freebsd-skq/sys/dev/acpica/acpi_ec.c
Mike Smith 15e32d5d03 Initial FreeBSD OSPM (operating system power management) modules for
ACPICA.  Most of these are still works in progress.  Support exists for:

 - Fixed feature and control method power, lid and sleep buttons.
 - Detection of ISA PnP devices using ACPI namespace.
 - Detection of PCI root busses using ACPI namespace.
 - CPU throttling and sleep states (incomplete)
 - Thermal monitoring and cooling control (incomplete)
 - Interface to platform embedded controllers (mostly complete)
 - ACPI timer (incomplete)
 - Simple userland control of sleep states.
 - Shutdown and poweroff.
2000-10-28 06:59:48 +00:00

711 lines
23 KiB
C

/*-
* 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.
*
* $FreeBSD$
*/
/******************************************************************************
*
* 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 "opt_acpi.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/bus.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/rman.h>
#include "acpi.h"
#include <dev/acpica/acpivar.h>
#include <dev/acpica/acpi_ecreg.h>
struct acpi_ec_softc {
device_t ec_dev;
ACPI_HANDLE ec_handle;
ACPI_HANDLE ec_semaphore;
UINT32 ec_gpebit;
int ec_data_rid;
struct resource *ec_data_res;
bus_space_tag_t ec_data_tag;
bus_space_handle_t ec_data_handle;
int ec_csr_rid;
struct resource *ec_csr_res;
bus_space_tag_t ec_csr_tag;
bus_space_handle_t ec_csr_handle;
int ec_locked;
};
#define EC_LOCK_TIMEOUT 1000 /* 1ms */
static __inline ACPI_STATUS
EcLock(struct acpi_ec_softc *sc)
{
ACPI_STATUS status;
status = AcpiOsWaitSemaphore((sc)->ec_semaphore, 1, EC_LOCK_TIMEOUT);
(sc)->ec_locked = 1;
return(status);
}
static __inline void
EcUnlock(struct acpi_ec_softc *sc)
{
(sc)->ec_locked = 0;
AcpiOsSignalSemaphore((sc)->ec_semaphore, 1);
}
static __inline int
EcIsLocked(struct acpi_ec_softc *sc)
{
return((sc)->ec_locked != 0);
}
typedef struct
{
EC_COMMAND Command;
UINT8 Address;
UINT8 Data;
} EC_REQUEST;
static struct acpi_ec_softc acpi_ec_default; /* for the default EC handler */
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, UINT32 Address, UINT32 width, UINT32 *Value,
void *Context, void *RegionContext);
static ACPI_STATUS EcDefaultSpaceHandler(UINT32 Function, UINT32 Address, UINT32 width, UINT32 *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);
static void acpi_ec_identify(driver_t driver, device_t bus);
static int acpi_ec_probe(device_t dev);
static int acpi_ec_attach(device_t dev);
static device_method_t acpi_ec_methods[] = {
/* Device interface */
DEVMETHOD(device_identify, acpi_ec_identify),
DEVMETHOD(device_probe, acpi_ec_probe),
DEVMETHOD(device_attach, acpi_ec_attach),
{0, 0}
};
static driver_t acpi_ec_driver = {
"acpi_ec",
acpi_ec_methods,
sizeof(struct acpi_ec_softc),
};
devclass_t acpi_ec_devclass;
DRIVER_MODULE(acpi_ec, acpi, acpi_ec_driver, acpi_ec_devclass, 0, 0);
/*
* Look for an ECDT table and if we find one, set up a default EC
* space handler to catch possible attempts to access EC space before
* we have a real driver instance in place.
* We're not really an identify routine, but because we get called
* before most other things, this works out OK.
*/
static void
acpi_ec_identify(driver_t driver, device_t bus)
{
ACPI_STATUS Status;
/* XXX implement - need an ACPI 2.0 system to test this */
/*
* XXX install a do-nothing handler at the top of the namespace to catch
* bogus accesses being made due to apparent interpreter bugs.
*/
acpi_ec_default.ec_dev = bus;
if ((Status = AcpiInstallAddressSpaceHandler(ACPI_ROOT_OBJECT, ADDRESS_SPACE_EC,
&EcDefaultSpaceHandler, &EcSpaceSetup,
&acpi_ec_default)) != AE_OK) {
device_printf(acpi_ec_default.ec_dev, "can't install default EC address space handler - %s\n",
acpi_strerror(Status));
}
}
/*
* We could setup resources in the probe routine in order to have them printed
* when the device is attached.
