1 /*-
2 * Copyright (c) 2003-2007 Nate Lawson
3 * Copyright (c) 2000 Michael Smith
4 * Copyright (c) 2000 BSDi
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31
32 #include "opt_acpi.h"
33 #include <sys/param.h>
34 #include <sys/kernel.h>
35 #include <sys/ktr.h>
36 #include <sys/bus.h>
37 #include <sys/lock.h>
38 #include <sys/malloc.h>
39 #include <sys/module.h>
40 #include <sys/sx.h>
41
42 #include <machine/bus.h>
43 #include <machine/resource.h>
44 #include <sys/rman.h>
45
46 #include <contrib/dev/acpica/include/acpi.h>
47 #include <contrib/dev/acpica/include/accommon.h>
48
49 #include <dev/acpica/acpivar.h>
50
51 /* Hooks for the ACPI CA debugging infrastructure */
52 #define _COMPONENT ACPI_EC
53 ACPI_MODULE_NAME("EC")
54
55 /*
56 * EC_COMMAND:
57 * -----------
58 */
59 typedef UINT8 EC_COMMAND;
60
61 #define EC_COMMAND_UNKNOWN ((EC_COMMAND) 0x00)
62 #define EC_COMMAND_READ ((EC_COMMAND) 0x80)
63 #define EC_COMMAND_WRITE ((EC_COMMAND) 0x81)
64 #define EC_COMMAND_BURST_ENABLE ((EC_COMMAND) 0x82)
65 #define EC_COMMAND_BURST_DISABLE ((EC_COMMAND) 0x83)
66 #define EC_COMMAND_QUERY ((EC_COMMAND) 0x84)
67
68 /*
69 * EC_STATUS:
70 * ----------
71 * The encoding of the EC status register is illustrated below.
72 * Note that a set bit (1) indicates the property is TRUE
73 * (e.g. if bit 0 is set then the output buffer is full).
74 * +-+-+-+-+-+-+-+-+
75 * |7|6|5|4|3|2|1|0|
76 * +-+-+-+-+-+-+-+-+
77 * | | | | | | | |
78 * | | | | | | | +- Output Buffer Full?
79 * | | | | | | +--- Input Buffer Full?
80 * | | | | | +----- <reserved>
81 * | | | | +------- Data Register is Command Byte?
82 * | | | +--------- Burst Mode Enabled?
83 * | | +----------- SCI Event?
84 * | +------------- SMI Event?
85 * +--------------- <reserved>
86 *
87 */
88 typedef UINT8 EC_STATUS;
89
90 #define EC_FLAG_OUTPUT_BUFFER ((EC_STATUS) 0x01)
91 #define EC_FLAG_INPUT_BUFFER ((EC_STATUS) 0x02)
92 #define EC_FLAG_DATA_IS_CMD ((EC_STATUS) 0x08)
93 #define EC_FLAG_BURST_MODE ((EC_STATUS) 0x10)
94
95 /*
96 * EC_EVENT:
97 * ---------
98 */
99 typedef UINT8 EC_EVENT;
100
101 #define EC_EVENT_UNKNOWN ((EC_EVENT) 0x00)
102 #define EC_EVENT_OUTPUT_BUFFER_FULL ((EC_EVENT) 0x01)
103 #define EC_EVENT_INPUT_BUFFER_EMPTY ((EC_EVENT) 0x02)
104 #define EC_EVENT_SCI ((EC_EVENT) 0x20)
105 #define EC_EVENT_SMI ((EC_EVENT) 0x40)
106
107 /* Data byte returned after burst enable indicating it was successful. */
108 #define EC_BURST_ACK 0x90
109
110 /*
111 * Register access primitives
112 */
113 #define EC_GET_DATA(sc) \
114 bus_space_read_1((sc)->ec_data_tag, (sc)->ec_data_handle, 0)
115
116 #define EC_SET_DATA(sc, v) \
117 bus_space_write_1((sc)->ec_data_tag, (sc)->ec_data_handle, 0, (v))
118
119 #define EC_GET_CSR(sc) \
120 bus_space_read_1((sc)->ec_csr_tag, (sc)->ec_csr_handle, 0)
121
122 #define EC_SET_CSR(sc, v) \
123 bus_space_write_1((sc)->ec_csr_tag, (sc)->ec_csr_handle, 0, (v))
124
125 /* Additional params to pass from the probe routine */
126 struct acpi_ec_params {
127 int glk;
128 int gpe_bit;
129 ACPI_HANDLE gpe_handle;
130 int uid;
131 };
132
133 /*
134 * Driver softc.
135 */
136 struct acpi_ec_softc {
137 device_t ec_dev;
138 ACPI_HANDLE ec_handle;
139 int ec_uid;
140 ACPI_HANDLE ec_gpehandle;
141 UINT8 ec_gpebit;
142
143 int ec_data_rid;
144 struct resource *ec_data_res;
145 bus_space_tag_t ec_data_tag;
146 bus_space_handle_t ec_data_handle;
147
148 int ec_csr_rid;
149 struct resource *ec_csr_res;
150 bus_space_tag_t ec_csr_tag;
151 bus_space_handle_t ec_csr_handle;
152
153 int ec_glk;
154 int ec_glkhandle;
155 int ec_burstactive;
156 int ec_sci_pend;
157 volatile u_int ec_gencount;
158 int ec_suspending;
159 };
160
161 /*
162 * XXX njl
163 * I couldn't find it in the spec but other implementations also use a
164 * value of 1 ms for the time to acquire global lock.
