/* * (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 *//* * Modified 4/5/2001 * Wait for completion of each sector erase command issued * 4/5/2001 * Chris Hallinan - DS4.COM, Inc. - clh@net1plus.com *//* * Modified July 20, 2001 * Strip down to support ONLY the AMD29F032B. * Dave Updegraff - Cray, Inc. dave@cray.com */#include <common.h>#include <ppc4xx.h>#include <asm/processor.h>/* The flash chip we use... */#define AMD_ID_F032B	0x41	/* 29F032B ID  32 Mbit,64 64Kx8 sectors */#define FLASH_AM320B    0x0009flash_info_t	flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips	*//*----------------------------------------------------------------------- * 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);static void flash_get_offsets (ulong base, flash_info_t *info);#define ADDR0           0x5555#define ADDR1           0x2aaa#define FLASH_WORD_SIZE unsigned char/*----------------------------------------------------------------------- */unsigned long flash_init (void){	unsigned long size_b0, size_b1;	int i;	/* Init: no FLASHes known */	for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {		flash_info[i].flash_id = FLASH_UNKNOWN;	}	/* Static FLASH Bank configuration here - FIXME XXX */	size_b0 = flash_get_size((vu_long *)FLASH_BASE0_PRELIM, &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);	}	/* Only one bank */	if (CFG_MAX_FLASH_BANKS == 1)	  {	    /* Setup offsets */	    flash_get_offsets (FLASH_BASE0_PRELIM, &flash_info[0]);#if 0	    /* Monitor protection ON by default */	    (void)flash_protect(FLAG_PROTECT_SET,				FLASH_BASE0_PRELIM,				FLASH_BASE0_PRELIM+monitor_flash_len-1,				&flash_info[0]);#endif	    size_b1 = 0 ;	    flash_info[0].size = size_b0;	  }	return (size_b0 + size_b1);}/*----------------------------------------------------------------------- */static void flash_get_offsets (ulong base, flash_info_t *info){	int i;	/* set up sector start address table */	for (i = 0; i < info->sector_count; i++)		info->start[i] = base + (i * 0x00010000);}/*----------------------------------------------------------------------- */void flash_print_info  (flash_info_t *info){	int i;	int k;	int size;	int erased;	volatile unsigned long *flash;	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;	default:		printf ("Unknown Vendor ");	break;	}	switch (info->flash_id & FLASH_TYPEMASK) {	case FLASH_AM320B:printf ("AM29F032B (32 Mbit 64x64KB uniform sectors)\n");				break;	default:		printf ("Unknown Chip Type\n");				break;	}	printf ("  Size: %ld KB in %d Sectors\n",		info->size >> 10, info->sector_count);	printf ("  Sector Start Addresses:");	for (i=0; i<info->sector_count; ++i) {		/*		 * Check if whole sector is erased		 */		if (i != (info->sector_count-1))		  size = info->start[i+1] - info->start[i];		else		  size = info->start[0] + info->size - info->start[i];		erased = 1;		flash = (volatile unsigned long *)info->start[i];		size = size >> 2;        /* divide by 4 for longword access */		for (k=0; k<size; k++)		  {		    if (*flash++ != 0xffffffff)		      {			erased = 0;			break;		      }		  }		if ((i % 5) == 0)			printf ("\n   ");		printf (" %08lX%s%s",			info->start[i],			erased ? " E" : "  ",			info->protect[i] ? "RO " : "   "		);	}	printf ("\n");}/*----------------------------------------------------------------------- *//*----------------------------------------------------------------------- *//* * The following code cannot be run from FLASH! */static ulong flash_get_size (vu_long *addr, flash_info_t *info){	short i;	FLASH_WORD_SIZE value;	ulong base = (ulong)addr;	volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *)addr;	/* Write auto select command: read Manufacturer ID */	addr2[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;	addr2[ADDR1] = (FLASH_WORD_SIZE)0x00550055;	addr2[ADDR0] = (FLASH_WORD_SIZE)0x00900090;	value = addr2[0];	switch (value) {	case (FLASH_WORD_SIZE)AMD_MANUFACT:		info->flash_id = FLASH_MAN_AMD;		break;	default:		info->flash_id = FLASH_UNKNOWN;		