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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * c 2001 PPC 64 Team, IBM Corp | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * /dev/nvram driver for PPC64 | |
10 | * | |
11 | * This perhaps should live in drivers/char | |
12 | * | |
13 | * TODO: Split the /dev/nvram part (that one can use | |
14 | * drivers/char/generic_nvram.c) from the arch & partition | |
15 | * parsing code. | |
16 | */ | |
17 | ||
18 | #include <linux/module.h> | |
19 | ||
20 | #include <linux/types.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/fs.h> | |
23 | #include <linux/miscdevice.h> | |
24 | #include <linux/fcntl.h> | |
25 | #include <linux/nvram.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/spinlock.h> | |
29 | #include <asm/uaccess.h> | |
30 | #include <asm/nvram.h> | |
31 | #include <asm/rtas.h> | |
32 | #include <asm/prom.h> | |
33 | #include <asm/machdep.h> | |
1da177e4 LT |
34 | |
35 | #undef DEBUG_NVRAM | |
36 | ||
36673307 BH |
37 | #define NVRAM_HEADER_LEN sizeof(struct nvram_header) |
38 | #define NVRAM_BLOCK_LEN NVRAM_HEADER_LEN | |
74d51d02 BH |
39 | |
40 | /* If change this size, then change the size of NVNAME_LEN */ | |
41 | struct nvram_header { | |
42 | unsigned char signature; | |
43 | unsigned char checksum; | |
44 | unsigned short length; | |
6024ede9 | 45 | /* Terminating null required only for names < 12 chars. */ |
74d51d02 BH |
46 | char name[12]; |
47 | }; | |
48 | ||
49 | struct nvram_partition { | |
50 | struct list_head partition; | |
51 | struct nvram_header header; | |
52 | unsigned int index; | |
53 | }; | |
54 | ||
690d1a9b | 55 | static LIST_HEAD(nvram_partitions); |
1da177e4 LT |
56 | |
57 | static loff_t dev_nvram_llseek(struct file *file, loff_t offset, int origin) | |
58 | { | |
59 | int size; | |
60 | ||
61 | if (ppc_md.nvram_size == NULL) | |
62 | return -ENODEV; | |
63 | size = ppc_md.nvram_size(); | |
64 | ||
65 | switch (origin) { | |
66 | case 1: | |
67 | offset += file->f_pos; | |
68 | break; | |
69 | case 2: | |
70 | offset += size; | |
71 | break; | |
72 | } | |
73 | if (offset < 0) | |
74 | return -EINVAL; | |
75 | file->f_pos = offset; | |
76 | return file->f_pos; | |
77 | } | |
78 | ||
79 | ||
80 | static ssize_t dev_nvram_read(struct file *file, char __user *buf, | |
81 | size_t count, loff_t *ppos) | |
82 | { | |
f9ce299f AB |
83 | ssize_t ret; |
84 | char *tmp = NULL; | |
85 | ssize_t size; | |
1da177e4 | 86 | |
7029705a CG |
87 | if (!ppc_md.nvram_size) { |
88 | ret = -ENODEV; | |
f9ce299f | 89 | goto out; |
7029705a | 90 | } |
f9ce299f | 91 | |
1da177e4 | 92 | size = ppc_md.nvram_size(); |
7029705a CG |
93 | if (size < 0) { |
94 | ret = size; | |
f9ce299f | 95 | goto out; |
7029705a CG |
96 | } |
97 | ||
98 | if (*ppos >= size) { | |
99 | ret = 0; | |
100 | goto out; | |
101 | } | |
1da177e4 | 102 | |
f9ce299f AB |
103 | count = min_t(size_t, count, size - *ppos); |
104 | count = min(count, PAGE_SIZE); | |
1da177e4 | 105 | |
f9ce299f | 106 | tmp = kmalloc(count, GFP_KERNEL); |
7029705a CG |
107 | if (!tmp) { |
108 | ret = -ENOMEM; | |
f9ce299f | 109 | goto out; |
7029705a | 110 | } |
1da177e4 | 111 | |
f9ce299f AB |
112 | ret = ppc_md.nvram_read(tmp, count, ppos); |
113 | if (ret <= 0) | |
114 | goto out; | |
115 | ||
116 | if (copy_to_user(buf, tmp, ret)) | |
