mtd: add Broadcom BCM63xx image tag partition parser

This patch adds support for parsing Broadcom BCM63xx image tag format and
creating MTD partitions accordingly. This driver is a platform_device which
can be instantiated accordingly by bcm63xx board support code.

Signed-off-by: Daniel Dickinson <cshore@csolve.net>
Signed-off-by: Mike Albon <malbon@openwrt.org>
Signed-off-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

3 files changed, 281 insertions, 0 deletions

diff --git a/drivers/mtd/maps/Kconfig b/drivers/mtd/maps/Kconfig
index 701d942c6795..e5eb65cfb3eb 100644
--- a/drivers/mtd/maps/Kconfig
+++ b/drivers/mtd/maps/Kconfig
@@ -251,6 +251,15 @@ config MTD_NETtel
         help
           Support for flash chips on NETtel/SecureEdge/SnapGear boards.
 
+config MTD_BCM963XX
+        tristate "Map driver for Broadcom BCM963xx boards"
+        depends on BCM63XX
+        select MTD_MAP_BANK_WIDTH_2
+        select MTD_CFI_I1
+        help
+          Support for parsing CFE image tag and creating MTD partitions on
+          Broadcom BCM63xx boards.
+
 config MTD_DILNETPC
         tristate "CFI Flash device mapped on DIL/Net PC"
         depends on X86 && MTD_CONCAT && MTD_PARTITIONS && MTD_CFI_INTELEXT && BROKEN
diff --git a/drivers/mtd/maps/Makefile b/drivers/mtd/maps/Makefile
index f216bb573713..c7869c7a6b18 100644
--- a/drivers/mtd/maps/Makefile
+++ b/drivers/mtd/maps/Makefile
@@ -58,3 +58,4 @@ obj-$(CONFIG_MTD_BFIN_ASYNC)	+= bfin-async-flash.o
 obj-$(CONFIG_MTD_RBTX4939)      += rbtx4939-flash.o
 obj-$(CONFIG_MTD_VMU)           += vmu-flash.o
 obj-$(CONFIG_MTD_GPIO_ADDR)     += gpio-addr-flash.o
+obj-$(CONFIG_MTD_BCM963XX)      += bcm963xx-flash.o
diff --git a/drivers/mtd/maps/bcm963xx-flash.c b/drivers/mtd/maps/bcm963xx-flash.c
new file mode 100644
index 000000000000..d175c120ee84
--- /dev/null
+++ b/drivers/mtd/maps/bcm963xx-flash.c
@@ -0,0 +1,271 @@
+/*
+ * Copyright © 2006-2008  Florian Fainelli <florian@openwrt.org>
+ *                        Mike Albon <malbon@openwrt.org>
+ * Copyright © 2009-2010  Daniel Dickinson <openwrt@cshore.neomailbox.net>
+ *
+ * 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
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+#include <linux/vmalloc.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+
+#include <asm/mach-bcm63xx/bcm963xx_tag.h>
+
+#define BCM63XX_BUSWIDTH        2               /* Buswidth */
+#define BCM63XX_EXTENDED_SIZE   0xBFC00000      /* Extended flash address */
+
+#define PFX KBUILD_MODNAME ": "
+
+static struct mtd_partition *parsed_parts;
+
+static struct mtd_info *bcm963xx_mtd_info;
+
+static struct map_info bcm963xx_map = {
+        .name           = "bcm963xx",
+        .bankwidth      = BCM63XX_BUSWIDTH,
+};
+
+static int parse_cfe_partitions(struct mtd_info *master,
+                                                struct mtd_partition **pparts)
+{
+        /* 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;
+
+        /* 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]);
+
+        printk(KERN_INFO PFX "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++)
+                printk(KERN_INFO PFX "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));
+
+        printk(KERN_INFO PFX "Spare partition is %x offset and length %x\n",
+                                                        spareaddr, sparelen);
+        *pparts = parts;
+        vfree(buf);
+
+        return nrparts;
+};
+
+static int bcm963xx_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;
+        printk(KERN_INFO PFX "Read Signature value of %s\n", buf);
+
+        return strncmp(idstring, buf, 8);
+}
+
+static int bcm963xx_probe(struct platform_device *pdev)
+{
+        int err = 0;
+        int parsed_nr_parts = 0;
+        char *part_type;
+        struct resource *r;
+
+        r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!r) {
+                dev_err(&pdev->dev, "no resource supplied\n");
+                return -ENODEV;
+        }
+
+        bcm963xx_map.phys = r->start;
+        bcm963xx_map.size = resource_size(r);
+        bcm963xx_map.virt = ioremap(r->start, resource_size(r));
+        if (!bcm963xx_map.virt) {
+                dev_err(&pdev->dev, "failed to ioremap\n");
+                return -EIO;
+        }
+
+        dev_info(&pdev->dev, "0x%08lx at 0x%08x\n",
+                                        bcm963xx_map.size, bcm963xx_map.phys);
+
+        simple_map_init(&bcm963xx_map);
+
+        bcm963xx_mtd_info = do_map_probe("cfi_probe", &bcm963xx_map);
+        if (!bcm963xx_mtd_info) {
+                dev_err(&pdev->dev, "failed to probe using CFI\n");
+                err = -EIO;
+                goto err_probe;
+        }
+
+        bcm963xx_mtd_info->owner = THIS_MODULE;
+
+        /* This is mutually exclusive */
+        if (bcm963xx_detect_cfe(bcm963xx_mtd_info) == 0) {
+                dev_info(&pdev->dev, "CFE bootloader detected\n");
+                if (parsed_nr_parts == 0) {
+                        int ret = parse_cfe_partitions(bcm963xx_mtd_info,
+                                                        &parsed_parts);
+                        if (ret > 0) {
+                                part_type = "CFE";
+                                parsed_nr_parts = ret;
+                        }
+                }
+        } else {
+                dev_info(&pdev->dev, "unsupported bootloader\n");
+                err = -ENODEV;
+                goto err_probe;
+        }
+
+        return add_mtd_partitions(bcm963xx_mtd_info, parsed_parts,
+                                                parsed_nr_parts);
+
+err_probe:
+        iounmap(bcm963xx_map.virt);
+        return err;
+}
+
+static int bcm963xx_remove(struct platform_device *pdev)
+{
+        if (bcm963xx_mtd_info) {
+                del_mtd_partitions(bcm963xx_mtd_info);
+                map_destroy(bcm963xx_mtd_info);
+        }
+
+        if (bcm963xx_map.virt) {
+                iounmap(bcm963xx_map.virt);
+                bcm963xx_map.virt = 0;
+        }
+
+        return 0;
+}
+
+static struct platform_driver bcm63xx_mtd_dev = {
+        .probe  = bcm963xx_probe,
+        .remove = bcm963xx_remove,
+        .driver = {
+                .name   = "bcm963xx-flash",
+                .owner  = THIS_MODULE,
+        },
+};
+
+static int __init bcm963xx_mtd_init(void)
+{
+        return platform_driver_register(&bcm63xx_mtd_dev);
+}
+
+static void __exit bcm963xx_mtd_exit(void)
+{
+        platform_driver_unregister(&bcm63xx_mtd_dev);
+}
+
+module_init(bcm963xx_mtd_init);
+module_exit(bcm963xx_mtd_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Broadcom BCM63xx MTD driver for CFE and RedBoot");
+MODULE_AUTHOR("Daniel Dickinson <openwrt@cshore.neomailbox.net>");
+MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
+MODULE_AUTHOR("Mike Albon <malbon@openwrt.org>");