Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

Linux/drivers/mtd/devices/docg3.c

  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>
 32 #include <linux/bitmap.h>
 33 #include <linux/bitrev.h>
 34 #include <linux/bch.h>
 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 :
 47  *  - IPL write
 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
 55  * The BCH ECC is :
 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 
 64 static unsigned int reliable_mode;
 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 
 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 
 83 static inline u8 doc_readb(struct docg3 *docg3, u16 reg)
 84 {
 85         u8 val = readb(docg3->cascade->base + reg);
 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 {
 93         u16 val = readw(docg3->cascade->base + reg);
 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 {
101         writeb(val, docg3->cascade->base + reg);
102         trace_docg3_io(1, 8, reg, val);
103 }
104 
105 static inline void doc_writew(struct docg3 *docg3, u16 val, u16 reg)
106 {
107         writew(val, docg3->cascade->base + reg);
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 
126 static char const * const part_probes[] = { "cmdlinepart", "saftlpart", NULL };
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 
163         doc_vdbg("NOP x %d\n", nbNOPs);
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
216  * @buf: the buffer to fill in (might be NULL is dummy reads)
217  * @len: the length to read
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);
230         cdr = len & 0x1;
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);
238                 if (dst16) {
239                         *dst16 = data16;
240                         dst16++;
241                 }
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);
251                         if (dst8) {
252                                 *dst8 = data8;
253                                 dst8++;
254                         }
255                 }
256         }
257 }
258 
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 
293 /**
294  * doc_set_data_mode - Sets the flash to normal or reliable data mode
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.
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).
307  */
308 static void doc_set_reliable_mode(struct docg3 *docg3)
309 {
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         }
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  *
386  * Returns 0 if no error occurred, -EIO else.
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 
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 
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 
471         doc_flash_sequence(docg3, DOC_SEQ_READ);
472         sector = (block0 << DOC_ADDR_BLOCK_SHIFT) + (page & DOC_ADDR_PAGE_MASK);
473         doc_flash_command(docg3, DOC_CMD_PROG_BLOCK_ADDR);
474         doc_setup_addr_sector(docg3, sector);
475 
476         sector = (block1 << DOC_ADDR_BLOCK_SHIFT) + (page & DOC_ADDR_PAGE_MASK);
477         doc_flash_command(docg3, DOC_CMD_PROG_BLOCK_ADDR);
478         doc_setup_addr_sector(docg3, sector);
479         doc_delay(docg3, 1);
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);
523         doc_delay(docg3, 2);
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);
532 
533 out:
534         return ret;
535 }
536 
537 
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
544  * ECC (on 1 byte) and the BCH hardware ECC (on 7 bytes).
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 
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
565  * ECC (on 1 byte) and the BCH hardware ECC (on 7 bytes).
566  *
567  * Return 0 if succeeded, -EIO on error
568  */
569 static int doc_write_page_ecc_init(struct docg3 *docg3, int len)
570 {
571         doc_writew(docg3, DOC_ECCCONF0_WRITE_MODE
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 
611 /**
612  * doc_ecc_bch_fix_data - Fix if need be read data from flash
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]);
641         numerrs = decode_bch(docg3->cascade->bch, NULL,
642                              DOC_ECC_BCH_COVERED_BYTES,
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 
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  *
684  * Returns 0 if successful, -EIO if a read error occurred.
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)
733  * @buf: the buffer to be filled in (or NULL is forget bytes)
734  * @first: 1 if first time read, DOC_READADDRESS should be set
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.
742  *
743  */
744 static int doc_read_page_getbytes(struct docg3 *docg3, int len, u_char *buf,
745                                   int first, int last_odd)
746 {
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         }
753         doc_delay(docg3, 2);
754         return len;
755 }
756 
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 
771 /**
772  * doc_get_bch_hw_ecc - Get hardware calculated BCH ECC
773  * @docg3: the device
774  * @hwecc:  the array of 7 integers where the hardware ecc will be stored
775  */
776 static void doc_get_bch_hw_ecc(struct docg3 *docg3, u8 *hwecc)
777 {
778         int i;
779 
780         for (i = 0; i < DOC_ECC_BCH_SIZE; i++)
781                 hwecc[i] = doc_register_readb(docg3, DOC_BCH_HW_ECC(i));
782 }
783 
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 
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 {
804         doc_page_finish(docg3);
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
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.
