ASoC: tlv312aic23: unbreak resume
[zen-stable.git] / drivers / char / hw_random / ixp4xx-rng.c
blob263567f5f3923fb12ae13d6401aa84f1b636aa07
1 /*
2 * drivers/char/hw_random/ixp4xx-rng.c
4 * RNG driver for Intel IXP4xx family of NPUs
6 * Author: Deepak Saxena <dsaxena@plexity.net>
8 * Copyright 2005 (c) MontaVista Software, Inc.
10 * Fixes by Michael Buesch
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.
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>
25 #include <asm/io.h>
26 #include <mach/hardware.h>
29 static int ixp4xx_rng_data_read(struct hwrng *rng, u32 *buffer)
31 void __iomem * rng_base = (void __iomem *)rng->priv;
33 *buffer = __raw_readl(rng_base);
35 return 4;
38 static struct hwrng ixp4xx_rng_ops = {
39 .name = "ixp4xx",
40 .data_read = ixp4xx_rng_data_read,
43 static int __init ixp4xx_rng_init(void)
45 void __iomem * rng_base;
46 int err;
48 rng_base = ioremap(0x70002100, 4);
49 if (!rng_base)
50 return -ENOMEM;
51 ixp4xx_rng_ops.priv = (unsigned long)rng_base;
52 err = hwrng_register(&ixp4xx_rng_ops);
53 if (err)
54 iounmap(rng_base);
56 return err;
59 static void __exit ixp4xx_rng_exit(void)
61 void __iomem * rng_base = (void __iomem *)ixp4xx_rng_ops.priv;
63 hwrng_unregister(&ixp4xx_rng_ops);
64 iounmap(rng_base);
67 module_init(ixp4xx_rng_init);
68 module_exit(ixp4xx_rng_exit);
70 MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net>");
71 MODULE_DESCRIPTION("H/W Random Number Generator (RNG) driver for IXP4xx");
72 MODULE_LICENSE("GPL");