/*
 * (C) Copyright 2001
 * Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc.
 *
 * 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
 */

/*
 * flash.c - flash support for the 512k, 8bit boot flash
        and the 8MB 32bit extra flash on the DB64360
 *           most of this file was based on the existing U-Boot
 *           flash drivers.
 *
 * written or collected and sometimes rewritten by
 * Ingo Assmus <ingo.assmus@keymile.com>
 *
 */

#include <common.h>
#include <mpc8xx.h>
#include "../include/mv_gen_reg.h"
#include "../include/memory.h"
#include "intel_flash.h"

#define FLASH_ROM       0xFFFD  /* unknown flash type                   */
#define FLASH_RAM       0xFFFE  /* unknown flash type                   */
#define FLASH_MAN_UNKNOWN 0xFFFF0000

/* #define DEBUG */

/* Intel flash commands */
int flash_erase_intel (flash_info_t * info, int s_first, int s_last);
int write_word_intel (bank_addr_t addr, bank_word_t value);

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

/*-----------------------------------------------------------------------
 * Functions
 */
static ulong flash_get_size (int portwidth, vu_long * addr,
                             flash_info_t * info);
static int write_word (flash_info_t * info, ulong dest, ulong data);
static void flash_get_offsets (ulong base, flash_info_t * info);

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

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

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

        /* the boot flash */
        base = CONFIG_SYS_FLASH_BASE;
        size_b0 =
                flash_get_size (CONFIG_SYS_BOOT_FLASH_WIDTH, (vu_long *) base,
                                &flash_info[0]);

        printf ("[%ldkB@%lx] ", size_b0 / 1024, base);

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

        base = memoryGetDeviceBaseAddress (CONFIG_SYS_EXTRA_FLASH_DEVICE);
/*      base = memoryGetDeviceBaseAddress(DEV_CS3_BASE_ADDR);*/
        for (i = 1; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
                unsigned long size =
                        flash_get_size (CONFIG_SYS_EXTRA_FLASH_WIDTH,
                                        (vu_long *) base, &flash_info[i]);

                printf ("[%ldMB@%lx] ", size >> 20, base);

                if (flash_info[i].flash_id == FLASH_UNKNOWN) {
                        if (i == 1) {
                                printf ("## Unknown FLASH at %08lx: Size = 0x%08lx = %ld MB\n", base, size_b1, size_b1 << 20);
                        }
                        break;
                }
                size_b1 += size;
                base += size;
        }

        flash_size = size_b0 + size_b1;
        return flash_size;
}

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

        if (!info->sector_count)
                return;

        /* set up sector start address table */
        switch (info->flash_id & FLASH_TYPEMASK) {
        case FLASH_AM040:
        case FLASH_28F128J3A:
        case FLASH_28F640J3A:
        case FLASH_RAM:
                /* this chip has uniformly spaced sectors */
                sector_size = info->size / info->sector_count;
                for (i = 0; i < info->sector_count; i++)
                        info->start[i] = base + (i * sector_size);
                break;
        default:
                if (info->flash_id & FLASH_BTYPE) {
                        /* set sector offsets for bottom boot block type    */
                        info->start[0] = base + 0x00000000;
                        info->start[1] = base + 0x00008000;
                        info->start[2] = base + 0x0000C000;
                        info->start[3] = base + 0x00010000;
                        for (i = 4; i < info->sector_count; i++) {
                                info->start[i] =
                                        base + (i * 0x00020000) - 0x00060000;
                        }
                } else {
                        /* set sector offsets for top boot block type               */
                        i = info->sector_count - 1;
                        info->start[i--] = base + info->size - 0x00008000;
                        info->start[i--] = base + info->size - 0x0000C000;
                        info->start[i--] = base + info->size - 0x00010000;
                        for (; i >= 0; i--) {
                                info->start[i] = base + i * 0x00020000;
                        }
                }
        }
}

/*-----------------------------------------------------------------------
 */
void flash_print_info (flash_info_t * info)
{
        int i;

