blob: f9e9bd1cfaa034a4e79f0d4458ca90d47236a6f3 [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>
David Brownell1d6432f2006-01-08 13:34:22 -080013#include <linux/slab.h>
14#include <linux/delay.h>
15#include <linux/device.h>
Matthias Kaehlckeec9ce522007-06-28 22:58:42 +010016#include <linux/mutex.h>
akpm@linux-foundation.org771999b2008-07-29 22:22:40 -070017#include <linux/err.h>
Artem Bityutskiy5b7f3a52008-12-18 14:09:56 +020018#include <linux/math64.h>
Shawn Guob94e7572011-07-15 16:38:56 +080019#include <linux/of.h>
20#include <linux/of_device.h>
akpm@linux-foundation.org771999b2008-07-29 22:22:40 -070021
David Brownell1d6432f2006-01-08 13:34:22 -080022#include <linux/spi/spi.h>
23#include <linux/spi/flash.h>
24
25#include <linux/mtd/mtd.h>
26#include <linux/mtd/partitions.h>
27
David Brownell1d6432f2006-01-08 13:34:22 -080028/*
29 * DataFlash is a kind of SPI flash. Most AT45 chips have two buffers in
30 * each chip, which may be used for double buffered I/O; but this driver
31 * doesn't (yet) use these for any kind of i/o overlap or prefetching.
32 *
33 * Sometimes DataFlash is packaged in MMC-format cards, although the
David Brownell8c640382008-08-06 21:55:14 -070034 * MMC stack can't (yet?) distinguish between MMC and DataFlash
David Brownell1d6432f2006-01-08 13:34:22 -080035 * protocols during enumeration.
36 */
37
David Brownell1d6432f2006-01-08 13:34:22 -080038/* reads can bypass the buffers */
39#define OP_READ_CONTINUOUS 0xE8
40#define OP_READ_PAGE 0xD2
41
42/* group B requests can run even while status reports "busy" */
43#define OP_READ_STATUS 0xD7 /* group B */
44
45/* move data between host and buffer */
46#define OP_READ_BUFFER1 0xD4 /* group B */
47#define OP_READ_BUFFER2 0xD6 /* group B */
48#define OP_WRITE_BUFFER1 0x84 /* group B */
49#define OP_WRITE_BUFFER2 0x87 /* group B */
50
51/* erasing flash */
52#define OP_ERASE_PAGE 0x81
53#define OP_ERASE_BLOCK 0x50
54
55/* move data between buffer and flash */
56#define OP_TRANSFER_BUF1 0x53
57#define OP_TRANSFER_BUF2 0x55
58#define OP_MREAD_BUFFER1 0xD4
59#define OP_MREAD_BUFFER2 0xD6
60#define OP_MWERASE_BUFFER1 0x83
61#define OP_MWERASE_BUFFER2 0x86
62#define OP_MWRITE_BUFFER1 0x88 /* sector must be pre-erased */
63#define OP_MWRITE_BUFFER2 0x89 /* sector must be pre-erased */
64
65/* write to buffer, then write-erase to flash */
66#define OP_PROGRAM_VIA_BUF1 0x82
67#define OP_PROGRAM_VIA_BUF2 0x85
68
69/* compare buffer to flash */
70#define OP_COMPARE_BUF1 0x60
71#define OP_COMPARE_BUF2 0x61
72
73/* read flash to buffer, then write-erase to flash */
74#define OP_REWRITE_VIA_BUF1 0x58
75#define OP_REWRITE_VIA_BUF2 0x59
76
77/* newer chips report JEDEC manufacturer and device IDs; chip
78 * serial number and OTP bits; and per-sector writeprotect.
79 */
80#define OP_READ_ID 0x9F
81#define OP_READ_SECURITY 0x77
David Brownell34a82442008-07-30 12:35:05 -070082#define OP_WRITE_SECURITY_REVC 0x9A
83#define OP_WRITE_SECURITY 0x9B /* revision D */
David Brownell1d6432f2006-01-08 13:34:22 -080084
85
86struct dataflash {
David Woodhouse271c5c52008-06-04 17:43:22 +010087 uint8_t command[4];
David Brownell1d6432f2006-01-08 13:34:22 -080088 char name[24];
89
David Brownell1d6432f2006-01-08 13:34:22 -080090 unsigned short page_offset; /* offset in flash address */
91 unsigned int page_size; /* of bytes per page */
92
Matthias Kaehlckeec9ce522007-06-28 22:58:42 +010093 struct mutex lock;
David Brownell1d6432f2006-01-08 13:34:22 -080094 struct spi_device *spi;
95
96 struct mtd_info mtd;
97};
98
Shawn Guob94e7572011-07-15 16:38:56 +080099#ifdef CONFIG_OF
100static const struct of_device_id dataflash_dt_ids[] = {
101 { .compatible = "atmel,at45", },
102 { .compatible = "atmel,dataflash", },
103 { /* sentinel */ }
104};
Javier Martinez Canillasd1d97b72015-08-20 09:07:16 +0200105MODULE_DEVICE_TABLE(of, dataflash_dt_ids);
Shawn Guob94e7572011-07-15 16:38:56 +0800106#endif
107
David Brownell1d6432f2006-01-08 13:34:22 -0800108/* ......................................................................... */
109
110/*
111 * Return the status of the DataFlash device.
