drivers/mtd/maps/ichxrom.c

   1 /*
   2  * ichxrom.c
   3  *
   4  * Normal mappings of chips in physical memory
   5  */
   6
   7 #include <linux/module.h>
   8 #include <linux/types.h>
   9 #include <linux/kernel.h>
  10 #include <linux/init.h>
  11 #include <linux/slab.h>
  12 #include <asm/io.h>
  13 #include <linux/mtd/mtd.h>
  14 #include <linux/mtd/map.h>
  15 #include <linux/mtd/cfi.h>
  16 #include <linux/mtd/flashchip.h>
  17 #include <linux/pci.h>
  18 #include <linux/pci_ids.h>
  19 #include <linux/list.h>
  20
  21 #define xstr(s) str(s)
  22 #define str(s) #s
  23 #define MOD_NAME xstr(KBUILD_BASENAME)
  24
  25 #define ADDRESS_NAME_LEN 18
  26
  27 #define ROM_PROBE_STEP_SIZE (64*1024) /* 64KiB */
  28
  29 #define BIOS_CNTL       0x4e
  30 #define FWH_DEC_EN1     0xE3
  31 #define FWH_DEC_EN2     0xF0
  32 #define FWH_SEL1        0xE8
  33 #define FWH_SEL2        0xEE
  34
  35 struct ichxrom_window {
  36         void __iomem* virt;
  37         unsigned long phys;
  38         unsigned long size;
  39         struct list_head maps;
  40         struct resource rsrc;
  41         struct pci_dev *pdev;
  42 };
  43
  44 struct ichxrom_map_info {
  45         struct list_head list;
  46         struct map_info map;
  47         struct mtd_info *mtd;
  48         struct resource rsrc;
  49         char map_name[sizeof(MOD_NAME) + 2 + ADDRESS_NAME_LEN];
  50 };
  51
  52 static struct ichxrom_window ichxrom_window = {
  53         .maps = LIST_HEAD_INIT(ichxrom_window.maps),
  54 };
  55
  56 static void ichxrom_cleanup(struct ichxrom_window *window)
  57 {
  58         struct ichxrom_map_info *map, *scratch;
  59         u16 word;
  60         int ret;
  61
  62         /* Disable writes through the rom window */
  63         ret = pci_read_config_word(window->pdev, BIOS_CNTL, &word);
  64         if (!ret)
  65                 pci_write_config_word(window->pdev, BIOS_CNTL, word & ~1);
  66         pci_dev_put(window->pdev);
  67
  68         /* Free all of the mtd devices */
  69         list_for_each_entry_safe(map, scratch, &window->maps, list) {
  70                 if (map->rsrc.parent)
  71                         release_resource(&map->rsrc);
  72                 mtd_device_unregister(map->mtd);
  73                 map_destroy(map->mtd);
  74                 list_del(&map->list);
  75                 kfree(map);
  76         }
  77         if (window->rsrc.parent)
  78                 release_resource(&window->rsrc);
  79         if (window->virt) {
  80                 iounmap(window->virt);
  81                 window->virt = NULL;
  82                 window->phys = 0;
  83                 window->size = 0;
  84                 window->pdev = NULL;
  85         }
  86 }
  87
  88
  89 static int __init ichxrom_init_one(struct pci_dev *pdev,
  90                                    const struct pci_device_id *ent)
  91 {
  92         static char *rom_probe_types[] = { "cfi_probe", "jedec_probe", NULL };
  93         struct ichxrom_window *window = &ichxrom_window;
  94         struct ichxrom_map_info *map = NULL;
  95         unsigned long map_top;
  96         u8 byte;
  97         u16 word;
  98
  99         /* For now I just handle the ichx and I assume there
 100          * are not a lot of resources up at the top of the address
 101          * space.  It is possible to handle other devices in the
 102          * top 16MB but it is very painful.  Also since
 103          * you can only really attach a FWH to an ICHX there
 104          * a number of simplifications you can make.
 105          *
 106          * Also you can page firmware hubs if an 8MB window isn't enough
 107          * but don't currently handle that case either.
