1 files changed, 62 insertions, 0 deletions
diff --git a/arch/m68k/kernel/early_printk.c b/arch/m68k/kernel/early_printk.c
new file mode 100644
index 0000000..919b837
--- /dev/null
+++ b/arch/m68k/kernel/early_printk.c
@@ -0,0 +1,62 @@
+/*
+ * 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.
+ *
+ * Copyright (c) 2014 Finn Thain
+ */
+
+#include <linux/kernel.h>
+#include <linux/console.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <asm/setup.h>
+
+asmlinkage void __init debug_cons_nputs(const char *s, unsigned n);
+
+static void debug_cons_write(struct console *c,
+			     const char *s, unsigned n)
+{
+	debug_cons_nputs(s, n);
+}
+
+static struct console early_console_instance = {
+	.name  = "debug",
+	.write = debug_cons_write,
+	.flags = CON_PRINTBUFFER | CON_BOOT,
+	.index = -1
+};
+
+static int __init setup_early_printk(char *buf)
+{
+	/* MVME16x registers an early console after interrupt setup. */
+	if (MACH_IS_MVME16x)
+		return 0;
+
+	if (early_console || buf)
+		return 0;
+
+	early_console = &early_console_instance;
+	register_console(early_console);
+
+	return 0;
+}
+early_param("earlyprintk", setup_early_printk);
+
+/*
+ * debug_cons_nputs() defined in arch/m68k/kernel/head.S cannot be called
+ * after init sections are discarded (for platforms that use it).
+ */
+#if !(defined(CONFIG_SUN3)   || defined(CONFIG_M68360) || \
+      defined(CONFIG_M68000) || defined(CONFIG_COLDFIRE))
+
+static int __init unregister_early_console(void)
+{
+	if (!early_console)
+		return 0;
+
+	return unregister_console(early_console);
+}
+late_initcall(unregister_early_console);
+
+#endif