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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Based on m25p80.c, by Mike Lavender (mike@steroidmicros.com), with
- * influence from lart.c (Abraham Van Der Merwe) and mtd_dataflash.c
- *
- * Copyright (C) 2005, Intec Automation Inc.
- * Copyright (C) 2014, Freescale Semiconductor, Inc.
- *
- * Synced from Linux v4.19
- */
- #include <common.h>
- #include <dm/device_compat.h>
- #include <dm/devres.h>
- #include <linux/err.h>
- #include <linux/errno.h>
- #include <linux/log2.h>
- #include <linux/math64.h>
- #include <linux/sizes.h>
- #include <linux/mtd/mtd.h>
- #include <linux/mtd/spi-nor.h>
- #include <spi-mem.h>
- #include <spi.h>
- #include "sf_internal.h"
- /* Define max times to check status register before we give up. */
- /*
- * For everything but full-chip erase; probably could be much smaller, but kept
- * around for safety for now
- */
- #define HZ CONFIG_SYS_HZ
- #define DEFAULT_READY_WAIT_JIFFIES (40UL * HZ)
- static int spi_nor_read_write_reg(struct spi_nor *nor, struct spi_mem_op
- *op, void *buf)
- {
- if (op->data.dir == SPI_MEM_DATA_IN)
- op->data.buf.in = buf;
- else
- op->data.buf.out = buf;
- return spi_mem_exec_op(nor->spi, op);
- }
- static int spi_nor_read_reg(struct spi_nor *nor, u8 code, u8 *val, int len)
- {
- struct spi_mem_op op = SPI_MEM_OP(SPI_MEM_OP_CMD(code, 1),
- SPI_MEM_OP_NO_ADDR,
- SPI_MEM_OP_NO_DUMMY,
- SPI_MEM_OP_DATA_IN(len, NULL, 1));
- int ret;
- ret = spi_nor_read_write_reg(nor, &op, val);
- if (ret < 0)
- dev_dbg(&flash->spimem->spi->dev, "error %d reading %x\n", ret,
- code);
- return ret;
- }
- static int spi_nor_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
- {
- struct spi_mem_op op = SPI_MEM_OP(SPI_MEM_OP_CMD(opcode, 1),
- SPI_MEM_OP_NO_ADDR,
- SPI_MEM_OP_NO_DUMMY,
- SPI_MEM_OP_DATA_OUT(len, NULL, 1));
- return spi_nor_read_write_reg(nor, &op, buf);
- }
- static ssize_t spi_nor_read_data(struct spi_nor *nor, loff_t from, size_t len,
- u_char *buf)
- {
- struct spi_mem_op op =
- SPI_MEM_OP(SPI_MEM_OP_CMD(nor->read_opcode, 1),
- SPI_MEM_OP_ADDR(nor->addr_width, from, 1),
- SPI_MEM_OP_DUMMY(nor->read_dummy, 1),
- SPI_MEM_OP_DATA_IN(len, buf, 1));
- size_t remaining = len;
- int ret;
- /* get transfer protocols. */
- op.cmd.buswidth = spi_nor_get_protocol_inst_nbits(nor->read_proto);
- op.addr.buswidth = spi_nor_get_protocol_addr_nbits(nor->read_proto);
- op.dummy.buswidth = op.addr.buswidth;
- op.data.buswidth = spi_nor_get_protocol_data_nbits(nor->read_proto);
- /* convert the dummy cycles to the number of bytes */
- op.dummy.nbytes = (nor->read_dummy * op.dummy.buswidth) / 8;
- while (remaining) {
- op.data.nbytes = remaining < UINT_MAX ? remaining : UINT_MAX;
- ret = spi_mem_adjust_op_size(nor->spi, &op);
- if (ret)
- return ret;
- ret = spi_mem_exec_op(nor->spi, &op);
- if (ret)
- return ret;
- op.addr.val += op.data.nbytes;
- remaining -= op.data.nbytes;
- op.data.buf.in += op.data.nbytes;
- }
- return len;
- }
- static ssize_t spi_nor_write_data(struct spi_nor *nor, loff_t to, size_t len,
- const u_char *buf)
- {
- struct spi_mem_op op =
- SPI_MEM_OP(SPI_MEM_OP_CMD(nor->program_opcode, 1),
- SPI_MEM_OP_ADDR(nor->addr_width, to, 1),
- SPI_MEM_OP_NO_DUMMY,
- SPI_MEM_OP_DATA_OUT(len, buf, 1));
- int ret;
- /* get transfer protocols. */
- op.cmd.buswidth = spi_nor_get_protocol_inst_nbits(nor->write_proto);
- op.addr.buswidth = spi_nor_get_protocol_addr_nbits(nor->write_proto);
- op.data.buswidth = spi_nor_get_protocol_data_nbits(nor->write_proto);
- if (nor->program_opcode == SPINOR_OP_AAI_WP && nor->sst_write_second)
- op.addr.nbytes = 0;
- ret = spi_mem_adjust_op_size(nor->spi, &op);
- if (ret)
- return ret;
- op.data.nbytes = len < op.data.nbytes ? len : op.data.nbytes;
- ret = spi_mem_exec_op(nor->spi, &op);
- if (ret)
- return ret;
- return op.data.nbytes;
- }
- /*
- * Read the status register, returning its value in the location
- * Return the status register value.
- * Returns negative if error occurred.
- */
- static int read_sr(struct spi_nor *nor)
- {
- int ret;
- u8 val;
- ret = nor->read_reg(nor, SPINOR_OP_RDSR, &val, 1);
- if (ret < 0) {
- pr_debug("error %d reading SR\n", (int)ret);
- return ret;
- }
- return val;
- }
- /*
- * Read the flag status register, returning its value in the location
- * Return the status register value.
- * Returns negative if error occurred.
- */
- static int read_fsr(struct spi_nor *nor)
- {
- int ret;
- u8 val;
- ret = nor->read_reg(nor, SPINOR_OP_RDFSR, &val, 1);
- if (ret < 0) {
- pr_debug("error %d reading FSR\n", ret);
- return ret;
- }
- return val;
- }
- /*
- * Read configuration register, returning its value in the
- * location. Return the configuration register value.
- * Returns negative if error occurred.
- */
- #if defined(CONFIG_SPI_FLASH_SPANSION) || defined(CONFIG_SPI_FLASH_WINBOND)
- static int read_cr(struct spi_nor *nor)
- {
- int ret;
- u8 val;
- ret = nor->read_reg(nor, SPINOR_OP_RDCR, &val, 1);
- if (ret < 0) {
- dev_dbg(nor->dev, "error %d reading CR\n", ret);
- return ret;
- }
- return val;
- }
- #endif
- /*
- * Write status register 1 byte
- * Returns negative if error occurred.
- */
- static int write_sr(struct spi_nor *nor, u8 val)
- {
- nor->cmd_buf[0] = val;
- return nor->write_reg(nor, SPINOR_OP_WRSR, nor->cmd_buf, 1);
- }
- /*
- * Set write enable latch with Write Enable command.
- * Returns negative if error occurred.
- */
- static int write_enable(struct spi_nor *nor)
- {
- return nor->write_reg(nor, SPINOR_OP_WREN, NULL, 0);
- }
- /*
- * Send write disable instruction to the chip.
- */
- static int write_disable(struct spi_nor *nor)
- {
- return nor->write_reg(nor, SPINOR_OP_WRDI, NULL, 0);
- }
- static struct spi_nor *mtd_to_spi_nor(struct mtd_info *mtd)
- {
- return mtd->priv;
- }
- #ifndef CONFIG_SPI_FLASH_BAR
- static u8 spi_nor_convert_opcode(u8 opcode, const u8 table[][2], size_t size)
- {
- size_t i;
- for (i = 0; i < size; i++)
- if (table[i][0] == opcode)
- return table[i][1];
- /* No conversion found, keep input op code. */
- return opcode;
- }
- static u8 spi_nor_convert_3to4_read(u8 opcode)
- {
- static const u8 spi_nor_3to4_read[][2] = {
- { SPINOR_OP_READ, SPINOR_OP_READ_4B },
- { SPINOR_OP_READ_FAST, SPINOR_OP_READ_FAST_4B },
- { SPINOR_OP_READ_1_1_2, SPINOR_OP_READ_1_1_2_4B },
- { SPINOR_OP_READ_1_2_2, SPINOR_OP_READ_1_2_2_4B },
- { SPINOR_OP_READ_1_1_4, SPINOR_OP_READ_1_1_4_4B },
- { SPINOR_OP_READ_1_4_4, SPINOR_OP_READ_1_4_4_4B },
- { SPINOR_OP_READ_1_1_8, SPINOR_OP_READ_1_1_8_4B },
- { SPINOR_OP_READ_1_8_8, SPINOR_OP_READ_1_8_8_4B },
- { SPINOR_OP_READ_1_1_1_DTR, SPINOR_OP_READ_1_1_1_DTR_4B },
- { SPINOR_OP_READ_1_2_2_DTR, SPINOR_OP_READ_1_2_2_DTR_4B },
- { SPINOR_OP_READ_1_4_4_DTR, SPINOR_OP_READ_1_4_4_DTR_4B },
- };
- return spi_nor_convert_opcode(opcode, spi_nor_3to4_read,
- ARRAY_SIZE(spi_nor_3to4_read));
- }
- static u8 spi_nor_convert_3to4_program(u8 opcode)
- {
- static const u8 spi_nor_3to4_program[][2] = {
- { SPINOR_OP_PP, SPINOR_OP_PP_4B },
- { SPINOR_OP_PP_1_1_4, SPINOR_OP_PP_1_1_4_4B },
- { SPINOR_OP_PP_1_4_4, SPINOR_OP_PP_1_4_4_4B },
- { SPINOR_OP_PP_1_1_8, SPINOR_OP_PP_1_1_8_4B },
- { SPINOR_OP_PP_1_8_8, SPINOR_OP_PP_1_8_8_4B },
- };
- return spi_nor_convert_opcode(opcode, spi_nor_3to4_program,
- ARRAY_SIZE(spi_nor_3to4_program));
- }
- static u8 spi_nor_convert_3to4_erase(u8 opcode)
- {
- static const u8 spi_nor_3to4_erase[][2] = {
- { SPINOR_OP_BE_4K, SPINOR_OP_BE_4K_4B },
- { SPINOR_OP_BE_32K, SPINOR_OP_BE_32K_4B },
- { SPINOR_OP_SE, SPINOR_OP_SE_4B },
- };
- return spi_nor_convert_opcode(opcode, spi_nor_3to4_erase,
- ARRAY_SIZE(spi_nor_3to4_erase));
- }
- static void spi_nor_set_4byte_opcodes(struct spi_nor *nor,
- const struct flash_info *info)
- {
- /* Do some manufacturer fixups first */
- switch (JEDEC_MFR(info)) {
- case SNOR_MFR_SPANSION:
- /* No small sector erase for 4-byte command set */
- nor->erase_opcode = SPINOR_OP_SE;
- nor->mtd.erasesize = info->sector_size;
- break;
- default:
- break;
- }
- nor->read_opcode = spi_nor_convert_3to4_read(nor->read_opcode);
- nor->program_opcode = spi_nor_convert_3to4_program(nor->program_opcode);
- nor->erase_opcode = spi_nor_convert_3to4_erase(nor->erase_opcode);
- }
- #endif /* !CONFIG_SPI_FLASH_BAR */
- /* Enable/disable 4-byte addressing mode. */
- static int set_4byte(struct spi_nor *nor, const struct flash_info *info,
- int enable)
- {
- int status;
- bool need_wren = false;
- u8 cmd;
- switch (JEDEC_MFR(info)) {
- case SNOR_MFR_ST:
- case SNOR_MFR_MICRON:
- /* Some Micron need WREN command; all will accept it */
- need_wren = true;
- case SNOR_MFR_ISSI:
- case SNOR_MFR_MACRONIX:
- case SNOR_MFR_WINBOND:
- if (need_wren)
- write_enable(nor);
- cmd = enable ? SPINOR_OP_EN4B : SPINOR_OP_EX4B;
- status = nor->write_reg(nor, cmd, NULL, 0);
- if (need_wren)
- write_disable(nor);
- if (!status && !enable &&
- JEDEC_MFR(info) == SNOR_MFR_WINBOND) {
- /*
- * On Winbond W25Q256FV, leaving 4byte mode causes
- * the Extended Address Register to be set to 1, so all
- * 3-byte-address reads come from the second 16M.
