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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 | |
5196d203 | 97 | * periodic 11 min sync from kernel/time/ntp.c vs. this driver.) |
1da177e4 LT |
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> |
b808b1d6 | 113 | #include <linux/pagemap.h> |
1da177e4 | 114 | |
1da177e4 | 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 | { |
b808b1d6 AV |
217 | return generic_file_llseek_size(file, offset, origin, MAX_LFS_FILESIZE, |
218 | NVRAM_BYTES); | |
1da177e4 LT |
219 | } |
220 | ||
971ddcf8 WVS |
221 | static ssize_t nvram_read(struct file *file, char __user *buf, |
222 | size_t count, loff_t *ppos) | |
1da177e4 LT |
223 | { |
224 | unsigned char contents[NVRAM_BYTES]; | |
225 | unsigned i = *ppos; | |
226 | unsigned char *tmp; | |
227 | ||
228 | spin_lock_irq(&rtc_lock); | |
229 | ||
230 | if (!__nvram_check_checksum()) | |
231 | goto checksum_err; | |
232 | ||
233 | for (tmp = contents; count-- > 0 && i < NVRAM_BYTES; ++i, ++tmp) | |
234 | *tmp = __nvram_read_byte(i); | |
235 | ||
236 | spin_unlock_irq(&rtc_lock); | |
237 | ||
238 | if (copy_to_user(buf, contents, tmp - contents)) | |
239 | return -EFAULT; | |
240 | ||
241 | *ppos = i; | |
242 | ||
243 | return tmp - contents; | |
244 | ||
971ddcf8 | 245 | checksum_err: |
1da177e4 LT |
246 | spin_unlock_irq(&rtc_lock); |
247 | return -EIO; | |
248 | } | |
249 | ||
971ddcf8 WVS |
250 | static ssize_t nvram_write(struct file *file, const char __user *buf, |
251 | size_t count, loff_t *ppos) | |
1da177e4 LT |
252 | { |
253 | unsigned char contents[NVRAM_BYTES]; | |
254 | unsigned i = *ppos; | |
255 | unsigned char *tmp; | |
1da177e4 | 256 | |
a01c7800 PA |
257 | if (i >= NVRAM_BYTES) |
258 | return 0; /* Past EOF */ | |
259 | ||
260 | if (count > NVRAM_BYTES - i) | |
261 | count = NVRAM_BYTES - i; | |
262 | if (count > NVRAM_BYTES) | |
263 | return -EFAULT; /* Can't happen, but prove it to gcc */ | |
264 | ||
265 | if (copy_from_user(contents, buf, count)) | |
1da177e4 LT |
266 | return -EFAULT; |
267 | ||
268 | spin_lock_irq(&rtc_lock); | |
269 | ||
270 | if (!__nvram_check_checksum()) | |
271 | goto checksum_err; | |
272 | ||
a01c7800 | 273 | for (tmp = contents; count--; ++i, ++tmp) |
1da177e4 LT |
274 | __nvram_write_byte(*tmp, i); |
275 | ||
276 | __nvram_set_checksum(); | |
277 | ||
278 | spin_unlock_irq(&rtc_lock); | |
279 | ||
280 | *ppos = i; | |
281 | ||
282 | return tmp - contents; | |
283 | ||
971ddcf8 | 284 | checksum_err: |
1da177e4 LT |
285 | spin_unlock_irq(&rtc_lock); |
286 | return -EIO; | |
287 | } | |
288 | ||
55929332 AB |
289 | static long nvram_ioctl(struct file *file, unsigned int cmd, |
290 | unsigned long arg) | |
1da177e4 LT |
291 | { |
292 | int i; | |
293 | ||
294 | switch (cmd) { | |
295 | ||
296 | case NVRAM_INIT: | |
297 | /* initialize NVRAM contents and checksum */ | |
298 | if (!capable(CAP_SYS_ADMIN)) | |
299 | return -EACCES; | |
