target/linux/brcm-2.4/files/drivers/mtd/maps/bcm947xx-flash.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  *
  29  * Copyright 2004, Broadcom Corporation
  30  * All Rights Reserved.
  31  *
  32  * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
  33  * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
  34  * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
  35  * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
  36  *
  37  * Flash mapping for BCM947XX boards
  38  *
  39  */
  40
  41 #include <linux/module.h>
  42 #include <linux/types.h>
  43 #include <linux/kernel.h>
  44 #include <linux/wait.h>
  45 #include <linux/mtd/mtd.h>
  46 #include <linux/mtd/map.h>
  47 #ifdef CONFIG_MTD_PARTITIONS
  48 #include <linux/mtd/partitions.h>
  49 #endif
  50 #include <linux/config.h>
  51 #include <linux/squashfs_fs.h>
  52 #include <linux/jffs2.h>
  53 #include <linux/crc32.h>
  54 #include <asm/io.h>
  55
  56 #include <typedefs.h>
  57 #include <osl.h>
  58 #include <bcmnvram.h>
  59 #include <bcmutils.h>
  60 #include <sbconfig.h>
  61 #include <sbchipc.h>
  62 #include <sbutils.h>
  63 #include <trxhdr.h>
  64
  65 /* Global SB handle */
  66 extern void *bcm947xx_sbh;
  67 extern spinlock_t bcm947xx_sbh_lock;
  68
  69 /* Convenience */
  70 #define sbh bcm947xx_sbh
  71 #define sbh_lock bcm947xx_sbh_lock
  72
  73 #define WINDOW_ADDR 0x1fc00000
  74 #define WINDOW_SIZE 0x400000
  75 #define BUSWIDTH 2
  76
  77 static struct mtd_info *bcm947xx_mtd;
  78
  79 __u8 bcm947xx_map_read8(struct map_info *map, unsigned long ofs)
  80 {
  81         if (map->map_priv_2 == 1)
  82                 return __raw_readb(map->map_priv_1 + ofs);
  83
  84         u16 val = __raw_readw(map->map_priv_1 + (ofs & ~1));
  85         if (ofs & 1)
  86                 return ((val >> 8) & 0xff);
  87         else
  88                 return (val & 0xff);
  89 }
  90
  91 __u16 bcm947xx_map_read16(struct map_info *map, unsigned long ofs)
  92 {
  93         return __raw_readw(map->map_priv_1 + ofs);
  94 }
  95
  96 __u32 bcm947xx_map_read32(struct map_info *map, unsigned long ofs)
  97 {
  98         return __raw_readl(map->map_priv_1 + ofs);
  99 }
 100
 101 void bcm947xx_map_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
 102 {
 103         if (len==1) {
 104                 memcpy_fromio(to, map->map_priv_1 + from, len);
 105         } else {
 106                 int i;
 107                 u16 *dest = (u16 *) to;
 108                 u16 *src  = (u16 *) (map->map_priv_1 + from);
 109                 for (i = 0; i < (len / 2); i++) {
 110                         dest[i] = src[i];
 111                 }
 112                 if (len & 1)
 113                         *((u8 *)dest+len-1) = src[i] & 0xff;
 114         }
 115 }
 116
 117 void bcm947xx_map_write8(struct map_info *map, __u8 d, unsigned long adr)
 118 {
 119         __raw_writeb(d, map->map_priv_1 + adr);
 120         mb();
 121 }
 122
 123 void bcm947xx_map_write16(struct map_info *map, __u16 d, unsigned long adr)
 124 {
 125         __raw_writew(d, map->map_priv_1 + adr);
 126         mb();
 127 }
 128
 129 void bcm947xx_map_write32(struct map_info *map, __u32 d, unsigned long adr)
 130 {
 131         __raw_writel(d, map->map_priv_1 + adr);
 132         mb();
 133 }
 134
 135 void bcm947xx_map_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
 136 {
 137         memcpy_toio(map->map_priv_1 + to, from, len);
 138 }
 139
 140 struct map_info bcm947xx_map = {
 141         name: "Physically mapped flash",
 142         size: WINDOW_SIZE,
 143         buswidth: BUSWIDTH,
 144         read8: bcm947xx_map_read8,
 145         read16: bcm947xx_map_read16,
 146         read32: bcm947xx_map_read32,
 147         copy_from: bcm947xx_map_copy_from,
