/*      $NetBSD: amdpm.c,v 1.43 2022/03/19 11:37:06 riastradh Exp $     */

/*-
* Copyright (c) 2002 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Enami Tsugutomo.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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>
__KERNEL_RCSID(0, "$NetBSD: amdpm.c,v 1.43 2022/03/19 11:37:06 riastradh Exp $");

#include "opt_amdpm.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/callout.h>
#include <sys/rndsource.h>
#include <sys/mutex.h>

#include <sys/bus.h>
#include <dev/ic/acpipmtimer.h>

#include <dev/i2c/i2cvar.h>

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

#include <dev/pci/amdpmreg.h>
#include <dev/pci/amdpmvar.h>
#include <dev/pci/amdpm_smbusreg.h>

static void     amdpm_rnd_callout(void *);
static void     amdpm_rnd_callout_locked(void *);

#ifdef AMDPM_RND_COUNTERS
#define AMDPM_RNDCNT_INCR(ev)   (ev)->ev_count++
#endif

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

       if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_AMD) {
               switch (PCI_PRODUCT(pa->pa_id)) {
               case PCI_PRODUCT_AMD_PBC768_PMC:
               case PCI_PRODUCT_AMD_PBC8111_ACPI:
                       return (1);
               }
       }
       if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_NVIDIA) {
               switch (PCI_PRODUCT(pa->pa_id)) {
               case PCI_PRODUCT_NVIDIA_XBOX_SMBUS:
                       return (1);
               }
       }

       return (0);
}

static void
amdpm_rnd_get(size_t bytes, void *priv)
{
       struct amdpm_softc *sc = priv;

       mutex_enter(&sc->sc_mutex);
       sc->sc_rnd_need = bytes;
       amdpm_rnd_callout_locked(sc);
       mutex_exit(&sc->sc_mutex);
}

static void
amdpm_attach(device_t parent, device_t self, void *aux)
{
       struct amdpm_softc *sc = device_private(self);
       struct pci_attach_args *pa = aux;
       pcireg_t confreg, pmptrreg;
       u_int32_t pmreg;
       int i;

       pci_aprint_devinfo(pa, NULL);

       sc->sc_dev = self;

       if (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_NVIDIA_XBOX_SMBUS)
               sc->sc_nforce = 1;
       else
               sc->sc_nforce = 0;

       sc->sc_pc = pa->pa_pc;
       sc->sc_tag = pa->pa_tag;
       sc->sc_iot = pa->pa_iot;
       sc->sc_pa = pa;

       confreg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG);
       /* enable pm i/o space for AMD-8111 and nForce */
       if (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_PBC8111_ACPI ||
           sc->sc_nforce)
               confreg |= AMDPM_PMIOEN;

       /* Enable random number generation for everyone */
       pci_conf_write(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG,
           confreg | AMDPM_RNGEN);
       confreg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG);

       if ((confreg & AMDPM_PMIOEN) == 0) {
               aprint_error_dev(self, "PMxx space isn't enabled\n");
               return;
       }

       if (sc->sc_nforce) {
               pmptrreg = pci_conf_read(pa->pa_pc, pa->pa_tag, NFORCE_PMPTR);
               aprint_normal_dev(self, "power management at 0x%04x\n",
                   NFORCE_PMBASE(pmptrreg));
               if (bus_space_map(sc->sc_iot, NFORCE_PMBASE(pmptrreg),
                   AMDPM_PMSIZE, 0, &sc->sc_ioh)) {
                       aprint_error_dev(self, "failed to map PMxx space\n");
                       return;
               }
       } else {
               pmptrreg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_PMPTR);
               if (bus_space_map(sc->sc_iot, AMDPM_PMBASE(pmptrreg),
                   AMDPM_PMSIZE, 0, &sc->sc_ioh)) {
                       aprint_error_dev(self, "failed to map PMxx space\n");
                       return;
               }
       }

