/* $NetBSD: acpi_ec.c,v 1.18 2003/11/03 18:07:10 mycroft Exp $ */ /* * Copyright 2001 Wasabi Systems, Inc. * All rights reserved. * * Written by Jason R. Thorpe for Wasabi Systems, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed for the NetBSD Project by * Wasabi Systems, Inc. * 4. The name of Wasabi Systems, Inc. may not be used to endorse * or promote products derived from this software without specific prior * written permission. * * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /*- * Copyright (c) 2000 Michael Smith * Copyright (c) 2000 BSDi * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /****************************************************************************** * * 1. Copyright Notice * * Some or all of this work - Copyright (c) 1999, Intel Corp. All rights * reserved. * * 2. License * * 2.1. This is your license from Intel Corp. under its intellectual property * rights. You may have additional license terms from the party that provided * you this software, covering your right to use that party's intellectual * property rights. * * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a * copy of the source code appearing in this file ("Covered Code") an * irrevocable, perpetual, worldwide license under Intel's copyrights in the * base code distributed originally by Intel ("Original Intel Code") to copy, * make derivatives, distribute, use and display any portion of the Covered * Code in any form, with the right to sublicense such rights; and * * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent * license (with the right to sublicense), under only those claims of Intel * patents that are infringed by the Original Intel Code, to make, use, sell, * offer to sell, and import the Covered Code and derivative works thereof * solely to the minimum extent necessary to exercise the above copyright * license, and in no event shall the patent license extend to any additions * to or modifications of the Original Intel Code. No other license or right * is granted directly or by implication, estoppel or otherwise; * * The above copyright and patent license is granted only if the following * conditions are met: * * 3. Conditions * * 3.1. Redistribution of Source with Rights to Further Distribute Source. * Redistribution of source code of any substantial portion of the Covered * Code or modification with rights to further distribute source must include * the above Copyright Notice, the above License, this list of Conditions, * and the following Disclaimer and Export Compliance provision. In addition, * Licensee must cause all Covered Code to which Licensee contributes to * contain a file documenting the changes Licensee made to create that Covered * Code and the date of any change. Licensee must include in that file the * documentation of any changes made by any predecessor Licensee. Licensee * must include a prominent statement that the modification is derived, * directly or indirectly, from Original Intel Code. * * 3.2. Redistribution of Source with no Rights to Further Distribute Source. * Redistribution of source code of any substantial portion of the Covered * Code or modification without rights to further distribute source must * include the following Disclaimer and Export Compliance provision in the * documentation and/or other materials provided with distribution. In * addition, Licensee may not authorize further sublicense of source of any * portion of the Covered Code, and must include terms to the effect that the * license from Licensee to its licensee is limited to the intellectual * property embodied