1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Based on m25p80.c, by Mike Lavender (mike@steroidmicros.com), with 4 * influence from lart.c (Abraham Van Der Merwe) and mtd_dataflash.c 5 * 6 * Copyright (C) 2005, Intec Automation Inc. 7 * Copyright (C) 2014, Freescale Semiconductor, Inc. 8 * 9 * Synced from Linux v4.19 10 */ 11 12 #include <common.h> 13 #include <linux/err.h> 14 #include <linux/errno.h> 15 #include <linux/log2.h> 16 #include <linux/math64.h> 17 #include <linux/sizes.h> 18 19 #include <linux/mtd/mtd.h> 20 #include <linux/mtd/spi-nor.h> 21 #include <spi-mem.h> 22 #include <spi.h> 23 24 #include "sf_internal.h" 25 26 /* Define max times to check status register before we give up. */ 27 28 /* 29 * For everything but full-chip erase; probably could be much smaller, but kept 30 * around for safety for now 31 */ 32 33 #define HZ CONFIG_SYS_HZ 34 35 #define DEFAULT_READY_WAIT_JIFFIES (40UL * HZ) 36 37 static int spi_nor_read_write_reg(struct spi_nor *nor, struct spi_mem_op 38 *op, void *buf) 39 { 40 if (op->data.dir == SPI_MEM_DATA_IN) 41 op->data.buf.in = buf; 42 else 43 op->data.buf.out = buf; 44 return spi_mem_exec_op(nor->spi, op); 45 } 46 47 static int spi_nor_read_reg(struct spi_nor *nor, u8 code, u8 *val, int len) 48 { 49 struct spi_mem_op op = SPI_MEM_OP(SPI_MEM_OP_CMD(code, 1), 50 SPI_MEM_OP_NO_ADDR, 51 SPI_MEM_OP_NO_DUMMY, 52 SPI_MEM_OP_DATA_IN(len, NULL, 1)); 53 int ret; 54 55 ret = spi_nor_read_write_reg(nor, &op, val); 56 if (ret < 0) 57 dev_dbg(&flash->spimem->spi->dev, "error %d reading %x\n", ret, 58 code); 59 60 return ret; 61 } 62 63 static int spi_nor_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len) 64 { 65 struct spi_mem_op op = SPI_MEM_OP(SPI_MEM_OP_CMD(opcode, 1), 66 SPI_MEM_OP_NO_ADDR, 67 SPI_MEM_OP_NO_DUMMY, 68 SPI_MEM_OP_DATA_OUT(len, NULL, 1)); 69 70 return spi_nor_read_write_reg(nor, &op, buf); 71 } 72 73 static ssize_t spi_nor_read_data(struct spi_nor *nor, loff_t from, size_t len, 74 u_char *buf) 75 { 76 struct spi_mem_op op = 77 SPI_MEM_OP(SPI_MEM_OP_CMD(nor->read_opcode, 1), 78 SPI_MEM_OP_ADDR(nor->addr_width, from, 1), 79 SPI_MEM_OP_DUMMY(nor->read_dummy, 1), 80 SPI_MEM_OP_DATA_IN(len, buf, 1)); 81 size_t remaining = len; 82 int ret; 83 84 /* get transfer protocols. */ 85 op.cmd.buswidth = spi_nor_get_protocol_inst_nbits(nor->read_proto); 86 op.addr.buswidth = spi_nor_get_protocol_addr_nbits(nor->read_proto); 87 op.dummy.buswidth = op.addr.buswidth; 88 op.data.buswidth = spi_nor_get_protocol_data_nbits(nor->read_proto); 89 90 /* convert the dummy cycles to the number of bytes */ 91 op.dummy.nbytes = (nor->read_dummy * op.dummy.buswidth) / 8; 92 93 while (remaining) { 94 op.data.nbytes = remaining < UINT_MAX ? remaining : UINT_MAX; 95 ret = spi_mem_adjust_op_size(nor->spi, &op); 96 if (ret) 97 return ret; 98 99 ret = spi_mem_exec_op(nor->spi, &op); 100 if (ret) 101 return ret; 102 103 op.addr.val += op.data.nbytes; 104 remaining -= op.data.nbytes; 105 op.data.buf.in += op.data.nbytes; 106 } 107 108 return len; 109 } 110 111 static ssize_t spi_nor_write_data(struct spi_nor *nor, loff_t to, size_t len, 112 const u_char *buf) 113 { 114 struct spi_mem_op op = 115 SPI_MEM_OP(SPI_MEM_OP_CMD(nor->program_opcode, 1), 116 SPI_MEM_OP_ADDR(nor->addr_width, to, 1), 117 SPI_MEM_OP_NO_DUMMY, 118 SPI_MEM_OP_DATA_OUT(len, buf, 1)); 119 int ret; 120 121 /* get transfer protocols. */ 122 op.cmd.buswidth = spi_nor_get_protocol_inst_nbits(nor->write_proto); 123 op.addr.buswidth = spi_nor_get_protocol_addr_nbits(nor->write_proto); 124 op.data.buswidth = spi_nor_get_protocol_data_nbits(nor->write_proto); 125 126 if (nor->program_opcode == SPINOR_OP_AAI_WP && nor->sst_write_second) 127 op.addr.nbytes = 0; 128 129 ret = spi_mem_adjust_op_size(nor->spi, &op); 130 if (ret) 131 return ret; 132 op.data.nbytes = len < op.data.nbytes ? len : op.data.nbytes; 133 134 ret = spi_mem_exec_op(nor->spi, &op); 135 if (ret) 136 return ret; 137 138 return op.data.nbytes; 139 } 140 141 /* 142 * Read the status register, returning its value in the location 143 * Return the status register value. 144 * Returns negative if error occurred. 145 */ 146 static int read_sr(struct spi_nor *nor) 147 { 148 int ret; 149 u8 val; 150 151 ret = nor->read_reg(nor, SPINOR_OP_RDSR, &val, 1); 152 if (ret < 0) { 153 pr_debug("error %d reading SR\n", (int)ret); 154 return ret; 155 } 156 157 return val; 158 } 159 160 /* 161 * Read the flag status register, returning its value in the location 162 * Return the status register value. 163 * Returns negative if error occurred. 164 */ 165 static int read_fsr(struct spi_nor *nor) 166 { 167 int ret; 168 u8 val; 169 170 ret = nor->read_reg(nor, SPINOR_OP_RDFSR, &val, 1); 171 if (ret < 0) { 172 pr_debug("error %d reading FSR\n", ret); 173 return ret; 174 } 175 176 return val; 177 } 178 179 /* 180 * Read configuration register, returning its value in the 181 * location. Return the configuration register value. 182 * Returns negative if error occurred. 183 */ 184 #if defined(CONFIG_SPI_FLASH_SPANSION) || defined(CONFIG_SPI_FLASH_WINBOND) || defined(CONFIG_SPI_FLASH_NORMEM) 185 static int read_cr(struct spi_nor *nor) 186 { 187 int ret; 188 u8 val; 189 190 ret = nor->read_reg(nor, SPINOR_OP_RDCR, &val, 1); 191 if (ret < 0) { 192 dev_dbg(nor->dev, "error %d reading CR\n", ret); 193 return ret; 194 } 195 196 return val; 197 } 198 #endif 199 200 /* 201 * Write status register 1 byte 202 * Returns negative if error occurred. 203 */ 204 static int write_sr(struct spi_nor *nor, u8 val) 205 { 206 nor->cmd_buf[0] = val; 207 return nor->write_reg(nor, SPINOR_OP_WRSR, nor->cmd_buf, 1); 208 } 209 210 #ifdef CONFIG_SPI_FLASH_NORMEM 211 /* 212 * Write confiture register 1 byte 213 * Returns negative if error occurred. 214 */ 215 static int write_cr(struct spi_nor *nor, u8 val) 216 { 217 nor->cmd_buf[0] = val; 218 return nor->write_reg(nor, SPINOR_OP_WRCR, nor->cmd_buf, 1); 219 } 220 #endif 221 222 /* 223 * Set write enable latch with Write Enable command. 224 * Returns negative if error occurred. 225 */ 226 static int write_enable(struct spi_nor *nor) 227 { 228 return nor->write_reg(nor, SPINOR_OP_WREN, NULL, 0); 229 } 230 231 /* 232 * Send write disable instruction to the chip. 233 */ 234 static int write_disable(struct spi_nor *nor) 235 { 236 return nor->write_reg(nor, SPINOR_OP_WRDI, NULL, 0); 237 } 238 239 static struct spi_nor *mtd_to_spi_nor(struct mtd_info *mtd) 240 { 241 return mtd->priv; 242 } 243 244 #ifndef CONFIG_SPI_FLASH_BAR 245 static u8 spi_nor_convert_opcode(u8 opcode, const u8 table[][2], size_t size) 246 { 247 size_t i; 248 249 for (i = 0; i < size; i++) 250 if (table[i][0] == opcode) 251 return table[i][1]; 252 253 /* No conversion found, keep input op code. */ 254 return opcode; 255 } 256 257 static u8 spi_nor_convert_3to4_read(u8 opcode) 258 { 259 static const u8 spi_nor_3to4_read[][2] = { 260 { SPINOR_OP_READ, SPINOR_OP_READ_4B }, 261 { SPINOR_OP_READ_FAST, SPINOR_OP_READ_FAST_4B }, 262 { SPINOR_OP_READ_1_1_2, SPINOR_OP_READ_1_1_2_4B }, 263 { SPINOR_OP_READ_1_2_2, SPINOR_OP_READ_1_2_2_4B }, 264 { SPINOR_OP_READ_1_1_4, SPINOR_OP_READ_1_1_4_4B }, 265 { SPINOR_OP_READ_1_4_4, SPINOR_OP_READ_1_4_4_4B }, 266 { SPINOR_OP_READ_1_1_8, SPINOR_OP_READ_1_1_8_4B }, 267 { SPINOR_OP_READ_1_8_8, SPINOR_OP_READ_1_8_8_4B }, 268 269 { SPINOR_OP_READ_1_1_1_DTR, SPINOR_OP_READ_1_1_1_DTR_4B }, 270 { SPINOR_OP_READ_1_2_2_DTR, SPINOR_OP_READ_1_2_2_DTR_4B }, 271 { SPINOR_OP_READ_1_4_4_DTR, SPINOR_OP_READ_1_4_4_DTR_4B }, 272 }; 273 274 return spi_nor_convert_opcode(opcode, spi_nor_3to4_read, 275 ARRAY_SIZE(spi_nor_3to4_read)); 276 } 277 278 static u8 spi_nor_convert_3to4_program(u8 opcode) 279 { 280 static const u8 spi_nor_3to4_program[][2] = { 281 { SPINOR_OP_PP, SPINOR_OP_PP_4B }, 282 { SPINOR_OP_PP_1_1_4, SPINOR_OP_PP_1_1_4_4B }, 283 { SPINOR_OP_PP_1_4_4, SPINOR_OP_PP_1_4_4_4B }, 284 { SPINOR_OP_PP_1_1_8, SPINOR_OP_PP_1_1_8_4B }, 285 { SPINOR_OP_PP_1_8_8, SPINOR_OP_PP_1_8_8_4B }, 286 }; 287 288 return spi_nor_convert_opcode(opcode, spi_nor_3to4_program, 289 ARRAY_SIZE(spi_nor_3to4_program)); 290 } 291 292 static u8 spi_nor_convert_3to4_erase(u8 opcode) 293 { 294 static const u8 spi_nor_3to4_erase[][2] = { 295 { SPINOR_OP_BE_4K, SPINOR_OP_BE_4K_4B }, 296 { SPINOR_OP_BE_32K, SPINOR_OP_BE_32K_4B }, 297 { SPINOR_OP_SE, SPINOR_OP_SE_4B }, 298 }; 299 300 return spi_nor_convert_opcode(opcode, spi_nor_3to4_erase, 301 ARRAY_SIZE(spi_nor_3to4_erase)); 302 } 303 304 static void spi_nor_set_4byte_opcodes(struct spi_nor *nor, 305 const struct flash_info *info) 306 { 307 /* Do some manufacturer fixups first */ 308 switch (JEDEC_MFR(info)) { 309 case SNOR_MFR_SPANSION: 310 /* No small sector erase for 4-byte command set */ 311 nor->erase_opcode = SPINOR_OP_SE; 312 nor->mtd.erasesize = info->sector_size; 313 break; 314 315 default: 316 break; 317 } 318 319 nor->read_opcode = spi_nor_convert_3to4_read(nor->read_opcode); 320 nor->program_opcode = spi_nor_convert_3to4_program(nor->program_opcode); 321 nor->erase_opcode = spi_nor_convert_3to4_erase(nor->erase_opcode); 322 } 323 #endif /* !CONFIG_SPI_FLASH_BAR */ 324 325 /* Enable/disable 4-byte addressing mode. */ 326 static int set_4byte(struct spi_nor *nor, const struct flash_info *info, 327 int enable) 328 { 329 int status; 330 bool need_wren = false; 331 u8 cmd; 332 333 switch (JEDEC_MFR(info)) { 334 case SNOR_MFR_ST: 335 case SNOR_MFR_MICRON: 336 /* Some Micron need WREN command; all will accept it */ 337 need_wren = true; 338 case SNOR_MFR_MACRONIX: 339 case SNOR_MFR_WINBOND: 340 if (need_wren) 341 write_enable(nor); 342 343 cmd = enable ? SPINOR_OP_EN4B : SPINOR_OP_EX4B; 344 status = nor->write_reg(nor, cmd, NULL, 0); 345 if (need_wren) 346 write_disable(nor); 347 348 if (!status && !enable && 349 JEDEC_MFR(info) == SNOR_MFR_WINBOND) { 350 /* 351 * On Winbond W25Q256FV, leaving 4byte mode causes 352 * the Extended Address Register to be set to 1, so all 353 * 3-byte-address reads come from the second 16M. 354 * We must clear the register to enable normal behavior. 