blob: 204deaa0de80edb9f16ca0fd55923b13950924e0 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Russell King866237e2005-11-04 17:26:57 +000037#define NVRAM_VERSION "1.2"
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include <linux/smp_lock.h>
41#include <linux/nvram.h>
42
43#define PC 1
44#define ATARI 2
45#define COBALT 3
46
47/* select machine configuration */
48#if defined(CONFIG_ATARI)
49# define MACH ATARI
50#elif defined(__i386__) || defined(__x86_64__) || defined(__arm__) /* and others?? */
51#define MACH PC
52# if defined(CONFIG_COBALT)
53# include <linux/cobalt-nvram.h>
54# define MACH COBALT
55# else
56# define MACH PC
57# endif
58#else
59# error Cannot build nvram driver for this machine configuration.
60#endif
61
62#if MACH == PC
63
64/* RTC in a PC */
65#define CHECK_DRIVER_INIT() 1
66
67/* On PCs, the checksum is built only over bytes 2..31 */
68#define PC_CKS_RANGE_START 2
69#define PC_CKS_RANGE_END 31
70#define PC_CKS_LOC 32
71#define NVRAM_BYTES (128-NVRAM_FIRST_BYTE)
72
73#define mach_check_checksum pc_check_checksum
74#define mach_set_checksum pc_set_checksum
75#define mach_proc_infos pc_proc_infos
76
77#endif
78
79#if MACH == COBALT
80
81#define CHECK_DRIVER_INIT() 1
82
83#define NVRAM_BYTES (128-NVRAM_FIRST_BYTE)
84
85#define mach_check_checksum cobalt_check_checksum
86#define mach_set_checksum cobalt_set_checksum
87#define mach_proc_infos cobalt_proc_infos
88
89#endif
90
91#if MACH == ATARI
92
93/* Special parameters for RTC in Atari machines */
94#include <asm/atarihw.h>
95#include <asm/atariints.h>
96#define RTC_PORT(x) (TT_RTC_BAS + 2*(x))
97#define CHECK_DRIVER_INIT() (MACH_IS_ATARI && ATARIHW_PRESENT(TT_CLK))
98
99#define NVRAM_BYTES 50
100
101/* On Ataris, the checksum is over all bytes except the checksum bytes
102 * themselves; these are at the very end */
103#define ATARI_CKS_RANGE_START 0
104#define ATARI_CKS_RANGE_END 47
105#define ATARI_CKS_LOC 48
106
107#define mach_check_checksum atari_check_checksum
108#define mach_set_checksum atari_set_checksum
109#define mach_proc_infos atari_proc_infos
110
111#endif
112
113/* Note that *all* calls to CMOS_READ and CMOS_WRITE must be done with
114 * rtc_lock held. Due to the index-port/data-port design of the RTC, we
115 * don't want two different things trying to get to it at once. (e.g. the
116 * periodic 11 min sync from time.c vs. this driver.)
117 */
118
119#include <linux/types.h>
120#include <linux/errno.h>
121#include <linux/miscdevice.h>
122#include <linux/slab.h>
123#include <linux/ioport.h>
124#include <linux/fcntl.h>
125#include <linux/mc146818rtc.h>
126#include <linux/init.h>
127#include <linux/proc_fs.h>
128#include <linux/spinlock.h>
129
130#include <asm/io.h>
131#include <asm/uaccess.h>
132#include <asm/system.h>
133
134static DEFINE_SPINLOCK(nvram_state_lock);
135static int nvram_open_cnt; /* #times opened */
136static int nvram_open_mode; /* special open modes */
137#define NVRAM_WRITE 1 /* opened for writing (exclusive) */
138#define NVRAM_EXCL 2 /* opened with O_EXCL */
139
140static int mach_check_checksum(void);
141static void mach_set_checksum(void);
142
143#ifdef CONFIG_PROC_FS
144static int mach_proc_infos(unsigned char *contents, char *buffer, int *len,
145 off_t *begin, off_t offset, int size);
146#endif
147
148/*
149 * These functions are provided to be called internally or by other parts of
150 * the kernel. It's up to the caller to ensure correct checksum before reading
151 * or after writing (needs to be done only once).
