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cfi_flash.c

/*
 * (C) Copyright 2002-2004
 * Brad Kemp, Seranoa Networks, Brad.Kemp@seranoa.com
 *
 * Copyright (C) 2003 Arabella Software Ltd.
 * Yuli Barcohen <yuli@arabellasw.com>
 *
 * Copyright (C) 2004
 * Ed Okerson
 *
 * Copyright (C) 2006
 * Tolunay Orkun <listmember@orkun.us>
 *
 * 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
 *
 */

/* The DEBUG define must be before common to enable debugging */
/* #define DEBUG  */

#include <common.h>
#include <asm/processor.h>
#include <asm/io.h>
#include <asm/byteorder.h>
#include <environment.h>
#include <mtd/cfi_flash.h>

/*
 * This file implements a Common Flash Interface (CFI) driver for
 * U-Boot.
 *
 * The width of the port and the width of the chips are determined at
 * initialization.  These widths are used to calculate the address for
 * access CFI data structures.
 *
 * References
 * JEDEC Standard JESD68 - Common Flash Interface (CFI)
 * JEDEC Standard JEP137-A Common Flash Interface (CFI) ID Codes
 * Intel Application Note 646 Common Flash Interface (CFI) and Command Sets
 * Intel 290667-008 3 Volt Intel StrataFlash Memory datasheet
 * AMD CFI Specification, Release 2.0 December 1, 2001
 * AMD/Spansion Application Note: Migration from Single-byte to Three-byte
 *   Device IDs, Publication Number 25538 Revision A, November 8, 2001
 *
 * Define CONFIG_SYS_WRITE_SWAPPED_DATA, if you have to swap the Bytes between
 * reading and writing ... (yes there is such a Hardware).
 */

#ifndef CONFIG_SYS_FLASH_BANKS_LIST
#define CONFIG_SYS_FLASH_BANKS_LIST { CONFIG_SYS_FLASH_BASE }
#endif

static uint flash_offset_cfi[2] = { FLASH_OFFSET_CFI, FLASH_OFFSET_CFI_ALT };
static uint flash_verbose = 1;

/* use CONFIG_SYS_MAX_FLASH_BANKS_DETECT if defined */
#ifdef CONFIG_SYS_MAX_FLASH_BANKS_DETECT
# define CFI_MAX_FLASH_BANKS  CONFIG_SYS_MAX_FLASH_BANKS_DETECT
#else
# define CFI_MAX_FLASH_BANKS  CONFIG_SYS_MAX_FLASH_BANKS
#endif

flash_info_t flash_info[CFI_MAX_FLASH_BANKS];   /* FLASH chips info */

/*
 * Check if chip width is defined. If not, start detecting with 8bit.
 */
#ifndef CONFIG_SYS_FLASH_CFI_WIDTH
#define CONFIG_SYS_FLASH_CFI_WIDTH  FLASH_CFI_8BIT
#endif

static void __flash_write8(u8 value, void *addr)
{
      __raw_writeb(value, addr);
}

static void __flash_write16(u16 value, void *addr)
{
      __raw_writew(value, addr);
}

static void __flash_write32(u32 value, void *addr)
{
      __raw_writel(value, addr);
}

static void __flash_write64(u64 value, void *addr)
{
      /* No architectures currently implement __raw_writeq() */
      *(volatile u64 *)addr = value;
}

static u8 __flash_read8(void *addr)
{
      return __raw_readb(addr);
}

static u16 __flash_read16(void *addr)
{
      return __raw_readw(addr);
}

static u32 __flash_read32(void *addr)
{
      return __raw_readl(addr);
}

static u64 __flash_read64(void *addr)
{
      /* No architectures currently implement __raw_readq() */
      return *(volatile u64 *)addr;
}

#ifdef CONFIG_CFI_FLASH_USE_WEAK_ACCESSORS
void flash_write8(u8 value, void *addr)__attribute__((weak, alias("__flash_write8")));
void flash_write16(u16 value, void *addr)__attribute__((weak, alias("__flash_write16")));
void flash_write32(u32 value, void *addr)__attribute__((weak, alias("__flash_write32")));
void flash_write64(u64 value, void *addr)__attribute__((weak, alias("__flash_write64")));
u8 flash_read8(void *addr)__attribute__((weak, alias("__flash_read8")));
u16 flash_read16(void *addr)__attribute__((weak, alias("__flash_read16")));
u32 flash_read32(void *addr)__attribute__((weak, alias("__flash_read32")));
u64 flash_read64(void *addr)__attribute__((weak, alias("__flash_read64")));
#else
#define flash_write8    __flash_write8
#define flash_write16   __flash_write16
#define flash_write32   __flash_write32
#define flash_write64   __flash_write64
#define flash_read8     __flash_read8
#define flash_read16    __flash_read16
#define flash_read32    __flash_read32
#define flash_read64    __flash_read64
#endif

/*-----------------------------------------------------------------------
 */
#if defined(CONFIG_ENV_IS_IN_FLASH) || defined(CONFIG_ENV_ADDR_REDUND) || (CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE)
flash_info_t *flash_get_info(ulong base)
{
      int i;
      flash_info_t * info = 0;

      for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
            info = & flash_info[i];
            if (info->size && info->start[0] <= base &&
                base <= info->start[0] + info->size - 1)
                  break;
      }

      return i == CONFIG_SYS_MAX_FLASH_BANKS ? 0 : info;
}
#endif

unsigned long flash_sector_size(flash_info_t *info, flash_sect_t sect)
{
      if (sect != (info->sector_count - 1))
            return info->start[sect + 1] - info->start[sect];
      else
            return info->start[0] + info->size - info->start[sect];
}

/*-----------------------------------------------------------------------
 * create an address based on the offset and the port width
 */
static inline void *
flash_map (flash_info_t * info, flash_sect_t sect, uint offset)
{
      unsigned int byte_offset = offset * info->portwidth;

      return (void *)(info->start[sect] + byte_offset);
}

static inline void flash_unmap(flash_info_t *info, flash_sect_t sect,
            unsigned int offset, void *addr)
{
}

/*-----------------------------------------------------------------------
 * make a proper sized command based on the port and chip widths
 */
static void flash_make_cmd(flash_info_t *info, u32 cmd, void *cmdbuf)
{
      int i;
      int cword_offset;
      int cp_offset;
#if defined(__LITTLE_ENDIAN) || defined(CONFIG_SYS_WRITE_SWAPPED_DATA)
      u32 cmd_le = cpu_to_le32(cmd);
#endif
      uchar val;
      uchar *cp = (uchar *) cmdbuf;

      for (i = info->portwidth; i > 0; i--){
            cword_offset = (info->portwidth-i)%info->chipwidth;
#if defined(__LITTLE_ENDIAN) || defined(CONFIG_SYS_WRITE_SWAPPED_DATA)
            cp_offset = info->portwidth - i;
            val = *((uchar*)&cmd_le + cword_offset);
#else
            cp_offset = i - 1;
            val = *((uchar*)&cmd + sizeof(u32) - cword_offset - 1);
#endif
            cp[cp_offset] = (cword_offset >= sizeof(u32)) ? 0x00 : val;
      }
}

#ifdef DEBUG
/*-----------------------------------------------------------------------
 * Debug support
 */
static void print_longlong (char *str, unsigned long long data)
{
      int i;
      char *cp;

      cp = (char *) &data;
      for (i = 0; i < 8; i++)
            sprintf (&str[i * 2], "%2.2x", *cp++);
}

static void flash_printqry (struct cfi_qry *qry)
{
      u8 *p = (u8 *)qry;
      int x, y;

      for (x = 0; x < sizeof(struct cfi_qry); x += 16) {
            debug("%02x : ", x);
            for (y = 0; y < 16; y++)
                  debug("%2.2x ", p[x + y]);
            debug(" ");
            for (y = 0; y < 16; y++) {
                  unsigned char c = p[x + y];
                  if (c >= 0x20 && c <= 0x7e)
                        debug("%c", c);
                  else
                        debug(".");
            }
            debug("\n");
      }
}
#endif


/*-----------------------------------------------------------------------
 * read a character at a port width address
 */
static inline uchar flash_read_uchar (flash_info_t * info, uint offset)
{
      uchar *cp;
      uchar retval;

      cp = flash_map (info, 0, offset);
#if defined(__LITTLE_ENDIAN) || defined(CONFIG_SYS_WRITE_SWAPPED_DATA)
      retval = flash_read8(cp);
#else
      retval = flash_read8(cp + info->portwidth - 1);
#endif
      flash_unmap (info, 0, offset, cp);
      return retval;
}

/*-----------------------------------------------------------------------
 * read a word at a port width address, assume 16bit bus
 */
static inline ushort flash_read_word (flash_info_t * info, uint offset)
{
      ushort *addr, retval;

      addr = flash_map (info, 0, offset);
      retval = flash_read16 (addr);
      flash_unmap (info, 0, offset, addr);
      return retval;
}


/*-----------------------------------------------------------------------
 * read a long word by picking the least significant byte of each maximum
 * port size word. Swap for ppc format.
 */
static ulong flash_read_long (flash_info_t * info, flash_sect_t sect,
                        uint offset)
{
      uchar *addr;
      ulong retval;