- * We must clear the register to enable normal behavior.
- */
- write_enable(nor);
- nor->cmd_buf[0] = 0;
- nor->write_reg(nor, SPINOR_OP_WREAR, nor->cmd_buf, 1);
- write_disable(nor);
- }
- return status;
- default:
- /* Spansion style */
- nor->cmd_buf[0] = enable << 7;
- return nor->write_reg(nor, SPINOR_OP_BRWR, nor->cmd_buf, 1);
- }
- }
- static int spi_nor_sr_ready(struct spi_nor *nor)
- {
- int sr = read_sr(nor);
- if (sr < 0)
- return sr;
- if (nor->flags & SNOR_F_USE_CLSR && sr & (SR_E_ERR | SR_P_ERR)) {
- if (sr & SR_E_ERR)
- dev_dbg(nor->dev, "Erase Error occurred\n");
- else
- dev_dbg(nor->dev, "Programming Error occurred\n");
- nor->write_reg(nor, SPINOR_OP_CLSR, NULL, 0);
- return -EIO;
- }
- return !(sr & SR_WIP);
- }
- static int spi_nor_fsr_ready(struct spi_nor *nor)
- {
- int fsr = read_fsr(nor);
- if (fsr < 0)
- return fsr;
- if (fsr & (FSR_E_ERR | FSR_P_ERR)) {
- if (fsr & FSR_E_ERR)
- dev_err(nor->dev, "Erase operation failed.\n");
- else
- dev_err(nor->dev, "Program operation failed.\n");
- if (fsr & FSR_PT_ERR)
- dev_err(nor->dev,
- "Attempted to modify a protected sector.\n");
- nor->write_reg(nor, SPINOR_OP_CLFSR, NULL, 0);
- return -EIO;
- }
- return fsr & FSR_READY;
- }
- static int spi_nor_ready(struct spi_nor *nor)
- {
- int sr, fsr;
- sr = spi_nor_sr_ready(nor);
- if (sr < 0)
- return sr;
- fsr = nor->flags & SNOR_F_USE_FSR ? spi_nor_fsr_ready(nor) : 1;
- if (fsr < 0)
- return fsr;
- return sr && fsr;
- }
- /*
- * Service routine to read status register until ready, or timeout occurs.
- * Returns non-zero if error.
- */
- static int spi_nor_wait_till_ready_with_timeout(struct spi_nor *nor,
- unsigned long timeout)
- {
- unsigned long timebase;
- int ret;
- timebase = get_timer(0);
- while (get_timer(timebase) < timeout) {
- ret = spi_nor_ready(nor);
- if (ret < 0)
- return ret;
- if (ret)
- return 0;
- }
- dev_err(nor->dev, "flash operation timed out\n");
- return -ETIMEDOUT;
- }
- static int spi_nor_wait_till_ready(struct spi_nor *nor)
- {
- return spi_nor_wait_till_ready_with_timeout(nor,
- DEFAULT_READY_WAIT_JIFFIES);
- }
- #ifdef CONFIG_SPI_FLASH_BAR
- /*
- * This "clean_bar" is necessary in a situation when one was accessing
- * spi flash memory > 16 MiB by using Bank Address Register's BA24 bit.
- *
- * After it the BA24 bit shall be cleared to allow access to correct
- * memory region after SW reset (by calling "reset" command).
- *
- * Otherwise, the BA24 bit may be left set and then after reset, the
- * ROM would read/write/erase SPL from 16 MiB * bank_sel address.
- */
- static int clean_bar(struct spi_nor *nor)
- {
- u8 cmd, bank_sel = 0;
- if (nor->bank_curr == 0)
- return 0;
- cmd = nor->bank_write_cmd;
- nor->bank_curr = 0;
- write_enable(nor);
- return nor->write_reg(nor, cmd, &bank_sel, 1);
- }
- static int write_bar(struct spi_nor *nor, u32 offset)
- {
- u8 cmd, bank_sel;
- int ret;
- bank_sel = offset / SZ_16M;
- if (bank_sel == nor->bank_curr)
- goto bar_end;
- cmd = nor->bank_write_cmd;
- write_enable(nor);
- ret = nor->write_reg(nor, cmd, &bank_sel, 1);
- if (ret < 0) {
- debug("SF: fail to write bank register\n");
- return ret;
- }
- bar_end:
- nor->bank_curr = bank_sel;
- return nor->bank_curr;
- }
- static int read_bar(struct spi_nor *nor, const struct flash_info *info)
- {
- u8 curr_bank = 0;
- int ret;
- switch (JEDEC_MFR(info)) {
- case SNOR_MFR_SPANSION:
- nor->bank_read_cmd = SPINOR_OP_BRRD;
- nor->bank_write_cmd = SPINOR_OP_BRWR;
- break;
- default:
- nor->bank_read_cmd = SPINOR_OP_RDEAR;
- nor->bank_write_cmd = SPINOR_OP_WREAR;
- }
- ret = nor->read_reg(nor, nor->bank_read_cmd,
- &curr_bank, 1);
- if (ret) {
- debug("SF: fail to read bank addr register\n");
- return ret;
- }
- nor->bank_curr = curr_bank;
- return 0;
- }
- #endif
- /*
- * Initiate the erasure of a single sector
- */
- static int spi_nor_erase_sector(struct spi_nor *nor, u32 addr)
- {
- struct spi_mem_op op =
- SPI_MEM_OP(SPI_MEM_OP_CMD(nor->erase_opcode, 1),
- SPI_MEM_OP_ADDR(nor->addr_width, addr, 1),
- SPI_MEM_OP_NO_DUMMY,
- SPI_MEM_OP_NO_DATA);
- if (nor->erase)
- return nor->erase(nor, addr);
- /*
- * Default implementation, if driver doesn't have a specialized HW
- * control
- */
- return spi_mem_exec_op(nor->spi, &op);
- }
- /*
- * Erase an address range on the nor chip. The address range may extend
- * one or more erase sectors. Return an error is there is a problem erasing.
- */
- static int spi_nor_erase(struct mtd_info *mtd, struct erase_info *instr)
- {
- struct spi_nor *nor = mtd_to_spi_nor(mtd);
- u32 addr, len, rem;
- int ret;
- dev_dbg(nor->dev, "at 0x%llx, len %lld\n", (long long)instr->addr,
- (long long)instr->len);
- if (!instr->len)
- return 0;
- div_u64_rem(instr->len, mtd->erasesize, &rem);
- if (rem)
- return -EINVAL;
- addr = instr->addr;
- len = instr->len;
- while (len) {
- #ifdef CONFIG_SPI_FLASH_BAR
- ret = write_bar(nor, addr);
- if (ret < 0)
- return ret;
- #endif
- write_enable(nor);
- ret = spi_nor_erase_sector(nor, addr);
- if (ret)
- goto erase_err;
- addr += mtd->erasesize;
- len -= mtd->erasesize;
- ret = spi_nor_wait_till_ready(nor);
- if (ret)
- goto erase_err;
- }
- erase_err:
- #ifdef CONFIG_SPI_FLASH_BAR
- ret = clean_bar(nor);
- #endif
- write_disable(nor);
- return ret;
- }
- #if defined(CONFIG_SPI_FLASH_STMICRO) || defined(CONFIG_SPI_FLASH_SST)
- /* Write status register and ensure bits in mask match written values */
- static int write_sr_and_check(struct spi_nor *nor, u8 status_new, u8 mask)
- {
- int ret;
- write_enable(nor);
- ret = write_sr(nor, status_new);
- if (ret)
- return ret;
- ret = spi_nor_wait_till_ready(nor);
- if (ret)
- return ret;
- ret = read_sr(nor);
- if (ret < 0)
- return ret;
- return ((ret & mask) != (status_new & mask)) ? -EIO : 0;
- }
- static void stm_get_locked_range(struct spi_nor *nor, u8 sr, loff_t *ofs,
- uint64_t *len)
- {
- struct mtd_info *mtd = &nor->mtd;
- u8 mask = SR_BP2 | SR_BP1 | SR_BP0;
- int shift = ffs(mask) - 1;
- int pow;
- if (!(sr & mask)) {
- /* No protection */
- *ofs = 0;
- *len = 0;
- } else {
- pow = ((sr & mask) ^ mask) >> shift;
- *len = mtd->size >> pow;
- if (nor->flags & SNOR_F_HAS_SR_TB && sr & SR_TB)
- *ofs = 0;
- else
- *ofs = mtd->size - *len;
- }
- }
- /*
- * Return 1 if the entire region is locked (if @locked is true) or unlocked (if
- * @locked is false); 0 otherwise
- */
- static int stm_check_lock_status_sr(struct spi_nor *nor, loff_t ofs, u64 len,
- u8 sr, bool locked)
- {
- loff_t lock_offs;
- uint64_t lock_len;
- if (!len)
- return 1;
- stm_get_locked_range(nor, sr, &lock_offs, &lock_len);
- if (locked)
- /* Requested range is a sub-range of locked range */
- return (ofs + len <= lock_offs + lock_len) && (ofs >= lock_offs);
- else
- /* Requested range does not overlap with locked range */
- return (ofs >= lock_offs + lock_len) || (ofs + len <= lock_offs);
- }
- static int stm_is_locked_sr(struct spi_nor *nor, loff_t ofs, uint64_t len,
- u8 sr)
- {
- return stm_check_lock_status_sr(nor, ofs, len, sr, true);
- }
- static int stm_is_unlocked_sr(struct spi_nor *nor, loff_t ofs, uint64_t len,
- u8 sr)
- {
- return stm_check_lock_status_sr(nor, ofs, len, sr, false);
- }
- /*
- * Lock a region of the flash. Compatible with ST Micro and similar flash.
- * Supports the block protection bits BP{0,1,2} in the status register
- * (SR). Does not support these features found in newer SR bitfields:
- * - SEC: sector/block protect - only handle SEC=0 (block protect)
- * - CMP: complement protect - only support CMP=0 (range is not complemented)
- *
- * Support for the following is provided conditionally for some flash:
- * - TB: top/bottom protect
- *
- * Sample table portion for 8MB flash (Winbond w25q64fw):
- *
- * SEC | TB | BP2 | BP1 | BP0 | Prot Length | Protected Portion
- * --------------------------------------------------------------------------
- * X | X | 0 | 0 | 0 | NONE | NONE
- * 0 | 0 | 0 | 0 | 1 | 128 KB | Upper 1/64
- * 0 | 0 | 0 | 1 | 0 | 256 KB | Upper 1/32
- * 0 | 0 | 0 | 1 | 1 | 512 KB | Upper 1/16
- * 0 | 0 | 1 | 0 | 0 | 1 MB | Upper 1/8
- * 0 | 0 | 1 | 0 | 1 | 2 MB | Upper 1/4
- * 0 | 0 | 1 | 1 | 0 | 4 MB | Upper 1/2
- * X | X | 1 | 1 | 1 | 8 MB | ALL
- * ------|-------|-------|-------|-------|---------------|-------------------
- * 0 | 1 | 0 | 0 | 1 | 128 KB | Lower 1/64
- * 0 | 1 | 0 | 1 | 0 | 256 KB | Lower 1/32
- * 0 | 1 | 0 | 1 | 1 | 512 KB | Lower 1/16
- * 0 | 1 | 1 | 0 | 0 | 1 MB | Lower 1/8
- * 0 | 1 | 1 | 0 | 1 | 2 MB | Lower 1/4
- * 0 | 1 | 1 | 1 | 0 | 4 MB | Lower 1/2
- *
- * Returns negative on errors, 0 on success.
