mtdpart.c

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	part->master->resume(part->master);
}

/* 
 * This function unregisters and destroy all slave MTD objects which are 
 * attached to the given master MTD object.
 */

int del_mtd_partitions(struct mtd_info *master)
{
	struct list_head *node;
	struct mtd_part *slave;

	for (node = mtd_partitions.next;
	     node != &mtd_partitions;
	     node = node->next) {
		slave = list_entry(node, struct mtd_part, list);
		if (slave->master == master) {
			struct list_head *prev = node->prev;
			__list_del(prev, node->next);
			if(slave->registered)
				del_mtd_device(&slave->mtd);
			kfree(slave);
			node = prev;
		}
	}

	return 0;
}

/*
 * This function, given a master MTD object and a partition table, creates
 * and registers slave MTD objects which are bound to the master according to
 * the partition definitions.
 * (Q: should we register the master MTD object as well?)
 */

int add_mtd_partitions(struct mtd_info *master, 
		       const struct mtd_partition *parts,
		       int nbparts)
{
	struct mtd_part *slave;
	u_int32_t cur_offset = 0;
	int i;

	printk (KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);

	for (i = 0; i < nbparts; i++) {

		/* allocate the partition structure */
		slave = kmalloc (sizeof(*slave), GFP_KERNEL);
		if (!slave) {
			printk ("memory allocation error while creating partitions for \"%s\"\n",
				master->name);
			del_mtd_partitions(master);
			return -ENOMEM;
		}
		memset(slave, 0, sizeof(*slave));
		list_add(&slave->list, &mtd_partitions);

		/* set up the MTD object for this partition */
		slave->mtd.type = master->type;
		slave->mtd.flags = master->flags & ~parts[i].mask_flags;
		slave->mtd.size = parts[i].size;
		slave->mtd.oobblock = master->oobblock;
		slave->mtd.oobsize = master->oobsize;
		slave->mtd.ecctype = master->ecctype;
		slave->mtd.eccsize = master->eccsize;

		slave->mtd.name = parts[i].name;
		slave->mtd.bank_size = master->bank_size;
		slave->mtd.owner = master->owner;

		slave->mtd.read = part_read;
		slave->mtd.write = part_write;

		if(master->point && master->unpoint){
			slave->mtd.point = part_point;
			slave->mtd.unpoint = part_unpoint;
		}
		
		if (master->read_ecc)
			slave->mtd.read_ecc = part_read_ecc;
		if (master->write_ecc)
			slave->mtd.write_ecc = part_write_ecc;
		if (master->read_oob)
			slave->mtd.read_oob = part_read_oob;
		if (master->write_oob)
			slave->mtd.write_oob = part_write_oob;
		if(master->read_user_prot_reg)
			slave->mtd.read_user_prot_reg = part_read_user_prot_reg;
		if(master->read_fact_prot_reg)
			slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg;
		if(master->write_user_prot_reg)
			slave->mtd.write_user_prot_reg = part_write_user_prot_reg;
		if (master->sync)
			slave->mtd.sync = part_sync;
		if (!i && master->suspend && master->resume) {
				slave->mtd.suspend = part_suspend;
				slave->mtd.resume = part_resume;
		}
		if (master->writev)
			slave->mtd.writev = part_writev;
		if (master->readv)
			slave->mtd.readv = part_readv;
		if (master->writev_ecc)
			slave->mtd.writev_ecc = part_writev_ecc;
		if (master->readv_ecc)
			slave->mtd.readv_ecc = part_readv_ecc;
		if (master->lock)
			slave->mtd.lock = part_lock;
		if (master->unlock)
			slave->mtd.unlock = part_unlock;
		slave->mtd.erase = part_erase;
		slave->master = master;
		slave->offset = parts[i].offset;
		slave->index = i;

		if (parts[i].oobsel) // BUSHI
			memcpy(&slave->mtd.oobinfo, parts[i].oobsel, sizeof(struct nand_oobinfo));

		if (slave->offset == MTDPART_OFS_APPEND)
			slave->offset = cur_offset;
		if (slave->offset == MTDPART_OFS_NXTBLK) {
			u_int32_t emask = master->erasesize-1;
			slave->offset = (cur_offset + emask) & ~emask;
			if (slave->offset != cur_offset) {
				printk(KERN_NOTICE "Moving partition %d: "
				       "0x%08x -> 0x%08x\n", i,
				       cur_offset, slave->offset);
			}
		}
		if (slave->mtd.size == MTDPART_SIZ_FULL)
			slave->mtd.size = master->size - slave->offset;
		cur_offset = slave->offset + slave->mtd.size;
	
		printk (KERN_NOTICE "0x%08x-0x%08x : \"%s\"\n", slave->offset, 
			slave->offset + slave->mtd.size, slave->mtd.name);

