drivers/mtd/maps/ck804xrom.c

   1 /*
   2  * ck804xrom.c
   3  *
   4  * Normal mappings of chips in physical memory
   5  *
   6  * Dave Olsen <dolsen@lnxi.com>
   7  * Ryan Jackson <rjackson@lnxi.com>
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/types.h>
  12 #include <linux/kernel.h>
  13 #include <linux/init.h>
  14 #include <linux/slab.h>
  15 #include <asm/io.h>
  16 #include <linux/mtd/mtd.h>
  17 #include <linux/mtd/map.h>
  18 #include <linux/mtd/cfi.h>
  19 #include <linux/mtd/flashchip.h>
  20 #include <linux/pci.h>
  21 #include <linux/pci_ids.h>
  22 #include <linux/list.h>
  23
  24
  25 #define MOD_NAME KBUILD_BASENAME
  26
  27 #define ADDRESS_NAME_LEN 18
  28
  29 #define ROM_PROBE_STEP_SIZE (64*1024)
  30
  31 #define DEV_CK804 1
  32 #define DEV_MCP55 2
  33
  34 struct ck804xrom_window {
  35         void __iomem *virt;
  36         unsigned long phys;
  37         unsigned long size;
  38         struct list_head maps;
  39         struct resource rsrc;
  40         struct pci_dev *pdev;
  41 };
  42
  43 struct ck804xrom_map_info {
  44         struct list_head list;
  45         struct map_info map;
  46         struct mtd_info *mtd;
  47         struct resource rsrc;
  48         char map_name[sizeof(MOD_NAME) + 2 + ADDRESS_NAME_LEN];
  49 };
  50
  51 /*
  52  * The following applies to ck804 only:
  53  * The 2 bits controlling the window size are often set to allow reading
  54  * the BIOS, but too small to allow writing, since the lock registers are
  55  * 4MiB lower in the address space than the data.
  56  *
  57  * This is intended to prevent flashing the bios, perhaps accidentally.
  58  *
  59  * This parameter allows the normal driver to override the BIOS settings.
  60  *
  61  * The bits are 6 and 7.  If both bits are set, it is a 5MiB window.
  62  * If only the 7 Bit is set, it is a 4MiB window.  Otherwise, a
  63  * 64KiB window.
  64  *
  65  * The following applies to mcp55 only:
  66  * The 15 bits controlling the window size are distributed as follows:
  67  * byte @0x88: bit 0..7
  68  * byte @0x8c: bit 8..15
  69  * word @0x90: bit 16..30
  70  * If all bits are enabled, we have a 16? MiB window
  71  * Please set win_size_bits to 0x7fffffff if you actually want to do something
  72  */
  73 static uint win_size_bits = 0;
  74 module_param(win_size_bits, uint, 0);
  75 MODULE_PARM_DESC(win_size_bits, "ROM window size bits override, normally set by BIOS.");
  76
  77 static struct ck804xrom_window ck804xrom_window = {
  78         .maps = LIST_HEAD_INIT(ck804xrom_window.maps),
  79 };
  80
  81 static void ck804xrom_cleanup(struct ck804xrom_window *window)
  82 {
  83         struct ck804xrom_map_info *map, *scratch;
  84         u8 byte;
  85
  86         if (window->pdev) {
  87                 /* Disable writes through the rom window */
  88                 pci_read_config_byte(window->pdev, 0x6d, &byte);
  89                 pci_write_config_byte(window->pdev, 0x6d, byte & ~1);
  90         }
  91
  92         /* Free all of the mtd devices */
  93         list_for_each_entry_safe(map, scratch, &window->maps, list) {
  94                 if (map->rsrc.parent)
  95                         release_resource(&map->rsrc);
  96
  97                 mtd_device_unregister(map->mtd);
  98                 map_destroy(map->mtd);
  99                 list_del(&map->list);
 100                 kfree(map);
 101         }
 102         if (window->rsrc.parent)
 103                 release_resource(&window->rsrc);
 104
 105         if (window->virt) {
 106                 iounmap(window->virt);
 107                 window->virt = NULL;
 108                 window->phys = 0;
 109                 window->size = 0;
 110         }
 111         pci_dev_put(window->pdev);
 112 }
 113
 114
 115 static int ck804xrom_init_one(struct pci_dev *pdev,
 116                               const struct pci_device_id *ent)
 117 {
 118         static char *rom_probe_types[] = { "cfi_probe", "jedec_probe", NULL };
 119         u8 byte;
 120         u16 word;
 121         struct ck804xrom_window *window = &ck804xrom_window;
 122         struct ck804xrom_map_info *map = NULL;
 123         unsigned long map_top;
 124
 125         /* Remember the pci dev I find the window in */
 126         window->pdev = pci_dev_get(pdev);
 127
 128         switch (ent->driver_data) {
 129         case DEV_CK804:
 130                 /* Enable the selected rom window.  This is often incorrectly
 131                  * set up by the BIOS, and the 4MiB offset for the lock registers
 132                  * requires the full 5MiB of window space.
