223 lines
6.9 KiB
C
223 lines
6.9 KiB
C
/* $NetBSD: amdpm.c,v 1.17 2006/07/11 14:47:49 drochner Exp $ */
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/*-
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* Copyright (c) 2002 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Enami Tsugutomo.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: amdpm.c,v 1.17 2006/07/11 14:47:49 drochner Exp $");
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#include "opt_amdpm.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/device.h>
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#include <sys/callout.h>
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#include <sys/rnd.h>
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#ifdef __HAVE_TIMECOUNTER
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#include <dev/ic/acpipmtimer.h>
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#endif
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#include <dev/i2c/i2cvar.h>
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#include <dev/pci/pcivar.h>
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#include <dev/pci/pcireg.h>
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#include <dev/pci/pcidevs.h>
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#include <dev/pci/amdpmreg.h>
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#include <dev/pci/amdpmvar.h>
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#include <dev/pci/amdpm_smbusreg.h>
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static void amdpm_rnd_callout(void *);
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#ifdef AMDPM_RND_COUNTERS
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#define AMDPM_RNDCNT_INCR(ev) (ev)->ev_count++
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#else
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#define AMDPM_RNDCNT_INCR(ev) /* nothing */
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#endif
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static int
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amdpm_match(struct device *parent, struct cfdata *match, void *aux)
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{
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struct pci_attach_args *pa = aux;
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if (PCI_VENDOR(pa->pa_id) != PCI_VENDOR_AMD)
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return (0);
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switch (PCI_PRODUCT(pa->pa_id)) {
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case PCI_PRODUCT_AMD_PBC768_PMC:
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case PCI_PRODUCT_AMD_PBC8111_ACPI:
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return (1);
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}
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return (0);
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}
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static void
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amdpm_attach(struct device *parent, struct device *self, void *aux)
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{
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struct amdpm_softc *sc = (struct amdpm_softc *) self;
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struct pci_attach_args *pa = aux;
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char devinfo[256];
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pcireg_t confreg, pmptrreg;
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u_int32_t pmreg;
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int i;
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aprint_naive("\n");
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pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo, sizeof(devinfo));
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aprint_normal(": %s (rev. 0x%02x)\n", devinfo,
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PCI_REVISION(pa->pa_class));
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sc->sc_pc = pa->pa_pc;
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sc->sc_tag = pa->pa_tag;
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sc->sc_iot = pa->pa_iot;
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#if 0
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aprint_normal("%s: ", sc->sc_dev.dv_xname);
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pci_conf_print(pa->pa_pc, pa->pa_tag, NULL);
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#endif
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confreg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG);
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/* enable pm i/o space for AMD-8111 */
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if (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_PBC8111_ACPI)
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confreg |= AMDPM_PMIOEN;
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/* Enable random number generation for everyone */
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pci_conf_write(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG,
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confreg | AMDPM_RNGEN);
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confreg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG);
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if ((confreg & AMDPM_PMIOEN) == 0) {
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aprint_error("%s: PMxx space isn't enabled\n",
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sc->sc_dev.dv_xname);
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return;
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}
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pmptrreg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_PMPTR);
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if (bus_space_map(sc->sc_iot, AMDPM_PMBASE(pmptrreg), AMDPM_PMSIZE,
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0, &sc->sc_ioh)) {
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aprint_error("%s: failed to map PMxx space\n",
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sc->sc_dev.dv_xname);
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return;
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}
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#ifdef __HAVE_TIMECOUNTER
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if ((confreg & AMDPM_TMRRST) == 0 && (confreg & AMDPM_STOPTMR) == 0) {
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acpipmtimer_attach(&sc->sc_dev, sc->sc_iot, sc->sc_ioh,
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AMDPM_TMR, ((confreg & AMDPM_TMR32) : ACPIPMT_32BIT : 0));
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}
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#endif
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/* try to attach devices on the smbus */
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if (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_PBC8111_ACPI) {
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amdpm_smbus_attach(sc);
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}
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if (confreg & AMDPM_RNGEN) {
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/* Check to see if we can read data from the RNG. */
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(void) bus_space_read_4(sc->sc_iot, sc->sc_ioh,
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AMDPM_RNGDATA);
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for (i = 0; i < 1000; i++) {
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pmreg = bus_space_read_4(sc->sc_iot,
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sc->sc_ioh, AMDPM_RNGSTAT);
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if (pmreg & AMDPM_RNGDONE)
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break;
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delay(1);
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}
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if ((pmreg & AMDPM_RNGDONE) != 0) {
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aprint_normal("%s: "
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"random number generator enabled (apprx. %dms)\n",
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sc->sc_dev.dv_xname, i);
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callout_init(&sc->sc_rnd_ch);
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rnd_attach_source(&sc->sc_rnd_source,
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sc->sc_dev.dv_xname, RND_TYPE_RNG,
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/*
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* XXX Careful! The use of RND_FLAG_NO_ESTIMATE
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* XXX here is unobvious: we later feed raw bits
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* XXX into the "entropy pool" with rnd_add_data,
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* XXX explicitly supplying an entropy estimate.
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* XXX In this context, NO_ESTIMATE serves only
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* XXX to prevent rnd_add_data from trying to
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* XXX use the *time at which we added the data*
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* XXX as entropy, which is not a good idea since
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* XXX we add data periodically from a callout.
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*/
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RND_FLAG_NO_ESTIMATE);
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#ifdef AMDPM_RND_COUNTERS
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evcnt_attach_dynamic(&sc->sc_rnd_hits, EVCNT_TYPE_MISC,
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NULL, sc->sc_dev.dv_xname, "rnd hits");
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evcnt_attach_dynamic(&sc->sc_rnd_miss, EVCNT_TYPE_MISC,
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NULL, sc->sc_dev.dv_xname, "rnd miss");
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for (i = 0; i < 256; i++) {
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evcnt_attach_dynamic(&sc->sc_rnd_data[i],
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EVCNT_TYPE_MISC, NULL, sc->sc_dev.dv_xname,
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"rnd data");
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}
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#endif
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amdpm_rnd_callout(sc);
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}
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}
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}
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CFATTACH_DECL(amdpm, sizeof(struct amdpm_softc),
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amdpm_match, amdpm_attach, NULL, NULL);
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static void
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amdpm_rnd_callout(void *v)
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{
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struct amdpm_softc *sc = v;
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u_int32_t rngreg;
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#ifdef AMDPM_RND_COUNTERS
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int i;
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#endif
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if ((bus_space_read_4(sc->sc_iot, sc->sc_ioh, AMDPM_RNGSTAT) &
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AMDPM_RNGDONE) != 0) {
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rngreg = bus_space_read_4(sc->sc_iot, sc->sc_ioh,
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AMDPM_RNGDATA);
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rnd_add_data(&sc->sc_rnd_source, &rngreg,
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sizeof(rngreg), sizeof(rngreg) * NBBY);
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#ifdef AMDPM_RND_COUNTERS
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AMDPM_RNDCNT_INCR(&sc->sc_rnd_hits);
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for (i = 0; i < sizeof(rngreg); i++, rngreg >>= NBBY)
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AMDPM_RNDCNT_INCR(&sc->sc_rnd_data[rngreg & 0xff]);
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#endif
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} else
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AMDPM_RNDCNT_INCR(&sc->sc_rnd_miss);
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callout_reset(&sc->sc_rnd_ch, 1, amdpm_rnd_callout, sc);
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}
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