Root/drivers/char/nvram.c

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
35 * 1.3 Wim Van Sebroeck: convert PRINT_PROC to seq_file
36 */
37
38#define NVRAM_VERSION "1.3"
39
40#include <linux/module.h>
41#include <linux/nvram.h>
42
43#define PC 1
44#define ATARI 2
45
46/* select machine configuration */
47#if defined(CONFIG_ATARI)
48# define MACH ATARI
49#elif defined(__i386__) || defined(__x86_64__) || defined(__arm__) /* and ?? */
50# define MACH PC
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
72#if MACH == ATARI
73
74/* Special parameters for RTC in Atari machines */
75#include <asm/atarihw.h>
76#include <asm/atariints.h>
77#define RTC_PORT(x) (TT_RTC_BAS + 2*(x))
78#define CHECK_DRIVER_INIT() (MACH_IS_ATARI && ATARIHW_PRESENT(TT_CLK))
79
80#define NVRAM_BYTES 50
81
82/* On Ataris, the checksum is over all bytes except the checksum bytes
83 * themselves; these are at the very end */
84#define ATARI_CKS_RANGE_START 0
85#define ATARI_CKS_RANGE_END 47
86#define ATARI_CKS_LOC 48
87
88#define mach_check_checksum atari_check_checksum
89#define mach_set_checksum atari_set_checksum
90#define mach_proc_infos atari_proc_infos
91
92#endif
93
94/* Note that *all* calls to CMOS_READ and CMOS_WRITE must be done with
95 * rtc_lock held. Due to the index-port/data-port design of the RTC, we
96 * don't want two different things trying to get to it at once. (e.g. the
97 * periodic 11 min sync from kernel/time/ntp.c vs. this driver.)
98 */
99
100#include <linux/types.h>
101#include <linux/errno.h>
102#include <linux/miscdevice.h>
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>
108#include <linux/seq_file.h>
109#include <linux/spinlock.h>
110#include <linux/io.h>
111#include <linux/uaccess.h>
112#include <linux/mutex.h>
113
114
115static DEFINE_MUTEX(nvram_mutex);
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
126static void mach_proc_infos(unsigned char *contents, struct seq_file *seq,
127                                void *offset);
128#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
137 * NVRAM_FIRST_BYTE offset. Pass them offsets into NVRAM as if you did not
138 * know about the RTC cruft.
139 */
140
141unsigned char __nvram_read_byte(int i)
142{
143    return CMOS_READ(NVRAM_FIRST_BYTE + i);
144}
145EXPORT_SYMBOL(__nvram_read_byte);
146
147unsigned char nvram_read_byte(int i)
148{
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}
157EXPORT_SYMBOL(nvram_read_byte);
158
159/* This races nicely with trying to read with checksum checking (nvram_read) */
160void __nvram_write_byte(unsigned char c, int i)
161{
162    CMOS_WRITE(c, NVRAM_FIRST_BYTE + i);
163}
164EXPORT_SYMBOL(__nvram_write_byte);
165
166void nvram_write_byte(unsigned char c, int i)
167{
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}
174EXPORT_SYMBOL(nvram_write_byte);
175
176int __nvram_check_checksum(void)
177{
178    return mach_check_checksum();
179}
180EXPORT_SYMBOL(__nvram_check_checksum);
181
182int nvram_check_checksum(void)
183{
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}
192EXPORT_SYMBOL(nvram_check_checksum);
193
194static void __nvram_set_checksum(void)
195{
196    mach_set_checksum();
197}
198
199#if 0
200void nvram_set_checksum(void)
201{
202    unsigned long flags;
203
204    spin_lock_irqsave(&rtc_lock, flags);
205    __nvram_set_checksum();
206    spin_unlock_irqrestore(&rtc_lock, flags);
207}
208#endif /* 0 */
209
210/*
211 * The are the file operation function for user access to /dev/nvram
212 */
213
214static loff_t nvram_llseek(struct file *file, loff_t offset, int origin)
215{
216    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    default:
227        return -EINVAL;
228    }
229
230    return (offset >= 0) ? (file->f_pos = offset) : -EINVAL;
231}
232
233static ssize_t nvram_read(struct file *file, char __user *buf,
234                        size_t count, loff_t *ppos)
235{
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
257checksum_err:
258    spin_unlock_irq(&rtc_lock);
259    return -EIO;
260}
261
262static ssize_t nvram_write(struct file *file, const char __user *buf,
263                        size_t count, loff_t *ppos)
264{
265    unsigned char contents[NVRAM_BYTES];
266    unsigned i = *ppos;
267    unsigned char *tmp;
268
269    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))
278        return -EFAULT;
279
280    spin_lock_irq(&rtc_lock);
281
282    if (!__nvram_check_checksum())
283        goto checksum_err;
