192 lines
4.3 KiB
C
192 lines
4.3 KiB
C
/*
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* arch/sh/kernel/early_printk.c
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*
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* Copyright (C) 1999, 2000 Niibe Yutaka
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* Copyright (C) 2002 M. R. Brown
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* Copyright (C) 2004 - 2006 Paul Mundt
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/console.h>
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#include <linux/tty.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#ifdef CONFIG_SH_STANDARD_BIOS
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#include <asm/sh_bios.h>
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/*
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* Print a string through the BIOS
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*/
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static void sh_console_write(struct console *co, const char *s,
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unsigned count)
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{
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sh_bios_console_write(s, count);
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}
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/*
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* Setup initial baud/bits/parity. We do two things here:
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* - construct a cflag setting for the first rs_open()
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* - initialize the serial port
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* Return non-zero if we didn't find a serial port.
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*/
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static int __init sh_console_setup(struct console *co, char *options)
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{
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int cflag = CREAD | HUPCL | CLOCAL;
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/*
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* Now construct a cflag setting.
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* TODO: this is a totally bogus cflag, as we have
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* no idea what serial settings the BIOS is using, or
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* even if its using the serial port at all.
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*/
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cflag |= B115200 | CS8 | /*no parity*/0;
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co->cflag = cflag;
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return 0;
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}
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static struct console bios_console = {
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.name = "bios",
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.write = sh_console_write,
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.setup = sh_console_setup,
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.flags = CON_PRINTBUFFER,
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.index = -1,
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};
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#endif
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#ifdef CONFIG_EARLY_SCIF_CONSOLE
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#include <linux/serial_core.h>
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#include "../../../drivers/serial/sh-sci.h"
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static struct uart_port scif_port = {
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.mapbase = CONFIG_EARLY_SCIF_CONSOLE_PORT,
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.membase = (char __iomem *)CONFIG_EARLY_SCIF_CONSOLE_PORT,
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};
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static void scif_sercon_putc(int c)
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{
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while (((sci_in(&scif_port, SCFDR) & 0x1f00 >> 8) == 16))
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;
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sci_out(&scif_port, SCxTDR, c);
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sci_in(&scif_port, SCxSR);
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sci_out(&scif_port, SCxSR, 0xf3 & ~(0x20 | 0x40));
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while ((sci_in(&scif_port, SCxSR) & 0x40) == 0);
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;
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if (c == '\n')
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scif_sercon_putc('\r');
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}
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static void scif_sercon_write(struct console *con, const char *s,
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unsigned count)
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{
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while (count-- > 0)
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scif_sercon_putc(*s++);
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}
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static int __init scif_sercon_setup(struct console *con, char *options)
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{
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con->cflag = CREAD | HUPCL | CLOCAL | B115200 | CS8;
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return 0;
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}
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static struct console scif_console = {
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.name = "sercon",
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.write = scif_sercon_write,
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.setup = scif_sercon_setup,
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.flags = CON_PRINTBUFFER,
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.index = -1,
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};
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#if defined(CONFIG_CPU_SH4) && !defined(CONFIG_SH_STANDARD_BIOS)
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/*
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* Simple SCIF init, primarily aimed at SH7750 and other similar SH-4
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* devices that aren't using sh-ipl+g.
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*/
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static void scif_sercon_init(int baud)
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{
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ctrl_outw(0, scif_port.mapbase + 8);
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ctrl_outw(0, scif_port.mapbase);
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/* Set baud rate */
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ctrl_outb((CONFIG_SH_PCLK_FREQ + 16 * baud) /
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(32 * baud) - 1, scif_port.mapbase + 4);
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ctrl_outw(12, scif_port.mapbase + 24);
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ctrl_outw(8, scif_port.mapbase + 24);
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ctrl_outw(0, scif_port.mapbase + 32);
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ctrl_outw(0x60, scif_port.mapbase + 16);
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ctrl_outw(0, scif_port.mapbase + 36);
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ctrl_outw(0x30, scif_port.mapbase + 8);
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}
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#endif /* CONFIG_CPU_SH4 && !CONFIG_SH_STANDARD_BIOS */
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#endif /* CONFIG_EARLY_SCIF_CONSOLE */
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/*
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* Setup a default console, if more than one is compiled in, rely on the
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* earlyprintk= parsing to give priority.
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*/
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static struct console *early_console =
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#ifdef CONFIG_SH_STANDARD_BIOS
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&bios_console
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#elif defined(CONFIG_EARLY_SCIF_CONSOLE)
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&scif_console
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#else
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NULL
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#endif
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;
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static int __initdata keep_early;
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static int early_console_initialized;
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int __init setup_early_printk(char *buf)
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{
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if (!buf)
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return 0;
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if (early_console_initialized)
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return 0;
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early_console_initialized = 1;
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if (strstr(buf, "keep"))
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keep_early = 1;
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#ifdef CONFIG_SH_STANDARD_BIOS
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if (!strncmp(buf, "bios", 4))
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early_console = &bios_console;
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#endif
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#if defined(CONFIG_EARLY_SCIF_CONSOLE)
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if (!strncmp(buf, "serial", 6)) {
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early_console = &scif_console;
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#if defined(CONFIG_CPU_SH4) && !defined(CONFIG_SH_STANDARD_BIOS)
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scif_sercon_init(115200);
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#endif
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}
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#endif
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if (likely(early_console))
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register_console(early_console);
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return 0;
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}
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early_param("earlyprintk", setup_early_printk);
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void __init disable_early_printk(void)
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{
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if (!early_console_initialized || !early_console)
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return;
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if (!keep_early) {
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printk("disabling early console\n");
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unregister_console(early_console);
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} else
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printk("keeping early console\n");
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}
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