1 // SPDX-License-Identifier: GPL-2.0
3 * sl3516-ce-rng.c - hardware cryptographic offloader for SL3516 SoC.
5 * Copyright (C) 2021 Corentin Labbe <clabbe@baylibre.com>
7 * This file handle the RNG found in the SL3516 crypto engine
10 #include <linux/pm_runtime.h>
11 #include <linux/hw_random.h>
13 static int sl3516_ce_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
15 struct sl3516_ce_dev *ce;
20 ce = container_of(rng, struct sl3516_ce_dev, trng);
22 #ifdef CONFIG_CRYPTO_DEV_SL3516_DEBUG
24 ce->hwrng_stat_bytes += max;
27 err = pm_runtime_get_sync(ce->dev);
29 pm_runtime_put_noidle(ce->dev);
34 *data = readl(ce->base + IPSEC_RAND_NUM_REG);
39 pm_runtime_put(ce->dev);
44 int sl3516_ce_rng_register(struct sl3516_ce_dev *ce)
48 ce->trng.name = "SL3516 Crypto Engine RNG";
49 ce->trng.read = sl3516_ce_rng_read;
50 ce->trng.quality = 700;
52 ret = hwrng_register(&ce->trng);
54 dev_err(ce->dev, "Fail to register the RNG\n");
58 void sl3516_ce_rng_unregister(struct sl3516_ce_dev *ce)
60 hwrng_unregister(&ce->trng);