Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 599 insertions, 0 deletions

diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
new file mode 100644
index 000000000000..96ebb52f24b1
--- /dev/null
+++ b/drivers/mtd/mtdpart.c
@@ -0,0 +1,599 @@
+/*
+ * Simple MTD partitioning layer
+ *
+ * (C) 2000 Nicolas Pitre <nico@cam.org>
+ *
+ * This code is GPL
+ *
+ * $Id: mtdpart.c,v 1.51 2004/11/16 18:28:59 dwmw2 Exp $
+ *
+ * 	02-21-2002	Thomas Gleixner <gleixner@autronix.de>
+ *			added support for read_oob, write_oob
+ */	
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/list.h>
+#include <linux/config.h>
+#include <linux/kmod.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+#include <linux/mtd/compatmac.h>
+
+/* Our partition linked list */
+static LIST_HEAD(mtd_partitions);
+
+/* Our partition node structure */
+struct mtd_part {
+	struct mtd_info mtd;
+	struct mtd_info *master;
+	u_int32_t offset;
+	int index;
+	struct list_head list;
+	int registered;
+};
+
+/*
+ * Given a pointer to the MTD object in the mtd_part structure, we can retrieve
+ * the pointer to that structure with this macro.
+ */
+#define PART(x)  ((struct mtd_part *)(x))
+
+	
+/* 
+ * MTD methods which simply translate the effective address and pass through
+ * to the _real_ device.
+ */
+
+static int part_read (struct mtd_info *mtd, loff_t from, size_t len, 
+			size_t *retlen, u_char *buf)
+{
+	struct mtd_part *part = PART(mtd);
+	if (from >= mtd->size)
+		len = 0;
+	else if (from + len > mtd->size)
+		len = mtd->size - from;
+	if (part->master->read_ecc == NULL)	
+		return part->master->read (part->master, from + part->offset, 
+					len, retlen, buf);
+	else
+		return part->master->read_ecc (part->master, from + part->offset, 
+					len, retlen, buf, NULL, &mtd->oobinfo);
+}
+
+static int part_point (struct mtd_info *mtd, loff_t from, size_t len, 
+			size_t *retlen, u_char **buf)
+{
+	struct mtd_part *part = PART(mtd);
+	if (from >= mtd->size)
+		len = 0;
+	else if (from + len > mtd->size)
+		len = mtd->size - from;
+	return part->master->point (part->master, from + part->offset, 
+				    len, retlen, buf);
+}
+static void part_unpoint (struct mtd_info *mtd, u_char *addr, loff_t from, size_t len)
+{
+	struct mtd_part *part = PART(mtd);
+
+	part->master->unpoint (part->master, addr, from + part->offset, len);
+}
+
+
+static int part_read_ecc (struct mtd_info *mtd, loff_t from, size_t len, 
+			size_t *retlen, u_char *buf, u_char *eccbuf, struct nand_oobinfo *oobsel)
+{
+	struct mtd_part *part = PART(mtd);
+	if (oobsel == NULL)
+		oobsel = &mtd->oobinfo;
+	if (from >= mtd->size)
+		len = 0;
+	else if (from + len > mtd->size)
+		len = mtd->size - from;
+	return part->master->read_ecc (part->master, from + part->offset, 
+					len, retlen, buf, eccbuf, oobsel);
+}
+
+static int part_read_oob (struct mtd_info *mtd, loff_t from, size_t len, 
+			size_t *retlen, u_char *buf)
+{
+	struct mtd_part *part = PART(mtd);
+	if (from >= mtd->size)
+		len = 0;
+	else if (from + len > mtd->size)
+		len = mtd->size - from;
+	return part->master->read_oob (part->master, from + part->offset, 
+					len, retlen, buf);
+}
+
+static int part_read_user_prot_reg (struct mtd_info *mtd, loff_t from, size_t len, 
+			size_t *retlen, u_char *buf)
+{
+	struct mtd_part *part = PART(mtd);
