| /* 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) |
| } |
