amdpm.c revision 1.19.4.1
1 /* $NetBSD: amdpm.c,v 1.19.4.1 2006/10/22 06:06:15 yamt 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 1.19.4.1 2006/10/22 06:06:15 yamt 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 #ifdef __HAVE_TIMECOUNTER 52 #include <machine/bus.h> 53 #include <dev/ic/acpipmtimer.h> 54 #endif 55 56 #include <dev/i2c/i2cvar.h> 57 58 #include <dev/pci/pcivar.h> 59 #include <dev/pci/pcireg.h> 60 #include <dev/pci/pcidevs.h> 61 62 #include <dev/pci/amdpmreg.h> 63 #include <dev/pci/amdpmvar.h> 64 #include <dev/pci/amdpm_smbusreg.h> 65 66 static void amdpm_rnd_callout(void *); 67 68 #ifdef AMDPM_RND_COUNTERS 69 #define AMDPM_RNDCNT_INCR(ev) (ev)->ev_count++ 70 #endif 71 72 static int 73 amdpm_match(struct device *parent __unused, struct cfdata *match __unused, 74 void *aux) 75 { 76 struct pci_attach_args *pa = aux; 77 78 if (PCI_VENDOR(pa->pa_id) != PCI_VENDOR_AMD) 79 return (0); 80 81 switch (PCI_PRODUCT(pa->pa_id)) { 82 case PCI_PRODUCT_AMD_PBC768_PMC: 83 case PCI_PRODUCT_AMD_PBC8111_ACPI: 84 return (1); 85 } 86 87 return (0); 88 } 89 90 static void 91 amdpm_attach(struct device *parent __unused, struct device *self, void *aux) 92 { 93 struct amdpm_softc *sc = (struct amdpm_softc *) self; 94 struct pci_attach_args *pa = aux; 95 char devinfo[256]; 96 pcireg_t confreg, pmptrreg; 97 u_int32_t pmreg; 98 int i; 99 100 aprint_naive("\n"); 101 pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo, sizeof(devinfo)); 102 aprint_normal(": %s (rev. 0x%02x)\n", devinfo, 103 PCI_REVISION(pa->pa_class)); 104 105 sc->sc_pc = pa->pa_pc; 106 sc->sc_tag = pa->pa_tag; 107 sc->sc_iot = pa->pa_iot; 108 109 #if 0 110 aprint_normal("%s: ", sc->sc_dev.dv_xname); 111 pci_conf_print(pa->pa_pc, pa->pa_tag, NULL); 112 #endif 113 114 confreg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG); 115 /* enable pm i/o space for AMD-8111 */ 116 if (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_PBC8111_ACPI) 117 confreg |= AMDPM_PMIOEN; 118 119 /* Enable random number generation for everyone */ 120 pci_conf_write(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG, 121 confreg | AMDPM_RNGEN); 122 confreg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG); 123 124 if ((confreg & AMDPM_PMIOEN) == 0) { 125 aprint_error("%s: PMxx space isn't enabled\n", 126 sc->sc_dev.dv_xname); 127 return; 128 } 129 130 pmptrreg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_PMPTR); 131 if (bus_space_map(sc->sc_iot, AMDPM_PMBASE(pmptrreg), AMDPM_PMSIZE, 132 0, &sc->sc_ioh)) { 133 aprint_error("%s: failed to map PMxx space\n", 134 sc->sc_dev.dv_xname); 135 return; 136 } 137 138 #ifdef __HAVE_TIMECOUNTER 139 if ((confreg & AMDPM_TMRRST) == 0 && (confreg & AMDPM_STOPTMR) == 0) { 140 