300 | ||
613655fa | 301 | mutex_lock(&nvram_mutex); |
1da177e4 LT |
302 | spin_lock_irq(&rtc_lock); |
303 | ||
304 | for (i = 0; i < NVRAM_BYTES; ++i) | |
305 | __nvram_write_byte(0, i); | |
306 | __nvram_set_checksum(); | |
307 | ||
308 | spin_unlock_irq(&rtc_lock); | |
613655fa | 309 | mutex_unlock(&nvram_mutex); |
1da177e4 LT |
310 | return 0; |
311 | ||
312 | case NVRAM_SETCKS: | |
971ddcf8 | 313 | /* just set checksum, contents unchanged (maybe useful after |
1da177e4 LT |
314 | * checksum garbaged somehow...) */ |
315 | if (!capable(CAP_SYS_ADMIN)) | |
316 | return -EACCES; | |
317 | ||
613655fa | 318 | mutex_lock(&nvram_mutex); |
1da177e4 LT |
319 | spin_lock_irq(&rtc_lock); |
320 | __nvram_set_checksum(); | |
321 | spin_unlock_irq(&rtc_lock); | |
613655fa | 322 | mutex_unlock(&nvram_mutex); |
1da177e4 LT |
323 | return 0; |
324 | ||
325 | default: | |
326 | return -ENOTTY; | |
327 | } | |
328 | } | |
329 | ||
971ddcf8 | 330 | static int nvram_open(struct inode *inode, struct file *file) |
1da177e4 LT |
331 | { |
332 | spin_lock(&nvram_state_lock); | |
333 | ||
334 | if ((nvram_open_cnt && (file->f_flags & O_EXCL)) || | |
335 | (nvram_open_mode & NVRAM_EXCL) || | |
aeb5d727 | 336 | ((file->f_mode & FMODE_WRITE) && (nvram_open_mode & NVRAM_WRITE))) { |
1da177e4 LT |
337 | spin_unlock(&nvram_state_lock); |
338 | return -EBUSY; | |
339 | } | |
340 | ||
341 | if (file->f_flags & O_EXCL) | |
342 | nvram_open_mode |= NVRAM_EXCL; | |
aeb5d727 | 343 | if (file->f_mode & FMODE_WRITE) |
1da177e4 LT |
344 | nvram_open_mode |= NVRAM_WRITE; |
345 | nvram_open_cnt++; | |
346 | ||
347 | spin_unlock(&nvram_state_lock); | |
348 | ||
349 | return 0; | |
350 | } | |
351 | ||
971ddcf8 | 352 | static int nvram_release(struct inode *inode, struct file *file) |
1da177e4 LT |
353 | { |
354 | spin_lock(&nvram_state_lock); | |
355 | ||
356 | nvram_open_cnt--; | |
357 | ||
358 | /* if only one instance is open, clear the EXCL bit */ | |
359 | if (nvram_open_mode & NVRAM_EXCL) | |
360 | nvram_open_mode &= ~NVRAM_EXCL; | |
aeb5d727 | 361 | if (file->f_mode & FMODE_WRITE) |
1da177e4 LT |
362 | nvram_open_mode &= ~NVRAM_WRITE; |
363 | ||
364 | spin_unlock(&nvram_state_lock); | |
365 | ||
366 | return 0; | |
367 | } | |
368 | ||
369 | #ifndef CONFIG_PROC_FS | |
8587b33f | 370 | static int nvram_add_proc_fs(void) |
1da177e4 LT |
371 | { |
372 | return 0; | |
373 | } | |
8587b33f | 374 | |
1da177e4 LT |
375 | #else |
376 | ||
8587b33f | 377 | static int nvram_proc_read(struct seq_file *seq, void *offset) |
1da177e4 LT |
378 | { |
379 | unsigned char contents[NVRAM_BYTES]; | |
8587b33f | 380 | int i = 0; |
1da177e4 LT |
381 | |
382 | spin_lock_irq(&rtc_lock); | |
383 | for (i = 0; i < NVRAM_BYTES; ++i) | |
384 | contents[i] = __nvram_read_byte(i); | |
385 | spin_unlock_irq(&rtc_lock); | |
386 | ||
8587b33f | 387 | mach_proc_infos(contents, seq, offset); |
1da177e4 | 388 | |
8587b33f WVS |
