From patchwork Sat Oct 3 20:35:18 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Thompson X-Patchwork-Id: 7322511 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id C460C9F444 for ; Sat, 3 Oct 2015 20:38:34 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id B03AB20769 for ; Sat, 3 Oct 2015 20:38:33 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 204C620795 for ; Sat, 3 Oct 2015 20:38:32 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZiTXV-0005Qt-LL; Sat, 03 Oct 2015 20:36:17 +0000 Received: from mail-wi0-f177.google.com ([209.85.212.177]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZiTXG-0005Je-IH for linux-arm-kernel@lists.infradead.org; Sat, 03 Oct 2015 20:36:03 +0000 Received: by wiclk2 with SMTP id lk2so73222947wic.0 for ; Sat, 03 Oct 2015 13:35:41 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=x2vwa9BAaJNfAQjOzZ9PtFB1dxxI1PCrL2NFai9Hi4Y=; b=jhagZdqDT7uZ03tvTdCjlQBCyZTsM9YszTSCmEEb3Gyr37uCQgCnQV5JnDkM5ZU+lA jBmC/m3VC1ZeKqJBHaku/jjWIEo1Ukq9otnw5bzgHCSqPv8xR7fp6tjX5p84aX65my18 MaB6lz8qB9z3jrKNhp4izGKpAIfka6i2e3829gfryOhBYOCC6UKRn4tBG2uoVS9sOfrY +VG3ztF0+Ik7YDIiSvyimjSVmnoIQOHz4q/ob86nWsRx9U/tUNfp5J11crfOyMIl6tHU +FuTHZyhZWuF6YTDyBL/sWeQiXJuMxUpnibXosFStchIxmcOGEZeHNDqZ4pnCM2uR4ti Zr5w== X-Gm-Message-State: ALoCoQkMN4jqtd80V2lqGXRPO/O6mQDaLK6Ew+B3ksUwPimLwHPSdmmD1TyJQNQcR6Tqgj64Ok/U X-Received: by 10.180.93.168 with SMTP id cv8mr4066359wib.54.1443904540929; Sat, 03 Oct 2015 13:35:40 -0700 (PDT) Received: from wychelm.lan (cpc4-aztw19-0-0-cust71.18-1.cable.virginm.net. [82.33.25.72]) by smtp.gmail.com with ESMTPSA id cc8sm4642418wjc.46.2015.10.03.13.35.39 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 03 Oct 2015 13:35:40 -0700 (PDT) From: Daniel Thompson To: Matt Mackall , Herbert Xu Subject: [PATCH 2/3] hwrng: stm32 - add support for STM32 HW RNG Date: Sat, 3 Oct 2015 21:35:18 +0100 Message-Id: <1443904519-24012-3-git-send-email-daniel.thompson@linaro.org> X-Mailer: git-send-email 2.4.3 In-Reply-To: <1443904519-24012-1-git-send-email-daniel.thompson@linaro.org> References: <1443904519-24012-1-git-send-email-daniel.thompson@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20151003_133602_904389_5768461F X-CRM114-Status: GOOD ( 25.81 ) X-Spam-Score: -2.6 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , devicetree@vger.kernel.org, Daniel Thompson , linaro-kernel@lists.linaro.org, Pawel Moll , patches@linaro.org, Ian Campbell , linux-kernel@vger.kernel.org, Rob Herring , linux-crypto@vger.kernel.org, Maxime Coquelin , Kumar Gala , linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Add support for STMicroelectronics STM32 random number generator. The config value defaults to N, reflecting the fact that STM32 is a very low resource microcontroller platform and unlikely to be targeted by any "grown up" defconfigs. Signed-off-by: Daniel Thompson --- drivers/char/hw_random/Kconfig | 12 +++ drivers/char/hw_random/Makefile | 1 + drivers/char/hw_random/stm32-rng.c | 192 +++++++++++++++++++++++++++++++++++++ 3 files changed, 205 insertions(+) create mode 100644 drivers/char/hw_random/stm32-rng.c diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig index f48cf11c655e..7930cc9b719c 100644 --- a/drivers/char/hw_random/Kconfig +++ b/drivers/char/hw_random/Kconfig @@ -359,6 +359,18 @@ config HW_RANDOM_XGENE If unsure, say Y. +config HW_RANDOM_STM32 + tristate "STMicroelectronics STM32 random number generator" + depends on HW_RANDOM && (ARCH_STM32 || COMPILE_TEST) + help + This driver provides kernel-side support for the Random Number + Generator hardware found on STM32 microcontrollers. + + To compile this driver as a module, choose M here: the + module will be called stm32-rng. + + If unsure, say N. + endif # HW_RANDOM config UML_RANDOM diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile index 055bb01510ad..8b49c0f7abb1 100644 --- a/drivers/char/hw_random/Makefile +++ b/drivers/char/hw_random/Makefile @@ -31,3 +31,4 @@ obj-$(CONFIG_HW_RANDOM_BCM2835) += bcm2835-rng.o obj-$(CONFIG_HW_RANDOM_IPROC_RNG200) += iproc-rng200.o obj-$(CONFIG_HW_RANDOM_MSM) += msm-rng.o obj-$(CONFIG_HW_RANDOM_XGENE) += xgene-rng.o +obj-$(CONFIG_HW_RANDOM_STM32) += stm32-rng.o diff --git a/drivers/char/hw_random/stm32-rng.c