projects / mirror_ubuntu-jammy-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| a489043f ME |
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> | |
| 148924f7 | 16 | #include <asm/plpar_wrappers.h> |
| a489043f ME |
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 | ||
| 41 | ppc_md.get_random_long = pseries_get_random_long; | |
| 42 | ||
| 43 | return 0; | |
| 44 | } | |
| 45 | subsys_initcall(rng_init); |