drivers/mtd/maps/amd76xrom.c

   1 /*
   2  * amd76xrom.c
   3  *
   4  * Normal mappings of chips in physical memory
   5  * $Id: amd76xrom.c,v 1.21 2005/11/07 11:14:26 gleixner Exp $
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/types.h>
  10 #include <linux/kernel.h>
  11 #include <linux/init.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/config.h>
  18 #include <linux/pci.h>
  19 #include <linux/pci_ids.h>
  20 #include <linux/list.h>
  21
  22
  23 #define xstr(s) str(s)
  24 #define str(s) #s
  25 #define MOD_NAME xstr(KBUILD_BASENAME)
  26
  27 #define ADDRESS_NAME_LEN 18
  28
  29 #define ROM_PROBE_STEP_SIZE (64*1024) /* 64KiB */
  30
  31 struct amd76xrom_window {
  32         void __iomem *virt;
  33         unsigned long phys;
  34         unsigned long size;
  35         struct list_head maps;
  36         struct resource rsrc;
  37         struct pci_dev *pdev;
  38 };
  39
  40 struct amd76xrom_map_info {
  41         struct list_head list;
  42         struct map_info map;
  43         struct mtd_info *mtd;
  44         struct resource rsrc;
  45         char map_name[sizeof(MOD_NAME) + 2 + ADDRESS_NAME_LEN];
  46 };
  47
  48 static struct amd76xrom_window amd76xrom_window = {
  49         .maps = LIST_HEAD_INIT(amd76xrom_window.maps),
  50 };
  51
  52 static void amd76xrom_cleanup(struct amd76xrom_window *window)
  53 {
  54         struct amd76xrom_map_info *map, *scratch;
  55         u8 byte;
  56
  57         if (window->pdev) {
  58                 /* Disable writes through the rom window */
  59                 pci_read_config_byte(window->pdev, 0x40, &byte);
  60                 pci_write_config_byte(window->pdev, 0x40, byte & ~1);
  61         }
  62
  63         /* Free all of the mtd devices */
  64         list_for_each_entry_safe(map, scratch, &window->maps, list) {
  65                 if (map->rsrc.parent) {
  66                         release_resource(&map->rsrc);
  67                 }
  68                 del_mtd_device(map->mtd);
  69                 map_destroy(map->mtd);
  70                 list_del(&map->list);
  71                 kfree(map);
  72         }
  73         if (window->rsrc.parent)
  74                 release_resource(&window->rsrc);
  75
  76         if (window->virt) {
  77                 iounmap(window->virt);
  78                 window->virt = NULL;
  79                 window->phys = 0;
  80                 window->size = 0;
  81                 window->pdev = NULL;
  82         }
  83 }
  84
  85
  86 static int __devinit amd76xrom_init_one (struct pci_dev *pdev,
  87         const struct pci_device_id *ent)
  88 {
  89         static char *rom_probe_types[] = { "cfi_probe", "jedec_probe", NULL };
  90         u8 byte;
  91         struct amd76xrom_window *window = &amd76xrom_window;
  92         struct amd76xrom_map_info *map = NULL;
  93         unsigned long map_top;
  94
  95         /* Remember the pci dev I find the window in */
  96         window->pdev = pdev;
  97
  98         /* Assume the rom window is properly setup, and find it's size */
  99         pci_read_config_byte(pdev, 0x43, &byte);
 100         if ((byte & ((1<<7)|(1<<6))) == ((1<<7)|(1<<6))) {
 101                 window->phys = 0xffb00000; /* 5MiB */
 102         }
 103         else if ((byte & (1<<7)) == (1<<7)) {
 104                 window->phys = 0xffc00000; /* 4MiB */
 105         }
 106         else {
 107                 window->phys = 0xffff0000; /* 64KiB */
 108         }
 109         window->size = 0xffffffffUL - window->phys + 1UL;
 110
 111         /*
 112          * Try to reserve the window mem region.  If this fails then
 113          * it is likely due to a fragment of the window being
 114          * "reseved" by the BIOS.  In the case that the
 115          * request_mem_region() fails then once the rom size is
 116          * discovered we will try to reserve the unreserved fragment.