822  */
823 static void calc_block_sector(loff_t from, int *block0, int *block1, int *page,
824                               int *ofs, int reliable)
825 {
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;
831 
832         sector = from / DOC_LAYOUT_PAGE_SIZE;
833         *block0 = sector / pages_biblock * DOC_LAYOUT_NBPLANES;
834         *block1 = *block0 + 1;
835         *page = sector % pages_biblock;
836         *page /= DOC_LAYOUT_NBPLANES;
837         if (reliable == 1 || reliable == 2)
838                 *page *= 2;
839         if (sector % 2)
840                 *ofs = DOC_LAYOUT_PAGE_OOB_SIZE;
841         else
842                 *ofs = 0;
843 }
844 
845 /**
846  * doc_read_oob - Read out of band bytes from flash
847  * @mtd: the device
848  * @from: the offset from first block and first page, in bytes, aligned on page
849  *        size
850  * @ops: the mtd oob structure
851  *
852  * Reads flash memory OOB area of pages.
853  *
854  * Returns 0 if read successful, of -EIO, -EINVAL if an error occurred
855  */
856 static int doc_read_oob(struct mtd_info *mtd, loff_t from,
857                         struct mtd_oob_ops *ops)
858 {
859         struct docg3 *docg3 = mtd->priv;
860         int block0, block1, page, ret, skip, ofs = 0;
861         u8 *oobbuf = ops->oobbuf;
862         u8 *buf = ops->datbuf;
863         size_t len, ooblen, nbdata, nboob;
864         u8 hwecc[DOC_ECC_BCH_SIZE], eccconf1;
865         int max_bitflips = 0;
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);
881         if (ooblen % DOC_LAYOUT_OOB_SIZE)
882                 return -EINVAL;
883 
884         if (from + len > mtd->size)
885                 return -EINVAL;
886 
887         ops->oobretlen = 0;
888         ops->retlen = 0;
889         ret = 0;
890         skip = from % DOC_LAYOUT_PAGE_SIZE;
891         mutex_lock(&docg3->cascade->lock);
892         while (ret >= 0 && (len > 0 || ooblen > 0)) {
893                 calc_block_sector(from - skip, &block0, &block1, &page, &ofs,
894                         docg3->reliable);
895                 nbdata = min_t(size_t, len, DOC_LAYOUT_PAGE_SIZE - skip);
896                 nboob = min_t(size_t, ooblen, (size_t)DOC_LAYOUT_OOB_SIZE);
897                 ret = doc_read_page_prepare(docg3, block0, block1, page, ofs);
898                 if (ret < 0)
899                         goto out;
900                 ret = doc_read_page_ecc_init(docg3, DOC_ECC_BCH_TOTAL_BYTES);
901                 if (ret < 0)
902                         goto err_in_read;
903                 ret = doc_read_page_getbytes(docg3, skip, NULL, 1, 0);
904                 if (ret < skip)
905                         goto err_in_read;
906                 ret = doc_read_page_getbytes(docg3, nbdata, buf, 0, skip % 2);
907                 if (ret < nbdata)
908                         goto err_in_read;
909                 doc_read_page_getbytes(docg3,
910                                        DOC_LAYOUT_PAGE_SIZE - nbdata - skip,
911                                        NULL, 0, (skip + nbdata) % 2);
912                 ret = doc_read_page_getbytes(docg3, nboob, oobbuf, 0, 0);
913                 if (ret < nboob)
914                         goto err_in_read;
915                 doc_read_page_getbytes(docg3, DOC_LAYOUT_OOB_SIZE - nboob,
916                                        NULL, 0, nboob % 2);
917 
918                 doc_get_bch_hw_ecc(docg3, hwecc);
919                 eccconf1 = doc_register_readb(docg3, DOC_ECCCONF1);
920 
921                 if (nboob >= DOC_LAYOUT_OOB_SIZE) {
922                         doc_dbg("OOB - INFO: %*phC\n", 7, oobbuf);
923                         doc_dbg("OOB - HAMMING: %02x\n", oobbuf[7]);
924                         doc_dbg("OOB - BCH_ECC: %*phC\n", 7, oobbuf + 8);
925                         doc_dbg("OOB - UNUSED: %02x\n", oobbuf[15]);
926                 }
927                 doc_dbg("ECC checks: ECCConf1=%x\n", eccconf1);
928                 doc_dbg("ECC HW_ECC: %*phC\n", 7, hwecc);
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;
946                                 max_bitflips = max(max_bitflips, ret);
