[people/ms/u-boot.git] / board / stx / stxgp3 / flash.c

/*
 * (C) Copyright 2003, Dan Malek, Embedded Edge, LLC.  <dan@embeddededge.com>
 * Copied from ADS85xx.
 * Updated to support the Silicon Tx GP3 8560.  We should only find
 * two Intel 28F640 parts in 16-bit mode (i.e. 32-bit wide flash),
 * but I left other code here in case people order custom boards.
 *
 * (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.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>

#if !defined(CONFIG_SYS_NO_FLASH)

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

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

/*-----------------------------------------------------------------------
 * 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<CONFIG_SYS_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 *)CONFIG_SYS_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 *)CONFIG_SYS_FLASH_BASE, &flash_info[0]);

	flash_info[0].size = size;

#if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
	/* monitor protection ON by default */
	flash_protect(FLAG_PROTECT_SET,
		      CONFIG_SYS_MONITOR_BASE,
		      CONFIG_SYS_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
#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_28F640C3T:	printf ("28F640C3T (64 Mbit x 2, 128 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];             /* device ID            */

#ifdef DEBUG
	printf("deviceID=0x%x\n",(uint)value);
#endif
	switch (value) {

	case (INTEL_ID_28F640C3T):
		info->flash_id += FLASH_28F640C3T;
		info->sector_count = 135;
		info->size = 0x01000000;
		sector_offset = 0x20000;
		break;				/* => 2x8 MB		*/

	default:
		info->flash_id = FLASH_UNKNOWN;
		return (0);			/* => no or unknown flash */

	}

	/* set up sector start address table
	 * The first 127 blocks are large, the last 8 are small.
	 */
	for (i = 0; i < 127; i++) {
		info->start[i] = base;
		base += sector_offset;
		/* Sectors are locked upon reset */
		info->protect[i] = 0;
	}
	for (i = 127; i < 135; i++) {
		info->start[i] = base;
		base += 0x4000;
		/* Sectors are locked upon reset */
		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)) > CONFIG_SYS_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) > CONFIG_SYS_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)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
			printf ("Timeout on clearing Block Lock Bit\n");
			*addr = 0xFFFFFFFF;	/* reset bank */
			asm("sync");
			return 1;
		}
	}
	return 0;
}

