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Diffstat (limited to 'arch/mips/dec/prom/console.c')
-rw-r--r--arch/mips/dec/prom/console.c55
1 files changed, 55 insertions, 0 deletions
diff --git a/arch/mips/dec/prom/console.c b/arch/mips/dec/prom/console.c
new file mode 100644
index 00000000000..cade16ec7e5
--- /dev/null
+++ b/arch/mips/dec/prom/console.c
@@ -0,0 +1,55 @@
+/*
+ * arch/mips/dec/prom/console.c
+ *
+ * DECstation PROM-based early console support.
+ *
+ * Copyright (C) 2004 Maciej W. Rozycki
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include <linux/console.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+
+#include <asm/dec/prom.h>
+
+static void __init prom_console_write(struct console *con, const char *s,
+ unsigned int c)
+{
+ static char sfmt[] __initdata = "%%%us";
+ char fmt[13];
+
+ snprintf(fmt, sizeof(fmt), sfmt, c);
+ prom_printf(fmt, s);
+}
+
+static struct console promcons __initdata = {
+ .name = "prom",
+ .write = prom_console_write,
+ .flags = CON_PRINTBUFFER,
+ .index = -1,
+};
+
+static int promcons_output __initdata = 0;
+
+void __init register_prom_console(void)
+{
+ if (!promcons_output) {
+ promcons_output = 1;
+ register_console(&promcons);
+ }
+}
+
+void __init unregister_prom_console(void)
+{
+ if (promcons_output) {
+ unregister_console(&promcons);
+ promcons_output = 0;
+ }
+}
+
+void disable_early_printk(void)
+ __attribute__((alias("unregister_prom_console")));