arch/s3c2440/nand_read.c File Reference

Go to the source code of this file.

Functions
void	wait_idle (void)
void	PrintChar (char msg)
int	nand_block_checkbad_ll (unsigned long addr)
int	nand_read_ll (unsigned char *buf, unsigned long start_addr, int size)

---

Function Documentation

int nand_block_checkbad_ll

(

unsigned long

addr

)

Definition at line 119 of file nand_read.c.

{
    int i;
    //char data;

    /* READOOB */
    NAND_CLEAR_RB;
#ifndef LARGEPAGE_FLASH
    NFCMD = NAND_CMD_READOOB;
#else
    NFCMD = NAND_CMD_READ0;../../include/
#endif

    /* Write Address */
#ifndef LARGEPAGE_FLASH
      addr &= ~0x3fff;
      NFADDR = 5;
      NFADDR = (addr >> 9) & 0xff;
      NFADDR = (addr >> 17) & 0xff;
      NFADDR = (addr >> 25) & 0xff;
#else
      addr &= ~0x1ffff;

      NFADDR = 0;
      NFADDR = 0x08;
      NFADDR = (addr >> 11) & 0xff;
      NFADDR = (addr >> 19) & 0xff;
      NFADDR = (addr >> 27) & 0x3;

      NFCMD = NAND_CMD_READSTART;
#endif

    NAND_DETECT_RB;
    for (i=0;i<1000;i++);

    if ((NFDATA & 0xff)!=0xff) {
      return 1;
    }
    return 0;
}

int nand_read_ll	(	unsigned char *	buf,
		unsigned long	start_addr,
		int	size
	)

Definition at line 66 of file nand_read.c.

{
  int j, n;
  unsigned long addr,baddr;

  //PrintChar('r');
  
  if ((start_addr & NAND_BLOCK_MASK)/* || (size & NAND_BLOCK_MASK)*/) {
    return -1;  /* invalid alignment */
  }

  NAND_CHIP_ENABLE;

  baddr=start_addr;
  while(size>0) {
    if (!nand_block_checkbad_ll(baddr)) {
      for (j=0;j<size;j+=NAND_SECTOR_SIZE) {
        /* READ0 */
        NAND_CLEAR_RB;
        NFCMD = NAND_CMD_READ0;
    
        addr = baddr+j;
        /* Write Address */
#ifndef LARGEPAGE_FLASH
        NFADDR = addr & 0xff;
        NFADDR = (addr >> 9) & 0xff;
        NFADDR = (addr >> 17) & 0xff;
        NFADDR = (addr >> 25) & 0xff;
#else
        NFADDR = addr & 0xff;
        NFADDR = (addr >> 8) & 0x07;
        NFADDR = (addr >> 11) & 0xff;
        NFADDR = (addr >> 19) & 0xff;
        NFADDR = (addr >> 27) & 0x3;
  
        NFCMD = NAND_CMD_READSTART;
#endif
        NAND_DETECT_RB;
    
        for(n=0; n<NAND_SECTOR_SIZE; n++) {
          *buf = (NFDATA & 0xff);
          buf++;
        }
      }
      size -= j;
    } //else PrintChar('e');
    baddr += (BYTESPERSPAGE*PAGESPERSBLOCK);
  }
  NAND_CHIP_DISABLE;
  return 0;
}

void PrintChar

(

char

msg

)

void wait_idle

(

void

)

[inline]

Definition at line 34 of file nand_read.c.

                            {
  while(!(NFSTAT & BUSY));
  NFSTAT |= BUSY;
}