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Commit | Line | Data |
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2f9f7628 | 1 | /* |
fa0a8c71 | 2 | * MTD SPI driver for ST M25Pxx (and similar) serial flash chips |
2f9f7628 ML |
3 | * |
4 | * Author: Mike Lavender, mike@steroidmicros.com | |
5 | * | |
6 | * Copyright (c) 2005, Intec Automation Inc. | |
7 | * | |
8 | * Some parts are based on lart.c by Abraham Van Der Merwe | |
9 | * | |
10 | * Cleaned up and generalized based on mtd_dataflash.c | |
11 | * | |
12 | * This code is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License version 2 as | |
14 | * published by the Free Software Foundation. | |
15 | * | |
16 | */ | |
17 | ||
18 | #include <linux/init.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/device.h> | |
21 | #include <linux/interrupt.h> | |
7d5230ea DB |
22 | #include <linux/mutex.h> |
23 | ||
2f9f7628 ML |
24 | #include <linux/mtd/mtd.h> |
25 | #include <linux/mtd/partitions.h> | |
7d5230ea | 26 | |
2f9f7628 ML |
27 | #include <linux/spi/spi.h> |
28 | #include <linux/spi/flash.h> | |
29 | ||
2f9f7628 | 30 | |
2f9f7628 ML |
31 | #define FLASH_PAGESIZE 256 |
32 | ||
33 | /* Flash opcodes. */ | |
fa0a8c71 DB |
34 | #define OPCODE_WREN 0x06 /* Write enable */ |
35 | #define OPCODE_RDSR 0x05 /* Read status register */ | |
72289824 | 36 | #define OPCODE_WRSR 0x01 /* Write status register 1 byte */ |
2230b76b | 37 | #define OPCODE_NORM_READ 0x03 /* Read data bytes (low frequency) */ |
fa0a8c71 DB |
38 | #define OPCODE_FAST_READ 0x0b /* Read data bytes (high frequency) */ |
39 | #define OPCODE_PP 0x02 /* Page program (up to 256 bytes) */ | |
02d087db DW |
40 | #define OPCODE_BE_4K 0x20 /* Erase 4KiB block */ |
41 | #define OPCODE_BE_32K 0x52 /* Erase 32KiB block */ | |
faff3750 | 42 | #define OPCODE_BE 0xc7 /* Erase whole flash block */ |
02d087db | 43 | #define OPCODE_SE 0xd8 /* Sector erase (usually 64KiB) */ |
2f9f7628 ML |
44 | #define OPCODE_RDID 0x9f /* Read JEDEC ID */ |
45 | ||
46 | /* Status Register bits. */ | |
47 | #define SR_WIP 1 /* Write in progress */ | |
48 | #define SR_WEL 2 /* Write enable latch */ | |
fa0a8c71 | 49 | /* meaning of other SR_* bits may differ between vendors */ |
2f9f7628 ML |
50 | #define SR_BP0 4 /* Block protect 0 */ |
51 | #define SR_BP1 8 /* Block protect 1 */ | |
52 | #define SR_BP2 0x10 /* Block protect 2 */ | |
53 | #define SR_SRWD 0x80 /* SR write protect */ | |
54 | ||
55 | /* Define max times to check status register before we give up. */ | |
56 | #define MAX_READY_WAIT_COUNT 100000 | |
2230b76b | 57 | #define CMD_SIZE 4 |
2f9f7628 | 58 | |
2230b76b BW |
59 | #ifdef CONFIG_M25PXX_USE_FAST_READ |
60 | #define OPCODE_READ OPCODE_FAST_READ | |
61 | #define FAST_READ_DUMMY_BYTE 1 | |
62 | #else | |
63 | #define OPCODE_READ OPCODE_NORM_READ | |
64 | #define FAST_READ_DUMMY_BYTE 0 | |
65 | #endif | |
2f9f7628 ML |
66 | |
67 | #ifdef CONFIG_MTD_PARTITIONS | |
68 | #define mtd_has_partitions() (1) | |
69 | #else | |
70 | #define mtd_has_partitions() (0) | |
71 | #endif | |
72 | ||
73 | /****************************************************************************/ | |
74 | ||
75 | struct m25p { | |
76 | struct spi_device *spi; | |
7d5230ea | 77 | struct mutex lock; |
2f9f7628 | 78 | struct mtd_info mtd; |
fa0a8c71 DB |
79 | unsigned partitioned:1; |
80 | u8 erase_opcode; | |
2230b76b | 81 | u8 command[CMD_SIZE + FAST_READ_DUMMY_BYTE]; |
2f9f7628 ML |
82 | }; |
83 | ||
84 | static inline struct m25p *mtd_to_m25p(struct mtd_info *mtd) | |
85 | { | |
