From: Miquel Raynal <miquel.raynal@bootlin.com>
To: Richard Weinberger <richard@nod.at>,
Vignesh Raghavendra <vigneshr@ti.com>,
Tudor Ambarus <Tudor.Ambarus@microchip.com>,
<linux-mtd@lists.infradead.org>
Cc: Julien Su <juliensu@mxic.com.tw>,
ycllin@mxic.com.tw,
Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
Miquel Raynal <miquel.raynal@bootlin.com>
Subject: [PATCH 18/20] mtd: nand: ecc-hamming: Let the software Hamming ECC engine be unselected
Date: Wed, 30 Sep 2020 01:01:22 +0200 [thread overview]
Message-ID: <20200929230124.31491-19-miquel.raynal@bootlin.com> (raw)
In-Reply-To: <20200929230124.31491-1-miquel.raynal@bootlin.com>
There is no reason to always embed the software Hamming ECC engine
implementation. By default it is (with raw NAND), but we can let the
user decide.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
---
drivers/mtd/nand/Kconfig | 11 +++++++-
drivers/mtd/nand/raw/Kconfig | 2 +-
include/linux/mtd/nand-ecc-sw-hamming.h | 36 +++++++++++++++++++++++++
3 files changed, 47 insertions(+), 2 deletions(-)
diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index 306c33ca3448..15ffe1a1b863 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -16,7 +16,16 @@ config MTD_NAND_ECC
depends on MTD_NAND_CORE
config MTD_NAND_ECC_SW_HAMMING
- bool
+ bool "Software Hamming ECC engine"
+ default y if MTD_RAW_NAND
+ select MTD_NAND_ECC
+ help
+ This enables support for software Hamming error
+ correction. This correction can correct up to 1 bit error
+ per chunk and detect up to 2 bit errors. While it used to be
+ widely used with old parts, newer NAND chips usually require
+ more strength correction and in this case BCH or RS will be
+ preferred.
config MTD_NAND_ECC_SW_HAMMING_SMC
bool "NAND ECC Smart Media byte order"
diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
index 6149096e32cb..cc86d6e4e042 100644
--- a/drivers/mtd/nand/raw/Kconfig
+++ b/drivers/mtd/nand/raw/Kconfig
@@ -3,7 +3,6 @@ menuconfig MTD_RAW_NAND
tristate "Raw/Parallel NAND Device Support"
select MTD_NAND_CORE
select MTD_NAND_ECC
- select MTD_NAND_ECC_SW_HAMMING
help
This enables support for accessing all type of raw/parallel
NAND flash devices. For further information see
@@ -72,6 +71,7 @@ config MTD_NAND_AU1550
config MTD_NAND_NDFC
tristate "IBM/MCC 4xx NAND controller"
depends on 4xx
+ select MTD_NAND_ECC_SW_HAMMING
select MTD_NAND_ECC_SW_HAMMING_SMC
help
NDFC Nand Flash Controllers are integrated in IBM/AMCC's 4xx SoCs
diff --git a/include/linux/mtd/nand-ecc-sw-hamming.h b/include/linux/mtd/nand-ecc-sw-hamming.h
index 9d4b4d623741..5a39e96c3546 100644
--- a/include/linux/mtd/nand-ecc-sw-hamming.h
+++ b/include/linux/mtd/nand-ecc-sw-hamming.h
@@ -32,6 +32,8 @@ struct nand_ecc_sw_hamming_conf {
unsigned int sm_order;
};
+#if IS_ENABLED(CONFIG_MTD_NAND_ECC_SW_HAMMING)
+
int ecc_sw_hamming_calculate(const unsigned char *buf, unsigned int step_size,
unsigned char *code, bool sm_order);
int nand_ecc_sw_hamming_calculate(struct nand_device *nand,
@@ -44,4 +46,38 @@ int nand_ecc_sw_hamming_correct(struct nand_device *nand, unsigned char *buf,
unsigned char *read_ecc,
unsigned char *calc_ecc);
+#else /* !CONFIG_MTD_NAND_ECC_SW_HAMMING */
+
+static inline int ecc_sw_hamming_calculate(const unsigned char *buf,
+ unsigned int step_size,
+ unsigned char *code, bool sm_order)
+{
+ return -ENOTSUPP;
+}
+
+static inline int nand_ecc_sw_hamming_calculate(struct nand_device *nand,
+ const unsigned char *buf,
+ unsigned char *code)
+{
+ return -ENOTSUPP;
+}
+
+static inline int ecc_sw_hamming_correct(unsigned char *buf,
+ unsigned char *read_ecc,
+ unsigned char *calc_ecc,
+ unsigned int step_size, bool sm_order)
+{
+ return -ENOTSUPP;
+}
+
+static inline int nand_ecc_sw_hamming_correct(struct nand_device *nand,
+ unsigned char *buf,
+ unsigned char *read_ecc,
+ unsigned char *calc_ecc)
+{
+ return -ENOTSUPP;
