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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
/*
* ACPI style embedded controller commands
*
* Controlled by the following preprocessor defines:
* EC_SC_IO I/o address of the EC_SC register
* EC_DATA_IO I/o address of the EC_DATA register
*/
#define EC_MUTEX ECMX
#define WAIT_EC_SC WECC
#define SEND_EC_COMMAND SECC
#define SEND_EC_DATA SECD
#define RECV_EC_DATA RECD
#define EC_READ ECRD
#define EC_WRITE ECWR
#define EC_SC ECSC
#define EC_DATA ECDT
#define EC_OBF 0x01 /* Output buffer full (EC_DATA) */
#define EC_IBF 0x02 /* Input buffer full (EC_DATA or EC_SC) */
#define EC_ERROR_MASK 0xff00
#define EC_TIMEOUT 0x8000
#define EC_READ_CMD 0x80
#define EC_WRITE_CMD 0x81
Mutex(EC_MUTEX, 1)
OperationRegion(ERSC, SystemIO, EC_SC_IO, 1)
Field(ERSC, ByteAcc, NoLock, Preserve) { EC_SC, 8 }
OperationRegion(ERDT, SystemIO, EC_DATA_IO, 1)
Field(ERDT, ByteAcc, NoLock, Preserve) { EC_DATA, 8 }
/*
* Wait for a bit in the status and command (EC_SC) register
*
* The caller is responsible of acquiring the EC_MUTEX before
* calling this method.
*
* Arg0: Mask, Arg1: State waiting for
* Returns EC_TIMEOUT if timed out, 0 else
*/
Method (WAIT_EC_SC, 2)
{
Store (0x7ff, Local0) /* Timeout */
While (LAnd (LNotEqual (And (EC_SC, Arg0), Arg1), Decrement (Local0))) {
Stall (10)
}
If (Local0) {
Return (0)
} Else {
Return (EC_TIMEOUT)
}
}
/*
* Send command byte in Arg0 to status and command (EC_SC) register
*
* The caller is responsible of acquiring the EC_MUTEX before
* calling this method.
*
* Returns EC_TIMEOUT if timed out, 0 else
*/
Method (SEND_EC_COMMAND, 1)
{
Store (WAIT_EC_SC (EC_IBF, 0), Local0)
If (LNot (Local0)) {
Store (Arg0, EC_SC)
}
Return (Local0)
}
/*
* Send data byte in Arg0 to data (EC_DATA) register
*
* The caller is responsible of acquiring the EC_MUTEX before
* calling this method.
*
* Returns EC_TIMEOUT if timed out, 0 else
*/
Method (SEND_EC_DATA, 1)
{
Store (WAIT_EC_SC (EC_IBF, 0), Local0)
If (LNot (Local0)) {
Store (Arg0, EC_DATA)
}
Return (Local0)
}
/*
* Read one byte of data from data (EC_DATA) register
*
* The caller is responsible of acquiring the EC_MUTEX before
* calling this method.
*
* Returns EC_TIMEOUT if timed out, the read data byte else
*/
Method (RECV_EC_DATA)
{
Store (WAIT_EC_SC (EC_OBF, EC_OBF), Local0)
If (LNot (Local0)) {
Return (EC_DATA)
} Else {
Return (Local0)
}
}
/*
* Read one byte from ec memory (cmd 0x80)
*
* Arg0: Address (1 byte) to read from
* Returns EC_TIMEOUT if timed out, the read data byte else
*/
Method (EC_READ, 1)
{
Acquire (EC_MUTEX, 0xffff)
Store (SEND_EC_COMMAND (EC_READ_CMD), Local0)
If (LNot (Local0)) {
Store (SEND_EC_DATA (Arg0), Local0)
}
If (LNot (Local0)) {
Store (RECV_EC_DATA (), Local0)
}
Release (EC_MUTEX)
Return (Local0)
}
/*
* Write one byte to ec memory (cmd 0x81)
*
* Arg0: Address (1 byte) to write to
* Arg1: Byte to write
* Returns EC_TIMEOUT if timed out, 0 else
*/
Method (EC_WRITE, 2)
{
Acquire (EC_MUTEX, 0xffff)
Store (SEND_EC_COMMAND (EC_WRITE_CMD), Local0)
If (LNot (Local0)) {
Store (SEND_EC_DATA (Arg0), Local0)
}
If (LNot (Local0)) {
Store (SEND_EC_DATA (Arg1), Local0)
}
Release (EC_MUTEX)
Return (Local0)
}
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