1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Atmel DataFlash probing
4 *
5 * Copyright (C) 2004-2009, 2015 Freescale Semiconductor, Inc.
6 * Haikun Wang (haikun.wang@freescale.com)
7 */
8
9 #include <common.h>
10 #include <dm.h>
11 #include <errno.h>
12 #include <fdtdec.h>
13 #include <flash.h>
14 #include <log.h>
15 #include <spi.h>
16 #include <spi_flash.h>
17 #include <div64.h>
18 #include <linux/delay.h>
19 #include <linux/err.h>
20 #include <linux/math64.h>
21
22 #include "sf_internal.h"
23
24 #define CMD_READ_ID 0x9f
25 /* reads can bypass the buffers */
26 #define OP_READ_CONTINUOUS 0xE8
27 #define OP_READ_PAGE 0xD2
28
29 /* group B requests can run even while status reports "busy" */
30 #define OP_READ_STATUS 0xD7 /* group B */
31
32 /* move data between host and buffer */
33 #define OP_READ_BUFFER1 0xD4 /* group B */
34 #define OP_READ_BUFFER2 0xD6 /* group B */
35 #define OP_WRITE_BUFFER1 0x84 /* group B */
36 #define OP_WRITE_BUFFER2 0x87 /* group B */
37
38 /* erasing flash */
39 #define OP_ERASE_PAGE 0x81
40 #define OP_ERASE_BLOCK 0x50
41
42 /* move data between buffer and flash */
43 #define OP_TRANSFER_BUF1 0x53
44 #define OP_TRANSFER_BUF2 0x55
45 #define OP_MREAD_BUFFER1 0xD4
46 #define OP_MREAD_BUFFER2 0xD6
47 #define OP_MWERASE_BUFFER1 0x83
48 #define OP_MWERASE_BUFFER2 0x86
49 #define OP_MWRITE_BUFFER1 0x88 /* sector must be pre-erased */
50 #define OP_MWRITE_BUFFER2 0x89 /* sector must be pre-erased */
51
52 /* write to buffer, then write-erase to flash */
53 #define OP_PROGRAM_VIA_BUF1 0x82
54 #define OP_PROGRAM_VIA_BUF2 0x85
55
56 /* compare buffer to flash */
57 #define OP_COMPARE_BUF1 0x60
58 #define OP_COMPARE_BUF2 0x61
59
60 /* read flash to buffer, then write-erase to flash */
61 #define OP_REWRITE_VIA_BUF1 0x58
62 #define OP_REWRITE_VIA_BUF2 0x59
63
64 /*
65 * newer chips report JEDEC manufacturer and device IDs; chip
66 * serial number and OTP bits; and per-sector writeprotect.
67 */
68 #define OP_READ_ID 0x9F
69 #define OP_READ_SECURITY 0x77
70 #define OP_WRITE_SECURITY_REVC 0x9A
71 #define OP_WRITE_SECURITY 0x9B /* revision D */
72
73 struct dataflash {
74 uint8_t command[16];
75 unsigned short page_offset; /* offset in flash address */
76 };
77
78 /* Return the status of the DataFlash device */
dataflash_status(struct spi_slave * spi)79 static inline int dataflash_status(struct spi_slave *spi)
80 {
81 int ret;
82 u8 opcode = OP_READ_STATUS;
83 u8 status;
84
85 /*
86 * NOTE: at45db321c over 25 MHz wants to write
87 * a dummy byte after the opcode...
88 */
89 ret = spi_write_then_read(spi, &opcode, 1, NULL, &status, 1);
90 return ret ? -EIO : status;
91 }
92
93 /*
94 * Poll the DataFlash device until it is READY.
95 * This usually takes 5-20 msec or so; more for sector erase.
