blob: 4a4366437e1750caf8223a7d9641300b68b9157f [file] [log] [blame]
David Brownell1d6432f2006-01-08 13:34:22 -08001/*
2 * Atmel AT45xxx DataFlash MTD driver for lightweight SPI framework
3 *
4 * Largely derived from at91_dataflash.c:
5 * Copyright (C) 2003-2005 SAN People (Pty) Ltd
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11*/
David Brownell1d6432f2006-01-08 13:34:22 -080012#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/slab.h>
15#include <linux/delay.h>
16#include <linux/device.h>
Matthias Kaehlckeec9ce522007-06-28 22:58:42 +010017#include <linux/mutex.h>
akpm@linux-foundation.org771999b2008-07-29 22:22:40 -070018#include <linux/err.h>
Artem Bityutskiy5b7f3a52008-12-18 14:09:56 +020019#include <linux/math64.h>
Shawn Guob94e7572011-07-15 16:38:56 +080020#include <linux/of.h>
21#include <linux/of_device.h>
akpm@linux-foundation.org771999b2008-07-29 22:22:40 -070022
David Brownell1d6432f2006-01-08 13:34:22 -080023#include <linux/spi/spi.h>
24#include <linux/spi/flash.h>
25
26#include <linux/mtd/mtd.h>
27#include <linux/mtd/partitions.h>
28
David Brownell1d6432f2006-01-08 13:34:22 -080029/*
30 * DataFlash is a kind of SPI flash. Most AT45 chips have two buffers in
31 * each chip, which may be used for double buffered I/O; but this driver
32 * doesn't (yet) use these for any kind of i/o overlap or prefetching.
33 *
34 * Sometimes DataFlash is packaged in MMC-format cards, although the
David Brownell8c640382008-08-06 21:55:14 -070035 * MMC stack can't (yet?) distinguish between MMC and DataFlash
David Brownell1d6432f2006-01-08 13:34:22 -080036 * protocols during enumeration.
37 */
38
David Brownell1d6432f2006-01-08 13:34:22 -080039/* reads can bypass the buffers */
40#define OP_READ_CONTINUOUS 0xE8
41#define OP_READ_PAGE 0xD2
42
43/* group B requests can run even while status reports "busy" */
44#define OP_READ_STATUS 0xD7 /* group B */
45
46/* move data between host and buffer */
47#define OP_READ_BUFFER1 0xD4 /* group B */
48#define OP_READ_BUFFER2 0xD6 /* group B */
49#define OP_WRITE_BUFFER1 0x84 /* group B */
50#define OP_WRITE_BUFFER2 0x87 /* group B */
51
52/* erasing flash */
53#define OP_ERASE_PAGE 0x81
54#define OP_ERASE_BLOCK 0x50
55
56/* move data between buffer and flash */
57#define OP_TRANSFER_BUF1 0x53
58#define OP_TRANSFER_BUF2 0x55
59#define OP_MREAD_BUFFER1 0xD4
60#define OP_MREAD_BUFFER2 0xD6
61#define OP_MWERASE_BUFFER1 0x83
62#define OP_MWERASE_BUFFER2 0x86
63#define OP_MWRITE_BUFFER1 0x88 /* sector must be pre-erased */
64#define OP_MWRITE_BUFFER2 0x89 /* sector must be pre-erased */
65
66/* write to buffer, then write-erase to flash */
67#define OP_PROGRAM_VIA_BUF1 0x82
68#define OP_PROGRAM_VIA_BUF2 0x85
69
70/* compare buffer to flash */
71#define OP_COMPARE_BUF1 0x60
72#define OP_COMPARE_BUF2 0x61
73
74/* read flash to buffer, then write-erase to flash */
75#define OP_REWRITE_VIA_BUF1 0x58
76#define OP_REWRITE_VIA_BUF2 0x59
77
78/* newer chips report JEDEC manufacturer and device IDs; chip
79 * serial number and OTP bits; and per-sector writeprotect.
80 */
81#define OP_READ_ID 0x9F
82#define OP_READ_SECURITY 0x77
David Brownell34a82442008-07-30 12:35:05 -070083#define OP_WRITE_SECURITY_REVC 0x9A
84#define OP_WRITE_SECURITY 0x9B /* revision D */
David Brownell1d6432f2006-01-08 13:34:22 -080085
86
87struct dataflash {
David Woodhouse271c5c52008-06-04 17:43:22 +010088 uint8_t command[4];
David Brownell1d6432f2006-01-08 13:34:22 -080089 char name[24];
90
91 unsigned partitioned:1;
92
93 unsigned short page_offset; /* offset in flash address */
94 unsigned int page_size; /* of bytes per page */
95
Matthias Kaehlckeec9ce522007-06-28 22:58:42 +010096 struct mutex lock;
David Brownell1d6432f2006-01-08 13:34:22 -080097 struct spi_device *spi;
98
99 struct mtd_info mtd;
100};
101
Shawn Guob94e7572011-07-15 16:38:56 +0800102#ifdef CONFIG_OF
103static const struct of_device_id dataflash_dt_ids[] = {
104 { .compatible = "atmel,at45", },
105 { .compatible = "atmel,dataflash", },
106 { /* sentinel */ }
107};
Shawn Guob94e7572011-07-15 16:38:56 +0800108#endif
109
David Brownell1d6432f2006-01-08 13:34:22 -0800110/* ......................................................................... */
111
112/*
113 * Return the status of the DataFlash device.
114 */
115static inline int dataflash_status(struct spi_device *spi)
116{
117 /* NOTE: at45db321c over 25 MHz wants to write
118 * a dummy byte after the opcode...
119 */
120 return spi_w8r8(spi, OP_READ_STATUS);
121}
122
123/*
124 * Poll the DataFlash device until it is READY.
125 * This usually takes 5-20 msec or so; more for sector erase.
126 */
127static int dataflash_waitready(struct spi_device *spi)
128{
129 int status;
130
131 for (;;) {
132 status = dataflash_status(spi);
133 if (status < 0) {
Brian Norris289c0522011-07-19 10:06:09 -0700134 pr_debug("%s: status %d?\n",
Kay Sievers160bbab2008-12-23 10:00:14 +0000135 dev_name(&spi->dev), status);
David Brownell1d6432f2006-01-08 13:34:22 -0800136 status = 0;
137 }
138
139 if (status & (1 << 7)) /* RDY/nBSY */
140 return status;
141
142 msleep(3);
143 }
144}
145
146/* ......................................................................... */
147
148/*
149 * Erase pages of flash.
