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