#ifdef DEBUG
      int x;
#endif
      addr = flash_map (info, sect, offset);

#ifdef DEBUG
      debug ("long addr is at %p info->portwidth = %d\n", addr,
             info->portwidth);
      for (x = 0; x < 4 * info->portwidth; x++) {
            debug ("addr[%x] = 0x%x\n", x, flash_read8(addr + x));
      }
#endif
#if defined(__LITTLE_ENDIAN) || defined(CONFIG_SYS_WRITE_SWAPPED_DATA)
      retval = ((flash_read8(addr) << 16) |
              (flash_read8(addr + info->portwidth) << 24) |
              (flash_read8(addr + 2 * info->portwidth)) |
              (flash_read8(addr + 3 * info->portwidth) << 8));
#else
      retval = ((flash_read8(addr + 2 * info->portwidth - 1) << 24) |
              (flash_read8(addr + info->portwidth - 1) << 16) |
              (flash_read8(addr + 4 * info->portwidth - 1) << 8) |
              (flash_read8(addr + 3 * info->portwidth - 1)));
#endif
      flash_unmap(info, sect, offset, addr);

      return retval;
}

/*
 * Write a proper sized command to the correct address
 */
void flash_write_cmd (flash_info_t * info, flash_sect_t sect,
                  uint offset, u32 cmd)
{

      void *addr;
      cfiword_t cword;

      addr = flash_map (info, sect, offset);
      flash_make_cmd (info, cmd, &cword);
      switch (info->portwidth) {
      case FLASH_CFI_8BIT:
            debug ("fwc addr %p cmd %x %x 8bit x %d bit\n", addr, cmd,
                   cword.c, info->chipwidth << CFI_FLASH_SHIFT_WIDTH);
            flash_write8(cword.c, addr);
            break;
      case FLASH_CFI_16BIT:
            debug ("fwc addr %p cmd %x %4.4x 16bit x %d bit\n", addr,
                   cmd, cword.w,
                   info->chipwidth << CFI_FLASH_SHIFT_WIDTH);
            flash_write16(cword.w, addr);
            break;
      case FLASH_CFI_32BIT:
            debug ("fwc addr %p cmd %x %8.8lx 32bit x %d bit\n", addr,
                   cmd, cword.l,
                   info->chipwidth << CFI_FLASH_SHIFT_WIDTH);
            flash_write32(cword.l, addr);
            break;
      case FLASH_CFI_64BIT:
#ifdef DEBUG
            {
                  char str[20];

                  print_longlong (str, cword.ll);

                  debug ("fwrite addr %p cmd %x %s 64 bit x %d bit\n",
                         addr, cmd, str,
                         info->chipwidth << CFI_FLASH_SHIFT_WIDTH);
            }
#endif
            flash_write64(cword.ll, addr);
            break;
      }

      /* Ensure all the instructions are fully finished */
      sync();

      flash_unmap(info, sect, offset, addr);
}

static void flash_unlock_seq (flash_info_t * info, flash_sect_t sect)
{
      flash_write_cmd (info, sect, info->addr_unlock1, AMD_CMD_UNLOCK_START);
      flash_write_cmd (info, sect, info->addr_unlock2, AMD_CMD_UNLOCK_ACK);
}

/*-----------------------------------------------------------------------
 */
static int flash_isequal (flash_info_t * info, flash_sect_t sect,
                    uint offset, uchar cmd)
{
      void *addr;
      cfiword_t cword;
      int retval;

      addr = flash_map (info, sect, offset);
      flash_make_cmd (info, cmd, &cword);

      debug ("is= cmd %x(%c) addr %p ", cmd, cmd, addr);
      switch (info->portwidth) {
      case FLASH_CFI_8BIT:
            debug ("is= %x %x\n", flash_read8(addr), cword.c);
            retval = (flash_read8(addr) == cword.c);
            break;
      case FLASH_CFI_16BIT:
            debug ("is= %4.4x %4.4x\n", flash_read16(addr), cword.w);
            retval = (flash_read16(addr) == cword.w);
            break;
      case FLASH_CFI_32BIT:
            debug ("is= %8.8x %8.8lx\n", flash_read32(addr), cword.l);
            retval = (flash_read32(addr) == cword.l);
            break;
      case FLASH_CFI_64BIT:
#ifdef DEBUG
            {
                  char str1[20];
                  char str2[20];

                  print_longlong (str1, flash_read64(addr));
                  print_longlong (str2, cword.ll);
                  debug ("is= %s %s\n", str1, str2);
            }
#endif
            retval = (flash_read64(addr) == cword.ll);
            break;
      default:
            retval = 0;
            break;
      }
      flash_unmap(info, sect, offset, addr);

      return retval;
}

/*-----------------------------------------------------------------------
 */
static int flash_isset (flash_info_t * info, flash_sect_t sect,
                  uint offset, uchar cmd)
{
      void *addr;
      cfiword_t cword;
      int retval;

      addr = flash_map (info, sect, offset);
      flash_make_cmd (info, cmd, &cword);
      switch (info->portwidth) {
      case FLASH_CFI_8BIT:
            retval = ((flash_read8(addr) & cword.c) == cword.c);
            break;
      case FLASH_CFI_16BIT:
            retval = ((flash_read16(addr) & cword.w) == cword.w);
            break;
      case FLASH_CFI_32BIT:
            retval = ((flash_read32(addr) & cword.l) == cword.l);
            break;
      case FLASH_CFI_64BIT:
            retval = ((flash_read64(addr) & cword.ll) == cword.ll);
            break;
      default:
            retval = 0;
            break;
      }
      flash_unmap(info, sect, offset, addr);

      return retval;
}

/*-----------------------------------------------------------------------
 */
static int flash_toggle (flash_info_t * info, flash_sect_t sect,
                   uint offset, uchar cmd)
{
      void *addr;
      cfiword_t cword;
      int retval;

      addr = flash_map (info, sect, offset);
      flash_make_cmd (info, cmd, &cword);
      switch (info->portwidth) {
      case FLASH_CFI_8BIT:
            retval = flash_read8(addr) != flash_read8(addr);
            break;
      case FLASH_CFI_16BIT:
            retval = flash_read16(addr) != flash_read16(addr);
            break;
      case FLASH_CFI_32BIT:
            retval = flash_read32(addr) != flash_read32(addr);
            break;
      case FLASH_CFI_64BIT:
            retval = ( (flash_read32( addr ) != flash_read32( addr )) ||
                     (flash_read32(addr+4) != flash_read32(addr+4)) );
            break;
      default:
            retval = 0;
            break;
      }
      flash_unmap(info, sect, offset, addr);

      return retval;
}

/*
 * flash_is_busy - check to see if the flash is busy
 *
 * This routine checks the status of the chip and returns true if the
 * chip is busy.
 */
static int flash_is_busy (flash_info_t * info, flash_sect_t sect)
{
      int retval;

      switch (info->vendor) {
      case CFI_CMDSET_INTEL_PROG_REGIONS:
      case CFI_CMDSET_INTEL_STANDARD:
      case CFI_CMDSET_INTEL_EXTENDED:
            retval = !flash_isset (info, sect, 0, FLASH_STATUS_DONE);
            break;
      case CFI_CMDSET_AMD_STANDARD:
      case CFI_CMDSET_AMD_EXTENDED:
#ifdef CONFIG_FLASH_CFI_LEGACY
      case CFI_CMDSET_AMD_LEGACY:
#endif
            retval = flash_toggle (info, sect, 0, AMD_STATUS_TOGGLE);
            break;
      default:
            retval = 0;
      }
      debug ("flash_is_busy: %d\n", retval);
      return retval;
}

/*-----------------------------------------------------------------------
 *  wait for XSR.7 to be set. Time out with an error if it does not.
 *  This routine does not set the flash to read-array mode.
 */
static int flash_status_check (flash_info_t * info, flash_sect_t sector,
                         ulong tout, char *prompt)
{
      ulong start;

#if CONFIG_SYS_HZ != 1000
      if ((ulong)CONFIG_SYS_HZ > 100000)
            tout *= (ulong)CONFIG_SYS_HZ / 1000;  /* for a big HZ, avoid overflow */
      else
            tout = DIV_ROUND_UP(tout * (ulong)CONFIG_SYS_HZ, 1000);
#endif

      /* Wait for command completion */
      reset_timer();
      start = get_timer (0);
      while (flash_is_busy (info, sector)) {
            if (get_timer (start) > tout) {
                  printf ("Flash %s timeout at address %lx data %lx\n",
                        prompt, info->start[sector],
                        flash_read_long (info, sector, 0));
                  flash_write_cmd (info, sector, 0, info->cmd_reset);
                  return ERR_TIMOUT;
            }
            udelay (1);       /* also triggers watchdog */
      }
      return ERR_OK;
}

