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