From: Boris Brezillon <bbrezillon@kernel.org> To: Miquel Raynal <miquel.raynal@bootlin.com> Cc: Mason Yang <masonccyang@mxic.com.tw>, Vignesh R <vigneshr@ti.com>, Tudor Ambarus <Tudor.Ambarus@microchip.com>, Julien Su <juliensu@mxic.com.tw>, Richard Weinberger <richard@nod.at>, Schrempf Frieder <frieder.schrempf@kontron.de>, Marek Vasut <marek.vasut@gmail.com>, linux-mtd@lists.infradead.org, Thomas Petazzoni <thomas.petazzoni@bootlin.com>, Brian Norris <computersforpeace@gmail.com>, David Woodhouse <dwmw2@infradead.org>, linux-arm-kernel@lists.infradead.org Subject: Re: [RFC PATCH 24/27] mtd: spinand: Instantiate a SPI-NAND on-die ECC engine Date: Fri, 22 Feb 2019 15:38:53 +0100 [thread overview] Message-ID: <20190222153853.3347b253@kernel.org> (raw) In-Reply-To: <20190221125806.28875-12-miquel.raynal@bootlin.com> On Thu, 21 Feb 2019 13:58:03 +0100 Miquel Raynal <miquel.raynal@bootlin.com> wrote: > 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> > --- > drivers/mtd/nand/spi/on-die-ecc-engine.c | 105 +++++++++++++++++++++ Maybe on-die-ecc.c is enough. To be honest, given the amount of code, I'd even prefer to have this code directly in core.c. > include/linux/mtd/nand-spi-on-die-engine.h | 35 +++++++ Hm, let's make those defs part of the spinand.h file instead of creating a new one. > include/linux/mtd/nand.h | 1 + > 3 files changed, 141 insertions(+) > create mode 100644 include/linux/mtd/nand-spi-on-die-engine.h > > diff --git a/drivers/mtd/nand/spi/on-die-ecc-engine.c b/drivers/mtd/nand/spi/on-die-ecc-engine.c > index 3d5b83238e14..515b9e3efc93 100644 > --- a/drivers/mtd/nand/spi/on-die-ecc-engine.c > +++ b/drivers/mtd/nand/spi/on-die-ecc-engine.c > @@ -45,3 +45,108 @@ int spinand_check_ecc_status(struct spinand_device *spinand, u8 status) > > return -EINVAL; > } > + > +static int spinand_noecc_ooblayout_ecc(struct mtd_info *mtd, int section, > + struct mtd_oob_region *region) > +{ > + return -ERANGE; > +} > + > +static int spinand_noecc_ooblayout_free(struct mtd_info *mtd, int section, > + struct mtd_oob_region *region) > +{ > + if (section) > + return -ERANGE; > + > + /* Reserve 2 bytes for the BBM. */ > + region->offset = 2; > + region->length = 62; > + > + return 0; > +} > + > +static const struct mtd_ooblayout_ops spinand_noecc_ooblayout = { > + .ecc = spinand_noecc_ooblayout_ecc, > + .free = spinand_noecc_ooblayout_free, > +}; > + > +static int ecc_spinand_ondie_init_ctx(struct nand_device *nand) > +{ > + struct spinand_device *spinand = nand_to_spinand(nand); > + struct mtd_info *mtd = nanddev_to_mtd(nand); > + struct ecc_sw_hamming_conf *engine_conf; > + > + 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 ecc_spinand_ondie_cleanup_ctx(struct nand_device *nand) > +{ > + kfree(nand->ecc.ctx.priv); > +} > + > +static int ecc_spinand_ondie_prepare_io_req(struct nand_device *nand, > + struct nand_page_io_req *req, > + void *oobbuf) > +{ > + 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 ecc_spinand_ondie_finish_io_req(struct