blob: 97c2d8d433d6227f82f8524da27ecbd8929d9cd8 [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
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +000035 * 1.3 Wim Van Sebroeck: convert PRINT_PROC to seq_file
Linus Torvalds1da177e2005-04-16 15:20:36 -070036 */
37
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +000038#define NVRAM_VERSION "1.3"
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
40#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <linux/nvram.h>
42
43#define PC 1
44#define ATARI 2
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
46/* select machine configuration */
47#if defined(CONFIG_ATARI)
48# define MACH ATARI
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +000049#elif defined(__i386__) || defined(__x86_64__) || defined(__arm__) /* and ?? */
Robert P. J. Dayea5a3dcf2007-07-15 23:41:04 -070050# define MACH PC
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#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
Linus Torvalds1da177e2005-04-16 15:20:36 -070072#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
Michael Witten5196d202012-01-24 22:48:04 +000097 * periodic 11 min sync from kernel/time/ntp.c vs. this driver.)
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 */
99
100#include <linux/types.h>
101#include <linux/errno.h>
102#include <linux/miscdevice.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103#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>
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000108#include <linux/seq_file.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109#include <linux/spinlock.h>
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000110#include <linux/io.h>
111#include <linux/uaccess.h>
Arnd Bergmann613655f2010-06-02 14:28:52 +0200112#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
Arnd Bergmann613655f2010-06-02 14:28:52 +0200115static DEFINE_MUTEX(nvram_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116static DEFINE_SPINLOCK(nvram_state_lock);
117static int nvram_open_cnt; /* #times opened */
118static 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
122static int mach_check_checksum(void);
123static void mach_set_checksum(void);
124
125#ifdef CONFIG_PROC_FS
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000126static void mach_proc_infos(unsigned char *contents, struct seq_file *seq,
127 void *offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128#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
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000137 * NVRAM_FIRST_BYTE offset. Pass them offsets into NVRAM as if you did not
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 * know about the RTC cruft.
139 */
140
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000141unsigned char __nvram_read_byte(int i)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142{
143 return CMOS_READ(NVRAM_FIRST_BYTE + i);
144}
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000145EXPORT_SYMBOL(__nvram_read_byte);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000147unsigned char nvram_read_byte(int i)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148{
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}
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000157EXPORT_SYMBOL(nvram_read_byte);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
159/* This races nicely with trying to read with checksum checking (nvram_read) */
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000160void __nvram_write_byte(unsigned char c, int i)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161{
162 CMOS_WRITE(c, NVRAM_FIRST_BYTE + i);
163}
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000164EXPORT_SYMBOL(__nvram_write_byte);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000166void nvram_write_byte(unsigned char c, int i)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167{
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}
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000174EXPORT_SYMBOL(nvram_write_byte);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000176int __nvram_check_checksum(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177{
178 return mach_check_checksum();
179}
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000180EXPORT_SYMBOL(__nvram_check_checksum);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000182int nvram_check_checksum(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183{
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}
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000192EXPORT_SYMBOL(nvram_check_checksum);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000194static void __nvram_set_checksum(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195{
196 mach_set_checksum();
197}
198
Adrian Bunk681ea4b2005-06-25 14:59:04 -0700199#if 0
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000200void nvram_set_checksum(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201{
202 unsigned long flags;
203
204 spin_lock_irqsave(&rtc_lock, flags);
205 __nvram_set_checksum();
206 spin_unlock_irqrestore(&rtc_lock, flags);
207}
Adrian Bunk681ea4b2005-06-25 14:59:04 -0700208#endif /* 0 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209
210/*
211 * The are the file operation function for user access to /dev/nvram
212 */
213
