/*
 * (C) Copyright 2000
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * 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 <mpc824x.h>
#include <asm/processor.h>
#include <asm/pci_io.h>

#define ROM_CS0_START   0xFF800000
#define ROM_CS1_START   0xFF000000

flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];    /* info for FLASH chips    */

#if defined(CONFIG_ENV_IS_IN_FLASH)
# ifndef  CONFIG_ENV_ADDR
#  define CONFIG_ENV_ADDR  (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
# endif
# ifndef  CONFIG_ENV_SIZE
#  define CONFIG_ENV_SIZE  CONFIG_ENV_SECT_SIZE
# endif
# ifndef  CONFIG_ENV_SECT_SIZE
#  define CONFIG_ENV_SECT_SIZE  CONFIG_ENV_SIZE
# endif
#endif

/*-----------------------------------------------------------------------
 * Functions
 */
static int write_word (flash_info_t * info, ulong dest, ulong data);

#if 0
static void flash_get_offsets (ulong base, flash_info_t * info);
#endif /* 0 */

/*flash command address offsets*/

#if 0
#define ADDR0           (0x555)
#define ADDR1           (0x2AA)
#define ADDR3           (0x001)
#else
#define ADDR0           (0xAAA)
#define ADDR1           (0x555)
#define ADDR3           (0x001)
#endif

#define FLASH_WORD_SIZE unsigned char

/*-----------------------------------------------------------------------
 */

#if 0
static int byte_parity_odd (unsigned char x) __attribute__ ((const));
#endif /* 0 */
static unsigned long flash_id (unsigned char mfct, unsigned char chip)
        __attribute__ ((const));

typedef struct {
        FLASH_WORD_SIZE extval;
        unsigned short intval;
} map_entry;

#if 0
static int byte_parity_odd (unsigned char x)
{
        x ^= x >> 4;
        x ^= x >> 2;
        x ^= x >> 1;
        return (x & 0x1) != 0;
}
#endif /* 0 */


static unsigned long flash_id (unsigned char mfct, unsigned char chip)
{
        static const map_entry mfct_map[] = {
                {(FLASH_WORD_SIZE) AMD_MANUFACT,
                 (unsigned short) ((unsigned long) FLASH_MAN_AMD >> 16)},
                {(FLASH_WORD_SIZE) FUJ_MANUFACT,
                 (unsigned short) ((unsigned long) FLASH_MAN_FUJ >> 16)},
                {(FLASH_WORD_SIZE) STM_MANUFACT,
                 (unsigned short) ((unsigned long) FLASH_MAN_STM >> 16)},
                {(FLASH_WORD_SIZE) MT_MANUFACT,
                 (unsigned short) ((unsigned long) FLASH_MAN_MT >> 16)},
                {(FLASH_WORD_SIZE) INTEL_MANUFACT,
                 (unsigned short) ((unsigned long) FLASH_MAN_INTEL >> 16)},
                {(FLASH_WORD_SIZE) INTEL_ALT_MANU,
                 (unsigned short) ((unsigned long) FLASH_MAN_INTEL >> 16)}
        };

        static const map_entry chip_map[] = {
                {AMD_ID_F040B, FLASH_AM040},
                {(FLASH_WORD_SIZE) STM_ID_x800AB, FLASH_STM800AB}
        };

        const map_entry *p;
        unsigned long result = FLASH_UNKNOWN;

        /* find chip id */
        for (p = &chip_map[0];
             p < &chip_map[sizeof chip_map / sizeof chip_map[0]]; p++)
                if (p->extval == chip) {
                        result = FLASH_VENDMASK | p->intval;
                        break;
                }

        /* find vendor id */
        for (p = &mfct_map[0];
             p < &mfct_map[sizeof mfct_map / sizeof mfct_map[0]]; p++)
                if (p->extval == mfct) {
                        result &= ~FLASH_VENDMASK;
                        result |= (unsigned long) p->intval << 16;
                        break;
                }

        return result;
}


unsigned long flash_init (void)
{
        unsigned long i;
        unsigned char j;
        static const ulong flash_banks[] = CONFIG_SYS_FLASH_BANKS;

