drivers/mtd/chips/cfi_probe.c

   1 /*
   2    Common Flash Interface probe code.
   3    (C) 2000 Red Hat. GPL'd.
   4 */
   5
   6 #include <linux/module.h>
   7 #include <linux/types.h>
   8 #include <linux/kernel.h>
   9 #include <linux/init.h>
  10 #include <asm/io.h>
  11 #include <asm/byteorder.h>
  12 #include <linux/errno.h>
  13 #include <linux/slab.h>
  14 #include <linux/interrupt.h>
  15
  16 #include <linux/mtd/xip.h>
  17 #include <linux/mtd/map.h>
  18 #include <linux/mtd/cfi.h>
  19 #include <linux/mtd/gen_probe.h>
  20
  21 //#define DEBUG_CFI
  22
  23 #ifdef DEBUG_CFI
  24 static void print_cfi_ident(struct cfi_ident *);
  25 #endif
  26
  27 static int cfi_probe_chip(struct map_info *map, __u32 base,
  28                           unsigned long *chip_map, struct cfi_private *cfi);
  29 static int cfi_chip_setup(struct map_info *map, struct cfi_private *cfi);
  30
  31 struct mtd_info *cfi_probe(struct map_info *map);
  32
  33 #ifdef CONFIG_MTD_XIP
  34
  35 /* only needed for short periods, so this is rather simple */
  36 #define xip_disable()   local_irq_disable()
  37
  38 #define xip_allowed(base, map) \
  39 do { \
  40         (void) map_read(map, base); \
  41         xip_iprefetch(); \
  42         local_irq_enable(); \
  43 } while (0)
  44
  45 #define xip_enable(base, map, cfi) \
  46 do { \
  47         cfi_qry_mode_off(base, map, cfi);               \
  48         xip_allowed(base, map); \
  49 } while (0)
  50
  51 #define xip_disable_qry(base, map, cfi) \
  52 do { \
  53         xip_disable(); \
  54         cfi_qry_mode_on(base, map, cfi); \
  55 } while (0)
  56
  57 #else
  58
  59 #define xip_disable()                   do { } while (0)
  60 #define xip_allowed(base, map)          do { } while (0)
  61 #define xip_enable(base, map, cfi)      do { } while (0)
  62 #define xip_disable_qry(base, map, cfi) do { } while (0)
  63
  64 #endif
  65
  66 /* check for QRY.
  67    in: interleave,type,mode
  68    ret: table index, <0 for error
  69  */
  70
  71 static int __xipram cfi_probe_chip(struct map_info *map, __u32 base,
  72                                    unsigned long *chip_map, struct cfi_private *cfi)
  73 {
  74         int i;
  75
  76         if ((base + 0) >= map->size) {
  77                 printk(KERN_NOTICE
  78                         "Probe at base[0x00](0x%08lx) past the end of the map(0x%08lx)\n",
  79                         (unsigned long)base, map->size -1);
  80                 return 0;
  81         }
  82         if ((base + 0xff) >= map->size) {
  83                 printk(KERN_NOTICE
  84                         "Probe at base[0x55](0x%08lx) past the end of the map(0x%08lx)\n",
  85                         (unsigned long)base + 0x55, map->size -1);
  86                 return 0;
  87         }
  88
  89         xip_disable();
  90         if (!cfi_qry_mode_on(base, map, cfi)) {
  91                 xip_enable(base, map, cfi);
  92                 return 0;
  93         }
  94
  95         if (!cfi->numchips) {
  96                 /* This is the first time we're called. Set up the CFI
  97                    stuff accordingly and return */
  98                 return cfi_chip_setup(map, cfi);
  99         }
 100
 101         /* Check each previous chip to see if it's an alias */
 102         for (i=0; i < (base >> cfi->chipshift); i++) {
 103                 unsigned long start;
 104                 if(!test_bit(i, chip_map)) {
 105                         /* Skip location; no valid chip at this address */
 106                         continue;
 107                 }
 108                 start = i << cfi->chipshift;
 109                 /* This chip should be in read mode if it's one
 110                    we've already touched. */
 111                 if (cfi_qry_present(map, start, cfi)) {
 112                         /* Eep. This chip also had the QRY marker.
