/* * (C) Copyright 2000 * Marius Groeger <mgroeger@sysgo.de> * Sysgo Real-Time Solutions, GmbH <www.elinos.com> * * (C) Copyright 2000 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. * * Flash Routines for AMD 29F080B devices * *-------------------------------------------------------------------- * 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 <mpc8xx.h>flash_info_t flash_info[CFG_MAX_FLASH_BANKS];/*----------------------------------------------------------------------- * Functions */static ulong flash_get_size (vu_long *addr, flash_info_t *info);static int write_word (flash_info_t *info, ulong dest, ulong data);/*----------------------------------------------------------------------- */unsigned long flash_init (void){    unsigned long size;    int i;    /* Init: no FLASHes known */    for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {	flash_info[i].flash_id = FLASH_UNKNOWN;    }    /* for now, only support the 4 MB Flash SIMM */    size = flash_get_size((vu_long *)CFG_FLASH0_BASE, &flash_info[0]);    /*     * protect monitor and environment sectors     */#if CFG_MONITOR_BASE >= CFG_FLASH0_BASE    flash_protect(FLAG_PROTECT_SET,		  CFG_MONITOR_BASE,		  CFG_MONITOR_BASE+monitor_flash_len-1,		  &flash_info[0]);#endif#if (CFG_ENV_IS_IN_FLASH == 1) && defined(CFG_ENV_ADDR)# ifndef  CFG_ENV_SIZE#  define CFG_ENV_SIZE	CFG_ENV_SECT_SIZE# endif    flash_protect(FLAG_PROTECT_SET,		  CFG_ENV_ADDR,		  CFG_ENV_ADDR + CFG_ENV_SIZE - 1,		  &flash_info[0]);#endif    return /*size*/ (CFG_FLASH0_SIZE * 1024 * 1024);}/*----------------------------------------------------------------------- */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 >> 16) & 0xff) {    case 0x1:	printf ("AMD ");	break;    default:	printf ("Unknown Vendor ");	break;    }    switch (info->flash_id & FLASH_TYPEMASK) {    case AMD_ID_F040B:	printf ("AM29F040B (4 Mbit)\n");	break;    case AMD_ID_F080B:	printf ("AM29F080B (8 Mbit)\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 % 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! */static ulong flash_get_size (vu_long *addr, flash_info_t *info){    short i;    vu_long vendor, devid;    ulong base = (ulong)addr;/*    printf("addr   = %08lx\n", (unsigned long)addr); */    /* Reset and Write auto select command: read Manufacturer ID */    addr[0] = 0xf0f0f0f0;    addr[0x0555] = 0xAAAAAAAA;    addr[0x02AA] = 0x55555555;    addr[0x0555] = 0x90909090;    udelay (1000);    vendor = addr[0];/*    printf("vendor = %08lx\n", vendor); */    if (vendor != 0x01010101) {	info->size = 0;	goto out;    }    devid = addr[1];/*    printf("devid  = %08lx\n", devid); */    if ((devid & 0xff) == AMD_ID_F080B) {	info->flash_id     = (vendor & 0xff) << 16 | AMD_ID_F080B;	/* we have 16 sectors with 64KB each x 4 */	info->sector_count = 16;	info->size         = 4 * info->sector_count * 64*1024;    }    else {	info->size = 0;	goto out;    }    /* check for protected sectors */    for (i = 0; i < info->sector_count; i++) {	/* sector base address */	info->start[i] = base + i * (info->size / info->sector_count);	/* read sector protection at sector address, (A7 .. A0) = 0x02 */	/* D0 = 1 if protected */	addr = (volatile unsigned long *)(info->start[i]);	info->protect[i] = addr[2] & 1;    }    /* reset command */    addr = (vu_long *)info->start[0];out:    addr[0] = 0xf0f0f0f0;    return info->size;}/*----------------------------------------------------------------------- */int flash_erase (flash_info_t *info, int s_first, int s_last){    vu_long *addr = (vu_long*)(info->start[0]);    int flag, prot, sect, l_sect;    ulong start, now, last;    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 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] = 0xAAAAAAAA;    addr[0x02AA] = 0x55555555;    addr[0x0555] = 0x80808080;    addr[0x0555] = 0xAAAAAAAA;    addr[0x02AA] = 0x55555555;    udelay (100);    /* Start erase on unprotected sectors */    for (sect = s_first; sect<=s_last; sect++) {	if (info->protect[sect] == 0) {	/* not protected */	    addr = (vu_long*)(info->start[sect]);	    addr[0] = 0x30303030;	    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 = (vu_long*)(info->start[l_sect]);    while ((addr[0] & 0x80808080) != 0x80808080) {	if ((now = get_timer(start)) > CFG_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 unsigned long *)info->start[0];    addr[0] = 0xF0F0F0F0;	/* reset bank */    printf (" done\n");    return 0;}/*----------------------------------------------------------------------- * 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 i, l, 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();    addr[0x0555] = 0xAAAAAAAA;    addr[0x02AA] = 0x55555555;    addr[0x0555] = 0xA0A0A0A0;    *((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) & 0x80808080) != (data & 0x80808080)) {	if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {	    return (1);	}    }    return (0);}/*----------------------------------------------------------------------- */