| // 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> | |
| #include "pseries.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; | |
| } | |
| void __init pseries_rng_init(void) | |
| { | |
| struct device_node *dn; | |
| dn = of_find_compatible_node(NULL, NULL, "ibm,random"); | |
| if (!dn) | |
| return; | |
| ppc_md.get_random_seed = pseries_get_random_long; | |
| of_node_put(dn); | |
| } |