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efa2ca73 RJ |
1 | /* |
2 | * Handles the M-Systems DiskOnChip G3 chip | |
3 | * | |
4 | * Copyright (C) 2011 Robert Jarzmik | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | * | |
20 | */ | |
21 | ||
22 | #include <linux/kernel.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/errno.h> | |
25 | #include <linux/platform_device.h> | |
26 | #include <linux/string.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/io.h> | |
29 | #include <linux/delay.h> | |
30 | #include <linux/mtd/mtd.h> | |
31 | #include <linux/mtd/partitions.h> | |
d13d19ec RJ |
32 | #include <linux/bitmap.h> |
33 | #include <linux/bitrev.h> | |
34 | #include <linux/bch.h> | |
efa2ca73 RJ |
35 | |
36 | #include <linux/debugfs.h> | |
37 | #include <linux/seq_file.h> | |
38 | ||
39 | #define CREATE_TRACE_POINTS | |
40 | #include "docg3.h" | |
41 | ||
42 | /* | |
43 | * This driver handles the DiskOnChip G3 flash memory. | |
44 | * | |
45 | * As no specification is available from M-Systems/Sandisk, this drivers lacks | |
46 | * several functions available on the chip, as : | |
efa2ca73 | 47 | * - IPL write |
efa2ca73 RJ |
48 | * |
49 | * The bus data width (8bits versus 16bits) is not handled (if_cfg flag), and | |
50 | * the driver assumes a 16bits data bus. | |
51 | * | |
52 | * DocG3 relies on 2 ECC algorithms, which are handled in hardware : | |
53 | * - a 1 byte Hamming code stored in the OOB for each page | |
54 | * - a 7 bytes BCH code stored in the OOB for each page | |
d13d19ec | 55 | * The BCH ECC is : |
efa2ca73 RJ |
56 | * - BCH is in GF(2^14) |
57 | * - BCH is over data of 520 bytes (512 page + 7 page_info bytes | |
58 | * + 1 hamming byte) | |
59 | * - BCH can correct up to 4 bits (t = 4) | |
60 | * - BCH syndroms are calculated in hardware, and checked in hardware as well | |
61 | * | |
62 | */ | |
63 | ||
b604436c | 64 | static unsigned int reliable_mode; |
c3de8a8a RJ |
65 | module_param(reliable_mode, uint, 0); |
66 | MODULE_PARM_DESC(reliable_mode, "Set the docg3 mode (0=normal MLC, 1=fast, " | |
67 | "2=reliable) : MLC normal operations are in normal mode"); | |
68 | ||
732b63bd RJ |
69 | /** |
70 | * struct docg3_oobinfo - DiskOnChip G3 OOB layout | |
71 | * @eccbytes: 8 bytes are used (1 for Hamming ECC, 7 for BCH ECC) | |
72 | * @eccpos: ecc positions (byte 7 is Hamming ECC, byte 8-14 are BCH ECC) | |
73 | * @oobfree: free pageinfo bytes (byte 0 until byte 6, byte 15 | |
74 | * @oobavail: 8 available bytes remaining after ECC toll | |
75 | */ | |
76 | static struct nand_ecclayout docg3_oobinfo = { | |
77 | .eccbytes = 8, | |
78 | .eccpos = {7, 8, 9, 10, 11, 12, 13, 14}, | |
79 | .oobfree = {{0, 7}, {15, 1} }, | |
80 | .oobavail = 8, | |
81 | }; | |
82 | ||
efa2ca73 RJ |
83 | static inline u8 doc_readb(struct docg3 *docg3, u16 reg) |
84 | { | |
1b15a5f9 | 85 | u8 val = readb(docg3->cascade->base + reg); |
efa2ca73 RJ |
86 | |
87 | trace_docg3_io(0, 8, reg, (int)val); | |
88 | return val; | |
89 | } | |
90 | ||
91 | static inline u16 doc_readw(struct docg3 *docg3, u16 reg) | |
92 | { | |
1b15a5f9 | 93 | u16 val = readw(docg3->cascade->base + reg); |
efa2ca73 RJ |
94 | |
95 | trace_docg3_io(0, 16, reg, (int)val); | |
96 | return val; | |
97 | } | |
98 | ||
99 | static inline void doc_writeb(struct docg3 *docg3, u8 val, u16 reg) | |
100 | { | |
1b15a5f9 | 101 | writeb(val, docg3->cascade->base + reg); |
84a93058 | 102 | trace_docg3_io(1, 8, reg, val); |
efa2ca73 RJ |
103 | } |
104 | ||
105 | static inline void doc_writew(struct docg3 *docg3, u16 val, u16 reg) | |
106 | { | |
1b15a5f9 | 107 | writew(val, docg3->cascade->base + reg); |
efa2ca73 RJ |
108 | trace_docg3_io(1, 16, reg, val); |
109 | } | |
110 | ||
111 | static inline void doc_flash_command(struct docg3 *docg3, u8 cmd) | |
112 | { | |
113 | doc_writeb(docg3, cmd, DOC_FLASHCOMMAND); | |
114 | } | |
115 | ||
116 | static inline void doc_flash_sequence(struct docg3 *docg3, u8 seq) | |
117 | { | |
118 | doc_writeb(docg3, seq, DOC_FLASHSEQUENCE); | |
119 | } | |
120 | ||
121 | static inline void doc_flash_address(struct docg3 *docg3, u8 addr) | |
122 | { | |
123 | doc_writeb(docg3, addr, DOC_FLASHADDRESS); | |
124 | } | |
125 | ||
afffeec9 | 126 | static char const * const part_probes[] = { "cmdlinepart", "saftlpart", NULL }; |
efa2ca73 RJ |
127 | |
128 | static int doc_register_readb(struct docg3 *docg3, int reg) | |
129 | { | |
130 | u8 val; | |
131 | ||
132 | doc_writew(docg3, reg, DOC_READADDRESS); | |
133 | val = doc_readb(docg3, reg); | |
134 | doc_vdbg("Read register %04x : %02x\n", reg, val); | |
135 | return val; | |
136 | } | |
137 | ||
138 | static int doc_register_readw(struct docg3 *docg3, int reg) | |
139 | { | |
140 | u16 val; | |
141 | ||
142 | doc_writew(docg3, reg, DOC_READADDRESS); | |
143 | val = doc_readw(docg3, reg); | |
144 | doc_vdbg("Read register %04x : %04x\n", reg, val); | |
145 | return val; | |
146 | } | |
147 | ||
148 | /** | |
149 | * doc_delay - delay docg3 operations | |
150 | * @docg3: the device | |
151 | * @nbNOPs: the number of NOPs to issue | |
152 | * | |
153 | * As no specification is available, the right timings between chip commands are | |
154 | * unknown. The only available piece of information are the observed nops on a | |
155 | * working docg3 chip. | |
156 | * Therefore, doc_delay relies on a busy loop of NOPs, instead of scheduler | |
157 | * friendlier msleep() functions or blocking mdelay(). | |
158 | */ | |
159 | static void doc_delay(struct docg3 *docg3, int nbNOPs) | |
160 | { | |
161 | int i; | |
162 | ||
ac48e800 | 163 | doc_vdbg("NOP x %d\n", nbNOPs); |
efa2ca73 RJ |
164 | for (i = 0; i < nbNOPs; i++) |
165 | doc_writeb(docg3, 0, DOC_NOP); | |
166 | } | |
167 | ||
168 | static int is_prot_seq_error(struct docg3 *docg3) | |
169 | { | |
170 | int ctrl; | |
171 | ||
172 | ctrl = doc_register_readb(docg3, DOC_FLASHCONTROL); | |
173 | return ctrl & (DOC_CTRL_PROTECTION_ERROR | DOC_CTRL_SEQUENCE_ERROR); | |
174 | } | |
175 | ||
176 | static int doc_is_ready(struct docg3 *docg3) | |
177 | { | |
178 | int ctrl; | |
179 | ||
180 | ctrl = doc_register_readb(docg3, DOC_FLASHCONTROL); | |
181 | return ctrl & DOC_CTRL_FLASHREADY; | |
182 | } | |
183 | ||
184 | static int doc_wait_ready(struct docg3 *docg3) | |
185 | { | |
186 | int maxWaitCycles = 100; | |
187 | ||
188 | do { | |
189 | doc_delay(docg3, 4); | |
190 | cpu_relax(); | |
191 | } while (!doc_is_ready(docg3) && maxWaitCycles--); | |
192 | doc_delay(docg3, 2); | |
193 | if (maxWaitCycles > 0) | |
194 | return 0; | |
195 | else | |
196 | return -EIO; | |
197 | } | |
198 | ||
199 | static int doc_reset_seq(struct docg3 *docg3) | |
200 | { | |
201 | int ret; | |
202 | ||
203 | doc_writeb(docg3, 0x10, DOC_FLASHCONTROL); | |
204 | doc_flash_sequence(docg3, DOC_SEQ_RESET); | |
205 | doc_flash_command(docg3, DOC_CMD_RESET); | |
206 | doc_delay(docg3, 2); | |
207 | ret = doc_wait_ready(docg3); | |
208 | ||
209 | doc_dbg("doc_reset_seq() -> isReady=%s\n", ret ? "false" : "true"); | |
210 | return ret; | |
211 | } | |
212 | ||
213 | /** | |
214 | * doc_read_data_area - Read data from data area | |
215 | * @docg3: the device | |
32a50b3a RJ |
216 | * @buf: the buffer to fill in (might be NULL is dummy reads) |
217 | * @len: the length to read | |
efa2ca73 RJ |
218 | * @first: first time read, DOC_READADDRESS should be set |
219 | * | |
220 | * Reads bytes from flash data. Handles the single byte / even bytes reads. | |
221 | */ | |
222 | static void doc_read_data_area(struct docg3 *docg3, void *buf, int len, | |
223 | int first) | |
224 | { | |
225 | int i, cdr, len4; | |
226 | u16 data16, *dst16; | |
227 | u8 data8, *dst8; | |
228 | ||
229 | doc_dbg("doc_read_data_area(buf=%p, len=%d)\n", buf, len); | |
52c2d9aa | 230 | cdr = len & 0x1; |
efa2ca73 RJ |
231 | len4 = len - cdr; |
232 | ||
233 | if (first) | |
234 | doc_writew(docg3, DOC_IOSPACE_DATA, DOC_READADDRESS); | |
235 | dst16 = buf; | |
236 | for (i = 0; i < len4; i += 2) { | |
237 | data16 = doc_readw(docg3, DOC_IOSPACE_DATA); | |
32a50b3a RJ |
238 | if (dst16) { |
239 | *dst16 = data16; | |
240 | dst16++; | |
241 | } | |
efa2ca73 RJ |
242 | } |
243 | ||
244 | if (cdr) { | |
245 | doc_writew(docg3, DOC_IOSPACE_DATA | DOC_READADDR_ONE_BYTE, | |
246 | DOC_READADDRESS); | |
247 | doc_delay(docg3, 1); | |
248 | dst8 = (u8 *)dst16; | |
249 | for (i = 0; i < cdr; i++) { | |
250 | data8 = doc_readb(docg3, DOC_IOSPACE_DATA); | |
32a50b3a RJ |
251 | if (dst8) { |
252 | *dst8 = data8; | |
253 | dst8++; | |
254 | } | |
efa2ca73 RJ |
255 | } |
256 | } | |
257 | } | |
258 | ||
fb50b58e RJ |
259 | /** |
260 | * doc_write_data_area - Write data into data area | |
261 | * @docg3: the device | |
262 | * @buf: the buffer to get input bytes from | |
263 | * @len: the length to write | |
264 | * | |
265 | * Writes bytes into flash data. Handles the single byte / even bytes writes. | |
266 | */ | |
267 | static void doc_write_data_area(struct docg3 *docg3, const void *buf, int len) | |
268 | { | |
269 | int i, cdr, len4; | |
270 | u16 *src16; | |
271 | u8 *src8; | |
272 | ||
273 | doc_dbg("doc_write_data_area(buf=%p, len=%d)\n", buf, len); | |
274 | cdr = len & 0x3; | |
275 | len4 = len - cdr; | |
276 | ||
277 | doc_writew(docg3, DOC_IOSPACE_DATA, DOC_READADDRESS); | |
278 | src16 = (u16 *)buf; | |
279 | for (i = 0; i < len4; i += 2) { | |
280 | doc_writew(docg3, *src16, DOC_IOSPACE_DATA); | |
281 | src16++; | |
282 | } | |
283 | ||
284 | src8 = (u8 *)src16; | |
285 | for (i = 0; i < cdr; i++) { | |
286 | doc_writew(docg3, DOC_IOSPACE_DATA | DOC_READADDR_ONE_BYTE, | |
287 | DOC_READADDRESS); | |
288 | doc_writeb(docg3, *src8, DOC_IOSPACE_DATA); | |
289 | src8++; | |
290 | } | |
291 | } | |
292 | ||
efa2ca73 | 293 | /** |
c3de8a8a | 294 | * doc_set_data_mode - Sets the flash to normal or reliable data mode |
efa2ca73 RJ |
295 | * @docg3: the device |
296 | * | |
297 | * The reliable data mode is a bit slower than the fast mode, but less errors | |
298 | * occur. Entering the reliable mode cannot be done without entering the fast | |
299 | * mode first. | |
c3de8a8a RJ |
300 | * |
301 | * In reliable mode, pages 2*n and 2*n+1 are clones. Writing to page 0 of blocks | |
302 | * (4,5) make the hardware write also to page 1 of blocks blocks(4,5). Reading | |
303 | * from page 0 of blocks (4,5) or from page 1 of blocks (4,5) gives the same | |
