1 /* $NetBSD: amdpm.c,v 1.4 2002/10/02 16:51:01 thorpej 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 1.4 2002/10/02 16:51:01 thorpej 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 int amdpm_match(struct device *, struct cfdata *, void *); 76 void amdpm_attach(struct device *, struct device *, void *); 77 void amdpm_rnd_callout(void *); 78 79 CFATTACH_DECL(amdpm, sizeof(struct amdpm_softc), 80 amdpm_match, amdpm_attach, NULL, NULL); 81 82 #ifdef AMDPM_RND_COUNTERS 83 #define AMDPM_RNDCNT_INCR(ev) (ev)->ev_count++ 84 #else 85 #define AMDPM_RNDCNT_INCR(ev) /* nothing */ 86 #endif 87 88 int 89 amdpm_match(struct device *parent, struct cfdata *match, void *aux) 90 { 91 struct pci_attach_args *pa = aux; 92 93 if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_AMD && 94 PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_PBC768_PMC) 95 return (1); 96 return (0); 97 } 98 99 void 100 amdpm_attach(struct device *parent, struct device *self, void *aux) 101 { 102 struct amdpm_softc *sc = (struct amdpm_softc *) self; 103 struct pci_attach_args *pa = aux; 104 pcireg_t reg; 105 u_int32_t pmreg; 106 int i; 107 108 printf("\n"); 109 110 sc->sc_pc = pa->pa_pc; 111 sc->sc_tag = pa->pa_tag; 112 sc->sc_iot = pa->pa_iot; 113 114 #if 0 115 printf("%s: ", sc->sc_dev.dv_xname); 116 pci_conf_print(pa->pa_pc, pa->pa_tag, NULL); 117 #endif 118 119 reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG); 120 if ((reg & AMDPM_PMIOEN) == 0) { 121 printf("%s: PMxx space isn't enabled\n", sc->sc_dev.dv_xname); 122 return; 123 } 124 reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_PMPTR); 125 if (bus_space_map(sc->sc_iot, AMDPM_PMBASE(reg), AMDPM_PMSIZE, 126 0, &sc->sc_ioh)) { 127 printf("%s: failed to map PMxx space\n", sc->sc_dev.dv_xname); 128 return; 129 } 130 131 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 printf("%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 * We can't estimate entropy since we poll 152 * random data periodically. 153 */ 154 RND_FLAG_NO_ESTIMATE); 155 #ifdef AMDPM_RND_COUNTERS 156 evcnt_attach_dynamic(&sc->sc_rnd_hits, EVCNT_TYPE_MISC, 157 NULL, sc->sc_dev.dv_xname, "rnd hits"); 158 evcnt_attach_dynamic(&sc->sc_rnd_miss, EVCNT_TYPE_MISC, 159 NULL, sc->sc_dev.dv_xname, "rnd miss"); 160 for (i = 0; i < 256; i++) { 161 evcnt_attach_dynamic(&sc->sc_rnd_data[i], 162 EVCNT_TYPE_MISC, NULL, sc->sc_dev.dv_xname, 163 "rnd data"); 164 } 165 #endif 166 amdpm_rnd_callout(sc); 167 } 168 } 169 } 170 171 void 172 amdpm_rnd_callout(void *v) 173 { 174 struct amdpm_softc *sc = v; 175 u_int32_t reg; 176 #ifdef AMDPM_RND_COUNTERS 177 int i; 178 #endif 179 180 if ((bus_space_read_4(sc->sc_iot, sc->sc_ioh, AMDPM_RNGSTAT) & 181 AMDPM_RNGDONE) != 0) { 182 reg = bus_space_read_4(sc->sc_iot, sc->sc_ioh, AMDPM_RNGDATA); 183 rnd_add_data(&sc->sc_rnd_source, ®, 184 sizeof(reg), sizeof(reg) * NBBY); 185 #ifdef AMDPM_RND_COUNTERS 186 AMDPM_RNDCNT_INCR(&sc->sc_rnd_hits); 187 for (i = 0; i < sizeof(reg); i++, reg >>= NBBY) 188 AMDPM_RNDCNT_INCR(&sc->sc_rnd_data[reg & 0xff]); 189 #endif 190 } else 191 AMDPM_RNDCNT_INCR(&sc->sc_rnd_miss); 192 callout_reset(&sc->sc_rnd_ch, 1, amdpm_rnd_callout, sc); 193 } 194