drivers/mtd/maps/esb2rom.c

   1 /*
   2  * esb2rom.c
   3  *
   4  * Normal mappings of flash chips in physical memory
   5  * through the Intel ESB2 Southbridge.
   6  *
   7  * This was derived from ichxrom.c in May 2006 by
   8  *      Lew Glendenning <lglendenning@lnxi.com>
   9  *
  10  * Eric Biederman, of course, was a major help in this effort.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/types.h>
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/slab.h>
  18 #include <asm/io.h>
  19 #include <linux/mtd/mtd.h>
  20 #include <linux/mtd/map.h>
  21 #include <linux/mtd/cfi.h>
  22 #include <linux/mtd/flashchip.h>
  23 #include <linux/pci.h>
  24 #include <linux/pci_ids.h>
  25 #include <linux/list.h>
  26
  27 #define MOD_NAME KBUILD_BASENAME
  28
  29 #define ADDRESS_NAME_LEN 18
  30
  31 #define ROM_PROBE_STEP_SIZE (64*1024) /* 64KiB */
  32
  33 #define BIOS_CNTL               0xDC
  34 #define BIOS_LOCK_ENABLE        0x02
  35 #define BIOS_WRITE_ENABLE       0x01
  36
  37 /* This became a 16-bit register, and EN2 has disappeared */
  38 #define FWH_DEC_EN1     0xD8
  39 #define FWH_F8_EN       0x8000
  40 #define FWH_F0_EN       0x4000
  41 #define FWH_E8_EN       0x2000
  42 #define FWH_E0_EN       0x1000
  43 #define FWH_D8_EN       0x0800
  44 #define FWH_D0_EN       0x0400
  45 #define FWH_C8_EN       0x0200
  46 #define FWH_C0_EN       0x0100
  47 #define FWH_LEGACY_F_EN 0x0080
  48 #define FWH_LEGACY_E_EN 0x0040
  49 /* reserved  0x0020 and 0x0010 */
  50 #define FWH_70_EN       0x0008
  51 #define FWH_60_EN       0x0004
  52 #define FWH_50_EN       0x0002
  53 #define FWH_40_EN       0x0001
  54
  55 /* these are 32-bit values */
  56 #define FWH_SEL1        0xD0
  57 #define FWH_SEL2        0xD4
  58
  59 #define FWH_8MiB        (FWH_F8_EN | FWH_F0_EN | FWH_E8_EN | FWH_E0_EN | \
  60                          FWH_D8_EN | FWH_D0_EN | FWH_C8_EN | FWH_C0_EN | \
  61                          FWH_70_EN | FWH_60_EN | FWH_50_EN | FWH_40_EN)
  62
  63 #define FWH_7MiB        (FWH_F8_EN | FWH_F0_EN | FWH_E8_EN | FWH_E0_EN | \
  64                          FWH_D8_EN | FWH_D0_EN | FWH_C8_EN | FWH_C0_EN | \
  65                          FWH_70_EN | FWH_60_EN | FWH_50_EN)
  66
  67 #define FWH_6MiB        (FWH_F8_EN | FWH_F0_EN | FWH_E8_EN | FWH_E0_EN | \
  68                          FWH_D8_EN | FWH_D0_EN | FWH_C8_EN | FWH_C0_EN | \
  69                          FWH_70_EN | FWH_60_EN)
  70
  71 #define FWH_5MiB        (FWH_F8_EN | FWH_F0_EN | FWH_E8_EN | FWH_E0_EN | \
  72                          FWH_D8_EN | FWH_D0_EN | FWH_C8_EN | FWH_C0_EN | \
  73                          FWH_70_EN)
  74
  75 #define FWH_4MiB        (FWH_F8_EN | FWH_F0_EN | FWH_E8_EN | FWH_E0_EN | \
  76                          FWH_D8_EN | FWH_D0_EN | FWH_C8_EN | FWH_C0_EN)
  77
  78 #define FWH_3_5MiB      (FWH_F8_EN | FWH_F0_EN | FWH_E8_EN | FWH_E0_EN | \
  79                          FWH_D8_EN | FWH_D0_EN | FWH_C8_EN)
  80
  81 #define FWH_3MiB        (FWH_F8_EN | FWH_F0_EN | FWH_E8_EN | FWH_E0_EN | \
  82                          FWH_D8_EN | FWH_D0_EN)
  83
