mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 11:19:37 +00:00
![Ralf Baechle](/assets/img/avatar_default.png)
This is the same method as used in the serial driver. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
133 lines
3.3 KiB
C
133 lines
3.3 KiB
C
/*
|
|
* 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/types.h>
|
|
#include <linux/serial.h>
|
|
#include <linux/serialP.h>
|
|
#include <linux/serial_reg.h>
|
|
|
|
#include <asm/serial.h>
|
|
#include <asm/io.h>
|
|
|
|
static struct serial_state rs_table[] = {
|
|
SERIAL_PORT_DFNS /* Defined in serial.h */
|
|
};
|
|
|
|
static struct async_struct kdb_port_info = {0};
|
|
|
|
int (*generic_putDebugChar)(char);
|
|
char (*generic_getDebugChar)(void);
|
|
|
|
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);
|
|
}
|
|
|
|
int rs_kgdb_hook(int tty_no, int speed) {
|
|
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
|
|
*/
|
|
if (speed == 0)
|
|
speed = 9600;
|
|
|
|
t = kdb_port_info.state->baud_base / speed;
|
|
/* 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);
|
|
|
|
return speed;
|
|
}
|
|
|
|
int putDebugChar(char c)
|
|
{
|
|
return generic_putDebugChar(c);
|
|
}
|
|
|
|
char getDebugChar(void)
|
|
{
|
|
return generic_getDebugChar();
|
|
}
|
|
|
|
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);
|
|
}
|