2 * Copyright (c) 2003-2007 Nate Lawson
3 * Copyright (c) 2000 Michael Smith
4 * Copyright (c) 2000 BSDi
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
28 * $FreeBSD: src/sys/dev/acpica/acpi_ec.c,v 1.76.2.1.6.1 2009/04/15 03:14:26 kensmith Exp $
32 #include <sys/param.h>
33 #include <sys/kernel.h>
36 #include <sys/malloc.h>
37 #include <sys/module.h>
41 #include <dev/acpica/acpivar.h>
44 /* Hooks for the ACPI CA debugging infrastructure */
45 #define _COMPONENT ACPI_EC
46 ACPI_MODULE_NAME("EC")
54 typedef UINT8 EC_COMMAND;
56 #define EC_COMMAND_UNKNOWN ((EC_COMMAND) 0x00)
57 #define EC_COMMAND_READ ((EC_COMMAND) 0x80)
58 #define EC_COMMAND_WRITE ((EC_COMMAND) 0x81)
59 #define EC_COMMAND_BURST_ENABLE ((EC_COMMAND) 0x82)
60 #define EC_COMMAND_BURST_DISABLE ((EC_COMMAND) 0x83)
61 #define EC_COMMAND_QUERY ((EC_COMMAND) 0x84)
66 * The encoding of the EC status register is illustrated below.
67 * Note that a set bit (1) indicates the property is TRUE
68 * (e.g. if bit 0 is set then the output buffer is full).
73 * | | | | | | | +- Output Buffer Full?
74 * | | | | | | +--- Input Buffer Full?
75 * | | | | | +----- <reserved>
76 * | | | | +------- Data Register is Command Byte?
77 * | | | +--------- Burst Mode Enabled?
78 * | | +----------- SCI Event?
79 * | +------------- SMI Event?
80 * +--------------- <reserved>
83 typedef UINT8 EC_STATUS;
85 #define EC_FLAG_OUTPUT_BUFFER ((EC_STATUS) 0x01)
86 #define EC_FLAG_INPUT_BUFFER ((EC_STATUS) 0x02)
87 #define EC_FLAG_DATA_IS_CMD ((EC_STATUS) 0x08)
88 #define EC_FLAG_BURST_MODE ((EC_STATUS) 0x10)
94 typedef UINT8 EC_EVENT;
96 #define EC_EVENT_UNKNOWN ((EC_EVENT) 0x00)
97 #define EC_EVENT_OUTPUT_BUFFER_FULL ((EC_EVENT) 0x01)
98 #define EC_EVENT_INPUT_BUFFER_EMPTY ((EC_EVENT) 0x02)
99 #define EC_EVENT_SCI ((EC_EVENT) 0x20)
100 #define EC_EVENT_SMI ((EC_EVENT) 0x40)
102 /* Data byte returned after burst enable indicating it was successful. */
103 #define EC_BURST_ACK 0x90
106 * Register access primitives
108 #define EC_GET_DATA(sc) \
109 bus_space_read_1((sc)->ec_data_tag, (sc)->ec_data_handle, 0)
111 #define EC_SET_DATA(sc, v) \
112 bus_space_write_1((sc)->ec_data_tag, (sc)->ec_data_handle, 0, (v))
114 #define EC_GET_CSR(sc) \
115 bus_space_read_1((sc)->ec_csr_tag, (sc)->ec_csr_handle, 0)
117 #define EC_SET_CSR(sc, v) \
118 bus_space_write_1((sc)->ec_csr_tag, (sc)->ec_csr_handle, 0, (v))
120 /* Additional params to pass from the probe routine */
121 struct acpi_ec_params {
124 ACPI_HANDLE gpe_handle;
131 struct acpi_ec_softc {
133 ACPI_HANDLE ec_handle;
135 ACPI_HANDLE ec_gpehandle;
139 struct resource *ec_data_res;
140 bus_space_tag_t ec_data_tag;
141 bus_space_handle_t ec_data_handle;
144 struct resource *ec_csr_res;
145 bus_space_tag_t ec_csr_tag;
146 bus_space_handle_t ec_csr_handle;
152 volatile u_int ec_gencount;
158 * I couldn't find it in the spec but other implementations also use a
159 * value of 1 ms for the time to acquire global lock.
