diff options
Diffstat (limited to 'board/cr50/dcrypto/trng.c')
| -rw-r--r-- | board/cr50/dcrypto/trng.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/board/cr50/dcrypto/trng.c b/board/cr50/dcrypto/trng.c index ce49527472..5745ec308f 100644 --- a/board/cr50/dcrypto/trng.c +++ b/board/cr50/dcrypto/trng.c @@ -154,6 +154,7 @@ uint64_t read_rand(void) #include "console.h" #include "endian.h" #include "extension.h" +#include "timer.h" #include "watchdog.h" #if CRYPTO_TEST_CMD_RAND @@ -291,6 +292,7 @@ static bool raw_rand_bytes(void *buffer, size_t len) * ========================================================================= * text_len | 2 | the number of random bytes to generate, big endian * type | 1 | 0 - TRNG, 1 = FIPS TRNG, 2 = FIPS DRBG + * | | 3 - TRNG after restart * | | other values reserved for extensions */ static enum vendor_cmd_rc trng_test(enum vendor_cmd_cc code, void *buf, @@ -314,6 +316,13 @@ static enum vendor_cmd_rc trng_test(enum vendor_cmd_cc code, void *buf, } switch (op_type) { + case 3: + /* Power down LDO, wait 1ms, power up. */ + GWRITE(TRNG, POWER_DOWN_B, 0); + udelay(1000); + GWRITE(TRNG, POWER_DOWN_B, 1); + GWRITE(TRNG, GO_EVENT, 1); + /* Fall through */ case 0: if (!raw_rand_bytes(buf, text_len)) return VENDOR_RC_INTERNAL_ERROR; |