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onenand.c

/*
 * (C) Copyright 2005 Samsung Electronis
 * Kyungmin Park <kyungmin.park@samsung.com>
 *
 * 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>

#include <asm/string.h>

#include "onenand_regs.h"

#define onenand_readw(a)      (*(volatile unsigned short *)(a))
#define onenand_writew(v, a)  ((*(volatile unsigned short *)(a)) = (u16) (v))

#define SAMSUNG_MFR_ID        0xEC
#define KFM1G16Q2A_DEV_ID     0x30
#define KFN2G16Q2A_DEV_ID     0x40

#ifdef CFG_ONENAND

#define THIS_ONENAND(a)       (ONENAND_ADDR + (a))

#define READ_INTERRUPT()                                    \
      onenand_readw(THIS_ONENAND(ONENAND_REG_INTERRUPT))

#define SET_EMIFS_CS_CONFIG(v)                              \
      (*(volatile unsigned long *)(OMAP_EMIFS_CS_CONFIG) = (v))

#define onenand_block_address(block)            (block)
#define onenand_sector_address(page)            (page << 2)
#define onenand_buffer_address()          ((1 << 3) << 8)
#define onenand_bufferram_address(block)  (0)

#if defined(CFG_SYNC_BURST_READ) && defined(CONFIG_OMAP1610)
static inline void set_sync_burst_read(void)
{
      unsigned int value;
      value = 0
            | (0x1 << 15)           /* Read Mode: Synchronous */
            | (0x4 << 12)           /* Burst Read Latency: 4 cycles */
            | (0x4 << 9)            /* Burst Length: 8 word */
            | (0x1 << 7)            /* RDY signal plarity */
            | (0x1 << 6)            /* INT signal plarity */
            | (0x1 << 5)            /* I/O buffer enable */
            ;
      onenand_writew(value, THIS_ONENAND(ONENAND_REG_SYS_CFG1));

      value = 0
            | (4 << 16)       /* Synchronous Burst Read */
            | (1 << 12)       /* PGWST/WELEN */
            | (1 << 8)        /* WRWST */
            | (4 << 4)        /* RDWST */
            | (1 << 0)        /* FCLKDIV => 48MHz */
            ;
      SET_EMIFS_CS_CONFIG(value);
}

static inline void set_async_read(void)
{
      unsigned int value;
      value = 0
            | (0x0 << 15)           /* Read Mode: Asynchronous */
            | (0x4 << 12)           /* Burst Read Latency: 4 cycles */
            | (0x0 << 9)            /* Burst Length: continuous */
            | (0x1 << 7)            /* RDY signal plarity */
            | (0x1 << 6)            /* INT signal plarity */
            | (0x0 << 5)            /* I/O buffer disable */
            ;
      onenand_writew(value, THIS_ONENAND(ONENAND_REG_SYS_CFG1));

      value = 0
            | (0 << 16)       /* Asynchronous Read */
            | (1 << 12)       /* PGWST/WELEN */
            | (1 << 8)        /* WRWST */
            | (3 << 4)        /* RDWST */
            | (1 << 0)        /* FCLKDIV => 48MHz */
            ;
      SET_EMIFS_CS_CONFIG(value);
}
#else
#define set_sync_burst_read(...)    do { } while (0)
#define set_async_read(...)         do { } while (0)
#endif

int
onenand_chip()
{
      unsigned short mf_id, dev_id;
      mf_id = (*(volatile unsigned short *)(THIS_ONENAND(ONENAND_REG_MANUFACTURER_ID)));
      dev_id = (*(volatile unsigned short *)(THIS_ONENAND(ONENAND_REG_DEVICE_ID)));
      
      if(mf_id == SAMSUNG_MFR_ID) {
            if (dev_id == KFM1G16Q2A_DEV_ID) {
                  printf("Detected Samsung MuxOneNAND1G Flash \r\n");
                  return 0;
            } else if (dev_id == KFN2G16Q2A_DEV_ID) {
                  printf("Detected Samsung MuxOneNAND2G Flash \r\n");
                        return 0;
            } else {
                  printf(" ONENAND Flash unsupported\r\n");
                        return 1;
            }
      } else {
            printf("ONENAND Flash Unsupported\r\n");
            return 1;
      }
}

/* read a page with ECC */
static inline int onenand_read_page(ulong block, ulong page, u_char *buf)
{
      unsigned long *base;

#ifndef __HAVE_ARCH_MEMCPY32
      unsigned int offset, value;
      unsigned long *p;
#endif

      onenand_writew(onenand_block_address(block),
            THIS_ONENAND(ONENAND_REG_START_ADDRESS1));

      onenand_writew(onenand_sector_address(page),
            THIS_ONENAND(ONENAND_REG_START_ADDRESS8));

      onenand_writew(onenand_buffer_address(),
            THIS_ONENAND(ONENAND_REG_START_BUFFER));

      onenand_writew(onenand_bufferram_address(block),
            THIS_ONENAND(ONENAND_REG_START_ADDRESS2));

      onenand_writew(ONENAND_INT_CLEAR, THIS_ONENAND(ONENAND_REG_INTERRUPT));

      onenand_writew(ONENAND_CMD_READ, THIS_ONENAND(ONENAND_REG_COMMAND));

#ifndef __HAVE_ARCH_MEMCPY32
      p = (unsigned long *) buf;
#endif
      base = (unsigned long *) (ONENAND_ADDR + ONENAND_DATARAM);

      while (!(READ_INTERRUPT() & ONENAND_INT_MASTER))
            continue;

#ifdef __HAVE_ARCH_MEMCPY32
      /* 32 bytes boundary memory copy */
      memcpy32(buf, base, ONENAND_PAGE_SIZE);
#else
      for (offset = 0; offset < (ONENAND_PAGE_SIZE >> 2); offset++) {
            value = *(base + offset);
            *p++ = value;
      }
#endif

      return 0;
}

#define ONENAND_START_PAGE          0
#define ONENAND_PAGES_PER_BLOCK           64

/**
 * onenand_read_block - Read a block data to buf
 * @return 0 on sucess
 */ 

int onenand_read_block(unsigned char *buf, ulong block)
{
      int page, offset = 0;

      set_sync_burst_read();

      /* NOTE: you must read page from page 1 of block 0 */
      /* read the block page by page*/
      for (page = ONENAND_START_PAGE;
          page < ONENAND_PAGES_PER_BLOCK; page++) {

            onenand_read_page(block, page, buf + offset);

            offset += ONENAND_PAGE_SIZE;
      }

      set_async_read();

      return 0;
}

#endif /* CFG_ONENAND */

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