onenand_base.c

基于linux-2.6.28的mtd驱动

		if (!(status & wp_status_mask))
			printk(KERN_ERR "block = %d, wp status = 0x%x\n", block, status);
	}

	return 0;
}

/**
 * onenand_lock - [MTD Interface] Lock block(s)
 * @param mtd		MTD device structure
 * @param ofs		offset relative to mtd start
 * @param len		number of bytes to unlock
 *
 * Lock one or more blocks
 */
static int onenand_lock(struct mtd_info *mtd, loff_t ofs, size_t len)
{
	int ret;

	onenand_get_device(mtd, FL_LOCKING);
	ret = onenand_do_lock_cmd(mtd, ofs, len, ONENAND_CMD_LOCK);
	onenand_release_device(mtd);
	return ret;
}

/**
 * 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)
{
	int ret;

	onenand_get_device(mtd, FL_LOCKING);
	ret = onenand_do_lock_cmd(mtd, ofs, len, ONENAND_CMD_UNLOCK);
	onenand_release_device(mtd);
	return ret;
}

/**
 * onenand_check_lock_status - [OneNAND Interface] Check lock status
 * @param this		onenand chip data structure
 *
 * Check lock status
 */
static int onenand_check_lock_status(struct onenand_chip *this)
{
	unsigned int value, block, status;
	unsigned int end;

	end = this->chipsize >> this->erase_shift;
	for (block = 0; block < end; block++) {
		/* Set block address */
		value = onenand_block_address(this, block);
		this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
		/* Select DataRAM for DDP */
		value = onenand_bufferram_address(this, block);
		this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
		/* Set start block address */
		this->write_word(block, this->base + ONENAND_REG_START_BLOCK_ADDRESS);

		/* 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;
		}
	}

	return 1;
}

/**
 * onenand_unlock_all - [OneNAND Interface] unlock all blocks
 * @param mtd		MTD device structure
 *
 * Unlock all blocks
 */
static void onenand_unlock_all(struct mtd_info *mtd)
{
	struct onenand_chip *this = mtd->priv;
	loff_t ofs = 0;
	size_t len = this->chipsize;

	if (this->options & ONENAND_HAS_UNLOCK_ALL) {
		/* Set start block address */
		this->write_word(0, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
		/* Write unlock command */
		this->command(mtd, ONENAND_CMD_UNLOCK_ALL, 0, 0);

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

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

		/* Check lock status */
		if (onenand_check_lock_status(this))
			return;

		/* Workaround for all block unlock in DDP */
		if (ONENAND_IS_DDP(this)) {
			/* All blocks on another chip */
			ofs = this->chipsize >> 1;
			len = this->chipsize >> 1;
		}
	}

	onenand_do_lock_cmd(mtd, ofs, len, ONENAND_CMD_UNLOCK);
}

#ifdef CONFIG_MTD_ONENAND_OTP

/* Interal OTP operation */
typedef int (*otp_op_t)(struct mtd_info *mtd, loff_t form, size_t len,
		size_t *retlen, u_char *buf);

/**
 * do_otp_read - [DEFAULT] Read OTP block area
 * @param mtd		MTD device structure
 * @param from		The offset to read
 * @param len		number of bytes to read
 * @param retlen	pointer to variable to store the number of readbytes
 * @param buf		the databuffer to put/get data
 *
 * Read OTP block area.
 */
static int do_otp_read(struct mtd_info *mtd, loff_t from, size_t len,
		size_t *retlen, u_char *buf)
{
	struct onenand_chip *this = mtd->priv;
	struct mtd_oob_ops ops = {
		.len	= len,
		.ooblen	= 0,
		.datbuf	= buf,
		.oobbuf	= NULL,
	};
	int ret;

	/* Enter OTP access mode */
	this->command(mtd, ONENAND_CMD_OTP_ACCESS, 0, 0);
	this->wait(mtd, FL_OTPING);

	ret = onenand_read_ops_nolock(mtd, from, &ops);

	/* Exit OTP access mode */
	this->command(mtd, ONENAND_CMD_RESET, 0, 0);
	this->wait(mtd, FL_RESETING);

	return ret;
}

/**
 * do_otp_write - [DEFAULT] Write OTP block area
 * @param mtd		MTD device structure
 * @param to		The offset to write
 * @param len		number of bytes to write
 * @param retlen	pointer to variable to store the number of write bytes
 * @param buf		the databuffer to put/get data
 *
 * Write OTP block area.
 */
static int do_otp_write(struct mtd_info *mtd, loff_t to, size_t len,
		size_t *retlen, u_char *buf)
{
	struct onenand_chip *this = mtd->priv;
	unsigned char *pbuf = buf;
	int ret;
	struct mtd_oob_ops ops;

	/* Force buffer page aligned */
	if (len < mtd->writesize) {
		memcpy(this->page_buf, buf, len);
		memset(this->page_buf + len, 0xff, mtd->writesize - len);
		pbuf = this->page_buf;
		len = mtd->writesize;
	}

