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authorAlexander Clouter <alex@digriz.org.uk>2009-02-22 12:03:56 +0800
committerHerbert Xu <herbert@gondor.apana.org.au>2009-02-22 12:03:56 +0800
commit9c3c133b1ed6e6d01bfabb6de29bf3d0f0886354 (patch)
tree2e6b7184477f75820ce0947df0786920880e4d42 /drivers/char/hw_random/Kconfig
parent0a2e821d627ad5ced23cf31137625b81cc205e0f (diff)
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 'drivers/char/hw_random/Kconfig')
-rw-r--r--drivers/char/hw_random/Kconfig14
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig
index 8822eca58ffa..e86dd425a70f 100644
--- a/drivers/char/hw_random/Kconfig
+++ b/drivers/char/hw_random/Kconfig
@@ -20,6 +20,20 @@ config HW_RANDOM
If unsure, say Y.
+config HW_RANDOM_TIMERIOMEM
+ tristate "Timer IOMEM HW Random Number Generator support"
+ depends on HW_RANDOM
+ ---help---
+ This driver provides kernel-side support for a generic Random
+ Number Generator used by reading a 'dumb' iomem address that
+ is to be read no faster than, for example, once a second;
+ the default FPGA bitstream on the TS-7800 has such functionality.
+
+ To compile this driver as a module, choose M here: the
+ module will be called timeriomem-rng.
+
+ If unsure, say Y.
+
config HW_RANDOM_INTEL
tristate "Intel HW Random Number Generator support"
depends on HW_RANDOM && (X86 || IA64) && PCI