sead3-console.c
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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
*/
#include <linux/init.h>
#include <linux/console.h>
#include <linux/serial_reg.h>
#include <linux/io.h>
#define SEAD_UART1_REGS_BASE 0xbf000800 /* ttyS1 = DB9 port */
#define SEAD_UART0_REGS_BASE 0xbf000900 /* ttyS0 = USB port */
#define PORT(base_addr, offset) ((unsigned int __iomem *)(base_addr+(offset)*4))
static char console_port = 1;
static inline unsigned int serial_in(int offset, unsigned int base_addr)
{
return __raw_readl(PORT(base_addr, offset)) & 0xff;
}
static inline void serial_out(int offset, int value, unsigned int base_addr)
{
__raw_writel(value, PORT(base_addr, offset));
}
void __init fw_init_early_console(char port)
{
console_port = port;
}
int prom_putchar(char c)
{
unsigned int base_addr;
base_addr = console_port ? SEAD_UART1_REGS_BASE : SEAD_UART0_REGS_BASE;
while ((serial_in(UART_LSR, base_addr) & UART_LSR_THRE) == 0)
;
serial_out(UART_TX, c, base_addr);
return 1;
}