152 *
153 * It is worth noting that these functions all access bytes of general
154 * purpose memory in the NVRAM - that is to say, they all add the
155 * NVRAM_FIRST_BYTE offset. Pass them offsets into NVRAM as if you did not
156 * know about the RTC cruft.
157 */
158
159unsigned char
160__nvram_read_byte(int i)
161{
162 return CMOS_READ(NVRAM_FIRST_BYTE + i);
163}
164
165unsigned char
166nvram_read_byte(int i)
167{
168 unsigned long flags;
169 unsigned char c;
170
171 spin_lock_irqsave(&rtc_lock, flags);
172 c = __nvram_read_byte(i);
173 spin_unlock_irqrestore(&rtc_lock, flags);
174 return c;
175}
176
177/* This races nicely with trying to read with checksum checking (nvram_read) */
178void
179__nvram_write_byte(unsigned char c, int i)
180{
181 CMOS_WRITE(c, NVRAM_FIRST_BYTE + i);
182}
183
184void
185nvram_write_byte(unsigned char c, int i)
186{
187 unsigned long flags;
188
189 spin_lock_irqsave(&rtc_lock, flags);
190 __nvram_write_byte(c, i);
191 spin_unlock_irqrestore(&rtc_lock, flags);
192}
193
194int
195__nvram_check_checksum(void)
196{
197 return mach_check_checksum();
198}
199
200int
201nvram_check_checksum(void)
202{
203 unsigned long flags;
204 int rv;
205
206 spin_lock_irqsave(&rtc_lock, flags);
207 rv = __nvram_check_checksum();
208 spin_unlock_irqrestore(&rtc_lock, flags);
209 return rv;
210}
211
Adrian Bunk681ea4b2005-06-25 14:59:04 -0700212static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213__nvram_set_checksum(void)
214{
215 mach_set_checksum();
216}
217
Adrian Bunk681ea4b2005-06-25 14:59:04 -0700218#if 0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219void
220nvram_set_checksum(void)
221{
222 unsigned long flags;
223
224 spin_lock_irqsave(&rtc_lock, flags);
225 __nvram_set_checksum();
226 spin_unlock_irqrestore(&rtc_lock, flags);
227}
Adrian Bunk681ea4b2005-06-25 14:59:04 -0700228#endif /* 0 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229
230/*
231 * The are the file operation function for user access to /dev/nvram
232 */
233
234static loff_t nvram_llseek(struct file *file,loff_t offset, int origin )
235{
236 lock_kernel();
237 switch (origin) {
238 case 0:
239 /* nothing to do */
240 break;
241 case 1:
242 offset += file->f_pos;
243 break;
244 case 2:
245 offset += NVRAM_BYTES;
246 break;
247 }
248 unlock_kernel();
249 return (offset >= 0) ? (file->f_pos = offset) : -EINVAL;
250}
251
252static ssize_t
253nvram_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
254{
255 unsigned char contents[NVRAM_BYTES];
256 unsigned i = *ppos;
257 unsigned char *tmp;
258
259 spin_lock_irq(&rtc_lock);
260
261 if (!__nvram_check_checksum())
262 goto checksum_err;
263
264 for (tmp = contents; count-- > 0 && i < NVRAM_BYTES; ++i, ++tmp)
265 *tmp = __nvram_read_byte(i);
266
267 spin_unlock_irq(&rtc_lock);
268
269 if (copy_to_user(buf, contents, tmp - contents))
270 return -EFAULT;
271
272 *ppos = i;
273
274 return tmp - contents;
