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k9f5616.c

/*
 * (C) Copyright 2004 Texas Instruments
 * Jian Zhang <jzhang@ti.com>
 *
 *  Samsung K9F5616Q0C NAND chip driver for an OMAP16xx board
 * 
 * This file is based on the following u-boot file:
 *    common/cmd_nand.c
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>

#ifdef CFG_NAND_K9F5616

#define K9F5616_MFR           0xec
#define K9F5616_ID            0x45

#define ADDR_COLUMN           1          
#define ADDR_PAGE       2             
#define ADDR_COLUMN_PAGE      3

#define PAGE_SIZE       512

static int nand_read_page(u_char *buf, ulong page_addr);
static int nand_read_oob(u_char * buf, ulong page_addr);

/* JFFS2 512-byte-page ECC layout */
static u_char ecc_pos[] = {0,1,2,3,6,7};
static u_char eccvalid_pos = 4;

/* 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;
}

/* read chip mfr and id
 * return 0 if they match board config
 * return 1 if not
 */
int nand_chip()
{
      int mfr, id;

      NAND_ENABLE_CE();

      if (NanD_Command(NAND_CMD_RESET)) {
            printf("Err: RESET\n");
            NAND_DISABLE_CE();   
            return 1;
      }
 
      if (NanD_Command(NAND_CMD_READID)) {
            printf("Err: READID\n");
            NAND_DISABLE_CE();
            return 1;
      }
 
      NanD_Address(ADDR_COLUMN, 0);

      mfr = READ_NAND(NAND_ADDR);
      id = READ_NAND(NAND_ADDR);

      NAND_DISABLE_CE();

      return (mfr != K9F5616_MFR || id != K9F5616_ID);
}

/* read a block data to buf
 * return 1 if the block is bad or ECC error can't be corrected for any page
 * return 0 on sucess
 */ 
int nand_read_block(unsigned char *buf, ulong block_addr)
{
      int i, offset = 0;
      uchar oob_buf[16];
      
      /* check bad block */
      /* 0th and 5th words need be 0xffff */
      if (nand_read_oob(oob_buf, block_addr) ||
//          oob_buf[0] != 0xff || oob_buf[1] != 0xff ||
//          oob_buf[10] != 0xff || oob_buf[11] != 0xff ){
            oob_buf[5] != 0xff){
            printf("Skipped bad block at 0x%x\n", block_addr);
            return 1;    /* skip bad block */
      }

      /* read the block page by page*/
      for (i=0; i<32; i++){
            if (nand_read_page(buf+offset, block_addr + offset))
                  return 1;
            offset += PAGE_SIZE;
      }

      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;
}

/* 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;
}

#endif

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