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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> | |
613655fa | 112 | #include <linux/mutex.h> |
1da177e4 | 113 | |
1da177e4 LT |
114 | #include <asm/system.h> |
115 | ||
613655fa | 116 | static DEFINE_MUTEX(nvram_mutex); |
1da177e4 LT |
117 | static DEFINE_SPINLOCK(nvram_state_lock); |
118 | static int nvram_open_cnt; /* #times opened */ | |
119 | static int nvram_open_mode; /* special open modes */ | |
120 | #define NVRAM_WRITE 1 /* opened for writing (exclusive) */ | |
121 | #define NVRAM_EXCL 2 /* opened with O_EXCL */ | |
122 | ||
123 | static int mach_check_checksum(void); | |
124 | static void mach_set_checksum(void); | |
125 | ||
126 | #ifdef CONFIG_PROC_FS | |
8587b33f WVS |
127 | static void mach_proc_infos(unsigned char *contents, struct seq_file *seq, |
128 | void *offset); | |
1da177e4 LT |
129 | #endif |
130 | ||
131 | /* | |
132 | * These functions are provided to be called internally or by other parts of | |
133 | * the kernel. It's up to the caller to ensure correct checksum before reading | |
134 | * or after writing (needs to be done only once). | |
135 | * | |
136 | * It is worth noting that these functions all access bytes of general | |
137 | * purpose memory in the NVRAM - that is to say, they all add the | |
971ddcf8 | 138 | * NVRAM_FIRST_BYTE offset. Pass them offsets into NVRAM as if you did not |
1da177e4 LT |
139 | * know about the RTC cruft. |
140 | */ | |
141 | ||
971ddcf8 | 142 | unsigned char __nvram_read_byte(int i) |
1da177e4 LT |
143 | { |
144 | return CMOS_READ(NVRAM_FIRST_BYTE + i); | |
145 | } | |
971ddcf8 | 146 | EXPORT_SYMBOL(__nvram_read_byte); |
1da177e4 | 147 | |
971ddcf8 | 148 | unsigned char nvram_read_byte(int i) |
1da177e4 LT |
149 | { |
150 | unsigned long flags; | |
151 | unsigned char c; | |
152 | ||
153 | spin_lock_irqsave(&rtc_lock, flags); | |
154 | c = __nvram_read_byte(i); | |
155 | spin_unlock_irqrestore(&rtc_lock, flags); | |
156 | return c; | |
157 | } | |
971ddcf8 | 158 | EXPORT_SYMBOL(nvram_read_byte); |
1da177e4 LT |
159 | |
160 | /* This races nicely with trying to read with checksum checking (nvram_read) */ | |
971ddcf8 | 161 | void __nvram_write_byte(unsigned char c, int i) |
1da177e4 LT |
162 | { |
163 | CMOS_WRITE(c, NVRAM_FIRST_BYTE + i); | |
164 | } | |
971ddcf8 | 165 | EXPORT_SYMBOL(__nvram_write_byte); |
1da177e4 | 166 | |
971ddcf8 | 167 | void nvram_write_byte(unsigned char c, int i) |
1da177e4 LT |
168 | { |
169 | unsigned long flags; | |
170 | ||
171 | spin_lock_irqsave(&rtc_lock, flags); | |
172 | __nvram_write_byte(c, i); | |
173 | spin_unlock_irqrestore(&rtc_lock, flags); | |
174 | } | |
971ddcf8 | 175 | EXPORT_SYMBOL(nvram_write_byte); |
1da177e4 | 176 | |
971ddcf8 | 177 | int __nvram_check_checksum(void) |
1da177e4 LT |
178 | { |
179 | return mach_check_checksum(); | |
180 | } | |
971ddcf8 | 181 | EXPORT_SYMBOL(__nvram_check_checksum); |
1da177e4 | 182 | |
971ddcf8 | 183 | int nvram_check_checksum(void) |
1da177e4 LT |
184 | { |
185 | unsigned long flags; | |
