drivers/mtd/chips/cfi_probe.c

   1 /*
   2    Common Flash Interface probe code.
   3    (C) 2000 Red Hat. GPL'd.
   4    $Id: cfi_probe.c,v 1.86 2005/11/29 14:48:31 gleixner Exp $
   5 */
   6
   7 #include <linux/config.h>
   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 <asm/byteorder.h>
  14 #include <linux/errno.h>
  15 #include <linux/slab.h>
  16 #include <linux/interrupt.h>
  17
  18 #include <linux/mtd/xip.h>
  19 #include <linux/mtd/map.h>
  20 #include <linux/mtd/cfi.h>
  21 #include <linux/mtd/gen_probe.h>
  22
  23 //#define DEBUG_CFI
  24
  25 #ifdef DEBUG_CFI
  26 static void print_cfi_ident(struct cfi_ident *);
  27 #endif
  28
  29 static int cfi_probe_chip(struct map_info *map, __u32 base,
  30                           unsigned long *chip_map, struct cfi_private *cfi);
  31 static int cfi_chip_setup(struct map_info *map, struct cfi_private *cfi);
  32
  33 struct mtd_info *cfi_probe(struct map_info *map);
  34
  35 #ifdef CONFIG_MTD_XIP
  36
  37 /* only needed for short periods, so this is rather simple */
  38 #define xip_disable()   local_irq_disable()
  39
  40 #define xip_allowed(base, map) \
  41 do { \
  42         (void) map_read(map, base); \
  43         asm volatile (".rep 8; nop; .endr"); \
  44         local_irq_enable(); \
  45 } while (0)
  46
  47 #define xip_enable(base, map, cfi) \
  48 do { \
  49         cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL); \
  50         cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL); \
  51         xip_allowed(base, map); \
  52 } while (0)
  53
  54 #define xip_disable_qry(base, map, cfi) \
  55 do { \
  56         xip_disable(); \
  57         cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL); \
  58         cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL); \
  59         cfi_send_gen_cmd(0x98, 0x55, base, map, cfi, cfi->device_type, NULL); \
  60 } while (0)
  61
  62 #else
  63
  64 #define xip_disable()                   do { } while (0)
  65 #define xip_allowed(base, map)          do { } while (0)
  66 #define xip_enable(base, map, cfi)      do { } while (0)
  67 #define xip_disable_qry(base, map, cfi) do { } while (0)
  68
  69 #endif
  70
  71 /* check for QRY.
  72    in: interleave,type,mode
  73    ret: table index, <0 for error
  74  */
  75 static int __xipram qry_present(struct map_info *map, __u32 base,
  76                                 struct cfi_private *cfi)
  77 {
  78         int osf = cfi->interleave * cfi->device_type;   // scale factor
  79         map_word val[3];
  80         map_word qry[3];
  81
  82         qry[0] = cfi_build_cmd('Q', map, cfi);
  83         qry[1] = cfi_build_cmd('R', map, cfi);
  84         qry[2] = cfi_build_cmd('Y', map, cfi);
  85
  86         val[0] = map_read(map, base + osf*0x10);
  87         val[1] = map_read(map, base + osf*0x11);
  88         val[2] = map_read(map, base + osf*0x12);
  89
  90         if (!map_word_equal(map, qry[0], val[0]))
  91                 return 0;
  92
  93         if (!map_word_equal(map, qry[1], val[1]))
  94                 return 0;
  95
  96         if (!map_word_equal(map, qry[2], val[2]))
  97                 return 0;
  98
  99         return 1;       // "QRY" found
 100 }
 101
 102 static int __xipram cfi_probe_chip(struct map_info *map, __u32 base,
 103                                    unsigned long *chip_map, struct cfi_private *cfi)
 104 {
 105         int i;
 106
 107         if ((base + 0) >= map->size) {
 108                 printk(KERN_NOTICE
 109                         "Probe at base[0x00](0x%08lx) past the end of the map(0x%08lx)\n",
 110                         (unsigned long)base, map->size -1);
 111                 return 0;
 112         }
 113         if ((base + 0xff) >= map->size) {
 114                 printk(KERN_NOTICE
 115                         "Probe at base[0x55](0x%08lx) past the end of the map(0x%08lx)\n",
 116                         (unsigned long)base + 0x55, map->size -1);
 117                 return 0;
 118         }
 119
 120         xip_disable();
 121         cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
 122         cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL);
 123         cfi_send_gen_cmd(0x98, 0x55, base, map, cfi, cfi->device_type, NULL);
 124
 125         if (!qry_present(map,base,cfi)) {
 126                 xip_enable(base, map, cfi);
 127                 return 0;
 128         }
 129
 130         if (!cfi->numchips) {
 131                 /* This is the first time we're called. Set up the CFI
 132                    stuff accordingly and return */
 133                 return cfi_chip_setup(map, cfi);
 134         }
 135
 136         /* Check each previous chip to see if it's an alias */
 137         for (i=0; i < (base >> cfi->chipshift); i++) {
 138                 unsigned long start;
 139                 if(!test_bit(i, chip_map)) {
 140                         /* Skip location; no valid chip at this address */
 141                         continue;
 142                 }
 143                 start = i << cfi->chipshift;
 144                 /* This chip should be in read mode if it's one
 145                    we've already touched. */
 146                 if (qry_present(map, start, cfi)) {
 147                         /* Eep. This chip also had the QRY marker.
