[J-u-boot.git] / board / hermes / flash.c

/*
 * (C) Copyright 2000
 * Wolfgang Denk, DENX Software Engineering, [email protected].
 *
 * 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>

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_byte (flash_info_t *info, ulong dest, uchar data);
static void flash_get_offsets (ulong base, flash_info_t *info);

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

unsigned long flash_init (void)
{
	volatile immap_t     *immap  = (immap_t *)CFG_IMMR;
	volatile memctl8xx_t *memctl = &immap->im_memctl;
	unsigned long size;
	int i;

	/* Init: no FLASHes known */
	for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
		flash_info[i].flash_id = FLASH_UNKNOWN;
	}

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

	size = 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, size<<20);
	}

	/* Remap FLASH according to real size */
	memctl->memc_or0 = CFG_OR_TIMING_FLASH | (-size & 0xFFFF8000);
	memctl->memc_br0 = (CFG_FLASH_BASE & BR_BA_MSK) |
				(memctl->memc_br0 & ~(BR_BA_MSK));

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

	flash_get_offsets (CFG_FLASH_BASE, &flash_info[0]);

#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]);
#endif

	flash_info[0].size = size;

	return (size);
}

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

	/* set up sector start address table */
	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;
		}
	}

}

/*-----------------------------------------------------------------------
 */
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_AM400B:	printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
				break;
	case FLASH_AM400T:	printf ("AM29LV400T (4 Mbit, top boot sector)\n");
				break;
	case FLASH_AM800B:	printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
				break;
	case FLASH_AM800T:	printf ("AM29LV800T (8 Mbit, top boot sector)\n");
				break;
	case FLASH_AM160B:	printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
				break;
	case FLASH_AM160T:	printf ("AM29LV160T (16 Mbit, top boot sector)\n");
				break;
	case FLASH_AM320B:	printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
				break;
	case FLASH_AM320T:	printf ("AM29LV320T (32 Mbit, top boot sector)\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");
	return;
}

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


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

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

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


	/* Write auto select command: read Manufacturer ID */
	caddr[0x0AAA] = 0xAA;
	caddr[0x0555] = 0x55;
	caddr[0x0AAA] = 0x90;

	value = caddr[0];
	switch (value) {
	case (AMD_MANUFACT & 0xFF):
		info->flash_id = FLASH_MAN_AMD;
		break;
	case (FUJ_MANUFACT & 0xFF):
		info->flash_id = FLASH_MAN_FUJ;
		break;
	default:
		info->flash_id = FLASH_UNKNOWN;
		info->sector_count = 0;
		info->size = 0;
		return (0);			/* no or unknown flash	*/
	}

	value = caddr[2];			/* device ID		*/

	switch (value) {
	case (AMD_ID_LV400T & 0xFF):
		info->flash_id += FLASH_AM400T;
		info->sector_count = 11;
		info->size = 0x00080000;
		break;				/* => 512 kB		*/

	case (AMD_ID_LV400B & 0xFF):
		info->flash_id += FLASH_AM400B;
		info->sector_count = 11;
		info->size = 0x00080000;
		break;				/* => 512 kB		*/

	case (AMD_ID_LV800T & 0xFF):
		info->flash_id += FLASH_AM800T;
		info->sector_count = 19;
		info->size = 0x00100000;
		break;				/* => 1 MB		*/

	case (AMD_ID_LV800B & 0xFF):
		info->flash_id += FLASH_AM800B;
		info->sector_count = 19;
		info->size = 0x00100000;
		break;				/* => 1 MB		*/

	case (AMD_ID_LV160T & 0xFF):
		info->flash_id += FLASH_AM160T;
		info->sector_count = 35;
		info->size = 0x00200000;
		break;				/* => 2 MB		*/

	case (AMD_ID_LV160B & 0xFF):
		info->flash_id += FLASH_AM160B;
		info->sector_count = 35;
		info->size = 0x00200000;
		break;				/* => 2 MB		*/
#if 0	/* enable when device IDs are available */
	case (AMD_ID_LV320T & 0xFF):
		info->flash_id += FLASH_AM320T;
		info->sector_count = 67;
		info->size = 0x00400000;
		break;				/* => 4 MB		*/

	case (AMD_ID_LV320B & 0xFF):
		info->flash_id += FLASH_AM320B;
		info->sector_count = 67;
		info->size = 0x00400000;
		break;				/* => 4 MB		*/
#endif
	default:
		info->flash_id = FLASH_UNKNOWN;
		return (0);			/* => no or unknown flash */