112 */
113static inline int dataflash_status(struct spi_device *spi)
114{
115 /* NOTE: at45db321c over 25 MHz wants to write
116 * a dummy byte after the opcode...
117 */
118 return spi_w8r8(spi, OP_READ_STATUS);
119}
120
121/*
122 * Poll the DataFlash device until it is READY.
123 * This usually takes 5-20 msec or so; more for sector erase.
124 */
125static int dataflash_waitready(struct spi_device *spi)
126{
127 int status;
128
129 for (;;) {
130 status = dataflash_status(spi);
131 if (status < 0) {
Brian Norris289c0522011-07-19 10:06:09 -0700132 pr_debug("%s: status %d?\n",
Kay Sievers160bbab2008-12-23 10:00:14 +0000133 dev_name(&spi->dev), status);
David Brownell1d6432f2006-01-08 13:34:22 -0800134 status = 0;
135 }
136
137 if (status & (1 << 7)) /* RDY/nBSY */
138 return status;
139
140 msleep(3);
141 }
142}
143
144/* ......................................................................... */
145
146/*
147 * Erase pages of flash.
148 */
149static int dataflash_erase(struct mtd_info *mtd, struct erase_info *instr)
150{
Kulikov Vasiliy42845d22010-06-29 14:15:13 +0400151 struct dataflash *priv = mtd->priv;
David Brownell1d6432f2006-01-08 13:34:22 -0800152 struct spi_device *spi = priv->spi;
Mark Brown7a95db02014-10-29 12:27:32 +0000153 struct spi_transfer x = { };
David Brownell1d6432f2006-01-08 13:34:22 -0800154 struct spi_message msg;
155 unsigned blocksize = priv->page_size << 3;
David Woodhouse271c5c52008-06-04 17:43:22 +0100156 uint8_t *command;
Artem Bityutskiy5b7f3a52008-12-18 14:09:56 +0200157 uint32_t rem;
David Brownell1d6432f2006-01-08 13:34:22 -0800158
Brian Norris289c0522011-07-19 10:06:09 -0700159 pr_debug("%s: erase addr=0x%llx len 0x%llx\n",
Kay Sievers160bbab2008-12-23 10:00:14 +0000160 dev_name(&spi->dev), (long long)instr->addr,
161 (long long)instr->len);
David Brownell1d6432f2006-01-08 13:34:22 -0800162
Artem Bityutskiy5b7f3a52008-12-18 14:09:56 +0200163 div_u64_rem(instr->len, priv->page_size, &rem);
164 if (rem)
165 return -EINVAL;
166 div_u64_rem(instr->addr, priv->page_size, &rem);
167 if (rem)
David Brownell1d6432f2006-01-08 13:34:22 -0800168 return -EINVAL;
169
Vitaly Wool8275c642006-01-08 13:34:28 -0800170 spi_message_init(&msg);
171
172 x.tx_buf = command = priv->command;
173 x.len = 4;
174 spi_message_add_tail(&x, &msg);
David Brownell1d6432f2006-01-08 13:34:22 -0800175
Matthias Kaehlckeec9ce522007-06-28 22:58:42 +0100176 mutex_lock(&priv->lock);
David Brownell1d6432f2006-01-08 13:34:22 -0800177 while (instr->len > 0) {
178 unsigned int pageaddr;
179 int status;
180 int do_block;
181
182 /* Calculate flash page address; use block erase (for speed) if
183 * we're at a block boundary and need to erase the whole block.