284
285    for (tmp = contents; count--; ++i, ++tmp)
286        __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
296checksum_err:
297    spin_unlock_irq(&rtc_lock);
298    return -EIO;
299}
300
301static long nvram_ioctl(struct file *file, unsigned int cmd,
302            unsigned long arg)
303{
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
313        mutex_lock(&nvram_mutex);
314        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);
321        mutex_unlock(&nvram_mutex);
322        return 0;
323
324    case NVRAM_SETCKS:
325        /* just set checksum, contents unchanged (maybe useful after
326         * checksum garbaged somehow...) */
327        if (!capable(CAP_SYS_ADMIN))
328            return -EACCES;
329
330        mutex_lock(&nvram_mutex);
331        spin_lock_irq(&rtc_lock);
332        __nvram_set_checksum();
333        spin_unlock_irq(&rtc_lock);
334        mutex_unlock(&nvram_mutex);
335        return 0;
336
337    default:
338        return -ENOTTY;
339    }
340}
341
342static int nvram_open(struct inode *inode, struct file *file)
343{
344    spin_lock(&nvram_state_lock);
345
346    if ((nvram_open_cnt && (file->f_flags & O_EXCL)) ||
347        (nvram_open_mode & NVRAM_EXCL) ||
348        ((file->f_mode & FMODE_WRITE) && (nvram_open_mode & NVRAM_WRITE))) {
349        spin_unlock(&nvram_state_lock);
350        return -EBUSY;
351    }
352
353    if (file->f_flags & O_EXCL)
354        nvram_open_mode |= NVRAM_EXCL;
355    if (file->f_mode & FMODE_WRITE)
356        nvram_open_mode |= NVRAM_WRITE;
357    nvram_open_cnt++;
358
359    spin_unlock(&nvram_state_lock);
360
361    return 0;
362}
363
364static int nvram_release(struct inode *inode, struct file *file)
365{
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;
373    if (file->f_mode & FMODE_WRITE)
374        nvram_open_mode &= ~NVRAM_WRITE;
375
376    spin_unlock(&nvram_state_lock);
377
378    return 0;
379}
380
381#ifndef CONFIG_PROC_FS
382static int nvram_add_proc_fs(void)
383{
384    return 0;
385}
386
387#else
388
389static int nvram_proc_read(struct seq_file *seq, void *offset)
390{
391    unsigned char contents[NVRAM_BYTES];
392    int i = 0;
393
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
399    mach_proc_infos(contents, seq, offset);
400
401    return 0;
402}
403
404static 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}
423
424#endif /* CONFIG_PROC_FS */
425
426static const struct file_operations nvram_fops = {
427    .owner = THIS_MODULE,
428    .llseek = nvram_llseek,
429    .read = nvram_read,
430    .write = nvram_write,
431    .unlocked_ioctl = nvram_ioctl,
432    .open = nvram_open,
433    .release = nvram_release,
434};
435
436static struct miscdevice nvram_dev = {
437    NVRAM_MINOR,
438    "nvram",
439    &nvram_fops
440};
441
442static int __init nvram_init(void)
443{
444    int ret;
445
446    /* First test whether the driver should init at all */
447    if (!CHECK_DRIVER_INIT())
448        return -ENODEV;
449
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    }
456    ret = nvram_add_proc_fs();
457    if (ret) {
458        printk(KERN_ERR "nvram: can't create /proc/driver/nvram\n");
459        goto outmisc;
460    }
461    ret = 0;
462    printk(KERN_INFO "Non-volatile memory driver v" NVRAM_VERSION "\n");
463out:
464    return ret;
465outmisc:
466    misc_deregister(&nvram_dev);
467    goto out;
468}
469
470static void __exit nvram_cleanup_module(void)
471{
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
485static int pc_check_checksum(void)
486{
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);
495    return (sum & 0xffff) == expect;
496}
497
498static void pc_set_checksum(void)
499{
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
523static void pc_proc_infos(unsigned char *nvram, struct seq_file *seq,
524                                void *offset)
525{
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
533    seq_printf(seq, "Checksum status: %svalid\n", checksum ? "" : "not ");
534
535    seq_printf(seq, "# floppies : %d\n",
536        (nvram[6] & 1) ? (nvram[6] >> 6) + 1 : 0);
537    seq_printf(seq, "Floppy 0 type : ");
538    type = nvram[2] >> 4;
539    if (type < ARRAY_SIZE(floppy_types))
540        seq_printf(seq, "%s\n", floppy_types[type]);
541    else
542        seq_printf(seq, "%d (unknown)\n", type);
543    seq_printf(seq, "Floppy 1 type : ");
544    type = nvram[2] & 0x0f;
