// SPDX-License-Identifier: GPL-2.0 /* * RNG driver for Exynos TRNGs * * Author: Łukasz Stelmach <[email protected]> * * Copyright 2017 (c) Samsung Electronics Software, Inc. * * Based on the Exynos PRNG driver drivers/crypto/exynos-rng by * Krzysztof Kozłowski <[email protected]> */ #include <linux/arm-smccc.h> #include <linux/clk.h> #include <linux/crypto.h> #include <linux/delay.h> #include <linux/err.h> #include <linux/hw_random.h> #include <linux/io.h> #include <linux/iopoll.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/mod_devicetable.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/property.h> #define EXYNOS_TRNG_CLKDIV … #define EXYNOS_TRNG_CTRL … #define EXYNOS_TRNG_CTRL_RNGEN … #define EXYNOS_TRNG_POST_CTRL … #define EXYNOS_TRNG_ONLINE_CTRL … #define EXYNOS_TRNG_ONLINE_STAT … #define EXYNOS_TRNG_ONLINE_MAXCHI2 … #define EXYNOS_TRNG_FIFO_CTRL … #define EXYNOS_TRNG_FIFO_0 … #define EXYNOS_TRNG_FIFO_1 … #define EXYNOS_TRNG_FIFO_2 … #define EXYNOS_TRNG_FIFO_3 … #define EXYNOS_TRNG_FIFO_4 … #define EXYNOS_TRNG_FIFO_5 … #define EXYNOS_TRNG_FIFO_6 … #define EXYNOS_TRNG_FIFO_7 … #define EXYNOS_TRNG_FIFO_LEN … #define EXYNOS_TRNG_CLOCK_RATE … /* Driver feature flags */ #define EXYNOS_SMC … #define EXYNOS_SMC_CALL_VAL(func_num) … /* SMC command for DTRNG access */ #define SMC_CMD_RANDOM … /* SMC_CMD_RANDOM: arguments */ #define HWRNG_INIT … #define HWRNG_EXIT … #define HWRNG_GET_DATA … #define HWRNG_RESUME … /* SMC_CMD_RANDOM: return values */ #define HWRNG_RET_OK … #define HWRNG_RET_RETRY_ERROR … #define HWRNG_MAX_TRIES … struct exynos_trng_dev { … }; static int exynos_trng_do_read_reg(struct hwrng *rng, void *data, size_t max, bool wait) { … } static int exynos_trng_do_read_smc(struct hwrng *rng, void *data, size_t max, bool wait) { … } static int exynos_trng_init_reg(struct hwrng *rng) { … } static int exynos_trng_init_smc(struct hwrng *rng) { … } static int exynos_trng_probe(struct platform_device *pdev) { … } static void exynos_trng_remove(struct platform_device *pdev) { … } static int exynos_trng_suspend(struct device *dev) { … } static int exynos_trng_resume(struct device *dev) { … } static DEFINE_SIMPLE_DEV_PM_OPS(exynos_trng_pm_ops, exynos_trng_suspend, exynos_trng_resume); static const struct of_device_id exynos_trng_dt_match[] = …; MODULE_DEVICE_TABLE(of, exynos_trng_dt_match); static struct platform_driver exynos_trng_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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