1 /* $NetBSD: amdpm.c,v 1.29 2008/04/10 19:13:36 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: amdpm.c,v 1.29 2008/04/10 19:13:36 cegger Exp $"); 41 42 #include "opt_amdpm.h" 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/kernel.h> 47 #include <sys/device.h> 48 #include <sys/callout.h> 49 #include <sys/rnd.h> 50 51 #include <sys/bus.h> 52 #include <dev/ic/acpipmtimer.h> 53 54 #include <dev/i2c/i2cvar.h> 55 56 #include <dev/pci/pcivar.h> 57 #include <dev/pci/pcireg.h> 58 #include <dev/pci/pcidevs.h> 59 60 #include <dev/pci/amdpmreg.h> 61 #include <dev/pci/amdpmvar.h> 62 #include <dev/pci/amdpm_smbusreg.h> 63 64 static void amdpm_rnd_callout(void *); 65 66 #ifdef AMDPM_RND_COUNTERS 67 #define AMDPM_RNDCNT_INCR(ev) (ev)->ev_count++ 68 #endif 69 70 static int 71 amdpm_match(struct device *parent, struct cfdata *match, 72 void *aux) 73 { 74 struct pci_attach_args *pa = aux; 75 76 if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_AMD) { 77 switch (PCI_PRODUCT(pa->pa_id)) { 78 case PCI_PRODUCT_AMD_PBC768_PMC: 79 case PCI_PRODUCT_AMD_PBC8111_ACPI: 80 return (1); 81 } 82 } 83 if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_NVIDIA) { 84 switch (PCI_PRODUCT(pa->pa_id)) { 85 case PCI_PRODUCT_NVIDIA_XBOX_SMBUS: 86 return (1); 87 } 88 } 89 90 return (0); 91 } 92 93 static void 94 amdpm_attach(struct device *parent, struct device *self, void *aux) 95 { 96 struct amdpm_softc *sc = (struct amdpm_softc *) self; 97 struct pci_attach_args *pa = aux; 98 char devinfo[256]; 99 pcireg_t confreg, pmptrreg; 100 u_int32_t pmreg; 101 int i; 102 103 aprint_naive("\n"); 104 pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo, sizeof(devinfo)); 105 aprint_normal(": %s (rev. 0x%02x)\n", devinfo, 106 PCI_REVISION(pa->pa_class)); 107 108 if (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_NVIDIA_XBOX_SMBUS) 109 sc->sc_nforce = 1; 110 else 111 sc->sc_nforce = 0; 112 113 sc->sc_pc = pa->pa_pc; 114 sc->sc_tag = pa->pa_tag; 115 sc->sc_iot = pa->pa_iot; 116 sc->sc_pa = pa; 117 118 #if 0 119 aprint_normal_dev(&sc->sc_dev, ""); 120 pci_conf_print(pa->pa_pc, pa->pa_tag, NULL); 121 #endif 122 123 confreg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG); 124 /* enable pm i/o space for AMD-8111 and nForce */ 125 if (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_PBC8111_ACPI || 126 sc->sc_nforce) 127 confreg |= AMDPM_PMIOEN; 128 129 /* Enable random number generation for everyone */ 130 pci_conf_write(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG, 131 confreg | AMDPM_RNGEN); 132 confreg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG); 133 134 if ((confreg & AMDPM_PMIOEN) == 0) { 135 aprint_error_dev(&sc->sc_dev, "PMxx space isn't enabled\n"); 136 return; 137 } 138 139 if (sc->sc_nforce) { 140 pmptrreg = pci_conf_read(pa->pa_pc, pa->pa_tag, NFORCE_PMPTR); 141 aprint_normal_dev(&sc->sc_dev, "power management at 0x%04x\n", 142 NFORCE_PMBASE(pmptrreg)); 143 if (bus_space_map(sc->sc_iot, NFORCE_PMBASE(pmptrreg), 144 AMDPM_PMSIZE, 0, &sc->sc_ioh)) { 145 aprint_error_dev(&sc->sc_dev, "failed to map PMxx space\n"); 146 return; 147 } 148 } else { 149 