treewide: fix replace nbd@openwrt.org with nbd@nbd.name
[openwrt.org/openwrt.git] / target / linux / ar71xx / files / drivers / mtd / cybertan_part.c
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/*
 * Copyright (C) 2009 Christian Daniel <cd@maintech.de>
 * Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.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
 *
 * TRX flash partition table.
 * Based on ar7 map by Felix Fietkau <nbd@nbd.name>
 *
 */
 
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
 
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
 
struct cybertan_header {
        char    magic[4];
        u8      res1[4];
        char    fw_date[3];
        char    fw_ver[3];
        char    id[4];
        char    hw_ver;
        char    unused;
        u8      flags[2];
        u8      res2[10];
};
 
#define TRX_PARTS       6
#define TRX_MAGIC       0x30524448
#define TRX_MAX_OFFSET  3
 
struct trx_header {
        uint32_t magic;           /* "HDR0" */
        uint32_t len;             /* Length of file including header */
        uint32_t crc32;           /* 32-bit CRC from flag_version to end of file */
        uint32_t flag_version;    /* 0:15 flags, 16:31 version */
        uint32_t offsets[TRX_MAX_OFFSET]; /* Offsets of partitions from start of header */
};
 
#define IH_MAGIC        0x27051956      /* Image Magic Number */
#define IH_NMLEN        32              /* Image Name Length */
 
struct uimage_header {
        uint32_t        ih_magic;       /* Image Header Magic Number */
        uint32_t        ih_hcrc;        /* Image Header CRC Checksum */
        uint32_t        ih_time;        /* Image Creation Timestamp */
        uint32_t        ih_size;        /* Image Data Size */
        uint32_t        ih_load;        /* Data» Load  Address */
        uint32_t        ih_ep;          /* Entry Point Address */
        uint32_t        ih_dcrc;        /* Image Data CRC Checksum */
        uint8_t         ih_os;          /* Operating System */
        uint8_t         ih_arch;        /* CPU architecture */
        uint8_t         ih_type;        /* Image Type */
        uint8_t         ih_comp;        /* Compression Type */
        uint8_t         ih_name[IH_NMLEN];      /* Image Name */
};
 
struct firmware_header {
        struct cybertan_header  cybertan;
        struct trx_header       trx;
        struct uimage_header    uimage;
} __packed;
 
#define UBOOT_LEN       0x40000
#define ART_LEN         0x10000
#define NVRAM_LEN       0x10000
 
static int cybertan_parse_partitions(struct mtd_info *master,
                                     struct mtd_partition **pparts,
                                     struct mtd_part_parser_data *data)
{
        struct firmware_header *header;
        struct trx_header *theader;
        struct uimage_header *uheader;
        struct mtd_partition *trx_parts;
        size_t retlen;
        unsigned int kernel_len;
        unsigned int uboot_len;
        unsigned int nvram_len;
        unsigned int art_len;
        int ret;
 
        uboot_len = max_t(unsigned int, master->erasesize, UBOOT_LEN);
        nvram_len = max_t(unsigned int, master->erasesize, NVRAM_LEN);
        art_len = max_t(unsigned int, master->erasesize, ART_LEN);
 
        trx_parts = kzalloc(TRX_PARTS * sizeof(struct mtd_partition),
                            GFP_KERNEL);
        if (!trx_parts) {
                ret = -ENOMEM;
                goto out;
        }
 
        header = vmalloc(sizeof(*header));
        if (!header) {
                return -ENOMEM;
                goto free_parts;
        }
 
        ret = mtd_read(master, uboot_len, sizeof(*header),
                       &retlen, (void *) header);
        if (ret)
                goto free_hdr;
 
        if (retlen != sizeof(*header)) {
                ret = -EIO;
                goto free_hdr;
        }
 
        theader = &header->trx;
        if (le32_to_cpu(theader->magic) != TRX_MAGIC) {
                printk(KERN_NOTICE "%s: no TRX header found\n", master->name);
                goto free_hdr;
        }
 
        uheader = &header->uimage;
        if (uheader->ih_magic != IH_MAGIC) {
                printk(KERN_NOTICE "%s: no uImage found\n", master->name);
                goto free_hdr;
        }
 
        kernel_len = le32_to_cpu(theader->offsets[1]) +
                sizeof(struct cybertan_header);
 
        trx_parts[0].name = "u-boot";
        trx_parts[0].offset = 0;
        trx_parts[0].size = uboot_len;
        trx_parts[0].mask_flags = MTD_WRITEABLE;
 
        trx_parts[1].name = "kernel";
        trx_parts[1].offset = trx_parts[0].offset + trx_parts[0].size;
        trx_parts[1].size = kernel_len;
        trx_parts[1].mask_flags = 0;
 
        trx_parts[2].name = "rootfs";
        trx_parts[2].offset = trx_parts[1].offset + trx_parts[1].size;
        trx_parts[2].size = master->size - uboot_len - nvram_len - art_len -
                trx_parts[1].size;
        trx_parts[2].mask_flags = 0;
 
        trx_parts[3].name = "nvram";
        trx_parts[3].offset = master->size - nvram_len - art_len;
        trx_parts[3].size = nvram_len;
        trx_parts[3].mask_flags = MTD_WRITEABLE;
 
        trx_parts[4].name = "art";
        trx_parts[4].offset = master->size - art_len;
        trx_parts[4].size = art_len;
        trx_parts[4].mask_flags = MTD_WRITEABLE;
 
        trx_parts[5].name = "firmware";
        trx_parts[5].offset = uboot_len;
        trx_parts[5].size = master->size - uboot_len - nvram_len - art_len;
        trx_parts[5].mask_flags = 0;
 
        vfree(header);
 
        *pparts = trx_parts;
        return TRX_PARTS;
 
free_hdr:
        vfree(header);
free_parts:
        kfree(trx_parts);
out:
        return ret;
}
 
static struct mtd_part_parser cybertan_parser = {
        .owner          = THIS_MODULE,
        .parse_fn       = cybertan_parse_partitions,
        .name           = "cybertan",
};
 
static int __init cybertan_parser_init(void)
{
        register_mtd_parser(&cybertan_parser);
 
        return 0;
}
 
module_init(cybertan_parser_init);
 
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Christian Daniel <cd@maintech.de>");
 
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