1 /*-
2 * Copyright (c) 2005 Poul-Henning Kamp
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
30 #include "opt_acpi.h"
31 #include <sys/param.h>
32 #include <sys/bus.h>
33 #include <sys/kernel.h>
34 #include <sys/module.h>
35 #include <sys/rman.h>
36 #include <sys/time.h>
37 #include <sys/timetc.h>
38
39 #include <contrib/dev/acpica/acpi.h>
40 #include <dev/acpica/acpivar.h>
41 #include <dev/acpica/acpi_hpet.h>
42
43 ACPI_SERIAL_DECL(hpet, "ACPI HPET support");
44
45 static devclass_t acpi_hpet_devclass;
46
47 /* ACPI CA debugging */
48 #define _COMPONENT ACPI_TIMER
49 ACPI_MODULE_NAME("HPET")
50
51 struct acpi_hpet_softc {
52 device_t dev;
53 struct resource *mem_res;
54 ACPI_HANDLE handle;
55 };
56
57 static u_int hpet_get_timecount(struct timecounter *tc);
58 static void acpi_hpet_test(struct acpi_hpet_softc *sc);
59
60 static char *hpet_ids[] = { "PNP0103", NULL };
61
62 #define DEV_HPET(x) (acpi_get_magic(x) == (uintptr_t)&acpi_hpet_devclass)
63
64 struct timecounter hpet_timecounter = {
65 .tc_get_timecount = hpet_get_timecount,
66 .tc_counter_mask = ~0u,
67 .tc_name = "HPET",
68 .tc_quality = 900,
69 };
70
71 static u_int
72 hpet_get_timecount(struct timecounter *tc)
73 {
74 struct acpi_hpet_softc *sc;
75
76 sc = tc->tc_priv;
77 return (bus_read_4(sc->mem_res, HPET_MAIN_COUNTER));
78 }
79
80 static void
81 hpet_enable(struct acpi_hpet_softc *sc)
82 {
83 uint32_t val;
84
85 val = bus_read_4(sc->mem_res, HPET_CONFIG);
86 bus_write_4(sc->mem_res, HPET_CONFIG, val | HPET_CNF_ENABLE);
87 }
88
89 static void
90 hpet_disable(struct acpi_hpet_softc *sc)
91 {
92 uint32_t val;
93
94 val = bus_read_4(sc->mem_res, HPET_CONFIG);
95 bus_write_4(sc->mem_res, HPET_CONFIG, val & ~HPET_CNF_ENABLE);
96 }
97
98 /* Discover the HPET via the ACPI table of the same name. */
99 static void
100 acpi_hpet_identify(driver_t *driver, device_t parent)
101 {
102 ACPI_TABLE_HPET *hpet;
103 ACPI_TABLE_HEADER *hdr;
104 ACPI_STATUS status;
105 device_t child;
106
107 /* Only one HPET device can be added. */
108 if (devclass_get_device(acpi_hpet_devclass, 0))
109 return;
110
111 /* Currently, ID and minimum clock tick info is unused. */
112
113 status = AcpiGetTable(ACPI_SIG_HPET, 1, (ACPI_TABLE_HEADER **)&hdr);
114 if (ACPI_FAILURE(status))
115 return;
116
117 /*
118 * The unit number could be derived from hdr->Sequence but we only
119 * support one HPET device.
120 */
121 hpet = (ACPI_TABLE_HPET *)hdr;
122 if (hpet->Sequence != 0)
123 printf("ACPI HPET table warning: Sequence is non-zero (%d)\n",
124 hpet->Sequence);
125 child = BUS_ADD_CHILD(parent, ACPI_DEV_BASE_ORDER, "acpi_hpet", 0);
126 if (child == NULL) {
127 printf("%s: can't add child\n", __func__);
128 return;
129 }
130
131 /* Record a magic value so we can detect this device later. */
132 acpi_set_magic(child, (uintptr_t)&acpi_hpet_devclass);
133 bus_set_resource(child, SYS_RES_MEMORY, 0, hpet->Address.Address,
134 HPET_MEM_WIDTH);
135 }
136
137 static int
138 acpi_hpet_probe(device_t dev)
139 {
140 ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__);
141
142 if (acpi_disabled("hpet"))
143 return (ENXIO);
144 if (!DEV_HPET(dev) &&
145 (ACPI_ID_PROBE(device_get_parent(dev), dev, hpet_ids) == NULL ||
146 device_get_unit(dev) != 0))
147 return (ENXIO);
148
149 device_set_desc(dev, "High Precision Event Timer");
150 return (0);
151 }
152
153 static int
154 acpi_hpet_attach(device_t dev)
155 {
156 struct acpi_hpet_softc *sc;
157 int rid;
158 uint32_t val, val2;
159 uintmax_t freq;
160
161 ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__);
162
163 sc = device_get_softc(dev);
164 sc->dev = dev;
165 sc->handle = acpi_get_handle(dev);
166
167 rid = 0;
168 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
169 RF_ACTIVE);
170 if (sc->mem_res == NULL)
171 return (ENOMEM);
172
173 /* Validate that we can access the whole region. */
174 if (rman_get_size(sc->mem_res) < HPET_MEM_WIDTH) {
