amdpm.c revision 1.9
1 /* $NetBSD: amdpm.c,v 1.9 2005/12/04 17:47:33 christos 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 2005/12/04 17:47:33 christos 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/pci/pcivar.h> 52 #include <dev/pci/pcireg.h> 53 #include <dev/pci/pcidevs.h> 54 55 #include <dev/pci/amdpmreg.h> 56 57 struct amdpm_softc { 58 struct device sc_dev; 59 60 pci_chipset_tag_t sc_pc; 61 pcitag_t sc_tag; 62 63 bus_space_tag_t sc_iot; 64 bus_space_handle_t sc_ioh; /* PMxx space */ 65 66 struct callout sc_rnd_ch; 67 rndsource_element_t sc_rnd_source; 68 #ifdef AMDPM_RND_COUNTERS 69 struct evcnt sc_rnd_hits; 70 struct evcnt sc_rnd_miss; 71 struct evcnt sc_rnd_data[256]; 72 #endif 73 }; 74 75 static void amdpm_rnd_callout(void *); 76 77 #ifdef AMDPM_RND_COUNTERS 78 #define AMDPM_RNDCNT_INCR(ev) (ev)->ev_count++ 79 #else 80 #define AMDPM_RNDCNT_INCR(ev) /* nothing */ 81 #endif 82 83 static int 84 amdpm_match(struct device *parent, struct cfdata *match, void *aux) 85 { 86 struct pci_attach_args *pa = aux; 87 88 if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_AMD && 89 PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_PBC768_PMC) 90 return (1); 91 return (0); 92 } 93 94 static void 95 amdpm_attach(struct device *parent, struct device *self, void *aux) 96 { 97 struct amdpm_softc *sc = (struct amdpm_softc *) self; 98 struct pci_attach_args *pa = aux; 99 pcireg_t reg; 100 u_int32_t pmreg; 101 int i; 102 103 aprint_naive("\n"); 104 aprint_normal("\n"); 105 106 sc->sc_pc = pa->pa_pc; 107 sc->sc_tag = pa->pa_tag; 108 sc->sc_iot = pa->pa_iot; 109 110 #if 0 111 aprint_normal("%s: ", sc->sc_dev.dv_xname); 112 pci_conf_print(pa->pa_pc, pa->pa_tag, NULL); 113 #endif 114 115 reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG); 116 if ((reg & AMDPM_PMIOEN) == 0) { 117 aprint_error("%s: PMxx space isn't enabled\n", 118 sc->sc_dev.dv_xname); 119 return; 120 } 121 reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_PMPTR); 122 if (bus_space_map(sc->sc_iot, AMDPM_PMBASE(reg), AMDPM_PMSIZE, 123 0, &sc->sc_ioh)) { 124 aprint_error("%s: failed to map PMxx space\n", 125 sc->sc_dev.dv_xname); 126 return; 127 } 128 129 reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG); 130 pci_conf_write(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG, reg | AMDPM_RNGEN); 131 reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG); 132 if (reg & AMDPM_RNGEN) { 133 /* Check to see if we can read data from the RNG. */ 134 (void) bus_space_read_4(sc->sc_iot, sc->sc_ioh, 135 AMDPM_RNGDATA); 136 for (i = 0; i < 1000; i++) { 137 pmreg = bus_space_read_4(sc->sc_iot, 138 sc->sc_ioh, AMDPM_RNGSTAT); 139 if (pmreg & AMDPM_RNGDONE) 140 break; 141 delay(1); 142 } 143 if ((pmreg & AMDPM_RNGDONE) != 0) { 144 aprint_normal("%s: " 145 "random number generator enabled (apprx. %dms)\n", 146 sc->sc_dev.dv_xname, i); 147 callout_init(&sc->sc_rnd_ch); 148 rnd_attach_source(&sc->sc_rnd_source, 149 sc->sc_dev.dv_xname, RND_TYPE_RNG, 150 /* 151 * XXX Careful! The use of RND_FLAG_NO_ESTIMATE 152 * XXX here is unobvious: we later feed raw bits 153 * XXX into the "entropy pool" with rnd_add_data, 154 * XXX explicitly supplying an entropy estimate. 155 * XXX In this context, NO_ESTIMATE serves only 156 * XXX to prevent rnd_add_data from trying to 157 * XXX use the *time at which we added the data* 158 * XXX as entropy, which is not a good idea since 159 * XXX we add data periodically from a callout. 160 */ 161 RND_FLAG_NO_ESTIMATE); 162 #ifdef AMDPM_RND_COUNTERS 163 evcnt_attach_dynamic(&sc->sc_rnd_hits, EVCNT_TYPE_MISC, 164 NULL, sc->sc_dev.dv_xname, "rnd hits"); 165 evcnt_attach_dynamic(&sc->sc_rnd_miss, EVCNT_TYPE_MISC, 166 NULL, sc->sc_dev.dv_xname, "rnd miss"); 167 for (i = 0; i < 256; i++) { 168 evcnt_attach_dynamic(&sc->sc_rnd_data[i], 169 EVCNT_TYPE_MISC, NULL, sc->sc_dev.dv_xname, 170 "rnd data"); 171 } 172 #endif 173 amdpm_rnd_callout(sc); 174 } 175 } 176 } 177 178 CFATTACH_DECL(amdpm, sizeof(struct amdpm_softc), 179 amdpm_match, amdpm_attach, NULL, NULL); 180 181 static void 182 amdpm_rnd_callout(void *v) 183 { 184 struct amdpm_softc *sc = v; 185 u_int32_t reg; 186 #ifdef AMDPM_RND_COUNTERS 187 int i; 188 #endif 189 190 if ((bus_space_read_4(sc->sc_iot, sc->sc_ioh, AMDPM_RNGSTAT) & 191 AMDPM_RNGDONE) != 0) { 192 reg = bus_space_read_4(sc->sc_iot, sc->sc_ioh, AMDPM_RNGDATA); 193 rnd_add_data(&sc->sc_rnd_source, ®, 194 sizeof(reg), sizeof(reg) * NBBY); 195 #ifdef AMDPM_RND_COUNTERS 196 AMDPM_RNDCNT_INCR(&sc->sc_rnd_hits); 197 for (i = 0; i < sizeof(reg); i++, reg >>= NBBY) 198 AMDPM_RNDCNT_INCR(&sc->sc_rnd_data[reg & 0xff]); 199 #endif 200 } else 201 AMDPM_RNDCNT_INCR(&sc->sc_rnd_miss); 202 callout_reset(&sc->sc_rnd_ch, 1, amdpm_rnd_callout, sc); 203 } 204
Indexes created Wed Oct 01 07:09:59 GMT 2025