Ralf Baechle | a57c228 | 2007-11-04 04:49:44 +0000 | [diff] [blame] | 1 | #include <linux/console.h> |
| 2 | #include <linux/init.h> |
| 3 | #include <linux/serial_reg.h> |
| 4 | #include <asm/io.h> |
| 5 | |
| 6 | #define PORT(offset) (0x3f8 + (offset)) |
| 7 | |
| 8 | static inline unsigned int serial_in(int offset) |
| 9 | { |
| 10 | return inb(PORT(offset)); |
| 11 | } |
| 12 | |
| 13 | static inline void serial_out(int offset, int value) |
| 14 | { |
| 15 | outb(value, PORT(offset)); |
| 16 | } |
| 17 | |
| 18 | int prom_putchar(char c) |
| 19 | { |
| 20 | while ((serial_in(UART_LSR) & UART_LSR_THRE) == 0) |
| 21 | ; |
| 22 | |
| 23 | serial_out(UART_TX, c); |
| 24 | |
| 25 | return 1; |
| 26 | } |