board/siemens/pcu_e/flash.c - filogic/uboot - Gitiles

 /*
  * (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 <mpc8xx.h>

 #if defined(CONFIG_ENV_IS_IN_FLASH)
 # ifndef  CONFIG_ENV_ADDR
 #  define CONFIG_ENV_ADDR	(CFG_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

 /*---------------------------------------------------------------------*/
 #undef DEBUG_FLASH

 #ifdef DEBUG_FLASH
 #define DEBUGF(fmt,args...) printf(fmt ,##args)
 #else
 #define DEBUGF(fmt,args...)
 #endif
 /*---------------------------------------------------------------------*/


 flash_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_data (flash_info_t *info, ulong dest, ulong data);
 static void flash_get_offsets (ulong base, flash_info_t *info);

 /*-----------------------------------------------------------------------
  *
  * The PCU E uses an address map where flash banks are aligned top
  * down, so that the "first" flash bank ends at top of memory, and
  * the monitor entry point is at address (0xFFF00100). The second
  * flash bank is mapped immediately below bank 0.
  *
  * This is NOT in conformance to the "official" memory map!
  *
  */

 #define PCU_MONITOR_BASE   ( (flash_info[0].start[0] + flash_info[0].size - 1) \
 			   - (0xFFFFFFFF - CFG_MONITOR_BASE) )

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

 unsigned long flash_init (void)
 {
 	volatile immap_t     *immap  = (immap_t *)CFG_IMMR;
 	volatile memctl8xx_t *memctl = &immap->im_memctl;
 	unsigned long base, 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 */

 	/*
 	 * Warning:
 	 *
 	 * Since the PCU E memory map assigns flash banks top down,
 	 * we swap the numbering later if both banks are equipped,
 	 * so they look like a contiguous area of memory.
 	 */
 	DEBUGF("\n## Get flash bank 1 size @ 0x%08x\n",FLASH_BASE0_PRELIM);

 	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);
 	}

 	DEBUGF("## Get flash bank 2 size @ 0x%08x\n",FLASH_BASE6_PRELIM);
 	size_b1 = flash_get_size((vu_long *)FLASH_BASE6_PRELIM, &flash_info[1]);

 	DEBUGF("## Prelim. Flash bank sizes: %08lx + 0x%08lx\n", size_b0, size_b1);

 	if (size_b1 > size_b0) {
 		printf ("## ERROR: "
 			"Bank 1 (0x%08lx = %ld MB) > Bank 0 (0x%08lx = %ld MB)\n",
 			size_b1, size_b1<<20,
 			size_b0, size_b0<<20
 		);
 		flash_info[0].flash_id	= FLASH_UNKNOWN;
 		flash_info[1].flash_id	= FLASH_UNKNOWN;
 		flash_info[0].sector_count	= -1;
 		flash_info[1].sector_count	= -1;
 		flash_info[0].size		= 0;
 		flash_info[1].size		= 0;
 		return (0);
 	}

 	DEBUGF ("## Before remap: "
 		"BR0: 0x%08x    OR0: 0x%08x    "
 		"BR6: 0x%08x    OR6: 0x%08x\n",
 		memctl->memc_br0, memctl->memc_or0,
 		memctl->memc_br6, memctl->memc_or6);

 	/* Remap FLASH according to real size */
 	base = 0 - size_b0;
 	memctl->memc_or0 = CFG_OR_TIMING_FLASH | (-size_b0 & 0xFFFF8000);
 	memctl->memc_br0 = (base & BR_BA_MSK) | BR_PS_16 | BR_MS_GPCM | BR_V;

 	DEBUGF("## BR0: 0x%08x    OR0: 0x%08x\n",
 		memctl->memc_br0, memctl->memc_or0);

 	/* Re-do sizing to get full correct info */
 	size_b0 = flash_get_size((vu_long *)base, &flash_info[0]);
 	base = 0 - size_b0;

 	flash_info[0].size = size_b0;

 	flash_get_offsets (base, &flash_info[0]);

