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

/*
 * (C) Copyright 2002-2005
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * (C) Copyright 2002 Jun Gu <jung@artesyncp.com>
 * Add support for Am29F016D and dynamic switch setting.
 *
 * 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
 */
/*
 * Ported from Ebony flash support
 * Travis B. Sawyer
 * Sandburst Corporation
 */
#include <common.h>
#include <ppc4xx.h>
#include <asm/processor.h>


#undef DEBUG
#ifdef DEBUG
#define DEBUGF(x...) printf(x)
#else
#define DEBUGF(x...)
#endif /* DEBUG */


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

static unsigned long flash_addr_table[8][CONFIG_SYS_MAX_FLASH_BANKS] = {
	{0xfff80000}	/* Boot Flash */
};

/*-----------------------------------------------------------------------
 * 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);


#define ADDR0		0x5555
#define ADDR1		0x2aaa
#define FLASH_WORD_SIZE unsigned char


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

unsigned long flash_init (void)
{
	unsigned long total_b = 0;
	unsigned long size_b[CONFIG_SYS_MAX_FLASH_BANKS];
	unsigned short index = 0;
	int i;


	DEBUGF("\n");
	DEBUGF("FLASH: Index: %d\n", index);

	/* Init: no FLASHes known */
	for (i=0; i<CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
		flash_info[i].flash_id = FLASH_UNKNOWN;
		flash_info[i].sector_count = -1;
		flash_info[i].size = 0;

		/* check whether the address is 0 */
		if (flash_addr_table[index][i] == 0) {
			continue;
		}

		/* call flash_get_size() to initialize sector address */
		size_b[i] = flash_get_size(
			(vu_long *)flash_addr_table[index][i], &flash_info[i]);
		flash_info[i].size = size_b[i];
		if (flash_info[i].flash_id == FLASH_UNKNOWN) {
			printf ("## Unknown FLASH on Bank %d - Size = 0x%08lx = %ld MB\n",
				i, size_b[i], size_b[i]<<20);
			flash_info[i].sector_count = -1;
			flash_info[i].size = 0;
		}

		total_b += flash_info[i].size;
	}

	return total_b;
}


/*-----------------------------------------------------------------------
 */
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_AM040:	printf ("AM29F040 (512 Kbit, uniform sector size)\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");
		return;
	}

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


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

/*
 * 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;

	DEBUGF("FLASH ADDR: %08x\n", (unsigned)addr );

	/* Write auto select command: read Manufacturer ID */
	udelay(10000);
	addr2[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
	udelay(1000);
	addr2[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
	udelay(1000);
	addr2[ADDR0] = (FLASH_WORD_SIZE)0x00900090;
	udelay(1000);

	value = addr2[0];

	DEBUGF("FLASH MANUFACT: %x\n", value);

	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		*/

	DEBUGF("\nFLASH DEVICEID: %x\n", value);

	switch (value) {
	case (FLASH_WORD_SIZE)AMD_ID_LV040B:
		info->flash_id += FLASH_AM040;
		info->sector_count = 8;
		info->size = 0x00080000; /* => 512 kb */
		break;

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

	}

	/* set up sector start address table */
	if (info->flash_id  == FLASH_AM040) {
		for (i = 0; i < info->sector_count; i++)
			info->start[i] = base + (i * 0x00010000);
	} else {
		if (info->flash_id & FLASH_BTYPE) {
			/* set sector offsets for bottom boot block type	*/
			info->start[0] = base + 0x00000000;
			info->start[1] = base + 0x00004000;
			info->start[2] = base + 0x00006000;
			info->start[3] = base + 0x00008000;
			for (i = 4; i < info->sector_count; i++) {
				info->start[i] = base + (i * 0x00010000) - 0x00030000;
			}
		} else {
			/* set sector offsets for top boot block type		*/
			i = info->sector_count - 1;
			info->start[i--] = base + info->size - 0x00004000;
			info->start[i--] = base + info->size - 0x00006000;
			info->start[i--] = base + info->size - 0x00008000;
			for (; i >= 0; 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]);
		if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST)
			info->protect[i] = 0;
		else
			info->protect[i] = addr2[2] & 1;
	}

	/* reset to return to reading data */
	addr2[0] = (FLASH_WORD_SIZE) 0x00F000F0;	/* reset bank */

	/*
	 * 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)) > CONFIG_SYS_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;
	int i;