165 */
166 #define EC_LOCK_TIMEOUT 1000
167
168 /* Default delay in microseconds between each run of the status polling loop. */
169 #define EC_POLL_DELAY 50
170
171 /* Total time in ms spent waiting for a response from EC. */
172 #define EC_TIMEOUT 750
173
174 #define EVENT_READY(event, status) \
175 (((event) == EC_EVENT_OUTPUT_BUFFER_FULL && \
176 ((status) & EC_FLAG_OUTPUT_BUFFER) != 0) || \
177 ((event) == EC_EVENT_INPUT_BUFFER_EMPTY && \
178 ((status) & EC_FLAG_INPUT_BUFFER) == 0))
179
180 ACPI_SERIAL_DECL(ec, "ACPI embedded controller");
181
182 static SYSCTL_NODE(_debug_acpi, OID_AUTO, ec,
183 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL,
184 "EC debugging");
185
186 static int ec_burst_mode;
187 SYSCTL_INT(_debug_acpi_ec, OID_AUTO, burst, CTLFLAG_RWTUN, &ec_burst_mode, 0,
188 "Enable use of burst mode (faster for nearly all systems)");
189 static int ec_polled_mode;
190 SYSCTL_INT(_debug_acpi_ec, OID_AUTO, polled, CTLFLAG_RWTUN, &ec_polled_mode, 0,
191 "Force use of polled mode (only if interrupt mode doesn't work)");
192 static int ec_timeout = EC_TIMEOUT;
193 SYSCTL_INT(_debug_acpi_ec, OID_AUTO, timeout, CTLFLAG_RWTUN, &ec_timeout,
194 EC_TIMEOUT, "Total time spent waiting for a response (poll+sleep)");
195
196 static ACPI_STATUS
197 EcLock(struct acpi_ec_softc *sc)
198 {
199 ACPI_STATUS status;
200
201 /* If _GLK is non-zero, acquire the global lock. */
202 status = AE_OK;
203 if (sc->ec_glk) {
204 status = AcpiAcquireGlobalLock(EC_LOCK_TIMEOUT, &sc->ec_glkhandle);
205 if (ACPI_FAILURE(status))
206 return (status);
207 }
208 ACPI_SERIAL_BEGIN(ec);
209 return (status);
210 }
211
212 static void
213 EcUnlock(struct acpi_ec_softc *sc)
214 {
215 ACPI_SERIAL_END(ec);
216 if (sc->ec_glk)
217 AcpiReleaseGlobalLock(sc->ec_glkhandle);
218 }
219
220 static UINT32 EcGpeHandler(ACPI_HANDLE, UINT32, void *);
221 static ACPI_STATUS EcSpaceSetup(ACPI_HANDLE Region, UINT32 Function,
222 void *Context, void **return_Context);
223 static ACPI_STATUS EcSpaceHandler(UINT32 Function,
224 ACPI_PHYSICAL_ADDRESS Address,
225 UINT32 Width, UINT64 *Value,
226 void *Context, void *RegionContext);
227 static ACPI_STATUS EcWaitEvent(struct acpi_ec_softc *sc, EC_EVENT Event,
228 u_int gen_count);
229 static ACPI_STATUS EcCommand(struct acpi_ec_softc *sc, EC_COMMAND cmd);
230 static ACPI_STATUS EcRead(struct acpi_ec_softc *sc, UINT8 Address,
231 UINT8 *Data);
232 static ACPI_STATUS EcWrite(struct acpi_ec_softc *sc, UINT8 Address,
233 UINT8 Data);
234 static int acpi_ec_probe(device_t dev);
235 static int acpi_ec_attach(device_t dev);
236 static int acpi_ec_suspend(device_t dev);
237 static int acpi_ec_resume(device_t dev);
238 static int acpi_ec_shutdown(device_t dev);
239 static int acpi_ec_read_method(device_t dev, u_int addr,
240 UINT64 *val, int width);
241 static int acpi_ec_write_method(device_t dev, u_int addr,
242 UINT64 val, int width);
243
244 static device_method_t acpi_ec_methods[] = {
245 /* Device interface */
246 DEVMETHOD(device_probe, acpi_ec_probe),
247 DEVMETHOD(device_attach, acpi_ec_attach),
248 DEVMETHOD(device_suspend, acpi_ec_suspend),
249 DEVMETHOD(device_resume, acpi_ec_resume),
250 DEVMETHOD(device_shutdown, acpi_ec_shutdown),
251
252 /* Embedded controller interface */
253 DEVMETHOD(acpi_ec_read, acpi_ec_read_method),
254 DEVMETHOD(acpi_ec_write, acpi_ec_write_method),
255
256 DEVMETHOD_END
257 };
258
259 static driver_t acpi_ec_driver = {
260 "acpi_ec",
261 acpi_ec_methods,
262 sizeof(struct acpi_ec_softc),
263 };
264
265 DRIVER_MODULE(acpi_ec, acpi, acpi_ec_driver, 0, 0);
266 MODULE_DEPEND(acpi_ec, acpi, 1, 1, 1);
267
268 /*
269 * Look for an ECDT and if we find one, set up default GPE and
270 * space handlers to catch attempts to access EC space before
271 * we have a real driver instance in place.