186 | int rv; | |
187 | ||
188 | spin_lock_irqsave(&rtc_lock, flags); | |
189 | rv = __nvram_check_checksum(); | |
190 | spin_unlock_irqrestore(&rtc_lock, flags); | |
191 | return rv; | |
192 | } | |
971ddcf8 | 193 | EXPORT_SYMBOL(nvram_check_checksum); |
1da177e4 | 194 | |
971ddcf8 | 195 | static void __nvram_set_checksum(void) |
1da177e4 LT |
196 | { |
197 | mach_set_checksum(); | |
198 | } | |
199 | ||
681ea4b9 | 200 | #if 0 |
971ddcf8 | 201 | void nvram_set_checksum(void) |
1da177e4 LT |
202 | { |
203 | unsigned long flags; | |
204 | ||
205 | spin_lock_irqsave(&rtc_lock, flags); | |
206 | __nvram_set_checksum(); | |
207 | spin_unlock_irqrestore(&rtc_lock, flags); | |
208 | } | |
681ea4b9 | 209 | #endif /* 0 */ |
1da177e4 LT |
210 | |
211 | /* | |
212 | * The are the file operation function for user access to /dev/nvram | |
213 | */ | |
214 | ||
971ddcf8 | 215 | static loff_t nvram_llseek(struct file *file, loff_t offset, int origin) |
1da177e4 | 216 | { |
1da177e4 LT |
217 | switch (origin) { |
218 | case 0: | |
219 | /* nothing to do */ | |
220 | break; | |
221 | case 1: | |
222 | offset += file->f_pos; | |
223 | break; | |
224 | case 2: | |
225 | offset += NVRAM_BYTES; | |
226 | break; | |
227 | } | |
9e8ab74d | 228 | |
1da177e4 LT |
229 | return (offset >= 0) ? (file->f_pos = offset) : -EINVAL; |
230 | } | |
231 | ||
971ddcf8 WVS |
232 | static ssize_t nvram_read(struct file *file, char __user *buf, |
233 | size_t count, loff_t *ppos) | |
1da177e4 LT |
234 | { |
235 | unsigned char contents[NVRAM_BYTES]; | |
236 | unsigned i = *ppos; | |
237 | unsigned char *tmp; | |
238 | ||
239 | spin_lock_irq(&rtc_lock); | |
240 | ||
241 | if (!__nvram_check_checksum()) | |
242 | goto checksum_err; | |
243 | ||
244 | for (tmp = contents; count-- > 0 && i < NVRAM_BYTES; ++i, ++tmp) | |
245 | *tmp = __nvram_read_byte(i); | |
246 | ||
247 | spin_unlock_irq(&rtc_lock); | |
248 | ||
249 | if (copy_to_user(buf, contents, tmp - contents)) | |
250 | return -EFAULT; | |
251 | ||
252 | *ppos = i; | |
253 | ||
254 | return tmp - contents; | |
255 | ||
971ddcf8 | 256 | checksum_err: |
1da177e4 LT |
257 | spin_unlock_irq(&rtc_lock); |
258 | return -EIO; | |
259 | } | |
260 | ||
971ddcf8 WVS |
261 | static ssize_t nvram_write(struct file *file, const char __user *buf, |
262 | size_t count, loff_t *ppos) | |
1da177e4 LT |
263 | { |
264 | unsigned char contents[NVRAM_BYTES]; | |
265 | unsigned i = *ppos; | |
266 | unsigned char *tmp; | |
1da177e4 | 267 | |
a01c7800 PA |
268 | if (i >= NVRAM_BYTES) |
269 | return 0; /* Past EOF */ | |
270 | ||
271 | if (count > NVRAM_BYTES - i) | |
272 | count = NVRAM_BYTES - i; | |
273 | if (count > NVRAM_BYTES) | |
274 | return -EFAULT; /* Can't happen, but prove it to gcc */ | |
275 | ||
276 | if (copy_from_user(contents, buf, count)) | |
1da177e4 LT |
277 | return -EFAULT; |
278 | ||
279 | spin_lock_irq(&rtc_lock); | |
280 | ||
281 | if (!__nvram_check_checksum()) | |
282 | goto checksum_err; | |
283 | ||
a01c7800 | 284 | for (tmp = contents; count--; ++i, ++tmp) |
1da177e4 LT |
