sys/dev/pci/amdpm.c

   1 /*      $NetBSD: amdpm.c,v 1.32 2009/05/06 10:34:32 cegger Exp $        */
   2
   3 /*-
   4  * Copyright (c) 2002 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Enami Tsugutomo.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 __KERNEL_RCSID(0, "$NetBSD: amdpm.c,v 1.32 2009/05/06 10:34:32 cegger Exp $");
  34
  35 #include "opt_amdpm.h"
  36
  37 #include <sys/param.h>
  38 #include <sys/systm.h>
  39 #include <sys/kernel.h>
  40 #include <sys/device.h>
  41 #include <sys/callout.h>
  42 #include <sys/rnd.h>
  43
  44 #include <sys/bus.h>
  45 #include <dev/ic/acpipmtimer.h>
  46
  47 #include <dev/i2c/i2cvar.h>
  48
  49 #include <dev/pci/pcivar.h>
  50 #include <dev/pci/pcireg.h>
  51 #include <dev/pci/pcidevs.h>
  52
  53 #include <dev/pci/amdpmreg.h>
  54 #include <dev/pci/amdpmvar.h>
  55 #include <dev/pci/amdpm_smbusreg.h>
  56
  57 static void     amdpm_rnd_callout(void *);
  58
  59 #ifdef AMDPM_RND_COUNTERS
  60 #define AMDPM_RNDCNT_INCR(ev)   (ev)->ev_count++
  61 #endif
  62
  63 static int
  64 amdpm_match(device_t parent, cfdata_t match, void *aux)
  65 {
  66         struct pci_attach_args *pa = aux;
  67
  68         if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_AMD) {
  69                 switch (PCI_PRODUCT(pa->pa_id)) {
  70                 case PCI_PRODUCT_AMD_PBC768_PMC:
  71                 case PCI_PRODUCT_AMD_PBC8111_ACPI:
  72                         return (1);
  73                 }
  74         }
  75         if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_NVIDIA) {
  76                 switch (PCI_PRODUCT(pa->pa_id)) {
  77                 case PCI_PRODUCT_NVIDIA_XBOX_SMBUS:
  78                         return (1);
  79                 }
  80         }
  81
  82         return (0);
  83 }
  84
  85 static void
  86 amdpm_attach(device_t parent, device_t self, void *aux)
  87 {
  88         struct amdpm_softc *sc = device_private(self);
  89         struct pci_attach_args *pa = aux;
  90         char devinfo[256];
  91         pcireg_t confreg, pmptrreg;
  92         u_int32_t pmreg;
  93         int i;
  94
  95         aprint_naive("\n");
  96         pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo, sizeof(devinfo));
  97         aprint_normal(": %s (rev. 0x%02x)\n", devinfo,
  98             PCI_REVISION(pa->pa_class));
  99
 100         if (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_NVIDIA_XBOX_SMBUS)
 101                 sc->sc_nforce = 1;
 102         else
 103                 sc->sc_nforce = 0;
 104
 105         sc->sc_pc = pa->pa_pc;
 106         sc->sc_tag = pa->pa_tag;
 107         sc->sc_iot = pa->pa_iot;
 108         sc->sc_pa = pa;
 109
 110 #if 0
 111         aprint_normal_dev(&sc->sc_dev, "");
 112         pci_conf_print(pa->pa_pc, pa->pa_tag, NULL);
 113 #endif
 114
 115         confreg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG);
 116         /* enable pm i/o space for AMD-8111 and nForce */
 117         if (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_PBC8111_ACPI ||
 118             sc->sc_nforce)
 119                 confreg |= AMDPM_PMIOEN;
 120
 121         /* Enable random number generation for everyone */
 122         pci_conf_write(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG,
 123             confreg | AMDPM_RNGEN);
 124         confreg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG);
 125
 126         if ((confreg & AMDPM_PMIOEN) == 0) {
 127                 aprint_error_dev(&sc->sc_dev, "PMxx space isn't enabled\n");
 128                 return;
 129         }
 130
 131         if (sc->sc_nforce) {
 132                 pmptrreg = pci_conf_read(pa->pa_pc, pa->pa_tag, NFORCE_PMPTR);
 133                 aprint_normal_dev(&sc->sc_dev, "power management at 0x%04x\n",
 134                     NFORCE_PMBASE(pmptrreg));
 135                 if (bus_space_map(sc->sc_iot, NFORCE_PMBASE(pmptrreg),
 136                     AMDPM_PMSIZE, 0, &sc->sc_ioh)) {
 137                         aprint_error_dev(&sc->sc_dev, "failed to map PMxx space\n");
 138                         return;
 139                 }
 140         } else {
 141                 pmptrreg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_PMPTR);
 142                 if (bus_space_map(sc->sc_iot, AMDPM_PMBASE(pmptrreg),
 143                     AMDPM_PMSIZE, 0, &sc->sc_ioh)) {
 144                         aprint_error_dev(&sc->sc_dev, "failed to map PMxx space\n");
