[deliverable/linux.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 UINT_MAX
#define OFFSET_CONTINUOUS UINT_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 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 (%lx)\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 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;
	}

	for (part = partitions; part; part = part->next) {
		if ((!mtd_id) || (!strcmp(part->mtd_id, mtd_id))) {
			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;
		}
	}

	return 0;
}


/*
 * 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 */
b175d03d AN	59	#define SIZE_REMAINING UINT_MAX
b175d03d AN	60	#define OFFSET_CONTINUOUS UINT_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;
fac0077c	92	unsigned 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) {
1da177e4	107	printk(KERN_ERR ERRP "partition size too small (%lx)\n", size);
9e0606fc	108	return ERR_PTR(-EINVAL);
1da177e4 LT	109	}
	110	}
	111
	112	/* fetch partition name and flags */
	113	mask_flags = 0; /* this is going to be a regular partition */
	114	delim = 0;
fac0077c AB	115
	116	/* check for offset */
	117	if (*s == '@') {
	118	s++;
	119	offset = memparse(s, &s);
	120	}
	121
	122	/* now look for name */
1da177e4	123	if (*s == '(')
1da177e4	124	delim = ')';
97894cda	125
fac0077c	126	if (delim) {
1da177e4 LT	127	char *p;
1da177e4 LT	128
fac0077c	129	name = ++s;
ed262c4f	130	p = strchr(name, delim);
fac0077c	131	if (!p) {
1da177e4	132	printk(KERN_ERR ERRP "no closing %c found in partition name\n", delim);
9e0606fc	133	return ERR_PTR(-EINVAL);
1da177e4 LT	134	}
	135	name_len = p - name;
	136	s = p + 1;
fac0077c AB	137	} else {
fac0077c AB	138	name = NULL;
1da177e4 LT	139	name_len = 13; /* Partition_000 */
1da177e4 LT	140	}
97894cda	141
1da177e4 LT	142	/* record name length for memory allocation later */
	143	extra_mem_size += name_len + 1;
	144
fac0077c AB	145	/* test for options */
fac0077c AB	146	if (strncmp(s, "ro", 2) == 0) {
1da177e4 LT	147	mask_flags \|= MTD_WRITEABLE;
1da177e4 LT	148	s += 2;
fac0077c	149	}
1da177e4	150
fac0077c AB	151	/* if lk is found do NOT unlock the MTD partition*/
fac0077c AB	152	if (strncmp(s, "lk", 2) == 0) {
e619a75f JT	153	mask_flags \|= MTD_POWERUP_LOCK;
e619a75f JT	154	s += 2;
fac0077c	155	}
e619a75f	156
1da177e4	157	/* test if more partitions are following */
fac0077c AB	158	if (*s == ',') {
fac0077c AB	159	if (size == SIZE_REMAINING) {
1da177e4	160	printk(KERN_ERR ERRP "no partitions allowed after a fill-up partition\n");
9e0606fc	161	return ERR_PTR(-EINVAL);
1da177e4 LT	162	}
1da177e4 LT	163	/* more partitions follow, parse them */
ed262c4f AB	164	parts = newpart(s + 1, &s, num_parts, this_part + 1,
ed262c4f AB	165	&extra_mem, extra_mem_size);
9e0606fc AB	166	if (IS_ERR(parts))
9e0606fc AB	167	return parts;
fac0077c AB	168	} else {
fac0077c AB	169	/* this is the last partition: allocate space for all */
1da177e4 LT	170	int alloc_size;
	171
	172	*num_parts = this_part + 1;
	173	alloc_size = num_parts sizeof(struct mtd_partition) +
	174	extra_mem_size;
fac0077c	175
95b93a0c	176	parts = kzalloc(alloc_size, GFP_KERNEL);
1da177e4	177	if (!parts)
9e0606fc	178	return ERR_PTR(-ENOMEM);
1da177e4 LT	179	extra_mem = (unsigned char )(parts + num_parts);
1da177e4 LT	180	}
fac0077c	181
1da177e4 LT	182	/* enter this partition (offset will be calculated later if it is zero at this point) */
	183	parts[this_part].size = size;
	184	parts[this_part].offset = offset;
	185	parts[this_part].mask_flags = mask_flags;
	186	if (name)
1da177e4	187	strlcpy(extra_mem, name, name_len + 1);
1da177e4	188	else
1da177e4	189	sprintf(extra_mem, "Partition_%03d", this_part);
1da177e4 LT	190	parts[this_part].name = extra_mem;
	191	extra_mem += name_len + 1;
	192
342ba103	193	dbg(("partition %d: name <%s>, offset %llx, size %llx, mask flags %x\n",
fac0077c AB	194	this_part, parts[this_part].name, parts[this_part].offset,
fac0077c AB	195	parts[this_part].size, parts[this_part].mask_flags));
1da177e4 LT	196
	197	/* return (updated) pointer to extra_mem memory */
	198	if (extra_mem_ptr)
fac0077c	199	*extra_mem_ptr = extra_mem;
1da177e4 LT	200
	201	/* return (updated) pointer command line string */
	202	*retptr = s;
	203
	204	/* return partition table */
	205	return parts;
	206	}
	207
97894cda TG	208	/*
97894cda TG	209	* Parse the command line.
