1 // SPDX-License-Identifier: GPL-2.0
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
6 * Copyright (C) 2005, Intec Automation Inc.
7 * Copyright (C) 2014, Freescale Semiconductor, Inc.
9 * Synced from Linux v4.19
14 #include <dm/device_compat.h>
15 #include <linux/err.h>
16 #include <linux/errno.h>
17 #include <linux/log2.h>
18 #include <linux/math64.h>
19 #include <linux/sizes.h>
21 #include <linux/mtd/mtd.h>
22 #include <linux/mtd/spi-nor.h>
26 #include "sf_internal.h"
28 /* Define max times to check status register before we give up. */
31 * For everything but full-chip erase; probably could be much smaller, but kept
32 * around for safety for now
35 #define HZ CONFIG_SYS_HZ
37 #define DEFAULT_READY_WAIT_JIFFIES (40UL * HZ)
39 static int spi_nor_read_write_reg(struct spi_nor *nor, struct spi_mem_op
42 if (op->data.dir == SPI_MEM_DATA_IN)
43 op->data.buf.in = buf;
45 op->data.buf.out = buf;
46 return spi_mem_exec_op(nor->spi, op);
49 static int spi_nor_read_reg(struct spi_nor *nor, u8 code, u8 *val, int len)
51 struct spi_mem_op op = SPI_MEM_OP(SPI_MEM_OP_CMD(code, 1),
54 SPI_MEM_OP_DATA_IN(len, NULL, 1));
57 ret = spi_nor_read_write_reg(nor, &op, val);
59 dev_dbg(&flash->spimem->spi->dev, "error %d reading %x\n", ret,
65 static int spi_nor_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
67 struct spi_mem_op op = SPI_MEM_OP(SPI_MEM_OP_CMD(opcode, 1),
70 SPI_MEM_OP_DATA_OUT(len, NULL, 1));
72 return spi_nor_read_write_reg(nor, &op, buf);
75 static ssize_t spi_nor_read_data(struct spi_nor *nor, loff_t from, size_t len,
78 struct spi_mem_op op =
79 SPI_MEM_OP(SPI_MEM_OP_CMD(nor->read_opcode, 1),
80 SPI_MEM_OP_ADDR(nor->addr_width, from, 1),
81 SPI_MEM_OP_DUMMY(nor->read_dummy, 1),
82 SPI_MEM_OP_DATA_IN(len, buf, 1));
83 size_t remaining = len;
86 /* get transfer protocols. */
87 op.cmd.buswidth = spi_nor_get_protocol_inst_nbits(nor->read_proto);
88 op.addr.buswidth = spi_nor_get_protocol_addr_nbits(nor->read_proto);
89 op.dummy.buswidth = op.addr.buswidth;
90 op.data.buswidth = spi_nor_get_protocol_data_nbits(nor->read_proto);
92 /* convert the dummy cycles to the number of bytes */
93 op.dummy.nbytes = (nor->read_dummy * op.dummy.buswidth) / 8;
96 op.data.nbytes = remaining < UINT_MAX ? remaining : UINT_MAX;
97 ret = spi_mem_adjust_op_size(nor->spi, &op);
101 ret = spi_mem_exec_op(nor->spi, &op);
105 op.addr.val += op.data.nbytes;
106 remaining -= op.data.nbytes;
107 op.data.buf.in += op.data.nbytes;
113 #if defined(CONFIG_SPI_FLASH_SPANSION) || defined(CONFIG_SPI_FLASH_WINBOND)
115 * Read configuration register, returning its value in the
116 * location. Return the configuration register value.
117 * Returns negative if error occurred.
119 static int read_cr(struct spi_nor *nor)
124 ret = spi_nor_read_reg(nor, SPINOR_OP_RDCR, &val, 1);
126 dev_dbg(nor->dev, "error %d reading CR\n", ret);
135 * Write status register 1 byte
136 * Returns negative if error occurred.
138 static inline int write_sr(struct spi_nor *nor, u8 val)
140 nor->cmd_buf[0] = val;
141 return spi_nor_write_reg(nor, SPINOR_OP_WRSR, nor->cmd_buf, 1);
145 * Set write enable latch with Write Enable command.
146 * Returns negative if error occurred.
148 static inline int write_enable(struct spi_nor *nor)
150 return spi_nor_write_reg(nor, SPINOR_OP_WREN, NULL, 0);
154 * Send write disable instruction to the chip.
