drivers/mtd/maps/nettel.c

   1 /****************************************************************************/
   2
   3 /*
   4  *      nettel.c -- mappings for NETtel/SecureEdge/SnapGear (x86) boards.
   5  *
   6  *      (C) Copyright 2000-2001, Greg Ungerer (gerg@snapgear.com)
   7  *      (C) Copyright 2001-2002, SnapGear (www.snapgear.com)
   8  *
   9  *      $Id: nettel.c,v 1.12 2005/11/29 14:30:00 gleixner Exp $
  10  */
  11
  12 /****************************************************************************/
  13
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/types.h>
  17 #include <linux/kernel.h>
  18 #include <linux/mtd/mtd.h>
  19 #include <linux/mtd/map.h>
  20 #include <linux/mtd/partitions.h>
  21 #include <linux/mtd/cfi.h>
  22 #include <linux/reboot.h>
  23 #include <linux/kdev_t.h>
  24 #include <linux/root_dev.h>
  25 #include <asm/io.h>
  26
  27 /****************************************************************************/
  28
  29 #define INTEL_BUSWIDTH          1
  30 #define AMD_WINDOW_MAXSIZE      0x00200000
  31 #define AMD_BUSWIDTH            1
  32
  33 /*
  34  *      PAR masks and shifts, assuming 64K pages.
  35  */
  36 #define SC520_PAR_ADDR_MASK     0x00003fff
  37 #define SC520_PAR_ADDR_SHIFT    16
  38 #define SC520_PAR_TO_ADDR(par) \
  39         (((par)&SC520_PAR_ADDR_MASK) << SC520_PAR_ADDR_SHIFT)
  40
  41 #define SC520_PAR_SIZE_MASK     0x01ffc000
  42 #define SC520_PAR_SIZE_SHIFT    2
  43 #define SC520_PAR_TO_SIZE(par) \
  44         ((((par)&SC520_PAR_SIZE_MASK) << SC520_PAR_SIZE_SHIFT) + (64*1024))
  45
  46 #define SC520_PAR(cs, addr, size) \
  47         ((cs) | \
  48         ((((size)-(64*1024)) >> SC520_PAR_SIZE_SHIFT) & SC520_PAR_SIZE_MASK) | \
  49         (((addr) >> SC520_PAR_ADDR_SHIFT) & SC520_PAR_ADDR_MASK))
  50
  51 #define SC520_PAR_BOOTCS        0x8a000000
  52 #define SC520_PAR_ROMCS1        0xaa000000
  53 #define SC520_PAR_ROMCS2        0xca000000      /* Cache disabled, 64K page */
  54
  55 static void *nettel_mmcrp = NULL;
  56
  57 #ifdef CONFIG_MTD_CFI_INTELEXT
  58 static struct mtd_info *intel_mtd;
  59 #endif
  60 static struct mtd_info *amd_mtd;
  61
  62 /****************************************************************************/
  63
  64 /****************************************************************************/
  65
  66 #ifdef CONFIG_MTD_CFI_INTELEXT
  67 static struct map_info nettel_intel_map = {
  68         .name = "SnapGear Intel",
  69         .size = 0,
  70         .bankwidth = INTEL_BUSWIDTH,
  71 };
  72
  73 static struct mtd_partition nettel_intel_partitions[] = {
  74         {
  75                 .name = "SnapGear kernel",
  76                 .offset = 0,
  77                 .size = 0x000e0000
  78         },
  79         {
  80                 .name = "SnapGear filesystem",
  81                 .offset = 0x00100000,
  82         },
  83         {
  84                 .name = "SnapGear config",
  85                 .offset = 0x000e0000,
  86                 .size = 0x00020000
  87         },
  88         {
  89                 .name = "SnapGear Intel",
  90                 .offset = 0
  91         },
  92         {
  93                 .name = "SnapGear BIOS Config",
  94                 .offset = 0x007e0000,
  95                 .size = 0x00020000
  96         },
  97         {
  98                 .name = "SnapGear BIOS",
  99                 .offset = 0x007e0000,
 100                 .size = 0x00020000
 101         },
 102 };
 103 #endif
 104
