sun4i-ss-prng.c (1637B)
1// SPDX-License-Identifier: GPL-2.0-or-later 2#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}