        /* Init: no FLASHes known */
        for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
                flash_info_t *const pflinfo = &flash_info[i];

                pflinfo->flash_id = FLASH_UNKNOWN;
                pflinfo->size = 0;
                pflinfo->sector_count = 0;
        }

        for (i = 0; i < sizeof flash_banks / sizeof flash_banks[0]; i++) {
                flash_info_t *const pflinfo = &flash_info[i];
                const unsigned long base_address = flash_banks[i];
                volatile FLASH_WORD_SIZE *const flash =
                        (FLASH_WORD_SIZE *) base_address;
#if 0
                volatile FLASH_WORD_SIZE *addr2;
#endif
#if 0
                /* write autoselect sequence */
                flash[0x5555] = 0xaa;
                flash[0x2aaa] = 0x55;
                flash[0x5555] = 0x90;
#else
                flash[0xAAA << (3 * i)] = 0xaa;
                flash[0x555 << (3 * i)] = 0x55;
                flash[0xAAA << (3 * i)] = 0x90;
#endif
                __asm__ __volatile__ ("sync");

#if 0
                pflinfo->flash_id = flash_id (flash[0x0], flash[0x1]);
#else
                pflinfo->flash_id =
                        flash_id (flash[0x0], flash[0x2 + 14 * i]);
#endif

                switch (pflinfo->flash_id & FLASH_TYPEMASK) {
                case FLASH_AM040:
                        pflinfo->size = 0x00080000;
                        pflinfo->sector_count = 8;
                        for (j = 0; j < 8; j++) {
                                pflinfo->start[j] =
                                        base_address + 0x00010000 * j;
                                pflinfo->protect[j] = flash[(j << 16) | 0x2];
                        }
                        break;
                case FLASH_STM800AB:
                        pflinfo->size = 0x00100000;
                        pflinfo->sector_count = 19;
                        pflinfo->start[0] = base_address;
                        pflinfo->start[1] = base_address + 0x4000;
                        pflinfo->start[2] = base_address + 0x6000;
                        pflinfo->start[3] = base_address + 0x8000;
                        for (j = 1; j < 16; j++) {
                                pflinfo->start[j + 3] =
                                        base_address + 0x00010000 * j;
                        }
#if 0
                        /* check for protected sectors */
                        for (j = 0; j < pflinfo->sector_count; j++) {
                                /* read sector protection at sector address, (A7 .. A0) = 0x02 */
                                /* D0 = 1 if protected */
                                addr2 = (volatile FLASH_WORD_SIZE
                                         *) (pflinfo->start[j]);
                                if (pflinfo->flash_id & FLASH_MAN_SST)
                                        pflinfo->protect[j] = 0;
                                else
                                        pflinfo->protect[j] = addr2[2] & 1;
                        }
#endif
                        break;
                }
                /* Protect monitor and environment sectors
                 */
#if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
                flash_protect (FLAG_PROTECT_SET,
                               CONFIG_SYS_MONITOR_BASE,
                               CONFIG_SYS_MONITOR_BASE + monitor_flash_len - 1,
                               &flash_info[0]);
#endif

#if defined(CONFIG_ENV_IS_IN_FLASH) && defined(CONFIG_ENV_ADDR)
                flash_protect (FLAG_PROTECT_SET,
                               CONFIG_ENV_ADDR,
                               CONFIG_ENV_ADDR + CONFIG_ENV_SIZE - 1,
                               &flash_info[0]);
#endif

                /* reset device to read mode */
                flash[0x0000] = 0xf0;
                __asm__ __volatile__ ("sync");
        }

        return flash_info[0].size + flash_info[1].size;
}

#if 0
static void flash_get_offsets (ulong base, flash_info_t * info)
{
        int i;