	}

	/* set up sector start address table */
	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: D0 = 1 if protected */
		caddr = (volatile unsigned char *)(info->start[i]);
		info->protect[i] = caddr[4] & 1;
	}

	/*
	 * Prevent writes to uninitialized FLASH.
	 */
	if (info->flash_id != FLASH_UNKNOWN) {
		caddr = (vu_char *)info->start[0];

		*caddr = 0xF0;	/* reset bank */
	}

	return (info->size);
}


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

int	flash_erase (flash_info_t *info, int s_first, int s_last)
{
	vu_char *addr = (vu_char*)(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[0x0AAA] = 0xAA;
	addr[0x0555] = 0x55;
	addr[0x0AAA] = 0x80;
	addr[0x0AAA] = 0xAA;
	addr[0x0555] = 0x55;

	/* Start erase on unprotected sectors */
	for (sect = s_first; sect<=s_last; sect++) {
		if (info->protect[sect] == 0) {	/* not protected */
			addr = (vu_char*)(info->start[sect]);
			addr[0] = 0x30;
			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_char*)(info->start[l_sect]);
	while ((addr[0] & 0x80) != 0x80) {
		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_char *)info->start[0];
	addr[0] = 0xF0;	/* 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)
{
	int rc;

	while (cnt > 0) {
		if ((rc = write_byte(info, addr++, *src++)) != 0) {
			return (rc);
		}
		--cnt;
	}

	return (0);
}

/*-----------------------------------------------------------------------
 * Write a word to Flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 */
static int write_byte (flash_info_t *info, ulong dest, uchar data)
{
	vu_char *addr = (vu_char*)(info->start[0]);
	ulong start;
	int flag;

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

	addr[0x0AAA] = 0xAA;
	addr[0x0555] = 0x55;
	addr[0x0AAA] = 0xA0;

	*((vu_char *)dest) = data;

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

	/* data polling for D7 */
	start = get_timer (0);
	while ((*((vu_char *)dest) & 0x80) != (data & 0x80)) {
		if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
			return (1);
		}
	}
	return (0);
}

