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 <linux/magic.h>
  30 #include <linux/platform_device.h>
  31
  32 #include <ifxmips.h>
  33 #include <ifxmips_prom.h>
  34 #include <ifxmips_ebu.h>
  35
  36 #ifndef CONFIG_MTD_PARTITIONS
  37 #error Please enable CONFIG_MTD_PARTITIONS
  38 #endif
  39
  40 static struct map_info ifxmips_map = {
  41         .name = "ifx-nor",
  42         .bankwidth = 2,
  43         .size = 0x400000,
  44 };
  45
  46 static map_word ifxmips_read16(struct map_info *map, unsigned long adr)
  47 {
  48         unsigned long flags;
  49         map_word temp;
  50         spin_lock_irqsave(&ebu_lock, flags);
  51         adr ^= 2;
  52         temp.x[0] = *((__u16 *)(map->virt + adr));
  53         spin_unlock_irqrestore(&ebu_lock, flags);
  54         return temp;
  55 }
  56
  57 static void ifxmips_write16(struct map_info *map, map_word d, unsigned long adr)
  58 {
  59         unsigned long flags;
  60         spin_lock_irqsave(&ebu_lock, flags);
  61         adr ^= 2;
  62         *((__u16 *)(map->virt + adr)) = d.x[0];
  63         spin_unlock_irqrestore(&ebu_lock, flags);
  64 }
  65
  66 void ifxmips_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
  67 {
  68         unsigned char *p;
  69         unsigned char *to_8;
  70         unsigned long flags;
  71         spin_lock_irqsave(&ebu_lock, flags);
  72         from = (unsigned long)(from + map->virt);
  73         p = (unsigned char *) from;
  74         to_8 = (unsigned char *) to;
  75         while (len--)
  76                 *to_8++ = *p++;
  77         spin_unlock_irqrestore(&ebu_lock, flags);
  78 }
  79
  80 void ifxmips_copy_to(struct map_info *map,
  81                      unsigned long to,
  82                      const void *from,
  83                      ssize_t len)
  84 {
  85         unsigned char *p =  (unsigned char *)from;
  86         unsigned char *to_8;
  87         unsigned long flags;
  88         spin_lock_irqsave(&ebu_lock, flags);
  89         to += (unsigned long) map->virt;
  90         to_8 = (unsigned char *)to;
  91         while (len--)
  92                 *p++ = *to_8++;
  93         spin_unlock_irqrestore(&ebu_lock, flags);
  94 }
  95
  96 static struct mtd_partition ifxmips_partitions[] = {
  97         {
  98                 .name = "uboot",
  99                 .offset = 0x00000000,
 100                 .size = 0x00020000,
 101         },
 102         {
 103                 .name = "uboot_env",
 104                 .offset = 0x00020000,
 105                 .size = 0x0,
 106         },
 107         {
 108                 .name = "kernel",
 109                 .offset = 0x0,
 110                 .size = 0x0,
 111         },
 112         {
 113                 .name = "rootfs",
 114                 .offset = 0x0,
 115                 .size = 0x0,
 116         },
 117         {
 118                 .name = "board_config",
 119                 .offset = 0x0,
 120                 .size = 0x0,
 121         },
 122 };
 123
 124 static struct mtd_partition ifxmips_meta_partition = {
 125         .name = "linux",
 126         .offset = 0x00030000,
 127         .size = 0x0,
 128 };
 129
 130 static const char *part_probe_types[] = { "cmdlinepart", NULL };
 131
 132 int find_uImage_size(unsigned long start_offset)
 133 {
 134         unsigned long magic;
 135         unsigned long temp;
 136         ifxmips_copy_from(&ifxmips_map, &magic, start_offset, 4);
 137         if (le32_to_cpu(magic) != 0x56190527) {
 138                 printk(KERN_INFO "ifxmips_mtd: invalid magic (0x%08X) of kernel at 0x%08lx \n", le32_to_cpu(magic), start_offset);
 139                 return 0;
 140         }
 141         ifxmips_copy_from(&ifxmips_map, &temp, start_offset + 12, 4);
 142         printk(KERN_INFO "ifxmips_mtd: kernel size is %ld \n", temp + 0x40);
 143         return temp + 0x40;
 144 }
 145
 146 int find_brn_block(unsigned long start_offset)
 147 {
 148         unsigned char temp[9];
 149         ifxmips_copy_from(&ifxmips_map, &temp, start_offset, 8);
 150         temp[8] = '\0';
 151         printk(KERN_INFO "data in brn block %s\n", temp);
 152         if (memcmp(temp, "BRN-BOOT", 8) == 0)
 153                 return 1;
 154         else
 155                 return 0;
 156 }
 157
 158 int detect_squashfs_partition(unsigned long start_offset)
 159 {
 160         unsigned long temp;
 161         ifxmips_copy_from(&ifxmips_map, &temp, start_offset, 4);
 162         return le32_to_cpu(temp) == SQUASHFS_MAGIC;
 163 }
 164
 165 static int ifxmips_mtd_probe(struct platform_device *dev)
 166 {
 167         struct mtd_info *ifxmips_mtd = NULL;
 168         struct mtd_partition *parts = NULL;
 169         unsigned long uimage_size;
 170         int err, i;
 171         int kernel_part = 2, rootfs_part = 3;
 172         int num_parts = ARRAY_SIZE(ifxmips_partitions);
 173
