dbg_io.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:4k
- /*
- * kgdb io functions for DDB5476. We use the second serial port.
- *
- * Copyright (C) 2001 MontaVista Software Inc.
- * Author: jsun@mvista.com or jsun@junsun.net
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
- *
- */
- /* ======================= CONFIG ======================== */
- /* [jsun] we use the second serial port for kdb */
- #define BASE 0xa60002f8
- #define MAX_BAUD 115200
- /* distance in bytes between two serial registers */
- #define REG_OFFSET 1
- /*
- * 0 - kgdb does serial init
- * 1 - kgdb skip serial init
- */
- static int remoteDebugInitialized = 0;
- /*
- * the default baud rate *if* kgdb does serial init
- */
- #define BAUD_DEFAULT UART16550_BAUD_38400
- /* ======================= END OF CONFIG ======================== */
- typedef unsigned char uint8;
- typedef unsigned int uint32;
- #define UART16550_BAUD_2400 2400
- #define UART16550_BAUD_4800 4800
- #define UART16550_BAUD_9600 9600
- #define UART16550_BAUD_19200 19200
- #define UART16550_BAUD_38400 38400
- #define UART16550_BAUD_57600 57600
- #define UART16550_BAUD_115200 115200
- #define UART16550_PARITY_NONE 0
- #define UART16550_PARITY_ODD 0x08
- #define UART16550_PARITY_EVEN 0x18
- #define UART16550_PARITY_MARK 0x28
- #define UART16550_PARITY_SPACE 0x38
- #define UART16550_DATA_5BIT 0x0
- #define UART16550_DATA_6BIT 0x1
- #define UART16550_DATA_7BIT 0x2
- #define UART16550_DATA_8BIT 0x3
- #define UART16550_STOP_1BIT 0x0
- #define UART16550_STOP_2BIT 0x4
- /* register offset */
- #define OFS_RCV_BUFFER 0
- #define OFS_TRANS_HOLD 0
- #define OFS_SEND_BUFFER 0
- #define OFS_INTR_ENABLE (1*REG_OFFSET)
- #define OFS_INTR_ID (2*REG_OFFSET)
- #define OFS_DATA_FORMAT (3*REG_OFFSET)
- #define OFS_LINE_CONTROL (3*REG_OFFSET)
- #define OFS_MODEM_CONTROL (4*REG_OFFSET)
- #define OFS_RS232_OUTPUT (4*REG_OFFSET)
- #define OFS_LINE_STATUS (5*REG_OFFSET)
- #define OFS_MODEM_STATUS (6*REG_OFFSET)
- #define OFS_RS232_INPUT (6*REG_OFFSET)
- #define OFS_SCRATCH_PAD (7*REG_OFFSET)
- #define OFS_DIVISOR_LSB (0*REG_OFFSET)
- #define OFS_DIVISOR_MSB (1*REG_OFFSET)
- /* memory-mapped read/write of the port */
- #define UART16550_READ(y) (*((volatile uint8*)(BASE + y)))
- #define UART16550_WRITE(y, z) ((*((volatile uint8*)(BASE + y))) = z)
- void debugInit(uint32 baud, uint8 data, uint8 parity, uint8 stop)
- {
- /* disable interrupts */
- UART16550_WRITE(OFS_INTR_ENABLE, 0);
- /* set up buad rate */
- {
- uint32 divisor;
- /* set DIAB bit */
- UART16550_WRITE(OFS_LINE_CONTROL, 0x80);
- /* set divisor */
- divisor = MAX_BAUD / baud;
- UART16550_WRITE(OFS_DIVISOR_LSB, divisor & 0xff);
- UART16550_WRITE(OFS_DIVISOR_MSB, (divisor & 0xff00) >> 8);
- /* clear DIAB bit */
- UART16550_WRITE(OFS_LINE_CONTROL, 0x0);
- }
- /* set data format */
- UART16550_WRITE(OFS_DATA_FORMAT, data | parity | stop);
- }
- uint8 getDebugChar(void)
- {
- if (!remoteDebugInitialized) {
- remoteDebugInitialized = 1;
- debugInit(BAUD_DEFAULT,
- UART16550_DATA_8BIT,
- UART16550_PARITY_NONE, UART16550_STOP_1BIT);
- }
- while ((UART16550_READ(OFS_LINE_STATUS) & 0x1) == 0);
- return UART16550_READ(OFS_RCV_BUFFER);
- }
- int putDebugChar(uint8 byte)
- {
- if (!remoteDebugInitialized) {
- remoteDebugInitialized = 1;
- debugInit(BAUD_DEFAULT,
- UART16550_DATA_8BIT,
- UART16550_PARITY_NONE, UART16550_STOP_1BIT);
- }
- while ((UART16550_READ(OFS_LINE_STATUS) & 0x20) == 0);
- UART16550_WRITE(OFS_SEND_BUFFER, byte);
- return 1;
- }