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mtd: nand: Add function to convert ONFI mode to data_interface

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onfi_init_data_interface() initializes a data interface with
values from a given ONFI mode.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
This commit is contained in:
Sascha Hauer 2016-09-15 10:32:48 +02:00 committed by Boris Brezillon
parent b1dd3ca203
commit b88730ada9
2 changed files with 34 additions and 0 deletions
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29
drivers/mtd/nand/nand_timings.c
View File

@ -269,3 +269,32 @@ const struct nand_sdr_timings *onfi_async_timing_mode_to_sdr_timings(int mode)
return &onfi_sdr_timings[mode].timings.sdr;
}
EXPORT_SYMBOL(onfi_async_timing_mode_to_sdr_timings);
/**
* onfi_init_data_interface - [NAND Interface] Initialize a data interface from
* given ONFI mode
* @iface: The data interface to be initialized
* @mode: The ONFI timing mode
*/
int onfi_init_data_interface(struct nand_chip *chip,
struct nand_data_interface *iface,
enum nand_data_interface_type type,
int timing_mode)
{
if (type != NAND_SDR_IFACE)
return -EINVAL;
if (timing_mode < 0 || timing_mode >= ARRAY_SIZE(onfi_sdr_timings))
return -EINVAL;
*iface = onfi_sdr_timings[timing_mode];
/*
* TODO: initialize timings that cannot be deduced from timing mode:
* tR, tPROG, tCCS, ...
* These information are part of the ONFI parameter page.
*/
return 0;
}
EXPORT_SYMBOL(onfi_init_data_interface);

5
include/linux/mtd/nand.h
View File

@ -1112,6 +1112,11 @@ static inline int onfi_get_sync_timing_mode(struct nand_chip *chip)
return le16_to_cpu(chip->onfi_params.src_sync_timing_mode);
}
int onfi_init_data_interface(struct nand_chip *chip,
struct nand_data_interface *iface,
enum nand_data_interface_type type,
int timing_mode);
/*
* Check if it is a SLC nand.
* The !nand_is_slc() can be used to check the MLC/TLC nand chips.