static void reset_nandflash(void)
{
NAND_ENABLE_CE();
WRITE_NAND_COMMAND(0xFF);
NAND_WAIT_READY();
NAND_WAIT_READY();
NAND_DISABLE_CE();
}
static int ifx_nand_ready(struct mtd_info *mtd)
{
struct nand_chip *nand = mtd->priv;
NAND_WAIT_READY(nand);
return 1;
}
/* read from the 16 bytes of oob data that correspond to a 512 byte page.
*/
static int nand_read_oob(u_char *buf, ulong page_addr)
{
u16 val;
int cntr;
NAND_ENABLE_CE(); /* set pin low */
NanD_Command(NAND_CMD_READOOB);
NanD_Address(ADDR_COLUMN_PAGE, page_addr>>1);
NAND_WAIT_READY();
for (cntr = 0; cntr < 8; cntr++){
val = READ_NAND(NAND_ADDR);
*buf++ = val & 0xff;
*buf++ = val >> 8;
}
NAND_WAIT_READY();
NAND_DISABLE_CE(); /* set pin high */
return 0;
}
/* read a page with ECC */
static int nand_read_page(u_char *buf, ulong page_addr)
{
u_char ecc_code[6];
u_char ecc_calc[3];
u_char oob_buf[16];
u_char *p;
u16 val;
int cntr;
NAND_ENABLE_CE();
NanD_Command(NAND_CMD_READ0);
NanD_Address(ADDR_COLUMN_PAGE, page_addr>>1);
NAND_WAIT_READY();
p = buf;
for (cntr = 0; cntr < 256; cntr++){
val = READ_NAND(NAND_ADDR);
*p++ = val & 0xff;
*p++ = val >> 8;
}
p = oob_buf;
for (cntr = 0; cntr < 8; cntr++){
val = READ_NAND(NAND_ADDR);
*p++ = val & 0xff;
*p++ = val >> 8;
}
NAND_DISABLE_CE(); /* set pin high */
/* Pick the ECC bytes out of the oob data */
for (cntr = 0; cntr < 6; cntr++)
ecc_code[cntr] = oob_buf[ecc_pos[cntr]];
if ((oob_buf[eccvalid_pos] & 0x0f) != 0x0f) {
nand_calculate_ecc (buf, &ecc_calc[0]);
if (nand_correct_data (buf, &ecc_code[0], &ecc_calc[0]) == -1) {
printf ("ECC Failed, page 0x%08x\n", page_addr);
return 1;
}
}
if ((oob_buf[eccvalid_pos] & 0xf0) != 0xf0) {
nand_calculate_ecc (buf + 256, &ecc_calc[0]);
if (nand_correct_data (buf + 256, &ecc_code[3], &ecc_calc[0]) == -1) {
printf ("ECC Failed, page 0x%08x\n", page_addr+0x100);
return 1;
}
}
return 0;
}
/* NanD_Command: Send a flash command to the flash chip */
static int NanD_Command(unsigned char command)
{
NAND_CTL_SETCLE(NAND_ADDR);
WRITE_NAND_COMMAND(command, NAND_ADDR);
NAND_CTL_CLRCLE(NAND_ADDR);
if(command == NAND_CMD_RESET){
unsigned char ret_val;
NanD_Command(NAND_CMD_STATUS);
do{
ret_val = READ_NAND(NAND_ADDR);/* wait till ready */
} while((ret_val & 0x40) != 0x40);
}
NAND_WAIT_READY();
return 0;
}
/* NanD_Address: Set the current address for the flash chip */
static int NanD_Address(int numbytes, unsigned long ofs)
{
int i;
NAND_CTL_SETALE(NAND_ADDR);
if (numbytes == ADDR_COLUMN || numbytes == ADDR_COLUMN_PAGE)
WRITE_NAND_ADDRESS(ofs, NAND_ADDR);
ofs = ofs >> 8;
if (numbytes == ADDR_PAGE || numbytes == ADDR_COLUMN_PAGE)
for (i = 0; i < 2; i++, ofs = ofs >> 8)
WRITE_NAND_ADDRESS(ofs, NAND_ADDR);
NAND_CTL_CLRALE(NAND_ADDR);
NAND_WAIT_READY();
return 0;
}
