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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> |
1d6432fe DB |
18 | #include <linux/spi/spi.h> |
19 | #include <linux/spi/flash.h> | |
20 | ||
21 | #include <linux/mtd/mtd.h> | |
22 | #include <linux/mtd/partitions.h> | |
23 | ||
24 | ||
25 | /* | |
26 | * DataFlash is a kind of SPI flash. Most AT45 chips have two buffers in | |
27 | * each chip, which may be used for double buffered I/O; but this driver | |
28 | * doesn't (yet) use these for any kind of i/o overlap or prefetching. | |
29 | * | |
30 | * Sometimes DataFlash is packaged in MMC-format cards, although the | |
31 | * MMC stack can't use SPI (yet), or distinguish between MMC and DataFlash | |
32 | * protocols during enumeration. | |
33 | */ | |
34 | ||
35 | #define CONFIG_DATAFLASH_WRITE_VERIFY | |
36 | ||
37 | /* reads can bypass the buffers */ | |
38 | #define OP_READ_CONTINUOUS 0xE8 | |
39 | #define OP_READ_PAGE 0xD2 | |
40 | ||
41 | /* group B requests can run even while status reports "busy" */ | |
42 | #define OP_READ_STATUS 0xD7 /* group B */ | |
43 | ||
44 | /* move data between host and buffer */ | |
45 | #define OP_READ_BUFFER1 0xD4 /* group B */ | |
46 | #define OP_READ_BUFFER2 0xD6 /* group B */ | |
47 | #define OP_WRITE_BUFFER1 0x84 /* group B */ | |
48 | #define OP_WRITE_BUFFER2 0x87 /* group B */ | |
49 | ||
50 | /* erasing flash */ | |
51 | #define OP_ERASE_PAGE 0x81 | |
52 | #define OP_ERASE_BLOCK 0x50 | |
53 | ||
54 | /* move data between buffer and flash */ | |
55 | #define OP_TRANSFER_BUF1 0x53 | |
56 | #define OP_TRANSFER_BUF2 0x55 | |
57 | #define OP_MREAD_BUFFER1 0xD4 | |
58 | #define OP_MREAD_BUFFER2 0xD6 | |
59 | #define OP_MWERASE_BUFFER1 0x83 | |
60 | #define OP_MWERASE_BUFFER2 0x86 | |
61 | #define OP_MWRITE_BUFFER1 0x88 /* sector must be pre-erased */ | |
62 | #define OP_MWRITE_BUFFER2 0x89 /* sector must be pre-erased */ | |
63 | ||
64 | /* write to buffer, then write-erase to flash */ | |
65 | #define OP_PROGRAM_VIA_BUF1 0x82 | |
66 | #define OP_PROGRAM_VIA_BUF2 0x85 | |
67 | ||
68 | /* compare buffer to flash */ | |
69 | #define OP_COMPARE_BUF1 0x60 | |
70 | #define OP_COMPARE_BUF2 0x61 | |
71 | ||
72 | /* read flash to buffer, then write-erase to flash */ | |
73 | #define OP_REWRITE_VIA_BUF1 0x58 | |
74 | #define OP_REWRITE_VIA_BUF2 0x59 | |
75 | ||
76 | /* newer chips report JEDEC manufacturer and device IDs; chip | |
77 | * serial number and OTP bits; and per-sector writeprotect. | |
78 | */ | |
79 | #define OP_READ_ID 0x9F | |
80 | #define OP_READ_SECURITY 0x77 | |
81 | #define OP_WRITE_SECURITY 0x9A /* OTP bits */ | |
82 | ||
83 | ||
84 | struct dataflash { | |
85 | u8 command[4]; | |
86 | char name[24]; | |
87 | ||
88 | unsigned partitioned:1; | |
89 | ||
90 | unsigned short page_offset; /* offset in flash address */ | |
91 | unsigned int page_size; /* of bytes per page */ | |
92 | ||
ec9ce52e | 93 | struct mutex lock; |
1d6432fe DB |
94 | struct spi_device *spi; |
95 | ||
96 | struct mtd_info mtd; | |
97 | }; | |
98 | ||
99 | #ifdef CONFIG_MTD_PARTITIONS | |
100 | #define mtd_has_partitions() (1) | |
101 | #else | |
