/*
 * (C) Copyright 2001
 * 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 <mpc824x.h>

#if defined(CONFIG_ENV_IS_IN_FLASH)
# ifndef  CONFIG_ENV_ADDR
#  define CONFIG_ENV_ADDR  (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
# endif
# ifndef  CONFIG_ENV_SIZE
#  define CONFIG_ENV_SIZE  CONFIG_ENV_SECT_SIZE
# endif
# ifndef  CONFIG_ENV_SECT_SIZE
#  define CONFIG_ENV_SECT_SIZE  CONFIG_ENV_SIZE
# endif
#endif


/*---------------------------------------------------------------------*/
#define DEBUG_FLASH

#ifdef DEBUG_FLASH
#define DEBUGF(fmt,args...) printf(fmt ,##args)
#else
#define DEBUGF(fmt,args...)
#endif
/*---------------------------------------------------------------------*/

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

/*-----------------------------------------------------------------------
 * Functions
 */
static ulong flash_get_size (vu_char *addr, flash_info_t *info);
static int write_data (flash_info_t *info, uchar *dest, uchar data);
static void flash_get_offsets (ulong base, flash_info_t *info);

#define BS(b)     (b)
#define BYTEME(x) ((x) & 0xFF)

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

unsigned long flash_init (void)
{
        unsigned long flash_banks[CONFIG_SYS_MAX_FLASH_BANKS] = CONFIG_SYS_FLASH_BANKS;
        unsigned long size, size_b[CONFIG_SYS_MAX_FLASH_BANKS];

        int i;

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

                DEBUGF("Get flash bank %d @ 0x%08lx\n", i, flash_banks[i]);
/*
                size_b[i] = flash_get_size((vu_char *)flash_banks[i], &flash_info[i]);
*/
                size_b[i] = flash_get_size((vu_char *) 0xff800000 , &flash_info[i]);

                if (flash_info[i].flash_id == FLASH_UNKNOWN)
                {
                        printf ("## Unknown FLASH on Bank %d: "
                                "ID 0x%lx, Size = 0x%08lx = %ld MB\n",
                                i, flash_info[i].flash_id,
                                size_b[i], size_b[i]<<20);
                }
                else
                {
                        DEBUGF("## Flash bank %d at 0x%08lx sizes: 0x%08lx \n",
                                i, flash_banks[i], size_b[i]);

                        flash_get_offsets (flash_banks[i], &flash_info[i]);
                        flash_info[i].size = size_b[i];
                }
        }


#if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
        DEBUGF("protect monitor %x @ %x\n", CONFIG_SYS_MONITOR_BASE, CONFIG_SYS_MONITOR_LEN);
        /* monitor protection ON by default */
        flash_protect(FLAG_PROTECT_SET,
                      CONFIG_SYS_MONITOR_BASE,
                      CONFIG_SYS_MONITOR_BASE+CONFIG_SYS_MONITOR_LEN-1,
                      &flash_info[0]);
#endif

#ifdef  CONFIG_ENV_IS_IN_FLASH
        /* ENV protection ON by default */
        DEBUGF("protect environtment %x @ %x\n", CONFIG_ENV_ADDR, CONFIG_ENV_SECT_SIZE);
        flash_protect(FLAG_PROTECT_SET,
                      CONFIG_ENV_ADDR,
                      CONFIG_ENV_ADDR+CONFIG_ENV_SECT_SIZE-1,
                      &flash_info[0]);
#endif

        size = 0;
        DEBUGF("## Final Flash bank sizes: ");
        for (i=0; i<CONFIG_SYS_MAX_FLASH_BANKS; ++i)
        {
                DEBUGF("%08lx ", size_b[i]);
                size += size_b[i];
        }
        DEBUGF("\n");
        return (size);
}

/*-----------------------------------------------------------------------
 */
static void flash_get_offsets (ulong base, flash_info_t *info)
{
        int i;

        if (info->flash_id == FLASH_UNKNOWN) {
                return;
        }

        switch (info->flash_id & FLASH_VENDMASK) {
                case FLASH_MAN_INTEL:
                    for (i = 0; i < info->sector_count; i++) {
                                info->start[i] = base;
                                base += 0x00020000;             /* 128k per bank */
                    }
                    return;

                default:
                    printf ("Don't know sector ofsets for flash type 0x%lx\n", info->flash_id);
                    return;
        }
}

/*-----------------------------------------------------------------------
 */
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 & FLASH_VENDMASK) {
        case FLASH_MAN_AMD:     printf ("AMD ");                break;
        case FLASH_MAN_FUJ:     printf ("Fujitsu ");            break;
        case FLASH_MAN_SST:     printf ("SST ");                break;
        case FLASH_MAN_STM:     printf ("STM ");                break;
        case FLASH_MAN_INTEL:   printf ("Intel ");              break;
        case FLASH_MAN_MT:      printf ("MT ");                 break;
        default:                printf ("Unknown Vendor ");     break;
        }

        switch (info->flash_id & FLASH_TYPEMASK) {
        case FLASH_28F320J3A:
                        printf ("28F320J3A (32Mbit = 128K x 32)\n");
                        break;
        case FLASH_28F640J3A:
                        printf ("28F640J3A (64Mbit = 128K x 64)\n");
                        break;
        case FLASH_28F128J3A:
                        printf ("28F128J3A (128Mbit = 128K x 128)\n");
                        break;
        default:
                        printf ("Unknown Chip Type\n");
                        break;
        }

