linux.git/drivers/char/hw_random, branch v6.5

hwrng: imx-rngc - switch to DEFINE_SIMPLE_DEV_PM_OPS

2023-06-23T08:15:37+00:00

SIMPLE_DEV_PM_OPS is deprecated, replace it with DEFINE_SIMPLE_DEV_PM_OPS
and use pm_sleep_ptr for setting the driver's pm routines. We can now
remove the __maybe_unused qualifier in the suspend and resume functions.

Signed-off-by: Martin Kaiser 
Signed-off-by: Herbert Xu

hwrng: st - keep clock enabled while hwrng is registered

2023-06-23T08:15:37+00:00

The st-rng driver uses devres to register itself with the hwrng core,
the driver will be unregistered from hwrng when its device goes out of
scope. This happens after the driver's remove function is called.

However, st-rng's clock is disabled in the remove function. There's a
short timeframe where st-rng is still registered with the hwrng core
although its clock is disabled. I suppose the clock must be active to
access the hardware and serve requests from the hwrng core.

Switch to devm_clk_get_enabled and let devres disable the clock and
unregister the hwrng. This avoids the race condition.

Fixes: 3e75241be808 ("hwrng: drivers - Use device-managed registration API")
Signed-off-by: Martin Kaiser 
Signed-off-by: Herbert Xu

hwrng: st - support compile-testing

2023-06-23T08:15:37+00:00

Allow compile-testing the st-rng driver if we're not running on an ST
chipset.

Signed-off-by: Martin Kaiser 
Signed-off-by: Herbert Xu

hwrng: imx-rngc - fix the timeout for init and self check

2023-06-23T08:15:37+00:00

Fix the timeout that is used for the initialisation and for the self
test. wait_for_completion_timeout expects a timeout in jiffies, but
RNGC_TIMEOUT is in milliseconds. Call msecs_to_jiffies to do the
conversion.

Cc: stable@vger.kernel.org
Fixes: 1d5449445bd0 ("hwrng: mx-rngc - add a driver for Freescale RNGC")
Signed-off-by: Martin Kaiser 
Signed-off-by: Herbert Xu

hwrng: cn10k - Add extended trng register support

2023-06-02T10:21:32+00:00

The way random data is read from hardware has changed from
Octeon CN10KA-B0 and later SoCs onwards. A new set of registers
have been added to read random data and to verify whether the
read data is valid or not. This patch extends and uses
RNM_PF_TRNG_DAT and RNM_PF_TRNG_STS CSRs to read random number
and status for the applicable silicon variants.

Signed-off-by: Bharat Bhushan 
Signed-off-by: Herbert Xu

hwrng: imx-rngc - don't init of_device_id's data

2023-05-24T10:12:33+00:00

We have no device-specific data for fsl,imx25-rngb. There's no need to
set .data = NULL, this is the default.

Signed-off-by: Martin Kaiser 
Signed-off-by: Herbert Xu

hwrng: imx-rngc - mark the probe function as __init

2023-05-24T10:12:33+00:00

Mark the imx_rngc_probe function as __init.

There's no need to support hotplugging in the imx-rngc driver. We use
module_platform_driver_probe, the probe function will only be called at
startup.

Signed-off-by: Martin Kaiser 
Signed-off-by: Herbert Xu

hwrng: imx-rngc - use BIT(x) for register bit defines

2023-05-24T10:12:33+00:00

Rewrite the defines for register bits to use BIT(x) instead of writing
out the 32-bit number. This makes it easier to compare the code with the
register descriptions in the reference manual.

Signed-off-by: Martin Kaiser 
Signed-off-by: Herbert Xu

hwrng: imx-rngc - use bitfield macros to read rng type

2023-05-24T10:12:33+00:00

Use the mechanism from bitfield.h to read the rng type field in the
version_id register. This makes the code a tiny bit simpler.

Signed-off-by: Martin Kaiser 
Signed-off-by: Herbert Xu

hwrng: imx-rngc - simpler check for available random bytes

2023-05-24T10:12:33+00:00

The "level" field in the status register contains the number of random
bytes that are available in the FIFO.  Use GENMASK to extract this field.
We only want to check if level is 0 or if we can read another byte.
There's no need for the shift or the level variable.

Signed-off-by: Martin Kaiser 
Signed-off-by: Herbert Xu