blob: 01292328a45677d7da51e662c3c94dec2c5e970c [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>
Al Virob808b1d2015-12-05 21:39:06 -0500113#include <linux/pagemap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115
Arnd Bergmann613655f2010-06-02 14:28:52 +0200116static DEFINE_MUTEX(nvram_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117static DEFINE_SPINLOCK(nvram_state_lock);
118static int nvram_open_cnt; /* #times opened */
119static 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
123static int mach_check_checksum(void);
124static void mach_set_checksum(void);
125
126#ifdef CONFIG_PROC_FS
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000127static void mach_proc_infos(unsigned char *contents, struct seq_file *seq,
128 void *offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129#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
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000138 * NVRAM_FIRST_BYTE offset. Pass them offsets into NVRAM as if you did not
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 * know about the RTC cruft.
140 */
141
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000142unsigned char __nvram_read_byte(int i)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143{
144 return CMOS_READ(NVRAM_FIRST_BYTE + i);
145}
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000146EXPORT_SYMBOL(__nvram_read_byte);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000148unsigned char nvram_read_byte(int i)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149{
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}
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000158EXPORT_SYMBOL(nvram_read_byte);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
160/* This races nicely with trying to read with checksum checking (nvram_read) */
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000161void __nvram_write_byte(unsigned char c, int i)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162{
163 CMOS_WRITE(c, NVRAM_FIRST_BYTE + i);
164}
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000165EXPORT_SYMBOL(__nvram_write_byte);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000167void nvram_write_byte(unsigned char c, int i)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168{
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}
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000175EXPORT_SYMBOL(nvram_write_byte);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000177int __nvram_check_checksum(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178{
179 return mach_check_checksum();
180}
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000181EXPORT_SYMBOL(__nvram_check_checksum);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000183int nvram_check_checksum(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184{
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}
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000193EXPORT_SYMBOL(nvram_check_checksum);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000195static void __nvram_set_checksum(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196{
197 mach_set_checksum();
198}
199
Adrian Bunk681ea4b2005-06-25 14:59:04 -0700200#if 0
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000201void nvram_set_checksum(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202{
203 unsigned long flags;
204
205 spin_lock_irqsave(&rtc_lock, flags);
206 __nvram_set_checksum();
207 spin_unlock_irqrestore(&rtc_lock, flags);
208}
Adrian Bunk681ea4b2005-06-25 14:59:04 -0700209#endif /* 0 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210
211/*
212 * The are the file operation function for user access to /dev/nvram
213 */
214
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000215static loff_t nvram_llseek(struct file *file, loff_t offset, int origin)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216{
Al Virob808b1d2015-12-05 21:39:06 -0500217 return generic_file_llseek_size(file, offset, origin, MAX_LFS_FILESIZE,
218 NVRAM_BYTES);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219}
220
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000221static ssize_t nvram_read(struct file *file, char __user *buf,
222 size_t count, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223{
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
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000245checksum_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 spin_unlock_irq(&rtc_lock);
247 return -EIO;
248}
249
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000250static ssize_t nvram_write(struct file *file, const char __user *buf,
251 size_t count, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252{
253 unsigned char contents[NVRAM_BYTES];
254 unsigned i = *ppos;
255 unsigned char *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256
H. Peter Anvina01c7802009-12-11 15:48:23 -0800257 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))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 return -EFAULT;
267
268 spin_lock_irq(&rtc_lock);
269
270 if (!__nvram_check_checksum())
271 goto checksum_err;
272
H. Peter Anvina01c7802009-12-11 15:48:23 -0800273 for (tmp = contents; count--; ++i, ++tmp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 __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
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000284checksum_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 spin_unlock_irq(&rtc_lock);
286 return -EIO;
287}
288
Arnd Bergmann55929332010-04-27 00:24:05 +0200289static long nvram_ioctl(struct file *file, unsigned int cmd,
