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1da177e4 LT |
1 | /* |
2 | * CMOS/NV-RAM driver for Linux | |
3 | * | |
4 | * Copyright (C) 1997 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de> | |
5 | * idea by and with help from Richard Jelinek <rj@suse.de> | |
6 | * Portions copyright (c) 2001,2002 Sun Microsystems (thockin@sun.com) | |
7 | * | |
8 | * This driver allows you to access the contents of the non-volatile memory in | |
9 | * the mc146818rtc.h real-time clock. This chip is built into all PCs and into | |
10 | * many Atari machines. In the former it's called "CMOS-RAM", in the latter | |
11 | * "NVRAM" (NV stands for non-volatile). | |
12 | * | |
13 | * The data are supplied as a (seekable) character device, /dev/nvram. The | |
14 | * size of this file is dependent on the controller. The usual size is 114, | |
15 | * the number of freely available bytes in the memory (i.e., not used by the | |
16 | * RTC itself). | |
17 | * | |
18 | * Checksums over the NVRAM contents are managed by this driver. In case of a | |
19 | * bad checksum, reads and writes return -EIO. The checksum can be initialized | |
20 | * to a sane state either by ioctl(NVRAM_INIT) (clear whole NVRAM) or | |
21 | * ioctl(NVRAM_SETCKS) (doesn't change contents, just makes checksum valid | |
22 | * again; use with care!) | |
23 | * | |
24 | * This file also provides some functions for other parts of the kernel that | |
25 | * want to access the NVRAM: nvram_{read,write,check_checksum,set_checksum}. | |
26 | * Obviously this can be used only if this driver is always configured into | |
27 | * the kernel and is not a module. Since the functions are used by some Atari | |
28 | * drivers, this is the case on the Atari. | |
29 | * | |
30 | * | |
31 | * 1.1 Cesar Barros: SMP locking fixes | |
32 | * added changelog | |
33 | * 1.2 Erik Gilling: Cobalt Networks support | |
34 | * Tim Hockin: general cleanup, Cobalt support | |
dd5b295f JR |
35 | * 1.3 Jon Ringle: Comdial MP1000 support |
36 | * | |
1da177e4 LT |
37 | */ |
38 | ||
dd5b295f | 39 | #define NVRAM_VERSION "1.3" |
1da177e4 LT |
40 | |
41 | #include <linux/module.h> | |
42 | #include <linux/config.h> | |
43 | #include <linux/sched.h> | |
44 | #include <linux/smp_lock.h> | |
45 | #include <linux/nvram.h> | |
46 | ||
47 | #define PC 1 | |
48 | #define ATARI 2 | |
49 | #define COBALT 3 | |
dd5b295f | 50 | #define MP1000 4 |
1da177e4 LT |
51 | |
52 | /* select machine configuration */ | |
53 | #if defined(CONFIG_ATARI) | |
54 | # define MACH ATARI | |
55 | #elif defined(__i386__) || defined(__x86_64__) || defined(__arm__) /* and others?? */ | |
56 | #define MACH PC | |
57 | # if defined(CONFIG_COBALT) | |
58 | # include <linux/cobalt-nvram.h> | |
59 | # define MACH COBALT | |
dd5b295f JR |
60 | # elif defined(CONFIG_MACH_MP1000) |
61 | # undef MACH | |
62 | # define MACH MP1000 | |
1da177e4 LT |
63 | # else |
64 | # define MACH PC | |
65 | # endif | |
66 | #else | |
67 | # error Cannot build nvram driver for this machine configuration. | |
68 | #endif | |
69 | ||
70 | #if MACH == PC | |
71 | ||
72 | /* RTC in a PC */ | |
73 | #define CHECK_DRIVER_INIT() 1 | |
74 | ||
75 | /* On PCs, the checksum is built only over bytes 2..31 */ | |
76 | #define PC_CKS_RANGE_START 2 | |
77 | #define PC_CKS_RANGE_END 31 | |
78 | #define PC_CKS_LOC 32 | |
79 | #define NVRAM_BYTES (128-NVRAM_FIRST_BYTE) | |
80 | ||
81 | #define mach_check_checksum pc_check_checksum | |
82 | #define mach_set_checksum pc_set_checksum | |
83 | #define mach_proc_infos pc_proc_infos | |
84 | ||
85 | #endif | |
86 | ||
87 | #if MACH == COBALT | |
88 | ||
89 | #define CHECK_DRIVER_INIT() 1 | |
90 | ||
91 | #define NVRAM_BYTES (128-NVRAM_FIRST_BYTE) | |
92 | ||
93 | #define mach_check_checksum cobalt_check_checksum | |
94 | #define mach_set_checksum cobalt_set_checksum | |
95 | #define mach_proc_infos cobalt_proc_infos | |
96 | ||
97 | #endif | |
98 | ||
99 | #if MACH == ATARI | |
100 | ||
101 | /* Special parameters for RTC in Atari machines */ | |
102 | #include <asm/atarihw.h> | |
103 | #include <asm/atariints.h> | |
104 | #define RTC_PORT(x) (TT_RTC_BAS + 2*(x)) | |
105 | #define CHECK_DRIVER_INIT() (MACH_IS_ATARI && ATARIHW_PRESENT(TT_CLK)) | |