 148                          * Is it an alias for the new one? */
 149                         cfi_send_gen_cmd(0xF0, 0, start, map, cfi, cfi->device_type, NULL);
 150                         cfi_send_gen_cmd(0xFF, 0, start, map, cfi, cfi->device_type, NULL);
 151
 152                         /* If the QRY marker goes away, it's an alias */
 153                         if (!qry_present(map, start, cfi)) {
 154                                 xip_allowed(base, map);
 155                                 printk(KERN_DEBUG "%s: Found an alias at 0x%x for the chip at 0x%lx\n",
 156                                        map->name, base, start);
 157                                 return 0;
 158                         }
 159                         /* Yes, it's actually got QRY for data. Most
 160                          * unfortunate. Stick the new chip in read mode
 161                          * too and if it's the same, assume it's an alias. */
 162                         /* FIXME: Use other modes to do a proper check */
 163                         cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
 164                         cfi_send_gen_cmd(0xFF, 0, start, map, cfi, cfi->device_type, NULL);
 165
 166                         if (qry_present(map, base, cfi)) {
 167                                 xip_allowed(base, map);
 168                                 printk(KERN_DEBUG "%s: Found an alias at 0x%x for the chip at 0x%lx\n",
 169                                        map->name, base, start);
 170                                 return 0;
 171                         }
 172                 }
 173         }
 174
 175         /* OK, if we got to here, then none of the previous chips appear to
 176            be aliases for the current one. */
 177         set_bit((base >> cfi->chipshift), chip_map); /* Update chip map */
 178         cfi->numchips++;
 179
 180         /* Put it back into Read Mode */
 181         cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
 182         cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL);
 183         xip_allowed(base, map);
 184
 185         printk(KERN_INFO "%s: Found %d x%d devices at 0x%x in %d-bit bank\n",
 186                map->name, cfi->interleave, cfi->device_type*8, base,
 187                map->bankwidth*8);
 188
 189         return 1;
 190 }
 191
 192 static int __xipram cfi_chip_setup(struct map_info *map,
 193                                    struct cfi_private *cfi)
 194 {
 195         int ofs_factor = cfi->interleave*cfi->device_type;
 196         __u32 base = 0;
 197         int num_erase_regions = cfi_read_query(map, base + (0x10 + 28)*ofs_factor);
 198         int i;
 199
 200         xip_enable(base, map, cfi);
 201 #ifdef DEBUG_CFI
 202         printk("Number of erase regions: %d\n", num_erase_regions);
 203 #endif
 204         if (!num_erase_regions)
 205                 return 0;
 206
 207         cfi->cfiq = kmalloc(sizeof(struct cfi_ident) + num_erase_regions * 4, GFP_KERNEL);
 208         if (!cfi->cfiq) {
 209                 printk(KERN_WARNING "%s: kmalloc failed for CFI ident structure\n", map->name);
 210                 return 0;
 211         }
 212
 213         memset(cfi->cfiq,0,sizeof(struct cfi_ident));
 214
 215         cfi->cfi_mode = CFI_MODE_CFI;
 216
 217         /* Read the CFI info structure */
 218         xip_disable_qry(base, map, cfi);
 219         for (i=0; i<(sizeof(struct cfi_ident) + num_erase_regions * 4); i++)
 220                 ((unsigned char *)cfi->cfiq)[i] = cfi_read_query(map,base + (0x10 + i)*ofs_factor);
 221
 222         /* Note we put the device back into Read Mode BEFORE going into Auto
 223          * Select Mode, as some devices support nesting of modes, others
 224          * don't. This way should always work.
 225          * On cmdset 0001 the writes of 0xaa and 0x55 are not needed, and
 226          * so should be treated as nops or illegal (and so put the device
 227          * back into Read Mode, which is a nop in this case).
