| /* |
| * Copyright 2013, Michael Ellerman, IBM Corporation. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| #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_long = pseries_get_random_long; |
| |
| return 0; |
| } |
| subsys_initcall(rng_init); |
