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[88.1.105.170]) by smtp.gmail.com with ESMTPSA id h15sm33999381wrh.13.2021.02.23.08.01.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 23 Feb 2021 08:01:37 -0800 (PST) From: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= To: Matt Mackall , Herbert Xu , Rob Herring , Florian Fainelli , Ray Jui , Scott Branden , bcm-kernel-feedback-list@broadcom.com, Nicolas Saenz Julienne , Philipp Zabel , Alexandru Ardelean , Neil Armstrong , Lee Jones , =?UTF-8?q?N=C3=ADcolas=20F=2E=20R=2E=20A=2E=20Prado?= , =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= , Rikard Falkeborn , Stefan Wahren , 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 2/2] hwrng: bcm2835: add reset support Date: Tue, 23 Feb 2021 17:01:31 +0100 Message-Id: <20210223160131.29053-3-noltari@gmail.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210223160131.29053-1-noltari@gmail.com> References: <20210222194510.14004-1-noltari@gmail.com> <20210223160131.29053-1-noltari@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org 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 Signed-off-by: Álvaro Fernández Rojas --- 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 #include #include +#include #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 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.7 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_SIGNED,DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6371CC433DB for ; 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[88.1.105.170]) by smtp.gmail.com with ESMTPSA id h15sm33999381wrh.13.2021.02.23.08.01.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 23 Feb 2021 08:01:37 -0800 (PST) From: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= To: Matt Mackall , Herbert Xu , Rob Herring , Florian Fainelli , Ray Jui , Scott Branden , bcm-kernel-feedback-list@broadcom.com, Nicolas Saenz Julienne , Philipp Zabel , Alexandru Ardelean , Neil Armstrong , Lee Jones , =?UTF-8?q?N=C3=ADcolas=20F=2E=20R=2E=20A=2E=20Prado?= , =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= , Rikard Falkeborn , Stefan Wahren , 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 2/2] hwrng: bcm2835: add reset support Date: Tue, 23 Feb 2021 17:01:31 +0100 Message-Id: <20210223160131.29053-3-noltari@gmail.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210223160131.29053-1-noltari@gmail.com> References: <20210222194510.14004-1-noltari@gmail.com> <20210223160131.29053-1-noltari@gmail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210223_110140_665133_DA2BF1A2 X-CRM114-Status: GOOD ( 15.90 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org QkNNNjM2OCBkZXZpY2VzIG5lZWQgdG8gcmVzZXQgdGhlIGluIG9yZGVyIHRvIGdlbmVyYXRlIHRy dWUgcmFuZG9tIG51bWJlcnMuClRoaXMgaXMgd2hhdCBCQ002MzY4IHByb2R1Y2VzIHdpdGhvdXQg YSByZXNldDoKcm9vdEBPcGVuV3J0Oi8jIGNhdCAvZGV2L2h3cm5nIHwgcm5ndGVzdCAtYyAxMDAw CnJuZ3Rlc3QgNi4xMApDb3B5cmlnaHQgKGMpIDIwMDQgYnkgSGVucmlxdWUgZGUgTW9yYWVzIEhv bHNjaHVoClRoaXMgaXMgZnJlZSBzb2Z0d2FyZTsgc2VlIHRoZSBzb3VyY2UgZm9yIGNvcHlpbmcg