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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/include/acpi.h>
40 #include <contrib/dev/acpica/include/accommon.h>
41
42 #include <dev/acpica/acpivar.h>
43 #include <dev/acpica/acpi_hpet.h>
44
45 #define HPET_VENDID_AMD         0x4353
46 #define HPET_VENDID_INTEL       0x8086
47
48 ACPI_SERIAL_DECL(hpet, "ACPI HPET support");
49
50 static devclass_t acpi_hpet_devclass;
51
52 /* ACPI CA debugging */
53 #define _COMPONENT      ACPI_TIMER
54 ACPI_MODULE_NAME("HPET")
55
56 struct acpi_hpet_softc {
57         device_t                dev;
58         struct resource         *mem_res;
59         ACPI_HANDLE             handle;
60 };
61
62 static u_int hpet_get_timecount(struct timecounter *tc);
63 static void acpi_hpet_test(struct acpi_hpet_softc *sc);
64
65 static char *hpet_ids[] = { "PNP0103", NULL };
66
67 struct timecounter hpet_timecounter = {
68         .tc_get_timecount =     hpet_get_timecount,
69         .tc_counter_mask =      ~0u,
70         .tc_name =              "HPET",
71         .tc_quality =           900,
72 };
73
74 static u_int
75 hpet_get_timecount(struct timecounter *tc)
76 {
77         struct acpi_hpet_softc *sc;
78
79         sc = tc->tc_priv;
80         return (bus_read_4(sc->mem_res, HPET_MAIN_COUNTER));
81 }
82
83 static void
84 hpet_enable(struct acpi_hpet_softc *sc)
85 {
86         uint32_t val;
87
88         val = bus_read_4(sc->mem_res, HPET_CONFIG);
89         val &= ~HPET_CNF_LEG_RT;
90         val |= HPET_CNF_ENABLE;
91         bus_write_4(sc->mem_res, HPET_CONFIG, val);
92 }
93
94 static void
95 hpet_disable(struct acpi_hpet_softc *sc)
96 {
97         uint32_t val;
98
99         val = bus_read_4(sc->mem_res, HPET_CONFIG);
100         val &= ~HPET_CNF_ENABLE;
101         bus_write_4(sc->mem_res, HPET_CONFIG, val);
102 }
103
104 static ACPI_STATUS
105 acpi_hpet_find(ACPI_HANDLE handle, UINT32 level, void *context,
106     void **status)
107 {
108         char            **ids;
109         uint32_t        id = (uint32_t)(uintptr_t)context;
110         uint32_t        uid = 0;
111
112         for (ids = hpet_ids; *ids != NULL; ids++) {
113                 if (acpi_MatchHid(handle, *ids))
114                         break;
115         }
116         if (*ids == NULL)
117                 return (AE_OK);
118         if (ACPI_FAILURE(acpi_GetInteger(handle, "_UID", &uid)))
119                 uid = 0;
120         if (id == uid)
121                 *((int *)status) = 1;
122         return (AE_OK);
123 }
124
125 /* Discover the HPET via the ACPI table of the same name. */
126 static void 
127 acpi_hpet_identify(driver_t *driver, device_t parent)
128 {
129         ACPI_TABLE_HPET *hpet;
130         ACPI_STATUS     status;
131         device_t        child;
132         int             i, found;
133
134         /* Only one HPET device can be added. */
135         if (devclass_get_device(acpi_hpet_devclass, 0))
136                 return;
137         for (i = 1; ; i++) {
138                 /* Search for HPET table. */
139                 status = AcpiGetTable(ACPI_SIG_HPET, i, (ACPI_TABLE_HEADER **)&hpet);
140                 if (ACPI_FAILURE(status))
141                         return;
142                 /* Search for HPET device with same ID. */
143                 found = 0;
144                 AcpiWalkNamespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
145                     100, acpi_hpet_find, NULL, (void *)(uintptr_t)hpet->Sequence, (void *)&found);
146                 /* If found - let it be probed in normal way. */
147                 if (found)
148                         continue;
149                 /* If not - create it from table info. */
150                 child = BUS_ADD_CHILD(parent, ACPI_DEV_BASE_ORDER, "acpi_hpet", 0);
151                 if (child == NULL) {
152                         printf("%s: can't add child\n", __func__);
153                         continue;
154                 }
155                 bus_set_resource(child, SYS_RES_MEMORY, 0, hpet->Address.Address,
156                     HPET_MEM_WIDTH);
157         }
158 }
159
160 static int
161 acpi_hpet_probe(device_t dev)
162 {
163         ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__);
164
165         if (acpi_disabled("hpet"))
166                 return (ENXIO);
167         if (acpi_get_handle(dev) != NULL &&
168             ACPI_ID_PROBE(device_get_parent(dev), dev, hpet_ids) == NULL)
169                 return (ENXIO);
170
171         device_set_desc(dev, "High Precision Event Timer");
172         return (0);
173 }
174
175 static int
176 acpi_hpet_attach(device_t dev)
177 {
178         struct acpi_hpet_softc *sc;
179         int rid, num_timers;
180         uint32_t val, val2;
181         uintmax_t freq;
182         uint16_t vendor;
183
184         ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__);
185
186         sc = device_get_softc(dev);
187         sc->dev = dev;
188         sc->handle = acpi_get_handle(dev);
189
190         rid = 0;
191         sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
192             RF_ACTIVE);
193         if (sc->mem_res == NULL)
194                 return (ENOMEM);
195
196         /* Validate that we can access the whole region. */
197         if (rman_get_size(sc->mem_res) < HPET_MEM_WIDTH) {
198                 device_printf(dev, "memory region width %ld too small\n",
199                     rman_get_size(sc->mem_res));
200                 bus_free_resource(dev, SYS_RES_MEMORY, sc->mem_res);
201                 return (ENXIO);
202         }
203
204         /* Be sure timer is enabled. */
205         hpet_enable(sc);
206
207         /* Read basic statistics about the timer. */
208         val = bus_read_4(sc->mem_res, HPET_PERIOD);
209         if (val == 0) {
210                 device_printf(dev, "invalid period\n");
211                 hpet_disable(sc);
212                 bus_free_resource(dev, SYS_RES_MEMORY, sc->mem_res);
213                 return (ENXIO);
214         }
215
216         freq = (1000000000000000LL + val / 2) / val;
217         if (bootverbose) {
218                 val = bus_read_4(sc->mem_res, HPET_CAPABILITIES);
219
220                 /*
221                  * ATI/AMD violates IA-PC HPET (High Precision Event Timers)
222                  * Specification and provides an off by one number
223                  * of timers/comparators.
