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/* $NetBSD: acpi_ec.c,v 1.40 2006/11/16 01:32:47 christos 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: acpi_ec.c,v 1.40 2006/11/16 01:32:47 christos Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <machine/bus.h>
#include <dev/acpi/acpica.h>
#include <dev/acpi/acpireg.h>
#include <dev/acpi/acpivar.h>
#include <dev/acpi/acpi_ecreg.h>
MALLOC_DECLARE(M_ACPI);
#define _COMPONENT ACPI_EC_COMPONENT
ACPI_MODULE_NAME("EC")
struct acpi_ec_softc {
struct device sc_dev; /* base device glue */
ACPI_HANDLE sc_handle; /* ACPI handle */
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 */
uint32_t sc_uid; /* _UID in namespace (ECDT only) */
struct lock sc_lock; /* serialize operations to this EC */
struct simplelock sc_slock; /* protect against interrupts */
UINT32 sc_glkhandle; /* global lock handle */
UINT32 sc_glk; /* need global lock? */
};
static const char * const ec_hid[] = {
"PNP0C09",
NULL
};
#define EC_F_TRANSACTION 0x01 /* doing transaction */
#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))
typedef struct {
EC_COMMAND Command;
UINT8 Address;
UINT8 Data;
} EC_REQUEST;
static UINT32 EcGpeHandler(void *);
static ACPI_STATUS EcSpaceSetup(ACPI_HANDLE, UINT32, void *, void **);
static ACPI_STATUS EcSpaceHandler(UINT32, ACPI_PHYSICAL_ADDRESS, UINT32,
ACPI_INTEGER *, void *, void *);
static ACPI_STATUS EcWaitEvent(struct acpi_ec_softc *, EC_EVENT);
static ACPI_STATUS EcQuery(struct acpi_ec_softc *, UINT8 *);
static ACPI_STATUS EcTransaction(struct acpi_ec_softc *, EC_REQUEST *);
static ACPI_STATUS EcRead(struct acpi_ec_softc *, UINT8, UINT8 *);
static ACPI_STATUS EcWrite(struct acpi_ec_softc *, UINT8, UINT8 *);
static void EcGpeQueryHandler(void *);
static inline int EcIsLocked(struct acpi_ec_softc *);
static inline void EcLock(struct acpi_ec_softc *);
static inline void EcUnlock(struct acpi_ec_softc *);
static int acpiec_match(struct device *, struct cfdata *, void *);
static void acpiec_attach(struct device *, struct device *, void *);
CFATTACH_DECL(acpiec, sizeof(struct acpi_ec_softc),
acpiec_match, acpiec_attach, NULL, NULL);
static struct acpi_ec_softc *ecdt_sc;
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 rv;
int s;
lockmgr(&sc->sc_lock, LK_EXCLUSIVE, NULL);
if (sc->sc_glk) {
rv = AcpiAcquireGlobalLock(EC_LOCK_TIMEOUT,
&sc->sc_glkhandle);
if (ACPI_FAILURE(rv)) {
printf("%s: failed to acquire global lock\n",
sc->sc_dev.dv_xname);
lockmgr(&sc->sc_lock, LK_RELEASE, NULL);
return;
}
}
s = splvm(); /* XXX */
simple_lock(&sc->sc_slock);
sc->sc_flags |= EC_F_TRANSACTION;
simple_unlock(&sc->sc_slock);
splx(s);
}
static inline void
EcUnlock(struct acpi_ec_softc *sc)
{
ACPI_STATUS rv;
int s;
/*
* 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.
*/
s = splvm(); /* XXX */
simple_lock(&sc->sc_slock);
if (sc->sc_flags & EC_F_PENDQUERY) {
ACPI_STATUS rv2;
rv2 = AcpiOsQueueForExecution(OSD_PRIORITY_HIGH,
EcGpeQueryHandler, sc);
if (ACPI_FAILURE(rv2))
printf("%s: unable to queue pending query: %s\n",
sc->sc_dev.dv_xname, AcpiFormatException(rv2));
sc->sc_flags &= ~EC_F_PENDQUERY;
}
sc->sc_flags &= ~EC_F_TRANSACTION;
simple_unlock(&sc->sc_slock);
splx(s);
if (sc->sc_glk) {
rv = AcpiReleaseGlobalLock(sc->sc_glkhandle);
if (ACPI_FAILURE(rv))
printf("%s: failed to release global lock\n",
sc->sc_dev.dv_xname);
}
lockmgr(&sc->sc_lock, LK_RELEASE, NULL);
}
/*
* acpiec_match:
*
* Autoconfiguration `match' routine.
