[PATCH 1/1] mtd: spi-nor: parse Serial Flash Discoverable Parameters (SFDP) tables
Marek Vasut
marek.vasut at gmail.com
Sat Jun 17 05:34:22 PDT 2017
On 06/16/2017 02:40 PM, Cyrille Pitchen wrote:
> From: Cyrille Pitchen <cyrille.pitchen at atmel.com>
>
> This patch adds support to the JESD216B standard and parses the SFDP
> tables to dynamically initialize the 'struct spi_nor_flash_parameter'.
>
> Signed-off-by: Cyrille Pitchen <cyrille.pitchen at atmel.com>
> ---
> Hi all,
>
> starting a new series since most patches of previous series have already
> been merged into the spi-nor/next branch of l2-mtd, hence also available
> in linux-next (support of the 4-byte address instruction set and SPI 1-4-4
> protocol).
> So this is the continuation of my work:
> https://patchwork.ozlabs.org/patch/742380/
>
> From v5 RFC, I've made the following changes (taking Marek's comments
> into account):
> - rebase the SFDP patch so it no longer depends on the patch adding
> support of SPI NOR memories with non-uniform erase sector map. I'm still
> working on this other topic too, studying Marek's suggestions on how to
> manage the erase sector maps, but this is not ready yet.
> So I'm focusing on SFDP first. Anyway, the actual layout of the erase
> sector map is provided by some dedicated SFDP table, the Sector Map table.
>
> - rewrite the final test at the end of spansion_new_quad_enable() and
> sr2_bit7_quad_enable() so it follows a common pattern with the already
> existing macronix_quad_enable() and spansion_quad_enable() functions.
>
> - remove some u32 and u16 casts.
>
> - replace the 'enum sfdp_bfpt_dword' by a DFPT_DWORD() macro so we can
> handle the translation from 1-indexed JESD216 Basic Flash Parameter
> DWORDx and the 0-indexed arrays of the C language.
>
> - remove some u in integral constants: 0x07u -> 0x07
>
> - remove dev_err() message when kmalloc() fails
>
> - test return code of spi_nor_parse_sfdp() from spi_nor_init_params().
>
> - fix the decoding of the SPI NOR flash memory size from DWORD2 of the
> Basic Flash Paramaters: a +1 was missing to get the correct size.
>
> - add check of DWORD1 to handle the cases of 3-byte only and 4-byte only
> address.
>
> - restore the 'struct spi_nor_flash_parameter' to its previous state if
> the parsing of the SFDP tables fails for any reason.
>
> - add a new test to skip the parsing of the SFDP tables: since all 'old'
> SPI memories are not JESD216x compliant (this specification did not exit
> yet), we try to parse the SFDP tables only for memory with info->flags
> including SPI_NOR_DUAL_READ or SPI_NOR_QUAD_READ. Indeed, SFDP tables
> are mainly used to get settings of Dual and/or Quad SPI commands.
> Also, AFAIK, SPI NOR memories compliant with the JESD216x specification
> are all QSPI memories.
> Avoiding sending a useless command to 'old' SPI NOR memories prevents
> from slowing the detection of the memory and maybe (never get this case
> yet) from getting unexpected side effects.
>
>
> Best regards,
>
> Cyrille
>
>
> drivers/mtd/spi-nor/spi-nor.c | 590 +++++++++++++++++++++++++++++++++++++++++-
> include/linux/mtd/spi-nor.h | 6 +
> 2 files changed, 594 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> index eef55b597ec7..dcac6d2d8651 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -17,6 +17,7 @@
> #include <linux/mutex.h>
> #include <linux/math64.h>
> #include <linux/sizes.h>
> +#include <linux/slab.h>
>
> #include <linux/mtd/mtd.h>
> #include <linux/of_platform.h>
> @@ -86,6 +87,7 @@ struct flash_info {
> * to support memory size above 128Mib.
> */
> #define NO_CHIP_ERASE BIT(12) /* Chip does not support chip erase */
> +#define SPI_NOR_SKIP_SFDP BIT(13) /* Skip parsing of SFDP tables */
> };
>
> #define JEDEC_MFR(info) ((info)->id[0])
> @@ -1447,6 +1449,97 @@ static int spansion_quad_enable(struct spi_nor *nor)
> return 0;
> }
Please add kerneldoc , also I dunno about the _new_ name , maybe you
should find something more descriptive. The _new_ will be obsolete once
spansion invents something newer .
