1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright 2013, Michael Ellerman, IBM Corporation.
4 */
5
6#define pr_fmt(fmt)	"pseries-rng: " fmt
7
8#include <linux/kernel.h>
9#include <linux/of.h>
10#include <asm/archrandom.h>
11#include <asm/machdep.h>
12#include <asm/plpar_wrappers.h>
13#include "pseries.h"
14
15
16static int pseries_get_random_long(unsigned long *v)
17{
18	unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
19
20	if (plpar_hcall(H_RANDOM, retbuf) == H_SUCCESS) {
21		*v = retbuf[0];
22		return 1;
23	}
24
25	return 0;
26}
27
28void __init pseries_rng_init(void)
29{
30	struct device_node *dn;
31
32	dn = of_find_compatible_node(NULL, NULL, "ibm,random");
33	if (!dn)
34		return;
35	ppc_md.get_random_seed = pseries_get_random_long;
36	of_node_put(dn);
37}
38