137 lines
4.5 KiB
C
137 lines
4.5 KiB
C
/*
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* kgdb io functions for osprey. We use the serial port on debug board.
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*
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* Copyright (C) 2001 MontaVista Software Inc.
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* Author: jsun@mvista.com or jsun@junsun.net
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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/* ======================= CONFIG ======================== */
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/* [jsun] we use the second serial port for kdb */
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#define BASE 0xb7fffff0
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#define MAX_BAUD 115200
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/* distance in bytes between two serial registers */
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#define REG_OFFSET 1
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/*
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* 0 - kgdb does serial init
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* 1 - kgdb skip serial init
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*/
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static int remoteDebugInitialized = 1;
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/*
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* the default baud rate *if* kgdb does serial init
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*/
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#define BAUD_DEFAULT UART16550_BAUD_38400
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/* ======================= END OF CONFIG ======================== */
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typedef unsigned char uint8;
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typedef unsigned int uint32;
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#define UART16550_BAUD_2400 2400
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#define UART16550_BAUD_4800 4800
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#define UART16550_BAUD_9600 9600
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#define UART16550_BAUD_19200 19200
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#define UART16550_BAUD_38400 38400
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#define UART16550_BAUD_57600 57600
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#define UART16550_BAUD_115200 115200
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#define UART16550_PARITY_NONE 0
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#define UART16550_PARITY_ODD 0x08
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#define UART16550_PARITY_EVEN 0x18
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#define UART16550_PARITY_MARK 0x28
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#define UART16550_PARITY_SPACE 0x38
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#define UART16550_DATA_5BIT 0x0
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#define UART16550_DATA_6BIT 0x1
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#define UART16550_DATA_7BIT 0x2
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#define UART16550_DATA_8BIT 0x3
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#define UART16550_STOP_1BIT 0x0
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#define UART16550_STOP_2BIT 0x4
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/* register offset */
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#define OFS_RCV_BUFFER 0
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#define OFS_TRANS_HOLD 0
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#define OFS_SEND_BUFFER 0
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#define OFS_INTR_ENABLE (1*REG_OFFSET)
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#define OFS_INTR_ID (2*REG_OFFSET)
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#define OFS_DATA_FORMAT (3*REG_OFFSET)
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#define OFS_LINE_CONTROL (3*REG_OFFSET)
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#define OFS_MODEM_CONTROL (4*REG_OFFSET)
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#define OFS_RS232_OUTPUT (4*REG_OFFSET)
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#define OFS_LINE_STATUS (5*REG_OFFSET)
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#define OFS_MODEM_STATUS (6*REG_OFFSET)
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#define OFS_RS232_INPUT (6*REG_OFFSET)
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#define OFS_SCRATCH_PAD (7*REG_OFFSET)
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#define OFS_DIVISOR_LSB (0*REG_OFFSET)
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#define OFS_DIVISOR_MSB (1*REG_OFFSET)
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/* memory-mapped read/write of the port */
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#define UART16550_READ(y) (*((volatile uint8*)(BASE + y)))
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#define UART16550_WRITE(y, z) ((*((volatile uint8*)(BASE + y))) = z)
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void debugInit(uint32 baud, uint8 data, uint8 parity, uint8 stop)
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{
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/* disable interrupts */
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UART16550_WRITE(OFS_INTR_ENABLE, 0);
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/* set up buad rate */
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{
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uint32 divisor;
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/* set DIAB bit */
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UART16550_WRITE(OFS_LINE_CONTROL, 0x80);
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/* set divisor */
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divisor = MAX_BAUD / baud;
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UART16550_WRITE(OFS_DIVISOR_LSB, divisor & 0xff);
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UART16550_WRITE(OFS_DIVISOR_MSB, (divisor & 0xff00) >> 8);
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/* clear DIAB bit */
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UART16550_WRITE(OFS_LINE_CONTROL, 0x0);
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}
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/* set data format */
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UART16550_WRITE(OFS_DATA_FORMAT, data | parity | stop);
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}
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uint8 getDebugChar(void)
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{
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if (!remoteDebugInitialized) {
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remoteDebugInitialized = 1;
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debugInit(BAUD_DEFAULT,
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UART16550_DATA_8BIT,
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UART16550_PARITY_NONE, UART16550_STOP_1BIT);
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}
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while ((UART16550_READ(OFS_LINE_STATUS) & 0x1) == 0);
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return UART16550_READ(OFS_RCV_BUFFER);
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}
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int putDebugChar(uint8 byte)
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{
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if (!remoteDebugInitialized) {
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remoteDebugInitialized = 1;
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debugInit(BAUD_DEFAULT,
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UART16550_DATA_8BIT,
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UART16550_PARITY_NONE, UART16550_STOP_1BIT);
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}
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while ((UART16550_READ(OFS_LINE_STATUS) & 0x20) == 0);
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UART16550_WRITE(OFS_SEND_BUFFER, byte);
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return 1;
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}
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