290 unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291{
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
Arnd Bergmann613655f2010-06-02 14:28:52 +0200301 mutex_lock(&nvram_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 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);
Arnd Bergmann613655f2010-06-02 14:28:52 +0200309 mutex_unlock(&nvram_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 return 0;
311
312 case NVRAM_SETCKS:
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000313 /* just set checksum, contents unchanged (maybe useful after
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 * checksum garbaged somehow...) */
315 if (!capable(CAP_SYS_ADMIN))
316 return -EACCES;
317
Arnd Bergmann613655f2010-06-02 14:28:52 +0200318 mutex_lock(&nvram_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 spin_lock_irq(&rtc_lock);
320 __nvram_set_checksum();
321 spin_unlock_irq(&rtc_lock);
Arnd Bergmann613655f2010-06-02 14:28:52 +0200322 mutex_unlock(&nvram_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 return 0;
324
325 default:
326 return -ENOTTY;
327 }
328}
329
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000330static int nvram_open(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331{
332 spin_lock(&nvram_state_lock);
333
334 if ((nvram_open_cnt && (file->f_flags & O_EXCL)) ||
335 (nvram_open_mode & NVRAM_EXCL) ||
Al Viroaeb5d722008-09-02 15:28:45 -0400336 ((file->f_mode & FMODE_WRITE) && (nvram_open_mode & NVRAM_WRITE))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 spin_unlock(&nvram_state_lock);
338 return -EBUSY;
339 }
340
341 if (file->f_flags & O_EXCL)
342 nvram_open_mode |= NVRAM_EXCL;
Al Viroaeb5d722008-09-02 15:28:45 -0400343 if (file->f_mode & FMODE_WRITE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 nvram_open_mode |= NVRAM_WRITE;
345 nvram_open_cnt++;
346
347 spin_unlock(&nvram_state_lock);
348
349 return 0;
350}
351
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000352static int nvram_release(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353{
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;
Al Viroaeb5d722008-09-02 15:28:45 -0400361 if (file->f_mode & FMODE_WRITE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 nvram_open_mode &= ~NVRAM_WRITE;
363
364 spin_unlock(&nvram_state_lock);
365
366 return 0;
367}
368
369#ifndef CONFIG_PROC_FS
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000370static int nvram_add_proc_fs(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371{
372 return 0;
373}
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000374
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375#else
376
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000377static int nvram_proc_read(struct seq_file *seq, void *offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378{
379 unsigned char contents[NVRAM_BYTES];
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000380 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381
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
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000387 mach_proc_infos(contents, seq, offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000389 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390}
391
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000392static int nvram_proc_open(struct inode *inode, struct file *file)
393{
394 return single_open(file, nvram_proc_read, NULL);
395}
396
397static 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
405static 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}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411
412#endif /* CONFIG_PROC_FS */
413
Arjan van de Ven62322d22006-07-03 00:24:21 -0700414static const struct file_operations nvram_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 .owner = THIS_MODULE,
416 .llseek = nvram_llseek,
417 .read = nvram_read,
418 .write = nvram_write,
Arnd Bergmann55929332010-04-27 00:24:05 +0200419 .unlocked_ioctl = nvram_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 .open = nvram_open,
421 .release = nvram_release,
422};
423
424static struct miscdevice nvram_dev = {
425 NVRAM_MINOR,
426 "nvram",
427 &nvram_fops
428};
429
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000430static int __init nvram_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431{
432 int ret;
433
434 /* First test whether the driver should init at all */
435 if (!CHECK_DRIVER_INIT())
Geert Uytterhoevene945b562008-07-17 21:16:10 +0200436 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437
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 }
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000444 ret = nvram_add_proc_fs();
445 if (ret) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 printk(KERN_ERR "nvram: can't create /proc/driver/nvram\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 goto outmisc;
448 }
449 ret = 0;
450 printk(KERN_INFO "Non-volatile memory driver v" NVRAM_VERSION "\n");
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000451out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 return ret;
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000453outmisc:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 misc_deregister(&nvram_dev);
455 goto out;
456}
457
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000458static void __exit nvram_cleanup_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459{
460 remove_proc_entry("driver/nvram", NULL);
461 misc_deregister(&nvram_dev);
462}
463
464module_init(nvram_init);
465module_exit(nvram_cleanup_module);
466
467/*
468 * Machine specific functions
