blob: 66d2917b003f6361080e063323d88dca49fd623f [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
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>
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>
Frederic Weisbecker79a56ed2009-12-09 18:31:53 +0100112#include <linux/smp_lock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114#include <asm/system.h>
115
116static 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;
226 }
Frederic Weisbecker9e8ab742009-10-09 21:27:06 +0200227
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 return (offset >= 0) ? (file->f_pos = offset) : -EINVAL;
229}
230
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000231static ssize_t nvram_read(struct file *file, char __user *buf,
232 size_t count, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233{
234 unsigned char contents[NVRAM_BYTES];
235 unsigned i = *ppos;
236 unsigned char *tmp;
237
238 spin_lock_irq(&rtc_lock);
239
240 if (!__nvram_check_checksum())
241 goto checksum_err;
242
243 for (tmp = contents; count-- > 0 && i < NVRAM_BYTES; ++i, ++tmp)
244 *tmp = __nvram_read_byte(i);
245
246 spin_unlock_irq(&rtc_lock);
247
248 if (copy_to_user(buf, contents, tmp - contents))
249 return -EFAULT;
250
251 *ppos = i;
252
253 return tmp - contents;
254
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000255checksum_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 spin_unlock_irq(&rtc_lock);
257 return -EIO;
258}
259
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000260static ssize_t nvram_write(struct file *file, const char __user *buf,
261 size_t count, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262{
263 unsigned char contents[NVRAM_BYTES];
264 unsigned i = *ppos;
265 unsigned char *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
H. Peter Anvina01c7802009-12-11 15:48:23 -0800267 if (i >= NVRAM_BYTES)
268 return 0; /* Past EOF */
269
270 if (count > NVRAM_BYTES - i)
271 count = NVRAM_BYTES - i;
272 if (count > NVRAM_BYTES)
273 return -EFAULT; /* Can't happen, but prove it to gcc */
274
275 if (copy_from_user(contents, buf, count))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 return -EFAULT;
277
278 spin_lock_irq(&rtc_lock);
279
280 if (!__nvram_check_checksum())
281 goto checksum_err;
282
H. Peter Anvina01c7802009-12-11 15:48:23 -0800283 for (tmp = contents; count--; ++i, ++tmp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 __nvram_write_byte(*tmp, i);
285
286 __nvram_set_checksum();
287
288 spin_unlock_irq(&rtc_lock);
289
290 *ppos = i;
291
292 return tmp - contents;
293
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000294checksum_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 spin_unlock_irq(&rtc_lock);
296 return -EIO;
297}
298
Arnd Bergmann55929332010-04-27 00:24:05 +0200299static long nvram_ioctl(struct file *file, unsigned int cmd,
300 unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301{
302 int i;
303
304 switch (cmd) {
305
306 case NVRAM_INIT:
307 /* initialize NVRAM contents and checksum */
308 if (!capable(CAP_SYS_ADMIN))
309 return -EACCES;
310
Arnd Bergmann55929332010-04-27 00:24:05 +0200311 lock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 spin_lock_irq(&rtc_lock);
313
314 for (i = 0; i < NVRAM_BYTES; ++i)
315 __nvram_write_byte(0, i);
316 __nvram_set_checksum();
317
318 spin_unlock_irq(&rtc_lock);
Arnd Bergmann55929332010-04-27 00:24:05 +0200319 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 return 0;
321
322 case NVRAM_SETCKS:
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000323 /* just set checksum, contents unchanged (maybe useful after
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 * checksum garbaged somehow...) */
325 if (!capable(CAP_SYS_ADMIN))
326 return -EACCES;
327
Arnd Bergmann55929332010-04-27 00:24:05 +0200328 lock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 spin_lock_irq(&rtc_lock);
330 __nvram_set_checksum();
331 spin_unlock_irq(&rtc_lock);
Arnd Bergmann55929332010-04-27 00:24:05 +0200332 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 return 0;
334
335 default:
336 return -ENOTTY;
337 }
338}
339
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000340static int nvram_open(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341{
342 spin_lock(&nvram_state_lock);
343
344 if ((nvram_open_cnt && (file->f_flags & O_EXCL)) ||
345 (nvram_open_mode & NVRAM_EXCL) ||
Al Viroaeb5d722008-09-02 15:28:45 -0400346 ((file->f_mode & FMODE_WRITE) && (nvram_open_mode & NVRAM_WRITE))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 spin_unlock(&nvram_state_lock);
348 return -EBUSY;
349 }
350
351 if (file->f_flags & O_EXCL)
352 nvram_open_mode |= NVRAM_EXCL;
Al Viroaeb5d722008-09-02 15:28:45 -0400353 if (file->f_mode & FMODE_WRITE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 nvram_open_mode |= NVRAM_WRITE;
355 nvram_open_cnt++;
356
357 spin_unlock(&nvram_state_lock);
358
359 return 0;
360}
361
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000362static int nvram_release(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363{
364 spin_lock(&nvram_state_lock);
365
366 nvram_open_cnt--;
367
368 /* if only one instance is open, clear the EXCL bit */
369 if (nvram_open_mode & NVRAM_EXCL)
370 nvram_open_mode &= ~NVRAM_EXCL;
