/*
 * (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
 */

/*
 * Modified 4/5/2001
 * Wait for completion of each sector erase command issued
 * 4/5/2001
 * Chris Hallinan - DS4.COM, Inc. - clh@net1plus.com
 */

#include <common.h>
#include <ppc4xx.h>
#include <asm/processor.h>

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

#undef DEBUG
#ifdef DEBUG
#define DEBUGF(x...) printf(x)
#else
#define DEBUGF(x...)
#endif                          /* DEBUG */

#define CONFIG_SYS_FLASH_CHAR_SIZE unsigned char
#define CONFIG_SYS_FLASH_CHAR_ADDR0 (0x0aaa)
#define CONFIG_SYS_FLASH_CHAR_ADDR1 (0x0555)
/*-----------------------------------------------------------------------
 * Functions
 */
static ulong flash_get_size(vu_long * addr, flash_info_t * info);
static void flash_get_offsets(ulong base, flash_info_t * info);
static int write_word(flash_info_t * info, ulong dest, ulong data);
#ifdef FLASH_BASE1_PRELIM
static int write_word_1(flash_info_t * info, ulong dest, ulong data);
static int write_word_2(flash_info_t * info, ulong dest, ulong data);
static int flash_erase_1(flash_info_t * info, int s_first, int s_last);
static int flash_erase_2(flash_info_t * info, int s_first, int s_last);
static ulong flash_get_size_1(vu_long * addr, flash_info_t * info);
static ulong flash_get_size_2(vu_long * addr, flash_info_t * info);
#endif

unsigned long flash_init(void)
{
        unsigned long size_b0, size_b1=0;
        int i;

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

        /* Static FLASH Bank configuration here - FIXME XXX */

        size_b0 =
            flash_get_size((vu_long *) FLASH_BASE0_PRELIM, &flash_info[0]);

        if (flash_info[0].flash_id == FLASH_UNKNOWN) {
                printf("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
                       size_b0, size_b0 << 20);
        }

        if (size_b0) {
                /* Setup offsets */
                flash_get_offsets(FLASH_BASE0_PRELIM, &flash_info[0]);
                /* Monitor protection ON by default */
                (void)flash_protect(FLAG_PROTECT_SET,
                                    CONFIG_SYS_MONITOR_BASE,
                                    CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN - 1,
                                    &flash_info[0]);
#ifdef CONFIG_ENV_IS_IN_FLASH
                (void)flash_protect(FLAG_PROTECT_SET, CONFIG_ENV_ADDR,
                                    CONFIG_ENV_ADDR + CONFIG_ENV_SECT_SIZE - 1,
                                    &flash_info[0]);
                (void)flash_protect(FLAG_PROTECT_SET, CONFIG_ENV_ADDR_REDUND,
                                    CONFIG_ENV_ADDR_REDUND + CONFIG_ENV_SECT_SIZE - 1,
                                    &flash_info[0]);
#endif
                /* Also protect sector containing initial power-up instruction */
                /* (flash_protect() checks address range - other call ignored) */
                (void)flash_protect(FLAG_PROTECT_SET,
                                    0xFFFFFFFC, 0xFFFFFFFF, &flash_info[0]);

                flash_info[0].size = size_b0;
        }
#ifdef FLASH_BASE1_PRELIM
        size_b1 =
            flash_get_size((vu_long *) FLASH_BASE1_PRELIM, &flash_info[1])*2;

        if (flash_info[1].flash_id == FLASH_UNKNOWN) {
                printf("## Unknown FLASH on Bank 1 - Size = 0x%08lx = %ld MB\n",
                       size_b1, size_b1 << 20);
        }

        if (size_b1) {
                /* Setup offsets */
                flash_get_offsets(FLASH_BASE1_PRELIM, &flash_info[1]);
                flash_info[1].size = size_b1;
        }
#endif
        return (size_b0 + size_b1);
}

