From patchwork Tue Mar 30 13:48:18 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cristian Ciocaltea X-Patchwork-Id: 413108 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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT 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 DED20C433DB for ; Tue, 30 Mar 2021 13:49:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B38EC619C6 for ; Tue, 30 Mar 2021 13:49:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232211AbhC3Ns5 (ORCPT ); Tue, 30 Mar 2021 09:48:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36600 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232166AbhC3Ns3 (ORCPT ); Tue, 30 Mar 2021 09:48:29 -0400 Received: from mail-ej1-x630.google.com (mail-ej1-x630.google.com [IPv6:2a00:1450:4864:20::630]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 31A2EC061574; Tue, 30 Mar 2021 06:48:29 -0700 (PDT) Received: by mail-ej1-x630.google.com with SMTP id u5so24946406ejn.8; Tue, 30 Mar 2021 06:48:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=IQNp9e99+CznjYBoYW2Ihp1ygelCyBUZZbzQRo6GGr8=; b=G1o9Rkz9FtzPcp+l4sSBsJQj/3Mwf7NzOceH9vbHufY1TauuRP/2My0JfItP0cty4m 1HqmaRuL1OSxbuxr/6rvm0XQWufXmX+sQ6DVVI1Jm1Rk+rseS6/eJr1MFm4fdhPmCC6J fb15RunDfnaKJmziuu6t+hOQ+Pq4zqK2dmcuLTk++CzJm4dXi6dC0iovSU2QIcWbcabt VJu/NEz/mNylp6TsoopTIPD+ziqb2QO5Ukf4FYKS0WdEqHnkjTjCqKx/cArExs/bvG+w LF5E37VK1VLt/jyoEMQKvbUIOVR1ep2D1pIiV273FgDBIkdtm1GAaULuCwamL9f6kGMJ OrSQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=IQNp9e99+CznjYBoYW2Ihp1ygelCyBUZZbzQRo6GGr8=; b=iK8r83qnbmW/d4XTb8LCX1xNWQh81Sj2el7ABJ6vu684TMBWFpFpLofLWKI7Z8YeSs VJU7kNZ6hkOR/GkykDWuyry2kYZAjafMMV+g6Du8HvrnqbnWC/e6fE5z6hfVwJHMPWeu S4ynzylUeOB3ZhkRNuP22YyMRJOAkE/RG9z3q6rRRDYLfv70L4koais2yIOwp1XQYGTo KGUPS7DMMdk0oXEFlQZOozSf0ONIU5EAizzlF7LStKIGfoMeEqF+a/AdzOjAWDP5dBM+ VdiH9fFwX3xbFOQa+40Fs6t2UuQ/VlpJOb4KNJYqlF2f8u3yfBBjwOA7POnoF4+zFOms N8rQ== X-Gm-Message-State: AOAM531GWnkLBDmGP1KFOStxTgWEWze5gu6D2Urb1/NX8EY/hzAB2fZw hPA0z6gkD6Av4DCPzab0i4W4WZCMpBc= X-Google-Smtp-Source: ABdhPJwmpTmSEhHKPFX+Gag8UZV17t9O4rdo2b3PZeI0aAglbRUocNpMnqK/oy1fxn97+JHlauWEyA== X-Received: by 2002:a17:906:4410:: with SMTP id x16mr33463963ejo.446.1617112107934; Tue, 30 Mar 2021 06:48:27 -0700 (PDT) Received: from localhost.localdomain ([188.24.140.160]) by smtp.gmail.com with ESMTPSA id l12sm11114681edb.39.2021.03.30.06.48.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 30 Mar 2021 06:48:27 -0700 (PDT) From: Cristian Ciocaltea To: Rob Herring , =?utf-8?q?Andreas_F=C3=A4rber?= , Manivannan Sadhasivam Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-actions@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 3/6] soc: actions: Add Actions Semi Owl socinfo driver Date: Tue, 30 Mar 2021 16:48:18 +0300 Message-Id: <75ec4eff3e6113f4e72daa1b428c355b28005297.1617110420.git.cristian.ciocaltea@gmail.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org The driver provides information about the Action Semi Owl family of SoCs (S500, S700 and S900) to user space via sysfs: machine, family, soc_id, serial_number. Note the serial number is currently provided only for the S500 SoC variant. Signed-off-by: Cristian Ciocaltea --- drivers/soc/actions/Kconfig | 8 + drivers/soc/actions/Makefile | 1 + drivers/soc/actions/owl-socinfo.c | 152 ++++++++++++++++++ include/linux/soc/actions/owl-serial-number.h | 20 +++ 4 files changed, 181 insertions(+) create mode 100644 drivers/soc/actions/owl-socinfo.c create mode 100644 include/linux/soc/actions/owl-serial-number.h diff --git a/drivers/soc/actions/Kconfig b/drivers/soc/actions/Kconfig index 1aca2058a40c..15faade9282d 100644 --- a/drivers/soc/actions/Kconfig +++ b/drivers/soc/actions/Kconfig @@ -14,4 +14,12 @@ config OWL_PM_DOMAINS power-gating on Actions Semiconductor S500, S700 and S900 SoCs. If unsure, say 'n'. +config OWL_SOCINFO + bool "Actions Semi Owl SoC info driver" + default ARCH_ACTIONS + select SOC_BUS + help + Say 'y' here to support the Action Semiconductor Owl socinfo + driver, providing information about the SoC to user space. + endif diff --git a/drivers/soc/actions/Makefile b/drivers/soc/actions/Makefile index 4db9e7b050e5..4b2591d3089f 100644 --- a/drivers/soc/actions/Makefile +++ b/drivers/soc/actions/Makefile @@ -2,3 +2,4 @@ obj-$(CONFIG_OWL_PM_DOMAINS_HELPER) += owl-sps-helper.o obj-$(CONFIG_OWL_PM_DOMAINS) += owl-sps.o +obj-$(CONFIG_OWL_SOCINFO) += owl-socinfo.o diff --git a/drivers/soc/actions/owl-socinfo.c