/*-----------------------------------------------------------------------
 */
Commit	Line	Data
affae2bf WD	1	/*
	2	* (C) Copyright 2000
	3	* Wolfgang Denk, DENX Software Engineering, [email protected].
	4	*
	5	* See file CREDITS for list of people who contributed to this
	6	* project.
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License as
	10	* published by the Free Software Foundation; either version 2 of
	11	* the License, or (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	21	* MA 02111-1307 USA
	22	*/
	23
	24	#include <common.h>
	25	#include <mpc8xx.h>
	26
	27	flash_info_t flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips */
	28
	29	/*-----------------------------------------------------------------------
	30	* Functions
	31	*/
	32	static ulong flash_get_size (vu_long addr, flash_info_t info);
	33	static int write_byte (flash_info_t *info, ulong dest, uchar data);
	34	static void flash_get_offsets (ulong base, flash_info_t *info);
	35
	36	/*-----------------------------------------------------------------------
	37	*/
	38
	39	unsigned long flash_init (void)
	40	{
	41	volatile immap_t immap = (immap_t )CFG_IMMR;
	42	volatile memctl8xx_t *memctl = &immap->im_memctl;
	43	unsigned long size;
	44	int i;
	45
	46	/* Init: no FLASHes known */
	47	for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
	48	flash_info[i].flash_id = FLASH_UNKNOWN;
	49	}
	50
	51	/* Static FLASH Bank configuration here - FIXME XXX */
	52
	53	size = flash_get_size((vu_long *)FLASH_BASE0_PRELIM, &flash_info[0]);
	54
	55	if (flash_info[0].flash_id == FLASH_UNKNOWN) {
	56	printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
	57	size, size<<20);
	58	}
	59
	60	/* Remap FLASH according to real size */
	61	memctl->memc_or0 = CFG_OR_TIMING_FLASH \| (-size & 0xFFFF8000);
	62	memctl->memc_br0 = (CFG_FLASH_BASE & BR_BA_MSK) \|
	63	(memctl->memc_br0 & ~(BR_BA_MSK));
	64
65	/* Re-do sizing to get full correct info */
66	size = flash_get_size((vu_long *)CFG_FLASH_BASE, &flash_info[0]);
67
68	flash_get_offsets (CFG_FLASH_BASE, &flash_info[0]);
69
70	#if CFG_MONITOR_BASE >= CFG_FLASH_BASE
71	/* monitor protection ON by default */
72	flash_protect(FLAG_PROTECT_SET,
73	CFG_MONITOR_BASE,
3b57fe0a	74	CFG_MONITOR_BASE+monitor_flash_len-1,
affae2bf WD	75	&flash_info[0]);
	76	#endif
	77
	78	flash_info[0].size = size;
	79
	80	return (size);
	81	}
	82
	83	/*-----------------------------------------------------------------------
	84	*/
	85	static void flash_get_offsets (ulong base, flash_info_t *info)
	86	{
	87	int i;
	88
	89	/* set up sector start address table */
	90	if (info->flash_id & FLASH_BTYPE) {
	91	/* set sector offsets for bottom boot block type */
	92	info->start[0] = base + 0x00000000;
	93	info->start[1] = base + 0x00004000;
	94	info->start[2] = base + 0x00006000;
	95	info->start[3] = base + 0x00008000;
	96	for (i = 4; i < info->sector_count; i++) {
	97	info->start[i] = base + (i * 0x00010000) - 0x00030000;
	98	}
	99	} else {
	100	/* set sector offsets for top boot block type */
	101	i = info->sector_count - 1;
	102	info->start[i--] = base + info->size - 0x00004000;
	103	info->start[i--] = base + info->size - 0x00006000;
	104	info->start[i--] = base + info->size - 0x00008000;
	105	for (; i >= 0; i--) {
	106	info->start[i] = base + i * 0x00010000;
	107	}
	108	}
	109
	110	}
	111
	112	/*-----------------------------------------------------------------------
	113	*/
	114	void flash_print_info (flash_info_t *info)
	115	{
	116	int i;
	117
	118	if (info->flash_id == FLASH_UNKNOWN) {
	119	printf ("missing or unknown FLASH type\n");
	120	return;
	121	}
	122
	123	switch (info->flash_id & FLASH_VENDMASK) {
	124	case FLASH_MAN_AMD: printf ("AMD "); break;
	125	case FLASH_MAN_FUJ: printf ("FUJITSU "); break;
	126	default: printf ("Unknown Vendor "); break;
	127	}
	128
	129	switch (info->flash_id & FLASH_TYPEMASK) {
	130	case FLASH_AM400B: printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
	131	break;
	132	case FLASH_AM400T: printf ("AM29LV400T (4 Mbit, top boot sector)\n");
	133	break;
	134	case FLASH_AM800B: printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
