Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
sead3-console.c
Go to the documentation of this file.
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 
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 
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 
30 {
31  console_port = port;
32 }
33 
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 }