// SPDX-License-Identifier: GPL-2.0-only /* * Random Number Generator driver for the Keystone SOC * * Copyright (C) 2016 Texas Instruments Incorporated - https://www.ti.com * * Authors: Sandeep Nair * Vitaly Andrianov */ #include <linux/hw_random.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/io.h> #include <linux/platform_device.h> #include <linux/clk.h> #include <linux/pm_runtime.h> #include <linux/err.h> #include <linux/regmap.h> #include <linux/mfd/syscon.h> #include <linux/of.h> #include <linux/of_address.h> #include <linux/delay.h> #include <linux/timekeeping.h> #define SA_CMD_STATUS_OFS … /* TRNG enable control in SA System module*/ #define SA_CMD_STATUS_REG_TRNG_ENABLE … /* TRNG start control in TRNG module */ #define TRNG_CNTL_REG_TRNG_ENABLE … /* Data ready indicator in STATUS register */ #define TRNG_STATUS_REG_READY … /* Data ready clear control in INTACK register */ #define TRNG_INTACK_REG_READY … /* * Number of samples taken to gather entropy during startup. * If value is 0, the number of samples is 2^24 else * equals value times 2^8. */ #define TRNG_DEF_STARTUP_CYCLES … #define TRNG_CNTL_REG_STARTUP_CYCLES_SHIFT … /* * Minimum number of samples taken to regenerate entropy * If value is 0, the number of samples is 2^24 else * equals value times 2^6. */ #define TRNG_DEF_MIN_REFILL_CYCLES … #define TRNG_CFG_REG_MIN_REFILL_CYCLES_SHIFT … /* * Maximum number of samples taken to regenerate entropy * If value is 0, the number of samples is 2^24 else * equals value times 2^8. */ #define TRNG_DEF_MAX_REFILL_CYCLES … #define TRNG_CFG_REG_MAX_REFILL_CYCLES_SHIFT … /* Number of CLK input cycles between samples */ #define TRNG_DEF_CLK_DIV_CYCLES … #define TRNG_CFG_REG_SAMPLE_DIV_SHIFT … /* Maximum retries to get rng data */ #define SA_MAX_RNG_DATA_RETRIES … /* Delay between retries (in usecs) */ #define SA_RNG_DATA_RETRY_DELAY … struct trng_regs { … }; struct ks_sa_rng { … }; static unsigned int cycles_to_ns(unsigned long clk_rate, unsigned int cycles) { … } static unsigned int startup_delay_ns(unsigned long clk_rate) { … } static unsigned int refill_delay_ns(unsigned long clk_rate) { … } static int ks_sa_rng_init(struct hwrng *rng) { … } static void ks_sa_rng_cleanup(struct hwrng *rng) { … } static int ks_sa_rng_data_read(struct hwrng *rng, u32 *data) { … } static int ks_sa_rng_data_present(struct hwrng *rng, int wait) { … } static int ks_sa_rng_probe(struct platform_device *pdev) { … } static void ks_sa_rng_remove(struct platform_device *pdev) { … } static const struct of_device_id ks_sa_rng_dt_match[] = …; MODULE_DEVICE_TABLE(of, ks_sa_rng_dt_match); static struct platform_driver ks_sa_rng_driver = …; module_platform_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …;
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