linux/drivers/char/hw_random/timeriomem-rng.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * drivers/char/hw_random/timeriomem-rng.c
 *
 * Copyright (C) 2009 Alexander Clouter <[email protected]>
 *
 * Derived from drivers/char/hw_random/omap-rng.c
 *   Copyright 2005 (c) MontaVista Software, Inc.
 *   Author: Deepak Saxena <[email protected]>
 *
 * Overview:
 *   This driver is useful for platforms that have an IO range that provides
 *   periodic random data from a single IO memory address.  All the platform
 *   has to do is provide the address and 'wait time' that new data becomes
 *   available.
 *
 * TODO: add support for reading sizes other than 32bits and masking
 */

#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/hrtimer.h>
#include <linux/hw_random.h>
#include <linux/io.h>
#include <linux/ktime.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/timeriomem-rng.h>

struct timeriomem_rng_private { … };

static int timeriomem_rng_read(struct hwrng *hwrng, void *data,
				size_t max, bool wait)
{ … }

static enum hrtimer_restart timeriomem_rng_trigger(struct hrtimer *timer)
{ … }

static int timeriomem_rng_probe(struct platform_device *pdev)
{ … }

static void timeriomem_rng_remove(struct platform_device *pdev)
{ … }

static const struct of_device_id timeriomem_rng_match[] = …;
MODULE_DEVICE_TABLE(of, timeriomem_rng_match);

static struct platform_driver timeriomem_rng_driver = …;

module_platform_driver(…) …;

MODULE_LICENSE(…) …;
MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;