  84 #define FWH_2_5MiB      (FWH_F8_EN | FWH_F0_EN | FWH_E8_EN | FWH_E0_EN | \
  85                          FWH_D8_EN)
  86
  87 #define FWH_2MiB        (FWH_F8_EN | FWH_F0_EN | FWH_E8_EN | FWH_E0_EN)
  88
  89 #define FWH_1_5MiB      (FWH_F8_EN | FWH_F0_EN | FWH_E8_EN)
  90
  91 #define FWH_1MiB        (FWH_F8_EN | FWH_F0_EN)
  92
  93 #define FWH_0_5MiB      (FWH_F8_EN)
  94
  95
  96 struct esb2rom_window {
  97         void __iomem* virt;
  98         unsigned long phys;
  99         unsigned long size;
 100         struct list_head maps;
 101         struct resource rsrc;
 102         struct pci_dev *pdev;
 103 };
 104
 105 struct esb2rom_map_info {
 106         struct list_head list;
 107         struct map_info map;
 108         struct mtd_info *mtd;
 109         struct resource rsrc;
 110         char map_name[sizeof(MOD_NAME) + 2 + ADDRESS_NAME_LEN];
 111 };
 112
 113 static struct esb2rom_window esb2rom_window = {
 114         .maps = LIST_HEAD_INIT(esb2rom_window.maps),
 115 };
 116
 117 static void esb2rom_cleanup(struct esb2rom_window *window)
 118 {
 119         struct esb2rom_map_info *map, *scratch;
 120         u8 byte;
 121
 122         /* Disable writes through the rom window */
 123         pci_read_config_byte(window->pdev, BIOS_CNTL, &byte);
 124         pci_write_config_byte(window->pdev, BIOS_CNTL,
 125                 byte & ~BIOS_WRITE_ENABLE);
 126
 127         /* Free all of the mtd devices */
 128         list_for_each_entry_safe(map, scratch, &window->maps, list) {
 129                 if (map->rsrc.parent)
 130                         release_resource(&map->rsrc);
 131                 mtd_device_unregister(map->mtd);
 132                 map_destroy(map->mtd);
 133                 list_del(&map->list);
 134                 kfree(map);
 135         }
 136         if (window->rsrc.parent)
 137                 release_resource(&window->rsrc);
 138         if (window->virt) {
 139                 iounmap(window->virt);
 140                 window->virt = NULL;
 141                 window->phys = 0;
 142                 window->size = 0;
 143         }
 144         pci_dev_put(window->pdev);
 145 }
 146
 147 static int __init esb2rom_init_one(struct pci_dev *pdev,
 148                                    const struct pci_device_id *ent)
 149 {
 150         static char *rom_probe_types[] = { "cfi_probe", "jedec_probe", NULL };
 151         struct esb2rom_window *window = &esb2rom_window;
 152         struct esb2rom_map_info *map = NULL;
 153         unsigned long map_top;
 154         u8 byte;
 155         u16 word;
 156
 157         /* For now I just handle the ecb2 and I assume there
 158          * are not a lot of resources up at the top of the address
 159          * space.  It is possible to handle other devices in the
 160          * top 16MiB but it is very painful.  Also since
 161          * you can only really attach a FWH to an ICHX there
 162          * a number of simplifications you can make.
 163          *
 164          * Also you can page firmware hubs if an 8MiB window isn't enough
 165          * but don't currently handle that case either.
