[linux-2.6-block.git] / arch / mips / lantiq / early_printk.c

// 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);
}
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
171bb2f1	2	/*
171bb2f1	3	*
97b92108	4	* Copyright (C) 2010 John Crispin <john@phrozen.org>
171bb2f1 JC	5	*/
171bb2f1 JC	6
171bb2f1	7	#include <linux/cpu.h>
171bb2f1	8	#include <lantiq_soc.h>
5c93316c	9	#include <asm/setup.h>
171bb2f1	10
171bb2f1	11	#define ASC_BUF 1024
7705f686 TL	12	#define LTQ_ASC_FSTAT ((u32 *)(LTQ_EARLY_ASC + 0x0048))
	13	#ifdef __BIG_ENDIAN
	14	#define LTQ_ASC_TBUF ((u32 *)(LTQ_EARLY_ASC + 0x0020 + 3))
	15	#else
	16	#define LTQ_ASC_TBUF ((u32 *)(LTQ_EARLY_ASC + 0x0020))
	17	#endif
171bb2f1 JC	18	#define TXMASK 0x3F00
	19	#define TXOFFSET 8
	20
	21	void prom_putchar(char c)
	22	{
	23	unsigned long flags;
	24
	25	local_irq_save(flags);
	26	do { } while ((ltq_r32(LTQ_ASC_FSTAT) & TXMASK) >> TXOFFSET);
	27	if (c == '\n')
7705f686 TL	28	ltq_w8('\r', LTQ_ASC_TBUF);
7705f686 TL	29	ltq_w8(c, LTQ_ASC_TBUF);
171bb2f1 JC	30	local_irq_restore(flags);
171bb2f1 JC	31	}