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mtd: spinand: Instantiate a SPI-NAND on-die ECC engine 

Make use of the existing functions taken from the SPI-NAND core to
instantiate an on-die ECC engine specific to the SPI-NAND core. The
next step will be to tweak the core to use this object instead of
calling the helpers directly.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20200930154109.3922-4-miquel.raynal@bootlin.com
This commit is contained in:
Miquel Raynal 2020-09-30 17:41:07 +02:00
parent 55a1a71a7f
commit 945845b54c
2 changed files with 76 additions and 0 deletions
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67
drivers/mtd/nand/spi/core.c
View File

@ -246,6 +246,73 @@ static const struct mtd_ooblayout_ops spinand_noecc_ooblayout = {
.free = spinand_noecc_ooblayout_free,
};
static int spinand_ondie_ecc_init_ctx(struct nand_device *nand)
{
struct spinand_device *spinand = nand_to_spinand(nand);
struct mtd_info *mtd = nanddev_to_mtd(nand);
struct spinand_ondie_ecc_conf *engine_conf;
nand->ecc.ctx.conf.engine_type = NAND_ECC_ENGINE_TYPE_ON_DIE;
nand->ecc.ctx.conf.step_size = nand->ecc.requirements.step_size;
nand->ecc.ctx.conf.strength = nand->ecc.requirements.strength;
engine_conf = kzalloc(sizeof(*engine_conf), GFP_KERNEL);
if (!engine_conf)
return -ENOMEM;
nand->ecc.ctx.priv = engine_conf;
if (spinand->eccinfo.ooblayout)
mtd_set_ooblayout(mtd, spinand->eccinfo.ooblayout);
else
mtd_set_ooblayout(mtd, &spinand_noecc_ooblayout);
return 0;
}
static void spinand_ondie_ecc_cleanup_ctx(struct nand_device *nand)
{
kfree(nand->ecc.ctx.priv);
}
static int spinand_ondie_ecc_prepare_io_req(struct nand_device *nand,
struct nand_page_io_req *req)
{
struct spinand_device *spinand = nand_to_spinand(nand);
bool enable = (req->mode != MTD_OPS_RAW);
/* Only enable or disable the engine */
return spinand_ecc_enable(spinand, enable);
}
static int spinand_ondie_ecc_finish_io_req(struct nand_device *nand,
struct nand_page_io_req *req)
{
struct spinand_ondie_ecc_conf *engine_conf = nand->ecc.ctx.priv;
struct spinand_device *spinand = nand_to_spinand(nand);
if (req->mode == MTD_OPS_RAW)
return 0;
/* Nothing to do when finishing a page write */
if (req->type == NAND_PAGE_WRITE)
return 0;
/* Finish a page write: check the status, report errors/bitflips */
return spinand_check_ecc_status(spinand, engine_conf->status);
}
static struct nand_ecc_engine_ops spinand_ondie_ecc_engine_ops = {
.init_ctx = spinand_ondie_ecc_init_ctx,
.cleanup_ctx = spinand_ondie_ecc_cleanup_ctx,
.prepare_io_req = spinand_ondie_ecc_prepare_io_req,
.finish_io_req = spinand_ondie_ecc_finish_io_req,
};
static __maybe_unused struct nand_ecc_engine spinand_ondie_ecc_engine = {
.ops = &spinand_ondie_ecc_engine_ops,
};
static int spinand_write_enable_op(struct spinand_device *spinand)
{
struct spi_mem_op op = SPINAND_WR_EN_DIS_OP(true);

9
include/linux/mtd/spinand.h
View File

@ -286,6 +286,15 @@ struct spinand_ecc_info {
#define SPINAND_HAS_QE_BIT BIT(0)
#define SPINAND_HAS_CR_FEAT_BIT BIT(1)
/**
* struct spinand_ondie_ecc_conf - private SPI-NAND on-die ECC engine structure
* @status: status of the last wait operation that will be used in case
* ->get_status() is not populated by the spinand device.
*/
struct spinand_ondie_ecc_conf {
u8 status;
};
/**
* struct spinand_info - Structure used to describe SPI NAND chips
* @model: model name