368dd5acd1
Implement the Panasonic MN10300 AM34 CPU subarch and implement SMP support for MN10300. Also implement support for the MN2WS0060 processor and the ASB2364 evaluation board which are AM34 based. Signed-off-by: Akira Takeuchi <takeuchi.akr@jp.panasonic.com> Signed-off-by: Kiyoshi Owada <owada.kiyoshi@jp.panasonic.com> Signed-off-by: David Howells <dhowells@redhat.com>
175 lines
3.8 KiB
C
175 lines
3.8 KiB
C
/* 16550 serial driver for gdbstub I/O
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/console.h>
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#include <linux/init.h>
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#include <linux/nmi.h>
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#include <asm/pgtable.h>
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#include <asm/system.h>
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#include <asm/gdb-stub.h>
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#include <asm/exceptions.h>
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#include <asm/serial-regs.h>
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#include <unit/serial.h>
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#include <asm/smp.h>
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/*
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* initialise the GDB stub
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*/
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void gdbstub_io_init(void)
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{
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u16 tmp;
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/* set up the serial port */
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GDBPORT_SERIAL_LCR = UART_LCR_WLEN8; /* 1N8 */
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GDBPORT_SERIAL_FCR = (UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
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UART_FCR_CLEAR_XMIT);
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FLOWCTL_CLEAR(DTR);
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FLOWCTL_SET(RTS);
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gdbstub_io_set_baud(115200);
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/* we want to get serial receive interrupts */
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XIRQxICR(GDBPORT_SERIAL_IRQ) = 0;
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tmp = XIRQxICR(GDBPORT_SERIAL_IRQ);
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#if CONFIG_GDBSTUB_IRQ_LEVEL == 0
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IVAR0 = EXCEP_IRQ_LEVEL0;
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#elif CONFIG_GDBSTUB_IRQ_LEVEL == 1
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IVAR1 = EXCEP_IRQ_LEVEL1;
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#elif CONFIG_GDBSTUB_IRQ_LEVEL == 2
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IVAR2 = EXCEP_IRQ_LEVEL2;
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#elif CONFIG_GDBSTUB_IRQ_LEVEL == 3
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IVAR3 = EXCEP_IRQ_LEVEL3;
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#elif CONFIG_GDBSTUB_IRQ_LEVEL == 4
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IVAR4 = EXCEP_IRQ_LEVEL4;
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#elif CONFIG_GDBSTUB_IRQ_LEVEL == 5
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IVAR5 = EXCEP_IRQ_LEVEL5;
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#else
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#error "Unknown irq level for gdbstub."
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#endif
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set_intr_stub(NUM2EXCEP_IRQ_LEVEL(CONFIG_GDBSTUB_IRQ_LEVEL),
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gdbstub_io_rx_handler);
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XIRQxICR(GDBPORT_SERIAL_IRQ) &= ~GxICR_REQUEST;
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XIRQxICR(GDBPORT_SERIAL_IRQ) =
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GxICR_ENABLE | NUM2GxICR_LEVEL(CONFIG_GDBSTUB_IRQ_LEVEL);
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tmp = XIRQxICR(GDBPORT_SERIAL_IRQ);
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GDBPORT_SERIAL_IER = UART_IER_RDI | UART_IER_RLSI;
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/* permit level 0 IRQs to take place */
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local_change_intr_mask_level(NUM2EPSW_IM(CONFIG_GDBSTUB_IRQ_LEVEL + 1));
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}
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/*
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* set up the GDB stub serial port baud rate timers
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*/
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void gdbstub_io_set_baud(unsigned baud)
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{
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unsigned value;
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u8 lcr;
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value = 18432000 / 16 / baud;
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lcr = GDBPORT_SERIAL_LCR;
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GDBPORT_SERIAL_LCR |= UART_LCR_DLAB;
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GDBPORT_SERIAL_DLL = value & 0xff;
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GDBPORT_SERIAL_DLM = (value >> 8) & 0xff;
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GDBPORT_SERIAL_LCR = lcr;
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}
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/*
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* wait for a character to come from the debugger
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*/
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int gdbstub_io_rx_char(unsigned char *_ch, int nonblock)
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{
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unsigned ix;
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u8 ch, st;
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#if defined(CONFIG_MN10300_WD_TIMER)
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int cpu;
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#endif
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*_ch = 0xff;
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if (gdbstub_rx_unget) {
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*_ch = gdbstub_rx_unget;
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gdbstub_rx_unget = 0;
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return 0;
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}
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try_again:
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/* pull chars out of the buffer */
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ix = gdbstub_rx_outp;
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barrier();
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if (ix == gdbstub_rx_inp) {
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if (nonblock)
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return -EAGAIN;
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#ifdef CONFIG_MN10300_WD_TIMER
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for (cpu = 0; cpu < NR_CPUS; cpu++)
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watchdog_alert_counter[cpu] = 0;
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#endif
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goto try_again;
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}
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ch = gdbstub_rx_buffer[ix++];
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st = gdbstub_rx_buffer[ix++];
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barrier();
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gdbstub_rx_outp = ix & 0x00000fff;
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if (st & UART_LSR_BI) {
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gdbstub_proto("### GDB Rx Break Detected ###\n");
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return -EINTR;
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} else if (st & (UART_LSR_FE | UART_LSR_OE | UART_LSR_PE)) {
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gdbstub_proto("### GDB Rx Error (st=%02x) ###\n", st);
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return -EIO;
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} else {
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gdbstub_proto("### GDB Rx %02x (st=%02x) ###\n", ch, st);
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*_ch = ch & 0x7f;
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return 0;
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}
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}
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/*
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* send a character to the debugger
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*/
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void gdbstub_io_tx_char(unsigned char ch)
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{
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FLOWCTL_SET(DTR);
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LSR_WAIT_FOR(THRE);
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/* FLOWCTL_WAIT_FOR(CTS); */
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if (ch == 0x0a) {
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GDBPORT_SERIAL_TX = 0x0d;
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LSR_WAIT_FOR(THRE);
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/* FLOWCTL_WAIT_FOR(CTS); */
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}
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GDBPORT_SERIAL_TX = ch;
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FLOWCTL_CLEAR(DTR);
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}
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/*
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* send a character to the debugger
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*/
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void gdbstub_io_tx_flush(void)
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{
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LSR_WAIT_FOR(TEMT);
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LSR_WAIT_FOR(THRE);
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FLOWCTL_CLEAR(DTR);
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}
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