/*-----------------------------------------------------------------------
 * Wait for XSR.7 to be set, if it times out print an error, otherwise
 * do a full status check.
 *
 * This routine sets the flash to read-array mode.
 */
static int flash_full_status_check (flash_info_t * info, flash_sect_t sector,
                            ulong tout, char *prompt)
{
      int retcode;

      retcode = flash_status_check (info, sector, tout, prompt);
      switch (info->vendor) {
      case CFI_CMDSET_INTEL_PROG_REGIONS:
      case CFI_CMDSET_INTEL_EXTENDED:
      case CFI_CMDSET_INTEL_STANDARD:
            if ((retcode != ERR_OK)
                && !flash_isequal (info, sector, 0, FLASH_STATUS_DONE)) {
                  retcode = ERR_INVAL;
                  printf ("Flash %s error at address %lx\n", prompt,
                        info->start[sector]);
                  if (flash_isset (info, sector, 0, FLASH_STATUS_ECLBS |
                               FLASH_STATUS_PSLBS)) {
                        puts ("Command Sequence Error.\n");
                  } else if (flash_isset (info, sector, 0,
                                    FLASH_STATUS_ECLBS)) {
                        puts ("Block Erase Error.\n");
                        retcode = ERR_NOT_ERASED;
                  } else if (flash_isset (info, sector, 0,
                                    FLASH_STATUS_PSLBS)) {
                        puts ("Locking Error\n");
                  }
                  if (flash_isset (info, sector, 0, FLASH_STATUS_DPS)) {
                        puts ("Block locked.\n");
                        retcode = ERR_PROTECTED;
                  }
                  if (flash_isset (info, sector, 0, FLASH_STATUS_VPENS))
                        puts ("Vpp Low Error.\n");
            }
            flash_write_cmd (info, sector, 0, info->cmd_reset);
            break;
      default:
            break;
      }
      return retcode;
}

static int use_flash_status_poll(flash_info_t *info)
{
#ifdef CONFIG_SYS_CFI_FLASH_STATUS_POLL
      if (info->vendor == CFI_CMDSET_AMD_EXTENDED ||
          info->vendor == CFI_CMDSET_AMD_STANDARD)
            return 1;
#endif
      return 0;
}

static int flash_status_poll(flash_info_t *info, void *src, void *dst,
                       ulong tout, char *prompt)
{
#ifdef CONFIG_SYS_CFI_FLASH_STATUS_POLL
      ulong start;
      int ready;

#if CONFIG_SYS_HZ != 1000
      if ((ulong)CONFIG_SYS_HZ > 100000)
            tout *= (ulong)CONFIG_SYS_HZ / 1000;  /* for a big HZ, avoid overflow */
      else
            tout = DIV_ROUND_UP(tout * (ulong)CONFIG_SYS_HZ, 1000);
#endif

      /* Wait for command completion */
      reset_timer();
      start = get_timer(0);
      while (1) {
            switch (info->portwidth) {
            case FLASH_CFI_8BIT:
                  ready = flash_read8(dst) == flash_read8(src);
                  break;
            case FLASH_CFI_16BIT:
                  ready = flash_read16(dst) == flash_read16(src);
                  break;
            case FLASH_CFI_32BIT:
                  ready = flash_read32(dst) == flash_read32(src);
                  break;
            case FLASH_CFI_64BIT:
                  ready = flash_read64(dst) == flash_read64(src);
                  break;
            default:
                  ready = 0;
                  break;
            }
            if (ready)
                  break;
            if (get_timer(start) > tout) {
                  printf("Flash %s timeout at address %lx data %lx\n",
                         prompt, (ulong)dst, (ulong)flash_read8(dst));
                  return ERR_TIMOUT;
            }
            udelay(1);        /* also triggers watchdog */
      }
#endif /* CONFIG_SYS_CFI_FLASH_STATUS_POLL */
      return ERR_OK;
}

/*-----------------------------------------------------------------------
 */
static void flash_add_byte (flash_info_t * info, cfiword_t * cword, uchar c)
{
#if defined(__LITTLE_ENDIAN) && !defined(CONFIG_SYS_WRITE_SWAPPED_DATA)
      unsigned short    w;
      unsigned int      l;
      unsigned long long ll;
#endif

      switch (info->portwidth) {
      case FLASH_CFI_8BIT:
            cword->c = c;
            break;
      case FLASH_CFI_16BIT:
#if defined(__LITTLE_ENDIAN) && !defined(CONFIG_SYS_WRITE_SWAPPED_DATA)
            w = c;
            w <<= 8;
            cword->w = (cword->w >> 8) | w;
#else
            cword->w = (cword->w << 8) | c;
#endif
            break;
      case FLASH_CFI_32BIT:
#if defined(__LITTLE_ENDIAN) && !defined(CONFIG_SYS_WRITE_SWAPPED_DATA)
            l = c;
            l <<= 24;
            cword->l = (cword->l >> 8) | l;
#else
            cword->l = (cword->l << 8) | c;
#endif
            break;
      case FLASH_CFI_64BIT:
#if defined(__LITTLE_ENDIAN) && !defined(CONFIG_SYS_WRITE_SWAPPED_DATA)
            ll = c;
            ll <<= 56;
            cword->ll = (cword->ll >> 8) | ll;
#else
            cword->ll = (cword->ll << 8) | c;
#endif
            break;
      }
}

/*
 * Loop through the sector table starting from the previously found sector.
 * Searches forwards or backwards, dependent on the passed address.
 */
static flash_sect_t find_sector (flash_info_t * info, ulong addr)
{
      static flash_sect_t saved_sector = 0; /* previously found sector */
      flash_sect_t sector = saved_sector;

      while ((info->start[sector] < addr)
                  && (sector < info->sector_count - 1))
            sector++;
      while ((info->start[sector] > addr) && (sector > 0))
            /*
             * also decrements the sector in case of an overshot
             * in the first loop
             */
            sector--;

      saved_sector = sector;
      return sector;
}

/*-----------------------------------------------------------------------
 */
static int flash_write_cfiword (flash_info_t * info, ulong dest,
                        cfiword_t cword)
{
      void *dstaddr = (void *)dest;
      int flag;
      flash_sect_t sect = 0;
      char sect_found = 0;

      /* Check if Flash is (sufficiently) erased */
      switch (info->portwidth) {
      case FLASH_CFI_8BIT:
            flag = ((flash_read8(dstaddr) & cword.c) == cword.c);
            break;
      case FLASH_CFI_16BIT:
            flag = ((flash_read16(dstaddr) & cword.w) == cword.w);
            break;
      case FLASH_CFI_32BIT:
            flag = ((flash_read32(dstaddr) & cword.l) == cword.l);
            break;
      case FLASH_CFI_64BIT:
            flag = ((flash_read64(dstaddr) & cword.ll) == cword.ll);
            break;
      default:
            flag = 0;
            break;
      }
      if (!flag)
            return ERR_NOT_ERASED;

      /* Disable interrupts which might cause a timeout here */
      flag = disable_interrupts ();

      switch (info->vendor) {
      case CFI_CMDSET_INTEL_PROG_REGIONS:
      case CFI_CMDSET_INTEL_EXTENDED:
      case CFI_CMDSET_INTEL_STANDARD:
            flash_write_cmd (info, 0, 0, FLASH_CMD_CLEAR_STATUS);
            flash_write_cmd (info, 0, 0, FLASH_CMD_WRITE);
            break;
      case CFI_CMDSET_AMD_EXTENDED:
      case CFI_CMDSET_AMD_STANDARD:
            sect = find_sector(info, dest);
            flash_unlock_seq (info, sect);
            flash_write_cmd (info, sect, info->addr_unlock1, AMD_CMD_WRITE);
            sect_found = 1;
            break;
#ifdef CONFIG_FLASH_CFI_LEGACY
      case CFI_CMDSET_AMD_LEGACY:
            sect = find_sector(info, dest);
            flash_unlock_seq (info, 0);
            flash_write_cmd (info, 0, info->addr_unlock1, AMD_CMD_WRITE);
            sect_found = 1;
            break;
#endif
      }

      switch (info->portwidth) {
      case FLASH_CFI_8BIT:
            flash_write8(cword.c, dstaddr);
            break;
      case FLASH_CFI_16BIT:
            flash_write16(cword.w, dstaddr);
            break;
      case FLASH_CFI_32BIT:
            flash_write32(cword.l, dstaddr);
            break;
      case FLASH_CFI_64BIT:
            flash_write64(cword.ll, dstaddr);
            break;
      }

      /* re-enable interrupts if necessary */
      if (flag)
            enable_interrupts ();

      if (!sect_found)
            sect = find_sector (info, dest);

      if (use_flash_status_poll(info))
            return flash_status_poll(info, &cword, dstaddr,
                               info->write_tout, "write");
      else
            return flash_full_status_check(info, sect,
                                     info->write_tout, "write");
}

