[people/ms/u-boot.git] / common / cmd_eeprom.c

/*
 * (C) Copyright 2000, 2001
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 *
 */

#include <common.h>
#include <config.h>
#include <command.h>
#include <i2c.h>

#if (CONFIG_COMMANDS & CFG_CMD_EEPROM) || defined(CFG_ENV_IS_IN_EEPROM)

extern void eeprom_init  (void);
extern int  eeprom_read  (unsigned dev_addr, unsigned offset,
			  uchar *buffer, unsigned cnt);
extern int  eeprom_write (unsigned dev_addr, unsigned offset,
			  uchar *buffer, unsigned cnt);
#endif


#if defined(CFG_EEPROM_X40430)
	/* Maximum number of times to poll for acknowledge after write */
#define MAX_ACKNOWLEDGE_POLLS	10
#endif

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

#if (CONFIG_COMMANDS & CFG_CMD_EEPROM)
int do_eeprom ( cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
{
	const char *const fmt =
		"\nEEPROM @0x%lX %s: addr %08lx  off %04lx  count %ld ... ";

#if defined(CFG_I2C_MULTI_EEPROMS)
	if (argc == 6) {
		ulong dev_addr = simple_strtoul (argv[2], NULL, 16);
		ulong addr = simple_strtoul (argv[3], NULL, 16);
		ulong off  = simple_strtoul (argv[4], NULL, 16);
		ulong cnt  = simple_strtoul (argv[5], NULL, 16);
#else
	if (argc == 5) {
		ulong dev_addr = CFG_DEF_EEPROM_ADDR;
		ulong addr = simple_strtoul (argv[2], NULL, 16);
		ulong off  = simple_strtoul (argv[3], NULL, 16);
		ulong cnt  = simple_strtoul (argv[4], NULL, 16);
#endif /* CFG_I2C_MULTI_EEPROMS */

# ifndef CONFIG_SPI
		eeprom_init ();
# endif /* !CONFIG_SPI */

		if (strcmp (argv[1], "read") == 0) {
			int rcode;

			printf (fmt, dev_addr, argv[1], addr, off, cnt);

			rcode = eeprom_read (dev_addr, off, (uchar *) addr, cnt);

			printf ("done\n");
			return rcode;
		} else if (strcmp (argv[1], "write") == 0) {
			int rcode;

			printf (fmt, dev_addr, argv[1], addr, off, cnt);

			rcode = eeprom_write (dev_addr, off, (uchar *) addr, cnt);

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

	printf ("Usage:\n%s\n", cmdtp->usage);
	return 1;
}
#endif	/* CFG_CMD_EEPROM */

/*-----------------------------------------------------------------------
 *
 * for CFG_I2C_EEPROM_ADDR_LEN == 2 (16-bit EEPROM address) offset is
 *   0x000nxxxx for EEPROM address selectors at n, offset xxxx in EEPROM.
 *
 * for CFG_I2C_EEPROM_ADDR_LEN == 1 (8-bit EEPROM page address) offset is
 *   0x00000nxx for EEPROM address selectors and page number at n.
 */

#if (CONFIG_COMMANDS & CFG_CMD_EEPROM) || defined(CFG_ENV_IS_IN_EEPROM)

#ifndef CONFIG_SPI
#if !defined(CFG_I2C_EEPROM_ADDR_LEN) || CFG_I2C_EEPROM_ADDR_LEN < 1 || CFG_I2C_EEPROM_ADDR_LEN > 2
#error CFG_I2C_EEPROM_ADDR_LEN must be 1 or 2
#endif
#endif

int eeprom_read (unsigned dev_addr, unsigned offset, uchar *buffer, unsigned cnt)
{
	unsigned end = offset + cnt;
	unsigned blk_off;
	int rcode = 0;

