Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / mtd / ar7part.c

diff --git a/kernel/drivers/mtd/ar7part.c b/kernel/drivers/mtd/ar7part.c
new file mode 100644 (file)
index 0000000..7c9172a
--- /dev/null
+++ b/kernel/drivers/mtd/ar7part.c
@@ -0,0 +1,157 @@
+/*
+ * Copyright © 2007 Eugene Konev <ejka@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
+ *
+ * TI AR7 flash partition table.
+ * Based on ar7 map by Felix Fietkau <nbd@openwrt.org>
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+#include <linux/bootmem.h>
+#include <linux/module.h>
+
+#include <uapi/linux/magic.h>
+
+#define AR7_PARTS      4
+#define ROOT_OFFSET    0xe0000
+
+#define LOADER_MAGIC1  le32_to_cpu(0xfeedfa42)
+#define LOADER_MAGIC2  le32_to_cpu(0xfeed1281)
+
+struct ar7_bin_rec {
+       unsigned int checksum;
+       unsigned int length;
+       unsigned int address;
+};
+
+static int create_mtd_partitions(struct mtd_info *master,
+                                struct mtd_partition **pparts,
+                                struct mtd_part_parser_data *data)
+{
+       struct ar7_bin_rec header;
+       unsigned int offset;
+       size_t len;
+       unsigned int pre_size = master->erasesize, post_size = 0;
+       unsigned int root_offset = ROOT_OFFSET;
+
+       int retries = 10;
+       struct mtd_partition *ar7_parts;
+
+       ar7_parts = kzalloc(sizeof(*ar7_parts) * AR7_PARTS, GFP_KERNEL);
+       if (!ar7_parts)
+               return -ENOMEM;
+       ar7_parts[0].name = "loader";
+       ar7_parts[0].offset = 0;
+       ar7_parts[0].size = master->erasesize;
+       ar7_parts[0].mask_flags = MTD_WRITEABLE;
+
+       ar7_parts[1].name = "config";
+       ar7_parts[1].offset = 0;
+       ar7_parts[1].size = master->erasesize;
+       ar7_parts[1].mask_flags = 0;
+
+       do { /* Try 10 blocks starting from master->erasesize */
+               offset = pre_size;
+               mtd_read(master, offset, sizeof(header), &len,
+                        (uint8_t *)&header);
+               if (!strncmp((char *)&header, "TIENV0.8", 8))
+                       ar7_parts[1].offset = pre_size;
+               if (header.checksum == LOADER_MAGIC1)
+                       break;
+               if (header.checksum == LOADER_MAGIC2)
+                       break;
+               pre_size += master->erasesize;
+       } while (retries--);
+
+       pre_size = offset;
+
+       if (!ar7_parts[1].offset) {
+               ar7_parts[1].offset = master->size - master->erasesize;
+               post_size = master->erasesize;
+       }
+
+       switch (header.checksum) {
+       case LOADER_MAGIC1:
+               while (header.length) {
+                       offset += sizeof(header) + header.length;
+                       mtd_read(master, offset, sizeof(header), &len,
+                                (uint8_t *)&header);
+               }
+               root_offset = offset + sizeof(header) + 4;
+               break;
+       case LOADER_MAGIC2:
+               while (header.length) {
+                       offset += sizeof(header) + header.length;
+                       mtd_read(master, offset, sizeof(header), &len,
+                                (uint8_t *)&header);
+               }
+               root_offset = offset + sizeof(header) + 4 + 0xff;
+               root_offset &= ~(uint32_t)0xff;
+               break;
+       default:
+               printk(KERN_WARNING "Unknown magic: %08x\n", header.checksum);
+               break;
+       }
+
+       mtd_read(master, root_offset, sizeof(header), &len, (u8 *)&header);
+       if (header.checksum != SQUASHFS_MAGIC) {
+               root_offset += master->erasesize - 1;
+               root_offset &= ~(master->erasesize - 1);
+       }
+
+       ar7_parts[2].name = "linux";
+       ar7_parts[2].offset = pre_size;
+       ar7_parts[2].size = master->size - pre_size - post_size;
+       ar7_parts[2].mask_flags = 0;
+
+       ar7_parts[3].name = "rootfs";
+       ar7_parts[3].offset = root_offset;
+       ar7_parts[3].size = master->size - root_offset - post_size;
+       ar7_parts[3].mask_flags = 0;
+
+       *pparts = ar7_parts;
+       return AR7_PARTS;
+}
+
+static struct mtd_part_parser ar7_parser = {
+       .owner = THIS_MODULE,
+       .parse_fn = create_mtd_partitions,
+       .name = "ar7part",
+};
+
+static int __init ar7_parser_init(void)
+{
+       register_mtd_parser(&ar7_parser);
+       return 0;
+}
+
+static void __exit ar7_parser_exit(void)
+{
+       deregister_mtd_parser(&ar7_parser);
+}
+
+module_init(ar7_parser_init);
+module_exit(ar7_parser_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR( "Felix Fietkau <nbd@openwrt.org>, "
+               "Eugene Konev <ejka@openwrt.org>");
+MODULE_DESCRIPTION("MTD partitioning for TI AR7");