[mirror_ubuntu-artful-kernel.git] / drivers / mtd / cmdlinepart.c

/*
 * Read flash partition table from command line
 *
 * Copyright © 2002      SYSGO Real-Time Solutions GmbH
 * Copyright © 2002-2010 David Woodhouse <dwmw2@infradead.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * The format for the command line is as follows:
 *
 * mtdparts=<mtddef>[;<mtddef]
 * <mtddef>  := <mtd-id>:<partdef>[,<partdef>]
 *              where <mtd-id> is the name from the "cat /proc/mtd" command
 * <partdef> := <size>[@offset][<name>][ro][lk]
 * <mtd-id>  := unique name used in mapping driver/device (mtd->name)
 * <size>    := standard linux memsize OR "-" to denote all remaining space
 * <name>    := '(' NAME ')'
 *
 * Examples:
 *
 * 1 NOR Flash, with 1 single writable partition:
 * edb7312-nor:-
 *
 * 1 NOR Flash with 2 partitions, 1 NAND with one
 * edb7312-nor:256k(ARMboot)ro,-(root);edb7312-nand:-(home)
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/module.h>
#include <linux/err.h>

/* error message prefix */
#define ERRP "mtd: "

/* debug macro */
#if 0
#define dbg(x) do { printk("DEBUG-CMDLINE-PART: "); printk x; } while(0)
#else
#define dbg(x)
#endif


/* special size referring to all the remaining space in a partition */
#define SIZE_REMAINING ULLONG_MAX
#define OFFSET_CONTINUOUS ULLONG_MAX

struct cmdline_mtd_partition {
	struct cmdline_mtd_partition *next;
	char *mtd_id;
	int num_parts;
	struct mtd_partition *parts;
};

/* mtdpart_setup() parses into here */
static struct cmdline_mtd_partition *partitions;

/* the command line passed to mtdpart_setup() */
static char *cmdline;
static int cmdline_parsed;

/*
 * Parse one partition definition for an MTD. Since there can be many
 * comma separated partition definitions, this function calls itself
 * recursively until no more partition definitions are found. Nice side
 * effect: the memory to keep the mtd_partition structs and the names
 * is allocated upon the last definition being found. At that point the
 * syntax has been verified ok.
 */
static struct mtd_partition * newpart(char *s,
				      char **retptr,
				      int *num_parts,
				      int this_part,
				      unsigned char **extra_mem_ptr,
				      int extra_mem_size)
{
	struct mtd_partition *parts;
	unsigned long long size, offset = OFFSET_CONTINUOUS;
	char *name;
	int name_len;
	unsigned char *extra_mem;
	char delim;
	unsigned int mask_flags;

	/* fetch the partition size */
	if (*s == '-') {
		/* assign all remaining space to this partition */
		size = SIZE_REMAINING;
		s++;
	} else {
		size = memparse(s, &s);
		if (size < PAGE_SIZE) {
			printk(KERN_ERR ERRP "partition size too small (%llx)\n",
			       size);
			return ERR_PTR(-EINVAL);
		}
	}

	/* fetch partition name and flags */
	mask_flags = 0; /* this is going to be a regular partition */
	delim = 0;

	/* check for offset */
	if (*s == '@') {
		s++;
		offset = memparse(s, &s);
	}

	/* now look for name */
	if (*s == '(')
		delim = ')';

	if (delim) {
		char *p;

		name = ++s;
		p = strchr(name, delim);
		if (!p) {
			printk(KERN_ERR ERRP "no closing %c found in partition name\n", delim);
			return ERR_PTR(-EINVAL);
		}
		name_len = p - name;
		s = p + 1;
	} else {
		name = NULL;
		name_len = 13; /* Partition_000 */
	}

	/* record name length for memory allocation later */
	extra_mem_size += name_len + 1;

	/* test for options */
	if (strncmp(s, "ro", 2) == 0) {
		mask_flags |= MTD_WRITEABLE;
		s += 2;
	}