86 | return container_of(mtd, struct m25p, mtd); | |
87 | } | |
88 | ||
89 | /****************************************************************************/ | |
90 | ||
91 | /* | |
92 | * Internal helper functions | |
93 | */ | |
94 | ||
95 | /* | |
96 | * Read the status register, returning its value in the location | |
97 | * Return the status register value. | |
98 | * Returns negative if error occurred. | |
99 | */ | |
100 | static int read_sr(struct m25p *flash) | |
101 | { | |
102 | ssize_t retval; | |
103 | u8 code = OPCODE_RDSR; | |
104 | u8 val; | |
105 | ||
106 | retval = spi_write_then_read(flash->spi, &code, 1, &val, 1); | |
107 | ||
108 | if (retval < 0) { | |
109 | dev_err(&flash->spi->dev, "error %d reading SR\n", | |
110 | (int) retval); | |
111 | return retval; | |
112 | } | |
113 | ||
114 | return val; | |
115 | } | |
116 | ||
72289824 MH |
117 | /* |
118 | * Write status register 1 byte | |
119 | * Returns negative if error occurred. | |
120 | */ | |
121 | static int write_sr(struct m25p *flash, u8 val) | |
122 | { | |
123 | flash->command[0] = OPCODE_WRSR; | |
124 | flash->command[1] = val; | |
125 | ||
126 | return spi_write(flash->spi, flash->command, 2); | |
127 | } | |
2f9f7628 ML |
128 | |
129 | /* | |
130 | * Set write enable latch with Write Enable command. | |
131 | * Returns negative if error occurred. | |
132 | */ | |
133 | static inline int write_enable(struct m25p *flash) | |
134 | { | |
135 | u8 code = OPCODE_WREN; | |
136 | ||
8a1a6272 | 137 | return spi_write_then_read(flash->spi, &code, 1, NULL, 0); |
2f9f7628 ML |
138 | } |
139 | ||
140 | ||
141 | /* | |
142 | * Service routine to read status register until ready, or timeout occurs. | |
143 | * Returns non-zero if error. | |
144 | */ | |
145 | static int wait_till_ready(struct m25p *flash) | |
146 | { | |
147 | int count; | |
148 | int sr; | |
149 | ||
150 | /* one chip guarantees max 5 msec wait here after page writes, | |
151 | * but potentially three seconds (!) after page erase. | |
152 | */ | |
153 | for (count = 0; count < MAX_READY_WAIT_COUNT; count++) { | |
154 | if ((sr = read_sr(flash)) < 0) | |
155 | break; | |
156 | else if (!(sr & SR_WIP)) | |
157 | return 0; | |
158 | ||
159 | /* REVISIT sometimes sleeping would be best */ | |
160 | } | |
161 | ||
162 | return 1; | |
163 | } | |
164 | ||
faff3750 CG |
165 | /* |
166 | * Erase the whole flash memory | |
167 | * | |
168 | * Returns 0 if successful, non-zero otherwise. | |
169 | */ | |
170 | static int erase_block(struct m25p *flash) | |
171 | { | |
172 | DEBUG(MTD_DEBUG_LEVEL3, "%s: %s %dKiB\n", | |
173 | flash->spi->dev.bus_id, __func__, | |
174 | flash->mtd.size / 1024); | |
175 | ||
176 | /* Wait until finished previous write command. */ | |
177 | if (wait_till_ready(flash)) | |
178 | return 1; | |
179 | ||
180 | /* Send write enable, then erase commands. */ | |
181 | write_enable(flash); | |
182 | ||
183 | /* Set up command buffer. */ | |
184 | flash->command[0] = OPCODE_BE; | |
185 | ||
186 | spi_write(flash->spi, flash->command, 1); | |
187 | ||
188 | return 0; | |
189 | } | |
2f9f7628 ML |
190 | |
191 | /* | |
192 | * Erase one sector of flash memory at offset ``offset'' which is any | |
193 | * address within the sector which should be erased. | |
194 | * | |
195 | * Returns 0 if successful, non-zero otherwise. | |
196 | */ | |
197 | static int erase_sector(struct m25p *flash, u32 offset) | |
198 | { | |
02d087db | 199 | DEBUG(MTD_DEBUG_LEVEL3, "%s: %s %dKiB at 0x%08x\n", |
cb53b3b9 | 200 | flash->spi->dev.bus_id, __func__, |