304 | * result, which is a logical and between bytes from page 0 and page 1 (which is | |
305 | * consistent with the fact that writing to a page is _clearing_ bits of that | |
306 | * page). | |
efa2ca73 RJ |
307 | */ |
308 | static void doc_set_reliable_mode(struct docg3 *docg3) | |
309 | { | |
c3de8a8a RJ |
310 | static char *strmode[] = { "normal", "fast", "reliable", "invalid" }; |
311 | ||
312 | doc_dbg("doc_set_reliable_mode(%s)\n", strmode[docg3->reliable]); | |
313 | switch (docg3->reliable) { | |
314 | case 0: | |
315 | break; | |
316 | case 1: | |
317 | doc_flash_sequence(docg3, DOC_SEQ_SET_FASTMODE); | |
318 | doc_flash_command(docg3, DOC_CMD_FAST_MODE); | |
319 | break; | |
320 | case 2: | |
321 | doc_flash_sequence(docg3, DOC_SEQ_SET_RELIABLEMODE); | |
322 | doc_flash_command(docg3, DOC_CMD_FAST_MODE); | |
323 | doc_flash_command(docg3, DOC_CMD_RELIABLE_MODE); | |
324 | break; | |
325 | default: | |
326 | doc_err("doc_set_reliable_mode(): invalid mode\n"); | |
327 | break; | |
328 | } | |
efa2ca73 RJ |
329 | doc_delay(docg3, 2); |
330 | } | |
331 | ||
332 | /** | |
333 | * doc_set_asic_mode - Set the ASIC mode | |
334 | * @docg3: the device | |
335 | * @mode: the mode | |
336 | * | |
337 | * The ASIC can work in 3 modes : | |
338 | * - RESET: all registers are zeroed | |
339 | * - NORMAL: receives and handles commands | |
340 | * - POWERDOWN: minimal poweruse, flash parts shut off | |
341 | */ | |
342 | static void doc_set_asic_mode(struct docg3 *docg3, u8 mode) | |
343 | { | |
344 | int i; | |
345 | ||
346 | for (i = 0; i < 12; i++) | |
347 | doc_readb(docg3, DOC_IOSPACE_IPL); | |
348 | ||
349 | mode |= DOC_ASICMODE_MDWREN; | |
350 | doc_dbg("doc_set_asic_mode(%02x)\n", mode); | |
351 | doc_writeb(docg3, mode, DOC_ASICMODE); | |
352 | doc_writeb(docg3, ~mode, DOC_ASICMODECONFIRM); | |
353 | doc_delay(docg3, 1); | |
354 | } | |
355 | ||
356 | /** | |
357 | * doc_set_device_id - Sets the devices id for cascaded G3 chips | |
358 | * @docg3: the device | |
359 | * @id: the chip to select (amongst 0, 1, 2, 3) | |
360 | * | |
361 | * There can be 4 cascaded G3 chips. This function selects the one which will | |
362 | * should be the active one. | |
363 | */ | |
364 | static void doc_set_device_id(struct docg3 *docg3, int id) | |
365 | { | |
366 | u8 ctrl; | |
367 | ||
368 | doc_dbg("doc_set_device_id(%d)\n", id); | |
369 | doc_writeb(docg3, id, DOC_DEVICESELECT); | |
370 | ctrl = doc_register_readb(docg3, DOC_FLASHCONTROL); | |
371 | ||
372 | ctrl &= ~DOC_CTRL_VIOLATION; | |
373 | ctrl |= DOC_CTRL_CE; | |
374 | doc_writeb(docg3, ctrl, DOC_FLASHCONTROL); | |
375 | } | |
376 | ||
377 | /** | |
378 | * doc_set_extra_page_mode - Change flash page layout | |
379 | * @docg3: the device | |
380 | * | |
381 | * Normally, the flash page is split into the data (512 bytes) and the out of | |
382 | * band data (16 bytes). For each, 4 more bytes can be accessed, where the wear | |
383 | * leveling counters are stored. To access this last area of 4 bytes, a special | |
384 | * mode must be input to the flash ASIC. | |
385 | * | |
86d2f6fb | 386 | * Returns 0 if no error occurred, -EIO else. |
efa2ca73 RJ |
387 | */ |
388 | static int doc_set_extra_page_mode(struct docg3 *docg3) | |
389 | { | |
390 | int fctrl; | |
391 | ||
392 | doc_dbg("doc_set_extra_page_mode()\n"); | |
393 | doc_flash_sequence(docg3, DOC_SEQ_PAGE_SIZE_532); | |
394 | doc_flash_command(docg3, DOC_CMD_PAGE_SIZE_532); | |
395 | doc_delay(docg3, 2); | |
396 | ||
397 | fctrl = doc_register_readb(docg3, DOC_FLASHCONTROL); | |
398 | if (fctrl & (DOC_CTRL_PROTECTION_ERROR | DOC_CTRL_SEQUENCE_ERROR)) | |
399 | return -EIO; | |
400 | else | |
401 | return 0; | |
402 | } | |
403 | ||
fb50b58e RJ |
404 | /** |
405 | * doc_setup_addr_sector - Setup blocks/page/ofs address for one plane | |
406 | * @docg3: the device | |
407 | * @sector: the sector | |
408 | */ | |
409 | static void doc_setup_addr_sector(struct docg3 *docg3, int sector) | |
410 | { | |
411 | doc_delay(docg3, 1); | |
412 | doc_flash_address(docg3, sector & 0xff); | |
413 | doc_flash_address(docg3, (sector >> 8) & 0xff); | |
414 | doc_flash_address(docg3, (sector >> 16) & 0xff); | |
415 | doc_delay(docg3, 1); | |
416 | } | |
417 | ||
418 | /** | |
419 | * doc_setup_writeaddr_sector - Setup blocks/page/ofs address for one plane | |
420 | * @docg3: the device | |
421 | * @sector: the sector | |
422 | * @ofs: the offset in the page, between 0 and (512 + 16 + 512) | |
423 | */ | |
424 | static void doc_setup_writeaddr_sector(struct docg3 *docg3, int sector, int ofs) | |
425 | { | |
426 | ofs = ofs >> 2; | |
427 | doc_delay(docg3, 1); | |
428 | doc_flash_address(docg3, ofs & 0xff); | |
429 | doc_flash_address(docg3, sector & 0xff); | |
430 | doc_flash_address(docg3, (sector >> 8) & 0xff); | |
431 | doc_flash_address(docg3, (sector >> 16) & 0xff); | |
432 | doc_delay(docg3, 1); | |
433 | } | |
434 | ||
efa2ca73 RJ |
435 | /** |
436 | * doc_seek - Set both flash planes to the specified block, page for reading | |
437 | * @docg3: the device | |
438 | * @block0: the first plane block index | |
439 | * @block1: the second plane block index | |
440 | * @page: the page index within the block | |
441 | * @wear: if true, read will occur on the 4 extra bytes of the wear area | |
442 | * @ofs: offset in page to read | |
443 | * | |
444 | * Programs the flash even and odd planes to the specific block and page. | |
445 | * Alternatively, programs the flash to the wear area of the specified page. | |
446 | */ | |
447 | static int doc_read_seek(struct docg3 *docg3, int block0, int block1, int page, | |
448 | int wear, int ofs) | |
449 | { | |
450 | int sector, ret = 0; | |
451 | ||
452 | doc_dbg("doc_seek(blocks=(%d,%d), page=%d, ofs=%d, wear=%d)\n", | |
453 | block0, block1, page, ofs, wear); | |
454 | ||
455 | if (!wear && (ofs < 2 * DOC_LAYOUT_PAGE_SIZE)) { | |
456 | doc_flash_sequence(docg3, DOC_SEQ_SET_PLANE1); | |
457 | doc_flash_command(docg3, DOC_CMD_READ_PLANE1); | |
458 | doc_delay(docg3, 2); | |
459 | } else { | |
460 | doc_flash_sequence(docg3, DOC_SEQ_SET_PLANE2); | |
461 | doc_flash_command(docg3, DOC_CMD_READ_PLANE2); | |
462 | doc_delay(docg3, 2); | |
463 | } | |
464 | ||
465 | doc_set_reliable_mode(docg3); | |
466 | if (wear) | |
467 | ret = doc_set_extra_page_mode(docg3); | |
468 | if (ret) | |
469 | goto out; | |
470 | ||
efa2ca73 | 471 | doc_flash_sequence(docg3, DOC_SEQ_READ); |
fb50b58e | 472 | sector = (block0 << DOC_ADDR_BLOCK_SHIFT) + (page & DOC_ADDR_PAGE_MASK); |
efa2ca73 | 473 | doc_flash_command(docg3, DOC_CMD_PROG_BLOCK_ADDR); |
fb50b58e | 474 | doc_setup_addr_sector(docg3, sector); |
efa2ca73 RJ |
475 | |
476 | sector = (block1 << DOC_ADDR_BLOCK_SHIFT) + (page & DOC_ADDR_PAGE_MASK); | |
477 | doc_flash_command(docg3, DOC_CMD_PROG_BLOCK_ADDR); | |
fb50b58e | 478 | doc_setup_addr_sector(docg3, sector); |
efa2ca73 | 479 | doc_delay(docg3, 1); |
fb50b58e RJ |
480 | |
481 | out: | |
482 | return ret; | |
483 | } | |
484 | ||
485 | /** | |
486 | * doc_write_seek - Set both flash planes to the specified block, page for writing | |
487 | * @docg3: the device | |
488 | * @block0: the first plane block index | |
489 | * @block1: the second plane block index | |
490 | * @page: the page index within the block | |
491 | * @ofs: offset in page to write | |
492 | * | |
493 | * Programs the flash even and odd planes to the specific block and page. | |
494 | * Alternatively, programs the flash to the wear area of the specified page. | |
495 | */ | |
496 | static int doc_write_seek(struct docg3 *docg3, int block0, int block1, int page, | |
497 | int ofs) | |
498 | { | |
499 | int ret = 0, sector; | |
500 | ||
501 | doc_dbg("doc_write_seek(blocks=(%d,%d), page=%d, ofs=%d)\n", | |
502 | block0, block1, page, ofs); | |
503 | ||
504 | doc_set_reliable_mode(docg3); | |
505 | ||
506 | if (ofs < 2 * DOC_LAYOUT_PAGE_SIZE) { | |
507 | doc_flash_sequence(docg3, DOC_SEQ_SET_PLANE1); | |
508 | doc_flash_command(docg3, DOC_CMD_READ_PLANE1); | |
509 | doc_delay(docg3, 2); | |
510 | } else { | |
511 | doc_flash_sequence(docg3, DOC_SEQ_SET_PLANE2); | |
512 | doc_flash_command(docg3, DOC_CMD_READ_PLANE2); | |
513 | doc_delay(docg3, 2); | |
514 | } | |
515 | ||
516 | doc_flash_sequence(docg3, DOC_SEQ_PAGE_SETUP); | |
517 | doc_flash_command(docg3, DOC_CMD_PROG_CYCLE1); | |
518 | ||
519 | sector = (block0 << DOC_ADDR_BLOCK_SHIFT) + (page & DOC_ADDR_PAGE_MASK); | |
520 | doc_setup_writeaddr_sector(docg3, sector, ofs); | |
521 | ||
522 | doc_flash_command(docg3, DOC_CMD_PROG_CYCLE3); | |
efa2ca73 | 523 | doc_delay(docg3, 2); |
fb50b58e RJ |
524 | ret = doc_wait_ready(docg3); |
525 | if (ret) | |
526 | goto out; | |
527 | ||
528 | doc_flash_command(docg3, DOC_CMD_PROG_CYCLE1); | |
529 | sector = (block1 << DOC_ADDR_BLOCK_SHIFT) + (page & DOC_ADDR_PAGE_MASK); | |
530 | doc_setup_writeaddr_sector(docg3, sector, ofs); | |
531 | doc_delay(docg3, 1); | |
efa2ca73 RJ |
532 | |
533 | out: | |
534 | return ret; | |
535 | } | |
536 | ||
fb50b58e | 537 | |
efa2ca73 RJ |
538 | /** |
539 | * doc_read_page_ecc_init - Initialize hardware ECC engine | |
540 | * @docg3: the device | |
541 | * @len: the number of bytes covered by the ECC (BCH covered) | |
542 | * | |
543 | * The function does initialize the hardware ECC engine to compute the Hamming | |
b604436c | 544 | * ECC (on 1 byte) and the BCH hardware ECC (on 7 bytes). |
efa2ca73 RJ |
545 | * |
546 | * Return 0 if succeeded, -EIO on error | |
547 | */ | |
548 | static int doc_read_page_ecc_init(struct docg3 *docg3, int len) | |
549 | { | |
550 | doc_writew(docg3, DOC_ECCCONF0_READ_MODE | |
551 | | DOC_ECCCONF0_BCH_ENABLE | DOC_ECCCONF0_HAMMING_ENABLE | |
552 | | (len & DOC_ECCCONF0_DATA_BYTES_MASK), | |
553 | DOC_ECCCONF0); | |
554 | doc_delay(docg3, 4); | |
555 | doc_register_readb(docg3, DOC_FLASHCONTROL); | |
556 | return doc_wait_ready(docg3); | |
557 | } | |
558 | ||
fb50b58e RJ |
559 | /** |
560 | * doc_write_page_ecc_init - Initialize hardware BCH ECC engine | |
561 | * @docg3: the device | |
562 | * @len: the number of bytes covered by the ECC (BCH covered) | |
563 | * | |
564 | * The function does initialize the hardware ECC engine to compute the Hamming | |
b604436c | 565 | * ECC (on 1 byte) and the BCH hardware ECC (on 7 bytes). |
fb50b58e RJ |
566 | * |
567 | * Return 0 if succeeded, -EIO on error | |
568 | */ | |