 117          */
 118         window->rsrc.name = MOD_NAME;
 119         window->rsrc.start = window->phys;
 120         window->rsrc.end   = window->phys + window->size - 1;
 121         window->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 122         if (request_resource(&iomem_resource, &window->rsrc)) {
 123                 window->rsrc.parent = NULL;
 124                 printk(KERN_ERR MOD_NAME
 125                         " %s(): Unable to register resource"
 126                         " 0x%.08lx-0x%.08lx - kernel bug?\n",
 127                         __func__,
 128                         window->rsrc.start, window->rsrc.end);
 129         }
 130
 131 #if 0
 132
 133         /* Enable the selected rom window */
 134         pci_read_config_byte(pdev, 0x43, &byte);
 135         pci_write_config_byte(pdev, 0x43, byte | rwindow->segen_bits);
 136 #endif
 137
 138         /* Enable writes through the rom window */
 139         pci_read_config_byte(pdev, 0x40, &byte);
 140         pci_write_config_byte(pdev, 0x40, byte | 1);
 141
 142         /* FIXME handle registers 0x80 - 0x8C the bios region locks */
 143
 144         /* For write accesses caches are useless */
 145         window->virt = ioremap_nocache(window->phys, window->size);
 146         if (!window->virt) {
 147                 printk(KERN_ERR MOD_NAME ": ioremap(%08lx, %08lx) failed\n",
 148                         window->phys, window->size);
 149                 goto out;
 150         }
 151
 152         /* Get the first address to look for an rom chip at */
 153         map_top = window->phys;
 154 #if 1
 155         /* The probe sequence run over the firmware hub lock
 156          * registers sets them to 0x7 (no access).
 157          * Probe at most the last 4M of the address space.
 158          */
 159         if (map_top < 0xffc00000) {
 160                 map_top = 0xffc00000;
 161         }
 162 #endif
 163         /* Loop  through and look for rom chips */
 164         while((map_top - 1) < 0xffffffffUL) {
 165                 struct cfi_private *cfi;
 166                 unsigned long offset;
 167                 int i;
 168
 169                 if (!map) {
 170                         map = kmalloc(sizeof(*map), GFP_KERNEL);
 171                 }
 172                 if (!map) {
 173                         printk(KERN_ERR MOD_NAME ": kmalloc failed");
 174                         goto out;
 175                 }
 176                 memset(map, 0, sizeof(*map));
 177                 INIT_LIST_HEAD(&map->list);
 178                 map->map.name = map->map_name;
 179                 map->map.phys = map_top;
 180                 offset = map_top - window->phys;
 181                 map->map.virt = (void __iomem *)
 182                         (((unsigned long)(window->virt)) + offset);
 183                 map->map.size = 0xffffffffUL - map_top + 1UL;
 184                 /* Set the name of the map to the address I am trying */
 185                 sprintf(map->map_name, "%s @%08lx",
 186                         MOD_NAME, map->map.phys);
 187
 188                 /* There is no generic VPP support */
 189                 for(map->map.bankwidth = 32; map->map.bankwidth;
 190                         map->map.bankwidth >>= 1)
 191                 {
 192                         char **probe_type;
 193                         /* Skip bankwidths that are not supported */
 194                         if (!map_bankwidth_supported(map->map.bankwidth))
 195                                 continue;
 196
 197                         /* Setup the map methods */
 198                         simple_map_init(&map->map);
 199
 200                         /* Try all of the probe methods */
 201                         probe_type = rom_probe_types;
 202                         for(; *probe_type; probe_type++) {
 203                                 map->mtd = do_map_probe(*probe_type, &map->map);
 204                                 if (map->mtd)
 205                                         goto found;
 206                         }
 207                 }
 208                 map_top += ROM_PROBE_STEP_SIZE;
 209                 continue;
 210         found:
 211                 /* Trim the size if we are larger than the map */
 212                 if (map->mtd->size > map->map.size) {
 213                         printk(KERN_WARNING MOD_NAME
 214                                 " rom(%u) larger than window(%lu). fixing...\n",
 215                                 map->mtd->size, map->map.size);
 216                         map->mtd->size = map->map.size;
 217                 }
 218                 if (window->rsrc.parent) {
 219                         /*
 220                          * Registering the MTD device in iomem may not be possible
 221                          * if there is a BIOS "reserved" and BUSY range.  If this
 222                          * fails then continue anyway.