acpipmtimer_attach(&sc->sc_dev, sc->sc_iot, sc->sc_ioh, 141 AMDPM_TMR, ((confreg & AMDPM_TMR32) ? ACPIPMT_32BIT : 0)); 142 } 143 #endif 144 145 /* try to attach devices on the smbus */ 146 if (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_PBC8111_ACPI) { 147 amdpm_smbus_attach(sc); 148 } 149 150 if (confreg & AMDPM_RNGEN) { 151 /* Check to see if we can read data from the RNG. */ 152 (void) bus_space_read_4(sc->sc_iot, sc->sc_ioh, 153 AMDPM_RNGDATA); 154 for (i = 0; i < 1000; i++) { 155 pmreg = bus_space_read_4(sc->sc_iot, 156 sc->sc_ioh, AMDPM_RNGSTAT); 157 if (pmreg & AMDPM_RNGDONE) 158 break; 159 delay(1); 160 } 161 if ((pmreg & AMDPM_RNGDONE) != 0) { 162 aprint_normal("%s: " 163 "random number generator enabled (apprx. %dms)\n", 164 sc->sc_dev.dv_xname, i); 165 callout_init(&sc->sc_rnd_ch); 166 rnd_attach_source(&sc->sc_rnd_source, 167 sc->sc_dev.dv_xname, RND_TYPE_RNG, 168 /* 169 * XXX Careful! The use of RND_FLAG_NO_ESTIMATE 170 * XXX here is unobvious: we later feed raw bits 171 * XXX into the "entropy pool" with rnd_add_data, 172 * XXX explicitly supplying an entropy estimate. 173 * XXX In this context, NO_ESTIMATE serves only 174 * XXX to prevent rnd_add_data from trying to 175 * XXX use the *time at which we added the data* 176 * XXX as entropy, which is not a good idea since 177 * XXX we add data periodically from a callout. 178 */ 179 RND_FLAG_NO_ESTIMATE); 180 #ifdef AMDPM_RND_COUNTERS 181 evcnt_attach_dynamic(&sc->sc_rnd_hits, EVCNT_TYPE_MISC, 182 NULL, sc->sc_dev.dv_xname, "rnd hits"); 183 evcnt_attach_dynamic(&sc->sc_rnd_miss, EVCNT_TYPE_MISC, 184 NULL, sc->sc_dev.dv_xname, "rnd miss"); 185 for (i = 0; i < 256; i++) { 186 evcnt_attach_dynamic(&sc->sc_rnd_data[i], 187 EVCNT_TYPE_MISC, NULL, sc->sc_dev.dv_xname, 188 "rnd data"); 189 } 190 #endif 191 amdpm_rnd_callout(sc); 192 } 193 } 194 } 195 196 CFATTACH_DECL(amdpm, sizeof(struct amdpm_softc), 197 amdpm_match, amdpm_attach, NULL, NULL); 198 199 static void 200 amdpm_rnd_callout(void *v) 201 { 202 struct amdpm_softc *sc = v; 203 u_int32_t rngreg; 204 #ifdef AMDPM_RND_COUNTERS 205 int i; 206 #endif 207 208 if ((bus_space_read_4(sc->sc_iot, sc->sc_ioh, AMDPM_RNGSTAT) & 209 AMDPM_RNGDONE) != 0) { 210 rngreg = bus_space_read_4(sc->sc_iot, sc->sc_ioh, 211 AMDPM_RNGDATA); 212 rnd_add_data(&sc->sc_rnd_source, &rngreg, 213 sizeof(rngreg), sizeof(rngreg) * NBBY); 214 #ifdef AMDPM_RND_COUNTERS 215 AMDPM_RNDCNT_INCR(&sc->sc_rnd_hits); 216 for (i = 0; i < sizeof(rngreg); i++, rngreg >>= NBBY) 217 AMDPM_RNDCNT_INCR(&sc->sc_rnd_data[rngreg & 0xff]); 218 #endif 219 } 220 #ifdef AMDPM_RND_COUNTERS 221 else 222 AMDPM_RNDCNT_INCR(&sc->sc_rnd_miss); 223 #endif 224 callout_reset(&sc->sc_rnd_ch, 1, amdpm_rnd_callout, sc); 225 } 226
Indexes created Wed Oct 01 07:09:59 GMT 2025