[people/ms/u-boot.git] / board / mpc8560ads / flash.c

/*
 * (C) Copyright 2003 Motorola Inc.
 *  Xianghua Xiao,(X.Xiao@motorola.com)
 *
 * (C) Copyright 2000, 2001
 *  Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * (C) Copyright 2001, Stuart Hughes, Lineo Inc, stuarth@lineo.com
 * Add support the Sharp chips on the mpc8260ads.
 * I started with board/ip860/flash.c and made changes I found in
 * the MTD project by David Schleef.
 *
 * 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>

#if !defined(CFG_NO_FLASH)

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

#if defined(CFG_ENV_IS_IN_FLASH)
# ifndef  CFG_ENV_ADDR
#  define CFG_ENV_ADDR	(CFG_FLASH_BASE + CFG_ENV_OFFSET)
# endif
# ifndef  CFG_ENV_SIZE
#  define CFG_ENV_SIZE	CFG_ENV_SECT_SIZE
# endif
# ifndef  CFG_ENV_SECT_SIZE
#  define CFG_ENV_SECT_SIZE  CFG_ENV_SIZE
# endif
#endif

#undef DEBUG

/*-----------------------------------------------------------------------
 * 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 int clear_block_lock_bit(vu_long * addr);
/*-----------------------------------------------------------------------
 */

unsigned long flash_init (void)
{
	unsigned long size;
	int i;

	/* Init: enable write,
	 * or we cannot even write flash commands
	 */
	for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
		flash_info[i].flash_id = FLASH_UNKNOWN;

		/* set the default sector offset */
	}

	/* Static FLASH Bank configuration here - FIXME XXX */

	size = flash_get_size((vu_long *)CFG_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, size<<20);
	}

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

	flash_info[0].size = size;

#if CFG_MONITOR_BASE >= CFG_FLASH_BASE
	/* monitor protection ON by default */
	flash_protect(FLAG_PROTECT_SET,
		      CFG_MONITOR_BASE,
		      CFG_MONITOR_BASE+monitor_flash_len-1,
		      &flash_info[0]);

#ifdef	CFG_ENV_IS_IN_FLASH
	/* ENV protection ON by default */
	flash_protect(FLAG_PROTECT_SET,
		      CFG_ENV_ADDR,
		      CFG_ENV_ADDR+CFG_ENV_SECT_SIZE-1,
		      &flash_info[0]);
#endif
#endif
	return (size);
}

/*-----------------------------------------------------------------------
 */
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_INTEL:	printf ("Intel ");		break;
	case FLASH_MAN_SHARP:   printf ("Sharp ");		break;
	default:		printf ("Unknown Vendor ");	break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_28F016SV:	printf ("28F016SV (16 Mbit, 32 x 64k)\n");
				break;
	case FLASH_28F160S3:	printf ("28F160S3 (16 Mbit, 32 x 512K)\n");
				break;
	case FLASH_28F320S3:	printf ("28F320S3 (32 Mbit, 64 x 512K)\n");
				break;
	case FLASH_LH28F016SCT: printf ("28F016SC (16 Mbit, 32 x 64K)\n");
				break;
	case FLASH_28F640J3A:   printf ("28F640J3A (64 Mbit, 64 x 128K)\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");
}

/*
 * The following code cannot be run from FLASH!
 */

static ulong flash_get_size (vu_long *addr, flash_info_t *info)
{
	short i;
	ulong value;
	ulong base = (ulong)addr;
	ulong sector_offset;

#ifdef DEBUG
	printf("Check flash at 0x%08x\n",(uint)addr);
#endif
	/* Write "Intelligent Identifier" command: read Manufacturer ID */
	*addr = 0x90909090;
	udelay(20);
	asm("sync");

	value = addr[0] & 0x00FF00FF;

