onenand_base.c

uboot200903最新版本的通用uboot

{
	struct onenand_chip *this = mtd->priv;
	int ret;

	ret = onenand_block_isbad(mtd, ofs);
	if (ret) {
		/* If it was bad already, return success and do nothing */
		if (ret > 0)
			return 0;
		return ret;
	}

	ret = this->block_markbad(mtd, ofs);
	return ret;
}

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

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

	if (cmd == ONENAND_CMD_LOCK)
		wp_status_mask = ONENAND_WP_LS;
	else
		wp_status_mask = ONENAND_WP_US;

	/* Continuous lock scheme */
	if (this->options & ONENAND_HAS_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, cmd, 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 < start + 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);
		/* 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 "block = %d, wp status = 0x%x\n",
			       block, status);
	}

	return 0;
}

#ifdef ONENAND_LINUX
/**
 * 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;
}
#endif

/**
 * 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;

		return;

		/* 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);
}


/**
 * 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 ID
 * @param device        device ID
 *
 * Print device ID
 */
char *onenand_print_device_info(int device, int version)
{
	int vcc, demuxed, ddp, density;
	char *dev_info = malloc(80);
	char *p = dev_info;

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

	sprintf(p, "\nOneNAND version = 0x%04x", version);
	printk("%s\n", dev_info);

	return dev_info;
}

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

/**
 * onenand_check_maf - Check manufacturer ID
 * @param manuf         manufacturer ID
 *
 * Check manufacturer ID
 */
static int onenand_check_maf(int manuf)
{
	int size = ARRAY_SIZE(onenand_manuf_ids);
	char *name;
	int i;

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

	if (i < size)
		name = onenand_manuf_ids[i].name;
	else
		name = "Unknown";

#ifdef ONENAND_DEBUG
	printk(KERN_DEBUG "OneNAND Manufacturer: %s (0x%0x)\n", name, manuf);
#endif

	return i == size;
}

/**
 * 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, ver_id;
	int density;
	int syscfg;

	/* Save system configuration 1 */
	syscfg = this->read_word(this->base + ONENAND_REG_SYS_CFG1);
	/* Clear Sync. Burst Read mode to read BootRAM */
	this->write_word((syscfg & ~ONENAND_SYS_CFG1_SYNC_READ), this->base + ONENAND_REG_SYS_CFG1);

	/* 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);

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

	/* Wait reset */
	this->wait(mtd, FL_RESETING);

	/* Restore system configuration 1 */
	this->write_word(syscfg, this->base + ONENAND_REG_SYS_CFG1);

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

	/* 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);
	ver_id = this->read_word(this->base + ONENAND_REG_VERSION_ID);

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

	/* FIXME : Current OneNAND MTD doesn't support Flex-OneNAND */
	if (dev_id & (1 << 9)) {
		printk("Not yet support Flex-OneNAND\n");
		return -ENXIO;
	}

	/* Flash device information */
	mtd->name = onenand_print_device_info(dev_id, ver_id);
	this->device_id = dev_id;
	this->version_id = ver_id;

	density = onenand_get_density(dev_id);
	this->chipsize = (16 << density) << 20;
	/* Set density mask. it is used for DDP */
	if (ONENAND_IS_DDP(this))
		this->density_mask = (1 << (density + 6));
	else
		this->density_mask = 0;

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

	this->erase_shift = ffs(mtd->erasesize) - 1;
	this->page_shift = ffs(mtd->writesize) - 1;
	this->ppb_shift = (this->erase_shift - this->page_shift);
	this->page_mask = (mtd->erasesize / mtd->writesize) - 1;
	/* It's real page size */
	this->writesize = mtd->writesize;

	/* REVIST: Multichip handling */

	mtd->size = this->chipsize;

	/* Check OneNAND features */
	onenand_check_features(mtd);

	mtd->flags = MTD_CAP_NANDFLASH;
	mtd->erase = onenand_erase;
	mtd->read = onenand_read;
	mtd->write = onenand_write;
	mtd->read_oob = onenand_read_oob;
	mtd->write_oob = onenand_write_oob;
	mtd->sync = onenand_sync;
	mtd->block_isbad = onenand_block_isbad;
	mtd->block_markbad = onenand_block_markbad;

	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)
{
	int i;
	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->bbt_wait)
		this->bbt_wait = onenand_bbt_wait;

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

	if (!this->block_markbad)
		this->block_markbad = onenand_default_block_markbad;
	if (!this->scan_bbt)
		this->scan_bbt = onenand_default_bbt;

	if (onenand_probe(mtd))
		return -ENXIO;

	/* Set Sync. Burst Read after probing */
	if (this->mmcontrol) {
		printk(KERN_INFO "OneNAND Sync. Burst Read support\n");
		this->read_bufferram = onenand_sync_read_bufferram;
	}

	/* Allocate buffers, if necessary */
	if (!this->page_buf) {
		this->page_buf = kzalloc(mtd->writesize, GFP_KERNEL);
		if (!this->page_buf) {
			printk(KERN_ERR "onenand_scan(): Can't allocate page_buf\n");
			return -ENOMEM;
		}
		this->options |= ONENAND_PAGEBUF_ALLOC;
	}
	if (!this->oob_buf) {
		this->oob_buf = kzalloc(mtd->oobsize, GFP_KERNEL);
		if (!this->oob_buf) {
			printk(KERN_ERR "onenand_scan: Can't allocate oob_buf\n");
			if (this->options & ONENAND_PAGEBUF_ALLOC) {
				this->options &= ~ONENAND_PAGEBUF_ALLOC;
				kfree(this->page_buf);
			}
			return -ENOMEM;
		}
		this->options |= ONENAND_OOBBUF_ALLOC;
	}

	this->state = FL_READY;

	/*
	 * Allow subpage writes up to oobsize.
	 */
	switch (mtd->oobsize) {
	case 64:
		this->ecclayout = &onenand_oob_64;
		mtd->subpage_sft = 2;
		break;

	case 32:
		this->ecclayout = &onenand_oob_32;
		mtd->subpage_sft = 1;
		break;

	default:
		printk(KERN_WARNING "No OOB scheme defined for oobsize %d\n",
			mtd->oobsize);
		mtd->subpage_sft = 0;
		/* To prevent kernel oops */
		this->ecclayout = &onenand_oob_32;
		break;
	}

	this->subpagesize = mtd->writesize >> mtd->subpage_sft;

	/*
	 * The number of bytes available for a client to place data into
	 * the out of band area
	 */
	this->ecclayout->oobavail = 0;
	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES &&
	    this->ecclayout->oobfree[i].length; i++)
		this->ecclayout->oobavail +=
			this->ecclayout->oobfree[i].length;
	mtd->oobavail = this->ecclayout->oobavail;

	mtd->ecclayout = this->ecclayout;

	/* Unlock whole block */
	onenand_unlock_all(mtd);

	return this->scan_bbt(mtd);
}

/**
 * onenand_release - [OneNAND Interface] Free resources held by the OneNAND device
 * @param mtd		MTD device structure
 */
void onenand_release(struct mtd_info *mtd)
{
}