#endif /* !CONFIG_SYS_NO_FLASH */
Commit	Line	Data
7abf0c58 WD	1	/*
	2	* (C) Copyright 2003, Dan Malek, Embedded Edge, LLC. <dan@embeddededge.com>
	3	* Copied from ADS85xx.
	4	* Updated to support the Silicon Tx GP3 8560. We should only find
	5	* two Intel 28F640 parts in 16-bit mode (i.e. 32-bit wide flash),
	6	* but I left other code here in case people order custom boards.
	7	*
	8	* (C) Copyright 2003 Motorola Inc.
	9	* Xianghua Xiao,(X.Xiao@motorola.com)
	10	*
	11	* (C) Copyright 2000, 2001
	12	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	13	*
	14	* (C) Copyright 2001, Stuart Hughes, Lineo Inc, stuarth@lineo.com
	15	* Add support the Sharp chips on the mpc8260ads.
	16	* I started with board/ip860/flash.c and made changes I found in
	17	* the MTD project by David Schleef.
	18	*
1a459660	19	* SPDX-License-Identifier: GPL-2.0+
7abf0c58 WD	20	*/
	21
	22	#include <common.h>
	23
6d0f6bcf	24	#if !defined(CONFIG_SYS_NO_FLASH)
7abf0c58	25
6d0f6bcf	26	flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS]; /* info for FLASH chips */
7abf0c58	27
5a1aceb0	28	#if defined(CONFIG_ENV_IS_IN_FLASH)
0e8d1586	29	# ifndef CONFIG_ENV_ADDR
6d0f6bcf	30	# define CONFIG_ENV_ADDR (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
7abf0c58	31	# endif
0e8d1586 JCPV	32	# ifndef CONFIG_ENV_SIZE
0e8d1586 JCPV	33	# define CONFIG_ENV_SIZE CONFIG_ENV_SECT_SIZE
7abf0c58	34	# endif
0e8d1586 JCPV	35	# ifndef CONFIG_ENV_SECT_SIZE
0e8d1586 JCPV	36	# define CONFIG_ENV_SECT_SIZE CONFIG_ENV_SIZE
7abf0c58 WD	37	# endif
	38	#endif
	39
	40	#undef DEBUG
	41
	42	/*-----------------------------------------------------------------------
	43	* Functions
	44	*/
	45	static ulong flash_get_size (vu_long addr, flash_info_t info);
	46	static int write_word (flash_info_t *info, ulong dest, ulong data);
	47	static int clear_block_lock_bit(vu_long * addr);
	48	/*-----------------------------------------------------------------------
	49	*/
	50
	51	unsigned long flash_init (void)
	52	{
	53	unsigned long size;
	54	int i;
	55
	56	/* Init: enable write,
	57	* or we cannot even write flash commands
	58	*/
6d0f6bcf	59	for (i=0; i<CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
7abf0c58 WD	60	flash_info[i].flash_id = FLASH_UNKNOWN;
	61
	62	/* set the default sector offset */
	63	}
	64
	65	/* Static FLASH Bank configuration here - FIXME XXX */
	66
6d0f6bcf	67	size = flash_get_size((vu_long *)CONFIG_SYS_FLASH_BASE, &flash_info[0]);
7abf0c58 WD	68
	69	if (flash_info[0].flash_id == FLASH_UNKNOWN) {
	70	printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
	71	size, size<<20);
	72	}
	73
	74	/* Re-do sizing to get full correct info */
6d0f6bcf	75	size = flash_get_size((vu_long *)CONFIG_SYS_FLASH_BASE, &flash_info[0]);
7abf0c58 WD	76
	77	flash_info[0].size = size;
	78
6d0f6bcf	79	#if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
7abf0c58 WD	80	/* monitor protection ON by default */
7abf0c58 WD	81	flash_protect(FLAG_PROTECT_SET,
6d0f6bcf JCPV	82	CONFIG_SYS_MONITOR_BASE,
6d0f6bcf JCPV	83	CONFIG_SYS_MONITOR_BASE+monitor_flash_len-1,
7abf0c58	84	&flash_info[0]);
7abf0c58	85
5a1aceb0	86	#ifdef CONFIG_ENV_IS_IN_FLASH
7abf0c58 WD	87	/* ENV protection ON by default */
7abf0c58 WD	88	flash_protect(FLAG_PROTECT_SET,
0e8d1586 JCPV	89	CONFIG_ENV_ADDR,
