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Commit 8aaa7278 authored by Sergey Ryazanov's avatar Sergey Ryazanov Committed by Ralf Baechle
Browse files

MIPS: ath25: add early printk support 



Signed-off-by: default avatarSergey Ryazanov <ryazanov.s.a@gmail.com>
Cc: Linux MIPS <linux-mips@linux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/8241/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 1753e74e

arch/mips/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -107,6 +107,7 @@ config ATH25 
	select SYS_HAS_CPU_MIPS32_R1

	select SYS_SUPPORTS_BIG_ENDIAN

	select SYS_SUPPORTS_32BIT_KERNEL

	select SYS_HAS_EARLY_PRINTK

	help

	  Support for Atheros AR231x and Atheros AR531x based boards

arch/mips/ath25/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -10,5 +10,7 @@ 


obj-y += board.o prom.o devices.o



obj-$(CONFIG_EARLY_PRINTK) += early_printk.o



obj-$(CONFIG_SOC_AR5312) += ar5312.o

obj-$(CONFIG_SOC_AR2315) += ar2315.o

arch/mips/ath25/early_printk.c

0 → 100644
+44 −0
Original line number Diff line number Diff line 
/*

 * This file is subject to the terms and conditions of the GNU General Public

 * License.  See the file "COPYING" in the main directory of this archive

 * for more details.

 *

 * Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>

 */



#include <linux/mm.h>

#include <linux/io.h>

#include <linux/serial_reg.h>



#include "devices.h"

#include "ar2315_regs.h"

#include "ar5312_regs.h"



static inline void prom_uart_wr(void __iomem *base, unsigned reg,

				unsigned char ch)

{

	__raw_writel(ch, base + 4 * reg);

}



static inline unsigned char prom_uart_rr(void __iomem *base, unsigned reg)

{

	return __raw_readl(base + 4 * reg);

}



void prom_putchar(unsigned char ch)

{

	static void __iomem *base;



	if (unlikely(base == NULL)) {

		if (is_ar2315())

			base = (void __iomem *)(KSEG1ADDR(AR2315_UART0_BASE));

		else

			base = (void __iomem *)(KSEG1ADDR(AR5312_UART0_BASE));

	}



	while ((prom_uart_rr(base, UART_LSR) & UART_LSR_THRE) == 0)

		;

	prom_uart_wr(base, UART_TX, ch);

	while ((prom_uart_rr(base, UART_LSR) & UART_LSR_THRE) == 0)

		;

}