- */
- static int stm_lock(struct spi_nor *nor, loff_t ofs, uint64_t len)
- {
- struct mtd_info *mtd = &nor->mtd;
- int status_old, status_new;
- u8 mask = SR_BP2 | SR_BP1 | SR_BP0;
- u8 shift = ffs(mask) - 1, pow, val;
- loff_t lock_len;
- bool can_be_top = true, can_be_bottom = nor->flags & SNOR_F_HAS_SR_TB;
- bool use_top;
- status_old = read_sr(nor);
- if (status_old < 0)
- return status_old;
- /* If nothing in our range is unlocked, we don't need to do anything */
- if (stm_is_locked_sr(nor, ofs, len, status_old))
- return 0;
- /* If anything below us is unlocked, we can't use 'bottom' protection */
- if (!stm_is_locked_sr(nor, 0, ofs, status_old))
- can_be_bottom = false;
- /* If anything above us is unlocked, we can't use 'top' protection */
- if (!stm_is_locked_sr(nor, ofs + len, mtd->size - (ofs + len),
- status_old))
- can_be_top = false;
- if (!can_be_bottom && !can_be_top)
- return -EINVAL;
- /* Prefer top, if both are valid */
- use_top = can_be_top;
- /* lock_len: length of region that should end up locked */
- if (use_top)
- lock_len = mtd->size - ofs;
- else
- lock_len = ofs + len;
- /*
- * Need smallest pow such that:
- *
- * 1 / (2^pow) <= (len / size)
- *
- * so (assuming power-of-2 size) we do:
- *
- * pow = ceil(log2(size / len)) = log2(size) - floor(log2(len))
- */
- pow = ilog2(mtd->size) - ilog2(lock_len);
- val = mask - (pow << shift);
- if (val & ~mask)
- return -EINVAL;
- /* Don't "lock" with no region! */
- if (!(val & mask))
- return -EINVAL;
- status_new = (status_old & ~mask & ~SR_TB) | val;
- /* Disallow further writes if WP pin is asserted */
- status_new |= SR_SRWD;
- if (!use_top)
- status_new |= SR_TB;
- /* Don't bother if they're the same */
- if (status_new == status_old)
- return 0;
- /* Only modify protection if it will not unlock other areas */
- if ((status_new & mask) < (status_old & mask))
- return -EINVAL;
- return write_sr_and_check(nor, status_new, mask);
- }
- /*
- * Unlock a region of the flash. See stm_lock() for more info
- *
- * Returns negative on errors, 0 on success.
- */
- static int stm_unlock(struct spi_nor *nor, loff_t ofs, uint64_t len)
- {
- struct mtd_info *mtd = &nor->mtd;
- int status_old, status_new;
- u8 mask = SR_BP2 | SR_BP1 | SR_BP0;
- u8 shift = ffs(mask) - 1, pow, val;
- loff_t lock_len;
- bool can_be_top = true, can_be_bottom = nor->flags & SNOR_F_HAS_SR_TB;
- bool use_top;
- status_old = read_sr(nor);
- if (status_old < 0)
- return status_old;
- /* If nothing in our range is locked, we don't need to do anything */
- if (stm_is_unlocked_sr(nor, ofs, len, status_old))
- return 0;
- /* If anything below us is locked, we can't use 'top' protection */
- if (!stm_is_unlocked_sr(nor, 0, ofs, status_old))
- can_be_top = false;
- /* If anything above us is locked, we can't use 'bottom' protection */
- if (!stm_is_unlocked_sr(nor, ofs + len, mtd->size - (ofs + len),
- status_old))
- can_be_bottom = false;
- if (!can_be_bottom && !can_be_top)
- return -EINVAL;
- /* Prefer top, if both are valid */
- use_top = can_be_top;
- /* lock_len: length of region that should remain locked */
- if (use_top)
- lock_len = mtd->size - (ofs + len);
- else
- lock_len = ofs;
- /*
- * Need largest pow such that:
- *
- * 1 / (2^pow) >= (len / size)
- *
- * so (assuming power-of-2 size) we do:
- *
- * pow = floor(log2(size / len)) = log2(size) - ceil(log2(len))
- */
- pow = ilog2(mtd->size) - order_base_2(lock_len);
- if (lock_len == 0) {
- val = 0; /* fully unlocked */
- } else {
- val = mask - (pow << shift);
- /* Some power-of-two sizes are not supported */
- if (val & ~mask)
- return -EINVAL;
- }
- status_new = (status_old & ~mask & ~SR_TB) | val;
- /* Don't protect status register if we're fully unlocked */
- if (lock_len == 0)
- status_new &= ~SR_SRWD;
- if (!use_top)
- status_new |= SR_TB;
- /* Don't bother if they're the same */
- if (status_new == status_old)
- return 0;
- /* Only modify protection if it will not lock other areas */
- if ((status_new & mask) > (status_old & mask))
- return -EINVAL;
- return write_sr_and_check(nor, status_new, mask);
- }
- /*
- * Check if a region of the flash is (completely) locked. See stm_lock() for
- * more info.
- *
- * Returns 1 if entire region is locked, 0 if any portion is unlocked, and
- * negative on errors.
- */
- static int stm_is_locked(struct spi_nor *nor, loff_t ofs, uint64_t len)
- {
- int status;
- status = read_sr(nor);
- if (status < 0)
- return status;
- return stm_is_locked_sr(nor, ofs, len, status);
- }
- #endif /* CONFIG_SPI_FLASH_STMICRO */
- static const struct flash_info *spi_nor_read_id(struct spi_nor *nor)
- {
- int tmp;
- u8 id[SPI_NOR_MAX_ID_LEN];
- const struct flash_info *info;
- tmp = nor->read_reg(nor, SPINOR_OP_RDID, id, SPI_NOR_MAX_ID_LEN);
- if (tmp < 0) {
- dev_dbg(nor->dev, "error %d reading JEDEC ID\n", tmp);
- return ERR_PTR(tmp);
- }
- info = spi_nor_ids;
- for (; info->name; info++) {
- if (info->id_len) {
- if (!memcmp(info->id, id, info->id_len))
- return info;
- }
- }
- dev_err(nor->dev, "unrecognized JEDEC id bytes: %02x, %02x, %02x\n",
- id[0], id[1], id[2]);
- return ERR_PTR(-ENODEV);
- }
- static int spi_nor_read(struct mtd_info *mtd, loff_t from, size_t len,
- size_t *retlen, u_char *buf)
- {
- struct spi_nor *nor = mtd_to_spi_nor(mtd);
- int ret;
- dev_dbg(nor->dev, "from 0x%08x, len %zd\n", (u32)from, len);
- while (len) {
- loff_t addr = from;
- size_t read_len = len;
- #ifdef CONFIG_SPI_FLASH_BAR
- u32 remain_len;
- ret = write_bar(nor, addr);
- if (ret < 0)
- return log_ret(ret);
- remain_len = (SZ_16M * (nor->bank_curr + 1)) - addr;
- if (len < remain_len)
- read_len = len;
- else
- read_len = remain_len;
- #endif
- ret = nor->read(nor, addr, read_len, buf);
- if (ret == 0) {
- /* We shouldn't see 0-length reads */
- ret = -EIO;
- goto read_err;
- }
- if (ret < 0)
- goto read_err;
- *retlen += ret;
- buf += ret;
- from += ret;
- len -= ret;
- }
- ret = 0;
- read_err:
- #ifdef CONFIG_SPI_FLASH_BAR
- ret = clean_bar(nor);
- #endif
- return ret;
- }
- #ifdef CONFIG_SPI_FLASH_SST
- /*
- * sst26 flash series has its own block protection implementation:
- * 4x - 8 KByte blocks - read & write protection bits - upper addresses
- * 1x - 32 KByte blocks - write protection bits
- * rest - 64 KByte blocks - write protection bits
- * 1x - 32 KByte blocks - write protection bits
- * 4x - 8 KByte blocks - read & write protection bits - lower addresses
- *
- * We'll support only per 64k lock/unlock so lower and upper 64 KByte region
- * will be treated as single block.
- */
- #define SST26_BPR_8K_NUM 4
- #define SST26_MAX_BPR_REG_LEN (18 + 1)
- #define SST26_BOUND_REG_SIZE ((32 + SST26_BPR_8K_NUM * 8) * SZ_1K)
- enum lock_ctl {
- SST26_CTL_LOCK,
- SST26_CTL_UNLOCK,
- SST26_CTL_CHECK
- };
- static bool sst26_process_bpr(u32 bpr_size, u8 *cmd, u32 bit, enum lock_ctl ctl)
- {
- switch (ctl) {
- case SST26_CTL_LOCK:
- cmd[bpr_size - (bit / 8) - 1] |= BIT(bit % 8);
- break;
- case SST26_CTL_UNLOCK:
- cmd[bpr_size - (bit / 8) - 1] &= ~BIT(bit % 8);
- break;
- case SST26_CTL_CHECK:
- return !!(cmd[bpr_size - (bit / 8) - 1] & BIT(bit % 8));
- }
- return false;
- }
- /*
- * Lock, unlock or check lock status of the flash region of the flash (depending
- * on the lock_ctl value)
- */
- static int sst26_lock_ctl(struct spi_nor *nor, loff_t ofs, uint64_t len, enum lock_ctl ctl)
- {
- struct mtd_info *mtd = &nor->mtd;
- u32 i, bpr_ptr, rptr_64k, lptr_64k, bpr_size;
- bool lower_64k = false, upper_64k = false;
- u8 bpr_buff[SST26_MAX_BPR_REG_LEN] = {};
- int ret;
- /* Check length and offset for 64k alignment */
- if ((ofs & (SZ_64K - 1)) || (len & (SZ_64K - 1))) {
- dev_err(nor->dev, "length or offset is not 64KiB allighned\n");
- return -EINVAL;
- }
- if (ofs + len > mtd->size) {
- dev_err(nor->dev, "range is more than device size: %#llx + %#llx > %#llx\n",
- ofs, len, mtd->size);
- return -EINVAL;
- }
- /* SST26 family has only 16 Mbit, 32 Mbit and 64 Mbit IC */
- if (mtd->size != SZ_2M &&
- mtd->size != SZ_4M &&
- mtd->size != SZ_8M)
- return -EINVAL;
- bpr_size = 2 + (mtd->size / SZ_64K / 8);
- ret = nor->read_reg(nor, SPINOR_OP_READ_BPR, bpr_buff, bpr_size);
- if (ret < 0) {
- dev_err(nor->dev, "fail to read block-protection register\n");
- return ret;
- }
- rptr_64k = min_t(u32, ofs + len, mtd->size - SST26_BOUND_REG_SIZE);
- lptr_64k = max_t(u32, ofs, SST26_BOUND_REG_SIZE);
- upper_64k = ((ofs + len) > (mtd->size - SST26_BOUND_REG_SIZE));
- lower_64k = (ofs < SST26_BOUND_REG_SIZE);
- /* Lower bits in block-protection register are about 64k region */
- bpr_ptr = lptr_64k / SZ_64K - 1;
- /* Process 64K blocks region */
- while (lptr_64k < rptr_64k) {
- if (sst26_process_bpr(bpr_size, bpr_buff, bpr_ptr, ctl))
- return EACCES;
- bpr_ptr++;
- lptr_64k += SZ_64K;
- }
- /* 32K and 8K region bits in BPR are after 64k region bits */
- bpr_ptr = (mtd->size - 2 * SST26_BOUND_REG_SIZE) / SZ_64K;
- /* Process lower 32K block region */
- if (lower_64k)
- if (sst26_process_bpr(bpr_size, bpr_buff, bpr_ptr, ctl))
- return EACCES;
- bpr_ptr++;
- /* Process upper 32K block region */
- if (upper_64k)
- if (sst26_process_bpr(bpr_size, bpr_buff, bpr_ptr, ctl))
- return EACCES;
- bpr_ptr++;
- /* Process lower 8K block regions */
- for (i = 0; i < SST26_BPR_8K_NUM; i++) {
- if (lower_64k)
- if (sst26_process_bpr(bpr_size, bpr_buff, bpr_ptr, ctl))
- return EACCES;
- /* In 8K area BPR has both read and write protection bits */
- bpr_ptr += 2;
- }
- /* Process upper 8K block regions */
- for (i = 0; i < SST26_BPR_8K_NUM; i++) {
- if (upper_64k)
- if (sst26_process_bpr(bpr_size, bpr_buff, bpr_ptr, ctl))
- return EACCES;
- /* In 8K area BPR has both read and write protection bits */
- bpr_ptr += 2;
- }
- /* If we check region status we don't need to write BPR back */
- if (ctl == SST26_CTL_CHECK)
- return 0;
- ret = nor->write_reg(nor, SPINOR_OP_WRITE_BPR, bpr_buff, bpr_size);
- if (ret < 0) {
- dev_err(nor->dev, "fail to write block-protection register\n");
- return ret;
- }
- return 0;
- }
- static int sst26_unlock(struct spi_nor *nor, loff_t ofs, uint64_t len)
- {
- return sst26_lock_ctl(nor, ofs, len, SST26_CTL_UNLOCK);
- }
- static int sst26_lock(struct spi_nor *nor, loff_t ofs, uint64_t len)
- {
- return sst26_lock_ctl(nor, ofs, len, SST26_CTL_LOCK);
- }
- /*
- * Returns EACCES (positive value) if region is locked, 0 if region is unlocked,
- * and negative on errors.