161 #define EC_LOCK_TIMEOUT 1000
163 /* Default delay in microseconds between each run of the status polling loop. */
164 #define EC_POLL_DELAY 50
166 /* Total time in ms spent waiting for a response from EC. */
167 #define EC_TIMEOUT 750
169 #define EVENT_READY(event, status) \
170 (((event) == EC_EVENT_OUTPUT_BUFFER_FULL && \
171 ((status) & EC_FLAG_OUTPUT_BUFFER) != 0) || \
172 ((event) == EC_EVENT_INPUT_BUFFER_EMPTY && \
173 ((status) & EC_FLAG_INPUT_BUFFER) == 0))
175 ACPI_SERIAL_DECL(ec, "ACPI embedded controller");
177 SYSCTL_NODE(_debug_acpi, OID_AUTO, ec, CTLFLAG_RD, NULL, "EC debugging");
179 static int ec_burst_mode;
180 TUNABLE_INT("debug.acpi.ec.burst", &ec_burst_mode);
181 SYSCTL_INT(_debug_acpi_ec, OID_AUTO, burst, CTLFLAG_RW, &ec_burst_mode, 0,
182 "Enable use of burst mode (faster for nearly all systems)");
183 static int ec_polled_mode;
184 TUNABLE_INT("debug.acpi.ec.polled", &ec_polled_mode);
185 SYSCTL_INT(_debug_acpi_ec, OID_AUTO, polled, CTLFLAG_RW, &ec_polled_mode, 0,
186 "Force use of polled mode (only if interrupt mode doesn't work)");
187 static int ec_timeout = EC_TIMEOUT;
188 TUNABLE_INT("debug.acpi.ec.timeout", &ec_timeout);
189 SYSCTL_INT(_debug_acpi_ec, OID_AUTO, timeout, CTLFLAG_RW, &ec_timeout,
190 EC_TIMEOUT, "Total time spent waiting for a response (poll+sleep)");
193 EcLock(struct acpi_ec_softc *sc)
197 ACPI_SERIAL_BEGIN(ec);
198 /* If _GLK is non-zero, acquire the global lock. */
201 status = AcpiAcquireGlobalLock(EC_LOCK_TIMEOUT, &sc->ec_glkhandle);
202 if (ACPI_FAILURE(status))
209 EcUnlock(struct acpi_ec_softc *sc)
212 AcpiReleaseGlobalLock(sc->ec_glkhandle);
216 static uint32_t EcGpeHandler(ACPI_HANDLE GpeDevice,
217 UINT32 GpeNumber, void *Context);
218 static ACPI_STATUS EcSpaceSetup(ACPI_HANDLE Region, UINT32 Function,
219 void *Context, void **return_Context);
220 static ACPI_STATUS EcSpaceHandler(UINT32 Function,
221 ACPI_PHYSICAL_ADDRESS Address,
222 UINT32 Width, UINT64 *Value,
223 void *Context, void *RegionContext);
224 static ACPI_STATUS EcWaitEvent(struct acpi_ec_softc *sc, EC_EVENT Event,
226 static ACPI_STATUS EcCommand(struct acpi_ec_softc *sc, EC_COMMAND cmd);
227 static ACPI_STATUS EcRead(struct acpi_ec_softc *sc, UINT8 Address,
229 static ACPI_STATUS EcWrite(struct acpi_ec_softc *sc, UINT8 Address,
231 static int acpi_ec_probe(device_t dev);
232 static int acpi_ec_attach(device_t dev);
233 static int acpi_ec_suspend(device_t dev);
234 static int acpi_ec_resume(device_t dev);
235 static int acpi_ec_shutdown(device_t dev);
236 static int acpi_ec_read_method(device_t dev, u_int addr,
237 UINT64 *val, int width);
238 static int acpi_ec_write_method(device_t dev, u_int addr,
239 UINT64 val, int width);
241 static device_method_t acpi_ec_methods[] = {
242 /* Device interface */
243 DEVMETHOD(device_probe, acpi_ec_probe),
244 DEVMETHOD(device_attach, acpi_ec_attach),
245 DEVMETHOD(device_suspend, acpi_ec_suspend),
246 DEVMETHOD(device_resume, acpi_ec_resume),
247 DEVMETHOD(device_shutdown, acpi_ec_shutdown),
249 /* Embedded controller interface */
250 DEVMETHOD(acpi_ec_read, acpi_ec_read_method),
251 DEVMETHOD(acpi_ec_write, acpi_ec_write_method),
256 static driver_t acpi_ec_driver = {
259 sizeof(struct acpi_ec_softc),