96 * ready: return > 0
97 */
dataflash_waitready(struct spi_slave * spi)98 static int dataflash_waitready(struct spi_slave *spi)
99 {
100 int status;
101 int timeout = 2 * CONFIG_SYS_HZ;
102 int timebase;
103
104 timebase = get_timer(0);
105 do {
106 status = dataflash_status(spi);
107 if (status < 0)
108 status = 0;
109
110 if (status & (1 << 7)) /* RDY/nBSY */
111 return status;
112
113 mdelay(3);
114 } while (get_timer(timebase) < timeout);
115
116 return -ETIME;
117 }
118
119 /* Erase pages of flash */
spi_dataflash_erase(struct udevice * dev,u32 offset,size_t len)120 static int spi_dataflash_erase(struct udevice *dev, u32 offset, size_t len)
121 {
122 struct dataflash *dataflash;
123 struct spi_flash *spi_flash;
124 struct spi_slave *spi;
125 unsigned blocksize;
126 uint8_t *command;
127 uint32_t rem;
128 int status;
129
130 dataflash = dev_get_priv(dev);
131 spi_flash = dev_get_uclass_priv(dev);
132 spi = spi_flash->spi;
133
134 blocksize = spi_flash->page_size << 3;
135
136 memset(dataflash->command, 0 , sizeof(dataflash->command));
137 command = dataflash->command;
138
139 debug("%s: erase addr=0x%x len 0x%x\n", dev->name, offset, len);
140
141 div_u64_rem(len, spi_flash->page_size, &rem);
142 if (rem) {
143 printf("%s: len(0x%x) isn't the multiple of page size(0x%x)\n",
144 dev->name, len, spi_flash->page_size);
145 return -EINVAL;
146 }
147 div_u64_rem(offset, spi_flash->page_size, &rem);
148 if (rem) {
149 printf("%s: offset(0x%x) isn't the multiple of page size(0x%x)\n",
150 dev->name, offset, spi_flash->page_size);
151 return -EINVAL;
152 }
153
154 status = spi_claim_bus(spi);
155 if (status) {
156 debug("dataflash: unable to claim SPI bus\n");
157 return status;
158 }
159
160 while (len > 0) {
161 unsigned int pageaddr;
162 int do_block;
163 /*
164 * Calculate flash page address; use block erase (for speed) if
165 * we're at a block boundary and need to erase the whole block.
166 */
167 pageaddr = div_u64(offset, spi_flash->page_size);
168 do_block = (pageaddr & 0x7) == 0 && len >= blocksize;
169 pageaddr = pageaddr << dataflash->page_offset;
170
171 command[0] = do_block ? OP_ERASE_BLOCK : OP_ERASE_PAGE;
172 command[1] = (uint8_t)(pageaddr >> 16);
173 command[2] = (uint8_t)(pageaddr >> 8);
174 command[3] = 0;
175
176 debug("%s ERASE %s: (%x) %x %x %x [%d]\n",
177 dev->name, do_block ? "block" : "page",
178 command[0], command[1], command[2], command[3],
179 pageaddr);
180
181 status = spi_write_then_read(spi, command, 4, NULL, NULL, 0);
182 if (status < 0) {
183 debug("%s: erase send command error!\n", dev->name);
184 return -EIO;
185 }
186
187 status = dataflash_waitready(spi);
188 if (status < 0) {
189 debug("%s: erase waitready error!\n", dev->name);
190 return status;
191 }
192
193 if (do_block) {
194 offset += blocksize;
195 len -= blocksize;
196 } else {
197 offset += spi_flash->page_size;
198 len -= spi_flash->page_size;
199 }
200 }
201
202 spi_release_bus(spi);
203
204 return 0;
205 }
206
207 /*
208 * Read from the DataFlash device.
209 * offset : Start offset in flash device
210 * len : Amount to read
211 * buf : Buffer containing the data
212 */
spi_dataflash_read(struct udevice * dev,u32 offset,size_t len,void * buf)213 static int spi_dataflash_read(struct udevice *dev, u32 offset, size_t len,
214 void *buf)
215 {
216 struct dataflash *dataflash;
217 struct spi_flash *spi_flash;
218 struct spi_slave *spi;
219 unsigned int addr;
220 uint8_t *command;
221 int status;
222
223 dataflash = dev_get_priv(dev);
224 spi_flash = dev_get_uclass_priv(dev);
225 spi = spi_flash->spi;
226
227 memset(dataflash->command, 0 , sizeof(dataflash->command));
228 command = dataflash->command;
229
230 debug("%s: erase addr=0x%x len 0x%x\n", dev->name, offset, len);
231 debug("READ: (%x) %x %x %x\n",
232 command[0], command[1], command[2], command[3]);
233
234 /* Calculate flash page/byte address */
235 addr = (((unsigned)offset / spi_flash->page_size)
236 << dataflash->page_offset)
237 + ((unsigned)offset % spi_flash->page_size);
238
239 status = spi_claim_bus(spi);
240 if (status) {
241 debug("dataflash: unable to claim SPI bus\n");
242 return status;
243 }
244
245 /*
246 * Continuous read, max clock = f(car) which may be less than
247 * the peak rate available. Some chips support commands with
248 * fewer "don't care" bytes. Both buffers stay unchanged.
