Merge branch 'upstream' of master.kernel.org:/pub/scm/linux/kernel/git/linville/wirel...
[linux-2.6] / arch / mips / mips-boards / generic / gdb_hook.c
1 /*
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
28 static struct serial_state rs_table[] = {
29         SERIAL_PORT_DFNS        /* Defined in serial.h */
30 };
31
32 static struct async_struct kdb_port_info = {0};
33
34 int (*generic_putDebugChar)(char);
35 char (*generic_getDebugChar)(void);
36
37 static __inline__ unsigned int serial_in(struct async_struct *info, int offset)
38 {
39         return inb(info->port + offset);
40 }
41
42 static __inline__ void serial_out(struct async_struct *info, int offset,
43                                 int value)
44 {
45         outb(value, info->port+offset);
46 }
47
48 int 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
98 int putDebugChar(char c)
99 {
100         return generic_putDebugChar(c);
101 }
102
103 char getDebugChar(void)
104 {
105         return generic_getDebugChar();
106 }
107
108 int 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
123 char 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 }