	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]);
			DEBUGF("Erasing sector %p\n", addr2);

			if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) {
				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)0x00500050;	 /* block erase */
				for (i=0; i<50; i++)
					udelay(1000);  /* wait 1 ms */
			} else {
				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 i;

	/* Check if Flash is (sufficiently) erased */
	if ((*((volatile FLASH_WORD_SIZE *) dest) &
	     (FLASH_WORD_SIZE) data) != (FLASH_WORD_SIZE) data) {
		return (2);
	}

	for (i = 0; i < 4 / sizeof (FLASH_WORD_SIZE); i++) {
		int flag;

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

		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) > CONFIG_SYS_FLASH_WRITE_TOUT) {
				return (1);
			}
		}
	}

	return (0);
}
Commit	Line	Data
b79316f2 SR	1	/*
	2	* (C) Copyright 2002-2005
	3	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	4	*
	5	* (C) Copyright 2002 Jun Gu <jung@artesyncp.com>
	6	* Add support for Am29F016D and dynamic switch setting.
	7	*
	8	* See file CREDITS for list of people who contributed to this
	9	* project.
	10	*
	11	* This program is free software; you can redistribute it and/or
	12	* modify it under the terms of the GNU General Public License as
	13	* published by the Free Software Foundation; either version 2 of
	14	* the License, or (at your option) any later version.
	15	*
	16	* This program is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	* GNU General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License
	22	* along with this program; if not, write to the Free Software
	23	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	24	* MA 02111-1307 USA
	25	*/
	26	/*
	27	* Ported from Ebony flash support
	28	* Travis B. Sawyer
	29	* Sandburst Corporation
	30	*/
	31	#include <common.h>
	32	#include <ppc4xx.h>
	33	#include <asm/processor.h>
	34
	35
	36	#undef DEBUG
	37	#ifdef DEBUG
	38	#define DEBUGF(x...) printf(x)
	39	#else
	40	#define DEBUGF(x...)
	41	#endif /* DEBUG */
	42
	43
6d0f6bcf	44	flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS]; /* info for FLASH chips */
b79316f2	45
6d0f6bcf	46	static unsigned long flash_addr_table[8][CONFIG_SYS_MAX_FLASH_BANKS] = {
b79316f2 SR	47	{0xfff80000} /* Boot Flash */
	48	};
	49
	50	/*-----------------------------------------------------------------------
	51	* Functions
	52	*/
	53	static ulong flash_get_size (vu_long addr, flash_info_t info);
	54	static int write_word (flash_info_t *info, ulong dest, ulong data);
	55
	56
	57	#define ADDR0 0x5555
	58	#define ADDR1 0x2aaa
	59	#define FLASH_WORD_SIZE unsigned char
	60
	61
	62	/*-----------------------------------------------------------------------
	63	*/
	64
	65	unsigned long flash_init (void)
	66	{
	67	unsigned long total_b = 0;
6d0f6bcf	68	unsigned long size_b[CONFIG_SYS_MAX_FLASH_BANKS];
b79316f2 SR	69	unsigned short index = 0;
	70	int i;
	71
	72
	73	DEBUGF("\n");
	74	DEBUGF("FLASH: Index: %d\n", index);
	75
	76	/* Init: no FLASHes known */
6d0f6bcf	77	for (i=0; i<CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
b79316f2 SR	78	flash_info[i].flash_id = FLASH_UNKNOWN;
	79	flash_info[i].sector_count = -1;
	80	flash_info[i].size = 0;
	81
	82	/* check whether the address is 0 */
	83	if (flash_addr_table[index][i] == 0) {
	84	continue;
	85	}
	86
	87	/* call flash_get_size() to initialize sector address */
	88	size_b[i] = flash_get_size(
	89	(vu_long *)flash_addr_table[index][i], &flash_info[i]);
	90	flash_info[i].size = size_b[i];
	91	if (flash_info[i].flash_id == FLASH_UNKNOWN) {
	92	printf ("## Unknown FLASH on Bank %d - Size = 0x%08lx = %ld MB\n",
	93	i, size_b[i], size_b[i]<<20);
	94	flash_info[i].sector_count = -1;
	95	flash_info[i].size = 0;
	96	}
