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
27 * __FBSDID("$FreeBSD: src/sys/dev/acpica/acpi_ec.c,v 1.76.2.1.6.1 2009/04/15 03:14:26 kensmith Exp $");
30 #include <sys/cdefs.h>
33 #include <sys/param.h>
34 #include <sys/kernel.h>
37 #include <sys/malloc.h>
38 #include <sys/module.h>
42 #include <dev/acpica5/acpivar.h>
45 /* Hooks for the ACPI CA debugging infrastructure */
46 #define _COMPONENT ACPI_EC
47 ACPI_MODULE_NAME("EC")
55 typedef UINT8 EC_COMMAND;
57 #define EC_COMMAND_UNKNOWN ((EC_COMMAND) 0x00)
58 #define EC_COMMAND_READ ((EC_COMMAND) 0x80)
59 #define EC_COMMAND_WRITE ((EC_COMMAND) 0x81)
60 #define EC_COMMAND_BURST_ENABLE ((EC_COMMAND) 0x82)
61 #define EC_COMMAND_BURST_DISABLE ((EC_COMMAND) 0x83)
62 #define EC_COMMAND_QUERY ((EC_COMMAND) 0x84)
67 * The encoding of the EC status register is illustrated below.
68 * Note that a set bit (1) indicates the property is TRUE
69 * (e.g. if bit 0 is set then the output buffer is full).
74 * | | | | | | | +- Output Buffer Full?
75 * | | | | | | +--- Input Buffer Full?
76 * | | | | | +----- <reserved>
77 * | | | | +------- Data Register is Command Byte?
78 * | | | +--------- Burst Mode Enabled?
79 * | | +----------- SCI Event?
80 * | +------------- SMI Event?
81 * +--------------- <reserved>
84 typedef UINT8 EC_STATUS;
86 #define EC_FLAG_OUTPUT_BUFFER ((EC_STATUS) 0x01)
87 #define EC_FLAG_INPUT_BUFFER ((EC_STATUS) 0x02)
88 #define EC_FLAG_DATA_IS_CMD ((EC_STATUS) 0x08)
89 #define EC_FLAG_BURST_MODE ((EC_STATUS) 0x10)
95 typedef UINT8 EC_EVENT;
97 #define EC_EVENT_UNKNOWN ((EC_EVENT) 0x00)
98 #define EC_EVENT_OUTPUT_BUFFER_FULL ((EC_EVENT) 0x01)
99 #define EC_EVENT_INPUT_BUFFER_EMPTY ((EC_EVENT) 0x02)
100 #define EC_EVENT_SCI ((EC_EVENT) 0x20)
101 #define EC_EVENT_SMI ((EC_EVENT) 0x40)
103 /* Data byte returned after burst enable indicating it was successful. */
104 #define EC_BURST_ACK 0x90
107 * Register access primitives
109 #define EC_GET_DATA(sc) \
110 bus_space_read_1((sc)->ec_data_tag, (sc)->ec_data_handle, 0)
112 #define EC_SET_DATA(sc, v) \
113 bus_space_write_1((sc)->ec_data_tag, (sc)->ec_data_handle, 0, (v))
115 #define EC_GET_CSR(sc) \
116 bus_space_read_1((sc)->ec_csr_tag, (sc)->ec_csr_handle, 0)
118 #define EC_SET_CSR(sc, v) \
119 bus_space_write_1((sc)->ec_csr_tag, (sc)->ec_csr_handle, 0, (v))
121 /* Additional params to pass from the probe routine */
122 struct acpi_ec_params {
125 ACPI_HANDLE gpe_handle;
129 /* Indicate that this device has already been probed via ECDT. */
130 #define DEV_ECDT(x) (acpi_get_magic(x) == (uintptr_t)&acpi_ec_devclass)
135 struct acpi_ec_softc {
137 ACPI_HANDLE ec_handle;
139 ACPI_HANDLE ec_gpehandle;
143 struct resource *ec_data_res;
144 bus_space_tag_t ec_data_tag;
145 bus_space_handle_t ec_data_handle;
148 struct resource *ec_csr_res;
149 bus_space_tag_t ec_csr_tag;
150 bus_space_handle_t ec_csr_handle;
162 * I couldn't find it in the spec but other implementations also use a
163 * value of 1 ms for the time to acquire global lock.
