/*
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Marius Groeger <mgroeger@sysgo.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>

#define FLASH_BANK_SIZE 0x800000
#define MAIN_SECT_SIZE  0x20000
#define PARAM_SECT_SIZE 0x4000

flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];


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

ulong flash_init (void)
{
        int i, j;
        ulong size = 0;

        for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
                ulong flashbase = 0;

                flash_info[i].flash_id =
                        (INTEL_MANUFACT & FLASH_VENDMASK) |
                        (INTEL_ID_28F320B3T & FLASH_TYPEMASK);
                flash_info[i].size = FLASH_BANK_SIZE;
                flash_info[i].sector_count = CONFIG_SYS_MAX_FLASH_SECT;
                memset (flash_info[i].protect, 0, CONFIG_SYS_MAX_FLASH_SECT);
                if (i == 0)
                        flashbase = PHYS_FLASH_1;
                else if (i == 1)
                        flashbase = PHYS_FLASH_2;
                else
                        panic ("configured too many flash banks!\n");
                for (j = 0; j < flash_info[i].sector_count; j++) {
                        if (j <= 7) {
                                flash_info[i].start[j] =
                                        flashbase + j * PARAM_SECT_SIZE;
                        } else {
                                flash_info[i].start[j] =
                                        flashbase + (j - 7) * MAIN_SECT_SIZE;
                        }
                }
                size += flash_info[i].size;
        }

        /* Protect monitor and environment sectors
         */
        flash_protect (FLAG_PROTECT_SET,
                       CONFIG_SYS_FLASH_BASE,
                       CONFIG_SYS_FLASH_BASE + monitor_flash_len - 1,
                       &flash_info[0]);

        flash_protect (FLAG_PROTECT_SET,
                       CONFIG_ENV_ADDR,
                       CONFIG_ENV_ADDR + CONFIG_ENV_SIZE - 1, &flash_info[0]);

        return size;
}

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

        switch (info->flash_id & FLASH_VENDMASK) {
        case (INTEL_MANUFACT & FLASH_VENDMASK):
                printf ("Intel: ");
                break;
        default:
                printf ("Unknown Vendor ");
                break;
        }

        switch (info->flash_id & FLASH_TYPEMASK) {
        case (INTEL_ID_28F320B3T & FLASH_TYPEMASK):
                printf ("28F320F3B (16Mbit)\n");
                break;
        default:
                printf ("Unknown Chip Type\n");
                goto Done;
                break;
        }

        printf ("  Size: %ld MB in %d Sectors\n",
                info->size >> 20, 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");

      Done:;
}

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

int flash_erase (flash_info_t * info, int s_first, int s_last)
{
        int flag, prot, sect;
        int rc = ERR_OK;

        if (info->flash_id == FLASH_UNKNOWN)
                return ERR_UNKNOWN_FLASH_TYPE;

        if ((s_first < 0) || (s_first > s_last)) {
                return ERR_INVAL;
        }

        if ((info->flash_id & FLASH_VENDMASK) !=
            (INTEL_MANUFACT & FLASH_VENDMASK)) {
                return ERR_UNKNOWN_FLASH_VENDOR;
        }

        prot = 0;
        for (sect = s_first; sect <= s_last; ++sect) {
                if (info->protect[sect]) {
                        prot++;
                }
        }
        if (prot)
                return ERR_PROTECTED;

        /*
         * Disable interrupts which might cause a timeout
         * here. Remember that our exception vectors are
         * at address 0 in the flash, and we don't want a
         * (ticker) exception to happen while the flash
         * chip is in programming mode.
         */
        flag = disable_interrupts ();

        /* Start erase on unprotected sectors */
        for (sect = s_first; sect <= s_last && !ctrlc (); sect++) {

                printf ("Erasing sector %2d ... ", sect);

                /* arm simple, non interrupt dependent timer */
                reset_timer_masked ();

                if (info->protect[sect] == 0) { /* not protected */
                        vu_long *addr = (vu_long *) (info->start[sect]);

