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Add watchdog support for VIA south bridge chipset.

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Tested on VT8251, VX900 but CX700, VX800, VX855 should works.

MFC after:	1 month
Sponsored by: NETASQ
This commit is contained in:
Fabien Thomas 2011-12-12 09:50:33 +00:00
parent 0e225211a0
commit 61af1d1393
10 changed files with 457 additions and 0 deletions
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2
share/man/man4/Makefile
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@ -499,6 +499,7 @@ MAN= aac.4 \
vga.4 \
vge.4 \
viapm.4 \
${_viawd.4} \
vinum.4 \
vkbd.4 \
vlan.4 \
@ -711,6 +712,7 @@ _speaker.4= speaker.4
_spkr.4= spkr.4
_tpm.4= tpm.4
_urtw.4= urtw.4
_viawd.4= viawd.4
_wpi.4= wpi.4
_xen.4= xen.4

79
share/man/man4/viawd.4 Normal file
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@ -0,0 +1,79 @@
.\"-
.\" Copyright (c) 2011 Fabien Thomas <fabient@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, 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 December 7, 2011
.Dt VIAWD 4
.Os
.Sh NAME
.Nm viawd
.Nd device driver for VIA south bridge watchdog timer
.Sh SYNOPSIS
To compile this driver into the kernel,
place the following line in your
kernel configuration file:
.Bd -ragged -offset indent
.Cd "device viawd"
.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
viawd_load="YES"
.Ed
.Sh DESCRIPTION
The
.Nm
driver provides
.Xr watchdog 4
support for the watchdog interrupt timer present on
VIA south bridge chipset (VT8251, CX700, VX800, VX855, VX900).
.Pp
The VIA south bridge have a built-in watchdog timer,
which can be enabled and disabled by user's program and set between
1 to 1023 seconds.
.Pp
The
.Nm
driver when unloaded with running watchdog will reschedule the watchdog
to 5 minutes.
.Sh SEE ALSO
.Xr watchdog 4 ,
.Xr watchdog 8 ,
.Xr watchdogd 8 ,
.Xr watchdog 9
.Sh HISTORY
The
.Nm
driver first appeared in
.Fx 10.0 .
.Sh AUTHORS
.An -nosplit
The
.Nm
driver and this manual page were written by
.An Fabien Thomas Aq fabient@FreeBSD.org .

1
sys/amd64/conf/NOTES
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@ -458,6 +458,7 @@ device tpm
#
device ichwd
device amdsbwd
device viawd
#
# Temperature sensors:

1
sys/conf/files.amd64
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@ -260,6 +260,7 @@ dev/tpm/tpm.c optional tpm
dev/tpm/tpm_acpi.c optional tpm acpi
dev/tpm/tpm_isa.c optional tpm isa
dev/uart/uart_cpu_amd64.c optional uart
dev/viawd/viawd.c optional viawd
dev/wpi/if_wpi.c optional wpi
isa/syscons_isa.c optional sc
isa/vga_isa.c optional vga

1
sys/conf/files.i386
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@ -236,6 +236,7 @@ dev/tpm/tpm.c optional tpm
dev/tpm/tpm_acpi.c optional tpm acpi
dev/tpm/tpm_isa.c optional tpm isa
dev/uart/uart_cpu_i386.c optional uart
dev/viawd/viawd.c optional viawd
dev/acpica/acpi_if.m standard
dev/acpi_support/acpi_wmi_if.m standard
dev/wpi/if_wpi.c optional wpi