pmptrreg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_PMPTR); 150 if (bus_space_map(sc->sc_iot, AMDPM_PMBASE(pmptrreg), 151 AMDPM_PMSIZE, 0, &sc->sc_ioh)) { 152 aprint_error_dev(&sc->sc_dev, "failed to map PMxx space\n"); 153 return; 154 } 155 } 156 157 /* don't attach a timecounter on nforce boards */ 158 if ((confreg & AMDPM_TMRRST) == 0 && (confreg & AMDPM_STOPTMR) == 0 && 159 !sc->sc_nforce) { 160 acpipmtimer_attach(&sc->sc_dev, sc->sc_iot, sc->sc_ioh, 161 AMDPM_TMR, ((confreg & AMDPM_TMR32) ? ACPIPMT_32BIT : 0)); 162 } 163 164 /* try to attach devices on the smbus */ 165 if (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_PBC8111_ACPI || 166 sc->sc_nforce) { 167 amdpm_smbus_attach(sc); 168 } 169 170 if (confreg & AMDPM_RNGEN) { 171 /* Check to see if we can read data from the RNG. */ 172 (void) bus_space_read_4(sc->sc_iot, sc->sc_ioh, 173 AMDPM_RNGDATA); 174 for (i = 0; i < 1000; i++) { 175 pmreg = bus_space_read_4(sc->sc_iot, 176 sc->sc_ioh, AMDPM_RNGSTAT); 177 if (pmreg & AMDPM_RNGDONE) 178 break; 179 delay(1); 180 } 181 if ((pmreg & AMDPM_RNGDONE) != 0) { 182 aprint_normal_dev(&sc->sc_dev, "" 183 "random number generator enabled (apprx. %dms)\n", 184 i); 185 callout_init(&sc->sc_rnd_ch, 0); 186 rnd_attach_source(&sc->sc_rnd_source, 187 device_xname(&sc->sc_dev), RND_TYPE_RNG, 188 /* 189 * XXX Careful! The use of RND_FLAG_NO_ESTIMATE 190 * XXX here is unobvious: we later feed raw bits 191 * XXX into the "entropy pool" with rnd_add_data, 192 * XXX explicitly supplying an entropy estimate. 193 * XXX In this context, NO_ESTIMATE serves only 194 * XXX to prevent rnd_add_data from trying to 195 * XXX use the *time at which we added the data* 196 * XXX as entropy, which is not a good idea since 197 * XXX we add data periodically from a callout. 198 */ 199 RND_FLAG_NO_ESTIMATE); 200 #ifdef AMDPM_RND_COUNTERS 201 evcnt_attach_dynamic(&sc->sc_rnd_hits, EVCNT_TYPE_MISC, 202 NULL, device_xname(&sc->sc_dev), "rnd hits"); 203 evcnt_attach_dynamic(&sc->sc_rnd_miss, EVCNT_TYPE_MISC, 204 NULL, device_xname(&sc->sc_dev), "rnd miss"); 205 for (i = 0; i < 256; i++) { 206 evcnt_attach_dynamic(&sc->sc_rnd_data[i], 207 EVCNT_TYPE_MISC, NULL, device_xname(&sc->sc_dev), 208 "rnd data"); 209 } 210 #endif 211 amdpm_rnd_callout(sc); 212 } 213 } 214 } 215 216 CFATTACH_DECL(amdpm, sizeof(struct amdpm_softc), 217 amdpm_match, amdpm_attach, NULL, NULL); 218 219 static void 220 amdpm_rnd_callout(void *v) 221 { 222 struct amdpm_softc *sc = v; 223 u_int32_t rngreg; 224 #ifdef AMDPM_RND_COUNTERS 225 int i; 226 #endif 227 228 if ((bus_space_read_4(sc->sc_iot, sc->sc_ioh, AMDPM_RNGSTAT) & 229 AMDPM_RNGDONE) != 0) { 230 rngreg = bus_space_read_4(sc->sc_iot, sc->sc_ioh, 231 AMDPM_RNGDATA); 232 rnd_add_data(&sc->sc_rnd_source, &rngreg, 233 sizeof(rngreg), sizeof(rngreg) * NBBY); 234 #ifdef AMDPM_RND_COUNTERS 235 AMDPM_RNDCNT_INCR(&sc->sc_rnd_hits); 236 for (i = 0; i < sizeof(rngreg); i++, rngreg >>= NBBY) 237 AMDPM_RNDCNT_INCR(&sc->sc_rnd_data[rngreg & 0xff]); 238 #endif 239 } 240 #ifdef AMDPM_RND_COUNTERS 241 else 242 AMDPM_RNDCNT_INCR(&sc->sc_rnd_miss); 243 #endif 244 callout_reset(&sc->sc_rnd_ch, 1, amdpm_rnd_callout, sc); 245 } 246