target/linux/ifxmips/files/drivers/mtd/maps/ifxmips.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  15  *
  16  * Copyright (C) 2004 Liu Peng Infineon IFAP DC COM CPE
  17  * Copyright (C) 2008 John Crispin <blogic@openwrt.org>
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/types.h>
  22 #include <linux/kernel.h>
  23 #include <linux/io.h>
  24 #include <linux/init.h>
  25 #include <linux/mtd/mtd.h>
  26 #include <linux/mtd/map.h>
  27 #include <linux/mtd/partitions.h>
  28 #include <linux/mtd/cfi.h>
  29 #include <asm/ifxmips/ifxmips.h>
  30 #include <asm/ifxmips/ifxmips_prom.h>
  31 #include <asm/ifxmips/ifxmips_ebu.h>
  32 #include <linux/magic.h>
  33 #include <linux/platform_device.h>
  34
  35 #ifndef CONFIG_MTD_PARTITIONS
  36 #error Please enable CONFIG_MTD_PARTITIONS
  37 #endif
  38
  39 static struct map_info ifxmips_map = {
  40         .name = "ifx-nor",
  41         .bankwidth = 2,
  42         .size = 0x400000,
  43 };
  44
  45 static map_word ifxmips_read16(struct map_info *map, unsigned long adr)
  46 {
  47         unsigned long flags;
  48         map_word temp;
  49         spin_lock_irqsave(&ebu_lock, flags);
  50         adr ^= 2;
  51         temp.x[0] = *((__u16 *)(map->virt + adr));
  52         spin_unlock_irqrestore(&ebu_lock, flags);
  53         return temp;
  54 }
  55
  56 static void ifxmips_write16(struct map_info *map, map_word d, unsigned long adr)
  57 {
  58         unsigned long flags;
  59         spin_lock_irqsave(&ebu_lock, flags);
  60         adr ^= 2;
  61         *((__u16 *)(map->virt + adr)) = d.x[0];
  62         spin_unlock_irqrestore(&ebu_lock, flags);
  63 }
  64
  65 void ifxmips_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
  66 {
  67         unsigned char *p;
  68         unsigned char *to_8;
  69         unsigned long flags;
  70         spin_lock_irqsave(&ebu_lock, flags);
  71         from = (unsigned long)(from + map->virt);
  72         p = (unsigned char *) from;
  73         to_8 = (unsigned char *) to;
  74         while (len--)
  75                 *to_8++ = *p++;
  76         spin_unlock_irqrestore(&ebu_lock, flags);
  77 }
  78
  79 void ifxmips_copy_to(struct map_info *map,
  80                      unsigned long to,
  81                      const void *from,
  82                      ssize_t len)
  83 {
  84         unsigned char *p =  (unsigned char *)from;
  85         unsigned char *to_8;
  86         unsigned long flags;
  87         spin_lock_irqsave(&ebu_lock, flags);
  88         to += (unsigned long) map->virt;
  89         to_8 = (unsigned char *)to;
  90         while (len--)
  91                 *p++ = *to_8++;
  92         spin_unlock_irqrestore(&ebu_lock, flags);
  93 }
  94
  95 static struct mtd_partition ifxmips_partitions[] = {
  96         {
  97                 .name = "uboot",
  98                 .offset = 0x00000000,
  99                 .size = 0x00020000,
 100         },
 101         {
 102                 .name = "uboot_env",
 103                 .offset = 0x00020000,
 104                 .size = 0x00010000,
 105         },
 106         {
 107                 .name = "kernel",
 108                 .offset = 0x00030000,
 109                 .size = 0x0,
 110         },
 111         {
 112                 .name = "rootfs",
 113                 .offset = 0x0,
 114                 .size = 0x0,
 115         },
 116         {
 117                 .name = "board_config",
 118                 .offset = 0x0,
 119                 .size = 0x0,
 120         },
 121 };
 122
 123 static struct mtd_partition ifxmips_meta_partition = {
 124         .name = "linux",
 125         .offset = 0x00030000,
 126         .size = 0x0,
 127 };
 128
 129 static const char *part_probe_types[] = { "cmdlinepart", NULL };
 130
 131 int find_uImage_size(unsigned long start_offset)
 132 {
 133         unsigned long magic;
 134         unsigned long temp;
 135         ifxmips_copy_from(&ifxmips_map, &magic, start_offset, 4);
 136         if (!(ntohl(magic) == 0x27051956)) {
 137                 printk(KERN_INFO "ifxmips_mtd: invalid magic (0x%08X) of kernel at 0x%08lx \n", ntohl(magic), start_offset);
 138                 return 0;
 139         }
 140         ifxmips_copy_from(&ifxmips_map, &temp, start_offset + 12, 4);
 141         printk(KERN_INFO "ifxmips_mtd: kernel size is %ld \n", temp + 0x40);
 142         return temp + 0x40;
 143 }
 144
 145 int find_brn_block(unsigned long start_offset)
 146 {
 147         unsigned char temp[9];
 148         ifxmips_copy_from(&ifxmips_map, &temp, start_offset, 8);
 149         temp[8] = '\0';
 150         printk(KERN_INFO "data in brn block %s\n", temp);
 151         if (memcmp(temp, "BRN-BOOT", 8) == 0)
 152                 return 1;
 153         else
 154                 return 0;
 155 }
 156
 157 int detect_squashfs_partition(unsigned long start_offset)
 158 {
 159         unsigned long temp;
