summaryrefslogtreecommitdiff
path: root/drivers/mtd/at45.c
blob: dac987a43a569891943531b6325d540c35c5cf0f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
/* Driver for ATMEL DataFlash support
 * Author : Hamid Ikdoumi (Atmel)
 *
 * 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 <config.h>
#include <common.h>

#ifdef CONFIG_HAS_DATAFLASH
#include <dataflash.h>

/*
 * spi.c API
 */
extern unsigned int AT91F_SpiWrite(AT91PS_DataflashDesc pDesc);
extern void AT91F_SpiEnable(int cs);

#define AT91C_TIMEOUT_WRDY			200000

/*----------------------------------------------------------------------*/
/* \fn    AT91F_DataFlashSendCommand					*/
/* \brief Generic function to send a command to the dataflash		*/
/*----------------------------------------------------------------------*/
AT91S_DataFlashStatus AT91F_DataFlashSendCommand(AT91PS_DataFlash pDataFlash,
						 unsigned char OpCode,
						 unsigned int CmdSize,
						 unsigned int DataflashAddress)
{
	unsigned int adr;

	if ((pDataFlash->pDataFlashDesc->state) != IDLE)
		return DATAFLASH_BUSY;

	/* process the address to obtain page address and byte address */
	adr = ((DataflashAddress / (pDataFlash->pDevice->pages_size)) <<
		pDataFlash->pDevice->page_offset) +
			(DataflashAddress % (pDataFlash->pDevice->pages_size));

	/* fill the command buffer */
	pDataFlash->pDataFlashDesc->command[0] = OpCode;
	if (pDataFlash->pDevice->pages_number >= 16384) {
		pDataFlash->pDataFlashDesc->command[1] =
			(unsigned char)((adr & 0x0F000000) >> 24);
		pDataFlash->pDataFlashDesc->command[2] =
			(unsigned char)((adr & 0x00FF0000) >> 16);
		pDataFlash->pDataFlashDesc->command[3] =
			(unsigned char)((adr & 0x0000FF00) >> 8);
		pDataFlash->pDataFlashDesc->command[4] =
			(unsigned char)(adr & 0x000000FF);
	} else {
		pDataFlash->pDataFlashDesc->command[1] =
			(unsigned char)((adr & 0x00FF0000) >> 16);
		pDataFlash->pDataFlashDesc->command[2] =
			(unsigned char)((adr & 0x0000FF00) >> 8);
		pDataFlash->pDataFlashDesc->command[3] =
			(unsigned char)(adr & 0x000000FF);
		pDataFlash->pDataFlashDesc->command[4] = 0;
	}
	pDataFlash->pDataFlashDesc->command[5] = 0;
	pDataFlash->pDataFlashDesc->command[6] = 0;
	pDataFlash->pDataFlashDesc->command[7] = 0;

	/* Initialize the SpiData structure for the spi write fuction */
	pDataFlash->pDataFlashDesc->tx_cmd_pt =
		pDataFlash->pDataFlashDesc->command;
	pDataFlash->pDataFlashDesc->tx_cmd_size = CmdSize;
	pDataFlash->pDataFlashDesc->rx_cmd_pt =
		pDataFlash->pDataFlashDesc->command;
	pDataFlash->pDataFlashDesc->rx_cmd_size = CmdSize;

	/* send the command and read the data */
	return AT91F_SpiWrite(pDataFlash->pDataFlashDesc);
}

/*----------------------------------------------------------------------*/
/* \fn    AT91F_DataFlashGetStatus					*/
/* \brief Read the status register of the dataflash			*/
/*----------------------------------------------------------------------*/
AT91S_DataFlashStatus AT91F_DataFlashGetStatus(AT91PS_DataflashDesc pDesc)
{
	AT91S_DataFlashStatus status;

	/* if a transfert is in progress ==> return 0 */
	if ((pDesc->state) != IDLE)
		return DATAFLASH_BUSY;

