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

   1 /*
   2  * $Id$
   3  * Copyright (C) 2006  Florian Fainelli <florian@openwrt.org>
   4  *                      Mike Albon <malbon@openwrt.org>
   5  * Copyright (C) $Date$  $Author$
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  20  */
  21
  22 /* This is the BCM963xx flash map driver, in its actual state it only supports BCM96348 devices
  23  * this driver is able to manage both bootloader we found on these boards : CFE and RedBoot
  24  *
  25  * RedBoot :
  26  *  - this bootloader allows us to parse partitions and therefore deduce the MTD partition table
  27  *
  28  * CFE :
  29  *   - CFE partitionning can be detected as for BCM947xx devices
  30  *
  31  */
  32
  33 #include <linux/init.h>
  34 #include <linux/kernel.h>
  35 #include <linux/mtd/map.h>
  36 #include <linux/mtd/mtd.h>
  37 #include <linux/mtd/partitions.h>
  38 #include <linux/vmalloc.h>
  39
  40 #include <asm/io.h>
  41
  42 #define WINDOW_ADDR 0x1FC00000         /* Real address of the flash */
  43 #define WINDOW_SIZE 0x400000           /* Size of flash */
  44 #define BUSWIDTH 2                     /* Buswidth */
  45 #define EXTENDED_SIZE 0xBFC00000       /* Extended flash address */
  46 #define IMAGE_LEN 10                   /* Length of Length Field */
  47 #define ADDRESS_LEN 12                 /* Length of Address field */
  48 #define ROUNDUP(x, y) ((((x)+((y)-1))/(y))*(y))
  49
  50 extern int boot_loader_type;           /* For RedBoot / CFE detection */
  51 extern int parse_redboot_partitions(struct mtd_info *master, struct mtd_partition **pparts, unsigned long fis_origin);
  52 static struct mtd_partition *parsed_parts;
  53
  54 static void __exit bcm963xx_mtd_cleanup(void);
  55
  56 static struct mtd_info *bcm963xx_mtd_info;
  57
  58 static struct map_info bcm963xx_map = {
  59        .name = "bcm963xx",
  60        .size = WINDOW_SIZE,
  61        .bankwidth = BUSWIDTH,
  62        .phys = WINDOW_ADDR,
  63 };
  64
  65
  66 int parse_cfe_partitions( struct mtd_info *master, struct mtd_partition **pparts)
  67 {
  68        int nrparts = 2, curpart = 0; // CFE and NVRAM always present.
  69        struct bcm963xx_cfe_map {
  70        unsigned char tagVersion[4];                            // Version of the image tag
  71        unsigned char sig_1[20];                                // Company Line 1
  72        unsigned char sig_2[14];                                // Company Line 2
  73        unsigned char chipid[6];                                        // Chip this image is for
  74        unsigned char boardid[16];                              // Board name
  75        unsigned char bigEndian[2];                             // Map endianness -- 1 BE 0 LE
  76        unsigned char totalLength[IMAGE_LEN];           //Total length of image
  77        unsigned char cfeAddress[ADDRESS_LEN];  // Address in memory of CFE
  78        unsigned char cfeLength[IMAGE_LEN];             // Size of CFE
  79        unsigned char rootAddress[ADDRESS_LEN];         // Address in memory of rootfs
  80        unsigned char rootLength[IMAGE_LEN];            // Size of rootfs
  81        unsigned char kernelAddress[ADDRESS_LEN];       // Address in memory of kernel
  82        unsigned char kernelLength[IMAGE_LEN];  // Size of kernel
  83        unsigned char dualImage[2];                             // Unused at present
  84        unsigned char inactiveFlag[2];                  // Unused at present
  85        unsigned char reserved1[74];                            // Reserved area not in use
  86        unsigned char imageCRC[4];                              // CRC32 of images
  87        unsigned char reserved2[16];                            // Unused at present
