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1da177e4 LT |
1 | /* |
2 | * Physical mapping layer for MTD using the Axis partitiontable format | |
3 | * | |
4 | * Copyright (c) 2001, 2002 Axis Communications AB | |
5 | * | |
6 | * This file is under the GPL. | |
7 | * | |
8 | * First partition is always sector 0 regardless of if we find a partitiontable | |
9 | * or not. In the start of the next sector, there can be a partitiontable that | |
10 | * tells us what other partitions to define. If there isn't, we use a default | |
11 | * partition split defined below. | |
12 | * | |
1da177e4 LT |
13 | */ |
14 | ||
15 | #include <linux/module.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/kernel.h> | |
1da177e4 | 18 | #include <linux/init.h> |
4e57b681 | 19 | #include <linux/slab.h> |
1da177e4 LT |
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> | |
556dcee7 | 29 | #include <arch/sv_addr_ag.h> |
1da177e4 LT |
30 | |
31 | #ifdef CONFIG_CRIS_LOW_MAP | |
32 | #define FLASH_UNCACHED_ADDR KSEG_8 | |
33 | #define FLASH_CACHED_ADDR KSEG_5 | |
34 | #else | |
35 | #define FLASH_UNCACHED_ADDR KSEG_E | |
36 | #define FLASH_CACHED_ADDR KSEG_F | |
37 | #endif | |
38 | ||
39 | #if CONFIG_ETRAX_FLASH_BUSWIDTH==1 | |
40 | #define flash_data __u8 | |
41 | #elif CONFIG_ETRAX_FLASH_BUSWIDTH==2 | |
42 | #define flash_data __u16 | |
43 | #elif CONFIG_ETRAX_FLASH_BUSWIDTH==4 | |
7e920426 | 44 | #define flash_data __u32 |
1da177e4 LT |
45 | #endif |
46 | ||
47 | /* From head.S */ | |
48 | extern unsigned long romfs_start, romfs_length, romfs_in_flash; | |
49 | ||
50 | /* The master mtd for the entire flash. */ | |
51 | struct mtd_info* axisflash_mtd = NULL; | |
52 | ||
53 | /* Map driver functions. */ | |
54 | ||
55 | static map_word flash_read(struct map_info *map, unsigned long ofs) | |
56 | { | |
57 | map_word tmp; | |
58 | tmp.x[0] = *(flash_data *)(map->map_priv_1 + ofs); | |
59 | return tmp; | |
60 | } | |
61 | ||
62 | static void flash_copy_from(struct map_info *map, void *to, | |
63 | unsigned long from, ssize_t len) | |
64 | { | |
65 | memcpy(to, (void *)(map->map_priv_1 + from), len); | |
66 | } | |
67 | ||
68 | static void flash_write(struct map_info *map, map_word d, unsigned long adr) | |
69 | { | |
70 | *(flash_data *)(map->map_priv_1 + adr) = (flash_data)d.x[0]; | |
71 | } | |
72 | ||
73 | /* | |
74 | * The map for chip select e0. | |
75 | * | |
76 | * We run into tricky coherence situations if we mix cached with uncached | |
77 | * accesses to we only use the uncached version here. | |
78 | * | |
79 | * The size field is the total size where the flash chips may be mapped on the | |
80 | * chip select. MTD probes should find all devices there and it does not matter | |
81 | * if there are unmapped gaps or aliases (mirrors of flash devices). The MTD | |
82 | * probes will ignore them. | |
83 | * | |
84 | * The start address in map_priv_1 is in virtual memory so we cannot use | |
85 | * MEM_CSE0_START but must rely on that FLASH_UNCACHED_ADDR is the start | |
86 | * address of cse0. | |
87 | */ | |
88 | static struct map_info map_cse0 = { | |