150 */
151static int dataflash_erase(struct mtd_info *mtd, struct erase_info *instr)
152{
Kulikov Vasiliy42845d22010-06-29 14:15:13 +0400153 struct dataflash *priv = mtd->priv;
David Brownell1d6432f2006-01-08 13:34:22 -0800154 struct spi_device *spi = priv->spi;
Vitaly Wool8275c642006-01-08 13:34:28 -0800155 struct spi_transfer x = { .tx_dma = 0, };
David Brownell1d6432f2006-01-08 13:34:22 -0800156 struct spi_message msg;
157 unsigned blocksize = priv->page_size << 3;
David Woodhouse271c5c52008-06-04 17:43:22 +0100158 uint8_t *command;
Artem Bityutskiy5b7f3a52008-12-18 14:09:56 +0200159 uint32_t rem;
David Brownell1d6432f2006-01-08 13:34:22 -0800160
Brian Norris289c0522011-07-19 10:06:09 -0700161 pr_debug("%s: erase addr=0x%llx len 0x%llx\n",
Kay Sievers160bbab2008-12-23 10:00:14 +0000162 dev_name(&spi->dev), (long long)instr->addr,
163 (long long)instr->len);
David Brownell1d6432f2006-01-08 13:34:22 -0800164
Artem Bityutskiy5b7f3a52008-12-18 14:09:56 +0200165 div_u64_rem(instr->len, priv->page_size, &rem);
166 if (rem)
167 return -EINVAL;
168 div_u64_rem(instr->addr, priv->page_size, &rem);
169 if (rem)
David Brownell1d6432f2006-01-08 13:34:22 -0800170 return -EINVAL;
171
Vitaly Wool8275c642006-01-08 13:34:28 -0800172 spi_message_init(&msg);
173
174 x.tx_buf = command = priv->command;
175 x.len = 4;
176 spi_message_add_tail(&x, &msg);
David Brownell1d6432f2006-01-08 13:34:22 -0800177
Matthias Kaehlckeec9ce522007-06-28 22:58:42 +0100178 mutex_lock(&priv->lock);
David Brownell1d6432f2006-01-08 13:34:22 -0800179 while (instr->len > 0) {
180 unsigned int pageaddr;
181 int status;
182 int do_block;
183
184 /* Calculate flash page address; use block erase (for speed) if
185 * we're at a block boundary and need to erase the whole block.
186 */
Peter Korsgaarddbf8c112009-05-18 11:13:54 +0100187 pageaddr = div_u64(instr->addr, priv->page_size);
David Brownell3cb4f092006-03-13 21:20:40 -0800188 do_block = (pageaddr & 0x7) == 0 && instr->len >= blocksize;
David Brownell1d6432f2006-01-08 13:34:22 -0800189 pageaddr = pageaddr << priv->page_offset;
190
191 command[0] = do_block ? OP_ERASE_BLOCK : OP_ERASE_PAGE;
David Woodhouse271c5c52008-06-04 17:43:22 +0100192 command[1] = (uint8_t)(pageaddr >> 16);
193 command[2] = (uint8_t)(pageaddr >> 8);
David Brownell1d6432f2006-01-08 13:34:22 -0800194 command[3] = 0;
195
Brian Norris289c0522011-07-19 10:06:09 -0700196 pr_debug("ERASE %s: (%x) %x %x %x [%i]\n",
David Brownell1d6432f2006-01-08 13:34:22 -0800197 do_block ? "block" : "page",
198 command[0], command[1], command[2], command[3],
199 pageaddr);
200
201 status = spi_sync(spi, &msg);
202 (void) dataflash_waitready(spi);
203
204 if (status < 0) {
205 printk(KERN_ERR "%s: erase %x, err %d\n",
Kay Sievers160bbab2008-12-23 10:00:14 +0000206 dev_name(&spi->dev), pageaddr, status);
David Brownell1d6432f2006-01-08 13:34:22 -0800207 /* REVISIT: can retry instr->retries times; or
208 * giveup and instr->fail_addr = instr->addr;
209 */
210 continue;
211 }
212
213 if (do_block) {
214 instr->addr += blocksize;
215 instr->len -= blocksize;
216 } else {
217 instr->addr += priv->page_size;
218 instr->len -= priv->page_size;
219 }
220 }
Matthias Kaehlckeec9ce522007-06-28 22:58:42 +0100221 mutex_unlock(&priv->lock);
David Brownell1d6432f2006-01-08 13:34:22 -0800222
223 /* Inform MTD subsystem that erase is complete */
224 instr->state = MTD_ERASE_DONE;
225 mtd_erase_callback(instr);
226
227 return 0;
228}
229
230/*
231 * Read from the DataFlash device.
232 * from : Start offset in flash device
233 * len : Amount to read
234 * retlen : About of data actually read
235 * buf : Buffer containing the data
236 */
237static int dataflash_read(struct mtd_info *mtd, loff_t from, size_t len,
238 size_t *retlen, u_char *buf)
239{
Kulikov Vasiliy42845d22010-06-29 14:15:13 +0400240 struct dataflash *priv = mtd->priv;
David Brownell1d6432f2006-01-08 13:34:22 -0800241 struct spi_transfer x[2] = { { .tx_dma = 0, }, };
242 struct spi_message msg;
243 unsigned int addr;
David Woodhouse271c5c52008-06-04 17:43:22 +0100244 uint8_t *command;
David Brownell1d6432f2006-01-08 13:34:22 -0800245 int status;
246
Brian Norris0a32a102011-07-19 10:06:10 -0700247 pr_debug("%s: read 0x%x..0x%x\n", dev_name(&priv->spi->dev),
248 (unsigned)from, (unsigned)(from + len));
David Brownell1d6432f2006-01-08 13:34:22 -0800249
David Brownell1d6432f2006-01-08 13:34:22 -0800250 /* Calculate flash page/byte address */
251 addr = (((unsigned)from / priv->page_size) << priv->page_offset)
252 + ((unsigned)from % priv->page_size);
253
254 command = priv->command;
255
Brian Norris289c0522011-07-19 10:06:09 -0700256 pr_debug("READ: (%x) %x %x %x\n",
David Brownell1d6432f2006-01-08 13:34:22 -0800257 command[0], command[1], command[2], command[3]);
258
Vitaly Wool8275c642006-01-08 13:34:28 -0800259 spi_message_init(&msg);
260
David Brownell1d6432f2006-01-08 13:34:22 -0800261 x[0].tx_buf = command;
262 x[0].len = 8;
Vitaly Wool8275c642006-01-08 13:34:28 -0800263 spi_message_add_tail(&x[0], &msg);
264
David Brownell1d6432f2006-01-08 13:34:22 -0800265 x[1].rx_buf = buf;
266 x[1].len = len;
Vitaly Wool8275c642006-01-08 13:34:28 -0800267 spi_message_add_tail(&x[1], &msg);
David Brownell1d6432f2006-01-08 13:34:22 -0800268
Matthias Kaehlckeec9ce522007-06-28 22:58:42 +0100269 mutex_lock(&priv->lock);
David Brownell1d6432f2006-01-08 13:34:22 -0800270
271 /* Continuous read, max clock = f(car) which may be less than
272 * the peak rate available. Some chips support commands with
273 * fewer "don't care" bytes. Both buffers stay unchanged.
