diff options
Diffstat (limited to 'target/linux/layerscape/patches-5.4/804-crypto-0012-MLK-19053-crypto-caam-RNG4-TRNG-errata.patch')
| -rw-r--r-- | target/linux/layerscape/patches-5.4/804-crypto-0012-MLK-19053-crypto-caam-RNG4-TRNG-errata.patch | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/target/linux/layerscape/patches-5.4/804-crypto-0012-MLK-19053-crypto-caam-RNG4-TRNG-errata.patch b/target/linux/layerscape/patches-5.4/804-crypto-0012-MLK-19053-crypto-caam-RNG4-TRNG-errata.patch new file mode 100644 index 0000000000..52d15b71a6 --- /dev/null +++ b/target/linux/layerscape/patches-5.4/804-crypto-0012-MLK-19053-crypto-caam-RNG4-TRNG-errata.patch @@ -0,0 +1,63 @@ +From e1a89cdf6fa6b04806eb24b939738bb89ab62914 Mon Sep 17 00:00:00 2001 +From: Aymen Sghaier <aymen.sghaier@nxp.com> +Date: Thu, 13 Sep 2018 16:41:03 +0200 +Subject: [PATCH] MLK-19053 crypto: caam - RNG4 TRNG errata +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + + The TRNG as used in RNG4, used in CAAM has a documentation issue. The +effect is that it is possible that the entropy used to instantiate the +DRBG may be old entropy, rather than newly generated entropy. There is +proper programming guidance, but it is not in the documentation. + +Signed-off-by: Aymen Sghaier <aymen.sghaier@nxp.com> +Signed-off-by: Vipul Kumar <vipul_kumar@mentor.com> +(cherry picked from commit ea2b30c8171acf7624e3d44276737c3878ca900d) + +-ported to RNG initialization in ctrl.c +-changed commit headline + +Signed-off-by: Horia Geantă <horia.geanta@nxp.com> +--- + drivers/crypto/caam/ctrl.c | 9 +++++++-- + drivers/crypto/caam/regs.h | 3 ++- + 2 files changed, 9 insertions(+), 3 deletions(-) + +--- a/drivers/crypto/caam/ctrl.c ++++ b/drivers/crypto/caam/ctrl.c +@@ -339,7 +339,11 @@ static void kick_trng(struct platform_de + r4tst = &ctrl->r4tst[0]; + + /* put RNG4 into program mode */ +- clrsetbits_32(&r4tst->rtmctl, 0, RTMCTL_PRGM); ++ /* Setting both RTMCTL:PRGM and RTMCTL:TRNG_ACC causes TRNG to ++ * properly invalidate the entropy in the entropy register and ++ * force re-generation. ++ */ ++ clrsetbits_32(&r4tst->rtmctl, 0, RTMCTL_PRGM | RTMCTL_ACC); + + /* + * Performance-wise, it does not make sense to +@@ -369,7 +373,8 @@ start_rng: + * select raw sampling in both entropy shifter + * and statistical checker; ; put RNG4 into run mode + */ +- clrsetbits_32(&r4tst->rtmctl, RTMCTL_PRGM, RTMCTL_SAMP_MODE_RAW_ES_SC); ++ clrsetbits_32(&r4tst->rtmctl, RTMCTL_PRGM | RTMCTL_ACC, ++ RTMCTL_SAMP_MODE_RAW_ES_SC); + } + + static int caam_get_era_from_hw(struct caam_ctrl __iomem *ctrl) +--- a/drivers/crypto/caam/regs.h ++++ b/drivers/crypto/caam/regs.h +@@ -492,7 +492,8 @@ struct rngtst { + + /* RNG4 TRNG test registers */ + struct rng4tst { +-#define RTMCTL_PRGM 0x00010000 /* 1 -> program mode, 0 -> run mode */ ++#define RTMCTL_ACC BIT(5) /* TRNG access mode */ ++#define RTMCTL_PRGM BIT(16) /* 1 -> program mode, 0 -> run mode */ + #define RTMCTL_SAMP_MODE_VON_NEUMANN_ES_SC 0 /* use von Neumann data in + both entropy shifter and + statistical checker */ |