106 | ||
107 | #define NVRAM_BYTES 50 | |
108 | ||
109 | /* On Ataris, the checksum is over all bytes except the checksum bytes | |
110 | * themselves; these are at the very end */ | |
111 | #define ATARI_CKS_RANGE_START 0 | |
112 | #define ATARI_CKS_RANGE_END 47 | |
113 | #define ATARI_CKS_LOC 48 | |
114 | ||
115 | #define mach_check_checksum atari_check_checksum | |
116 | #define mach_set_checksum atari_set_checksum | |
117 | #define mach_proc_infos atari_proc_infos | |
118 | ||
119 | #endif | |
120 | ||
dd5b295f JR |
121 | #if MACH == MP1000 |
122 | ||
123 | /* RTC in a MP1000 */ | |
124 | #define CHECK_DRIVER_INIT() 1 | |
125 | ||
126 | #define MP1000_CKS_RANGE_START 0 | |
127 | #define MP1000_CKS_RANGE_END 111 | |
128 | #define MP1000_CKS_LOC 112 | |
129 | ||
130 | #define NVRAM_BYTES (128-NVRAM_FIRST_BYTE) | |
131 | ||
132 | #define mach_check_checksum mp1000_check_checksum | |
133 | #define mach_set_checksum mp1000_set_checksum | |
134 | #define mach_proc_infos mp1000_proc_infos | |
135 | ||
136 | #endif | |
137 | ||
1da177e4 LT |
138 | /* Note that *all* calls to CMOS_READ and CMOS_WRITE must be done with |
139 | * rtc_lock held. Due to the index-port/data-port design of the RTC, we | |
140 | * don't want two different things trying to get to it at once. (e.g. the | |
141 | * periodic 11 min sync from time.c vs. this driver.) | |
142 | */ | |
143 | ||
144 | #include <linux/types.h> | |
145 | #include <linux/errno.h> | |
146 | #include <linux/miscdevice.h> | |
147 | #include <linux/slab.h> | |
148 | #include <linux/ioport.h> | |
149 | #include <linux/fcntl.h> | |
150 | #include <linux/mc146818rtc.h> | |
151 | #include <linux/init.h> | |
152 | #include <linux/proc_fs.h> | |
153 | #include <linux/spinlock.h> | |
154 | ||
155 | #include <asm/io.h> | |
156 | #include <asm/uaccess.h> | |
157 | #include <asm/system.h> | |
158 | ||
159 | static DEFINE_SPINLOCK(nvram_state_lock); | |
160 | static int nvram_open_cnt; /* #times opened */ | |
161 | static int nvram_open_mode; /* special open modes */ | |
162 | #define NVRAM_WRITE 1 /* opened for writing (exclusive) */ | |
163 | #define NVRAM_EXCL 2 /* opened with O_EXCL */ | |
164 | ||
165 | static int mach_check_checksum(void); | |
166 | static void mach_set_checksum(void); | |
167 | ||
168 | #ifdef CONFIG_PROC_FS | |
169 | static int mach_proc_infos(unsigned char *contents, char *buffer, int *len, | |
170 | off_t *begin, off_t offset, int size); | |
171 | #endif | |
172 | ||
173 | /* | |
174 | * These functions are provided to be called internally or by other parts of | |
175 | * the kernel. It's up to the caller to ensure correct checksum before reading | |
176 | * or after writing (needs to be done only once). | |
177 | * | |
178 | * It is worth noting that these functions all access bytes of general | |
179 | * purpose memory in the NVRAM - that is to say, they all add the | |
180 | * NVRAM_FIRST_BYTE offset. Pass them offsets into NVRAM as if you did not | |
181 | * know about the RTC cruft. | |
182 | */ | |
183 | ||
184 | unsigned char | |
185 | __nvram_read_byte(int i) | |
186 | { | |
187 | return CMOS_READ(NVRAM_FIRST_BYTE + i); | |
188 | } | |
189 | ||
190 | unsigned char | |
191 | nvram_read_byte(int i) | |
192 | { | |
193 | unsigned long flags; | |
194 | unsigned char c; | |
195 | ||
196 | spin_lock_irqsave(&rtc_lock, flags); | |
197 | c = __nvram_read_byte(i); | |
198 | spin_unlock_irqrestore(&rtc_lock, flags); | |
199 | return c; | |
200 | } | |
201 | ||
202 | /* This races nicely with trying to read with checksum checking (nvram_read) */ | |
203 | void | |
204 | __nvram_write_byte(unsigned char c, int i) | |
205 | { | |
206 | CMOS_WRITE(c, NVRAM_FIRST_BYTE + i); | |
207 | } | |
208 | ||
209 | void | |
210 | nvram_write_byte(unsigned char c, int i) | |
211 | { | |
212 | unsigned long flags; | |
213 | ||
214 | spin_lock_irqsave(&rtc_lock, flags); | |
215 | __nvram_write_byte(c, i); | |
216 | spin_unlock_irqrestore(&rtc_lock, flags); | |
217 | } | |
218 | ||
219 | int | |
220 | __nvram_check_checksum(void) | |
221 | { | |
222 | return mach_check_checksum(); | |
223 | } | |
224 | ||
225 | int | |
226 | nvram_check_checksum(void) | |
227 | { | |