102 | #define mtd_has_partitions() (0) | |
103 | #endif | |
104 | ||
105 | /* ......................................................................... */ | |
106 | ||
107 | /* | |
108 | * Return the status of the DataFlash device. | |
109 | */ | |
110 | static inline int dataflash_status(struct spi_device *spi) | |
111 | { | |
112 | /* NOTE: at45db321c over 25 MHz wants to write | |
113 | * a dummy byte after the opcode... | |
114 | */ | |
115 | return spi_w8r8(spi, OP_READ_STATUS); | |
116 | } | |
117 | ||
118 | /* | |
119 | * Poll the DataFlash device until it is READY. | |
120 | * This usually takes 5-20 msec or so; more for sector erase. | |
121 | */ | |
122 | static int dataflash_waitready(struct spi_device *spi) | |
123 | { | |
124 | int status; | |
125 | ||
126 | for (;;) { | |
127 | status = dataflash_status(spi); | |
128 | if (status < 0) { | |
129 | DEBUG(MTD_DEBUG_LEVEL1, "%s: status %d?\n", | |
130 | spi->dev.bus_id, status); | |
131 | status = 0; | |
132 | } | |
133 | ||
134 | if (status & (1 << 7)) /* RDY/nBSY */ | |
135 | return status; | |
136 | ||
137 | msleep(3); | |
138 | } | |
139 | } | |
140 | ||
141 | /* ......................................................................... */ | |
142 | ||
143 | /* | |
144 | * Erase pages of flash. | |
145 | */ | |
146 | static int dataflash_erase(struct mtd_info *mtd, struct erase_info *instr) | |
147 | { | |
148 | struct dataflash *priv = (struct dataflash *)mtd->priv; | |
149 | struct spi_device *spi = priv->spi; | |
8275c642 | 150 | struct spi_transfer x = { .tx_dma = 0, }; |
1d6432fe DB |
151 | struct spi_message msg; |
152 | unsigned blocksize = priv->page_size << 3; | |
153 | u8 *command; | |
154 | ||
155 | DEBUG(MTD_DEBUG_LEVEL2, "%s: erase addr=0x%x len 0x%x\n", | |
156 | spi->dev.bus_id, | |
157 | instr->addr, instr->len); | |
158 | ||
159 | /* Sanity checks */ | |
160 | if ((instr->addr + instr->len) > mtd->size | |
161 | || (instr->len % priv->page_size) != 0 | |
162 | || (instr->addr % priv->page_size) != 0) | |
163 | return -EINVAL; | |
164 | ||
8275c642 VW |
165 | spi_message_init(&msg); |
166 | ||
167 | x.tx_buf = command = priv->command; | |
168 | x.len = 4; | |
169 | spi_message_add_tail(&x, &msg); | |
1d6432fe | 170 | |
ec9ce52e | 171 | mutex_lock(&priv->lock); |
1d6432fe DB |
172 | while (instr->len > 0) { |
173 | unsigned int pageaddr; | |
174 | int status; | |
175 | int do_block; | |
176 | ||
177 | /* Calculate flash page address; use block erase (for speed) if | |
178 | * we're at a block boundary and need to erase the whole block. | |
179 | */ | |
180 | pageaddr = instr->addr / priv->page_size; | |
3cb4f09f | 181 | do_block = (pageaddr & 0x7) == 0 && instr->len >= blocksize; |
1d6432fe DB |
182 | pageaddr = pageaddr << priv->page_offset; |
183 | ||
184 | command[0] = do_block ? OP_ERASE_BLOCK : OP_ERASE_PAGE; | |
185 | command[1] = (u8)(pageaddr >> 16); | |
186 | command[2] = (u8)(pageaddr >> 8); | |
187 | command[3] = 0; | |
188 | ||
189 | DEBUG(MTD_DEBUG_LEVEL3, "ERASE %s: (%x) %x %x %x [%i]\n", | |
190 | do_block ? "block" : "page", | |
191 | command[0], command[1], command[2], command[3], | |