*/
static 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);
}
void
acpiec_early_attach(struct device *parent)
{
struct acpi_softc *sc = (struct acpi_softc *)parent;
EC_BOOT_RESOURCES *ep;
ACPI_HANDLE handle;
ACPI_STATUS rv;
ACPI_INTEGER tmp;
rv = AcpiGetFirmwareTable("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
(void *)&ep);
if (ACPI_FAILURE(rv))
return;
if (ep->EcControl.RegisterBitWidth != 8 ||
ep->EcData.RegisterBitWidth != 8) {
printf("%s: ECDT data is invalid, RegisterBitWidth=%d/%d\n",
parent->dv_xname,
ep->EcControl.RegisterBitWidth,
ep->EcData.RegisterBitWidth);
return;
}
rv = AcpiGetHandle(ACPI_ROOT_OBJECT, ep->EcId, &handle);
if (ACPI_FAILURE(rv)) {
printf("%s: failed to look up EC object %s: %s\n",
parent->dv_xname,
ep->EcId, AcpiFormatException(rv));
return;
}
ecdt_sc = malloc(sizeof(*ecdt_sc), M_ACPI, M_ZERO);
strcpy(ecdt_sc->sc_dev.dv_xname, "acpiecdt0"); /* XXX */
ecdt_sc->sc_handle = handle;
ecdt_sc->sc_gpebit = ep->GpeBit;
ecdt_sc->sc_uid = ep->Uid;
ecdt_sc->sc_data_st = sc->sc_iot;
if (bus_space_map(ecdt_sc->sc_data_st,
(bus_addr_t)(ep->EcData.Address), 1, 0,
&ecdt_sc->sc_data_sh) != 0) {
printf("%s: bus_space_map failed for EC data.\n",
parent->dv_xname);
goto out1;
}
ecdt_sc->sc_csr_st = sc->sc_iot;
if (bus_space_map(ecdt_sc->sc_csr_st,
(bus_addr_t)(ep->EcControl.Address), 1, 0,
&ecdt_sc->sc_csr_sh) != 0) {
printf("%s: bus_space_map failed for EC control.\n",
parent->dv_xname);
goto out2;
}
rv = acpi_eval_integer(handle, "_GLK", &tmp);
if (ACPI_SUCCESS(rv) && tmp == 1)
ecdt_sc->sc_glk = 1;
rv = AcpiInstallGpeHandler(NULL, ecdt_sc->sc_gpebit,
ACPI_GPE_EDGE_TRIGGERED, EcGpeHandler, ecdt_sc);
if (ACPI_FAILURE(rv)) {
printf("%s: unable to install GPE handler: %s\n",
parent->dv_xname, AcpiFormatException(rv));
goto out3;
}
rv = AcpiSetGpeType(NULL, ecdt_sc->sc_gpebit, ACPI_GPE_TYPE_RUNTIME);
if (ACPI_FAILURE(rv)) {
printf("%s: unable to set GPE type: %s\n",
parent->dv_xname, AcpiFormatException(rv));
goto out4;
}
rv = AcpiEnableGpe(NULL, ecdt_sc->sc_gpebit, ACPI_NOT_ISR);
if (ACPI_FAILURE(rv)) {
printf("%s: unable to enable GPE: %s\n",
parent->dv_xname, AcpiFormatException(rv));
goto out4;
}
rv = AcpiInstallAddressSpaceHandler(ACPI_ROOT_OBJECT,
ACPI_ADR_SPACE_EC, EcSpaceHandler, EcSpaceSetup, ecdt_sc);
if (ACPI_FAILURE(rv)) {
printf("%s: unable to install address space handler: %s\n",
parent->dv_xname,
AcpiFormatException(rv));
goto out4;
}
printf("%s: found ECDT, GPE %d\n", parent->dv_xname,
ecdt_sc->sc_gpebit);
lockinit(&ecdt_sc->sc_lock, PWAIT, "eclock", 0, 0);
simple_lock_init(&ecdt_sc->sc_slock);
AcpiOsUnmapMemory(ep, ep->Length);
return;
out4:
AcpiRemoveGpeHandler(NULL, ecdt_sc->sc_gpebit, EcGpeHandler);
out3:
bus_space_unmap(ecdt_sc->sc_csr_st, ecdt_sc->sc_csr_sh, 1);
out2:
bus_space_unmap(ecdt_sc->sc_data_st, ecdt_sc->sc_data_sh, 1);
out1:
free(ecdt_sc, M_ACPI);
ecdt_sc = NULL;
AcpiOsUnmapMemory(ep, ep->Length);
return;
}
/*
* acpiec_attach:
*
* Autoconfiguration `attach' routine.
