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[src/trunk]: src/sys/dev/ic Driver for Broadcom RNG200 hardware random generator
details: https://anonhg.NetBSD.org/src/rev/e1084df61938
branches: trunk
changeset: 459229:e1084df61938
user: mlelstv <mlelstv%NetBSD.org@localhost>
date: Sun Sep 01 14:44:14 2019 +0000
description:
Driver for Broadcom RNG200 hardware random generator
diffstat:
sys/dev/ic/rng200.c | 125 +++++++++++++++++++++++++++++++++++++++++++++++++
sys/dev/ic/rng200reg.h | 54 +++++++++++++++++++++
sys/dev/ic/rng200var.h | 52 ++++++++++++++++++++
3 files changed, 231 insertions(+), 0 deletions(-)
diffs (243 lines):
diff -r f09c2199098c -r e1084df61938 sys/dev/ic/rng200.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/ic/rng200.c Sun Sep 01 14:44:14 2019 +0000
@@ -0,0 +1,125 @@
+/* $NetBSD: rng200.c,v 1.1 2019/09/01 14:44:14 mlelstv Exp $ */
+
+/*
+ * Copyright (c) 2019 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Michael van Elst
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * Driver for the Broadcom iProc RNG200
+ */
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/mutex.h>
+#include <sys/rndpool.h>
+#include <sys/rndsource.h>
+
+#include <dev/ic/rng200var.h>
+#include <dev/ic/rng200reg.h>
+
+#define READ4(sc, r) \
+ bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (r))
+
+#define WRITE4(sc, r, v) \
+ bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (r), (v))
+
+static void
+rng200_reset(struct rng200_softc *sc)
+{
+ uint32_t ctl, rng, rbg;
+
+ /* Disable RBG */
+ ctl = READ4(sc, RNG200_CONTROL);
+ ctl &= ~RNG200_RBG_MASK;
+ WRITE4(sc, RNG200_CONTROL, ctl);
+
+ /* Clear interrupts */
+ WRITE4(sc, RNG200_STATUS, 0xffffffff);
+
+ /* Reset RNG and RBG */
+ rbg = READ4(sc, RNG200_RBG_RESET);
+ rng = READ4(sc, RNG200_RNG_RESET);
+ WRITE4(sc, RNG200_RBG_RESET, rbg | RBG_RESET);
+ WRITE4(sc, RNG200_RNG_RESET, rng | RNG_RESET);
+ WRITE4(sc, RNG200_RNG_RESET, rng);
+ WRITE4(sc, RNG200_RBG_RESET, rbg);
+
+ /* Enable RBG */
+ WRITE4(sc, RNG200_CONTROL, ctl | RNG200_RBG_ENABLE);
+}
+
+static void
+rng200_get(size_t bytes_wanted, void *priv)
+{
+ struct rng200_softc * const sc = priv;
+ uint32_t w, data;
+ unsigned count;
+
+ mutex_spin_enter(&sc->sc_lock);
+ while (bytes_wanted) {
+
+ w = READ4(sc, RNG200_STATUS);
+ if ((w & (RNG200_MASTER_FAIL | RNG200_NIST_FAIL)) != 0)
+ rng200_reset(sc);
+
+ w = READ4(sc, RNG200_COUNT);
+ count = __SHIFTOUT(w, RNG200_COUNT_MASK);
+
+ if (count == 0)
+ break;
+
+ data = READ4(sc, RNG200_DATA);
+ rnd_add_data_sync(&sc->sc_rndsource, &data,
+ sizeof(data), sizeof(data) * NBBY);
+ bytes_wanted -= MIN(bytes_wanted, sizeof(data));
+ }
+ explicit_memset(&data, 0, sizeof(data));
+ mutex_spin_exit(&sc->sc_lock);
+}
+
+void
+rng200_attach(struct rng200_softc *sc)
+{
+
+ mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_VM);
+
+ rndsource_setcb(&sc->sc_rndsource, rng200_get, sc);
+ rnd_attach_source(&sc->sc_rndsource, sc->sc_name,
+ RND_TYPE_RNG, RND_FLAG_COLLECT_VALUE|RND_FLAG_HASCB);
+
+ rng200_get(RND_POOLBITS / NBBY, sc);
+}
+
+void
+rng200_detach(struct rng200_softc *sc)
+{
+
+ rnd_detach_source(&sc->sc_rndsource);
+ mutex_destroy(&sc->sc_lock);
+}
+
diff -r f09c2199098c -r e1084df61938 sys/dev/ic/rng200reg.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/ic/rng200reg.h Sun Sep 01 14:44:14 2019 +0000
@@ -0,0 +1,54 @@
+/* $NetBSD: rng200reg.h,v 1.1 2019/09/01 14:44:14 mlelstv Exp $ */
+
+/*
+ * Copyright (c) 2019 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Michael van Elst
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _IC_RNG200REG_H_
+#define _IC_RNG200REG_H_
+
+#include <sys/cdefs.h>
+
+/*
+ * registers
+ */
+#define RNG200_CONTROL 0x00
+#define RNG200_RBG_MASK __BITS(0,12)
+#define RNG200_RBG_ENABLE __BIT(1)
+#define RNG200_RNG_RESET 0x04
+#define RNG_RESET 0x00000001
+#define RNG200_RBG_RESET 0x08
+#define RBG_RESET 0x00000001
+#define RNG200_STATUS 0x18
+#define RNG200_MASTER_FAIL __BIT(31)
+#define RNG200_NIST_FAIL __BIT(5)
+#define RNG200_DATA 0x20
+#define RNG200_COUNT 0x24
+#define RNG200_COUNT_MASK __BITS(0,7)
+
+#endif /* !_IC_RNG200REG_H_ */
diff -r f09c2199098c -r e1084df61938 sys/dev/ic/rng200var.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/ic/rng200var.h Sun Sep 01 14:44:14 2019 +0000
@@ -0,0 +1,52 @@
+/* $NetBSD: rng200var.h,v 1.1 2019/09/01 14:44:14 mlelstv Exp $ */
+
+/*
+ * Copyright (c) 2019 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Michael van Elst
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _IC_RNG200VAR_H_
+#define _IC_RNG200VAR_H_
+
+#include <sys/bus.h>
+#include <sys/device.h>
+#include <sys/mutex.h>
+#include <sys/rndsource.h>
+
+struct rng200_softc {
+ bus_space_tag_t sc_bst;
+ bus_space_handle_t sc_bsh;
+
+ kmutex_t sc_lock;
+ krndsource_t sc_rndsource;
+ const char *sc_name;
+};
+
+void rng200_attach(struct rng200_softc *);
+void rng200_detach(struct rng200_softc *);
+
+#endif /* !_IC_RNG200VAR_H_ */
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