- */
- static int sst26_is_locked(struct spi_nor *nor, loff_t ofs, uint64_t len)
- {
- /*
- * is_locked function is used for check before reading or erasing flash
- * region, so offset and length might be not 64k allighned, so adjust
- * them to be 64k allighned as sst26_lock_ctl works only with 64k
- * allighned regions.
- */
- ofs -= ofs & (SZ_64K - 1);
- len = len & (SZ_64K - 1) ? (len & ~(SZ_64K - 1)) + SZ_64K : len;
- return sst26_lock_ctl(nor, ofs, len, SST26_CTL_CHECK);
- }
- static int sst_write_byteprogram(struct spi_nor *nor, loff_t to, size_t len,
- size_t *retlen, const u_char *buf)
- {
- size_t actual;
- int ret = 0;
- for (actual = 0; actual < len; actual++) {
- nor->program_opcode = SPINOR_OP_BP;
- write_enable(nor);
- /* write one byte. */
- ret = nor->write(nor, to, 1, buf + actual);
- if (ret < 0)
- goto sst_write_err;
- ret = spi_nor_wait_till_ready(nor);
- if (ret)
- goto sst_write_err;
- to++;
- }
- sst_write_err:
- write_disable(nor);
- return ret;
- }
- static int sst_write(struct mtd_info *mtd, loff_t to, size_t len,
- size_t *retlen, const u_char *buf)
- {
- struct spi_nor *nor = mtd_to_spi_nor(mtd);
- struct spi_slave *spi = nor->spi;
- size_t actual;
- int ret;
- dev_dbg(nor->dev, "to 0x%08x, len %zd\n", (u32)to, len);
- if (spi->mode & SPI_TX_BYTE)
- return sst_write_byteprogram(nor, to, len, retlen, buf);
- write_enable(nor);
- nor->sst_write_second = false;
- actual = to % 2;
- /* Start write from odd address. */
- if (actual) {
- nor->program_opcode = SPINOR_OP_BP;
- /* write one byte. */
- ret = nor->write(nor, to, 1, buf);
- if (ret < 0)
- goto sst_write_err;
- ret = spi_nor_wait_till_ready(nor);
- if (ret)
- goto sst_write_err;
- }
- to += actual;
- /* Write out most of the data here. */
- for (; actual < len - 1; actual += 2) {
- nor->program_opcode = SPINOR_OP_AAI_WP;
- /* write two bytes. */
- ret = nor->write(nor, to, 2, buf + actual);
- if (ret < 0)
- goto sst_write_err;
- ret = spi_nor_wait_till_ready(nor);
- if (ret)
- goto sst_write_err;
- to += 2;
- nor->sst_write_second = true;
- }
- nor->sst_write_second = false;
- write_disable(nor);
- ret = spi_nor_wait_till_ready(nor);
- if (ret)
- goto sst_write_err;
- /* Write out trailing byte if it exists. */
- if (actual != len) {
- write_enable(nor);
- nor->program_opcode = SPINOR_OP_BP;
- ret = nor->write(nor, to, 1, buf + actual);
- if (ret < 0)
- goto sst_write_err;
- ret = spi_nor_wait_till_ready(nor);
- if (ret)
- goto sst_write_err;
- write_disable(nor);
- actual += 1;
- }
- sst_write_err:
- *retlen += actual;
- return ret;
- }
- #endif
- /*
- * Write an address range to the nor chip. Data must be written in
- * FLASH_PAGESIZE chunks. The address range may be any size provided
- * it is within the physical boundaries.
- */
- static int spi_nor_write(struct mtd_info *mtd, loff_t to, size_t len,
- size_t *retlen, const u_char *buf)
- {
- struct spi_nor *nor = mtd_to_spi_nor(mtd);
- size_t page_offset, page_remain, i;
- ssize_t ret;
- dev_dbg(nor->dev, "to 0x%08x, len %zd\n", (u32)to, len);
- if (!len)
- return 0;
- for (i = 0; i < len; ) {
- ssize_t written;
- loff_t addr = to + i;
- /*
- * If page_size is a power of two, the offset can be quickly
- * calculated with an AND operation. On the other cases we
- * need to do a modulus operation (more expensive).
- */
- if (is_power_of_2(nor->page_size)) {
- page_offset = addr & (nor->page_size - 1);
- } else {
- u64 aux = addr;
- page_offset = do_div(aux, nor->page_size);
- }
- /* the size of data remaining on the first page */
- page_remain = min_t(size_t,
- nor->page_size - page_offset, len - i);
- #ifdef CONFIG_SPI_FLASH_BAR
- ret = write_bar(nor, addr);
- if (ret < 0)
- return ret;
- #endif
- write_enable(nor);
- ret = nor->write(nor, addr, page_remain, buf + i);
- if (ret < 0)
- goto write_err;
- written = ret;
- ret = spi_nor_wait_till_ready(nor);
- if (ret)
- goto write_err;
- *retlen += written;
- i += written;
- }
- write_err:
- #ifdef CONFIG_SPI_FLASH_BAR
- ret = clean_bar(nor);
- #endif
- return ret;
- }
- #ifdef CONFIG_SPI_FLASH_MACRONIX
- /**
- * macronix_quad_enable() - set QE bit in Status Register.
- * @nor: pointer to a 'struct spi_nor'
- *
- * Set the Quad Enable (QE) bit in the Status Register.
- *
- * bit 6 of the Status Register is the QE bit for Macronix like QSPI memories.
- *
- * Return: 0 on success, -errno otherwise.
- */
- static int macronix_quad_enable(struct spi_nor *nor)
- {
- int ret, val;
- val = read_sr(nor);
- if (val < 0)
- return val;
- if (val & SR_QUAD_EN_MX)
- return 0;
- write_enable(nor);
- write_sr(nor, val | SR_QUAD_EN_MX);
- ret = spi_nor_wait_till_ready(nor);
- if (ret)
- return ret;
- ret = read_sr(nor);
- if (!(ret > 0 && (ret & SR_QUAD_EN_MX))) {
- dev_err(nor->dev, "Macronix Quad bit not set\n");
- return -EINVAL;
- }
- return 0;
- }
- #endif
- #if defined(CONFIG_SPI_FLASH_SPANSION) || defined(CONFIG_SPI_FLASH_WINBOND)
- /*
- * Write status Register and configuration register with 2 bytes
- * The first byte will be written to the status register, while the
- * second byte will be written to the configuration register.
- * Return negative if error occurred.
- */
- static int write_sr_cr(struct spi_nor *nor, u8 *sr_cr)
- {
- int ret;
- write_enable(nor);
- ret = nor->write_reg(nor, SPINOR_OP_WRSR, sr_cr, 2);
- if (ret < 0) {
- dev_dbg(nor->dev,
- "error while writing configuration register\n");
- return -EINVAL;
- }
- ret = spi_nor_wait_till_ready(nor);
- if (ret) {
- dev_dbg(nor->dev,
- "timeout while writing configuration register\n");
- return ret;
- }
- return 0;
- }
- /**
- * spansion_read_cr_quad_enable() - set QE bit in Configuration Register.
- * @nor: pointer to a 'struct spi_nor'
- *
- * Set the Quad Enable (QE) bit in the Configuration Register.
- * This function should be used with QSPI memories supporting the Read
- * Configuration Register (35h) instruction.
- *
- * bit 1 of the Configuration Register is the QE bit for Spansion like QSPI
- * memories.
- *
- * Return: 0 on success, -errno otherwise.
- */
- static int spansion_read_cr_quad_enable(struct spi_nor *nor)
- {
- u8 sr_cr[2];
- int ret;
- /* Check current Quad Enable bit value. */
- ret = read_cr(nor);
- if (ret < 0) {
- dev_dbg(dev, "error while reading configuration register\n");
- return -EINVAL;
- }
- if (ret & CR_QUAD_EN_SPAN)
- return 0;
- sr_cr[1] = ret | CR_QUAD_EN_SPAN;
- /* Keep the current value of the Status Register. */
- ret = read_sr(nor);
- if (ret < 0) {
- dev_dbg(dev, "error while reading status register\n");
- return -EINVAL;
- }
- sr_cr[0] = ret;
- ret = write_sr_cr(nor, sr_cr);
- if (ret)
- return ret;
- /* Read back and check it. */
- ret = read_cr(nor);
- if (!(ret > 0 && (ret & CR_QUAD_EN_SPAN))) {
- dev_dbg(nor->dev, "Spansion Quad bit not set\n");
- return -EINVAL;
- }
- return 0;
- }
- #if CONFIG_IS_ENABLED(SPI_FLASH_SFDP_SUPPORT)
- /**
- * spansion_no_read_cr_quad_enable() - set QE bit in Configuration Register.
- * @nor: pointer to a 'struct spi_nor'
- *
- * Set the Quad Enable (QE) bit in the Configuration Register.
- * This function should be used with QSPI memories not supporting the Read
- * Configuration Register (35h) instruction.
- *
- * bit 1 of the Configuration Register is the QE bit for Spansion like QSPI
- * memories.
- *
- * Return: 0 on success, -errno otherwise.
