svn commit: r353647 - in head: share/man/man4 sys/amd64/conf sys/conf sys/dev/itwd sys/i386/conf sys/modules/itwd
Andriy Gapon
avg at FreeBSD.org
Wed Oct 16 14:57:40 UTC 2019
Author: avg
Date: Wed Oct 16 14:57:38 2019
New Revision: 353647
URL: https://svnweb.freebsd.org/changeset/base/353647
Log:
itwd(4): driver for watchdog function in ITE Super I/O chips
The chips are commonly named with "IT" prefix.
MFC after: 19 days
Added:
head/share/man/man4/itwd.4 (contents, props changed)
head/sys/dev/itwd/
head/sys/dev/itwd/itwd.c (contents, props changed)
head/sys/modules/itwd/
head/sys/modules/itwd/Makefile (contents, props changed)
Modified:
head/share/man/man4/Makefile
head/sys/amd64/conf/NOTES
head/sys/conf/files.x86
head/sys/i386/conf/NOTES
Modified: head/share/man/man4/Makefile
==============================================================================
--- head/share/man/man4/Makefile Wed Oct 16 14:55:56 2019 (r353646)
+++ head/share/man/man4/Makefile Wed Oct 16 14:57:38 2019 (r353647)
@@ -227,6 +227,7 @@ MAN= aac.4 \
ismt.4 \
isp.4 \
ispfw.4 \
+ ${_itwd.4} \
iwi.4 \
iwifw.4 \
iwm.4 \
@@ -791,6 +792,7 @@ _if_wpi.4= if_wpi.4
_imcsmb.4= imcsmb.4
_ipmi.4= ipmi.4
_io.4= io.4
+_itwd.4= itwd.4
_linux.4= linux.4
_nda.4= nda.4
_ndis.4= ndis.4
Added: head/share/man/man4/itwd.4
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/share/man/man4/itwd.4 Wed Oct 16 14:57:38 2019 (r353647)
@@ -0,0 +1,75 @@
+.\"
+.\" SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+.\"
+.\" Copyright (c) 2012 Bjoern A. Zeeb <bz at FreeBSD.org>
+.\" Copyright (c) 2019 Andriy Gapon <avg at FreeBSD.org>
+.\"
+.\" 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.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd October 16, 2019
+.Dt ITWD 4
+.Os
+.Sh NAME
+.Nm itwd
+.Nd device driver for ITE Super I/O chips watchdog timer
+.Sh SYNOPSIS
+To compile this driver into the kernel, place the following lines in your
+kernel configuration file:
+.Bd -ragged -offset indent
+.Cd "device superio"
+.Cd "device itwd"
+.Ed
+.Pp
+Alternatively, to load the driver as a module at boot time, place the following
+line in
+.Xr loader.conf 5 :
+.Bd -literal -offset indent
+itwd_load="YES"
+.Ed
+.Sh DESCRIPTION
+The
+.Nm
+driver provides
+.Xr watchdog 4
+support for the watchdog timer present on at least the following
+Super I/O chips:
+.Bl -bullet -compact
+.It
+IT8721F
+.It
+IT8728F
+.It
+IT8771F
+.El
+.Sh SEE ALSO
+.Xr superio 4
+.Xr watchdog 4 ,
+.Xr device.hints 5 ,
+.Xr watchdog 8 ,
+.Xr watchdogd 8 ,
+.Xr watchdog 9
+.Sh AUTHORS
+.An -nosplit
+This manual page was written by
+.An Andriy Gapon Aq Mt avg at FreeBSD.org .
