?? dbg_io.c
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/* * kgdb debug routines for swarm board. * * Copyright (C) 2001 MontaVista Software Inc. * Author: Jun Sun, 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. * *//* -------------------- BEGINNING OF CONFIG --------------------- */#include <linux/delay.h>#include <asm/sibyte/sb1250.h>#include <asm/sibyte/sb1250_regs.h>#include <asm/sibyte/sb1250_uart.h>#include <asm/sibyte/sb1250_int.h>#include <asm/sibyte/64bit.h>#include <asm/addrspace.h>/* * We use the second serial port for kgdb traffic. * 115200, 8, N, 1. */#define BAUD_RATE 115200#define CLK_DIVISOR V_DUART_BAUD_RATE(BAUD_RATE)#define DATA_BITS V_DUART_BITS_PER_CHAR_8 /* or 7 */#define PARITY V_DUART_PARITY_MODE_NONE /* or even */#define STOP_BITS M_DUART_STOP_BIT_LEN_1 /* or 2 */static int duart_initialized = 0; /* 0: need to be init'ed by kgdb *//* -------------------- END OF CONFIG --------------------- */#define duart_out(reg, val) out64(val, KSEG1 + A_DUART_CHANREG(1,reg))#define duart_in(reg) in64(KSEG1 + A_DUART_CHANREG(1,reg))extern void set_async_breakpoint(unsigned int epc);void putDebugChar(unsigned char c);unsigned char getDebugChar(void);static voidduart_init(int clk_divisor, int data, int parity, int stop){ duart_out(R_DUART_MODE_REG_1, data | parity); duart_out(R_DUART_MODE_REG_2, stop); duart_out(R_DUART_CLK_SEL, clk_divisor); duart_out(R_DUART_CMD, M_DUART_RX_EN | M_DUART_TX_EN); /* enable rx and tx */}voidputDebugChar(unsigned char c){ if (!duart_initialized) { duart_initialized = 1; duart_init(CLK_DIVISOR, DATA_BITS, PARITY, STOP_BITS); } while ((duart_in(R_DUART_STATUS) & M_DUART_TX_RDY) == 0); duart_out(R_DUART_TX_HOLD, c);}unsigned chargetDebugChar(void){ if (!duart_initialized) { duart_initialized = 1; duart_init(CLK_DIVISOR, DATA_BITS, PARITY, STOP_BITS); } while ((duart_in(R_DUART_STATUS) & M_DUART_RX_RDY) == 0) ; return duart_in(R_DUART_RX_HOLD);}
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