+	return part->master->read_user_prot_reg (part->master, from, 
+					len, retlen, buf);
+}
+
+static int part_read_fact_prot_reg (struct mtd_info *mtd, loff_t from, size_t len, 
+			size_t *retlen, u_char *buf)
+{
+	struct mtd_part *part = PART(mtd);
+	return part->master->read_fact_prot_reg (part->master, from, 
+					len, retlen, buf);
+}
+
+static int part_write (struct mtd_info *mtd, loff_t to, size_t len,
+			size_t *retlen, const u_char *buf)
+{
+	struct mtd_part *part = PART(mtd);
+	if (!(mtd->flags & MTD_WRITEABLE))
+		return -EROFS;
+	if (to >= mtd->size)
+		len = 0;
+	else if (to + len > mtd->size)
+		len = mtd->size - to;
+	if (part->master->write_ecc == NULL)	
+		return part->master->write (part->master, to + part->offset, 
+					len, retlen, buf);
+	else
+		return part->master->write_ecc (part->master, to + part->offset, 
+					len, retlen, buf, NULL, &mtd->oobinfo);
+							
+}
+
+static int part_write_ecc (struct mtd_info *mtd, loff_t to, size_t len,
+			size_t *retlen, const u_char *buf,
+			 u_char *eccbuf, struct nand_oobinfo *oobsel)
+{
+	struct mtd_part *part = PART(mtd);
+	if (!(mtd->flags & MTD_WRITEABLE))
+		return -EROFS;
+	if (oobsel == NULL)
+		oobsel = &mtd->oobinfo;
+	if (to >= mtd->size)
+		len = 0;
+	else if (to + len > mtd->size)
+		len = mtd->size - to;
+	return part->master->write_ecc (part->master, to + part->offset, 
+					len, retlen, buf, eccbuf, oobsel);
+}
+
+static int part_write_oob (struct mtd_info *mtd, loff_t to, size_t len,
+			size_t *retlen, const u_char *buf)
+{
+	struct mtd_part *part = PART(mtd);
+	if (!(mtd->flags & MTD_WRITEABLE))
+		return -EROFS;
+	if (to >= mtd->size)
+		len = 0;
+	else if (to + len > mtd->size)
+		len = mtd->size - to;
+	return part->master->write_oob (part->master, to + part->offset, 
+					len, retlen, buf);
+}
+
+static int part_write_user_prot_reg (struct mtd_info *mtd, loff_t from, size_t len, 
+			size_t *retlen, u_char *buf)
+{
+	struct mtd_part *part = PART(mtd);
+	return part->master->write_user_prot_reg (part->master, from, 
+					len, retlen, buf);
+}
+
+static int part_writev (struct mtd_info *mtd,  const struct kvec *vecs,
+			 unsigned long count, loff_t to, size_t *retlen)
+{
+	struct mtd_part *part = PART(mtd);
+	if (!(mtd->flags & MTD_WRITEABLE))
+		return -EROFS;
+	if (part->master->writev_ecc == NULL)	
+		return part->master->writev (part->master, vecs, count,
+					to + part->offset, retlen);
+	else
+		return part->master->writev_ecc (part->master, vecs, count,
+					to + part->offset, retlen,
+					NULL, &mtd->oobinfo);
+}
+
+static int part_readv (struct mtd_info *mtd,  struct kvec *vecs,
+			 unsigned long count, loff_t from, size_t *retlen)
+{
+	struct mtd_part *part = PART(mtd);
+	if (part->master->readv_ecc == NULL)	
+		return part->master->readv (part->master, vecs, count,
+					from + part->offset, retlen);
+	else
+		return part->master->readv_ecc (part->master, vecs, count,
+					from + part->offset, retlen, 
+					NULL, &mtd->oobinfo);
+}
+
+static int part_writev_ecc (struct mtd_info *mtd,  const struct kvec *vecs,
+			 unsigned long count, loff_t to, size_t *retlen,
+			 u_char *eccbuf,  struct nand_oobinfo *oobsel)
+{
+	struct mtd_part *part = PART(mtd);
+	if (!(mtd->flags & MTD_WRITEABLE))
+		return -EROFS;
+	if (oobsel == NULL)
+		oobsel = &mtd->oobinfo;
+	return part->master->writev_ecc (part->master, vecs, count,