184 */
Peter Korsgaarddbf8c112009-05-18 11:13:54 +0100185 pageaddr = div_u64(instr->addr, priv->page_size);
David Brownell3cb4f092006-03-13 21:20:40 -0800186 do_block = (pageaddr & 0x7) == 0 && instr->len >= blocksize;
David Brownell1d6432f2006-01-08 13:34:22 -0800187 pageaddr = pageaddr << priv->page_offset;
188
189 command[0] = do_block ? OP_ERASE_BLOCK : OP_ERASE_PAGE;
David Woodhouse271c5c52008-06-04 17:43:22 +0100190 command[1] = (uint8_t)(pageaddr >> 16);
191 command[2] = (uint8_t)(pageaddr >> 8);
David Brownell1d6432f2006-01-08 13:34:22 -0800192 command[3] = 0;
193
Brian Norris289c0522011-07-19 10:06:09 -0700194 pr_debug("ERASE %s: (%x) %x %x %x [%i]\n",
David Brownell1d6432f2006-01-08 13:34:22 -0800195 do_block ? "block" : "page",
196 command[0], command[1], command[2], command[3],
197 pageaddr);
198
199 status = spi_sync(spi, &msg);
200 (void) dataflash_waitready(spi);
201
202 if (status < 0) {
203 printk(KERN_ERR "%s: erase %x, err %d\n",
Kay Sievers160bbab2008-12-23 10:00:14 +0000204 dev_name(&spi->dev), pageaddr, status);
David Brownell1d6432f2006-01-08 13:34:22 -0800205 /* REVISIT: can retry instr->retries times; or
206 * giveup and instr->fail_addr = instr->addr;
207 */
208 continue;
209 }
210
211 if (do_block) {
212 instr->addr += blocksize;
213 instr->len -= blocksize;
214 } else {
215 instr->addr += priv->page_size;
216 instr->len -= priv->page_size;
217 }
218 }
Matthias Kaehlckeec9ce522007-06-28 22:58:42 +0100219 mutex_unlock(&priv->lock);
David Brownell1d6432f2006-01-08 13:34:22 -0800220
221 /* Inform MTD subsystem that erase is complete */
222 instr->state = MTD_ERASE_DONE;
223 mtd_erase_callback(instr);
224
225 return 0;
226}
227
228/*
229 * Read from the DataFlash device.
230 * from : Start offset in flash device
231 * len : Amount to read
232 * retlen : About of data actually read
233 * buf : Buffer containing the data
234 */
235static int dataflash_read(struct mtd_info *mtd, loff_t from, size_t len,
236 size_t *retlen, u_char *buf)
237{
Kulikov Vasiliy42845d22010-06-29 14:15:13 +0400238 struct dataflash *priv = mtd->priv;
Mark Brown7a95db02014-10-29 12:27:32 +0000239 struct spi_transfer x[2] = { };
David Brownell1d6432f2006-01-08 13:34:22 -0800240 struct spi_message msg;
241 unsigned int addr;
David Woodhouse271c5c52008-06-04 17:43:22 +0100242 uint8_t *command;
David Brownell1d6432f2006-01-08 13:34:22 -0800243 int status;
244
Brian Norris0a32a102011-07-19 10:06:10 -0700245 pr_debug("%s: read 0x%x..0x%x\n", dev_name(&priv->spi->dev),
246 (unsigned)from, (unsigned)(from + len));
David Brownell1d6432f2006-01-08 13:34:22 -0800247
David Brownell1d6432f2006-01-08 13:34:22 -0800248 /* Calculate flash page/byte address */
249 addr = (((unsigned)from / priv->page_size) << priv->page_offset)
250 + ((unsigned)from % priv->page_size);
251
252 command = priv->command;
253
Brian Norris289c0522011-07-19 10:06:09 -0700254 pr_debug("READ: (%x) %x %x %x\n",
David Brownell1d6432f2006-01-08 13:34:22 -0800255 command[0], command[1], command[2], command[3]);
256
Vitaly Wool8275c642006-01-08 13:34:28 -0800257 spi_message_init(&msg);
258
David Brownell1d6432f2006-01-08 13:34:22 -0800259 x[0].tx_buf = command;
260 x[0].len = 8;
Vitaly Wool8275c642006-01-08 13:34:28 -0800261 spi_message_add_tail(&x[0], &msg);
262
David Brownell1d6432f2006-01-08 13:34:22 -0800263 x[1].rx_buf = buf;
264 x[1].len = len;
Vitaly Wool8275c642006-01-08 13:34:28 -0800265 spi_message_add_tail(&x[1], &msg);
David Brownell1d6432f2006-01-08 13:34:22 -0800266
Matthias Kaehlckeec9ce522007-06-28 22:58:42 +0100267 mutex_lock(&priv->lock);
David Brownell1d6432f2006-01-08 13:34:22 -0800268
269 /* Continuous read, max clock = f(car) which may be less than
270 * the peak rate available. Some chips support commands with
271 * fewer "don't care" bytes. Both buffers stay unchanged.
