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15#include <linux/module.h>
16#include <linux/types.h>
17#include <linux/kernel.h>
18#include <linux/init.h>
19#include <linux/slab.h>
20
21#include <linux/mtd/concat.h>
22#include <linux/mtd/map.h>
23#include <linux/mtd/mtd.h>
24#include <linux/mtd/mtdram.h>
25#include <linux/mtd/partitions.h>
26
27#include <asm/axisflashmap.h>
28#include <asm/mmu.h>
29
30#define MEM_CSE0_SIZE (0x04000000)
31#define MEM_CSE1_SIZE (0x04000000)
32
33#define FLASH_UNCACHED_ADDR KSEG_E
34#define FLASH_CACHED_ADDR KSEG_F
35
36#define PAGESIZE (512)
37
38#if CONFIG_ETRAX_FLASH_BUSWIDTH==1
39#define flash_data __u8
40#elif CONFIG_ETRAX_FLASH_BUSWIDTH==2
41#define flash_data __u16
42#elif CONFIG_ETRAX_FLASH_BUSWIDTH==4
43#define flash_data __u32
44#endif
45
46
47extern unsigned long romfs_in_flash;
48extern unsigned long romfs_start, romfs_length;
49extern unsigned long nand_boot;
50
51struct partition_name {
52 char name[6];
53};
54
55
56struct mtd_info* axisflash_mtd = NULL;
57
58
59
60static map_word flash_read(struct map_info *map, unsigned long ofs)
61{
62 map_word tmp;
63 tmp.x[0] = *(flash_data *)(map->map_priv_1 + ofs);
64 return tmp;
65}
66
67static void flash_copy_from(struct map_info *map, void *to,
68 unsigned long from, ssize_t len)
69{
70 memcpy(to, (void *)(map->map_priv_1 + from), len);
71}
72
73static void flash_write(struct map_info *map, map_word d, unsigned long adr)
74{
75 *(flash_data *)(map->map_priv_1 + adr) = (flash_data)d.x[0];
76}
77
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91
92
93static struct map_info map_cse0 = {
94 .name = "cse0",
95 .size = MEM_CSE0_SIZE,
96 .bankwidth = CONFIG_ETRAX_FLASH_BUSWIDTH,
97 .read = flash_read,
98 .copy_from = flash_copy_from,
99 .write = flash_write,
100 .map_priv_1 = FLASH_UNCACHED_ADDR
101};
102
103
104
105
106
107
108
109static struct map_info map_cse1 = {
110 .name = "cse1",
111 .size = MEM_CSE1_SIZE,
112 .bankwidth = CONFIG_ETRAX_FLASH_BUSWIDTH,
113 .read = flash_read,
114 .copy_from = flash_copy_from,
115 .write = flash_write,
116 .map_priv_1 = FLASH_UNCACHED_ADDR + MEM_CSE0_SIZE
117};
118
119#define MAX_PARTITIONS 7
120#ifdef CONFIG_ETRAX_NANDBOOT
121#define NUM_DEFAULT_PARTITIONS 4
122#define DEFAULT_ROOTFS_PARTITION_NO 2
123#define DEFAULT_MEDIA_SIZE 0x2000000
124#else
125#define NUM_DEFAULT_PARTITIONS 3
126#define DEFAULT_ROOTFS_PARTITION_NO (-1)
127#define DEFAULT_MEDIA_SIZE 0x800000
128#endif
129
130#if (MAX_PARTITIONS < NUM_DEFAULT_PARTITIONS)
131#error MAX_PARTITIONS must be >= than NUM_DEFAULT_PARTITIONS
132#endif
133
134
135static struct mtd_partition axis_partitions[MAX_PARTITIONS] = {
136 {
137 .name = "part0",
138 .size = CONFIG_ETRAX_PTABLE_SECTOR,
139 .offset = 0
140 },
141 {
142 .name = "part1",
143 .size = 0,
144 .offset = 0
145 },
146 {
147 .name = "part2",
148 .size = 0,
149 .offset = 0
150 },
151 {
152 .name = "part3",
153 .size = 0,
154 .offset = 0
155 },
156 {
157 .name = "part4",
158 .size = 0,
159 .offset = 0
160 },
161 {
162 .name = "part5",
163 .size = 0,
164 .offset = 0
165 },
166 {
167 .name = "part6",
168 .size = 0,
169 .offset = 0
170 },
171};
172
173
174
175
176
177
178
179static struct mtd_partition axis_default_partitions[NUM_DEFAULT_PARTITIONS] = {
180 {