*/
static int
acpi_ec_probe(device_t dev)
{
if ((acpi_get_type(dev) == ACPI_TYPE_DEVICE) &&
acpi_MatchHid(dev, "PNP0C09")) {
/*
* Set device description
*/
device_set_desc(dev, "embedded controller");
return(0);
}
return(ENXIO);
}
static int
acpi_ec_attach(device_t dev)
{
struct acpi_ec_softc *sc;
ACPI_BUFFER *bufp;
UINT32 *param;
ACPI_STATUS Status;
struct acpi_object_list *args;
/*
* Fetch/initialise softc
*/
sc = device_get_softc(dev);
sc->ec_dev = dev;
sc->ec_handle = acpi_get_handle(dev);
/*
* Evaluate resources
*/
acpi_parse_resources(sc->ec_dev, sc->ec_handle, &acpi_res_parse_set);
/*
* Attach bus resources
*/
sc->ec_data_rid = 0;
if ((sc->ec_data_res = bus_alloc_resource(sc->ec_dev, SYS_RES_IOPORT, &sc->ec_data_rid,
0, ~0, 1, RF_ACTIVE)) == NULL) {
device_printf(dev, "can't allocate data port\n");
return(ENXIO);
}
sc->ec_data_tag = rman_get_bustag(sc->ec_data_res);
sc->ec_data_handle = rman_get_bushandle(sc->ec_data_res);
sc->ec_csr_rid = 1;
if ((sc->ec_csr_res = bus_alloc_resource(sc->ec_dev, SYS_RES_IOPORT, &sc->ec_csr_rid,
0, ~0, 1, RF_ACTIVE)) == NULL) {
device_printf(dev, "can't allocate command/status port\n");
return(ENXIO);
}
sc->ec_csr_tag = rman_get_bustag(sc->ec_csr_res);
sc->ec_csr_handle = rman_get_bushandle(sc->ec_csr_res);
/*
* Create serialisation semaphore
*/
if ((Status = AcpiOsCreateSemaphore(1, 1, &sc->ec_semaphore)) != AE_OK) {
device_printf(dev, "can't create semaphore - %s\n", acpi_strerror(Status));
return(ENXIO);
}
/*
* Install GPE handler
*
* Evaluate the _GPE method to find the GPE bit used by the EC to signal
* status (SCI).
*/
if ((bufp = acpi_AllocBuffer(16)) == NULL)
return(ENOMEM);
if ((Status = AcpiEvaluateObject(sc->ec_handle, "_GPE", NULL, bufp)) != AE_OK) {
device_printf(dev, "can't evaluate _GPE method - %s\n", acpi_strerror(Status));
return(ENXIO);
}
param = (UINT32 *)bufp->Pointer;
if (param[0] != ACPI_TYPE_NUMBER) {
device_printf(dev, "_GPE method returned bad result\n");
return(ENXIO);
}
sc->ec_gpebit = param[1];
AcpiOsFree(bufp);
/*
* 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.
*/
if ((Status = AcpiInstallGpeHandler(sc->ec_gpebit, ACPI_EVENT_LEVEL_TRIGGERED | ACPI_EVENT_EDGE_TRIGGERED,
EcGpeHandler, sc)) != AE_OK) {
device_printf(dev, "can't install GPE handler - %s\n", acpi_strerror(Status));
return(ENXIO);
}
/*
* Install address space handler
*/
if ((Status = AcpiInstallAddressSpaceHandler(sc->ec_handle, ADDRESS_SPACE_EC,
&EcSpaceHandler, &EcSpaceSetup, sc)) != AE_OK) {
device_printf(dev, "can't install address space handler - %s\n", acpi_strerror(Status));
return(ENXIO);
}
/*
* Evaluate _REG to indicate that the region is now available.