192 | pageaddr); | |
193 | ||
194 | status = spi_sync(spi, &msg); | |
195 | (void) dataflash_waitready(spi); | |
196 | ||
197 | if (status < 0) { | |
198 | printk(KERN_ERR "%s: erase %x, err %d\n", | |
199 | spi->dev.bus_id, pageaddr, status); | |
200 | /* REVISIT: can retry instr->retries times; or | |
201 | * giveup and instr->fail_addr = instr->addr; | |
202 | */ | |
203 | continue; | |
204 | } | |
205 | ||
206 | if (do_block) { | |
207 | instr->addr += blocksize; | |
208 | instr->len -= blocksize; | |
209 | } else { | |
210 | instr->addr += priv->page_size; | |
211 | instr->len -= priv->page_size; | |
212 | } | |
213 | } | |
ec9ce52e | 214 | mutex_unlock(&priv->lock); |
1d6432fe DB |
215 | |
216 | /* Inform MTD subsystem that erase is complete */ | |
217 | instr->state = MTD_ERASE_DONE; | |
218 | mtd_erase_callback(instr); | |
219 | ||
220 | return 0; | |
221 | } | |
222 | ||
223 | /* | |
224 | * Read from the DataFlash device. | |
225 | * from : Start offset in flash device | |
226 | * len : Amount to read | |
227 | * retlen : About of data actually read | |
228 | * buf : Buffer containing the data | |
229 | */ | |
230 | static int dataflash_read(struct mtd_info *mtd, loff_t from, size_t len, | |
231 | size_t *retlen, u_char *buf) | |
232 | { | |
233 | struct dataflash *priv = (struct dataflash *)mtd->priv; | |
234 | struct spi_transfer x[2] = { { .tx_dma = 0, }, }; | |
235 | struct spi_message msg; | |
236 | unsigned int addr; | |
237 | u8 *command; | |
238 | int status; | |
239 | ||
240 | DEBUG(MTD_DEBUG_LEVEL2, "%s: read 0x%x..0x%x\n", | |
241 | priv->spi->dev.bus_id, (unsigned)from, (unsigned)(from + len)); | |
242 | ||
243 | *retlen = 0; | |
244 | ||
245 | /* Sanity checks */ | |
246 | if (!len) | |
247 | return 0; | |
248 | if (from + len > mtd->size) | |
249 | return -EINVAL; | |
250 | ||
251 | /* Calculate flash page/byte address */ | |
252 | addr = (((unsigned)from / priv->page_size) << priv->page_offset) | |
253 | + ((unsigned)from % priv->page_size); | |
254 | ||
255 | command = priv->command; | |
256 | ||
257 | DEBUG(MTD_DEBUG_LEVEL3, "READ: (%x) %x %x %x\n", | |
258 | command[0], command[1], command[2], command[3]); | |
259 | ||
8275c642 VW |
260 | spi_message_init(&msg); |
261 | ||
1d6432fe DB |
262 | x[0].tx_buf = command; |
263 | x[0].len = 8; | |
8275c642 VW |
264 | spi_message_add_tail(&x[0], &msg); |
265 | ||
1d6432fe DB |
266 | x[1].rx_buf = buf; |
267 | x[1].len = len; | |
8275c642 | 268 | spi_message_add_tail(&x[1], &msg); |
1d6432fe | 269 | |
ec9ce52e | 270 | mutex_lock(&priv->lock); |
1d6432fe DB |
271 | |
272 | /* Continuous read, max clock = f(car) which may be less than | |
273 | * the peak rate available. Some chips support commands with | |
274 | * fewer "don't care" bytes. Both buffers stay unchanged. | |
275 | */ | |
276 | command[0] = OP_READ_CONTINUOUS; | |
277 | command[1] = (u8)(addr >> 16); | |
278 | command[2] = (u8)(addr >> 8); | |
279 | command[3] = (u8)(addr >> 0); | |
280 | /* plus 4 "don't care" bytes */ | |
281 | ||
282 | status = spi_sync(priv->spi, &msg); | |
ec9ce52e | 283 | mutex_unlock(&priv->lock); |
1d6432fe DB |
284 | |