  88        unsigned char headerCRC[4];                             // CRC32 of header excluding tagVersion
  89        unsigned char reserved3[16];                            // Unused at present
  90        } *buf;
  91        struct mtd_partition *parts;
  92        int ret;
  93        size_t retlen;
  94        unsigned int rootfsaddr, kerneladdr, spareaddr;
  95        unsigned int rootfslen, kernellen, sparelen, totallen;
  96        int namelen = 0;
  97        int i;
  98        // Allocate memory for buffer
  99        buf = vmalloc(sizeof(struct bcm963xx_cfe_map));
 100
 101        if (!buf)
 102                return -ENOMEM;
 103
 104        // Get the tag
 105        ret = master->read(master,master->erasesize,sizeof(struct bcm963xx_cfe_map), &retlen, (void *)buf);
 106        if (retlen != sizeof(struct bcm963xx_cfe_map)){
 107                vfree(buf);
 108                return -EIO;
 109        };
 110        printk("bcm963xx: CFE boot tag found with version %s and board type %s.\n",buf->tagVersion,buf->boardid);
 111        // Get the values and calculate
 112        sscanf(buf->rootAddress,"%u", &rootfsaddr);
 113        rootfsaddr = rootfsaddr - EXTENDED_SIZE;
 114        sscanf(buf->rootLength, "%u", &rootfslen);
 115        sscanf(buf->kernelAddress, "%u", &kerneladdr);
 116        kerneladdr = kerneladdr - EXTENDED_SIZE;
 117        sscanf(buf->kernelLength, "%u", &kernellen);
 118        sscanf(buf->totalLength, "%u", &totallen);
 119        spareaddr = ROUNDUP(totallen,master->erasesize) + master->erasesize;
 120        sparelen = master->size - spareaddr - master->erasesize;
 121        // Determine number of partitions
 122        namelen = 8;
 123        if (rootfslen > 0){
 124                nrparts++;
 125                namelen =+ 6;
 126        };
 127        if (kernellen > 0){
 128                nrparts++;
 129                namelen =+ 6;
 130        };
 131        // Ask kernel for more memory.
 132        parts = kmalloc(sizeof(*parts)*nrparts+10*nrparts, GFP_KERNEL);
 133        if (!parts){
 134                vfree(buf);
 135                return -ENOMEM;
 136        };
 137        memset(parts,0,sizeof(*parts)*nrparts+10*nrparts);
 138        // Start building partition list
 139        parts[curpart].name = "CFE";
 140        parts[curpart].offset = 0;
 141        parts[curpart].size = master->erasesize;
 142        curpart++;
 143        if (kernellen > 0){
 144                parts[curpart].name = "kernel";
 145                parts[curpart].offset = kerneladdr;
 146                parts[curpart].size = kernellen;
 147                curpart++;
 148        };
 149        if (rootfslen > 0){
 150                parts[curpart].name = "rootfs";
 151                parts[curpart].offset = rootfsaddr;
 152                parts[curpart].size = rootfslen;
 153                if (sparelen > 0)
 154                        parts[curpart].size += sparelen;
 155                curpart++;
 156        };
 157        parts[curpart].name = "nvram";
 158        parts[curpart].offset = master->size - master->erasesize;
 159        parts[curpart].size = master->erasesize;
 160        for (i = 0; i < nrparts; i++) {
 161           printk("bcm963xx: Partition %d is %s offset %x and length %x\n", i, parts[i].name, parts[i].offset, parts[i].size);
 162        }
 163        *pparts = parts;
 164        vfree(buf);
 165        return nrparts;
 166 };
 167
 168 static struct mtd_partition bcm963xx_parts[] = {
 169         { name: "bootloader",  size: 0,        offset: 0,      mask_flags: MTD_WRITEABLE },
 170         { name: "rootfs",              size: 0,        offset: 0},
 171         { name: "jffs2",        size: 5 * 0x10000,      offset: 57*0x10000}
 172 };
 173
 174 static int bcm963xx_parts_size = sizeof(bcm963xx_parts) / sizeof(bcm963xx_parts[0]);
 175