 145                         return;
 146                 }
 147         }
 148
 149         /* don't attach a timecounter on nforce boards */
 150         if ((confreg & AMDPM_TMRRST) == 0 && (confreg & AMDPM_STOPTMR) == 0 &&
 151             !sc->sc_nforce) {
 152                 acpipmtimer_attach(&sc->sc_dev, sc->sc_iot, sc->sc_ioh,
 153                   AMDPM_TMR, ((confreg & AMDPM_TMR32) ? ACPIPMT_32BIT : 0));
 154         }
 155
 156         /* try to attach devices on the smbus */
 157         if (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_PBC8111_ACPI ||
 158             sc->sc_nforce) {
 159                 amdpm_smbus_attach(sc);
 160         }
 161
 162         if (confreg & AMDPM_RNGEN) {
 163                 /* Check to see if we can read data from the RNG. */
 164                 (void) bus_space_read_4(sc->sc_iot, sc->sc_ioh,
 165                     AMDPM_RNGDATA);
 166                 for (i = 0; i < 1000; i++) {
 167                         pmreg = bus_space_read_4(sc->sc_iot,
 168                             sc->sc_ioh, AMDPM_RNGSTAT);
 169                         if (pmreg & AMDPM_RNGDONE)
 170                                 break;
 171                         delay(1);
 172                 }
 173                 if ((pmreg & AMDPM_RNGDONE) != 0) {
 174                         aprint_normal_dev(&sc->sc_dev, ""
 175                             "random number generator enabled (apprx. %dms)\n",
 176                             i);
 177                         callout_init(&sc->sc_rnd_ch, 0);
 178                         rnd_attach_source(&sc->sc_rnd_source,
 179                             device_xname(&sc->sc_dev), RND_TYPE_RNG,
 180                             /*
 181                              * XXX Careful!  The use of RND_FLAG_NO_ESTIMATE
 182                              * XXX here is unobvious: we later feed raw bits
 183                              * XXX into the "entropy pool" with rnd_add_data,
 184                              * XXX explicitly supplying an entropy estimate.
 185                              * XXX In this context, NO_ESTIMATE serves only
 186                              * XXX to prevent rnd_add_data from trying to
 187                              * XXX use the *time at which we added the data*
 188                              * XXX as entropy, which is not a good idea since
 189                              * XXX we add data periodically from a callout.
 190                              */
 191                             RND_FLAG_NO_ESTIMATE);
 192 #ifdef AMDPM_RND_COUNTERS
 193                         evcnt_attach_dynamic(&sc->sc_rnd_hits, EVCNT_TYPE_MISC,
 194                             NULL, device_xname(&sc->sc_dev), "rnd hits");
 195                         evcnt_attach_dynamic(&sc->sc_rnd_miss, EVCNT_TYPE_MISC,
 196                             NULL, device_xname(&sc->sc_dev), "rnd miss");
 197                         for (i = 0; i < 256; i++) {
 198                                 evcnt_attach_dynamic(&sc->sc_rnd_data[i],
 199                                     EVCNT_TYPE_MISC, NULL, device_xname(&sc->sc_dev),
 200                                     "rnd data");
 201                         }
 202 #endif
 203                         amdpm_rnd_callout(sc);
 204                 }
 205         }
 206 }
 207
 208 CFATTACH_DECL(amdpm, sizeof(struct amdpm_softc),
 209     amdpm_match, amdpm_attach, NULL, NULL);
 210
 211 static void
 212 amdpm_rnd_callout(void *v)
 213 {
 214         struct amdpm_softc *sc = v;
 215         u_int32_t rngreg;
 216 #ifdef AMDPM_RND_COUNTERS
 217         int i;
 218 #endif
 219
 220         if ((bus_space_read_4(sc->sc_iot, sc->sc_ioh, AMDPM_RNGSTAT) &
 221             AMDPM_RNGDONE) != 0) {
 222                 rngreg = bus_space_read_4(sc->sc_iot, sc->sc_ioh,
 223                     AMDPM_RNGDATA);
 224                 rnd_add_data(&sc->sc_rnd_source, &rngreg,
 225                     sizeof(rngreg), sizeof(rngreg) * NBBY);
 226 #ifdef AMDPM_RND_COUNTERS
 227                 AMDPM_RNDCNT_INCR(&sc->sc_rnd_hits);
 228                 for (i = 0; i < sizeof(rngreg); i++, rngreg >>= NBBY)
 229                         AMDPM_RNDCNT_INCR(&sc->sc_rnd_data[rngreg & 0xff]);
 230 #endif
 231         }
 232 #ifdef AMDPM_RND_COUNTERS
 233         else
 234                 AMDPM_RNDCNT_INCR(&sc->sc_rnd_miss);
 235 #endif
 236         callout_reset(&sc->sc_rnd_ch, 1, amdpm_rnd_callout, sc);
 237 }