From patchwork Mon Nov 28 18:47:17 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aurelien Jarno X-Patchwork-Id: 13057861 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 7085EC433FE for ; Mon, 28 Nov 2022 18:48:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; 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=XKIFjawG6USNBThd+KG0Y3d75B/SFjbQvNTsHCgkO1Q=; b=Gu4LR2S08A5pww ib51GaNjVgwlq5wAYon6cJ04r9Enek/hznGC4+KtTjlsUvJKYb1LZjqhZCR8yoJgdP8TgvY4Mid84 pPbAwpr3fldK9of9vawi9eQIpHox3pTg9VQLeG5pbC9DmRw2C8fB5ZDe2iMkHk5euPXlJZViBqP6p aqLYGWIb8prkIx3SXRbMh5JLsnomOokHmxSzGR9caWNVlHQune6ya06+wC0iw/sCaYsE+fdITOOBT ZwiRco+h3UyLsN30kmmlC4m40I3kzRLRDqiiDlLvHk0xYBUswfv1W02Yu7a2OZoKkDrhRgkiOLiBj ReX3z/Gl74y+4IZb86MQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1ozjAp-003kxm-Ij; Mon, 28 Nov 2022 18:48:11 +0000 Received: from hall.aurel32.net ([2001:bc8:30d7:100::1]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1ozjAT-003kl1-S2; Mon, 28 Nov 2022 18:47:52 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=aurel32.net ; s=202004.hall; h=Content-Transfer-Encoding:MIME-Version:References: In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Content-Type:From:Reply-To: Subject:Content-ID:Content-Description:X-Debbugs-Cc; bh=o+wfmjgwpLygw6FMdf7t1qVwAF7dGrNBrWiv+F+6N3A=; b=thIS/tGDClZYUL+M1ZxA5S/GnG A6SYPdHA9YeztPUS6zQkGFZowo+GaKwuZX50PkJIhFw+ssjFWs1vI9qXDCSwaO6daNNvIz0ZDqbNu jcHitxpH2QF2d6EGOHJ+yys3fHal8E0RMrwEyEskJjuWBml3HISaxMdLEELO3ZyuhFPO/oJidER+a Ri1KgUg7hingJlDo6L4ppAi/fhk7YjozmTeQ1lLNLyKq8+PL2SWtqUQTGk/FnnqN3XsWs2kiYx7ov pROhXt/wQtVyIuPwcEagweiIJzY81navukhC11ykcciX+nwEHwULkHlZHTKK9YFsJDFNw800mRf2z HXvl7TlA==; Received: from [2a01:e34:ec5d:a741:8a4c:7c4e:dc4c:1787] (helo=ohm.rr44.fr) by hall.aurel32.net with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1ozjA2-006BV9-J5; Mon, 28 Nov 2022 19:47:22 +0100 Received: from aurel32 by ohm.rr44.fr with local (Exim 4.96) (envelope-from ) id 1ozjA1-008Elr-23; Mon, 28 Nov 2022 19:47:21 +0100 From: Aurelien Jarno To: Olivia Mackall , Herbert Xu , Rob Herring , Krzysztof Kozlowski , Heiko Stuebner , Philipp Zabel , Lin Jinhan Cc: linux-crypto@vger.kernel.org (open list:HARDWARE RANDOM NUMBER GENERATOR CORE), devicetree@vger.kernel.org (open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS), linux-arm-kernel@lists.infradead.org (moderated list:ARM/Rockchip SoC support), linux-rockchip@lists.infradead.org (open list:ARM/Rockchip SoC support), linux-kernel@vger.kernel.org (open list), Aurelien Jarno Subject: [PATCH v2 2/3] hwrng: add Rockchip SoC hwrng driver Date: Mon, 28 Nov 2022 19:47:17 +0100 Message-Id: <20221128184718.1963353-3-aurelien@aurel32.net> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20221128184718.1963353-1-aurelien@aurel32.net> References: <20221128184718.1963353-1-aurelien@aurel32.net> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221128_104750_478531_55BC4C0D X-CRM114-Status: GOOD ( 30.41 ) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+linux-rockchip=archiver.kernel.org@lists.infradead.org Rockchip SoCs used to have a random number generator as part of their crypto device, and support for it has to be added to the corresponding driver. However newer Rockchip SoCs like the RK356x have an independent True Random Number Generator device. This patch adds a driver for it, greatly inspired from the downstream driver. The TRNG device does not seem to have a signal conditionner and the FIPS 140-2 test returns a lot of failures. They can be reduced by increasing RK_RNG_SAMPLE_CNT, in a tradeoff between quality and speed. This value has been adjusted to get ~90% of successes and the quality value has been set accordingly. Signed-off-by: Aurelien Jarno --- drivers/char/hw_random/Kconfig | 14 ++ drivers/char/hw_random/Makefile | 1 + drivers/char/hw_random/rockchip-rng.c | 250 ++++++++++++++++++++++++++ 3 files changed, 265 insertions(+) create mode 100644 drivers/char/hw_random/rockchip-rng.c diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig index 3da8e85f8aae..8e5c88504f72 100644 --- a/drivers/char/hw_random/Kconfig +++ b/drivers/char/hw_random/Kconfig @@ -549,6 +549,20 @@ config HW_RANDOM_CN10K To compile this driver as a module, choose M here. The module will be called cn10k_rng. If unsure, say Y. +config HW_RANDOM_ROCKCHIP + tristate "Rockchip True Random Number Generator" + depends on HW_RANDOM && (ARCH_ROCKCHIP || COMPILE_TEST) + depends on HAS_IOMEM + default HW_RANDOM + help + This driver provides kernel-side support for the True Random Number + Generator hardware found on some Rockchip SoC like RK3566 or RK3568. + + To compile this driver as a module, choose M here: the + module will be called rockchip-rng. + + If unsure, say Y. + endif # HW_RANDOM config UML_RANDOM diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile index 3e948cf04476..b7e989535fd6 100644 --- a/drivers/char/hw_random/Makefile +++ b/drivers/char/hw_random/Makefile @@ -47,3 +47,4 @@ obj-$(CONFIG_HW_RANDOM_XIPHERA) += xiphera-trng.o obj-$(CONFIG_HW_RANDOM_ARM_SMCCC_TRNG) += arm_smccc_trng.o obj-$(CONFIG_HW_RANDOM_CN10K) += cn10k-rng.o obj-$(CONFIG_HW_RANDOM_POLARFIRE_SOC) += mpfs-rng.o +obj-$(CONFIG_HW_RANDOM_ROCKCHIP) += rockchip-rng.o diff --git a/drivers/char/hw_random/rockchip-rng.c b/drivers/char/hw_random/rockchip-rng.c new file mode 100644 index 000000000000..18cdd91ad8c3 --- /dev/null +++ b/drivers/char/hw_random/rockchip-rng.c @@ -0,0 +1,250 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * rockchip-rng.c True Random Number Generator driver for Rockchip SoCs + * + * Copyright (c) 2018, Fuzhou Rockchip Electronics Co., Ltd. + * Copyright (c) 2022, Aurelien Jarno + * Authors: + * Lin Jinhan + * Aurelien Jarno + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define RK_RNG_AUTOSUSPEND_DELAY 100 +#define RK_RNG_MAX_BYTE 32 +#define RK_RNG_POLL_PERIOD_US 100 +#define RK_RNG_POLL_TIMEOUT_US 10000 + +/* + * TRNG collects osc ring output bit every RK_RNG_SAMPLE_CNT time. The value is + * a tradeoff between speed and quality and has been adjusted to get a quality + * of ~900 (~90% of FIPS 140-2 successes). + */ +#define RK_RNG_SAMPLE_CNT 1000 + +/* TRNG registers from RK3568 TRM-Part2, section 5.4.1 */ +#define TRNG_RST_CTL 0x0004 +#define TRNG_RNG_CTL 0x0400 +#define TRNG_RNG_CTL_LEN_64_BIT (0x00 << 4) +#define TRNG_RNG_CTL_LEN_128_BIT (0x01 << 4) +#define TRNG_RNG_CTL_LEN_192_BIT (0x02 << 4) +#define TRNG_RNG_CTL_LEN_256_BIT (0x03 << 4) +#define TRNG_RNG_CTL_OSC_RING_SPEED_0 (0x00 << 2) +#define TRNG_RNG_CTL_OSC_RING_SPEED_1 (0x01 << 2) +#define TRNG_RNG_CTL_OSC_RING_SPEED_2 (0x02 << 2) +#define TRNG_RNG_CTL_OSC_RING_SPEED_3 (0x03 << 2) +#define TRNG_RNG_CTL_ENABLE BIT(1) +#define TRNG_RNG_CTL_START BIT(0) +#define TRNG_RNG_SAMPLE_CNT 0x0404 +#define TRNG_RNG_DOUT_0 0x0410 +#define TRNG_RNG_DOUT_1 0x0414 +#define TRNG_RNG_DOUT_2 0x0418 +#define TRNG_RNG_DOUT_3 0x041c +#define TRNG_RNG_DOUT_4 0x0420 +#define TRNG_RNG_DOUT_5 0x0424 +#define TRNG_RNG_DOUT_6 0x0428 +#define TRNG_RNG_DOUT_7 0x042c + +struct rk_rng { + struct hwrng rng; + void __iomem *base; + struct reset_control *rst; + int clk_num; + struct clk_bulk_data *clk_bulks; +}; + +/* The mask determine the bits that are updated */ +static void rk_rng_write_ctl(struct rk_rng *rng, u32 val, u32 mask) +{ + writel_relaxed((mask << 16) | val, rng->base + TRNG_RNG_CTL); +} + +static int rk_rng_init(struct hwrng *rng) +{ + struct rk_rng *rk_rng = container_of(rng, struct rk_rng, rng); + u32 reg; + int ret; + + /* start clocks */ + ret = clk_bulk_prepare_enable(rk_rng->clk_num, rk_rng->clk_bulks); + if (ret < 0) { + dev_err((struct device *) rk_rng->rng.priv, + "Failed to enable clks %d\n", ret); + return ret; + } + + /* set the sample period */ + writel(RK_RNG_SAMPLE_CNT, rk_rng->base + TRNG_RNG_SAMPLE_CNT); + + /* set osc ring speed and enable it */ + reg = TRNG_RNG_CTL_LEN_256_BIT | + TRNG_RNG_CTL_OSC_RING_SPEED_0 | + TRNG_RNG_CTL_ENABLE; + rk_rng_write_ctl(rk_rng, reg, 0xffff); + + return 0; +} + +static void rk_rng_cleanup(struct hwrng *rng) +{ + struct rk_rng *rk_rng = container_of(rng, struct rk_rng, rng); + u32 reg; + + /* stop TRNG */ + reg = 0; + rk_rng_write_ctl(rk_rng, reg, 0xffff); + + /* stop clocks */ + clk_bulk_disable_unprepare(rk_rng->clk_num, rk_rng->clk_bulks); +} + +static int rk_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait) +{ + struct rk_rng *rk_rng = container_of(rng, struct rk_rng, rng); + u32 reg; + int ret = 0; + int i; + + pm_runtime_get_sync((struct device *) rk_rng->rng.priv); + + /* Start collecting random data */ + reg = TRNG_RNG_CTL_START; + rk_rng_write_ctl(rk_rng, reg, reg); + + ret = readl_poll_timeout(rk_rng->base + TRNG_RNG_CTL, reg, + !