ARM·Nand Flash的控制
static void s3c2440_write_addr_lp(unsigned int addr)
{
int i;
volatile unsigned char *p = (volatile unsigned char *)&s3c2440nand->NFADDR;
int col, page;
col = addr & NAND_BLOCK_MASK_LP;
page = addr / NAND_SECTOR_SIZE_LP;
*p = col & 0xff;
for(i=0; i<10; i++);
*p = (col >> 8) & 0x0f;
for(i=0; i<10; i++);
*p = page & 0xff;
for(i=0; i<10; i++);
*p = (page >> 8) & 0xff;
for(i=0; i<10; i++);
*p = (page >> 16) & 0x03;
for(i=0; i<10; i++);
}
static unsigned char s3c2440_read_data(void)
{
volatile unsigned char *p = (volatile unsigned char *)&s3c2440nand->NFDATA;
return *p;
}
static void nand_reset(void)
{
nand_chip.nand_reset();
}
static void wait_idle(void)
{
nand_chip.wait_idle();
}
static void nand_select_chip(void)
{
int i;
nand_chip.nand_select_chip();
for(i=0; i<10; i++);
}
static void nand_deselect_chip(void)
{
nand_chip.nand_deselect_chip();
}
static void write_cmd(int cmd)
{
nand_chip.write_cmd(cmd);
}
static void write_addr(unsigned int addr)
{
nand_chip.write_addr(addr);
}
static unsigned char read_data(void)
{
return nand_chip.read_data();
}
void nand_init(void)
{
#define TACLS
0
#define TWRPH0
3
#define TWRPH1
0
if ((GSTATUS1 == 0x32410000) || (GSTATUS1 == 0x32410002))
{
nand_chip.nand_reset
= s3c2410_nand_reset;
nand_chip.wait_idle
= s3c2410_wait_idle;
nand_chip.nand_select_chip
= s3c2410_nand_select_chip;
nand_chip.nand_deselect_chip = s3c2410_nand_deselect_chip;
nand_chip.write_cmd
= s3c2410_write_cmd;
nand_chip.write_addr
= s3c2410_write_addr;
nand_chip.read_data
= s3c2410_read_data;
s3c2410nand->NFCONF = (1<<15)|(1<<12)|(1<<11)|(TACLS<<8)|(TWRPH0<<4)|(TWRPH1<<0);
}
else
{
nand_chip.nand_reset
= s3c2440_nand_reset;
nand_chip.wait_idle
= s3c2440_wait_idle;
nand_chip.nand_select_chip
= s3c2440_nand_select_chip;
nand_chip.nand_deselect_chip = s3c2440_nand_deselect_chip;
nand_chip.write_cmd
= s3c2440_write_cmd;
#ifdef LARGER_NAND_PAGE
nand_chip.write_addr
= s3c2440_write_addr_lp;
#else
nand_chip.write_addr = s3c2440_write_addr;
#endif
nand_chip.read_data
= s3c2440_read_data;
s3c2440nand->NFCONF = (TACLS<<12)|(TWRPH0<<8)|(TWRPH1<<4);