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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 | |
8587b33f | 35 | * 1.3 Wim Van Sebroeck: convert PRINT_PROC to seq_file |
1da177e4 LT |
36 | */ |
37 | ||
8587b33f | 38 | #define NVRAM_VERSION "1.3" |
1da177e4 LT |
39 | |
40 | #include <linux/module.h> | |
1da177e4 LT |
41 | #include <linux/nvram.h> |
42 | ||
43 | #define PC 1 | |
44 | #define ATARI 2 | |
1da177e4 LT |
45 | |
46 | /* select machine configuration */ | |
47 | #if defined(CONFIG_ATARI) | |
48 | # define MACH ATARI | |
971ddcf8 | 49 | #elif defined(__i386__) || defined(__x86_64__) || defined(__arm__) /* and ?? */ |
ea5a3dcf | 50 | # define MACH PC |
1da177e4 LT |
51 | #else |
52 | # error Cannot build nvram driver for this machine configuration. | |
53 | #endif | |
54 | ||
55 | #if MACH == PC | |
56 | ||
57 | /* RTC in a PC */ | |
58 | #define CHECK_DRIVER_INIT() 1 | |
59 | ||
60 | /* On PCs, the checksum is built only over bytes 2..31 */ | |
61 | #define PC_CKS_RANGE_START 2 | |
62 | #define PC_CKS_RANGE_END 31 | |
63 | #define PC_CKS_LOC 32 | |
64 | #define NVRAM_BYTES (128-NVRAM_FIRST_BYTE) | |
65 | ||
66 | #define mach_check_checksum pc_check_checksum | |
67 | #define mach_set_checksum pc_set_checksum | |
68 | #define mach_proc_infos pc_proc_infos | |
69 | ||
70 | #endif | |
71 | ||
1da177e4 LT |
72 | #if MACH == ATARI |
73 | ||
74 | /* Special parameters for RTC in Atari machines */ | |
75 | #include <asm/atarihw.h> | |
76 | #include <asm/atariints.h> | |
77 | #define RTC_PORT(x) (TT_RTC_BAS + 2*(x)) | |
78 | #define CHECK_DRIVER_INIT() (MACH_IS_ATARI && ATARIHW_PRESENT(TT_CLK)) | |
79 | ||
80 | #define NVRAM_BYTES 50 | |
81 | ||
82 | /* On Ataris, the checksum is over all bytes except the checksum bytes | |
83 | * themselves; these are at the very end */ | |
84 | #define ATARI_CKS_RANGE_START 0 | |
85 | #define ATARI_CKS_RANGE_END 47 | |
86 | #define ATARI_CKS_LOC 48 | |
87 | ||
88 | #define mach_check_checksum atari_check_checksum | |
89 | #define mach_set_checksum atari_set_checksum | |
90 | #define mach_proc_infos atari_proc_infos | |
91 | ||
92 | #endif | |
93 | ||
94 | /* Note that *all* calls to CMOS_READ and CMOS_WRITE must be done with | |
95 | * rtc_lock held. Due to the index-port/data-port design of the RTC, we | |
96 | * don't want two different things trying to get to it at once. (e.g. the | |
97 | * periodic 11 min sync from time.c vs. this driver.) | |
98 | */ | |
99 | ||
100 | #include <linux/types.h> | |
101 | #include <linux/errno.h> | |
102 | #include <linux/miscdevice.h> | |
1da177e4 LT |
103 | #include <linux/ioport.h> |
104 | #include <linux/fcntl.h> | |
105 | #include <linux/mc146818rtc.h> | |
106 | #include <linux/init.h> | |
107 | #include <linux/proc_fs.h> | |
8587b33f | 108 | #include <linux/seq_file.h> |
1da177e4 | 109 | #include <linux/spinlock.h> |
971ddcf8 WVS |
110 | #include <linux/io.h> |
111 | #include <linux/uaccess.h> | |
79a56ed0 | 112 | #include <linux/smp_lock.h> |