272 */
273 command[0] = OP_READ_CONTINUOUS;
David Woodhouse271c5c52008-06-04 17:43:22 +0100274 command[1] = (uint8_t)(addr >> 16);
275 command[2] = (uint8_t)(addr >> 8);
276 command[3] = (uint8_t)(addr >> 0);
David Brownell1d6432f2006-01-08 13:34:22 -0800277 /* plus 4 "don't care" bytes */
278
279 status = spi_sync(priv->spi, &msg);
Matthias Kaehlckeec9ce522007-06-28 22:58:42 +0100280 mutex_unlock(&priv->lock);
David Brownell1d6432f2006-01-08 13:34:22 -0800281
282 if (status >= 0) {
283 *retlen = msg.actual_length - 8;
284 status = 0;
285 } else
Brian Norris289c0522011-07-19 10:06:09 -0700286 pr_debug("%s: read %x..%x --> %d\n",
Kay Sievers160bbab2008-12-23 10:00:14 +0000287 dev_name(&priv->spi->dev),
David Brownell1d6432f2006-01-08 13:34:22 -0800288 (unsigned)from, (unsigned)(from + len),
289 status);
290 return status;
291}
292
293/*
294 * Write to the DataFlash device.
295 * to : Start offset in flash device
296 * len : Amount to write
297 * retlen : Amount of data actually written
298 * buf : Buffer containing the data
299 */
300static int dataflash_write(struct mtd_info *mtd, loff_t to, size_t len,
301 size_t * retlen, const u_char * buf)
302{
Kulikov Vasiliy42845d22010-06-29 14:15:13 +0400303 struct dataflash *priv = mtd->priv;
David Brownell1d6432f2006-01-08 13:34:22 -0800304 struct spi_device *spi = priv->spi;
Mark Brown7a95db02014-10-29 12:27:32 +0000305 struct spi_transfer x[2] = { };
David Brownell1d6432f2006-01-08 13:34:22 -0800306 struct spi_message msg;
307 unsigned int pageaddr, addr, offset, writelen;
308 size_t remaining = len;
309 u_char *writebuf = (u_char *) buf;
310 int status = -EINVAL;
David Woodhouse271c5c52008-06-04 17:43:22 +0100311 uint8_t *command;
David Brownell1d6432f2006-01-08 13:34:22 -0800312
Brian Norris289c0522011-07-19 10:06:09 -0700313 pr_debug("%s: write 0x%x..0x%x\n",
Kay Sievers160bbab2008-12-23 10:00:14 +0000314 dev_name(&spi->dev), (unsigned)to, (unsigned)(to + len));
David Brownell1d6432f2006-01-08 13:34:22 -0800315
Vitaly Wool8275c642006-01-08 13:34:28 -0800316 spi_message_init(&msg);
317
David Brownell1d6432f2006-01-08 13:34:22 -0800318 x[0].tx_buf = command = priv->command;
319 x[0].len = 4;
Vitaly Wool8275c642006-01-08 13:34:28 -0800320 spi_message_add_tail(&x[0], &msg);
David Brownell1d6432f2006-01-08 13:34:22 -0800321
322 pageaddr = ((unsigned)to / priv->page_size);
323 offset = ((unsigned)to % priv->page_size);
324 if (offset + len > priv->page_size)
325 writelen = priv->page_size - offset;
326 else
327 writelen = len;
328
Matthias Kaehlckeec9ce522007-06-28 22:58:42 +0100329 mutex_lock(&priv->lock);
David Brownell1d6432f2006-01-08 13:34:22 -0800330 while (remaining > 0) {
Brian Norris289c0522011-07-19 10:06:09 -0700331 pr_debug("write @ %i:%i len=%i\n",
David Brownell1d6432f2006-01-08 13:34:22 -0800332 pageaddr, offset, writelen);
333
334 /* REVISIT:
335 * (a) each page in a sector must be rewritten at least
336 * once every 10K sibling erase/program operations.
337 * (b) for pages that are already erased, we could
338 * use WRITE+MWRITE not PROGRAM for ~30% speedup.
339 * (c) WRITE to buffer could be done while waiting for
340 * a previous MWRITE/MWERASE to complete ...
341 * (d) error handling here seems to be mostly missing.