275
276 checksum_err:
277 spin_unlock_irq(&rtc_lock);
278 return -EIO;
279}
280
281static ssize_t
282nvram_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
283{
284 unsigned char contents[NVRAM_BYTES];
285 unsigned i = *ppos;
286 unsigned char *tmp;
287 int len;
288
289 len = (NVRAM_BYTES - i) < count ? (NVRAM_BYTES - i) : count;
290 if (copy_from_user(contents, buf, len))
291 return -EFAULT;
292
293 spin_lock_irq(&rtc_lock);
294
295 if (!__nvram_check_checksum())
296 goto checksum_err;
297
298 for (tmp = contents; count-- > 0 && i < NVRAM_BYTES; ++i, ++tmp)
299 __nvram_write_byte(*tmp, i);
300
301 __nvram_set_checksum();
302
303 spin_unlock_irq(&rtc_lock);
304
305 *ppos = i;
306
307 return tmp - contents;
308
309 checksum_err:
310 spin_unlock_irq(&rtc_lock);
311 return -EIO;
312}
313
314static int
315nvram_ioctl(struct inode *inode, struct file *file,
316 unsigned int cmd, unsigned long arg)
317{
318 int i;
319
320 switch (cmd) {
321
322 case NVRAM_INIT:
323 /* initialize NVRAM contents and checksum */
324 if (!capable(CAP_SYS_ADMIN))
325 return -EACCES;
326
327 spin_lock_irq(&rtc_lock);
328
329 for (i = 0; i < NVRAM_BYTES; ++i)
330 __nvram_write_byte(0, i);
331 __nvram_set_checksum();
332
333 spin_unlock_irq(&rtc_lock);
334 return 0;
335
336 case NVRAM_SETCKS:
337 /* just set checksum, contents unchanged (maybe useful after
338 * checksum garbaged somehow...) */
339 if (!capable(CAP_SYS_ADMIN))
340 return -EACCES;
341
342 spin_lock_irq(&rtc_lock);
343 __nvram_set_checksum();
344 spin_unlock_irq(&rtc_lock);
345 return 0;
346
347 default:
348 return -ENOTTY;
349 }
350}
351
352static int
353nvram_open(struct inode *inode, struct file *file)
354{
355 spin_lock(&nvram_state_lock);
356
357 if ((nvram_open_cnt && (file->f_flags & O_EXCL)) ||
358 (nvram_open_mode & NVRAM_EXCL) ||
359 ((file->f_mode & 2) && (nvram_open_mode & NVRAM_WRITE))) {
360 spin_unlock(&nvram_state_lock);
361 return -EBUSY;
362 }
363
364 if (file->f_flags & O_EXCL)
365 nvram_open_mode |= NVRAM_EXCL;
366 if (file->f_mode & 2)
367 nvram_open_mode |= NVRAM_WRITE;
368 nvram_open_cnt++;
369
370 spin_unlock(&nvram_state_lock);
371
372 return 0;
373}
374
375static int
376nvram_release(struct inode *inode, struct file *file)
377{
378 spin_lock(&nvram_state_lock);
379
380 nvram_open_cnt--;
381
382 /* if only one instance is open, clear the EXCL bit */
383 if (nvram_open_mode & NVRAM_EXCL)
384 nvram_open_mode &= ~NVRAM_EXCL;
385 if (file->f_mode & 2)
386 nvram_open_mode &= ~NVRAM_WRITE;
387
388 spin_unlock(&nvram_state_lock);
389
390 return 0;
391}
392
393#ifndef CONFIG_PROC_FS
394static int
395nvram_read_proc(char *buffer, char **start, off_t offset,
396 int size, int *eof, void *data)
397{
398 return 0;
399}
400#else
401
402static int
403nvram_read_proc(char *buffer, char **start, off_t offset,
404 int size, int *eof, void *data)
405{
406 unsigned char contents[NVRAM_BYTES];
407 int i, len = 0;
