Date: Wed, 9 Jun 2010 05:06:43 +0000 (UTC) From: Juli Mallett <jmallett@FreeBSD.org> To: src-committers@freebsd.org, svn-src-user@freebsd.org Subject: svn commit: r208933 - user/jmallett/octeon/sys/mips/cavium Message-ID: <201006090506.o5956h2h019979@svn.freebsd.org>
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Author: jmallett Date: Wed Jun 9 05:06:42 2010 New Revision: 208933 URL: http://svn.freebsd.org/changeset/base/208933 Log: Add a trivial driver for the Octeon RNG. Added: user/jmallett/octeon/sys/mips/cavium/octeon_rnd.c Modified: user/jmallett/octeon/sys/mips/cavium/files.octeon1 Modified: user/jmallett/octeon/sys/mips/cavium/files.octeon1 ============================================================================== --- user/jmallett/octeon/sys/mips/cavium/files.octeon1 Wed Jun 9 02:07:51 2010 (r208932) +++ user/jmallett/octeon/sys/mips/cavium/files.octeon1 Wed Jun 9 05:06:42 2010 (r208933) @@ -15,6 +15,8 @@ mips/cavium/uart_dev_oct16550.c option mips/mips/intr_machdep.c standard mips/mips/tick.c standard +mips/cavium/octeon_rnd.c optional random + mips/cavium/octe/ethernet.c optional octe mips/cavium/octe/ethernet-common.c optional octe mips/cavium/octe/ethernet-mdio.c optional octe Added: user/jmallett/octeon/sys/mips/cavium/octeon_rnd.c ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ user/jmallett/octeon/sys/mips/cavium/octeon_rnd.c Wed Jun 9 05:06:42 2010 (r208933) @@ -0,0 +1,137 @@ +/*- + * Copyright (c) 2010 Juli Mallett <jmallett@FreeBSD.org> + * All rights reserved. + * + * 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 AUTHOR 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 AUTHOR 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. + * + * $FreeBSD$ + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/bus.h> +#include <sys/clock.h> +#include <sys/kernel.h> +#include <sys/lock.h> +#include <sys/module.h> +#include <sys/random.h> + +#include <contrib/octeon-sdk/cvmx.h> +#include <contrib/octeon-sdk/cvmx-rng.h> + +/* + * XXX + * random_harvest(9) says to call it with no more than 16 bytes, but at least + * safe(4) seems to violate that rule. + */ +#define OCTEON_RND_WORDS 2 + +struct octeon_rnd_softc { + uint64_t sc_entropy[OCTEON_RND_WORDS]; + struct callout sc_callout; +}; + +static void octeon_rnd_identify(driver_t *drv, device_t parent); +static int octeon_rnd_attach(device_t dev); +static int octeon_rnd_probe(device_t dev); +static int octeon_rnd_detach(device_t dev); + +static void octeon_rnd_harvest(void *); + +static device_method_t octeon_rnd_methods[] = { + /* Device interface */ + DEVMETHOD(device_identify, octeon_rnd_identify), + DEVMETHOD(device_probe, octeon_rnd_probe), + DEVMETHOD(device_attach, octeon_rnd_attach), + DEVMETHOD(device_detach, octeon_rnd_detach), + + { 0, 0 } +}; + +static driver_t octeon_rnd_driver = { + "rnd", + octeon_rnd_methods, + sizeof (struct octeon_rnd_softc) +}; +static devclass_t octeon_rnd_devclass; +DRIVER_MODULE(rnd, nexus, octeon_rnd_driver, octeon_rnd_devclass, 0, 0); + +static void +octeon_rnd_identify(driver_t *drv, device_t parent) +{ + BUS_ADD_CHILD(parent, 0, "rnd", 0); +} + +static int +octeon_rnd_probe(device_t dev) +{ + if (device_get_unit(dev) != 0) + return (ENXIO); + + device_set_desc(dev, "Cavium Octeon Random Number Generator"); + return (0); +} + +static int +octeon_rnd_attach(device_t dev) +{ + struct octeon_rnd_softc *sc; + + sc = device_get_softc(dev); + callout_init(&sc->sc_callout, CALLOUT_MPSAFE); + callout_reset(&sc->sc_callout, hz * 5, octeon_rnd_harvest, sc); + + cvmx_rng_enable(); + + return (0); +} + +static int +octeon_rnd_detach(device_t dev) +{ + struct octeon_rnd_softc *sc; + + sc = device_get_softc(dev); + + callout_stop(&sc->sc_callout); + + return (0); +} + +static void +octeon_rnd_harvest(void *arg) +{ + struct octeon_rnd_softc *sc; + unsigned i; + + sc = arg; + + for (i = 0; i < OCTEON_RND_WORDS; i++) + sc->sc_entropy[i] = cvmx_rng_get_random64(); + random_harvest(sc->sc_entropy, sizeof sc->sc_entropy, + sizeof sc->sc_entropy * 8, 0, RANDOM_PURE); + + callout_reset(&sc->sc_callout, hz * 5, octeon_rnd_harvest, sc); +}
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