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

 #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

 	if (size_b1) {
 		flash_info_t tmp_info;

 		memctl->memc_or6 = CFG_OR_TIMING_FLASH | (-size_b1 & 0xFFFF8000);
 		memctl->memc_br6 = ((base - size_b1) & BR_BA_MSK) |
 				    BR_PS_16 | BR_MS_GPCM | BR_V;

 		DEBUGF("## New BR6: 0x%08x    OR6: 0x%08x\n",
 			memctl->memc_br6, memctl->memc_or6);

 		/* Re-do sizing to get full correct info */
 		size_b1 = flash_get_size((vu_long *)(base - size_b1),
 					  &flash_info[1]);
 		base -= size_b1;

 		flash_get_offsets (base, &flash_info[1]);

 		flash_info[1].size = size_b1;

 #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[1]);
 #endif
 		/*
 		 * Swap bank numbers so that addresses are in ascending order
 		 */
 		tmp_info = flash_info[0];
 		flash_info[0] = flash_info[1];
 		flash_info[1] = tmp_info;
 	} else {
 		memctl->memc_br1 = 0;		/* invalidate bank */

 		flash_info[1].flash_id = FLASH_UNKNOWN;
 		flash_info[1].sector_count = -1;
 	}


 	DEBUGF("## Final Flash bank sizes: %08lx + 0x%08lx\n",size_b0,size_b1);

 	return (size_b0 + size_b1);
 }

 /*-----------------------------------------------------------------------
  */
 static void flash_get_offsets (ulong base, flash_info_t *info)
 {
 	int i;
 	short n;

 	if (info->flash_id == FLASH_UNKNOWN) {
 		return;
 	}

 	if ((info->flash_id & FLASH_VENDMASK) != FLASH_MAN_AMD) {
 		return;
 	}

 	switch (info->flash_id & FLASH_TYPEMASK) {
 	case FLASH_AMDL322T:
 	case FLASH_AMDL323T:
 	case FLASH_AMDL324T:
 		/* set sector offsets for top boot block type		*/

 		base += info->size;
 		i = info->sector_count;
 		for (n=0; n<8; ++n) {		/*  8 x 8k boot sectors	*/
 			base -= 8 << 10;
 			--i;
 			info->start[i] = base;
 		}
 		while (i > 0) {			/* 64k regular sectors	*/
 			base -= 64 << 10;
 			--i;
 			info->start[i] = base;
 		}
 		return;
 	case FLASH_AMDL322B:
 	case FLASH_AMDL323B:
 	case FLASH_AMDL324B:
 		/* set sector offsets for bottom boot block type	*/
 		for (i=0; i<8; ++i) {		/*  8 x 8k boot sectors	*/
 			info->start[i] = base;
 			base += 8 << 10;
 		}
 		while (base < info->size) {	/* 64k regular sectors	*/
 			info->start[i] = base;
 			base += 64 << 10;
 			++i;
 		}
 		return;
 	case FLASH_AMDL640:
 		/* set sector offsets for dual boot block type		*/
 		for (i=0; i<8; ++i) {		/*  8 x 8k boot sectors	*/
 			info->start[i] = base;
 			base += 8 << 10;
 		}
 		n = info->sector_count - 8;
 		while (i < n) {			/* 64k regular sectors	*/
 			info->start[i] = base;
 			base += 64 << 10;
 			++i;
 		}
 		while (i < info->sector_count) { /* 8 x 8k boot sectors	*/
 			info->start[i] = base;
 			base += 8 << 10;
 			++i;
 		}
 		return;
 	default:
 		return;
 	}
 	/* NOTREACHED */
 }