408 off_t begin = 0;
409
410 spin_lock_irq(&rtc_lock);
411 for (i = 0; i < NVRAM_BYTES; ++i)
412 contents[i] = __nvram_read_byte(i);
413 spin_unlock_irq(&rtc_lock);
414
415 *eof = mach_proc_infos(contents, buffer, &len, &begin, offset, size);
416
417 if (offset >= begin + len)
418 return 0;
419 *start = buffer + (offset - begin);
420 return (size < begin + len - offset) ? size : begin + len - offset;
421
422}
423
424/* This macro frees the machine specific function from bounds checking and
425 * this like that... */
426#define PRINT_PROC(fmt,args...) \
427 do { \
428 *len += sprintf(buffer+*len, fmt, ##args); \
429 if (*begin + *len > offset + size) \
430 return 0; \
431 if (*begin + *len < offset) { \
432 *begin += *len; \
433 *len = 0; \
434 } \
435 } while(0)
436
437#endif /* CONFIG_PROC_FS */
438
Arjan van de Ven62322d22006-07-03 00:24:21 -0700439static const struct file_operations nvram_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 .owner = THIS_MODULE,
441 .llseek = nvram_llseek,
442 .read = nvram_read,
443 .write = nvram_write,
444 .ioctl = nvram_ioctl,
445 .open = nvram_open,
446 .release = nvram_release,
447};
448
449static struct miscdevice nvram_dev = {
450 NVRAM_MINOR,
451 "nvram",
452 &nvram_fops
453};
454
455static int __init
456nvram_init(void)
457{
458 int ret;
459
460 /* First test whether the driver should init at all */
461 if (!CHECK_DRIVER_INIT())
462 return -ENXIO;
463
464 ret = misc_register(&nvram_dev);
465 if (ret) {
466 printk(KERN_ERR "nvram: can't misc_register on minor=%d\n",
467 NVRAM_MINOR);
468 goto out;
469 }
470 if (!create_proc_read_entry("driver/nvram", 0, NULL, nvram_read_proc,
471 NULL)) {
472 printk(KERN_ERR "nvram: can't create /proc/driver/nvram\n");
473 ret = -ENOMEM;
474 goto outmisc;
475 }
476 ret = 0;
477 printk(KERN_INFO "Non-volatile memory driver v" NVRAM_VERSION "\n");
478 out:
479 return ret;
480 outmisc:
481 misc_deregister(&nvram_dev);
482 goto out;
483}
484
485static void __exit
486nvram_cleanup_module(void)
487{
488 remove_proc_entry("driver/nvram", NULL);
489 misc_deregister(&nvram_dev);
490}
491
492module_init(nvram_init);
493module_exit(nvram_cleanup_module);
494
495/*
496 * Machine specific functions
497 */
498
499#if MACH == PC
500
501static int
502pc_check_checksum(void)
503{
504 int i;
505 unsigned short sum = 0;
506 unsigned short expect;
507
508 for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i)
509 sum += __nvram_read_byte(i);
510 expect = __nvram_read_byte(PC_CKS_LOC)<<8 |
511 __nvram_read_byte(PC_CKS_LOC+1);
512 return ((sum & 0xffff) == expect);
513}
514
515static void
516pc_set_checksum(void)
517{
518 int i;
519 unsigned short sum = 0;
520
521 for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i)
522 sum += __nvram_read_byte(i);
523 __nvram_write_byte(sum >> 8, PC_CKS_LOC);
524 __nvram_write_byte(sum & 0xff, PC_CKS_LOC + 1);
525}
526
527#ifdef CONFIG_PROC_FS
528