 105 static struct map_info nettel_amd_map = {
 106         .name = "SnapGear AMD",
 107         .size = AMD_WINDOW_MAXSIZE,
 108         .bankwidth = AMD_BUSWIDTH,
 109 };
 110
 111 static struct mtd_partition nettel_amd_partitions[] = {
 112         {
 113                 .name = "SnapGear BIOS config",
 114                 .offset = 0x000e0000,
 115                 .size = 0x00010000
 116         },
 117         {
 118                 .name = "SnapGear BIOS",
 119                 .offset = 0x000f0000,
 120                 .size = 0x00010000
 121         },
 122         {
 123                 .name = "SnapGear AMD",
 124                 .offset = 0
 125         },
 126         {
 127                 .name = "SnapGear high BIOS",
 128                 .offset = 0x001f0000,
 129                 .size = 0x00010000
 130         }
 131 };
 132
 133 #define NUM_AMD_PARTITIONS ARRAY_SIZE(nettel_amd_partitions)
 134
 135 /****************************************************************************/
 136
 137 #ifdef CONFIG_MTD_CFI_INTELEXT
 138
 139 /*
 140  *      Set the Intel flash back to read mode since some old boot
 141  *      loaders don't.
 142  */
 143 static int nettel_reboot_notifier(struct notifier_block *nb, unsigned long val, void *v)
 144 {
 145         struct cfi_private *cfi = nettel_intel_map.fldrv_priv;
 146         unsigned long b;
 147
 148         /* Make sure all FLASH chips are put back into read mode */
 149         for (b = 0; (b < nettel_intel_partitions[3].size); b += 0x100000) {
 150                 cfi_send_gen_cmd(0xff, 0x55, b, &nettel_intel_map, cfi,
 151                         cfi->device_type, NULL);
 152         }
 153         return(NOTIFY_OK);
 154 }
 155
 156 static struct notifier_block nettel_notifier_block = {
 157         nettel_reboot_notifier, NULL, 0
 158 };
 159
 160 /*
 161  *      Erase the configuration file system.
 162  *      Used to support the software reset button.
 163  */
 164 static void nettel_erasecallback(struct erase_info *done)
 165 {
 166         wait_queue_head_t *wait_q = (wait_queue_head_t *)done->priv;
 167         wake_up(wait_q);
 168 }
 169
 170 static struct erase_info nettel_erase;
 171
 172 int nettel_eraseconfig(void)
 173 {
 174         struct mtd_info *mtd;
 175         DECLARE_WAITQUEUE(wait, current);
 176         wait_queue_head_t wait_q;
 177         int ret;
 178
 179         init_waitqueue_head(&wait_q);
 180         mtd = get_mtd_device(NULL, 2);
 181         if (mtd) {
 182                 nettel_erase.mtd = mtd;
 183                 nettel_erase.callback = nettel_erasecallback;
 184                 nettel_erase.callback = NULL;
 185                 nettel_erase.addr = 0;
 186                 nettel_erase.len = mtd->size;
 187                 nettel_erase.priv = (u_long) &wait_q;
 188                 nettel_erase.priv = 0;
 189
 190                 set_current_state(TASK_INTERRUPTIBLE);
 191                 add_wait_queue(&wait_q, &wait);
 192
 193                 ret = mtd->erase(mtd, &nettel_erase);
 194                 if (ret) {
 195                         set_current_state(TASK_RUNNING);
 196                         remove_wait_queue(&wait_q, &wait);
 197                         put_mtd_device(mtd);
 198                         return(ret);
 199                 }
 200
 201                 schedule();  /* Wait for erase to finish. */
 202                 remove_wait_queue(&wait_q, &wait);
 203
 204                 put_mtd_device(mtd);
 205         }
 206
 207         return(0);
