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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 | */ | |
12 | #include <linux/config.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/delay.h> | |
17 | #include <linux/device.h> | |
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 | ||
93 | struct semaphore lock; | |
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; | |
150 | struct spi_transfer x[1] = { { .tx_dma = 0, }, }; | |
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 | ||
165 | x[0].tx_buf = command = priv->command; | |
166 | x[0].len = 4; | |
167 | msg.transfers = x; | |
168 | msg.n_transfer = 1; | |
169 | ||
170 | down(&priv->lock); | |
171 | while (instr->len > 0) { | |
172 | unsigned int pageaddr; | |
173 | int status; | |
174 | int do_block; | |
175 | ||
176 | /* Calculate flash page address; use block erase (for speed) if | |
177 | * we're at a block boundary and need to erase the whole block. | |
178 | */ | |
179 | pageaddr = instr->addr / priv->page_size; | |
180 | do_block = (pageaddr & 0x7) == 0 && instr->len <= blocksize; | |
181 | pageaddr = pageaddr << priv->page_offset; | |
182 | ||
183 | command[0] = do_block ? OP_ERASE_BLOCK : OP_ERASE_PAGE; | |
184 | command[1] = (u8)(pageaddr >> 16); | |
185 | command[2] = (u8)(pageaddr >> 8); | |
186 | command[3] = 0; | |
187 | ||
188 | DEBUG(MTD_DEBUG_LEVEL3, "ERASE %s: (%x) %x %x %x [%i]\n", | |
189 | do_block ? "block" : "page", | |
190 | command[0], command[1], command[2], command[3], | |
191 | pageaddr); | |
192 | ||
193 | status = spi_sync(spi, &msg); | |
194 | (void) dataflash_waitready(spi); | |
195 | ||
196 | if (status < 0) { | |
197 | printk(KERN_ERR "%s: erase %x, err %d\n", | |
198 | spi->dev.bus_id, pageaddr, status); | |
199 | /* REVISIT: can retry instr->retries times; or | |
200 | * giveup and instr->fail_addr = instr->addr; | |
201 | */ | |
202 | continue; | |
203 | } | |
204 | ||
205 | if (do_block) { | |
206 | instr->addr += blocksize; | |
207 | instr->len -= blocksize; | |
208 | } else { | |
209 | instr->addr += priv->page_size; | |
210 | instr->len -= priv->page_size; | |
211 | } | |
212 | } | |
213 | up(&priv->lock); | |
214 | ||
215 | /* Inform MTD subsystem that erase is complete */ | |
216 | instr->state = MTD_ERASE_DONE; | |
217 | mtd_erase_callback(instr); | |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
222 | /* | |
223 | * Read from the DataFlash device. | |
224 | * from : Start offset in flash device | |
225 | * len : Amount to read | |
226 | * retlen : About of data actually read | |
227 | * buf : Buffer containing the data | |
228 | */ | |
229 | static int dataflash_read(struct mtd_info *mtd, loff_t from, size_t len, | |
230 | size_t *retlen, u_char *buf) | |
231 | { | |
232 | struct dataflash *priv = (struct dataflash *)mtd->priv; | |
233 | struct spi_transfer x[2] = { { .tx_dma = 0, }, }; | |
234 | struct spi_message msg; | |
235 | unsigned int addr; | |
236 | u8 *command; | |
237 | int status; | |
238 | ||
239 | DEBUG(MTD_DEBUG_LEVEL2, "%s: read 0x%x..0x%x\n", | |
240 | priv->spi->dev.bus_id, (unsigned)from, (unsigned)(from + len)); | |
241 | ||
242 | *retlen = 0; | |
243 | ||
244 | /* Sanity checks */ | |
245 | if (!len) | |
246 | return 0; | |
247 | if (from + len > mtd->size) | |
248 | return -EINVAL; | |