1da177e4 | 113 | |
1da177e4 LT |
114 | #include <asm/system.h> |
115 | ||
116 | static DEFINE_SPINLOCK(nvram_state_lock); | |
117 | static int nvram_open_cnt; /* #times opened */ | |
118 | static int nvram_open_mode; /* special open modes */ | |
119 | #define NVRAM_WRITE 1 /* opened for writing (exclusive) */ | |
120 | #define NVRAM_EXCL 2 /* opened with O_EXCL */ | |
121 | ||
122 | static int mach_check_checksum(void); | |
123 | static void mach_set_checksum(void); | |
124 | ||
125 | #ifdef CONFIG_PROC_FS | |
8587b33f WVS |
126 | static void mach_proc_infos(unsigned char *contents, struct seq_file *seq, |
127 | void *offset); | |
1da177e4 LT |
128 | #endif |
129 | ||
130 | /* | |
131 | * These functions are provided to be called internally or by other parts of | |
132 | * the kernel. It's up to the caller to ensure correct checksum before reading | |
133 | * or after writing (needs to be done only once). | |
134 | * | |
135 | * It is worth noting that these functions all access bytes of general | |
136 | * purpose memory in the NVRAM - that is to say, they all add the | |
971ddcf8 | 137 | * NVRAM_FIRST_BYTE offset. Pass them offsets into NVRAM as if you did not |
1da177e4 LT |
138 | * know about the RTC cruft. |
139 | */ | |
140 | ||
971ddcf8 | 141 | unsigned char __nvram_read_byte(int i) |
1da177e4 LT |
142 | { |
143 | return CMOS_READ(NVRAM_FIRST_BYTE + i); | |
144 | } | |
971ddcf8 | 145 | EXPORT_SYMBOL(__nvram_read_byte); |
1da177e4 | 146 | |
971ddcf8 | 147 | unsigned char nvram_read_byte(int i) |
1da177e4 LT |
148 | { |
149 | unsigned long flags; | |
150 | unsigned char c; | |
151 | ||
152 | spin_lock_irqsave(&rtc_lock, flags); | |
153 | c = __nvram_read_byte(i); | |
154 | spin_unlock_irqrestore(&rtc_lock, flags); | |
155 | return c; | |
156 | } | |
971ddcf8 | 157 | EXPORT_SYMBOL(nvram_read_byte); |
1da177e4 LT |
158 | |
159 | /* This races nicely with trying to read with checksum checking (nvram_read) */ | |
971ddcf8 | 160 | void __nvram_write_byte(unsigned char c, int i) |
1da177e4 LT |
161 | { |
162 | CMOS_WRITE(c, NVRAM_FIRST_BYTE + i); | |
163 | } | |
971ddcf8 | 164 | EXPORT_SYMBOL(__nvram_write_byte); |
1da177e4 | 165 | |
971ddcf8 | 166 | void nvram_write_byte(unsigned char c, int i) |
1da177e4 LT |
167 | { |
168 | unsigned long flags; | |
169 | ||
170 | spin_lock_irqsave(&rtc_lock, flags); | |
171 | __nvram_write_byte(c, i); | |
172 | spin_unlock_irqrestore(&rtc_lock, flags); | |
173 | } | |
971ddcf8 | 174 | EXPORT_SYMBOL(nvram_write_byte); |
1da177e4 | 175 | |
971ddcf8 | 176 | int __nvram_check_checksum(void) |
1da177e4 LT |
177 | { |
178 | return mach_check_checksum(); | |
179 | } | |
971ddcf8 | 180 | EXPORT_SYMBOL(__nvram_check_checksum); |
1da177e4 | 181 | |
971ddcf8 | 182 | int nvram_check_checksum(void) |
1da177e4 LT |
183 | { |
184 | unsigned long flags; | |
185 | int rv; | |
186 | ||
187 | spin_lock_irqsave(&rtc_lock, flags); | |
188 | rv = __nvram_check_checksum(); | |
189 | spin_unlock_irqrestore(&rtc_lock, flags); | |
