add a small driver for AMDs cryptographic co processor.

the hardware provides crypto offload, zlib offload, and an rng.
this code only supports the rng at the moment.

this device is present on their amd seatlle platforms, and very
present on their epyc stuff.

ok kettenis@ jmatthew@

2 files changed, 92 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);
+}
diff --git a/sys/dev/ic/ccpvar.h b/sys/dev/ic/ccpvar.h
new file mode 100644
index 00000000000..237a5d45f5e
--- /dev/null
+++ b/sys/dev/ic/ccpvar.h
@@ -0,0 +1,29 @@
+/*	$OpenBSD: ccpvar.h,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/timeout.h>
+
+struct ccp_softc {
+	struct device		sc_dev;
+	bus_space_tag_t		sc_iot;
+	bus_space_handle_t	sc_ioh;
+
+	struct timeout		sc_tick;
+};
+
+void	ccp_attach(struct ccp_softc *);