	/* Read data until done or would cross a page boundary.
	 * We must write the address again when changing pages
	 * because the next page may be in a different device.
	 */
	while (offset < end) {
		unsigned alen, len, maxlen;
#if CFG_I2C_EEPROM_ADDR_LEN == 1 && !defined(CONFIG_SPI_X)
		uchar addr[2];

		blk_off = offset & 0xFF;	/* block offset */

		addr[0] = offset >> 8;		/* block number */
		addr[1] = blk_off;		/* block offset */
		alen	= 2;
#else
		uchar addr[3];

		blk_off = offset & 0xFF;	/* block offset */

		addr[0] = offset >> 16;		/* block number */
		addr[1] = offset >>  8;		/* upper address octet */
		addr[2] = blk_off;		/* lower address octet */
		alen	= 3;
#endif	/* CFG_I2C_EEPROM_ADDR_LEN, CONFIG_SPI_X */

		addr[0] |= dev_addr;		/* insert device address */

		maxlen = 0x100 - blk_off;
		if (maxlen > I2C_RXTX_LEN)
			maxlen = I2C_RXTX_LEN;
		len    = end - offset;
		if (len > maxlen)
			len = maxlen;
#ifdef CONFIG_SPI
		spi_read (addr, alen, buffer, len);
#else
		if (i2c_read (addr[0], offset, alen-1, buffer, len) != 0)
			rcode = 1;
#endif
		buffer += len;
		offset += len;
	}
	return rcode;
}

/*-----------------------------------------------------------------------
 *
 * for CFG_I2C_EEPROM_ADDR_LEN == 2 (16-bit EEPROM address) offset is
 *   0x000nxxxx for EEPROM address selectors at n, offset xxxx in EEPROM.
 *
 * for CFG_I2C_EEPROM_ADDR_LEN == 1 (8-bit EEPROM page address) offset is
 *   0x00000nxx for EEPROM address selectors and page number at n.
 */

int eeprom_write (unsigned dev_addr, unsigned offset, uchar *buffer, unsigned cnt)
{
	unsigned end = offset + cnt;
	unsigned blk_off;
	int rcode = 0;

#if defined(CFG_EEPROM_X40430)
	uchar	contr_r_addr[2];
	uchar	addr_void[2];
	uchar	contr_reg[2];
	uchar	ctrl_reg_v;
	int	i;
#endif

	/* Write data until done or would cross a write page boundary.
	 * We must write the address again when changing pages
	 * because the address counter only increments within a page.
	 */

	while (offset < end) {
		unsigned alen, len, maxlen;
#if CFG_I2C_EEPROM_ADDR_LEN == 1 && !defined(CONFIG_SPI_X)
		uchar addr[2];

		blk_off = offset & 0xFF;	/* block offset */

		addr[0] = offset >> 8;		/* block number */
		addr[1] = blk_off;		/* block offset */
		alen	= 2;
#else
		uchar addr[3];

		blk_off = offset & 0xFF;	/* block offset */

		addr[0] = offset >> 16;		/* block number */
		addr[1] = offset >>  8;		/* upper address octet */
		addr[2] = blk_off;		/* lower address octet */
		alen	= 3;
#endif	/* CFG_I2C_EEPROM_ADDR_LEN, CONFIG_SPI_X */

		addr[0] |= dev_addr;		/* insert device address */

#if defined(CFG_EEPROM_PAGE_WRITE_BITS)

#define	EEPROM_PAGE_SIZE	(1 << CFG_EEPROM_PAGE_WRITE_BITS)
#define	EEPROM_PAGE_OFFSET(x)	((x) & (EEPROM_PAGE_SIZE - 1))

		maxlen = EEPROM_PAGE_SIZE - EEPROM_PAGE_OFFSET(blk_off);
#else
		maxlen = 0x100 - blk_off;
#endif
		if (maxlen > I2C_RXTX_LEN)
			maxlen = I2C_RXTX_LEN;

		len = end - offset;
		if (len > maxlen)
			len = maxlen;
#ifdef CONFIG_SPI
		spi_write (addr, alen, buffer, len);
#else
#if defined(CFG_EEPROM_X40430)
		/* Get the value of the control register.
		 * Set current address (internal pointer in the x40430)
		 * to 0x1ff.
		 */
		contr_r_addr[0] = 9;
		contr_r_addr[1] = 0xff;
		addr_void[0]    = 0;
		addr_void[1]    = addr[1];
#ifdef CFG_I2C_EEPROM_ADDR
		contr_r_addr[0] |= CFG_I2C_EEPROM_ADDR;
		addr_void[0]    |= CFG_I2C_EEPROM_ADDR;
#endif
		contr_reg[0] = 0xff;
		if (i2c_read (contr_r_addr[0], contr_r_addr[1], 1, contr_reg, 1) != 0) {
			rcode = 1;
		}
		ctrl_reg_v = contr_reg[0];