249 | ||
250 | /* Calculate flash page/byte address */ | |
251 | addr = (((unsigned)from / priv->page_size) << priv->page_offset) | |
252 | + ((unsigned)from % priv->page_size); | |
253 | ||
254 | command = priv->command; | |
255 | ||
256 | DEBUG(MTD_DEBUG_LEVEL3, "READ: (%x) %x %x %x\n", | |
257 | command[0], command[1], command[2], command[3]); | |
258 | ||
259 | x[0].tx_buf = command; | |
260 | x[0].len = 8; | |
261 | x[1].rx_buf = buf; | |
262 | x[1].len = len; | |
263 | msg.transfers = x; | |
264 | msg.n_transfer = 2; | |
265 | ||
266 | down(&priv->lock); | |
267 | ||
268 | /* Continuous read, max clock = f(car) which may be less than | |
269 | * the peak rate available. Some chips support commands with | |
270 | * fewer "don't care" bytes. Both buffers stay unchanged. | |
271 | */ | |
272 | command[0] = OP_READ_CONTINUOUS; | |
273 | command[1] = (u8)(addr >> 16); | |
274 | command[2] = (u8)(addr >> 8); | |
275 | command[3] = (u8)(addr >> 0); | |
276 | /* plus 4 "don't care" bytes */ | |
277 | ||
278 | status = spi_sync(priv->spi, &msg); | |
279 | up(&priv->lock); | |
280 | ||
281 | if (status >= 0) { | |
282 | *retlen = msg.actual_length - 8; | |
283 | status = 0; | |
284 | } else | |
285 | DEBUG(MTD_DEBUG_LEVEL1, "%s: read %x..%x --> %d\n", | |
286 | priv->spi->dev.bus_id, | |
287 | (unsigned)from, (unsigned)(from + len), | |
288 | status); | |
289 | return status; | |
290 | } | |
291 | ||
292 | /* | |
293 | * Write to the DataFlash device. | |
294 | * to : Start offset in flash device | |
295 | * len : Amount to write | |
296 | * retlen : Amount of data actually written | |
297 | * buf : Buffer containing the data | |
298 | */ | |
299 | static int dataflash_write(struct mtd_info *mtd, loff_t to, size_t len, | |
300 | size_t * retlen, const u_char * buf) | |
301 | { | |
302 | struct dataflash *priv = (struct dataflash *)mtd->priv; | |
303 | struct spi_device *spi = priv->spi; | |
304 | struct spi_transfer x[2] = { { .tx_dma = 0, }, }; | |
305 | struct spi_message msg; | |
306 | unsigned int pageaddr, addr, offset, writelen; | |
307 | size_t remaining = len; | |
308 | u_char *writebuf = (u_char *) buf; | |
309 | int status = -EINVAL; | |
310 | u8 *command; | |
311 | ||
312 | DEBUG(MTD_DEBUG_LEVEL2, "%s: write 0x%x..0x%x\n", | |
313 | spi->dev.bus_id, (unsigned)to, (unsigned)(to + len)); | |
314 | ||
315 | *retlen = 0; | |
316 | ||
317 | /* Sanity checks */ | |
318 | if (!len) | |
319 | return 0; | |
320 | if ((to + len) > mtd->size) | |
321 | return -EINVAL; | |
322 | ||
323 | x[0].tx_buf = command = priv->command; | |
324 | x[0].len = 4; | |
325 | msg.transfers = x; | |
326 | ||
327 | pageaddr = ((unsigned)to / priv->page_size); | |
328 | offset = ((unsigned)to % priv->page_size); | |
329 | if (offset + len > priv->page_size) | |
330 | writelen = priv->page_size - offset; | |
331 | else | |
332 | writelen = len; | |
333 | ||
334 | down(&priv->lock); | |
335 | while (remaining > 0) { | |
336 | DEBUG(MTD_DEBUG_LEVEL3, "write @ %i:%i len=%i\n", | |
337 | pageaddr, offset, writelen); | |
338 | ||
339 | /* REVISIT: | |
340 | * (a) each page in a sector must be rewritten at least | |
341 | * once every 10K sibling erase/program operations. | |
342 | * (b) for pages that are already erased, we could | |
343 | * use WRITE+MWRITE not PROGRAM for ~30% speedup. | |
