/* * Carsten Langgaard, carstenl@mips.com * Copyright (C) 2000 MIPS Technologies, Inc.  All rights reserved. * * ######################################################################## * *  This program is free software; you can distribute it and/or modify it *  under the terms of the GNU General Public License (Version 2) as *  published by the Free Software Foundation. * *  This program is distributed in the hope it will be useful, but WITHOUT *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License *  for more details. * *  You should have received a copy of the GNU General Public License along *  with this program; if not, write to the Free Software Foundation, Inc., *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA. * * ######################################################################## * * This is the interface to the remote debugger stub. * */#include <linux/serialP.h>#include <linux/serial_reg.h>#include <asm/serial.h>#include <asm/io.h>static struct serial_state rs_table[RS_TABLE_SIZE] = {	SERIAL_PORT_DFNS	/* Defined in serial.h */};static struct async_struct kdb_port_info = {0};static __inline__ unsigned int serial_in(struct async_struct *info, int offset){	return inb(info->port + offset);}static __inline__ void serial_out(struct async_struct *info, int offset,				int value){	outb(value, info->port+offset);}void rs_kgdb_hook(int tty_no) {	int t;	struct serial_state *ser = &rs_table[tty_no];	kdb_port_info.state = ser;	kdb_port_info.magic = SERIAL_MAGIC;	kdb_port_info.port = ser->port;	kdb_port_info.flags = ser->flags;	/*	 * Clear all interrupts	 */	serial_in(&kdb_port_info, UART_LSR);	serial_in(&kdb_port_info, UART_RX);	serial_in(&kdb_port_info, UART_IIR);	serial_in(&kdb_port_info, UART_MSR);	/*	 * Now, initialize the UART 	 */	serial_out(&kdb_port_info, UART_LCR, UART_LCR_WLEN8);	/* reset DLAB */	if (kdb_port_info.flags & ASYNC_FOURPORT) {		kdb_port_info.MCR = UART_MCR_DTR | UART_MCR_RTS;		t = UART_MCR_DTR | UART_MCR_OUT1;	} else {		kdb_port_info.MCR 			= UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2;		t = UART_MCR_DTR | UART_MCR_RTS;	}	kdb_port_info.MCR = t;		/* no interrupts, please */	serial_out(&kdb_port_info, UART_MCR, kdb_port_info.MCR);		/*	 * and set the speed of the serial port	 * (currently hardwired to 9600 8N1	 */	/* baud rate is fixed to 9600 (is this sufficient?)*/	t = kdb_port_info.state->baud_base / 9600;		/* set DLAB */	serial_out(&kdb_port_info, UART_LCR, UART_LCR_WLEN8 | UART_LCR_DLAB);	serial_out(&kdb_port_info, UART_DLL, t & 0xff);/* LS of divisor */	serial_out(&kdb_port_info, UART_DLM, t >> 8);  /* MS of divisor */	/* reset DLAB */	serial_out(&kdb_port_info, UART_LCR, UART_LCR_WLEN8);}int rs_putDebugChar(char c){	if (!kdb_port_info.state) { 	/* need to init device first */		return 0;	}	while ((serial_in(&kdb_port_info, UART_LSR) & UART_LSR_THRE) == 0)		;	serial_out(&kdb_port_info, UART_TX, c);	return 1;}char rs_getDebugChar(void){	if (!kdb_port_info.state) { 	/* need to init device first */		return 0;	}	while (!(serial_in(&kdb_port_info, UART_LSR) & 1))		;	return(serial_in(&kdb_port_info, UART_RX));}#ifdef CONFIG_MIPS_ATLAS#include <asm/mips-boards/atlas.h>#include <asm/mips-boards/saa9730_uart.h>#define INB(a)     inb((unsigned long)a)#define OUTB(x,a)  outb(x,(unsigned long)a)/* * This is the interface to the remote debugger stub * if the Philips part is used for the debug port, * called from the platform setup code. * * PCI init will not have been done yet, we make a * universal assumption about the way the bootloader (YAMON) * have located and set up the chip. */static t_uart_saa9730_regmap *kgdb_uart = (void *)(ATLAS_SAA9730_REG + SAA9730_UART_REGS_ADDR);static int saa9730_kgdb_active = 0;void saa9730_kgdb_hook(void) {        volatile unsigned char t;        /*         * Clear all interrupts         */	t = INB(&kgdb_uart->Lsr);	t += INB(&kgdb_uart->Msr);	t += INB(&kgdb_uart->Thr_Rbr);	t += INB(&kgdb_uart->Iir_Fcr);        /*         * Now, initialize the UART         */	/* 8 data bits, one stop bit, no parity */	OUTB(SAA9730_LCR_DATA8, &kgdb_uart->Lcr);        /* baud rate is fixed to 9600 (is this sufficient?)*/	OUTB(0, &kgdb_uart->BaudDivMsb); /* HACK - Assumes standard crystal */	OUTB(23, &kgdb_uart->BaudDivLsb); /* HACK - known for MIPS Atlas */	/* Set RTS/DTR active */	OUTB(SAA9730_MCR_DTR | SAA9730_MCR_RTS, &kgdb_uart->Mcr);	saa9730_kgdb_active = 1;}int saa9730_putDebugChar(char c){        if (!saa9730_kgdb_active) {     /* need to init device first */                return 0;        }        while (!(INB(&kgdb_uart->Lsr) & SAA9730_LSR_THRE))                ;	OUTB(c, &kgdb_uart->Thr_Rbr);        return 1;}char saa9730_getDebugChar(void){	char c;        if (!saa9730_kgdb_active) {     /* need to init device first */                return 0;        }        while (!(INB(&kgdb_uart->Lsr) & SAA9730_LSR_DR))                ;	c = INB(&kgdb_uart->Thr_Rbr);        return(c);}#endif