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1d6432fe DB |
1 | /* |
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 | */ | |
1d6432fe DB |
12 | #include <linux/module.h> |
13 | #include <linux/init.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/delay.h> | |
16 | #include <linux/device.h> | |
ec9ce52e | 17 | #include <linux/mutex.h> |
771999b6 | 18 | #include <linux/err.h> |
5b7f3a50 | 19 | #include <linux/math64.h> |
771999b6 | 20 | |
1d6432fe DB |
21 | #include <linux/spi/spi.h> |
22 | #include <linux/spi/flash.h> | |
23 | ||
24 | #include <linux/mtd/mtd.h> | |
25 | #include <linux/mtd/partitions.h> | |
26 | ||
27 | ||
28 | /* | |
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 | |
8c64038e | 34 | * MMC stack can't (yet?) distinguish between MMC and DataFlash |
1d6432fe DB |
35 | * protocols during enumeration. |
36 | */ | |
37 | ||
1d6432fe DB |
38 | /* 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 | |
34a82443 DB |
82 | #define OP_WRITE_SECURITY_REVC 0x9A |
83 | #define OP_WRITE_SECURITY 0x9B /* revision D */ | |
1d6432fe DB |
84 | |
85 | ||
86 | struct dataflash { | |
271c5c59 | 87 | uint8_t command[4]; |
1d6432fe DB |
88 | char name[24]; |
89 | ||
90 | unsigned partitioned:1; | |
91 | ||
92 | unsigned short page_offset; /* offset in flash address */ | |
93 | unsigned int page_size; /* of bytes per page */ | |
94 | ||
ec9ce52e | 95 | struct mutex lock; |
1d6432fe DB |
96 | struct spi_device *spi; |
97 | ||
98 | struct mtd_info mtd; | |
99 | }; | |
100 | ||
101 | #ifdef CONFIG_MTD_PARTITIONS | |
102 | #define mtd_has_partitions() (1) | |
103 | #else | |
104 | #define mtd_has_partitions() (0) | |
105 | #endif | |
106 | ||
107 | /* ......................................................................... */ | |
108 | ||
109 | /* | |
110 | * Return the status of the DataFlash device. | |
111 | */ | |
112 | static inline int dataflash_status(struct spi_device *spi) | |
113 | { | |
114 | /* NOTE: at45db321c over 25 MHz wants to write | |
115 | * a dummy byte after the opcode... | |
116 | */ | |
117 | return spi_w8r8(spi, OP_READ_STATUS); | |
118 | } | |
119 | ||
120 | /* | |
121 | * Poll the DataFlash device until it is READY. | |
122 | * This usually takes 5-20 msec or so; more for sector erase. | |
123 | */ | |
124 | static int dataflash_waitready(struct spi_device *spi) | |
125 | { | |
126 | int status; | |
127 | ||
128 | for (;;) { | |
129 | status = dataflash_status(spi); | |
130 | if (status < 0) { | |
131 | DEBUG(MTD_DEBUG_LEVEL1, "%s: status %d?\n", | |
160bbab3 | 132 | dev_name(&spi->dev), status); |
1d6432fe DB |
133 | status = 0; |
134 | } | |
135 | ||
136 | if (status & (1 << 7)) /* RDY/nBSY */ | |
137 | return status; | |
138 | ||
139 | msleep(3); | |
140 | } | |
141 | } | |
142 | ||
143 | /* ......................................................................... */ | |
144 | ||
145 | /* | |
146 | * Erase pages of flash. | |
147 | */ | |
148 | static int dataflash_erase(struct mtd_info *mtd, struct erase_info *instr) | |
149 | { | |
150 | struct dataflash *priv = (struct dataflash *)mtd->priv; | |
151 | struct spi_device *spi = priv->spi; | |
8275c642 | 152 | struct spi_transfer x = { .tx_dma = 0, }; |
1d6432fe DB |
153 | struct spi_message msg; |
154 | unsigned blocksize = priv->page_size << 3; | |
271c5c59 | 155 | uint8_t *command; |
5b7f3a50 | 156 | uint32_t rem; |
1d6432fe | 157 | |
5b7f3a50 | 158 | DEBUG(MTD_DEBUG_LEVEL2, "%s: erase addr=0x%llx len 0x%llx\n", |
160bbab3 KS |
159 | dev_name(&spi->dev), (long long)instr->addr, |
160 | (long long)instr->len); | |
1d6432fe DB |
161 | |
162 | /* Sanity checks */ | |
5b7f3a50 AB |
163 | if (instr->addr + instr->len > mtd->size) |
164 | return -EINVAL; | |
165 | 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) | |
1d6432fe DB |
170 | return -EINVAL; |
171 | ||
8275c642 VW |
172 | spi_message_init(&msg); |
173 | ||
174 | x.tx_buf = command = priv->command; | |
175 | x.len = 4; | |
176 | spi_message_add_tail(&x, &msg); | |
1d6432fe | 177 | |