117 | ret = -EFAULT; | |
1da177e4 | 118 | |
f9ce299f AB |
119 | out: |
120 | kfree(tmp); | |
121 | return ret; | |
1da177e4 LT |
122 | |
123 | } | |
124 | ||
125 | static ssize_t dev_nvram_write(struct file *file, const char __user *buf, | |
f9ce299f | 126 | size_t count, loff_t *ppos) |
1da177e4 | 127 | { |
f9ce299f AB |
128 | ssize_t ret; |
129 | char *tmp = NULL; | |
130 | ssize_t size; | |
1da177e4 | 131 | |
f9ce299f AB |
132 | ret = -ENODEV; |
133 | if (!ppc_md.nvram_size) | |
134 | goto out; | |
135 | ||
136 | ret = 0; | |
1da177e4 | 137 | size = ppc_md.nvram_size(); |
f9ce299f AB |
138 | if (*ppos >= size || size < 0) |
139 | goto out; | |
1da177e4 | 140 | |
f9ce299f AB |
141 | count = min_t(size_t, count, size - *ppos); |
142 | count = min(count, PAGE_SIZE); | |
1da177e4 | 143 | |
f9ce299f AB |
144 | ret = -ENOMEM; |
145 | tmp = kmalloc(count, GFP_KERNEL); | |
146 | if (!tmp) | |
147 | goto out; | |
148 | ||
149 | ret = -EFAULT; | |
150 | if (copy_from_user(tmp, buf, count)) | |
151 | goto out; | |
152 | ||
153 | ret = ppc_md.nvram_write(tmp, count, ppos); | |
154 | ||
155 | out: | |
156 | kfree(tmp); | |
157 | return ret; | |
1da177e4 | 158 | |
1da177e4 LT |
159 | } |
160 | ||
3b03fecd TG |
161 | static long dev_nvram_ioctl(struct file *file, unsigned int cmd, |
162 | unsigned long arg) | |
1da177e4 LT |
163 | { |
164 | switch(cmd) { | |
165 | #ifdef CONFIG_PPC_PMAC | |
166 | case OBSOLETE_PMAC_NVRAM_GET_OFFSET: | |
167 | printk(KERN_WARNING "nvram: Using obsolete PMAC_NVRAM_GET_OFFSET ioctl\n"); | |
168 | case IOC_NVRAM_GET_OFFSET: { | |
169 | int part, offset; | |
170 | ||
e8222502 | 171 | if (!machine_is(powermac)) |
1da177e4 LT |
172 | return -EINVAL; |
173 | if (copy_from_user(&part, (void __user*)arg, sizeof(part)) != 0) | |
174 | return -EFAULT; | |
175 | if (part < pmac_nvram_OF || part > pmac_nvram_NR) | |
176 | return -EINVAL; | |
177 | offset = pmac_get_partition(part); | |
178 | if (offset < 0) | |
179 | return offset; | |
180 | if (copy_to_user((void __user*)arg, &offset, sizeof(offset)) != 0) | |
181 | return -EFAULT; | |
182 | return 0; | |
183 | } | |
184 | #endif /* CONFIG_PPC_PMAC */ | |
af308377 SR |
185 | default: |
186 | return -EINVAL; | |
1da177e4 | 187 | } |
1da177e4 LT |
188 | } |
189 | ||
5dfe4c96 | 190 | const struct file_operations nvram_fops = { |
3b03fecd TG |
191 | .owner = THIS_MODULE, |
192 | .llseek = dev_nvram_llseek, | |
193 | .read = dev_nvram_read, | |
194 | .write = dev_nvram_write, | |
195 | .unlocked_ioctl = dev_nvram_ioctl, | |
1da177e4 LT |
196 | }; |
197 | ||
198 | static struct miscdevice nvram_dev = { | |
199 | NVRAM_MINOR, | |
200 | "nvram", | |
201 | &nvram_fops | |
202 | }; | |
203 | ||
204 | ||
205 | #ifdef DEBUG_NVRAM | |
32c105c3 | 206 | static void __init nvram_print_partitions(char * label) |
1da177e4 | 207 | { |
1da177e4 LT |
208 | struct nvram_partition * tmp_part; |
209 | ||
210 | printk(KERN_WARNING "--------%s---------\n", label); | |
211 | printk(KERN_WARNING "indx\t\tsig\tchks\tlen\tname\n"); | |
690d1a9b | 212 | list_for_each_entry(tmp_part, &nvram_partitions, partition) { |
6024ede9 | 213 | printk(KERN_WARNING "%4d \t%02x\t%02x\t%d\t%12s\n", |
1da177e4 LT |
214 | tmp_part->index, tmp_part->header.signature, |
215 | tmp_part->header.checksum, tmp_part->header.length, | |
216 | tmp_part->header.name); | |
217 | } | |
218 | } | |