	135	break;
	136	case FLASH_AM800T: printf ("AM29LV800T (8 Mbit, top boot sector)\n");
	137	break;
	138	case FLASH_AM160B: printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
139	break;
140	case FLASH_AM160T: printf ("AM29LV160T (16 Mbit, top boot sector)\n");
141	break;
142	case FLASH_AM320B: printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
143	break;
144	case FLASH_AM320T: printf ("AM29LV320T (32 Mbit, top boot sector)\n");
145	break;
146	default: printf ("Unknown Chip Type\n");
147	break;
148	}
149
150	printf (" Size: %ld MB in %d Sectors\n",
151	info->size >> 20, info->sector_count);
152
153	printf (" Sector Start Addresses:");
154	for (i=0; i<info->sector_count; ++i) {
155	if ((i % 5) == 0)
156	printf ("\n ");
157	printf (" %08lX%s",
158	info->start[i],
159	info->protect[i] ? " (RO)" : " "
160	);
161	}
162	printf ("\n");
163	return;
164	}
165
166	/*-----------------------------------------------------------------------
167	*/
168
169
170	/*-----------------------------------------------------------------------
171	*/
172
173	/*
174	* The following code cannot be run from FLASH!
175	*/
176
177	static ulong flash_get_size (vu_long addr, flash_info_t info)
178	{
179	short i;
180	uchar value;
181	vu_char caddr = (vu_char )addr;
182	ulong base = (ulong)addr;
183
184
185	/* Write auto select command: read Manufacturer ID */
186	caddr[0x0AAA] = 0xAA;
187	caddr[0x0555] = 0x55;
188	caddr[0x0AAA] = 0x90;
189
190	value = caddr[0];
191	switch (value) {
192	case (AMD_MANUFACT & 0xFF):
193	info->flash_id = FLASH_MAN_AMD;
194	break;
195	case (FUJ_MANUFACT & 0xFF):
196	info->flash_id = FLASH_MAN_FUJ;
197	break;
198	default:
199	info->flash_id = FLASH_UNKNOWN;
200	info->sector_count = 0;
201	info->size = 0;
202	return (0); /* no or unknown flash */
203	}
204
205	value = caddr[2]; /* device ID */
206
207	switch (value) {
208	case (AMD_ID_LV400T & 0xFF):
209	info->flash_id += FLASH_AM400T;
210	info->sector_count = 11;
211	info->size = 0x00080000;
212	break; /* => 512 kB */
213
214	case (AMD_ID_LV400B & 0xFF):
215	info->flash_id += FLASH_AM400B;
216	info->sector_count = 11;
217	info->size = 0x00080000;
218	break; /* => 512 kB */
219
220	case (AMD_ID_LV800T & 0xFF):
221	info->flash_id += FLASH_AM800T;
222	info->sector_count = 19;
223	info->size = 0x00100000;
224	break; /* => 1 MB */
225
226	case (AMD_ID_LV800B & 0xFF):
227	info->flash_id += FLASH_AM800B;
228	info->sector_count = 19;
229	info->size = 0x00100000;
230	break; /* => 1 MB */
231
232	case (AMD_ID_LV160T & 0xFF):
233	info->flash_id += FLASH_AM160T;
234	info->sector_count = 35;
235	info->size = 0x00200000;
236	break; /* => 2 MB */
237
238	case (AMD_ID_LV160B & 0xFF):
239	info->flash_id += FLASH_AM160B;
240	info->sector_count = 35;
241	info->size = 0x00200000;
242	break; /* => 2 MB */
243	#if 0 /* enable when device IDs are available */
244	case (AMD_ID_LV320T & 0xFF):
245	info->flash_id += FLASH_AM320T;
246	info->sector_count = 67;
247	info->size = 0x00400000;
248	break; /* => 4 MB */
249
250	case (AMD_ID_LV320B & 0xFF):
251	info->flash_id += FLASH_AM320B;
252	info->sector_count = 67;
253	info->size = 0x00400000;
254	break; /* => 4 MB */
255	#endif
256	default:
257	info->flash_id = FLASH_UNKNOWN;
258	return (0); /* => no or unknown flash */
259
260	}
261
262	/* set up sector start address table */
263	if (info->flash_id & FLASH_BTYPE) {
264	/* set sector offsets for bottom boot block type */
265	info->start[0] = base + 0x00000000;
266	info->start[1] = base + 0x00004000;
267	info->start[2] = base + 0x00006000;
268	info->start[3] = base + 0x00008000;
269	for (i = 4; i < info->sector_count; i++) {
270	info->start[i] = base + (i * 0x00010000) - 0x00030000;
271	}
272	} else {
273	/* set sector offsets for top boot block type */
274	i = info->sector_count - 1;
275	info->start[i--] = base + info->size - 0x00004000;
276	info->start[i--] = base + info->size - 0x00006000;
277	info->start[i--] = base + info->size - 0x00008000;
278	for (; i >= 0; i--) {
279	info->start[i] = base + i * 0x00010000;
280	}
281	}
282
283	/* check for protected sectors */
284	for (i = 0; i < info->sector_count; i++) {
