tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * 16550 compatible uart based serial debug support for zboot
3 */
4
5#include <linux/types.h>
6#include <linux/serial_reg.h>
7#include <linux/init.h>
8
9#include <asm/addrspace.h>
10
11#if defined(CONFIG_MACH_LOONGSON) || defined(CONFIG_MIPS_MALTA)
12#define UART_BASE 0x1fd003f8
13#define PORT(offset) (CKSEG1ADDR(UART_BASE) + (offset))
14#endif
15
16#ifdef CONFIG_AR7
17#include <ar7.h>
18#define PORT(offset) (CKSEG1ADDR(AR7_REGS_UART0) + (4 * offset))
19#endif
20
21#ifndef PORT
22#error please define the serial port address for your own machine
23#endif
24
25static inline unsigned int serial_in(int offset)
26{
27 return *((char *)PORT(offset));
28}
29
30static inline void serial_out(int offset, int value)
31{
32 *((char *)PORT(offset)) = value;
33}
34
35void putc(char c)
36{
37 int timeout = 1024;
38
39 while (((serial_in(UART_LSR) & UART_LSR_THRE) == 0) && (timeout-- > 0))
40 ;
41
42 serial_out(UART_TX, c);
43}