        /* set up sector start address table */
        if (info->flash_id & FLASH_MAN_SST) {
                for (i = 0; i < info->sector_count; i++)
                        info->start[i] = base + (i * 0x00010000);
        } else if (info->flash_id & FLASH_BTYPE) {
                /* set sector offsets for bottom boot block type    */
                info->start[0] = base + 0x00000000;
                info->start[1] = base + 0x00004000;
                info->start[2] = base + 0x00006000;
                info->start[3] = base + 0x00008000;
                for (i = 4; i < info->sector_count; i++) {
                        info->start[i] = base + (i * 0x00010000) - 0x00030000;
                }
        } else {
                /* set sector offsets for top boot block type       */
                i = info->sector_count - 1;
                info->start[i--] = base + info->size - 0x00004000;
                info->start[i--] = base + info->size - 0x00006000;
                info->start[i--] = base + info->size - 0x00008000;
                for (; i >= 0; i--) {
                        info->start[i] = base + i * 0x00010000;
                }
        }

}
#endif /* 0 */

/*-----------------------------------------------------------------------
 */
void flash_print_info (flash_info_t * info)
{
        static const char unk[] = "Unknown";
        const char *mfct = unk, *type = unk;
        unsigned int i;

        if (info->flash_id != FLASH_UNKNOWN) {
                switch (info->flash_id & FLASH_VENDMASK) {
                case FLASH_MAN_AMD:
                        mfct = "AMD";
                        break;
                case FLASH_MAN_FUJ:
                        mfct = "FUJITSU";
                        break;
                case FLASH_MAN_STM:
                        mfct = "STM";
                        break;
                case FLASH_MAN_SST:
                        mfct = "SST";
                        break;
                case FLASH_MAN_BM:
                        mfct = "Bright Microelectonics";
                        break;
                case FLASH_MAN_INTEL:
                        mfct = "Intel";
                        break;
                }

                switch (info->flash_id & FLASH_TYPEMASK) {
                case FLASH_AM040:
                        type = "AM29F040B (512K * 8, uniform sector size)";
                        break;
                case FLASH_AM400B:
                        type = "AM29LV400B (4 Mbit, bottom boot sect)";
                        break;
                case FLASH_AM400T:
                        type = "AM29LV400T (4 Mbit, top boot sector)";
                        break;
                case FLASH_AM800B:
                        type = "AM29LV800B (8 Mbit, bottom boot sect)";
                        break;
                case FLASH_AM800T:
                        type = "AM29LV800T (8 Mbit, top boot sector)";
                        break;
                case FLASH_AM160T:
                        type = "AM29LV160T (16 Mbit, top boot sector)";
                        break;
                case FLASH_AM320B:
                        type = "AM29LV320B (32 Mbit, bottom boot sect)";
                        break;
                case FLASH_AM320T:
                        type = "AM29LV320T (32 Mbit, top boot sector)";
                        break;
                case FLASH_STM800AB:
                        type = "M29W800AB (8 Mbit, bottom boot sect)";
                        break;
                case FLASH_SST800A:
                        type = "SST39LF/VF800 (8 Mbit, uniform sector size)";
                        break;
                case FLASH_SST160A:
                        type = "SST39LF/VF160 (16 Mbit, uniform sector size)";
                        break;
                }
        }

        printf ("\n  Brand: %s Type: %s\n"
                "  Size: %lu KB in %d Sectors\n",
                mfct, type, info->size >> 10, info->sector_count);

        printf ("  Sector Start Addresses:");

        for (i = 0; i < info->sector_count; i++) {
                unsigned long size;
                unsigned int erased;
                unsigned long *flash = (unsigned long *) info->start[i];

                /*
                 * Check if whole sector is erased
                 */
                size = (i != (info->sector_count - 1)) ?
                        (info->start[i + 1] - info->start[i]) >> 2 :
                        (info->start[0] + info->size - info->start[i]) >> 2;

                for (flash = (unsigned long *) info->start[i], erased = 1;
                     (flash != (unsigned long *) info->start[i] + size)
                     && erased; flash++)
                        erased = *flash == ~0x0UL;

                printf ("%s %08lX %s %s",
                        (i % 5) ? "" : "\n   ",
                        info->start[i],
                        erased ? "E" : " ", info->protect[i] ? "RO" : "  ");
        }

