1 /* $NetBSD: amdpm.c,v 1.14 2006/06/21 21:09:36 explorer 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 1.14 2006/06/21 21:09:36 explorer 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 <sys/timetc.h> 53 #include <machine/bus.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 __HAVE_TIMECOUNTER 69 uint32_t amdpm_get_timecount(struct timecounter *); 70 71 #ifndef AMDPM_FREQUENCY 72 #define AMDPM_FREQUENCY 3579545 73 #endif 74 75 static struct timecounter amdpm_timecounter = { 76 amdpm_get_timecount, 77 0, 78 0xffffff, 79 AMDPM_FREQUENCY, 80 "amdpm", 81 1000 82 }; 83 #endif 84 85 #ifdef AMDPM_RND_COUNTERS 86 #define AMDPM_RNDCNT_INCR(ev) (ev)->ev_count++ 87 #else 88 #define AMDPM_RNDCNT_INCR(ev) /* nothing */ 89 #endif 90 91 static int 92 amdpm_match(struct device *parent, struct cfdata *match, void *aux) 93 { 94 struct pci_attach_args *pa = aux; 95 96 if (PCI_VENDOR(pa->pa_id) != PCI_VENDOR_AMD) 97 return (0); 98 99 switch (PCI_PRODUCT(pa->pa_id)) { 100 case PCI_PRODUCT_AMD_PBC768_PMC: 101 case PCI_PRODUCT_AMD_PBC8111_ACPI: 102 return (1); 103 } 104 105 return (0); 106 } 107 108 static void 109 amdpm_attach(struct device *parent, struct device *self, void *aux) 110 { 111 struct amdpm_softc *sc = (struct amdpm_softc *) self; 112 struct pci_attach_args *pa = aux; 113 char devinfo[256]; 114 pcireg_t reg; 115 u_int32_t pmreg; 116 int i; 117 118 aprint_naive("\n"); 119 pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo, sizeof(devinfo)); 120 aprint_normal(": %s (rev. 0x%02x)\n", devinfo, 121 PCI_REVISION(pa->pa_class)); 122 123 sc->sc_pc = pa->pa_pc; 124 sc->sc_tag = pa->pa_tag; 125 sc->sc_iot = pa->pa_iot; 126 127 #if 0 128 aprint_normal("%s: ", sc->sc_dev.dv_xname); 129 pci_conf_print(pa->pa_pc, pa->pa_tag, NULL); 130 #endif 131 132 /* enable random # generation and pm i/o space for AMD-8111 */ 133 if (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_PBC8111_ACPI) { 134 reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG); 135 pci_conf_write(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG, reg| 136 AMDPM_RNGEN|AMDPM_PMIOEN); 137 } 138 139 reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG); 140 if ((reg & AMDPM_PMIOEN) == 0) { 141 aprint_error("%s: PMxx space isn't enabled\n", 142 sc->sc_dev.dv_xname); 143 return; 144 } 145 reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_PMPTR); 146 if (bus_space_map(sc->sc_iot, AMDPM_PMBASE(reg), AMDPM_PMSIZE, 147 0, &sc->sc_ioh)) { 148 aprint_error("%s: failed to map PMxx space\n", 149 sc->sc_dev.dv_xname); 150 return; 151 } 152 153 #ifdef __HAVE_TIMECOUNTER 154 if ((reg & AMDPM_TMRRST) == 0 && (reg & AMDPM_STOPTMR) == 0 && 155 PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_PBC768_PMC) { 156 aprint_normal("%s: %d-bit timer at %" PRIu64 "Hz\n", 157 sc->sc_dev.dv_xname, 158 (reg & AMDPM_TMR32) ? 