kernel: move mtdsplit files to drivers/mtd/mtdsplit/ to simplify maintenance, unify...

[15.05/openwrt.git] / target / linux / generic / files / drivers / mtd / mtdsplit / mtdsplit_seama.c

diff --git a/target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_seama.c b/target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_seama.c
new file mode 100644 (file)
index 0000000..6f21f8f
--- /dev/null
+++ b/target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_seama.c
@@ -0,0 +1,103 @@
+/*
+ *  Copyright (C) 2013 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 version 2 as published
+ *  by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+#include <linux/byteorder/generic.h>
+
+#include "mtdsplit.h"
+
+#define SEAMA_MAGIC            0x5EA3A417
+#define SEAMA_NR_PARTS         2
+#define SEAMA_MIN_ROOTFS_OFFS  0x80000 /* 512KiB */
+
+struct seama_header {
+       __be32  magic;          /* should always be SEAMA_MAGIC. */
+       __be16  reserved;       /* reserved for  */
+       __be16  metasize;       /* size of the META data */
+       __be32  size;           /* size of the image */
+};
+
+static int mtdsplit_parse_seama(struct mtd_info *master,
+                               struct mtd_partition **pparts,
+                               struct mtd_part_parser_data *data)
+{
+       struct seama_header hdr;
+       size_t hdr_len, retlen, kernel_size;
+       size_t rootfs_offset;
+       struct mtd_partition *parts;
+       int err;
+
+       hdr_len = sizeof(hdr);
+       err = mtd_read(master, 0, hdr_len, &retlen, (void *) &hdr);
+       if (err)
+               return err;
+
+       if (retlen != hdr_len)
+               return -EIO;
+
+       /* sanity checks */
+       if (be32_to_cpu(hdr.magic) != SEAMA_MAGIC)
+               return -EINVAL;
+
+       kernel_size = hdr_len + be32_to_cpu(hdr.size) +
+                     be16_to_cpu(hdr.metasize);
+       if (kernel_size > master->size)
+               return -EINVAL;
+
+       /* Find the rootfs after the kernel. */
+       err = mtd_check_rootfs_magic(master, kernel_size);
+       if (!err) {
+               rootfs_offset = kernel_size;
+       } else {
+               /*
+                * The size in the header might cover the rootfs as well.
+                * Start the search from an arbitrary offset.
+                */
+               err = mtd_find_rootfs_from(master, SEAMA_MIN_ROOTFS_OFFS,
+                                          master->size, &rootfs_offset);
+               if (err)
+                       return err;
+       }
+
+       parts = kzalloc(SEAMA_NR_PARTS * sizeof(*parts), GFP_KERNEL);
+       if (!parts)
+               return -ENOMEM;
+
+       parts[0].name = KERNEL_PART_NAME;
+       parts[0].offset = 0;
+       parts[0].size = rootfs_offset;
+
+       parts[1].name = ROOTFS_PART_NAME;
+       parts[1].offset = rootfs_offset;
+       parts[1].size = master->size - rootfs_offset;
+
+       *pparts = parts;
+       return SEAMA_NR_PARTS;
+}
+
+static struct mtd_part_parser mtdsplit_seama_parser = {
+       .owner = THIS_MODULE,
+       .name = "seama-fw",
+       .parse_fn = mtdsplit_parse_seama,
+       .type = MTD_PARSER_TYPE_FIRMWARE,
+};
+
+static int __init mtdsplit_seama_init(void)
+{
+       register_mtd_parser(&mtdsplit_seama_parser);
+
+       return 0;
+}
+
+subsys_initcall(mtdsplit_seama_init);