344 | * (c) WRITE to buffer could be done while waiting for | |
345 | * a previous MWRITE/MWERASE to complete ... | |
346 | * (d) error handling here seems to be mostly missing. | |
347 | * | |
348 | * Two persistent bits per page, plus a per-sector counter, | |
349 | * could support (a) and (b) ... we might consider using | |
350 | * the second half of sector zero, which is just one block, | |
351 | * to track that state. (On AT91, that sector should also | |
352 | * support boot-from-DataFlash.) | |
353 | */ | |
354 | ||
355 | addr = pageaddr << priv->page_offset; | |
356 | ||
357 | /* (1) Maybe transfer partial page to Buffer1 */ | |
358 | if (writelen != priv->page_size) { | |
359 | command[0] = OP_TRANSFER_BUF1; | |
360 | command[1] = (addr & 0x00FF0000) >> 16; | |
361 | command[2] = (addr & 0x0000FF00) >> 8; | |
362 | command[3] = 0; | |
363 | ||
364 | DEBUG(MTD_DEBUG_LEVEL3, "TRANSFER: (%x) %x %x %x\n", | |
365 | command[0], command[1], command[2], command[3]); | |
366 | ||
367 | msg.n_transfer = 1; | |
368 | status = spi_sync(spi, &msg); | |
369 | if (status < 0) | |
370 | DEBUG(MTD_DEBUG_LEVEL1, "%s: xfer %u -> %d \n", | |
371 | spi->dev.bus_id, addr, status); | |
372 | ||
373 | (void) dataflash_waitready(priv->spi); | |
374 | } | |
375 | ||
376 | /* (2) Program full page via Buffer1 */ | |
377 | addr += offset; | |
378 | command[0] = OP_PROGRAM_VIA_BUF1; | |
379 | command[1] = (addr & 0x00FF0000) >> 16; | |
380 | command[2] = (addr & 0x0000FF00) >> 8; | |
381 | command[3] = (addr & 0x000000FF); | |
382 | ||
383 | DEBUG(MTD_DEBUG_LEVEL3, "PROGRAM: (%x) %x %x %x\n", | |
384 | command[0], command[1], command[2], command[3]); | |
385 | ||
386 | x[1].tx_buf = writebuf; | |
387 | x[1].len = writelen; | |
388 | msg.n_transfer = 2; | |
389 | status = spi_sync(spi, &msg); | |
390 | if (status < 0) | |
391 | DEBUG(MTD_DEBUG_LEVEL1, "%s: pgm %u/%u -> %d \n", | |
392 | spi->dev.bus_id, addr, writelen, status); | |
393 | ||
394 | (void) dataflash_waitready(priv->spi); | |
395 | ||
396 | #ifdef CONFIG_DATAFLASH_WRITE_VERIFY | |
397 | ||
398 | /* (3) Compare to Buffer1 */ | |
399 | addr = pageaddr << priv->page_offset; | |
400 | command[0] = OP_COMPARE_BUF1; | |
401 | command[1] = (addr & 0x00FF0000) >> 16; | |
402 | command[2] = (addr & 0x0000FF00) >> 8; | |
403 | command[3] = 0; | |
404 | ||
405 | DEBUG(MTD_DEBUG_LEVEL3, "COMPARE: (%x) %x %x %x\n", | |
406 | command[0], command[1], command[2], command[3]); | |
407 | ||
408 | msg.n_transfer = 1; | |
409 | status = spi_sync(spi, &msg); | |
410 | if (status < 0) | |
411 | DEBUG(MTD_DEBUG_LEVEL1, "%s: compare %u -> %d \n", | |
412 | spi->dev.bus_id, addr, status); | |
413 | ||
414 | status = dataflash_waitready(priv->spi); | |
415 | ||
416 | /* Check result of the compare operation */ | |
417 | if ((status & (1 << 6)) == 1) { | |
418 | printk(KERN_ERR "%s: compare page %u, err %d\n", | |
419 | spi->dev.bus_id, pageaddr, status); | |
420 | remaining = 0; | |
421 | status = -EIO; | |
422 | break; | |
423 | } else | |
424 | status = 0; | |
425 | ||
426 | #endif /* CONFIG_DATAFLASH_WRITE_VERIFY */ | |
427 | ||
428 | remaining = remaining - writelen; | |
429 | pageaddr++; | |
430 | offset = 0; | |
431 | writebuf += writelen; | |
432 | *retlen += writelen; | |
433 | ||
434 | if (remaining > priv->page_size) | |
