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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 | |
35 | */ | |
36 | ||
866237ea | 37 | #define NVRAM_VERSION "1.2" |
1da177e4 LT |
38 | |
39 | #include <linux/module.h> | |
1da177e4 LT |
40 | #include <linux/sched.h> |
41 | #include <linux/smp_lock.h> | |
42 | #include <linux/nvram.h> | |
43 | ||
44 | #define PC 1 | |
45 | #define ATARI 2 | |
46 | #define COBALT 3 | |
47 | ||
48 | /* select machine configuration */ | |
49 | #if defined(CONFIG_ATARI) | |
50 | # define MACH ATARI | |
51 | #elif defined(__i386__) || defined(__x86_64__) || defined(__arm__) /* and others?? */ | |
52 | #define MACH PC | |
53 | # if defined(CONFIG_COBALT) | |
54 | # include <linux/cobalt-nvram.h> | |
55 | # define MACH COBALT | |
56 | # else | |
57 | # define MACH PC | |
58 | # endif | |
59 | #else | |
60 | # error Cannot build nvram driver for this machine configuration. | |
61 | #endif | |
62 | ||
63 | #if MACH == PC | |
64 | ||
65 | /* RTC in a PC */ | |
66 | #define CHECK_DRIVER_INIT() 1 | |
67 | ||
68 | /* On PCs, the checksum is built only over bytes 2..31 */ | |
69 | #define PC_CKS_RANGE_START 2 | |
70 | #define PC_CKS_RANGE_END 31 | |
71 | #define PC_CKS_LOC 32 | |
72 | #define NVRAM_BYTES (128-NVRAM_FIRST_BYTE) | |
73 | ||
74 | #define mach_check_checksum pc_check_checksum | |
75 | #define mach_set_checksum pc_set_checksum | |
76 | #define mach_proc_infos pc_proc_infos | |
77 | ||
78 | #endif | |
79 | ||
80 | #if MACH == COBALT | |
81 | ||
82 | #define CHECK_DRIVER_INIT() 1 | |
83 | ||
84 | #define NVRAM_BYTES (128-NVRAM_FIRST_BYTE) | |
85 | ||
86 | #define mach_check_checksum cobalt_check_checksum | |
87 | #define mach_set_checksum cobalt_set_checksum | |
88 | #define mach_proc_infos cobalt_proc_infos | |
89 | ||
90 | #endif | |
91 | ||
92 | #if MACH == ATARI | |
93 | ||
94 | /* Special parameters for RTC in Atari machines */ | |
95 | #include <asm/atarihw.h> | |
96 | #include <asm/atariints.h> | |
97 | #define RTC_PORT(x) (TT_RTC_BAS + 2*(x)) | |
98 | #define CHECK_DRIVER_INIT() (MACH_IS_ATARI && ATARIHW_PRESENT(TT_CLK)) | |
99 | ||
100 | #define NVRAM_BYTES 50 | |
101 | ||
102 | /* On Ataris, the checksum is over all bytes except the checksum bytes | |
103 | * themselves; these are at the very end */ | |
104 | #define ATARI_CKS_RANGE_START 0 | |
105 | #define ATARI_CKS_RANGE_END 47 | |
106 | #define ATARI_CKS_LOC 48 | |
107 | ||
108 | #define mach_check_checksum atari_check_checksum | |
109 | #define mach_set_checksum atari_set_checksum | |
110 | #define mach_proc_infos atari_proc_infos | |
111 | ||
112 | #endif | |
113 | ||
114 | /* Note that *all* calls to CMOS_READ and CMOS_WRITE must be done with | |
115 | * rtc_lock held. Due to the index-port/data-port design of the RTC, we | |
116 | * don't want two different things trying to get to it at once. (e.g. the | |
117 | * periodic 11 min sync from time.c vs. this driver.) | |
118 | */ | |
119 | ||
120 | #include <linux/types.h> | |
121 | #include <linux/errno.h> | |
122 | #include <linux/miscdevice.h> | |
123 | #include <linux/slab.h> | |
124 | #include <linux/ioport.h> | |
125 | #include <linux/fcntl.h> | |
126 | #include <linux/mc146818rtc.h> | |
127 | #include <linux/init.h> | |
128 | #include <linux/proc_fs.h> | |
129 | #include <linux/spinlock.h> | |
130 | ||
131 | #include <asm/io.h> | |
132 | #include <asm/uaccess.h> | |
133 | #include <asm/system.h> | |
134 | ||
135 | static DEFINE_SPINLOCK(nvram_state_lock); | |
136 | static int nvram_open_cnt; /* #times opened */ | |
