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freebsd-dev/sys/dev/acpica/acpi_ec.c

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/*-
* Copyright (c) 2003 Nate Lawson
* 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>
/*
* Hooks for the ACPI CA debugging infrastructure
*/
#define _COMPONENT ACPI_EC
ACPI_MODULE_NAME("EC")
/*
* EC_COMMAND:
* -----------
*/
typedef UINT8 EC_COMMAND;
#define EC_COMMAND_UNKNOWN ((EC_COMMAND) 0x00)
#define EC_COMMAND_READ ((EC_COMMAND) 0x80)
#define EC_COMMAND_WRITE ((EC_COMMAND) 0x81)
#define EC_COMMAND_BURST_ENABLE ((EC_COMMAND) 0x82)
#define EC_COMMAND_BURST_DISABLE ((EC_COMMAND) 0x83)
#define EC_COMMAND_QUERY ((EC_COMMAND) 0x84)
/*
* EC_STATUS:
* ----------
* The encoding of the EC status register is illustrated below.
* Note that a set bit (1) indicates the property is TRUE
* (e.g. if bit 0 is set then the output buffer is full).
* +-+-+-+-+-+-+-+-+
* |7|6|5|4|3|2|1|0|
* +-+-+-+-+-+-+-+-+
* | | | | | | | |
* | | | | | | | +- Output Buffer Full?
* | | | | | | +--- Input Buffer Full?
* | | | | | +----- <reserved>
* | | | | +------- Data Register is Command Byte?
* | | | +--------- Burst Mode Enabled?
* | | +----------- SCI Event?
* | +------------- SMI Event?
* +--------------- <Reserved>
*
*/
typedef UINT8 EC_STATUS;
#define EC_FLAG_OUTPUT_BUFFER ((EC_STATUS) 0x01)
#define EC_FLAG_INPUT_BUFFER ((EC_STATUS) 0x02)
#define EC_FLAG_BURST_MODE ((EC_STATUS) 0x10)
#define EC_FLAG_SCI ((EC_STATUS) 0x20)
/*
* EC_EVENT:
* ---------
*/
typedef UINT8 EC_EVENT;
#define EC_EVENT_UNKNOWN ((EC_EVENT) 0x00)
#define EC_EVENT_OUTPUT_BUFFER_FULL ((EC_EVENT) 0x01)
#define EC_EVENT_INPUT_BUFFER_EMPTY ((EC_EVENT) 0x02)
#define EC_EVENT_SCI ((EC_EVENT) 0x20)
/*
* Register access primitives
*/
#define EC_GET_DATA(sc) \
bus_space_read_1((sc)->ec_data_tag, (sc)->ec_data_handle, 0)
#define EC_SET_DATA(sc, v) \
bus_space_write_1((sc)->ec_data_tag, (sc)->ec_data_handle, 0, (v))
#define EC_GET_CSR(sc) \
bus_space_read_1((sc)->ec_csr_tag, (sc)->ec_csr_handle, 0)
#define EC_SET_CSR(sc, v) \
bus_space_write_1((sc)->ec_csr_tag, (sc)->ec_csr_handle, 0, (v))
/* Embedded Controller Boot Resources Table (ECDT) */
typedef struct {
ACPI_TABLE_HEADER header;
ACPI_GENERIC_ADDRESS control;
ACPI_GENERIC_ADDRESS data;
UINT32 uid;
UINT8 gpe_bit;
char ec_id[0];
} ACPI_TABLE_ECDT;
/* Indicate that this device has already been probed via ECDT. */
#define DEV_ECDT(x) (acpi_get_private(x) == &acpi_ec_devclass)
/* Indicate that this device should use the global lock. */
#define DEV_GLK_FLAG 0x40000000
/* Get/set GPE bit value in the magic ivar. */
#define DEV_GET_GPEBIT(x) ((x) & 0xff)
#define DEV_SET_GPEBIT(x, y) ((x) = ((x) & ~0xff) | ((y) & 0xff))
/*
* Driver softc.
*/
struct acpi_ec_softc {
device_t ec_dev;
ACPI_HANDLE ec_handle;
UINT8 ec_gpebit;
UINT8 ec_csrvalue;
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_glk;
int ec_glkhandle;
struct mtx ec_mtx;
int ec_polldelay;
};
/*
* XXX
* I couldn't find it in the spec but other implementations also use a
* value of 1 ms for the time to acquire global lock.
