amdpm.c revision 1.9.2.2
1 /* $NetBSD: amdpm.c,v 1.9.2.2 2006/03/01 09:28:21 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 1.9.2.2 2006/03/01 09:28:21 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 #include <dev/i2c/i2cvar.h> 52 53 #include <dev/pci/pcivar.h> 54 #include <dev/pci/pcireg.h> 55 #include <dev/pci/pcidevs.h> 56 57 #include <dev/pci/amdpmreg.h> 58 #include <dev/pci/amdpmvar.h> 59 #include <dev/pci/amdpm_smbusreg.h> 60 61 static void amdpm_rnd_callout(void *); 62 63 #ifdef AMDPM_RND_COUNTERS 64 #define AMDPM_RNDCNT_INCR(ev) (ev)->ev_count++ 65 #else 66 #define AMDPM_RNDCNT_INCR(ev) /* nothing */ 67 #endif 68 69 static int 70 amdpm_match(struct device *parent, struct cfdata *match, void *aux) 71 { 72 struct pci_attach_args *pa = aux; 73 74 if (PCI_VENDOR(pa->pa_id) != PCI_VENDOR_AMD) 75 return (0); 76 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 return (0); 84 } 85 86 static void 87 amdpm_attach(struct device *parent, struct device *self, void *aux) 88 { 89 struct amdpm_softc *sc = (struct amdpm_softc *) self; 90 struct pci_attach_args *pa = aux; 91 char devinfo[256]; 92 pcireg_t reg; 93 u_int32_t pmreg; 94 int i; 95 96 aprint_naive("\n"); 97 pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo, sizeof(devinfo)); 98 aprint_normal(": %s (rev. 0x%02x)\n", devinfo, 99 PCI_REVISION(pa->pa_class)); 100 101 sc->sc_pc = pa->pa_pc; 102 sc->sc_tag = pa->pa_tag; 103 sc->sc_iot = pa->pa_iot; 104 105 #if 0 106 aprint_normal("%s: ", sc->sc_dev.dv_xname); 107 pci_conf_print(pa->pa_pc, pa->pa_tag, NULL); 108 #endif 109 110 /* enable random # generation and pm i/o space for AMD-8111 */ 111 if (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_PBC8111_ACPI) { 112 reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG); 113 pci_conf_write(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG, reg| 114 AMDPM_RNGEN|AMDPM_PMIOEN); 115 } 116 117 reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG); 118 if ((reg & AMDPM_PMIOEN) == 0) { 119 aprint_error("%s: PMxx space isn't enabled\n", 120 sc->sc_dev.dv_xname); 121 return; 122 } 123 reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_PMPTR); 124 if (bus_space_map(sc->sc_iot, AMDPM_PMBASE(reg), AMDPM_PMSIZE, 125 0, &sc->sc_ioh)) { 126 aprint_error("%s: failed to map PMxx space\n", 127 sc->sc_dev.dv_xname); 128 return; 129 } 130 131 /* try to attach devices on the smbus */ 132 if (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_PBC8111_ACPI) { 133 amdpm_smbus_attach(sc); 134 } 135 136 reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG); 137 pci_conf_write(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG, reg | AMDPM_RNGEN); 138 reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG); 139 if (reg & AMDPM_RNGEN) { 140 /* Check to see if we can read data from the RNG. */ 141 (void) bus_space_read_4(sc->sc_iot, sc->sc_ioh, 142 AMDPM_RNGDATA); 143 for (i = 0; i < 1000; i++) { 144 pmreg = bus_space_read_4(sc->sc_iot, 145 sc->sc_ioh, AMDPM_RNGSTAT); 146 if (pmreg & AMDPM_RNGDONE) 147 break; 148 delay(1); 149 } 150 if ((pmreg & AMDPM_RNGDONE) != 0) { 151 aprint_normal("%s: " 152 "random number generator enabled (apprx. %dms)\n", 153 sc->sc_dev.dv_xname, i); 154 callout_init(&sc->sc_rnd_ch); 155 rnd_attach_source(&sc->sc_rnd_source, 156 sc->sc_dev.dv_xname, RND_TYPE_RNG, 157 /* 158 * XXX Careful! The use of RND_FLAG_NO_ESTIMATE 159 * XXX here is unobvious: we later feed raw bits 160 * XXX into the "entropy pool" with rnd_add_data, 161 * XXX explicitly supplying an entropy estimate. 162 * XXX In this context, NO_ESTIMATE serves only 163 * XXX to prevent rnd_add_data from trying to 164 * XXX use the *time at which we added the data* 165 * XXX as entropy, which is not a good idea since 166 * XXX we add data periodically from a callout. 167 */ 168 RND_FLAG_NO_ESTIMATE); 169 #ifdef AMDPM_RND_COUNTERS 170 evcnt_attach_dynamic(&sc->sc_rnd_hits, EVCNT_TYPE_MISC, 171 NULL, sc->sc_dev.dv_xname, "rnd hits"); 172 evcnt_attach_dynamic(&sc->sc_rnd_miss, EVCNT_TYPE_MISC, 173 NULL, sc->sc_dev.dv_xname, "rnd miss"); 174 for (i = 0; i < 256; i++) { 175 evcnt_attach_dynamic(&sc->sc_rnd_data[i], 176 EVCNT_TYPE_MISC, NULL, sc->sc_dev.dv_xname, 177 "rnd data"); 178 } 179 #endif 180 amdpm_rnd_callout(sc); 181 } 182 } 183 } 184 185 CFATTACH_DECL(amdpm, sizeof(struct amdpm_softc), 186 amdpm_match, amdpm_attach, NULL, NULL); 187 188 static void 189 amdpm_rnd_callout(void *v) 190 { 191 struct amdpm_softc *sc = v; 192 u_int32_t reg; 193 #ifdef AMDPM_RND_COUNTERS 194 int i; 195 #endif 196 197 if ((bus_space_read_4(sc->sc_iot, sc->sc_ioh, AMDPM_RNGSTAT) & 198 AMDPM_RNGDONE) != 0) { 199 reg = bus_space_read_4(sc->sc_iot, sc->sc_ioh, AMDPM_RNGDATA); 200 rnd_add_data(&sc->sc_rnd_source, ®, 201 sizeof(reg), sizeof(reg) * NBBY); 202 #ifdef AMDPM_RND_COUNTERS 203 AMDPM_RNDCNT_INCR(&sc->sc_rnd_hits); 204 for (i = 0; i < sizeof(reg); i++, reg >>= NBBY) 205 AMDPM_RNDCNT_INCR(&sc->sc_rnd_data[reg & 0xff]); 206 #endif 207 } else 208 AMDPM_RNDCNT_INCR(&sc->sc_rnd_miss); 209 callout_reset(&sc->sc_rnd_ch, 1, amdpm_rnd_callout, sc); 210 } 211
Indexes created Wed Oct 01 07:09:59 GMT 2025