	/* if lk is found do NOT unlock the MTD partition*/
	if (strncmp(s, "lk", 2) == 0) {
		mask_flags |= MTD_POWERUP_LOCK;
		s += 2;
	}

	/* test if more partitions are following */
	if (*s == ',') {
		if (size == SIZE_REMAINING) {
			printk(KERN_ERR ERRP "no partitions allowed after a fill-up partition\n");
			return ERR_PTR(-EINVAL);
		}
		/* more partitions follow, parse them */
		parts = newpart(s + 1, &s, num_parts, this_part + 1,
				&extra_mem, extra_mem_size);
		if (IS_ERR(parts))
			return parts;
	} else {
		/* this is the last partition: allocate space for all */
		int alloc_size;

		*num_parts = this_part + 1;
		alloc_size = *num_parts * sizeof(struct mtd_partition) +
			     extra_mem_size;

		parts = kzalloc(alloc_size, GFP_KERNEL);
		if (!parts)
			return ERR_PTR(-ENOMEM);
		extra_mem = (unsigned char *)(parts + *num_parts);
	}

	/* enter this partition (offset will be calculated later if it is zero at this point) */
	parts[this_part].size = size;
	parts[this_part].offset = offset;
	parts[this_part].mask_flags = mask_flags;
	if (name)
		strlcpy(extra_mem, name, name_len + 1);
	else
		sprintf(extra_mem, "Partition_%03d", this_part);
	parts[this_part].name = extra_mem;
	extra_mem += name_len + 1;

	dbg(("partition %d: name <%s>, offset %llx, size %llx, mask flags %x\n",
	     this_part, parts[this_part].name, parts[this_part].offset,
	     parts[this_part].size, parts[this_part].mask_flags));

	/* return (updated) pointer to extra_mem memory */
	if (extra_mem_ptr)
		*extra_mem_ptr = extra_mem;

	/* return (updated) pointer command line string */
	*retptr = s;

	/* return partition table */
	return parts;
}

/*
 * Parse the command line.
 */
static int mtdpart_setup_real(char *s)
{
	cmdline_parsed = 1;

	for( ; s != NULL; )
	{
		struct cmdline_mtd_partition *this_mtd;
		struct mtd_partition *parts;
		int mtd_id_len, num_parts;
		char *p, *mtd_id;

		mtd_id = s;

		/* fetch <mtd-id> */
		p = strchr(s, ':');
		if (!p) {
			printk(KERN_ERR ERRP "no mtd-id\n");
			return -EINVAL;
		}
		mtd_id_len = p - mtd_id;

		dbg(("parsing <%s>\n", p+1));

		/*
		 * parse one mtd. have it reserve memory for the
		 * struct cmdline_mtd_partition and the mtd-id string.
		 */
		parts = newpart(p + 1,		/* cmdline */
				&s,		/* out: updated cmdline ptr */
				&num_parts,	/* out: number of parts */
				0,		/* first partition */
				(unsigned char**)&this_mtd, /* out: extra mem */
				mtd_id_len + 1 + sizeof(*this_mtd) +
				sizeof(void*)-1 /*alignment*/);
		if (IS_ERR(parts)) {
			/*
			 * An error occurred. We're either:
			 * a) out of memory, or
			 * b) in the middle of the partition spec
			 * Either way, this mtd is hosed and we're
			 * unlikely to succeed in parsing any more
			 */
			 return PTR_ERR(parts);
		 }

		/* align this_mtd */
		this_mtd = (struct cmdline_mtd_partition *)
				ALIGN((unsigned long)this_mtd, sizeof(void *));
		/* enter results */
		this_mtd->parts = parts;
		this_mtd->num_parts = num_parts;
		this_mtd->mtd_id = (char*)(this_mtd + 1);
		strlcpy(this_mtd->mtd_id, mtd_id, mtd_id_len + 1);

		/* link into chain */
		this_mtd->next = partitions;
		partitions = this_mtd;

		dbg(("mtdid=<%s> num_parts=<%d>\n",
		     this_mtd->mtd_id, this_mtd->num_parts));