nand_device *nand, > + struct nand_page_io_req *req, > + void *oobbuf) > +{ > + struct ecc_spinand_ondie_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_engine_ops = { > + .init_ctx = ecc_spinand_ondie_init_ctx, > + .cleanup_ctx = ecc_spinand_ondie_cleanup_ctx, > + .prepare_io_req = ecc_spinand_ondie_prepare_io_req, > + .finish_io_req = ecc_spinand_ondie_finish_io_req, > +}; > + > +static struct nand_ecc_engine spinand_ondie_engine = { > + .ops = &spinand_ondie_engine_ops, > +}; > + > +void spinand_ondie_ecc_save_status(struct nand_device *nand, u8 status) > +{ > + struct ecc_spinand_ondie_conf *engine_conf = nand->ecc.ctx.priv; > + > + if (nand->ecc.engine == &spinand_ondie_engine && engine_conf) > + engine_conf->status = status; > +} > + > +struct nand_ecc_engine *spinand_ondie_ecc_get_engine(void) > +{ > + return &spinand_ondie_engine; Hm, I was expecting to have one engine instance directly embedded in spinand_device. The ECC engine is not a global thing here, it's actually tied to the SPI NAND device itself. > +} ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/
WARNING: multiple messages have this Message-ID (diff)
From: Boris Brezillon <bbrezillon@kernel.org> To: Miquel Raynal <miquel.raynal@bootlin.com> Cc: Mason Yang <masonccyang@mxic.com.tw>, Vignesh R <vigneshr@ti.com>, Tudor Ambarus <Tudor.Ambarus@microchip.com>, Julien Su <juliensu@mxic.com.tw>, Richard Weinberger <richard@nod.at>, Schrempf Frieder <frieder.schrempf@kontron.de>, Marek Vasut <marek.vasut@gmail.com>, linux-mtd@lists.infradead.org, Thomas Petazzoni <thomas.petazzoni@bootlin.com>, Brian Norris <computersforpeace@gmail.com>, David Woodhouse <dwmw2@infradead.org>, linux-arm-kernel@lists.infradead.org Subject: Re: [RFC PATCH 24/27] mtd: spinand: Instantiate a SPI-NAND on-die ECC engine Date: Fri, 22 Feb 2019 15:38:53 +0100 [thread overview] Message-ID: <20190222153853.3347b253@kernel.org> (raw) In-Reply-To: <20190221125806.28875-12-miquel.raynal@bootlin.com> On Thu, 21 Feb 2019 13:58:03 +0100 Miquel Raynal <miquel.raynal@bootlin.com> wrote: > 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> > --- > drivers/mtd/nand/spi/on-die-ecc-engine.c | 105 +++++++++++++++++++++ Maybe on-die-ecc.c is enough. To be honest, given the amount of code, I'd even prefer to have this code directly in core.c. > include/linux/mtd/nand-spi-on-die-engine.h | 35 +++++++ Hm, let's make those defs part of the spinand.h file instead of creating a new one. > include/linux/mtd/nand.h | 1 + > 3 files changed, 141 insertions(+) > create mode 100644 include/linux/mtd/nand-spi-on-die-engine.h > > diff --git a/drivers/mtd/nand/spi/on-die-ecc-engine.c b/drivers/mtd/nand/spi/on-die-ecc-engine.c > index 3d5b83238e14..515b9e3efc93 100644 > --- a/drivers/mtd/nand/spi/on-die-ecc-engine.c > +++ b/drivers/mtd/nand/spi/on-die-ecc-engine.c > @@ -45,3 +45,108 @@ int spinand_check_ecc_status(struct spinand_device *spinand, u8 status) > > return -EINVAL; > } > + > +static int