[deliverable/linux.git] / drivers / mtd / bcm63xxpart.c

/*
 * BCM63XX CFE image tag parser
 *
 * Copyright © 2006-2008  Florian Fainelli <florian@openwrt.org>
 *			  Mike Albon <malbon@openwrt.org>
 * Copyright © 2009-2010  Daniel Dickinson <openwrt@cshore.neomailbox.net>
 * Copyright © 2011-2012  Jonas Gorski <jonas.gorski@gmail.com>
 *
 * 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
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/crc32.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>

#include <asm/mach-bcm63xx/bcm963xx_tag.h>
#include <asm/mach-bcm63xx/board_bcm963xx.h>

#define BCM63XX_EXTENDED_SIZE	0xBFC00000	/* Extended flash address */

#define BCM63XX_MIN_CFE_SIZE	0x10000		/* always at least 64KiB */
#define BCM63XX_MIN_NVRAM_SIZE	0x10000		/* always at least 64KiB */

#define BCM63XX_CFE_MAGIC_OFFSET 0x4e0

static int bcm63xx_detect_cfe(struct mtd_info *master)
{
	char buf[9];
	int ret;
	size_t retlen;

	ret = mtd_read(master, BCM963XX_CFE_VERSION_OFFSET, 5, &retlen,
		       (void *)buf);
	buf[retlen] = 0;

	if (ret)
		return ret;

	if (strncmp("cfe-v", buf, 5) == 0)
		return 0;

	/* very old CFE's do not have the cfe-v string, so check for magic */
	ret = mtd_read(master, BCM63XX_CFE_MAGIC_OFFSET, 8, &retlen,
		       (void *)buf);
	buf[retlen] = 0;

	return strncmp("CFE1CFE1", buf, 8);
}

static int bcm63xx_parse_cfe_partitions(struct mtd_info *master,
					struct mtd_partition **pparts,
					struct mtd_part_parser_data *data)
{
	/* CFE, NVRAM and global Linux are always present */
	int nrparts = 3, curpart = 0;
	struct bcm_tag *buf;
	struct mtd_partition *parts;
	int ret;
	size_t retlen;
	unsigned int rootfsaddr, kerneladdr, spareaddr;
	unsigned int rootfslen, kernellen, sparelen, totallen;
	unsigned int cfelen, nvramlen;
	int namelen = 0;
	int i;
	u32 computed_crc;
	bool rootfs_first = false;

	if (bcm63xx_detect_cfe(master))
		return -EINVAL;

	cfelen = max_t(uint32_t, master->erasesize, BCM63XX_MIN_CFE_SIZE);
	nvramlen = max_t(uint32_t, master->erasesize, BCM63XX_MIN_NVRAM_SIZE);

	/* Allocate memory for buffer */
	buf = vmalloc(sizeof(struct bcm_tag));
	if (!buf)
		return -ENOMEM;

	/* Get the tag */
	ret = mtd_read(master, cfelen, sizeof(struct bcm_tag), &retlen,
		       (void *)buf);

	if (retlen != sizeof(struct bcm_tag)) {
		vfree(buf);
		return -EIO;
	}

	computed_crc = crc32_le(IMAGETAG_CRC_START, (u8 *)buf,
				offsetof(struct bcm_tag, header_crc));
	if (computed_crc == buf->header_crc) {
		char *boardid = &(buf->board_id[0]);
		char *tagversion = &(buf->tag_version[0]);

		sscanf(buf->flash_image_start, "%u", &rootfsaddr);
		sscanf(buf->kernel_address, "%u", &kerneladdr);
		sscanf(buf->kernel_length, "%u", &kernellen);
		sscanf(buf->total_length, "%u", &totallen);

		pr_info("CFE boot tag found with version %s and board type %s\n",
			tagversion, boardid);

		kerneladdr = kerneladdr - BCM63XX_EXTENDED_SIZE;
		rootfsaddr = rootfsaddr - BCM63XX_EXTENDED_SIZE;
		spareaddr = roundup(totallen, master->erasesize) + cfelen;
		sparelen = master->size - spareaddr - nvramlen;

		if (rootfsaddr < kerneladdr) {
			/* default Broadcom layout */
			rootfslen = kerneladdr - rootfsaddr;
			rootfs_first = true;
		} else {
			/* OpenWrt layout */
			rootfsaddr = kerneladdr + kernellen;
			rootfslen = spareaddr - rootfsaddr;
		}
	} else {
		pr_warn("CFE boot tag CRC invalid (expected %08x, actual %08x)\n",
			buf->header_crc, computed_crc);
		kernellen = 0;
		rootfslen = 0;
		rootfsaddr = 0;
		spareaddr = cfelen;
		sparelen = master->size - cfelen - nvramlen;
	}