		/* EOS - we're done */
		if (*s == 0)
			break;

		/* does another spec follow? */
		if (*s != ';') {
			printk(KERN_ERR ERRP "bad character after partition (%c)\n", *s);
			return -EINVAL;
		}
		s++;
	}

	return 0;
}

/*
 * Main function to be called from the MTD mapping driver/device to
 * obtain the partitioning information. At this point the command line
 * arguments will actually be parsed and turned to struct mtd_partition
 * information. It returns partitions for the requested mtd device, or
 * the first one in the chain if a NULL mtd_id is passed in.
 */
static int parse_cmdline_partitions(struct mtd_info *master,
				    struct mtd_partition **pparts,
				    struct mtd_part_parser_data *data)
{
	unsigned long long offset;
	int i, err;
	struct cmdline_mtd_partition *part;
	const char *mtd_id = master->name;

	/* parse command line */
	if (!cmdline_parsed) {
		err = mtdpart_setup_real(cmdline);
		if (err)
			return err;
	}

	/*
	 * Search for the partition definition matching master->name.
	 * If master->name is not set, stop at first partition definition.
	 */
	for (part = partitions; part; part = part->next) {
		if ((!mtd_id) || (!strcmp(part->mtd_id, mtd_id)))
			break;
	}

	if (!part)
		return 0;

	for (i = 0, offset = 0; i < part->num_parts; i++) {
		if (part->parts[i].offset == OFFSET_CONTINUOUS)
			part->parts[i].offset = offset;
		else
			offset = part->parts[i].offset;

		if (part->parts[i].size == SIZE_REMAINING)
			part->parts[i].size = master->size - offset;

		if (part->parts[i].size == 0) {
			printk(KERN_WARNING ERRP
			       "%s: skipping zero sized partition\n",
			       part->mtd_id);
			part->num_parts--;
			memmove(&part->parts[i], &part->parts[i + 1],
				sizeof(*part->parts) * (part->num_parts - i));
			continue;
		}

		if (offset + part->parts[i].size > master->size) {
			printk(KERN_WARNING ERRP
			       "%s: partitioning exceeds flash size, truncating\n",
			       part->mtd_id);
			part->parts[i].size = master->size - offset;
		}
		offset += part->parts[i].size;
	}

	*pparts = kmemdup(part->parts, sizeof(*part->parts) * part->num_parts,
			  GFP_KERNEL);
	if (!*pparts)
		return -ENOMEM;

	return part->num_parts;
}


/*
 * This is the handler for our kernel parameter, called from
 * main.c::checksetup(). Note that we can not yet kmalloc() anything,
 * so we only save the commandline for later processing.
 *
 * This function needs to be visible for bootloaders.
 */
static int mtdpart_setup(char *s)
{
	cmdline = s;
	return 1;
}

__setup("mtdparts=", mtdpart_setup);

static struct mtd_part_parser cmdline_parser = {
	.owner = THIS_MODULE,
	.parse_fn = parse_cmdline_partitions,
	.name = "cmdlinepart",
};

static int __init cmdline_parser_init(void)
{
	return register_mtd_parser(&cmdline_parser);
}