		/* Are any of the eeprom blocks write protected?
		 */
		if (ctrl_reg_v & 0x18) {
			ctrl_reg_v &= ~0x18;   /* reset block protect bits  */
			ctrl_reg_v |=  0x02;   /* set write enable latch    */
			ctrl_reg_v &= ~0x04;   /* clear RWEL                */

			/* Set write enable latch.
			 */
			contr_reg[0] = 0x02;
			if (i2c_write (contr_r_addr[0], 0xff, 1, contr_reg, 1) != 0) {
				rcode = 1;
			}

			/* Set register write enable latch.
			 */
			contr_reg[0] = 0x06;
			if (i2c_write (contr_r_addr[0], 0xFF, 1, contr_reg, 1) != 0) {
				rcode = 1;
			}

			/* Modify ctrl register.
			 */
			contr_reg[0] = ctrl_reg_v;
			if (i2c_write (contr_r_addr[0], 0xFF, 1, contr_reg, 1) != 0) {
				rcode = 1;
			}

			/* The write (above) is an operation on NV memory.
			 * These can take some time (~5ms), and the device
			 * will not respond to further I2C messages till
			 * it's completed the write.
			 * So poll device for an I2C acknowledge.
			 * When we get one we know we can continue with other
			 * operations.
			 */
			contr_reg[0] = 0;
			for (i = 0; i < MAX_ACKNOWLEDGE_POLLS; i++) {
				if (i2c_read (addr_void[0], addr_void[1], 1, contr_reg, 1) == 0)
					break;	/* got ack */
#if defined(CFG_EEPROM_PAGE_WRITE_DELAY_MS)
				udelay(CFG_EEPROM_PAGE_WRITE_DELAY_MS * 1000);
#endif
			}
			if (i == MAX_ACKNOWLEDGE_POLLS) {
				printf("EEPROM poll acknowledge failed\n");
				rcode = 1;
			}
		}

		/* Is the write enable latch on?.
		 */
		else if (!(ctrl_reg_v & 0x02)) {
			/* Set write enable latch.
			 */
			contr_reg[0] = 0x02;
			if (i2c_write (contr_r_addr[0], 0xFF, 1, contr_reg, 1) != 0) {
			       rcode = 1;
			}
		}
		/* Write is enabled ... now write eeprom value.
		 */
#endif
		if (i2c_write (addr[0], offset, alen-1, buffer, len) != 0)
			rcode = 1;

#endif
		buffer += len;
		offset += len;

#if defined(CFG_EEPROM_PAGE_WRITE_DELAY_MS)
		udelay(CFG_EEPROM_PAGE_WRITE_DELAY_MS * 1000);
#endif
	}
	return rcode;
}

#ifndef CONFIG_SPI
int
eeprom_probe (unsigned dev_addr, unsigned offset)
{
	unsigned char chip;

	/* Probe the chip address
	 */
#if CFG_I2C_EEPROM_ADDR_LEN == 1 && !defined(CONFIG_SPI_X)
	chip = offset >> 8;		/* block number */
#else
	chip = offset >> 16;		/* block number */
#endif	/* CFG_I2C_EEPROM_ADDR_LEN, CONFIG_SPI_X */

	chip |= dev_addr;		/* insert device address */

	return (i2c_probe (chip));
}
#endif

/*-----------------------------------------------------------------------
 * Set default values
 */
#ifndef	CFG_I2C_SPEED
#define	CFG_I2C_SPEED	50000
#endif

#ifndef	CFG_I2C_SLAVE
#define	CFG_I2C_SLAVE	0xFE
#endif

void eeprom_init  (void)
{
#if defined(CONFIG_SPI)
	spi_init_f ();
#endif
#if defined(CONFIG_HARD_I2C) || \
    defined(CONFIG_SOFT_I2C)
	i2c_init (CFG_I2C_SPEED, CFG_I2C_SLAVE);
#endif
}
/*-----------------------------------------------------------------------
 */
#endif	/* CFG_CMD_EEPROM */
/***************************************************/

