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30 lines
847 B
C
30 lines
847 B
C
/*
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* Ralink RT3662/RT3883 SoC early printk support
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*
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* Copyright (C) 2011-2012 Gabor Juhos <juhosg@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-ralink/rt3883_regs.h>
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#define UART_READ(r) \
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__raw_readl((void __iomem *)(KSEG1ADDR(RT3883_UART1_BASE) + 4 * (r)))
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#define UART_WRITE(r, v) \
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__raw_writel((v), (void __iomem *)(KSEG1ADDR(RT3883_UART1_BASE) + 4 * (r)))
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void prom_putchar(unsigned char ch)
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{
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while (((UART_READ(RT3883_UART_REG_LSR)) & UART_LSR_THRE) == 0);
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UART_WRITE(RT3883_UART_REG_TX, ch);
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while (((UART_READ(RT3883_UART_REG_LSR)) & UART_LSR_THRE) == 0);
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}
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