module_init(cmdline_parser_init);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Marius Groeger <mag@sysgo.de>");
MODULE_DESCRIPTION("Command line configuration of MTD partitions");
Commit	Line	Data
1da177e4	1	/*
1da177e4 LT	2	* Read flash partition table from command line
1da177e4 LT	3	*
a1452a37 DW	4	* Copyright © 2002 SYSGO Real-Time Solutions GmbH
	5	* Copyright © 2002-2010 David Woodhouse <dwmw2@infradead.org>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1da177e4 LT	20	*
1da177e4 LT	21	* The format for the command line is as follows:
97894cda	22	*
1da177e4 LT	23	* mtdparts=<mtddef>[;<mtddef]
1da177e4 LT	24	* <mtddef> := <mtd-id>:<partdef>[,<partdef>]
a0ee24a0	25	* where <mtd-id> is the name from the "cat /proc/mtd" command
e619a75f	26	* <partdef> := <size>[@offset][<name>][ro][lk]
1da177e4 LT	27	* <mtd-id> := unique name used in mapping driver/device (mtd->name)
	28	* <size> := standard linux memsize OR "-" to denote all remaining space
	29	* <name> := '(' NAME ')'
97894cda	30	*
1da177e4	31	* Examples:
97894cda	32	*
1da177e4 LT	33	* 1 NOR Flash, with 1 single writable partition:
1da177e4 LT	34	* edb7312-nor:-
97894cda	35	*
1da177e4 LT	36	* 1 NOR Flash with 2 partitions, 1 NAND with one
	37	* edb7312-nor:256k(ARMboot)ro,-(root);edb7312-nand:-(home)
	38	*/
	39
	40	#include <linux/kernel.h>
	41	#include <linux/slab.h>
1da177e4 LT	42	#include <linux/mtd/mtd.h>
1da177e4 LT	43	#include <linux/mtd/partitions.h>
a0e5cc58	44	#include <linux/module.h>
9e0606fc	45	#include <linux/err.h>
1da177e4 LT	46
	47	/* error message prefix */
	48	#define ERRP "mtd: "
	49
	50	/* debug macro */
	51	#if 0
	52	#define dbg(x) do { printk("DEBUG-CMDLINE-PART: "); printk x; } while(0)
	53	#else
	54	#define dbg(x)
	55	#endif
	56
	57
	58	/* special size referring to all the remaining space in a partition */
6f9f59ee HS	59	#define SIZE_REMAINING ULLONG_MAX
6f9f59ee HS	60	#define OFFSET_CONTINUOUS ULLONG_MAX
1da177e4 LT	61
	62	struct cmdline_mtd_partition {
	63	struct cmdline_mtd_partition *next;
	64	char *mtd_id;
	65	int num_parts;
	66	struct mtd_partition *parts;
	67	};
	68
	69	/* mtdpart_setup() parses into here */
	70	static struct cmdline_mtd_partition *partitions;
	71
8abc0d4a	72	/* the command line passed to mtdpart_setup() */
1da177e4	73	static char *cmdline;
aa3c5dc5	74	static int cmdline_parsed;
1da177e4 LT	75
	76	/*
	77	* Parse one partition definition for an MTD. Since there can be many
97894cda	78	* comma separated partition definitions, this function calls itself
1da177e4 LT	79	* recursively until no more partition definitions are found. Nice side
	80	* effect: the memory to keep the mtd_partition structs and the names
	81	* is allocated upon the last definition being found. At that point the
	82	* syntax has been verified ok.
	83	*/
97894cda	84	static struct mtd_partition * newpart(char *s,
fac0077c AB	85	char **retptr,
	86	int *num_parts,
	87	int this_part,
	88	unsigned char **extra_mem_ptr,
	89	int extra_mem_size)
1da177e4 LT	90	{
1da177e4 LT	91	struct mtd_partition *parts;
6f9f59ee	92	unsigned long long size, offset = OFFSET_CONTINUOUS;
1da177e4 LT	93	char *name;
	94	int name_len;
	95	unsigned char *extra_mem;