285 | if (status >= 0) { | |
286 | *retlen = msg.actual_length - 8; | |
287 | status = 0; | |
288 | } else | |
289 | DEBUG(MTD_DEBUG_LEVEL1, "%s: read %x..%x --> %d\n", | |
290 | priv->spi->dev.bus_id, | |
291 | (unsigned)from, (unsigned)(from + len), | |
292 | status); | |
293 | return status; | |
294 | } | |
295 | ||
296 | /* | |
297 | * Write to the DataFlash device. | |
298 | * to : Start offset in flash device | |
299 | * len : Amount to write | |
300 | * retlen : Amount of data actually written | |
301 | * buf : Buffer containing the data | |
302 | */ | |
303 | static int dataflash_write(struct mtd_info *mtd, loff_t to, size_t len, | |
304 | size_t * retlen, const u_char * buf) | |
305 | { | |
306 | struct dataflash *priv = (struct dataflash *)mtd->priv; | |
307 | struct spi_device *spi = priv->spi; | |
308 | struct spi_transfer x[2] = { { .tx_dma = 0, }, }; | |
309 | struct spi_message msg; | |
310 | unsigned int pageaddr, addr, offset, writelen; | |
311 | size_t remaining = len; | |
312 | u_char *writebuf = (u_char *) buf; | |
313 | int status = -EINVAL; | |
314 | u8 *command; | |
315 | ||
316 | DEBUG(MTD_DEBUG_LEVEL2, "%s: write 0x%x..0x%x\n", | |
317 | spi->dev.bus_id, (unsigned)to, (unsigned)(to + len)); | |
318 | ||
319 | *retlen = 0; | |
320 | ||
321 | /* Sanity checks */ | |
322 | if (!len) | |
323 | return 0; | |
324 | if ((to + len) > mtd->size) | |
325 | return -EINVAL; | |
326 | ||
8275c642 VW |
327 | spi_message_init(&msg); |
328 | ||
1d6432fe DB |
329 | x[0].tx_buf = command = priv->command; |
330 | x[0].len = 4; | |
8275c642 | 331 | spi_message_add_tail(&x[0], &msg); |
1d6432fe DB |
332 | |
333 | pageaddr = ((unsigned)to / priv->page_size); | |
334 | offset = ((unsigned)to % priv->page_size); | |
335 | if (offset + len > priv->page_size) | |
336 | writelen = priv->page_size - offset; | |
337 | else | |
338 | writelen = len; | |
339 | ||
ec9ce52e | 340 | mutex_lock(&priv->lock); |
1d6432fe DB |
341 | while (remaining > 0) { |
342 | DEBUG(MTD_DEBUG_LEVEL3, "write @ %i:%i len=%i\n", | |
343 | pageaddr, offset, writelen); | |
344 | ||
345 | /* REVISIT: | |
346 | * (a) each page in a sector must be rewritten at least | |
347 | * once every 10K sibling erase/program operations. | |
348 | * (b) for pages that are already erased, we could | |
349 | * use WRITE+MWRITE not PROGRAM for ~30% speedup. | |
350 | * (c) WRITE to buffer could be done while waiting for | |
351 | * a previous MWRITE/MWERASE to complete ... | |
352 | * (d) error handling here seems to be mostly missing. | |
353 | * | |
354 | * Two persistent bits per page, plus a per-sector counter, | |
355 | * could support (a) and (b) ... we might consider using | |
356 | * the second half of sector zero, which is just one block, | |
357 | * to track that state. (On AT91, that sector should also | |
358 | * support boot-from-DataFlash.) | |
359 | */ | |
360 | ||
361 | addr = pageaddr << priv->page_offset; | |
362 | ||
363 | /* (1) Maybe transfer partial page to Buffer1 */ | |
364 | if (writelen != priv->page_size) { | |
365 | command[0] = OP_TRANSFER_BUF1; | |
366 | command[1] = (addr & 0x00FF0000) >> 16; | |