 113                          * Is it an alias for the new one? */
 114                         cfi_qry_mode_off(start, map, cfi);
 115
 116                         /* If the QRY marker goes away, it's an alias */
 117                         if (!cfi_qry_present(map, start, cfi)) {
 118                                 xip_allowed(base, map);
 119                                 printk(KERN_DEBUG "%s: Found an alias at 0x%x for the chip at 0x%lx\n",
 120                                        map->name, base, start);
 121                                 return 0;
 122                         }
 123                         /* Yes, it's actually got QRY for data. Most
 124                          * unfortunate. Stick the new chip in read mode
 125                          * too and if it's the same, assume it's an alias. */
 126                         /* FIXME: Use other modes to do a proper check */
 127                         cfi_qry_mode_off(base, map, cfi);
 128
 129                         if (cfi_qry_present(map, base, cfi)) {
 130                                 xip_allowed(base, map);
 131                                 printk(KERN_DEBUG "%s: Found an alias at 0x%x for the chip at 0x%lx\n",
 132                                        map->name, base, start);
 133                                 return 0;
 134                         }
 135                 }
 136         }
 137
 138         /* OK, if we got to here, then none of the previous chips appear to
 139            be aliases for the current one. */
 140         set_bit((base >> cfi->chipshift), chip_map); /* Update chip map */
 141         cfi->numchips++;
 142
 143         /* Put it back into Read Mode */
 144         cfi_qry_mode_off(base, map, cfi);
 145         xip_allowed(base, map);
 146
 147         printk(KERN_INFO "%s: Found %d x%d devices at 0x%x in %d-bit bank\n",
 148                map->name, cfi->interleave, cfi->device_type*8, base,
 149                map->bankwidth*8);
 150
 151         return 1;
 152 }
 153
 154 static int __xipram cfi_chip_setup(struct map_info *map,
 155                                    struct cfi_private *cfi)
 156 {
 157         int ofs_factor = cfi->interleave*cfi->device_type;
 158         __u32 base = 0;
 159         int num_erase_regions = cfi_read_query(map, base + (0x10 + 28)*ofs_factor);
 160         int i;
 161
 162         xip_enable(base, map, cfi);
 163 #ifdef DEBUG_CFI
 164         printk("Number of erase regions: %d\n", num_erase_regions);
 165 #endif
 166         if (!num_erase_regions)
 167                 return 0;
 168
 169         cfi->cfiq = kmalloc(sizeof(struct cfi_ident) + num_erase_regions * 4, GFP_KERNEL);
 170         if (!cfi->cfiq) {
 171                 printk(KERN_WARNING "%s: kmalloc failed for CFI ident structure\n", map->name);
 172                 return 0;
 173         }
 174
 175         memset(cfi->cfiq,0,sizeof(struct cfi_ident));
 176
 177         cfi->cfi_mode = CFI_MODE_CFI;
 178
 179         /* Read the CFI info structure */
 180         xip_disable_qry(base, map, cfi);
 181         for (i=0; i<(sizeof(struct cfi_ident) + num_erase_regions * 4); i++)
 182                 ((unsigned char *)cfi->cfiq)[i] = cfi_read_query(map,base + (0x10 + i)*ofs_factor);
 183
 184         /* Note we put the device back into Read Mode BEFORE going into Auto
 185          * Select Mode, as some devices support nesting of modes, others
 186          * don't. This way should always work.
 187          * On cmdset 0001 the writes of 0xaa and 0x55 are not needed, and
 188          * so should be treated as nops or illegal (and so put the device
 189          * back into Read Mode, which is a nop in this case).
 190          */
 191         cfi_send_gen_cmd(0xf0,     0, base, map, cfi, cfi->device_type, NULL);
 192         cfi_send_gen_cmd(0xaa, 0x555, base, map, cfi, cfi->device_type, NULL);
 193         cfi_send_gen_cmd(0x55, 0x2aa, base, map, cfi, cfi->device_type, NULL);
 194         cfi_send_gen_cmd(0x90, 0x555, base, map, cfi, cfi->device_type, NULL);
 195         cfi->mfr = cfi_read_query16(map, base);
 196         cfi->id = cfi_read_query16(map, base + ofs_factor);
 197
