/*
 * (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 0x1000000
#define MAIN_SECT_SIZE  0x20000

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_28F128J3 & 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
                        panic ("configured too many flash banks!\n");
                for (j = 0; j < flash_info[i].sector_count; j++) {
                        flash_info[i].start[j] = flashbase + j * 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_28F128J3 & FLASH_TYPEMASK):
                printf ("28F128J3 (128Mbit)\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_short *addr = (vu_short *) (info->start[sect]);

                        *addr = 0x20;           /* erase setup */
                        *addr = 0xD0;           /* erase confirm */

                        while ((*addr & 0x80) != 0x80) {
                                if (get_timer_masked () > CONFIG_SYS_FLASH_ERASE_TOUT) {
                                        *addr = 0xB0;   /* suspend erase */
                                        *addr = 0xFF;   /* reset to read mode */
                                        rc = ERR_TIMOUT;
                                        goto outahere;
                                }
                        }

                        /* clear status register command */
                        *addr = 0x50;
                        /* reset to read mode */
                        *addr = 0xFF;
                }
                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, ushort data)
{
        vu_short *addr = (vu_short *) dest, val;
        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 = 0x50;

        /* program set-up command */
        *addr = 0x40;

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

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

        /* wait while polling the status register */
        while (((val = *addr) & 0x80) != 0x80) {
                if (get_timer_masked () > CONFIG_SYS_FLASH_WRITE_TOUT) {
                        rc = ERR_TIMOUT;
                        /* suspend program command */
                        *addr = 0xB0;
                        goto outahere;
                }
        }

        if (val & 0x1A) {                       /* check for error */
                printf ("\nFlash write error %02x at address %08lx\n",
                                (int) val, (unsigned long) dest);
                if (val & (1 << 3)) {
                        printf ("Voltage range error.\n");
                        rc = ERR_PROG_ERROR;
                        goto outahere;
                }
                if (val & (1 << 1)) {
                        printf ("Device protect error.\n");
                        rc = ERR_PROTECTED;
                        goto outahere;
                }
                if (val & (1 << 4)) {
                        printf ("Programming error.\n");
                        rc = ERR_PROG_ERROR;
                        goto outahere;
                }
                rc = ERR_PROG_ERROR;
                goto outahere;
        }

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

        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;
        ushort data;
        int l;
        int i, rc;

        wp = (addr & ~1);                       /* 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 << 8);
                }
                for (; i < 2 && cnt > 0; ++i) {
                        data = (data >> 8) | (*src++ << 8);
                        --cnt;
                        ++cp;
                }
                for (; cnt == 0 && i < 2; ++i, ++cp) {
                        data = (data >> 8) | (*(uchar *) cp << 8);
                }

                if ((rc = write_word (info, wp, data)) != 0) {
                        return (rc);
                }
                wp += 2;
        }

        /*
         * handle word aligned part
         */
        while (cnt >= 2) {
                data = *((vu_short *) src);
                if ((rc = write_word (info, wp, data)) != 0) {
                        return (rc);
                }
                src += 2;
                wp += 2;
                cnt -= 2;
        }

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

        /*
         * handle unaligned tail bytes
         */
        data = 0;
        for (i = 0, cp = wp; i < 2 && cnt > 0; ++i, ++cp) {
                data = (data >> 8) | (*src++ << 8);
                --cnt;
        }
        for (; i < 2; ++i, ++cp) {
                data = (data >> 8) | (*(uchar *) cp << 8);
        }

        return write_word (info, wp, data);
}