32 : 24, 159 amdpm_timecounter.tc_frequency); 160 161 amdpm_timecounter.tc_priv = sc; 162 if (reg & AMDPM_TMR32) 163 amdpm_timecounter.tc_counter_mask = 0xffffffffu; 164 tc_init(&amdpm_timecounter); 165 } 166 #endif 167 168 /* try to attach devices on the smbus */ 169 if (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_PBC8111_ACPI) { 170 amdpm_smbus_attach(sc); 171 } 172 173 reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG); 174 pci_conf_write(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG, reg | AMDPM_RNGEN); 175 reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG); 176 if (reg & AMDPM_RNGEN) { 177 /* Check to see if we can read data from the RNG. */ 178 (void) bus_space_read_4(sc->sc_iot, sc->sc_ioh, 179 AMDPM_RNGDATA); 180 for (i = 0; i < 1000; i++) { 181 pmreg = bus_space_read_4(sc->sc_iot, 182 sc->sc_ioh, AMDPM_RNGSTAT); 183 if (pmreg & AMDPM_RNGDONE) 184 break; 185 delay(1); 186 } 187 if ((pmreg & AMDPM_RNGDONE) != 0) { 188 aprint_normal("%s: " 189 "random number generator enabled (apprx. %dms)\n", 190 sc->sc_dev.dv_xname, i); 191 callout_init(&sc->sc_rnd_ch); 192 rnd_attach_source(&sc->sc_rnd_source, 193 sc->sc_dev.dv_xname, RND_TYPE_RNG, 194 /* 195 * XXX Careful! The use of RND_FLAG_NO_ESTIMATE 196 * XXX here is unobvious: we later feed raw bits 197 * XXX into the "entropy pool" with rnd_add_data, 198 * XXX explicitly supplying an entropy estimate. 199 * XXX In this context, NO_ESTIMATE serves only 200 * XXX to prevent rnd_add_data from trying to 201 * XXX use the *time at which we added the data* 202 * XXX as entropy, which is not a good idea since 203 * XXX we add data periodically from a callout. 204 */ 205 RND_FLAG_NO_ESTIMATE); 206 #ifdef AMDPM_RND_COUNTERS 207 evcnt_attach_dynamic(&sc->sc_rnd_hits, EVCNT_TYPE_MISC, 208 NULL, sc->sc_dev.dv_xname, "rnd hits"); 209 evcnt_attach_dynamic(&sc->sc_rnd_miss, EVCNT_TYPE_MISC, 210 NULL, sc->sc_dev.dv_xname, "rnd miss"); 211 for (i = 0; i < 256; i++) { 212 evcnt_attach_dynamic(&sc->sc_rnd_data[i], 213 EVCNT_TYPE_MISC, NULL, sc->sc_dev.dv_xname, 214 "rnd data"); 215 } 216 #endif 217 amdpm_rnd_callout(sc); 218 } 219 } 220 } 221 222 CFATTACH_DECL(amdpm, sizeof(struct amdpm_softc), 223 amdpm_match, amdpm_attach, NULL, NULL); 224 225 static void 226 amdpm_rnd_callout(void *v) 227 { 228 struct amdpm_softc *sc = v; 229 u_int32_t reg; 230 #ifdef AMDPM_RND_COUNTERS 231 int i; 232 #endif 233 234 if ((bus_space_read_4(sc->sc_iot, sc->sc_ioh, AMDPM_RNGSTAT) & 235 AMDPM_RNGDONE) != 0) { 236 reg = bus_space_read_4(sc->sc_iot, sc->sc_ioh, AMDPM_RNGDATA); 237 rnd_add_data(&sc->sc_rnd_source, ®, 238 sizeof(reg), sizeof(reg) * NBBY); 239 #ifdef AMDPM_RND_COUNTERS 240 AMDPM_RNDCNT_INCR(&sc->sc_rnd_hits); 241 for (i = 0; i < sizeof(reg); i++, reg >>= NBBY) 242 AMDPM_RNDCNT_INCR(&sc->sc_rnd_data[reg & 0xff]); 243 #endif 244 } else 245 AMDPM_RNDCNT_INCR(&sc->sc_rnd_miss); 246 callout_reset(&sc->sc_rnd_ch, 1, amdpm_rnd_callout, sc); 247 } 248 249 #ifdef __HAVE_TIMECOUNTER 250 uint32_t 251 amdpm_get_timecount(struct timecounter *tc) 252 { 253 struct amdpm_softc *sc = tc->tc_priv; 254 255 return bus_space_read_4(sc->sc_iot, sc->sc_ioh, AMDPM_TMR); 256 } 257 #endif 258