569 | static int doc_write_page_ecc_init(struct docg3 *docg3, int len) | |
570 | { | |
b604436c | 571 | doc_writew(docg3, DOC_ECCCONF0_WRITE_MODE |
fb50b58e RJ |
572 | | DOC_ECCCONF0_BCH_ENABLE | DOC_ECCCONF0_HAMMING_ENABLE |
573 | | (len & DOC_ECCCONF0_DATA_BYTES_MASK), | |
574 | DOC_ECCCONF0); | |
575 | doc_delay(docg3, 4); | |
576 | doc_register_readb(docg3, DOC_FLASHCONTROL); | |
577 | return doc_wait_ready(docg3); | |
578 | } | |
579 | ||
580 | /** | |
581 | * doc_ecc_disable - Disable Hamming and BCH ECC hardware calculator | |
582 | * @docg3: the device | |
583 | * | |
584 | * Disables the hardware ECC generator and checker, for unchecked reads (as when | |
585 | * reading OOB only or write status byte). | |
586 | */ | |
587 | static void doc_ecc_disable(struct docg3 *docg3) | |
588 | { | |
589 | doc_writew(docg3, DOC_ECCCONF0_READ_MODE, DOC_ECCCONF0); | |
590 | doc_delay(docg3, 4); | |
591 | } | |
592 | ||
593 | /** | |
594 | * doc_hamming_ecc_init - Initialize hardware Hamming ECC engine | |
595 | * @docg3: the device | |
596 | * @nb_bytes: the number of bytes covered by the ECC (Hamming covered) | |
597 | * | |
598 | * This function programs the ECC hardware to compute the hamming code on the | |
599 | * last provided N bytes to the hardware generator. | |
600 | */ | |
601 | static void doc_hamming_ecc_init(struct docg3 *docg3, int nb_bytes) | |
602 | { | |
603 | u8 ecc_conf1; | |
604 | ||
605 | ecc_conf1 = doc_register_readb(docg3, DOC_ECCCONF1); | |
606 | ecc_conf1 &= ~DOC_ECCCONF1_HAMMING_BITS_MASK; | |
607 | ecc_conf1 |= (nb_bytes & DOC_ECCCONF1_HAMMING_BITS_MASK); | |
608 | doc_writeb(docg3, ecc_conf1, DOC_ECCCONF1); | |
609 | } | |
610 | ||
d13d19ec | 611 | /** |
b604436c | 612 | * doc_ecc_bch_fix_data - Fix if need be read data from flash |
d13d19ec RJ |
613 | * @docg3: the device |
614 | * @buf: the buffer of read data (512 + 7 + 1 bytes) | |
615 | * @hwecc: the hardware calculated ECC. | |
616 | * It's in fact recv_ecc ^ calc_ecc, where recv_ecc was read from OOB | |
617 | * area data, and calc_ecc the ECC calculated by the hardware generator. | |
618 | * | |
619 | * Checks if the received data matches the ECC, and if an error is detected, | |
620 | * tries to fix the bit flips (at most 4) in the buffer buf. As the docg3 | |
621 | * understands the (data, ecc, syndroms) in an inverted order in comparison to | |
622 | * the BCH library, the function reverses the order of bits (ie. bit7 and bit0, | |
623 | * bit6 and bit 1, ...) for all ECC data. | |
624 | * | |
625 | * The hardware ecc unit produces oob_ecc ^ calc_ecc. The kernel's bch | |
626 | * algorithm is used to decode this. However the hw operates on page | |
627 | * data in a bit order that is the reverse of that of the bch alg, | |
628 | * requiring that the bits be reversed on the result. Thanks to Ivan | |
629 | * Djelic for his analysis. | |
630 | * | |
631 | * Returns number of fixed bits (0, 1, 2, 3, 4) or -EBADMSG if too many bit | |
632 | * errors were detected and cannot be fixed. | |
633 | */ | |
634 | static int doc_ecc_bch_fix_data(struct docg3 *docg3, void *buf, u8 *hwecc) | |
635 | { | |
636 | u8 ecc[DOC_ECC_BCH_SIZE]; | |
637 | int errorpos[DOC_ECC_BCH_T], i, numerrs; | |
638 | ||
639 | for (i = 0; i < DOC_ECC_BCH_SIZE; i++) | |
640 | ecc[i] = bitrev8(hwecc[i]); | |
1b15a5f9 RJ |
641 | numerrs = decode_bch(docg3->cascade->bch, NULL, |
642 | DOC_ECC_BCH_COVERED_BYTES, | |
d13d19ec RJ |
643 | NULL, ecc, NULL, errorpos); |
644 | BUG_ON(numerrs == -EINVAL); | |
645 | if (numerrs < 0) | |
646 | goto out; | |
647 | ||
648 | for (i = 0; i < numerrs; i++) | |
649 | errorpos[i] = (errorpos[i] & ~7) | (7 - (errorpos[i] & 7)); | |
650 | for (i = 0; i < numerrs; i++) | |
651 | if (errorpos[i] < DOC_ECC_BCH_COVERED_BYTES*8) | |
652 | /* error is located in data, correct it */ | |
653 | change_bit(errorpos[i], buf); | |
654 | out: | |
655 | doc_dbg("doc_ecc_bch_fix_data: flipped %d bits\n", numerrs); | |
656 | return numerrs; | |
657 | } | |
658 | ||
659 | ||
efa2ca73 RJ |
660 | /** |
661 | * doc_read_page_prepare - Prepares reading data from a flash page | |
662 | * @docg3: the device | |
663 | * @block0: the first plane block index on flash memory | |
664 | * @block1: the second plane block index on flash memory | |
665 | * @page: the page index in the block | |
666 | * @offset: the offset in the page (must be a multiple of 4) | |
667 | * | |
668 | * Prepares the page to be read in the flash memory : | |
669 | * - tell ASIC to map the flash pages | |
670 | * - tell ASIC to be in read mode | |
671 | * | |
672 | * After a call to this method, a call to doc_read_page_finish is mandatory, | |
673 | * to end the read cycle of the flash. | |
674 | * | |
675 | * Read data from a flash page. The length to be read must be between 0 and | |
676 | * (page_size + oob_size + wear_size), ie. 532, and a multiple of 4 (because | |
677 | * the extra bytes reading is not implemented). | |
678 | * | |
679 | * As pages are grouped by 2 (in 2 planes), reading from a page must be done | |
680 | * in two steps: | |
681 | * - one read of 512 bytes at offset 0 | |
682 | * - one read of 512 bytes at offset 512 + 16 | |
683 | * | |
86d2f6fb | 684 | * Returns 0 if successful, -EIO if a read error occurred. |
efa2ca73 RJ |
685 | */ |
686 | static int doc_read_page_prepare(struct docg3 *docg3, int block0, int block1, | |
687 | int page, int offset) | |
688 | { | |
689 | int wear_area = 0, ret = 0; | |
690 | ||
691 | doc_dbg("doc_read_page_prepare(blocks=(%d,%d), page=%d, ofsInPage=%d)\n", | |
692 | block0, block1, page, offset); | |
693 | if (offset >= DOC_LAYOUT_WEAR_OFFSET) | |
694 | wear_area = 1; | |
695 | if (!wear_area && offset > (DOC_LAYOUT_PAGE_OOB_SIZE * 2)) | |
696 | return -EINVAL; | |
697 | ||
698 | doc_set_device_id(docg3, docg3->device_id); | |
699 | ret = doc_reset_seq(docg3); | |
700 | if (ret) | |
701 | goto err; | |
702 | ||
703 | /* Program the flash address block and page */ | |
704 | ret = doc_read_seek(docg3, block0, block1, page, wear_area, offset); | |
705 | if (ret) | |
706 | goto err; | |
707 | ||
708 | doc_flash_command(docg3, DOC_CMD_READ_ALL_PLANES); | |
709 | doc_delay(docg3, 2); | |
710 | doc_wait_ready(docg3); | |
711 | ||
712 | doc_flash_command(docg3, DOC_CMD_SET_ADDR_READ); | |
713 | doc_delay(docg3, 1); | |
714 | if (offset >= DOC_LAYOUT_PAGE_SIZE * 2) | |
715 | offset -= 2 * DOC_LAYOUT_PAGE_SIZE; | |
716 | doc_flash_address(docg3, offset >> 2); | |
717 | doc_delay(docg3, 1); | |
718 | doc_wait_ready(docg3); | |
719 | ||
720 | doc_flash_command(docg3, DOC_CMD_READ_FLASH); | |
721 | ||
722 | return 0; | |
723 | err: | |
724 | doc_writeb(docg3, 0, DOC_DATAEND); | |
725 | doc_delay(docg3, 2); | |
726 | return -EIO; | |
727 | } | |
728 | ||
729 | /** | |
730 | * doc_read_page_getbytes - Reads bytes from a prepared page | |
731 | * @docg3: the device | |
732 | * @len: the number of bytes to be read (must be a multiple of 4) | |
d107bc34 | 733 | * @buf: the buffer to be filled in (or NULL is forget bytes) |
efa2ca73 | 734 | * @first: 1 if first time read, DOC_READADDRESS should be set |
52c2d9aa RJ |
735 | * @last_odd: 1 if last read ended up on an odd byte |
736 | * | |
737 | * Reads bytes from a prepared page. There is a trickery here : if the last read | |
738 | * ended up on an odd offset in the 1024 bytes double page, ie. between the 2 | |
739 | * planes, the first byte must be read apart. If a word (16bit) read was used, | |
740 | * the read would return the byte of plane 2 as low *and* high endian, which | |
741 | * will mess the read. | |
efa2ca73 RJ |
742 | * |
743 | */ | |
744 | static int doc_read_page_getbytes(struct docg3 *docg3, int len, u_char *buf, | |
52c2d9aa | 745 | int first, int last_odd) |
efa2ca73 | 746 | { |
52c2d9aa RJ |
747 | if (last_odd && len > 0) { |
748 | doc_read_data_area(docg3, buf, 1, first); | |
749 | doc_read_data_area(docg3, buf ? buf + 1 : buf, len - 1, 0); | |
750 | } else { | |
751 | doc_read_data_area(docg3, buf, len, first); | |
752 | } | |
efa2ca73 RJ |
753 | doc_delay(docg3, 2); |
754 | return len; | |
755 | } | |
756 | ||
fb50b58e RJ |
757 | /** |
758 | * doc_write_page_putbytes - Writes bytes into a prepared page | |
759 | * @docg3: the device | |
760 | * @len: the number of bytes to be written | |
761 | * @buf: the buffer of input bytes | |
762 | * | |
763 | */ | |
764 | static void doc_write_page_putbytes(struct docg3 *docg3, int len, | |
765 | const u_char *buf) | |
766 | { | |
767 | doc_write_data_area(docg3, buf, len); | |
768 | doc_delay(docg3, 2); | |
769 | } | |
770 | ||
efa2ca73 | 771 | /** |
b604436c | 772 | * doc_get_bch_hw_ecc - Get hardware calculated BCH ECC |
efa2ca73 | 773 | * @docg3: the device |
b604436c | 774 | * @hwecc: the array of 7 integers where the hardware ecc will be stored |
efa2ca73 | 775 | */ |
b604436c | 776 | static void doc_get_bch_hw_ecc(struct docg3 *docg3, u8 *hwecc) |
efa2ca73 RJ |
777 | { |
778 | int i; | |
779 | ||
780 | for (i = 0; i < DOC_ECC_BCH_SIZE; i++) | |
b604436c | 781 | hwecc[i] = doc_register_readb(docg3, DOC_BCH_HW_ECC(i)); |
efa2ca73 RJ |
782 | } |
783 | ||
fb50b58e RJ |
784 | /** |
785 | * doc_page_finish - Ends reading/writing of a flash page | |
786 | * @docg3: the device | |
787 | */ | |
788 | static void doc_page_finish(struct docg3 *docg3) | |
789 | { | |
790 | doc_writeb(docg3, 0, DOC_DATAEND); | |
791 | doc_delay(docg3, 2); | |
792 | } | |
793 | ||
efa2ca73 RJ |
794 | /** |
795 | * doc_read_page_finish - Ends reading of a flash page | |
796 | * @docg3: the device | |
797 | * | |
798 | * As a side effect, resets the chip selector to 0. This ensures that after each | |
799 | * read operation, the floor 0 is selected. Therefore, if the systems halts, the | |
800 | * reboot will boot on floor 0, where the IPL is. | |
801 | */ | |
802 | static void doc_read_page_finish(struct docg3 *docg3) | |
803 | { | |
fb50b58e | 804 | doc_page_finish(docg3); |
efa2ca73 RJ |
805 | doc_set_device_id(docg3, 0); |
806 | } | |
807 | ||
808 | /** | |
809 | * calc_block_sector - Calculate blocks, pages and ofs. | |
810 | ||
811 | * @from: offset in flash | |
812 | * @block0: first plane block index calculated | |
813 | * @block1: second plane block index calculated | |
814 | * @page: page calculated | |
815 | * @ofs: offset in page | |
c3de8a8a RJ |
816 | * @reliable: 0 if docg3 in normal mode, 1 if docg3 in fast mode, 2 if docg3 in |
