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path: root/drivers/crypto/caam/caamrng.c
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Diffstat (limited to 'drivers/crypto/caam/caamrng.c')
-rw-r--r--drivers/crypto/caam/caamrng.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/drivers/crypto/caam/caamrng.c b/drivers/crypto/caam/caamrng.c
index 50eb55da45c2..b3d14a7f4dd1 100644
--- a/drivers/crypto/caam/caamrng.c
+++ b/drivers/crypto/caam/caamrng.c
@@ -172,6 +172,50 @@ static void caam_cleanup(struct hwrng *rng)
kfifo_free(&ctx->fifo);
}
+#ifdef CONFIG_CRYPTO_DEV_FSL_CAAM_RNG_TEST
+static inline void test_len(struct hwrng *rng, size_t len, bool wait)
+{
+ u8 *buf;
+ int read_len;
+ struct caam_rng_ctx *ctx = to_caam_rng_ctx(rng);
+ struct device *dev = ctx->ctrldev;
+
+ buf = kcalloc(CAAM_RNG_MAX_FIFO_STORE_SIZE, sizeof(u8), GFP_KERNEL);
+
+ while (len > 0) {
+ read_len = rng->read(rng, buf, len, wait);
+
+ if (read_len < 0 || (read_len == 0 && wait)) {
+ dev_err(dev, "RNG Read FAILED received %d bytes\n",
+ read_len);
+ kfree(buf);
+ return;
+ }
+
+ print_hex_dump_debug("random bytes@: ",
+ DUMP_PREFIX_ADDRESS, 16, 4,
+ buf, read_len, 1);
+
+ len = len - read_len;
+ }
+
+ kfree(buf);
+}
+
+static inline void test_mode_once(struct hwrng *rng, bool wait)
+{
+ test_len(rng, 32, wait);
+ test_len(rng, 64, wait);
+ test_len(rng, 128, wait);
+}
+
+static void self_test(struct hwrng *rng)
+{
+ pr_info("Executing RNG SELF-TEST with wait\n");
+ test_mode_once(rng, true);
+}
+#endif
+
static int caam_init(struct hwrng *rng)
{
struct caam_rng_ctx *ctx = to_caam_rng_ctx(rng);
@@ -258,6 +302,10 @@ int caam_rng_init(struct device *ctrldev)
return ret;
}
+#ifdef CONFIG_CRYPTO_DEV_FSL_CAAM_RNG_TEST
+ self_test(&ctx->rng);
+#endif
+
devres_close_group(ctrldev, caam_rng_init);
return 0;
}