947                                 ret = max_bitflips;
948                         }
949                 }
950 
951                 doc_read_page_finish(docg3);
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;
959                 skip = 0;
960         }
961 
962 out:
963         mutex_unlock(&docg3->cascade->lock);
964         return ret;
965 err_in_read:
966         doc_read_page_finish(docg3);
967         goto out;
968 }
969 
970 /**
971  * doc_read - Read bytes from flash
972  * @mtd: the device
973  * @from: the offset from first block and first page, in bytes, aligned on page
974  *        size
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
978  *
979  * Reads flash memory pages. This function does not read the OOB chunk, but only
980  * the page data.
981  *
982  * Returns 0 if read successful, of -EIO, -EINVAL if an error occurred
983  */
984 static int doc_read(struct mtd_info *mtd, loff_t from, size_t len,
985              size_t *retlen, u_char *buf)
986 {
987         struct mtd_oob_ops ops;
988         size_t ret;
989 
990         memset(&ops, 0, sizeof(ops));
991         ops.datbuf = buf;
992         ops.len = len;
993         ops.mode = MTD_OPS_AUTO_OOB;
994 
995         ret = doc_read_oob(mtd, from, &ops);
996         *retlen = ops.retlen;
997         return ret;
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,
1015                                                buf, 1, 0);
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 
1034         calc_block_sector(from, &block0, &block1, &page, &ofs,
1035                 docg3->reliable);
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 
1048 #if 0
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;
1068         calc_block_sector(from, &block0, &block1, &page, &ofs, docg3->reliable);
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,
1075                                             ofs + DOC_LAYOUT_WEAR_OFFSET, 0);
1076         if (!ret)
1077                 ret = doc_read_page_getbytes(docg3, DOC_LAYOUT_WEAR_SIZE,
1078                                              buf, 1, 0);
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 }
1090 #endif
1091 
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  *
1120  * Returns 0 if erase successful, -EIO if erase/write issue, -ETIMEOUT if
1121  * timeout
1122  */
1123 static int doc_write_erase_wait_status(struct docg3 *docg3)
1124 {
1125         int i, status, ret = 0;
1126 
1127         for (i = 0; !doc_is_ready(docg3) && i < 5; i++)
1128                 msleep(20);
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 
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  *
1197  * Returns 0 if erase successful, -EINVAL if addressing error, -EIO if erase
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);
1207 
1208         info->state = MTD_ERASE_PENDING;
1209         calc_block_sector(info->addr + info->len, &block0, &block1, &page,
1210                           &ofs, docg3->reliable);
1211         ret = -EINVAL;
1212         if (info->addr + info->len > mtd->size || page || ofs)
1213                 goto reset_err;
1214 
1215         ret = 0;
1216         calc_block_sector(info->addr, &block0, &block1, &page, &ofs,
1217                           docg3->reliable);
1218         mutex_lock(&docg3->cascade->lock);
1219         doc_set_device_id(docg3, docg3->device_id);
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         }
1227         mutex_unlock(&docg3->cascade->lock);
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 
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;
1263         u8 hwecc[DOC_ECC_BCH_SIZE], hamming;
1264 
1265         doc_dbg("doc_write_page(to=%lld)\n", to);
1266         calc_block_sector(to, &block0, &block1, &page, &ofs, docg3->reliable);
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 
1278         doc_write_page_ecc_init(docg3, DOC_ECC_BCH_TOTAL_BYTES);
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 
1293                 doc_get_bch_hw_ecc(docg3, hwecc);
1294                 doc_write_page_putbytes(docg3, DOC_LAYOUT_OOB_BCH_SZ, hwecc);
