1 files changed, 137 insertions, 0 deletions
diff --git a/arch/sh/kernel/early_printk.c b/arch/sh/kernel/early_printk.c
new file mode 100644
index 000000000000..1378db375e17
--- /dev/null
+++ b/arch/sh/kernel/early_printk.c
@@ -0,0 +1,137 @@
+/*
+ * arch/sh/kernel/early_printk.c
+ *
+ *  Copyright (C) 1999, 2000  Niibe Yutaka
+ *  Copyright (C) 2002  M. R. Brown
+ *  Copyright (C) 2004  Paul Mundt
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/console.h>
+#include <linux/tty.h>
+#include <linux/init.h>
+#include <asm/io.h>
+
+#ifdef CONFIG_SH_STANDARD_BIOS
+#include <asm/sh_bios.h>
+
+/*
+ *	Print a string through the BIOS
+ */
+static void sh_console_write(struct console *co, const char *s,
+				 unsigned count)
+{
+	sh_bios_console_write(s, count);
+}
+
+/*
+ *	Setup initial baud/bits/parity. We do two things here:
+ *	- construct a cflag setting for the first rs_open()
+ *	- initialize the serial port
+ *	Return non-zero if we didn't find a serial port.
+ */
+static int __init sh_console_setup(struct console *co, char *options)
+{
+	int	cflag = CREAD | HUPCL | CLOCAL;
+
+	/*
+	 *	Now construct a cflag setting.
+	 *	TODO: this is a totally bogus cflag, as we have
+	 *	no idea what serial settings the BIOS is using, or
+	 *	even if its using the serial port at all.
+	 */
+	cflag |= B115200 | CS8 | /*no parity*/0;
+
+	co->cflag = cflag;
+
+	return 0;
+}
+
+static struct console early_console = {
+	.name		= "bios",
+	.write		= sh_console_write,
+	.setup		= sh_console_setup,
+	.flags		= CON_PRINTBUFFER,
+	.index		= -1,
+};
+#endif
+
+#ifdef CONFIG_EARLY_SCIF_CONSOLE
+#define SCIF_REG	0xffe80000
+
+static void scif_sercon_putc(int c)
+{
+	while (!(ctrl_inw(SCIF_REG + 0x10) & 0x20)) ;
+
+	ctrl_outb(c, SCIF_REG + 12);
+	ctrl_outw((ctrl_inw(SCIF_REG + 0x10) & 0x9f), SCIF_REG + 0x10);
+
+	if (c == '\n')
+		scif_sercon_putc('\r');
+}
+
+static void scif_sercon_flush(void)
+{
+	ctrl_outw((ctrl_inw(SCIF_REG + 0x10) & 0xbf), SCIF_REG + 0x10);
+
+	while (!(ctrl_inw(SCIF_REG + 0x10) & 0x40)) ;
+
+	ctrl_outw((ctrl_inw(SCIF_REG + 0x10) & 0xbf), SCIF_REG + 0x10);
+}
+
+static void scif_sercon_write(struct console *con, const char *s, unsigned count)
+{
+	while (count-- > 0)
+		scif_sercon_putc(*s++);
+
+	scif_sercon_flush();
+}
+
+static int __init scif_sercon_setup(struct console *con, char *options)
+{
+	con->cflag = CREAD | HUPCL | CLOCAL | B115200 | CS8;
+
+	return 0;
+}
+
+static struct console early_console = {
+	.name		= "sercon",
+	.write		= scif_sercon_write,
+	.setup		= scif_sercon_setup,
+	.flags		= CON_PRINTBUFFER,
+	.index		= -1,
+};
+
+void scif_sercon_init(int baud)
+{
+	ctrl_outw(0, SCIF_REG + 8);
+	ctrl_outw(0, SCIF_REG);
+
+	/* Set baud rate */
+	ctrl_outb((CONFIG_SH_PCLK_FREQ + 16 * baud) /
+		  (32 * baud) - 1, SCIF_REG + 4);
+
+	ctrl_outw(12, SCIF_REG + 24);
+	ctrl_outw(8, SCIF_REG + 24);
+	ctrl_outw(0, SCIF_REG + 32);
+	ctrl_outw(0x60, SCIF_REG + 16);
+	ctrl_outw(0, SCIF_REG + 36);
+	ctrl_outw(0x30, SCIF_REG + 8);
+}
+#endif
+
+void __init enable_early_printk(void)
+{
+#ifdef CONFIG_EARLY_SCIF_CONSOLE
+	scif_sercon_init(115200);
+#endif
+	register_console(&early_console);
+}
+
+void disable_early_printk(void)
+{
+	unregister_console(&early_console);
+}
+