rockchip: add driver for hardware RNG

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.

Newer Rockchip SoCs like the RK3568 have an independent True Random
Number Generator device. Import pending patchset which adds a driver for
it, include it in Kconfig and enable it in the device tree.

Doing so significantly reduces the time needed to boot devices based on
those SoCs, from about 27 seconds until Ethernet is up and running to
less than 13 seconds with a minimal snapshot image.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

3 files changed, 397 insertions, 0 deletions

diff --git a/target/linux/rockchip/armv8/config-6.1 b/target/linux/rockchip/armv8/config-6.1
index 1830a89c93..a1f79510d7 100644
--- a/target/linux/rockchip/armv8/config-6.1
+++ b/target/linux/rockchip/armv8/config-6.1
@@ -295,6 +295,8 @@ CONFIG_HUGETLB_PAGE=y
 CONFIG_HWMON=y
 CONFIG_HWSPINLOCK=y
 CONFIG_HW_CONSOLE=y
+CONFIG_HW_RANDOM=y
+CONFIG_HW_RANDOM_ROCKCHIP=y
 CONFIG_I2C=y
 CONFIG_I2C_BOARDINFO=y
 CONFIG_I2C_CHARDEV=y
diff --git a/target/linux/rockchip/patches-6.1/300-hwrng-add-Rockchip-SoC-hwrng-driver.patch b/target/linux/rockchip/patches-6.1/300-hwrng-add-Rockchip-SoC-hwrng-driver.patch
new file mode 100644
index 0000000000..6a2d35889b
--- /dev/null
+++ b/target/linux/rockchip/patches-6.1/300-hwrng-add-Rockchip-SoC-hwrng-driver.patch
@@ -0,0 +1,339 @@
+From patchwork Sat Nov 12 14:10:58 2022
+Content-Type: text/plain; charset="utf-8"
+MIME-Version: 1.0
+Content-Transfer-Encoding: 7bit
+X-Patchwork-Submitter: Aurelien Jarno <aurelien@aurel32.net>
+X-Patchwork-Id: 13041222
+Return-Path: 
+ <linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org>
+X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on
+	aws-us-west-2-korg-lkml-1.web.codeaurora.org
+From: Aurelien Jarno <aurelien@aurel32.net>
+To: Olivia Mackall <olivia@selenic.com>,
+	Herbert Xu <herbert@gondor.apana.org.au>,
+	Rob Herring <robh+dt@kernel.org>,
+	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
+	Heiko Stuebner <heiko@sntech.de>,
+	Philipp Zabel <p.zabel@pengutronix.de>,
+	Lin Jinhan <troy.lin@rock-chips.com>
+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 <aurelien@aurel32.net>
+Subject: [PATCH v1 2/3] hwrng: add Rockchip SoC hwrng driver
+Date: Sat, 12 Nov 2022 15:10:58 +0100
+Message-Id: <20221112141059.3802506-3-aurelien@aurel32.net>
+In-Reply-To: <20221112141059.3802506-1-aurelien@aurel32.net>
+References: <20221112141059.3802506-1-aurelien@aurel32.net>
+MIME-Version: 1.0
+List-Id: <linux-arm-kernel.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 <aurelien@aurel32.net>
+---
+ drivers/char/hw_random/Kconfig        |  14 ++
+ drivers/char/hw_random/Makefile       |   1 +
+ drivers/char/hw_random/rockchip-rng.c | 251 ++++++++++++++++++++++++++
+ 3 files changed, 266 insertions(+)
+ create mode 100644 drivers/char/hw_random/rockchip-rng.c
+
+--- 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
+--- a/drivers/char/hw_random/Makefile
++++ b/drivers/char/hw_random/Makefile
+@@ -47,3 +47,4 @@ obj-$(CONFIG_HW_RANDOM_XIPHERA) += xiphe