*/
#define EC_LOCK_TIMEOUT 1000
/*
* Start with an interval of 1 us for status poll loop. This delay
* will be dynamically adjusted based on the actual time waited.
*/
#define EC_POLL_DELAY 1
/* Total time in ms spent in the poll loop waiting for a response. */
#define EC_POLL_TIMEOUT 50
#define EVENT_READY(event, status) \
(((event) == EC_EVENT_OUTPUT_BUFFER_FULL && \
((status) & EC_FLAG_OUTPUT_BUFFER) != 0) || \
((event) == EC_EVENT_INPUT_BUFFER_EMPTY && \
((status) & EC_FLAG_INPUT_BUFFER) == 0))
static int ec_poll_timeout = EC_POLL_TIMEOUT;
TUNABLE_INT("hw.acpi.ec.poll_timeout", &ec_poll_timeout);
static __inline ACPI_STATUS
EcLock(struct acpi_ec_softc *sc)
{
ACPI_STATUS status = AE_OK;
/* Always acquire this EC's mutex. */
mtx_lock(&sc->ec_mtx);
/* If _GLK is non-zero, also acquire the global lock. */
if (sc->ec_glk) {
status = AcpiAcquireGlobalLock(EC_LOCK_TIMEOUT, &sc->ec_glkhandle);
if (ACPI_FAILURE(status))
mtx_unlock(&sc->ec_mtx);
}
return (status);
}
static __inline void
EcUnlock(struct acpi_ec_softc *sc)
{
if (sc->ec_glk)
AcpiReleaseGlobalLock(sc->ec_glkhandle);
mtx_unlock(&sc->ec_mtx);
}
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 EcCommand(struct acpi_ec_softc *sc, EC_COMMAND cmd);
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 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_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),
};
static devclass_t acpi_ec_devclass;
DRIVER_MODULE(acpi_ec, acpi, acpi_ec_driver, acpi_ec_devclass, 0, 0);
/*
* Look for an ECDT and if we find one, set up default GPE and
* space handlers to catch attempts to access EC space before
* we have a real driver instance in place.
* TODO: if people report invalid ECDTs, add a tunable to disable them.
*/
void
acpi_ec_ecdt_probe(device_t parent)
{
ACPI_TABLE_ECDT *ecdt;
ACPI_STATUS status;
device_t child;
ACPI_HANDLE h;
int magic;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
/* Find and validate the ECDT. */
status = AcpiGetFirmwareTable("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
(ACPI_TABLE_HEADER **)&ecdt);
if (ACPI_FAILURE(status) ||
ecdt->control.RegisterBitWidth != 8 ||
ecdt->data.RegisterBitWidth != 8) {
return;
}
/* Create the child device with the given unit number. */
child = BUS_ADD_CHILD(parent, 0, "acpi_ec", ecdt->uid);
if (child == NULL) {
printf("acpi_ec_ecdt_probe: can't add child\n");
return;
}
/* Find and save the ACPI handle for this device. */
status = AcpiGetHandle(NULL, ecdt->ec_id, &h);
if (ACPI_FAILURE(status)) {
device_delete_child(parent, child);
printf("acpi_ec_ecdt_probe: can't get handle\n");
return;
}
acpi_set_handle(child, h);
/* Set the data and CSR register addresses. */
bus_set_resource(child, SYS_RES_IOPORT, 0, ecdt->data.Address,
/*count*/1);
bus_set_resource(child, SYS_RES_IOPORT, 1, ecdt->control.Address,
/*count*/1);
/*
* Store values for the probe/attach routines to use. Store the
* ECDT GPE bit and set the global lock flag (just to be safe).
* We'll determine whether we really want to use the global lock
* in a later call to attach.
*/
acpi_set_private(child, &acpi_ec_devclass);
magic = DEV_GLK_FLAG;
DEV_SET_GPEBIT(magic, ecdt->gpe_bit);
acpi_set_magic(child, magic);
/* Finish the attach process. */
if (device_probe_and_attach(child) != 0)
device_delete_child(parent, child);
}
static int
acpi_ec_probe(device_t dev)
{
ACPI_HANDLE h;
ACPI_STATUS status;
device_t peer;
char desc[64];
int magic, uid, glk, gpebit, ret = ENXIO;
/* Check that this is a device and that EC is not disabled. */
if (acpi_get_type(dev) != ACPI_TYPE_DEVICE || acpi_disabled("ec"))
return (ENXIO);
/*
* If probed via ECDT, set description and continue. Otherwise,
* we can access the namespace and make sure this is not a
* duplicate probe.