Modified: head/sys/amd64/conf/NOTES
==============================================================================
--- head/sys/amd64/conf/NOTES Wed Oct 16 14:55:56 2019 (r353646)
+++ head/sys/amd64/conf/NOTES Wed Oct 16 14:57:38 2019 (r353647)
@@ -550,11 +550,13 @@ device ioat # Intel I/OAT DMA engine
# amdsbwd: AMD SB7xx watchdog timer
# viawd: VIA south bridge watchdog timer
# wbwd: Winbond watchdog timer
+# itwd: ITE Super I/O watchdog timer
#
device ichwd
device amdsbwd
device viawd
device wbwd
+device itwd
#
# Temperature sensors:
Modified: head/sys/conf/files.x86
==============================================================================
--- head/sys/conf/files.x86 Wed Oct 16 14:55:56 2019 (r353646)
+++ head/sys/conf/files.x86 Wed Oct 16 14:57:38 2019 (r353647)
@@ -252,6 +252,7 @@ dev/isci/scil/scif_sas_task_request.c optional isci
dev/isci/scil/scif_sas_task_request_state_handlers.c optional isci
dev/isci/scil/scif_sas_task_request_states.c optional isci
dev/isci/scil/scif_sas_timer.c optional isci
+dev/itwd/itwd.c optional itwd
libkern/x86/crc32_sse42.c standard
#
# x86 shared code between IA32 and AMD64 architectures
Added: head/sys/dev/itwd/itwd.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/dev/itwd/itwd.c Wed Oct 16 14:57:38 2019 (r353647)
@@ -0,0 +1,236 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2019 Andriy Gapon
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/bus.h>
+#include <sys/eventhandler.h>
+#include <sys/module.h>
+#include <sys/rman.h>
+#include <sys/systm.h>
+#include <sys/watchdog.h>
+
+#include <dev/superio/superio.h>
+
+#include <machine/bus.h>
+#include <machine/resource.h>
+
+
+struct itwd_softc {
+ eventhandler_tag wd_ev;
+ void *intr_handle;
+ struct resource *intr_res;
+ int intr_rid;
+};
+
+static void
+wd_func(void *priv, u_int cmd, int *error)
+{
+ device_t dev = priv;
+ uint64_t timeout;
+ uint8_t val;
+
+
+ if (cmd != 0) {
+ cmd &= WD_INTERVAL;
+
+ /*
+ * Convert the requested timeout to seconds.
+ * If the timeout is smaller than the minimal supported value
+ * then set it to the minimum.
+ * TODO This hardware actually supports 64ms resolution
+ * when bit 5 of 0x72 is set. Switch to that resolution when
+ * needed.
+ */
+ if (cmd >= WD_TO_1SEC)
+ timeout = (uint64_t)1 << (cmd - WD_TO_1SEC);
+ else
+ timeout = 1;
+
+ /* TODO If timeout is greater than maximum value
+ * that can be specified in seconds, we should
+ * switch the timer to minutes mode by clearing
+ * bit 7 of 0x72 (ensure that bit 5 is also cleared).
+ *
+ * For now, just disable the timer to honor the
+ * watchdog(9) protocol.
+ *
+ * XXX The timeout actually can be up to 65535 units
+ * as it is set via two registers 0x73, LSB, and 0x74,
+ * MSB. But it is not clear what the protocol for writing
+ * those two registers is.
+ */
+ if (timeout <= UINT8_MAX) {
+ val = timeout;
+ *error = 0;
+ } else {
+ /* error left unchanged */
+ val = 0;
+ }
+ } else {
+ val = 0;
+ }
+#ifdef DIAGNOSTIC
+ if (bootverbose)
+ device_printf(dev, "setting timeout to %d\n", val);
+#endif
+ superio_write(dev, 0x73, val);
+ if (superio_read(dev, 0x73) != val)
+ superio_write(dev, 0x73, val);
+}
+
+static void
+itwd_intr(void *cookie)
+{
+ device_t dev = cookie;
+ uint8_t val;
+
+ val = superio_read(dev, 0x71);
+ if (bootverbose)
+ device_printf(dev, "got interrupt, wdt status = %d\n", val & 1);
+ superio_write(dev, 0x71, val & ~((uint8_t)0x01));
+}
+
+static int
+itwd_probe(device_t dev)
+{
+
+ if (superio_vendor(dev) != SUPERIO_VENDOR_ITE)
+ return (ENXIO);
+ if (superio_get_type(dev) != SUPERIO_DEV_WDT)
+ return (ENXIO);
+ device_set_desc(dev, "Watchdog Timer on ITE SuperIO");
+ return (BUS_PROBE_DEFAULT);
+}
+
+static int
+itwd_attach(device_t dev)
+{
+ struct itwd_softc *sc = device_get_softc(dev);
+ int irq = 0;
+ int nmi = 0;
+ int error;
+
+ /* First, reset the timeout, just in case. */
+ superio_write(dev, 0x74, 0);
+ superio_write(dev, 0x73, 0);
+
+ TUNABLE_INT_FETCH("dev.itwd.irq", &irq);
+ TUNABLE_INT_FETCH("dev.itwd.nmi", &nmi);
+ if (irq < 0 || irq > 15) {
+ device_printf(dev, "Ignoring invalid IRQ value %d\n", irq);
+ irq = 0;
+ }
+ if (irq == 0 && nmi) {
+ device_printf(dev, "Ignoring NMI mode if IRQ is not set\n");
+ nmi = 0;
+ }
+
+ /*
+ * NB: if the interrupt has been configured for the NMI delivery,
+ * then it is not available for the regular interrupt allocation.