#ifdef CONFIG_SYS_FLASH_USE_BUFFER_WRITE

static int flash_write_cfibuffer (flash_info_t * info, ulong dest, uchar * cp,
                          int len)
{
      flash_sect_t sector;
      int cnt;
      int retcode;
      void *src = cp;
      void *dst = (void *)dest;
      void *dst2 = dst;
      int flag = 0;
      uint offset = 0;
      unsigned int shift;
      uchar write_cmd;

      switch (info->portwidth) {
      case FLASH_CFI_8BIT:
            shift = 0;
            break;
      case FLASH_CFI_16BIT:
            shift = 1;
            break;
      case FLASH_CFI_32BIT:
            shift = 2;
            break;
      case FLASH_CFI_64BIT:
            shift = 3;
            break;
      default:
            retcode = ERR_INVAL;
            goto out_unmap;
      }

      cnt = len >> shift;

      while ((cnt-- > 0) && (flag == 0)) {
            switch (info->portwidth) {
            case FLASH_CFI_8BIT:
                  flag = ((flash_read8(dst2) & flash_read8(src)) ==
                        flash_read8(src));
                  src += 1, dst2 += 1;
                  break;
            case FLASH_CFI_16BIT:
                  flag = ((flash_read16(dst2) & flash_read16(src)) ==
                        flash_read16(src));
                  src += 2, dst2 += 2;
                  break;
            case FLASH_CFI_32BIT:
                  flag = ((flash_read32(dst2) & flash_read32(src)) ==
                        flash_read32(src));
                  src += 4, dst2 += 4;
                  break;
            case FLASH_CFI_64BIT:
                  flag = ((flash_read64(dst2) & flash_read64(src)) ==
                        flash_read64(src));
                  src += 8, dst2 += 8;
                  break;
            }
      }
      if (!flag) {
            retcode = ERR_NOT_ERASED;
            goto out_unmap;
      }

      src = cp;
      sector = find_sector (info, dest);

      switch (info->vendor) {
      case CFI_CMDSET_INTEL_PROG_REGIONS:
      case CFI_CMDSET_INTEL_STANDARD:
      case CFI_CMDSET_INTEL_EXTENDED:
            write_cmd = (info->vendor == CFI_CMDSET_INTEL_PROG_REGIONS) ?
                              FLASH_CMD_WRITE_BUFFER_PROG : FLASH_CMD_WRITE_TO_BUFFER;
            flash_write_cmd (info, sector, 0, FLASH_CMD_CLEAR_STATUS);
            flash_write_cmd (info, sector, 0, FLASH_CMD_READ_STATUS);
            flash_write_cmd (info, sector, 0, write_cmd);
            retcode = flash_status_check (info, sector,
                                    info->buffer_write_tout,
                                    "write to buffer");
            if (retcode == ERR_OK) {
                  /* reduce the number of loops by the width of
                   * the port */
                  cnt = len >> shift;
                  flash_write_cmd (info, sector, 0, cnt - 1);
                  while (cnt-- > 0) {
                        switch (info->portwidth) {
                        case FLASH_CFI_8BIT:
                              flash_write8(flash_read8(src), dst);
                              src += 1, dst += 1;
                              break;
                        case FLASH_CFI_16BIT:
                              flash_write16(flash_read16(src), dst);
                              src += 2, dst += 2;
                              break;
                        case FLASH_CFI_32BIT:
                              flash_write32(flash_read32(src), dst);
                              src += 4, dst += 4;
                              break;
                        case FLASH_CFI_64BIT:
                              flash_write64(flash_read64(src), dst);
                              src += 8, dst += 8;
                              break;
                        default:
                              retcode = ERR_INVAL;
                              goto out_unmap;
                        }
                  }
                  flash_write_cmd (info, sector, 0,
                               FLASH_CMD_WRITE_BUFFER_CONFIRM);
                  retcode = flash_full_status_check (
                        info, sector, info->buffer_write_tout,
                        "buffer write");
            }

            break;

      case CFI_CMDSET_AMD_STANDARD:
      case CFI_CMDSET_AMD_EXTENDED:
            flash_unlock_seq(info,0);

#ifdef CONFIG_FLASH_SPANSION_S29WS_N
            offset = ((unsigned long)dst - info->start[sector]) >> shift;
#endif
            flash_write_cmd(info, sector, offset, AMD_CMD_WRITE_TO_BUFFER);
            cnt = len >> shift;
            flash_write_cmd(info, sector, offset, cnt - 1);

            switch (info->portwidth) {
            case FLASH_CFI_8BIT:
                  while (cnt-- > 0) {
                        flash_write8(flash_read8(src), dst);
                        src += 1, dst += 1;
                  }
                  break;
            case FLASH_CFI_16BIT:
                  while (cnt-- > 0) {
                        flash_write16(flash_read16(src), dst);
                        src += 2, dst += 2;
                  }
                  break;
            case FLASH_CFI_32BIT:
                  while (cnt-- > 0) {
                        flash_write32(flash_read32(src), dst);
                        src += 4, dst += 4;
                  }
                  break;
            case FLASH_CFI_64BIT:
                  while (cnt-- > 0) {
                        flash_write64(flash_read64(src), dst);
                        src += 8, dst += 8;
                  }
                  break;
            default:
                  retcode = ERR_INVAL;
                  goto out_unmap;
            }

            flash_write_cmd (info, sector, 0, AMD_CMD_WRITE_BUFFER_CONFIRM);
            if (use_flash_status_poll(info))
                  retcode = flash_status_poll(info, src - (1 << shift),
                                        dst - (1 << shift),
                                        info->buffer_write_tout,
                                        "buffer write");
            else
                  retcode = flash_full_status_check(info, sector,
                                            info->buffer_write_tout,
                                            "buffer write");
            break;

      default:
            debug ("Unknown Command Set\n");
            retcode = ERR_INVAL;
            break;
      }

out_unmap:
      return retcode;
}
#endif /* CONFIG_SYS_FLASH_USE_BUFFER_WRITE */


/*-----------------------------------------------------------------------
 */
int flash_erase (flash_info_t * info, int s_first, int s_last)
{
      int rcode = 0;
      int prot;
      flash_sect_t sect;
      int st;

      if (info->flash_id != FLASH_MAN_CFI) {
            puts ("Can't erase unknown flash type - aborted\n");
            return 1;
      }
      if ((s_first < 0) || (s_first > s_last)) {
            puts ("- no sectors to erase\n");
            return 1;
      }

      prot = 0;
      for (sect = s_first; sect <= s_last; ++sect) {
            if (info->protect[sect]) {
                  prot++;
            }
      }
      if (prot) {
            printf ("- Warning: %d protected sectors will not be erased!\n",
                  prot);
      } else if (flash_verbose) {
            putc ('\n');
      }


      for (sect = s_first; sect <= s_last; sect++) {
            if (info->protect[sect] == 0) { /* not protected */
                  switch (info->vendor) {
                  case CFI_CMDSET_INTEL_PROG_REGIONS:
                  case CFI_CMDSET_INTEL_STANDARD:
                  case CFI_CMDSET_INTEL_EXTENDED:
                        flash_write_cmd (info, sect, 0,
                                     FLASH_CMD_CLEAR_STATUS);
                        flash_write_cmd (info, sect, 0,
                                     FLASH_CMD_BLOCK_ERASE);
                        flash_write_cmd (info, sect, 0,
                                     FLASH_CMD_ERASE_CONFIRM);
                        break;
                  case CFI_CMDSET_AMD_STANDARD:
                  case CFI_CMDSET_AMD_EXTENDED:
                        flash_unlock_seq (info, sect);
                        flash_write_cmd (info, sect,
                                    info->addr_unlock1,
                                    AMD_CMD_ERASE_START);
                        flash_unlock_seq (info, sect);
                        flash_write_cmd (info, sect, 0,
                                     AMD_CMD_ERASE_SECTOR);
                        break;
#ifdef CONFIG_FLASH_CFI_LEGACY
                  case CFI_CMDSET_AMD_LEGACY:
                        flash_unlock_seq (info, 0);
                        flash_write_cmd (info, 0, info->addr_unlock1,
                                    AMD_CMD_ERASE_START);
                        flash_unlock_seq (info, 0);
                        flash_write_cmd (info, sect, 0,
                                    AMD_CMD_ERASE_SECTOR);
                        break;
#endif
                  default:
                        debug ("Unkown flash vendor %d\n",
                               info->vendor);
                        break;
                  }

                  if (use_flash_status_poll(info)) {
                        cfiword_t cword = (cfiword_t)0xffffffffffffffffULL;
                        void *dest;
                        dest = flash_map(info, sect, 0);
                        st = flash_status_poll(info, &cword, dest,
                                           info->erase_blk_tout, "erase");
                        flash_unmap(info, sect, 0, dest);
                  } else
                        st = flash_full_status_check(info, sect,
                                               info->erase_blk_tout,
                                               "erase");
                  if (st)
                        rcode = 1;
                  else if (flash_verbose)
                        putc ('.');
            }
      }

      if (flash_verbose)
            puts (" done\n");

      return rcode;
}

#ifdef CONFIG_SYS_FLASH_EMPTY_INFO
static int sector_erased(flash_info_t *info, int i)
{
      int k;
      int size;
      volatile unsigned long *flash;