ec9ce52e | 178 | mutex_lock(&priv->lock); |
1d6432fe DB |
179 | 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 | */ | |
5b7f3a50 | 187 | pageaddr = div_u64(instr->len, priv->page_size); |
3cb4f09f | 188 | do_block = (pageaddr & 0x7) == 0 && instr->len >= blocksize; |
1d6432fe DB |
189 | pageaddr = pageaddr << priv->page_offset; |
190 | ||
191 | command[0] = do_block ? OP_ERASE_BLOCK : OP_ERASE_PAGE; | |
271c5c59 DW |
192 | command[1] = (uint8_t)(pageaddr >> 16); |
193 | command[2] = (uint8_t)(pageaddr >> 8); | |
1d6432fe DB |
194 | command[3] = 0; |
195 | ||
196 | DEBUG(MTD_DEBUG_LEVEL3, "ERASE %s: (%x) %x %x %x [%i]\n", | |
197 | 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", | |
160bbab3 | 206 | dev_name(&spi->dev), pageaddr, status); |
1d6432fe DB |
207 | /* 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 | } | |
ec9ce52e | 221 | mutex_unlock(&priv->lock); |
1d6432fe DB |
222 | |
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 | */ | |
237 | static int dataflash_read(struct mtd_info *mtd, loff_t from, size_t len, | |
238 | size_t *retlen, u_char *buf) | |
239 | { | |
240 | struct dataflash *priv = (struct dataflash *)mtd->priv; | |
241 | struct spi_transfer x[2] = { { .tx_dma = 0, }, }; | |
242 | struct spi_message msg; | |
243 | unsigned int addr; | |
271c5c59 | 244 | uint8_t *command; |
1d6432fe DB |
245 | int status; |
246 | ||
247 | DEBUG(MTD_DEBUG_LEVEL2, "%s: read 0x%x..0x%x\n", | |
160bbab3 | 248 | dev_name(&priv->spi->dev), (unsigned)from, (unsigned)(from + len)); |
1d6432fe DB |
249 | |
250 | *retlen = 0; | |
251 | ||
252 | /* Sanity checks */ | |
253 | if (!len) | |
254 | return 0; | |
255 | if (from + len > mtd->size) | |
256 | return -EINVAL; | |
257 | ||
258 | /* Calculate flash page/byte address */ | |
259 | addr = (((unsigned)from / priv->page_size) << priv->page_offset) | |
260 | + ((unsigned)from % priv->page_size); | |
261 | ||
262 | command = priv->command; | |
263 | ||
264 | DEBUG(MTD_DEBUG_LEVEL3, "READ: (%x) %x %x %x\n", | |
265 | command[0], command[1], command[2], command[3]); | |
266 | ||
8275c642 VW |
267 | spi_message_init(&msg); |
268 | ||
1d6432fe DB |
269 | x[0].tx_buf = command; |
270 | x[0].len = 8; | |
8275c642 VW |
271 | spi_message_add_tail(&x[0], &msg); |
272 | ||
1d6432fe DB |
273 | x[1].rx_buf = buf; |
274 | x[1].len = len; | |
8275c642 | 275 | spi_message_add_tail(&x[1], &msg); |
1d6432fe | 276 | |
ec9ce52e | 277 | mutex_lock(&priv->lock); |
1d6432fe DB |
278 | |
279 | /* Continuous read, max clock = f(car) which may be less than | |
280 | * the peak rate available. Some chips support commands with | |
281 | * fewer "don't care" bytes. Both buffers stay unchanged. | |
282 | */ | |
283 | command[0] = OP_READ_CONTINUOUS; | |
271c5c59 DW |
284 | command[1] = (uint8_t)(addr >> 16); |
285 | command[2] = (uint8_t)(addr >> 8); | |
286 | command[3] = (uint8_t)(addr >> 0); | |
1d6432fe DB |
287 | /* plus 4 "don't care" bytes */ |
288 | ||
289 | status = spi_sync(priv->spi, &msg); | |
ec9ce52e | 290 | mutex_unlock(&priv->lock); |
1d6432fe DB |
291 | |
292 | if (status >= 0) { | |
293 | *retlen = msg.actual_length - 8; | |
294 | status = 0; | |
295 | } else | |
296 | DEBUG(MTD_DEBUG_LEVEL1, "%s: read %x..%x --> %d\n", | |
160bbab3 | 297 | dev_name(&priv->spi->dev), |
1d6432fe DB |
298 | (unsigned)from, (unsigned)(from + len), |
299 | status); | |
300 | return status; | |
301 | } | |
302 | ||
303 | /* | |
304 | * Write to the DataFlash device. | |
305 | * to : Start offset in flash device | |
306 | * len : Amount to write | |
307 | * retlen : Amount of data actually written | |
308 | * buf : Buffer containing the data | |
309 | */ | |
310 | static int dataflash_write(struct mtd_info *mtd, loff_t to, size_t len, | |
311 | size_t * retlen, const u_char * buf) | |
312 | { | |
313 | struct dataflash *priv = (struct dataflash *)mtd->priv; | |
314 | struct spi_device *spi = priv->spi; | |
315 | struct spi_transfer x[2] = { { .tx_dma = 0, }, }; | |
316 | struct spi_message msg; | |