190 | return rv; | |
191 | } | |
971ddcf8 | 192 | EXPORT_SYMBOL(nvram_check_checksum); |
1da177e4 | 193 | |
971ddcf8 | 194 | static void __nvram_set_checksum(void) |
1da177e4 LT |
195 | { |
196 | mach_set_checksum(); | |
197 | } | |
198 | ||
681ea4b9 | 199 | #if 0 |
971ddcf8 | 200 | void nvram_set_checksum(void) |
1da177e4 LT |
201 | { |
202 | unsigned long flags; | |
203 | ||
204 | spin_lock_irqsave(&rtc_lock, flags); | |
205 | __nvram_set_checksum(); | |
206 | spin_unlock_irqrestore(&rtc_lock, flags); | |
207 | } | |
681ea4b9 | 208 | #endif /* 0 */ |
1da177e4 LT |
209 | |
210 | /* | |
211 | * The are the file operation function for user access to /dev/nvram | |
212 | */ | |
213 | ||
971ddcf8 | 214 | static loff_t nvram_llseek(struct file *file, loff_t offset, int origin) |
1da177e4 | 215 | { |
1da177e4 LT |
216 | switch (origin) { |
217 | case 0: | |
218 | /* nothing to do */ | |
219 | break; | |
220 | case 1: | |
221 | offset += file->f_pos; | |
222 | break; | |
223 | case 2: | |
224 | offset += NVRAM_BYTES; | |
225 | break; | |
226 | } | |
9e8ab74d | 227 | |
1da177e4 LT |
228 | return (offset >= 0) ? (file->f_pos = offset) : -EINVAL; |
229 | } | |
230 | ||
971ddcf8 WVS |
231 | static ssize_t nvram_read(struct file *file, char __user *buf, |
232 | size_t count, loff_t *ppos) | |
1da177e4 LT |
233 | { |
234 | unsigned char contents[NVRAM_BYTES]; | |
235 | unsigned i = *ppos; | |
236 | unsigned char *tmp; | |
237 | ||
238 | spin_lock_irq(&rtc_lock); | |
239 | ||
240 | if (!__nvram_check_checksum()) | |
241 | goto checksum_err; | |
242 | ||
243 | for (tmp = contents; count-- > 0 && i < NVRAM_BYTES; ++i, ++tmp) | |
244 | *tmp = __nvram_read_byte(i); | |
245 | ||
246 | spin_unlock_irq(&rtc_lock); | |
247 | ||
248 | if (copy_to_user(buf, contents, tmp - contents)) | |
249 | return -EFAULT; | |
250 | ||
251 | *ppos = i; | |
252 | ||
253 | return tmp - contents; | |
254 | ||
971ddcf8 | 255 | checksum_err: |
1da177e4 LT |
256 | spin_unlock_irq(&rtc_lock); |
257 | return -EIO; | |
258 | } | |
259 | ||
971ddcf8 WVS |
260 | static ssize_t nvram_write(struct file *file, const char __user *buf, |
261 | size_t count, loff_t *ppos) | |
1da177e4 LT |
262 | { |
263 | unsigned char contents[NVRAM_BYTES]; | |
264 | unsigned i = *ppos; | |
265 | unsigned char *tmp; | |
1da177e4 | 266 | |
a01c7800 PA |
267 | if (i >= NVRAM_BYTES) |
268 | return 0; /* Past EOF */ | |
269 | ||
270 | if (count > NVRAM_BYTES - i) | |
271 | count = NVRAM_BYTES - i; | |
272 | if (count > NVRAM_BYTES) | |
273 | return -EFAULT; /* Can't happen, but prove it to gcc */ | |
274 | ||
275 | if (copy_from_user(contents, buf, count)) | |
1da177e4 LT |
276 | return -EFAULT; |
277 | ||
278 | spin_lock_irq(&rtc_lock); | |
279 | ||
280 | if (!__nvram_check_checksum()) | |
281 | goto checksum_err; | |
282 | ||
a01c7800 | 283 | for (tmp = contents; count--; ++i, ++tmp) |
1da177e4 LT |
284 | __nvram_write_byte(*tmp, i); |
285 | ||
286 | __nvram_set_checksum(); | |
287 | ||
