drivers/mtd/st_smi.c

   1 /*
   2  * (C) Copyright 2009
   3  * Vipin Kumar, ST Microelectronics, vipin.kumar@st.com.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <flash.h>
  10 #include <linux/err.h>
  11 #include <linux/mtd/st_smi.h>
  12
  13 #include <asm/io.h>
  14 #include <asm/arch/hardware.h>
  15
  16 #if !defined(CONFIG_SYS_NO_FLASH)
  17
  18 static struct smi_regs *const smicntl =
  19     (struct smi_regs * const)CONFIG_SYS_SMI_BASE;
  20 static ulong bank_base[CONFIG_SYS_MAX_FLASH_BANKS] =
  21     CONFIG_SYS_FLASH_ADDR_BASE;
  22 flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];
  23
  24 /* data structure to maintain flash ids from different vendors */
  25 struct flash_device {
  26         char *name;
  27         u8 erase_cmd;
  28         u32 device_id;
  29         u32 pagesize;
  30         unsigned long sectorsize;
  31         unsigned long size_in_bytes;
  32 };
  33
  34 #define FLASH_ID(n, es, id, psize, ssize, size) \
  35 {                               \
  36         .name = n,              \
  37         .erase_cmd = es,        \
  38         .device_id = id,        \
  39         .pagesize = psize,      \
  40         .sectorsize = ssize,    \
  41         .size_in_bytes = size   \
  42 }
  43
  44 /*
  45  * List of supported flash devices.
  46  * Currently the erase_cmd field is not used in this driver.
  47  */
  48 static struct flash_device flash_devices[] = {
  49         FLASH_ID("st m25p16"     , 0xd8, 0x00152020, 0x100, 0x10000, 0x200000),
  50         FLASH_ID("st m25p32"     , 0xd8, 0x00162020, 0x100, 0x10000, 0x400000),
  51         FLASH_ID("st m25p64"     , 0xd8, 0x00172020, 0x100, 0x10000, 0x800000),
  52         FLASH_ID("st m25p128"    , 0xd8, 0x00182020, 0x100, 0x40000, 0x1000000),
  53         FLASH_ID("st m25p05"     , 0xd8, 0x00102020, 0x80 , 0x8000 , 0x10000),
  54         FLASH_ID("st m25p10"     , 0xd8, 0x00112020, 0x80 , 0x8000 , 0x20000),
  55         FLASH_ID("st m25p20"     , 0xd8, 0x00122020, 0x100, 0x10000, 0x40000),
  56         FLASH_ID("st m25p40"     , 0xd8, 0x00132020, 0x100, 0x10000, 0x80000),
  57         FLASH_ID("st m25p80"     , 0xd8, 0x00142020, 0x100, 0x10000, 0x100000),
  58         FLASH_ID("st m45pe10"    , 0xd8, 0x00114020, 0x100, 0x10000, 0x20000),
  59         FLASH_ID("st m45pe20"    , 0xd8, 0x00124020, 0x100, 0x10000, 0x40000),
  60         FLASH_ID("st m45pe40"    , 0xd8, 0x00134020, 0x100, 0x10000, 0x80000),
  61         FLASH_ID("st m45pe80"    , 0xd8, 0x00144020, 0x100, 0x10000, 0x100000),
  62         FLASH_ID("sp s25fl004"   , 0xd8, 0x00120201, 0x100, 0x10000, 0x80000),
  63         FLASH_ID("sp s25fl008"   , 0xd8, 0x00130201, 0x100, 0x10000, 0x100000),
  64         FLASH_ID("sp s25fl016"   , 0xd8, 0x00140201, 0x100, 0x10000, 0x200000),
  65         FLASH_ID("sp s25fl032"   , 0xd8, 0x00150201, 0x100, 0x10000, 0x400000),
  66         FLASH_ID("sp s25fl064"   , 0xd8, 0x00160201, 0x100, 0x10000, 0x800000),
  67         FLASH_ID("mac 25l512"    , 0xd8, 0x001020C2, 0x010, 0x10000, 0x10000),
  68         FLASH_ID("mac 25l1005"   , 0xd8, 0x001120C2, 0x010, 0x10000, 0x20000),
  69         FLASH_ID("mac 25l2005"   , 0xd8, 0x001220C2, 0x010, 0x10000, 0x40000),
  70         FLASH_ID("mac 25l4005"   , 0xd8, 0x001320C2, 0x010, 0x10000, 0x80000),
  71         FLASH_ID("mac 25l4005a"  , 0xd8, 0x001320C2, 0x010, 0x10000, 0x80000),
  72         FLASH_ID("mac 25l8005"   , 0xd8, 0x001420C2, 0x010, 0x10000, 0x100000),
  73         FLASH_ID("mac 25l1605"   , 0xd8, 0x001520C2, 0x100, 0x10000, 0x200000),
  74         FLASH_ID("mac 25l1605a"  , 0xd8, 0x001520C2, 0x010, 0x10000, 0x200000),
  75         FLASH_ID("mac 25l3205"   , 0xd8, 0x001620C2, 0x100, 0x10000, 0x400000),
  76         FLASH_ID("mac 25l3205a"  , 0xd8, 0x001620C2, 0x100, 0x10000, 0x400000),
  77         FLASH_ID("mac 25l6405"   , 0xd8, 0x001720C2, 0x100, 0x10000, 0x800000),