89 | .name = "cse0", | |
90 | .size = MEM_CSE0_SIZE, | |
91 | .bankwidth = CONFIG_ETRAX_FLASH_BUSWIDTH, | |
92 | .read = flash_read, | |
93 | .copy_from = flash_copy_from, | |
94 | .write = flash_write, | |
95 | .map_priv_1 = FLASH_UNCACHED_ADDR | |
96 | }; | |
97 | ||
98 | /* | |
99 | * The map for chip select e1. | |
100 | * | |
101 | * If there was a gap between cse0 and cse1, map_priv_1 would get the wrong | |
102 | * address, but there isn't. | |
103 | */ | |
104 | static struct map_info map_cse1 = { | |
105 | .name = "cse1", | |
106 | .size = MEM_CSE1_SIZE, | |
107 | .bankwidth = CONFIG_ETRAX_FLASH_BUSWIDTH, | |
108 | .read = flash_read, | |
109 | .copy_from = flash_copy_from, | |
110 | .write = flash_write, | |
111 | .map_priv_1 = FLASH_UNCACHED_ADDR + MEM_CSE0_SIZE | |
112 | }; | |
113 | ||
114 | /* If no partition-table was found, we use this default-set. */ | |
32872b20 | 115 | #define MAX_PARTITIONS 7 |
1da177e4 LT |
116 | #define NUM_DEFAULT_PARTITIONS 3 |
117 | ||
118 | /* | |
119 | * Default flash size is 2MB. CONFIG_ETRAX_PTABLE_SECTOR is most likely the | |
120 | * size of one flash block and "filesystem"-partition needs 5 blocks to be able | |
121 | * to use JFFS. | |
122 | */ | |
123 | static struct mtd_partition axis_default_partitions[NUM_DEFAULT_PARTITIONS] = { | |
124 | { | |
125 | .name = "boot firmware", | |
126 | .size = CONFIG_ETRAX_PTABLE_SECTOR, | |
127 | .offset = 0 | |
128 | }, | |
129 | { | |
130 | .name = "kernel", | |
131 | .size = 0x200000 - (6 * CONFIG_ETRAX_PTABLE_SECTOR), | |
132 | .offset = CONFIG_ETRAX_PTABLE_SECTOR | |
133 | }, | |
134 | { | |
135 | .name = "filesystem", | |
136 | .size = 5 * CONFIG_ETRAX_PTABLE_SECTOR, | |
137 | .offset = 0x200000 - (5 * CONFIG_ETRAX_PTABLE_SECTOR) | |
138 | } | |
139 | }; | |
140 | ||
141 | /* Initialize the ones normally used. */ | |
142 | static struct mtd_partition axis_partitions[MAX_PARTITIONS] = { | |
143 | { | |
144 | .name = "part0", | |
145 | .size = CONFIG_ETRAX_PTABLE_SECTOR, | |
146 | .offset = 0 | |
147 | }, | |
148 | { | |
149 | .name = "part1", | |
150 | .size = 0, | |
151 | .offset = 0 | |
152 | }, | |
153 | { | |
154 | .name = "part2", | |
155 | .size = 0, | |
156 | .offset = 0 | |
157 | }, | |
158 | { | |
159 | .name = "part3", | |
160 | .size = 0, | |
161 | .offset = 0 | |
162 | }, | |
163 | { | |
164 | .name = "part4", | |
165 | .size = 0, | |
166 | .offset = 0 | |
167 | }, | |
168 | { | |
169 | .name = "part5", | |
170 | .size = 0, | |
171 | .offset = 0 | |
172 | }, | |
173 | { | |
174 | .name = "part6", | |
175 | .size = 0, | |
176 | .offset = 0 | |
177 | }, | |
178 | }; | |
179 | ||
32872b20 JN |
180 | #ifdef CONFIG_ETRAX_AXISFLASHMAP_MTD0WHOLE |
181 | /* Main flash device */ | |
182 | static struct mtd_partition main_partition = { | |
183 | .name = "main", | |
184 | .size = 0, | |
185 | .offset = 0 | |
186 | }; | |
187 | #endif | |
188 | ||
1da177e4 LT |
189 | /* |
190 | * Probe a chip select for AMD-compatible (JEDEC) or CFI-compatible flash | |
191 | * chips in that order (because the amd_flash-driver is faster). | |