 108          */
 109         window->pdev = pdev;
 110
 111         /* Find a region continuous to the end of the ROM window  */
 112         window->phys = 0;
 113         pci_read_config_byte(pdev, FWH_DEC_EN1, &byte);
 114         if (byte == 0xff) {
 115                 window->phys = 0xffc00000;
 116                 pci_read_config_byte(pdev, FWH_DEC_EN2, &byte);
 117                 if ((byte & 0x0f) == 0x0f) {
 118                         window->phys = 0xff400000;
 119                 }
 120                 else if ((byte & 0x0e) == 0x0e) {
 121                         window->phys = 0xff500000;
 122                 }
 123                 else if ((byte & 0x0c) == 0x0c) {
 124                         window->phys = 0xff600000;
 125                 }
 126                 else if ((byte & 0x08) == 0x08) {
 127                         window->phys = 0xff700000;
 128                 }
 129         }
 130         else if ((byte & 0xfe) == 0xfe) {
 131                 window->phys = 0xffc80000;
 132         }
 133         else if ((byte & 0xfc) == 0xfc) {
 134                 window->phys = 0xffd00000;
 135         }
 136         else if ((byte & 0xf8) == 0xf8) {
 137                 window->phys = 0xffd80000;
 138         }
 139         else if ((byte & 0xf0) == 0xf0) {
 140                 window->phys = 0xffe00000;
 141         }
 142         else if ((byte & 0xe0) == 0xe0) {
 143                 window->phys = 0xffe80000;
 144         }
 145         else if ((byte & 0xc0) == 0xc0) {
 146                 window->phys = 0xfff00000;
 147         }
 148         else if ((byte & 0x80) == 0x80) {
 149                 window->phys = 0xfff80000;
 150         }
 151
 152         if (window->phys == 0) {
 153                 printk(KERN_ERR MOD_NAME ": Rom window is closed\n");
 154                 goto out;
 155         }
 156         window->phys -= 0x400000UL;
 157         window->size = (0xffffffffUL - window->phys) + 1UL;
 158
 159         /* Enable writes through the rom window */
 160         pci_read_config_word(pdev, BIOS_CNTL, &word);
 161         if (!(word & 1)  && (word & (1<<1))) {
 162                 /* The BIOS will generate an error if I enable
 163                  * this device, so don't even try.
 164                  */
 165                 printk(KERN_ERR MOD_NAME ": firmware access control, I can't enable writes\n");
 166                 goto out;
 167         }
 168         pci_write_config_word(pdev, BIOS_CNTL, word | 1);
 169
 170         /*
 171          * Try to reserve the window mem region.  If this fails then
 172          * it is likely due to the window being "reserved" by the BIOS.
 173          */
 174         window->rsrc.name = MOD_NAME;
 175         window->rsrc.start = window->phys;
 176         window->rsrc.end   = window->phys + window->size - 1;
 177         window->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 178         if (request_resource(&iomem_resource, &window->rsrc)) {
 179                 window->rsrc.parent = NULL;
 180                 printk(KERN_DEBUG MOD_NAME ": "
 181                        "%s(): Unable to register resource %pR - kernel bug?\n",
 182                        __func__, &window->rsrc);
 183         }
 184
 185         /* Map the firmware hub into my address space. */
 186         window->virt = ioremap_nocache(window->phys, window->size);
 187         if (!window->virt) {
 188                 printk(KERN_ERR MOD_NAME ": ioremap(%08lx, %08lx) failed\n",
 189                         window->phys, window->size);
 190                 goto out;
 191         }
 192
 193         /* Get the first address to look for an rom chip at */
 194         map_top = window->phys;
 195         if ((window->phys & 0x3fffff) != 0) {
 196                 map_top = window->phys + 0x400000;
 197         }
 198 #if 1
 199         /* The probe sequence run over the firmware hub lock
 200          * registers sets them to 0x7 (no access).
 201          * Probe at most the last 4M of the address space.
 202          */
 203         if (map_top < 0xffc00000) {
 204                 map_top = 0xffc00000;
 205         }
 206 #endif
 207         /* Loop through and look for rom chips */
 208         while((map_top - 1) < 0xffffffffUL) {
 209                 struct cfi_private *cfi;
 210                 unsigned long offset;
 211                 int i;
 212
 213                 if (!map) {
 214                         map = kmalloc(sizeof(*map), GFP_KERNEL);
 215                 }
 216                 if (!map) {
 217                         printk(KERN_ERR MOD_NAME ": kmalloc failed");
 218                         goto out;
 219                 }
 220                 memset(map, 0, sizeof(*map));
 221                 INIT_LIST_HEAD(&map->list);
 222                 map->map.name = map->map_name;
 223                 map->map.phys = map_top;
 224                 offset = map_top - window->phys;
 225                 map->map.virt = (void __iomem *)
 226                         (((unsigned long)(window->virt)) + offset);
 227                 map->map.size = 0xffffffffUL - map_top + 1UL;
 228                 /* Set the name of the map to the address I am trying */
 229                 sprintf(map->map_name, "%s @%08Lx",
 230                         MOD_NAME, (unsigned long long)map->map.phys);
 231
 232                 /* Firmware hubs only use vpp when being programmed
 233                  * in a factory setting.  So in-place programming
 234                  * needs to use a different method.
