106 lines
2.3 KiB
C
106 lines
2.3 KiB
C
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/*
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* arch/sh64/kernel/early_printk.c
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*
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* SH-5 Early SCIF console (cloned and hacked from sh implementation)
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*
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* Copyright (C) 2003, 2004 Paul Mundt <lethal@linux-sh.org>
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* Copyright (C) 2002 M. R. Brown <mrbrown@0xd6.org>
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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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#include <asm/hardware.h>
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#define SCIF_BASE_ADDR 0x01030000
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#define SCIF_ADDR_SH5 PHYS_PERIPHERAL_BLOCK+SCIF_BASE_ADDR
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/*
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* Fixed virtual address where SCIF is mapped (should already be done
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* in arch/sh64/kernel/head.S!).
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*/
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#define SCIF_REG 0xfa030000
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enum {
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SCIF_SCSMR2 = SCIF_REG + 0x00,
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SCIF_SCBRR2 = SCIF_REG + 0x04,
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SCIF_SCSCR2 = SCIF_REG + 0x08,
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SCIF_SCFTDR2 = SCIF_REG + 0x0c,
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SCIF_SCFSR2 = SCIF_REG + 0x10,
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SCIF_SCFRDR2 = SCIF_REG + 0x14,
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SCIF_SCFCR2 = SCIF_REG + 0x18,
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SCIF_SCFDR2 = SCIF_REG + 0x1c,
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SCIF_SCSPTR2 = SCIF_REG + 0x20,
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SCIF_SCLSR2 = SCIF_REG + 0x24,
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};
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static void sh_console_putc(int c)
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{
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while (!(ctrl_inw(SCIF_SCFSR2) & 0x20))
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cpu_relax();
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ctrl_outb(c, SCIF_SCFTDR2);
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ctrl_outw((ctrl_inw(SCIF_SCFSR2) & 0x9f), SCIF_SCFSR2);
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if (c == '\n')
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sh_console_putc('\r');
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}
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static void sh_console_flush(void)
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{
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ctrl_outw((ctrl_inw(SCIF_SCFSR2) & 0xbf), SCIF_SCFSR2);
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while (!(ctrl_inw(SCIF_SCFSR2) & 0x40))
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cpu_relax();
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ctrl_outw((ctrl_inw(SCIF_SCFSR2) & 0xbf), SCIF_SCFSR2);
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}
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static void sh_console_write(struct console *con, const char *s, unsigned count)
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{
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while (count-- > 0)
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sh_console_putc(*s++);
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sh_console_flush();
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}
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static int __init sh_console_setup(struct console *con, char *options)
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{
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con->cflag = CREAD | HUPCL | CLOCAL | B19200 | CS8;
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return 0;
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}
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static struct console sh_console = {
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.name = "scifcon",
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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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void __init enable_early_printk(void)
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{
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ctrl_outb(0x2a, SCIF_SCBRR2); /* 19200bps */
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ctrl_outw(0x04, SCIF_SCFCR2); /* Reset TFRST */
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ctrl_outw(0x10, SCIF_SCFCR2); /* TTRG0=1 */
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ctrl_outw(0, SCIF_SCSPTR2);
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ctrl_outw(0x60, SCIF_SCFSR2);
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ctrl_outw(0, SCIF_SCLSR2);
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ctrl_outw(0x30, SCIF_SCSCR2);
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register_console(&sh_console);
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}
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void disable_early_printk(void)
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{
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unregister_console(&sh_console);
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}
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