181 .name = "boot firmware",
182 .size = CONFIG_ETRAX_PTABLE_SECTOR,
183 .offset = 0
184 },
185 {
186 .name = "kernel",
187 .size = 10 * CONFIG_ETRAX_PTABLE_SECTOR,
188 .offset = CONFIG_ETRAX_PTABLE_SECTOR
189 },
190#define FILESYSTEM_SECTOR (11 * CONFIG_ETRAX_PTABLE_SECTOR)
191#ifdef CONFIG_ETRAX_NANDBOOT
192 {
193 .name = "rootfs",
194 .size = 10 * CONFIG_ETRAX_PTABLE_SECTOR,
195 .offset = FILESYSTEM_SECTOR
196 },
197#undef FILESYSTEM_SECTOR
198#define FILESYSTEM_SECTOR (21 * CONFIG_ETRAX_PTABLE_SECTOR)
199#endif
200 {
201 .name = "rwfs",
202 .size = DEFAULT_MEDIA_SIZE - FILESYSTEM_SECTOR,
203 .offset = FILESYSTEM_SECTOR
204 }
205};
206
207#ifdef CONFIG_ETRAX_AXISFLASHMAP_MTD0WHOLE
208
209static struct mtd_partition main_partition = {
210 .name = "main",
211 .size = 0,
212 .offset = 0
213};
214#endif
215
216
217static struct mtd_partition aux_partition = {
218 .name = "aux",
219 .size = 0,
220 .offset = 0
221};
222
223
224
225
226
227static struct mtd_info *probe_cs(struct map_info *map_cs)
228{
229 struct mtd_info *mtd_cs = NULL;
230
231 printk(KERN_INFO
232 "%s: Probing a 0x%08lx bytes large window at 0x%08lx.\n",
233 map_cs->name, map_cs->size, map_cs->map_priv_1);
234
235#ifdef CONFIG_MTD_CFI
236 mtd_cs = do_map_probe("cfi_probe", map_cs);
237#endif
238#ifdef CONFIG_MTD_JEDECPROBE
239 if (!mtd_cs)
240 mtd_cs = do_map_probe("jedec_probe", map_cs);
241#endif
242
243 return mtd_cs;
244}
245
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254
255
256extern struct mtd_info* __init crisv32_nand_flash_probe (void);
257static struct mtd_info *flash_probe(void)
258{
259 struct mtd_info *mtd_cse0;
260 struct mtd_info *mtd_cse1;
261 struct mtd_info *mtd_total;
262 struct mtd_info *mtds[2];
263 int count = 0;
264
265 if ((mtd_cse0 = probe_cs(&map_cse0)) != NULL)
266 mtds[count++] = mtd_cse0;
267 if ((mtd_cse1 = probe_cs(&map_cse1)) != NULL)
268 mtds[count++] = mtd_cse1;
269
270 if (!mtd_cse0 && !mtd_cse1) {
271
272 return NULL;
273 }
274
275 if (count > 1) {
276
277
278
279
280
281
282
283 mtd_total = mtd_concat_create(mtds, count, "cse0+cse1");
284 if (!mtd_total) {
285 printk(KERN_ERR "%s and %s: Concatenation failed!\n",
286 map_cse0.name, map_cse1.name);
287
288
289
290 mtd_total = mtd_cse0;
291 map_destroy(mtd_cse1);
292 }
293 } else
294 mtd_total = mtd_cse0 ? mtd_cse0 : mtd_cse1;
295
296 return mtd_total;
297}
298
299
300
301
302
303static int __init init_axis_flash(void)
304{
305 struct mtd_info *main_mtd;
306 struct mtd_info *aux_mtd = NULL;
307 int err = 0;
308 int pidx = 0;
309 struct partitiontable_head *ptable_head = NULL;
310 struct partitiontable_entry *ptable;
311 int ptable_ok = 0;
312 static char page[PAGESIZE];
313 size_t len;
314 int ram_rootfs_partition = -1;
315 int part;
316 struct mtd_partition *partition;
317
318
319
320
321
322
323#if !defined(CONFIG_MTD_MTDRAM) || (CONFIG_MTDRAM_TOTAL_SIZE != 0) || (CONFIG_MTDRAM_ABS_POS != 0)
324 if (!romfs_in_flash && !nand_boot) {
325 printk(KERN_EMERG "axisflashmap: Cannot create an MTD RAM "
326 "device; configure CONFIG_MTD_MTDRAM with size = 0!\n");
327 panic("This kernel cannot boot from RAM!\n");
328 }
329#endif
330
331 main_mtd = flash_probe();
332 if (main_mtd)
333 printk(KERN_INFO "%s: 0x%08llx bytes of NOR flash memory.\n",
334 main_mtd->name, main_mtd->size);
