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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (C) 2008 Advanced Micro Devices, Inc.
* Copyright (C) 2016 Bin Meng <bmeng.cn@gmail.com>
*
* Modified from coreboot src/arch/x86/acpi/debug.asl
*/
/* POST register region */
OperationRegion(X80, SystemIO, 0x80, 1)
Field(X80, ByteAcc, NoLock, Preserve)
{
P80, 8
}
/* Legacy serial port register region */
OperationRegion(CREG, SystemIO, 0x3F8, 8)
Field(CREG, ByteAcc, NoLock, Preserve)
{
CDAT, 8,
CDLM, 8,
, 8,
CLCR, 8,
CMCR, 8,
CLSR, 8
}
/* DINI - Initialize the serial port to 115200 8-N-1 */
Method(DINI)
{
Store(0x83, CLCR)
Store(0x01, CDAT) /* 115200 baud (low) */
Store(0x00, CDLM) /* 115200 baud (high) */
Store(0x03, CLCR) /* word=8 stop=1 parity=none */
Store(0x03, CMCR) /* DTR=1 RTS=1 out1/2=Off loop=Off */
Store(0x00, CDLM) /* turn off interrupts */
}
/* THRE - Wait for serial port transmitter holding register to go empty */
Method(THRE)
{
And(CLSR, 0x20, Local0)
While (LEqual(Local0, Zero)) {
And(CLSR, 0x20, Local0)
}
}
/* OUTX - Send a single raw character */
Method(OUTX, 1)
{
THRE()
Store(Arg0, CDAT)
}
/* OUTC - Send a single character, expanding LF into CR/LF */
Method(OUTC, 1)
{
If (LEqual(Arg0, 0x0a)) {
OUTX(0x0d)
}
OUTX(Arg0)
}
/* DBGN - Send a single hex nibble */
Method(DBGN, 1)
{
And(Arg0, 0x0f, Local0)
If (LLess(Local0, 10)) {
Add(Local0, 0x30, Local0)
} Else {
Add(Local0, 0x37, Local0)
}
OUTC(Local0)
}
/* DBGB - Send a hex byte */
Method(DBGB, 1)
{
ShiftRight(Arg0, 4, Local0)
DBGN(Local0)
DBGN(Arg0)
}
/* DBGW - Send a hex word */
Method(DBGW, 1)
{
ShiftRight(Arg0, 8, Local0)
DBGB(Local0)
DBGB(Arg0)
}
/* DBGD - Send a hex dword */
Method(DBGD, 1)
{
ShiftRight(Arg0, 16, Local0)
DBGW(Local0)
DBGW(Arg0)
}
/* Get a char from a string */
Method(GETC, 2)
{
CreateByteField(Arg0, Arg1, DBGC)
Return (DBGC)
}
/* DBGO - Send either a string or an integer */
Method(DBGO, 1, Serialized)
{
If (LEqual(ObjectType(Arg0), 1)) {
If (LGreater(Arg0, 0xffff)) {
DBGD(Arg0)
} Else {
If (LGreater(Arg0, 0xff)) {
DBGW(Arg0)
} Else {
DBGB(Arg0)
}
}
} Else {
Name(BDBG, Buffer(80) {})
Store(Arg0, BDBG)
Store(0, Local1)
While (One) {
Store(GETC(BDBG, Local1), Local0)
If (LEqual(Local0, 0)) {
Return (Zero)
}
OUTC(Local0)
Increment(Local1)
}
}
Return (Zero)
}
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