 /*-----------------------------------------------------------------------
  */
 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_AMD:	printf ("AMD ");		break;
 	case FLASH_MAN_FUJ:	printf ("FUJITSU ");		break;
 	default:		printf ("Unknown Vendor ");	break;
 	}

 	switch (info->flash_id & FLASH_TYPEMASK) {
 	case FLASH_AMDL322B:	printf ("AM29DL322B (32 Mbit, bottom boot sect)\n");
 				break;
 	case FLASH_AMDL322T:	printf ("AM29DL322T (32 Mbit, top boot sector)\n");
 				break;
 	case FLASH_AMDL323B:	printf ("AM29DL323B (32 Mbit, bottom boot sect)\n");
 				break;
 	case FLASH_AMDL323T:	printf ("AM29DL323T (32 Mbit, top boot sector)\n");
 				break;
 	case FLASH_AMDL324B:	printf ("AM29DL324B (32 Mbit, bottom boot sect)\n");
 				break;
 	case FLASH_AMDL324T:	printf ("AM29DL324T (32 Mbit, top boot sector)\n");
 				break;
 	case FLASH_AMDL640:	printf ("AM29DL640D (64 Mbit, dual boot sector)\n");
 				break;
 	default:		printf ("Unknown Chip Type 0x%lX\n",
 					info->flash_id);
 				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;
 	ushort value;
 	vu_short *saddr = (vu_short *)addr;

 	/* Write auto select command: read Manufacturer ID */
 	saddr[0x0555] = 0x00AA;
 	saddr[0x02AA] = 0x0055;
 	saddr[0x0555] = 0x0090;

 	value = saddr[0];

 	DEBUGF("Manuf. ID @ 0x%08lx: 0x%04x\n", (ulong)addr, value);

 	switch (value) {
 	case (AMD_MANUFACT & 0xFFFF):
 		info->flash_id = FLASH_MAN_AMD;
 		break;
 	case (FUJ_MANUFACT & 0xFFFF):
 		info->flash_id = FLASH_MAN_FUJ;
 		break;
 	default:
 		DEBUGF("Unknown Manufacturer ID\n");
 		info->flash_id = FLASH_UNKNOWN;
 		info->sector_count = 0;
 		info->size = 0;
 		return (0);			/* no or unknown flash	*/
 	}

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

 	DEBUGF("Device ID @ 0x%08lx: 0x%04x\n", (ulong)(&addr[1]), value);

 	switch (value) {

 	case (AMD_ID_DL322T & 0xFFFF):
 		info->flash_id += FLASH_AMDL322T;
 		info->sector_count = 71;
 		info->size = 0x00400000;
 		break;				/* => 8 MB		*/

 	case (AMD_ID_DL322B & 0xFFFF):
 		info->flash_id += FLASH_AMDL322B;
 		info->sector_count = 71;
 		info->size = 0x00400000;
 		break;				/* => 8 MB		*/

 	case (AMD_ID_DL323T & 0xFFFF):
 		info->flash_id += FLASH_AMDL323T;
 		info->sector_count = 71;
 		info->size = 0x00400000;
 		break;				/* => 8 MB		*/

 	case (AMD_ID_DL323B & 0xFFFF):
 		info->flash_id += FLASH_AMDL323B;
 		info->sector_count = 71;
 		info->size = 0x00400000;
 		break;				/* => 8 MB		*/

 	case (AMD_ID_DL324T & 0xFFFF):
 		info->flash_id += FLASH_AMDL324T;
 		info->sector_count = 71;
 		info->size = 0x00400000;
 		break;				/* => 8 MB		*/

 	case (AMD_ID_DL324B & 0xFFFF):
 		info->flash_id += FLASH_AMDL324B;
 		info->sector_count = 71;
 		info->size = 0x00400000;
 		break;				/* => 8 MB		*/
 	case (AMD_ID_DL640  & 0xFFFF):
 		info->flash_id += FLASH_AMDL640;
 		info->sector_count = 142;
 		info->size = 0x00800000;
 		break;
 	default:
 		DEBUGF("Unknown Device ID\n");
 		info->flash_id = FLASH_UNKNOWN;
 		return (0);			/* => no or unknown flash */

 	}

 	flash_get_offsets ((ulong)addr, info);