  78         FLASH_ID("wbd w25q128" , 0xd8, 0x001840EF, 0x100, 0x10000, 0x1000000),
  79 };
  80
  81 /*
  82  * smi_wait_xfer_finish - Wait until TFF is set in status register
  83  * @timeout:     timeout in milliseconds
  84  *
  85  * Wait until TFF is set in status register
  86  */
  87 static int smi_wait_xfer_finish(int timeout)
  88 {
  89         ulong start = get_timer(0);
  90
  91         while (get_timer(start) < timeout) {
  92                 if (readl(&smicntl->smi_sr) & TFF)
  93                         return 0;
  94
  95                 /* Try after 10 ms */
  96                 udelay(10);
  97         };
  98
  99         return -1;
 100 }
 101
 102 /*
 103  * smi_read_id - Read flash id
 104  * @info:        flash_info structure pointer
 105  * @banknum:     bank number
 106  *
 107  * Read the flash id present at bank #banknum
 108  */
 109 static unsigned int smi_read_id(flash_info_t *info, int banknum)
 110 {
 111         unsigned int value;
 112
 113         writel(readl(&smicntl->smi_cr1) | SW_MODE, &smicntl->smi_cr1);
 114         writel(READ_ID, &smicntl->smi_tr);
 115         writel((banknum << BANKSEL_SHIFT) | SEND | TX_LEN_1 | RX_LEN_3,
 116                &smicntl->smi_cr2);
 117
 118         if (smi_wait_xfer_finish(XFER_FINISH_TOUT))
 119                 return -EIO;
 120
 121         value = (readl(&smicntl->smi_rr) & 0x00FFFFFF);
 122
 123         writel(readl(&smicntl->smi_sr) & ~TFF, &smicntl->smi_sr);
 124         writel(readl(&smicntl->smi_cr1) & ~SW_MODE, &smicntl->smi_cr1);
 125
 126         return value;
 127 }
 128
 129 /*
 130  * flash_get_size - Detect the SMI flash by reading the ID.
 131  * @base:        Base address of the flash area bank #banknum
 132  * @banknum:     Bank number
 133  *
 134  * Detect the SMI flash by reading the ID. Initializes the flash_info structure
 135  * with size, sector count etc.
 136  */
 137 static ulong flash_get_size(ulong base, int banknum)
 138 {
 139         flash_info_t *info = &flash_info[banknum];
 140         int value;
 141         int i;
 142
 143         value = smi_read_id(info, banknum);
 144
 145         if (value < 0) {
 146                 printf("Flash id could not be read\n");
 147                 return 0;
 148         }
 149
 150         /* Matches chip-id to entire list of 'serial-nor flash' ids */
 151         for (i = 0; i < ARRAY_SIZE(flash_devices); i++) {
 152                 if (flash_devices[i].device_id == value) {
 153                         info->size = flash_devices[i].size_in_bytes;
 154                         info->flash_id = value;
 155                         info->start[0] = base;
 156                         info->sector_count =
 157                                         info->size/flash_devices[i].sectorsize;
 158
 159                         return info->size;
 160                 }
 161         }
 162
 163         return 0;
 164 }
 165
 166 /*
 167  * smi_read_sr - Read status register of SMI
 168  * @bank:        bank number
 169  *
 170  * This routine will get the status register of the flash chip present at the
 171  * given bank
 172  */
 173 static int smi_read_sr(int bank)
 174 {
 175         u32 ctrlreg1, val;
 176
 177         /* store the CTRL REG1 state */
 178         ctrlreg1 = readl(&smicntl->smi_cr1);
 179
 180         /* Program SMI in HW Mode */
 181         writel(readl(&smicntl->smi_cr1) & ~(SW_MODE | WB_MODE),
 182                &smicntl->smi_cr1);
 183
 184         /* Performing a RSR instruction in HW mode */
 185         writel((bank << BANKSEL_SHIFT) | RD_STATUS_REG, &smicntl->smi_cr2);
 186
 187         if (smi_wait_xfer_finish(XFER_FINISH_TOUT))
 188                 return -1;
 189
 190         val = readl(&smicntl->smi_sr);
 191
 192         /* Restore the CTRL REG1 state */
 193         writel(ctrlreg1, &smicntl->smi_cr1);
 194
 195         return val;
 196 }
 197
 198 /*
 199  * smi_wait_till_ready - Wait till last operation is over.