529static char *floppy_types[] = {
530 "none", "5.25'' 360k", "5.25'' 1.2M", "3.5'' 720k", "3.5'' 1.44M",
531 "3.5'' 2.88M", "3.5'' 2.88M"
532};
533
534static char *gfx_types[] = {
535 "EGA, VGA, ... (with BIOS)",
536 "CGA (40 cols)",
537 "CGA (80 cols)",
538 "monochrome",
539};
540
541static int
542pc_proc_infos(unsigned char *nvram, char *buffer, int *len,
543 off_t *begin, off_t offset, int size)
544{
545 int checksum;
546 int type;
547
548 spin_lock_irq(&rtc_lock);
549 checksum = __nvram_check_checksum();
550 spin_unlock_irq(&rtc_lock);
551
552 PRINT_PROC("Checksum status: %svalid\n", checksum ? "" : "not ");
553
554 PRINT_PROC("# floppies : %d\n",
555 (nvram[6] & 1) ? (nvram[6] >> 6) + 1 : 0);
556 PRINT_PROC("Floppy 0 type : ");
557 type = nvram[2] >> 4;
Tobias Klauserfe971072006-01-09 20:54:02 -0800558 if (type < ARRAY_SIZE(floppy_types))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 PRINT_PROC("%s\n", floppy_types[type]);
560 else
561 PRINT_PROC("%d (unknown)\n", type);
562 PRINT_PROC("Floppy 1 type : ");
563 type = nvram[2] & 0x0f;
Tobias Klauserfe971072006-01-09 20:54:02 -0800564 if (type < ARRAY_SIZE(floppy_types))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 PRINT_PROC("%s\n", floppy_types[type]);
566 else
567 PRINT_PROC("%d (unknown)\n", type);
568
569 PRINT_PROC("HD 0 type : ");
570 type = nvram[4] >> 4;
571 if (type)
572 PRINT_PROC("%02x\n", type == 0x0f ? nvram[11] : type);
573 else
574 PRINT_PROC("none\n");
575
576 PRINT_PROC("HD 1 type : ");
577 type = nvram[4] & 0x0f;
578 if (type)
579 PRINT_PROC("%02x\n", type == 0x0f ? nvram[12] : type);
580 else
581 PRINT_PROC("none\n");
582
583 PRINT_PROC("HD type 48 data: %d/%d/%d C/H/S, precomp %d, lz %d\n",
584 nvram[18] | (nvram[19] << 8),
585 nvram[20], nvram[25],
586 nvram[21] | (nvram[22] << 8), nvram[23] | (nvram[24] << 8));
587 PRINT_PROC("HD type 49 data: %d/%d/%d C/H/S, precomp %d, lz %d\n",
588 nvram[39] | (nvram[40] << 8),
589 nvram[41], nvram[46],
590 nvram[42] | (nvram[43] << 8), nvram[44] | (nvram[45] << 8));
591
592 PRINT_PROC("DOS base memory: %d kB\n", nvram[7] | (nvram[8] << 8));
593 PRINT_PROC("Extended memory: %d kB (configured), %d kB (tested)\n",
594 nvram[9] | (nvram[10] << 8), nvram[34] | (nvram[35] << 8));
595
596 PRINT_PROC("Gfx adapter : %s\n", gfx_types[(nvram[6] >> 4) & 3]);
597
598 PRINT_PROC("FPU : %sinstalled\n",
599 (nvram[6] & 2) ? "" : "not ");
600
601 return 1;
602}
603#endif
604
605#endif /* MACH == PC */
606
607#if MACH == COBALT
608
609/* the cobalt CMOS has a wider range of its checksum */
610static int cobalt_check_checksum(void)
611{
612 int i;
613 unsigned short sum = 0;
614 unsigned short expect;
615
616 for (i = COBT_CMOS_CKS_START; i <= COBT_CMOS_CKS_END; ++i) {
617 if ((i == COBT_CMOS_CHECKSUM) || (i == (COBT_CMOS_CHECKSUM+1)))
618 continue;
619
620 sum += __nvram_read_byte(i);
621 }
622 expect = __nvram_read_byte(COBT_CMOS_CHECKSUM) << 8 |