367 | command[2] = (addr & 0x0000FF00) >> 8; | |
368 | command[3] = 0; | |
369 | ||
370 | DEBUG(MTD_DEBUG_LEVEL3, "TRANSFER: (%x) %x %x %x\n", | |
371 | command[0], command[1], command[2], command[3]); | |
372 | ||
1d6432fe DB |
373 | status = spi_sync(spi, &msg); |
374 | if (status < 0) | |
375 | DEBUG(MTD_DEBUG_LEVEL1, "%s: xfer %u -> %d \n", | |
376 | spi->dev.bus_id, addr, status); | |
377 | ||
378 | (void) dataflash_waitready(priv->spi); | |
379 | } | |
380 | ||
381 | /* (2) Program full page via Buffer1 */ | |
382 | addr += offset; | |
383 | command[0] = OP_PROGRAM_VIA_BUF1; | |
384 | command[1] = (addr & 0x00FF0000) >> 16; | |
385 | command[2] = (addr & 0x0000FF00) >> 8; | |
386 | command[3] = (addr & 0x000000FF); | |
387 | ||
388 | DEBUG(MTD_DEBUG_LEVEL3, "PROGRAM: (%x) %x %x %x\n", | |
389 | command[0], command[1], command[2], command[3]); | |
390 | ||
391 | x[1].tx_buf = writebuf; | |
392 | x[1].len = writelen; | |
8275c642 | 393 | spi_message_add_tail(x + 1, &msg); |
1d6432fe | 394 | status = spi_sync(spi, &msg); |
8275c642 | 395 | spi_transfer_del(x + 1); |
1d6432fe DB |
396 | if (status < 0) |
397 | DEBUG(MTD_DEBUG_LEVEL1, "%s: pgm %u/%u -> %d \n", | |
398 | spi->dev.bus_id, addr, writelen, status); | |
399 | ||
400 | (void) dataflash_waitready(priv->spi); | |
401 | ||
8275c642 | 402 | |
1d6432fe DB |
403 | #ifdef CONFIG_DATAFLASH_WRITE_VERIFY |
404 | ||
405 | /* (3) Compare to Buffer1 */ | |
406 | addr = pageaddr << priv->page_offset; | |
407 | command[0] = OP_COMPARE_BUF1; | |
408 | command[1] = (addr & 0x00FF0000) >> 16; | |
409 | command[2] = (addr & 0x0000FF00) >> 8; | |
410 | command[3] = 0; | |
411 | ||
412 | DEBUG(MTD_DEBUG_LEVEL3, "COMPARE: (%x) %x %x %x\n", | |
413 | command[0], command[1], command[2], command[3]); | |
414 | ||
1d6432fe DB |
415 | status = spi_sync(spi, &msg); |
416 | if (status < 0) | |
417 | DEBUG(MTD_DEBUG_LEVEL1, "%s: compare %u -> %d \n", | |
418 | spi->dev.bus_id, addr, status); | |
419 | ||
420 | status = dataflash_waitready(priv->spi); | |
421 | ||
422 | /* Check result of the compare operation */ | |
423 | if ((status & (1 << 6)) == 1) { | |
424 | printk(KERN_ERR "%s: compare page %u, err %d\n", | |
425 | spi->dev.bus_id, pageaddr, status); | |
426 | remaining = 0; | |
427 | status = -EIO; | |
428 | break; | |
429 | } else | |
430 | status = 0; | |
431 | ||
432 | #endif /* CONFIG_DATAFLASH_WRITE_VERIFY */ | |
433 | ||
434 | remaining = remaining - writelen; | |
435 | pageaddr++; | |
436 | offset = 0; | |
437 | writebuf += writelen; | |
438 | *retlen += writelen; | |
439 | ||
440 | if (remaining > priv->page_size) | |
441 | writelen = priv->page_size; | |
442 | else | |
443 | writelen = remaining; | |
444 | } | |
ec9ce52e | 445 | mutex_unlock(&priv->lock); |
1d6432fe DB |
446 | |
447 | return status; | |
448 | } | |
449 | ||
450 | /* ......................................................................... */ | |
451 | ||
452 | /* | |
453 | * Register DataFlash device with MTD subsystem. | |
454 | */ | |
455 | static int __devinit | |
456 | add_dataflash(struct spi_device *spi, char *name, | |
457 | int nr_pages, int pagesize, int pageoffset) | |
