// SPDX-License-Identifier: GPL-2.0-only /* * ST Random Number Generator Driver ST's Platforms * * Author: Pankaj Dev: <[email protected]> * Lee Jones <[email protected]> * * Copyright (C) 2015 STMicroelectronics (R&D) Limited */ #include <linux/clk.h> #include <linux/delay.h> #include <linux/hw_random.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/slab.h> /* Registers */ #define ST_RNG_STATUS_REG … #define ST_RNG_DATA_REG … /* Registers fields */ #define ST_RNG_STATUS_BAD_SEQUENCE … #define ST_RNG_STATUS_BAD_ALTERNANCE … #define ST_RNG_STATUS_FIFO_FULL … #define ST_RNG_SAMPLE_SIZE … #define ST_RNG_FIFO_DEPTH … #define ST_RNG_FIFO_SIZE … /* * Samples are documented to be available every 0.667us, so in theory * the 4 sample deep FIFO should take 2.668us to fill. However, during * thorough testing, it became apparent that filling the FIFO actually * takes closer to 12us. We then multiply by 2 in order to account for * the lack of udelay()'s reliability, suggested by Russell King. */ #define ST_RNG_FILL_FIFO_TIMEOUT … struct st_rng_data { … }; static int st_rng_read(struct hwrng *rng, void *data, size_t max, bool wait) { … } static int st_rng_probe(struct platform_device *pdev) { … } static const struct of_device_id st_rng_match[] __maybe_unused = …; MODULE_DEVICE_TABLE(of, st_rng_match); static struct platform_driver st_rng_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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