      /*
       * Check if whole sector is erased
       */
      size = flash_sector_size(info, i);
      flash = (volatile unsigned long *) info->start[i];
      /* divide by 4 for longword access */
      size = size >> 2;

      for (k = 0; k < size; k++) {
            if (*flash++ != 0xffffffff)
                  return 0;   /* not erased */
      }

      return 1;               /* erased */
}
#endif /* CONFIG_SYS_FLASH_EMPTY_INFO */

void flash_print_info (flash_info_t * info)
{
      int i;

      if (info->flash_id != FLASH_MAN_CFI) {
            puts ("missing or unknown FLASH type\n");
            return;
      }

      printf ("%s FLASH (%d x %d)",
            info->name,
            (info->portwidth << 3), (info->chipwidth << 3));
      if (info->size < 1024*1024)
            printf ("  Size: %ld kB in %d Sectors\n",
                  info->size >> 10, info->sector_count);
      else
            printf ("  Size: %ld MB in %d Sectors\n",
                  info->size >> 20, info->sector_count);
      printf ("  ");
      switch (info->vendor) {
            case CFI_CMDSET_INTEL_PROG_REGIONS:
                  printf ("Intel Prog Regions");
                  break;
            case CFI_CMDSET_INTEL_STANDARD:
                  printf ("Intel Standard");
                  break;
            case CFI_CMDSET_INTEL_EXTENDED:
                  printf ("Intel Extended");
                  break;
            case CFI_CMDSET_AMD_STANDARD:
                  printf ("AMD Standard");
                  break;
            case CFI_CMDSET_AMD_EXTENDED:
                  printf ("AMD Extended");
                  break;
#ifdef CONFIG_FLASH_CFI_LEGACY
            case CFI_CMDSET_AMD_LEGACY:
                  printf ("AMD Legacy");
                  break;
#endif
            default:
                  printf ("Unknown (%d)", info->vendor);
                  break;
      }
      printf (" command set, Manufacturer ID: 0x%02X, Device ID: 0x",
            info->manufacturer_id);
      printf (info->chipwidth == FLASH_CFI_16BIT ? "%04X" : "%02X",
            info->device_id);
      if (info->device_id == 0x7E) {
            printf("%04X", info->device_id2);
      }
      printf ("\n  Erase timeout: %ld ms, write timeout: %ld ms\n",
            info->erase_blk_tout,
            info->write_tout);
      if (info->buffer_size > 1) {
            printf ("  Buffer write timeout: %ld ms, "
                  "buffer size: %d bytes\n",
            info->buffer_write_tout,
            info->buffer_size);
      }

      puts ("\n  Sector Start Addresses:");
      for (i = 0; i < info->sector_count; ++i) {
            if (ctrlc())
                  break;
            if ((i % 5) == 0)
                  putc('\n');
#ifdef CONFIG_SYS_FLASH_EMPTY_INFO
            /* print empty and read-only info */
            printf ("  %08lX %c %s ",
                  info->start[i],
                  sector_erased(info, i) ? 'E' : ' ',
                  info->protect[i] ? "RO" : "  ");
#else /* ! CONFIG_SYS_FLASH_EMPTY_INFO */
            printf ("  %08lX   %s ",
                  info->start[i],
                  info->protect[i] ? "RO" : "  ");
#endif
      }
      putc ('\n');
      return;
}

/*-----------------------------------------------------------------------
 * This is used in a few places in write_buf() to show programming
 * progress.  Making it a function is nasty because it needs to do side
 * effect updates to digit and dots.  Repeated code is nasty too, so
 * we define it once here.
 */
#ifdef CONFIG_FLASH_SHOW_PROGRESS
#define FLASH_SHOW_PROGRESS(scale, dots, digit, dots_sub) \
      if (flash_verbose) { \
            dots -= dots_sub; \
            if ((scale > 0) && (dots <= 0)) { \
                  if ((digit % 5) == 0) \
                        printf ("%d", digit / 5); \
                  else \
                        putc ('.'); \
                  digit--; \
                  dots += scale; \
            } \
      }
#else
#define FLASH_SHOW_PROGRESS(scale, dots, digit, dots_sub)
#endif

/*-----------------------------------------------------------------------
 * Copy memory to flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 */
int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
{
      ulong wp;
      uchar *p;
      int aln;
      cfiword_t cword;
      int i, rc;
#ifdef CONFIG_SYS_FLASH_USE_BUFFER_WRITE
      int buffered_size;
#endif
#ifdef CONFIG_FLASH_SHOW_PROGRESS
      int digit = CONFIG_FLASH_SHOW_PROGRESS;
      int scale = 0;
      int dots  = 0;

      /*
       * Suppress if there are fewer than CONFIG_FLASH_SHOW_PROGRESS writes.
       */
      if (cnt >= CONFIG_FLASH_SHOW_PROGRESS) {
            scale = (int)((cnt + CONFIG_FLASH_SHOW_PROGRESS - 1) /
                  CONFIG_FLASH_SHOW_PROGRESS);
      }
#endif

      /* get lower aligned address */
      wp = (addr & ~(info->portwidth - 1));

      /* handle unaligned start */
      if ((aln = addr - wp) != 0) {
            cword.l = 0;
            p = (uchar *)wp;
            for (i = 0; i < aln; ++i)
                  flash_add_byte (info, &cword, flash_read8(p + i));

            for (; (i < info->portwidth) && (cnt > 0); i++) {
                  flash_add_byte (info, &cword, *src++);
                  cnt--;
            }
            for (; (cnt == 0) && (i < info->portwidth); ++i)
                  flash_add_byte (info, &cword, flash_read8(p + i));

            rc = flash_write_cfiword (info, wp, cword);
            if (rc != 0)
                  return rc;

            wp += i;
            FLASH_SHOW_PROGRESS(scale, dots, digit, i);
      }

      /* handle the aligned part */
#ifdef CONFIG_SYS_FLASH_USE_BUFFER_WRITE
      buffered_size = (info->portwidth / info->chipwidth);
      buffered_size *= info->buffer_size;
      while (cnt >= info->portwidth) {
            /* prohibit buffer write when buffer_size is 1 */
            if (info->buffer_size == 1) {
                  cword.l = 0;
                  for (i = 0; i < info->portwidth; i++)
                        flash_add_byte (info, &cword, *src++);
                  if ((rc = flash_write_cfiword (info, wp, cword)) != 0)
                        return rc;
                  wp += info->portwidth;
                  cnt -= info->portwidth;
                  continue;
            }

            /* write buffer until next buffered_size aligned boundary */
            i = buffered_size - (wp % buffered_size);
            if (i > cnt)
                  i = cnt;
            if ((rc = flash_write_cfibuffer (info, wp, src, i)) != ERR_OK)
                  return rc;
            i -= i & (info->portwidth - 1);
            wp += i;
            src += i;
            cnt -= i;
            FLASH_SHOW_PROGRESS(scale, dots, digit, i);
      }
#else
      while (cnt >= info->portwidth) {
            cword.l = 0;
            for (i = 0; i < info->portwidth; i++) {
                  flash_add_byte (info, &cword, *src++);
            }
            if ((rc = flash_write_cfiword (info, wp, cword)) != 0)
                  return rc;
            wp += info->portwidth;
            cnt -= info->portwidth;
            FLASH_SHOW_PROGRESS(scale, dots, digit, info->portwidth);
      }
#endif /* CONFIG_SYS_FLASH_USE_BUFFER_WRITE */

      if (cnt == 0) {
            return (0);
      }

      /*
       * handle unaligned tail bytes
       */
      cword.l = 0;
      p = (uchar *)wp;
      for (i = 0; (i < info->portwidth) && (cnt > 0); ++i) {
            flash_add_byte (info, &cword, *src++);
            --cnt;
      }
      for (; i < info->portwidth; ++i)
            flash_add_byte (info, &cword, flash_read8(p + i));

      return flash_write_cfiword (info, wp, cword);
}

/*-----------------------------------------------------------------------
 */
#ifdef CONFIG_SYS_FLASH_PROTECTION

int flash_real_protect (flash_info_t * info, long sector, int prot)
{
      int retcode = 0;

      switch (info->vendor) {
            case CFI_CMDSET_INTEL_PROG_REGIONS:
            case CFI_CMDSET_INTEL_STANDARD:
            case CFI_CMDSET_INTEL_EXTENDED:
                  /*
                   * see errata called
                   * "Numonyx Axcell P33/P30 Specification Update" :)
                   */
                  flash_write_cmd (info, sector, 0, FLASH_CMD_READ_ID);
                  if (!flash_isequal (info, sector, FLASH_OFFSET_PROTECT,
                                  prot)) {
                        /*
                         * cmd must come before FLASH_CMD_PROTECT + 20us
                         * Disable interrupts which might cause a timeout here.
                         */
                        int flag = disable_interrupts ();
                        unsigned short cmd;

                        if (prot)
                              cmd = FLASH_CMD_PROTECT_SET;
                        else
                              cmd = FLASH_CMD_PROTECT_CLEAR;