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

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

        switch (info->flash_id & FLASH_TYPEMASK) {
        case FLASH_AM040:
                printf ("AM29LV040B (4 Mbit, bottom boot sect)\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_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_28F640J3A:
                printf ("28F640J3A (64 Mbit)\n");
                break;
        case FLASH_28F128J3A:
                printf ("28F128J3A (128 Mbit)\n");
                break;
        case FLASH_ROM:
                printf ("ROM\n");
                break;
        case FLASH_RAM:
                printf ("RAM\n");
                break;
        default:
                printf ("Unknown Chip Type\n");
                break;
        }

        if ((info->size >> 20) > 0) {
                printf ("  Size: %ld MB in %d Sectors\n",
                        info->size >> 20, info->sector_count);
        } else {
                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) {
                if ((i % 5) == 0)
                        printf ("\n   ");
                printf (" %08lX%s",
                        info->start[i], info->protect[i] ? " (RO)" : "     ");
        }
        printf ("\n");
        return;
}

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


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

/*
 * The following code cannot be run from FLASH!
 */

static inline void flash_cmd (int width, volatile unsigned char *addr,
                              int offset, unsigned char cmd)
{
        /* supports 1x8, 1x16, and 2x16 */
        /* 2x8 and 4x8 are not supported */
        if (width == 4) {
                /* assuming chips are in 16 bit mode */
                /* 2x16 */
                unsigned long cmd32 = (cmd << 16) | cmd;

                *(volatile unsigned long *) (addr + offset * 2) = cmd32;
        } else {
                /* 1x16 or 1x8 */
                *(volatile unsigned char *) (addr + offset) = cmd;
        }
}

static ulong
flash_get_size (int portwidth, vu_long * addr, flash_info_t * info)
{
        short i;
        volatile unsigned char *caddr = (unsigned char *) addr;
        volatile unsigned short *saddr = (unsigned short *) addr;
        volatile unsigned long *laddr = (unsigned long *) addr;
        char old[2], save;
        ulong id = 0, manu = 0, base = (ulong) addr;

#ifdef DEBUG
        printf ("%s: enter\n", __FUNCTION__);
#endif
        info->portwidth = portwidth;

        save = *caddr;

        flash_cmd (portwidth, caddr, 0, 0xf0);
        flash_cmd (portwidth, caddr, 0, 0xf0);

        udelay (10);

        old[0] = caddr[0];
        old[1] = caddr[1];


        if (old[0] != 0xf0) {
                flash_cmd (portwidth, caddr, 0, 0xf0);
                flash_cmd (portwidth, caddr, 0, 0xf0);

                udelay (10);

                if (*caddr == 0xf0) {
                        /* this area is ROM */
                        *caddr = save;
                        info->flash_id = FLASH_ROM + FLASH_MAN_UNKNOWN;
                        info->sector_count = 8;
                        info->size = 0x80000;
                        flash_get_offsets (base, info);
                        return info->size;
                }
        } else {
                *caddr = 0;

                udelay (10);

                if (*caddr == 0) {
                        /* this area is RAM */
                        *caddr = save;
                        info->flash_id = FLASH_RAM + FLASH_MAN_UNKNOWN;
                        info->sector_count = 8;
                        info->size = 0x80000;
                        flash_get_offsets (base, info);
                        return info->size;
                }
                flash_cmd (portwidth, caddr, 0, 0xf0);

                udelay (10);
        }

        /* Write auto select command: read Manufacturer ID */
        flash_cmd (portwidth, caddr, 0x555, 0xAA);
        flash_cmd (portwidth, caddr, 0x2AA, 0x55);
        flash_cmd (portwidth, caddr, 0x555, 0x90);

        udelay (10);

        if ((caddr[0] == old[0]) && (caddr[1] == old[1])) {

                /* this area is ROM */
                info->flash_id = FLASH_ROM + FLASH_MAN_UNKNOWN;
                info->sector_count = 8;
                info->size = 0x80000;
                flash_get_offsets (base, info);
                return info->size;
#ifdef DEBUG
        } else {
                printf ("%px%d: %02x:%02x -> %02x:%02x\n",
                        caddr, portwidth, old[0], old[1], caddr[0], caddr[1]);
#endif
        }

        switch (portwidth) {
        case 1:
                manu = caddr[0];
                manu |= manu << 16;
                id = caddr[1];
                break;
        case 2:
                manu = saddr[0];
                manu |= manu << 16;
                id = saddr[1];
                id |= id << 16;
                break;
        case 4:
                manu = laddr[0];
                id = laddr[1];
                break;
        }