in the software Licensee provides to its licensee, and * not to intellectual property embodied in modifications its licensee may * make. * * 3.3. Redistribution of Executable. Redistribution in executable form of any * substantial portion of the Covered Code or modification must reproduce the * above Copyright Notice, and the following Disclaimer and Export Compliance * provision in the documentation and/or other materials provided with the * distribution. * * 3.4. Intel retains all right, title, and interest in and to the Original * Intel Code. * * 3.5. Neither the name Intel nor any other trademark owned or controlled by * Intel shall be used in advertising or otherwise to promote the sale, use or * other dealings in products derived from or relating to the Covered Code * without prior written authorization from Intel. * * 4. Disclaimer and Export Compliance * * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A * PARTICULAR PURPOSE. * * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY * LIMITED REMEDY. * * 4.3. Licensee shall not export, either directly or indirectly, any of this * software or system incorporating such software without first obtaining any * required license or other approval from the U. S. Department of Commerce or * any other agency or department of the United States Government. In the * event Licensee exports any such software from the United States or * re-exports any such software from a foreign destination, Licensee shall * ensure that the distribution and export/re-export of the software is in * compliance with all laws, regulations, orders, or other restrictions of the * U.S. Export Administration Regulations. Licensee agrees that neither it nor * any of its subsidiaries will export/re-export any technical data, process, * software, or service, directly or indirectly, to any country for which the * United States government or any agency thereof requires an export license, * other governmental approval, or letter of assurance, without first obtaining * such license, approval or letter. * *****************************************************************************/ #include __KERNEL_RCSID(0, "$NetBSD: acpi_ec.c,v 1.18 2003/11/03 18:07:10 mycroft Exp $"); #include #include #include #include #include #include #include #include #include #include #define _COMPONENT ACPI_EC_COMPONENT ACPI_MODULE_NAME("EC") struct acpi_ec_softc { struct device sc_dev; /* base device glue */ struct acpi_devnode *sc_node; /* our ACPI devnode */ struct acpi_resources sc_res; /* our bus resources */ UINT32 sc_gpebit; /* our GPE interrupt bit */ bus_space_tag_t sc_data_st; /* space tag for data register */ bus_space_handle_t sc_data_sh; /* space handle for data register */ bus_space_tag_t sc_csr_st; /* space tag for control register */ bus_space_handle_t sc_csr_sh; /* space handle for control register */ int sc_flags; /* see below */ uint32_t sc_csrvalue; /* saved control register */ struct lock sc_lock; /* serialize operations to this EC */ UINT32 sc_glkhandle; /* global lock handle */ UINT32 sc_glk; /* need global lock? */ } *acpiec_ecdt_softc; static const char * const ec_hid[] = { "PNP0C09", NULL }; #define EC_F_PENDQUERY 0x02 /* query is pending */ /* * how long to wait to acquire global lock. * the value is taken from FreeBSD driver. */ #define EC_LOCK_TIMEOUT 1000 #define EC_DATA_READ(sc) \ bus_space_read_1((sc)->sc_data_st, (sc)->sc_data_sh, 0) #define EC_DATA_WRITE(sc, v) \ bus_space_write_1((sc)->sc_data_st, (sc)->sc_data_sh, 0, (v)) #define EC_CSR_READ(sc) \ bus_space_read_1((sc)->sc_csr_st, (sc)->sc_csr_sh, 