[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 <[email protected]>
 *
 * 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/bootmem.h>
#include <linux/module.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 = 0;

/*
 * 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;
	unsigned long 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 NULL;
		}
	}

	/* 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 NULL;
		}
		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 NULL;
		}
		/* more partitions follow, parse them */
		parts = newpart(s + 1, &s, num_parts, this_part + 1,
				&extra_mem, extra_mem_size);
		if (!parts)
			return NULL;
	}
	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 NULL;
		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;
		int num_parts;
		char *p, *mtd_id;

	    	mtd_id = s;
		/* fetch <mtd-id> */
		if (!(p = strchr(s, ':')))
		{
			printk(KERN_ERR ERRP "no mtd-id\n");
			return 0;
		}
		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(!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 0;
		 }

		/* 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 0;
		}
		s++;
	}
	return 1;
}

/*
 * 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;
	struct cmdline_mtd_partition *part;
	const char *mtd_id = master->name;

	/* parse command line */
	if (!cmdline_parsed)
		mtdpart_setup_real(cmdline);

	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 (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;
					part->num_parts = i;
				}
				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 <[email protected]>");
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 <[email protected]>
	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>
	42
	43	#include <linux/mtd/mtd.h>
	44	#include <linux/mtd/partitions.h>
	45	#include <linux/bootmem.h>
a0e5cc58	46	#include <linux/module.h>
1da177e4 LT	47
	48	/* error message prefix */
	49	#define ERRP "mtd: "
	50
	51	/* debug macro */
	52	#if 0
	53	#define dbg(x) do { printk("DEBUG-CMDLINE-PART: "); printk x; } while(0)
	54	#else
	55	#define dbg(x)
	56	#endif
	57
	58
	59	/* special size referring to all the remaining space in a partition */
b175d03d AN	60	#define SIZE_REMAINING UINT_MAX
b175d03d AN	61	#define OFFSET_CONTINUOUS UINT_MAX
1da177e4 LT	62
	63	struct cmdline_mtd_partition {
	64	struct cmdline_mtd_partition *next;
	65	char *mtd_id;
	66	int num_parts;
	67	struct mtd_partition *parts;
	68	};
	69
	70	/* mtdpart_setup() parses into here */
	71	static struct cmdline_mtd_partition *partitions;
	72
8abc0d4a	73	/* the command line passed to mtdpart_setup() */
1da177e4 LT	74	static char *cmdline;
	75	static int cmdline_parsed = 0;
	76
	77	/*
	78	* Parse one partition definition for an MTD. Since there can be many
97894cda	79	* comma separated partition definitions, this function calls itself
1da177e4 LT	80	* recursively until no more partition definitions are found. Nice side
	81	* effect: the memory to keep the mtd_partition structs and the names
	82	* is allocated upon the last definition being found. At that point the
	83	* syntax has been verified ok.
	84	*/
97894cda	85	static struct mtd_partition * newpart(char *s,
1da177e4 LT	86	char **retptr,
1da177e4 LT	87	int *num_parts,
97894cda TG	88	int this_part,
97894cda TG	89	unsigned char **extra_mem_ptr,
1da177e4 LT	90	int extra_mem_size)
	91	{
	92	struct mtd_partition *parts;
	93	unsigned long size;
b175d03d	94	unsigned long offset = OFFSET_CONTINUOUS;
1da177e4 LT	95	char *name;
	96	int name_len;
	97	unsigned char *extra_mem;
	98	char delim;
	99	unsigned int mask_flags;
	100
	101	/* fetch the partition size */
	102	if (*s == '-')
	103	{ /* assign all remaining space to this partition */
	104	size = SIZE_REMAINING;
	105	s++;
	106	}
	107	else
	108	{
	109	size = memparse(s, &s);
	110	if (size < PAGE_SIZE)
	111	{
	112	printk(KERN_ERR ERRP "partition size too small (%lx)\n", size);
	113	return NULL;
	114	}
	115	}
	116