*/
magic = acpi_get_magic(dev);
if (DEV_ECDT(dev)) {
snprintf(desc, sizeof(desc), "embedded controller: ECDT, GPE %#x, GLK",
DEV_GET_GPEBIT(magic));
device_set_desc_copy(dev, desc);
ret = 0;
} else if (acpi_MatchHid(dev, "PNP0C09")) {
h = acpi_get_handle(dev);
/*
* Read the unit ID to check for duplicate attach and the
* global lock value to see if we should acquire it when
* accessing the EC.
*/
status = acpi_EvaluateInteger(h, "_UID", &uid);
if (ACPI_FAILURE(status))
uid = 0;
status = acpi_EvaluateInteger(h, "_GLK", &glk);
if (ACPI_FAILURE(status))
glk = 0;
/*
* Evaluate the _GPE method to find the GPE bit used by the EC to
* signal status (SCI). Note that we don't handle the case where
* it can return a package instead of an int.
*/
status = acpi_EvaluateInteger(h, "_GPE", &gpebit);
if (ACPI_FAILURE(status)) {
device_printf(dev, "can't evaluate _GPE - %s\n",
AcpiFormatException(status));
return (ENXIO);
}
/* Store the values we got from the namespace for attach. */
magic = glk != 0 ? DEV_GLK_FLAG : 0;
DEV_SET_GPEBIT(magic, gpebit);
acpi_set_magic(dev, magic);
/*
* Check for a duplicate probe. This can happen when a probe
* via ECDT succeeded already. If there is a duplicate, override
* its value for GLK in the peer's softc since the ECDT case
* always enables the global lock to be safe. Otherwise, just
* continue on to attach.
*/
peer = devclass_get_device(acpi_ec_devclass, uid);
if (peer == NULL || !device_is_alive(peer)) {
snprintf(desc, sizeof(desc), "embedded controller: GPE %#x%s",
gpebit, glk != 0 ? ", GLK" : "");
device_set_desc_copy(dev, desc);
ret = 0;
} else {
struct acpi_ec_softc *sc;
/*
* Set the peer's sc->ec_glk with locks held so we won't
* override it between another thread's lock/unlock calls.
*/
sc = device_get_softc(peer);
if (sc->ec_glk != glk) {
ACPI_VPRINT(peer, acpi_device_get_parent_softc(peer),
"Changing GLK from %d to %d\n", sc->ec_glk, glk);
mtx_lock(&sc->ec_mtx);
sc->ec_glk = glk != 0 ? 1 : 0;
mtx_unlock(&sc->ec_mtx);
}
}
}
return (ret);
}
static int
acpi_ec_attach(device_t dev)
{
struct acpi_ec_softc *sc;
ACPI_STATUS Status;
int magic, errval = 0;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
/* Fetch/initialize softc (assumes softc is pre-zeroed). */
sc = device_get_softc(dev);
sc->ec_dev = dev;
sc->ec_handle = acpi_get_handle(dev);
sc->ec_polldelay = EC_POLL_DELAY;
mtx_init(&sc->ec_mtx, "ACPI embedded controller", NULL, MTX_DEF);
/* Retrieve previously probed values via device ivars. */
magic = acpi_get_magic(dev);
sc->ec_glk = (magic & DEV_GLK_FLAG) != 0 ? 1 : 0;
sc->ec_gpebit = DEV_GET_GPEBIT(magic);
/* Attach bus resources for data and command/status ports. */
sc->ec_data_rid = 0;
sc->ec_data_res = bus_alloc_resource(sc->ec_dev, SYS_RES_IOPORT,
&sc->ec_data_rid, 0, ~0, 1, RF_ACTIVE);
if (sc->ec_data_res == NULL) {
device_printf(dev, "can't allocate data port\n");
errval = ENXIO;
goto out;
}
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;
sc->ec_csr_res = bus_alloc_resource(sc->ec_dev, SYS_RES_IOPORT,
&sc->ec_csr_rid, 0, ~0, 1, RF_ACTIVE);
if (sc->ec_csr_res == NULL) {
device_printf(dev, "can't allocate command/status port\n");
errval = ENXIO;
goto out;
}
sc->ec_csr_tag = rman_get_bustag(sc->ec_csr_res);
sc->ec_csr_handle = rman_get_bushandle(sc->ec_csr_res);
/*
* Install a handler for this EC's GPE bit. We want edge-triggered
* behavior.