137 | static int nvram_open_mode; /* special open modes */ | |
138 | #define NVRAM_WRITE 1 /* opened for writing (exclusive) */ | |
139 | #define NVRAM_EXCL 2 /* opened with O_EXCL */ | |
140 | ||
141 | static int mach_check_checksum(void); | |
142 | static void mach_set_checksum(void); | |
143 | ||
144 | #ifdef CONFIG_PROC_FS | |
145 | static int mach_proc_infos(unsigned char *contents, char *buffer, int *len, | |
146 | off_t *begin, off_t offset, int size); | |
147 | #endif | |
148 | ||
149 | /* | |
150 | * These functions are provided to be called internally or by other parts of | |
151 | * the kernel. It's up to the caller to ensure correct checksum before reading | |
152 | * or after writing (needs to be done only once). | |
153 | * | |
154 | * It is worth noting that these functions all access bytes of general | |
155 | * purpose memory in the NVRAM - that is to say, they all add the | |
156 | * NVRAM_FIRST_BYTE offset. Pass them offsets into NVRAM as if you did not | |
157 | * know about the RTC cruft. | |
158 | */ | |
159 | ||
160 | unsigned char | |
161 | __nvram_read_byte(int i) | |
162 | { | |
163 | return CMOS_READ(NVRAM_FIRST_BYTE + i); | |
164 | } | |
165 | ||
166 | unsigned char | |
167 | nvram_read_byte(int i) | |
168 | { | |
169 | unsigned long flags; | |
170 | unsigned char c; | |
171 | ||
172 | spin_lock_irqsave(&rtc_lock, flags); | |
173 | c = __nvram_read_byte(i); | |
174 | spin_unlock_irqrestore(&rtc_lock, flags); | |
175 | return c; | |
176 | } | |
177 | ||
178 | /* This races nicely with trying to read with checksum checking (nvram_read) */ | |
179 | void | |
180 | __nvram_write_byte(unsigned char c, int i) | |
181 | { | |
182 | CMOS_WRITE(c, NVRAM_FIRST_BYTE + i); | |
183 | } | |
184 | ||
185 | void | |
186 | nvram_write_byte(unsigned char c, int i) | |
187 | { | |
188 | unsigned long flags; | |
189 | ||
190 | spin_lock_irqsave(&rtc_lock, flags); | |
191 | __nvram_write_byte(c, i); | |
192 | spin_unlock_irqrestore(&rtc_lock, flags); | |
193 | } | |
194 | ||
195 | int | |
196 | __nvram_check_checksum(void) | |
197 | { | |
198 | return mach_check_checksum(); | |
199 | } | |
200 | ||
201 | int | |
202 | nvram_check_checksum(void) | |
203 | { | |
204 | unsigned long flags; | |
205 | int rv; | |
206 | ||
207 | spin_lock_irqsave(&rtc_lock, flags); | |
208 | rv = __nvram_check_checksum(); | |
209 | spin_unlock_irqrestore(&rtc_lock, flags); | |
210 | return rv; | |
211 | } | |
212 | ||
681ea4b9 | 213 | static void |
1da177e4 LT |
214 | __nvram_set_checksum(void) |
215 | { | |
216 | mach_set_checksum(); | |
217 | } | |
218 | ||
681ea4b9 | 219 | #if 0 |
1da177e4 LT |
220 | void |
221 | nvram_set_checksum(void) | |
222 | { | |
223 | unsigned long flags; | |
224 | ||
225 | spin_lock_irqsave(&rtc_lock, flags); | |
226 | __nvram_set_checksum(); | |
227 | spin_unlock_irqrestore(&rtc_lock, flags); | |
228 | } | |
681ea4b9 | 229 | #endif /* 0 */ |
1da177e4 LT |
230 | |
231 | /* | |
232 | * The are the file operation function for user access to /dev/nvram | |
233 | */ | |
234 | ||
235 | static loff_t nvram_llseek(struct file *file,loff_t offset, int origin ) | |
236 | { | |
237 | lock_kernel(); | |
238 | switch (origin) { | |
239 | case 0: | |
240 | /* nothing to do */ | |
241 | break; | |
242 | case 1: | |
243 | offset += file->f_pos; | |
244 | break; | |
245 | case 2: | |
246 | offset += NVRAM_BYTES; | |
247 | break; | |
248 | } | |
249 | unlock_kernel(); | |
250 | return (offset >= 0) ? (file->f_pos = offset) : -EINVAL; | |
251 | } | |
252 | ||
253 | static ssize_t | |
