[PATCH 1/2] mtd: add helpers to set/get features for ONFI nand

[Huang Shijie]

于 2012年09月11日 00:11, Vikram Narayanan 写道:
> Hello Huang Shijie,
>
> <Dropped cc's>
>
> Just a few nitpicks.
>
> On 9/10/2012 11:31 AM, Huang Shijie wrote:
>> Add the set-features(0xef)/get-features(0xee) helpers for ONFI nand.
>> Also add the necessary macros.
>>
>> Signed-off-by: Huang Shijie<b32955 at freescale.com>
>> ---
>> drivers/mtd/nand/nand_base.c | 50 
>> ++++++++++++++++++++++++++++++++++++++++++
>> include/linux/mtd/nand.h | 14 +++++++++++
>> 2 files changed, 64 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
>> index 88f671c..fbc49cc 100644
>> --- a/drivers/mtd/nand/nand_base.c
>> +++ b/drivers/mtd/nand/nand_base.c
>> @@ -2700,6 +2700,50 @@ static int nand_block_markbad(struct mtd_info 
>> *mtd, loff_t ofs)
>> }
>>
>> /**
>> + * nand_onfi_set_features- [REPLACEABLE] set features for ONFI nand
>> + * @mtd: MTD device structure
>> + * @chip: nand chip info structure
>> + * @feature_addr: feature address.
>
> As the function conveys that you're setting/getting the features, may 
> be you can drop the prefix from the above addr. Just a thought.
>
>> + * @subfeature_para: the subfeature parameters, a four bytes array.
>
> subfeature_param should be more appropriate.
>
>> + */
>> +static int nand_onfi_set_features(struct mtd_info *mtd, struct 
>> nand_chip *chip,
>> + int feature_addr, uint8_t *subfeature_para)
>> +{
>> + int status;
>> +
>> + if (!chip->onfi_version)
>> + return -EINVAL;
>> +
>> + chip->cmdfunc(mtd, NAND_CMD_SET_FEATURES, feature_addr, -1);
>> + chip->write_buf(mtd, subfeature_para, ONFI_SUBFEATURE_PARA_LEN);
>
> ^ PARAM_LEN here
>
>> + status = chip->waitfunc(mtd, chip);
>> + if (status& NAND_STATUS_FAIL)
>> + return -EIO;
>> + return 0;
>> +}
>> +
>> +/**
>> + * nand_onfi_get_features- [REPLACEABLE] get features for ONFI nand
>> + * @mtd: MTD device structure
>> + * @chip: nand chip info structure
>> + * @feature_addr: feature address.
>> + * @subfeature_para: the subfeature parameters, a four bytes array.
>> + */
>> +static int nand_onfi_get_features(struct mtd_info *mtd, struct 
>> nand_chip *chip,
>> + int feature_addr, uint8_t *subfeature_para)
>> +{
>> + if (!chip->onfi_version)
>> + return -EINVAL;
>> +
>> + /* clear the sub feature parameters */
>> + memset(subfeature_para, 0, ONFI_SUBFEATURE_PARA_LEN);
>> +
>> + chip->cmdfunc(mtd, NAND_CMD_GET_FEATURES, feature_addr, -1);
>> + chip->read_buf(mtd, subfeature_para, ONFI_SUBFEATURE_PARA_LEN);
>> + return 0;
>> +}
>> +
>> +/**
>> * nand_suspend - [MTD Interface] Suspend the NAND flash
>> * @mtd: MTD device structure
>> */
>> @@ -3223,6 +3267,12 @@ int nand_scan_tail(struct mtd_info *mtd)
>> if (!chip->write_page)
>> chip->write_page = nand_write_page;
>>
>> + /* set for ONFI nand */
>> + if (!chip->onfi_set_features)
>> + chip->onfi_set_features = nand_onfi_set_features;
>> + if (!chip->onfi_get_features)
>> + chip->onfi_get_features = nand_onfi_get_features;
>> +
>> /*
>> * Check ECC mode, default to software if 3byte/512byte hardware ECC is
>> * selected and we have 256 byte pagesize fallback to software ECC
>> diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
>> index 8f99d36..641794c 100644
>> --- a/include/linux/mtd/nand.h
>> +++ b/include/linux/mtd/nand.h
>> @@ -92,6 +92,8 @@ extern int nand_unlock(struct mtd_info *mtd, loff_t 
>> ofs, uint64_t len);
>> #define NAND_CMD_READID 0x90
>> #define NAND_CMD_ERASE2 0xd0
>> #define NAND_CMD_PARAM 0xec
>> +#define NAND_CMD_GET_FEATURES 0xee
>> +#define NAND_CMD_SET_FEATURES 0xef
>> #define NAND_CMD_RESET 0xff
>>
>> #define NAND_CMD_LOCK 0x2a
>> @@ -229,6 +231,12 @@ typedef enum {
>> /* Keep gcc happy */
>> struct nand_chip;
>>
>> +/* ONFI feature address */
>> +#define ONFI_FEATURE_ADDR_TIMING_MODE 0x1
>> +
>> +/* ONFI subfeature parameters length */
>> +#define ONFI_SUBFEATURE_PARA_LEN 4
>
> PARAM_LEN
>
>> +
>> struct nand_onfi_params {
>> /* rev info and features block */
>> /* 'O' 'N' 'F' 'I' */
>> @@ -452,6 +460,8 @@ struct nand_buffers {
>> * non 0 if ONFI supported.
>> * @onfi_params: [INTERN] holds the ONFI page parameter when ONFI is
>> * supported, 0 otherwise.
>> + * @onfi_set_features [REPLACEABLE] set the features for ONFI nand
>> + * @onfi_get_features [REPLACEABLE] get the features for ONFI nand
>> * @ecclayout: [REPLACEABLE] the default ECC placement scheme
>> * @bbt: [INTERN] bad block table pointer
>> * @bbt_td: [REPLACEABLE] bad block table descriptor for flash
>> @@ -494,6 +504,10 @@ struct nand_chip {
>> int (*write_page)(struct mtd_info *mtd, struct nand_chip *chip,
>> const uint8_t *buf, int oob_required, int page,
>> int cached, int raw);
>> + int (*onfi_set_features)(struct mtd_info *mtd, struct nand_chip *chip,
>> + int feature_addr, uint8_t *subfeature_para);
>> + int (*onfi_get_features)(struct mtd_info *mtd, struct nand_chip *chip,
>> + int feature_addr, uint8_t *subfeature_para);
>>
>> int chip_delay;
>> unsigned int options;
>
thanks a lot for the review.

I will change them in the next version.

Best Regards
Huang Shijie