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mtd: nand: Store nand ID in struct nand_chip

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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@free-electrons.com>
Acked-by: Richard Weinberger <richard@nod.at>
Reviewed-by: Marek Vasut <marek.vasut@gmail.com>
This commit is contained in:
Boris Brezillon 2016-05-24 19:20:05 +02:00
parent cbe435a182
commit 7f501f0a72
2 changed files with 43 additions and 25 deletions
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55
drivers/mtd/nand/nand_base.c
View File

@ -3821,18 +3821,16 @@ 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)
@ -3956,9 +3954,10 @@ 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;
@ -3988,9 +3987,10 @@ 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 */
@ -4026,10 +4026,10 @@ 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;
@ -4058,13 +4058,13 @@ 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)
@ -4079,8 +4079,8 @@ 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
@ -4095,20 +4095,22 @@ 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;
}
}
@ -4134,9 +4136,9 @@ 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;
@ -4145,13 +4147,13 @@ 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;
}
@ -4165,7 +4167,7 @@ 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,
@ -4173,7 +4175,7 @@ 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;
@ -4197,7 +4199,7 @@ 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,
@ -4400,7 +4402,7 @@ 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");
@ -4425,6 +4427,9 @@ 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 */

13
include/linux/mtd/nand.h
View File

@ -464,6 +464,17 @@ struct nand_jedec_params {
__le16 crc;
} __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
@ -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),
@ -881,6 +893,7 @@ struct nand_chip {
int badblockpos;
int badblockbits;
struct nand_id id;
int onfi_version;
int jedec_version;
union {