317 | unsigned int pageaddr, addr, offset, writelen; | |
318 | size_t remaining = len; | |
319 | u_char *writebuf = (u_char *) buf; | |
320 | int status = -EINVAL; | |
271c5c59 | 321 | uint8_t *command; |
1d6432fe DB |
322 | |
323 | DEBUG(MTD_DEBUG_LEVEL2, "%s: write 0x%x..0x%x\n", | |
160bbab3 | 324 | dev_name(&spi->dev), (unsigned)to, (unsigned)(to + len)); |
1d6432fe DB |
325 | |
326 | *retlen = 0; | |
327 | ||
328 | /* Sanity checks */ | |
329 | if (!len) | |
330 | return 0; | |
331 | if ((to + len) > mtd->size) | |
332 | return -EINVAL; | |
333 | ||
8275c642 VW |
334 | spi_message_init(&msg); |
335 | ||
1d6432fe DB |
336 | x[0].tx_buf = command = priv->command; |
337 | x[0].len = 4; | |
8275c642 | 338 | spi_message_add_tail(&x[0], &msg); |
1d6432fe DB |
339 | |
340 | pageaddr = ((unsigned)to / priv->page_size); | |
341 | offset = ((unsigned)to % priv->page_size); | |
342 | if (offset + len > priv->page_size) | |
343 | writelen = priv->page_size - offset; | |
344 | else | |
345 | writelen = len; | |
346 | ||
ec9ce52e | 347 | mutex_lock(&priv->lock); |
1d6432fe DB |
348 | while (remaining > 0) { |
349 | DEBUG(MTD_DEBUG_LEVEL3, "write @ %i:%i len=%i\n", | |
350 | pageaddr, offset, writelen); | |
351 | ||
352 | /* REVISIT: | |
353 | * (a) each page in a sector must be rewritten at least | |
354 | * once every 10K sibling erase/program operations. | |
355 | * (b) for pages that are already erased, we could | |
356 | * use WRITE+MWRITE not PROGRAM for ~30% speedup. | |
357 | * (c) WRITE to buffer could be done while waiting for | |
358 | * a previous MWRITE/MWERASE to complete ... | |
359 | * (d) error handling here seems to be mostly missing. | |
360 | * | |
361 | * Two persistent bits per page, plus a per-sector counter, | |
362 | * could support (a) and (b) ... we might consider using | |
363 | * the second half of sector zero, which is just one block, | |
364 | * to track that state. (On AT91, that sector should also | |
365 | * support boot-from-DataFlash.) | |
366 | */ | |
367 | ||
368 | addr = pageaddr << priv->page_offset; | |
369 | ||
370 | /* (1) Maybe transfer partial page to Buffer1 */ | |
371 | if (writelen != priv->page_size) { | |
372 | command[0] = OP_TRANSFER_BUF1; | |
373 | command[1] = (addr & 0x00FF0000) >> 16; | |
374 | command[2] = (addr & 0x0000FF00) >> 8; | |
375 | command[3] = 0; | |
376 | ||
377 | DEBUG(MTD_DEBUG_LEVEL3, "TRANSFER: (%x) %x %x %x\n", | |
378 | command[0], command[1], command[2], command[3]); | |
379 | ||
1d6432fe DB |
380 | status = spi_sync(spi, &msg); |
381 | if (status < 0) | |
382 | DEBUG(MTD_DEBUG_LEVEL1, "%s: xfer %u -> %d \n", | |
160bbab3 | 383 | dev_name(&spi->dev), addr, status); |
1d6432fe DB |
384 | |
385 | (void) dataflash_waitready(priv->spi); | |
386 | } | |
387 | ||
388 | /* (2) Program full page via Buffer1 */ | |
389 | addr += offset; | |
390 | command[0] = OP_PROGRAM_VIA_BUF1; | |
391 | command[1] = (addr & 0x00FF0000) >> 16; | |
392 | command[2] = (addr & 0x0000FF00) >> 8; | |
393 | command[3] = (addr & 0x000000FF); | |
394 | ||
395 | DEBUG(MTD_DEBUG_LEVEL3, "PROGRAM: (%x) %x %x %x\n", | |
396 | command[0], command[1], command[2], command[3]); | |
397 | ||
398 | x[1].tx_buf = writebuf; | |
399 | x[1].len = writelen; | |
8275c642 | 400 | spi_message_add_tail(x + 1, &msg); |
1d6432fe | 401 | status = spi_sync(spi, &msg); |
8275c642 | 402 | spi_transfer_del(x + 1); |
1d6432fe DB |
403 | if (status < 0) |
404 | DEBUG(MTD_DEBUG_LEVEL1, "%s: pgm %u/%u -> %d \n", | |
160bbab3 | 405 | dev_name(&spi->dev), addr, writelen, status); |
1d6432fe DB |
406 | |
407 | (void) dataflash_waitready(priv->spi); | |
408 | ||
8275c642 | 409 | |
8c64038e | 410 | #ifdef CONFIG_MTD_DATAFLASH_VERIFY_WRITE |
1d6432fe DB |
411 | |
412 | /* (3) Compare to Buffer1 */ | |
413 | addr = pageaddr << priv->page_offset; | |
414 | command[0] = OP_COMPARE_BUF1; | |
415 | command[1] = (addr & 0x00FF0000) >> 16; | |
416 | command[2] = (addr & 0x0000FF00) >> 8; | |
417 | command[3] = 0; | |
418 | ||
419 | DEBUG(MTD_DEBUG_LEVEL3, "COMPARE: (%x) %x %x %x\n", | |