254 | nvram_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) | |
255 | { | |
256 | unsigned char contents[NVRAM_BYTES]; | |
257 | unsigned i = *ppos; | |
258 | unsigned char *tmp; | |
259 | ||
260 | spin_lock_irq(&rtc_lock); | |
261 | ||
262 | if (!__nvram_check_checksum()) | |
263 | goto checksum_err; | |
264 | ||
265 | for (tmp = contents; count-- > 0 && i < NVRAM_BYTES; ++i, ++tmp) | |
266 | *tmp = __nvram_read_byte(i); | |
267 | ||
268 | spin_unlock_irq(&rtc_lock); | |
269 | ||
270 | if (copy_to_user(buf, contents, tmp - contents)) | |
271 | return -EFAULT; | |
272 | ||
273 | *ppos = i; | |
274 | ||
275 | return tmp - contents; | |
276 | ||
277 | checksum_err: | |
278 | spin_unlock_irq(&rtc_lock); | |
279 | return -EIO; | |
280 | } | |
281 | ||
282 | static ssize_t | |
283 | nvram_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) | |
284 | { | |
285 | unsigned char contents[NVRAM_BYTES]; | |
286 | unsigned i = *ppos; | |
287 | unsigned char *tmp; | |
288 | int len; | |
289 | ||
290 | len = (NVRAM_BYTES - i) < count ? (NVRAM_BYTES - i) : count; | |
291 | if (copy_from_user(contents, buf, len)) | |
292 | return -EFAULT; | |
293 | ||
294 | spin_lock_irq(&rtc_lock); | |
295 | ||
296 | if (!__nvram_check_checksum()) | |
297 | goto checksum_err; | |
298 | ||
299 | for (tmp = contents; count-- > 0 && i < NVRAM_BYTES; ++i, ++tmp) | |
300 | __nvram_write_byte(*tmp, i); | |
301 | ||
302 | __nvram_set_checksum(); | |
303 | ||
304 | spin_unlock_irq(&rtc_lock); | |
305 | ||
306 | *ppos = i; | |
307 | ||
308 | return tmp - contents; | |
309 | ||
310 | checksum_err: | |
311 | spin_unlock_irq(&rtc_lock); | |
312 | return -EIO; | |
313 | } | |
314 | ||
315 | static int | |
316 | nvram_ioctl(struct inode *inode, struct file *file, | |
317 | unsigned int cmd, unsigned long arg) | |
318 | { | |
319 | int i; | |
320 | ||
321 | switch (cmd) { | |
322 | ||
323 | case NVRAM_INIT: | |
324 | /* initialize NVRAM contents and checksum */ | |
325 | if (!capable(CAP_SYS_ADMIN)) | |
326 | return -EACCES; | |
327 | ||
328 | spin_lock_irq(&rtc_lock); | |
329 | ||
330 | for (i = 0; i < NVRAM_BYTES; ++i) | |
331 | __nvram_write_byte(0, i); | |
332 | __nvram_set_checksum(); | |
333 | ||
334 | spin_unlock_irq(&rtc_lock); | |
335 | return 0; | |
336 | ||
337 | case NVRAM_SETCKS: | |
338 | /* just set checksum, contents unchanged (maybe useful after | |
339 | * checksum garbaged somehow...) */ | |
340 | if (!capable(CAP_SYS_ADMIN)) | |
341 | return -EACCES; | |
342 | ||
343 | spin_lock_irq(&rtc_lock); | |
344 | __nvram_set_checksum(); | |
345 | spin_unlock_irq(&rtc_lock); | |
346 | return 0; | |
347 | ||
348 | default: | |
349 | return -ENOTTY; | |
350 | } | |
351 | } | |
352 | ||
353 | static int | |
354 | nvram_open(struct inode *inode, struct file *file) | |
355 | { | |
356 | spin_lock(&nvram_state_lock); | |
357 | ||
358 | if ((nvram_open_cnt && (file->f_flags & O_EXCL)) || | |
359 | (nvram_open_mode & NVRAM_EXCL) || | |
360 | ((file->f_mode & 2) && (nvram_open_mode & NVRAM_WRITE))) { | |
361 | spin_unlock(&nvram_state_lock); | |
362 | return -EBUSY; | |
363 | } | |
364 | ||
365 | if (file->f_flags & O_EXCL) | |
366 | nvram_open_mode |= NVRAM_EXCL; | |
367 | if (file->f_mode & 2) | |
368 | nvram_open_mode |= NVRAM_WRITE; | |
369 | nvram_open_cnt++; | |
370 | ||
371 | spin_unlock(&nvram_state_lock); | |
372 | ||
373 | return 0; | |
374 | } | |
375 | ||
376 | static int | |
377 | nvram_release(struct inode *inode, struct file *file) | |
378 | { | |
379 | spin_lock(&nvram_state_lock); | |
380 | ||
381 | nvram_open_cnt--; | |
382 | ||