219 | #endif | |
220 | ||
221 | ||
32c105c3 | 222 | static int __init nvram_write_header(struct nvram_partition * part) |
1da177e4 LT |
223 | { |
224 | loff_t tmp_index; | |
225 | int rc; | |
226 | ||
227 | tmp_index = part->index; | |
228 | rc = ppc_md.nvram_write((char *)&part->header, NVRAM_HEADER_LEN, &tmp_index); | |
229 | ||
230 | return rc; | |
231 | } | |
232 | ||
233 | ||
32c105c3 | 234 | static unsigned char __init nvram_checksum(struct nvram_header *p) |
1da177e4 LT |
235 | { |
236 | unsigned int c_sum, c_sum2; | |
237 | unsigned short *sp = (unsigned short *)p->name; /* assume 6 shorts */ | |
238 | c_sum = p->signature + p->length + sp[0] + sp[1] + sp[2] + sp[3] + sp[4] + sp[5]; | |
239 | ||
240 | /* The sum may have spilled into the 3rd byte. Fold it back. */ | |
241 | c_sum = ((c_sum & 0xffff) + (c_sum >> 16)) & 0xffff; | |
242 | /* The sum cannot exceed 2 bytes. Fold it into a checksum */ | |
243 | c_sum2 = (c_sum >> 8) + (c_sum << 8); | |
244 | c_sum = ((c_sum + c_sum2) >> 8) & 0xff; | |
245 | return c_sum; | |
246 | } | |
247 | ||
0f4ac132 JK |
248 | /* |
249 | * Per the criteria passed via nvram_remove_partition(), should this | |
250 | * partition be removed? 1=remove, 0=keep | |
251 | */ | |
252 | static int nvram_can_remove_partition(struct nvram_partition *part, | |
253 | const char *name, int sig, const char *exceptions[]) | |
254 | { | |
255 | if (part->header.signature != sig) | |
256 | return 0; | |
257 | if (name) { | |
258 | if (strncmp(name, part->header.name, 12)) | |
259 | return 0; | |
260 | } else if (exceptions) { | |
261 | const char **except; | |
262 | for (except = exceptions; *except; except++) { | |
263 | if (!strncmp(*except, part->header.name, 12)) | |
264 | return 0; | |
265 | } | |
266 | } | |
267 | return 1; | |
268 | } | |
269 | ||
fa2b4e54 BH |
270 | /** |
271 | * nvram_remove_partition - Remove one or more partitions in nvram | |
272 | * @name: name of the partition to remove, or NULL for a | |
273 | * signature only match | |
274 | * @sig: signature of the partition(s) to remove | |
0f4ac132 JK |
275 | * @exceptions: When removing all partitions with a matching signature, |
276 | * leave these alone. | |
fa2b4e54 BH |
277 | */ |
278 | ||
0f4ac132 JK |
279 | int __init nvram_remove_partition(const char *name, int sig, |
280 | const char *exceptions[]) | |
1da177e4 | 281 | { |
fa2b4e54 | 282 | struct nvram_partition *part, *prev, *tmp; |
1da177e4 LT |
283 | int rc; |
284 | ||
690d1a9b | 285 | list_for_each_entry(part, &nvram_partitions, partition) { |
0f4ac132 | 286 | if (!nvram_can_remove_partition(part, name, sig, exceptions)) |
fa2b4e54 BH |
287 | continue; |
288 | ||
289 | /* Make partition a free partition */ | |
1da177e4 | 290 | part->header.signature = NVRAM_SIG_FREE; |
6024ede9 | 291 | strncpy(part->header.name, "wwwwwwwwwwww", 12); |
1da177e4 | 292 | part->header.checksum = nvram_checksum(&part->header); |
1da177e4 LT |
293 | rc = nvram_write_header(part); |
294 | if (rc <= 0) { | |
fa2b4e54 | 295 | printk(KERN_ERR "nvram_remove_partition: nvram_write failed (%d)\n", rc); |
1da177e4 LT |
296 | return rc; |
297 | } | |
fa2b4e54 | 298 | } |
1da177e4 | 299 | |
fa2b4e54 BH |
300 | /* Merge contiguous ones */ |
301 | prev = NULL; | |
690d1a9b | 302 | list_for_each_entry_safe(part, tmp, &nvram_partitions, partition) { |
fa2b4e54 BH |
