/*
 * (C) Copyright 2003
 * MuLogic B.V.
 *
 * (C) Copyright 2001
 * 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 <ppc4xx.h>
#include <asm/u-boot.h>
#include <asm/processor.h>

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


#define FLASH_WORD_SIZE unsigned long
#define FLASH_ID_MASK 0xFFFFFFFF

/*-----------------------------------------------------------------------
 * Functions
 */
/* stolen from esteem192e/flash.c */
ulong flash_get_size (volatile FLASH_WORD_SIZE *addr, flash_info_t *info);

static int write_word (flash_info_t *info, ulong dest, ulong data);
static void flash_get_offsets (ulong base, flash_info_t *info);


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

unsigned long flash_init (void)
{
        unsigned long size_b0, size_b1;
        int i;
        uint pbcr;
        unsigned long base_b0, base_b1;
        volatile FLASH_WORD_SIZE* flash_base;

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

        /* Static FLASH Bank configuration here */
        /* Test for 8M Flash first */
        debug ("\n## Get flash bank 1 size @ 0x%08x\n",FLASH_BASE0_8M_PRELIM);
        flash_base = (volatile FLASH_WORD_SIZE*)(FLASH_BASE0_8M_PRELIM);
        size_b0 = flash_get_size(flash_base, &flash_info[0]);

        if (flash_info[0].flash_id == FLASH_UNKNOWN) {
                printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
                size_b0, size_b0<<20);
                return 0;
        }

        if (size_b0 < 8*1024*1024) {
                /* Not quite 8M, try 4M Flash base address */
                debug ("\n## Get flash bank 1 size @ 0x%08x\n",FLASH_BASE0_4M_PRELIM);
                flash_base = (volatile FLASH_WORD_SIZE*)(FLASH_BASE0_4M_PRELIM);
                size_b0 = flash_get_size(flash_base, &flash_info[0]);
        }

        if (flash_info[0].flash_id == FLASH_UNKNOWN) {
                printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
                size_b0, size_b0<<20);
                return 0;
        }

        /* Only one bank */
        if (CONFIG_SYS_MAX_FLASH_BANKS == 1) {
                /* Setup offsets */
                flash_get_offsets ((ulong)flash_base, &flash_info[0]);

                /* Monitor protection ON by default */
                (void)flash_protect(FLAG_PROTECT_SET, CONFIG_SYS_MONITOR_BASE,
                        CONFIG_SYS_MONITOR_BASE+CONFIG_SYS_MONITOR_LEN-1, &flash_info[0]);
                size_b1 = 0 ;
                flash_info[0].size = size_b0;
                return(size_b0);
        }

        /* We have 2 banks */
        size_b1 = flash_get_size(flash_base, &flash_info[1]);

        /* Re-do sizing to get full correct info */
        if (size_b1) {
                mtdcr(EBC0_CFGADDR, PB0CR);
                pbcr = mfdcr(EBC0_CFGDATA);
                mtdcr(EBC0_CFGADDR, PB0CR);
                base_b1 = -size_b1;
                pbcr = (pbcr & 0x0001ffff) | base_b1 | (((size_b1/1024/1024)-1)<<17);
                mtdcr(EBC0_CFGDATA, pbcr);
        }

        if (size_b0) {
                mtdcr(EBC0_CFGADDR, PB1CR);
                pbcr = mfdcr(EBC0_CFGDATA);
                mtdcr(EBC0_CFGADDR, PB1CR);
                base_b0 = base_b1 - size_b0;
                pbcr = (pbcr & 0x0001ffff) | base_b0 | (((size_b0/1024/1024)-1)<<17);
                mtdcr(EBC0_CFGDATA, pbcr);
        }

        size_b0 = flash_get_size((volatile FLASH_WORD_SIZE *)base_b0, &flash_info[0]);
        flash_get_offsets (base_b0, &flash_info[0]);

        /* monitor protection ON by default */
        (void)flash_protect(FLAG_PROTECT_SET, CONFIG_SYS_MONITOR_BASE,
                CONFIG_SYS_MONITOR_BASE+CONFIG_SYS_MONITOR_LEN-1, &flash_info[0]);

        if (size_b1) {
                /* Re-do sizing to get full correct info */
                size_b1 = flash_get_size((volatile FLASH_WORD_SIZE *)base_b1, &flash_info[1]);
                flash_get_offsets (base_b1, &flash_info[1]);

                /* monitor protection ON by default */
                (void)flash_protect(FLAG_PROTECT_SET, base_b1+size_b1-CONFIG_SYS_MONITOR_LEN,
                        base_b1+size_b1-1, &flash_info[1]);

                /* monitor protection OFF by default (one is enough) */
                (void)flash_protect(FLAG_PROTECT_CLEAR, base_b0+size_b0-CONFIG_SYS_MONITOR_LEN,
                        base_b0+size_b0-1, &flash_info[0]);
        } else {
                flash_info[1].flash_id = FLASH_UNKNOWN;
                flash_info[1].sector_count = -1;
        }

        flash_info[0].size = size_b0;
        flash_info[1].size = size_b1;
        return (size_b0 + size_b1);
}


