From patchwork Tue Dec 15 15:56:22 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Saenz Julienne X-Patchwork-Id: 344110 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 07D67C4361B for ; Tue, 15 Dec 2020 16:02:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C390E224F4 for ; Tue, 15 Dec 2020 16:02:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730679AbgLOP5b (ORCPT ); Tue, 15 Dec 2020 10:57:31 -0500 Received: from mx2.suse.de ([195.135.220.15]:60844 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730661AbgLOP5Y (ORCPT ); Tue, 15 Dec 2020 10:57:24 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 532BFAD0E; Tue, 15 Dec 2020 15:56:42 +0000 (UTC) From: Nicolas Saenz Julienne To: srinivas.kandagatla@linaro.org, Saenz Julienne , devicetree@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org, linux@armlinux.org.uk, catalin.marinas@arm.com, will@kernel.org, robh+dt@kernel.org, tim.gover@raspberrypi.com, phil@raspberrypi.com Subject: [PATCH 2/6] nvmem: Add driver to expose reserved memory as nvmem Date: Tue, 15 Dec 2020 16:56:22 +0100 Message-Id: <20201215155627.2513-3-nsaenzjulienne@suse.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201215155627.2513-1-nsaenzjulienne@suse.de> References: <20201215155627.2513-1-nsaenzjulienne@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Firmware/co-processors might use reserved memory areas in order to pass data stemming from an nvmem device otherwise non accessible to Linux. For example an EEPROM memory only physically accessible to firmware, or data only accessible early at boot time. In order to expose this data to other drivers and user-space, the driver models the reserved memory area as an nvmem device. Signed-off-by: Nicolas Saenz Julienne --- drivers/nvmem/Kconfig | 8 ++++ drivers/nvmem/Makefile | 2 + drivers/nvmem/rmem.c | 92 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 102 insertions(+) create mode 100644 drivers/nvmem/rmem.c diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig index 954d3b4a52ab..fecc19b884bf 100644 --- a/drivers/nvmem/Kconfig +++ b/drivers/nvmem/Kconfig @@ -270,4 +270,12 @@ config SPRD_EFUSE This driver can also be built as a module. If so, the module will be called nvmem-sprd-efuse. +config NVMEM_RMEM + tristate "Reserved Memory Based Driver Support" + help + This drivers maps reserved memory into an nvmem device. It might be + useful to expose information left by firmware in memory. + + This driver can also be built as a module. If so, the module + will be called nvmem-rmem. endif diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile index a7c377218341..5376b8e0dae5 100644 --- a/drivers/nvmem/Makefile +++ b/drivers/nvmem/Makefile @@ -55,3 +55,5 @@ obj-$(CONFIG_NVMEM_ZYNQMP) += nvmem_zynqmp_nvmem.o nvmem_zynqmp_nvmem-y := zynqmp_nvmem.o obj-$(CONFIG_SPRD_EFUSE) += nvmem_sprd_efuse.o nvmem_sprd_efuse-y := sprd-efuse.o +obj-$(CONFIG_NVMEM_RMEM) += nvmem-rmem.o +nvmem-rmem-y := rmem.o diff --git a/drivers/nvmem/rmem.c b/drivers/nvmem/rmem.c new file mode 100644 index 000000000000..d4fb36db0644 --- /dev/null +++ b/drivers/nvmem/rmem.c @@ -0,0 +1,92 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2020 Nicolas Saenz Julienne + */ + +#include +#include +#include +#include +#include + +struct rmem { + struct device *dev; + struct nvmem_device *nvmem; + struct reserved_mem *rmem; + + const void *base; + phys_addr_t size; +}; + +static int rmem_read(void *context, unsigned int offset, + void *val, size_t bytes) +{ + struct rmem *priv = context; + loff_t off = offset; + + return memory_read_from_buffer(val, bytes, &off, priv->base, priv->size); +} + +static int rmem_probe(struct platform_device *pdev) +{ + struct nvmem_config config = { }; + struct device *dev = &pdev->dev; + struct device_node *rmem_np; + struct reserved_mem *rmem; + struct rmem *priv; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + priv->dev = dev; + + rmem_np = of_parse_phandle(dev->of_node, "memory-region", 0); + if (!rmem_np) { + dev_err(dev, "Failed to lookup reserved memory phandle\n"); + return -EINVAL; + } + + rmem = of_reserved_mem_lookup(rmem_np); + of_node_put(rmem_np); + if (!rmem) { + dev_err(dev, "Failed to lookup reserved memory\n"); + return -EINVAL; + } + + priv->rmem = rmem; + priv->size = rmem->size; + + priv->base = devm_memremap(dev, rmem->base, rmem->size, MEMREMAP_WB); + if (IS_ERR(priv->base)) { + dev_err(dev, "Failed to remap memory region\n"); + return PTR_ERR(priv->base); + } + + config.dev = dev; + config.priv = priv; + config.name = "rmem"; + config.size = priv->size; + config.reg_read = rmem_read; + + priv->nvmem = devm_nvmem_register(dev, &config); + return PTR_ERR_OR_ZERO(priv->nvmem); +} + +static const struct of_device_id rmem_match[] = { + { .compatible = "nvmem-rmem", }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, rmem_match); + +static struct platform_driver rmem_driver = { + .probe = rmem_probe, + .driver = { + .name = "rmem", + .of_match_table = rmem_match, + }, +}; +module_platform_driver(rmem_driver); + +MODULE_AUTHOR("Nicolas Saenz Julienne "); +MODULE_DESCRIPTION("Reserved Memory Based nvmem Driver"); +MODULE_LICENSE("GPL");