drivers/mtd/chips/cfi_probe.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3    Common Flash Interface probe code.
   4    (C) 2000 Red Hat.
   5 */
   6
   7 #include <linux/module.h>
   8 #include <linux/types.h>
   9 #include <linux/kernel.h>
  10 #include <linux/init.h>
  11 #include <asm/io.h>
  12 #include <asm/byteorder.h>
  13 #include <linux/errno.h>
  14 #include <linux/slab.h>
  15 #include <linux/interrupt.h>
  16
  17 #include <linux/mtd/xip.h>
  18 #include <linux/mtd/map.h>
  19 #include <linux/mtd/cfi.h>
  20 #include <linux/mtd/gen_probe.h>
  21
  22 //#define DEBUG_CFI
  23
  24 #ifdef DEBUG_CFI
  25 static void print_cfi_ident(struct cfi_ident *);
  26 #endif
  27
  28 static int cfi_probe_chip(struct map_info *map, __u32 base,
  29                           unsigned long *chip_map, struct cfi_private *cfi);
  30 static int cfi_chip_setup(struct map_info *map, struct cfi_private *cfi);
  31
  32 struct mtd_info *cfi_probe(struct map_info *map);
  33
  34 #ifdef CONFIG_MTD_XIP
  35
  36 /* only needed for short periods, so this is rather simple */
  37 #define xip_disable()   local_irq_disable()
  38
  39 #define xip_allowed(base, map) \
  40 do { \
  41         (void) map_read(map, base); \
  42         xip_iprefetch(); \
  43         local_irq_enable(); \
  44 } while (0)
  45
  46 #define xip_enable(base, map, cfi) \
  47 do { \
  48         cfi_qry_mode_off(base, map, cfi);               \
  49         xip_allowed(base, map); \
  50 } while (0)
  51
  52 #define xip_disable_qry(base, map, cfi) \
  53 do { \
  54         xip_disable(); \
  55         cfi_qry_mode_on(base, map, cfi); \
  56 } while (0)
  57
  58 #else
  59
  60 #define xip_disable()                   do { } while (0)
  61 #define xip_allowed(base, map)          do { } while (0)
  62 #define xip_enable(base, map, cfi)      do { } while (0)
  63 #define xip_disable_qry(base, map, cfi) do { } while (0)
  64
  65 #endif
  66
  67 /*
  68  * This fixup occurs immediately after reading the CFI structure and can affect
  69  * the number of chips detected, unlike cfi_fixup, which occurs after an
  70  * mtd_info structure has been created for the chip.
  71  */
  72 struct cfi_early_fixup {
  73         uint16_t mfr;
  74         uint16_t id;
  75         void (*fixup)(struct cfi_private *cfi);
  76 };
  77
  78 static void cfi_early_fixup(struct cfi_private *cfi,
  79                             const struct cfi_early_fixup *fixups)
  80 {
  81         const struct cfi_early_fixup *f;
  82
  83         for (f = fixups; f->fixup; f++) {
  84                 if (((f->mfr == CFI_MFR_ANY) || (f->mfr == cfi->mfr)) &&
  85                     ((f->id == CFI_ID_ANY) || (f->id == cfi->id))) {
  86                         f->fixup(cfi);
  87                 }
  88         }
  89 }
  90
  91 /* check for QRY.