 133                  *
 134                  * This 'write, then read' approach leaves the bits for
 135                  * other uses of the hardware info.
 136                  */
 137                 pci_read_config_byte(pdev, 0x88, &byte);
 138                 pci_write_config_byte(pdev, 0x88, byte | win_size_bits );
 139
 140                 /* Assume the rom window is properly setup, and find it's size */
 141                 pci_read_config_byte(pdev, 0x88, &byte);
 142
 143                 if ((byte & ((1<<7)|(1<<6))) == ((1<<7)|(1<<6)))
 144                         window->phys = 0xffb00000; /* 5MiB */
 145                 else if ((byte & (1<<7)) == (1<<7))
 146                         window->phys = 0xffc00000; /* 4MiB */
 147                 else
 148                         window->phys = 0xffff0000; /* 64KiB */
 149                 break;
 150
 151         case DEV_MCP55:
 152                 pci_read_config_byte(pdev, 0x88, &byte);
 153                 pci_write_config_byte(pdev, 0x88, byte | (win_size_bits & 0xff));
 154
 155                 pci_read_config_byte(pdev, 0x8c, &byte);
 156                 pci_write_config_byte(pdev, 0x8c, byte | ((win_size_bits & 0xff00) >> 8));
 157
 158                 pci_read_config_word(pdev, 0x90, &word);
 159                 pci_write_config_word(pdev, 0x90, word | ((win_size_bits & 0x7fff0000) >> 16));
 160
 161                 window->phys = 0xff000000; /* 16MiB, hardcoded for now */
 162                 break;
 163         }
 164
 165         window->size = 0xffffffffUL - window->phys + 1UL;
 166
 167         /*
 168          * Try to reserve the window mem region.  If this fails then
 169          * it is likely due to a fragment of the window being
 170          * "reserved" by the BIOS.  In the case that the
 171          * request_mem_region() fails then once the rom size is
 172          * discovered we will try to reserve the unreserved fragment.
 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_ERR MOD_NAME
 181                        " %s(): Unable to register resource %pR - kernel bug?\n",
 182                         __func__, &window->rsrc);
 183         }
 184
 185
 186         /* Enable writes through the rom window */
 187         pci_read_config_byte(pdev, 0x6d, &byte);
 188         pci_write_config_byte(pdev, 0x6d, byte | 1);
 189
 190         /* FIXME handle registers 0x80 - 0x8C the bios region locks */
 191
 192         /* For write accesses caches are useless */
 193         window->virt = ioremap_nocache(window->phys, window->size);
 194         if (!window->virt) {
 195                 printk(KERN_ERR MOD_NAME ": ioremap(%08lx, %08lx) failed\n",
 196                         window->phys, window->size);
 197                 goto out;
 198         }
 199
 200         /* Get the first address to look for a rom chip at */
 201         map_top = window->phys;
 202 #if 1
 203         /* The probe sequence run over the firmware hub lock
 204          * registers sets them to 0x7 (no access).
 205          * Probe at most the last 4MiB of the address space.
 206          */
 207         if (map_top < 0xffc00000)
 208                 map_top = 0xffc00000;
 209 #endif
 210         /* Loop  through and look for rom chips.  Since we don't know the
 211          * starting address for each chip, probe every ROM_PROBE_STEP_SIZE
 212          * bytes from the starting address of the window.
 213          */
 214         while((map_top - 1) < 0xffffffffUL) {
 215                 struct cfi_private *cfi;
 216                 unsigned long offset;
 217                 int i;
 218
 219                 if (!map)
 220                         map = kmalloc(sizeof(*map), GFP_KERNEL);
 221
 222                 if (!map) {
 223                         printk(KERN_ERR MOD_NAME ": kmalloc failed");
 224                         goto out;
 225                 }
 226                 memset(map, 0, sizeof(*map));
 227                 INIT_LIST_HEAD(&map->list);
 228                 map->map.name = map->map_name;
 229                 map->map.phys = map_top;
 230                 offset = map_top - window->phys;
 231                 map->map.virt = (void __iomem *)
 232                         (((unsigned long)(window->virt)) + offset);
 233                 map->map.size = 0xffffffffUL - map_top + 1UL;
 234                 /* Set the name of the map to the address I am trying */
 235                 sprintf(map->map_name, "%s @%08Lx",
 236                         MOD_NAME, (unsigned long long)map->map.phys);
 237
 238                 /* There is no generic VPP support */
 239                 for(map->map.bankwidth = 32; map->map.bankwidth;
 240                         map->map.bankwidth >>= 1)
 241                 {
 242                         char **probe_type;
 243                         /* Skip bankwidths that are not supported */
 244                         if (!map_bankwidth_supported(map->map.bankwidth))
 245                                 continue;
 246
 247                         /* Setup the map methods */
 248                         simple_map_init(&map->map);
 249
 250                         /* Try all of the probe methods */
 251                         probe_type = rom_probe_types;
 252                         for(; *probe_type; probe_type++) {
 253                                 map->mtd = do_map_probe(*probe_type, &map->map);
 254                                 if (map->mtd)
 255                                         goto found;
 256                         }
 257                 }
 258                 map_top += ROM_PROBE_STEP_SIZE;
 259                 continue;
 260         found:
 261                 /* Trim the size if we are larger than the map */
 262                 if (map->mtd->size > map->map.size) {
 263                         printk(KERN_WARNING MOD_NAME
 264                                 " rom(%llu) larger than window(%lu). fixing...\n",
 265                                 (unsigned long long)map->mtd->size, map->map.size);
 266                         map->mtd->size = map->map.size;
 267                 }
 268                 if (window->rsrc.parent) {
 269                         /*
 270                          * Registering the MTD device in iomem may not be possible
 271                          * if there is a BIOS "reserved" and BUSY range.  If this
 272                          * fails then continue anyway.