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

        /* set up sector start address table */
        if (((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) ||
            (info->flash_id == FLASH_AM040)) {
                for (i = 0; i < info->sector_count; i++)
                        info->start[i] = base + (i * 0x00010000);
        } else if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMLV128U) {
                for (i = 0; i < info->sector_count; i++) {
                        info->start[i] = base + (i * 0x00010000*2);
                }
        } else if ((info->flash_id & FLASH_TYPEMASK) == FLASH_S29GL128N ) {
                for (i = 0; i < info->sector_count; i++) {
                        info->start[i] = base + (i * 0x00020000*2);
                }
        } 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;
                        }
                }
        }
}


void flash_print_info(flash_info_t * info)
{
        int i;
        int k;
        int size;
        int erased;
        volatile unsigned long *flash;

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

        switch (info->flash_id & FLASH_VENDMASK) {
        case FLASH_MAN_AMD:
                printf("AMD ");
                break;
        case FLASH_MAN_STM:
                printf("STM ");
                break;
        case FLASH_MAN_FUJ:
                printf("FUJITSU ");
                break;
        case FLASH_MAN_SST:
                printf("SST ");
                break;
        default:
                printf("Unknown Vendor ");
                break;
        }

        switch (info->flash_id & FLASH_TYPEMASK) {
        case FLASH_AM040:
                printf("AM29F040 (512 Kbit, uniform sector size)\n");
                break;
        case FLASH_AM400B:
                printf("AM29LV400B (4 Mbit, bottom boot sect)\n");
                break;
        case FLASH_AM400T:
                printf("AM29LV400T (4 Mbit, top boot sector)\n");
                break;
        case FLASH_AM800B:
                printf("AM29LV800B (8 Mbit, bottom boot sect)\n");
                break;
        case FLASH_AM800T:
                printf("AM29LV800T (8 Mbit, top boot sector)\n");
                break;
        case FLASH_AMD016:
                printf("AM29F016D (16 Mbit, uniform sector size)\n");
                break;
        case FLASH_AM160B:
                printf("AM29LV160B (16 Mbit, bottom boot sect)\n");
                break;
        case FLASH_AM160T:
                printf("AM29LV160T (16 Mbit, top boot sector)\n");
                break;
        case FLASH_AM320B:
                printf("AM29LV320B (32 Mbit, bottom boot sect)\n");
                break;
        case FLASH_AM320T:
                printf("AM29LV320T (32 Mbit, top boot sector)\n");
                break;
        case FLASH_AM033C:
                printf("AM29LV033C (32 Mbit, top boot sector)\n");
                break;
        case FLASH_AMLV128U:
                printf("AM29LV128U (128 Mbit * 2, top boot sector)\n");
                break;
        case FLASH_SST800A:
                printf("SST39LF/VF800 (8 Mbit, uniform sector size)\n");
                break;
        case FLASH_SST160A:
                printf("SST39LF/VF160 (16 Mbit, uniform sector size)\n");
                break;
        case FLASH_STMW320DT:
                printf ("M29W320DT (32 M, top sector)\n");
                break;
        case FLASH_S29GL128N:
                printf ("S29GL128N (256 Mbit, uniform sector size)\n");
                break;
        default:
                printf("Unknown Chip Type\n");
                break;
        }

        printf("  Size: %ld KB in %d Sectors\n",
               info->size >> 10, info->sector_count);

        printf("  Sector Start Addresses:");
        for (i = 0; i < info->sector_count; ++i) {
                /*
                 * Check if whole sector is erased
                 */
                if (i != (info->sector_count - 1))
                        size = info->start[i + 1] - info->start[i];
                else
                        size = info->start[0] + info->size - info->start[i];
                erased = 1;
                flash = (volatile unsigned long *)info->start[i];
                size = size >> 2;       /* divide by 4 for longword access */
                for (k = 0; k < size; k++) {
                        if (*flash++ != 0xffffffff) {
                                erased = 0;
                                break;
                        }
                }

                if ((i % 5) == 0)
                        printf("\n   ");
                printf(" %08lX%s%s",
                       info->start[i],
                       erased ? " E" : "  ", info->protect[i] ? "RO " : "   ");
        }
        printf("\n");
        return;
}