355 */ 356 write_enable(nor); 357 nor->cmd_buf[0] = 0; 358 nor->write_reg(nor, SPINOR_OP_WREAR, nor->cmd_buf, 1); 359 write_disable(nor); 360 } 361 362 return status; 363 default: 364 /* Spansion style */ 365 nor->cmd_buf[0] = enable << 7; 366 return nor->write_reg(nor, SPINOR_OP_BRWR, nor->cmd_buf, 1); 367 } 368 } 369 370 static int spi_nor_sr_ready(struct spi_nor *nor) 371 { 372 int sr = read_sr(nor); 373 374 if (sr < 0) 375 return sr; 376 377 if (nor->flags & SNOR_F_USE_CLSR && sr & (SR_E_ERR | SR_P_ERR)) { 378 if (sr & SR_E_ERR) 379 dev_dbg(nor->dev, "Erase Error occurred\n"); 380 else 381 dev_dbg(nor->dev, "Programming Error occurred\n"); 382 383 nor->write_reg(nor, SPINOR_OP_CLSR, NULL, 0); 384 return -EIO; 385 } 386 387 return !(sr & SR_WIP); 388 } 389 390 static int spi_nor_fsr_ready(struct spi_nor *nor) 391 { 392 int fsr = read_fsr(nor); 393 394 if (fsr < 0) 395 return fsr; 396 397 if (fsr & (FSR_E_ERR | FSR_P_ERR)) { 398 if (fsr & FSR_E_ERR) 399 dev_err(nor->dev, "Erase operation failed.\n"); 400 else 401 dev_err(nor->dev, "Program operation failed.\n"); 402 403 if (fsr & FSR_PT_ERR) 404 dev_err(nor->dev, 405 "Attempted to modify a protected sector.\n"); 406 407 nor->write_reg(nor, SPINOR_OP_CLFSR, NULL, 0); 408 return -EIO; 409 } 410 411 return fsr & FSR_READY; 412 } 413 414 static int spi_nor_ready(struct spi_nor *nor) 415 { 416 int sr, fsr; 417 418 sr = spi_nor_sr_ready(nor); 419 if (sr < 0) 420 return sr; 421 fsr = nor->flags & SNOR_F_USE_FSR ? spi_nor_fsr_ready(nor) : 1; 422 if (fsr < 0) 423 return fsr; 424 return sr && fsr; 425 } 426 427 /* 428 * Service routine to read status register until ready, or timeout occurs. 429 * Returns non-zero if error. 430 */ 431 static int spi_nor_wait_till_ready_with_timeout(struct spi_nor *nor, 432 unsigned long timeout) 433 { 434 unsigned long timebase; 435 int ret; 436 437 timebase = get_timer(0); 438 439 while (get_timer(timebase) < timeout) { 440 ret = spi_nor_ready(nor); 441 if (ret < 0) 442 return ret; 443 if (ret) 444 return 0; 445 } 446 447 dev_err(nor->dev, "flash operation timed out\n"); 448 449 return -ETIMEDOUT; 450 } 451 452 static int spi_nor_wait_till_ready(struct spi_nor *nor) 453 { 454 return spi_nor_wait_till_ready_with_timeout(nor, 455 DEFAULT_READY_WAIT_JIFFIES); 456 } 457 458 #ifdef CONFIG_SPI_FLASH_BAR 459 /* 460 * This "clean_bar" is necessary in a situation when one was accessing 461 * spi flash memory > 16 MiB by using Bank Address Register's BA24 bit. 462 * 463 * After it the BA24 bit shall be cleared to allow access to correct 464 * memory region after SW reset (by calling "reset" command). 465 * 466 * Otherwise, the BA24 bit may be left set and then after reset, the 467 * ROM would read/write/erase SPL from 16 MiB * bank_sel address. 468 */ 469 static int clean_bar(struct spi_nor *nor) 470 { 471 u8 cmd, bank_sel = 0; 472 473 if (nor->bank_curr == 0) 474 return 0; 475 cmd = nor->bank_write_cmd; 476 nor->bank_curr = 0; 477 write_enable(nor); 478 479 return nor->write_reg(nor, cmd, &bank_sel, 1); 480 } 481 482 static int write_bar(struct spi_nor *nor, u32 offset) 483 { 484 u8 cmd, bank_sel; 485 int ret; 486 487 bank_sel = offset / SZ_16M; 488 if (bank_sel == nor->bank_curr) 489 goto bar_end; 490 491 cmd = nor->bank_write_cmd; 492 write_enable(nor); 493 ret = nor->write_reg(nor, cmd, &bank_sel, 1); 494 if (ret < 0) { 495 debug("SF: fail to write bank register\n"); 496 return ret; 497 } 498 499 bar_end: 500 nor->bank_curr = bank_sel; 501 return nor->bank_curr; 502 } 503 504 static int read_bar(struct spi_nor *nor, const struct flash_info *info) 505 { 506 u8 curr_bank = 0; 507 int ret; 508 509 switch (JEDEC_MFR(info)) { 510 case SNOR_MFR_SPANSION: 511 nor->bank_read_cmd = SPINOR_OP_BRRD; 512 nor->bank_write_cmd = SPINOR_OP_BRWR; 513 break; 514 default: 515 nor->bank_read_cmd = SPINOR_OP_RDEAR; 516 nor->bank_write_cmd = SPINOR_OP_WREAR; 517 } 518 519 ret = nor->read_reg(nor, nor->bank_read_cmd, 520 &curr_bank, 1); 521 if (ret) { 522 debug("SF: fail to read bank addr register\n"); 523 return ret; 524 } 525 nor->bank_curr = curr_bank; 526 527 return 0; 528 } 529 #endif 530 531 /* 532 * Initiate the erasure of a single sector 533 */ 534 static int spi_nor_erase_sector(struct spi_nor *nor, u32 addr) 535 { 536 struct spi_mem_op op = 537 SPI_MEM_OP(SPI_MEM_OP_CMD(nor->erase_opcode, 1), 538 SPI_MEM_OP_ADDR(nor->addr_width, addr, 1), 539 SPI_MEM_OP_NO_DUMMY, 540 SPI_MEM_OP_NO_DATA); 541 542 if (nor->erase) 543 return nor->erase(nor, addr); 544 545 /* 546 * Default implementation, if driver doesn't have a specialized HW 547 * control 548 */ 549 return spi_mem_exec_op(nor->spi, &op); 550 } 551 552 /* 553 * Erase an address range on the nor chip. The address range may extend 554 * one or more erase sectors. Return an error is there is a problem erasing. 555 */ 556 static int spi_nor_erase(struct mtd_info *mtd, struct erase_info *instr) 557 { 558 struct spi_nor *nor = mtd_to_spi_nor(mtd); 559 u32 addr, len, rem; 560 int ret; 561 562 dev_dbg(nor->dev, "at 0x%llx, len %lld\n", (long long)instr->addr, 563 (long long)instr->len); 564 565 div_u64_rem(instr->len, mtd->erasesize, &rem); 566 if (rem) 567 return -EINVAL; 568 569 addr = instr->addr; 570 len = instr->len; 571 572 while (len) { 573 #ifdef CONFIG_SPI_FLASH_BAR 574 ret = write_bar(nor, addr); 575 if (ret < 0) 576 return ret; 577 #endif 578 write_enable(nor); 579 580 ret = spi_nor_erase_sector(nor, addr); 581 if (ret) 582 goto erase_err; 583 584 addr += mtd->erasesize; 585 len -= mtd->erasesize; 586 587 ret = spi_nor_wait_till_ready(nor); 588 if (ret) 589 goto erase_err; 590 } 591 592 erase_err: 593 #ifdef CONFIG_SPI_FLASH_BAR 594 ret = clean_bar(nor); 595 #endif 596 write_disable(nor); 597 598 return ret; 599 } 600 601 #if defined(CONFIG_SPI_FLASH_STMICRO) || defined(CONFIG_SPI_FLASH_SST) 602 /* Write status register and ensure bits in mask match written values */ 603 static int write_sr_and_check(struct spi_nor *nor, u8 status_new, u8 mask) 604 { 605 int ret; 606 607 write_enable(nor); 608 ret = write_sr(nor, status_new); 609 if (ret) 610 return ret; 611 612 ret = spi_nor_wait_till_ready(nor); 613 if (ret) 614 return ret; 615 616 ret = read_sr(nor); 617 if (ret < 0) 618 return ret; 619 620 return ((ret & mask) != (status_new & mask)) ? -EIO : 0; 621 } 622 623 static void stm_get_locked_range(struct spi_nor *nor, u8 sr, loff_t *ofs, 624 uint64_t *len) 625 { 626 struct mtd_info *mtd = &nor->mtd; 627 u8 mask = SR_BP2 | SR_BP1 | SR_BP0; 628 int shift = ffs(mask) - 1; 629 int pow; 630 631 if (!(sr & mask)) { 632 /* No protection */ 633 *ofs = 0; 634 *len = 0; 635 } else { 636 pow = ((sr & mask) ^ mask) >> shift; 637 *len = mtd->size >> pow; 638 if (nor->flags & SNOR_F_HAS_SR_TB && sr & SR_TB) 639 *ofs = 0; 640 else 641 *ofs = mtd->size - *len; 642 } 643 } 644 645 /* 646 * Return 1 if the entire region is locked (if @locked is true) or unlocked (if 647 * @locked is false); 0 otherwise 648 */ 649 static int stm_check_lock_status_sr(struct spi_nor *nor, loff_t ofs, u64 len, 650 u8 sr, bool locked) 651 { 652 loff_t lock_offs; 653 uint64_t lock_len; 654 655 if (!len) 656 return 1; 657 658 stm_get_locked_range(nor, sr, &lock_offs, &lock_len); 659 660 if (locked) 661 /* Requested range is a sub-range of locked range */ 662 return (ofs + len <= lock_offs + lock_len) && (ofs >= lock_offs); 663 else 664 /* Requested range does not overlap with locked range */ 665 return (ofs >= lock_offs + lock_len) || (ofs + len <= lock_offs); 666 } 667 668 static int stm_is_locked_sr(struct spi_nor *nor, loff_t ofs, uint64_t len, 669 u8 sr) 670 { 671 return stm_check_lock_status_sr(nor, ofs, len, sr, true); 672 } 673 674 static int stm_is_unlocked_sr(struct spi_nor *nor, loff_t ofs, uint64_t len, 675 u8 sr) 676 { 677 return stm_check_lock_status_sr(nor, ofs, len, sr, false); 678 } 679 680 /* 681 * Lock a region of the flash. Compatible with ST Micro and similar flash. 682 * Supports the block protection bits BP{0,1,2} in the status register 683 * (SR). Does not support these features found in newer SR bitfields: 684 * - SEC: sector/block protect - only handle SEC=0 (block protect) 685 * - CMP: complement protect - only support CMP=0 (range is not complemented) 686 * 687 * Support for the following is provided conditionally for some flash: 688 * - TB: top/bottom protect 689 * 690 * Sample table portion for 8MB flash (Winbond w25q64fw): 691 * 692 * SEC | TB | BP2 | BP1 | BP0 | Prot Length | Protected Portion 693 * -------------------------------------------------------------------------- 694 * X | X | 0 | 0 | 0 | NONE | NONE 695 * 0 | 0 | 0 | 0 | 1 | 128 KB | Upper 1/64 696 * 0 | 0 | 0 | 1 | 0 | 256 KB | Upper 1/32 697 * 0 | 0 | 0 | 1 | 1 | 512 KB | Upper 1/16 698 * 0 | 0 | 1 | 0 | 0 | 1 MB | Upper 1/8 699 * 0 | 0 | 1 | 0 | 1 | 2 MB | Upper 1/4 700 * 0 | 0 | 1 | 1 | 0 | 4 MB | Upper 1/2 701 * X | X | 1 | 1 | 1 | 8 MB | ALL 702 * ------|-------|-------|-------|-------|---------------|------------------- 703 * 0 | 1 | 0 | 0 | 1 | 128 KB | Lower 1/64 704 * 0 | 1 | 0 | 1 | 0 | 256 KB | Lower 1/32 705 * 0 | 1 | 0 | 1 | 1 | 512 KB | Lower 1/16 706 * 0 | 1 | 1 | 0 | 0 | 1 MB | Lower 1/8 707 * 0 | 1 | 1 | 0 | 1 | 2 MB | Lower 1/4 708 * 0 | 1 | 1 | 1 | 0 | 4 MB | Lower 1/2 709 * 710 * Returns negative on errors, 0 on success. 