192 | */ | |
193 | static struct mtd_info *probe_cs(struct map_info *map_cs) | |
194 | { | |
195 | struct mtd_info *mtd_cs = NULL; | |
196 | ||
197 | printk(KERN_INFO | |
198 | "%s: Probing a 0x%08lx bytes large window at 0x%08lx.\n", | |
199 | map_cs->name, map_cs->size, map_cs->map_priv_1); | |
200 | ||
1da177e4 | 201 | #ifdef CONFIG_MTD_CFI |
1b8be1d8 JN |
202 | mtd_cs = do_map_probe("cfi_probe", map_cs); |
203 | #endif | |
204 | #ifdef CONFIG_MTD_JEDECPROBE | |
32872b20 | 205 | if (!mtd_cs) |
1b8be1d8 | 206 | mtd_cs = do_map_probe("jedec_probe", map_cs); |
1da177e4 LT |
207 | #endif |
208 | ||
209 | return mtd_cs; | |
210 | } | |
211 | ||
32872b20 | 212 | /* |
1da177e4 LT |
213 | * Probe each chip select individually for flash chips. If there are chips on |
214 | * both cse0 and cse1, the mtd_info structs will be concatenated to one struct | |
014b38ec | 215 | * so that MTD partitions can cross chip boundaries. |
1da177e4 LT |
216 | * |
217 | * The only known restriction to how you can mount your chips is that each | |
218 | * chip select must hold similar flash chips. But you need external hardware | |
219 | * to do that anyway and you can put totally different chips on cse0 and cse1 | |
220 | * so it isn't really much of a restriction. | |
221 | */ | |
222 | static struct mtd_info *flash_probe(void) | |
223 | { | |
224 | struct mtd_info *mtd_cse0; | |
225 | struct mtd_info *mtd_cse1; | |
226 | struct mtd_info *mtd_cse; | |
227 | ||
228 | mtd_cse0 = probe_cs(&map_cse0); | |
229 | mtd_cse1 = probe_cs(&map_cse1); | |
230 | ||
231 | if (!mtd_cse0 && !mtd_cse1) { | |
232 | /* No chip found. */ | |
233 | return NULL; | |
234 | } | |
235 | ||
236 | if (mtd_cse0 && mtd_cse1) { | |
1da177e4 | 237 | struct mtd_info *mtds[] = { mtd_cse0, mtd_cse1 }; |
32872b20 | 238 | |
1da177e4 LT |
239 | /* Since the concatenation layer adds a small overhead we |
240 | * could try to figure out if the chips in cse0 and cse1 are | |
241 | * identical and reprobe the whole cse0+cse1 window. But since | |
242 | * flash chips are slow, the overhead is relatively small. | |
243 | * So we use the MTD concatenation layer instead of further | |
244 | * complicating the probing procedure. | |
245 | */ | |
8447157a | 246 | mtd_cse = mtd_concat_create(mtds, ARRAY_SIZE(mtds), |
1da177e4 | 247 | "cse0+cse1"); |
1da177e4 LT |
248 | if (!mtd_cse) { |
249 | printk(KERN_ERR "%s and %s: Concatenation failed!\n", | |
250 | map_cse0.name, map_cse1.name); | |
251 | ||
252 | /* The best we can do now is to only use what we found | |
253 | * at cse0. | |
32872b20 | 254 | */ |
1da177e4 LT |
255 | mtd_cse = mtd_cse0; |
256 | map_destroy(mtd_cse1); | |
257 | } | |
258 | } else { | |
259 | mtd_cse = mtd_cse0? mtd_cse0 : mtd_cse1; | |
260 | } | |
261 | ||
262 | return mtd_cse; | |
263 | } | |
264 | ||
265 | /* | |
266 | * Probe the flash chip(s) and, if it succeeds, read the partition-table | |
267 | * and register the partitions with MTD. | |
268 | */ | |
269 | static int __init init_axis_flash(void) | |
270 | { | |
271 | struct mtd_info *mymtd; | |
272 | int err = 0; | |
273 | int pidx = 0; | |
