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