linux/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-trng.c

// SPDX-License-Identifier: GPL-2.0
/*
 * sun8i-ce-trng.c - hardware cryptographic offloader for
 * Allwinner H3/A64/H5/H2+/H6/R40 SoC
 *
 * Copyright (C) 2015-2020 Corentin Labbe <[email protected]>
 *
 * This file handle the TRNG
 *
 * You could find a link for the datasheet in Documentation/arch/arm/sunxi.rst
 */
#include "sun8i-ce.h"
#include <linux/dma-mapping.h>
#include <linux/pm_runtime.h>
#include <linux/hw_random.h>
/*
 * Note that according to the algorithm ID, 2 versions of the TRNG exists,
 * The first present in H3/H5/R40/A64 and the second present in H6.
 * This file adds support for both, but only the second is working
 * reliabily according to rngtest.
 **/

static int sun8i_ce_trng_read(struct hwrng *rng, void *data, size_t max, bool wait)
{ … }

int sun8i_ce_hwrng_register(struct sun8i_ce_dev *ce)
{ … }

void sun8i_ce_hwrng_unregister(struct sun8i_ce_dev *ce)
{ … }