+					to + part->offset, retlen,
+					eccbuf, oobsel);
+}
+
+static int part_readv_ecc (struct mtd_info *mtd,  struct kvec *vecs,
+			 unsigned long count, loff_t from, size_t *retlen,
+			 u_char *eccbuf,  struct nand_oobinfo *oobsel)
+{
+	struct mtd_part *part = PART(mtd);
+	if (oobsel == NULL)
+		oobsel = &mtd->oobinfo;
+	return part->master->readv_ecc (part->master, vecs, count,
+					from + part->offset, retlen, 
+					eccbuf, oobsel);
+}
+
+static int part_erase (struct mtd_info *mtd, struct erase_info *instr)
+{
+	struct mtd_part *part = PART(mtd);
+	int ret;
+	if (!(mtd->flags & MTD_WRITEABLE))
+		return -EROFS;
+	if (instr->addr >= mtd->size)
+		return -EINVAL;
+	instr->addr += part->offset;
+	ret = part->master->erase(part->master, instr);
+	return ret;
+}
+
+void mtd_erase_callback(struct erase_info *instr)
+{
+	if (instr->mtd->erase == part_erase) {
+		struct mtd_part *part = PART(instr->mtd);
+
+		if (instr->fail_addr != 0xffffffff)
+			instr->fail_addr -= part->offset;
+		instr->addr -= part->offset;
+	}
+	if (instr->callback)
+		instr->callback(instr);
+}
+EXPORT_SYMBOL_GPL(mtd_erase_callback);
+
+static int part_lock (struct mtd_info *mtd, loff_t ofs, size_t len)
+{
+	struct mtd_part *part = PART(mtd);
+	if ((len + ofs) > mtd->size) 
+		return -EINVAL;
+	return part->master->lock(part->master, ofs + part->offset, len);
+}
+
+static int part_unlock (struct mtd_info *mtd, loff_t ofs, size_t len)
+{
+	struct mtd_part *part = PART(mtd);
+	if ((len + ofs) > mtd->size) 
+		return -EINVAL;
+	return part->master->unlock(part->master, ofs + part->offset, len);
+}
+
+static void part_sync(struct mtd_info *mtd)
+{
+	struct mtd_part *part = PART(mtd);
+	part->master->sync(part->master);
+}
+
+static int part_suspend(struct mtd_info *mtd)
+{
+	struct mtd_part *part = PART(mtd);
+	return part->master->suspend(part->master);
+}
+
+static void part_resume(struct mtd_info *mtd)
+{
+	struct mtd_part *part = PART(mtd);
+	part->master->resume(part->master);
+}
+
+static int part_block_isbad (struct mtd_info *mtd, loff_t ofs)
+{
+	struct mtd_part *part = PART(mtd);
+	if (ofs >= mtd->size)
+		return -EINVAL;
+	ofs += part->offset;
+	return part->master->block_isbad(part->master, ofs);
+}
+
+static int part_block_markbad (struct mtd_info *mtd, loff_t ofs)
+{
+	struct mtd_part *part = PART(mtd);
+	if (!(mtd->flags & MTD_WRITEABLE))
+		return -EROFS;
+	if (ofs >= mtd->size)
+		return -EINVAL;
+	ofs += part->offset;
+	return part->master->block_markbad(part->master, ofs);
+}
+
+/* 
+ * 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;
+		if (master->block_isbad)
+			slave->mtd.block_isbad = part_block_isbad;
+		if (master->block_markbad)
+			slave->mtd.block_markbad = part_block_markbad;
+		slave->mtd.erase = part_erase;
+		slave->master = master;
+		slave->offset = parts[i].offset;
+		slave->index = i;
+
+		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);
+		}
+
+		/* copy oobinfo from master */ 
+		memcpy(&slave->mtd.oobinfo, &master->oobinfo, sizeof(slave->mtd.oobinfo));
+
+		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 DEFINE_SPINLOCK(part_parser_lock);
+static LIST_HEAD(part_parsers);
+
+static 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 <nico@cam.org>");
+MODULE_DESCRIPTION("Generic support for partitioning of MTD devices");
+