projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 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> | |
| 18 | #include <linux/config.h> | |
| 19 | #include <linux/types.h> | |
| 20 | #include <linux/module.h> | |
| 21 | #include <linux/moduleparam.h> | |
| 22 | #include <linux/init.h> | |
| 23 | #include <linux/bitops.h> | |
| 24 | #include <linux/hw_random.h> | |
| 25 | ||
| 26 | #include <asm/io.h> | |
| 27 | #include <asm/hardware.h> | |
| 28 | ||
| 29 | ||
| 30 | static int ixp4xx_rng_data_read(struct hwrng *rng, u32 *buffer) | |
| 31 | { | |
| 32 | void __iomem * rng_base = (void __iomem *)rng->priv; | |
| 33 | ||
| 34 | *buffer = __raw_readl(rng_base); | |
| 35 | ||
| 36 | return 4; | |
| 37 | } | |
| 38 | ||
| 39 | static struct hwrng ixp4xx_rng_ops = { | |
| 40 | .name = "ixp4xx", | |
| 41 | .data_read = ixp4xx_rng_data_read, | |
| 42 | }; | |
| 43 | ||
| 44 | static int __init ixp4xx_rng_init(void) | |
| 45 | { | |
| 46 | void __iomem * rng_base; | |
| 47 | int err; | |
| 48 | ||
| 49 | rng_base = ioremap(0x70002100, 4); | |
| 50 | if (!rng_base) | |
| 51 | return -ENOMEM; | |
| 52 | ixp4xx_rng_ops.priv = (unsigned long)rng_base; | |
| 53 | err = hwrng_register(&ixp4xx_rng_ops); | |
| 54 | if (err) | |
| 55 | iounmap(rng_base); | |
| 56 | ||
| 57 | return err; | |
| 58 | } | |
| 59 | ||
| 60 | static void __exit ixp4xx_rng_exit(void) | |
| 61 | { | |
| 62 | void __iomem * rng_base = (void __iomem *)ixp4xx_rng_ops.priv; | |
| 63 | ||
| 64 | hwrng_unregister(&ixp4xx_rng_ops); | |
| 65 | iounmap(rng_base); | |
| 66 | } | |
| 67 | ||
| 68 | subsys_initcall(ixp4xx_rng_init); | |
| 69 | module_exit(ixp4xx_rng_exit); | |
| 70 | ||
| 71 | MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net>"); | |
| 72 | MODULE_DESCRIPTION("H/W Random Number Generator (RNG) driver for IXP4xx"); | |
| 73 | MODULE_LICENSE("GPL"); |