                        *addr = 0x00200020;     /* erase setup */
                        *addr = 0x00D000D0;     /* erase confirm */

                        while ((*addr & 0x00800080) != 0x00800080) {
                                if (get_timer_masked () >
                                    CONFIG_SYS_FLASH_ERASE_TOUT) {
                                        *addr = 0x00B000B0;     /* suspend erase */
                                        *addr = 0x00FF00FF;     /* reset to read mode */
                                        rc = ERR_TIMOUT;
                                        goto outahere;
                                }
                        }

                        *addr = 0x00FF00FF;     /* reset to read mode */
                }
                printf ("ok.\n");
        }
        if (ctrlc ())
                printf ("User Interrupt!\n");

      outahere:

        /* allow flash to settle - wait 10 ms */
        udelay_masked (10000);

        if (flag)
                enable_interrupts ();

        return rc;
}

/*-----------------------------------------------------------------------
 * Copy memory to flash
 */

static int write_word (flash_info_t * info, ulong dest, ulong data)
{
        vu_long *addr = (vu_long *) dest;
        ulong barf;
        int rc = ERR_OK;
        int flag;

        /* Check if Flash is (sufficiently) erased
         */
        if ((*addr & data) != data)
                return ERR_NOT_ERASED;

        /*
         * Disable interrupts which might cause a timeout
         * here. Remember that our exception vectors are
         * at address 0 in the flash, and we don't want a
         * (ticker) exception to happen while the flash
         * chip is in programming mode.
         */
        flag = disable_interrupts ();

        /* clear status register command */
        *addr = 0x00500050;

        /* program set-up command */
        *addr = 0x00400040;

        /* latch address/data */
        *addr = data;

        /* arm simple, non interrupt dependent timer */
        reset_timer_masked ();

        /* read status register command */
        *addr = 0x00700070;

        /* wait while polling the status register */
        while ((*addr & 0x00800080) != 0x00800080) {
                if (get_timer_masked () > CONFIG_SYS_FLASH_WRITE_TOUT) {
                        rc = ERR_TIMOUT;
                        /* suspend program command */
                        *addr = 0x00B000B0;
                        goto outahere;
                }

                if (*addr & 0x003A003A) {       /* check for error */
                        barf = *addr;
                        if (barf & 0x003A0000) {
                                barf >>= 16;
                        } else {
                                barf &= 0x0000003A;
                        }
                        printf ("\nFlash write error %02lx at address %08lx\n", barf, (unsigned long) dest);
                        if (barf & 0x0002) {
                                printf ("Block locked, not erased.\n");
                                rc = ERR_NOT_ERASED;
                                goto outahere;
                        }
                        if (barf & 0x0010) {
                                printf ("Programming error.\n");
                                rc = ERR_PROG_ERROR;
                                goto outahere;
                        }
                        if (barf & 0x0008) {
                                printf ("Vpp Low error.\n");
                                rc = ERR_PROG_ERROR;
                                goto outahere;
                        }
                        rc = ERR_PROG_ERROR;
                        goto outahere;
                }
        }


      outahere:
        /* read array command */
        *addr = 0x00FF00FF;

        if (flag)
                enable_interrupts ();

        return rc;
}

/*-----------------------------------------------------------------------
 * Copy memory to flash.
 */

int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
{
        ulong cp, wp, data;
        int l;
        int i, 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 << 24);
                }
                for (; i < 4 && cnt > 0; ++i) {
                        data = (data >> 8) | (*src++ << 24);
                        --cnt;
                        ++cp;
                }
                for (; cnt == 0 && i < 4; ++i, ++cp) {
                        data = (data >> 8) | (*(uchar *) cp << 24);
                }

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

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

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

        /*
         * handle unaligned tail bytes
         */
        data = 0;
        for (i = 0, cp = wp; i < 4 && cnt > 0; ++i, ++cp) {
                data = (data >> 8) | (*src++ << 24);
                --cnt;
        }
        for (; i < 4; ++i, ++cp) {
                data = (data >> 8) | (*(uchar *) cp << 24);
        }

        return write_word (info, wp, data);
}