 228          */
 229         cfi_send_gen_cmd(0xf0,     0, base, map, cfi, cfi->device_type, NULL);
 230         cfi_send_gen_cmd(0xaa, 0x555, base, map, cfi, cfi->device_type, NULL);
 231         cfi_send_gen_cmd(0x55, 0x2aa, base, map, cfi, cfi->device_type, NULL);
 232         cfi_send_gen_cmd(0x90, 0x555, base, map, cfi, cfi->device_type, NULL);
 233         cfi->mfr = cfi_read_query16(map, base);
 234         cfi->id = cfi_read_query16(map, base + ofs_factor);
 235
 236         /* Put it back into Read Mode */
 237         cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
 238         /* ... even if it's an Intel chip */
 239         cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL);
 240         xip_allowed(base, map);
 241
 242         /* Do any necessary byteswapping */
 243         cfi->cfiq->P_ID = le16_to_cpu(cfi->cfiq->P_ID);
 244
 245         cfi->cfiq->P_ADR = le16_to_cpu(cfi->cfiq->P_ADR);
 246         cfi->cfiq->A_ID = le16_to_cpu(cfi->cfiq->A_ID);
 247         cfi->cfiq->A_ADR = le16_to_cpu(cfi->cfiq->A_ADR);
 248         cfi->cfiq->InterfaceDesc = le16_to_cpu(cfi->cfiq->InterfaceDesc);
 249         cfi->cfiq->MaxBufWriteSize = le16_to_cpu(cfi->cfiq->MaxBufWriteSize);
 250
 251 #ifdef DEBUG_CFI
 252         /* Dump the information therein */
 253         print_cfi_ident(cfi->cfiq);
 254 #endif
 255
 256         for (i=0; i<cfi->cfiq->NumEraseRegions; i++) {
 257                 cfi->cfiq->EraseRegionInfo[i] = le32_to_cpu(cfi->cfiq->EraseRegionInfo[i]);
 258
 259 #ifdef DEBUG_CFI
 260                 printk("  Erase Region #%d: BlockSize 0x%4.4X bytes, %d blocks\n",
 261                        i, (cfi->cfiq->EraseRegionInfo[i] >> 8) & ~0xff,
 262                        (cfi->cfiq->EraseRegionInfo[i] & 0xffff) + 1);
 263 #endif
 264         }
 265
 266         printk(KERN_INFO "%s: Found %d x%d devices at 0x%x in %d-bit bank\n",
 267                map->name, cfi->interleave, cfi->device_type*8, base,
 268                map->bankwidth*8);
 269
 270         return 1;
 271 }
 272
 273 #ifdef DEBUG_CFI
 274 static char *vendorname(__u16 vendor)
 275 {
 276         switch (vendor) {
 277         case P_ID_NONE:
 278                 return "None";
 279
 280         case P_ID_INTEL_EXT:
 281                 return "Intel/Sharp Extended";
 282
 283         case P_ID_AMD_STD:
 284                 return "AMD/Fujitsu Standard";
 285
 286         case P_ID_INTEL_STD:
 287                 return "Intel/Sharp Standard";
 288
 289         case P_ID_AMD_EXT:
 290                 return "AMD/Fujitsu Extended";
 291
 292         case P_ID_WINBOND:
 293                 return "Winbond Standard";
 294
 295         case P_ID_ST_ADV:
 296                 return "ST Advanced";
 297
 298         case P_ID_MITSUBISHI_STD:
 299                 return "Mitsubishi Standard";
 300
 301         case P_ID_MITSUBISHI_EXT:
 302                 return "Mitsubishi Extended";
 303
 304         case P_ID_SST_PAGE:
 305                 return "SST Page Write";
 306
 307         case P_ID_INTEL_PERFORMANCE:
 308                 return "Intel Performance Code";
 309
 310         case P_ID_INTEL_DATA:
 311                 return "Intel Data";
 312
 313         case P_ID_RESERVED:
 314                 return "Not Allowed / Reserved for Future Use";
 315
 316         default:
 317                 return "Unknown";
 318         }
 319 }
 320
 321
 322 static void print_cfi_ident(struct cfi_ident *cfip)
 323 {
 324 #if 0
 325         if (cfip->qry[0] != 'Q' || cfip->qry[1] != 'R' || cfip->qry[2] != 'Y') {
 326                 printk("Invalid CFI ident structure.\n");
 327                 return;
 328         }
 329 #endif
 330         printk("Primary Vendor Command Set: %4.4X (%s)\n", cfip->P_ID, vendorname(cfip->P_ID));
 331         if (cfip->P_ADR)
 332                 printk("Primary Algorithm Table at %4.4X\n", cfip->P_ADR);
 333         else
 334                 printk("No Primary Algorithm Table\n");
 335
 336         printk("Alternative Vendor Command Set: %4.4X (%s)\n", cfip->A_ID, vendorname(cfip->A_ID));
 337         if (cfip->A_ADR)
 338                 printk("Alternate Algorithm Table at %4.4X\n", cfip->A_ADR);
 339         else
 340                 printk("No Alternate Algorithm Table\n");
 341
