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| author | Havard Skinnemoen <hskinnemoen@google.com> | 2020-10-23 14:06:35 -0700 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2020-10-27 11:10:10 +0000 |
| commit | 326ccfe240ca9ef4f659a241b39390fa956e999b (patch) | |
| tree | ae846cdf53e92e1d0d629d1f5a5e7a230effda7b /hw/arm/npcm7xx.c | |
| parent | 7d378ed6e3b4a26f4da887fcccc4c6f1db3dcd42 (diff) | |
| download | focaccia-qemu-326ccfe240ca9ef4f659a241b39390fa956e999b.tar.gz focaccia-qemu-326ccfe240ca9ef4f659a241b39390fa956e999b.zip | |
hw/misc: Add npcm7xx random number generator
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>
Diffstat (limited to 'hw/arm/npcm7xx.c')
| -rw-r--r-- | hw/arm/npcm7xx.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/hw/arm/npcm7xx.c b/hw/arm/npcm7xx.c index c341dcab8b..cb4db41c54 100644 --- a/hw/arm/npcm7xx.c +++ b/hw/arm/npcm7xx.c @@ -44,6 +44,7 @@ #define NPCM7XX_GCR_BA (0xf0800000) #define NPCM7XX_CLK_BA (0xf0801000) #define NPCM7XX_MC_BA (0xf0824000) +#define NPCM7XX_RNG_BA (0xf000b000) /* Internal AHB SRAM */ #define NPCM7XX_RAM3_BA (0xc0008000) @@ -256,6 +257,7 @@ static void npcm7xx_init(Object *obj) object_initialize_child(obj, "otp2", &s->fuse_array, TYPE_NPCM7XX_FUSE_ARRAY); object_initialize_child(obj, "mc", &s->mc, TYPE_NPCM7XX_MC); + object_initialize_child(obj, "rng", &s->rng, TYPE_NPCM7XX_RNG); for (i = 0; i < ARRAY_SIZE(s->tim); i++) { object_initialize_child(obj, "tim[*]", &s->tim[i], TYPE_NPCM7XX_TIMER); @@ -374,6 +376,10 @@ static void npcm7xx_realize(DeviceState *dev, Error **errp) serial_hd(i), DEVICE_LITTLE_ENDIAN); } + /* Random Number Generator. Cannot fail. */ + sysbus_realize(SYS_BUS_DEVICE(&s->rng), &error_abort); + sysbus_mmio_map(SYS_BUS_DEVICE(&s->rng), 0, NPCM7XX_RNG_BA); + /* * Flash Interface Unit (FIU). Can fail if incorrect number of chip selects * specified, but this is a programming error. @@ -412,7 +418,6 @@ static void npcm7xx_realize(DeviceState *dev, Error **errp) create_unimplemented_device("npcm7xx.vdmx", 0xe0800000, 4 * KiB); create_unimplemented_device("npcm7xx.pcierc", 0xe1000000, 64 * KiB); create_unimplemented_device("npcm7xx.kcs", 0xf0007000, 4 * KiB); - create_unimplemented_device("npcm7xx.rng", 0xf000b000, 4 * KiB); create_unimplemented_device("npcm7xx.adc", 0xf000c000, 4 * KiB); create_unimplemented_device("npcm7xx.gfxi", 0xf000e000, 4 * KiB); create_unimplemented_device("npcm7xx.gpio[0]", 0xf0010000, 4 * KiB); |