817 | * reliable mode. | |
818 | * | |
819 | * The calculation is based on the reliable/normal mode. In normal mode, the 64 | |
820 | * pages of a block are available. In reliable mode, as pages 2*n and 2*n+1 are | |
821 | * clones, only 32 pages per block are available. | |
efa2ca73 RJ |
822 | */ |
823 | static void calc_block_sector(loff_t from, int *block0, int *block1, int *page, | |
c3de8a8a | 824 | int *ofs, int reliable) |
efa2ca73 | 825 | { |
c3de8a8a RJ |
826 | uint sector, pages_biblock; |
827 | ||
828 | pages_biblock = DOC_LAYOUT_PAGES_PER_BLOCK * DOC_LAYOUT_NBPLANES; | |
829 | if (reliable == 1 || reliable == 2) | |
830 | pages_biblock /= 2; | |
efa2ca73 RJ |
831 | |
832 | sector = from / DOC_LAYOUT_PAGE_SIZE; | |
c3de8a8a | 833 | *block0 = sector / pages_biblock * DOC_LAYOUT_NBPLANES; |
efa2ca73 | 834 | *block1 = *block0 + 1; |
c3de8a8a | 835 | *page = sector % pages_biblock; |
efa2ca73 | 836 | *page /= DOC_LAYOUT_NBPLANES; |
c3de8a8a RJ |
837 | if (reliable == 1 || reliable == 2) |
838 | *page *= 2; | |
efa2ca73 RJ |
839 | if (sector % 2) |
840 | *ofs = DOC_LAYOUT_PAGE_OOB_SIZE; | |
841 | else | |
842 | *ofs = 0; | |
843 | } | |
844 | ||
845 | /** | |
32a50b3a | 846 | * doc_read_oob - Read out of band bytes from flash |
efa2ca73 RJ |
847 | * @mtd: the device |
848 | * @from: the offset from first block and first page, in bytes, aligned on page | |
849 | * size | |
32a50b3a | 850 | * @ops: the mtd oob structure |
efa2ca73 | 851 | * |
32a50b3a | 852 | * Reads flash memory OOB area of pages. |
efa2ca73 | 853 | * |
86d2f6fb | 854 | * Returns 0 if read successful, of -EIO, -EINVAL if an error occurred |
efa2ca73 | 855 | */ |
32a50b3a RJ |
856 | static int doc_read_oob(struct mtd_info *mtd, loff_t from, |
857 | struct mtd_oob_ops *ops) | |
efa2ca73 RJ |
858 | { |
859 | struct docg3 *docg3 = mtd->priv; | |
d107bc34 | 860 | int block0, block1, page, ret, skip, ofs = 0; |
32a50b3a RJ |
861 | u8 *oobbuf = ops->oobbuf; |
862 | u8 *buf = ops->datbuf; | |
863 | size_t len, ooblen, nbdata, nboob; | |
d13d19ec | 864 | u8 hwecc[DOC_ECC_BCH_SIZE], eccconf1; |
edbc4540 | 865 | int max_bitflips = 0; |
32a50b3a RJ |
866 | |
867 | if (buf) | |
868 | len = ops->len; | |
869 | else | |
870 | len = 0; | |
871 | if (oobbuf) | |
872 | ooblen = ops->ooblen; | |
873 | else | |
874 | ooblen = 0; | |
875 | ||
876 | if (oobbuf && ops->mode == MTD_OPS_PLACE_OOB) | |
877 | oobbuf += ops->ooboffs; | |
878 | ||
879 | doc_dbg("doc_read_oob(from=%lld, mode=%d, data=(%p:%zu), oob=(%p:%zu))\n", | |
880 | from, ops->mode, buf, len, oobbuf, ooblen); | |
d107bc34 | 881 | if (ooblen % DOC_LAYOUT_OOB_SIZE) |
32a50b3a | 882 | return -EINVAL; |
efa2ca73 | 883 | |
a7baef12 RJ |
884 | if (from + len > mtd->size) |
885 | return -EINVAL; | |
efa2ca73 | 886 | |
32a50b3a RJ |
887 | ops->oobretlen = 0; |
888 | ops->retlen = 0; | |
efa2ca73 | 889 | ret = 0; |
d107bc34 | 890 | skip = from % DOC_LAYOUT_PAGE_SIZE; |
7b0e67f6 | 891 | mutex_lock(&docg3->cascade->lock); |
edbc4540 | 892 | while (ret >= 0 && (len > 0 || ooblen > 0)) { |
d107bc34 | 893 | calc_block_sector(from - skip, &block0, &block1, &page, &ofs, |
c3de8a8a | 894 | docg3->reliable); |
d107bc34 | 895 | nbdata = min_t(size_t, len, DOC_LAYOUT_PAGE_SIZE - skip); |
32a50b3a | 896 | nboob = min_t(size_t, ooblen, (size_t)DOC_LAYOUT_OOB_SIZE); |
efa2ca73 RJ |
897 | ret = doc_read_page_prepare(docg3, block0, block1, page, ofs); |
898 | if (ret < 0) | |
7b0e67f6 | 899 | goto out; |
d13d19ec | 900 | ret = doc_read_page_ecc_init(docg3, DOC_ECC_BCH_TOTAL_BYTES); |
efa2ca73 RJ |
901 | if (ret < 0) |
902 | goto err_in_read; | |
52c2d9aa | 903 | ret = doc_read_page_getbytes(docg3, skip, NULL, 1, 0); |
d107bc34 RJ |
904 | if (ret < skip) |
905 | goto err_in_read; | |
52c2d9aa | 906 | ret = doc_read_page_getbytes(docg3, nbdata, buf, 0, skip % 2); |
32a50b3a | 907 | if (ret < nbdata) |
efa2ca73 | 908 | goto err_in_read; |
d107bc34 RJ |
909 | doc_read_page_getbytes(docg3, |
910 | DOC_LAYOUT_PAGE_SIZE - nbdata - skip, | |
52c2d9aa RJ |
911 | NULL, 0, (skip + nbdata) % 2); |
912 | ret = doc_read_page_getbytes(docg3, nboob, oobbuf, 0, 0); | |
32a50b3a | 913 | if (ret < nboob) |
efa2ca73 | 914 | goto err_in_read; |
32a50b3a | 915 | doc_read_page_getbytes(docg3, DOC_LAYOUT_OOB_SIZE - nboob, |
52c2d9aa | 916 | NULL, 0, nboob % 2); |
efa2ca73 | 917 | |
b604436c | 918 | doc_get_bch_hw_ecc(docg3, hwecc); |
efa2ca73 RJ |
919 | eccconf1 = doc_register_readb(docg3, DOC_ECCCONF1); |
920 | ||
32a50b3a | 921 | if (nboob >= DOC_LAYOUT_OOB_SIZE) { |
13e85974 | 922 | doc_dbg("OOB - INFO: %*phC\n", 7, oobbuf); |
32a50b3a | 923 | doc_dbg("OOB - HAMMING: %02x\n", oobbuf[7]); |
13e85974 | 924 | doc_dbg("OOB - BCH_ECC: %*phC\n", 7, oobbuf + 8); |
32a50b3a RJ |
925 | doc_dbg("OOB - UNUSED: %02x\n", oobbuf[15]); |
926 | } | |
efa2ca73 | 927 | doc_dbg("ECC checks: ECCConf1=%x\n", eccconf1); |
13e85974 | 928 | doc_dbg("ECC HW_ECC: %*phC\n", 7, hwecc); |
d13d19ec RJ |
929 | |
930 | ret = -EIO; | |
931 | if (is_prot_seq_error(docg3)) | |
932 | goto err_in_read; | |
933 | ret = 0; | |
934 | if ((block0 >= DOC_LAYOUT_BLOCK_FIRST_DATA) && | |
935 | (eccconf1 & DOC_ECCCONF1_BCH_SYNDROM_ERR) && | |
936 | (eccconf1 & DOC_ECCCONF1_PAGE_IS_WRITTEN) && | |
937 | (ops->mode != MTD_OPS_RAW) && | |
938 | (nbdata == DOC_LAYOUT_PAGE_SIZE)) { | |
939 | ret = doc_ecc_bch_fix_data(docg3, buf, hwecc); | |
940 | if (ret < 0) { | |
941 | mtd->ecc_stats.failed++; | |
942 | ret = -EBADMSG; | |
943 | } | |
944 | if (ret > 0) { | |
945 | mtd->ecc_stats.corrected += ret; | |
edbc4540 MD |
946 | max_bitflips = max(max_bitflips, ret); |
947 | ret = max_bitflips; | |
d13d19ec | 948 | } |
efa2ca73 | 949 | } |
32a50b3a | 950 | |
efa2ca73 | 951 | doc_read_page_finish(docg3); |
32a50b3a RJ |
952 | ops->retlen += nbdata; |
953 | ops->oobretlen += nboob; | |
954 | buf += nbdata; | |
955 | oobbuf += nboob; | |
956 | len -= nbdata; | |
957 | ooblen -= nboob; | |
958 | from += DOC_LAYOUT_PAGE_SIZE; | |
d107bc34 | 959 | skip = 0; |
efa2ca73 RJ |
960 | } |
961 | ||
7b0e67f6 RJ |
962 | out: |
963 | mutex_unlock(&docg3->cascade->lock); | |
d13d19ec | 964 | return ret; |
efa2ca73 RJ |
965 | err_in_read: |
966 | doc_read_page_finish(docg3); | |
7b0e67f6 | 967 | goto out; |
efa2ca73 RJ |
968 | } |
969 | ||
970 | /** | |
32a50b3a | 971 | * doc_read - Read bytes from flash |
efa2ca73 RJ |
972 | * @mtd: the device |
973 | * @from: the offset from first block and first page, in bytes, aligned on page | |
974 | * size | |
32a50b3a RJ |
975 | * @len: the number of bytes to read (must be a multiple of 4) |
976 | * @retlen: the number of bytes actually read | |
977 | * @buf: the filled in buffer | |
efa2ca73 | 978 | * |
32a50b3a RJ |
979 | * Reads flash memory pages. This function does not read the OOB chunk, but only |
980 | * the page data. | |
efa2ca73 | 981 | * |
86d2f6fb | 982 | * Returns 0 if read successful, of -EIO, -EINVAL if an error occurred |
efa2ca73 | 983 | */ |
32a50b3a RJ |
984 | static int doc_read(struct mtd_info *mtd, loff_t from, size_t len, |
985 | size_t *retlen, u_char *buf) | |
efa2ca73 | 986 | { |
32a50b3a RJ |
987 | struct mtd_oob_ops ops; |
988 | size_t ret; | |
efa2ca73 | 989 | |
32a50b3a RJ |
990 | memset(&ops, 0, sizeof(ops)); |
991 | ops.datbuf = buf; | |
992 | ops.len = len; | |
993 | ops.mode = MTD_OPS_AUTO_OOB; | |
efa2ca73 | 994 | |
32a50b3a RJ |
995 | ret = doc_read_oob(mtd, from, &ops); |
996 | *retlen = ops.retlen; | |
997 | return ret; | |
efa2ca73 RJ |
998 | } |
999 | ||
1000 | static int doc_reload_bbt(struct docg3 *docg3) | |
1001 | { | |
1002 | int block = DOC_LAYOUT_BLOCK_BBT; | |
1003 | int ret = 0, nbpages, page; | |
1004 | u_char *buf = docg3->bbt; | |
1005 | ||
1006 | nbpages = DIV_ROUND_UP(docg3->max_block + 1, 8 * DOC_LAYOUT_PAGE_SIZE); | |
1007 | for (page = 0; !ret && (page < nbpages); page++) { | |
1008 | ret = doc_read_page_prepare(docg3, block, block + 1, | |
1009 | page + DOC_LAYOUT_PAGE_BBT, 0); | |
1010 | if (!ret) | |
1011 | ret = doc_read_page_ecc_init(docg3, | |
1012 | DOC_LAYOUT_PAGE_SIZE); | |
1013 | if (!ret) | |
1014 | doc_read_page_getbytes(docg3, DOC_LAYOUT_PAGE_SIZE, | |
52c2d9aa | 1015 | buf, 1, 0); |
efa2ca73 RJ |
1016 | buf += DOC_LAYOUT_PAGE_SIZE; |
1017 | } | |
1018 | doc_read_page_finish(docg3); | |
1019 | return ret; | |
1020 | } | |
1021 | ||
1022 | /** | |
1023 | * doc_block_isbad - Checks whether a block is good or not | |
1024 | * @mtd: the device | |
1025 | * @from: the offset to find the correct block | |
1026 | * | |
1027 | * Returns 1 if block is bad, 0 if block is good | |
1028 | */ | |
1029 | static int doc_block_isbad(struct mtd_info *mtd, loff_t from) | |
1030 | { | |
1031 | struct docg3 *docg3 = mtd->priv; | |
1032 | int block0, block1, page, ofs, is_good; | |
1033 | ||
c3de8a8a RJ |
1034 | calc_block_sector(from, &block0, &block1, &page, &ofs, |
1035 | docg3->reliable); | |
efa2ca73 RJ |
1036 | doc_dbg("doc_block_isbad(from=%lld) => block=(%d,%d), page=%d, ofs=%d\n", |
1037 | from, block0, block1, page, ofs); | |
1038 | ||
1039 | if (block0 < DOC_LAYOUT_BLOCK_FIRST_DATA) | |
1040 | return 0; | |
1041 | if (block1 > docg3->max_block) | |
1042 | return -EINVAL; | |
1043 | ||
1044 | is_good = docg3->bbt[block0 >> 3] & (1 << (block0 & 0x7)); | |
1045 | return !is_good; | |
1046 | } | |
1047 | ||
e10019bc | 1048 | #if 0 |
efa2ca73 RJ |
1049 | /** |
1050 | * doc_get_erase_count - Get block erase count | |
1051 | * @docg3: the device | |
1052 | * @from: the offset in which the block is. | |
1053 | * | |
1054 | * Get the number of times a block was erased. The number is the maximum of | |
1055 | * erase times between first and second plane (which should be equal normally). | |
1056 | * | |
1057 | * Returns The number of erases, or -EINVAL or -EIO on error. | |
1058 | */ | |
1059 | static int doc_get_erase_count(struct docg3 *docg3, loff_t from) | |
1060 | { | |
1061 | u8 buf[DOC_LAYOUT_WEAR_SIZE]; | |
1062 | int ret, plane1_erase_count, plane2_erase_count; | |
1063 | int block0, block1, page, ofs; | |
1064 | ||
1065 | doc_dbg("doc_get_erase_count(from=%lld, buf=%p)\n", from, buf); | |
1066 | if (from % DOC_LAYOUT_PAGE_SIZE) | |
1067 | return -EINVAL; | |
c3de8a8a | 1068 | calc_block_sector(from, &block0, &block1, &page, &ofs, docg3->reliable); |
efa2ca73 RJ |
1069 | if (block1 > docg3->max_block) |
1070 | return -EINVAL; | |
1071 | ||