274 */
275 command[0] = OP_READ_CONTINUOUS;
David Woodhouse271c5c52008-06-04 17:43:22 +0100276 command[1] = (uint8_t)(addr >> 16);
277 command[2] = (uint8_t)(addr >> 8);
278 command[3] = (uint8_t)(addr >> 0);
David Brownell1d6432f2006-01-08 13:34:22 -0800279 /* plus 4 "don't care" bytes */
280
281 status = spi_sync(priv->spi, &msg);
Matthias Kaehlckeec9ce522007-06-28 22:58:42 +0100282 mutex_unlock(&priv->lock);
David Brownell1d6432f2006-01-08 13:34:22 -0800283
284 if (status >= 0) {
285 *retlen = msg.actual_length - 8;
286 status = 0;
287 } else
Brian Norris289c0522011-07-19 10:06:09 -0700288 pr_debug("%s: read %x..%x --> %d\n",
Kay Sievers160bbab2008-12-23 10:00:14 +0000289 dev_name(&priv->spi->dev),
David Brownell1d6432f2006-01-08 13:34:22 -0800290 (unsigned)from, (unsigned)(from + len),
291 status);
292 return status;
293}
294
295/*
296 * Write to the DataFlash device.
297 * to : Start offset in flash device
298 * len : Amount to write
299 * retlen : Amount of data actually written
300 * buf : Buffer containing the data
301 */
302static int dataflash_write(struct mtd_info *mtd, loff_t to, size_t len,
303 size_t * retlen, const u_char * buf)
304{
Kulikov Vasiliy42845d22010-06-29 14:15:13 +0400305 struct dataflash *priv = mtd->priv;
David Brownell1d6432f2006-01-08 13:34:22 -0800306 struct spi_device *spi = priv->spi;
307 struct spi_transfer x[2] = { { .tx_dma = 0, }, };
308 struct spi_message msg;
309 unsigned int pageaddr, addr, offset, writelen;
310 size_t remaining = len;
311 u_char *writebuf = (u_char *) buf;
312 int status = -EINVAL;
David Woodhouse271c5c52008-06-04 17:43:22 +0100313 uint8_t *command;
David Brownell1d6432f2006-01-08 13:34:22 -0800314
Brian Norris289c0522011-07-19 10:06:09 -0700315 pr_debug("%s: write 0x%x..0x%x\n",
Kay Sievers160bbab2008-12-23 10:00:14 +0000316 dev_name(&spi->dev), (unsigned)to, (unsigned)(to + len));
David Brownell1d6432f2006-01-08 13:34:22 -0800317
Vitaly Wool8275c642006-01-08 13:34:28 -0800318 spi_message_init(&msg);
319
David Brownell1d6432f2006-01-08 13:34:22 -0800320 x[0].tx_buf = command = priv->command;
321 x[0].len = 4;
Vitaly Wool8275c642006-01-08 13:34:28 -0800322 spi_message_add_tail(&x[0], &msg);
David Brownell1d6432f2006-01-08 13:34:22 -0800323
324 pageaddr = ((unsigned)to / priv->page_size);
325 offset = ((unsigned)to % priv->page_size);
326 if (offset + len > priv->page_size)
327 writelen = priv->page_size - offset;
328 else
329 writelen = len;
330
Matthias Kaehlckeec9ce522007-06-28 22:58:42 +0100331 mutex_lock(&priv->lock);
David Brownell1d6432f2006-01-08 13:34:22 -0800332 while (remaining > 0) {
Brian Norris289c0522011-07-19 10:06:09 -0700333 pr_debug("write @ %i:%i len=%i\n",
David Brownell1d6432f2006-01-08 13:34:22 -0800334 pageaddr, offset, writelen);
335
336 /* REVISIT:
337 * (a) each page in a sector must be rewritten at least
338 * once every 10K sibling erase/program operations.
339 * (b) for pages that are already erased, we could
340 * use WRITE+MWRITE not PROGRAM for ~30% speedup.
341 * (c) WRITE to buffer could be done while waiting for
342 * a previous MWRITE/MWERASE to complete ...
343 * (d) error handling here seems to be mostly missing.
344 *
345 * Two persistent bits per page, plus a per-sector counter,
346 * could support (a) and (b) ... we might consider using
347 * the second half of sector zero, which is just one block,
348 * to track that state. (On AT91, that sector should also
349 * support boot-from-DataFlash.)