- */
- static int spansion_no_read_cr_quad_enable(struct spi_nor *nor)
- {
- u8 sr_cr[2];
- int ret;
- /* Keep the current value of the Status Register. */
- ret = read_sr(nor);
- if (ret < 0) {
- dev_dbg(nor->dev, "error while reading status register\n");
- return -EINVAL;
- }
- sr_cr[0] = ret;
- sr_cr[1] = CR_QUAD_EN_SPAN;
- return write_sr_cr(nor, sr_cr);
- }
- #endif /* CONFIG_SPI_FLASH_SFDP_SUPPORT */
- #endif /* CONFIG_SPI_FLASH_SPANSION */
- struct spi_nor_read_command {
- u8 num_mode_clocks;
- u8 num_wait_states;
- u8 opcode;
- enum spi_nor_protocol proto;
- };
- struct spi_nor_pp_command {
- u8 opcode;
- enum spi_nor_protocol proto;
- };
- enum spi_nor_read_command_index {
- SNOR_CMD_READ,
- SNOR_CMD_READ_FAST,
- SNOR_CMD_READ_1_1_1_DTR,
- /* Dual SPI */
- SNOR_CMD_READ_1_1_2,
- SNOR_CMD_READ_1_2_2,
- SNOR_CMD_READ_2_2_2,
- SNOR_CMD_READ_1_2_2_DTR,
- /* Quad SPI */
- SNOR_CMD_READ_1_1_4,
- SNOR_CMD_READ_1_4_4,
- SNOR_CMD_READ_4_4_4,
- SNOR_CMD_READ_1_4_4_DTR,
- /* Octo SPI */
- SNOR_CMD_READ_1_1_8,
- SNOR_CMD_READ_1_8_8,
- SNOR_CMD_READ_8_8_8,
- SNOR_CMD_READ_1_8_8_DTR,
- SNOR_CMD_READ_MAX
- };
- enum spi_nor_pp_command_index {
- SNOR_CMD_PP,
- /* Quad SPI */
- SNOR_CMD_PP_1_1_4,
- SNOR_CMD_PP_1_4_4,
- SNOR_CMD_PP_4_4_4,
- /* Octo SPI */
- SNOR_CMD_PP_1_1_8,
- SNOR_CMD_PP_1_8_8,
- SNOR_CMD_PP_8_8_8,
- SNOR_CMD_PP_MAX
- };
- struct spi_nor_flash_parameter {
- u64 size;
- u32 page_size;
- struct spi_nor_hwcaps hwcaps;
- struct spi_nor_read_command reads[SNOR_CMD_READ_MAX];
- struct spi_nor_pp_command page_programs[SNOR_CMD_PP_MAX];
- int (*quad_enable)(struct spi_nor *nor);
- };
- static void
- spi_nor_set_read_settings(struct spi_nor_read_command *read,
- u8 num_mode_clocks,
- u8 num_wait_states,
- u8 opcode,
- enum spi_nor_protocol proto)
- {
- read->num_mode_clocks = num_mode_clocks;
- read->num_wait_states = num_wait_states;
- read->opcode = opcode;
- read->proto = proto;
- }
- static void
- spi_nor_set_pp_settings(struct spi_nor_pp_command *pp,
- u8 opcode,
- enum spi_nor_protocol proto)
- {
- pp->opcode = opcode;
- pp->proto = proto;
- }
- #if CONFIG_IS_ENABLED(SPI_FLASH_SFDP_SUPPORT)
- /*
- * Serial Flash Discoverable Parameters (SFDP) parsing.
- */
- /**
- * spi_nor_read_sfdp() - read Serial Flash Discoverable Parameters.
- * @nor: pointer to a 'struct spi_nor'
- * @addr: offset in the SFDP area to start reading data from
- * @len: number of bytes to read
- * @buf: buffer where the SFDP data are copied into (dma-safe memory)
- *
- * Whatever the actual numbers of bytes for address and dummy cycles are
- * for (Fast) Read commands, the Read SFDP (5Ah) instruction is always
- * followed by a 3-byte address and 8 dummy clock cycles.
- *
- * Return: 0 on success, -errno otherwise.
- */
- static int spi_nor_read_sfdp(struct spi_nor *nor, u32 addr,
- size_t len, void *buf)
- {
- u8 addr_width, read_opcode, read_dummy;
- int ret;
- read_opcode = nor->read_opcode;
- addr_width = nor->addr_width;
- read_dummy = nor->read_dummy;
- nor->read_opcode = SPINOR_OP_RDSFDP;
- nor->addr_width = 3;
- nor->read_dummy = 8;
- while (len) {
- ret = nor->read(nor, addr, len, (u8 *)buf);
- if (!ret || ret > len) {
- ret = -EIO;
- goto read_err;
- }
- if (ret < 0)
- goto read_err;
- buf += ret;
- addr += ret;
- len -= ret;
- }
- ret = 0;
- read_err:
- nor->read_opcode = read_opcode;
- nor->addr_width = addr_width;
- nor->read_dummy = read_dummy;
- return ret;
- }
- struct sfdp_parameter_header {
- u8 id_lsb;
- u8 minor;
- u8 major;
- u8 length; /* in double words */
- u8 parameter_table_pointer[3]; /* byte address */
- u8 id_msb;
- };
- #define SFDP_PARAM_HEADER_ID(p) (((p)->id_msb << 8) | (p)->id_lsb)
- #define SFDP_PARAM_HEADER_PTP(p) \
- (((p)->parameter_table_pointer[2] << 16) | \
- ((p)->parameter_table_pointer[1] << 8) | \
- ((p)->parameter_table_pointer[0] << 0))
- #define SFDP_BFPT_ID 0xff00 /* Basic Flash Parameter Table */
- #define SFDP_SECTOR_MAP_ID 0xff81 /* Sector Map Table */
- #define SFDP_SST_ID 0x01bf /* Manufacturer specific Table */
- #define SFDP_SIGNATURE 0x50444653U
- #define SFDP_JESD216_MAJOR 1
- #define SFDP_JESD216_MINOR 0
- #define SFDP_JESD216A_MINOR 5
- #define SFDP_JESD216B_MINOR 6
- struct sfdp_header {
- u32 signature; /* Ox50444653U <=> "SFDP" */
- u8 minor;
- u8 major;
- u8 nph; /* 0-base number of parameter headers */
- u8 unused;
- /* Basic Flash Parameter Table. */
- struct sfdp_parameter_header bfpt_header;
- };
- /* Basic Flash Parameter Table */
- /*
- * JESD216 rev B defines a Basic Flash Parameter Table of 16 DWORDs.
- * They are indexed from 1 but C arrays are indexed from 0.
- */
- #define BFPT_DWORD(i) ((i) - 1)
- #define BFPT_DWORD_MAX 16
- /* The first version of JESB216 defined only 9 DWORDs. */
- #define BFPT_DWORD_MAX_JESD216 9
- /* 1st DWORD. */
- #define BFPT_DWORD1_FAST_READ_1_1_2 BIT(16)
- #define BFPT_DWORD1_ADDRESS_BYTES_MASK GENMASK(18, 17)
- #define BFPT_DWORD1_ADDRESS_BYTES_3_ONLY (0x0UL << 17)
- #define BFPT_DWORD1_ADDRESS_BYTES_3_OR_4 (0x1UL << 17)
- #define BFPT_DWORD1_ADDRESS_BYTES_4_ONLY (0x2UL << 17)
- #define BFPT_DWORD1_DTR BIT(19)
- #define BFPT_DWORD1_FAST_READ_1_2_2 BIT(20)
- #define BFPT_DWORD1_FAST_READ_1_4_4 BIT(21)
- #define BFPT_DWORD1_FAST_READ_1_1_4 BIT(22)
- /* 5th DWORD. */
- #define BFPT_DWORD5_FAST_READ_2_2_2 BIT(0)
- #define BFPT_DWORD5_FAST_READ_4_4_4 BIT(4)
- /* 11th DWORD. */
- #define BFPT_DWORD11_PAGE_SIZE_SHIFT 4
- #define BFPT_DWORD11_PAGE_SIZE_MASK GENMASK(7, 4)
- /* 15th DWORD. */
- /*
- * (from JESD216 rev B)
- * Quad Enable Requirements (QER):
- * - 000b: Device does not have a QE bit. Device detects 1-1-4 and 1-4-4
- * reads based on instruction. DQ3/HOLD# functions are hold during
- * instruction phase.
- * - 001b: QE is bit 1 of status register 2. It is set via Write Status with
- * two data bytes where bit 1 of the second byte is one.
- * [...]
- * Writing only one byte to the status register has the side-effect of
- * clearing status register 2, including the QE bit. The 100b code is
- * used if writing one byte to the status register does not modify
- * status register 2.
- * - 010b: QE is bit 6 of status register 1. It is set via Write Status with
- * one data byte where bit 6 is one.
- * [...]
- * - 011b: QE is bit 7 of status register 2. It is set via Write status
- * register 2 instruction 3Eh with one data byte where bit 7 is one.
- * [...]
- * The status register 2 is read using instruction 3Fh.
- * - 100b: QE is bit 1 of status register 2. It is set via Write Status with
- * two data bytes where bit 1 of the second byte is one.
- * [...]
- * In contrast to the 001b code, writing one byte to the status
- * register does not modify status register 2.
- * - 101b: QE is bit 1 of status register 2. Status register 1 is read using
- * Read Status instruction 05h. Status register2 is read using
- * instruction 35h. QE is set via Writ Status instruction 01h with
- * two data bytes where bit 1 of the second byte is one.
- * [...]
- */
- #define BFPT_DWORD15_QER_MASK GENMASK(22, 20)
- #define BFPT_DWORD15_QER_NONE (0x0UL << 20) /* Micron */
- #define BFPT_DWORD15_QER_SR2_BIT1_BUGGY (0x1UL << 20)
- #define BFPT_DWORD15_QER_SR1_BIT6 (0x2UL << 20) /* Macronix */
- #define BFPT_DWORD15_QER_SR2_BIT7 (0x3UL << 20)
- #define BFPT_DWORD15_QER_SR2_BIT1_NO_RD (0x4UL << 20)
- #define BFPT_DWORD15_QER_SR2_BIT1 (0x5UL << 20) /* Spansion */
- struct sfdp_bfpt {
- u32 dwords[BFPT_DWORD_MAX];
- };
- /* Fast Read settings. */
- static void
- spi_nor_set_read_settings_from_bfpt(struct spi_nor_read_command *read,
- u16 half,
- enum spi_nor_protocol proto)
- {
- read->num_mode_clocks = (half >> 5) & 0x07;
- read->num_wait_states = (half >> 0) & 0x1f;
- read->opcode = (half >> 8) & 0xff;
- read->proto = proto;
- }
- struct sfdp_bfpt_read {
- /* The Fast Read x-y-z hardware capability in params->hwcaps.mask. */
- u32 hwcaps;
- /*
- * The <supported_bit> bit in <supported_dword> BFPT DWORD tells us
- * whether the Fast Read x-y-z command is supported.
- */
- u32 supported_dword;
- u32 supported_bit;
- /*
- * The half-word at offset <setting_shift> in <setting_dword> BFPT DWORD
- * encodes the op code, the number of mode clocks and the number of wait
- * states to be used by Fast Read x-y-z command.