                        flash_write_cmd (info, sector, 0,
                                      FLASH_CMD_PROTECT);
                        flash_write_cmd (info, sector, 0, cmd);
                        /* re-enable interrupts if necessary */
                        if (flag)
                              enable_interrupts ();
                  }
                  break;
            case CFI_CMDSET_AMD_EXTENDED:
            case CFI_CMDSET_AMD_STANDARD:
                  /* U-Boot only checks the first byte */
                  if (info->manufacturer_id == (uchar)ATM_MANUFACT) {
                        if (prot) {
                              flash_unlock_seq (info, 0);
                              flash_write_cmd (info, 0,
                                          info->addr_unlock1,
                                          ATM_CMD_SOFTLOCK_START);
                              flash_unlock_seq (info, 0);
                              flash_write_cmd (info, sector, 0,
                                          ATM_CMD_LOCK_SECT);
                        } else {
                              flash_write_cmd (info, 0,
                                          info->addr_unlock1,
                                          AMD_CMD_UNLOCK_START);
                              if (info->device_id == ATM_ID_BV6416)
                                    flash_write_cmd (info, sector,
                                          0, ATM_CMD_UNLOCK_SECT);
                        }
                  }
                  break;
#ifdef CONFIG_FLASH_CFI_LEGACY
            case CFI_CMDSET_AMD_LEGACY:
                  flash_write_cmd (info, sector, 0, FLASH_CMD_CLEAR_STATUS);
                  flash_write_cmd (info, sector, 0, FLASH_CMD_PROTECT);
                  if (prot)
                        flash_write_cmd (info, sector, 0, FLASH_CMD_PROTECT_SET);
                  else
                        flash_write_cmd (info, sector, 0, FLASH_CMD_PROTECT_CLEAR);
#endif
      };

      if ((retcode =
           flash_full_status_check (info, sector, info->erase_blk_tout,
                              prot ? "protect" : "unprotect")) == 0) {

            info->protect[sector] = prot;

            /*
             * On some of Intel's flash chips (marked via legacy_unlock)
             * unprotect unprotects all locking.
             */
            if ((prot == 0) && (info->legacy_unlock)) {
                  flash_sect_t i;

                  for (i = 0; i < info->sector_count; i++) {
                        if (info->protect[i])
                              flash_real_protect (info, i, 1);
                  }
            }
      }
      return retcode;
}

/*-----------------------------------------------------------------------
 * flash_read_user_serial - read the OneTimeProgramming cells
 */
void flash_read_user_serial (flash_info_t * info, void *buffer, int offset,
                       int len)
{
      uchar *src;
      uchar *dst;

      dst = buffer;
      src = flash_map (info, 0, FLASH_OFFSET_USER_PROTECTION);
      flash_write_cmd (info, 0, 0, FLASH_CMD_READ_ID);
      memcpy (dst, src + offset, len);
      flash_write_cmd (info, 0, 0, info->cmd_reset);
      flash_unmap(info, 0, FLASH_OFFSET_USER_PROTECTION, src);
}

/*
 * flash_read_factory_serial - read the device Id from the protection area
 */
void flash_read_factory_serial (flash_info_t * info, void *buffer, int offset,
                        int len)
{
      uchar *src;

      src = flash_map (info, 0, FLASH_OFFSET_INTEL_PROTECTION);
      flash_write_cmd (info, 0, 0, FLASH_CMD_READ_ID);
      memcpy (buffer, src + offset, len);
      flash_write_cmd (info, 0, 0, info->cmd_reset);
      flash_unmap(info, 0, FLASH_OFFSET_INTEL_PROTECTION, src);
}

#endif /* CONFIG_SYS_FLASH_PROTECTION */

/*-----------------------------------------------------------------------
 * Reverse the order of the erase regions in the CFI QRY structure.
 * This is needed for chips that are either a) correctly detected as
 * top-boot, or b) buggy.
 */
static void cfi_reverse_geometry(struct cfi_qry *qry)
{
      unsigned int i, j;
      u32 tmp;

      for (i = 0, j = qry->num_erase_regions - 1; i < j; i++, j--) {
            tmp = qry->erase_region_info[i];
            qry->erase_region_info[i] = qry->erase_region_info[j];
            qry->erase_region_info[j] = tmp;
      }
}

/*-----------------------------------------------------------------------
 * read jedec ids from device and set corresponding fields in info struct
 *
 * Note: assume cfi->vendor, cfi->portwidth and cfi->chipwidth are correct
 *
 */
static void cmdset_intel_read_jedec_ids(flash_info_t *info)
{
      flash_write_cmd(info, 0, 0, FLASH_CMD_RESET);
      flash_write_cmd(info, 0, 0, FLASH_CMD_READ_ID);
      udelay(1000); /* some flash are slow to respond */
      info->manufacturer_id = flash_read_uchar (info,
                              FLASH_OFFSET_MANUFACTURER_ID);
      info->device_id = (info->chipwidth == FLASH_CFI_16BIT) ?
                  flash_read_word (info, FLASH_OFFSET_DEVICE_ID) :
                  flash_read_uchar (info, FLASH_OFFSET_DEVICE_ID);
      flash_write_cmd(info, 0, 0, FLASH_CMD_RESET);
}

static int cmdset_intel_init(flash_info_t *info, struct cfi_qry *qry)
{
      info->cmd_reset = FLASH_CMD_RESET;

      cmdset_intel_read_jedec_ids(info);
      flash_write_cmd(info, 0, info->cfi_offset, FLASH_CMD_CFI);

#ifdef CONFIG_SYS_FLASH_PROTECTION
      /* read legacy lock/unlock bit from intel flash */
      if (info->ext_addr) {
            info->legacy_unlock = flash_read_uchar (info,
                        info->ext_addr + 5) & 0x08;
      }
#endif

      return 0;
}

static void cmdset_amd_read_jedec_ids(flash_info_t *info)
{
      ushort bankId = 0;
      uchar  manuId;

      flash_write_cmd(info, 0, 0, AMD_CMD_RESET);
      flash_unlock_seq(info, 0);
      flash_write_cmd(info, 0, info->addr_unlock1, FLASH_CMD_READ_ID);
      udelay(1000); /* some flash are slow to respond */

      manuId = flash_read_uchar (info, FLASH_OFFSET_MANUFACTURER_ID);
      /* JEDEC JEP106Z specifies ID codes up to bank 7 */
      while (manuId == FLASH_CONTINUATION_CODE && bankId < 0x800) {
            bankId += 0x100;
            manuId = flash_read_uchar (info,
                  bankId | FLASH_OFFSET_MANUFACTURER_ID);
      }
      info->manufacturer_id = manuId;

      switch (info->chipwidth){
      case FLASH_CFI_8BIT:
            info->device_id = flash_read_uchar (info,
                                    FLASH_OFFSET_DEVICE_ID);
            if (info->device_id == 0x7E) {
                  /* AMD 3-byte (expanded) device ids */
                  info->device_id2 = flash_read_uchar (info,
                                    FLASH_OFFSET_DEVICE_ID2);
                  info->device_id2 <<= 8;
                  info->device_id2 |= flash_read_uchar (info,
                                    FLASH_OFFSET_DEVICE_ID3);
            }
            break;
      case FLASH_CFI_16BIT:
            info->device_id = flash_read_word (info,
                                    FLASH_OFFSET_DEVICE_ID);
            break;
      default:
            break;
      }
      flash_write_cmd(info, 0, 0, AMD_CMD_RESET);
}

static int cmdset_amd_init(flash_info_t *info, struct cfi_qry *qry)
{
      info->cmd_reset = AMD_CMD_RESET;

      cmdset_amd_read_jedec_ids(info);
      flash_write_cmd(info, 0, info->cfi_offset, FLASH_CMD_CFI);

      return 0;
}

#ifdef CONFIG_FLASH_CFI_LEGACY
static void flash_read_jedec_ids (flash_info_t * info)
{
      info->manufacturer_id = 0;
      info->device_id       = 0;
      info->device_id2      = 0;

      switch (info->vendor) {
      case CFI_CMDSET_INTEL_PROG_REGIONS:
      case CFI_CMDSET_INTEL_STANDARD:
      case CFI_CMDSET_INTEL_EXTENDED:
            cmdset_intel_read_jedec_ids(info);
            break;
      case CFI_CMDSET_AMD_STANDARD:
      case CFI_CMDSET_AMD_EXTENDED:
            cmdset_amd_read_jedec_ids(info);
            break;
      default:
            break;
      }
}