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

 	if (info->sector_count > CFG_MAX_FLASH_SECT) {
 		printf ("** ERROR: sector count %d > max (%d) **\n",
 			info->sector_count, CFG_MAX_FLASH_SECT);
 		info->sector_count = CFG_MAX_FLASH_SECT;
 	}

 	saddr = (vu_short *)info->start[0];
 	*saddr = 0x00F0;	/* restore read mode */

 	return (info->size);
 }


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

 int	flash_erase (flash_info_t *info, int s_first, int s_last)
 {
 	vu_short *addr = (vu_short*)(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;
 	}

 	if ((info->flash_id == FLASH_UNKNOWN) ||
 	    (info->flash_id > FLASH_AMD_COMP)) {
 		printf ("Can't erase unknown flash type %08lx - 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 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] = 0x00AA;
 	addr[0x02AA] = 0x0055;
 	addr[0x0555] = 0x0080;
 	addr[0x0555] = 0x00AA;
 	addr[0x02AA] = 0x0055;

 	/* Start erase on unprotected sectors */
 	for (sect = s_first; sect<=s_last; sect++) {
 		if (info->protect[sect] == 0) {	/* not protected */
 			addr = (vu_short*)(info->start[sect]);
 			addr[0] = 0x0030;
 			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_short*)(info->start[l_sect]);
 	while ((addr[0] & 0x0080) != 0x0080) {
 		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;
 		}
 	}

 DONE:
 	/* reset to read mode */
 	addr = (vu_short *)info->start[0];
 	addr[0] = 0x00F0;	/* reset bank */

 	printf (" done\n");
 	return 0;
 }

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

 #define FLASH_WIDTH	2	/* flash bus width in bytes */

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

 	wp = (addr & ~(FLASH_WIDTH-1));	/* get lower FLASH_WIDTH 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<FLASH_WIDTH && cnt>0; ++i) {
 			data = (data << 8) | *src++;
 			--cnt;
 			++cp;
 		}
 		for (; cnt==0 && i<FLASH_WIDTH; ++i, ++cp) {
 			data = (data << 8) | (*(uchar *)cp);
 		}

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

 	/*
 	 * handle FLASH_WIDTH aligned part
 	 */
 	while (cnt >= FLASH_WIDTH) {
 		data = 0;
 		for (i=0; i<FLASH_WIDTH; ++i) {
 			data = (data << 8) | *src++;
 		}
 		if ((rc = write_data(info, wp, data)) != 0) {
 			return (rc);
 		}
 		wp  += FLASH_WIDTH;
 		cnt -= FLASH_WIDTH;
 	}

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

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

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

 /*-----------------------------------------------------------------------
  * Write a word to Flash, returns:
  * 0 - OK
  * 1 - write timeout
  * 2 - Flash not erased
  */
 static int write_data (flash_info_t *info, ulong dest, ulong data)
 {
 	vu_short *addr  = (vu_short*)(info->start[0]);
 	vu_short *sdest = (vu_short *)dest;
 	ushort sdata = (ushort)data;
 	ushort sval;
 	ulong start, passed;
 	int flag, rc;

 	/* Check if Flash is (sufficiently) erased */
 	if ((*sdest & sdata) != sdata) {
 		return (2);
 	}
 	/* Disable interrupts which might cause a timeout here */
 	flag = disable_interrupts();

 	addr[0x0555] = 0x00AA;
 	addr[0x02AA] = 0x0055;
 	addr[0x0555] = 0x00A0;

 #ifdef WORKAROUND_FOR_BROKEN_HARDWARE
 	/* work around the timeout bugs */
 	udelay(20);
 #endif

 	*sdest = sdata;