262 static devclass_t acpi_ec_devclass;
263 DRIVER_MODULE(acpi_ec, acpi, acpi_ec_driver, acpi_ec_devclass, NULL, NULL);
264 MODULE_DEPEND(acpi_ec, acpi, 1, 1, 1);
267 * Look for an ECDT and if we find one, set up default GPE and
268 * space handlers to catch attempts to access EC space before
269 * we have a real driver instance in place.
271 * TODO: Some old Gateway laptops need us to fake up an ECDT or
272 * otherwise attach early so that _REG methods can run.
275 acpi_ec_ecdt_probe(device_t parent)
277 ACPI_TABLE_ECDT *ecdt;
281 struct acpi_ec_params *params;
283 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
285 /* Find and validate the ECDT. */
286 status = AcpiGetTable(ACPI_SIG_ECDT, 1, (ACPI_TABLE_HEADER **)&ecdt);
287 if (ACPI_FAILURE(status) ||
288 ecdt->Control.BitWidth != 8 ||
289 ecdt->Data.BitWidth != 8) {
293 /* Create the child device with the given unit number. */
294 child = BUS_ADD_CHILD(parent, parent, 0, "acpi_ec", ecdt->Uid);
296 kprintf("%s: can't add child\n", __func__);
300 /* Find and save the ACPI handle for this device. */
301 status = AcpiGetHandle(NULL, ecdt->Id, &h);
302 if (ACPI_FAILURE(status)) {
303 device_delete_child(parent, child);
304 kprintf("%s: can't get handle\n", __func__);
307 acpi_set_handle(child, h);
309 /* Set the data and CSR register addresses. */
310 bus_set_resource(child, SYS_RES_IOPORT, 0, ecdt->Data.Address,
312 bus_set_resource(child, SYS_RES_IOPORT, 1, ecdt->Control.Address,
316 * Store values for the probe/attach routines to use. Store the
317 * ECDT GPE bit and set the global lock flag according to _GLK.
318 * Note that it is not perfectly correct to be evaluating a method
319 * before initializing devices, but in practice this function
320 * should be safe to call at this point.
322 params = kmalloc(sizeof(struct acpi_ec_params), M_TEMP, M_WAITOK | M_ZERO);
323 params->gpe_handle = NULL;
324 params->gpe_bit = ecdt->Gpe;
325 params->uid = ecdt->Uid;
326 acpi_GetInteger(h, "_GLK", ¶ms->glk);
327 acpi_set_private(child, params);
329 /* Finish the attach process. */
330 if (device_probe_and_attach(child) != 0)
331 device_delete_child(parent, child);
335 acpi_ec_probe(device_t dev)
345 struct acpi_ec_params *params;
346 static char *ec_ids[] = { "PNP0C09", NULL };
348 /* Check that this is a device and that EC is not disabled. */
349 if (acpi_get_type(dev) != ACPI_TYPE_DEVICE || acpi_disabled("ec"))
353 * If probed via ECDT, set description and continue. Otherwise,
354 * we can access the namespace and make sure this is not a
360 buf.Length = ACPI_ALLOCATE_BUFFER;
361 params = acpi_get_private(dev);
362 if (params != NULL) {
365 } else if (ACPI_ID_PROBE(device_get_parent(dev), dev, ec_ids)) {
366 params = kmalloc(sizeof(struct acpi_ec_params), M_TEMP,
368 h = acpi_get_handle(dev);
371 * Read the unit ID to check for duplicate attach and the
372 * global lock value to see if we should acquire it when
375 status = acpi_GetInteger(h, "_UID", ¶ms->uid);
376 if (ACPI_FAILURE(status))
378 status = acpi_GetInteger(h, "_GLK", ¶ms->glk);
379 if (ACPI_FAILURE(status))
383 * Evaluate the _GPE method to find the GPE bit used by the EC to
384 * signal status (SCI). If it's a package, it contains a reference
385 * and GPE bit, similar to _PRW.