Al Viroaeb5d722008-09-02 15:28:45 -0400371 if (file->f_mode & FMODE_WRITE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 nvram_open_mode &= ~NVRAM_WRITE;
373
374 spin_unlock(&nvram_state_lock);
375
376 return 0;
377}
378
379#ifndef CONFIG_PROC_FS
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000380static int nvram_add_proc_fs(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381{
382 return 0;
383}
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000384
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385#else
386
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000387static int nvram_proc_read(struct seq_file *seq, void *offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388{
389 unsigned char contents[NVRAM_BYTES];
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000390 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391
392 spin_lock_irq(&rtc_lock);
393 for (i = 0; i < NVRAM_BYTES; ++i)
394 contents[i] = __nvram_read_byte(i);
395 spin_unlock_irq(&rtc_lock);
396
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000397 mach_proc_infos(contents, seq, offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000399 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400}
401
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000402static int nvram_proc_open(struct inode *inode, struct file *file)
403{
404 return single_open(file, nvram_proc_read, NULL);
405}
406
407static const struct file_operations nvram_proc_fops = {
408 .owner = THIS_MODULE,
409 .open = nvram_proc_open,
410 .read = seq_read,
411 .llseek = seq_lseek,
412 .release = single_release,
413};
414
415static int nvram_add_proc_fs(void)
416{
417 if (!proc_create("driver/nvram", 0, NULL, &nvram_proc_fops))
418 return -ENOMEM;
419 return 0;
420}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421
422#endif /* CONFIG_PROC_FS */
423
Arjan van de Ven62322d22006-07-03 00:24:21 -0700424static const struct file_operations nvram_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 .owner = THIS_MODULE,
426 .llseek = nvram_llseek,
427 .read = nvram_read,
428 .write = nvram_write,
Arnd Bergmann55929332010-04-27 00:24:05 +0200429 .unlocked_ioctl = nvram_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 .open = nvram_open,
431 .release = nvram_release,
432};
433
434static struct miscdevice nvram_dev = {
435 NVRAM_MINOR,
436 "nvram",
437 &nvram_fops
438};
439
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000440static int __init nvram_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441{
442 int ret;
443
444 /* First test whether the driver should init at all */
445 if (!CHECK_DRIVER_INIT())
Geert Uytterhoevene945b562008-07-17 21:16:10 +0200446 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447
448 ret = misc_register(&nvram_dev);
449 if (ret) {
450 printk(KERN_ERR "nvram: can't misc_register on minor=%d\n",
451 NVRAM_MINOR);
452 goto out;
453 }
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000454 ret = nvram_add_proc_fs();
455 if (ret) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 printk(KERN_ERR "nvram: can't create /proc/driver/nvram\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 goto outmisc;
458 }
459 ret = 0;
460 printk(KERN_INFO "Non-volatile memory driver v" NVRAM_VERSION "\n");
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000461out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 return ret;
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000463outmisc:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 misc_deregister(&nvram_dev);
465 goto out;
466}
467
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000468static void __exit nvram_cleanup_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469{
470 remove_proc_entry("driver/nvram", NULL);
471 misc_deregister(&nvram_dev);
472}
473
474module_init(nvram_init);
475module_exit(nvram_cleanup_module);
476
477/*
478 * Machine specific functions
479 */
480
481#if MACH == PC
482
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000483static int pc_check_checksum(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484{
485 int i;
486 unsigned short sum = 0;
487 unsigned short expect;
488
489 for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i)
490 sum += __nvram_read_byte(i);
491 expect = __nvram_read_byte(PC_CKS_LOC)<<8 |
492 __nvram_read_byte(PC_CKS_LOC+1);
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000493 return (sum & 0xffff) == expect;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494}
495
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000496static void pc_set_checksum(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497{
498 int i;
499 unsigned short sum = 0;
500
501 for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i)
502 sum += __nvram_read_byte(i);
503 __nvram_write_byte(sum >> 8, PC_CKS_LOC);
504 __nvram_write_byte(sum & 0xff, PC_CKS_LOC + 1);
505}
506
507#ifdef CONFIG_PROC_FS
508
509static char *floppy_types[] = {
510 "none", "5.25'' 360k", "5.25'' 1.2M", "3.5'' 720k", "3.5'' 1.44M",
511 "3.5'' 2.88M", "3.5'' 2.88M"
512};
513
514static char *gfx_types[] = {
515 "EGA, VGA, ... (with BIOS)",
516 "CGA (40 cols)",
517 "CGA (80 cols)",
518 "monochrome",
519};
520
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000521static void pc_proc_infos(unsigned char *nvram, struct seq_file *seq,
522 void *offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523{
