1 #include "sun4i-ss.h" 2 3 int sun4i_ss_prng_seed(struct crypto_rng *tfm, const u8 *seed, 4 unsigned int slen) 5 { 6 struct sun4i_ss_alg_template *algt; 7 struct rng_alg *alg = crypto_rng_alg(tfm); 8 9 algt = container_of(alg, struct sun4i_ss_alg_template, alg.rng); 10 memcpy(algt->ss->seed, seed, slen); 11 12 return 0; 13 } 14 15 int sun4i_ss_prng_generate(struct crypto_rng *tfm, const u8 *src, 16 unsigned int slen, u8 *dst, unsigned int dlen) 17 { 18 struct sun4i_ss_alg_template *algt; 19 struct rng_alg *alg = crypto_rng_alg(tfm); 20 int i, err; 21 u32 v; 22 u32 *data = (u32 *)dst; 23 const u32 mode = SS_OP_PRNG | SS_PRNG_CONTINUE | SS_ENABLED; 24 size_t len; 25 struct sun4i_ss_ctx *ss; 26 unsigned int todo = (dlen / 4) * 4; 27 28 algt = container_of(alg, struct sun4i_ss_alg_template, alg.rng); 29 ss = algt->ss; 30 31 err = pm_runtime_get_sync(ss->dev); 32 if (err < 0) 33 return err; 34 35 spin_lock_bh(&ss->slock); 36 37 writel(mode, ss->base + SS_CTL); 38 39 while (todo > 0) { 40 /* write the seed */ 41 for (i = 0; i < SS_SEED_LEN / BITS_PER_LONG; i++) 42 writel(ss->seed[i], ss->base + SS_KEY0 + i * 4); 43 44 /* Read the random data */ 45 len = min_t(size_t, SS_DATA_LEN / BITS_PER_BYTE, todo); 46 readsl(ss->base + SS_TXFIFO, data, len / 4); 47 data += len / 4; 48 todo -= len; 49 50 /* Update the seed */ 51 for (i = 0; i < SS_SEED_LEN / BITS_PER_LONG; i++) { 52 v = readl(ss->base + SS_KEY0 + i * 4); 53 ss->seed[i] = v; 54 } 55 } 56 57 writel(0, ss->base + SS_CTL); 58 spin_unlock_bh(&ss->slock); 59 60 pm_runtime_put(ss->dev); 61 62 return 0; 63 } 64