/*
 * The following code cannot be run from FLASH!
 */
#ifdef FLASH_BASE1_PRELIM
static ulong flash_get_size(vu_long * addr, flash_info_t * info)
{
        if ((ulong)addr == FLASH_BASE1_PRELIM) {
                return flash_get_size_2(addr, info);
        } else {
                return flash_get_size_1(addr, info);
        }
}

static ulong flash_get_size_1(vu_long * addr, flash_info_t * info)
#else
static ulong flash_get_size(vu_long * addr, flash_info_t * info)
#endif
{
        short i;
        CONFIG_SYS_FLASH_WORD_SIZE value;
        ulong base = (ulong) addr;
        volatile CONFIG_SYS_FLASH_WORD_SIZE *addr2 = (CONFIG_SYS_FLASH_WORD_SIZE *) addr;

        DEBUGF("FLASH ADDR: %08x\n", (unsigned)addr);

        /* Write auto select command: read Manufacturer ID */
        addr2[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00AA00AA;
        addr2[CONFIG_SYS_FLASH_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00550055;
        addr2[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00900090;
        udelay(1000);

        value = addr2[0];
        DEBUGF("FLASH MANUFACT: %x\n", value);

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

        value = addr2[1];       /* device ID            */
        DEBUGF("\nFLASH DEVICEID: %x\n", value);

        switch (value) {
        case (CONFIG_SYS_FLASH_WORD_SIZE) AMD_ID_LV040B:
                info->flash_id += FLASH_AM040;
                info->sector_count = 8;
                info->size = 0x0080000; /* => 512 ko */
                break;

        case (CONFIG_SYS_FLASH_WORD_SIZE) AMD_ID_F040B:
                info->flash_id += FLASH_AM040;
                info->sector_count = 8;
                info->size = 0x0080000; /* => 512 ko */
                break;

        case (CONFIG_SYS_FLASH_WORD_SIZE) STM_ID_M29W040B:
                info->flash_id += FLASH_AM040;
                info->sector_count = 8;
                info->size = 0x0080000; /* => 512 ko */
                break;

        case (CONFIG_SYS_FLASH_WORD_SIZE) AMD_ID_F016D:
                info->flash_id += FLASH_AMD016;
                info->sector_count = 32;
                info->size = 0x00200000;
                break;          /* => 2 MB              */

        case (CONFIG_SYS_FLASH_WORD_SIZE) AMD_ID_LV033C:
                info->flash_id += FLASH_AMDLV033C;
                info->sector_count = 64;
                info->size = 0x00400000;
                break;          /* => 4 MB              */

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

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

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

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

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

        case (CONFIG_SYS_FLASH_WORD_SIZE) AMD_ID_LV160B:
                info->flash_id += FLASH_AM160B;
                info->sector_count = 35;
                info->size = 0x00200000;
                break;          /* => 2 MB              */
        default:
                info->flash_id = FLASH_UNKNOWN;
                return 0;       /* => no or unknown flash */
        }

        /* set up sector start address table */
        if (((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) ||
            ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040) ||
            ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMD016)) {
                for (i = 0; i < info->sector_count; i++)
                        info->start[i] = base + (i * 0x00010000);
        }
        else if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMLV128U) {
                for (i = 0; i < info->sector_count; i++)
                        info->start[i] = base + (i * 0x00010000 * 2);
        } 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 CONFIG_SYS_FLASH_WORD_SIZE *)(info->start[i]);

                /* For AMD29033C flash we need to resend the command of *
                 * reading flash protection for upper 8 Mb of flash     */
                if (i == 32) {
                        addr2[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0xAAAAAAAA;
                        addr2[CONFIG_SYS_FLASH_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x55555555;
                        addr2[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x90909090;
                }

                if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST)
                        info->protect[i] = 0;
                else
                        info->protect[i] = addr2[2] & 1;
        }