249 */
250 command[0] = OP_READ_CONTINUOUS;
251 command[1] = (uint8_t)(addr >> 16);
252 command[2] = (uint8_t)(addr >> 8);
253 command[3] = (uint8_t)(addr >> 0);
254
255 /* plus 4 "don't care" bytes, command len: 4 + 4 "don't care" bytes */
256 status = spi_write_then_read(spi, command, 8, NULL, buf, len);
257
258 spi_release_bus(spi);
259
260 return status;
261 }
262
263 /*
264 * Write to the DataFlash device.
265 * offset : Start offset in flash device
266 * len : Amount to write
267 * buf : Buffer containing the data
268 */
spi_dataflash_write(struct udevice * dev,u32 offset,size_t len,const void * buf)269 int spi_dataflash_write(struct udevice *dev, u32 offset, size_t len,
270 const void *buf)
271 {
272 struct dataflash *dataflash;
273 struct spi_flash *spi_flash;
274 struct spi_slave *spi;
275 uint8_t *command;
276 unsigned int pageaddr, addr, to, writelen;
277 size_t remaining = len;
278 u_char *writebuf = (u_char *)buf;
279 int status = -EINVAL;
280
281 dataflash = dev_get_priv(dev);
282 spi_flash = dev_get_uclass_priv(dev);
283 spi = spi_flash->spi;
284
285 memset(dataflash->command, 0 , sizeof(dataflash->command));
286 command = dataflash->command;
287
288 debug("%s: write 0x%x..0x%x\n", dev->name, offset, (offset + len));
289
290 pageaddr = ((unsigned)offset / spi_flash->page_size);
291 to = ((unsigned)offset % spi_flash->page_size);
292 if (to + len > spi_flash->page_size)
293 writelen = spi_flash->page_size - to;
294 else
295 writelen = len;
296
297 status = spi_claim_bus(spi);
298 if (status) {
299 debug("dataflash: unable to claim SPI bus\n");
300 return status;
301 }
302
303 while (remaining > 0) {
304 debug("write @ %d:%d len=%d\n", pageaddr, to, writelen);
305
306 /*
307 * REVISIT:
308 * (a) each page in a sector must be rewritten at least
309 * once every 10K sibling erase/program operations.
310 * (b) for pages that are already erased, we could
311 * use WRITE+MWRITE not PROGRAM for ~30% speedup.
312 * (c) WRITE to buffer could be done while waiting for
313 * a previous MWRITE/MWERASE to complete ...
314 * (d) error handling here seems to be mostly missing.
315 *
316 * Two persistent bits per page, plus a per-sector counter,
317 * could support (a) and (b) ... we might consider using
318 * the second half of sector zero, which is just one block,
319 * to track that state. (On AT91, that sector should also
320 * support boot-from-DataFlash.)
321 */
322
323 addr = pageaddr << dataflash->page_offset;
324
325 /* (1) Maybe transfer partial page to Buffer1 */
326 if (writelen != spi_flash->page_size) {
327 command[0] = OP_TRANSFER_BUF1;
328 command[1] = (addr & 0x00FF0000) >> 16;
329 command[2] = (addr & 0x0000FF00) >> 8;
330 command[3] = 0;
331
332 debug("TRANSFER: (%x) %x %x %x\n",
333 command[0], command[1], command[2], command[3]);
334
335 status = spi_write_then_read(spi, command, 4,
336 NULL, NULL, 0);
337 if (status < 0) {
338 debug("%s: write(<pagesize) command error!\n",
339 dev->name);
340 return -EIO;
341 }
342
343 status = dataflash_waitready(spi);
344 if (status < 0) {
345 debug("%s: write(<pagesize) waitready error!\n",
346 dev->name);
347 return status;
348 }
349 }
350
351 /* (2) Program full page via Buffer1 */
352 addr += to;
353 command[0] = OP_PROGRAM_VIA_BUF1;
354 command[1] = (addr & 0x00FF0000) >> 16;
355 command[2] = (addr & 0x0000FF00) >> 8;
356 command[3] = (addr & 0x000000FF);
357
358 debug("PROGRAM: (%x) %x %x %x\n",
359 command[0], command[1], command[2], command[3]);
360
361 status = spi_write_then_read(spi, command, 4,
362 writebuf, NULL, writelen);
363 if (status < 0) {