274 | struct partitiontable_head *ptable_head = NULL; | |
275 | struct partitiontable_entry *ptable; | |
276 | int use_default_ptable = 1; /* Until proven otherwise. */ | |
32872b20 | 277 | const char pmsg[] = " /dev/flash%d at 0x%08x, size 0x%08x\n"; |
1da177e4 LT |
278 | |
279 | if (!(mymtd = flash_probe())) { | |
280 | /* There's no reason to use this module if no flash chip can | |
281 | * be identified. Make sure that's understood. | |
282 | */ | |
283 | printk(KERN_INFO "axisflashmap: Found no flash chip.\n"); | |
284 | } else { | |
285 | printk(KERN_INFO "%s: 0x%08x bytes of flash memory.\n", | |
286 | mymtd->name, mymtd->size); | |
287 | axisflash_mtd = mymtd; | |
288 | } | |
289 | ||
290 | if (mymtd) { | |
291 | mymtd->owner = THIS_MODULE; | |
292 | ptable_head = (struct partitiontable_head *)(FLASH_CACHED_ADDR + | |
293 | CONFIG_ETRAX_PTABLE_SECTOR + | |
294 | PARTITION_TABLE_OFFSET); | |
295 | } | |
296 | pidx++; /* First partition is always set to the default. */ | |
297 | ||
298 | if (ptable_head && (ptable_head->magic == PARTITION_TABLE_MAGIC) | |
299 | && (ptable_head->size < | |
300 | (MAX_PARTITIONS * sizeof(struct partitiontable_entry) + | |
301 | PARTITIONTABLE_END_MARKER_SIZE)) | |
302 | && (*(unsigned long*)((void*)ptable_head + sizeof(*ptable_head) + | |
303 | ptable_head->size - | |
304 | PARTITIONTABLE_END_MARKER_SIZE) | |
305 | == PARTITIONTABLE_END_MARKER)) { | |
306 | /* Looks like a start, sane length and end of a | |
307 | * partition table, lets check csum etc. | |
308 | */ | |
309 | int ptable_ok = 0; | |
310 | struct partitiontable_entry *max_addr = | |
311 | (struct partitiontable_entry *) | |
312 | ((unsigned long)ptable_head + sizeof(*ptable_head) + | |
313 | ptable_head->size); | |
314 | unsigned long offset = CONFIG_ETRAX_PTABLE_SECTOR; | |
315 | unsigned char *p; | |
316 | unsigned long csum = 0; | |
32872b20 | 317 | |
1da177e4 LT |
318 | ptable = (struct partitiontable_entry *) |
319 | ((unsigned long)ptable_head + sizeof(*ptable_head)); | |
320 | ||
321 | /* Lets be PARANOID, and check the checksum. */ | |
322 | p = (unsigned char*) ptable; | |
323 | ||
324 | while (p <= (unsigned char*)max_addr) { | |
325 | csum += *p++; | |
326 | csum += *p++; | |
327 | csum += *p++; | |
328 | csum += *p++; | |
329 | } | |
330 | ptable_ok = (csum == ptable_head->checksum); | |
331 | ||
332 | /* Read the entries and use/show the info. */ | |
333 | printk(KERN_INFO " Found a%s partition table at 0x%p-0x%p.\n", | |
334 | (ptable_ok ? " valid" : "n invalid"), ptable_head, | |
335 | max_addr); | |
336 | ||
337 | /* We have found a working bootblock. Now read the | |
338 | * partition table. Scan the table. It ends when | |
339 | * there is 0xffffffff, that is, empty flash. | |
340 | */ | |
341 | while (ptable_ok | |
342 | && ptable->offset != 0xffffffff | |
343 | && ptable < max_addr | |
344 | && pidx < MAX_PARTITIONS) { | |
345 | ||
346 | axis_partitions[pidx].offset = offset + ptable->offset; | |
347 | axis_partitions[pidx].size = ptable->size; | |
348 | ||
349 | printk(pmsg, pidx, axis_partitions[pidx].offset, | |