623 __nvram_read_byte(COBT_CMOS_CHECKSUM+1);
624 return ((sum & 0xffff) == expect);
625}
626
627static void cobalt_set_checksum(void)
628{
629 int i;
630 unsigned short sum = 0;
631
632 for (i = COBT_CMOS_CKS_START; i <= COBT_CMOS_CKS_END; ++i) {
633 if ((i == COBT_CMOS_CHECKSUM) || (i == (COBT_CMOS_CHECKSUM+1)))
634 continue;
635
636 sum += __nvram_read_byte(i);
637 }
638
639 __nvram_write_byte(sum >> 8, COBT_CMOS_CHECKSUM);
640 __nvram_write_byte(sum & 0xff, COBT_CMOS_CHECKSUM+1);
641}
642
643#ifdef CONFIG_PROC_FS
644
645static int cobalt_proc_infos(unsigned char *nvram, char *buffer, int *len,
646 off_t *begin, off_t offset, int size)
647{
648 int i;
649 unsigned int checksum;
650 unsigned int flags;
651 char sernum[14];
652 char *key = "cNoEbTaWlOtR!";
653 unsigned char bto_csum;
654
655 spin_lock_irq(&rtc_lock);
656 checksum = __nvram_check_checksum();
657 spin_unlock_irq(&rtc_lock);
658
659 PRINT_PROC("Checksum status: %svalid\n", checksum ? "" : "not ");
660
661 flags = nvram[COBT_CMOS_FLAG_BYTE_0] << 8
662 | nvram[COBT_CMOS_FLAG_BYTE_1];
663
664 PRINT_PROC("Console: %s\n",
665 flags & COBT_CMOS_CONSOLE_FLAG ? "on": "off");
666
667 PRINT_PROC("Firmware Debug Messages: %s\n",
668 flags & COBT_CMOS_DEBUG_FLAG ? "on": "off");
669
670 PRINT_PROC("Auto Prompt: %s\n",
671 flags & COBT_CMOS_AUTO_PROMPT_FLAG ? "on": "off");
672
673 PRINT_PROC("Shutdown Status: %s\n",
674 flags & COBT_CMOS_CLEAN_BOOT_FLAG ? "clean": "dirty");
675
676 PRINT_PROC("Hardware Probe: %s\n",
677 flags & COBT_CMOS_HW_NOPROBE_FLAG ? "partial": "full");
678
679 PRINT_PROC("System Fault: %sdetected\n",
680 flags & COBT_CMOS_SYSFAULT_FLAG ? "": "not ");
681
682 PRINT_PROC("Panic on OOPS: %s\n",
683 flags & COBT_CMOS_OOPSPANIC_FLAG ? "yes": "no");
684
685 PRINT_PROC("Delayed Cache Initialization: %s\n",
686 flags & COBT_CMOS_DELAY_CACHE_FLAG ? "yes": "no");
687
688 PRINT_PROC("Show Logo at Boot: %s\n",
689 flags & COBT_CMOS_NOLOGO_FLAG ? "no": "yes");
690
691 PRINT_PROC("Boot Method: ");
692 switch (nvram[COBT_CMOS_BOOT_METHOD]) {
693 case COBT_CMOS_BOOT_METHOD_DISK:
694 PRINT_PROC("disk\n");
695 break;
696
697 case COBT_CMOS_BOOT_METHOD_ROM:
698 PRINT_PROC("rom\n");
699 break;
700
701 case COBT_CMOS_BOOT_METHOD_NET:
702 PRINT_PROC("net\n");
703 break;
704
705 default:
706 PRINT_PROC("unknown\n");
707 break;
708 }
709
710 PRINT_PROC("Primary Boot Device: %d:%d\n",
711 nvram[COBT_CMOS_BOOT_DEV0_MAJ],
712 nvram[COBT_CMOS_BOOT_DEV0_MIN] );
713 PRINT_PROC("Secondary Boot Device: %d:%d\n",
714 nvram[COBT_CMOS_BOOT_DEV1_MAJ],
715 nvram[COBT_CMOS_BOOT_DEV1_MIN] );
716 PRINT_PROC("Tertiary Boot Device: %d:%d\n",
717 nvram[COBT_CMOS_BOOT_DEV2_MAJ],
718 nvram[COBT_CMOS_BOOT_DEV2_MIN] );
719
720 PRINT_PROC("Uptime: %d\n",
721 nvram[COBT_CMOS_UPTIME_0] << 24 |
722 nvram[COBT_CMOS_UPTIME_1] << 16 |
723 nvram[COBT_CMOS_UPTIME_2] << 8 |
724 nvram[COBT_CMOS_UPTIME_3]);
725
726 PRINT_PROC("Boot Count: %d\n",