fa0a8c71 | 201 | flash->mtd.erasesize / 1024, offset); |
2f9f7628 ML |
202 | |
203 | /* Wait until finished previous write command. */ | |
204 | if (wait_till_ready(flash)) | |
205 | return 1; | |
206 | ||
207 | /* Send write enable, then erase commands. */ | |
208 | write_enable(flash); | |
209 | ||
210 | /* Set up command buffer. */ | |
fa0a8c71 | 211 | flash->command[0] = flash->erase_opcode; |
2f9f7628 ML |
212 | flash->command[1] = offset >> 16; |
213 | flash->command[2] = offset >> 8; | |
214 | flash->command[3] = offset; | |
215 | ||
2230b76b | 216 | spi_write(flash->spi, flash->command, CMD_SIZE); |
2f9f7628 ML |
217 | |
218 | return 0; | |
219 | } | |
220 | ||
221 | /****************************************************************************/ | |
222 | ||
223 | /* | |
224 | * MTD implementation | |
225 | */ | |
226 | ||
227 | /* | |
228 | * Erase an address range on the flash chip. The address range may extend | |
229 | * one or more erase sectors. Return an error is there is a problem erasing. | |
230 | */ | |
231 | static int m25p80_erase(struct mtd_info *mtd, struct erase_info *instr) | |
232 | { | |
233 | struct m25p *flash = mtd_to_m25p(mtd); | |
234 | u32 addr,len; | |
235 | ||
19676ff0 | 236 | DEBUG(MTD_DEBUG_LEVEL2, "%s: %s %s 0x%08x, len %d\n", |
cb53b3b9 | 237 | flash->spi->dev.bus_id, __func__, "at", |
2f9f7628 ML |
238 | (u32)instr->addr, instr->len); |
239 | ||
240 | /* sanity checks */ | |
241 | if (instr->addr + instr->len > flash->mtd.size) | |
242 | return -EINVAL; | |
243 | if ((instr->addr % mtd->erasesize) != 0 | |
244 | || (instr->len % mtd->erasesize) != 0) { | |
245 | return -EINVAL; | |
246 | } | |
247 | ||
248 | addr = instr->addr; | |
249 | len = instr->len; | |
250 | ||
7d5230ea | 251 | mutex_lock(&flash->lock); |
2f9f7628 | 252 | |
fa0a8c71 DB |
253 | /* REVISIT in some cases we could speed up erasing large regions |
254 | * by using OPCODE_SE instead of OPCODE_BE_4K | |
255 | */ | |
256 | ||
2f9f7628 | 257 | /* now erase those sectors */ |
faff3750 CG |
258 | if (len == flash->mtd.size && erase_block(flash)) { |
259 | instr->state = MTD_ERASE_FAILED; | |
260 | mutex_unlock(&flash->lock); | |
261 | return -EIO; | |
262 | } else { | |
263 | while (len) { | |
264 | if (erase_sector(flash, addr)) { | |
265 | instr->state = MTD_ERASE_FAILED; | |
266 | mutex_unlock(&flash->lock); | |
267 | return -EIO; | |
268 | } | |
269 | ||
270 | addr += mtd->erasesize; | |
271 | len -= mtd->erasesize; | |
2f9f7628 | 272 | } |
2f9f7628 ML |
273 | } |
274 | ||
7d5230ea | 275 | mutex_unlock(&flash->lock); |
2f9f7628 ML |
276 | |
277 | instr->state = MTD_ERASE_DONE; | |
278 | mtd_erase_callback(instr); | |
279 | ||
280 | return 0; | |
281 | } | |
282 | ||
283 | /* | |
284 | * Read an address range from the flash chip. The address range | |
285 | * may be any size provided it is within the physical boundaries. | |
286 | */ | |
287 | static int m25p80_read(struct mtd_info *mtd, loff_t from, size_t len, | |
288 | size_t *retlen, u_char *buf) | |
289 | { | |
290 | struct m25p *flash = mtd_to_m25p(mtd); | |
291 | struct spi_transfer t[2]; | |
292 | struct spi_message m; | |
293 | ||
294 | DEBUG(MTD_DEBUG_LEVEL2, "%s: %s %s 0x%08x, len %zd\n", | |
cb53b3b9 | 295 | flash->spi->dev.bus_id, __func__, "from", |
2f9f7628 ML |
296 | (u32)from, len); |
297 | ||
298 | /* sanity checks */ | |
299 | if (!len) | |
300 | return 0; | |
301 | ||
302 | if (from + len > flash->mtd.size) | |
303 | return -EINVAL; | |
304 | ||
8275c642 VW |
305 | spi_message_init(&m); |
306 | memset(t, 0, (sizeof t)); | |
307 | ||
2230b76b BW |