156 static inline int write_disable(struct spi_nor *nor)
158 return spi_nor_write_reg(nor, SPINOR_OP_WRDI, NULL, 0);
161 static inline struct spi_nor *mtd_to_spi_nor(struct mtd_info *mtd)
166 static u8 spi_nor_convert_opcode(u8 opcode, const u8 table[][2], size_t size)
170 for (i = 0; i < size; i++)
171 if (table[i][0] == opcode)
174 /* No conversion found, keep input op code. */
178 static inline u8 spi_nor_convert_3to4_read(u8 opcode)
180 static const u8 spi_nor_3to4_read[][2] = {
181 { SPINOR_OP_READ, SPINOR_OP_READ_4B },
182 { SPINOR_OP_READ_FAST, SPINOR_OP_READ_FAST_4B },
183 { SPINOR_OP_READ_1_1_2, SPINOR_OP_READ_1_1_2_4B },
184 { SPINOR_OP_READ_1_2_2, SPINOR_OP_READ_1_2_2_4B },
185 { SPINOR_OP_READ_1_1_4, SPINOR_OP_READ_1_1_4_4B },
186 { SPINOR_OP_READ_1_4_4, SPINOR_OP_READ_1_4_4_4B },
189 return spi_nor_convert_opcode(opcode, spi_nor_3to4_read,
190 ARRAY_SIZE(spi_nor_3to4_read));
193 static void spi_nor_set_4byte_opcodes(struct spi_nor *nor,
194 const struct flash_info *info)
196 nor->read_opcode = spi_nor_convert_3to4_read(nor->read_opcode);
199 /* Enable/disable 4-byte addressing mode. */
200 static inline int set_4byte(struct spi_nor *nor, const struct flash_info *info,
204 bool need_wren = false;
207 switch (JEDEC_MFR(info)) {
209 case SNOR_MFR_MICRON:
210 /* Some Micron need WREN command; all will accept it */
212 case SNOR_MFR_MACRONIX:
213 case SNOR_MFR_WINBOND:
217 cmd = enable ? SPINOR_OP_EN4B : SPINOR_OP_EX4B;
218 status = spi_nor_write_reg(nor, cmd, NULL, 0);
222 if (!status && !enable &&
223 JEDEC_MFR(info) == SNOR_MFR_WINBOND) {
225 * On Winbond W25Q256FV, leaving 4byte mode causes
226 * the Extended Address Register to be set to 1, so all
227 * 3-byte-address reads come from the second 16M.
228 * We must clear the register to enable normal behavior.
232 spi_nor_write_reg(nor, SPINOR_OP_WREAR,
240 nor->cmd_buf[0] = enable << 7;
241 return spi_nor_write_reg(nor, SPINOR_OP_BRWR, nor->cmd_buf, 1);
245 #if defined(CONFIG_SPI_FLASH_SPANSION) || \
246 defined(CONFIG_SPI_FLASH_WINBOND) || \
247 defined(CONFIG_SPI_FLASH_MACRONIX)
249 * Read the status register, returning its value in the location
250 * Return the status register value.
251 * Returns negative if error occurred.
253 static int read_sr(struct spi_nor *nor)
258 ret = spi_nor_read_reg(nor, SPINOR_OP_RDSR, &val, 1);
260 pr_debug("error %d reading SR\n", (int)ret);
268 * Read the flag status register, returning its value in the location
269 * Return the status register value.
270 * Returns negative if error occurred.
272 static int read_fsr(struct spi_nor *nor)
277 ret = spi_nor_read_reg(nor, SPINOR_OP_RDFSR, &val, 1);
279 pr_debug("error %d reading FSR\n", ret);
286 static int spi_nor_sr_ready(struct spi_nor *nor)
288 int sr = read_sr(nor);
293 return !(sr & SR_WIP);
296 static int spi_nor_fsr_ready(struct spi_nor *nor)
298 int fsr = read_fsr(nor);
302 return fsr & FSR_READY;
305 static int spi_nor_ready(struct spi_nor *nor)
309 sr = spi_nor_sr_ready(nor);
312 fsr = nor->flags & SNOR_F_USE_FSR ? spi_nor_fsr_ready(nor) : 1;
319 * Service routine to read status register until ready, or timeout occurs.