*/
ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "attaching GPE handler\n"));
Status = AcpiInstallGpeHandler(NULL, sc->ec_gpebit,
ACPI_EVENT_EDGE_TRIGGERED, &EcGpeHandler, sc);
if (ACPI_FAILURE(Status)) {
device_printf(dev, "can't install GPE handler for %s - %s\n",
acpi_name(sc->ec_handle), AcpiFormatException(Status));
errval = ENXIO;
goto out;
}
/*
* Install address space handler
*/
ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "attaching address space handler\n"));
Status = AcpiInstallAddressSpaceHandler(sc->ec_handle, ACPI_ADR_SPACE_EC,
&EcSpaceHandler, &EcSpaceSetup, sc);
if (ACPI_FAILURE(Status)) {
device_printf(dev, "can't install address space handler for %s - %s\n",
acpi_name(sc->ec_handle), AcpiFormatException(Status));
Status = AcpiRemoveGpeHandler(NULL, sc->ec_gpebit, &EcGpeHandler);
if (ACPI_FAILURE(Status))
panic("Added GPE handler but can't remove it");
errval = ENXIO;
goto out;
}
ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "acpi_ec_attach complete\n"));
return (0);
out:
if (sc->ec_csr_res)
bus_release_resource(sc->ec_dev, SYS_RES_IOPORT, sc->ec_csr_rid,
sc->ec_csr_res);
if (sc->ec_data_res)
bus_release_resource(sc->ec_dev, SYS_RES_IOPORT, sc->ec_data_rid,
sc->ec_data_res);
mtx_destroy(&sc->ec_mtx);
return (errval);
}
static void
EcGpeQueryHandler(void *Context)
{
struct acpi_ec_softc *sc = (struct acpi_ec_softc *)Context;
UINT8 Data;
ACPI_STATUS Status;
EC_STATUS EcStatus;
char qxx[5];
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
KASSERT(Context != NULL, ("EcGpeQueryHandler called with NULL"));
Status = EcLock(sc);
if (ACPI_FAILURE(Status)) {
ACPI_VPRINT(sc->ec_dev, acpi_device_get_parent_softc(sc->ec_dev),
"GpeQuery lock error: %s\n", AcpiFormatException(Status));
return;
}
/*
* If the EC_SCI bit of the status register is not set, then pass
* it along to any potential waiters as it may be an IBE/OBF event.
*/
EcStatus = EC_GET_CSR(sc);
if ((EcStatus & EC_EVENT_SCI) == 0) {
sc->ec_csrvalue = EcStatus;
wakeup(&sc->ec_csrvalue);
EcUnlock(sc);
goto re_enable;
}
/*
* Send a query command to the EC to find out which _Qxx call it
* wants to make. This command clears the SCI bit and also the
* interrupt source since we are edge-triggered.
*/
Status = EcCommand(sc, EC_COMMAND_QUERY);
if (ACPI_FAILURE(Status)) {
EcUnlock(sc);
ACPI_VPRINT(sc->ec_dev, acpi_device_get_parent_softc(sc->ec_dev),
"GPE query failed - %s\n", AcpiFormatException(Status));
goto re_enable;
}
Data = EC_GET_DATA(sc);
EcUnlock(sc);
/* Ignore the value for "no outstanding event". (13.3.5) */
if (Data == 0)
goto re_enable;
/* Evaluate _Qxx to respond to the controller. */
sprintf(qxx, "_Q%02x", Data);
strupr(qxx);
Status = AcpiEvaluateObject(sc->ec_handle, qxx, NULL, NULL);
if (ACPI_FAILURE(Status) && Status != AE_NOT_FOUND) {
ACPI_VPRINT(sc->ec_dev, acpi_device_get_parent_softc(sc->ec_dev),
"evaluation of GPE query method %s failed - %s\n",
qxx, AcpiFormatException(Status));
}
re_enable:
/* Re-enable the GPE event so we'll get future requests. */
Status = AcpiEnableGpe(NULL, sc->ec_gpebit, ACPI_NOT_ISR);
if (ACPI_FAILURE(Status))
printf("EcGpeQueryHandler: AcpiEnableEvent failed\n");
}
/*
* Handle a GPE. Currently we only handle SCI events as others must
* be handled by polling in EcWaitEvent(). This is because some ECs
* treat events as level when they should be edge-triggered.