303 | if (part->header.signature != NVRAM_SIG_FREE) { |
304 | prev = NULL; | |
305 | continue; | |
306 | } | |
307 | if (prev) { | |
308 | prev->header.length += part->header.length; | |
309 | prev->header.checksum = nvram_checksum(&part->header); | |
310 | rc = nvram_write_header(part); | |
311 | if (rc <= 0) { | |
312 | printk(KERN_ERR "nvram_remove_partition: nvram_write failed (%d)\n", rc); | |
313 | return rc; | |
314 | } | |
315 | list_del(&part->partition); | |
316 | kfree(part); | |
317 | } else | |
318 | prev = part; | |
1da177e4 LT |
319 | } |
320 | ||
321 | return 0; | |
322 | } | |
323 | ||
4e7c77a3 BH |
324 | /** |
325 | * nvram_create_partition - Create a partition in nvram | |
326 | * @name: name of the partition to create | |
327 | * @sig: signature of the partition to create | |
36673307 | 328 | * @req_size: size of data to allocate in bytes |
4e7c77a3 | 329 | * @min_size: minimum acceptable size (0 means req_size) |
e49e2e87 BH |
330 | * |
331 | * Returns a negative error code or a positive nvram index | |
332 | * of the beginning of the data area of the newly created | |
333 | * partition. If you provided a min_size smaller than req_size | |
334 | * you need to query for the actual size yourself after the | |
335 | * call using nvram_partition_get_size(). | |
1da177e4 | 336 | */ |
edc79a2f BH |
337 | loff_t __init nvram_create_partition(const char *name, int sig, |
338 | int req_size, int min_size) | |
1da177e4 | 339 | { |
a341ad97 AB |
340 | struct nvram_partition *part; |
341 | struct nvram_partition *new_part; | |
0339ad77 | 342 | struct nvram_partition *free_part = NULL; |
cef0d5ad | 343 | static char nv_init_vals[16]; |
1da177e4 LT |
344 | loff_t tmp_index; |
345 | long size = 0; | |
346 | int rc; | |
4e7c77a3 | 347 | |
36673307 BH |
348 | /* Convert sizes from bytes to blocks */ |
349 | req_size = _ALIGN_UP(req_size, NVRAM_BLOCK_LEN) / NVRAM_BLOCK_LEN; | |
350 | min_size = _ALIGN_UP(min_size, NVRAM_BLOCK_LEN) / NVRAM_BLOCK_LEN; | |
351 | ||
4e7c77a3 BH |
352 | /* If no minimum size specified, make it the same as the |
353 | * requested size | |
354 | */ | |
355 | if (min_size == 0) | |
356 | min_size = req_size; | |
e49e2e87 BH |
357 | if (min_size > req_size) |
358 | return -EINVAL; | |
4e7c77a3 | 359 | |
36673307 BH |
360 | /* Now add one block to each for the header */ |
361 | req_size += 1; | |
362 | min_size += 1; | |
363 | ||
1da177e4 LT |
364 | /* Find a free partition that will give us the maximum needed size |
365 | If can't find one that will give us the minimum size needed */ | |
690d1a9b | 366 | list_for_each_entry(part, &nvram_partitions, partition) { |
1da177e4 LT |
367 | if (part->header.signature != NVRAM_SIG_FREE) |
368 | continue; | |
369 | ||
4e7c77a3 BH |
370 | if (part->header.length >= req_size) { |
371 | size = req_size; | |
1da177e4 LT |
372 | free_part = part; |
373 | break; | |
374 | } | |
4e7c77a3 BH |
375 | if (part->header.length > size && |
376 | part->header.length >= min_size) { | |
377 | size = part->header.length; | |
1da177e4 LT |
378 | free_part = part; |
379 | } | |
380 | } | |
0339ad77 | 381 | if (!size) |
1da177e4 | 382 | return -ENOSPC; |
1da177e4 LT |
383 | |
384 | /* Create our OS partition */ | |
0339ad77 | 385 | new_part = kmalloc(sizeof(*new_part), GFP_KERNEL); |
1da177e4 | 386 | if (!new_part) { |
