/*
 * (C) Copyright 2001, 2002
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * Flash Routines for Intel devices
 *
 *--------------------------------------------------------------------
 * 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 <mpc8xx.h>


flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];

/*-----------------------------------------------------------------------
 */
ulong flash_get_size (volatile unsigned long *baseaddr,
                                          flash_info_t * info)
{
        short i;
        unsigned long flashtest_h, flashtest_l;

        info->sector_count = info->size = 0;
        info->flash_id = FLASH_UNKNOWN;

        /* Write query command sequence and test FLASH answer
         */
        baseaddr[0] = 0x00980098;
        baseaddr[1] = 0x00980098;

        flashtest_h = baseaddr[0];      /* manufacturer ID      */
        flashtest_l = baseaddr[1];

        if (flashtest_h != INTEL_MANUFACT || flashtest_l != INTEL_MANUFACT)
                return (0);             /* no or unknown flash  */

        flashtest_h = baseaddr[2];      /* device ID            */
        flashtest_l = baseaddr[3];

        if (flashtest_h != flashtest_l)
                return (0);

        switch (flashtest_h) {
        case INTEL_ID_28F160C3B:
                info->flash_id = FLASH_28F160C3B;
                info->sector_count = 39;
                info->size = 0x00800000;        /* 4 * 2 MB = 8 MB      */
                break;
        case INTEL_ID_28F160F3B:
                info->flash_id = FLASH_28F160F3B;
                info->sector_count = 39;
                info->size = 0x00800000;        /* 4 * 2 MB = 8 MB      */
                break;
        case INTEL_ID_28F640C3B:
                info->flash_id = FLASH_28F640C3B;
                info->sector_count = 135;
                info->size = 0x02000000;        /* 16 * 2 MB = 32 MB    */
                break;
        default:
                return (0);                     /* no or unknown flash  */
        }

        info->flash_id |= INTEL_MANUFACT << 16; /* set manufacturer offset */

        if (info->flash_id & FLASH_BTYPE) {
                volatile unsigned long *tmp = baseaddr;

                /* set up sector start adress table (bottom sector type)
                 * AND unlock the sectors (if our chip is 160C3 or 640C3)
                 */
                for (i = 0; i < info->sector_count; i++) {
                        if (((info->flash_id & FLASH_TYPEMASK) == FLASH_28F160C3B) ||
                            ((info->flash_id & FLASH_TYPEMASK) == FLASH_28F640C3B)) {
                                tmp[0] = 0x00600060;
                                tmp[1] = 0x00600060;
                                tmp[0] = 0x00D000D0;
                                tmp[1] = 0x00D000D0;
                        }
                        info->start[i] = (uint) tmp;
                        tmp += i < 8 ? 0x2000 : 0x10000; /* pointer arith       */
                }
        }

        memset (info->protect, 0, info->sector_count);

        baseaddr[0] = 0x00FF00FF;
        baseaddr[1] = 0x00FF00FF;

        return (info->size);
}

/*-----------------------------------------------------------------------
 */
unsigned long flash_init (void)
{
        unsigned long size_b0 = 0;
        int i;

        /* Init: no FLASHes known
         */
        for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
                flash_info[i].flash_id = FLASH_UNKNOWN;
        }

        /* Static FLASH Bank configuration here (only one bank) */

        size_b0 = flash_get_size ((ulong *) CONFIG_SYS_FLASH0_BASE, &flash_info[0]);
        if (flash_info[0].flash_id == FLASH_UNKNOWN || size_b0 == 0) {
                printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
                                size_b0, size_b0 >> 20);
        }

        /* protect monitor and environment sectors
         */

#ifndef CONFIG_BOOT_ROM
        /* If U-Boot is  booted from ROM the CONFIG_SYS_MONITOR_BASE > CONFIG_SYS_FLASH0_BASE
         * but we shouldn't protect it.
         */

# if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH0_BASE
        flash_protect (FLAG_PROTECT_SET,
                       CONFIG_SYS_MONITOR_BASE,
                       CONFIG_SYS_MONITOR_BASE + monitor_flash_len - 1, &flash_info[0]
        );
# endif
#endif  /* CONFIG_BOOT_ROM */

