47 строки
1.2 KiB
C
47 строки
1.2 KiB
C
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
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*/
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#include <linux/init.h>
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#include <linux/console.h>
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#include <linux/serial_reg.h>
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#include <linux/io.h>
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#define SEAD_UART1_REGS_BASE 0xbf000800 /* ttyS1 = DB9 port */
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#define SEAD_UART0_REGS_BASE 0xbf000900 /* ttyS0 = USB port */
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#define PORT(base_addr, offset) ((unsigned int __iomem *)(base_addr+(offset)*4))
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static char console_port = 1;
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static inline unsigned int serial_in(int offset, unsigned int base_addr)
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{
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return __raw_readl(PORT(base_addr, offset)) & 0xff;
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}
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static inline void serial_out(int offset, int value, unsigned int base_addr)
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{
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__raw_writel(value, PORT(base_addr, offset));
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}
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void __init prom_init_early_console(char port)
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{
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console_port = port;
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}
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int prom_putchar(char c)
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{
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unsigned int base_addr;
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base_addr = console_port ? SEAD_UART1_REGS_BASE : SEAD_UART0_REGS_BASE;
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while ((serial_in(UART_LSR, base_addr) & UART_LSR_THRE) == 0)
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;
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serial_out(UART_TX, c, base_addr);
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return 1;
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}
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