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 
8 #include <asm/addrspace.h>
9 
10 #if defined(CONFIG_MACH_LOONGSON) || defined(CONFIG_MIPS_MALTA)
11 #define UART_BASE 0x1fd003f8
12 #define PORT(offset) (CKSEG1ADDR(UART_BASE) + (offset))
13 #endif
14 
15 #ifdef CONFIG_AR7
16 #include <ar7.h>
17 #define PORT(offset) (CKSEG1ADDR(AR7_REGS_UART0) + (4 * offset))
18 #endif
19 
20 #ifdef CONFIG_MACH_JZ4740
21 #include <asm/mach-jz4740/base.h>
22 #define PORT(offset) (CKSEG1ADDR(JZ4740_UART0_BASE_ADDR) + (4 * offset))
23 #endif
24 
25 #ifdef CONFIG_CPU_XLR
26 #define UART0_BASE  0x1EF14000
27 #define PORT(offset) (CKSEG1ADDR(UART0_BASE) + (4 * offset))
28 #define IOTYPE unsigned int
29 #endif
30 
31 #ifdef CONFIG_CPU_XLP
32 #define UART0_BASE  0x18030100
33 #define PORT(offset) (CKSEG1ADDR(UART0_BASE) + (4 * offset))
34 #define IOTYPE unsigned int
35 #endif
36 
37 #ifndef IOTYPE
38 #define IOTYPE char
39 #endif
40 
41 #ifndef PORT
42 #error please define the serial port address for your own machine
43 #endif
44 
45 static inline unsigned int serial_in(int offset)
46 {
47 	return *((volatile IOTYPE *)PORT(offset)) & 0xFF;
48 }
49 
50 static inline void serial_out(int offset, int value)
51 {
52 	*((volatile IOTYPE *)PORT(offset)) = value & 0xFF;
53 }
54 
55 void putc(char c)
56 {
57 	int timeout = 1000000;
58 
59 	while (((serial_in(UART_LSR) & UART_LSR_THRE) == 0) && (timeout-- > 0))
60 		;
61 
62 	serial_out(UART_TX, c);
63 }
64