#ifdef DEBUG
	printf("manufacturer=0x%x\n",(uint)value);
#endif
	switch (value) {
	case MT_MANUFACT:	/* SHARP, MT or => Intel */
	case INTEL_ALT_MANU:
		info->flash_id = FLASH_MAN_INTEL;
		break;
	default:
		printf("unknown manufacturer: %x\n", (unsigned int)value);
		info->flash_id = FLASH_UNKNOWN;
		info->sector_count = 0;
		info->size = 0;
		return (0);			/* no or unknown flash	*/
	}

	value = addr[1] & 0x00FF00FF;             /* device ID            */

#ifdef DEBUG
	printf("deviceID=0x%x\n",(uint)value);
#endif
	switch (value) {
	case (INTEL_ID_28F016S):
		info->flash_id += FLASH_28F016SV;
		info->sector_count = 32;
		info->size = 0x00400000;
		sector_offset = 0x20000;
		break;				/* => 2x2 MB		*/

	case (INTEL_ID_28F160S3):
		info->flash_id += FLASH_28F160S3;
		info->sector_count = 32;
		info->size = 0x00400000;
		sector_offset = 0x20000;
		break;				/* => 2x2 MB		*/

	case (INTEL_ID_28F320S3):
		info->flash_id += FLASH_28F320S3;
		info->sector_count = 64;
		info->size = 0x00800000;
		sector_offset = 0x20000;
		break;				/* => 2x4 MB		*/

	case (INTEL_ID_28F640J3A):
		info->flash_id += FLASH_28F640J3A;
		info->sector_count = 64;
		info->size = 0x01000000;
		sector_offset = 0x40000;
		break;                          /* => 8 MB             */

	case SHARP_ID_28F016SCL:
	case SHARP_ID_28F016SCZ:
		info->flash_id      = FLASH_MAN_SHARP | FLASH_LH28F016SCT;
		info->sector_count  = 32;
		info->size          = 0x00800000;
		sector_offset = 0x40000;
		break;				/* => 4x2 MB		*/


	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;
		base += sector_offset;
		/* don't know how to check sector protection */
		info->protect[i] = 0;
	}

	/*
	 * Prevent writes to uninitialized FLASH.
	 */
	if (info->flash_id != FLASH_UNKNOWN) {
		addr = (vu_long *)info->start[0];
		*addr = 0xFFFFFF;	/* reset bank to read array mode */
		asm("sync");
	}

	return (info->size);
}


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

int	flash_erase (flash_info_t *info, int s_first, int s_last)
{
	int flag, prot, 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_VENDMASK) != FLASH_MAN_INTEL)
	     && ((info->flash_id & FLASH_VENDMASK) != FLASH_MAN_SHARP) ) {
		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");
	}

#ifdef DEBUG
	printf("\nFlash Erase:\n");
#endif
	/* Make Sure Block Lock Bit is not set. */
	if(clear_block_lock_bit((vu_long *)(info->start[s_first]))){
		return 1;
	}

	/* Start erase on unprotected sectors */
#if defined(DEBUG)
	printf("Begin to erase now,s_first=0x%x s_last=0x%x...\n",s_first,s_last);
#endif
	for (sect = s_first; sect<=s_last; sect++) {
		if (info->protect[sect] == 0) {	/* not protected */
			vu_long *addr = (vu_long *)(info->start[sect]);
			asm("sync");

			last = start = get_timer (0);

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

			/* Reset Array */
			*addr = 0xffffffff;
			asm("sync");
			/* Clear Status Register */
			*addr = 0x50505050;
			asm("sync");
			/* Single Block Erase Command */
			*addr = 0x20202020;
			asm("sync");
			/* Confirm */
			*addr = 0xD0D0D0D0;
			asm("sync");

			if((info->flash_id & FLASH_TYPEMASK) != FLASH_LH28F016SCT) {
			    /* Resume Command, as per errata update */
			    *addr = 0xD0D0D0D0;
			    asm("sync");
			}

