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
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
33 #include <sys/param.h>
34 #include <sys/kernel.h>
37 #include <sys/malloc.h>
38 #include <sys/module.h>
41 #include <machine/bus.h>
42 #include <machine/resource.h>
45 #include <contrib/dev/acpica/acpi.h>
46 #include <dev/acpica/acpivar.h>
48 /* Hooks for the ACPI CA debugging infrastructure */
49 #define _COMPONENT ACPI_EC
50 ACPI_MODULE_NAME("EC")
56 typedef UINT8 EC_COMMAND;
58 #define EC_COMMAND_UNKNOWN ((EC_COMMAND) 0x00)
59 #define EC_COMMAND_READ ((EC_COMMAND) 0x80)
60 #define EC_COMMAND_WRITE ((EC_COMMAND) 0x81)
61 #define EC_COMMAND_BURST_ENABLE ((EC_COMMAND) 0x82)
62 #define EC_COMMAND_BURST_DISABLE ((EC_COMMAND) 0x83)
63 #define EC_COMMAND_QUERY ((EC_COMMAND) 0x84)
68 * The encoding of the EC status register is illustrated below.
69 * Note that a set bit (1) indicates the property is TRUE
70 * (e.g. if bit 0 is set then the output buffer is full).
75 * | | | | | | | +- Output Buffer Full?
76 * | | | | | | +--- Input Buffer Full?
77 * | | | | | +----- <reserved>
78 * | | | | +------- Data Register is Command Byte?
79 * | | | +--------- Burst Mode Enabled?
80 * | | +----------- SCI Event?
81 * | +------------- SMI Event?
82 * +--------------- <reserved>
85 typedef UINT8 EC_STATUS;
87 #define EC_FLAG_OUTPUT_BUFFER ((EC_STATUS) 0x01)
88 #define EC_FLAG_INPUT_BUFFER ((EC_STATUS) 0x02)
89 #define EC_FLAG_DATA_IS_CMD ((EC_STATUS) 0x08)
90 #define EC_FLAG_BURST_MODE ((EC_STATUS) 0x10)
96 typedef UINT8 EC_EVENT;
98 #define EC_EVENT_UNKNOWN ((EC_EVENT) 0x00)
99 #define EC_EVENT_OUTPUT_BUFFER_FULL ((EC_EVENT) 0x01)
100 #define EC_EVENT_INPUT_BUFFER_EMPTY ((EC_EVENT) 0x02)
101 #define EC_EVENT_SCI ((EC_EVENT) 0x20)
102 #define EC_EVENT_SMI ((EC_EVENT) 0x40)
104 /* Data byte returned after burst enable indicating it was successful. */
105 #define EC_BURST_ACK 0x90
108 * Register access primitives
110 #define EC_GET_DATA(sc) \
111 bus_space_read_1((sc)->ec_data_tag, (sc)->ec_data_handle, 0)
113 #define EC_SET_DATA(sc, v) \
114 bus_space_write_1((sc)->ec_data_tag, (sc)->ec_data_handle, 0, (v))
116 #define EC_GET_CSR(sc) \
117 bus_space_read_1((sc)->ec_csr_tag, (sc)->ec_csr_handle, 0)
119 #define EC_SET_CSR(sc, v) \
120 bus_space_write_1((sc)->ec_csr_tag, (sc)->ec_csr_handle, 0, (v))
122 /* Additional params to pass from the probe routine */
123 struct acpi_ec_params {
126 ACPI_HANDLE gpe_handle;
130 /* Indicate that this device has already been probed via ECDT. */
131 #define DEV_ECDT(x) (acpi_get_magic(x) == (uintptr_t)&acpi_ec_devclass)
136 struct acpi_ec_softc {
138 ACPI_HANDLE ec_handle;
140 ACPI_HANDLE ec_gpehandle;
144 struct resource *ec_data_res;
145 bus_space_tag_t ec_data_tag;
146 bus_space_handle_t ec_data_handle;
149 struct resource *ec_csr_res;
150 bus_space_tag_t ec_csr_tag;
151 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 5
170 /* Total time in ms spent waiting for a response from EC. */
171 #define EC_TIMEOUT 750
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_shutdown(device_t dev);
238 static int acpi_ec_read_method(device_t dev, u_int addr,
239 ACPI_INTEGER *val, int width);
240 static int acpi_ec_write_method(device_t dev, u_int addr,
241 ACPI_INTEGER val, int width);
243 static device_method_t acpi_ec_methods[] = {
244 /* Device interface */
245 DEVMETHOD(device_probe, acpi_ec_probe),
246 DEVMETHOD(device_attach, acpi_ec_attach),
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, 0, 0);
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, 0, "acpi_ec", ecdt->Uid);
296 printf("%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 printf("%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 = malloc(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);
328 acpi_set_magic(child, (uintptr_t)&acpi_ec_devclass);
330 /* Finish the attach process. */
331 if (device_probe_and_attach(child) != 0)
332 device_delete_child(parent, child);
336 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;
362 params = acpi_get_private(dev);
364 } else if (!acpi_disabled("ec") &&
365 ACPI_ID_PROBE(device_get_parent(dev), dev, ec_ids)) {
366 params = malloc(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 snprintf(desc, sizeof(desc), "Embedded Controller: GPE %#x%s%s",
434 params->gpe_bit, (params->glk) ? ", GLK" : "",
435 DEV_ECDT(dev) ? ", ECDT" : "");
436 device_set_desc_copy(dev, desc);
439 if (ret > 0 && params)
440 free(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);
461 /* Retrieve previously probed values via device ivars. */
462 sc->ec_glk = params->glk;
463 sc->ec_gpebit = params->gpe_bit;
464 sc->ec_gpehandle = params->gpe_handle;
465 sc->ec_uid = params->uid;
466 free(params, M_TEMP);
468 /* Attach bus resources for data and command/status ports. */
470 sc->ec_data_res = bus_alloc_resource_any(sc->ec_dev, SYS_RES_IOPORT,
471 &sc->ec_data_rid, RF_ACTIVE);
472 if (sc->ec_data_res == NULL) {
473 device_printf(dev, "can't allocate data port\n");
476 sc->ec_data_tag = rman_get_bustag(sc->ec_data_res);
477 sc->ec_data_handle = rman_get_bushandle(sc->ec_data_res);
480 sc->ec_csr_res = bus_alloc_resource_any(sc->ec_dev, SYS_RES_IOPORT,
481 &sc->ec_csr_rid, RF_ACTIVE);
482 if (sc->ec_csr_res == NULL) {
483 device_printf(dev, "can't allocate command/status port\n");
486 sc->ec_csr_tag = rman_get_bustag(sc->ec_csr_res);
487 sc->ec_csr_handle = rman_get_bushandle(sc->ec_csr_res);
490 * Install a handler for this EC's GPE bit. We want edge-triggered
493 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "attaching GPE handler\n"));
494 Status = AcpiInstallGpeHandler(sc->ec_gpehandle, sc->ec_gpebit,
495 ACPI_GPE_EDGE_TRIGGERED, &EcGpeHandler, sc);
496 if (ACPI_FAILURE(Status)) {
497 device_printf(dev, "can't install GPE handler for %s - %s\n",
498 acpi_name(sc->ec_handle), AcpiFormatException(Status));
503 * Install address space handler
505 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "attaching address space handler\n"));
506 Status = AcpiInstallAddressSpaceHandler(sc->ec_handle, ACPI_ADR_SPACE_EC,
507 &EcSpaceHandler, &EcSpaceSetup, sc);
508 if (ACPI_FAILURE(Status)) {
509 device_printf(dev, "can't install address space handler for %s - %s\n",
510 acpi_name(sc->ec_handle), AcpiFormatException(Status));
514 /* Enable runtime GPEs for the handler. */
515 Status = AcpiSetGpeType(sc->ec_gpehandle, sc->ec_gpebit,
516 ACPI_GPE_TYPE_RUNTIME);
517 if (ACPI_FAILURE(Status)) {
518 device_printf(dev, "AcpiSetGpeType failed: %s\n",
519 AcpiFormatException(Status));
522 Status = AcpiEnableGpe(sc->ec_gpehandle, sc->ec_gpebit, ACPI_NOT_ISR);
523 if (ACPI_FAILURE(Status)) {
524 device_printf(dev, "AcpiEnableGpe failed: %s\n",
525 AcpiFormatException(Status));
529 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "acpi_ec_attach complete\n"));
533 AcpiRemoveGpeHandler(sc->ec_gpehandle, sc->ec_gpebit, &EcGpeHandler);
534 AcpiRemoveAddressSpaceHandler(sc->ec_handle, ACPI_ADR_SPACE_EC,
537 bus_release_resource(sc->ec_dev, SYS_RES_IOPORT, sc->ec_csr_rid,
540 bus_release_resource(sc->ec_dev, SYS_RES_IOPORT, sc->ec_data_rid,
546 acpi_ec_shutdown(device_t dev)
548 struct acpi_ec_softc *sc;
550 /* Disable the GPE so we don't get EC events during shutdown. */
551 sc = device_get_softc(dev);
552 AcpiDisableGpe(sc->ec_gpehandle, sc->ec_gpebit, ACPI_NOT_ISR);
556 /* Methods to allow other devices (e.g., smbat) to read/write EC space. */
558 acpi_ec_read_method(device_t dev, u_int addr, ACPI_INTEGER *val, int width)
560 struct acpi_ec_softc *sc;
563 sc = device_get_softc(dev);
564 status = EcSpaceHandler(ACPI_READ, addr, width * 8, val, sc, NULL);
565 if (ACPI_FAILURE(status))
571 acpi_ec_write_method(device_t dev, u_int addr, ACPI_INTEGER val, int width)
573 struct acpi_ec_softc *sc;
576 sc = device_get_softc(dev);
577 status = EcSpaceHandler(ACPI_WRITE, addr, width * 8, &val, sc, NULL);
578 if (ACPI_FAILURE(status))
584 EcGpeQueryHandler(void *Context)
586 struct acpi_ec_softc *sc = (struct acpi_ec_softc *)Context;
591 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
592 KASSERT(Context != NULL, ("EcGpeQueryHandler called with NULL"));
594 /* Serialize user access with EcSpaceHandler(). */
596 if (ACPI_FAILURE(Status)) {
597 device_printf(sc->ec_dev, "GpeQuery lock error: %s\n",
598 AcpiFormatException(Status));
603 * Send a query command to the EC to find out which _Qxx call it
604 * wants to make. This command clears the SCI bit and also the
605 * interrupt source since we are edge-triggered. To prevent the GPE
606 * that may arise from running the query from causing another query
607 * to be queued, we clear the pending flag only after running it.
609 Status = EcCommand(sc, EC_COMMAND_QUERY);
610 sc->ec_sci_pend = FALSE;
611 if (ACPI_FAILURE(Status)) {
613 device_printf(sc->ec_dev, "GPE query failed: %s\n",
614 AcpiFormatException(Status));
617 Data = EC_GET_DATA(sc);
620 * We have to unlock before running the _Qxx method below since that
621 * method may attempt to read/write from EC address space, causing
622 * recursive acquisition of the lock.
626 /* Ignore the value for "no outstanding event". (13.3.5) */
627 CTR2(KTR_ACPI, "ec query ok,%s running _Q%02X", Data ? "" : " not", Data);
631 /* Evaluate _Qxx to respond to the controller. */
632 snprintf(qxx, sizeof(qxx), "_Q%02X", Data);
634 Status = AcpiEvaluateObject(sc->ec_handle, qxx, NULL, NULL);
635 if (ACPI_FAILURE(Status) && Status != AE_NOT_FOUND) {
636 device_printf(sc->ec_dev, "evaluation of query method %s failed: %s\n",
637 qxx, AcpiFormatException(Status));
642 * The GPE handler is called when IBE/OBF or SCI events occur. We are
643 * called from an unknown lock context.
646 EcGpeHandler(void *Context)
648 struct acpi_ec_softc *sc = Context;
652 KASSERT(Context != NULL, ("EcGpeHandler called with NULL"));
653 CTR0(KTR_ACPI, "ec gpe handler start");
656 * Notify EcWaitEvent() that the status register is now fresh. If we
657 * didn't do this, it wouldn't be possible to distinguish an old IBE
658 * from a new one, for example when doing a write transaction (writing
659 * address and then data values.)
661 atomic_add_int(&sc->ec_gencount, 1);
662 wakeup(&sc->ec_gencount);
665 * If the EC_SCI bit of the status register is set, queue a query handler.
666 * It will run the query and _Qxx method later, under the lock.
668 EcStatus = EC_GET_CSR(sc);
669 if ((EcStatus & EC_EVENT_SCI) && !sc->ec_sci_pend) {
670 CTR0(KTR_ACPI, "ec gpe queueing query handler");
671 Status = AcpiOsExecute(OSL_GPE_HANDLER, EcGpeQueryHandler, Context);
672 if (ACPI_SUCCESS(Status))
673 sc->ec_sci_pend = TRUE;
675 printf("EcGpeHandler: queuing GPE query handler failed\n");
681 EcSpaceSetup(ACPI_HANDLE Region, UINT32 Function, void *Context,
682 void **RegionContext)
685 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
688 * If deactivating a region, always set the output to NULL. Otherwise,
689 * just pass the context through.
691 if (Function == ACPI_REGION_DEACTIVATE)
692 *RegionContext = NULL;
694 *RegionContext = Context;
696 return_ACPI_STATUS (AE_OK);
700 EcSpaceHandler(UINT32 Function, ACPI_PHYSICAL_ADDRESS Address, UINT32 width,
701 ACPI_INTEGER *Value, void *Context, void *RegionContext)
703 struct acpi_ec_softc *sc = (struct acpi_ec_softc *)Context;
705 UINT8 EcAddr, EcData;
708 ACPI_FUNCTION_TRACE_U32((char *)(uintptr_t)__func__, (UINT32)Address);
710 if (width % 8 != 0 || Value == NULL || Context == NULL)
711 return_ACPI_STATUS (AE_BAD_PARAMETER);
712 if (Address + (width / 8) - 1 > 0xFF)
713 return_ACPI_STATUS (AE_BAD_ADDRESS);
715 if (Function == ACPI_READ)
721 * If booting, check if we need to run the query handler. If so, we
722 * we call it directly here since our thread taskq is not active yet.
724 if (cold || rebooting) {
725 if ((EC_GET_CSR(sc) & EC_EVENT_SCI)) {
726 CTR0(KTR_ACPI, "ec running gpe handler directly");
727 EcGpeQueryHandler(sc);
731 /* Serialize with EcGpeQueryHandler() at transaction granularity. */
733 if (ACPI_FAILURE(Status))
734 return_ACPI_STATUS (Status);
736 /* Perform the transaction(s), based on width. */
737 for (i = 0; i < width; i += 8, EcAddr++) {
740 Status = EcRead(sc, EcAddr, &EcData);
741 if (ACPI_SUCCESS(Status))
742 *Value |= ((ACPI_INTEGER)EcData) << i;
745 EcData = (UINT8)((*Value) >> i);
746 Status = EcWrite(sc, EcAddr, &EcData);
749 device_printf(sc->ec_dev, "invalid EcSpaceHandler function %d\n",
751 Status = AE_BAD_PARAMETER;
754 if (ACPI_FAILURE(Status))
759 return_ACPI_STATUS (Status);
763 EcCheckStatus(struct acpi_ec_softc *sc, const char *msg, EC_EVENT event)
768 status = AE_NO_HARDWARE_RESPONSE;
769 ec_status = EC_GET_CSR(sc);
770 if (sc->ec_burstactive && !(ec_status & EC_FLAG_BURST_MODE)) {
771 CTR1(KTR_ACPI, "ec burst disabled in waitevent (%s)", msg);
772 sc->ec_burstactive = FALSE;
774 if (EVENT_READY(event, ec_status)) {
775 CTR2(KTR_ACPI, "ec %s wait ready, status %#x", msg, ec_status);
782 EcWaitEvent(struct acpi_ec_softc *sc, EC_EVENT Event, u_int gen_count)
785 int count, i, slp_ival;
787 ACPI_SERIAL_ASSERT(ec);
788 Status = AE_NO_HARDWARE_RESPONSE;
791 * The main CPU should be much faster than the EC. So the status should
792 * be "not ready" when we start waiting. But if the main CPU is really
793 * slow, it's possible we see the current "ready" response. Since that
794 * can't be distinguished from the previous response in polled mode,
795 * this is a potential issue. We really should have interrupts enabled
796 * during boot so there is no ambiguity in polled mode.
798 * If this occurs, we add an additional delay before actually entering
799 * the status checking loop, hopefully to allow the EC to go to work
800 * and produce a non-stale status.
802 if (cold || rebooting || ec_polled_mode) {
805 if (EcCheckStatus(sc, "pre-check", Event) == AE_OK) {
807 device_printf(sc->ec_dev,
808 "warning: EC done before starting event wait\n");
815 /* Wait for event by polling or GPE (interrupt). */
816 if (cold || rebooting || ec_polled_mode) {
817 count = (ec_timeout * 1000) / EC_POLL_DELAY;
820 for (i = 0; i < count; i++) {
821 Status = EcCheckStatus(sc, "poll", Event);
824 AcpiOsStall(EC_POLL_DELAY);
827 slp_ival = hz / 1000;
831 /* hz has less than 1 ms resolution so scale timeout. */
833 count = ec_timeout / (1000 / hz);
837 * Wait for the GPE to signal the status changed, checking the
838 * status register each time we get one. It's possible to get a
839 * GPE for an event we're not interested in here (i.e., SCI for
842 for (i = 0; i < count; i++) {
843 if (gen_count != sc->ec_gencount) {
845 * Record new generation count. It's possible the GPE was
846 * just to notify us that a query is needed and we need to
847 * wait for a second GPE to signal the completion of the
848 * event we are actually waiting for.