*/
static void
EcGpeHandler(void *Context)
{
struct acpi_ec_softc *sc = Context;
ACPI_STATUS Status;
KASSERT(Context != NULL, ("EcGpeHandler called with NULL"));
/* Disable further GPEs while we handle this one. */
AcpiDisableGpe(NULL, sc->ec_gpebit, ACPI_ISR);
/* Schedule the GPE query handler. */
Status = AcpiOsQueueForExecution(OSD_PRIORITY_GPE, EcGpeQueryHandler,
Context);
if (ACPI_FAILURE(Status)) {
printf("Queuing GPE query handler failed.\n");
Status = AcpiEnableGpe(NULL, sc->ec_gpebit, ACPI_ISR);
if (ACPI_FAILURE(Status))
printf("EcGpeHandler: AcpiEnableEvent failed\n");
}
}
static ACPI_STATUS
EcSpaceSetup(ACPI_HANDLE Region, UINT32 Function, void *Context,
void **RegionContext)
{
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
/*
* 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 = (struct acpi_ec_softc *)Context;
ACPI_STATUS Status = AE_OK;
UINT8 EcAddr, EcData;
int i;
ACPI_FUNCTION_TRACE_U32((char *)(uintptr_t)__func__, (UINT32)Address);
if (Address > 0xFF || width % 8 != 0 || Value == NULL || Context == NULL)
return_ACPI_STATUS (AE_BAD_PARAMETER);
/*
* Perform the transaction.
*/
EcAddr = Address;
for (i = 0; i < width; i += 8) {
Status = EcLock(sc);
if (ACPI_FAILURE(Status))
return (Status);
switch (Function) {
case ACPI_READ:
EcData = 0;
Status = EcRead(sc, EcAddr, &EcData);
break;
case ACPI_WRITE:
EcData = (UINT8)((*Value) >> i);
Status = EcWrite(sc, EcAddr, &EcData);
break;
default:
device_printf(sc->ec_dev, "invalid EcSpaceHandler function %d\n",
Function);
Status = AE_BAD_PARAMETER;
break;
}
EcUnlock(sc);
if (ACPI_FAILURE(Status))
return (Status);
*Value |= (ACPI_INTEGER)EcData << i;
if (++EcAddr == 0)
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
return_ACPI_STATUS (Status);
}
static ACPI_STATUS
EcWaitEvent(struct acpi_ec_softc *sc, EC_EVENT Event)
{
EC_STATUS EcStatus;
ACPI_STATUS Status;
int i, period, retval;
static int EcDbgMaxDelay;
mtx_assert(&sc->ec_mtx, MA_OWNED);
Status = AE_NO_HARDWARE_RESPONSE;
/*
* Wait for 1 us before checking the CSR. Testing shows about
* 50% of requests complete in 1 us and 90% of them complete
* in 5 us or less.
*/
AcpiOsStall(1);
/*
* Poll the EC status register to detect completion of the last
* command. First, wait up to 1 ms in chunks of sc->ec_polldelay
* microseconds.
*/
for (i = 0; i < 1000 / sc->ec_polldelay; i++) {
EcStatus = EC_GET_CSR(sc);
if (EVENT_READY(Event, EcStatus)) {
Status = AE_OK;
break;
}
AcpiOsStall(sc->ec_polldelay);
}
/* Scale poll delay by the amount of time actually waited. */
period = i * sc->ec_polldelay;
if (period <= 5)
sc->ec_polldelay = 1;
else if (period <= 20)
sc->ec_polldelay = 5;
else if (period <= 100)
sc->ec_polldelay = 10;
else
sc->ec_polldelay = 100;
/*
* If we still don't have a response, wait up to ec_poll_timeout ms
* for completion, sleeping for chunks of 10 ms.
