/*
 * (C) Copyright 2000
 * 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
 *
 * Hacked for the Hymod board by Murray.Jensen@cmst.csiro.au, 20-Oct-00
 */

#include <common.h>
#include <mpc8xx.h>
#include <galileo/gt64260R.h>
#include <galileo/memory.h>
#include "intel_flash.h"


/*-----------------------------------------------------------------------
 * Protection Flags:
 */
#define FLAG_PROTECT_SET        0x01
#define FLAG_PROTECT_CLEAR      0x02

static void
bank_reset(flash_info_t *info, int sect)
{
        bank_addr_t addrw, eaddrw;

        addrw = (bank_addr_t)info->start[sect];
        eaddrw = BANK_ADDR_NEXT_WORD(addrw);

        while (addrw < eaddrw) {
#ifdef FLASH_DEBUG
                printf("  writing reset cmd to addr 0x%08lx\n",
                        (unsigned long)addrw);
#endif
                *addrw = BANK_CMD_RST;
                addrw++;
        }
}

static void
bank_erase_init(flash_info_t *info, int sect)
{
        bank_addr_t addrw, saddrw, eaddrw;
        int flag;

#ifdef FLASH_DEBUG
        printf("0x%08x BANK_CMD_PROG\n", BANK_CMD_PROG);
        printf("0x%08x BANK_CMD_ERASE1\n", BANK_CMD_ERASE1);
        printf("0x%08x BANK_CMD_ERASE2\n", BANK_CMD_ERASE2);
        printf("0x%08x BANK_CMD_CLR_STAT\n", BANK_CMD_CLR_STAT);
        printf("0x%08x BANK_CMD_RST\n", BANK_CMD_RST);
        printf("0x%08x BANK_STAT_RDY\n", BANK_STAT_RDY);
        printf("0x%08x BANK_STAT_ERR\n", BANK_STAT_ERR);
#endif

        saddrw = (bank_addr_t)info->start[sect];
        eaddrw = BANK_ADDR_NEXT_WORD(saddrw);

#ifdef FLASH_DEBUG
        printf("erasing sector %d, start addr = 0x%08lx "
                "(bank next word addr = 0x%08lx)\n", sect,
                (unsigned long)saddrw, (unsigned long)eaddrw);
#endif

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

        for (addrw = saddrw; addrw < eaddrw; addrw++) {
#ifdef FLASH_DEBUG
                printf("  writing erase cmd to addr 0x%08lx\n",
                        (unsigned long)addrw);
#endif
                *addrw = BANK_CMD_ERASE1;
                *addrw = BANK_CMD_ERASE2;
        }

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

static int
bank_erase_poll(flash_info_t *info, int sect)
{
        bank_addr_t addrw, saddrw, eaddrw;
        int sectdone, haderr;

        saddrw = (bank_addr_t)info->start[sect];
        eaddrw = BANK_ADDR_NEXT_WORD(saddrw);

        sectdone = 1;
        haderr = 0;

        for (addrw = saddrw; addrw < eaddrw; addrw++) {
                bank_word_t stat = *addrw;

#ifdef FLASH_DEBUG
                printf("  checking status at addr "
                        "0x%08x [0x%08x]\n",
                        (unsigned long)addrw, stat);
#endif
                if ((stat & BANK_STAT_RDY) != BANK_STAT_RDY)
                        sectdone = 0;
                else if ((stat & BANK_STAT_ERR) != 0) {
                        printf(" failed on sector %d "
                                "(stat = 0x%08x) at "
                                "address 0x%p\n",
                                sect, stat, addrw);
                        *addrw = BANK_CMD_CLR_STAT;
                        haderr = 1;
                }
        }

        if (haderr)
                return (-1);
        else
                return (sectdone);
}

int
write_word_intel(bank_addr_t addr, bank_word_t value)
{
        bank_word_t stat;
        ulong start;
        int flag, retval;

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

        *addr = BANK_CMD_PROG;

        *addr = value;

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

        retval = 0;

        /* data polling for D7 */
        start = get_timer (0);
        do {
                if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
                        retval = 1;
                        goto done;
                }
                stat = *addr;
        } while ((stat & BANK_STAT_RDY) != BANK_STAT_RDY);

        if ((stat & BANK_STAT_ERR) != 0) {
                printf("flash program failed (stat = 0x%08lx) "
                        "at address 0x%08lx\n", (ulong)stat, (ulong)addr);
                *addr = BANK_CMD_CLR_STAT;
                retval = 3;
        }

done:
        /* reset to read mode */
        *addr = BANK_CMD_RST;

        return (retval);
}

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

int
flash_erase_intel(flash_info_t *info, int s_first, int s_last)
{
        int prot, sect, haderr;
        ulong start, now, last;

#ifdef FLASH_DEBUG
        printf("\nflash_erase: erase %d sectors (%d to %d incl.) from\n"
                "  Bank # %d: ", s_last - s_first + 1, s_first, s_last,
                (info - flash_info) + 1);
        flash_print_info(info);
#endif

        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 sector%s will not be erased!\n",
                        prot, (prot > 1 ? "s" : ""));
        }

        start = get_timer (0);
        last = 0;
        haderr = 0;

        for (sect = s_first; sect <= s_last; sect++) {
                if (info->protect[sect] == 0) { /* not protected */
                        ulong estart;
                        int sectdone;

                        bank_erase_init(info, sect);

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

                        estart = get_timer(start);

                        do {
                                now = get_timer(start);

                                if (now - estart > CONFIG_SYS_FLASH_ERASE_TOUT) {
                                        printf ("Timeout (sect %d)\n", sect);
                                        haderr = 1;
                                        break;
                                }

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

                                sectdone = bank_erase_poll(info, sect);

                                if (sectdone < 0) {
                                        haderr = 1;
                                        break;
                                }

                        } while (!sectdone);

                        if (haderr)
                                break;
                }
        }

        if (haderr > 0)
                printf (" failed\n");
        else
                printf (" done\n");

        /* reset to read mode */
        for (sect = s_first; sect <= s_last; sect++) {
                if (info->protect[sect] == 0) { /* not protected */
                        bank_reset(info, sect);
                }
        }
        return haderr;
}