387 status = AcpiEvaluateObject(h, "_GPE", NULL, &buf);
388 if (ACPI_FAILURE(status)) {
389 device_printf(dev, "can't evaluate _GPE - %s\n",
390 AcpiFormatException(status));
393 obj = (ACPI_OBJECT *)buf.Pointer;
398 case ACPI_TYPE_INTEGER:
399 params->gpe_handle = NULL;
400 params->gpe_bit = obj->Integer.Value;
402 case ACPI_TYPE_PACKAGE:
403 if (!ACPI_PKG_VALID(obj, 2))
406 acpi_GetReference(NULL, &obj->Package.Elements[0]);
407 if (params->gpe_handle == NULL ||
408 acpi_PkgInt32(obj, 1, ¶ms->gpe_bit) != 0)
412 device_printf(dev, "_GPE has invalid type %d\n", obj->Type);
416 /* Store the values we got from the namespace for attach. */
417 acpi_set_private(dev, params);
420 * Check for a duplicate probe. This can happen when a probe
421 * via ECDT succeeded already. If this is a duplicate, disable
424 peer = devclass_get_device(acpi_ec_devclass, params->uid);
425 if (peer == NULL || !device_is_alive(peer))
433 ksnprintf(desc, sizeof(desc), "Embedded Controller: GPE %#x%s%s",
434 params->gpe_bit, (params->glk) ? ", GLK" : "",
435 ecdt ? ", ECDT" : "");
436 device_set_desc_copy(dev, desc);
439 if (ret > 0 && params)
440 kfree(params, M_TEMP);
442 AcpiOsFree(buf.Pointer);
447 acpi_ec_attach(device_t dev)
449 struct acpi_ec_softc *sc;
450 struct acpi_ec_params *params;
453 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
455 /* Fetch/initialize softc (assumes softc is pre-zeroed). */
456 sc = device_get_softc(dev);
457 params = acpi_get_private(dev);
459 sc->ec_handle = acpi_get_handle(dev);
460 ACPI_SERIAL_INIT(ec);
462 /* Retrieve previously probed values via device ivars. */
463 sc->ec_glk = params->glk;
464 sc->ec_gpebit = params->gpe_bit;
465 sc->ec_gpehandle = params->gpe_handle;
466 sc->ec_uid = params->uid;
467 sc->ec_suspending = FALSE;
468 acpi_set_private(dev, NULL);
469 kfree(params, M_TEMP);
471 /* Attach bus resources for data and command/status ports. */
473 sc->ec_data_res = bus_alloc_resource_any(sc->ec_dev, SYS_RES_IOPORT,
474 &sc->ec_data_rid, RF_ACTIVE);
475 if (sc->ec_data_res == NULL) {
476 device_printf(dev, "can't allocate data port\n");
479 sc->ec_data_tag = rman_get_bustag(sc->ec_data_res);
480 sc->ec_data_handle = rman_get_bushandle(sc->ec_data_res);
483 sc->ec_csr_res = bus_alloc_resource_any(sc->ec_dev, SYS_RES_IOPORT,
484 &sc->ec_csr_rid, RF_ACTIVE);
485 if (sc->ec_csr_res == NULL) {
486 device_printf(dev, "can't allocate command/status port\n");
489 sc->ec_csr_tag = rman_get_bustag(sc->ec_csr_res);
490 sc->ec_csr_handle = rman_get_bushandle(sc->ec_csr_res);
493 * Install a handler for this EC's GPE bit. We want edge-triggered
496 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "attaching GPE handler\n"));
497 Status = AcpiInstallGpeHandler(sc->ec_gpehandle, sc->ec_gpebit,
498 ACPI_GPE_EDGE_TRIGGERED, &EcGpeHandler, sc);
499 if (ACPI_FAILURE(Status)) {
500 device_printf(dev, "can't install GPE handler for %s - %s\n",
501 acpi_name(sc->ec_handle), AcpiFormatException(Status));
506 * Install address space handler