0e8d1586 JCPV	90	CONFIG_ENV_ADDR+CONFIG_ENV_SECT_SIZE-1,
7abf0c58 WD	91	&flash_info[0]);
	92	#endif
	93	#endif
	94	return (size);
	95	}
	96
	97	/*-----------------------------------------------------------------------
	98	*/
	99	void flash_print_info (flash_info_t *info)
	100	{
	101	int i;
	102
	103	if (info->flash_id == FLASH_UNKNOWN) {
	104	printf ("missing or unknown FLASH type\n");
	105	return;
	106	}
	107
	108	switch (info->flash_id & FLASH_VENDMASK) {
	109	case FLASH_MAN_INTEL: printf ("Intel "); break;
	110	case FLASH_MAN_SHARP: printf ("Sharp "); break;
	111	default: printf ("Unknown Vendor "); break;
	112	}
	113
	114	switch (info->flash_id & FLASH_TYPEMASK) {
	115	case FLASH_28F640C3T: printf ("28F640C3T (64 Mbit x 2, 128 x 128k)\n");
	116	break;
	117	default: printf ("Unknown Chip Type\n");
	118	break;
	119	}
	120
	121	printf (" Size: %ld MB in %d Sectors\n",
	122	info->size >> 20, info->sector_count);
	123
	124	printf (" Sector Start Addresses:");
	125	for (i=0; i<info->sector_count; ++i) {
	126	if ((i % 5) == 0)
	127	printf ("\n ");
	128	printf (" %08lX%s",
	129	info->start[i],
	130	info->protect[i] ? " (RO)" : " "
	131	);
	132	}
	133	printf ("\n");
	134	}
	135
	136	/*
	137	* The following code cannot be run from FLASH!
	138	*/
	139
	140	static ulong flash_get_size (vu_long addr, flash_info_t info)
	141	{
	142	short i;
	143	ulong value;
	144	ulong base = (ulong)addr;
	145	ulong sector_offset;
	146
	147	#ifdef DEBUG
	148	printf("Check flash at 0x%08x\n",(uint)addr);
	149	#endif
	150	/* Write "Intelligent Identifier" command: read Manufacturer ID */
	151	*addr = 0x90909090;
	152	udelay(20);
	153	asm("sync");
	154
155	value = addr[0] & 0x00FF00FF;
156
157	#ifdef DEBUG
158	printf("manufacturer=0x%x\n",(uint)value);
159	#endif
160	switch (value) {
161	case MT_MANUFACT: /* SHARP, MT or => Intel */
162	case INTEL_ALT_MANU:
163	info->flash_id = FLASH_MAN_INTEL;
164	break;
165	default:
166	printf("unknown manufacturer: %x\n", (unsigned int)value);
167	info->flash_id = FLASH_UNKNOWN;
168	info->sector_count = 0;
169	info->size = 0;
170	return (0); /* no or unknown flash */
171	}
172
173	value = addr[1]; /* device ID */
174
175	#ifdef DEBUG
176	printf("deviceID=0x%x\n",(uint)value);
177	#endif
178	switch (value) {
179
180	case (INTEL_ID_28F640C3T):
181	info->flash_id += FLASH_28F640C3T;
182	info->sector_count = 135;
183	info->size = 0x01000000;
184	sector_offset = 0x20000;
185	break; /* => 2x8 MB */
186
187	default:
188	info->flash_id = FLASH_UNKNOWN;
189	return (0); /* => no or unknown flash */
190
191	}
192
193	/* set up sector start address table
194	* The first 127 blocks are large, the last 8 are small.
195	*/
196	for (i = 0; i < 127; i++) {
197	info->start[i] = base;
198	base += sector_offset;
199	/* Sectors are locked upon reset */
200	info->protect[i] = 0;
201	}
202	for (i = 127; i < 135; i++) {
203	info->start[i] = base;
204	base += 0x4000;
205	/* Sectors are locked upon reset */
206	info->protect[i] = 0;
207	}
208
209
210	/*
211	* Prevent writes to uninitialized FLASH.
212	*/
213	if (info->flash_id != FLASH_UNKNOWN) {
214	addr = (vu_long *)info->start[0];
215	addr = 0xFFFFFF; / reset bank to read array mode */
216	asm("sync");
217	}
218
219	return (info->size);
220	}
221
222
223	/*-----------------------------------------------------------------------