272 *
273 * TODO: Some old Gateway laptops need us to fake up an ECDT or
274 * otherwise attach early so that _REG methods can run.
275 */
276 void
277 acpi_ec_ecdt_probe(device_t parent)
278 {
279 ACPI_TABLE_ECDT *ecdt;
280 ACPI_STATUS status;
281 device_t child;
282 ACPI_HANDLE h;
283 struct acpi_ec_params *params;
284
285 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
286
287 /* Find and validate the ECDT. */
288 status = AcpiGetTable(ACPI_SIG_ECDT, 1, (ACPI_TABLE_HEADER **)&ecdt);
289 if (ACPI_FAILURE(status) ||
290 ecdt->Control.BitWidth != 8 ||
291 ecdt->Data.BitWidth != 8) {
292 return;
293 }
294
295 /* Create the child device with the given unit number. */
296 child = BUS_ADD_CHILD(parent, 3, "acpi_ec", ecdt->Uid);
297 if (child == NULL) {
298 printf("%s: can't add child\n", __func__);
299 return;
300 }
301
302 /* Find and save the ACPI handle for this device. */
303 status = AcpiGetHandle(NULL, ecdt->Id, &h);
304 if (ACPI_FAILURE(status)) {
305 device_delete_child(parent, child);
306 printf("%s: can't get handle\n", __func__);
307 return;
308 }
309 acpi_set_handle(child, h);
310
311 /* Set the data and CSR register addresses. */
312 bus_set_resource(child, SYS_RES_IOPORT, 0, ecdt->Data.Address,
313 /*count*/1);
314 bus_set_resource(child, SYS_RES_IOPORT, 1, ecdt->Control.Address,
315 /*count*/1);
316
317 /*
318 * Store values for the probe/attach routines to use. Store the
319 * ECDT GPE bit and set the global lock flag according to _GLK.
320 * Note that it is not perfectly correct to be evaluating a method
321 * before initializing devices, but in practice this function
322 * should be safe to call at this point.
323 */
324 params = malloc(sizeof(struct acpi_ec_params), M_TEMP, M_WAITOK | M_ZERO);
325 params->gpe_handle = NULL;
326 params->gpe_bit = ecdt->Gpe;
327 params->uid = ecdt->Uid;
328 acpi_GetInteger(h, "_GLK", ¶ms->glk);
329 acpi_set_private(child, params);
330
331 /* Finish the attach process. */
332 if (device_probe_and_attach(child) != 0)
333 device_delete_child(parent, child);
334 }
335
336 static int
337 acpi_ec_probe(device_t dev)
338 {
339 ACPI_BUFFER buf;
340 ACPI_HANDLE h;
341 ACPI_OBJECT *obj;
342 ACPI_STATUS status;
343 device_t peer;
344 char desc[64];
345 int ecdt;
346 int ret, rc;
347 struct acpi_ec_params *params;
348 static char *ec_ids[] = { "PNP0C09", NULL };
349
350 ret = ENXIO;
351
352 /* Check that this is a device and that EC is not disabled. */
353 if (acpi_get_type(dev) != ACPI_TYPE_DEVICE || acpi_disabled("ec"))
354 return (ret);
355
356 if (device_is_devclass_fixed(dev)) {
357 /*
358 * If probed via ECDT, set description and continue. Otherwise, we can
359 * access the namespace and make sure this is not a duplicate probe.
360 */
361 ecdt = 1;
362 params = acpi_get_private(dev);
363 if (params != NULL)
364 ret = 0;
365
366 goto out;
367 } else
368 ecdt = 0;
369
370 rc = ACPI_ID_PROBE(device_get_parent(dev), dev, ec_ids, NULL);
371 if (rc > 0)
372 return (rc);
373
374 params = malloc(sizeof(struct acpi_ec_params), M_TEMP, M_WAITOK | M_ZERO);
375
376 buf.Pointer = NULL;
377 buf.Length = ACPI_ALLOCATE_BUFFER;
378 h = acpi_get_handle(dev);
379
380 /*
381 * Read the unit ID to check for duplicate attach and the global lock value
382 * to see if we should acquire it when accessing the EC.
383 */
384 status = acpi_GetInteger(h, "_UID", ¶ms->uid);
385 if (ACPI_FAILURE(status))
386 params->uid = 0;
387
388 /*
389 * Check for a duplicate probe. This can happen when a probe via ECDT
390 * succeeded already. If this is a duplicate, disable this device.
391 *
392 * NB: It would seem device_disable would be sufficient to not get
393 * duplicated devices, and ENXIO isn't needed, however, device_probe() only
394 * checks DF_ENABLED at the start and so disabling it here is too late to
395 * prevent device_attach() from being called.