228 | unsigned long flags; | |
229 | int rv; | |
230 | ||
231 | spin_lock_irqsave(&rtc_lock, flags); | |
232 | rv = __nvram_check_checksum(); | |
233 | spin_unlock_irqrestore(&rtc_lock, flags); | |
234 | return rv; | |
235 | } | |
236 | ||
681ea4b9 | 237 | static void |
1da177e4 LT |
238 | __nvram_set_checksum(void) |
239 | { | |
240 | mach_set_checksum(); | |
241 | } | |
242 | ||
681ea4b9 | 243 | #if 0 |
1da177e4 LT |
244 | void |
245 | nvram_set_checksum(void) | |
246 | { | |
247 | unsigned long flags; | |
248 | ||
249 | spin_lock_irqsave(&rtc_lock, flags); | |
250 | __nvram_set_checksum(); | |
251 | spin_unlock_irqrestore(&rtc_lock, flags); | |
252 | } | |
681ea4b9 | 253 | #endif /* 0 */ |
1da177e4 LT |
254 | |
255 | /* | |
256 | * The are the file operation function for user access to /dev/nvram | |
257 | */ | |
258 | ||
259 | static loff_t nvram_llseek(struct file *file,loff_t offset, int origin ) | |
260 | { | |
261 | lock_kernel(); | |
262 | switch (origin) { | |
263 | case 0: | |
264 | /* nothing to do */ | |
265 | break; | |
266 | case 1: | |
267 | offset += file->f_pos; | |
268 | break; | |
269 | case 2: | |
270 | offset += NVRAM_BYTES; | |
271 | break; | |
272 | } | |
273 | unlock_kernel(); | |
274 | return (offset >= 0) ? (file->f_pos = offset) : -EINVAL; | |
275 | } | |
276 | ||
277 | static ssize_t | |
278 | nvram_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) | |
279 | { | |
280 | unsigned char contents[NVRAM_BYTES]; | |
281 | unsigned i = *ppos; | |
282 | unsigned char *tmp; | |
283 | ||
284 | spin_lock_irq(&rtc_lock); | |
285 | ||
286 | if (!__nvram_check_checksum()) | |
287 | goto checksum_err; | |
288 | ||
289 | for (tmp = contents; count-- > 0 && i < NVRAM_BYTES; ++i, ++tmp) | |
290 | *tmp = __nvram_read_byte(i); | |
291 | ||
292 | spin_unlock_irq(&rtc_lock); | |
293 | ||
294 | if (copy_to_user(buf, contents, tmp - contents)) | |
295 | return -EFAULT; | |
296 | ||
297 | *ppos = i; | |
298 | ||
299 | return tmp - contents; | |
300 | ||
301 | checksum_err: | |
302 | spin_unlock_irq(&rtc_lock); | |
303 | return -EIO; | |
304 | } | |
305 | ||
306 | static ssize_t | |
307 | nvram_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) | |
308 | { | |
309 | unsigned char contents[NVRAM_BYTES]; | |
310 | unsigned i = *ppos; | |
311 | unsigned char *tmp; | |
312 | int len; | |
313 | ||
314 | len = (NVRAM_BYTES - i) < count ? (NVRAM_BYTES - i) : count; | |
315 | if (copy_from_user(contents, buf, len)) | |
316 | return -EFAULT; | |
317 | ||
318 | spin_lock_irq(&rtc_lock); | |
319 | ||
320 | if (!__nvram_check_checksum()) | |
321 | goto checksum_err; | |
322 | ||
323 | for (tmp = contents; count-- > 0 && i < NVRAM_BYTES; ++i, ++tmp) | |
324 | __nvram_write_byte(*tmp, i); | |
325 | ||
326 | __nvram_set_checksum(); | |
327 | ||
328 | spin_unlock_irq(&rtc_lock); | |
329 | ||
330 | *ppos = i; | |
331 | ||
332 | return tmp - contents; | |
333 | ||
334 | checksum_err: | |
335 | spin_unlock_irq(&rtc_lock); | |
336 | return -EIO; | |
337 | } | |
338 | ||
339 | static int | |
340 | nvram_ioctl(struct inode *inode, struct file *file, | |
341 | unsigned int cmd, unsigned long arg) | |
342 | { | |
343 | int i; | |
344 | ||
345 | switch (cmd) { | |
346 | ||
347 | case NVRAM_INIT: | |
348 | /* initialize NVRAM contents and checksum */ | |
349 | if (!capable(CAP_SYS_ADMIN)) | |
350 | return -EACCES; | |
351 | ||
352 | spin_lock_irq(&rtc_lock); | |
353 | ||
354 | for (i = 0; i < NVRAM_BYTES; ++i) | |
355 | __nvram_write_byte(0, i); | |
356 | __nvram_set_checksum(); | |
357 | ||
358 | spin_unlock_irq(&rtc_lock); | |
359 | return 0; | |
360 | ||
361 | case NVRAM_SETCKS: | |
362 | /* just set checksum, contents unchanged (maybe useful after | |
363 | * checksum garbaged somehow...) */ | |
364 | if (!capable(CAP_SYS_ADMIN)) | |
365 | return -EACCES; | |
366 | ||
367 | spin_lock_irq(&rtc_lock); | |
368 | __nvram_set_checksum(); | |
369 | spin_unlock_irq(&rtc_lock); | |
370 | return 0; | |
371 | ||
372 | default: | |
373 | return -ENOTTY; | |
374 | } | |
375 | } | |
376 | ||
377 | static int | |
378 | nvram_open(struct inode *inode, struct file *file) | |
379 | { | |
380 | spin_lock(&nvram_state_lock); | |
381 | ||
