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1// SPDX-License-Identifier: GPL-2.0-or-later2#include "sun4i-ss.h"3 4int sun4i_ss_prng_seed(struct crypto_rng *tfm, const u8 *seed,5 unsigned int slen)6{7 struct sun4i_ss_alg_template *algt;8 struct rng_alg *alg = crypto_rng_alg(tfm);9 10 algt = container_of(alg, struct sun4i_ss_alg_template, alg.rng);11 memcpy(algt->ss->seed, seed, slen);12 13 return 0;14}15 16int sun4i_ss_prng_generate(struct crypto_rng *tfm, const u8 *src,17 unsigned int slen, u8 *dst, unsigned int dlen)18{19 struct sun4i_ss_alg_template *algt;20 struct rng_alg *alg = crypto_rng_alg(tfm);21 int i, err;22 u32 v;23 u32 *data = (u32 *)dst;24 const u32 mode = SS_OP_PRNG | SS_PRNG_CONTINUE | SS_ENABLED;25 size_t len;26 struct sun4i_ss_ctx *ss;27 unsigned int todo = (dlen / 4) * 4;28 29 algt = container_of(alg, struct sun4i_ss_alg_template, alg.rng);30 ss = algt->ss;31 32 err = pm_runtime_resume_and_get(ss->dev);33 if (err < 0)34 return err;35 36 if (IS_ENABLED(CONFIG_CRYPTO_DEV_SUN4I_SS_DEBUG)) {37 algt->stat_req++;38 algt->stat_bytes += todo;39 }40 41 spin_lock_bh(&ss->slock);42 43 writel(mode, ss->base + SS_CTL);44 45 while (todo > 0) {46 /* write the seed */47 for (i = 0; i < SS_SEED_LEN / BITS_PER_LONG; i++)48 writel(ss->seed[i], ss->base + SS_KEY0 + i * 4);49 50 /* Read the random data */51 len = min_t(size_t, SS_DATA_LEN / BITS_PER_BYTE, todo);52 readsl(ss->base + SS_TXFIFO, data, len / 4);53 data += len / 4;54 todo -= len;55 56 /* Update the seed */57 for (i = 0; i < SS_SEED_LEN / BITS_PER_LONG; i++) {58 v = readl(ss->base + SS_KEY0 + i * 4);59 ss->seed[i] = v;60 }61 }62 63 writel(0, ss->base + SS_CTL);64 spin_unlock_bh(&ss->slock);65 66 pm_runtime_put(ss->dev);67 68 return 0;69}70