+ obj-$(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
+--- /dev/null
++++ b/drivers/char/hw_random/rockchip-rng.c
+@@ -0,0 +1,251 @@
++// 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 <troy.lin@rock-chips.com>
++ *  Aurelien Jarno <aurelien@aurel32.net>
++ */
++#include <linux/clk.h>
++#include <linux/hw_random.h>
++#include <linux/io.h>
++#include <linux/iopoll.h>
++#include <linux/kernel.h>
++#include <linux/module.h>
++#include <linux/of_platform.h>
++#include <linux/pm_runtime.h>
++#include <linux/reset.h>
++#include <linux/slab.h>
++
++#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 big endian in the registers */
++	ret = min_t(size_t, max, RK_RNG_MAX_BYTE);
++	for (i = 0; i < ret; i += 4) {
++		reg = readl_relaxed(rk_rng->base + TRNG_RNG_DOUT_0 + i);
++		*(u32 *)(buf + i) = be32_to_cpu(reg);
++	}
++
++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 <troy.lin@rock-chips.com>, Aurelien Jarno <aurelien@aurel32.net>");
++MODULE_LICENSE("GPL v2");
diff --git a/target/linux/rockchip/patches-6.1/301-arm64-dts-rockchip-add-DT-entry-for-RNG-to-RK356x.patch b/target/linux/rockchip/patches-6.1/301-arm64-dts-rockchip-add-DT-entry-for-RNG-to-RK356x.patch
new file mode 100644
index 0000000000..bb34ba76e0
--- /dev/null
+++ b/target/linux/rockchip/patches-6.1/301-arm64-dts-rockchip-add-DT-entry-for-RNG-to-RK356x.patch
@@ -0,0 +1,56 @@
+From patchwork Sat Nov 12 14:10:59 2022
+Content-Type: text/plain; charset="utf-8"
+MIME-Version: 1.0
+Content-Transfer-Encoding: 7bit
+X-Patchwork-Submitter: Aurelien Jarno <aurelien@aurel32.net>
+X-Patchwork-Id: 13041221
+From: Aurelien Jarno <aurelien@aurel32.net>
+To: Olivia Mackall <olivia@selenic.com>,
+	Herbert Xu <herbert@gondor.apana.org.au>,
+	Rob Herring <robh+dt@kernel.org>,
+	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
+	Heiko Stuebner <heiko@sntech.de>,
+	Philipp Zabel <p.zabel@pengutronix.de>,
+	Lin Jinhan <troy.lin@rock-chips.com>
+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 <aurelien@aurel32.net>
+Subject: [PATCH v1 3/3] arm64: dts: rockchip: add DT entry for RNG to RK356x
+Date: Sat, 12 Nov 2022 15:10:59 +0100
+Message-Id: <20221112141059.3802506-4-aurelien@aurel32.net>
+In-Reply-To: <20221112141059.3802506-1-aurelien@aurel32.net>
+References: <20221112141059.3802506-1-aurelien@aurel32.net>
+MIME-Version: 1.0
+List-Id: <linux-arm-kernel.lists.infradead.org>
+
+Enable the just added Rockchip RNG driver for RK356x SoCs.
+
+Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
+---
+ arch/arm64/boot/dts/rockchip/rk356x.dtsi | 9 +++++++++
+ 1 file changed, 9 insertions(+)
+
+--- a/arch/arm64/boot/dts/rockchip/rk356x.dtsi
++++ b/arch/arm64/boot/dts/rockchip/rk356x.dtsi
+@@ -1773,6 +1773,15 @@
+ 		};
+ 	};
+ 
++	rng: rng@fe388000 {
++		compatible = "rockchip,rk3568-rng";
++		reg = <0x0 0xfe388000 0x0 0x4000>;
++		clocks = <&cru CLK_TRNG_NS>, <&cru HCLK_TRNG_NS>;
++		clock-names = "trng_clk", "trng_hclk";
++		resets = <&cru SRST_TRNG_NS>;
++		reset-names = "reset";
++	};
++
+ 	pinctrl: pinctrl {
+ 		compatible = "rockchip,rk3568-pinctrl";
+ 		rockchip,grf = <&grf>;