1 /* $NetBSD: amdpm.c,v 1.43 2022/03/19 11:37:06 riastradh 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 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: amdpm.c,v 1.43 2022/03/19 11:37:06 riastradh Exp $");
34
35 #include "opt_amdpm.h"
36
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/kernel.h>
40 #include <sys/device.h>
41 #include <sys/callout.h>
42 #include <sys/rndsource.h>
43 #include <sys/mutex.h>
44
45 #include <sys/bus.h>
46 #include <dev/ic/acpipmtimer.h>
47
48 #include <dev/i2c/i2cvar.h>
49
50 #include <dev/pci/pcivar.h>
51 #include <dev/pci/pcireg.h>
52 #include <dev/pci/pcidevs.h>
53
54 #include <dev/pci/amdpmreg.h>
55 #include <dev/pci/amdpmvar.h>
56 #include <dev/pci/amdpm_smbusreg.h>
57
58 static void amdpm_rnd_callout(void *);
59 static void amdpm_rnd_callout_locked(void *);
60
61 #ifdef AMDPM_RND_COUNTERS
62 #define AMDPM_RNDCNT_INCR(ev) (ev)->ev_count++
63 #endif
64
65 static int
amdpm_match(device_t parent,cfdata_t match,void * aux)66 amdpm_match(device_t parent, cfdata_t match, void *aux)
67 {
68 struct pci_attach_args *pa = aux;
69
70 if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_AMD) {
71 switch (PCI_PRODUCT(pa->pa_id)) {
72 case PCI_PRODUCT_AMD_PBC768_PMC:
73 case PCI_PRODUCT_AMD_PBC8111_ACPI:
74 return (1);
75 }
76 }
77 if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_NVIDIA) {
78 switch (PCI_PRODUCT(pa->pa_id)) {
79 case PCI_PRODUCT_NVIDIA_XBOX_SMBUS:
80 return (1);
81 }
82 }
83
84 return (0);
85 }
86
87 static void
amdpm_rnd_get(size_t bytes,void * priv)88 amdpm_rnd_get(size_t bytes, void *priv)
89 {
90 struct amdpm_softc *sc = priv;
91
92 mutex_enter(&sc->sc_mutex);
93 sc->sc_rnd_need = bytes;
94 amdpm_rnd_callout_locked(sc);
95 mutex_exit(&sc->sc_mutex);
96 }
97
98 static void
amdpm_attach(device_t parent,device_t self,void * aux)99 amdpm_attach(device_t parent, device_t self, void *aux)
100 {
101 struct amdpm_softc *sc = device_private(self);
102 struct pci_attach_args *pa = aux;
103 pcireg_t confreg, pmptrreg;
104 u_int32_t pmreg;
105 int i;
106
107 pci_aprint_devinfo(pa, NULL);
108
109 sc->sc_dev = self;
110
111 if (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_NVIDIA_XBOX_SMBUS)
112 sc->sc_nforce = 1;
113 else
114 sc->sc_nforce = 0;
115
116 sc->sc_pc = pa->pa_pc;
117 sc->sc_tag = pa->pa_tag;
118 sc->sc_iot = pa->pa_iot;
119 sc->sc_pa = pa;
120
121 confreg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG);
122 /* enable pm i/o space for AMD-8111 and nForce */
123 if (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_PBC8111_ACPI ||
124 sc->sc_nforce)
125 confreg |= AMDPM_PMIOEN;
126
127 /* Enable random number generation for everyone */
128 pci_conf_write(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG,
129 confreg | AMDPM_RNGEN);
130 confreg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG);
131
132 if ((confreg & AMDPM_PMIOEN) == 0) {
133 aprint_error_dev(self, "PMxx space isn't enabled\n");
134 return;
135 }
136
137 if (sc->sc_nforce) {
138 pmptrreg = pci_conf_read(pa->pa_pc, pa->pa_tag, NFORCE_PMPTR);
139 aprint_normal_dev(self, "power management at 0x%04x\n",
140 NFORCE_PMBASE(pmptrreg));
141 if (bus_space_map(sc->sc_iot, NFORCE_PMBASE(pmptrreg),
142 AMDPM_PMSIZE, 0, &sc->sc_ioh)) {
143 aprint_error_dev(self, "failed to map PMxx space\n");
144 return;