320 * Returns non-zero if error.
322 static int spi_nor_wait_till_ready_with_timeout(struct spi_nor *nor,
323 unsigned long timeout)
325 unsigned long timebase;
328 timebase = get_timer(0);
330 while (get_timer(timebase) < timeout) {
331 ret = spi_nor_ready(nor);
338 dev_err(nor->dev, "flash operation timed out\n");
343 static int spi_nor_wait_till_ready(struct spi_nor *nor)
345 return spi_nor_wait_till_ready_with_timeout(nor,
346 DEFAULT_READY_WAIT_JIFFIES);
348 #endif /* CONFIG_SPI_FLASH_SPANSION */
351 * Erase an address range on the nor chip. The address range may extend
352 * one or more erase sectors. Return an error is there is a problem erasing.
354 static int spi_nor_erase(struct mtd_info *mtd, struct erase_info *instr)
359 static const struct flash_info *spi_nor_read_id(struct spi_nor *nor)
362 u8 id[SPI_NOR_MAX_ID_LEN];
363 const struct flash_info *info;
365 tmp = spi_nor_read_reg(nor, SPINOR_OP_RDID, id, SPI_NOR_MAX_ID_LEN);
367 dev_dbg(nor->dev, "error %d reading JEDEC ID\n", tmp);
372 for (; info->sector_size != 0; info++) {
374 if (!memcmp(info->id, id, info->id_len))
378 dev_dbg(nor->dev, "unrecognized JEDEC id bytes: %02x, %02x, %02x\n",
379 id[0], id[1], id[2]);
380 return ERR_PTR(-ENODEV);
383 static int spi_nor_read(struct mtd_info *mtd, loff_t from, size_t len,
384 size_t *retlen, u_char *buf)
386 struct spi_nor *nor = mtd_to_spi_nor(mtd);
389 dev_dbg(nor->dev, "from 0x%08x, len %zd\n", (u32)from, len);
394 ret = spi_nor_read_data(nor, addr, len, buf);
396 /* We shouldn't see 0-length reads */
415 * Write an address range to the nor chip. Data must be written in
416 * FLASH_PAGESIZE chunks. The address range may be any size provided
417 * it is within the physical boundaries.
419 static int spi_nor_write(struct mtd_info *mtd, loff_t to, size_t len,
420 size_t *retlen, const u_char *buf)
425 #ifdef CONFIG_SPI_FLASH_MACRONIX
427 * macronix_quad_enable() - set QE bit in Status Register.
428 * @nor: pointer to a 'struct spi_nor'
430 * Set the Quad Enable (QE) bit in the Status Register.
432 * bit 6 of the Status Register is the QE bit for Macronix like QSPI memories.
434 * Return: 0 on success, -errno otherwise.
436 static int macronix_quad_enable(struct spi_nor *nor)
443 if (val & SR_QUAD_EN_MX)
448 write_sr(nor, val | SR_QUAD_EN_MX);
450 ret = spi_nor_wait_till_ready(nor);
455 if (!(ret > 0 && (ret & SR_QUAD_EN_MX))) {
456 dev_err(nor->dev, "Macronix Quad bit not set\n");
464 #if defined(CONFIG_SPI_FLASH_SPANSION) || defined(CONFIG_SPI_FLASH_WINBOND)
466 * Write status Register and configuration register with 2 bytes
467 * The first byte will be written to the status register, while the
468 * second byte will be written to the configuration register.
469 * Return negative if error occurred.
471 static int write_sr_cr(struct spi_nor *nor, u8 *sr_cr)
477 ret = spi_nor_write_reg(nor, SPINOR_OP_WRSR, sr_cr, 2);
480 "error while writing configuration register\n");
484 ret = spi_nor_wait_till_ready(nor);
487 "timeout while writing configuration register\n");
495 * spansion_read_cr_quad_enable() - set QE bit in Configuration Register.
496 * @nor: pointer to a 'struct spi_nor'
498 * Set the Quad Enable (QE) bit in the Configuration Register.
499 * This function should be used with QSPI memories supporting the Read
500 * Configuration Register (35h) instruction.
502 * bit 1 of the Configuration Register is the QE bit for Spansion like QSPI
505 * Return: 0 on success, -errno otherwise.