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

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

 	for (passed=0; passed < CFG_FLASH_WRITE_TOUT; passed=get_timer(start)) {

 		sval = *sdest;

 		if ((sval & 0x0080) == (sdata & 0x0080))
 			break;

 		if ((sval & 0x0020) == 0)	/* DQ5: Timeout? */
 			continue;

 		sval = *sdest;

 		if ((sval & 0x0080) != (sdata & 0x0080))
 			rc = 1;

 		break;
 	}

 	if (rc) {
 	    DEBUGF ("Program cycle failed @ addr 0x%08lX: val %04X data %04X\n",
 		 dest, sval, sdata);
 	}

 	if (passed >= CFG_FLASH_WRITE_TOUT) {
 		DEBUGF ("Timeout @ addr 0x%08lX: val %04X data %04X\n",
 			dest, sval, sdata);
 		rc = 1;
 	}

 	/* reset to read mode */
 	addr = (vu_short *)info->start[0];
 	addr[0] = 0x00F0;	/* reset bank */

 	return (rc);
 }

 /*-----------------------------------------------------------------------
  */
	/*
	* (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 <mpc8xx.h>

	#if defined(CONFIG_ENV_IS_IN_FLASH)
	# ifndef CONFIG_ENV_ADDR
	# define CONFIG_ENV_ADDR (CFG_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

	/---------------------------------------------------------------------/
	#undef DEBUG_FLASH

	#ifdef DEBUG_FLASH
	#define DEBUGF(fmt,args...) printf(fmt ,##args)
	#else
	#define DEBUGF(fmt,args...)
	#endif
	/---------------------------------------------------------------------/


	flash_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_data (flash_info_t *info, ulong dest, ulong data);
	static void flash_get_offsets (ulong base, flash_info_t *info);

	/*-----------------------------------------------------------------------
	*
	* The PCU E uses an address map where flash banks are aligned top
	* down, so that the "first" flash bank ends at top of memory, and
	* the monitor entry point is at address (0xFFF00100). The second
	* flash bank is mapped immediately below bank 0.
	*
	* This is NOT in conformance to the "official" memory map!
	*
	*/

	#define PCU_MONITOR_BASE ( (flash_info[0].start[0] + flash_info[0].size - 1) \
	- (0xFFFFFFFF - CFG_MONITOR_BASE) )

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

	unsigned long flash_init (void)
	{
	volatile immap_t immap = (immap_t )CFG_IMMR;
	volatile memctl8xx_t *memctl = &immap->im_memctl;
	unsigned long base, 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 */

	/*
	* Warning:
	*
	* Since the PCU E memory map assigns flash banks top down,
	* we swap the numbering later if both banks are equipped,
	* so they look like a contiguous area of memory.
	*/
	DEBUGF("\n## Get flash bank 1 size @ 0x%08x\n",FLASH_BASE0_PRELIM);

	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);
	}

	DEBUGF("## Get flash bank 2 size @ 0x%08x\n",FLASH_BASE6_PRELIM);
	size_b1 = flash_get_size((vu_long *)FLASH_BASE6_PRELIM, &flash_info[1]);

	DEBUGF("## Prelim. Flash bank sizes: %08lx + 0x%08lx\n", size_b0, size_b1);

	if (size_b1 > size_b0) {
	printf ("## ERROR: "
	"Bank 1 (0x%08lx = %ld MB) > Bank 0 (0x%08lx = %ld MB)\n",
	size_b1, size_b1<<20,
	size_b0, size_b0<<20
	);
	flash_info[0].flash_id = FLASH_UNKNOWN;
	flash_info[1].flash_id = FLASH_UNKNOWN;
	flash_info[0].sector_count = -1;
	flash_info[1].sector_count = -1;
	flash_info[0].size = 0;
	flash_info[1].size = 0;
	return (0);
	}

	DEBUGF ("## Before remap: "
	"BR0: 0x%08x OR0: 0x%08x "
	"BR6: 0x%08x OR6: 0x%08x\n",
	memctl->memc_br0, memctl->memc_or0,
	memctl->memc_br6, memctl->memc_or6);

	/* Remap FLASH according to real size */
	base = 0 - size_b0;
	memctl->memc_or0 = CFG_OR_TIMING_FLASH \| (-size_b0 & 0xFFFF8000);
	memctl->memc_br0 = (base & BR_BA_MSK) \| BR_PS_16 \| BR_MS_GPCM \| BR_V;