1072 | ret = doc_reset_seq(docg3); | |
1073 | if (!ret) | |
1074 | ret = doc_read_page_prepare(docg3, block0, block1, page, | |
52c2d9aa | 1075 | ofs + DOC_LAYOUT_WEAR_OFFSET, 0); |
efa2ca73 RJ |
1076 | if (!ret) |
1077 | ret = doc_read_page_getbytes(docg3, DOC_LAYOUT_WEAR_SIZE, | |
52c2d9aa | 1078 | buf, 1, 0); |
efa2ca73 RJ |
1079 | doc_read_page_finish(docg3); |
1080 | ||
1081 | if (ret || (buf[0] != DOC_ERASE_MARK) || (buf[2] != DOC_ERASE_MARK)) | |
1082 | return -EIO; | |
1083 | plane1_erase_count = (u8)(~buf[1]) | ((u8)(~buf[4]) << 8) | |
1084 | | ((u8)(~buf[5]) << 16); | |
1085 | plane2_erase_count = (u8)(~buf[3]) | ((u8)(~buf[6]) << 8) | |
1086 | | ((u8)(~buf[7]) << 16); | |
1087 | ||
1088 | return max(plane1_erase_count, plane2_erase_count); | |
1089 | } | |
e10019bc | 1090 | #endif |
efa2ca73 | 1091 | |
fb50b58e RJ |
1092 | /** |
1093 | * doc_get_op_status - get erase/write operation status | |
1094 | * @docg3: the device | |
1095 | * | |
1096 | * Queries the status from the chip, and returns it | |
1097 | * | |
1098 | * Returns the status (bits DOC_PLANES_STATUS_*) | |
1099 | */ | |
1100 | static int doc_get_op_status(struct docg3 *docg3) | |
1101 | { | |
1102 | u8 status; | |
1103 | ||
1104 | doc_flash_sequence(docg3, DOC_SEQ_PLANES_STATUS); | |
1105 | doc_flash_command(docg3, DOC_CMD_PLANES_STATUS); | |
1106 | doc_delay(docg3, 5); | |
1107 | ||
1108 | doc_ecc_disable(docg3); | |
1109 | doc_read_data_area(docg3, &status, 1, 1); | |
1110 | return status; | |
1111 | } | |
1112 | ||
1113 | /** | |
1114 | * doc_write_erase_wait_status - wait for write or erase completion | |
1115 | * @docg3: the device | |
1116 | * | |
1117 | * Wait for the chip to be ready again after erase or write operation, and check | |
1118 | * erase/write status. | |
1119 | * | |
86d2f6fb | 1120 | * Returns 0 if erase successful, -EIO if erase/write issue, -ETIMEOUT if |
fb50b58e RJ |
1121 | * timeout |
1122 | */ | |
1123 | static int doc_write_erase_wait_status(struct docg3 *docg3) | |
1124 | { | |
a2b3d284 | 1125 | int i, status, ret = 0; |
fb50b58e | 1126 | |
a2b3d284 RJ |
1127 | for (i = 0; !doc_is_ready(docg3) && i < 5; i++) |
1128 | msleep(20); | |
fb50b58e RJ |
1129 | if (!doc_is_ready(docg3)) { |
1130 | doc_dbg("Timeout reached and the chip is still not ready\n"); | |
1131 | ret = -EAGAIN; | |
1132 | goto out; | |
1133 | } | |
1134 | ||
1135 | status = doc_get_op_status(docg3); | |
1136 | if (status & DOC_PLANES_STATUS_FAIL) { | |
1137 | doc_dbg("Erase/Write failed on (a) plane(s), status = %x\n", | |
1138 | status); | |
1139 | ret = -EIO; | |
1140 | } | |
1141 | ||
1142 | out: | |
1143 | doc_page_finish(docg3); | |
1144 | return ret; | |
1145 | } | |
1146 | ||
de03cd71 RJ |
1147 | /** |
1148 | * doc_erase_block - Erase a couple of blocks | |
1149 | * @docg3: the device | |
1150 | * @block0: the first block to erase (leftmost plane) | |
1151 | * @block1: the second block to erase (rightmost plane) | |
1152 | * | |
1153 | * Erase both blocks, and return operation status | |
1154 | * | |
1155 | * Returns 0 if erase successful, -EIO if erase issue, -ETIMEOUT if chip not | |
1156 | * ready for too long | |
1157 | */ | |
1158 | static int doc_erase_block(struct docg3 *docg3, int block0, int block1) | |
1159 | { | |
1160 | int ret, sector; | |
1161 | ||
1162 | doc_dbg("doc_erase_block(blocks=(%d,%d))\n", block0, block1); | |
1163 | ret = doc_reset_seq(docg3); | |
1164 | if (ret) | |
1165 | return -EIO; | |
1166 | ||
1167 | doc_set_reliable_mode(docg3); | |
1168 | doc_flash_sequence(docg3, DOC_SEQ_ERASE); | |
1169 | ||
1170 | sector = block0 << DOC_ADDR_BLOCK_SHIFT; | |
1171 | doc_flash_command(docg3, DOC_CMD_PROG_BLOCK_ADDR); | |
1172 | doc_setup_addr_sector(docg3, sector); | |
1173 | sector = block1 << DOC_ADDR_BLOCK_SHIFT; | |
1174 | doc_flash_command(docg3, DOC_CMD_PROG_BLOCK_ADDR); | |
1175 | doc_setup_addr_sector(docg3, sector); | |
1176 | doc_delay(docg3, 1); | |
1177 | ||
1178 | doc_flash_command(docg3, DOC_CMD_ERASECYCLE2); | |
1179 | doc_delay(docg3, 2); | |
1180 | ||
1181 | if (is_prot_seq_error(docg3)) { | |
1182 | doc_err("Erase blocks %d,%d error\n", block0, block1); | |
1183 | return -EIO; | |
1184 | } | |
1185 | ||
1186 | return doc_write_erase_wait_status(docg3); | |
1187 | } | |
1188 | ||
1189 | /** | |
1190 | * doc_erase - Erase a portion of the chip | |
1191 | * @mtd: the device | |
1192 | * @info: the erase info | |
1193 | * | |
1194 | * Erase a bunch of contiguous blocks, by pairs, as a "mtd" page of 1024 is | |
1195 | * split into 2 pages of 512 bytes on 2 contiguous blocks. | |
1196 | * | |
86d2f6fb | 1197 | * Returns 0 if erase successful, -EINVAL if addressing error, -EIO if erase |
de03cd71 RJ |
1198 | * issue |
1199 | */ | |
1200 | static int doc_erase(struct mtd_info *mtd, struct erase_info *info) | |
1201 | { | |
1202 | struct docg3 *docg3 = mtd->priv; | |
1203 | uint64_t len; | |
1204 | int block0, block1, page, ret, ofs = 0; | |
1205 | ||
1206 | doc_dbg("doc_erase(from=%lld, len=%lld\n", info->addr, info->len); | |
de03cd71 RJ |
1207 | |
1208 | info->state = MTD_ERASE_PENDING; | |
c3de8a8a RJ |
1209 | calc_block_sector(info->addr + info->len, &block0, &block1, &page, |
1210 | &ofs, docg3->reliable); | |
de03cd71 | 1211 | ret = -EINVAL; |
a7baef12 | 1212 | if (info->addr + info->len > mtd->size || page || ofs) |
de03cd71 RJ |
1213 | goto reset_err; |
1214 | ||
1215 | ret = 0; | |
c3de8a8a RJ |
1216 | calc_block_sector(info->addr, &block0, &block1, &page, &ofs, |
1217 | docg3->reliable); | |
7b0e67f6 RJ |
1218 | mutex_lock(&docg3->cascade->lock); |
1219 | doc_set_device_id(docg3, docg3->device_id); | |
de03cd71 RJ |
1220 | doc_set_reliable_mode(docg3); |
1221 | for (len = info->len; !ret && len > 0; len -= mtd->erasesize) { | |
1222 | info->state = MTD_ERASING; | |
1223 | ret = doc_erase_block(docg3, block0, block1); | |
1224 | block0 += 2; | |
1225 | block1 += 2; | |
1226 | } | |
7b0e67f6 | 1227 | mutex_unlock(&docg3->cascade->lock); |
de03cd71 RJ |
1228 | |
1229 | if (ret) | |
1230 | goto reset_err; | |
1231 | ||
1232 | info->state = MTD_ERASE_DONE; | |
1233 | return 0; | |
1234 | ||
1235 | reset_err: | |
1236 | info->state = MTD_ERASE_FAILED; | |
1237 | return ret; | |
1238 | } | |
1239 | ||
fb50b58e RJ |
1240 | /** |
1241 | * doc_write_page - Write a single page to the chip | |
1242 | * @docg3: the device | |
1243 | * @to: the offset from first block and first page, in bytes, aligned on page | |
1244 | * size | |
1245 | * @buf: buffer to get bytes from | |
1246 | * @oob: buffer to get out of band bytes from (can be NULL if no OOB should be | |
1247 | * written) | |
1248 | * @autoecc: if 0, all 16 bytes from OOB are taken, regardless of HW Hamming or | |
1249 | * BCH computations. If 1, only bytes 0-7 and byte 15 are taken, | |
1250 | * remaining ones are filled with hardware Hamming and BCH | |
1251 | * computations. Its value is not meaningfull is oob == NULL. | |
1252 | * | |
1253 | * Write one full page (ie. 1 page split on two planes), of 512 bytes, with the | |
1254 | * OOB data. The OOB ECC is automatically computed by the hardware Hamming and | |
1255 | * BCH generator if autoecc is not null. | |
1256 | * | |
1257 | * Returns 0 if write successful, -EIO if write error, -EAGAIN if timeout | |
1258 | */ | |
1259 | static int doc_write_page(struct docg3 *docg3, loff_t to, const u_char *buf, | |
1260 | const u_char *oob, int autoecc) | |
1261 | { | |
1262 | int block0, block1, page, ret, ofs = 0; | |
b604436c | 1263 | u8 hwecc[DOC_ECC_BCH_SIZE], hamming; |
fb50b58e RJ |
1264 | |
1265 | doc_dbg("doc_write_page(to=%lld)\n", to); | |
c3de8a8a | 1266 | calc_block_sector(to, &block0, &block1, &page, &ofs, docg3->reliable); |
fb50b58e RJ |
1267 | |
1268 | doc_set_device_id(docg3, docg3->device_id); | |
1269 | ret = doc_reset_seq(docg3); | |
1270 | if (ret) | |
1271 | goto err; | |
1272 | ||
1273 | /* Program the flash address block and page */ | |
1274 | ret = doc_write_seek(docg3, block0, block1, page, ofs); | |
1275 | if (ret) | |
1276 | goto err; | |
1277 | ||
d13d19ec | 1278 | doc_write_page_ecc_init(docg3, DOC_ECC_BCH_TOTAL_BYTES); |
fb50b58e RJ |
1279 | doc_delay(docg3, 2); |
1280 | doc_write_page_putbytes(docg3, DOC_LAYOUT_PAGE_SIZE, buf); | |
1281 | ||
1282 | if (oob && autoecc) { | |
1283 | doc_write_page_putbytes(docg3, DOC_LAYOUT_OOB_PAGEINFO_SZ, oob); | |
1284 | doc_delay(docg3, 2); | |
1285 | oob += DOC_LAYOUT_OOB_UNUSED_OFS; | |
1286 | ||
1287 | hamming = doc_register_readb(docg3, DOC_HAMMINGPARITY); | |
1288 | doc_delay(docg3, 2); | |
1289 | doc_write_page_putbytes(docg3, DOC_LAYOUT_OOB_HAMMING_SZ, | |
1290 | &hamming); | |
1291 | doc_delay(docg3, 2); | |
1292 | ||
b604436c RJ |
1293 | doc_get_bch_hw_ecc(docg3, hwecc); |
1294 | doc_write_page_putbytes(docg3, DOC_LAYOUT_OOB_BCH_SZ, hwecc); | |
fb50b58e RJ |
1295 | doc_delay(docg3, 2); |
1296 | ||
1297 | doc_write_page_putbytes(docg3, DOC_LAYOUT_OOB_UNUSED_SZ, oob); | |
1298 | } | |
1299 | if (oob && !autoecc) | |
1300 | doc_write_page_putbytes(docg3, DOC_LAYOUT_OOB_SIZE, oob); | |
1301 | ||
1302 | doc_delay(docg3, 2); | |
1303 | doc_page_finish(docg3); | |
1304 | doc_delay(docg3, 2); | |
1305 | doc_flash_command(docg3, DOC_CMD_PROG_CYCLE2); | |
1306 | doc_delay(docg3, 2); | |
1307 | ||
1308 | /* | |
1309 | * The wait status will perform another doc_page_finish() call, but that | |
1310 | * seems to please the docg3, so leave it. | |
1311 | */ | |
1312 | ret = doc_write_erase_wait_status(docg3); | |
1313 | return ret; | |
1314 | err: | |
1315 | doc_read_page_finish(docg3); | |
1316 | return ret; | |
1317 | } | |
1318 | ||
1319 | /** | |
1320 | * doc_guess_autoecc - Guess autoecc mode from mbd_oob_ops | |
1321 | * @ops: the oob operations | |
1322 | * | |
1323 | * Returns 0 or 1 if success, -EINVAL if invalid oob mode | |
1324 | */ | |
1325 | static int doc_guess_autoecc(struct mtd_oob_ops *ops) | |
1326 | { | |
1327 | int autoecc; | |
1328 | ||
1329 | switch (ops->mode) { | |
1330 | case MTD_OPS_PLACE_OOB: | |
1331 | case MTD_OPS_AUTO_OOB: | |
1332 | autoecc = 1; | |
1333 | break; | |
1334 | case MTD_OPS_RAW: | |
1335 | autoecc = 0; | |
1336 | break; | |
1337 | default: | |
1338 | autoecc = -EINVAL; | |
1339 | } | |
1340 | return autoecc; | |
1341 | } | |
1342 | ||
1343 | /** | |
1344 | * doc_fill_autooob - Fill a 16 bytes OOB from 8 non-ECC bytes | |
1345 | * @dst: the target 16 bytes OOB buffer | |