	/* Determine number of partitions */
	namelen = 8;
	if (rootfslen > 0) {
		nrparts++;
		namelen += 6;
	}
	if (kernellen > 0) {
		nrparts++;
		namelen += 6;
	}

	/* Ask kernel for more memory */
	parts = kzalloc(sizeof(*parts) * nrparts + 10 * nrparts, GFP_KERNEL);
	if (!parts) {
		vfree(buf);
		return -ENOMEM;
	}

	/* Start building partition list */
	parts[curpart].name = "CFE";
	parts[curpart].offset = 0;
	parts[curpart].size = cfelen;
	curpart++;

	if (kernellen > 0) {
		int kernelpart = curpart;

		if (rootfslen > 0 && rootfs_first)
			kernelpart++;
		parts[kernelpart].name = "kernel";
		parts[kernelpart].offset = kerneladdr;
		parts[kernelpart].size = kernellen;
		curpart++;
	}

	if (rootfslen > 0) {
		int rootfspart = curpart;

		if (kernellen > 0 && rootfs_first)
			rootfspart--;
		parts[rootfspart].name = "rootfs";
		parts[rootfspart].offset = rootfsaddr;
		parts[rootfspart].size = rootfslen;
		if (sparelen > 0  && !rootfs_first)
			parts[rootfspart].size += sparelen;
		curpart++;
	}

	parts[curpart].name = "nvram";
	parts[curpart].offset = master->size - nvramlen;
	parts[curpart].size = nvramlen;

	/* Global partition "linux" to make easy firmware upgrade */
	curpart++;
	parts[curpart].name = "linux";
	parts[curpart].offset = cfelen;
	parts[curpart].size = master->size - cfelen - nvramlen;

	for (i = 0; i < nrparts; i++)
		pr_info("Partition %d is %s offset %lx and length %lx\n", i,
			parts[i].name, (long unsigned int)(parts[i].offset),
			(long unsigned int)(parts[i].size));

	pr_info("Spare partition is offset %x and length %x\n",	spareaddr,
		sparelen);

	*pparts = parts;
	vfree(buf);

	return nrparts;
};

static struct mtd_part_parser bcm63xx_cfe_parser = {
	.owner = THIS_MODULE,
	.parse_fn = bcm63xx_parse_cfe_partitions,
	.name = "bcm63xxpart",
};

static int __init bcm63xx_cfe_parser_init(void)
{
	return register_mtd_parser(&bcm63xx_cfe_parser);
}

static void __exit bcm63xx_cfe_parser_exit(void)
{
	deregister_mtd_parser(&bcm63xx_cfe_parser);
}

