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| author | Boris BREZILLON <boris.brezillon@free-electrons.com> | 2014-09-22 20:11:50 +0200 |
|---|---|---|
| committer | Brian Norris <computersforpeace@gmail.com> | 2014-09-22 20:29:57 +0200 |
| commit | 57a94e24bc927f642f7f48ca1bf5476aa5be269d (patch) | |
| tree | 15c21381e30271c677de35583c0032ad4b8bbc05 | |
| parent | mtd: physmap_of: Add non-obsolete map_rom probe (diff) | |
| download | linux-57a94e24bc927f642f7f48ca1bf5476aa5be269d.tar.xz linux-57a94e24bc927f642f7f48ca1bf5476aa5be269d.zip | |
mtd: nand: support ONFI timing mode retrieval for non-ONFI NANDs
Add an onfi_timing_mode_default field to nand_chip and nand_flash_dev in
order to support NAND timings definition for non-ONFI NAND.
NAND that support better timings mode than the default one have to define
a new entry in the nand_ids table.
The default timing mode should be deduced from timings description from
the datasheet and the ONFI specification
(www.onfi.org/~/media/ONFI/specs/onfi_3_1_spec.pdf, chapter 4.15
"Timing Parameters").
You should choose the closest mode that fit the timings requirements of
your NAND chip.
Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
| -rw-r--r-- | drivers/mtd/nand/nand_base.c | 2 | ||||
| -rw-r--r-- | include/linux/mtd/nand.h | 11 |
2 files changed, 13 insertions, 0 deletions
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index 801cad1de9eb..5b5c62712814 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -3594,6 +3594,8 @@ static bool find_full_id_nand(struct mtd_info *mtd, struct nand_chip *chip, chip->options |= type->options; chip->ecc_strength_ds = NAND_ECC_STRENGTH(type); chip->ecc_step_ds = NAND_ECC_STEP(type); + chip->onfi_timing_mode_default = + type->onfi_timing_mode_default; *busw = type->options & NAND_BUSWIDTH_16; diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h index 8acb307b6fde..e4d451e4600b 100644 --- a/include/linux/mtd/nand.h +++ b/include/linux/mtd/nand.h @@ -587,6 +587,11 @@ struct nand_buffers { * @ecc_step_ds: [INTERN] ECC step required by the @ecc_strength_ds, * also from the datasheet. It is the recommended ECC step * size, if known; if unknown, set to zero. + * @onfi_timing_mode_default: [INTERN] default ONFI timing mode. This field is + * either deduced from the datasheet if the NAND + * chip is not ONFI compliant or set to 0 if it is + * (an ONFI chip is always configured in mode 0 + * after a NAND reset) * @numchips: [INTERN] number of physical chips * @chipsize: [INTERN] the size of one chip for multichip arrays * @pagemask: [INTERN] page number mask = number of (pages / chip) - 1 @@ -671,6 +676,7 @@ struct nand_chip { uint8_t bits_per_cell; uint16_t ecc_strength_ds; uint16_t ecc_step_ds; + int onfi_timing_mode_default; int badblockpos; int badblockbits; @@ -773,6 +779,10 @@ struct nand_chip { * @ecc_step_ds in nand_chip{}, also from the datasheet. * For example, the "4bit ECC for each 512Byte" can be set with * NAND_ECC_INFO(4, 512). + * @onfi_timing_mode_default: the default ONFI timing mode entered after a NAND + * reset. Should be deduced from timings described + * in the datasheet. + * */ struct nand_flash_dev { char *name; @@ -793,6 +803,7 @@ struct nand_flash_dev { uint16_t strength_ds; uint16_t step_ds; } ecc; + int onfi_timing_mode_default; }; /** |