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000214static loff_t nvram_llseek(struct file *file, loff_t offset, int origin)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 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;
Josef Bacik22735062011-07-18 13:21:39 -0400226 default:
227 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 }
Frederic Weisbecker9e8ab742009-10-09 21:27:06 +0200229
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 return (offset >= 0) ? (file->f_pos = offset) : -EINVAL;
231}
232
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000233static ssize_t nvram_read(struct file *file, char __user *buf,
234 size_t count, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235{
236 unsigned char contents[NVRAM_BYTES];
237 unsigned i = *ppos;
238 unsigned char *tmp;
239
240 spin_lock_irq(&rtc_lock);
241
242 if (!__nvram_check_checksum())
243 goto checksum_err;
244
245 for (tmp = contents; count-- > 0 && i < NVRAM_BYTES; ++i, ++tmp)
246 *tmp = __nvram_read_byte(i);
247
248 spin_unlock_irq(&rtc_lock);
249
250 if (copy_to_user(buf, contents, tmp - contents))
251 return -EFAULT;
252
253 *ppos = i;
254
255 return tmp - contents;
256
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000257checksum_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 spin_unlock_irq(&rtc_lock);
259 return -EIO;
260}
261
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000262static ssize_t nvram_write(struct file *file, const char __user *buf,
263 size_t count, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264{
265 unsigned char contents[NVRAM_BYTES];
266 unsigned i = *ppos;
267 unsigned char *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268
H. Peter Anvina01c7802009-12-11 15:48:23 -0800269 if (i >= NVRAM_BYTES)
270 return 0; /* Past EOF */
271
272 if (count > NVRAM_BYTES - i)
273 count = NVRAM_BYTES - i;
274 if (count > NVRAM_BYTES)
275 return -EFAULT; /* Can't happen, but prove it to gcc */
276
277 if (copy_from_user(contents, buf, count))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 return -EFAULT;
279
280 spin_lock_irq(&rtc_lock);
281
282 if (!__nvram_check_checksum())
283 goto checksum_err;
284
H. Peter Anvina01c7802009-12-11 15:48:23 -0800285 for (tmp = contents; count--; ++i, ++tmp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 __nvram_write_byte(*tmp, i);
287
288 __nvram_set_checksum();
289
290 spin_unlock_irq(&rtc_lock);
291
292 *ppos = i;
293
294 return tmp - contents;
295
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000296checksum_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 spin_unlock_irq(&rtc_lock);
298 return -EIO;
299}
300
Arnd Bergmann55929332010-04-27 00:24:05 +0200301static long nvram_ioctl(struct file *file, unsigned int cmd,
302 unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303{
304 int i;
305
306 switch (cmd) {
307
308 case NVRAM_INIT:
309 /* initialize NVRAM contents and checksum */
310 if (!capable(CAP_SYS_ADMIN))
311 return -EACCES;
312
Arnd Bergmann613655f2010-06-02 14:28:52 +0200313 mutex_lock(&nvram_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 spin_lock_irq(&rtc_lock);
315
316 for (i = 0; i < NVRAM_BYTES; ++i)
317 __nvram_write_byte(0, i);
318 __nvram_set_checksum();
319
320 spin_unlock_irq(&rtc_lock);
Arnd Bergmann613655f2010-06-02 14:28:52 +0200321 mutex_unlock(&nvram_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 return 0;
323
324 case NVRAM_SETCKS:
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000325 /* just set checksum, contents unchanged (maybe useful after
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 * checksum garbaged somehow...) */
327 if (!capable(CAP_SYS_ADMIN))
328 return -EACCES;
329
Arnd Bergmann613655f2010-06-02 14:28:52 +0200330 mutex_lock(&nvram_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 spin_lock_irq(&rtc_lock);
332 __nvram_set_checksum();
333 spin_unlock_irq(&rtc_lock);
Arnd Bergmann613655f2010-06-02 14:28:52 +0200334 mutex_unlock(&nvram_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 return 0;
336
337 default:
338 return -ENOTTY;
339 }
340}
341
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000342static int nvram_open(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343{
344 spin_lock(&nvram_state_lock);
345
346 if ((nvram_open_cnt && (file->f_flags & O_EXCL)) ||
347 (nvram_open_mode & NVRAM_EXCL) ||
Al Viroaeb5d722008-09-02 15:28:45 -0400348 ((file->f_mode & FMODE_WRITE) && (nvram_open_mode & NVRAM_WRITE))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 spin_unlock(&nvram_state_lock);
350 return -EBUSY;
351 }
352
353 if (file->f_flags & O_EXCL)
354 nvram_open_mode |= NVRAM_EXCL;
Al Viroaeb5d722008-09-02 15:28:45 -0400355 if (file->f_mode & FMODE_WRITE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 nvram_open_mode |= NVRAM_WRITE;
357 nvram_open_cnt++;
358
359 spin_unlock(&nvram_state_lock);
360
361 return 0;
362}
363
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000364static int nvram_release(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365{
366 spin_lock(&nvram_state_lock);
367
368 nvram_open_cnt--;
369
370 /* if only one instance is open, clear the EXCL bit */
371 if (nvram_open_mode & NVRAM_EXCL)
372 nvram_open_mode &= ~NVRAM_EXCL;
Al Viroaeb5d722008-09-02 15:28:45 -0400373 if (file->f_mode & FMODE_WRITE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 nvram_open_mode &= ~NVRAM_WRITE;
