/*
 * (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
 */

#include <common.h>
#include <board/cogent/flash.h>
#include <linux/compiler.h>

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

#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

/*-----------------------------------------------------------------------
 * Functions
 */
static int write_word (flash_info_t *info, ulong dest, ulong data);

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


#if defined(CONFIG_CMA302)

/*
 * probe for the existence of flash at address "addr"
 * 0 = yes, 1 = bad Manufacturer's Id, 2 = bad Device Id
 */
static int
c302f_probe_word(c302f_addr_t addr)
{
        /* reset the flash */
        *addr = C302F_BNK_CMD_RST;

        /* check the manufacturer id */
        *addr = C302F_BNK_CMD_RD_ID;
        if (*C302F_BNK_ADDR_MAN(addr) != C302F_BNK_RD_ID_MAN)
                return 1;

        /* check the device id */
        *addr = C302F_BNK_CMD_RD_ID;
        if (*C302F_BNK_ADDR_DEV(addr) != C302F_BNK_RD_ID_DEV)
                return 2;

#ifdef FLASH_DEBUG
        {
                int i;

                printf("\nMaster Lock Config = 0x%08lx\n",
                        *C302F_BNK_ADDR_CFGM(addr));
                for (i = 0; i < C302F_BNK_NBLOCKS; i++)
                        printf("Block %2d Lock Config = 0x%08lx\n",
                                i, *C302F_BNK_ADDR_CFG(i, addr));
        }
#endif

        /* reset the flash again */
        *addr = C302F_BNK_CMD_RST;

        return 0;
}

/*
 * probe for Cogent CMA302 flash module at address "base" and store
 * info for any found into flash_info entry "fip". Must find at least
 * one bank.
 */
static void
c302f_probe(flash_info_t *fip, c302f_addr_t base)
{
        c302f_addr_t addr, eaddr;
        int nbanks;

        fip->size = 0L;
        fip->sector_count = 0;

        addr = base;
        eaddr = C302F_BNK_ADDR_BASE(addr, C302F_MAX_BANKS);
        nbanks = 0;

        while (addr < eaddr) {
                c302f_addr_t addrw, eaddrw, addrb;
                int i, osc, nsc;

                addrw = addr;
                eaddrw = C302F_BNK_ADDR_NEXT_WORD(addrw);

                while (addrw < eaddrw)
                        if (c302f_probe_word(addrw++) != 0)
                                goto out;

                /* bank exists - append info for this bank to *fip */
                fip->flash_id = FLASH_MAN_INTEL|FLASH_28F008S5;
                fip->size += C302F_BNK_SIZE;
                osc = fip->sector_count;
                fip->sector_count += C302F_BNK_NBLOCKS;
                if ((nsc = fip->sector_count) >= CONFIG_SYS_MAX_FLASH_SECT)
                        panic("Too many sectors in flash at address 0x%08lx\n",
                                (unsigned long)base);

                addrb = addr;
                for (i = osc; i < nsc; i++) {
                        fip->start[i] = (ulong)addrb;
                        fip->protect[i] = 0;
                        addrb = C302F_BNK_ADDR_NEXT_BLK(addrb);
                }

                addr = C302F_BNK_ADDR_NEXT_BNK(addr);
                nbanks++;
        }

out:
        if (nbanks == 0)
                panic("ERROR: no flash found at address 0x%08lx\n",
                        (unsigned long)base);
}

static void
c302f_reset(flash_info_t *info, int sect)
{
        c302f_addr_t addrw, eaddrw;

        addrw = (c302f_addr_t)info->start[sect];
        eaddrw = C302F_BNK_ADDR_NEXT_WORD(addrw);

        while (addrw < eaddrw) {
#ifdef FLASH_DEBUG
                printf("  writing reset cmd to addr 0x%08lx\n",
                        (unsigned long)addrw);
#endif
                *addrw = C302F_BNK_CMD_RST;
                addrw++;
        }
}

static void
c302f_erase_init(flash_info_t *info, int sect)
{
        c302f_addr_t addrw, saddrw, eaddrw;
        int flag;

