mirror of https://gitee.com/openkylin/linux.git
37 lines
862 B
C
37 lines
862 B
C
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/*
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* Atheros AR71XX/AR724X/AR913X SoC early printk support
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*
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* Copyright (C) 2008-2010 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-ath79/ar71xx_regs.h>
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static inline void prom_wait_thre(void __iomem *base)
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{
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u32 lsr;
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do {
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lsr = __raw_readl(base + UART_LSR * 4);
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if (lsr & UART_LSR_THRE)
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break;
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} while (1);
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}
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void prom_putchar(unsigned char ch)
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{
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void __iomem *base = (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE));
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prom_wait_thre(base);
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__raw_writel(ch, base + UART_TX * 4);
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prom_wait_thre(base);
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}
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