#if (CONFIG_COMMANDS & CFG_CMD_EEPROM)

#ifdef CFG_I2C_MULTI_EEPROMS
U_BOOT_CMD(
	eeprom,	6,	1,	do_eeprom,
	"eeprom  - EEPROM sub-system\n",
	"read  devaddr addr off cnt\n"
	"eeprom write devaddr addr off cnt\n"
	"       - read/write `cnt' bytes from `devaddr` EEPROM at offset `off'\n"
);
#else /* One EEPROM */
U_BOOT_CMD(
	eeprom,	5,	1,	do_eeprom,
	"eeprom  - EEPROM sub-system\n",
	"read  addr off cnt\n"
	"eeprom write addr off cnt\n"
	"       - read/write `cnt' bytes at EEPROM offset `off'\n"
);
#endif /* CFG_I2C_MULTI_EEPROMS */

#endif	/* CFG_CMD_EEPROM */
Commit	Line	Data
3863585b WD	1	/*
	2	* (C) Copyright 2000, 2001
	3	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	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
	25	#include <common.h>
	26	#include <config.h>
	27	#include <command.h>
	28	#include <i2c.h>
	29
	30	#if (CONFIG_COMMANDS & CFG_CMD_EEPROM) \|\| defined(CFG_ENV_IS_IN_EEPROM)
	31
	32	extern void eeprom_init (void);
	33	extern int eeprom_read (unsigned dev_addr, unsigned offset,
	34	uchar *buffer, unsigned cnt);
	35	extern int eeprom_write (unsigned dev_addr, unsigned offset,
	36	uchar *buffer, unsigned cnt);
	37	#endif
	38
	39
	40	#if defined(CFG_EEPROM_X40430)
	41	/* Maximum number of times to poll for acknowledge after write */
	42	#define MAX_ACKNOWLEDGE_POLLS 10
	43	#endif
	44
	45	/* ------------------------------------------------------------------------- */
	46
	47	#if (CONFIG_COMMANDS & CFG_CMD_EEPROM)
	48	int do_eeprom ( cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
	49	{
	50	const char *const fmt =
	51	"\nEEPROM @0x%lX %s: addr %08lx off %04lx count %ld ... ";
	52
	53	#if defined(CFG_I2C_MULTI_EEPROMS)
	54	if (argc == 6) {
	55	ulong dev_addr = simple_strtoul (argv[2], NULL, 16);
	56	ulong addr = simple_strtoul (argv[3], NULL, 16);
	57	ulong off = simple_strtoul (argv[4], NULL, 16);
	58	ulong cnt = simple_strtoul (argv[5], NULL, 16);
	59	#else
	60	if (argc == 5) {
	61	ulong dev_addr = CFG_DEF_EEPROM_ADDR;
	62	ulong addr = simple_strtoul (argv[2], NULL, 16);
	63	ulong off = simple_strtoul (argv[3], NULL, 16);
	64	ulong cnt = simple_strtoul (argv[4], NULL, 16);
65	#endif /* CFG_I2C_MULTI_EEPROMS */
66
67	# ifndef CONFIG_SPI
68	eeprom_init ();
69	# endif /* !CONFIG_SPI */
70
71	if (strcmp (argv[1], "read") == 0) {
72	int rcode;
73
74	printf (fmt, dev_addr, argv[1], addr, off, cnt);
75
76	rcode = eeprom_read (dev_addr, off, (uchar *) addr, cnt);
77
78	printf ("done\n");
79	return rcode;
80	} else if (strcmp (argv[1], "write") == 0) {
81	int rcode;
82
83	printf (fmt, dev_addr, argv[1], addr, off, cnt);
84
85	rcode = eeprom_write (dev_addr, off, (uchar *) addr, cnt);
86
87	printf ("done\n");
88	return rcode;
89	}
90	}
91
92	printf ("Usage:\n%s\n", cmdtp->usage);
93	return 1;
94	}
95	#endif /* CFG_CMD_EEPROM */
96
97	/*-----------------------------------------------------------------------
98	*