#ifdef DEBUG
        flash_cmd (portwidth, caddr, 0, 0xf0);

        printf ("\n%08lx:%08lx:%08lx\n", base, manu, id);
        printf ("%08lx %08lx %08lx %08lx\n",
                laddr[0], laddr[1], laddr[2], laddr[3]);
#endif

        switch (manu) {
        case STM_MANUFACT:
                info->flash_id = FLASH_MAN_STM;
                break;
        case AMD_MANUFACT:
                info->flash_id = FLASH_MAN_AMD;
                break;
        case FUJ_MANUFACT:
                info->flash_id = FLASH_MAN_FUJ;
                break;
        case INTEL_MANUFACT:
                info->flash_id = FLASH_MAN_INTEL;
                break;
        default:
                flash_cmd (portwidth, caddr, 0, 0xf0);

                printf ("Unknown Mfr [%08lx]:%08lx\n", manu, id);
                info->flash_id = FLASH_UNKNOWN;
                info->sector_count = 0;
                info->size = 0;
                return (0);     /* no or unknown flash  */
        }

        switch (id) {
        case AMD_ID_LV400T:
                info->flash_id += FLASH_AM400T;
                info->sector_count = 11;
                info->size = 0x00100000;
                info->chipwidth = 1;
                break;          /* => 1 MB      */

        case AMD_ID_LV400B:
                info->flash_id += FLASH_AM400B;
                info->sector_count = 11;
                info->size = 0x00100000;
                info->chipwidth = 1;
                break;          /* => 1 MB      */

        case AMD_ID_LV800T:
                info->flash_id += FLASH_AM800T;
                info->sector_count = 19;
                info->size = 0x00200000;
                info->chipwidth = 1;
                break;          /* => 2 MB      */

        case AMD_ID_LV800B:
                info->flash_id += FLASH_AM800B;
                info->sector_count = 19;
                info->size = 0x00200000;
                info->chipwidth = 1;
                break;          /* => 2 MB      */

        case AMD_ID_LV160T:
                info->flash_id += FLASH_AM160T;
                info->sector_count = 35;
                info->size = 0x00400000;
                info->chipwidth = 1;
                break;          /* => 4 MB      */

        case AMD_ID_LV160B:
                info->flash_id += FLASH_AM160B;
                info->sector_count = 35;
                info->size = 0x00400000;
                info->chipwidth = 1;
                break;          /* => 4 MB      */
#if 0                           /* enable when device IDs are available */
        case AMD_ID_LV320T:
                info->flash_id += FLASH_AM320T;
                info->sector_count = 67;
                info->size = 0x00800000;
                break;          /* => 8 MB      */

        case AMD_ID_LV320B:
                info->flash_id += FLASH_AM320B;
                info->sector_count = 67;
                info->size = 0x00800000;
                break;          /* => 8 MB      */
#endif
        case AMD_ID_LV040B:
                info->flash_id += FLASH_AM040;
                info->sector_count = 8;
                info->size = 0x80000;
                info->chipwidth = 1;
                break;          /* => 512 kB    */

        case INTEL_ID_28F640J3A:
                info->flash_id += FLASH_28F640J3A;
                info->sector_count = 64;
                info->size = 128 * 1024 * 64;   /* 128kbytes x 64 blocks */
                info->chipwidth = 2;
                if (portwidth == 4)
                        info->size *= 2;        /* 2x16 */
                break;

        case INTEL_ID_28F128J3A:
                info->flash_id += FLASH_28F128J3A;
                info->sector_count = 128;
                info->size = 128 * 1024 * 128;  /* 128kbytes x 128 blocks */
                info->chipwidth = 2;
                if (portwidth == 4)
                        info->size *= 2;        /* 2x16 */
                break;

        default:
                flash_cmd (portwidth, caddr, 0, 0xf0);

                printf ("Unknown id %lx:[%lx]\n", manu, id);
                info->flash_id = FLASH_UNKNOWN;
                info->chipwidth = 1;
                return (0);     /* => no or unknown flash */