508 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "attaching address space handler\n"));
509 Status = AcpiInstallAddressSpaceHandler(sc->ec_handle, ACPI_ADR_SPACE_EC,
510 &EcSpaceHandler, &EcSpaceSetup, sc);
511 if (ACPI_FAILURE(Status)) {
512 device_printf(dev, "can't install address space handler for %s - %s\n",
513 acpi_name(sc->ec_handle), AcpiFormatException(Status));
517 /* Enable runtime GPEs for the handler */
518 Status = AcpiEnableGpe(sc->ec_gpehandle, sc->ec_gpebit);
519 if (ACPI_FAILURE(Status)) {
520 device_printf(dev, "AcpiEnableGpe failed: %s\n",
521 AcpiFormatException(Status));
525 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "acpi_ec_attach complete\n"));
529 AcpiRemoveGpeHandler(sc->ec_gpehandle, sc->ec_gpebit, &EcGpeHandler);
530 AcpiRemoveAddressSpaceHandler(sc->ec_handle, ACPI_ADR_SPACE_EC,
533 bus_release_resource(sc->ec_dev, SYS_RES_IOPORT, sc->ec_csr_rid,
536 bus_release_resource(sc->ec_dev, SYS_RES_IOPORT, sc->ec_data_rid,
542 acpi_ec_suspend(device_t dev)
544 struct acpi_ec_softc *sc;
546 sc = device_get_softc(dev);
547 sc->ec_suspending = TRUE;
552 acpi_ec_resume(device_t dev)
554 struct acpi_ec_softc *sc;
556 sc = device_get_softc(dev);
557 sc->ec_suspending = FALSE;
562 acpi_ec_shutdown(device_t dev)
564 struct acpi_ec_softc *sc;
566 /* Disable the GPE so we don't get EC events during shutdown. */
567 sc = device_get_softc(dev);
568 AcpiDisableGpe(sc->ec_gpehandle, sc->ec_gpebit);
572 /* Methods to allow other devices (e.g., smbat) to read/write EC space. */
574 acpi_ec_read_method(device_t dev, u_int addr, UINT64 *val, int width)
576 struct acpi_ec_softc *sc;
579 sc = device_get_softc(dev);
580 status = EcSpaceHandler(ACPI_READ, addr, width * 8, val, sc, NULL);
581 if (ACPI_FAILURE(status))
587 acpi_ec_write_method(device_t dev, u_int addr, UINT64 val, int width)
589 struct acpi_ec_softc *sc;
592 sc = device_get_softc(dev);
593 status = EcSpaceHandler(ACPI_WRITE, addr, width * 8, &val, sc, NULL);
594 if (ACPI_FAILURE(status))
600 EcCheckStatus(struct acpi_ec_softc *sc, const char *msg, EC_EVENT event)
605 status = AE_NO_HARDWARE_RESPONSE;
606 ec_status = EC_GET_CSR(sc);
607 if (sc->ec_burstactive && !(ec_status & EC_FLAG_BURST_MODE)) {
608 sc->ec_burstactive = FALSE;
610 if (EVENT_READY(event, ec_status)) {
617 EcGpeQueryHandler(void *Context)
619 struct acpi_ec_softc *sc = (struct acpi_ec_softc *)Context;
622 int retry, sci_enqueued;
625 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
626 KASSERT(Context != NULL, ("EcGpeQueryHandler called with NULL"));
628 /* Serialize user access with EcSpaceHandler(). */
630 if (ACPI_FAILURE(Status)) {
631 device_printf(sc->ec_dev, "GpeQuery lock error: %s\n",
632 AcpiFormatException(Status));
637 * Send a query command to the EC to find out which _Qxx call it
638 * wants to make. This command clears the SCI bit and also the
639 * interrupt source since we are edge-triggered. To prevent the GPE
640 * that may arise from running the query from causing another query
641 * to be queued, we clear the pending flag only after running it.