b/drivers/char/hw_random/stm32-rng.c new file mode 100644 index 000000000000..37dfa5fca105 --- /dev/null +++ b/drivers/char/hw_random/stm32-rng.c @@ -0,0 +1,192 @@ +/* + * Copyright (c) 2015, Daniel Thompson + * + * This file is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This file is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define RNG_CR 0x00 +#define RNG_CR_RNGEN BIT(2) + +#define RNG_SR 0x04 +#define RNG_SR_SEIS BIT(6) +#define RNG_SR_CEIS BIT(5) +#define RNG_SR_DRDY BIT(0) + +#define RNG_DR 0x08 + +/* + * It takes 40 cycles @ 48MHz to generate each random number (e.g. <1us). + * At the time of writing STM32 parts max out at ~200MHz meaning a timeout + * of 500 leaves us a very comfortable margin for error. The loop to which + * the timeout applies takes at least 4 instructions per cycle so the + * timeout is enough to take us up to multi-GHz parts! + */ +#define RNG_TIMEOUT 500 + +struct stm32_rng_private { + struct hwrng rng; + void __iomem *base; + struct clk *clk; +}; + +static int stm32_rng_read(struct hwrng *rng, void *data, size_t max, bool wait) +{ + struct stm32_rng_private *priv = + container_of(rng, struct stm32_rng_private, rng); + u32 cr, sr; + int retval = 0; + + /* enable random number generation */ + clk_enable(priv->clk); + cr = readl(priv->base + RNG_CR); + writel(cr | RNG_CR_RNGEN, priv->base + RNG_CR); + + while (max > sizeof(u32)) { + sr = readl(priv->base + RNG_SR); + if (!sr && wait) { + unsigned int timeout = RNG_TIMEOUT; + + do { + cpu_relax(); + sr = readl(priv->base + RNG_SR); + } while (!sr && --timeout); + } + + /* Has h/ware error dection been triggered? */ + if (WARN_ON(sr & (RNG_SR_SEIS | RNG_SR_CEIS))) + break; + + /* No data ready... */ + if (!sr) + break; + + *(u32 *)data = readl(priv->base + RNG_DR); + + retval += sizeof(u32); + data += sizeof(u32); + max -= sizeof(u32); + } + + /* disable the generator */ + writel(cr, priv->base + RNG_CR); + clk_disable(priv->clk); + + return retval || !wait ? retval : -EIO; +} + +static int stm32_rng_init(struct hwrng *rng) +{ + struct stm32_rng_private *priv = + container_of(rng, struct stm32_rng_private, rng); + int err; + u32 sr; + + err = clk_prepare(priv->clk); + if (err) + return err; + + /* clear error indicators */ + sr = readl(priv->base + RNG_SR); + sr &= ~(RNG_SR_SEIS | RNG_SR_CEIS); + writel(sr, priv->base + RNG_SR); + + return 0; +} + +static void stm32_rng_cleanup(struct hwrng *rng) +{ + struct stm32_rng_private *priv = + container_of(rng, struct stm32_rng_private, rng); + + clk_unprepare(priv->clk); +} + +static int stm32_rng_remove(struct platform_device *ofdev) +{ + struct device *dev = &ofdev->dev; + struct stm32_rng_private *priv = dev_get_drvdata(dev); + + hwrng_unregister(&priv->rng); + + return 0; +} + +static int stm32_rng_probe(struct platform_device *ofdev) +{ + struct device *dev = &ofdev->dev; + struct device_node *np = ofdev->dev.of_node; + struct stm32_rng_private *priv; + struct resource res; + int err; + + priv = devm_kzalloc(dev, sizeof(struct stm32_rng_private), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + err = of_address_to_resource(np, 0, &res); + if (err) + return err; + + priv->base = devm_ioremap_resource(dev, &res); + if (IS_ERR(priv->base)) + return PTR_ERR(priv->base); + + priv->clk = devm_clk_get(&ofdev->dev, NULL); + if (IS_ERR(priv->clk)) + return PTR_ERR(priv->clk); + + dev_set_drvdata(dev, priv); + + priv->rng.name = dev_driver_string(dev), + priv->rng.init = stm32_rng_init, + priv->rng.cleanup = stm32_rng_cleanup, + priv->rng.read = stm32_rng_read, + priv->rng.priv = (unsigned long) dev; + + err = hwrng_register(&priv->rng); + if (err) + return err; + + return 0; +} + +static const struct of_device_id stm32_rng_match[] = { + { + .compatible = "st,stm32-rng", + }, + {}, +}; +MODULE_DEVICE_TABLE(of, stm32_rng_match); + +static struct platform_driver stm32_rng_driver = { + .driver = { + .name = "stm32_rng", + .of_match_table = stm32_rng_match, + }, + .probe = stm32_rng_probe, + .remove = stm32_rng_remove, +}; + +module_platform_driver(stm32_rng_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Daniel Thompson "); +MODULE_DESCRIPTION("STMicroelectronics STM32 RNG device driver");