• Krzysztof Kozlowski's avatar
    crypto: exynos - Add new Exynos RNG driver · c46ea13f
    Krzysztof Kozlowski authored
    Replace existing hw_ranndom/exynos-rng driver with a new, reworked one.
    This is a driver for pseudo random number generator block which on
    Exynos4 chipsets must be seeded with some value.  On newer Exynos5420
    chipsets it might seed itself from true random number generator block
    but this is not implemented yet.
    
    New driver is a complete rework to use the crypto ALGAPI instead of
    hw_random API.  Rationale for the change:
    1. hw_random interface is for true RNG devices.
    2. The old driver was seeding itself with jiffies which is not a
       reliable source for randomness.
    3. Device generates five random 32-bit numbers in each pass but old
       driver was returning only one 32-bit number thus its performance was
       reduced.
    
    Compatibility with DeviceTree bindings is preserved.
    
    New driver does not use runtime power management but manually enables
    and disables the clock when needed.  This is preferred approach because
    using runtime PM just to toggle clock is huge overhead.
    
    Another difference is reseeding itself with generated random data
    periodically and during resuming from system suspend (previously driver
    was re-seeding itself again with jiffies).
    Signed-off-by: default avatarKrzysztof Kozlowski <krzk@kernel.org>
    Reviewed-by: default avatarStephan Müller <smueller@chronox.de>
    Reviewed-by: default avatarPrasannaKumar Muralidharan <prasannatsmkumar@gmail.com>
    Reviewed-by: default avatarBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
    Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
    c46ea13f
Name
Last commit
Last update
..
accessibility Loading commit data...
acpi Loading commit data...
amba Loading commit data...
android Loading commit data...
ata Loading commit data...
atm Loading commit data...
auxdisplay Loading commit data...
base Loading commit data...
bcma Loading commit data...
block Loading commit data...
bluetooth Loading commit data...
bus Loading commit data...
cdrom Loading commit data...
char Loading commit data...
clk Loading commit data...
clocksource Loading commit data...
connector Loading commit data...
cpufreq Loading commit data...
cpuidle Loading commit data...
crypto Loading commit data...
dax Loading commit data...
dca Loading commit data...
devfreq Loading commit data...
dio Loading commit data...
dma Loading commit data...
dma-buf Loading commit data...
edac Loading commit data...
eisa Loading commit data...
extcon Loading commit data...
firewire Loading commit data...
firmware Loading commit data...
fmc Loading commit data...
fpga Loading commit data...
fsi Loading commit data...
gpio Loading commit data...
gpu Loading commit data...
hid Loading commit data...
hsi Loading commit data...
hv Loading commit data...
hwmon Loading commit data...
hwspinlock Loading commit data...
hwtracing Loading commit data...
i2c Loading commit data...
ide Loading commit data...
idle Loading commit data...
iio Loading commit data...
infiniband Loading commit data...
input Loading commit data...
iommu Loading commit data...
ipack Loading commit data...
irqchip Loading commit data...
isdn Loading commit data...
leds Loading commit data...
lguest Loading commit data...
lightnvm Loading commit data...
macintosh Loading commit data...
mailbox Loading commit data...
mcb Loading commit data...
md Loading commit data...
media Loading commit data...
memory Loading commit data...
memstick Loading commit data...
message Loading commit data...
mfd Loading commit data...
misc Loading commit data...
mmc Loading commit data...
mtd Loading commit data...
net Loading commit data...
nfc Loading commit data...
ntb Loading commit data...
nubus Loading commit data...
nvdimm Loading commit data...
nvme Loading commit data...
nvmem Loading commit data...
of Loading commit data...
oprofile Loading commit data...
parisc Loading commit data...
parport Loading commit data...
pci Loading commit data...
pcmcia Loading commit data...
perf Loading commit data...
phy Loading commit data...
pinctrl Loading commit data...
platform Loading commit data...
pnp Loading commit data...
power Loading commit data...
powercap Loading commit data...
pps Loading commit data...
ps3 Loading commit data...
ptp Loading commit data...
pwm Loading commit data...
rapidio Loading commit data...
ras Loading commit data...
regulator Loading commit data...
remoteproc Loading commit data...
reset Loading commit data...
rpmsg Loading commit data...
rtc Loading commit data...
s390 Loading commit data...
sbus Loading commit data...
scsi Loading commit data...
sfi Loading commit data...
sh Loading commit data...
sn Loading commit data...
soc Loading commit data...
spi Loading commit data...
spmi Loading commit data...
ssb Loading commit data...
staging Loading commit data...
target Loading commit data...
tc Loading commit data...
thermal Loading commit data...
thunderbolt Loading commit data...
tty Loading commit data...
uio Loading commit data...
usb Loading commit data...
uwb Loading commit data...
vfio Loading commit data...
vhost Loading commit data...
video Loading commit data...
virt Loading commit data...
virtio Loading commit data...
vlynq Loading commit data...
vme Loading commit data...
w1 Loading commit data...
watchdog Loading commit data...
xen Loading commit data...
zorro Loading commit data...
Kconfig Loading commit data...
Makefile Loading commit data...