1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License.  See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2012 MIPS Technologies, Inc.  All rights reserved.
7 */
8#include <linux/init.h>
9#include <linux/console.h>
10#include <linux/serial_reg.h>
11#include <linux/io.h>
12
13#define SEAD_UART1_REGS_BASE	0xbf000800   /* ttyS1 = DB9 port */
14#define SEAD_UART0_REGS_BASE	0xbf000900   /* ttyS0 = USB port   */
15#define PORT(base_addr, offset) ((unsigned int __iomem *)(base_addr+(offset)*4))
16
17static char console_port = 1;
18
19static inline unsigned int serial_in(int offset, unsigned int base_addr)
20{
21	return __raw_readl(PORT(base_addr, offset)) & 0xff;
22}
23
24static inline void serial_out(int offset, int value, unsigned int base_addr)
25{
26	__raw_writel(value, PORT(base_addr, offset));
27}
28
29void __init fw_init_early_console(char port)
30{
31	console_port = port;
32}
33
34int prom_putchar(char c)
35{
36	unsigned int base_addr;
37
38	base_addr = console_port ? SEAD_UART1_REGS_BASE : SEAD_UART0_REGS_BASE;
39
40	while ((serial_in(UART_LSR, base_addr) & UART_LSR_THRE) == 0)
41		;
42
43	serial_out(UART_TX, c, base_addr);
44
45	return 1;
46}
47