target/linux/adm5120-2.6/files/drivers/mtd/maps/adm5120_mtd.c

   1 /*
   2  *  Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
   3  *  Copyright (C) 2005 Waldemar Brodkorb <wbx@openwrt.org>
   4  *  Copyright (C) 2004 Florian Schirmer (jolt@tuxbox.org)
   5  *
   6  *  original functions for finding root filesystem from Mike Baker
   7  *
   8  *  This program is free software; you can redistribute  it and/or modify it
   9  *  under  the terms of  the GNU General  Public License as published by the
  10  *  Free Software Foundation;  either version 2 of the  License, or (at your
  11  *  option) any later version.
  12  *
  13  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  14  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  15  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  16  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  17  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  18  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  19  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  20  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  21  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  22  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  23  *
  24  *  You should have received a copy of the  GNU General Public License along
  25  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  26  *  675 Mass Ave, Cambridge, MA 02139, USA.
  27  *
  28  *  Copyright 2001-2003, Broadcom Corporation
  29  *  All Rights Reserved.
  30  *
  31  *  THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
  32  *  KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
  33  *  SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
  34  *  FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
  35  *
  36  *  Flash mapping for ADM5120 boards
  37  */
  38
  39 #include <linux/init.h>
  40 #include <linux/module.h>
  41 #include <linux/types.h>
  42 #include <linux/kernel.h>
  43 #include <linux/wait.h>
  44 #include <linux/mtd/mtd.h>
  45 #include <linux/mtd/map.h>
  46 #ifdef CONFIG_MTD_PARTITIONS
  47 #include <linux/mtd/partitions.h>
  48 #endif
  49 #include <linux/squashfs_fs.h>
  50 #include <linux/jffs2.h>
  51 #include <linux/crc32.h>
  52 #include <asm/io.h>
  53 #include <asm/mach-adm5120/myloader.h>
  54 #include <asm/mach-adm5120/adm5120_info.h>
  55
  56 extern int parse_myloader_partitions(struct mtd_info *master,
  57                         struct mtd_partition **pparts,
  58                         unsigned long origin);
  59
  60 /* Macros for switching flash bank
  61    ADM5120 only support 2MB flash address space
  62    so GPIO5 is used as A20
  63  */
  64 #define GPIO_IO        ((volatile unsigned long *)0xb20000b8)
  65 #define FLASH_A20_GPIO  5
  66 #define FLASH_BOUNDARY  0x200000
  67
  68
  69 #define TRX_MAGIC       0x30524448      /* "HDR0" */
  70 #define TRX_VERSION     1
  71 #define TRX_MAX_LEN     0x3A0000
  72 #define TRX_NO_HEADER   1               /* Do not write TRX header */
  73 #define TRX_GZ_FILES    0x2     /* Contains up to TRX_MAX_OFFSET individual gzip files */
  74 #define TRX_MAX_OFFSET  3
  75
  76 struct trx_header {
  77         u32 magic;              /* "HDR0" */
  78         u32 len;                /* Length of file including header */
  79         u32 crc32;              /* 32-bit CRC from flag_version to end of file */
  80         u32 flag_version;       /* 0:15 flags, 16:31 version */
  81         u32 offsets[TRX_MAX_OFFSET];    /* Offsets of partitions from start of header */
  82 };
  83
  84 #define ROUNDUP(x, y) ((((x)+((y)-1))/(y))*(y))
  85 #define NVRAM_SPACE 0x8000
  86 #define WINDOW_ADDR 0x1fc00000
  87 #define WINDOW_SIZE 0x400000
  88 #define BUSWIDTH 2
  89
  90 static struct mtd_info *adm5120_mtd;
