Initial commit

target/linux/ath79/files/drivers/mtd/parsers/parser_cybertan.c

@@ -0,0 +1,163 @@
+/*
+ * 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>
+#include <linux/version.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];
+} __packed;
+
+#define TRX_PARTS	3
+#define TRX_MAGIC	0x30524448
+#define TRX_MAX_OFFSET	3
+
+struct trx_header {
+	__le32 magic;           /* "HDR0" */
+	__le32 len;             /* Length of file including header */
+	__le32 crc32;           /* 32-bit CRC from flag_version to end of file */
+	__le32 flag_version;    /* 0:15 flags, 16:31 version */
+	__le32 offsets[TRX_MAX_OFFSET]; /* Offsets of partitions from start of header */
+} __packed;
+
+#define IH_MAGIC	0x27051956	/* Image Magic Number */
+#define IH_NMLEN	32		/* Image Name Length */
+
+struct uimage_header {
+	__be32	ih_magic;	/* Image Header Magic Number */
+	__be32	ih_hcrc;	/* Image Header CRC Checksum */
+	__be32	ih_time;	/* Image Creation Timestamp */
+	__be32	ih_size;	/* Image Data Size */
+	__be32	ih_load;	/* Data» Load  Address */
+	__be32	ih_ep;		/* Entry Point Address */
+	__be32	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 */
+} __packed;
+
+struct firmware_header {
+	struct cybertan_header	cybertan;
+	struct trx_header	trx;
+	struct uimage_header	uimage;
+} __packed;
+
+static int cybertan_parse_partitions(struct mtd_info *master,
+				     const 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;
+	int ret;
+
+	trx_parts = kcalloc(TRX_PARTS, sizeof(struct mtd_partition),
+			    GFP_KERNEL);
+	if (!trx_parts) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	ret = mtd_read(master, 0, sizeof(header),
+		       &retlen, (uint8_t *)&header);
+	if (ret)
+		goto free_parts;
+
+	if (retlen != sizeof(header)) {
+		ret = -EIO;
+		goto free_parts;
+	}
+
+	theader = &header.trx;
+	if (theader->magic != cpu_to_le32(TRX_MAGIC)) {
+		printk(KERN_NOTICE "%s: no TRX header found\n", master->name);
+		goto free_parts;
+	}
+
+	uheader = &header.uimage;
+	if (uheader->ih_magic != cpu_to_be32(IH_MAGIC)) {
+		printk(KERN_NOTICE "%s: no uImage found\n", master->name);
+		goto free_parts;
+	}
+
+	kernel_len = le32_to_cpu(theader->offsets[1]) +
+		sizeof(struct cybertan_header);
+
+	trx_parts[0].name = "header";
+	trx_parts[0].offset = 0;
+	trx_parts[0].size = offsetof(struct firmware_header, uimage);
+	trx_parts[0].mask_flags = 0;
+
+	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[0].size;
+	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 - trx_parts[1].size - trx_parts[0].size;
+	trx_parts[2].mask_flags = 0;
+
+	*pparts = trx_parts;
+	return TRX_PARTS;
+
+free_parts:
+	kfree(trx_parts);
+out:
+	return ret;
+}
+
+static const struct of_device_id mtd_parser_cybertan_of_match_table[] = {
+	{ .compatible = "cybertan,trx" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, mtd_parser_cybertan_of_match_table);
+
+static struct mtd_part_parser mtd_parser_cybertan = {
+	.parse_fn = cybertan_parse_partitions,
+	.name = "cybertan-trx",
+	.of_match_table = mtd_parser_cybertan_of_match_table,
+};
+module_mtd_part_parser(mtd_parser_cybertan);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Christian Daniel <cd@maintech.de>");