 148         write8: bcm947xx_map_write8,
 149         write16: bcm947xx_map_write16,
 150         write32: bcm947xx_map_write32,
 151         copy_to: bcm947xx_map_copy_to
 152 };
 153
 154 #ifdef CONFIG_MTD_PARTITIONS
 155
 156 static struct mtd_partition bcm947xx_parts[] = {
 157         { name: "cfe",  offset: 0, size: 0, mask_flags: MTD_WRITEABLE, },
 158         { name: "linux", offset: 0, size: 0, },
 159         { name: "rootfs", offset: 0, size: 0, },
 160         { name: "nvram", offset: 0, size: 0, },
 161         { name: NULL, },
 162 };
 163
 164 static int __init
 165 find_cfe_size(struct mtd_info *mtd, size_t size)
 166 {
 167         struct trx_header *trx;
 168         unsigned char buf[512];
 169         int off;
 170         size_t len;
 171         int blocksize;
 172
 173         trx = (struct trx_header *) buf;
 174
 175         blocksize = mtd->erasesize;
 176         if (blocksize < 0x10000)
 177                 blocksize = 0x10000;
 178
 179         for (off = (128*1024); off < size; off += blocksize) {
 180                 memset(buf, 0xe5, sizeof(buf));
 181
 182                 /*
 183                  * Read into buffer
 184                  */
 185                 if (MTD_READ(mtd, off, sizeof(buf), &len, buf) ||
 186                     len != sizeof(buf))
 187                         continue;
 188
 189                 /* found a TRX header */
 190                 if (le32_to_cpu(trx->magic) == TRX_MAGIC) {
 191                         goto found;
 192                 }
 193         }
 194
 195         printk(KERN_NOTICE
 196                "%s: Couldn't find bootloader size\n",
 197                mtd->name);
 198         return -1;
 199
 200  found:
 201         printk(KERN_NOTICE "bootloader size: %d\n", off);
 202         return off;
 203
 204 }
 205
 206 /*
 207  * Copied from mtdblock.c
 208  *
 209  * Cache stuff...
 210  *
 211  * Since typical flash erasable sectors are much larger than what Linux's
 212  * buffer cache can handle, we must implement read-modify-write on flash
 213  * sectors for each block write requests.  To avoid over-erasing flash sectors
 214  * and to speed things up, we locally cache a whole flash sector while it is
 215  * being written to until a different sector is required.
 216  */
 217
 218 static void erase_callback(struct erase_info *done)
 219 {
 220         wait_queue_head_t *wait_q = (wait_queue_head_t *)done->priv;
 221         wake_up(wait_q);
 222 }
 223
 224 static int erase_write (struct mtd_info *mtd, unsigned long pos,
 225                         int len, const char *buf)
 226 {
 227         struct erase_info erase;
 228         DECLARE_WAITQUEUE(wait, current);
 229         wait_queue_head_t wait_q;
 230         size_t retlen;
 231         int ret;
 232
 233         /*
 234          * First, let's erase the flash block.
 235          */
 236
 237         init_waitqueue_head(&wait_q);
 238         erase.mtd = mtd;
 239         erase.callback = erase_callback;
 240         erase.addr = pos;
 241         erase.len = len;
 242         erase.priv = (u_long)&wait_q;
 243
 244         set_current_state(TASK_INTERRUPTIBLE);
 245         add_wait_queue(&wait_q, &wait);
 246
 247         ret = MTD_ERASE(mtd, &erase);
 248         if (ret) {
 249                 set_current_state(TASK_RUNNING);
 250                 remove_wait_queue(&wait_q, &wait);
 251                 printk (KERN_WARNING "erase of region [0x%lx, 0x%x] "
 252                                      "on \"%s\" failed\n",
 253                         pos, len, mtd->name);
 254                 return ret;
 255         }
 256
 257         schedule();  /* Wait for erase to finish. */
 258         remove_wait_queue(&wait_q, &wait);
 259
 260         /*
 261          * Next, writhe data to flash.