285	/* read sector protection: D0 = 1 if protected */
286	caddr = (volatile unsigned char *)(info->start[i]);
287	info->protect[i] = caddr[4] & 1;
288	}
289
290	/*
291	* Prevent writes to uninitialized FLASH.
292	*/
293	if (info->flash_id != FLASH_UNKNOWN) {
294	caddr = (vu_char *)info->start[0];
295
296	caddr = 0xF0; / reset bank */
297	}
298
299	return (info->size);
300	}
301
302
303	/*-----------------------------------------------------------------------
304	*/
305
306	int flash_erase (flash_info_t *info, int s_first, int s_last)
307	{
308	vu_char addr = (vu_char)(info->start[0]);
309	int flag, prot, sect, l_sect;
310	ulong start, now, last;
311
312	if ((s_first < 0) \|\| (s_first > s_last)) {
313	if (info->flash_id == FLASH_UNKNOWN) {
314	printf ("- missing\n");
315	} else {
316	printf ("- no sectors to erase\n");
317	}
318	return 1;
319	}
320
321	if ((info->flash_id == FLASH_UNKNOWN) \|\|
322	(info->flash_id > FLASH_AMD_COMP)) {
323	printf ("Can't erase unknown flash type %08lx - aborted\n",
324	info->flash_id);
325	return 1;
326	}
327
328	prot = 0;
329	for (sect=s_first; sect<=s_last; ++sect) {
330	if (info->protect[sect]) {
331	prot++;
332	}
333	}
334
335	if (prot) {
336	printf ("- Warning: %d protected sectors will not be erased!\n",
337	prot);
338	} else {
339	printf ("\n");
340	}
341
342	l_sect = -1;
343
344	/* Disable interrupts which might cause a timeout here */
345	flag = disable_interrupts();
346
347	addr[0x0AAA] = 0xAA;
348	addr[0x0555] = 0x55;
349	addr[0x0AAA] = 0x80;
350	addr[0x0AAA] = 0xAA;
351	addr[0x0555] = 0x55;
352
353	/* Start erase on unprotected sectors */
354	for (sect = s_first; sect<=s_last; sect++) {
355	if (info->protect[sect] == 0) { /* not protected */
356	addr = (vu_char*)(info->start[sect]);
357	addr[0] = 0x30;
358	l_sect = sect;
359	}
360	}
361
362	/* re-enable interrupts if necessary */
363	if (flag)
364	enable_interrupts();
365
366	/* wait at least 80us - let's wait 1 ms */
367	udelay (1000);
368
369	/*
370	* We wait for the last triggered sector
371	*/
372	if (l_sect < 0)
373	goto DONE;
374
375	start = get_timer (0);
376	last = start;
377	addr = (vu_char*)(info->start[l_sect]);
378	while ((addr[0] & 0x80) != 0x80) {
379	if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
380	printf ("Timeout\n");
381	return 1;
382	}
383	/* show that we're waiting */
384	if ((now - last) > 1000) { /* every second */
385	putc ('.');
386	last = now;
387	}
388	}
389
390	DONE:
391	/* reset to read mode */
392	addr = (vu_char *)info->start[0];
393	addr[0] = 0xF0; /* reset bank */
394
395	printf (" done\n");
396	return 0;
397	}
398
399	/*-----------------------------------------------------------------------
400	* Copy memory to flash, returns:
401	* 0 - OK
402	* 1 - write timeout
403	* 2 - Flash not erased
404	*/
405
406	int write_buff (flash_info_t info, uchar src, ulong addr, ulong cnt)
407	{
408	int rc;
409
410	while (cnt > 0) {
411	if ((rc = write_byte(info, addr++, *src++)) != 0) {
412	return (rc);
413	}
414	--cnt;
415	}
416
417	return (0);
418	}
419
420	/*-----------------------------------------------------------------------
421	* Write a word to Flash, returns:
422	* 0 - OK
423	* 1 - write timeout
424	* 2 - Flash not erased
425	*/
426	static int write_byte (flash_info_t *info, ulong dest, uchar data)
427	{
428	vu_char addr = (vu_char)(info->start[0]);
429	ulong start;
430	int flag;
431
432	/* Check if Flash is (sufficiently) erased */
433	if ((((vu_char )dest) & data) != data) {
434	return (2);
435	}
436	/* Disable interrupts which might cause a timeout here */
437	flag = disable_interrupts();
438
439	addr[0x0AAA] = 0xAA;
440	addr[0x0555] = 0x55;
441	addr[0x0AAA] = 0xA0;
442
443	((vu_char )dest) = data;
444
445	/* re-enable interrupts if necessary */
446	if (flag)
447	enable_interrupts();
448
449	/* data polling for D7 */
450	start = get_timer (0);
451	while ((((vu_char )dest) & 0x80) != (data & 0x80)) {
452	if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
453	return (1);
454	}
455	}
456	return (0);
457	}
458
459	/*-----------------------------------------------------------------------
460	*/