	/* Enter OTP access mode */
	this->command(mtd, ONENAND_CMD_OTP_ACCESS, 0, 0);
	this->wait(mtd, FL_OTPING);

	ops.len = len;
	ops.ooblen = 0;
	ops.datbuf = pbuf;
	ops.oobbuf = NULL;
	ret = onenand_write_ops_nolock(mtd, to, &ops);
	*retlen = ops.retlen;

	/* Exit OTP access mode */
	this->command(mtd, ONENAND_CMD_RESET, 0, 0);
	this->wait(mtd, FL_RESETING);

	return ret;
}

/**
 * do_otp_lock - [DEFAULT] Lock OTP block area
 * @param mtd		MTD device structure
 * @param from		The offset to lock
 * @param len		number of bytes to lock
 * @param retlen	pointer to variable to store the number of lock bytes
 * @param buf		the databuffer to put/get data
 *
 * Lock OTP block area.
 */
static int do_otp_lock(struct mtd_info *mtd, loff_t from, size_t len,
		size_t *retlen, u_char *buf)
{
	struct onenand_chip *this = mtd->priv;
	struct mtd_oob_ops ops = {
		.mode = MTD_OOB_PLACE,
		.ooblen = len,
		.oobbuf = buf,
		.ooboffs = 0,
	};
	int ret;

	/* Enter OTP access mode */
	this->command(mtd, ONENAND_CMD_OTP_ACCESS, 0, 0);
	this->wait(mtd, FL_OTPING);

	ret = onenand_write_oob_nolock(mtd, from, &ops);

	*retlen = ops.oobretlen;

	/* Exit OTP access mode */
	this->command(mtd, ONENAND_CMD_RESET, 0, 0);
	this->wait(mtd, FL_RESETING);

	return ret;
}

/**
 * onenand_otp_walk - [DEFAULT] Handle OTP operation
 * @param mtd		MTD device structure
 * @param from		The offset to read/write
 * @param len		number of bytes to read/write
 * @param retlen	pointer to variable to store the number of read bytes
 * @param buf		the databuffer to put/get data
 * @param action	do given action
 * @param mode		specify user and factory
 *
 * Handle OTP operation.
 */
static int onenand_otp_walk(struct mtd_info *mtd, loff_t from, size_t len,
			size_t *retlen, u_char *buf,
			otp_op_t action, int mode)
{
	struct onenand_chip *this = mtd->priv;
	int otp_pages;
	int density;
	int ret = 0;

	*retlen = 0;

	density = onenand_get_density(this->device_id);
	if (density < ONENAND_DEVICE_DENSITY_512Mb)
		otp_pages = 20;
	else
		otp_pages = 10;

	if (mode == MTD_OTP_FACTORY) {
		from += mtd->writesize * otp_pages;
		otp_pages = 64 - otp_pages;
	}

	/* Check User/Factory boundary */
	if (((mtd->writesize * otp_pages) - (from + len)) < 0)
		return 0;

	onenand_get_device(mtd, FL_OTPING);
	while (len > 0 && otp_pages > 0) {
		if (!action) {	/* OTP Info functions */
			struct otp_info *otpinfo;

			len -= sizeof(struct otp_info);
			if (len <= 0) {
				ret = -ENOSPC;
				break;
			}

			otpinfo = (struct otp_info *) buf;
			otpinfo->start = from;
			otpinfo->length = mtd->writesize;
			otpinfo->locked = 0;

			from += mtd->writesize;
			buf += sizeof(struct otp_info);
			*retlen += sizeof(struct otp_info);
		} else {
			size_t tmp_retlen;
			int size = len;

			ret = action(mtd, from, len, &tmp_retlen, buf);

			buf += size;
			len -= size;
			*retlen += size;

			if (ret)
				break;
		}
		otp_pages--;
	}
	onenand_release_device(mtd);

	return ret;
}

/**
 * onenand_get_fact_prot_info - [MTD Interface] Read factory OTP info
 * @param mtd		MTD device structure
 * @param buf		the databuffer to put/get data
 * @param len		number of bytes to read
 *
 * Read factory OTP info.
 */
static int onenand_get_fact_prot_info(struct mtd_info *mtd,
			struct otp_info *buf, size_t len)
{
	size_t retlen;
	int ret;

	ret = onenand_otp_walk(mtd, 0, len, &retlen, (u_char *) buf, NULL, MTD_OTP_FACTORY);

	return ret ? : retlen;
}

/**
 * onenand_read_fact_prot_reg - [MTD Interface] Read factory OTP area
 * @param mtd		MTD device structure
 * @param from		The offset to read
 * @param len		number of bytes to read
 * @param retlen	pointer to variable to store the number of read bytes
 * @param buf		the databuffer to put/get data
 *
 * Read factory OTP area.
 */
static int onenand_read_fact_prot_reg(struct mtd_info *mtd, loff_t from,
			size_t len, size_t *retlen, u_char *buf)
{
	return onenand_otp_walk(mtd, from, len, retlen, buf, do_otp_read, MTD_OTP_FACTORY);
}