308 | /* NOTE: |
309 | * OPCODE_FAST_READ (if available) is faster. | |
310 | * Should add 1 byte DUMMY_BYTE. | |
311 | */ | |
8275c642 | 312 | t[0].tx_buf = flash->command; |
2230b76b | 313 | t[0].len = CMD_SIZE + FAST_READ_DUMMY_BYTE; |
8275c642 VW |
314 | spi_message_add_tail(&t[0], &m); |
315 | ||
316 | t[1].rx_buf = buf; | |
317 | t[1].len = len; | |
318 | spi_message_add_tail(&t[1], &m); | |
319 | ||
320 | /* Byte count starts at zero. */ | |
321 | if (retlen) | |
322 | *retlen = 0; | |
323 | ||
7d5230ea | 324 | mutex_lock(&flash->lock); |
2f9f7628 ML |
325 | |
326 | /* Wait till previous write/erase is done. */ | |
327 | if (wait_till_ready(flash)) { | |
328 | /* REVISIT status return?? */ | |
7d5230ea | 329 | mutex_unlock(&flash->lock); |
2f9f7628 ML |
330 | return 1; |
331 | } | |
332 | ||
fa0a8c71 DB |
333 | /* FIXME switch to OPCODE_FAST_READ. It's required for higher |
334 | * clocks; and at this writing, every chip this driver handles | |
335 | * supports that opcode. | |
336 | */ | |
2f9f7628 ML |
337 | |
338 | /* Set up the write data buffer. */ | |
339 | flash->command[0] = OPCODE_READ; | |
340 | flash->command[1] = from >> 16; | |
341 | flash->command[2] = from >> 8; | |
342 | flash->command[3] = from; | |
343 | ||
2f9f7628 ML |
344 | spi_sync(flash->spi, &m); |
345 | ||
2230b76b | 346 | *retlen = m.actual_length - CMD_SIZE - FAST_READ_DUMMY_BYTE; |
2f9f7628 | 347 | |
7d5230ea | 348 | mutex_unlock(&flash->lock); |
2f9f7628 ML |
349 | |
350 | return 0; | |
351 | } | |
352 | ||
353 | /* | |
354 | * Write an address range to the flash chip. Data must be written in | |
355 | * FLASH_PAGESIZE chunks. The address range may be any size provided | |
356 | * it is within the physical boundaries. | |
357 | */ | |
358 | static int m25p80_write(struct mtd_info *mtd, loff_t to, size_t len, | |
359 | size_t *retlen, const u_char *buf) | |
360 | { | |
361 | struct m25p *flash = mtd_to_m25p(mtd); | |
362 | u32 page_offset, page_size; | |
363 | struct spi_transfer t[2]; | |
364 | struct spi_message m; | |
365 | ||
366 | DEBUG(MTD_DEBUG_LEVEL2, "%s: %s %s 0x%08x, len %zd\n", | |
cb53b3b9 | 367 | flash->spi->dev.bus_id, __func__, "to", |
2f9f7628 ML |
368 | (u32)to, len); |
369 | ||
370 | if (retlen) | |
371 | *retlen = 0; | |
372 | ||
373 | /* sanity checks */ | |
374 | if (!len) | |
375 | return(0); | |
376 | ||
377 | if (to + len > flash->mtd.size) | |
378 | return -EINVAL; | |
379 | ||
8275c642 VW |
380 | spi_message_init(&m); |
381 | memset(t, 0, (sizeof t)); | |
382 | ||
383 | t[0].tx_buf = flash->command; | |
2230b76b | 384 | t[0].len = CMD_SIZE; |
8275c642 VW |
385 | spi_message_add_tail(&t[0], &m); |
386 | ||
387 | t[1].tx_buf = buf; | |
388 | spi_message_add_tail(&t[1], &m); | |
389 | ||
7d5230ea | 390 | mutex_lock(&flash->lock); |
2f9f7628 ML |
391 | |
392 | /* Wait until finished previous write command. */ | |
bc018863 CG |
393 | if (wait_till_ready(flash)) { |
394 | mutex_unlock(&flash->lock); | |
2f9f7628 | 395 | return 1; |
bc018863 | 396 | } |
2f9f7628 ML |
397 | |
398 | write_enable(flash); | |
399 | ||
2f9f7628 ML |
400 | /* Set up the opcode in the write buffer. */ |
401 | flash->command[0] = OPCODE_PP; | |
402 | flash->command[1] = to >> 16; | |
403 | flash->command[2] = to >> 8; | |
404 | flash->command[3] = to; | |
405 | ||
2f9f7628 ML |
406 | /* what page do we start with? */ |
407 | page_offset = to % FLASH_PAGESIZE; | |
408 | ||
409 | /* do all the bytes fit onto one page? */ | |
410 | if (page_offset + len <= FLASH_PAGESIZE) { | |
2f9f7628 ML |
411 | t[1].len = len; |
