37 lines
862 B
C
37 lines
862 B
C
/*
|
|
* Atheros AR71XX/AR724X/AR913X SoC early printk support
|
|
*
|
|
* Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
|
|
* Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/io.h>
|
|
#include <linux/serial_reg.h>
|
|
#include <asm/addrspace.h>
|
|
|
|
#include <asm/mach-ath79/ar71xx_regs.h>
|
|
|
|
static inline void prom_wait_thre(void __iomem *base)
|
|
{
|
|
u32 lsr;
|
|
|
|
do {
|
|
lsr = __raw_readl(base + UART_LSR * 4);
|
|
if (lsr & UART_LSR_THRE)
|
|
break;
|
|
} while (1);
|
|
}
|
|
|
|
void prom_putchar(unsigned char ch)
|
|
{
|
|
void __iomem *base = (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE));
|
|
|
|
prom_wait_thre(base);
|
|
__raw_writel(ch, base + UART_TX * 4);
|
|
prom_wait_thre(base);
|
|
}
|