382 | if ((nvram_open_cnt && (file->f_flags & O_EXCL)) || | |
383 | (nvram_open_mode & NVRAM_EXCL) || | |
384 | ((file->f_mode & 2) && (nvram_open_mode & NVRAM_WRITE))) { | |
385 | spin_unlock(&nvram_state_lock); | |
386 | return -EBUSY; | |
387 | } | |
388 | ||
389 | if (file->f_flags & O_EXCL) | |
390 | nvram_open_mode |= NVRAM_EXCL; | |
391 | if (file->f_mode & 2) | |
392 | nvram_open_mode |= NVRAM_WRITE; | |
393 | nvram_open_cnt++; | |
394 | ||
395 | spin_unlock(&nvram_state_lock); | |
396 | ||
397 | return 0; | |
398 | } | |
399 | ||
400 | static int | |
401 | nvram_release(struct inode *inode, struct file *file) | |
402 | { | |
403 | spin_lock(&nvram_state_lock); | |
404 | ||
405 | nvram_open_cnt--; | |
406 | ||
407 | /* if only one instance is open, clear the EXCL bit */ | |
408 | if (nvram_open_mode & NVRAM_EXCL) | |
409 | nvram_open_mode &= ~NVRAM_EXCL; | |
410 | if (file->f_mode & 2) | |
411 | nvram_open_mode &= ~NVRAM_WRITE; | |
412 | ||
413 | spin_unlock(&nvram_state_lock); | |
414 | ||
415 | return 0; | |
416 | } | |
417 | ||
418 | #ifndef CONFIG_PROC_FS | |
419 | static int | |
420 | nvram_read_proc(char *buffer, char **start, off_t offset, | |
421 | int size, int *eof, void *data) | |
422 | { | |
423 | return 0; | |
424 | } | |
425 | #else | |
426 | ||
427 | static int | |
428 | nvram_read_proc(char *buffer, char **start, off_t offset, | |
429 | int size, int *eof, void *data) | |
430 | { | |
431 | unsigned char contents[NVRAM_BYTES]; | |
432 | int i, len = 0; | |
433 | off_t begin = 0; | |
434 | ||
435 | spin_lock_irq(&rtc_lock); | |
436 | for (i = 0; i < NVRAM_BYTES; ++i) | |
437 | contents[i] = __nvram_read_byte(i); | |
438 | spin_unlock_irq(&rtc_lock); | |
439 | ||
440 | *eof = mach_proc_infos(contents, buffer, &len, &begin, offset, size); | |
441 | ||
442 | if (offset >= begin + len) | |
443 | return 0; | |
444 | *start = buffer + (offset - begin); | |
445 | return (size < begin + len - offset) ? size : begin + len - offset; | |
446 | ||
447 | } | |
448 | ||
449 | /* This macro frees the machine specific function from bounds checking and | |
450 | * this like that... */ | |
451 | #define PRINT_PROC(fmt,args...) \ | |
452 | do { \ | |
453 | *len += sprintf(buffer+*len, fmt, ##args); \ | |
454 | if (*begin + *len > offset + size) \ | |
455 | return 0; \ | |
456 | if (*begin + *len < offset) { \ | |
457 | *begin += *len; \ | |
458 | *len = 0; \ | |
459 | } \ | |
460 | } while(0) | |
461 | ||
462 | #endif /* CONFIG_PROC_FS */ | |
463 | ||
464 | static struct file_operations nvram_fops = { | |
465 | .owner = THIS_MODULE, | |
466 | .llseek = nvram_llseek, | |
467 | .read = nvram_read, | |
468 | .write = nvram_write, | |
469 | .ioctl = nvram_ioctl, | |
470 | .open = nvram_open, | |
471 | .release = nvram_release, | |
472 | }; | |
473 | ||
474 | static struct miscdevice nvram_dev = { | |
475 | NVRAM_MINOR, | |
476 | "nvram", | |
477 | &nvram_fops | |
478 | }; | |
479 | ||
480 | static int __init | |
481 | nvram_init(void) | |
482 | { | |
483 | int ret; | |
484 | ||
485 | /* First test whether the driver should init at all */ | |
486 | if (!CHECK_DRIVER_INIT()) | |
487 | return -ENXIO; | |
488 | ||
489 | ret = misc_register(&nvram_dev); | |
490 | if (ret) { | |
491 | printk(KERN_ERR "nvram: can't misc_register on minor=%d\n", | |
492 | NVRAM_MINOR); | |
493 | goto out; | |
494 | } | |
495 | if (!create_proc_read_entry("driver/nvram", 0, NULL, nvram_read_proc, | |
496 | NULL)) { | |
497 | printk(KERN_ERR "nvram: can't create /proc/driver/nvram\n"); | |
498 | ret = -ENOMEM; | |
499 | goto outmisc; | |
500 | } | |
501 | ret = 0; | |
502 | printk(KERN_INFO "Non-volatile memory driver v" NVRAM_VERSION "\n"); | |
503 | out: | |
504 | return ret; | |
505 | outmisc: | |
506 | misc_deregister(&nvram_dev); | |
507 | goto out; | |
508 | } | |
509 | ||
510 | static void __exit | |
511 | nvram_cleanup_module(void) | |
512 | { | |
513 | remove_proc_entry("driver/nvram", NULL); | |
514 | misc_deregister(&nvram_dev); | |
515 | } | |
516 | ||
517 | module_init(nvram_init); | |
518 | module_exit(nvram_cleanup_module); | |
519 | ||
520 | /* | |
521 | * Machine specific functions | |
522 | */ | |
523 | ||
524 | #if MACH == PC | |
525 | ||
526 | static int | |
