// SPDX-License-Identifier: GPL-2.0 /* * rockchip-rng.c True Random Number Generator driver for Rockchip RK3568 SoC * * Copyright (c) 2018, Fuzhou Rockchip Electronics Co., Ltd. * Copyright (c) 2022, Aurelien Jarno * Authors: * Lin Jinhan <[email protected]> * Aurelien Jarno <[email protected]> */ #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.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/reset.h> #include <linux/slab.h> #define RK_RNG_AUTOSUSPEND_DELAY … #define RK_RNG_MAX_BYTE … #define RK_RNG_POLL_PERIOD_US … #define RK_RNG_POLL_TIMEOUT_US … /* * 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 (~87.5% of FIPS 140-2 successes). */ #define RK_RNG_SAMPLE_CNT … /* TRNG registers from RK3568 TRM-Part2, section 5.4.1 */ #define TRNG_RST_CTL … #define TRNG_RNG_CTL … #define TRNG_RNG_CTL_LEN_64_BIT … #define TRNG_RNG_CTL_LEN_128_BIT … #define TRNG_RNG_CTL_LEN_192_BIT … #define TRNG_RNG_CTL_LEN_256_BIT … #define TRNG_RNG_CTL_OSC_RING_SPEED_0 … #define TRNG_RNG_CTL_OSC_RING_SPEED_1 … #define TRNG_RNG_CTL_OSC_RING_SPEED_2 … #define TRNG_RNG_CTL_OSC_RING_SPEED_3 … #define TRNG_RNG_CTL_MASK … #define TRNG_RNG_CTL_ENABLE … #define TRNG_RNG_CTL_START … #define TRNG_RNG_SAMPLE_CNT … #define TRNG_RNG_DOUT … struct rk_rng { … }; /* The mask in the upper 16 bits determines the bits that are updated */ static void rk_rng_write_ctl(struct rk_rng *rng, u32 val, u32 mask) { … } static int rk_rng_init(struct hwrng *rng) { … } static void rk_rng_cleanup(struct hwrng *rng) { … } static int rk_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait) { … } static int rk_rng_probe(struct platform_device *pdev) { … } static int __maybe_unused rk_rng_runtime_suspend(struct device *dev) { … } static int __maybe_unused rk_rng_runtime_resume(struct device *dev) { … } static const struct dev_pm_ops rk_rng_pm_ops = …; static const struct of_device_id rk_rng_dt_match[] = …; MODULE_DEVICE_TABLE(of, rk_rng_dt_match); static struct platform_driver rk_rng_driver = …; module_platform_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …;
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