727 nvram[COBT_CMOS_BOOTCOUNT_0] << 24 |
728 nvram[COBT_CMOS_BOOTCOUNT_1] << 16 |
729 nvram[COBT_CMOS_BOOTCOUNT_2] << 8 |
730 nvram[COBT_CMOS_BOOTCOUNT_3]);
731
732 /* 13 bytes of serial num */
733 for (i=0 ; i<13 ; i++) {
734 sernum[i] = nvram[COBT_CMOS_SYS_SERNUM_0 + i];
735 }
736 sernum[13] = '\0';
737
738 checksum = 0;
739 for (i=0 ; i<13 ; i++) {
740 checksum += sernum[i] ^ key[i];
741 }
742 checksum = ((checksum & 0x7f) ^ (0xd6)) & 0xff;
743
744 PRINT_PROC("Serial Number: %s", sernum);
745 if (checksum != nvram[COBT_CMOS_SYS_SERNUM_CSUM]) {
746 PRINT_PROC(" (invalid checksum)");
747 }
748 PRINT_PROC("\n");
749
750 PRINT_PROC("Rom Revison: %d.%d.%d\n", nvram[COBT_CMOS_ROM_REV_MAJ],
751 nvram[COBT_CMOS_ROM_REV_MIN], nvram[COBT_CMOS_ROM_REV_REV]);
752
753 PRINT_PROC("BTO Server: %d.%d.%d.%d", nvram[COBT_CMOS_BTO_IP_0],
754 nvram[COBT_CMOS_BTO_IP_1], nvram[COBT_CMOS_BTO_IP_2],
755 nvram[COBT_CMOS_BTO_IP_3]);
756 bto_csum = nvram[COBT_CMOS_BTO_IP_0] + nvram[COBT_CMOS_BTO_IP_1]
757 + nvram[COBT_CMOS_BTO_IP_2] + nvram[COBT_CMOS_BTO_IP_3];
758 if (bto_csum != nvram[COBT_CMOS_BTO_IP_CSUM]) {
759 PRINT_PROC(" (invalid checksum)");
760 }
761 PRINT_PROC("\n");
762
763 if (flags & COBT_CMOS_VERSION_FLAG
764 && nvram[COBT_CMOS_VERSION] >= COBT_CMOS_VER_BTOCODE) {
765 PRINT_PROC("BTO Code: 0x%x\n",
766 nvram[COBT_CMOS_BTO_CODE_0] << 24 |
767 nvram[COBT_CMOS_BTO_CODE_1] << 16 |
768 nvram[COBT_CMOS_BTO_CODE_2] << 8 |
769 nvram[COBT_CMOS_BTO_CODE_3]);
770 }
771
772 return 1;
773}
774#endif /* CONFIG_PROC_FS */
775
776#endif /* MACH == COBALT */
777
778#if MACH == ATARI
779
780static int
781atari_check_checksum(void)
782{
783 int i;
784 unsigned char sum = 0;
785
786 for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i)
787 sum += __nvram_read_byte(i);
788 return (__nvram_read_byte(ATARI_CKS_LOC) == (~sum & 0xff) &&
789 __nvram_read_byte(ATARI_CKS_LOC + 1) == (sum & 0xff));
790}
791
792static void
793atari_set_checksum(void)
794{
795 int i;
796 unsigned char sum = 0;
797
798 for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i)
799 sum += __nvram_read_byte(i);
800 __nvram_write_byte(~sum, ATARI_CKS_LOC);
801 __nvram_write_byte(sum, ATARI_CKS_LOC + 1);
802}
803
804#ifdef CONFIG_PROC_FS
805
806static struct {
807 unsigned char val;
808 char *name;
809} boot_prefs[] = {
810 { 0x80, "TOS" },
811 { 0x40, "ASV" },
812 { 0x20, "NetBSD (?)" },
813 { 0x10, "Linux" },
814 { 0x00, "unspecified" }
815};
816
817static char *languages[] = {
818 "English (US)",
819 "German",
820 "French",
821 "English (UK)",
822 "Spanish",
823 "Italian",
824 "6 (undefined)",
825 "Swiss (French)",
826 "Swiss (German)"
827};
828
829static char *dateformat[] = {
830 "MM%cDD%cYY",
831 "DD%cMM%cYY",
832 "YY%cMM%cDD",
833 "YY%cDD%cMM",
834 "4 (undefined)",
835 "5 (undefined)",
836 "6 (undefined)",
837 "7 (undefined)"
838};
839
840static char *colors[] = {
841 "2", "4", "16", "256", "65536", "??", "??", "??"