/**
 * onenand_get_user_prot_info - [MTD Interface] Read user OTP info
 * @param mtd		MTD device structure
 * @param buf		the databuffer to put/get data
 * @param len		number of bytes to read
 *
 * Read user OTP info.
 */
static int onenand_get_user_prot_info(struct mtd_info *mtd,
			struct otp_info *buf, size_t len)
{
	size_t retlen;
	int ret;

	ret = onenand_otp_walk(mtd, 0, len, &retlen, (u_char *) buf, NULL, MTD_OTP_USER);

	return ret ? : retlen;
}

/**
 * onenand_read_user_prot_reg - [MTD Interface] Read user OTP area
 * @param mtd		MTD device structure
 * @param from		The offset to read
 * @param len		number of bytes to read
 * @param retlen	pointer to variable to store the number of read bytes
 * @param buf		the databuffer to put/get data
 *
 * Read user OTP area.
 */
static int onenand_read_user_prot_reg(struct mtd_info *mtd, loff_t from,
			size_t len, size_t *retlen, u_char *buf)
{
	return onenand_otp_walk(mtd, from, len, retlen, buf, do_otp_read, MTD_OTP_USER);
}

/**
 * onenand_write_user_prot_reg - [MTD Interface] Write user OTP area
 * @param mtd		MTD device structure
 * @param from		The offset to write
 * @param len		number of bytes to write
 * @param retlen	pointer to variable to store the number of write bytes
 * @param buf		the databuffer to put/get data
 *
 * Write user OTP area.
 */
static int onenand_write_user_prot_reg(struct mtd_info *mtd, loff_t from,
			size_t len, size_t *retlen, u_char *buf)
{
	return onenand_otp_walk(mtd, from, len, retlen, buf, do_otp_write, MTD_OTP_USER);
}

/**
 * onenand_lock_user_prot_reg - [MTD Interface] Lock user OTP area
 * @param mtd		MTD device structure
 * @param from		The offset to lock
 * @param len		number of bytes to unlock
 *
 * Write lock mark on spare area in page 0 in OTP block
 */
static int onenand_lock_user_prot_reg(struct mtd_info *mtd, loff_t from,
			size_t len)
{
	struct onenand_chip *this = mtd->priv;
	u_char *oob_buf = this->oob_buf;
	size_t retlen;
	int ret;

	memset(oob_buf, 0xff, mtd->oobsize);
	/*
	 * Note: OTP lock operation
	 *       OTP block : 0xXXFC
	 *       1st block : 0xXXF3 (If chip support)
	 *       Both      : 0xXXF0 (If chip support)
	 */
	oob_buf[ONENAND_OTP_LOCK_OFFSET] = 0xFC;

	/*
	 * Write lock mark to 8th word of sector0 of page0 of the spare0.
	 * We write 16 bytes spare area instead of 2 bytes.
	 */
	from = 0;
	len = 16;

	ret = onenand_otp_walk(mtd, from, len, &retlen, oob_buf, do_otp_lock, MTD_OTP_USER);

	return ret ? : retlen;
}
#endif	/* CONFIG_MTD_ONENAND_OTP */

/**
 * onenand_check_features - Check and set OneNAND features
 * @param mtd		MTD data structure
 *
 * Check and set OneNAND features
 * - lock scheme
 * - two plane
 */
static void onenand_check_features(struct mtd_info *mtd)
{
	struct onenand_chip *this = mtd->priv;
	unsigned int density, process;

	/* Lock scheme depends on density and process */
	density = onenand_get_density(this->device_id);
	process = this->version_id >> ONENAND_VERSION_PROCESS_SHIFT;

	/* Lock scheme */
	switch (density) {
	case ONENAND_DEVICE_DENSITY_4Gb:
		this->options |= ONENAND_HAS_2PLANE;

	case ONENAND_DEVICE_DENSITY_2Gb:
		/* 2Gb DDP don't have 2 plane */
		if (!ONENAND_IS_DDP(this))
			this->options |= ONENAND_HAS_2PLANE;
		this->options |= ONENAND_HAS_UNLOCK_ALL;

	case ONENAND_DEVICE_DENSITY_1Gb:
		/* A-Die has all block unlock */
		if (process)
			this->options |= ONENAND_HAS_UNLOCK_ALL;
		break;

	default:
		/* Some OneNAND has continuous lock scheme */
		if (!process)
			this->options |= ONENAND_HAS_CONT_LOCK;
		break;
	}

	if (this->options & ONENAND_HAS_CONT_LOCK)
		printk(KERN_DEBUG "Lock scheme is Continuous Lock\n");
	if (this->options & ONENAND_HAS_UNLOCK_ALL)
		printk(KERN_DEBUG "Chip support all block unlock\n");
	if (this->options & ONENAND_HAS_2PLANE)
		printk(KERN_DEBUG "Chip has 2 plane\n");
}

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

        vcc = device & ONENAND_DE