 208 }
 209
 210 #else
 211
 212 int nettel_eraseconfig(void)
 213 {
 214         return(0);
 215 }
 216
 217 #endif
 218
 219 /****************************************************************************/
 220
 221 int __init nettel_init(void)
 222 {
 223         volatile unsigned long *amdpar;
 224         unsigned long amdaddr, maxsize;
 225         int num_amd_partitions=0;
 226 #ifdef CONFIG_MTD_CFI_INTELEXT
 227         volatile unsigned long *intel0par, *intel1par;
 228         unsigned long orig_bootcspar, orig_romcs1par;
 229         unsigned long intel0addr, intel0size;
 230         unsigned long intel1addr, intel1size;
 231         int intelboot, intel0cs, intel1cs;
 232         int num_intel_partitions;
 233 #endif
 234         int rc = 0;
 235
 236         nettel_mmcrp = (void *) ioremap_nocache(0xfffef000, 4096);
 237         if (nettel_mmcrp == NULL) {
 238                 printk("SNAPGEAR: failed to disable MMCR cache??\n");
 239                 return(-EIO);
 240         }
 241
 242         /* Set CPU clock to be 33.000MHz */
 243         *((unsigned char *) (nettel_mmcrp + 0xc64)) = 0x01;
 244
 245         amdpar = (volatile unsigned long *) (nettel_mmcrp + 0xc4);
 246
 247 #ifdef CONFIG_MTD_CFI_INTELEXT
 248         intelboot = 0;
 249         intel0cs = SC520_PAR_ROMCS1;
 250         intel0par = (volatile unsigned long *) (nettel_mmcrp + 0xc0);
 251         intel1cs = SC520_PAR_ROMCS2;
 252         intel1par = (volatile unsigned long *) (nettel_mmcrp + 0xbc);
 253
 254         /*
 255          *      Save the CS settings then ensure ROMCS1 and ROMCS2 are off,
 256          *      otherwise they might clash with where we try to map BOOTCS.
 257          */
 258         orig_bootcspar = *amdpar;
 259         orig_romcs1par = *intel0par;
 260         *intel0par = 0;
 261         *intel1par = 0;
 262 #endif
 263
 264         /*
 265          *      The first thing to do is determine if we have a separate
 266          *      boot FLASH device. Typically this is a small (1 to 2MB)
 267          *      AMD FLASH part. It seems that device size is about the
 268          *      only way to tell if this is the case...
 269          */
 270         amdaddr = 0x20000000;
 271         maxsize = AMD_WINDOW_MAXSIZE;
 272
 273         *amdpar = SC520_PAR(SC520_PAR_BOOTCS, amdaddr, maxsize);
 274         __asm__ ("wbinvd");
 275
 276         nettel_amd_map.phys = amdaddr;
 277         nettel_amd_map.virt = ioremap_nocache(amdaddr, maxsize);
 278         if (!nettel_amd_map.virt) {
 279                 printk("SNAPGEAR: failed to ioremap() BOOTCS\n");
 280                 return(-EIO);
 281         }
 282         simple_map_init(&nettel_amd_map);
 283
 284         if ((amd_mtd = do_map_probe("jedec_probe", &nettel_amd_map))) {
 285                 printk(KERN_NOTICE "SNAPGEAR: AMD flash device size = %dK\n",
 286                         amd_mtd->size>>10);
 287
 288                 amd_mtd->owner = THIS_MODULE;
 289
 290                 /* The high BIOS partition is only present for 2MB units */
 291                 num_amd_partitions = NUM_AMD_PARTITIONS;
 292                 if (amd_mtd->size < AMD_WINDOW_MAXSIZE)
 293                         num_amd_partitions--;
 294                 /* Don't add the partition until after the primary INTEL's */
 295
 296 #ifdef CONFIG_MTD_CFI_INTELEXT
 297                 /*
 298                  *      Map the Intel flash into memory after the AMD
 299                  *      It has to start on a multiple of maxsize.
