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hwrng: timeriomem - New driver

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Some hardware platforms, the TS-7800[1] is one for example, can
supply the kernel with an entropy source, albeit a slow one for
TS-7800 users, by just reading a particular IO address.  This
source must not be read above a certain rate otherwise the quality
suffers.

The driver is then hooked into by calling
platform_device_(register|add|del) passing a structure similar to:
------
static struct timeriomem_rng_data ts78xx_ts_rng_data = {
        .address        = (u32 *__iomem) TS_RNG,
        .period         = 1000000, /* one second */
};

static struct platform_device ts78xx_ts_rng_device = {
        .name           = "timeriomem_rng",
        .id             = -1,
        .dev            = {
                .platform_data  = &ts78xx_ts_rng_data,
        },
        .num_resources  = 0,
};
------

[1] http://www.embeddedarm.com/products/board-detail.php?product=TS-7800

Signed-off-by: Alexander Clouter <alex@digriz.org.uk>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Alexander Clouter 2009-02-22 12:03:56 +08:00 • committed by Herbert Xu
parent 0a2e821d62
commit 9c3c133b1e
4 changed files with 187 additions and 0 deletions
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21
include/linux/timeriomem-rng.h Normal file
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@ -0,0 +1,21 @@
/*
* linux/include/linux/timeriomem-rng.h
*
* Copyright (c) 2009 Alexander Clouter <alex@digriz.org.uk>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/completion.h>
struct timeriomem_rng_data {
struct completion completion;
unsigned int present:1;
u32 __iomem *address;
/* measures in usecs */
unsigned int period;
};