/* * 16550 compatible uart based serial debug support for zboot */ #include <linux/types.h> #include <linux/serial_reg.h> #include <linux/init.h> #include <asm/addrspace.h> #if defined(CONFIG_MACH_LOONGSON) || defined(CONFIG_MIPS_MALTA) #define UART_BASE 0x1fd003f8 #define PORT(offset) (CKSEG1ADDR(UART_BASE) + (offset)) #endif #ifdef CONFIG_AR7 #include <ar7.h> #define PORT(offset) (CKSEG1ADDR(AR7_REGS_UART0) + (4 * offset)) #endif #ifndef PORT #error please define the serial port address for your own machine #endif static inline unsigned int serial_in(int offset) { return *((char *)PORT(offset)); } static inline void serial_out(int offset, int value) { *((char *)PORT(offset)) = value; } void putc(char c) { int timeout = 1024; while (((serial_in(UART_LSR) & UART_LSR_THRE) == 0) && (timeout-- > 0)) ; serial_out(UART_TX, c); }