module_init(bcm63xx_cfe_parser_init);
module_exit(bcm63xx_cfe_parser_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Daniel Dickinson <openwrt@cshore.neomailbox.net>");
MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
MODULE_AUTHOR("Mike Albon <malbon@openwrt.org>");
MODULE_AUTHOR("Jonas Gorski <jonas.gorski@gmail.com");
MODULE_DESCRIPTION("MTD partitioning for BCM63XX CFE bootloaders");
Commit	Line	Data
70a3c167 JG	1	/*
	2	* BCM63XX CFE image tag parser
	3	*
	4	* Copyright © 2006-2008 Florian Fainelli <florian@openwrt.org>
	5	* Mike Albon <malbon@openwrt.org>
	6	* Copyright © 2009-2010 Daniel Dickinson <openwrt@cshore.neomailbox.net>
5329d67c	7	* Copyright © 2011-2012 Jonas Gorski <jonas.gorski@gmail.com>
70a3c167 JG	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License, or
	12	* (at your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to the Free Software
	21	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	22	*
	23	*/
	24
	25	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	26
f98872fc	27	#include <linux/crc32.h>
70a3c167 JG	28	#include <linux/module.h>
	29	#include <linux/kernel.h>
	30	#include <linux/slab.h>
	31	#include <linux/vmalloc.h>
	32	#include <linux/mtd/mtd.h>
	33	#include <linux/mtd/partitions.h>
	34
	35	#include <asm/mach-bcm63xx/bcm963xx_tag.h>
f2d9739b	36	#include <asm/mach-bcm63xx/board_bcm963xx.h>
70a3c167 JG	37
	38	#define BCM63XX_EXTENDED_SIZE 0xBFC00000 /* Extended flash address */
	39
678eb9bb JG	40	#define BCM63XX_MIN_CFE_SIZE 0x10000 /* always at least 64KiB */
	41	#define BCM63XX_MIN_NVRAM_SIZE 0x10000 /* always at least 64KiB */
	42
f2d9739b JG	43	#define BCM63XX_CFE_MAGIC_OFFSET 0x4e0
f2d9739b JG	44
70a3c167 JG	45	static int bcm63xx_detect_cfe(struct mtd_info *master)
70a3c167 JG	46	{
70a3c167 JG	47	char buf[9];
	48	int ret;
	49	size_t retlen;
	50
329ad399 AB	51	ret = mtd_read(master, BCM963XX_CFE_VERSION_OFFSET, 5, &retlen,
329ad399 AB	52	(void *)buf);
f2d9739b JG	53	buf[retlen] = 0;
	54
	55	if (ret)
	56	return ret;
	57
	58	if (strncmp("cfe-v", buf, 5) == 0)
	59	return 0;
	60
	61	/* very old CFE's do not have the cfe-v string, so check for magic */
329ad399 AB	62	ret = mtd_read(master, BCM63XX_CFE_MAGIC_OFFSET, 8, &retlen,
329ad399 AB	63	(void *)buf);
70a3c167	64	buf[retlen] = 0;
70a3c167	65
f2d9739b	66	return strncmp("CFE1CFE1", buf, 8);
70a3c167 JG	67	}
	68
	69	static int bcm63xx_parse_cfe_partitions(struct mtd_info *master,
	70	struct mtd_partition **pparts,
	71	struct mtd_part_parser_data *data)
	72	{
	73	/* CFE, NVRAM and global Linux are always present */
	74	int nrparts = 3, curpart = 0;
	75	struct bcm_tag *buf;
	76	struct mtd_partition *parts;
	77	int ret;
	78	size_t retlen;
	79	unsigned int rootfsaddr, kerneladdr, spareaddr;
	80	unsigned int rootfslen, kernellen, sparelen, totallen;
678eb9bb	81	unsigned int cfelen, nvramlen;
70a3c167 JG	82	int namelen = 0;
70a3c167 JG	83	int i;
f98872fc	84	u32 computed_crc;
5329d67c	85	bool rootfs_first = false;
70a3c167 JG	86
	87	if (bcm63xx_detect_cfe(master))
	88	return -EINVAL;
	89
678eb9bb JG	90	cfelen = max_t(uint32_t, master->erasesize, BCM63XX_MIN_CFE_SIZE);
	91	nvramlen = max_t(uint32_t, master->erasesize, BCM63XX_MIN_NVRAM_SIZE);
	92
70a3c167 JG	93	/* Allocate memory for buffer */
	94	buf = vmalloc(sizeof(struct bcm_tag));
	95	if (!buf)
	96	return -ENOMEM;
	97
	98	/* Get the tag */
329ad399 AB	99	ret = mtd_read(master, cfelen, sizeof(struct bcm_tag), &retlen,
329ad399 AB	100	(void *)buf);
678eb9bb	101
70a3c167 JG	102	if (retlen != sizeof(struct bcm_tag)) {
	103	vfree(buf);
	104	return -EIO;
	105	}
	106
f98872fc JG	107	computed_crc = crc32_le(IMAGETAG_CRC_START, (u8 *)buf,
	108	offsetof(struct bcm_tag, header_crc));
	109	if (computed_crc == buf->header_crc) {
	110	char *boardid = &(buf->board_id[0]);
	111	char *tagversion = &(buf->tag_version[0]);
	112
5329d67c	113	sscanf(buf->flash_image_start, "%u", &rootfsaddr);
f98872fc JG	114	sscanf(buf->kernel_address, "%u", &kerneladdr);