*/
if (Status != AE_OK) {
retval = -1;
for (i = 0; i < ec_poll_timeout / 10; i++) {
if (retval != 0)
EcStatus = EC_GET_CSR(sc);
else
EcStatus = sc->ec_csrvalue;
if (EVENT_READY(Event, EcStatus)) {
Status = AE_OK;
break;
}
retval = msleep(&sc->ec_csrvalue, &sc->ec_mtx, PZERO, "ecpoll",
10/*ms*/);
}
}
/* Calculate new delay and print it if it exceeds the max. */
if (period == 1000)
period += i * 10000;
if (period > EcDbgMaxDelay) {
EcDbgMaxDelay = period;
ACPI_VPRINT(sc->ec_dev, acpi_device_get_parent_softc(sc->ec_dev),
"info: new max delay is %d us\n", period);
}
return (Status);
}
static ACPI_STATUS
EcCommand(struct acpi_ec_softc *sc, EC_COMMAND cmd)
{
ACPI_STATUS Status;
EC_EVENT Event;
mtx_assert(&sc->ec_mtx, MA_OWNED);
/* Decide what to wait for based on command type. */
switch (cmd) {
case EC_COMMAND_READ:
case EC_COMMAND_WRITE:
case EC_COMMAND_BURST_DISABLE:
Event = EC_EVENT_INPUT_BUFFER_EMPTY;
break;
case EC_COMMAND_QUERY:
case EC_COMMAND_BURST_ENABLE:
Event = EC_EVENT_OUTPUT_BUFFER_FULL;
break;
default:
ACPI_VPRINT(sc->ec_dev, acpi_device_get_parent_softc(sc->ec_dev),
"EcCommand: Invalid command %#x\n", cmd);
return (AE_BAD_PARAMETER);
}
/* Run the command and wait for the chosen event. */
EC_SET_CSR(sc, cmd);
Status = EcWaitEvent(sc, Event);
if (ACPI_FAILURE(Status)) {
ACPI_VPRINT(sc->ec_dev, acpi_device_get_parent_softc(sc->ec_dev),
"EcCommand: no response to %#x\n", cmd);
}
return (Status);
}
static ACPI_STATUS
EcRead(struct acpi_ec_softc *sc, UINT8 Address, UINT8 *Data)
{
ACPI_STATUS Status;
mtx_assert(&sc->ec_mtx, MA_OWNED);
#ifdef notyet
/* If we can't start burst mode, continue anyway. */
EcCommand(sc, EC_COMMAND_BURST_ENABLE);
#endif
Status = EcCommand(sc, EC_COMMAND_READ);
if (ACPI_FAILURE(Status))
return (Status);
EC_SET_DATA(sc, Address);
Status = EcWaitEvent(sc, EC_EVENT_OUTPUT_BUFFER_FULL);
if (ACPI_FAILURE(Status)) {
ACPI_VPRINT(sc->ec_dev, acpi_device_get_parent_softc(sc->ec_dev),
"EcRead: Failed waiting for EC to send data.\n");
return (Status);
}
*Data = EC_GET_DATA(sc);
#ifdef notyet
if (sc->ec_burstactive) {
Status = EcCommand(sc, EC_COMMAND_BURST_DISABLE);
if (ACPI_FAILURE(Status))
return (Status);
}
#endif
return (AE_OK);
}
static ACPI_STATUS
EcWrite(struct acpi_ec_softc *sc, UINT8 Address, UINT8 *Data)
{
ACPI_STATUS Status;
mtx_assert(&sc->ec_mtx, MA_OWNED);
#ifdef notyet
/* If we can't start burst mode, continue anyway. */
EcCommand(sc, EC_COMMAND_BURST_ENABLE);
#endif
Status = EcCommand(sc, EC_COMMAND_WRITE);
if (ACPI_FAILURE(Status))
return (Status);
EC_SET_DATA(sc, Address);
Status = EcWaitEvent(sc, EC_EVENT_INPUT_BUFFER_EMPTY);
if (ACPI_FAILURE(Status)) {
ACPI_VPRINT(sc->ec_dev, acpi_device_get_parent_softc(sc->ec_dev),
"EcRead: Failed waiting for EC to process address\n");
return (Status);
}
EC_SET_DATA(sc, *Data);
Status = EcWaitEvent(sc, EC_EVENT_INPUT_BUFFER_EMPTY);
if (ACPI_FAILURE(Status)) {
ACPI_VPRINT(sc->ec_dev, acpi_device_get_parent_softc(sc->ec_dev),
"EcWrite: Failed waiting for EC to process data\n");
return (Status);
}
#ifdef notyet
if (sc->ec_burstactive) {
Status = EcCommand(sc, EC_COMMAND_BURST_DISABLE);
if (ACPI_FAILURE(Status))
return (Status);
}
#endif
return (AE_OK);
}
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