/*
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Alex Zuepke <azu@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>

ulong myflush(void);


#define FLASH_BANK_SIZE 0x400000        /* 4 MB */
#define MAIN_SECT_SIZE  0x20000         /* 128 KB */

flash_info_t    flash_info[CONFIG_SYS_MAX_FLASH_BANKS];


#define CMD_READ_ARRAY          0x00F000F0
#define CMD_UNLOCK1             0x00AA00AA
#define CMD_UNLOCK2             0x00550055
#define CMD_ERASE_SETUP         0x00800080
#define CMD_ERASE_CONFIRM       0x00300030
#define CMD_PROGRAM             0x00A000A0
#define CMD_UNLOCK_BYPASS       0x00200020

#define MEM_FLASH_ADDR1         (*(volatile u32 *)(CONFIG_SYS_FLASH_BASE + (0x00000555 << 2)))
#define MEM_FLASH_ADDR2         (*(volatile u32 *)(CONFIG_SYS_FLASH_BASE + (0x000002AA << 2)))

#define BIT_ERASE_DONE          0x00800080
#define BIT_RDY_MASK            0x00800080
#define BIT_PROGRAM_ERROR       0x00200020
#define BIT_TIMEOUT             0x80000000 /* our flag */

#define READY 1
#define ERR   2
#define TMO   4

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

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 =
          (AMD_MANUFACT & FLASH_VENDMASK) |
          (AMD_ID_LV160B & 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++)
        {

            if (j <= 3)
            {
                /* 1st one is 32 KB */
                if (j == 0)
                {
                        flash_info[i].start[j] = flashbase + 0;
                }

                /* 2nd and 3rd are both 16 KB */
                if ((j == 1) || (j == 2))
                {
                        flash_info[i].start[j] = flashbase + 0x8000 + (j-1)*0x4000;
                }

                /* 4th 64 KB */
                if (j == 3)
                {
                        flash_info[i].start[j] = flashbase + 0x10000;
                }
            }
            else
            {
                flash_info[i].start[j] = flashbase + (j - 3)*MAIN_SECT_SIZE;
            }
        }
        size += flash_info[i].size;
    }

    /*
     * Protect monitor and environment sectors
     * Inferno is complicated, it's hardware locked
     */
#ifdef CONFIG_INFERNO
    /* first one, 0x00000 to 0x07fff */
    flash_protect(FLAG_PROTECT_SET,
                  CONFIG_SYS_FLASH_BASE + 0x00000,
                  CONFIG_SYS_FLASH_BASE + 0x08000 - 1,
                  &flash_info[0]);

    /* third to 10th, 0x0c000 - 0xdffff */
    flash_protect(FLAG_PROTECT_SET,
                  CONFIG_SYS_FLASH_BASE + 0x0c000,
                  CONFIG_SYS_FLASH_BASE + 0xe0000 - 1,
                  &flash_info[0]);
#else
    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]);
#endif
    return size;
}

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

    switch (info->flash_id & FLASH_VENDMASK)
    {
    case (AMD_MANUFACT & FLASH_VENDMASK):
        printf("AMD: ");
        break;
    default:
        printf("Unknown Vendor ");
        break;
    }

    switch (info->flash_id & FLASH_TYPEMASK)
    {
    case (AMD_ID_LV160B & FLASH_TYPEMASK):
        printf("2x Amd29F160BB (16Mbit)\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)
{
    ulong result;
    int iflag, cflag, prot, sect;
    int rc = ERR_OK;
    int chip1, chip2;

    /* first look for protection bits */

    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) !=
        (AMD_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.
     */
    cflag = icache_status();
    icache_disable();
    iflag = 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_long *addr = (vu_long *)(info->start[sect]);

            MEM_FLASH_ADDR1 = CMD_UNLOCK1;
            MEM_FLASH_ADDR2 = CMD_UNLOCK2;
            MEM_FLASH_ADDR1 = CMD_ERASE_SETUP;

            MEM_FLASH_ADDR1 = CMD_UNLOCK1;
            MEM_FLASH_ADDR2 = CMD_UNLOCK2;
            *addr = CMD_ERASE_CONFIRM;

            /* wait until flash is ready */
            chip1 = chip2 = 0;

            do
            {
                result = *addr;

