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Kyungmin Parke29c22f2008-11-19 16:20:36 +01001/*
2 * Simple MTD partitioning layer
3 *
4 * (C) 2000 Nicolas Pitre <nico@cam.org>
5 *
6 * This code is GPL
7 *
8 * 02-21-2002 Thomas Gleixner <gleixner@autronix.de>
9 * added support for read_oob, write_oob
10 */
11
12#include <common.h>
13#include <malloc.h>
14#include <asm/errno.h>
15
16#include <linux/types.h>
17#include <linux/list.h>
18#include <linux/mtd/mtd.h>
19#include <linux/mtd/partitions.h>
20#include <linux/mtd/compat.h>
21
22/* Our partition linked list */
Stefan Roese9def12c2008-11-27 14:05:15 +010023struct list_head mtd_partitions;
Kyungmin Parke29c22f2008-11-19 16:20:36 +010024
25/* Our partition node structure */
26struct mtd_part {
27 struct mtd_info mtd;
28 struct mtd_info *master;
Stefan Roese8d2effe2009-05-11 16:03:55 +020029 uint64_t offset;
Kyungmin Parke29c22f2008-11-19 16:20:36 +010030 int index;
31 struct list_head list;
32 int registered;
33};
34
35/*
36 * Given a pointer to the MTD object in the mtd_part structure, we can retrieve
37 * the pointer to that structure with this macro.
38 */
39#define PART(x) ((struct mtd_part *)(x))
40
41
42/*
43 * MTD methods which simply translate the effective address and pass through
44 * to the _real_ device.
45 */
46
Stefan Roese8d2effe2009-05-11 16:03:55 +020047static int part_read(struct mtd_info *mtd, loff_t from, size_t len,
48 size_t *retlen, u_char *buf)
Kyungmin Parke29c22f2008-11-19 16:20:36 +010049{
50 struct mtd_part *part = PART(mtd);
Stefan Roese8d2effe2009-05-11 16:03:55 +020051 struct mtd_ecc_stats stats;
Kyungmin Parke29c22f2008-11-19 16:20:36 +010052 int res;
53
Stefan Roese8d2effe2009-05-11 16:03:55 +020054 stats = part->master->ecc_stats;
55
Kyungmin Parke29c22f2008-11-19 16:20:36 +010056 if (from >= mtd->size)
57 len = 0;
58 else if (from + len > mtd->size)
59 len = mtd->size - from;
Stefan Roese8d2effe2009-05-11 16:03:55 +020060 res = part->master->read(part->master, from + part->offset,
Kyungmin Parke29c22f2008-11-19 16:20:36 +010061 len, retlen, buf);
62 if (unlikely(res)) {
63 if (res == -EUCLEAN)
Stefan Roese8d2effe2009-05-11 16:03:55 +020064 mtd->ecc_stats.corrected += part->master->ecc_stats.corrected - stats.corrected;
Kyungmin Parke29c22f2008-11-19 16:20:36 +010065 if (res == -EBADMSG)
Stefan Roese8d2effe2009-05-11 16:03:55 +020066 mtd->ecc_stats.failed += part->master->ecc_stats.failed - stats.failed;
Kyungmin Parke29c22f2008-11-19 16:20:36 +010067 }
68 return res;
69}
70
Kyungmin Parke29c22f2008-11-19 16:20:36 +010071static int part_read_oob(struct mtd_info *mtd, loff_t from,
Stefan Roese8d2effe2009-05-11 16:03:55 +020072 struct mtd_oob_ops *ops)
Kyungmin Parke29c22f2008-11-19 16:20:36 +010073{
74 struct mtd_part *part = PART(mtd);
75 int res;
76
77 if (from >= mtd->size)
78 return -EINVAL;
79 if (ops->datbuf && from + ops->len > mtd->size)
80 return -EINVAL;
81 res = part->master->read_oob(part->master, from + part->offset, ops);
82
83 if (unlikely(res)) {
84 if (res == -EUCLEAN)
85 mtd->ecc_stats.corrected++;
86 if (res == -EBADMSG)
87 mtd->ecc_stats.failed++;
88 }
89 return res;
90}
91
Stefan Roese8d2effe2009-05-11 16:03:55 +020092static int part_read_user_prot_reg(struct mtd_info *mtd, loff_t from,
93 size_t len, size_t *retlen, u_char *buf)
Kyungmin Parke29c22f2008-11-19 16:20:36 +010094{
95 struct mtd_part *part = PART(mtd);
Stefan Roese8d2effe2009-05-11 16:03:55 +020096 return part->master->read_user_prot_reg(part->master, from,
