/*
 * (C) Copyright 2000-2003
 * 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>

#define PHYS_FLASH_1 CONFIG_SYS_FLASH_BASE
#define FLASH_BANK_SIZE 0x200000

flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];

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_PL160CB & FLASH_TYPEMASK):
                printf ("AM29PL160CB (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:
        return;
}


unsigned long 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_PL160CB & 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 to many flash banks!\n");

                for (j = 0; j < flash_info[i].sector_count; j++) {
                        if (j == 0) {
                                /* 1st is 16 KiB */
                                flash_info[i].start[j] = flashbase;
                        }
                        if ((j >= 1) && (j <= 2)) {
                                /* 2nd and 3rd are 8 KiB */
                                flash_info[i].start[j] =
                                        flashbase + 0x4000 + 0x2000 * (j - 1);
                        }
                        if (j == 3) {
                                /* 4th is 224 KiB */
                                flash_info[i].start[j] = flashbase + 0x8000;
                        }
                        if ((j >= 4) && (j <= 10)) {
                                /* rest is 256 KiB */
                                flash_info[i].start[j] =
                                        flashbase + 0x40000 + 0x40000 * (j -
                                                                         4);
                        }
                }
                size += flash_info[i].size;
        }

        flash_protect (FLAG_PROTECT_SET,
                       CONFIG_SYS_FLASH_BASE,
                       CONFIG_SYS_FLASH_BASE + 0x3ffff, &flash_info[0]);

        return size;
}


#define CMD_READ_ARRAY          0x00F0
#define CMD_UNLOCK1             0x00AA
#define CMD_UNLOCK2             0x0055
#define CMD_ERASE_SETUP         0x0080
#define CMD_ERASE_CONFIRM       0x0030
#define CMD_PROGRAM             0x00A0
#define CMD_UNLOCK_BYPASS       0x0020

#define MEM_FLASH_ADDR1         (*(volatile u16 *)(CONFIG_SYS_FLASH_BASE + (0x00000555<<1)))
#define MEM_FLASH_ADDR2         (*(volatile u16 *)(CONFIG_SYS_FLASH_BASE + (0x000002AA<<1)))

#define BIT_ERASE_DONE          0x0080
#define BIT_RDY_MASK            0x0080
#define BIT_PROGRAM_ERROR       0x0020
#define BIT_TIMEOUT             0x80000000      /* our flag */

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


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;
        ulong start;

        /* 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 ();

        printf ("\n");

        /* 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 */
                start = get_timer(0);

                if (info->protect[sect] == 0) { /* not protected */
                        volatile u16 *addr =
                                (volatile u16 *) (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 = 0;

                        do {
                                result = *addr;

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

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

                        } while (!chip1);

                        MEM_FLASH_ADDR1 = CMD_READ_ARRAY;

                        if (chip1 == 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 (10000);

        if (iflag)
                enable_interrupts ();

        if (cflag)
                icache_enable ();

        return rc;
}

static int write_word (flash_info_t * info, ulong dest, ulong data)
{
        volatile u16 *addr = (volatile u16 *) dest;
        ulong result;
        int rc = ERR_OK;
        int cflag, iflag;
        int chip1;
        ulong start;

        /*
         * 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_PROGRAM;
        *addr = data;

        /* arm simple, non interrupt dependent timer */
        start = get_timer(0);

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

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

        } while (!chip1);

        *addr = CMD_READ_ARRAY;

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

        if (iflag)
                enable_interrupts ();

        if (cflag)
                icache_enable ();

        return rc;
}


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

        if (addr & 1) {
                printf ("unaligned destination not supported\n");
                return ERR_ALIGN;
        }

#if 0
        if (cnt & 1) {
                printf ("odd transfer sizes not supported\n");
                return ERR_ALIGN;
        }
#endif

        wp = addr;

        if (addr & 1) {
                data = (*((volatile u8 *) addr) << 8) | *((volatile u8 *)
                                                          src);
                if ((rc = write_word (info, wp - 1, data)) != 0) {
                        return (rc);
                }
                src += 1;
                wp += 1;
                cnt -= 1;
        }

        while (cnt >= 2) {
                data = *((volatile u16 *) src);
                if ((rc = write_word (info, wp, data)) != 0) {
                        return (rc);
                }
                src += 2;
                wp += 2;
                cnt -= 2;
        }

        if (cnt == 1) {
                data = (*((volatile u8 *) src) << 8) |
                        *((volatile u8 *) (wp + 1));
                if ((rc = write_word (info, wp, data)) != 0) {
                        return (rc);
                }
                src += 1;
                wp += 1;
                cnt -= 1;
        }

        return ERR_OK;
}