 198         /* Get AMD/Spansion extended JEDEC ID */
 199         if (cfi->mfr == CFI_MFR_AMD && (cfi->id & 0xff) == 0x7e)
 200                 cfi->id = cfi_read_query(map, base + 0xe * ofs_factor) << 8 |
 201                           cfi_read_query(map, base + 0xf * ofs_factor);
 202
 203         /* Put it back into Read Mode */
 204         cfi_qry_mode_off(base, map, cfi);
 205         xip_allowed(base, map);
 206
 207         /* Do any necessary byteswapping */
 208         cfi->cfiq->P_ID = le16_to_cpu(cfi->cfiq->P_ID);
 209
 210         cfi->cfiq->P_ADR = le16_to_cpu(cfi->cfiq->P_ADR);
 211         cfi->cfiq->A_ID = le16_to_cpu(cfi->cfiq->A_ID);
 212         cfi->cfiq->A_ADR = le16_to_cpu(cfi->cfiq->A_ADR);
 213         cfi->cfiq->InterfaceDesc = le16_to_cpu(cfi->cfiq->InterfaceDesc);
 214         cfi->cfiq->MaxBufWriteSize = le16_to_cpu(cfi->cfiq->MaxBufWriteSize);
 215
 216 #ifdef DEBUG_CFI
 217         /* Dump the information therein */
 218         print_cfi_ident(cfi->cfiq);
 219 #endif
 220
 221         for (i=0; i<cfi->cfiq->NumEraseRegions; i++) {
 222                 cfi->cfiq->EraseRegionInfo[i] = le32_to_cpu(cfi->cfiq->EraseRegionInfo[i]);
 223
 224 #ifdef DEBUG_CFI
 225                 printk("  Erase Region #%d: BlockSize 0x%4.4X bytes, %d blocks\n",
 226                        i, (cfi->cfiq->EraseRegionInfo[i] >> 8) & ~0xff,
 227                        (cfi->cfiq->EraseRegionInfo[i] & 0xffff) + 1);
 228 #endif
 229         }
 230
 231         printk(KERN_INFO "%s: Found %d x%d devices at 0x%x in %d-bit bank\n",
 232                map->name, cfi->interleave, cfi->device_type*8, base,
 233                map->bankwidth*8);
 234
 235         return 1;
 236 }
 237
 238 #ifdef DEBUG_CFI
 239 static char *vendorname(__u16 vendor)
 240 {
 241         switch (vendor) {
 242         case P_ID_NONE:
 243                 return "None";
 244
 245         case P_ID_INTEL_EXT:
 246                 return "Intel/Sharp Extended";
 247
 248         case P_ID_AMD_STD:
 249                 return "AMD/Fujitsu Standard";
 250
 251         case P_ID_INTEL_STD:
 252                 return "Intel/Sharp Standard";
 253
 254         case P_ID_AMD_EXT:
 255                 return "AMD/Fujitsu Extended";
 256
 257         case P_ID_WINBOND:
 258                 return "Winbond Standard";
 259
 260         case P_ID_ST_ADV:
 261                 return "ST Advanced";
 262
 263         case P_ID_MITSUBISHI_STD:
 264                 return "Mitsubishi Standard";
 265
 266         case P_ID_MITSUBISHI_EXT:
 267                 return "Mitsubishi Extended";
 268
 269         case P_ID_SST_PAGE:
 270                 return "SST Page Write";
 271
 272         case P_ID_INTEL_PERFORMANCE:
 273                 return "Intel Performance Code";
 274
 275         case P_ID_INTEL_DATA:
 276                 return "Intel Data";
 277
 278         case P_ID_RESERVED:
 279                 return "Not Allowed / Reserved for Future Use";
 280
 281         default:
 282                 return "Unknown";
 283         }
 284 }
 285
 286
 287 static void print_cfi_ident(struct cfi_ident *cfip)
 288 {
 289 #if 0
 290         if (cfip->qry[0] != 'Q' || cfip->qry[1] != 'R' || cfip->qry[2] != 'Y') {
 291                 printk("Invalid CFI ident structure.\n");
 292                 return;
 293         }
 294 #endif
 295         printk("Primary Vendor Command Set: %4.4X (%s)\n", cfip->P_ID, vendorname(cfip->P_ID));
 296         if (cfip->P_ADR)
 297                 printk("Primary Algorithm Table at %4.4X\n", cfip->P_ADR);
 298         else
 299                 printk("No Primary Algorithm Table\n");
 300
 301         printk("Alternative Vendor Command Set: %4.4X (%s)\n", cfip->A_ID, vendorname(cfip->A_ID));
 302         if (cfip->A_ADR)
 303                 printk("Alternate Algorithm Table at %4.4X\n", cfip->A_ADR);
 304         else
 305                 printk("No Alternate Algorithm Table\n");
 306
 307
 308         printk("Vcc Minimum: %2d.%d V\n", cfip->VccMin >> 4, cfip->VccMin & 0xf);
 309         printk("Vcc Maximum: %2d.%d V\n", cfip->VccMax >> 4, cfip->VccMax & 0xf);
 310         if (cfip->VppMin) {