Kyungmin Parke29c22f2008-11-19 16:20:36 +010097 len, retlen, buf);
98}
99
Stefan Roese8d2effe2009-05-11 16:03:55 +0200100static int part_get_user_prot_info(struct mtd_info *mtd,
101 struct otp_info *buf, size_t len)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100102{
103 struct mtd_part *part = PART(mtd);
Stefan Roese8d2effe2009-05-11 16:03:55 +0200104 return part->master->get_user_prot_info(part->master, buf, len);
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100105}
106
Stefan Roese8d2effe2009-05-11 16:03:55 +0200107static int part_read_fact_prot_reg(struct mtd_info *mtd, loff_t from,
108 size_t len, size_t *retlen, u_char *buf)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100109{
110 struct mtd_part *part = PART(mtd);
Stefan Roese8d2effe2009-05-11 16:03:55 +0200111 return part->master->read_fact_prot_reg(part->master, from,
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100112 len, retlen, buf);
113}
114
Stefan Roese8d2effe2009-05-11 16:03:55 +0200115static int part_get_fact_prot_info(struct mtd_info *mtd, struct otp_info *buf,
116 size_t len)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100117{
118 struct mtd_part *part = PART(mtd);
Stefan Roese8d2effe2009-05-11 16:03:55 +0200119 return part->master->get_fact_prot_info(part->master, buf, len);
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100120}
121
Stefan Roese8d2effe2009-05-11 16:03:55 +0200122static int part_write(struct mtd_info *mtd, loff_t to, size_t len,
123 size_t *retlen, const u_char *buf)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100124{
125 struct mtd_part *part = PART(mtd);
126 if (!(mtd->flags & MTD_WRITEABLE))
127 return -EROFS;
128 if (to >= mtd->size)
129 len = 0;
130 else if (to + len > mtd->size)
131 len = mtd->size - to;
Stefan Roese8d2effe2009-05-11 16:03:55 +0200132 return part->master->write(part->master, to + part->offset,
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100133 len, retlen, buf);
134}
135
Stefan Roese8d2effe2009-05-11 16:03:55 +0200136static int part_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
137 size_t *retlen, const u_char *buf)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100138{
139 struct mtd_part *part = PART(mtd);
140 if (!(mtd->flags & MTD_WRITEABLE))
141 return -EROFS;
142 if (to >= mtd->size)
143 len = 0;
144 else if (to + len > mtd->size)
145 len = mtd->size - to;
Stefan Roese8d2effe2009-05-11 16:03:55 +0200146 return part->master->panic_write(part->master, to + part->offset,
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100147 len, retlen, buf);
148}
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100149
150static int part_write_oob(struct mtd_info *mtd, loff_t to,
Stefan Roese8d2effe2009-05-11 16:03:55 +0200151 struct mtd_oob_ops *ops)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100152{
153 struct mtd_part *part = PART(mtd);
154
155 if (!(mtd->flags & MTD_WRITEABLE))
156 return -EROFS;
157
158 if (to >= mtd->size)
159 return -EINVAL;
160 if (ops->datbuf && to + ops->len > mtd->size)
161 return -EINVAL;
162 return part->master->write_oob(part->master, to + part->offset, ops);
163}
164
Stefan Roese8d2effe2009-05-11 16:03:55 +0200165static int part_write_user_prot_reg(struct mtd_info *mtd, loff_t from,
166 size_t len, size_t *retlen, u_char *buf)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100167{
168 struct mtd_part *part = PART(mtd);
Stefan Roese8d2effe2009-05-11 16:03:55 +0200169 return part->master->write_user_prot_reg(part->master, from,