  92    in: interleave,type,mode
  93    ret: table index, <0 for error
  94  */
  95
  96 static int __xipram cfi_probe_chip(struct map_info *map, __u32 base,
  97                                    unsigned long *chip_map, struct cfi_private *cfi)
  98 {
  99         int i;
 100
 101         if ((base + 0) >= map->size) {
 102                 printk(KERN_NOTICE
 103                         "Probe at base[0x00](0x%08lx) past the end of the map(0x%08lx)\n",
 104                         (unsigned long)base, map->size -1);
 105                 return 0;
 106         }
 107         if ((base + 0xff) >= map->size) {
 108                 printk(KERN_NOTICE
 109                         "Probe at base[0x55](0x%08lx) past the end of the map(0x%08lx)\n",
 110                         (unsigned long)base + 0x55, map->size -1);
 111                 return 0;
 112         }
 113
 114         xip_disable();
 115         if (!cfi_qry_mode_on(base, map, cfi)) {
 116                 xip_enable(base, map, cfi);
 117                 return 0;
 118         }
 119
 120         if (!cfi->numchips) {
 121                 /* This is the first time we're called. Set up the CFI
 122                    stuff accordingly and return */
 123                 return cfi_chip_setup(map, cfi);
 124         }
 125
 126         /* Check each previous chip to see if it's an alias */
 127         for (i=0; i < (base >> cfi->chipshift); i++) {
 128                 unsigned long start;
 129                 if(!test_bit(i, chip_map)) {
 130                         /* Skip location; no valid chip at this address */
 131                         continue;
 132                 }
 133                 start = i << cfi->chipshift;
 134                 /* This chip should be in read mode if it's one
 135                    we've already touched. */
 136                 if (cfi_qry_present(map, start, cfi)) {
 137                         /* Eep. This chip also had the QRY marker.
 138                          * Is it an alias for the new one? */
 139                         cfi_qry_mode_off(start, map, cfi);
 140
 141                         /* If the QRY marker goes away, it's an alias */
 142                         if (!cfi_qry_present(map, start, cfi)) {
 143                                 xip_allowed(base, map);
 144                                 printk(KERN_DEBUG "%s: Found an alias at 0x%x for the chip at 0x%lx\n",
 145                                        map->name, base, start);
 146                                 return 0;
 147                         }
 148                         /* Yes, it's actually got QRY for data. Most
 149                          * unfortunate. Stick the new chip in read mode
 150                          * too and if it's the same, assume it's an alias. */
 151                         /* FIXME: Use other modes to do a proper check */
 152                         cfi_qry_mode_off(base, map, cfi);
 153
 154                         if (cfi_qry_present(map, base, cfi)) {
 155                                 xip_allowed(base, map);
 156                                 printk(KERN_DEBUG "%s: Found an alias at 0x%x for the chip at 0x%lx\n",
 157                                        map->name, base, start);
 158                                 return 0;
 159                         }
 160                 }
 161         }
 162
 163         /* OK, if we got to here, then none of the previous chips appear to
 164            be aliases for the current one. */
 165         set_bit((base >> cfi->chipshift), chip_map); /* Update chip map */
 166         cfi->numchips++;
 167
 168         /* Put it back into Read Mode */
 169         cfi_qry_mode_off(base, map, cfi);
 170         xip_allowed(base, map);
 171
 172         printk(KERN_INFO "%s: Found %d x%d devices at 0x%x in %d-bit bank\n",
 173                map->name, cfi->interleave, cfi->device_type*8, base,
 174                map->bankwidth*8);
 175
 176         return 1;
 177 }
 178
 179 static void fixup_s70gl02gs_chips(struct cfi_private *cfi)
 180 {
 181         /*
 182          * S70GL02GS flash reports a single 256 MiB chip, but is really made up
 183          * of two 128 MiB chips with 1024 sectors each.