711 */ 712 static int stm_lock(struct spi_nor *nor, loff_t ofs, uint64_t len) 713 { 714 struct mtd_info *mtd = &nor->mtd; 715 int status_old, status_new; 716 u8 mask = SR_BP2 | SR_BP1 | SR_BP0; 717 u8 shift = ffs(mask) - 1, pow, val; 718 loff_t lock_len; 719 bool can_be_top = true, can_be_bottom = nor->flags & SNOR_F_HAS_SR_TB; 720 bool use_top; 721 722 status_old = read_sr(nor); 723 if (status_old < 0) 724 return status_old; 725 726 /* If nothing in our range is unlocked, we don't need to do anything */ 727 if (stm_is_locked_sr(nor, ofs, len, status_old)) 728 return 0; 729 730 /* If anything below us is unlocked, we can't use 'bottom' protection */ 731 if (!stm_is_locked_sr(nor, 0, ofs, status_old)) 732 can_be_bottom = false; 733 734 /* If anything above us is unlocked, we can't use 'top' protection */ 735 if (!stm_is_locked_sr(nor, ofs + len, mtd->size - (ofs + len), 736 status_old)) 737 can_be_top = false; 738 739 if (!can_be_bottom && !can_be_top) 740 return -EINVAL; 741 742 /* Prefer top, if both are valid */ 743 use_top = can_be_top; 744 745 /* lock_len: length of region that should end up locked */ 746 if (use_top) 747 lock_len = mtd->size - ofs; 748 else 749 lock_len = ofs + len; 750 751 /* 752 * Need smallest pow such that: 753 * 754 * 1 / (2^pow) <= (len / size) 755 * 756 * so (assuming power-of-2 size) we do: 757 * 758 * pow = ceil(log2(size / len)) = log2(size) - floor(log2(len)) 759 */ 760 pow = ilog2(mtd->size) - ilog2(lock_len); 761 val = mask - (pow << shift); 762 if (val & ~mask) 763 return -EINVAL; 764 /* Don't "lock" with no region! */ 765 if (!(val & mask)) 766 return -EINVAL; 767 768 status_new = (status_old & ~mask & ~SR_TB) | val; 769 770 /* Disallow further writes if WP pin is asserted */ 771 status_new |= SR_SRWD; 772 773 if (!use_top) 774 status_new |= SR_TB; 775 776 /* Don't bother if they're the same */ 777 if (status_new == status_old) 778 return 0; 779 780 /* Only modify protection if it will not unlock other areas */ 781 if ((status_new & mask) < (status_old & mask)) 782 return -EINVAL; 783 784 return write_sr_and_check(nor, status_new, mask); 785 } 786 787 /* 788 * Unlock a region of the flash. See stm_lock() for more info 789 * 790 * Returns negative on errors, 0 on success. 791 */ 792 static int stm_unlock(struct spi_nor *nor, loff_t ofs, uint64_t len) 793 { 794 struct mtd_info *mtd = &nor->mtd; 795 int status_old, status_new; 796 u8 mask = SR_BP2 | SR_BP1 | SR_BP0; 797 u8 shift = ffs(mask) - 1, pow, val; 798 loff_t lock_len; 799 bool can_be_top = true, can_be_bottom = nor->flags & SNOR_F_HAS_SR_TB; 800 bool use_top; 801 802 status_old = read_sr(nor); 803 if (status_old < 0) 804 return status_old; 805 806 /* If nothing in our range is locked, we don't need to do anything */ 807 if (stm_is_unlocked_sr(nor, ofs, len, status_old)) 808 return 0; 809 810 /* If anything below us is locked, we can't use 'top' protection */ 811 if (!stm_is_unlocked_sr(nor, 0, ofs, status_old)) 812 can_be_top = false; 813 814 /* If anything above us is locked, we can't use 'bottom' protection */ 815 if (!stm_is_unlocked_sr(nor, ofs + len, mtd->size - (ofs + len), 816 status_old)) 817 can_be_bottom = false; 818 819 if (!can_be_bottom && !can_be_top) 820 return -EINVAL; 821 822 /* Prefer top, if both are valid */ 823 use_top = can_be_top; 824 825 /* lock_len: length of region that should remain locked */ 826 if (use_top) 827 lock_len = mtd->size - (ofs + len); 828 else 829 lock_len = ofs; 830 831 /* 832 * Need largest pow such that: 833 * 834 * 1 / (2^pow) >= (len / size) 835 * 836 * so (assuming power-of-2 size) we do: 837 * 838 * pow = floor(log2(size / len)) = log2(size) - ceil(log2(len)) 839 */ 840 pow = ilog2(mtd->size) - order_base_2(lock_len); 841 if (lock_len == 0) { 842 val = 0; /* fully unlocked */ 843 } else { 844 val = mask - (pow << shift); 845 /* Some power-of-two sizes are not supported */ 846 if (val & ~mask) 847 return -EINVAL; 848 } 849 850 status_new = (status_old & ~mask & ~SR_TB) | val; 851 852 /* Don't protect status register if we're fully unlocked */ 853 if (lock_len == 0) 854 status_new &= ~SR_SRWD; 855 856 if (!use_top) 857 status_new |= SR_TB; 858 859 /* Don't bother if they're the same */ 860 if (status_new == status_old) 861 return 0; 862 863 /* Only modify protection if it will not lock other areas */ 864 if ((status_new & mask) > (status_old & mask)) 865 return -EINVAL; 866 867 return write_sr_and_check(nor, status_new, mask); 868 } 869 870 /* 871 * Check if a region of the flash is (completely) locked. See stm_lock() for 872 * more info. 873 * 874 * Returns 1 if entire region is locked, 0 if any portion is unlocked, and 875 * negative on errors. 876 */ 877 static int stm_is_locked(struct spi_nor *nor, loff_t ofs, uint64_t len) 878 { 879 int status; 880 881 status = read_sr(nor); 882 if (status < 0) 883 return status; 884 885 return stm_is_locked_sr(nor, ofs, len, status); 886 } 887 #endif /* CONFIG_SPI_FLASH_STMICRO */ 888 889 static const struct flash_info *spi_nor_read_id(struct spi_nor *nor) 890 { 891 int tmp; 892 u8 id[SPI_NOR_MAX_ID_LEN]; 893 const struct flash_info *info; 894 895 tmp = nor->read_reg(nor, SPINOR_OP_RDID, id, SPI_NOR_MAX_ID_LEN); 896 if (tmp < 0) { 897 dev_dbg(nor->dev, "error %d reading JEDEC ID\n", tmp); 898 return ERR_PTR(tmp); 899 } 900 901 info = spi_nor_ids; 902 for (; info->name; info++) { 903 if (info->id_len) { 904 if (!memcmp(info->id, id, info->id_len)) 905 return info; 906 } 907 } 908 909 dev_err(nor->dev, "unrecognized JEDEC id bytes: %02x, %02x, %02x\n", 910 id[0], id[1], id[2]); 911 return ERR_PTR(-ENODEV); 912 } 913 914 static int spi_nor_read(struct mtd_info *mtd, loff_t from, size_t len, 915 size_t *retlen, u_char *buf) 916 { 917 struct spi_nor *nor = mtd_to_spi_nor(mtd); 918 int ret; 919 920 dev_dbg(nor->dev, "from 0x%08x, len %zd\n", (u32)from, len); 921 922 while (len) { 923 loff_t addr = from; 924 size_t read_len = len; 925 926 #ifdef CONFIG_SPI_FLASH_BAR 927 u32 remain_len; 928 929 ret = write_bar(nor, addr); 930 if (ret < 0) 931 return log_ret(ret); 932 remain_len = (SZ_16M * (nor->bank_curr + 1)) - addr; 933 934 if (len < remain_len) 935 read_len = len; 936 else 937 read_len = remain_len; 938 #endif 939 940 ret = nor->read(nor, addr, read_len, buf); 941 if (ret == 0) { 942 /* We shouldn't see 0-length reads */ 943 ret = -EIO; 944 goto read_err; 945 } 946 if (ret < 0) 947 goto read_err; 948 949 *retlen += ret; 950 buf += ret; 951 from += ret; 952 len -= ret; 953 } 954 ret = 0; 955 956 read_err: 957 #ifdef CONFIG_SPI_FLASH_BAR 958 ret = clean_bar(nor); 959 #endif 960 return ret; 961 } 962 963 #ifdef CONFIG_SPI_FLASH_SST 964 /* 965 * sst26 flash series has its own block protection implementation: 966 * 4x - 8 KByte blocks - read & write protection bits - upper addresses 967 * 1x - 32 KByte blocks - write protection bits 968 * rest - 64 KByte blocks - write protection bits 969 * 1x - 32 KByte blocks - write protection bits 970 * 4x - 8 KByte blocks - read & write protection bits - lower addresses 971 * 972 * We'll support only per 64k lock/unlock so lower and upper 64 KByte region 973 * will be treated as single block. 974 */ 975 #define SST26_BPR_8K_NUM 4 976 #define SST26_MAX_BPR_REG_LEN (18 + 1) 977 #define SST26_BOUND_REG_SIZE ((32 + SST26_BPR_8K_NUM * 8) * SZ_1K) 978 979 enum lock_ctl { 980 SST26_CTL_LOCK, 981 SST26_CTL_UNLOCK, 982 SST26_CTL_CHECK 983 }; 984 985 static bool sst26_process_bpr(u32 bpr_size, u8 *cmd, u32 bit, enum lock_ctl ctl) 986 { 987 switch (ctl) { 988 case SST26_CTL_LOCK: 989 cmd[bpr_size - (bit / 8) - 1] |= BIT(bit % 8); 990 break; 991 case SST26_CTL_UNLOCK: 992 cmd[bpr_size - (bit / 8) - 1] &= ~BIT(bit % 8); 993 break; 994 case SST26_CTL_CHECK: 995 return !!(cmd[bpr_size - (bit / 8) - 1] & BIT(bit % 8)); 996 } 997 998 return false; 999 } 1000 1001 /* 1002 * Lock, unlock or check lock status of the flash region of the flash (depending 1003 * on the lock_ctl value) 1004 */ 1005 static int sst26_lock_ctl(struct spi_nor *nor, loff_t ofs, uint64_t len, enum lock_ctl ctl) 1006 { 1007 struct mtd_info *mtd = &nor->mtd; 1008 u32 i, bpr_ptr, rptr_64k, lptr_64k, bpr_size; 1009 bool lower_64k = false, upper_64k = false; 1010 u8 bpr_buff[SST26_MAX_BPR_REG_LEN] = {}; 1011 int ret; 1012 1013 /* Check length and offset for 64k alignment */ 1014 if ((ofs & (SZ_64K - 1)) || (len & (SZ_64K - 1))) { 1015 dev_err(nor->dev, "length or offset is not 64KiB allighned\n"); 1016 return -EINVAL; 1017 } 1018 1019 if (ofs + len > mtd->size) { 1020 dev_err(nor->dev, "range is more than device size: %#llx + %#llx > %#llx\n", 1021 ofs, len, mtd->size); 1022 return -EINVAL; 1023 } 1024 1025 /* SST26 family has only 16 Mbit, 32 Mbit and 64 Mbit IC */ 1026 if (mtd->size != SZ_2M && 1027 mtd->size != SZ_4M && 1028 mtd->size != SZ_8M) 1029 return -EINVAL; 1030 1031 bpr_size = 2 + (mtd->size / SZ_64K / 8); 1032 1033 ret = nor->read_reg(nor, SPINOR_OP_READ_BPR, bpr_buff, bpr_size); 1034 if (ret < 0) { 1035 dev_err(nor->dev, "fail to read block-protection register\n"); 1036 return ret; 1037 } 1038 1039 rptr_64k = min_t(u32, ofs + len, mtd->size - SST26_BOUND_REG_SIZE); 1040 lptr_64k = max_t(u32, ofs, SST26_BOUND_REG_SIZE); 1041 1042 upper_64k = ((ofs + len) > (mtd->size - SST26_BOUND_REG_SIZE)); 1043 lower_64k = (ofs < SST26_BOUND_REG_SIZE); 1044 1045 /* Lower bits in block-protection register are about 64k region */ 1046 bpr_ptr = lptr_64k / SZ_64K - 1; 1047 1048 /* Process 64K blocks region */ 1049 while (lptr_64k < rptr_64k) { 1050 if (sst26_process_bpr(bpr_size, bpr_buff, bpr_ptr, ctl)) 1051 return EACCES; 1052 1053 bpr_ptr++; 1054 lptr_64k += SZ_64K; 1055 } 1056 1057 /* 32K and 8K region bits in BPR are after 64k region bits */ 1058 bpr_ptr = (mtd->size - 2 * SST26_BOUND_REG_SIZE) / SZ_64K; 1059 1060 /* Process lower 32K block region */ 1061 if (lower_64k) 1062 if (sst26_process_bpr(bpr_size, bpr_buff, bpr_ptr, ctl)) 1063 return EACCES; 1064 1065 bpr_ptr++; 1066 1067 /* Process upper 32K block region */ 1068 if (upper_64k) 1069 if (sst26_process_bpr(bpr_size, bpr_buff, bpr_ptr, ctl)) 1070 return EACCES; 1071 1072 bpr_ptr++; 1073 1074 /* Process lower 8K block regions */ 1075 for (i = 0; i < SST26_BPR_8K_NUM; i++) { 1076 if (lower_64k) 1077 if (sst26_process_bpr(bpr_size, bpr_buff, bpr_ptr, ctl)) 1078 return EACCES; 1079 1080 /* In 8K area BPR has both read and write protection bits */ 1081 bpr_ptr += 2; 1082 } 1083 1084 /* Process upper 8K block regions */ 1085 for (i = 0; i < SST26_BPR_8K_NUM; i++) { 1086 if (upper_64k) 1087 if (sst26_process_bpr(bpr_size, bpr_buff, bpr_ptr, ctl)) 1088 return EACCES; 1089 1090 /* In 8K area BPR has both read and write protection bits */ 1091 bpr_ptr += 2; 1092 } 1093 1094 /* If we check region status we don't need to write BPR back */ 1095 if (ctl == SST26_CTL_CHECK) 1096 return 0; 1097 1098 ret = nor->write_reg(nor, SPINOR_OP_WRITE_BPR, bpr_buff, bpr_size); 1099 if (ret < 0) { 1100 dev_err(nor->dev, "fail to write block-protection register\n"); 1101 return ret; 1102 } 1103 1104 return 0; 1105 } 1106 1107 static int sst26_unlock(struct spi_nor *nor, loff_t ofs, uint64_t len) 1108 { 1109 return sst26_lock_ctl(nor, ofs, len, SST26_CTL_UNLOCK); 1110 } 1111 1112 static int sst26_lock(struct spi_nor *nor, loff_t ofs, uint64_t len) 1113 { 1114 return sst26_lock_ctl(nor, ofs, len, SST26_CTL_LOCK); 1115 } 1116 1117 /* 1118 * Returns EACCES (positive value) if region is locked, 0 if region is unlocked, 1119 * and negative on errors. 1120 */ 1121 static int sst26_is_locked(struct spi_nor *nor, loff_t ofs, uint64_t len) 1122 { 1123 /* 1124 * is_locked function is used for check before reading or erasing flash 1125 * region, so offset and length might be not 64k allighned, so adjust 1126 * them to be 64k allighned as sst26_lock_ctl works only with 64k 1127 * allighned regions. 1128 */ 1129 ofs -= ofs & (SZ_64K - 1); 1130 len = len & (SZ_64K - 1) ? (len & ~(SZ_64K - 1)) + SZ_64K : len; 1131 1132 return sst26_lock_ctl(nor, ofs, len, SST26_CTL_CHECK); 1133 } 1134 1135 static int sst_write_byteprogram(struct spi_nor *nor, loff_t to, size_t len, 1136 size_t *retlen, const u_char *buf) 1137 { 1138 size_t actual; 1139 int ret = 0; 1140 1141 for (actual = 0; actual < len; actual++) { 1142 nor->program_opcode = SPINOR_OP_BP; 1143 1144 write_enable(nor); 1145 /* write one byte. */ 1146 ret = nor->write(nor, to, 1, buf + actual); 1147 if (ret < 0) 1148 goto sst_write_err; 1149 ret = spi_nor_wait_till_ready(nor); 1150 if (ret) 1151 goto sst_write_err; 1152 to++; 1153 } 1154 1155 sst_write_err: 1156 write_disable(nor); 1157 return ret; 1158 } 1159 1160 static int sst_write(struct mtd_info *mtd, loff_t to, size_t len, 1161 size_t *retlen, const u_char *buf) 1162 { 1163 struct spi_nor *nor = mtd_to_spi_nor(mtd); 1164 struct spi_slave *spi = nor->spi; 1165 size_t actual; 1166 int ret; 1167 1168 dev_dbg(nor->dev, "to 0x%08x, len %zd\n", (u32)to, len); 1169 if (spi->mode & SPI_TX_BYTE) 1170 return sst_write_byteprogram(nor, to, len, retlen, buf); 1171 1172 write_enable(nor); 1173 1174 nor->sst_write_second = false; 1175 1176 actual = to % 2; 1177 /* Start write from odd address. */ 1178 if (actual) { 1179 nor->program_opcode = SPINOR_OP_BP; 1180 1181 /* write one byte. */ 1182 ret = nor->write(nor, to, 1, buf); 1183 if (ret < 0) 1184 goto sst_write_err; 1185 ret = spi_nor_wait_till_ready(nor); 1186 if (ret) 1187 goto sst_write_err; 1188 } 1189 to += actual; 1190 1191 /* Write out most of the data here. */ 1192 for (; actual < len - 1; actual += 2) { 1193 nor->program_opcode = SPINOR_OP_AAI_WP; 1194 1195 /* write two bytes. */ 1196 ret = nor->write(nor, to, 2, buf + actual); 1197 if (ret < 0) 1198 goto sst_write_err; 1199 ret = spi_nor_wait_till_ready(nor); 1200 if (ret) 1201 goto sst_write_err; 1202 to += 2; 1203 nor->sst_write_second = true; 1204 } 1205 nor->sst_write_second = false; 1206 1207 write_disable(nor); 1208 ret = spi_nor_wait_till_ready(nor); 1209 if (ret) 1210 goto sst_write_err; 1211 1212 /* Write out trailing byte if it exists. */ 1213 if (actual != len) { 1214 write_enable(nor); 1215 1216 nor->program_opcode = SPINOR_OP_BP; 1217 ret = nor->write(nor, to, 1, buf + actual); 1218 if (ret < 0) 1219 goto sst_write_err; 1220 ret = spi_nor_wait_till_ready(nor); 1221 if (ret) 1222 goto sst_write_err; 1223 write_disable(nor); 1224 actual += 1; 1225 } 1226 sst_write_err: 1227 *retlen += actual; 1228 return ret; 1229 } 1230 #endif 1231 /* 1232 * Write an address range to the nor chip. Data must be written in 1233 * FLASH_PAGESIZE chunks. The address range may be any size provided 1234 * it is within the physical boundaries. 1235 */ 1236 static int spi_nor_write(struct mtd_info *mtd, loff_t to, size_t len, 1237 size_t *retlen, const u_char *buf) 1238 { 1239 struct spi_nor *nor = mtd_to_spi_nor(mtd); 1240 size_t page_offset, page_remain, i; 1241 ssize_t ret; 1242 1243 dev_dbg(nor->dev, "to 0x%08x, len %zd\n", (u32)to, len); 1244 1245 for (i = 0; i < len; ) { 1246 ssize_t written; 1247 loff_t addr = to + i; 1248 1249 /* 1250 * If page_size is a power of two, the offset can be quickly 1251 * calculated with an AND operation. On the other cases we 1252 * need to do a modulus operation (more expensive). 1253 * Power of two numbers have only one bit set and we can use 1254 * the instruction hweight32 to detect if we need to do a 1255 * modulus (do_div()) or not. 1256 */ 1257 if (hweight32(nor->page_size) == 1) { 1258 page_offset = addr & (nor->page_size - 1); 1259 } else { 1260 u64 aux = addr; 1261 1262 page_offset = do_div(aux, nor->page_size); 1263 } 1264 /* the size of data remaining on the first page */ 1265 page_remain = min_t(size_t, 1266 nor->page_size - page_offset, len - i); 1267 1268 #ifdef CONFIG_SPI_FLASH_BAR 1269 ret = write_bar(nor, addr); 1270 if (ret < 0) 1271 return ret; 1272 #endif 1273 write_enable(nor); 1274 ret = nor->write(nor, addr, page_remain, buf + i); 1275 if (ret < 0) 1276 goto write_err; 1277 written = ret; 1278 1279 ret = spi_nor_wait_till_ready(nor); 1280 if (ret) 1281 goto write_err; 1282 *retlen += written; 1283 i += written; 1284 } 1285 1286 write_err: 1287 #ifdef CONFIG_SPI_FLASH_BAR 1288 ret = clean_bar(nor); 1289 #endif 1290 return ret; 1291 } 1292 1293 #ifdef CONFIG_SPI_FLASH_MACRONIX 1294 /** 1295 * macronix_quad_enable() - set QE bit in Status Register. 1296 * @nor: pointer to a 'struct spi_nor' 1297 * 1298 * Set the Quad Enable (QE) bit in the Status Register. 1299 * 1300 * bit 6 of the Status Register is the QE bit for Macronix like QSPI memories. 1301 * 1302 * Return: 0 on success, -errno otherwise. 1303 */ 1304 static int macronix_quad_enable(struct spi_nor *nor) 1305 { 1306 int ret, val; 1307 1308 val = read_sr(nor); 1309 if (val < 0) 1310 return val; 1311 if (val & SR_QUAD_EN_MX) 1312 return 0; 1313 1314 write_enable(nor); 1315 1316 write_sr(nor, val | SR_QUAD_EN_MX); 1317 1318 ret = spi_nor_wait_till_ready(nor); 1319 if (ret) 1320 return ret; 1321 1322 ret = read_sr(nor); 1323 if (!(ret > 0 && (ret & SR_QUAD_EN_MX))) { 1324 dev_err(nor->dev, "Macronix Quad bit not set\n"); 1325 return -EINVAL; 1326 } 1327 1328 return 0; 1329 } 1330 #endif 1331 1332 #if defined(CONFIG_SPI_FLASH_SPANSION) || defined(CONFIG_SPI_FLASH_WINBOND) 1333 /* 1334 * Write status Register and configuration register with 2 bytes 1335 * The first byte will be written to the status register, while the 1336 * second byte will be written to the configuration register. 1337 * Return negative if error occurred. 1338 */ 1339 static int write_sr_cr(struct spi_nor *nor, u8 *sr_cr) 1340 { 1341 int ret; 1342 1343 write_enable(nor); 1344 1345 ret = nor->write_reg(nor, SPINOR_OP_WRSR, sr_cr, 2); 1346 if (ret < 0) { 1347 dev_dbg(nor->dev, 1348 "error while writing configuration register\n"); 1349 return -EINVAL; 1350 } 1351 1352 ret = spi_nor_wait_till_ready(nor); 1353 if (ret) { 1354 dev_dbg(nor->dev, 1355 "timeout while writing configuration register\n"); 1356 return ret; 1357 } 1358 1359 return 0; 1360 } 1361 1362 /** 1363 * spansion_read_cr_quad_enable() - set QE bit in Configuration Register. 1364 * @nor: pointer to a 'struct spi_nor' 1365 * 1366 * Set the Quad Enable (QE) bit in the Configuration Register. 1367 * This function should be used with QSPI memories supporting the Read 1368 * Configuration Register (35h) instruction. 1369 * 1370 * bit 1 of the Configuration Register is the QE bit for Spansion like QSPI 1371 * memories. 1372 * 1373 * Return: 0 on success, -errno otherwise. 1374 */ 1375 static int spansion_read_cr_quad_enable(struct spi_nor *nor) 1376 { 1377 u8 sr_cr[2]; 1378 int ret; 1379 1380 /* Check current Quad Enable bit value. */ 1381 ret = read_cr(nor); 1382 if (ret < 0) { 1383 dev_dbg(dev, "error while reading configuration register\n"); 1384 return -EINVAL; 1385 } 1386 1387 if (ret & CR_QUAD_EN_SPAN) 1388 return 0; 1389 1390 sr_cr[1] = ret | CR_QUAD_EN_SPAN; 1391 1392 /* Keep the current value of the Status Register. */ 1393 ret = read_sr(nor); 1394 if (ret < 0) { 1395 dev_dbg(dev, "error while reading status register\n"); 1396 return -EINVAL; 1397 } 1398 sr_cr[0] = ret; 1399 1400 ret = write_sr_cr(nor, sr_cr); 1401 if (ret) 1402 return ret; 1403 1404 /* Read back and check it. */ 1405 ret = read_cr(nor); 1406 if (!(ret > 0 && (ret & CR_QUAD_EN_SPAN))) { 1407 dev_dbg(nor->dev, "Spansion Quad bit not set\n"); 1408 return -EINVAL; 1409 } 1410 1411 return 0; 1412 } 1413 1414 #if CONFIG_IS_ENABLED(SPI_FLASH_SFDP_SUPPORT) 1415 /** 1416 * spansion_no_read_cr_quad_enable() - set QE bit in Configuration Register. 