458 | { | |
459 | struct dataflash *priv; | |
460 | struct mtd_info *device; | |
461 | struct flash_platform_data *pdata = spi->dev.platform_data; | |
462 | ||
5cbded58 | 463 | priv = kzalloc(sizeof *priv, GFP_KERNEL); |
1d6432fe DB |
464 | if (!priv) |
465 | return -ENOMEM; | |
466 | ||
ec9ce52e | 467 | mutex_init(&priv->lock); |
1d6432fe DB |
468 | priv->spi = spi; |
469 | priv->page_size = pagesize; | |
470 | priv->page_offset = pageoffset; | |
471 | ||
472 | /* name must be usable with cmdlinepart */ | |
473 | sprintf(priv->name, "spi%d.%d-%s", | |
474 | spi->master->bus_num, spi->chip_select, | |
475 | name); | |
476 | ||
477 | device = &priv->mtd; | |
478 | device->name = (pdata && pdata->name) ? pdata->name : priv->name; | |
479 | device->size = nr_pages * pagesize; | |
480 | device->erasesize = pagesize; | |
17ffc7ba | 481 | device->writesize = pagesize; |
1d6432fe DB |
482 | device->owner = THIS_MODULE; |
483 | device->type = MTD_DATAFLASH; | |
6c33cafc | 484 | device->flags = MTD_WRITEABLE; |
1d6432fe DB |
485 | device->erase = dataflash_erase; |
486 | device->read = dataflash_read; | |
487 | device->write = dataflash_write; | |
488 | device->priv = priv; | |
489 | ||
490 | dev_info(&spi->dev, "%s (%d KBytes)\n", name, device->size/1024); | |
491 | dev_set_drvdata(&spi->dev, priv); | |
492 | ||
493 | if (mtd_has_partitions()) { | |
494 | struct mtd_partition *parts; | |
495 | int nr_parts = 0; | |
496 | ||
497 | #ifdef CONFIG_MTD_CMDLINE_PARTS | |
498 | static const char *part_probes[] = { "cmdlinepart", NULL, }; | |
499 | ||
500 | nr_parts = parse_mtd_partitions(device, part_probes, &parts, 0); | |
501 | #endif | |
502 | ||
503 | if (nr_parts <= 0 && pdata && pdata->parts) { | |
504 | parts = pdata->parts; | |
505 | nr_parts = pdata->nr_parts; | |
506 | } | |
507 | ||
508 | if (nr_parts > 0) { | |
509 | priv->partitioned = 1; | |
510 | return add_mtd_partitions(device, parts, nr_parts); | |
511 | } | |
7111763d | 512 | } else if (pdata && pdata->nr_parts) |
1d6432fe DB |
513 | dev_warn(&spi->dev, "ignoring %d default partitions on %s\n", |
514 | pdata->nr_parts, device->name); | |
515 | ||
516 | return add_mtd_device(device) == 1 ? -ENODEV : 0; | |
517 | } | |
518 | ||
519 | /* | |
520 | * Detect and initialize DataFlash device: | |
521 | * | |
522 | * Device Density ID code #Pages PageSize Offset | |
523 | * AT45DB011B 1Mbit (128K) xx0011xx (0x0c) 512 264 9 | |
524 | * AT45DB021B 2Mbit (256K) xx0101xx (0x14) 1025 264 9 | |
525 | * AT45DB041B 4Mbit (512K) xx0111xx (0x1c) 2048 264 9 | |
526 | * AT45DB081B 8Mbit (1M) xx1001xx (0x24) 4096 264 9 | |
527 | * AT45DB0161B 16Mbit (2M) xx1011xx (0x2c) 4096 528 10 | |
528 | * AT45DB0321B 32Mbit (4M) xx1101xx (0x34) 8192 528 10 | |
529 | * AT45DB0642 64Mbit (8M) xx111xxx (0x3c) 8192 1056 11 | |
530 | * AT45DB1282 128Mbit (16M) xx0100xx (0x10) 16384 1056 11 | |
531 | */ | |
532 | static int __devinit dataflash_probe(struct spi_device *spi) | |
533 | { | |
534 | int status; | |
535 | ||
536 | status = dataflash_status(spi); | |
537 | if (status <= 0 || status == 0xff) { | |
538 | DEBUG(MTD_DEBUG_LEVEL1, "%s: status error %d\n", | |
