[deliverable/linux.git] / drivers / mtd / ofpart.c

/*
 * Flash partitions described by the OF (or flattened) device tree
 *
 * Copyright © 2006 MontaVista Software Inc.
 * Author: Vitaly Wool <vwool@ru.mvista.com>
 *
 * Revised to handle newer style flash binding by:
 *   Copyright © 2007 David Gibson, IBM Corporation.
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/mtd/mtd.h>
#include <linux/slab.h>
#include <linux/mtd/partitions.h>

static int parse_ofpart_partitions(struct mtd_info *master,
				   struct mtd_partition **pparts,
				   struct mtd_part_parser_data *data)
{
	struct device_node *node;
	const char *partname;
	struct device_node *pp;
	int nr_parts, i;


	if (!data)
		return 0;

	node = data->of_node;
	if (!node)
		return 0;

	/* First count the subnodes */
	pp = NULL;
	nr_parts = 0;
	while ((pp = of_get_next_child(node, pp)))
		nr_parts++;

	if (nr_parts == 0)
		return 0;

	*pparts = kzalloc(nr_parts * sizeof(**pparts), GFP_KERNEL);
	if (!*pparts)
		return -ENOMEM;

	pp = NULL;
	i = 0;
	while ((pp = of_get_next_child(node, pp))) {
		const __be32 *reg;
		int len;
		int a_cells, s_cells;

		reg = of_get_property(pp, "reg", &len);
		if (!reg) {
			nr_parts--;
			continue;
		}

		a_cells = of_n_addr_cells(pp);
		s_cells = of_n_size_cells(pp);
		(*pparts)[i].offset = of_read_number(reg, a_cells);
		(*pparts)[i].size = of_read_number(reg + a_cells, s_cells);

		partname = of_get_property(pp, "label", &len);
		if (!partname)
			partname = of_get_property(pp, "name", &len);
		(*pparts)[i].name = (char *)partname;

		if (of_get_property(pp, "read-only", &len))
			(*pparts)[i].mask_flags |= MTD_WRITEABLE;

		if (of_get_property(pp, "lock", &len))
			(*pparts)[i].mask_flags |= MTD_POWERUP_LOCK;

		i++;
	}

	if (!i) {
		of_node_put(pp);
		pr_err("No valid partition found on %s\n", node->full_name);
		kfree(*pparts);
		*pparts = NULL;
		return -EINVAL;
	}

	return nr_parts;
}

static struct mtd_part_parser ofpart_parser = {
	.owner = THIS_MODULE,
	.parse_fn = parse_ofpart_partitions,
	.name = "ofpart",
};

static int parse_ofoldpart_partitions(struct mtd_info *master,
				      struct mtd_partition **pparts,
				      struct mtd_part_parser_data *data)
{
	struct device_node *dp;
	int i, plen, nr_parts;
	const struct {
		__be32 offset, len;
	} *part;
	const char *names;

	if (!data)
		return 0;

	dp = data->of_node;
	if (!dp)
		return 0;

	part = of_get_property(dp, "partitions", &plen);
	if (!part)
		return 0; /* No partitions found */

	pr_warning("Device tree uses obsolete partition map binding: %s\n",
			dp->full_name);

	nr_parts = plen / sizeof(part[0]);

	*pparts = kzalloc(nr_parts * sizeof(*(*pparts)), GFP_KERNEL);
	if (!*pparts)
		return -ENOMEM;

	names = of_get_property(dp, "partition-names", &plen);

	for (i = 0; i < nr_parts; i++) {
		(*pparts)[i].offset = be32_to_cpu(part->offset);
		(*pparts)[i].size   = be32_to_cpu(part->len) & ~1;
		/* bit 0 set signifies read only partition */
		if (be32_to_cpu(part->len) & 1)
			(*pparts)[i].mask_flags = MTD_WRITEABLE;

		if (names && (plen > 0)) {
			int len = strlen(names) + 1;