389 | return 0; |
390 | } | |
1da177e4 | 391 | |
8587b33f WVS |
392 | static int nvram_proc_open(struct inode *inode, struct file *file) |
393 | { | |
394 | return single_open(file, nvram_proc_read, NULL); | |
1da177e4 LT |
395 | } |
396 | ||
8587b33f WVS |
397 | static const struct file_operations nvram_proc_fops = { |
398 | .owner = THIS_MODULE, | |
399 | .open = nvram_proc_open, | |
400 | .read = seq_read, | |
401 | .llseek = seq_lseek, | |
402 | .release = single_release, | |
403 | }; | |
404 | ||
405 | static int nvram_add_proc_fs(void) | |
406 | { | |
407 | if (!proc_create("driver/nvram", 0, NULL, &nvram_proc_fops)) | |
408 | return -ENOMEM; | |
409 | return 0; | |
410 | } | |
1da177e4 LT |
411 | |
412 | #endif /* CONFIG_PROC_FS */ | |
413 | ||
62322d25 | 414 | static const struct file_operations nvram_fops = { |
1da177e4 LT |
415 | .owner = THIS_MODULE, |
416 | .llseek = nvram_llseek, | |
417 | .read = nvram_read, | |
418 | .write = nvram_write, | |
55929332 | 419 | .unlocked_ioctl = nvram_ioctl, |
1da177e4 LT |
420 | .open = nvram_open, |
421 | .release = nvram_release, | |
422 | }; | |
423 | ||
424 | static struct miscdevice nvram_dev = { | |
425 | NVRAM_MINOR, | |
426 | "nvram", | |
427 | &nvram_fops | |
428 | }; | |
429 | ||
971ddcf8 | 430 | static int __init nvram_init(void) |
1da177e4 LT |
431 | { |
432 | int ret; | |
433 | ||
434 | /* First test whether the driver should init at all */ | |
435 | if (!CHECK_DRIVER_INIT()) | |
e945b568 | 436 | return -ENODEV; |
1da177e4 LT |
437 | |
438 | ret = misc_register(&nvram_dev); | |
439 | if (ret) { | |
440 | printk(KERN_ERR "nvram: can't misc_register on minor=%d\n", | |
441 | NVRAM_MINOR); | |
442 | goto out; | |
443 | } | |
8587b33f WVS |
444 | ret = nvram_add_proc_fs(); |
445 | if (ret) { | |
1da177e4 | 446 | printk(KERN_ERR "nvram: can't create /proc/driver/nvram\n"); |
1da177e4 LT |
447 | goto outmisc; |
448 | } | |
449 | ret = 0; | |
450 | printk(KERN_INFO "Non-volatile memory driver v" NVRAM_VERSION "\n"); | |
971ddcf8 | 451 | out: |
1da177e4 | 452 | return ret; |
971ddcf8 | 453 | outmisc: |
1da177e4 LT |
454 | misc_deregister(&nvram_dev); |
455 | goto out; | |
456 | } | |
457 | ||
971ddcf8 | 458 | static void __exit nvram_cleanup_module(void) |
1da177e4 LT |
459 | { |
460 | remove_proc_entry("driver/nvram", NULL); | |
461 | misc_deregister(&nvram_dev); | |
462 | } | |
463 | ||
464 | module_init(nvram_init); | |
465 | module_exit(nvram_cleanup_module); | |
466 | ||
467 | /* | |
468 | * Machine specific functions | |
469 | */ | |
470 | ||
471 | #if MACH == PC | |
472 | ||
971ddcf8 | 473 | static int pc_check_checksum(void) |
1da177e4 LT |
474 | { |
475 | int i; | |
476 | unsigned short sum = 0; | |
477 | unsigned short expect; | |
478 | ||
479 | for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i) | |
480 | sum += __nvram_read_byte(i); | |
481 | expect = __nvram_read_byte(PC_CKS_LOC)<<8 | | |
482 | __nvram_read_byte(PC_CKS_LOC+1); | |