 184          */
 185         cfi->cfiq->DevSize = 27;
 186         cfi->cfiq->EraseRegionInfo[0] = 0x20003ff;
 187         pr_warn("Bad S70GL02GS CFI data; adjust to detect 2 chips\n");
 188 }
 189
 190 static const struct cfi_early_fixup cfi_early_fixup_table[] = {
 191         { CFI_MFR_AMD, 0x4801, fixup_s70gl02gs_chips },
 192         { },
 193 };
 194
 195 static int __xipram cfi_chip_setup(struct map_info *map,
 196                                    struct cfi_private *cfi)
 197 {
 198         int ofs_factor = cfi->interleave*cfi->device_type;
 199         __u32 base = 0;
 200         int num_erase_regions = cfi_read_query(map, base + (0x10 + 28)*ofs_factor);
 201         int i;
 202         int addr_unlock1 = 0x555, addr_unlock2 = 0x2AA;
 203
 204         xip_enable(base, map, cfi);
 205 #ifdef DEBUG_CFI
 206         printk("Number of erase regions: %d\n", num_erase_regions);
 207 #endif
 208         if (!num_erase_regions)
 209                 return 0;
 210
 211         cfi->cfiq = kmalloc(sizeof(struct cfi_ident) + num_erase_regions * 4, GFP_KERNEL);
 212         if (!cfi->cfiq)
 213                 return 0;
 214
 215         memset(cfi->cfiq,0,sizeof(struct cfi_ident));
 216
 217         cfi->cfi_mode = CFI_MODE_CFI;
 218
 219         cfi->sector_erase_cmd = CMD(0x30);
 220
 221         /* Read the CFI info structure */
 222         xip_disable_qry(base, map, cfi);
 223         for (i=0; i<(sizeof(struct cfi_ident) + num_erase_regions * 4); i++)
 224                 ((unsigned char *)cfi->cfiq)[i] = cfi_read_query(map,base + (0x10 + i)*ofs_factor);
 225
 226         /* Do any necessary byteswapping */
 227         cfi->cfiq->P_ID = le16_to_cpu(cfi->cfiq->P_ID);
 228
 229         cfi->cfiq->P_ADR = le16_to_cpu(cfi->cfiq->P_ADR);
 230         cfi->cfiq->A_ID = le16_to_cpu(cfi->cfiq->A_ID);
 231         cfi->cfiq->A_ADR = le16_to_cpu(cfi->cfiq->A_ADR);
 232         cfi->cfiq->InterfaceDesc = le16_to_cpu(cfi->cfiq->InterfaceDesc);
 233         cfi->cfiq->MaxBufWriteSize = le16_to_cpu(cfi->cfiq->MaxBufWriteSize);
 234
 235 #ifdef DEBUG_CFI
 236         /* Dump the information therein */
 237         print_cfi_ident(cfi->cfiq);
 238 #endif
 239
 240         for (i=0; i<cfi->cfiq->NumEraseRegions; i++) {
 241                 cfi->cfiq->EraseRegionInfo[i] = le32_to_cpu(cfi->cfiq->EraseRegionInfo[i]);
 242
 243 #ifdef DEBUG_CFI
 244                 printk("  Erase Region #%d: BlockSize 0x%4.4X bytes, %d blocks\n",
 245                        i, (cfi->cfiq->EraseRegionInfo[i] >> 8) & ~0xff,
 246                        (cfi->cfiq->EraseRegionInfo[i] & 0xffff) + 1);
 247 #endif
 248         }
 249
 250         if (cfi->cfiq->P_ID == P_ID_SST_OLD) {
 251                 addr_unlock1 = 0x5555;
 252                 addr_unlock2 = 0x2AAA;
 253         }
 254
 255         /*
 256          * Note we put the device back into Read Mode BEFORE going into Auto
 257          * Select Mode, as some devices support nesting of modes, others
 258          * don't. This way should always work.
 259          * On cmdset 0001 the writes of 0xaa and 0x55 are not needed, and
 260          * so should be treated as nops or illegal (and so put the device
 261          * back into Read Mode, which is a nop in this case).