364 debug("%s: write send command error!\n", dev->name);
365 return -EIO;
366 }
367
368 status = dataflash_waitready(spi);
369 if (status < 0) {
370 debug("%s: write waitready error!\n", dev->name);
371 return status;
372 }
373
374 #ifdef CONFIG_SPI_DATAFLASH_WRITE_VERIFY
375 /* (3) Compare to Buffer1 */
376 addr = pageaddr << dataflash->page_offset;
377 command[0] = OP_COMPARE_BUF1;
378 command[1] = (addr & 0x00FF0000) >> 16;
379 command[2] = (addr & 0x0000FF00) >> 8;
380 command[3] = 0;
381
382 debug("COMPARE: (%x) %x %x %x\n",
383 command[0], command[1], command[2], command[3]);
384
385 status = spi_write_then_read(spi, command, 4,
386 writebuf, NULL, writelen);
387 if (status < 0) {
388 debug("%s: write(compare) send command error!\n",
389 dev->name);
390 return -EIO;
391 }
392
393 status = dataflash_waitready(spi);
394
395 /* Check result of the compare operation */
396 if (status & (1 << 6)) {
397 printf("dataflash: write compare page %u, err %d\n",
398 pageaddr, status);
399 remaining = 0;
400 status = -EIO;
401 break;
402 } else {
403 status = 0;
404 }
405
406 #endif /* CONFIG_SPI_DATAFLASH_WRITE_VERIFY */
407 remaining = remaining - writelen;
408 pageaddr++;
409 to = 0;
410 writebuf += writelen;
411
412 if (remaining > spi_flash->page_size)
413 writelen = spi_flash->page_size;
414 else
415 writelen = remaining;
416 }
417
418 spi_release_bus(spi);
419
420 return 0;
421 }
422
add_dataflash(struct udevice * dev,char * name,int nr_pages,int pagesize,int pageoffset,char revision)423 static int add_dataflash(struct udevice *dev, char *name, int nr_pages,
424 int pagesize, int pageoffset, char revision)
425 {
426 struct spi_flash *spi_flash;
427 struct dataflash *dataflash;
428
429 dataflash = dev_get_priv(dev);
430 spi_flash = dev_get_uclass_priv(dev);
431
432 dataflash->page_offset = pageoffset;
433
434 spi_flash->name = name;
435 spi_flash->page_size = pagesize;
436 spi_flash->size = nr_pages * pagesize;
437 spi_flash->erase_size = pagesize;
438
439 #ifndef CONFIG_SPL_BUILD
440 printf("SPI DataFlash: Detected %s with page size ", spi_flash->name);
441 print_size(spi_flash->page_size, ", erase size ");
442 print_size(spi_flash->erase_size, ", total ");
443 print_size(spi_flash->size, "");
444 printf(", revision %c", revision);
445 puts("\n");
446 #endif
447
448 return 0;
449 }
450
451 struct data_flash_info {
452 char *name;
453
454 /*
455 * JEDEC id has a high byte of zero plus three data bytes:
456 * the manufacturer id, then a two byte device id.
457 */
458 uint32_t jedec_id;
459
460 /* The size listed here is what works with OP_ERASE_PAGE. */
461 unsigned nr_pages;
462 uint16_t pagesize;
463 uint16_t pageoffset;
464
465 uint16_t flags;
466 #define SUP_POW2PS 0x0002 /* supports 2^N byte pages */
467 #define IS_POW2PS 0x0001 /* uses 2^N byte pages */
468 };
469
470 static struct data_flash_info dataflash_data[] = {
471 /*
472 * NOTE: chips with SUP_POW2PS (rev D and up) need two entries,
473 * one with IS_POW2PS and the other without. The entry with the
474 * non-2^N byte page size can't name exact chip revisions without
475 * losing backwards compatibility for cmdlinepart.
476 *
477 * Those two entries have different name spelling format in order to
478 * show their difference obviously.
479 * The upper case refer to the chip isn't in normal 2^N bytes page-size
480 * mode.
481 * The lower case refer to the chip is in normal 2^N bytes page-size
482 * mode.
483 *
484 * These newer chips also support 128-byte security registers (with
485 * 64 bytes one-time-programmable) and software write-protection.