 176 static int bcm963xx_detect_cfe(struct mtd_info *master)
 177 {
 178        int idoffset = 0x4e0;
 179        static char idstring[8] = "CFE1CFE1";
 180        char buf[8];
 181        int ret;
 182        size_t retlen;
 183
 184        ret = master->read(master, idoffset, 8, &retlen, (void *)buf);
 185        printk("bcm963xx: Read Signature value of %s\n", buf);
 186        return strcmp(idstring,buf);
 187 }
 188
 189 static int __init bcm963xx_mtd_init(void)
 190 {
 191        printk("bcm963xx: 0x%08x at 0x%08x\n", WINDOW_SIZE, WINDOW_ADDR);
 192        bcm963xx_map.virt = ioremap(WINDOW_ADDR, WINDOW_SIZE);
 193
 194        if (!bcm963xx_map.virt) {
 195                printk("bcm963xx: Failed to ioremap\n");
 196                return -EIO;
 197        }
 198
 199        simple_map_init(&bcm963xx_map);
 200
 201        bcm963xx_mtd_info = do_map_probe("cfi_probe", &bcm963xx_map);
 202
 203        if (bcm963xx_mtd_info) {
 204                bcm963xx_mtd_info->owner = THIS_MODULE;
 205
 206                //if (boot_loader_type == BOOT_CFE)
 207                if (bcm963xx_detect_cfe(bcm963xx_mtd_info) == 0)
 208                {
 209                        int parsed_nr_parts = 0;
 210                        char * part_type;
 211                        printk("bcm963xx: CFE bootloader detected\n");
 212                        //add_mtd_device(bcm963xx_mtd_info);
 213                        //add_mtd_partitions(bcm963xx_mtd_info, bcm963xx_parts, bcm963xx_parts_size);
 214                        if (parsed_nr_parts == 0) {
 215                                int ret = parse_cfe_partitions(bcm963xx_mtd_info, &parsed_parts);
 216                                if (ret > 0) {
 217                                        part_type = "CFE";
 218                                        parsed_nr_parts = ret;
 219                                }
 220                        }
 221                        add_mtd_partitions(bcm963xx_mtd_info, parsed_parts, parsed_nr_parts);
 222                        return 0;
 223                }
 224                else
 225                {
 226                        int parsed_nr_parts = 0;
 227                        char * part_type;
 228
 229                        if (bcm963xx_mtd_info->size > 0x00400000) {
 230                                printk("Support for extended flash memory size : 0x%08X ; ONLY 64MBIT SUPPORT\n", bcm963xx_mtd_info->size);
 231                                bcm963xx_map.virt = (unsigned long)(EXTENDED_SIZE);
 232                        }
 233
 234 #ifdef CONFIG_MTD_REDBOOT_PARTS
 235                        if (parsed_nr_parts == 0) {
 236                                int ret = parse_redboot_partitions(bcm963xx_mtd_info, &parsed_parts, 0);
 237                                if (ret > 0) {
 238                                        part_type = "RedBoot";
 239                                        parsed_nr_parts = ret;
 240                                }
 241                        }
 242 #endif
 243                        add_mtd_partitions(bcm963xx_mtd_info, parsed_parts, parsed_nr_parts);
 244
 245                        return 0;
 246                }
 247        }
 248        iounmap(bcm963xx_map.virt);
 249        return -ENXIO;
 250 }
 251
 252 static void __exit bcm963xx_mtd_cleanup(void)
 253 {
 254        if (bcm963xx_mtd_info) {
 255                del_mtd_partitions(bcm963xx_mtd_info);
 256                map_destroy(bcm963xx_mtd_info);
 257        }
 258
 259        if (bcm963xx_map.virt) {
 260                iounmap(bcm963xx_map.virt);
 261                bcm963xx_map.virt = 0;
 262        }
 263 }
 264
 265 module_init(bcm963xx_mtd_init);
 266 module_exit(bcm963xx_mtd_cleanup);
 267
 268 MODULE_LICENSE("GPL");
 269 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org> Mike Albon <malbon@openwrt.org>");