224                  * Additionally, they use unregistered value in VENDOR_ID field.
225                  */
226                 num_timers = 1 + ((val & HPET_CAP_NUM_TIM) >> 8);
227                 vendor = val >> 16;
228                 if (vendor == HPET_VENDID_AMD && num_timers > 0)
229                         num_timers--;
230                 device_printf(dev,
231                     "vend: 0x%x rev: 0x%x num: %d hz: %jd opts:%s%s\n",
232                     vendor, val & HPET_CAP_REV_ID,
233                     num_timers, freq,
234                     (val & HPET_CAP_LEG_RT) ? " legacy_route" : "",
235                     (val & HPET_CAP_COUNT_SIZE) ? " 64-bit" : "");
236         }
237
238         if (testenv("debug.acpi.hpet_test"))
239                 acpi_hpet_test(sc);
240
241         /*
242          * Don't attach if the timer never increments.  Since the spec
243          * requires it to be at least 10 MHz, it has to change in 1 us.
244          */
245         val = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER);
246         DELAY(1);
247         val2 = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER);
248         if (val == val2) {
249                 device_printf(dev, "HPET never increments, disabling\n");
250                 hpet_disable(sc);
251                 bus_free_resource(dev, SYS_RES_MEMORY, sc->mem_res);
252                 return (ENXIO);
253         }
254         /* Announce first HPET as timecounter. */
255         if (device_get_unit(dev) == 0) {
256                 hpet_timecounter.tc_frequency = freq;
257                 hpet_timecounter.tc_priv = sc;
258                 tc_init(&hpet_timecounter);
259         }
260         return (0);
261 }
262
263 static int
264 acpi_hpet_detach(device_t dev)
265 {
266         ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__);
267
268         /* XXX Without a tc_remove() function, we can't detach. */
269         return (EBUSY);
270 }
271
272 static int
273 acpi_hpet_suspend(device_t dev)
274 {
275         struct acpi_hpet_softc *sc;
276
277         /*
278          * Disable the timer during suspend.  The timer will not lose
279          * its state in S1 or S2, but we are required to disable
280          * it.
281          */
282         sc = device_get_softc(dev);
283         hpet_disable(sc);
284
285         return (0);
286 }
287
288 static int
289 acpi_hpet_resume(device_t dev)
290 {
291         struct acpi_hpet_softc *sc;
292
293         /* Re-enable the timer after a resume to keep the clock advancing. */
294         sc = device_get_softc(dev);
295         hpet_enable(sc);
296
297         return (0);
298 }
299
300 /* Print some basic latency/rate information to assist in debugging. */
301 static void
302 acpi_hpet_test(struct acpi_hpet_softc *sc)
303 {
304         int i;
305         uint32_t u1, u2;
306         struct bintime b0, b1, b2;
307         struct timespec ts;
308
309         binuptime(&b0);
310         binuptime(&b0);
311         binuptime(&b1);
312         u1 = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER);
313         for (i = 1; i < 1000; i++)
314                 u2 = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER);
315         binuptime(&b2);
316         u2 = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER);
317
318         bintime_sub(&b2, &b1);
319         bintime_sub(&b1, &b0);
320         bintime_sub(&b2, &b1);
321         bintime2timespec(&b2, &ts);
322
323         device_printf(sc->dev, "%ld.%09ld: %u ... %u = %u\n",
324             (long)ts.tv_sec, ts.tv_nsec, u1, u2, u2 - u1);
325
326         device_printf(sc->dev, "time per call: %ld ns\n", ts.tv_nsec / 1000);
327 }
328
329 static device_method_t acpi_hpet_methods[] = {
330         /* Device interface */
331         DEVMETHOD(device_identify, acpi_hpet_identify),
332         DEVMETHOD(device_probe, acpi_hpet_probe),
333         DEVMETHOD(device_attach, acpi_hpet_attach),
334         DEVMETHOD(device_detach, acpi_hpet_detach),
335         DEVMETHOD(device_suspend, acpi_hpet_suspend),
336         DEVMETHOD(device_resume, acpi_hpet_resume),
337
338         {0, 0}
339 };
340
341 static driver_t acpi_hpet_driver = {
342         "acpi_hpet",
343         acpi_hpet_methods,
344         sizeof(struct acpi_hpet_softc),
345 };
346
347
348 DRIVER_MODULE(acpi_hpet, acpi, acpi_hpet_driver, acpi_hpet_devclass, 0, 0);
349 MODULE_DEPEND(acpi_hpet, acpi, 1, 1, 1);