 262          */
 263         cfi_send_gen_cmd(0xf0,     0, base, map, cfi, cfi->device_type, NULL);
 264         cfi_send_gen_cmd(0xaa, addr_unlock1, base, map, cfi, cfi->device_type, NULL);
 265         cfi_send_gen_cmd(0x55, addr_unlock2, base, map, cfi, cfi->device_type, NULL);
 266         cfi_send_gen_cmd(0x90, addr_unlock1, base, map, cfi, cfi->device_type, NULL);
 267         cfi->mfr = cfi_read_query16(map, base);
 268         cfi->id = cfi_read_query16(map, base + ofs_factor);
 269
 270         /* Get AMD/Spansion extended JEDEC ID */
 271         if (cfi->mfr == CFI_MFR_AMD && (cfi->id & 0xff) == 0x7e)
 272                 cfi->id = cfi_read_query(map, base + 0xe * ofs_factor) << 8 |
 273                           cfi_read_query(map, base + 0xf * ofs_factor);
 274
 275         /* Put it back into Read Mode */
 276         cfi_qry_mode_off(base, map, cfi);
 277         xip_allowed(base, map);
 278
 279         cfi_early_fixup(cfi, cfi_early_fixup_table);
 280
 281         printk(KERN_INFO "%s: Found %d x%d devices at 0x%x in %d-bit bank. Manufacturer ID %#08x Chip ID %#08x\n",
 282                map->name, cfi->interleave, cfi->device_type*8, base,
 283                map->bankwidth*8, cfi->mfr, cfi->id);
 284
 285         return 1;
 286 }
 287
 288 #ifdef DEBUG_CFI
 289 static char *vendorname(__u16 vendor)
 290 {
 291         switch (vendor) {
 292         case P_ID_NONE:
 293                 return "None";
 294
 295         case P_ID_INTEL_EXT:
 296                 return "Intel/Sharp Extended";
 297
 298         case P_ID_AMD_STD:
 299                 return "AMD/Fujitsu Standard";
 300
 301         case P_ID_INTEL_STD:
 302                 return "Intel/Sharp Standard";
 303
 304         case P_ID_AMD_EXT:
 305                 return "AMD/Fujitsu Extended";
 306
 307         case P_ID_WINBOND:
 308                 return "Winbond Standard";
 309
 310         case P_ID_ST_ADV:
 311                 return "ST Advanced";
 312
 313         case P_ID_MITSUBISHI_STD:
 314                 return "Mitsubishi Standard";
 315
 316         case P_ID_MITSUBISHI_EXT:
 317                 return "Mitsubishi Extended";
 318
 319         case P_ID_SST_PAGE:
 320                 return "SST Page Write";
 321
 322         case P_ID_SST_OLD:
 323                 return "SST 39VF160x/39VF320x";
 324
 325         case P_ID_INTEL_PERFORMANCE:
 326                 return "Intel Performance Code";
 327
 328         case P_ID_INTEL_DATA:
 329                 return "Intel Data";
 330
 331         case P_ID_RESERVED:
 332                 return "Not Allowed / Reserved for Future Use";
 333
 334         default:
 335                 return "Unknown";
 336         }
 337 }
 338
 339
 340 static void print_cfi_ident(struct cfi_ident *cfip)
 341 {
 342 #if 0
 343         if (cfip->qry[0] != 'Q' || cfip->qry[1] != 'R' || cfip->qry[2] != 'Y') {
 344                 printk("Invalid CFI ident structure.\n");
 345                 return;
 346         }
 347 #endif
 348         printk("Primary Vendor Command Set: %4.4X (%s)\n", cfip->P_ID, vendorname(cfip->P_ID));
 349         if (cfip->P_ADR)
 350                 printk("Primary Algorithm Table at %4.4X\n", cfip->P_ADR);
 351         else
 352                 printk("No Primary Algorithm Table\n");
 353
 354         printk("Alternative Vendor Command Set: %4.4X (%s)\n", cfip->A_ID, vendorname(cfip->A_ID));
 355         if (cfip->A_ADR)
 356                 printk("Alternate Algorithm Table at %4.4X\n", cfip->A_ADR);
 357         else
 358                 printk("No Alternate Algorithm Table\n");
 359
 360
 361         printk("Vcc Minimum: %2d.%d V\n", cfip->VccMin >> 4, cfip->VccMin & 0xf);
 362         printk("Vcc Maximum: %2d.%d V\n", cfip->VccMax >> 4, cfip->VccMax & 0xf);
 363         if (cfip->VppMin) {
 364                 printk("Vpp Minimum: %2d.%d V\n", cfip->VppMin >> 4, cfip->VppMin & 0xf);
 365                 printk("Vpp Maximum: %2d.%d V\n", cfip->VppMax >> 4, cfip->VppMax & 0xf);
