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mediatek: add driver for HW-RNG v2

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Add driver for hardware random number generator found in MT7981, MT7988
and MT7987. This gives us a fast source of high-quality random numbers
on those platforms.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
This commit is contained in:
Daniel Golle 2025-09-11 01:43:24 +01:00
parent a8c92456d0
commit 8c0898a465
5 changed files with 137 additions and 0 deletions
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1
target/linux/mediatek/filogic/config-6.12
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@ -221,6 +221,7 @@ CONFIG_HAS_IOPORT_MAP=y
CONFIG_HWMON=y
CONFIG_HW_RANDOM=y
CONFIG_HW_RANDOM_MTK=y
CONFIG_HW_RANDOM_MTK_V2=y
CONFIG_I2C=y
CONFIG_I2C_BOARDINFO=y
CONFIG_I2C_CHARDEV=y

1
target/linux/mediatek/mt7622/config-6.12
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@ -220,6 +220,7 @@ CONFIG_HAS_IOPORT_MAP=y
CONFIG_HWMON=y
CONFIG_HW_RANDOM=y
CONFIG_HW_RANDOM_MTK=y
# CONFIG_HW_RANDOM_MTK_V2 is not set
CONFIG_I2C=y
CONFIG_I2C_BOARDINFO=y
CONFIG_I2C_CHARDEV=y

1
target/linux/mediatek/mt7623/config-6.12
View File

@ -315,6 +315,7 @@ CONFIG_HOTPLUG_CPU=y
CONFIG_HWMON=y
CONFIG_HW_RANDOM=y
CONFIG_HW_RANDOM_MTK=y
# CONFIG_HW_RANDOM_MTK_V2 is not set
CONFIG_HZ_FIXED=0
CONFIG_I2C=y
CONFIG_I2C_ALGOBIT=y

1
target/linux/mediatek/mt7629/config-6.12
View File

@ -160,6 +160,7 @@ CONFIG_HOTPLUG_CORE_SYNC_DEAD=y
CONFIG_HOTPLUG_CPU=y
CONFIG_HW_RANDOM=y
CONFIG_HW_RANDOM_MTK=y
# CONFIG_HW_RANDOM_MTK_V2 is not set
CONFIG_HZ_FIXED=0
# CONFIG_IDPF is not set
CONFIG_INITRAMFS_SOURCE=""