       /* don't attach a timecounter on nforce boards */
       if ((confreg & AMDPM_TMRRST) == 0 && (confreg & AMDPM_STOPTMR) == 0 &&
           !sc->sc_nforce) {
               acpipmtimer_attach(self, sc->sc_iot, sc->sc_ioh,
                 AMDPM_TMR, ((confreg & AMDPM_TMR32) ? ACPIPMT_32BIT : 0));
       }

       mutex_init(&sc->sc_mutex, MUTEX_DEFAULT, IPL_SOFTSERIAL);

       /* try to attach devices on the smbus */
       if (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_PBC8111_ACPI ||
           PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_PBC768_PMC ||
           sc->sc_nforce) {
               amdpm_smbus_attach(sc);
       }

       if (confreg & AMDPM_RNGEN) {
               /* Check to see if we can read data from the RNG. */
               (void) bus_space_read_4(sc->sc_iot, sc->sc_ioh,
                   AMDPM_RNGDATA);
               for (i = 0; i < 1000; i++) {
                       pmreg = bus_space_read_4(sc->sc_iot,
                           sc->sc_ioh, AMDPM_RNGSTAT);
                       if (pmreg & AMDPM_RNGDONE)
                               break;
                       delay(1);
               }
               if ((pmreg & AMDPM_RNGDONE) != 0) {
                       aprint_normal_dev(self, ""
                           "random number generator enabled (apprx. %dms)\n",
                           i);
                       callout_init(&sc->sc_rnd_ch, CALLOUT_MPSAFE);
#ifdef AMDPM_RND_COUNTERS
                       evcnt_attach_dynamic(&sc->sc_rnd_hits, EVCNT_TYPE_MISC,
                           NULL, device_xname(self), "rnd hits");
                       evcnt_attach_dynamic(&sc->sc_rnd_miss, EVCNT_TYPE_MISC,
                           NULL, device_xname(self), "rnd miss");
                       for (i = 0; i < 256; i++) {
                               evcnt_attach_dynamic(&sc->sc_rnd_data[i],
                                   EVCNT_TYPE_MISC, NULL, device_xname(self),
                                   "rnd data");
                       }
#endif
                       rndsource_setcb(&sc->sc_rnd_source,
                                       amdpm_rnd_get, sc);
                       rnd_attach_source(&sc->sc_rnd_source,
                           device_xname(self), RND_TYPE_RNG,
                           RND_FLAG_COLLECT_VALUE|RND_FLAG_HASCB);
               }
       }
}

CFATTACH_DECL_NEW(amdpm, sizeof(struct amdpm_softc),
   amdpm_match, amdpm_attach, NULL, NULL);

static void
amdpm_rnd_callout_locked(void *v)
{
       struct amdpm_softc *sc = v;
       u_int32_t rngreg;
#ifdef AMDPM_RND_COUNTERS
       int i;
#endif

       if (sc->sc_rnd_need < 1) {
               callout_stop(&sc->sc_rnd_ch);
               return;
       }

       if ((bus_space_read_4(sc->sc_iot, sc->sc_ioh, AMDPM_RNGSTAT) &
           AMDPM_RNGDONE) != 0) {
               rngreg = bus_space_read_4(sc->sc_iot, sc->sc_ioh,
                   AMDPM_RNGDATA);
               rnd_add_data(&sc->sc_rnd_source, &rngreg,
                   sizeof(rngreg), sizeof(rngreg) * NBBY);
               sc->sc_rnd_need -= sizeof(rngreg);
#ifdef AMDPM_RND_COUNTERS
               AMDPM_RNDCNT_INCR(&sc->sc_rnd_hits);
               for (i = 0; i < sizeof(rngreg); i++, rngreg >>= NBBY)
                       AMDPM_RNDCNT_INCR(&sc->sc_rnd_data[rngreg & 0xff]);
#endif
       }
#ifdef AMDPM_RND_COUNTERS
       else
               AMDPM_RNDCNT_INCR(&sc->sc_rnd_miss);
#endif
       if (sc->sc_rnd_need > 0) {
               callout_reset(&sc->sc_rnd_ch, 1, amdpm_rnd_callout, sc);
       }
}

static void
amdpm_rnd_callout(void *v)
{
       struct amdpm_softc *sc = v;

       mutex_enter(&sc->sc_mutex);
       amdpm_rnd_callout_locked(v);
       mutex_exit(&sc->sc_mutex);
}

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