#if defined(CONFIG_ENV_IS_IN_FLASH) && defined(CONFIG_ENV_ADDR)
# ifndef  CONFIG_ENV_SIZE
#  define CONFIG_ENV_SIZE       CONFIG_ENV_SECT_SIZE
# endif
        flash_protect (FLAG_PROTECT_SET,
                       CONFIG_ENV_ADDR,
                       CONFIG_ENV_ADDR + CONFIG_ENV_SIZE - 1, &flash_info[0]);
#endif

        return (size_b0);
}

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

        if (info->flash_id == FLASH_UNKNOWN) {
                printf ("missing or unknown FLASH type\n");
                return;
        }

        switch ((info->flash_id >> 16) & 0xff) {
        case 0x89:
                printf ("INTEL ");
                break;
        default:
                printf ("Unknown Vendor ");
                break;
        }

        switch (info->flash_id & FLASH_TYPEMASK) {
        case FLASH_28F160C3B:
                printf ("28F160C3B (16 M, bottom sector)\n");
                break;
        case FLASH_28F160F3B:
                printf ("28F160F3B (16 M, bottom sector)\n");
                break;
        case FLASH_28F640C3B:
                printf ("28F640C3B (64 M, bottom sector)\n");
                break;
        default:
                printf ("Unknown Chip Type\n");
                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");
}

/*-----------------------------------------------------------------------
 */
int flash_erase (flash_info_t * info, int s_first, int s_last)
{
        int flag, prot, sect;
        ulong start, now, last;

        if ((s_first < 0) || (s_first > s_last)) {
                if (info->flash_id == FLASH_UNKNOWN) {
                        printf ("- missing\n");
                } else {
                        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");
        }

        /* Start erase on unprotected sectors
         */
        for (sect = s_first; sect <= s_last; sect++) {
                volatile ulong *addr =
                                (volatile unsigned long *) info->start[sect];

                start = get_timer (0);
                last = start;
                if (info->protect[sect] == 0) {
                        /* Disable interrupts which might cause a timeout here
                         */
                        flag = disable_interrupts ();

                        /* Erase the block
                         */
                        addr[0] = 0x00200020;
                        addr[1] = 0x00200020;
                        addr[0] = 0x00D000D0;
                        addr[1] = 0x00D000D0;

                        /* re-enable interrupts if necessary
                         */
                        if (flag)
                                enable_interrupts ();

                        /* wait at least 80us - let's wait 1 ms
                         */
                        udelay (1000);

                        last = start;
                        while ((addr[0] & 0x00800080) != 0x00800080 ||
                                   (addr[1] & 0x00800080) != 0x00800080) {
                                if ((now = get_timer (start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
                                        printf ("Timeout (erase suspended!)\n");
                                        /* Suspend erase
                                         */
                                        addr[0] = 0x00B000B0;
                                        addr[1] = 0x00B000B0;
                                        goto DONE;
                                }
                                /* show that we're waiting
                                 */
                                if ((now - last) > 1000) {      /* every second */
                                        serial_putc ('.');
                                        last = now;
                                }
                        }
                        if (addr[0] & 0x00220022 || addr[1] & 0x00220022) {
                                printf ("*** ERROR: erase failed!\n");
                                goto DONE;
                        }
                }
                /* Clear status register and reset to read mode
                 */
                addr[0] = 0x00500050;
                addr[1] = 0x00500050;
                addr[0] = 0x00FF00FF;
                addr[1] = 0x00FF00FF;
        }

        printf (" done\n");

DONE:
        return 0;
}

static int write_word (flash_info_t *, volatile unsigned long *, ulong);

/*-----------------------------------------------------------------------
 * 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)
{
        ulong v;
        int i, l, cc = cnt, res = 0;


        for (v=0; cc > 0; addr += 4, cc -= 4 - l) {
                l = (addr & 3);
                addr &= ~3;

                for (i = 0; i < 4; i++) {
                        v = (v << 8) + (i < l || i - l >= cc ?
                                *((unsigned char *) addr + i) : *src++);
                }

                if ((res = write_word (info, (volatile unsigned long *) addr, v)) != 0)
                        break;
        }

        return (res);
}

/*-----------------------------------------------------------------------
 * Write a word to Flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 */
static int write_word (flash_info_t * info, volatile unsigned long *addr,
                                           ulong data)
{
        int flag, res = 0;
        ulong start;

        /* Check if Flash is (sufficiently) erased
         */
        if ((*addr & data) != data)
                return (2);

        /* Disable interrupts which might cause a timeout here
         */
        flag = disable_interrupts ();

        *addr = 0x00400040;
        *addr = data;

        /* re-enable interrupts if necessary
         */
        if (flag)
                enable_interrupts ();

        start = get_timer (0);
        while ((*addr & 0x00800080) != 0x00800080) {
                if (get_timer (start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
                        /* Suspend program
                         */
                        *addr = 0x00B000B0;
                        res = 1;
                        goto OUT;
                }
        }

        if (*addr & 0x00220022) {
                printf ("*** ERROR: program failed!\n");
                res = 1;
        }

OUT:
        /* Clear status register and reset to read mode
         */
        *addr = 0x00500050;
        *addr = 0x00FF00FF;

        return (res);
}