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61 lines
1.2 KiB
61 lines
1.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* sl3516-ce-rng.c - hardware cryptographic offloader for SL3516 SoC. |
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* |
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* Copyright (C) 2021 Corentin Labbe <[email protected]> |
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* |
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* This file handle the RNG found in the SL3516 crypto engine |
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*/ |
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#include "sl3516-ce.h" |
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#include <linux/pm_runtime.h> |
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#include <linux/hw_random.h> |
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static int sl3516_ce_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait) |
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{ |
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struct sl3516_ce_dev *ce; |
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u32 *data = buf; |
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size_t read = 0; |
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int err; |
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ce = container_of(rng, struct sl3516_ce_dev, trng); |
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#ifdef CONFIG_CRYPTO_DEV_SL3516_DEBUG |
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ce->hwrng_stat_req++; |
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ce->hwrng_stat_bytes += max; |
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#endif |
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err = pm_runtime_get_sync(ce->dev); |
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if (err < 0) { |
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pm_runtime_put_noidle(ce->dev); |
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return err; |
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} |
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while (read < max) { |
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*data = readl(ce->base + IPSEC_RAND_NUM_REG); |
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data++; |
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read += 4; |
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} |
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pm_runtime_put(ce->dev); |
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return read; |
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} |
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int sl3516_ce_rng_register(struct sl3516_ce_dev *ce) |
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{ |
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int ret; |
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ce->trng.name = "SL3516 Crypto Engine RNG"; |
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ce->trng.read = sl3516_ce_rng_read; |
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ce->trng.quality = 700; |
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ret = hwrng_register(&ce->trng); |
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if (ret) |
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dev_err(ce->dev, "Fail to register the RNG\n"); |
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return ret; |
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} |
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void sl3516_ce_rng_unregister(struct sl3516_ce_dev *ce) |
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{ |
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hwrng_unregister(&ce->trng); |
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}
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