	97
	98	total_b += flash_info[i].size;
	99	}
	100
	101	return total_b;
	102	}
	103
	104
	105	/*-----------------------------------------------------------------------
	106	*/
	107	void flash_print_info (flash_info_t *info)
	108	{
	109	int i;
	110	int k;
	111	int size;
	112	int erased;
	113	volatile unsigned long *flash;
	114
	115	if (info->flash_id == FLASH_UNKNOWN) {
	116	printf ("missing or unknown FLASH type\n");
	117	return;
	118	}
	119
	120	switch (info->flash_id & FLASH_VENDMASK) {
	121	case FLASH_MAN_AMD: printf ("AMD "); break;
	122	default: printf ("Unknown Vendor "); break;
	123	}
	124
	125	switch (info->flash_id & FLASH_TYPEMASK) {
	126	case FLASH_AM040: printf ("AM29F040 (512 Kbit, uniform sector size)\n");
	127	break;
	128	default: printf ("Unknown Chip Type\n");
	129	break;
	130	}
	131
	132	printf (" Size: %ld KB in %d Sectors\n",
	133	info->size >> 10, info->sector_count);
	134
	135	printf (" Sector Start Addresses:");
	136	for (i=0; i<info->sector_count; ++i) {
	137	/*
	138	* Check if whole sector is erased
	139	*/
	140	if (i != (info->sector_count-1))
	141	size = info->start[i+1] - info->start[i];
142	else
143	size = info->start[0] + info->size - info->start[i];
144	erased = 1;
145	flash = (volatile unsigned long *)info->start[i];
146	size = size >> 2; /* divide by 4 for longword access */
147	for (k=0; k<size; k++)
148	{
149	if (*flash++ != 0xffffffff)
150	{
151	erased = 0;
152	break;
153	}
154	}
155
156	if ((i % 5) == 0)
157	printf ("\n ");
158	printf (" %08lX%s%s",
159	info->start[i],
160	erased ? " E" : " ",
161	info->protect[i] ? "RO " : " "
162	);
163	}
164	printf ("\n");
165	return;
166	}
167
168	/*-----------------------------------------------------------------------
169	*/
170
171
172	/*-----------------------------------------------------------------------
173	*/
174
175	/*
176	* The following code cannot be run from FLASH!
177	*/
178	static ulong flash_get_size (vu_long addr, flash_info_t info)
179	{
180	short i;
181	FLASH_WORD_SIZE value;
182	ulong base = (ulong)addr;
183	volatile FLASH_WORD_SIZE addr2 = (FLASH_WORD_SIZE )addr;
184
185	DEBUGF("FLASH ADDR: %08x\n", (unsigned)addr );
186
187	/* Write auto select command: read Manufacturer ID */
188	udelay(10000);
189	addr2[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
190	udelay(1000);
191	addr2[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
192	udelay(1000);
193	addr2[ADDR0] = (FLASH_WORD_SIZE)0x00900090;
194	udelay(1000);
195
196	value = addr2[0];
197
198	DEBUGF("FLASH MANUFACT: %x\n", value);
199
200	switch (value) {
201	case (FLASH_WORD_SIZE)AMD_MANUFACT:
202	info->flash_id = FLASH_MAN_AMD;
203	break;
204	default:
205	info->flash_id = FLASH_UNKNOWN;
206	info->sector_count = 0;
207	info->size = 0;
208	return (0); /* no or unknown flash */
209	}
210
211	value = addr2[1]; /* device ID */
212
213	DEBUGF("\nFLASH DEVICEID: %x\n", value);
214
215	switch (value) {
216	case (FLASH_WORD_SIZE)AMD_ID_LV040B:
217	info->flash_id += FLASH_AM040;
218	info->sector_count = 8;
219	info->size = 0x00080000; /* => 512 kb */
220	break;
221
222	default:
223	info->flash_id = FLASH_UNKNOWN;
224	return (0); /* => no or unknown flash */
225
226	}
227
228	/* set up sector start address table */
229	if (info->flash_id == FLASH_AM040) {
230	for (i = 0; i < info->sector_count; i++)
231	info->start[i] = base + (i * 0x00010000);
232	} else {
233	if (info->flash_id & FLASH_BTYPE) {
234	/* set sector offsets for bottom boot block type */
235	info->start[0] = base + 0x00000000;
236	info->start[1] = base + 0x00004000;
237	info->start[2] = base + 0x00006000;
238	info->start[3] = base + 0x00008000;
239	for (i = 4; i < info->sector_count; i++) {
240	info->start[i] = base + (i * 0x00010000) - 0x00030000;
241	}
242	} else {
