2020-04-10 02:47:05 +00:00
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From e1a89cdf6fa6b04806eb24b939738bb89ab62914 Mon Sep 17 00:00:00 2001
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From: Aymen Sghaier <aymen.sghaier@nxp.com>
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Date: Thu, 13 Sep 2018 16:41:03 +0200
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Subject: [PATCH] MLK-19053 crypto: caam - RNG4 TRNG errata
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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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The TRNG as used in RNG4, used in CAAM has a documentation issue. The
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effect is that it is possible that the entropy used to instantiate the
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DRBG may be old entropy, rather than newly generated entropy. There is
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proper programming guidance, but it is not in the documentation.
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Signed-off-by: Aymen Sghaier <aymen.sghaier@nxp.com>
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Signed-off-by: Vipul Kumar <vipul_kumar@mentor.com>
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(cherry picked from commit ea2b30c8171acf7624e3d44276737c3878ca900d)
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-ported to RNG initialization in ctrl.c
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-changed commit headline
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Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
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---
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drivers/crypto/caam/ctrl.c | 9 +++++++--
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drivers/crypto/caam/regs.h | 3 ++-
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2 files changed, 9 insertions(+), 3 deletions(-)
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--- a/drivers/crypto/caam/ctrl.c
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+++ b/drivers/crypto/caam/ctrl.c
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@@ -339,7 +339,11 @@ static void kick_trng(struct platform_de
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r4tst = &ctrl->r4tst[0];
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/* put RNG4 into program mode */
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- clrsetbits_32(&r4tst->rtmctl, 0, RTMCTL_PRGM);
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+ /* Setting both RTMCTL:PRGM and RTMCTL:TRNG_ACC causes TRNG to
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+ * properly invalidate the entropy in the entropy register and
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+ * force re-generation.
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+ */
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+ clrsetbits_32(&r4tst->rtmctl, 0, RTMCTL_PRGM | RTMCTL_ACC);
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/*
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* Performance-wise, it does not make sense to
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@@ -369,7 +373,8 @@ start_rng:
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* select raw sampling in both entropy shifter
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* and statistical checker; ; put RNG4 into run mode
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*/
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- clrsetbits_32(&r4tst->rtmctl, RTMCTL_PRGM, RTMCTL_SAMP_MODE_RAW_ES_SC);
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+ clrsetbits_32(&r4tst->rtmctl, RTMCTL_PRGM | RTMCTL_ACC,
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+ RTMCTL_SAMP_MODE_RAW_ES_SC);
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}
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static int caam_get_era_from_hw(struct caam_ctrl __iomem *ctrl)
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--- a/drivers/crypto/caam/regs.h
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+++ b/drivers/crypto/caam/regs.h
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2021-12-05 16:43:36 +00:00
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@@ -495,7 +495,8 @@ struct rngtst {
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2020-04-10 02:47:05 +00:00
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/* RNG4 TRNG test registers */
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struct rng4tst {
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-#define RTMCTL_PRGM 0x00010000 /* 1 -> program mode, 0 -> run mode */
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+#define RTMCTL_ACC BIT(5) /* TRNG access mode */
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+#define RTMCTL_PRGM BIT(16) /* 1 -> program mode, 0 -> run mode */
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#define RTMCTL_SAMP_MODE_VON_NEUMANN_ES_SC 0 /* use von Neumann data in
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both entropy shifter and
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statistical checker */
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