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authorcognet <cognet@FreeBSD.org>2005-01-15 16:54:35 +0000
committercognet <cognet@FreeBSD.org>2005-01-15 16:54:35 +0000
commitd96d350b95d6635028e73403c8d68aea8e67d3de (patch)
treec572a9f8db5238fa1bf20403cfdc75d24c8fbe2c /sys/arm/xscale
parente2a9113a2bc2f9d6ae67db7729041b1d81a1cc0c (diff)
downloadFreeBSD-src-d96d350b95d6635028e73403c8d68aea8e67d3de.zip
FreeBSD-src-d96d350b95d6635028e73403c8d68aea8e67d3de.tar.gz
Add a driver for the i80321 watchdog.
Obtained from: NetBSD
Diffstat (limited to 'sys/arm/xscale')
-rw-r--r--sys/arm/xscale/i80321/i80321_wdog.c149
1 files changed, 149 insertions, 0 deletions
diff --git a/sys/arm/xscale/i80321/i80321_wdog.c b/sys/arm/xscale/i80321/i80321_wdog.c
new file mode 100644
index 0000000..c35e8d9
--- /dev/null
+++ b/sys/arm/xscale/i80321/i80321_wdog.c
@@ -0,0 +1,149 @@
+/* $NetBSD: i80321_wdog.c,v 1.6 2003/07/15 00:24:54 lukem Exp $ */
+
+/*
+ * Copyright (c) 2005 Olivier Houchard
+ * Copyright (c) 2002 Wasabi Systems, Inc.
+ * All rights reserved.
+ *
+ * Written by Jason R. Thorpe for Wasabi Systems, Inc.
+ *
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed for the NetBSD Project by
+ * Wasabi Systems, Inc.
+ * 4. The name of Wasabi Systems, Inc. may not be used to endorse
+ * or promote products derived from this software without specific prior
+ * written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
+ * 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.
+ */
+
+/*
+ * Watchdog timer support for the Intel i80321 I/O processor.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/watchdog.h>
+#include <sys/bus.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+
+#include <machine/bus.h>
+#include <machine/cpufunc.h>
+#include <machine/machdep.h>
+
+#include <arm/xscale/i80321/i80321reg.h>
+#include <arm/xscale/i80321/i80321var.h>
+
+
+struct iopwdog_softc {
+ device_t dev;
+ int armed;
+ int wdog_period;
+ struct callout_handle wdog_callout;
+};
+
+static __inline void
+wdtcr_write(uint32_t val)
+{
+
+ __asm __volatile("mcr p6, 0, %0, c7, c1, 0"
+ :
+ : "r" (val));
+}
+
+static void
+iopwdog_tickle(void *arg)
+{
+ struct iopwdog_softc *sc = arg;
+
+ if (!sc->armed)
+ return;
+ wdtcr_write(WDTCR_ENABLE1);
+ wdtcr_write(WDTCR_ENABLE2);
+ sc->wdog_callout = timeout(iopwdog_tickle, sc,
+ hz * (sc->wdog_period - 1));
+}
+
+static int
+iopwdog_probe(device_t dev)
+{
+ struct iopwdog_softc *sc = device_get_softc(dev);
+ char buf[128];
+
+ /*
+ * XXX Should compute the period based on processor speed.
+ * For a 600MHz XScale core, the wdog must be tickled approx.
+ * every 7 seconds.
+ */
+
+ sc->wdog_period = 7;
+ sprintf(buf, "i80321 Watchdog, must be tickled every %d seconds",
+ sc->wdog_period);
+ device_set_desc_copy(dev, buf);
+
+ return (0);
+}
+
+static void
+iopwdog_watchdog_fn(void *private, u_int cmd, int *error)
+{
+ struct iopwdog_softc *sc = private;
+
+ if (cmd == 0)
+ return;
+ if ((((uint64_t)1 << (cmd & WD_INTERVAL))) >
+ (uint64_t)sc->wdog_period * 1000000000)
+ return;
+ sc->armed = 1;
+ iopwdog_tickle(sc);
+ *error = 0;
+}
+
+static int
+iopwdog_attach(device_t dev)
+{
+ struct iopwdog_softc *sc = device_get_softc(dev);
+
+ sc->dev = dev;
+ sc->armed = 0;
+ EVENTHANDLER_REGISTER(watchdog_list, iopwdog_watchdog_fn, sc, 0);
+ return (0);
+}
+
+static device_method_t iopwdog_methods[] = {
+ DEVMETHOD(device_probe, iopwdog_probe),
+ DEVMETHOD(device_attach, iopwdog_attach),
+ {0, 0},
+};
+
+static driver_t iopwdog_driver = {
+ "iopwdog",
+ iopwdog_methods,
+ sizeof(struct iopwdog_softc),
+};
+static devclass_t iopwdog_devclass;
+
+DRIVER_MODULE(iopwdog, iq, iopwdog_driver, iopwdog_devclass, 0, 0);
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