0) #define EC_CSR_WRITE(sc, v) \ bus_space_write_1((sc)->sc_csr_st, (sc)->sc_csr_sh, 0, (v)) static __inline int EcIsLocked(struct acpi_ec_softc *sc) { return (lockstatus(&sc->sc_lock) == LK_EXCLUSIVE); } static __inline void EcLock(struct acpi_ec_softc *sc) { ACPI_STATUS status; lockmgr(&sc->sc_lock, LK_EXCLUSIVE, NULL); if (sc->sc_glk) { status = AcpiAcquireGlobalLock(EC_LOCK_TIMEOUT, &sc->sc_glkhandle); if (ACPI_FAILURE(status)) { printf("%s: failed to acquire global lock\n", sc->sc_dev.dv_xname); lockmgr(&sc->sc_lock, LK_RELEASE, NULL); return; } } } static __inline void EcUnlock(struct acpi_ec_softc *sc) { ACPI_STATUS status; if (sc->sc_glk) { status = AcpiReleaseGlobalLock(sc->sc_glkhandle); if (ACPI_FAILURE(status)) printf("%s: failed to release global lock\n", sc->sc_dev.dv_xname); } lockmgr(&sc->sc_lock, LK_RELEASE, NULL); } typedef struct { EC_COMMAND Command; UINT8 Address; UINT8 Data; } EC_REQUEST; static void EcGpeHandler(void *Context); static ACPI_STATUS EcSpaceSetup(ACPI_HANDLE Region, UINT32 Function, void *Context, void **return_Context); static ACPI_STATUS EcSpaceHandler(UINT32 Function, ACPI_PHYSICAL_ADDRESS Address, UINT32 width, ACPI_INTEGER *Value, void *Context, void *RegionContext); static ACPI_STATUS EcWaitEvent(struct acpi_ec_softc *sc, EC_EVENT Event); static ACPI_STATUS EcQuery(struct acpi_ec_softc *sc, UINT8 *Data); static ACPI_STATUS EcTransaction(struct acpi_ec_softc *sc, EC_REQUEST *EcRequest); static ACPI_STATUS EcRead(struct acpi_ec_softc *sc, UINT8 Address, UINT8 *Data); static ACPI_STATUS EcWrite(struct acpi_ec_softc *sc, UINT8 Address, UINT8 *Data); int acpiec_match(struct device *, struct cfdata *, void *); void acpiec_attach(struct device *, struct device *, void *); CFATTACH_DECL(acpiec, sizeof(struct acpi_ec_softc), acpiec_match, acpiec_attach, NULL, NULL); /* * acpiec_match: * * Autoconfiguration `match' routine. */ int acpiec_match(struct device *parent, struct cfdata *match, void *aux) { struct acpi_attach_args *aa = aux; if (aa->aa_node->ad_type != ACPI_TYPE_DEVICE) return (0); return (acpi_match_hid(aa->aa_node->ad_devinfo, ec_hid)); } #if 0 void acpiec_early_attach(struct device *parent) { EC_BOOT_RESOURCES *ep; ACPI_HANDLE handle; status = AcpiGetFirmwareTable("ECDT", 1, ACPI_LOGICAL_ADDRESSING, (ACPI_TABLE_HEADER **)&ep; if (ACPI_FAILURE(status)) return; if (ep->EcControl.RegisterBitWidth != 8 || ep->EcData.RegisterBitWidth != 8) { printf("%s: ECDT data is invalid, RegisterBitWidth=%d/%d\n", ep->EcControl.RegisterBitWidth, ep->EcData.RegisterBitWidth); return; } status = AcpiGetHandle(ACPI_ROOT_OBJECT, ep->EcId, &handle); if (ACPI_FAILURE(status)) { printf("%s: failed to look up EC object %s: %s\n", ep->EcId, AcpiFormatExeception(status)); return (status); } } #endif /* * acpiec_attach: * * Autoconfiguration `attach' routine. */ void acpiec_attach(struct device *parent, struct device *self, void *aux) { struct acpi_ec_softc *sc = (void *) self; struct acpi_attach_args *aa = aux; struct acpi_io *io0, *io1; ACPI_STATUS rv; ACPI_FUNCTION_TRACE(__FUNCTION__); printf(": ACPI Embedded Controller\n"); lockinit(&sc->sc_lock, PWAIT, "eclock", 0, 0); sc->sc_node = aa->aa_node; /* Parse our resources. */ ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "parsing EC resources\n")); rv = acpi_resource_parse(&sc->sc_dev, sc->sc_node, &sc->sc_res, &acpi_resource_parse_ops_default); if (ACPI_FAILURE(rv)) return; sc->sc_data_st = aa->aa_iot; io0 = acpi_res_io(&sc->sc_res, 0); if (io0 == NULL) { printf("%s: unable to find data register resource\n", sc->sc_dev.dv_xname); return; } if (bus_space_map(sc->sc_data_st, io0->ar_base, io0->ar_length, 0, &sc->sc_data_sh) != 0) { printf("%s: unable to map data register\n", sc->sc_dev.dv_xname); return; } sc->sc_csr_st = aa->aa_iot; io1 = acpi_res_io(&sc->sc_res, 1); if (io1 == NULL) { printf("%s: unable to find csr register resource\n", sc->sc_dev.dv_xname); return; } if (bus_space_map(sc->sc_csr_st, io1->ar_base, io1->ar_length, 0, &sc->sc_csr_sh) != 0) { printf("%s: unable to map csr register\n", sc->sc_dev.dv_xname); return; } /* * Install GPE handler. * * We evaluate the _GPE method to find the GPE bit used by the * Embedded Controller to signal status (SCI). */ rv = acpi_eval_integer(sc->sc_node->ad_handle, "_GPE", &sc->sc_gpebit); if (ACPI_FAILURE(rv)) { printf("%s: unable to evaluate _GPE: %s\n", sc->sc_dev.dv_xname, AcpiFormatException(rv)); return; } /* * evaluate _GLK to see if we should acquire global lock * when accessing the EC. */ rv = acpi_eval_integer(sc->sc_node->ad_handle, "_GLK", &sc->sc_glk); if (ACPI_FAILURE(rv)) { if (rv != AE_NOT_FOUND) printf("%s: unable to evaluate _GLK: %s\n", sc->sc_dev.dv_xname, AcpiFormatException(rv)); sc->sc_glk = 0; } /* * Install a handler for this EC's GPE bit. Note that EC SCIs are * treated as both edge- and level-triggered interrupts; in other words * we clear the status bit immediately after getting an EC-SCI, then * again after we're done processing the event. This guarantees that * events we cause while performing a transaction (e.g. IBE/OBF) get * cleared before re-enabling the GPE. */ rv = AcpiInstallGpeHandler(NULL, sc->sc_gpebit, ACPI_EVENT_EDGE_TRIGGERED, EcGpeHandler, sc); if (ACPI_FAILURE(rv)) { printf("%s: unable to install GPE handler: %s\n", sc->sc_dev.dv_xname, AcpiFormatException(rv)); return; } /* Install address space handler. */ rv = AcpiInstallAddressSpaceHandler(sc->sc_node->ad_handle, ACPI_ADR_SPACE_EC, EcSpaceHandler, EcSpaceSetup, sc); if (ACPI_FAILURE(rv)) { printf("%s: unable to install address space handler: %s\n", sc->sc_dev.dv_xname, AcpiFormatException(rv)); return; } return_VOID; } static void EcGpeQueryHandler(void *Context) { struct acpi_ec_softc *sc = Context; UINT8 Data; ACPI_STATUS Status; char qxx[5]; ACPI_FUNCTION_TRACE(__FUNCTION__); for (;;) { /* * Check EC_SCI. * * Bail out if the EC_SCI bit of the status register is not * set. Note that this function should only be called when * this bit is set (polling is used to detect IBE/OBF events). * * It is safe to do this without locking the controller, as * it's OK to call EcQuery when there's no data ready; in the * worst case we should just find nothing waiting for us and * bail. */ if ((EC_CSR_READ(sc) & EC_EVENT_SCI) == 0) break; /* * Find out why the EC is signalling us */ Status = EcQuery(sc, &Data); /* * If we failed to get anything from the EC, give up. */ if (ACPI_FAILURE(Status)) { printf("%s: GPE query failed: %s\n", sc->sc_dev.dv_xname, AcpiFormatException(Status)); break; } /* * Evaluate _Qxx to respond to the controller. */ sprintf(qxx, "_Q%02x", Data); strupr(qxx); Status = AcpiEvaluateObject(sc->sc_node->ad_handle, qxx, NULL, NULL); /* * Ignore spurious query requests. */ if (ACPI_FAILURE(Status) && (Data != 0 || Status != AE_NOT_FOUND)) { printf("%s: evaluation of GPE query method %s " "failed: %s\n", sc->sc_dev.dv_xname, qxx, AcpiFormatException(Status)); } } /* I know I request Level trigger cleanup */ Status = AcpiClearGpe(NULL, sc->sc_gpebit, ACPI_NOT_ISR); if (ACPI_FAILURE(Status)) printf("%s: AcpiClearGpe failed: %s\n", sc->sc_dev.dv_xname, AcpiFormatException(Status)); return_VOID; } static void EcGpeHandler(void *Context) { struct