1/* 2 * kgdb debug routines for SiByte boards. 3 * 4 * Copyright (C) 2001 MontaVista Software Inc. 5 * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the 9 * Free Software Foundation; either version 2 of the License, or (at your 10 * option) any later version. 11 * 12 */ 13 14/* -------------------- BEGINNING OF CONFIG --------------------- */ 15 16#include <linux/delay.h> 17#include <asm/io.h> 18#include <asm/sibyte/sb1250.h> 19#include <asm/sibyte/sb1250_regs.h> 20#include <asm/sibyte/sb1250_uart.h> 21#include <asm/sibyte/sb1250_int.h> 22#include <asm/addrspace.h> 23 24/* 25 * We use the second serial port for kgdb traffic. 26 * 115200, 8, N, 1. 27 */ 28 29#define BAUD_RATE 115200 30#define CLK_DIVISOR V_DUART_BAUD_RATE(BAUD_RATE) 31#define DATA_BITS V_DUART_BITS_PER_CHAR_8 /* or 7 */ 32#define PARITY V_DUART_PARITY_MODE_NONE /* or even */ 33#define STOP_BITS M_DUART_STOP_BIT_LEN_1 /* or 2 */ 34 35static int duart_initialized = 0; /* 0: need to be init'ed by kgdb */ 36 37/* -------------------- END OF CONFIG --------------------- */ 38extern int kgdb_port; 39 40#define duart_out(reg, val) csr_out32(val, IOADDR(A_DUART_CHANREG(kgdb_port,reg))) 41#define duart_in(reg) csr_in32(IOADDR(A_DUART_CHANREG(kgdb_port,reg))) 42 43void putDebugChar(unsigned char c); 44unsigned char getDebugChar(void); 45static void 46duart_init(int clk_divisor, int data, int parity, int stop) 47{ 48 duart_out(R_DUART_MODE_REG_1, data | parity); 49 duart_out(R_DUART_MODE_REG_2, stop); 50 duart_out(R_DUART_CLK_SEL, clk_divisor); 51 52 duart_out(R_DUART_CMD, M_DUART_RX_EN | M_DUART_TX_EN); /* enable rx and tx */ 53} 54 55void 56putDebugChar(unsigned char c) 57{ 58 if (!duart_initialized) { 59 duart_initialized = 1; 60 duart_init(CLK_DIVISOR, DATA_BITS, PARITY, STOP_BITS); 61 } 62 while ((duart_in(R_DUART_STATUS) & M_DUART_TX_RDY) == 0); 63 duart_out(R_DUART_TX_HOLD, c); 64} 65 66unsigned char 67getDebugChar(void) 68{ 69 if (!duart_initialized) { 70 duart_initialized = 1; 71 duart_init(CLK_DIVISOR, DATA_BITS, PARITY, STOP_BITS); 72 } 73 while ((duart_in(R_DUART_STATUS) & M_DUART_RX_RDY) == 0) ; 74 return duart_in(R_DUART_RX_HOLD); 75} 76