	/* first send the read status command (D7H) */
	pDesc->command[0] = DB_STATUS;
	pDesc->command[1] = 0;

	pDesc->DataFlash_state = GET_STATUS;
	pDesc->tx_data_size = 0;	/* Transmit the command */
	/* and receive response */
	pDesc->tx_cmd_pt = pDesc->command;
	pDesc->rx_cmd_pt = pDesc->command;
	pDesc->rx_cmd_size = 2;
	pDesc->tx_cmd_size = 2;
	status = AT91F_SpiWrite(pDesc);

	pDesc->DataFlash_state = *((unsigned char *)(pDesc->rx_cmd_pt) + 1);

	return status;
}

/*----------------------------------------------------------------------*/
/* \fn    AT91F_DataFlashWaitReady					*/
/* \brief wait for dataflash ready (bit7 of the status register == 1)	*/
/*----------------------------------------------------------------------*/
AT91S_DataFlashStatus AT91F_DataFlashWaitReady(AT91PS_DataflashDesc
						pDataFlashDesc,
						unsigned int timeout)
{
	pDataFlashDesc->DataFlash_state = IDLE;

	do {
		AT91F_DataFlashGetStatus(pDataFlashDesc);
		timeout--;
	} while (((pDataFlashDesc->DataFlash_state & 0x80) != 0x80) &&
		 (timeout > 0));

	if ((pDataFlashDesc->DataFlash_state & 0x80) != 0x80)
		return DATAFLASH_ERROR;

	return DATAFLASH_OK;
}

/*--------------------------------------------------------------------------*/
/* Function Name       : AT91F_DataFlashContinuousRead 			    */
/* Object              : Continuous stream Read 			    */
/* Input Parameters    : DataFlash Service				    */
/*						: <src> = dataflash address */
/*                     : <*dataBuffer> = data buffer pointer		    */
/*                     : <sizeToRead> = data buffer size		    */
/* Return value		: State of the dataflash			    */
/*--------------------------------------------------------------------------*/
AT91S_DataFlashStatus AT91F_DataFlashContinuousRead(
				AT91PS_DataFlash pDataFlash,
				int src,
				unsigned char *dataBuffer,
				int sizeToRead)
{
	AT91S_DataFlashStatus status;
	/* Test the size to read in the device */
	if ((src + sizeToRead) >
			(pDataFlash->pDevice->pages_size *
				(pDataFlash->pDevice->pages_number)))
		return DATAFLASH_MEMORY_OVERFLOW;

	pDataFlash->pDataFlashDesc->rx_data_pt = dataBuffer;
	pDataFlash->pDataFlashDesc->rx_data_size = sizeToRead;
	pDataFlash->pDataFlashDesc->tx_data_pt = dataBuffer;
	pDataFlash->pDataFlashDesc->tx_data_size = sizeToRead;

	status = AT91F_DataFlashSendCommand(
			pDataFlash, DB_CONTINUOUS_ARRAY_READ, 8, src);
	/* Send the command to the dataflash */
	return (status);
}

/*---------------------------------------------------------------------------*/
/* Function Name       : AT91F_DataFlashPagePgmBuf			     */
/* Object              : Main memory page program thru buffer 1 or buffer 2  */
/* Input Parameters    : DataFlash Service				     */
/*						: <*src> = Source buffer     */
/*                     : <dest> = dataflash destination address		     */
/*                     : <SizeToWrite> = data buffer size		     */
/* Return value		: State of the dataflash			     */
/*---------------------------------------------------------------------------*/
AT91S_DataFlashStatus AT91F_DataFlashPagePgmBuf(AT91PS_DataFlash pDataFlash,
						unsigned char *src,
						unsigned int dest,
						unsigned int SizeToWrite)
{
	int cmdsize;
	pDataFlash->pDataFlashDesc->tx_data_pt = src;
	pDataFlash->pDataFlashDesc->tx_data_size = SizeToWrite;
	pDataFlash->pDataFlashDesc->rx_data_pt = src;
	pDataFlash->pDataFlashDesc->rx_data_size = SizeToWrite;

	cmdsize = 4;
	/* Send the command to the dataflash */
	if (pDataFlash->pDevice->pages_number >= 16384)
		cmdsize = 5;
	return (AT91F_DataFlashSendCommand(
			pDataFlash, DB_PAGE_PGM_BUF1, cmdsize, dest));
}

/*---------------------------------------------------------------------------*/
/* Function Name       : AT91F_MainMemoryToBufferTransfert		     */
/* Object              : Read a page in the SRAM Buffer 1 or 2		     */
/* Input Parameters    : DataFlash Service				     */
/*                     : Page concerned					     */
/*                     : 						     */
/* Return value		: State of the dataflash			     */
/*---------------------------------------------------------------------------*/
AT91S_DataFlashStatus AT91F_MainMemoryToBufferTransfert(
					AT91PS_DataFlash
					pDataFlash,
					unsigned char
					BufferCommand,
					unsigned int page)
{
	int cmdsize;
	/* Test if the buffer command is legal */
	if ((BufferCommand != DB_PAGE_2_BUF1_TRF) &&
			(BufferCommand != DB_PAGE_2_BUF2_TRF)) {
		return DATAFLASH_BAD_COMMAND;
	}