 342
 343         printk("Vcc Minimum: %2d.%d V\n", cfip->VccMin >> 4, cfip->VccMin & 0xf);
 344         printk("Vcc Maximum: %2d.%d V\n", cfip->VccMax >> 4, cfip->VccMax & 0xf);
 345         if (cfip->VppMin) {
 346                 printk("Vpp Minimum: %2d.%d V\n", cfip->VppMin >> 4, cfip->VppMin & 0xf);
 347                 printk("Vpp Maximum: %2d.%d V\n", cfip->VppMax >> 4, cfip->VppMax & 0xf);
 348         }
 349         else
 350                 printk("No Vpp line\n");
 351
 352         printk("Typical byte/word write timeout: %d µs\n", 1<<cfip->WordWriteTimeoutTyp);
 353         printk("Maximum byte/word write timeout: %d µs\n", (1<<cfip->WordWriteTimeoutMax) * (1<<cfip->WordWriteTimeoutTyp));
 354
 355         if (cfip->BufWriteTimeoutTyp || cfip->BufWriteTimeoutMax) {
 356                 printk("Typical full buffer write timeout: %d µs\n", 1<<cfip->BufWriteTimeoutTyp);
 357                 printk("Maximum full buffer write timeout: %d µs\n", (1<<cfip->BufWriteTimeoutMax) * (1<<cfip->BufWriteTimeoutTyp));
 358         }
 359         else
 360                 printk("Full buffer write not supported\n");
 361
 362         printk("Typical block erase timeout: %d ms\n", 1<<cfip->BlockEraseTimeoutTyp);
 363         printk("Maximum block erase timeout: %d ms\n", (1<<cfip->BlockEraseTimeoutMax) * (1<<cfip->BlockEraseTimeoutTyp));
 364         if (cfip->ChipEraseTimeoutTyp || cfip->ChipEraseTimeoutMax) {
 365                 printk("Typical chip erase timeout: %d ms\n", 1<<cfip->ChipEraseTimeoutTyp);
 366                 printk("Maximum chip erase timeout: %d ms\n", (1<<cfip->ChipEraseTimeoutMax) * (1<<cfip->ChipEraseTimeoutTyp));
 367         }
 368         else
 369                 printk("Chip erase not supported\n");
 370
 371         printk("Device size: 0x%X bytes (%d MiB)\n", 1 << cfip->DevSize, 1<< (cfip->DevSize - 20));
 372         printk("Flash Device Interface description: 0x%4.4X\n", cfip->InterfaceDesc);
 373         switch(cfip->InterfaceDesc) {
 374         case 0:
 375                 printk("  - x8-only asynchronous interface\n");
 376                 break;
 377
 378         case 1:
 379                 printk("  - x16-only asynchronous interface\n");
 380                 break;
 381
 382         case 2:
 383                 printk("  - supports x8 and x16 via BYTE# with asynchronous interface\n");
 384                 break;
 385
 386         case 3:
 387                 printk("  - x32-only asynchronous interface\n");
 388                 break;
 389
 390         case 4:
 391                 printk("  - supports x16 and x32 via Word# with asynchronous interface\n");
 392                 break;
 393
 394         case 65535:
 395                 printk("  - Not Allowed / Reserved\n");
 396                 break;
 397
 398         default:
 399                 printk("  - Unknown\n");
 400                 break;
 401         }
 402
 403         printk("Max. bytes in buffer write: 0x%x\n", 1<< cfip->MaxBufWriteSize);
 404         printk("Number of Erase Block Regions: %d\n", cfip->NumEraseRegions);
 405
 406 }
 407 #endif /* DEBUG_CFI */
 408
 409 static struct chip_probe cfi_chip_probe = {
 410         .name           = "CFI",
 411         .probe_chip     = cfi_probe_chip
 412 };
 413
 414 struct mtd_info *cfi_probe(struct map_info *map)
 415 {
 416         /*
 417          * Just use the generic probe stuff to call our CFI-specific
 418          * chip_probe routine in all the possible permutations, etc.
 419          */
 420         return mtd_do_chip_probe(map, &cfi_chip_probe);
 421 }
 422
 423 static struct mtd_chip_driver cfi_chipdrv = {
 424         .probe          = cfi_probe,
 425         .name           = "cfi_probe",
 426         .module         = THIS_MODULE
 427 };
 428
 429 static int __init cfi_probe_init(void)
 430 {
 431         register_mtd_chip_driver(&cfi_chipdrv);
 432         return 0;
 433 }
 434
 435 static void __exit cfi_probe_exit(void)
 436 {
 437         unregister_mtd_chip_driver(&cfi_chipdrv);
 438 }
 439
 440 module_init(cfi_probe_init);
 441 module_exit(cfi_probe_exit);
 442
 443 MODULE_LICENSE("GPL");
 444 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org> et al.");
 445 MODULE_DESCRIPTION("Probe code for CFI-compliant flash chips");