*/
if ((args = acpi_AllocObjectList(2)) == NULL)
return(ENOMEM);
args->object[0].Type = ACPI_TYPE_NUMBER;
args->object[0].Number.Value = ADDRESS_SPACE_EC;
args->object[1].Type = ACPI_TYPE_NUMBER;
args->object[1].Number.Value = 1;
Status = AcpiEvaluateObject(sc->ec_handle, "_REG", (ACPI_OBJECT_LIST *)args, NULL);
AcpiOsFree(args);
/*
* If evaluation failed for some reason other than that the method didn't
* exist, that's bad and we should not attach.
*/
if ((Status != AE_OK) && (Status != AE_NOT_FOUND)) {
device_printf(dev, "can't evaluate _REG method - %s\n", acpi_strerror(Status));
return(ENXIO);
}
return(0);
}
static void
EcGpeHandler(void *Context)
{
struct acpi_ec_softc *sc = (struct acpi_ec_softc *)Context;
UINT8 Data;
ACPI_STATUS Status;
char qxx[5];
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_GET_CSR(sc) & EC_EVENT_SCI))
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 (Status != AE_OK) {
device_printf(sc->ec_dev, "GPE query failed - %s\n", acpi_strerror(Status));
break;
}
/*
* Evaluate _Qxx to respond to the controller.
*/
sprintf(qxx, "_Q%02x", Data);
strupr(qxx);
if ((Status - AcpiEvaluateObject(sc->ec_handle, qxx, NULL, NULL)) != AE_OK) {
device_printf(sc->ec_dev, "evaluation of GPE query method %s failed - %s\n",
qxx, acpi_strerror(Status));
}
}
}
static ACPI_STATUS
EcSpaceSetup(ACPI_HANDLE Region, UINT32 Function, void *Context, void **RegionContext)
{
/*
* Just pass the context through, there's nothing to do here.
*/
*RegionContext = Context;
return(AE_OK);
}
static ACPI_STATUS
EcSpaceHandler(UINT32 Function, UINT32 Address, UINT32 width, UINT32 *Value, void *Context, void *RegionContext)
{
struct acpi_ec_softc *sc = (struct acpi_ec_softc *)Context;
ACPI_STATUS Status = AE_OK;
EC_REQUEST EcRequest;
if ((Address > 0xFF) || (width != 8) || (Value == NULL) || (Context == NULL))
return(AE_BAD_PARAMETER);
switch (Function) {
case ADDRESS_SPACE_READ:
EcRequest.Command = EC_COMMAND_READ;
EcRequest.Address = Address;
EcRequest.Data = 0;
break;
case ADDRESS_SPACE_WRITE:
EcRequest.Command = EC_COMMAND_WRITE;
EcRequest.Address = Address;
EcRequest.Data = (UINT8)(*Value);
break;
default:
device_printf(sc->ec_dev, "invalid Address Space function %d\n", Function);
return(AE_BAD_PARAMETER);
}
/*
* Perform the transaction.
*/
if ((Status = EcTransaction(sc, &EcRequest)) == AE_OK)
(*Value) = (UINT32)EcRequest.Data;
return(Status);
}
static ACPI_STATUS
EcDefaultSpaceHandler(UINT32 Function, UINT32 Address, UINT32 width, UINT32 *Value, void *Context, void *RegionContext)
{
if ((Address > 0xFF) || (width != 8) || (Value == NULL) || (Context == NULL))
return(AE_BAD_PARAMETER);
switch (Function) {
case ADDRESS_SPACE_READ:
printf("ACPI: Illegal EC read from 0x%x\n", Address);
*Value = 0;
break;
case ADDRESS_SPACE_WRITE:
printf("ACPI: Illegal EC write 0x%x to 0x%x\n", *Value, Address);
break;
default:
printf("ACPI: Illegal EC unknown operation");
break;
}
/* let things keep going */
return(AE_OK);
}
static ACPI_STATUS
EcWaitEvent(struct acpi_ec_softc *sc, EC_EVENT Event)
{
EC_STATUS EcStatus;
UINT32 i = 0;
if (!EcIsLocked(sc))
device_printf(sc->ec_dev, "EcWaitEvent called without EC lock!\n");
/*
* 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.