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

			/* wait at least 80us - let's wait 1 ms */
			udelay (1000);
			while ((*addr & 0x00800080) != 0x00800080) {
				if(*addr & 0x00200020){
					printf("Error in Block Erase - Lock Bit may be set!\n");
					printf("Status Register = 0x%X\n", (uint)*addr);
					*addr = 0xFFFFFFFF;	/* reset bank */
					asm("sync");
					return 1;
				}
				if ((now=get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
					printf ("Timeout\n");
					*addr = 0xFFFFFFFF;	/* reset bank */
					asm("sync");
					return 1;
				}
				/* show that we're waiting */
				if ((now - last) > 1000) {	/* every second */
					putc ('.');
					last = now;
				}
			}

			/* reset to read mode */
			*addr = 0xFFFFFFFF;
			asm("sync");
		}
	}

	printf ("flash erase 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 *)dest;
	ulong start, csr;
	int flag;

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

	/* Write Command */
	*addr = 0x10101010;
	asm("sync");

	/* Write Data */
	*addr = data;

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

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

	while (((csr = *addr) & 0x00800080) != 0x00800080) {
		if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
			flag = 1;
			break;
		}
	}
	if (csr & 0x40404040) {
		printf ("CSR indicates write error (%08lx) at %08lx\n", csr, (ulong)addr);
		flag = 1;
	}

	/* Clear Status Registers Command */
	*addr = 0x50505050;
	asm("sync");
	/* Reset to read array mode */
	*addr = 0xFFFFFFFF;
	asm("sync");

	return (flag);
}

/*-----------------------------------------------------------------------
 * Clear Block Lock Bit, returns:
 * 0 - OK
 * 1 - Timeout
 */

static int clear_block_lock_bit(vu_long  * addr)
{
	ulong start, now;

	/* Reset Array */
	*addr = 0xffffffff;
	asm("sync");
	/* Clear Status Register */
	*addr = 0x50505050;
	asm("sync");

	*addr = 0x60606060;
	asm("sync");
	*addr = 0xd0d0d0d0;
	asm("sync");

	start = get_timer (0);
	while((*addr & 0x00800080) != 0x00800080){
		if ((now=get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
			printf ("Timeout on clearing Block Lock Bit\n");
			*addr = 0xFFFFFFFF;	/* reset bank */
			asm("sync");
			return 1;
		}
	}
	return 0;
}