  91
  92 static struct map_info adm5120_map = {
  93         name: "adm5120 physically mapped flash",
  94         size: WINDOW_SIZE,
  95         bankwidth: BUSWIDTH,
  96         phys: WINDOW_ADDR,
  97 };
  98
  99 #ifdef CONFIG_MTD_PARTITIONS
 100
 101 static struct mtd_partition adm5120_cfe_parts[] = {
 102         { name: "cfe",  offset: 0, size: 0, mask_flags: MTD_WRITEABLE, },
 103         { name: "linux", offset: 0, size: 0, },
 104         { name: "rootfs", offset: 0, size: 0, },
 105         { name: "nvram", offset: 0, size: 0, },
 106         { name: NULL, },
 107 };
 108
 109
 110 static void flash_switch_bank(unsigned long addr)
 111 {
 112         unsigned long val;
 113
 114         /* Set GPIO as output */
 115         val = *GPIO_IO | (1 << (FLASH_A20_GPIO+16));
 116         if ( addr & FLASH_BOUNDARY ) {
 117                 val |= 1 << (FLASH_A20_GPIO + 24);
 118         } else {
 119                 val &= ~(1 << (FLASH_A20_GPIO + 24));
 120         }
 121         *GPIO_IO = val;
 122 }
 123
 124 static map_word adm5120_map_read(struct map_info *map, unsigned long ofs)
 125 {
 126     flash_switch_bank(ofs);
 127         return inline_map_read(map, ofs);
 128 }
 129
 130 static void adm5120_map_write(struct map_info *map, const map_word datum, unsigned long ofs)
 131 {
 132     flash_switch_bank(ofs);
 133         inline_map_write(map, datum, ofs);
 134 }
 135
 136 static void adm5120_map_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
 137 {
 138         ssize_t tmp;
 139
 140         if (from < FLASH_BOUNDARY) {
 141                 tmp = (len < (FLASH_BOUNDARY - from)) ? len : (FLASH_BOUNDARY - from);
 142                 flash_switch_bank(0);
 143                 inline_map_copy_from(map, to, from, tmp);
 144                 to = (void *)((char *)to + tmp);
 145                 from += tmp;
 146                 len -= tmp;
 147         }
 148         if (len > 0) {
 149                 flash_switch_bank(FLASH_BOUNDARY);
 150                 inline_map_copy_from(map, to, from, len);
 151         }
 152
 153 }
 154
 155 static int __init
 156 find_cfe_size(struct mtd_info *mtd, size_t size)
 157 {
 158         struct trx_header *trx;
 159         unsigned char buf[512];
 160         int off;
 161         size_t len;
 162         int blocksize;
 163
 164         trx = (struct trx_header *) buf;
 165
 166         blocksize = mtd->erasesize;
 167         if (blocksize < 0x10000)
 168                 blocksize = 0x10000;
 169
 170         for (off = (128*1024); off < size; off += blocksize) {
 171                 memset(buf, 0xe5, sizeof(buf));
 172
 173                 /*
 174                  * Read into buffer
 175                  */
 176                 if (mtd->read(mtd, off, sizeof(buf), &len, buf) ||
 177                     len != sizeof(buf))
 178                         continue;
 179
 180                 /* found a TRX header */
 181                 if (le32_to_cpu(trx->magic) == TRX_MAGIC) {
 182                         goto found;
 183                 }
 184         }
 185
 186         printk(KERN_NOTICE
 187                "%s: Couldn't find bootloader size\n",
 188                mtd->name);
 189         return -1;
 190
 191  found:
 192         printk(KERN_NOTICE "bootloader size: %d\n", off);
 193         return off;
 194
 195 }
 196
 197 /*
 198  * Copied from mtdblock.c
 199  *
 200  * Cache stuff...
 201  *
 202  * Since typical flash erasable sectors are much larger than what Linux's
 203  * buffer cache can handle, we must implement read-modify-write on flash
 204  * sectors for each block write requests.  To avoid over-erasing flash sectors
 205  * and to speed things up, we locally cache a whole flash sector while it is
 206  * being written to until a different sector is required.