527 | pc_check_checksum(void) | |
528 | { | |
529 | int i; | |
530 | unsigned short sum = 0; | |
531 | unsigned short expect; | |
532 | ||
533 | for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i) | |
534 | sum += __nvram_read_byte(i); | |
535 | expect = __nvram_read_byte(PC_CKS_LOC)<<8 | | |
536 | __nvram_read_byte(PC_CKS_LOC+1); | |
537 | return ((sum & 0xffff) == expect); | |
538 | } | |
539 | ||
540 | static void | |
541 | pc_set_checksum(void) | |
542 | { | |
543 | int i; | |
544 | unsigned short sum = 0; | |
545 | ||
546 | for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i) | |
547 | sum += __nvram_read_byte(i); | |
548 | __nvram_write_byte(sum >> 8, PC_CKS_LOC); | |
549 | __nvram_write_byte(sum & 0xff, PC_CKS_LOC + 1); | |
550 | } | |
551 | ||
552 | #ifdef CONFIG_PROC_FS | |
553 | ||
554 | static char *floppy_types[] = { | |
555 | "none", "5.25'' 360k", "5.25'' 1.2M", "3.5'' 720k", "3.5'' 1.44M", | |
556 | "3.5'' 2.88M", "3.5'' 2.88M" | |
557 | }; | |
558 | ||
559 | static char *gfx_types[] = { | |
560 | "EGA, VGA, ... (with BIOS)", | |
561 | "CGA (40 cols)", | |
562 | "CGA (80 cols)", | |
563 | "monochrome", | |
564 | }; | |
565 | ||
566 | static int | |
567 | pc_proc_infos(unsigned char *nvram, char *buffer, int *len, | |
568 | off_t *begin, off_t offset, int size) | |
569 | { | |
570 | int checksum; | |
571 | int type; | |
572 | ||
573 | spin_lock_irq(&rtc_lock); | |
574 | checksum = __nvram_check_checksum(); | |
575 | spin_unlock_irq(&rtc_lock); | |
576 | ||
577 | PRINT_PROC("Checksum status: %svalid\n", checksum ? "" : "not "); | |
578 | ||
579 | PRINT_PROC("# floppies : %d\n", | |
580 | (nvram[6] & 1) ? (nvram[6] >> 6) + 1 : 0); | |
581 | PRINT_PROC("Floppy 0 type : "); | |
582 | type = nvram[2] >> 4; | |
583 | if (type < sizeof (floppy_types) / sizeof (*floppy_types)) | |
584 | PRINT_PROC("%s\n", floppy_types[type]); | |
585 | else | |
586 | PRINT_PROC("%d (unknown)\n", type); | |
587 | PRINT_PROC("Floppy 1 type : "); | |
588 | type = nvram[2] & 0x0f; | |
589 | if (type < sizeof (floppy_types) / sizeof (*floppy_types)) | |
590 | PRINT_PROC("%s\n", floppy_types[type]); | |
591 | else | |
592 | PRINT_PROC("%d (unknown)\n", type); | |
593 | ||
594 | PRINT_PROC("HD 0 type : "); | |
595 | type = nvram[4] >> 4; | |
596 | if (type) | |
597 | PRINT_PROC("%02x\n", type == 0x0f ? nvram[11] : type); | |
598 | else | |
599 | PRINT_PROC("none\n"); | |
600 | ||
601 | PRINT_PROC("HD 1 type : "); | |
602 | type = nvram[4] & 0x0f; | |
603 | if (type) | |
604 | PRINT_PROC("%02x\n", type == 0x0f ? nvram[12] : type); | |
605 | else | |
606 | PRINT_PROC("none\n"); | |
607 | ||
608 | PRINT_PROC("HD type 48 data: %d/%d/%d C/H/S, precomp %d, lz %d\n", | |
609 | nvram[18] | (nvram[19] << 8), | |
610 | nvram[20], nvram[25], | |
611 | nvram[21] | (nvram[22] << 8), nvram[23] | (nvram[24] << 8)); | |
612 | PRINT_PROC("HD type 49 data: %d/%d/%d C/H/S, precomp %d, lz %d\n", | |
613 | nvram[39] | (nvram[40] << 8), | |
614 | nvram[41], nvram[46], | |
615 | nvram[42] | (nvram[43] << 8), nvram[44] | (nvram[45] << 8)); | |
616 | ||
617 | PRINT_PROC("DOS base memory: %d kB\n", nvram[7] | (nvram[8] << 8)); | |
618 | PRINT_PROC("Extended memory: %d kB (configured), %d kB (tested)\n", | |
619 | nvram[9] | (nvram[10] << 8), nvram[34] | (nvram[35] << 8)); | |
620 | ||
621 | PRINT_PROC("Gfx adapter : %s\n", gfx_types[(nvram[6] >> 4) & 3]); | |
622 | ||
623 | PRINT_PROC("FPU : %sinstalled\n", | |
624 | (nvram[6] & 2) ? "" : "not "); | |
625 | ||
626 | return 1; | |
627 | } | |
628 | #endif | |
629 | ||
630 | #endif /* MACH == PC */ | |
631 | ||
632 | #if MACH == COBALT | |
633 | ||
634 | /* the cobalt CMOS has a wider range of its checksum */ | |
635 | static int cobalt_check_checksum(void) | |
636 | { | |
637 | int i; | |
638 | unsigned short sum = 0; | |
639 | unsigned short expect; | |
640 | ||
641 | for (i = COBT_CMOS_CKS_START; i <= COBT_CMOS_CKS_END; ++i) { | |
642 | if ((i == COBT_CMOS_CHECKSUM) || (i == (COBT_CMOS_CHECKSUM+1))) | |
643 | continue; | |
644 | ||
645 | sum += __nvram_read_byte(i); | |
646 | } | |
647 | expect = __nvram_read_byte(COBT_CMOS_CHECKSUM) << 8 | | |
648 | __nvram_read_byte(COBT_CMOS_CHECKSUM+1); | |
