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John Crispin171bb2f2011-03-30 09:27:47 +02001/*
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
John Crispin171bb2f2011-03-30 09:27:47 +02009#include <linux/cpu.h>
John Crispin171bb2f2011-03-30 09:27:47 +020010#include <lantiq_soc.h>
11
John Crispin171bb2f2011-03-30 09:27:47 +020012#define ASC_BUF 1024
Thomas Langer7705f682012-05-02 12:27:38 +020013#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
John Crispin171bb2f2011-03-30 09:27:47 +020019#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')
Thomas Langer7705f682012-05-02 12:27:38 +020029 ltq_w8('\r', LTQ_ASC_TBUF);
30 ltq_w8(c, LTQ_ASC_TBUF);
John Crispin171bb2f2011-03-30 09:27:47 +020031 local_irq_restore(flags);
32}