486 */
487 { "AT45DB011B", 0x1f2200, 512, 264, 9, SUP_POW2PS},
488 { "at45db011d", 0x1f2200, 512, 256, 8, SUP_POW2PS | IS_POW2PS},
489
490 { "AT45DB021B", 0x1f2300, 1024, 264, 9, SUP_POW2PS},
491 { "at45db021d", 0x1f2300, 1024, 256, 8, SUP_POW2PS | IS_POW2PS},
492
493 { "AT45DB041x", 0x1f2400, 2048, 264, 9, SUP_POW2PS},
494 { "at45db041d", 0x1f2400, 2048, 256, 8, SUP_POW2PS | IS_POW2PS},
495
496 { "AT45DB081B", 0x1f2500, 4096, 264, 9, SUP_POW2PS},
497 { "at45db081d", 0x1f2500, 4096, 256, 8, SUP_POW2PS | IS_POW2PS},
498
499 { "AT45DB161x", 0x1f2600, 4096, 528, 10, SUP_POW2PS},
500 { "at45db161d", 0x1f2600, 4096, 512, 9, SUP_POW2PS | IS_POW2PS},
501
502 { "AT45DB321x", 0x1f2700, 8192, 528, 10, 0}, /* rev C */
503
504 { "AT45DB321x", 0x1f2701, 8192, 528, 10, SUP_POW2PS},
505 { "at45db321d", 0x1f2701, 8192, 512, 9, SUP_POW2PS | IS_POW2PS},
506
507 { "AT45DB642x", 0x1f2800, 8192, 1056, 11, SUP_POW2PS},
508 { "at45db642d", 0x1f2800, 8192, 1024, 10, SUP_POW2PS | IS_POW2PS},
509 };
510
jedec_probe(struct spi_slave * spi)511 static struct data_flash_info *jedec_probe(struct spi_slave *spi)
512 {
513 int tmp;
514 uint8_t id[5];
515 uint32_t jedec;
516 struct data_flash_info *info;
517 u8 opcode = CMD_READ_ID;
518 int status;
519
520 /*
521 * JEDEC also defines an optional "extended device information"
522 * string for after vendor-specific data, after the three bytes
523 * we use here. Supporting some chips might require using it.
524 *
525 * If the vendor ID isn't Atmel's (0x1f), assume this call failed.
526 * That's not an error; only rev C and newer chips handle it, and
527 * only Atmel sells these chips.
528 */
529 tmp = spi_write_then_read(spi, &opcode, 1, NULL, id, sizeof(id));
530 if (tmp < 0) {
531 printf("dataflash: error %d reading JEDEC ID\n", tmp);
532 return ERR_PTR(tmp);
533 }
534 if (id[0] != 0x1f)
535 return NULL;
536
537 jedec = id[0];
538 jedec = jedec << 8;
539 jedec |= id[1];
540 jedec = jedec << 8;
541 jedec |= id[2];
542
543 for (tmp = 0, info = dataflash_data;
544 tmp < ARRAY_SIZE(dataflash_data);
545 tmp++, info++) {
546 if (info->jedec_id == jedec) {
547 if (info->flags & SUP_POW2PS) {
548 status = dataflash_status(spi);
549 if (status < 0) {
550 debug("dataflash: status error %d\n",
551 status);
552 return NULL;
553 }
554 if (status & 0x1) {
555 if (info->flags & IS_POW2PS)
556 return info;
557 } else {
558 if (!(info->flags & IS_POW2PS))
559 return info;
560 }
561 } else {
562 return info;
563 }
564 }
565 }
566
567 /*
568 * Treat other chips as errors ... we won't know the right page
569 * size (it might be binary) even when we can tell which density
570 * class is involved (legacy chip id scheme).