971ddcf8 | 483 | return (sum & 0xffff) == expect; |
1da177e4 LT |
484 | } |
485 | ||
971ddcf8 | 486 | static void pc_set_checksum(void) |
1da177e4 LT |
487 | { |
488 | int i; | |
489 | unsigned short sum = 0; | |
490 | ||
491 | for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i) | |
492 | sum += __nvram_read_byte(i); | |
493 | __nvram_write_byte(sum >> 8, PC_CKS_LOC); | |
494 | __nvram_write_byte(sum & 0xff, PC_CKS_LOC + 1); | |
495 | } | |
496 | ||
497 | #ifdef CONFIG_PROC_FS | |
498 | ||
a116eaf1 | 499 | static const char * const floppy_types[] = { |
1da177e4 LT |
500 | "none", "5.25'' 360k", "5.25'' 1.2M", "3.5'' 720k", "3.5'' 1.44M", |
501 | "3.5'' 2.88M", "3.5'' 2.88M" | |
502 | }; | |
503 | ||
a116eaf1 | 504 | static const char * const gfx_types[] = { |
1da177e4 LT |
505 | "EGA, VGA, ... (with BIOS)", |
506 | "CGA (40 cols)", | |
507 | "CGA (80 cols)", | |
508 | "monochrome", | |
509 | }; | |
510 | ||
8587b33f WVS |
511 | static void pc_proc_infos(unsigned char *nvram, struct seq_file *seq, |
512 | void *offset) | |
1da177e4 LT |
513 | { |
514 | int checksum; | |
515 | int type; | |
516 | ||
517 | spin_lock_irq(&rtc_lock); | |
518 | checksum = __nvram_check_checksum(); | |
519 | spin_unlock_irq(&rtc_lock); | |
520 | ||
8587b33f | 521 | seq_printf(seq, "Checksum status: %svalid\n", checksum ? "" : "not "); |
1da177e4 | 522 | |
8587b33f | 523 | seq_printf(seq, "# floppies : %d\n", |
1da177e4 | 524 | (nvram[6] & 1) ? (nvram[6] >> 6) + 1 : 0); |
8587b33f | 525 | seq_printf(seq, "Floppy 0 type : "); |
1da177e4 | 526 | type = nvram[2] >> 4; |
fe971071 | 527 | if (type < ARRAY_SIZE(floppy_types)) |
8587b33f | 528 | seq_printf(seq, "%s\n", floppy_types[type]); |
1da177e4 | 529 | else |
8587b33f WVS |
530 | seq_printf(seq, "%d (unknown)\n", type); |
531 | seq_printf(seq, "Floppy 1 type : "); | |
1da177e4 | 532 | type = nvram[2] & 0x0f; |
fe971071 | 533 | if (type < ARRAY_SIZE(floppy_types)) |
8587b33f | 534 | seq_printf(seq, "%s\n", floppy_types[type]); |
1da177e4 | 535 | else |
8587b33f | 536 | seq_printf(seq, "%d (unknown)\n", type); |
1da177e4 | 537 | |
8587b33f | 538 | seq_printf(seq, "HD 0 type : "); |
1da177e4 LT |
539 | type = nvram[4] >> 4; |
540 | if (type) | |
8587b33f | 541 | seq_printf(seq, "%02x\n", type == 0x0f ? nvram[11] : type); |
1da177e4 | 542 | else |
8587b33f | 543 | seq_printf(seq, "none\n"); |
1da177e4 | 544 | |
8587b33f | 545 | seq_printf(seq, "HD 1 type : "); |
1da177e4 LT |
546 | type = nvram[4] & 0x0f; |
547 | if (type) | |
8587b33f | 548 | seq_printf(seq, "%02x\n", type == 0x0f ? nvram[12] : type); |
1da177e4 | 549 | else |
8587b33f | 550 | seq_printf(seq, "none\n"); |
1da177e4 | 551 | |
8587b33f | 552 | seq_printf(seq, "HD type 48 data: %d/%d/%d C/H/S, precomp %d, lz %d\n", |
1da177e4 LT |
553 | nvram[18] | (nvram[19] << 8), |
554 | nvram[20], nvram[25], | |
555 | nvram[21] | (nvram[22] << 8), nvram[23] | (nvram[24] << 8)); | |