Y29uZGl0aW9ucy4gIFRoZXJlIGlzIE5PIHdhcnJhbnR5OyBub3QgZXZlbiBmb3IgTUVSQ0hBTlRB QklMSVRZIG9yIEZJVE5FU1MgRk9SIEEgUEFSVElDVUxBUiBQVVJQT1NFLgoKcm5ndGVzdDogc3Rh cnRpbmcgRklQUyB0ZXN0cy4uLgpybmd0ZXN0OiBiaXRzIHJlY2VpdmVkIGZyb20gaW5wdXQ6IDIw MDAwMDMyCnJuZ3Rlc3Q6IEZJUFMgMTQwLTIgc3VjY2Vzc2VzOiAwCnJuZ3Rlc3Q6IEZJUFMgMTQw LTIgZmFpbHVyZXM6IDEwMDAKcm5ndGVzdDogRklQUyAxNDAtMigyMDAxLTEwLTEwKSBNb25vYml0 OiAyCnJuZ3Rlc3Q6IEZJUFMgMTQwLTIoMjAwMS0xMC0xMCkgUG9rZXI6IDEwMDAKcm5ndGVzdDog RklQUyAxNDAtMigyMDAxLTEwLTEwKSBSdW5zOiAxMDAwCnJuZ3Rlc3Q6IEZJUFMgMTQwLTIoMjAw MS0xMC0xMCkgTG9uZyBydW46IDMwCnJuZ3Rlc3Q6IEZJUFMgMTQwLTIoMjAwMS0xMC0xMCkgQ29u dGludW91cyBydW46IDAKcm5ndGVzdDogaW5wdXQgY2hhbm5lbCBzcGVlZDogKG1pbj0zNy4yNTM7 IGF2Zz0zMjAuODI3OyBtYXg9NjM1Ljc4MylNaWJpdHMvcwpybmd0ZXN0OiBGSVBTIHRlc3RzIHNw ZWVkOiAobWluPTEyLjE0MTsgYXZnPTE1LjAzNDsgbWF4PTE2LjQyOClNaWJpdHMvcwpybmd0ZXN0 OiBQcm9ncmFtIHJ1biB0aW1lOiAxMzM2MTc2IG1pY3Jvc2Vjb25kcwoKU2lnbmVkLW9mZi1ieTog w4FsdmFybyBGZXJuw6FuZGV6IFJvamFzIDxub2x0YXJpQGdtYWlsLmNvbT4KLS0tCiB2Mjogbm8g Y2hhbmdlcy4KCiBkcml2ZXJzL2NoYXIvaHdfcmFuZG9tL2JjbTI4MzUtcm5nLmMgfCAxMCArKysr KysrKysrCiAxIGZpbGUgY2hhbmdlZCwgMTAgaW5zZXJ0aW9ucygrKQoKZGlmZiAtLWdpdCBhL2Ry aXZlcnMvY2hhci9od19yYW5kb20vYmNtMjgzNS1ybmcuYyBiL2RyaXZlcnMvY2hhci9od19yYW5k b20vYmNtMjgzNS1ybmcuYwppbmRleCAxYTdjNDNiNDNjNmIuLjFiOTNhODk2ZDhlOCAxMDA2NDQK LS0tIGEvZHJpdmVycy9jaGFyL2h3X3JhbmRvbS9iY20yODM1LXJuZy5jCisrKyBiL2RyaXZlcnMv Y2hhci9od19yYW5kb20vYmNtMjgzNS1ybmcuYwpAQCAtMTMsNiArMTMsNyBAQAogI2luY2x1ZGUg PGxpbnV4L3BsYXRmb3JtX2RldmljZS5oPgogI2luY2x1ZGUgPGxpbnV4L3ByaW50ay5oPgogI2lu Y2x1ZGUgPGxpbnV4L2Nsay5oPgorI2luY2x1ZGUgPGxpbnV4L3Jlc2V0Lmg+CiAKICNkZWZpbmUg Uk5HX0NUUkwJMHgwCiAjZGVmaW5lIFJOR19TVEFUVVMJMHg0CkBAIC0zMiw2ICszMyw3IEBAIHN0 cnVjdCBiY20yODM1X3JuZ19wcml2IHsKIAl2b2lkIF9faW9tZW0gKmJhc2U7CiAJYm9vbCBtYXNr X2ludGVycnVwdHM7CiAJc3RydWN0IGNsayAqY2xrOworCXN0cnVjdCByZXNldF9jb250cm9sICpy ZXNldDsKIH07CiAKIHN0YXRpYyBpbmxpbmUgc3RydWN0IGJjbTI4MzVfcm5nX3ByaXYgKnRvX3Ju Z19wcml2KHN0cnVjdCBod3JuZyAqcm5nKQpAQCAtOTQsNiArOTYsMTAgQEAgc3RhdGljIGludCBi Y20yODM1X3JuZ19pbml0KHN0cnVjdCBod3JuZyAqcm5nKQogCQkJcmV0dXJuIHJldDsKIAl9CiAK KwlyZXQgPSByZXNldF9jb250cm9sX3Jlc2V0KHByaXYtPnJlc2V0KTsKKwlpZiAocmV0KQorCQly ZXR1cm4gcmV0OworCiAJaWYgKHByaXYtPm1hc2tfaW50ZXJydXB0cykgewogCQkvKiBtYXNrIHRo ZSBpbnRlcnJ1cHQgKi8KIAkJdmFsID0gcm5nX3JlYWRsKHByaXYsIFJOR19JTlRfTUFTSyk7CkBA IC0xNTksNiArMTY1LDEwIEBAIHN0YXRpYyBpbnQgYmNtMjgzNV9ybmdfcHJvYmUoc3RydWN0IHBs YXRmb3JtX2RldmljZSAqcGRldikKIAlpZiAoUFRSX0VSUihwcml2LT5jbGspID09IC1FUFJPQkVf REVGRVIpCiAJCXJldHVybiAtRVBST0JFX0RFRkVSOwogCisJcHJpdi0+cmVzZXQgPSBkZXZtX3Jl c2V0X2NvbnRyb2xfZ2V0X29wdGlvbmFsX2V4Y2x1c2l2ZShkZXYsIE5VTEwpOworCWlmIChJU19F UlIocHJpdi0+cmVzZXQpKQorCQlyZXR1cm4gUFRSX0VSUihwcml2LT5yZXNldCk7CisKIAlwcml2 LT5ybmcubmFtZSA9IHBkZXYtPm5hbWU7CiAJcHJpdi0+cm5nLmluaXQgPSBiY20yODM1X3JuZ19p bml0OwogCXByaXYtPnJuZy5yZWFkID0gYmNtMjgzNV9ybmdfcmVhZDsKLS0gCjIuMjAuMQoKCl9f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCmxpbnV4LWFybS1r ZXJuZWwgbWFpbGluZyBsaXN0CmxpbnV4LWFybS1rZXJuZWxAbGlzdHMuaW5mcmFkZWFkLm9yZwpo dHRwOi8vbGlzdHMuaW5mcmFkZWFkLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2xpbnV4LWFybS1rZXJu ZWwK