 300                  */
 301                 maxsize = SC520_PAR_TO_SIZE(orig_romcs1par);
 302                 if (maxsize < (32 * 1024 * 1024))
 303                         maxsize = (32 * 1024 * 1024);
 304                 intel0addr = amdaddr + maxsize;
 305 #endif
 306         } else {
 307 #ifdef CONFIG_MTD_CFI_INTELEXT
 308                 /* INTEL boot FLASH */
 309                 intelboot++;
 310
 311                 if (!orig_romcs1par) {
 312                         intel0cs = SC520_PAR_BOOTCS;
 313                         intel0par = (volatile unsigned long *)
 314                                 (nettel_mmcrp + 0xc4);
 315                         intel1cs = SC520_PAR_ROMCS1;
 316                         intel1par = (volatile unsigned long *)
 317                                 (nettel_mmcrp + 0xc0);
 318
 319                         intel0addr = SC520_PAR_TO_ADDR(orig_bootcspar);
 320                         maxsize = SC520_PAR_TO_SIZE(orig_bootcspar);
 321                 } else {
 322                         /* Kernel base is on ROMCS1, not BOOTCS */
 323                         intel0cs = SC520_PAR_ROMCS1;
 324                         intel0par = (volatile unsigned long *)
 325                                 (nettel_mmcrp + 0xc0);
 326                         intel1cs = SC520_PAR_BOOTCS;
 327                         intel1par = (volatile unsigned long *)
 328                                 (nettel_mmcrp + 0xc4);
 329
 330                         intel0addr = SC520_PAR_TO_ADDR(orig_romcs1par);
 331                         maxsize = SC520_PAR_TO_SIZE(orig_romcs1par);
 332                 }
 333
 334                 /* Destroy useless AMD MTD mapping */
 335                 amd_mtd = NULL;
 336                 iounmap(nettel_amd_map.virt);
 337                 nettel_amd_map.virt = NULL;
 338 #else
 339                 /* Only AMD flash supported */
 340                 return(-ENXIO);
 341 #endif
 342         }
 343
 344 #ifdef CONFIG_MTD_CFI_INTELEXT
 345         /*
 346          *      We have determined the INTEL FLASH configuration, so lets
 347          *      go ahead and probe for them now.
 348          */
 349
 350         /* Set PAR to the maximum size */
 351         if (maxsize < (32 * 1024 * 1024))
 352                 maxsize = (32 * 1024 * 1024);
 353         *intel0par = SC520_PAR(intel0cs, intel0addr, maxsize);
 354
 355         /* Turn other PAR off so the first probe doesn't find it */
 356         *intel1par = 0;
 357
 358         /* Probe for the the size of the first Intel flash */
 359         nettel_intel_map.size = maxsize;
 360         nettel_intel_map.phys = intel0addr;
 361         nettel_intel_map.virt = ioremap_nocache(intel0addr, maxsize);
 362         if (!nettel_intel_map.virt) {
 363                 printk("SNAPGEAR: failed to ioremap() ROMCS1\n");
 364                 return(-EIO);
 365         }
 366         simple_map_init(&nettel_intel_map);
 367
 368         intel_mtd = do_map_probe("cfi_probe", &nettel_intel_map);
 369         if (!intel_mtd) {
 370                 iounmap(nettel_intel_map.virt);
 371                 return(-ENXIO);
 372         }
 373
 374         /* Set PAR to the detected size */
 375         intel0size = intel_mtd->size;
 376         *intel0par = SC520_PAR(intel0cs, intel0addr, intel0size);
 377
 378         /*
 379          *      Map second Intel FLASH right after first. Set its size to the
 380          *      same maxsize used for the first Intel FLASH.