420 | command[0], command[1], command[2], command[3]); | |
421 | ||
1d6432fe DB |
422 | status = spi_sync(spi, &msg); |
423 | if (status < 0) | |
424 | DEBUG(MTD_DEBUG_LEVEL1, "%s: compare %u -> %d \n", | |
160bbab3 | 425 | dev_name(&spi->dev), addr, status); |
1d6432fe DB |
426 | |
427 | status = dataflash_waitready(priv->spi); | |
428 | ||
429 | /* Check result of the compare operation */ | |
cccb45d4 | 430 | if (status & (1 << 6)) { |
1d6432fe | 431 | printk(KERN_ERR "%s: compare page %u, err %d\n", |
160bbab3 | 432 | dev_name(&spi->dev), pageaddr, status); |
1d6432fe DB |
433 | remaining = 0; |
434 | status = -EIO; | |
435 | break; | |
436 | } else | |
437 | status = 0; | |
438 | ||
8c64038e | 439 | #endif /* CONFIG_MTD_DATAFLASH_VERIFY_WRITE */ |
1d6432fe DB |
440 | |
441 | remaining = remaining - writelen; | |
442 | pageaddr++; | |
443 | offset = 0; | |
444 | writebuf += writelen; | |
445 | *retlen += writelen; | |
446 | ||
447 | if (remaining > priv->page_size) | |
448 | writelen = priv->page_size; | |
449 | else | |
450 | writelen = remaining; | |
451 | } | |
ec9ce52e | 452 | mutex_unlock(&priv->lock); |
1d6432fe DB |
453 | |
454 | return status; | |
455 | } | |
456 | ||
457 | /* ......................................................................... */ | |
458 | ||
34a82443 DB |
459 | #ifdef CONFIG_MTD_DATAFLASH_OTP |
460 | ||
461 | static int dataflash_get_otp_info(struct mtd_info *mtd, | |
462 | struct otp_info *info, size_t len) | |
463 | { | |
464 | /* Report both blocks as identical: bytes 0..64, locked. | |
465 | * Unless the user block changed from all-ones, we can't | |
466 | * tell whether it's still writable; so we assume it isn't. | |
467 | */ | |
468 | info->start = 0; | |
469 | info->length = 64; | |
470 | info->locked = 1; | |
471 | return sizeof(*info); | |
472 | } | |
473 | ||
474 | static ssize_t otp_read(struct spi_device *spi, unsigned base, | |
475 | uint8_t *buf, loff_t off, size_t len) | |
476 | { | |
477 | struct spi_message m; | |
478 | size_t l; | |
479 | uint8_t *scratch; | |
480 | struct spi_transfer t; | |
481 | int status; | |
482 | ||
483 | if (off > 64) | |
484 | return -EINVAL; | |
485 | ||
486 | if ((off + len) > 64) | |
487 | len = 64 - off; | |
488 | if (len == 0) | |
489 | return len; | |
490 | ||
491 | spi_message_init(&m); | |
492 | ||
493 | l = 4 + base + off + len; | |
494 | scratch = kzalloc(l, GFP_KERNEL); | |
495 | if (!scratch) | |
496 | return -ENOMEM; | |
497 | ||
498 | /* OUT: OP_READ_SECURITY, 3 don't-care bytes, zeroes | |
499 | * IN: ignore 4 bytes, data bytes 0..N (max 127) | |
500 | */ | |
501 | scratch[0] = OP_READ_SECURITY; | |
502 | ||
503 | memset(&t, 0, sizeof t); | |
504 | t.tx_buf = scratch; | |
505 | t.rx_buf = scratch; | |
506 | t.len = l; | |
507 | spi_message_add_tail(&t, &m); | |
508 | ||
509 | dataflash_waitready(spi); | |
510 | ||
511 | status = spi_sync(spi, &m); | |
512 | if (status >= 0) { | |
513 | memcpy(buf, scratch + 4 + base + off, len); | |
514 | status = len; | |
515 | } | |
516 | ||
517 | kfree(scratch); | |
518 | return status; | |
519 | } | |
520 | ||
521 | static int dataflash_read_fact_otp(struct mtd_info *mtd, | |
522 | loff_t from, size_t len, size_t *retlen, u_char *buf) | |
523 | { | |
524 | struct dataflash *priv = (struct dataflash *)mtd->priv; | |
525 | int status; | |
526 | ||
527 | /* 64 bytes, from 0..63 ... start at 64 on-chip */ | |
528 | mutex_lock(&priv->lock); | |
529 | status = otp_read(priv->spi, 64, buf, from, len); | |
530 | mutex_unlock(&priv->lock); | |
531 | ||
532 | if (status < 0) | |
533 | return status; | |
534 | *retlen = status; | |
535 | return 0; | |
536 | } | |
537 | ||
538 | static int dataflash_read_user_otp(struct mtd_info *mtd, | |
539 | loff_t from, size_t len, size_t *retlen, u_char *buf) | |
540 | { | |
541 | struct dataflash *priv = (struct dataflash *)mtd->priv; | |
542 | int status; | |
543 | ||
544 | /* 64 bytes, from 0..63 ... start at 0 on-chip */ | |
545 | mutex_lock(&priv->lock); | |