539 | spi->dev.bus_id, status); | |
de4fa992 | 540 | if (status == 0 || status == 0xff) |
1d6432fe DB |
541 | status = -ENODEV; |
542 | return status; | |
543 | } | |
544 | ||
545 | /* if there's a device there, assume it's dataflash. | |
546 | * board setup should have set spi->max_speed_max to | |
547 | * match f(car) for continuous reads, mode 0 or 3. | |
548 | */ | |
549 | switch (status & 0x3c) { | |
550 | case 0x0c: /* 0 0 1 1 x x */ | |
551 | status = add_dataflash(spi, "AT45DB011B", 512, 264, 9); | |
552 | break; | |
553 | case 0x14: /* 0 1 0 1 x x */ | |
554 | status = add_dataflash(spi, "AT45DB021B", 1025, 264, 9); | |
555 | break; | |
556 | case 0x1c: /* 0 1 1 1 x x */ | |
557 | status = add_dataflash(spi, "AT45DB041x", 2048, 264, 9); | |
558 | break; | |
559 | case 0x24: /* 1 0 0 1 x x */ | |
560 | status = add_dataflash(spi, "AT45DB081B", 4096, 264, 9); | |
561 | break; | |
562 | case 0x2c: /* 1 0 1 1 x x */ | |
563 | status = add_dataflash(spi, "AT45DB161x", 4096, 528, 10); | |
564 | break; | |
565 | case 0x34: /* 1 1 0 1 x x */ | |
566 | status = add_dataflash(spi, "AT45DB321x", 8192, 528, 10); | |
567 | break; | |
568 | case 0x38: /* 1 1 1 x x x */ | |
569 | case 0x3c: | |
570 | status = add_dataflash(spi, "AT45DB642x", 8192, 1056, 11); | |
571 | break; | |
572 | /* obsolete AT45DB1282 not (yet?) supported */ | |
573 | default: | |
574 | DEBUG(MTD_DEBUG_LEVEL1, "%s: unsupported device (%x)\n", | |
575 | spi->dev.bus_id, status & 0x3c); | |
576 | status = -ENODEV; | |
577 | } | |
578 | ||
579 | if (status < 0) | |
580 | DEBUG(MTD_DEBUG_LEVEL1, "%s: add_dataflash --> %d\n", | |
581 | spi->dev.bus_id, status); | |
582 | ||
583 | return status; | |
584 | } | |
585 | ||
586 | static int __devexit dataflash_remove(struct spi_device *spi) | |
587 | { | |
588 | struct dataflash *flash = dev_get_drvdata(&spi->dev); | |
589 | int status; | |
590 | ||
591 | DEBUG(MTD_DEBUG_LEVEL1, "%s: remove\n", spi->dev.bus_id); | |
592 | ||
593 | if (mtd_has_partitions() && flash->partitioned) | |
594 | status = del_mtd_partitions(&flash->mtd); | |
595 | else | |
596 | status = del_mtd_device(&flash->mtd); | |
597 | if (status == 0) | |
598 | kfree(flash); | |
599 | return status; | |
600 | } | |
601 | ||
602 | static struct spi_driver dataflash_driver = { | |
603 | .driver = { | |
604 | .name = "mtd_dataflash", | |
605 | .bus = &spi_bus_type, | |
606 | .owner = THIS_MODULE, | |
607 | }, | |
608 | ||
609 | .probe = dataflash_probe, | |
610 | .remove = __devexit_p(dataflash_remove), | |
611 | ||
612 | /* FIXME: investigate suspend and resume... */ | |
613 | }; | |
614 | ||
615 | static int __init dataflash_init(void) | |
616 | { | |
617 | return spi_register_driver(&dataflash_driver); | |
618 | } | |
619 | module_init(dataflash_init); | |
620 | ||
621 | static void __exit dataflash_exit(void) | |
622 | { | |
623 | spi_unregister_driver(&dataflash_driver); | |
624 | } | |
625 | module_exit(dataflash_exit); | |
626 | ||
627 | ||
628 | MODULE_LICENSE("GPL"); | |
629 | MODULE_AUTHOR("Andrew Victor, David Brownell"); | |
630 | MODULE_DESCRIPTION("MTD DataFlash driver"); |