 381          */
 382         intel1addr = intel0addr + intel0size;
 383         *intel1par = SC520_PAR(intel1cs, intel1addr, maxsize);
 384         __asm__ ("wbinvd");
 385
 386         maxsize += intel0size;
 387
 388         /* Delete the old map and probe again to do both chips */
 389         map_destroy(intel_mtd);
 390         intel_mtd = NULL;
 391         iounmap(nettel_intel_map.virt);
 392
 393         nettel_intel_map.size = maxsize;
 394         nettel_intel_map.virt = ioremap_nocache(intel0addr, maxsize);
 395         if (!nettel_intel_map.virt) {
 396                 printk("SNAPGEAR: failed to ioremap() ROMCS1/2\n");
 397                 return(-EIO);
 398         }
 399
 400         intel_mtd = do_map_probe("cfi_probe", &nettel_intel_map);
 401         if (! intel_mtd) {
 402                 iounmap((void *) nettel_intel_map.virt);
 403                 return(-ENXIO);
 404         }
 405
 406         intel1size = intel_mtd->size - intel0size;
 407         if (intel1size > 0) {
 408                 *intel1par = SC520_PAR(intel1cs, intel1addr, intel1size);
 409                 __asm__ ("wbinvd");
 410         } else {
 411                 *intel1par = 0;
 412         }
 413
 414         printk(KERN_NOTICE "SNAPGEAR: Intel flash device size = %dK\n",
 415                 (intel_mtd->size >> 10));
 416
 417         intel_mtd->owner = THIS_MODULE;
 418
 419 #ifndef CONFIG_BLK_DEV_INITRD
 420         ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, 1);
 421 #endif
 422
 423         num_intel_partitions = sizeof(nettel_intel_partitions) /
 424                 sizeof(nettel_intel_partitions[0]);
 425
 426         if (intelboot) {
 427                 /*
 428                  *      Adjust offset and size of last boot partition.
 429                  *      Must allow for BIOS region at end of FLASH.
 430                  */
 431                 nettel_intel_partitions[1].size = (intel0size + intel1size) -
 432                         (1024*1024 + intel_mtd->erasesize);
 433                 nettel_intel_partitions[3].size = intel0size + intel1size;
 434                 nettel_intel_partitions[4].offset =
 435                         (intel0size + intel1size) - intel_mtd->erasesize;
 436                 nettel_intel_partitions[4].size = intel_mtd->erasesize;
 437                 nettel_intel_partitions[5].offset =
 438                         nettel_intel_partitions[4].offset;
 439                 nettel_intel_partitions[5].size =
 440                         nettel_intel_partitions[4].size;
 441         } else {
 442                 /* No BIOS regions when AMD boot */
 443                 num_intel_partitions -= 2;
 444         }
 445         rc = add_mtd_partitions(intel_mtd, nettel_intel_partitions,
 446                 num_intel_partitions);
 447 #endif
 448
 449         if (amd_mtd) {
 450                 rc = add_mtd_partitions(amd_mtd, nettel_amd_partitions,
 451                         num_amd_partitions);
 452         }
 453
 454 #ifdef CONFIG_MTD_CFI_INTELEXT
 455         register_reboot_notifier(&nettel_notifier_block);
 456 #endif
 457
 458         return(rc);
 459 }
 460
 461 /****************************************************************************/
 462
 463 void __exit nettel_cleanup(void)
 464 {
 465 #ifdef CONFIG_MTD_CFI_INTELEXT
 466         unregister_reboot_notifier(&nettel_notifier_block);
 467 #endif
 468         if (amd_mtd) {
 469                 del_mtd_partitions(amd_mtd);
 470                 map_destroy(amd_mtd);
 471         }
 472         if (nettel_amd_map.virt) {
 473                 iounmap(nettel_amd_map.virt);
 474                 nettel_amd_map.virt = NULL;
 475         }
 476 #ifdef CONFIG_MTD_CFI_INTELEXT
 477         if (intel_mtd) {
 478                 del_mtd_partitions(intel_mtd);
 479                 map_destroy(intel_mtd);
 480         }
 481         if (nettel_intel_map.virt) {
 482                 iounmap(nettel_intel_map.virt);
 483                 nettel_intel_map.virt = NULL;
 484         }
 485 #endif
 486 }
 487
 488 /****************************************************************************/
 489
 490 module_init(nettel_init);
 491 module_exit(nettel_cleanup);
 492
 493 MODULE_LICENSE("GPL");
 494 MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>");
 495 MODULE_DESCRIPTION("SnapGear/SecureEdge FLASH support");
 496
 497 /****************************************************************************/