 262          */
 263
 264         ret = MTD_WRITE (mtd, pos, len, &retlen, buf);
 265         if (ret)
 266                 return ret;
 267         if (retlen != len)
 268                 return -EIO;
 269         return 0;
 270 }
 271
 272
 273
 274
 275 static int __init
 276 find_root(struct mtd_info *mtd, size_t size, struct mtd_partition *part)
 277 {
 278         struct trx_header trx, *trx2;
 279         unsigned char buf[512], *block;
 280         int off, blocksize;
 281         u32 i, crc = ~0;
 282         size_t len;
 283         struct squashfs_super_block *sb = (struct squashfs_super_block *) buf;
 284
 285         blocksize = mtd->erasesize;
 286         if (blocksize < 0x10000)
 287                 blocksize = 0x10000;
 288
 289         for (off = (128*1024); off < size; off += blocksize) {
 290                 memset(&trx, 0xe5, sizeof(trx));
 291
 292                 /*
 293                  * Read into buffer
 294                  */
 295                 if (MTD_READ(mtd, off, sizeof(trx), &len, (char *) &trx) ||
 296                     len != sizeof(trx))
 297                         continue;
 298
 299                 /* found a TRX header */
 300                 if (le32_to_cpu(trx.magic) == TRX_MAGIC) {
 301                         part->offset = le32_to_cpu(trx.offsets[2]) ? :
 302                                 le32_to_cpu(trx.offsets[1]);
 303                         part->size = le32_to_cpu(trx.len);
 304
 305                         part->size -= part->offset;
 306                         part->offset += off;
 307
 308                         goto found;
 309                 }
 310         }
 311
 312         printk(KERN_NOTICE
 313                "%s: Couldn't find root filesystem\n",
 314                mtd->name);
 315         return -1;
 316
 317  found:
 318         if (part->size == 0)
 319                 return 0;
 320
 321         if (MTD_READ(mtd, part->offset, sizeof(buf), &len, buf) || len != sizeof(buf))
 322                 return 0;
 323
 324         /* Move the filesystem outside of the trx */
 325         part->size = 0;
 326
 327         if (trx.len != part->offset + part->size - off) {
 328                 /* Update the trx offsets and length */
 329                 trx.len = part->offset + part->size - off;
 330
 331                 /* Update the trx crc32 */
 332                 for (i = (u32) &(((struct trx_header *)NULL)->flag_version); i <= trx.len; i += sizeof(buf)) {
 333                         if (MTD_READ(mtd, off + i, sizeof(buf), &len, buf) || len != sizeof(buf))
 334                                 return 0;
 335                         crc = crc32_le(crc, buf, min(sizeof(buf), trx.len - i));
 336                 }
 337                 trx.crc32 = crc;
 338
 339                 /* read first eraseblock from the trx */
 340                 trx2 = block = kmalloc(mtd->erasesize, GFP_KERNEL);
 341                 if (MTD_READ(mtd, off, mtd->erasesize, &len, block) || len != mtd->erasesize) {
 342                         printk("Error accessing the first trx eraseblock\n");
 343                         return 0;
 344                 }
 345
 346                 printk("Updating TRX offsets and length:\n");
 347                 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);
 348                 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);
 349
 350                 /* Write updated trx header to the flash */
 351                 memcpy(block, &trx, sizeof(trx));
 352                 if (mtd->unlock)
 353                         mtd->unlock(mtd, off, mtd->erasesize);
 354                 erase_write(mtd, off, mtd->erasesize, block);
 355                 if (mtd->sync)
 356                         mtd->sync(mtd);
 357                 kfree(block);
 358                 printk("Done\n");
 359         }
 360
 361         return part->size;
 362 }
 363
 364 struct mtd_partition * __init
 365 init_mtd_partitions(struct mtd_info *mtd, size_t size)
 366 {
 367         int cfe_size;
 368
 369         if ((cfe_size = find_cfe_size(mtd,size)) < 0)
 370                 return NULL;
 371
 372         /* boot loader */
 373         bcm947xx_parts[0].offset = 0;
 374         bcm947xx_parts[0].size   = cfe_size;
 375
 376         /* nvram */
 377         if (cfe_size != 384 * 1024) {
 378                 bcm947xx_parts[3].offset = size - ROUNDUP(NVRAM_SPACE, mtd->erasesize);
 379                 bcm947xx_parts[3].size   = ROUNDUP(NVRAM_SPACE, mtd->erasesize);
 380         } else {