412 | ||
413 | spi_sync(flash->spi, &m); | |
414 | ||
2230b76b | 415 | *retlen = m.actual_length - CMD_SIZE; |
2f9f7628 ML |
416 | } else { |
417 | u32 i; | |
418 | ||
419 | /* the size of data remaining on the first page */ | |
420 | page_size = FLASH_PAGESIZE - page_offset; | |
421 | ||
2f9f7628 ML |
422 | t[1].len = page_size; |
423 | spi_sync(flash->spi, &m); | |
424 | ||
2230b76b | 425 | *retlen = m.actual_length - CMD_SIZE; |
2f9f7628 ML |
426 | |
427 | /* write everything in PAGESIZE chunks */ | |
428 | for (i = page_size; i < len; i += page_size) { | |
429 | page_size = len - i; | |
430 | if (page_size > FLASH_PAGESIZE) | |
431 | page_size = FLASH_PAGESIZE; | |
432 | ||
433 | /* write the next page to flash */ | |
434 | flash->command[1] = (to + i) >> 16; | |
435 | flash->command[2] = (to + i) >> 8; | |
436 | flash->command[3] = (to + i); | |
437 | ||
438 | t[1].tx_buf = buf + i; | |
439 | t[1].len = page_size; | |
440 | ||
441 | wait_till_ready(flash); | |
442 | ||
443 | write_enable(flash); | |
444 | ||
445 | spi_sync(flash->spi, &m); | |
446 | ||
7111763d | 447 | if (retlen) |
2230b76b | 448 | *retlen += m.actual_length - CMD_SIZE; |
7d5230ea DB |
449 | } |
450 | } | |
2f9f7628 | 451 | |
7d5230ea | 452 | mutex_unlock(&flash->lock); |
2f9f7628 ML |
453 | |
454 | return 0; | |
455 | } | |
456 | ||
457 | ||
458 | /****************************************************************************/ | |
459 | ||
460 | /* | |
461 | * SPI device driver setup and teardown | |
462 | */ | |
463 | ||
464 | struct flash_info { | |
465 | char *name; | |
fa0a8c71 DB |
466 | |
467 | /* JEDEC id zero means "no ID" (most older chips); otherwise it has | |
468 | * a high byte of zero plus three data bytes: the manufacturer id, | |
469 | * then a two byte device id. | |
470 | */ | |
471 | u32 jedec_id; | |
d0e8c47c | 472 | u16 ext_id; |
fa0a8c71 DB |
473 | |
474 | /* The size listed here is what works with OPCODE_SE, which isn't | |
475 | * necessarily called a "sector" by the vendor. | |
476 | */ | |
2f9f7628 | 477 | unsigned sector_size; |
fa0a8c71 DB |
478 | u16 n_sectors; |
479 | ||
480 | u16 flags; | |
481 | #define SECT_4K 0x01 /* OPCODE_BE_4K works uniformly */ | |
2f9f7628 ML |
482 | }; |
483 | ||
fa0a8c71 DB |
484 | |
485 | /* NOTE: double check command sets and memory organization when you add | |
486 | * more flash chips. This current list focusses on newer chips, which | |
487 | * have been converging on command sets which including JEDEC ID. | |
488 | */ | |
2f9f7628 | 489 | static struct flash_info __devinitdata m25p_data [] = { |
fa0a8c71 DB |
490 | |
491 | /* Atmel -- some are (confusingly) marketed as "DataFlash" */ | |
d0e8c47c CG |
492 | { "at25fs010", 0x1f6601, 0, 32 * 1024, 4, SECT_4K, }, |
493 | { "at25fs040", 0x1f6604, 0, 64 * 1024, 8, SECT_4K, }, | |
fa0a8c71 | 494 | |
d0e8c47c CG |
495 | { "at25df041a", 0x1f4401, 0, 64 * 1024, 8, SECT_4K, }, |
496 | { "at25df641", 0x1f4800, 0, 64 * 1024, 128, SECT_4K, }, | |
fa0a8c71 | 497 | |
d0e8c47c CG |
498 | { "at26f004", 0x1f0400, 0, 64 * 1024, 8, SECT_4K, }, |
499 | { "at26df081a", 0x1f4501, 0, 64 * 1024, 16, SECT_4K, }, | |
500 | { "at26df161a", 0x1f4601, 0, 64 * 1024, 32, SECT_4K, }, | |
501 | { "at26df321", 0x1f4701, 0, 64 * 1024, 64, SECT_4K, }, | |
fa0a8c71 DB |
502 | |
503 | /* Spansion -- single (large) sector size only, at least | |
504 | * for the chips listed here (without boot sectors). | |
505 | */ | |
d0e8c47c CG |
506 | { "s25sl004a", 0x010212, 0, 64 * 1024, 8, }, |
507 | { "s25sl008a", 0x010213, 0, 64 * 1024, 16, }, | |
