1 files changed, 31 insertions, 0 deletions
diff --git a/arch/mips/lantiq/early_printk.c b/arch/mips/lantiq/early_printk.c
new file mode 100644
index 0000000000..4e4a28be1d
--- /dev/null
+++ b/arch/mips/lantiq/early_printk.c
@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *
+ *  Copyright (C) 2010 John Crispin <john@phrozen.org>
+ */
+
+#include <linux/cpu.h>
+#include <lantiq_soc.h>
+#include <asm/setup.h>
+
+#define ASC_BUF		1024
+#define LTQ_ASC_FSTAT	((u32 *)(LTQ_EARLY_ASC + 0x0048))
+#ifdef __BIG_ENDIAN
+#define LTQ_ASC_TBUF	((u32 *)(LTQ_EARLY_ASC + 0x0020 + 3))
+#else
+#define LTQ_ASC_TBUF	((u32 *)(LTQ_EARLY_ASC + 0x0020))
+#endif
+#define TXMASK		0x3F00
+#define TXOFFSET	8
+
+void prom_putchar(char c)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	do { } while ((ltq_r32(LTQ_ASC_FSTAT) & TXMASK) >> TXOFFSET);
+	if (c == '\n')
+		ltq_w8('\r', LTQ_ASC_TBUF);
+	ltq_w8(c, LTQ_ASC_TBUF);
+	local_irq_restore(flags);
+}