99	* for CFG_I2C_EEPROM_ADDR_LEN == 2 (16-bit EEPROM address) offset is
100	* 0x000nxxxx for EEPROM address selectors at n, offset xxxx in EEPROM.
101	*
102	* for CFG_I2C_EEPROM_ADDR_LEN == 1 (8-bit EEPROM page address) offset is
103	* 0x00000nxx for EEPROM address selectors and page number at n.
104	*/
105
106	#if (CONFIG_COMMANDS & CFG_CMD_EEPROM) \|\| defined(CFG_ENV_IS_IN_EEPROM)
107
108	#ifndef CONFIG_SPI
109	#if !defined(CFG_I2C_EEPROM_ADDR_LEN) \|\| CFG_I2C_EEPROM_ADDR_LEN < 1 \|\| CFG_I2C_EEPROM_ADDR_LEN > 2
110	#error CFG_I2C_EEPROM_ADDR_LEN must be 1 or 2
111	#endif
112	#endif
113
114	int eeprom_read (unsigned dev_addr, unsigned offset, uchar *buffer, unsigned cnt)
115	{
116	unsigned end = offset + cnt;
117	unsigned blk_off;
118	int rcode = 0;
119
120	/* Read data until done or would cross a page boundary.
121	* We must write the address again when changing pages
122	* because the next page may be in a different device.
123	*/
124	while (offset < end) {
125	unsigned alen, len, maxlen;
126	#if CFG_I2C_EEPROM_ADDR_LEN == 1 && !defined(CONFIG_SPI_X)
127	uchar addr[2];
128
129	blk_off = offset & 0xFF; /* block offset */
130
131	addr[0] = offset >> 8; /* block number */
132	addr[1] = blk_off; /* block offset */
133	alen = 2;
134	#else
135	uchar addr[3];
136
137	blk_off = offset & 0xFF; /* block offset */
138
139	addr[0] = offset >> 16; /* block number */
140	addr[1] = offset >> 8; /* upper address octet */
141	addr[2] = blk_off; /* lower address octet */
142	alen = 3;
143	#endif /* CFG_I2C_EEPROM_ADDR_LEN, CONFIG_SPI_X */
144
145	addr[0] \|= dev_addr; /* insert device address */
146
147	maxlen = 0x100 - blk_off;
148	if (maxlen > I2C_RXTX_LEN)
149	maxlen = I2C_RXTX_LEN;
150	len = end - offset;
151	if (len > maxlen)
152	len = maxlen;
153	#ifdef CONFIG_SPI
154	spi_read (addr, alen, buffer, len);
155	#else
156	if (i2c_read (addr[0], offset, alen-1, buffer, len) != 0)
157	rcode = 1;
158	#endif
159	buffer += len;
160	offset += len;
161	}
162	return rcode;
163	}
164
165	/*-----------------------------------------------------------------------
166	*
167	* for CFG_I2C_EEPROM_ADDR_LEN == 2 (16-bit EEPROM address) offset is
168	* 0x000nxxxx for EEPROM address selectors at n, offset xxxx in EEPROM.
169	*
170	* for CFG_I2C_EEPROM_ADDR_LEN == 1 (8-bit EEPROM page address) offset is
171	* 0x00000nxx for EEPROM address selectors and page number at n.
172	*/
173
174	int eeprom_write (unsigned dev_addr, unsigned offset, uchar *buffer, unsigned cnt)
175	{
176	unsigned end = offset + cnt;
177	unsigned blk_off;
178	int rcode = 0;
179
180	#if defined(CFG_EEPROM_X40430)
181	uchar contr_r_addr[2];
182	uchar addr_void[2];
183	uchar contr_reg[2];
184	uchar ctrl_reg_v;
185	int i;
186	#endif
187
188	/* Write data until done or would cross a write page boundary.
189	* We must write the address again when changing pages
190	* because the address counter only increments within a page.