649 | return ((sum & 0xffff) == expect); | |
650 | } | |
651 | ||
652 | static void cobalt_set_checksum(void) | |
653 | { | |
654 | int i; | |
655 | unsigned short sum = 0; | |
656 | ||
657 | for (i = COBT_CMOS_CKS_START; i <= COBT_CMOS_CKS_END; ++i) { | |
658 | if ((i == COBT_CMOS_CHECKSUM) || (i == (COBT_CMOS_CHECKSUM+1))) | |
659 | continue; | |
660 | ||
661 | sum += __nvram_read_byte(i); | |
662 | } | |
663 | ||
664 | __nvram_write_byte(sum >> 8, COBT_CMOS_CHECKSUM); | |
665 | __nvram_write_byte(sum & 0xff, COBT_CMOS_CHECKSUM+1); | |
666 | } | |
667 | ||
668 | #ifdef CONFIG_PROC_FS | |
669 | ||
670 | static int cobalt_proc_infos(unsigned char *nvram, char *buffer, int *len, | |
671 | off_t *begin, off_t offset, int size) | |
672 | { | |
673 | int i; | |
674 | unsigned int checksum; | |
675 | unsigned int flags; | |
676 | char sernum[14]; | |
677 | char *key = "cNoEbTaWlOtR!"; | |
678 | unsigned char bto_csum; | |
679 | ||
680 | spin_lock_irq(&rtc_lock); | |
681 | checksum = __nvram_check_checksum(); | |
682 | spin_unlock_irq(&rtc_lock); | |
683 | ||
684 | PRINT_PROC("Checksum status: %svalid\n", checksum ? "" : "not "); | |
685 | ||
686 | flags = nvram[COBT_CMOS_FLAG_BYTE_0] << 8 | |
687 | | nvram[COBT_CMOS_FLAG_BYTE_1]; | |
688 | ||
689 | PRINT_PROC("Console: %s\n", | |
690 | flags & COBT_CMOS_CONSOLE_FLAG ? "on": "off"); | |
691 | ||
692 | PRINT_PROC("Firmware Debug Messages: %s\n", | |
693 | flags & COBT_CMOS_DEBUG_FLAG ? "on": "off"); | |
694 | ||
695 | PRINT_PROC("Auto Prompt: %s\n", | |
696 | flags & COBT_CMOS_AUTO_PROMPT_FLAG ? "on": "off"); | |
697 | ||
698 | PRINT_PROC("Shutdown Status: %s\n", | |
699 | flags & COBT_CMOS_CLEAN_BOOT_FLAG ? "clean": "dirty"); | |
700 | ||
701 | PRINT_PROC("Hardware Probe: %s\n", | |
702 | flags & COBT_CMOS_HW_NOPROBE_FLAG ? "partial": "full"); | |
703 | ||
704 | PRINT_PROC("System Fault: %sdetected\n", | |
705 | flags & COBT_CMOS_SYSFAULT_FLAG ? "": "not "); | |
706 | ||
707 | PRINT_PROC("Panic on OOPS: %s\n", | |
708 | flags & COBT_CMOS_OOPSPANIC_FLAG ? "yes": "no"); | |
709 | ||
710 | PRINT_PROC("Delayed Cache Initialization: %s\n", | |
711 | flags & COBT_CMOS_DELAY_CACHE_FLAG ? "yes": "no"); | |
712 | ||
713 | PRINT_PROC("Show Logo at Boot: %s\n", | |
714 | flags & COBT_CMOS_NOLOGO_FLAG ? "no": "yes"); | |
715 | ||
716 | PRINT_PROC("Boot Method: "); | |
717 | switch (nvram[COBT_CMOS_BOOT_METHOD]) { | |
718 | case COBT_CMOS_BOOT_METHOD_DISK: | |
719 | PRINT_PROC("disk\n"); | |
720 | break; | |
721 | ||
722 | case COBT_CMOS_BOOT_METHOD_ROM: | |
723 | PRINT_PROC("rom\n"); | |
724 | break; | |
725 | ||
726 | case COBT_CMOS_BOOT_METHOD_NET: | |
727 | PRINT_PROC("net\n"); | |
728 | break; | |
729 | ||
730 | default: | |
731 | PRINT_PROC("unknown\n"); | |
732 | break; | |
733 | } | |
734 | ||
735 | PRINT_PROC("Primary Boot Device: %d:%d\n", | |
736 | nvram[COBT_CMOS_BOOT_DEV0_MAJ], | |
737 | nvram[COBT_CMOS_BOOT_DEV0_MIN] ); | |
738 | PRINT_PROC("Secondary Boot Device: %d:%d\n", | |
739 | nvram[COBT_CMOS_BOOT_DEV1_MAJ], | |
740 | nvram[COBT_CMOS_BOOT_DEV1_MIN] ); | |
741 | PRINT_PROC("Tertiary Boot Device: %d:%d\n", | |
742 | nvram[COBT_CMOS_BOOT_DEV2_MAJ], | |
743 | nvram[COBT_CMOS_BOOT_DEV2_MIN] ); | |
744 | ||
745 | PRINT_PROC("Uptime: %d\n", | |
746 | nvram[COBT_CMOS_UPTIME_0] << 24 | | |
747 | nvram[COBT_CMOS_UPTIME_1] << 16 | | |
748 | nvram[COBT_CMOS_UPTIME_2] << 8 | | |
749 | nvram[COBT_CMOS_UPTIME_3]); | |
750 | ||
751 | PRINT_PROC("Boot Count: %d\n", | |
752 | nvram[COBT_CMOS_BOOTCOUNT_0] << 24 | | |
753 | nvram[COBT_CMOS_BOOTCOUNT_1] << 16 | | |
754 | nvram[COBT_CMOS_BOOTCOUNT_2] << 8 | | |
755 | nvram[COBT_CMOS_BOOTCOUNT_3]); | |
756 | ||
757 | /* 13 bytes of serial num */ | |
758 | for (i=0 ; i<13 ; i++) { | |
759 | sernum[i] = nvram[COBT_CMOS_SYS_SERNUM_0 + i]; | |
760 | } | |
761 | sernum[13] = '\0'; | |
762 | ||
763 | checksum = 0; | |
764 | for (i=0 ; i<13 ; i++) { | |
765 | checksum += sernum[i] ^ key[i]; | |
766 | } | |
767 | checksum = ((checksum & 0x7f) ^ (0xd6)) & 0xff; | |
768 | ||
769 | PRINT_PROC("Serial Number: %s", sernum); | |
770 | if (checksum != nvram[COBT_CMOS_SYS_SERNUM_CSUM]) { | |
771 | PRINT_PROC(" (invalid checksum)"); | |
772 | } | |
773 | PRINT_PROC("\n"); | |
