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}
70