435 | writelen = priv->page_size; | |
436 | else | |
437 | writelen = remaining; | |
438 | } | |
439 | up(&priv->lock); | |
440 | ||
441 | return status; | |
442 | } | |
443 | ||
444 | /* ......................................................................... */ | |
445 | ||
446 | /* | |
447 | * Register DataFlash device with MTD subsystem. | |
448 | */ | |
449 | static int __devinit | |
450 | add_dataflash(struct spi_device *spi, char *name, | |
451 | int nr_pages, int pagesize, int pageoffset) | |
452 | { | |
453 | struct dataflash *priv; | |
454 | struct mtd_info *device; | |
455 | struct flash_platform_data *pdata = spi->dev.platform_data; | |
456 | ||
457 | priv = (struct dataflash *) kzalloc(sizeof *priv, GFP_KERNEL); | |
458 | if (!priv) | |
459 | return -ENOMEM; | |
460 | ||
461 | init_MUTEX(&priv->lock); | |
462 | priv->spi = spi; | |
463 | priv->page_size = pagesize; | |
464 | priv->page_offset = pageoffset; | |
465 | ||
466 | /* name must be usable with cmdlinepart */ | |
467 | sprintf(priv->name, "spi%d.%d-%s", | |
468 | spi->master->bus_num, spi->chip_select, | |
469 | name); | |
470 | ||
471 | device = &priv->mtd; | |
472 | device->name = (pdata && pdata->name) ? pdata->name : priv->name; | |
473 | device->size = nr_pages * pagesize; | |
474 | device->erasesize = pagesize; | |
475 | device->owner = THIS_MODULE; | |
476 | device->type = MTD_DATAFLASH; | |
477 | device->flags = MTD_CAP_NORFLASH; | |
478 | device->erase = dataflash_erase; | |
479 | device->read = dataflash_read; | |
480 | device->write = dataflash_write; | |
481 | device->priv = priv; | |
482 | ||
483 | dev_info(&spi->dev, "%s (%d KBytes)\n", name, device->size/1024); | |
484 | dev_set_drvdata(&spi->dev, priv); | |
485 | ||
486 | if (mtd_has_partitions()) { | |
487 | struct mtd_partition *parts; | |
488 | int nr_parts = 0; | |
489 | ||
490 | #ifdef CONFIG_MTD_CMDLINE_PARTS | |
491 | static const char *part_probes[] = { "cmdlinepart", NULL, }; | |
492 | ||
493 | nr_parts = parse_mtd_partitions(device, part_probes, &parts, 0); | |
494 | #endif | |
495 | ||
496 | if (nr_parts <= 0 && pdata && pdata->parts) { | |
497 | parts = pdata->parts; | |
498 | nr_parts = pdata->nr_parts; | |
499 | } | |
500 | ||
501 | if (nr_parts > 0) { | |
502 | priv->partitioned = 1; | |
503 | return add_mtd_partitions(device, parts, nr_parts); | |
504 | } | |
505 | } else if (pdata->nr_parts) | |
506 | dev_warn(&spi->dev, "ignoring %d default partitions on %s\n", | |
507 | pdata->nr_parts, device->name); | |
508 | ||
509 | return add_mtd_device(device) == 1 ? -ENODEV : 0; | |
510 | } | |
511 | ||
512 | /* | |
513 | * Detect and initialize DataFlash device: | |
514 | * | |
515 | * Device Density ID code #Pages PageSize Offset | |
516 | * AT45DB011B 1Mbit (128K) xx0011xx (0x0c) 512 264 9 | |
517 | * AT45DB021B 2Mbit (256K) xx0101xx (0x14) 1025 264 9 | |
518 | * AT45DB041B 4Mbit (512K) xx0111xx (0x1c) 2048 264 9 | |
519 | * AT45DB081B 8Mbit (1M) xx1001xx (0x24) 4096 264 9 | |
520 | * AT45DB0161B 16Mbit (2M) xx1011xx (0x2c) 4096 528 10 | |
521 | * AT45DB0321B 32Mbit (4M) xx1101xx (0x34) 8192 528 10 | |
522 | * AT45DB0642 64Mbit (8M) xx111xxx (0x3c) 8192 1056 11 | |
523 | * AT45DB1282 128Mbit (16M) xx0100xx (0x10) 16384 1056 11 | |
524 | */ | |
