1 // SPDX-License-Identifier: GPL-2.0-or-later
2 #include "sun4i-ss.h"
3
sun4i_ss_prng_seed(struct crypto_rng * tfm,const u8 * seed,unsigned int slen)4 int 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
sun4i_ss_prng_generate(struct crypto_rng * tfm,const u8 * src,unsigned int slen,u8 * dst,unsigned int dlen)16 int 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