spinand_noecc_ooblayout_ecc(struct mtd_info *mtd, int section, > + struct mtd_oob_region *region) > +{ > + return -ERANGE; > +} > + > +static int spinand_noecc_ooblayout_free(struct mtd_info *mtd, int section, > + struct mtd_oob_region *region) > +{ > + if (section) > + return -ERANGE; > + > + /* Reserve 2 bytes for the BBM. */ > + region->offset = 2; > + region->length = 62; > + > + return 0; > +} > + > +static const struct mtd_ooblayout_ops spinand_noecc_ooblayout = { > + .ecc = spinand_noecc_ooblayout_ecc, > + .free = spinand_noecc_ooblayout_free, > +}; > + > +static int ecc_spinand_ondie_init_ctx(struct nand_device *nand) > +{ > + struct spinand_device *spinand = nand_to_spinand(nand); > + struct mtd_info *mtd = nanddev_to_mtd(nand); > + struct ecc_sw_hamming_conf *engine_conf; > + > + 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 ecc_spinand_ondie_cleanup_ctx(struct nand_device *nand) > +{ > + kfree(nand->ecc.ctx.priv); > +} > + > +static int ecc_spinand_ondie_prepare_io_req(struct nand_device *nand, > + struct nand_page_io_req *req, > + void *oobbuf) > +{ > + 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 ecc_spinand_ondie_finish_io_req(struct nand_device *nand, > + struct nand_page_io_req *req, > + void *oobbuf) > +{ > + struct ecc_spinand_ondie_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_engine_ops = { > + .init_ctx = ecc_spinand_ondie_init_ctx, > + .cleanup_ctx = ecc_spinand_ondie_cleanup_ctx, > + .prepare_io_req = ecc_spinand_ondie_prepare_io_req, > + .finish_io_req = ecc_spinand_ondie_finish_io_req, > +}; > + > +static struct nand_ecc_engine spinand_ondie_engine = { > + .ops = &spinand_ondie_engine_ops, > +}; > + > +void spinand_ondie_ecc_save_status(struct nand_device *nand, u8 status) > +{ > + struct ecc_spinand_ondie_conf *engine_conf = nand->ecc.ctx.priv; > + > + if (nand->ecc.engine == &spinand_ondie_engine && engine_conf) > + engine_conf->status = status; > +} > + > +struct nand_ecc_engine *spinand_ondie_ecc_get_engine(void) > +{ > + return &spinand_ondie_engine; Hm, I was expecting to have one engine instance directly embedded in spinand_device. The ECC engine is not a global thing here, it's actually tied to the SPI NAND device itself. > +} _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-02-22 14:39 UTC|newest] Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-02-21 12:57 [RFC PATCH 13/27] mtd: nand: ecc: Clarify the software Hamming introductory line Miquel Raynal 2019-02-21 12:57 ` Miquel Raynal 2019-02-21 12:57 ` [RFC PATCH 14/27] mtd: nand: ecc: Turn the software Hamming implementation generic Miquel Raynal 2019-02-21 12:57 ` Miquel Raynal 2019-02-21 13:22 ` Boris Brezillon 2019-02-21 13:22 ` Boris Brezillon 2019-02-21 12:57 ` [RFC PATCH 15/27] mtd: nand: Remove useless include about software Hamming ECC Miquel Raynal 2019-02-21 12:57 ` Miquel Raynal 2019-02-21 12:57 ` [RFC PATCH 16/27] mtd: nand: ecc: Let the software BCH ECC engine be a module Miquel Raynal 2019-02-21 12:57 ` Miquel Raynal 