545    if (type < ARRAY_SIZE(floppy_types))
546        seq_printf(seq, "%s\n", floppy_types[type]);
547    else
548        seq_printf(seq, "%d (unknown)\n", type);
549
550    seq_printf(seq, "HD 0 type : ");
551    type = nvram[4] >> 4;
552    if (type)
553        seq_printf(seq, "%02x\n", type == 0x0f ? nvram[11] : type);
554    else
555        seq_printf(seq, "none\n");
556
557    seq_printf(seq, "HD 1 type : ");
558    type = nvram[4] & 0x0f;
559    if (type)
560        seq_printf(seq, "%02x\n", type == 0x0f ? nvram[12] : type);
561    else
562        seq_printf(seq, "none\n");
563
564    seq_printf(seq, "HD type 48 data: %d/%d/%d C/H/S, precomp %d, lz %d\n",
565        nvram[18] | (nvram[19] << 8),
566        nvram[20], nvram[25],
567        nvram[21] | (nvram[22] << 8), nvram[23] | (nvram[24] << 8));
568    seq_printf(seq, "HD type 49 data: %d/%d/%d C/H/S, precomp %d, lz %d\n",
569        nvram[39] | (nvram[40] << 8),
570        nvram[41], nvram[46],
571        nvram[42] | (nvram[43] << 8), nvram[44] | (nvram[45] << 8));
572
573    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",
575        nvram[9] | (nvram[10] << 8), nvram[34] | (nvram[35] << 8));
576
577    seq_printf(seq, "Gfx adapter : %s\n",
578        gfx_types[(nvram[6] >> 4) & 3]);
579
580    seq_printf(seq, "FPU : %sinstalled\n",
581        (nvram[6] & 2) ? "" : "not ");
582
583    return;
584}
585#endif
586
587#endif /* MACH == PC */
588
589#if MACH == ATARI
590
591static int atari_check_checksum(void)
592{
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);
598    return (__nvram_read_byte(ATARI_CKS_LOC) == (~sum & 0xff)) &&
599        (__nvram_read_byte(ATARI_CKS_LOC + 1) == (sum & 0xff));
600}
601
602static void atari_set_checksum(void)
603{
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
653static void atari_proc_infos(unsigned char *nvram, struct seq_file *seq,
654                                void *offset)
655{
656    int checksum = nvram_check_checksum();
657    int i;
658    unsigned vmode;
659
660    seq_printf(seq, "Checksum status : %svalid\n", checksum ? "" : "not ");
661
662    seq_printf(seq, "Boot preference : ");
663    for (i = ARRAY_SIZE(boot_prefs) - 1; i >= 0; --i) {
664        if (nvram[1] == boot_prefs[i].val) {
665            seq_printf(seq, "%s\n", boot_prefs[i].name);
666            break;
667        }
668    }
669    if (i < 0)
670        seq_printf(seq, "0x%02x (undefined)\n", nvram[1]);
671
672    seq_printf(seq, "SCSI arbitration : %s\n",
673        (nvram[16] & 0x80) ? "on" : "off");
674    seq_printf(seq, "SCSI host ID : ");
675    if (nvram[16] & 0x80)
676        seq_printf(seq, "%d\n", nvram[16] & 7);
677    else
678        seq_printf(seq, "n/a\n");
679
680    /* the following entries are defined only for the Falcon */
681    if ((atari_mch_cookie >> 16) != ATARI_MCH_FALCON)
682        return;
683
684    seq_printf(seq, "OS language : ");
685    if (nvram[6] < ARRAY_SIZE(languages))
686        seq_printf(seq, "%s\n", languages[nvram[6]]);
687    else
688        seq_printf(seq, "%u (undefined)\n", nvram[6]);
689    seq_printf(seq, "Keyboard language: ");
690    if (nvram[7] < ARRAY_SIZE(languages))
691        seq_printf(seq, "%s\n", languages[nvram[7]]);
692    else
693        seq_printf(seq, "%u (undefined)\n", nvram[7]);
694    seq_printf(seq, "Date format : ");
695    seq_printf(seq, dateformat[nvram[8] & 7],
696        nvram[9] ? nvram[9] : '/', nvram[9] ? nvram[9] : '/');
697    seq_printf(seq, ", %dh clock\n", nvram[8] & 16 ? 24 : 12);
698    seq_printf(seq, "Boot delay : ");
699    if (nvram[10] == 0)
700        seq_printf(seq, "default");
701    else
702        seq_printf(seq, "%ds%s\n", nvram[10],
703            nvram[10] < 8 ? ", no memory test" : "");
704
705    vmode = (nvram[14] << 8) || nvram[15];
706    seq_printf(seq,
707        "Video mode : %s colors, %d columns, %s %s monitor\n",
708        colors[vmode & 7],
709        vmode & 8 ? 80 : 40,
710        vmode & 16 ? "VGA" : "TV", vmode & 32 ? "PAL" : "NTSC");
711    seq_printf(seq, " %soverscan, compat. mode %s%s\n",
712        vmode & 64 ? "" : "no ",
713        vmode & 128 ? "on" : "off",
714        vmode & 256 ?
715        (vmode & 16 ? ", line doubling" : ", half screen") : "");
716
717    return;
718}
719#endif
720
721#endif /* MACH == ATARI */
722
723MODULE_LICENSE("GPL");
724MODULE_ALIAS_MISCDEV(NVRAM_MINOR);
725

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