/*
 * (C) Copyright 2003
 * 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 <asm/inca-ip.h>

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

typedef unsigned long FLASH_PORT_WIDTH;
typedef volatile unsigned long FLASH_PORT_WIDTHV;

#define FLASH_ID_MASK   0xFFFFFFFF

#define FPW     FLASH_PORT_WIDTH
#define FPWV    FLASH_PORT_WIDTHV

#define ORMASK(size) ((-size) & OR_AM_MSK)

#define FLASH29_REG_ADRS(reg) ((FPWV *)PHYS_FLASH_1 + (reg))

/* FLASH29 command register addresses */

#define FLASH29_REG_FIRST_CYCLE         FLASH29_REG_ADRS (0x1555)
#define FLASH29_REG_SECOND_CYCLE        FLASH29_REG_ADRS (0x2aaa)
#define FLASH29_REG_THIRD_CYCLE         FLASH29_REG_ADRS (0x3555)
#define FLASH29_REG_FOURTH_CYCLE        FLASH29_REG_ADRS (0x4555)
#define FLASH29_REG_FIFTH_CYCLE         FLASH29_REG_ADRS (0x5aaa)
#define FLASH29_REG_SIXTH_CYCLE         FLASH29_REG_ADRS (0x6555)

/* FLASH29 command definitions */

#define FLASH29_CMD_FIRST               0xaaaaaaaa
#define FLASH29_CMD_SECOND              0x55555555
#define FLASH29_CMD_FOURTH              0xaaaaaaaa
#define FLASH29_CMD_FIFTH               0x55555555
#define FLASH29_CMD_SIXTH               0x10101010

#define FLASH29_CMD_SECTOR              0x30303030
#define FLASH29_CMD_PROGRAM             0xa0a0a0a0
#define FLASH29_CMD_CHIP_ERASE          0x80808080
#define FLASH29_CMD_READ_RESET          0xf0f0f0f0
#define FLASH29_CMD_AUTOSELECT          0x90909090
#define FLASH29_CMD_READ                0x70707070

#define IN_RAM_CMD_READ         0x1
#define IN_RAM_CMD_WRITE        0x2

#define FLASH_WRITE_CMD ((ulong)(flash_write_cmd) & 0x7)+0xbf008000
#define FLASH_READ_CMD  ((ulong)(flash_read_cmd) & 0x7)+0xbf008000

typedef void (*FUNCPTR_CP)(ulong *source, ulong *destination, ulong nlongs);
typedef void (*FUNCPTR_RD)(int cmd, FPWV * pFA, char * string, int strLen);
typedef void (*FUNCPTR_WR)(int cmd, FPWV * pFA, FPW value);

static ulong flash_get_size(FPWV *addr, flash_info_t *info);
static int write_word(flash_info_t *info, FPWV *dest, FPW data);
static void flash_get_offsets(ulong base, flash_info_t *info);
static flash_info_t *flash_get_info(ulong base);

static void load_cmd(ulong cmd);
static ulong in_ram_cmd = 0;


/******************************************************************************
*
* Don't change the program architecture
* This architecture assure the program
* can be relocated to scratch ram
*/
static void flash_read_cmd(int cmd, FPWV * pFA, char * string, int strLen)
{
        int i,j;
        FPW temp,temp1;
        FPWV *str;

        str = (FPWV *)string;

        j=  strLen/4;

        if(cmd == FLASH29_CMD_AUTOSELECT)
           {
            *(FLASH29_REG_FIRST_CYCLE)  = FLASH29_CMD_FIRST;
            *(FLASH29_REG_SECOND_CYCLE) = FLASH29_CMD_SECOND;
            *(FLASH29_REG_THIRD_CYCLE)  = FLASH29_CMD_AUTOSELECT;
           }

        if(cmd == FLASH29_CMD_READ)
           {
            i = 0;
            while(i<j)
            {
                temp = *pFA++;
                temp1 = *(int *)0xa0000000;
                *(int *)0xbf0081f8 = temp1 + temp;
                *str++ = temp;
                i++;
            }
           }

         if(cmd == FLASH29_CMD_READ_RESET)
         {
            *(FLASH29_REG_FIRST_CYCLE)  = FLASH29_CMD_FIRST;
            *(FLASH29_REG_SECOND_CYCLE) = FLASH29_CMD_SECOND;
            *(FLASH29_REG_THIRD_CYCLE)  = FLASH29_CMD_READ_RESET;
         }

