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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright 2013, Michael Ellerman, IBM Corporation.
*/
#define pr_fmt(fmt) "pseries-rng: " fmt
#include <linux/kernel.h>
#include <linux/of.h>
#include <asm/archrandom.h>
#include <asm/machdep.h>
#include <asm/plpar_wrappers.h>
static int pseries_get_random_long(unsigned long *v)
{
unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
if (plpar_hcall(H_RANDOM, retbuf) == H_SUCCESS) {
*v = retbuf[0];
return 1;
}
return 0;
}
static __init int rng_init(void)
{
struct device_node *dn;
dn = of_find_compatible_node(NULL, NULL, "ibm,random");
if (!dn)
return -ENODEV;
pr_info("Registering arch random hook.\n");
ppc_md.get_random_seed = pseries_get_random_long;
of_node_put(dn);
return 0;
}
machine_subsys_initcall(pseries, rng_init);
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