165 #define EC_LOCK_TIMEOUT 1000
167 /* Default delay in microseconds between each run of the status polling loop. */
168 #define EC_POLL_DELAY 5000
170 /* Total time in ms spent waiting for a response from EC. */
171 #define EC_TIMEOUT 7500
173 #define EVENT_READY(event, status) \
174 (((event) == EC_EVENT_OUTPUT_BUFFER_FULL && \
175 ((status) & EC_FLAG_OUTPUT_BUFFER) != 0) || \
176 ((event) == EC_EVENT_INPUT_BUFFER_EMPTY && \
177 ((status) & EC_FLAG_INPUT_BUFFER) == 0))
179 ACPI_SERIAL_DECL(ec, "ACPI embedded controller");
181 SYSCTL_DECL(_debug_acpi);
182 SYSCTL_NODE(_debug_acpi, OID_AUTO, ec, CTLFLAG_RD, NULL, "EC debugging");
184 static int ec_burst_mode;
185 TUNABLE_INT("debug.acpi.ec.burst", &ec_burst_mode);
186 SYSCTL_INT(_debug_acpi_ec, OID_AUTO, burst, CTLFLAG_RW, &ec_burst_mode, 0,
187 "Enable use of burst mode (faster for nearly all systems)");
188 static int ec_polled_mode;
189 TUNABLE_INT("debug.acpi.ec.polled", &ec_polled_mode);
190 SYSCTL_INT(_debug_acpi_ec, OID_AUTO, polled, CTLFLAG_RW, &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 TUNABLE_INT("debug.acpi.ec.timeout", &ec_timeout);
194 SYSCTL_INT(_debug_acpi_ec, OID_AUTO, timeout, CTLFLAG_RW, &ec_timeout,
195 EC_TIMEOUT, "Total time spent waiting for a response (poll+sleep)");
198 EcLock(struct acpi_ec_softc *sc)
202 /* If _GLK is non-zero, acquire the global lock. */
205 status = AcpiAcquireGlobalLock(EC_LOCK_TIMEOUT, &sc->ec_glkhandle);
206 if (ACPI_FAILURE(status))
209 ACPI_SERIAL_BEGIN(ec);
214 EcUnlock(struct acpi_ec_softc *sc)
218 AcpiReleaseGlobalLock(sc->ec_glkhandle);
221 static uint32_t EcGpeHandler(void *Context);
222 static ACPI_STATUS EcSpaceSetup(ACPI_HANDLE Region, UINT32 Function,
223 void *Context, void **return_Context);
224 static ACPI_STATUS EcSpaceHandler(UINT32 Function,
225 ACPI_PHYSICAL_ADDRESS Address,
226 UINT32 width, ACPI_INTEGER *Value,
227 void *Context, void *RegionContext);
228 static ACPI_STATUS EcWaitEvent(struct acpi_ec_softc *sc, EC_EVENT Event,
230 static ACPI_STATUS EcCommand(struct acpi_ec_softc *sc, EC_COMMAND cmd);
231 static ACPI_STATUS EcRead(struct acpi_ec_softc *sc, UINT8 Address,
233 static ACPI_STATUS EcWrite(struct acpi_ec_softc *sc, UINT8 Address,
235 static int acpi_ec_probe(device_t dev);
236 static int acpi_ec_attach(device_t dev);
237 static int acpi_ec_suspend(device_t dev);
238 static int acpi_ec_resume(device_t dev);
239 static int acpi_ec_shutdown(device_t dev);
240 static int acpi_ec_read_method(device_t dev, u_int addr,
241 ACPI_INTEGER *val, int width);
242 static int acpi_ec_write_method(device_t dev, u_int addr,
243 ACPI_INTEGER val, int width);
245 static device_method_t acpi_ec_methods[] = {
246 /* Device interface */
247 DEVMETHOD(device_probe, acpi_ec_probe),
248 DEVMETHOD(device_attach, acpi_ec_attach),
249 DEVMETHOD(device_suspend, acpi_ec_suspend),
250 DEVMETHOD(device_resume, acpi_ec_resume),
251 DEVMETHOD(device_shutdown, acpi_ec_shutdown),
253 /* Embedded controller interface */
254 DEVMETHOD(acpi_ec_read, acpi_ec_read_method),
255 DEVMETHOD(acpi_ec_write, acpi_ec_write_method),
260 static driver_t acpi_ec_driver = {
263 sizeof(struct acpi_ec_softc),
266 static devclass_t acpi_ec_devclass;
267 DRIVER_MODULE(acpi_ec, acpi, acpi_ec_driver, acpi_ec_devclass, 0, 0);
268 MODULE_DEPEND(acpi_ec, acpi, 1, 1, 1);
271 * Look for an ECDT and if we find one, set up default GPE and
272 * space handlers to catch attempts to access EC space before
273 * we have a real driver instance in place.