        puts ("\n");
        return;
}

#if 0

/*
 * The following code cannot be run from FLASH!
 */
ulong flash_get_size (vu_long * addr, flash_info_t * info)
{
        short i;
        FLASH_WORD_SIZE value;
        ulong base = (ulong) addr;
        volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *) addr;

        printf ("flash_get_size: \n");
        /* Write auto select command: read Manufacturer ID */
        eieio ();
        addr2[ADDR0] = (FLASH_WORD_SIZE) 0xAA;
        addr2[ADDR1] = (FLASH_WORD_SIZE) 0x55;
        addr2[ADDR0] = (FLASH_WORD_SIZE) 0x90;
        value = addr2[0];

        switch (value) {
        case (FLASH_WORD_SIZE) AMD_MANUFACT:
                info->flash_id = FLASH_MAN_AMD;
                break;
        case (FLASH_WORD_SIZE) FUJ_MANUFACT:
                info->flash_id = FLASH_MAN_FUJ;
                break;
        case (FLASH_WORD_SIZE) SST_MANUFACT:
                info->flash_id = FLASH_MAN_SST;
                break;
        default:
                info->flash_id = FLASH_UNKNOWN;
                info->sector_count = 0;
                info->size = 0;
                return (0);     /* no or unknown flash  */
        }
        printf ("recognised manufacturer");

        value = addr2[ADDR3];   /* device ID        */
        debug ("\ndev_code=%x\n", value);

        switch (value) {
        case (FLASH_WORD_SIZE) AMD_ID_LV400T:
                info->flash_id += FLASH_AM400T;
                info->sector_count = 11;
                info->size = 0x00080000;
                break;          /* => 0.5 MB        */

        case (FLASH_WORD_SIZE) AMD_ID_LV400B:
                info->flash_id += FLASH_AM400B;
                info->sector_count = 11;
                info->size = 0x00080000;
                break;          /* => 0.5 MB        */

        case (FLASH_WORD_SIZE) AMD_ID_LV800T:
                info->flash_id += FLASH_AM800T;
                info->sector_count = 19;
                info->size = 0x00100000;
                break;          /* => 1 MB      */

        case (FLASH_WORD_SIZE) AMD_ID_LV800B:
                info->flash_id += FLASH_AM800B;
                info->sector_count = 19;
                info->size = 0x00100000;
                break;          /* => 1 MB      */

        case (FLASH_WORD_SIZE) AMD_ID_LV160T:
                info->flash_id += FLASH_AM160T;
                info->sector_count = 35;
                info->size = 0x00200000;
                break;          /* => 2 MB      */

        case (FLASH_WORD_SIZE) AMD_ID_LV160B:
                info->flash_id += FLASH_AM160B;
                info->sector_count = 35;
                info->size = 0x00200000;
                break;          /* => 2 MB      */

        case (FLASH_WORD_SIZE) SST_ID_xF800A:
                info->flash_id += FLASH_SST800A;
                info->sector_count = 16;
                info->size = 0x00100000;
                break;          /* => 1 MB      */

        case (FLASH_WORD_SIZE) SST_ID_xF160A:
                info->flash_id += FLASH_SST160A;
                info->sector_count = 32;
                info->size = 0x00200000;
                break;          /* => 2 MB      */

        case (FLASH_WORD_SIZE) AMD_ID_F040B:
                info->flash_id += FLASH_AM040;
                info->sector_count = 8;
                info->size = 0x00080000;
                break;          /* => 0.5 MB      */

        default:
                info->flash_id = FLASH_UNKNOWN;
                return (0);     /* => no or unknown flash */

        }

        printf ("flash id %lx; sector count %x, size %lx\n", info->flash_id,
                info->sector_count, info->size);
        /* set up sector start address table */
        if (info->flash_id & FLASH_MAN_SST) {
                for (i = 0; i < info->sector_count; i++)
                        info->start[i] = base + (i * 0x00010000);
        } else if (info->flash_id & FLASH_BTYPE) {
                /* set sector offsets for bottom boot block type    */
                info->start[0] = base + 0x00000000;
                info->start[1] = base + 0x00004000;
                info->start[2] = base + 0x00006000;
                info->start[3] = base + 0x00008000;
                for (i = 4; i < info->sector_count; i++) {
                        info->start[i] = base + (i * 0x00010000) - 0x00030000;
                }
        } else {
                /* set sector offsets for top boot block type       */
                i = info->sector_count - 1;
                info->start[i--] = base + info->size - 0x00004000;
                info->start[i--] = base + info->size - 0x00006000;
                info->start[i--] = base + info->size - 0x00008000;
                for (; i >= 0; i--) {
                        info->start[i] = base + i * 0x00010000;
                }
        }

