2 * arch/sh/kernel/early_printk.c
4 * Copyright (C) 1999, 2000 Niibe Yutaka
5 * Copyright (C) 2002 M. R. Brown
6 * Copyright (C) 2004 - 2006 Paul Mundt
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file "COPYING" in the main directory of this archive
12 #include <linux/console.h>
13 #include <linux/tty.h>
14 #include <linux/init.h>
17 #ifdef CONFIG_SH_STANDARD_BIOS
18 #include <asm/sh_bios.h>
21 * Print a string through the BIOS
23 static void sh_console_write(struct console
*co
, const char *s
,
26 sh_bios_console_write(s
, count
);
30 * Setup initial baud/bits/parity. We do two things here:
31 * - construct a cflag setting for the first rs_open()
32 * - initialize the serial port
33 * Return non-zero if we didn't find a serial port.
35 static int __init
sh_console_setup(struct console
*co
, char *options
)
37 int cflag
= CREAD
| HUPCL
| CLOCAL
;
40 * Now construct a cflag setting.
41 * TODO: this is a totally bogus cflag, as we have
42 * no idea what serial settings the BIOS is using, or
43 * even if its using the serial port at all.
45 cflag
|= B115200
| CS8
| /*no parity*/0;
52 static struct console bios_console
= {
54 .write
= sh_console_write
,
55 .setup
= sh_console_setup
,
56 .flags
= CON_PRINTBUFFER
,
61 #ifdef CONFIG_EARLY_SCIF_CONSOLE
62 #include <linux/serial_core.h>
63 #include "../../../drivers/serial/sh-sci.h"
65 static struct uart_port scif_port
= {
66 .mapbase
= CONFIG_EARLY_SCIF_CONSOLE_PORT
,
67 .membase
= (char __iomem
*)CONFIG_EARLY_SCIF_CONSOLE_PORT
,
70 static void scif_sercon_putc(int c
)
72 while (((sci_in(&scif_port
, SCFDR
) & 0x1f00 >> 8) == 16))
75 sci_out(&scif_port
, SCxTDR
, c
);
76 sci_in(&scif_port
, SCxSR
);
77 sci_out(&scif_port
, SCxSR
, 0xf3 & ~(0x20 | 0x40));
79 while ((sci_in(&scif_port
, SCxSR
) & 0x40) == 0);
83 scif_sercon_putc('\r');
86 static void scif_sercon_write(struct console
*con
, const char *s
,
90 scif_sercon_putc(*s
++);
93 static int __init
scif_sercon_setup(struct console
*con
, char *options
)
95 con
->cflag
= CREAD
| HUPCL
| CLOCAL
| B115200
| CS8
;
100 static struct console scif_console
= {
102 .write
= scif_sercon_write
,
103 .setup
= scif_sercon_setup
,
104 .flags
= CON_PRINTBUFFER
,
108 #if defined(CONFIG_CPU_SH4) && !defined(CONFIG_SH_STANDARD_BIOS)
109 #define DEFAULT_BAUD 115200
111 * Simple SCIF init, primarily aimed at SH7750 and other similar SH-4
112 * devices that aren't using sh-ipl+g.
114 static void scif_sercon_init(char *s
)
116 unsigned baud
= DEFAULT_BAUD
;
123 /* ignore ioport/device name */
124 s
+= strcspn(s
, ",");
130 baud
= simple_strtoul(s
, &e
, 0);
131 if (baud
== 0 || s
== e
)
135 ctrl_outw(0, scif_port
.mapbase
+ 8);
136 ctrl_outw(0, scif_port
.mapbase
);
139 ctrl_outb((CONFIG_SH_PCLK_FREQ
+ 16 * baud
) /
140 (32 * baud
) - 1, scif_port
.mapbase
+ 4);
142 ctrl_outw(12, scif_port
.mapbase
+ 24);
143 ctrl_outw(8, scif_port
.mapbase
+ 24);
144 ctrl_outw(0, scif_port
.mapbase
+ 32);
145 ctrl_outw(0x60, scif_port
.mapbase
+ 16);
146 ctrl_outw(0, scif_port
.mapbase
+ 36);
147 ctrl_outw(0x30, scif_port
.mapbase
+ 8);
149 #endif /* CONFIG_CPU_SH4 && !CONFIG_SH_STANDARD_BIOS */
150 #endif /* CONFIG_EARLY_SCIF_CONSOLE */
153 * Setup a default console, if more than one is compiled in, rely on the
154 * earlyprintk= parsing to give priority.
156 static struct console
*early_console
=
157 #ifdef CONFIG_SH_STANDARD_BIOS
159 #elif defined(CONFIG_EARLY_SCIF_CONSOLE)
166 static int __initdata keep_early
;
167 static int early_console_initialized
;
169 int __init
setup_early_printk(char *buf
)
174 if (early_console_initialized
)
176 early_console_initialized
= 1;
178 if (strstr(buf
, "keep"))
181 #ifdef CONFIG_SH_STANDARD_BIOS
182 if (!strncmp(buf
, "bios", 4))
183 early_console
= &bios_console
;
185 #if defined(CONFIG_EARLY_SCIF_CONSOLE)
186 if (!strncmp(buf
, "serial", 6)) {
187 early_console
= &scif_console
;
189 #if defined(CONFIG_CPU_SH4) && !defined(CONFIG_SH_STANDARD_BIOS)
190 scif_sercon_init(buf
+ 6);
195 if (likely(early_console
))
196 register_console(early_console
);
200 early_param("earlyprintk", setup_early_printk
);
202 void __init
disable_early_printk(void)
204 if (!early_console_initialized
|| !early_console
)
207 printk("disabling early console\n");
208 unregister_console(early_console
);
210 printk("keeping early console\n");