drivers/mtd/maps/bcm963xx-flash.c

   1 /*
   2  * Copyright © 2006-2008  Florian Fainelli <florian@openwrt.org>
   3  *                        Mike Albon <malbon@openwrt.org>
   4  * Copyright © 2009-2010  Daniel Dickinson <openwrt@cshore.neomailbox.net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  */
  20
  21 #include <linux/init.h>
  22 #include <linux/kernel.h>
  23 #include <linux/slab.h>
  24 #include <linux/mtd/map.h>
  25 #include <linux/mtd/mtd.h>
  26 #include <linux/mtd/partitions.h>
  27 #include <linux/vmalloc.h>
  28 #include <linux/platform_device.h>
  29 #include <linux/io.h>
  30
  31 #include <asm/mach-bcm63xx/bcm963xx_tag.h>
  32
  33 #define BCM63XX_BUSWIDTH        2               /* Buswidth */
  34 #define BCM63XX_EXTENDED_SIZE   0xBFC00000      /* Extended flash address */
  35
  36 #define PFX KBUILD_MODNAME ": "
  37
  38 static struct mtd_partition *parsed_parts;
  39
  40 static struct mtd_info *bcm963xx_mtd_info;
  41
  42 static struct map_info bcm963xx_map = {
  43         .name           = "bcm963xx",
  44         .bankwidth      = BCM63XX_BUSWIDTH,
  45 };
  46
  47 static int parse_cfe_partitions(struct mtd_info *master,
  48                                                 struct mtd_partition **pparts)
  49 {
  50         /* CFE, NVRAM and global Linux are always present */
  51         int nrparts = 3, curpart = 0;
  52         struct bcm_tag *buf;
  53         struct mtd_partition *parts;
  54         int ret;
  55         size_t retlen;
  56         unsigned int rootfsaddr, kerneladdr, spareaddr;
  57         unsigned int rootfslen, kernellen, sparelen, totallen;
  58         int namelen = 0;
  59         int i;
  60         char *boardid;
  61         char *tagversion;
  62
  63         /* Allocate memory for buffer */
  64         buf = vmalloc(sizeof(struct bcm_tag));
  65         if (!buf)
  66                 return -ENOMEM;
  67
  68         /* Get the tag */
  69         ret = master->read(master, master->erasesize, sizeof(struct bcm_tag),
  70                                                         &retlen, (void *)buf);
  71         if (retlen != sizeof(struct bcm_tag)) {
  72                 vfree(buf);
  73                 return -EIO;
  74         }
  75
  76         sscanf(buf->kernel_address, "%u", &kerneladdr);
  77         sscanf(buf->kernel_length, "%u", &kernellen);
  78         sscanf(buf->total_length, "%u", &totallen);
  79         tagversion = &(buf->tag_version[0]);
  80         boardid = &(buf->board_id[0]);
  81
  82         printk(KERN_INFO PFX "CFE boot tag found with version %s "
  83                                 "and board type %s\n", tagversion, boardid);
  84
  85         kerneladdr = kerneladdr - BCM63XX_EXTENDED_SIZE;
  86         rootfsaddr = kerneladdr + kernellen;
  87         spareaddr = roundup(totallen, master->erasesize) + master->erasesize;
  88         sparelen = master->size - spareaddr - master->erasesize;
  89         rootfslen = spareaddr - rootfsaddr;
  90
  91         /* Determine number of partitions */
  92         namelen = 8;
  93         if (rootfslen > 0) {
  94                 nrparts++;
  95                 namelen += 6;
  96         };
  97         if (kernellen > 0) {
  98                 nrparts++;
  99                 namelen += 6;
 100         };
 101
 102         /* Ask kernel for more memory */
 103         parts = kzalloc(sizeof(*parts) * nrparts + 10 * nrparts, GFP_KERNEL);
 104         if (!parts) {
 105                 vfree(buf);
 106                 return -ENOMEM;
 107         };
 108
 109         /* Start building partition list */
 110         parts[curpart].name = "CFE";
 111         parts[curpart].offset = 0;
 112         parts[curpart].size = master->erasesize;
 113         curpart++;
 114
 115         if (kernellen > 0) {
 116                 parts[curpart].name = "kernel";
 117                 parts[curpart].offset = kerneladdr;
 118                 parts[curpart].size = kernellen;
 119                 curpart++;
 120         };
 121
 122         if (rootfslen > 0) {
 123                 parts[curpart].name = "rootfs";
 124                 parts[curpart].offset = rootfsaddr;
 125                 parts[curpart].size = rootfslen;
 126                 if (sparelen > 0)
 127                         parts[curpart].size += sparelen;
 128                 curpart++;
 129         };
 130
 131         parts[curpart].name = "nvram";
 132         parts[curpart].offset = master->size - master->erasesize;
 133         parts[curpart].size = master->erasesize;
 134
 135         /* Global partition "linux" to make easy firmware upgrade */
 136         curpart++;
 137         parts[curpart].name = "linux";
 138         parts[curpart].offset = parts[0].size;