508 | { "s25sl016a", 0x010214, 0, 64 * 1024, 32, }, | |
509 | { "s25sl032a", 0x010215, 0, 64 * 1024, 64, }, | |
510 | { "s25sl064a", 0x010216, 0, 64 * 1024, 128, }, | |
511 | { "s25sl12800", 0x012018, 0x0300, 256 * 1024, 64, }, | |
512 | { "s25sl12801", 0x012018, 0x0301, 64 * 1024, 256, }, | |
fa0a8c71 DB |
513 | |
514 | /* SST -- large erase sizes are "overlays", "sectors" are 4K */ | |
d0e8c47c CG |
515 | { "sst25vf040b", 0xbf258d, 0, 64 * 1024, 8, SECT_4K, }, |
516 | { "sst25vf080b", 0xbf258e, 0, 64 * 1024, 16, SECT_4K, }, | |
517 | { "sst25vf016b", 0xbf2541, 0, 64 * 1024, 32, SECT_4K, }, | |
518 | { "sst25vf032b", 0xbf254a, 0, 64 * 1024, 64, SECT_4K, }, | |
fa0a8c71 DB |
519 | |
520 | /* ST Microelectronics -- newer production may have feature updates */ | |
d0e8c47c CG |
521 | { "m25p05", 0x202010, 0, 32 * 1024, 2, }, |
522 | { "m25p10", 0x202011, 0, 32 * 1024, 4, }, | |
523 | { "m25p20", 0x202012, 0, 64 * 1024, 4, }, | |
524 | { "m25p40", 0x202013, 0, 64 * 1024, 8, }, | |
525 | { "m25p80", 0, 0, 64 * 1024, 16, }, | |
526 | { "m25p16", 0x202015, 0, 64 * 1024, 32, }, | |
527 | { "m25p32", 0x202016, 0, 64 * 1024, 64, }, | |
528 | { "m25p64", 0x202017, 0, 64 * 1024, 128, }, | |
529 | { "m25p128", 0x202018, 0, 256 * 1024, 64, }, | |
530 | ||
531 | { "m45pe80", 0x204014, 0, 64 * 1024, 16, }, | |
532 | { "m45pe16", 0x204015, 0, 64 * 1024, 32, }, | |
533 | ||
534 | { "m25pe80", 0x208014, 0, 64 * 1024, 16, }, | |
535 | { "m25pe16", 0x208015, 0, 64 * 1024, 32, SECT_4K, }, | |
fa0a8c71 | 536 | |
02d087db | 537 | /* Winbond -- w25x "blocks" are 64K, "sectors" are 4KiB */ |
d0e8c47c CG |
538 | { "w25x10", 0xef3011, 0, 64 * 1024, 2, SECT_4K, }, |
539 | { "w25x20", 0xef3012, 0, 64 * 1024, 4, SECT_4K, }, | |
540 | { "w25x40", 0xef3013, 0, 64 * 1024, 8, SECT_4K, }, | |
541 | { "w25x80", 0xef3014, 0, 64 * 1024, 16, SECT_4K, }, | |
542 | { "w25x16", 0xef3015, 0, 64 * 1024, 32, SECT_4K, }, | |
543 | { "w25x32", 0xef3016, 0, 64 * 1024, 64, SECT_4K, }, | |
544 | { "w25x64", 0xef3017, 0, 64 * 1024, 128, SECT_4K, }, | |
2f9f7628 ML |
545 | }; |
546 | ||
fa0a8c71 DB |
547 | static struct flash_info *__devinit jedec_probe(struct spi_device *spi) |
548 | { | |
549 | int tmp; | |
550 | u8 code = OPCODE_RDID; | |
daa84735 | 551 | u8 id[5]; |
fa0a8c71 | 552 | u32 jedec; |
d0e8c47c | 553 | u16 ext_jedec; |
fa0a8c71 DB |
554 | struct flash_info *info; |
555 | ||
556 | /* JEDEC also defines an optional "extended device information" | |
557 | * string for after vendor-specific data, after the three bytes | |
558 | * we use here. Supporting some chips might require using it. | |
559 | */ | |
daa84735 | 560 | tmp = spi_write_then_read(spi, &code, 1, id, 5); |
fa0a8c71 DB |
561 | if (tmp < 0) { |
562 | DEBUG(MTD_DEBUG_LEVEL0, "%s: error %d reading JEDEC ID\n", | |
563 | spi->dev.bus_id, tmp); | |
564 | return NULL; | |
565 | } | |
566 | jedec = id[0]; | |
567 | jedec = jedec << 8; | |
568 | jedec |= id[1]; | |
569 | jedec = jedec << 8; | |
570 | jedec |= id[2]; | |
571 | ||
d0e8c47c CG |
572 | ext_jedec = id[3] << 8 | id[4]; |
573 | ||
fa0a8c71 DB |
574 | for (tmp = 0, info = m25p_data; |
575 | tmp < ARRAY_SIZE(m25p_data); | |
576 | tmp++, info++) { | |
a3d3f73c | 577 | if (info->jedec_id == jedec) { |
d0e8c47c CG |
578 | if (ext_jedec != 0 && info->ext_id != ext_jedec) |
579 | continue; | |
fa0a8c71 | 580 | return info; |
a3d3f73c | 581 | } |
fa0a8c71 DB |
582 | } |
583 | dev_err(&spi->dev, "unrecognized JEDEC id %06x\n", jedec); | |
584 | return NULL; | |
585 | } | |
586 | ||
587 | ||
2f9f7628 ML |
588 | /* |
