/*
 * (C) Copyright 2002
 * Kyle Harris, Nexus Technologies, Inc. kharris@nexus-tech.net
 *
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Marius Groeger <mgroeger@sysgo.de>
 *
 * (C) Copyright 2002
 * Robert Schwebel, Pengutronix, <r.schwebel@pengutronix.de>
 *
 * (C) Copyright 2003 (2 x 16 bit Flash bank patches)
 * Rolf Peukert, IMMS gGmbH, <rolf.peukert@imms.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/arch/pxa-regs.h>

#define FLASH_BANK_SIZE 0x02000000
#define MAIN_SECT_SIZE  0x40000         /* 2x16 = 256k per sector */

flash_info_t    flash_info[CONFIG_SYS_MAX_FLASH_BANKS];


/**
 * flash_init: - initialize data structures for flash chips
 *
 * @return: size of the flash
 */

ulong 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 =
                        (INTEL_MANUFACT & FLASH_VENDMASK) |
                        (INTEL_ID_28F128J3 & 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);

                switch (i) {
                case 0:
                        flashbase = PHYS_FLASH_1;
                        break;
                default:
                        panic("configured too many flash banks!\n");
                        break;
                }
                for (j = 0; j < flash_info[i].sector_count; j++) {
                        flash_info[i].start[j] = flashbase + j*MAIN_SECT_SIZE;
                }
                size += flash_info[i].size;
        }

        /* Protect monitor and environment sectors */
        flash_protect(FLAG_PROTECT_SET,
                        CONFIG_SYS_FLASH_BASE,
                        CONFIG_SYS_FLASH_BASE + monitor_flash_len - 1,
                        &flash_info[0]);

        flash_protect(FLAG_PROTECT_SET,
                        CONFIG_ENV_ADDR,
                        CONFIG_ENV_ADDR + CONFIG_ENV_SIZE - 1,
                        &flash_info[0]);

        return size;
}


/**
 * flash_print_info: - print information about the flash situation
 */

void flash_print_info  (flash_info_t *info)
{
        int i, j;

        for (j=0; j<CONFIG_SYS_MAX_FLASH_BANKS; j++) {

                switch (info->flash_id & FLASH_VENDMASK) {
                case (INTEL_MANUFACT & FLASH_VENDMASK):
                        printf ("Intel: ");
                        break;
                default:
                        printf ("Unknown Vendor ");
                        break;
                }

                switch (info->flash_id & FLASH_TYPEMASK) {
                case (INTEL_ID_28F128J3 & FLASH_TYPEMASK):
                        printf("28F128J3 (128Mbit)\n");
                        break;
                default:
                        printf("Unknown Chip Type\n");
                        return;
                }

                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");
                info++;
        }
}


/**
 * flash_erase: - erase flash sectors
 */

int flash_erase(flash_info_t *info, int s_first, int s_last)
{
        int flag, prot, sect;
        int rc = ERR_OK;

        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) != (INTEL_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.
         */

        flag = disable_interrupts();

        /* 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 */
                reset_timer_masked();

                if (info->protect[sect] == 0) { /* not protected */
                        u32 * volatile addr = (u32 * volatile)(info->start[sect]);

                        /* erase sector:                                    */
                        /* The strata flashs are aligned side by side on    */
                        /* the data bus, so we have to write the commands   */
                        /* to both chips here:                              */

                        *addr = 0x00200020;     /* erase setup */
                        *addr = 0x00D000D0;     /* erase confirm */

                        while ((*addr & 0x00800080) != 0x00800080) {
                                if (get_timer_masked() > CONFIG_SYS_FLASH_ERASE_TOUT) {
                                        *addr = 0x00B000B0; /* suspend erase*/
                                        *addr = 0x00FF00FF; /* read mode    */
                                        rc = ERR_TIMOUT;
                                        goto outahere;
                                }
                        }
                        *addr = 0x00500050; /* clear status register cmd.   */
                        *addr = 0x00FF00FF; /* reset to read mode           */
                }
                printf("ok.\n");
        }
        if (ctrlc()) printf("User Interrupt!\n");

outahere:
        /* allow flash to settle - wait 10 ms */
        udelay_masked(10000);

        if (flag) enable_interrupts();

        return rc;
}

/**
 * write_long: - copy memory to flash, assume a bank of 2 devices with 16bit each
 */

static int write_long (flash_info_t *info, ulong dest, ulong data)
{
        u32 * volatile addr = (u32 * volatile)dest, val;
        int rc = ERR_OK;
        int flag;

        /* read array command - just for the case... */
        *addr = 0x00FF00FF;

        /* Check if Flash is (sufficiently) erased */
        if ((*addr & 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.
         */
        flag = disable_interrupts();

        /* clear status register command */
        *addr = 0x00500050;

        /* program set-up command */
        *addr = 0x00400040;

        /* latch address/data */
        *addr = data;

        /* arm simple, non interrupt dependent timer */
        reset_timer_masked();

        /* wait while polling the status register */
        while(((val = *addr) & 0x00800080) != 0x00800080) {
                if (get_timer_masked() > CONFIG_SYS_FLASH_WRITE_TOUT) {
                        rc = ERR_TIMOUT;
                        /* suspend program command */
                        *addr = 0x00B000B0;
                        goto outahere;
                }
        }

        /* check for errors */
        if(val & 0x001A001A) {
                printf("\nFlash write error %02x at address %08lx\n",
                        (int)val, (unsigned long)dest);
                if(val & 0x00080008) {
                        printf("Voltage range error.\n");
                        rc = ERR_PROG_ERROR;
                        goto outahere;
                }
                if(val & 0x00020002) {
                        printf("Device protect error.\n");
                        rc = ERR_PROTECTED;
                        goto outahere;
                }
                if(val & 0x00100010) {
                        printf("Programming error.\n");
                        rc = ERR_PROG_ERROR;
                        goto outahere;
                }
                rc = ERR_PROG_ERROR;
                goto outahere;
        }

outahere:
        /* read array command */
        *addr = 0x00FF00FF;
        if (flag) enable_interrupts();

        return rc;
}


/**
 * write_buf: - Copy memory to flash.
 *
 * @param info:
 * @param src:  source of copy transaction
 * @param addr: where to copy to
 * @param cnt:  number of bytes to copy
 *
 * @return      error code
 */

/* "long" version, uses 32bit words */
int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
{
        ulong cp, wp;
        ulong 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 << 24);
                }
                for (; i<4 && cnt>0; ++i) {
                        data = (data >> 8) | (*src++ << 24);
                        --cnt;
                        ++cp;
                }
                for (; cnt==0 && i<4; ++i, ++cp) {
                        data = (data >> 8) | (*(uchar *)cp << 24);
                }

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

        /*
         * handle word aligned part
         */
        while (cnt >= 4) {
                data = *((ulong*)src);
                if ((rc = write_long(info, wp, data)) != 0) {
                        return (rc);
                }
                src += 4;
                wp  += 4;
                cnt -= 4;
        }

        if (cnt == 0) return ERR_OK;

        /*
         * handle unaligned tail bytes
         */
        data = 0;
        for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
                data = (data >> 8) | (*src++ << 24);
                --cnt;
        }
        for (; i<4; ++i, ++cp) {
                data = (data >> 8) | (*(uchar *)cp << 24);
        }

        return write_long(info, wp, data);
}