350 */
351
352 addr = pageaddr << priv->page_offset;
353
354 /* (1) Maybe transfer partial page to Buffer1 */
355 if (writelen != priv->page_size) {
356 command[0] = OP_TRANSFER_BUF1;
357 command[1] = (addr & 0x00FF0000) >> 16;
358 command[2] = (addr & 0x0000FF00) >> 8;
359 command[3] = 0;
360
Brian Norris289c0522011-07-19 10:06:09 -0700361 pr_debug("TRANSFER: (%x) %x %x %x\n",
David Brownell1d6432f2006-01-08 13:34:22 -0800362 command[0], command[1], command[2], command[3]);
363
David Brownell1d6432f2006-01-08 13:34:22 -0800364 status = spi_sync(spi, &msg);
365 if (status < 0)
Brian Norris0a32a102011-07-19 10:06:10 -0700366 pr_debug("%s: xfer %u -> %d\n",
Kay Sievers160bbab2008-12-23 10:00:14 +0000367 dev_name(&spi->dev), addr, status);
David Brownell1d6432f2006-01-08 13:34:22 -0800368
369 (void) dataflash_waitready(priv->spi);
370 }
371
372 /* (2) Program full page via Buffer1 */
373 addr += offset;
374 command[0] = OP_PROGRAM_VIA_BUF1;
375 command[1] = (addr & 0x00FF0000) >> 16;
376 command[2] = (addr & 0x0000FF00) >> 8;
377 command[3] = (addr & 0x000000FF);
378
Brian Norris289c0522011-07-19 10:06:09 -0700379 pr_debug("PROGRAM: (%x) %x %x %x\n",
David Brownell1d6432f2006-01-08 13:34:22 -0800380 command[0], command[1], command[2], command[3]);
381
382 x[1].tx_buf = writebuf;
383 x[1].len = writelen;
Vitaly Wool8275c642006-01-08 13:34:28 -0800384 spi_message_add_tail(x + 1, &msg);
David Brownell1d6432f2006-01-08 13:34:22 -0800385 status = spi_sync(spi, &msg);
Vitaly Wool8275c642006-01-08 13:34:28 -0800386 spi_transfer_del(x + 1);
David Brownell1d6432f2006-01-08 13:34:22 -0800387 if (status < 0)
Brian Norris0a32a102011-07-19 10:06:10 -0700388 pr_debug("%s: pgm %u/%u -> %d\n",
Kay Sievers160bbab2008-12-23 10:00:14 +0000389 dev_name(&spi->dev), addr, writelen, status);
David Brownell1d6432f2006-01-08 13:34:22 -0800390
391 (void) dataflash_waitready(priv->spi);
392
Vitaly Wool8275c642006-01-08 13:34:28 -0800393
Robert P. J. Day05dd1802009-07-19 21:19:08 -0400394#ifdef CONFIG_MTD_DATAFLASH_WRITE_VERIFY
David Brownell1d6432f2006-01-08 13:34:22 -0800395
396 /* (3) Compare to Buffer1 */
397 addr = pageaddr << priv->page_offset;
398 command[0] = OP_COMPARE_BUF1;
399 command[1] = (addr & 0x00FF0000) >> 16;
400 command[2] = (addr & 0x0000FF00) >> 8;
401 command[3] = 0;
402
Brian Norris289c0522011-07-19 10:06:09 -0700403 pr_debug("COMPARE: (%x) %x %x %x\n",
David Brownell1d6432f2006-01-08 13:34:22 -0800404 command[0], command[1], command[2], command[3]);
405
David Brownell1d6432f2006-01-08 13:34:22 -0800406 status = spi_sync(spi, &msg);
407 if (status < 0)
Brian Norris0a32a102011-07-19 10:06:10 -0700408 pr_debug("%s: compare %u -> %d\n",
Kay Sievers160bbab2008-12-23 10:00:14 +0000409 dev_name(&spi->dev), addr, status);
David Brownell1d6432f2006-01-08 13:34:22 -0800410
411 status = dataflash_waitready(priv->spi);
412
413 /* Check result of the compare operation */
Andrew Victorcccb45d2007-11-19 15:37:23 +0200414 if (status & (1 << 6)) {
David Brownell1d6432f2006-01-08 13:34:22 -0800415 printk(KERN_ERR "%s: compare page %u, err %d\n",
Kay Sievers160bbab2008-12-23 10:00:14 +0000416 dev_name(&spi->dev), pageaddr, status);
David Brownell1d6432f2006-01-08 13:34:22 -0800417 remaining = 0;
418 status = -EIO;
419 break;
420 } else
421 status = 0;
422
Robert P. J. Day05dd1802009-07-19 21:19:08 -0400423#endif /* CONFIG_MTD_DATAFLASH_WRITE_VERIFY */
David Brownell1d6432f2006-01-08 13:34:22 -0800424
425 remaining = remaining - writelen;
426 pageaddr++;
427 offset = 0;
428 writebuf += writelen;
429 *retlen += writelen;
430
431 if (remaining > priv->page_size)
432 writelen = priv->page_size;
433 else
434 writelen = remaining;
435 }
Matthias Kaehlckeec9ce522007-06-28 22:58:42 +0100436 mutex_unlock(&priv->lock);
David Brownell1d6432f2006-01-08 13:34:22 -0800437
438 return status;
439}
440
441/* ......................................................................... */
442
David Brownell34a82442008-07-30 12:35:05 -0700443#ifdef CONFIG_MTD_DATAFLASH_OTP
444
445static int dataflash_get_otp_info(struct mtd_info *mtd,
446 struct otp_info *info, size_t len)
447{
448 /* Report both blocks as identical: bytes 0..64, locked.
449 * Unless the user block changed from all-ones, we can't
450 * tell whether it's still writable; so we assume it isn't.
