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69 lines
1.6 KiB
69 lines
1.6 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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#include "sun4i-ss.h" |
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int sun4i_ss_prng_seed(struct crypto_rng *tfm, const u8 *seed, |
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unsigned int slen) |
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{ |
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struct sun4i_ss_alg_template *algt; |
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struct rng_alg *alg = crypto_rng_alg(tfm); |
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algt = container_of(alg, struct sun4i_ss_alg_template, alg.rng); |
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memcpy(algt->ss->seed, seed, slen); |
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return 0; |
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} |
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int sun4i_ss_prng_generate(struct crypto_rng *tfm, const u8 *src, |
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unsigned int slen, u8 *dst, unsigned int dlen) |
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{ |
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struct sun4i_ss_alg_template *algt; |
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struct rng_alg *alg = crypto_rng_alg(tfm); |
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int i, err; |
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u32 v; |
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u32 *data = (u32 *)dst; |
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const u32 mode = SS_OP_PRNG | SS_PRNG_CONTINUE | SS_ENABLED; |
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size_t len; |
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struct sun4i_ss_ctx *ss; |
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unsigned int todo = (dlen / 4) * 4; |
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algt = container_of(alg, struct sun4i_ss_alg_template, alg.rng); |
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ss = algt->ss; |
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err = pm_runtime_resume_and_get(ss->dev); |
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if (err < 0) |
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return err; |
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if (IS_ENABLED(CONFIG_CRYPTO_DEV_SUN4I_SS_DEBUG)) { |
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algt->stat_req++; |
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algt->stat_bytes += todo; |
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} |
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spin_lock_bh(&ss->slock); |
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writel(mode, ss->base + SS_CTL); |
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while (todo > 0) { |
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/* write the seed */ |
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for (i = 0; i < SS_SEED_LEN / BITS_PER_LONG; i++) |
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writel(ss->seed[i], ss->base + SS_KEY0 + i * 4); |
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/* Read the random data */ |
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len = min_t(size_t, SS_DATA_LEN / BITS_PER_BYTE, todo); |
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readsl(ss->base + SS_TXFIFO, data, len / 4); |
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data += len / 4; |
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todo -= len; |
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/* Update the seed */ |
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for (i = 0; i < SS_SEED_LEN / BITS_PER_LONG; i++) { |
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v = readl(ss->base + SS_KEY0 + i * 4); |
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ss->seed[i] = v; |
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} |
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} |
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writel(0, ss->base + SS_CTL); |
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spin_unlock_bh(&ss->slock); |
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pm_runtime_put(ss->dev); |
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return 0; |
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}
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