- */
- u32 settings_dword;
- u32 settings_shift;
- /* The SPI protocol for this Fast Read x-y-z command. */
- enum spi_nor_protocol proto;
- };
- static const struct sfdp_bfpt_read sfdp_bfpt_reads[] = {
- /* Fast Read 1-1-2 */
- {
- SNOR_HWCAPS_READ_1_1_2,
- BFPT_DWORD(1), BIT(16), /* Supported bit */
- BFPT_DWORD(4), 0, /* Settings */
- SNOR_PROTO_1_1_2,
- },
- /* Fast Read 1-2-2 */
- {
- SNOR_HWCAPS_READ_1_2_2,
- BFPT_DWORD(1), BIT(20), /* Supported bit */
- BFPT_DWORD(4), 16, /* Settings */
- SNOR_PROTO_1_2_2,
- },
- /* Fast Read 2-2-2 */
- {
- SNOR_HWCAPS_READ_2_2_2,
- BFPT_DWORD(5), BIT(0), /* Supported bit */
- BFPT_DWORD(6), 16, /* Settings */
- SNOR_PROTO_2_2_2,
- },
- /* Fast Read 1-1-4 */
- {
- SNOR_HWCAPS_READ_1_1_4,
- BFPT_DWORD(1), BIT(22), /* Supported bit */
- BFPT_DWORD(3), 16, /* Settings */
- SNOR_PROTO_1_1_4,
- },
- /* Fast Read 1-4-4 */
- {
- SNOR_HWCAPS_READ_1_4_4,
- BFPT_DWORD(1), BIT(21), /* Supported bit */
- BFPT_DWORD(3), 0, /* Settings */
- SNOR_PROTO_1_4_4,
- },
- /* Fast Read 4-4-4 */
- {
- SNOR_HWCAPS_READ_4_4_4,
- BFPT_DWORD(5), BIT(4), /* Supported bit */
- BFPT_DWORD(7), 16, /* Settings */
- SNOR_PROTO_4_4_4,
- },
- };
- struct sfdp_bfpt_erase {
- /*
- * The half-word at offset <shift> in DWORD <dwoard> encodes the
- * op code and erase sector size to be used by Sector Erase commands.
- */
- u32 dword;
- u32 shift;
- };
- static const struct sfdp_bfpt_erase sfdp_bfpt_erases[] = {
- /* Erase Type 1 in DWORD8 bits[15:0] */
- {BFPT_DWORD(8), 0},
- /* Erase Type 2 in DWORD8 bits[31:16] */
- {BFPT_DWORD(8), 16},
- /* Erase Type 3 in DWORD9 bits[15:0] */
- {BFPT_DWORD(9), 0},
- /* Erase Type 4 in DWORD9 bits[31:16] */
- {BFPT_DWORD(9), 16},
- };
- static int spi_nor_hwcaps_read2cmd(u32 hwcaps);
- /**
- * spi_nor_parse_bfpt() - read and parse the Basic Flash Parameter Table.
- * @nor: pointer to a 'struct spi_nor'
- * @bfpt_header: pointer to the 'struct sfdp_parameter_header' describing
- * the Basic Flash Parameter Table length and version
- * @params: pointer to the 'struct spi_nor_flash_parameter' to be
- * filled
- *
- * The Basic Flash Parameter Table is the main and only mandatory table as
- * defined by the SFDP (JESD216) specification.
- * It provides us with the total size (memory density) of the data array and
- * the number of address bytes for Fast Read, Page Program and Sector Erase
- * commands.
- * For Fast READ commands, it also gives the number of mode clock cycles and
- * wait states (regrouped in the number of dummy clock cycles) for each
- * supported instruction op code.
- * For Page Program, the page size is now available since JESD216 rev A, however
- * the supported instruction op codes are still not provided.
- * For Sector Erase commands, this table stores the supported instruction op
- * codes and the associated sector sizes.
- * Finally, the Quad Enable Requirements (QER) are also available since JESD216
- * rev A. The QER bits encode the manufacturer dependent procedure to be
- * executed to set the Quad Enable (QE) bit in some internal register of the
- * Quad SPI memory. Indeed the QE bit, when it exists, must be set before
- * sending any Quad SPI command to the memory. Actually, setting the QE bit
- * tells the memory to reassign its WP# and HOLD#/RESET# pins to functions IO2
- * and IO3 hence enabling 4 (Quad) I/O lines.
- *
- * Return: 0 on success, -errno otherwise.
- */
- static int spi_nor_parse_bfpt(struct spi_nor *nor,
- const struct sfdp_parameter_header *bfpt_header,
- struct spi_nor_flash_parameter *params)
- {
- struct mtd_info *mtd = &nor->mtd;
- struct sfdp_bfpt bfpt;
- size_t len;
- int i, cmd, err;
- u32 addr;
- u16 half;
- /* JESD216 Basic Flash Parameter Table length is at least 9 DWORDs. */
- if (bfpt_header->length < BFPT_DWORD_MAX_JESD216)
- return -EINVAL;
- /* Read the Basic Flash Parameter Table. */
- len = min_t(size_t, sizeof(bfpt),
- bfpt_header->length * sizeof(u32));
- addr = SFDP_PARAM_HEADER_PTP(bfpt_header);
- memset(&bfpt, 0, sizeof(bfpt));
- err = spi_nor_read_sfdp(nor, addr, len, &bfpt);
- if (err < 0)
- return err;
- /* Fix endianness of the BFPT DWORDs. */
- for (i = 0; i < BFPT_DWORD_MAX; i++)
- bfpt.dwords[i] = le32_to_cpu(bfpt.dwords[i]);
- /* Number of address bytes. */
- switch (bfpt.dwords[BFPT_DWORD(1)] & BFPT_DWORD1_ADDRESS_BYTES_MASK) {
- case BFPT_DWORD1_ADDRESS_BYTES_3_ONLY:
- nor->addr_width = 3;
- break;
- case BFPT_DWORD1_ADDRESS_BYTES_4_ONLY:
- nor->addr_width = 4;
- break;
- default:
- break;
- }
- /* Flash Memory Density (in bits). */
- params->size = bfpt.dwords[BFPT_DWORD(2)];
- if (params->size & BIT(31)) {
- params->size &= ~BIT(31);
- /*
- * Prevent overflows on params->size. Anyway, a NOR of 2^64
- * bits is unlikely to exist so this error probably means
- * the BFPT we are reading is corrupted/wrong.
- */
- if (params->size > 63)
- return -EINVAL;
- params->size = 1ULL << params->size;
- } else {
- params->size++;
- }
- params->size >>= 3; /* Convert to bytes. */
- /* Fast Read settings. */
- for (i = 0; i < ARRAY_SIZE(sfdp_bfpt_reads); i++) {
- const struct sfdp_bfpt_read *rd = &sfdp_bfpt_reads[i];
- struct spi_nor_read_command *read;
- if (!(bfpt.dwords[rd->supported_dword] & rd->supported_bit)) {
- params->hwcaps.mask &= ~rd->hwcaps;
- continue;
- }
- params->hwcaps.mask |= rd->hwcaps;
- cmd = spi_nor_hwcaps_read2cmd(rd->hwcaps);
- read = ¶ms->reads[cmd];
- half = bfpt.dwords[rd->settings_dword] >> rd->settings_shift;
- spi_nor_set_read_settings_from_bfpt(read, half, rd->proto);
- }
- /* Sector Erase settings. */
- for (i = 0; i < ARRAY_SIZE(sfdp_bfpt_erases); i++) {
- const struct sfdp_bfpt_erase *er = &sfdp_bfpt_erases[i];
- u32 erasesize;
- u8 opcode;
- half = bfpt.dwords[er->dword] >> er->shift;
- erasesize = half & 0xff;
- /* erasesize == 0 means this Erase Type is not supported. */
- if (!erasesize)
- continue;
- erasesize = 1U << erasesize;
- opcode = (half >> 8) & 0xff;
- #ifdef CONFIG_SPI_FLASH_USE_4K_SECTORS
- if (erasesize == SZ_4K) {
- nor->erase_opcode = opcode;
- mtd->erasesize = erasesize;
- break;
- }
- #endif
- if (!mtd->erasesize || mtd->erasesize < erasesize) {
- nor->erase_opcode = opcode;
- mtd->erasesize = erasesize;
- }
- }
- /* Stop here if not JESD216 rev A or later. */
- if (bfpt_header->length < BFPT_DWORD_MAX)
- return 0;
- /* Page size: this field specifies 'N' so the page size = 2^N bytes. */
- params->page_size = bfpt.dwords[BFPT_DWORD(11)];
- params->page_size &= BFPT_DWORD11_PAGE_SIZE_MASK;
- params->page_size >>= BFPT_DWORD11_PAGE_SIZE_SHIFT;
- params->page_size = 1U << params->page_size;
- /* Quad Enable Requirements. */
- switch (bfpt.dwords[BFPT_DWORD(15)] & BFPT_DWORD15_QER_MASK) {
- case BFPT_DWORD15_QER_NONE:
- params->quad_enable = NULL;
- break;
- #if defined(CONFIG_SPI_FLASH_SPANSION) || defined(CONFIG_SPI_FLASH_WINBOND)
- case BFPT_DWORD15_QER_SR2_BIT1_BUGGY:
- case BFPT_DWORD15_QER_SR2_BIT1_NO_RD:
- params->quad_enable = spansion_no_read_cr_quad_enable;
- break;
- #endif
- #ifdef CONFIG_SPI_FLASH_MACRONIX
- case BFPT_DWORD15_QER_SR1_BIT6:
- params->quad_enable = macronix_quad_enable;
- break;
- #endif
- #if defined(CONFIG_SPI_FLASH_SPANSION) || defined(CONFIG_SPI_FLASH_WINBOND)
- case BFPT_DWORD15_QER_SR2_BIT1:
- params->quad_enable = spansion_read_cr_quad_enable;
- break;
- #endif
- default:
- return -EINVAL;
- }
- return 0;
- }
- /**
- * spi_nor_parse_microchip_sfdp() - parse the Microchip manufacturer specific
- * SFDP table.
- * @nor: pointer to a 'struct spi_nor'.
- * @param_header: pointer to the SFDP parameter header.
- *
- * Return: 0 on success, -errno otherwise.
- */
- static int
- spi_nor_parse_microchip_sfdp(struct spi_nor *nor,
- const struct sfdp_parameter_header *param_header)
- {
- size_t size;
- u32 addr;
- int ret;
- size = param_header->length * sizeof(u32);
- addr = SFDP_PARAM_HEADER_PTP(param_header);
- nor->manufacturer_sfdp = devm_kmalloc(nor->dev, size, GFP_KERNEL);
- if (!nor->manufacturer_sfdp)
- return -ENOMEM;
- ret = spi_nor_read_sfdp(nor, addr, size, nor->manufacturer_sfdp);
- return ret;
- }
- /**
- * spi_nor_parse_sfdp() - parse the Serial Flash Discoverable Parameters.
- * @nor: pointer to a 'struct spi_nor'
- * @params: pointer to the 'struct spi_nor_flash_parameter' to be
- * filled
- *
- * The Serial Flash Discoverable Parameters are described by the JEDEC JESD216
- * specification. This is a standard which tends to supported by almost all
- * (Q)SPI memory manufacturers. Those hard-coded tables allow us to learn at
- * runtime the main parameters needed to perform basic SPI flash operations such
- * as Fast Read, Page Program or Sector Erase commands.
- *
- * Return: 0 on success, -errno otherwise.
- */
- static int spi_nor_parse_sfdp(struct spi_nor *nor,
- struct spi_nor_flash_parameter *params)
- {
- const struct sfdp_parameter_header *param_header, *bfpt_header;
- struct sfdp_parameter_header *param_headers = NULL;
- struct sfdp_header header;
- size_t psize;
- int i, err;
- /* Get the SFDP header. */
- err = spi_nor_read_sfdp(nor, 0, sizeof(header), &header);
- if (err < 0)
- return err;
- /* Check the SFDP header version. */
- if (le32_to_cpu(header.signature) != SFDP_SIGNATURE ||
- header.major != SFDP_JESD216_MAJOR)
- return -EINVAL;
- /*
- * Verify that the first and only mandatory parameter header is a
- * Basic Flash Parameter Table header as specified in JESD216.