469 */
470
471#if MACH == PC
472
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000473static int pc_check_checksum(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474{
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);
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000483 return (sum & 0xffff) == expect;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484}
485
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000486static void pc_set_checksum(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487{
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
499static char *floppy_types[] = {
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
504static char *gfx_types[] = {
505 "EGA, VGA, ... (with BIOS)",
506 "CGA (40 cols)",
507 "CGA (80 cols)",
508 "monochrome",
509};
510
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000511static void pc_proc_infos(unsigned char *nvram, struct seq_file *seq,
512 void *offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513{
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
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000521 seq_printf(seq, "Checksum status: %svalid\n", checksum ? "" : "not ");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000523 seq_printf(seq, "# floppies : %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 (nvram[6] & 1) ? (nvram[6] >> 6) + 1 : 0);
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000525 seq_printf(seq, "Floppy 0 type : ");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 type = nvram[2] >> 4;
Tobias Klauserfe971072006-01-09 20:54:02 -0800527 if (type < ARRAY_SIZE(floppy_types))
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000528 seq_printf(seq, "%s\n", floppy_types[type]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 else
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000530 seq_printf(seq, "%d (unknown)\n", type);
531 seq_printf(seq, "Floppy 1 type : ");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 type = nvram[2] & 0x0f;
Tobias Klauserfe971072006-01-09 20:54:02 -0800533 if (type < ARRAY_SIZE(floppy_types))
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000534 seq_printf(seq, "%s\n", floppy_types[type]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 else
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000536 seq_printf(seq, "%d (unknown)\n", type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000538 seq_printf(seq, "HD 0 type : ");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 type = nvram[4] >> 4;
540 if (type)
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000541 seq_printf(seq, "%02x\n", type == 0x0f ? nvram[11] : type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 else
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000543 seq_printf(seq, "none\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000545 seq_printf(seq, "HD 1 type : ");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 type = nvram[4] & 0x0f;
547 if (type)
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000548 seq_printf(seq, "%02x\n", type == 0x0f ? nvram[12] : type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 else
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000550 seq_printf(seq, "none\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000552 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 -0700553 nvram[18] | (nvram[19] << 8),
554 nvram[20], nvram[25],
555 nvram[21] | (nvram[22] << 8), nvram[23] | (nvram[24] << 8));
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000556 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 -0700557 nvram[39] | (nvram[40] << 8),
558 nvram[41], nvram[46],
559 nvram[42] | (nvram[43] << 8), nvram[44] | (nvram[45] << 8));
560
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000561 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",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 nvram[9] | (nvram[10] << 8), nvram[34] | (nvram[35] << 8));
564
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000565 seq_printf(seq, "Gfx adapter : %s\n",
566 gfx_types[(nvram[6] >> 4) & 3]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000568 seq_printf(seq, "FPU : %sinstalled\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 (nvram[6] & 2) ? "" : "not ");
570
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000571 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572}
573#endif
574
575#endif /* MACH == PC */
576
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577#if MACH == ATARI
578
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000579static int atari_check_checksum(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580{
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);
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000586 return (__nvram_read_byte(ATARI_CKS_LOC) == (~sum & 0xff)) &&
587 (__nvram_read_byte(ATARI_CKS_LOC + 1) == (sum & 0xff));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588}
589
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000590static void atari_set_checksum(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591{
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
603static struct {
604 unsigned char val;
605 char *name;
606} boot_prefs[] = {
607 { 0x80, "TOS" },
608 { 0x40, "ASV" },
609 { 0x20, "NetBSD (?)" },
610 { 0x10, "Linux" },
611 { 0x00, "unspecified" }
612};
613
614static char *languages[] = {
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
626static char *dateformat[] = {
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
637static char *colors[] = {
638 "2", "4", "16", "256", "65536", "??", "??", "??"