589 | * board specific setup should have ensured the SPI clock used here | |
590 | * matches what the READ command supports, at least until this driver | |
591 | * understands FAST_READ (for clocks over 25 MHz). | |
592 | */ | |
593 | static int __devinit m25p_probe(struct spi_device *spi) | |
594 | { | |
595 | struct flash_platform_data *data; | |
596 | struct m25p *flash; | |
597 | struct flash_info *info; | |
598 | unsigned i; | |
599 | ||
600 | /* Platform data helps sort out which chip type we have, as | |
fa0a8c71 DB |
601 | * well as how this board partitions it. If we don't have |
602 | * a chip ID, try the JEDEC id commands; they'll work for most | |
603 | * newer chips, even if we don't recognize the particular chip. | |
2f9f7628 ML |
604 | */ |
605 | data = spi->dev.platform_data; | |
fa0a8c71 DB |
606 | if (data && data->type) { |
607 | for (i = 0, info = m25p_data; | |
608 | i < ARRAY_SIZE(m25p_data); | |
609 | i++, info++) { | |
610 | if (strcmp(data->type, info->name) == 0) | |
611 | break; | |
612 | } | |
2f9f7628 | 613 | |
fa0a8c71 DB |
614 | /* unrecognized chip? */ |
615 | if (i == ARRAY_SIZE(m25p_data)) { | |
616 | DEBUG(MTD_DEBUG_LEVEL0, "%s: unrecognized id %s\n", | |
617 | spi->dev.bus_id, data->type); | |
618 | info = NULL; | |
619 | ||
620 | /* recognized; is that chip really what's there? */ | |
621 | } else if (info->jedec_id) { | |
622 | struct flash_info *chip = jedec_probe(spi); | |
623 | ||
624 | if (!chip || chip != info) { | |
625 | dev_warn(&spi->dev, "found %s, expected %s\n", | |
626 | chip ? chip->name : "UNKNOWN", | |
627 | info->name); | |
628 | info = NULL; | |
629 | } | |
630 | } | |
631 | } else | |
632 | info = jedec_probe(spi); | |
633 | ||
634 | if (!info) | |
2f9f7628 | 635 | return -ENODEV; |
2f9f7628 | 636 | |
e94b1766 | 637 | flash = kzalloc(sizeof *flash, GFP_KERNEL); |
2f9f7628 ML |
638 | if (!flash) |
639 | return -ENOMEM; | |
640 | ||
641 | flash->spi = spi; | |
7d5230ea | 642 | mutex_init(&flash->lock); |
2f9f7628 ML |
643 | dev_set_drvdata(&spi->dev, flash); |
644 | ||
72289824 MH |
645 | /* |
646 | * Atmel serial flash tend to power up | |
647 | * with the software protection bits set | |
648 | */ | |
649 | ||
650 | if (info->jedec_id >> 16 == 0x1f) { | |
651 | write_enable(flash); | |
652 | write_sr(flash, 0); | |
653 | } | |
654 | ||
fa0a8c71 | 655 | if (data && data->name) |
2f9f7628 ML |
656 | flash->mtd.name = data->name; |
657 | else | |
658 | flash->mtd.name = spi->dev.bus_id; | |
659 | ||
660 | flash->mtd.type = MTD_NORFLASH; | |
783ed81f | 661 | flash->mtd.writesize = 1; |
2f9f7628 ML |
662 | flash->mtd.flags = MTD_CAP_NORFLASH; |
663 | flash->mtd.size = info->sector_size * info->n_sectors; | |
2f9f7628 ML |
664 | flash->mtd.erase = m25p80_erase; |
665 | flash->mtd.read = m25p80_read; | |
666 | flash->mtd.write = m25p80_write; | |
667 | ||
fa0a8c71 DB |
668 | /* prefer "small sector" erase if possible */ |
669 | if (info->flags & SECT_4K) { | |
670 | flash->erase_opcode = OPCODE_BE_4K; | |
671 | flash->mtd.erasesize = 4096; | |
672 | } else { | |
673 | flash->erase_opcode = OPCODE_SE; | |
674 | flash->mtd.erasesize = info->sector_size; | |
675 | } | |
676 | ||
2f9f7628 ML |
677 | dev_info(&spi->dev, "%s (%d Kbytes)\n", info->name, |
678 | flash->mtd.size / 1024); | |
679 | ||
680 | DEBUG(MTD_DEBUG_LEVEL2, | |
02d087db DW |
681 | "mtd .name = %s, .size = 0x%.8x (%uMiB) " |
682 | ".erasesize = 0x%.8x (%uKiB) .numeraseregions = %d\n", | |
2f9f7628 ML |
683 | flash->mtd.name, |
684 | flash->mtd.size, flash->mtd.size / (1024*1024), | |