 200  * @bank:        bank number shifted.
 201  * @timeout:     timeout in milliseconds.
 202  *
 203  * This routine checks for WIP(write in progress)bit in Status register(SMSR-b0)
 204  * The routine checks for #timeout loops, each at interval of 1 milli-second.
 205  * If successful the routine returns 0.
 206  */
 207 static int smi_wait_till_ready(int bank, int timeout)
 208 {
 209         int sr;
 210         ulong start = get_timer(0);
 211
 212         /* One chip guarantees max 5 msec wait here after page writes,
 213            but potentially three seconds (!) after page erase. */
 214         while (get_timer(start) < timeout) {
 215                 sr = smi_read_sr(bank);
 216                 if ((sr >= 0) && (!(sr & WIP_BIT)))
 217                         return 0;
 218
 219                 /* Try again after 10 usec */
 220                 udelay(10);
 221         } while (timeout--);
 222
 223         printf("SMI controller is still in wait, timeout=%d\n", timeout);
 224         return -EIO;
 225 }
 226
 227 /*
 228  * smi_write_enable - Enable the flash to do write operation
 229  * @bank:        bank number
 230  *
 231  * Set write enable latch with Write Enable command.
 232  * Returns negative if error occurred.
 233  */
 234 static int smi_write_enable(int bank)
 235 {
 236         u32 ctrlreg1;
 237         u32 start;
 238         int timeout = WMODE_TOUT;
 239         int sr;
 240
 241         /* Store the CTRL REG1 state */
 242         ctrlreg1 = readl(&smicntl->smi_cr1);
 243
 244         /* Program SMI in H/W Mode */
 245         writel(readl(&smicntl->smi_cr1) & ~SW_MODE, &smicntl->smi_cr1);
 246
 247         /* Give the Flash, Write Enable command */
 248         writel((bank << BANKSEL_SHIFT) | WE, &smicntl->smi_cr2);
 249
 250         if (smi_wait_xfer_finish(XFER_FINISH_TOUT))
 251                 return -1;
 252
 253         /* Restore the CTRL REG1 state */
 254         writel(ctrlreg1, &smicntl->smi_cr1);
 255
 256         start = get_timer(0);
 257         while (get_timer(start) < timeout) {
 258                 sr = smi_read_sr(bank);
 259                 if ((sr >= 0) && (sr & (1 << (bank + WM_SHIFT))))
 260                         return 0;
 261
 262                 /* Try again after 10 usec */
 263                 udelay(10);
 264         };
 265
 266         return -1;
 267 }
 268
 269 /*
 270  * smi_init - SMI initialization routine
 271  *
 272  * SMI initialization routine. Sets SMI control register1.
 273  */
 274 void smi_init(void)
 275 {
 276         /* Setting the fast mode values. SMI working at 166/4 = 41.5 MHz */
 277         writel(HOLD1 | FAST_MODE | BANK_EN | DSEL_TIME | PRESCAL4,
 278                &smicntl->smi_cr1);
 279 }
 280
 281 /*
 282  * smi_sector_erase - Erase flash sector
 283  * @info:        flash_info structure pointer
 284  * @sector:      sector number
 285  *
 286  * Set write enable latch with Write Enable command.
 287  * Returns negative if error occurred.
