[src/trunk]: src/sys/arch/arm/xscale Add support for the i80321 watchdog timer.

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

details:   https://anonhg.NetBSD.org/src/rev/5d7abb749c1e
branches:  trunk
changeset: 534574:5d7abb749c1e
user:      thorpej <thorpej%NetBSD.org@localhost>
date:      Mon Jul 29 18:40:04 2002 +0000

description:
Add support for the i80321 watchdog timer.

diffstat:

 sys/arch/arm/xscale/files.i80321  |    8 +-
 sys/arch/arm/xscale/i80321_wdog.c |  141 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 147 insertions(+), 2 deletions(-)

diffs (165 lines):

diff -r 43f88d5157ae -r 5d7abb749c1e sys/arch/arm/xscale/files.i80321
--- a/sys/arch/arm/xscale/files.i80321  Mon Jul 29 18:26:58 2002 +0000
+++ b/sys/arch/arm/xscale/files.i80321  Mon Jul 29 18:40:04 2002 +0000
@@ -1,4 +1,4 @@
-#      $NetBSD: files.i80321,v 1.4 2002/07/29 17:37:14 thorpej Exp $
+#      $NetBSD: files.i80321,v 1.5 2002/07/29 18:40:04 thorpej Exp $
 #
 # Configuration info for Intel i80321 XScale I/O Processor support
 #
@@ -14,5 +14,9 @@
 file   arch/arm/xscale/i80321_pci.c            iopxs
 file   arch/arm/xscale/i80321_pci_dma.c        iopxs
 file   arch/arm/xscale/i80321_space.c          iopxs
+file   arch/arm/xscale/i80321_local_dma.c      iopxs
 
-file   arch/arm/xscale/i80321_local_dma.c      iopxs
+# Watchdog timer
+device iopwdog: sysmon_wdog
+attach iopwdog at iopxs
+file   arch/arm/xscale/i80321_wdog.c           iopwdog
diff -r 43f88d5157ae -r 5d7abb749c1e sys/arch/arm/xscale/i80321_wdog.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/arm/xscale/i80321_wdog.c Mon Jul 29 18:40:04 2002 +0000
@@ -0,0 +1,141 @@
+/*     $NetBSD: i80321_wdog.c,v 1.1 2002/07/29 18:40:04 thorpej Exp $  */
+
+/*
+ * 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/param.h>
+#include <sys/systm.h>
+#include <sys/device.h>
+#include <sys/wdog.h>
+
+#include <machine/bus.h>
+#include <arm/cpufunc.h>
+
+#include <arm/xscale/i80321reg.h>
+#include <arm/xscale/i80321var.h>
+
+#include <dev/sysmon/sysmonvar.h>
+
+struct iopwdog_softc {
+       struct device sc_dev;
+       struct sysmon_wdog sc_smw;
+       int sc_wdog_armed;
+       int sc_wdog_period;
+};
+
+static __inline void
+wdtcr_write(uint32_t val)
+{
+
+       __asm __volatile("mcr p6, 0, %0, c7, c1, 0"
+               :
+               : "r" (val));
+}
+
+static int
+iopwdog_tickle(struct sysmon_wdog *smw)
+{
+
+       wdtcr_write(WDTCR_ENABLE1);
+       wdtcr_write(WDTCR_ENABLE2);
+       return (0);
+}
+
+static int
+iopwdog_setmode(struct sysmon_wdog *smw)
+{
+       struct iopwdog_softc *sc = smw->smw_cookie;
+
+       if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) {
+               /* The i80321 watchdog can't be disarmed once armed. */
+               if (sc->sc_wdog_armed)
+                       return (EOPNOTSUPP);
+       } else {
+               if (smw->smw_period == WDOG_PERIOD_DEFAULT)
+                       smw->smw_period = sc->sc_wdog_period;
+               else if (smw->smw_period != sc->sc_wdog_period) {
+                       /* Can't change the i80321 watchdog period. */
+                       return (EOPNOTSUPP);
+               }
+               sc->sc_wdog_armed = 1;
+               /* Watchdog is armed by tickling it. */
+               iopwdog_tickle(smw);
+       }
+       return (0);
+}
+
+static int
+iopwdog_match(struct device *parent, struct cfdata *cf, void *aux)
+{
+       struct iopxs_attach_args *ia = aux;
+
+       if (strcmp(cf->cf_driver->cd_name, ia->ia_name) == 0)
+               return (1);
+
+       return (0);
+}
+
+static void
+iopwdog_attach(struct device *parent, struct device *self, void *aux)
+{
+       struct iopwdog_softc *sc = (void *) self;
+
+       /*
+        * XXX Should compute the period based on processor speed.
+        * For a 600MHz XScale core, the wdog must be tickled approx.
+        * every 7 seconds.
+        */
+       sc->sc_wdog_period = 7;
+
+       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 = iopwdog_setmode;
+       sc->sc_smw.smw_tickle = iopwdog_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);
+}
+
+struct cfattach iopwdog_ca = {
+       sizeof(struct iopwdog_softc), iopwdog_match, iopwdog_attach,
+};