> Date: Thu, 17 Mar 2016 14:28:04 +0900
> From: Masao Uebayashi <uebay...@tombiinc.com>
>
> This tiny driver is only meant for a backup watchdog configuration on
> QEMU, whose ICH watchdog, supported by ichwdt(4), seems broken.
>
> ib700wdt(4) supports only 0-30 second timeouts but in practice it should
> be good enough.
The problem is that isa-style probes like this are dangerous. That is
probably why you didn't enable this driver by default. But if you
don't enable the code, it will rot.
Is there a better way to detect this "device"? For example in the
acpi device tree?
> diff --git a/sys/arch/amd64/conf/GENERIC b/sys/arch/amd64/conf/GENERIC
> index fee3c2a..82e7de0 100644
> --- a/sys/arch/amd64/conf/GENERIC
> +++ b/sys/arch/amd64/conf/GENERIC
> @@ -608,6 +608,7 @@ bktr0 at pci?
> radio* at bktr?
>
> #wdt0 at pci? # Ind Computer Source PCI-WDT50x driver
> +#ib700wdt* at isa? port 0x441 # iBase 700 (IB700) Watchdog Timer
>
> # crypto support
> hifn* at pci? # Hi/fn 7751 crypto card
> diff --git a/sys/arch/i386/conf/GENERIC b/sys/arch/i386/conf/GENERIC
> index 0984e5b..dbb7df6 100644
> --- a/sys/arch/i386/conf/GENERIC
> +++ b/sys/arch/i386/conf/GENERIC
> @@ -108,6 +108,7 @@ geodesc* at pci? # Geode SC1100/SCx200 IAOC
> wdt0 at pci? # Ind Computer Source PCI-WDT50x driver
> berkwdt0 at pci? # Berkshire PCI-PC Watchdog driver
> pwdog0 at pci? # Quancom PWDOG1 watchdog timer
> +#ib700wdt* at isa? port 0x441 # iBase 700 (IB700) Watchdog Timer
>
> # National Semiconductor LM7[89] and compatible hardware monitors
> lm0 at isa? port 0x290
> diff --git a/sys/dev/isa/files.isa b/sys/dev/isa/files.isa
> index 863d11c..92a9ecc 100644
> --- a/sys/dev/isa/files.isa
> +++ b/sys/dev/isa/files.isa
> @@ -380,3 +380,8 @@ file dev/isa/isagpio.c isagpio
> #file dev/isa/pcmcia_pcic.c pcic | pcicmaster
>
> #file dev/isa/pcmcia_isa.c pcmcia
> +
> +# iBase 700 (IB700) Watchdog Timer
> +device ib700wdt
> +attach ib700wdt at isa
> +file dev/isa/ib700wdt.c ib700wdt
> diff --git a/sys/dev/isa/ib700wdt.c b/sys/dev/isa/ib700wdt.c
> new file mode 100644
> index 0000000..cdad79f
> --- /dev/null
> +++ b/sys/dev/isa/ib700wdt.c
> @@ -0,0 +1,142 @@
> +/*
> + * Copyright (c) 2016 Masao Uebayashi <uebay...@tombiinc.com>
> + *
> + * Permission to use, copy, modify, and distribute this software for any
> + * purpose with or without fee is hereby granted, provided that the above
> + * copyright notice and this permission notice appear in all copies.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
> + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
> + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
> + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
> + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
> + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
> + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
> + */
> +
> +#include <sys/param.h>
> +#include <sys/systm.h>
> +#include <sys/device.h>
> +#include <sys/kernel.h>
> +#include <sys/timeout.h>
> +#include <machine/bus.h>
> +#include <sys/event.h>
> +
> +#include <dev/isa/isavar.h>
> +
> +/*
> + * IB700 USER'S MANUAL
> + * Version 1.0B
> + * p28
> + * Watchdog Timer Configuration
> + */
> +
> +#define IB700WDT_BASE 0x441
> +#define IB700WDT_SIZE 3
> +#define IB700WDT_DIS 0 /* 0x441 */
> +#define IB700WDT_ENA 2 /* 0x443 */
> +#define IB700WDT_SEC_MIN 0
> +#define IB700WDT_SEC_MAX 30
> +
> +static inline uint8_t
> +ib700wdt_sec2val(int sec)
> +{
> + /* 0/1sec = 0xf, 2/3sec = 0xe, ..., 28/29 = 0x1, 30sec = 0x0 */
> + return (0xf - (sec * 0xf / 30));
> +}
> +
> +/*
> + * Driver for iBase 700 Watchdog Timer
> + * Mainly meant for QEMU's "ib700" watchdog device
> + * Can't handle immediate reset (sec=0)
> + */
> +
> +struct ib700wdt_softc {
> + struct device sc_dev;
> + bus_space_tag_t sc_iot;
> + bus_space_handle_t sc_ioh;
> + int sc_period;
> +};
> +
> +int ib700wdt_match(struct device *, void *, void *);
> +void ib700wdt_attach(struct device *, struct device *, void *);
> +int ib700wdt_activate(struct device *, int);
> +
> +int ib700wdt_cb(void *, int);
> +
> +struct cfattach ib700wdt_ca = {
> + sizeof(struct ib700wdt_softc),
> + ib700wdt_match, ib700wdt_attach, NULL, ib700wdt_activate
> +};
> +
> +struct cfdriver ib700wdt_cd = {
> + NULL, "ib700wdt", DV_DULL
> +};
> +
> +int
> +ib700wdt_match(struct device *parent, void *match, void *aux)
> +{
> + struct isa_attach_args *ia = aux;
> +
> + ia->ia_iosize = IB700WDT_SIZE;
> + ia->ia_msize = 0;
> +
> + return (1);
> +}
> +
> +void
> +ib700wdt_attach(struct device *parent, struct device *self, void *aux)
> +{
> + struct ib700wdt_softc *sc = (struct ib700wdt_softc *)self;
> + struct isa_attach_args *ia = aux;
> +
> + sc->sc_iot = ia->ia_iot;
> +
> + if (bus_space_map(sc->sc_iot, ia->ia_iobase, IB700WDT_SIZE, 0,
> &sc->sc_ioh))
> + return;
> +
> + printf("\n");
> +
> + wdog_register(ib700wdt_cb, sc);
> +}
> +
> +int
> +ib700wdt_activate(struct device *self, int act)
> +{
> + switch (act) {
> + case DVACT_POWERDOWN:
> + wdog_shutdown(self);
> + break;
> + }
> +
> + return (0);
> +}
> +
> +int
> +ib700wdt_cb(void *arg, int period)
> +{
> + struct ib700wdt_softc *sc = arg;
> + uint8_t val;
> +
> + if (period == 0) {
> + if (sc->sc_period != 0)
> + bus_space_write_1(sc->sc_iot, sc->sc_ioh, IB700WDT_DIS,
> 0);
> + } else {
> + if (period < IB700WDT_SEC_MIN)
> + period = IB700WDT_SEC_MIN;
> + else if (period > IB700WDT_SEC_MAX)
> + period = IB700WDT_SEC_MAX;
> + if (sc->sc_period != period) {
> + val = ib700wdt_sec2val(period);
> + bus_space_write_1(sc->sc_iot, sc->sc_ioh, IB700WDT_ENA,
> val);
> + }
> + if (sc->sc_period == 0)
> + val = ib700wdt_sec2val(period);
> + else
> + val = ib700wdt_sec2val(sc->sc_period);
> + bus_space_write_1(sc->sc_iot, sc->sc_ioh, IB700WDT_ENA, val);
> + }
> + sc->sc_period = period;
> +
> + return (period);
> +}
>
>