524 int checksum;
525 int type;
526
527 spin_lock_irq(&rtc_lock);
528 checksum = __nvram_check_checksum();
529 spin_unlock_irq(&rtc_lock);
530
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000531 seq_printf(seq, "Checksum status: %svalid\n", checksum ? "" : "not ");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000533 seq_printf(seq, "# floppies : %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 (nvram[6] & 1) ? (nvram[6] >> 6) + 1 : 0);
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000535 seq_printf(seq, "Floppy 0 type : ");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 type = nvram[2] >> 4;
Tobias Klauserfe971072006-01-09 20:54:02 -0800537 if (type < ARRAY_SIZE(floppy_types))
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000538 seq_printf(seq, "%s\n", floppy_types[type]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 else
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000540 seq_printf(seq, "%d (unknown)\n", type);
541 seq_printf(seq, "Floppy 1 type : ");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 type = nvram[2] & 0x0f;
Tobias Klauserfe971072006-01-09 20:54:02 -0800543 if (type < ARRAY_SIZE(floppy_types))
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000544 seq_printf(seq, "%s\n", floppy_types[type]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 else
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000546 seq_printf(seq, "%d (unknown)\n", type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000548 seq_printf(seq, "HD 0 type : ");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 type = nvram[4] >> 4;
550 if (type)
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000551 seq_printf(seq, "%02x\n", type == 0x0f ? nvram[11] : type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 else
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000553 seq_printf(seq, "none\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000555 seq_printf(seq, "HD 1 type : ");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 type = nvram[4] & 0x0f;
557 if (type)
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000558 seq_printf(seq, "%02x\n", type == 0x0f ? nvram[12] : type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 else
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000560 seq_printf(seq, "none\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000562 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 -0700563 nvram[18] | (nvram[19] << 8),
564 nvram[20], nvram[25],
565 nvram[21] | (nvram[22] << 8), nvram[23] | (nvram[24] << 8));
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000566 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 -0700567 nvram[39] | (nvram[40] << 8),
568 nvram[41], nvram[46],
569 nvram[42] | (nvram[43] << 8), nvram[44] | (nvram[45] << 8));
570
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000571 seq_printf(seq, "DOS base memory: %d kB\n", nvram[7] | (nvram[8] << 8));
572 seq_printf(seq, "Extended memory: %d kB (configured), %d kB (tested)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 nvram[9] | (nvram[10] << 8), nvram[34] | (nvram[35] << 8));
574
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000575 seq_printf(seq, "Gfx adapter : %s\n",
576 gfx_types[(nvram[6] >> 4) & 3]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000578 seq_printf(seq, "FPU : %sinstalled\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 (nvram[6] & 2) ? "" : "not ");
580
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000581 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582}
583#endif
584
585#endif /* MACH == PC */
586
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587#if MACH == ATARI
588
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000589static int atari_check_checksum(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590{
591 int i;
592 unsigned char sum = 0;
593
594 for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i)
595 sum += __nvram_read_byte(i);
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000596 return (__nvram_read_byte(ATARI_CKS_LOC) == (~sum & 0xff)) &&
597 (__nvram_read_byte(ATARI_CKS_LOC + 1) == (sum & 0xff));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598}
599
Wim Van Sebroeck971ddcf2008-11-11 09:44:07 +0000600static void atari_set_checksum(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601{
602 int i;
603 unsigned char sum = 0;
604
605 for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i)
606 sum += __nvram_read_byte(i);
607 __nvram_write_byte(~sum, ATARI_CKS_LOC);
608 __nvram_write_byte(sum, ATARI_CKS_LOC + 1);
609}
610
611#ifdef CONFIG_PROC_FS
612
613static struct {
614 unsigned char val;
615 char *name;
616} boot_prefs[] = {
617 { 0x80, "TOS" },
618 { 0x40, "ASV" },
619 { 0x20, "NetBSD (?)" },
620 { 0x10, "Linux" },
621 { 0x00, "unspecified" }
622};
623
624static char *languages[] = {
625 "English (US)",
626 "German",
627 "French",
628 "English (UK)",
629 "Spanish",
630 "Italian",
631 "6 (undefined)",
632 "Swiss (French)",
633 "Swiss (German)"
634};
635
636static char *dateformat[] = {
637 "MM%cDD%cYY",
638 "DD%cMM%cYY",
639 "YY%cMM%cDD",
640 "YY%cDD%cMM",
641 "4 (undefined)",
642 "5 (undefined)",
643 "6 (undefined)",
644 "7 (undefined)"
645};
646
647static char *colors[] = {
648 "2", "4", "16", "256", "65536", "??", "??", "??"