285 | __nvram_write_byte(*tmp, i); |
286 | ||
287 | __nvram_set_checksum(); | |
288 | ||
289 | spin_unlock_irq(&rtc_lock); | |
290 | ||
291 | *ppos = i; | |
292 | ||
293 | return tmp - contents; | |
294 | ||
971ddcf8 | 295 | checksum_err: |
1da177e4 LT |
296 | spin_unlock_irq(&rtc_lock); |
297 | return -EIO; | |
298 | } | |
299 | ||
55929332 AB |
300 | static long nvram_ioctl(struct file *file, unsigned int cmd, |
301 | unsigned long arg) | |
1da177e4 LT |
302 | { |
303 | int i; | |
304 | ||
305 | switch (cmd) { | |
306 | ||
307 | case NVRAM_INIT: | |
308 | /* initialize NVRAM contents and checksum */ | |
309 | if (!capable(CAP_SYS_ADMIN)) | |
310 | return -EACCES; | |
311 | ||
613655fa | 312 | mutex_lock(&nvram_mutex); |
1da177e4 LT |
313 | spin_lock_irq(&rtc_lock); |
314 | ||
315 | for (i = 0; i < NVRAM_BYTES; ++i) | |
316 | __nvram_write_byte(0, i); | |
317 | __nvram_set_checksum(); | |
318 | ||
319 | spin_unlock_irq(&rtc_lock); | |
613655fa | 320 | mutex_unlock(&nvram_mutex); |
1da177e4 LT |
321 | return 0; |
322 | ||
323 | case NVRAM_SETCKS: | |
971ddcf8 | 324 | /* just set checksum, contents unchanged (maybe useful after |
1da177e4 LT |
325 | * checksum garbaged somehow...) */ |
326 | if (!capable(CAP_SYS_ADMIN)) | |
327 | return -EACCES; | |
328 | ||
613655fa | 329 | mutex_lock(&nvram_mutex); |
1da177e4 LT |
330 | spin_lock_irq(&rtc_lock); |
331 | __nvram_set_checksum(); | |
332 | spin_unlock_irq(&rtc_lock); | |
613655fa | 333 | mutex_unlock(&nvram_mutex); |
1da177e4 LT |
334 | return 0; |
335 | ||
336 | default: | |
337 | return -ENOTTY; | |
338 | } | |
339 | } | |
340 | ||
971ddcf8 | 341 | static int nvram_open(struct inode *inode, struct file *file) |
1da177e4 LT |
342 | { |
343 | spin_lock(&nvram_state_lock); | |
344 | ||
345 | if ((nvram_open_cnt && (file->f_flags & O_EXCL)) || | |
346 | (nvram_open_mode & NVRAM_EXCL) || | |
aeb5d727 | 347 | ((file->f_mode & FMODE_WRITE) && (nvram_open_mode & NVRAM_WRITE))) { |
1da177e4 LT |
348 | spin_unlock(&nvram_state_lock); |
349 | return -EBUSY; | |
350 | } | |
351 | ||
352 | if (file->f_flags & O_EXCL) | |
353 | nvram_open_mode |= NVRAM_EXCL; | |
aeb5d727 | 354 | if (file->f_mode & FMODE_WRITE) |
1da177e4 LT |
355 | nvram_open_mode |= NVRAM_WRITE; |
356 | nvram_open_cnt++; | |
357 | ||
358 | spin_unlock(&nvram_state_lock); | |
359 | ||
360 | return 0; | |
361 | } | |
362 | ||
971ddcf8 | 363 | static int nvram_release(struct inode *inode, struct file *file) |
1da177e4 LT |
364 | { |
365 | spin_lock(&nvram_state_lock); | |
366 | ||
367 | nvram_open_cnt--; | |
368 | ||
369 | /* if only one instance is open, clear the EXCL bit */ | |
370 | if (nvram_open_mode & NVRAM_EXCL) | |
371 | nvram_open_mode &= ~NVRAM_EXCL; | |
aeb5d727 | 372 | if (file->f_mode & FMODE_WRITE) |
1da177e4 LT |
373 | nvram_open_mode &= ~NVRAM_WRITE; |
374 | ||
375 | spin_unlock(&nvram_state_lock); | |
376 | ||
377 | return 0; | |
378 | } | |
379 | ||
380 | #ifndef CONFIG_PROC_FS | |
8587b33f | 381 | static int nvram_add_proc_fs(void) |
1da177e4 LT |
382 | { |
383 | return 0; | |