507 static int spansion_read_cr_quad_enable(struct spi_nor *nor)
512 /* Check current Quad Enable bit value. */
515 dev_dbg(dev, "error while reading configuration register\n");
519 if (ret & CR_QUAD_EN_SPAN)
522 sr_cr[1] = ret | CR_QUAD_EN_SPAN;
524 /* Keep the current value of the Status Register. */
527 dev_dbg(dev, "error while reading status register\n");
532 ret = write_sr_cr(nor, sr_cr);
536 /* Read back and check it. */
538 if (!(ret > 0 && (ret & CR_QUAD_EN_SPAN))) {
539 dev_dbg(nor->dev, "Spansion Quad bit not set\n");
545 #endif /* CONFIG_SPI_FLASH_SPANSION */
547 struct spi_nor_read_command {
551 enum spi_nor_protocol proto;
554 enum spi_nor_read_command_index {
564 struct spi_nor_flash_parameter {
565 struct spi_nor_hwcaps hwcaps;
566 struct spi_nor_read_command reads[SNOR_CMD_READ_MAX];
570 spi_nor_set_read_settings(struct spi_nor_read_command *read,
574 enum spi_nor_protocol proto)
576 read->num_mode_clocks = num_mode_clocks;
577 read->num_wait_states = num_wait_states;
578 read->opcode = opcode;
582 static int spi_nor_init_params(struct spi_nor *nor,
583 const struct flash_info *info,
584 struct spi_nor_flash_parameter *params)
586 /* (Fast) Read settings. */
587 params->hwcaps.mask = SNOR_HWCAPS_READ;
588 spi_nor_set_read_settings(¶ms->reads[SNOR_CMD_READ],
589 0, 0, SPINOR_OP_READ,
592 if (!(info->flags & SPI_NOR_NO_FR)) {
593 params->hwcaps.mask |= SNOR_HWCAPS_READ_FAST;
594 spi_nor_set_read_settings(¶ms->reads[SNOR_CMD_READ_FAST],
595 0, 8, SPINOR_OP_READ_FAST,
599 if (info->flags & SPI_NOR_QUAD_READ) {
600 params->hwcaps.mask |= SNOR_HWCAPS_READ_1_1_4;
601 spi_nor_set_read_settings(¶ms->reads[SNOR_CMD_READ_1_1_4],
602 0, 8, SPINOR_OP_READ_1_1_4,
609 static int spi_nor_select_read(struct spi_nor *nor,
610 const struct spi_nor_flash_parameter *params,
613 int best_match = shared_hwcaps & SNOR_HWCAPS_READ_MASK;
615 const struct spi_nor_read_command *read;
620 if (best_match & SNOR_HWCAPS_READ_1_1_4)
621 cmd = SNOR_CMD_READ_1_1_4;
622 else if (best_match & SNOR_HWCAPS_READ_FAST)
623 cmd = SNOR_CMD_READ_FAST;
627 read = ¶ms->reads[cmd];
628 nor->read_opcode = read->opcode;
629 nor->read_proto = read->proto;
632 * In the spi-nor framework, we don't need to make the difference
633 * between mode clock cycles and wait state clock cycles.
634 * Indeed, the value of the mode clock cycles is used by a QSPI
635 * flash memory to know whether it should enter or leave its 0-4-4
636 * (Continuous Read / XIP) mode.
637 * eXecution In Place is out of the scope of the mtd sub-system.
638 * Hence we choose to merge both mode and wait state clock cycles
639 * into the so called dummy clock cycles.
641 nor->read_dummy = read->num_mode_clocks + read->num_wait_states;
645 static int spi_nor_setup(struct spi_nor *nor, const struct flash_info *info,
646 const struct spi_nor_flash_parameter *params,
647 const struct spi_nor_hwcaps *hwcaps)
653 * Keep only the hardware capabilities supported by both the SPI
654 * controller and the SPI flash memory.
