forked from Minki/linux
8f6539d559
This is the same method as used in the serial driver. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
134 lines
3.3 KiB
C
134 lines
3.3 KiB
C
/*
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* Carsten Langgaard, carstenl@mips.com
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* Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
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*
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* This program is free software; you can distribute it and/or modify it
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* under the terms of the GNU General Public License (Version 2) as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
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*
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* This is the interface to the remote debugger stub.
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*/
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#include <linux/types.h>
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#include <linux/serial.h>
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#include <linux/serialP.h>
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#include <linux/serial_reg.h>
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#include <asm/serial.h>
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#include <asm/io.h>
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static struct serial_state rs_table[] = {
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SERIAL_PORT_DFNS /* Defined in serial.h */
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};
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static struct async_struct kdb_port_info = {0};
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int (*generic_putDebugChar)(char);
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char (*generic_getDebugChar)(void);
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static __inline__ unsigned int serial_in(struct async_struct *info, int offset)
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{
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return inb(info->port + offset);
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}
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static __inline__ void serial_out(struct async_struct *info, int offset,
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int value)
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{
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outb(value, info->port+offset);
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}
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int rs_kgdb_hook(int tty_no, int speed) {
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int t;
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struct serial_state *ser = &rs_table[tty_no];
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kdb_port_info.state = ser;
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kdb_port_info.magic = SERIAL_MAGIC;
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kdb_port_info.port = ser->port;
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kdb_port_info.flags = ser->flags;
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/*
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* Clear all interrupts
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*/
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serial_in(&kdb_port_info, UART_LSR);
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serial_in(&kdb_port_info, UART_RX);
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serial_in(&kdb_port_info, UART_IIR);
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serial_in(&kdb_port_info, UART_MSR);
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/*
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* Now, initialize the UART
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*/
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serial_out(&kdb_port_info, UART_LCR, UART_LCR_WLEN8); /* reset DLAB */
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if (kdb_port_info.flags & ASYNC_FOURPORT) {
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kdb_port_info.MCR = UART_MCR_DTR | UART_MCR_RTS;
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t = UART_MCR_DTR | UART_MCR_OUT1;
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} else {
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kdb_port_info.MCR
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= UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2;
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t = UART_MCR_DTR | UART_MCR_RTS;
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}
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kdb_port_info.MCR = t; /* no interrupts, please */
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serial_out(&kdb_port_info, UART_MCR, kdb_port_info.MCR);
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/*
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* and set the speed of the serial port
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*/
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if (speed == 0)
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speed = 9600;
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t = kdb_port_info.state->baud_base / speed;
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/* set DLAB */
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serial_out(&kdb_port_info, UART_LCR, UART_LCR_WLEN8 | UART_LCR_DLAB);
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serial_out(&kdb_port_info, UART_DLL, t & 0xff);/* LS of divisor */
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serial_out(&kdb_port_info, UART_DLM, t >> 8); /* MS of divisor */
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/* reset DLAB */
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serial_out(&kdb_port_info, UART_LCR, UART_LCR_WLEN8);
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return speed;
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}
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int putDebugChar(char c)
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{
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return generic_putDebugChar(c);
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}
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char getDebugChar(void)
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{
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return generic_getDebugChar();
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}
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int rs_putDebugChar(char c)
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{
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if (!kdb_port_info.state) { /* need to init device first */
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return 0;
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}
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while ((serial_in(&kdb_port_info, UART_LSR) & UART_LSR_THRE) == 0)
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;
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serial_out(&kdb_port_info, UART_TX, c);
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return 1;
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}
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char rs_getDebugChar(void)
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{
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if (!kdb_port_info.state) { /* need to init device first */
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return 0;
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}
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while (!(serial_in(&kdb_port_info, UART_LSR) & 1))
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;
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return serial_in(&kdb_port_info, UART_RX);
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}
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