384 | } | |
8587b33f | 385 | |
1da177e4 LT |
386 | #else |
387 | ||
8587b33f | 388 | static int nvram_proc_read(struct seq_file *seq, void *offset) |
1da177e4 LT |
389 | { |
390 | unsigned char contents[NVRAM_BYTES]; | |
8587b33f | 391 | int i = 0; |
1da177e4 LT |
392 | |
393 | spin_lock_irq(&rtc_lock); | |
394 | for (i = 0; i < NVRAM_BYTES; ++i) | |
395 | contents[i] = __nvram_read_byte(i); | |
396 | spin_unlock_irq(&rtc_lock); | |
397 | ||
8587b33f | 398 | mach_proc_infos(contents, seq, offset); |
1da177e4 | 399 | |
8587b33f WVS |
400 | return 0; |
401 | } | |
1da177e4 | 402 | |
8587b33f WVS |
403 | static int nvram_proc_open(struct inode *inode, struct file *file) |
404 | { | |
405 | return single_open(file, nvram_proc_read, NULL); | |
1da177e4 LT |
406 | } |
407 | ||
8587b33f WVS |
408 | static const struct file_operations nvram_proc_fops = { |
409 | .owner = THIS_MODULE, | |
410 | .open = nvram_proc_open, | |
411 | .read = seq_read, | |
412 | .llseek = seq_lseek, | |
413 | .release = single_release, | |
414 | }; | |
415 | ||
416 | static int nvram_add_proc_fs(void) | |
417 | { | |
418 | if (!proc_create("driver/nvram", 0, NULL, &nvram_proc_fops)) | |
419 | return -ENOMEM; | |
420 | return 0; | |
421 | } | |
1da177e4 LT |
422 | |
423 | #endif /* CONFIG_PROC_FS */ | |
424 | ||
62322d25 | 425 | static const struct file_operations nvram_fops = { |
1da177e4 LT |
426 | .owner = THIS_MODULE, |
427 | .llseek = nvram_llseek, | |
428 | .read = nvram_read, | |
429 | .write = nvram_write, | |
55929332 | 430 | .unlocked_ioctl = nvram_ioctl, |
1da177e4 LT |
431 | .open = nvram_open, |
432 | .release = nvram_release, | |
433 | }; | |
434 | ||
435 | static struct miscdevice nvram_dev = { | |
436 | NVRAM_MINOR, | |
437 | "nvram", | |
438 | &nvram_fops | |
439 | }; | |
440 | ||
971ddcf8 | 441 | static int __init nvram_init(void) |
1da177e4 LT |
442 | { |
443 | int ret; | |
444 | ||
445 | /* First test whether the driver should init at all */ | |
446 | if (!CHECK_DRIVER_INIT()) | |
e945b568 | 447 | return -ENODEV; |
1da177e4 LT |
448 | |
449 | ret = misc_register(&nvram_dev); | |
450 | if (ret) { | |
451 | printk(KERN_ERR "nvram: can't misc_register on minor=%d\n", | |
452 | NVRAM_MINOR); | |
453 | goto out; | |
454 | } | |
8587b33f WVS |
455 | ret = nvram_add_proc_fs(); |
456 | if (ret) { | |
1da177e4 | 457 | printk(KERN_ERR "nvram: can't create /proc/driver/nvram\n"); |
1da177e4 LT |
458 | goto outmisc; |
459 | } | |
460 | ret = 0; | |
461 | printk(KERN_INFO "Non-volatile memory driver v" NVRAM_VERSION "\n"); | |
971ddcf8 | 462 | out: |
1da177e4 | 463 | return ret; |
971ddcf8 | 464 | outmisc: |
1da177e4 LT |
465 | misc_deregister(&nvram_dev); |
466 | goto out; | |
467 | } | |
468 | ||
971ddcf8 | 469 | static void __exit nvram_cleanup_module(void) |
1da177e4 LT |
470 | { |
471 | remove_proc_entry("driver/nvram", NULL); | |
472 | misc_deregister(&nvram_dev); | |
473 | } | |
474 | ||
475 | module_init(nvram_init); | |
476 | module_exit(nvram_cleanup_module); | |
477 | ||
478 | /* | |
479 | * Machine specific functions | |