383 | /* if only one instance is open, clear the EXCL bit */ | |
384 | if (nvram_open_mode & NVRAM_EXCL) | |
385 | nvram_open_mode &= ~NVRAM_EXCL; | |
386 | if (file->f_mode & 2) | |
387 | nvram_open_mode &= ~NVRAM_WRITE; | |
388 | ||
389 | spin_unlock(&nvram_state_lock); | |
390 | ||
391 | return 0; | |
392 | } | |
393 | ||
394 | #ifndef CONFIG_PROC_FS | |
395 | static int | |
396 | nvram_read_proc(char *buffer, char **start, off_t offset, | |
397 | int size, int *eof, void *data) | |
398 | { | |
399 | return 0; | |
400 | } | |
401 | #else | |
402 | ||
403 | static int | |
404 | nvram_read_proc(char *buffer, char **start, off_t offset, | |
405 | int size, int *eof, void *data) | |
406 | { | |
407 | unsigned char contents[NVRAM_BYTES]; | |
408 | int i, len = 0; | |
409 | off_t begin = 0; | |
410 | ||
411 | spin_lock_irq(&rtc_lock); | |
412 | for (i = 0; i < NVRAM_BYTES; ++i) | |
413 | contents[i] = __nvram_read_byte(i); | |
414 | spin_unlock_irq(&rtc_lock); | |
415 | ||
416 | *eof = mach_proc_infos(contents, buffer, &len, &begin, offset, size); | |
417 | ||
418 | if (offset >= begin + len) | |
419 | return 0; | |
420 | *start = buffer + (offset - begin); | |
421 | return (size < begin + len - offset) ? size : begin + len - offset; | |
422 | ||
423 | } | |
424 | ||
425 | /* This macro frees the machine specific function from bounds checking and | |
426 | * this like that... */ | |
427 | #define PRINT_PROC(fmt,args...) \ | |
428 | do { \ | |
429 | *len += sprintf(buffer+*len, fmt, ##args); \ | |
430 | if (*begin + *len > offset + size) \ | |
431 | return 0; \ | |
432 | if (*begin + *len < offset) { \ | |
433 | *begin += *len; \ | |
434 | *len = 0; \ | |
435 | } \ | |
436 | } while(0) | |
437 | ||
438 | #endif /* CONFIG_PROC_FS */ | |
439 | ||
62322d25 | 440 | static const struct file_operations nvram_fops = { |
1da177e4 LT |
441 | .owner = THIS_MODULE, |
442 | .llseek = nvram_llseek, | |
443 | .read = nvram_read, | |
444 | .write = nvram_write, | |
445 | .ioctl = nvram_ioctl, | |
446 | .open = nvram_open, | |
447 | .release = nvram_release, | |
448 | }; | |
449 | ||
450 | static struct miscdevice nvram_dev = { | |
451 | NVRAM_MINOR, | |
452 | "nvram", | |
453 | &nvram_fops | |
454 | }; | |
455 | ||
456 | static int __init | |
457 | nvram_init(void) | |
458 | { | |
459 | int ret; | |
460 | ||
461 | /* First test whether the driver should init at all */ | |
462 | if (!CHECK_DRIVER_INIT()) | |
463 | return -ENXIO; | |
464 | ||
465 | ret = misc_register(&nvram_dev); | |
466 | if (ret) { | |
467 | printk(KERN_ERR "nvram: can't misc_register on minor=%d\n", | |
468 | NVRAM_MINOR); | |
469 | goto out; | |
470 | } | |
471 | if (!create_proc_read_entry("driver/nvram", 0, NULL, nvram_read_proc, | |
472 | NULL)) { | |
473 | printk(KERN_ERR "nvram: can't create /proc/driver/nvram\n"); | |
474 | ret = -ENOMEM; | |
475 | goto outmisc; | |
476 | } | |
477 | ret = 0; | |
478 | printk(KERN_INFO "Non-volatile memory driver v" NVRAM_VERSION "\n"); | |
479 | out: | |
480 | return ret; | |
481 | outmisc: | |
482 | misc_deregister(&nvram_dev); | |
483 | goto out; | |
484 | } | |
485 | ||
486 | static void __exit | |
487 | nvram_cleanup_module(void) | |
488 | { | |
489 | remove_proc_entry("driver/nvram", NULL); | |
490 | misc_deregister(&nvram_dev); | |
491 | } | |
492 | ||
493 | module_init(nvram_init); | |
494 | module_exit(nvram_cleanup_module); | |
495 | ||
496 | /* | |
497 | * Machine specific functions | |
498 | */ | |
499 | ||
500 | #if MACH == PC | |
501 | ||
502 | static int | |
503 | pc_check_checksum(void) | |
504 | { | |