342 *
343 * Two persistent bits per page, plus a per-sector counter,
344 * could support (a) and (b) ... we might consider using
345 * the second half of sector zero, which is just one block,
346 * to track that state. (On AT91, that sector should also
347 * support boot-from-DataFlash.)
348 */
349
350 addr = pageaddr << priv->page_offset;
351
352 /* (1) Maybe transfer partial page to Buffer1 */
353 if (writelen != priv->page_size) {
354 command[0] = OP_TRANSFER_BUF1;
355 command[1] = (addr & 0x00FF0000) >> 16;
356 command[2] = (addr & 0x0000FF00) >> 8;
357 command[3] = 0;
358
Brian Norris289c0522011-07-19 10:06:09 -0700359 pr_debug("TRANSFER: (%x) %x %x %x\n",
David Brownell1d6432f2006-01-08 13:34:22 -0800360 command[0], command[1], command[2], command[3]);
361
David Brownell1d6432f2006-01-08 13:34:22 -0800362 status = spi_sync(spi, &msg);
363 if (status < 0)
Brian Norris0a32a102011-07-19 10:06:10 -0700364 pr_debug("%s: xfer %u -> %d\n",
Kay Sievers160bbab2008-12-23 10:00:14 +0000365 dev_name(&spi->dev), addr, status);
David Brownell1d6432f2006-01-08 13:34:22 -0800366
367 (void) dataflash_waitready(priv->spi);
368 }
369
370 /* (2) Program full page via Buffer1 */
371 addr += offset;
372 command[0] = OP_PROGRAM_VIA_BUF1;
373 command[1] = (addr & 0x00FF0000) >> 16;
374 command[2] = (addr & 0x0000FF00) >> 8;
375 command[3] = (addr & 0x000000FF);
376
Brian Norris289c0522011-07-19 10:06:09 -0700377 pr_debug("PROGRAM: (%x) %x %x %x\n",
David Brownell1d6432f2006-01-08 13:34:22 -0800378 command[0], command[1], command[2], command[3]);
379
380 x[1].tx_buf = writebuf;
381 x[1].len = writelen;
Vitaly Wool8275c642006-01-08 13:34:28 -0800382 spi_message_add_tail(x + 1, &msg);
David Brownell1d6432f2006-01-08 13:34:22 -0800383 status = spi_sync(spi, &msg);
Vitaly Wool8275c642006-01-08 13:34:28 -0800384 spi_transfer_del(x + 1);
David Brownell1d6432f2006-01-08 13:34:22 -0800385 if (status < 0)
Brian Norris0a32a102011-07-19 10:06:10 -0700386 pr_debug("%s: pgm %u/%u -> %d\n",
Kay Sievers160bbab2008-12-23 10:00:14 +0000387 dev_name(&spi->dev), addr, writelen, status);
David Brownell1d6432f2006-01-08 13:34:22 -0800388
389 (void) dataflash_waitready(priv->spi);
390
Vitaly Wool8275c642006-01-08 13:34:28 -0800391
Robert P. J. Day05dd1802009-07-19 21:19:08 -0400392#ifdef CONFIG_MTD_DATAFLASH_WRITE_VERIFY
David Brownell1d6432f2006-01-08 13:34:22 -0800393
394 /* (3) Compare to Buffer1 */
395 addr = pageaddr << priv->page_offset;
396 command[0] = OP_COMPARE_BUF1;
397 command[1] = (addr & 0x00FF0000) >> 16;
398 command[2] = (addr & 0x0000FF00) >> 8;
399 command[3] = 0;
400
Brian Norris289c0522011-07-19 10:06:09 -0700401 pr_debug("COMPARE: (%x) %x %x %x\n",
David Brownell1d6432f2006-01-08 13:34:22 -0800402 command[0], command[1], command[2], command[3]);
403
David Brownell1d6432f2006-01-08 13:34:22 -0800404 status = spi_sync(spi, &msg);
405 if (status < 0)
Brian Norris0a32a102011-07-19 10:06:10 -0700406 pr_debug("%s: compare %u -> %d\n",
Kay Sievers160bbab2008-12-23 10:00:14 +0000407 dev_name(&spi->dev), addr, status);
David Brownell1d6432f2006-01-08 13:34:22 -0800408
409 status = dataflash_waitready(priv->spi);
410
411 /* Check result of the compare operation */
Andrew Victorcccb45d2007-11-19 15:37:23 +0200412 if (status & (1 << 6)) {
David Brownell1d6432f2006-01-08 13:34:22 -0800413 printk(KERN_ERR "%s: compare page %u, err %d\n",
Kay Sievers160bbab2008-12-23 10:00:14 +0000414 dev_name(&spi->dev), pageaddr, status);
David Brownell1d6432f2006-01-08 13:34:22 -0800415 remaining = 0;
416 status = -EIO;
417 break;
418 } else
419 status = 0;
420
Robert P. J. Day05dd1802009-07-19 21:19:08 -0400421#endif /* CONFIG_MTD_DATAFLASH_WRITE_VERIFY */
David Brownell1d6432f2006-01-08 13:34:22 -0800422
423 remaining = remaining - writelen;