480 | */ | |
481 | ||
482 | #if MACH == PC | |
483 | ||
971ddcf8 | 484 | static int pc_check_checksum(void) |
1da177e4 LT |
485 | { |
486 | int i; | |
487 | unsigned short sum = 0; | |
488 | unsigned short expect; | |
489 | ||
490 | for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i) | |
491 | sum += __nvram_read_byte(i); | |
492 | expect = __nvram_read_byte(PC_CKS_LOC)<<8 | | |
493 | __nvram_read_byte(PC_CKS_LOC+1); | |
971ddcf8 | 494 | return (sum & 0xffff) == expect; |
1da177e4 LT |
495 | } |
496 | ||
971ddcf8 | 497 | static void pc_set_checksum(void) |
1da177e4 LT |
498 | { |
499 | int i; | |
500 | unsigned short sum = 0; | |
501 | ||
502 | for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i) | |
503 | sum += __nvram_read_byte(i); | |
504 | __nvram_write_byte(sum >> 8, PC_CKS_LOC); | |
505 | __nvram_write_byte(sum & 0xff, PC_CKS_LOC + 1); | |
506 | } | |
507 | ||
508 | #ifdef CONFIG_PROC_FS | |
509 | ||
510 | static char *floppy_types[] = { | |
511 | "none", "5.25'' 360k", "5.25'' 1.2M", "3.5'' 720k", "3.5'' 1.44M", | |
512 | "3.5'' 2.88M", "3.5'' 2.88M" | |
513 | }; | |
514 | ||
515 | static char *gfx_types[] = { | |
516 | "EGA, VGA, ... (with BIOS)", | |
517 | "CGA (40 cols)", | |
518 | "CGA (80 cols)", | |
519 | "monochrome", | |
520 | }; | |
521 | ||
8587b33f WVS |
522 | static void pc_proc_infos(unsigned char *nvram, struct seq_file *seq, |
523 | void *offset) | |
1da177e4 LT |
524 | { |
525 | int checksum; | |
526 | int type; | |
527 | ||
528 | spin_lock_irq(&rtc_lock); | |
529 | checksum = __nvram_check_checksum(); | |
530 | spin_unlock_irq(&rtc_lock); | |
531 | ||
8587b33f | 532 | seq_printf(seq, "Checksum status: %svalid\n", checksum ? "" : "not "); |
1da177e4 | 533 | |
8587b33f | 534 | seq_printf(seq, "# floppies : %d\n", |
1da177e4 | 535 | (nvram[6] & 1) ? (nvram[6] >> 6) + 1 : 0); |
8587b33f | 536 | seq_printf(seq, "Floppy 0 type : "); |
1da177e4 | 537 | type = nvram[2] >> 4; |
fe971071 | 538 | if (type < ARRAY_SIZE(floppy_types)) |
8587b33f | 539 | seq_printf(seq, "%s\n", floppy_types[type]); |
1da177e4 | 540 | else |
8587b33f WVS |
541 | seq_printf(seq, "%d (unknown)\n", type); |
542 | seq_printf(seq, "Floppy 1 type : "); | |
1da177e4 | 543 | type = nvram[2] & 0x0f; |
fe971071 | 544 | if (type < ARRAY_SIZE(floppy_types)) |
8587b33f | 545 | seq_printf(seq, "%s\n", floppy_types[type]); |
1da177e4 | 546 | else |
8587b33f | 547 | seq_printf(seq, "%d (unknown)\n", type); |
1da177e4 | 548 | |
8587b33f | 549 | seq_printf(seq, "HD 0 type : "); |
1da177e4 LT |
550 | type = nvram[4] >> 4; |
551 | if (type) | |
8587b33f | 552 | seq_printf(seq, "%02x\n", type == 0x0f ? nvram[11] : type); |
1da177e4 | 553 | else |
8587b33f | 554 | seq_printf(seq, "none\n"); |
1da177e4 | 555 | |
8587b33f | 556 | seq_printf(seq, "HD 1 type : "); |
1da177e4 LT |
557 | type = nvram[4] & 0x0f; |
558 | if (type) | |
8587b33f | 559 | seq_printf(seq, "%02x\n", type == 0x0f ? nvram[12] : type); |
1da177e4 | 560 | else |
8587b33f | 561 | seq_printf(seq, "none\n"); |
1da177e4 | 562 | |