	96	char delim;
	97	unsigned int mask_flags;
	98
	99	/* fetch the partition size */
fac0077c AB	100	if (*s == '-') {
fac0077c AB	101	/* assign all remaining space to this partition */
1da177e4 LT	102	size = SIZE_REMAINING;
1da177e4 LT	103	s++;
fac0077c	104	} else {
1da177e4	105	size = memparse(s, &s);
fac0077c	106	if (size < PAGE_SIZE) {
6f9f59ee HS	107	printk(KERN_ERR ERRP "partition size too small (%llx)\n",
6f9f59ee HS	108	size);
9e0606fc	109	return ERR_PTR(-EINVAL);
1da177e4 LT	110	}
	111	}
	112
	113	/* fetch partition name and flags */
	114	mask_flags = 0; /* this is going to be a regular partition */
	115	delim = 0;
fac0077c AB	116
	117	/* check for offset */
	118	if (*s == '@') {
	119	s++;
	120	offset = memparse(s, &s);
	121	}
	122
	123	/* now look for name */
1da177e4	124	if (*s == '(')
1da177e4	125	delim = ')';
97894cda	126
fac0077c	127	if (delim) {
1da177e4 LT	128	char *p;
1da177e4 LT	129
fac0077c	130	name = ++s;
ed262c4f	131	p = strchr(name, delim);
fac0077c	132	if (!p) {
1da177e4	133	printk(KERN_ERR ERRP "no closing %c found in partition name\n", delim);
9e0606fc	134	return ERR_PTR(-EINVAL);
1da177e4 LT	135	}
	136	name_len = p - name;
	137	s = p + 1;
fac0077c AB	138	} else {
fac0077c AB	139	name = NULL;
1da177e4 LT	140	name_len = 13; /* Partition_000 */
1da177e4 LT	141	}
97894cda	142
1da177e4 LT	143	/* record name length for memory allocation later */
	144	extra_mem_size += name_len + 1;
	145
fac0077c AB	146	/* test for options */
fac0077c AB	147	if (strncmp(s, "ro", 2) == 0) {
1da177e4 LT	148	mask_flags \|= MTD_WRITEABLE;
1da177e4 LT	149	s += 2;
fac0077c	150	}
1da177e4	151
fac0077c AB	152	/* if lk is found do NOT unlock the MTD partition*/
fac0077c AB	153	if (strncmp(s, "lk", 2) == 0) {
e619a75f JT	154	mask_flags \|= MTD_POWERUP_LOCK;
e619a75f JT	155	s += 2;
fac0077c	156	}
e619a75f	157
1da177e4	158	/* test if more partitions are following */
fac0077c AB	159	if (*s == ',') {
fac0077c AB	160	if (size == SIZE_REMAINING) {
1da177e4	161	printk(KERN_ERR ERRP "no partitions allowed after a fill-up partition\n");
9e0606fc	162	return ERR_PTR(-EINVAL);
1da177e4 LT	163	}
1da177e4 LT	164	/* more partitions follow, parse them */
ed262c4f AB	165	parts = newpart(s + 1, &s, num_parts, this_part + 1,
ed262c4f AB	166	&extra_mem, extra_mem_size);
9e0606fc AB	167	if (IS_ERR(parts))
9e0606fc AB	168	return parts;
fac0077c AB	169	} else {
fac0077c AB	170	/* this is the last partition: allocate space for all */
1da177e4 LT	171	int alloc_size;
	172
	173	*num_parts = this_part + 1;
	174	alloc_size = num_parts sizeof(struct mtd_partition) +
	175	extra_mem_size;
fac0077c	176
95b93a0c	177	parts = kzalloc(alloc_size, GFP_KERNEL);
1da177e4	178	if (!parts)
9e0606fc	179	return ERR_PTR(-ENOMEM);
1da177e4 LT	180	extra_mem = (unsigned char )(parts + num_parts);
1da177e4 LT	181	}
fac0077c	182
1da177e4 LT	183	/* enter this partition (offset will be calculated later if it is zero at this point) */
	184	parts[this_part].size = size;
	185	parts[this_part].offset = offset;
	186	parts[this_part].mask_flags = mask_flags;
	187	if (name)
1da177e4	188	strlcpy(extra_mem, name, name_len + 1);
1da177e4	189	else
1da177e4	190	sprintf(extra_mem, "Partition_%03d", this_part);