275 * TODO: Some old Gateway laptops need us to fake up an ECDT or
276 * otherwise attach early so that _REG methods can run.
279 acpi_ec_ecdt_probe(device_t parent)
281 ACPI_TABLE_ECDT *ecdt;
285 struct acpi_ec_params *params;
287 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
289 /* Find and validate the ECDT. */
290 status = AcpiGetTable(ACPI_SIG_ECDT, 1, (ACPI_TABLE_HEADER **)&ecdt);
291 if (ACPI_FAILURE(status) ||
292 ecdt->Control.BitWidth != 8 ||
293 ecdt->Data.BitWidth != 8) {
297 /* Create the child device with the given unit number. */
298 child = BUS_ADD_CHILD(parent, parent, 0, "acpi_ec", ecdt->Uid);
300 kprintf("%s: can't add child\n", __func__);
304 /* Find and save the ACPI handle for this device. */
305 status = AcpiGetHandle(NULL, ecdt->Id, &h);
306 if (ACPI_FAILURE(status)) {
307 device_delete_child(parent, child);
308 kprintf("%s: can't get handle\n", __func__);
311 acpi_set_handle(child, h);
313 /* Set the data and CSR register addresses. */
314 bus_set_resource(child, SYS_RES_IOPORT, 0, ecdt->Data.Address,
316 bus_set_resource(child, SYS_RES_IOPORT, 1, ecdt->Control.Address,
320 * Store values for the probe/attach routines to use. Store the
321 * ECDT GPE bit and set the global lock flag according to _GLK.
322 * Note that it is not perfectly correct to be evaluating a method
323 * before initializing devices, but in practice this function
324 * should be safe to call at this point.
326 params = kmalloc(sizeof(struct acpi_ec_params), M_TEMP, M_WAITOK | M_ZERO);
327 params->gpe_handle = NULL;
328 params->gpe_bit = ecdt->Gpe;
329 params->uid = ecdt->Uid;
330 acpi_GetInteger(h, "_GLK", ¶ms->glk);
331 acpi_set_private(child, params);
332 acpi_set_magic(child, (uintptr_t)&acpi_ec_devclass);
334 /* Finish the attach process. */
335 if (device_probe_and_attach(child) != 0)
336 device_delete_child(parent, child);
340 acpi_ec_probe(device_t dev)
349 struct acpi_ec_params *params;
350 static char *ec_ids[] = { "PNP0C09", NULL };
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"))
357 * If probed via ECDT, set description and continue. Otherwise,
358 * we can access the namespace and make sure this is not a
364 buf.Length = ACPI_ALLOCATE_BUFFER;
366 params = acpi_get_private(dev);
368 } else if (!acpi_disabled("ec") &&
369 ACPI_ID_PROBE(device_get_parent(dev), dev, ec_ids)) {
370 params = kmalloc(sizeof(struct acpi_ec_params), M_TEMP,
372 h = acpi_get_handle(dev);
375 * Read the unit ID to check for duplicate attach and the
376 * global lock value to see if we should acquire it when
379 status = acpi_GetInteger(h, "_UID", ¶ms->uid);
380 if (ACPI_FAILURE(status))
382 status = acpi_GetInteger(h, "_GLK", ¶ms->glk);
383 if (ACPI_FAILURE(status))
387 * Evaluate the _GPE method to find the GPE bit used by the EC to
388 * signal status (SCI). If it's a package, it contains a reference
389 * and GPE bit, similar to _PRW.