1417 * @nor: pointer to a 'struct spi_nor' 1418 * 1419 * Set the Quad Enable (QE) bit in the Configuration Register. 1420 * This function should be used with QSPI memories not supporting the Read 1421 * Configuration Register (35h) instruction. 1422 * 1423 * bit 1 of the Configuration Register is the QE bit for Spansion like QSPI 1424 * memories. 1425 * 1426 * Return: 0 on success, -errno otherwise. 1427 */ 1428 static int spansion_no_read_cr_quad_enable(struct spi_nor *nor) 1429 { 1430 u8 sr_cr[2]; 1431 int ret; 1432 1433 /* Keep the current value of the Status Register. */ 1434 ret = read_sr(nor); 1435 if (ret < 0) { 1436 dev_dbg(nor->dev, "error while reading status register\n"); 1437 return -EINVAL; 1438 } 1439 sr_cr[0] = ret; 1440 sr_cr[1] = CR_QUAD_EN_SPAN; 1441 1442 return write_sr_cr(nor, sr_cr); 1443 } 1444 1445 #endif /* CONFIG_SPI_FLASH_SFDP_SUPPORT */ 1446 #endif /* CONFIG_SPI_FLASH_SPANSION */ 1447 1448 #ifdef CONFIG_SPI_FLASH_NORMEM 1449 /** 1450 * normem_quad_enable() - set QE bit in Status Register. 1451 * @nor: pointer to a 'struct spi_nor' 1452 * 1453 * Set the Quad Enable (QE) bit in the Status Register. 1454 * 1455 * bit 6 of the Status Register is the QE bit for Macronix like QSPI memories. 1456 * 1457 * Return: 0 on success, -errno otherwise. 1458 */ 1459 static int normem_quad_enable(struct spi_nor *nor) 1460 { 1461 int ret, val; 1462 1463 val = read_cr(nor); 1464 if (val < 0) 1465 return val; 1466 if (val & SR_QUAD_EN_NORMEM) 1467 return 0; 1468 1469 write_enable(nor); 1470 1471 write_cr(nor, val | SR_QUAD_EN_NORMEM); 1472 1473 ret = spi_nor_wait_till_ready(nor); 1474 if (ret) 1475 return ret; 1476 1477 ret = read_cr(nor); 1478 if (!(ret > 0 && (ret & SR_QUAD_EN_NORMEM))) { 1479 dev_err(nor->dev, "NORMEM Quad bit not set\n"); 1480 return -EINVAL; 1481 } 1482 1483 return 0; 1484 } 1485 #endif 1486 1487 struct spi_nor_read_command { 1488 u8 num_mode_clocks; 1489 u8 num_wait_states; 1490 u8 opcode; 1491 enum spi_nor_protocol proto; 1492 }; 1493 1494 struct spi_nor_pp_command { 1495 u8 opcode; 1496 enum spi_nor_protocol proto; 1497 }; 1498 1499 enum spi_nor_read_command_index { 1500 SNOR_CMD_READ, 1501 SNOR_CMD_READ_FAST, 1502 SNOR_CMD_READ_1_1_1_DTR, 1503 1504 /* Dual SPI */ 1505 SNOR_CMD_READ_1_1_2, 1506 SNOR_CMD_READ_1_2_2, 1507 SNOR_CMD_READ_2_2_2, 1508 SNOR_CMD_READ_1_2_2_DTR, 1509 1510 /* Quad SPI */ 1511 SNOR_CMD_READ_1_1_4, 1512 SNOR_CMD_READ_1_4_4, 1513 SNOR_CMD_READ_4_4_4, 1514 SNOR_CMD_READ_1_4_4_DTR, 1515 1516 /* Octo SPI */ 1517 SNOR_CMD_READ_1_1_8, 1518 SNOR_CMD_READ_1_8_8, 1519 SNOR_CMD_READ_8_8_8, 1520 SNOR_CMD_READ_1_8_8_DTR, 1521 1522 SNOR_CMD_READ_MAX 1523 }; 1524 1525 enum spi_nor_pp_command_index { 1526 SNOR_CMD_PP, 1527 1528 /* Quad SPI */ 1529 SNOR_CMD_PP_1_1_4, 1530 SNOR_CMD_PP_1_4_4, 1531 SNOR_CMD_PP_4_4_4, 1532 1533 /* Octo SPI */ 1534 SNOR_CMD_PP_1_1_8, 1535 SNOR_CMD_PP_1_8_8, 1536 SNOR_CMD_PP_8_8_8, 1537 1538 SNOR_CMD_PP_MAX 1539 }; 1540 1541 struct spi_nor_flash_parameter { 1542 u64 size; 1543 u32 page_size; 1544 1545 struct spi_nor_hwcaps hwcaps; 1546 struct spi_nor_read_command reads[SNOR_CMD_READ_MAX]; 1547 struct spi_nor_pp_command page_programs[SNOR_CMD_PP_MAX]; 1548 1549 int (*quad_enable)(struct spi_nor *nor); 1550 }; 1551 1552 static void 1553 spi_nor_set_read_settings(struct spi_nor_read_command *read, 1554 u8 num_mode_clocks, 1555 u8 num_wait_states, 1556 u8 opcode, 1557 enum spi_nor_protocol proto) 1558 { 1559 read->num_mode_clocks = num_mode_clocks; 1560 read->num_wait_states = num_wait_states; 1561 read->opcode = opcode; 1562 read->proto = proto; 1563 } 1564 1565 static void 1566 spi_nor_set_pp_settings(struct spi_nor_pp_command *pp, 1567 u8 opcode, 1568 enum spi_nor_protocol proto) 1569 { 1570 pp->opcode = opcode; 1571 pp->proto = proto; 1572 } 1573 1574 #if CONFIG_IS_ENABLED(SPI_FLASH_SFDP_SUPPORT) 1575 /* 1576 * Serial Flash Discoverable Parameters (SFDP) parsing. 1577 */ 1578 1579 /** 1580 * spi_nor_read_sfdp() - read Serial Flash Discoverable Parameters. 1581 * @nor: pointer to a 'struct spi_nor' 1582 * @addr: offset in the SFDP area to start reading data from 1583 * @len: number of bytes to read 1584 * @buf: buffer where the SFDP data are copied into (dma-safe memory) 1585 * 1586 * Whatever the actual numbers of bytes for address and dummy cycles are 1587 * for (Fast) Read commands, the Read SFDP (5Ah) instruction is always 1588 * followed by a 3-byte address and 8 dummy clock cycles. 1589 * 1590 * Return: 0 on success, -errno otherwise. 1591 */ 1592 static int spi_nor_read_sfdp(struct spi_nor *nor, u32 addr, 1593 size_t len, void *buf) 1594 { 1595 u8 addr_width, read_opcode, read_dummy; 1596 int ret; 1597 1598 read_opcode = nor->read_opcode; 1599 addr_width = nor->addr_width; 1600 read_dummy = nor->read_dummy; 1601 1602 nor->read_opcode = SPINOR_OP_RDSFDP; 1603 nor->addr_width = 3; 1604 nor->read_dummy = 8; 1605 1606 while (len) { 1607 ret = nor->read(nor, addr, len, (u8 *)buf); 1608 if (!ret || ret > len) { 1609 ret = -EIO; 1610 goto read_err; 1611 } 1612 if (ret < 0) 1613 goto read_err; 1614 1615 buf += ret; 1616 addr += ret; 1617 len -= ret; 1618 } 1619 ret = 0; 1620 1621 read_err: 1622 nor->read_opcode = read_opcode; 1623 nor->addr_width = addr_width; 1624 nor->read_dummy = read_dummy; 1625 1626 return ret; 1627 } 1628 1629 struct sfdp_parameter_header { 1630 u8 id_lsb; 1631 u8 minor; 1632 u8 major; 1633 u8 length; /* in double words */ 1634 u8 parameter_table_pointer[3]; /* byte address */ 1635 u8 id_msb; 1636 }; 1637 1638 #define SFDP_PARAM_HEADER_ID(p) (((p)->id_msb << 8) | (p)->id_lsb) 1639 #define SFDP_PARAM_HEADER_PTP(p) \ 1640 (((p)->parameter_table_pointer[2] << 16) | \ 1641 ((p)->parameter_table_pointer[1] << 8) | \ 1642 ((p)->parameter_table_pointer[0] << 0)) 1643 1644 #define SFDP_BFPT_ID 0xff00 /* Basic Flash Parameter Table */ 1645 #define SFDP_SECTOR_MAP_ID 0xff81 /* Sector Map Table */ 1646 1647 #define SFDP_SIGNATURE 0x50444653U 1648 #define SFDP_JESD216_MAJOR 1 1649 #define SFDP_JESD216_MINOR 0 1650 #define SFDP_JESD216A_MINOR 5 1651 #define SFDP_JESD216B_MINOR 6 1652 1653 struct sfdp_header { 1654 u32 signature; /* Ox50444653U <=> "SFDP" */ 1655 u8 minor; 1656 u8 major; 1657 u8 nph; /* 0-base number of parameter headers */ 1658 u8 unused; 1659 1660 /* Basic Flash Parameter Table. */ 1661 struct sfdp_parameter_header bfpt_header; 1662 }; 1663 1664 /* Basic Flash Parameter Table */ 1665 1666 /* 1667 * JESD216 rev B defines a Basic Flash Parameter Table of 16 DWORDs. 1668 * They are indexed from 1 but C arrays are indexed from 0. 1669 */ 1670 #define BFPT_DWORD(i) ((i) - 1) 1671 #define BFPT_DWORD_MAX 16 1672 1673 /* The first version of JESB216 defined only 9 DWORDs. */ 1674 #define BFPT_DWORD_MAX_JESD216 9 1675 1676 /* 1st DWORD. */ 1677 #define BFPT_DWORD1_FAST_READ_1_1_2 BIT(16) 1678 #define BFPT_DWORD1_ADDRESS_BYTES_MASK GENMASK(18, 17) 1679 #define BFPT_DWORD1_ADDRESS_BYTES_3_ONLY (0x0UL << 17) 1680 #define BFPT_DWORD1_ADDRESS_BYTES_3_OR_4 (0x1UL << 17) 1681 #define BFPT_DWORD1_ADDRESS_BYTES_4_ONLY (0x2UL << 17) 1682 #define BFPT_DWORD1_DTR BIT(19) 1683 #define BFPT_DWORD1_FAST_READ_1_2_2 BIT(20) 1684 #define BFPT_DWORD1_FAST_READ_1_4_4 BIT(21) 1685 #define BFPT_DWORD1_FAST_READ_1_1_4 BIT(22) 1686 1687 /* 5th DWORD. */ 1688 #define BFPT_DWORD5_FAST_READ_2_2_2 BIT(0) 1689 #define BFPT_DWORD5_FAST_READ_4_4_4 BIT(4) 1690 1691 /* 11th DWORD. */ 1692 #define BFPT_DWORD11_PAGE_SIZE_SHIFT 4 1693 #define BFPT_DWORD11_PAGE_SIZE_MASK GENMASK(7, 4) 1694 1695 /* 15th DWORD. */ 1696 1697 /* 1698 * (from JESD216 rev B) 1699 * Quad Enable Requirements (QER): 1700 * - 000b: Device does not have a QE bit. Device detects 1-1-4 and 1-4-4 1701 * reads based on instruction. DQ3/HOLD# functions are hold during 1702 * instruction phase. 1703 * - 001b: QE is bit 1 of status register 2. It is set via Write Status with 1704 * two data bytes where bit 1 of the second byte is one. 1705 * [...] 1706 * Writing only one byte to the status register has the side-effect of 1707 * clearing status register 2, including the QE bit. The 100b code is 1708 * used if writing one byte to the status register does not modify 1709 * status register 2. 1710 * - 010b: QE is bit 6 of status register 1. It is set via Write Status with 1711 * one data byte where bit 6 is one. 1712 * [...] 1713 * - 011b: QE is bit 7 of status register 2. It is set via Write status 1714 * register 2 instruction 3Eh with one data byte where bit 7 is one. 1715 * [...] 1716 * The status register 2 is read using instruction 3Fh. 1717 * - 100b: QE is bit 1 of status register 2. It is set via Write Status with 1718 * two data bytes where bit 1 of the second byte is one. 1719 * [...] 1720 * In contrast to the 001b code, writing one byte to the status 1721 * register does not modify status register 2. 1722 * - 101b: QE is bit 1 of status register 2. Status register 1 is read using 1723 * Read Status instruction 05h. Status register2 is read using 1724 * instruction 35h. QE is set via Writ Status instruction 01h with 1725 * two data bytes where bit 1 of the second byte is one. 1726 * [...] 