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  *
1408  * Returns 0 is successful, EINVAL if length is not 14 bytes
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;
1414         int ret, autoecc, oobdelta;
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:
1443                 return -EINVAL;
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;
1451         if (ofs + len > mtd->size)
1452                 return -EINVAL;
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 
1466         mutex_lock(&docg3->cascade->lock);
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         }
1487 
1488         doc_set_device_id(docg3, 0);
1489         mutex_unlock(&docg3->cascade->lock);
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 
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] - '';
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 
1546         mutex_lock(&docg3->cascade->lock);
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);
1550         mutex_unlock(&docg3->cascade->lock);
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 
1561         mutex_lock(&docg3->cascade->lock);
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);
1565         mutex_unlock(&docg3->cascade->lock);
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 
1580         mutex_lock(&docg3->cascade->lock);
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);
1585         mutex_unlock(&docg3->cascade->lock);
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 
1599         mutex_lock(&docg3->cascade->lock);
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);
1604         mutex_unlock(&docg3->cascade->lock);
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), \
1611         __ATTR(f##id##_dps0_protection_key, S_IWUGO, NULL, dps0_insert_key), \
1612         __ATTR(f##id##_dps1_protection_key, S_IWUGO, NULL, dps1_insert_key), \
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,
1620                               struct docg3_cascade *cascade)
1621 {
1622         int ret = 0, floor, i = 0;
1623         struct device *dev = &pdev->dev;
1624 
1625         for (floor = 0; !ret && floor < DOC_MAX_NBFLOORS &&
1626                      cascade->floors[floor]; floor++)
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,
1640                                  struct docg3_cascade *cascade)
1641 {
1642         struct device *dev = &pdev->dev;
1643         int floor, i;
1644 
1645         for (floor = 0; floor < DOC_MAX_NBFLOORS && cascade->floors[floor];
1646              floor++)
1647                 for (i = 0; i < 4; i++)
1648                         device_remove_file(dev, &doc_sys_attrs[floor][i]);
1649 }
1650 
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;
1659         u8 fctrl;
1660 
1661         mutex_lock(&docg3->cascade->lock);
1662         fctrl = doc_register_readb(docg3, DOC_FLASHCONTROL);
1663         mutex_unlock(&docg3->cascade->lock);
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 
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);
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:
1700                 pos += seq_printf(s, "reset");
1701                 break;
1702         case DOC_ASICMODE_NORMAL:
1703                 pos += seq_printf(s, "normal");
1704                 break;
1705         case DOC_ASICMODE_POWERDOWN:
1706                 pos += seq_printf(s, "powerdown");
1707                 break;
1708         }
1709         pos += seq_printf(s, ")\n");
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;
1718         int id;
1719 
1720         mutex_lock(&docg3->cascade->lock);
1721         id = doc_register_readb(docg3, DOC_DEVICESELECT);
1722         mutex_unlock(&docg3->cascade->lock);
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;
1733         int protect, dps0, dps0_low, dps0_high, dps1, dps1_low, dps1_high;
1734 
1735         mutex_lock(&docg3->cascade->lock);
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);
1743         mutex_unlock(&docg3->cascade->lock);
1744 
1745         pos += seq_printf(s, "Protection = 0x%02x (",