+}
+
+#endif /* CONFIG_MTD_NAND_ECC_SW_HAMMING */
+
#endif /* __MTD_NAND_ECC_SW_HAMMING_H__ */
--
2.20.1
______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/
next prev parent reply other threads:[~2020-09-29 23:04 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-29 23:01 [PATCH 00/20] Create generic software ECC engines Miquel Raynal
2020-09-29 23:01 ` [PATCH 01/20] mtd: nand: ecc: Add an I/O request tweaking mechanism Miquel Raynal
2020-09-30 7:53 ` Thomas Petazzoni
2020-09-30 8:16 ` Miquel Raynal
2020-10-30 17:30 ` Miquel Raynal
2020-09-29 23:01 ` [PATCH 02/20] mtd: nand: ecc-bch: Move BCH code to the generic NAND layer Miquel Raynal
2020-10-30 17:30 ` Miquel Raynal
2020-09-29 23:01 ` [PATCH 03/20] mtd: nand: ecc-bch: Cleanup and style fixes Miquel Raynal
2020-10-30 17:30 ` Miquel Raynal
2020-09-29 23:01 ` [PATCH 04/20] mtd: nand: ecc-bch: Stop exporting the private structure Miquel Raynal
2021-01-09 14:46 ` Adam Ford
2021-01-11 10:20 ` Miquel Raynal
2021-01-12 14:35 ` Miquel Raynal
2021-01-12 16:01 ` Adam Ford
2021-01-12 17:20 ` Adam Ford
2021-01-14 15:42 ` Miquel Raynal
2021-01-15 12:23 ` Adam Ford
2021-01-15 16:06 ` Adam Ford
2021-01-15 16:17 ` Miquel Raynal
2021-01-15 16:28 ` Adam Ford
2021-01-19 11:56 ` Miquel Raynal
2021-01-19 14:21 ` Adam Ford
2021-01-19 14:36 ` Miquel Raynal
2021-01-19 15:49 ` Adam Ford
2021-01-19 15:53 ` Miquel Raynal
2020-09-29 23:01 ` [PATCH 05/20] mtd: nand: ecc-bch: Return only valid error codes Miquel Raynal
2020-10-30 17:29 ` Miquel Raynal
2020-09-29 23:01 ` [PATCH 06/20] mtd: nand: ecc-bch: Drop mtd_nand_has_bch() Miquel Raynal
2020-10-30 17:29 ` Miquel Raynal
2020-09-29 23:01 ` [PATCH 07/20] mtd: nand: ecc-bch: Update the prototypes to be more generic Miquel Raynal
2020-10-30 17:29 ` Miquel Raynal
2020-09-29 23:01 ` [PATCH 08/20] mtd: nand: ecc-bch: Stop using raw NAND structures Miquel Raynal
2020-09-29 23:01 ` [PATCH 09/20] mtd: nand: ecc-bch: Create the software BCH engine Miquel Raynal
2020-10-30 17:29 ` Miquel Raynal
2020-09-29 23:01 ` [PATCH 10/20] mtd: rawnand: Get rid of chip->ecc.priv Miquel Raynal
2020-10-30 17:29 ` Miquel Raynal
2020-09-29 23:01 ` [PATCH 11/20] mtd: nand: ecc-hamming: Move Hamming code to the generic NAND layer Miquel Raynal
2020-09-29 23:01 ` [PATCH 12/20] mtd: nand: ecc-hamming: Clarify the driver descriptions Miquel Raynal
2020-10-30 17:29 ` Miquel Raynal
2020-09-29 23:01 ` [PATCH 13/20] mtd: nand: ecc-hamming: Drop/fix the kernel doc Miquel Raynal
2020-10-30 17:29 ` Miquel Raynal
2020-09-29 23:01 ` [PATCH 14/20] mtd: nand: ecc-hamming: Cleanup and style fixes Miquel Raynal
2020-10-30 17:29 ` Miquel Raynal
2020-09-29 23:01 ` [PATCH 15/20] mtd: nand: ecc-hamming: Rename the exported functions Miquel Raynal
2020-10-30 17:29 ` Miquel Raynal
2020-09-29 23:01 ` [PATCH 16/20] mtd: nand: ecc-hamming: Stop using raw NAND structures Miquel Raynal
2020-10-30 17:29 ` Miquel Raynal
2020-09-29 23:01 ` [PATCH 17/20] mtd: nand: ecc-hamming: Remove useless includes Miquel Raynal
2020-09-29 23:01 ` Miquel Raynal [this message]
2020-10-30 17:29 ` [PATCH 18/20] mtd: nand: ecc-hamming: Let the software Hamming ECC engine be unselected Miquel Raynal
2020-09-29 23:01 ` [PATCH 19/20] mtd: nand: ecc-hamming: Create the software Hamming engine Miquel Raynal
2020-10-30 17:28 ` Miquel Raynal
2020-09-29 23:01 ` [PATCH 20/20] mtd: nand: Let software ECC engines be retrieved from the NAND core Miquel Raynal
2020-10-30 17:28 ` Miquel Raynal
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200929230124.31491-19-miquel.raynal@bootlin.com \
--to=miquel.raynal@bootlin.com \
--cc=Tudor.Ambarus@microchip.com \
--cc=juliensu@mxic.com.tw \
--cc=linux-mtd@lists.infradead.org \
--cc=richard@nod.at \
--cc=thomas.petazzoni@bootlin.com \
--cc=vigneshr@ti.com \
--cc=ycllin@mxic.com.tw \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).