175 device_printf(dev, "memory region width %ld too small\n",
176 rman_get_size(sc->mem_res));
177 bus_free_resource(dev, SYS_RES_MEMORY, sc->mem_res);
178 return (ENXIO);
179 }
180
181 /* Be sure timer is enabled. */
182 hpet_enable(sc);
183
184 /* Read basic statistics about the timer. */
185 val = bus_read_4(sc->mem_res, HPET_PERIOD);
186 if (val == 0) {
187 device_printf(dev, "invalid period\n");
188 hpet_disable(sc);
189 bus_free_resource(dev, SYS_RES_MEMORY, sc->mem_res);
190 return (ENXIO);
191 }
192
193 freq = (1000000000000000LL + val / 2) / val;
194 if (bootverbose) {
195 val = bus_read_4(sc->mem_res, HPET_CAPABILITIES);
196 device_printf(dev,
197 "vend: 0x%x rev: 0x%x num: %d hz: %jd opts:%s%s\n",
198 val >> 16, val & HPET_CAP_REV_ID,
199 (val & HPET_CAP_NUM_TIM) >> 8, freq,
200 (val & HPET_CAP_LEG_RT) ? " legacy_route" : "",
201 (val & HPET_CAP_COUNT_SIZE) ? " 64-bit" : "");
202 }
203
204 if (testenv("debug.acpi.hpet_test"))
205 acpi_hpet_test(sc);
206
207 /*
208 * Don't attach if the timer never increments. Since the spec
209 * requires it to be at least 10 MHz, it has to change in 1 us.
210 */
211 val = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER);
212 DELAY(1);
213 val2 = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER);
214 if (val == val2) {
215 device_printf(dev, "HPET never increments, disabling\n");
216 hpet_disable(sc);
217 bus_free_resource(dev, SYS_RES_MEMORY, sc->mem_res);
218 return (ENXIO);
219 }
220
221 hpet_timecounter.tc_frequency = freq;
222 hpet_timecounter.tc_priv = sc;
223 tc_init(&hpet_timecounter);
224
225 return (0);
226 }
227
228 static int
229 acpi_hpet_detach(device_t dev)
230 {
231 ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__);
232
233 /* XXX Without a tc_remove() function, we can't detach. */
234 return (EBUSY);
235 }
236
237 static int
238 acpi_hpet_suspend(device_t dev)
239 {
240 struct acpi_hpet_softc *sc;
241
242 /*
243 * Disable the timer during suspend. The timer will not lose
244 * its state in S1 or S2, but we are required to disable
245 * it.
246 */
247 sc = device_get_softc(dev);
248 hpet_disable(sc);
249
250 return (0);
251 }
252
253 static int
254 acpi_hpet_resume(device_t dev)
255 {
256 struct acpi_hpet_softc *sc;
257
258 /* Re-enable the timer after a resume to keep the clock advancing. */
259 sc = device_get_softc(dev);
260 hpet_enable(sc);
261
262 return (0);
263 }
264
265 /* Print some basic latency/rate information to assist in debugging. */
266 static void
267 acpi_hpet_test(struct acpi_hpet_softc *sc)
268 {
269 int i;
270 uint32_t u1, u2;
271 struct bintime b0, b1, b2;
272 struct timespec ts;
273
274 binuptime(&b0);
275 binuptime(&b0);
276 binuptime(&b1);
277 u1 = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER);
278 for (i = 1; i < 1000; i++)
279 u2 = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER);
280 binuptime(&b2);
281 u2 = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER);
282
283 bintime_sub(&b2, &b1);
284 bintime_sub(&b1, &b0);
285 bintime_sub(&b2, &b1);
286 bintime2timespec(&b2, &ts);
287
288 device_printf(sc->dev, "%ld.%09ld: %u ... %u = %u\n",
289 (long)ts.tv_sec, ts.tv_nsec, u1, u2, u2 - u1);
290
291 device_printf(sc->dev, "time per call: %ld ns\n", ts.tv_nsec / 1000);
292 }
293
294 static device_method_t acpi_hpet_methods[] = {
295 /* Device interface */
296 DEVMETHOD(device_identify, acpi_hpet_identify),
297 DEVMETHOD(device_probe, acpi_hpet_probe),
298 DEVMETHOD(device_attach, acpi_hpet_attach),
299 DEVMETHOD(device_detach, acpi_hpet_detach),
300 DEVMETHOD(device_suspend, acpi_hpet_suspend),
301 DEVMETHOD(device_resume, acpi_hpet_resume),
302
303 {0, 0}
304 };
305
306 static driver_t acpi_hpet_driver = {
307 "acpi_hpet",
308 acpi_hpet_methods,
309 sizeof(struct acpi_hpet_softc),
310 };
311
312
313 DRIVER_MODULE(acpi_hpet, acpi, acpi_hpet_driver, acpi_hpet_devclass, 0, 0);
314 MODULE_DEPEND(acpi_hpet, acpi, 1, 1, 1);
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