/*-----------------------------------------------------------------------
 This code is specific to the AM29DL163/AM29DL232 for the QS850/QS823.
 */

static void flash_get_offsets (ulong base, flash_info_t *info)
{
        int i;
        long large_sect_size;
        long small_sect_size;

        /* set up sector start adress table */
        large_sect_size = info->size / (info->sector_count - 8 + 1);
        small_sect_size = large_sect_size / 8;

        if (info->flash_id & FLASH_BTYPE) {

                /* set sector offsets for bottom boot block type */
                for (i = 0; i < 7; i++) {
                        info->start[i] = base;
                        base += small_sect_size;
                }

                for (; i < info->sector_count; i++) {
                        info->start[i] = base;
                        base += large_sect_size;
                }
        }
        else
        {
                /* set sector offsets for top boot block type */
                for (i = 0; i < (info->sector_count - 8); i++) {
                        info->start[i] = base;
                        base += large_sect_size;
                }

                for (; i < info->sector_count; i++) {
                        info->start[i] = base;
                        base += small_sect_size;
                }
        }
}

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

void flash_print_info  (flash_info_t *info)
{
        int i;
        uchar *boottype;
        uchar botboot[]=", bottom boot sect)\n";
        uchar topboot[]=", top boot sector)\n";

        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_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;
        }

        if (info->flash_id & 0x0001 ) {
                boottype = botboot;
        } else {
                boottype = topboot;
        }

        switch (info->flash_id & FLASH_TYPEMASK) {
                case FLASH_AM160B:
                        printf ("AM29LV160B (16 Mbit%s",boottype);
                        break;
                case FLASH_AM160T:
                        printf ("AM29LV160T (16 Mbit%s",boottype);
                        break;
                case FLASH_AMDL163T:
                        printf ("AM29DL163T (16 Mbit%s",boottype);
                        break;
                case FLASH_AMDL163B:
                        printf ("AM29DL163B (16 Mbit%s",boottype);
                        break;
                case FLASH_AM320B:
                        printf ("AM29LV320B (32 Mbit%s",boottype);
                        break;
                case FLASH_AM320T:
                        printf ("AM29LV320T (32 Mbit%s",boottype);
                        break;
                case FLASH_AMDL323T:
                        printf ("AM29DL323T (32 Mbit%s",boottype);
                        break;
                case FLASH_AMDL323B:
                        printf ("AM29DL323B (32 Mbit%s",boottype);
                        break;
                case FLASH_AMDL322T:
                        printf ("AM29DL322T (32 Mbit%s",boottype);
                        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 % 5) == 0)
                        printf ("\n   ");
                printf (" %08lX%s", info->start[i],
                        info->protect[i] ? " (RO)" : "     ");
        }
        printf ("\n");
        return;
}


/*-----------------------------------------------------------------------
 * The following code cannot be run from FLASH!
 */
ulong flash_get_size (volatile FLASH_WORD_SIZE *addr, flash_info_t *info)
{
        short i;
        ulong base = (ulong)addr;
        FLASH_WORD_SIZE value;

        /* Write auto select command: read Manufacturer ID */

        /*
         * Note: if it is an AMD flash and the word at addr[0000]
         * is 0x00890089 this routine will think it is an Intel
         * flash device and may(most likely) cause trouble.
         */

        addr[0x0000] = 0x00900090;
        if(addr[0x0000] != 0x00890089){
                addr[0x0555] = 0x00AA00AA;
                addr[0x02AA] = 0x00550055;
                addr[0x0555] = 0x00900090;
        }
        value = addr[0];

        switch (value) {
                case (AMD_MANUFACT & FLASH_ID_MASK):
                        info->flash_id = FLASH_MAN_AMD;
                        break;
                case (FUJ_MANUFACT & FLASH_ID_MASK):
                        info->flash_id = FLASH_MAN_FUJ;
                        break;
                case (STM_MANUFACT & FLASH_ID_MASK):
                        info->flash_id = FLASH_MAN_STM;
                        break;
                case (SST_MANUFACT & FLASH_ID_MASK):
                        info->flash_id = FLASH_MAN_SST;
                        break;
                case (INTEL_MANUFACT & FLASH_ID_MASK):
                        info->flash_id = FLASH_MAN_INTEL;
                        break;
                default:
                        info->flash_id = FLASH_UNKNOWN;
                        info->sector_count = 0;
                        info->size = 0;
                        return (0); /* no or unknown flash */
        }

        value = addr[1]; /* device ID */

        switch (value) {
                case (AMD_ID_LV160T & FLASH_ID_MASK):
                        info->flash_id += FLASH_AM160T;
                        info->sector_count = 35;
                        info->size = 0x00400000;
                        break; /* => 4 MB */

