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| 1 | /* |
| 2 | * drivers/char/hw_random/ixp4xx-rng.c |
| 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/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> |
| 26 | #include <mach/hardware.h> |
| 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 | |
| 48 | if (!cpu_is_ixp46x()) /* includes IXP455 */ |
| 49 | return -ENOSYS; |
| 50 | |
| 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 | |
| 70 | module_init(ixp4xx_rng_init); |
| 71 | module_exit(ixp4xx_rng_exit); |
| 72 | |
| 73 | MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net>"); |
| 74 | MODULE_DESCRIPTION("H/W Pseudo-Random Number Generator (RNG) driver for IXP45x/46x"); |
| 75 | MODULE_LICENSE("GPL"); |
| 76 |
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