/*      $$NetBSD: pwdog.c,v 1.10 2017/01/20 12:25:07 maya Exp $ */
/*      $OpenBSD: pwdog.c,v 1.7 2010/04/08 00:23:53 tedu Exp $ */

/*
* Copyright (c) 2006, 2011 Marc Balmer <[email protected]>
*
* 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/types.h>
#include <sys/param.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/systm.h>

#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcidevs.h>

#include <dev/sysmon/sysmonvar.h>

struct pwdog_softc {
       device_t                sc_dev;

       bus_space_tag_t         sc_iot;
       bus_space_handle_t      sc_ioh;
       bus_size_t              sc_iosize;

       struct sysmon_wdog      sc_smw;
       bool                    sc_smw_valid;
};

/* registers */
#define PWDOG_ACTIVATE  0
#define PWDOG_DISABLE   1

/* maximum timeout period in seconds */
#define PWDOG_MAX_PERIOD        (12*60) /* 12 minutes */

static int pwdog_match(device_t, cfdata_t, void *);
static void pwdog_attach(device_t, device_t, void *);
static int pwdog_detach(device_t, int);
static bool pwdog_suspend(device_t, const pmf_qual_t *);
static bool pwdog_resume(device_t, const pmf_qual_t *);
static int pwdog_setmode(struct sysmon_wdog *);
static int pwdog_tickle(struct sysmon_wdog *);

CFATTACH_DECL_NEW(
   pwdog,
   sizeof(struct pwdog_softc),
   pwdog_match,
   pwdog_attach,
   pwdog_detach,
   NULL
);

static int
pwdog_match(device_t parent, cfdata_t match, void *aux)
{
       struct pci_attach_args *pa = (struct pci_attach_args *)aux;

       if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_QUANCOM &&
           PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_QUANCOM_PWDOG1)
               return 1;
       return 0;
}

void
pwdog_attach(device_t parent, device_t self, void *aux)
{
       struct pwdog_softc *sc = device_private(self);
       struct pci_attach_args *const pa = (struct pci_attach_args *)aux;
       pcireg_t memtype;

       aprint_naive("\n");
       memtype = pci_mapreg_type(pa->pa_pc, pa->pa_tag, PCI_MAPREG_START);
       if (pci_mapreg_map(pa, PCI_MAPREG_START, memtype, 0, &sc->sc_iot,
           &sc->sc_ioh, NULL, &sc->sc_iosize)) {
               aprint_error("\n");
               aprint_error_dev(self, "PCI %s region not found\n",
                   memtype == PCI_MAPREG_TYPE_IO ? "I/O" : "memory");
               return;
       }
       aprint_normal("\n");

       sc->sc_dev = self;

       if (!pmf_device_register(self, pwdog_suspend, pwdog_resume))
               aprint_error_dev(self, "couldn't establish power handler\n");
       bus_space_write_1(sc->sc_iot, sc->sc_ioh, PWDOG_DISABLE, 0);

       sc->sc_smw.smw_name = device_xname(self);
       sc->sc_smw.smw_cookie = sc;
       sc->sc_smw.smw_setmode = pwdog_setmode;
       sc->sc_smw.smw_tickle = pwdog_tickle;
       sc->sc_smw.smw_period = PWDOG_MAX_PERIOD;

       if (sysmon_wdog_register(&sc->sc_smw))
               aprint_error_dev(self, "couldn't register with sysmon\n");
       else
               sc->sc_smw_valid = true;
}

static int
pwdog_detach(device_t self, int flags)
{
       struct pwdog_softc *sc = device_private(self);

       /* XXX check flags & DETACH_FORCE (or DETACH_SHUTDOWN)? */
       if (sc->sc_smw_valid) {
               if ((sc->sc_smw.smw_mode & WDOG_MODE_MASK)
                   != WDOG_MODE_DISARMED)
                       return EBUSY;

               sysmon_wdog_unregister(&sc->sc_smw);
               sc->sc_smw_valid = false;
       }

       pmf_device_deregister(self);

       if (sc->sc_iosize)
               bus_space_unmap(sc->sc_iot, sc->sc_ioh, sc->sc_iosize);
       return 0;
}

static bool
pwdog_resume(device_t self, const pmf_qual_t *qual)
{
       struct pwdog_softc *sc = device_private(self);

       if (sc->sc_smw_valid == false)
               return true;

       /*
        * suspend is inhibited when the watchdog timer was armed,
        * so when we end up here, the watchdog is disabled; program the
        * hardware accordingly.
        */
       bus_space_write_1(sc->sc_iot, sc->sc_ioh, PWDOG_DISABLE, 0);
       return true;
}

static bool
pwdog_suspend(device_t self, const pmf_qual_t *qual)
{
       struct pwdog_softc *sc = device_private(self);

       if (sc->sc_smw_valid == false)
               return true;

       if ((sc->sc_smw.smw_mode & WDOG_MODE_MASK) != WDOG_MODE_DISARMED)
               return false;

       return true;
}

static int
pwdog_setmode(struct sysmon_wdog *smw)
{
       struct pwdog_softc *sc = smw->smw_cookie;

       switch (smw->smw_mode & WDOG_MODE_MASK) {
       case WDOG_MODE_DISARMED:
               bus_space_write_1(sc->sc_iot, sc->sc_ioh, PWDOG_DISABLE, 0);
               break;
       default:
               /*
                * NB: the timer period set by the user is ignored
                * since the period can only be set in hardware.
                */
               bus_space_write_1(sc->sc_iot, sc->sc_ioh, PWDOG_ACTIVATE, 0);
       }
       return 0;
}

static int
pwdog_tickle(struct sysmon_wdog *smw)
{
       struct pwdog_softc *sc = smw->smw_cookie;

       bus_space_write_1(sc->sc_iot, sc->sc_ioh, PWDOG_ACTIVATE, 0);
       return 0;
}

MODULE(MODULE_CLASS_DRIVER, pwdog, "pci,sysmon_wdog");

#ifdef _MODULE
#include "ioconf.c"
#endif

static int
pwdog_modcmd(modcmd_t cmd, void *opaque)
{
       int error;

       error = 0;
       switch (cmd) {
       case MODULE_CMD_INIT:
#ifdef _MODULE
               error = config_init_component(cfdriver_ioconf_pwdog,
                   cfattach_ioconf_pwdog, cfdata_ioconf_pwdog);
               if (error)
                       aprint_error("%s: unable to init component\n",
                           pwdog_cd.cd_name);
#endif
               break;
       case MODULE_CMD_FINI:
#ifdef _MODULE
               config_fini_component(cfdriver_ioconf_pwdog,
                   cfattach_ioconf_pwdog, cfdata_ioconf_pwdog);
#endif
               break;
       default:
               error = ENOTTY;
       }
       return error;
}

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