451 */
452 info->start = 0;
453 info->length = 64;
454 info->locked = 1;
455 return sizeof(*info);
456}
457
458static ssize_t otp_read(struct spi_device *spi, unsigned base,
459 uint8_t *buf, loff_t off, size_t len)
460{
461 struct spi_message m;
462 size_t l;
463 uint8_t *scratch;
464 struct spi_transfer t;
465 int status;
466
467 if (off > 64)
468 return -EINVAL;
469
470 if ((off + len) > 64)
471 len = 64 - off;
David Brownell34a82442008-07-30 12:35:05 -0700472
473 spi_message_init(&m);
474
475 l = 4 + base + off + len;
476 scratch = kzalloc(l, GFP_KERNEL);
477 if (!scratch)
478 return -ENOMEM;
479
480 /* OUT: OP_READ_SECURITY, 3 don't-care bytes, zeroes
481 * IN: ignore 4 bytes, data bytes 0..N (max 127)
482 */
483 scratch[0] = OP_READ_SECURITY;
484
485 memset(&t, 0, sizeof t);
486 t.tx_buf = scratch;
487 t.rx_buf = scratch;
488 t.len = l;
489 spi_message_add_tail(&t, &m);
490
491 dataflash_waitready(spi);
492
493 status = spi_sync(spi, &m);
494 if (status >= 0) {
495 memcpy(buf, scratch + 4 + base + off, len);
496 status = len;
497 }
498
499 kfree(scratch);
500 return status;
501}
502
503static int dataflash_read_fact_otp(struct mtd_info *mtd,
504 loff_t from, size_t len, size_t *retlen, u_char *buf)
505{
Kulikov Vasiliy42845d22010-06-29 14:15:13 +0400506 struct dataflash *priv = mtd->priv;
David Brownell34a82442008-07-30 12:35:05 -0700507 int status;
508
509 /* 64 bytes, from 0..63 ... start at 64 on-chip */
510 mutex_lock(&priv->lock);
511 status = otp_read(priv->spi, 64, buf, from, len);
512 mutex_unlock(&priv->lock);
513
514 if (status < 0)
515 return status;
516 *retlen = status;
517 return 0;
518}
519
520static int dataflash_read_user_otp(struct mtd_info *mtd,
521 loff_t from, size_t len, size_t *retlen, u_char *buf)
522{
Kulikov Vasiliy42845d22010-06-29 14:15:13 +0400523 struct dataflash *priv = mtd->priv;
David Brownell34a82442008-07-30 12:35:05 -0700524 int status;
525
526 /* 64 bytes, from 0..63 ... start at 0 on-chip */
527 mutex_lock(&priv->lock);
528 status = otp_read(priv->spi, 0, buf, from, len);
529 mutex_unlock(&priv->lock);
530
531 if (status < 0)
532 return status;
533 *retlen = status;
534 return 0;
535}
536
537static int dataflash_write_user_otp(struct mtd_info *mtd,
538 loff_t from, size_t len, size_t *retlen, u_char *buf)
539{
540 struct spi_message m;
541 const size_t l = 4 + 64;
542 uint8_t *scratch;
543 struct spi_transfer t;
Kulikov Vasiliy42845d22010-06-29 14:15:13 +0400544 struct dataflash *priv = mtd->priv;
David Brownell34a82442008-07-30 12:35:05 -0700545 int status;
546
547 if (len > 64)
548 return -EINVAL;
549
550 /* Strictly speaking, we *could* truncate the write ... but
551 * let's not do that for the only write that's ever possible.
552 */
553 if ((from + len) > 64)
554 return -EINVAL;
555
556 /* OUT: OP_WRITE_SECURITY, 3 zeroes, 64 data-or-zero bytes
557 * IN: ignore all
558 */
559 scratch = kzalloc(l, GFP_KERNEL);
560 if (!scratch)
561 return -ENOMEM;
562 scratch[0] = OP_WRITE_SECURITY;
563 memcpy(scratch + 4 + from, buf, len);
564
565 spi_message_init(&m);
566
567 memset(&t, 0, sizeof t);
568 t.tx_buf = scratch;
569 t.len = l;
570 spi_message_add_tail(&t, &m);
571
572 /* Write the OTP bits, if they've not yet been written.
573 * This modifies SRAM buffer1.
574 */
575 mutex_lock(&priv->lock);
576 dataflash_waitready(priv->spi);
577 status = spi_sync(priv->spi, &m);
578 mutex_unlock(&priv->lock);
579
580 kfree(scratch);
581
582 if (status >= 0) {
583 status = 0;
584 *retlen = len;
585 }
586 return status;
587}
588
589static char *otp_setup(struct mtd_info *device, char revision)
590{
Artem Bityutskiy3c3c10b2012-01-30 14:58:32 +0200591 device->_get_fact_prot_info = dataflash_get_otp_info;
592 device->_read_fact_prot_reg = dataflash_read_fact_otp;
593 device->_get_user_prot_info = dataflash_get_otp_info;
594 device->_read_user_prot_reg = dataflash_read_user_otp;
David Brownell34a82442008-07-30 12:35:05 -0700595
596 /* rev c parts (at45db321c and at45db1281 only!) use a
597 * different write procedure; not (yet?) implemented.
598 */
599 if (revision > 'c')
Artem Bityutskiy3c3c10b2012-01-30 14:58:32 +0200600 device->_write_user_prot_reg = dataflash_write_user_otp;
David Brownell34a82442008-07-30 12:35:05 -0700601
602 return ", OTP";
603}
604
605#else
606
David Brownellcf93ae02008-08-06 13:12:04 -0700607static char *otp_setup(struct mtd_info *device, char revision)
David Brownell34a82442008-07-30 12:35:05 -0700608{
609 return " (OTP)";
610}
611
612#endif
613
614/* ......................................................................... */
615
David Brownell1d6432f2006-01-08 13:34:22 -0800616/*
617 * Register DataFlash device with MTD subsystem.
618 */
Greg Kroah-Hartmand8929942012-12-21 13:19:05 -0800619static int add_dataflash_otp(struct spi_device *spi, char *name, int nr_pages,
620 int pagesize, int pageoffset, char revision)
David Brownell1d6432f2006-01-08 13:34:22 -0800621{
622 struct dataflash *priv;
623 struct mtd_info *device;
Shawn Guob94e7572011-07-15 16:38:56 +0800624 struct mtd_part_parser_data ppdata;
David Brownell1d6432f2006-01-08 13:34:22 -0800625 struct flash_platform_data *pdata = spi->dev.platform_data;
David Brownell34a82442008-07-30 12:35:05 -0700626 char *otp_tag = "";
H Hartley Sweetend4702662009-10-07 17:08:08 -0400627 int err = 0;
David Brownell1d6432f2006-01-08 13:34:22 -0800628
Robert P. J. Day5cbded52006-12-13 00:35:56 -0800629 priv = kzalloc(sizeof *priv, GFP_KERNEL);
David Brownell1d6432f2006-01-08 13:34:22 -0800630 if (!priv)
631 return -ENOMEM;
632
Matthias Kaehlckeec9ce522007-06-28 22:58:42 +0100633 mutex_init(&priv->lock);
David Brownell1d6432f2006-01-08 13:34:22 -0800634 priv->spi = spi;
635 priv->page_size = pagesize;
636 priv->page_offset = pageoffset;
637
638 /* name must be usable with cmdlinepart */
639 sprintf(priv->name, "spi%d.%d-%s",
640 spi->master->bus_num, spi->chip_select,
641 name);
642
643 device = &priv->mtd;
644 device->name = (pdata && pdata->name) ? pdata->name : priv->name;
645 device->size = nr_pages * pagesize;
646 device->erasesize = pagesize;
