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authorGatien Chevallier <gatien.chevallier@foss.st.com>2023-09-21 10:02:59 +0200
committerHerbert Xu <herbert@gondor.apana.org.au>2023-10-01 16:28:15 +0800
commita1b03e7ade409125712313c04a97242e18aae88e (patch)
treed3f341fba92e1d640839862547376df743836efc /drivers/char/hw_random
parent28d13f3fdbe52192e3a961ed489b542b111a098e (diff)
hwrng: stm32 - support RNG configuration locking mechanism
If "st,rng-lock-conf" DT binding property is set for a stm32-rng node, the RNG configuration will be locked until next hardware block reset or platform reset. Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/char/hw_random')
-rw-r--r--drivers/char/hw_random/stm32-rng.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/char/hw_random/stm32-rng.c b/drivers/char/hw_random/stm32-rng.c
index 819f062f454d..4a602d666dad 100644
--- a/drivers/char/hw_random/stm32-rng.c
+++ b/drivers/char/hw_random/stm32-rng.c
@@ -62,6 +62,7 @@ struct stm32_rng_private {
struct reset_control *rst;
const struct stm32_rng_data *data;
bool ced;
+ bool lock_conf;
};
/*
@@ -301,6 +302,9 @@ static int stm32_rng_init(struct hwrng *rng)
reg &= ~RNG_CR_CONDRST;
reg |= RNG_CR_RNGEN;
+ if (priv->lock_conf)
+ reg |= RNG_CR_CONFLOCK;
+
writel_relaxed(reg, priv->base + RNG_CR);
err = readl_relaxed_poll_timeout_atomic(priv->base + RNG_CR, reg,
@@ -439,6 +443,7 @@ static int stm32_rng_probe(struct platform_device *ofdev)
}
priv->ced = of_property_read_bool(np, "clock-error-detect");
+ priv->lock_conf = of_property_read_bool(np, "st,rng-lock-conf");
priv->data = of_device_get_match_data(dev);
if (!priv->data)