288 | spin_unlock_irq(&rtc_lock); | |
289 | ||
290 | *ppos = i; | |
291 | ||
292 | return tmp - contents; | |
293 | ||
971ddcf8 | 294 | checksum_err: |
1da177e4 LT |
295 | spin_unlock_irq(&rtc_lock); |
296 | return -EIO; | |
297 | } | |
298 | ||
971ddcf8 WVS |
299 | static int nvram_ioctl(struct inode *inode, struct file *file, |
300 | unsigned int cmd, unsigned long arg) | |
1da177e4 LT |
301 | { |
302 | int i; | |
303 | ||
304 | switch (cmd) { | |
305 | ||
306 | case NVRAM_INIT: | |
307 | /* initialize NVRAM contents and checksum */ | |
308 | if (!capable(CAP_SYS_ADMIN)) | |
309 | return -EACCES; | |
310 | ||
311 | spin_lock_irq(&rtc_lock); | |
312 | ||
313 | for (i = 0; i < NVRAM_BYTES; ++i) | |
314 | __nvram_write_byte(0, i); | |
315 | __nvram_set_checksum(); | |
316 | ||
317 | spin_unlock_irq(&rtc_lock); | |
318 | return 0; | |
319 | ||
320 | case NVRAM_SETCKS: | |
971ddcf8 | 321 | /* just set checksum, contents unchanged (maybe useful after |
1da177e4 LT |
322 | * checksum garbaged somehow...) */ |
323 | if (!capable(CAP_SYS_ADMIN)) | |
324 | return -EACCES; | |
325 | ||
326 | spin_lock_irq(&rtc_lock); | |
327 | __nvram_set_checksum(); | |
328 | spin_unlock_irq(&rtc_lock); | |
329 | return 0; | |
330 | ||
331 | default: | |
332 | return -ENOTTY; | |
333 | } | |
334 | } | |
335 | ||
971ddcf8 | 336 | static int nvram_open(struct inode *inode, struct file *file) |
1da177e4 LT |
337 | { |
338 | spin_lock(&nvram_state_lock); | |
339 | ||
340 | if ((nvram_open_cnt && (file->f_flags & O_EXCL)) || | |
341 | (nvram_open_mode & NVRAM_EXCL) || | |
aeb5d727 | 342 | ((file->f_mode & FMODE_WRITE) && (nvram_open_mode & NVRAM_WRITE))) { |
1da177e4 LT |
343 | spin_unlock(&nvram_state_lock); |
344 | return -EBUSY; | |
345 | } | |
346 | ||
347 | if (file->f_flags & O_EXCL) | |
348 | nvram_open_mode |= NVRAM_EXCL; | |
aeb5d727 | 349 | if (file->f_mode & FMODE_WRITE) |
1da177e4 LT |
350 | nvram_open_mode |= NVRAM_WRITE; |
351 | nvram_open_cnt++; | |
352 | ||
353 | spin_unlock(&nvram_state_lock); | |
354 | ||
355 | return 0; | |
356 | } | |
357 | ||
971ddcf8 | 358 | static int nvram_release(struct inode *inode, struct file *file) |
1da177e4 LT |
359 | { |
360 | spin_lock(&nvram_state_lock); | |
361 | ||
362 | nvram_open_cnt--; | |
363 | ||
364 | /* if only one instance is open, clear the EXCL bit */ | |
365 | if (nvram_open_mode & NVRAM_EXCL) | |
366 | nvram_open_mode &= ~NVRAM_EXCL; | |
aeb5d727 | 367 | if (file->f_mode & FMODE_WRITE) |
1da177e4 LT |
368 | nvram_open_mode &= ~NVRAM_WRITE; |
369 | ||
370 | spin_unlock(&nvram_state_lock); | |
371 | ||
372 | return 0; | |
373 | } | |
374 | ||
375 | #ifndef CONFIG_PROC_FS | |
8587b33f | 376 | static int nvram_add_proc_fs(void) |
1da177e4 LT |
377 | { |
378 | return 0; | |
379 | } | |
8587b33f | 380 | |
1da177e4 LT |
381 | #else |
382 | ||
8587b33f | 383 | static int nvram_proc_read(struct seq_file *seq, void *offset) |
1da177e4 LT |
384 | { |
385 | unsigned char contents[NVRAM_BYTES]; | |