571 */
572 printf("dataflash: JEDEC id %06x not handled\n", jedec);
573 return ERR_PTR(-ENODEV);
574 }
575
576 /*
577 * Detect and initialize DataFlash device, using JEDEC IDs on newer chips
578 * or else the ID code embedded in the status bits:
579 *
580 * Device Density ID code #Pages PageSize Offset
581 * AT45DB011B 1Mbit (128K) xx0011xx (0x0c) 512 264 9
582 * AT45DB021B 2Mbit (256K) xx0101xx (0x14) 1024 264 9
583 * AT45DB041B 4Mbit (512K) xx0111xx (0x1c) 2048 264 9
584 * AT45DB081B 8Mbit (1M) xx1001xx (0x24) 4096 264 9
585 * AT45DB0161B 16Mbit (2M) xx1011xx (0x2c) 4096 528 10
586 * AT45DB0321B 32Mbit (4M) xx1101xx (0x34) 8192 528 10
587 * AT45DB0642 64Mbit (8M) xx111xxx (0x3c) 8192 1056 11
588 * AT45DB1282 128Mbit (16M) xx0100xx (0x10) 16384 1056 11
589 */
spi_dataflash_probe(struct udevice * dev)590 static int spi_dataflash_probe(struct udevice *dev)
591 {
592 struct spi_slave *spi = dev_get_parent_priv(dev);
593 struct spi_flash *spi_flash;
594 struct data_flash_info *info;
595 int status;
596
597 spi_flash = dev_get_uclass_priv(dev);
598 spi_flash->spi = spi;
599 spi_flash->dev = dev;
600
601 status = spi_claim_bus(spi);
602 if (status)
603 return status;
604
605 /*
606 * Try to detect dataflash by JEDEC ID.
607 * If it succeeds we know we have either a C or D part.
608 * D will support power of 2 pagesize option.
609 * Both support the security register, though with different
610 * write procedures.
611 */
612 info = jedec_probe(spi);
613 if (IS_ERR(info))
614 goto err_jedec_probe;
615 if (info != NULL) {
616 status = add_dataflash(dev, info->name, info->nr_pages,
617 info->pagesize, info->pageoffset,
618 (info->flags & SUP_POW2PS) ? 'd' : 'c');
619 if (status < 0)
620 goto err_status;
621 }
622
623 /*
624 * Older chips support only legacy commands, identifing
625 * capacity using bits in the status byte.
626 */
627 status = dataflash_status(spi);
628 if (status <= 0 || status == 0xff) {
629 printf("dataflash: read status error %d\n", status);
630 if (status == 0 || status == 0xff)
631 status = -ENODEV;
632 goto err_jedec_probe;
633 }
634
635 /*
636 * if there's a device there, assume it's dataflash.
637 * board setup should have set spi->max_speed_max to
638 * match f(car) for continuous reads, mode 0 or 3.
639 */
640 switch (status & 0x3c) {
641 case 0x0c: /* 0 0 1 1 x x */
642 status = add_dataflash(dev, "AT45DB011B", 512, 264, 9, 0);
643 break;
644 case 0x14: /* 0 1 0 1 x x */
645 status = add_dataflash(dev, "AT45DB021B", 1024, 264, 9, 0);
646 break;
647 case 0x1c: /* 0 1 1 1 x x */
648 status = add_dataflash(dev, "AT45DB041x", 2048, 264, 9, 0);
649 break;
650 case 0x24: /* 1 0 0 1 x x */
651 status = add_dataflash(dev, "AT45DB081B", 4096, 264, 9, 0);
652 break;
653 case 0x2c: /* 1 0 1 1 x x */
654 status = add_dataflash(dev, "AT45DB161x", 4096, 528, 10, 0);
655 break;
656 case 0x34: /* 1 1 0 1 x x */
657 status = add_dataflash(dev, "AT45DB321x", 8192, 528, 10, 0);
658 break;
659 case 0x38: /* 1 1 1 x x x */
660 case 0x3c:
661 status = add_dataflash(dev, "AT45DB642x", 8192, 1056, 11, 0);
662 break;
663 /* obsolete AT45DB1282 not (yet?) supported */
664 default:
665 printf("dataflash: unsupported device (%x)\n", status & 0x3c);
666 status = -ENODEV;
667 goto err_status;
668 }
669
670 return status;
671
672 err_status:
673 spi_free_slave(spi);
674 err_jedec_probe:
675 spi_release_bus(spi);
676 return status;
677 }
678
679 static const struct dm_spi_flash_ops spi_dataflash_ops = {
680 .read = spi_dataflash_read,
681 .write = spi_dataflash_write,
682 .erase = spi_dataflash_erase,
683 };
684
685 static const struct udevice_id spi_dataflash_ids[] = {
686 { .compatible = "atmel,at45", },
687 { .compatible = "atmel,dataflash", },
688 { }
689 };
690
691 U_BOOT_DRIVER(spi_dataflash) = {
692 .name = "spi_dataflash",
693 .id = UCLASS_SPI_FLASH,
694 .of_match = spi_dataflash_ids,
695 .probe = spi_dataflash_probe,
696 .priv_auto = sizeof(struct dataflash),
697 .ops = &spi_dataflash_ops,
698 };
699