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CR50: enable dcrypto random stalls

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Clean up a lingering TODO; enable random
stalls (NOPs) at ~6% for crypto operations.

BRANCH=none
BUG=none
TEST=TCG tests pass

Change-Id: I46b2755d9f501eb4ec98c3184d1e14fbf118c718
Signed-off-by: nagendra modadugu <ngm@google.com>
Reviewed-on: https://chromium-review.googlesource.com/501349
Commit-Ready: Nagendra Modadugu <ngm@google.com>
Tested-by: Nagendra Modadugu <ngm@google.com>
Reviewed-by: Marius Schilder <mschilder@chromium.org>
Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-by: Paul Scheidt <pscheidt@google.com>
This commit is contained in:
nagendra modadugu
2017-05-09 18:23:49 -07:00
committed by chrome-bot
parent 4ecdf78793
commit 70f2088b41
1 changed files with 6 additions and 3 deletions
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9
chip/g/dcrypto/dcrypto_runtime.c
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@@ -30,9 +30,12 @@ void dcrypto_init(void)
REG_WRITE_MLV(GR_PMU_RST0, GC_PMU_RST0_DCRYPTO0_MASK,
GC_PMU_RST0_DCRYPTO0_LSB, 0);
/* Turn off random nops (for accurate measuring here). */
/* TODO(ngm): enable for production. */
GREG32(CRYPTO, RAND_STALL_CTL) = 0;
/* Turn off random nops (which are enabled by default). */
GWRITE_FIELD(CRYPTO, RAND_STALL_CTL, STALL_EN, 0);
/* Configure random nop percentage at 6%. */
GWRITE_FIELD(CRYPTO, RAND_STALL_CTL, FREQ, 3);
/* Now turn on random nops. */
GWRITE_FIELD(CRYPTO, RAND_STALL_CTL, STALL_EN, 1);
/* Initialize DMEM. */
ptr = GREG32_ADDR(CRYPTO, DMEM_DUMMY);