- */
- bfpt_header = &header.bfpt_header;
- if (SFDP_PARAM_HEADER_ID(bfpt_header) != SFDP_BFPT_ID ||
- bfpt_header->major != SFDP_JESD216_MAJOR)
- return -EINVAL;
- /*
- * Allocate memory then read all parameter headers with a single
- * Read SFDP command. These parameter headers will actually be parsed
- * twice: a first time to get the latest revision of the basic flash
- * parameter table, then a second time to handle the supported optional
- * tables.
- * Hence we read the parameter headers once for all to reduce the
- * processing time. Also we use kmalloc() instead of devm_kmalloc()
- * because we don't need to keep these parameter headers: the allocated
- * memory is always released with kfree() before exiting this function.
- */
- if (header.nph) {
- psize = header.nph * sizeof(*param_headers);
- param_headers = kmalloc(psize, GFP_KERNEL);
- if (!param_headers)
- return -ENOMEM;
- err = spi_nor_read_sfdp(nor, sizeof(header),
- psize, param_headers);
- if (err < 0) {
- dev_err(dev, "failed to read SFDP parameter headers\n");
- goto exit;
- }
- }
- /*
- * Check other parameter headers to get the latest revision of
- * the basic flash parameter table.
- */
- for (i = 0; i < header.nph; i++) {
- param_header = ¶m_headers[i];
- if (SFDP_PARAM_HEADER_ID(param_header) == SFDP_BFPT_ID &&
- param_header->major == SFDP_JESD216_MAJOR &&
- (param_header->minor > bfpt_header->minor ||
- (param_header->minor == bfpt_header->minor &&
- param_header->length > bfpt_header->length)))
- bfpt_header = param_header;
- }
- err = spi_nor_parse_bfpt(nor, bfpt_header, params);
- if (err)
- goto exit;
- /* Parse other parameter headers. */
- for (i = 0; i < header.nph; i++) {
- param_header = ¶m_headers[i];
- switch (SFDP_PARAM_HEADER_ID(param_header)) {
- case SFDP_SECTOR_MAP_ID:
- dev_info(dev, "non-uniform erase sector maps are not supported yet.\n");
- break;
- case SFDP_SST_ID:
- err = spi_nor_parse_microchip_sfdp(nor, param_header);
- break;
- default:
- break;
- }
- if (err) {
- dev_warn(dev, "Failed to parse optional parameter table: %04x\n",
- SFDP_PARAM_HEADER_ID(param_header));
- /*
- * Let's not drop all information we extracted so far
- * if optional table parsers fail. In case of failing,
- * each optional parser is responsible to roll back to
- * the previously known spi_nor data.
- */
- err = 0;
- }
- }
- exit:
- kfree(param_headers);
- return err;
- }
- #else
- static int spi_nor_parse_sfdp(struct spi_nor *nor,
- struct spi_nor_flash_parameter *params)
- {
- return -EINVAL;
- }
- #endif /* SPI_FLASH_SFDP_SUPPORT */
- static int spi_nor_init_params(struct spi_nor *nor,
- const struct flash_info *info,
- struct spi_nor_flash_parameter *params)
- {
- /* Set legacy flash parameters as default. */
- memset(params, 0, sizeof(*params));
- /* Set SPI NOR sizes. */
- params->size = info->sector_size * info->n_sectors;
- params->page_size = info->page_size;
- /* (Fast) Read settings. */
- params->hwcaps.mask |= SNOR_HWCAPS_READ;
- spi_nor_set_read_settings(¶ms->reads[SNOR_CMD_READ],
- 0, 0, SPINOR_OP_READ,
- SNOR_PROTO_1_1_1);
- if (!(info->flags & SPI_NOR_NO_FR)) {
- params->hwcaps.mask |= SNOR_HWCAPS_READ_FAST;
- spi_nor_set_read_settings(¶ms->reads[SNOR_CMD_READ_FAST],
- 0, 8, SPINOR_OP_READ_FAST,
- SNOR_PROTO_1_1_1);
- }
- if (info->flags & SPI_NOR_DUAL_READ) {
- params->hwcaps.mask |= SNOR_HWCAPS_READ_1_1_2;
- spi_nor_set_read_settings(¶ms->reads[SNOR_CMD_READ_1_1_2],
- 0, 8, SPINOR_OP_READ_1_1_2,
- SNOR_PROTO_1_1_2);
- }
- if (info->flags & SPI_NOR_QUAD_READ) {
- params->hwcaps.mask |= SNOR_HWCAPS_READ_1_1_4;
- spi_nor_set_read_settings(¶ms->reads[SNOR_CMD_READ_1_1_4],
- 0, 8, SPINOR_OP_READ_1_1_4,
- SNOR_PROTO_1_1_4);
- }
- if (info->flags & SPI_NOR_OCTAL_READ) {
- params->hwcaps.mask |= SNOR_HWCAPS_READ_1_1_8;
- spi_nor_set_read_settings(¶ms->reads[SNOR_CMD_READ_1_1_8],
- 0, 8, SPINOR_OP_READ_1_1_8,
- SNOR_PROTO_1_1_8);
- }
- /* Page Program settings. */
- params->hwcaps.mask |= SNOR_HWCAPS_PP;
- spi_nor_set_pp_settings(¶ms->page_programs[SNOR_CMD_PP],
- SPINOR_OP_PP, SNOR_PROTO_1_1_1);
- if (info->flags & SPI_NOR_QUAD_READ) {
- params->hwcaps.mask |= SNOR_HWCAPS_PP_1_1_4;
- spi_nor_set_pp_settings(¶ms->page_programs[SNOR_CMD_PP_1_1_4],
- SPINOR_OP_PP_1_1_4, SNOR_PROTO_1_1_4);
- }
- /* Select the procedure to set the Quad Enable bit. */
- if (params->hwcaps.mask & (SNOR_HWCAPS_READ_QUAD |
- SNOR_HWCAPS_PP_QUAD)) {
- switch (JEDEC_MFR(info)) {
- #ifdef CONFIG_SPI_FLASH_MACRONIX
- case SNOR_MFR_MACRONIX:
- params->quad_enable = macronix_quad_enable;
- break;
- #endif
- case SNOR_MFR_ST:
- case SNOR_MFR_MICRON:
- break;
- default:
- #if defined(CONFIG_SPI_FLASH_SPANSION) || defined(CONFIG_SPI_FLASH_WINBOND)
- /* Kept only for backward compatibility purpose. */
- params->quad_enable = spansion_read_cr_quad_enable;
- #endif
- break;
- }
- }
- /* Override the parameters with data read from SFDP tables. */
- nor->addr_width = 0;
- nor->mtd.erasesize = 0;
- if ((info->flags & (SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ)) &&
- !(info->flags & SPI_NOR_SKIP_SFDP)) {
- struct spi_nor_flash_parameter sfdp_params;
- memcpy(&sfdp_params, params, sizeof(sfdp_params));
- if (spi_nor_parse_sfdp(nor, &sfdp_params)) {
- nor->addr_width = 0;
- nor->mtd.erasesize = 0;
- } else {
- memcpy(params, &sfdp_params, sizeof(*params));
- }
- }
- return 0;
- }
- static int spi_nor_hwcaps2cmd(u32 hwcaps, const int table[][2], size_t size)
- {
- size_t i;
- for (i = 0; i < size; i++)
- if (table[i][0] == (int)hwcaps)
- return table[i][1];
- return -EINVAL;
- }
- static int spi_nor_hwcaps_read2cmd(u32 hwcaps)
- {
- static const int hwcaps_read2cmd[][2] = {
- { SNOR_HWCAPS_READ, SNOR_CMD_READ },
- { SNOR_HWCAPS_READ_FAST, SNOR_CMD_READ_FAST },
- { SNOR_HWCAPS_READ_1_1_1_DTR, SNOR_CMD_READ_1_1_1_DTR },
- { SNOR_HWCAPS_READ_1_1_2, SNOR_CMD_READ_1_1_2 },
- { SNOR_HWCAPS_READ_1_2_2, SNOR_CMD_READ_1_2_2 },
- { SNOR_HWCAPS_READ_2_2_2, SNOR_CMD_READ_2_2_2 },
- { SNOR_HWCAPS_READ_1_2_2_DTR, SNOR_CMD_READ_1_2_2_DTR },
- { SNOR_HWCAPS_READ_1_1_4, SNOR_CMD_READ_1_1_4 },
- { SNOR_HWCAPS_READ_1_4_4, SNOR_CMD_READ_1_4_4 },
- { SNOR_HWCAPS_READ_4_4_4, SNOR_CMD_READ_4_4_4 },
- { SNOR_HWCAPS_READ_1_4_4_DTR, SNOR_CMD_READ_1_4_4_DTR },
- { SNOR_HWCAPS_READ_1_1_8, SNOR_CMD_READ_1_1_8 },
- { SNOR_HWCAPS_READ_1_8_8, SNOR_CMD_READ_1_8_8 },
- { SNOR_HWCAPS_READ_8_8_8, SNOR_CMD_READ_8_8_8 },
- { SNOR_HWCAPS_READ_1_8_8_DTR, SNOR_CMD_READ_1_8_8_DTR },
- };
- return spi_nor_hwcaps2cmd(hwcaps, hwcaps_read2cmd,
- ARRAY_SIZE(hwcaps_read2cmd));
- }
- static int spi_nor_hwcaps_pp2cmd(u32 hwcaps)
- {
- static const int hwcaps_pp2cmd[][2] = {
- { SNOR_HWCAPS_PP, SNOR_CMD_PP },
- { SNOR_HWCAPS_PP_1_1_4, SNOR_CMD_PP_1_1_4 },
- { SNOR_HWCAPS_PP_1_4_4, SNOR_CMD_PP_1_4_4 },
- { SNOR_HWCAPS_PP_4_4_4, SNOR_CMD_PP_4_4_4 },
- { SNOR_HWCAPS_PP_1_1_8, SNOR_CMD_PP_1_1_8 },
- { SNOR_HWCAPS_PP_1_8_8, SNOR_CMD_PP_1_8_8 },
- { SNOR_HWCAPS_PP_8_8_8, SNOR_CMD_PP_8_8_8 },
- };
- return spi_nor_hwcaps2cmd(hwcaps, hwcaps_pp2cmd,
- ARRAY_SIZE(hwcaps_pp2cmd));
- }
- static int spi_nor_select_read(struct spi_nor *nor,
- const struct spi_nor_flash_parameter *params,
- u32 shared_hwcaps)
- {
- int cmd, best_match = fls(shared_hwcaps & SNOR_HWCAPS_READ_MASK) - 1;
- const struct spi_nor_read_command *read;
- if (best_match < 0)
- return -EINVAL;
- cmd = spi_nor_hwcaps_read2cmd(BIT(best_match));
- if (cmd < 0)
- return -EINVAL;
- read = ¶ms->reads[cmd];
- nor->read_opcode = read->opcode;
- nor->read_proto = read->proto;
- /*
- * In the spi-nor framework, we don't need to make the difference
- * between mode clock cycles and wait state clock cycles.
- * Indeed, the value of the mode clock cycles is used by a QSPI
- * flash memory to know whether it should enter or leave its 0-4-4
- * (Continuous Read / XIP) mode.
- * eXecution In Place is out of the scope of the mtd sub-system.
- * Hence we choose to merge both mode and wait state clock cycles
- * into the so called dummy clock cycles.