                case (AMD_ID_LV160B & FLASH_ID_MASK):
                        info->flash_id += FLASH_AM160B;
                        info->sector_count = 35;
                        info->size = 0x00400000;
                        break; /* => 4 MB */

                case (AMD_ID_DL163T & FLASH_ID_MASK):
                        info->flash_id += FLASH_AMDL163T;
                        info->sector_count = 39;
                        info->size = 0x00400000;
                        break; /* => 4 MB */

                case (AMD_ID_DL163B & FLASH_ID_MASK):
                        info->flash_id += FLASH_AMDL163B;
                        info->sector_count = 39;
                        info->size = 0x00400000;
                        break; /* => 4 MB */

                case (AMD_ID_DL323T & FLASH_ID_MASK):
                        info->flash_id += FLASH_AMDL323T;
                        info->sector_count = 71;
                        info->size = 0x00800000;
                        break; /* => 8 MB */

                case (AMD_ID_DL323B & FLASH_ID_MASK):
                        info->flash_id += FLASH_AMDL323B;
                        info->sector_count = 71;
                        info->size = 0x00800000;
                        break; /* => 8 MB */

                case (AMD_ID_DL322T & FLASH_ID_MASK):
                        info->flash_id += FLASH_AMDL322T;
                        info->sector_count = 71;
                        info->size = 0x00800000;
                        break; /* => 8 MB */

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

        flash_get_offsets(base, info);

        /* check for protected sectors */
        for (i = 0; i < info->sector_count; i++) {
                /* read sector protection at sector address, (A7 .. A0) = 0x02 */
                /* D0 = 1 if protected */
                addr = (volatile FLASH_WORD_SIZE *)(info->start[i]);
                info->protect[i] = addr[2] & 1;
        }

        /*
         * Prevent writes to uninitialized FLASH.
         */
        if (info->flash_id != FLASH_UNKNOWN) {
                addr = (volatile FLASH_WORD_SIZE *)info->start[0];
                *addr = (0x00FF00FF & FLASH_ID_MASK);   /* reset bank */
        }

        return (info->size);
}


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

int flash_erase (flash_info_t *info, int s_first, int s_last)
{
        volatile FLASH_WORD_SIZE *addr=(volatile FLASH_WORD_SIZE*)(info->start[0]);
        int flag, prot, sect, l_sect;
        ulong start, now, last;
        int rcode = 0;

        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;
        }

        if ((info->flash_id == FLASH_UNKNOWN) ||
                (info->flash_id > FLASH_AMD_COMP) ) {
                printf ("Can't erase unknown flash type - aborted\n");
                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");
        }

        l_sect = -1;

        /* Disable interrupts which might cause a timeout here */
        flag = disable_interrupts();
        addr[0x0555] = 0x00AA00AA;
        addr[0x02AA] = 0x00550055;
        addr[0x0555] = 0x00800080;
        addr[0x0555] = 0x00AA00AA;
        addr[0x02AA] = 0x00550055;
        /* Start erase on unprotected sectors */
        for (sect = s_first; sect<=s_last; sect++) {
                if (info->protect[sect] == 0) { /* not protected */
                        addr = (volatile FLASH_WORD_SIZE *)(info->start[sect]);
                        addr[0] = (0x00300030 & FLASH_ID_MASK);
                        l_sect = sect;
                }
        }

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

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

        /*
         * We wait for the last triggered sector
         */
        if (l_sect < 0)
                goto DONE;

        start = get_timer (0);
        last  = start;
        addr = (volatile FLASH_WORD_SIZE*)(info->start[l_sect]);
        while ((addr[0] & (0x00800080&FLASH_ID_MASK)) !=
                        (0x00800080&FLASH_ID_MASK)  )
        {
                if ((now = get_timer(start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
                        printf ("Timeout\n");
                        return 1;
                }
                /* show that we're waiting */
                if ((now - last) > 1000) { /* every second */
                        serial_putc ('.');
                        last = now;
                }
        }

DONE:
        /* reset to read mode */
        addr = (volatile FLASH_WORD_SIZE *)info->start[0];
        addr[0] = (0x00F000F0 & FLASH_ID_MASK); /* reset bank */

        printf (" done\n");
        return rcode;
}

/*-----------------------------------------------------------------------
 * 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)
{
        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);
                }
                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
         */
        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;
        }

        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
 */
static int write_word (flash_info_t *info, ulong dest, ulong data)
{
        vu_long *addr = (vu_long*)(info->start[0]);
        ulong start;
        int flag;

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

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

        /* AMD stuff */
        addr[0x0555] = 0x00AA00AA;
        addr[0x02AA] = 0x00550055;
        addr[0x0555] = 0x00A000A0;

        *((vu_long *)dest) = data;

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

        /* data polling for D7 */
        start = get_timer(0);

        while ((*((vu_long *)dest) & 0x00800080) != (data & 0x00800080)) {
                if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
                        return (1);
                }
        }

        return (0);
}