286
sys/dev/viawd/viawd.c Normal file
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@ -0,0 +1,286 @@
/*-
* Copyright (c) 2011 Fabien Thomas <fthomas@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, 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/module.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <machine/resource.h>
#include <sys/watchdog.h>
#include <isa/isavar.h>
#include <dev/pci/pcivar.h>
#include "viawd.h"
#define viawd_read_wd_4(sc, off) \
bus_space_read_4((sc)->wd_bst, (sc)->wd_bsh, (off))
#define viawd_write_wd_4(sc, off, val) \
bus_space_write_4((sc)->wd_bst, (sc)->wd_bsh, (off), (val))
static struct viawd_device viawd_devices[] = {
{ DEVICEID_VT8251, "VIA VT8251 watchdog timer" },
{ DEVICEID_CX700, "VIA CX700 watchdog timer" },
{ DEVICEID_VX800, "VIA VX800 watchdog timer" },
{ DEVICEID_VX855, "VIA VX855 watchdog timer" },
{ DEVICEID_VX900, "VIA VX900 watchdog timer" },
{ 0, NULL },
};
static devclass_t viawd_devclass;
static device_t
viawd_find(struct viawd_device **id_p)
{
struct viawd_device *id;
device_t sb_dev = NULL;
/* Look for a supported VIA south bridge. */
for (id = viawd_devices; id->desc != NULL; ++id)
if ((sb_dev = pci_find_device(VENDORID_VIA, id->device)) != NULL)
break;
if (sb_dev == NULL)
return (NULL);
if (id_p != NULL)
*id_p = id;
return (sb_dev);
}
static void
viawd_tmr_state(struct viawd_softc *sc, int enable)
{
uint32_t reg;
reg = viawd_read_wd_4(sc, VIAWD_MEM_CTRL);
if (enable)
reg |= VIAWD_MEM_CTRL_TRIGGER | VIAWD_MEM_CTRL_ENABLE;
else
reg &= ~VIAWD_MEM_CTRL_ENABLE;
viawd_write_wd_4(sc, VIAWD_MEM_CTRL, reg);
}
static void
viawd_tmr_set(struct viawd_softc *sc, unsigned int timeout)
{
/* Keep value in range. */
if (timeout < VIAWD_MEM_COUNT_MIN)
timeout = VIAWD_MEM_COUNT_MIN;
else if (timeout > VIAWD_MEM_COUNT_MAX)
timeout = VIAWD_MEM_COUNT_MAX;
viawd_write_wd_4(sc, VIAWD_MEM_COUNT, timeout);
sc->timeout = timeout;
}
/*
* Watchdog event handler - called by the framework to enable or disable
* the watchdog or change the initial timeout value.
*/
static void
viawd_event(void *arg, unsigned int cmd, int *error)
{
struct viawd_softc *sc = arg;
unsigned int timeout;
/* Convert from power-of-two-ns to second. */
cmd &= WD_INTERVAL;
timeout = ((uint64_t)1 << cmd) / 1000000000;
if (cmd) {
if (timeout != sc->timeout)
viawd_tmr_set(sc, timeout);
viawd_tmr_state(sc, 1);
*error = 0;
} else
viawd_tmr_state(sc, 0);
}
static void
viawd_identify(driver_t *driver, device_t parent)
{
device_t dev;
device_t sb_dev;
struct viawd_device *id_p;
sb_dev = viawd_find(&id_p);
if (sb_dev == NULL)
return;
/* Good, add child to bus. */
if ((dev = device_find_child(parent, driver->name, 0)) == NULL)
dev = BUS_ADD_CHILD(parent, 0, driver->name, 0);
if (dev == NULL)
return;
device_set_desc_copy(dev, id_p->desc);
}
static int
viawd_probe(device_t dev)
{
/* Do not claim some ISA PnP device by accident. */
if (isa_get_logicalid(dev) != 0)
return (ENXIO);
return (0);
}
static int
viawd_attach(device_t dev)
{
device_t sb_dev;
struct viawd_softc *sc;
struct viawd_device *id_p;
uint32_t pmbase, reg;
sc = device_get_softc(dev);
sc->dev = dev;
sb_dev = viawd_find(&id_p);
if (sb_dev == NULL) {
device_printf(dev, "Can not find watchdog device.\n");
goto fail;
}
sc->sb_dev = sb_dev;
/* Get watchdog memory base. */
pmbase = pci_read_config(sb_dev, VIAWD_CONFIG_BASE, 4);
if (pmbase == 0) {
device_printf(dev,
"Watchdog disabled in BIOS or hardware\n");
goto fail;
}
/* Allocate I/O register space. */
sc->wd_rid = 0;
sc->wd_res = bus_alloc_resource(dev, SYS_RES_MEMORY, &sc->wd_rid,
pmbase, pmbase + VIAWD_MEM_LEN - 1, VIAWD_MEM_LEN,
RF_ACTIVE | RF_SHAREABLE);
if (sc->wd_res == NULL) {
device_printf(dev, "Unable to map watchdog memory\n");
goto fail;
}
sc->wd_bst = rman_get_bustag(sc->wd_res);
sc->wd_bsh = rman_get_bushandle(sc->wd_res);
/* Check if watchdog fired last boot. */
reg = viawd_read_wd_4(sc, VIAWD_MEM_CTRL);
if (reg & VIAWD_MEM_CTRL_FIRED) {
device_printf(dev,
"ERROR: watchdog rebooted the system\n");
/* Reset bit state. */
viawd_write_wd_4(sc, VIAWD_MEM_CTRL, reg);
}
/* Register the watchdog event handler. */
sc->ev_tag = EVENTHANDLER_REGISTER(watchdog_list, viawd_event, sc, 0);
return (0);
fail:
if (sc->wd_res != NULL)
bus_release_resource(dev, SYS_RES_MEMORY,
sc->wd_rid, sc->wd_res);
return (ENXIO);
}
static int
viawd_detach(device_t dev)
{
struct viawd_softc *sc;
uint32_t reg;
sc = device_get_softc(dev);
/* Deregister event handler. */
if (sc->ev_tag != NULL)
EVENTHANDLER_DEREGISTER(watchdog_list, sc->ev_tag);
sc->ev_tag = NULL;
/*
* Do not stop the watchdog on shutdown if active but bump the
* timer to avoid spurious reset.
*/
reg = viawd_read_wd_4(sc, VIAWD_MEM_CTRL);
if (reg & VIAWD_MEM_CTRL_ENABLE) {
viawd_tmr_set(sc, VIAWD_TIMEOUT_SHUTDOWN);
viawd_tmr_state(sc, 1);
device_printf(dev,
"Keeping watchog alive during shutdown for %d seconds\n",
VIAWD_TIMEOUT_SHUTDOWN);
}
if (sc->wd_res != NULL)
bus_release_resource(sc->dev, SYS_RES_MEMORY,
sc->wd_rid, sc->wd_res);
return (0);
}
static device_method_t viawd_methods[] = {
DEVMETHOD(device_identify, viawd_identify),
DEVMETHOD(device_probe, viawd_probe),
DEVMETHOD(device_attach, viawd_attach),
DEVMETHOD(device_detach, viawd_detach),
DEVMETHOD(device_shutdown, viawd_detach),
{0,0}
};
static driver_t viawd_driver = {
"viawd",
viawd_methods,
sizeof(struct viawd_softc),
};
static int
viawd_modevent(module_t mode, int type, void *data)
{
int error = 0;
switch (type) {
case MOD_LOAD:
printf("viawd module loaded\n");
break;
case MOD_UNLOAD:
printf("viawd module unloaded\n");
break;
case MOD_SHUTDOWN:
printf("viawd module shutting down\n");
break;
}
return (error);
}
DRIVER_MODULE(viawd, isa, viawd_driver, viawd_devclass, viawd_modevent, NULL);