        /* check for protected sectors */
        for (i = 0; i < info->sector_count; i++) {
                /* read sector protection at sector address, (A7 .. A0) = 0x02 */
                /* D0 = 1 if protected */
                addr2 = (volatile FLASH_WORD_SIZE *) (info->start[i]);
                if (info->flash_id & FLASH_MAN_SST)
                        info->protect[i] = 0;
                else
                        info->protect[i] = addr2[2] & 1;
        }

        /*
         * Prevent writes to uninitialized FLASH.
         */
        if (info->flash_id != FLASH_UNKNOWN) {
                addr2 = (FLASH_WORD_SIZE *) info->start[0];
                *addr2 = (FLASH_WORD_SIZE) 0x00F000F0;  /* reset bank */
        }

        return (info->size);
}

#endif


int flash_erase (flash_info_t * info, int s_first, int s_last)
{
        volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *) (info->start[0]);
        int flag, prot, sect, l_sect;
        ulong start, now, last;
        unsigned char sh8b;

        if ((s_first < 0) || (s_first > s_last)) {
                if (info->flash_id == FLASH_UNKNOWN) {
                        printf ("- missing\n");
                } else {
                        printf ("- no sectors to erase\n");
                }
                return 1;
        }

        if ((info->flash_id == FLASH_UNKNOWN) ||
            (info->flash_id > (FLASH_MAN_STM | FLASH_AMD_COMP))) {
                printf ("Can't erase unknown flash type - aborted\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 {
                printf ("\n");
        }

        l_sect = -1;

        /* Check the ROM CS */
        if ((info->start[0] >= ROM_CS1_START)
            && (info->start[0] < ROM_CS0_START))
                sh8b = 3;
        else
                sh8b = 0;

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

        addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE) 0x00AA00AA;
        addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE) 0x00550055;
        addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE) 0x00800080;
        addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE) 0x00AA00AA;
        addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE) 0x00550055;

        /* Start erase on unprotected sectors */
        for (sect = s_first; sect <= s_last; sect++) {
                if (info->protect[sect] == 0) { /* not protected */
                        addr = (FLASH_WORD_SIZE *) (info->start[0] + ((info->
                                                                       start
                                                                       [sect]
                                                                       -
                                                                       info->
                                                                       start
                                                                       [0]) <<
                                                                      sh8b));
                        if (info->flash_id & FLASH_MAN_SST) {
                                addr[ADDR0 << sh8b] =
                                        (FLASH_WORD_SIZE) 0x00AA00AA;
                                addr[ADDR1 << sh8b] =
                                        (FLASH_WORD_SIZE) 0x00550055;
                                addr[ADDR0 << sh8b] =
                                        (FLASH_WORD_SIZE) 0x00800080;
                                addr[ADDR0 << sh8b] =
                                        (FLASH_WORD_SIZE) 0x00AA00AA;
                                addr[ADDR1 << sh8b] =
                                        (FLASH_WORD_SIZE) 0x00550055;
                                addr[0] = (FLASH_WORD_SIZE) 0x00500050; /* block erase */
                                udelay (30000); /* wait 30 ms */
                        } else
                                addr[0] = (FLASH_WORD_SIZE) 0x00300030; /* sector erase */
                        l_sect = sect;
                }
        }

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

        /* wait at least 80us - let's wait 1 ms */
        udelay (1000);