 207  */
 208
 209 static void erase_callback(struct erase_info *done)
 210 {
 211         wait_queue_head_t *wait_q = (wait_queue_head_t *)done->priv;
 212         wake_up(wait_q);
 213 }
 214
 215 static int erase_write (struct mtd_info *mtd, unsigned long pos,
 216                         int len, const char *buf)
 217 {
 218         struct erase_info erase;
 219         DECLARE_WAITQUEUE(wait, current);
 220         wait_queue_head_t wait_q;
 221         size_t retlen;
 222         int ret;
 223
 224         /*
 225          * First, let's erase the flash block.
 226          */
 227
 228         init_waitqueue_head(&wait_q);
 229         erase.mtd = mtd;
 230         erase.callback = erase_callback;
 231         erase.addr = pos;
 232         erase.len = len;
 233         erase.priv = (u_long)&wait_q;
 234
 235         set_current_state(TASK_INTERRUPTIBLE);
 236         add_wait_queue(&wait_q, &wait);
 237
 238         ret = mtd->erase(mtd, &erase);
 239         if (ret) {
 240                 set_current_state(TASK_RUNNING);
 241                 remove_wait_queue(&wait_q, &wait);
 242                 printk (KERN_WARNING "erase of region [0x%lx, 0x%x] "
 243                                      "on \"%s\" failed\n",
 244                         pos, len, mtd->name);
 245                 return ret;
 246         }
 247
 248         schedule();  /* Wait for erase to finish. */
 249         remove_wait_queue(&wait_q, &wait);
 250
 251         /*
 252          * Next, writhe data to flash.
 253          */
 254
 255         ret = mtd->write (mtd, pos, len, &retlen, buf);
 256         if (ret)
 257                 return ret;
 258         if (retlen != len)
 259                 return -EIO;
 260         return 0;
 261 }
 262
 263
 264
 265
 266 static int __init
 267 find_root(struct mtd_info *mtd, size_t size, struct mtd_partition *part)
 268 {
 269         struct trx_header trx, *trx2;
 270         unsigned char buf[512], *block;
 271         int off, blocksize;
 272         u32 i, crc = ~0;
 273         size_t len;
 274         struct squashfs_super_block *sb = (struct squashfs_super_block *) buf;
 275
 276         blocksize = mtd->erasesize;
 277         if (blocksize < 0x10000)
 278                 blocksize = 0x10000;
 279
 280         for (off = (128*1024); off < size; off += blocksize) {
 281                 memset(&trx, 0xe5, sizeof(trx));
 282
 283                 /*
 284                  * Read into buffer
 285                  */
 286                 if (mtd->read(mtd, off, sizeof(trx), &len, (char *) &trx) ||
 287                     len != sizeof(trx))
 288                         continue;
 289
 290                 /* found a TRX header */
 291                 if (le32_to_cpu(trx.magic) == TRX_MAGIC) {
 292                         part->offset = le32_to_cpu(trx.offsets[2]) ? :
 293                                 le32_to_cpu(trx.offsets[1]);
 294                         part->size = le32_to_cpu(trx.len);
 295
 296                         part->size -= part->offset;
 297                         part->offset += off;
 298
 299                         goto found;
 300                 }
 301         }
 302
 303         printk(KERN_NOTICE
 304                "%s: Couldn't find root filesystem\n",
 305                mtd->name);
 306         return -1;
 307
 308  found:
 309         if (part->size == 0)
 310                 return 0;
 311
 312         if (mtd->read(mtd, part->offset, sizeof(buf), &len, buf) || len != sizeof(buf))
 313                 return 0;
 314
 315         /* Move the fs outside of the trx */
 316         part->size = 0;
 317
 318         if (trx.len != part->offset + part->size - off) {
