1 /* $NetBSD: amdpm.c,v 1.43 2022/03/19 11:37:06 riastradh 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 1.43 2022/03/19 11:37:06 riastradh 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/rndsource.h> 43 #include <sys/mutex.h> 44 45 #include <sys/bus.h> 46 #include <dev/ic/acpipmtimer.h> 47 48 #include <dev/i2c/i2cvar.h> 49 50 #include <dev/pci/pcivar.h> 51 #include <dev/pci/pcireg.h> 52 #include <dev/pci/pcidevs.h> 53 54 #include <dev/pci/amdpmreg.h> 55 #include <dev/pci/amdpmvar.h> 56 #include <dev/pci/amdpm_smbusreg.h> 57 58 static void amdpm_rnd_callout(void *); 59 static void amdpm_rnd_callout_locked(void *); 60 61 #ifdef AMDPM_RND_COUNTERS 62 #define AMDPM_RNDCNT_INCR(ev) (ev)->ev_count++ 63 #endif 64 65 static int 66 amdpm_match(device_t parent, cfdata_t match, void *aux) 67 { 68 struct pci_attach_args *pa = aux; 69 70 if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_AMD) { 71 switch (PCI_PRODUCT(pa->pa_id)) { 72 case PCI_PRODUCT_AMD_PBC768_PMC: 73 case PCI_PRODUCT_AMD_PBC8111_ACPI: 74 return (1); 75 } 76 } 77 if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_NVIDIA) { 78 switch (PCI_PRODUCT(pa->pa_id)) { 79 case PCI_PRODUCT_NVIDIA_XBOX_SMBUS: 80 return (1); 81 } 82 } 83 84 return (0); 85 } 86 87 static void 88 amdpm_rnd_get(size_t bytes, void *priv) 89 { 90 struct amdpm_softc *sc = priv; 91 92 mutex_enter(&sc->sc_mutex); 93 sc->sc_rnd_need = bytes; 94 amdpm_rnd_callout_locked(sc); 95 mutex_exit(&sc->sc_mutex); 96 } 97 98 static void 99 amdpm_attach(device_t parent, device_t self, void *aux) 100 { 101 struct amdpm_softc *sc = device_private(self); 102 struct pci_attach_args *pa = aux; 103 pcireg_t confreg, pmptrreg; 104 u_int32_t pmreg; 105 int i; 106 107 pci_aprint_devinfo(pa, NULL); 108 109 sc->sc_dev = self; 110 111 if (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_NVIDIA_XBOX_SMBUS) 112 sc->sc_nforce = 1; 113 else 114 sc->sc_nforce = 0; 115 116 sc->sc_pc = pa->pa_pc; 117 sc->sc_tag = pa->pa_tag; 118 sc->sc_iot = pa->pa_iot; 119 sc->sc_pa = pa; 120 121 confreg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG); 122 /* enable pm i/o space for AMD-8111 and nForce */ 123 if (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_PBC8111_ACPI || 124 sc->sc_nforce) 125 confreg |= AMDPM_PMIOEN; 126 127 /* Enable random number generation for everyone */ 128 pci_conf_write(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG, 129 confreg | AMDPM_RNGEN); 130 confreg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG); 131 132 if ((confreg & AMDPM_PMIOEN) == 0) { 133 aprint_error_dev(self, "PMxx space isn't enabled\n"); 134 return; 135 } 136 137 if (sc->sc_nforce) { 138 pmptrreg = pci_conf_read(pa->pa_pc, pa->pa_tag, NFORCE_PMPTR); 139 aprint_normal_dev(self, "power management at 0x%04x\n", 140 NFORCE_PMBASE(pmptrreg)); 141 if (bus_space_map(sc->sc_iot, NFORCE_PMBASE(pmptrreg), 142 AMDPM_PMSIZE, 0, &sc->sc_ioh)) { 143 aprint_error_dev(self, "failed to map PMxx space\n"); 144 return; 145 } 146 } else { 147 pmptrreg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_PMPTR); 148 if (bus_space_map(sc->sc_iot, AMDPM_PMBASE(pmptrreg), 