> +static int spansion_new_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_err(nor->dev,
> + "error while reading configuration register\n");
> + return -EINVAL;
> + }
> + sr_cr[1] = ret;
> + if (sr_cr[1] & CR_QUAD_EN_SPAN)
> + return 0;
I'd invert this, so that the code would test the rest and only then
assign it into sr_cr, ie.
if (ret & CR_....)
return 0;
sr_cr[1] = ret;
> + /* Keep the current value of the Status Register. */
> + ret = read_sr(nor);
> + if (ret < 0) {
> + dev_err(nor->dev,
> + "error while reading status register\n");
> + return -EINVAL;
> + }
> + sr_cr[0] = ret;
> + sr_cr[1] |= CR_QUAD_EN_SPAN;
> +
> + write_enable(nor);
> +
> + ret = nor->write_reg(nor, SPINOR_OP_WRSR, sr_cr, 2);
> + if (ret < 0) {
> + dev_err(nor->dev,
> + "error while writing configuration register\n");
> + return -EINVAL;
> + }
> +
> + ret = spi_nor_wait_till_ready(nor);
> + if (ret < 0) {
> + dev_err(nor->dev, "error while waiting for WRSR completion\n");
> + return ret;
> + }
> +
> + /* Read back and check it. */
> + ret = read_cr(nor);
> + if (!(ret > 0 && (ret & CR_QUAD_EN_SPAN))) {
> + dev_err(nor->dev, "Spansion Quad bit not set\n");
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
kerneldoc . What does sr2 mean? (I know what it means, but kerneldoc
should explain it)
> +static int sr2_bit7_quad_enable(struct spi_nor *nor)
> +{
> + u8 sr2;
> + int ret;
> +
> + /* Check current Quad Enable bit value. */
> + ret = nor->read_reg(nor, SPINOR_OP_RDSR2, &sr2, 1);
> + if (ret)
> + return ret;
> + if (sr2 & SR2_QUAD_EN_BIT7)
> + return 0;
> +
> + /* Update the Quad Enable bit. */
> + sr2 |= SR2_QUAD_EN_BIT7;
> +
> + write_enable(nor);
> +
> + ret = nor->write_reg(nor, SPINOR_OP_WRSR2, &sr2, 1);
> + if (ret < 0) {
> + dev_err(nor->dev,
> + "error while writing status register 2\n");
Maybe introduce a new variable dev = nor->dev and avoid breaking the
lines like that ? DTTO above.
> + return -EINVAL;
> + }
> +
> + ret = spi_nor_wait_till_ready(nor);
> + if (ret < 0) {
> + dev_err(nor->dev, "error while waiting for WRSR2 completion\n");
> + return ret;
> + }
> +
> + /* Read back and check it. */
> + ret = nor->read_reg(nor, SPINOR_OP_RDSR2, &sr2, 1);
> + if (!(ret > 0 && (sr2 & SR2_QUAD_EN_BIT7))) {
> + dev_err(nor->dev, "SR2 Quad bit not set\n");
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> static int spi_nor_check(struct spi_nor *nor)
> {
> if (!nor->dev || !nor->read || !nor->write ||
> @@ -1586,6 +1679,477 @@ spi_nor_set_pp_settings(struct spi_nor_pp_command *pp,
> pp->proto = proto;
> }
>
> +/*
> + * SFDP parsing.
> + */
> +
> +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;
> +
> + ret = nor->read(nor, addr, len, (u8 *)buf);
> +
> + nor->read_opcode = read_opcode;
> + nor->addr_width = addr_width;
> + nor->read_dummy = read_dummy;
> +
> + return (ret < 0) ? ret : 0;
Would it hurt to just propagate the ret from nor->read ?
> +}
> +
> +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_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 */
> +
> +/*
> + * JESD216B 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 revision 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 JESD216B)
> + * 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 inline 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;
> + int 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;
> + int shift;
Should the shift be unsigned too ?
> +};
> +
> +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);
> +
> +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(uint32_t));
sizeof(u32) , nuke all the uint.*_t .
> + addr = SFDP_PARAM_HEADER_PTP(bfpt_header);
> + memset(&bfpt, 0, sizeof(bfpt));
> + err = spi_nor_read_sfdp(nor, addr, len, &bfpt);
> + if (err)
> + 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);
> + 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];
> + uint32_t 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);
Drop the parenthesis .
> + opcode = (half >> 8) & 0xff;
> +#ifdef CONFIG_MTD_SPI_NOR_USE_4K_SECTORS
> + if (erasesize == 4096) {
> + 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);
Drop the ()
> + /* Enable Quad I/O. */
> + switch (bfpt.dwords[BFPT_DWORD(15)] & BFPT_DWORD15_QER_MASK) {
> + default:
> + case BFPT_DWORD15_QER_NONE:
> + params->quad_enable = NULL;
> + break;
> +
> + case BFPT_DWORD15_QER_SR2_BIT1_BUGGY:
> + case BFPT_DWORD15_QER_SR2_BIT1_NO_RD:
> + params->quad_enable = spansion_quad_enable;
> + break;
> +
> + case BFPT_DWORD15_QER_SR1_BIT6:
> + params->quad_enable = macronix_quad_enable;
> + break;
> +
> + case BFPT_DWORD15_QER_SR2_BIT7:
> + params->quad_enable = sr2_bit7_quad_enable;
> + break;
> +
> + case BFPT_DWORD15_QER_SR2_BIT1:
> + params->quad_enable = spansion_new_quad_enable;
> + break;
Is default: needed here ?