8587b33f | 386 | int i = 0; |
1da177e4 LT |
387 | |
388 | spin_lock_irq(&rtc_lock); | |
389 | for (i = 0; i < NVRAM_BYTES; ++i) | |
390 | contents[i] = __nvram_read_byte(i); | |
391 | spin_unlock_irq(&rtc_lock); | |
392 | ||
8587b33f | 393 | mach_proc_infos(contents, seq, offset); |
1da177e4 | 394 | |
8587b33f WVS |
395 | return 0; |
396 | } | |
1da177e4 | 397 | |
8587b33f WVS |
398 | static int nvram_proc_open(struct inode *inode, struct file *file) |
399 | { | |
400 | return single_open(file, nvram_proc_read, NULL); | |
1da177e4 LT |
401 | } |
402 | ||
8587b33f WVS |
403 | static const struct file_operations nvram_proc_fops = { |
404 | .owner = THIS_MODULE, | |
405 | .open = nvram_proc_open, | |
406 | .read = seq_read, | |
407 | .llseek = seq_lseek, | |
408 | .release = single_release, | |
409 | }; | |
410 | ||
411 | static int nvram_add_proc_fs(void) | |
412 | { | |
413 | if (!proc_create("driver/nvram", 0, NULL, &nvram_proc_fops)) | |
414 | return -ENOMEM; | |
415 | return 0; | |
416 | } | |
1da177e4 LT |
417 | |
418 | #endif /* CONFIG_PROC_FS */ | |
419 | ||
62322d25 | 420 | static const struct file_operations nvram_fops = { |
1da177e4 LT |
421 | .owner = THIS_MODULE, |
422 | .llseek = nvram_llseek, | |
423 | .read = nvram_read, | |
424 | .write = nvram_write, | |
425 | .ioctl = nvram_ioctl, | |
426 | .open = nvram_open, | |
427 | .release = nvram_release, | |
428 | }; | |
429 | ||
430 | static struct miscdevice nvram_dev = { | |
431 | NVRAM_MINOR, | |
432 | "nvram", | |
433 | &nvram_fops | |
434 | }; | |
435 | ||
971ddcf8 | 436 | static int __init nvram_init(void) |
1da177e4 LT |
437 | { |
438 | int ret; | |
439 | ||
440 | /* First test whether the driver should init at all */ | |
441 | if (!CHECK_DRIVER_INIT()) | |
e945b568 | 442 | return -ENODEV; |
1da177e4 LT |
443 | |
444 | ret = misc_register(&nvram_dev); | |
445 | if (ret) { | |
446 | printk(KERN_ERR "nvram: can't misc_register on minor=%d\n", | |
447 | NVRAM_MINOR); | |
448 | goto out; | |
449 | } | |
8587b33f WVS |
450 | ret = nvram_add_proc_fs(); |
451 | if (ret) { | |
1da177e4 | 452 | printk(KERN_ERR "nvram: can't create /proc/driver/nvram\n"); |
1da177e4 LT |
453 | goto outmisc; |
454 | } | |
455 | ret = 0; | |
456 | printk(KERN_INFO "Non-volatile memory driver v" NVRAM_VERSION "\n"); | |
971ddcf8 | 457 | out: |
1da177e4 | 458 | return ret; |
971ddcf8 | 459 | outmisc: |
1da177e4 LT |
460 | misc_deregister(&nvram_dev); |
461 | goto out; | |
462 | } | |
463 | ||
971ddcf8 | 464 | static void __exit nvram_cleanup_module(void) |
1da177e4 LT |
465 | { |
466 | remove_proc_entry("driver/nvram", NULL); | |
467 | misc_deregister(&nvram_dev); | |
468 | } | |
469 | ||
470 | module_init(nvram_init); | |
471 | module_exit(nvram_cleanup_module); | |
472 | ||
473 | /* | |
474 | * Machine specific functions | |
475 | */ | |
476 | ||
477 | #if MACH == PC | |
478 | ||
971ddcf8 | 479 | static int pc_check_checksum(void) |
1da177e4 LT |
480 | { |
481 | int i; | |
482 | unsigned short sum = 0; | |
