1#include "sun4i-ss.h"
2
3int 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
15int 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