There is an existing serial port debug function: prom_putchar(), but it
can only print one char, herein add a new prom_printf(), which works
like printk, but print to serial port, which is very important to kernel
debugging.
Signed-off-by: Wu Zhangjin <wuzhangjin@xxxxxxxxx>
---
arch/mips/include/asm/mach-loongson/dbg.h | 17 ++++++++++++++
arch/mips/loongson/common/Makefile | 2 +-
arch/mips/loongson/common/dbg.c | 34 +++++++++++++++++++++++++++++
3 files changed, 52 insertions(+), 1 deletions(-)
create mode 100644 arch/mips/include/asm/mach-loongson/dbg.h
create mode 100644 arch/mips/loongson/common/dbg.c
diff --git a/arch/mips/include/asm/mach-loongson/dbg.h b/arch/mips/include/asm/mach-loongson/dbg.h
new file mode 100644
index 0000000..c676f8e
--- /dev/null
+++ b/arch/mips/include/asm/mach-loongson/dbg.h
@@ -0,0 +1,17 @@
+/*
+ * Copyright (C) 2009 Lemote Inc.
+ *
+ * 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.
+ */
+
+#ifndef _ASM_MACH_LOONGSON_DBG_H_
+#define _ASM_MACH_LOONGSON_DBG_H_
+
+/* serial port print support */
+extern void prom_putchar(char c);
+extern void prom_printf(char *fmt, ...);
+
+#endif /* _ASM_MACH_LOONGSON_DBG_H_ */
diff --git a/arch/mips/loongson/common/Makefile b/arch/mips/loongson/common/Makefile
index 656b3cc..adbe85c 100644
--- a/arch/mips/loongson/common/Makefile
+++ b/arch/mips/loongson/common/Makefile
@@ -8,4 +8,4 @@ obj-y += setup.o init.o cmdline.o env.o time.o reset.o irq.o \
#
# Early printk support
#
-obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
+obj-$(CONFIG_EARLY_PRINTK) += early_printk.o dbg.o
diff --git a/arch/mips/loongson/common/dbg.c b/arch/mips/loongson/common/dbg.c
new file mode 100644
index 0000000..214f295
--- /dev/null
+++ b/arch/mips/loongson/common/dbg.c
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2009 Lemote Inc.
+ *
+ * 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 <dbg.h>
+#include <loongson.h>
+
+#define PROM_PRINTF_BUF_LEN 1024
+
+void prom_printf(char *fmt, ...)
+{
+ static char buf[PROM_PRINTF_BUF_LEN];
+ va_list args;
+ char *ptr;
+
+
+ va_start(args, fmt);
+ vscnprintf(buf, sizeof(buf), fmt, args);
+
+ ptr = buf;
+
+ while (*ptr != 0) {
+ if (*ptr == '\n')
+ prom_putchar('\r');
+
+ prom_putchar(*ptr++);
+ }
+ va_end(args);
+}
--
1.6.2.1
