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 000000000..4e4a28be1
--- /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);
+}