643 sci_enqueued = sc->ec_sci_pend;
644 for (retry = 0; retry < 2; retry++) {
645 Status = EcCommand(sc, EC_COMMAND_QUERY);
646 if (ACPI_SUCCESS(Status))
648 if (EcCheckStatus(sc, "retr_check",
649 EC_EVENT_INPUT_BUFFER_EMPTY) == AE_OK)
654 sc->ec_sci_pend = FALSE;
655 if (ACPI_FAILURE(Status)) {
657 device_printf(sc->ec_dev, "GPE query failed: %s\n",
658 AcpiFormatException(Status));
661 Data = EC_GET_DATA(sc);
664 * We have to unlock before running the _Qxx method below since that
665 * method may attempt to read/write from EC address space, causing
666 * recursive acquisition of the lock.
670 /* Ignore the value for "no outstanding event". (13.3.5) */
674 /* Evaluate _Qxx to respond to the controller. */
675 ksnprintf(qxx, sizeof(qxx), "_Q%02X", Data);
677 Status = AcpiEvaluateObject(sc->ec_handle, qxx, NULL, NULL);
678 if (ACPI_FAILURE(Status) && Status != AE_NOT_FOUND) {
679 device_printf(sc->ec_dev, "evaluation of query method %s failed: %s\n",
680 qxx, AcpiFormatException(Status));
683 /* Reenable runtime GPE if its execution was deferred. */
685 Status = AcpiFinishGpe(sc->ec_gpehandle, sc->ec_gpebit);
686 if (ACPI_FAILURE(Status))
687 device_printf(sc->ec_dev, "reenabling runtime GPE failed: %s\n",
688 AcpiFormatException(Status));
693 * The GPE handler is called when IBE/OBF or SCI events occur. We are
694 * called from an unknown lock context.
697 EcGpeHandler(ACPI_HANDLE GpeDevice, UINT32 GpeNumber, void *Context)
699 struct acpi_ec_softc *sc = Context;
703 KASSERT(Context != NULL, ("EcGpeHandler called with NULL"));
705 * Notify EcWaitEvent() that the status register is now fresh. If we
706 * didn't do this, it wouldn't be possible to distinguish an old IBE
707 * from a new one, for example when doing a write transaction (writing
708 * address and then data values.)
710 atomic_add_int(&sc->ec_gencount, 1);
714 * If the EC_SCI bit of the status register is set, queue a query handler.
715 * It will run the query and _Qxx method later, under the lock.
717 EcStatus = EC_GET_CSR(sc);
718 if ((EcStatus & EC_EVENT_SCI) && !sc->ec_sci_pend) {
719 Status = AcpiOsExecute(OSL_GPE_HANDLER, EcGpeQueryHandler, Context);
720 if (ACPI_SUCCESS(Status)) {
721 sc->ec_sci_pend = TRUE;
724 kprintf("EcGpeHandler: queuing GPE query handler failed\n");
727 return (ACPI_REENABLE_GPE);
731 EcSpaceSetup(ACPI_HANDLE Region, UINT32 Function, void *Context,
732 void **RegionContext)
735 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
738 * If deactivating a region, always set the output to NULL. Otherwise,
739 * just pass the context through.