 139         parts[curpart].size = master->size - parts[0].size - parts[3].size;
 140
 141         for (i = 0; i < nrparts; i++)
 142                 printk(KERN_INFO PFX "Partition %d is %s offset %lx and "
 143                                         "length %lx\n", i, parts[i].name,
 144                                         (long unsigned int)(parts[i].offset),
 145                                         (long unsigned int)(parts[i].size));
 146
 147         printk(KERN_INFO PFX "Spare partition is %x offset and length %x\n",
 148                                                         spareaddr, sparelen);
 149         *pparts = parts;
 150         vfree(buf);
 151
 152         return nrparts;
 153 };
 154
 155 static int bcm963xx_detect_cfe(struct mtd_info *master)
 156 {
 157         int idoffset = 0x4e0;
 158         static char idstring[8] = "CFE1CFE1";
 159         char buf[9];
 160         int ret;
 161         size_t retlen;
 162
 163         ret = master->read(master, idoffset, 8, &retlen, (void *)buf);
 164         buf[retlen] = 0;
 165         printk(KERN_INFO PFX "Read Signature value of %s\n", buf);
 166
 167         return strncmp(idstring, buf, 8);
 168 }
 169
 170 static int bcm963xx_probe(struct platform_device *pdev)
 171 {
 172         int err = 0;
 173         int parsed_nr_parts = 0;
 174         char *part_type;
 175         struct resource *r;
 176
 177         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 178         if (!r) {
 179                 dev_err(&pdev->dev, "no resource supplied\n");
 180                 return -ENODEV;
 181         }
 182
 183         bcm963xx_map.phys = r->start;
 184         bcm963xx_map.size = resource_size(r);
 185         bcm963xx_map.virt = ioremap(r->start, resource_size(r));
 186         if (!bcm963xx_map.virt) {
 187                 dev_err(&pdev->dev, "failed to ioremap\n");
 188                 return -EIO;
 189         }
 190
 191         dev_info(&pdev->dev, "0x%08lx at 0x%08x\n",
 192                                         bcm963xx_map.size, bcm963xx_map.phys);
 193
 194         simple_map_init(&bcm963xx_map);
 195
 196         bcm963xx_mtd_info = do_map_probe("cfi_probe", &bcm963xx_map);
 197         if (!bcm963xx_mtd_info) {
 198                 dev_err(&pdev->dev, "failed to probe using CFI\n");
 199                 err = -EIO;
 200                 goto err_probe;
 201         }
 202
 203         bcm963xx_mtd_info->owner = THIS_MODULE;
 204
 205         /* This is mutually exclusive */
 206         if (bcm963xx_detect_cfe(bcm963xx_mtd_info) == 0) {
 207                 dev_info(&pdev->dev, "CFE bootloader detected\n");
 208                 if (parsed_nr_parts == 0) {
 209                         int ret = parse_cfe_partitions(bcm963xx_mtd_info,
 210                                                         &parsed_parts);
 211                         if (ret > 0) {
 212                                 part_type = "CFE";
 213                                 parsed_nr_parts = ret;
 214                         }
 215                 }
 216         } else {
 217                 dev_info(&pdev->dev, "unsupported bootloader\n");
 218                 err = -ENODEV;
 219                 goto err_probe;
 220         }
 221
 222         return add_mtd_partitions(bcm963xx_mtd_info, parsed_parts,
 223                                                 parsed_nr_parts);
 224
 225 err_probe:
 226         iounmap(bcm963xx_map.virt);
 227         return err;
 228 }
 229
 230 static int bcm963xx_remove(struct platform_device *pdev)
 231 {
 232         if (bcm963xx_mtd_info) {
 233                 del_mtd_partitions(bcm963xx_mtd_info);
 234                 map_destroy(bcm963xx_mtd_info);
 235         }
 236
 237         if (bcm963xx_map.virt) {
 238                 iounmap(bcm963xx_map.virt);
 239                 bcm963xx_map.virt = 0;
 240         }
 241
 242         return 0;
 243 }
 244
 245 static struct platform_driver bcm63xx_mtd_dev = {
 246         .probe  = bcm963xx_probe,
 247         .remove = bcm963xx_remove,
 248         .driver = {
 249                 .name   = "bcm963xx-flash",
 250                 .owner  = THIS_MODULE,
 251         },
 252 };
 253
 254 static int __init bcm963xx_mtd_init(void)
 255 {
 256         return platform_driver_register(&bcm63xx_mtd_dev);
 257 }
 258
 259 static void __exit bcm963xx_mtd_exit(void)
 260 {
 261         platform_driver_unregister(&bcm63xx_mtd_dev);
 262 }
 263
 264 module_init(bcm963xx_mtd_init);
 265 module_exit(bcm963xx_mtd_exit);
 266
 267 MODULE_LICENSE("GPL");
 268 MODULE_DESCRIPTION("Broadcom BCM63xx MTD driver for CFE and RedBoot");
 269 MODULE_AUTHOR("Daniel Dickinson <openwrt@cshore.neomailbox.net>");
 270 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
 271 MODULE_AUTHOR("Mike Albon <malbon@openwrt.org>");