1346 | * @oobsrc: the source 8 bytes non-ECC OOB buffer | |
1347 | * | |
1348 | */ | |
1349 | static void doc_fill_autooob(u8 *dst, u8 *oobsrc) | |
1350 | { | |
1351 | memcpy(dst, oobsrc, DOC_LAYOUT_OOB_PAGEINFO_SZ); | |
1352 | dst[DOC_LAYOUT_OOB_UNUSED_OFS] = oobsrc[DOC_LAYOUT_OOB_PAGEINFO_SZ]; | |
1353 | } | |
1354 | ||
1355 | /** | |
1356 | * doc_backup_oob - Backup OOB into docg3 structure | |
1357 | * @docg3: the device | |
1358 | * @to: the page offset in the chip | |
1359 | * @ops: the OOB size and buffer | |
1360 | * | |
1361 | * As the docg3 should write a page with its OOB in one pass, and some userland | |
1362 | * applications do write_oob() to setup the OOB and then write(), store the OOB | |
1363 | * into a temporary storage. This is very dangerous, as 2 concurrent | |
1364 | * applications could store an OOB, and then write their pages (which will | |
1365 | * result into one having its OOB corrupted). | |
1366 | * | |
1367 | * The only reliable way would be for userland to call doc_write_oob() with both | |
1368 | * the page data _and_ the OOB area. | |
1369 | * | |
1370 | * Returns 0 if success, -EINVAL if ops content invalid | |
1371 | */ | |
1372 | static int doc_backup_oob(struct docg3 *docg3, loff_t to, | |
1373 | struct mtd_oob_ops *ops) | |
1374 | { | |
1375 | int ooblen = ops->ooblen, autoecc; | |
1376 | ||
1377 | if (ooblen != DOC_LAYOUT_OOB_SIZE) | |
1378 | return -EINVAL; | |
1379 | autoecc = doc_guess_autoecc(ops); | |
1380 | if (autoecc < 0) | |
1381 | return autoecc; | |
1382 | ||
1383 | docg3->oob_write_ofs = to; | |
1384 | docg3->oob_autoecc = autoecc; | |
1385 | if (ops->mode == MTD_OPS_AUTO_OOB) { | |
1386 | doc_fill_autooob(docg3->oob_write_buf, ops->oobbuf); | |
1387 | ops->oobretlen = 8; | |
1388 | } else { | |
1389 | memcpy(docg3->oob_write_buf, ops->oobbuf, DOC_LAYOUT_OOB_SIZE); | |
1390 | ops->oobretlen = DOC_LAYOUT_OOB_SIZE; | |
1391 | } | |
1392 | return 0; | |
1393 | } | |
1394 | ||
1395 | /** | |
1396 | * doc_write_oob - Write out of band bytes to flash | |
1397 | * @mtd: the device | |
1398 | * @ofs: the offset from first block and first page, in bytes, aligned on page | |
1399 | * size | |
1400 | * @ops: the mtd oob structure | |
1401 | * | |
1402 | * Either write OOB data into a temporary buffer, for the subsequent write | |
1403 | * page. The provided OOB should be 16 bytes long. If a data buffer is provided | |
1404 | * as well, issue the page write. | |
1405 | * Or provide data without OOB, and then a all zeroed OOB will be used (ECC will | |
1406 | * still be filled in if asked for). | |
1407 | * | |
86d2f6fb | 1408 | * Returns 0 is successful, EINVAL if length is not 14 bytes |
fb50b58e RJ |
1409 | */ |
1410 | static int doc_write_oob(struct mtd_info *mtd, loff_t ofs, | |
1411 | struct mtd_oob_ops *ops) | |
1412 | { | |
1413 | struct docg3 *docg3 = mtd->priv; | |
7b0e67f6 | 1414 | int ret, autoecc, oobdelta; |
fb50b58e RJ |
1415 | u8 *oobbuf = ops->oobbuf; |
1416 | u8 *buf = ops->datbuf; | |
1417 | size_t len, ooblen; | |
1418 | u8 oob[DOC_LAYOUT_OOB_SIZE]; | |
1419 | ||
1420 | if (buf) | |
1421 | len = ops->len; | |
1422 | else | |
1423 | len = 0; | |
1424 | if (oobbuf) | |
1425 | ooblen = ops->ooblen; | |
1426 | else | |
1427 | ooblen = 0; | |
1428 | ||
1429 | if (oobbuf && ops->mode == MTD_OPS_PLACE_OOB) | |
1430 | oobbuf += ops->ooboffs; | |
1431 | ||
1432 | doc_dbg("doc_write_oob(from=%lld, mode=%d, data=(%p:%zu), oob=(%p:%zu))\n", | |
1433 | ofs, ops->mode, buf, len, oobbuf, ooblen); | |
1434 | switch (ops->mode) { | |
1435 | case MTD_OPS_PLACE_OOB: | |
1436 | case MTD_OPS_RAW: | |
1437 | oobdelta = mtd->oobsize; | |
1438 | break; | |
1439 | case MTD_OPS_AUTO_OOB: | |
1440 | oobdelta = mtd->ecclayout->oobavail; | |
1441 | break; | |
1442 | default: | |
6c810f90 | 1443 | return -EINVAL; |
fb50b58e RJ |
1444 | } |
1445 | if ((len % DOC_LAYOUT_PAGE_SIZE) || (ooblen % oobdelta) || | |
1446 | (ofs % DOC_LAYOUT_PAGE_SIZE)) | |
1447 | return -EINVAL; | |
1448 | if (len && ooblen && | |
1449 | (len / DOC_LAYOUT_PAGE_SIZE) != (ooblen / oobdelta)) | |
1450 | return -EINVAL; | |
a7baef12 RJ |
1451 | if (ofs + len > mtd->size) |
1452 | return -EINVAL; | |
fb50b58e RJ |
1453 | |
1454 | ops->oobretlen = 0; | |
1455 | ops->retlen = 0; | |
1456 | ret = 0; | |
1457 | if (len == 0 && ooblen == 0) | |
1458 | return -EINVAL; | |
1459 | if (len == 0 && ooblen > 0) | |
1460 | return doc_backup_oob(docg3, ofs, ops); | |
1461 | ||
1462 | autoecc = doc_guess_autoecc(ops); | |
1463 | if (autoecc < 0) | |
1464 | return autoecc; | |
1465 | ||
7b0e67f6 | 1466 | mutex_lock(&docg3->cascade->lock); |
fb50b58e RJ |
1467 | while (!ret && len > 0) { |
1468 | memset(oob, 0, sizeof(oob)); | |
1469 | if (ofs == docg3->oob_write_ofs) | |
1470 | memcpy(oob, docg3->oob_write_buf, DOC_LAYOUT_OOB_SIZE); | |
1471 | else if (ooblen > 0 && ops->mode == MTD_OPS_AUTO_OOB) | |
1472 | doc_fill_autooob(oob, oobbuf); | |
1473 | else if (ooblen > 0) | |
1474 | memcpy(oob, oobbuf, DOC_LAYOUT_OOB_SIZE); | |
1475 | ret = doc_write_page(docg3, ofs, buf, oob, autoecc); | |
1476 | ||
1477 | ofs += DOC_LAYOUT_PAGE_SIZE; | |
1478 | len -= DOC_LAYOUT_PAGE_SIZE; | |
1479 | buf += DOC_LAYOUT_PAGE_SIZE; | |
1480 | if (ooblen) { | |
1481 | oobbuf += oobdelta; | |
1482 | ooblen -= oobdelta; | |
1483 | ops->oobretlen += oobdelta; | |
1484 | } | |
1485 | ops->retlen += DOC_LAYOUT_PAGE_SIZE; | |
1486 | } | |
7b0e67f6 | 1487 | |
fb50b58e | 1488 | doc_set_device_id(docg3, 0); |
7b0e67f6 | 1489 | mutex_unlock(&docg3->cascade->lock); |
fb50b58e RJ |
1490 | return ret; |
1491 | } | |
1492 | ||
1493 | /** | |
1494 | * doc_write - Write a buffer to the chip | |
1495 | * @mtd: the device | |
1496 | * @to: the offset from first block and first page, in bytes, aligned on page | |
1497 | * size | |
1498 | * @len: the number of bytes to write (must be a full page size, ie. 512) | |
1499 | * @retlen: the number of bytes actually written (0 or 512) | |
1500 | * @buf: the buffer to get bytes from | |
1501 | * | |
1502 | * Writes data to the chip. | |
1503 | * | |
1504 | * Returns 0 if write successful, -EIO if write error | |
1505 | */ | |
1506 | static int doc_write(struct mtd_info *mtd, loff_t to, size_t len, | |
1507 | size_t *retlen, const u_char *buf) | |
1508 | { | |
1509 | struct docg3 *docg3 = mtd->priv; | |
1510 | int ret; | |
1511 | struct mtd_oob_ops ops; | |
1512 | ||
1513 | doc_dbg("doc_write(to=%lld, len=%zu)\n", to, len); | |
1514 | ops.datbuf = (char *)buf; | |
1515 | ops.len = len; | |
1516 | ops.mode = MTD_OPS_PLACE_OOB; | |
1517 | ops.oobbuf = NULL; | |
1518 | ops.ooblen = 0; | |
1519 | ops.ooboffs = 0; | |
1520 | ||
1521 | ret = doc_write_oob(mtd, to, &ops); | |
1522 | *retlen = ops.retlen; | |
1523 | return ret; | |
1524 | } | |
1525 | ||
0f769d3f RJ |
1526 | static struct docg3 *sysfs_dev2docg3(struct device *dev, |
1527 | struct device_attribute *attr) | |
1528 | { | |
1529 | int floor; | |
1530 | struct platform_device *pdev = to_platform_device(dev); | |
1531 | struct mtd_info **docg3_floors = platform_get_drvdata(pdev); | |
1532 | ||
1533 | floor = attr->attr.name[1] - '0'; | |
1534 | if (floor < 0 || floor >= DOC_MAX_NBFLOORS) | |
1535 | return NULL; | |
1536 | else | |
1537 | return docg3_floors[floor]->priv; | |
1538 | } | |
1539 | ||
1540 | static ssize_t dps0_is_key_locked(struct device *dev, | |
1541 | struct device_attribute *attr, char *buf) | |
1542 | { | |
1543 | struct docg3 *docg3 = sysfs_dev2docg3(dev, attr); | |
1544 | int dps0; | |
1545 | ||
7b0e67f6 | 1546 | mutex_lock(&docg3->cascade->lock); |
0f769d3f RJ |
1547 | doc_set_device_id(docg3, docg3->device_id); |
1548 | dps0 = doc_register_readb(docg3, DOC_DPS0_STATUS); | |
1549 | doc_set_device_id(docg3, 0); | |
7b0e67f6 | 1550 | mutex_unlock(&docg3->cascade->lock); |
0f769d3f RJ |
1551 | |
1552 | return sprintf(buf, "%d\n", !(dps0 & DOC_DPS_KEY_OK)); | |
1553 | } | |
1554 | ||
1555 | static ssize_t dps1_is_key_locked(struct device *dev, | |
1556 | struct device_attribute *attr, char *buf) | |
1557 | { | |
1558 | struct docg3 *docg3 = sysfs_dev2docg3(dev, attr); | |
1559 | int dps1; | |
1560 | ||
7b0e67f6 | 1561 | mutex_lock(&docg3->cascade->lock); |
0f769d3f RJ |
1562 | doc_set_device_id(docg3, docg3->device_id); |
1563 | dps1 = doc_register_readb(docg3, DOC_DPS1_STATUS); | |
1564 | doc_set_device_id(docg3, 0); | |
7b0e67f6 | 1565 | mutex_unlock(&docg3->cascade->lock); |
0f769d3f RJ |
1566 | |
1567 | return sprintf(buf, "%d\n", !(dps1 & DOC_DPS_KEY_OK)); | |
1568 | } | |
1569 | ||
1570 | static ssize_t dps0_insert_key(struct device *dev, | |
1571 | struct device_attribute *attr, | |
1572 | const char *buf, size_t count) | |
1573 | { | |
1574 | struct docg3 *docg3 = sysfs_dev2docg3(dev, attr); | |
1575 | int i; | |
1576 | ||
1577 | if (count != DOC_LAYOUT_DPS_KEY_LENGTH) | |
1578 | return -EINVAL; | |
1579 | ||
7b0e67f6 | 1580 | mutex_lock(&docg3->cascade->lock); |
0f769d3f RJ |
1581 | doc_set_device_id(docg3, docg3->device_id); |
1582 | for (i = 0; i < DOC_LAYOUT_DPS_KEY_LENGTH; i++) | |
1583 | doc_writeb(docg3, buf[i], DOC_DPS0_KEY); | |
1584 | doc_set_device_id(docg3, 0); | |
7b0e67f6 | 1585 | mutex_unlock(&docg3->cascade->lock); |
0f769d3f RJ |
1586 | return count; |
1587 | } | |
1588 | ||
1589 | static ssize_t dps1_insert_key(struct device *dev, | |
1590 | struct device_attribute *attr, | |
1591 | const char *buf, size_t count) | |
1592 | { | |
1593 | struct docg3 *docg3 = sysfs_dev2docg3(dev, attr); | |
1594 | int i; | |
1595 | ||
1596 | if (count != DOC_LAYOUT_DPS_KEY_LENGTH) | |
1597 | return -EINVAL; | |
1598 | ||
7b0e67f6 | 1599 | mutex_lock(&docg3->cascade->lock); |
0f769d3f RJ |
1600 | doc_set_device_id(docg3, docg3->device_id); |
1601 | for (i = 0; i < DOC_LAYOUT_DPS_KEY_LENGTH; i++) | |
1602 | doc_writeb(docg3, buf[i], DOC_DPS1_KEY); | |
1603 | doc_set_device_id(docg3, 0); | |
7b0e67f6 | 1604 | mutex_unlock(&docg3->cascade->lock); |
0f769d3f RJ |
1605 | return count; |
1606 | } | |
1607 | ||
1608 | #define FLOOR_SYSFS(id) { \ | |
1609 | __ATTR(f##id##_dps0_is_keylocked, S_IRUGO, dps0_is_key_locked, NULL), \ | |
1610 | __ATTR(f##id##_dps1_is_keylocked, S_IRUGO, dps1_is_key_locked, NULL), \ | |
993bcc62 RR |
1611 | __ATTR(f##id##_dps0_protection_key, S_IWUSR|S_IWGRP, NULL, dps0_insert_key), \ |
1612 | __ATTR(f##id##_dps1_protection_key, S_IWUSR|S_IWGRP, NULL, dps1_insert_key), \ | |
0f769d3f RJ |
1613 | } |