#endif /* !CFG_NO_FLASH */
Commit	Line	Data
42d1f039 WD	1	/*
	2	* (C) Copyright 2003 Motorola Inc.
	3	* Xianghua Xiao,(X.Xiao@motorola.com)
	4	*
	5	* (C) Copyright 2000, 2001
	6	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	7	*
	8	* (C) Copyright 2001, Stuart Hughes, Lineo Inc, stuarth@lineo.com
	9	* Add support the Sharp chips on the mpc8260ads.
	10	* I started with board/ip860/flash.c and made changes I found in
	11	* the MTD project by David Schleef.
	12	*
	13	* See file CREDITS for list of people who contributed to this
	14	* project.
	15	*
	16	* This program is free software; you can redistribute it and/or
	17	* modify it under the terms of the GNU General Public License as
	18	* published by the Free Software Foundation; either version 2 of
	19	* the License, or (at your option) any later version.
	20	*
	21	* This program is distributed in the hope that it will be useful,
	22	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	23	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	24	* GNU General Public License for more details.
	25	*
	26	* You should have received a copy of the GNU General Public License
	27	* along with this program; if not, write to the Free Software
	28	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	29	* MA 02111-1307 USA
	30	*/
	31
	32	#include <common.h>
	33
	34	#if !defined(CFG_NO_FLASH)
	35
	36	flash_info_t flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips */
	37
	38	#if defined(CFG_ENV_IS_IN_FLASH)
	39	# ifndef CFG_ENV_ADDR
	40	# define CFG_ENV_ADDR (CFG_FLASH_BASE + CFG_ENV_OFFSET)
	41	# endif
	42	# ifndef CFG_ENV_SIZE
	43	# define CFG_ENV_SIZE CFG_ENV_SECT_SIZE
	44	# endif
	45	# ifndef CFG_ENV_SECT_SIZE
	46	# define CFG_ENV_SECT_SIZE CFG_ENV_SIZE
	47	# endif
	48	#endif
	49
	50	#undef DEBUG
	51
	52	/*-----------------------------------------------------------------------
	53	* Functions
	54	*/
	55	static ulong flash_get_size (vu_long addr, flash_info_t info);
	56	static int write_word (flash_info_t *info, ulong dest, ulong data);
	57	static int clear_block_lock_bit(vu_long * addr);
	58	/*-----------------------------------------------------------------------
	59	*/
	60
	61	unsigned long flash_init (void)
	62	{
	63	unsigned long size;
	64	int i;
65
66	/* Init: enable write,
67	* or we cannot even write flash commands
68	*/
69	for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
70	flash_info[i].flash_id = FLASH_UNKNOWN;
71
72	/* set the default sector offset */
73	}
74
75	/* Static FLASH Bank configuration here - FIXME XXX */
76
77	size = flash_get_size((vu_long *)CFG_FLASH_BASE, &flash_info[0]);
78
79	if (flash_info[0].flash_id == FLASH_UNKNOWN) {
80	printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
81	size, size<<20);
82	}
83
84	/* Re-do sizing to get full correct info */
85	size = flash_get_size((vu_long *)CFG_FLASH_BASE, &flash_info[0]);
86
87	flash_info[0].size = size;
88
42d1f039 WD	89	#if CFG_MONITOR_BASE >= CFG_FLASH_BASE
	90	/* monitor protection ON by default */
	91	flash_protect(FLAG_PROTECT_SET,
	92	CFG_MONITOR_BASE,
	93	CFG_MONITOR_BASE+monitor_flash_len-1,
	94	&flash_info[0]);
42d1f039 WD	95
	96	#ifdef CFG_ENV_IS_IN_FLASH
	97	/* ENV protection ON by default */
	98	flash_protect(FLAG_PROTECT_SET,
	99	CFG_ENV_ADDR,
	100	CFG_ENV_ADDR+CFG_ENV_SECT_SIZE-1,
	101	&flash_info[0]);
	102	#endif
	103	#endif
	104	return (size);
	105	}
	106
	107	/*-----------------------------------------------------------------------
