1 files changed, 63 insertions, 0 deletions
diff --git a/sys/dev/ic/ccp.c b/sys/dev/ic/ccp.c
new file mode 100644
index 00000000000..76bce67d254
--- /dev/null
+++ b/sys/dev/ic/ccp.c
@@ -0,0 +1,63 @@
+/*	$OpenBSD: ccp.c,v 1.1 2018/04/20 04:37:21 dlg Exp $ */
+
+/*
+ * Copyright (c) 2018 David Gwynne <dlg@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/buf.h>
+#include <sys/device.h>
+#include <sys/malloc.h>
+#include <sys/kernel.h>
+#include <sys/timeout.h>
+
+#include <machine/bus.h>
+
+#include <dev/rndvar.h>
+
+#include <dev/ic/ccpvar.h>
+
+#define CCP_REG_TRNG		0xc
+
+static void	ccp_rng(void *);
+
+struct cfdriver ccp_cd = {
+	NULL,
+	"ccp",
+	DV_DULL
+};
+
+void
+ccp_attach(struct ccp_softc *sc)
+{
+	timeout_set(&sc->sc_tick, ccp_rng, sc);
+	ccp_rng(sc);
+
+	printf("\n");
+}
+
+static void
+ccp_rng(void *arg)
+{
+	struct ccp_softc *sc = arg;
+	uint32_t trng;
+
+	trng = bus_space_read_4(sc->sc_iot, sc->sc_ioh, CCP_REG_TRNG);
+	if (trng != 0)
+		add_true_randomness(trng);
+
+	timeout_add_msec(&sc->sc_tick, 100);
+}