8587b33f | 556 | seq_printf(seq, "HD type 49 data: %d/%d/%d C/H/S, precomp %d, lz %d\n", |
1da177e4 LT |
557 | nvram[39] | (nvram[40] << 8), |
558 | nvram[41], nvram[46], | |
559 | nvram[42] | (nvram[43] << 8), nvram[44] | (nvram[45] << 8)); | |
560 | ||
8587b33f WVS |
561 | seq_printf(seq, "DOS base memory: %d kB\n", nvram[7] | (nvram[8] << 8)); |
562 | seq_printf(seq, "Extended memory: %d kB (configured), %d kB (tested)\n", | |
1da177e4 LT |
563 | nvram[9] | (nvram[10] << 8), nvram[34] | (nvram[35] << 8)); |
564 | ||
8587b33f WVS |
565 | seq_printf(seq, "Gfx adapter : %s\n", |
566 | gfx_types[(nvram[6] >> 4) & 3]); | |
1da177e4 | 567 | |
8587b33f | 568 | seq_printf(seq, "FPU : %sinstalled\n", |
1da177e4 LT |
569 | (nvram[6] & 2) ? "" : "not "); |
570 | ||
8587b33f | 571 | return; |
1da177e4 LT |
572 | } |
573 | #endif | |
574 | ||
575 | #endif /* MACH == PC */ | |
576 | ||
1da177e4 LT |
577 | #if MACH == ATARI |
578 | ||
971ddcf8 | 579 | static int atari_check_checksum(void) |
1da177e4 LT |
580 | { |
581 | int i; | |
582 | unsigned char sum = 0; | |
583 | ||
584 | for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i) | |
585 | sum += __nvram_read_byte(i); | |
971ddcf8 WVS |
586 | return (__nvram_read_byte(ATARI_CKS_LOC) == (~sum & 0xff)) && |
587 | (__nvram_read_byte(ATARI_CKS_LOC + 1) == (sum & 0xff)); | |
1da177e4 LT |
588 | } |
589 | ||
971ddcf8 | 590 | static void atari_set_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); | |
597 | __nvram_write_byte(~sum, ATARI_CKS_LOC); | |
598 | __nvram_write_byte(sum, ATARI_CKS_LOC + 1); | |
599 | } | |
600 | ||
601 | #ifdef CONFIG_PROC_FS | |
602 | ||
603 | static struct { | |
604 | unsigned char val; | |
a116eaf1 | 605 | const char *name; |
1da177e4 LT |
606 | } boot_prefs[] = { |
607 | { 0x80, "TOS" }, | |
608 | { 0x40, "ASV" }, | |
609 | { 0x20, "NetBSD (?)" }, | |
610 | { 0x10, "Linux" }, | |
611 | { 0x00, "unspecified" } | |
612 | }; | |
613 | ||
a116eaf1 | 614 | static const char * const languages[] = { |
1da177e4 LT |
615 | "English (US)", |
616 | "German", | |
617 | "French", | |
618 | "English (UK)", | |
619 | "Spanish", | |
620 | "Italian", | |
621 | "6 (undefined)", | |
622 | "Swiss (French)", | |
623 | "Swiss (German)" | |
624 | }; | |
625 | ||
a116eaf1 | 626 | static const char * const dateformat[] = { |
1da177e4 LT |
627 | "MM%cDD%cYY", |
628 | "DD%cMM%cYY", | |
629 | "YY%cMM%cDD", | |
630 | "YY%cDD%cMM", | |
631 | "4 (undefined)", | |
632 | "5 (undefined)", | |
633 | "6 (undefined)", | |
634 | "7 (undefined)" | |
635 | }; | |
636 | ||
a116eaf1 | 637 | static const char * const colors[] = { |
1da177e4 LT |
638 | "2", "4", "16", "256", "65536", "??", "??", "??" |
639 | }; | |
640 | ||
8587b33f WVS |
641 | static void atari_proc_infos(unsigned char *nvram, struct seq_file *seq, |
642 | void *offset) | |
1da177e4 LT |
643 | { |
644 | int checksum = nvram_check_checksum(); | |
645 | int i; | |
