You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
155 lines
3.3 KiB
155 lines
3.3 KiB
/* 16550 serial driver for gdbstub I/O
|
|
*
|
|
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public Licence
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the Licence, or (at your option) any later version.
|
|
*/
|
|
#include <linux/string.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/console.h>
|
|
#include <linux/init.h>
|
|
#include <linux/nmi.h>
|
|
|
|
#include <asm/pgtable.h>
|
|
#include <asm/system.h>
|
|
#include <asm/gdb-stub.h>
|
|
#include <asm/exceptions.h>
|
|
#include <asm/serial-regs.h>
|
|
#include <asm/unit/serial.h>
|
|
|
|
/*
|
|
* initialise the GDB stub
|
|
*/
|
|
void gdbstub_io_init(void)
|
|
{
|
|
u16 tmp;
|
|
|
|
/* set up the serial port */
|
|
GDBPORT_SERIAL_LCR = UART_LCR_WLEN8; /* 1N8 */
|
|
GDBPORT_SERIAL_FCR = (UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
|
|
UART_FCR_CLEAR_XMIT);
|
|
|
|
FLOWCTL_CLEAR(DTR);
|
|
FLOWCTL_SET(RTS);
|
|
|
|
gdbstub_io_set_baud(115200);
|
|
|
|
/* we want to get serial receive interrupts */
|
|
XIRQxICR(GDBPORT_SERIAL_IRQ) = 0;
|
|
tmp = XIRQxICR(GDBPORT_SERIAL_IRQ);
|
|
|
|
IVAR0 = EXCEP_IRQ_LEVEL0;
|
|
set_intr_stub(EXCEP_IRQ_LEVEL0, gdbstub_io_rx_handler);
|
|
|
|
XIRQxICR(GDBPORT_SERIAL_IRQ) &= ~GxICR_REQUEST;
|
|
XIRQxICR(GDBPORT_SERIAL_IRQ) = GxICR_ENABLE | GxICR_LEVEL_0;
|
|
tmp = XIRQxICR(GDBPORT_SERIAL_IRQ);
|
|
|
|
GDBPORT_SERIAL_IER = UART_IER_RDI | UART_IER_RLSI;
|
|
|
|
/* permit level 0 IRQs to take place */
|
|
asm volatile(
|
|
" and %0,epsw \n"
|
|
" or %1,epsw \n"
|
|
:
|
|
: "i"(~EPSW_IM), "i"(EPSW_IE | EPSW_IM_1)
|
|
);
|
|
}
|
|
|
|
/*
|
|
* set up the GDB stub serial port baud rate timers
|
|
*/
|
|
void gdbstub_io_set_baud(unsigned baud)
|
|
{
|
|
unsigned value;
|
|
u8 lcr;
|
|
|
|
value = 18432000 / 16 / baud;
|
|
|
|
lcr = GDBPORT_SERIAL_LCR;
|
|
GDBPORT_SERIAL_LCR |= UART_LCR_DLAB;
|
|
GDBPORT_SERIAL_DLL = value & 0xff;
|
|
GDBPORT_SERIAL_DLM = (value >> 8) & 0xff;
|
|
GDBPORT_SERIAL_LCR = lcr;
|
|
}
|
|
|
|
/*
|
|
* wait for a character to come from the debugger
|
|
*/
|
|
int gdbstub_io_rx_char(unsigned char *_ch, int nonblock)
|
|
{
|
|
unsigned ix;
|
|
u8 ch, st;
|
|
|
|
*_ch = 0xff;
|
|
|
|
if (gdbstub_rx_unget) {
|
|
*_ch = gdbstub_rx_unget;
|
|
gdbstub_rx_unget = 0;
|
|
return 0;
|
|
}
|
|
|
|
try_again:
|
|
/* pull chars out of the buffer */
|
|
ix = gdbstub_rx_outp;
|
|
if (ix == gdbstub_rx_inp) {
|
|
if (nonblock)
|
|
return -EAGAIN;
|
|
#ifdef CONFIG_MN10300_WD_TIMER
|
|
watchdog_alert_counter = 0;
|
|
#endif /* CONFIG_MN10300_WD_TIMER */
|
|
goto try_again;
|
|
}
|
|
|
|
ch = gdbstub_rx_buffer[ix++];
|
|
st = gdbstub_rx_buffer[ix++];
|
|
gdbstub_rx_outp = ix & 0x00000fff;
|
|
|
|
if (st & UART_LSR_BI) {
|
|
gdbstub_proto("### GDB Rx Break Detected ###\n");
|
|
return -EINTR;
|
|
} else if (st & (UART_LSR_FE | UART_LSR_OE | UART_LSR_PE)) {
|
|
gdbstub_proto("### GDB Rx Error (st=%02x) ###\n", st);
|
|
return -EIO;
|
|
} else {
|
|
gdbstub_proto("### GDB Rx %02x (st=%02x) ###\n", ch, st);
|
|
*_ch = ch & 0x7f;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* send a character to the debugger
|
|
*/
|
|
void gdbstub_io_tx_char(unsigned char ch)
|
|
{
|
|
FLOWCTL_SET(DTR);
|
|
LSR_WAIT_FOR(THRE);
|
|
/* FLOWCTL_WAIT_FOR(CTS); */
|
|
|
|
if (ch == 0x0a) {
|
|
GDBPORT_SERIAL_TX = 0x0d;
|
|
LSR_WAIT_FOR(THRE);
|
|
/* FLOWCTL_WAIT_FOR(CTS); */
|
|
}
|
|
GDBPORT_SERIAL_TX = ch;
|
|
|
|
FLOWCTL_CLEAR(DTR);
|
|
}
|
|
|
|
/*
|
|
* send a character to the debugger
|
|
*/
|
|
void gdbstub_io_tx_flush(void)
|
|
{
|
|
LSR_WAIT_FOR(TEMT);
|
|
LSR_WAIT_FOR(THRE);
|
|
FLOWCTL_CLEAR(DTR);
|
|
}
|
|
|