mtd: nand: Get rid of busw parameter
Linux-MTD Mailing List
linux-mtd at lists.infradead.org
Wed May 10 19:59:03 PDT 2017
Gitweb: http://git.infradead.org/?p=mtd-2.6.git;a=commit;h=29a198a1592d83f2bc1be3b2631b3bcf3d5b380f
Commit: 29a198a1592d83f2bc1be3b2631b3bcf3d5b380f
Parent: 7f501f0a72036dc29ad9a53811474c393634b401
Author: Boris Brezillon <boris.brezillon at free-electrons.com>
AuthorDate: Tue May 24 20:17:48 2016 +0200
Committer: Boris Brezillon <boris.brezillon at free-electrons.com>
CommitDate: Wed Mar 8 23:21:16 2017 +0100
mtd: nand: Get rid of busw parameter
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 at free-electrons.com>
Acked-by: Richard Weinberger <richard at nod.at>
Reviewed-by: Marek Vasut <marek.vasut at gmail.com>
---
drivers/mtd/nand/nand_base.c | 68 ++++++++++++++++++++++++--------------------
1 file changed, 37 insertions(+), 31 deletions(-)
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 6f3ae62..16b082f 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -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);
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