1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
137 lines
2.9 KiB
C
137 lines
2.9 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 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 <asm/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 early_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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#define SCIF_REG 0xffe80000
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static void scif_sercon_putc(int c)
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{
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while (!(ctrl_inw(SCIF_REG + 0x10) & 0x20)) ;
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ctrl_outb(c, SCIF_REG + 12);
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ctrl_outw((ctrl_inw(SCIF_REG + 0x10) & 0x9f), SCIF_REG + 0x10);
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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_flush(void)
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{
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ctrl_outw((ctrl_inw(SCIF_REG + 0x10) & 0xbf), SCIF_REG + 0x10);
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while (!(ctrl_inw(SCIF_REG + 0x10) & 0x40)) ;
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ctrl_outw((ctrl_inw(SCIF_REG + 0x10) & 0xbf), SCIF_REG + 0x10);
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}
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static void scif_sercon_write(struct console *con, const char *s, 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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scif_sercon_flush();
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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 early_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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void scif_sercon_init(int baud)
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{
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ctrl_outw(0, SCIF_REG + 8);
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ctrl_outw(0, SCIF_REG);
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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_REG + 4);
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ctrl_outw(12, SCIF_REG + 24);
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ctrl_outw(8, SCIF_REG + 24);
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ctrl_outw(0, SCIF_REG + 32);
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ctrl_outw(0x60, SCIF_REG + 16);
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ctrl_outw(0, SCIF_REG + 36);
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ctrl_outw(0x30, SCIF_REG + 8);
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}
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#endif
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void __init enable_early_printk(void)
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{
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#ifdef CONFIG_EARLY_SCIF_CONSOLE
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scif_sercon_init(115200);
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#endif
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register_console(&early_console);
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}
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void disable_early_printk(void)
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{
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unregister_console(&early_console);
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}
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