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mtd: nand: Get rid of busw parameter

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Auto-detection functions are passed a busw parameter to retrieve the actual
NAND bus width and eventually set the correct value in chip->options.
Rework the nand_get_flash_type() function to get rid of this extra
parameter and let detection code directly set the NAND_BUSWIDTH_16 flag in
chip->options if needed.

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 20:17:48 +02:00
parent 7f501f0a72
commit 29a198a159
1 changed files with 37 additions and 31 deletions
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68
drivers/mtd/nand/nand_base.c
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@ -3385,8 +3385,10 @@ static void nand_shutdown(struct mtd_info *mtd)
}
/* Set default functions */
static void nand_set_defaults(struct nand_chip *chip, int busw)
static void nand_set_defaults(struct nand_chip *chip)
{
unsigned int busw = chip->options & NAND_BUSWIDTH_16;
/* check for proper chip_delay setup, set 20us if not */
if (!chip->chip_delay)
chip->chip_delay = 20;
@ -3562,7 +3564,7 @@ static void nand_onfi_detect_micron(struct nand_chip *chip,
/*
* Check if the NAND chip is ONFI compliant, returns 1 if it is, 0 otherwise.
*/
static int nand_flash_detect_onfi(struct nand_chip *chip, int *busw)
static int nand_flash_detect_onfi(struct nand_chip *chip)
{
struct mtd_info *mtd = nand_to_mtd(chip);
struct nand_onfi_params *p = &chip->onfi_params;
@ -3634,9 +3636,7 @@ static int nand_flash_detect_onfi(struct nand_chip *chip, int *busw)
chip->blocks_per_die = le32_to_cpu(p->blocks_per_lun);
if (onfi_feature(chip) & ONFI_FEATURE_16_BIT_BUS)
*busw = NAND_BUSWIDTH_16;
else
*busw = 0;
chip->options |= NAND_BUSWIDTH_16;
if (p->ecc_bits != 0xff) {
chip->ecc_strength_ds = p->ecc_bits;
@ -3669,7 +3669,7 @@ static int nand_flash_detect_onfi(struct nand_chip *chip, int *busw)
/*
* Check if the NAND chip is JEDEC compliant, returns 1 if it is, 0 otherwise.
*/
static int nand_flash_detect_jedec(struct nand_chip *chip, int *busw)
static int nand_flash_detect_jedec(struct nand_chip *chip)
{
struct mtd_info *mtd = nand_to_mtd(chip);
struct nand_jedec_params *p = &chip->jedec_params;
@ -3730,9 +3730,7 @@ static int nand_flash_detect_jedec(struct nand_chip *chip, int *busw)
chip->bits_per_cell = p->bits_per_cell;
if (jedec_feature(chip) & JEDEC_FEATURE_16_BIT_BUS)
*busw = NAND_BUSWIDTH_16;
else
*busw = 0;
chip->options |= NAND_BUSWIDTH_16;
/* ECC info */
ecc = &p->ecc_info[0];
@ -3821,7 +3819,7 @@ 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, int *busw)
static void nand_decode_ext_id(struct nand_chip *chip)
{
struct mtd_info *mtd = nand_to_mtd(chip);
int extid, id_len = chip->id.len;
@ -3874,7 +3872,6 @@ static void nand_decode_ext_id(struct nand_chip *chip, int *busw)
/* Calc blocksize */
mtd->erasesize = (128 * 1024) <<
(((extid >> 1) & 0x04) | (extid & 0x03));
*busw = 0;
} else if (id_len == 6 && id_data[0] == NAND_MFR_HYNIX &&
!nand_is_slc(chip)) {
unsigned int tmp;
@ -3915,7 +3912,6 @@ static void nand_decode_ext_id(struct nand_chip *chip, int *busw)
mtd->erasesize = 768 * 1024;
else
mtd->erasesize = (64 * 1024) << tmp;
*busw = 0;
} else {
/* Calc pagesize */
mtd->writesize = 1024 << (extid & 0x03);
@ -3928,7 +3924,8 @@ static void nand_decode_ext_id(struct nand_chip *chip, int *busw)
mtd->erasesize = (64 * 1024) << (extid & 0x03);
extid >>= 2;
/* Get buswidth information */
*busw = (extid & 0x01) ? NAND_BUSWIDTH_16 : 0;
if (extid & 0x1)
chip->options |= NAND_BUSWIDTH_16;
/*
* Toshiba 24nm raw SLC (i.e., not BENAND) have 32B OOB per
@ -3953,8 +3950,7 @@ static void nand_decode_ext_id(struct nand_chip *chip, int *busw)
* decodes a matching ID table entry and assigns the MTD size parameters for
* the chip.