149 AMDPM_PMSIZE, 0, &sc->sc_ioh)) { 150 aprint_error_dev(self, "failed to map PMxx space\n"); 151 return; 152 } 153 } 154 155 /* don't attach a timecounter on nforce boards */ 156 if ((confreg & AMDPM_TMRRST) == 0 && (confreg & AMDPM_STOPTMR) == 0 && 157 !sc->sc_nforce) { 158 acpipmtimer_attach(self, sc->sc_iot, sc->sc_ioh, 159 AMDPM_TMR, ((confreg & AMDPM_TMR32) ? ACPIPMT_32BIT : 0)); 160 } 161 162 mutex_init(&sc->sc_mutex, MUTEX_DEFAULT, IPL_SOFTSERIAL); 163 164 /* try to attach devices on the smbus */ 165 if (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_PBC8111_ACPI || 166 PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_PBC768_PMC || 167 sc->sc_nforce) { 168 amdpm_smbus_attach(sc); 169 } 170 171 if (confreg & AMDPM_RNGEN) { 172 /* Check to see if we can read data from the RNG. */ 173 (void) bus_space_read_4(sc->sc_iot, sc->sc_ioh, 174 AMDPM_RNGDATA); 175 for (i = 0; i < 1000; i++) { 176 pmreg = bus_space_read_4(sc->sc_iot, 177 sc->sc_ioh, AMDPM_RNGSTAT); 178 if (pmreg & AMDPM_RNGDONE) 179 break; 180 delay(1); 181 } 182 if ((pmreg & AMDPM_RNGDONE) != 0) { 183 aprint_normal_dev(self, "" 184 "random number generator enabled (apprx. %dms)\n", 185 i); 186 callout_init(&sc->sc_rnd_ch, CALLOUT_MPSAFE); 187 #ifdef AMDPM_RND_COUNTERS 188 evcnt_attach_dynamic(&sc->sc_rnd_hits, EVCNT_TYPE_MISC, 189 NULL, device_xname(self), "rnd hits"); 190 evcnt_attach_dynamic(&sc->sc_rnd_miss, EVCNT_TYPE_MISC, 191 NULL, device_xname(self), "rnd miss"); 192 for (i = 0; i < 256; i++) { 193 evcnt_attach_dynamic(&sc->sc_rnd_data[i], 194 EVCNT_TYPE_MISC, NULL, device_xname(self), 195 "rnd data"); 196 } 197 #endif 198 rndsource_setcb(&sc->sc_rnd_source, 199 amdpm_rnd_get, sc); 200 rnd_attach_source(&sc->sc_rnd_source, 201 device_xname(self), RND_TYPE_RNG, 202 RND_FLAG_COLLECT_VALUE|RND_FLAG_HASCB); 203 } 204 } 205 } 206 207 CFATTACH_DECL_NEW(amdpm, sizeof(struct amdpm_softc), 208 amdpm_match, amdpm_attach, NULL, NULL); 209 210 static void 211 amdpm_rnd_callout_locked(void *v) 212 { 213 struct amdpm_softc *sc = v; 214 u_int32_t rngreg; 215 #ifdef AMDPM_RND_COUNTERS 216 int i; 217 #endif 218 219 if (sc->sc_rnd_need < 1) { 220 callout_stop(&sc->sc_rnd_ch); 221 return; 222 } 223 224 if ((bus_space_read_4(sc->sc_iot, sc->sc_ioh, AMDPM_RNGSTAT) & 225 AMDPM_RNGDONE) != 0) { 226 rngreg = bus_space_read_4(sc->sc_iot, sc->sc_ioh, 227 AMDPM_RNGDATA); 228 rnd_add_data(&sc->sc_rnd_source, &rngreg, 229 sizeof(rngreg), sizeof(rngreg) * NBBY); 230 sc->sc_rnd_need -= sizeof(rngreg); 231 #ifdef AMDPM_RND_COUNTERS 232 AMDPM_RNDCNT_INCR(&sc->sc_rnd_hits); 233 for (i = 0; i < sizeof(rngreg); i++, rngreg >>= NBBY) 234 AMDPM_RNDCNT_INCR(&sc->sc_rnd_data[rngreg & 0xff]); 235 #endif 236 } 237 #ifdef AMDPM_RND_COUNTERS 238 else 239 AMDPM_RNDCNT_INCR(&sc->sc_rnd_miss); 240 #endif 241 if (sc->sc_rnd_need > 0) { 242 callout_reset(&sc->sc_rnd_ch, 1, amdpm_rnd_callout, sc); 243 } 244 } 245 246 static void 247 amdpm_rnd_callout(void *v) 248 { 249 struct amdpm_softc *sc = v; 250 251 mutex_enter(&sc->sc_mutex); 252 amdpm_rnd_callout_locked(v); 253 mutex_exit(&sc->sc_mutex); 254 } 255