5543a1b98e
return BUS_PROBE_NOWILDCARD from their probe routines to avoid claiming wildcard devices on their parent bus. Do a sweep through the MIPS tree. MFC after: 2 weeks
133 lines
3.6 KiB
C
133 lines
3.6 KiB
C
/*-
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* Copyright (c) 2010 Juli Mallett <jmallett@FreeBSD.org>
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* All rights reserved.
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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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/clock.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/random.h>
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#include <contrib/octeon-sdk/cvmx.h>
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#include <contrib/octeon-sdk/cvmx-rng.h>
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#define OCTEON_RND_WORDS 2
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struct octeon_rnd_softc {
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uint64_t sc_entropy[OCTEON_RND_WORDS];
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struct callout sc_callout;
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};
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static void octeon_rnd_identify(driver_t *drv, device_t parent);
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static int octeon_rnd_attach(device_t dev);
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static int octeon_rnd_probe(device_t dev);
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static int octeon_rnd_detach(device_t dev);
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static void octeon_rnd_harvest(void *);
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static device_method_t octeon_rnd_methods[] = {
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/* Device interface */
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DEVMETHOD(device_identify, octeon_rnd_identify),
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DEVMETHOD(device_probe, octeon_rnd_probe),
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DEVMETHOD(device_attach, octeon_rnd_attach),
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DEVMETHOD(device_detach, octeon_rnd_detach),
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{ 0, 0 }
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};
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static driver_t octeon_rnd_driver = {
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"rnd",
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octeon_rnd_methods,
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sizeof (struct octeon_rnd_softc)
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};
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static devclass_t octeon_rnd_devclass;
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DRIVER_MODULE(rnd, nexus, octeon_rnd_driver, octeon_rnd_devclass, 0, 0);
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static void
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octeon_rnd_identify(driver_t *drv, device_t parent)
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{
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BUS_ADD_CHILD(parent, 0, "rnd", 0);
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}
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static int
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octeon_rnd_probe(device_t dev)
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{
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if (device_get_unit(dev) != 0)
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return (ENXIO);
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device_set_desc(dev, "Cavium Octeon Random Number Generator");
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return (BUS_PROBE_NOWILDCARD);
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}
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static int
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octeon_rnd_attach(device_t dev)
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{
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struct octeon_rnd_softc *sc;
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sc = device_get_softc(dev);
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callout_init(&sc->sc_callout, CALLOUT_MPSAFE);
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callout_reset(&sc->sc_callout, hz * 5, octeon_rnd_harvest, sc);
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cvmx_rng_enable();
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return (0);
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}
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static int
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octeon_rnd_detach(device_t dev)
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{
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struct octeon_rnd_softc *sc;
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sc = device_get_softc(dev);
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callout_stop(&sc->sc_callout);
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return (0);
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}
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static void
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octeon_rnd_harvest(void *arg)
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{
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struct octeon_rnd_softc *sc;
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unsigned i;
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sc = arg;
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for (i = 0; i < OCTEON_RND_WORDS; i++)
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sc->sc_entropy[i] = cvmx_rng_get_random64();
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random_harvest(sc->sc_entropy, sizeof sc->sc_entropy,
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(sizeof(sc->sc_entropy)*8)/2, RANDOM_PURE_OCTEON);
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callout_reset(&sc->sc_callout, hz * 5, octeon_rnd_harvest, sc);
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}
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