391 status = AcpiEvaluateObject(h, "_GPE", NULL, &buf);
392 if (ACPI_FAILURE(status)) {
393 device_printf(dev, "can't evaluate _GPE - %s\n",
394 AcpiFormatException(status));
397 obj = (ACPI_OBJECT *)buf.Pointer;
402 case ACPI_TYPE_INTEGER:
403 params->gpe_handle = NULL;
404 params->gpe_bit = obj->Integer.Value;
406 case ACPI_TYPE_PACKAGE:
407 if (!ACPI_PKG_VALID(obj, 2))
410 acpi_GetReference(NULL, &obj->Package.Elements[0]);
411 if (params->gpe_handle == NULL ||
412 acpi_PkgInt32(obj, 1, ¶ms->gpe_bit) != 0)
416 device_printf(dev, "_GPE has invalid type %d\n", obj->Type);
420 /* Store the values we got from the namespace for attach. */
421 acpi_set_private(dev, params);
424 * Check for a duplicate probe. This can happen when a probe
425 * via ECDT succeeded already. If this is a duplicate, disable
428 peer = devclass_get_device(acpi_ec_devclass, params->uid);
429 if (peer == NULL || !device_is_alive(peer))
437 ksnprintf(desc, sizeof(desc), "Embedded Controller: GPE %#x%s%s",
438 params->gpe_bit, (params->glk) ? ", GLK" : "",
439 DEV_ECDT(dev) ? ", ECDT" : "");
440 device_set_desc_copy(dev, desc);
443 if (ret > 0 && params)
444 kfree(params, M_TEMP);
446 AcpiOsFree(buf.Pointer);
451 acpi_ec_attach(device_t dev)
453 struct acpi_ec_softc *sc;
454 struct acpi_ec_params *params;
457 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
459 /* Fetch/initialize softc (assumes softc is pre-zeroed). */
460 sc = device_get_softc(dev);
461 params = acpi_get_private(dev);
463 sc->ec_handle = acpi_get_handle(dev);
465 /* Retrieve previously probed values via device ivars. */
466 sc->ec_glk = params->glk;
467 sc->ec_gpebit = params->gpe_bit;
468 sc->ec_gpehandle = params->gpe_handle;
469 sc->ec_uid = params->uid;
470 sc->ec_suspending = FALSE;
471 kfree(params, M_TEMP);
473 /* Attach bus resources for data and command/status ports. */
475 sc->ec_data_res = bus_alloc_resource_any(sc->ec_dev, SYS_RES_IOPORT,
476 &sc->ec_data_rid, RF_ACTIVE);
477 if (sc->ec_data_res == NULL) {
478 device_printf(dev, "can't allocate data port\n");
481 sc->ec_data_tag = rman_get_bustag(sc->ec_data_res);
482 sc->ec_data_handle = rman_get_bushandle(sc->ec_data_res);
485 sc->ec_csr_res = bus_alloc_resource_any(sc->ec_dev, SYS_RES_IOPORT,
486 &sc->ec_csr_rid, RF_ACTIVE);
487 if (sc->ec_csr_res == NULL) {
488 device_printf(dev, "can't allocate command/status port\n");
491 sc->ec_csr_tag = rman_get_bustag(sc->ec_csr_res);
492 sc->ec_csr_handle = rman_get_bushandle(sc->ec_csr_res);
495 * Install a handler for this EC's GPE bit. We want edge-triggered
498 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "attaching GPE handler\n"));
499 Status = AcpiInstallGpeHandler(sc->ec_gpehandle, sc->ec_gpebit,
500 ACPI_GPE_EDGE_TRIGGERED, &EcGpeHandler, sc);
501 if (ACPI_FAILURE(Status)) {
502 device_printf(dev, "can't install GPE handler for %s - %s\n",
503 acpi_name(sc->ec_handle), AcpiFormatException(Status));
508 * Install address space handler
510 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "attaching address space handler\n"));
511 Status = AcpiInstallAddressSpaceHandler(sc->ec_handle, ACPI_ADR_SPACE_EC,
512 &EcSpaceHandler, &EcSpaceSetup, sc);
513 if (ACPI_FAILURE(Status)) {