525 | static int __devinit dataflash_probe(struct spi_device *spi) | |
526 | { | |
527 | int status; | |
528 | ||
529 | status = dataflash_status(spi); | |
530 | if (status <= 0 || status == 0xff) { | |
531 | DEBUG(MTD_DEBUG_LEVEL1, "%s: status error %d\n", | |
532 | spi->dev.bus_id, status); | |
533 | if (status == 0xff) | |
534 | status = -ENODEV; | |
535 | return status; | |
536 | } | |
537 | ||
538 | /* if there's a device there, assume it's dataflash. | |
539 | * board setup should have set spi->max_speed_max to | |
540 | * match f(car) for continuous reads, mode 0 or 3. | |
541 | */ | |
542 | switch (status & 0x3c) { | |
543 | case 0x0c: /* 0 0 1 1 x x */ | |
544 | status = add_dataflash(spi, "AT45DB011B", 512, 264, 9); | |
545 | break; | |
546 | case 0x14: /* 0 1 0 1 x x */ | |
547 | status = add_dataflash(spi, "AT45DB021B", 1025, 264, 9); | |
548 | break; | |
549 | case 0x1c: /* 0 1 1 1 x x */ | |
550 | status = add_dataflash(spi, "AT45DB041x", 2048, 264, 9); | |
551 | break; | |
552 | case 0x24: /* 1 0 0 1 x x */ | |
553 | status = add_dataflash(spi, "AT45DB081B", 4096, 264, 9); | |
554 | break; | |
555 | case 0x2c: /* 1 0 1 1 x x */ | |
556 | status = add_dataflash(spi, "AT45DB161x", 4096, 528, 10); | |
557 | break; | |
558 | case 0x34: /* 1 1 0 1 x x */ | |
559 | status = add_dataflash(spi, "AT45DB321x", 8192, 528, 10); | |
560 | break; | |
561 | case 0x38: /* 1 1 1 x x x */ | |
562 | case 0x3c: | |
563 | status = add_dataflash(spi, "AT45DB642x", 8192, 1056, 11); | |
564 | break; | |
565 | /* obsolete AT45DB1282 not (yet?) supported */ | |
566 | default: | |
567 | DEBUG(MTD_DEBUG_LEVEL1, "%s: unsupported device (%x)\n", | |
568 | spi->dev.bus_id, status & 0x3c); | |
569 | status = -ENODEV; | |
570 | } | |
571 | ||
572 | if (status < 0) | |
573 | DEBUG(MTD_DEBUG_LEVEL1, "%s: add_dataflash --> %d\n", | |
574 | spi->dev.bus_id, status); | |
575 | ||
576 | return status; | |
577 | } | |
578 | ||
579 | static int __devexit dataflash_remove(struct spi_device *spi) | |
580 | { | |
581 | struct dataflash *flash = dev_get_drvdata(&spi->dev); | |
582 | int status; | |
583 | ||
584 | DEBUG(MTD_DEBUG_LEVEL1, "%s: remove\n", spi->dev.bus_id); | |
585 | ||
586 | if (mtd_has_partitions() && flash->partitioned) | |
587 | status = del_mtd_partitions(&flash->mtd); | |
588 | else | |
589 | status = del_mtd_device(&flash->mtd); | |
590 | if (status == 0) | |
591 | kfree(flash); | |
592 | return status; | |
593 | } | |
594 | ||
595 | static struct spi_driver dataflash_driver = { | |
596 | .driver = { | |
597 | .name = "mtd_dataflash", | |
598 | .bus = &spi_bus_type, | |
599 | .owner = THIS_MODULE, | |
600 | }, | |
601 | ||
602 | .probe = dataflash_probe, | |
603 | .remove = __devexit_p(dataflash_remove), | |
604 | ||
605 | /* FIXME: investigate suspend and resume... */ | |
606 | }; | |
607 | ||
608 | static int __init dataflash_init(void) | |
609 | { | |
610 | return spi_register_driver(&dataflash_driver); | |
611 | } | |
612 | module_init(dataflash_init); | |
613 | ||
614 | static void __exit dataflash_exit(void) | |
615 | { | |
616 | spi_unregister_driver(&dataflash_driver); | |
617 | } | |
618 | module_exit(dataflash_exit); | |
619 | ||
620 | ||
621 | MODULE_LICENSE("GPL"); | |
622 | MODULE_AUTHOR("Andrew Victor, David Brownell"); | |
623 | MODULE_DESCRIPTION("MTD DataFlash driver"); |