 319                 /* Update the trx offsets and length */
 320                 trx.len = part->offset + part->size - off;
 321
 322                 /* Update the trx crc32 */
 323                 for (i = (u32) &(((struct trx_header *)NULL)->flag_version); i <= trx.len; i += sizeof(buf)) {
 324                         if (mtd->read(mtd, off + i, sizeof(buf), &len, buf) || len != sizeof(buf))
 325                                 return 0;
 326                         crc = crc32_le(crc, buf, min(sizeof(buf), trx.len - i));
 327                 }
 328                 trx.crc32 = crc;
 329
 330                 /* read first eraseblock from the trx */
 331                 block = kmalloc(mtd->erasesize, GFP_KERNEL);
 332                 trx2 = (struct trx_header *) block;
 333                 if (mtd->read(mtd, off, mtd->erasesize, &len, block) || len != mtd->erasesize) {
 334                         printk("Error accessing the first trx eraseblock\n");
 335                         return 0;
 336                 }
 337
 338                 printk("Updating TRX offsets and length:\n");
 339                 printk("old trx = [0x%08x, 0x%08x, 0x%08x], len=0x%08x crc32=0x%08x\n", trx2->offsets[0], trx2->offsets[1], trx2->offsets[2], trx2->len, trx2->crc32);
 340                 printk("new trx = [0x%08x, 0x%08x, 0x%08x], len=0x%08x crc32=0x%08x\n",   trx.offsets[0],   trx.offsets[1],   trx.offsets[2],   trx.len, trx.crc32);
 341
 342                 /* Write updated trx header to the flash */
 343                 memcpy(block, &trx, sizeof(trx));
 344                 if (mtd->unlock)
 345                         mtd->unlock(mtd, off, mtd->erasesize);
 346                 erase_write(mtd, off, mtd->erasesize, block);
 347                 if (mtd->sync)
 348                         mtd->sync(mtd);
 349                 kfree(block);
 350                 printk("Done\n");
 351         }
 352
 353         return part->size;
 354 }
 355
 356 struct mtd_partition * __init
 357 init_mtd_partitions(struct mtd_info *mtd, size_t size)
 358 {
 359         int cfe_size;
 360
 361         if ((cfe_size = find_cfe_size(mtd,size)) < 0)
 362                 return NULL;
 363
 364         /* boot loader */
 365         adm5120_cfe_parts[0].offset = 0;
 366         adm5120_cfe_parts[0].size   = cfe_size;
 367
 368         /* nvram */
 369         if (cfe_size != 384 * 1024) {
 370                 adm5120_cfe_parts[3].offset = size - ROUNDUP(NVRAM_SPACE, mtd->erasesize);
 371                 adm5120_cfe_parts[3].size   = ROUNDUP(NVRAM_SPACE, mtd->erasesize);
 372         } else {
 373                 /* nvram (old 128kb config partition on netgear wgt634u) */
 374                 adm5120_cfe_parts[3].offset = adm5120_cfe_parts[0].size;
 375                 adm5120_cfe_parts[3].size   = ROUNDUP(NVRAM_SPACE, mtd->erasesize);
 376         }
 377
 378         /* linux (kernel and rootfs) */
 379         if (cfe_size != 384 * 1024) {
 380                 adm5120_cfe_parts[1].offset = adm5120_cfe_parts[0].size;
 381                 adm5120_cfe_parts[1].size   = adm5120_cfe_parts[3].offset -
 382                         adm5120_cfe_parts[1].offset;
 383         } else {
 384                 /* do not count the elf loader, which is on one block */
 385                 adm5120_cfe_parts[1].offset = adm5120_cfe_parts[0].size +
 386                         adm5120_cfe_parts[3].size + mtd->erasesize;
 387                 adm5120_cfe_parts[1].size   = size -
 388                         adm5120_cfe_parts[0].size -
 389                         (2*adm5120_cfe_parts[3].size) -
 390                         mtd->erasesize;