	115	sscanf(buf->kernel_length, "%u", &kernellen);
	116	sscanf(buf->total_length, "%u", &totallen);
	117
	118	pr_info("CFE boot tag found with version %s and board type %s\n",
	119	tagversion, boardid);
	120
	121	kerneladdr = kerneladdr - BCM63XX_EXTENDED_SIZE;
5329d67c	122	rootfsaddr = rootfsaddr - BCM63XX_EXTENDED_SIZE;
f98872fc JG	123	spareaddr = roundup(totallen, master->erasesize) + cfelen;
f98872fc JG	124	sparelen = master->size - spareaddr - nvramlen;
5329d67c JG	125
	126	if (rootfsaddr < kerneladdr) {
	127	/* default Broadcom layout */
	128	rootfslen = kerneladdr - rootfsaddr;
	129	rootfs_first = true;
	130	} else {
	131	/* OpenWrt layout */
	132	rootfsaddr = kerneladdr + kernellen;
	133	rootfslen = spareaddr - rootfsaddr;
	134	}
f98872fc JG	135	} else {
	136	pr_warn("CFE boot tag CRC invalid (expected %08x, actual %08x)\n",
	137	buf->header_crc, computed_crc);
	138	kernellen = 0;
	139	rootfslen = 0;
	140	rootfsaddr = 0;
	141	spareaddr = cfelen;
	142	sparelen = master->size - cfelen - nvramlen;
	143	}
70a3c167 JG	144
	145	/* Determine number of partitions */
	146	namelen = 8;
	147	if (rootfslen > 0) {
	148	nrparts++;
	149	namelen += 6;
	150	}
	151	if (kernellen > 0) {
	152	nrparts++;
	153	namelen += 6;
	154	}
	155
	156	/* Ask kernel for more memory */
	157	parts = kzalloc(sizeof(parts) nrparts + 10 * nrparts, GFP_KERNEL);
	158	if (!parts) {
	159	vfree(buf);
	160	return -ENOMEM;
	161	}
	162
	163	/* Start building partition list */
	164	parts[curpart].name = "CFE";
	165	parts[curpart].offset = 0;
678eb9bb	166	parts[curpart].size = cfelen;
70a3c167 JG	167	curpart++;
	168
	169	if (kernellen > 0) {
5329d67c JG	170	int kernelpart = curpart;
	171
	172	if (rootfslen > 0 && rootfs_first)
	173	kernelpart++;
	174	parts[kernelpart].name = "kernel";
	175	parts[kernelpart].offset = kerneladdr;
	176	parts[kernelpart].size = kernellen;
70a3c167 JG	177	curpart++;
	178	}
	179
	180	if (rootfslen > 0) {
5329d67c JG	181	int rootfspart = curpart;
	182
	183	if (kernellen > 0 && rootfs_first)
	184	rootfspart--;
	185	parts[rootfspart].name = "rootfs";
	186	parts[rootfspart].offset = rootfsaddr;
	187	parts[rootfspart].size = rootfslen;
	188	if (sparelen > 0 && !rootfs_first)
	189	parts[rootfspart].size += sparelen;
70a3c167 JG	190	curpart++;
	191	}
	192
	193	parts[curpart].name = "nvram";
678eb9bb JG	194	parts[curpart].offset = master->size - nvramlen;
678eb9bb JG	195	parts[curpart].size = nvramlen;
70a3c167 JG	196
	197	/* Global partition "linux" to make easy firmware upgrade */
	198	curpart++;
	199	parts[curpart].name = "linux";
327c62c5 JG	200	parts[curpart].offset = cfelen;
327c62c5 JG	201	parts[curpart].size = master->size - cfelen - nvramlen;
70a3c167 JG	202
	203	for (i = 0; i < nrparts; i++)
	204	pr_info("Partition %d is %s offset %lx and length %lx\n", i,
	205	parts[i].name, (long unsigned int)(parts[i].offset),
	206	(long unsigned int)(parts[i].size));
	207
	208	pr_info("Spare partition is offset %x and length %x\n", spareaddr,
	209	sparelen);
	210
	211	*pparts = parts;
	212	vfree(buf);
	213
	214	return nrparts;
	215	};
	216
	217	static struct mtd_part_parser bcm63xx_cfe_parser = {
	218	.owner = THIS_MODULE,
	219	.parse_fn = bcm63xx_parse_cfe_partitions,
	220	.name = "bcm63xxpart",
	221	};
	222
	223	static int __init bcm63xx_cfe_parser_init(void)
	224	{
	225	return register_mtd_parser(&bcm63xx_cfe_parser);
	226	}
	227
	228	static void __exit bcm63xx_cfe_parser_exit(void)
	229	{
	230	deregister_mtd_parser(&bcm63xx_cfe_parser);
	231	}
	232
	233	module_init(bcm63xx_cfe_parser_init);
	234	module_exit(bcm63xx_cfe_parser_exit);
	235
	236	MODULE_LICENSE("GPL");
	237	MODULE_AUTHOR("Daniel Dickinson <openwrt@cshore.neomailbox.net>");
	238	MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
	239	MODULE_AUTHOR("Mike Albon <malbon@openwrt.org>");
	240	MODULE_AUTHOR("Jonas Gorski <jonas.gorski@gmail.com");
	241	MODULE_DESCRIPTION("MTD partitioning for BCM63XX CFE bootloaders");