	/* no data to transmit or receive */
	pDataFlash->pDataFlashDesc->tx_data_size = 0;
	cmdsize = 4;
	if (pDataFlash->pDevice->pages_number >= 16384)
		cmdsize = 5;
	return (AT91F_DataFlashSendCommand(
			pDataFlash, BufferCommand, cmdsize,
			page * pDataFlash->pDevice->pages_size));
}

/*-------------------------------------------------------------------------- */
/* Function Name       : AT91F_DataFlashWriteBuffer			     */
/* Object              : Write data to the internal sram buffer 1 or 2	     */
/* Input Parameters    : DataFlash Service				     */
/*			: <BufferCommand> = command to write buffer1 or 2    */
/*                     : <*dataBuffer> = data buffer to write		     */
/*                     : <bufferAddress> = address in the internal buffer    */
/*                     : <SizeToWrite> = data buffer size		     */
/* Return value		: State of the dataflash			     */
/*---------------------------------------------------------------------------*/
AT91S_DataFlashStatus AT91F_DataFlashWriteBuffer(
					AT91PS_DataFlash pDataFlash,
					unsigned char BufferCommand,
					unsigned char *dataBuffer,
					unsigned int bufferAddress,
					int SizeToWrite)
{
	int cmdsize;
	/* Test if the buffer command is legal */
	if ((BufferCommand != DB_BUF1_WRITE) &&
			(BufferCommand != DB_BUF2_WRITE)) {
		return DATAFLASH_BAD_COMMAND;
	}

	/* buffer address must be lower than page size */
	if (bufferAddress > pDataFlash->pDevice->pages_size)
		return DATAFLASH_BAD_ADDRESS;

	if ((pDataFlash->pDataFlashDesc->state) != IDLE)
		return DATAFLASH_BUSY;

	/* Send first Write Command */
	pDataFlash->pDataFlashDesc->command[0] = BufferCommand;
	pDataFlash->pDataFlashDesc->command[1] = 0;
	if (pDataFlash->pDevice->pages_number >= 16384) {
		pDataFlash->pDataFlashDesc->command[2] = 0;
		pDataFlash->pDataFlashDesc->command[3] =
			(unsigned char)(((unsigned int)(bufferAddress &
							pDataFlash->pDevice->
							byte_mask)) >> 8);
		pDataFlash->pDataFlashDesc->command[4] =
			(unsigned char)((unsigned int)bufferAddress & 0x00FF);
		cmdsize = 5;
	} else {
		pDataFlash->pDataFlashDesc->command[2] =
			(unsigned char)(((unsigned int)(bufferAddress &
							pDataFlash->pDevice->
							byte_mask)) >> 8);
		pDataFlash->pDataFlashDesc->command[3] =
			(unsigned char)((unsigned int)bufferAddress & 0x00FF);
		pDataFlash->pDataFlashDesc->command[4] = 0;
		cmdsize = 4;
	}

	pDataFlash->pDataFlashDesc->tx_cmd_pt =
		pDataFlash->pDataFlashDesc->command;
	pDataFlash->pDataFlashDesc->tx_cmd_size = cmdsize;
	pDataFlash->pDataFlashDesc->rx_cmd_pt =
		pDataFlash->pDataFlashDesc->command;
	pDataFlash->pDataFlashDesc->rx_cmd_size = cmdsize;

	pDataFlash->pDataFlashDesc->rx_data_pt = dataBuffer;
	pDataFlash->pDataFlashDesc->tx_data_pt = dataBuffer;
	pDataFlash->pDataFlashDesc->rx_data_size = SizeToWrite;
	pDataFlash->pDataFlashDesc->tx_data_size = SizeToWrite;

	return AT91F_SpiWrite(pDataFlash->pDataFlashDesc);
}

/*---------------------------------------------------------------------------*/
/* Function Name       : AT91F_PageErase                                     */
/* Object              : Erase a page 					     */
/* Input Parameters    : DataFlash Service				     */
/*                     : Page concerned					     */
/*                     : 						     */
/* Return value		: State of the dataflash			     */
/*---------------------------------------------------------------------------*/
AT91S_DataFlashStatus AT91F_PageErase(
					AT91PS_DataFlash pDataFlash,
					unsigned int page)
{
	int cmdsize;
	/* Test if the buffer command is legal */
	/* no data to transmit or receive */
	pDataFlash->pDataFlashDesc->tx_data_size = 0;

	cmdsize = 4;
	if (pDataFlash->pDevice->pages_number >= 16384)
		cmdsize = 5;
	return (AT91F_DataFlashSendCommand(pDataFlash,
				DB_PAGE_ERASE, cmdsize,
				page * pDataFlash->pDevice->pages_size));
}