        *(int *)0xbf0081f8 = *(int *)0xa0000000;        /* dummy read switch back to sdram interface */
}

/******************************************************************************
*
* Don't change the program architecture
* This architecture assure the program
* can be relocated to scratch ram
*/
static void flash_write_cmd(int cmd, FPWV * pFA, FPW value)
{
        *(FLASH29_REG_FIRST_CYCLE)  = FLASH29_CMD_FIRST;
        *(FLASH29_REG_SECOND_CYCLE) = FLASH29_CMD_SECOND;

        if (cmd == FLASH29_CMD_SECTOR)
           {
            *(FLASH29_REG_THIRD_CYCLE)  = FLASH29_CMD_CHIP_ERASE;
            *(FLASH29_REG_FOURTH_CYCLE) = FLASH29_CMD_FOURTH;
            *(FLASH29_REG_FIFTH_CYCLE)  = FLASH29_CMD_FIFTH;
            *pFA                        = FLASH29_CMD_SECTOR;
           }

        if (cmd == FLASH29_CMD_SIXTH)
           {
            *(FLASH29_REG_THIRD_CYCLE)  = FLASH29_CMD_CHIP_ERASE;
            *(FLASH29_REG_FOURTH_CYCLE) = FLASH29_CMD_FOURTH;
            *(FLASH29_REG_FIFTH_CYCLE)  = FLASH29_CMD_FIFTH;
            *(FLASH29_REG_SIXTH_CYCLE)  = FLASH29_CMD_SIXTH;
           }

        if (cmd == FLASH29_CMD_PROGRAM)
           {
            *(FLASH29_REG_THIRD_CYCLE)  = FLASH29_CMD_PROGRAM;
            *pFA = value;
           }

        if (cmd == FLASH29_CMD_READ_RESET)
           {
            *(FLASH29_REG_THIRD_CYCLE)  = FLASH29_CMD_READ_RESET;
           }

        *(int *)0xbf0081f8 = *(int *)0xa0000000;        /* dummy read switch back to sdram interface */
}

static void load_cmd(ulong cmd)
{
        ulong *src;
        ulong *dst;
        FUNCPTR_CP absEntry;
        ulong func;

        if (in_ram_cmd & cmd) return;

        if (cmd == IN_RAM_CMD_READ)
        {
                func = (ulong)flash_read_cmd;
        }
        else
        {
                func = (ulong)flash_write_cmd;
        }

        src = (ulong *)(func & 0xfffffff8);
        dst = (ulong *)0xbf008000;
        absEntry = (FUNCPTR_CP)(0xbf0081d0);
        absEntry(src,dst,0x38);

        in_ram_cmd = cmd;
}

/*-----------------------------------------------------------------------
 * flash_init()
 *
 * sets up flash_info and returns size of FLASH (bytes)
 */
unsigned long flash_init (void)
{
        unsigned long size = 0;
        int i;

        load_cmd(IN_RAM_CMD_READ);

        /* Init: no FLASHes known */
        for (i=0; i < CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
                ulong flashbase = PHYS_FLASH_1;
                ulong * buscon = (ulong *) INCA_IP_EBU_EBU_BUSCON0;

                /* Disable write protection */
                *buscon &= ~INCA_IP_EBU_EBU_BUSCON1_WRDIS;

#if 1
                memset(&flash_info[i], 0, sizeof(flash_info_t));
#endif

                flash_info[i].size =
                        flash_get_size((FPW *)flashbase, &flash_info[i]);

                if (flash_info[i].flash_id == FLASH_UNKNOWN) {
                        printf ("## Unknown FLASH on Bank %d - Size = 0x%08lx\n",
                        i, flash_info[i].size);
                }

                size += flash_info[i].size;
        }

#if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
        /* monitor protection ON by default */
        flash_protect(FLAG_PROTECT_SET,
                      CONFIG_SYS_MONITOR_BASE,
                      CONFIG_SYS_MONITOR_BASE+monitor_flash_len-1,
                      flash_get_info(CONFIG_SYS_MONITOR_BASE));
#endif