335
336#ifdef CONFIG_ETRAX_NANDFLASH
337 aux_mtd = crisv32_nand_flash_probe();
338 if (aux_mtd)
339 printk(KERN_INFO "%s: 0x%08x bytes of NAND flash memory.\n",
340 aux_mtd->name, aux_mtd->size);
341
342#ifdef CONFIG_ETRAX_NANDBOOT
343 {
344 struct mtd_info *tmp_mtd;
345
346 printk(KERN_INFO "axisflashmap: Set to boot from NAND flash, "
347 "making NAND flash primary device.\n");
348 tmp_mtd = main_mtd;
349 main_mtd = aux_mtd;
350 aux_mtd = tmp_mtd;
351 }
352#endif
353#endif
354
355 if (!main_mtd && !aux_mtd) {
356
357
358
359 printk(KERN_INFO "axisflashmap: Found no flash chip.\n");
360 }
361
362#if 0
363 if (main_mtd) {
364 int sectoraddr;
365 for (sectoraddr = 0; sectoraddr < 2*65536+4096;
366 sectoraddr += PAGESIZE) {
367 main_mtd->read(main_mtd, sectoraddr, PAGESIZE, &len,
368 page);
369 printk(KERN_INFO
370 "Sector at %d (length %d):\n",
371 sectoraddr, len);
372 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1, page, PAGESIZE, false);
373 }
374 }
375#endif
376
377 if (main_mtd) {
378 loff_t ptable_sector = CONFIG_ETRAX_PTABLE_SECTOR;
379 main_mtd->owner = THIS_MODULE;
380 axisflash_mtd = main_mtd;
381
382
383
384 pidx++;
385#ifdef CONFIG_ETRAX_NANDBOOT
386
387
388
389 int blockstat;
390 do {
391 blockstat = mtd_block_isbad(main_mtd, ptable_sector);
392 if (blockstat < 0)
393 ptable_sector = 0;
394 else if (blockstat)
395 ptable_sector += main_mtd->erasesize;
396 } while (blockstat && ptable_sector);
397#endif
398 if (ptable_sector) {
399 mtd_read(main_mtd, ptable_sector, PAGESIZE, &len,
400 page);
401 ptable_head = &((struct partitiontable *) page)->head;
402 }
403
404#if 0
405 printk(KERN_INFO
406 "axisflashmap: flash read %d bytes at 0x%08x, data: %8ph\n",
407 len, CONFIG_ETRAX_PTABLE_SECTOR, page);
408 printk(KERN_INFO
409 "axisflashmap: partition table offset %d, data: %8ph\n",
410 PARTITION_TABLE_OFFSET, page + PARTITION_TABLE_OFFSET);
411#endif
412 }
413
414 if (ptable_head && (ptable_head->magic == PARTITION_TABLE_MAGIC)
415 && (ptable_head->size <
416 (MAX_PARTITIONS * sizeof(struct partitiontable_entry) +
417 PARTITIONTABLE_END_MARKER_SIZE))
418 && (*(unsigned long*)((void*)ptable_head + sizeof(*ptable_head) +
419 ptable_head->size -
420 PARTITIONTABLE_END_MARKER_SIZE)
421 == PARTITIONTABLE_END_MARKER)) {
422
423
424
425 struct partitiontable_entry *max_addr =
426 (struct partitiontable_entry *)
427 ((unsigned long)ptable_head + sizeof(*ptable_head) +
428 ptable_head->size);
429 unsigned long offset = CONFIG_ETRAX_PTABLE_SECTOR;
430 unsigned char *p;
431 unsigned long csum = 0;
432
433 ptable = (struct partitiontable_entry *)
434 ((unsigned long)ptable_head + sizeof(*ptable_head));
435
436
437 p = (unsigned char*) ptable;
438
439 while (p <= (unsigned char*)max_addr) {
440 csum += *p++;
441 csum += *p++;
442 csum += *p++;
443 csum += *p++;
444 }
445 ptable_ok = (csum == ptable_head->checksum);
446
447
448 printk(KERN_INFO "axisflashmap: "
449 "Found a%s partition table at 0x%p-0x%p.\n",
450 (ptable_ok ? " valid" : "n invalid"), ptable_head,
451 max_addr);
452
453
454
455
456 while (ptable_ok
457 && ptable->offset != PARTITIONTABLE_END_MARKER
458 && ptable < max_addr
459 && pidx < MAX_PARTITIONS - 1) {
460
461 axis_partitions[pidx].offset = offset + ptable->offset;