774 | ||
775 | PRINT_PROC("Rom Revison: %d.%d.%d\n", nvram[COBT_CMOS_ROM_REV_MAJ], | |
776 | nvram[COBT_CMOS_ROM_REV_MIN], nvram[COBT_CMOS_ROM_REV_REV]); | |
777 | ||
778 | PRINT_PROC("BTO Server: %d.%d.%d.%d", nvram[COBT_CMOS_BTO_IP_0], | |
779 | nvram[COBT_CMOS_BTO_IP_1], nvram[COBT_CMOS_BTO_IP_2], | |
780 | nvram[COBT_CMOS_BTO_IP_3]); | |
781 | bto_csum = nvram[COBT_CMOS_BTO_IP_0] + nvram[COBT_CMOS_BTO_IP_1] | |
782 | + nvram[COBT_CMOS_BTO_IP_2] + nvram[COBT_CMOS_BTO_IP_3]; | |
783 | if (bto_csum != nvram[COBT_CMOS_BTO_IP_CSUM]) { | |
784 | PRINT_PROC(" (invalid checksum)"); | |
785 | } | |
786 | PRINT_PROC("\n"); | |
787 | ||
788 | if (flags & COBT_CMOS_VERSION_FLAG | |
789 | && nvram[COBT_CMOS_VERSION] >= COBT_CMOS_VER_BTOCODE) { | |
790 | PRINT_PROC("BTO Code: 0x%x\n", | |
791 | nvram[COBT_CMOS_BTO_CODE_0] << 24 | | |
792 | nvram[COBT_CMOS_BTO_CODE_1] << 16 | | |
793 | nvram[COBT_CMOS_BTO_CODE_2] << 8 | | |
794 | nvram[COBT_CMOS_BTO_CODE_3]); | |
795 | } | |
796 | ||
797 | return 1; | |
798 | } | |
799 | #endif /* CONFIG_PROC_FS */ | |
800 | ||
801 | #endif /* MACH == COBALT */ | |
802 | ||
803 | #if MACH == ATARI | |
804 | ||
805 | static int | |
806 | atari_check_checksum(void) | |
807 | { | |
808 | int i; | |
809 | unsigned char sum = 0; | |
810 | ||
811 | for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i) | |
812 | sum += __nvram_read_byte(i); | |
813 | return (__nvram_read_byte(ATARI_CKS_LOC) == (~sum & 0xff) && | |
814 | __nvram_read_byte(ATARI_CKS_LOC + 1) == (sum & 0xff)); | |
815 | } | |
816 | ||
817 | static void | |
818 | atari_set_checksum(void) | |
819 | { | |
820 | int i; | |
821 | unsigned char sum = 0; | |
822 | ||
823 | for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i) | |
824 | sum += __nvram_read_byte(i); | |
825 | __nvram_write_byte(~sum, ATARI_CKS_LOC); | |
826 | __nvram_write_byte(sum, ATARI_CKS_LOC + 1); | |
827 | } | |
828 | ||
829 | #ifdef CONFIG_PROC_FS | |
830 | ||
831 | static struct { | |
832 | unsigned char val; | |
833 | char *name; | |
834 | } boot_prefs[] = { | |
835 | { 0x80, "TOS" }, | |
836 | { 0x40, "ASV" }, | |
837 | { 0x20, "NetBSD (?)" }, | |
838 | { 0x10, "Linux" }, | |
839 | { 0x00, "unspecified" } | |
840 | }; | |
841 | ||
842 | static char *languages[] = { | |
843 | "English (US)", | |
844 | "German", | |
845 | "French", | |
846 | "English (UK)", | |
847 | "Spanish", | |
848 | "Italian", | |
849 | "6 (undefined)", | |
850 | "Swiss (French)", | |
851 | "Swiss (German)" | |
852 | }; | |
853 | ||
854 | static char *dateformat[] = { | |
855 | "MM%cDD%cYY", | |
856 | "DD%cMM%cYY", | |
857 | "YY%cMM%cDD", | |
858 | "YY%cDD%cMM", | |
859 | "4 (undefined)", | |
860 | "5 (undefined)", | |
861 | "6 (undefined)", | |
862 | "7 (undefined)" | |
863 | }; | |
864 | ||
865 | static char *colors[] = { | |
866 | "2", "4", "16", "256", "65536", "??", "??", "??" | |
867 | }; | |
868 | ||
869 | #define fieldsize(a) (sizeof(a)/sizeof(*a)) | |
870 | ||
871 | static int | |
872 | atari_proc_infos(unsigned char *nvram, char *buffer, int *len, | |
873 | off_t *begin, off_t offset, int size) | |
874 | { | |
875 | int checksum = nvram_check_checksum(); | |
876 | int i; | |
877 | unsigned vmode; | |
878 | ||
879 | PRINT_PROC("Checksum status : %svalid\n", checksum ? "" : "not "); | |
880 | ||
881 | PRINT_PROC("Boot preference : "); | |
882 | for (i = fieldsize(boot_prefs) - 1; i >= 0; --i) { | |
883 | if (nvram[1] == boot_prefs[i].val) { | |
884 | PRINT_PROC("%s\n", boot_prefs[i].name); | |
885 | break; | |
886 | } | |
887 | } | |
888 | if (i < 0) | |
889 | PRINT_PROC("0x%02x (undefined)\n", nvram[1]); | |
890 | ||
891 | PRINT_PROC("SCSI arbitration : %s\n", | |
892 | (nvram[16] & 0x80) ? "on" : "off"); | |
893 | PRINT_PROC("SCSI host ID : "); | |
894 | if (nvram[16] & 0x80) | |
895 | PRINT_PROC("%d\n", nvram[16] & 7); | |
896 | else | |
897 | PRINT_PROC("n/a\n"); | |
898 | ||
899 | /* the following entries are defined only for the Falcon */ | |
900 | if ((atari_mch_cookie >> 16) != ATARI_MCH_FALCON) | |
901 | return 1; | |
902 | ||
903 | PRINT_PROC("OS language : "); | |
904 | if (nvram[6] < fieldsize(languages)) | |
905 | PRINT_PROC("%s\n", languages[nvram[6]]); | |
906 | else | |