649};
650
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000651static void atari_proc_infos(unsigned char *nvram, struct seq_file *seq,
652 void *offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653{
654 int checksum = nvram_check_checksum();
655 int i;
656 unsigned vmode;
657
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000658 seq_printf(seq, "Checksum status : %svalid\n", checksum ? "" : "not ");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000660 seq_printf(seq, "Boot preference : ");
Tobias Klauserfe971072006-01-09 20:54:02 -0800661 for (i = ARRAY_SIZE(boot_prefs) - 1; i >= 0; --i) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 if (nvram[1] == boot_prefs[i].val) {
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000663 seq_printf(seq, "%s\n", boot_prefs[i].name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 break;
665 }
666 }
667 if (i < 0)
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000668 seq_printf(seq, "0x%02x (undefined)\n", nvram[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000670 seq_printf(seq, "SCSI arbitration : %s\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 (nvram[16] & 0x80) ? "on" : "off");
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000672 seq_printf(seq, "SCSI host ID : ");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673 if (nvram[16] & 0x80)
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000674 seq_printf(seq, "%d\n", nvram[16] & 7);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 else
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000676 seq_printf(seq, "n/a\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677
678 /* the following entries are defined only for the Falcon */
679 if ((atari_mch_cookie >> 16) != ATARI_MCH_FALCON)
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000680 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000682 seq_printf(seq, "OS language : ");
Tobias Klauserfe971072006-01-09 20:54:02 -0800683 if (nvram[6] < ARRAY_SIZE(languages))
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000684 seq_printf(seq, "%s\n", languages[nvram[6]]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685 else
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000686 seq_printf(seq, "%u (undefined)\n", nvram[6]);
687 seq_printf(seq, "Keyboard language: ");
Tobias Klauserfe971072006-01-09 20:54:02 -0800688 if (nvram[7] < ARRAY_SIZE(languages))
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000689 seq_printf(seq, "%s\n", languages[nvram[7]]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 else
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000691 seq_printf(seq, "%u (undefined)\n", nvram[7]);
692 seq_printf(seq, "Date format : ");
693 seq_printf(seq, dateformat[nvram[8] & 7],
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 nvram[9] ? nvram[9] : '/', nvram[9] ? nvram[9] : '/');
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000695 seq_printf(seq, ", %dh clock\n", nvram[8] & 16 ? 24 : 12);
696 seq_printf(seq, "Boot delay : ");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697 if (nvram[10] == 0)
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000698 seq_printf(seq, "default");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 else
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000700 seq_printf(seq, "%ds%s\n", nvram[10],
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 nvram[10] < 8 ? ", no memory test" : "");
702
703 vmode = (nvram[14] << 8) || nvram[15];
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000704 seq_printf(seq,
705 "Video mode : %s colors, %d columns, %s %s monitor\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 colors[vmode & 7],
707 vmode & 8 ? 80 : 40,
708 vmode & 16 ? "VGA" : "TV", vmode & 32 ? "PAL" : "NTSC");
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000709 seq_printf(seq, " %soverscan, compat. mode %s%s\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 vmode & 64 ? "" : "no ",
711 vmode & 128 ? "on" : "off",
712 vmode & 256 ?
713 (vmode & 16 ? ", line doubling" : ", half screen") : "");
714
Wim Van Sebroeck8587b33f2008-11-11 09:56:00 +0000715 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716}
717#endif
718
719#endif /* MACH == ATARI */
720
721MODULE_LICENSE("GPL");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722MODULE_ALIAS_MISCDEV(NVRAM_MINOR);