Re: [PATCH v4 02/15] mtd: nand: store nand ID in struct nand_chip

From: Marek Vasut
Date: Wed Jan 04 2017 - 13:57:06 EST

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In reply to: Boris Brezillon: "[PATCH v4 02/15] mtd: nand: store nand ID in struct nand_chip"
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On 01/03/2017 02:01 PM, Boris Brezillon wrote:
> Store the NAND ID in struct nand_chip to avoid passing id_data and id_len
> as function parameters.
>
> Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>

Reviewed-by: Marek Vasut <marek.vasut@xxxxxxxxx>

> ---
> drivers/mtd/nand/nand_base.c | 55 ++++++++++++++++++++++++--------------------
> include/linux/mtd/nand.h | 13 +++++++++++
> 2 files changed, 43 insertions(+), 25 deletions(-)
>
> diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
> index 6950978e77f5..309f2e113d39 100644
> --- a/drivers/mtd/nand/nand_base.c
> +++ b/drivers/mtd/nand/nand_base.c
> @@ -3781,18 +3781,16 @@ static int nand_get_bits_per_cell(u8 cellinfo)
> * chip. The rest of the parameters must be decoded according to generic or
> * manufacturer-specific "extended ID" decoding patterns.
> */
> -static void nand_decode_ext_id(struct nand_chip *chip, u8 id_data[8],
> - int *busw)
> +static void nand_decode_ext_id(struct nand_chip *chip, int *busw)
> {
> struct mtd_info *mtd = nand_to_mtd(chip);
> - int extid, id_len;
> + int extid, id_len = chip->id.len;
> + u8 *id_data = chip->id.data;
> /* The 3rd id byte holds MLC / multichip data */
> chip->bits_per_cell = nand_get_bits_per_cell(id_data[2]);
> /* The 4th id byte is the important one */
> extid = id_data[3];
>
> - id_len = nand_id_len(id_data, 8);
> -
> /*
> * Field definitions are in the following datasheets:
> * Old style (4,5 byte ID): Samsung K9GAG08U0M (p.32)
> @@ -3916,9 +3914,10 @@ static void nand_decode_ext_id(struct nand_chip *chip, u8 id_data[8],
> * the chip.
> */
> static void nand_decode_id(struct nand_chip *chip, struct nand_flash_dev *type,
> - u8 id_data[8], int *busw)
> + int *busw)
> {
> struct mtd_info *mtd = nand_to_mtd(chip);
> + u8 *id_data = chip->id.data;
> int maf_id = id_data[0];
>
> mtd->erasesize = type->erasesize;
> @@ -3948,9 +3947,10 @@ static void nand_decode_id(struct nand_chip *chip, struct nand_flash_dev *type,
> * heuristic patterns using various detected parameters (e.g., manufacturer,
> * page size, cell-type information).
> */
> -static void nand_decode_bbm_options(struct nand_chip *chip, u8 id_data[8])
> +static void nand_decode_bbm_options(struct nand_chip *chip)
> {
> struct mtd_info *mtd = nand_to_mtd(chip);
> + u8 *id_data = chip->id.data;
> int maf_id = id_data[0];
>
> /* Set the bad block position */
> @@ -3986,10 +3986,10 @@ static inline bool is_full_id_nand(struct nand_flash_dev *type)
> }
>
> static bool find_full_id_nand(struct nand_chip *chip,
> - struct nand_flash_dev *type, u8 *id_data,
> - int *busw)
> + struct nand_flash_dev *type, int *busw)
> {
> struct mtd_info *mtd = nand_to_mtd(chip);
> + u8 *id_data = chip->id.data;
>
> if (!strncmp(type->id, id_data, type->id_len)) {
> mtd->writesize = type->pagesize;
> @@ -4018,13 +4018,13 @@ static bool find_full_id_nand(struct nand_chip *chip,
> * Get the flash and manufacturer id and lookup if the type is supported.
> */
> static int nand_get_flash_type(struct nand_chip *chip,
> - int *maf_id, int *dev_id,
> struct nand_flash_dev *type)
> {
> struct mtd_info *mtd = nand_to_mtd(chip);
> int busw;
> int i, maf_idx;
> - u8 id_data[8];
> + u8 *id_data = chip->id.data;
> + u8 maf_id, dev_id;
>
> /*
> * Reset the chip, required by some chips (e.g. Micron MT29FxGxxxxx)
> @@ -4039,8 +4039,8 @@ static int nand_get_flash_type(struct nand_chip *chip,
> chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1);
>
> /* Read manufacturer and device IDs */
> - *maf_id = chip->read_byte(mtd);
> - *dev_id = chip->read_byte(mtd);
> + maf_id = chip->read_byte(mtd);
> + dev_id = chip->read_byte(mtd);
>
> /*
> * Try again to make sure, as some systems the bus-hold or other
> @@ -4055,20 +4055,22 @@ static int nand_get_flash_type(struct nand_chip *chip,
> for (i = 0; i < 8; i++)
> id_data[i] = chip->read_byte(mtd);
>
> - if (id_data[0] != *maf_id || id_data[1] != *dev_id) {
> + if (id_data[0] != maf_id || id_data[1] != dev_id) {
> pr_info("second ID read did not match %02x,%02x against %02x,%02x\n",
> - *maf_id, *dev_id, id_data[0], id_data[1]);
> + maf_id, dev_id, id_data[0], id_data[1]);
> return -ENODEV;
> }
>
> + chip->id.len = nand_id_len(id_data, 8);
> +
> if (!type)
> type = nand_flash_ids;
>
> for (; type->name != NULL; type++) {