546 | status = otp_read(priv->spi, 0, buf, from, len); | |
547 | mutex_unlock(&priv->lock); | |
548 | ||
549 | if (status < 0) | |
550 | return status; | |
551 | *retlen = status; | |
552 | return 0; | |
553 | } | |
554 | ||
555 | static int dataflash_write_user_otp(struct mtd_info *mtd, | |
556 | loff_t from, size_t len, size_t *retlen, u_char *buf) | |
557 | { | |
558 | struct spi_message m; | |
559 | const size_t l = 4 + 64; | |
560 | uint8_t *scratch; | |
561 | struct spi_transfer t; | |
562 | struct dataflash *priv = (struct dataflash *)mtd->priv; | |
563 | int status; | |
564 | ||
565 | if (len > 64) | |
566 | return -EINVAL; | |
567 | ||
568 | /* Strictly speaking, we *could* truncate the write ... but | |
569 | * let's not do that for the only write that's ever possible. | |
570 | */ | |
571 | if ((from + len) > 64) | |
572 | return -EINVAL; | |
573 | ||
574 | /* OUT: OP_WRITE_SECURITY, 3 zeroes, 64 data-or-zero bytes | |
575 | * IN: ignore all | |
576 | */ | |
577 | scratch = kzalloc(l, GFP_KERNEL); | |
578 | if (!scratch) | |
579 | return -ENOMEM; | |
580 | scratch[0] = OP_WRITE_SECURITY; | |
581 | memcpy(scratch + 4 + from, buf, len); | |
582 | ||
583 | spi_message_init(&m); | |
584 | ||
585 | memset(&t, 0, sizeof t); | |
586 | t.tx_buf = scratch; | |
587 | t.len = l; | |
588 | spi_message_add_tail(&t, &m); | |
589 | ||
590 | /* Write the OTP bits, if they've not yet been written. | |
591 | * This modifies SRAM buffer1. | |
592 | */ | |
593 | mutex_lock(&priv->lock); | |
594 | dataflash_waitready(priv->spi); | |
595 | status = spi_sync(priv->spi, &m); | |
596 | mutex_unlock(&priv->lock); | |
597 | ||
598 | kfree(scratch); | |
599 | ||
600 | if (status >= 0) { | |
601 | status = 0; | |
602 | *retlen = len; | |
603 | } | |
604 | return status; | |
605 | } | |
606 | ||
607 | static char *otp_setup(struct mtd_info *device, char revision) | |
608 | { | |
609 | device->get_fact_prot_info = dataflash_get_otp_info; | |
610 | device->read_fact_prot_reg = dataflash_read_fact_otp; | |
611 | device->get_user_prot_info = dataflash_get_otp_info; | |
612 | device->read_user_prot_reg = dataflash_read_user_otp; | |
613 | ||
614 | /* rev c parts (at45db321c and at45db1281 only!) use a | |
615 | * different write procedure; not (yet?) implemented. | |
616 | */ | |
617 | if (revision > 'c') | |
618 | device->write_user_prot_reg = dataflash_write_user_otp; | |
619 | ||
620 | return ", OTP"; | |
621 | } | |
622 | ||
623 | #else | |
624 | ||
cf93ae02 | 625 | static char *otp_setup(struct mtd_info *device, char revision) |
34a82443 DB |
626 | { |
627 | return " (OTP)"; | |
628 | } | |
629 | ||
630 | #endif | |
631 | ||
632 | /* ......................................................................... */ | |
633 | ||
1d6432fe DB |
634 | /* |
635 | * Register DataFlash device with MTD subsystem. | |
636 | */ | |
637 | static int __devinit | |
34a82443 DB |
638 | add_dataflash_otp(struct spi_device *spi, char *name, |
639 | int nr_pages, int pagesize, int pageoffset, char revision) | |
1d6432fe DB |
640 | { |
641 | struct dataflash *priv; | |
642 | struct mtd_info *device; | |
643 | struct flash_platform_data *pdata = spi->dev.platform_data; | |
34a82443 | 644 | char *otp_tag = ""; |
1d6432fe | 645 | |
5cbded58 | 646 | priv = kzalloc(sizeof *priv, GFP_KERNEL); |
1d6432fe DB |
647 | if (!priv) |
648 | return -ENOMEM; | |
649 | ||
ec9ce52e | 650 | mutex_init(&priv->lock); |
1d6432fe DB |
651 | priv->spi = spi; |
652 | priv->page_size = pagesize; | |
653 | priv->page_offset = pageoffset; | |
654 | ||
655 | /* name must be usable with cmdlinepart */ | |
656 | sprintf(priv->name, "spi%d.%d-%s", | |
657 | spi->master->bus_num, spi->chip_select, | |
658 | name); | |
659 | ||
660 | device = &priv->mtd; | |
661 | device->name = (pdata && pdata->name) ? pdata->name : priv->name; | |
662 | device->size = nr_pages * pagesize; | |
663 | device->erasesize = pagesize; | |
17ffc7ba | 664 | device->writesize = pagesize; |
1d6432fe DB |
665 | device->owner = THIS_MODULE; |