685 | flash->mtd.erasesize, flash->mtd.erasesize / 1024, | |
686 | flash->mtd.numeraseregions); | |
687 | ||
688 | if (flash->mtd.numeraseregions) | |
689 | for (i = 0; i < flash->mtd.numeraseregions; i++) | |
690 | DEBUG(MTD_DEBUG_LEVEL2, | |
691 | "mtd.eraseregions[%d] = { .offset = 0x%.8x, " | |
02d087db | 692 | ".erasesize = 0x%.8x (%uKiB), " |
2f9f7628 ML |
693 | ".numblocks = %d }\n", |
694 | i, flash->mtd.eraseregions[i].offset, | |
695 | flash->mtd.eraseregions[i].erasesize, | |
696 | flash->mtd.eraseregions[i].erasesize / 1024, | |
697 | flash->mtd.eraseregions[i].numblocks); | |
698 | ||
699 | ||
700 | /* partitions should match sector boundaries; and it may be good to | |
701 | * use readonly partitions for writeprotected sectors (BP2..BP0). | |
702 | */ | |
703 | if (mtd_has_partitions()) { | |
704 | struct mtd_partition *parts = NULL; | |
705 | int nr_parts = 0; | |
706 | ||
707 | #ifdef CONFIG_MTD_CMDLINE_PARTS | |
708 | static const char *part_probes[] = { "cmdlinepart", NULL, }; | |
709 | ||
710 | nr_parts = parse_mtd_partitions(&flash->mtd, | |
711 | part_probes, &parts, 0); | |
712 | #endif | |
713 | ||
714 | if (nr_parts <= 0 && data && data->parts) { | |
715 | parts = data->parts; | |
716 | nr_parts = data->nr_parts; | |
717 | } | |
718 | ||
719 | if (nr_parts > 0) { | |
fa0a8c71 | 720 | for (i = 0; i < nr_parts; i++) { |
2f9f7628 ML |
721 | DEBUG(MTD_DEBUG_LEVEL2, "partitions[%d] = " |
722 | "{.name = %s, .offset = 0x%.8x, " | |
02d087db | 723 | ".size = 0x%.8x (%uKiB) }\n", |
fa0a8c71 DB |
724 | i, parts[i].name, |
725 | parts[i].offset, | |
726 | parts[i].size, | |
727 | parts[i].size / 1024); | |
2f9f7628 ML |
728 | } |
729 | flash->partitioned = 1; | |
730 | return add_mtd_partitions(&flash->mtd, parts, nr_parts); | |
731 | } | |
732 | } else if (data->nr_parts) | |
733 | dev_warn(&spi->dev, "ignoring %d default partitions on %s\n", | |
734 | data->nr_parts, data->name); | |
735 | ||
736 | return add_mtd_device(&flash->mtd) == 1 ? -ENODEV : 0; | |
737 | } | |
738 | ||
739 | ||
740 | static int __devexit m25p_remove(struct spi_device *spi) | |
741 | { | |
742 | struct m25p *flash = dev_get_drvdata(&spi->dev); | |
743 | int status; | |
744 | ||
745 | /* Clean up MTD stuff. */ | |
746 | if (mtd_has_partitions() && flash->partitioned) | |
747 | status = del_mtd_partitions(&flash->mtd); | |
748 | else | |
749 | status = del_mtd_device(&flash->mtd); | |
750 | if (status == 0) | |
751 | kfree(flash); | |
752 | return 0; | |
753 | } | |
754 | ||
755 | ||
756 | static struct spi_driver m25p80_driver = { | |
757 | .driver = { | |
758 | .name = "m25p80", | |
759 | .bus = &spi_bus_type, | |
760 | .owner = THIS_MODULE, | |
761 | }, | |
762 | .probe = m25p_probe, | |
763 | .remove = __devexit_p(m25p_remove), | |
fa0a8c71 DB |
764 | |
765 | /* REVISIT: many of these chips have deep power-down modes, which | |
766 | * should clearly be entered on suspend() to minimize power use. | |
767 | * And also when they're otherwise idle... | |
768 | */ | |
2f9f7628 ML |
769 | }; |
770 | ||
771 | ||
772 | static int m25p80_init(void) | |
773 | { | |
774 | return spi_register_driver(&m25p80_driver); | |
775 | } | |
776 | ||
777 | ||
778 | static void m25p80_exit(void) | |
779 | { | |
780 | spi_unregister_driver(&m25p80_driver); | |
781 | } | |
782 | ||
783 | ||
784 | module_init(m25p80_init); | |
785 | module_exit(m25p80_exit); | |
786 | ||
787 | MODULE_LICENSE("GPL"); | |
788 | MODULE_AUTHOR("Mike Lavender"); | |
789 | MODULE_DESCRIPTION("MTD SPI driver for ST M25Pxx flash chips"); |