1727 */ 1728 #define BFPT_DWORD15_QER_MASK GENMASK(22, 20) 1729 #define BFPT_DWORD15_QER_NONE (0x0UL << 20) /* Micron */ 1730 #define BFPT_DWORD15_QER_SR2_BIT1_BUGGY (0x1UL << 20) 1731 #define BFPT_DWORD15_QER_SR1_BIT6 (0x2UL << 20) /* Macronix */ 1732 #define BFPT_DWORD15_QER_SR2_BIT7 (0x3UL << 20) 1733 #define BFPT_DWORD15_QER_SR2_BIT1_NO_RD (0x4UL << 20) 1734 #define BFPT_DWORD15_QER_SR2_BIT1 (0x5UL << 20) /* Spansion */ 1735 1736 struct sfdp_bfpt { 1737 u32 dwords[BFPT_DWORD_MAX]; 1738 }; 1739 1740 /* Fast Read settings. */ 1741 1742 static void 1743 spi_nor_set_read_settings_from_bfpt(struct spi_nor_read_command *read, 1744 u16 half, 1745 enum spi_nor_protocol proto) 1746 { 1747 read->num_mode_clocks = (half >> 5) & 0x07; 1748 read->num_wait_states = (half >> 0) & 0x1f; 1749 read->opcode = (half >> 8) & 0xff; 1750 read->proto = proto; 1751 } 1752 1753 struct sfdp_bfpt_read { 1754 /* The Fast Read x-y-z hardware capability in params->hwcaps.mask. */ 1755 u32 hwcaps; 1756 1757 /* 1758 * The <supported_bit> bit in <supported_dword> BFPT DWORD tells us 1759 * whether the Fast Read x-y-z command is supported. 1760 */ 1761 u32 supported_dword; 1762 u32 supported_bit; 1763 1764 /* 1765 * The half-word at offset <setting_shift> in <setting_dword> BFPT DWORD 1766 * encodes the op code, the number of mode clocks and the number of wait 1767 * states to be used by Fast Read x-y-z command. 1768 */ 1769 u32 settings_dword; 1770 u32 settings_shift; 1771 1772 /* The SPI protocol for this Fast Read x-y-z command. */ 1773 enum spi_nor_protocol proto; 1774 }; 1775 1776 static const struct sfdp_bfpt_read sfdp_bfpt_reads[] = { 1777 /* Fast Read 1-1-2 */ 1778 { 1779 SNOR_HWCAPS_READ_1_1_2, 1780 BFPT_DWORD(1), BIT(16), /* Supported bit */ 1781 BFPT_DWORD(4), 0, /* Settings */ 1782 SNOR_PROTO_1_1_2, 1783 }, 1784 1785 /* Fast Read 1-2-2 */ 1786 { 1787 SNOR_HWCAPS_READ_1_2_2, 1788 BFPT_DWORD(1), BIT(20), /* Supported bit */ 1789 BFPT_DWORD(4), 16, /* Settings */ 1790 SNOR_PROTO_1_2_2, 1791 }, 1792 1793 /* Fast Read 2-2-2 */ 1794 { 1795 SNOR_HWCAPS_READ_2_2_2, 1796 BFPT_DWORD(5), BIT(0), /* Supported bit */ 1797 BFPT_DWORD(6), 16, /* Settings */ 1798 SNOR_PROTO_2_2_2, 1799 }, 1800 1801 /* Fast Read 1-1-4 */ 1802 { 1803 SNOR_HWCAPS_READ_1_1_4, 1804 BFPT_DWORD(1), BIT(22), /* Supported bit */ 1805 BFPT_DWORD(3), 16, /* Settings */ 1806 SNOR_PROTO_1_1_4, 1807 }, 1808 1809 /* Fast Read 1-4-4 */ 1810 { 1811 SNOR_HWCAPS_READ_1_4_4, 1812 BFPT_DWORD(1), BIT(21), /* Supported bit */ 1813 BFPT_DWORD(3), 0, /* Settings */ 1814 SNOR_PROTO_1_4_4, 1815 }, 1816 1817 /* Fast Read 4-4-4 */ 1818 { 1819 SNOR_HWCAPS_READ_4_4_4, 1820 BFPT_DWORD(5), BIT(4), /* Supported bit */ 1821 BFPT_DWORD(7), 16, /* Settings */ 1822 SNOR_PROTO_4_4_4, 1823 }, 1824 }; 1825 1826 struct sfdp_bfpt_erase { 1827 /* 1828 * The half-word at offset <shift> in DWORD <dwoard> encodes the 1829 * op code and erase sector size to be used by Sector Erase commands. 1830 */ 1831 u32 dword; 1832 u32 shift; 1833 }; 1834 1835 static const struct sfdp_bfpt_erase sfdp_bfpt_erases[] = { 1836 /* Erase Type 1 in DWORD8 bits[15:0] */ 1837 {BFPT_DWORD(8), 0}, 1838 1839 /* Erase Type 2 in DWORD8 bits[31:16] */ 1840 {BFPT_DWORD(8), 16}, 1841 1842 /* Erase Type 3 in DWORD9 bits[15:0] */ 1843 {BFPT_DWORD(9), 0}, 1844 1845 /* Erase Type 4 in DWORD9 bits[31:16] */ 1846 {BFPT_DWORD(9), 16}, 1847 }; 1848 1849 static int spi_nor_hwcaps_read2cmd(u32 hwcaps); 1850 1851 /** 1852 * spi_nor_parse_bfpt() - read and parse the Basic Flash Parameter Table. 1853 * @nor: pointer to a 'struct spi_nor' 1854 * @bfpt_header: pointer to the 'struct sfdp_parameter_header' describing 1855 * the Basic Flash Parameter Table length and version 1856 * @params: pointer to the 'struct spi_nor_flash_parameter' to be 1857 * filled 1858 * 1859 * The Basic Flash Parameter Table is the main and only mandatory table as 1860 * defined by the SFDP (JESD216) specification. 1861 * It provides us with the total size (memory density) of the data array and 1862 * the number of address bytes for Fast Read, Page Program and Sector Erase 1863 * commands. 1864 * For Fast READ commands, it also gives the number of mode clock cycles and 1865 * wait states (regrouped in the number of dummy clock cycles) for each 1866 * supported instruction op code. 1867 * For Page Program, the page size is now available since JESD216 rev A, however 1868 * the supported instruction op codes are still not provided. 1869 * For Sector Erase commands, this table stores the supported instruction op 1870 * codes and the associated sector sizes. 1871 * Finally, the Quad Enable Requirements (QER) are also available since JESD216 1872 * rev A. The QER bits encode the manufacturer dependent procedure to be 1873 * executed to set the Quad Enable (QE) bit in some internal register of the 1874 * Quad SPI memory. Indeed the QE bit, when it exists, must be set before 1875 * sending any Quad SPI command to the memory. Actually, setting the QE bit 1876 * tells the memory to reassign its WP# and HOLD#/RESET# pins to functions IO2 1877 * and IO3 hence enabling 4 (Quad) I/O lines. 1878 * 1879 * Return: 0 on success, -errno otherwise. 1880 */ 1881 static int spi_nor_parse_bfpt(struct spi_nor *nor, 1882 const struct sfdp_parameter_header *bfpt_header, 1883 struct spi_nor_flash_parameter *params) 1884 { 1885 struct mtd_info *mtd = &nor->mtd; 1886 struct sfdp_bfpt bfpt; 1887 size_t len; 1888 int i, cmd, err; 1889 u32 addr; 1890 u16 half; 1891 1892 /* JESD216 Basic Flash Parameter Table length is at least 9 DWORDs. */ 1893 if (bfpt_header->length < BFPT_DWORD_MAX_JESD216) 1894 return -EINVAL; 1895 1896 /* Read the Basic Flash Parameter Table. */ 1897 len = min_t(size_t, sizeof(bfpt), 1898 bfpt_header->length * sizeof(u32)); 1899 addr = SFDP_PARAM_HEADER_PTP(bfpt_header); 1900 memset(&bfpt, 0, sizeof(bfpt)); 1901 err = spi_nor_read_sfdp(nor, addr, len, &bfpt); 1902 if (err < 0) 1903 return err; 1904 1905 /* Fix endianness of the BFPT DWORDs. */ 1906 for (i = 0; i < BFPT_DWORD_MAX; i++) 1907 bfpt.dwords[i] = le32_to_cpu(bfpt.dwords[i]); 1908 1909 /* Number of address bytes. */ 1910 switch (bfpt.dwords[BFPT_DWORD(1)] & BFPT_DWORD1_ADDRESS_BYTES_MASK) { 1911 case BFPT_DWORD1_ADDRESS_BYTES_3_ONLY: 1912 nor->addr_width = 3; 1913 break; 1914 1915 case BFPT_DWORD1_ADDRESS_BYTES_4_ONLY: 1916 nor->addr_width = 4; 1917 break; 1918 1919 default: 1920 break; 1921 } 1922 1923 /* Flash Memory Density (in bits). */ 1924 params->size = bfpt.dwords[BFPT_DWORD(2)]; 1925 if (params->size & BIT(31)) { 1926 params->size &= ~BIT(31); 1927 1928 /* 1929 * Prevent overflows on params->size. Anyway, a NOR of 2^64 1930 * bits is unlikely to exist so this error probably means 1931 * the BFPT we are reading is corrupted/wrong. 1932 */ 1933 if (params->size > 63) 1934 return -EINVAL; 1935 1936 params->size = 1ULL << params->size; 1937 } else { 1938 params->size++; 1939 } 1940 params->size >>= 3; /* Convert to bytes. */ 1941 1942 /* Fast Read settings. */ 1943 for (i = 0; i < ARRAY_SIZE(sfdp_bfpt_reads); i++) { 1944 const struct sfdp_bfpt_read *rd = &sfdp_bfpt_reads[i]; 1945 struct spi_nor_read_command *read; 1946 1947 if (!(bfpt.dwords[rd->supported_dword] & rd->supported_bit)) { 1948 params->hwcaps.mask &= ~rd->hwcaps; 1949 continue; 1950 } 1951 1952 params->hwcaps.mask |= rd->hwcaps; 1953 cmd = spi_nor_hwcaps_read2cmd(rd->hwcaps); 1954 read = ¶ms->reads[cmd]; 1955 half = bfpt.dwords[rd->settings_dword] >> rd->settings_shift; 1956 spi_nor_set_read_settings_from_bfpt(read, half, rd->proto); 1957 } 1958 1959 /* Sector Erase settings. */ 1960 for (i = 0; i < ARRAY_SIZE(sfdp_bfpt_erases); i++) { 1961 const struct sfdp_bfpt_erase *er = &sfdp_bfpt_erases[i]; 1962 u32 erasesize; 1963 u8 opcode; 1964 1965 half = bfpt.dwords[er->dword] >> er->shift; 1966 erasesize = half & 0xff; 1967 1968 /* erasesize == 0 means this Erase Type is not supported. */ 1969 if (!erasesize) 1970 continue; 1971 1972 erasesize = 1U << erasesize; 1973 opcode = (half >> 8) & 0xff; 1974 #ifdef CONFIG_SPI_FLASH_USE_4K_SECTORS 1975 if (erasesize == SZ_4K) { 1976 nor->erase_opcode = opcode; 1977 mtd->erasesize = erasesize; 1978 break; 1979 } 1980 #endif 1981 if (!mtd->erasesize || mtd->erasesize < erasesize) { 1982 nor->erase_opcode = opcode; 1983 mtd->erasesize = erasesize; 1984 } 1985 } 1986 1987 /* Stop here if not JESD216 rev A or later. */ 1988 if (bfpt_header->length < BFPT_DWORD_MAX) 1989 return 0; 1990 1991 /* Page size: this field specifies 'N' so the page size = 2^N bytes. */ 1992 params->page_size = bfpt.dwords[BFPT_DWORD(11)]; 1993 params->page_size &= BFPT_DWORD11_PAGE_SIZE_MASK; 1994 params->page_size >>= BFPT_DWORD11_PAGE_SIZE_SHIFT; 1995 params->page_size = 1U << params->page_size; 1996 1997 /* Quad Enable Requirements. */ 1998 switch (bfpt.dwords[BFPT_DWORD(15)] & BFPT_DWORD15_QER_MASK) { 1999 case BFPT_DWORD15_QER_NONE: 2000 params->quad_enable = NULL; 2001 break; 2002 #if defined(CONFIG_SPI_FLASH_SPANSION) || defined(CONFIG_SPI_FLASH_WINBOND) 2003 case BFPT_DWORD15_QER_SR2_BIT1_BUGGY: 2004 case BFPT_DWORD15_QER_SR2_BIT1_NO_RD: 2005 params->quad_enable = spansion_no_read_cr_quad_enable; 2006 break; 2007 #endif 2008 #ifdef CONFIG_SPI_FLASH_MACRONIX 2009 case BFPT_DWORD15_QER_SR1_BIT6: 2010 params->quad_enable = macronix_quad_enable; 2011 break; 2012 #endif 2013 #if defined(CONFIG_SPI_FLASH_SPANSION) || defined(CONFIG_SPI_FLASH_WINBOND) 2014 case BFPT_DWORD15_QER_SR2_BIT1: 2015 params->quad_enable = spansion_read_cr_quad_enable; 2016 break; 2017 #endif 2018 default: 2019 return -EINVAL; 2020 } 2021 2022 return 0; 2023 } 2024 2025 /** 2026 * spi_nor_parse_sfdp() - parse the Serial Flash Discoverable Parameters. 2027 * @nor: pointer to a 'struct spi_nor' 2028 * @params: pointer to the 'struct spi_nor_flash_parameter' to be 2029 * filled 2030 * 2031 * The Serial Flash Discoverable Parameters are described by the JEDEC JESD216 2032 * specification. This is a standard which tends to supported by almost all 2033 * (Q)SPI memory manufacturers. Those hard-coded tables allow us to learn at 2034 * runtime the main parameters needed to perform basic SPI flash operations such 2035 * as Fast Read, Page Program or Sector Erase commands. 2036 * 2037 * Return: 0 on success, -errno otherwise. 