NetBSD-5.0.2/sys/dev/pci/amdpm.c
/* $NetBSD: amdpm.c,v 1.30 2008/04/28 20:23:54 martin 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 1.30 2008/04/28 20:23:54 martin 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/rnd.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 *);
#ifdef AMDPM_RND_COUNTERS
#define AMDPM_RNDCNT_INCR(ev) (ev)->ev_count++
#endif
static int
amdpm_match(struct device *parent, struct cfdata *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_attach(struct device *parent, struct device *self, void *aux)
{
struct amdpm_softc *sc = (struct amdpm_softc *) self;
struct pci_attach_args *pa = aux;
char devinfo[256];
pcireg_t confreg, pmptrreg;
u_int32_t pmreg;
int i;
aprint_naive("\n");
pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo, sizeof(devinfo));
aprint_normal(": %s (rev. 0x%02x)\n", devinfo,
PCI_REVISION(pa->pa_class));
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;
#if 0
aprint_normal_dev(&sc->sc_dev, "");
pci_conf_print(pa->pa_pc, pa->pa_tag, NULL);
#endif
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(&sc->sc_dev, "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(&sc->sc_dev, "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(&sc->sc_dev, "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(&sc->sc_dev, "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(&sc->sc_dev, sc->sc_iot, sc->sc_ioh,
AMDPM_TMR, ((confreg & AMDPM_TMR32) ? ACPIPMT_32BIT : 0));
}
/* try to attach devices on the smbus */
if (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_PBC8111_ACPI ||
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(&sc->sc_dev, ""
"random number generator enabled (apprx. %dms)\n",
i);
callout_init(&sc->sc_rnd_ch, 0);
rnd_attach_source(&sc->sc_rnd_source,
device_xname(&sc->sc_dev), RND_TYPE_RNG,
/*
* XXX Careful! The use of RND_FLAG_NO_ESTIMATE
* XXX here is unobvious: we later feed raw bits
* XXX into the "entropy pool" with rnd_add_data,
* XXX explicitly supplying an entropy estimate.
* XXX In this context, NO_ESTIMATE serves only
* XXX to prevent rnd_add_data from trying to
* XXX use the *time at which we added the data*
* XXX as entropy, which is not a good idea since
* XXX we add data periodically from a callout.
*/
RND_FLAG_NO_ESTIMATE);
#ifdef AMDPM_RND_COUNTERS
evcnt_attach_dynamic(&sc->sc_rnd_hits, EVCNT_TYPE_MISC,
NULL, device_xname(&sc->sc_dev), "rnd hits");
evcnt_attach_dynamic(&sc->sc_rnd_miss, EVCNT_TYPE_MISC,
NULL, device_xname(&sc->sc_dev), "rnd miss");
for (i = 0; i < 256; i++) {
evcnt_attach_dynamic(&sc->sc_rnd_data[i],
EVCNT_TYPE_MISC, NULL, device_xname(&sc->sc_dev),
"rnd data");
}
#endif
amdpm_rnd_callout(sc);
}
}
}
CFATTACH_DECL(amdpm, sizeof(struct amdpm_softc),
amdpm_match, amdpm_attach, NULL, NULL);
static void
amdpm_rnd_callout(void *v)
{
struct amdpm_softc *sc = v;
u_int32_t rngreg;
#ifdef AMDPM_RND_COUNTERS
int i;
#endif
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);
#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
callout_reset(&sc->sc_rnd_ch, 1, amdpm_rnd_callout, sc);
}