243	/* set sector offsets for top boot block type */
244	i = info->sector_count - 1;
245	info->start[i--] = base + info->size - 0x00004000;
246	info->start[i--] = base + info->size - 0x00006000;
247	info->start[i--] = base + info->size - 0x00008000;
248	for (; i >= 0; i--) {
249	info->start[i] = base + i * 0x00010000;
250	}
251	}
252	}
253
254	/* check for protected sectors */
255	for (i = 0; i < info->sector_count; i++) {
256	/* read sector protection at sector address, (A7 .. A0) = 0x02 */
257	/* D0 = 1 if protected */
258	addr2 = (volatile FLASH_WORD_SIZE *)(info->start[i]);
259	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST)
260	info->protect[i] = 0;
261	else
262	info->protect[i] = addr2[2] & 1;
263	}
264
265	/* reset to return to reading data */
266	addr2[0] = (FLASH_WORD_SIZE) 0x00F000F0; /* reset bank */
267
268	/*
269	* Prevent writes to uninitialized FLASH.
270	*/
271	if (info->flash_id != FLASH_UNKNOWN) {
272	addr2 = (FLASH_WORD_SIZE *)info->start[0];
273	addr2 = (FLASH_WORD_SIZE)0x00F000F0; / reset bank */
274	}
275
276	return (info->size);
277	}
278
279	int wait_for_DQ7(flash_info_t *info, int sect)
280	{
281	ulong start, now, last;
282	volatile FLASH_WORD_SIZE addr = (FLASH_WORD_SIZE )(info->start[sect]);
283
284	start = get_timer (0);
285	last = start;
286	while ((addr[0] & (FLASH_WORD_SIZE)0x00800080) != (FLASH_WORD_SIZE)0x00800080) {
6d0f6bcf	287	if ((now = get_timer(start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
b79316f2 SR	288	printf ("Timeout\n");
	289	return -1;
	290	}
	291	/* show that we're waiting */
	292	if ((now - last) > 1000) { /* every second */
	293	putc ('.');
	294	last = now;
	295	}
	296	}
	297	return 0;
	298	}
	299
	300	/*-----------------------------------------------------------------------
	301	*/
	302
	303	int flash_erase (flash_info_t *info, int s_first, int s_last)
	304	{
	305	volatile FLASH_WORD_SIZE addr = (FLASH_WORD_SIZE )(info->start[0]);
	306	volatile FLASH_WORD_SIZE *addr2;
	307	int flag, prot, sect, l_sect;
	308	int i;
	309
	310	if ((s_first < 0) \|\| (s_first > s_last)) {
	311	if (info->flash_id == FLASH_UNKNOWN) {
	312	printf ("- missing\n");
	313	} else {
	314	printf ("- no sectors to erase\n");
	315	}
	316	return 1;
	317	}
	318
	319	if (info->flash_id == FLASH_UNKNOWN) {
	320	printf ("Can't erase unknown flash type - aborted\n");
	321	return 1;
	322	}
	323
	324	prot = 0;
	325	for (sect=s_first; sect<=s_last; ++sect) {
	326	if (info->protect[sect]) {
	327	prot++;
	328	}
	329	}
	330
	331	if (prot) {
	332	printf ("- Warning: %d protected sectors will not be erased!\n",
	333	prot);
	334	} else {
	335	printf ("\n");
	336	}
	337
	338	l_sect = -1;
	339
	340	/* Disable interrupts which might cause a timeout here */
	341	flag = disable_interrupts();
	342
	343	/* Start erase on unprotected sectors */
	344	for (sect = s_first; sect<=s_last; sect++) {
	345	if (info->protect[sect] == 0) { /* not protected */
	346	addr2 = (FLASH_WORD_SIZE *)(info->start[sect]);
	347	DEBUGF("Erasing sector %p\n", addr2);
	348
	349	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) {
	350	addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
	351	addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
352	addr[ADDR0] = (FLASH_WORD_SIZE)0x00800080;
353	addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
354	addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
355	addr2[0] = (FLASH_WORD_SIZE)0x00500050; /* block erase */
356	for (i=0; i<50; i++)
357	udelay(1000); /* wait 1 ms */
358	} else {
359	addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
360	addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
361	addr[ADDR0] = (FLASH_WORD_SIZE)0x00800080;
362	addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