396 */
397 peer = devclass_get_device(device_get_devclass(dev), params->uid);
398 if (peer != NULL && device_is_alive(peer)) {
399 device_disable(dev);
400 goto out;
401 }
402
403 status = acpi_GetInteger(h, "_GLK", ¶ms->glk);
404 if (ACPI_FAILURE(status))
405 params->glk = 0;
406
407 /*
408 * Evaluate the _GPE method to find the GPE bit used by the EC to signal
409 * status (SCI). If it's a package, it contains a reference and GPE bit,
410 * similar to _PRW.
411 */
412 status = AcpiEvaluateObject(h, "_GPE", NULL, &buf);
413 if (ACPI_FAILURE(status)) {
414 device_printf(dev, "can't evaluate _GPE - %s\n", AcpiFormatException(status));
415 goto out;
416 }
417
418 obj = (ACPI_OBJECT *)buf.Pointer;
419 if (obj == NULL)
420 goto out;
421
422 switch (obj->Type) {
423 case ACPI_TYPE_INTEGER:
424 params->gpe_handle = NULL;
425 params->gpe_bit = obj->Integer.Value;
426 break;
427 case ACPI_TYPE_PACKAGE:
428 if (!ACPI_PKG_VALID(obj, 2))
429 goto out;
430 params->gpe_handle = acpi_GetReference(NULL, &obj->Package.Elements[0]);
431 if (params->gpe_handle == NULL ||
432 acpi_PkgInt32(obj, 1, ¶ms->gpe_bit) != 0)
433 goto out;
434 break;
435 default:
436 device_printf(dev, "_GPE has invalid type %d\n", obj->Type);
437 goto out;
438 }
439
440 /* Store the values we got from the namespace for attach. */
441 acpi_set_private(dev, params);
442
443 if (buf.Pointer)
444 AcpiOsFree(buf.Pointer);
445
446 ret = rc;
447 out:
448 if (ret <= 0) {
449 snprintf(desc, sizeof(desc), "Embedded Controller: GPE %#x%s%s",
450 params->gpe_bit, (params->glk) ? ", GLK" : "",
451 ecdt ? ", ECDT" : "");
452 device_set_desc_copy(dev, desc);
453 } else
454 free(params, M_TEMP);
455
456 return (ret);
457 }
458
459 static int
460 acpi_ec_attach(device_t dev)
461 {
462 struct acpi_ec_softc *sc;
463 struct acpi_ec_params *params;
464 ACPI_STATUS Status;
465
466 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
467
468 /* Fetch/initialize softc (assumes softc is pre-zeroed). */
469 sc = device_get_softc(dev);
470 params = acpi_get_private(dev);
471 sc->ec_dev = dev;
472 sc->ec_handle = acpi_get_handle(dev);
473
474 /* Retrieve previously probed values via device ivars. */
475 sc->ec_glk = params->glk;
476 sc->ec_gpebit = params->gpe_bit;
477 sc->ec_gpehandle = params->gpe_handle;
478 sc->ec_uid = params->uid;
479 sc->ec_suspending = FALSE;
480 acpi_set_private(dev, NULL);
481 free(params, M_TEMP);
482
483 /* Attach bus resources for data and command/status ports. */
484 sc->ec_data_rid = 0;
485 sc->ec_data_res = bus_alloc_resource_any(sc->ec_dev, SYS_RES_IOPORT,
486 &sc->ec_data_rid, RF_ACTIVE);
487 if (sc->ec_data_res == NULL) {
488 device_printf(dev, "can't allocate data port\n");
489 goto error;
490 }
491 sc->ec_data_tag = rman_get_bustag(sc->ec_data_res);
492 sc->ec_data_handle = rman_get_bushandle(sc->ec_data_res);
493
494 sc->ec_csr_rid = 1;
495 sc->ec_csr_res = bus_alloc_resource_any(sc->ec_dev, SYS_RES_IOPORT,
496 &sc->ec_csr_rid, RF_ACTIVE);
497 if (sc->ec_csr_res == NULL) {
498 device_printf(dev, "can't allocate command/status port\n");
499 goto error;
500 }
501 sc->ec_csr_tag = rman_get_bustag(sc->ec_csr_res);
502 sc->ec_csr_handle = rman_get_bushandle(sc->ec_csr_res);
503
504 /*
505 * Install a handler for this EC's GPE bit. We want edge-triggered
506 * behavior.