1746                          protect);
1747         if (protect & DOC_PROTECT_FOUNDRY_OTP_LOCK)
1748                 pos += seq_printf(s, "FOUNDRY_OTP_LOCK,");
1749         if (protect & DOC_PROTECT_CUSTOMER_OTP_LOCK)
1750                 pos += seq_printf(s, "CUSTOMER_OTP_LOCK,");
1751         if (protect & DOC_PROTECT_LOCK_INPUT)
1752                 pos += seq_printf(s, "LOCK_INPUT,");
1753         if (protect & DOC_PROTECT_STICKY_LOCK)
1754                 pos += seq_printf(s, "STICKY_LOCK,");
1755         if (protect & DOC_PROTECT_PROTECTION_ENABLED)
1756                 pos += seq_printf(s, "PROTECTION ON,");
1757         if (protect & DOC_PROTECT_IPL_DOWNLOAD_LOCK)
1758                 pos += seq_printf(s, "IPL_DOWNLOAD_LOCK,");
1759         if (protect & DOC_PROTECT_PROTECTION_ERROR)
1760                 pos += seq_printf(s, "PROTECT_ERR,");
1761         else
1762                 pos += seq_printf(s, "NO_PROTECT_ERR");
1763         pos += seq_printf(s, ")\n");
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);
1832         docg3->reliable = reliable_mode;
1833 
1834         switch (chip_id) {
1835         case DOC_CHIPID_G3:
1836                 mtd->name = kasprintf(GFP_KERNEL, "docg3.%d",
1837                                       docg3->device_id);
1838                 docg3->max_block = 2047;
1839                 break;
1840         }
1841         mtd->type = MTD_NANDFLASH;
1842         mtd->flags = MTD_CAP_NANDFLASH;
1843         mtd->size = (docg3->max_block + 1) * DOC_LAYOUT_BLOCK_SIZE;
1844         if (docg3->reliable == 2)
1845                 mtd->size /= 2;
1846         mtd->erasesize = DOC_LAYOUT_BLOCK_SIZE * DOC_LAYOUT_NBPLANES;
1847         if (docg3->reliable == 2)
1848                 mtd->erasesize /= 2;
1849         mtd->writebufsize = mtd->writesize = DOC_LAYOUT_PAGE_SIZE;
1850         mtd->oobsize = DOC_LAYOUT_OOB_SIZE;
1851         mtd->owner = THIS_MODULE;
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;
1858         mtd->ecclayout = &docg3_oobinfo;
1859         mtd->ecc_strength = DOC_ECC_BCH_T;
1860 }
1861 
1862 /**
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
1867  * @cascade: the cascade of chips this devices will belong to
1868  *
1869  * Checks whether a device at the specified IO range, and floor is available.
1870  *
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.
1874  */
1875 static struct mtd_info * __init
1876 doc_probe_device(struct docg3_cascade *cascade, int floor, struct device *dev)
1877 {
1878         int ret, bbt_nbpages;
1879         u16 chip_id, chip_id_inv;
1880         struct docg3 *docg3;
1881         struct mtd_info *mtd;
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;
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;
1896 
1897         docg3->dev = dev;
1898         docg3->device_id = floor;
1899         docg3->cascade = cascade;
1900         doc_set_device_id(docg3, docg3->device_id);
1901         if (!floor)
1902                 doc_set_asic_mode(docg3, DOC_ASICMODE_RESET);
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 
1908         ret = 0;
1909         if (chip_id != (u16)(~chip_id_inv)) {
1910                 goto nomem3;
1911         }
1912 
1913         switch (chip_id) {
1914         case DOC_CHIPID_G3:
1915                 doc_info("Found a G3 DiskOnChip at addr %p, floor %d\n",
1916                          docg3->cascade->base, floor);
1917                 break;
1918         default:
1919                 doc_err("Chip id %04x is not a DiskOnChip G3 chip\n", chip_id);
1920                 goto nomem3;
1921         }
1922 
1923         doc_set_driver_info(chip_id, mtd);
1924 
1925         doc_hamming_ecc_init(docg3, DOC_LAYOUT_OOB_PAGEINFO_SZ);
1926         doc_reload_bbt(docg3);
1927         return mtd;
1928 
1929 nomem3:
1930         kfree(mtd);
1931 nomem2:
1932         kfree(docg3);
1933 nomem1:
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 
1952 /**
1953  * docg3_resume - Awakens docg3 floor
1954  * @pdev: platfrom device
1955  *
1956  * Returns 0 (always successful)
1957  */
1958 static int docg3_resume(struct platform_device *pdev)