191	*/
192
193	while (offset < end) {
194	unsigned alen, len, maxlen;
195	#if CFG_I2C_EEPROM_ADDR_LEN == 1 && !defined(CONFIG_SPI_X)
196	uchar addr[2];
197
198	blk_off = offset & 0xFF; /* block offset */
199
200	addr[0] = offset >> 8; /* block number */
201	addr[1] = blk_off; /* block offset */
202	alen = 2;
203	#else
204	uchar addr[3];
205
206	blk_off = offset & 0xFF; /* block offset */
207
208	addr[0] = offset >> 16; /* block number */
209	addr[1] = offset >> 8; /* upper address octet */
210	addr[2] = blk_off; /* lower address octet */
211	alen = 3;
212	#endif /* CFG_I2C_EEPROM_ADDR_LEN, CONFIG_SPI_X */
213
214	addr[0] \|= dev_addr; /* insert device address */
215
216	#if defined(CFG_EEPROM_PAGE_WRITE_BITS)
217
218	#define EEPROM_PAGE_SIZE (1 << CFG_EEPROM_PAGE_WRITE_BITS)
219	#define EEPROM_PAGE_OFFSET(x) ((x) & (EEPROM_PAGE_SIZE - 1))
220
221	maxlen = EEPROM_PAGE_SIZE - EEPROM_PAGE_OFFSET(blk_off);
222	#else
223	maxlen = 0x100 - blk_off;
224	#endif
225	if (maxlen > I2C_RXTX_LEN)
226	maxlen = I2C_RXTX_LEN;
227
228	len = end - offset;
229	if (len > maxlen)
230	len = maxlen;
231	#ifdef CONFIG_SPI
232	spi_write (addr, alen, buffer, len);
233	#else
234	#if defined(CFG_EEPROM_X40430)
235	/* Get the value of the control register.
236	* Set current address (internal pointer in the x40430)
237	* to 0x1ff.
238	*/
239	contr_r_addr[0] = 9;
240	contr_r_addr[1] = 0xff;
241	addr_void[0] = 0;
242	addr_void[1] = addr[1];
243	#ifdef CFG_I2C_EEPROM_ADDR
244	contr_r_addr[0] \|= CFG_I2C_EEPROM_ADDR;
245	addr_void[0] \|= CFG_I2C_EEPROM_ADDR;
246	#endif
247	contr_reg[0] = 0xff;
248	if (i2c_read (contr_r_addr[0], contr_r_addr[1], 1, contr_reg, 1) != 0) {
249	rcode = 1;
250	}
251	ctrl_reg_v = contr_reg[0];
252
253	/* Are any of the eeprom blocks write protected?
254	*/
255	if (ctrl_reg_v & 0x18) {
256	ctrl_reg_v &= ~0x18; /* reset block protect bits */
257	ctrl_reg_v \|= 0x02; /* set write enable latch */
258	ctrl_reg_v &= ~0x04; /* clear RWEL */
259
260	/* Set write enable latch.
261	*/
262	contr_reg[0] = 0x02;
263	if (i2c_write (contr_r_addr[0], 0xff, 1, contr_reg, 1) != 0) {
264	rcode = 1;
265	}
266
267	/* Set register write enable latch.
268	*/
269	contr_reg[0] = 0x06;
270	if (i2c_write (contr_r_addr[0], 0xFF, 1, contr_reg, 1) != 0) {
271	rcode = 1;
272	}
273
274	/* Modify ctrl register.
275	*/
276	contr_reg[0] = ctrl_reg_v;
277	if (i2c_write (contr_r_addr[0], 0xFF, 1, contr_reg, 1) != 0) {
278	rcode = 1;
279	}
280
281	/* The write (above) is an operation on NV memory.
282	* These can take some time (~5ms), and the device
283	* will not respond to further I2C messages till
284	* it's completed the write.
285	* So poll device for an I2C acknowledge.
286	* When we get one we know we can continue with other
287	* operations.
288	*/
289	contr_reg[0] = 0;
290	for (i = 0; i < MAX_ACKNOWLEDGE_POLLS; i++) {