507 */
508 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "attaching GPE handler\n"));
509 Status = AcpiInstallGpeHandler(sc->ec_gpehandle, sc->ec_gpebit,
510 ACPI_GPE_EDGE_TRIGGERED, EcGpeHandler, sc);
511 if (ACPI_FAILURE(Status)) {
512 device_printf(dev, "can't install GPE handler for %s - %s\n",
513 acpi_name(sc->ec_handle), AcpiFormatException(Status));
514 goto error;
515 }
516
517 /*
518 * Install address space handler
519 */
520 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "attaching address space handler\n"));
521 Status = AcpiInstallAddressSpaceHandler(sc->ec_handle, ACPI_ADR_SPACE_EC,
522 &EcSpaceHandler, &EcSpaceSetup, sc);
523 if (ACPI_FAILURE(Status)) {
524 device_printf(dev, "can't install address space handler for %s - %s\n",
525 acpi_name(sc->ec_handle), AcpiFormatException(Status));
526 goto error;
527 }
528
529 /* Enable runtime GPEs for the handler. */
530 Status = AcpiEnableGpe(sc->ec_gpehandle, sc->ec_gpebit);
531 if (ACPI_FAILURE(Status)) {
532 device_printf(dev, "AcpiEnableGpe failed: %s\n",
533 AcpiFormatException(Status));
534 goto error;
535 }
536
537 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "acpi_ec_attach complete\n"));
538 return (0);
539
540 error:
541 AcpiRemoveGpeHandler(sc->ec_gpehandle, sc->ec_gpebit, EcGpeHandler);
542 AcpiRemoveAddressSpaceHandler(sc->ec_handle, ACPI_ADR_SPACE_EC,
543 EcSpaceHandler);
544 if (sc->ec_csr_res)
545 bus_release_resource(sc->ec_dev, SYS_RES_IOPORT, sc->ec_csr_rid,
546 sc->ec_csr_res);
547 if (sc->ec_data_res)
548 bus_release_resource(sc->ec_dev, SYS_RES_IOPORT, sc->ec_data_rid,
549 sc->ec_data_res);
550 return (ENXIO);
551 }
552
553 static int
554 acpi_ec_suspend(device_t dev)
555 {
556 struct acpi_ec_softc *sc;
557
558 sc = device_get_softc(dev);
559 sc->ec_suspending = TRUE;
560 return (0);
561 }
562
563 static int
564 acpi_ec_resume(device_t dev)
565 {
566 struct acpi_ec_softc *sc;
567
568 sc = device_get_softc(dev);
569 sc->ec_suspending = FALSE;
570 return (0);
571 }
572
573 static int
574 acpi_ec_shutdown(device_t dev)
575 {
576 struct acpi_ec_softc *sc;
577
578 /* Disable the GPE so we don't get EC events during shutdown. */
579 sc = device_get_softc(dev);
580 AcpiDisableGpe(sc->ec_gpehandle, sc->ec_gpebit);
581 return (0);
582 }
583
584 /* Methods to allow other devices (e.g., smbat) to read/write EC space. */
585 static int
586 acpi_ec_read_method(device_t dev, u_int addr, UINT64 *val, int width)
587 {
588 struct acpi_ec_softc *sc;
589 ACPI_STATUS status;
590
591 sc = device_get_softc(dev);
592 status = EcSpaceHandler(ACPI_READ, addr, width * 8, val, sc, NULL);
593 if (ACPI_FAILURE(status))
594 return (ENXIO);
595 return (0);
596 }
597
598 static int
599 acpi_ec_write_method(device_t dev, u_int addr, UINT64 val, int width)
600 {
601 struct acpi_ec_softc *sc;
602 ACPI_STATUS status;
603
604 sc = device_get_softc(dev);
605 status = EcSpaceHandler(ACPI_WRITE, addr, width * 8, &val, sc, NULL);
606 if (ACPI_FAILURE(status))
607 return (ENXIO);
608 return (0);
609 }
610
611 static ACPI_STATUS
612 EcCheckStatus(struct acpi_ec_softc *sc, const char *msg, EC_EVENT event)
613 {
614 ACPI_STATUS status;
615 EC_STATUS ec_status;
616
617 status = AE_NO_HARDWARE_RESPONSE;
618 ec_status = EC_GET_CSR(sc);
619 if (sc->ec_burstactive && !(ec_status & EC_FLAG_BURST_MODE)) {
620 CTR1(KTR_ACPI, "ec burst disabled in waitevent (%s)", msg);
621 sc->ec_burstactive = FALSE;
622 }
623 if (EVENT_READY(event, ec_status)) {
624 CTR2(KTR_ACPI, "ec %s wait ready, status %#x", msg, ec_status);
625 status = AE_OK;
626 }
627 return (status);
628 }
629
630 static void
631 EcGpeQueryHandlerSub(struct acpi_ec_softc *sc)
632 {
633 UINT8 Data;
634 ACPI_STATUS Status;
635 int retry;
636 char qxx[5];
637
638 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
639
640 /* Serialize user access with EcSpaceHandler(). */
641 Status = EcLock(sc);
642 if (ACPI_FAILURE(Status)) {
643 device_printf(sc->ec_dev, "GpeQuery lock error: %s\n",
644 AcpiFormatException(Status));
645 return;
646 }
647
648 /*
649 * Send a query command to the EC to find out which _Qxx call it
650 * wants to make. This command clears the SCI bit and also the
651 * interrupt source since we are edge-triggered. To prevent the GPE
652 * that may arise from running the query from causing another query
653 * to be queued, we clear the pending flag only after running it.