acpi_ec_softc *sc = Context; uint32_t csrvalue; ACPI_STATUS Status; /* * If EC is locked, the intr must process EcRead/Write wait only. * Query request must be pending. */ if (EcIsLocked(sc)) { csrvalue = EC_CSR_READ(sc); if (csrvalue & EC_EVENT_SCI) sc->sc_flags |= EC_F_PENDQUERY; if ((csrvalue & EC_FLAG_OUTPUT_BUFFER) != 0 || (csrvalue & EC_FLAG_INPUT_BUFFER) == 0) { sc->sc_csrvalue = csrvalue; wakeup(&sc->sc_csrvalue); } } else { /* Enqueue GpeQuery handler. */ Status = AcpiOsQueueForExecution(OSD_PRIORITY_HIGH, EcGpeQueryHandler, Context); if (ACPI_FAILURE(Status)) printf("%s: failed to enqueue query handler: %s\n", sc->sc_dev.dv_xname, AcpiFormatException(Status)); } } static ACPI_STATUS EcSpaceSetup(ACPI_HANDLE Region, UINT32 Function, void *Context, void **RegionContext) { ACPI_FUNCTION_TRACE(__FUNCTION__); /* * Just pass the context through, there's nothing to do here. */ *RegionContext = Context; return_ACPI_STATUS(AE_OK); } static ACPI_STATUS EcSpaceHandler(UINT32 Function, ACPI_PHYSICAL_ADDRESS Address, UINT32 width, ACPI_INTEGER *Value, void *Context, void *RegionContext) { struct acpi_ec_softc *sc = Context; ACPI_STATUS Status = AE_OK; EC_REQUEST EcRequest; int i; ACPI_FUNCTION_TRACE_U32(__FUNCTION__, (UINT32)Address); if ((Address > 0xFF) || (width % 8 != 0) || (Value == NULL) || (Context == NULL)) return_ACPI_STATUS(AE_BAD_PARAMETER); switch (Function) { case ACPI_READ: EcRequest.Command = EC_COMMAND_READ; EcRequest.Address = Address; (*Value) = 0; break; case ACPI_WRITE: EcRequest.Command = EC_COMMAND_WRITE; EcRequest.Address = Address; break; default: printf("%s: invalid Address Space function: %d\n", sc->sc_dev.dv_xname, Function); return_ACPI_STATUS(AE_BAD_PARAMETER); } /* * Perform the transaction. */ for (i = 0; i < width; i += 8) { if (Function == ACPI_READ) EcRequest.Data = 0; else EcRequest.Data = (UINT8)((*Value) >> i); Status = EcTransaction(sc, &EcRequest); if (ACPI_FAILURE(Status)) break; (*Value) |= (UINT32)EcRequest.Data << i; if (++EcRequest.Address == 0) return_ACPI_STATUS(AE_BAD_PARAMETER); } return_ACPI_STATUS(Status); } static ACPI_STATUS EcWaitEventIntr(struct acpi_ec_softc *sc, EC_EVENT Event) { EC_STATUS EcStatus; int i; ACPI_FUNCTION_TRACE_U32(__FUNCTION__, (UINT32)Event); /* XXX Need better test for "yes, you have interrupts". */ if (cold) return_ACPI_STATUS(EcWaitEvent(sc, Event)); if (EcIsLocked(sc) == 0) printf("%s: EcWaitEventIntr called without EC lock!\n", sc->sc_dev.dv_xname); EcStatus = EC_CSR_READ(sc); /* Too long? */ for (i = 0; i < 10; i++) { /* Check EC status against the desired event. */ if ((Event == EC_EVENT_OUTPUT_BUFFER_FULL) && (EcStatus & EC_FLAG_OUTPUT_BUFFER) != 0) return_ACPI_STATUS(AE_OK); if ((Event == EC_EVENT_INPUT_BUFFER_EMPTY) && (EcStatus & EC_FLAG_INPUT_BUFFER) == 0) return_ACPI_STATUS(AE_OK); sc->sc_csrvalue = 0; /* XXXJRT Sleeping with a lock held? */ if (tsleep(&sc->sc_csrvalue, 0, "EcWait", 1) != EWOULDBLOCK) EcStatus = sc->sc_csrvalue; else EcStatus = EC_CSR_READ(sc); } return_ACPI_STATUS(AE_ERROR); } static ACPI_STATUS EcWaitEvent(struct acpi_ec_softc *sc, EC_EVENT Event) { EC_STATUS EcStatus; UINT32 i = 0; if (EcIsLocked(sc) == 0) printf("%s: EcWaitEvent called without EC lock!