From patchwork Thu Oct 24 07:40:06 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mason Yang X-Patchwork-Id: 1182652 X-Patchwork-Delegate: miquel.raynal@bootlin.com Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=lists.infradead.org (client-ip=2607:7c80:54:e::133; helo=bombadil.infradead.org; envelope-from=linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=mxic.com.tw Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="N01vCJTf"; dkim-atps=neutral Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 46zJRl6hcnz9sQr for ; Thu, 24 Oct 2019 18:15:31 +1100 (AEDT) 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:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=td4FTC2xjzh7J+raHEYR78e43bqBXcEnuPi2GiVB5+E=; b=N01vCJTfHnODEBQTku8EZfkkVZ +lTJmDLQD/OBQT+QdwOpzQDO/XWYrXes+zwLik0jJ8rxBKy29+0k3/fUGD0LeYb3gewdjU1w1t+28 Br+pQg5pwwao0dBivJZIuNHeLKV1HMER+5zQJSkt/FHfzqbyPabhYoTNyXSk7WovmhwcKTQUJmeEs dslRw/EZK43/HB2EUTOLITXC2qZWRsr2b9sSXf+x6833KoOXr9Jq8EhDgJXVEXYcx8wFbLd0DDMqU HPPNi4EEBdMMWw96eGKkFOm6V/FmgFuoXV/+yCa/jaXQ0j0HWW5HnASR2YYNdEY9pvXPaVm4sIHMH /6W2WoTw==; 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 1iNXLF-0003mT-6F; Thu, 24 Oct 2019 07:15:29 +0000 Received: from twhmllg4.macronix.com ([122.147.135.202]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1iNXKw-0002AN-9B for linux-mtd@lists.infradead.org; Thu, 24 Oct 2019 07:15:13 +0000 Received: from localhost.localdomain ([172.17.195.96]) by TWHMLLG4.macronix.com with ESMTP id x9O7E52v080302; Thu, 24 Oct 2019 15:14:06 +0800 (GMT-8) (envelope-from masonccyang@mxic.com.tw) From: Mason Yang To: miquel.raynal@bootlin.com, richard@nod.at, marek.vasut@gmail.com, dwmw2@infradead.org, bbrezillon@kernel.org, computersforpeace@gmail.com, vigneshr@ti.com, robh+dt@kernel.org, mark.rutland@arm.com Subject: [PATCH v4 1/2] mtd: rawnand: Add support for Macronix NAND randomizer Date: Thu, 24 Oct 2019 15:40:06 +0800 Message-Id: <1571902807-10388-2-git-send-email-masonccyang@mxic.com.tw> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1571902807-10388-1-git-send-email-masonccyang@mxic.com.tw> References: <1571902807-10388-1-git-send-email-masonccyang@mxic.com.tw> X-MAIL: TWHMLLG4.macronix.com x9O7E52v080302 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191024_001510_595076_DABD2670 X-CRM114-Status: GOOD ( 10.87 ) X-Spam-Score: 0.0 (/) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (0.0 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [122.147.135.202 listed in list.dnswl.org] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record 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: juliensu@mxic.com.tw, devicetree@vger.kernel.org, masonccyang@mxic.com.tw, linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org MIME-Version: 1.0 Sender: "linux-mtd" Errors-To: linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org Macronix NANDs support randomizer operation for user data scrambled, which can be enabled with a SET_FEATURE. User data written to the NAND device without randomizer is still readable after randomizer function enabled. The penalty of randomizer are subpage accesses prohibited and more time period is needed in program operation and entering deep power-down mode. i.e., tPROG 300us to 340us(randomizer