514 device_printf(dev, "can't install address space handler for %s - %s\n",
515 acpi_name(sc->ec_handle), AcpiFormatException(Status));
519 /* Enable runtime GPEs for the handler. */
520 Status = AcpiSetGpeType(sc->ec_gpehandle, sc->ec_gpebit,
521 ACPI_GPE_TYPE_RUNTIME);
522 if (ACPI_FAILURE(Status)) {
523 device_printf(dev, "AcpiSetGpeType failed: %s\n",
524 AcpiFormatException(Status));
527 Status = AcpiEnableGpe(sc->ec_gpehandle, sc->ec_gpebit, ACPI_NOT_ISR);
528 if (ACPI_FAILURE(Status)) {
529 device_printf(dev, "AcpiEnableGpe failed: %s\n",
530 AcpiFormatException(Status));
534 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "acpi_ec_attach complete\n"));
538 AcpiRemoveGpeHandler(sc->ec_gpehandle, sc->ec_gpebit, &EcGpeHandler);
539 AcpiRemoveAddressSpaceHandler(sc->ec_handle, ACPI_ADR_SPACE_EC,
542 bus_release_resource(sc->ec_dev, SYS_RES_IOPORT, sc->ec_csr_rid,
545 bus_release_resource(sc->ec_dev, SYS_RES_IOPORT, sc->ec_data_rid,
551 acpi_ec_suspend(device_t dev)
553 struct acpi_ec_softc *sc;
555 sc = device_get_softc(dev);
556 sc->ec_suspending = TRUE;
561 acpi_ec_resume(device_t dev)
563 struct acpi_ec_softc *sc;
565 sc = device_get_softc(dev);
566 sc->ec_suspending = FALSE;
571 acpi_ec_shutdown(device_t dev)
573 struct acpi_ec_softc *sc;
575 /* Disable the GPE so we don't get EC events during shutdown. */
576 sc = device_get_softc(dev);
577 AcpiDisableGpe(sc->ec_gpehandle, sc->ec_gpebit, ACPI_NOT_ISR);
581 /* Methods to allow other devices (e.g., smbat) to read/write EC space. */
583 acpi_ec_read_method(device_t dev, u_int addr, ACPI_INTEGER *val, int width)
585 struct acpi_ec_softc *sc;
588 sc = device_get_softc(dev);
589 status = EcSpaceHandler(ACPI_READ, addr, width * 8, val, sc, NULL);
590 if (ACPI_FAILURE(status))
596 acpi_ec_write_method(device_t dev, u_int addr, ACPI_INTEGER val, int width)
598 struct acpi_ec_softc *sc;
601 sc = device_get_softc(dev);
602 status = EcSpaceHandler(ACPI_WRITE, addr, width * 8, &val, sc, NULL);
603 if (ACPI_FAILURE(status))
609 EcGpeQueryHandler(void *Context)
611 struct acpi_ec_softc *sc = (struct acpi_ec_softc *)Context;
616 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
617 KASSERT(Context != NULL, ("EcGpeQueryHandler called with NULL"));
619 /* Serialize user access with EcSpaceHandler(). */
621 if (ACPI_FAILURE(Status)) {
622 device_printf(sc->ec_dev, "GpeQuery lock error: %s\n",
623 AcpiFormatException(Status));
628 * Send a query command to the EC to find out which _Qxx call it
629 * wants to make. This command clears the SCI bit and also the
630 * interrupt source since we are edge-triggered. To prevent the GPE
631 * that may arise from running the query from causing another query
632 * to be queued, we clear the pending flag only after running it.
634 Status = EcCommand(sc, EC_COMMAND_QUERY);
635 sc->ec_sci_pend = FALSE;
636 if (ACPI_FAILURE(Status)) {
638 device_printf(sc->ec_dev, "GPE query failed: %s\n",
639 AcpiFormatException(Status));
642 Data = EC_GET_DATA(sc);
645 * We have to unlock before running the _Qxx method below since that
646 * method may attempt to read/write from EC address space, causing
647 * recursive acquisition of the lock.