	117	/* fetch partition name and flags */
	118	mask_flags = 0; /* this is going to be a regular partition */
	119	delim = 0;
	120	/* check for offset */
97894cda	121	if (*s == '@')
1da177e4 LT	122	{
	123	s++;
	124	offset = memparse(s, &s);
	125	}
	126	/* now look for name */
	127	if (*s == '(')
	128	{
	129	delim = ')';
	130	}
97894cda	131
1da177e4 LT	132	if (delim)
	133	{
	134	char *p;
	135
	136	name = ++s;
ed262c4f AB	137	p = strchr(name, delim);
ed262c4f AB	138	if (!p)
1da177e4 LT	139	{
	140	printk(KERN_ERR ERRP "no closing %c found in partition name\n", delim);
	141	return NULL;
	142	}
	143	name_len = p - name;
	144	s = p + 1;
	145	}
	146	else
	147	{
	148	name = NULL;
	149	name_len = 13; /* Partition_000 */
	150	}
97894cda	151
1da177e4 LT	152	/* record name length for memory allocation later */
	153	extra_mem_size += name_len + 1;
	154
	155	/* test for options */
97894cda	156	if (strncmp(s, "ro", 2) == 0)
1da177e4 LT	157	{
	158	mask_flags \|= MTD_WRITEABLE;
	159	s += 2;
	160	}
	161
e619a75f JT	162	/* if lk is found do NOT unlock the MTD partition*/
	163	if (strncmp(s, "lk", 2) == 0)
	164	{
	165	mask_flags \|= MTD_POWERUP_LOCK;
	166	s += 2;
	167	}
	168
1da177e4 LT	169	/* test if more partitions are following */
	170	if (*s == ',')
	171	{
	172	if (size == SIZE_REMAINING)
	173	{
	174	printk(KERN_ERR ERRP "no partitions allowed after a fill-up partition\n");
	175	return NULL;
	176	}
	177	/* more partitions follow, parse them */
ed262c4f AB	178	parts = newpart(s + 1, &s, num_parts, this_part + 1,
	179	&extra_mem, extra_mem_size);
	180	if (!parts)
	181	return NULL;
1da177e4 LT	182	}
	183	else
	184	{ /* this is the last partition: allocate space for all */
	185	int alloc_size;
	186
	187	*num_parts = this_part + 1;
	188	alloc_size = num_parts sizeof(struct mtd_partition) +
	189	extra_mem_size;
95b93a0c	190	parts = kzalloc(alloc_size, GFP_KERNEL);
1da177e4	191	if (!parts)
1da177e4	192	return NULL;
1da177e4 LT	193	extra_mem = (unsigned char )(parts + num_parts);
	194	}
	195	/* enter this partition (offset will be calculated later if it is zero at this point) */
	196	parts[this_part].size = size;
	197	parts[this_part].offset = offset;
	198	parts[this_part].mask_flags = mask_flags;
	199	if (name)
	200	{
	201	strlcpy(extra_mem, name, name_len + 1);
	202	}
	203	else
	204	{
	205	sprintf(extra_mem, "Partition_%03d", this_part);
	206	}
	207	parts[this_part].name = extra_mem;
	208	extra_mem += name_len + 1;
	209
342ba103	210	dbg(("partition %d: name <%s>, offset %llx, size %llx, mask flags %x\n",
97894cda	211	this_part,
1da177e4 LT	212	parts[this_part].name,
	213	parts[this_part].offset,
	214	parts[this_part].size,
	215	parts[this_part].mask_flags));
	216
	217	/* return (updated) pointer to extra_mem memory */
	218	if (extra_mem_ptr)
	219	*extra_mem_ptr = extra_mem;
	220
	221	/* return (updated) pointer command line string */
	222	*retptr = s;
	223
	224	/* return partition table */
	225	return parts;
	226	}
	227
97894cda TG	228	/*
97894cda TG	229	* Parse the command line.
1da177e4 LT	230	*/
	231	static int mtdpart_setup_real(char *s)
	232	{
	233	cmdline_parsed = 1;
	234
	235	for( ; s != NULL; )
	236	{
	237	struct cmdline_mtd_partition *this_mtd;
	238	struct mtd_partition *parts;
	239	int mtd_id_len;
	240	int num_parts;
	241	char p, mtd_id;
	242
	243	mtd_id = s;
	244	/* fetch <mtd-id> */
	245	if (!(p = strchr(s, ':')))
	246	{
	247	printk(KERN_ERR ERRP "no mtd-id\n");
	248	return 0;
	249	}
	250	mtd_id_len = p - mtd_id;
	251
	252	dbg(("parsing <%s>\n", p+1));
	253
97894cda	254	/*
1da177e4 LT	255	* parse one mtd. have it reserve memory for the
	256	* struct cmdline_mtd_partition and the mtd-id string.
	257	*/
	258	parts = newpart(p + 1, /* cmdline */
	259	&s, /* out: updated cmdline ptr */
	260	&num_parts, /* out: number of parts */
	261	0, /* first partition */
	262	(unsigned char*)&this_mtd, / out: extra mem */
97894cda	263	mtd_id_len + 1 + sizeof(*this_mtd) +
be76c5fb	264	sizeof(void)-1 /alignment*/);