1da177e4 LT	191	parts[this_part].name = extra_mem;
	192	extra_mem += name_len + 1;
	193
342ba103	194	dbg(("partition %d: name <%s>, offset %llx, size %llx, mask flags %x\n",
fac0077c AB	195	this_part, parts[this_part].name, parts[this_part].offset,
fac0077c AB	196	parts[this_part].size, parts[this_part].mask_flags));
1da177e4 LT	197
	198	/* return (updated) pointer to extra_mem memory */
	199	if (extra_mem_ptr)
fac0077c	200	*extra_mem_ptr = extra_mem;
1da177e4 LT	201
	202	/* return (updated) pointer command line string */
	203	*retptr = s;
	204
	205	/* return partition table */
	206	return parts;
	207	}
	208
97894cda TG	209	/*
97894cda TG	210	* Parse the command line.
1da177e4 LT	211	*/
	212	static int mtdpart_setup_real(char *s)
	213	{
	214	cmdline_parsed = 1;
	215
	216	for( ; s != NULL; )
	217	{
	218	struct cmdline_mtd_partition *this_mtd;
	219	struct mtd_partition *parts;
fac0077c	220	int mtd_id_len, num_parts;
1da177e4 LT	221	char p, mtd_id;
1da177e4 LT	222
fac0077c AB	223	mtd_id = s;
fac0077c AB	224
1da177e4	225	/* fetch <mtd-id> */
fac0077c AB	226	p = strchr(s, ':');
fac0077c AB	227	if (!p) {
1da177e4	228	printk(KERN_ERR ERRP "no mtd-id\n");
9e0606fc	229	return -EINVAL;
1da177e4 LT	230	}
	231	mtd_id_len = p - mtd_id;
	232
	233	dbg(("parsing <%s>\n", p+1));
	234
97894cda	235	/*
1da177e4 LT	236	* parse one mtd. have it reserve memory for the
	237	* struct cmdline_mtd_partition and the mtd-id string.
	238	*/
	239	parts = newpart(p + 1, /* cmdline */
	240	&s, /* out: updated cmdline ptr */
	241	&num_parts, /* out: number of parts */
	242	0, /* first partition */
	243	(unsigned char*)&this_mtd, / out: extra mem */
97894cda	244	mtd_id_len + 1 + sizeof(*this_mtd) +
be76c5fb	245	sizeof(void)-1 /alignment*/);
fac0077c	246	if (IS_ERR(parts)) {
1da177e4 LT	247	/*
	248	* An error occurred. We're either:
	249	* a) out of memory, or
	250	* b) in the middle of the partition spec
	251	* Either way, this mtd is hosed and we're
	252	* unlikely to succeed in parsing any more
	253	*/
9e0606fc	254	return PTR_ERR(parts);
1da177e4 LT	255	}
1da177e4 LT	256
be76c5fb	257	/* align this_mtd */
97894cda	258	this_mtd = (struct cmdline_mtd_partition *)
fac0077c	259	ALIGN((unsigned long)this_mtd, sizeof(void *));
97894cda	260	/* enter results */
1da177e4 LT	261	this_mtd->parts = parts;
	262	this_mtd->num_parts = num_parts;
	263	this_mtd->mtd_id = (char*)(this_mtd + 1);
	264	strlcpy(this_mtd->mtd_id, mtd_id, mtd_id_len + 1);
	265
	266	/* link into chain */
97894cda	267	this_mtd->next = partitions;
1da177e4 LT	268	partitions = this_mtd;
1da177e4 LT	269
97894cda	270	dbg(("mtdid=<%s> num_parts=<%d>\n",
1da177e4	271	this_mtd->mtd_id, this_mtd->num_parts));
97894cda	272
1da177e4 LT	273
	274	/* EOS - we're done */
	275	if (*s == 0)
	276	break;
	277
	278	/* does another spec follow? */
fac0077c	279	if (*s != ';') {
1da177e4	280	printk(KERN_ERR ERRP "bad character after partition (%c)\n", *s);
9e0606fc	281	return -EINVAL;
1da177e4 LT	282	}
	283	s++;
	284	}
fac0077c	285
9e0606fc	286	return 0;
1da177e4 LT	287	}
	288
	289	/*
	290	* Main function to be called from the MTD mapping driver/device to
	291	* obtain the partitioning information. At this point the command line