	DEBUGF("## BR0: 0x%08x OR0: 0x%08x\n",
	memctl->memc_br0, memctl->memc_or0);

	/* Re-do sizing to get full correct info */
	size_b0 = flash_get_size((vu_long *)base, &flash_info[0]);
	base = 0 - size_b0;

	flash_info[0].size = size_b0;

	flash_get_offsets (base, &flash_info[0]);

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

	#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

	if (size_b1) {
	flash_info_t tmp_info;

	memctl->memc_or6 = CFG_OR_TIMING_FLASH \| (-size_b1 & 0xFFFF8000);
	memctl->memc_br6 = ((base - size_b1) & BR_BA_MSK) \|
	BR_PS_16 \| BR_MS_GPCM \| BR_V;

	DEBUGF("## New BR6: 0x%08x OR6: 0x%08x\n",
	memctl->memc_br6, memctl->memc_or6);

	/* Re-do sizing to get full correct info */
	size_b1 = flash_get_size((vu_long *)(base - size_b1),
	&flash_info[1]);
	base -= size_b1;

	flash_get_offsets (base, &flash_info[1]);

	flash_info[1].size = size_b1;

	#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[1]);
	#endif
	/*
	* Swap bank numbers so that addresses are in ascending order
	*/
	tmp_info = flash_info[0];
	flash_info[0] = flash_info[1];
	flash_info[1] = tmp_info;
	} else {
	memctl->memc_br1 = 0; /* invalidate bank */

	flash_info[1].flash_id = FLASH_UNKNOWN;
	flash_info[1].sector_count = -1;
	}


	DEBUGF("## Final Flash bank sizes: %08lx + 0x%08lx\n",size_b0,size_b1);

	return (size_b0 + size_b1);
	}

	/*-----------------------------------------------------------------------
	*/
	static void flash_get_offsets (ulong base, flash_info_t *info)
	{
	int i;
	short n;

	if (info->flash_id == FLASH_UNKNOWN) {
	return;
	}

	if ((info->flash_id & FLASH_VENDMASK) != FLASH_MAN_AMD) {
	return;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_AMDL322T:
	case FLASH_AMDL323T:
	case FLASH_AMDL324T:
	/* set sector offsets for top boot block type */

	base += info->size;
	i = info->sector_count;
	for (n=0; n<8; ++n) { /* 8 x 8k boot sectors */
	base -= 8 << 10;
	--i;
	info->start[i] = base;
	}
	while (i > 0) { /* 64k regular sectors */
	base -= 64 << 10;
	--i;
	info->start[i] = base;
	}
	return;
	case FLASH_AMDL322B:
	case FLASH_AMDL323B:
	case FLASH_AMDL324B:
	/* set sector offsets for bottom boot block type */
	for (i=0; i<8; ++i) { /* 8 x 8k boot sectors */
	info->start[i] = base;
	base += 8 << 10;
	}
	while (base < info->size) { /* 64k regular sectors */
	info->start[i] = base;
	base += 64 << 10;
	++i;
	}
	return;
	case FLASH_AMDL640:
	/* set sector offsets for dual boot block type */
	for (i=0; i<8; ++i) { /* 8 x 8k boot sectors */
	info->start[i] = base;
	base += 8 << 10;
	}
	n = info->sector_count - 8;
	while (i < n) { /* 64k regular sectors */
	info->start[i] = base;
	base += 64 << 10;
	++i;
	}
	while (i < info->sector_count) { /* 8 x 8k boot sectors */
	info->start[i] = base;
	base += 8 << 10;
	++i;
	}
	return;
	default:
	return;
	}
	/* NOTREACHED */
	}