375
376 spin_unlock(&nvram_state_lock);
377
378 return 0;
379}
380
381#ifndef CONFIG_PROC_FS
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000382static int nvram_add_proc_fs(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383{
384 return 0;
385}
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000386
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387#else
388
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000389static int nvram_proc_read(struct seq_file *seq, void *offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390{
391 unsigned char contents[NVRAM_BYTES];
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000392 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
394 spin_lock_irq(&rtc_lock);
395 for (i = 0; i < NVRAM_BYTES; ++i)
396 contents[i] = __nvram_read_byte(i);
397 spin_unlock_irq(&rtc_lock);
398
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000399 mach_proc_infos(contents, seq, offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000401 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402}
403
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000404static int nvram_proc_open(struct inode *inode, struct file *file)
405{
406 return single_open(file, nvram_proc_read, NULL);
407}
408
409static const struct file_operations nvram_proc_fops = {
410 .owner = THIS_MODULE,
411 .open = nvram_proc_open,
412 .read = seq_read,
413 .llseek = seq_lseek,
414 .release = single_release,
415};
416
417static int nvram_add_proc_fs(void)
418{
419 if (!proc_create("driver/nvram", 0, NULL, &nvram_proc_fops))
420 return -ENOMEM;
421 return 0;
422}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423
424#endif /* CONFIG_PROC_FS */
425
Arjan van de Ven62322d22006-07-03 00:24:21 -0700426static const struct file_operations nvram_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 .owner = THIS_MODULE,
428 .llseek = nvram_llseek,
429 .read = nvram_read,
430 .write = nvram_write,
Arnd Bergmann55929332010-04-27 00:24:05 +0200431 .unlocked_ioctl = nvram_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 .open = nvram_open,
433 .release = nvram_release,
434};
435
436static struct miscdevice nvram_dev = {
437 NVRAM_MINOR,
438 "nvram",
439 &nvram_fops
440};
441
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000442static int __init nvram_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443{
444 int ret;
445
446 /* First test whether the driver should init at all */
447 if (!CHECK_DRIVER_INIT())
Geert Uytterhoevene945b562008-07-17 21:16:10 +0200448 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449
450 ret = misc_register(&nvram_dev);
451 if (ret) {
452 printk(KERN_ERR "nvram: can't misc_register on minor=%d\n",
453 NVRAM_MINOR);
454 goto out;
455 }
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000456 ret = nvram_add_proc_fs();
457 if (ret) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 printk(KERN_ERR "nvram: can't create /proc/driver/nvram\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 goto outmisc;
460 }
461 ret = 0;
462 printk(KERN_INFO "Non-volatile memory driver v" NVRAM_VERSION "\n");
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000463out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 return ret;
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000465outmisc:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 misc_deregister(&nvram_dev);
467 goto out;
468}
469
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000470static void __exit nvram_cleanup_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471{
472 remove_proc_entry("driver/nvram", NULL);
473 misc_deregister(&nvram_dev);
474}
475
476module_init(nvram_init);
477module_exit(nvram_cleanup_module);
478
479/*
480 * Machine specific functions
481 */
482
483#if MACH == PC
484
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000485static int pc_check_checksum(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486{
487 int i;
488 unsigned short sum = 0;
489 unsigned short expect;
490
491 for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i)
492 sum += __nvram_read_byte(i);
493 expect = __nvram_read_byte(PC_CKS_LOC)<<8 |
494 __nvram_read_byte(PC_CKS_LOC+1);
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000495 return (sum & 0xffff) == expect;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496}
497
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000498static void pc_set_checksum(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499{
500 int i;
501 unsigned short sum = 0;
502
503 for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i)
504 sum += __nvram_read_byte(i);
505 __nvram_write_byte(sum >> 8, PC_CKS_LOC);
506 __nvram_write_byte(sum & 0xff, PC_CKS_LOC + 1);
507}
508
509#ifdef CONFIG_PROC_FS
510
511static char *floppy_types[] = {
512 "none", "5.25'' 360k", "5.25'' 1.2M", "3.5'' 720k", "3.5'' 1.44M",
513 "3.5'' 2.88M", "3.5'' 2.88M"
514};
515
516static char *gfx_types[] = {
517 "EGA, VGA, ... (with BIOS)",
518 "CGA (40 cols)",
519 "CGA (80 cols)",
520 "monochrome",
521};
522
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000523static void pc_proc_infos(unsigned char *nvram, struct seq_file *seq,
524 void *offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525{
526 int checksum;
527 int type;
528
529 spin_lock_irq(&rtc_lock);
530 checksum = __nvram_check_checksum();