75
sys/dev/viawd/viawd.h Normal file
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@ -0,0 +1,75 @@
/*-
* Copyright (c) 2011 Fabien Thomas <fthomas@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, 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.
*
* $FreeBSD$
*/
#ifndef _VIAWD_H_
#define _VIAWD_H_
struct viawd_device {
uint16_t device;
char *desc;
};
struct viawd_softc {
device_t dev;
device_t sb_dev;
int wd_rid;
struct resource *wd_res;
bus_space_tag_t wd_bst;
bus_space_handle_t wd_bsh;
eventhandler_tag ev_tag;
unsigned int timeout;
};
#define VENDORID_VIA 0x1106
#define DEVICEID_VT8251 0x3287
#define DEVICEID_CX700 0x8324
#define DEVICEID_VX800 0x8353
#define DEVICEID_VX855 0x8409
#define DEVICEID_VX900 0x8410
#define VIAWD_CONFIG_BASE 0xE8
#define VIAWD_MEM_LEN 8
#define VIAWD_MEM_CTRL 0x00
#define VIAWD_MEM_CTRL_TRIGGER 0x000000080
#define VIAWD_MEM_CTRL_DISABLE 0x000000008
#define VIAWD_MEM_CTRL_POWEROFF 0x000000004
#define VIAWD_MEM_CTRL_FIRED 0x000000002
#define VIAWD_MEM_CTRL_ENABLE 0x000000001
#define VIAWD_MEM_COUNT 0x04
#define VIAWD_MEM_COUNT_MIN 1
#define VIAWD_MEM_COUNT_MAX 1023
#define VIAWD_TIMEOUT_SHUTDOWN (5 * 60)
#endif

1
sys/i386/conf/NOTES
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@ -831,6 +831,7 @@ hint.pcf.0.irq="5"
#
device ichwd
device amdsbwd
device viawd
#
# Temperature sensors:

3
sys/modules/Makefile
View File

@ -318,6 +318,7 @@ SUBDIR= ${_3dfx} \
${_vesa} \
${_virtio} \
vge \
${_viawd} \
vkbd \
${_vpo} \
vr \
@ -528,6 +529,7 @@ _nve= nve
_nvram= nvram
_nxge= nxge
_tpm= tpm
_viawd= viawd
_wpi= wpi
_wpifw= wpifw
.if ${MK_CRYPT} != "no" || defined(ALL_MODULES)
@ -637,6 +639,7 @@ _sppp= sppp
_tpm= tpm
_twa= twa
_vesa= vesa
_viawd= viawd
_virtio= virtio
_vxge= vxge
_x86bios= x86bios

8
sys/modules/viawd/Makefile Normal file
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@ -0,0 +1,8 @@
# $FreeBSD$
.PATH: ${.CURDIR}/../../dev/viawd
KMOD= viawd
SRCS= viawd.c device_if.h bus_if.h pci_if.h isa_if.h
.include <bsd.kmod.mk>