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

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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






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