2019-02-21 13:48 ` Adam Ford 2019-02-21 13:48 ` Adam Ford 2019-02-21 14:02 ` Miquel Raynal 2019-02-21 14:02 ` Miquel Raynal 2019-02-22 14:24 ` Boris Brezillon 2019-02-22 14:24 ` Boris Brezillon 2019-02-21 12:57 ` [RFC PATCH 17/27] mtd: nand: ecc: Let the software Hamming ECC engine be unselected Miquel Raynal 2019-02-21 12:57 ` Miquel Raynal 2019-02-21 13:20 ` Boris Brezillon 2019-02-21 13:20 ` Boris Brezillon 2019-02-21 13:35 ` Miquel Raynal 2019-02-21 13:35 ` Miquel Raynal 2019-02-21 13:41 ` Boris Brezillon 2019-02-21 13:41 ` Boris Brezillon 2019-02-21 13:46 ` Miquel Raynal 2019-02-21 13:46 ` Miquel Raynal 2019-02-21 12:57 ` [RFC PATCH 18/27] mtd: nand: ecc: Create the software BCH engine instance Miquel Raynal 2019-02-21 12:57 ` Miquel Raynal 2019-02-21 12:57 ` [RFC PATCH 19/27] mtd: nand: ecc: Create the software Hamming " Miquel Raynal 2019-02-21 12:57 ` Miquel Raynal 2019-02-21 12:57 ` [RFC PATCH 20/27] mtd: nand: Let software ECC engines be retrieved from the NAND core Miquel Raynal 2019-02-21 12:57 ` Miquel Raynal 2019-02-22 14:29 ` Boris Brezillon 2019-02-22 14:29 ` Boris Brezillon 2019-02-25 15:49 ` Miquel Raynal 2019-02-25 15:49 ` Miquel Raynal 2019-02-25 16:13 ` Boris Brezillon 2019-02-25 16:13 ` Boris Brezillon 2019-02-26 15:54 ` Miquel Raynal 2019-02-26 15:54 ` Miquel Raynal 2019-02-21 12:58 ` [RFC PATCH 21/27] mtd: spinand: Fix typo in comment Miquel Raynal 2019-02-21 12:58 ` Miquel Raynal 2019-02-22 14:31 ` Boris Brezillon 2019-02-22 14:31 ` Boris Brezillon 2019-02-21 12:58 ` [RFC PATCH 22/27] mtd: spinand: Let the SPI-NAND core flag a SPI-NAND chip Miquel Raynal 2019-02-21 12:58 ` Miquel Raynal 2019-02-22 14:33 ` Boris Brezillon 2019-02-22 14:33 ` Boris Brezillon 2019-02-21 12:58 ` [RFC PATCH 23/27] mtd: spinand: Move the ECC helper functions into a separate file Miquel Raynal 2019-02-21 12:58 ` Miquel Raynal 2019-02-21 12:58 ` [RFC PATCH 24/27] mtd: spinand: Instantiate a SPI-NAND on-die ECC engine Miquel Raynal 2019-02-21 12:58 ` Miquel Raynal 2019-02-22 14:38 ` Boris Brezillon [this message] 2019-02-22 14:38 ` Boris Brezillon 2019-02-21 12:58 ` [RFC PATCH 25/27] mtd: nand: Add helpers to manage ECC engines and configurations Miquel Raynal 2019-02-21 12:58 ` Miquel Raynal 2019-02-22 14:44 ` Boris Brezillon 2019-02-22 14:44 ` Boris Brezillon 2019-02-25 16:01 ` Miquel Raynal 2019-02-25 16:01 ` Miquel Raynal 2019-02-25 16:34 ` Boris Brezillon 2019-02-25 16:34 ` Boris Brezillon 2019-02-25 18:48 ` Boris Brezillon 2019-02-25 18:48 ` Boris Brezillon 2019-02-26 15:59 ` [RFC PATCH 25/27] mtd: nand: Add helpers to manage ECC engines and configurationsND Miquel Raynal 2019-02-26 15:59 ` Miquel Raynal 2019-02-26 16:04 ` Boris Brezillon 2019-02-26 16:04 ` Boris Brezillon 2019-02-27 14:07 ` [RFC PATCH 25/27] mtd: nand: Add helpers to manage ECC engines and configurations Miquel Raynal 2019-02-27 14:07 ` Miquel Raynal 2019-02-27 14:30 ` Boris Brezillon 2019-02-27 14:30 ` Boris Brezillon
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