			(*pparts)[i].name = (char *)names;
			plen -= len;
			names += len;
		} else {
			(*pparts)[i].name = "unnamed";
		}

		part++;
	}

	return nr_parts;
}

static struct mtd_part_parser ofoldpart_parser = {
	.owner = THIS_MODULE,
	.parse_fn = parse_ofoldpart_partitions,
	.name = "ofoldpart",
};

static int __init ofpart_parser_init(void)
{
	int rc;
	rc = register_mtd_parser(&ofpart_parser);
	if (rc)
		goto out;

	rc = register_mtd_parser(&ofoldpart_parser);
	if (!rc)
		return 0;

	deregister_mtd_parser(&ofoldpart_parser);
out:
	return rc;
}

static void __exit ofpart_parser_exit(void)
{
	deregister_mtd_parser(&ofpart_parser);
	deregister_mtd_parser(&ofoldpart_parser);
}

module_init(ofpart_parser_init);
module_exit(ofpart_parser_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Parser for MTD partitioning information in device tree");
MODULE_AUTHOR("Vitaly Wool, David Gibson");
/*
 * When MTD core cannot find the requested parser, it tries to load the module
 * with the same name. Since we provide the ofoldpart parser, we should have
 * the corresponding alias.
 */
MODULE_ALIAS("ofoldpart");
Commit	Line	Data
9a310d21 SW	1	/*
	2	* Flash partitions described by the OF (or flattened) device tree
	3	*
a1452a37	4	* Copyright © 2006 MontaVista Software Inc.
9a310d21 SW	5	* Author: Vitaly Wool <vwool@ru.mvista.com>
	6	*
	7	* Revised to handle newer style flash binding by:
a1452a37	8	* Copyright © 2007 David Gibson, IBM Corporation.
9a310d21 SW	9	*
	10	* This program is free software; you can redistribute it and/or modify it
	11	* under the terms of the GNU General Public License as published by the
	12	* Free Software Foundation; either version 2 of the License, or (at your
	13	* option) any later version.
	14	*/
	15
	16	#include <linux/module.h>
	17	#include <linux/init.h>
	18	#include <linux/of.h>
	19	#include <linux/mtd/mtd.h>
5a0e3ad6	20	#include <linux/slab.h>
9a310d21 SW	21	#include <linux/mtd/partitions.h>
9a310d21 SW	22
d26c87d6 DES	23	static int parse_ofpart_partitions(struct mtd_info *master,
	24	struct mtd_partition **pparts,
	25	struct mtd_part_parser_data *data)
	26	{
628376fb	27	struct device_node *node;
9a310d21 SW	28	const char *partname;
	29	struct device_node *pp;
	30	int nr_parts, i;
	31
628376fb DES	32
	33	if (!data)
	34	return 0;
	35
	36	node = data->of_node;
	37	if (!node)
	38	return 0;
	39
9a310d21 SW	40	/* First count the subnodes */
	41	pp = NULL;
	42	nr_parts = 0;
	43	while ((pp = of_get_next_child(node, pp)))
	44	nr_parts++;
	45
	46	if (nr_parts == 0)
	47	return 0;
	48
	49	pparts = kzalloc(nr_parts sizeof(**pparts), GFP_KERNEL);
	50	if (!*pparts)
	51	return -ENOMEM;
	52
	53	pp = NULL;
	54	i = 0;
	55	while ((pp = of_get_next_child(node, pp))) {
766f271a	56	const __be32 *reg;
9a310d21	57	int len;
05ff8c25	58	int a_cells, s_cells;
9a310d21	59
ebd5a74d BK	60	reg = of_get_property(pp, "reg", &len);
ebd5a74d BK	61	if (!reg) {
4b08e149 BK	62	nr_parts--;
	63	continue;
	64	}
	65
05ff8c25 JS	66	a_cells = of_n_addr_cells(pp);
	67	s_cells = of_n_size_cells(pp);
	68	(*pparts)[i].offset = of_read_number(reg, a_cells);
	69	(*pparts)[i].size = of_read_number(reg + a_cells, s_cells);
9a310d21 SW	70
	71	partname = of_get_property(pp, "label", &len);
	72	if (!partname)
	73	partname = of_get_property(pp, "name", &len);
	74	(pparts)[i].name = (char )partname;
	75