224	*/
225
226	int flash_erase (flash_info_t *info, int s_first, int s_last)
227	{
228	int flag, prot, sect;
229	ulong start, now, last;
230
231	if ((s_first < 0) \|\| (s_first > s_last)) {
232	if (info->flash_id == FLASH_UNKNOWN) {
233	printf ("- missing\n");
234	} else {
235	printf ("- no sectors to erase\n");
236	}
237	return 1;
238	}
239
240	if ( ((info->flash_id & FLASH_VENDMASK) != FLASH_MAN_INTEL)
241	&& ((info->flash_id & FLASH_VENDMASK) != FLASH_MAN_SHARP) ) {
242	printf ("Can't erase unknown flash type %08lx - aborted\n",
243	info->flash_id);
244	return 1;
245	}
246
247	prot = 0;
248	for (sect=s_first; sect<=s_last; ++sect) {
249	if (info->protect[sect]) {
250	prot++;
251	}
252	}
253
254	if (prot) {
255	printf ("- Warning: %d protected sectors will not be erased!\n",
256	prot);
257	} else {
258	printf ("\n");
259	}
260
261	#ifdef DEBUG
262	printf("\nFlash Erase:\n");
263	#endif
264	/* Make Sure Block Lock Bit is not set. */
265	if(clear_block_lock_bit((vu_long *)(info->start[s_first]))){
266	return 1;
267	}
268
269	/* Start erase on unprotected sectors */
270	#if defined(DEBUG)
271	printf("Begin to erase now,s_first=0x%x s_last=0x%x...\n",s_first,s_last);
272	#endif
273	for (sect = s_first; sect<=s_last; sect++) {
274	if (info->protect[sect] == 0) { /* not protected */
275	vu_long addr = (vu_long )(info->start[sect]);
276	asm("sync");
277
278	last = start = get_timer (0);
279
280	/* Disable interrupts which might cause a timeout here */
281	flag = disable_interrupts();
282
283	/* Reset Array */
284	*addr = 0xffffffff;
285	asm("sync");
286	/* Clear Status Register */
287	*addr = 0x50505050;
288	asm("sync");
289	/* Single Block Erase Command */
290	*addr = 0x20202020;
291	asm("sync");
292	/* Confirm */
293	*addr = 0xD0D0D0D0;
294	asm("sync");
295
296	if((info->flash_id & FLASH_TYPEMASK) != FLASH_LH28F016SCT) {
297	/* Resume Command, as per errata update */
298	*addr = 0xD0D0D0D0;
299	asm("sync");
300	}
301
302	/* re-enable interrupts if necessary */
303	if (flag)
304	enable_interrupts();
305
306	/* wait at least 80us - let's wait 1 ms */
307	udelay (1000);
308	while ((*addr & 0x00800080) != 0x00800080) {
309	if(*addr & 0x00200020){
310	printf("Error in Block Erase - Lock Bit may be set!\n");
311	printf("Status Register = 0x%X\n", (uint)*addr);
312	addr = 0xFFFFFFFF; / reset bank */
313	asm("sync");
314	return 1;
315	}
6d0f6bcf	316	if ((now=get_timer(start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
7abf0c58 WD	317	printf ("Timeout\n");
	318	addr = 0xFFFFFFFF; / reset bank */
	319	asm("sync");
	320	return 1;
	321	}
	322	/* show that we're waiting */
	323	if ((now - last) > 1000) { /* every second */
	324	putc ('.');
	325	last = now;
	326	}
	327	}
	328
	329	/* reset to read mode */
	330	*addr = 0xFFFFFFFF;
	331	asm("sync");
	332	}
	333	}
	334
	335	printf ("flash erase done\n");
	336	return 0;
	337	}
	338
	339	/*-----------------------------------------------------------------------
	340	* Copy memory to flash, returns:
	341	* 0 - OK
	342	* 1 - write timeout
	343	* 2 - Flash not erased
	344	*/
	345
	346	int write_buff (flash_info_t info, uchar src, ulong addr, ulong cnt)
	347	{
	348	ulong cp, wp, data;
	349	int i, l, rc;
	350
	351	wp = (addr & ~3); /* get lower word aligned address */
	352
	353	/*
