From patchwork Wed Jan 30 16:38:54 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fabrice Gasnier X-Patchwork-Id: 10788993 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 38B3D6C2 for ; Wed, 30 Jan 2019 16:39:31 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 23AE42FDB6 for ; Wed, 30 Jan 2019 16:39:31 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 156202F65F; Wed, 30 Jan 2019 16:39:31 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 78C032F65F for ; Wed, 30 Jan 2019 16:39:30 +0000 (UTC) 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: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=lh5bEkDubT/ZsTm2MGBDi0MdO6ea87Zs1i8YBnznC1Q=; b=TIyxqaj2nSXYhf j9TQrOmFc2BN2NbneFcJdOxiuvZ7C8fY84wqzjFtTbeimi9jDM34WSLz4C/8oNrs1lgja3ZlH/Xhq Nc9qTYcZlH3/x5mZfNe304XXGFFCyHdoK4vRGkjaO2T14Sn4OIdpNa6pmP+TY+8D6+f2XB+vFcYIa BEsixjgkaGZ6l4s8QkSkhrKmOVGVsk8dYjcdI356W4g2yiW2xPOX8AUMPj49W2Zl90TY8ULxtMaio PTghk9dkeviR3JhotnRDPTuKYKLIsAtggd8ZttcUq0jUp+BCjrI0F5w7hnOyLhlTWMC2Dip1t0JSu xv35y988+t0o2kzQhNcQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gostZ-0004aJ-5a; Wed, 30 Jan 2019 16:39:25 +0000 Received: from mx07-00178001.pphosted.com ([62.209.51.94]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1gostJ-0004O1-VM for linux-arm-kernel@lists.infradead.org; Wed, 30 Jan 2019 16:39:11 +0000 Received: from pps.filterd (m0046037.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x0UGVW1i028413; Wed, 30 Jan 2019 17:39:02 +0100 Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com with ESMTP id 2q8e72a777-1 (version=TLSv1 cipher=ECDHE-RSA-AES256-SHA bits=256 verify=NOT); Wed, 30 Jan 2019 17:39:02 +0100 Received: from zeta.dmz-eu.st.com (zeta.dmz-eu.st.com [164.129.230.9]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 20EC031; Wed, 30 Jan 2019 16:39:02 +0000 (GMT) Received: from Webmail-eu.st.com (sfhdag5node3.st.com [10.75.127.15]) by zeta.dmz-eu.st.com (STMicroelectronics) with ESMTP id ECFDAA71D; Wed, 30 Jan 2019 16:39:01 +0000 (GMT) Received: from localhost (10.75.127.44) by SFHDAG5NODE3.st.com (10.75.127.15) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Wed, 30 Jan 2019 17:39:01 +0100 From: Fabrice Gasnier To: , , Subject: [PATCH 2/4] nvmem: Add driver for STM32 factory-programmed read only mem Date: Wed, 30 Jan 2019 17:38:54 +0100 Message-ID: <1548866336-14765-3-git-send-email-fabrice.gasnier@st.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1548866336-14765-1-git-send-email-fabrice.gasnier@st.com> References: <1548866336-14765-1-git-send-email-fabrice.gasnier@st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.44] X-ClientProxiedBy: SFHDAG7NODE3.st.com (10.75.127.21) To SFHDAG5NODE3.st.com (10.75.127.15) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-01-30_12:, , signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190130_083910_299729_405AFD4A X-CRM114-Status: GOOD ( 14.46 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, lionel.debieve@st.