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
17 static char console_port = 1;
18
serial_in(int offset,unsigned int base_addr)19 static inline unsigned int serial_in(int offset, unsigned int base_addr)
20 {
21 return __raw_readl(PORT(base_addr, offset)) & 0xff;
22 }
23
serial_out(int offset,int value,unsigned int base_addr)24 static inline void serial_out(int offset, int value, unsigned int base_addr)
25 {
26 __raw_writel(value, PORT(base_addr, offset));
27 }
28
fw_init_early_console(char port)29 void __init fw_init_early_console(char port)
30 {
31 console_port = port;
32 }
33
prom_putchar(char c)34 int 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