1614 | ||
1615 | static struct device_attribute doc_sys_attrs[DOC_MAX_NBFLOORS][4] = { | |
1616 | FLOOR_SYSFS(0), FLOOR_SYSFS(1), FLOOR_SYSFS(2), FLOOR_SYSFS(3) | |
1617 | }; | |
1618 | ||
1619 | static int doc_register_sysfs(struct platform_device *pdev, | |
1b15a5f9 | 1620 | struct docg3_cascade *cascade) |
0f769d3f RJ |
1621 | { |
1622 | int ret = 0, floor, i = 0; | |
1623 | struct device *dev = &pdev->dev; | |
1624 | ||
1b15a5f9 RJ |
1625 | for (floor = 0; !ret && floor < DOC_MAX_NBFLOORS && |
1626 | cascade->floors[floor]; floor++) | |
0f769d3f RJ |
1627 | for (i = 0; !ret && i < 4; i++) |
1628 | ret = device_create_file(dev, &doc_sys_attrs[floor][i]); | |
1629 | if (!ret) | |
1630 | return 0; | |
1631 | do { | |
1632 | while (--i >= 0) | |
1633 | device_remove_file(dev, &doc_sys_attrs[floor][i]); | |
1634 | i = 4; | |
1635 | } while (--floor >= 0); | |
1636 | return ret; | |
1637 | } | |
1638 | ||
1639 | static void doc_unregister_sysfs(struct platform_device *pdev, | |
1b15a5f9 | 1640 | struct docg3_cascade *cascade) |
0f769d3f RJ |
1641 | { |
1642 | struct device *dev = &pdev->dev; | |
1643 | int floor, i; | |
1644 | ||
1b15a5f9 | 1645 | for (floor = 0; floor < DOC_MAX_NBFLOORS && cascade->floors[floor]; |
0f769d3f RJ |
1646 | floor++) |
1647 | for (i = 0; i < 4; i++) | |
1648 | device_remove_file(dev, &doc_sys_attrs[floor][i]); | |
1649 | } | |
1650 | ||
efa2ca73 RJ |
1651 | /* |
1652 | * Debug sysfs entries | |
1653 | */ | |
1654 | static int dbg_flashctrl_show(struct seq_file *s, void *p) | |
1655 | { | |
1656 | struct docg3 *docg3 = (struct docg3 *)s->private; | |
1657 | ||
1658 | int pos = 0; | |
7b0e67f6 RJ |
1659 | u8 fctrl; |
1660 | ||
1661 | mutex_lock(&docg3->cascade->lock); | |
1662 | fctrl = doc_register_readb(docg3, DOC_FLASHCONTROL); | |
1663 | mutex_unlock(&docg3->cascade->lock); | |
efa2ca73 RJ |
1664 | |
1665 | pos += seq_printf(s, | |
1666 | "FlashControl : 0x%02x (%s,CE# %s,%s,%s,flash %s)\n", | |
1667 | fctrl, | |
1668 | fctrl & DOC_CTRL_VIOLATION ? "protocol violation" : "-", | |
1669 | fctrl & DOC_CTRL_CE ? "active" : "inactive", | |
1670 | fctrl & DOC_CTRL_PROTECTION_ERROR ? "protection error" : "-", | |
1671 | fctrl & DOC_CTRL_SEQUENCE_ERROR ? "sequence error" : "-", | |
1672 | fctrl & DOC_CTRL_FLASHREADY ? "ready" : "not ready"); | |
1673 | return pos; | |
1674 | } | |
1675 | DEBUGFS_RO_ATTR(flashcontrol, dbg_flashctrl_show); | |
1676 | ||
1677 | static int dbg_asicmode_show(struct seq_file *s, void *p) | |
1678 | { | |
1679 | struct docg3 *docg3 = (struct docg3 *)s->private; | |
1680 | ||
7b0e67f6 RJ |
1681 | int pos = 0, pctrl, mode; |
1682 | ||
1683 | mutex_lock(&docg3->cascade->lock); | |
1684 | pctrl = doc_register_readb(docg3, DOC_ASICMODE); | |
1685 | mode = pctrl & 0x03; | |
1686 | mutex_unlock(&docg3->cascade->lock); | |
efa2ca73 RJ |
1687 | |
1688 | pos += seq_printf(s, | |
1689 | "%04x : RAM_WE=%d,RSTIN_RESET=%d,BDETCT_RESET=%d,WRITE_ENABLE=%d,POWERDOWN=%d,MODE=%d%d (", | |
1690 | pctrl, | |
1691 | pctrl & DOC_ASICMODE_RAM_WE ? 1 : 0, | |
1692 | pctrl & DOC_ASICMODE_RSTIN_RESET ? 1 : 0, | |
1693 | pctrl & DOC_ASICMODE_BDETCT_RESET ? 1 : 0, | |
1694 | pctrl & DOC_ASICMODE_MDWREN ? 1 : 0, | |
1695 | pctrl & DOC_ASICMODE_POWERDOWN ? 1 : 0, | |
1696 | mode >> 1, mode & 0x1); | |
1697 | ||
1698 | switch (mode) { | |
1699 | case DOC_ASICMODE_RESET: | |
6f3c0f16 | 1700 | pos += seq_puts(s, "reset"); |
efa2ca73 RJ |
1701 | break; |
1702 | case DOC_ASICMODE_NORMAL: | |
6f3c0f16 | 1703 | pos += seq_puts(s, "normal"); |
efa2ca73 RJ |
1704 | break; |
1705 | case DOC_ASICMODE_POWERDOWN: | |
6f3c0f16 | 1706 | pos += seq_puts(s, "powerdown"); |
efa2ca73 RJ |
1707 | break; |
1708 | } | |
6f3c0f16 | 1709 | pos += seq_puts(s, ")\n"); |
efa2ca73 RJ |
1710 | return pos; |
1711 | } | |
1712 | DEBUGFS_RO_ATTR(asic_mode, dbg_asicmode_show); | |
1713 | ||
1714 | static int dbg_device_id_show(struct seq_file *s, void *p) | |
1715 | { | |
1716 | struct docg3 *docg3 = (struct docg3 *)s->private; | |
1717 | int pos = 0; | |
7b0e67f6 RJ |
1718 | int id; |
1719 | ||
1720 | mutex_lock(&docg3->cascade->lock); | |
1721 | id = doc_register_readb(docg3, DOC_DEVICESELECT); | |
1722 | mutex_unlock(&docg3->cascade->lock); | |
efa2ca73 RJ |
1723 | |
1724 | pos += seq_printf(s, "DeviceId = %d\n", id); | |
1725 | return pos; | |
1726 | } | |
1727 | DEBUGFS_RO_ATTR(device_id, dbg_device_id_show); | |
1728 | ||
1729 | static int dbg_protection_show(struct seq_file *s, void *p) | |
1730 | { | |
1731 | struct docg3 *docg3 = (struct docg3 *)s->private; | |
1732 | int pos = 0; | |
dbc26d98 RJ |
1733 | int protect, dps0, dps0_low, dps0_high, dps1, dps1_low, dps1_high; |
1734 | ||
7b0e67f6 | 1735 | mutex_lock(&docg3->cascade->lock); |
dbc26d98 RJ |
1736 | protect = doc_register_readb(docg3, DOC_PROTECTION); |
1737 | dps0 = doc_register_readb(docg3, DOC_DPS0_STATUS); | |
1738 | dps0_low = doc_register_readw(docg3, DOC_DPS0_ADDRLOW); | |
1739 | dps0_high = doc_register_readw(docg3, DOC_DPS0_ADDRHIGH); | |
1740 | dps1 = doc_register_readb(docg3, DOC_DPS1_STATUS); | |
1741 | dps1_low = doc_register_readw(docg3, DOC_DPS1_ADDRLOW); | |
1742 | dps1_high = doc_register_readw(docg3, DOC_DPS1_ADDRHIGH); | |
7b0e67f6 | 1743 | mutex_unlock(&docg3->cascade->lock); |
efa2ca73 RJ |
1744 | |
1745 | pos += seq_printf(s, "Protection = 0x%02x (", | |
1746 | protect); | |
1747 | if (protect & DOC_PROTECT_FOUNDRY_OTP_LOCK) | |
6f3c0f16 | 1748 | pos += seq_puts(s, "FOUNDRY_OTP_LOCK,"); |
efa2ca73 | 1749 | if (protect & DOC_PROTECT_CUSTOMER_OTP_LOCK) |
6f3c0f16 | 1750 | pos += seq_puts(s, "CUSTOMER_OTP_LOCK,"); |
efa2ca73 | 1751 | if (protect & DOC_PROTECT_LOCK_INPUT) |
6f3c0f16 | 1752 | pos += seq_puts(s, "LOCK_INPUT,"); |
efa2ca73 | 1753 | if (protect & DOC_PROTECT_STICKY_LOCK) |
6f3c0f16 | 1754 | pos += seq_puts(s, "STICKY_LOCK,"); |
efa2ca73 | 1755 | if (protect & DOC_PROTECT_PROTECTION_ENABLED) |
6f3c0f16 | 1756 | pos += seq_puts(s, "PROTECTION ON,"); |
efa2ca73 | 1757 | if (protect & DOC_PROTECT_IPL_DOWNLOAD_LOCK) |
6f3c0f16 | 1758 | pos += seq_puts(s, "IPL_DOWNLOAD_LOCK,"); |
efa2ca73 | 1759 | if (protect & DOC_PROTECT_PROTECTION_ERROR) |
6f3c0f16 | 1760 | pos += seq_puts(s, "PROTECT_ERR,"); |
efa2ca73 | 1761 | else |
6f3c0f16 SP |
1762 | pos += seq_puts(s, "NO_PROTECT_ERR"); |
1763 | pos += seq_puts(s, ")\n"); | |
efa2ca73 RJ |
1764 | |
1765 | pos += seq_printf(s, "DPS0 = 0x%02x : " | |
1766 | "Protected area [0x%x - 0x%x] : OTP=%d, READ=%d, " | |
1767 | "WRITE=%d, HW_LOCK=%d, KEY_OK=%d\n", | |
1768 | dps0, dps0_low, dps0_high, | |
1769 | !!(dps0 & DOC_DPS_OTP_PROTECTED), | |
1770 | !!(dps0 & DOC_DPS_READ_PROTECTED), | |
1771 | !!(dps0 & DOC_DPS_WRITE_PROTECTED), | |
1772 | !!(dps0 & DOC_DPS_HW_LOCK_ENABLED), | |
1773 | !!(dps0 & DOC_DPS_KEY_OK)); | |
1774 | pos += seq_printf(s, "DPS1 = 0x%02x : " | |
1775 | "Protected area [0x%x - 0x%x] : OTP=%d, READ=%d, " | |
1776 | "WRITE=%d, HW_LOCK=%d, KEY_OK=%d\n", | |
1777 | dps1, dps1_low, dps1_high, | |
1778 | !!(dps1 & DOC_DPS_OTP_PROTECTED), | |
1779 | !!(dps1 & DOC_DPS_READ_PROTECTED), | |
1780 | !!(dps1 & DOC_DPS_WRITE_PROTECTED), | |
1781 | !!(dps1 & DOC_DPS_HW_LOCK_ENABLED), | |
1782 | !!(dps1 & DOC_DPS_KEY_OK)); | |
1783 | return pos; | |
1784 | } | |
1785 | DEBUGFS_RO_ATTR(protection, dbg_protection_show); | |
1786 | ||
1787 | static int __init doc_dbg_register(struct docg3 *docg3) | |
1788 | { | |
1789 | struct dentry *root, *entry; | |
1790 | ||
1791 | root = debugfs_create_dir("docg3", NULL); | |
1792 | if (!root) | |
1793 | return -ENOMEM; | |
1794 | ||
1795 | entry = debugfs_create_file("flashcontrol", S_IRUSR, root, docg3, | |
1796 | &flashcontrol_fops); | |
1797 | if (entry) | |
1798 | entry = debugfs_create_file("asic_mode", S_IRUSR, root, | |
1799 | docg3, &asic_mode_fops); | |
1800 | if (entry) | |
1801 | entry = debugfs_create_file("device_id", S_IRUSR, root, | |
1802 | docg3, &device_id_fops); | |
1803 | if (entry) | |
1804 | entry = debugfs_create_file("protection", S_IRUSR, root, | |
1805 | docg3, &protection_fops); | |
1806 | if (entry) { | |
1807 | docg3->debugfs_root = root; | |
1808 | return 0; | |
1809 | } else { | |
1810 | debugfs_remove_recursive(root); | |
1811 | return -ENOMEM; | |
1812 | } | |
1813 | } | |
1814 | ||
1815 | static void __exit doc_dbg_unregister(struct docg3 *docg3) | |
1816 | { | |
1817 | debugfs_remove_recursive(docg3->debugfs_root); | |
1818 | } | |
1819 | ||
1820 | /** | |
1821 | * doc_set_driver_info - Fill the mtd_info structure and docg3 structure | |
1822 | * @chip_id: The chip ID of the supported chip | |
1823 | * @mtd: The structure to fill | |
1824 | */ | |
1825 | static void __init doc_set_driver_info(int chip_id, struct mtd_info *mtd) | |
1826 | { | |
1827 | struct docg3 *docg3 = mtd->priv; | |
1828 | int cfg; | |
1829 | ||
1830 | cfg = doc_register_readb(docg3, DOC_CONFIGURATION); | |
1831 | docg3->if_cfg = (cfg & DOC_CONF_IF_CFG ? 1 : 0); | |
c3de8a8a | 1832 | docg3->reliable = reliable_mode; |
efa2ca73 RJ |
1833 | |
1834 | switch (chip_id) { | |
1835 | case DOC_CHIPID_G3: | |
31716a5a | 1836 | mtd->name = kasprintf(GFP_KERNEL, "docg3.%d", |
ae9d4934 | 1837 | docg3->device_id); |
efa2ca73 RJ |
1838 | docg3->max_block = 2047; |
1839 | break; | |
1840 | } | |
1841 | mtd->type = MTD_NANDFLASH; | |
7a7fcf14 | 1842 | mtd->flags = MTD_CAP_NANDFLASH; |
efa2ca73 | 1843 | mtd->size = (docg3->max_block + 1) * DOC_LAYOUT_BLOCK_SIZE; |
c3de8a8a RJ |
1844 | if (docg3->reliable == 2) |
1845 | mtd->size /= 2; | |
efa2ca73 | 1846 | mtd->erasesize = DOC_LAYOUT_BLOCK_SIZE * DOC_LAYOUT_NBPLANES; |
c3de8a8a RJ |
1847 | if (docg3->reliable == 2) |
1848 | mtd->erasesize /= 2; | |
82c4c58d | 1849 | mtd->writebufsize = mtd->writesize = DOC_LAYOUT_PAGE_SIZE; |
efa2ca73 RJ |
1850 | mtd->oobsize = DOC_LAYOUT_OOB_SIZE; |
1851 | mtd->owner = THIS_MODULE; | |
3c3c10bb AB |
1852 | mtd->_erase = doc_erase; |
1853 | mtd->_read = doc_read; | |
1854 | mtd->_write = doc_write; | |
1855 | mtd->_read_oob = doc_read_oob; | |
1856 | mtd->_write_oob = doc_write_oob; | |
1857 | mtd->_block_isbad = doc_block_isbad; | |
732b63bd | 1858 | mtd->ecclayout = &docg3_oobinfo; |
6a918bad | 1859 | mtd->ecc_strength = DOC_ECC_BCH_T; |
efa2ca73 RJ |
1860 | } |
1861 | ||
1862 | /** | |
ae9d4934 RJ |
1863 | * doc_probe_device - Check if a device is available |
1864 | * @base: the io space where the device is probed | |
