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75 lines
2.5 KiB
Diff
75 lines
2.5 KiB
Diff
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From 846cd2c9eee7a99de29c743911cc047fdd56db02 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= <noltari@gmail.com>
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Date: Mon, 22 Feb 2021 20:41:04 +0100
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Subject: [PATCH] hwrng: bcm2835: add reset support
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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BCM6368 devices need to reset the in order to generate true random numbers.
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This is what BCM6368 produces without a reset:
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root@OpenWrt:/# cat /dev/hwrng | rngtest -c 1000
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rngtest 6.10
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Copyright (c) 2004 by Henrique de Moraes Holschuh
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This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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rngtest: starting FIPS tests...
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rngtest: bits received from input: 20000032
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rngtest: FIPS 140-2 successes: 0
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rngtest: FIPS 140-2 failures: 1000
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rngtest: FIPS 140-2(2001-10-10) Monobit: 2
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rngtest: FIPS 140-2(2001-10-10) Poker: 1000
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rngtest: FIPS 140-2(2001-10-10) Runs: 1000
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rngtest: FIPS 140-2(2001-10-10) Long run: 30
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rngtest: FIPS 140-2(2001-10-10) Continuous run: 0
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rngtest: input channel speed: (min=37.253; avg=320.827; max=635.783)Mibits/s
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rngtest: FIPS tests speed: (min=12.141; avg=15.034; max=16.428)Mibits/s
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rngtest: Program run time: 1336176 microseconds
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cat: write error: Broken pipe
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Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
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---
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drivers/char/hw_random/bcm2835-rng.c | 10 ++++++++++
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1 file changed, 10 insertions(+)
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--- a/drivers/char/hw_random/bcm2835-rng.c
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+++ b/drivers/char/hw_random/bcm2835-rng.c
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@@ -13,6 +13,7 @@
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#include <linux/platform_device.h>
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#include <linux/printk.h>
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#include <linux/clk.h>
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+#include <linux/reset.h>
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#define RNG_CTRL 0x0
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#define RNG_STATUS 0x4
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@@ -32,6 +33,7 @@ struct bcm2835_rng_priv {
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void __iomem *base;
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bool mask_interrupts;
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struct clk *clk;
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+ struct reset_control *reset;
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};
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static inline struct bcm2835_rng_priv *to_rng_priv(struct hwrng *rng)
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@@ -94,6 +96,10 @@ static int bcm2835_rng_init(struct hwrng
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return ret;
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}
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+ ret = reset_control_reset(priv->reset);
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+ if (ret)
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+ return ret;
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+
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if (priv->mask_interrupts) {
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/* mask the interrupt */
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val = rng_readl(priv, RNG_INT_MASK);
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@@ -159,6 +165,10 @@ static int bcm2835_rng_probe(struct plat
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if (PTR_ERR(priv->clk) == -EPROBE_DEFER)
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return -EPROBE_DEFER;
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+ priv->reset = devm_reset_control_get_optional_exclusive(dev, NULL);
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+ if (IS_ERR(priv->reset))
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+ return PTR_ERR(priv->reset);
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+
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priv->rng.name = pdev->name;
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priv->rng.init = bcm2835_rng_init;
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priv->rng.read = bcm2835_rng_read;
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