31 lines
853 B
C
31 lines
853 B
C
/*
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* Atheros AR71xx SoC early printk support
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*
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* Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
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* Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include <linux/io.h>
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#include <linux/serial_reg.h>
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#include <asm/addrspace.h>
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#include <asm/mach-ar71xx/ar71xx.h>
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#define UART_READ(r) \
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__raw_readl((void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4 * (r)))
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#define UART_WRITE(r, v) \
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__raw_writel((v), (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4*(r)))
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void prom_putchar(unsigned char ch)
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{
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while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
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UART_WRITE(UART_TX, ch);
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while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
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}
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