| Michael Ellerman | a489043 | 2013-10-11 14:07:59 +1100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2013, Michael Ellerman, IBM Corporation. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version |
| 7 | * 2 of the License, or (at your option) any later version. |
| 8 | */ |
| 9 | |
| 10 | #define pr_fmt(fmt) "pseries-rng: " fmt |
| 11 | |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/of.h> |
| 14 | #include <asm/archrandom.h> |
| 15 | #include <asm/machdep.h> |
| Michael Ellerman | 148924f | 2013-11-20 11:05:02 +1100 | [diff] [blame] | 16 | #include <asm/plpar_wrappers.h> |
| Michael Ellerman | a489043 | 2013-10-11 14:07:59 +1100 | [diff] [blame] | 17 | |
| 18 | |
| 19 | static int pseries_get_random_long(unsigned long *v) |
| 20 | { |
| 21 | unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; |
| 22 | |
| 23 | if (plpar_hcall(H_RANDOM, retbuf) == H_SUCCESS) { |
| 24 | *v = retbuf[0]; |
| 25 | return 1; |
| 26 | } |
| 27 | |
| 28 | return 0; |
| 29 | } |
| 30 | |
| 31 | static __init int rng_init(void) |
| 32 | { |
| 33 | struct device_node *dn; |
| 34 | |
| 35 | dn = of_find_compatible_node(NULL, NULL, "ibm,random"); |
| 36 | if (!dn) |
| 37 | return -ENODEV; |
| 38 | |
| 39 | pr_info("Registering arch random hook.\n"); |
| 40 | |
| Paul Mackerras | 01c9348 | 2015-07-17 20:11:43 +1000 | [diff] [blame] | 41 | ppc_md.get_random_seed = pseries_get_random_long; |
| Michael Ellerman | a489043 | 2013-10-11 14:07:59 +1100 | [diff] [blame] | 42 | |
| 43 | return 0; |
| 44 | } |
| Michael Ellerman | 8e83e90 | 2014-07-16 12:02:43 +1000 | [diff] [blame] | 45 | machine_subsys_initcall(pseries, rng_init); |