8587b33f | 563 | seq_printf(seq, "HD type 48 data: %d/%d/%d C/H/S, precomp %d, lz %d\n", |
1da177e4 LT |
564 | nvram[18] | (nvram[19] << 8), |
565 | nvram[20], nvram[25], | |
566 | nvram[21] | (nvram[22] << 8), nvram[23] | (nvram[24] << 8)); | |
8587b33f | 567 | seq_printf(seq, "HD type 49 data: %d/%d/%d C/H/S, precomp %d, lz %d\n", |
1da177e4 LT |
568 | nvram[39] | (nvram[40] << 8), |
569 | nvram[41], nvram[46], | |
570 | nvram[42] | (nvram[43] << 8), nvram[44] | (nvram[45] << 8)); | |
571 | ||
8587b33f WVS |
572 | seq_printf(seq, "DOS base memory: %d kB\n", nvram[7] | (nvram[8] << 8)); |
573 | seq_printf(seq, "Extended memory: %d kB (configured), %d kB (tested)\n", | |
1da177e4 LT |
574 | nvram[9] | (nvram[10] << 8), nvram[34] | (nvram[35] << 8)); |
575 | ||
8587b33f WVS |
576 | seq_printf(seq, "Gfx adapter : %s\n", |
577 | gfx_types[(nvram[6] >> 4) & 3]); | |
1da177e4 | 578 | |
8587b33f | 579 | seq_printf(seq, "FPU : %sinstalled\n", |
1da177e4 LT |
580 | (nvram[6] & 2) ? "" : "not "); |
581 | ||
8587b33f | 582 | return; |
1da177e4 LT |
583 | } |
584 | #endif | |
585 | ||
586 | #endif /* MACH == PC */ | |
587 | ||
1da177e4 LT |
588 | #if MACH == ATARI |
589 | ||
971ddcf8 | 590 | static int atari_check_checksum(void) |
1da177e4 LT |
591 | { |
592 | int i; | |
593 | unsigned char sum = 0; | |
594 | ||
595 | for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i) | |
596 | sum += __nvram_read_byte(i); | |
971ddcf8 WVS |
597 | return (__nvram_read_byte(ATARI_CKS_LOC) == (~sum & 0xff)) && |
598 | (__nvram_read_byte(ATARI_CKS_LOC + 1) == (sum & 0xff)); | |
1da177e4 LT |
599 | } |
600 | ||
971ddcf8 | 601 | static void atari_set_checksum(void) |
1da177e4 LT |
602 | { |
603 | int i; | |
604 | unsigned char sum = 0; | |
605 | ||
606 | for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i) | |
607 | sum += __nvram_read_byte(i); | |
608 | __nvram_write_byte(~sum, ATARI_CKS_LOC); | |
609 | __nvram_write_byte(sum, ATARI_CKS_LOC + 1); | |
610 | } | |
611 | ||
612 | #ifdef CONFIG_PROC_FS | |
613 | ||
614 | static struct { | |
615 | unsigned char val; | |
616 | char *name; | |
617 | } boot_prefs[] = { | |
618 | { 0x80, "TOS" }, | |
619 | { 0x40, "ASV" }, | |
620 | { 0x20, "NetBSD (?)" }, | |
621 | { 0x10, "Linux" }, | |
622 | { 0x00, "unspecified" } | |
623 | }; | |
624 | ||
625 | static char *languages[] = { | |
626 | "English (US)", | |
627 | "German", | |
628 | "French", | |
629 | "English (UK)", | |
630 | "Spanish", | |
631 | "Italian", | |
632 | "6 (undefined)", | |
633 | "Swiss (French)", | |
634 | "Swiss (German)" | |
635 | }; | |
636 | ||
637 | static char *dateformat[] = { | |
638 | "MM%cDD%cYY", | |
639 | "DD%cMM%cYY", | |
640 | "YY%cMM%cDD", | |
641 | "YY%cDD%cMM", | |
642 | "4 (undefined)", | |
643 | "5 (undefined)", | |
644 | "6 (undefined)", | |
645 | "7 (undefined)" | |
646 | }; | |
647 | ||
648 | static char *colors[] = { | |
649 | "2", "4", "16", "256", "65536", "??", "??", "??" | |
650 | }; | |
651 | ||
8587b33f WVS |
652 | static void atari_proc_infos(unsigned char *nvram, struct seq_file *seq, |