424 pageaddr++;
425 offset = 0;
426 writebuf += writelen;
427 *retlen += writelen;
428
429 if (remaining > priv->page_size)
430 writelen = priv->page_size;
431 else
432 writelen = remaining;
433 }
Matthias Kaehlckeec9ce522007-06-28 22:58:42 +0100434 mutex_unlock(&priv->lock);
David Brownell1d6432f2006-01-08 13:34:22 -0800435
436 return status;
437}
438
439/* ......................................................................... */
440
David Brownell34a82442008-07-30 12:35:05 -0700441#ifdef CONFIG_MTD_DATAFLASH_OTP
442
Christian Riesch4b78fc42014-01-28 09:29:44 +0100443static int dataflash_get_otp_info(struct mtd_info *mtd, size_t len,
444 size_t *retlen, struct otp_info *info)
David Brownell34a82442008-07-30 12:35:05 -0700445{
446 /* Report both blocks as identical: bytes 0..64, locked.
447 * Unless the user block changed from all-ones, we can't
448 * tell whether it's still writable; so we assume it isn't.
449 */
450 info->start = 0;
451 info->length = 64;
452 info->locked = 1;
Christian Riesch4b78fc42014-01-28 09:29:44 +0100453 *retlen = sizeof(*info);
454 return 0;
David Brownell34a82442008-07-30 12:35:05 -0700455}
456
457static ssize_t otp_read(struct spi_device *spi, unsigned base,
458 uint8_t *buf, loff_t off, size_t len)
459{
460 struct spi_message m;
461 size_t l;
462 uint8_t *scratch;
463 struct spi_transfer t;
464 int status;
465
466 if (off > 64)
467 return -EINVAL;
468
469 if ((off + len) > 64)
470 len = 64 - off;
David Brownell34a82442008-07-30 12:35:05 -0700471
472 spi_message_init(&m);
473
474 l = 4 + base + off + len;
475 scratch = kzalloc(l, GFP_KERNEL);
476 if (!scratch)
477 return -ENOMEM;
478
479 /* OUT: OP_READ_SECURITY, 3 don't-care bytes, zeroes
480 * IN: ignore 4 bytes, data bytes 0..N (max 127)
481 */
482 scratch[0] = OP_READ_SECURITY;
483
484 memset(&t, 0, sizeof t);
485 t.tx_buf = scratch;
486 t.rx_buf = scratch;
487 t.len = l;
488 spi_message_add_tail(&t, &m);
489
490 dataflash_waitready(spi);
491
492 status = spi_sync(spi, &m);
493 if (status >= 0) {
494 memcpy(buf, scratch + 4 + base + off, len);
495 status = len;
496 }
497
498 kfree(scratch);
499 return status;
500}
501
502static int dataflash_read_fact_otp(struct mtd_info *mtd,
503 loff_t from, size_t len, size_t *retlen, u_char *buf)
504{
Kulikov Vasiliy42845d22010-06-29 14:15:13 +0400505 struct dataflash *priv = mtd->priv;
David Brownell34a82442008-07-30 12:35:05 -0700506 int status;
507
508 /* 64 bytes, from 0..63 ... start at 64 on-chip */
509 mutex_lock(&priv->lock);
510 status = otp_read(priv->spi, 64, buf, from, len);
511 mutex_unlock(&priv->lock);
512
513 if (status < 0)
514 return status;
515 *retlen = status;
516 return 0;
517}
518
519static int dataflash_read_user_otp(struct mtd_info *mtd,
520 loff_t from, size_t len, size_t *retlen, u_char *buf)
521{
Kulikov Vasiliy42845d22010-06-29 14:15:13 +0400522 struct dataflash *priv = mtd->priv;
David Brownell34a82442008-07-30 12:35:05 -0700523 int status;
524
525 /* 64 bytes, from 0..63 ... start at 0 on-chip */
526 mutex_lock(&priv->lock);
527 status = otp_read(priv->spi, 0, buf, from, len);
528 mutex_unlock(&priv->lock);
529
530 if (status < 0)
531 return status;
532 *retlen = status;
533 return 0;
534}
535
536static int dataflash_write_user_otp(struct mtd_info *mtd,
537 loff_t from, size_t len, size_t *retlen, u_char *buf)
538{
539 struct spi_message m;
540 const size_t l = 4 + 64;
541 uint8_t *scratch;
542 struct spi_transfer t;
Kulikov Vasiliy42845d22010-06-29 14:15:13 +0400543 struct dataflash *priv = mtd->priv;
David Brownell34a82442008-07-30 12:35:05 -0700544 int status;
545
Christian Riesch9a78bc82014-03-06 12:42:37 +0100546 if (from >= 64) {
547 /*
548 * Attempting to write beyond the end of OTP memory,
549 * no data can be written.