        /* issue bank reset to return to read mode */
        addr2[0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00F000F0;

        return info->size;
}

static int wait_for_DQ7_1(flash_info_t * info, int sect)
{
        ulong start, now, last;
        volatile CONFIG_SYS_FLASH_WORD_SIZE *addr =
            (CONFIG_SYS_FLASH_WORD_SIZE *) (info->start[sect]);

        start = get_timer(0);
        last = start;
        while ((addr[0] & (CONFIG_SYS_FLASH_WORD_SIZE) 0x00800080) !=
               (CONFIG_SYS_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 */
                        putc('.');
                        last = now;
                }
        }
        return 0;
}

#ifdef FLASH_BASE1_PRELIM
int flash_erase(flash_info_t * info, int s_first, int s_last)
{
        if (((info->flash_id & FLASH_TYPEMASK) == FLASH_AM320B) ||
            ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM320T) ||
            ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMLV128U) ||
            ((info->flash_id & FLASH_TYPEMASK) == FLASH_S29GL128N) ||
            ((info->flash_id & FLASH_TYPEMASK) == FLASH_STMW320DT)) {
                return flash_erase_2(info, s_first, s_last);
        } else {
                return flash_erase_1(info, s_first, s_last);
        }
}

static int flash_erase_1(flash_info_t * info, int s_first, int s_last)
#else
int flash_erase(flash_info_t * info, int s_first, int s_last)
#endif
{
        volatile CONFIG_SYS_FLASH_WORD_SIZE *addr = (CONFIG_SYS_FLASH_WORD_SIZE *) (info->start[0]);
        volatile CONFIG_SYS_FLASH_WORD_SIZE *addr2;
        int flag, prot, sect, l_sect;
        int i;

        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) {
                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;

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

        /* Start erase on unprotected sectors */
        for (sect = s_first; sect <= s_last; sect++) {
                if (info->protect[sect] == 0) { /* not protected */
                        addr2 = (CONFIG_SYS_FLASH_WORD_SIZE *) (info->start[sect]);

                        if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) {
                                addr[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00AA00AA;
                                addr[CONFIG_SYS_FLASH_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00550055;
                                addr[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00800080;
                                addr[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00AA00AA;
                                addr[CONFIG_SYS_FLASH_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00550055;
                                addr2[0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00500050;     /* block erase */
                                for (i = 0; i < 50; i++)
                                        udelay(1000);   /* wait 1 ms */
                        } else {
                                addr[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00AA00AA;
                                addr[CONFIG_SYS_FLASH_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00550055;
                                addr[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00800080;
                                addr[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00AA00AA;
                                addr[CONFIG_SYS_FLASH_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00550055;
                                addr2[0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00300030;     /* sector erase */
                        }
                        l_sect = sect;
                        /*
                         * Wait for each sector to complete, it's more
                         * reliable.  According to AMD Spec, you must
                         * issue all erase commands within a specified
                         * timeout.  This has been seen to fail, especially
                         * if printf()s are included (for debug)!!
                         */
                        wait_for_DQ7_1(info, sect);
                }
        }

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

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

        /* reset to read mode */
        addr = (CONFIG_SYS_FLASH_WORD_SIZE *) info->start[0];
        addr[0] = (CONFIG_SYS_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));
}

