projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1b93b3c3 WZ |
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 | ||
| f9c9affc LBR |
21 | #ifdef CONFIG_MACH_JZ4740 |
| 22 | #define UART0_BASE 0xB0030000 | |
| 23 | #define PORT(offset) (UART0_BASE + (4 * offset)) | |
| 24 | #endif | |
| 25 | ||
| 1b93b3c3 WZ |
26 | #ifndef PORT |
| 27 | #error please define the serial port address for your own machine | |
| 28 | #endif | |
| 29 | ||
| 30 | static inline unsigned int serial_in(int offset) | |
| 31 | { | |
| 32 | return *((char *)PORT(offset)); | |
| 33 | } | |
| 34 | ||
| 35 | static inline void serial_out(int offset, int value) | |
| 36 | { | |
| 37 | *((char *)PORT(offset)) = value; | |
| 38 | } | |
| 39 | ||
| 40 | void putc(char c) | |
| 41 | { | |
| 42 | int timeout = 1024; | |
| 43 | ||
| 44 | while (((serial_in(UART_LSR) & UART_LSR_THRE) == 0) && (timeout-- > 0)) | |
| 45 | ; | |
| 46 | ||
| 47 | serial_out(UART_TX, c); | |
| 48 | } |