1/*
2 *  This program is free software; you can redistribute it and/or modify it
3 *  under the terms of the GNU General Public License version 2 as published
4 *  by the Free Software Foundation.
5 *
6 *  Copyright (C) 2010 John Crispin <blogic@openwrt.org>
7 */
8
9#include <linux/cpu.h>
10#include <lantiq_soc.h>
11
12#define ASC_BUF		1024
13#define LTQ_ASC_FSTAT	((u32 *)(LTQ_EARLY_ASC + 0x0048))
14#ifdef __BIG_ENDIAN
15#define LTQ_ASC_TBUF	((u32 *)(LTQ_EARLY_ASC + 0x0020 + 3))
16#else
17#define LTQ_ASC_TBUF	((u32 *)(LTQ_EARLY_ASC + 0x0020))
18#endif
19#define TXMASK		0x3F00
20#define TXOFFSET	8
21
22void prom_putchar(char c)
23{
24	unsigned long flags;
25
26	local_irq_save(flags);
27	do { } while ((ltq_r32(LTQ_ASC_FSTAT) & TXMASK) >> TXOFFSET);
28	if (c == '\n')
29		ltq_w8('\r', LTQ_ASC_TBUF);
30	ltq_w8(c, LTQ_ASC_TBUF);
31	local_irq_restore(flags);
32}
33