e49e2e87 | 387 | pr_err("nvram_create_os_partition: kmalloc failed\n"); |
1da177e4 LT |
388 | return -ENOMEM; |
389 | } | |
390 | ||
391 | new_part->index = free_part->index; | |
4e7c77a3 | 392 | new_part->header.signature = sig; |
1da177e4 | 393 | new_part->header.length = size; |
4e7c77a3 | 394 | strncpy(new_part->header.name, name, 12); |
1da177e4 LT |
395 | new_part->header.checksum = nvram_checksum(&new_part->header); |
396 | ||
397 | rc = nvram_write_header(new_part); | |
398 | if (rc <= 0) { | |
e49e2e87 BH |
399 | pr_err("nvram_create_os_partition: nvram_write_header " |
400 | "failed (%d)\n", rc); | |
1da177e4 LT |
401 | return rc; |
402 | } | |
e49e2e87 BH |
403 | list_add_tail(&new_part->partition, &free_part->partition); |
404 | ||
405 | /* Adjust or remove the partition we stole the space from */ | |
406 | if (free_part->header.length > size) { | |
407 | free_part->index += size * NVRAM_BLOCK_LEN; | |
408 | free_part->header.length -= size; | |
409 | free_part->header.checksum = nvram_checksum(&free_part->header); | |
410 | rc = nvram_write_header(free_part); | |
411 | if (rc <= 0) { | |
412 | pr_err("nvram_create_os_partition: nvram_write_header " | |
413 | "failed (%d)\n", rc); | |
414 | return rc; | |
415 | } | |
416 | } else { | |
417 | list_del(&free_part->partition); | |
418 | kfree(free_part); | |
419 | } | |
1da177e4 | 420 | |
e49e2e87 | 421 | /* Clear the new partition */ |
cef0d5ad BH |
422 | for (tmp_index = new_part->index + NVRAM_HEADER_LEN; |
423 | tmp_index < ((size - 1) * NVRAM_BLOCK_LEN); | |
424 | tmp_index += NVRAM_BLOCK_LEN) { | |
425 | rc = ppc_md.nvram_write(nv_init_vals, NVRAM_BLOCK_LEN, &tmp_index); | |
426 | if (rc <= 0) { | |
427 | pr_err("nvram_create_partition: nvram_write failed (%d)\n", rc); | |
428 | return rc; | |
429 | } | |
1da177e4 LT |
430 | } |
431 | ||
e49e2e87 BH |
432 | return new_part->index + NVRAM_HEADER_LEN; |
433 | } | |
1da177e4 | 434 | |
e49e2e87 BH |
435 | /** |
436 | * nvram_get_partition_size - Get the data size of an nvram partition | |
437 | * @data_index: This is the offset of the start of the data of | |
438 | * the partition. The same value that is returned by | |
439 | * nvram_create_partition(). | |
440 | */ | |
edc79a2f | 441 | int nvram_get_partition_size(loff_t data_index) |
e49e2e87 BH |
442 | { |
443 | struct nvram_partition *part; | |
1da177e4 | 444 | |
690d1a9b | 445 | list_for_each_entry(part, &nvram_partitions, partition) { |
e49e2e87 BH |
446 | if (part->index + NVRAM_HEADER_LEN == data_index) |
447 | return (part->header.length - 1) * NVRAM_BLOCK_LEN; | |
1da177e4 | 448 | } |
e49e2e87 | 449 | return -1; |
1da177e4 LT |
450 | } |
451 | ||
452 | ||
cf5cbf9f BH |
453 | /** |
454 | * nvram_find_partition - Find an nvram partition by signature and name | |
455 | * @name: Name of the partition or NULL for any name | |
456 | * @sig: Signature to test against | |
457 | * @out_size: if non-NULL, returns the size of the data part of the partition | |
458 | */ | |
459 | loff_t nvram_find_partition(const char *name, int sig, int *out_size) | |
460 | { | |
461 | struct nvram_partition *p; | |
462 | ||
690d1a9b | 463 | list_for_each_entry(p, &nvram_partitions, partition) { |
cf5cbf9f BH |
464 | if (p->header.signature == sig && |
465 | (!name || !strncmp(p->header.name, name, 12))) { | |
466 | if (out_size) | |