        }

        flash_get_offsets (base, info);


        /* 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 */
                caddr = (volatile unsigned char *) (info->start[i]);
                saddr = (volatile unsigned short *) (info->start[i]);
                laddr = (volatile unsigned long *) (info->start[i]);
                if (portwidth == 1)
                        info->protect[i] = caddr[2] & 1;
                else if (portwidth == 2)
                        info->protect[i] = saddr[2] & 1;
                else
                        info->protect[i] = laddr[2] & 1;
        }

        /*
         * Prevent writes to uninitialized FLASH.
         */
        if (info->flash_id != FLASH_UNKNOWN) {
                caddr = (volatile unsigned char *) info->start[0];

                flash_cmd (portwidth, caddr, 0, 0xF0);  /* reset bank */
        }

        return (info->size);
}

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

/* modified to support 2x16 Intel flash */
/* Note that the code will not exit on a flash erasure error or timeout */
/* but will print and error message and continue processing sectors */
/* until they are all erased. */
/* 10-16-2002 P. Marchese */
        ulong mask;
        int timeout;

        if (info->portwidth == 4)
/*              {
                printf ("- Warning: erasing of 32Bit (2*16Bit i.e. 2*28F640J3A) not supported yet !!!! \n");
                return 1;
                }*/
        {
                /* make sure it's Intel flash */
                if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL) {
                        /* yup! it's an Intel flash */
                        /* is it 16-bits wide? */
                        if (info->chipwidth == 2) {
                                /* yup! it's 16-bits wide */
                                /* are there any sectors to process? */
                                if ((s_first < 0) || (s_first > s_last)) {
                                        printf ("Error:  There are no sectors to erase\n");
                                        printf ("Either sector %d is less than zero\n", s_first);
                                        printf ("or sector %d is greater than sector %d\n", s_first, s_last);
                                        return 1;
                                }
                                /* check for protected sectors */
                                prot = 0;
                                for (sect = s_first; sect <= s_last; ++sect)
                                        if (info->protect[sect])
                                                prot++;
                                /* if variable "prot" is nonzero, there are protected sectors */
                                if (prot)
                                        printf ("- Warning: %d protected sectors will not be erased!\n", prot);
                                /* reset the flash */
                                flash_cmd (info->portwidth, addr, 0,
                                           CHIP_CMD_RST);
                                /* Disable interrupts which might cause a timeout here */
                                flag = disable_interrupts ();
                                /* Clear the status register */
                                flash_cmd (info->portwidth, addr, 0,
                                           CHIP_CMD_CLR_STAT);
                                flash_cmd (info->portwidth, addr, 0,
                                           CHIP_CMD_RST);
                                /* Start erase on unprotected sectors */
                                for (sect = s_first; sect <= s_last; sect++) {
                                        /* is the sector unprotected? */
                                        if (info->protect[sect] == 0) { /* not protected */
                                                /* issue the single block erase command, 0x20 */
                                                flash_cmd (info->portwidth,
                                                           (volatile unsigned
                                                            char *) info->
                                                           start[sect], 0,
                                                           CHIP_CMD_ERASE1);
                                                /* issue the erase confirm command, 0xD0 */
                                                flash_cmd (info->portwidth,
                                                           (volatile unsigned
                                                            char *) info->
                                                           start[sect], 0,
                                                           CHIP_CMD_ERASE2);
                                                l_sect = sect;
                                                /* re-enable interrupts if necessary */
                                                if (flag)
                                                        enable_interrupts ();
                                                /* poll for erasure completion */
                                                /* put flash into read status mode by writing 0x70 to it */
                                                flash_cmd (info->portwidth,
                                                           addr, 0,
                                                           CHIP_CMD_RD_STAT);
                                                /* setup the status register mask */
                                                mask = CHIP_STAT_RDY |
                                                        (CHIP_STAT_RDY << 16);
                                                /* init. the timeout counter */
                                                start = get_timer (0);
                                                /* keep looping while the flash is not ready */
                                                /* exit the loop by timing out or the flash */
                                                /* becomes ready again */
                                                timeout = 0;
                                                while ((*
                                                        (volatile unsigned
                                                         long *) info->
                                                        start[sect] & mask) !=
                                                       mask) {
                                                        /* has the timeout limit been reached? */
                                                        if (get_timer (start)
                                                            >
                                                            CONFIG_SYS_FLASH_ERASE_TOUT)
                                                        {
                                                                /* timeout limit reached */
                                                                printf ("Time out limit reached erasing sector at address %08lx\n", info->start[sect]);
                                                                printf ("Continuing with next sector\n");
                                                                timeout = 1;
                                                                goto timed_out_error;
                                                        }
                                                        /* put flash into read status mode by writing 0x70 to it */
                                                        flash_cmd (info->
                                                                   portwidth,
                                                                   addr, 0,
                                                                   CHIP_CMD_RD_STAT);
                                                }
                                                /* did we timeout? */
                                              timed_out_error:if (timeout == 0)
                                                {
                                                        /* didn't timeout, so check the status register */
                                                        /* create the status mask to check for errors */
                                                        mask = CHIP_STAT_ECLBS;
                                                        mask = mask | (mask <<
                                                                       16);
                                                        /* put flash into read status mode by writing 0x70 to it */
                                                        flash_cmd (info->
                                                                   portwidth,
                                                                   addr, 0,
                                                                   CHIP_CMD_RD_STAT);
                                                        /* are there any errors? */
                                                        if ((*
                                                             (volatile
                                                              unsigned long *)
                                                             info->
                                                             start[sect] &
                                                             mask) != 0) {
                                                                /* We got an erasure error */
                                                                printf ("Flash erasure error at address 0x%08lx\n", info->start[sect]);
                                                                printf ("Continuing with next sector\n");
                                                                /* reset the flash */
                                                                flash_cmd
                                                                        (info->
                                                                         portwidth,
                                                                         addr,
                                                                         0,
                                                                         CHIP_CMD_RST);
                                                        }
                                                }
                                                /* erasure completed without errors */
                                                /* reset the flash */
                                                flash_cmd (info->portwidth,
                                                           addr, 0,
                                                           CHIP_CMD_RST);
                                        }       /* end if not protected */
                                }       /* end for loop */
                                printf ("Flash erasure done\n");
                                return 0;
                        } else {
                                /* The Intel flash is not 16-bit wide */
                                /* print and error message and return */
                                /* NOTE: you can add routines here to handle other size flash */
                                printf ("Error: Intel flash device is only %d-bits wide\n", info->chipwidth * 8);
                                printf ("The erasure code only handles Intel 16-bit wide flash memory\n");
                                return 1;
                        }
                } else {
                        /* Not Intel flash so return an error as a write timeout */
                        /* NOTE: if it's another type flash, stick its routine here */
                        printf ("Error: The flash device is not Intel type\n");
                        printf ("The erasure code only supports Intel flash in a 32-bit port width\n");
                        return 1;
                }
        }