483 | unsigned short expect; | |
484 | ||
485 | for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i) | |
486 | sum += __nvram_read_byte(i); | |
487 | expect = __nvram_read_byte(PC_CKS_LOC)<<8 | | |
488 | __nvram_read_byte(PC_CKS_LOC+1); | |
971ddcf8 | 489 | return (sum & 0xffff) == expect; |
1da177e4 LT |
490 | } |
491 | ||
971ddcf8 | 492 | static void pc_set_checksum(void) |
1da177e4 LT |
493 | { |
494 | int i; | |
495 | unsigned short sum = 0; | |
496 | ||
497 | for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i) | |
498 | sum += __nvram_read_byte(i); | |
499 | __nvram_write_byte(sum >> 8, PC_CKS_LOC); | |
500 | __nvram_write_byte(sum & 0xff, PC_CKS_LOC + 1); | |
501 | } | |
502 | ||
503 | #ifdef CONFIG_PROC_FS | |
504 | ||
505 | static char *floppy_types[] = { | |
506 | "none", "5.25'' 360k", "5.25'' 1.2M", "3.5'' 720k", "3.5'' 1.44M", | |
507 | "3.5'' 2.88M", "3.5'' 2.88M" | |
508 | }; | |
509 | ||
510 | static char *gfx_types[] = { | |
511 | "EGA, VGA, ... (with BIOS)", | |
512 | "CGA (40 cols)", | |
513 | "CGA (80 cols)", | |
514 | "monochrome", | |
515 | }; | |
516 | ||
8587b33f WVS |
517 | static void pc_proc_infos(unsigned char *nvram, struct seq_file *seq, |
518 | void *offset) | |
1da177e4 LT |
519 | { |
520 | int checksum; | |
521 | int type; | |
522 | ||
523 | spin_lock_irq(&rtc_lock); | |
524 | checksum = __nvram_check_checksum(); | |
525 | spin_unlock_irq(&rtc_lock); | |
526 | ||
8587b33f | 527 | seq_printf(seq, "Checksum status: %svalid\n", checksum ? "" : "not "); |
1da177e4 | 528 | |
8587b33f | 529 | seq_printf(seq, "# floppies : %d\n", |
1da177e4 | 530 | (nvram[6] & 1) ? (nvram[6] >> 6) + 1 : 0); |
8587b33f | 531 | seq_printf(seq, "Floppy 0 type : "); |
1da177e4 | 532 | type = nvram[2] >> 4; |
fe971071 | 533 | if (type < ARRAY_SIZE(floppy_types)) |
8587b33f | 534 | seq_printf(seq, "%s\n", floppy_types[type]); |
1da177e4 | 535 | else |
8587b33f WVS |
536 | seq_printf(seq, "%d (unknown)\n", type); |
537 | seq_printf(seq, "Floppy 1 type : "); | |
1da177e4 | 538 | type = nvram[2] & 0x0f; |
fe971071 | 539 | if (type < ARRAY_SIZE(floppy_types)) |
8587b33f | 540 | seq_printf(seq, "%s\n", floppy_types[type]); |
1da177e4 | 541 | else |
8587b33f | 542 | seq_printf(seq, "%d (unknown)\n", type); |
1da177e4 | 543 | |
8587b33f | 544 | seq_printf(seq, "HD 0 type : "); |
1da177e4 LT |
545 | type = nvram[4] >> 4; |
546 | if (type) | |
8587b33f | 547 | seq_printf(seq, "%02x\n", type == 0x0f ? nvram[11] : type); |
1da177e4 | 548 | else |
8587b33f | 549 | seq_printf(seq, "none\n"); |
1da177e4 | 550 | |
8587b33f | 551 | seq_printf(seq, "HD 1 type : "); |
1da177e4 LT |
552 | type = nvram[4] & 0x0f; |
553 | if (type) | |
8587b33f | 554 | seq_printf(seq, "%02x\n", type == 0x0f ? nvram[12] : type); |
1da177e4 | 555 | else |
8587b33f | 556 | seq_printf(seq, "none\n"); |
1da177e4 | 557 | |
8587b33f | 558 | seq_printf(seq, "HD type 48 data: %d/%d/%d C/H/S, precomp %d, lz %d\n", |
1da177e4 LT |
559 | nvram[18] | (nvram[19] << 8), |