Artem B. Bityutskiy17ffc7b2006-06-22 18:15:48 +0400647 device->writesize = pagesize;
David Brownell1d6432f2006-01-08 13:34:22 -0800648 device->owner = THIS_MODULE;
649 device->type = MTD_DATAFLASH;
Haavard Skinnemoen6c33caf2006-11-29 14:26:07 +0100650 device->flags = MTD_WRITEABLE;
Artem Bityutskiy3c3c10b2012-01-30 14:58:32 +0200651 device->_erase = dataflash_erase;
652 device->_read = dataflash_read;
653 device->_write = dataflash_write;
David Brownell1d6432f2006-01-08 13:34:22 -0800654 device->priv = priv;
655
David Brownell87f39f02009-03-26 00:42:50 -0700656 device->dev.parent = &spi->dev;
657
David Brownell34a82442008-07-30 12:35:05 -0700658 if (revision >= 'c')
659 otp_tag = otp_setup(device, revision);
660
Artem Bityutskiy5b7f3a52008-12-18 14:09:56 +0200661 dev_info(&spi->dev, "%s (%lld KBytes) pagesize %d bytes%s\n",
662 name, (long long)((device->size + 1023) >> 10),
David Brownell34a82442008-07-30 12:35:05 -0700663 pagesize, otp_tag);
Jingoo Han5cacbfa2013-04-06 15:41:03 +0900664 spi_set_drvdata(spi, priv);
David Brownell1d6432f2006-01-08 13:34:22 -0800665
Shawn Guob94e7572011-07-15 16:38:56 +0800666 ppdata.of_node = spi->dev.of_node;
667 err = mtd_device_parse_register(device, NULL, &ppdata,
Dmitry Eremin-Solenikov3a8fb122011-06-02 17:59:18 +0400668 pdata ? pdata->parts : NULL,
669 pdata ? pdata->nr_parts : 0);
David Brownell1d6432f2006-01-08 13:34:22 -0800670
H Hartley Sweetend4702662009-10-07 17:08:08 -0400671 if (!err)
672 return 0;
673
Jingoo Han5cacbfa2013-04-06 15:41:03 +0900674 spi_set_drvdata(spi, NULL);
H Hartley Sweetend4702662009-10-07 17:08:08 -0400675 kfree(priv);
676 return err;
David Brownell1d6432f2006-01-08 13:34:22 -0800677}
678
Greg Kroah-Hartmand8929942012-12-21 13:19:05 -0800679static inline int add_dataflash(struct spi_device *spi, char *name,
680 int nr_pages, int pagesize, int pageoffset)
David Brownell34a82442008-07-30 12:35:05 -0700681{
682 return add_dataflash_otp(spi, name, nr_pages, pagesize,
683 pageoffset, 0);
684}
685
Michael Henneriche9d42222008-06-03 12:26:05 +0800686struct flash_info {
687 char *name;
688
akpm@linux-foundation.org771999b2008-07-29 22:22:40 -0700689 /* JEDEC id has a high byte of zero plus three data bytes:
690 * the manufacturer id, then a two byte device id.
Michael Henneriche9d42222008-06-03 12:26:05 +0800691 */
David Woodhouse271c5c52008-06-04 17:43:22 +0100692 uint32_t jedec_id;
Michael Henneriche9d42222008-06-03 12:26:05 +0800693
akpm@linux-foundation.org771999b2008-07-29 22:22:40 -0700694 /* The size listed here is what works with OP_ERASE_PAGE. */
Michael Henneriche9d42222008-06-03 12:26:05 +0800695 unsigned nr_pages;
David Woodhouse271c5c52008-06-04 17:43:22 +0100696 uint16_t pagesize;
697 uint16_t pageoffset;
Michael Henneriche9d42222008-06-03 12:26:05 +0800698
David Woodhouse271c5c52008-06-04 17:43:22 +0100699 uint16_t flags;
akpm@linux-foundation.org771999b2008-07-29 22:22:40 -0700700#define SUP_POW2PS 0x0002 /* supports 2^N byte pages */
701#define IS_POW2PS 0x0001 /* uses 2^N byte pages */
Michael Henneriche9d42222008-06-03 12:26:05 +0800702};
703
Artem Bityutskiy7bf350b72012-11-22 12:16:28 +0200704static struct flash_info dataflash_data[] = {
Michael Henneriche9d42222008-06-03 12:26:05 +0800705
akpm@linux-foundation.org771999b2008-07-29 22:22:40 -0700706 /*
707 * NOTE: chips with SUP_POW2PS (rev D and up) need two entries,
708 * one with IS_POW2PS and the other without. The entry with the
709 * non-2^N byte page size can't name exact chip revisions without
710 * losing backwards compatibility for cmdlinepart.
711 *
712 * These newer chips also support 128-byte security registers (with
713 * 64 bytes one-time-programmable) and software write-protection.
714 */
715 { "AT45DB011B", 0x1f2200, 512, 264, 9, SUP_POW2PS},
Michael Henneriche9d42222008-06-03 12:26:05 +0800716 { "at45db011d", 0x1f2200, 512, 256, 8, SUP_POW2PS | IS_POW2PS},
717
akpm@linux-foundation.org771999b2008-07-29 22:22:40 -0700718 { "AT45DB021B", 0x1f2300, 1024, 264, 9, SUP_POW2PS},
Michael Henneriche9d42222008-06-03 12:26:05 +0800719 { "at45db021d", 0x1f2300, 1024, 256, 8, SUP_POW2PS | IS_POW2PS},
720
akpm@linux-foundation.org771999b2008-07-29 22:22:40 -0700721 { "AT45DB041x", 0x1f2400, 2048, 264, 9, SUP_POW2PS},
Michael Henneriche9d42222008-06-03 12:26:05 +0800722 { "at45db041d", 0x1f2400, 2048, 256, 8, SUP_POW2PS | IS_POW2PS},
723
akpm@linux-foundation.org771999b2008-07-29 22:22:40 -0700724 { "AT45DB081B", 0x1f2500, 4096, 264, 9, SUP_POW2PS},
Michael Henneriche9d42222008-06-03 12:26:05 +0800725 { "at45db081d", 0x1f2500, 4096, 256, 8, SUP_POW2PS | IS_POW2PS},
726
akpm@linux-foundation.org771999b2008-07-29 22:22:40 -0700727 { "AT45DB161x", 0x1f2600, 4096, 528, 10, SUP_POW2PS},
Michael Henneriche9d42222008-06-03 12:26:05 +0800728 { "at45db161d", 0x1f2600, 4096, 512, 9, SUP_POW2PS | IS_POW2PS},
729
akpm@linux-foundation.org771999b2008-07-29 22:22:40 -0700730 { "AT45DB321x", 0x1f2700, 8192, 528, 10, 0}, /* rev C */
Michael Henneriche9d42222008-06-03 12:26:05 +0800731
akpm@linux-foundation.org771999b2008-07-29 22:22:40 -0700732 { "AT45DB321x", 0x1f2701, 8192, 528, 10, SUP_POW2PS},
Michael Henneriche9d42222008-06-03 12:26:05 +0800733 { "at45db321d", 0x1f2701, 8192, 512, 9, SUP_POW2PS | IS_POW2PS},
734
akpm@linux-foundation.org771999b2008-07-29 22:22:40 -0700735 { "AT45DB642x", 0x1f2800, 8192, 1056, 11, SUP_POW2PS},
736 { "at45db642d", 0x1f2800, 8192, 1024, 10, SUP_POW2PS | IS_POW2PS},
Michael Henneriche9d42222008-06-03 12:26:05 +0800737};
738
Bill Pemberton06f25512012-11-19 13:23:07 -0500739static struct flash_info *jedec_probe(struct spi_device *spi)
Michael Henneriche9d42222008-06-03 12:26:05 +0800740{
741 int tmp;
David Woodhouse271c5c52008-06-04 17:43:22 +0100742 uint8_t code = OP_READ_ID;
743 uint8_t id[3];
744 uint32_t jedec;
Michael Henneriche9d42222008-06-03 12:26:05 +0800745 struct flash_info *info;
746 int status;
747
Michael Henneriche9d42222008-06-03 12:26:05 +0800748 /* JEDEC also defines an optional "extended device information"
749 * string for after vendor-specific data, after the three bytes
750 * we use here. Supporting some chips might require using it.