505 | int i; | |
506 | unsigned short sum = 0; | |
507 | unsigned short expect; | |
508 | ||
509 | for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i) | |
510 | sum += __nvram_read_byte(i); | |
511 | expect = __nvram_read_byte(PC_CKS_LOC)<<8 | | |
512 | __nvram_read_byte(PC_CKS_LOC+1); | |
513 | return ((sum & 0xffff) == expect); | |
514 | } | |
515 | ||
516 | static void | |
517 | pc_set_checksum(void) | |
518 | { | |
519 | int i; | |
520 | unsigned short sum = 0; | |
521 | ||
522 | for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i) | |
523 | sum += __nvram_read_byte(i); | |
524 | __nvram_write_byte(sum >> 8, PC_CKS_LOC); | |
525 | __nvram_write_byte(sum & 0xff, PC_CKS_LOC + 1); | |
526 | } | |
527 | ||
528 | #ifdef CONFIG_PROC_FS | |
529 | ||
530 | static char *floppy_types[] = { | |
531 | "none", "5.25'' 360k", "5.25'' 1.2M", "3.5'' 720k", "3.5'' 1.44M", | |
532 | "3.5'' 2.88M", "3.5'' 2.88M" | |
533 | }; | |
534 | ||
535 | static char *gfx_types[] = { | |
536 | "EGA, VGA, ... (with BIOS)", | |
537 | "CGA (40 cols)", | |
538 | "CGA (80 cols)", | |
539 | "monochrome", | |
540 | }; | |
541 | ||
542 | static int | |
543 | pc_proc_infos(unsigned char *nvram, char *buffer, int *len, | |
544 | off_t *begin, off_t offset, int size) | |
545 | { | |
546 | int checksum; | |
547 | int type; | |
548 | ||
549 | spin_lock_irq(&rtc_lock); | |
550 | checksum = __nvram_check_checksum(); | |
551 | spin_unlock_irq(&rtc_lock); | |
552 | ||
553 | PRINT_PROC("Checksum status: %svalid\n", checksum ? "" : "not "); | |
554 | ||
555 | PRINT_PROC("# floppies : %d\n", | |
556 | (nvram[6] & 1) ? (nvram[6] >> 6) + 1 : 0); | |
557 | PRINT_PROC("Floppy 0 type : "); | |
558 | type = nvram[2] >> 4; | |
fe971071 | 559 | if (type < ARRAY_SIZE(floppy_types)) |
1da177e4 LT |
560 | PRINT_PROC("%s\n", floppy_types[type]); |
561 | else | |
562 | PRINT_PROC("%d (unknown)\n", type); | |
563 | PRINT_PROC("Floppy 1 type : "); | |
564 | type = nvram[2] & 0x0f; | |
fe971071 | 565 | if (type < ARRAY_SIZE(floppy_types)) |
1da177e4 LT |
566 | PRINT_PROC("%s\n", floppy_types[type]); |
567 | else | |
568 | PRINT_PROC("%d (unknown)\n", type); | |
569 | ||
570 | PRINT_PROC("HD 0 type : "); | |
571 | type = nvram[4] >> 4; | |
572 | if (type) | |
573 | PRINT_PROC("%02x\n", type == 0x0f ? nvram[11] : type); | |
574 | else | |
575 | PRINT_PROC("none\n"); | |
576 | ||
577 | PRINT_PROC("HD 1 type : "); | |
578 | type = nvram[4] & 0x0f; | |
579 | if (type) | |
580 | PRINT_PROC("%02x\n", type == 0x0f ? nvram[12] : type); | |
581 | else | |
582 | PRINT_PROC("none\n"); | |
583 | ||
584 | PRINT_PROC("HD type 48 data: %d/%d/%d C/H/S, precomp %d, lz %d\n", | |
585 | nvram[18] | (nvram[19] << 8), | |
586 | nvram[20], nvram[25], | |
587 | nvram[21] | (nvram[22] << 8), nvram[23] | (nvram[24] << 8)); | |
588 | PRINT_PROC("HD type 49 data: %d/%d/%d C/H/S, precomp %d, lz %d\n", | |
589 | nvram[39] | (nvram[40] << 8), | |
590 | nvram[41], nvram[46], | |
591 | nvram[42] | (nvram[43] << 8), nvram[44] | (nvram[45] << 8)); | |
592 | ||
593 | PRINT_PROC("DOS base memory: %d kB\n", nvram[7] | (nvram[8] << 8)); | |
594 | PRINT_PROC("Extended memory: %d kB (configured), %d kB (tested)\n", | |
595 | nvram[9] | (nvram[10] << 8), nvram[34] | (nvram[35] << 8)); | |
596 | ||
597 | PRINT_PROC("Gfx adapter : %s\n", gfx_types[(nvram[6] >> 4) & 3]); | |
598 | ||
599 | PRINT_PROC("FPU : %sinstalled\n", | |
600 | (nvram[6] & 2) ? "" : "not "); | |
601 | ||
602 | return 1; | |
603 | } | |
604 | #endif | |
605 | ||
606 | #endif /* MACH == PC */ | |
607 | ||
