From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_2 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BB3F1C83000 for ; Wed, 29 Apr 2020 16:15:25 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 83EE0206F0 for ; Wed, 29 Apr 2020 16:15:25 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="HM/GVU0M" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 83EE0206F0 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=collabora.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=OV8xpjWZbRab8/geKDy4piq0NPVgWEY52as3sc3r7Vg=; b=HM/GVU0MRbdVgg yTS0fiAH5dqXC/ry7ab7RCcHPZKCgQDVNrGZJeD2JKdLb+9OqARignf1olBMpaUSVIhQgvUHmCtNo /inyQ5cIOrWhOMd4aAqs/fgwN9eo4VksMlj85wN2ChWbbVgFE4XDFWdZkmaPsivv9ScaTBn0m7zQd xKR3uNoxB0Xsq97PgWGXEklvuk8L5nPl36bajC4hnK5fkZ4k7wQ0L7UTbHqydpQfQlTRIB7twW/eN nCliEuESl0+i9QbsFUMcptW3KM/0h9nFVrUzJWMuaIga7RToN6Wckj2CSNRQd9og2EgcD+Ee2+4JV 3qXD29uwu/mwj6i5OgBw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jTpMj-0005P0-Qe; Wed, 29 Apr 2020 16:15:17 +0000 Received: from bhuna.collabora.co.uk ([2a00:1098:0:82:1000:25:2eeb:e3e3]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jTpMf-0005OO-To for linux-mtd@lists.infradead.org; Wed, 29 Apr 2020 16:15:15 +0000 Received: from localhost (unknown [IPv6:2a01:e0a:2c:6930:5cf4:84a1:2763:fe0d]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: bbrezillon) by bhuna.collabora.co.uk (Postfix) with ESMTPSA id 8DBF32A068C; Wed, 29 Apr 2020 17:15:12 +0100 (BST) Date: Wed, 29 Apr 2020 18:15:09 +0200 From: Boris Brezillon To: Miquel Raynal Subject: Re: [PATCH v2 09/11] mtd: rawnand: Expose monolithic read/write_page_raw() helpers Message-ID: <20200429181509.657aa2e5@collabora.com> In-Reply-To: <20200429155540.22048-10-miquel.raynal@bootlin.com> References: <20200429155540.22048-1-miquel.raynal@bootlin.com> <20200429155540.22048-10-miquel.raynal@bootlin.com> Organization: Collabora X-Mailer: Claws Mail 3.17.5 (GTK+ 2.24.32; x86_64-redhat-linux-gnu) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200429_091514_235733_3E530F42 X-CRM114-Status: GOOD ( 20.92 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Michal Simek , Vignesh Raghavendra , Tudor Ambarus , Richard Weinberger , linux-mtd@lists.infradead.org, Thomas Petazzoni , Naga Sureshkumar Relli Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org On Wed, 29 Apr 2020 17:55:38 +0200 Miquel Raynal wrote: > The current nand_read/write_page_raw() helpers are already widely used > but do not fit the purpose of "constrained" controllers which cannot, > for instance, separate command/address cycles with data cycles. > > Workaround this issue by proposing alternative helpers that cannot be > used by controller drivers instead. > > Signed-off-by: Miquel Raynal > --- > drivers/mtd/nand/raw/nand_base.c | 60 ++++++++++++++++++++++++++++++++ > include/linux/mtd/rawnand.h | 8 +++-- > 2 files changed, 66 insertions(+), 2 deletions(-) > > diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c > index 15a9189b2307..2e525cb5a4e4 100644 > --- a/drivers/mtd/nand/raw/nand_base.c > +++ b/drivers/mtd/nand/raw/nand_base.c > @@ -2629,6 +2629,39 @@ int nand_read_page_raw(struct nand_chip *chip, uint8_t *buf, int oob_required, > } > EXPORT_SYMBOL(nand_read_page_raw); > > +/** > + * nand_monolithic_read_page_raw - Read raw page data without ECC in one go Maybe "Read the full page (data + OOB) with ECC engine disabled" ? > + * @chip: nand chip info structure > + * @buf: buffer to store read data > + * @oob_required: caller requires OOB data read to chip->oob_poi > + * @page: page number to read > + */ > +int nand_monolithic_read_page_raw(struct nand_chip *chip, u8 *buf, > + int oob_required, int page) > +{ > + struct mtd_info *mtd = nand_to_mtd(chip); > + unsigned int size = mtd->writesize; > + u8 *read_buf = buf; > + int ret; > + > + if (oob_required) { > + size += mtd->oobsize; > + > + if (buf != chip->data_buf) > + read_buf = nand_get_data_buf(chip); > + } > + > + ret = nand_read_page_op(chip, page, 0, read_buf, size); > + if (ret) > + return ret; > + > + if (buf != chip->data_buf) > + memcpy(buf, read_buf, mtd->writesize); > + > + return 0; > +} > +EXPORT_SYMBOL(nand_monolithic_read_page_raw); > + > /** > * nand_read_page_raw_syndrome - [INTERN] read raw page data without ecc > * @chip: nand chip info structure > @@ -3636,6 +3669,33 @@ int nand_write_page_raw(struct nand_chip *chip, const uint8_t *buf, > } > EXPORT_SYMBOL(nand_write_page_raw); > > +/** > + * nand_monolithic_write_page_raw - Raw page write in one go Maybe we should have a consistent description for those helpers: "Write the full page (data + OOB) with ECC engine disabled" ? > + * @chip: NAND chip info structure > + * @buf: data buffer > + * @oob_required: must write chip->oob_poi to OOB > + * @page: page number to write > + */ > +int nand_monolithic_write_page_raw(struct nand_chip *chip, const u8 *buf, > + int oob_required, int page) > +{ > + struct mtd_info *mtd = nand_to_mtd(chip); > + unsigned int size = mtd->writesize; > + u8 *write_buf = (u8 *)buf; > + > + if (oob_required) { > + size += mtd->oobsize; > + > + if (buf != chip->data_buf) { > + write_buf = nand_get_data_buf(chip); > + memcpy(write_buf, buf, mtd->writesize); > + } > + } > + > + return nand_prog_page_op(chip, page, 0, write_buf, size); > +} > +EXPORT_SYMBOL(nand_monolithic_write_page_raw); > + > /** > * nand_write_page_raw_syndrome - [INTERN] raw page write function > * @chip: nand chip info structure > diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h > index d40ad19ba0f6..0da10e99cf39 100644 > --- a/include/linux/mtd/rawnand.h > +++ b/include/linux/mtd/rawnand.h > @@ -1328,13 +1328,17 @@ int nand_read_oob_std(struct nand_chip *chip, int page); > int nand_get_set_features_notsupp(struct nand_chip *chip, int addr, > u8 *subfeature_param); > > -/* Default read_page_raw implementation */ > +/* Default read_page_raw implementations */ Well, nand_monolithic_read_page_raw() is not the default :p. Just drop the "Default " and it should be good. > int nand_read_page_raw(struct nand_chip *chip, uint8_t *buf, int oob_required, > int page); > +int nand_monolithic_read_page_raw(struct nand_chip *chip, uint8_t *buf, > + int oob_required, int page); > > -/* Default write_page_raw implementation */ > +/* Default write_page_raw implementations */ Ditto. > int nand_write_page_raw(struct nand_chip *chip, const uint8_t *buf, > int oob_required, int page); > +int nand_monolithic_write_page_raw(struct nand_chip *chip, const uint8_t *buf, > + int oob_required, int page); > > /* Reset and initialize a NAND device */ > int nand_reset(struct nand_chip *chip, int chipnr); ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/