 166          */
 167         window->pdev = pci_dev_get(pdev);
 168
 169         /* RLG:  experiment 2.  Force the window registers to the widest values */
 170
 171 /*
 172         pci_read_config_word(pdev, FWH_DEC_EN1, &word);
 173         printk(KERN_DEBUG "Original FWH_DEC_EN1 : %x\n", word);
 174         pci_write_config_byte(pdev, FWH_DEC_EN1, 0xff);
 175         pci_read_config_byte(pdev, FWH_DEC_EN1, &byte);
 176         printk(KERN_DEBUG "New FWH_DEC_EN1 : %x\n", byte);
 177
 178         pci_read_config_byte(pdev, FWH_DEC_EN2, &byte);
 179         printk(KERN_DEBUG "Original FWH_DEC_EN2 : %x\n", byte);
 180         pci_write_config_byte(pdev, FWH_DEC_EN2, 0x0f);
 181         pci_read_config_byte(pdev, FWH_DEC_EN2, &byte);
 182         printk(KERN_DEBUG "New FWH_DEC_EN2 : %x\n", byte);
 183 */
 184
 185         /* Find a region continuous to the end of the ROM window  */
 186         window->phys = 0;
 187         pci_read_config_word(pdev, FWH_DEC_EN1, &word);
 188         printk(KERN_DEBUG "pci_read_config_word : %x\n", word);
 189
 190         if ((word & FWH_8MiB) == FWH_8MiB)
 191                 window->phys = 0xff400000;
 192         else if ((word & FWH_7MiB) == FWH_7MiB)
 193                 window->phys = 0xff500000;
 194         else if ((word & FWH_6MiB) == FWH_6MiB)
 195                 window->phys = 0xff600000;
 196         else if ((word & FWH_5MiB) == FWH_5MiB)
 197                 window->phys = 0xFF700000;
 198         else if ((word & FWH_4MiB) == FWH_4MiB)
 199                 window->phys = 0xffc00000;
 200         else if ((word & FWH_3_5MiB) == FWH_3_5MiB)
 201                 window->phys = 0xffc80000;
 202         else if ((word & FWH_3MiB) == FWH_3MiB)
 203                 window->phys = 0xffd00000;
 204         else if ((word & FWH_2_5MiB) == FWH_2_5MiB)
 205                 window->phys = 0xffd80000;
 206         else if ((word & FWH_2MiB) == FWH_2MiB)
 207                 window->phys = 0xffe00000;
 208         else if ((word & FWH_1_5MiB) == FWH_1_5MiB)
 209                 window->phys = 0xffe80000;
 210         else if ((word & FWH_1MiB) == FWH_1MiB)
 211                 window->phys = 0xfff00000;
 212         else if ((word & FWH_0_5MiB) == FWH_0_5MiB)
 213                 window->phys = 0xfff80000;
 214
 215         if (window->phys == 0) {
 216                 printk(KERN_ERR MOD_NAME ": Rom window is closed\n");
 217                 goto out;
 218         }
 219
 220         /* reserved  0x0020 and 0x0010 */
 221         window->phys -= 0x400000UL;
 222         window->size = (0xffffffffUL - window->phys) + 1UL;
 223
 224         /* Enable writes through the rom window */
 225         pci_read_config_byte(pdev, BIOS_CNTL, &byte);
 226         if (!(byte & BIOS_WRITE_ENABLE)  && (byte & (BIOS_LOCK_ENABLE))) {
 227                 /* The BIOS will generate an error if I enable
 228                  * this device, so don't even try.
 229                  */
 230                 printk(KERN_ERR MOD_NAME ": firmware access control, I can't enable writes\n");
 231                 goto out;
 232         }
 233         pci_write_config_byte(pdev, BIOS_CNTL, byte | BIOS_WRITE_ENABLE);
 234
 235         /*
 236          * Try to reserve the window mem region.  If this fails then
 237          * it is likely due to the window being "reserved" by the BIOS.