560 | nvram[20], nvram[25], | |
561 | nvram[21] | (nvram[22] << 8), nvram[23] | (nvram[24] << 8)); | |
8587b33f | 562 | seq_printf(seq, "HD type 49 data: %d/%d/%d C/H/S, precomp %d, lz %d\n", |
1da177e4 LT |
563 | nvram[39] | (nvram[40] << 8), |
564 | nvram[41], nvram[46], | |
565 | nvram[42] | (nvram[43] << 8), nvram[44] | (nvram[45] << 8)); | |
566 | ||
8587b33f WVS |
567 | seq_printf(seq, "DOS base memory: %d kB\n", nvram[7] | (nvram[8] << 8)); |
568 | seq_printf(seq, "Extended memory: %d kB (configured), %d kB (tested)\n", | |
1da177e4 LT |
569 | nvram[9] | (nvram[10] << 8), nvram[34] | (nvram[35] << 8)); |
570 | ||
8587b33f WVS |
571 | seq_printf(seq, "Gfx adapter : %s\n", |
572 | gfx_types[(nvram[6] >> 4) & 3]); | |
1da177e4 | 573 | |
8587b33f | 574 | seq_printf(seq, "FPU : %sinstalled\n", |
1da177e4 LT |
575 | (nvram[6] & 2) ? "" : "not "); |
576 | ||
8587b33f | 577 | return; |
1da177e4 LT |
578 | } |
579 | #endif | |
580 | ||
581 | #endif /* MACH == PC */ | |
582 | ||
1da177e4 LT |
583 | #if MACH == ATARI |
584 | ||
971ddcf8 | 585 | static int atari_check_checksum(void) |
1da177e4 LT |
586 | { |
587 | int i; | |
588 | unsigned char sum = 0; | |
589 | ||
590 | for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i) | |
591 | sum += __nvram_read_byte(i); | |
971ddcf8 WVS |
592 | return (__nvram_read_byte(ATARI_CKS_LOC) == (~sum & 0xff)) && |
593 | (__nvram_read_byte(ATARI_CKS_LOC + 1) == (sum & 0xff)); | |
1da177e4 LT |
594 | } |
595 | ||
971ddcf8 | 596 | static void atari_set_checksum(void) |
1da177e4 LT |
597 | { |
598 | int i; | |
599 | unsigned char sum = 0; | |
600 | ||
601 | for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i) | |
602 | sum += __nvram_read_byte(i); | |
603 | __nvram_write_byte(~sum, ATARI_CKS_LOC); | |
604 | __nvram_write_byte(sum, ATARI_CKS_LOC + 1); | |
605 | } | |
606 | ||
607 | #ifdef CONFIG_PROC_FS | |
608 | ||
609 | static struct { | |
610 | unsigned char val; | |
611 | char *name; | |
612 | } boot_prefs[] = { | |
613 | { 0x80, "TOS" }, | |
614 | { 0x40, "ASV" }, | |
615 | { 0x20, "NetBSD (?)" }, | |
616 | { 0x10, "Linux" }, | |
617 | { 0x00, "unspecified" } | |
618 | }; | |
619 | ||
620 | static char *languages[] = { | |
621 | "English (US)", | |
622 | "German", | |
623 | "French", | |
624 | "English (UK)", | |
625 | "Spanish", | |
626 | "Italian", | |
627 | "6 (undefined)", | |
628 | "Swiss (French)", | |
629 | "Swiss (German)" | |
630 | }; | |
631 | ||
632 | static char *dateformat[] = { | |
633 | "MM%cDD%cYY", | |
634 | "DD%cMM%cYY", | |
635 | "YY%cMM%cDD", | |
636 | "YY%cDD%cMM", | |
637 | "4 (undefined)", | |
638 | "5 (undefined)", | |
639 | "6 (undefined)", | |
640 | "7 (undefined)" | |
641 | }; | |
642 | ||
643 | static char *colors[] = { | |
644 | "2", "4", "16", "256", "65536", "??", "??", "??" | |
645 | }; | |
646 | ||
8587b33f WVS |
647 | static void atari_proc_infos(unsigned char *nvram, struct seq_file *seq, |
648 | void *offset) | |
1da177e4 LT |
649 | { |