	292	* arguments will actually be parsed and turned to struct mtd_partition
	293	* information. It returns partitions for the requested mtd device, or
	294	* the first one in the chain if a NULL mtd_id is passed in.
	295	*/
97894cda	296	static int parse_cmdline_partitions(struct mtd_info *master,
c7975330 DES	297	struct mtd_partition **pparts,
c7975330 DES	298	struct mtd_part_parser_data *data)
1da177e4	299	{
6f9f59ee	300	unsigned long long offset;
9e0606fc	301	int i, err;
1da177e4	302	struct cmdline_mtd_partition *part;
36560d25	303	const char *mtd_id = master->name;
1da177e4	304
1da177e4	305	/* parse command line */
9e0606fc AB	306	if (!cmdline_parsed) {
	307	err = mtdpart_setup_real(cmdline);
	308	if (err)
	309	return err;
	310	}
1da177e4	311
438db5a9 SL	312	/*
	313	* Search for the partition definition matching master->name.
	314	* If master->name is not set, stop at first partition definition.
	315	*/
fac0077c	316	for (part = partitions; part; part = part->next) {
438db5a9 SL	317	if ((!mtd_id) \|\| (!strcmp(part->mtd_id, mtd_id)))
	318	break;
	319	}
	320
	321	if (!part)
	322	return 0;
	323
	324	for (i = 0, offset = 0; i < part->num_parts; i++) {
	325	if (part->parts[i].offset == OFFSET_CONTINUOUS)
	326	part->parts[i].offset = offset;
	327	else
	328	offset = part->parts[i].offset;
	329
	330	if (part->parts[i].size == SIZE_REMAINING)
	331	part->parts[i].size = master->size - offset;
	332
	333	if (part->parts[i].size == 0) {
	334	printk(KERN_WARNING ERRP
	335	"%s: skipping zero sized partition\n",
	336	part->mtd_id);
	337	part->num_parts--;
	338	memmove(&part->parts[i], &part->parts[i + 1],
	339	sizeof(part->parts) (part->num_parts - i));
	340	continue;
1da177e4	341	}
438db5a9 SL	342
	343	if (offset + part->parts[i].size > master->size) {
	344	printk(KERN_WARNING ERRP
	345	"%s: partitioning exceeds flash size, truncating\n",
	346	part->mtd_id);
	347	part->parts[i].size = master->size - offset;
	348	}
	349	offset += part->parts[i].size;
1da177e4	350	}
fac0077c	351
438db5a9 SL	352	pparts = kmemdup(part->parts, sizeof(part->parts) * part->num_parts,
	353	GFP_KERNEL);
	354	if (!*pparts)
	355	return -ENOMEM;
	356
	357	return part->num_parts;
1da177e4 LT	358	}
	359
	360
97894cda TG	361	/*
97894cda TG	362	* This is the handler for our kernel parameter, called from
1da177e4 LT	363	* main.c::checksetup(). Note that we can not yet kmalloc() anything,
	364	* so we only save the commandline for later processing.
	365	*
	366	* This function needs to be visible for bootloaders.
	367	*/
ddacff1f	368	static int mtdpart_setup(char *s)
1da177e4 LT	369	{
	370	cmdline = s;
	371	return 1;
	372	}
	373
	374	__setup("mtdparts=", mtdpart_setup);
	375
	376	static struct mtd_part_parser cmdline_parser = {
	377	.owner = THIS_MODULE,
	378	.parse_fn = parse_cmdline_partitions,
	379	.name = "cmdlinepart",
	380	};
	381
	382	static int __init cmdline_parser_init(void)
	383	{
	384	return register_mtd_parser(&cmdline_parser);
	385	}
	386
	387	module_init(cmdline_parser_init);
	388
	389	MODULE_LICENSE("GPL");
	390	MODULE_AUTHOR("Marius Groeger <mag@sysgo.de>");
	391	MODULE_DESCRIPTION("Command line configuration of MTD partitions");