 288  */
 289 static int smi_sector_erase(flash_info_t *info, unsigned int sector)
 290 {
 291         int bank;
 292         unsigned int sect_add;
 293         unsigned int instruction;
 294
 295         switch (info->start[0]) {
 296         case SMIBANK0_BASE:
 297                 bank = BANK0;
 298                 break;
 299         case SMIBANK1_BASE:
 300                 bank = BANK1;
 301                 break;
 302         case SMIBANK2_BASE:
 303                 bank = BANK2;
 304                 break;
 305         case SMIBANK3_BASE:
 306                 bank = BANK3;
 307                 break;
 308         default:
 309                 return -1;
 310         }
 311
 312         sect_add = sector * (info->size / info->sector_count);
 313         instruction = ((sect_add >> 8) & 0x0000FF00) | SECTOR_ERASE;
 314
 315         writel(readl(&smicntl->smi_sr) & ~(ERF1 | ERF2), &smicntl->smi_sr);
 316
 317         /* Wait until finished previous write command. */
 318         if (smi_wait_till_ready(bank, CONFIG_SYS_FLASH_ERASE_TOUT))
 319                 return -EBUSY;
 320
 321         /* Send write enable, before erase commands. */
 322         if (smi_write_enable(bank))
 323                 return -EIO;
 324
 325         /* Put SMI in SW mode */
 326         writel(readl(&smicntl->smi_cr1) | SW_MODE, &smicntl->smi_cr1);
 327
 328         /* Send Sector Erase command in SW Mode */
 329         writel(instruction, &smicntl->smi_tr);
 330         writel((bank << BANKSEL_SHIFT) | SEND | TX_LEN_4,
 331                        &smicntl->smi_cr2);
 332         if (smi_wait_xfer_finish(XFER_FINISH_TOUT))
 333                 return -EIO;
 334
 335         if (smi_wait_till_ready(bank, CONFIG_SYS_FLASH_ERASE_TOUT))
 336                 return -EBUSY;
 337
 338         /* Put SMI in HW mode */
 339         writel(readl(&smicntl->smi_cr1) & ~SW_MODE,
 340                        &smicntl->smi_cr1);
 341
 342         return 0;
 343 }
 344
 345 /*
 346  * smi_write - Write to SMI flash
 347  * @src_addr:    source buffer
 348  * @dst_addr:    destination buffer
 349  * @length:      length to write in bytes
 350  * @bank:        bank base address
 351  *
 352  * Write to SMI flash
 353  */
 354 static int smi_write(unsigned int *src_addr, unsigned int *dst_addr,
 355                      unsigned int length, ulong bank_addr)
 356 {
 357         u8 *src_addr8 = (u8 *)src_addr;
 358         u8 *dst_addr8 = (u8 *)dst_addr;
 359         int banknum;
 360         int i;
 361
 362         switch (bank_addr) {
 363         case SMIBANK0_BASE:
 364                 banknum = BANK0;
 365                 break;
 366         case SMIBANK1_BASE:
 367                 banknum = BANK1;
 368                 break;
 369         case SMIBANK2_BASE:
 370                 banknum = BANK2;
 371                 break;
 372         case SMIBANK3_BASE:
 373                 banknum = BANK3;
 374                 break;
 375         default:
 376                 return -1;
 377         }
 378
 379         if (smi_wait_till_ready(banknum, CONFIG_SYS_FLASH_WRITE_TOUT))
 380                 return -EBUSY;
 381
 382         /* Set SMI in Hardware Mode */
 383         writel(readl(&smicntl->smi_cr1) & ~SW_MODE, &smicntl->smi_cr1);
 384
 385         if (smi_write_enable(banknum))
 386                 return -EIO;
 387
 388         /* Perform the write command */
 389         for (i = 0; i < length; i += 4) {
 390                 if (((ulong) (dst_addr) % SFLASH_PAGE_SIZE) == 0) {
 391                         if (smi_wait_till_ready(banknum,
 392                                                 CONFIG_SYS_FLASH_WRITE_TOUT))
 393                                 return -EBUSY;
 394
 395                         if (smi_write_enable(banknum))
 396                                 return -EIO;
 397                 }
 398
 399                 if (length < 4) {
 400                         int k;
 401
 402                         /*
 403                          * Handle special case, where length < 4 (redundant env)
 404                          */
 405                         for (k = 0; k < length; k++)
 406                                 *dst_addr8++ = *src_addr8++;
 407                 } else {
 408                         /* Normal 32bit write */
 409                         *dst_addr++ = *src_addr++;
 410                 }
 411
 412                 if ((readl(&smicntl->smi_sr) & (ERF1 | ERF2)))
 413                         return -EIO;
 414         }
 415
 416         if (smi_wait_till_ready(banknum, CONFIG_SYS_FLASH_WRITE_TOUT))
 417                 return -EBUSY;
 418
 419         writel(readl(&smicntl->smi_sr) & ~(WCF), &smicntl->smi_sr);