646 | unsigned vmode; | |
647 | ||
8587b33f | 648 | seq_printf(seq, "Checksum status : %svalid\n", checksum ? "" : "not "); |
1da177e4 | 649 | |
8587b33f | 650 | seq_printf(seq, "Boot preference : "); |
fe971071 | 651 | for (i = ARRAY_SIZE(boot_prefs) - 1; i >= 0; --i) { |
1da177e4 | 652 | if (nvram[1] == boot_prefs[i].val) { |
8587b33f | 653 | seq_printf(seq, "%s\n", boot_prefs[i].name); |
1da177e4 LT |
654 | break; |
655 | } | |
656 | } | |
657 | if (i < 0) | |
8587b33f | 658 | seq_printf(seq, "0x%02x (undefined)\n", nvram[1]); |
1da177e4 | 659 | |
8587b33f | 660 | seq_printf(seq, "SCSI arbitration : %s\n", |
1da177e4 | 661 | (nvram[16] & 0x80) ? "on" : "off"); |
8587b33f | 662 | seq_printf(seq, "SCSI host ID : "); |
1da177e4 | 663 | if (nvram[16] & 0x80) |
8587b33f | 664 | seq_printf(seq, "%d\n", nvram[16] & 7); |
1da177e4 | 665 | else |
8587b33f | 666 | seq_printf(seq, "n/a\n"); |
1da177e4 LT |
667 | |
668 | /* the following entries are defined only for the Falcon */ | |
669 | if ((atari_mch_cookie >> 16) != ATARI_MCH_FALCON) | |
8587b33f | 670 | return; |
1da177e4 | 671 | |
8587b33f | 672 | seq_printf(seq, "OS language : "); |
fe971071 | 673 | if (nvram[6] < ARRAY_SIZE(languages)) |
8587b33f | 674 | seq_printf(seq, "%s\n", languages[nvram[6]]); |
1da177e4 | 675 | else |
8587b33f WVS |
676 | seq_printf(seq, "%u (undefined)\n", nvram[6]); |
677 | seq_printf(seq, "Keyboard language: "); | |
fe971071 | 678 | if (nvram[7] < ARRAY_SIZE(languages)) |
8587b33f | 679 | seq_printf(seq, "%s\n", languages[nvram[7]]); |
1da177e4 | 680 | else |
8587b33f WVS |
681 | seq_printf(seq, "%u (undefined)\n", nvram[7]); |
682 | seq_printf(seq, "Date format : "); | |
683 | seq_printf(seq, dateformat[nvram[8] & 7], | |
1da177e4 | 684 | nvram[9] ? nvram[9] : '/', nvram[9] ? nvram[9] : '/'); |
8587b33f WVS |
685 | seq_printf(seq, ", %dh clock\n", nvram[8] & 16 ? 24 : 12); |
686 | seq_printf(seq, "Boot delay : "); | |
1da177e4 | 687 | if (nvram[10] == 0) |
8587b33f | 688 | seq_printf(seq, "default"); |
1da177e4 | 689 | else |
8587b33f | 690 | seq_printf(seq, "%ds%s\n", nvram[10], |
1da177e4 LT |
691 | nvram[10] < 8 ? ", no memory test" : ""); |
692 | ||
d25ded8d | 693 | vmode = (nvram[14] << 8) | nvram[15]; |
8587b33f WVS |
694 | seq_printf(seq, |
695 | "Video mode : %s colors, %d columns, %s %s monitor\n", | |
1da177e4 LT |
696 | colors[vmode & 7], |
697 | vmode & 8 ? 80 : 40, | |
698 | vmode & 16 ? "VGA" : "TV", vmode & 32 ? "PAL" : "NTSC"); | |
8587b33f | 699 | seq_printf(seq, " %soverscan, compat. mode %s%s\n", |
1da177e4 LT |
700 | vmode & 64 ? "" : "no ", |
701 | vmode & 128 ? "on" : "off", | |
702 | vmode & 256 ? | |
703 | (vmode & 16 ? ", line doubling" : ", half screen") : ""); | |
704 | ||
8587b33f | 705 | return; |
1da177e4 LT |
706 | } |
707 | #endif | |
708 | ||
709 | #endif /* MACH == ATARI */ | |
710 | ||
711 | MODULE_LICENSE("GPL"); | |
1da177e4 | 712 | MODULE_ALIAS_MISCDEV(NVRAM_MINOR); |