 223                          */
 224                         map->rsrc.name  = map->map_name;
 225                         map->rsrc.start = map->map.phys;
 226                         map->rsrc.end   = map->map.phys + map->mtd->size - 1;
 227                         map->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 228                         if (request_resource(&window->rsrc, &map->rsrc)) {
 229                                 printk(KERN_ERR MOD_NAME
 230                                         ": cannot reserve MTD resource\n");
 231                                 map->rsrc.parent = NULL;
 232                         }
 233                 }
 234
 235                 /* Make the whole region visible in the map */
 236                 map->map.virt = window->virt;
 237                 map->map.phys = window->phys;
 238                 cfi = map->map.fldrv_priv;
 239                 for(i = 0; i < cfi->numchips; i++) {
 240                         cfi->chips[i].start += offset;
 241                 }
 242
 243                 /* Now that the mtd devices is complete claim and export it */
 244                 map->mtd->owner = THIS_MODULE;
 245                 if (add_mtd_device(map->mtd)) {
 246                         map_destroy(map->mtd);
 247                         map->mtd = NULL;
 248                         goto out;
 249                 }
 250
 251
 252                 /* Calculate the new value of map_top */
 253                 map_top += map->mtd->size;
 254
 255                 /* File away the map structure */
 256                 list_add(&map->list, &window->maps);
 257                 map = NULL;
 258         }
 259
 260  out:
 261         /* Free any left over map structures */
 262         kfree(map);
 263         /* See if I have any map structures */
 264         if (list_empty(&window->maps)) {
 265                 amd76xrom_cleanup(window);
 266                 return -ENODEV;
 267         }
 268         return 0;
 269 }
 270
 271
 272 static void __devexit amd76xrom_remove_one (struct pci_dev *pdev)
 273 {
 274         struct amd76xrom_window *window = &amd76xrom_window;
 275
 276         amd76xrom_cleanup(window);
 277 }
 278
 279 static struct pci_device_id amd76xrom_pci_tbl[] = {
 280         { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7410,
 281                 PCI_ANY_ID, PCI_ANY_ID, },
 282         { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7440,
 283                 PCI_ANY_ID, PCI_ANY_ID, },
 284         { PCI_VENDOR_ID_AMD, 0x7468 }, /* amd8111 support */
 285         { 0, }
 286 };
 287
 288 MODULE_DEVICE_TABLE(pci, amd76xrom_pci_tbl);
 289
 290 #if 0
 291 static struct pci_driver amd76xrom_driver = {
 292         .name =         MOD_NAME,
 293         .id_table =     amd76xrom_pci_tbl,
 294         .probe =        amd76xrom_init_one,
 295         .remove =       amd76xrom_remove_one,
 296 };
 297 #endif
 298
 299 static int __init init_amd76xrom(void)
 300 {
 301         struct pci_dev *pdev;
 302         struct pci_device_id *id;
 303         pdev = NULL;
 304         for(id = amd76xrom_pci_tbl; id->vendor; id++) {
 305                 pdev = pci_find_device(id->vendor, id->device, NULL);
 306                 if (pdev) {
 307                         break;
 308                 }
 309         }
 310         if (pdev) {
 311                 return amd76xrom_init_one(pdev, &amd76xrom_pci_tbl[0]);
 312         }
 313         return -ENXIO;
 314 #if 0
 315         return pci_register_driver(&amd76xrom_driver);
 316 #endif
 317 }
 318
 319 static void __exit cleanup_amd76xrom(void)
 320 {
 321         amd76xrom_remove_one(amd76xrom_window.pdev);
 322 }
 323
 324 module_init(init_amd76xrom);
 325 module_exit(cleanup_amd76xrom);
 326
 327 MODULE_LICENSE("GPL");
 328 MODULE_AUTHOR("Eric Biederman <ebiederman@lnxi.com>");
 329 MODULE_DESCRIPTION("MTD map driver for BIOS chips on the AMD76X southbridge");
 330