550 */
551 *retlen = 0;
552 return 0;
553 }
David Brownell34a82442008-07-30 12:35:05 -0700554
Christian Riesch9a78bc82014-03-06 12:42:37 +0100555 /* Truncate the write to fit into OTP memory. */
David Brownell34a82442008-07-30 12:35:05 -0700556 if ((from + len) > 64)
Christian Riesch9a78bc82014-03-06 12:42:37 +0100557 len = 64 - from;
David Brownell34a82442008-07-30 12:35:05 -0700558
559 /* OUT: OP_WRITE_SECURITY, 3 zeroes, 64 data-or-zero bytes
560 * IN: ignore all
561 */
562 scratch = kzalloc(l, GFP_KERNEL);
563 if (!scratch)
564 return -ENOMEM;
565 scratch[0] = OP_WRITE_SECURITY;
566 memcpy(scratch + 4 + from, buf, len);
567
568 spi_message_init(&m);
569
570 memset(&t, 0, sizeof t);
571 t.tx_buf = scratch;
572 t.len = l;
573 spi_message_add_tail(&t, &m);
574
575 /* Write the OTP bits, if they've not yet been written.
576 * This modifies SRAM buffer1.
577 */
578 mutex_lock(&priv->lock);
579 dataflash_waitready(priv->spi);
580 status = spi_sync(priv->spi, &m);
581 mutex_unlock(&priv->lock);
582
583 kfree(scratch);
584
585 if (status >= 0) {
586 status = 0;
587 *retlen = len;
588 }
589 return status;
590}
591
592static char *otp_setup(struct mtd_info *device, char revision)
593{
Artem Bityutskiy3c3c10b2012-01-30 14:58:32 +0200594 device->_get_fact_prot_info = dataflash_get_otp_info;
595 device->_read_fact_prot_reg = dataflash_read_fact_otp;
596 device->_get_user_prot_info = dataflash_get_otp_info;
597 device->_read_user_prot_reg = dataflash_read_user_otp;
David Brownell34a82442008-07-30 12:35:05 -0700598
599 /* rev c parts (at45db321c and at45db1281 only!) use a
600 * different write procedure; not (yet?) implemented.
601 */
602 if (revision > 'c')
Artem Bityutskiy3c3c10b2012-01-30 14:58:32 +0200603 device->_write_user_prot_reg = dataflash_write_user_otp;
David Brownell34a82442008-07-30 12:35:05 -0700604
605 return ", OTP";
606}
607
608#else
609
David Brownellcf93ae02008-08-06 13:12:04 -0700610static char *otp_setup(struct mtd_info *device, char revision)
David Brownell34a82442008-07-30 12:35:05 -0700611{
612 return " (OTP)";
613}
614
615#endif
616
617/* ......................................................................... */
618
David Brownell1d6432f2006-01-08 13:34:22 -0800619/*
620 * Register DataFlash device with MTD subsystem.
