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80 lines
1.9 KiB
80 lines
1.9 KiB
20 years ago
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/*
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* Carsten Langgaard, carstenl@mips.com
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* Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
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*
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* This program is free software; you can distribute it and/or modify it
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* under the terms of the GNU General Public License (Version 2) as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
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*
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* Putting things on the screen/serial line using YAMONs facilities.
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*/
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#include <linux/config.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/serial_reg.h>
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#include <linux/spinlock.h>
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#include <asm/io.h>
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#ifdef CONFIG_MIPS_ATLAS
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#include <asm/mips-boards/atlas.h>
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#ifdef CONFIG_CPU_LITTLE_ENDIAN
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#define PORT(offset) (ATLAS_UART_REGS_BASE + ((offset)<<3))
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#else
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#define PORT(offset) (ATLAS_UART_REGS_BASE + 3 + ((offset)<<3))
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#endif
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#elif defined(CONFIG_MIPS_SEAD)
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#include <asm/mips-boards/sead.h>
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#ifdef CONFIG_CPU_LITTLE_ENDIAN
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#define PORT(offset) (SEAD_UART0_REGS_BASE + ((offset)<<3))
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#else
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#define PORT(offset) (SEAD_UART0_REGS_BASE + 3 + ((offset)<<3))
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#endif
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#else
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#define PORT(offset) (0x3f8 + (offset))
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#endif
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static inline unsigned int serial_in(int offset)
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{
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return inb(PORT(offset));
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}
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static inline void serial_out(int offset, int value)
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{
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outb(value, PORT(offset));
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}
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int prom_putchar(char c)
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{
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while ((serial_in(UART_LSR) & UART_LSR_THRE) == 0)
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;
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serial_out(UART_TX, c);
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return 1;
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}
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char prom_getchar(void)
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{
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while (!(serial_in(UART_LSR) & UART_LSR_DR))
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;
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return serial_in(UART_RX);
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}
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