- */
- nor->read_dummy = read->num_mode_clocks + read->num_wait_states;
- return 0;
- }
- static int spi_nor_select_pp(struct spi_nor *nor,
- const struct spi_nor_flash_parameter *params,
- u32 shared_hwcaps)
- {
- int cmd, best_match = fls(shared_hwcaps & SNOR_HWCAPS_PP_MASK) - 1;
- const struct spi_nor_pp_command *pp;
- if (best_match < 0)
- return -EINVAL;
- cmd = spi_nor_hwcaps_pp2cmd(BIT(best_match));
- if (cmd < 0)
- return -EINVAL;
- pp = ¶ms->page_programs[cmd];
- nor->program_opcode = pp->opcode;
- nor->write_proto = pp->proto;
- return 0;
- }
- static int spi_nor_select_erase(struct spi_nor *nor,
- const struct flash_info *info)
- {
- struct mtd_info *mtd = &nor->mtd;
- /* Do nothing if already configured from SFDP. */
- if (mtd->erasesize)
- return 0;
- #ifdef CONFIG_SPI_FLASH_USE_4K_SECTORS
- /* prefer "small sector" erase if possible */
- if (info->flags & SECT_4K) {
- nor->erase_opcode = SPINOR_OP_BE_4K;
- mtd->erasesize = 4096;
- } else if (info->flags & SECT_4K_PMC) {
- nor->erase_opcode = SPINOR_OP_BE_4K_PMC;
- mtd->erasesize = 4096;
- } else
- #endif
- {
- nor->erase_opcode = SPINOR_OP_SE;
- mtd->erasesize = info->sector_size;
- }
- return 0;
- }
- static int spi_nor_setup(struct spi_nor *nor, const struct flash_info *info,
- const struct spi_nor_flash_parameter *params,
- const struct spi_nor_hwcaps *hwcaps)
- {
- u32 ignored_mask, shared_mask;
- bool enable_quad_io;
- int err;
- /*
- * Keep only the hardware capabilities supported by both the SPI
- * controller and the SPI flash memory.
- */
- shared_mask = hwcaps->mask & params->hwcaps.mask;
- /* SPI n-n-n protocols are not supported yet. */
- ignored_mask = (SNOR_HWCAPS_READ_2_2_2 |
- SNOR_HWCAPS_READ_4_4_4 |
- SNOR_HWCAPS_READ_8_8_8 |
- SNOR_HWCAPS_PP_4_4_4 |
- SNOR_HWCAPS_PP_8_8_8);
- if (shared_mask & ignored_mask) {
- dev_dbg(nor->dev,
- "SPI n-n-n protocols are not supported yet.\n");
- shared_mask &= ~ignored_mask;
- }
- /* Select the (Fast) Read command. */
- err = spi_nor_select_read(nor, params, shared_mask);
- if (err) {
- dev_dbg(nor->dev,
- "can't select read settings supported by both the SPI controller and memory.\n");
- return err;
- }
- /* Select the Page Program command. */
- err = spi_nor_select_pp(nor, params, shared_mask);
- if (err) {
- dev_dbg(nor->dev,
- "can't select write settings supported by both the SPI controller and memory.\n");
- return err;
- }
- /* Select the Sector Erase command. */
- err = spi_nor_select_erase(nor, info);
- if (err) {
- dev_dbg(nor->dev,
- "can't select erase settings supported by both the SPI controller and memory.\n");
- return err;
- }
- /* Enable Quad I/O if needed. */
- enable_quad_io = (spi_nor_get_protocol_width(nor->read_proto) == 4 ||
- spi_nor_get_protocol_width(nor->write_proto) == 4);
- if (enable_quad_io && params->quad_enable)
- nor->quad_enable = params->quad_enable;
- else
- nor->quad_enable = NULL;
- return 0;
- }
- static int spi_nor_init(struct spi_nor *nor)
- {
- int err;
- /*
- * Atmel, SST, Intel/Numonyx, and others serial NOR tend to power up
- * with the software protection bits set
- */
- if (JEDEC_MFR(nor->info) == SNOR_MFR_ATMEL ||
- JEDEC_MFR(nor->info) == SNOR_MFR_INTEL ||
- JEDEC_MFR(nor->info) == SNOR_MFR_SST ||
- nor->info->flags & SPI_NOR_HAS_LOCK) {
- write_enable(nor);
- write_sr(nor, 0);
- spi_nor_wait_till_ready(nor);
- }
- if (nor->quad_enable) {
- err = nor->quad_enable(nor);
- if (err) {
- dev_dbg(nor->dev, "quad mode not supported\n");
- return err;
- }
- }
- if (nor->addr_width == 4 &&
- (JEDEC_MFR(nor->info) != SNOR_MFR_SPANSION) &&
- !(nor->info->flags & SPI_NOR_4B_OPCODES)) {
- /*
- * If the RESET# pin isn't hooked up properly, or the system
- * otherwise doesn't perform a reset command in the boot
- * sequence, it's impossible to 100% protect against unexpected
- * reboots (e.g., crashes). Warn the user (or hopefully, system
- * designer) that this is bad.
- */
- if (nor->flags & SNOR_F_BROKEN_RESET)
- printf("enabling reset hack; may not recover from unexpected reboots\n");
- set_4byte(nor, nor->info, 1);
- }
- return 0;
- }
- int spi_nor_scan(struct spi_nor *nor)
- {
- struct spi_nor_flash_parameter params;
- const struct flash_info *info = NULL;
- struct mtd_info *mtd = &nor->mtd;
- struct spi_nor_hwcaps hwcaps = {
- .mask = SNOR_HWCAPS_READ |
- SNOR_HWCAPS_READ_FAST |
- SNOR_HWCAPS_PP,
- };
- struct spi_slave *spi = nor->spi;
- int ret;
- /* Reset SPI protocol for all commands. */
- nor->reg_proto = SNOR_PROTO_1_1_1;
- nor->read_proto = SNOR_PROTO_1_1_1;
- nor->write_proto = SNOR_PROTO_1_1_1;
- nor->read = spi_nor_read_data;
- nor->write = spi_nor_write_data;
- nor->read_reg = spi_nor_read_reg;
- nor->write_reg = spi_nor_write_reg;
- if (spi->mode & SPI_RX_OCTAL) {
- hwcaps.mask |= SNOR_HWCAPS_READ_1_1_8;
- if (spi->mode & SPI_TX_OCTAL)
- hwcaps.mask |= (SNOR_HWCAPS_READ_1_8_8 |
- SNOR_HWCAPS_PP_1_1_8 |
- SNOR_HWCAPS_PP_1_8_8);
- } else if (spi->mode & SPI_RX_QUAD) {
- hwcaps.mask |= SNOR_HWCAPS_READ_1_1_4;
- if (spi->mode & SPI_TX_QUAD)
- hwcaps.mask |= (SNOR_HWCAPS_READ_1_4_4 |
- SNOR_HWCAPS_PP_1_1_4 |
- SNOR_HWCAPS_PP_1_4_4);
- } else if (spi->mode & SPI_RX_DUAL) {
- hwcaps.mask |= SNOR_HWCAPS_READ_1_1_2;
- if (spi->mode & SPI_TX_DUAL)
- hwcaps.mask |= SNOR_HWCAPS_READ_1_2_2;
- }
- info = spi_nor_read_id(nor);
- if (IS_ERR_OR_NULL(info))
- return -ENOENT;
- /* Parse the Serial Flash Discoverable Parameters table. */
- ret = spi_nor_init_params(nor, info, ¶ms);
- if (ret)
- return ret;
- if (!mtd->name)
- mtd->name = info->name;
- mtd->priv = nor;
- mtd->type = MTD_NORFLASH;
- mtd->writesize = 1;
- mtd->flags = MTD_CAP_NORFLASH;
- mtd->size = params.size;
- mtd->_erase = spi_nor_erase;
- mtd->_read = spi_nor_read;
- #if defined(CONFIG_SPI_FLASH_STMICRO) || defined(CONFIG_SPI_FLASH_SST)
- /* NOR protection support for STmicro/Micron chips and similar */
- if (JEDEC_MFR(info) == SNOR_MFR_ST ||
- JEDEC_MFR(info) == SNOR_MFR_MICRON ||
- JEDEC_MFR(info) == SNOR_MFR_SST ||
- info->flags & SPI_NOR_HAS_LOCK) {
- nor->flash_lock = stm_lock;
- nor->flash_unlock = stm_unlock;
- nor->flash_is_locked = stm_is_locked;
- }
- #endif
- #ifdef CONFIG_SPI_FLASH_SST
- /*
- * sst26 series block protection implementation differs from other
- * series.
- */
- if (info->flags & SPI_NOR_HAS_SST26LOCK) {
- nor->flash_lock = sst26_lock;
- nor->flash_unlock = sst26_unlock;
- nor->flash_is_locked = sst26_is_locked;
- }
- /* sst nor chips use AAI word program */
- if (info->flags & SST_WRITE)
- mtd->_write = sst_write;
- else
- #endif
- mtd->_write = spi_nor_write;
- if (info->flags & USE_FSR)
- nor->flags |= SNOR_F_USE_FSR;
- if (info->flags & SPI_NOR_HAS_TB)
- nor->flags |= SNOR_F_HAS_SR_TB;
- if (info->flags & NO_CHIP_ERASE)
- nor->flags |= SNOR_F_NO_OP_CHIP_ERASE;
- if (info->flags & USE_CLSR)
- nor->flags |= SNOR_F_USE_CLSR;
- if (info->flags & SPI_NOR_NO_ERASE)
- mtd->flags |= MTD_NO_ERASE;
- nor->page_size = params.page_size;
- mtd->writebufsize = nor->page_size;
- /* Some devices cannot do fast-read, no matter what DT tells us */
- if ((info->flags & SPI_NOR_NO_FR) || (spi->mode & SPI_RX_SLOW))
- params.hwcaps.mask &= ~SNOR_HWCAPS_READ_FAST;
- /*
- * Configure the SPI memory:
- * - select op codes for (Fast) Read, Page Program and Sector Erase.
- * - set the number of dummy cycles (mode cycles + wait states).
- * - set the SPI protocols for register and memory accesses.
- * - set the Quad Enable bit if needed (required by SPI x-y-4 protos).
- */
- ret = spi_nor_setup(nor, info, ¶ms, &hwcaps);
- if (ret)
- return ret;
- if (nor->addr_width) {
- /* already configured from SFDP */
- } else if (info->addr_width) {
- nor->addr_width = info->addr_width;
- } else if (mtd->size > SZ_16M) {
- #ifndef CONFIG_SPI_FLASH_BAR
- /* enable 4-byte addressing if the device exceeds 16MiB */
- nor->addr_width = 4;
- if (JEDEC_MFR(info) == SNOR_MFR_SPANSION ||
- info->flags & SPI_NOR_4B_OPCODES)
- spi_nor_set_4byte_opcodes(nor, info);
- #else
- /* Configure the BAR - discover bank cmds and read current bank */
- nor->addr_width = 3;
- ret = read_bar(nor, info);
- if (ret < 0)
- return ret;
- #endif
- } else {
- nor->addr_width = 3;
- }
- if (nor->addr_width > SPI_NOR_MAX_ADDR_WIDTH) {
- dev_dbg(dev, "address width is too large: %u\n",
- nor->addr_width);
- return -EINVAL;
- }
- /* Send all the required SPI flash commands to initialize device */
- nor->info = info;
- ret = spi_nor_init(nor);
- if (ret)
- return ret;
- nor->name = mtd->name;
- nor->size = mtd->size;
- nor->erase_size = mtd->erasesize;
- nor->sector_size = mtd->erasesize;
- #ifndef CONFIG_SPL_BUILD
- printf("SF: Detected %s with page size ", nor->name);
- print_size(nor->page_size, ", erase size ");
- print_size(nor->erase_size, ", total ");
- print_size(nor->size, "");
- puts("\n");
- #endif
- return 0;
- }
- /* U-Boot specific functions, need to extend MTD to support these */
- int spi_flash_cmd_get_sw_write_prot(struct spi_nor *nor)
- {
- int sr = read_sr(nor);
- if (sr < 0)
- return sr;
- return (sr >> 2) & 7;
- }
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