#ifdef  CONFIG_ENV_IS_IN_FLASH
        /* ENV protection ON by default */
        flash_protect(FLAG_PROTECT_SET,
                      CONFIG_ENV_ADDR,
                      CONFIG_ENV_ADDR+CONFIG_ENV_SIZE-1,
                      flash_get_info(CONFIG_ENV_ADDR));
#endif

        return size;
}

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

        if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_AMD
                 && (info->flash_id & FLASH_TYPEMASK) == FLASH_AM160B) {

                int bootsect_size[4];   /* number of bytes/boot sector  */
                int sect_size;          /* number of bytes/regular sector */

                bootsect_size[0] = 0x00008000;
                bootsect_size[1] = 0x00004000;
                bootsect_size[2] = 0x00004000;
                bootsect_size[3] = 0x00010000;
                sect_size =        0x00020000;

                /* set sector offsets for bottom boot block type        */
                for (i = 0; i < info->sector_count; i++) {
                        info->start[i] = base;
                        base += i < 4 ? bootsect_size[i] : sect_size;
                }
        }
}

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

static flash_info_t *flash_get_info(ulong base)
{
        int i;
        flash_info_t * info;

        for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i ++) {
                info = & flash_info[i];
                if (info->start[0] <= base && base < info->start[0] + info->size)
                        break;
        }

        return i == CONFIG_SYS_MAX_FLASH_BANKS ? 0 : info;
}

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

void flash_print_info (flash_info_t *info)
{
        int i;
        uchar *boottype;
        uchar *bootletter;
        char *fmt;
        uchar botbootletter[] = "B";
        uchar topbootletter[] = "T";
        uchar botboottype[] = "bottom boot sector";
        uchar topboottype[] = "top boot sector";

        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_BM:      printf ("BRIGHT MICRO ");       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;
        default:                printf ("Unknown Vendor ");     break;
        }

        /* check for top or bottom boot, if it applies */
        if (info->flash_id & FLASH_BTYPE) {
                boottype = botboottype;
                bootletter = botbootletter;
        }
        else {
                boottype = topboottype;
                bootletter = topbootletter;
        }

        switch (info->flash_id & FLASH_TYPEMASK) {
        case FLASH_AM160B:
                fmt = "29LV160B%s (16 Mbit, %s)\n";
                break;
        case FLASH_28F800C3B:
        case FLASH_28F800C3T:
                fmt = "28F800C3%s (8 Mbit, %s)\n";
                break;
        case FLASH_INTEL800B:
        case FLASH_INTEL800T:
                fmt = "28F800B3%s (8 Mbit, %s)\n";
                break;
        case FLASH_28F160C3B:
        case FLASH_28F160C3T:
                fmt = "28F160C3%s (16 Mbit, %s)\n";
                break;
        case FLASH_INTEL160B:
        case FLASH_INTEL160T:
                fmt = "28F160B3%s (16 Mbit, %s)\n";
                break;
        case FLASH_28F320C3B:
        case FLASH_28F320C3T:
                fmt = "28F320C3%s (32 Mbit, %s)\n";
                break;
        case FLASH_INTEL320B:
        case FLASH_INTEL320T:
                fmt = "28F320B3%s (32 Mbit, %s)\n";
                break;
        case FLASH_28F640C3B:
        case FLASH_28F640C3T:
                fmt = "28F640C3%s (64 Mbit, %s)\n";
                break;
        case FLASH_INTEL640B:
        case FLASH_INTEL640T:
                fmt = "28F640B3%s (64 Mbit, %s)\n";
                break;
        default:
                fmt = "Unknown Chip Type\n";
                break;
        }

        printf (fmt, bootletter, boottype);