	76	if (of_get_property(pp, "read-only", &len))
ab0b00bc JR	77	(*pparts)[i].mask_flags \|= MTD_WRITEABLE;
	78
	79	if (of_get_property(pp, "lock", &len))
	80	(*pparts)[i].mask_flags \|= MTD_POWERUP_LOCK;
9a310d21 SW	81
	82	i++;
	83	}
	84
ebd5a74d BK	85	if (!i) {
ebd5a74d BK	86	of_node_put(pp);
d26c87d6	87	pr_err("No valid partition found on %s\n", node->full_name);
ebd5a74d BK	88	kfree(*pparts);
	89	*pparts = NULL;
	90	return -EINVAL;
	91	}
	92
9a310d21 SW	93	return nr_parts;
9a310d21 SW	94	}
950bcb25	95
d26c87d6 DES	96	static struct mtd_part_parser ofpart_parser = {
	97	.owner = THIS_MODULE,
	98	.parse_fn = parse_ofpart_partitions,
	99	.name = "ofpart",
	100	};
	101
fbcf62a3 DES	102	static int parse_ofoldpart_partitions(struct mtd_info *master,
	103	struct mtd_partition **pparts,
	104	struct mtd_part_parser_data *data)
	105	{
	106	struct device_node *dp;
	107	int i, plen, nr_parts;
	108	const struct {
	109	__be32 offset, len;
	110	} *part;
	111	const char *names;
	112
	113	if (!data)
	114	return 0;
	115
	116	dp = data->of_node;
	117	if (!dp)
	118	return 0;
	119
	120	part = of_get_property(dp, "partitions", &plen);
	121	if (!part)
	122	return 0; /* No partitions found */
	123
	124	pr_warning("Device tree uses obsolete partition map binding: %s\n",
	125	dp->full_name);
	126
	127	nr_parts = plen / sizeof(part[0]);
	128
	129	pparts = kzalloc(nr_parts sizeof((pparts)), GFP_KERNEL);
ecbcbc7b	130	if (!*pparts)
fbcf62a3 DES	131	return -ENOMEM;
	132
	133	names = of_get_property(dp, "partition-names", &plen);
	134
	135	for (i = 0; i < nr_parts; i++) {
	136	(*pparts)[i].offset = be32_to_cpu(part->offset);
	137	(*pparts)[i].size = be32_to_cpu(part->len) & ~1;
	138	/* bit 0 set signifies read only partition */
	139	if (be32_to_cpu(part->len) & 1)
	140	(*pparts)[i].mask_flags = MTD_WRITEABLE;
	141
	142	if (names && (plen > 0)) {
	143	int len = strlen(names) + 1;
	144
	145	(pparts)[i].name = (char )names;
	146	plen -= len;
	147	names += len;
	148	} else {
	149	(*pparts)[i].name = "unnamed";
	150	}
	151
	152	part++;
	153	}
	154
	155	return nr_parts;
	156	}
	157
	158	static struct mtd_part_parser ofoldpart_parser = {
	159	.owner = THIS_MODULE,
	160	.parse_fn = parse_ofoldpart_partitions,
	161	.name = "ofoldpart",
	162	};
	163
d26c87d6 DES	164	static int __init ofpart_parser_init(void)
d26c87d6 DES	165	{
fbcf62a3 DES	166	int rc;
	167	rc = register_mtd_parser(&ofpart_parser);
	168	if (rc)
	169	goto out;
	170
	171	rc = register_mtd_parser(&ofoldpart_parser);
	172	if (!rc)
	173	return 0;
	174
	175	deregister_mtd_parser(&ofoldpart_parser);
	176	out:
	177	return rc;
d26c87d6 DES	178	}
d26c87d6 DES	179
422f3890 LR	180	static void __exit ofpart_parser_exit(void)
	181	{
	182	deregister_mtd_parser(&ofpart_parser);
	183	deregister_mtd_parser(&ofoldpart_parser);
	184	}
	185
d26c87d6	186	module_init(ofpart_parser_init);
422f3890	187	module_exit(ofpart_parser_exit);
d26c87d6	188
950bcb25	189	MODULE_LICENSE("GPL");
d6137bad DES	190	MODULE_DESCRIPTION("Parser for MTD partitioning information in device tree");
d6137bad DES	191	MODULE_AUTHOR("Vitaly Wool, David Gibson");
9786f6e6 DES	192	/*
	193	* When MTD core cannot find the requested parser, it tries to load the module
	194	* with the same name. Since we provide the ofoldpart parser, we should have
	195	* the corresponding alias.
	196	*/
	197	MODULE_ALIAS("ofoldpart");