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author | Alexander Clouter <alex@digriz.org.uk> | 2009-02-22 12:03:56 +0800 |
---|---|---|
committer | Herbert Xu <herbert@gondor.apana.org.au> | 2009-02-22 12:03:56 +0800 |
commit | 9c3c133b1ed6e6d01bfabb6de29bf3d0f0886354 (patch) | |
tree | 2e6b7184477f75820ce0947df0786920880e4d42 /include/linux/timeriomem-rng.h | |
parent | 0a2e821d627ad5ced23cf31137625b81cc205e0f (diff) | |
download | linux-stable-9c3c133b1ed6e6d01bfabb6de29bf3d0f0886354.tar.gz linux-stable-9c3c133b1ed6e6d01bfabb6de29bf3d0f0886354.tar.bz2 linux-stable-9c3c133b1ed6e6d01bfabb6de29bf3d0f0886354.zip |
hwrng: timeriomem - New driver
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>
Diffstat (limited to 'include/linux/timeriomem-rng.h')
-rw-r--r-- | include/linux/timeriomem-rng.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/include/linux/timeriomem-rng.h b/include/linux/timeriomem-rng.h new file mode 100644 index 000000000000..dd253177f65f --- /dev/null +++ b/include/linux/timeriomem-rng.h @@ -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; +}; |