        /* end 32-bit wide flash code */
        if ((info->flash_id & FLASH_TYPEMASK) == FLASH_ROM)
                return 1;       /* Rom can not be erased */
        if ((info->flash_id & FLASH_TYPEMASK) == FLASH_RAM) {   /* RAM just copy 0s to RAM */
                for (sect = s_first; sect <= s_last; sect++) {
                        int sector_size = info->size / info->sector_count;

                        addr = (uchar *) (info->start[sect]);
                        memset ((void *) addr, 0, sector_size);
                }
                return 0;
        }

        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_VENDMASK) == FLASH_MAN_INTEL) {     /* Intel works spezial */
                return flash_erase_intel (info,
                                          (unsigned short) s_first,
                                          (unsigned short) s_last);
        }
#if 0
        if ((info->flash_id == FLASH_UNKNOWN) ||        /* Flash is unknown to PPCBoot */
            (info->flash_id > FLASH_AMD_COMP)) {
                printf ("Can't erase unknown flash type %08lx - aborted\n",
                        info->flash_id);
                return 1;
        }
#endif

        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 ();

        flash_cmd (info->portwidth, addr, 0x555, 0xAA); /* start erase routine */
        flash_cmd (info->portwidth, addr, 0x2AA, 0x55);
        flash_cmd (info->portwidth, addr, 0x555, 0x80);
        flash_cmd (info->portwidth, addr, 0x555, 0xAA);
        flash_cmd (info->portwidth, addr, 0x2AA, 0x55);