842};
843
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844static int
845atari_proc_infos(unsigned char *nvram, char *buffer, int *len,
846 off_t *begin, off_t offset, int size)
847{
848 int checksum = nvram_check_checksum();
849 int i;
850 unsigned vmode;
851
852 PRINT_PROC("Checksum status : %svalid\n", checksum ? "" : "not ");
853
854 PRINT_PROC("Boot preference : ");
Tobias Klauserfe971072006-01-09 20:54:02 -0800855 for (i = ARRAY_SIZE(boot_prefs) - 1; i >= 0; --i) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856 if (nvram[1] == boot_prefs[i].val) {
857 PRINT_PROC("%s\n", boot_prefs[i].name);
858 break;
859 }
860 }
861 if (i < 0)
862 PRINT_PROC("0x%02x (undefined)\n", nvram[1]);
863
864 PRINT_PROC("SCSI arbitration : %s\n",
865 (nvram[16] & 0x80) ? "on" : "off");
866 PRINT_PROC("SCSI host ID : ");
867 if (nvram[16] & 0x80)
868 PRINT_PROC("%d\n", nvram[16] & 7);
869 else
870 PRINT_PROC("n/a\n");
871
872 /* the following entries are defined only for the Falcon */
873 if ((atari_mch_cookie >> 16) != ATARI_MCH_FALCON)
874 return 1;
875
876 PRINT_PROC("OS language : ");
Tobias Klauserfe971072006-01-09 20:54:02 -0800877 if (nvram[6] < ARRAY_SIZE(languages))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 PRINT_PROC("%s\n", languages[nvram[6]]);
879 else
880 PRINT_PROC("%u (undefined)\n", nvram[6]);
881 PRINT_PROC("Keyboard language: ");
Tobias Klauserfe971072006-01-09 20:54:02 -0800882 if (nvram[7] < ARRAY_SIZE(languages))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 PRINT_PROC("%s\n", languages[nvram[7]]);
884 else
885 PRINT_PROC("%u (undefined)\n", nvram[7]);
886 PRINT_PROC("Date format : ");
887 PRINT_PROC(dateformat[nvram[8] & 7],
888 nvram[9] ? nvram[9] : '/', nvram[9] ? nvram[9] : '/');
889 PRINT_PROC(", %dh clock\n", nvram[8] & 16 ? 24 : 12);
890 PRINT_PROC("Boot delay : ");
891 if (nvram[10] == 0)
892 PRINT_PROC("default");
893 else
894 PRINT_PROC("%ds%s\n", nvram[10],
895 nvram[10] < 8 ? ", no memory test" : "");
896
897 vmode = (nvram[14] << 8) || nvram[15];
898 PRINT_PROC("Video mode : %s colors, %d columns, %s %s monitor\n",
899 colors[vmode & 7],
900 vmode & 8 ? 80 : 40,
901 vmode & 16 ? "VGA" : "TV", vmode & 32 ? "PAL" : "NTSC");
902 PRINT_PROC(" %soverscan, compat. mode %s%s\n",
903 vmode & 64 ? "" : "no ",
904 vmode & 128 ? "on" : "off",
905 vmode & 256 ?
906 (vmode & 16 ? ", line doubling" : ", half screen") : "");
907
908 return 1;
909}
910#endif
911
912#endif /* MACH == ATARI */
913
914MODULE_LICENSE("GPL");
915
916EXPORT_SYMBOL(__nvram_read_byte);
917EXPORT_SYMBOL(nvram_read_byte);
918EXPORT_SYMBOL(__nvram_write_byte);
919EXPORT_SYMBOL(nvram_write_byte);
920EXPORT_SYMBOL(__nvram_check_checksum);
921EXPORT_SYMBOL(nvram_check_checksum);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922MODULE_ALIAS_MISCDEV(NVRAM_MINOR);