[src/trunk]: src/sys/arch Add driver for 405gp (and other 4xx?) watchdog timer.

[simonb <simonb%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/c9b94d73a94e
branches:  trunk
changeset: 534679:c9b94d73a94e
user:      simonb <simonb%NetBSD.org@localhost>
date:      Thu Aug 01 23:15:37 2002 +0000

description:
Add driver for 405gp (and other 4xx?) watchdog timer.

diffstat:

 sys/arch/powerpc/ibm4xx/dev/wdog.c |  151 +++++++++++++++++++++++++++++++++++++
 sys/arch/walnut/conf/files.walnut  |    7 +-
 2 files changed, 157 insertions(+), 1 deletions(-)

diffs (176 lines):

diff -r c772170d59ce -r c9b94d73a94e sys/arch/powerpc/ibm4xx/dev/wdog.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/powerpc/ibm4xx/dev/wdog.c        Thu Aug 01 23:15:37 2002 +0000
@@ -0,0 +1,151 @@
+/* $NetBSD: wdog.c,v 1.1 2002/08/01 23:15:37 simonb Exp $ */
+
+/*
+ * Copyright (c) 2002 Wasabi Systems, Inc.
+ * All rights reserved.
+ *
+ * Written by Jason R. Thorpe and Simon Burge 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 IBM 405GP processor.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/device.h>
+#include <sys/properties.h>
+#include <sys/wdog.h>
+
+#include <machine/autoconf.h>
+
+#include <powerpc/spr.h>
+
+#include <dev/sysmon/sysmonvar.h>
+
+static int wdog_match(struct device *, struct cfdata *, void *);
+static void wdog_attach(struct device *, struct device *, void *);
+static int wdog_tickle(struct sysmon_wdog *);
+static int wdog_setmode(struct sysmon_wdog *);
+
+struct wdog_softc {
+       struct device sc_dev;
+       struct sysmon_wdog sc_smw;
+       int sc_wdog_armed;
+       int sc_wdog_period;
+};
+
+struct cfattach wdog_ca = {
+       sizeof(struct wdog_softc), wdog_match, wdog_attach,
+};
+
+static int
+wdog_match(struct device *parent, struct cfdata *cf, void *aux)
+{
+       struct mainbus_attach_args *maa = aux;
+
+       /* match only watchdog devices */
+       if (strcmp(maa->mb_name, cf->cf_driver->cd_name) != 0)
+               return (0);
+
+       return (1);
+}
+
+static void
+wdog_attach(struct device *parent, struct device *self, void *aux)
+{
+       struct wdog_softc *sc = (void *)self;
+       unsigned int processor_freq;
+
+       if (board_info_get("processor-frequency",
+           &processor_freq, sizeof(processor_freq)) == -1)
+               processor_freq = 200 * 1000 * 1000;     /* assume 200MHz */
+
+       sc->sc_wdog_period = (2LL << 29) / processor_freq;
+       printf(": %d second period\n", sc->sc_wdog_period);
+
+       sc->sc_smw.smw_name = sc->sc_dev.dv_xname;
+       sc->sc_smw.smw_cookie = sc;
+       sc->sc_smw.smw_setmode = wdog_setmode;
+       sc->sc_smw.smw_tickle = wdog_tickle;
+       sc->sc_smw.smw_period = sc->sc_wdog_period;
+
+       if (sysmon_wdog_register(&sc->sc_smw) != 0)
+               printf("%s: unable to register with sysmon\n",
+                   sc->sc_dev.dv_xname);
+
+}
+
+static int
+wdog_tickle(struct sysmon_wdog *smw)
+{
+       uint32_t tsr;
+
+       tsr = mfspr(SPR_TSR);
+       tsr |= TSR_ENW | TSR_WIS;
+       mtspr(SPR_TSR, tsr);
+       return (0);
+}
+
+static int
+wdog_setmode(struct sysmon_wdog *smw)
+{
+       struct wdog_softc *sc = smw->smw_cookie;
+       uint32_t tcr, tsr;
+
+       if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) {
+               if (sc->sc_wdog_armed) {
+                       tsr = mfspr(SPR_TSR);
+                       tsr &= ~(TSR_ENW | TSR_WIS);
+                       mtspr(SPR_TSR, tsr);
+               }
+       } else {
+               if (smw->smw_period == WDOG_PERIOD_DEFAULT)
+                       smw->smw_period = sc->sc_wdog_period;
+               else if (smw->smw_period != sc->sc_wdog_period) {
+                       /*
+                        * There's 4 set watchdog periods on the 405GP,
+                        * but we only support the longest one (2.684
+                        * seconds).
+                        */
+                       return (EOPNOTSUPP);
+               }
+               sc->sc_wdog_armed = 1;
+
+               tcr = mfspr(SPR_TCR);
+               tcr |= TCR_WP_2_29 | TCR_WRC_SYSTEM;
+               mtspr(SPR_TCR, tcr);
+
+               /* Arm the watchdog. */
+               wdog_tickle(smw);
+       }
+       return (0);
+}
diff -r c772170d59ce -r c9b94d73a94e sys/arch/walnut/conf/files.walnut
--- a/sys/arch/walnut/conf/files.walnut Thu Aug 01 22:43:34 2002 +0000
+++ b/sys/arch/walnut/conf/files.walnut Thu Aug 01 23:15:37 2002 +0000
@@ -1,4 +1,4 @@
-#      $NetBSD: files.walnut,v 1.6 2002/05/30 15:21:24 eeh Exp $
+#      $NetBSD: files.walnut,v 1.7 2002/08/01 23:15:38 simonb Exp $
 #
 # walnut-specific configuration info
 
@@ -64,6 +64,11 @@
 attach emac at mainbus
 file   arch/powerpc/ibm4xx/dev/if_emac.c       emac
 
+# Watchdog timer
+device wdog: sysmon_wdog
+attach wdog at mainbus
+file   arch/powerpc/ibm4xx/dev/wdog.c          wdog
+
 # PCI bus support
 include        "dev/pci/files.pci"