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100170 len, retlen, buf);
171}
172
Stefan Roese8d2effe2009-05-11 16:03:55 +0200173static int part_lock_user_prot_reg(struct mtd_info *mtd, loff_t from,
174 size_t len)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100175{
176 struct mtd_part *part = PART(mtd);
Stefan Roese8d2effe2009-05-11 16:03:55 +0200177 return part->master->lock_user_prot_reg(part->master, from, len);
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100178}
179
Stefan Roese8d2effe2009-05-11 16:03:55 +0200180static int part_erase(struct mtd_info *mtd, struct erase_info *instr)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100181{
182 struct mtd_part *part = PART(mtd);
183 int ret;
184 if (!(mtd->flags & MTD_WRITEABLE))
185 return -EROFS;
186 if (instr->addr >= mtd->size)
187 return -EINVAL;
188 instr->addr += part->offset;
189 ret = part->master->erase(part->master, instr);
190 if (ret) {
Stefan Roese8d2effe2009-05-11 16:03:55 +0200191 if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100192 instr->fail_addr -= part->offset;
193 instr->addr -= part->offset;
194 }
195 return ret;
196}
197
198void mtd_erase_callback(struct erase_info *instr)
199{
200 if (instr->mtd->erase == part_erase) {
201 struct mtd_part *part = PART(instr->mtd);
202
Stefan Roese8d2effe2009-05-11 16:03:55 +0200203 if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100204 instr->fail_addr -= part->offset;
205 instr->addr -= part->offset;
206 }
207 if (instr->callback)
208 instr->callback(instr);
209}
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100210
Stefan Roese8d2effe2009-05-11 16:03:55 +0200211static int part_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100212{
213 struct mtd_part *part = PART(mtd);
214 if ((len + ofs) > mtd->size)
215 return -EINVAL;
216 return part->master->lock(part->master, ofs + part->offset, len);
217}
218
Stefan Roese8d2effe2009-05-11 16:03:55 +0200219static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100220{
221 struct mtd_part *part = PART(mtd);
222 if ((len + ofs) > mtd->size)
223 return -EINVAL;
224 return part->master->unlock(part->master, ofs + part->offset, len);
225}
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100226
227static void part_sync(struct mtd_info *mtd)
228{
229 struct mtd_part *part = PART(mtd);
230 part->master->sync(part->master);
231}
232
Stefan Roese8d2effe2009-05-11 16:03:55 +0200233static int part_block_isbad(struct mtd_info *mtd, loff_t ofs)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100234{
235 struct mtd_part *part = PART(mtd);
236 if (ofs >= mtd->size)
237 return -EINVAL;
238 ofs += part->offset;
239 return part->master->block_isbad(part->master, ofs);
240}
241
Stefan Roese8d2effe2009-05-11 16:03:55 +0200242static int part_block_markbad(struct mtd_info *mtd, loff_t ofs)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100243{
244 struct mtd_part *part = PART(mtd);
245 int res;
246
247 if (!(mtd->flags & MTD_WRITEABLE))
248 return -EROFS;
249 if (ofs >= mtd->size)
250 return -EINVAL;
251 ofs += part->offset;
252 res = part->master->block_markbad(part->master, ofs);
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100253 if (!res)
254 mtd->ecc_stats.badblocks++;
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100255 return res;
256}
257
258/*
259 * This function unregisters and destroy all slave MTD objects which are
260 * attached to the given master MTD object.