1959 {
1960         int i;
1961         struct docg3_cascade *cascade;
1962         struct mtd_info **docg3_floors, *mtd;
1963         struct docg3 *docg3;
1964 
1965         cascade = platform_get_drvdata(pdev);
1966         docg3_floors = cascade->floors;
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;
1988         struct docg3_cascade *cascade;
1989         struct mtd_info **docg3_floors, *mtd;
1990         struct docg3 *docg3;
1991         u8 ctrl, pwr_down;
1992 
1993         cascade = platform_get_drvdata(pdev);
1994         docg3_floors = cascade->floors;
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 
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;
2044         struct docg3_cascade *cascade;
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");
2050                 return ret;
2051         }
2052         base = devm_ioremap(dev, ress->start, DOC_IOSPACE_SIZE);
2053 
2054         ret = -ENOMEM;
2055         cascade = devm_kzalloc(dev, sizeof(*cascade) * DOC_MAX_NBFLOORS,
2056                                GFP_KERNEL);
2057         if (!cascade)
2058                 return ret;
2059         cascade->base = base;
2060         mutex_init(&cascade->lock);
2061         cascade->bch = init_bch(DOC_ECC_BCH_M, DOC_ECC_BCH_T,
2062                              DOC_ECC_BCH_PRIMPOLY);
2063         if (!cascade->bch)
2064                 return ret;
2065 
2066         for (floor = 0; floor < DOC_MAX_NBFLOORS; floor++) {
2067                 mtd = doc_probe_device(cascade, floor, dev);
2068                 if (IS_ERR(mtd)) {
2069                         ret = PTR_ERR(mtd);
2070                         goto err_probe;
2071                 }
2072                 if (!mtd) {
2073                         if (floor == 0)
2074                                 goto notfound;
2075                         else
2076                                 continue;
2077                 }
2078                 cascade->floors[floor] = mtd;
2079                 ret = mtd_device_parse_register(mtd, part_probes, NULL, NULL,
2080                                                 0);
2081                 if (ret)
2082                         goto err_probe;
2083                 found++;
2084         }
2085 
2086         ret = doc_register_sysfs(pdev, cascade);
2087         if (ret)
2088                 goto err_probe;
2089         if (!found)
2090                 goto notfound;
2091 
2092         platform_set_drvdata(pdev, cascade);
2093         doc_dbg_register(cascade->floors[0]->priv);
2094         return 0;
2095 
2096 notfound:
2097         ret = -ENODEV;
2098         dev_info(dev, "No supported DiskOnChip found\n");
2099 err_probe:
2100         free_bch(cascade->bch);
2101         for (floor = 0; floor < DOC_MAX_NBFLOORS; floor++)
2102                 if (cascade->floors[floor])
2103                         doc_release_device(cascade->floors[floor]);
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 {
2115         struct docg3_cascade *cascade = platform_get_drvdata(pdev);
2116         struct docg3 *docg3 = cascade->floors[0]->priv;
2117         int floor;
2118 
2119         doc_unregister_sysfs(pdev, cascade);
2120         doc_dbg_unregister(docg3);
2121         for (floor = 0; floor < DOC_MAX_NBFLOORS; floor++)
2122                 if (cascade->floors[floor])
2123                         doc_release_device(cascade->floors[floor]);
2124 
2125         free_bch(docg3->cascade->bch);
2126         return 0;
2127 }
2128 
2129 static struct platform_driver g3_driver = {
2130         .driver         = {
2131                 .name   = "docg3",
2132                 .owner  = THIS_MODULE,
2133         },
2134         .suspend        = docg3_suspend,
2135         .resume         = docg3_resume,
2136         .remove         = __exit_p(docg3_release),
2137 };
2138 
2139 module_platform_driver_probe(g3_driver, docg3_probe);
2140 
2141 MODULE_LICENSE("GPL");
2142 MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@free.fr>");
2143 MODULE_DESCRIPTION("MTD driver for DiskOnChip G3");
2144 

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