 311                 printk("Vpp Minimum: %2d.%d V\n", cfip->VppMin >> 4, cfip->VppMin & 0xf);
 312                 printk("Vpp Maximum: %2d.%d V\n", cfip->VppMax >> 4, cfip->VppMax & 0xf);
 313         }
 314         else
 315                 printk("No Vpp line\n");
 316
 317         printk("Typical byte/word write timeout: %d µs\n", 1<<cfip->WordWriteTimeoutTyp);
 318         printk("Maximum byte/word write timeout: %d µs\n", (1<<cfip->WordWriteTimeoutMax) * (1<<cfip->WordWriteTimeoutTyp));
 319
 320         if (cfip->BufWriteTimeoutTyp || cfip->BufWriteTimeoutMax) {
 321                 printk("Typical full buffer write timeout: %d µs\n", 1<<cfip->BufWriteTimeoutTyp);
 322                 printk("Maximum full buffer write timeout: %d µs\n", (1<<cfip->BufWriteTimeoutMax) * (1<<cfip->BufWriteTimeoutTyp));
 323         }
 324         else
 325                 printk("Full buffer write not supported\n");
 326
 327         printk("Typical block erase timeout: %d ms\n", 1<<cfip->BlockEraseTimeoutTyp);
 328         printk("Maximum block erase timeout: %d ms\n", (1<<cfip->BlockEraseTimeoutMax) * (1<<cfip->BlockEraseTimeoutTyp));
 329         if (cfip->ChipEraseTimeoutTyp || cfip->ChipEraseTimeoutMax) {
 330                 printk("Typical chip erase timeout: %d ms\n", 1<<cfip->ChipEraseTimeoutTyp);
 331                 printk("Maximum chip erase timeout: %d ms\n", (1<<cfip->ChipEraseTimeoutMax) * (1<<cfip->ChipEraseTimeoutTyp));
 332         }
 333         else
 334                 printk("Chip erase not supported\n");
 335
 336         printk("Device size: 0x%X bytes (%d MiB)\n", 1 << cfip->DevSize, 1<< (cfip->DevSize - 20));
 337         printk("Flash Device Interface description: 0x%4.4X\n", cfip->InterfaceDesc);
 338         switch(cfip->InterfaceDesc) {
 339         case CFI_INTERFACE_X8_ASYNC:
 340                 printk("  - x8-only asynchronous interface\n");
 341                 break;
 342
 343         case CFI_INTERFACE_X16_ASYNC:
 344                 printk("  - x16-only asynchronous interface\n");
 345                 break;
 346
 347         case CFI_INTERFACE_X8_BY_X16_ASYNC:
 348                 printk("  - supports x8 and x16 via BYTE# with asynchronous interface\n");
 349                 break;
 350
 351         case CFI_INTERFACE_X32_ASYNC:
 352                 printk("  - x32-only asynchronous interface\n");
 353                 break;
 354
 355         case CFI_INTERFACE_X16_BY_X32_ASYNC:
 356                 printk("  - supports x16 and x32 via Word# with asynchronous interface\n");
 357                 break;
 358
 359         case CFI_INTERFACE_NOT_ALLOWED:
 360                 printk("  - Not Allowed / Reserved\n");
 361                 break;
 362
 363         default:
 364                 printk("  - Unknown\n");
 365                 break;
 366         }
 367
 368         printk("Max. bytes in buffer write: 0x%x\n", 1<< cfip->MaxBufWriteSize);
 369         printk("Number of Erase Block Regions: %d\n", cfip->NumEraseRegions);
 370
 371 }
 372 #endif /* DEBUG_CFI */
 373
 374 static struct chip_probe cfi_chip_probe = {
 375         .name           = "CFI",
 376         .probe_chip     = cfi_probe_chip
 377 };
 378
 379 struct mtd_info *cfi_probe(struct map_info *map)
 380 {
 381         /*
 382          * Just use the generic probe stuff to call our CFI-specific
 383          * chip_probe routine in all the possible permutations, etc.
 384          */
 385         return mtd_do_chip_probe(map, &cfi_chip_probe);
 386 }
 387
 388 static struct mtd_chip_driver cfi_chipdrv = {
 389         .probe          = cfi_probe,
 390         .name           = "cfi_probe",
 391         .module         = THIS_MODULE
 392 };
 393
 394 static int __init cfi_probe_init(void)
 395 {
 396         register_mtd_chip_driver(&cfi_chipdrv);
 397         return 0;
 398 }
 399
 400 static void __exit cfi_probe_exit(void)
 401 {
 402         unregister_mtd_chip_driver(&cfi_chipdrv);
 403 }
 404
 405 module_init(cfi_probe_init);
 406 module_exit(cfi_probe_exit);
 407
 408 MODULE_LICENSE("GPL");
 409 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org> et al.");
 410 MODULE_DESCRIPTION("Probe code for CFI-compliant flash chips");