        /* Start erase on unprotected sectors */
        for (sect = s_first; sect <= s_last; sect++) {
                if (info->protect[sect] == 0) { /* not protected */
                        addr = (uchar *) (info->start[sect]);
                        flash_cmd (info->portwidth, addr, 0, 0x30);
                        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 = (volatile unsigned char *) (info->start[l_sect]);
        /* broken for 2x16: TODO */
        while ((addr[0] & 0x80) != 0x80) {
                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;
                }
        }

      DONE:
        /* reset to read mode */
        addr = (volatile unsigned char *) info->start[0];
        flash_cmd (info->portwidth, addr, 0, 0xf0);
        flash_cmd (info->portwidth, addr, 0, 0xf0);

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

/*-----------------------------------------------------------------------
 * Copy memory to flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 */

/* broken for 2x16: TODO */
int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
{
        ulong cp, wp, data;
        int i, l, rc;

/* Commented out since the below code should work for 32-bit(2x 16 flash) */
/* 10-16-2002 P. Marchese */
/*      if(info->portwidth==4) return 1; */
/*      if(info->portwidth==4) {
                printf ("- Warning: writting of 32Bit (2*16Bit i.e. 2*28F640J3A) not supported yet !!!! \n");
                return 1;
                }*/

        if ((info->flash_id & FLASH_TYPEMASK) == FLASH_ROM)
                return 0;
        if ((info->flash_id & FLASH_TYPEMASK) == FLASH_RAM) {
                memcpy ((void *) addr, src, cnt);
                return 0;
        }

        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
 */
/* broken for 2x16: TODO */
static int write_word (flash_info_t * info, ulong dest, ulong data)
{
        volatile unsigned char *addr = (uchar *) (info->start[0]);
        ulong start;
        int flag, i;
        ulong mask;

/* modified so that it handles 32-bit(2x16 Intel flash programming */
/* 10-16-2002 P. Marchese */