467 | *out_size = (p->header.length - 1) * | |
468 | NVRAM_BLOCK_LEN; | |
469 | return p->index + NVRAM_HEADER_LEN; | |
470 | } | |
471 | } | |
472 | return 0; | |
473 | } | |
474 | ||
edc79a2f | 475 | int __init nvram_scan_partitions(void) |
1da177e4 LT |
476 | { |
477 | loff_t cur_index = 0; | |
478 | struct nvram_header phead; | |
479 | struct nvram_partition * tmp_part; | |
480 | unsigned char c_sum; | |
481 | char * header; | |
482 | int total_size; | |
483 | int err; | |
484 | ||
edc79a2f | 485 | if (ppc_md.nvram_size == NULL || ppc_md.nvram_size() <= 0) |
1da177e4 LT |
486 | return -ENODEV; |
487 | total_size = ppc_md.nvram_size(); | |
488 | ||
5cbded58 | 489 | header = kmalloc(NVRAM_HEADER_LEN, GFP_KERNEL); |
1da177e4 LT |
490 | if (!header) { |
491 | printk(KERN_ERR "nvram_scan_partitions: Failed kmalloc\n"); | |
492 | return -ENOMEM; | |
493 | } | |
494 | ||
495 | while (cur_index < total_size) { | |
496 | ||
497 | err = ppc_md.nvram_read(header, NVRAM_HEADER_LEN, &cur_index); | |
498 | if (err != NVRAM_HEADER_LEN) { | |
499 | printk(KERN_ERR "nvram_scan_partitions: Error parsing " | |
500 | "nvram partitions\n"); | |
501 | goto out; | |
502 | } | |
503 | ||
504 | cur_index -= NVRAM_HEADER_LEN; /* nvram_read will advance us */ | |
505 | ||
506 | memcpy(&phead, header, NVRAM_HEADER_LEN); | |
507 | ||
508 | err = 0; | |
509 | c_sum = nvram_checksum(&phead); | |
510 | if (c_sum != phead.checksum) { | |
511 | printk(KERN_WARNING "WARNING: nvram partition checksum" | |
512 | " was %02x, should be %02x!\n", | |
513 | phead.checksum, c_sum); | |
514 | printk(KERN_WARNING "Terminating nvram partition scan\n"); | |
515 | goto out; | |
516 | } | |
517 | if (!phead.length) { | |
518 | printk(KERN_WARNING "WARNING: nvram corruption " | |
519 | "detected: 0-length partition\n"); | |
520 | goto out; | |
521 | } | |
6e51c9ff | 522 | tmp_part = kmalloc(sizeof(struct nvram_partition), GFP_KERNEL); |
1da177e4 LT |
523 | err = -ENOMEM; |
524 | if (!tmp_part) { | |
525 | printk(KERN_ERR "nvram_scan_partitions: kmalloc failed\n"); | |
526 | goto out; | |
527 | } | |
528 | ||
529 | memcpy(&tmp_part->header, &phead, NVRAM_HEADER_LEN); | |
530 | tmp_part->index = cur_index; | |
690d1a9b | 531 | list_add_tail(&tmp_part->partition, &nvram_partitions); |
1da177e4 LT |
532 | |
533 | cur_index += phead.length * NVRAM_BLOCK_LEN; | |
534 | } | |
535 | err = 0; | |
536 | ||
edc79a2f BH |
537 | #ifdef DEBUG_NVRAM |
538 | nvram_print_partitions("NVRAM Partitions"); | |
539 | #endif | |
540 | ||
1da177e4 LT |
541 | out: |
542 | kfree(header); | |
543 | return err; | |
544 | } | |
545 | ||
546 | static int __init nvram_init(void) | |
547 | { | |
1da177e4 LT |
548 | int rc; |
549 | ||
578914cf BH |
550 | BUILD_BUG_ON(NVRAM_BLOCK_LEN != 16); |
551 | ||
1da177e4 LT |
552 | if (ppc_md.nvram_size == NULL || ppc_md.nvram_size() <= 0) |
553 | return -ENODEV; | |
554 | ||
555 | rc = misc_register(&nvram_dev); | |
556 | if (rc != 0) { | |
557 | printk(KERN_ERR "nvram_init: failed to register device\n"); | |
558 | return rc; | |
559 | } | |
560 | ||
1da177e4 LT |
561 | return rc; |
562 | } | |
563 | ||
564 | void __exit nvram_cleanup(void) | |
565 | { | |
566 | misc_deregister( &nvram_dev ); | |
567 | } | |
568 | ||
1da177e4 LT |
569 | module_init(nvram_init); |
570 | module_exit(nvram_cleanup); | |
571 | MODULE_LICENSE("GPL"); |