/*-----------------------------------------------------------------------
 * Copy memory to flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 */
#ifdef FLASH_BASE1_PRELIM
static int write_word(flash_info_t * info, ulong dest, ulong data)
{
        if (((info->flash_id & FLASH_TYPEMASK) == FLASH_AM320B) ||
            ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM320T) ||
            ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMLV128U) ||
            ((info->flash_id & FLASH_TYPEMASK) == FLASH_S29GL128N) ||
            ((info->flash_id & FLASH_TYPEMASK) == FLASH_STMW320DT)) {
                return write_word_2(info, dest, data);
        } else {
                return write_word_1(info, dest, data);
        }
}

static int write_word_1(flash_info_t * info, ulong dest, ulong data)
#else
static int write_word(flash_info_t * info, ulong dest, ulong data)
#endif
{
        volatile CONFIG_SYS_FLASH_WORD_SIZE *addr2 = (CONFIG_SYS_FLASH_WORD_SIZE *) (info->start[0]);
        volatile CONFIG_SYS_FLASH_WORD_SIZE *dest2 = (CONFIG_SYS_FLASH_WORD_SIZE *) dest;
        volatile CONFIG_SYS_FLASH_WORD_SIZE *data2 = (CONFIG_SYS_FLASH_WORD_SIZE *) & data;
        ulong start;
        int i;

        /* Check if Flash is (sufficiently) erased */
        if ((*((vu_long *)dest) & data) != data) {
                return 2;
        }

        for (i = 0; i < 4 / sizeof(CONFIG_SYS_FLASH_WORD_SIZE); i++) {
                int flag;

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

                addr2[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00AA00AA;
                addr2[CONFIG_SYS_FLASH_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00550055;
                addr2[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00A000A0;

                dest2[i] = data2[i];

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

                /* data polling for D7 */
                start = get_timer(0);
                while ((dest2[i] & (CONFIG_SYS_FLASH_WORD_SIZE) 0x00800080) !=
                       (data2[i] & (CONFIG_SYS_FLASH_WORD_SIZE) 0x00800080)) {

                        if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
                                return 1;
                        }
                }
        }

        return 0;
}

#ifdef FLASH_BASE1_PRELIM

/*
 * The following code cannot be run from FLASH!
 */
static ulong flash_get_size_2(vu_long * addr, flash_info_t * info)
{
        short i;
        CONFIG_SYS_FLASH_CHAR_SIZE value;
        ulong base = (ulong) addr;
        volatile CONFIG_SYS_FLASH_WORD_SIZE *addr2 = (CONFIG_SYS_FLASH_WORD_SIZE *) addr;

        DEBUGF("FLASH ADDR: %08x\n", (unsigned)addr);

        /* Write auto select command: read Manufacturer ID */
        addr2[CONFIG_SYS_FLASH_CHAR_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0xAAAAAAAA;
        addr2[CONFIG_SYS_FLASH_CHAR_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x55555555;
        addr2[CONFIG_SYS_FLASH_CHAR_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x90909090;
        udelay(1000);

        value = (CONFIG_SYS_FLASH_CHAR_SIZE)addr2[0];
        DEBUGF("FLASH MANUFACT: %x\n", value);

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

        value = (CONFIG_SYS_FLASH_CHAR_SIZE)addr2[2];   /* device ID */
        DEBUGF("\nFLASH DEVICEID: %x\n", value);

        switch (value) {
        case (CONFIG_SYS_FLASH_CHAR_SIZE) AMD_ID_LV040B:
                info->flash_id += FLASH_AM040;
                info->sector_count = 8;
                info->size = 0x0080000; /* => 512 ko */
                break;

        case (CONFIG_SYS_FLASH_CHAR_SIZE) AMD_ID_F040B:
                info->flash_id += FLASH_AM040;
                info->sector_count = 8;
                info->size = 0x0080000; /* => 512 ko */
                break;

        case (CONFIG_SYS_FLASH_CHAR_SIZE) STM_ID_M29W040B:
                info->flash_id += FLASH_AM040;
                info->sector_count = 8;
                info->size = 0x0080000; /* => 512 ko */
                break;

        case (CONFIG_SYS_FLASH_CHAR_SIZE) AMD_ID_F016D:
                info->flash_id += FLASH_AMD016;
                info->sector_count = 32;
                info->size = 0x00200000;
                break;                  /* => 2 MB */

        case (CONFIG_SYS_FLASH_CHAR_SIZE) AMD_ID_LV033C:
                info->flash_id += FLASH_AMDLV033C;
                info->sector_count = 64;
                info->size = 0x00400000;
                break;                  /* => 4 MB */