907 | PRINT_PROC("%u (undefined)\n", nvram[6]); | |
908 | PRINT_PROC("Keyboard language: "); | |
909 | if (nvram[7] < fieldsize(languages)) | |
910 | PRINT_PROC("%s\n", languages[nvram[7]]); | |
911 | else | |
912 | PRINT_PROC("%u (undefined)\n", nvram[7]); | |
913 | PRINT_PROC("Date format : "); | |
914 | PRINT_PROC(dateformat[nvram[8] & 7], | |
915 | nvram[9] ? nvram[9] : '/', nvram[9] ? nvram[9] : '/'); | |
916 | PRINT_PROC(", %dh clock\n", nvram[8] & 16 ? 24 : 12); | |
917 | PRINT_PROC("Boot delay : "); | |
918 | if (nvram[10] == 0) | |
919 | PRINT_PROC("default"); | |
920 | else | |
921 | PRINT_PROC("%ds%s\n", nvram[10], | |
922 | nvram[10] < 8 ? ", no memory test" : ""); | |
923 | ||
924 | vmode = (nvram[14] << 8) || nvram[15]; | |
925 | PRINT_PROC("Video mode : %s colors, %d columns, %s %s monitor\n", | |
926 | colors[vmode & 7], | |
927 | vmode & 8 ? 80 : 40, | |
928 | vmode & 16 ? "VGA" : "TV", vmode & 32 ? "PAL" : "NTSC"); | |
929 | PRINT_PROC(" %soverscan, compat. mode %s%s\n", | |
930 | vmode & 64 ? "" : "no ", | |
931 | vmode & 128 ? "on" : "off", | |
932 | vmode & 256 ? | |
933 | (vmode & 16 ? ", line doubling" : ", half screen") : ""); | |
934 | ||
935 | return 1; | |
936 | } | |
937 | #endif | |
938 | ||
939 | #endif /* MACH == ATARI */ | |
940 | ||
dd5b295f JR |
941 | #if MACH == MP1000 |
942 | ||
943 | static int | |
944 | mp1000_check_checksum(void) | |
945 | { | |
946 | int i; | |
947 | unsigned short sum = 0; | |
948 | unsigned short expect; | |
949 | ||
950 | for (i = MP1000_CKS_RANGE_START; i <= MP1000_CKS_RANGE_END; ++i) | |
951 | sum += __nvram_read_byte(i); | |
952 | ||
953 | expect = __nvram_read_byte(MP1000_CKS_LOC+1)<<8 | | |
954 | __nvram_read_byte(MP1000_CKS_LOC); | |
955 | return ((sum & 0xffff) == expect); | |
956 | } | |
957 | ||
958 | static void | |
959 | mp1000_set_checksum(void) | |
960 | { | |
961 | int i; | |
962 | unsigned short sum = 0; | |
963 | ||
964 | for (i = MP1000_CKS_RANGE_START; i <= MP1000_CKS_RANGE_END; ++i) | |
965 | sum += __nvram_read_byte(i); | |
966 | __nvram_write_byte(sum >> 8, MP1000_CKS_LOC + 1); | |
967 | __nvram_write_byte(sum & 0xff, MP1000_CKS_LOC); | |
968 | } | |
969 | ||
970 | #ifdef CONFIG_PROC_FS | |
971 | ||
972 | #define SERVER_N_LEN 32 | |
973 | #define PATH_N_LEN 32 | |
974 | #define FILE_N_LEN 32 | |
975 | #define NVRAM_MAGIC_SIG 0xdead | |
976 | ||
977 | typedef struct NvRamImage | |
978 | { | |
979 | unsigned short int magic; | |
980 | unsigned short int mode; | |
981 | char fname[FILE_N_LEN]; | |
982 | char path[PATH_N_LEN]; | |
983 | char server[SERVER_N_LEN]; | |
984 | char pad[12]; | |
985 | } NvRam; | |
986 | ||
987 | static int | |
988 | mp1000_proc_infos(unsigned char *nvram, char *buffer, int *len, | |
989 | off_t *begin, off_t offset, int size) | |
990 | { | |
991 | int checksum; | |
992 | NvRam* nv = (NvRam*)nvram; | |
993 | ||
994 | spin_lock_irq(&rtc_lock); | |
995 | checksum = __nvram_check_checksum(); | |
996 | spin_unlock_irq(&rtc_lock); | |
997 | ||
998 | PRINT_PROC("Checksum status: %svalid\n", checksum ? "" : "not "); | |
999 | ||
1000 | switch( nv->mode ) | |
1001 | { | |
1002 | case 0 : | |
1003 | PRINT_PROC( "\tMode 0, tftp prompt\n" ); | |
1004 | break; | |
1005 | case 1 : | |
1006 | PRINT_PROC( "\tMode 1, booting from disk\n" ); | |
1007 | break; | |
1008 | case 2 : | |
1009 | PRINT_PROC( "\tMode 2, Alternate boot from disk /boot/%s\n", nv->fname ); | |
1010 | break; | |
1011 | case 3 : | |
1012 | PRINT_PROC( "\tMode 3, Booting from net:\n" ); | |
1013 | PRINT_PROC( "\t\t%s:%s%s\n",nv->server, nv->path, nv->fname ); | |
1014 | break; | |
1015 | default: | |
1016 | PRINT_PROC( "\tInconsistant nvram?\n" ); | |
1017 | break; | |
1018 | } | |
1019 | ||
1020 | return 1; | |
1021 | } | |
1022 | #endif | |
1023 | ||
1024 | #endif /* MACH == MP1000 */ | |
1025 | ||
1da177e4 LT |
1026 | MODULE_LICENSE("GPL"); |
1027 | ||
1028 | EXPORT_SYMBOL(__nvram_read_byte); | |
1029 | EXPORT_SYMBOL(nvram_read_byte); | |
1030 | EXPORT_SYMBOL(__nvram_write_byte); | |
1031 | EXPORT_SYMBOL(nvram_write_byte); | |
1032 | EXPORT_SYMBOL(__nvram_check_checksum); | |
1033 | EXPORT_SYMBOL(nvram_check_checksum); | |
1da177e4 | 1034 | MODULE_ALIAS_MISCDEV(NVRAM_MINOR); |