1865 | * @floor: the floor of the probed device | |
1866 | * @dev: the device | |
1b15a5f9 | 1867 | * @cascade: the cascade of chips this devices will belong to |
efa2ca73 | 1868 | * |
ae9d4934 | 1869 | * Checks whether a device at the specified IO range, and floor is available. |
efa2ca73 | 1870 | * |
ae9d4934 RJ |
1871 | * Returns a mtd_info struct if there is a device, ENODEV if none found, ENOMEM |
1872 | * if a memory allocation failed. If floor 0 is checked, a reset of the ASIC is | |
1873 | * launched. | |
efa2ca73 | 1874 | */ |
30053b87 | 1875 | static struct mtd_info * __init |
1b15a5f9 | 1876 | doc_probe_device(struct docg3_cascade *cascade, int floor, struct device *dev) |
efa2ca73 | 1877 | { |
efa2ca73 RJ |
1878 | int ret, bbt_nbpages; |
1879 | u16 chip_id, chip_id_inv; | |
ae9d4934 RJ |
1880 | struct docg3 *docg3; |
1881 | struct mtd_info *mtd; | |
efa2ca73 RJ |
1882 | |
1883 | ret = -ENOMEM; | |
1884 | docg3 = kzalloc(sizeof(struct docg3), GFP_KERNEL); | |
1885 | if (!docg3) | |
1886 | goto nomem1; | |
1887 | mtd = kzalloc(sizeof(struct mtd_info), GFP_KERNEL); | |
1888 | if (!mtd) | |
1889 | goto nomem2; | |
1890 | mtd->priv = docg3; | |
ae9d4934 RJ |
1891 | bbt_nbpages = DIV_ROUND_UP(docg3->max_block + 1, |
1892 | 8 * DOC_LAYOUT_PAGE_SIZE); | |
1893 | docg3->bbt = kzalloc(bbt_nbpages * DOC_LAYOUT_PAGE_SIZE, GFP_KERNEL); | |
1894 | if (!docg3->bbt) | |
1895 | goto nomem3; | |
efa2ca73 | 1896 | |
ae9d4934 RJ |
1897 | docg3->dev = dev; |
1898 | docg3->device_id = floor; | |
1b15a5f9 | 1899 | docg3->cascade = cascade; |
efa2ca73 | 1900 | doc_set_device_id(docg3, docg3->device_id); |
ae9d4934 RJ |
1901 | if (!floor) |
1902 | doc_set_asic_mode(docg3, DOC_ASICMODE_RESET); | |
efa2ca73 RJ |
1903 | doc_set_asic_mode(docg3, DOC_ASICMODE_NORMAL); |
1904 | ||
1905 | chip_id = doc_register_readw(docg3, DOC_CHIPID); | |
1906 | chip_id_inv = doc_register_readw(docg3, DOC_CHIPID_INV); | |
1907 | ||
ae9d4934 | 1908 | ret = 0; |
efa2ca73 | 1909 | if (chip_id != (u16)(~chip_id_inv)) { |
ae9d4934 | 1910 | goto nomem3; |
efa2ca73 RJ |
1911 | } |
1912 | ||
1913 | switch (chip_id) { | |
1914 | case DOC_CHIPID_G3: | |
ae9d4934 | 1915 | doc_info("Found a G3 DiskOnChip at addr %p, floor %d\n", |
1b15a5f9 | 1916 | docg3->cascade->base, floor); |
efa2ca73 RJ |
1917 | break; |
1918 | default: | |
1919 | doc_err("Chip id %04x is not a DiskOnChip G3 chip\n", chip_id); | |
ae9d4934 | 1920 | goto nomem3; |
efa2ca73 RJ |
1921 | } |
1922 | ||
1923 | doc_set_driver_info(chip_id, mtd); | |
efa2ca73 | 1924 | |
fb50b58e | 1925 | doc_hamming_ecc_init(docg3, DOC_LAYOUT_OOB_PAGEINFO_SZ); |
efa2ca73 | 1926 | doc_reload_bbt(docg3); |
ae9d4934 | 1927 | return mtd; |
efa2ca73 | 1928 | |
ae9d4934 | 1929 | nomem3: |
efa2ca73 RJ |
1930 | kfree(mtd); |
1931 | nomem2: | |
1932 | kfree(docg3); | |
1933 | nomem1: | |
ae9d4934 RJ |
1934 | return ERR_PTR(ret); |
1935 | } | |
1936 | ||
1937 | /** | |
1938 | * doc_release_device - Release a docg3 floor | |
1939 | * @mtd: the device | |
1940 | */ | |
1941 | static void doc_release_device(struct mtd_info *mtd) | |
1942 | { | |
1943 | struct docg3 *docg3 = mtd->priv; | |
1944 | ||
1945 | mtd_device_unregister(mtd); | |
1946 | kfree(docg3->bbt); | |
1947 | kfree(docg3); | |
1948 | kfree(mtd->name); | |
1949 | kfree(mtd); | |
1950 | } | |
1951 | ||
e4b2a96a RJ |
1952 | /** |
1953 | * docg3_resume - Awakens docg3 floor | |
1954 | * @pdev: platfrom device | |
1955 | * | |
86d2f6fb | 1956 | * Returns 0 (always successful) |
e4b2a96a RJ |
1957 | */ |
1958 | static int docg3_resume(struct platform_device *pdev) | |
1959 | { | |
1960 | int i; | |
1b15a5f9 | 1961 | struct docg3_cascade *cascade; |
e4b2a96a RJ |
1962 | struct mtd_info **docg3_floors, *mtd; |
1963 | struct docg3 *docg3; | |
1964 | ||
1b15a5f9 RJ |
1965 | cascade = platform_get_drvdata(pdev); |
1966 | docg3_floors = cascade->floors; | |
e4b2a96a RJ |
1967 | mtd = docg3_floors[0]; |
1968 | docg3 = mtd->priv; | |
1969 | ||
1970 | doc_dbg("docg3_resume()\n"); | |
1971 | for (i = 0; i < 12; i++) | |
1972 | doc_readb(docg3, DOC_IOSPACE_IPL); | |
1973 | return 0; | |
1974 | } | |
1975 | ||
1976 | /** | |
1977 | * docg3_suspend - Put in low power mode the docg3 floor | |
1978 | * @pdev: platform device | |
1979 | * @state: power state | |
1980 | * | |
1981 | * Shuts off most of docg3 circuitery to lower power consumption. | |
1982 | * | |
1983 | * Returns 0 if suspend succeeded, -EIO if chip refused suspend | |
1984 | */ | |
1985 | static int docg3_suspend(struct platform_device *pdev, pm_message_t state) | |
1986 | { | |
1987 | int floor, i; | |
1b15a5f9 | 1988 | struct docg3_cascade *cascade; |
e4b2a96a RJ |
1989 | struct mtd_info **docg3_floors, *mtd; |
1990 | struct docg3 *docg3; | |
1991 | u8 ctrl, pwr_down; | |
1992 | ||
1b15a5f9 RJ |
1993 | cascade = platform_get_drvdata(pdev); |
1994 | docg3_floors = cascade->floors; | |
e4b2a96a RJ |
1995 | for (floor = 0; floor < DOC_MAX_NBFLOORS; floor++) { |
1996 | mtd = docg3_floors[floor]; | |
1997 | if (!mtd) | |
1998 | continue; | |
1999 | docg3 = mtd->priv; | |
2000 | ||
2001 | doc_writeb(docg3, floor, DOC_DEVICESELECT); | |
2002 | ctrl = doc_register_readb(docg3, DOC_FLASHCONTROL); | |
2003 | ctrl &= ~DOC_CTRL_VIOLATION & ~DOC_CTRL_CE; | |
2004 | doc_writeb(docg3, ctrl, DOC_FLASHCONTROL); | |
2005 | ||
2006 | for (i = 0; i < 10; i++) { | |
2007 | usleep_range(3000, 4000); | |
2008 | pwr_down = doc_register_readb(docg3, DOC_POWERMODE); | |
2009 | if (pwr_down & DOC_POWERDOWN_READY) | |
2010 | break; | |
2011 | } | |
2012 | if (pwr_down & DOC_POWERDOWN_READY) { | |
2013 | doc_dbg("docg3_suspend(): floor %d powerdown ok\n", | |
2014 | floor); | |
2015 | } else { | |
2016 | doc_err("docg3_suspend(): floor %d powerdown failed\n", | |
2017 | floor); | |
2018 | return -EIO; | |
2019 | } | |
2020 | } | |
2021 | ||
2022 | mtd = docg3_floors[0]; | |
2023 | docg3 = mtd->priv; | |
2024 | doc_set_asic_mode(docg3, DOC_ASICMODE_POWERDOWN); | |
2025 | return 0; | |
2026 | } | |
2027 | ||
ae9d4934 RJ |
2028 | /** |
2029 | * doc_probe - Probe the IO space for a DiskOnChip G3 chip | |
2030 | * @pdev: platform device | |
2031 | * | |
2032 | * Probes for a G3 chip at the specified IO space in the platform data | |
2033 | * ressources. The floor 0 must be available. | |
2034 | * | |
2035 | * Returns 0 on success, -ENOMEM, -ENXIO on error | |
2036 | */ | |
2037 | static int __init docg3_probe(struct platform_device *pdev) | |
2038 | { | |
2039 | struct device *dev = &pdev->dev; | |
2040 | struct mtd_info *mtd; | |
2041 | struct resource *ress; | |
2042 | void __iomem *base; | |
2043 | int ret, floor, found = 0; | |
1b15a5f9 | 2044 | struct docg3_cascade *cascade; |
ae9d4934 RJ |
2045 | |
2046 | ret = -ENXIO; | |
2047 | ress = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
2048 | if (!ress) { | |
2049 | dev_err(dev, "No I/O memory resource defined\n"); | |
82402aeb | 2050 | return ret; |
ae9d4934 | 2051 | } |
82402aeb | 2052 | base = devm_ioremap(dev, ress->start, DOC_IOSPACE_SIZE); |
ae9d4934 RJ |
2053 | |
2054 | ret = -ENOMEM; | |
82402aeb JH |
2055 | cascade = devm_kzalloc(dev, sizeof(*cascade) * DOC_MAX_NBFLOORS, |
2056 | GFP_KERNEL); | |
1b15a5f9 | 2057 | if (!cascade) |
82402aeb | 2058 | return ret; |
1b15a5f9 | 2059 | cascade->base = base; |
7b0e67f6 | 2060 | mutex_init(&cascade->lock); |
1b15a5f9 | 2061 | cascade->bch = init_bch(DOC_ECC_BCH_M, DOC_ECC_BCH_T, |
d13d19ec | 2062 | DOC_ECC_BCH_PRIMPOLY); |
1b15a5f9 | 2063 | if (!cascade->bch) |
82402aeb | 2064 | return ret; |
ae9d4934 | 2065 | |
ae9d4934 | 2066 | for (floor = 0; floor < DOC_MAX_NBFLOORS; floor++) { |
1b15a5f9 | 2067 | mtd = doc_probe_device(cascade, floor, dev); |
b49e345e | 2068 | if (IS_ERR(mtd)) { |
ae9d4934 | 2069 | ret = PTR_ERR(mtd); |
b49e345e DC |
2070 | goto err_probe; |
2071 | } | |
2072 | if (!mtd) { | |
2073 | if (floor == 0) | |
2074 | goto notfound; | |
2075 | else | |
2076 | continue; | |
2077 | } | |
1b15a5f9 | 2078 | cascade->floors[floor] = mtd; |
b49e345e DC |
2079 | ret = mtd_device_parse_register(mtd, part_probes, NULL, NULL, |
2080 | 0); | |
ae9d4934 RJ |
2081 | if (ret) |
2082 | goto err_probe; | |
b49e345e | 2083 | found++; |
ae9d4934 RJ |
2084 | } |
2085 | ||
1b15a5f9 | 2086 | ret = doc_register_sysfs(pdev, cascade); |
0f769d3f RJ |
2087 | if (ret) |
2088 | goto err_probe; | |
ae9d4934 RJ |
2089 | if (!found) |
2090 | goto notfound; | |
2091 | ||
1b15a5f9 RJ |
2092 | platform_set_drvdata(pdev, cascade); |
2093 | doc_dbg_register(cascade->floors[0]->priv); | |
ae9d4934 RJ |
2094 | return 0; |
2095 | ||
2096 | notfound: | |
2097 | ret = -ENODEV; | |
2098 | dev_info(dev, "No supported DiskOnChip found\n"); | |
2099 | err_probe: | |
39ac9ca3 | 2100 | free_bch(cascade->bch); |
ae9d4934 | 2101 | for (floor = 0; floor < DOC_MAX_NBFLOORS; floor++) |
1b15a5f9 RJ |
2102 | if (cascade->floors[floor]) |
2103 | doc_release_device(cascade->floors[floor]); | |
efa2ca73 RJ |
2104 | return ret; |
2105 | } | |
2106 | ||
2107 | /** | |
2108 | * docg3_release - Release the driver | |
2109 | * @pdev: the platform device | |
2110 | * | |
2111 | * Returns 0 | |
2112 | */ | |
2113 | static int __exit docg3_release(struct platform_device *pdev) | |
2114 | { | |
1b15a5f9 RJ |
2115 | struct docg3_cascade *cascade = platform_get_drvdata(pdev); |
2116 | struct docg3 *docg3 = cascade->floors[0]->priv; | |
ae9d4934 | 2117 | int floor; |
efa2ca73 | 2118 | |
1b15a5f9 | 2119 | doc_unregister_sysfs(pdev, cascade); |
efa2ca73 | 2120 | doc_dbg_unregister(docg3); |
ae9d4934 | 2121 | for (floor = 0; floor < DOC_MAX_NBFLOORS; floor++) |
1b15a5f9 RJ |
2122 | if (cascade->floors[floor]) |
2123 | doc_release_device(cascade->floors[floor]); | |
ae9d4934 | 2124 | |
1b15a5f9 | 2125 | free_bch(docg3->cascade->bch); |
efa2ca73 RJ |
2126 | return 0; |
2127 | } | |
2128 | ||
2129 | static struct platform_driver g3_driver = { | |
2130 | .driver = { | |
2131 | .name = "docg3", | |
2132 | .owner = THIS_MODULE, | |
2133 | }, | |
e4b2a96a RJ |
2134 | .suspend = docg3_suspend, |
2135 | .resume = docg3_resume, | |
efa2ca73 RJ |
2136 | .remove = __exit_p(docg3_release), |
2137 | }; | |
2138 | ||
725a2277 | 2139 | module_platform_driver_probe(g3_driver, docg3_probe); |
efa2ca73 RJ |
2140 | |
2141 | MODULE_LICENSE("GPL"); | |
2142 | MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@free.fr>"); | |
2143 | MODULE_DESCRIPTION("MTD driver for DiskOnChip G3"); |