akpm@linux-foundation.org771999b2008-07-29 22:22:40 -0700751 *
752 * If the vendor ID isn't Atmel's (0x1f), assume this call failed.
753 * That's not an error; only rev C and newer chips handle it, and
754 * only Atmel sells these chips.
Michael Henneriche9d42222008-06-03 12:26:05 +0800755 */
756 tmp = spi_write_then_read(spi, &code, 1, id, 3);
757 if (tmp < 0) {
Brian Norris289c0522011-07-19 10:06:09 -0700758 pr_debug("%s: error %d reading JEDEC ID\n",
Kay Sievers160bbab2008-12-23 10:00:14 +0000759 dev_name(&spi->dev), tmp);
akpm@linux-foundation.org771999b2008-07-29 22:22:40 -0700760 return ERR_PTR(tmp);
Michael Henneriche9d42222008-06-03 12:26:05 +0800761 }
akpm@linux-foundation.org771999b2008-07-29 22:22:40 -0700762 if (id[0] != 0x1f)
763 return NULL;
764
Michael Henneriche9d42222008-06-03 12:26:05 +0800765 jedec = id[0];
766 jedec = jedec << 8;
767 jedec |= id[1];
768 jedec = jedec << 8;
769 jedec |= id[2];
770
771 for (tmp = 0, info = dataflash_data;
772 tmp < ARRAY_SIZE(dataflash_data);
773 tmp++, info++) {
774 if (info->jedec_id == jedec) {
Brian Norris289c0522011-07-19 10:06:09 -0700775 pr_debug("%s: OTP, sector protect%s\n",
akpm@linux-foundation.org771999b2008-07-29 22:22:40 -0700776 dev_name(&spi->dev),
777 (info->flags & SUP_POW2PS)
778 ? ", binary pagesize" : ""
779 );
Michael Henneriche9d42222008-06-03 12:26:05 +0800780 if (info->flags & SUP_POW2PS) {
781 status = dataflash_status(spi);
akpm@linux-foundation.org771999b2008-07-29 22:22:40 -0700782 if (status < 0) {
Brian Norris289c0522011-07-19 10:06:09 -0700783 pr_debug("%s: status error %d\n",
akpm@linux-foundation.org771999b2008-07-29 22:22:40 -0700784 dev_name(&spi->dev), status);
785 return ERR_PTR(status);
786 }
787 if (status & 0x1) {
788 if (info->flags & IS_POW2PS)
789 return info;
790 } else {
791 if (!(info->flags & IS_POW2PS))
792 return info;
793 }
Will Newton229cc582009-03-10 12:55:53 -0700794 } else
795 return info;
Michael Henneriche9d42222008-06-03 12:26:05 +0800796 }
797 }
akpm@linux-foundation.org771999b2008-07-29 22:22:40 -0700798
799 /*
800 * Treat other chips as errors ... we won't know the right page
801 * size (it might be binary) even when we can tell which density
802 * class is involved (legacy chip id scheme).
803 */
804 dev_warn(&spi->dev, "JEDEC id %06x not handled\n", jedec);
805 return ERR_PTR(-ENODEV);
Michael Henneriche9d42222008-06-03 12:26:05 +0800806}
807
akpm@linux-foundation.org771999b2008-07-29 22:22:40 -0700808/*
809 * Detect and initialize DataFlash device, using JEDEC IDs on newer chips
810 * or else the ID code embedded in the status bits:
811 *
812 * Device Density ID code #Pages PageSize Offset
813 * AT45DB011B 1Mbit (128K) xx0011xx (0x0c) 512 264 9
814 * AT45DB021B 2Mbit (256K) xx0101xx (0x14) 1024 264 9
815 * AT45DB041B 4Mbit (512K) xx0111xx (0x1c) 2048 264 9
816 * AT45DB081B 8Mbit (1M) xx1001xx (0x24) 4096 264 9
817 * AT45DB0161B 16Mbit (2M) xx1011xx (0x2c) 4096 528 10
818 * AT45DB0321B 32Mbit (4M) xx1101xx (0x34) 8192 528 10
819 * AT45DB0642 64Mbit (8M) xx111xxx (0x3c) 8192 1056 11
820 * AT45DB1282 128Mbit (16M) xx0100xx (0x10) 16384 1056 11
821 */
Bill Pemberton06f25512012-11-19 13:23:07 -0500822static int dataflash_probe(struct spi_device *spi)
David Brownell1d6432f2006-01-08 13:34:22 -0800823{
824 int status;
Michael Henneriche9d42222008-06-03 12:26:05 +0800825 struct flash_info *info;
826
827 /*
828 * Try to detect dataflash by JEDEC ID.
829 * If it succeeds we know we have either a C or D part.
830 * D will support power of 2 pagesize option.
David Brownell34a82442008-07-30 12:35:05 -0700831 * Both support the security register, though with different
832 * write procedures.