                /* check timeout */
                if (get_timer_masked() > CONFIG_SYS_FLASH_ERASE_TOUT)
                {
                    MEM_FLASH_ADDR1 = CMD_READ_ARRAY;
                    chip1 = TMO;
                    break;
                }

                if (!chip1 && (result & 0xFFFF) & BIT_ERASE_DONE)
                        chip1 = READY;

                if (!chip1 && (result & 0xFFFF) & BIT_PROGRAM_ERROR)
                        chip1 = ERR;

                if (!chip2 && (result >> 16) & BIT_ERASE_DONE)
                        chip2 = READY;

                if (!chip2 && (result >> 16) & BIT_PROGRAM_ERROR)
                        chip2 = ERR;

            }  while (!chip1 || !chip2);

            MEM_FLASH_ADDR1 = CMD_READ_ARRAY;

            if (chip1 == ERR || chip2 == ERR)
            {
                rc = ERR_PROG_ERROR;
                goto outahere;
            }
            if (chip1 == TMO)
            {
                rc = ERR_TIMOUT;
                goto outahere;
            }

            printf("ok.\n");
        }
        else /* it was protected */
        {
            printf("protected!\n");
        }
    }

    if (ctrlc())
      printf("User Interrupt!\n");

outahere:
    /* allow flash to settle - wait 10 ms */
    udelay_masked(10000);

    if (iflag)
      enable_interrupts();

    if (cflag)
      icache_enable();

    return rc;
}

/*-----------------------------------------------------------------------
 * Copy memory to flash
 */

static int write_word (flash_info_t *info, ulong dest, ulong data)
{
    vu_long *addr = (vu_long *)dest;
    ulong result;
    int rc = ERR_OK;
    int cflag, iflag;
    int chip1, chip2;

    /*
     * Check if Flash is (sufficiently) erased
     */
    result = *addr;
    if ((result & 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.
     */
    cflag = icache_status();
    icache_disable();
    iflag = disable_interrupts();

    MEM_FLASH_ADDR1 = CMD_UNLOCK1;
    MEM_FLASH_ADDR2 = CMD_UNLOCK2;
    MEM_FLASH_ADDR1 = CMD_UNLOCK_BYPASS;
    *addr = CMD_PROGRAM;
    *addr = data;

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

    /* wait until flash is ready */
    chip1 = chip2 = 0;
    do
    {
        result = *addr;

        /* check timeout */
        if (get_timer_masked() > CONFIG_SYS_FLASH_ERASE_TOUT)
        {
            chip1 = ERR | TMO;
            break;
        }
        if (!chip1 && ((result & 0x80) == (data & 0x80)))
                chip1 = READY;

        if (!chip1 && ((result & 0xFFFF) & BIT_PROGRAM_ERROR))
        {
                result = *addr;

                if ((result & 0x80) == (data & 0x80))
                        chip1 = READY;
                else
                        chip1 = ERR;
        }

        if (!chip2 && ((result & (0x80 << 16)) == (data & (0x80 << 16))))
                chip2 = READY;

        if (!chip2 && ((result >> 16) & BIT_PROGRAM_ERROR))
        {
                result = *addr;

                if ((result & (0x80 << 16)) == (data & (0x80 << 16)))
                        chip2 = READY;
                else
                        chip2 = ERR;
        }

    }  while (!chip1 || !chip2);

    *addr = CMD_READ_ARRAY;

    if (chip1 == ERR || chip2 == ERR || *addr != data)
        rc = ERR_PROG_ERROR;

    if (iflag)
      enable_interrupts();

    if (cflag)
      icache_enable();

    return rc;
}

/*-----------------------------------------------------------------------
 * Copy memory to flash.
 */

int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
{
    ulong cp, wp, data;
    int l;
    int i, rc;

    wp = (addr & ~3);   /* 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 << 24);
        }
        for (; i<4 && cnt>0; ++i) {
            data = (data >> 8) | (*src++ << 24);
            --cnt;
            ++cp;
        }
        for (; cnt==0 && i<4; ++i, ++cp) {
            data = (data >> 8) | (*(uchar *)cp << 24);
        }

        if ((rc = write_word(info, wp, data)) != 0) {
            return (rc);
        }
        wp += 4;
    }

    /*
     * handle word aligned part
     */
    while (cnt >= 4) {
        data = *((vu_long*)src);
        if ((rc = write_word(info, wp, data)) != 0) {
            return (rc);
        }
        src += 4;
        wp  += 4;
        cnt -= 4;
    }

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

    /*
     * handle unaligned tail bytes
     */
    data = 0;
    for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
        data = (data >> 8) | (*src++ << 24);
        --cnt;
    }
    for (; i<4; ++i, ++cp) {
        data = (data >> 8) | (*(uchar *)cp << 24);
    }

    return write_word(info, wp, data);
}