651 /* Ignore the value for "no outstanding event". (13.3.5) */
653 CTR2(KTR_ACPI, "ec query ok,%s running _Q%02X", Data ? "" : " not", Data);
658 /* Evaluate _Qxx to respond to the controller. */
659 ksnprintf(qxx, sizeof(qxx), "_Q%02X", Data);
661 Status = AcpiEvaluateObject(sc->ec_handle, qxx, NULL, NULL);
662 if (ACPI_FAILURE(Status) && Status != AE_NOT_FOUND) {
663 device_printf(sc->ec_dev, "evaluation of query method %s failed: %s\n",
664 qxx, AcpiFormatException(Status));
669 * The GPE handler is called when IBE/OBF or SCI events occur. We are
670 * called from an unknown lock context.
673 EcGpeHandler(void *Context)
675 struct acpi_ec_softc *sc = Context;
679 KASSERT(Context != NULL, ("EcGpeHandler called with NULL"));
681 CTR0(KTR_ACPI, "ec gpe handler start");
684 * Notify EcWaitEvent() that the status register is now fresh. If we
685 * didn't do this, it wouldn't be possible to distinguish an old IBE
686 * from a new one, for example when doing a write transaction (writing
687 * address and then data values.)
689 atomic_add_int(&sc->ec_gencount, 1);
690 wakeup(&sc->ec_gencount);
693 * If the EC_SCI bit of the status register is set, queue a query handler.
694 * It will run the query and _Qxx method later, under the lock.
696 EcStatus = EC_GET_CSR(sc);
697 if ((EcStatus & EC_EVENT_SCI) && !sc->ec_sci_pend) {
699 CTR0(KTR_ACPI, "ec gpe queueing query handler");
701 Status = AcpiOsExecute(OSL_GPE_HANDLER, EcGpeQueryHandler, Context);
702 if (ACPI_SUCCESS(Status))
703 sc->ec_sci_pend = TRUE;
705 kprintf("EcGpeHandler: queuing GPE query handler failed\n");
711 EcSpaceSetup(ACPI_HANDLE Region, UINT32 Function, void *Context,
712 void **RegionContext)
715 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
718 * If deactivating a region, always set the output to NULL. Otherwise,
719 * just pass the context through.
721 if (Function == ACPI_REGION_DEACTIVATE)
722 *RegionContext = NULL;
724 *RegionContext = Context;
726 return_ACPI_STATUS (AE_OK);
730 EcSpaceHandler(UINT32 Function, ACPI_PHYSICAL_ADDRESS Address, UINT32 width,
731 ACPI_INTEGER *Value, void *Context, void *RegionContext)
733 struct acpi_ec_softc *sc = (struct acpi_ec_softc *)Context;
735 UINT8 EcAddr, EcData;
738 ACPI_FUNCTION_TRACE_U32((char *)(uintptr_t)__func__, (UINT32)Address);
740 if (width % 8 != 0 || Value == NULL || Context == NULL)
741 return_ACPI_STATUS (AE_BAD_PARAMETER);
742 if (Address + (width / 8) - 1 > 0xFF)
743 return_ACPI_STATUS (AE_BAD_ADDRESS);
745 if (Function == ACPI_READ)
751 * If booting, check if we need to run the query handler. If so, we
752 * we call it directly here since our thread taskq is not active yet.