Michael Henneriche9d42222008-06-03 12:26:05 +0800833 */
Michael Henneriche9d42222008-06-03 12:26:05 +0800834 info = jedec_probe(spi);
akpm@linux-foundation.org771999b2008-07-29 22:22:40 -0700835 if (IS_ERR(info))
836 return PTR_ERR(info);
Michael Henneriche9d42222008-06-03 12:26:05 +0800837 if (info != NULL)
David Brownell34a82442008-07-30 12:35:05 -0700838 return add_dataflash_otp(spi, info->name, info->nr_pages,
839 info->pagesize, info->pageoffset,
840 (info->flags & SUP_POW2PS) ? 'd' : 'c');
Michael Henneriche9d42222008-06-03 12:26:05 +0800841
akpm@linux-foundation.org771999b2008-07-29 22:22:40 -0700842 /*
843 * Older chips support only legacy commands, identifing
844 * capacity using bits in the status byte.
845 */
David Brownell1d6432f2006-01-08 13:34:22 -0800846 status = dataflash_status(spi);
847 if (status <= 0 || status == 0xff) {
Brian Norris289c0522011-07-19 10:06:09 -0700848 pr_debug("%s: status error %d\n",
Kay Sievers160bbab2008-12-23 10:00:14 +0000849 dev_name(&spi->dev), status);
David Brownellde4fa99262006-12-29 16:48:47 -0800850 if (status == 0 || status == 0xff)
David Brownell1d6432f2006-01-08 13:34:22 -0800851 status = -ENODEV;
852 return status;
853 }
854
855 /* if there's a device there, assume it's dataflash.
856 * board setup should have set spi->max_speed_max to
857 * match f(car) for continuous reads, mode 0 or 3.
858 */
859 switch (status & 0x3c) {
860 case 0x0c: /* 0 0 1 1 x x */
861 status = add_dataflash(spi, "AT45DB011B", 512, 264, 9);
862 break;
863 case 0x14: /* 0 1 0 1 x x */
Michael Henneriche9d42222008-06-03 12:26:05 +0800864 status = add_dataflash(spi, "AT45DB021B", 1024, 264, 9);
David Brownell1d6432f2006-01-08 13:34:22 -0800865 break;
866 case 0x1c: /* 0 1 1 1 x x */
akpm@linux-foundation.org771999b2008-07-29 22:22:40 -0700867 status = add_dataflash(spi, "AT45DB041x", 2048, 264, 9);
David Brownell1d6432f2006-01-08 13:34:22 -0800868 break;
869 case 0x24: /* 1 0 0 1 x x */
870 status = add_dataflash(spi, "AT45DB081B", 4096, 264, 9);
871 break;
872 case 0x2c: /* 1 0 1 1 x x */
akpm@linux-foundation.org771999b2008-07-29 22:22:40 -0700873 status = add_dataflash(spi, "AT45DB161x", 4096, 528, 10);
David Brownell1d6432f2006-01-08 13:34:22 -0800874 break;
875 case 0x34: /* 1 1 0 1 x x */
876 status = add_dataflash(spi, "AT45DB321x", 8192, 528, 10);
877 break;
878 case 0x38: /* 1 1 1 x x x */
879 case 0x3c:
880 status = add_dataflash(spi, "AT45DB642x", 8192, 1056, 11);
881 break;
882 /* obsolete AT45DB1282 not (yet?) supported */
883 default:
Brian Norris0a32a102011-07-19 10:06:10 -0700884 pr_debug("%s: unsupported device (%x)\n", dev_name(&spi->dev),
885 status & 0x3c);
David Brownell1d6432f2006-01-08 13:34:22 -0800886 status = -ENODEV;
887 }
888
889 if (status < 0)
Brian Norris0a32a102011-07-19 10:06:10 -0700890 pr_debug("%s: add_dataflash --> %d\n", dev_name(&spi->dev),
891 status);
David Brownell1d6432f2006-01-08 13:34:22 -0800892
893 return status;
894}
895
Bill Pemberton810b7e02012-11-19 13:26:04 -0500896static int dataflash_remove(struct spi_device *spi)
David Brownell1d6432f2006-01-08 13:34:22 -0800897{
Jingoo Han5cacbfa2013-04-06 15:41:03 +0900898 struct dataflash *flash = spi_get_drvdata(spi);
David Brownell1d6432f2006-01-08 13:34:22 -0800899 int status;
900
Brian Norris289c0522011-07-19 10:06:09 -0700901 pr_debug("%s: remove\n", dev_name(&spi->dev));
David Brownell1d6432f2006-01-08 13:34:22 -0800902
Jamie Iles436c06d2011-05-23 10:22:58 +0100903 status = mtd_device_unregister(&flash->mtd);
H Hartley Sweetend4702662009-10-07 17:08:08 -0400904 if (status == 0) {
Jingoo Han5cacbfa2013-04-06 15:41:03 +0900905 spi_set_drvdata(spi, NULL);
David Brownell1d6432f2006-01-08 13:34:22 -0800906 kfree(flash);
H Hartley Sweetend4702662009-10-07 17:08:08 -0400907 }
David Brownell1d6432f2006-01-08 13:34:22 -0800908 return status;
909}
910
911static struct spi_driver dataflash_driver = {
912 .driver = {
913 .name = "mtd_dataflash",
David Brownell1d6432f2006-01-08 13:34:22 -0800914 .owner = THIS_MODULE,
Sachin Kamat19d69b82013-03-14 15:37:00 +0530915 .of_match_table = of_match_ptr(dataflash_dt_ids),
David Brownell1d6432f2006-01-08 13:34:22 -0800916 },
917
918 .probe = dataflash_probe,
Bill Pemberton5153b882012-11-19 13:21:24 -0500919 .remove = dataflash_remove,
David Brownell1d6432f2006-01-08 13:34:22 -0800920
921 /* FIXME: investigate suspend and resume... */
922};
923
Axel Linc9d1b752012-01-27 15:45:20 +0800924module_spi_driver(dataflash_driver);
David Brownell1d6432f2006-01-08 13:34:22 -0800925
926MODULE_LICENSE("GPL");
927MODULE_AUTHOR("Andrew Victor, David Brownell");
928MODULE_DESCRIPTION("MTD DataFlash driver");
Anton Vorontsove0626e32009-09-22 16:46:08 -0700929MODULE_ALIAS("spi:mtd_dataflash");