666 | device->type = MTD_DATAFLASH; | |
6c33cafc | 667 | device->flags = MTD_WRITEABLE; |
1d6432fe DB |
668 | device->erase = dataflash_erase; |
669 | device->read = dataflash_read; | |
670 | device->write = dataflash_write; | |
671 | device->priv = priv; | |
672 | ||
34a82443 DB |
673 | if (revision >= 'c') |
674 | otp_tag = otp_setup(device, revision); | |
675 | ||
5b7f3a50 AB |
676 | dev_info(&spi->dev, "%s (%lld KBytes) pagesize %d bytes%s\n", |
677 | name, (long long)((device->size + 1023) >> 10), | |
34a82443 | 678 | pagesize, otp_tag); |
1d6432fe DB |
679 | dev_set_drvdata(&spi->dev, priv); |
680 | ||
681 | if (mtd_has_partitions()) { | |
682 | struct mtd_partition *parts; | |
683 | int nr_parts = 0; | |
684 | ||
685 | #ifdef CONFIG_MTD_CMDLINE_PARTS | |
686 | static const char *part_probes[] = { "cmdlinepart", NULL, }; | |
687 | ||
688 | nr_parts = parse_mtd_partitions(device, part_probes, &parts, 0); | |
689 | #endif | |
690 | ||
691 | if (nr_parts <= 0 && pdata && pdata->parts) { | |
692 | parts = pdata->parts; | |
693 | nr_parts = pdata->nr_parts; | |
694 | } | |
695 | ||
696 | if (nr_parts > 0) { | |
697 | priv->partitioned = 1; | |
698 | return add_mtd_partitions(device, parts, nr_parts); | |
699 | } | |
7111763d | 700 | } else if (pdata && pdata->nr_parts) |
1d6432fe DB |
701 | dev_warn(&spi->dev, "ignoring %d default partitions on %s\n", |
702 | pdata->nr_parts, device->name); | |
703 | ||
704 | return add_mtd_device(device) == 1 ? -ENODEV : 0; | |
705 | } | |
706 | ||
34a82443 DB |
707 | static inline int __devinit |
708 | add_dataflash(struct spi_device *spi, char *name, | |
709 | int nr_pages, int pagesize, int pageoffset) | |
710 | { | |
711 | return add_dataflash_otp(spi, name, nr_pages, pagesize, | |
712 | pageoffset, 0); | |
713 | } | |
714 | ||
e9d42227 MH |
715 | struct flash_info { |
716 | char *name; | |
717 | ||
771999b6 | 718 | /* JEDEC id has a high byte of zero plus three data bytes: |
719 | * the manufacturer id, then a two byte device id. | |
e9d42227 | 720 | */ |
271c5c59 | 721 | uint32_t jedec_id; |
e9d42227 | 722 | |
771999b6 | 723 | /* The size listed here is what works with OP_ERASE_PAGE. */ |
e9d42227 | 724 | unsigned nr_pages; |
271c5c59 DW |
725 | uint16_t pagesize; |
726 | uint16_t pageoffset; | |
e9d42227 | 727 | |
271c5c59 | 728 | uint16_t flags; |
771999b6 | 729 | #define SUP_POW2PS 0x0002 /* supports 2^N byte pages */ |
730 | #define IS_POW2PS 0x0001 /* uses 2^N byte pages */ | |
e9d42227 MH |
731 | }; |
732 | ||
733 | static struct flash_info __devinitdata dataflash_data [] = { | |
734 | ||
771999b6 | 735 | /* |
736 | * NOTE: chips with SUP_POW2PS (rev D and up) need two entries, | |
737 | * one with IS_POW2PS and the other without. The entry with the | |
738 | * non-2^N byte page size can't name exact chip revisions without | |
739 | * losing backwards compatibility for cmdlinepart. | |
740 | * | |
741 | * These newer chips also support 128-byte security registers (with | |
742 | * 64 bytes one-time-programmable) and software write-protection. | |
743 | */ | |
744 | { "AT45DB011B", 0x1f2200, 512, 264, 9, SUP_POW2PS}, | |
e9d42227 MH |
745 | { "at45db011d", 0x1f2200, 512, 256, 8, SUP_POW2PS | IS_POW2PS}, |
746 | ||
771999b6 | 747 | { "AT45DB021B", 0x1f2300, 1024, 264, 9, SUP_POW2PS}, |
e9d42227 MH |
748 | { "at45db021d", 0x1f2300, 1024, 256, 8, SUP_POW2PS | IS_POW2PS}, |
749 | ||
771999b6 | 750 | { "AT45DB041x", 0x1f2400, 2048, 264, 9, SUP_POW2PS}, |
e9d42227 MH |
751 | { "at45db041d", 0x1f2400, 2048, 256, 8, SUP_POW2PS | IS_POW2PS}, |
752 | ||
771999b6 | 753 | { "AT45DB081B", 0x1f2500, 4096, 264, 9, SUP_POW2PS}, |
e9d42227 MH |
754 | { "at45db081d", 0x1f2500, 4096, 256, 8, SUP_POW2PS | IS_POW2PS}, |
755 | ||
771999b6 | 756 | { "AT45DB161x", 0x1f2600, 4096, 528, 10, SUP_POW2PS}, |
e9d42227 MH |
757 | { "at45db161d", 0x1f2600, 4096, 512, 9, SUP_POW2PS | IS_POW2PS}, |
758 | ||
771999b6 | 759 | { "AT45DB321x", 0x1f2700, 8192, 528, 10, 0}, /* rev C */ |
e9d42227 | 760 | |