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

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

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

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

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

        case (CONFIG_SYS_FLASH_CHAR_SIZE) AMD_ID_LV160B:
                info->flash_id += FLASH_AM160B;
                info->sector_count = 35;
                info->size = 0x00200000;
                break;                  /* => 2 MB */
        case (CONFIG_SYS_FLASH_CHAR_SIZE) AMD_ID_MIRROR:
                if ((CONFIG_SYS_FLASH_CHAR_SIZE)addr2[0x1c] == (CONFIG_SYS_FLASH_CHAR_SIZE)AMD_ID_LV128U_2
                                && (CONFIG_SYS_FLASH_CHAR_SIZE)addr2[0x1e] ==  (CONFIG_SYS_FLASH_CHAR_SIZE)AMD_ID_LV128U_3) {
                        info->flash_id += FLASH_AMLV128U;
                        info->sector_count = 256;
                        info->size = 0x01000000;
                } else if ((CONFIG_SYS_FLASH_CHAR_SIZE)addr2[0x1c] == (CONFIG_SYS_FLASH_CHAR_SIZE)AMD_ID_GL128N_2
                                && (CONFIG_SYS_FLASH_CHAR_SIZE)addr2[0x1e] ==  (CONFIG_SYS_FLASH_CHAR_SIZE)AMD_ID_GL128N_3 ) {
                        info->flash_id += FLASH_S29GL128N;
                        info->sector_count = 128;
                        info->size = 0x01000000;
                }
                else
                        info->flash_id = FLASH_UNKNOWN;
                break;                  /* => 2 MB */

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

        /* set up sector start address table */
        if (((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) ||
            ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040) ||
            ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMD016)) {
                for (i = 0; i < info->sector_count; i++)
                        info->start[i] = base + (i * 0x00010000);
        } else if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMLV128U) {
                for (i = 0; i < info->sector_count; i++)
                        info->start[i] = base + (i * 0x00010000);
        } else if ((info->flash_id & FLASH_TYPEMASK) == FLASH_S29GL128N ) {
                for (i = 0; i < info->sector_count; i++)
                        info->start[i] = base + (i * 0x00020000);
        } 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 CONFIG_SYS_FLASH_WORD_SIZE *)(info->start[i]);

                /* For AMD29033C flash we need to resend the command of *
                 * reading flash protection for upper 8 Mb of flash     */
                if (i == 32) {
                        addr2[CONFIG_SYS_FLASH_CHAR_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0xAAAAAAAA;
                        addr2[CONFIG_SYS_FLASH_CHAR_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x55555555;
                        addr2[CONFIG_SYS_FLASH_CHAR_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x90909090;
                }

                if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST)
                        info->protect[i] = 0;
                else
                        info->protect[i] = (CONFIG_SYS_FLASH_CHAR_SIZE)addr2[4] & 1;
        }

        /* issue bank reset to return to read mode */
        addr2[0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0xF0F0F0F0;
        return info->size;
}

static int wait_for_DQ7_2(flash_info_t * info, int sect)
{
        ulong start, now, last;
        volatile CONFIG_SYS_FLASH_WORD_SIZE *addr =
            (CONFIG_SYS_FLASH_WORD_SIZE *) (info->start[sect]);

        start = get_timer(0);
        last = start;
        while (((CONFIG_SYS_FLASH_WORD_SIZE)addr[0] & (CONFIG_SYS_FLASH_WORD_SIZE) 0x80808080) !=
               (CONFIG_SYS_FLASH_WORD_SIZE) 0x80808080) {
                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 */
                        putc('.');
                        last = now;
                }
        }
        return 0;
}

static int flash_erase_2(flash_info_t * info, int s_first, int s_last)
{
        volatile CONFIG_SYS_FLASH_WORD_SIZE *addr = (CONFIG_SYS_FLASH_WORD_SIZE *) (info->start[0]);
        volatile CONFIG_SYS_FLASH_WORD_SIZE *addr2;
        int flag, prot, sect, l_sect;
        int i;