741 if (Function == ACPI_REGION_DEACTIVATE)
742 *RegionContext = NULL;
744 *RegionContext = Context;
746 return_ACPI_STATUS (AE_OK);
750 EcSpaceHandler(UINT32 Function, ACPI_PHYSICAL_ADDRESS Address, UINT32 Width,
751 UINT64 *Value, void *Context, void *RegionContext)
753 struct acpi_ec_softc *sc = (struct acpi_ec_softc *)Context;
754 ACPI_PHYSICAL_ADDRESS EcAddr;
758 ACPI_FUNCTION_TRACE_U32((char *)(uintptr_t)__func__, (UINT32)Address);
760 if (Function != ACPI_READ && Function != ACPI_WRITE)
761 return_ACPI_STATUS (AE_BAD_PARAMETER);
762 if (Width % 8 != 0 || Value == NULL || Context == NULL)
763 return_ACPI_STATUS (AE_BAD_PARAMETER);
764 if (Address + Width / 8 > 256)
765 return_ACPI_STATUS (AE_BAD_ADDRESS);
768 * If booting, check if we need to run the query handler. If so, we
769 * we call it directly here since our thread taskq is not active yet.
771 if (cold || rebooting || sc->ec_suspending) {
772 if ((EC_GET_CSR(sc) & EC_EVENT_SCI)) {
773 EcGpeQueryHandler(sc);
777 /* Serialize with EcGpeQueryHandler() at transaction granularity. */
779 if (ACPI_FAILURE(Status))
780 return_ACPI_STATUS (Status);
782 /* If we can't start burst mode, continue anyway. */
783 Status = EcCommand(sc, EC_COMMAND_BURST_ENABLE);
784 if (ACPI_SUCCESS(Status)) {
785 if (EC_GET_DATA(sc) == EC_BURST_ACK) {
786 sc->ec_burstactive = TRUE;
790 /* Perform the transaction(s), based on Width. */
792 EcData = (UINT8 *)Value;
793 if (Function == ACPI_READ)
798 Status = EcRead(sc, EcAddr, EcData);
801 Status = EcWrite(sc, EcAddr, *EcData);
804 if (ACPI_FAILURE(Status))
808 } while (EcAddr < Address + Width / 8);
810 if (sc->ec_burstactive) {
811 sc->ec_burstactive = FALSE;
812 if (ACPI_SUCCESS(EcCommand(sc, EC_COMMAND_BURST_DISABLE))) {
817 return_ACPI_STATUS (Status);
821 EcWaitEvent(struct acpi_ec_softc *sc, EC_EVENT Event, u_int gen_count)
823 static int no_intr = 0;
825 int count, i, need_poll, slp_ival;
827 ACPI_SERIAL_ASSERT(ec);
828 Status = AE_NO_HARDWARE_RESPONSE;
829 need_poll = cold || rebooting || ec_polled_mode || sc->ec_suspending;
831 /* Wait for event by polling or GPE (interrupt). */
833 count = (ec_timeout * 1000) / EC_POLL_DELAY;
837 for (i = 0; i < count; i++) {
838 Status = EcCheckStatus(sc, "poll", Event);
841 DELAY(EC_POLL_DELAY);
844 slp_ival = hz / 1000;
848 /* hz has less than 1 ms resolution so scale timeout. */
850 count = ec_timeout / (1000 / hz);
854 * Wait for the GPE to signal the status changed, checking the
855 * status register each time we get one. It's possible to get a
856 * GPE for an event we're not interested in here (i.e., SCI for
859 for (i = 0; i < count; i++) {
860 if (gen_count == sc->ec_gencount)
861 tsleep(sc, 0, "ecgpe", slp_ival);
863 * Record new generation count. It's possible the GPE was
864 * just to notify us that a query is needed and we need to
865 * wait for a second GPE to signal the completion of the
866 * event we are actually waiting for.