654 */
655 for (retry = 0; retry < 2; retry++) {
656 Status = EcCommand(sc, EC_COMMAND_QUERY);
657 if (ACPI_SUCCESS(Status))
658 break;
659 if (ACPI_FAILURE(EcCheckStatus(sc, "retr_check",
660 EC_EVENT_INPUT_BUFFER_EMPTY)))
661 break;
662 }
663 if (ACPI_FAILURE(Status)) {
664 EcUnlock(sc);
665 device_printf(sc->ec_dev, "GPE query failed: %s\n",
666 AcpiFormatException(Status));
667 return;
668 }
669 Data = EC_GET_DATA(sc);
670
671 /*
672 * We have to unlock before running the _Qxx method below since that
673 * method may attempt to read/write from EC address space, causing
674 * recursive acquisition of the lock.
675 */
676 EcUnlock(sc);
677
678 /* Ignore the value for "no outstanding event". (13.3.5) */
679 CTR2(KTR_ACPI, "ec query ok,%s running _Q%02X", Data ? "" : " not", Data);
680 if (Data == 0)
681 return;
682
683 /* Evaluate _Qxx to respond to the controller. */
684 snprintf(qxx, sizeof(qxx), "_Q%02X", Data);
685 AcpiUtStrupr(qxx);
686 Status = AcpiEvaluateObject(sc->ec_handle, qxx, NULL, NULL);
687 if (ACPI_FAILURE(Status) && Status != AE_NOT_FOUND) {
688 device_printf(sc->ec_dev, "evaluation of query method %s failed: %s\n",
689 qxx, AcpiFormatException(Status));
690 }
691 }
692
693 static void
694 EcGpeQueryHandler(void *Context)
695 {
696 struct acpi_ec_softc *sc = (struct acpi_ec_softc *)Context;
697 int pending;
698
699 KASSERT(Context != NULL, ("EcGpeQueryHandler called with NULL"));
700
701 do {
702 /* Read the current pending count */
703 pending = atomic_load_acq_int(&sc->ec_sci_pend);
704
705 /* Call GPE handler function */
706 EcGpeQueryHandlerSub(sc);
707
708 /*
709 * Try to reset the pending count to zero. If this fails we
710 * know another GPE event has occurred while handling the
711 * current GPE event and need to loop.
712 */
713 } while (!atomic_cmpset_int(&sc->ec_sci_pend, pending, 0));
714 }
715
716 /*
717 * The GPE handler is called when IBE/OBF or SCI events occur. We are
718 * called from an unknown lock context.
719 */
720 static UINT32
721 EcGpeHandler(ACPI_HANDLE GpeDevice, UINT32 GpeNumber, void *Context)
722 {
723 struct acpi_ec_softc *sc = Context;
724 ACPI_STATUS Status;
725 EC_STATUS EcStatus;
726
727 KASSERT(Context != NULL, ("EcGpeHandler called with NULL"));
728 CTR0(KTR_ACPI, "ec gpe handler start");
729
730 /*
731 * Notify EcWaitEvent() that the status register is now fresh. If we
732 * didn't do this, it wouldn't be possible to distinguish an old IBE
733 * from a new one, for example when doing a write transaction (writing
734 * address and then data values.)
735 */
736 atomic_add_int(&sc->ec_gencount, 1);
737 wakeup(sc);
738
739 /*
740 * If the EC_SCI bit of the status register is set, queue a query handler.
741 * It will run the query and _Qxx method later, under the lock.
742 */
743 EcStatus = EC_GET_CSR(sc);
744 if ((EcStatus & EC_EVENT_SCI) &&
745 atomic_fetchadd_int(&sc->ec_sci_pend, 1) == 0) {
746 CTR0(KTR_ACPI, "ec gpe queueing query handler");
747 Status = AcpiOsExecute(OSL_GPE_HANDLER, EcGpeQueryHandler, Context);
748 if (ACPI_FAILURE(Status)) {
749 printf("EcGpeHandler: queuing GPE query handler failed\n");
750 atomic_store_rel_int(&sc->ec_sci_pend, 0);
751 }
752 }
753 return (ACPI_REENABLE_GPE);
754 }
755
756 static ACPI_STATUS
757 EcSpaceSetup(ACPI_HANDLE Region, UINT32 Function, void *Context,
758 void **RegionContext)
759 {
760
761 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
762
763 /*
764 * If deactivating a region, always set the output to NULL. Otherwise,
765 * just pass the context through.
766 */
767 if (Function == ACPI_REGION_DEACTIVATE)
768 *RegionContext = NULL;
769 else
770 *RegionContext = Context;
771
772 return_ACPI_STATUS (AE_OK);
773 }
774
775 static ACPI_STATUS
776 EcSpaceHandler(UINT32 Function, ACPI_PHYSICAL_ADDRESS Address, UINT32 Width,
777 UINT64 *Value, void *Context, void *RegionContext)
778 {
779 struct acpi_ec_softc *sc = (struct acpi_ec_softc *)Context;
780 ACPI_PHYSICAL_ADDRESS EcAddr;
781 UINT8 *EcData;
782 ACPI_STATUS Status;
783
784 ACPI_FUNCTION_TRACE_U32((char *)(uintptr_t)__func__, (UINT32)Address);
785
786 if (Function != ACPI_READ && Function != ACPI_WRITE)
787 return_ACPI_STATUS (AE_BAD_PARAMETER);
788 if (Width % 8 != 0 || Value == NULL || Context == NULL)
789 return_ACPI_STATUS (AE_BAD_PARAMETER);
790 if (Address + Width / 8 > 256)
791 return_ACPI_STATUS (AE_BAD_ADDRESS);
792
793 /*
794 * If booting, check if we need to run the query handler. If so, we
795 * we call it directly here since our thread taskq is not active yet.