	108	*/
	109	void flash_print_info (flash_info_t *info)
	110	{
	111	int i;
	112
	113	if (info->flash_id == FLASH_UNKNOWN) {
	114	printf ("missing or unknown FLASH type\n");
	115	return;
	116	}
	117
	118	switch (info->flash_id & FLASH_VENDMASK) {
	119	case FLASH_MAN_INTEL: printf ("Intel "); break;
	120	case FLASH_MAN_SHARP: printf ("Sharp "); break;
	121	default: printf ("Unknown Vendor "); break;
	122	}
	123
	124	switch (info->flash_id & FLASH_TYPEMASK) {
	125	case FLASH_28F016SV: printf ("28F016SV (16 Mbit, 32 x 64k)\n");
	126	break;
	127	case FLASH_28F160S3: printf ("28F160S3 (16 Mbit, 32 x 512K)\n");
	128	break;
	129	case FLASH_28F320S3: printf ("28F320S3 (32 Mbit, 64 x 512K)\n");
	130	break;
	131	case FLASH_LH28F016SCT: printf ("28F016SC (16 Mbit, 32 x 64K)\n");
	132	break;
	133	case FLASH_28F640J3A: printf ("28F640J3A (64 Mbit, 64 x 128K)\n");
	134	break;
	135	default: printf ("Unknown Chip Type\n");
	136	break;
	137	}
	138
	139	printf (" Size: %ld MB in %d Sectors\n",
	140	info->size >> 20, info->sector_count);
	141
	142	printf (" Sector Start Addresses:");
	143	for (i=0; i<info->sector_count; ++i) {
	144	if ((i % 5) == 0)
	145	printf ("\n ");
	146	printf (" %08lX%s",
	147	info->start[i],
	148	info->protect[i] ? " (RO)" : " "
	149	);
	150	}
	151	printf ("\n");
	152	}
	153
	154	/*
	155	* The following code cannot be run from FLASH!
	156	*/
	157
	158	static ulong flash_get_size (vu_long addr, flash_info_t info)
159	{
160	short i;
161	ulong value;
162	ulong base = (ulong)addr;
163	ulong sector_offset;
164
165	#ifdef DEBUG
166	printf("Check flash at 0x%08x\n",(uint)addr);
167	#endif
168	/* Write "Intelligent Identifier" command: read Manufacturer ID */
169	*addr = 0x90909090;
170	udelay(20);
171	asm("sync");
172
173	value = addr[0] & 0x00FF00FF;
174
175	#ifdef DEBUG
176	printf("manufacturer=0x%x\n",(uint)value);
177	#endif
178	switch (value) {
179	case MT_MANUFACT: /* SHARP, MT or => Intel */
180	case INTEL_ALT_MANU:
181	info->flash_id = FLASH_MAN_INTEL;
182	break;
183	default:
184	printf("unknown manufacturer: %x\n", (unsigned int)value);
185	info->flash_id = FLASH_UNKNOWN;
186	info->sector_count = 0;
187	info->size = 0;
188	return (0); /* no or unknown flash */
189	}
190
191	value = addr[1] & 0x00FF00FF; /* device ID */
192
193	#ifdef DEBUG
194	printf("deviceID=0x%x\n",(uint)value);
195	#endif
196	switch (value) {
197	case (INTEL_ID_28F016S):
198	info->flash_id += FLASH_28F016SV;
199	info->sector_count = 32;
200	info->size = 0x00400000;
201	sector_offset = 0x20000;
202	break; /* => 2x2 MB */
203
204	case (INTEL_ID_28F160S3):
205	info->flash_id += FLASH_28F160S3;
206	info->sector_count = 32;
207	info->size = 0x00400000;
208	sector_offset = 0x20000;
209	break; /* => 2x2 MB */
210
211	case (INTEL_ID_28F320S3):
212	info->flash_id += FLASH_28F320S3;
213	info->sector_count = 64;
214	info->size = 0x00800000;
215	sector_offset = 0x20000;
216	break; /* => 2x4 MB */
217
218	case (INTEL_ID_28F640J3A):
219	info->flash_id += FLASH_28F640J3A;
220	info->sector_count = 64;
221	info->size = 0x01000000;
222	sector_offset = 0x40000;
223	break; /* => 8 MB */
224
225	case SHARP_ID_28F016SCL:
226	case SHARP_ID_28F016SCZ:
227	info->flash_id = FLASH_MAN_SHARP \| FLASH_LH28F016SCT;
228	info->sector_count = 32;
229	info->size = 0x00800000;
230	sector_offset = 0x40000;
231	break; /* => 4x2 MB */
232
233
234	default:
235	info->flash_id = FLASH_UNKNOWN;
236	return (0); /* => no or unknown flash */
237
238	}
239
