blob: 6a1854de45799e40d91efa03f8385eecdbdb617b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Carsten Langgaard, carstenl@mips.com
3 * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
4 *
5 * This program is free software; you can distribute it and/or modify it
6 * under the terms of the GNU General Public License (Version 2) as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
17 *
18 * This is the interface to the remote debugger stub.
19 */
20#include <linux/types.h>
21#include <linux/serial.h>
22#include <linux/serialP.h>
23#include <linux/serial_reg.h>
24
25#include <asm/serial.h>
26#include <asm/io.h>
27
Ralf Baechle8f6539d2006-04-05 09:45:48 +010028static struct serial_state rs_table[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070029 SERIAL_PORT_DFNS /* Defined in serial.h */
30};
31
32static struct async_struct kdb_port_info = {0};
33
34int (*generic_putDebugChar)(char);
35char (*generic_getDebugChar)(void);
36
37static __inline__ unsigned int serial_in(struct async_struct *info, int offset)
38{
39 return inb(info->port + offset);
40}
41
42static __inline__ void serial_out(struct async_struct *info, int offset,
43 int value)
44{
45 outb(value, info->port+offset);
46}
47
48int rs_kgdb_hook(int tty_no, int speed) {
49 int t;
50 struct serial_state *ser = &rs_table[tty_no];
51
52 kdb_port_info.state = ser;
53 kdb_port_info.magic = SERIAL_MAGIC;
54 kdb_port_info.port = ser->port;
55 kdb_port_info.flags = ser->flags;
56
57 /*
58 * Clear all interrupts
59 */
60 serial_in(&kdb_port_info, UART_LSR);
61 serial_in(&kdb_port_info, UART_RX);
62 serial_in(&kdb_port_info, UART_IIR);
63 serial_in(&kdb_port_info, UART_MSR);
64
65 /*
66 * Now, initialize the UART
67 */
68 serial_out(&kdb_port_info, UART_LCR, UART_LCR_WLEN8); /* reset DLAB */
69 if (kdb_port_info.flags & ASYNC_FOURPORT) {
70 kdb_port_info.MCR = UART_MCR_DTR | UART_MCR_RTS;
71 t = UART_MCR_DTR | UART_MCR_OUT1;
72 } else {
73 kdb_port_info.MCR
74 = UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2;
75 t = UART_MCR_DTR | UART_MCR_RTS;
76 }
77
78 kdb_port_info.MCR = t; /* no interrupts, please */
79 serial_out(&kdb_port_info, UART_MCR, kdb_port_info.MCR);
80
81 /*
82 * and set the speed of the serial port
83 */
84 if (speed == 0)
85 speed = 9600;
86
87 t = kdb_port_info.state->baud_base / speed;
88 /* set DLAB */
89 serial_out(&kdb_port_info, UART_LCR, UART_LCR_WLEN8 | UART_LCR_DLAB);
90 serial_out(&kdb_port_info, UART_DLL, t & 0xff);/* LS of divisor */
91 serial_out(&kdb_port_info, UART_DLM, t >> 8); /* MS of divisor */
92 /* reset DLAB */
93 serial_out(&kdb_port_info, UART_LCR, UART_LCR_WLEN8);
94
95 return speed;
96}
97
98int putDebugChar(char c)
99{
100 return generic_putDebugChar(c);
101}
102
103char getDebugChar(void)
104{
105 return generic_getDebugChar();
106}
107
108int rs_putDebugChar(char c)
109{
110
111 if (!kdb_port_info.state) { /* need to init device first */
112 return 0;
113 }
114
115 while ((serial_in(&kdb_port_info, UART_LSR) & UART_LSR_THRE) == 0)
116 ;
117
118 serial_out(&kdb_port_info, UART_TX, c);
119
120 return 1;
121}
122
123char rs_getDebugChar(void)
124{
125 if (!kdb_port_info.state) { /* need to init device first */
126 return 0;
127 }
128
129 while (!(serial_in(&kdb_port_info, UART_LSR) & 1))
130 ;
131
132 return serial_in(&kdb_port_info, UART_RX);
133}