target/linux/brcm63xx/files/drivers/mtd/maps/bcm963xx-flash.c

   1 /*
   2  * Copyright (C) 2006-2008  Florian Fainelli <florian@openwrt.org>
   3  *                          Mike Albon <malbon@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  18  */
  19
  20 #include <linux/init.h>
  21 #include <linux/kernel.h>
  22 #include <linux/mtd/map.h>
  23 #include <linux/mtd/mtd.h>
  24 #include <linux/mtd/partitions.h>
  25 #include <linux/vmalloc.h>
  26 #include <linux/platform_device.h>
  27
  28 #include <bcm_tag.h>
  29 #include <asm/io.h>
  30
  31 #define BUSWIDTH 2                     /* Buswidth */
  32 #define EXTENDED_SIZE 0xBFC00000       /* Extended flash address */
  33
  34 #define PFX KBUILD_MODNAME ": "
  35
  36 extern int parse_redboot_partitions(struct mtd_info *master, struct mtd_partition **pparts, unsigned long fis_origin);
  37 static struct mtd_partition *parsed_parts;
  38
  39 static struct mtd_info *bcm963xx_mtd_info;
  40
  41 static struct map_info bcm963xx_map = {
  42        .name            = "bcm963xx",
  43        .bankwidth       = BUSWIDTH,
  44 };
  45
  46 static int parse_cfe_partitions( struct mtd_info *master, struct mtd_partition **pparts)
  47 {
  48         int nrparts = 2, curpart = 0; /* CFE and NVRAM are always present. */
  49         struct bcm_tag *buf;
  50         struct mtd_partition *parts;
  51         int ret;
  52         size_t retlen;
  53         unsigned int rootfsaddr, kerneladdr, spareaddr;
  54         unsigned int rootfslen, kernellen, sparelen, totallen;
  55         int namelen = 0;
  56         int i;
  57
  58         /* Allocate memory for buffer */
  59         buf = vmalloc(sizeof(struct bcm_tag));
  60         if (!buf)
  61                 return -ENOMEM;
  62
  63         /* Get the tag */
  64         ret = master->read(master,master->erasesize,sizeof(struct bcm_tag), &retlen, (void *)buf);
  65         if (retlen != sizeof(struct bcm_tag)){
  66                 vfree(buf);
  67                 return -EIO;
  68         }
  69         printk(KERN_INFO PFX "CFE boot tag found with version %s and board type %s.\n",buf->tagVersion,buf->boardid);
  70
  71         /* Get the values and calculate */
  72         sscanf(buf->rootAddress,"%u", &rootfsaddr);
  73         rootfsaddr = rootfsaddr - EXTENDED_SIZE;
  74         sscanf(buf->rootLength, "%u", &rootfslen);
  75         sscanf(buf->kernelAddress, "%u", &kerneladdr);
  76         kerneladdr = kerneladdr - EXTENDED_SIZE;
  77         sscanf(buf->kernelLength, "%u", &kernellen);
  78         sscanf(buf->totalLength, "%u", &totallen);
  79         spareaddr = roundup(totallen,master->erasesize) + master->erasesize;
  80         sparelen = master->size - spareaddr - master->erasesize;
  81
  82         /* Determine number of partitions */
  83         namelen = 8;
  84         if (rootfslen > 0){
  85                 nrparts++;
  86                 namelen =+ 6;
  87         };
  88         if (kernellen > 0) {
  89                 nrparts++;
  90                 namelen =+ 6;
  91         };
  92
  93         /* Ask kernel for more memory */
  94         parts = kzalloc(sizeof(*parts) * nrparts + 10 * nrparts, GFP_KERNEL);
  95         if (!parts) {
  96                 vfree(buf);
  97                 return -ENOMEM;
  98         };
  99
 100         /* Start building partition list */
 101         parts[curpart].name = "CFE";
 102         parts[curpart].offset = 0;
 103         parts[curpart].size = master->erasesize;
 104         curpart++;
 105
 106         if (kernellen > 0) {
 107                 parts[curpart].name = "kernel";
 108                 parts[curpart].offset = kerneladdr;
 109                 parts[curpart].size = kernellen;
 110                 curpart++;
 111         };
 112
 113         if (rootfslen > 0) {
 114                 parts[curpart].name = "rootfs";
 115                 parts[curpart].offset = rootfsaddr;
 116                 parts[curpart].size = rootfslen;
 117                 if (sparelen > 0)
 118                         parts[curpart].size += sparelen;
 119                 curpart++;
 120         };
 121         parts[curpart].name = "nvram";
 122         parts[curpart].offset = master->size - master->erasesize;
 123         parts[curpart].size = master->erasesize;
 124
 125         for (i = 0; i < nrparts; i++)
 126                 printk(KERN_INFO PFX "Partition %d is %s offset %x and length %x\n", i, parts[i].name, parts[i].offset, parts[i].size);
 127
