| // 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); |
| } |
