117513547SCorentin Labbe #include "sun4i-ss.h" 217513547SCorentin Labbe 317513547SCorentin Labbe int sun4i_ss_prng_seed(struct crypto_rng *tfm, const u8 *seed, 417513547SCorentin Labbe unsigned int slen) 517513547SCorentin Labbe { 617513547SCorentin Labbe struct sun4i_ss_alg_template *algt; 717513547SCorentin Labbe struct rng_alg *alg = crypto_rng_alg(tfm); 817513547SCorentin Labbe 917513547SCorentin Labbe algt = container_of(alg, struct sun4i_ss_alg_template, alg.rng); 1017513547SCorentin Labbe memcpy(algt->ss->seed, seed, slen); 1117513547SCorentin Labbe 1217513547SCorentin Labbe return 0; 1317513547SCorentin Labbe } 1417513547SCorentin Labbe 1517513547SCorentin Labbe int sun4i_ss_prng_generate(struct crypto_rng *tfm, const u8 *src, 1617513547SCorentin Labbe unsigned int slen, u8 *dst, unsigned int dlen) 1717513547SCorentin Labbe { 1817513547SCorentin Labbe struct sun4i_ss_alg_template *algt; 1917513547SCorentin Labbe struct rng_alg *alg = crypto_rng_alg(tfm); 2017513547SCorentin Labbe int i, err; 2117513547SCorentin Labbe u32 v; 2217513547SCorentin Labbe u32 *data = (u32 *)dst; 2317513547SCorentin Labbe const u32 mode = SS_OP_PRNG | SS_PRNG_CONTINUE | SS_ENABLED; 2417513547SCorentin Labbe size_t len; 2517513547SCorentin Labbe struct sun4i_ss_ctx *ss; 2617513547SCorentin Labbe unsigned int todo = (dlen / 4) * 4; 2717513547SCorentin Labbe 2817513547SCorentin Labbe algt = container_of(alg, struct sun4i_ss_alg_template, alg.rng); 2917513547SCorentin Labbe ss = algt->ss; 3017513547SCorentin Labbe 3117513547SCorentin Labbe err = pm_runtime_get_sync(ss->dev); 3217513547SCorentin Labbe if (err < 0) 3317513547SCorentin Labbe return err; 3417513547SCorentin Labbe 35*b1f578b8SCorentin Labbe if (IS_ENABLED(CONFIG_CRYPTO_DEV_SUN4I_SS_DEBUG)) { 36*b1f578b8SCorentin Labbe algt->stat_req++; 37*b1f578b8SCorentin Labbe algt->stat_bytes += todo; 38*b1f578b8SCorentin Labbe } 39*b1f578b8SCorentin Labbe 4017513547SCorentin Labbe spin_lock_bh(&ss->slock); 4117513547SCorentin Labbe 4217513547SCorentin Labbe writel(mode, ss->base + SS_CTL); 4317513547SCorentin Labbe 4417513547SCorentin Labbe while (todo > 0) { 4517513547SCorentin Labbe /* write the seed */ 4617513547SCorentin Labbe for (i = 0; i < SS_SEED_LEN / BITS_PER_LONG; i++) 4717513547SCorentin Labbe writel(ss->seed[i], ss->base + SS_KEY0 + i * 4); 4817513547SCorentin Labbe 4917513547SCorentin Labbe /* Read the random data */ 5017513547SCorentin Labbe len = min_t(size_t, SS_DATA_LEN / BITS_PER_BYTE, todo); 5117513547SCorentin Labbe readsl(ss->base + SS_TXFIFO, data, len / 4); 5217513547SCorentin Labbe data += len / 4; 5317513547SCorentin Labbe todo -= len; 5417513547SCorentin Labbe 5517513547SCorentin Labbe /* Update the seed */ 5617513547SCorentin Labbe for (i = 0; i < SS_SEED_LEN / BITS_PER_LONG; i++) { 5717513547SCorentin Labbe v = readl(ss->base + SS_KEY0 + i * 4); 5817513547SCorentin Labbe ss->seed[i] = v; 5917513547SCorentin Labbe } 6017513547SCorentin Labbe } 6117513547SCorentin Labbe 6217513547SCorentin Labbe writel(0, ss->base + SS_CTL); 6317513547SCorentin Labbe spin_unlock_bh(&ss->slock); 6417513547SCorentin Labbe 6517513547SCorentin Labbe pm_runtime_put(ss->dev); 6617513547SCorentin Labbe 6717513547SCorentin Labbe return 0; 6817513547SCorentin Labbe } 69