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/* $OpenBSD: gscpm.c,v 1.1 2004/09/15 20:28:53 grange Exp $ */
/*
* Copyright (c) 2004 Alexander Yurchenko <grange@openbsd.org>
*
* 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.
*/
/*
* National Semiconductor Geode SC1100 SMI/ACPI module.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#ifdef __HAVE_TIMECOUNTER
#include <sys/timetc.h>
#endif
#include <machine/bus.h>
#include <dev/pci/pcidevs.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <i386/pci/gscpmreg.h>
struct gscpm_softc {
struct device sc_dev;
pci_chipset_tag_t sc_pc;
pcitag_t sc_tag;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_acpi_ioh;
};
int gscpm_match(struct device *, void *, void *);
void gscpm_attach(struct device *, struct device *, void *);
int gscpm_setperf(int);
#ifdef __HAVE_TIMECOUNTER
u_int gscpm_get_timecount(struct timecounter *tc);
struct timecounter gscpm_timecounter = {
gscpm_get_timecount, /* get_timecount */
0, /* no poll_pps */
0xffffff, /* counter_mask */
14318180 / 4, /* frequency */
"Geode SC1100", /* name */
1000 /* quality */
};
#endif /* __HAVE_TIMECOUNTER */
struct cfattach gscpm_ca = {
sizeof (struct gscpm_softc),
gscpm_match,
gscpm_attach
};
struct cfdriver gscpm_cd = {
NULL, "gscpm", DV_DULL
};
#if 0
static void *gscpm_cookie; /* XXX */
#endif
int
gscpm_match(struct device *parent, void *match, void *aux)
{
struct pci_attach_args *pa = aux;
if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_NS &&
PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_NS_SC1100_SMI)
return (1);
return (0);
}
void
gscpm_attach(struct device *parent, struct device *self, void *aux)
{
struct gscpm_softc *sc = (struct gscpm_softc *)self;
struct pci_attach_args *pa = aux;
pcireg_t csr, acpibase;
sc->sc_pc = pa->pa_pc;
sc->sc_tag = pa->pa_tag;
sc->sc_iot = pa->pa_iot;
/* Enable I/O space */
csr = pci_conf_read(sc->sc_pc, sc->sc_tag, PCI_COMMAND_STATUS_REG);
pci_conf_write(sc->sc_pc, sc->sc_tag, PCI_COMMAND_STATUS_REG,
csr | PCI_COMMAND_IO_ENABLE);
/* Map ACPI registers */
acpibase = pci_conf_read(sc->sc_pc, sc->sc_tag, GSCPM_ACPIBASE);
if (bus_space_map(sc->sc_iot, PCI_MAPREG_IO_ADDR(acpibase),
GSCPM_ACPISIZE, 0, &sc->sc_acpi_ioh)) {
printf(": failed to map ACPI registers\n");
return;
}
printf("\n");
#ifdef __HAVE_TIMECOUNTER
/* Hook into the kern_tc */
gscpm_timecounter.tc_priv = sc;
tc_init(&gscpm_timecounter);
#endif /* __HAVE_TIMECOUNTER */
/* XXX: disabled due to unresolved yet hardware errata */
#if 0
/* Hook into the hw.setperf sysctl */
gscpm_cookie = sc;
cpu_setperf = gscpm_setperf;
#endif
}
#ifdef __HAVE_TIMECOUNTER
u_int
gscpm_get_timecount(struct timecounter *tc)
{
struct gscpm_softc *sc = tc->tc_priv;
u_int u1, u2, u3;
u2 = bus_space_read_4(sc->sc_iot, sc->sc_acpi_ioh, GSCPM_PM_TMR);
u3 = bus_space_read_4(sc->sc_iot, sc->sc_acpi_ioh, GSCPM_PM_TMR);
do {
u1 = u2;
u2 = u3;
u3 = bus_space_read_4(sc->sc_iot, sc->sc_acpi_ioh,
GSCPM_PM_TMR);
} while (u1 > u2 || u2 > u3);
return (u2);
}
#endif /* __HAVE_TIMECOUNTER */
#if 0
int
gscpm_setperf(int level)
{
struct gscpm_softc *sc = gscpm_cookie;
int i;
u_int32_t pctl;
pctl = bus_space_read_4(sc->sc_iot, sc->sc_acpi_ioh, GSCPM_P_CNT);
if (level == 100) {
/* 100 is a maximum perfomance, disable throttling */
pctl &= ~GSCPM_P_CNT_THTEN;
} else {
for (i = 0; i < GSCPM_THT_LEVELS; i++)
if (level >= gscpm_tht[i].level)
break;
pctl = (0xf0 | GSCPM_P_CNT_THTEN |
GSCPM_P_CNT_CLK(gscpm_tht[i].value));
}
/* Update processor control register */
bus_space_write_4(sc->sc_iot, sc->sc_acpi_ioh, GSCPM_P_CNT, pctl);
return (0);
}
#endif
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