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/*
* kgdb debug routines for SiByte boards.
*
* 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/io.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/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 --------------------- */
extern int kgdb_port;
#define duart_out(reg, val) csr_out32(val, IOADDR(A_DUART_CHANREG(kgdb_port,reg)))
#define duart_in(reg) csr_in32(IOADDR(A_DUART_CHANREG(kgdb_port,reg)))
void putDebugChar(unsigned char c);
unsigned char getDebugChar(void);
static void
duart_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 */
}
void
putDebugChar(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 char
getDebugChar(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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