        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");
}

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

/*
 * The following code cannot be run from FLASH!
 */

ulong flash_get_size (FPWV *addr, flash_info_t *info)
{
        FUNCPTR_RD absEntry;
        FPW retValue;
        int flag;

        load_cmd(IN_RAM_CMD_READ);
        absEntry = (FUNCPTR_RD)FLASH_READ_CMD;

        flag = disable_interrupts();
        absEntry(FLASH29_CMD_AUTOSELECT,0,0,0);
        if (flag) enable_interrupts();

        udelay(100);

        flag = disable_interrupts();
        absEntry(FLASH29_CMD_READ, addr + 1, (char *)&retValue, sizeof(retValue));
        absEntry(FLASH29_CMD_READ_RESET,0,0,0);
        if (flag) enable_interrupts();

        udelay(100);

        switch (retValue) {

        case (FPW)AMD_ID_LV160B:
                info->flash_id += FLASH_AM160B;
                info->sector_count = 35;
                info->size = 0x00400000;
                break;                          /* => 8 or 16 MB        */

        default:
                info->flash_id = FLASH_UNKNOWN;
                info->sector_count = 0;
                info->size = 0;
                return (0);                     /* => no or unknown flash */
        }

        flash_get_offsets((ulong)addr, info);

        return (info->size);
}

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

int     flash_erase (flash_info_t *info, int s_first, int s_last)
{
        FPWV *addr;
        int flag, prot, sect;
        ulong start, now, last;
        FUNCPTR_WR absEntry;

        load_cmd(IN_RAM_CMD_WRITE);
        absEntry = (FUNCPTR_WR)FLASH_WRITE_CMD;

        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;
        }

        switch (info->flash_id & FLASH_TYPEMASK) {
        case FLASH_AM160B:
                break;
        case FLASH_UNKNOWN:
        default:
                printf ("Can't erase unknown flash type %08lx - aborted\n",
                        info->flash_id);
                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");
        }

        last  = get_timer(0);

        /* Start erase on unprotected sectors */
        for (sect = s_first; sect<=s_last; sect++) {

                if (info->protect[sect] != 0)   /* protected, skip it */
                        continue;

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

                addr = (FPWV *)(info->start[sect]);
                absEntry(FLASH29_CMD_SECTOR, addr, 0);

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

                start = get_timer(0);

                while ((now = get_timer(start)) <= CONFIG_SYS_FLASH_ERASE_TOUT) {

                        /* show that we're waiting */
                        if ((get_timer(last)) > CONFIG_SYS_HZ) {/* every second */
                                putc ('.');
                                last = get_timer(0);
                        }
                }

                flag = disable_interrupts();
                absEntry(FLASH29_CMD_READ_RESET,0,0);
                if (flag)
                        enable_interrupts();
        }

        printf (" done\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)
{
    FPW data = 0; /* 16 or 32 bit word, matches flash bus width on MPC8XX */
    int bytes;    /* number of bytes to program in current word         */
    int left;     /* number of bytes left to program                    */
    int i, res;

    for (left = cnt, res = 0;
         left > 0 && res == 0;
         addr += sizeof(data), left -= sizeof(data) - bytes) {

        bytes = addr & (sizeof(data) - 1);
        addr &= ~(sizeof(data) - 1);

        /* combine source and destination data so can program
         * an entire word of 16 or 32 bits
         */
        for (i = 0; i < sizeof(data); i++) {
            data <<= 8;
            if (i < bytes || i - bytes >= left )
                data += *((uchar *)addr + i);
            else
                data += *src++;
        }

        res = write_word(info, (FPWV *)addr, data);
    }

    return (res);
}

static int write_word (flash_info_t *info, FPWV *dest, FPW data)
{
    int res = 0;        /* result, assume success       */
    FUNCPTR_WR absEntry;
    int flag;

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

    if (info->start[0] != PHYS_FLASH_1)
    {
        return (3);
    }

    load_cmd(IN_RAM_CMD_WRITE);
    absEntry = (FUNCPTR_WR)FLASH_WRITE_CMD;

    flag = disable_interrupts();
    absEntry(FLASH29_CMD_PROGRAM,dest,data);
    if (flag) enable_interrupts();

    udelay(100);

    flag = disable_interrupts();
    absEntry(FLASH29_CMD_READ_RESET,0,0);
    if (flag) enable_interrupts();

    return (res);
}