*/
AcpiOsSleepUsec(1);
EcStatus = EC_GET_CSR(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_GET_CSR(sc);
if ((Event == EC_EVENT_OUTPUT_BUFFER_FULL) &&
(EcStatus & EC_FLAG_OUTPUT_BUFFER))
return(AE_OK);
if ((Event == EC_EVENT_INPUT_BUFFER_EMPTY) &&
!(EcStatus & EC_FLAG_INPUT_BUFFER))
return(AE_OK);
AcpiOsSleepUsec(100);
}
return(AE_ERROR);
}
static ACPI_STATUS
EcQuery(struct acpi_ec_softc *sc, UINT8 *Data)
{
ACPI_STATUS Status;
if ((Status = EcLock(sc)) != AE_OK)
return(Status);
EC_SET_CSR(sc, EC_COMMAND_QUERY);
Status = EcWaitEvent(sc, EC_EVENT_OUTPUT_BUFFER_FULL);
if (Status == AE_OK)
*Data = EC_GET_DATA(sc);
EcUnlock(sc);
if (Status != AE_OK)
device_printf(sc->ec_dev, "timeout waiting for EC to respond to EC_COMMAND_QUERY\n");
return(Status);
}
static ACPI_STATUS
EcTransaction(struct acpi_ec_softc *sc, EC_REQUEST *EcRequest)
{
ACPI_STATUS Status;
/*
* Lock the EC
*/
if ((Status = EcLock(sc)) != AE_OK)
return(Status);
/*
* Disable EC GPE:
* ---------------
* Disable EC interrupts (GPEs) from occuring during this transaction.
* This is done here as EcTransaction() is also called by the EC GPE
* handler -- where disabling/re-enabling the EC GPE is automatically
* handled by the ACPI Core Subsystem.
*/
if (AcpiDisableEvent(sc->ec_gpebit, ACPI_EVENT_GPE) != AE_OK)
device_printf(sc->ec_dev, "EcRequest: Unable to disable the EC GPE.\n");
/*
* 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 (AcpiClearEvent(sc->ec_gpebit, ACPI_EVENT_GPE) != AE_OK)
device_printf(sc->ec_dev, "EcRequest: Unable to clear the EC GPE.\n");
if (AcpiEnableEvent(sc->ec_gpebit, ACPI_EVENT_GPE) != AE_OK)
device_printf(sc->ec_dev, "EcRequest: Unable to re-enable the EC GPE.\n");
/*
* Unlock the EC
*/
EcUnlock(sc);
return(Status);
}
static ACPI_STATUS
EcRead(struct acpi_ec_softc *sc, UINT8 Address, UINT8 *Data)
{
ACPI_STATUS Status;
if (!EcIsLocked(sc))
device_printf(sc->ec_dev, "EcRead called without EC lock!\n");
/*EcBurstEnable(EmbeddedController);*/
EC_SET_CSR(sc, EC_COMMAND_READ);
if ((Status = EcWaitEvent(sc, EC_EVENT_INPUT_BUFFER_EMPTY)) != AE_OK) {
device_printf(sc->ec_dev, "EcRead: Failed waiting for EC to process read command.\n");
return(Status);
}
EC_SET_DATA(sc, Address);
if ((Status = EcWaitEvent(sc, EC_EVENT_OUTPUT_BUFFER_FULL)) != AE_OK) {
device_printf(sc->ec_dev, "EcRead: Failed waiting for EC to send data.\n");
return(Status);
}
(*Data) = EC_GET_DATA(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))
device_printf(sc->ec_dev, "EcWrite called without EC lock!\n");
/*EcBurstEnable(EmbeddedController);*/
EC_SET_CSR(sc, EC_COMMAND_WRITE);
if ((Status = EcWaitEvent(sc, EC_EVENT_INPUT_BUFFER_EMPTY)) != AE_OK) {
device_printf(sc->ec_dev, "EcWrite: Failed waiting for EC to process write command.\n");
return(Status);
}
EC_SET_DATA(sc, Address);
if ((Status = EcWaitEvent(sc, EC_EVENT_INPUT_BUFFER_EMPTY)) != AE_OK) {
device_printf(sc->ec_dev, "EcRead: Failed waiting for EC to process address.\n");
return(Status);
}
EC_SET_DATA(sc, *Data);
if ((Status = EcWaitEvent(sc, EC_EVENT_INPUT_BUFFER_EMPTY)) != AE_OK) {
device_printf(sc->ec_dev, "EcWrite: Failed waiting for EC to process data.\n");
return(Status);
}
/*EcBurstDisable(EmbeddedController);*/
return(AE_OK);
}