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, mcoquelin.stm32@gmail.com, fabrice.gasnier@st.com, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Add a read only nvmem driver for STM32 factory-programmed memory area (on-chip non-volatile storage). Signed-off-by: Fabrice Gasnier --- drivers/nvmem/Kconfig | 10 ++++++ drivers/nvmem/Makefile | 2 ++ drivers/nvmem/stm32-romem.c | 78 +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 90 insertions(+) create mode 100644 drivers/nvmem/stm32-romem.c diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig index 0a7a470e..f398b18 100644 --- a/drivers/nvmem/Kconfig +++ b/drivers/nvmem/Kconfig @@ -113,6 +113,16 @@ config NVMEM_BCM_OCOTP This driver can also be built as a module. If so, the module will be called nvmem-bcm-ocotp. +config NVMEM_STM32_ROMEM + tristate "STMicroelectronics STM32 factory-programmed memory support" + depends on ARCH_STM32 || COMPILE_TEST + help + Say y here to enable read-only access for STMicroelectronics STM32 + factory-programmed memory area. + + This driver can also be built as a module. If so, the module + will be called nvmem-stm32-romem. + config NVMEM_SUNXI_SID tristate "Allwinner SoCs SID support" depends on ARCH_SUNXI diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile index 4e8c616..e85c946 100644 --- a/drivers/nvmem/Makefile +++ b/drivers/nvmem/Makefile @@ -26,6 +26,8 @@ nvmem_qfprom-y := qfprom.o obj-$(CONFIG_ROCKCHIP_EFUSE) += nvmem_rockchip_efuse.o nvmem_rockchip_efuse-y := rockchip-efuse.o obj-$(CONFIG_NVMEM_SUNXI_SID) += nvmem_sunxi_sid.o +nvmem_stm32_romem-y := stm32-romem.o +obj-$(CONFIG_NVMEM_STM32_ROMEM) += nvmem_stm32_romem.o nvmem_sunxi_sid-y := sunxi_sid.o obj-$(CONFIG_UNIPHIER_EFUSE) += nvmem-uniphier-efuse.o nvmem-uniphier-efuse-y := uniphier-efuse.o diff --git a/drivers/nvmem/stm32-romem.c b/drivers/nvmem/stm32-romem.c new file mode 100644 index 0000000..dadbcc2 --- /dev/null +++ b/drivers/nvmem/stm32-romem.c @@ -0,0 +1,78 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * STM32 Factory-programmed memory read access driver + * + * Copyright (C) 2017, STMicroelectronics - All Rights Reserved + * Author: Fabrice Gasnier for STMicroelectronics. + */ + +#include +#include +#include +#include + +struct stm32_romem_priv { + void __iomem *base; + struct nvmem_config cfg; +}; + +static int stm32_romem_read(void *context, unsigned int offset, void *buf, + size_t bytes) +{ + struct stm32_romem_priv *priv = context; + u8 *buf8 = buf; + int i; + + for (i = offset; i < offset + bytes; i++) + *buf8++ = readb_relaxed(priv->base + i); + + return 0; +} + +static int stm32_romem_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct stm32_romem_priv *priv; + struct resource *res; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + priv->base = devm_ioremap_resource(dev, res); + if (IS_ERR(priv->base)) + return PTR_ERR(priv->base); + + priv->cfg.name = "stm32-romem"; + priv->cfg.read_only = true; + priv->cfg.word_size = 1; + priv->cfg.stride = 1; + priv->cfg.size = resource_size(res); + priv->cfg.reg_read = stm32_romem_read; + priv->cfg.dev = dev; + priv->cfg.priv = priv; + priv->cfg.owner = THIS_MODULE; + + return PTR_ERR_OR_ZERO(devm_nvmem_register(dev, &priv->cfg)); +} + +static const struct of_device_id stm32_romem_of_match[] = { + { .compatible = "st,stm32-romem", }, + {}, +}; +MODULE_DEVICE_TABLE(of, stm32_romem_of_match); + +static struct platform_driver stm32_romem_driver = { + .probe = stm32_romem_probe, + .driver = { + .name = "stm32-romem", + .of_match_table = of_match_ptr(stm32_romem_of_match), + }, +}; +module_platform_driver(stm32_romem_driver); + +MODULE_AUTHOR("Fabrice Gasnier "); +MODULE_DESCRIPTION("STMicroelectronics STM32 RO-MEM"); +MODULE_ALIAS("platform:nvmem-stm32-romem"); +MODULE_LICENSE("GPL v2");