462#ifdef CONFIG_ETRAX_NANDFLASH
463 if (main_mtd->type == MTD_NANDFLASH) {
464 axis_partitions[pidx].size =
465 (((ptable+1)->offset ==
466 PARTITIONTABLE_END_MARKER) ?
467 main_mtd->size :
468 ((ptable+1)->offset + offset)) -
469 (ptable->offset + offset);
470
471 } else
472#endif
473 axis_partitions[pidx].size = ptable->size;
474#ifdef CONFIG_ETRAX_NANDBOOT
475
476
477
478 if (!nand_boot &&
479 ram_rootfs_partition < 0 &&
480 ptable->type == PARTITION_TYPE_JFFS2 &&
481 (ptable->flags & PARTITION_FLAGS_READONLY_MASK) ==
482 PARTITION_FLAGS_READONLY)
483 ram_rootfs_partition = pidx;
484#endif
485 pidx++;
486 ptable++;
487 }
488 }
489
490
491
492
493 partition = &axis_partitions[0];
494 if (main_mtd && !ptable_ok) {
495 memcpy(axis_partitions, axis_default_partitions,
496 sizeof(axis_default_partitions));
497 pidx = NUM_DEFAULT_PARTITIONS;
498 ram_rootfs_partition = DEFAULT_ROOTFS_PARTITION_NO;
499 }
500
501
502 if (romfs_in_flash) {
503
504
505 printk(KERN_INFO "axisflashmap: Adding partition for "
506 "overlapping root file system image\n");
507 axis_partitions[pidx].size = romfs_length;
508 axis_partitions[pidx].offset = romfs_start - FLASH_CACHED_ADDR;
509 axis_partitions[pidx].name = "romfs";
510 axis_partitions[pidx].mask_flags |= MTD_WRITEABLE;
511 ram_rootfs_partition = -1;
512 pidx++;
513 } else if (romfs_length && !nand_boot) {
514
515
516 if (ram_rootfs_partition < 0) {
517
518 ram_rootfs_partition = pidx;
519 pidx++;
520 }
521 printk(KERN_INFO "axisflashmap: Adding partition for "
522 "root file system image in RAM\n");
523 axis_partitions[ram_rootfs_partition].size = romfs_length;
524 axis_partitions[ram_rootfs_partition].offset = romfs_start;
525 axis_partitions[ram_rootfs_partition].name = "romfs";
526 axis_partitions[ram_rootfs_partition].mask_flags |=
527 MTD_WRITEABLE;
528 }
529
530#ifdef CONFIG_ETRAX_AXISFLASHMAP_MTD0WHOLE
531 if (main_mtd) {
532 main_partition.size = main_mtd->size;
533 err = mtd_device_register(main_mtd, &main_partition, 1);
534 if (err)
535 panic("axisflashmap: Could not initialize "
536 "partition for whole main mtd device!\n");
537 }
538#endif
539
540
541
542
543
544 for (part = 0; part < pidx; part++) {
545 if (part == ram_rootfs_partition) {
546
547 struct mtd_info *mtd_ram;
548
549 mtd_ram = kmalloc(sizeof(struct mtd_info), GFP_KERNEL);
550 if (!mtd_ram)
551 panic("axisflashmap: Couldn't allocate memory "
552 "for mtd_info!\n");
553 printk(KERN_INFO "axisflashmap: Adding RAM partition "
554 "for rootfs image.\n");
555 err = mtdram_init_device(mtd_ram,
556 (void *)(u_int32_t)partition[part].offset,
557 partition[part].size,
558 partition[part].name);
559 if (err)
560 panic("axisflashmap: Could not initialize "
561 "MTD RAM device!\n");
562
563
564
565
566 mtd_ram->erasesize = (main_mtd ? main_mtd->erasesize :
567 CONFIG_ETRAX_PTABLE_SECTOR);
568 } else {
569 err = mtd_device_register(main_mtd, &partition[part],
570 1);
571 if (err)
572 panic("axisflashmap: Could not add mtd "
573 "partition %d\n", part);
574 }
575 }
576
577 if (aux_mtd) {
578 aux_partition.size = aux_mtd->size;
579 err = mtd_device_register(aux_mtd, &aux_partition, 1);
580 if (err)
581 panic("axisflashmap: Could not initialize "
582 "aux mtd device!\n");
583
584 }
585
586 return err;
587}
588
589
590module_init(init_axis_flash);
591
592EXPORT_SYMBOL(axisflash_mtd);
593