 391         }
 392
 393         /* find and size rootfs */
 394         if (find_root(mtd,size,&adm5120_cfe_parts[2])==0) {
 395                 adm5120_cfe_parts[2].size = size - adm5120_cfe_parts[2].offset -
 396                                 adm5120_cfe_parts[3].size;
 397         }
 398
 399         return adm5120_cfe_parts;
 400 }
 401 #endif
 402
 403 int __init init_adm5120_map(void)
 404 {
 405         size_t size;
 406         int ret = 0;
 407 #if defined (CONFIG_MTD_PARTITIONS) || (CONFIG_MTD_MYLOADER_PARTS)
 408         struct mtd_partition *parts;
 409         int i, parsed_nr_parts = 0;
 410 #endif
 411         printk("adm5120 : flash init : 0x%08x 0x%08x\n", WINDOW_ADDR, WINDOW_SIZE);
 412         adm5120_map.virt = ioremap_nocache(WINDOW_ADDR, WINDOW_SIZE);
 413
 414         if (!adm5120_map.virt) {
 415                 printk("Failed to ioremap\n");
 416                 return -EIO;
 417         }
 418         simple_map_init(&adm5120_map);
 419         adm5120_map.read = adm5120_map_read;
 420         adm5120_map.write = adm5120_map_write;
 421         adm5120_map.copy_from = adm5120_map_copy_from;
 422
 423         if (!(adm5120_mtd = do_map_probe("cfi_probe", &adm5120_map))) {
 424                 printk("Failed to do_map_probe\n");
 425                 iounmap((void *)adm5120_map.virt);
 426                 return -ENXIO;
 427         }
 428
 429         adm5120_mtd->owner = THIS_MODULE;
 430
 431         size = adm5120_mtd->size;
 432
 433         printk(KERN_NOTICE "Flash device: 0x%x at 0x%x\n", size, WINDOW_ADDR);
 434
 435 #ifdef CONFIG_MTD_PARTITIONS
 436
 437         if (adm5120_boot_loader == BOOT_LOADER_CFE)
 438         {
 439                 printk(KERN_NOTICE "adm5120 : using CFE flash mapping\n");
 440                 parts = init_mtd_partitions(adm5120_mtd, size);
 441
 442                 for (i = 0; parts[i].name; i++);
 443                         ret = add_mtd_partitions(adm5120_mtd, parts, i);
 444
 445                 if (ret) {
 446                         printk(KERN_ERR "Flash: add_mtd_partitions failed\n");
 447                         goto fail;
 448                 }
 449         }
 450 #endif
 451 #ifdef CONFIG_MTD_MYLOADER_PARTS
 452         if (adm5120_boot_loader == BOOT_LOADER_MYLOADER)
 453         {
 454                 printk(KERN_NOTICE "adm5120 : using MyLoader flash mapping\n");
 455                 char *part_type;
 456
 457                 if (parsed_nr_parts == 0) {
 458                         ret = parse_myloader_partitions(adm5120_mtd, &parts, 0);
 459
 460                         if (ret  > 0) {
 461                                 part_type ="MyLoader";
 462                                 parsed_nr_parts = ret;
 463                         }
 464                 }
 465                 ret = add_mtd_partitions(adm5120_mtd, parts, parsed_nr_parts);
 466
 467                 if (ret) {
 468                         printk(KERN_ERR "Flash: add_mtd_partitions failed\n");
 469                         goto fail;
 470                 }
 471         }
 472 #endif
 473         return 0;
 474
 475  fail:
 476         if (adm5120_mtd)
 477                 map_destroy(adm5120_mtd);
 478         if (adm5120_map.virt)
 479                 iounmap((void *)adm5120_map.virt);
 480         adm5120_map.virt = 0;
 481         return ret;
 482 }
 483
 484 void __exit cleanup_adm5120_map(void)
 485 {
 486 #ifdef CONFIG_MTD_PARTITIONS
 487         del_mtd_partitions(adm5120_mtd);
 488 #endif
 489         map_destroy(adm5120_mtd);
 490         iounmap((void *)adm5120_map.virt);
 491 }
 492
 493 module_init(init_adm5120_map);
 494 module_exit(cleanup_adm5120_map);