kernel-ark/arch/mips/lantiq/early_printk.c
John Crispin 171bb2f19e MIPS: Lantiq: Add initial support for Lantiq SoCs
Add initial support for Mips based SoCs made by Lantiq. This series will add
support for the XWAY family.

The series allows booting a minimal system using a initramfs or NOR. Missing
drivers and support for Amazon and GPON family will be provided in a later
series.

[Ralf: Remove some cargo cult programming and fixed formatting.]

Signed-off-by: John Crispin <blogic@openwrt.org>
Signed-off-by: Ralph Hempel <ralph.hempel@lantiq.com>
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2252/
Patchwork: https://patchwork.linux-mips.org/patch/2371/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2011-05-19 09:55:41 +01:00

34 lines
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C

/*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
* Copyright (C) 2010 John Crispin <blogic@openwrt.org>
*/
#include <linux/init.h>
#include <linux/cpu.h>
#include <lantiq.h>
#include <lantiq_soc.h>
/* no ioremap possible at this early stage, lets use KSEG1 instead */
#define LTQ_ASC_BASE KSEG1ADDR(LTQ_ASC1_BASE_ADDR)
#define ASC_BUF 1024
#define LTQ_ASC_FSTAT ((u32 *)(LTQ_ASC_BASE + 0x0048))
#define LTQ_ASC_TBUF ((u32 *)(LTQ_ASC_BASE + 0x0020))
#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_w32('\r', LTQ_ASC_TBUF);
ltq_w32(c, LTQ_ASC_TBUF);
local_irq_restore(flags);
}