145 }
146 } else {
147 pmptrreg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_PMPTR);
148 if (bus_space_map(sc->sc_iot, AMDPM_PMBASE(pmptrreg),
149 AMDPM_PMSIZE, 0, &sc->sc_ioh)) {
150 aprint_error_dev(self, "failed to map PMxx space\n");
151 return;
152 }
153 }
154
155 /* don't attach a timecounter on nforce boards */
156 if ((confreg & AMDPM_TMRRST) == 0 && (confreg & AMDPM_STOPTMR) == 0 &&
157 !sc->sc_nforce) {
158 acpipmtimer_attach(self, sc->sc_iot, sc->sc_ioh,
159 AMDPM_TMR, ((confreg & AMDPM_TMR32) ? ACPIPMT_32BIT : 0));
160 }
161
162 mutex_init(&sc->sc_mutex, MUTEX_DEFAULT, IPL_SOFTSERIAL);
163
164 /* try to attach devices on the smbus */
165 if (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_PBC8111_ACPI ||
166 PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_PBC768_PMC ||
167 sc->sc_nforce) {
168 amdpm_smbus_attach(sc);
169 }
170
171 if (confreg & AMDPM_RNGEN) {
172 /* Check to see if we can read data from the RNG. */
173 (void) bus_space_read_4(sc->sc_iot, sc->sc_ioh,
174 AMDPM_RNGDATA);
175 for (i = 0; i < 1000; i++) {
176 pmreg = bus_space_read_4(sc->sc_iot,
177 sc->sc_ioh, AMDPM_RNGSTAT);
178 if (pmreg & AMDPM_RNGDONE)
179 break;
180 delay(1);
181 }
182 if ((pmreg & AMDPM_RNGDONE) != 0) {
183 aprint_normal_dev(self, ""
184 "random number generator enabled (apprx. %dms)\n",
185 i);
186 callout_init(&sc->sc_rnd_ch, CALLOUT_MPSAFE);
187 #ifdef AMDPM_RND_COUNTERS
188 evcnt_attach_dynamic(&sc->sc_rnd_hits, EVCNT_TYPE_MISC,
189 NULL, device_xname(self), "rnd hits");
190 evcnt_attach_dynamic(&sc->sc_rnd_miss, EVCNT_TYPE_MISC,
191 NULL, device_xname(self), "rnd miss");
192 for (i = 0; i < 256; i++) {
193 evcnt_attach_dynamic(&sc->sc_rnd_data[i],
194 EVCNT_TYPE_MISC, NULL, device_xname(self),
195 "rnd data");
196 }
197 #endif
198 rndsource_setcb(&sc->sc_rnd_source,
199 amdpm_rnd_get, sc);
200 rnd_attach_source(&sc->sc_rnd_source,
201 device_xname(self), RND_TYPE_RNG,
202 RND_FLAG_COLLECT_VALUE|RND_FLAG_HASCB);
203 }
204 }
205 }
206
207 CFATTACH_DECL_NEW(amdpm, sizeof(struct amdpm_softc),
208 amdpm_match, amdpm_attach, NULL, NULL);
209
210 static void
amdpm_rnd_callout_locked(void * v)211 amdpm_rnd_callout_locked(void *v)
212 {
213 struct amdpm_softc *sc = v;
214 u_int32_t rngreg;
215 #ifdef AMDPM_RND_COUNTERS
216 int i;
217 #endif
218
219 if (sc->sc_rnd_need < 1) {
220 callout_stop(&sc->sc_rnd_ch);
221 return;
222 }
223
224 if ((bus_space_read_4(sc->sc_iot, sc->sc_ioh, AMDPM_RNGSTAT) &
225 AMDPM_RNGDONE) != 0) {
226 rngreg = bus_space_read_4(sc->sc_iot, sc->sc_ioh,
227 AMDPM_RNGDATA);
228 rnd_add_data(&sc->sc_rnd_source, &rngreg,
229 sizeof(rngreg), sizeof(rngreg) * NBBY);
230 sc->sc_rnd_need -= sizeof(rngreg);
231 #ifdef AMDPM_RND_COUNTERS
232 AMDPM_RNDCNT_INCR(&sc->sc_rnd_hits);
233 for (i = 0; i < sizeof(rngreg); i++, rngreg >>= NBBY)
234 AMDPM_RNDCNT_INCR(&sc->sc_rnd_data[rngreg & 0xff]);
235 #endif
236 }
237 #ifdef AMDPM_RND_COUNTERS
238 else
239 AMDPM_RNDCNT_INCR(&sc->sc_rnd_miss);
240 #endif
241 if (sc->sc_rnd_need > 0) {
242 callout_reset(&sc->sc_rnd_ch, 1, amdpm_rnd_callout, sc);
243 }
244 }
245
246 static void
amdpm_rnd_callout(void * v)247 amdpm_rnd_callout(void *v)
248 {
249 struct amdpm_softc *sc = v;
250
251 mutex_enter(&sc->sc_mutex);
252 amdpm_rnd_callout_locked(v);
253 mutex_exit(&sc->sc_mutex);
254 }
255