868 Status = EcCheckStatus(sc, "sleep", Event);
869 if (Status == AE_OK) {
870 if (gen_count == sc->ec_gencount)
876 gen_count = sc->ec_gencount;
880 * We finished waiting for the GPE and it never arrived. Try to
881 * read the register once and trust whatever value we got. This is
882 * the best we can do at this point.
885 Status = EcCheckStatus(sc, "sleep_end", Event);
887 if (!need_poll && no_intr > 10) {
888 device_printf(sc->ec_dev,
889 "not getting interrupts, switched to polled mode\n");
896 EcCommand(struct acpi_ec_softc *sc, EC_COMMAND cmd)
903 ACPI_SERIAL_ASSERT(ec);
905 /* Don't use burst mode if user disabled it. */
906 if (!ec_burst_mode && cmd == EC_COMMAND_BURST_ENABLE)
909 /* Decide what to wait for based on command type. */
911 case EC_COMMAND_READ:
912 case EC_COMMAND_WRITE:
913 case EC_COMMAND_BURST_DISABLE:
914 event = EC_EVENT_INPUT_BUFFER_EMPTY;
916 case EC_COMMAND_QUERY:
917 case EC_COMMAND_BURST_ENABLE:
918 event = EC_EVENT_OUTPUT_BUFFER_FULL;
921 device_printf(sc->ec_dev, "EcCommand: invalid command %#x\n", cmd);
922 return (AE_BAD_PARAMETER);
926 * Ensure empty input buffer before issuing command.
927 * Use generation count of zero to force a quick check.
929 status = EcWaitEvent(sc, EC_EVENT_INPUT_BUFFER_EMPTY, 0);
930 if (ACPI_FAILURE(status))
933 /* Run the command and wait for the chosen event. */
934 gen_count = sc->ec_gencount;
936 status = EcWaitEvent(sc, event, gen_count);
937 if (ACPI_SUCCESS(status)) {
938 /* If we succeeded, burst flag should now be present. */
939 if (cmd == EC_COMMAND_BURST_ENABLE) {
940 ec_status = EC_GET_CSR(sc);
941 if ((ec_status & EC_FLAG_BURST_MODE) == 0)
945 device_printf(sc->ec_dev, "EcCommand: no response to %#x\n", cmd);
950 EcRead(struct acpi_ec_softc *sc, UINT8 Address, UINT8 *Data)
956 ACPI_SERIAL_ASSERT(ec);
958 for (retry = 0; retry < 2; retry++) {
959 status = EcCommand(sc, EC_COMMAND_READ);
960 if (ACPI_FAILURE(status))
963 gen_count = sc->ec_gencount;
964 EC_SET_DATA(sc, Address);
965 status = EcWaitEvent(sc, EC_EVENT_OUTPUT_BUFFER_FULL, gen_count);
966 if (ACPI_FAILURE(status)) {
967 if (EcCheckStatus(sc, "retr_check",
968 EC_EVENT_INPUT_BUFFER_EMPTY) == AE_OK)
973 *Data = EC_GET_DATA(sc);
976 device_printf(sc->ec_dev, "EcRead: failed waiting to get data\n");
981 EcWrite(struct acpi_ec_softc *sc, UINT8 Address, UINT8 Data)
986 ACPI_SERIAL_ASSERT(ec);
988 status = EcCommand(sc, EC_COMMAND_WRITE);
989 if (ACPI_FAILURE(status))
992 gen_count = sc->ec_gencount;
993 EC_SET_DATA(sc, Address);
994 status = EcWaitEvent(sc, EC_EVENT_INPUT_BUFFER_EMPTY, gen_count);
995 if (ACPI_FAILURE(status)) {
996 device_printf(sc->ec_dev, "EcWrite: failed waiting for sent address\n");
1000 gen_count = sc->ec_gencount;
1001 EC_SET_DATA(sc, Data);
1002 status = EcWaitEvent(sc, EC_EVENT_INPUT_BUFFER_EMPTY, gen_count);
1003 if (ACPI_FAILURE(status)) {
1004 device_printf(sc->ec_dev, "EcWrite: failed waiting for sent data\n");