754 if (cold || rebooting) {
755 if ((EC_GET_CSR(sc) & EC_EVENT_SCI)) {
757 CTR0(KTR_ACPI, "ec running gpe handler directly");
759 EcGpeQueryHandler(sc);
763 /* Serialize with EcGpeQueryHandler() at transaction granularity. */
765 if (ACPI_FAILURE(Status))
766 return_ACPI_STATUS (Status);
768 /* Perform the transaction(s), based on width. */
769 for (i = 0; i < width; i += 8, EcAddr++) {
772 Status = EcRead(sc, EcAddr, &EcData);
773 if (ACPI_SUCCESS(Status))
774 *Value |= ((ACPI_INTEGER)EcData) << i;
777 EcData = (UINT8)((*Value) >> i);
778 Status = EcWrite(sc, EcAddr, &EcData);
781 device_printf(sc->ec_dev, "invalid EcSpaceHandler function %d\n",
783 Status = AE_BAD_PARAMETER;
786 if (ACPI_FAILURE(Status))
791 return_ACPI_STATUS (Status);
795 EcCheckStatus(struct acpi_ec_softc *sc, const char *msg, EC_EVENT event)
800 status = AE_NO_HARDWARE_RESPONSE;
801 ec_status = EC_GET_CSR(sc);
802 if (sc->ec_burstactive && !(ec_status & EC_FLAG_BURST_MODE)) {
804 CTR1(KTR_ACPI, "ec burst disabled in waitevent (%s)", msg);
806 sc->ec_burstactive = FALSE;
808 if (EVENT_READY(event, ec_status)) {
810 CTR2(KTR_ACPI, "ec %s wait ready, status %#x", msg, ec_status);
818 EcWaitEvent(struct acpi_ec_softc *sc, EC_EVENT Event, u_int gen_count)
821 int count, i, slp_ival;
823 ACPI_SERIAL_ASSERT(ec);
824 Status = AE_NO_HARDWARE_RESPONSE;
825 int need_poll = cold || rebooting || ec_polled_mode || sc->ec_suspending;
827 * The main CPU should be much faster than the EC. So the status should
828 * be "not ready" when we start waiting. But if the main CPU is really
829 * slow, it's possible we see the current "ready" response. Since that
830 * can't be distinguished from the previous response in polled mode,
831 * this is a potential issue. We really should have interrupts enabled
832 * during boot so there is no ambiguity in polled mode.
834 * If this occurs, we add an additional delay before actually entering
835 * the status checking loop, hopefully to allow the EC to go to work
836 * and produce a non-stale status.
841 if (EcCheckStatus(sc, "pre-check", Event) == AE_OK) {
843 device_printf(sc->ec_dev,
844 "warning: EC done before starting event wait\n");
851 /* Wait for event by polling or GPE (interrupt). */
853 count = (ec_timeout * 1000) / EC_POLL_DELAY;
856 for (i = 0; i < count; i++) {
857 Status = EcCheckStatus(sc, "poll", Event);
860 AcpiOsStall(EC_POLL_DELAY);
863 slp_ival = hz / 1000;
867 /* hz has less than 1 ms resolution so scale timeout. */
869 count = ec_timeout / (1000 / hz);
873 * Wait for the GPE to signal the status changed, checking the
874 * status register each time we get one. It's possible to get a
875 * GPE for an event we're not interested in here (i.e., SCI for
878 for (i = 0; i < count; i++) {
879 if (gen_count != sc->ec_gencount) {
881 * Record new generation count. It's possible the GPE was
882 * just to notify us that a query is needed and we need to
883 * wait for a second GPE to signal the completion of the
884 * event we are actually waiting for.
886 gen_count = sc->ec_gencount;
887 Status = EcCheckStatus(sc, "sleep", Event);
891 tsleep(&sc->ec_gencount, PZERO, "ecgpe", slp_ival);
895 * We finished waiting for the GPE and it never arrived. Try to
896 * read the register once and trust whatever value we got. This is
897 * the best we can do at this point. Then, force polled mode on
898 * since this system doesn't appear to generate GPEs.