        if (info->portwidth == 4)
/*              {
                printf ("- Warning: writting of 32Bit (2*16Bit i.e. 2*28F640J3A) not supported yet !!!! \n");
                return 1;
                }*/
        {
                /* make sure it's Intel flash */
                if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL) {
                        /* yup! it's an Intel flash */
                        /* is it 16-bits wide? */
                        if (info->chipwidth == 2) {
                                /* yup! it's 16-bits wide */
                                /* so we know how to program it */
                                /* reset the flash */
                                flash_cmd (info->portwidth, addr, 0,
                                           CHIP_CMD_RST);
                                /* Disable interrupts which might cause a timeout here */
                                flag = disable_interrupts ();
                                /* Clear the status register */
                                flash_cmd (info->portwidth, addr, 0,
                                           CHIP_CMD_CLR_STAT);
                                flash_cmd (info->portwidth, addr, 0,
                                           CHIP_CMD_RST);
                                /* 1st cycle of word/byte program */
                                /* write 0x40 to the location to program */
                                flash_cmd (info->portwidth, (uchar *) dest, 0,
                                           CHIP_CMD_PROG);
                                /* 2nd cycle of word/byte program */
                                /* write the data to the destination address */
                                *(ulong *) dest = data;
                                /* re-enable interrupts if necessary */
                                if (flag)
                                        enable_interrupts ();
                                /* setup the status register mask */
                                mask = CHIP_STAT_RDY | (CHIP_STAT_RDY << 16);
                                /* put flash into read status mode by writing 0x70 to it */
                                flash_cmd (info->portwidth, addr, 0,
                                           CHIP_CMD_RD_STAT);
                                /* init. the timeout counter */
                                start = get_timer (0);
                                /* keep looping while the flash is not ready */
                                /* exit the loop by timing out or the flash */
                                /* becomes ready again */
/* 11-13-2002 Paul Marchese */
/* modified while loop conditional statement */
/* because we were always timing out.  */
/* there is a type mismatch, "addr[0]" */
/* returns a byte but "mask" is a 32-bit value */
                                while ((*(volatile unsigned long *) info->
                                        start[0] & mask) != mask)
/* original code */
/* while (addr[0] & mask) != mask) */
                                {
                                        /* has the timeout limit been reached? */
                                        if (get_timer (start) >
                                            CONFIG_SYS_FLASH_WRITE_TOUT) {
                                                /* timeout limit reached */
                                                printf ("Time out limit reached programming address %08lx with data %08lx\n", dest, data);
                                                /* reset the flash */
                                                flash_cmd (info->portwidth,
                                                           addr, 0,
                                                           CHIP_CMD_RST);
                                                return (1);
                                        }
                                        /* put flash into read status mode by writing 0x70 to it */
                                        flash_cmd (info->portwidth, addr, 0,
                                                   CHIP_CMD_RD_STAT);
                                }
                                /* flash is ready, so check the status */
                                /* create the status mask to check for errors */
                                mask = CHIP_STAT_DPS | CHIP_STAT_VPPS |
                                        CHIP_STAT_PSLBS;
                                mask = mask | (mask << 16);
                                /* put flash into read status mode by writing 0x70 to it */
                                flash_cmd (info->portwidth, addr, 0,
                                           CHIP_CMD_RD_STAT);
                                /* are there any errors? */
                                if ((addr[0] & mask) != 0) {
                                        /* We got a one of the following errors: */
                                        /* Voltage range, Device protect, or programming */
                                        /* return the error as a device timeout */
                                        /* put flash into read status mode by writing 0x70 to it */
                                        flash_cmd (info->portwidth, addr, 0,
                                                   CHIP_CMD_RD_STAT);
                                        printf ("Flash programming error at address 0x%08lx\n", dest);
                                        printf ("Flash status register contains 0x%08lx\n", (unsigned long) addr[0]);
                                        /* reset the flash */
                                        flash_cmd (info->portwidth, addr, 0,
                                                   CHIP_CMD_RST);
                                        return 1;
                                }
                                /* write completed without errors */
                                /* reset the flash */
                                flash_cmd (info->portwidth, addr, 0,
                                           CHIP_CMD_RST);
                                return 0;
                        } else {

                                /* it's not 16-bits wide, so return an error as a write timeout */
                                /* NOTE: you can add routines here to handle other size flash */
                                printf ("Error: Intel flash device is only %d-bits wide\n", info->chipwidth * 8);
                                printf ("The write code only handles Intel 16-bit wide flash memory\n");
                                return 1;
                        }
                } else {
                        /* not Intel flash so return an error as a write timeout */
                        /* NOTE: if it's another type flash, stick its routine here */
                        printf ("Error: The flash device is not Intel type\n");
                        printf ("The code only supports Intel flash in a 32-bit port width\n");
                        return 1;
                }
        }

        /* end of 32-bit flash code */
        if ((info->flash_id & FLASH_TYPEMASK) == FLASH_ROM)
                return 1;
        if ((info->flash_id & FLASH_TYPEMASK) == FLASH_RAM) {
                *(unsigned long *) dest = data;
                return 0;
        }
        if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL) {
                unsigned short low = data & 0xffff;
                unsigned short hi = (data >> 16) & 0xffff;
                int ret = write_word_intel ((bank_addr_t) dest, hi);

                if (!ret)
                        ret = write_word_intel ((bank_addr_t) (dest + 2),
                                                low);

                return ret;
        }

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

        /* first, perform an unlock bypass command to speed up flash writes */
        addr[0x555] = 0xAA;
        addr[0x2AA] = 0x55;
        addr[0x555] = 0x20;

        /* write each byte out */
        for (i = 0; i < 4; i++) {
                char *data_ch = (char *) &data;

                addr[0] = 0xA0;
                *(((char *) dest) + i) = data_ch[i];
                udelay (10);    /* XXX */
        }

        /* we're done, now do an unlock bypass reset */
        addr[0] = 0x90;
        addr[0] = 0x00;

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

        /* data polling for D7 */
        start = get_timer (0);
        while ((*((vu_long *) dest) & 0x00800080) != (data & 0x00800080)) {
                if (get_timer (start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
                        return (1);
                }
        }
        return (0);
}