621 */
Greg Kroah-Hartmand8929942012-12-21 13:19:05 -0800622static int add_dataflash_otp(struct spi_device *spi, char *name, int nr_pages,
623 int pagesize, int pageoffset, char revision)
David Brownell1d6432f2006-01-08 13:34:22 -0800624{
625 struct dataflash *priv;
626 struct mtd_info *device;
Jingoo Han0278fd32013-07-30 17:17:44 +0900627 struct flash_platform_data *pdata = dev_get_platdata(&spi->dev);
David Brownell34a82442008-07-30 12:35:05 -0700628 char *otp_tag = "";
H Hartley Sweetend4702662009-10-07 17:08:08 -0400629 int err = 0;
David Brownell1d6432f2006-01-08 13:34:22 -0800630
Robert P. J. Day5cbded52006-12-13 00:35:56 -0800631 priv = kzalloc(sizeof *priv, GFP_KERNEL);
David Brownell1d6432f2006-01-08 13:34:22 -0800632 if (!priv)
633 return -ENOMEM;
634
Matthias Kaehlckeec9ce522007-06-28 22:58:42 +0100635 mutex_init(&priv->lock);
David Brownell1d6432f2006-01-08 13:34:22 -0800636 priv->spi = spi;
637 priv->page_size = pagesize;
638 priv->page_offset = pageoffset;
639
640 /* name must be usable with cmdlinepart */
641 sprintf(priv->name, "spi%d.%d-%s",
642 spi->master->bus_num, spi->chip_select,
643 name);
644
645 device = &priv->mtd;
646 device->name = (pdata && pdata->name) ? pdata->name : priv->name;
647 device->size = nr_pages * pagesize;
648 device->erasesize = pagesize;
Artem B. Bityutskiy17ffc7b2006-06-22 18:15:48 +0400649 device->writesize = pagesize;
David Brownell1d6432f2006-01-08 13:34:22 -0800650 device->type = MTD_DATAFLASH;
Haavard Skinnemoen6c33caf2006-11-29 14:26:07 +0100651 device->flags = MTD_WRITEABLE;
Artem Bityutskiy3c3c10b2012-01-30 14:58:32 +0200652 device->_erase = dataflash_erase;
653 device->_read = dataflash_read;
654 device->_write = dataflash_write;
David Brownell1d6432f2006-01-08 13:34:22 -0800655 device->priv = priv;
656
David Brownell87f39f02009-03-26 00:42:50 -0700657 device->dev.parent = &spi->dev;
Brian Norris004b5e62015-10-30 20:33:28 -0700658 mtd_set_of_node(device, spi->dev.of_node);
David Brownell87f39f02009-03-26 00:42:50 -0700659
David Brownell34a82442008-07-30 12:35:05 -0700660 if (revision >= 'c')
661 otp_tag = otp_setup(device, revision);
662
Artem Bityutskiy5b7f3a52008-12-18 14:09:56 +0200663 dev_info(&spi->dev, "%s (%lld KBytes) pagesize %d bytes%s\n",
664 name, (long long)((device->size + 1023) >> 10),
David Brownell34a82442008-07-30 12:35:05 -0700665 pagesize, otp_tag);
Jingoo Han5cacbfa2013-04-06 15:41:03 +0900666 spi_set_drvdata(spi, priv);
David Brownell1d6432f2006-01-08 13:34:22 -0800667
Brian Norris004b5e62015-10-30 20:33:28 -0700668 err = mtd_device_register(device,
Dmitry Eremin-Solenikov3a8fb122011-06-02 17:59:18 +0400669 pdata ? pdata->parts : NULL,
670 pdata ? pdata->nr_parts : 0);
David Brownell1d6432f2006-01-08 13:34:22 -0800671
H Hartley Sweetend4702662009-10-07 17:08:08 -0400672 if (!err)
673 return 0;
674
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:
Mark Browncb85b7e2013-10-16 13:16:14 +0100884 dev_info(&spi->dev, "unsupported device (%x)\n",
Brian Norris0a32a102011-07-19 10:06:10 -0700885 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);
Jingoo Han1ba80c92013-11-25 12:24:22 +0900904 if (status == 0)
David Brownell1d6432f2006-01-08 13:34:22 -0800905 kfree(flash);
906 return status;
907}
908
909static struct spi_driver dataflash_driver = {
910 .driver = {
911 .name = "mtd_dataflash",
Sachin Kamat19d69b82013-03-14 15:37:00 +0530912 .of_match_table = of_match_ptr(dataflash_dt_ids),
David Brownell1d6432f2006-01-08 13:34:22 -0800913 },
914
915 .probe = dataflash_probe,
Bill Pemberton5153b882012-11-19 13:21:24 -0500916 .remove = dataflash_remove,
David Brownell1d6432f2006-01-08 13:34:22 -0800917
918 /* FIXME: investigate suspend and resume... */
919};
920
Axel Linc9d1b752012-01-27 15:45:20 +0800921module_spi_driver(dataflash_driver);
David Brownell1d6432f2006-01-08 13:34:22 -0800922
923MODULE_LICENSE("GPL");
924MODULE_AUTHOR("Andrew Victor, David Brownell");
925MODULE_DESCRIPTION("MTD DataFlash driver");
Anton Vorontsove0626e32009-09-22 16:46:08 -0700926MODULE_ALIAS("spi:mtd_dataflash");