/*---------------------------------------------------------------------------*/
/* Function Name       : AT91F_BlockErase                                    */
/* Object              : Erase a Block 					     */
/* Input Parameters    : DataFlash Service				     */
/*                     : Page concerned					     */
/*                     : 						     */
/* Return value		: State of the dataflash			     */
/*---------------------------------------------------------------------------*/
AT91S_DataFlashStatus AT91F_BlockErase(
				AT91PS_DataFlash pDataFlash,
				unsigned int block)
{
	int cmdsize;
	/* Test if the buffer command is legal */
	/* no data to transmit or receive */
	pDataFlash->pDataFlashDesc->tx_data_size = 0;
	cmdsize = 4;
	if (pDataFlash->pDevice->pages_number >= 16384)
		cmdsize = 5;
	return (AT91F_DataFlashSendCommand(pDataFlash, DB_BLOCK_ERASE, cmdsize,
					block * 8 *
					pDataFlash->pDevice->pages_size));
}

/*---------------------------------------------------------------------------*/
/* Function Name       : AT91F_WriteBufferToMain			     */
/* Object              : Write buffer to the main memory		     */
/* Input Parameters    : DataFlash Service				     */
/*		: <BufferCommand> = command to send to buffer1 or buffer2    */
/*                     : <dest> = main memory address			     */
/* Return value		: State of the dataflash			     */
/*---------------------------------------------------------------------------*/
AT91S_DataFlashStatus AT91F_WriteBufferToMain(AT91PS_DataFlash pDataFlash,
					unsigned char BufferCommand,
					unsigned int dest)
{
	int cmdsize;
	/* Test if the buffer command is correct */
	if ((BufferCommand != DB_BUF1_PAGE_PGM) &&
			(BufferCommand != DB_BUF1_PAGE_ERASE_PGM) &&
			(BufferCommand != DB_BUF2_PAGE_PGM) &&
			(BufferCommand != DB_BUF2_PAGE_ERASE_PGM))
		return DATAFLASH_BAD_COMMAND;

	/* no data to transmit or receive */
	pDataFlash->pDataFlashDesc->tx_data_size = 0;

	cmdsize = 4;
	if (pDataFlash->pDevice->pages_number >= 16384)
		cmdsize = 5;
	/* Send the command to the dataflash */
	return (AT91F_DataFlashSendCommand(pDataFlash, BufferCommand,
						cmdsize, dest));
}

/*---------------------------------------------------------------------------*/
/* Function Name       : AT91F_PartialPageWrite				     */
/* Object              : Erase partielly a page				     */
/* Input Parameters    : <page> = page number				     */
/*			: <AdrInpage> = adr to begin the fading		     */
/*                     : <length> = Number of bytes to erase		     */
/*---------------------------------------------------------------------------*/
AT91S_DataFlashStatus AT91F_PartialPageWrite(AT91PS_DataFlash pDataFlash,
					unsigned char *src,
					unsigned int dest,
					unsigned int size)
{
	unsigned int page;
	unsigned int AdrInPage;

	page = dest / (pDataFlash->pDevice->pages_size);
	AdrInPage = dest % (pDataFlash->pDevice->pages_size);

	/* Read the contents of the page in the Sram Buffer */
	AT91F_MainMemoryToBufferTransfert(pDataFlash, DB_PAGE_2_BUF1_TRF, page);
	AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
				 AT91C_TIMEOUT_WRDY);
	/*Update the SRAM buffer */
	AT91F_DataFlashWriteBuffer(pDataFlash, DB_BUF1_WRITE, src,
					AdrInPage, size);

	AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
					AT91C_TIMEOUT_WRDY);

	/* Erase page if a 128 Mbits device */
	if (pDataFlash->pDevice->pages_number >= 16384) {
		AT91F_PageErase(pDataFlash, page);
		/* Rewrite the modified Sram Buffer in the main memory */
		AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
					 AT91C_TIMEOUT_WRDY);
	}

	/* Rewrite the modified Sram Buffer in the main memory */
	return (AT91F_WriteBufferToMain(pDataFlash, DB_BUF1_PAGE_ERASE_PGM,
					(page *
					 pDataFlash->pDevice->pages_size)));
}

