[PATCH v3 04/16] mtd: nand: get rid of busw parameter
Boris Brezillon
boris.brezillon at free-electrons.com
Mon Jun 20 02:26:50 PDT 2016
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>
---
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 f890f3e2eaa3..b174d7c6ba1f 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -3151,8 +3151,10 @@ 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;
@@ -3329,7 +3331,7 @@ 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;
@@ -3398,9 +3400,7 @@ static int nand_flash_detect_onfi(struct nand_chip *chip, int *busw)
chip->bits_per_cell = p->bits_per_cell;
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;
@@ -3433,7 +3433,7 @@ 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;
@@ -3494,9 +3494,7 @@ 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];
@@ -3585,7 +3583,7 @@ 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;
@@ -3638,7 +3636,6 @@ 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;
@@ -3679,7 +3676,6 @@ 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);
@@ -3692,7 +3688,8 @@ 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
@@ -3717,8 +3714,7 @@ 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;
@@ -3727,7 +3723,6 @@ 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;
@@ -3790,7 +3785,7 @@ 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;
@@ -3808,8 +3803,6 @@ 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;
@@ -3870,9 +3863,24 @@ static struct nand_flash_dev *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;
@@ -3882,11 +3890,11 @@ static struct nand_flash_dev *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;
}
@@ -3900,9 +3908,9 @@ static struct nand_flash_dev *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;
@@ -3922,9 +3930,8 @@ 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
@@ -3933,9 +3940,8 @@ 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 %d bit\n", busw ? 16 : 8,
+ (chip->options & NAND_BUSWIDTH_16) ? 16 : 8);
return ERR_PTR(-EINVAL);
}
@@ -4152,7 +4158,7 @@ int nand_scan_ident(struct mtd_info *mtd, int maxchips,
mtd->name = dev_name(mtd->dev.parent);
/* Set the default functions */
- nand_set_defaults(chip, chip->options & NAND_BUSWIDTH_16);
+ nand_set_defaults(chip);
/* Read the flash type */
type = nand_get_flash_type(chip, table);
--
2.7.4
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