        /*
         * We wait for the last triggered sector
         */
        if (l_sect < 0)
                goto DONE;

        start = get_timer (0);
        last = start;
        addr = (FLASH_WORD_SIZE *) (info->start[0] + ((info->start[l_sect] -
                                                       info->
                                                       start[0]) << sh8b));
        while ((addr[0] & (FLASH_WORD_SIZE) 0x00800080) !=
               (FLASH_WORD_SIZE) 0x00800080) {
                if ((now = get_timer (start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
                        printf ("Timeout\n");
                        return 1;
                }
                /* show that we're waiting */
                if ((now - last) > 1000) {      /* every second */
                        serial_putc ('.');
                        last = now;
                }
        }

      DONE:
        /* reset to read mode */
        addr = (FLASH_WORD_SIZE *) info->start[0];
        addr[0] = (FLASH_WORD_SIZE) 0x00F000F0; /* reset bank */

        printf (" done\n");
        return 0;
}

/*-----------------------------------------------------------------------
 * 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 cp, wp, data;
        int i, l, rc;

        wp = (addr & ~3);       /* get lower word aligned address */

        /*
         * handle unaligned start bytes
         */
        if ((l = addr - wp) != 0) {
                data = 0;
                for (i = 0, cp = wp; i < l; ++i, ++cp) {
                        data = (data << 8) | (*(uchar *) cp);
                }
                for (; i < 4 && cnt > 0; ++i) {
                        data = (data << 8) | *src++;
                        --cnt;
                        ++cp;
                }
                for (; cnt == 0 && i < 4; ++i, ++cp) {
                        data = (data << 8) | (*(uchar *) cp);
                }

                if ((rc = write_word (info, wp, data)) != 0) {
                        return (rc);
                }
                wp += 4;
        }

        /*
         * handle word aligned part
         */
        while (cnt >= 4) {
                data = 0;
                for (i = 0; i < 4; ++i) {
                        data = (data << 8) | *src++;
                }
                if ((rc = write_word (info, wp, data)) != 0) {
                        return (rc);
                }
                wp += 4;
                cnt -= 4;
        }

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

        /*
         * handle unaligned tail bytes
         */
        data = 0;
        for (i = 0, cp = wp; i < 4 && cnt > 0; ++i, ++cp) {
                data = (data << 8) | *src++;
                --cnt;
        }
        for (; i < 4; ++i, ++cp) {
                data = (data << 8) | (*(uchar *) cp);
        }

        return (write_word (info, wp, data));
}

/*-----------------------------------------------------------------------
 * Write a word to Flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 */
static int write_word (flash_info_t * info, ulong dest, ulong data)
{
        volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *) info->start[0];
        volatile FLASH_WORD_SIZE *dest2;
        volatile FLASH_WORD_SIZE *data2 = (FLASH_WORD_SIZE *) & data;
        ulong start;
        int flag;
        int i;
        unsigned char sh8b;

        /* Check the ROM CS */
        if ((info->start[0] >= ROM_CS1_START)
            && (info->start[0] < ROM_CS0_START))
                sh8b = 3;
        else
                sh8b = 0;

        dest2 = (FLASH_WORD_SIZE *) (((dest - info->start[0]) << sh8b) +
                                     info->start[0]);

        /* Check if Flash is (sufficiently) erased */
        if ((*dest2 & (FLASH_WORD_SIZE) data) != (FLASH_WORD_SIZE) data) {
                return (2);
        }
        /* Disable interrupts which might cause a timeout here */
        flag = disable_interrupts ();

        for (i = 0; i < 4 / sizeof (FLASH_WORD_SIZE); i++) {
                addr2[ADDR0 << sh8b] = (FLASH_WORD_SIZE) 0x00AA00AA;
                addr2[ADDR1 << sh8b] = (FLASH_WORD_SIZE) 0x00550055;
                addr2[ADDR0 << sh8b] = (FLASH_WORD_SIZE) 0x00A000A0;

                dest2[i << sh8b] = data2[i];

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

                /* data polling for D7 */
                start = get_timer (0);
                while ((dest2[i << sh8b] & (FLASH_WORD_SIZE) 0x00800080) !=
                       (data2[i] & (FLASH_WORD_SIZE) 0x00800080)) {
                        if (get_timer (start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
                                return (1);
                        }
                }
        }

        return (0);
}

/*-----------------------------------------------------------------------
 */