/*---------------------------------------------------------------------------*/
/* Function Name       : AT91F_DataFlashWrite				     */
/* Object              :						     */
/* Input Parameters    : <*src> = Source buffer				     */
/*                     : <dest> = dataflash adress			     */
/*                     : <size> = data buffer size			     */
/*---------------------------------------------------------------------------*/
AT91S_DataFlashStatus AT91F_DataFlashWrite(AT91PS_DataFlash pDataFlash,
						unsigned char *src,
						int dest, int size)
{
	unsigned int length;
	unsigned int page;
	unsigned int status;

	AT91F_SpiEnable(pDataFlash->pDevice->cs);

	if ((dest + size) > (pDataFlash->pDevice->pages_size *
			(pDataFlash->pDevice->pages_number)))
		return DATAFLASH_MEMORY_OVERFLOW;

	/* If destination does not fit a page start address */
	if ((dest % ((unsigned int)(pDataFlash->pDevice->pages_size))) != 0) {
		length =
			pDataFlash->pDevice->pages_size -
			(dest % ((unsigned int)(pDataFlash->pDevice->pages_size)));

		if (size < length)
			length = size;

		if (!AT91F_PartialPageWrite(pDataFlash, src, dest, length))
			return DATAFLASH_ERROR;

		AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
					 AT91C_TIMEOUT_WRDY);

		/* Update size, source and destination pointers */
		size -= length;
		dest += length;
		src += length;
	}

	while ((size - pDataFlash->pDevice->pages_size) >= 0) {
		/* program dataflash page */
		page = (unsigned int)dest / (pDataFlash->pDevice->pages_size);

		status = AT91F_DataFlashWriteBuffer(pDataFlash,
					DB_BUF1_WRITE, src, 0,
					pDataFlash->pDevice->
					pages_size);
		AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
					 AT91C_TIMEOUT_WRDY);

		status = AT91F_PageErase(pDataFlash, page);
		AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
					 AT91C_TIMEOUT_WRDY);
		if (!status)
			return DATAFLASH_ERROR;

		status = AT91F_WriteBufferToMain(pDataFlash,
					 DB_BUF1_PAGE_PGM, dest);
		if (!status)
			return DATAFLASH_ERROR;

		AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
					 AT91C_TIMEOUT_WRDY);

		/* Update size, source and destination pointers */
		size -= pDataFlash->pDevice->pages_size;
		dest += pDataFlash->pDevice->pages_size;
		src += pDataFlash->pDevice->pages_size;
	}

	/* If still some bytes to read */
	if (size > 0) {
		/* program dataflash page */
		if (!AT91F_PartialPageWrite(pDataFlash, src, dest, size))
			return DATAFLASH_ERROR;

		AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
					 AT91C_TIMEOUT_WRDY);
	}
	return DATAFLASH_OK;
}

/*---------------------------------------------------------------------------*/
/* Function Name       : AT91F_DataFlashRead 				     */
/* Object              : Read a block in dataflash			     */
/* Input Parameters    : 						     */
/* Return value		: 						     */
/*---------------------------------------------------------------------------*/
int AT91F_DataFlashRead(AT91PS_DataFlash pDataFlash,
			unsigned long addr, unsigned long size, char *buffer)
{
	unsigned long SizeToRead;

	AT91F_SpiEnable(pDataFlash->pDevice->cs);

	if (AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
					AT91C_TIMEOUT_WRDY) != DATAFLASH_OK)
		return -1;

	while (size) {
		SizeToRead = (size < 0x8000) ? size : 0x8000;

		if (AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
					AT91C_TIMEOUT_WRDY) !=
						DATAFLASH_OK)
			return -1;

		if (AT91F_DataFlashContinuousRead(pDataFlash, addr,
						(uchar *) buffer,
						SizeToRead) != DATAFLASH_OK)
			return -1;

		size -= SizeToRead;
		addr += SizeToRead;
		buffer += SizeToRead;
	}

	return DATAFLASH_OK;
}

/*---------------------------------------------------------------------------*/
/* Function Name       : AT91F_DataflashProbe 				     */
/* Object              : 						     */
/* Input Parameters    : 						     */
/* Return value	       : Dataflash status register			     */
/*---------------------------------------------------------------------------*/
int AT91F_DataflashProbe(int cs, AT91PS_DataflashDesc pDesc)
{
	AT91F_SpiEnable(cs);
	AT91F_DataFlashGetStatus(pDesc);
	return ((pDesc->command[1] == 0xFF) ? 0 : pDesc->command[1] & 0x3C);
}
#endif