	354	* handle unaligned start bytes
	355	*/
	356	if ((l = addr - wp) != 0) {
	357	data = 0;
	358	for (i=0, cp=wp; i<l; ++i, ++cp) {
	359	data = (data << 8) \| ((uchar )cp);
	360	}
	361	for (; i<4 && cnt>0; ++i) {
	362	data = (data << 8) \| *src++;
	363	--cnt;
	364	++cp;
	365	}
	366	for (; cnt==0 && i<4; ++i, ++cp) {
	367	data = (data << 8) \| ((uchar )cp);
	368	}
	369
	370	if ((rc = write_word(info, wp, data)) != 0) {
	371	return (rc);
	372	}
	373	wp += 4;
	374	}
	375
	376	/*
	377	* handle word aligned part
	378	*/
	379	while (cnt >= 4) {
	380	data = 0;
381	for (i=0; i<4; ++i) {
382	data = (data << 8) \| *src++;
383	}
384	if ((rc = write_word(info, wp, data)) != 0) {
385	return (rc);
386	}
387	wp += 4;
388	cnt -= 4;
389	}
390
391	if (cnt == 0) {
392	return (0);
393	}
394
395	/*
396	* handle unaligned tail bytes
397	*/
398	data = 0;
399	for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
400	data = (data << 8) \| *src++;
401	--cnt;
402	}
403	for (; i<4; ++i, ++cp) {
404	data = (data << 8) \| ((uchar )cp);
405	}
406
407	return (write_word(info, wp, data));
408	}
409
410	/*-----------------------------------------------------------------------
411	* Write a word to Flash, returns:
412	* 0 - OK
413	* 1 - write timeout
414	* 2 - Flash not erased
415	*/
416	static int write_word (flash_info_t *info, ulong dest, ulong data)
417	{
418	vu_long addr = (vu_long )dest;
419	ulong start, csr;
420	int flag;
421
422	/* Check if Flash is (sufficiently) erased */
423	if ((*addr & data) != data) {
424	return (2);
425	}
426	/* Disable interrupts which might cause a timeout here */
427	flag = disable_interrupts();
428
429	/* Write Command */
430	*addr = 0x10101010;
431	asm("sync");
432
433	/* Write Data */
434	*addr = data;
435
436	/* re-enable interrupts if necessary */
437	if (flag)
438	enable_interrupts();
439
440	/* data polling for D7 */
441	start = get_timer (0);
442	flag = 0;
443
444	while (((csr = *addr) & 0x00800080) != 0x00800080) {
6d0f6bcf	445	if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
7abf0c58 WD	446	flag = 1;
	447	break;
	448	}
	449	}
	450	if (csr & 0x40404040) {
	451	printf ("CSR indicates write error (%08lx) at %08lx\n", csr, (ulong)addr);
	452	flag = 1;
	453	}
	454
	455	/* Clear Status Registers Command */
	456	*addr = 0x50505050;
	457	asm("sync");
	458	/* Reset to read array mode */
	459	*addr = 0xFFFFFFFF;
	460	asm("sync");
	461
	462	return (flag);
	463	}
	464
	465	/*-----------------------------------------------------------------------
	466	* Clear Block Lock Bit, returns:
	467	* 0 - OK
	468	* 1 - Timeout
	469	*/
	470
	471	static int clear_block_lock_bit(vu_long * addr)
	472	{
	473	ulong start, now;
	474
	475	/* Reset Array */
	476	*addr = 0xffffffff;
	477	asm("sync");
	478	/* Clear Status Register */
	479	*addr = 0x50505050;
	480	asm("sync");
	481
	482	*addr = 0x60606060;
	483	asm("sync");
	484	*addr = 0xd0d0d0d0;
	485	asm("sync");
	486
	487	start = get_timer (0);
	488	while((*addr & 0x00800080) != 0x00800080){
6d0f6bcf	489	if ((now=get_timer(start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
7abf0c58 WD	490	printf ("Timeout on clearing Block Lock Bit\n");
	491	addr = 0xFFFFFFFF; / reset bank */
	492	asm("sync");
	493	return 1;
	494	}
	495	}
	496	return 0;
	497	}
	498
6d0f6bcf	499	#endif /* !CONFIG_SYS_NO_FLASH */