(reg & TRNG_RNG_CTL_START), + RK_RNG_POLL_PERIOD_US, + RK_RNG_POLL_TIMEOUT_US); + if (ret < 0) + goto out; + + /* Read random data stored in the registers */ + ret = min_t(size_t, max, RK_RNG_MAX_BYTE); + for (i = 0; i < ret; i += 4) { + *(u32 *)(buf + i) = readl_relaxed(rk_rng->base + TRNG_RNG_DOUT_0 + i); + } + +out: + pm_runtime_mark_last_busy((struct device *) rk_rng->rng.priv); + pm_runtime_put_sync_autosuspend((struct device *) rk_rng->rng.priv); + + return ret; +} + +static int rk_rng_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct rk_rng *rk_rng; + int ret; + + rk_rng = devm_kzalloc(dev, sizeof(struct rk_rng), GFP_KERNEL); + if (!rk_rng) + return -ENOMEM; + + rk_rng->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(rk_rng->base)) + return PTR_ERR(rk_rng->base); + + rk_rng->clk_num = devm_clk_bulk_get_all(dev, &rk_rng->clk_bulks); + if (rk_rng->clk_num < 0) + return dev_err_probe(dev, rk_rng->clk_num, + "Failed to get clks property\n"); + + rk_rng->rst = devm_reset_control_array_get(&pdev->dev, false, false); + if (IS_ERR(rk_rng->rst)) + return dev_err_probe(dev, PTR_ERR(rk_rng->rst), + "Failed to get reset property\n"); + + reset_control_assert(rk_rng->rst); + udelay(2); + reset_control_deassert(rk_rng->rst); + + platform_set_drvdata(pdev, rk_rng); + + rk_rng->rng.name = dev_driver_string(dev); +#ifndef CONFIG_PM + rk_rng->rng.init = rk_rng_init; + rk_rng->rng.cleanup = rk_rng_cleanup; +#endif + rk_rng->rng.read = rk_rng_read; + rk_rng->rng.priv = (unsigned long) dev; + rk_rng->rng.quality = 900; + + pm_runtime_set_autosuspend_delay(dev, RK_RNG_AUTOSUSPEND_DELAY); + pm_runtime_use_autosuspend(dev); + pm_runtime_enable(dev); + + ret = devm_hwrng_register(dev, &rk_rng->rng); + if (ret) + return dev_err_probe(&pdev->dev, ret, "Failed to register Rockchip hwrng\n"); + + dev_info(&pdev->dev, "Registered Rockchip hwrng\n"); + + return 0; +} + +static int rk_rng_remove(struct platform_device *pdev) +{ + pm_runtime_disable(&pdev->dev); + + return 0; +} + +#ifdef CONFIG_PM +static int rk_rng_runtime_suspend(struct device *dev) +{ + struct rk_rng *rk_rng = dev_get_drvdata(dev); + + rk_rng_cleanup(&rk_rng->rng); + + return 0; +} + +static int rk_rng_runtime_resume(struct device *dev) +{ + struct rk_rng *rk_rng = dev_get_drvdata(dev); + + return rk_rng_init(&rk_rng->rng); +} +#endif + +static const struct dev_pm_ops rk_rng_pm_ops = { + SET_RUNTIME_PM_OPS(rk_rng_runtime_suspend, + rk_rng_runtime_resume, NULL) + SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, + pm_runtime_force_resume) +}; + +static const struct of_device_id rk_rng_dt_match[] = { + { + .compatible = "rockchip,rk3568-rng", + }, + {}, +}; + +MODULE_DEVICE_TABLE(of, rk_rng_dt_match); + +static struct platform_driver rk_rng_driver = { + .driver = { + .name = "rockchip-rng", + .pm = &rk_rng_pm_ops, + .of_match_table = rk_rng_dt_match, + }, + .probe = rk_rng_probe, + .remove = rk_rng_remove, +}; + +module_platform_driver(rk_rng_driver); + +MODULE_DESCRIPTION("Rockchip True Random Number Generator driver"); +MODULE_AUTHOR("Lin Jinhan , Aurelien Jarno "); +MODULE_LICENSE("GPL v2");