linux-toradex.git/drivers/char/hw_random/timeriomem-rng.c, branch v5.16

hwrng: timeriomem - Use device-managed registration API

2021-02-10T06:56:01+00:00

Use devm_hwrng_register to get rid of manual unregistration.

Signed-off-by: Tian Tao 
Signed-off-by: Herbert Xu

hwrng: timeriomem - Fix cooldown period calculation

2021-02-10T06:55:55+00:00

Ensure cooldown period tolerance of 1% is actually accounted for.

Fixes: ca3bff70ab32 ("hwrng: timeriomem - Improve performance...")
Signed-off-by: Jan Henrik Weinstock 
Signed-off-by: Herbert Xu

hwrng: timeriomem - relax check on memory resource size

2019-09-05T04:37:30+00:00

The timeriomem_rng driver only accesses the first 4 bytes of the given
memory area and currently, it also forces that memory resource to be
exactly 4 bytes in size.

This, however, is problematic when used with device-trees that are
generated from things like FPGA toolchains, where the minimum size
of an exposed memory block may be something like 4k.

Hence, let's only check for what's needed for the driver to operate
properly; namely that we have enough memory available to read the
random data from.

Signed-off-by: Daniel Mack 
Signed-off-by: Herbert Xu

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500

2019-06-19T15:09:55+00:00

Based on 2 normalized pattern(s):

  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

  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 #

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 4122 file(s).

Signed-off-by: Thomas Gleixner 
Reviewed-by: Enrico Weigelt 
Reviewed-by: Kate Stewart 
Reviewed-by: Allison Randal 
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de
Signed-off-by: Greg Kroah-Hartman

hwrng: timeriomem - Remove 'max < 4' condition check

2017-09-22T09:43:14+00:00

In read routiene max is always >= 4. The check whether 'max < 4' is not
necessary. Remove it.

Signed-off-by: PrasannaKumar Muralidharan 
Acked-By: Rick Altherr 
Signed-off-by: Herbert Xu

hw_random: timeriomem_rng: Allow setting RNG quality from platform data

2017-06-01T04:55:58+00:00

When a hw_random device's quality is non-zero, it will automatically be
used to fill the kernel's entropy pool.  Since timeriomem_rng is used by
many different devices, the quality needs to be provided by platform
data or device tree.

Signed-off-by: Rick Altherr 
Signed-off-by: Herbert Xu

hwrng: timeriomem - Improve performance for sub-jiffie update periods

2017-04-10T11:17:25+00:00

Some hardware RNGs provide a single register for obtaining random data.
Instead of signaling when new data is available, the reader must wait a
fixed amount of time between reads for new data to be generated.
timeriomem_rng implements this scheme with the period specified in
platform data or device tree.  While the period is specified in
microseconds, the implementation used a standard timer which has a
minimum delay of 1 jiffie and caused a significant bottleneck for
devices that can update at 1us.  By switching to an hrtimer, 1us periods
now only delay at most 2us per read.

Signed-off-by: Rick Altherr 
Signed-off-by: Herbert Xu

hwrng: timeriomem - Shorten verbose type and variable names

2017-04-10T11:17:25+00:00

No functional changes.

Signed-off-by: Rick Altherr 
Signed-off-by: Herbert Xu

hwrng: timeriomem - Migrate to new API

2017-04-10T11:17:23+00:00

Preserves the existing behavior of only returning 32-bits per call.

Signed-off-by: Rick Altherr 
Signed-off-by: Herbert Xu

char: hw_random: drop owner assignment from platform_drivers

2014-10-20T14:20:20+00:00

A platform_driver does not need to set an owner, it will be populated by the
driver core.

Signed-off-by: Wolfram Sang