133
target/linux/mediatek/patches-6.12/320-hwrng-add-driver-for-MediaTek-TRNG-SMC.patch Normal file
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@ -0,0 +1,133 @@
From 9837930d6738e9fdc323ad887ace7c236a61d70c Mon Sep 17 00:00:00 2001
From: Daniel Golle <daniel@makrotopia.org>
Date: Wed, 25 Jan 2023 00:27:49 +0000
Subject: [PATCH] hwrng: add driver for MediaTek TRNG SMC
Add driver providing kernel-side support for the Random Number
Generator hardware found on Mediatek SoCs which have a driver in ARM
TrustedFirmware-A allowing Linux to read random numbers using a
non-standard vendor-defined Secure Monitor Call.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
drivers/char/hw_random/Kconfig | 16 +++++++
drivers/char/hw_random/Makefile | 1 +
drivers/char/hw_random/mtk-rng-v2.c | 74 +++++++++++++++++++++++++++++
3 files changed, 91 insertions(+)
create mode 100644 drivers/char/hw_random/mtk-rng-v2.c
--- a/drivers/char/hw_random/Kconfig
+++ b/drivers/char/hw_random/Kconfig
@@ -451,6 +451,23 @@ config HW_RANDOM_MTK
If unsure, say Y.
+config HW_RANDOM_MTK_V2
+ tristate "Mediatek Random Number Generator support (v2/SMC)"
+ depends on HAVE_ARM_SMCCC
+ depends on HW_RANDOM
+ depends on (ARM64 && ARCH_MEDIATEK) || COMPILE_TEST
+ default y
+ help
+ This driver provides kernel-side support for the Random Number
+ Generator hardware found on Mediatek SoCs which have a driver
+ in ARM TrustedFirmware-A allowing Linux to read using a non-
+ standard vendor-defined Secure Monitor Call.
+
+ To compile this driver as a module, choose M here. the
+ module will be called mtk-rng-v2.
+
+ If unsure, say Y.
+
config HW_RANDOM_S390
tristate "S390 True Random Number Generator support"
depends on S390
--- a/drivers/char/hw_random/Makefile
+++ b/drivers/char/hw_random/Makefile
@@ -39,6 +39,7 @@ obj-$(CONFIG_HW_RANDOM_PIC32) += pic32-r
obj-$(CONFIG_HW_RANDOM_MESON) += meson-rng.o
obj-$(CONFIG_HW_RANDOM_CAVIUM) += cavium-rng.o cavium-rng-vf.o
obj-$(CONFIG_HW_RANDOM_MTK) += mtk-rng.o
+obj-$(CONFIG_HW_RANDOM_MTK_V2) += mtk-rng-v2.o
obj-$(CONFIG_HW_RANDOM_S390) += s390-trng.o
obj-$(CONFIG_HW_RANDOM_KEYSTONE) += ks-sa-rng.o
obj-$(CONFIG_HW_RANDOM_OPTEE) += optee-rng.o
--- /dev/null
+++ b/drivers/char/hw_random/mtk-rng-v2.c
@@ -0,0 +1,76 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Driver for Mediatek Hardware Random Number Generator (v2/SMCC)
+ *
+ * Copyright (C) 2023 Daniel Golle <daniel@makrotopia.org>
+ * based on patch from Mingming Su <Mingming.Su@mediatek.com>
+ */
+#define MTK_RNG_DEV KBUILD_MODNAME
+
+#include <linux/arm-smccc.h>
+#include <linux/err.h>
+#include <linux/hw_random.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/soc/mediatek/mtk_sip_svc.h>
+
+#define MTK_SIP_KERNEL_GET_RND MTK_SIP_SMC_CMD(0x550)
+
+static int mtk_rng_v2_read(struct hwrng *rng, void *buf, size_t max, bool wait)
+{
+ struct arm_smccc_res res;
+ int retval = 0;
+
+ while (max >= sizeof(u32)) {
+ arm_smccc_smc(MTK_SIP_KERNEL_GET_RND, 0, 0, 0, 0, 0, 0, 0,
+ &res);
+ if (res.a0)
+ break;
+
+ *(u32 *)buf = res.a1;
+ retval += sizeof(u32);
+ buf += sizeof(u32);
+ max -= sizeof(u32);
+ }
+
+ return retval || !wait ? retval : -EIO;
+}
+
+static int mtk_rng_v2_probe(struct platform_device *pdev)
+{
+ struct hwrng *trng;
+
+ trng = devm_kzalloc(&pdev->dev, sizeof(*trng), GFP_KERNEL);
+ if (!trng)
+ return -ENOMEM;
+
+ trng->name = pdev->name;
+ trng->read = mtk_rng_v2_read;
+ trng->quality = 900;
+
+ return devm_hwrng_register(&pdev->dev, trng);
+}
+
+static const struct of_device_id mtk_rng_v2_match[] = {
+ { .compatible = "mediatek,mt7981-rng" },
+ { .compatible = "mediatek,mt7987-rng" },
+ { .compatible = "mediatek,mt7988-rng" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, mtk_rng_v2_match);
+
+static struct platform_driver mtk_rng_v2_driver = {
+ .probe = mtk_rng_v2_probe,
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .of_match_table = mtk_rng_v2_match,
+ },
+};
+module_platform_driver(mtk_rng_v2_driver);
+
+MODULE_DESCRIPTION("Mediatek Random Number Generator Driver (v2/SMC)");
+MODULE_AUTHOR("Daniel Golle <daniel@makrotopia.org>");
+MODULE_LICENSE("GPL");