363	addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
364	addr2[0] = (FLASH_WORD_SIZE)0x00300030; /* sector erase */
365	}
366	l_sect = sect;
367	/*
368	* Wait for each sector to complete, it's more
369	* reliable. According to AMD Spec, you must
370	* issue all erase commands within a specified
371	* timeout. This has been seen to fail, especially
372	* if printf()s are included (for debug)!!
373	*/
374	wait_for_DQ7(info, sect);
375	}
376	}
377
378	/* re-enable interrupts if necessary */
379	if (flag)
380	enable_interrupts();
381
382	/* wait at least 80us - let's wait 1 ms */
383	udelay (1000);
384
385	/* reset to read mode */
386	addr = (FLASH_WORD_SIZE *)info->start[0];
387	addr[0] = (FLASH_WORD_SIZE)0x00F000F0; /* reset bank */
388
389	printf (" done\n");
390	return 0;
391	}
392
393	/*-----------------------------------------------------------------------
394	* Copy memory to flash, returns:
395	* 0 - OK
396	* 1 - write timeout
397	* 2 - Flash not erased
398	*/
399
400	int write_buff (flash_info_t info, uchar src, ulong addr, ulong cnt)
401	{
402	ulong cp, wp, data;
403	int i, l, rc;
404
405	wp = (addr & ~3); /* get lower word aligned address */
406
407	/*
408	* handle unaligned start bytes
409	*/
410	if ((l = addr - wp) != 0) {
411	data = 0;
412	for (i=0, cp=wp; i<l; ++i, ++cp) {
413	data = (data << 8) \| ((uchar )cp);
414	}
415	for (; i<4 && cnt>0; ++i) {
416	data = (data << 8) \| *src++;
417	--cnt;
418	++cp;
419	}
420	for (; cnt==0 && i<4; ++i, ++cp) {
421	data = (data << 8) \| ((uchar )cp);
422	}
423
424	if ((rc = write_word(info, wp, data)) != 0) {
425	return (rc);
426	}
427	wp += 4;
428	}
429
430	/*
431	* handle word aligned part
432	*/
433	while (cnt >= 4) {
434	data = 0;
435	for (i=0; i<4; ++i) {
436	data = (data << 8) \| *src++;
437	}
438	if ((rc = write_word(info, wp, data)) != 0) {
439	return (rc);
440	}
441	wp += 4;
442	cnt -= 4;
443	}
444
445	if (cnt == 0) {
446	return (0);
447	}
448
449	/*
450	* handle unaligned tail bytes
451	*/
452	data = 0;
453	for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
454	data = (data << 8) \| *src++;
455	--cnt;
456	}
457	for (; i<4; ++i, ++cp) {
458	data = (data << 8) \| ((uchar )cp);
459	}
460
461	return (write_word(info, wp, data));
462	}
463
464	/*-----------------------------------------------------------------------
465	* Write a word to Flash, returns:
466	* 0 - OK
467	* 1 - write timeout
468	* 2 - Flash not erased
469	*/
470	static int write_word (flash_info_t * info, ulong dest, ulong data)
471	{
472	volatile FLASH_WORD_SIZE addr2 = (FLASH_WORD_SIZE ) (info->start[0]);
473	volatile FLASH_WORD_SIZE dest2 = (FLASH_WORD_SIZE ) dest;
474	volatile FLASH_WORD_SIZE data2 = (FLASH_WORD_SIZE ) & data;
475	ulong start;
476	int i;
477
478	/* Check if Flash is (sufficiently) erased */
479	if ((((volatile FLASH_WORD_SIZE ) dest) &
480	(FLASH_WORD_SIZE) data) != (FLASH_WORD_SIZE) data) {
481	return (2);
482	}
483
484	for (i = 0; i < 4 / sizeof (FLASH_WORD_SIZE); i++) {
485	int flag;
486
487	/* Disable interrupts which might cause a timeout here */
488	flag = disable_interrupts ();
489
490	addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
491	addr2[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
492	addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00A000A0;
493
494	dest2[i] = data2[i];
495
496	/* re-enable interrupts if necessary */
497	if (flag)
498	enable_interrupts ();
499
500	/* data polling for D7 */
501	start = get_timer (0);
502	while ((dest2[i] & (FLASH_WORD_SIZE) 0x00800080) !=
503	(data2[i] & (FLASH_WORD_SIZE) 0x00800080)) {
504
6d0f6bcf	505	if (get_timer (start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
b79316f2 SR	506	return (1);
	507	}
	508	}
	509	}
	510
	511	return (0);
	512	}