        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) {
                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;

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

        /* Start erase on unprotected sectors */
        for (sect = s_first; sect <= s_last; sect++) {
                if (info->protect[sect] == 0) { /* not protected */
                        addr2 = (CONFIG_SYS_FLASH_WORD_SIZE *) (info->start[sect]);

                        if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) {
                                addr[CONFIG_SYS_FLASH_CHAR_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0xAAAAAAAA;
                                addr[CONFIG_SYS_FLASH_CHAR_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x55555555;
                                addr[CONFIG_SYS_FLASH_CHAR_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x80808080;
                                addr[CONFIG_SYS_FLASH_CHAR_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0xAAAAAAAA;

                                addr[CONFIG_SYS_FLASH_CHAR_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x55555555;
                                addr2[0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x50505050;     /* block erase */
                                for (i = 0; i < 50; i++)
                                        udelay(1000);   /* wait 1 ms */
                        } else {
                                addr[CONFIG_SYS_FLASH_CHAR_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0xAAAAAAAA;
                                addr[CONFIG_SYS_FLASH_CHAR_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x55555555;
                                addr[CONFIG_SYS_FLASH_CHAR_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x80808080;
                                addr[CONFIG_SYS_FLASH_CHAR_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0xAAAAAAAA;
                                addr[CONFIG_SYS_FLASH_CHAR_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x55555555;
                                addr2[0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x30303030;     /* sector erase */
                        }
                        l_sect = sect;
                        /*
                         * Wait for each sector to complete, it's more
                         * reliable.  According to AMD Spec, you must
                         * issue all erase commands within a specified
                         * timeout.  This has been seen to fail, especially
                         * if printf()s are included (for debug)!!
                         */
                        wait_for_DQ7_2(info, sect);
                }
        }

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

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

        /* reset to read mode */
        addr = (CONFIG_SYS_FLASH_WORD_SIZE *) info->start[0];
        addr[0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0xF0F0F0F0; /* reset bank */

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

static int write_word_2(flash_info_t * info, ulong dest, ulong data)
{
        volatile CONFIG_SYS_FLASH_WORD_SIZE *addr2 = (CONFIG_SYS_FLASH_WORD_SIZE *) (info->start[0]);
        volatile CONFIG_SYS_FLASH_WORD_SIZE *dest2 = (CONFIG_SYS_FLASH_WORD_SIZE *) dest;
        volatile CONFIG_SYS_FLASH_WORD_SIZE *data2 = (CONFIG_SYS_FLASH_WORD_SIZE *) & data;
        ulong start;
        int i;

        /* Check if Flash is (sufficiently) erased */
        if ((*((vu_long *)dest) & data) != data) {
                return 2;
        }

        for (i = 0; i < 4 / sizeof(CONFIG_SYS_FLASH_WORD_SIZE); i++) {
                int flag;

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

                addr2[CONFIG_SYS_FLASH_CHAR_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0xAAAAAAAA;
                addr2[CONFIG_SYS_FLASH_CHAR_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x55555555;
                addr2[CONFIG_SYS_FLASH_CHAR_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0xA0A0A0A0;

                dest2[i] = data2[i];

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

                /* data polling for D7 */
                start = get_timer(0);
                while ((dest2[i] & (CONFIG_SYS_FLASH_WORD_SIZE) 0x80808080) !=
                       (data2[i] & (CONFIG_SYS_FLASH_WORD_SIZE) 0x80808080)) {

                        if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
                                return 1;
                        }
                }
        }

        return 0;
}

#endif /* FLASH_BASE1_PRELIM */