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/arch/mips/boot/compressed/uart-16550.c

http://github.com/mirrors/linux
C | 64 lines | 46 code | 14 blank | 4 comment | 5 complexity | acbc8d35c552ea24a270b9b556a9eb1a MD5 | raw file
 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * 16550 compatible uart based serial debug support for zboot
 4 */
 5
 6#include <linux/types.h>
 7#include <linux/serial_reg.h>
 8
 9#include <asm/addrspace.h>
10
11#if defined(CONFIG_MACH_LOONGSON64) || 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#ifdef CONFIG_MACH_INGENIC
22#define INGENIC_UART0_BASE_ADDR	0x10030000
23#define PORT(offset) (CKSEG1ADDR(INGENIC_UART0_BASE_ADDR) + (4 * offset))
24#endif
25
26#ifdef CONFIG_CPU_XLR
27#define UART0_BASE  0x1EF14000
28#define PORT(offset) (CKSEG1ADDR(UART0_BASE) + (4 * offset))
29#define IOTYPE unsigned int
30#endif
31
32#ifdef CONFIG_CPU_XLP
33#define UART0_BASE  0x18030100
34#define PORT(offset) (CKSEG1ADDR(UART0_BASE) + (4 * offset))
35#define IOTYPE unsigned int
36#endif
37
38#ifndef IOTYPE
39#define IOTYPE char
40#endif
41
42#ifndef PORT
43#error please define the serial port address for your own machine
44#endif
45
46static inline unsigned int serial_in(int offset)
47{
48	return *((volatile IOTYPE *)PORT(offset)) & 0xFF;
49}
50
51static inline void serial_out(int offset, int value)
52{
53	*((volatile IOTYPE *)PORT(offset)) = value & 0xFF;
54}
55
56void putc(char c)
57{
58	int timeout = 1000000;
59
60	while (((serial_in(UART_LSR) & UART_LSR_THRE) == 0) && (timeout-- > 0))
61		;
62
63	serial_out(UART_TX, c);
64}