sh: Consolidate the sh_bios earlyprintk code.
Now that the sh-sci earlyprintk is taken care of by the sh-sci driver
directly, there's no longer any reason for having a split-out
early_printk framework. sh_bios is the only other thing that uses it, so
we just migrate the leftovers in to there. As it's possible to have
multiple early_param()'s for the same string, there's not much point in
having this split out anymore anyways, particularly since the sh_bios
dependencies are still special-cased within sh-sci itself.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/kernel/sh_bios.c b/arch/sh/kernel/sh_bios.c
index 2a9c6d5..29cd252 100644
--- a/arch/sh/kernel/sh_bios.c
+++ b/arch/sh/kernel/sh_bios.c
@@ -1,17 +1,26 @@
/*
- * linux/arch/sh/kernel/sh_bios.c
* C interface for trapping into the standard LinuxSH BIOS.
*
* Copyright (C) 2000 Greg Banks, Mitch Davis
+ * Copyright (C) 1999, 2000 Niibe Yutaka
+ * Copyright (C) 2002 M. R. Brown
+ * Copyright (C) 2004 - 2010 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/module.h>
+#include <linux/console.h>
+#include <linux/tty.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/delay.h>
#include <asm/sh_bios.h>
#define BIOS_CALL_CONSOLE_WRITE 0
#define BIOS_CALL_ETH_NODE_ADDR 10
#define BIOS_CALL_SHUTDOWN 11
-#define BIOS_CALL_CHAR_OUT 0x1f /* TODO: hack */
#define BIOS_CALL_GDB_DETACH 0xff
static inline long sh_bios_call(long func, long arg0, long arg1, long arg2,
@@ -87,3 +96,70 @@
: "memory"
);
}
+
+/*
+ * 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 bios_console = {
+ .name = "bios",
+ .write = sh_console_write,
+ .setup = sh_console_setup,
+ .flags = CON_PRINTBUFFER,
+ .index = -1,
+};
+
+static struct console *early_console;
+
+static int __init setup_early_printk(char *buf)
+{
+ int keep_early = 0;
+
+ if (!buf)
+ return 0;
+
+ if (strstr(buf, "keep"))
+ keep_early = 1;
+
+ if (!strncmp(buf, "bios", 4))
+ early_console = &bios_console;
+
+ if (likely(early_console)) {
+ if (keep_early)
+ early_console->flags &= ~CON_BOOT;
+ else
+ early_console->flags |= CON_BOOT;
+ register_console(early_console);
+ }
+
+ return 0;
+}
+early_param("earlyprintk", setup_early_printk);