#if 1
        if (info->size >= (1 << 20)) {
                i = 20;
        } else {
                i = 10;
        }
        printf ("  Size: %ld %cB in %d Sectors\n",
                info->size >> i,
                (i == 20) ? 'M' : 'k',
                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");
#endif
        return;
}

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


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

/*
 * The following code cannot be run from FLASH!
 */
static ulong flash_get_size (vu_char *addr, flash_info_t *info)
{
        vu_char manuf, device;

        addr[0] = BS(0x90);
        manuf = BS(addr[0]);
        DEBUGF("Manuf. ID @ 0x%08lx: 0x%08x\n", (ulong)addr, manuf);

        switch (manuf) {
        case BYTEME(AMD_MANUFACT):
                info->flash_id = FLASH_MAN_AMD;
                break;
        case BYTEME(FUJ_MANUFACT):
                info->flash_id = FLASH_MAN_FUJ;
                break;
        case BYTEME(SST_MANUFACT):
                info->flash_id = FLASH_MAN_SST;
                break;
        case BYTEME(STM_MANUFACT):
                info->flash_id = FLASH_MAN_STM;
                break;
        case BYTEME(INTEL_MANUFACT):
                info->flash_id = FLASH_MAN_INTEL;
                break;
        default:
                info->flash_id = FLASH_UNKNOWN;
                info->sector_count = 0;
                info->size = 0;
                addr[0] = BS(0xFF);             /* restore read mode, (yes, BS is a NOP) */
                return 0;                       /* no or unknown flash  */
        }

        device = BS(addr[2]);                   /* device ID            */

        DEBUGF("Device ID @ 0x%08lx: 0x%08x\n", (ulong)(&addr[1]), device);

        switch (device) {
        case BYTEME(INTEL_ID_28F320J3A):
                info->flash_id += FLASH_28F320J3A;
                info->sector_count = 32;
                info->size = 0x00400000;
                break;                          /* =>  4 MB             */

        case BYTEME(INTEL_ID_28F640J3A):
                info->flash_id += FLASH_28F640J3A;
                info->sector_count = 64;
                info->size = 0x00800000;
                break;                          /* => 8 MB              */

        case BYTEME(INTEL_ID_28F128J3A):
                info->flash_id += FLASH_28F128J3A;
                info->sector_count = 128;
                info->size = 0x01000000;
                break;                          /* => 16 MB             */

        default:
                info->flash_id = FLASH_UNKNOWN;
                addr[0] = BS(0xFF);             /* restore read mode (yes, a NOP) */
                return 0;                       /* => no or unknown flash */

        }

        if (info->sector_count > CONFIG_SYS_MAX_FLASH_SECT) {
                printf ("** ERROR: sector count %d > max (%d) **\n",
                        info->sector_count, CONFIG_SYS_MAX_FLASH_SECT);
                info->sector_count = CONFIG_SYS_MAX_FLASH_SECT;
        }

        addr[0] = BS(0xFF);             /* restore read mode */

        return (info->size);
}


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

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;
        }

        if ((info->flash_id & FLASH_VENDMASK) != FLASH_MAN_INTEL) {
                printf ("Can erase only Intel flash types - aborted\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 = get_timer (0);
        last  = start;
        /* Start erase on unprotected sectors */
        for (sect = s_first; sect<=s_last; sect++) {
                if (info->protect[sect] == 0) { /* not protected */
                        vu_char *addr = (vu_char *)(info->start[sect]);
                        unsigned long status;

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

                        *addr = BS(0x50);       /* clear status register */
                        *addr = BS(0x20);       /* erase setup */
                        *addr = BS(0xD0);       /* erase confirm */

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

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

                        while (((status = BS(*addr)) & BYTEME(0x00800080)) != BYTEME(0x00800080)) {
                                if ((now=get_timer(start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
                                        printf ("Timeout\n");
                                        *addr = BS(0xB0); /* suspend erase        */
                                        *addr = BS(0xFF); /* reset to read mode */
                                        return 1;
                                }

                                /* show that we're waiting */
                                if ((now - last) > 1000) {      /* every second */
                                        putc ('.');
                                        last = now;
                                }
                        }

                        *addr = BS(0xFF);       /* reset to read mode */
                }
        }
        printf (" done\n");
        return 0;
}

/*-----------------------------------------------------------------------
 * Copy memory to flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 * 4 - Flash not identified
 */

#define FLASH_WIDTH     1       /* flash bus width in bytes */

int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
{
        uchar *wp = (uchar *)addr;
        int rc;

        if (info->flash_id == FLASH_UNKNOWN) {
                return 4;
        }

        while (cnt > 0) {
                if ((rc = write_data(info, wp, *src)) != 0) {
                        return rc;
                }
                wp++;
                src++;
                cnt--;
        }

        return cnt;
}

/*-----------------------------------------------------------------------
 * Write a word to Flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 */
static int write_data (flash_info_t *info, uchar *dest, uchar data)
{
        vu_char *addr = (vu_char *)dest;
        ulong status;
        ulong start;
        int flag;

        /* Check if Flash is (sufficiently) erased */
        if ((BS(*addr) & data) != data) {
                return 2;
        }
        /* Disable interrupts which might cause a timeout here */
        flag = disable_interrupts();

        *addr = BS(0x40);               /* write setup */
        *addr = data;

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

        start = get_timer (0);

        while (((status = BS(*addr)) & BYTEME(0x00800080)) != BYTEME(0x00800080)) {
                if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
                        *addr = BS(0xFF);       /* restore read mode */
                        return 1;
                }
        }

        *addr = BS(0xFF);       /* restore read mode */

        return 0;
}

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