#ifdef FLASH_DEBUG
        printf("0x%08lx C302F_BNK_CMD_PROG\n", C302F_BNK_CMD_PROG);
        printf("0x%08lx C302F_BNK_CMD_ERASE1\n", C302F_BNK_CMD_ERASE1);
        printf("0x%08lx C302F_BNK_CMD_ERASE2\n", C302F_BNK_CMD_ERASE2);
        printf("0x%08lx C302F_BNK_CMD_CLR_STAT\n", C302F_BNK_CMD_CLR_STAT);
        printf("0x%08lx C302F_BNK_CMD_RST\n", C302F_BNK_CMD_RST);
        printf("0x%08lx C302F_BNK_STAT_RDY\n", C302F_BNK_STAT_RDY);
        printf("0x%08lx C302F_BNK_STAT_ERR\n", C302F_BNK_STAT_ERR);
#endif

        saddrw = (c302f_addr_t)info->start[sect];
        eaddrw = C302F_BNK_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 = C302F_BNK_CMD_ERASE1;
                *addrw = C302F_BNK_CMD_ERASE2;
        }

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

static int
c302f_erase_poll(flash_info_t *info, int sect)
{
        c302f_addr_t addrw, saddrw, eaddrw;
        int sectdone, haderr;

        saddrw = (c302f_addr_t)info->start[sect];
        eaddrw = C302F_BNK_ADDR_NEXT_WORD(saddrw);

        sectdone = 1;
        haderr = 0;

        for (addrw = saddrw; addrw < eaddrw; addrw++) {
                c302f_word_t stat = *addrw;

#ifdef FLASH_DEBUG
                printf("  checking status at addr "
                        "0x%08lx [0x%08lx]\n",
                        (unsigned long)addrw, stat);
#endif
                if ((stat & C302F_BNK_STAT_RDY) != C302F_BNK_STAT_RDY)
                        sectdone = 0;
                else if ((stat & C302F_BNK_STAT_ERR) != 0) {
                        printf(" failed on sector %d "
                                "(stat = 0x%08lx) at "
                                "address 0x%08lx\n",
                                sect, stat,
                                (unsigned long)addrw);
                        *addrw = C302F_BNK_CMD_CLR_STAT;
                        haderr = 1;
                }
        }

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

static int
c302f_write_word(c302f_addr_t addr, c302f_word_t value)
{
        c302f_word_t stat;
        ulong start;
        int flag, retval;

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

        *addr = C302F_BNK_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 & C302F_BNK_STAT_RDY) != C302F_BNK_STAT_RDY);

        if ((stat & C302F_BNK_STAT_ERR) != 0) {
                printf("flash program failed (stat = 0x%08lx) "
                        "at address 0x%08lx\n", (ulong)stat, (ulong)addr);
                *addr = C302F_BNK_CMD_CLR_STAT;
                retval = 3;
        }

done:
        /* reset to read mode */
        *addr = C302F_BNK_CMD_RST;

        return (retval);
}

#endif  /* CONFIG_CMA302 */

unsigned long
flash_init(void)
{
        unsigned long total;
        int i;
        __maybe_unused flash_info_t *fip;

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

        fip = &flash_info[0];
        total = 0L;

#if defined(CONFIG_CMA302)
        c302f_probe(fip, (c302f_addr_t)CONFIG_SYS_FLASH_BASE);
        total += fip->size;
        fip++;
#endif

#if (CMA_MB_CAPS & CMA_MB_CAP_FLASH)
        /* not yet ...
        cmbf_probe(fip, (cmbf_addr_t)CMA_MB_FLASH_BASE);
        total += fip->size;
        fip++;
        */
#endif