+ * Thus, we configure the hardware to generate the interrupt,
+ * but do not attempt to allocate and setup it as a regular
+ * interrupt.
+ */
+ if (irq != 0 && !nmi) {
+ sc->intr_rid = 0;
+ bus_set_resource(dev, SYS_RES_IRQ, sc->intr_rid, irq, 1);
+
+ sc->intr_res = bus_alloc_resource_any(dev, SYS_RES_IRQ,
+ &sc->intr_rid, RF_ACTIVE);
+ if (sc->intr_res == NULL) {
+ device_printf(dev, "unable to map interrupt\n");
+ return (ENXIO);
+ }
+ error = bus_setup_intr(dev, sc->intr_res,
+ INTR_TYPE_MISC | INTR_MPSAFE, NULL, itwd_intr, dev,
+ &sc->intr_handle);
+ if (error != 0) {
+ bus_release_resource(dev, SYS_RES_IRQ,
+ sc->intr_rid, sc->intr_res);
+ device_printf(dev, "Unable to setup irq: error %d\n",
+ error);
+ return (ENXIO);
+ }
+ }
+ if (irq != 0) {
+ device_printf(dev, "Using IRQ%d to signal timeout\n", irq);
+ } else {
+ /* System reset via KBRST. */
+ irq = 0x40;
+ device_printf(dev, "Configured for system reset on timeout\n");
+ }
+
+ superio_write(dev, 0x71, 0);
+ superio_write(dev, 0x72, 0x80 | (uint8_t)irq);
+
+ sc->wd_ev = EVENTHANDLER_REGISTER(watchdog_list, wd_func, dev, 0);
+ return (0);
+}
+
+static int
+itwd_detach(device_t dev)
+{
+ struct itwd_softc *sc = device_get_softc(dev);
+ int dummy;
+
+ if (sc->wd_ev != NULL)
+ EVENTHANDLER_DEREGISTER(watchdog_list, sc->wd_ev);
+ wd_func(dev, 0, &dummy);
+ if (sc->intr_handle)
+ bus_teardown_intr(dev, sc->intr_res, sc->intr_handle);
+ if (sc->intr_res)
+ bus_release_resource(dev, SYS_RES_IRQ, sc->intr_rid,
+ sc->intr_res);
+ return (0);
+}
+
+static device_method_t itwd_methods[] = {
+ /* Methods from the device interface */
+ DEVMETHOD(device_probe, itwd_probe),
+ DEVMETHOD(device_attach, itwd_attach),
+ DEVMETHOD(device_detach, itwd_detach),
+
+ /* Terminate method list */
+ { 0, 0 }
+};
+
+static driver_t itwd_driver = {
+ "itwd",
+ itwd_methods,
+ sizeof (struct itwd_softc)
+};
+
+static devclass_t itwd_devclass;
+
+DRIVER_MODULE(itwd, superio, itwd_driver, itwd_devclass, NULL, NULL);
+MODULE_DEPEND(itwd, superio, 1, 1, 1);
+MODULE_VERSION(itwd, 1);
Modified: head/sys/i386/conf/NOTES
==============================================================================
--- head/sys/i386/conf/NOTES Wed Oct 16 14:55:56 2019 (r353646)
+++ head/sys/i386/conf/NOTES Wed Oct 16 14:57:38 2019 (r353647)
@@ -816,11 +816,13 @@ hint.pcf.0.irq="5"
# amdsbwd: AMD SB7xx watchdog timer
# viawd: VIA south bridge watchdog timer
# wbwd: Winbond watchdog timer
+# itwd: ITE Super I/O watchdog timer
#
device ichwd
device amdsbwd
device viawd
device wbwd
+device itwd
#
# Temperature sensors:
Added: head/sys/modules/itwd/Makefile
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/modules/itwd/Makefile Wed Oct 16 14:57:38 2019 (r353647)
@@ -0,0 +1,9 @@
+# $FreeBSD$
+
+.PATH: ${SRCTOP}/sys/dev/itwd
+
+KMOD= itwd
+SRCS= itwd.c
+SRCS+= device_if.h bus_if.h isa_if.h
+
+.include <bsd.kmod.mk>
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