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>
16 #include <linux/delay.h>
18 #ifdef CONFIG_SH_STANDARD_BIOS
19 #include <asm/sh_bios.h>
22 * Print a string through the BIOS
24 static void sh_console_write(struct console *co, const char *s,
27 sh_bios_console_write(s, count);
31 * Setup initial baud/bits/parity. We do two things here:
32 * - construct a cflag setting for the first rs_open()
33 * - initialize the serial port
34 * Return non-zero if we didn't find a serial port.
36 static int __init sh_console_setup(struct console *co, char *options)
38 int cflag = CREAD | HUPCL | CLOCAL;
41 * Now construct a cflag setting.
42 * TODO: this is a totally bogus cflag, as we have
43 * no idea what serial settings the BIOS is using, or
44 * even if its using the serial port at all.
46 cflag |= B115200 | CS8 | /*no parity*/0;
53 static struct console bios_console = {
55 .write = sh_console_write,
56 .setup = sh_console_setup,
57 .flags = CON_PRINTBUFFER,
62 #ifdef CONFIG_EARLY_SCIF_CONSOLE
63 #include <linux/serial_core.h>
64 #include "../../../drivers/serial/sh-sci.h"
66 #if defined(CONFIG_CPU_SUBTYPE_SH7720)
67 #define EPK_SCSMR_VALUE 0x000
68 #define EPK_SCBRR_VALUE 0x00C
69 #define EPK_FIFO_SIZE 64
70 #define EPK_FIFO_BITS (0x7f00 >> 8)
72 #define EPK_FIFO_SIZE 16
73 #define EPK_FIFO_BITS (0x1f00 >> 8)
78 static struct uart_port scif_port = {
79 .mapbase = CONFIG_EARLY_SCIF_CONSOLE_PORT,
80 .membase = (char __iomem *)CONFIG_EARLY_SCIF_CONSOLE_PORT,
83 static void scif_sercon_putc(int c)
85 while (((sci_in(&scif_port, SCFDR) & EPK_FIFO_BITS) >= EPK_FIFO_SIZE))
88 sci_out(&scif_port, SCxTDR, c);
89 sci_in(&scif_port, SCxSR);
90 sci_out(&scif_port, SCxSR, 0xf3 & ~(0x20 | 0x40));
92 while ((sci_in(&scif_port, SCxSR) & 0x40) == 0)
96 scif_sercon_putc('\r');
99 static void scif_sercon_write(struct console *con, const char *s,
103 scif_sercon_putc(*s++);
106 static int __init scif_sercon_setup(struct console *con, char *options)
108 con->cflag = CREAD | HUPCL | CLOCAL | B115200 | CS8;
113 static struct console scif_console = {
115 .write = scif_sercon_write,
116 .setup = scif_sercon_setup,
117 .flags = CON_PRINTBUFFER,
121 #if !defined(CONFIG_SH_STANDARD_BIOS)
122 #if defined(CONFIG_CPU_SUBTYPE_SH7720)
123 static void scif_sercon_init(char *s)
125 sci_out(&scif_port, SCSCR, 0x0000); /* clear TE and RE */
126 sci_out(&scif_port, SCFCR, 0x4006); /* reset */
127 sci_out(&scif_port, SCSCR, 0x0000); /* select internal clock */
128 sci_out(&scif_port, SCSMR, EPK_SCSMR_VALUE);
129 sci_out(&scif_port, SCBRR, EPK_SCBRR_VALUE);
131 mdelay(1); /* wait 1-bit time */
133 sci_out(&scif_port, SCFCR, 0x0030); /* TTRG=b'11 */
134 sci_out(&scif_port, SCSCR, 0x0030); /* TE, RE */
136 #elif defined(CONFIG_CPU_SH4)
137 #define DEFAULT_BAUD 115200
139 * Simple SCIF init, primarily aimed at SH7750 and other similar SH-4
140 * devices that aren't using sh-ipl+g.
142 static void scif_sercon_init(char *s)
144 unsigned baud = DEFAULT_BAUD;
151 /* ignore ioport/device name */
152 s += strcspn(s, ",");
158 baud = simple_strtoul(s, &e, 0);
159 if (baud == 0 || s == e)
163 ctrl_outw(0, scif_port.mapbase + 8);
164 ctrl_outw(0, scif_port.mapbase);
167 ctrl_outb((CONFIG_SH_PCLK_FREQ + 16 * baud) /
168 (32 * baud) - 1, scif_port.mapbase + 4);
170 ctrl_outw(12, scif_port.mapbase + 24);
171 ctrl_outw(8, scif_port.mapbase + 24);
172 ctrl_outw(0, scif_port.mapbase + 32);
173 ctrl_outw(0x60, scif_port.mapbase + 16);
174 ctrl_outw(0, scif_port.mapbase + 36);
175 ctrl_outw(0x30, scif_port.mapbase + 8);
177 #endif /* defined(CONFIG_CPU_SUBTYPE_SH7720) */
178 #endif /* !defined(CONFIG_SH_STANDARD_BIOS) */
179 #endif /* CONFIG_EARLY_SCIF_CONSOLE */
182 * Setup a default console, if more than one is compiled in, rely on the
183 * earlyprintk= parsing to give priority.
185 static struct console *early_console =
186 #ifdef CONFIG_SH_STANDARD_BIOS
188 #elif defined(CONFIG_EARLY_SCIF_CONSOLE)
195 static int __initdata keep_early;
196 static int early_console_initialized;
198 int __init setup_early_printk(char *buf)
203 if (early_console_initialized)
205 early_console_initialized = 1;
207 if (strstr(buf, "keep"))
210 #ifdef CONFIG_SH_STANDARD_BIOS
211 if (!strncmp(buf, "bios", 4))
212 early_console = &bios_console;
214 #if defined(CONFIG_EARLY_SCIF_CONSOLE)
215 if (!strncmp(buf, "serial", 6)) {
216 early_console = &scif_console;
218 #if (defined(CONFIG_CPU_SH4) || defined(CONFIG_CPU_SUBTYPE_SH7720)) && \
219 !defined(CONFIG_SH_STANDARD_BIOS)
220 scif_sercon_init(buf + 6);
225 if (likely(early_console)) {
227 early_console->flags &= ~CON_BOOT;
229 early_console->flags |= CON_BOOT;
230 register_console(early_console);
235 early_param("earlyprintk", setup_early_printk);