653 | void *offset) | |
1da177e4 LT |
654 | { |
655 | int checksum = nvram_check_checksum(); | |
656 | int i; | |
657 | unsigned vmode; | |
658 | ||
8587b33f | 659 | seq_printf(seq, "Checksum status : %svalid\n", checksum ? "" : "not "); |
1da177e4 | 660 | |
8587b33f | 661 | seq_printf(seq, "Boot preference : "); |
fe971071 | 662 | for (i = ARRAY_SIZE(boot_prefs) - 1; i >= 0; --i) { |
1da177e4 | 663 | if (nvram[1] == boot_prefs[i].val) { |
8587b33f | 664 | seq_printf(seq, "%s\n", boot_prefs[i].name); |
1da177e4 LT |
665 | break; |
666 | } | |
667 | } | |
668 | if (i < 0) | |
8587b33f | 669 | seq_printf(seq, "0x%02x (undefined)\n", nvram[1]); |
1da177e4 | 670 | |
8587b33f | 671 | seq_printf(seq, "SCSI arbitration : %s\n", |
1da177e4 | 672 | (nvram[16] & 0x80) ? "on" : "off"); |
8587b33f | 673 | seq_printf(seq, "SCSI host ID : "); |
1da177e4 | 674 | if (nvram[16] & 0x80) |
8587b33f | 675 | seq_printf(seq, "%d\n", nvram[16] & 7); |
1da177e4 | 676 | else |
8587b33f | 677 | seq_printf(seq, "n/a\n"); |
1da177e4 LT |
678 | |
679 | /* the following entries are defined only for the Falcon */ | |
680 | if ((atari_mch_cookie >> 16) != ATARI_MCH_FALCON) | |
8587b33f | 681 | return; |
1da177e4 | 682 | |
8587b33f | 683 | seq_printf(seq, "OS language : "); |
fe971071 | 684 | if (nvram[6] < ARRAY_SIZE(languages)) |
8587b33f | 685 | seq_printf(seq, "%s\n", languages[nvram[6]]); |
1da177e4 | 686 | else |
8587b33f WVS |
687 | seq_printf(seq, "%u (undefined)\n", nvram[6]); |
688 | seq_printf(seq, "Keyboard language: "); | |
fe971071 | 689 | if (nvram[7] < ARRAY_SIZE(languages)) |
8587b33f | 690 | seq_printf(seq, "%s\n", languages[nvram[7]]); |
1da177e4 | 691 | else |
8587b33f WVS |
692 | seq_printf(seq, "%u (undefined)\n", nvram[7]); |
693 | seq_printf(seq, "Date format : "); | |
694 | seq_printf(seq, dateformat[nvram[8] & 7], | |
1da177e4 | 695 | nvram[9] ? nvram[9] : '/', nvram[9] ? nvram[9] : '/'); |
8587b33f WVS |
696 | seq_printf(seq, ", %dh clock\n", nvram[8] & 16 ? 24 : 12); |
697 | seq_printf(seq, "Boot delay : "); | |
1da177e4 | 698 | if (nvram[10] == 0) |
8587b33f | 699 | seq_printf(seq, "default"); |
1da177e4 | 700 | else |
8587b33f | 701 | seq_printf(seq, "%ds%s\n", nvram[10], |
1da177e4 LT |
702 | nvram[10] < 8 ? ", no memory test" : ""); |
703 | ||
704 | vmode = (nvram[14] << 8) || nvram[15]; | |
8587b33f WVS |
705 | seq_printf(seq, |
706 | "Video mode : %s colors, %d columns, %s %s monitor\n", | |
1da177e4 LT |
707 | colors[vmode & 7], |
708 | vmode & 8 ? 80 : 40, | |
709 | vmode & 16 ? "VGA" : "TV", vmode & 32 ? "PAL" : "NTSC"); | |
8587b33f | 710 | seq_printf(seq, " %soverscan, compat. mode %s%s\n", |
1da177e4 LT |
711 | vmode & 64 ? "" : "no ", |
712 | vmode & 128 ? "on" : "off", | |
713 | vmode & 256 ? | |
714 | (vmode & 16 ? ", line doubling" : ", half screen") : ""); | |
715 | ||
8587b33f | 716 | return; |
1da177e4 LT |
717 | } |
718 | #endif | |
719 | ||
720 | #endif /* MACH == ATARI */ | |
721 | ||
722 | MODULE_LICENSE("GPL"); | |
1da177e4 | 723 | MODULE_ALIAS_MISCDEV(NVRAM_MINOR); |