From 4bdb59f3423432e49b968cf5284000e2d7247199 Mon Sep 17 00:00:00 2001
From: Oleksandr Tymoshenko <gonzo@FreeBSD.org>
Date: Thu, 9 Jul 2009 20:16:01 +0000
Subject: [PATCH] - Add AR71XX watchdog timer driver

---
 sys/mips/atheros/ar71xx_wdog.c | 118 +++++++++++++++++++++++++++++++++
 sys/mips/atheros/files.ar71xx  |   1 +
 sys/mips/conf/AR71XX           |   2 +
 sys/mips/conf/AR71XX.hints     |   3 +
 4 files changed, 124 insertions(+)
 create mode 100644 sys/mips/atheros/ar71xx_wdog.c

diff --git a/sys/mips/atheros/ar71xx_wdog.c b/sys/mips/atheros/ar71xx_wdog.c
new file mode 100644
index 000000000000..90caaa84f8af
--- /dev/null
+++ b/sys/mips/atheros/ar71xx_wdog.c
@@ -0,0 +1,118 @@
+/*-
+ * Copyright (c) 2009, Oleksandr Tymoshenko <gonzo@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 unmodified, 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.
+ */
+
+/*
+ * Watchdog driver for AR71xx 
+ */
+
+#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 <mips/atheros/ar71xxreg.h>
+
+struct ar71xx_wdog_softc {
+	device_t dev;
+	int armed;
+};
+
+static void
+ar71xx_wdog_watchdog_fn(void *private, u_int cmd, int *error)
+{
+	struct ar71xx_wdog_softc *sc = private;
+	uint64_t timer_val;
+
+	cmd &= WD_INTERVAL;
+	if (cmd > 0) {
+		timer_val = (uint64_t)(1ULL << cmd) * ar71xx_ahb_freq() /
+		    1000000000;
+		/*
+		 * Load timer with large enough value to prevent spurious
+		 * reset
+		 */
+		ATH_WRITE_REG(AR71XX_RST_WDOG_TIMER, 
+		    ar71xx_ahb_freq() * 10);
+		ATH_WRITE_REG(AR71XX_RST_WDOG_CONTROL, 
+		    RST_WDOG_ACTION_RESET);
+		ATH_WRITE_REG(AR71XX_RST_WDOG_TIMER, 
+		    (timer_val & 0xffffffff));
+		sc->armed = 1;
+		*error = 0;
+	} else {
+		if (sc->armed) {
+			ATH_WRITE_REG(AR71XX_RST_WDOG_CONTROL, 
+			    RST_WDOG_ACTION_NOACTION);
+			sc->armed = 0;
+		}
+	}
+}
+
+static int
+ar71xx_wdog_probe(device_t dev)
+{
+
+	device_set_desc(dev, "Atheros AR71XX watchdog timer");
+	return (0);
+}
+
+static int
+ar71xx_wdog_attach(device_t dev)
+{
+	struct ar71xx_wdog_softc *sc = device_get_softc(dev);
+	
+	if (ATH_READ_REG(AR71XX_RST_WDOG_CONTROL) & RST_WDOG_LAST)
+		device_printf (dev, 
+		    "Previous reset was due to watchdog timeout\n");
+
+	ATH_WRITE_REG(AR71XX_RST_WDOG_CONTROL, RST_WDOG_ACTION_NOACTION);
+
+	sc->dev = dev;
+	EVENTHANDLER_REGISTER(watchdog_list, ar71xx_wdog_watchdog_fn, sc, 0);
+
+	return (0);
+}
+
+static device_method_t ar71xx_wdog_methods[] = {
+	DEVMETHOD(device_probe, ar71xx_wdog_probe),
+	DEVMETHOD(device_attach, ar71xx_wdog_attach),
+	{0, 0},
+};
+
+static driver_t ar71xx_wdog_driver = {
+	"ar71xx_wdog",
+	ar71xx_wdog_methods,
+	sizeof(struct ar71xx_wdog_softc),
+};
+static devclass_t ar71xx_wdog_devclass;
+
+DRIVER_MODULE(ar71xx_wdog, nexus, ar71xx_wdog_driver, ar71xx_wdog_devclass, 0, 0);
diff --git a/sys/mips/atheros/files.ar71xx b/sys/mips/atheros/files.ar71xx
index cb2e00bc05a5..b3db957512e8 100644
--- a/sys/mips/atheros/files.ar71xx
+++ b/sys/mips/atheros/files.ar71xx
@@ -7,6 +7,7 @@ mips/atheros/ar71xx_ohci.c	optional ohci
 mips/atheros/ar71xx_pci.c	optional pci
 mips/atheros/ar71xx_pci_bus_space.c	optional pci
 mips/atheros/ar71xx_spi.c	optional ar71xx_spi
+mips/atheros/ar71xx_wdog.c	optional ar71xx_wdog
 mips/atheros/if_arge.c		optional arge
 mips/atheros/uart_bus_ar71xx.c	optional uart
 mips/atheros/uart_cpu_ar71xx.c	optional uart
diff --git a/sys/mips/conf/AR71XX b/sys/mips/conf/AR71XX
index e06ea43dd024..8e8fff4ae782 100644
--- a/sys/mips/conf/AR71XX
+++ b/sys/mips/conf/AR71XX
@@ -74,6 +74,8 @@ device		ar71xx_spi
 device		mx25l
 # device		geom_redboot
 
+device		ar71xx_wdog
+
 device		uart
 
 device		loop
diff --git a/sys/mips/conf/AR71XX.hints b/sys/mips/conf/AR71XX.hints
index 17026c10a809..2b97880c60cc 100644
--- a/sys/mips/conf/AR71XX.hints
+++ b/sys/mips/conf/AR71XX.hints
@@ -41,3 +41,6 @@ hint.spi.0.msize=0x10
 
 hint.mx25l.0.at="spibus0"
 hint.mx25l.0.cs=0
+
+# Watchdog
+hint.ar71xx_wdog.0.at="nexus0"