 238          */
 239         window->rsrc.name = MOD_NAME;
 240         window->rsrc.start = window->phys;
 241         window->rsrc.end   = window->phys + window->size - 1;
 242         window->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 243         if (request_resource(&iomem_resource, &window->rsrc)) {
 244                 window->rsrc.parent = NULL;
 245                 printk(KERN_DEBUG MOD_NAME ": "
 246                        "%s(): Unable to register resource %pR - kernel bug?\n",
 247                         __func__, &window->rsrc);
 248         }
 249
 250         /* Map the firmware hub into my address space. */
 251         window->virt = ioremap_nocache(window->phys, window->size);
 252         if (!window->virt) {
 253                 printk(KERN_ERR MOD_NAME ": ioremap(%08lx, %08lx) failed\n",
 254                         window->phys, window->size);
 255                 goto out;
 256         }
 257
 258         /* Get the first address to look for an rom chip at */
 259         map_top = window->phys;
 260         if ((window->phys & 0x3fffff) != 0) {
 261                 /* if not aligned on 4MiB, look 4MiB lower in address space */
 262                 map_top = window->phys + 0x400000;
 263         }
 264 #if 1
 265         /* The probe sequence run over the firmware hub lock
 266          * registers sets them to 0x7 (no access).
 267          * (Insane hardware design, but most copied Intel's.)
 268          * ==> Probe at most the last 4M of the address space.
 269          */
 270         if (map_top < 0xffc00000)
 271                 map_top = 0xffc00000;
 272 #endif
 273         /* Loop through and look for rom chips */
 274         while ((map_top - 1) < 0xffffffffUL) {
 275                 struct cfi_private *cfi;
 276                 unsigned long offset;
 277                 int i;
 278
 279                 if (!map)
 280                         map = kmalloc(sizeof(*map), GFP_KERNEL);
 281                 if (!map) {
 282                         printk(KERN_ERR MOD_NAME ": kmalloc failed");
 283                         goto out;
 284                 }
 285                 memset(map, 0, sizeof(*map));
 286                 INIT_LIST_HEAD(&map->list);
 287                 map->map.name = map->map_name;
 288                 map->map.phys = map_top;
 289                 offset = map_top - window->phys;
 290                 map->map.virt = (void __iomem *)
 291                         (((unsigned long)(window->virt)) + offset);
 292                 map->map.size = 0xffffffffUL - map_top + 1UL;
 293                 /* Set the name of the map to the address I am trying */
 294                 sprintf(map->map_name, "%s @%08Lx",
 295                         MOD_NAME, (unsigned long long)map->map.phys);
 296
 297                 /* Firmware hubs only use vpp when being programmed
 298                  * in a factory setting.  So in-place programming
 299                  * needs to use a different method.
 300                  */
 301                 for(map->map.bankwidth = 32; map->map.bankwidth;
 302                         map->map.bankwidth >>= 1) {
 303                         char **probe_type;
 304                         /* Skip bankwidths that are not supported */
 305                         if (!map_bankwidth_supported(map->map.bankwidth))
 306                                 continue;
 307
 308                         /* Setup the map methods */
 309                         simple_map_init(&map->map);
 310
 311                         /* Try all of the probe methods */
 312                         probe_type = rom_probe_types;
 313                         for(; *probe_type; probe_type++) {
 314                                 map->mtd = do_map_probe(*probe_type, &map->map);
 315                                 if (map->mtd)
 316                                         goto found;
 317                         }
 318                 }
 319                 map_top += ROM_PROBE_STEP_SIZE;
 320                 continue;
 321         found:
 322                 /* Trim the size if we are larger than the map */
 323                 if (map->mtd->size > map->map.size) {
 324                         printk(KERN_WARNING MOD_NAME
 325                                 " rom(%llu) larger than window(%lu). fixing...\n",
 326                                 (unsigned long long)map->mtd->size, map->map.size);
 327                         map->mtd->size = map->map.size;
 328                 }
 329                 if (window->rsrc.parent) {
 330                         /*
 331                          * Registering the MTD device in iomem may not be possible
 332                          * if there is a BIOS "reserved" and BUSY range.  If this
 333                          * fails then continue anyway.