608 | #if MACH == COBALT | |
609 | ||
610 | /* the cobalt CMOS has a wider range of its checksum */ | |
611 | static int cobalt_check_checksum(void) | |
612 | { | |
613 | int i; | |
614 | unsigned short sum = 0; | |
615 | unsigned short expect; | |
616 | ||
617 | for (i = COBT_CMOS_CKS_START; i <= COBT_CMOS_CKS_END; ++i) { | |
618 | if ((i == COBT_CMOS_CHECKSUM) || (i == (COBT_CMOS_CHECKSUM+1))) | |
619 | continue; | |
620 | ||
621 | sum += __nvram_read_byte(i); | |
622 | } | |
623 | expect = __nvram_read_byte(COBT_CMOS_CHECKSUM) << 8 | | |
624 | __nvram_read_byte(COBT_CMOS_CHECKSUM+1); | |
625 | return ((sum & 0xffff) == expect); | |
626 | } | |
627 | ||
628 | static void cobalt_set_checksum(void) | |
629 | { | |
630 | int i; | |
631 | unsigned short sum = 0; | |
632 | ||
633 | for (i = COBT_CMOS_CKS_START; i <= COBT_CMOS_CKS_END; ++i) { | |
634 | if ((i == COBT_CMOS_CHECKSUM) || (i == (COBT_CMOS_CHECKSUM+1))) | |
635 | continue; | |
636 | ||
637 | sum += __nvram_read_byte(i); | |
638 | } | |
639 | ||
640 | __nvram_write_byte(sum >> 8, COBT_CMOS_CHECKSUM); | |
641 | __nvram_write_byte(sum & 0xff, COBT_CMOS_CHECKSUM+1); | |
642 | } | |
643 | ||
644 | #ifdef CONFIG_PROC_FS | |
645 | ||
646 | static int cobalt_proc_infos(unsigned char *nvram, char *buffer, int *len, | |
647 | off_t *begin, off_t offset, int size) | |
648 | { | |
649 | int i; | |
650 | unsigned int checksum; | |
651 | unsigned int flags; | |
652 | char sernum[14]; | |
653 | char *key = "cNoEbTaWlOtR!"; | |
654 | unsigned char bto_csum; | |
655 | ||
656 | spin_lock_irq(&rtc_lock); | |
657 | checksum = __nvram_check_checksum(); | |
658 | spin_unlock_irq(&rtc_lock); | |
659 | ||
660 | PRINT_PROC("Checksum status: %svalid\n", checksum ? "" : "not "); | |
661 | ||
662 | flags = nvram[COBT_CMOS_FLAG_BYTE_0] << 8 | |
663 | | nvram[COBT_CMOS_FLAG_BYTE_1]; | |
664 | ||
665 | PRINT_PROC("Console: %s\n", | |
666 | flags & COBT_CMOS_CONSOLE_FLAG ? "on": "off"); | |
667 | ||
668 | PRINT_PROC("Firmware Debug Messages: %s\n", | |
669 | flags & COBT_CMOS_DEBUG_FLAG ? "on": "off"); | |
670 | ||
671 | PRINT_PROC("Auto Prompt: %s\n", | |
672 | flags & COBT_CMOS_AUTO_PROMPT_FLAG ? "on": "off"); | |
673 | ||
674 | PRINT_PROC("Shutdown Status: %s\n", | |
675 | flags & COBT_CMOS_CLEAN_BOOT_FLAG ? "clean": "dirty"); | |
676 | ||
677 | PRINT_PROC("Hardware Probe: %s\n", | |
678 | flags & COBT_CMOS_HW_NOPROBE_FLAG ? "partial": "full"); | |
679 | ||
680 | PRINT_PROC("System Fault: %sdetected\n", | |
681 | flags & COBT_CMOS_SYSFAULT_FLAG ? "": "not "); | |
682 | ||
683 | PRINT_PROC("Panic on OOPS: %s\n", | |
684 | flags & COBT_CMOS_OOPSPANIC_FLAG ? "yes": "no"); | |
685 | ||
686 | PRINT_PROC("Delayed Cache Initialization: %s\n", | |
687 | flags & COBT_CMOS_DELAY_CACHE_FLAG ? "yes": "no"); | |
688 | ||
689 | PRINT_PROC("Show Logo at Boot: %s\n", | |
690 | flags & COBT_CMOS_NOLOGO_FLAG ? "no": "yes"); | |
691 | ||
692 | PRINT_PROC("Boot Method: "); | |
693 | switch (nvram[COBT_CMOS_BOOT_METHOD]) { | |
694 | case COBT_CMOS_BOOT_METHOD_DISK: | |
695 | PRINT_PROC("disk\n"); | |
696 | break; | |
697 | ||
698 | case COBT_CMOS_BOOT_METHOD_ROM: | |
699 | PRINT_PROC("rom\n"); | |
700 | break; | |
701 | ||
702 | case COBT_CMOS_BOOT_METHOD_NET: | |
703 | PRINT_PROC("net\n"); | |
704 | break; | |
705 | ||
706 | default: | |
707 | PRINT_PROC("unknown\n"); | |
708 | break; | |
709 | } | |
710 | ||
711 | PRINT_PROC("Primary Boot Device: %d:%d\n", | |
712 | nvram[COBT_CMOS_BOOT_DEV0_MAJ], | |
713 | nvram[COBT_CMOS_BOOT_DEV0_MIN] ); | |
714 | PRINT_PROC("Secondary Boot Device: %d:%d\n", | |