656 shared_mask = hwcaps->mask & params->hwcaps.mask;
658 /* Select the (Fast) Read command. */
659 err = spi_nor_select_read(nor, params, shared_mask);
662 "can't select read settings supported by both the SPI controller and memory.\n");
666 /* Enable Quad I/O if needed. */
667 if (spi_nor_get_protocol_width(nor->read_proto) == 4) {
668 switch (JEDEC_MFR(info)) {
669 #ifdef CONFIG_SPI_FLASH_MACRONIX
670 case SNOR_MFR_MACRONIX:
671 err = macronix_quad_enable(nor);
675 case SNOR_MFR_MICRON:
679 #if defined(CONFIG_SPI_FLASH_SPANSION) || defined(CONFIG_SPI_FLASH_WINBOND)
680 /* Kept only for backward compatibility purpose. */
681 err = spansion_read_cr_quad_enable(nor);
687 dev_dbg(nor->dev, "quad mode not supported\n");
694 static int spi_nor_init(struct spi_nor *nor)
696 if (nor->addr_width == 4 &&
697 (JEDEC_MFR(nor->info) != SNOR_MFR_SPANSION) &&
698 !(nor->info->flags & SPI_NOR_4B_OPCODES)) {
700 * If the RESET# pin isn't hooked up properly, or the system
701 * otherwise doesn't perform a reset command in the boot
702 * sequence, it's impossible to 100% protect against unexpected
703 * reboots (e.g., crashes). Warn the user (or hopefully, system
704 * designer) that this is bad.
706 if (nor->flags & SNOR_F_BROKEN_RESET)
707 printf("enabling reset hack; may not recover from unexpected reboots\n");
708 set_4byte(nor, nor->info, 1);
714 int spi_nor_scan(struct spi_nor *nor)
716 struct spi_nor_flash_parameter params;
717 const struct flash_info *info = NULL;
718 struct mtd_info *mtd = &nor->mtd;
719 struct spi_nor_hwcaps hwcaps = {
720 .mask = SNOR_HWCAPS_READ |
721 SNOR_HWCAPS_READ_FAST
723 struct spi_slave *spi = nor->spi;
726 /* Reset SPI protocol for all commands. */
727 nor->reg_proto = SNOR_PROTO_1_1_1;
728 nor->read_proto = SNOR_PROTO_1_1_1;
729 nor->write_proto = SNOR_PROTO_1_1_1;
731 if (spi->mode & SPI_RX_QUAD)
732 hwcaps.mask |= SNOR_HWCAPS_READ_1_1_4;
734 info = spi_nor_read_id(nor);
735 if (IS_ERR_OR_NULL(info))
737 /* Parse the Serial Flash Discoverable Parameters table. */
738 ret = spi_nor_init_params(nor, info, ¶ms);
742 mtd->name = "spi-flash";
744 mtd->type = MTD_NORFLASH;
746 mtd->flags = MTD_CAP_NORFLASH;
747 mtd->size = info->sector_size * info->n_sectors;
748 mtd->_erase = spi_nor_erase;
749 mtd->_read = spi_nor_read;
750 mtd->_write = spi_nor_write;
752 nor->size = mtd->size;
754 if (info->flags & USE_FSR)
755 nor->flags |= SNOR_F_USE_FSR;
756 if (info->flags & USE_CLSR)
757 nor->flags |= SNOR_F_USE_CLSR;
759 if (info->flags & SPI_NOR_NO_FR)
760 params.hwcaps.mask &= ~SNOR_HWCAPS_READ_FAST;
763 * Configure the SPI memory:
764 * - select op codes for (Fast) Read, Page Program and Sector Erase.
765 * - set the number of dummy cycles (mode cycles + wait states).
766 * - set the SPI protocols for register and memory accesses.
767 * - set the Quad Enable bit if needed (required by SPI x-y-4 protos).
769 ret = spi_nor_setup(nor, info, ¶ms, &hwcaps);
773 if (nor->addr_width) {
774 /* already configured from SFDP */
775 } else if (info->addr_width) {
776 nor->addr_width = info->addr_width;
777 } else if (mtd->size > 0x1000000) {
778 /* enable 4-byte addressing if the device exceeds 16MiB */
780 if (JEDEC_MFR(info) == SNOR_MFR_SPANSION ||
781 info->flags & SPI_NOR_4B_OPCODES)
782 spi_nor_set_4byte_opcodes(nor, info);
787 if (nor->addr_width > SPI_NOR_MAX_ADDR_WIDTH) {
788 dev_dbg(dev, "address width is too large: %u\n",
793 /* Send all the required SPI flash commands to initialize device */
795 ret = spi_nor_init(nor);
802 /* U-Boot specific functions, need to extend MTD to support these */
803 int spi_flash_cmd_get_sw_write_prot(struct spi_nor *nor)