771999b6 | 761 | { "AT45DB321x", 0x1f2701, 8192, 528, 10, SUP_POW2PS}, |
e9d42227 MH |
762 | { "at45db321d", 0x1f2701, 8192, 512, 9, SUP_POW2PS | IS_POW2PS}, |
763 | ||
771999b6 | 764 | { "AT45DB642x", 0x1f2800, 8192, 1056, 11, SUP_POW2PS}, |
765 | { "at45db642d", 0x1f2800, 8192, 1024, 10, SUP_POW2PS | IS_POW2PS}, | |
e9d42227 MH |
766 | }; |
767 | ||
768 | static struct flash_info *__devinit jedec_probe(struct spi_device *spi) | |
769 | { | |
770 | int tmp; | |
271c5c59 DW |
771 | uint8_t code = OP_READ_ID; |
772 | uint8_t id[3]; | |
773 | uint32_t jedec; | |
e9d42227 MH |
774 | struct flash_info *info; |
775 | int status; | |
776 | ||
e9d42227 MH |
777 | /* JEDEC also defines an optional "extended device information" |
778 | * string for after vendor-specific data, after the three bytes | |
779 | * we use here. Supporting some chips might require using it. | |
771999b6 | 780 | * |
781 | * If the vendor ID isn't Atmel's (0x1f), assume this call failed. | |
782 | * That's not an error; only rev C and newer chips handle it, and | |
783 | * only Atmel sells these chips. | |
e9d42227 MH |
784 | */ |
785 | tmp = spi_write_then_read(spi, &code, 1, id, 3); | |
786 | if (tmp < 0) { | |
787 | DEBUG(MTD_DEBUG_LEVEL0, "%s: error %d reading JEDEC ID\n", | |
160bbab3 | 788 | dev_name(&spi->dev), tmp); |
771999b6 | 789 | return ERR_PTR(tmp); |
e9d42227 | 790 | } |
771999b6 | 791 | if (id[0] != 0x1f) |
792 | return NULL; | |
793 | ||
e9d42227 MH |
794 | jedec = id[0]; |
795 | jedec = jedec << 8; | |
796 | jedec |= id[1]; | |
797 | jedec = jedec << 8; | |
798 | jedec |= id[2]; | |
799 | ||
800 | for (tmp = 0, info = dataflash_data; | |
801 | tmp < ARRAY_SIZE(dataflash_data); | |
802 | tmp++, info++) { | |
803 | if (info->jedec_id == jedec) { | |
771999b6 | 804 | DEBUG(MTD_DEBUG_LEVEL1, "%s: OTP, sector protect%s\n", |
805 | dev_name(&spi->dev), | |
806 | (info->flags & SUP_POW2PS) | |
807 | ? ", binary pagesize" : "" | |
808 | ); | |
e9d42227 MH |
809 | if (info->flags & SUP_POW2PS) { |
810 | status = dataflash_status(spi); | |
771999b6 | 811 | if (status < 0) { |
812 | DEBUG(MTD_DEBUG_LEVEL1, | |
813 | "%s: status error %d\n", | |
814 | dev_name(&spi->dev), status); | |
815 | return ERR_PTR(status); | |
816 | } | |
817 | if (status & 0x1) { | |
818 | if (info->flags & IS_POW2PS) | |
819 | return info; | |
820 | } else { | |
821 | if (!(info->flags & IS_POW2PS)) | |
822 | return info; | |
823 | } | |
229cc58b WN |
824 | } else |
825 | return info; | |
e9d42227 MH |
826 | } |
827 | } | |
771999b6 | 828 | |
829 | /* | |
830 | * Treat other chips as errors ... we won't know the right page | |
831 | * size (it might be binary) even when we can tell which density | |
832 | * class is involved (legacy chip id scheme). | |
833 | */ | |
834 | dev_warn(&spi->dev, "JEDEC id %06x not handled\n", jedec); | |
835 | return ERR_PTR(-ENODEV); | |
e9d42227 MH |
836 | } |
837 | ||
771999b6 | 838 | /* |
839 | * Detect and initialize DataFlash device, using JEDEC IDs on newer chips | |
840 | * or else the ID code embedded in the status bits: | |
841 | * | |
842 | * Device Density ID code #Pages PageSize Offset | |
843 | * AT45DB011B 1Mbit (128K) xx0011xx (0x0c) 512 264 9 | |
844 | * AT45DB021B 2Mbit (256K) xx0101xx (0x14) 1024 264 9 | |
845 | * AT45DB041B 4Mbit (512K) xx0111xx (0x1c) 2048 264 9 | |
846 | * AT45DB081B 8Mbit (1M) xx1001xx (0x24) 4096 264 9 | |
847 | * AT45DB0161B 16Mbit (2M) xx1011xx (0x2c) 4096 528 10 | |
848 | * AT45DB0321B 32Mbit (4M) xx1101xx (0x34) 8192 528 10 | |
849 | * AT45DB0642 64Mbit (8M) xx111xxx (0x3c) 8192 1056 11 | |
850 | * AT45DB1282 128Mbit (16M) xx0100xx (0x10) 16384 1056 11 | |
851 | */ | |
1d6432fe DB |
852 | static int __devinit dataflash_probe(struct spi_device *spi) |
853 | { | |
854 | int status; | |
e9d42227 MH |
855 | struct flash_info *info; |
856 | ||
857 | /* | |
858 | * Try to detect dataflash by JEDEC ID. | |
859 | * If it succeeds we know we have either a C or D part. | |
860 | * D will support power of 2 pagesize option. | |
34a82443 DB |
