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hw/misc: Add npcm7xx random number generator

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The RNG module returns a byte of randomness when the Data Valid bit is
set.

This implementation ignores the prescaler setting, and loads a new value
into RNGD every time RNGCS is read while the RNG is enabled and random
data is available.

A qtest featuring some simple randomness tests is included.

Reviewed-by: Tyrone Ting <kfting@nuvoton.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Havard Skinnemoen <hskinnemoen@google.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Havard Skinnemoen 2020-10-23 14:06:35 -07:00 • committed by Peter Maydell
parent 7d378ed6e3
commit 326ccfe240
9 changed files with 510 additions and 3 deletions
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2
include/hw/arm/npcm7xx.h
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@ -21,6 +21,7 @@
#include "hw/mem/npcm7xx_mc.h"
#include "hw/misc/npcm7xx_clk.h"
#include "hw/misc/npcm7xx_gcr.h"
#include "hw/misc/npcm7xx_rng.h"
#include "hw/nvram/npcm7xx_otp.h"
#include "hw/timer/npcm7xx_timer.h"
#include "hw/ssi/npcm7xx_fiu.h"
@ -75,6 +76,7 @@ typedef struct NPCM7xxState {
NPCM7xxOTPState key_storage;
NPCM7xxOTPState fuse_array;
NPCM7xxMCState mc;
NPCM7xxRNGState rng;
NPCM7xxFIUState fiu[2];
} NPCM7xxState;