900 if (Status != AE_OK) {
901 Status = EcCheckStatus(sc, "sleep_end", Event);
902 device_printf(sc->ec_dev,
903 "wait timed out (%sresponse), forcing polled mode\n",
904 Status == AE_OK ? "" : "no ");
905 ec_polled_mode = TRUE;
910 CTR0(KTR_ACPI, "error: ec wait timed out");
916 EcCommand(struct acpi_ec_softc *sc, EC_COMMAND cmd)
923 ACPI_SERIAL_ASSERT(ec);
925 /* Don't use burst mode if user disabled it. */
926 if (!ec_burst_mode && cmd == EC_COMMAND_BURST_ENABLE)
929 /* Decide what to wait for based on command type. */
931 case EC_COMMAND_READ:
932 case EC_COMMAND_WRITE:
933 case EC_COMMAND_BURST_DISABLE:
934 event = EC_EVENT_INPUT_BUFFER_EMPTY;
936 case EC_COMMAND_QUERY:
937 case EC_COMMAND_BURST_ENABLE:
938 event = EC_EVENT_OUTPUT_BUFFER_FULL;
941 device_printf(sc->ec_dev, "EcCommand: invalid command %#x\n", cmd);
942 return (AE_BAD_PARAMETER);
945 /* Run the command and wait for the chosen event. */
947 CTR1(KTR_ACPI, "ec running command %#x", cmd);
949 gen_count = sc->ec_gencount;
951 status = EcWaitEvent(sc, event, gen_count);
952 if (ACPI_SUCCESS(status)) {
953 /* If we succeeded, burst flag should now be present. */
954 if (cmd == EC_COMMAND_BURST_ENABLE) {
955 ec_status = EC_GET_CSR(sc);
956 if ((ec_status & EC_FLAG_BURST_MODE) == 0)
960 device_printf(sc->ec_dev, "EcCommand: no response to %#x\n", cmd);
965 EcRead(struct acpi_ec_softc *sc, UINT8 Address, UINT8 *Data)
971 ACPI_SERIAL_ASSERT(ec);
973 CTR1(KTR_ACPI, "ec read from %#x", Address);
975 /* If we can't start burst mode, continue anyway. */
976 status = EcCommand(sc, EC_COMMAND_BURST_ENABLE);
977 if (status == AE_OK) {
978 data = EC_GET_DATA(sc);
979 if (data == EC_BURST_ACK) {
981 CTR0(KTR_ACPI, "ec burst enabled");
983 sc->ec_burstactive = TRUE;
987 status = EcCommand(sc, EC_COMMAND_READ);
988 if (ACPI_FAILURE(status))
991 gen_count = sc->ec_gencount;
992 EC_SET_DATA(sc, Address);
993 status = EcWaitEvent(sc, EC_EVENT_OUTPUT_BUFFER_FULL, gen_count);
994 if (ACPI_FAILURE(status)) {
995 device_printf(sc->ec_dev, "EcRead: failed waiting to get data\n");
998 *Data = EC_GET_DATA(sc);
1000 if (sc->ec_burstactive) {
1001 sc->ec_burstactive = FALSE;
1002 status = EcCommand(sc, EC_COMMAND_BURST_DISABLE);
1003 if (ACPI_FAILURE(status))
1006 CTR0(KTR_ACPI, "ec disabled burst ok");
1014 EcWrite(struct acpi_ec_softc *sc, UINT8 Address, UINT8 *Data)
1020 ACPI_SERIAL_ASSERT(ec);
1022 CTR2(KTR_ACPI, "ec write to %#x, data %#x", Address, *Data);
1025 /* If we can't start burst mode, continue anyway. */
1026 status = EcCommand(sc, EC_COMMAND_BURST_ENABLE);
1027 if (status == AE_OK) {
1028 data = EC_GET_DATA(sc);
1029 if (data == EC_BURST_ACK) {
1031 CTR0(KTR_ACPI, "ec burst enabled");
1033 sc->ec_burstactive = TRUE;
1037 status = EcCommand(sc, EC_COMMAND_WRITE);
1038 if (ACPI_FAILURE(status))
1041 gen_count = sc->ec_gencount;
1042 EC_SET_DATA(sc, Address);
1043 status = EcWaitEvent(sc, EC_EVENT_INPUT_BUFFER_EMPTY, gen_count);
1044 if (ACPI_FAILURE(status)) {
1045 device_printf(sc->ec_dev, "EcRead: failed waiting for sent address\n");
1049 gen_count = sc->ec_gencount;
1050 EC_SET_DATA(sc, *Data);
1051 status = EcWaitEvent(sc, EC_EVENT_INPUT_BUFFER_EMPTY, gen_count);
1052 if (ACPI_FAILURE(status)) {
1053 device_printf(sc->ec_dev, "EcWrite: failed waiting for sent data\n");
1057 if (sc->ec_burstactive) {
1058 sc->ec_burstactive = FALSE;
1059 status = EcCommand(sc, EC_COMMAND_BURST_DISABLE);
1060 if (ACPI_FAILURE(status))
1063 CTR0(KTR_ACPI, "ec disabled burst ok");