aacf9a49	291	if (i2c_read (addr_void[0], addr_void[1], 1, contr_reg, 1) == 0)
3863585b WD	292	break; /* got ack */
	293	#if defined(CFG_EEPROM_PAGE_WRITE_DELAY_MS)
	294	udelay(CFG_EEPROM_PAGE_WRITE_DELAY_MS * 1000);
	295	#endif
	296	}
	297	if (i == MAX_ACKNOWLEDGE_POLLS) {
	298	printf("EEPROM poll acknowledge failed\n");
	299	rcode = 1;
	300	}
	301	}
	302
	303	/* Is the write enable latch on?.
	304	*/
	305	else if (!(ctrl_reg_v & 0x02)) {
	306	/* Set write enable latch.
	307	*/
	308	contr_reg[0] = 0x02;
	309	if (i2c_write (contr_r_addr[0], 0xFF, 1, contr_reg, 1) != 0) {
	310	rcode = 1;
	311	}
	312	}
	313	/* Write is enabled ... now write eeprom value.
	314	*/
	315	#endif
	316	if (i2c_write (addr[0], offset, alen-1, buffer, len) != 0)
	317	rcode = 1;
	318
	319	#endif
	320	buffer += len;
	321	offset += len;
	322
	323	#if defined(CFG_EEPROM_PAGE_WRITE_DELAY_MS)
	324	udelay(CFG_EEPROM_PAGE_WRITE_DELAY_MS * 1000);
	325	#endif
	326	}
	327	return rcode;
	328	}
	329
6dd652fa WD	330	#ifndef CONFIG_SPI
	331	int
	332	eeprom_probe (unsigned dev_addr, unsigned offset)
	333	{
	334	unsigned char chip;
	335
	336	/* Probe the chip address
	337	*/
	338	#if CFG_I2C_EEPROM_ADDR_LEN == 1 && !defined(CONFIG_SPI_X)
	339	chip = offset >> 8; /* block number */
	340	#else
	341	chip = offset >> 16; /* block number */
	342	#endif /* CFG_I2C_EEPROM_ADDR_LEN, CONFIG_SPI_X */
	343
	344	chip \|= dev_addr; /* insert device address */
	345
	346	return (i2c_probe (chip));
	347	}
	348	#endif
	349
3863585b WD	350	/*-----------------------------------------------------------------------
	351	* Set default values
	352	*/
	353	#ifndef CFG_I2C_SPEED
	354	#define CFG_I2C_SPEED 50000
	355	#endif
	356
	357	#ifndef CFG_I2C_SLAVE
	358	#define CFG_I2C_SLAVE 0xFE
	359	#endif
	360
	361	void eeprom_init (void)
	362	{
	363	#if defined(CONFIG_SPI)
	364	spi_init_f ();
	365	#endif
	366	#if defined(CONFIG_HARD_I2C) \|\| \
	367	defined(CONFIG_SOFT_I2C)
	368	i2c_init (CFG_I2C_SPEED, CFG_I2C_SLAVE);
	369	#endif
	370	}
	371	/*-----------------------------------------------------------------------
	372	*/
	373	#endif /* CFG_CMD_EEPROM */
8bde7f77 WD	374	/***************************************************/
	375
	376	#if (CONFIG_COMMANDS & CFG_CMD_EEPROM)
	377
	378	#ifdef CFG_I2C_MULTI_EEPROMS
0d498393 WD	379	U_BOOT_CMD(
0d498393 WD	380	eeprom, 6, 1, do_eeprom,
8bde7f77 WD	381	"eeprom - EEPROM sub-system\n",
	382	"read devaddr addr off cnt\n"
	383	"eeprom write devaddr addr off cnt\n"
	384	" - read/write `cnt' bytes from `devaddr` EEPROM at offset `off'\n"
	385	);
	386	#else /* One EEPROM */
0d498393 WD	387	U_BOOT_CMD(
0d498393 WD	388	eeprom, 5, 1, do_eeprom,
8bde7f77 WD	389	"eeprom - EEPROM sub-system\n",
	390	"read addr off cnt\n"
	391	"eeprom write addr off cnt\n"
	392	" - read/write `cnt' bytes at EEPROM offset `off'\n"
	393	);
	394	#endif /* CFG_I2C_MULTI_EEPROMS */
	395
	396	#endif /* CFG_CMD_EEPROM */