 334                          */
 335                         map->rsrc.name  = map->map_name;
 336                         map->rsrc.start = map->map.phys;
 337                         map->rsrc.end   = map->map.phys + map->mtd->size - 1;
 338                         map->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 339                         if (request_resource(&window->rsrc, &map->rsrc)) {
 340                                 printk(KERN_ERR MOD_NAME
 341                                         ": cannot reserve MTD resource\n");
 342                                 map->rsrc.parent = NULL;
 343                         }
 344                 }
 345
 346                 /* Make the whole region visible in the map */
 347                 map->map.virt = window->virt;
 348                 map->map.phys = window->phys;
 349                 cfi = map->map.fldrv_priv;
 350                 for(i = 0; i < cfi->numchips; i++)
 351                         cfi->chips[i].start += offset;
 352
 353                 /* Now that the mtd devices is complete claim and export it */
 354                 map->mtd->owner = THIS_MODULE;
 355                 if (mtd_device_register(map->mtd, NULL, 0)) {
 356                         map_destroy(map->mtd);
 357                         map->mtd = NULL;
 358                         goto out;
 359                 }
 360
 361                 /* Calculate the new value of map_top */
 362                 map_top += map->mtd->size;
 363
 364                 /* File away the map structure */
 365                 list_add(&map->list, &window->maps);
 366                 map = NULL;
 367         }
 368
 369  out:
 370         /* Free any left over map structures */
 371         kfree(map);
 372
 373         /* See if I have any map structures */
 374         if (list_empty(&window->maps)) {
 375                 esb2rom_cleanup(window);
 376                 return -ENODEV;
 377         }
 378         return 0;
 379 }
 380
 381 static void esb2rom_remove_one(struct pci_dev *pdev)
 382 {
 383         struct esb2rom_window *window = &esb2rom_window;
 384         esb2rom_cleanup(window);
 385 }
 386
 387 static const struct pci_device_id esb2rom_pci_tbl[] = {
 388         { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0,
 389           PCI_ANY_ID, PCI_ANY_ID, },
 390         { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_0,
 391           PCI_ANY_ID, PCI_ANY_ID, },
 392         { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0,
 393           PCI_ANY_ID, PCI_ANY_ID, },
 394         { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0,
 395           PCI_ANY_ID, PCI_ANY_ID, },
 396         { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_1,
 397           PCI_ANY_ID, PCI_ANY_ID, },
 398         { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB2_0,
 399           PCI_ANY_ID, PCI_ANY_ID, },
 400         { 0, },
 401 };
 402
 403 #if 0
 404 MODULE_DEVICE_TABLE(pci, esb2rom_pci_tbl);
 405
 406 static struct pci_driver esb2rom_driver = {
 407         .name =         MOD_NAME,
 408         .id_table =     esb2rom_pci_tbl,
 409         .probe =        esb2rom_init_one,
 410         .remove =       esb2rom_remove_one,
 411 };
 412 #endif
 413
 414 static int __init init_esb2rom(void)
 415 {
 416         struct pci_dev *pdev;
 417         const struct pci_device_id *id;
 418         int retVal;
 419
 420         pdev = NULL;
 421         for (id = esb2rom_pci_tbl; id->vendor; id++) {
 422                 printk(KERN_DEBUG "device id = %x\n", id->device);
 423                 pdev = pci_get_device(id->vendor, id->device, NULL);
 424                 if (pdev) {
 425                         printk(KERN_DEBUG "matched device = %x\n", id->device);
 426                         break;
 427                 }
 428         }
 429         if (pdev) {
 430                 printk(KERN_DEBUG "matched device id %x\n", id->device);
 431                 retVal = esb2rom_init_one(pdev, &esb2rom_pci_tbl[0]);
 432                 pci_dev_put(pdev);
 433                 printk(KERN_DEBUG "retVal = %d\n", retVal);
 434                 return retVal;
 435         }
 436         return -ENXIO;
 437 #if 0
 438         return pci_register_driver(&esb2rom_driver);
 439 #endif
 440 }
 441
 442 static void __exit cleanup_esb2rom(void)
 443 {
 444         esb2rom_remove_one(esb2rom_window.pdev);
 445 }
 446
 447 module_init(init_esb2rom);
 448 module_exit(cleanup_esb2rom);
 449
 450 MODULE_LICENSE("GPL");
 451 MODULE_AUTHOR("Lew Glendenning <lglendenning@lnxi.com>");
 452 MODULE_DESCRIPTION("MTD map driver for BIOS chips on the ESB2 southbridge");