261 */
262
263int del_mtd_partitions(struct mtd_info *master)
264{
Stefan Roese8d2effe2009-05-11 16:03:55 +0200265 struct mtd_part *slave, *next;
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100266
Stefan Roese8d2effe2009-05-11 16:03:55 +0200267 list_for_each_entry_safe(slave, next, &mtd_partitions, list)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100268 if (slave->master == master) {
Stefan Roese8d2effe2009-05-11 16:03:55 +0200269 list_del(&slave->list);
270 if (slave->registered)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100271 del_mtd_device(&slave->mtd);
272 kfree(slave);
Stefan Roese8d2effe2009-05-11 16:03:55 +0200273 }
274
275 return 0;
276}
277
278static struct mtd_part *add_one_partition(struct mtd_info *master,
279 const struct mtd_partition *part, int partno,
280 uint64_t cur_offset)
281{
282 struct mtd_part *slave;
283
284 /* allocate the partition structure */
285 slave = kzalloc(sizeof(*slave), GFP_KERNEL);
286 if (!slave) {
287 printk(KERN_ERR"memory allocation error while creating partitions for \"%s\"\n",
288 master->name);
289 del_mtd_partitions(master);
290 return NULL;
291 }
292 list_add(&slave->list, &mtd_partitions);
293
294 /* set up the MTD object for this partition */
295 slave->mtd.type = master->type;
296 slave->mtd.flags = master->flags & ~part->mask_flags;
297 slave->mtd.size = part->size;
298 slave->mtd.writesize = master->writesize;
299 slave->mtd.oobsize = master->oobsize;
300 slave->mtd.oobavail = master->oobavail;
301 slave->mtd.subpage_sft = master->subpage_sft;
302
303 slave->mtd.name = part->name;
304 slave->mtd.owner = master->owner;
305
306 slave->mtd.read = part_read;
307 slave->mtd.write = part_write;
308
309 if (master->panic_write)
310 slave->mtd.panic_write = part_panic_write;
311
312 if (master->read_oob)
313 slave->mtd.read_oob = part_read_oob;
314 if (master->write_oob)
315 slave->mtd.write_oob = part_write_oob;
316 if (master->read_user_prot_reg)
317 slave->mtd.read_user_prot_reg = part_read_user_prot_reg;
318 if (master->read_fact_prot_reg)
319 slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg;
320 if (master->write_user_prot_reg)
321 slave->mtd.write_user_prot_reg = part_write_user_prot_reg;
322 if (master->lock_user_prot_reg)
323 slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg;
324 if (master->get_user_prot_info)
325 slave->mtd.get_user_prot_info = part_get_user_prot_info;
326 if (master->get_fact_prot_info)
327 slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
328 if (master->sync)
329 slave->mtd.sync = part_sync;
Stefan Roese8d2effe2009-05-11 16:03:55 +0200330 if (master->lock)
331 slave->mtd.lock = part_lock;
332 if (master->unlock)
333 slave->mtd.unlock = part_unlock;
334 if (master->block_isbad)
335 slave->mtd.block_isbad = part_block_isbad;
336 if (master->block_markbad)
337 slave->mtd.block_markbad = part_block_markbad;
338 slave->mtd.erase = part_erase;
339 slave->master = master;
340 slave->offset = part->offset;
341 slave->index = partno;
342
343 if (slave->offset == MTDPART_OFS_APPEND)
344 slave->offset = cur_offset;
345 if (slave->offset == MTDPART_OFS_NXTBLK) {
346 slave->offset = cur_offset;
347 if (mtd_mod_by_eb(cur_offset, master) != 0) {
348 /* Round up to next erasesize */
349 slave->offset = (mtd_div_by_eb(cur_offset, master) + 1) * master->erasesize;
350 printk(KERN_NOTICE "Moving partition %d: "
351 "0x%012llx -> 0x%012llx\n", partno,
352 (unsigned long long)cur_offset, (unsigned long long)slave->offset);
353 }
354 }
355 if (slave->mtd.size == MTDPART_SIZ_FULL)
356 slave->mtd.size = master->size - slave->offset;
357
358 printk(KERN_NOTICE "0x%012llx-0x%012llx : \"%s\"\n", (unsigned long long)slave->offset,
359 (unsigned long long)(slave->offset + slave->mtd.size), slave->mtd.name);
360
361 /* let's do some sanity checks */
362 if (slave->offset >= master->size) {
363 /* let's register it anyway to preserve ordering */
364 slave->offset = 0;
365 slave->mtd.size = 0;
366 printk(KERN_ERR"mtd: partition \"%s\" is out of reach -- disabled\n",
