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_LOONGSON64) || 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