b/drivers/soc/actions/owl-socinfo.c new file mode 100644 index 000000000000..f28eafac3792 --- /dev/null +++ b/drivers/soc/actions/owl-socinfo.c @@ -0,0 +1,152 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Actions Semi Owl SoC information driver + * + * Copyright (c) 2021 Cristian Ciocaltea + */ + +#include +#include +#include +#include +#include +#include +#include + +struct owl_soc_serial_rmem { + u32 low; + u32 high; +}; + +static struct owl_soc_serial_rmem *owl_socinfo_serial; + +u32 owl_get_soc_serial_low(void) +{ + return owl_socinfo_serial ? owl_socinfo_serial->low : 0; +} +EXPORT_SYMBOL_GPL(owl_get_soc_serial_low); + +u32 owl_get_soc_serial_high(void) +{ + return owl_socinfo_serial ? owl_socinfo_serial->high : 0; +} +EXPORT_SYMBOL_GPL(owl_get_soc_serial_high); + +struct owl_soc_info { + char *name; + int (*read_soc_serial)(struct device *dev); +}; + +/* + * Access SoC's serial number stored by the bootloader in DDR memory. + */ +static int owl_socinfo_read_serial_rmem(struct device *dev) +{ + struct reserved_mem *rmem; + struct device_node *np; + int ret = 0; + + np = of_find_compatible_node(NULL, NULL, "actions,owl-soc-serial"); + if (!np) + return -ENXIO; + + rmem = of_reserved_mem_lookup(np); + if (!rmem) { + dev_err(dev, "failed to acquire reserved memory region\n"); + ret = -EINVAL; + goto out_put; + } + + owl_socinfo_serial = memremap(rmem->base, rmem->size, MEMREMAP_WB); + if (!owl_socinfo_serial) + ret = -ENOMEM; + +out_put: + of_node_put(np); + return ret; +} + +static int owl_socinfo_probe(struct platform_device *pdev) +{ + const struct owl_soc_info *soc_info; + struct soc_device_attribute *soc_dev_attr; + struct soc_device *soc_dev; + const char *sn; + int ret; + + soc_info = of_device_get_match_data(&pdev->dev); + if (!soc_info) + return -ENODEV; + + soc_dev_attr = devm_kzalloc(&pdev->dev, sizeof(*soc_dev_attr), + GFP_KERNEL); + if (!soc_dev_attr) + return -ENOMEM; + + ret = of_property_read_string(of_root, "model", &soc_dev_attr->machine); + if (ret) + return ret; + + soc_dev_attr->family = "Actions Semi Owl"; + soc_dev_attr->soc_id = soc_info->name; + + if (soc_info->read_soc_serial) { + ret = soc_info->read_soc_serial(&pdev->dev); + + if (!ret) { + sn = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%08x%08x", + owl_get_soc_serial_high(), + owl_get_soc_serial_low()); + soc_dev_attr->serial_number = sn; + /* Feed the SoC unique data into entropy pool. */ + add_device_randomness(sn, 16); + } + } + + soc_dev = soc_device_register(soc_dev_attr); + if (IS_ERR(soc_dev)) + return dev_err_probe(&pdev->dev, PTR_ERR(soc_dev), + "failed to register soc device"); + + dev_info(soc_device_to_device(soc_dev), + "SoC: %s %s\n", + soc_dev_attr->family, soc_dev_attr->soc_id); + + return 0; +} + +static const struct owl_soc_info s500_soc_info = { + .name = "S500", + .read_soc_serial = owl_socinfo_read_serial_rmem, +}; + +static const struct owl_soc_info s700_soc_info = { + .name = "S700", + /* FIXME: provide read_soc_serial */ +}; + +static const struct owl_soc_info s900_soc_info = { + .name = "S900", + /* FIXME: provide read_soc_serial */ +}; + +static const struct of_device_id owl_socinfo_of_match[] = { + { .compatible = "actions,s500-soc", .data = &s500_soc_info, }, + { .compatible = "actions,s700-soc", .data = &s700_soc_info, }, + { .compatible = "actions,s900-soc", .data = &s900_soc_info, }, + { } +}; + +static struct platform_driver owl_socinfo_platform_driver = { + .probe = owl_socinfo_probe, + .driver = { + .name = "owl-socinfo", + .of_match_table = owl_socinfo_of_match, + }, +}; + +static int __init owl_socinfo_init(void) +{ + return platform_driver_register(&owl_socinfo_platform_driver); +} +subsys_initcall(owl_socinfo_init); diff --git a/include/linux/soc/actions/owl-serial-number.h b/include/linux/soc/actions/owl-serial-number.h new file mode 100644 index 000000000000..f8595417668f --- /dev/null +++ b/include/linux/soc/actions/owl-serial-number.h @@ -0,0 +1,20 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Copyright (c) 2021 Cristian Ciocaltea + */ + +#ifndef __SOC_ACTIONS_OWL_SERIAL_NUMBER_H__ +#define __SOC_ACTIONS_OWL_SERIAL_NUMBER_H__ + +#if IS_ENABLED(CONFIG_OWL_SOCINFO) +u32 owl_get_soc_serial_low(void); +u32 owl_get_soc_serial_high(void); +#else +static inline u32 owl_get_soc_serial_low(void) +{ return 0; } + +static inline u32 owl_get_soc_serial_high(void) +{ return 0; } +#endif /* CONFIG_OWL_SOCINFO */ + +#endif /* __SOC_ACTIONS_OWL_SERIAL_NUMBER_H__ */