1da177e4 LT	210	*/
	211	static int mtdpart_setup_real(char *s)
	212	{
	213	cmdline_parsed = 1;
	214
	215	for( ; s != NULL; )
	216	{
	217	struct cmdline_mtd_partition *this_mtd;
	218	struct mtd_partition *parts;
fac0077c	219	int mtd_id_len, num_parts;
1da177e4 LT	220	char p, mtd_id;
1da177e4 LT	221
fac0077c AB	222	mtd_id = s;
fac0077c AB	223
1da177e4	224	/* fetch <mtd-id> */
fac0077c AB	225	p = strchr(s, ':');
fac0077c AB	226	if (!p) {
1da177e4	227	printk(KERN_ERR ERRP "no mtd-id\n");
9e0606fc	228	return -EINVAL;
1da177e4 LT	229	}
	230	mtd_id_len = p - mtd_id;
	231
	232	dbg(("parsing <%s>\n", p+1));
	233
97894cda	234	/*
1da177e4 LT	235	* parse one mtd. have it reserve memory for the
	236	* struct cmdline_mtd_partition and the mtd-id string.
	237	*/
	238	parts = newpart(p + 1, /* cmdline */
	239	&s, /* out: updated cmdline ptr */
	240	&num_parts, /* out: number of parts */
	241	0, /* first partition */
	242	(unsigned char*)&this_mtd, / out: extra mem */
97894cda	243	mtd_id_len + 1 + sizeof(*this_mtd) +
be76c5fb	244	sizeof(void)-1 /alignment*/);
fac0077c	245	if (IS_ERR(parts)) {
1da177e4 LT	246	/*
	247	* An error occurred. We're either:
	248	* a) out of memory, or
	249	* b) in the middle of the partition spec
	250	* Either way, this mtd is hosed and we're
	251	* unlikely to succeed in parsing any more
	252	*/
9e0606fc	253	return PTR_ERR(parts);
1da177e4 LT	254	}
1da177e4 LT	255
be76c5fb	256	/* align this_mtd */
97894cda	257	this_mtd = (struct cmdline_mtd_partition *)
fac0077c	258	ALIGN((unsigned long)this_mtd, sizeof(void *));
97894cda	259	/* enter results */
1da177e4 LT	260	this_mtd->parts = parts;
	261	this_mtd->num_parts = num_parts;
	262	this_mtd->mtd_id = (char*)(this_mtd + 1);
	263	strlcpy(this_mtd->mtd_id, mtd_id, mtd_id_len + 1);
	264
	265	/* link into chain */
97894cda	266	this_mtd->next = partitions;
1da177e4 LT	267	partitions = this_mtd;
1da177e4 LT	268
97894cda	269	dbg(("mtdid=<%s> num_parts=<%d>\n",
1da177e4	270	this_mtd->mtd_id, this_mtd->num_parts));
97894cda	271
1da177e4 LT	272
	273	/* EOS - we're done */
	274	if (*s == 0)
	275	break;
	276
	277	/* does another spec follow? */
fac0077c	278	if (*s != ';') {
1da177e4	279	printk(KERN_ERR ERRP "bad character after partition (%c)\n", *s);
9e0606fc	280	return -EINVAL;
1da177e4 LT	281	}
	282	s++;
	283	}
fac0077c	284
9e0606fc	285	return 0;
1da177e4 LT	286	}
	287
	288	/*
	289	* Main function to be called from the MTD mapping driver/device to
	290	* obtain the partitioning information. At this point the command line
	291	* arguments will actually be parsed and turned to struct mtd_partition
	292	* information. It returns partitions for the requested mtd device, or
	293	* the first one in the chain if a NULL mtd_id is passed in.