650 | int checksum = nvram_check_checksum(); | |
651 | int i; | |
652 | unsigned vmode; | |
653 | ||
8587b33f | 654 | seq_printf(seq, "Checksum status : %svalid\n", checksum ? "" : "not "); |
1da177e4 | 655 | |
8587b33f | 656 | seq_printf(seq, "Boot preference : "); |
fe971071 | 657 | for (i = ARRAY_SIZE(boot_prefs) - 1; i >= 0; --i) { |
1da177e4 | 658 | if (nvram[1] == boot_prefs[i].val) { |
8587b33f | 659 | seq_printf(seq, "%s\n", boot_prefs[i].name); |
1da177e4 LT |
660 | break; |
661 | } | |
662 | } | |
663 | if (i < 0) | |
8587b33f | 664 | seq_printf(seq, "0x%02x (undefined)\n", nvram[1]); |
1da177e4 | 665 | |
8587b33f | 666 | seq_printf(seq, "SCSI arbitration : %s\n", |
1da177e4 | 667 | (nvram[16] & 0x80) ? "on" : "off"); |
8587b33f | 668 | seq_printf(seq, "SCSI host ID : "); |
1da177e4 | 669 | if (nvram[16] & 0x80) |
8587b33f | 670 | seq_printf(seq, "%d\n", nvram[16] & 7); |
1da177e4 | 671 | else |
8587b33f | 672 | seq_printf(seq, "n/a\n"); |
1da177e4 LT |
673 | |
674 | /* the following entries are defined only for the Falcon */ | |
675 | if ((atari_mch_cookie >> 16) != ATARI_MCH_FALCON) | |
8587b33f | 676 | return; |
1da177e4 | 677 | |
8587b33f | 678 | seq_printf(seq, "OS language : "); |
fe971071 | 679 | if (nvram[6] < ARRAY_SIZE(languages)) |
8587b33f | 680 | seq_printf(seq, "%s\n", languages[nvram[6]]); |
1da177e4 | 681 | else |
8587b33f WVS |
682 | seq_printf(seq, "%u (undefined)\n", nvram[6]); |
683 | seq_printf(seq, "Keyboard language: "); | |
fe971071 | 684 | if (nvram[7] < ARRAY_SIZE(languages)) |
8587b33f | 685 | seq_printf(seq, "%s\n", languages[nvram[7]]); |
1da177e4 | 686 | else |
8587b33f WVS |
687 | seq_printf(seq, "%u (undefined)\n", nvram[7]); |
688 | seq_printf(seq, "Date format : "); | |
689 | seq_printf(seq, dateformat[nvram[8] & 7], | |
1da177e4 | 690 | nvram[9] ? nvram[9] : '/', nvram[9] ? nvram[9] : '/'); |
8587b33f WVS |
691 | seq_printf(seq, ", %dh clock\n", nvram[8] & 16 ? 24 : 12); |
692 | seq_printf(seq, "Boot delay : "); | |
1da177e4 | 693 | if (nvram[10] == 0) |
8587b33f | 694 | seq_printf(seq, "default"); |
1da177e4 | 695 | else |
8587b33f | 696 | seq_printf(seq, "%ds%s\n", nvram[10], |
1da177e4 LT |
697 | nvram[10] < 8 ? ", no memory test" : ""); |
698 | ||
699 | vmode = (nvram[14] << 8) || nvram[15]; | |
8587b33f WVS |
700 | seq_printf(seq, |
701 | "Video mode : %s colors, %d columns, %s %s monitor\n", | |
1da177e4 LT |
702 | colors[vmode & 7], |
703 | vmode & 8 ? 80 : 40, | |
704 | vmode & 16 ? "VGA" : "TV", vmode & 32 ? "PAL" : "NTSC"); | |
8587b33f | 705 | seq_printf(seq, " %soverscan, compat. mode %s%s\n", |
1da177e4 LT |
706 | vmode & 64 ? "" : "no ", |
707 | vmode & 128 ? "on" : "off", | |
708 | vmode & 256 ? | |
709 | (vmode & 16 ? ", line doubling" : ", half screen") : ""); | |
710 | ||
8587b33f | 711 | return; |
1da177e4 LT |
712 | } |
713 | #endif | |
714 | ||
715 | #endif /* MACH == ATARI */ | |
716 | ||
717 | MODULE_LICENSE("GPL"); | |
1da177e4 | 718 | MODULE_ALIAS_MISCDEV(NVRAM_MINOR); |