> + }
> +
> + return 0;
> +}
> +
> +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)
> + return err;
> +
> + /* Check the SFDP header version. */
> + if (le32_to_cpu(header.signature) != SFDP_SIGNATURE ||
> + header.major != SFDP_JESD216_MAJOR ||
> + header.minor < SFDP_JESD216_MINOR)
> + 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 for parameter headers. */
> + if (header.nph) {
> + psize = header.nph * sizeof(*param_headers);
> +
> + param_headers = kmalloc(psize, GFP_KERNEL);
devm_() ?
> + if (!param_headers)
> + return -ENOMEM;
> +
> + err = spi_nor_read_sfdp(nor, sizeof(header),
> + psize, param_headers);
> + if (err) {
> + dev_err(nor->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)))
I'm not comfortable with this indent ...
> + bfpt_header = param_header;
> + }
Newline.
> + 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(nor->dev,
> + "non-uniform erase sector maps are not supported yet.\n");
> + break;
> +
> + default:
> + break;
> + }
> +
> + if (err)
> + goto exit;
> + }
> +
> +exit:
> + kfree(param_headers);
> + return err;
> +}
> +
> static int spi_nor_init_params(struct spi_nor *nor,
> const struct flash_info *info,
> struct spi_nor_flash_parameter *params)
> @@ -1646,6 +2210,22 @@ static int spi_nor_init_params(struct spi_nor *nor,
> }
> }
>
> + /* 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;
> }
>
> @@ -1757,6 +2337,10 @@ static int spi_nor_select_erase(struct spi_nor *nor,
> {
> struct mtd_info *mtd = &nor->mtd;
>
> + /* Do nothing if already configured from SFDP. */
> + if (mtd->erasesize)
> + return 0;
> +
> #ifdef CONFIG_MTD_SPI_NOR_USE_4K_SECTORS
> /* prefer "small sector" erase if possible */
> if (info->flags & SECT_4K) {
> @@ -1989,9 +2573,11 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
> if (ret)
> return ret;
>
> - if (info->addr_width)
> + if (nor->addr_width) {
> + /* already configured by spi_nor_setup() */
> + } else if (info->addr_width) {
> nor->addr_width = info->addr_width;
> - else if (mtd->size > 0x1000000) {
> + } else if (mtd->size > 0x1000000) {
> /* enable 4-byte addressing if the device exceeds 16MiB */
> nor->addr_width = 4;
> if (JEDEC_MFR(info) == SNOR_MFR_SPANSION ||
> diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
> index 55faa2f07cca..0df3638ff0b8 100644
> --- a/include/linux/mtd/spi-nor.h
> +++ b/include/linux/mtd/spi-nor.h
> @@ -41,6 +41,8 @@
> #define SPINOR_OP_WREN 0x06 /* Write enable */
> #define SPINOR_OP_RDSR 0x05 /* Read status register */
> #define SPINOR_OP_WRSR 0x01 /* Write status register 1 byte */
> +#define SPINOR_OP_RDSR2 0x3f /* Read status register 2 */
> +#define SPINOR_OP_WRSR2 0x3e /* Write status register 2 */
> #define SPINOR_OP_READ 0x03 /* Read data bytes (low frequency) */
> #define SPINOR_OP_READ_FAST 0x0b /* Read data bytes (high frequency) */
> #define SPINOR_OP_READ_1_1_2 0x3b /* Read data bytes (Dual Output SPI) */
> @@ -56,6 +58,7 @@
> #define SPINOR_OP_CHIP_ERASE 0xc7 /* Erase whole flash chip */
> #define SPINOR_OP_SE 0xd8 /* Sector erase (usually 64KiB) */
> #define SPINOR_OP_RDID 0x9f /* Read JEDEC ID */
> +#define SPINOR_OP_RDSFDP 0x5a /* Read SFDP */
> #define SPINOR_OP_RDCR 0x35 /* Read configuration register */
> #define SPINOR_OP_RDFSR 0x70 /* Read flag status register */
>
> @@ -128,6 +131,9 @@
> /* Configuration Register bits. */
> #define CR_QUAD_EN_SPAN BIT(1) /* Spansion Quad I/O */
>
> +/* Status Register 2 bits. */
> +#define SR2_QUAD_EN_BIT7 BIT(7)
> +
> /* Supported SPI protocols */
> #define SNOR_PROTO_INST_MASK GENMASK(23, 16)
> #define SNOR_PROTO_INST_SHIFT 16
>
--
Best regards,
Marek Vasut
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