367 part->name);
368 goto out_register;
369 }
370 if (slave->offset + slave->mtd.size > master->size) {
371 slave->mtd.size = master->size - slave->offset;
372 printk(KERN_WARNING"mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#llx\n",
373 part->name, master->name, (unsigned long long)slave->mtd.size);
374 }
375 if (master->numeraseregions > 1) {
376 /* Deal with variable erase size stuff */
377 int i, max = master->numeraseregions;
378 u64 end = slave->offset + slave->mtd.size;
379 struct mtd_erase_region_info *regions = master->eraseregions;
380
381 /* Find the first erase regions which is part of this
382 * partition. */
383 for (i = 0; i < max && regions[i].offset <= slave->offset; i++)
384 ;
385 /* The loop searched for the region _behind_ the first one */
386 i--;
387
388 /* Pick biggest erasesize */
389 for (; i < max && regions[i].offset < end; i++) {
390 if (slave->mtd.erasesize < regions[i].erasesize) {
391 slave->mtd.erasesize = regions[i].erasesize;
392 }
393 }
394 BUG_ON(slave->mtd.erasesize == 0);
395 } else {
396 /* Single erase size */
397 slave->mtd.erasesize = master->erasesize;
398 }
399
400 if ((slave->mtd.flags & MTD_WRITEABLE) &&
401 mtd_mod_by_eb(slave->offset, &slave->mtd)) {
402 /* Doesn't start on a boundary of major erase size */
403 /* FIXME: Let it be writable if it is on a boundary of
404 * _minor_ erase size though */
405 slave->mtd.flags &= ~MTD_WRITEABLE;
406 printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
407 part->name);
408 }
409 if ((slave->mtd.flags & MTD_WRITEABLE) &&
410 mtd_mod_by_eb(slave->mtd.size, &slave->mtd)) {
411 slave->mtd.flags &= ~MTD_WRITEABLE;
412 printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
413 part->name);
414 }
415
416 slave->mtd.ecclayout = master->ecclayout;
417 if (master->block_isbad) {
418 uint64_t offs = 0;
419
420 while (offs < slave->mtd.size) {
421 if (master->block_isbad(master,
422 offs + slave->offset))
423 slave->mtd.ecc_stats.badblocks++;
424 offs += slave->mtd.erasesize;
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100425 }
426 }
427
Stefan Roese8d2effe2009-05-11 16:03:55 +0200428out_register:
429 if (part->mtdp) {
430 /* store the object pointer (caller may or may not register it*/
431 *part->mtdp = &slave->mtd;
432 slave->registered = 0;
433 } else {
434 /* register our partition */
435 add_mtd_device(&slave->mtd);
436 slave->registered = 1;
437 }
438 return slave;
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100439}
440
441/*
442 * This function, given a master MTD object and a partition table, creates
443 * and registers slave MTD objects which are bound to the master according to
444 * the partition definitions.
Stefan Roese8d2effe2009-05-11 16:03:55 +0200445 *
446 * We don't register the master, or expect the caller to have done so,
447 * for reasons of data integrity.
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100448 */
449
450int add_mtd_partitions(struct mtd_info *master,
451 const struct mtd_partition *parts,
452 int nbparts)
453{
454 struct mtd_part *slave;
Stefan Roese8d2effe2009-05-11 16:03:55 +0200455 uint64_t cur_offset = 0;
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100456 int i;
457
Stefan Roese9def12c2008-11-27 14:05:15 +0100458 /*
459 * Need to init the list here, since LIST_INIT() does not
460 * work on platforms where relocation has problems (like MIPS
461 * & PPC).
462 */
463 if (mtd_partitions.next == NULL)
464 INIT_LIST_HEAD(&mtd_partitions);
465
Stefan Roese8d2effe2009-05-11 16:03:55 +0200466 printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100467
468 for (i = 0; i < nbparts; i++) {
Stefan Roese8d2effe2009-05-11 16:03:55 +0200469 slave = add_one_partition(master, parts + i, i, cur_offset);
470 if (!slave)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100471 return -ENOMEM;
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100472 cur_offset = slave->offset + slave->mtd.size;
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100473 }
474
475 return 0;
476}