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Linux/arch/mn10300/kernel/gdb-io-serial.c

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  1 /* 16550 serial driver for gdbstub I/O
  2  *
  3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
  4  * Written by David Howells (dhowells@redhat.com)
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of the GNU General Public Licence
  8  * as published by the Free Software Foundation; either version
  9  * 2 of the Licence, or (at your option) any later version.
 10  */
 11 #include <linux/string.h>
 12 #include <linux/kernel.h>
 13 #include <linux/signal.h>
 14 #include <linux/sched.h>
 15 #include <linux/mm.h>
 16 #include <linux/console.h>
 17 #include <linux/init.h>
 18 #include <linux/nmi.h>
 19 
 20 #include <asm/pgtable.h>
 21 #include <asm/gdb-stub.h>
 22 #include <asm/exceptions.h>
 23 #include <asm/serial-regs.h>
 24 #include <unit/serial.h>
 25 #include <asm/smp.h>
 26 
 27 /*
 28  * initialise the GDB stub
 29  */
 30 void gdbstub_io_init(void)
 31 {
 32         u16 tmp;
 33 
 34         /* set up the serial port */
 35         GDBPORT_SERIAL_LCR = UART_LCR_WLEN8; /* 1N8 */
 36         GDBPORT_SERIAL_FCR = (UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
 37                               UART_FCR_CLEAR_XMIT);
 38 
 39         FLOWCTL_CLEAR(DTR);
 40         FLOWCTL_SET(RTS);
 41 
 42         gdbstub_io_set_baud(115200);
 43 
 44         /* we want to get serial receive interrupts */
 45         XIRQxICR(GDBPORT_SERIAL_IRQ) = 0;
 46         tmp = XIRQxICR(GDBPORT_SERIAL_IRQ);
 47 
 48 #if   CONFIG_GDBSTUB_IRQ_LEVEL == 0
 49         IVAR0 = EXCEP_IRQ_LEVEL0;
 50 #elif CONFIG_GDBSTUB_IRQ_LEVEL == 1
 51         IVAR1 = EXCEP_IRQ_LEVEL1;
 52 #elif CONFIG_GDBSTUB_IRQ_LEVEL == 2
 53         IVAR2 = EXCEP_IRQ_LEVEL2;
 54 #elif CONFIG_GDBSTUB_IRQ_LEVEL == 3
 55         IVAR3 = EXCEP_IRQ_LEVEL3;
 56 #elif CONFIG_GDBSTUB_IRQ_LEVEL == 4
 57         IVAR4 = EXCEP_IRQ_LEVEL4;
 58 #elif CONFIG_GDBSTUB_IRQ_LEVEL == 5
 59         IVAR5 = EXCEP_IRQ_LEVEL5;
 60 #else
 61 #error "Unknown irq level for gdbstub."
 62 #endif
 63 
 64         set_intr_stub(NUM2EXCEP_IRQ_LEVEL(CONFIG_GDBSTUB_IRQ_LEVEL),
 65                 gdbstub_io_rx_handler);
 66 
 67         XIRQxICR(GDBPORT_SERIAL_IRQ) &= ~GxICR_REQUEST;
 68         XIRQxICR(GDBPORT_SERIAL_IRQ) =
 69                 GxICR_ENABLE | NUM2GxICR_LEVEL(CONFIG_GDBSTUB_IRQ_LEVEL);
 70         tmp = XIRQxICR(GDBPORT_SERIAL_IRQ);
 71 
 72         GDBPORT_SERIAL_IER = UART_IER_RDI | UART_IER_RLSI;
 73 
 74         /* permit level 0 IRQs to take place */
 75         arch_local_change_intr_mask_level(
 76                 NUM2EPSW_IM(CONFIG_GDBSTUB_IRQ_LEVEL + 1));
 77 }
 78 
 79 /*
 80  * set up the GDB stub serial port baud rate timers
 81  */
 82 void gdbstub_io_set_baud(unsigned baud)
 83 {
 84         unsigned value;
 85         u8 lcr;
 86 
 87         value = 18432000 / 16 / baud;
 88 
 89         lcr = GDBPORT_SERIAL_LCR;
 90         GDBPORT_SERIAL_LCR |= UART_LCR_DLAB;
 91         GDBPORT_SERIAL_DLL = value & 0xff;
 92         GDBPORT_SERIAL_DLM = (value >> 8) & 0xff;
 93         GDBPORT_SERIAL_LCR = lcr;
 94 }
 95 
 96 /*
 97  * wait for a character to come from the debugger
 98  */
 99 int gdbstub_io_rx_char(unsigned char *_ch, int nonblock)
100 {
101         unsigned ix;
102         u8 ch, st;
103 #if defined(CONFIG_MN10300_WD_TIMER)
104         int cpu;
105 #endif
106 
107         *_ch = 0xff;
108 
109         if (gdbstub_rx_unget) {
110                 *_ch = gdbstub_rx_unget;
111                 gdbstub_rx_unget = 0;
112                 return 0;
113         }
114 
115  try_again:
116         /* pull chars out of the buffer */
117         ix = gdbstub_rx_outp;
118         barrier();
119         if (ix == gdbstub_rx_inp) {
120                 if (nonblock)
121                         return -EAGAIN;
122 #ifdef CONFIG_MN10300_WD_TIMER
123         for (cpu = 0; cpu < NR_CPUS; cpu++)
124                 watchdog_alert_counter[cpu] = 0;
125 #endif
126                 goto try_again;
127         }
128 
129         ch = gdbstub_rx_buffer[ix++];
130         st = gdbstub_rx_buffer[ix++];
131         barrier();
132         gdbstub_rx_outp = ix & 0x00000fff;
133 
134         if (st & UART_LSR_BI) {
135                 gdbstub_proto("### GDB Rx Break Detected ###\n");
136                 return -EINTR;
137         } else if (st & (UART_LSR_FE | UART_LSR_OE | UART_LSR_PE)) {
138                 gdbstub_proto("### GDB Rx Error (st=%02x) ###\n", st);
139                 return -EIO;
140         } else {
141                 gdbstub_proto("### GDB Rx %02x (st=%02x) ###\n", ch, st);
142                 *_ch = ch & 0x7f;
143                 return 0;
144         }
145 }
146 
147 /*
148  * send a character to the debugger
149  */
150 void gdbstub_io_tx_char(unsigned char ch)
151 {
152         FLOWCTL_SET(DTR);
153         LSR_WAIT_FOR(THRE);
154         /* FLOWCTL_WAIT_FOR(CTS); */
155 
156         if (ch == 0x0a) {
157                 GDBPORT_SERIAL_TX = 0x0d;
158                 LSR_WAIT_FOR(THRE);
159                 /* FLOWCTL_WAIT_FOR(CTS); */
160         }
161         GDBPORT_SERIAL_TX = ch;
162 
163         FLOWCTL_CLEAR(DTR);
164 }
165 
166 /*
167  * send a character to the debugger
168  */
169 void gdbstub_io_tx_flush(void)
170 {
171         LSR_WAIT_FOR(TEMT);
172         LSR_WAIT_FOR(THRE);
173         FLOWCTL_CLEAR(DTR);
174 }
175 

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