 420
 421         return 0;
 422 }
 423
 424 /*
 425  * write_buff - Write to SMI flash
 426  * @info:        flash info structure
 427  * @src:         source buffer
 428  * @dest_addr:   destination buffer
 429  * @length:      length to write in words
 430  *
 431  * Write to SMI flash
 432  */
 433 int write_buff(flash_info_t *info, uchar *src, ulong dest_addr, ulong length)
 434 {
 435         return smi_write((unsigned int *)src, (unsigned int *)dest_addr,
 436                          length, info->start[0]);
 437 }
 438
 439 /*
 440  * flash_init - SMI flash initialization
 441  *
 442  * SMI flash initialization
 443  */
 444 unsigned long flash_init(void)
 445 {
 446         unsigned long size = 0;
 447         int i, j;
 448
 449         smi_init();
 450
 451         for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
 452                 flash_info[i].flash_id = FLASH_UNKNOWN;
 453                 size += flash_info[i].size = flash_get_size(bank_base[i], i);
 454         }
 455
 456         for (j = 0; j < CONFIG_SYS_MAX_FLASH_BANKS; j++) {
 457                 for (i = 1; i < flash_info[j].sector_count; i++)
 458                         flash_info[j].start[i] =
 459                             flash_info[j].start[i - 1] +
 460                             flash_info->size / flash_info->sector_count;
 461
 462         }
 463
 464         return size;
 465 }
 466
 467 /*
 468  * flash_print_info - Print SMI flash information
 469  *
 470  * Print SMI flash information
 471  */
 472 void flash_print_info(flash_info_t *info)
 473 {
 474         int i;
 475         if (info->flash_id == FLASH_UNKNOWN) {
 476                 puts("missing or unknown FLASH type\n");
 477                 return;
 478         }
 479
 480         if (info->size >= 0x100000)
 481                 printf("  Size: %ld MB in %d Sectors\n",
 482                        info->size >> 20, info->sector_count);
 483         else
 484                 printf("  Size: %ld KB in %d Sectors\n",
 485                        info->size >> 10, info->sector_count);
 486
 487         puts("  Sector Start Addresses:");
 488         for (i = 0; i < info->sector_count; ++i) {
 489 #ifdef CONFIG_SYS_FLASH_EMPTY_INFO
 490                 int size;
 491                 int erased;
 492                 u32 *flash;
 493
 494                 /*
 495                  * Check if whole sector is erased
 496                  */
 497                 size = (info->size) / (info->sector_count);
 498                 flash = (u32 *) info->start[i];
 499                 size = size / sizeof(int);
 500
 501                 while ((size--) && (*flash++ == ~0))
 502                         ;
 503
 504                 size++;
 505                 if (size)
 506                         erased = 0;
 507                 else
 508                         erased = 1;
 509
 510                 if ((i % 5) == 0)
 511                         printf("\n");
 512
 513                 printf(" %08lX%s%s",
 514                        info->start[i],
 515                        erased ? " E" : "  ", info->protect[i] ? "RO " : "   ");
 516 #else
 517                 if ((i % 5) == 0)
 518                         printf("\n   ");
 519                 printf(" %08lX%s",
 520                        info->start[i], info->protect[i] ? " (RO)  " : "     ");
 521 #endif
 522         }
 523         putc('\n');
 524         return;
 525 }
 526
 527 /*
 528  * flash_erase - Erase SMI flash
 529  *
 530  * Erase SMI flash
 531  */
 532 int flash_erase(flash_info_t *info, int s_first, int s_last)
 533 {
 534         int rcode = 0;
 535         int prot = 0;
 536         flash_sect_t sect;
 537
 538         if ((s_first < 0) || (s_first > s_last)) {
 539                 puts("- no sectors to erase\n");
 540                 return 1;
 541         }
 542
 543         for (sect = s_first; sect <= s_last; ++sect) {
 544                 if (info->protect[sect])
 545                         prot++;
 546         }
 547         if (prot) {
 548                 printf("- Warning: %d protected sectors will not be erased!\n",
 549                        prot);
 550         } else {
 551                 putc('\n');
 552         }
 553
 554         for (sect = s_first; sect <= s_last; sect++) {
 555                 if (info->protect[sect] == 0) {
 556                         if (smi_sector_erase(info, sect))
 557                                 rcode = 1;
 558                         else
 559                                 putc('.');
 560                 }
 561         }
 562         puts(" done\n");
 563         return rcode;
 564 }
 565 #endif