531 spin_unlock_irq(&rtc_lock);
532
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000533 seq_printf(seq, "Checksum status: %svalid\n", checksum ? "" : "not ");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000535 seq_printf(seq, "# floppies : %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 (nvram[6] & 1) ? (nvram[6] >> 6) + 1 : 0);
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000537 seq_printf(seq, "Floppy 0 type : ");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 type = nvram[2] >> 4;
Tobias Klauserfe971072006-01-09 20:54:02 -0800539 if (type < ARRAY_SIZE(floppy_types))
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000540 seq_printf(seq, "%s\n", floppy_types[type]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 else
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000542 seq_printf(seq, "%d (unknown)\n", type);
543 seq_printf(seq, "Floppy 1 type : ");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 type = nvram[2] & 0x0f;
Tobias Klauserfe971072006-01-09 20:54:02 -0800545 if (type < ARRAY_SIZE(floppy_types))
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000546 seq_printf(seq, "%s\n", floppy_types[type]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 else
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000548 seq_printf(seq, "%d (unknown)\n", type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000550 seq_printf(seq, "HD 0 type : ");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 type = nvram[4] >> 4;
552 if (type)
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000553 seq_printf(seq, "%02x\n", type == 0x0f ? nvram[11] : type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 else
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000555 seq_printf(seq, "none\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000557 seq_printf(seq, "HD 1 type : ");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 type = nvram[4] & 0x0f;
559 if (type)
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000560 seq_printf(seq, "%02x\n", type == 0x0f ? nvram[12] : type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 else
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000562 seq_printf(seq, "none\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000564 seq_printf(seq, "HD type 48 data: %d/%d/%d C/H/S, precomp %d, lz %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 nvram[18] | (nvram[19] << 8),
566 nvram[20], nvram[25],
567 nvram[21] | (nvram[22] << 8), nvram[23] | (nvram[24] << 8));
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000568 seq_printf(seq, "HD type 49 data: %d/%d/%d C/H/S, precomp %d, lz %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 nvram[39] | (nvram[40] << 8),
570 nvram[41], nvram[46],
571 nvram[42] | (nvram[43] << 8), nvram[44] | (nvram[45] << 8));
572
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000573 seq_printf(seq, "DOS base memory: %d kB\n", nvram[7] | (nvram[8] << 8));
574 seq_printf(seq, "Extended memory: %d kB (configured), %d kB (tested)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 nvram[9] | (nvram[10] << 8), nvram[34] | (nvram[35] << 8));
576
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000577 seq_printf(seq, "Gfx adapter : %s\n",
578 gfx_types[(nvram[6] >> 4) & 3]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000580 seq_printf(seq, "FPU : %sinstalled\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 (nvram[6] & 2) ? "" : "not ");
582
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000583 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584}
585#endif
586
587#endif /* MACH == PC */
588
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589#if MACH == ATARI
590
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000591static int atari_check_checksum(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592{
593 int i;
594 unsigned char sum = 0;
595
596 for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i)
597 sum += __nvram_read_byte(i);
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000598 return (__nvram_read_byte(ATARI_CKS_LOC) == (~sum & 0xff)) &&
599 (__nvram_read_byte(ATARI_CKS_LOC + 1) == (sum & 0xff));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600}
601
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000602static void atari_set_checksum(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603{
604 int i;
605 unsigned char sum = 0;
606
607 for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i)
608 sum += __nvram_read_byte(i);
609 __nvram_write_byte(~sum, ATARI_CKS_LOC);
610 __nvram_write_byte(sum, ATARI_CKS_LOC + 1);
611}
612
613#ifdef CONFIG_PROC_FS
614
615static struct {
616 unsigned char val;
617 char *name;
618} boot_prefs[] = {
619 { 0x80, "TOS" },
620 { 0x40, "ASV" },
621 { 0x20, "NetBSD (?)" },
622 { 0x10, "Linux" },
623 { 0x00, "unspecified" }
624};
625
626static char *languages[] = {
627 "English (US)",
628 "German",
629 "French",
630 "English (UK)",
631 "Spanish",
632 "Italian",
633 "6 (undefined)",
634 "Swiss (French)",
635 "Swiss (German)"
636};
637
638static char *dateformat[] = {
639 "MM%cDD%cYY",
640 "DD%cMM%cYY",
641 "YY%cMM%cDD",
642 "YY%cDD%cMM",
643 "4 (undefined)",
644 "5 (undefined)",
645 "6 (undefined)",
646 "7 (undefined)"
647};
648
649static char *colors[] = {
650 "2", "4", "16", "256", "65536", "??", "??", "??"
