Re: [PATCH v4 6/9] mtd: rawnand: ingenic: Separate top-level and SoC specific code

[Paul Cercueil]

On Mon, Mar 4, 2019 at 11:20 AM, Miquel Raynal 
<miquel.raynal@xxxxxxxxxxx> wrote:
> Hi Paul,
>
> Paul Cercueil <paul@xxxxxxxxxxxxxxx <mailto:paul@xxxxxxxxxxxxxxx>> 
> wrote on Sat,  9 Feb 2019 16:23:02
> -0300:
>
> >  The ingenic-nand driver uses an API provided by the jz4780-bch 
> > driver.
> >  This makes it difficult to support other SoCs in the jz4780-bch 
> > driver.
> >  To work around this, we separate the API functions from the 
> > SoC-specific
> >  code, so that these API functions are SoC-agnostic.
>
> I like the idea, actually I am working on this separation (see
> [1]) and I would really appreciate that you try to implement the
> interface when it will be available (v2 is coming this week, I think 
> v3
> will be the one to test when raw NAND devices will be properly
> supported). I will add you in Cc: if you want to follow/review.
>
> [1] 
> <http://lists.infradead.org/pipermail/linux-mtd/2019-February/087815.html>

Do you think this will be ready for 5.2?

You can add me in Cc:.

> >  Signed-off-by: Paul Cercueil <paul@xxxxxxxxxxxxxxx 
> > <mailto:paul@xxxxxxxxxxxxxxx>>
> >  ---
> >
> >  v2: Add an optional .probe() callback. It is used for instance to 
> > set
> >      the clock rate in the JZ4780 backend.
> >
> >  v3: The common code is now inside the ingenic-ecc module. Each
> >      SoC-specific ECC code is now in its own module, which leaves to 
> > the
> >      user the choice of which (if any) ECC code should be supported.
> >
> >  v4: No change
> >
> >   drivers/mtd/nand/raw/ingenic/Kconfig        |  17 +++
> >   drivers/mtd/nand/raw/ingenic/Makefile       |   5 +-
> >   drivers/mtd/nand/raw/ingenic/ingenic_ecc.c  | 157 
> > +++++++++++++++++++++++++
> >   drivers/mtd/nand/raw/ingenic/ingenic_ecc.h  |  84 ++++++++++++++
> >   drivers/mtd/nand/raw/ingenic/ingenic_nand.c |  38 +++----
> >   drivers/mtd/nand/raw/ingenic/jz4780_bch.c   | 170 
> > +++++-----------------------
> >   drivers/mtd/nand/raw/ingenic/jz4780_bch.h   |  40 -------
> >   7 files changed, 308 insertions(+), 203 deletions(-)
> >   create mode 100644 drivers/mtd/nand/raw/ingenic/ingenic_ecc.c
> >   create mode 100644 drivers/mtd/nand/raw/ingenic/ingenic_ecc.h
> >   delete mode 100644 drivers/mtd/nand/raw/ingenic/jz4780_bch.h
>
> [...]
>
> >  diff --git a/drivers/mtd/nand/raw/ingenic/ingenic_nand.c 
> > b/drivers/mtd/nand/raw/ingenic/ingenic_nand.c
> >  index 8c73f7c5be9a..0f51fd15fe79 100644
> >  --- a/drivers/mtd/nand/raw/ingenic/ingenic_nand.c
> >  +++ b/drivers/mtd/nand/raw/ingenic/ingenic_nand.c
> >  @@ -22,7 +22,7 @@
> >
> >   #include <linux/jz4780-nemc.h>
> >
> >  -#include "jz4780_bch.h"
> >  +#include "ingenic_ecc.h"
> >
> >   #define DRV_NAME	"ingenic-nand"
> >
> >  @@ -40,7 +40,7 @@ struct ingenic_nand_cs {
> >
> >   struct ingenic_nfc {
> >   	struct device *dev;
> >  -	struct jz4780_bch *bch;
> >  +	struct ingenic_ecc *ecc;
> >   	struct nand_controller controller;
> >   	unsigned int num_banks;
> >   	struct list_head chips;
> >  @@ -124,10 +124,10 @@ static int ingenic_nand_ecc_calculate(struct 
> > nand_chip *chip, const u8 *dat,
> >   {
> >   	struct ingenic_nand *nand = to_ingenic_nand(nand_to_mtd(chip));
> >   	struct ingenic_nfc *nfc = to_ingenic_nfc(nand->chip.controller);
> >  -	struct jz4780_bch_params params;
> >  +	struct ingenic_ecc_params params;
> >
> >   	/*
> >  -	 * Don't need to generate the ECC when reading, BCH does it for 
> > us as
> >  +	 * Don't need to generate the ECC when reading, ECC does it for 
> > us as
>
> "the ECC engine does it for us" would be more meaningful.

OK.

> >   	 * part of decoding/correction.
> >   	 */
> >   	if (nand->reading)
> >  @@ -137,7 +137,7 @@ static int ingenic_nand_ecc_calculate(struct 
> > nand_chip *chip, const u8 *dat,
> >   	params.bytes = nand->chip.ecc.bytes;
> >   	params.strength = nand->chip.ecc.strength;
> >
> >  -	return jz4780_bch_calculate(nfc->bch, &params, dat, ecc_code);
> >  +	return ingenic_ecc_calculate(nfc->ecc, &params, dat, ecc_code);
> >   }
>
> Thanks,
> Miquèl