	/*-----------------------------------------------------------------------
	*/
	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_AMD: printf ("AMD "); break;
	case FLASH_MAN_FUJ: printf ("FUJITSU "); break;
	default: printf ("Unknown Vendor "); break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_AMDL322B: printf ("AM29DL322B (32 Mbit, bottom boot sect)\n");
	break;
	case FLASH_AMDL322T: printf ("AM29DL322T (32 Mbit, top boot sector)\n");
	break;
	case FLASH_AMDL323B: printf ("AM29DL323B (32 Mbit, bottom boot sect)\n");
	break;
	case FLASH_AMDL323T: printf ("AM29DL323T (32 Mbit, top boot sector)\n");
	break;
	case FLASH_AMDL324B: printf ("AM29DL324B (32 Mbit, bottom boot sect)\n");
	break;
	case FLASH_AMDL324T: printf ("AM29DL324T (32 Mbit, top boot sector)\n");
	break;
	case FLASH_AMDL640: printf ("AM29DL640D (64 Mbit, dual boot sector)\n");
	break;
	default: printf ("Unknown Chip Type 0x%lX\n",
	info->flash_id);
	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;
	ushort value;
	vu_short saddr = (vu_short )addr;

	/* Write auto select command: read Manufacturer ID */
	saddr[0x0555] = 0x00AA;
	saddr[0x02AA] = 0x0055;
	saddr[0x0555] = 0x0090;

	value = saddr[0];

	DEBUGF("Manuf. ID @ 0x%08lx: 0x%04x\n", (ulong)addr, value);

	switch (value) {
	case (AMD_MANUFACT & 0xFFFF):
	info->flash_id = FLASH_MAN_AMD;
	break;
	case (FUJ_MANUFACT & 0xFFFF):
	info->flash_id = FLASH_MAN_FUJ;
	break;
	default:
	DEBUGF("Unknown Manufacturer ID\n");
	info->flash_id = FLASH_UNKNOWN;
	info->sector_count = 0;
	info->size = 0;
	return (0); /* no or unknown flash */
	}

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

	DEBUGF("Device ID @ 0x%08lx: 0x%04x\n", (ulong)(&addr[1]), value);

	switch (value) {

	case (AMD_ID_DL322T & 0xFFFF):
	info->flash_id += FLASH_AMDL322T;
	info->sector_count = 71;
	info->size = 0x00400000;
	break; /* => 8 MB */

	case (AMD_ID_DL322B & 0xFFFF):
	info->flash_id += FLASH_AMDL322B;
	info->sector_count = 71;
	info->size = 0x00400000;
	break; /* => 8 MB */

	case (AMD_ID_DL323T & 0xFFFF):
	info->flash_id += FLASH_AMDL323T;
	info->sector_count = 71;
	info->size = 0x00400000;
	break; /* => 8 MB */

	case (AMD_ID_DL323B & 0xFFFF):
	info->flash_id += FLASH_AMDL323B;
	info->sector_count = 71;
	info->size = 0x00400000;
	break; /* => 8 MB */

	case (AMD_ID_DL324T & 0xFFFF):
	info->flash_id += FLASH_AMDL324T;
	info->sector_count = 71;
	info->size = 0x00400000;
	break; /* => 8 MB */

	case (AMD_ID_DL324B & 0xFFFF):
	info->flash_id += FLASH_AMDL324B;
	info->sector_count = 71;
	info->size = 0x00400000;
	break; /* => 8 MB */
	case (AMD_ID_DL640 & 0xFFFF):
	info->flash_id += FLASH_AMDL640;
	info->sector_count = 142;
	info->size = 0x00800000;
	break;
	default:
	DEBUGF("Unknown Device ID\n");
	info->flash_id = FLASH_UNKNOWN;
	return (0); /* => no or unknown flash */

	}

	flash_get_offsets ((ulong)addr, info);

