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Commit | Line | Data |
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d7174bcb | 1 | /* |
f30c2269 | 2 | * drivers/char/hw_random/ixp4xx-rng.c |
d7174bcb MB |
3 | * |
4 | * RNG driver for Intel IXP4xx family of NPUs | |
5 | * | |
6 | * Author: Deepak Saxena <dsaxena@plexity.net> | |
7 | * | |
8 | * Copyright 2005 (c) MontaVista Software, Inc. | |
9 | * | |
10 | * Fixes by Michael Buesch | |
11 | * | |
12 | * This file is licensed under the terms of the GNU General Public | |
13 | * License version 2. This program is licensed "as is" without any | |
14 | * warranty of any kind, whether express or implied. | |
15 | */ | |
16 | ||
17 | #include <linux/kernel.h> | |
d7174bcb MB |
18 | #include <linux/types.h> |
19 | #include <linux/module.h> | |
20 | #include <linux/moduleparam.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/bitops.h> | |
23 | #include <linux/hw_random.h> | |
24 | ||
25 | #include <asm/io.h> | |
a09e64fb | 26 | #include <mach/hardware.h> |
d7174bcb MB |
27 | |
28 | ||
29 | static int ixp4xx_rng_data_read(struct hwrng *rng, u32 *buffer) | |
30 | { | |
31 | void __iomem * rng_base = (void __iomem *)rng->priv; | |
32 | ||
33 | *buffer = __raw_readl(rng_base); | |
34 | ||
35 | return 4; | |
36 | } | |
37 | ||
38 | static struct hwrng ixp4xx_rng_ops = { | |
39 | .name = "ixp4xx", | |
40 | .data_read = ixp4xx_rng_data_read, | |
41 | }; | |
42 | ||
43 | static int __init ixp4xx_rng_init(void) | |
44 | { | |
45 | void __iomem * rng_base; | |
46 | int err; | |
47 | ||
553da857 KH |
48 | if (!cpu_is_ixp46x()) /* includes IXP455 */ |
49 | return -ENOSYS; | |
50 | ||
d7174bcb MB |
51 | rng_base = ioremap(0x70002100, 4); |
52 | if (!rng_base) | |
53 | return -ENOMEM; | |
54 | ixp4xx_rng_ops.priv = (unsigned long)rng_base; | |
55 | err = hwrng_register(&ixp4xx_rng_ops); | |
56 | if (err) | |
57 | iounmap(rng_base); | |
58 | ||
59 | return err; | |
60 | } | |
61 | ||
62 | static void __exit ixp4xx_rng_exit(void) | |
63 | { | |
64 | void __iomem * rng_base = (void __iomem *)ixp4xx_rng_ops.priv; | |
65 | ||
66 | hwrng_unregister(&ixp4xx_rng_ops); | |
67 | iounmap(rng_base); | |
68 | } | |
69 | ||
56fb5fe9 | 70 | module_init(ixp4xx_rng_init); |
d7174bcb MB |
71 | module_exit(ixp4xx_rng_exit); |
72 | ||
73 | MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net>"); | |
553da857 | 74 | MODULE_DESCRIPTION("H/W Pseudo-Random Number Generator (RNG) driver for IXP45x/46x"); |
d7174bcb | 75 | MODULE_LICENSE("GPL"); |