_bufferram;
	if (!this->write_bufferram)
		this->write_bufferram = onenand_write_bufferram;

	if (onenand_probe(mtd))
		return -ENXIO;

	this->state = FL_READY;
	init_waitqueue_head(&this->wq);
	spin_lock_init(&this->chip_lock);

	switch (mtd->oobsize) {
	case 64:
		this->autooob = &onenand_oob_64;
		break;

	case 32:
		this->autooob = &onenand_oob_32;
		break;

	default:
		printk(KERN_WARNING "No OOB scheme defined for oobsize %d\n",
			mtd->oobsize);
		/* To prevent kernel oops */
		this->autooob = &onenand_oob_32;
		break;
	}

	memcpy(&mtd->oobinfo, this->autooob, sizeof(mtd->oobinfo));
	
	/* Fill in remaining MTD driver data */
	mtd->type = MTD_NANDFLASH;
	mtd->flags = MTD_CAP_NANDFLASH | MTD_ECC;
	mtd->ecctype = MTD_ECC_SW;
	mtd->erase = onenand_erase;
	mtd->point = NULL;
	mtd->unpoint = NULL;
	mtd->read = onenand_read;
	mtd->write = onenand_write;
	mtd->read_ecc = onenand_read_ecc;
	mtd->write_ecc = onenand_write_ecc;
	mtd->read_oob = onenand_read_oob;
	mtd->write_oob = onenand_write_oob;
	mtd->readv = NULL;
	mtd->readv_ecc = NULL;
	mtd->writev = onenand_writev;
	mtd->writev_ecc = onenand_writev_ecc;
	mtd->sync = onenand_sync;
	mtd->lock = NULL;
	mtd->unlock = onenand_unlock;
	mtd->suspend = NULL;
	mtd->resume = NULL;
	mtd->block_isbad = onenand_block_isbad;
	mtd->block_markbad = onenand_block_markbad;
	mtd->owner = THIS_MODULE;

	/* Unlock whole block */
	mtd->unlock(mtd, 0x0, this->chipsize);

	return 0;
}

/**
 * onenand_release - [OneNAND Interface] Free resources held by the OneNAND device
 * @param mtd		MTD device structure
 */
void onenand_release(struct mtd_info *mtd)
{
#ifdef CONFIG_MTD_PARTITIONS
	/* Deregister partitions */
	del_mtd_partitions (mtd);
#endif
	/* Deregister the device */
	del_mtd_device (mtd);
}

EXPORT_SYMBOL_GPL(onenand_scan);
EXPORT_SYMBOL_GPL(onenand_release);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Kyungmin Park <[e-mail]>");
MODULE_DESCRIPTION("Generic OneNAND flash driver code");