/*-----------------------------------------------------------------------
 * Call board code to request info about non-CFI flash.
 * board_flash_get_legacy needs to fill in at least:
 * info->portwidth, info->chipwidth and info->interface for Jedec probing.
 */
static int flash_detect_legacy(phys_addr_t base, int banknum)
{
      flash_info_t *info = &flash_info[banknum];

      if (board_flash_get_legacy(base, banknum, info)) {
            /* board code may have filled info completely. If not, we
               use JEDEC ID probing. */
            if (!info->vendor) {
                  int modes[] = {
                        CFI_CMDSET_AMD_STANDARD,
                        CFI_CMDSET_INTEL_STANDARD
                  };
                  int i;

                  for (i = 0; i < sizeof(modes) / sizeof(modes[0]); i++) {
                        info->vendor = modes[i];
                        info->start[0] =
                              (ulong)map_physmem(base,
                                             info->portwidth,
                                             MAP_NOCACHE);
                        if (info->portwidth == FLASH_CFI_8BIT
                              && info->interface == FLASH_CFI_X8X16) {
                              info->addr_unlock1 = 0x2AAA;
                              info->addr_unlock2 = 0x5555;
                        } else {
                              info->addr_unlock1 = 0x5555;
                              info->addr_unlock2 = 0x2AAA;
                        }
                        flash_read_jedec_ids(info);
                        debug("JEDEC PROBE: ID %x %x %x\n",
                                    info->manufacturer_id,
                                    info->device_id,
                                    info->device_id2);
                        if (jedec_flash_match(info, info->start[0]))
                              break;
                        else
                              unmap_physmem((void *)info->start[0],
                                          MAP_NOCACHE);
                  }
            }

            switch(info->vendor) {
            case CFI_CMDSET_INTEL_PROG_REGIONS:
            case CFI_CMDSET_INTEL_STANDARD:
            case CFI_CMDSET_INTEL_EXTENDED:
                  info->cmd_reset = FLASH_CMD_RESET;
                  break;
            case CFI_CMDSET_AMD_STANDARD:
            case CFI_CMDSET_AMD_EXTENDED:
            case CFI_CMDSET_AMD_LEGACY:
                  info->cmd_reset = AMD_CMD_RESET;
                  break;
            }
            info->flash_id = FLASH_MAN_CFI;
            return 1;
      }
      return 0; /* use CFI */
}
#else
static inline int flash_detect_legacy(phys_addr_t base, int banknum)
{
      return 0; /* use CFI */
}
#endif

/*-----------------------------------------------------------------------
 * detect if flash is compatible with the Common Flash Interface (CFI)
 * http://www.jedec.org/download/search/jesd68.pdf
 */
static void flash_read_cfi (flash_info_t *info, void *buf,
            unsigned int start, size_t len)
{
      u8 *p = buf;
      unsigned int i;

      for (i = 0; i < len; i++)
            p[i] = flash_read_uchar(info, start + i);
}

void __flash_cmd_reset(flash_info_t *info)
{
      /*
       * We do not yet know what kind of commandset to use, so we issue
       * the reset command in both Intel and AMD variants, in the hope
       * that AMD flash roms ignore the Intel command.
       */
      flash_write_cmd(info, 0, 0, AMD_CMD_RESET);
      flash_write_cmd(info, 0, 0, FLASH_CMD_RESET);
}
void flash_cmd_reset(flash_info_t *info)
      __attribute__((weak,alias("__flash_cmd_reset")));

static int __flash_detect_cfi (flash_info_t * info, struct cfi_qry *qry)
{
      int cfi_offset;

      /* Issue FLASH reset command */
      flash_cmd_reset(info);

      for (cfi_offset=0;
           cfi_offset < sizeof(flash_offset_cfi) / sizeof(uint);
           cfi_offset++) {
            flash_write_cmd (info, 0, flash_offset_cfi[cfi_offset],
                         FLASH_CMD_CFI);
            if (flash_isequal (info, 0, FLASH_OFFSET_CFI_RESP, 'Q')
                && flash_isequal (info, 0, FLASH_OFFSET_CFI_RESP + 1, 'R')
                && flash_isequal (info, 0, FLASH_OFFSET_CFI_RESP + 2, 'Y')) {
                  flash_read_cfi(info, qry, FLASH_OFFSET_CFI_RESP,
                              sizeof(struct cfi_qry));
                  info->interface   = le16_to_cpu(qry->interface_desc);

                  info->cfi_offset = flash_offset_cfi[cfi_offset];
                  debug ("device interface is %d\n",
                         info->interface);
                  debug ("found port %d chip %d ",
                         info->portwidth, info->chipwidth);
                  debug ("port %d bits chip %d bits\n",
                         info->portwidth << CFI_FLASH_SHIFT_WIDTH,
                         info->chipwidth << CFI_FLASH_SHIFT_WIDTH);

                  /* calculate command offsets as in the Linux driver */
                  info->addr_unlock1 = 0x555;
                  info->addr_unlock2 = 0x2aa;

                  /*
                   * modify the unlock address if we are
                   * in compatibility mode
                   */
                  if (  /* x8/x16 in x8 mode */
                        ((info->chipwidth == FLASH_CFI_BY8) &&
                              (info->interface == FLASH_CFI_X8X16)) ||
                        /* x16/x32 in x16 mode */
                        ((info->chipwidth == FLASH_CFI_BY16) &&
                              (info->interface == FLASH_CFI_X16X32)))
                  {
                        info->addr_unlock1 = 0xaaa;
                        info->addr_unlock2 = 0x555;
                  }

                  info->name = "CFI conformant";
                  return 1;
            }
      }

      return 0;
}

static int flash_detect_cfi (flash_info_t * info, struct cfi_qry *qry)
{
      debug ("flash detect cfi\n");

      for (info->portwidth = CONFIG_SYS_FLASH_CFI_WIDTH;
           info->portwidth <= FLASH_CFI_64BIT; info->portwidth <<= 1) {
            for (info->chipwidth = FLASH_CFI_BY8;
                 info->chipwidth <= info->portwidth;
                 info->chipwidth <<= 1)
                  if (__flash_detect_cfi(info, qry))
                        return 1;
      }
      debug ("not found\n");
      return 0;
}

/*
 * Manufacturer-specific quirks. Add workarounds for geometry
 * reversal, etc. here.
 */
static void flash_fixup_amd(flash_info_t *info, struct cfi_qry *qry)
{
      /* check if flash geometry needs reversal */
      if (qry->num_erase_regions > 1) {
            /* reverse geometry if top boot part */
            if (info->cfi_version < 0x3131) {
                  /* CFI < 1.1, try to guess from device id */
                  if ((info->device_id & 0x80) != 0)
                        cfi_reverse_geometry(qry);
            } else if (flash_read_uchar(info, info->ext_addr + 0xf) == 3) {
                  /* CFI >= 1.1, deduct from top/bottom flag */
                  /* note: ext_addr is valid since cfi_version > 0 */
                  cfi_reverse_geometry(qry);
            }
      }
}

static void flash_fixup_atmel(flash_info_t *info, struct cfi_qry *qry)
{
      int reverse_geometry = 0;

      /* Check the "top boot" bit in the PRI */
      if (info->ext_addr && !(flash_read_uchar(info, info->ext_addr + 6) & 1))
            reverse_geometry = 1;

      /* AT49BV6416(T) list the erase regions in the wrong order.
       * However, the device ID is identical with the non-broken
       * AT49BV642D they differ in the high byte.
       */
      if (info->device_id == 0xd6 || info->device_id == 0xd2)
            reverse_geometry = !reverse_geometry;

      if (reverse_geometry)
            cfi_reverse_geometry(qry);
}

static void flash_fixup_stm(flash_info_t *info, struct cfi_qry *qry)
{
      /* check if flash geometry needs reversal */
      if (qry->num_erase_regions > 1) {
            /* reverse geometry if top boot part */
            if (info->cfi_version < 0x3131) {
                  /* CFI < 1.1, guess by device id (M29W320{DT,ET} only) */
                  if (info->device_id == 0x22CA ||
                      info->device_id == 0x2256) {
                        cfi_reverse_geometry(qry);
                  }
            }
      }
}

/*
 * The following code cannot be run from FLASH!
 *
 */
ulong flash_get_size (phys_addr_t base, int banknum)
{
      flash_info_t *info = &flash_info[banknum];
      int i, j;
      flash_sect_t sect_cnt;
      phys_addr_t sector;
      unsigned long tmp;
      int size_ratio;
      uchar num_erase_regions;
      int erase_region_size;
      int erase_region_count;
      struct cfi_qry qry;

      memset(&qry, 0, sizeof(qry));

      info->ext_addr = 0;
      info->cfi_version = 0;
#ifdef CONFIG_SYS_FLASH_PROTECTION
      info->legacy_unlock = 0;
#endif

      info->start[0] = (ulong)map_physmem(base, info->portwidth, MAP_NOCACHE);

      if (flash_detect_cfi (info, &qry)) {
            info->vendor = le16_to_cpu(qry.p_id);
            info->ext_addr = le16_to_cpu(qry.p_adr);
            num_erase_regions = qry.num_erase_regions;

            if (info->ext_addr) {
                  info->cfi_version = (ushort) flash_read_uchar (info,
                                    info->ext_addr + 3) << 8;
                  info->cfi_version |= (ushort) flash_read_uchar (info,
                                    info->ext_addr + 4);
            }

#ifdef DEBUG
            flash_printqry (&qry);
#endif

            switch (info->vendor) {
            case CFI_CMDSET_INTEL_PROG_REGIONS:
            case CFI_CMDSET_INTEL_STANDARD:
            case CFI_CMDSET_INTEL_EXTENDED:
                  cmdset_intel_init(info, &qry);
                  break;
            case CFI_CMDSET_AMD_STANDARD:
            case CFI_CMDSET_AMD_EXTENDED:
                  cmdset_amd_init(info, &qry);
                  break;
            default:
                  printf("CFI: Unknown command set 0x%x\n",
                              info->vendor);
                  /*
                   * Unfortunately, this means we don't know how
                   * to get the chip back to Read mode. Might
                   * as well try an Intel-style reset...
                   */
                  flash_write_cmd(info, 0, 0, FLASH_CMD_RESET);
                  return 0;
            }

