/*
 * (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
 */

/* #define DEBUG */

#include <common.h>
#include <flash.h>

#if !defined(CONFIG_SYS_NO_FLASH)
#include <mtd/cfi_flash.h>

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

/*-----------------------------------------------------------------------
 * Functions
 */

/*-----------------------------------------------------------------------
 * Set protection status for monitor sectors
 *
 * The monitor is always located in the _first_ Flash bank.
 * If necessary you have to map the second bank at lower addresses.
 */
void
flash_protect (int flag, ulong from, ulong to, flash_info_t *info)
{
        ulong b_end;
        short s_end;
        int i;

        /* Do nothing if input data is bad. */
        if (!info || info->sector_count == 0 || info->size == 0 || to < from) {
                return;
        }

        s_end = info->sector_count - 1; /* index of last sector */
        b_end = info->start[0] + info->size - 1;        /* bank end address */

        debug ("flash_protect %s: from 0x%08lX to 0x%08lX\n",
                (flag & FLAG_PROTECT_SET) ? "ON" :
                        (flag & FLAG_PROTECT_CLEAR) ? "OFF" : "???",
                from, to);

        /* There is nothing to do if we have no data about the flash
         * or the protect range and flash range don't overlap.
         */
        if (info->flash_id == FLASH_UNKNOWN ||
            to < info->start[0] || from > b_end) {
                return;
        }

        for (i=0; i<info->sector_count; ++i) {
                ulong end;              /* last address in current sect */

                end = (i == s_end) ? b_end : info->start[i + 1] - 1;

                /* Update protection if any part of the sector
                 * is in the specified range.
                 */
                if (from <= end && to >= info->start[i]) {
                        if (flag & FLAG_PROTECT_CLEAR) {
#if defined(CONFIG_SYS_FLASH_PROTECTION)
                                flash_real_protect(info, i, 0);
#else
                                info->protect[i] = 0;
#endif  /* CONFIG_SYS_FLASH_PROTECTION */
                                debug ("protect off %d\n", i);
                        }
                        else if (flag & FLAG_PROTECT_SET) {
#if defined(CONFIG_SYS_FLASH_PROTECTION)
                                flash_real_protect(info, i, 1);
#else
                                info->protect[i] = 1;
#endif  /* CONFIG_SYS_FLASH_PROTECTION */
                                debug ("protect on %d\n", i);
                        }
                }
        }
}

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

flash_info_t *
addr2info (ulong addr)
{
#ifndef CONFIG_SPD823TS
        flash_info_t *info;
        int i;

        for (i=0, info = &flash_info[0]; i<CONFIG_SYS_MAX_FLASH_BANKS; ++i, ++info) {
                if (info->flash_id != FLASH_UNKNOWN &&
                    addr >= info->start[0] &&
                    /* WARNING - The '- 1' is needed if the flash
                     * is at the end of the address space, since
                     * info->start[0] + info->size wraps back to 0.
                     * Please don't change this unless you understand this.
                     */
                    addr <= info->start[0] + info->size - 1) {
                        return (info);
                }
        }
#endif /* CONFIG_SPD823TS */

        return (NULL);
}

/*-----------------------------------------------------------------------
 * Copy memory to flash.
 * Make sure all target addresses are within Flash bounds,
 * and no protected sectors are hit.
 * Returns:
 * ERR_OK          0 - OK
 * ERR_TIMOUT      1 - write timeout
 * ERR_NOT_ERASED  2 - Flash not erased
 * ERR_PROTECTED   4 - target range includes protected sectors
 * ERR_INVAL       8 - target address not in Flash memory
 * ERR_ALIGN       16 - target address not aligned on boundary
 *                      (only some targets require alignment)
 */
int
flash_write (char *src, ulong addr, ulong cnt)
{
#ifdef CONFIG_SPD823TS
        return (ERR_TIMOUT);    /* any other error codes are possible as well */
#else
        int i;
        ulong         end        = addr + cnt - 1;
        flash_info_t *info_first = addr2info (addr);
        flash_info_t *info_last  = addr2info (end );
        flash_info_t *info;

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

        if (!info_first || !info_last) {
                return (ERR_INVAL);
        }

        for (info = info_first; info <= info_last; ++info) {
                ulong b_end = info->start[0] + info->size;      /* bank end addr */
                short s_end = info->sector_count - 1;
                for (i=0; i<info->sector_count; ++i) {
                        ulong e_addr = (i == s_end) ? b_end : info->start[i + 1];

                        if ((end >= info->start[i]) && (addr < e_addr) &&
                            (info->protect[i] != 0) ) {
                                return (ERR_PROTECTED);
                        }
                }
        }

        /* finally write data to flash */
        for (info = info_first; info <= info_last && cnt>0; ++info) {
                ulong len;

                len = info->start[0] + info->size - addr;
                if (len > cnt)
                        len = cnt;
                if ((i = write_buff(info, (uchar *)src, addr, len)) != 0) {
                        return (i);
                }
                cnt  -= len;
                addr += len;
                src  += len;
        }
        return (ERR_OK);
#endif /* CONFIG_SPD823TS */
}

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

void flash_perror (int err)
{
        switch (err) {
        case ERR_OK:
                break;
        case ERR_TIMOUT:
                puts ("Timeout writing to Flash\n");
                break;
        case ERR_NOT_ERASED:
                puts ("Flash not Erased\n");
                break;
        case ERR_PROTECTED:
                puts ("Can't write to protected Flash sectors\n");
                break;
        case ERR_INVAL:
                puts ("Outside available Flash\n");
                break;
        case ERR_ALIGN:
                puts ("Start and/or end address not on sector boundary\n");
                break;
        case ERR_UNKNOWN_FLASH_VENDOR:
                puts ("Unknown Vendor of Flash\n");
                break;
        case ERR_UNKNOWN_FLASH_TYPE:
                puts ("Unknown Type of Flash\n");
                break;
        case ERR_PROG_ERROR:
                puts ("General Flash Programming Error\n");
                break;
        default:
                printf ("%s[%d] FIXME: rc=%d\n", __FILE__, __LINE__, err);
                break;
        }
}

/*-----------------------------------------------------------------------
 */
#endif /* !CONFIG_SYS_NO_FLASH */