715 | nvram[COBT_CMOS_BOOT_DEV1_MAJ], | |
716 | nvram[COBT_CMOS_BOOT_DEV1_MIN] ); | |
717 | PRINT_PROC("Tertiary Boot Device: %d:%d\n", | |
718 | nvram[COBT_CMOS_BOOT_DEV2_MAJ], | |
719 | nvram[COBT_CMOS_BOOT_DEV2_MIN] ); | |
720 | ||
721 | PRINT_PROC("Uptime: %d\n", | |
722 | nvram[COBT_CMOS_UPTIME_0] << 24 | | |
723 | nvram[COBT_CMOS_UPTIME_1] << 16 | | |
724 | nvram[COBT_CMOS_UPTIME_2] << 8 | | |
725 | nvram[COBT_CMOS_UPTIME_3]); | |
726 | ||
727 | PRINT_PROC("Boot Count: %d\n", | |
728 | nvram[COBT_CMOS_BOOTCOUNT_0] << 24 | | |
729 | nvram[COBT_CMOS_BOOTCOUNT_1] << 16 | | |
730 | nvram[COBT_CMOS_BOOTCOUNT_2] << 8 | | |
731 | nvram[COBT_CMOS_BOOTCOUNT_3]); | |
732 | ||
733 | /* 13 bytes of serial num */ | |
734 | for (i=0 ; i<13 ; i++) { | |
735 | sernum[i] = nvram[COBT_CMOS_SYS_SERNUM_0 + i]; | |
736 | } | |
737 | sernum[13] = '\0'; | |
738 | ||
739 | checksum = 0; | |
740 | for (i=0 ; i<13 ; i++) { | |
741 | checksum += sernum[i] ^ key[i]; | |
742 | } | |
743 | checksum = ((checksum & 0x7f) ^ (0xd6)) & 0xff; | |
744 | ||
745 | PRINT_PROC("Serial Number: %s", sernum); | |
746 | if (checksum != nvram[COBT_CMOS_SYS_SERNUM_CSUM]) { | |
747 | PRINT_PROC(" (invalid checksum)"); | |
748 | } | |
749 | PRINT_PROC("\n"); | |
750 | ||
751 | PRINT_PROC("Rom Revison: %d.%d.%d\n", nvram[COBT_CMOS_ROM_REV_MAJ], | |
752 | nvram[COBT_CMOS_ROM_REV_MIN], nvram[COBT_CMOS_ROM_REV_REV]); | |
753 | ||
754 | PRINT_PROC("BTO Server: %d.%d.%d.%d", nvram[COBT_CMOS_BTO_IP_0], | |
755 | nvram[COBT_CMOS_BTO_IP_1], nvram[COBT_CMOS_BTO_IP_2], | |
756 | nvram[COBT_CMOS_BTO_IP_3]); | |
757 | bto_csum = nvram[COBT_CMOS_BTO_IP_0] + nvram[COBT_CMOS_BTO_IP_1] | |
758 | + nvram[COBT_CMOS_BTO_IP_2] + nvram[COBT_CMOS_BTO_IP_3]; | |
759 | if (bto_csum != nvram[COBT_CMOS_BTO_IP_CSUM]) { | |
760 | PRINT_PROC(" (invalid checksum)"); | |
761 | } | |
762 | PRINT_PROC("\n"); | |
763 | ||
764 | if (flags & COBT_CMOS_VERSION_FLAG | |
765 | && nvram[COBT_CMOS_VERSION] >= COBT_CMOS_VER_BTOCODE) { | |
766 | PRINT_PROC("BTO Code: 0x%x\n", | |
767 | nvram[COBT_CMOS_BTO_CODE_0] << 24 | | |
768 | nvram[COBT_CMOS_BTO_CODE_1] << 16 | | |
769 | nvram[COBT_CMOS_BTO_CODE_2] << 8 | | |
770 | nvram[COBT_CMOS_BTO_CODE_3]); | |
771 | } | |
772 | ||
773 | return 1; | |
774 | } | |
775 | #endif /* CONFIG_PROC_FS */ | |
776 | ||
777 | #endif /* MACH == COBALT */ | |
778 | ||
779 | #if MACH == ATARI | |
780 | ||
781 | static int | |
782 | atari_check_checksum(void) | |
783 | { | |
784 | int i; | |
785 | unsigned char sum = 0; | |
786 | ||
787 | for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i) | |
788 | sum += __nvram_read_byte(i); | |
789 | return (__nvram_read_byte(ATARI_CKS_LOC) == (~sum & 0xff) && | |
790 | __nvram_read_byte(ATARI_CKS_LOC + 1) == (sum & 0xff)); | |
791 | } | |
792 | ||
793 | static void | |
794 | atari_set_checksum(void) | |
795 | { | |
796 | int i; | |
797 | unsigned char sum = 0; | |
798 | ||
799 | for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i) | |
800 | sum += __nvram_read_byte(i); | |
801 | __nvram_write_byte(~sum, ATARI_CKS_LOC); | |
802 | __nvram_write_byte(sum, ATARI_CKS_LOC + 1); | |
803 | } | |
804 | ||
805 | #ifdef CONFIG_PROC_FS | |
806 | ||
807 | static struct { | |
808 | unsigned char val; | |
809 | char *name; | |
810 | } boot_prefs[] = { | |
811 | { 0x80, "TOS" }, | |
812 | { 0x40, "ASV" }, | |
813 | { 0x20, "NetBSD (?)" }, | |
814 | { 0x10, "Linux" }, | |
815 | { 0x00, "unspecified" } | |
816 | }; | |
817 | ||
818 | static char *languages[] = { | |
819 | "English (US)", | |
820 | "German", | |