 235                  */
 236                 for(map->map.bankwidth = 32; map->map.bankwidth;
 237                         map->map.bankwidth >>= 1)
 238                 {
 239                         char **probe_type;
 240                         /* Skip bankwidths that are not supported */
 241                         if (!map_bankwidth_supported(map->map.bankwidth))
 242                                 continue;
 243
 244                         /* Setup the map methods */
 245                         simple_map_init(&map->map);
 246
 247                         /* Try all of the probe methods */
 248                         probe_type = rom_probe_types;
 249                         for(; *probe_type; probe_type++) {
 250                                 map->mtd = do_map_probe(*probe_type, &map->map);
 251                                 if (map->mtd)
 252                                         goto found;
 253                         }
 254                 }
 255                 map_top += ROM_PROBE_STEP_SIZE;
 256                 continue;
 257         found:
 258                 /* Trim the size if we are larger than the map */
 259                 if (map->mtd->size > map->map.size) {
 260                         printk(KERN_WARNING MOD_NAME
 261                                 " rom(%llu) larger than window(%lu). fixing...\n",
 262                                 (unsigned long long)map->mtd->size, map->map.size);
 263                         map->mtd->size = map->map.size;
 264                 }
 265                 if (window->rsrc.parent) {
 266                         /*
 267                          * Registering the MTD device in iomem may not be possible
 268                          * if there is a BIOS "reserved" and BUSY range.  If this
 269                          * fails then continue anyway.
 270                          */
 271                         map->rsrc.name  = map->map_name;
 272                         map->rsrc.start = map->map.phys;
 273                         map->rsrc.end   = map->map.phys + map->mtd->size - 1;
 274                         map->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 275                         if (request_resource(&window->rsrc, &map->rsrc)) {
 276                                 printk(KERN_ERR MOD_NAME
 277                                         ": cannot reserve MTD resource\n");
 278                                 map->rsrc.parent = NULL;
 279                         }
 280                 }
 281
 282                 /* Make the whole region visible in the map */
 283                 map->map.virt = window->virt;
 284                 map->map.phys = window->phys;
 285                 cfi = map->map.fldrv_priv;
 286                 for(i = 0; i < cfi->numchips; i++) {
 287                         cfi->chips[i].start += offset;
 288                 }
 289
 290                 /* Now that the mtd devices is complete claim and export it */
 291                 map->mtd->owner = THIS_MODULE;
 292                 if (mtd_device_register(map->mtd, NULL, 0)) {
 293                         map_destroy(map->mtd);
 294                         map->mtd = NULL;
 295                         goto out;
 296                 }
 297
 298
 299                 /* Calculate the new value of map_top */
 300                 map_top += map->mtd->size;
 301
 302                 /* File away the map structure */
 303                 list_add(&map->list, &window->maps);
 304                 map = NULL;
 305         }
 306
 307  out:
 308         /* Free any left over map structures */
 309         kfree(map);
 310
 311         /* See if I have any map structures */
 312         if (list_empty(&window->maps)) {
 313                 ichxrom_cleanup(window);
 314                 return -ENODEV;
 315         }
 316         return 0;
 317 }
 318
 319
 320 static void ichxrom_remove_one(struct pci_dev *pdev)
 321 {
 322         struct ichxrom_window *window = &ichxrom_window;
 323         ichxrom_cleanup(window);
 324 }
 325
 326 static const struct pci_device_id ichxrom_pci_tbl[] = {
 327         { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0,
 328           PCI_ANY_ID, PCI_ANY_ID, },
 329         { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_0,
 330           PCI_ANY_ID, PCI_ANY_ID, },
 331         { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0,
 332           PCI_ANY_ID, PCI_ANY_ID, },
 333         { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0,
 334           PCI_ANY_ID, PCI_ANY_ID, },
 335         { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_1,
 336           PCI_ANY_ID, PCI_ANY_ID, },
 337         { 0, },
 338 };
 339
 340 #if 0
 341 MODULE_DEVICE_TABLE(pci, ichxrom_pci_tbl);
 342
 343 static struct pci_driver ichxrom_driver = {
 344         .name =         MOD_NAME,
 345         .id_table =     ichxrom_pci_tbl,
 346         .probe =        ichxrom_init_one,
 347         .remove =       ichxrom_remove_one,
 348 };
 349 #endif
 350
 351 static int __init init_ichxrom(void)
 352 {
 353         struct pci_dev *pdev;
 354         const struct pci_device_id *id;
 355
 356         pdev = NULL;
 357         for (id = ichxrom_pci_tbl; id->vendor; id++) {
 358                 pdev = pci_get_device(id->vendor, id->device, NULL);
 359                 if (pdev) {
 360                         break;
 361                 }
 362         }
 363         if (pdev) {
 364                 return ichxrom_init_one(pdev, &ichxrom_pci_tbl[0]);
 365         }
 366         return -ENXIO;
 367 #if 0
 368         return pci_register_driver(&ichxrom_driver);
 369 #endif
 370 }
 371
 372 static void __exit cleanup_ichxrom(void)
 373 {
 374         ichxrom_remove_one(ichxrom_window.pdev);
 375 }
 376
 377 module_init(init_ichxrom);
 378 module_exit(cleanup_ichxrom);
 379
 380 MODULE_LICENSE("GPL");
 381 MODULE_AUTHOR("Eric Biederman <ebiederman@lnxi.com>");
 382 MODULE_DESCRIPTION("MTD map driver for BIOS chips on the ICHX southbridge");