240	/* set up sector start address table */
241	for (i = 0; i < info->sector_count; i++) {
242	info->start[i] = base;
243	base += sector_offset;
244	/* don't know how to check sector protection */
245	info->protect[i] = 0;
246	}
247
248	/*
249	* Prevent writes to uninitialized FLASH.
250	*/
251	if (info->flash_id != FLASH_UNKNOWN) {
252	addr = (vu_long *)info->start[0];
253	addr = 0xFFFFFF; / reset bank to read array mode */
254	asm("sync");
255	}
256
257	return (info->size);
258	}
259
260
261	/*-----------------------------------------------------------------------
262	*/
263
264	int flash_erase (flash_info_t *info, int s_first, int s_last)
265	{
266	int flag, prot, sect;
267	ulong start, now, last;
268
269	if ((s_first < 0) \|\| (s_first > s_last)) {
270	if (info->flash_id == FLASH_UNKNOWN) {
271	printf ("- missing\n");
272	} else {
273	printf ("- no sectors to erase\n");
274	}
275	return 1;
276	}
277
278	if ( ((info->flash_id & FLASH_VENDMASK) != FLASH_MAN_INTEL)
279	&& ((info->flash_id & FLASH_VENDMASK) != FLASH_MAN_SHARP) ) {
280	printf ("Can't erase unknown flash type %08lx - aborted\n",
281	info->flash_id);
282	return 1;
283	}
284
285	prot = 0;
286	for (sect=s_first; sect<=s_last; ++sect) {
287	if (info->protect[sect]) {
288	prot++;
289	}
290	}
291
292	if (prot) {
293	printf ("- Warning: %d protected sectors will not be erased!\n",
294	prot);
295	} else {
296	printf ("\n");
297	}
298
299	#ifdef DEBUG
300	printf("\nFlash Erase:\n");
301	#endif
302	/* Make Sure Block Lock Bit is not set. */
303	if(clear_block_lock_bit((vu_long *)(info->start[s_first]))){
304	return 1;
305	}
306
307	/* Start erase on unprotected sectors */
308	#if defined(DEBUG)
309	printf("Begin to erase now,s_first=0x%x s_last=0x%x...\n",s_first,s_last);
310	#endif
311	for (sect = s_first; sect<=s_last; sect++) {
312	if (info->protect[sect] == 0) { /* not protected */
313	vu_long addr = (vu_long )(info->start[sect]);
314	asm("sync");
315
316	last = start = get_timer (0);
317
318	/* Disable interrupts which might cause a timeout here */
319	flag = disable_interrupts();
320
321	/* Reset Array */
322	*addr = 0xffffffff;
323	asm("sync");
324	/* Clear Status Register */
325	*addr = 0x50505050;
326	asm("sync");
327	/* Single Block Erase Command */
328	*addr = 0x20202020;
329	asm("sync");
330	/* Confirm */
331	*addr = 0xD0D0D0D0;
332	asm("sync");
333
334	if((info->flash_id & FLASH_TYPEMASK) != FLASH_LH28F016SCT) {
335	/* Resume Command, as per errata update */
336	*addr = 0xD0D0D0D0;
337	asm("sync");
338	}
339
340	/* re-enable interrupts if necessary */
341	if (flag)
342	enable_interrupts();
343
344	/* wait at least 80us - let's wait 1 ms */
345	udelay (1000);
346	while ((*addr & 0x00800080) != 0x00800080) {
347	if(*addr & 0x00200020){
348	printf("Error in Block Erase - Lock Bit may be set!\n");
349	printf("Status Register = 0x%X\n", (uint)*addr);
350	addr = 0xFFFFFFFF; / reset bank */
351	asm("sync");
352	return 1;
353	}
354	if ((now=get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
355	printf ("Timeout\n");
356	addr = 0xFFFFFFFF; / reset bank */
357	asm("sync");
358	return 1;
359	}
360	/* show that we're waiting */
361	if ((now - last) > 1000) { /* every second */
362	putc ('.');
363	last = now;
364	}
365	}
366
367	/* reset to read mode */
368	*addr = 0xFFFFFFFF;
369	asm("sync");
370	}
371	}
372
373	printf ("flash erase done\n");
374	return 0;
375	}
376
377	/*-----------------------------------------------------------------------