 366         }
 367         else
 368                 printk("No Vpp line\n");
 369
 370         printk("Typical byte/word write timeout: %d µs\n", 1<<cfip->WordWriteTimeoutTyp);
 371         printk("Maximum byte/word write timeout: %d µs\n", (1<<cfip->WordWriteTimeoutMax) * (1<<cfip->WordWriteTimeoutTyp));
 372
 373         if (cfip->BufWriteTimeoutTyp || cfip->BufWriteTimeoutMax) {
 374                 printk("Typical full buffer write timeout: %d µs\n", 1<<cfip->BufWriteTimeoutTyp);
 375                 printk("Maximum full buffer write timeout: %d µs\n", (1<<cfip->BufWriteTimeoutMax) * (1<<cfip->BufWriteTimeoutTyp));
 376         }
 377         else
 378                 printk("Full buffer write not supported\n");
 379
 380         printk("Typical block erase timeout: %d ms\n", 1<<cfip->BlockEraseTimeoutTyp);
 381         printk("Maximum block erase timeout: %d ms\n", (1<<cfip->BlockEraseTimeoutMax) * (1<<cfip->BlockEraseTimeoutTyp));
 382         if (cfip->ChipEraseTimeoutTyp || cfip->ChipEraseTimeoutMax) {
 383                 printk("Typical chip erase timeout: %d ms\n", 1<<cfip->ChipEraseTimeoutTyp);
 384                 printk("Maximum chip erase timeout: %d ms\n", (1<<cfip->ChipEraseTimeoutMax) * (1<<cfip->ChipEraseTimeoutTyp));
 385         }
 386         else
 387                 printk("Chip erase not supported\n");
 388
 389         printk("Device size: 0x%X bytes (%d MiB)\n", 1 << cfip->DevSize, 1<< (cfip->DevSize - 20));
 390         printk("Flash Device Interface description: 0x%4.4X\n", cfip->InterfaceDesc);
 391         switch(cfip->InterfaceDesc) {
 392         case CFI_INTERFACE_X8_ASYNC:
 393                 printk("  - x8-only asynchronous interface\n");
 394                 break;
 395
 396         case CFI_INTERFACE_X16_ASYNC:
 397                 printk("  - x16-only asynchronous interface\n");
 398                 break;
 399
 400         case CFI_INTERFACE_X8_BY_X16_ASYNC:
 401                 printk("  - supports x8 and x16 via BYTE# with asynchronous interface\n");
 402                 break;
 403
 404         case CFI_INTERFACE_X32_ASYNC:
 405                 printk("  - x32-only asynchronous interface\n");
 406                 break;
 407
 408         case CFI_INTERFACE_X16_BY_X32_ASYNC:
 409                 printk("  - supports x16 and x32 via Word# with asynchronous interface\n");
 410                 break;
 411
 412         case CFI_INTERFACE_NOT_ALLOWED:
 413                 printk("  - Not Allowed / Reserved\n");
 414                 break;
 415
 416         default:
 417                 printk("  - Unknown\n");
 418                 break;
 419         }
 420
 421         printk("Max. bytes in buffer write: 0x%x\n", 1<< cfip->MaxBufWriteSize);
 422         printk("Number of Erase Block Regions: %d\n", cfip->NumEraseRegions);
 423
 424 }
 425 #endif /* DEBUG_CFI */
 426
 427 static struct chip_probe cfi_chip_probe = {
 428         .name           = "CFI",
 429         .probe_chip     = cfi_probe_chip
 430 };
 431
 432 struct mtd_info *cfi_probe(struct map_info *map)
 433 {
 434         /*
 435          * Just use the generic probe stuff to call our CFI-specific
 436          * chip_probe routine in all the possible permutations, etc.
 437          */
 438         return mtd_do_chip_probe(map, &cfi_chip_probe);
 439 }
 440
 441 static struct mtd_chip_driver cfi_chipdrv = {
 442         .probe          = cfi_probe,
 443         .name           = "cfi_probe",
 444         .module         = THIS_MODULE
 445 };
 446
 447 static int __init cfi_probe_init(void)
 448 {
 449         register_mtd_chip_driver(&cfi_chipdrv);
 450         return 0;
 451 }
 452
 453 static void __exit cfi_probe_exit(void)
 454 {
 455         unregister_mtd_chip_driver(&cfi_chipdrv);
 456 }
 457
 458 module_init(cfi_probe_init);
 459 module_exit(cfi_probe_exit);
 460
 461 MODULE_LICENSE("GPL");
 462 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org> et al.");
 463 MODULE_DESCRIPTION("Probe code for CFI-compliant flash chips");