861 | * Both support the security register, though with different |
862 | * write procedures. | |
e9d42227 | 863 | */ |
e9d42227 | 864 | info = jedec_probe(spi); |
771999b6 | 865 | if (IS_ERR(info)) |
866 | return PTR_ERR(info); | |
e9d42227 | 867 | if (info != NULL) |
34a82443 DB |
868 | return add_dataflash_otp(spi, info->name, info->nr_pages, |
869 | info->pagesize, info->pageoffset, | |
870 | (info->flags & SUP_POW2PS) ? 'd' : 'c'); | |
e9d42227 | 871 | |
771999b6 | 872 | /* |
873 | * Older chips support only legacy commands, identifing | |
874 | * capacity using bits in the status byte. | |
875 | */ | |
1d6432fe DB |
876 | status = dataflash_status(spi); |
877 | if (status <= 0 || status == 0xff) { | |
878 | DEBUG(MTD_DEBUG_LEVEL1, "%s: status error %d\n", | |
160bbab3 | 879 | dev_name(&spi->dev), status); |
de4fa992 | 880 | if (status == 0 || status == 0xff) |
1d6432fe DB |
881 | status = -ENODEV; |
882 | return status; | |
883 | } | |
884 | ||
885 | /* if there's a device there, assume it's dataflash. | |
886 | * board setup should have set spi->max_speed_max to | |
887 | * match f(car) for continuous reads, mode 0 or 3. | |
888 | */ | |
889 | switch (status & 0x3c) { | |
890 | case 0x0c: /* 0 0 1 1 x x */ | |
891 | status = add_dataflash(spi, "AT45DB011B", 512, 264, 9); | |
892 | break; | |
893 | case 0x14: /* 0 1 0 1 x x */ | |
e9d42227 | 894 | status = add_dataflash(spi, "AT45DB021B", 1024, 264, 9); |
1d6432fe DB |
895 | break; |
896 | case 0x1c: /* 0 1 1 1 x x */ | |
771999b6 | 897 | status = add_dataflash(spi, "AT45DB041x", 2048, 264, 9); |
1d6432fe DB |
898 | break; |
899 | case 0x24: /* 1 0 0 1 x x */ | |
900 | status = add_dataflash(spi, "AT45DB081B", 4096, 264, 9); | |
901 | break; | |
902 | case 0x2c: /* 1 0 1 1 x x */ | |
771999b6 | 903 | status = add_dataflash(spi, "AT45DB161x", 4096, 528, 10); |
1d6432fe DB |
904 | break; |
905 | case 0x34: /* 1 1 0 1 x x */ | |
906 | status = add_dataflash(spi, "AT45DB321x", 8192, 528, 10); | |
907 | break; | |
908 | case 0x38: /* 1 1 1 x x x */ | |
909 | case 0x3c: | |
910 | status = add_dataflash(spi, "AT45DB642x", 8192, 1056, 11); | |
911 | break; | |
912 | /* obsolete AT45DB1282 not (yet?) supported */ | |
913 | default: | |
914 | DEBUG(MTD_DEBUG_LEVEL1, "%s: unsupported device (%x)\n", | |
160bbab3 | 915 | dev_name(&spi->dev), status & 0x3c); |
1d6432fe DB |
916 | status = -ENODEV; |
917 | } | |
918 | ||
919 | if (status < 0) | |
920 | DEBUG(MTD_DEBUG_LEVEL1, "%s: add_dataflash --> %d\n", | |
160bbab3 | 921 | dev_name(&spi->dev), status); |
1d6432fe DB |
922 | |
923 | return status; | |
924 | } | |
925 | ||
926 | static int __devexit dataflash_remove(struct spi_device *spi) | |
927 | { | |
928 | struct dataflash *flash = dev_get_drvdata(&spi->dev); | |
929 | int status; | |
930 | ||
160bbab3 | 931 | DEBUG(MTD_DEBUG_LEVEL1, "%s: remove\n", dev_name(&spi->dev)); |
1d6432fe DB |
932 | |
933 | if (mtd_has_partitions() && flash->partitioned) | |
934 | status = del_mtd_partitions(&flash->mtd); | |
935 | else | |
936 | status = del_mtd_device(&flash->mtd); | |
937 | if (status == 0) | |
938 | kfree(flash); | |
939 | return status; | |
940 | } | |
941 | ||
942 | static struct spi_driver dataflash_driver = { | |
943 | .driver = { | |
944 | .name = "mtd_dataflash", | |
945 | .bus = &spi_bus_type, | |
946 | .owner = THIS_MODULE, | |
947 | }, | |
948 | ||
949 | .probe = dataflash_probe, | |
950 | .remove = __devexit_p(dataflash_remove), | |
951 | ||
952 | /* FIXME: investigate suspend and resume... */ | |
953 | }; | |
954 | ||
955 | static int __init dataflash_init(void) | |
956 | { | |
957 | return spi_register_driver(&dataflash_driver); | |
958 | } | |
959 | module_init(dataflash_init); | |
960 | ||
961 | static void __exit dataflash_exit(void) | |
962 | { | |
963 | spi_unregister_driver(&dataflash_driver); | |
964 | } | |
965 | module_exit(dataflash_exit); | |
966 | ||
967 | ||
968 | MODULE_LICENSE("GPL"); | |
969 | MODULE_AUTHOR("Andrew Victor, David Brownell"); | |
970 | MODULE_DESCRIPTION("MTD DataFlash driver"); |