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=-13.7 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_SIGNED,DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,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 106FDC433DB for ; Tue, 30 Mar 2021 13:53:22 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 9EC7761994 for ; Tue, 30 Mar 2021 13:53:21 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9EC7761994 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:Cc:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=0jb7ekcyfzsvWUVDajh5lw5Wxh0mRvo33nlnA14SyQw=; b=bjp/A+dLnxh60ZodbKXv4Bygm yXJRGRheYy21gnIbn8eorEJYUwUTOYG1D1CEZs6XaL82NXrIsRzlokTWHbCxlX/Iqq/yuf9gNySrd A9n8KViVEmV/5jh5Oe36h/NHKw5DdE84iFw+v0ezVbMSqiHlQX/RvZZFT+FzeF/zi/g0LnUhvvXWn vbvYWcSrrgALr1XFWj17E2f/PtC8sbwhewT5dpmJvjDu27m3uPhocS931UHSjVs1G1hv/wJuksMcd wZZ8fndSuNPHp6qiYxbAeVj21JlxRdcdot5jW9KXXeeQFUci2mEoh16Hh+Fb4B5pXSXetV81cTwLR 9+Ah23jVA==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lREmm-003s25-F1; Tue, 30 Mar 2021 13:52:00 +0000 Received: from mail-ej1-x633.google.com ([2a00:1450:4864:20::633]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lREjM-003rcY-Ea; Tue, 30 Mar 2021 13:51:54 +0000 Received: by mail-ej1-x633.google.com with SMTP id r12so24940087ejr.5; Tue, 30 Mar 2021 06:48:28 -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=MEYwDEVEiyA0bEt9FV5PCsetz4kko+HBE27ve6raTzQQSrzJskL9p5ofxg0zUzw3lD zN+2nOmWowqjFDLjKjXPkrisvXC+mVmVy0i+yWZ0qUClAq4GXPuUw6erRfq6n1lsIxsD i4+pc96lH0BqkExXYQWpIzslusY3YAa4CCyVOKoLoakBlzc8sdFk/5yA3V/sPpbC4tKS X0ogMVM3+IUqFIFj41URpjdh2N+cT4nSxZRsRYfAsJcpL4ayDON67PktMyzTPiQ3g7Lj Suupc8u5wG48jHIiRx2AmNgpkyw31Kl9T1fuhyIUbTf91eH3fFyqu7MfMVg3wa+7tgpB adzA== X-Gm-Message-State: AOAM5314VWZZiMK3Xg2tcytSRYK2AsXeod1EO0gJ0PIjWIvoGB8sik1o lO4+qgM9S5iG9R0RPHi8BgY= 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=20F=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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210330_145028_681091_2F8CE66F X-CRM114-Status: GOOD ( 23.61 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.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__ */ -- 2.31.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel