2 * Copyright (c) 2003 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 1.42 2004/01/03 02:01:39 njl Exp $
29 * $DragonFly: src/sys/dev/acpica5/acpi_ec.c,v 1.2 2004/03/01 06:33:13 dillon Exp $
31 /******************************************************************************
35 * Some or all of this work - Copyright (c) 1999, Intel Corp. All rights
40 * 2.1. This is your license from Intel Corp. under its intellectual property
41 * rights. You may have additional license terms from the party that provided
42 * you this software, covering your right to use that party's intellectual
45 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
46 * copy of the source code appearing in this file ("Covered Code") an
47 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
48 * base code distributed originally by Intel ("Original Intel Code") to copy,
49 * make derivatives, distribute, use and display any portion of the Covered
50 * Code in any form, with the right to sublicense such rights; and
52 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
53 * license (with the right to sublicense), under only those claims of Intel
54 * patents that are infringed by the Original Intel Code, to make, use, sell,
55 * offer to sell, and import the Covered Code and derivative works thereof
56 * solely to the minimum extent necessary to exercise the above copyright
57 * license, and in no event shall the patent license extend to any additions
58 * to or modifications of the Original Intel Code. No other license or right
59 * is granted directly or by implication, estoppel or otherwise;
61 * The above copyright and patent license is granted only if the following
66 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
67 * Redistribution of source code of any substantial portion of the Covered
68 * Code or modification with rights to further distribute source must include
69 * the above Copyright Notice, the above License, this list of Conditions,
70 * and the following Disclaimer and Export Compliance provision. In addition,
71 * Licensee must cause all Covered Code to which Licensee contributes to
72 * contain a file documenting the changes Licensee made to create that Covered
73 * Code and the date of any change. Licensee must include in that file the
74 * documentation of any changes made by any predecessor Licensee. Licensee
75 * must include a prominent statement that the modification is derived,
76 * directly or indirectly, from Original Intel Code.
78 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
79 * Redistribution of source code of any substantial portion of the Covered
80 * Code or modification without rights to further distribute source must
81 * include the following Disclaimer and Export Compliance provision in the
82 * documentation and/or other materials provided with distribution. In
83 * addition, Licensee may not authorize further sublicense of source of any
84 * portion of the Covered Code, and must include terms to the effect that the
85 * license from Licensee to its licensee is limited to the intellectual
86 * property embodied in the software Licensee provides to its licensee, and
87 * not to intellectual property embodied in modifications its licensee may
90 * 3.3. Redistribution of Executable. Redistribution in executable form of any
91 * substantial portion of the Covered Code or modification must reproduce the
92 * above Copyright Notice, and the following Disclaimer and Export Compliance
93 * provision in the documentation and/or other materials provided with the
96 * 3.4. Intel retains all right, title, and interest in and to the Original
99 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
100 * Intel shall be used in advertising or otherwise to promote the sale, use or
101 * other dealings in products derived from or relating to the Covered Code
102 * without prior written authorization from Intel.
104 * 4. Disclaimer and Export Compliance
106 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
107 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
108 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
109 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
110 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
111 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
112 * PARTICULAR PURPOSE.
114 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
115 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
116 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
117 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
118 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
119 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
120 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
123 * 4.3. Licensee shall not export, either directly or indirectly, any of this
124 * software or system incorporating such software without first obtaining any
125 * required license or other approval from the U. S. Department of Commerce or
126 * any other agency or department of the United States Government. In the
127 * event Licensee exports any such software from the United States or
128 * re-exports any such software from a foreign destination, Licensee shall
129 * ensure that the distribution and export/re-export of the software is in
130 * compliance with all laws, regulations, orders, or other restrictions of the
131 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
132 * any of its subsidiaries will export/re-export any technical data, process,
133 * software, or service, directly or indirectly, to any country for which the
134 * United States government or any agency thereof requires an export license,
135 * other governmental approval, or letter of assurance, without first obtaining
136 * such license, approval or letter.
138 *****************************************************************************/
140 * $FreeBSD: src/sys/dev/acpica/acpi_ec.c,v 1.42 2004/01/03 02:01:39 njl Exp $
141 * $DragonFly: src/sys/dev/acpica5/acpi_ec.c,v 1.2 2004/03/01 06:33:13 dillon Exp $
145 #include "opt_acpi.h"
146 #include <sys/param.h>
147 #include <sys/kernel.h>
149 #include <sys/thread.h>
151 #include <machine/bus.h>
152 #include <machine/resource.h>
153 #include <sys/rman.h>
157 #include <dev/acpica5/acpivar.h>
160 * Hooks for the ACPI CA debugging infrastructure
162 #define _COMPONENT ACPI_EC
163 ACPI_MODULE_NAME("EC")
169 typedef UINT8 EC_COMMAND;
171 #define EC_COMMAND_UNKNOWN ((EC_COMMAND) 0x00)
172 #define EC_COMMAND_READ ((EC_COMMAND) 0x80)
173 #define EC_COMMAND_WRITE ((EC_COMMAND) 0x81)
174 #define EC_COMMAND_BURST_ENABLE ((EC_COMMAND) 0x82)
175 #define EC_COMMAND_BURST_DISABLE ((EC_COMMAND) 0x83)
176 #define EC_COMMAND_QUERY ((EC_COMMAND) 0x84)
181 * The encoding of the EC status register is illustrated below.
182 * Note that a set bit (1) indicates the property is TRUE
183 * (e.g. if bit 0 is set then the output buffer is full).
188 * | | | | | | | +- Output Buffer Full?
189 * | | | | | | +--- Input Buffer Full?
190 * | | | | | +----- <reserved>
191 * | | | | +------- Data Register is Command Byte?
192 * | | | +--------- Burst Mode Enabled?
193 * | | +----------- SCI Event?
194 * | +------------- SMI Event?
195 * +--------------- <Reserved>
198 typedef UINT8 EC_STATUS;
200 #define EC_FLAG_OUTPUT_BUFFER ((EC_STATUS) 0x01)
201 #define EC_FLAG_INPUT_BUFFER ((EC_STATUS) 0x02)
202 #define EC_FLAG_BURST_MODE ((EC_STATUS) 0x10)
203 #define EC_FLAG_SCI ((EC_STATUS) 0x20)
209 typedef UINT8 EC_EVENT;
211 #define EC_EVENT_UNKNOWN ((EC_EVENT) 0x00)
212 #define EC_EVENT_OUTPUT_BUFFER_FULL ((EC_EVENT) 0x01)
213 #define EC_EVENT_INPUT_BUFFER_EMPTY ((EC_EVENT) 0x02)
214 #define EC_EVENT_SCI ((EC_EVENT) 0x20)
217 * Register access primitives
219 #define EC_GET_DATA(sc) \
220 bus_space_read_1((sc)->ec_data_tag, (sc)->ec_data_handle, 0)
222 #define EC_SET_DATA(sc, v) \
223 bus_space_write_1((sc)->ec_data_tag, (sc)->ec_data_handle, 0, (v))
225 #define EC_GET_CSR(sc) \
226 bus_space_read_1((sc)->ec_csr_tag, (sc)->ec_csr_handle, 0)
228 #define EC_SET_CSR(sc, v) \
229 bus_space_write_1((sc)->ec_csr_tag, (sc)->ec_csr_handle, 0, (v))
231 /* Embedded Controller Boot Resources Table (ECDT) */
233 ACPI_TABLE_HEADER header;
234 ACPI_GENERIC_ADDRESS control;
235 ACPI_GENERIC_ADDRESS data;
241 /* Indicate that this device has already been probed via ECDT. */
242 #define DEV_ECDT(x) (acpi_get_private(x) == &acpi_ec_devclass)
244 /* Indicate that this device should use the global lock. */
245 #define DEV_GLK_FLAG 0x40000000
247 /* Get/set GPE bit value in the magic ivar. */
248 #define DEV_GET_GPEBIT(x) ((x) & 0xff)
249 #define DEV_SET_GPEBIT(x, y) ((x) = ((x) & ~0xff) | ((y) & 0xff))
254 struct acpi_ec_softc {
256 ACPI_HANDLE ec_handle;
261 struct resource *ec_data_res;
262 bus_space_tag_t ec_data_tag;
263 bus_space_handle_t ec_data_handle;
266 struct resource *ec_csr_res;
267 bus_space_tag_t ec_csr_tag;
268 bus_space_handle_t ec_csr_handle;
272 struct lwkt_rwlock ec_rwlock;
278 * I couldn't find it in the spec but other implementations also use a
279 * value of 1 ms for the time to acquire global lock.
281 #define EC_LOCK_TIMEOUT 1000
284 * Start with an interval of 1 us for status poll loop. This delay
285 * will be dynamically adjusted based on the actual time waited.
287 #define EC_POLL_DELAY 1
289 /* Total time in ms spent in the poll loop waiting for a response. */
290 #define EC_POLL_TIMEOUT 100
292 #define EVENT_READY(event, status) \
293 (((event) == EC_EVENT_OUTPUT_BUFFER_FULL && \
294 ((status) & EC_FLAG_OUTPUT_BUFFER) != 0) || \
295 ((event) == EC_EVENT_INPUT_BUFFER_EMPTY && \
296 ((status) & EC_FLAG_INPUT_BUFFER) == 0))
298 static int ec_poll_timeout = EC_POLL_TIMEOUT;
299 TUNABLE_INT("hw.acpi.ec.poll_timeout", &ec_poll_timeout);
301 static __inline ACPI_STATUS
302 EcLock(struct acpi_ec_softc *sc)
304 ACPI_STATUS status = AE_OK;
306 /* Always acquire this EC's mutex. */
307 lwkt_exlock(&sc->ec_rwlock, "acpi2");
309 /* If _GLK is non-zero, also acquire the global lock. */
311 status = AcpiAcquireGlobalLock(EC_LOCK_TIMEOUT, &sc->ec_glkhandle);
312 if (ACPI_FAILURE(status))
313 lwkt_exunlock(&sc->ec_rwlock);
320 EcUnlock(struct acpi_ec_softc *sc)
323 AcpiReleaseGlobalLock(sc->ec_glkhandle);
324 lwkt_exunlock(&sc->ec_rwlock);
327 static void EcGpeHandler(void *Context);
328 static ACPI_STATUS EcSpaceSetup(ACPI_HANDLE Region, UINT32 Function,
329 void *Context, void **return_Context);
330 static ACPI_STATUS EcSpaceHandler(UINT32 Function,
331 ACPI_PHYSICAL_ADDRESS Address,
332 UINT32 width, ACPI_INTEGER *Value,
333 void *Context, void *RegionContext);
334 static ACPI_STATUS EcWaitEvent(struct acpi_ec_softc *sc, EC_EVENT Event);
335 static ACPI_STATUS EcCommand(struct acpi_ec_softc *sc, EC_COMMAND cmd);
336 static ACPI_STATUS EcRead(struct acpi_ec_softc *sc, UINT8 Address,
338 static ACPI_STATUS EcWrite(struct acpi_ec_softc *sc, UINT8 Address,
340 static int acpi_ec_probe(device_t dev);
341 static int acpi_ec_attach(device_t dev);
343 static device_method_t acpi_ec_methods[] = {
344 /* Device interface */
345 DEVMETHOD(device_probe, acpi_ec_probe),
346 DEVMETHOD(device_attach, acpi_ec_attach),
351 static driver_t acpi_ec_driver = {
354 sizeof(struct acpi_ec_softc),
357 static devclass_t acpi_ec_devclass;
358 DRIVER_MODULE(acpi_ec, acpi, acpi_ec_driver, acpi_ec_devclass, 0, 0);
361 * Look for an ECDT and if we find one, set up default GPE and
362 * space handlers to catch attempts to access EC space before
363 * we have a real driver instance in place.
364 * TODO: if people report invalid ECDTs, add a tunable to disable them.
367 acpi_ec_ecdt_probe(device_t parent)
369 ACPI_TABLE_ECDT *ecdt;
375 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
377 /* Find and validate the ECDT. */
378 status = AcpiGetFirmwareTable("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
379 (ACPI_TABLE_HEADER **)&ecdt);
380 if (ACPI_FAILURE(status) ||
381 ecdt->control.RegisterBitWidth != 8 ||
382 ecdt->data.RegisterBitWidth != 8) {
386 /* Create the child device with the given unit number. */
387 child = BUS_ADD_CHILD(parent, 0, "acpi_ec", ecdt->uid);
389 printf("acpi_ec_ecdt_probe: can't add child\n");
393 /* Find and save the ACPI handle for this device. */
394 status = AcpiGetHandle(NULL, ecdt->ec_id, &h);
395 if (ACPI_FAILURE(status)) {
396 device_delete_child(parent, child);
397 printf("acpi_ec_ecdt_probe: can't get handle\n");
400 acpi_set_handle(child, h);
402 /* Set the data and CSR register addresses. */
403 bus_set_resource(child, SYS_RES_IOPORT, 0, ecdt->data.Address,
405 bus_set_resource(child, SYS_RES_IOPORT, 1, ecdt->control.Address,
409 * Store values for the probe/attach routines to use. Store the
410 * ECDT GPE bit and set the global lock flag (just to be safe).
411 * We'll determine whether we really want to use the global lock
412 * in a later call to attach.
414 acpi_set_private(child, &acpi_ec_devclass);
415 magic = DEV_GLK_FLAG;
416 DEV_SET_GPEBIT(magic, ecdt->gpe_bit);
417 acpi_set_magic(child, magic);
419 /* Finish the attach process. */
420 if (device_probe_and_attach(child) != 0)
421 device_delete_child(parent, child);
425 acpi_ec_probe(device_t dev)
431 int magic, uid, glk, gpebit, ret = ENXIO;
433 /* Check that this is a device and that EC is not disabled. */
434 if (acpi_get_type(dev) != ACPI_TYPE_DEVICE || acpi_disabled("ec"))
438 * If probed via ECDT, set description and continue. Otherwise,
439 * we can access the namespace and make sure this is not a
442 magic = acpi_get_magic(dev);
444 snprintf(desc, sizeof(desc), "Embedded Controller: ECDT, GPE %#x, GLK",
445 DEV_GET_GPEBIT(magic));
446 device_set_desc_copy(dev, desc);
448 } else if (acpi_MatchHid(dev, "PNP0C09")) {
449 h = acpi_get_handle(dev);
452 * Read the unit ID to check for duplicate attach and the
453 * global lock value to see if we should acquire it when
456 status = acpi_EvaluateInteger(h, "_UID", &uid);
457 if (ACPI_FAILURE(status))
459 status = acpi_EvaluateInteger(h, "_GLK", &glk);
460 if (ACPI_FAILURE(status))
464 * Evaluate the _GPE method to find the GPE bit used by the EC to
465 * signal status (SCI). Note that we don't handle the case where
466 * it can return a package instead of an int.
468 status = acpi_EvaluateInteger(h, "_GPE", &gpebit);
469 if (ACPI_FAILURE(status)) {
470 device_printf(dev, "can't evaluate _GPE - %s\n",
471 AcpiFormatException(status));
475 /* Store the values we got from the namespace for attach. */
476 magic = glk != 0 ? DEV_GLK_FLAG : 0;
477 DEV_SET_GPEBIT(magic, gpebit);
478 acpi_set_magic(dev, magic);
481 * Check for a duplicate probe. This can happen when a probe
482 * via ECDT succeeded already. If there is a duplicate, override
483 * its value for GLK in the peer's softc since the ECDT case
484 * always enables the global lock to be safe. Otherwise, just
485 * continue on to attach.
487 peer = devclass_get_device(acpi_ec_devclass, uid);
488 if (peer == NULL || !device_is_alive(peer)) {
489 snprintf(desc, sizeof(desc), "Embedded Controller: GPE %#x%s",
490 gpebit, glk != 0 ? ", GLK" : "");
491 device_set_desc_copy(dev, desc);
494 struct acpi_ec_softc *sc;
497 * Set the peer's sc->ec_glk with locks held so we won't
498 * override it between another thread's lock/unlock calls.
500 sc = device_get_softc(peer);
501 if (sc->ec_glk != glk) {
502 ACPI_VPRINT(peer, acpi_device_get_parent_softc(peer),
503 "Changing GLK from %d to %d\n", sc->ec_glk, glk);
504 lwkt_exlock(&sc->ec_rwlock, "acpi2");
505 sc->ec_glk = glk != 0 ? 1 : 0;
506 lwkt_exunlock(&sc->ec_rwlock);
515 acpi_ec_attach(device_t dev)
517 struct acpi_ec_softc *sc;
519 int magic, errval = 0;
521 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
523 /* Fetch/initialize softc (assumes softc is pre-zeroed). */
524 sc = device_get_softc(dev);
526 sc->ec_handle = acpi_get_handle(dev);
527 sc->ec_polldelay = EC_POLL_DELAY;
528 lwkt_rwlock_init(&sc->ec_rwlock);
530 /* Retrieve previously probed values via device ivars. */
531 magic = acpi_get_magic(dev);
532 sc->ec_glk = (magic & DEV_GLK_FLAG) != 0 ? 1 : 0;
533 sc->ec_gpebit = DEV_GET_GPEBIT(magic);
535 /* Attach bus resources for data and command/status ports. */
537 sc->ec_data_res = bus_alloc_resource(sc->ec_dev, SYS_RES_IOPORT,
538 &sc->ec_data_rid, 0, ~0, 1, RF_ACTIVE);
539 if (sc->ec_data_res == NULL) {
540 device_printf(dev, "can't allocate data port\n");
544 sc->ec_data_tag = rman_get_bustag(sc->ec_data_res);
545 sc->ec_data_handle = rman_get_bushandle(sc->ec_data_res);
548 sc->ec_csr_res = bus_alloc_resource(sc->ec_dev, SYS_RES_IOPORT,
549 &sc->ec_csr_rid, 0, ~0, 1, RF_ACTIVE);
550 if (sc->ec_csr_res == NULL) {
551 device_printf(dev, "can't allocate command/status port\n");
555 sc->ec_csr_tag = rman_get_bustag(sc->ec_csr_res);
556 sc->ec_csr_handle = rman_get_bushandle(sc->ec_csr_res);
559 * Install a handler for this EC's GPE bit. We want edge-triggered
562 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "attaching GPE handler\n"));
563 Status = AcpiInstallGpeHandler(NULL, sc->ec_gpebit,
564 ACPI_EVENT_EDGE_TRIGGERED, &EcGpeHandler, sc);
565 if (ACPI_FAILURE(Status)) {
566 device_printf(dev, "can't install GPE handler for %s - %s\n",
567 acpi_name(sc->ec_handle), AcpiFormatException(Status));
573 * Install address space handler
575 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "attaching address space handler\n"));
576 Status = AcpiInstallAddressSpaceHandler(sc->ec_handle, ACPI_ADR_SPACE_EC,
577 &EcSpaceHandler, &EcSpaceSetup, sc);
578 if (ACPI_FAILURE(Status)) {
579 device_printf(dev, "can't install address space handler for %s - %s\n",
580 acpi_name(sc->ec_handle), AcpiFormatException(Status));
581 Status = AcpiRemoveGpeHandler(NULL, sc->ec_gpebit, &EcGpeHandler);
582 if (ACPI_FAILURE(Status))
583 panic("Added GPE handler but can't remove it");
588 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "acpi_ec_attach complete\n"));
593 bus_release_resource(sc->ec_dev, SYS_RES_IOPORT, sc->ec_csr_rid,
596 bus_release_resource(sc->ec_dev, SYS_RES_IOPORT, sc->ec_data_rid,
598 /* mtx_destroy(&sc->ec_mtx); */
603 EcGpeQueryHandler(void *Context)
605 struct acpi_ec_softc *sc = (struct acpi_ec_softc *)Context;
611 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
612 KASSERT(Context != NULL, ("EcGpeQueryHandler called with NULL"));
615 if (ACPI_FAILURE(Status)) {
616 ACPI_VPRINT(sc->ec_dev, acpi_device_get_parent_softc(sc->ec_dev),
617 "GpeQuery lock error: %s\n", AcpiFormatException(Status));
622 * If the EC_SCI bit of the status register is not set, then pass
623 * it along to any potential waiters as it may be an IBE/OBF event.
625 EcStatus = EC_GET_CSR(sc);
626 if ((EcStatus & EC_EVENT_SCI) == 0) {
627 sc->ec_csrvalue = EcStatus;
628 wakeup(&sc->ec_csrvalue);
634 * Send a query command to the EC to find out which _Qxx call it
635 * wants to make. This command clears the SCI bit and also the
636 * interrupt source since we are edge-triggered.
638 Status = EcCommand(sc, EC_COMMAND_QUERY);
639 if (ACPI_FAILURE(Status)) {
641 ACPI_VPRINT(sc->ec_dev, acpi_device_get_parent_softc(sc->ec_dev),
642 "GPE query failed - %s\n", AcpiFormatException(Status));
645 Data = EC_GET_DATA(sc);
648 /* Ignore the value for "no outstanding event". (13.3.5) */
652 /* Evaluate _Qxx to respond to the controller. */
653 sprintf(qxx, "_Q%02x", Data);
655 Status = AcpiEvaluateObject(sc->ec_handle, qxx, NULL, NULL);
656 if (ACPI_FAILURE(Status) && Status != AE_NOT_FOUND) {
657 ACPI_VPRINT(sc->ec_dev, acpi_device_get_parent_softc(sc->ec_dev),
658 "evaluation of GPE query method %s failed - %s\n",
659 qxx, AcpiFormatException(Status));
663 /* Re-enable the GPE event so we'll get future requests. */
664 Status = AcpiEnableGpe(NULL, sc->ec_gpebit, ACPI_NOT_ISR);
665 if (ACPI_FAILURE(Status))
666 printf("EcGpeQueryHandler: AcpiEnableEvent failed\n");
670 * Handle a GPE. Currently we only handle SCI events as others must
671 * be handled by polling in EcWaitEvent(). This is because some ECs
672 * treat events as level when they should be edge-triggered.
675 EcGpeHandler(void *Context)
677 struct acpi_ec_softc *sc = Context;
680 KASSERT(Context != NULL, ("EcGpeHandler called with NULL"));
682 /* Disable further GPEs while we handle this one. */
683 AcpiDisableGpe(NULL, sc->ec_gpebit, ACPI_ISR);
685 /* Schedule the GPE query handler. */
686 Status = AcpiOsQueueForExecution(OSD_PRIORITY_GPE, EcGpeQueryHandler,
688 if (ACPI_FAILURE(Status)) {
689 printf("Queuing GPE query handler failed.\n");
690 Status = AcpiEnableGpe(NULL, sc->ec_gpebit, ACPI_ISR);
691 if (ACPI_FAILURE(Status))
692 printf("EcGpeHandler: AcpiEnableEvent failed\n");
697 EcSpaceSetup(ACPI_HANDLE Region, UINT32 Function, void *Context,
698 void **RegionContext)
701 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
704 * If deactivating a region, always set the output to NULL. Otherwise,
705 * just pass the context through.
707 if (Function == ACPI_REGION_DEACTIVATE)
708 *RegionContext = NULL;
710 *RegionContext = Context;
712 return_ACPI_STATUS (AE_OK);
716 EcSpaceHandler(UINT32 Function, ACPI_PHYSICAL_ADDRESS Address, UINT32 width,
717 ACPI_INTEGER *Value, void *Context, void *RegionContext)
719 struct acpi_ec_softc *sc = (struct acpi_ec_softc *)Context;
720 ACPI_STATUS Status = AE_OK;
721 UINT8 EcAddr, EcData;
724 ACPI_FUNCTION_TRACE_U32((char *)(uintptr_t)__func__, (UINT32)Address);
726 if (Address > 0xFF || width % 8 != 0 || Value == NULL || Context == NULL)
727 return_ACPI_STATUS (AE_BAD_PARAMETER);
730 * Perform the transaction.
733 for (i = 0; i < width; i += 8) {
735 if (ACPI_FAILURE(Status))
741 Status = EcRead(sc, EcAddr, &EcData);
744 EcData = (UINT8)((*Value) >> i);
745 Status = EcWrite(sc, EcAddr, &EcData);
748 device_printf(sc->ec_dev, "invalid EcSpaceHandler function %d\n",
750 Status = AE_BAD_PARAMETER;
755 if (ACPI_FAILURE(Status))
758 *Value |= (ACPI_INTEGER)EcData << i;
760 return_ACPI_STATUS (AE_BAD_PARAMETER);
762 return_ACPI_STATUS (Status);
766 EcWaitEvent(struct acpi_ec_softc *sc, EC_EVENT Event)
770 int i, period, retval;
771 static int EcDbgMaxDelay;
773 /* mtx_assert(&sc->ec_mtx, MA_OWNED); */
774 Status = AE_NO_HARDWARE_RESPONSE;
777 * Wait for 1 us before checking the CSR. Testing shows about
778 * 50% of requests complete in 1 us and 90% of them complete
784 * Poll the EC status register to detect completion of the last
785 * command. First, wait up to 1 ms in chunks of sc->ec_polldelay
788 for (i = 0; i < 1000 / sc->ec_polldelay; i++) {
789 EcStatus = EC_GET_CSR(sc);
790 if (EVENT_READY(Event, EcStatus)) {
794 AcpiOsStall(sc->ec_polldelay);
797 /* Scale poll delay by the amount of time actually waited. */
798 period = i * sc->ec_polldelay;
800 sc->ec_polldelay = 1;
801 else if (period <= 20)
802 sc->ec_polldelay = 5;
803 else if (period <= 100)
804 sc->ec_polldelay = 10;
806 sc->ec_polldelay = 100;
809 * If we still don't have a response, wait up to ec_poll_timeout ms
810 * for completion, sleeping for chunks of ~10 ms.
812 if (Status != AE_OK) {
814 for (i = 0; i < ec_poll_timeout / 10; i++) {
816 EcStatus = EC_GET_CSR(sc);
818 EcStatus = sc->ec_csrvalue;
819 if (EVENT_READY(Event, EcStatus)) {
823 retval = tsleep(&sc->ec_csrvalue, 0, "ecpoll", 1 + hz / 100);
827 /* Calculate new delay and print it if it exceeds the max. */
830 if (period > EcDbgMaxDelay) {
831 EcDbgMaxDelay = period;
832 ACPI_VPRINT(sc->ec_dev, acpi_device_get_parent_softc(sc->ec_dev),
833 "info: new max delay is %d us\n", period);
840 EcCommand(struct acpi_ec_softc *sc, EC_COMMAND cmd)
845 /*mtx_assert(&sc->ec_mtx, MA_OWNED);*/
847 /* Decide what to wait for based on command type. */
849 case EC_COMMAND_READ:
850 case EC_COMMAND_WRITE:
851 case EC_COMMAND_BURST_DISABLE:
852 Event = EC_EVENT_INPUT_BUFFER_EMPTY;
854 case EC_COMMAND_QUERY:
855 case EC_COMMAND_BURST_ENABLE:
856 Event = EC_EVENT_OUTPUT_BUFFER_FULL;
859 ACPI_VPRINT(sc->ec_dev, acpi_device_get_parent_softc(sc->ec_dev),
860 "EcCommand: Invalid command %#x\n", cmd);
861 return (AE_BAD_PARAMETER);
864 /* Run the command and wait for the chosen event. */
866 Status = EcWaitEvent(sc, Event);
867 if (ACPI_FAILURE(Status)) {
868 ACPI_VPRINT(sc->ec_dev, acpi_device_get_parent_softc(sc->ec_dev),
869 "EcCommand: no response to %#x\n", cmd);
876 EcRead(struct acpi_ec_softc *sc, UINT8 Address, UINT8 *Data)
880 /*mtx_assert(&sc->ec_mtx, MA_OWNED);*/
883 /* If we can't start burst mode, continue anyway. */
884 EcCommand(sc, EC_COMMAND_BURST_ENABLE);
887 Status = EcCommand(sc, EC_COMMAND_READ);
888 if (ACPI_FAILURE(Status))
891 EC_SET_DATA(sc, Address);
892 Status = EcWaitEvent(sc, EC_EVENT_OUTPUT_BUFFER_FULL);
893 if (ACPI_FAILURE(Status)) {
894 ACPI_VPRINT(sc->ec_dev, acpi_device_get_parent_softc(sc->ec_dev),
895 "EcRead: Failed waiting for EC to send data.\n");
899 *Data = EC_GET_DATA(sc);
902 if (sc->ec_burstactive) {
903 Status = EcCommand(sc, EC_COMMAND_BURST_DISABLE);
904 if (ACPI_FAILURE(Status))
913 EcWrite(struct acpi_ec_softc *sc, UINT8 Address, UINT8 *Data)
917 /*mtx_assert(&sc->ec_mtx, MA_OWNED);*/
920 /* If we can't start burst mode, continue anyway. */
921 EcCommand(sc, EC_COMMAND_BURST_ENABLE);
924 Status = EcCommand(sc, EC_COMMAND_WRITE);
925 if (ACPI_FAILURE(Status))
928 EC_SET_DATA(sc, Address);
929 Status = EcWaitEvent(sc, EC_EVENT_INPUT_BUFFER_EMPTY);
930 if (ACPI_FAILURE(Status)) {
931 ACPI_VPRINT(sc->ec_dev, acpi_device_get_parent_softc(sc->ec_dev),
932 "EcRead: Failed waiting for EC to process address\n");
936 EC_SET_DATA(sc, *Data);
937 Status = EcWaitEvent(sc, EC_EVENT_INPUT_BUFFER_EMPTY);
938 if (ACPI_FAILURE(Status)) {
939 ACPI_VPRINT(sc->ec_dev, acpi_device_get_parent_softc(sc->ec_dev),
940 "EcWrite: Failed waiting for EC to process data\n");
945 if (sc->ec_burstactive) {
946 Status = EcCommand(sc, EC_COMMAND_BURST_DISABLE);
947 if (ACPI_FAILURE(Status))