*/
static void nand_decode_id(struct nand_chip *chip, struct nand_flash_dev *type,
int *busw)
static void nand_decode_id(struct nand_chip *chip, struct nand_flash_dev *type)
{
struct mtd_info *mtd = nand_to_mtd(chip);
u8 *id_data = chip->id.data;
@ -3963,7 +3959,6 @@ static void nand_decode_id(struct nand_chip *chip, struct nand_flash_dev *type,
mtd->erasesize = type->erasesize;
mtd->writesize = type->pagesize;
mtd->oobsize = mtd->writesize / 32;
*busw = type->options & NAND_BUSWIDTH_16;
/* All legacy ID NAND are small-page, SLC */
chip->bits_per_cell = 1;
@ -4026,7 +4021,7 @@ 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, int *busw)
struct nand_flash_dev *type)
{
struct mtd_info *mtd = nand_to_mtd(chip);
u8 *id_data = chip->id.data;
@ -4044,8 +4039,6 @@ static bool find_full_id_nand(struct nand_chip *chip,
chip->onfi_timing_mode_default =
type->onfi_timing_mode_default;
*busw = type->options & NAND_BUSWIDTH_16;
if (!mtd->name)
mtd->name = type->name;
@ -4106,9 +4099,24 @@ static int nand_get_flash_type(struct nand_chip *chip,
if (!type)
type = nand_flash_ids;
/*
* Save the NAND_BUSWIDTH_16 flag before letting auto-detection logic
* override it.
* This is required to make sure initial NAND bus width set by the
* NAND controller driver is coherent with the real NAND bus width
* (extracted by auto-detection code).
*/
busw = chip->options & NAND_BUSWIDTH_16;
/*
* The flag is only set (never cleared), reset it to its default value
* before starting auto-detection.
*/
chip->options &= ~NAND_BUSWIDTH_16;
for (; type->name != NULL; type++) {
if (is_full_id_nand(type)) {
if (find_full_id_nand(chip, type, &busw))
if (find_full_id_nand(chip, type))
goto ident_done;
} else if (dev_id == type->dev_id) {
break;
@ -4118,11 +4126,11 @@ static int nand_get_flash_type(struct nand_chip *chip,
chip->onfi_version = 0;
if (!type->name || !type->pagesize) {
/* Check if the chip is ONFI compliant */
if (nand_flash_detect_onfi(chip, &busw))
if (nand_flash_detect_onfi(chip))
goto ident_done;
/* Check if the chip is JEDEC compliant */
if (nand_flash_detect_jedec(chip, &busw))
if (nand_flash_detect_jedec(chip))
goto ident_done;
}
@ -4136,9 +4144,9 @@ static int nand_get_flash_type(struct nand_chip *chip,
if (!type->pagesize) {
/* Decode parameters from extended ID */
nand_decode_ext_id(chip, &busw);
nand_decode_ext_id(chip);
} else {
nand_decode_id(chip, type, &busw);
nand_decode_id(chip, type);
}
/* Get chip options */
chip->options |= type->options;
@ -4158,9 +4166,8 @@ ident_done:
}
if (chip->options & NAND_BUSWIDTH_AUTO) {
WARN_ON(chip->options & NAND_BUSWIDTH_16);
chip->options |= busw;
nand_set_defaults(chip, busw);
WARN_ON(busw & NAND_BUSWIDTH_16);
nand_set_defaults(chip);
} else if (busw != (chip->options & NAND_BUSWIDTH_16)) {
/*
* Check, if buswidth is correct. Hardware drivers should set
@ -4169,9 +4176,8 @@ ident_done:
pr_info("device found, Manufacturer ID: 0x%02x, Chip ID: 0x%02x\n",
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,
busw ? 16 : 8);
pr_warn("bus width %d instead of %d bits\n", busw ? 16 : 8,
(chip->options & NAND_BUSWIDTH_16) ? 16 : 8);
return -EINVAL;
}
@ -4399,7 +4405,7 @@ int nand_scan_ident(struct mtd_info *mtd, int maxchips,
return -EINVAL;
}
/* Set the default functions */
nand_set_defaults(chip, chip->options & NAND_BUSWIDTH_16);
nand_set_defaults(chip);
/* Read the flash type */
ret = nand_get_flash_type(chip, table);