svn commit: r208933 - user/jmallett/octeon/sys/mips/cavium

[Juli Mallett]

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 at 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);
+}