378	* Copy memory to flash, returns:
379	* 0 - OK
380	* 1 - write timeout
381	* 2 - Flash not erased
382	*/
383
384	int write_buff (flash_info_t info, uchar src, ulong addr, ulong cnt)
385	{
386	ulong cp, wp, data;
387	int i, l, rc;
388
389	wp = (addr & ~3); /* get lower word aligned address */
390
391	/*
392	* handle unaligned start bytes
393	*/
394	if ((l = addr - wp) != 0) {
395	data = 0;
396	for (i=0, cp=wp; i<l; ++i, ++cp) {
397	data = (data << 8) \| ((uchar )cp);
398	}
399	for (; i<4 && cnt>0; ++i) {
400	data = (data << 8) \| *src++;
401	--cnt;
402	++cp;
403	}
404	for (; cnt==0 && i<4; ++i, ++cp) {
405	data = (data << 8) \| ((uchar )cp);
406	}
407
408	if ((rc = write_word(info, wp, data)) != 0) {
409	return (rc);
410	}
411	wp += 4;
412	}
413
414	/*
415	* handle word aligned part
416	*/
417	while (cnt >= 4) {
418	data = 0;
419	for (i=0; i<4; ++i) {
420	data = (data << 8) \| *src++;
421	}
422	if ((rc = write_word(info, wp, data)) != 0) {
423	return (rc);
424	}
425	wp += 4;
426	cnt -= 4;
427	}
428
429	if (cnt == 0) {
430	return (0);
431	}
432
433	/*
434	* handle unaligned tail bytes
435	*/
436	data = 0;
437	for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
438	data = (data << 8) \| *src++;
439	--cnt;
440	}
441	for (; i<4; ++i, ++cp) {
442	data = (data << 8) \| ((uchar )cp);
443	}
444
445	return (write_word(info, wp, data));
446	}
447
448	/*-----------------------------------------------------------------------
449	* Write a word to Flash, returns:
450	* 0 - OK
451	* 1 - write timeout
452	* 2 - Flash not erased
453	*/
454	static int write_word (flash_info_t *info, ulong dest, ulong data)
455	{
456	vu_long addr = (vu_long )dest;
457	ulong start, csr;
458	int flag;
459
460	/* Check if Flash is (sufficiently) erased */
461	if ((*addr & data) != data) {
462	return (2);
463	}
464	/* Disable interrupts which might cause a timeout here */
465	flag = disable_interrupts();
466
467	/* Write Command */
468	*addr = 0x10101010;
469	asm("sync");
470
471	/* Write Data */
472	*addr = data;
473
474	/* re-enable interrupts if necessary */
475	if (flag)
476	enable_interrupts();
477
478	/* data polling for D7 */
479	start = get_timer (0);
480	flag = 0;
481
482	while (((csr = *addr) & 0x00800080) != 0x00800080) {
483	if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
484	flag = 1;
485	break;
486	}
487	}
488	if (csr & 0x40404040) {
489	printf ("CSR indicates write error (%08lx) at %08lx\n", csr, (ulong)addr);
490	flag = 1;
491	}
492
493	/* Clear Status Registers Command */
494	*addr = 0x50505050;
495	asm("sync");
496	/* Reset to read array mode */
497	*addr = 0xFFFFFFFF;
498	asm("sync");
499
500	return (flag);
501	}
502
503	/*-----------------------------------------------------------------------
504	* Clear Block Lock Bit, returns:
505	* 0 - OK
506	* 1 - Timeout
507	*/
508
509	static int clear_block_lock_bit(vu_long * addr)
510	{
511	ulong start, now;
512
513	/* Reset Array */
514	*addr = 0xffffffff;
515	asm("sync");
516	/* Clear Status Register */
517	*addr = 0x50505050;
518	asm("sync");
519
520	*addr = 0x60606060;
521	asm("sync");
522	*addr = 0xd0d0d0d0;
523	asm("sync");
524
525	start = get_timer (0);
526	while((*addr & 0x00800080) != 0x00800080){
527	if ((now=get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
528	printf ("Timeout on clearing Block Lock Bit\n");
529	addr = 0xFFFFFFFF; / reset bank */
530	asm("sync");
531	return 1;
532	}
533	}
534	return 0;
535	}
536
537	#endif /* !CFG_NO_FLASH */