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authorJonas Gorski <jonas.gorski@gmail.com>2011-12-05 19:08:08 +0400
committerDavid Woodhouse <David.Woodhouse@intel.com>2012-01-09 22:15:31 +0400
commit70a3c167c4bf38b5ffd07d8506230ecc20ef7ab1 (patch)
tree520c452c53100751d02e30bd105e633a8c3639f9 /drivers/mtd/bcm63xxpart.c
parentca105f4d9823f916a4718c4bc766fd14842056f2 (diff)
downloadlinux-70a3c167c4bf38b5ffd07d8506230ecc20ef7ab1.tar.xz
mtd: maps: bcm963xx-flash: make CFE partition parsing an mtd parser
Recent BCM63XX devices support a variety of flash types (parallel, SPI, NAND) and share the partition layout. To prevent code duplication make the CFE partition parsing code a stand alone mtd parser to allow SPI or NAND flash drivers to use it. Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com> Acked-by: Florian Fainelli <florian@openwrt.org> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@linux.intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/mtd/bcm63xxpart.c')
-rw-r--r--drivers/mtd/bcm63xxpart.c189
1 files changed, 189 insertions, 0 deletions
diff --git a/drivers/mtd/bcm63xxpart.c b/drivers/mtd/bcm63xxpart.c
new file mode 100644
index 000000000000..ac7d3c823949
--- /dev/null
+++ b/drivers/mtd/bcm63xxpart.c
@@ -0,0 +1,189 @@
+/*
+ * 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 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/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>
+
+#define BCM63XX_EXTENDED_SIZE 0xBFC00000 /* Extended flash address */
+
+static int bcm63xx_detect_cfe(struct mtd_info *master)
+{
+ int idoffset = 0x4e0;
+ static char idstring[8] = "CFE1CFE1";
+ char buf[9];
+ int ret;
+ size_t retlen;
+
+ ret = master->read(master, idoffset, 8, &retlen, (void *)buf);
+ buf[retlen] = 0;
+ pr_info("Read Signature value of %s\n", buf);
+
+ return strncmp(idstring, 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;
+ int namelen = 0;
+ int i;
+ char *boardid;
+ char *tagversion;
+
+ if (bcm63xx_detect_cfe(master))
+ return -EINVAL;
+
+ /* Allocate memory for buffer */
+ buf = vmalloc(sizeof(struct bcm_tag));
+ if (!buf)
+ return -ENOMEM;
+
+ /* Get the tag */
+ ret = master->read(master, master->erasesize, sizeof(struct bcm_tag),
+ &retlen, (void *)buf);
+ if (retlen != sizeof(struct bcm_tag)) {
+ vfree(buf);
+ return -EIO;
+ }
+
+ sscanf(buf->kernel_address, "%u", &kerneladdr);
+ sscanf(buf->kernel_length, "%u", &kernellen);
+ sscanf(buf->total_length, "%u", &totallen);
+ tagversion = &(buf->tag_version[0]);
+ boardid = &(buf->board_id[0]);
+
+ pr_info("CFE boot tag found with version %s and board type %s\n",
+ tagversion, boardid);
+
+ kerneladdr = kerneladdr - BCM63XX_EXTENDED_SIZE;
+ rootfsaddr = kerneladdr + kernellen;
+ spareaddr = roundup(totallen, master->erasesize) + master->erasesize;
+ sparelen = master->size - spareaddr - master->erasesize;
+ rootfslen = spareaddr - rootfsaddr;
+
+ /* 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 = master->erasesize;
+ curpart++;
+
+ if (kernellen > 0) {
+ parts[curpart].name = "kernel";
+ parts[curpart].offset = kerneladdr;
+ parts[curpart].size = kernellen;
+ curpart++;
+ }
+
+ if (rootfslen > 0) {
+ parts[curpart].name = "rootfs";
+ parts[curpart].offset = rootfsaddr;
+ parts[curpart].size = rootfslen;
+ if (sparelen > 0)
+ parts[curpart].size += sparelen;
+ curpart++;
+ }
+
+ parts[curpart].name = "nvram";
+ parts[curpart].offset = master->size - master->erasesize;
+ parts[curpart].size = master->erasesize;
+
+ /* Global partition "linux" to make easy firmware upgrade */
+ curpart++;
+ parts[curpart].name = "linux";
+ parts[curpart].offset = parts[0].size;
+ parts[curpart].size = master->size - parts[0].size - parts[3].size;
+
+ 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");