850 gen_count = sc->ec_gencount;
851 Status = EcCheckStatus(sc, "sleep", Event);
855 tsleep(&sc->ec_gencount, PZERO, "ecgpe", slp_ival);
859 * We finished waiting for the GPE and it never arrived. Try to
860 * read the register once and trust whatever value we got. This is
861 * the best we can do at this point. Then, force polled mode on
862 * since this system doesn't appear to generate GPEs.
864 if (Status != AE_OK) {
865 Status = EcCheckStatus(sc, "sleep_end", Event);
866 device_printf(sc->ec_dev,
867 "wait timed out (%sresponse), forcing polled mode\n",
868 Status == AE_OK ? "" : "no ");
869 ec_polled_mode = TRUE;
873 CTR0(KTR_ACPI, "error: ec wait timed out");
878 EcCommand(struct acpi_ec_softc *sc, EC_COMMAND cmd)
885 ACPI_SERIAL_ASSERT(ec);
887 /* Don't use burst mode if user disabled it. */
888 if (!ec_burst_mode && cmd == EC_COMMAND_BURST_ENABLE)
891 /* Decide what to wait for based on command type. */
893 case EC_COMMAND_READ:
894 case EC_COMMAND_WRITE:
895 case EC_COMMAND_BURST_DISABLE:
896 event = EC_EVENT_INPUT_BUFFER_EMPTY;
898 case EC_COMMAND_QUERY:
899 case EC_COMMAND_BURST_ENABLE:
900 event = EC_EVENT_OUTPUT_BUFFER_FULL;
903 device_printf(sc->ec_dev, "EcCommand: invalid command %#x\n", cmd);
904 return (AE_BAD_PARAMETER);
907 /* Run the command and wait for the chosen event. */
908 CTR1(KTR_ACPI, "ec running command %#x", cmd);
909 gen_count = sc->ec_gencount;
911 status = EcWaitEvent(sc, event, gen_count);
912 if (ACPI_SUCCESS(status)) {
913 /* If we succeeded, burst flag should now be present. */
914 if (cmd == EC_COMMAND_BURST_ENABLE) {
915 ec_status = EC_GET_CSR(sc);
916 if ((ec_status & EC_FLAG_BURST_MODE) == 0)
920 device_printf(sc->ec_dev, "EcCommand: no response to %#x\n", cmd);
925 EcRead(struct acpi_ec_softc *sc, UINT8 Address, UINT8 *Data)
931 ACPI_SERIAL_ASSERT(ec);
932 CTR1(KTR_ACPI, "ec read from %#x", Address);
934 /* If we can't start burst mode, continue anyway. */
935 status = EcCommand(sc, EC_COMMAND_BURST_ENABLE);
936 if (status == AE_OK) {
937 data = EC_GET_DATA(sc);
938 if (data == EC_BURST_ACK) {
939 CTR0(KTR_ACPI, "ec burst enabled");
940 sc->ec_burstactive = TRUE;
944 status = EcCommand(sc, EC_COMMAND_READ);
945 if (ACPI_FAILURE(status))
948 gen_count = sc->ec_gencount;
949 EC_SET_DATA(sc, Address);
950 status = EcWaitEvent(sc, EC_EVENT_OUTPUT_BUFFER_FULL, gen_count);
951 if (ACPI_FAILURE(status)) {
952 device_printf(sc->ec_dev, "EcRead: failed waiting to get data\n");
955 *Data = EC_GET_DATA(sc);
957 if (sc->ec_burstactive) {
958 sc->ec_burstactive = FALSE;
959 status = EcCommand(sc, EC_COMMAND_BURST_DISABLE);
960 if (ACPI_FAILURE(status))
962 CTR0(KTR_ACPI, "ec disabled burst ok");
969 EcWrite(struct acpi_ec_softc *sc, UINT8 Address, UINT8 *Data)
975 ACPI_SERIAL_ASSERT(ec);
976 CTR2(KTR_ACPI, "ec write to %#x, data %#x", Address, *Data);
978 /* If we can't start burst mode, continue anyway. */
979 status = EcCommand(sc, EC_COMMAND_BURST_ENABLE);
980 if (status == AE_OK) {
981 data = EC_GET_DATA(sc);
982 if (data == EC_BURST_ACK) {
983 CTR0(KTR_ACPI, "ec burst enabled");
984 sc->ec_burstactive = TRUE;
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, "EcRead: 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");
1008 if (sc->ec_burstactive) {
1009 sc->ec_burstactive = FALSE;
1010 status = EcCommand(sc, EC_COMMAND_BURST_DISABLE);
1011 if (ACPI_FAILURE(status))
1013 CTR0(KTR_ACPI, "ec disabled burst ok");