	294	*/
97894cda	295	static int parse_cmdline_partitions(struct mtd_info *master,
c7975330 DES	296	struct mtd_partition **pparts,
c7975330 DES	297	struct mtd_part_parser_data *data)
1da177e4 LT	298	{
1da177e4 LT	299	unsigned long offset;
9e0606fc	300	int i, err;
1da177e4	301	struct cmdline_mtd_partition *part;
36560d25	302	const char *mtd_id = master->name;
1da177e4	303
1da177e4	304	/* parse command line */
9e0606fc AB	305	if (!cmdline_parsed) {
	306	err = mtdpart_setup_real(cmdline);
	307	if (err)
	308	return err;
	309	}
1da177e4	310
fac0077c AB	311	for (part = partitions; part; part = part->next) {
	312	if ((!mtd_id) \|\| (!strcmp(part->mtd_id, mtd_id))) {
	313	for (i = 0, offset = 0; i < part->num_parts; i++) {
b175d03d	314	if (part->parts[i].offset == OFFSET_CONTINUOUS)
fac0077c	315	part->parts[i].offset = offset;
1da177e4	316	else
fac0077c AB	317	offset = part->parts[i].offset;
fac0077c AB	318
1da177e4	319	if (part->parts[i].size == SIZE_REMAINING)
fac0077c AB	320	part->parts[i].size = master->size - offset;
fac0077c AB	321
7baf0426 SL	322	if (part->parts[i].size == 0) {
	323	printk(KERN_WARNING ERRP
	324	"%s: skipping zero sized partition\n",
	325	part->mtd_id);
	326	part->num_parts--;
	327	memmove(&part->parts[i],
	328	&part->parts[i + 1],
	329	sizeof(part->parts) (part->num_parts - i));
	330	continue;
	331	}
	332
fac0077c	333	if (offset + part->parts[i].size > master->size) {
97894cda	334	printk(KERN_WARNING ERRP
1da177e4 LT	335	"%s: partitioning exceeds flash size, truncating\n",
	336	part->mtd_id);
	337	part->parts[i].size = master->size - offset;
1da177e4 LT	338	}
	339	offset += part->parts[i].size;
	340	}
fac0077c	341
17b536cc AN	342	*pparts = kmemdup(part->parts,
	343	sizeof(part->parts) part->num_parts,
	344	GFP_KERNEL);
	345	if (!*pparts)
	346	return -ENOMEM;
fac0077c	347
1da177e4 LT	348	return part->num_parts;
	349	}
	350	}
fac0077c	351
b0d06afb	352	return 0;
1da177e4 LT	353	}
	354
	355
97894cda TG	356	/*
97894cda TG	357	* This is the handler for our kernel parameter, called from
1da177e4 LT	358	* main.c::checksetup(). Note that we can not yet kmalloc() anything,
	359	* so we only save the commandline for later processing.
	360	*
	361	* This function needs to be visible for bootloaders.
	362	*/
ddacff1f	363	static int mtdpart_setup(char *s)
1da177e4 LT	364	{
	365	cmdline = s;
	366	return 1;
	367	}
	368
	369	__setup("mtdparts=", mtdpart_setup);
	370
	371	static struct mtd_part_parser cmdline_parser = {
	372	.owner = THIS_MODULE,
	373	.parse_fn = parse_cmdline_partitions,
	374	.name = "cmdlinepart",
	375	};
	376
	377	static int __init cmdline_parser_init(void)
	378	{
	379	return register_mtd_parser(&cmdline_parser);
	380	}
	381
	382	module_init(cmdline_parser_init);
	383
	384	MODULE_LICENSE("GPL");
	385	MODULE_AUTHOR("Marius Groeger <mag@sysgo.de>");
	386	MODULE_DESCRIPTION("Command line configuration of MTD partitions");