From: "Álvaro Fernández Rojas" <noltari@gmail.com>
To: "Matt Mackall" <mpm@selenic.com>,
"Herbert Xu" <herbert@gondor.apana.org.au>,
"Rob Herring" <robh+dt@kernel.org>,
"Nicolas Saenz Julienne" <nsaenzjulienne@suse.de>,
"Florian Fainelli" <f.fainelli@gmail.com>,
"Ray Jui" <rjui@broadcom.com>,
"Scott Branden" <sbranden@broadcom.com>,
bcm-kernel-feedback-list@broadcom.com,
"Philipp Zabel" <p.zabel@pengutronix.de>,
"Mark Brown" <broonie@kernel.org>,
"Álvaro Fernández Rojas" <noltari@gmail.com>,
"Guenter Roeck" <linux@roeck-us.net>,
"Bjorn Andersson" <bjorn.andersson@linaro.org>,
"Nícolas F. R. A. Prado" <nfraprado@protonmail.com>,
"Rikard Falkeborn" <rikard.falkeborn@gmail.com>,
"Stefan Wahren" <stefan.wahren@i2se.com>,
linux-crypto@vger.kernel.org, devicetree@vger.kernel.org,
linux-rpi-kernel@lists.infradead.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v3 2/2] hwrng: bcm2835: add reset support
Date: Tue, 23 Feb 2021 18:00:06 +0100 [thread overview]
Message-ID: <20210223170006.29558-3-noltari@gmail.com> (raw)
In-Reply-To: <20210223170006.29558-1-noltari@gmail.com>
BCM6368 devices need to reset the in order to generate true random numbers.
This is what BCM6368 produces without a reset:
root@OpenWrt:/# cat /dev/hwrng | rngtest -c 1000
rngtest 6.10
Copyright (c) 2004 by Henrique de Moraes Holschuh
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
rngtest: starting FIPS tests...
rngtest: bits received from input: 20000032
rngtest: FIPS 140-2 successes: 0
rngtest: FIPS 140-2 failures: 1000
rngtest: FIPS 140-2(2001-10-10) Monobit: 2
rngtest: FIPS 140-2(2001-10-10) Poker: 1000
rngtest: FIPS 140-2(2001-10-10) Runs: 1000
rngtest: FIPS 140-2(2001-10-10) Long run: 30
rngtest: FIPS 140-2(2001-10-10) Continuous run: 0
rngtest: input channel speed: (min=37.253; avg=320.827; max=635.783)Mibits/s
rngtest: FIPS tests speed: (min=12.141; avg=15.034; max=16.428)Mibits/s
rngtest: Program run time: 1336176 microseconds
cat: write error: Broken pipe
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
---
v3: no changes.
v2: no changes.
drivers/char/hw_random/bcm2835-rng.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/char/hw_random/bcm2835-rng.c b/drivers/char/hw_random/bcm2835-rng.c
index 1a7c43b43c6b..1b93a896d8e8 100644
--- a/drivers/char/hw_random/bcm2835-rng.c
+++ b/drivers/char/hw_random/bcm2835-rng.c
@@ -13,6 +13,7 @@
#include <linux/platform_device.h>
#include <linux/printk.h>
#include <linux/clk.h>
+#include <linux/reset.h>
#define RNG_CTRL 0x0
#define RNG_STATUS 0x4
@@ -32,6 +33,7 @@ struct bcm2835_rng_priv {
void __iomem *base;
bool mask_interrupts;
struct clk *clk;
+ struct reset_control *reset;
};
static inline struct bcm2835_rng_priv *to_rng_priv(struct hwrng *rng)
@@ -94,6 +96,10 @@ static int bcm2835_rng_init(struct hwrng *rng)
return ret;
}
+ ret = reset_control_reset(priv->reset);
+ if (ret)
+ return ret;
+
if (priv->mask_interrupts) {
/* mask the interrupt */
val = rng_readl(priv, RNG_INT_MASK);
@@ -159,6 +165,10 @@ static int bcm2835_rng_probe(struct platform_device *pdev)
if (PTR_ERR(priv->clk) == -EPROBE_DEFER)
return -EPROBE_DEFER;
+ priv->reset = devm_reset_control_get_optional_exclusive(dev, NULL);
+ if (IS_ERR(priv->reset))
+ return PTR_ERR(priv->reset);
+
priv->rng.name = pdev->name;
priv->rng.init = bcm2835_rng_init;
priv->rng.read = bcm2835_rng_read;
--
2.20.1
next prev parent reply other threads:[~2021-02-23 17:01 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-22 19:45 [PATCH] hwrng: bcm2835: add reset support Álvaro Fernández Rojas
2021-02-23 16:01 ` [PATCH 0/2] " Álvaro Fernández Rojas
2021-02-23 16:01 ` [PATCH 1/2] dt-bindings: rng: bcm2835: document " Álvaro Fernández Rojas
2021-02-23 16:36 ` Florian Fainelli
2021-02-23 17:17 ` Scott Branden
2021-02-23 17:22 ` Álvaro Fernández Rojas
2021-02-23 16:01 ` [PATCH 2/2] hwrng: bcm2835: add " Álvaro Fernández Rojas
2021-02-24 8:22 ` [PATCH v4 0/2] " Álvaro Fernández Rojas
2021-02-24 8:22 ` [PATCH v4 1/2] dt-bindings: rng: bcm2835: document " Álvaro Fernández Rojas
2021-02-24 8:22 ` [PATCH v4 2/2] hwrng: bcm2835: add " Álvaro Fernández Rojas
2021-03-03 13:52 ` Philipp Zabel
2021-03-03 14:06 ` Álvaro Fernández Rojas
2021-03-03 19:16 ` Florian Fainelli
2021-02-23 17:00 ` [PATCH v3 0/2] " Álvaro Fernández Rojas
2021-02-23 17:00 ` [PATCH v3 1/2] dt-bindings: rng: bcm2835: document " Álvaro Fernández Rojas
2021-02-23 19:34 ` Rob Herring
2021-02-23 20:48 ` Álvaro Fernández Rojas
2021-03-04 12:07 ` Nicolas Saenz Julienne
2021-03-04 12:18 ` Álvaro Fernández Rojas
2021-03-04 13:30 ` Nicolas Saenz Julienne
2021-03-04 14:57 ` Álvaro Fernández Rojas
2021-03-04 19:58 ` Rob Herring
2021-02-23 17:00 ` Álvaro Fernández Rojas [this message]
2021-02-23 20:43 ` [PATCH v3 2/2] hwrng: bcm2835: add " Florian Fainelli
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210223170006.29558-3-noltari@gmail.com \
--to=noltari@gmail.com \
--cc=bcm-kernel-feedback-list@broadcom.com \
--cc=bjorn.andersson@linaro.org \
--cc=broonie@kernel.org \
--cc=devicetree@vger.kernel.org \
--cc=f.fainelli@gmail.com \
--cc=herbert@gondor.apana.org.au \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-crypto@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-rpi-kernel@lists.infradead.org \
--cc=linux@roeck-us.net \
--cc=mpm@selenic.com \
--cc=nfraprado@protonmail.com \
--cc=nsaenzjulienne@suse.de \
--cc=p.zabel@pengutronix.de \
--cc=rikard.falkeborn@gmail.com \
--cc=rjui@broadcom.com \
--cc=robh+dt@kernel.org \
--cc=sbranden@broadcom.com \
--cc=stefan.wahren@i2se.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).