/*
 * (C) Copyright 2000-2004
 * 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
 */


#include <common.h>
#include <nios.h>

flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];

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

        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 char *) info->start[i];
                for (k = 0; k < size; k++) {
                        if (*flash++ != 0xff) {
                                erased = 0;
                                break;
                        }
                }

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

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


int flash_erase (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 prot, sect;
        unsigned oldpri;
        ulong start;

        /* Some sanity checking */
        if ((s_first < 0) || (s_first > s_last)) {
                printf ("- no sectors to erase\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");
        }

#ifdef DEBUG
        for (sect = s_first; sect <= s_last; sect++) {
                printf("- Erase: Sect: %i @ 0x%08x\n", sect,  info->start[sect]);
        }
#endif

        /* NOTE: disabling interrupts on Nios can be very bad since it
         * also disables the LO_LIMIT exception. It's better here to
         * set the interrupt priority to 3 & restore it when we're done.
         */
        oldpri = ipri (3);

        /* It's ok to erase multiple sectors provided we don't delay more
         * than 50 usec between cmds ... at which point the erase time-out
         * occurs. So don't go and put printf() calls in the loop ... it
         * won't be very helpful ;-)
         */
        for (sect = s_first; sect <= s_last; sect++) {
                if (info->protect[sect] == 0) { /* not protected */
                        addr2 = (CONFIG_SYS_FLASH_WORD_SIZE *) (info->start[sect]);
                        *addr = 0xaa;
                        *addr = 0x55;
                        *addr = 0x80;
                        *addr = 0xaa;
                        *addr = 0x55;
                        *addr2 = 0x30;
                        /* Now just wait for 0xff & provide some user
                         * feedback while we wait. Here we have to grant
                         * timer interrupts. Otherwise get_timer() can't
                         * work right. */
                        ipri(oldpri);
                        start = get_timer (0);
                        while (*addr2 != 0xff) {
                                udelay (1000 * 1000);
                                putc ('.');
                                if (get_timer (start) > CONFIG_SYS_FLASH_ERASE_TOUT) {
                                        printf ("timeout\n");
                                        return 1;
                                }
                        }
                        oldpri = ipri (3); /* disallow non important irqs again */
                }
        }

        printf ("\n");

        /* Restore interrupt priority */
        ipri (oldpri);

        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)
{

        vu_char *cmd = (vu_char *) info->start[0];
        vu_char *dst = (vu_char *) addr;
        unsigned char b;
        unsigned oldpri;
        ulong start;

        while (cnt) {
                /* Check for sufficient erase */
                b = *src;
                if ((*dst & b) != b) {
                        printf ("%02x : %02x\n", *dst, b);
                        return (2);
                }

                /* Disable interrupts other than window underflow
                 * (interrupt priority 2)
                 */
                oldpri = ipri (3);
                *cmd = 0xaa;
                *cmd = 0x55;
                *cmd = 0xa0;
                *dst = b;

                /* Verify write */
                start = get_timer (0);
                while (*dst != b) {
                        if (get_timer (start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
                                ipri (oldpri);
                                return 1;
                        }
                }
                dst++;
                src++;
                cnt--;
                ipri (oldpri);
        }

        return (0);
}