126 lines
3.5 KiB
C
126 lines
3.5 KiB
C
/* $NetBSD: rng200.c,v 1.1 2019/09/01 14:44:14 mlelstv Exp $ */
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/*
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* Copyright (c) 2019 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Michael van Elst
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Driver for the Broadcom iProc RNG200
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*/
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/mutex.h>
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#include <sys/rndpool.h>
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#include <sys/rndsource.h>
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#include <dev/ic/rng200var.h>
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#include <dev/ic/rng200reg.h>
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#define READ4(sc, r) \
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bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (r))
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#define WRITE4(sc, r, v) \
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bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (r), (v))
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static void
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rng200_reset(struct rng200_softc *sc)
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{
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uint32_t ctl, rng, rbg;
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/* Disable RBG */
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ctl = READ4(sc, RNG200_CONTROL);
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ctl &= ~RNG200_RBG_MASK;
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WRITE4(sc, RNG200_CONTROL, ctl);
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/* Clear interrupts */
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WRITE4(sc, RNG200_STATUS, 0xffffffff);
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/* Reset RNG and RBG */
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rbg = READ4(sc, RNG200_RBG_RESET);
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rng = READ4(sc, RNG200_RNG_RESET);
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WRITE4(sc, RNG200_RBG_RESET, rbg | RBG_RESET);
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WRITE4(sc, RNG200_RNG_RESET, rng | RNG_RESET);
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WRITE4(sc, RNG200_RNG_RESET, rng);
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WRITE4(sc, RNG200_RBG_RESET, rbg);
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/* Enable RBG */
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WRITE4(sc, RNG200_CONTROL, ctl | RNG200_RBG_ENABLE);
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}
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static void
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rng200_get(size_t bytes_wanted, void *priv)
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{
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struct rng200_softc * const sc = priv;
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uint32_t w, data;
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unsigned count;
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mutex_spin_enter(&sc->sc_lock);
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while (bytes_wanted) {
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w = READ4(sc, RNG200_STATUS);
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if ((w & (RNG200_MASTER_FAIL | RNG200_NIST_FAIL)) != 0)
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rng200_reset(sc);
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w = READ4(sc, RNG200_COUNT);
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count = __SHIFTOUT(w, RNG200_COUNT_MASK);
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if (count == 0)
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break;
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data = READ4(sc, RNG200_DATA);
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rnd_add_data_sync(&sc->sc_rndsource, &data,
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sizeof(data), sizeof(data) * NBBY);
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bytes_wanted -= MIN(bytes_wanted, sizeof(data));
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}
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explicit_memset(&data, 0, sizeof(data));
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mutex_spin_exit(&sc->sc_lock);
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}
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void
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rng200_attach(struct rng200_softc *sc)
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{
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mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_VM);
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rndsource_setcb(&sc->sc_rndsource, rng200_get, sc);
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rnd_attach_source(&sc->sc_rndsource, sc->sc_name,
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RND_TYPE_RNG, RND_FLAG_COLLECT_VALUE|RND_FLAG_HASCB);
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rng200_get(RND_POOLBITS / NBBY, sc);
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}
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void
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rng200_detach(struct rng200_softc *sc)
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{
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rnd_detach_source(&sc->sc_rndsource);
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mutex_destroy(&sc->sc_lock);
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}
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