UART.rar_linux uart_s3c2410 linux uart

#include "s3c2410.h" /* SDRAM 13个寄存器的值 */ unsigned long const mem_cfg_val[]={ 0x22111110, //BWSCON 0x00000700, //BANKCON0 0x00000700, //BANKCON1 0x00000700, //BANKCON2 0x00000700, //BANKCON3 0x00000700, //BANKCON4 0x00000700, //BANKCON5 0x00018005, //BANKCON6 0x00018005, //BANKCON7 0x008e07a3, //REFRESH 0x000000b2, //BANKSIZE 0x00000030, //MRSRB6 0x00000030, //MRSRB7 }; void disable_watch_dog(); void memsetup(); void reset_nand(); void init_nand(); inline void wait_idle(void); void nand_read_ll(unsigned char *buf, unsigned long start_addr, int size); void init_uart(); /*上电后，WATCH DOG默认是开着的，要把它关掉 */ void disable_watch_dog() { WTCON = 0; } /* 设置控制SDRAM的13个寄存器 */ void memsetup() { int i = 0; unsigned long *p = (unsigned long *)MEM_CTL_BASE; for(; i < 13; i++) p[i] = mem_cfg_val[i]; } /* 在第一次实用NAND Flash前，复位一下NAND Flash */ void reset_nand() { int i=0; NFCONF &= ~0x800; for(; i<10; i++); NFCMD = 0xff; //reset command wait_idle(); } /* 初始化NAND Flash */ void init_nand() { NFCONF = 0xf830; reset_nand(); } /************************************************************************* * 以下读NAND Flash的代码来自mizi公司的bootloader vivi *************************************************************************/ #define BUSY 1 inline void wait_idle(void) { int i; while(!(NFSTAT & BUSY)) for(i=0; i<10; i++); } #define NAND_SECTOR_SIZE 512 #define NAND_BLOCK_MASK (NAND_SECTOR_SIZE - 1) /* low level nand read function */ void nand_read_ll(unsigned char *buf, unsigned long start_addr, int size) { int i, j; if ((start_addr & NAND_BLOCK_MASK) || (size & NAND_BLOCK_MASK)) { return ; /* invalid alignment */ } /* chip Enable */ NFCONF &= ~0x800; for(i=0; i<10; i++); for(i=start_addr; i < (start_addr + size);) { /* READ0 */ NFCMD = 0; /* Write Address */ NFADDR = i & 0xff; NFADDR = (i >> 9) & 0xff; NFADDR = (i >> 17) & 0xff; NFADDR = (i >> 25) & 0xff; wait_idle(); for(j=0; j < NAND_SECTOR_SIZE; j++, i++) { *buf = (NFDATA & 0xff); buf++; } } /* chip Disable */ NFCONF |= 0x800; /* chip disable */ return ; }