639};
640
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000641static void atari_proc_infos(unsigned char *nvram, struct seq_file *seq,
642 void *offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643{
644 int checksum = nvram_check_checksum();
645 int i;
646 unsigned vmode;
647
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000648 seq_printf(seq, "Checksum status : %svalid\n", checksum ? "" : "not ");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000650 seq_printf(seq, "Boot preference : ");
Tobias Klauserfe971072006-01-09 20:54:02 -0800651 for (i = ARRAY_SIZE(boot_prefs) - 1; i >= 0; --i) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 if (nvram[1] == boot_prefs[i].val) {
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000653 seq_printf(seq, "%s\n", boot_prefs[i].name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 break;
655 }
656 }
657 if (i < 0)
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000658 seq_printf(seq, "0x%02x (undefined)\n", nvram[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000660 seq_printf(seq, "SCSI arbitration : %s\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 (nvram[16] & 0x80) ? "on" : "off");
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000662 seq_printf(seq, "SCSI host ID : ");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 if (nvram[16] & 0x80)
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000664 seq_printf(seq, "%d\n", nvram[16] & 7);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 else
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000666 seq_printf(seq, "n/a\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667
668 /* the following entries are defined only for the Falcon */
669 if ((atari_mch_cookie >> 16) != ATARI_MCH_FALCON)
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000670 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000672 seq_printf(seq, "OS language : ");
Tobias Klauserfe971072006-01-09 20:54:02 -0800673 if (nvram[6] < ARRAY_SIZE(languages))
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000674 seq_printf(seq, "%s\n", languages[nvram[6]]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 else
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000676 seq_printf(seq, "%u (undefined)\n", nvram[6]);
677 seq_printf(seq, "Keyboard language: ");
Tobias Klauserfe971072006-01-09 20:54:02 -0800678 if (nvram[7] < ARRAY_SIZE(languages))
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000679 seq_printf(seq, "%s\n", languages[nvram[7]]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680 else
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000681 seq_printf(seq, "%u (undefined)\n", nvram[7]);
682 seq_printf(seq, "Date format : ");
683 seq_printf(seq, dateformat[nvram[8] & 7],
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684 nvram[9] ? nvram[9] : '/', nvram[9] ? nvram[9] : '/');
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000685 seq_printf(seq, ", %dh clock\n", nvram[8] & 16 ? 24 : 12);
686 seq_printf(seq, "Boot delay : ");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 if (nvram[10] == 0)
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000688 seq_printf(seq, "default");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689 else
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000690 seq_printf(seq, "%ds%s\n", nvram[10],
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691 nvram[10] < 8 ? ", no memory test" : "");
692
Finn Thaind25ded82015-07-03 13:35:36 +1000693 vmode = (nvram[14] << 8) | nvram[15];
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000694 seq_printf(seq,
695 "Video mode : %s colors, %d columns, %s %s monitor\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 colors[vmode & 7],
697 vmode & 8 ? 80 : 40,
698 vmode & 16 ? "VGA" : "TV", vmode & 32 ? "PAL" : "NTSC");
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000699 seq_printf(seq, " %soverscan, compat. mode %s%s\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 vmode & 64 ? "" : "no ",
701 vmode & 128 ? "on" : "off",
702 vmode & 256 ?
703 (vmode & 16 ? ", line doubling" : ", half screen") : "");
704
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000705 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706}
707#endif
708
709#endif /* MACH == ATARI */
710
711MODULE_LICENSE("GPL");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712MODULE_ALIAS_MISCDEV(NVRAM_MINOR);