        /*
         * protect monitor and environment sectors
         */

#if CONFIG_SYS_MONITOR_BASE == CONFIG_SYS_FLASH_BASE
        flash_protect(FLAG_PROTECT_SET,
                      CONFIG_SYS_MONITOR_BASE,
                      CONFIG_SYS_MONITOR_BASE+monitor_flash_len-1,
                      &flash_info[0]);
#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_SECT_SIZE-1,
                      &flash_info[0]);
#endif
        return total;
}

/*-----------------------------------------------------------------------
 */
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_INTEL:   printf ("INTEL ");              break;
        default:                printf ("Unknown Vendor ");     break;
        }

        switch (info->flash_id & FLASH_TYPEMASK) {
        case FLASH_28F008S5:    printf ("28F008S5\n");
                                break;
        default:                printf ("Unknown Chip Type\n");
                                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 % 4) == 0)
                        printf ("\n   ");
                printf (" %2d - %08lX%s", i,
                        info->start[i],
                        info->protect[i] ? " (RO)" : "     "
                );
        }
        printf ("\n");
        return;
}

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


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

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

int
flash_erase(flash_info_t *info, int s_first, int s_last)
{
        int prot, sect, haderr;
        ulong start, now, last;
        void (*erase_init)(flash_info_t *, int);
        int (*erase_poll)(flash_info_t *, int);
        void (*reset)(flash_info_t *, int);
        int rcode = 0;

#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;
        }

        switch (info->flash_id) {

#if defined(CONFIG_CMA302)
        case FLASH_MAN_INTEL|FLASH_28F008S5:
                erase_init = c302f_erase_init;
                erase_poll = c302f_erase_poll;
                reset = c302f_reset;
                break;
#endif

#if (CMA_MB_CAPS & CMA_MB_CAP_FLASH)
        case FLASH_MAN_INTEL|FLASH_28F800_B:
        case FLASH_MAN_AMD|FLASH_AM29F800B:
                /* not yet ...
                erase_init = cmbf_erase_init;
                erase_poll = cmbf_erase_poll;
                reset = cmbf_reset;
                break;
                */
#endif

        default:
                printf ("Flash type %08lx not supported - 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 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;

                        (*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 = (*erase_poll)(info, sect);

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

                        } while (!sectdone);

                        if (haderr)
                                break;
                }
        }

        if (haderr > 0) {
                printf (" failed\n");
                rcode = 1;
        }
        else
                printf (" done\n");

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

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

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

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

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

        /*
         * handle word aligned part
         */
        start = get_timer (0);
        last = 0;
        while (cnt >= 4) {
                data = 0;
                for (i=0; i<4; ++i) {
                        data = (data << 8) | *src++;
                }
                if ((rc = write_word(info, wp, data)) != 0) {
                        return (rc);
                }
                wp  += 4;
                cnt -= 4;

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

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

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

        return (write_word(info, wp, data));
}

/*-----------------------------------------------------------------------
 * Write a word to Flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 * 3 - write error
 */
static int
write_word(flash_info_t *info, ulong dest, ulong data)
{
        int retval;

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

        switch (info->flash_id) {

#if defined(CONFIG_CMA302)
        case FLASH_MAN_INTEL|FLASH_28F008S5:
                retval = c302f_write_word((c302f_addr_t)dest, (c302f_word_t)data);
                break;
#endif

#if (CMA_MB_CAPS & CMA_MB_CAP_FLASH)
        case FLASH_MAN_INTEL|FLASH_28F800_B:
        case FLASH_MAN_AMD|FLASH_AM29F800B:
                /* not yet ...
                retval = cmbf_write_word((cmbf_addr_t)dest, (cmbf_word_t)data);
                */
                retval = 3;
                break;
#endif

        default:
                printf ("Flash type %08lx not supported - aborted\n",
                        info->flash_id);
                retval = 3;
                break;
        }

        return (retval);
}

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