350 | axis_partitions[pidx].size); | |
351 | pidx++; | |
352 | ptable++; | |
353 | } | |
354 | use_default_ptable = !ptable_ok; | |
355 | } | |
356 | ||
357 | if (romfs_in_flash) { | |
358 | /* Add an overlapping device for the root partition (romfs). */ | |
359 | ||
360 | axis_partitions[pidx].name = "romfs"; | |
361 | axis_partitions[pidx].size = romfs_length; | |
362 | axis_partitions[pidx].offset = romfs_start - FLASH_CACHED_ADDR; | |
363 | axis_partitions[pidx].mask_flags |= MTD_WRITEABLE; | |
364 | ||
365 | printk(KERN_INFO | |
366 | " Adding readonly flash partition for romfs image:\n"); | |
367 | printk(pmsg, pidx, axis_partitions[pidx].offset, | |
368 | axis_partitions[pidx].size); | |
369 | pidx++; | |
370 | } | |
371 | ||
32872b20 JN |
372 | #ifdef CONFIG_ETRAX_AXISFLASHMAP_MTD0WHOLE |
373 | if (mymtd) { | |
374 | main_partition.size = mymtd->size; | |
36cda05b | 375 | err = mtd_device_register(mymtd, &main_partition, 1); |
32872b20 JN |
376 | if (err) |
377 | panic("axisflashmap: Could not initialize " | |
378 | "partition for whole main mtd device!\n"); | |
379 | } | |
380 | #endif | |
381 | ||
1da177e4 LT |
382 | if (mymtd) { |
383 | if (use_default_ptable) { | |
384 | printk(KERN_INFO " Using default partition table.\n"); | |
36cda05b JI |
385 | err = mtd_device_register(mymtd, |
386 | axis_default_partitions, | |
387 | NUM_DEFAULT_PARTITIONS); | |
1da177e4 | 388 | } else { |
36cda05b JI |
389 | err = mtd_device_register(mymtd, axis_partitions, |
390 | pidx); | |
1da177e4 LT |
391 | } |
392 | ||
32872b20 | 393 | if (err) |
1da177e4 | 394 | panic("axisflashmap could not add MTD partitions!\n"); |
1da177e4 LT |
395 | } |
396 | ||
397 | if (!romfs_in_flash) { | |
398 | /* Create an RAM device for the root partition (romfs). */ | |
399 | ||
ef158bdf | 400 | #if !defined(CONFIG_MTD_MTDRAM) || (CONFIG_MTDRAM_TOTAL_SIZE != 0) |
1da177e4 LT |
401 | /* No use trying to boot this kernel from RAM. Panic! */ |
402 | printk(KERN_EMERG "axisflashmap: Cannot create an MTD RAM " | |
403 | "device due to kernel (mis)configuration!\n"); | |
404 | panic("This kernel cannot boot from RAM!\n"); | |
405 | #else | |
406 | struct mtd_info *mtd_ram; | |
407 | ||
32872b20 JN |
408 | mtd_ram = kmalloc(sizeof(struct mtd_info), GFP_KERNEL); |
409 | if (!mtd_ram) | |
1da177e4 LT |
410 | panic("axisflashmap couldn't allocate memory for " |
411 | "mtd_info!\n"); | |
1da177e4 LT |
412 | |
413 | printk(KERN_INFO " Adding RAM partition for romfs image:\n"); | |
32872b20 JN |
414 | printk(pmsg, pidx, (unsigned)romfs_start, |
415 | (unsigned)romfs_length); | |
416 | ||
417 | err = mtdram_init_device(mtd_ram, | |
418 | (void *)romfs_start, | |
419 | romfs_length, | |
420 | "romfs"); | |
421 | if (err) | |
1da177e4 LT |
422 | panic("axisflashmap could not initialize MTD RAM " |
423 | "device!\n"); | |
1da177e4 LT |
424 | #endif |
425 | } | |
1da177e4 LT |
426 | return err; |
427 | } | |
428 | ||
429 | /* This adds the above to the kernels init-call chain. */ | |
430 | module_init(init_axis_flash); | |
431 | ||
432 | EXPORT_SYMBOL(axisflash_mtd); |