*/
static 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;
struct acpi_resources res;
ACPI_STATUS rv;
ACPI_INTEGER v;
ACPI_FUNCTION_TRACE(__FUNCTION__);
aprint_naive(": ACPI Embedded Controller\n");
aprint_normal(": ACPI Embedded Controller\n");
lockinit(&sc->sc_lock, PWAIT, "eclock", 0, 0);
simple_lock_init(&sc->sc_slock);
sc->sc_handle = aa->aa_node->ad_handle;
/* Parse our resources. */
ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "parsing EC resources\n"));
rv = acpi_resource_parse(&sc->sc_dev, sc->sc_handle, "_CRS",
&res, &acpi_resource_parse_ops_default);
if (ACPI_FAILURE(rv))
return;
#define adi aa->aa_node->ad_devinfo
/* check if we already attached EC via ECDT */
if (ecdt_sc &&
((adi->Valid & ACPI_VALID_UID) == ACPI_VALID_UID) &&
ecdt_sc->sc_uid == strtoul(adi->UniqueId.Value, NULL, 10)) {
/* detach all ECDT handles */
rv = AcpiRemoveAddressSpaceHandler(ACPI_ROOT_OBJECT,
ACPI_ADR_SPACE_EC, EcSpaceHandler);
if (ACPI_FAILURE(rv))
aprint_error("ERROR: RemoveAddressSpaceHandler: %s\n",
AcpiFormatException(rv));
rv = AcpiRemoveGpeHandler(NULL, ecdt_sc->sc_gpebit,
EcGpeHandler);
if (ACPI_FAILURE(rv))
aprint_error("ERROR: RemoveAddressSpaceHandler: %s\n",
AcpiFormatException(rv));
bus_space_unmap(ecdt_sc->sc_csr_st,
ecdt_sc->sc_csr_sh, 1);
bus_space_unmap(ecdt_sc->sc_data_st,
ecdt_sc->sc_data_sh, 1);
free(ecdt_sc, M_ACPI);
ecdt_sc = NULL;
}
#undef adi
sc->sc_data_st = aa->aa_iot;
io0 = acpi_res_io(&res, 0);
if (io0 == NULL) {
aprint_error("%s: unable to find data register resource\n",
sc->sc_dev.dv_xname);
goto out;
}
if (bus_space_map(sc->sc_data_st, io0->ar_base, io0->ar_length,
0, &sc->sc_data_sh) != 0) {
aprint_error("%s: unable to map data register\n",
sc->sc_dev.dv_xname);
goto out;
}
sc->sc_csr_st = aa->aa_iot;
io1 = acpi_res_io(&res, 1);
if (io1 == NULL) {
aprint_error("%s: unable to find csr register resource\n",
sc->sc_dev.dv_xname);
goto out;
}
if (bus_space_map(sc->sc_csr_st, io1->ar_base, io1->ar_length,
0, &sc->sc_csr_sh) != 0) {
aprint_error("%s: unable to map csr register\n",
sc->sc_dev.dv_xname);
goto out;
}
/*
* evaluate _GLK to see if we should acquire global lock
* when accessing the EC.
*/
rv = acpi_eval_integer(sc->sc_handle, "_GLK", &v);
if (ACPI_FAILURE(rv)) {
if (rv != AE_NOT_FOUND)
aprint_error("%s: unable to evaluate _GLK: %s\n",
sc->sc_dev.dv_xname,
AcpiFormatException(rv));
sc->sc_glk = 0;
} else
sc->sc_glk = v;
/*
* 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_handle, "_GPE", &v);
if (ACPI_FAILURE(rv)) {
aprint_error("%s: unable to evaluate _GPE: %s\n",
sc->sc_dev.dv_xname, AcpiFormatException(rv));
goto out;
}
sc->sc_gpebit = v;
/*
* 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_GPE_EDGE_TRIGGERED, EcGpeHandler, sc);
if (ACPI_FAILURE(rv)) {
aprint_error("%s: unable to install GPE handler: %s\n",
sc->sc_dev.dv_xname, AcpiFormatException(rv));
goto out;
}
rv = AcpiSetGpeType(NULL, sc->sc_gpebit, ACPI_GPE_TYPE_RUNTIME);
if (ACPI_FAILURE(rv)) {
aprint_error("%s: unable to set GPE type: %s\n",
sc->sc_dev.dv_xname, AcpiFormatException(rv));
goto out2;
}
rv = AcpiEnableGpe(NULL, sc->sc_gpebit, ACPI_NOT_ISR);
if (ACPI_FAILURE(rv)) {
aprint_error("%s: unable to enable GPE: %s\n",
sc->sc_dev.dv_xname, AcpiFormatException(rv));
goto out2;
}
/* Install address space handler. */
rv = AcpiInstallAddressSpaceHandler(sc->sc_handle,
ACPI_ADR_SPACE_EC, EcSpaceHandler, EcSpaceSetup, sc);
if (ACPI_FAILURE(rv)) {
aprint_error("%s: unable to install address space handler: %s\n",
sc->sc_dev.dv_xname, AcpiFormatException(rv));
goto out2;
}
return_VOID;
out2:
(void)AcpiRemoveGpeHandler(NULL, sc->sc_gpebit, EcGpeHandler);
out:
acpi_resource_cleanup(&res);
return_VOID;
}
static void
EcGpeQueryHandler(void *Context)
{
struct acpi_ec_softc *sc = Context;
UINT8 Data = 0;
ACPI_STATUS rv;
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;
EcLock(sc);
/*
* Find out why the EC is signalling us
*/
rv = EcQuery(sc, &Data);
EcUnlock(sc);
/*
* If we failed to get anything from the EC, give up.
*/
if (ACPI_FAILURE(rv)) {
printf("%s: GPE query failed: %s\n",
sc->sc_dev.dv_xname, AcpiFormatException(rv));
break;
}
/*
* Evaluate _Qxx to respond to the controller.
*/
snprintf(qxx, sizeof(qxx), "_Q%02X", Data);
rv = AcpiEvaluateObject(sc->sc_handle, qxx,
NULL, NULL);
/*
* Ignore spurious query requests.
*/
if (ACPI_FAILURE(rv) &&
(Data != 0 || rv != AE_NOT_FOUND)) {
printf("%s: evaluation of GPE query method %s "
"failed: %s\n", sc->sc_dev.dv_xname, qxx,
AcpiFormatException(rv));
}
}
/* I know I request Level trigger cleanup */
rv = AcpiClearGpe(NULL, sc->sc_gpebit, ACPI_NOT_ISR);
if (ACPI_FAILURE(rv))
printf("%s: AcpiClearGpe failed: %s\n", sc->sc_dev.dv_xname,
AcpiFormatException(rv));
return_VOID;
}
static UINT32
EcGpeHandler(void *Context)
{
struct acpi_ec_softc *sc = Context;
uint32_t csrvalue;
ACPI_STATUS rv;
/*
* If EC is locked, the intr must process EcRead/Write wait only.
* Query request must be pending.
*/
simple_lock(&sc->sc_slock);
if (sc->sc_flags & EC_F_TRANSACTION) {
csrvalue = EC_CSR_READ(sc);
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);
}
simple_unlock(&sc->sc_slock);
} else {
simple_unlock(&sc->sc_slock);
/* Enqueue GpeQuery handler. */
rv = AcpiOsQueueForExecution(OSD_PRIORITY_HIGH,
EcGpeQueryHandler, Context);
if (ACPI_FAILURE(rv))
printf("%s: failed to enqueue query handler: %s\n",
sc->sc_dev.dv_xname, AcpiFormatException(rv));
}
return 0; /* XXX not yet used in ACPI-CA */
}
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.
*/
if (Function == ACPI_REGION_DEACTIVATE)
*RegionContext = NULL;
else
*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 rv = 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);
rv = EcTransaction(sc, &EcRequest);
if (ACPI_FAILURE(rv))
break;
(*Value) |= (UINT32)EcRequest.Data << i;
if (++EcRequest.Address == 0)
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
return_ACPI_STATUS(rv);
}
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", (hz + 99) / 100)
!= 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 rv;
if (EcIsLocked(sc) == 0)
printf("%s: EcQuery called without EC lock!\n",
sc->sc_dev.dv_xname);
EC_CSR_WRITE(sc, EC_COMMAND_QUERY);
rv = EcWaitEventIntr(sc, EC_EVENT_OUTPUT_BUFFER_FULL);
if (ACPI_SUCCESS(rv))
*Data = EC_DATA_READ(sc);
if (ACPI_FAILURE(rv))
printf("%s: timed out waiting for EC to respond to "
"EC_COMMAND_QUERY\n", sc->sc_dev.dv_xname);
return rv;
}
static ACPI_STATUS
EcTransaction(struct acpi_ec_softc *sc, EC_REQUEST *EcRequest)
{
ACPI_STATUS rv;
EcLock(sc);
/*
* Perform the transaction.
*/
switch (EcRequest->Command) {
case EC_COMMAND_READ:
rv = EcRead(sc, EcRequest->Address, &(EcRequest->Data));
break;
case EC_COMMAND_WRITE:
rv = EcWrite(sc, EcRequest->Address, &(EcRequest->Data));
break;
default:
rv = AE_SUPPORT;
break;
}
EcUnlock(sc);
return rv;
}
static ACPI_STATUS
EcRead(struct acpi_ec_softc *sc, UINT8 Address, UINT8 *Data)
{
ACPI_STATUS rv;
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 ((rv = 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 rv;
}
EC_DATA_WRITE(sc, Address);
if ((rv = 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 rv;
}
(*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 rv;
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 ((rv = 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 rv;
}
EC_DATA_WRITE(sc, Address);
if ((rv = 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 rv;
}
EC_DATA_WRITE(sc, *Data);
if ((rv = 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 rv;
}
/* EcBurstDisable(EmbeddedController); */
return AE_OK;
}
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