            /* Do manufacturer-specific fixups */
            switch (info->manufacturer_id) {
            case 0x0001:
                  flash_fixup_amd(info, &qry);
                  break;
            case 0x001f:
                  flash_fixup_atmel(info, &qry);
                  break;
            case 0x0020:
                  flash_fixup_stm(info, &qry);
                  break;
            }

            debug ("manufacturer is %d\n", info->vendor);
            debug ("manufacturer id is 0x%x\n", info->manufacturer_id);
            debug ("device id is 0x%x\n", info->device_id);
            debug ("device id2 is 0x%x\n", info->device_id2);
            debug ("cfi version is 0x%04x\n", info->cfi_version);

            size_ratio = info->portwidth / info->chipwidth;
            /* if the chip is x8/x16 reduce the ratio by half */
            if ((info->interface == FLASH_CFI_X8X16)
                && (info->chipwidth == FLASH_CFI_BY8)) {
                  size_ratio >>= 1;
            }
            debug ("size_ratio %d port %d bits chip %d bits\n",
                   size_ratio, info->portwidth << CFI_FLASH_SHIFT_WIDTH,
                   info->chipwidth << CFI_FLASH_SHIFT_WIDTH);
            debug ("found %d erase regions\n", num_erase_regions);
            sect_cnt = 0;
            sector = base;
            for (i = 0; i < num_erase_regions; i++) {
                  if (i > NUM_ERASE_REGIONS) {
                        printf ("%d erase regions found, only %d used\n",
                              num_erase_regions, NUM_ERASE_REGIONS);
                        break;
                  }

                  tmp = le32_to_cpu(qry.erase_region_info[i]);
                  debug("erase region %u: 0x%08lx\n", i, tmp);

                  erase_region_count = (tmp & 0xffff) + 1;
                  tmp >>= 16;
                  erase_region_size =
                        (tmp & 0xffff) ? ((tmp & 0xffff) * 256) : 128;
                  debug ("erase_region_count = %d erase_region_size = %d\n",
                        erase_region_count, erase_region_size);
                  for (j = 0; j < erase_region_count; j++) {
                        if (sect_cnt >= CONFIG_SYS_MAX_FLASH_SECT) {
                              printf("ERROR: too many flash sectors\n");
                              break;
                        }
                        info->start[sect_cnt] =
                              (ulong)map_physmem(sector,
                                             info->portwidth,
                                             MAP_NOCACHE);
                        sector += (erase_region_size * size_ratio);

                        /*
                         * Only read protection status from
                         * supported devices (intel...)
                         */
                        switch (info->vendor) {
                        case CFI_CMDSET_INTEL_PROG_REGIONS:
                        case CFI_CMDSET_INTEL_EXTENDED:
                        case CFI_CMDSET_INTEL_STANDARD:
                              info->protect[sect_cnt] =
                                    flash_isset (info, sect_cnt,
                                               FLASH_OFFSET_PROTECT,
                                               FLASH_STATUS_PROTECT);
                              break;
                        default:
                              /* default: not protected */
                              info->protect[sect_cnt] = 0;
                        }

                        sect_cnt++;
                  }
            }

            info->sector_count = sect_cnt;
            info->size = 1 << qry.dev_size;
            /* multiply the size by the number of chips */
            info->size *= size_ratio;
            info->buffer_size = 1 << le16_to_cpu(qry.max_buf_write_size);
            tmp = 1 << qry.block_erase_timeout_typ;
            info->erase_blk_tout = tmp *
                  (1 << qry.block_erase_timeout_max);
            tmp = (1 << qry.buf_write_timeout_typ) *
                  (1 << qry.buf_write_timeout_max);

            /* round up when converting to ms */
            info->buffer_write_tout = (tmp + 999) / 1000;
            tmp = (1 << qry.word_write_timeout_typ) *
                  (1 << qry.word_write_timeout_max);
            /* round up when converting to ms */
            info->write_tout = (tmp + 999) / 1000;
            info->flash_id = FLASH_MAN_CFI;
            if ((info->interface == FLASH_CFI_X8X16) &&
                (info->chipwidth == FLASH_CFI_BY8)) {
                  /* XXX - Need to test on x8/x16 in parallel. */
                  info->portwidth >>= 1;
            }

            flash_write_cmd (info, 0, 0, info->cmd_reset);
      }

      return (info->size);
}

void flash_set_verbose(uint v)
{
      flash_verbose = v;
}

/*-----------------------------------------------------------------------
 */
unsigned long flash_init (void)
{
      unsigned long size = 0;
      int i;
#if defined(CONFIG_SYS_FLASH_AUTOPROTECT_LIST)
      struct apl_s {
            ulong start;
            ulong size;
      } apl[] = CONFIG_SYS_FLASH_AUTOPROTECT_LIST;
#endif

#ifdef CONFIG_SYS_FLASH_PROTECTION
      /* read environment from EEPROM */
      char s[64];
      getenv_f("unlock", s, sizeof(s));
#endif

#define BANK_BASE(i)    (((phys_addr_t [CFI_MAX_FLASH_BANKS])CONFIG_SYS_FLASH_BANKS_LIST)[i])

      /* Init: no FLASHes known */
      for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
            flash_info[i].flash_id = FLASH_UNKNOWN;

            if (!flash_detect_legacy (BANK_BASE(i), i))
                  flash_get_size (BANK_BASE(i), i);
            size += flash_info[i].size;
            if (flash_info[i].flash_id == FLASH_UNKNOWN) {
#ifndef CONFIG_SYS_FLASH_QUIET_TEST
                  printf ("## Unknown FLASH on Bank %d "
                        "- Size = 0x%08lx = %ld MB\n",
                        i+1, flash_info[i].size,
                        flash_info[i].size << 20);
#endif /* CONFIG_SYS_FLASH_QUIET_TEST */
            }
#ifdef CONFIG_SYS_FLASH_PROTECTION
            else if ((s != NULL) && (strcmp(s, "yes") == 0)) {
                  /*
                   * Only the U-Boot image and it's environment
                   * is protected, all other sectors are
                   * unprotected (unlocked) if flash hardware
                   * protection is used (CONFIG_SYS_FLASH_PROTECTION)
                   * and the environment variable "unlock" is
                   * set to "yes".
                   */
                  if (flash_info[i].legacy_unlock) {
                        int k;

                        /*
                         * Disable legacy_unlock temporarily,
                         * since flash_real_protect would
                         * relock all other sectors again
                         * otherwise.
                         */
                        flash_info[i].legacy_unlock = 0;

                        /*
                         * Legacy unlocking (e.g. Intel J3) ->
                         * unlock only one sector. This will
                         * unlock all sectors.
                         */
                        flash_real_protect (&flash_info[i], 0, 0);

                        flash_info[i].legacy_unlock = 1;

                        /*
                         * Manually mark other sectors as
                         * unlocked (unprotected)
                         */
                        for (k = 1; k < flash_info[i].sector_count; k++)
                              flash_info[i].protect[k] = 0;
                  } else {
                        /*
                         * No legancy unlocking -> unlock all sectors
                         */
                        flash_protect (FLAG_PROTECT_CLEAR,
                                     flash_info[i].start[0],
                                     flash_info[i].start[0]
                                     + flash_info[i].size - 1,
                                     &flash_info[i]);
                  }
            }
#endif /* CONFIG_SYS_FLASH_PROTECTION */
      }

      /* Monitor protection ON by default */
#if (CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE) && \
      (!defined(CONFIG_MONITOR_IS_IN_RAM))
      flash_protect (FLAG_PROTECT_SET,
                   CONFIG_SYS_MONITOR_BASE,
                   CONFIG_SYS_MONITOR_BASE + monitor_flash_len  - 1,
                   flash_get_info(CONFIG_SYS_MONITOR_BASE));
#endif

      /* Environment protection ON by default */
#ifdef CONFIG_ENV_IS_IN_FLASH
      flash_protect (FLAG_PROTECT_SET,
                   CONFIG_ENV_ADDR,
                   CONFIG_ENV_ADDR + CONFIG_ENV_SECT_SIZE - 1,
                   flash_get_info(CONFIG_ENV_ADDR));
#endif

      /* Redundant environment protection ON by default */
#ifdef CONFIG_ENV_ADDR_REDUND
      flash_protect (FLAG_PROTECT_SET,
                   CONFIG_ENV_ADDR_REDUND,
                   CONFIG_ENV_ADDR_REDUND + CONFIG_ENV_SECT_SIZE - 1,
                   flash_get_info(CONFIG_ENV_ADDR_REDUND));
#endif

#if defined(CONFIG_SYS_FLASH_AUTOPROTECT_LIST)
      for (i = 0; i < (sizeof(apl) / sizeof(struct apl_s)); i++) {
            debug("autoprotecting from %08x to %08x\n",
                  apl[i].start, apl[i].start + apl[i].size - 1);
            flash_protect (FLAG_PROTECT_SET,
                         apl[i].start,
                         apl[i].start + apl[i].size - 1,
                         flash_get_info(apl[i].start));
      }
#endif

#ifdef CONFIG_FLASH_CFI_MTD
      cfi_mtd_init();
#endif

      return (size);
}

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