2038 */ 2039 static int spi_nor_parse_sfdp(struct spi_nor *nor, 2040 struct spi_nor_flash_parameter *params) 2041 { 2042 const struct sfdp_parameter_header *param_header, *bfpt_header; 2043 struct sfdp_parameter_header *param_headers = NULL; 2044 struct sfdp_header header; 2045 size_t psize; 2046 int i, err; 2047 2048 /* Get the SFDP header. */ 2049 err = spi_nor_read_sfdp(nor, 0, sizeof(header), &header); 2050 if (err < 0) 2051 return err; 2052 2053 /* Check the SFDP header version. */ 2054 if (le32_to_cpu(header.signature) != SFDP_SIGNATURE || 2055 header.major != SFDP_JESD216_MAJOR) 2056 return -EINVAL; 2057 2058 /* 2059 * Verify that the first and only mandatory parameter header is a 2060 * Basic Flash Parameter Table header as specified in JESD216. 2061 */ 2062 bfpt_header = &header.bfpt_header; 2063 if (SFDP_PARAM_HEADER_ID(bfpt_header) != SFDP_BFPT_ID || 2064 bfpt_header->major != SFDP_JESD216_MAJOR) 2065 return -EINVAL; 2066 2067 /* 2068 * Allocate memory then read all parameter headers with a single 2069 * Read SFDP command. These parameter headers will actually be parsed 2070 * twice: a first time to get the latest revision of the basic flash 2071 * parameter table, then a second time to handle the supported optional 2072 * tables. 2073 * Hence we read the parameter headers once for all to reduce the 2074 * processing time. Also we use kmalloc() instead of devm_kmalloc() 2075 * because we don't need to keep these parameter headers: the allocated 2076 * memory is always released with kfree() before exiting this function. 2077 */ 2078 if (header.nph) { 2079 psize = header.nph * sizeof(*param_headers); 2080 2081 param_headers = kmalloc(psize, GFP_KERNEL); 2082 if (!param_headers) 2083 return -ENOMEM; 2084 2085 err = spi_nor_read_sfdp(nor, sizeof(header), 2086 psize, param_headers); 2087 if (err < 0) { 2088 dev_err(dev, "failed to read SFDP parameter headers\n"); 2089 goto exit; 2090 } 2091 } 2092 2093 /* 2094 * Check other parameter headers to get the latest revision of 2095 * the basic flash parameter table. 2096 */ 2097 for (i = 0; i < header.nph; i++) { 2098 param_header = ¶m_headers[i]; 2099 2100 if (SFDP_PARAM_HEADER_ID(param_header) == SFDP_BFPT_ID && 2101 param_header->major == SFDP_JESD216_MAJOR && 2102 (param_header->minor > bfpt_header->minor || 2103 (param_header->minor == bfpt_header->minor && 2104 param_header->length > bfpt_header->length))) 2105 bfpt_header = param_header; 2106 } 2107 2108 err = spi_nor_parse_bfpt(nor, bfpt_header, params); 2109 if (err) 2110 goto exit; 2111 2112 /* Parse other parameter headers. */ 2113 for (i = 0; i < header.nph; i++) { 2114 param_header = ¶m_headers[i]; 2115 2116 switch (SFDP_PARAM_HEADER_ID(param_header)) { 2117 case SFDP_SECTOR_MAP_ID: 2118 dev_info(dev, "non-uniform erase sector maps are not supported yet.\n"); 2119 break; 2120 2121 default: 2122 break; 2123 } 2124 2125 if (err) 2126 goto exit; 2127 } 2128 2129 exit: 2130 kfree(param_headers); 2131 return err; 2132 } 2133 #else 2134 static int spi_nor_parse_sfdp(struct spi_nor *nor, 2135 struct spi_nor_flash_parameter *params) 2136 { 2137 return -EINVAL; 2138 } 2139 #endif /* SPI_FLASH_SFDP_SUPPORT */ 2140 2141 static int spi_nor_init_params(struct spi_nor *nor, 2142 const struct flash_info *info, 2143 struct spi_nor_flash_parameter *params) 2144 { 2145 /* Set legacy flash parameters as default. */ 2146 memset(params, 0, sizeof(*params)); 2147 2148 /* Set SPI NOR sizes. */ 2149 params->size = info->sector_size * info->n_sectors; 2150 params->page_size = info->page_size; 2151 2152 /* (Fast) Read settings. */ 2153 params->hwcaps.mask |= SNOR_HWCAPS_READ; 2154 spi_nor_set_read_settings(¶ms->reads[SNOR_CMD_READ], 2155 0, 0, SPINOR_OP_READ, 2156 SNOR_PROTO_1_1_1); 2157 2158 if (!(info->flags & SPI_NOR_NO_FR)) { 2159 params->hwcaps.mask |= SNOR_HWCAPS_READ_FAST; 2160 spi_nor_set_read_settings(¶ms->reads[SNOR_CMD_READ_FAST], 2161 0, 8, SPINOR_OP_READ_FAST, 2162 SNOR_PROTO_1_1_1); 2163 } 2164 2165 if (info->flags & SPI_NOR_DUAL_READ) { 2166 params->hwcaps.mask |= SNOR_HWCAPS_READ_1_1_2; 2167 spi_nor_set_read_settings(¶ms->reads[SNOR_CMD_READ_1_1_2], 2168 0, 8, SPINOR_OP_READ_1_1_2, 2169 SNOR_PROTO_1_1_2); 2170 } 2171 2172 if (info->flags & SPI_NOR_QUAD_READ) { 2173 params->hwcaps.mask |= SNOR_HWCAPS_READ_1_1_4; 2174 spi_nor_set_read_settings(¶ms->reads[SNOR_CMD_READ_1_1_4], 2175 0, 8, SPINOR_OP_READ_1_1_4, 2176 SNOR_PROTO_1_1_4); 2177 } 2178 2179 if (info->flags & SPI_NOR_OCTAL_READ) { 2180 params->hwcaps.mask |= SNOR_HWCAPS_READ_1_1_8; 2181 spi_nor_set_read_settings(¶ms->reads[SNOR_CMD_READ_1_1_8], 2182 0, 8, SPINOR_OP_READ_1_1_8, 2183 SNOR_PROTO_1_1_8); 2184 } 2185 2186 /* Page Program settings. */ 2187 params->hwcaps.mask |= SNOR_HWCAPS_PP; 2188 spi_nor_set_pp_settings(¶ms->page_programs[SNOR_CMD_PP], 2189 SPINOR_OP_PP, SNOR_PROTO_1_1_1); 2190 2191 if (info->flags & SPI_NOR_QUAD_READ) { 2192 params->hwcaps.mask |= SNOR_HWCAPS_PP_1_1_4; 2193 spi_nor_set_pp_settings(¶ms->page_programs[SNOR_CMD_PP_1_1_4], 2194 SPINOR_OP_PP_1_1_4, SNOR_PROTO_1_1_4); 2195 } 2196 2197 /* Select the procedure to set the Quad Enable bit. */ 2198 if (params->hwcaps.mask & (SNOR_HWCAPS_READ_QUAD | 2199 SNOR_HWCAPS_PP_QUAD)) { 2200 switch (JEDEC_MFR(info)) { 2201 #ifdef CONFIG_SPI_FLASH_MACRONIX 2202 case SNOR_MFR_MACRONIX: 2203 params->quad_enable = macronix_quad_enable; 2204 break; 2205 #endif 2206 case SNOR_MFR_ST: 2207 case SNOR_MFR_MICRON: 2208 break; 2209 #ifdef CONFIG_SPI_FLASH_NORMEM 2210 case SNOR_MFR_NORMEM: 2211 params->quad_enable = normem_quad_enable; 2212 break; 2213 #endif 2214 default: 2215 #if defined(CONFIG_SPI_FLASH_SPANSION) || defined(CONFIG_SPI_FLASH_WINBOND) 2216 /* Kept only for backward compatibility purpose. */ 2217 params->quad_enable = spansion_read_cr_quad_enable; 2218 #endif 2219 break; 2220 } 2221 } 2222 2223 /* Override the parameters with data read from SFDP tables. */ 2224 nor->addr_width = 0; 2225 nor->mtd.erasesize = 0; 2226 if ((info->flags & (SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ)) && 2227 !(info->flags & SPI_NOR_SKIP_SFDP)) { 2228 struct spi_nor_flash_parameter sfdp_params; 2229 2230 memcpy(&sfdp_params, params, sizeof(sfdp_params)); 2231 if (spi_nor_parse_sfdp(nor, &sfdp_params)) { 2232 nor->addr_width = 0; 2233 nor->mtd.erasesize = 0; 2234 } else { 2235 memcpy(params, &sfdp_params, sizeof(*params)); 2236 } 2237 } 2238 2239 return 0; 2240 } 2241 2242 static int spi_nor_hwcaps2cmd(u32 hwcaps, const int table[][2], size_t size) 2243 { 2244 size_t i; 2245 2246 for (i = 0; i < size; i++) 2247 if (table[i][0] == (int)hwcaps) 2248 return table[i][1]; 2249 2250 return -EINVAL; 2251 } 2252 2253 static int spi_nor_hwcaps_read2cmd(u32 hwcaps) 2254 { 2255 static const int hwcaps_read2cmd[][2] = { 2256 { SNOR_HWCAPS_READ, SNOR_CMD_READ }, 2257 { SNOR_HWCAPS_READ_FAST, SNOR_CMD_READ_FAST }, 2258 { SNOR_HWCAPS_READ_1_1_1_DTR, SNOR_CMD_READ_1_1_1_DTR }, 2259 { SNOR_HWCAPS_READ_1_1_2, SNOR_CMD_READ_1_1_2 }, 2260 { SNOR_HWCAPS_READ_1_2_2, SNOR_CMD_READ_1_2_2 }, 2261 { SNOR_HWCAPS_READ_2_2_2, SNOR_CMD_READ_2_2_2 }, 2262 { SNOR_HWCAPS_READ_1_2_2_DTR, SNOR_CMD_READ_1_2_2_DTR }, 2263 { SNOR_HWCAPS_READ_1_1_4, SNOR_CMD_READ_1_1_4 }, 2264 { SNOR_HWCAPS_READ_1_4_4, SNOR_CMD_READ_1_4_4 }, 2265 { SNOR_HWCAPS_READ_4_4_4, SNOR_CMD_READ_4_4_4 }, 2266 { SNOR_HWCAPS_READ_1_4_4_DTR, SNOR_CMD_READ_1_4_4_DTR }, 2267 { SNOR_HWCAPS_READ_1_1_8, SNOR_CMD_READ_1_1_8 }, 2268 { SNOR_HWCAPS_READ_1_8_8, SNOR_CMD_READ_1_8_8 }, 2269 { SNOR_HWCAPS_READ_8_8_8, SNOR_CMD_READ_8_8_8 }, 2270 { SNOR_HWCAPS_READ_1_8_8_DTR, SNOR_CMD_READ_1_8_8_DTR }, 2271 }; 2272 2273 return spi_nor_hwcaps2cmd(hwcaps, hwcaps_read2cmd, 2274 ARRAY_SIZE(hwcaps_read2cmd)); 2275 } 2276 2277 static int spi_nor_hwcaps_pp2cmd(u32 hwcaps) 2278 { 2279 static const int hwcaps_pp2cmd[][2] = { 2280 { SNOR_HWCAPS_PP, SNOR_CMD_PP }, 2281 { SNOR_HWCAPS_PP_1_1_4, SNOR_CMD_PP_1_1_4 }, 2282 { SNOR_HWCAPS_PP_1_4_4, SNOR_CMD_PP_1_4_4 }, 2283 { SNOR_HWCAPS_PP_4_4_4, SNOR_CMD_PP_4_4_4 }, 2284 { SNOR_HWCAPS_PP_1_1_8, SNOR_CMD_PP_1_1_8 }, 2285 { SNOR_HWCAPS_PP_1_8_8, SNOR_CMD_PP_1_8_8 }, 2286 { SNOR_HWCAPS_PP_8_8_8, SNOR_CMD_PP_8_8_8 }, 2287 }; 2288 2289 return spi_nor_hwcaps2cmd(hwcaps, hwcaps_pp2cmd, 2290 ARRAY_SIZE(hwcaps_pp2cmd)); 2291 } 2292 2293 static int spi_nor_select_read(struct spi_nor *nor, 2294 const struct spi_nor_flash_parameter *params, 2295 u32 shared_hwcaps) 2296 { 2297 int cmd, best_match = fls(shared_hwcaps & SNOR_HWCAPS_READ_MASK) - 1; 2298 const struct spi_nor_read_command *read; 2299 2300 if (best_match < 0) 2301 return -EINVAL; 2302 2303 cmd = spi_nor_hwcaps_read2cmd(BIT(best_match)); 2304 if (cmd < 0) 2305 return -EINVAL; 2306 2307 read = ¶ms->reads[cmd]; 2308 nor->read_opcode = read->opcode; 2309 nor->read_proto = read->proto; 2310 2311 /* 2312 * In the spi-nor framework, we don't need to make the difference 2313 * between mode clock cycles and wait state clock cycles. 2314 * Indeed, the value of the mode clock cycles is used by a QSPI 2315 * flash memory to know whether it should enter or leave its 0-4-4 2316 * (Continuous Read / XIP) mode. 2317 * eXecution In Place is out of the scope of the mtd sub-system. 2318 * Hence we choose to merge both mode and wait state clock cycles 2319 * into the so called dummy clock cycles. 