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nand: pxa3xx: cosmetic: add comments to the timing layout structures

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Add comments with timing parameter names and some details about
nand layout fileds.
Remove unneeded definition.

Signed-off-by: Konstantin Porotchkin <kostap@marvell.com>
Reviewed-by: Igal Liberman <igall@marvell.com>
Cc: Stefan Roese <sr@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Signed-off-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Konstantin Porotchkin 2018-08-29 11:56:16 +03:00 committed by Stefan Roese
parent 2057eb0b16
commit e9a0777f85
1 changed files with 20 additions and 1 deletions
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21
drivers/mtd/nand/pxa3xx_nand.c
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@ -61,7 +61,6 @@ DECLARE_GLOBAL_DATA_PTR;
#define NDCR_NAND_MODE (0x0)
#define NDCR_CLR_PG_CNT (0x1 << 20)
#define NFCV1_NDCR_ARB_CNTL (0x1 << 19)
#define NFCV2_NDCR_STOP_ON_UNCOR (0x1 << 19)
#define NDCR_RD_ID_CNT_MASK (0x7 << 16)
#define NDCR_RD_ID_CNT(x) (((x) << 16) & NDCR_RD_ID_CNT_MASK)
@ -251,6 +250,17 @@ struct pxa3xx_nand_info {
};
static struct pxa3xx_nand_timing timing[] = {
/*
* tCH Enable signal hold time
* tCS Enable signal setup time
* tWH ND_nWE high duration
* tWP ND_nWE pulse time
* tRH ND_nRE high duration
* tRP ND_nRE pulse width
* tR ND_nWE high to ND_nRE low for read
* tWHR ND_nWE high to ND_nRE low for status read
* tAR ND_ALE low to ND_nRE low delay
*/
/*ch cs wh wp rh rp r whr ar */
{ 40, 80, 60, 100, 80, 100, 90000, 400, 40, },
{ 10, 0, 20, 40, 30, 40, 11123, 110, 10, },
@ -260,6 +270,13 @@ static struct pxa3xx_nand_timing timing[] = {
};
static struct pxa3xx_nand_flash builtin_flash_types[] = {
/*
* chip_id
* flash_width Width of Flash memory (DWIDTH_M)
* dfc_width Width of flash controller(DWIDTH_C)
* *timing
* http://www.linux-mtd.infradead.org/nand-data/nanddata.html
*/
{ 0x46ec, 16, 16, &timing[1] },
{ 0xdaec, 8, 8, &timing[1] },
{ 0xd7ec, 8, 8, &timing[1] },
@ -1428,6 +1445,7 @@ static int pxa_ecc_init(struct pxa3xx_nand_info *info,
ecc->size = info->chunk_size;
ecc->layout = &ecc_layout_4KB_bch8bit;
ecc->strength = 16;
} else if (strength == 8 && ecc_stepsize == 512 && page_size == 2048) {
info->ecc_bch = 1;
info->nfullchunks = 1;
@ -1441,6 +1459,7 @@ static int pxa_ecc_init(struct pxa3xx_nand_info *info,
ecc->size = info->chunk_size;
ecc->layout = &ecc_layout_2KB_bch8bit;
ecc->strength = 16;
} else {
dev_err(&info->pdev->dev,
"ECC strength %d at page size %d is not supported\n",