#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 ;
}