info->sector_count = 0;		info->size = 0;		return (0);			/* no or unknown flash	*/	}	value = addr2[1];			/* device ID		*/	switch (value) {	case (FLASH_WORD_SIZE)AMD_ID_F032B:		info->flash_id += FLASH_AM320B;		info->sector_count = 64;		info->size = 0x0400000; /* => 4 MB */		break;	default:		info->flash_id = FLASH_UNKNOWN;		return (0);			/* => no or unknown flash */	}	/* set up sector start address table */	for (i = 0; i < info->sector_count; i++)		info->start[i] = base + (i * 0x00010000);	/* 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 */		addr2 = (volatile FLASH_WORD_SIZE *)(info->start[i]);	info->protect[i] = addr2[2] & 1;	}	/*	 * Prevent writes to uninitialized FLASH.	 */	if (info->flash_id != FLASH_UNKNOWN) {		addr2 = (FLASH_WORD_SIZE *)info->start[0];		*addr2 = (FLASH_WORD_SIZE)0x00F000F0;	/* reset bank */	}	return (info->size);}int wait_for_DQ7(flash_info_t *info, int sect){	ulong start, now, last;	volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *)(info->start[sect]);	start = get_timer (0);    last  = start;    while ((addr[0] & (FLASH_WORD_SIZE)0x00800080) != (FLASH_WORD_SIZE)0x00800080) {	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 */	    putc ('.');	    last = now;	}    }	return 0;}/*----------------------------------------------------------------------- */int	flash_erase (flash_info_t *info, int s_first, int s_last){	volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *)(info->start[0]);	volatile FLASH_WORD_SIZE *addr2;	int flag, prot, sect, l_sect;	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) {		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();	/* Start erase on unprotected sectors */	for (sect = s_first; sect<=s_last; sect++) {		if (info->protect[sect] == 0) {	/* not protected */		    addr2 = (FLASH_WORD_SIZE *)(info->start[sect]);		    printf("Erasing sector %p\n", addr2);			addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;			addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;			addr[ADDR0] = (FLASH_WORD_SIZE)0x00800080;			addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;			addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;			addr2[0] = (FLASH_WORD_SIZE)0x00300030;  /* sector erase */		    l_sect = sect;		    /*		     * Wait for each sector to complete, it's more		     * reliable.  According to AMD Spec, you must		     * issue all erase commands within a specified		     * timeout.  This has been seen to fail, especially		     * if printf()s are included (for debug)!!		     */		    wait_for_DQ7(info, sect);		}	}	/* re-enable interrupts if necessary */	if (flag)		enable_interrupts();	/* wait at least 80us - let's wait 1 ms */	udelay (1000);	/* reset to read mode */	addr = (FLASH_WORD_SIZE *)info->start[0];	addr[0] = (FLASH_WORD_SIZE)0x00F000F0;	/* 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){	volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *)(info->start[0]);	volatile FLASH_WORD_SIZE *dest2 = (FLASH_WORD_SIZE *)dest;	volatile FLASH_WORD_SIZE *data2 = (FLASH_WORD_SIZE *)&data;	ulong start;	int flag;	int i;	/* Check if Flash is (sufficiently) erased */	if ((*((volatile FLASH_WORD_SIZE *)dest) &	     (FLASH_WORD_SIZE)data) != (FLASH_WORD_SIZE)data) {		return (2);	}	/* Disable interrupts which might cause a timeout here */	flag = disable_interrupts();	for (i=0; i<4/sizeof(FLASH_WORD_SIZE); i++)	  {	    addr2[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;	    addr2[ADDR1] = (FLASH_WORD_SIZE)0x00550055;	    addr2[ADDR0] = (FLASH_WORD_SIZE)0x00A000A0;	    dest2[i] = data2[i];	    /* re-enable interrupts if necessary */	    if (flag)	      enable_interrupts();	    /* data polling for D7 */	    start = get_timer (0);	    while ((dest2[i] & (FLASH_WORD_SIZE)0x00800080) !=		   (data2[i] & (FLASH_WORD_SIZE)0x00800080)) {	      if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {		return (1);	      }	    }	  }	return (0);}/*----------------------------------------------------------------------- */