651};
652
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000653static void atari_proc_infos(unsigned char *nvram, struct seq_file *seq,
654 void *offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655{
656 int checksum = nvram_check_checksum();
657 int i;
658 unsigned vmode;
659
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000660 seq_printf(seq, "Checksum status : %svalid\n", checksum ? "" : "not ");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000662 seq_printf(seq, "Boot preference : ");
Tobias Klauserfe971072006-01-09 20:54:02 -0800663 for (i = ARRAY_SIZE(boot_prefs) - 1; i >= 0; --i) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 if (nvram[1] == boot_prefs[i].val) {
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000665 seq_printf(seq, "%s\n", boot_prefs[i].name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 break;
667 }
668 }
669 if (i < 0)
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000670 seq_printf(seq, "0x%02x (undefined)\n", nvram[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000672 seq_printf(seq, "SCSI arbitration : %s\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673 (nvram[16] & 0x80) ? "on" : "off");
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000674 seq_printf(seq, "SCSI host ID : ");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 if (nvram[16] & 0x80)
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000676 seq_printf(seq, "%d\n", nvram[16] & 7);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 else
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000678 seq_printf(seq, "n/a\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679
680 /* the following entries are defined only for the Falcon */
681 if ((atari_mch_cookie >> 16) != ATARI_MCH_FALCON)
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000682 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000684 seq_printf(seq, "OS language : ");
Tobias Klauserfe971072006-01-09 20:54:02 -0800685 if (nvram[6] < ARRAY_SIZE(languages))
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000686 seq_printf(seq, "%s\n", languages[nvram[6]]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 else
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000688 seq_printf(seq, "%u (undefined)\n", nvram[6]);
689 seq_printf(seq, "Keyboard language: ");
Tobias Klauserfe971072006-01-09 20:54:02 -0800690 if (nvram[7] < ARRAY_SIZE(languages))
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000691 seq_printf(seq, "%s\n", languages[nvram[7]]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692 else
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000693 seq_printf(seq, "%u (undefined)\n", nvram[7]);
694 seq_printf(seq, "Date format : ");
695 seq_printf(seq, dateformat[nvram[8] & 7],
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 nvram[9] ? nvram[9] : '/', nvram[9] ? nvram[9] : '/');
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000697 seq_printf(seq, ", %dh clock\n", nvram[8] & 16 ? 24 : 12);
698 seq_printf(seq, "Boot delay : ");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 if (nvram[10] == 0)
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000700 seq_printf(seq, "default");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 else
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000702 seq_printf(seq, "%ds%s\n", nvram[10],
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 nvram[10] < 8 ? ", no memory test" : "");
704
Finn Thaind25ded82015-07-03 13:35:36 +1000705 vmode = (nvram[14] << 8) | nvram[15];
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000706 seq_printf(seq,
707 "Video mode : %s colors, %d columns, %s %s monitor\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 colors[vmode & 7],
709 vmode & 8 ? 80 : 40,
710 vmode & 16 ? "VGA" : "TV", vmode & 32 ? "PAL" : "NTSC");
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000711 seq_printf(seq, " %soverscan, compat. mode %s%s\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 vmode & 64 ? "" : "no ",
713 vmode & 128 ? "on" : "off",
714 vmode & 256 ?
715 (vmode & 16 ? ", line doubling" : ", half screen") : "");
716
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000717 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718}
719#endif
720
721#endif /* MACH == ATARI */
722
723MODULE_LICENSE("GPL");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724MODULE_ALIAS_MISCDEV(NVRAM_MINOR);