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
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
/*
* arch/sh/kernel/early_printk.c
*
* Copyright (C) 1999, 2000 Niibe Yutaka
* Copyright (C) 2002 M. R. Brown
* Copyright (C) 2004 - 2007 Paul Mundt
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/console.h>
#include <linux/tty.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/delay.h>
#ifdef CONFIG_SH_STANDARD_BIOS
#include <asm/sh_bios.h>
/*
* Print a string through the BIOS
*/
static void sh_console_write(struct console *co, const char *s,
unsigned count)
{
sh_bios_console_write(s, count);
}
/*
* Setup initial baud/bits/parity. We do two things here:
* - construct a cflag setting for the first rs_open()
* - initialize the serial port
* Return non-zero if we didn't find a serial port.
*/
static int __init sh_console_setup(struct console *co, char *options)
{
int cflag = CREAD | HUPCL | CLOCAL;
/*
* Now construct a cflag setting.
* TODO: this is a totally bogus cflag, as we have
* no idea what serial settings the BIOS is using, or
* even if its using the serial port at all.
*/
cflag |= B115200 | CS8 | /*no parity*/0;
co->cflag = cflag;
return 0;
}
static struct console bios_console = {
.name = "bios",
.write = sh_console_write,
.setup = sh_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
};
#endif
#ifdef CONFIG_EARLY_SCIF_CONSOLE
#include <linux/serial_core.h>
#include "../../../drivers/serial/sh-sci.h"
#if defined(CONFIG_CPU_SUBTYPE_SH7720) || \
defined(CONFIG_CPU_SUBTYPE_SH7721)
#define EPK_SCSMR_VALUE 0x000
#define EPK_SCBRR_VALUE 0x00C
#define EPK_FIFO_SIZE 64
#define EPK_FIFO_BITS (0x7f00 >> 8)
#else
#define EPK_FIFO_SIZE 16
#define EPK_FIFO_BITS (0x1f00 >> 8)
#endif
static struct uart_port scif_port = {
.type = PORT_SCIF,
.mapbase = CONFIG_EARLY_SCIF_CONSOLE_PORT,
.membase = (char __iomem *)CONFIG_EARLY_SCIF_CONSOLE_PORT,
};
static void scif_sercon_putc(int c)
{
while (((sci_in(&scif_port, SCFDR) & EPK_FIFO_BITS) >= EPK_FIFO_SIZE))
;
sci_out(&scif_port, SCxTDR, c);
sci_in(&scif_port, SCxSR);
sci_out(&scif_port, SCxSR, 0xf3 & ~(0x20 | 0x40));
while ((sci_in(&scif_port, SCxSR) & 0x40) == 0)
;
if (c == '\n')
scif_sercon_putc('\r');
}
static void scif_sercon_write(struct console *con, const char *s,
unsigned count)
{
while (count-- > 0)
scif_sercon_putc(*s++);
}
static int __init scif_sercon_setup(struct console *con, char *options)
{
con->cflag = CREAD | HUPCL | CLOCAL | B115200 | CS8;
return 0;
}
static struct console scif_console = {
.name = "sercon",
.write = scif_sercon_write,
.setup = scif_sercon_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
};
#if !defined(CONFIG_SH_STANDARD_BIOS)
#if defined(CONFIG_CPU_SUBTYPE_SH7720) || \
defined(CONFIG_CPU_SUBTYPE_SH7721)
static void scif_sercon_init(char *s)
{
sci_out(&scif_port, SCSCR, 0x0000); /* clear TE and RE */
sci_out(&scif_port, SCFCR, 0x4006); /* reset */
sci_out(&scif_port, SCSCR, 0x0000); /* select internal clock */
sci_out(&scif_port, SCSMR, EPK_SCSMR_VALUE);
sci_out(&scif_port, SCBRR, EPK_SCBRR_VALUE);
mdelay(1); /* wait 1-bit time */
sci_out(&scif_port, SCFCR, 0x0030); /* TTRG=b'11 */
sci_out(&scif_port, SCSCR, 0x0030); /* TE, RE */
}
#elif defined(CONFIG_CPU_SH4)
#define DEFAULT_BAUD 115200
/*
* Simple SCIF init, primarily aimed at SH7750 and other similar SH-4
* devices that aren't using sh-ipl+g.
*/
static void scif_sercon_init(char *s)
{
struct uart_port *port = &scif_port;
unsigned baud = DEFAULT_BAUD;
unsigned int status;
char *e;
if (*s == ',')
++s;
if (*s) {
/* ignore ioport/device name */
s += strcspn(s, ",");
if (*s == ',')
s++;
}
if (*s) {
baud = simple_strtoul(s, &e, 0);
if (baud == 0 || s == e)
baud = DEFAULT_BAUD;
}
do {
status = sci_in(port, SCxSR);
} while (!(status & SCxSR_TEND(port)));
sci_out(port, SCSCR, 0); /* TE=0, RE=0 */
sci_out(port, SCFCR, SCFCR_RFRST | SCFCR_TFRST);
sci_out(port, SCSMR, 0);
/* Set baud rate */
sci_out(port, SCBRR, (CONFIG_SH_PCLK_FREQ + 16 * baud) /
(32 * baud) - 1);
udelay((1000000+(baud-1)) / baud); /* Wait one bit interval */
sci_out(port, SCSPTR, 0);
sci_out(port, SCxSR, 0x60);
sci_out(port, SCLSR, 0);
sci_out(port, SCFCR, 0);
sci_out(port, SCSCR, 0x30); /* TE=1, RE=1 */
}
#endif /* defined(CONFIG_CPU_SUBTYPE_SH7720) */
#endif /* !defined(CONFIG_SH_STANDARD_BIOS) */
#endif /* CONFIG_EARLY_SCIF_CONSOLE */
/*
* Setup a default console, if more than one is compiled in, rely on the
* earlyprintk= parsing to give priority.
*/
static struct console *early_console =
#ifdef CONFIG_SH_STANDARD_BIOS
&bios_console
#elif defined(CONFIG_EARLY_SCIF_CONSOLE)
&scif_console
#else
NULL
#endif
;
static int __init setup_early_printk(char *buf)
{
int keep_early = 0;
if (!buf)
return 0;
if (strstr(buf, "keep"))
keep_early = 1;
#ifdef CONFIG_SH_STANDARD_BIOS
if (!strncmp(buf, "bios", 4))
early_console = &bios_console;
#endif
#if defined(CONFIG_EARLY_SCIF_CONSOLE)
if (!strncmp(buf, "serial", 6)) {
early_console = &scif_console;
#if !defined(CONFIG_SH_STANDARD_BIOS)
#if defined(CONFIG_CPU_SH4) || defined(CONFIG_CPU_SUBTYPE_SH7720) || \
defined(CONFIG_CPU_SUBTYPE_SH7721)
scif_sercon_init(buf + 6);
#endif
#endif
}
#endif
if (likely(early_console)) {
if (keep_early)
early_console->flags &= ~CON_BOOT;
else
early_console->flags |= CON_BOOT;
register_console(early_console);
}
return 0;
}
early_param("earlyprintk", setup_early_printk);
|