796 */
797 if (cold || rebooting || sc->ec_suspending) {
798 if ((EC_GET_CSR(sc) & EC_EVENT_SCI) &&
799 atomic_fetchadd_int(&sc->ec_sci_pend, 1) == 0) {
800 CTR0(KTR_ACPI, "ec running gpe handler directly");
801 EcGpeQueryHandler(sc);
802 }
803 }
804
805 /* Serialize with EcGpeQueryHandler() at transaction granularity. */
806 Status = EcLock(sc);
807 if (ACPI_FAILURE(Status))
808 return_ACPI_STATUS (Status);
809
810 /* If we can't start burst mode, continue anyway. */
811 Status = EcCommand(sc, EC_COMMAND_BURST_ENABLE);
812 if (ACPI_SUCCESS(Status)) {
813 if (EC_GET_DATA(sc) == EC_BURST_ACK) {
814 CTR0(KTR_ACPI, "ec burst enabled");
815 sc->ec_burstactive = TRUE;
816 }
817 }
818
819 /* Perform the transaction(s), based on Width. */
820 EcAddr = Address;
821 EcData = (UINT8 *)Value;
822 if (Function == ACPI_READ)
823 *Value = 0;
824 do {
825 switch (Function) {
826 case ACPI_READ:
827 Status = EcRead(sc, EcAddr, EcData);
828 break;
829 case ACPI_WRITE:
830 Status = EcWrite(sc, EcAddr, *EcData);
831 break;
832 }
833 if (ACPI_FAILURE(Status))
834 break;
835 EcAddr++;
836 EcData++;
837 } while (EcAddr < Address + Width / 8);
838
839 if (sc->ec_burstactive) {
840 sc->ec_burstactive = FALSE;
841 if (ACPI_SUCCESS(EcCommand(sc, EC_COMMAND_BURST_DISABLE)))
842 CTR0(KTR_ACPI, "ec disabled burst ok");
843 }
844
845 EcUnlock(sc);
846 return_ACPI_STATUS (Status);
847 }
848
849 static ACPI_STATUS
850 EcWaitEvent(struct acpi_ec_softc *sc, EC_EVENT Event, u_int gen_count)
851 {
852 static int no_intr = 0;
853 ACPI_STATUS Status;
854 int count, i, need_poll, slp_ival;
855
856 ACPI_SERIAL_ASSERT(ec);
857 Status = AE_NO_HARDWARE_RESPONSE;
858 need_poll = cold || rebooting || ec_polled_mode || sc->ec_suspending;
859
860 /* Wait for event by polling or GPE (interrupt). */
861 if (need_poll) {
862 count = (ec_timeout * 1000) / EC_POLL_DELAY;
863 if (count == 0)
864 count = 1;
865 DELAY(10);
866 for (i = 0; i < count; i++) {
867 Status = EcCheckStatus(sc, "poll", Event);
868 if (ACPI_SUCCESS(Status))
869 break;
870 DELAY(EC_POLL_DELAY);
871 }
872 } else {
873 slp_ival = hz / 1000;
874 if (slp_ival != 0) {
875 count = ec_timeout;
876 } else {
877 /* hz has less than 1 ms resolution so scale timeout. */
878 slp_ival = 1;
879 count = ec_timeout / (1000 / hz);
880 }
881
882 /*
883 * Wait for the GPE to signal the status changed, checking the
884 * status register each time we get one. It's possible to get a
885 * GPE for an event we're not interested in here (i.e., SCI for
886 * EC query).
887 */
888 for (i = 0; i < count; i++) {
889 if (gen_count == sc->ec_gencount)
890 tsleep(sc, 0, "ecgpe", slp_ival);
891 /*
892 * Record new generation count. It's possible the GPE was
893 * just to notify us that a query is needed and we need to
894 * wait for a second GPE to signal the completion of the
895 * event we are actually waiting for.
896 */
897 Status = EcCheckStatus(sc, "sleep", Event);
898 if (ACPI_SUCCESS(Status)) {
899 if (gen_count == sc->ec_gencount)
900 no_intr++;
901 else
902 no_intr = 0;
903 break;
904 }
905 gen_count = sc->ec_gencount;
906 }
907
908 /*
909 * We finished waiting for the GPE and it never arrived. Try to
910 * read the register once and trust whatever value we got. This is
911 * the best we can do at this point.