 160         ifxmips_copy_from(&ifxmips_map, &temp, start_offset, 4);
 161         return temp == SQUASHFS_MAGIC;
 162 }
 163
 164 static int ifxmips_mtd_probe(struct platform_device *dev)
 165 {
 166         struct mtd_info *ifxmips_mtd = NULL;
 167         struct mtd_partition *parts = NULL;
 168         unsigned long uimage_size;
 169         int err, i;
 170         int kernel_part = 2, rootfs_part = 3;
 171         int num_parts = ARRAY_SIZE(ifxmips_partitions);
 172
 173         ifxmips_w32(0x1d7ff, IFXMIPS_EBU_BUSCON0);
 174
 175         ifxmips_map.read = ifxmips_read16;
 176         ifxmips_map.write = ifxmips_write16;
 177         ifxmips_map.copy_from = ifxmips_copy_from;
 178         ifxmips_map.copy_to = ifxmips_copy_to;
 179         ifxmips_map.phys = dev->resource->start;
 180         ifxmips_map.size = dev->resource->end - ifxmips_map.phys + 1;
 181         ifxmips_map.virt = ioremap_nocache(ifxmips_map.phys, ifxmips_map.size);
 182
 183         if (!ifxmips_map.virt) {
 184                 printk(KERN_WARNING "ifxmips_mtd: failed to ioremap!\n");
 185                 return -EIO;
 186         }
 187
 188         ifxmips_mtd = (struct mtd_info *) do_map_probe("cfi_probe", &ifxmips_map);
 189         if (!ifxmips_mtd) {
 190                 iounmap(ifxmips_map.virt);
 191                 printk(KERN_WARNING "ifxmips_mtd: probing failed\n");
 192                 return -ENXIO;
 193         }
 194
 195         ifxmips_mtd->owner = THIS_MODULE;
 196
 197         err = parse_mtd_partitions(ifxmips_mtd, part_probe_types, &parts, 0);
 198         if (err > 0) {
 199                 printk(KERN_INFO "ifxmips_mtd: found %d partitions from cmdline\n", err);
 200                 num_parts = err;
 201                 kernel_part = 0;
 202                 rootfs_part = 0;
 203                 for (i = 0; i < num_parts; i++) {
 204                         if (strcmp(parts[i].name, "kernel") == 0)
 205                                 kernel_part = i;
 206                         if (strcmp(parts[i].name, "rootfs") == 0)
 207                                 rootfs_part = i;
 208                 }
 209         } else {
 210                 parts = &ifxmips_partitions[0];
 211         }
 212
 213         /* dynamic size detection only if rootfs-part follows kernel-part */
 214         if (kernel_part+1 == rootfs_part) {
 215                 uimage_size = find_uImage_size(parts[kernel_part].offset);
 216
 217                 if (detect_squashfs_partition(parts[kernel_part].offset + uimage_size)) {
 218                         printk(KERN_INFO "ifxmips_mtd: found a squashfs following the uImage\n");
 219                 } else {
 220                         uimage_size &= ~0xffff;
 221                         uimage_size += 0x10000;
 222                 }
 223
 224                 parts[kernel_part].size = uimage_size;
 225                 parts[rootfs_part].offset = parts[kernel_part].offset + parts[kernel_part].size;
 226                 parts[rootfs_part].size = ((ifxmips_mtd->size >> 20) * 1024 * 1024) - parts[rootfs_part].offset;
 227
 228                 ifxmips_meta_partition.offset = parts[kernel_part].offset;
 229                 ifxmips_meta_partition.size = parts[kernel_part].size + parts[rootfs_part].size;
 230         }
 231
 232         if (err <= 0) {
 233                 if (ifxmips_has_brn_block()) {
 234                         parts[4].size -= ifxmips_mtd->erasesize;
 235                         parts[5].offset = ifxmips_mtd->size - ifxmips_mtd->erasesize;
 236                         parts[5].size = ifxmips_mtd->erasesize;
 237                 } else {
 238                         num_parts--;
 239                 }
 240         }
 241
 242         add_mtd_partitions(ifxmips_mtd, parts, num_parts);
 243         add_mtd_partitions(ifxmips_mtd, &ifxmips_meta_partition, 1);
 244
 245         printk(KERN_INFO "ifxmips_mtd: added %s flash with %dMB\n",
 246                 ifxmips_map.name, ifxmips_mtd->size >> 20);
 247         return 0;
 248 }
 249
 250 static struct platform_driver ifxmips_mtd_driver = {
 251         .probe = ifxmips_mtd_probe,
 252         .driver = {
 253                 .name = "ifxmips_mtd",
 254                 .owner = THIS_MODULE,
 255         },
 256 };
 257
 258 int __init init_ifxmips_mtd(void)
 259 {
 260         int ret = platform_driver_register(&ifxmips_mtd_driver);
 261         if (ret)
 262                 printk(KERN_INFO "ifxmips_mtd: error registering platfom driver!");
 263         return ret;
 264 }
 265
 266 static void __exit cleanup_ifxmips_mtd(void)
 267 {
 268         platform_driver_unregister(&ifxmips_mtd_driver);
 269 }
 270
 271 module_init(init_ifxmips_mtd);
 272 module_exit(cleanup_ifxmips_mtd);
 273
 274 MODULE_LICENSE("GPL");
 275 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
 276 MODULE_DESCRIPTION("MTD map driver for IFXMIPS boards");