/*
 * (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>
#if defined(CONFIG_NIOS)
#include <nios.h>
#else
#include <asm/io.h>
#endif

#define SECTSZ          (64 * 1024)
flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];

/*----------------------------------------------------------------------*/
unsigned long flash_init (void)
{
        int i;
        unsigned long addr;
        flash_info_t *fli = &flash_info[0];

        fli->size = CONFIG_SYS_FLASH_SIZE;
        fli->sector_count = CONFIG_SYS_MAX_FLASH_SECT;
        fli->flash_id = FLASH_MAN_AMD + FLASH_AMDLV065D;

        addr = CONFIG_SYS_FLASH_BASE;
        for (i = 0; i < fli->sector_count; ++i) {
                fli->start[i] = addr;
                addr += SECTSZ;
                fli->protect[i] = 1;
        }

        return (CONFIG_SYS_FLASH_SIZE);
}
/*--------------------------------------------------------------------*/
void flash_print_info (flash_info_t * info)
{
        int i, k;
        int erased;
        unsigned long *addr;

        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 */
                erased = 1;
                addr = (unsigned long *) info->start[i];
                for (k = 0; k < SECTSZ/sizeof(unsigned long); k++) {
                        if ( readl(addr++) != (unsigned long)-1) {
                                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)
{
        unsigned char *addr = (unsigned char *) info->start[0];
        unsigned char *addr2;
        int prot, sect;
        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");
        }

        /* 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 = (unsigned char *) info->start[sect];
                        writeb (0xaa, addr);
                        writeb (0x55, addr);
                        writeb (0x80, addr);
                        writeb (0xaa, addr);
                        writeb (0x55, addr);
                        writeb (0x30, addr2);
                        /* Now just wait for 0xff & provide some user
                         * feedback while we wait.
                         */
                        start = get_timer (0);
                        while ( readb (addr2) != 0xff) {
                                udelay (1000 * 1000);
                                putc ('.');
                                if (get_timer (start) > CONFIG_SYS_FLASH_ERASE_TOUT) {
                                        printf ("timeout\n");
                                        return 1;
                                }
                        }
                }
        }
        printf ("\n");
        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;
        ulong start;

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

                writeb (0xaa, cmd);
                writeb (0x55, cmd);
                writeb (0xa0, cmd);
                writeb (b, dst);

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

        return (0);
}