 174         ifxmips_w32(0x1d7ff, IFXMIPS_EBU_BUSCON0);
 175
 176         ifxmips_map.read = ifxmips_read16;
 177         ifxmips_map.write = ifxmips_write16;
 178         ifxmips_map.copy_from = ifxmips_copy_from;
 179         ifxmips_map.copy_to = ifxmips_copy_to;
 180         ifxmips_map.phys = dev->resource->start;
 181         ifxmips_map.size = dev->resource->end - ifxmips_map.phys + 1;
 182         ifxmips_map.virt = ioremap_nocache(ifxmips_map.phys, ifxmips_map.size);
 183
 184         if (!ifxmips_map.virt) {
 185                 printk(KERN_WARNING "ifxmips_mtd: failed to ioremap!\n");
 186                 return -EIO;
 187         }
 188
 189         ifxmips_mtd = (struct mtd_info *) do_map_probe("cfi_probe", &ifxmips_map);
 190         if (!ifxmips_mtd) {
 191                 iounmap(ifxmips_map.virt);
 192                 printk(KERN_WARNING "ifxmips_mtd: probing failed\n");
 193                 return -ENXIO;
 194         }
 195
 196         ifxmips_mtd->owner = THIS_MODULE;
 197
 198         err = parse_mtd_partitions(ifxmips_mtd, part_probe_types, &parts, 0);
 199         if (err > 0) {
 200                 printk(KERN_INFO "ifxmips_mtd: found %d partitions from cmdline\n", err);
 201                 num_parts = err;
 202                 kernel_part = 0;
 203                 rootfs_part = 0;
 204                 for (i = 0; i < num_parts; i++) {
 205                         if (strcmp(parts[i].name, "kernel") == 0)
 206                                 kernel_part = i;
 207                         if (strcmp(parts[i].name, "rootfs") == 0)
 208                                 rootfs_part = i;
 209                 }
 210         } else {
 211                 /* if the flash is 64k sectors, the kernel will reside at 0xb0030000
 212                    if the flash is 128k sectors, the kernel will reside at 0xb0040000 */
 213                 ifxmips_partitions[1].size = ifxmips_mtd->erasesize;
 214                 ifxmips_partitions[2].offset = ifxmips_partitions[1].offset + ifxmips_mtd->erasesize;
 215                 parts = &ifxmips_partitions[0];
 216         }
 217
 218         /* dynamic size detection only if rootfs-part follows kernel-part */
 219         if (kernel_part+1 == rootfs_part) {
 220                 uimage_size = find_uImage_size(parts[kernel_part].offset);
 221
 222                 if (detect_squashfs_partition(parts[kernel_part].offset + uimage_size)) {
 223                         printk(KERN_INFO "ifxmips_mtd: found a squashfs following the uImage\n");
 224                 } else {
 225                         uimage_size &= ~(ifxmips_mtd->erasesize -1);
 226                         uimage_size += ifxmips_mtd->erasesize;
 227                 }
 228
 229                 parts[kernel_part].size = uimage_size;
 230                 parts[rootfs_part].offset = parts[kernel_part].offset + parts[kernel_part].size;
 231                 parts[rootfs_part].size = ((ifxmips_mtd->size >> 20) * 1024 * 1024) - parts[rootfs_part].offset;
 232
 233                 ifxmips_meta_partition.offset = parts[kernel_part].offset;
 234                 ifxmips_meta_partition.size = parts[kernel_part].size + parts[rootfs_part].size;
 235         }
 236
 237         if (err <= 0) {
 238                 if (ifxmips_has_brn_block()) {
 239                         parts[3].size -= ifxmips_mtd->erasesize;
 240                         parts[4].offset = ifxmips_mtd->size - ifxmips_mtd->erasesize;
 241                         parts[4].size = ifxmips_mtd->erasesize;
 242                         ifxmips_meta_partition.size -= ifxmips_mtd->erasesize;
 243                 } else {
 244                         num_parts--;
 245                 }
 246         }
 247
 248         add_mtd_partitions(ifxmips_mtd, parts, num_parts);
 249         add_mtd_partitions(ifxmips_mtd, &ifxmips_meta_partition, 1);
 250
 251         printk(KERN_INFO "ifxmips_mtd: added %s flash with %dMB\n",
 252                 ifxmips_map.name, ((int)ifxmips_mtd->size) >> 20);
 253         return 0;
 254 }
 255
 256 static struct platform_driver ifxmips_mtd_driver = {
 257         .probe = ifxmips_mtd_probe,
 258         .driver = {
 259                 .name = "ifxmips_mtd",
 260                 .owner = THIS_MODULE,
 261         },
 262 };
 263
 264 int __init init_ifxmips_mtd(void)
 265 {
 266         int ret = platform_driver_register(&ifxmips_mtd_driver);
 267         if (ret)
 268                 printk(KERN_INFO "ifxmips_mtd: error registering platfom driver!");
 269         return ret;
 270 }
 271
 272 static void __exit cleanup_ifxmips_mtd(void)
 273 {
 274         platform_driver_unregister(&ifxmips_mtd_driver);
 275 }
 276
 277 module_init(init_ifxmips_mtd);
 278 module_exit(cleanup_ifxmips_mtd);
 279
 280 MODULE_LICENSE("GPL");
 281 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
 282 MODULE_DESCRIPTION("MTD map driver for IFXMIPS boards");