 273                          */
 274                         map->rsrc.name  = map->map_name;
 275                         map->rsrc.start = map->map.phys;
 276                         map->rsrc.end   = map->map.phys + map->mtd->size - 1;
 277                         map->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 278                         if (request_resource(&window->rsrc, &map->rsrc)) {
 279                                 printk(KERN_ERR MOD_NAME
 280                                         ": cannot reserve MTD resource\n");
 281                                 map->rsrc.parent = NULL;
 282                         }
 283                 }
 284
 285                 /* Make the whole region visible in the map */
 286                 map->map.virt = window->virt;
 287                 map->map.phys = window->phys;
 288                 cfi = map->map.fldrv_priv;
 289                 for(i = 0; i < cfi->numchips; i++)
 290                         cfi->chips[i].start += offset;
 291
 292                 /* Now that the mtd devices is complete claim and export it */
 293                 map->mtd->owner = THIS_MODULE;
 294                 if (mtd_device_register(map->mtd, NULL, 0)) {
 295                         map_destroy(map->mtd);
 296                         map->mtd = NULL;
 297                         goto out;
 298                 }
 299
 300
 301                 /* Calculate the new value of map_top */
 302                 map_top += map->mtd->size;
 303
 304                 /* File away the map structure */
 305                 list_add(&map->list, &window->maps);
 306                 map = NULL;
 307         }
 308
 309  out:
 310         /* Free any left over map structures */
 311         kfree(map);
 312
 313         /* See if I have any map structures */
 314         if (list_empty(&window->maps)) {
 315                 ck804xrom_cleanup(window);
 316                 return -ENODEV;
 317         }
 318         return 0;
 319 }
 320
 321
 322 static void ck804xrom_remove_one(struct pci_dev *pdev)
 323 {
 324         struct ck804xrom_window *window = &ck804xrom_window;
 325
 326         ck804xrom_cleanup(window);
 327 }
 328
 329 static struct pci_device_id ck804xrom_pci_tbl[] = {
 330         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, 0x0051), .driver_data = DEV_CK804 },
 331         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, 0x0360), .driver_data = DEV_MCP55 },
 332         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, 0x0361), .driver_data = DEV_MCP55 },
 333         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, 0x0362), .driver_data = DEV_MCP55 },
 334         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, 0x0363), .driver_data = DEV_MCP55 },
 335         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, 0x0364), .driver_data = DEV_MCP55 },
 336         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, 0x0365), .driver_data = DEV_MCP55 },
 337         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, 0x0366), .driver_data = DEV_MCP55 },
 338         { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, 0x0367), .driver_data = DEV_MCP55 },
 339         { 0, }
 340 };
 341
 342 #if 0
 343 MODULE_DEVICE_TABLE(pci, ck804xrom_pci_tbl);
 344
 345 static struct pci_driver ck804xrom_driver = {
 346         .name =         MOD_NAME,
 347         .id_table =     ck804xrom_pci_tbl,
 348         .probe =        ck804xrom_init_one,
 349         .remove =       ck804xrom_remove_one,
 350 };
 351 #endif
 352
 353 static int __init init_ck804xrom(void)
 354 {
 355         struct pci_dev *pdev;
 356         struct pci_device_id *id;
 357         int retVal;
 358         pdev = NULL;
 359
 360         for(id = ck804xrom_pci_tbl; id->vendor; id++) {
 361                 pdev = pci_get_device(id->vendor, id->device, NULL);
 362                 if (pdev)
 363                         break;
 364         }
 365         if (pdev) {
 366                 retVal = ck804xrom_init_one(pdev, id);
 367                 pci_dev_put(pdev);
 368                 return retVal;
 369         }
 370         return -ENXIO;
 371 #if 0
 372         return pci_register_driver(&ck804xrom_driver);
 373 #endif
 374 }
 375
 376 static void __exit cleanup_ck804xrom(void)
 377 {
 378         ck804xrom_remove_one(ck804xrom_window.pdev);
 379 }
 380
 381 module_init(init_ck804xrom);
 382 module_exit(cleanup_ck804xrom);
 383
 384 MODULE_LICENSE("GPL");
 385 MODULE_AUTHOR("Eric Biederman <ebiederman@lnxi.com>, Dave Olsen <dolsen@lnxi.com>");
 386 MODULE_DESCRIPTION("MTD map driver for BIOS chips on the Nvidia ck804 southbridge");
 387