enabled) For more high-reliability concern, if subpage write not available with hardware ECC and then to enable randomizer is recommended by default. Driver checks byte 167 of Vendor Blocks in ONFI parameter page table to see if this high-reliability function is supported. By adding a new specific DT property in children nodes to enable randomizer function. Signed-off-by: Mason Yang Reviewed-by: Miquel Raynal --- drivers/mtd/nand/raw/nand_macronix.c | 69 ++++++++++++++++++++++++++++++++++++ 1 file changed, 69 insertions(+) diff --git a/drivers/mtd/nand/raw/nand_macronix.c b/drivers/mtd/nand/raw/nand_macronix.c index 58511ae..89101fa 100644 --- a/drivers/mtd/nand/raw/nand_macronix.c +++ b/drivers/mtd/nand/raw/nand_macronix.c @@ -11,6 +11,14 @@ #define MACRONIX_READ_RETRY_BIT BIT(0) #define MACRONIX_NUM_READ_RETRY_MODES 6 +#define MACRONIX_RANDOMIZER_BIT BIT(1) +#define ONFI_FEATURE_ADDR_MXIC_RANDOMIZER 0xB0 +#define ENPGM BIT(0) +#define RANDEN BIT(1) +#define RANDOPT BIT(2) +#define MACRONIX_RANDOMIZER_MODE_ENTER (ENPGM | RANDEN | RANDOPT) +#define MACRONIX_RANDOMIZER_MODE_EXIT (RANDEN | RANDOPT) + struct nand_onfi_vendor_macronix { u8 reserved; u8 reliability_func; @@ -29,15 +37,76 @@ static int macronix_nand_setup_read_retry(struct nand_chip *chip, int mode) return nand_set_features(chip, ONFI_FEATURE_ADDR_READ_RETRY, feature); } +static int macronix_nand_randomizer_check_enable(struct nand_chip *chip) +{ + u8 feature[ONFI_SUBFEATURE_PARAM_LEN]; + int ret; + + ret = nand_get_features(chip, ONFI_FEATURE_ADDR_MXIC_RANDOMIZER, + feature); + if (ret < 0) + return ret; + + if (feature[0]) + return feature[0]; + + feature[0] = MACRONIX_RANDOMIZER_MODE_ENTER; + ret = nand_set_features(chip, ONFI_FEATURE_ADDR_MXIC_RANDOMIZER, + feature); + if (ret < 0) + return ret; + + /* RANDEN and RANDOPT OTP bits are programmed */ + feature[0] = 0x0; + ret = nand_prog_page_op(chip, 0, 0, feature, 1); + if (ret < 0) + return ret; + + ret = nand_get_features(chip, ONFI_FEATURE_ADDR_MXIC_RANDOMIZER, + feature); + if (ret < 0) + return ret; + + feature[0] &= MACRONIX_RANDOMIZER_MODE_EXIT; + ret = nand_set_features(chip, ONFI_FEATURE_ADDR_MXIC_RANDOMIZER, + feature); + if (ret < 0) + return ret; + + return feature[0]; +} + static void macronix_nand_onfi_init(struct nand_chip *chip) { struct nand_parameters *p = &chip->parameters; struct nand_onfi_vendor_macronix *mxic; + struct device_node *dn = nand_get_flash_node(chip); + int rand_otp = 0; + int ret; if (!p->onfi) return; + if (of_find_property(dn, "mxic,enable-randomizer-otp", NULL)) + rand_otp = 1; + mxic = (struct nand_onfi_vendor_macronix *)p->onfi->vendor; + /* Subpage write is prohibited in randomizer operatoin */ + if (rand_otp && chip->options & NAND_NO_SUBPAGE_WRITE && + mxic->reliability_func & MACRONIX_RANDOMIZER_BIT) { + if (p->supports_set_get_features) { + bitmap_set(p->set_feature_list, + ONFI_FEATURE_ADDR_MXIC_RANDOMIZER, 1); + bitmap_set(p->get_feature_list, + ONFI_FEATURE_ADDR_MXIC_RANDOMIZER, 1); + ret = macronix_nand_randomizer_check_enable(chip); + if (ret < 0) + pr_info("Macronix NAND randomizer failed\n"); + else + pr_info("Macronix NAND randomizer enabled\n"); + } + } + if ((mxic->reliability_func & MACRONIX_READ_RETRY_BIT) == 0) return;