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SubjectRe: [PATCH] nand: davinci: add support for 4K page size nand devices

On 05/12/2014 06:21 PM, Santosh Shilimkar wrote:
> On Thursday 08 May 2014 06:31 PM, Ivan Khoronzhuk wrote:
>> From: Sandeep Paulraj <s-paulraj@ti.com>
>>
>> It is needed for k2l keystone2 EVM which uses NAND flash with 4K page
>> size, hence add support for 4K page size nand devices.
>>
>> Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>
>> Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@ti.com>
>> ---
>>
>> Based on l2-mtd/master
>>
>> drivers/mtd/nand/davinci_nand.c | 41 ++++++++++++++++++++++++++++++-----------
>> 1 file changed, 30 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/mtd/nand/davinci_nand.c b/drivers/mtd/nand/davinci_nand.c
>> index b922c8e..24a5769 100644
>> --- a/drivers/mtd/nand/davinci_nand.c
>> +++ b/drivers/mtd/nand/davinci_nand.c
>> @@ -520,6 +520,31 @@ static struct nand_ecclayout hwecc4_2048 = {
>> },
>> };
>>
>> +/* An ECC layout for using 4-bit ECC with large-page (4096bytes) flash,
>> + * storing ten ECC bytes plus the manufacturer's bad block marker byte,
>> + * and not overlapping the default BBT markers.
>> + */
> Comment style ....
> /*
> *
> */

yes

>> +static struct nand_ecclayout hwecc4_4096 __initconst = {
>> + .eccbytes = 80,
>> + .eccpos = {
>> + /* at the end of spare sector */
>> + 48, 49, 50, 51, 52, 53, 54, 55, 56, 57,
>> + 58, 59, 60, 61, 62, 63, 64, 65, 66, 67,
>> + 68, 69, 70, 71, 72, 73, 74, 75, 76, 77,
>> + 78, 79, 80, 81, 82, 83, 84, 85, 86, 87,
>> + 88, 89, 90, 91, 92, 93, 94, 95, 96, 97,
>> + 98, 99, 100, 101, 102, 103, 104, 105, 106, 107,
>> + 108, 109, 110, 111, 112, 113, 114, 115, 116, 117,
>> + 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
>> + },
>> + .oobfree = {
>> + /* 2 bytes at offset 0 hold manufacturer badblock markers */
>> + {.offset = 2, .length = 46, },
>> + /* 5 bytes at offset 8 hold BBT markers */
>> + /* 8 bytes at offset 16 hold JFFS2 clean markers */
>> + },
>> +};
>> +
>> #if defined(CONFIG_OF)
>> static const struct of_device_id davinci_nand_of_match[] = {
>> {.compatible = "ti,davinci-nand", },
>> @@ -796,18 +821,12 @@ static int nand_davinci_probe(struct platform_device *pdev)
>> info->chip.ecc.mode = NAND_ECC_HW_OOB_FIRST;
>> goto syndrome_done;
>> }
>> + if (chunks == 8) {
> May be use some meaning macros instead of magic value '8'

It just continues style used in the code:

if (chunks == 1) {
...
if (chunks == 4) {
...
if (chunks == 8) {
...

>
>> + info->ecclayout = hwecc4_4096;
>> + info->chip.ecc.mode = NAND_ECC_HW_OOB_FIRST;
>> + goto syndrome_done;
>> + }
>>
>> - /* 4KiB page chips are not yet supported. The eccpos from
>> - * nand_ecclayout cannot hold 80 bytes and change to eccpos[]
>> - * breaks userspace ioctl interface with mtd-utils. Once we
>> - * resolve this issue, NAND_ECC_HW_OOB_FIRST mode can be used
>> - * for the 4KiB page chips.
>> - *
>> - * TODO: Note that nand_ecclayout has now been expanded and can
>> - * hold plenty of OOB entries.
>> - */
>> - dev_warn(&pdev->dev, "no 4-bit ECC support yet "
>> - "for 4KiB-page NAND\n");
>> ret = -EIO;
>> goto err;
>>
>>

--
Regards,
Ivan Khoronzhuk



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