\n", sc->sc_dev.dv_xname); /* * Stall 1us: * ---------- * Stall for 1 microsecond before reading the status register * for the first time. This allows the EC to set the IBF/OBF * bit to its proper state. * * XXX it is not clear why we read the CSR twice. */ AcpiOsStall(1); EcStatus = EC_CSR_READ(sc); /* * Wait For Event: * --------------- * Poll the EC status register to detect completion of the last * command. Wait up to 10ms (in 100us chunks) for this to occur. */ for (i = 0; i < 100; i++) { EcStatus = EC_CSR_READ(sc); if ((Event == EC_EVENT_OUTPUT_BUFFER_FULL) && (EcStatus & EC_FLAG_OUTPUT_BUFFER) != 0) return (AE_OK); if ((Event == EC_EVENT_INPUT_BUFFER_EMPTY) && (EcStatus & EC_FLAG_INPUT_BUFFER) == 0) return (AE_OK); AcpiOsStall(10); } return (AE_ERROR); } static ACPI_STATUS EcQuery(struct acpi_ec_softc *sc, UINT8 *Data) { ACPI_STATUS Status; EcLock(sc); EC_CSR_WRITE(sc, EC_COMMAND_QUERY); Status = EcWaitEvent(sc, EC_EVENT_OUTPUT_BUFFER_FULL); if (ACPI_SUCCESS(Status)) *Data = EC_DATA_READ(sc); EcUnlock(sc); if (ACPI_FAILURE(Status)) printf("%s: timed out waiting for EC to respond to " "EC_COMMAND_QUERY\n", sc->sc_dev.dv_xname); return (Status); } static ACPI_STATUS EcTransaction(struct acpi_ec_softc *sc, EC_REQUEST *EcRequest) { ACPI_STATUS Status; EcLock(sc); /* * Perform the transaction. */ switch (EcRequest->Command) { case EC_COMMAND_READ: Status = EcRead(sc, EcRequest->Address, &(EcRequest->Data)); break; case EC_COMMAND_WRITE: Status = EcWrite(sc, EcRequest->Address, &(EcRequest->Data)); break; default: Status = AE_SUPPORT; break; } /* * Clear & Re-Enable the EC GPE: * ----------------------------- * 'Consume' any EC GPE events that we generated while performing * the transaction (e.g. IBF/OBF). Clearing the GPE here shouldn't * have an adverse affect on outstanding EC-SCI's, as the source * (EC-SCI) will still be high and thus should trigger the GPE * immediately after we re-enabling it. */ if (sc->sc_flags & EC_F_PENDQUERY) { ACPI_STATUS Status2; Status2 = AcpiOsQueueForExecution(OSD_PRIORITY_HIGH, EcGpeQueryHandler, sc); if (ACPI_FAILURE(Status2)) printf("%s: unable to queue pending query: %s\n", sc->sc_dev.dv_xname, AcpiFormatException(Status2)); sc->sc_flags &= ~EC_F_PENDQUERY; } EcUnlock(sc); return(Status); } static ACPI_STATUS EcRead(struct acpi_ec_softc *sc, UINT8 Address, UINT8 *Data) { ACPI_STATUS Status; if (EcIsLocked(sc) == 0) printf("%s: EcRead called without EC lock!\n", sc->sc_dev.dv_xname); /* EcBurstEnable(EmbeddedController); */ EC_CSR_WRITE(sc, EC_COMMAND_READ); if ((Status = EcWaitEventIntr(sc, EC_EVENT_INPUT_BUFFER_EMPTY)) != AE_OK) { printf("%s: EcRead: timeout waiting for EC to process " "read command\n", sc->sc_dev.dv_xname); return (Status); } EC_DATA_WRITE(sc, Address); if ((Status = EcWaitEventIntr(sc, EC_EVENT_OUTPUT_BUFFER_FULL)) != AE_OK) { printf("%s: EcRead: timeout waiting for EC to send data\n", sc->sc_dev.dv_xname); return (Status); } (*Data) = EC_DATA_READ(sc); /* EcBurstDisable(EmbeddedController); */ return (AE_OK); } static ACPI_STATUS EcWrite(struct acpi_ec_softc *sc, UINT8 Address, UINT8 *Data) { ACPI_STATUS Status; if (EcIsLocked(sc) == 0) printf("%s: EcWrite called without EC lock!\n", sc->sc_dev.dv_xname); /* EcBurstEnable(EmbeddedController); */ EC_CSR_WRITE(sc, EC_COMMAND_WRITE); if ((Status = EcWaitEventIntr(sc, EC_EVENT_INPUT_BUFFER_EMPTY)) != AE_OK) { printf("%s: EcWrite: timeout waiting for EC to process " "write command\n", sc->sc_dev.dv_xname); return (Status); } EC_DATA_WRITE(sc, Address); if ((Status = EcWaitEventIntr(sc, EC_EVENT_INPUT_BUFFER_EMPTY)) != AE_OK) { printf("%s: EcWrite: timeout waiting for EC to process " "address\n", sc->sc_dev.dv_xname); return (Status); } EC_DATA_WRITE(sc, *Data); if ((Status = EcWaitEventIntr(sc, EC_EVENT_INPUT_BUFFER_EMPTY)) != AE_OK) { printf("%s: EcWrite: timeout waiting for EC to process " "data\n", sc->sc_dev.dv_xname); return (Status); } /* EcBurstDisable(EmbeddedController); */ return (AE_OK); }