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

	if (info->sector_count > CFG_MAX_FLASH_SECT) {
	printf (" ERROR: sector count %d > max (%d) \n",
	info->sector_count, CFG_MAX_FLASH_SECT);
	info->sector_count = CFG_MAX_FLASH_SECT;
	}

	saddr = (vu_short *)info->start[0];
	saddr = 0x00F0; / restore read mode */

	return (info->size);
	}


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

	int flash_erase (flash_info_t *info, int s_first, int s_last)
	{
	vu_short addr = (vu_short)(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;
	}

	if ((info->flash_id == FLASH_UNKNOWN) \|\|
	(info->flash_id > FLASH_AMD_COMP)) {
	printf ("Can't erase unknown flash type %08lx - 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 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] = 0x00AA;
	addr[0x02AA] = 0x0055;
	addr[0x0555] = 0x0080;
	addr[0x0555] = 0x00AA;
	addr[0x02AA] = 0x0055;

	/* Start erase on unprotected sectors */
	for (sect = s_first; sect<=s_last; sect++) {
	if (info->protect[sect] == 0) { /* not protected */
	addr = (vu_short*)(info->start[sect]);
	addr[0] = 0x0030;
	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_short*)(info->start[l_sect]);
	while ((addr[0] & 0x0080) != 0x0080) {
	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;
	}
	}

	DONE:
	/* reset to read mode */
	addr = (vu_short *)info->start[0];
	addr[0] = 0x00F0; /* reset bank */

	printf (" done\n");
	return 0;
	}

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

	#define FLASH_WIDTH 2 /* flash bus width in bytes */

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

	wp = (addr & ~(FLASH_WIDTH-1)); /* get lower FLASH_WIDTH 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<FLASH_WIDTH && cnt>0; ++i) {
	data = (data << 8) \| *src++;
	--cnt;
	++cp;
	}
	for (; cnt==0 && i<FLASH_WIDTH; ++i, ++cp) {
	data = (data << 8) \| ((uchar )cp);
	}

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

	/*
	* handle FLASH_WIDTH aligned part
	*/
	while (cnt >= FLASH_WIDTH) {
	data = 0;
	for (i=0; i<FLASH_WIDTH; ++i) {
	data = (data << 8) \| *src++;
	}
	if ((rc = write_data(info, wp, data)) != 0) {
	return (rc);
	}
	wp += FLASH_WIDTH;
	cnt -= FLASH_WIDTH;
	}

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

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

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

	/*-----------------------------------------------------------------------
	* Write a word to Flash, returns:
	* 0 - OK
	* 1 - write timeout
	* 2 - Flash not erased
	*/
	static int write_data (flash_info_t *info, ulong dest, ulong data)
	{
	vu_short addr = (vu_short)(info->start[0]);
	vu_short sdest = (vu_short )dest;
	ushort sdata = (ushort)data;
	ushort sval;
	ulong start, passed;
	int flag, rc;

	/* Check if Flash is (sufficiently) erased */
	if ((*sdest & sdata) != sdata) {
	return (2);
	}
	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts();

	addr[0x0555] = 0x00AA;
	addr[0x02AA] = 0x0055;
	addr[0x0555] = 0x00A0;

	#ifdef WORKAROUND_FOR_BROKEN_HARDWARE
	/* work around the timeout bugs */
	udelay(20);
	#endif

	*sdest = sdata;

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

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

	for (passed=0; passed < CFG_FLASH_WRITE_TOUT; passed=get_timer(start)) {

	sval = *sdest;

	if ((sval & 0x0080) == (sdata & 0x0080))
	break;

	if ((sval & 0x0020) == 0) /* DQ5: Timeout? */
	continue;

	sval = *sdest;

	if ((sval & 0x0080) != (sdata & 0x0080))
	rc = 1;

	break;
	}

	if (rc) {
	DEBUGF ("Program cycle failed @ addr 0x%08lX: val %04X data %04X\n",
	dest, sval, sdata);
	}

	if (passed >= CFG_FLASH_WRITE_TOUT) {
	DEBUGF ("Timeout @ addr 0x%08lX: val %04X data %04X\n",
	dest, sval, sdata);
	rc = 1;
	}

	/* reset to read mode */
	addr = (vu_short *)info->start[0];
	addr[0] = 0x00F0; /* reset bank */

	return (rc);
	}

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