		/* let's do some sanity checks */
		if (slave->offset >= master->size) {
				/* let's register it anyway to preserve ordering */
			slave->offset = 0;
			slave->mtd.size = 0;
			printk ("mtd: partition \"%s\" is out of reach -- disabled\n",
				parts[i].name);
		}
		if (slave->offset + slave->mtd.size > master->size) {
			slave->mtd.size = master->size - slave->offset;
			printk ("mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#x\n",
				parts[i].name, master->name, slave->mtd.size);
		}
		if (master->numeraseregions>1) {
			/* Deal with variable erase size stuff */
			int i;
			struct mtd_erase_region_info *regions = master->eraseregions;
			
			/* Find the first erase regions which is part of this partition. */
			for (i=0; i < master->numeraseregions && slave->offset >= regions[i].offset; i++)
				;

			for (i--; i < master->numeraseregions && slave->offset + slave->mtd.size > regions[i].offset; i++) {
				if (slave->mtd.erasesize < regions[i].erasesize) {
					slave->mtd.erasesize = regions[i].erasesize;
				}
			}
		} else {
			/* Single erase size */
			slave->mtd.erasesize = master->erasesize;
		}

		if ((slave->mtd.flags & MTD_WRITEABLE) && 
		    (slave->offset % slave->mtd.erasesize)) {
			/* Doesn't start on a boundary of major erase size */
			/* FIXME: Let it be writable if it is on a boundary of _minor_ erase size though */
			slave->mtd.flags &= ~MTD_WRITEABLE;
			printk ("mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
				parts[i].name);
		}
		if ((slave->mtd.flags & MTD_WRITEABLE) && 
		    (slave->mtd.size % slave->mtd.erasesize)) {
			slave->mtd.flags &= ~MTD_WRITEABLE;
			printk ("mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
				parts[i].name);
		}

		if(parts[i].mtdp)
		{	/* store the object pointer (caller may or may not register it */
			*parts[i].mtdp = &slave->mtd;
			slave->registered = 0;
		}
		else
		{
			/* register our partition */
			add_mtd_device(&slave->mtd);
			slave->registered = 1;
		}
	}

	return 0;
}

EXPORT_SYMBOL(add_mtd_partitions);
EXPORT_SYMBOL(del_mtd_partitions);

static spinlock_t part_parser_lock = SPIN_LOCK_UNLOCKED;
static LIST_HEAD(part_parsers);

struct mtd_part_parser *get_partition_parser(const char *name)
{
	struct list_head *this;
	void *ret = NULL;
	spin_lock(&part_parser_lock);

	list_for_each(this, &part_parsers) {
		struct mtd_part_parser *p = list_entry(this, struct mtd_part_parser, list);

		if (!strcmp(p->name, name) && try_module_get(p->owner)) {
			ret = p;
			break;
		}
	}
	spin_unlock(&part_parser_lock);

	return ret;
}

int register_mtd_parser(struct mtd_part_parser *p)
{
	spin_lock(&part_parser_lock);
	list_add(&p->list, &part_parsers);
	spin_unlock(&part_parser_lock);

	return 0;
}

int deregister_mtd_parser(struct mtd_part_parser *p)
{
	spin_lock(&part_parser_lock);
	list_del(&p->list);
	spin_unlock(&part_parser_lock);
	return 0;
}

int parse_mtd_partitions(struct mtd_info *master, const char **types, 
			 struct mtd_partition **pparts, unsigned long origin)
{
	struct mtd_part_parser *parser;
	int ret = 0;
		
	for ( ; ret <= 0 && *types; types++) {
		parser = get_partition_parser(*types);
#ifdef CONFIG_KMOD
		if (!parser && !request_module("%s", *types))
				parser = get_partition_parser(*types);
#endif
		if (!parser) {
			printk(KERN_NOTICE "%s partition parsing not available\n",
			       *types);
			continue;
		}
		ret = (*parser->parse_fn)(master, pparts, origin);
		if (ret > 0) {
			printk(KERN_NOTICE "%d %s partitions found on MTD device %s\n", 
			       ret, parser->name, master->name);
		}
		put_partition_parser(parser);
	}
	return ret;
}

EXPORT_SYMBOL_GPL(parse_mtd_partitions);
EXPORT_SYMBOL_GPL(register_mtd_parser);
EXPORT_SYMBOL_GPL(deregister_mtd_parser);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Nicolas Pitre <[e-mail]>");
MODULE_DESCRIPTION("Generic support for partitioning of MTD devices");