912 */
913 if (ACPI_FAILURE(Status))
914 Status = EcCheckStatus(sc, "sleep_end", Event);
915 }
916 if (!need_poll && no_intr > 10) {
917 device_printf(sc->ec_dev,
918 "not getting interrupts, switched to polled mode\n");
919 ec_polled_mode = 1;
920 }
921 if (ACPI_FAILURE(Status))
922 CTR0(KTR_ACPI, "error: ec wait timed out");
923 return (Status);
924 }
925
926 static ACPI_STATUS
927 EcCommand(struct acpi_ec_softc *sc, EC_COMMAND cmd)
928 {
929 ACPI_STATUS status;
930 EC_EVENT event;
931 EC_STATUS ec_status;
932 u_int gen_count;
933
934 ACPI_SERIAL_ASSERT(ec);
935
936 /* Don't use burst mode if user disabled it. */
937 if (!ec_burst_mode && cmd == EC_COMMAND_BURST_ENABLE)
938 return (AE_ERROR);
939
940 /* Decide what to wait for based on command type. */
941 switch (cmd) {
942 case EC_COMMAND_READ:
943 case EC_COMMAND_WRITE:
944 case EC_COMMAND_BURST_DISABLE:
945 event = EC_EVENT_INPUT_BUFFER_EMPTY;
946 break;
947 case EC_COMMAND_QUERY:
948 case EC_COMMAND_BURST_ENABLE:
949 event = EC_EVENT_OUTPUT_BUFFER_FULL;
950 break;
951 default:
952 device_printf(sc->ec_dev, "EcCommand: invalid command %#x\n", cmd);
953 return (AE_BAD_PARAMETER);
954 }
955
956 /*
957 * Ensure empty input buffer before issuing command.
958 * Use generation count of zero to force a quick check.
959 */
960 status = EcWaitEvent(sc, EC_EVENT_INPUT_BUFFER_EMPTY, 0);
961 if (ACPI_FAILURE(status))
962 return (status);
963
964 /* Run the command and wait for the chosen event. */
965 CTR1(KTR_ACPI, "ec running command %#x", cmd);
966 gen_count = sc->ec_gencount;
967 EC_SET_CSR(sc, cmd);
968 status = EcWaitEvent(sc, event, gen_count);
969 if (ACPI_SUCCESS(status)) {
970 /* If we succeeded, burst flag should now be present. */
971 if (cmd == EC_COMMAND_BURST_ENABLE) {
972 ec_status = EC_GET_CSR(sc);
973 if ((ec_status & EC_FLAG_BURST_MODE) == 0)
974 status = AE_ERROR;
975 }
976 } else
977 device_printf(sc->ec_dev, "EcCommand: no response to %#x\n", cmd);
978 return (status);
979 }
980
981 static ACPI_STATUS
982 EcRead(struct acpi_ec_softc *sc, UINT8 Address, UINT8 *Data)
983 {
984 ACPI_STATUS status;
985 u_int gen_count;
986 int retry;
987
988 ACPI_SERIAL_ASSERT(ec);
989 CTR1(KTR_ACPI, "ec read from %#x", Address);
990
991 for (retry = 0; retry < 2; retry++) {
992 status = EcCommand(sc, EC_COMMAND_READ);
993 if (ACPI_FAILURE(status))
994 return (status);
995
996 gen_count = sc->ec_gencount;
997 EC_SET_DATA(sc, Address);
998 status = EcWaitEvent(sc, EC_EVENT_OUTPUT_BUFFER_FULL, gen_count);
999 if (ACPI_SUCCESS(status)) {
1000 *Data = EC_GET_DATA(sc);
1001 return (AE_OK);
1002 }
1003 if (ACPI_FAILURE(EcCheckStatus(sc, "retr_check",
1004 EC_EVENT_INPUT_BUFFER_EMPTY)))
1005 break;
1006 }
1007 device_printf(sc->ec_dev, "EcRead: failed waiting to get data\n");
1008 return (status);
1009 }
1010
1011 static ACPI_STATUS
1012 EcWrite(struct acpi_ec_softc *sc, UINT8 Address, UINT8 Data)
1013 {
1014 ACPI_STATUS status;
1015 u_int gen_count;
1016
1017 ACPI_SERIAL_ASSERT(ec);
1018 CTR2(KTR_ACPI, "ec write to %#x, data %#x", Address, Data);
1019
1020 status = EcCommand(sc, EC_COMMAND_WRITE);
1021 if (ACPI_FAILURE(status))
1022 return (status);
1023
1024 gen_count = sc->ec_gencount;
1025 EC_SET_DATA(sc, Address);
1026 status = EcWaitEvent(sc, EC_EVENT_INPUT_BUFFER_EMPTY, gen_count);
1027 if (ACPI_FAILURE(status)) {
1028 device_printf(sc->ec_dev, "EcWrite: failed waiting for sent address\n");
1029 return (status);
1030 }
1031
1032 gen_count = sc->ec_gencount;
1033 EC_SET_DATA(sc, Data);
1034 status = EcWaitEvent(sc, EC_EVENT_INPUT_BUFFER_EMPTY, gen_count);
1035 if (ACPI_FAILURE(status)) {
1036 device_printf(sc->ec_dev, "EcWrite: failed waiting for sent data\n");
1037 return (status);
1038 }
1039
1040 return (AE_OK);
1041 }
Cache object: 542493b317aa972c72e87faaa8695af0
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