2320 */ 2321 nor->read_dummy = read->num_mode_clocks + read->num_wait_states; 2322 return 0; 2323 } 2324 2325 static int spi_nor_select_pp(struct spi_nor *nor, 2326 const struct spi_nor_flash_parameter *params, 2327 u32 shared_hwcaps) 2328 { 2329 int cmd, best_match = fls(shared_hwcaps & SNOR_HWCAPS_PP_MASK) - 1; 2330 const struct spi_nor_pp_command *pp; 2331 2332 if (best_match < 0) 2333 return -EINVAL; 2334 2335 cmd = spi_nor_hwcaps_pp2cmd(BIT(best_match)); 2336 if (cmd < 0) 2337 return -EINVAL; 2338 2339 pp = ¶ms->page_programs[cmd]; 2340 nor->program_opcode = pp->opcode; 2341 nor->write_proto = pp->proto; 2342 return 0; 2343 } 2344 2345 static int spi_nor_select_erase(struct spi_nor *nor, 2346 const struct flash_info *info) 2347 { 2348 struct mtd_info *mtd = &nor->mtd; 2349 2350 /* Do nothing if already configured from SFDP. */ 2351 if (mtd->erasesize) 2352 return 0; 2353 2354 #ifdef CONFIG_SPI_FLASH_USE_4K_SECTORS 2355 /* prefer "small sector" erase if possible */ 2356 if (info->flags & SECT_4K) { 2357 nor->erase_opcode = SPINOR_OP_BE_4K; 2358 mtd->erasesize = 4096; 2359 } else if (info->flags & SECT_4K_PMC) { 2360 nor->erase_opcode = SPINOR_OP_BE_4K_PMC; 2361 mtd->erasesize = 4096; 2362 } else 2363 #endif 2364 { 2365 nor->erase_opcode = SPINOR_OP_SE; 2366 mtd->erasesize = info->sector_size; 2367 } 2368 return 0; 2369 } 2370 2371 static int spi_nor_setup(struct spi_nor *nor, const struct flash_info *info, 2372 const struct spi_nor_flash_parameter *params, 2373 const struct spi_nor_hwcaps *hwcaps) 2374 { 2375 u32 ignored_mask, shared_mask; 2376 bool enable_quad_io; 2377 int err; 2378 2379 /* 2380 * Keep only the hardware capabilities supported by both the SPI 2381 * controller and the SPI flash memory. 2382 */ 2383 shared_mask = hwcaps->mask & params->hwcaps.mask; 2384 2385 /* SPI n-n-n protocols are not supported yet. */ 2386 ignored_mask = (SNOR_HWCAPS_READ_2_2_2 | 2387 SNOR_HWCAPS_READ_4_4_4 | 2388 SNOR_HWCAPS_READ_8_8_8 | 2389 SNOR_HWCAPS_PP_4_4_4 | 2390 SNOR_HWCAPS_PP_8_8_8); 2391 if (shared_mask & ignored_mask) { 2392 dev_dbg(nor->dev, 2393 "SPI n-n-n protocols are not supported yet.\n"); 2394 shared_mask &= ~ignored_mask; 2395 } 2396 2397 /* Select the (Fast) Read command. */ 2398 err = spi_nor_select_read(nor, params, shared_mask); 2399 if (err) { 2400 dev_dbg(nor->dev, 2401 "can't select read settings supported by both the SPI controller and memory.\n"); 2402 return err; 2403 } 2404 2405 /* Select the Page Program command. */ 2406 err = spi_nor_select_pp(nor, params, shared_mask); 2407 if (err) { 2408 dev_dbg(nor->dev, 2409 "can't select write settings supported by both the SPI controller and memory.\n"); 2410 return err; 2411 } 2412 2413 /* Select the Sector Erase command. */ 2414 err = spi_nor_select_erase(nor, info); 2415 if (err) { 2416 dev_dbg(nor->dev, 2417 "can't select erase settings supported by both the SPI controller and memory.\n"); 2418 return err; 2419 } 2420 2421 /* Enable Quad I/O if needed. */ 2422 enable_quad_io = (spi_nor_get_protocol_width(nor->read_proto) == 4 || 2423 spi_nor_get_protocol_width(nor->write_proto) == 4); 2424 if (enable_quad_io && params->quad_enable) 2425 nor->quad_enable = params->quad_enable; 2426 else 2427 nor->quad_enable = NULL; 2428 2429 return 0; 2430 } 2431 2432 static int spi_nor_init(struct spi_nor *nor) 2433 { 2434 int err; 2435 2436 /* 2437 * Atmel, SST, Intel/Numonyx, and others serial NOR tend to power up 2438 * with the software protection bits set 2439 */ 2440 if (JEDEC_MFR(nor->info) == SNOR_MFR_ATMEL || 2441 JEDEC_MFR(nor->info) == SNOR_MFR_INTEL || 2442 JEDEC_MFR(nor->info) == SNOR_MFR_SST || 2443 nor->info->flags & SPI_NOR_HAS_LOCK) { 2444 write_enable(nor); 2445 write_sr(nor, 0); 2446 spi_nor_wait_till_ready(nor); 2447 } 2448 2449 if (nor->quad_enable) { 2450 err = nor->quad_enable(nor); 2451 if (err) { 2452 dev_dbg(nor->dev, "quad mode not supported\n"); 2453 return err; 2454 } 2455 } 2456 2457 if (nor->addr_width == 4 && 2458 (JEDEC_MFR(nor->info) != SNOR_MFR_SPANSION) && 2459 !(nor->info->flags & SPI_NOR_4B_OPCODES)) { 2460 /* 2461 * If the RESET# pin isn't hooked up properly, or the system 2462 * otherwise doesn't perform a reset command in the boot 2463 * sequence, it's impossible to 100% protect against unexpected 2464 * reboots (e.g., crashes). Warn the user (or hopefully, system 2465 * designer) that this is bad. 2466 */ 2467 if (nor->flags & SNOR_F_BROKEN_RESET) 2468 printf("enabling reset hack; may not recover from unexpected reboots\n"); 2469 set_4byte(nor, nor->info, 1); 2470 } 2471 2472 return 0; 2473 } 2474 2475 int spi_nor_scan(struct spi_nor *nor) 2476 { 2477 struct spi_nor_flash_parameter params; 2478 const struct flash_info *info = NULL; 2479 struct mtd_info *mtd = &nor->mtd; 2480 struct spi_nor_hwcaps hwcaps = { 2481 .mask = SNOR_HWCAPS_READ | 2482 SNOR_HWCAPS_READ_FAST | 2483 SNOR_HWCAPS_PP, 2484 }; 2485 struct spi_slave *spi = nor->spi; 2486 int ret; 2487 2488 /* Reset SPI protocol for all commands. */ 2489 nor->reg_proto = SNOR_PROTO_1_1_1; 2490 nor->read_proto = SNOR_PROTO_1_1_1; 2491 nor->write_proto = SNOR_PROTO_1_1_1; 2492 nor->read = spi_nor_read_data; 2493 nor->write = spi_nor_write_data; 2494 nor->read_reg = spi_nor_read_reg; 2495 nor->write_reg = spi_nor_write_reg; 2496 2497 if (spi->mode & SPI_RX_OCTAL) { 2498 hwcaps.mask |= SNOR_HWCAPS_READ_1_1_8; 2499 2500 if (spi->mode & SPI_TX_OCTAL) 2501 hwcaps.mask |= (SNOR_HWCAPS_READ_1_8_8 | 2502 SNOR_HWCAPS_PP_1_1_8 | 2503 SNOR_HWCAPS_PP_1_8_8); 2504 } else if (spi->mode & SPI_RX_QUAD) { 2505 hwcaps.mask |= SNOR_HWCAPS_READ_1_1_4; 2506 2507 if (spi->mode & SPI_TX_QUAD) 2508 hwcaps.mask |= (SNOR_HWCAPS_READ_1_4_4 | 2509 SNOR_HWCAPS_PP_1_1_4 | 2510 SNOR_HWCAPS_PP_1_4_4); 2511 } else if (spi->mode & SPI_RX_DUAL) { 2512 hwcaps.mask |= SNOR_HWCAPS_READ_1_1_2; 2513 2514 if (spi->mode & SPI_TX_DUAL) 2515 hwcaps.mask |= SNOR_HWCAPS_READ_1_2_2; 2516 } 2517 2518 info = spi_nor_read_id(nor); 2519 if (IS_ERR_OR_NULL(info)) 2520 return -ENOENT; 2521 /* Parse the Serial Flash Discoverable Parameters table. */ 2522 ret = spi_nor_init_params(nor, info, ¶ms); 2523 if (ret) 2524 return ret; 2525 2526 if (!mtd->name) 2527 mtd->name = info->name; 2528 mtd->priv = nor; 2529 mtd->type = MTD_NORFLASH; 2530 mtd->writesize = 1; 2531 mtd->flags = MTD_CAP_NORFLASH; 2532 mtd->size = params.size; 2533 mtd->_erase = spi_nor_erase; 2534 mtd->_read = spi_nor_read; 2535 2536 #if defined(CONFIG_SPI_FLASH_STMICRO) || defined(CONFIG_SPI_FLASH_SST) 2537 /* NOR protection support for STmicro/Micron chips and similar */ 2538 if (JEDEC_MFR(info) == SNOR_MFR_ST || 2539 JEDEC_MFR(info) == SNOR_MFR_MICRON || 2540 JEDEC_MFR(info) == SNOR_MFR_SST || 2541 info->flags & SPI_NOR_HAS_LOCK) { 2542 nor->flash_lock = stm_lock; 2543 nor->flash_unlock = stm_unlock; 2544 nor->flash_is_locked = stm_is_locked; 2545 } 2546 #endif 2547 2548 #ifdef CONFIG_SPI_FLASH_SST 2549 /* 2550 * sst26 series block protection implementation differs from other 2551 * series. 2552 */ 2553 if (info->flags & SPI_NOR_HAS_SST26LOCK) { 2554 nor->flash_lock = sst26_lock; 2555 nor->flash_unlock = sst26_unlock; 2556 nor->flash_is_locked = sst26_is_locked; 2557 } 2558 2559 /* sst nor chips use AAI word program */ 2560 if (info->flags & SST_WRITE) 2561 mtd->_write = sst_write; 2562 else 2563 #endif 2564 mtd->_write = spi_nor_write; 2565 2566 if (info->flags & USE_FSR) 2567 nor->flags |= SNOR_F_USE_FSR; 2568 if (info->flags & SPI_NOR_HAS_TB) 2569 nor->flags |= SNOR_F_HAS_SR_TB; 2570 if (info->flags & NO_CHIP_ERASE) 2571 nor->flags |= SNOR_F_NO_OP_CHIP_ERASE; 2572 if (info->flags & USE_CLSR) 2573 nor->flags |= SNOR_F_USE_CLSR; 2574 2575 if (info->flags & SPI_NOR_NO_ERASE) 2576 mtd->flags |= MTD_NO_ERASE; 2577 2578 nor->page_size = params.page_size; 2579 mtd->writebufsize = nor->page_size; 2580 2581 /* Some devices cannot do fast-read, no matter what DT tells us */ 2582 if ((info->flags & SPI_NOR_NO_FR) || (spi->mode & SPI_RX_SLOW)) 2583 params.hwcaps.mask &= ~SNOR_HWCAPS_READ_FAST; 2584 2585 /* 2586 * Configure the SPI memory: 2587 * - select op codes for (Fast) Read, Page Program and Sector Erase. 2588 * - set the number of dummy cycles (mode cycles + wait states). 2589 * - set the SPI protocols for register and memory accesses. 2590 * - set the Quad Enable bit if needed (required by SPI x-y-4 protos). 2591 */ 2592 ret = spi_nor_setup(nor, info, ¶ms, &hwcaps); 2593 if (ret) 2594 return ret; 2595 2596 if (nor->addr_width) { 2597 /* already configured from SFDP */ 2598 } else if (info->addr_width) { 2599 nor->addr_width = info->addr_width; 2600 } else if (mtd->size > SZ_16M) { 2601 #ifndef CONFIG_SPI_FLASH_BAR 2602 /* enable 4-byte addressing if the device exceeds 16MiB */ 2603 nor->addr_width = 4; 2604 if (JEDEC_MFR(info) == SNOR_MFR_SPANSION || 2605 info->flags & SPI_NOR_4B_OPCODES) 2606 spi_nor_set_4byte_opcodes(nor, info); 2607 #else 2608 /* Configure the BAR - discover bank cmds and read current bank */ 2609 nor->addr_width = 3; 2610 ret = read_bar(nor, info); 2611 if (ret < 0) 2612 return ret; 2613 #endif 2614 } else { 2615 nor->addr_width = 3; 2616 } 2617 2618 if (nor->addr_width > SPI_NOR_MAX_ADDR_WIDTH) { 2619 dev_dbg(dev, "address width is too large: %u\n", 2620 nor->addr_width); 2621 return -EINVAL; 2622 } 2623 2624 /* Send all the required SPI flash commands to initialize device */ 2625 nor->info = info; 2626 ret = spi_nor_init(nor); 2627 if (ret) 2628 return ret; 2629 2630 nor->name = mtd->name; 2631 nor->size = mtd->size; 2632 nor->erase_size = mtd->erasesize; 2633 nor->sector_size = mtd->erasesize; 2634 2635 #ifndef CONFIG_SPL_BUILD 2636 printf("SF: Detected %s with page size ", nor->name); 2637 print_size(nor->page_size, ", erase size "); 2638 print_size(nor->erase_size, ", total "); 2639 print_size(nor->size, ""); 2640 puts("\n"); 2641 #endif 2642 2643 return 0; 2644 } 2645 2646 /* U-Boot specific functions, need to extend MTD to support these */ 2647 int spi_flash_cmd_get_sw_write_prot(struct spi_nor *nor) 2648 { 2649 int sr = read_sr(nor); 2650 2651 if (sr < 0) 2652 return sr; 2653 2654 return (sr >> 2) & 7; 2655 } 2656