1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
|
/*
* File: arch/blackfin/kernel/early_printk.c
* Based on: arch/x86_64/kernel/early_printk.c
* Author: Robin Getz <rgetz@blackfin.uclinux.org
*
* Created: 14Aug2007
* Description: allow a console to be used for early printk
*
* Modified:
* Copyright 2004-2007 Analog Devices Inc.
*
* Bugs: Enter bugs at http://blackfin.uclinux.org/
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/serial_core.h>
#include <linux/console.h>
#include <linux/string.h>
#include <asm/blackfin.h>
#include <asm/irq_handler.h>
#include <asm/early_printk.h>
#ifdef CONFIG_SERIAL_BFIN
extern struct console *bfin_earlyserial_init(unsigned int port,
unsigned int cflag);
#endif
#ifdef CONFIG_BFIN_JTAG_COMM
extern struct console *bfin_jc_early_init(void);
#endif
static struct console *early_console;
/* Default console */
#define DEFAULT_PORT 0
#define DEFAULT_CFLAG CS8|B57600
/* Default console for early crashes */
#define DEFAULT_EARLY_PORT "serial,uart0,57600"
#ifdef CONFIG_SERIAL_CORE
/* What should get here is "0,57600" */
static struct console * __init earlyserial_init(char *buf)
{
int baud, bit;
char parity;
unsigned int serial_port = DEFAULT_PORT;
unsigned int cflag = DEFAULT_CFLAG;
serial_port = simple_strtoul(buf, &buf, 10);
buf++;
cflag = 0;
baud = simple_strtoul(buf, &buf, 10);
switch (baud) {
case 1200:
cflag |= B1200;
break;
case 2400:
cflag |= B2400;
break;
case 4800:
cflag |= B4800;
break;
case 9600:
cflag |= B9600;
break;
case 19200:
cflag |= B19200;
break;
case 38400:
cflag |= B38400;
break;
case 115200:
cflag |= B115200;
break;
default:
cflag |= B57600;
}
parity = buf[0];
buf++;
switch (parity) {
case 'e':
cflag |= PARENB;
break;
case 'o':
cflag |= PARODD;
break;
}
bit = simple_strtoul(buf, &buf, 10);
switch (bit) {
case 5:
cflag |= CS5;
break;
case 6:
cflag |= CS6;
break;
case 7:
cflag |= CS7;
break;
default:
cflag |= CS8;
}
#ifdef CONFIG_SERIAL_BFIN
return bfin_earlyserial_init(serial_port, cflag);
#else
return NULL;
#endif
}
#endif
int __init setup_early_printk(char *buf)
{
/* Crashing in here would be really bad, so check both the var
and the pointer before we start using it
*/
if (!buf)
return 0;
if (!*buf)
return 0;
if (early_console != NULL)
return 0;
#ifdef CONFIG_SERIAL_BFIN
/* Check for Blackfin Serial */
if (!strncmp(buf, "serial,uart", 11)) {
buf += 11;
early_console = earlyserial_init(buf);
}
#endif
#ifdef CONFIG_BFIN_JTAG_COMM
/* Check for Blackfin JTAG */
if (!strncmp(buf, "jtag", 4)) {
buf += 4;
early_console = bfin_jc_early_init();
}
#endif
#ifdef CONFIG_FB
/* TODO: add framebuffer console support */
#endif
if (likely(early_console)) {
early_console->flags |= CON_BOOT;
register_console(early_console);
printk(KERN_INFO "early printk enabled on %s%d\n",
early_console->name,
early_console->index);
}
return 0;
}
/*
* Set up a temporary Event Vector Table, so if something bad happens before
* the kernel is fully started, it doesn't vector off into somewhere we don't
* know
*/
asmlinkage void __init init_early_exception_vectors(void)
{
u32 evt;
SSYNC();
/* cannot program in software:
* evt0 - emulation (jtag)
* evt1 - reset
*/
for (evt = EVT2; evt <= EVT15; evt += 4)
bfin_write32(evt, early_trap);
CSYNC();
/* Set all the return from interrupt, exception, NMI to a known place
* so if we do a RETI, RETX or RETN by mistake - we go somewhere known
* Note - don't change RETS - we are in a subroutine, or
* RETE - since it might screw up if emulator is attached
*/
asm("\tRETI = %0; RETX = %0; RETN = %0;\n"
: : "p"(early_trap));
}
asmlinkage void __init early_trap_c(struct pt_regs *fp, void *retaddr)
{
/* This can happen before the uart is initialized, so initialize
* the UART now
*/
if (likely(early_console == NULL))
setup_early_printk(DEFAULT_EARLY_PORT);
dump_bfin_mem(fp);
show_regs(fp);
dump_bfin_trace_buffer();
panic("Died early");
}
early_param("earlyprintk", setup_early_printk);
|