821 | "French", | |
822 | "English (UK)", | |
823 | "Spanish", | |
824 | "Italian", | |
825 | "6 (undefined)", | |
826 | "Swiss (French)", | |
827 | "Swiss (German)" | |
828 | }; | |
829 | ||
830 | static char *dateformat[] = { | |
831 | "MM%cDD%cYY", | |
832 | "DD%cMM%cYY", | |
833 | "YY%cMM%cDD", | |
834 | "YY%cDD%cMM", | |
835 | "4 (undefined)", | |
836 | "5 (undefined)", | |
837 | "6 (undefined)", | |
838 | "7 (undefined)" | |
839 | }; | |
840 | ||
841 | static char *colors[] = { | |
842 | "2", "4", "16", "256", "65536", "??", "??", "??" | |
843 | }; | |
844 | ||
1da177e4 LT |
845 | static int |
846 | atari_proc_infos(unsigned char *nvram, char *buffer, int *len, | |
847 | off_t *begin, off_t offset, int size) | |
848 | { | |
849 | int checksum = nvram_check_checksum(); | |
850 | int i; | |
851 | unsigned vmode; | |
852 | ||
853 | PRINT_PROC("Checksum status : %svalid\n", checksum ? "" : "not "); | |
854 | ||
855 | PRINT_PROC("Boot preference : "); | |
fe971071 | 856 | for (i = ARRAY_SIZE(boot_prefs) - 1; i >= 0; --i) { |
1da177e4 LT |
857 | if (nvram[1] == boot_prefs[i].val) { |
858 | PRINT_PROC("%s\n", boot_prefs[i].name); | |
859 | break; | |
860 | } | |
861 | } | |
862 | if (i < 0) | |
863 | PRINT_PROC("0x%02x (undefined)\n", nvram[1]); | |
864 | ||
865 | PRINT_PROC("SCSI arbitration : %s\n", | |
866 | (nvram[16] & 0x80) ? "on" : "off"); | |
867 | PRINT_PROC("SCSI host ID : "); | |
868 | if (nvram[16] & 0x80) | |
869 | PRINT_PROC("%d\n", nvram[16] & 7); | |
870 | else | |
871 | PRINT_PROC("n/a\n"); | |
872 | ||
873 | /* the following entries are defined only for the Falcon */ | |
874 | if ((atari_mch_cookie >> 16) != ATARI_MCH_FALCON) | |
875 | return 1; | |
876 | ||
877 | PRINT_PROC("OS language : "); | |
fe971071 | 878 | if (nvram[6] < ARRAY_SIZE(languages)) |
1da177e4 LT |
879 | PRINT_PROC("%s\n", languages[nvram[6]]); |
880 | else | |
881 | PRINT_PROC("%u (undefined)\n", nvram[6]); | |
882 | PRINT_PROC("Keyboard language: "); | |
fe971071 | 883 | if (nvram[7] < ARRAY_SIZE(languages)) |
1da177e4 LT |
884 | PRINT_PROC("%s\n", languages[nvram[7]]); |
885 | else | |
886 | PRINT_PROC("%u (undefined)\n", nvram[7]); | |
887 | PRINT_PROC("Date format : "); | |
888 | PRINT_PROC(dateformat[nvram[8] & 7], | |
889 | nvram[9] ? nvram[9] : '/', nvram[9] ? nvram[9] : '/'); | |
890 | PRINT_PROC(", %dh clock\n", nvram[8] & 16 ? 24 : 12); | |
891 | PRINT_PROC("Boot delay : "); | |
892 | if (nvram[10] == 0) | |
893 | PRINT_PROC("default"); | |
894 | else | |
895 | PRINT_PROC("%ds%s\n", nvram[10], | |
896 | nvram[10] < 8 ? ", no memory test" : ""); | |
897 | ||
898 | vmode = (nvram[14] << 8) || nvram[15]; | |
899 | PRINT_PROC("Video mode : %s colors, %d columns, %s %s monitor\n", | |
900 | colors[vmode & 7], | |
901 | vmode & 8 ? 80 : 40, | |
902 | vmode & 16 ? "VGA" : "TV", vmode & 32 ? "PAL" : "NTSC"); | |
903 | PRINT_PROC(" %soverscan, compat. mode %s%s\n", | |
904 | vmode & 64 ? "" : "no ", | |
905 | vmode & 128 ? "on" : "off", | |
906 | vmode & 256 ? | |
907 | (vmode & 16 ? ", line doubling" : ", half screen") : ""); | |
908 | ||
909 | return 1; | |
910 | } | |
911 | #endif | |
912 | ||
913 | #endif /* MACH == ATARI */ | |
914 | ||
915 | MODULE_LICENSE("GPL"); | |
916 | ||
917 | EXPORT_SYMBOL(__nvram_read_byte); | |
918 | EXPORT_SYMBOL(nvram_read_byte); | |
919 | EXPORT_SYMBOL(__nvram_write_byte); | |
920 | EXPORT_SYMBOL(nvram_write_byte); | |
921 | EXPORT_SYMBOL(__nvram_check_checksum); | |
922 | EXPORT_SYMBOL(nvram_check_checksum); | |
1da177e4 | 923 | MODULE_ALIAS_MISCDEV(NVRAM_MINOR); |