> if (is_full_id_nand(type)) {
> - if (find_full_id_nand(chip, type, id_data, &busw))
> + if (find_full_id_nand(chip, type, &busw))
> goto ident_done;
> - } else if (*dev_id == type->dev_id) {
> + } else if (dev_id == type->dev_id) {
> break;
> }
> }
> @@ -4094,9 +4096,9 @@ static int nand_get_flash_type(struct nand_chip *chip,
>
> if (!type->pagesize) {
> /* Decode parameters from extended ID */
> - nand_decode_ext_id(chip, id_data, &busw);
> + nand_decode_ext_id(chip, &busw);
> } else {
> - nand_decode_id(chip, type, id_data, &busw);
> + nand_decode_id(chip, type, &busw);
> }
> /* Get chip options */
> chip->options |= type->options;
> @@ -4105,13 +4107,13 @@ static int nand_get_flash_type(struct nand_chip *chip,
> * Check if chip is not a Samsung device. Do not clear the
> * options for chips which do not have an extended id.
> */
> - if (*maf_id != NAND_MFR_SAMSUNG && !type->pagesize)
> + if (maf_id != NAND_MFR_SAMSUNG && !type->pagesize)
> chip->options &= ~NAND_SAMSUNG_LP_OPTIONS;
> ident_done:
>
> /* Try to identify manufacturer */
> for (maf_idx = 0; nand_manuf_ids[maf_idx].id != 0x0; maf_idx++) {
> - if (nand_manuf_ids[maf_idx].id == *maf_id)
> + if (nand_manuf_ids[maf_idx].id == maf_id)
> break;
> }
>
> @@ -4125,7 +4127,7 @@ static int nand_get_flash_type(struct nand_chip *chip,
> * chip correct!
> */
> pr_info("device found, Manufacturer ID: 0x%02x, Chip ID: 0x%02x\n",
> - *maf_id, *dev_id);
> + maf_id, dev_id);
> pr_info("%s %s\n", nand_manuf_ids[maf_idx].name, mtd->name);
> pr_warn("bus width %d instead %d bit\n",
> (chip->options & NAND_BUSWIDTH_16) ? 16 : 8,
> @@ -4133,7 +4135,7 @@ static int nand_get_flash_type(struct nand_chip *chip,
> return -EINVAL;
> }
>
> - nand_decode_bbm_options(chip, id_data);
> + nand_decode_bbm_options(chip);
>
> /* Calculate the address shift from the page size */
> chip->page_shift = ffs(mtd->writesize) - 1;
> @@ -4157,7 +4159,7 @@ static int nand_get_flash_type(struct nand_chip *chip,
> chip->cmdfunc = nand_command_lp;
>
> pr_info("device found, Manufacturer ID: 0x%02x, Chip ID: 0x%02x\n",
> - *maf_id, *dev_id);
> + maf_id, dev_id);
>
> if (chip->onfi_version)
> pr_info("%s %s\n", nand_manuf_ids[maf_idx].name,
> @@ -4360,7 +4362,7 @@ int nand_scan_ident(struct mtd_info *mtd, int maxchips,
> nand_set_defaults(chip, chip->options & NAND_BUSWIDTH_16);
>
> /* Read the flash type */
> - ret = nand_get_flash_type(chip, &nand_maf_id, &nand_dev_id, table);
> + ret = nand_get_flash_type(chip, table);
> if (ret) {
> if (!(chip->options & NAND_SCAN_SILENT_NODEV))
> pr_warn("No NAND device found\n");
> @@ -4385,6 +4387,9 @@ int nand_scan_ident(struct mtd_info *mtd, int maxchips,
> if (ret)
> return ret;
>
> + nand_maf_id = chip->id.data[0];
> + nand_dev_id = chip->id.data[1];
> +
> chip->select_chip(mtd, -1);
>
> /* Check for a chip array */
> diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
> index c5f3a012ae62..632975146c30 100644
> --- a/include/linux/mtd/nand.h
> +++ b/include/linux/mtd/nand.h
> @@ -465,6 +465,17 @@ struct nand_jedec_params {
> } __packed;
>
> /**
> + * struct nand_id - NAND id structure
> + * @data: buffer containing the id bytes. Currently 8 bytes large, but can
> + * be extended if required.
> + * @len: ID length.
> + */
> +struct nand_id {
> + u8 data[8];
> + int len;
> +};
> +
> +/**
> * struct nand_hw_control - Control structure for hardware controller (e.g ECC generator) shared among independent devices
> * @lock: protection lock
> * @active: the mtd device which holds the controller currently
> @@ -793,6 +804,7 @@ nand_get_sdr_timings(const struct nand_data_interface *conf)
> * @pagebuf_bitflips: [INTERN] holds the bitflip count for the page which is
> * currently in data_buf.
> * @subpagesize: [INTERN] holds the subpagesize
> + * @id: [INTERN] holds NAND ID
> * @onfi_version: [INTERN] holds the chip ONFI version (BCD encoded),
> * non 0 if ONFI supported.
> * @jedec_version: [INTERN] holds the chip JEDEC version (BCD encoded),
> @@ -877,6 +889,7 @@ struct nand_chip {
> int badblockpos;
> int badblockbits;
>
> + struct nand_id id;
> int onfi_version;
> int jedec_version;
> union {
>

--
Best regards,
Marek Vasut

Next message: James Bottomley: "Re: [tpmdd-devel] [PATCH RFC 0/4] RFC: in-kernel resource manager"
Previous message: Mike Snitzer: "Re: [PATCH v2 1/1] block: fix blk_queue_split() resource exhaustion"
In reply to: Boris Brezillon: "[PATCH v4 02/15] mtd: nand: store nand ID in struct nand_chip"
Next in thread: Boris Brezillon: "[PATCH v4 06/15] mtd: nand: kill the MTD_NAND_IDS Kconfig option"
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