 128         *pparts = parts;
 129         vfree(buf);
 130
 131         return nrparts;
 132 };
 133
 134 static int bcm963xx_detect_cfe(struct mtd_info *master)
 135 {
 136         int idoffset = 0x4e0;
 137         static char idstring[8] = "CFE1CFE1";
 138         char buf[9];
 139         int ret;
 140         size_t retlen;
 141
 142         ret = master->read(master, idoffset, 8, &retlen, (void *)buf);
 143         buf[retlen] = 0;
 144         printk(KERN_INFO PFX "Read Signature value of %s\n", buf);
 145
 146         return strncmp(idstring, buf, 8);
 147 }
 148
 149 static int bcm963xx_probe(struct platform_device *pdev)
 150 {
 151         int err = 0;
 152         int parsed_nr_parts = 0;
 153         char *part_type;
 154         struct resource *r;
 155
 156         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 157         bcm963xx_map.phys = r->start;
 158         bcm963xx_map.size = (r->end - r->start);
 159         bcm963xx_map.virt = ioremap(r->start, r->end - r->start + 1);
 160
 161         if (!bcm963xx_map.virt) {
 162                 printk(KERN_ERR PFX "Failed to ioremap\n");
 163                 return -EIO;
 164         }
 165         printk(KERN_INFO PFX "0x%08x at 0x%08x\n", bcm963xx_map.size, bcm963xx_map.phys);
 166
 167         simple_map_init(&bcm963xx_map);
 168
 169         bcm963xx_mtd_info = do_map_probe("cfi_probe", &bcm963xx_map);
 170         if (!bcm963xx_mtd_info) {
 171                 printk(KERN_ERR PFX "Failed to probe using CFI\n");
 172                 err = -EIO;
 173                 goto err_probe;
 174         }
 175
 176         bcm963xx_mtd_info->owner = THIS_MODULE;
 177
 178         /* This is mutually exclusive */
 179         if (bcm963xx_detect_cfe(bcm963xx_mtd_info) == 0) {
 180                 printk(KERN_INFO PFX "CFE bootloader detected\n");
 181                 if (parsed_nr_parts == 0) {
 182                         int ret = parse_cfe_partitions(bcm963xx_mtd_info, &parsed_parts);
 183                         if (ret > 0) {
 184                                 part_type = "CFE";
 185                                 parsed_nr_parts = ret;
 186                         }
 187                 }
 188         } else {
 189                 printk(KERN_INFO PFX "assuming RedBoot bootloader\n");
 190                 if (bcm963xx_mtd_info->size > 0x00400000) {
 191                         printk(KERN_INFO PFX "Support for extended flash memory size : 0x%08X ; ONLY 64MBIT SUPPORT\n", bcm963xx_mtd_info->size);
 192                         bcm963xx_map.virt = (u32)(EXTENDED_SIZE);
 193                 }
 194
 195 #ifdef CONFIG_MTD_REDBOOT_PARTS
 196                 if (parsed_nr_parts == 0) {
 197                         int ret = parse_redboot_partitions(bcm963xx_mtd_info, &parsed_parts, 0);
 198                         if (ret > 0) {
 199                                 part_type = "RedBoot";
 200                                 parsed_nr_parts = ret;
 201                         }
 202                 }
 203 #endif
 204         }
 205
 206         return add_mtd_partitions(bcm963xx_mtd_info, parsed_parts, parsed_nr_parts);
 207
 208 err_probe:
 209         iounmap(bcm963xx_map.virt);
 210         return err;
 211 }
 212
 213 static int bcm963xx_remove(struct platform_device *pdev)
 214 {
 215         if (bcm963xx_mtd_info) {
 216                 del_mtd_partitions(bcm963xx_mtd_info);
 217                 map_destroy(bcm963xx_mtd_info);
 218         }
 219
 220         if (bcm963xx_map.virt) {
 221                 iounmap(bcm963xx_map.virt);
 222                 bcm963xx_map.virt = 0;
 223         }
 224
 225         return 0;
 226 }
 227
 228 static struct platform_driver bcm63xx_mtd_dev = {
 229         .probe  = bcm963xx_probe,
 230         .remove = bcm963xx_remove,
 231         .driver = {
 232                 .name   = "bcm963xx-flash",
 233                 .owner  = THIS_MODULE,
 234         },
 235 };
 236
 237 static int __init bcm963xx_mtd_init(void)
 238 {
 239         return platform_driver_register(&bcm63xx_mtd_dev);
 240 }
 241
 242 static void __exit bcm963xx_mtd_exit(void)
 243 {
 244         platform_driver_unregister(&bcm63xx_mtd_dev);
 245 }
 246
 247 module_init(bcm963xx_mtd_init);
 248 module_exit(bcm963xx_mtd_exit);
 249
 250 MODULE_LICENSE("GPL");
 251 MODULE_DESCRIPTION("Broadcom BCM63xx MTD partition parser/mapping for CFE and RedBoot");
 252 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
 253 MODULE_AUTHOR("Mike Albon <malbon@openwrt.org>");