1da177e4 LT	265	if(!parts)
	266	{
	267	/*
	268	* An error occurred. We're either:
	269	* a) out of memory, or
	270	* b) in the middle of the partition spec
	271	* Either way, this mtd is hosed and we're
	272	* unlikely to succeed in parsing any more
	273	*/
	274	return 0;
	275	}
	276
be76c5fb	277	/* align this_mtd */
97894cda	278	this_mtd = (struct cmdline_mtd_partition *)
be76c5fb	279	ALIGN((unsigned long)this_mtd, sizeof(void*));
97894cda	280	/* enter results */
1da177e4 LT	281	this_mtd->parts = parts;
	282	this_mtd->num_parts = num_parts;
	283	this_mtd->mtd_id = (char*)(this_mtd + 1);
	284	strlcpy(this_mtd->mtd_id, mtd_id, mtd_id_len + 1);
	285
	286	/* link into chain */
97894cda	287	this_mtd->next = partitions;
1da177e4 LT	288	partitions = this_mtd;
1da177e4 LT	289
97894cda	290	dbg(("mtdid=<%s> num_parts=<%d>\n",
1da177e4	291	this_mtd->mtd_id, this_mtd->num_parts));
97894cda	292
1da177e4 LT	293
	294	/* EOS - we're done */
	295	if (*s == 0)
	296	break;
	297
	298	/* does another spec follow? */
	299	if (*s != ';')
	300	{
	301	printk(KERN_ERR ERRP "bad character after partition (%c)\n", *s);
	302	return 0;
	303	}
	304	s++;
	305	}
	306	return 1;
	307	}
	308
	309	/*
	310	* Main function to be called from the MTD mapping driver/device to
	311	* obtain the partitioning information. At this point the command line
	312	* arguments will actually be parsed and turned to struct mtd_partition
	313	* information. It returns partitions for the requested mtd device, or
	314	* the first one in the chain if a NULL mtd_id is passed in.
	315	*/
97894cda	316	static int parse_cmdline_partitions(struct mtd_info *master,
c7975330 DB	317	struct mtd_partition **pparts,
c7975330 DB	318	struct mtd_part_parser_data *data)
1da177e4 LT	319	{
	320	unsigned long offset;
	321	int i;
	322	struct cmdline_mtd_partition *part;
36560d25	323	const char *mtd_id = master->name;
1da177e4	324
1da177e4 LT	325	/* parse command line */
	326	if (!cmdline_parsed)
	327	mtdpart_setup_real(cmdline);
	328
	329	for(part = partitions; part; part = part->next)
	330	{
	331	if ((!mtd_id) \|\| (!strcmp(part->mtd_id, mtd_id)))
	332	{
	333	for(i = 0, offset = 0; i < part->num_parts; i++)
	334	{
b175d03d	335	if (part->parts[i].offset == OFFSET_CONTINUOUS)
1da177e4 LT	336	part->parts[i].offset = offset;
	337	else
	338	offset = part->parts[i].offset;
	339	if (part->parts[i].size == SIZE_REMAINING)
	340	part->parts[i].size = master->size - offset;
	341	if (offset + part->parts[i].size > master->size)
	342	{
97894cda	343	printk(KERN_WARNING ERRP
1da177e4 LT	344	"%s: partitioning exceeds flash size, truncating\n",
	345	part->mtd_id);
	346	part->parts[i].size = master->size - offset;
	347	part->num_parts = i;
	348	}
	349	offset += part->parts[i].size;
	350	}
17b536cc AN	351	*pparts = kmemdup(part->parts,
	352	sizeof(part->parts) part->num_parts,
	353	GFP_KERNEL);
	354	if (!*pparts)
	355	return -ENOMEM;
1da177e4 LT	356	return part->num_parts;
	357	}
	358	}
b0d06afb	359	return 0;
1da177e4 LT	360	}
	361
	362
97894cda TG	363	/*
97894cda TG	364	* This is the handler for our kernel parameter, called from
1da177e4 LT	365	* main.c::checksetup(). Note that we can not yet kmalloc() anything,
	366	* so we only save the commandline for later processing.
	367	*
	368	* This function needs to be visible for bootloaders.
	369	*/
ddacff1f	370	static int mtdpart_setup(char *s)
1da177e4 LT	371	{
	372	cmdline = s;
	373	return 1;
	374	}
	375
	376	__setup("mtdparts=", mtdpart_setup);
	377
	378	static struct mtd_part_parser cmdline_parser = {
	379	.owner = THIS_MODULE,
	380	.parse_fn = parse_cmdline_partitions,
	381	.name = "cmdlinepart",
	382	};
	383
	384	static int __init cmdline_parser_init(void)
	385	{
	386	return register_mtd_parser(&cmdline_parser);
	387	}
	388
	389	module_init(cmdline_parser_init);
	390
	391	MODULE_LICENSE("GPL");
	392	MODULE_AUTHOR("Marius Groeger <[email protected]>");
	393	MODULE_DESCRIPTION("Command line configuration of MTD partitions");