 381                 /* nvram (old 128kb config partition on netgear wgt634u) */
 382                 bcm947xx_parts[3].offset = bcm947xx_parts[0].size;
 383                 bcm947xx_parts[3].size   = ROUNDUP(NVRAM_SPACE, mtd->erasesize);
 384         }
 385
 386         /* linux (kernel and rootfs) */
 387         if (cfe_size != 384 * 1024) {
 388                 bcm947xx_parts[1].offset = bcm947xx_parts[0].size;
 389                 bcm947xx_parts[1].size   = bcm947xx_parts[3].offset -
 390                         bcm947xx_parts[1].offset;
 391         } else {
 392                 /* do not count the elf loader, which is on one block */
 393                 bcm947xx_parts[1].offset = bcm947xx_parts[0].size +
 394                         bcm947xx_parts[3].size + mtd->erasesize;
 395                 bcm947xx_parts[1].size   = size -
 396                         bcm947xx_parts[0].size -
 397                         (2*bcm947xx_parts[3].size) -
 398                         mtd->erasesize;
 399         }
 400
 401         find_root(mtd,size,&bcm947xx_parts[2]);
 402         bcm947xx_parts[2].size = size - bcm947xx_parts[2].offset - bcm947xx_parts[3].size;
 403
 404         return bcm947xx_parts;
 405 }
 406
 407 #endif
 408
 409
 410 mod_init_t init_bcm947xx_map(void)
 411 {
 412         ulong flags;
 413         uint coreidx;
 414         chipcregs_t *cc;
 415         uint32 fltype;
 416         uint window_addr = 0, window_size = 0;
 417         size_t size;
 418         int ret = 0;
 419 #ifdef CONFIG_MTD_PARTITIONS
 420         struct mtd_partition *parts;
 421         int i;
 422 #endif
 423
 424         spin_lock_irqsave(&sbh_lock, flags);
 425         coreidx = sb_coreidx(sbh);
 426
 427         /* Check strapping option if chipcommon exists */
 428         if ((cc = sb_setcore(sbh, SB_CC, 0))) {
 429                 fltype = readl(&cc->capabilities) & CAP_FLASH_MASK;
 430                 if (fltype == PFLASH) {
 431                         bcm947xx_map.map_priv_2 = 1;
 432                         window_addr = 0x1c000000;
 433                         bcm947xx_map.size = window_size = 32 * 1024 * 1024;
 434                         if ((readl(&cc->flash_config) & CC_CFG_DS) == 0)
 435                                 bcm947xx_map.buswidth = 1;
 436                 }
 437         } else {
 438                 fltype = PFLASH;
 439                 bcm947xx_map.map_priv_2 = 0;
 440                 window_addr = WINDOW_ADDR;
 441                 window_size = WINDOW_SIZE;
 442         }
 443
 444         sb_setcoreidx(sbh, coreidx);
 445         spin_unlock_irqrestore(&sbh_lock, flags);
 446
 447         if (fltype != PFLASH) {
 448                 printk(KERN_ERR "pflash: found no supported devices\n");
 449                 ret = -ENODEV;
 450                 goto fail;
 451         }
 452
 453         bcm947xx_map.map_priv_1 = (unsigned long) ioremap(window_addr, window_size);
 454
 455         if (!bcm947xx_map.map_priv_1) {
 456                 printk(KERN_ERR "Failed to ioremap\n");
 457                 return -EIO;
 458         }
 459
 460         if (!(bcm947xx_mtd = do_map_probe("cfi_probe", &bcm947xx_map))) {
 461                 printk(KERN_ERR "pflash: cfi_probe failed\n");
 462                 iounmap((void *)bcm947xx_map.map_priv_1);
 463                 return -ENXIO;
 464         }
 465
 466         bcm947xx_mtd->module = THIS_MODULE;
 467
 468         size = bcm947xx_mtd->size;
 469
 470         printk(KERN_NOTICE "Flash device: 0x%x at 0x%x\n", size, window_addr);
 471
 472 #ifdef CONFIG_MTD_PARTITIONS
 473         parts = init_mtd_partitions(bcm947xx_mtd, size);
 474         for (i = 0; parts[i].name; i++);
 475         ret = add_mtd_partitions(bcm947xx_mtd, parts, i);
 476         if (ret) {
 477                 printk(KERN_ERR "Flash: add_mtd_partitions failed\n");
 478                 goto fail;
 479         }
 480 #endif
 481
 482         return 0;
 483
 484  fail:
 485         if (bcm947xx_mtd)
 486                 map_destroy(bcm947xx_mtd);
 487         if (bcm947xx_map.map_priv_1)
 488                 iounmap((void *) bcm947xx_map.map_priv_1);
 489         bcm947xx_map.map_priv_1 = 0;
 490         return ret;
 491 }
 492
 493 mod_exit_t cleanup_bcm947xx_map(void)
 494 {
 495 #ifdef CONFIG_MTD_PARTITIONS
 496         del_mtd_partitions(bcm947xx_mtd);
 497 #endif
 498         map_destroy(bcm947xx_mtd);
 499         iounmap((void *) bcm947xx_map.map_priv_1);
 500         bcm947xx_map.map_priv_1 = 0;
 501 }
 502
 503 module_init(init_bcm947xx_map);
 504 module_exit(cleanup_bcm947xx_map);